阅读说明：本技术 一种新型智能喷淋塔和热泵含硫烟气余热回收系统 (Novel intelligence spray column and heat pump contain sulphur flue gas waste heat recovery system ) 是由 王雅然 李雪娇 刘瑞琪 杨晨燚 马骁 王祖禹 林静 吕雯馨 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种新型智能喷淋塔和热泵含硫烟气余热回收系统,包括燃气锅炉；燃气涡轮的烟气出口与第一喷淋塔的烟气入口相连通；第一喷淋塔顶部的烟气出口通过第二烟气通道,与第二喷淋塔的烟气入口相连通；第二喷淋塔的顶部,设置有开口向上的排烟烟道；第一喷淋塔,用于对燃气锅炉通过第一烟气通道排入的高温烟气进行直接喷淋操作,并将获得的余热水输出给第一压缩式热泵,以及将喷淋后降温的烟气输出给第二喷淋塔；第二喷淋塔,用于对第一喷淋塔排入的烟气进行喷淋操作,并将获得的余热水输出给第二压缩式热泵。本发明能够对燃气锅炉排出的烟气的热量进行可靠的热回收,保证换热的效率,并能够有效降低烟气的温度,充分利用烟气余热。(The invention discloses a novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system, which comprises a gas boiler; the flue gas outlet of the gas turbine is communicated with the flue gas inlet of the first spray tower; a flue gas outlet at the top of the first spray tower is communicated with a flue gas inlet of the second spray tower through a second flue gas channel; the top of the second spray tower is provided with a smoke exhaust flue with an upward opening; the first spray tower is used for directly spraying high-temperature flue gas discharged by the gas boiler through the first flue gas channel, outputting obtained waste heat water to the first compression heat pump and outputting sprayed and cooled flue gas to the second spray tower; and the second spray tower is used for spraying the flue gas discharged from the first spray tower and outputting the obtained waste heat water to the second compression heat pump. The invention can reliably recover the heat of the flue gas discharged by the gas boiler, ensure the heat exchange efficiency, effectively reduce the temperature of the flue gas and fully utilize the waste heat of the flue gas.)

1. A novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system is characterized by comprising a gas boiler (1);

the flue gas outlet on the right side of the gas turbine (1) is communicated with the flue gas inlet on the lower part of the left side of the hollow first spray tower (4) through a hollow first flue gas channel (22);

the flue gas outlet at the top of the first spray tower (4) is communicated with the flue gas inlet at the lower part of the left side of the hollow second spray tower (8) through a hollow second flue gas channel (23);

the second spray tower (8) is positioned at the upper right part of the first-stage spray tower (4);

a smoke exhaust flue (9) with an upward opening is arranged at the top of the second spray tower (8);

the first spray tower (4) is used for directly spraying high-temperature flue gas discharged from the gas boiler (1) through the first flue gas channel (22) to realize heat exchange, outputting waste hot water obtained after spraying to the first compression heat pump (21) through the first waste hot water circulating pump (16), and outputting flue gas cooled after spraying to the second spray tower (8) through the second flue gas channel (23);

the second spray tower (8) is used for spraying the flue gas discharged from the first spray tower (4) to realize heat exchange, outputting the waste hot water obtained after spraying to a second compression heat pump (20) through a second waste hot water circulating pump (11), and discharging the flue gas cooled after spraying to the outside;

the first compression heat pump (21) is communicated with a water outlet of the existing heat supply network and is used for absorbing the heat of the residual heat water output by the first residual heat water circulating pump (16), returning the cooled residual heat water to the first spray tower (4), heating the water output by the water outlet of the existing heat supply network and outputting the water to a water inlet of the gas boiler (1);

the second compression heat pump (20) is communicated with the water outlet of the existing heat supply network and is used for absorbing the heat of the residual heat water output by the second residual heat water circulating pump (11), returning the cooled residual heat water to the second spray tower (8), heating the water output by the water outlet of the existing heat supply network and outputting the water to the water inlet of the gas boiler (1);

the water outlet of the gas boiler (1) is communicated with the water inlet of the existing heat supply network through a connecting pipeline provided with a first circulating pump (101).

2. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system as claimed in claim 1, wherein for the first spray tower (4), the upper part of the inner cavity thereof is provided with first spray pipes (40) which are distributed transversely;

a plurality of spray heads are arranged at the bottom of the first spray pipe (40) at equal intervals;

a first water pan (3) is arranged at the lower part of the inner cavity of the first spray tower (4);

a water outlet in the center of the bottom of the first water pan (3) is connected with one end of a first residual heat water circulating pump (16) through a first hot water pipeline (2);

the other end of the first waste heat water circulating pump (16) is communicated with a waste heat water inlet of the first compression heat pump (21);

the waste heat water outlet of the first compression heat pump (21) is communicated with one end of the first spray pipe (40);

the waste heat water outlet and the waste heat water inlet of the first compression heat pump (21) are respectively an opening at the upper end and the lower end of a hollow first waste heat recovery pipeline;

and the first compression heat pump (21) is used for absorbing the heat of the residual heat water output by the first residual heat water circulating pump (16) and conveying the cooled residual heat water to the first spray pipe (40).

3. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 2, wherein the first compression heat pump (21) comprises a first evaporator (15), a first compressor (19), a first condenser (18) and a first expansion valve (17);

the first evaporator (15) comprises a first waste heat recovery pipeline and a first evaporator refrigerant heat exchange pipeline;

the first condenser (18) comprises a first heat supply network water return pipeline and a first condenser refrigerant heat exchange pipeline;

the waste heat water inlet of the first waste heat recovery pipeline is communicated with the other end of the first waste heat water circulating pump (16);

a waste heat water outlet of a first waste heat recovery pipeline in the first condenser (18) is communicated with one end of a first spray pipe (40);

the lower end opening of the first evaporator refrigerant heat exchange pipeline is communicated with the lower end opening of the first condenser refrigerant heat exchange pipeline through a first compressor (19);

the upper end opening of the first evaporator refrigerant heat exchange pipeline is communicated with the upper end opening of the first condenser refrigerant heat exchange pipeline through a first expansion valve (17);

the upper end of the first heat supply network water return pipeline is provided with an opening and is communicated with a water outlet of the existing heat supply network;

the lower end opening of the first heat supply network water return pipeline is communicated with a water inlet of the gas boiler (1) through a connecting pipeline provided with a second circulating pump (102).

4. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system as claimed in claim 2, wherein for the second spray tower (8), the upper part of the inner cavity thereof is provided with a second spray pipe (80) which is distributed transversely;

a plurality of spray heads are arranged at the bottom of the second spray pipe (80) at equal intervals;

a second water pan (7) is arranged at the lower part of the inner cavity of the second spray tower;

a water outlet in the center of the bottom of the second water pan (7) is connected with one end of a second residual heat water circulating pump (11) through a second hot water pipeline (6);

the other end of the second waste heat water circulating pump (11) is communicated with a waste heat water inlet of the second compression heat pump (20);

a waste heat water outlet of the second compression heat pump (20) is communicated with one end of a second spray pipe (80);

the waste heat water outlet and the waste heat water inlet of the second compression heat pump (20) are respectively an upper end opening and a lower end opening of a hollow second waste heat recovery pipeline;

and the second compression type heat pump (20) is used for absorbing the heat of the residual heat water output by the second residual heat water circulating pump (11) and conveying the cooled residual heat water to the first spraying pipe (40).

5. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 4, wherein the second compression heat pump (20) comprises a second evaporator (10), a second compressor (14), a second condenser (13) and a second expansion valve (12);

the second evaporator (10) comprises a second waste heat recovery pipeline and a second evaporator refrigerant heat exchange pipeline;

the second condenser (13) comprises a second heat supply network water return pipeline and a second condenser refrigerant heat exchange pipeline;

a waste heat water inlet of the second waste heat recovery pipeline is communicated with the other end of the second waste heat water circulating pump (11);

a waste heat water outlet of a second waste heat recovery pipeline in the second condenser (13) is communicated with one end of a second spray pipe (80);

the lower end opening of the second evaporator refrigerant heat exchange pipeline is communicated with the lower end opening of the second condenser refrigerant heat exchange pipeline through a second compressor (14);

the upper end opening of the refrigerant heat exchange pipeline of the second evaporator is communicated with the upper end opening of the refrigerant heat exchange pipeline of the second condenser through a second expansion valve (12);

the upper end of the second heat supply network water return pipeline is opened and is communicated with the water outlet of the existing heat supply network;

the lower end opening of the second heat supply network water return pipeline is communicated with a water inlet of the gas boiler (1) through a connecting pipeline provided with a second circulating pump (102).

6. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 1, wherein the flue gas exhaust duct (9) comprises a cylindrical duct section and a frustum-shaped duct section;

the cylindrical flue section is positioned right above the truncated cone-shaped flue section;

the top of the cylindrical flue section is provided with an opening, and the lower opening of the cylindrical flue section is communicated with the top opening of the truncated cone-shaped flue section;

the bottom opening of the truncated cone-shaped flue section is communicated with the top opening of the second spray tower (8).

7. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 1, wherein the first flue gas channel (22) is a linear channel distributed transversely;

the second smoke channel (23) is a channel which extends upwards vertically and then bends to the right.

8. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 7, wherein the second flue gas channel (23) is L-shaped.

9. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 4, wherein the first spray tower (4) adopts a first spray tower body (26), in particular a stainless steel body with an inner wall coated with ceramic paint;

ceramic packing is filled in a first packing area (24) arranged at the middle lower part of the inner cavity of the first spray tower (4);

the spray head of a first spray pipe (40) in the first spray tower (4) is positioned right above the first filling area (24);

a second spray tower body (27) adopted by the second spray tower (8), in particular a PP plastic tower body;

plastic packing is filled in a second packing area (25) arranged at the middle lower part of the inner cavity of the second spray tower (8);

the spray head of a second spray pipe (80) in the second spray tower (8) is positioned right above the second filling area (25).

10. The novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system of claim 9, wherein the ceramic packing in the first packing region (24) is a circular ceramic packing block in honeycomb shape;

the plastic filler of the second filler area (25) specifically comprises a plurality of mutually spaced corrugated PP filler blocks, and the PP filler blocks are mutually parallel.

Technical Field

The invention relates to the technical field of energy, environmental protection and intelligence, in particular to a novel intelligent spray tower and a heat pump sulfur-containing flue gas waste heat recovery system.

Background

At present, researchers have conducted a great deal of technical research and development in the aspects of reducing energy consumption and improving energy utilization rate. After the policy of 'changing coal into gas' (namely changing coal-fired carbon into natural gas) in China is implemented, a large number of gas heating systems appear, and the final smoke discharge problem of the gas heating systems is widely concerned by society.

To gas heating system, the high temperature of gas boiler direct emission among them contains the sulphur flue gas, can cause a large amount of heat energy to be extravagant and to the high pollution of atmospheric environment, even cause the haze. Many people propose to desulfurize the flue gas and recycle the waste heat.

At present, the main principle of heat recovery of sulfur-containing flue gas is to transfer the heat of high-temperature flue gas to a low-temperature cold source and then complete the whole heat recovery process. The commonly adopted technologies are dividing wall type heat exchange and heat pipe heat exchange technologies, the technologies are insufficient in heat recovery of high-temperature sulfur-containing flue gas, the heat exchange efficiency is low, deep recovery of heat cannot be carried out, the temperature of discharged smoke is high, and the temperature cannot be further reduced.

Disclosure of Invention

The invention aims to provide a novel intelligent spray tower and a heat pump sulfur-containing flue gas waste heat recovery system aiming at the technical defects in the prior art.

Therefore, the invention provides a novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system, which comprises a gas boiler;

the flue gas outlet on the right side of the gas turbine is communicated with a flue gas inlet on the lower part of the left side of the hollow first spray tower through a hollow first flue gas channel;

the flue gas outlet at the top of the first spray tower is communicated with a flue gas inlet at the lower part of the left side of the hollow second spray tower through a hollow second flue gas channel;

the second spray tower is positioned at the upper right part of the first-stage spray tower;

the top of the second spray tower is provided with a smoke exhaust flue with an upward opening;

the first spray tower is used for directly spraying high-temperature flue gas discharged into the gas boiler through the first flue gas channel to realize heat exchange, outputting waste hot water obtained after spraying to the first compression heat pump through the first waste hot water circulating pump, and outputting flue gas cooled after spraying to the second spray tower through the second flue gas channel;

the second spray tower is used for spraying the flue gas discharged from the first spray tower to realize heat exchange, outputting the waste hot water obtained after spraying to a second compression heat pump through a second waste hot water circulating pump, and discharging the flue gas cooled after spraying to the outside;

the first compression heat pump is communicated with a water outlet of the existing heat supply network and is used for absorbing the heat of the residual heat water output by the first residual heat water circulating pump, returning the cooled residual heat water to the first spray tower, heating the water output by the water outlet of the existing heat supply network and outputting the water to a water inlet of the gas boiler;

the second compression heat pump is communicated with the water outlet of the existing heat supply network and is used for absorbing the heat of the residual heat water output by the second residual heat water circulating pump, returning the cooled residual heat water to the second spray tower, heating the water output by the water outlet of the existing heat supply network and outputting the water to the water inlet of the gas boiler;

the water outlet of the gas boiler is communicated with the water inlet of the existing heat supply network through a connecting pipeline provided with a first circulating pump.

Preferably, for the first spray tower, the upper part of the inner cavity of the first spray tower is provided with first spray pipes which are distributed transversely;

a plurality of spray heads are arranged at the bottom of the first spray pipe at equal intervals;

a first water pan is arranged at the lower part of the inner cavity of the first spray tower;

a water outlet in the center of the bottom of the first water receiving tray is connected with one end of a first residual heat water circulating pump through a first hot water pipeline;

the other end of the first waste heat water circulating pump is communicated with a waste heat water inlet of the first compression heat pump;

the waste heat water outlet of the first compression heat pump is communicated with one end of the first spray pipe;

the waste heat water outlet and the waste heat water inlet of the first compression heat pump are respectively an upper end opening and a lower end opening of a hollow first waste heat recovery pipeline;

and the first compression heat pump is used for absorbing the heat of the residual heat water output by the first residual heat water circulating pump and conveying the cooled residual heat water to the first spraying pipe.

Preferably, the first compression heat pump comprises a first evaporator, a first compressor, a first condenser and a first expansion valve;

the first evaporator comprises a first waste heat recovery pipeline and a first evaporator refrigerant heat exchange pipeline;

the first condenser comprises a first heat supply network water return pipeline and a first condenser refrigerant heat exchange pipeline;

the waste heat water inlet of the first waste heat recovery pipeline is communicated with the other end of the first waste heat water circulating pump;

a waste heat water outlet of a first waste heat recovery pipeline in the first condenser is communicated with one end of the first spray pipe;

the lower end opening of the first evaporator refrigerant heat exchange pipeline is communicated with the lower end opening of the first condenser refrigerant heat exchange pipeline through a first compressor;

the upper end opening of the first evaporator refrigerant heat exchange pipeline is communicated with the upper end opening of the first condenser refrigerant heat exchange pipeline through a first expansion valve;

the upper end of the first heat supply network water return pipeline is provided with an opening and is communicated with a water outlet of the existing heat supply network;

the lower end opening of the first heat supply network return water pipeline is communicated with a water inlet of the gas boiler through a connecting pipeline provided with a second circulating pump.

Preferably, for the second spray tower, the upper part of the inner cavity of the second spray tower is provided with second spray pipes which are distributed transversely;

a plurality of spray heads are arranged at the bottom of the second spray pipe at equal intervals;

a second water pan is arranged at the lower part of the inner cavity of the second spray tower;

a water outlet in the center of the bottom of the second water receiving tray is connected with one end of a second residual heat water circulating pump through a second hot water pipeline;

the other end of the second waste heat water circulating pump is communicated with a waste heat water inlet of the second compression heat pump;

the waste heat water outlet of the second compression heat pump is communicated with one end of the second spray pipe;

the waste heat water outlet and the waste heat water inlet of the second compression heat pump are respectively an upper end opening and a lower end opening of a hollow second waste heat recovery pipeline;

and the second compression heat pump is used for absorbing the heat of the residual heat water output by the second residual heat water circulating pump and conveying the cooled residual heat water to the first spraying pipe.

Preferably, the second compression heat pump comprises a second evaporator, a second compressor, a second condenser and a second expansion valve;

the second evaporator comprises a second waste heat recovery pipeline and a second evaporator refrigerant heat exchange pipeline;

the second condenser comprises a second heat supply network water return pipeline and a second condenser refrigerant heat exchange pipeline;

the waste heat water inlet of the second waste heat recovery pipeline is communicated with the other end of the second waste heat water circulating pump;

a waste heat water outlet of a second waste heat recovery pipeline in the second condenser is communicated with one end of a second spray pipe;

the lower end opening of the second evaporator refrigerant heat exchange pipeline is communicated with the lower end opening of the second condenser refrigerant heat exchange pipeline through a second compressor;

the upper end opening of the second evaporator refrigerant heat exchange pipeline is communicated with the upper end opening of the second condenser refrigerant heat exchange pipeline through a second expansion valve;

the upper end of the second heat supply network water return pipeline is opened and is communicated with the water outlet of the existing heat supply network;

the lower end opening of the second heat supply network return water pipeline is communicated with a water inlet of the gas boiler through a connecting pipeline provided with a second circulating pump.

Preferably, the smoke exhaust flue comprises a cylindrical flue section and a frustum-shaped flue section;

the cylindrical flue section is positioned right above the truncated cone-shaped flue section;

the top of the cylindrical flue section is provided with an opening, and the lower opening of the cylindrical flue section is communicated with the top opening of the truncated cone-shaped flue section;

the bottom opening of the truncated cone-shaped flue section is communicated with the top opening of the second spray tower.

Preferably, the first flue gas channel is a linear channel distributed transversely;

the second flue gas channel is a channel which extends upwards vertically and then bends towards the right.

Preferably, the second flue gas channel is L-shaped.

Preferably, a first spray tower body is adopted by the first spray tower, and particularly, a stainless steel tower body with the inner wall coated with ceramic paint is adopted;

ceramic filler is filled in a first filler area arranged at the middle lower part of the inner cavity of the first spray tower;

a spray head of a first spray pipe in the first spray tower is positioned right above the first packing area;

a second spray tower body adopted by the second spray tower, in particular to a PP plastic tower body;

plastic filler is filled in a second filler area arranged at the middle lower part of the inner cavity of the second spray tower;

and a spray head of a second spray pipe in the second spray tower is positioned right above the second packing area.

Preferably, the ceramic filler in the first filler area is a circular ceramic filler block in a honeycomb shape;

the plastic filler of the second filler area specifically comprises a plurality of mutually-spaced corrugated PP filler blocks, and the PP filler blocks are mutually parallel.

Compared with the prior art, the novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system provided by the invention has the advantages that the structural design is scientific, the heat of flue gas discharged by a gas boiler can be reliably recovered, the heat exchange efficiency is ensured, the temperature of the flue gas can be effectively reduced, the waste heat of the flue gas is fully utilized, the heat pump energy efficiency value COP of a heat pump is effectively improved, and the important production practice significance is realized.

Drawings

FIG. 1 is a schematic structural diagram of a novel intelligent spray tower and a heat pump sulfur-containing flue gas waste heat recovery system provided by the invention;

FIG. 2 is a schematic structural diagram of a novel intelligent spray tower and a heat pump sulfur-containing flue gas waste heat recovery system provided by the invention;

fig. 3 is a schematic structural diagram of a two-stage series-connected flue gas condensation spray heat exchange device (including a first-stage spray tower and a second spray tower) in the novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system provided by the invention;

FIG. 4 is a schematic diagram of an RNN (recurrent neuron) timing neural network employed in the present invention;

FIG. 5 is an enlarged schematic view of a partially rectangular region in a schematic top view (i.e., a circular top view) of the ceramic packing in the first packing region;

fig. 6 is an enlarged view of a partially rectangular region in the top view (i.e., circular top view) of the plastic packing of the second packing region.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 3, the invention provides a novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system, which comprises a gas boiler 1;

a flue gas outlet on the right side of the gas turbine 1 is communicated with a flue gas inlet on the lower part of the left side of a hollow first spray tower 4 (the concrete shape is cylindrical) through a hollow first flue gas channel 22;

the flue gas outlet at the top of the first spray tower 4 is communicated with a flue gas inlet at the lower part of the left side of a hollow second spray tower 8 (the concrete shape is cylindrical) through a hollow second flue gas channel 23;

the second spray tower 8 is positioned at the upper right part of the first-stage spray tower 4;

the top of the second spray tower 8 is provided with a smoke exhaust flue 9 with an upward opening;

the first spray tower 4 is used for directly spraying high-temperature flue gas (such as high-temperature sulfur-containing flue gas) discharged from the gas boiler 1 through the first flue gas channel 22 to realize heat exchange, outputting waste hot water obtained after spraying to the first compression heat pump 21 through the first waste hot water circulating pump 16, and outputting flue gas cooled after spraying to the second spray tower 8 through the second flue gas channel 23;

the second spray tower 8 is used for performing spray operation on the flue gas discharged from the first spray tower 4 to realize heat exchange, outputting the waste heat water obtained after spraying to the second compression heat pump 20 through the second waste heat water circulating pump 11, and discharging the flue gas cooled after spraying to the outside;

a first compression heat pump 21, which is communicated with a water outlet (i.e., a water return port) of an existing heat supply network (e.g., an existing urban heat supply network, i.e., an existing urban centralized heat supply network), and is configured to absorb heat of the residual heat water output by the first residual heat water circulating pump 16, return the cooled residual heat water to the first spray tower 4 (specifically, the first spray pipe 40 therein), heat water output from the water outlet of the existing heat supply network, and output the water to a water inlet of the gas boiler 1;

the second compression heat pump 20 is communicated with a water outlet (i.e., a water return port) of the existing heat supply network, and is used for absorbing heat of the residual heat water output by the second residual heat water circulating pump 11, returning the cooled residual heat water to the second spray tower 8 (specifically, the second spray pipe 80 therein), heating water output from the water outlet of the existing heat supply network, and outputting the water to a water inlet of the gas boiler 1;

the water outlet of the gas boiler 1 is communicated with the water inlet of the existing heat supply network through a connecting pipeline provided with a first circulating pump 101.

It should be noted that, for the present invention, the high-temperature flue gas discharged from the gas boiler 1 is firstly subjected to a first spraying operation by the first spraying tower 4 (specifically, the first spraying pipe 40 therein) to perform a first heat exchange on the flue gas, then, the flue gas after temperature reduction continues to enter the second spraying tower 8, and is subjected to a second spraying operation in the second spraying tower 8 (specifically, the second spraying pipe 80 therein) to perform direct contact heat exchange between the injected water and the flue gas in the second spraying tower 8. The flue gas after the heat exchange by spraying is finally discharged outside through a smoke discharge flue 9 at the top of the second spray tower 8.

In the present invention, in a concrete implementation, a communication pipeline between the first compression heat pump 21 and the water outlet of the existing heat supply network and a communication pipeline between the second compression heat pump 20 and the water outlet of the existing heat supply network are connected in series.

In the invention, in particular, for the first spray tower 4, the upper part of the inner cavity thereof is provided with first spray pipes 40 which are transversely distributed;

a plurality of spray heads are arranged at the bottom of the first spray pipe 40 at equal intervals;

the first shower pipe 40 is used for spraying water through the spray head and performing direct contact heat exchange with the flue gas in the first shower tower 4.

A first water pan 3 is arranged at the lower part of the inner cavity of the first spray tower 4;

a water outlet in the center of the bottom of the first water pan 3 is connected with one end of a first residual heat water circulating pump 16 through a first hot water pipeline 2;

the other end of the first residual heat water circulating pump 16 is communicated with a residual heat water inlet of the first compression heat pump 21;

a residual heat water outlet of the first compression heat pump 21 is communicated with one end of the first spray pipe 40;

the waste heat water outlet and the waste heat water inlet of the first compression heat pump 21 are respectively an upper end opening and a lower end opening of a hollow first waste heat recovery pipeline (the first waste heat recovery pipeline is specifically positioned in the first evaporator 15 of the first compression heat pump 21);

the first compression heat pump 21 (specifically, the first evaporator 15 therein) is configured to absorb heat of the residual heat water output by the first residual heat water circulating pump 16, and deliver the cooled residual heat water to the first spraying pipe 40.

In a specific implementation, the first compression heat pump 21 includes a first evaporator 15, a first compressor 19, a first condenser 18 and a first expansion valve 17;

the first evaporator 15 comprises a first waste heat recovery pipeline and a first evaporator refrigerant heat exchange pipeline;

the first condenser 18 comprises a first heat supply network water return pipeline and a first condenser refrigerant heat exchange pipeline;

a waste heat water inlet of the first waste heat recovery pipeline is communicated with the other end of the first waste heat water circulating pump 16;

a waste heat water outlet of the first waste heat recovery pipeline in the first condenser 18 is communicated with one end of the first spray pipe 40;

the lower end opening of the first evaporator refrigerant heat exchange pipe is communicated with the lower end opening of the first condenser refrigerant heat exchange pipe through a first compressor 19;

the upper end opening of the first evaporator refrigerant heat exchange pipeline is communicated with the upper end opening of the first condenser refrigerant heat exchange pipeline through a first expansion valve 17;

the upper end of the first heat supply network water return pipeline is opened and is communicated with a water outlet (namely a water return port) of the existing heat supply network;

the lower end opening of the first heat supply network return water pipe is communicated with the water inlet of the gas boiler 1 through a connecting pipe provided with a second circulating pump 102.

In the invention, in particular, for the second spray tower 8, the upper part of the inner cavity thereof is provided with second spray pipes 80 which are distributed transversely;

a plurality of spray heads are arranged at the bottom of the second spray pipe 80 at equal intervals;

the second spray pipe 80 is used for spraying water through the spray head and performing direct contact heat exchange with the flue gas in the second spray tower 8.

A second water pan 7 is arranged at the lower part of the inner cavity of the second spray tower;

a water outlet in the center of the bottom of the second water pan 7 is connected with one end of a second residual heat water circulating pump 11 through a second hot water pipeline 6;

the other end of the second waste heat water circulating pump 11 is communicated with a waste heat water inlet of the second compression heat pump 20;

a waste heat water outlet of the second compression heat pump 20 is communicated with one end of the second spray pipe 80;

the waste heat water outlet and the waste heat water inlet of the second compression heat pump 20 are respectively an upper end and a lower end of a hollow second waste heat recovery pipeline (the second waste heat recovery pipeline is specifically positioned in the second evaporator 10 of the second compression heat pump 20);

and a second compression heat pump 20 (specifically, the second evaporator 10 therein) for absorbing heat of the residual heat water output by the second residual heat water circulating pump 11 and delivering the cooled residual heat water to the first spraying pipe 40.

In a specific implementation, the second compression heat pump 20 includes a second evaporator 10, a second compressor 14, a second condenser 13 and a second expansion valve 12;

the second evaporator 10 comprises a second waste heat recovery pipeline and a second evaporator refrigerant heat exchange pipeline;

the second condenser 13 comprises a second heat supply network water return pipeline and a second condenser refrigerant heat exchange pipeline;

a waste heat water inlet of the second waste heat recovery pipeline is communicated with the other end of the second waste heat water circulating pump 11;

a waste heat water outlet of a second waste heat recovery pipeline in the second condenser 13 is communicated with one end of a second spray pipe 80;

the lower end opening of the second evaporator refrigerant heat exchange pipe is communicated with the lower end opening of the second condenser refrigerant heat exchange pipe through a second compressor 14;

the upper end opening of the second evaporator refrigerant heat exchange pipe is communicated with the upper end opening of the second condenser refrigerant heat exchange pipe through a second expansion valve 12.

The upper end of the second heat supply network water return pipeline is opened and is communicated with a water outlet (namely a water return port) of the existing heat supply network;

the lower end opening of the second heat supply network return water pipe is communicated with the water inlet of the gas boiler 1 through a connecting pipe provided with a second circulating pump 102.

It should be noted that the upper end opening of the second heat supply network water return pipe is communicated with the water outlet (i.e. water return port) of the existing heat supply network through a connecting pipe provided with a switch valve 103.

It should be noted that, for the first compression heat pump 21, the refrigerant in the first evaporator refrigerant heat exchange pipeline of the first evaporator 15 can absorb heat of the residual heat water flowing in the first residual heat recovery pipeline of the first evaporator 15, then the liquid refrigerant is changed into a gaseous refrigerant, and then the mechanical work is performed by the first compressor 19, so that the temperature and pressure rise is performed to change into a high-temperature and high-pressure gaseous refrigerant, and then the high-temperature and high-pressure gaseous refrigerant flows into the first condenser refrigerant heat exchange pipeline of the first condenser 18, the high-temperature and high-pressure gaseous refrigerant can release heat to heat the water in the first heat supply network water return pipeline of the first condenser 18, and the water in the first heat supply network water return pipeline is heated (i.e., after the temperature of the heat supply network water return is raised) and then is conveyed to the gas boiler 1.

Similarly, for the second compression heat pump 20, the refrigerant in the second evaporator refrigerant heat exchange pipeline that the second evaporator 10 has can absorb the heat of the waste heat water flowing into the second waste heat recovery pipeline in the second evaporator 10, then the liquid refrigerant becomes a gaseous refrigerant, and then the mechanical work is performed by the second compressor 14, so that the temperature and pressure rise and the pressure rise become a high-temperature and high-pressure gaseous refrigerant, and then the high-temperature and high-pressure gaseous refrigerant flows into the second condenser refrigerant heat exchange pipeline of the second condenser 13, the high-temperature and high-pressure gaseous refrigerant can release heat to heat the water in the second heat supply network water return pipeline in the second condenser 13, and the water in the second heat supply network water return pipeline is heated and heated (i.e. after the heat supply network water returns to the temperature rise) and then is conveyed to the gas-fired boiler 1.

The heat quantity released by the high-temperature and high-pressure refrigerant in the condenser is absorbed by the return water of the heat supply network, so that the temperature is increased, the return water temperature of the return water to the gas boiler is increased, the energy is saved, and the waste heat quantity is fully utilized.

Therefore, according to the present invention, first, the first compression heat pump 21 and the first spray tower 4 are used to realize the waste heat utilization of the high temperature flue gas discharged from the gas boiler 1, and then the second compression heat pump 20 and the second spray tower 8 are continuously used to continuously utilize the waste heat of the cooled flue gas discharged from the first spray tower 4.

In the invention, for each compression heat pump (the first compression heat pump 21 and the second compression heat pump 20), the refrigerant can absorb the waste heat of the flue gas in the evaporator, then the liquid refrigerant is changed into the gaseous refrigerant, the corresponding compressor performs mechanical work, the refrigerant can be heated and boosted into the high-temperature high-pressure gaseous refrigerant, then the high-temperature high-pressure gaseous refrigerant flows into the corresponding condenser to exchange heat with the water flowing out of the low-temperature heat pump waste heat water circulation loop (namely, the second heat supply network water return pipeline), the refrigerant releases heat, the high-temperature high-pressure liquid refrigerant is changed into the low-temperature low-pressure refrigerant again through the expansion valve, the low-temperature low-pressure refrigerant is returned and conveyed to the evaporator, and the circulation is continued in the way.

In the present invention, the smoke exhaust duct 9 includes a cylindrical duct section and a truncated cone-shaped duct section.

The cylindrical flue section is positioned right above the truncated cone-shaped flue section;

the top of the cylindrical flue section is provided with an opening, and the lower opening of the cylindrical flue section is communicated with the top opening of the truncated cone-shaped flue section;

the bottom opening of the truncated cone shaped flue section is communicated with the top opening of the second spray tower 8.

In the present invention, in a specific implementation, the first flue gas channel 22 is a linear channel which is distributed transversely;

the second flue gas channel 23 is a channel which extends vertically upward and then bends rightward.

In a specific implementation, the second flue gas channel 23 is L-shaped.

The system comprises a two-stage series-connection type flue gas condensation and spray heat exchange device, a high-temperature heat pump waste heat water circulation loop and a low-temperature heat pump waste heat water circulation loop;

the two-stage series connection type flue gas condensation spraying heat exchange device comprises a first spray tower and a second spray tower;

the first spray tower and the second spray tower are respectively a heat exchange section for high-temperature flue gas and a heat exchange section for low-temperature flue gas, namely the first spray tower and the second spray tower are respectively used as a high-temperature heat exchange section and a low-temperature heat exchange section;

the high-temperature heat pump residual heat water circulation loop comprises a first compression heat pump 21 and a pipeline connected with the first compression heat pump;

the low-temperature heat pump residual heat water circulation loop comprises a second compression heat pump 20 and a pipeline connected with the second compression heat pump.

Specifically, for the first spray tower and the second spray tower, the flue gas and the spray water are directly contacted in the spray tower filler and are in a counter-current state (namely, the flow direction of the flue gas and the flow direction of the spray water are opposite, the flue gas is upward, and the spray water is downward, namely, the counter-current state), wherein the spray tower (namely, the first spray tower 4) of the high-temperature heat exchange section adopts a first spray tower body 26, specifically adopts a stainless steel tower body with the inner wall coated with ceramic paint, and the ceramic filler is filled in a first filler area 24 arranged at the middle lower part of the inner cavity of the first spray tower 4;

the ceramic filler in the first filler area 24 can be a honeycomb-shaped circular ceramic filler block, so that the heat exchange efficiency and the recovery rate of the flue gas waste heat are improved;

wherein, the spray head of the first spray pipe 40 in the first spray tower 4 is positioned right above the first filling area 24;

a spray tower (namely a second spray tower 8) of the low-temperature heat exchange section adopts a second spray tower body 27, in particular a PP (polypropylene) plastic tower body, and a second filler area 25 arranged at the middle lower part of the inner cavity of the second spray tower 8 is filled with plastic (such as high-temperature-resistant PP plastic) filler; the plastic filler can be placed in a wave shape (namely, the plastic filler is placed in a wave shape, a preset gap is reserved between adjacent wave shapes, a plurality of wave shapes are parallel to each other, and the wave shape generally comprises at least one S shape), so that the heat exchange efficiency and the recovery rate of the flue gas waste heat are improved, and meanwhile, the corrosion problem is avoided;

wherein, the spray head of the second spray pipe 80 in the second spray tower 8 is positioned right above the second packing area 25.

In the present invention, specifically, the ceramic filler in the first filler zone 24 is a honeycomb-shaped circular ceramic filler block (for example, as shown in fig. 5), wherein the mesh pores (i.e., honeycomb pores) are mainly triangular, the overall size is determined by the size of the inner cavity of the spray tower (for example, the overall circular diameter of the circular ceramic filler block is slightly smaller than the inner cavity diameter of the first spray tower 4), the specific material may be aluminum porcelain, cordierite, mullite, or the like, the thermal conductivity is 1.2-2.0 (W/m · K), the thermal shock resistance temperature is greater than or equal to 300 ℃, and the bulk density is 0.6-0.8 (g/cm · K)³)。

In the present invention, in a specific implementation, the plastic filler in the second filler region 25 may specifically include a plurality of spaced-apart corrugated (e.g., S-shaped) PP (polypropylene) filler blocks, which are resistant to high temperature, because the polypropylene has good water and gas distribution properties, and is resistant to corrosion by acid, alkali, salt solution and various organic solvents at a temperature below 80 ℃. The thermal conductivity coefficient is 0.21-0.26W/m.K, and the thermal shock resistance temperature is 120 ℃. The plastic packing is placed in a wave shape, a preset gap is reserved between adjacent wave shapes, a plurality of wave-shaped PP (polypropylene) packing blocks are parallel to each other, the wave shape is S-shaped, as shown in figure 6, the large void ratio is 0.93-0.985, and the specific size can be selected according to the actual condition of the tower.

In the present invention, in a specific implementation, a first filler region 24 filled with ceramic filler and a second filler region 25 filled with plastic filler are respectively provided with a circular filler support grid (of course, other support frames with through holes are also available), and a honeycomb-shaped circular ceramic filler block or a plurality of mutually spaced PP (polypropylene) filler blocks with a waveform (such as S-shape) are placed on the filler support grid.

It should be noted that, the first filler region 24 is filled with the ceramic filler and the second filler region 25 is filled with the plastic filler, because the ceramic filler is characterized by high temperature resistance and corrosion resistance, but the cost is high; the plastic filler has good corrosion resistance, can be used for a long time, but cannot resist high temperature (the temperature t is less than 60-100 ℃). In the spray tower, the introduced flue gas neutralized by adding alkali still has a small amount of acid-base corrosivity, and in order to save cost and ensure normal and efficient operation, the temperature in the first spray tower is higher, and ceramic filler is selected; the temperature of the second spray tower is relatively low, the endurable temperature of the plastic can be borne, and the cost is low.

In a specific implementation, and with reference to fig. 6, the plastic packing consists of a plurality of corrugated sheets (i.e., corrugated PP packing blocks) inclined at 45 "(or 60 °) to the horizontal, with the corrugations of adjacent sheets being inclined in opposite directions. The structure has good cooling effect and small resistance, strengthens the heat and mass exchange between the flue gas and the cooling water, and has even gas and liquid distribution because of the regular airflow channel, thereby being beneficial to improving the heat exchange efficiency and the recovery rate of the flue gas waste heat. Referring to fig. 5, the honeycomb ceramic filler has the same structure, good cooling effect and small resistance, and is also favorable for strengthening the heat and mass exchange between the flue gas and the cooling water.

It should be noted that, for the invention, the filler is added in the spray tower to increase the heat exchange area between the flue gas and the spray water, reduce the height of the spray tower, strengthen the heat and mass exchange between the flue gas and the cooling water, and realize the waste heat recovery effect of the spray tower with the height of several meters in the limited space. The temperature of high-temperature flue gas discharged by a gas boiler can be reduced to about 30 ℃ through the secondary spray tower consisting of the first spray tower and the second spray tower and the corresponding heat pump circulating water loop, the waste heat of the flue gas is fully utilized, meanwhile, the waste heat in the flue gas is recovered in two stages, the power of each part of heat pump is reduced, the requirement and the investment on the heat pump are reduced, and meanwhile, the heat pump energy efficiency value COP of the heat pump is improved.

In some embodiments, high-temperature flue gas enters a first spray tower to perform direct contact type heat exchange with spray water in the first spray tower, part of the flue gas generates sulfuric acid-containing condensate water, the sulfuric acid-containing condensate water is mixed with an alkaline neutralizer in a first water pan through a stirring device, the pH value is increased to a certain pH value and then continuously participates in residual heat water circulation, the residual heat water is subjected to heat exchange and cooling through an acid-alkali-resistant first evaporator, and the generated cooling water participates in spray circulation of the spray tower again; and part of the flue gas enters a second spray tower after primary spraying, and the spraying and heat exchange processes are carried out again.

In the invention, a high-temperature heat pump waste heat water circulation loop is formed by the first spray tower 4 and the first compression heat pump 21, which specifically comprises the following steps: for high-temperature flue gas discharged by the gas boiler 1, in the first spray tower 4, after heat exchange is performed through direct contact type spray of flue gas and water, water absorbs heat and becomes high in temperature, the water is connected with the first evaporator 15 in the first compression heat pump 21 through the water outlet to form a residual heat water circulation, the refrigerant in the first evaporator 15 absorbs heat transferred by water, the heat is evaporated into a gaseous state, the gaseous refrigerant is heated and pressurized by using the first compressor 19 to flow into the first condenser, the gaseous refrigerant exchanges heat with water flowing out of a low-temperature heat pump residual heat water circulation loop (namely, a second heat network water return pipeline), the heat emitted by the refrigerant is changed into a liquid state and then enters the first expansion valve, and the refrigerant is cooled and depressurized and changed into a low-temperature and low-pressure refrigerant again. Similarly, for the low-temperature heat pump waste heat water circulation circuit constituted by the second spray tower 8 and the second compression heat pump 20 together, the low-temperature heat pump waste heat water circulation circuit is subjected to the same processing. Therefore, according to the invention, the temperature of the backwater absorbed heat of the heat supply network is increased through the circulation of the low-temperature part and the high-temperature part.

In the present invention, in a specific implementation, a sensor test point C2 is provided at the inner side of the bottom of the first flue gas duct 22;

sensor test points C11 and C12 are respectively arranged on the inner sides of the upper parts of the first spray tower 4 and the second spray tower 8;

a sensor test point C31 is arranged on a connecting pipeline (namely a spraying liquid pipeline) of a waste heat water outlet of a first waste heat recovery pipeline in the first condenser 18 and the first spraying pipe 40;

a sensor test point C32 is arranged on a connecting pipeline (i.e., another spray liquid pipeline) between a waste heat water outlet of a second waste heat recovery pipeline in the second condenser 13 and the second spray pipe 80;

a sensor test point C41 is arranged on the first water pan 3;

a sensor test point C42 is arranged on the second water pan 7;

the above sensor test points are all installation test points of the graphene gas sensor and are used for measuring gas (such as SO)₂) The concentration of (c).

In particular, the graphene gas sensor is an existing graphene gas sensor, and can adopt a GPro 500 Tunable Diode Laser (TDL) gas analyzer manufactured by mettler-toledo international trade (shanghai) limited to detect gas components at an air inlet pipeline.

In the present invention, graphene-based gas sensors are used to detect feed gas composition, such as SO, in real time₂、NO₂And (3) analyzing the components of the pollutants in the gas according to the gas fraction of the acid gas, and using the analyzed components as one of the input quantities of a subsequent RNN model to establish a subsequent alkali liquor addition-neutralization solution PH prediction model. The gas component fluctuation detection method has the advantages of higher detection speed for the fluctuation of the gas component, low detection result hysteresis, higher analysis precision and more convenient installation.

In particular, the first water pan 3 and the second water pan 7 may be provided with an existing stirring device (stirrer).

In particular, the width of the first water pan 3 and the second water pan 7 is about two to three meters, and the depth thereof is about two meters, so as to receive and neutralize the sulfuric acid-containing condensed water after being sprayed and heat-exchanged with the flue gas. The acidic condensate is neutralized by adding a quantity of an alkaline neutralizing agent (e.g., an alkaline solution such as sodium hydroxide) to the tray. Namely, the acidic absorption liquid is neutralized by an alkaline substance.

In the concrete implementation, a pH sensor measuring point is also arranged at the smoke exhaust flue 9 at the top of the second spray tower 8. According to the invention, the pH value of the neutralized solution can be measured, and the addition amount of the alkaline neutralizing agent can be monitored in real time and flexibly adjusted by further utilizing a computer to build a model. Through the data of gathering the sensor, establish the model according to the data of gathering in real time simultaneously, can further intelligent control the flow of neutralization liquid for PH keeps stable, realizes the high-efficient heat recovery to the flue gas on the whole, and the while is high-efficient to neutralize acidic material.

In particular, the first water pan 3 and the second water pan 7 are filled with an alkaline neutralizer, and are provided with a pH sensor and a stirring system; the alkaline neutralizing agent can be alkaline solutions such as sodium hydroxide, and the sulfur dioxide SO in the flue gas inlet (namely the first flue gas pipeline 22) of the first spray tower 4 can be measured through the graphene gas sensor (for example, the graphene gas sensor is arranged at a sensor test point C2)₂The concentration of (c). Meanwhile, the flue gas flow at the outlet of the first flue gas pipeline 22 can be measured, and meanwhile, the flow of the alkaline neutralizer added into the water receiving disc is measured at sensor test points C41 and C42; the flow rate of the absorption liquid (i.e. the spray liquid) is measured at the spray liquid pipeline, and particularly, the flow rates of the spray liquid which is mixed with the alkaline neutralizing liquid and then returns to the spray heads of the first spray pipe and the second spray pipe after the water (including the sprayed cooling water and the sprayed condensed water) sprayed by the spray heads of the first spray pipe and the second spray pipe is detected at the sensor test points C31 and C32 in real time, and the quantities are used as input data a.

Meanwhile, the PH value of the neutralized solution is detected and used as a system prediction value B, at this time, the existing RNN time sequence neural network model can be further utilized to model variables, and the neural network prediction model I is established through a large amount of existing data, so that the system can be used according to the previous momentsThe method is used for predicting the data at the next moment, then the addition amount of the alkali liquor is further regulated and controlled according to the predicted pH value change, and the accurate prediction and control of the pH value of the neutralized solution are realized through the algorithm. RNN sequential neural network schematic diagram, as shown in FIG. 4, x_tIs the input signal at the present moment, h_tIs the current time state, h_t-1Is the previous time state. The RNN time-series neural network has a delayer part, can input historical data into a model as part of training data, and can predict according to a series of continuous data in time, and the previous time and the later time are related to predict together. Therefore, the invention can further regulate and control the flow of the alkaline neutralizing liquid through intelligent regulation and control of the alkaline neutralizing system, thereby reducing the corrosion problem of the alkaline neutralizing agent.

Compared with the prior art, the novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system provided by the invention have the following beneficial effects:

1. according to the invention, the filler is added in the spray tower, so that the heat exchange area between the flue gas and the spray water is increased, and the heat exchange efficiency is improved;

2. the invention adopts a sectional two-stage spray tower, thereby improving the recovery rate of the waste heat of the flue gas.

3. The invention can reduce the temperature of the flue gas to about 30 ℃ through the secondary spray tower and the corresponding heat pump circulating water loop, fully utilizes the waste heat of the flue gas, simultaneously recovers the waste heat in the flue gas in two stages, reduces the power of each part of heat pump, reduces the requirement and investment on the heat pump, and simultaneously improves the COP value of the heat pump.

4. The invention can also make the cooling water and the condensed water sprayed out fully mix with the alkaline neutralizer through the stirring device arranged in the water pan (the existing stirrer can be adopted), the pH value rises, and then the residual heat water circulation is carried out, the corrosion to the evaporator and the pipeline is prevented, and the service life of the product is prolonged; through multistage neutralization, effectively improve the neutralization efficiency of spray column.

5. The invention can further carry out intelligent control, can accurately predict the chemical environment in the absorption tower (namely the spray tower) at the future moment according to the accumulated data, and then carry out adjustment in time, so that the adjustment effect in the tower is more optimized.

Compared with the prior art, the novel intelligent spray tower and heat pump sulfur-containing flue gas waste heat recovery system provided by the invention has the advantages that the structural design is scientific, the heat of flue gas discharged by a gas boiler can be reliably recovered, the heat exchange efficiency is ensured, the temperature of the flue gas can be effectively reduced, the waste heat of the flue gas is fully utilized, the heat pump energy value COP of a heat pump is effectively improved, and the important production practice significance is realized.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.