Flue gas waste heat recovery and flue gas condensate water treatment system

Abstract

The utility model relates to the technical field of power plant energy conservation, in particular to a flue gas waste heat recovery and flue gas condensate water treatment system. Comprising a heating device, an absorption heat pump and a flue gas heat exchanger, wherein a flue gas condensed water inlet of the heating device is connected with a flue gas condensed water outlet of the flue gas heat exchanger through a pipeline; a low-pressure steam outlet of the heating device is connected with a steam inlet of the absorption heat pump through a pipeline; an intermediate water outlet of the flue gas heat exchanger is connected with an intermediate water inlet of the absorption heat pump through a pipeline, and an intermediate water outlet of the absorption heat pump is connected with an intermediate water inlet of the flue gas heat exchanger through a pipeline. According to the system provided by the utility model, integration of flue gas waste heat recovery and flue gas condensate water treatment is realized, high-pressure steam is fully utilized to do power, gradient utilization of heat is realized, the steam heat utilized in the flue gas condensate water treatment process is supplied through the absorption heat pump, the problem of high investment and operation cost of conventional water treatment is solved, and the system is suitable for industrial production. And the economical efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the energy -conserving technical field of power plant especially is related to a system of flue gas waste heat recovery and flue gas condensate water treatment. BACKGROUND

[0002] With the acceleration of industrialization, energy consumption and environmental problems gradually highlight, become the core problem of restricting enterprise sustainable development. In the industrial production process, the large amount of heat energy carried by high-temperature flue gas is directly discharged, which not only leads to great waste of energy, but also causes serious environmental pollution. In addition, if the vast amount of industrial wastewater brought by industrial development is directly discharged into the environment without treatment, it will cause irreversible damage to water resources.

[0003] In order to improve energy utilization efficiency and reduce greenhouse gas emissions, enterprises are sparing no effort to explore advanced energy-saving and emission-reducing technologies and methods. Under this background, flue gas waste heat recovery technology emerges as the times require, and becomes the key weapon to improve energy utilization efficiency and achieve energy saving and emission reduction. At the same time, wastewater zero discharge technology has also become an important way to solve the problem of industrial wastewater treatment and realize resource utilization.

[0004] Thermal power plants usually use steam heat network heaters to supply heat externally. In the heater, high-temperature steam heats hot water and supplies it out. There is a large temperature difference in the heat exchange process. Absorption heat pump can use the temperature difference of the original heat exchange process to do work, driven by the original heating heat source of the power plant, to recover flue gas waste heat without additional energy consumption. Therefore, in the flue gas waste heat recovery process of thermal power plants, it has become the mainstream.

[0005] In addition, a large amount of condensate water will be produced in the process of deep cooling of flue gas. These waters contain many impurities and cannot be directly utilized or discharged. The existing wastewater treatment system of power plants has limited capacity and cannot meet the new water treatment demand. Therefore, new water treatment systems have to be built, which greatly increases the investment cost and operating cost.

[0006] In view of the fact that the heating steam pressure of power plant is too high, and the absorption heat pump only needs low-pressure steam (greater than 0.05 MPa.g) to operate, directly using the original heating steam to drive exists the problem of high energy and low use and large exergy loss. At present, most power plants still lack reliable solutions. Some power plants try to modify the steam-driven pump, using high-pressure steam to drive the steam-driven pump first, and then using the reduced steam as the driving heat source of the heat pump. However, in the heating season, the fluctuation of flue gas heat and heat network flow is large, which makes it difficult to match the steam quantity required by steam-driven pump and absorption heat pump in real time, so that the system operation becomes complex and the reliability is reduced.

[0007] In the condensate treatment system, even if the condensate is treated to the lower standard of the heat supply network supplement water, the investment and land occupation demand of the newly added water treatment system are still significant. If a thermal treatment process such as multi-stage flash evaporation is used, although the land occupation area is small, the process consumes a large amount of high-temperature steam, resulting in high operating cost and low cost performance. However, the existing MVR treatment process replaces steam input with a small amount of power consumption through a compressor to warm and pressurize the exhaust steam, significantly reducing the operating cost. However, this process still has the problems of large land occupation area and high investment cost.

[0008] In addition, in the prior art, the flue gas waste heat recovery system and the condensate treatment system usually exist as two independent systems, which further increases the investment cost and land occupation area.

[0009] Therefore, the utility model is proposed. Utility model content

[0010] The utility model aims at providing a flue gas waste heat recovery and flue gas condensate treatment system, which can solve the problems of high-pressure steam high energy and low use and flue gas condensate treatment difficulty in the conventional flue gas waste heat recovery system, and will not increase the investment cost and land occupation area.

[0011] The utility model provides a flue gas waste heat recovery and flue gas condensate treatment system, which comprises a heating device, an absorption heat pump and a flue gas heat exchanger, a high-pressure steam inlet, a high-pressure steam condensate water outlet, a low-pressure steam outlet and a flue gas condensate water inlet are arranged on the heating device, the flue gas condensate water inlet is connected with the flue gas condensate water outlet of the flue gas heat exchanger through a pipeline, the low-pressure steam outlet of the heating device is connected with the steam inlet of the absorption heat pump through a pipeline, the intermediate water outlet of the flue gas heat exchanger is connected with the intermediate water inlet of the absorption heat pump through a pipeline, and the intermediate water outlet of the absorption heat pump is connected with the intermediate water inlet of the flue gas heat exchanger through a pipeline.

[0012] Further, the heating device is further provided with a power plant other wastewater inlet.

[0013] Further, the bottom of the heating device is provided with a high-temperature high-salt wastewater outlet, and the high-temperature high-salt wastewater outlet is connected with the absorption heat pump through a pipeline.

[0014] Further, the absorption heat pump is provided with a low-temperature high-salt wastewater outlet, and the low-temperature high-salt wastewater outlet is connected with the power plant raw water treatment system through a pipeline.

[0015] Further, the flue gas condensate water inlet on the heating device comprises a first flue gas condensate water inlet and a second flue gas condensate water inlet, the first flue gas condensate water inlet is connected with the flue gas heat exchanger through a pipeline, and the second flue gas condensate water inlet is connected with the first flue gas condensate water inlet through a circulating pipeline.

[0016] Further, the heating device comprises a primary heater and a secondary heater, the primary heater is provided with a high-pressure steam inlet and a second flue gas condensate water inlet, the secondary heater is provided with a first flue gas condensate water inlet and a flue gas condensate water outlet, and a primary low-pressure steam outlet of the primary heater is connected with a primary low-pressure steam inlet of the secondary heater through a pipeline; the primary heater and the secondary heater are respectively provided with a high-temperature high-salt wastewater outlet; and the flue gas condensate water outlet on the secondary heater is connected with the second flue gas condensate water inlet through a pipeline.

[0017] Further, the absorption heat pump is provided with a low-pressure steam condensate water outlet, and the low-pressure steam condensate water outlet is connected with a clean water recycling system through a pipeline.

[0018] Further, the absorption heat pump is provided with a heat network heating medium inlet and a heat network heating medium outlet.

[0019] Further, the absorption heat pump is further provided with an auxiliary heat source inlet and an auxiliary heat source outlet.

[0020] Further, the flue gas heat exchanger adopts a partition wall type heat exchanger or a spray type heat exchanger.

[0021] Compared with the prior art, the system has the following advantages:

[0022] The system provided by the utility model has the advantages that high-pressure steam enters the heating device to heat flue gas condensate water, the high-pressure steam is cooled and condensed, and the steam condensate water returns to the original system of the power plant for recycling; the flue gas condensate water is heated and evaporated into low-pressure steam in the heating device, and then enters the absorption heat pump to drive the working of the absorption heat pump and recycle the waste heat of flue gas; after the low-pressure steam drives the working of the heat pump, the low-pressure steam is condensed into clean water for recycling; in the heating device, the flue gas condensate water is evaporated into high-temperature high-salt wastewater, so that the amount of wastewater is greatly reduced compared with the amount of flue gas condensate water, and the original wastewater treatment system of the power plant can meet the treatment demand; the system provided by the utility model realizes the integration of flue gas waste heat recycling and flue gas condensate water treatment, fully utilizes the working capacity of high-pressure steam, realizes the cascade utilization of heat, and supplies steam heat used in the flue gas condensate water treatment process through the absorption heat pump, that is, the flue gas condensate water treatment process does not need additional energy consumption, the problem of high investment and operation cost of conventional water treatment is overcome, and the economy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 It is a structural schematic diagram of the system for flue gas waste heat recovery and flue gas condensate water treatment in the embodiment 1 of the present application.

[0025] Figure 2 It is a structural schematic diagram of the heating device in the embodiment 2 of the present application.

[0026] Figure 3 It is a structural schematic diagram of the absorption heat pump in the embodiment 3 of the present application.

[0027] Figure 4 It is a structural schematic diagram of the flue gas heat exchanger in the embodiment 4 of the present application.

[0028] Explanation of reference signs: 1-heating device; 101-high pressure steam inlet; 102-high pressure steam condensate water outlet; 103-first flue gas condensate water inlet; 104-second flue gas condensate water inlet; 105-power plant other waste water inlet; 106-high temperature and high salt waste water outlet; 107-low pressure steam outlet; 108-first stage low pressure steam inlet; 109-first stage low pressure steam condensate water outlet; 110-second stage low pressure steam outlet; 111-first stage high temperature and high salt waste water outlet; 112-second stage high temperature and high salt waste water outlet; 113-first stage low pressure steam outlet; 2-absorption heat pump; 201-steam inlet; 202-low pressure steam condensate water outlet; 203-high temperature and high salt waste water inlet; 204-low temperature and high salt waste water outlet; 205-heat network heating medium inlet; 206-heat network heating medium outlet; 207-assisted heat source inlet; 208-assisted heat source outlet; 3-flue gas heat exchanger; 301-high temperature flue gas inlet; 302-flue gas outlet; 303-flue gas condensate water outlet; 304-intermediate water outlet; 305-intermediate water inlet; 4-condensate water circulating pump; 5-intermediate water circulating pump; 6-condensate water conveying pump; 7-electric regulating valve; 8-condensate water tank; 9-first stage heater; 10-second stage heater. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Embodiment 1

[0033] A system for recovering waste heat from flue gas and treating flue gas condensate, as shown in Figure 1 The system comprises a heating device 1, an absorption heat pump 2, and a flue gas heat exchanger 3.

[0034] The heating device 1 can use a heater commonly used in the prior art in the field, and the heating device 1 is provided with a high-pressure steam inlet 101, a high-pressure steam condensate outlet 102, a low-pressure steam outlet 107, a flue gas condensate inlet, a power plant other wastewater inlet 105, and a high-temperature high-salt wastewater outlet 106; wherein the flue gas condensate inlet is divided into a first flue gas condensate inlet 103 and a second flue gas condensate inlet 104.

[0035] The absorption heat pump 2 is provided with a steam inlet 201, a low-pressure steam condensate water outlet 202, a high-temperature high-salinity wastewater inlet 203, a low-temperature high-salinity wastewater outlet 204, a heat network heating medium inlet 205, a heat network heating medium outlet 206, an intermediate water inlet, and an intermediate water outlet.

[0036] The flue gas heat exchanger 3 is a spray heat exchanger in the art, which is provided with a high-temperature flue gas inlet 301, a flue gas outlet 302, a flue gas condensate water outlet 303, an intermediate water outlet 304, and an intermediate water inlet 305.

[0037] The high-temperature steam inlet 101 of the heating device 1 is connected to a high-pressure steam pipeline through a pipeline, the first flue gas condensate water inlet 103 of the heating device 1 is connected to the flue gas condensate water outlet 303 of the flue gas heat exchanger 3 through a flue gas condensate water pipeline, and a condensate water conveying pump 6 is installed on the flue gas condensate water pipeline. The flue gas condensate water is transported into the heating device 1 by the condensate water conveying pump 6, the flue gas condensate water is heated by the high-pressure steam in the power plant, the high-pressure steam is cooled and condensed, and returns to the original system of the power plant from the high-pressure steam condensate water outlet 102 for reuse. At the same time, a condensate water circulation pipeline is arranged at the first flue gas condensate water inlet 103 at the bottom of the heating device 1, the outlet of the condensate water circulation pipeline is connected to the second flue gas condensate water inlet 104 at the upper part of the heating device 1, and a condensate water circulation pump 4 is installed on the condensate water circulation pipeline. The flue gas condensate water generated in the flue gas cooling process is introduced into the heating device 1 by the condensate water conveying pump 6, and the heat exchange process with the high-pressure steam is completed by the condensate water circulation pump 4 to generate low-pressure steam.

[0038] The low-pressure steam outlet 107 of the heating device 1 is connected to the steam inlet 201 of the absorption heat pump 2 through a pipeline, the low-pressure steam in the absorption heat pump 2 drives the heat pump to work, becomes low-pressure steam condensate water (i.e. pure water in the art) after cooling, and is discharged through the low-pressure steam condensate water outlet 202, and can be directly recycled and utilized.

[0039] The flue gas condensate is evaporated in the heating device 1 and becomes high-temperature high-salt wastewater, so the amount of wastewater is greatly reduced compared to the amount of flue gas condensate, and the original wastewater treatment system of the power plant can meet the treatment demand. In this embodiment, it is transported to the absorption heat pump 2 together with the high-temperature high-salt wastewater evaporated from the treatment of other wastewater of the power plant as a driving heat source. The heating device 1 is provided with a power plant other wastewater inlet 105 and a high-temperature high-salt wastewater outlet 106, and the high-temperature high-salt wastewater outlet 106 is connected with the high-temperature high-salt wastewater inlet 203 of the absorption heat pump 2 through a pipeline, and an electric regulating valve 7 is installed on the pipeline. The power plant other wastewater enters the heating device 1 through the power plant other wastewater inlet 105 and is heated, and after the wastewater is evaporated by heating, the remaining small amount of high-temperature high-salt wastewater and the wastewater evaporated from the flue gas condensate enters the absorption heat pump 2 through the electric regulating valve 7 as a heat pump driving heat source, and after cooling, the low-temperature high-salt wastewater enters the original wastewater treatment system of the power plant through the low-temperature high-salt wastewater outlet 204.

[0040] The high-temperature flue gas inlet 301 of the flue gas heat exchanger 3 is connected with the high-temperature flue gas pipeline through a pipeline, and the intermediate water outlet 304 and the intermediate water inlet 305 are connected with the intermediate water inlet and the intermediate water outlet of the absorption heat pump 2 through pipelines, respectively, and the intermediate water circulating pump 5 is installed on the pipeline connecting the intermediate water outlet 304 of the flue gas heat exchanger 3 with the intermediate water inlet of the absorption heat pump 2. The high-temperature flue gas enters the flue gas heat exchanger 3, is cooled by heat exchange with the intermediate water, and is discharged from the flue gas outlet 302, the intermediate water is heated by absorbing the heat of the flue gas, is transported to the absorption heat pump 2 by the intermediate water circulating pump 5, and is cooled, so as to realize the recovery of the waste heat of the flue gas, and the generated flue gas condensate is sent into the heating device 1 through the condensate delivery pump 6 through the flue gas condensate outlet 303.

[0041] The absorption heat pump 2 is provided with a heat network heating medium inlet 205 and a heat network heating medium outlet 206, and the heat of the low-pressure steam and the heat of the intermediate water (i.e. the heat of the flue gas) are used to uniformly supply the heat network heating medium for heating. The heat network heating medium inlet 205 and the heat network heating medium outlet 206 can also deliver other heating medium required for production.

[0042] The working process of the system for flue gas waste heat recovery and flue gas condensate water treatment provided by the embodiment is as follows: high-temperature flue gas enters the inside of the flue gas heat exchanger 3, heats the intermediate water, and is discharged as low-temperature flue gas after being cooled, the generated flue gas condensate water is sent into the inside of the heating device 1 by the condensate water conveying pump 6, high-pressure steam enters the inside of the heating device 1, heats the flue gas condensate water, the high-pressure steam is cooled and condensed, and the high-pressure steam condensate water returns to the original system of the power plant for reuse; the flue gas condensate water is heated and evaporated to generate low-pressure steam, the low-pressure steam enters the absorption heat pump 2 to drive the heat pump to work, the low-pressure steam is cooled and condensed into low-pressure steam condensate water, and the low-pressure steam condensate water can be directly recycled, so that the purpose of recycling the flue gas condensate water is achieved, and the steam heat utilized in the flue gas condensate water treatment process is finally supplied by the absorption heat pump 2, without additional energy consumption; the intermediate water in the flue gas heat exchanger 3 after being heated is conveyed to the absorption heat pump 2 by the intermediate water circulating pump 5 to be cooled, so that the flue gas waste heat is recovered; the absorption heat pump 2 uniformly supplies the low-pressure steam heat and the flue gas heat to the heat network or other media to be heated.

[0043] In addition to the flue gas condensate water, other waste water of the power plant can also enter the heating device 1 through the other waste water inlet 105 of the power plant to be heated, the waste water is heated and evaporated, a small amount of high-temperature high-salt waste water is left, and the high-temperature high-salt waste water enters the absorption heat pump 2 through the electric regulating valve 7 to drive the heat pump to work, and the low-temperature high-salt waste water after being cooled enters the original water treatment system of the power plant.

[0044] Embodiment 2

[0045] A system for flue gas waste heat recovery and flue gas condensate water treatment, the technical solution in the embodiment is basically the same as that in embodiment 1, and the difference lies in that the heating device 1 in the embodiment adopts a two-stage heating form, including two connected heaters, namely a first-stage heater 9 and a second-stage heater 10, as shown in Figure 2 .

[0046] The first-stage heater 9 is provided with a high-pressure steam inlet 101, a high-pressure steam condensate water outlet 102, a first-stage low-pressure steam outlet 113, a first-stage high-temperature high-salt waste water outlet 111, and a second flue gas condensate water inlet 104, and the second-stage heater 10 is provided with a first-stage low-pressure steam inlet 108, a first-stage low-pressure steam condensate water outlet 109, a second-stage low-pressure steam outlet 110, a first flue gas condensate water inlet 103, and a second-stage high-temperature high-salt waste water outlet 112, wherein the first-stage high-temperature high-salt waste water outlet 111 and the second-stage high-temperature high-salt waste water outlet 112 are respectively provided with electric regulating valves 7, and the first-stage high-temperature high-salt waste water and the second-stage high-temperature high-salt waste water are transported to the absorption heat pump 2 through the electric regulating valves 7. The other waste water of the power plant is connected to the flue gas condensate water pipeline through a pipeline, and after being mixed with the flue gas condensate water, enters the inside of the second-stage heater 10 through the first flue gas condensate water inlet 103.

[0047] The bottom of the secondary heater 10 is provided with a flue gas condensate outlet, which is connected with the second flue gas condensate inlet 104 of the primary heater 9 through a pipeline, and a condensate circulating pump 4 is installed on the pipeline.

[0048] The working process of the heating device provided in the embodiment is as follows: flue gas condensate and other waste water of the power plant enter the inside of the secondary heater 10 through the first flue gas condensate inlet 103 by the condensate delivery pump 6, and then are sent into the inside of the primary heater 9 through the second flue gas condensate inlet 104 by the condensate circulating pump 4, high-pressure steam enters the inside of the primary heater 9 to heat the flue gas condensate and the other waste water of the power plant, and becomes high-pressure steam condensate after being cooled, the primary low-pressure steam enters the secondary heater 10 through the primary low-pressure steam outlet 113 to heat the flue gas condensate and the other waste water of the power plant, and becomes low-pressure steam condensate after being cooled, and the high-pressure steam condensate and the low-pressure steam condensate are both returned to the original system of the power plant for reuse; the secondary low-pressure steam generated by heating the flue gas condensate and the other waste water of the power plant in the secondary heater 10 is transported to the absorption heat pump 2 through the secondary low-pressure steam outlet 110 to drive the heat pump system to work; the primary high-temperature high-salt waste water and the secondary high-temperature high-salt waste water generated by the primary heater 9 and the secondary heater 10 are both transported to the absorption heat pump 2 as driving heat sources.

[0049] In addition to the above heating forms, the heating device can be further expanded to a three-stage or multi-stage form according to the steam pressure grade.

[0050] Embodiment 3

[0051] A system for flue gas waste heat recovery and flue gas condensate treatment, the technical solution in the embodiment is basically consistent with the technical solution in Embodiment 1 or Embodiment 2, and the difference lies in that:

[0052] As shown in Figure 3 the absorption heat pump 2 in the embodiment is also provided with an auxiliary heat source inlet 207 and an auxiliary heat source outlet 208, and other heat sources (such as fuel gas or other waste heat of the power plant) other than low-pressure steam and high-temperature high-salt waste water enter the absorption heat pump 2 through the auxiliary heat source inlet 207 to drive the heat pump to work. The absorption heat pump 2 adopts a multi-heat-source driving form, when one of the heat sources fails or is unstable in supply, the other heat sources can continue to provide energy, ensure the continuous operation of the heat pump system, reduce the system downtime caused by the heat source problem, and enhance the stability and reliability of the system operation.

[0053] Embodiment 4

[0054] A system for flue gas waste heat recovery and flue gas condensate treatment, the technical solution in the embodiment is basically consistent with the technical solution in any one of Embodiments 1-3, and the difference lies in that the flue gas heat exchanger 3 in the embodiment adopts a partition wall type heat exchanger.

[0055] AsFigure 4 As shown, the high-temperature flue gas inlet 301 is located at the bottom of the flue gas heat exchanger 3, and the condensate tank 8 is installed on the flue gas condensate conveying pipeline, which serves to collect the flue gas condensate flowing out of the flue gas heat exchanger 3, and functions as a storage and temporary storage of the flue gas condensate, so as to facilitate subsequent treatment or conveying of the flue gas condensate, and ensure the reasonable collection and management of the condensate in the whole system, and maintain the normal operation of the system.

[0056] The system provided by the utility model realizes the integration of flue gas waste heat recovery and flue gas condensate treatment, reduces system investment and land occupation; makes full use of the function of high-pressure steam, realizes the cascade utilization of high-pressure steam, and overcomes the problems of high-pressure steam high energy low use and large loss in the original absorption heat pump process system; can realize efficient treatment of flue gas condensate under the premise of near zero energy consumption, and can meet the requirements of flue gas condensate reuse or discharge, greatly improves the economy of the water treatment system; can further treat other wastewater of the power plant, and improves the economy of the power plant water system.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A system for flue gas waste heat recovery and flue gas condensate treatment, characterized in that, The heating device (1), the absorption heat pump (2) and the flue gas heat exchanger (3) are provided, the heating device (1) is provided with a high-pressure steam inlet (101), a high-pressure steam condensate outlet (102), a low-pressure steam outlet (107) and a flue gas condensate inlet, the flue gas condensate inlet is connected with a flue gas condensate outlet (303) of the flue gas heat exchanger (3) through a pipeline; the low-pressure steam outlet (107) of the heating device (1) is connected with a steam inlet (201) of the absorption heat pump (2) through a pipeline; an intermediate water outlet (304) of the flue gas heat exchanger (3) is connected with an intermediate water inlet of the absorption heat pump (2) through a pipeline, and an intermediate water outlet of the absorption heat pump (2) is connected with an intermediate water inlet (305) of the flue gas heat exchanger (3) through a pipeline.

2. The system of claim 1, wherein, The heating device (1) is further provided with a power plant other wastewater inlet (105).

3. The system of claim 2, wherein, The heating device (1) is provided with a high-temperature high-salinity wastewater outlet (106) at the bottom, and the high-temperature high-salinity wastewater outlet (106) is connected with the absorption heat pump (2) through a pipeline.

4. The system of claim 3, wherein, The absorption heat pump (2) is provided with a low-temperature high-salinity wastewater outlet (204), and the low-temperature high-salinity wastewater outlet (204) is connected with a power plant raw water treatment system through a pipeline.

5. The system of claim 3, wherein, The flue gas condensate inlet of the heating device (1) comprises a first flue gas condensate inlet (103) and a second flue gas condensate inlet (104), the first flue gas condensate inlet (103) is connected with the flue gas heat exchanger (3) through a pipeline, and the second flue gas condensate inlet (104) is connected with the first flue gas condensate inlet (103) through a circulating pipeline.

6. The system of claim 5, wherein, The heating device (1) comprises a primary heater (9) and a secondary heater (10), the primary heater (9) is provided with a high-pressure steam inlet (101) and a second flue gas condensate inlet (104), the secondary heater (10) is provided with a first flue gas condensate inlet (103) and a flue gas condensate outlet, a primary low-pressure steam outlet (113) of the primary heater (9) is connected with a primary low-pressure steam inlet (108) of the secondary heater (10) through a pipeline; the primary heater (9) and the secondary heater (10) are respectively provided with a high-temperature high-salinity wastewater outlet; the flue gas condensate outlet of the secondary heater (10) is connected with the second flue gas condensate inlet (104) through a pipeline.

7. The system of claim 1, wherein, The absorption heat pump (2) is provided with a low-pressure steam condensate outlet (202), and the low-pressure steam condensate outlet (202) is connected with a clean water recycling system through a pipeline.

8. The system of claim 1, wherein, The absorption heat pump (2) is provided with a heat network heating medium inlet (205) and a heat network heating medium outlet (206).

9. The system of claim 1, wherein, The absorption heat pump (2) is further provided with an auxiliary heat source inlet (207) and an auxiliary heat source outlet (208).

10. The system of claim 1, wherein, The flue gas heat exchanger (3) adopts a partition wall type heat exchanger or a spray type heat exchanger.

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