Water recovery device and method for circulating water system and flue gas system of thermal power plant

Abstract

The application provides a water recovery device and method for circulating water systems and flue gas systems of thermal power plants, relates to the field of water recovery technologies for coal-fired power plants, and comprises a high-temperature and high-humidity air source, an absorption heat pump, a condensate tank and a heat exchanger. The high-temperature and high-humidity air source is used for generating water vapor from at least one of the circulating water system and the flue gas system of the thermal power plant. The high-temperature side inlet of the absorption heat pump is connected with the high-temperature and high-humidity air source, the high-temperature side outlet of the absorption heat pump is connected with the condensate tank, and the low-temperature side circulating working medium of the absorption heat pump can exchange heat with the high-temperature side water vapor of the absorption heat pump. The heat exchange water of the heat exchange pipeline of the heat exchanger can exchange heat with the low-temperature side circulating working medium of the absorption heat pump, and the outlet of the heat exchange pipeline of the heat exchanger is connected with an external heat utilization device to supply heat to the outside. The application can deeply couple the water vapor discharged from the circulating water system and the flue gas system, realize efficient condensation recovery of the water vapor and grade improvement and reuse of the waste heat, and achieve remarkable water saving and energy saving effects.

Description

Technical Field

[0001] This invention relates to the field of moisture recovery technology in coal-fired power plants, and more particularly to a moisture recovery device and method for circulating water systems and flue gas systems in thermal power plants. Background Technology

[0002] Thermal power plants are major water consumers in the industrial sector. Their circulating water systems generate significant evaporation losses during operation, with a considerable portion of water resources being directly discharged into the atmosphere as water vapor. At the same time, the flue gas from thermal power plants also carries a large amount of water vapor due to combustion reactions and is discharged into the external environment through chimneys. The aforementioned discharged water vapor has high humidity and is mostly in a saturated state, which not only causes a large amount of water loss through evaporation but also results in a considerable amount of waste heat not being effectively recovered, leading to a double waste of water resources and heat energy. According to statistics, this part of water consumption accounts for more than 60% of the total water consumption of the entire plant.

[0003] In related technologies, the recovery of moisture from flue gas usually only uses traditional heat exchange methods, which have limited recovery efficiency. Moreover, in terms of water-saving renovation of circulating water systems, the focus is mostly on increasing the concentration ratio and treating and reusing wastewater, without recovering the saturated water vapor discharged from the top of the cooling tower or power tower, resulting in a huge waste of potential water and heat energy resources in thermal power plants. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, one embodiment of the present invention proposes a water recovery device for a circulating water system and flue gas system in a thermal power plant. This water recovery device can deeply couple the processing of water vapor discharged from the circulating water system and the flue gas system, realize the efficient condensation and recovery of water vapor and the grade improvement and reuse of waste heat, thereby achieving significant water-saving and energy-saving effects.

[0006] Another embodiment of the present invention provides a method for moisture recovery in the circulating water system and flue gas system of a thermal power plant.

[0007] According to an embodiment of the present invention, a moisture recovery device for a thermal power plant circulating water system and flue gas system includes a high-temperature and high-humidity air source, an absorption heat pump, a condensate tank, and a heat exchanger. The high-temperature and high-humidity air source is water vapor generated by at least one of the circulating water system and the flue gas system of the thermal power plant. The high-temperature side inlet of the absorption heat pump is adapted to be connected to the high-temperature and high-humidity air source to introduce water vapor into the high-temperature side of the absorption heat pump. The high-temperature side outlet of the absorption heat pump is connected to the condensate tank. The low-temperature side circulating working fluid of the absorption heat pump can exchange heat with the high-temperature side water vapor of the absorption heat pump. The heat exchanger pipe inlet is adapted to be connected to an external low-temperature water source to introduce hot water into the heat exchanger pipe. The hot water in the heat exchanger pipe can exchange heat with the low-temperature side circulating working fluid of the absorption heat pump. The heat exchanger pipe outlet is adapted to be connected to an external heat source to supply heat to the outside.

[0008] According to an embodiment of the present invention, a moisture recovery device for a thermal power plant's circulating water system and flue gas system introduces high-temperature, high-humidity air (i.e., water vapor) generated in the circulating water system and flue gas system of a thermal power plant into an absorption heat pump. The circulating working fluid of the absorption heat pump absorbs the heat from the water vapor, yielding condensate, low-temperature gas, and a high-temperature, high-pressure circulating working fluid. The condensate is recovered to a condensate tank to recover moisture from the water vapor, while the high-temperature, high-pressure circulating working fluid continues to exchange heat with the hot water in the heat exchanger's heat exchange pipes. The hot water absorbs heat and becomes hot water, which can then be supplied externally. This converts the low-grade waste heat of the water vapor into a high-grade heat source that can be directly utilized, achieving the dual benefits of water saving and energy saving. Therefore, compared with related technologies, the present invention can deeply couple the processing of water vapor discharged from the circulating water system and the flue gas system, achieving efficient condensation and recovery of water vapor and upgrading and reuse of waste heat, thereby achieving significant water saving and energy saving effects.

[0009] In some embodiments, the heat exchanger includes a housing having a heat exchange cavity, and the heat exchange pipe is disposed in the heat exchange cavity and extends spirally along the extension direction of the heat exchange cavity.

[0010] In some embodiments, the flow direction of the circulating working fluid on the high-temperature side of the absorption heat pump is opposite to the flow direction of the hot water in the heat exchange pipe of the heat exchanger.

[0011] In some embodiments, the moisture recovery device further includes a fan, the air inlet of which is connected to the high-temperature and high-humidity air source, and the air outlet of which is connected to the high-temperature side inlet of the absorption heat pump. The fan is used to provide power for transporting the water vapor.

[0012] In some embodiments, the moisture recovery device further includes an electromagnetic generator, which is provided at the high-temperature side inlet of the absorption heat pump. The electromagnetic generator is used to generate an electromagnetic field on the water vapor to condense water molecules.

[0013] In some embodiments, the moisture recovery device further includes an intermediate water tank and a circulating pump. The intermediate water tank has a receiving cavity and is provided with an inlet, an outlet, and a circulation port communicating with the receiving cavity. The inlet is connected to the heat exchange pipe outlet of the heat exchanger, and the outlet is connected to the external heat source. The inlet of the circulating pump is connected to the circulation port and the external low-temperature water source, and the outlet of the circulating pump is connected to the heat exchange pipe inlet of the heat exchanger.

[0014] In some embodiments, the water recovery device further includes a temperature monitoring element disposed in the intermediate water tank to monitor the temperature of the water in the intermediate water tank.

[0015] In some embodiments, the heat exchanger is at least one, and at least one of the heat exchangers is arranged in parallel between the absorption heat pump and the intermediate water tank.

[0016] A method for moisture recovery in a circulating water system and flue gas system of a thermal power plant according to an embodiment of the present invention, based on the moisture recovery device described in any of the above embodiments, the moisture recovery method includes the following steps:

[0017] Water vapor collection, collecting water vapor generated by at least one of the circulating water system and flue gas system of the thermal power plant; Moisture recovery involves passing the water vapor into an absorption heat pump, where the water vapor releases heat to the circulating working fluid of the absorption heat pump, resulting in condensate, low-temperature gas, and a high-temperature, high-pressure circulating working fluid. The condensate is recovered to a condensate tank, and the low-temperature gas is led to a corresponding chimney or cooling tower for external discharge. Heat recovery is achieved by introducing hot water from an external low-temperature water source into the heat exchanger's heat exchange pipes. The hot water in the heat exchanger's heat exchange pipes absorbs heat from the high-temperature, high-pressure circulating working fluid to obtain hot water for external heating.

[0018] The technical advantages of the water recovery method for the circulating water system and flue gas system of the thermal power plant according to the present invention are the same as the technical advantages of the water recovery device for the circulating water system and flue gas system of the thermal power plant described above, and will not be repeated here.

[0019] In some embodiments, during the heat recovery operation, the hot water and the hot water from the external low-temperature water source enter the heat exchange pipe of the heat exchanger together to continue absorbing the heat from the high-temperature and high-pressure circulating working fluid to obtain intermediate hot water. The intermediate hot water is stored in an intermediate water tank, and when the intermediate hot water reaches a set temperature, it flows out from the intermediate water tank to provide heat to the outside.

[0020] In some embodiments, after the water vapor collection operation, the moisture recovery method further includes the step of: Electromagnetic treatment involves passing the water vapor into an electromagnetic generator, using the electromagnetic field of the generator to condense water molecules in the water vapor and sterilize and kill algae from the water vapor.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a water recovery device for a thermal power plant circulating water system and flue gas system according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the process for a moisture recovery device in a thermal power plant's circulating water system and flue gas system, according to an embodiment of the present invention.

[0024] Figure label: 1. High temperature and high humidity air source; 2. Absorption heat pump; 3. Condensate tank; 4. Heat exchanger; 41. Heat exchange pipes; 42. Outer shell; 421. Heat exchange chamber; 5. Fan; 6. Electromagnetic generator; 7. Intermediate water tank; 71. Receiving cavity; 72. Water inlet; 73. Water outlet; 74. Circulation port; 8. Circulating pump. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figure 1As shown in the figure, a moisture recovery device for a thermal power plant's circulating water system and flue gas system according to an embodiment of the present invention includes a high-temperature and high-humidity air source 1, an absorption heat pump 2, a condensate tank 3, and a heat exchanger 4. The high-temperature and high-humidity air source 1 is water vapor generated by at least one of the thermal power plant's circulating water system and flue gas system. In other words, the high-temperature and high-humidity air source is water vapor generated by each of the thermal power plant's circulating water system and flue gas system, or the high-temperature and high-humidity air source is water vapor generated by the thermal power plant's circulating water system, or the high-temperature and high-humidity air source is water vapor generated by at least one of the thermal power plant's flue gas system; the absorption heat pump 4... The high-temperature side inlet of pump 2 is adapted to be connected to a high-temperature and high-humidity air source 1 to introduce water vapor into the high-temperature side of absorption heat pump 2. The high-temperature side outlet of absorption heat pump 2 is connected to a condensate tank 3. The low-temperature side circulating working fluid of absorption heat pump 2 can exchange heat with the high-temperature side water vapor of absorption heat pump 2. The inlet of heat exchange pipe 41 of heat exchanger 4 is adapted to be connected to an external low-temperature water source to introduce heat exchange water into heat exchange pipe 41 of heat exchanger 4. The heat exchange water in heat exchange pipe 41 of heat exchanger 4 can exchange heat with the low-temperature side circulating working fluid of absorption heat pump 2. The outlet of heat exchange pipe 41 of heat exchanger 4 is adapted to be connected to an external heat source to supply heat to the outside.

[0027] According to an embodiment of the present invention, a moisture recovery device for a thermal power plant's circulating water system and flue gas system introduces high-temperature, high-humidity air (i.e., water vapor) generated in the circulating water system and flue gas system of the thermal power plant into an absorption heat pump 2. The circulating working fluid of the absorption heat pump 2 absorbs the heat from the water vapor, yielding condensate, low-temperature gas, and a high-temperature, high-pressure circulating working fluid. The condensate is recovered to a condensate tank 3 to recover moisture from the water vapor, while the high-temperature, high-pressure circulating working fluid continues to exchange heat with the hot water in the heat exchange pipe 41 of the heat exchanger 4. The hot water absorbs heat and becomes hot water, which can be supplied externally. This converts the low-grade waste heat of the water vapor into a high-grade heat source that can be directly utilized, achieving the dual benefits of water saving and energy saving. Therefore, compared with related technologies, the present invention can deeply couple the processing of water vapor discharged from the circulating water system and the flue gas system, achieving efficient condensation and recovery of water vapor and upgrading and reuse of waste heat, thereby achieving significant water saving and energy saving effects.

[0028] Specifically, an absorption heat pump can be an air source heat pump, which can make full use of the low-grade heat source in water vapor. Absorption heat pumps typically include a ceramic heat exchanger, an evaporator, and a condenser. High-temperature, high-humidity air first enters the ceramic heat exchanger in the absorption heat pump for heat exchange. The evaporator and ceramic heat exchanger continuously absorb heat energy from the high-temperature, high-humidity air through circulating working fluid. Since the air is saturated with humidity, a large amount of condensate is released on the outside (shell side) of the heat exchange tubes of the ceramic heat exchanger after heat exchange and cooling, and can be collected in a condensate tank. In other words, the absorption heat pump utilizes the low-grade waste heat in water vapor as a driving energy source. Through the circulating working fluid, the ceramic heat exchanger efficiently absorbs heat, cooling the saturated high-temperature, high-humidity air to obtain condensate. The heat absorbed by the evaporator is then used for heat exchange in the condenser through the circulating working fluid and the work of the air source heat pump to heat and pressurize the low-pressure, low-temperature circulating working fluid, thereby obtaining a high-grade heat source. The specific structure and working principle of the absorption heat pump can be described using existing technology in this field, and will not be elaborated further here.

[0029] It should be noted that the water vapor generated in the "circulating water system of a thermal power plant" is mainly saturated water vapor discharged from the top of the cooling tower or mechanical tower, or in other words, high-temperature and high-humidity air. The water vapor generated in the "flue gas system of a thermal power plant" is mainly flue gas discharged from the chimney of the thermal power plant.

[0030] In addition, "external heating" can refer to supplying hot water or heating to external users, such as using hot water for heating, ventilation, and air conditioning (HVAC) on the user side.

[0031] like Figure 1 As shown, in some embodiments, the heat exchanger 4 includes a housing 42, the housing 42 having a heat exchange cavity 421, and a heat exchange pipe 41 disposed in the heat exchange cavity 421 and extending spirally along the extension direction of the heat exchange cavity 421.

[0032] Understandably, designing the heat exchange pipes as coil structures, or spiral pipes, not only significantly increases the heat exchange area per unit volume of the heat exchange chamber, enabling the heat exchanger to be lightweight, but also the smooth and continuous curved flow channels of the heat exchange pipes can effectively reduce the uneven blockage and corrosion caused by scaling of the hot water in the flow channels, so that the water recovery device can operate stably and efficiently for a long time.

[0033] like Figure 1 As shown, in some embodiments, the flow direction of the circulating working fluid on the high-temperature side of the absorption heat pump 2 is opposite to the flow direction of the hot water in the heat exchange pipe 41 of the heat exchanger 4. In other words, the two are in countercurrent heat exchange. Therefore, while ensuring the heat exchange effect between the two, the heat of the high-temperature and high-pressure circulating working fluid can be absorbed to the maximum extent, and the temperature of the heated hot water can be increased to further reduce heat energy waste.

[0034] like Figure 1As shown, in some embodiments, the moisture recovery device further includes a fan 5, the air inlet of which is connected to a high-temperature and high-humidity air source 1, and the air outlet of which is connected to the high-temperature side inlet of the absorption heat pump 2. The fan 5 is used to provide power for transporting water vapor.

[0035] Understandably, the fan can actively extract high-temperature and high-humidity air / flue gas from the cooling tower or chimney and deliver it to the absorption heat pump. The water vapor contained in the high-temperature and high-humidity air or flue gas is deeply cooled in the absorption heat pump, causing a large amount of saturated water vapor to condense and precipitate out, and collect in the condensate tank, thereby achieving the purpose of directly recovering water resources from the air or flue gas.

[0036] like Figure 1 As shown, in some embodiments, the moisture recovery device also includes an electromagnetic generator 6. The high-temperature side inlet of the absorption heat pump 2 is equipped with an electromagnetic generator 6. Based on the above structure, it can be seen that the electromagnetic generator is connected in series between the air outlet of the fan and the high-temperature side inlet of the absorption heat pump. The electromagnetic generator 6 is used to generate an electromagnetic field to condense water molecules.

[0037] Understandably, an electromagnetic generator can use an electromagnetic field to directly act on the polar water molecules in high-temperature and high-humidity air or flue gas. Under the influence of electromagnetic force, the interaction force between water molecules changes, altering the arrangement and orientation of water molecules, reducing the dispersion of water molecules in the air, and accelerating the coagulation of water molecules so that water molecules can more easily gather to form water droplets, thereby improving dehumidification efficiency and promoting the efficiency of air water extraction.

[0038] At the same time, electromagnetic fields can also damage the cell membranes of microorganisms and interfere with their metabolic processes, thereby achieving the effect of sterilization and algae removal.

[0039] like Figure 1 As shown, in some embodiments, the water recovery device further includes an intermediate water tank 7 and a circulating pump 8. The intermediate water tank 7 has a receiving cavity 71 and is provided with an inlet 72, an outlet 73 and a circulation port 74 communicating with the receiving cavity 71. The inlet 72 is connected to the outlet of the heat exchange pipe 41 of the heat exchanger 4, and the outlet 73 is connected to an external heat source. The inlet of the circulating pump 8 is connected to the circulation port 74 and an external low-temperature water source, and the outlet of the circulating pump 8 is connected to the inlet of the heat exchange pipe 41 of the heat exchanger 4.

[0040] Understandably, after the hot water in the heat exchange pipe exchanges heat with the high-temperature and high-pressure circulating working fluid, it is heated to the temperature of hot water. The hot water can be stored in the intermediate water tank, and then flows out from the circulation port and merges with the hot water supplied by the external low-temperature water source. It is then pumped into the heat exchanger by the circulation pump to continue to absorb heat from the high-temperature and high-pressure circulating working fluid and thus further heat up. After that, it enters the intermediate water tank again for temporary storage, and the above process is repeated until the water temperature in the intermediate water tank reaches the set temperature, and then water is discharged from the outlet to supply heat to the outside.

[0041] Therefore, by using an intermediate water tank, a circulating pump, and a heat exchanger in combination, the high-grade heat source obtained by the absorption heat pump can be continuously transferred to the user side, realizing the cascade utilization of waste heat.

[0042] like Figure 1 As shown, in some embodiments, the water recovery device further includes a temperature monitoring element (not shown in the figure). The temperature monitoring element is located in the intermediate water tank 7 to monitor the temperature of the water in the intermediate water tank 7, so as to control the external heating and the recirculation of the water in the intermediate water tank according to the monitoring data of the temperature monitoring element, thereby improving the control accuracy of the hot water temperature. The temperature monitoring element is not limited to a temperature sensor.

[0043] like Figure 1 As shown, in some embodiments, there is at least one heat exchanger 4, and at least one heat exchanger 4 is arranged in parallel between the absorption heat pump 2 and the intermediate water tank 7.

[0044] Understandably, using multiple heat exchangers in parallel can not only further improve heat exchange efficiency, but also ensure the continuity of operation of the moisture recovery system by simply shutting down and maintaining one heat exchanger when it needs to be repaired or damaged, while the other heat exchangers continue to operate.

[0045] Therefore, compared with related technologies, this invention can deeply couple the processing of high-humidity exhaust gas from the circulating water system and flue gas system of thermal power plants. While efficiently recovering clean condensate, it converts the low-grade waste heat in it into a high-grade heat source that can be directly utilized, achieving the dual benefits of water saving and energy saving. It can be widely used in the fields of flue gas and steam water recovery in thermal power plants, chemical enterprises, etc., with obvious water saving effect, strong practicality, and significant overall economic benefits.

[0046] like Figure 2 As shown, an embodiment of the present invention provides a method for moisture recovery in a thermal power plant circulating water system and flue gas system. Based on the moisture recovery device of any of the above embodiments, the moisture recovery method includes the following steps: Step S1, water vapor collection, collecting water vapor generated by at least one of the circulating water system and flue gas system of the thermal power plant; Step S2, moisture recovery: water vapor is introduced into absorption heat pump 2. The water vapor releases heat to the circulating working fluid of absorption heat pump 2, resulting in condensate, low-temperature gas and high-temperature and high-pressure circulating working fluid. The condensate is recovered to condensate tank 3, and the low-temperature gas is led to the corresponding chimney or cooling tower for external discharge. Step S3, heat recovery: hot water is introduced into the heat exchange pipe 41 of the heat exchanger 4 from an external low-temperature water source. The hot water in the heat exchange pipe 41 of the heat exchanger 4 absorbs heat from the high-temperature and high-pressure circulating working fluid to obtain hot water for external heating.

[0047] The technical advantages of the water recovery method for the circulating water system and flue gas system of the thermal power plant according to the present invention are the same as the technical advantages of the water recovery device for the circulating water system and flue gas system of the thermal power plant described above, and will not be repeated here.

[0048] In some embodiments, during step S3, the hot water and the hot water from the external low-temperature water source enter the heat exchange pipe 41 of the heat exchanger 4 together to continue absorbing the heat of the high-temperature and high-pressure circulating working fluid to obtain intermediate hot water. The intermediate hot water is stored in the intermediate water tank 7, and when the intermediate hot water reaches the set temperature, it flows out from the intermediate water tank 7 to supply heat to the outside.

[0049] like Figure 2 As shown, in some embodiments, after step S1, the moisture recovery method further includes the following step: Step S1', electromagnetic treatment: water vapor is introduced into the electromagnetic generator 6, and the electromagnetic field of the electromagnetic generator 6 is used to condense water molecules in the water vapor and sterilize and kill algae in the water vapor.

[0050] Example 1 A method for moisture recovery in a circulating water system and flue gas system of a thermal power plant, based on the aforementioned system, includes the following steps: 1) The high-temperature and high-humidity air generated in the cooling tower and chimney is drawn by the fan, and a large amount of saturated water vapor is continuously transported to the absorption heat pump through the pipeline; 2) The electromagnetic generator can directly act on the high temperature and high humidity air in the pipe, using the electromagnetic field to change the structure of water vapor molecules, improve the efficiency of the dehumidification process, and play a role in sterilization and algae removal, so as to promote the water extraction efficiency of the subsequent absorption heat pump. 3) Through the energy conversion of the absorption heat pump, saturated water vapor condenses a large amount of water after the water vapor is cooled and is collected in the condensate tank, thus achieving the purpose of taking water from the air or flue gas. This step can collect a large amount of water. The higher the degree of cooling and the greater the amount of water recovered, the better the energy saving effect. 4) Absorption heat pumps utilize low-grade waste heat in water vapor as driving energy. They efficiently absorb heat from saturated, high-temperature, and high-humidity air through a circulating working fluid. The absorption heat pump then heats and pressurizes the low-pressure, low-temperature circulating working fluid to obtain a high-grade heat source. 5) Finally, the intermediate water tank, circulating pump and heat exchanger work together to continuously convert the high-quality heat source obtained by the absorption heat pump to provide heat to the user side and realize the utilization of waste heat.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A moisture recovery device for a circulating water system and flue gas system in a thermal power plant, characterized in that, include: High temperature and high humidity air source, wherein the high temperature and high humidity air source is water vapor generated by at least one of the circulating water system and flue gas system of the thermal power plant; An absorption heat pump and a condensate tank are provided. The high-temperature inlet of the absorption heat pump is adapted to be connected to the high-temperature and high-humidity air source to introduce water vapor into the high-temperature side of the absorption heat pump. The high-temperature outlet of the absorption heat pump is connected to the condensate tank. The low-temperature circulating working fluid of the absorption heat pump can exchange heat with the water vapor on the high-temperature side of the absorption heat pump. A heat exchanger, wherein the inlet of the heat exchanger's heat exchange pipe is adapted to be connected to an external low-temperature water source to allow hot water to be introduced into the heat exchanger's heat exchange pipe, the hot water in the heat exchanger's heat exchange pipe is capable of exchanging heat with the low-temperature circulating working fluid of the absorption heat pump, and the outlet of the heat exchanger's heat exchange pipe is adapted to be connected to an external heat source to supply heat to the outside. An electromagnetic generator is provided at the high-temperature side inlet of the absorption heat pump. The electromagnetic generator is used to generate an electromagnetic field on the water vapor to condense water molecules. An intermediate water tank has a receiving cavity and is provided with an inlet, an outlet and a circulation port that communicate with the receiving cavity. The inlet is connected to the heat exchange pipe outlet of the heat exchanger, and the outlet is connected to the external heat source. A circulating pump, the inlet of which is connected to the circulation port and the external low-temperature water source, and the outlet of which is connected to the inlet of the heat exchanger's heat exchange pipe.

2. The moisture recovery device for the circulating water system and flue gas system of a thermal power plant according to claim 1, characterized in that, The heat exchanger includes a housing with a heat exchange cavity, and the heat exchange pipe is disposed in the heat exchange cavity and extends spirally along the extension direction of the heat exchange cavity.

3. The moisture recovery device for the circulating water system and flue gas system of a thermal power plant according to claim 1, characterized in that, It also includes a fan, the air inlet of which is connected to the high temperature and high humidity air source, and the air outlet of which is connected to the high temperature side inlet of the absorption heat pump. The fan is used to provide power for transporting the water vapor.

4. The moisture recovery device for the circulating water system and flue gas system of a thermal power plant according to claim 1, characterized in that, It also includes a temperature monitoring device, which is installed in the intermediate water tank to monitor the temperature of the water in the intermediate water tank.

5. The moisture recovery device for the circulating water system and flue gas system of a thermal power plant according to claim 1, characterized in that, The heat exchanger is at least one, and at least one of the heat exchangers is arranged in parallel between the absorption heat pump and the intermediate water tank.

6. A method for moisture recovery in a circulating water system and flue gas system of a thermal power plant, based on the moisture recovery device as described in any one of claims 1-5, characterized in that, The moisture recovery method includes the following steps: Water vapor collection, collecting water vapor generated by at least one of the circulating water system and flue gas system of the thermal power plant; Moisture recovery involves passing the water vapor into an absorption heat pump, where the water vapor releases heat to the circulating working fluid of the absorption heat pump, resulting in condensate, low-temperature gas, and a high-temperature, high-pressure circulating working fluid. The condensate is recovered to a condensate tank, and the low-temperature gas is led to a corresponding chimney or cooling tower for external discharge. Heat recovery is achieved by introducing hot water from an external low-temperature water source into the heat exchanger's heat exchange pipes. The hot water in the heat exchanger's heat exchange pipes absorbs heat from the high-temperature, high-pressure circulating working fluid to obtain hot water for external heating.

7. The method for moisture recovery in the circulating water system and flue gas system of a thermal power plant according to claim 6, characterized in that, In the heat recovery operation, the hot water and the hot water from the external low-temperature water source enter the heat exchange pipe of the heat exchanger together to continue absorbing the heat of the high-temperature and high-pressure circulating working fluid to obtain intermediate hot water. The intermediate hot water is stored in an intermediate water tank, and when the intermediate hot water reaches the set temperature, it flows out from the intermediate water tank to supply heat to the outside.

8. The method for moisture recovery in the circulating water system and flue gas system of a thermal power plant according to claim 6 or 7, characterized in that, Following the water vapor collection operation, the moisture recovery method further includes the following steps: Electromagnetic treatment involves passing the water vapor into an electromagnetic generator, using the electromagnetic field of the generator to condense water molecules in the water vapor and sterilize and kill algae from the water vapor.

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