Steam generating device of multi-effect heat pump

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a multi-effect heat pump steam generation device, and aims to solve the problem of heat energy waste of an evaporation side of an existing heat pump. In order to achieve the purpose, the multiple-effect heat pump steam generation device comprises a heat pump system, the heat pump system comprises an evaporator and a condenser, and the evaporator is communicated with an evaporation heat conduction pipeline. The flash evaporation system comprises a steam output pipeline used for conveying steam and a condensate water input pipeline used for conveying liquid. And the wastewater supply system comprises a wastewater inlet pipeline and a concentrated water discharge pipeline. And the multi-effect evaporation system can evaporate and concentrate the wastewater by adopting the temperature of the steam. The waste heat recycling system comprises a waste heat exchanger and an evaporation waste heat pipeline communicated with the multi-effect evaporation system, the evaporation waste heat pipeline and the evaporation heat conduction pipeline are in heat exchange coupling through the waste heat exchanger, and the waste heat exchanger is arranged to be capable of heating a medium in the evaporation heat conduction pipeline. And the problem of direct emission of low-grade waste heat in the traditional technology is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and particularly provides a multi-effect heat pump steam generating device. Background Art

[0002] With the breakthrough of current high-flow, high-pressure ratio, high-temperature compressor technology, by using a single-stage refrigerant heat pump with a large temperature rise, a temperature rise of 30 - 70 °C can be achieved on the condensation side of the heat pump, which is applicable to all current multi-effect evaporation systems with a steam temperature ≤ 130 °C.

[0003] In the prior art, generally, the steam with high-grade heat energy on the condensation side of the heat pump is fully utilized, while the medium with low-grade heat energy at other positions is ignored, resulting in waste of energy.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems and address the problem of waste of heat energy on the evaporation side of existing heat pumps.

[0006] The present invention provides a multi-effect heat pump steam generating device, comprising: A heat pump system, which includes an evaporator and a condenser, and the evaporation heat conduction pipeline communicated with the evaporator and the refrigerant pipeline of the heat pump system are heat exchange coupled through the evaporator; A flash evaporation system, whose water circulation pipeline and the refrigerant pipeline of the heat pump system are heat exchange coupled through the condenser, and it further includes a steam output pipeline for transmitting steam and a condensate input pipeline for transmitting liquid; A waste water supply system, which includes a waste water inlet pipeline and a concentrated water discharge pipeline; A multi-effect evaporation system, which is communicated with the steam output pipeline, the condensate input pipeline, the waste water inlet pipeline and the concentrated water discharge pipeline, and is configured to be able to evaporate and concentrate waste water using the temperature of the steam; A waste heat recycling system, which includes a waste heat exchanger and an evaporation waste heat pipeline communicated with the multi-effect evaporation system, the evaporation waste heat pipeline is configured to be able to transmit steam, the evaporation waste heat pipeline and the evaporation heat conduction pipeline are heat exchange coupled through the waste heat exchanger, and the waste heat exchanger is configured to be able to heat the medium in the evaporation heat conduction pipeline.

[0007] In the case of adopting the above technical solution, the low-grade waste heat of the multi-effect evaporation system is recovered by the waste heat reuse system and coupled with the heat pump system to realize the collaborative utilization of high-grade and low-grade thermal energy, and the comprehensive energy utilization rate is increased by 30%-50%. The multi-effect evaporation system directly uses the steam generated by the heat pump to gradually evaporate and concentrate the wastewater, reducing the steam consumption and at the same time reducing the energy consumption of wastewater treatment. The heat pump system, the flash evaporation system and the multi-effect evaporation system form a closed cycle, and the evaporation heat conduction pipeline is heated through the evaporation waste heat pipeline, avoiding the problem of direct discharge of low-grade waste heat in the traditional technology.

[0008] In the specific implementation manner of the above multi-effect heat pump steam generating device, the waste heat reuse system further includes a cooling tower, a cooling pipeline and a cooling heat exchanger. Both ends of the cooling pipeline are communicated with the cooling tower. The evaporation heat conduction pipeline sequentially passes through the cooling heat exchanger and the waste heat exchanger along the medium flow direction, and the evaporation heat conduction pipeline is heat exchange-coupled with the cooling pipeline through the cooling heat exchanger.

[0009] In the specific implementation manner of the above multi-effect heat pump steam generating device, the flash evaporation system includes a flash evaporation tank and a flash evaporation condensation tank; The flash evaporation tank is communicated with the water circulation pipeline, the flash evaporation tank is communicated with the steam output pipeline, and the flash evaporation tank is configured to be able to evaporate and vaporize the internal liquid medium; The flash evaporation condensation tank is communicated with the water circulation pipeline, the flash evaporation condensation tank is communicated with the condensate input pipeline, and the flash evaporation condensation tank is configured to be able to store the liquid medium and transmit the liquid medium to the condenser through the water circulation pipeline.

[0010] In the case of adopting the above technical solution, the cooling heat exchanger and the waste heat exchanger are connected in series to cool and then heat the medium in the evaporation heat conduction pipeline. The initial temperature of the medium in the evaporation heat conduction pipeline is adjusted by the cooling tower, avoiding the efficiency reduction of the waste heat exchanger due to the too high medium temperature.

[0011] In the specific implementation manner of the above multi-effect heat pump steam generating device, a spray head is arranged in the flash evaporation tank. A flash evaporation steam port is arranged at the upper end of the flash evaporation tank, and the flash evaporation steam port is communicated with the steam output pipeline. A flash evaporation water return port is arranged at the lower end of the flash evaporation tank; A condensate inlet is arranged at the upper end of the flash evaporation condensation tank, and the condensate inlet is communicated with the condensate input pipeline. A condensate water return port is arranged at the lower end of the flash evaporation condensation tank; The water circulation pipeline includes a water circulation inlet pipeline, a first water circulation outlet pipeline, and a second water circulation outlet pipeline. The water circulation inlet pipeline is communicated with the nozzle in the flash evaporation tank for conveying the medium into the flash evaporation tank. The first water circulation outlet pipeline is communicated with the flash evaporation return water port for conveying the medium at the bottom of the flash evaporation tank to the condenser. The second water circulation outlet pipeline is communicated with the condensation return water port for conveying the medium at the bottom of the flash condensation tank to the condenser.

[0012] In the case of adopting the above technical solution, the flash evaporation tank and the flash condensation tank are separated and designed to achieve the rapid separation of the vaporization of the liquid medium and the condensed water, and the stability of the steam output is enhanced. The nozzle evenly distributes the liquid medium to the flash evaporation tank to avoid local overheating or scaling.

[0013] In the specific embodiment of the above multi-effect heat pump steam generating device, the flash evaporation tank is provided with a heater, and the heater is configured to be able to heat the flash evaporation tank.

[0014] In the case of adopting the above technical solution, when the heat supply of the heat pump system is insufficient, the heater can supplement heat to maintain the temperature of the flash evaporation tank and ensure the stable output of steam.

[0015] In the specific embodiment of the above multi-effect heat pump steam generating device, a first drain pipe is provided on the first water circulation outlet pipeline, and a first drain valve is provided on the first drain pipe; and / or A second drain pipe is provided on the second water circulation outlet pipeline, and a second drain valve is provided on the second drain pipe; and / or A third drain pipe is communicated with the lower end of the flash condensation tank, and a third drain valve is provided on the third drain pipe.

[0016] In the case of adopting the above technical solution, the first drain valve and the second drain valve independently control the discharge of the accumulated liquid at the bottom of the flash evaporation tank and the flash condensation tank to prevent pipeline blockage. The third drain valve is used for the emergency drainage of the flash condensation tank to avoid steam backflow or equipment corrosion caused by too high a liquid level.

[0017] In the specific embodiment of the above multi-effect heat pump steam generating device, the multi-effect evaporation system includes a first-effect evaporator, a second-effect evaporator, and a third-effect evaporator; The first-effect evaporator is communicated with the steam output pipeline. The first-effect evaporator is communicated with the second-effect evaporator through a first steam pipeline. The second-effect evaporator is communicated with the third-effect evaporator through a second steam pipeline. The third-effect evaporator is communicated with the evaporation waste heat pipeline.

[0018] In the case of adopting the above technical solution, the first-effect evaporator directly utilizes high-grade steam, and the second-effect evaporator and the third-effect evaporator utilize the waste heat of the previous effect, and the steam utilization rate is increased to more than 85%.

[0019] In the specific embodiment of the multi-effect heat pump steam generation device described above, the waste water supply system includes a first waste water heat exchanger and a second waste water heat exchanger; The waste water inlet pipeline is heat exchange-coupled with the evaporation waste heat pipeline in the first waste water heat exchanger; A steam output branch is provided on the steam output pipeline, and the steam output branch is heat exchange-coupled with the waste water inlet pipeline in the second waste water heat exchanger; both the first waste water heat exchanger and the second waste water heat exchanger are configured to heat the waste water in the waste water inlet pipeline.

[0020] In the case of adopting the above technical solution, the waste water is heated in two stages by the first waste water heat exchanger and the second waste water heat exchanger, and the temperature of the waste water is raised to more than 60 °C.

[0021] In the specific embodiment of the multi-effect heat pump steam generation device described above, the multi-effect heat pump steam generation device further includes a gas-liquid separator, the gas-liquid separator is provided with an open mouth, and the evaporation waste heat pipeline passing through the first waste water heat exchanger is communicated with the gas-liquid separator.

[0022] In the specific embodiment of the multi-effect heat pump steam generation device described above, the concentrated waste discharge pipeline is respectively communicated with the first-effect evaporator, the second-effect evaporator and the third-effect evaporator, and is configured to discharge the waste liquid in the first-effect evaporator, the second-effect evaporator and the third-effect evaporator.

[0023] In the case of adopting the above technical solution, the open gas-liquid separator separates the steam-water mixture in the evaporation waste heat pipeline, avoiding the influence of liquid water entering the waste heat exchanger on the heat exchange efficiency. The concentrated waste discharge pipeline is respectively connected to each effect evaporator, and can empty the liquid inside each effect evaporator in case of emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of the overall structure of the multi-effect heat pump steam generation device; Figure 2 is a schematic diagram of the connection relationship between the heat pump system and the flash evaporation system of the multi-effect heat pump steam generation device; Figure 3 is a schematic diagram of the connection relationship of the multi-effect evaporation system in the multi-effect heat pump steam generation device.

[0025] List of reference numerals: 1 - heat pump system; 11 - evaporation heat conduction pipeline; 2 - multi-effect evaporation system; 21 - first-effect evaporator; 211 - first-effect heat exchanger; 212 - first-effect evaporation tank; 213 - first-effect circulation pipe; 214 - first-effect delivery pipe; 215 - steam output branch; 216 - first-effect steam delivery pipe; 22 - second-effect evaporator; 221 - second-effect heat exchanger; 222 - second-effect evaporation tank; 223 - second-effect circulation pipe; 224 - second-effect delivery pipe; 225 - second-effect steam delivery pipe; 23 - third-effect evaporator; 231 - third-effect heat exchanger; 232 - third-effect evaporation tank; 233 - third-effect circulation pipe; 234 - third-effect steam delivery pipe; 24 - steam pipeline one; 25 - steam pipeline two; 31 - cooling pipeline; 32 - cooling tower; 33 - cooling circulation pump; 34 - cooling heat exchanger; 41 - waste water inlet pipeline; 42 - pre-hardness removal chemical dosing device; 43 - concentrated drainage pipeline; 44 - first waste water heat exchanger; 45 - second waste water heat exchanger; 46 - concentrated liquid storage tank; 5 - flash evaporation system; 51 - steam output pipeline; 52 - condensate input pipeline; 53 - flash evaporation tank; 531 - spray head; 532 - heater; 541 - water circulation inlet pipeline; 542 - first water circulation outlet pipeline; 5421 - first water pump; 5422 - first drain pipe; 5423 - first drain valve; 543 - second water circulation outlet pipeline; 5431 - second water pump; 5432 - second drain pipe; 5433 - second drain valve; 5441 - third drain pipe; 5442 - third drain valve; 55 - flash evaporation condensate tank; 56 - drain water tank; 6 - gas-liquid separator; 7 - condensate tank; 71 - make-up water pipeline; 72 - condensate drainage pipeline; 81 - evaporation waste heat pipeline; 82 - waste heat exchanger. Detailed implementation manners

[0026] The preferred implementation manners of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present application and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0027] It should be noted that in the description of this application, unless otherwise clearly specified and defined, terms such as "arranged" and "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or other connections; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, terms such as "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, "a plurality of" means at least two. It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, "a plurality of" in this application means at least two.

[0028] As Figures 1 - 3 shown, to solve the problem of waste heat in the evaporation side of existing heat pumps, the present invention provides a multi-effect heat pump steam generating device, including: a heat pump system 1, which includes an evaporator and a condenser, and the evaporation heat conduction pipeline 11 communicated with the evaporator and the refrigerant pipeline of the heat pump system 1 are heat exchange coupled through the evaporator; a flash evaporation system 5, whose water circulation pipeline and the refrigerant pipeline of the heat pump system 1 are heat exchange coupled through the condenser, and it also includes a steam output pipeline 51 for transmitting steam and a condensate input pipeline 52 for transmitting liquid; a waste water supply system, which includes a waste water inlet pipeline 41 and a concentrated water discharge pipeline 43; a multi-effect evaporation system 2, which is communicated with the steam output pipeline 51, the condensate input pipeline 52, the waste water inlet pipeline 41 and the concentrated water discharge pipeline 43, and is arranged to be able to evaporate and concentrate the waste water by using the temperature of the steam; a waste heat reuse system, which includes a waste heat exchanger 82 and an evaporation waste heat pipeline 81 communicated with the multi-effect evaporation system 2, the evaporation waste heat pipeline 81 is arranged to be able to transmit steam, the evaporation waste heat pipeline 81 and the evaporation heat conduction pipeline 11 are heat exchange coupled through the waste heat exchanger 82, and the waste heat exchanger 82 is arranged to be able to heat the medium in the evaporation heat conduction pipeline 11. In this way, the low-grade waste heat of the multi-effect evaporation system 2 is recovered through the waste heat reuse system and coupled with the heat pump system 1 to realize the collaborative utilization of high-grade and low-grade heat energy, and the comprehensive energy utilization rate is increased by 30%-50%. The multi-effect evaporation system 2 directly uses the steam generated by the heat pump to gradually evaporate and concentrate the waste water, reducing the steam consumption and at the same time reducing the energy consumption of waste water treatment. The heat pump system 1, the flash evaporation system 5 and the multi-effect evaporation system 2 form a closed cycle, and the evaporation heat conduction pipeline 11 is heated through the evaporation waste heat pipeline 81, avoiding the problem of direct discharge of low-grade waste heat in the traditional technology.

[0029] AsFigure 1 As shown, in one or more embodiments, the wastewater inlet pipeline 41, the pre-hardness removal chemical addition device 42, the multi-effect evaporation system 2, and the concentrated wastewater discharge pipeline 43 are connected in sequence, and the wastewater flows along the wastewater inlet pipeline 41, the pre-hardness removal chemical addition device 42, the multi-effect evaporation system 2, and the concentrated wastewater discharge pipeline 43. The pre-hardness removal chemical addition device 42 can pre-treat the wastewater to prevent the pipeline from being blocked by water scale. Of course, the pre-hardness removal chemical addition device 42 may not be provided.

[0030] As Figure 2 shown, in one or more embodiments, the heat pump system 1 includes an evaporator and a condenser. The evaporator is connected to the evaporation heat conduction pipeline 11, the outlet end of the condenser is connected to the water circulation inlet pipeline 541, and the inlet end of the condenser is connected to the first water circulation outlet pipeline 542. The flash evaporation system 5 includes a flash evaporation tank 53 and a flash evaporation condensation tank 55.

[0031] In one or more embodiments, a spray head 531 is provided in the flash evaporation tank 53. A flash evaporation steam port is provided at the upper end of the flash evaporation tank 53, and the flash evaporation steam port is connected to the steam output pipeline 51. A flash evaporation return water port is provided at the lower end of the flash evaporation tank 53. The flash evaporation tank 53 is provided with a heater 532, and the heater 532 is configured to be able to heat the flash evaporation tank 53. Thus, when the heat supply of the heat pump system 1 is insufficient, the heater 532 supplements heat to maintain the temperature of the flash evaporation tank 53 and ensure stable steam output. Of course, the heater 532 may not be provided.

[0032] In one or more embodiments, a condensation water inlet is provided at the upper end of the flash evaporation condensation tank 55, and the condensation water inlet is connected to the condensation water input pipeline 52. A condensation water return port is provided at the lower end of the flash evaporation condensation tank 55.

[0033] As Figure 2As shown, in one or more embodiments, the water circulation pipeline includes a water circulation inlet pipeline 541, a first water circulation outlet pipeline 542, and a second water circulation outlet pipeline 543. One end of the water circulation inlet pipeline 541 is communicated with the nozzle 531 in the flash tank 53, and the other end of the water circulation inlet pipeline 541 is communicated with the outlet end of the condenser for delivering the medium into the flash tank 53. One end of the first water circulation outlet pipeline 542 is communicated with the flash return water port, and the other end of the first water circulation outlet pipeline 542 is communicated with the inlet end of the condenser. The flash return water port is communicated for delivering the medium at the bottom of the flash tank 53 to the condenser. A first drain pipe 5422 is provided on the first water circulation outlet pipeline 542, and a first drain valve 5423 is provided on the first drain pipe 5422. A first water pump 5421 is provided on the first water circulation outlet pipeline 542, and the medium at the bottom of the flash tank 53 can be pumped through the first water pump 5421 and delivered to the condenser. One end of the second water circulation outlet pipeline 543 is communicated with the condensation return water port, and the other end of the second water circulation outlet pipeline 543 is communicated with the first water circulation outlet pipeline 542. The medium at the bottom of the flash condensation tank 55 is delivered to the condenser through the second water circulation outlet pipeline 543 and the first water circulation outlet pipeline 542. A second drain pipe 5432 is provided on the second water circulation outlet pipeline 543, and a second drain valve 5433 is provided on the second drain pipe 5432. A second water pump 5431 is provided on the second water circulation outlet pipeline 543, and the medium at the bottom of the flash condensation tank 55 can be pumped through the second water pump 5431 and delivered to the first water circulation outlet pipeline 542. A third drain pipe 5441 is communicated with the lower end of the flash condensation tank 55, and a third drain valve 5442 is provided on the third drain pipe 5441. In this way, the first drain valve 5423 and the second drain valve 5433 independently control the liquid accumulation discharge at the bottoms of the flash tank 53 and the flash condensation tank 55 to prevent pipeline blockage. The third drain valve 5442 is used for emergency liquid discharge of the flash condensation tank 55 to avoid steam backflow or equipment corrosion caused by too high liquid level.

[0034] As Figure 3 shown, in one or more embodiments, the multi-effect evaporation system 2 includes a first-effect evaporator 21, a second-effect evaporator 22, and a third-effect evaporator 23; the first-effect evaporator 21 is communicated with the steam output pipeline 51, the first-effect evaporator 21 is communicated with the second-effect evaporator 22 through a first steam pipeline 24, the second-effect evaporator 22 is communicated with the third-effect evaporator 23 through a second steam pipeline 25, and the third-effect evaporator 23 is communicated with the evaporation waste heat pipeline 81. In this way, the first-effect evaporator 21 directly utilizes high-grade steam, and the second-effect evaporator and the third-effect evaporator 23 utilize the waste heat of the previous effect, and the steam utilization rate is increased to more than 85% compared with the traditional system.

[0035] As Figure 1 and Figure 3As shown, in one or more embodiments, the first-effect evaporator 21 includes a first-effect heat exchanger 211 and a first-effect evaporation tank 212; the second-effect evaporator 22 includes a second-effect heat exchanger 221 and a second-effect evaporation tank 222; the third-effect evaporator 23 includes a third-effect heat exchanger 231 and a third-effect evaporation tank 232. In one or more embodiments, a wastewater supply system includes a wastewater inlet pipeline 41, a concentrated wastewater discharge pipeline 43, a first wastewater heat exchanger 44, and a second wastewater heat exchanger 45. The multi-effect heat pump steam generation device further includes a condensate make-up water system, and the condensate make-up water system includes a condensate tank 7, a make-up water pipeline 71, and a condensate drainage pipeline 72. The waste heat recycling system includes a waste heat exchanger 82, an evaporation waste heat pipeline 81, a cooling tower 32, a cooling pipeline 31, and a cooling heat exchanger 34.

[0036] As Figure 3 shown, in one or more embodiments, the steam output pipeline 51 is connected to the left side of the first-effect heat exchanger 211. After the medium in the steam output pipeline 51 passes through the first-effect heat exchanger 211, it enters the drain tank 56. The medium in the drain tank 56 is transmitted to the flash condensation tank 55 through the condensate output pipeline. The upper end on the right side of the first-effect heat exchanger 211 is connected to the first-effect evaporation tank 212 through a first-effect steam delivery pipe 216. The lower end of the first-effect evaporation tank 212 transmits the liquid at the bottom of the first-effect evaporation tank 212 to the lower end of the first-effect heat exchanger 211 through a first-effect circulation pipe 213. The medium to enter the first-effect evaporation tank 212 is further heated by the first-effect heat exchanger 211, so that some substances in the medium can evaporate. A steam pipeline 1 24 is further provided on the right side of the first-effect evaporation tank 212. A water pump is provided on the first-effect circulation pipe 213, and the medium can be circulated in the first-effect heat exchanger 211 and the first-effect evaporation tank 212 through the water pump.

[0037] As Figure 3 shown, in one or more embodiments, the steam pipeline 1 24 is connected to the left side of the second-effect heat exchanger 221. After the medium in the steam pipeline 1 24 passes through the second-effect heat exchanger 221, it enters the condensate tank 7. The medium in the condensate tank 7 is discharged through the condensate drainage pipeline. The upper end on the right side of the second-effect heat exchanger 221 is connected to the second-effect evaporation tank 222 through a second-effect steam delivery pipe 225. The lower end of the second-effect evaporation tank 222 transmits the liquid at the bottom of the second-effect evaporation tank 222 to the lower end of the second-effect heat exchanger 221 through a second-effect circulation pipe 223. The medium to enter the second-effect evaporation tank 222 is further heated by the second-effect heat exchanger 221, so that some substances in the medium can evaporate. A steam pipeline 2 25 is further provided on the right side of the second-effect evaporation tank 222. A water pump is provided on the second-effect circulation pipe 223, and the medium can be circulated in the second-effect heat exchanger 221 and the second-effect evaporation tank 222 through the water pump.

[0038] As Figure 3As shown, in one or more embodiments, the second steam pipeline 25 communicates with the left side of the triple-effect heat exchanger 231. After the medium in the second steam pipeline 25 passes through the triple-effect heat exchanger 231, it enters the condensate tank 7, and the medium in the condensate tank 7 is discharged through the condensate drainage pipeline. The upper end of the right side of the triple-effect heat exchanger 231 is communicated with the triple-effect evaporation tank 232 through the triple-effect steam delivery pipe 234. The lower end of the triple-effect evaporation tank 232 transmits the liquid at the bottom of the triple-effect evaporation tank 232 to the lower end of the triple-effect heat exchanger 231 through the triple-effect circulation pipe 233. The triple-effect heat exchanger 231 further heats the medium about to enter the triple-effect evaporation tank 232, enabling some substances in the medium to evaporate. An evaporation waste heat pipeline 81 is also provided on the right side of the triple-effect evaporation tank 232. A water pump is provided on the triple-effect circulation pipe 233, and through the water pump, the medium can be circulated in the triple-effect heat exchanger 231 and the triple-effect evaporation tank 232.

[0039] As Figure 3 shown, in one or more embodiments, level detection sensors are provided in both the second-effect evaporation tank 222 and the triple-effect evaporation tank 232. Through the level detection sensors, the liquid level of the medium in the corresponding evaporation tank can be detected. The first-effect circulation pipe 213 is communicated with the second-effect circulation pipe 223 through the first-effect delivery pipe 214 with a valve. When the valve on the first-effect delivery pipe 214 is opened, the medium in the first-effect evaporation tank 212 enters the second-effect circulation pipe 223 through the first-effect delivery pipe 214. The medium in the first-effect evaporation tank 212 enters the second-effect circulation pipe 223 through the first-effect delivery pipe 214. Through the second-effect circulation pipe 223 and the water pump, the medium is circulated in the second-effect heat exchanger 221 and the second-effect evaporation tank 222. By controlling the opening degree of the valve on the first-effect delivery pipe 214, the liquid level of the medium in the second evaporation tank 222 is always at a position approximately in the middle in the height direction of the second evaporation tank 222. The second evaporation tank 222 causes some substances in the medium to evaporate in the form of steam, and other substances are concentrated at the bottom of the second-effect evaporation tank 222.

[0040] As Figure 3 shown, in one or more embodiments, when the valve on the second-effect delivery pipe 224 is opened, the medium in the second-effect evaporation tank 222 enters the triple-effect circulation pipe 233 through the second-effect delivery pipe 224. Through the triple-effect circulation pipe 233 and the water pump, the medium is circulated in the triple-effect heat exchanger 231 and the triple-effect evaporation tank 232. By controlling the opening degree of the valve on the second-effect delivery pipe 224, the liquid level of the medium in the triple-effect evaporation tank 232 is always at a position approximately in the middle in the height direction of the triple-effect evaporation tank 232. The triple-effect evaporation tank 232 causes some substances in the medium to evaporate in the form of steam, and other substances are concentrated at the bottom of the triple-effect evaporation tank 232.

[0041] It should be noted that the liquid level of the medium in the corresponding evaporation tank can also be maintained by controlling the opening and closing of the valve. The valves on the corresponding pipelines can be electric or pneumatic valves. Those skilled in the art can select specific valve forms based on specific application scenarios.

[0042] As Figure 3 shown, in one or more embodiments, the wastewater inlet pipeline 41 sequentially passes through the first wastewater heat exchanger 44, the second wastewater heat exchanger 45, and finally communicates with the first-effect circulation pipe 213. A steam output branch 215 is provided on the steam output pipeline 51, and the steam output branch 215 communicates with the drain tank 56 after passing through the second wastewater heat exchanger. The steam output branch 215 and the wastewater inlet pipe are heat-exchanged and coupled in the first wastewater heat exchanger 44, and the medium in the wastewater inlet pipe is heated by the steam in the steam branch.

[0043] As Figure 1 and Figure 3 shown, in one or more embodiments, both ends of the cooling pipeline 31 are communicated with the cooling tower 32, and the cooling pipeline 31 passes through the cooling heat exchanger 34. A cooling circulation pump 33 is provided on the cooling pipeline 31, and the medium in the cooling pipeline 31 is circulated through cooling circulation.

[0044] As Figure 3 shown, the evaporation heat conduction pipeline 11 sequentially passes through the cooling heat exchanger 34 and the waste heat exchanger 82 along the direction of medium flow. The cooling pipeline 31 and the evaporation heat conduction pipeline 11 are heat-exchanged and coupled in the cooling heat exchanger 34. Further, the medium in the evaporation heat conduction pipeline 11 is cooled. The evaporation waste heat pipeline 81 is sequentially connected to the waste heat exchanger 82, the first wastewater heat exchanger 44, and the gas-liquid separator along the direction of medium flow. The evaporation heat conduction pipeline 11 and the evaporation waste heat pipeline 81 are heat-exchanged and coupled in the waste heat exchanger 82. Further, the medium in the evaporation heat conduction pipeline 11 is heated. The cooling heat exchanger 34 and the waste heat exchanger 82 are connected in series, and the medium in the evaporation heat conduction pipeline 11 is first cooled and then heated. The initial temperature of the medium in the evaporation heat conduction pipeline 11 is adjusted by the cooling tower 32 to avoid the efficiency reduction of the waste heat exchanger 82 caused by too high medium temperature.

[0045] As Figure 3 shown, in one or more embodiments, the gas-liquid separator 6 is provided with an open mouth and can discharge steam into the atmosphere. The open gas-liquid separator 6 separates the steam-water mixture in the evaporation waste heat pipeline 81 to prevent liquid water from entering the waste heat exchanger 82 and affecting the heat exchange efficiency. Of course, a fan or a pipeline with a fan can also be provided at the upper end of the gas-liquid separator 6. The lower end of the gas-liquid separator 6 is communicated with the condensate tank 7, and the medium in the gas-liquid separator 6 can enter the condensate tank 7. In one or more embodiments, a drain pipe is provided on the pipeline between the waste heat exchanger 82 and the first wastewater heat exchanger 44, and the medium enters the condensate tank 7 through the drain pipe.

[0046] As Figure 3 shown, in one or more embodiments, the make-up water pipeline 71 is connected to the condensate tank 7 for making up water into the condensate tank 7. The condensate drainage pipeline 72 is connected to the condensate tank 7 for draining the condensate tank 7. A valve and a water pump are provided on the condensate drainage pipeline 72, so as to control the drainage volume and drainage speed. In one or more embodiments, the concentrated liquid drainage pipeline 43 is respectively connected to the first-effect evaporator 21, the second-effect evaporator 22 and the third-effect evaporator 23, and is configured to drain the waste liquid in the first-effect evaporator 21, the second-effect evaporator 22 and the third-effect evaporator 23. The concentrated liquid drainage pipeline 43 is respectively connected to each effect evaporator and can empty the liquid inside each effect evaporator in an emergency. A concentrated liquid storage tank 46 is provided on the concentrated liquid drainage pipeline 43 to facilitate the storage of the concentrated wastewater.

[0047] As Figure 3 shown, in one or more embodiments, the wastewater inlet pipeline 41 and the evaporation waste heat pipeline 81 are heat exchange coupled in the first wastewater heat exchanger 44. A steam output branch 215 is provided on the steam output pipeline 51, and the steam output branch 215 and the wastewater inlet pipeline 41 are heat exchange coupled in the second wastewater heat exchanger; both the first wastewater heat exchanger 44 and the second wastewater heat exchanger 45 are configured to heat the wastewater in the wastewater inlet pipeline 41. Thus, the first wastewater heat exchanger 44 and the second wastewater heat exchanger 45 heat the wastewater in two stages to raise the temperature of the wastewater to above 60°C.

[0048] Those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0049] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A multi-effect heat pump steam generating device, characterized in that, Comprising: A heat pump system (1), which includes an evaporator and a condenser, and an evaporation heat conduction pipeline (11) communicating with the evaporator is heat exchange coupled with the refrigerant pipeline of the heat pump system (1) through the evaporator; A flash evaporation system (5), whose water circulation pipeline and the refrigerant pipeline of the heat pump system (1) are heat exchange coupled through the condenser, and which further includes a steam output pipeline (51) for transmitting steam and a condensate input pipeline (52) for transmitting liquid; A waste water supply system, which includes a waste water inlet pipeline (41) and a concentrated drainage pipeline (43); A multi-effect evaporation system (2), which is communicated with the steam output pipeline (51), the condensate input pipeline (52), the waste water inlet pipeline (41) and the concentrated drainage pipeline (43), and is arranged to be able to evaporate and concentrate waste water by using the temperature of steam; A waste heat reuse system, which includes a waste heat exchanger (82) and an evaporation waste heat pipeline (81) communicated with the multi-effect evaporation system (2), the evaporation waste heat pipeline (81) is arranged to be able to transmit steam, the evaporation waste heat pipeline (81) and the evaporation heat conduction pipeline (11) are heat exchange coupled through the waste heat exchanger (82), and the waste heat exchanger (82) is arranged to be able to heat the medium in the evaporation heat conduction pipeline (11).

2. The multi-effect heat pump steam generating device according to claim 1, characterized in that, The waste heat reuse system further includes a cooling tower (32), a cooling pipeline (31) and a cooling heat exchanger (34), both ends of the cooling pipeline (31) are communicated with the cooling tower (32), the evaporation heat conduction pipeline (11) sequentially passes through the cooling heat exchanger (34) and the waste heat exchanger (82) along the medium flow direction, and the evaporation heat conduction pipeline (11) is heat exchange coupled with the cooling pipeline (31) through the cooling heat exchanger (34).

3. The multi-effect heat pump steam generating device according to claim 1, characterized in that, The flash evaporation system (5) includes a flash evaporation tank (53) and a flash condensation tank (55); The flash evaporation tank (53) is communicated with the water circulation pipeline, the flash evaporation tank (53) is communicated with the steam output pipeline (51), and the flash evaporation tank (53) is arranged to be able to evaporate and vaporize the internal liquid medium; The flash condensation tank (55) is communicated with the water circulation pipeline, the flash condensation tank (55) is communicated with the condensate input pipeline (52), and the flash condensation tank (55) is arranged to be able to store the liquid medium and transmit the liquid medium to the condenser through the water circulation pipeline.

4. The multi-effect heat pump steam generating device according to claim 3, characterized in that, A spray head (531) is arranged in the flash evaporation tank (53), a flash evaporation steam port is arranged at the upper end of the flash evaporation tank (53), the flash evaporation steam port is communicated with the steam output pipeline (51), and a flash evaporation return water port is arranged at the lower end of the flash evaporation tank (53); A condensation water inlet is arranged at the upper end of the flash condensation tank (55), the condensation water inlet is communicated with the condensate input pipeline (52), and a condensation water return port is arranged at the lower end of the flash condensation tank (55); The water circulation pipeline includes a water circulation inlet pipeline (541), a first water circulation outlet pipeline (542), and a second water circulation outlet pipeline (543). The water circulation inlet pipeline (541) is communicated with a spray head (531) in the flash evaporation tank (53) for conveying a medium into the flash evaporation tank (53). The first water circulation outlet pipeline (542) is communicated with the flash evaporation water return port for conveying the medium at the bottom of the flash evaporation tank (53) to the condenser. The second water circulation outlet pipeline (543) is communicated with the condensation water return port for conveying the medium at the bottom of the flash condensation tank (55) to the condenser.

5. The multi-effect heat pump steam generating device according to claim 4, characterized in that, The flash evaporation tank (53) is provided with a heater (532), and the heater (532) is configured to be able to heat the flash evaporation tank (53).

6. The multi-effect heat pump steam generating device according to claim 4, wherein, A first drain pipe (5422) is provided on the first water circulation outlet pipeline (542), and a first drain valve (5423) is provided on the first drain pipe (5422); and / or A second drain pipe (5432) is provided on the second water circulation outlet pipeline (543), and a second drain valve (5433) is provided on the second drain pipe (5432); and / or A third drain pipe (5441) is communicated with the lower end of the flash condensation tank (55), and a third drain valve (5442) is provided on the third drain pipe (5441).

7. The multi-effect heat pump steam generating device according to claim 1, characterized in that, The multi-effect evaporation system (2) includes a first-effect evaporator (21), a second-effect evaporator (22), and a third-effect evaporator (23); The first-effect evaporator (21) is communicated with a steam output pipeline (51). The first-effect evaporator (21) is communicated with the second-effect evaporator (22) through a first steam pipeline (24). The second-effect evaporator (22) is communicated with the third-effect evaporator (23) through a second steam pipeline (25). The third-effect evaporator (23) is communicated with an evaporation waste heat pipeline (81).

8. The multi-effect heat pump steam generating device according to claim 7, characterized in that, The waste water supply system includes a first waste water heat exchanger (44) and a second waste water heat exchanger (45); The waste water inlet pipeline (41) is heat-exchanged and coupled with the evaporation waste heat pipeline (81) in the first waste water heat exchanger (44); A steam output branch (215) is provided on the steam output pipeline (51). The steam output branch (215) is heat-exchanged and coupled with the waste water inlet pipeline (41) in the second waste water heat exchanger (45). Both the first waste water heat exchanger (44) and the second waste water heat exchanger (45) are configured to be able to heat the waste water in the waste water inlet pipeline (41).

9. The multi-effect heat pump steam generating device according to claim 8, characterized in that, The multi-effect heat pump steam generating device further includes a gas-liquid separator (6). The gas-liquid separator (6) is provided with an open mouth. The evaporation waste heat pipeline (81) passing through the first waste water heat exchanger (44) is communicated with the gas-liquid separator (6).

10. The multi-effect heat pump steam generating device according to claim 7, characterized in that, The concentrated waste liquid discharge pipeline (43) is respectively communicated with the first-effect evaporator (21), the second-effect evaporator (22) and the third-effect evaporator (23), and is configured to be able to discharge the waste liquid in the first-effect evaporator (21), the second-effect evaporator (22) and the third-effect evaporator (23).

Images