阅读说明：本技术 一种热电厂用锅炉蒸发装置 (Boiler evaporation plant for thermal power plant ) 是由 马金波 王永宏 郝雨光 宋强 于 2020-06-16 设计创作，主要内容包括：本发明涉及电站锅炉发电领域,具体为一种热电厂用锅炉蒸发装置,包括汽包、下降管、下联箱、上升管管簇和上联箱,下降管上设有循环过滤管路,循环过滤管路包括过滤管和备用过滤管,过滤管上还连接有管路切换组件,汽包通过下降管连接下联箱,下联箱和上联箱之间连接上升管管簇,上联箱上连接有多根蒸汽管,上联箱通过蒸汽管与汽包连接；通过设置循环过滤管路可对下降管内的水进行过滤,减少水中的杂质,使其在上升管管簇内蒸发时产生的杂质减少；同时通过设置管路切换组件连接过滤管和备用过滤管,可使过滤器在堵塞后,由管路前切换组件自动连通下降管和备用过滤管,从而保证过滤蒸发器的正常运行,同时工作人员可对过滤器进行清理或替换。(The invention relates to the field of power generation of power station boilers, in particular to a boiler evaporation device for a thermal power plant, which comprises a steam drum, a downcomer, a lower header, an ascending pipe tube cluster and an upper header, wherein a circulating filtering pipeline is arranged on the downcomer and comprises a filtering pipe and a standby filtering pipe, the filtering pipe is also connected with a pipeline switching assembly, the steam drum is connected with the lower header through the downcomer, the ascending pipe tube cluster is connected between the lower header and the upper header, the upper header is connected with a plurality of steam pipes, and the upper header is connected with the steam drum through the steam pipes; the water in the descending pipe can be filtered by arranging the circulating filter pipeline, so that impurities in the water are reduced, and the impurities generated when the water is evaporated in the ascending pipe cluster are reduced; meanwhile, the filter pipe and the standby filter pipe are connected through the pipeline switching assembly, so that the filter can be automatically communicated with the descending pipe and the standby filter pipe through the pipeline front switching assembly after being blocked, the normal operation of the filtering evaporator is guaranteed, and meanwhile, the filter can be cleaned or replaced by workers.)

1. The utility model provides a boiler evaporation plant for thermal power plant, includes steam drum (1), downcomer (2), lower header (3), tedge tube cluster (4) and upper header (5), its characterized in that, be equipped with the loop filter pipeline on downcomer (2), the loop filter pipeline includes filter tube (7) and reserve filter tube (8), still be connected with the pipeline on filter tube (7) and switch over the subassembly, steam drum (1) is through downcomer (2) connection lower header (3), tedge tube cluster (4) are connected to between lower header (3) and upper header (5), be connected with many steam pipes (6) on upper header (5), upper header (5) are connected with steam drum (1) through steam pipe (6).

2. The boiler evaporation plant for thermal power plants according to claim 1, characterized in that said filtering pipe (7) is connected to the downcomer (2), one end of said spare filtering pipe (8) is connected to an electric three-way valve (9), said electric three-way valve (9) is also connected to the downcomer (2) and the filtering pipe (7), the other end of said spare filtering pipe (8) is connected to the water outlet of the filtering pipe (7); the filter pipe (7) is connected with a filter (10), and the standby filter pipe (8) is connected with a standby filter (11).

3. The evaporation plant for boilers of thermal power plants according to claim 2, the pipeline switching assembly comprises a branch pipe (12) and a travel switch (13), the branch pipe (12) is obliquely connected to the filtering pipe (7), the branch pipe (12) is positioned at one side of the water outlet of the filter (10), one end of the branch pipe (12) is fixedly connected with a plug (27), a sliding rod (14) is connected on the plug (27) in a sliding way, one end of the sliding rod (14) is fixedly connected with a push plate (15), the push plate (15) is connected in the branch pipe (12) in a sliding way, the other end of the slide rod (14) is fixedly connected with a pressure plate (16), the pressure plate (16) corresponds to the travel switch (13), one side of the pressure plate (16) is connected with a limit adjusting component, the sliding rod (14) is sleeved with a pressure spring (17), and the pressure spring (17) is located between the plug (27) and the push plate (15).

4. The boiler evaporation device for thermal power plants according to claim 3, wherein the pushing plate (15) is a circular plate, a sealing rubber ring is fixedly connected to the surface of the outer peripheral wall of the pushing plate (15), and a sealing rubber ring is also fixedly connected to the inner peripheral wall of the hole part of the surface connection sliding rod (14) of the plug (27).

5. The boiler evaporation device for the thermal power plant according to claim 3, wherein the limit adjusting assembly comprises a fixed seat (18), the fixed seat (18) is fixedly connected to the lower end of the outer wall of the branch pipe (12), a screw rod (19) is connected to the fixed seat (18) in a threaded manner, one end of the screw rod (19) is fixedly connected with a rocking handle (20), and the other end of the screw rod (19) is fixedly connected with a limit block (21).

6. The boiler evaporation plant for thermal power plants according to claim 3, characterized in that a check valve (22) is connected to the outlet of the spare filter pipe (8), and the travel switch (13) is fixedly connected to the check valve (22).

7. A boiler evaporation plant for thermal power plants according to claim 3, characterized in that said travel switch (13) is electrically connected to an electric three-way valve (9).

8. The boiler evaporation plant for thermal power plants according to claim 2, characterized in that a booster pump (23) is connected to the upper part of the downcomer (2), the booster pump (23) is located above the circulating filtration pipeline, and the water outlet of the booster pump (23) corresponds to the water inlet of the electric three-way valve (9).

9. The boiler evaporation device for the thermal power plant according to claim 1, wherein a steam outlet (24) and a water inlet pipe (25) are connected to the steam drum (1), a plurality of steam-water separators are further arranged in the steam drum (1), and the plurality of steam-water separators are connected with the steam pipes (6) in a one-to-one correspondence manner.

10. The evaporation device of the boiler for the thermal power plant according to the claims 1 to 9, characterized by comprising the following implementation methods:

firstly, water is injected into a steam pocket (1) through a water inlet pipe (25) until an ascending pipe cluster (4) and a descending pipe (2) are filled, and the water temperature is controlled to be close to the middle part of the steam pocket;

when high-temperature fuel gas passes through the outside of the ascending pipe cluster (4), water in the ascending pipe cluster (4) is heated into a steam-water mixture, the steam-water mixture in the ascending pipe cluster (4) and the water in the descending pipe (2) have a stroke pressure difference in the lower header (3), and the steam-water mixture in the ascending pipe cluster (4) is pushed to enter the steam pocket (1) through the steam pipe (6);

thirdly, after the steam-water mixture enters the steam drum (1), the steam-water mixture is separated into saturated steam and water through a steam-water separator, the saturated steam is output through a steam outlet (24), and the separated water and the water injected by the water inlet pipe (25) enter the downcomer (2) together;

fourthly, the water entering the downcomer (2) is pumped to the circulating filtration pipeline by a booster pump (23);

when the filter (10) normally operates, water enters the filter pipe (7) through the electric three-way valve (9), and enters the lower header (3) after being filtered by the filter (10); when fluid passes through the filter pipe (7), the fluid enters the filling branch pipe (12), the fluid pushes the push plate (15) to descend, the pressure spring (17) is stressed and compressed to enable the slide rod (14) to drive the pressure plate (16) to trigger the travel switch (13), and the travel switch (13) controls the electric three-way valve (9) to enable the descending pipe (2) to be communicated with the filter pipe (7);

when the filter (10) is blocked, fluid passing through the filter (10) is reduced, the pressure in the branch pipe (12) is reduced, the pressure spring (17) resets to drive the pressure plate (16) to retract, the travel switch (13) resets to control the electric three-way valve (9) to communicate the standby filter (11) and the descending pipe (2), water enters the lower header (3) after being filtered by the standby filter (11), and a worker can clean and maintain the filter (10) at the same time.

Technical Field

The invention relates to the field of power station boiler power generation, in particular to a boiler evaporation device for a thermal power plant.

Background

The electric boiler is a thermal device which converts electric energy into heat energy and heats water to hot water or steam with pressure. It does not need furnace, flue and chimney, and also does not need the field for storing fuel, thus greatly reducing the pollution caused by the conventional coal-fired boiler. The electric boiler has the characteristics of no pollution, no noise, small occupied area, convenient installation and use, full automation, safety, reliability, high thermal efficiency of more than 98 percent and the like, and is a green and environment-friendly product. In many countries, electric boilers were developed in the late 70 s to the early 80 s of the 20 th century. In China, electric boiler products are developed in the middle of the 80 s, and by the middle of the 90 s, a large number of enterprises apply the electric boilers to heating, central air conditioning and hot water supply.

The riser tube bundle for producing saturated steam is called evaporator, and the power plant boiler also has economizer and superheater, which are all composed of tube bundles. Water entering the steam pocket is heated in the economizer and then enters the evaporator through the steam pocket and the downcomer, so that the efficiency of the evaporator and the efficiency of the boiler can be improved. Saturated steam generated by the evaporator is output through the steam drum and then enters the superheater to be heated into superheated steam, and the superheated steam is used for pushing the steam turbine to operate, so that the high efficiency and the safety of the system can be ensured.

After water in an ascending tube bundle of the filtering evaporator is evaporated, a solute of the water is changed into solid and is separated out, and a scaling layer is formed on the tube wall after long-term accumulation, so that the heat conduction efficiency is reduced, and the heat transfer efficiency is reduced; and the filter can take place to block up after carrying out long-time filtration to the water in the pipeline, when the filter blockked up, need stop the boiler operation and clear up the filter, greatly influenced production efficiency.

Disclosure of Invention

The invention aims to provide an evaporation device of a boiler for a thermal power plant, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a boiler evaporation plant for thermal power plant, includes steam pocket, downcomer, lower header, tedge tube cluster and last header, be equipped with the loop filter pipeline on the downcomer, the loop filter pipeline includes filter tube and reserve filter tube, still be connected with pipeline switching component on the filter tube, the steam pocket passes through downcomer and connects header down, the tedge tube cluster is connected to the lower header between header and the last header down, be connected with many steam pipes on the last header, it passes through the steam pipe and is connected with the steam pocket to go up the header.

Preferably, the filter pipe is connected to a down pipe, one end of the standby filter pipe is connected to an electric three-way valve, the electric three-way valve is further connected to the down pipe and the filter pipe, and the other end of the standby filter pipe is connected to a water outlet of the filter pipe; the filter pipe is connected with a filter, and the standby filter pipe is connected with a standby filter.

Preferably, the pipeline switching component includes branch pipe and travel switch, the branch pipe slope is connected in the filter tube, the branch pipe is located delivery port one side of filter, the one end fixedly connected with end cap of branch pipe, sliding connection has the slide bar on the end cap, the one end fixedly connected with push pedal of slide bar, push pedal sliding connection is in the branch pipe, the other end fixedly connected with clamp plate of slide bar, the clamp plate is corresponding with travel switch, one side of clamp plate is connected with spacing adjusting part, the cover is equipped with the pressure spring on the slide bar, the pressure spring is located between end cap and the push pedal.

Preferably, the push pedal is the circular slab, just the periphery wall fixed surface of push pedal is connected with the sealing rubber circle, the stopper surface connection slide bar's the also fixedly connected with sealing rubber circle of hole portion internal perisporium.

Preferably, the limiting adjusting assembly comprises a fixing seat, the fixing seat is fixedly connected to the lower end of the outer wall of the branch pipe, a screw rod is connected to the inner thread of the fixing seat, a rocking handle is fixedly connected to one end of the screw rod, and a limiting block is fixedly connected to the other end of the screw rod.

Preferably, the water outlet of the spare filter pipe is connected with a check valve, and the travel switch is fixedly connected to the check valve.

Preferably, the travel switch is electrically connected with the electric three-way valve.

Preferably, the upper part of the descending pipe is connected with a booster pump, the booster pump is positioned above the circulating filtration pipeline, and a water outlet of the booster pump corresponds to a water inlet of the electric three-way valve.

Preferably, the steam drum is connected with a steam outlet and a water inlet pipe, a plurality of steam-water separators are further arranged in the steam drum, and the plurality of steam-water separators are connected with the steam pipes in a one-to-one correspondence manner.

Preferably, the boiler evaporation device for the thermal power plant comprises the following implementation methods:

firstly, injecting water into the steam pocket through a water inlet pipe until an ascending pipe cluster and a descending pipe are filled, and controlling the water temperature to be close to the middle part of the steam pocket;

when high-temperature fuel gas passes through the outside of the ascending pipe bundle, water in the ascending pipe bundle is heated into a steam-water mixture, and the steam-water mixture in the ascending pipe bundle and the water in the descending pipe have a stroke pressure difference in the lower header so as to push the steam-water mixture in the ascending pipe bundle to enter a steam pocket through a steam pipe;

after the steam-water mixture enters the steam drum, the steam-water mixture is separated into saturated steam and water through a steam-water separator, the saturated steam is output through a steam outlet, and the separated water and the water injected by the water inlet pipe enter a downcomer together;

pumping water entering the descending pipe to a circulating filtering pipeline by a booster pump;

fifthly, when the filter operates normally, water enters the filter pipe through the electric three-way valve, and the water enters the lower header after being filtered by the filter; when fluid passes through the filter pipe, the fluid enters the filling branch pipe, the fluid pushes the push plate to descend, the pressure spring is stressed and compressed to enable the slide bar to drive the press plate to trigger the travel switch, and the travel switch controls the electric three-way valve to enable the descending pipe to be communicated with the filter pipe;

when the filter is blocked, the fluid passing through the filter is reduced, the pressure in the branch pipe is reduced, the pressure spring resets to drive the pressure plate to retract, the travel switch resets to control the electric three-way valve to communicate with the standby filter and the descending pipe, water enters the lower header after being filtered by the standby filter, and a worker can clean and maintain the filter at the same time.

Compared with the prior art, the invention has the beneficial effects that:

according to the boiler evaporation device for the thermal power plant, water in the descending pipe can be filtered by arranging the circulating filtering pipeline, so that impurities in the water are reduced, and the impurities generated when the water is evaporated in the ascending pipe cluster are reduced; meanwhile, the filter is connected with the standby filter pipe through the pipeline switching assembly, so that the filter can be automatically communicated with the descending pipe and the standby filter pipe through the pipeline switching assembly after being blocked, the normal operation of the filtering evaporator is guaranteed, meanwhile, a worker can clean or replace the filter, the filter is not stopped, and the production efficiency is guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a circulating filtration circuit of the present invention;

FIG. 3 is an enlarged view of part A of FIG. 2;

in the drawings, the components represented by the respective reference numerals are listed below:

the device comprises a steam drum 1, a downcomer 2, a lower header 3, an upper header 4, an upper header 5, a steam pipe 6, a filter pipe 7, a spare filter pipe 8, an electric three-way valve 9, a filter 10, a spare filter 11, a branch pipe 12, a travel switch 13, a slide rod 14, a push plate 15, a pressure plate 16, a pressure spring 17, a fixed seat 18, a screw rod 19, a rocking handle 20, a limiting block 21, a check valve 22, a booster pump 23, a steam outlet 24, a water inlet pipe 25 and a plug 26.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.

Referring to fig. 1 to 3, the present invention provides the following technical solutions: