阅读说明：本技术 一种锅炉补水系统及其方法 (Boiler water replenishing system and method thereof ) 是由 杨巍巍 唐海涛 夏瑞青 高庆有 鲁浩 张炜杰 魏媛美 于 2020-03-31 设计创作，主要内容包括：本发明公开了一种锅炉补水系统及其方法,该锅炉补水系统包括：烟气补水换热装置；所述烟气补水换热装置用于利用锅炉烟气余热对补水进行加热。该锅炉补水系统有效地利用了锅炉产生的烟气余热对锅炉进行补水,从而较大程度上实现了能源的循环利用,同时减少了锅炉补水过程中加热补水造成的能源损失,也降低了锅炉产生的烟气对环境的污染。(The invention discloses a boiler water replenishing system and a method thereof, wherein the boiler water replenishing system comprises: a flue gas water supplementing and heat exchanging device; the flue gas water supplementing and heat exchanging device is used for heating water supplement by using the waste heat of the flue gas of the boiler. The boiler water replenishing system effectively utilizes the flue gas waste heat generated by the boiler to replenish water to the boiler, thereby realizing the cyclic utilization of energy to a greater extent, reducing the energy loss caused by heating and replenishing water in the boiler water replenishing process and reducing the pollution of the flue gas generated by the boiler to the environment.)

1. A boiler feedwater system, comprising: a flue gas water supplementing and heat exchanging device;

the flue gas water supplementing and heat exchanging device is used for heating water supplementing by using the flue gas waste heat of the boiler (A).

2. The boiler water replenishing system according to claim 1, wherein a flue gas inlet of the flue gas water replenishing heat exchange device is communicated with a flue gas outlet of the boiler (A), and a flue gas outlet of the flue gas water replenishing heat exchange device is communicated with a chimney (B);

the water replenishing inlet of the smoke water replenishing heat exchange device is communicated with a water replenishing water source (C), and the water replenishing outlet of the smoke water replenishing heat exchange device is communicated with the water replenishing inlet of the boiler (A).

3. The boiler water replenishing system according to claim 2, wherein the flue gas water replenishing heat exchange device comprises:

a flue gas inlet of the flue gas heat exchanger (1) is communicated with a flue gas outlet of the boiler (A), and a flue gas outlet of the flue gas heat exchanger (1) is communicated with the chimney (B);

the water-water heat exchanger (2), the medium water inlet of the water-water heat exchanger (2) is communicated with the medium water outlet of the flue gas heat exchanger (1), and the medium water outlet of the water-water heat exchanger (2) is communicated with the medium water inlet of the flue gas heat exchanger (1);

and a water supplementing inlet of the water-water heat exchanger (2) is communicated with the water supplementing water source (C), and a water supplementing outlet of the water-water heat exchanger (2) is communicated with a water supplementing inlet of the boiler (A).

4. The boiler water supplementing system according to claim 3, wherein the flue gas water supplementing heat exchange device further comprises:

and the absorption heat pump (3) is used for further enhancing the heat exchange efficiency of the smoke water replenishing heat exchange device.

5. The boiler make-up water system according to claim 4, wherein the absorption heat pump (3) is connected in series or in parallel with an intermediate water pipeline of the water-water heat exchanger (2); and/or

The absorption heat pump (3) is connected with a water replenishing pipeline of the water-water heat exchanger (2) in series or in parallel.

6. The boiler water supplementing system according to claim 4, wherein the flue gas water supplementing heat exchange device further comprises: a steam heat-supplementing pipeline (5), wherein the steam heat-supplementing pipeline (5) exchanges heat through the absorption heat pump (3);

and a steam inlet of the steam heat supplementing pipeline (5) is communicated with a steam outlet of the boiler (A), and a condensate water outlet of the steam heat supplementing pipeline (5) is communicated with a water supplementing outlet of the absorption heat pump (3).

7. The boiler water supplementing system according to claim 6, wherein the flue gas water supplementing heat exchange device further comprises: a steam turbine power generation device (6);

the steam turbine power generation device (6) is arranged on the steam concurrent heating pipeline (5), and the steam turbine power generation device (6) is communicated with the absorption heat pump (3);

the steam turbine power generation device (6) is used for generating electric energy by using high-temperature and high-pressure steam exhausted by the boiler (A).

8. The boiler feedwater system of claim 1, further comprising:

and the heater (7) is arranged at a water replenishing inlet of the boiler (A) and is used for providing partial heat for water replenishing.

9. A method for supplementing water to a boiler is characterized by comprising the following steps:

introducing high-temperature flue gas generated by the boiler (A) into the heat absorption side of the heat exchanger;

introducing the water supplement of a water supplement pipeline of the boiler (A) into the heat release side of the heat exchanger for heat exchange;

introducing the heat-exchanged water supplement into a heater (7) for supplementary heating to a preset temperature;

introducing the supplemented water subjected to supplementary heating into a deaerator (9) for deaerating;

and introducing the water supplemented after the deoxidization into a boiler (A).

Technical Field

The invention relates to the technical field of boiler heat supply, in particular to a boiler water replenishing system and a boiler water replenishing method.

Background

The steam content in the boiler exhaust smoke is high, the latent heat of condensation of the steam is high, and if the steam is directly exhausted, the heat loss of the exhaust smoke is huge. In addition, a large amount of waste heat of the boiler is directly discharged through smoke exhaust, so that not only is the waste heat not effectively utilized, but also a large amount of 'white smoke' is formed, and the waste heat is one of important reasons for generating haze.

In addition, in present power generation enterprise or heat supply enterprise, the industrial steam and the user that externally provide are congealed the water and do not retrieve, lead to the boiler to need continuously carry out a large amount of low temperature demineralized water moisturizing, and at the moisturizing in-process, in order to avoid the boiler moisturizing temperature to hang down, the serious problem of boiler afterbody heat transfer surface flue gas corrosion is led to the circumstances such as aquatic oxygen, need preheat low temperature boiler moisturizing usually, heat it to about 100 ℃ after entering oxygen-eliminating device deoxidization, let in the boiler at last, this to a great extent has caused the energy waste.

At present, enterprises for selling steam mainly include three enterprises, namely a steam supply enterprise adopting a pumping condensing type steam turbine, a steam supply enterprise adopting a back pressure type steam turbine, and a heat supply enterprise adopting a boiler to directly supply steam. The first type is generally a large-scale power plant, and can only cover steam-consuming enterprises in a certain range around the power plant, and meanwhile, the internal thermal process of the power plant is relatively perfect, so that the cascade utilization of energy is realized, and therefore, the condition that industrial steam is used for directly heating and supplementing water does not exist, and the patent cannot be applied; but the other two enterprises are small enterprises which are relatively flexible and exist in a large number in a plurality of industrial parks using steam, and the two enterprises are main application markets of the patent.

Disclosure of Invention

Objects of the invention

The invention aims to provide a boiler water replenishing system and a boiler water replenishing method, which aim to solve the problem that energy waste (waste of smoke waste heat and energy during heating and water replenishing) is large in the heat supply process of a boiler in the prior art.

(II) technical scheme

To solve the above problems, a first aspect of the present invention provides a boiler water charging system, including: a flue gas water supplementing and heat exchanging device; the flue gas water supplementing and heat exchanging device is used for heating water supplement by using the waste heat of the flue gas of the boiler.

Further, a flue gas inlet of the flue gas water supplementing and heat exchanging device is communicated with a flue gas outlet of the boiler A, and a flue gas outlet of the flue gas water supplementing and heat exchanging device is communicated with the chimney B; the water replenishing inlet of the flue gas water replenishing heat exchange device is communicated with a water replenishing water source C, and the water replenishing outlet of the flue gas water replenishing heat exchange device is communicated with the water replenishing inlet of the boiler A.

Further, flue gas moisturizing heat transfer device includes: the flue gas heat exchanger 1 is characterized in that a flue gas inlet of the flue gas heat exchanger 1 is communicated with a flue gas outlet of a boiler A, and a flue gas outlet of the flue gas heat exchanger 1 is communicated with a chimney B; the water-water heat exchanger 2 is characterized in that an intermediate water inlet of the water-water heat exchanger 2 is communicated with an intermediate water outlet of the flue gas heat exchanger 1, and an intermediate water outlet of the water-water heat exchanger 2 is communicated with an intermediate water inlet of the flue gas heat exchanger 1; and a water supplementing inlet of the water-water heat exchanger 2 is communicated with a water supplementing water source C, and a water supplementing outlet of the water-water heat exchanger 2 is communicated with a water supplementing inlet of the boiler A.

Further, flue gas moisturizing heat transfer device still includes: and the absorption heat pump 3 is used for further enhancing the heat exchange efficiency of the flue gas water supplementing heat exchange device.

Further, the absorption heat pump 3 is connected in series or in parallel with the intermediate water pipeline of the water-water heat exchanger 2; and/or the absorption heat pump 3 is connected with the water replenishing pipeline of the water-water heat exchanger 2 in series or in parallel.

Further, flue gas moisturizing heat transfer device still includes: the steam heat supplementing pipeline 5 exchanges heat through the absorption heat pump 3 by the steam heat supplementing pipeline 5; the steam inlet of the steam heat supplementing pipeline 5 is communicated with the steam outlet of the boiler A, and the condensed water outlet of the steam heat supplementing pipeline 5 is communicated with the water supplementing outlet of the absorption heat pump 3.

Further, flue gas moisturizing heat transfer device still includes: a steam turbine power generation device 6; the steam turbine power generation device 6 is arranged on the steam concurrent heating pipeline 5, and the steam turbine power generation device 6 is communicated with the absorption heat pump 3; the steam turbine power generation device 6 is used for generating electric energy by using the high-temperature and high-pressure steam discharged from the boiler a.

Further, the boiler water charging system further comprises: and the heater 7 is arranged at a water replenishing inlet of the boiler A and is used for providing partial heat for water replenishing.

The second aspect of the invention provides a boiler water replenishing method, which comprises the following steps: introducing high-temperature flue gas generated by the boiler A into the heat absorption side of the heat exchanger; introducing the water replenishing pipeline of the boiler A into the heat release side of the heat exchanger for heat exchange; introducing the heat-exchanged water supplement into a heater 7 for supplementing and heating to a preset temperature; introducing the supplemented water subjected to supplementary heating into a deaerator 9 for deaerating; and introducing the water after the deoxidization into a boiler A.

(III) advantageous effects

The technical scheme of the invention has the following beneficial technical effects:

1. the waste heat of the flue gas including the latent heat of condensation of the water vapor is recycled deeply, so that the heat loss can be greatly reduced, and the heat supply capacity of the boiler is improved;

2. the smoke generated by the boiler is purified to a certain extent, and the environmental pollution is reduced;

3. the steam condensate generated after the flue gas waste heat is recovered can be reused, so that the water consumption is reduced;

4. the energy consumption of supplementing and heating the water supplement in the water supplement process is reduced to a certain extent.

Drawings

FIG. 1 is a schematic structural diagram of a boiler water charging system provided by an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a boiler water charging system in a series configuration according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a boiler water charging system with a series-parallel structure according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a boiler water charging system with another series-parallel structure according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a boiler water replenishing system with a parallel structure according to an embodiment of the present invention.

Reference numerals:

1: a flue gas heat exchanger; 2: a water-water heat exchanger; 3: an absorption heat pump; 4: a three-way valve; 5: a steam heat-supplementing pipeline; 6: a steam turbine power plant; 7: a heater; 8: a back pressure type steam turbine; 9: a deaerator; a: a boiler; b: a chimney; c: and (5) supplementing a water source.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the drawings a schematic view of a layer structure according to an embodiment of the invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.

It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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 should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a first aspect of the embodiment of the present invention provides a boiler water replenishing system, including: a flue gas water supplementing and heat exchanging device; the flue gas water supplementing and heat exchanging device is used for heating water supplementing by utilizing the waste heat of the flue gas of the boiler A.

In some power plants for industrial steam, a boiler A generates high-pressure steam, the high-pressure steam is generated by a backpressure steam turbine 8, the steam pressure is reduced to the pressure required by the outside, and then the high-pressure steam is supplied to the outside; in the flow of directly supplying steam by using the boiler A, the backpressure steam turbine 8 is not arranged, and the boiler A directly generates steam with proper pressure and supplies the steam to the outside. Because steam condensate is not recycled, water supplement at about 25 ℃ is required to be continuously supplemented into the system, the water supplement is firstly deoxidized by a deaerator, then is heated to more than 100 ℃ by a part of industrial steam extraction, and finally enters the boiler A system. Before steam condensate of the heating deaerator enters the deaerator, the steam condensate and water are mixed and then enter the deaerator.

By the boiler water replenishing system, flue gas waste heat including water vapor condensation latent heat is effectively and deeply recycled, heat loss is greatly reduced, and the heat supply capacity of the boiler A is improved; meanwhile, the flue gas generated by the boiler A is purified to a certain extent, so that the environmental pollution is reduced; the steam condensate generated after the flue gas waste heat is recovered can be reused, so that the water consumption is reduced; the flue gas waste heat replaces partial heating of the extra heater 7, and extra energy consumption in the process of water supplement is greatly reduced when the water supplement is heated.

In some embodiments, a flue gas inlet of the flue gas water supplementing and heat exchanging device is communicated with a flue gas outlet of the boiler A, and a flue gas outlet of the flue gas water supplementing and heat exchanging device is communicated with the chimney B; the water replenishing inlet of the flue gas water replenishing heat exchange device is communicated with a water replenishing water source C, and the water replenishing outlet of the flue gas water replenishing heat exchange device is communicated with the water replenishing inlet of the boiler A. High-temperature flue gas in the boiler A is introduced into the flue gas heat exchange device, the temperature is exchanged for medium water, the medium water transfers heat to the water replenishing pipeline, and the temperature of the replenished water is raised.

In some embodiments, the flue gas of the boiler a enters the flue gas water supplementing heat exchange device for heat exchange after being desulfurized by the desulfurizing tower and/or treated by equipment such as a wet electric dust removal device.

Preferably, the boiler water replenishing system further comprises an intermediate water circulating pump arranged in the flue gas water replenishing and heat exchanging device, so that the flow of intermediate water is accelerated, and the heat exchanging capacity is improved.

Referring to fig. 1, 4 and 5, optionally, in some embodiments, the boiler water replenishing system further includes: a three-way valve 4; the inlet of the three-way valve 4 is communicated with a water supplementing water source C, the first outlet of the three-way valve 4 is communicated with the water supplementing inlet of the flue gas water supplementing heat exchange device, and the second outlet of the three-way valve 4 is communicated with the water supplementing inlet of the boiler A. Thereby, the amount and temperature of the make-up water entering the boiler a can be controlled.

Referring to fig. 1 and 2, in this embodiment, the flue gas water replenishing and heat exchanging device includes: the flue gas heat exchanger 1 is characterized in that a flue gas inlet of the flue gas heat exchanger 1 is communicated with a flue gas outlet of a boiler A, and a flue gas outlet of the flue gas heat exchanger 1 is communicated with a chimney B; the water-water heat exchanger 2 is characterized in that an intermediate water inlet of the water-water heat exchanger 2 is communicated with an intermediate water outlet of the flue gas heat exchanger 1, and an intermediate water outlet of the water-water heat exchanger 2 is communicated with an intermediate water inlet of the flue gas heat exchanger 1; and a water supplementing inlet of the water-water heat exchanger 2 is communicated with a water supplementing water source C, and a water supplementing outlet of the water-water heat exchanger 2 is communicated with a water supplementing inlet of the boiler A. The flue gas heat exchanger 1 is communicated with the boiler A and is used for exchanging heat of high-temperature flue gas generated by the boiler A; the heat absorption side of the water-water heat exchanger 2 is communicated with the heat release side of the flue gas heat exchanger 1; the heat release side of the water-water heat exchanger 2 is communicated with a water replenishing pipeline; the water supplement in the water supplement pipeline is heated by the water-water heat exchanger 2.

The water-water heat exchanger 2 can be a plate exchanger, a shell-and-tube heat exchanger or other forms of water-water heat exchangers 2; the flue gas heat exchanger 1 can be a spray type heat exchanger or a dividing wall type heat exchanger; the condensed water generated by the flue gas heat exchanger 1 is neutralized by an alkali adding device, and then can be processed to proper water quality by other water treatment devices for reuse; the flue gas heat exchanger 1 is arranged in a low-temperature flue at the tail part, the flue gas heat exchanger 1 in the wet desulphurization system is arranged behind a desulphurization tower, and the flue gas heat exchanger 1 in the dry and semi-dry system is arranged in the flue in front of a chimney B.

Referring to fig. 2, fig. 3, fig. 4 and fig. 5, in a preferred embodiment, the flue gas water replenishing heat exchanging device further includes: and the absorption heat pump 3 is used for further enhancing the heat exchange efficiency of the flue gas water supplementing heat exchange device. The absorption heat pump 3 can be a steam-driven heat pump, and can also be a heat pump with a direct-fired type heat pump, a hot water type heat pump, a flue gas type heat pump and other driving modes according to the field situation. By adopting the steam-driven absorption heat pump 3, industrial steam can directly enter the absorption heat pump 3, or can be generated by a newly-added steam turbine and cooled before entering the absorption heat pump 3.

In the present embodiment, the absorption heat pump 3 is connected in series or in parallel with the intermediate water pipe of the water-water heat exchanger 2; and/or the absorption heat pump 3 is connected with the water replenishing pipeline of the water-water heat exchanger 2 in series or in parallel.

In embodiment 1, referring to fig. 2, specifically, a heat absorption side inlet of a water-water heat exchanger 2 is communicated with a heat release side outlet of a flue gas heat exchanger 1; an inlet on the heat absorption side of the absorption heat pump 3 is communicated with an outlet on the heat absorption side of the water-water heat exchanger 2, and an outlet on the heat absorption side of the absorption heat pump 3 is communicated with an inlet on the heat release side of the flue gas heat exchanger 1; the heat release side inlet of the absorption heat pump 3 is communicated with the heat release side outlet of the water-water heat exchanger 2; the water supplement in the water supplement pipeline enters through a heat release side inlet of the water-water heat exchanger 2, exchanges heat through the water-water heat exchanger 2 and the absorption heat pump 3, and then is supplemented into the boiler A through a heat release side outlet of the absorption heat pump 3.

In embodiment 2, referring to fig. 3, the heat absorption side inlet of the water-water heat exchanger 2 and the heat absorption side inlet of the absorption heat pump 3 are respectively communicated with the heat release side outlet of the flue gas heat exchanger 1; the heat absorption side outlet of the water-water heat exchanger 2 and the heat absorption side outlet of the absorption heat pump 3 are respectively communicated with the heat release side inlet of the flue gas heat exchanger 1; the heat release side inlet of the absorption heat pump 3 is communicated with the heat release side outlet of the water-water heat exchanger 2; the water supplement in the water supplement pipeline enters through a heat release side inlet of the water-water heat exchanger 2, exchanges heat through the water-water heat exchanger 2 and the absorption heat pump 3, and then is supplemented into the boiler A through a heat release side outlet of the absorption heat pump 3.

In embodiment 3, referring to fig. 4, the heat absorption side inlet of the water-water heat exchanger 2 is communicated with the heat release side outlet of the flue gas heat exchanger 1; an inlet on the heat absorption side of the absorption heat pump 3 is communicated with an outlet on the heat absorption side of the water-water heat exchanger 2, and an outlet on the heat absorption side of the absorption heat pump 3 is communicated with an inlet on the heat release side of the flue gas heat exchanger 1; and the water in the water supplementing pipeline enters through a heat release side inlet of the water-water heat exchanger 2 and a heat release side inlet of the absorption heat pump 3 respectively, exchanges heat through the water-water heat exchanger 2 and the absorption heat pump 3 respectively, and then is supplemented into the boiler A through a heat release side outlet of the water-water heat exchanger 2 and a heat release side outlet of the absorption heat pump 3 respectively.

In embodiment 4, referring to fig. 5, the heat absorption side inlet of the water-water heat exchanger 2 and the heat absorption side inlet of the absorption heat pump 3 are respectively communicated with the heat release side outlet of the flue gas heat exchanger 1; the heat absorption side outlet of the water-water heat exchanger 2 and the heat absorption side outlet of the absorption heat pump 3 are respectively communicated with the heat release side inlet of the flue gas heat exchanger 1; and the water in the water supplementing pipeline enters through a heat release side inlet of the water-water heat exchanger 2 and a heat release side inlet of the absorption heat pump 3 respectively, exchanges heat through the water-water heat exchanger 2 and the absorption heat pump 3 respectively, and then is supplemented into the boiler A through a heat release side outlet of the water-water heat exchanger 2 and a heat release side outlet of the absorption heat pump 3 respectively.

In a specific embodiment, the flue gas moisturizing heat transfer device still includes: the steam heat supplementing pipeline 5 exchanges heat through the absorption heat pump 3 by the steam heat supplementing pipeline 5; the steam inlet of the steam heat supplementing pipeline 5 is communicated with the steam outlet of the boiler A, and the condensed water outlet of the steam heat supplementing pipeline 5 is communicated with the water supplementing outlet of the absorption heat pump 3. And a part of steam is introduced into the absorption heat pump 3 from the industrial extracted steam and is used as a high-temperature heat source to supplement part of heat of the supplemented water.

Referring to fig. 1, in some embodiments, the flue gas water replenishing and heat exchanging device further includes: a steam turbine power generation device 6; the steam turbine power generation device 6 is arranged on the steam concurrent heating pipeline 5, and the steam turbine power generation device 6 is communicated with the absorption heat pump 3; the steam turbine power generation device 6 is used for generating electric energy by using the high-temperature and high-pressure steam discharged from the boiler a. Meanwhile, the steam turbine power generation device 6 reduces the pressure of the steam of the boiler a so that the low-pressure steam is suitable for the absorption heat pump 3.

If the absorption heat pump 3 is a steam type heat pump, the industrial steam generally has a high pressure (e.g., about 0.8-1 MPa), and the steam type absorption heat pump 3 can meet the requirement (e.g., about 0.2-0.4 MPa) by using steam with a low pressure, so that the industrial steam is directly used for the absorption heat pump 3 and the energy grade is wasted. If a steam turbine power generation device 6 is installed on the steam pipeline entering the absorption heat pump 3, the steam pressure is reduced to a proper pressure while power generation is performed, so that the cascade utilization of energy sources is realized: high-pressure steam power generation and low-pressure steam drive absorption heat pump 3. The electric quantity produced by the device can be used for surfing the internet and can also be used for the power consumption of the waste heat recovery system, thereby improving the energy utilization efficiency and the economic benefit.

In this embodiment, the boiler water charging system further includes: and the heater 7 is arranged at a water replenishing inlet of the boiler A and is used for providing partial heat for water replenishing. The boiler water charging system further comprises: and the deaerator 9 is arranged on the water replenishing pipeline and used for removing oxygen in the water replenishing.

In some embodiments, the hot water is heated to about 100 ℃ prior to entering the deaerator 9, and is heated to above about 150 ℃ prior to being deaerated by the deaerator.

The second aspect of the invention provides a boiler water replenishing method, which comprises the following steps: introducing high-temperature flue gas generated by the boiler A into the heat absorption side of the heat exchanger; introducing the water replenishing pipeline of the boiler A into the heat release side of the heat exchanger for heat exchange; introducing the heat-exchanged water supplement into a heater 7 for supplementing and heating to a preset temperature; introducing the supplemented water subjected to supplementary heating into a deaerator 9 for deaerating; and introducing the water after the deoxidization into a boiler A.

The invention relates to an operation process of a boiler water replenishing system, which comprises the following steps: on one hand, a low-temperature water replenishing water source C enters a water replenishing pipeline from a three-way valve 4, water is subjected to heat exchange through a water-water heat exchanger 2 and an absorption heat pump 3 in sequence, and higher-temperature water after heat exchange enters a deaerator 9 for deaerating and then enters a boiler A through a water replenishing inlet of the boiler A; if the temperature of the water supplement after heat exchange does not reach the target temperature, a certain amount of supplementary heating is performed by the heater 7 before the oxygen removal. On the other hand, a part of steam is introduced from the industrial extraction steam to the absorption heat pump 3 as a high-temperature heat source.

A flue gas heat exchanger 1 is arranged on a low-temperature smoke exhaust flue at the tail part of the boiler A, and medium water is heated by utilizing the heat of flue gas, and meanwhile, the temperature of the flue gas is reduced, and the content of water vapor in the flue gas is reduced; the heated intermediate water is driven by the intermediate water circulating pump to sequentially pass through the water-water heat exchanger 2 and the absorption heat pump 3 to release heat, so that the heat is exchanged to supplement water for the boiler A.

In the boiler water replenishing system, the total heat for heating and replenishing water is constant, but a part of the total heat is replaced by the waste heat of the flue gas, so that the consumption of industrial extraction steam is reduced, and the effect of energy conservation is achieved; the flue gas heat exchanger 1 condenses the water vapor in the flue gas while absorbing the waste heat, and also adsorbs pollutants in the flue gas, such as SO2, NOx, dust and the like, SO that the flue gas heat exchanger also has the effect of emission reduction; the generated condensed water can be processed by the water treatment equipment and then reused, so that the water-saving effect is achieved.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.