CN113697882B - Heat pump water treatment system and working method - Google Patents
Heat pump water treatment system and working method Download PDFInfo
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- CN113697882B CN113697882B CN202110901108.8A CN202110901108A CN113697882B CN 113697882 B CN113697882 B CN 113697882B CN 202110901108 A CN202110901108 A CN 202110901108A CN 113697882 B CN113697882 B CN 113697882B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention discloses a heat pump water treatment system which comprises a refrigeration system, a raw water system and a condensation system. The refrigerant carries out gas-liquid two-phase circulating heat exchange in a traditional heat pump basic component (a condenser, a throttle valve, an evaporator and a compressor), raw material water is preheated before being distilled and concentrated and then enters the condensation evaporator to carry out heat exchange, an inner stirring mechanism is driven at the same time to strengthen the heat exchange between the raw material water and the refrigerant in a D-shaped copper pipe outside the condensation evaporator, steam generated by evaporation firstly passes through a water-cooling heat exchanger to preheat the raw material water and then enters an evaporation condenser to be condensed into condensate, and the condensate is stored in a water storage tank. Compared with the traditional heat pump water treatment device, the heat exchanger for recovering the condensation heat of the water vapor is additionally arranged, the control of a heat pump system is optimized, the water yield of the system can be improved, the energy consumption of unit water yield is reduced, and the water spraying stirring mechanism is arranged in the condensation evaporator, so that the heat exchange is enhanced, and the system performance is further optimized.
Description
Technical Field
The invention belongs to the technical field of water treatment and heat pumps, and particularly relates to a heat pump water treatment system and a working method thereof.
Background
The per capita water resource quantity of China is only 1/4 of the average level of the world, 2/3 of 600 cities in the country have insufficient water supply, and 1/6 of the cities are seriously lack of water. Under the background of more and more strict environmental requirements and energy crisis, in order to reach the sewage discharge standard, a large amount of energy is consumed to treat urban domestic wastewater, so that a technology which can be used for treating wastewater with high efficiency and energy conservation to obtain fresh water for life and can also be used for desalting seawater in coastal areas is urgently needed.
Distillation concentration is a well-known high-efficiency water treatment technology, waste water or seawater absorbs heat and is evaporated into concentrated solution and water vapor, and the water vapor is condensed to obtain clean distilled water. Mechanical vapor recompression and heat pump distillation are two energy-saving distillation and concentration technologies, wherein the former technology is to recover latent heat of low-temperature vapor by using a vapor compressor: the low-temperature steam is compressed to be changed into high-temperature steam, and then the condensation heat is used for water evaporation of the solution to be treated, and the latter utilizes the compression heat pump principle: the heat of water evaporation is provided by the condenser of the heat pump, and the water vapor is condensed by the evaporator.
Because the specific volume of the water vapor is large, the occupied area and the initial investment of equipment of the mechanical vapor recompression water treatment device are large, the popularization in the civil aspect is difficult, and the heat pump type water treatment technology is more convenient and is particularly suitable for small-sized civil water treatment devices. However, the existing heat pump water treatment device is low in energy efficiency, the utilization rate of heat released by the condenser for water evaporation is low, an auxiliary condenser is further arranged at the outlet of the condenser in order to balance the heat quantity difference between the condenser and the evaporator, the heat exchange quantity of the auxiliary condenser is difficult to control, and the system stability is poor.
Therefore, the development of a small-sized heat pump distillation type domestic wastewater treatment or seawater desalination technology which is more efficient, energy-saving and capable of working stably and suitable for civil use is urgently needed, the problem of water use of people, particularly people in water-deficient areas, is effectively solved, and the quality of life is improved.
Disclosure of Invention
The invention mainly aims to solve the problem that the water consumption of people and the traditional heat pump water treatment are low in energy efficiency, and provides an energy-saving and efficient heat pump water treatment system and a working method.
In order to achieve the purpose, the invention adopts the technical scheme that:
a heat pump water treatment system comprises a condensation evaporator 1, a throttle valve 2, an evaporative condenser 3, a compressor 4, a first water-cooled heat exchanger 5, a vacuum pump 6, a raw material water pump 7 and a second water-cooled heat exchanger 8; the condensation evaporator 1 is a sleeved inner and outer tank structure body, a gap for arranging a heat exchange coil 1d is arranged between the inner tank and the outer tank, and a filter screen 1e, a rotary water spraying device 1a, a spray pipe 1b communicated with the rotary water spraying device 1a and a scraper plate 1c are sequentially arranged in the inner tank from top to bottom; the outlet of the compressor 4 is attached to the inlet A1 of the heat exchange coil 1d in the gap of the condensing evaporator 1 through pipeline connection, the outlet A2 of the heat exchange coil 1d is connected with the inlet B1 of the heat exchange tube in the evaporative condenser 3 through a throttle valve 2, and the outlet B2 of the heat exchange tube at the top of the evaporative condenser 3 is connected to the inlet of the compressor 4 through a pipeline; the outlet at the top end of the condensation evaporator 1 is divided into two paths, one path is communicated with the atmosphere through a first valve 12 by a vacuum pump 6, the other path is connected with an inlet C1 at the upper part of a first water-cooling heat exchanger 5 by a third valve 14, and an outlet C2 at the upper part of the first water-cooling heat exchanger 5 is connected with a steam inlet of an evaporation condenser 3; an outlet B3 at the top of the evaporative condenser 3 is connected with an inlet of a vacuum pump 6 through a second valve 13; two paths of raw material water are connected, wherein one path of raw material water is connected to the lower inlet of an electromagnetic three-way valve 19 through a pipeline, the top outlet of the electromagnetic three-way valve 19 is connected to the lower inlet D1 of the first water-cooled heat exchanger 5, and the other path of raw material water is connected to the upper inlet E1 of the second water-cooled heat exchanger 8 through a first raw material water valve 18; the middle outlet of the electromagnetic three-way valve 19 is connected to a pipeline of a lower outlet D2 of the first water-cooling heat exchanger 5 through a pipeline; the outlet at the bottom of the condensation evaporator 1 is divided into two paths, one path is connected with the inlet F1 at the lower part of the second water-cooling heat exchanger 8 through a blowoff valve 22, the outlet F2 at the lower part of the second water-cooling heat exchanger 8 is communicated with the outside, the other path is divided into two paths after passing through a third raw material water valve 21, the other path is connected with the inlet of the rotary water spraying device 1a through a raw material water pump 7 and a second raw material water valve 20, and the other path is connected to a pipeline after the outlet D2 at the lower part of the first water-cooling heat exchanger 5 is converged with the outlet E2 at the upper part of the second water-cooling heat exchanger 8.
Preferably, the bottom outlet of the evaporative condenser 3 is also connected with the middle inlet G2 of the ejector 11 through a fourth valve 15; an outlet G3 at the upper part of the ejector 11 is connected with an inlet H1 at the top part of a water storage tank 9, and an outlet at the bottom part of the water storage tank 9 is connected with an inlet G1 at the lower part of the ejector 11 through a water return pump 10 and a water return valve 16 in sequence; the upper outlet H2 of the water storage tank 9 is connected with the atmosphere through an exhaust valve 17.
Further preferably, heat exchange coil 1d sets up in the bottom of condensation evaporimeter 1 and body hypomere clearance, wherein heat exchange coil 1d that sets up in body hypomere clearance is the heliciform, and heat exchange coil 1d that sets up in the bottom clearance is double-barrelled clockwise or anticlockwise from inside to outside rotation, is "mosquito-repellent incense" form.
Preferably, the cross section of the heat exchange coil 1D is D-shaped, and the flat side of the heat exchange coil is attached to the outer wall of the inner tank of the condensation evaporator 1.
Further preferably, the gap is further filled with a heat insulating material.
Further preferably, the rotary water spraying device 1a is fixed on the upper part of the inner tank of the condensation evaporator 1 through a bracket, the outlet on the lower part of the rotary water spraying device 1a is communicated with the spray pipe 1b, and the inlet on the upper part of the rotary water spraying device 1a is connected with the outlet of the second raw material water valve 20 arranged outside the tank.
More preferably, the nozzle 1b is composed of a main pipe and a plurality of layers of branch pipes communicated with the main pipe, wherein each layer of branch pipes is formed, and the main pipe is rotatably and movably connected with the lower outlet of the rotary water spraying device 1a.
The main pipe is vertically communicated with each branch pipe, and the distances between the branch pipes are equal; the tail end of the branch pipe is provided with a nozzle, the outlet of the nozzle faces the circumferential direction of the inner tank wall, and the nozzle is in a circular gradually-reduced nozzle shape.
Preferably, the scraper 1c is a quadrilateral or circular plate with or without a hole, is fixedly connected to the main pipe between two adjacent layers of branch pipes by threads, and is arranged in a staggered manner.
A working method of a heat pump water treatment system comprises the following specific contents and steps:
before the system runs, the first valve 12, the second valve 13 and the starting vacuum pump 6 are opened, the system is vacuumized, the other valves are closed, and the vacuum pump 6, the first valve 12 and the second valve 13 are closed after the vacuum degree meets the set requirement; when the system starts to operate, the first raw material water valve 18, the electromagnetic three-way valve 19 and the second raw material water valve 20 are opened, and the raw material water pump 7 is started, so that the raw material water volume of the branch pipe with the lowest immersion spray pipe 1b is stored in the condensing evaporator 1; then starting the compressor 4, the refrigerant gas is compressed by the compressor 4 and then changed into high-pressure high-temperature gaseous refrigerant to be sent into the heat exchange coil 1d of the condensation evaporator 1, the refrigerant enters the throttling valve 2 after being released and condensed in the heat exchange coil 1d to be throttled and decompressed into low-temperature low-pressure refrigerant, the refrigerant returns to the compressor 4 after being absorbed and evaporated in the heat exchange coil in the evaporation condenser 3 to be compressed, and the reciprocating circulation is carried out;
in the operation process of the system, raw material water flows into the first water-cooling heat exchanger 5 through the electromagnetic three-way valve 19 to absorb steam heat for temperature rise, the raw material water is pumped into the condensation evaporator 1 by the raw material water pump 7 after coming out of the first water-cooling heat exchanger 5, and the opening degree of the electromagnetic three-way valve 19 is adjusted according to the suction temperature of the compressor 4 to control the amount of the raw material water entering the first water-cooling heat exchanger 5; raw material water in the condensation evaporator 1 absorbs heat released by a refrigerant to generate steam, the steam is filtered by a filter screen 1e, enters the first water-cooling heat exchanger 5 through the third valve 14 to preheat raw material water flowing in through the electromagnetic three-way valve 19, then enters the evaporation condenser 3 to release heat for condensation, and the released heat is used for evaporation of the refrigerant; the raw material water is changed into concentrated raw material water after evaporating part of water and is stored in an inner tank of the condensation evaporator 1, and condensate generated by condensing steam is stored at the bottom of the evaporation condenser 3;
after the refrigerant circulates for a period of time, blowdown treatment is carried out, the blowdown valve 22 and the first raw material water valve 18 are opened, raw material water is divided into two parts, one part absorbs waste heat of concentrated raw material water through the second water-cooled heat exchanger 8, the other part absorbs waste heat of steam through the first water-cooled heat exchanger 5, two paths of raw material water are converged in front of an inlet of the raw material water pump 7 and pumped into the condensation evaporator 1, and the first raw material water valve 18 and the blowdown valve 22 are controlled to start and stop according to the concentration and the liquid level height of the concentrated raw material water in the condensation evaporator 1; and for the condensate part, when the system runs stably and certain condensate is stored in the evaporative condenser 3, the fourth valve 15, the water return valve 16 and the exhaust valve 17 are opened, the water return pump 10 is started, the condensate is ejected and discharged to the water storage tank 9 by the ejector 11, and the start and stop of the water return pump 10 are controlled according to the liquid level height of the condensate in the evaporative condenser 3.
Further preferably, the opening of the electromagnetic three-way valve 19 in the direction of connecting the inlet D1 of the first water-cooled heat exchanger 5 and the temperature of the outlet B2 of the evaporative condenser 3 are in a direct proportion regulation relationship; the start and stop of the water return pump 10 are controlled according to the liquid level height of condensed water in the evaporative condenser 3; when the condensate is at the lower liquid level, the backwater pump 10 is turned off, and when the condensate is at the upper liquid level, the backwater pump 10 is turned on.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the invention, the first water-cooling heat exchanger 5 and the second water-cooling heat exchanger 8 are used for replacing an auxiliary condenser of a traditional heat pump water treatment system, the opening degree of the electromagnetic three-way valve 19 is adjusted through the temperature of the outlet B2 at the upper part of the evaporative condenser 3, the problem that the heat exchange quantity of the auxiliary condenser is difficult to control is solved, and meanwhile, the waste heat of steam and concentrated raw material water recovered by the first water-cooling heat exchanger 5 and the second water-cooling heat exchanger 8 is used for preheating the raw material water, so that the control of the heat pump system is optimized, the water yield of the system is improved, and the energy consumption of unit water production is reduced. A water spraying and stirring mechanism is arranged in the condensation evaporator, so that the disturbance of raw material water is enhanced, the heat exchange is enhanced, and the negative pressure in the tank is more favorably maintained compared with a stirring mode driven by an external motor; set up the D type heat transfer coil 1D of attached condensing evaporator 1 inner tank outer wall simultaneously, increase heat transfer area, further optimize system performance.
Drawings
Fig. 1 is a schematic diagram of a heat pump water treatment system according to an embodiment of the present invention.
The reference numbers in the figures illustrate: 1. a condensation evaporator, 1a rotary water spraying device, 1b spray pipe, 1c scraper, 1d heat exchange coil, 1e filter screen, 2 throttle valve, 3 evaporative condenser 4, a compressor, 5, a first water-cooling heat exchanger, 6, a vacuum pump, 7, a raw material water pump, 8, a second water-cooling heat exchanger, 9, a water storage tank 10, a water return pump, 11, an ejector, 12, a first valve, 13, a second valve, 14, a third valve, 15, a fourth valve, 16, a water return valve, 17, an exhaust valve, 18, a first raw material water valve, 19, an electromagnetic three-way valve, 20, a second raw material water valve, 21, a third raw material water valve, 22 and a blowdown valve.
Fig. 2 is a schematic three-dimensional structure diagram of the water-spraying stirring mechanism.
Fig. 3 is a plan view of the water-spraying stirring mechanism.
Fig. 4 is a schematic diagram of a three-dimensional structure of a heat exchange coil.
Figure 5 is a cross-sectional view of a heat exchange coil tube.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the heat pump water treatment system includes: the system comprises a condensation evaporator 1, a throttle valve 2, an evaporative condenser 3, a compressor 4, a first water-cooled heat exchanger 5, a vacuum pump 6, a raw material water pump 7 and a second water-cooled heat exchanger 8; the condensation evaporator 1 is a sleeved inner and outer tank structure body, a gap for arranging a heat exchange coil 1d is arranged between the inner tank and the outer tank, and a filter screen 1e, a rotary water spraying device 1a, a spray pipe 1b communicated with the rotary water spraying device 1a and a scraper plate 1c are sequentially arranged in the inner tank from top to bottom; the outlet of the compressor 4 is attached to the inlet A1 of the heat exchange coil 1d in the gap of the condensing evaporator 1 through pipeline connection, the outlet A2 of the heat exchange coil 1d is connected with the inlet B1 of the heat exchange tube in the evaporative condenser 3 through a throttle valve 2, and the outlet B2 of the heat exchange tube at the top of the evaporative condenser 3 is connected to the inlet of the compressor 4 through a pipeline; the outlet at the top end of the condensation evaporator 1 is divided into two paths, one path is communicated with the atmosphere through a first valve 12 by a vacuum pump 6, the other path is connected with an inlet C1 at the upper part of a first water-cooling heat exchanger 5 by a third valve 14, and an outlet C2 at the upper part of the first water-cooling heat exchanger 5 is connected with a steam inlet of an evaporation condenser 3; the outlet B3 at the top of the evaporative condenser 3 is connected with the inlet of the vacuum pump 6 through a second valve 13. The vacuum pump 6, the first valve 12 and the second valve 13 are only opened when the system is vacuumized to maintain the negative pressure of the system, and are all closed during the operation of the system.
Raw material water is divided into two paths, one path is connected to the lower inlet of an electromagnetic three-way valve 19 through a pipeline, the top outlet of the electromagnetic three-way valve 19 is connected to the lower inlet D1 of the first water-cooled heat exchanger 5, and the other path is connected to the upper inlet E1 of the second water-cooled heat exchanger 8 through a first raw material water valve 18; an outlet in the middle of the electromagnetic three-way valve 19 is connected to a pipeline of an outlet D2 in the lower part of the first water-cooled heat exchanger 5 through a pipeline; the bottom outlet of the condensation evaporator 1 is divided into two paths, one path is connected with the lower inlet F1 of the second water-cooling heat exchanger 8 through a blow-down valve 22, the lower outlet F2 of the second water-cooling heat exchanger 8 is communicated with the outside, the other path is divided into two paths through a third raw material water valve 21, one path is connected with the inlet of the rotary water spraying device 1a through a raw material water pump 7 through a second raw material water valve 20, and the other path is connected to a pipeline after the lower outlet D2 of the first water-cooling heat exchanger 5 and the upper outlet E2 of the second water-cooling heat exchanger 8 are converged. The first water-cooled heat exchanger 5 and the second water-cooled heat exchanger 8 are used for replacing an auxiliary condenser of a traditional heat pump water treatment system, the problem that the heat exchange quantity of the auxiliary condenser is difficult to control is solved, and meanwhile, raw water is preheated.
The bottom outlet of the evaporative condenser 3 is also connected with the middle inlet G2 of the ejector 11 through a fourth valve 15; an outlet G3 at the upper part of the ejector 11 is connected with an inlet H1 at the top part of a water storage tank 9, and an outlet at the bottom part of the water storage tank 9 is connected with an inlet G1 at the lower part of the ejector 11 through a water return pump 10 and a water return valve 16 in sequence; an outlet H2 at the upper part of the water storage tank 9 is connected with the atmosphere through an exhaust valve 17, so that non-condensable gas can be discharged in time.
As shown in fig. 2, the nozzle 1b is composed of a main pipe and a plurality of layers of branch pipes communicated with the main pipe, each layer of branch pipes is composed of a plurality of layers of branch pipes, wherein the main pipe is rotatably and movably connected with the lower outlet of the rotary water spraying device 1a, and the main pipe is vertically communicated with each branch pipe and fixed by threads, so that the device can flexibly install the number of the branch pipes and arrange the size of the interval which is not stopped according to different use scenes to form matching, and is also convenient to maintain and replace; the tail ends of the branch pipes are provided with nozzles, the outlets of the nozzles face the circumferential direction of the inner tank wall, so that a centripetal force is generated to enable the longitudinal main pipe to generate thrust required by rotation, and the nozzles are in the shape of circular reducing nozzles, so that the stability of the circumferential force is kept, and the main pipe can stably rotate; the scraper blades 1c are quadrilateral or circular plate-shaped bodies with or without holes, are fixedly connected to the main pipe between the two adjacent layers of branch pipes by threads and are arranged in a staggered manner, the scraper blades 1c are determined by the number of the transverse branch pipes in the spray pipe 1b, and the scraper blades 1c can enhance the disturbance of raw material water in the condensation evaporator 1, so that the heat exchange efficiency is improved.
The filter screen 1e is arranged above the water spraying device 1a and used for filtering impurities in the steam, so that condensate generated after the steam is condensed by heat absorption is relatively pure, and the water quality is ensured.
The rotary water spraying device 1a is fixed on the upper part of the inner tank of the condensation evaporator 1 through a support in a welding manner, as shown in the top view of the water spraying and stirring mechanism in fig. 3, the lower outlet of the rotary water spraying device 1a is rotatably and movably connected with the longitudinal main pipe of the spray pipe 1b, the distance between the branch pipes of the spray pipe 1b is equal, and the number of the branch pipes is determined according to the set water level height; an inlet at the upper part of the rotary water spraying device 1a is connected with an outlet of a second raw material water valve 20 arranged outside the tank.
The heat exchange coil 1d is arranged in the gap between the bottom of the condensation evaporator 1 and the lower section of the body, wherein the heat exchange coil 1d arranged in the gap between the lower section of the body is spiral, as shown in fig. 4, the heat exchange coil 1d arranged in the gap between the bottom is a double-tube coil which rotates clockwise or anticlockwise from inside to outside and is shaped like a mosquito-repellent incense, the whole heat exchange coil 1d is dense at the bottom and sparse at two sides, when the bottom coil is dense, the condition that the temperature of the bottom of raw material water is higher than that of the upper part is easily caused, and the raw material water is easily rolled to improve the heat exchange efficiency; as shown in fig. 5, the cross section of the heat exchange coil 1D is D-shaped, and the flat side of the heat exchange coil is tightly attached to the outer wall of the inner tank of the condensation evaporator 1, compared with a pipe with a circular cross section, the cross section of the heat exchange coil 1D used in the invention increases the heat exchange area, which is beneficial to accelerating the heat exchange rate; and the gap is also filled with a heat insulation material, so that heat loss is avoided.
A working method of a heat pump water treatment system comprises the following specific contents and steps:
before the system runs, the first valve 12, the second valve 13 and the starting vacuum pump 6 are opened, the system is vacuumized, the other valves are closed, and the vacuum pump 6, the first valve 12 and the second valve 13 are closed after the vacuum degree meets the set requirement; when the system starts to operate, the first raw material water valve 18, the electromagnetic three-way valve 19 and the second raw material water valve 20 are firstly opened, and the raw material water pump 7 is started, so that the raw material water quantity of the branch pipe with the lowest immersed spray pipe 1b is stored in the condensation evaporator 1, and the treated raw material water can be seawater or domestic sewage and the like; then starting the compressor 4, the refrigerant gas is compressed by the compressor 4 and then changed into high-pressure high-temperature gaseous refrigerant which is sent into the heat exchange coil 1d of the condensation evaporator 1, the refrigerant enters the throttle valve 2 after being heated and condensed in the heat exchange coil 1d and is throttled and depressurized to be changed into low-temperature low-pressure refrigerant, the refrigerant returns to the compressor 4 after being absorbed and evaporated in the heat exchange coil in the evaporation condenser 3 and is compressed, and the refrigerant is circulated in a reciprocating way;
in the operation process of the system, raw material water flows into the first water-cooling heat exchanger 5 through the electromagnetic three-way valve 19 to absorb steam heat for temperature rise, the raw material water is pumped into the condensation evaporator 1 by the raw material water pump 7 after coming out of the first water-cooling heat exchanger 5, and the opening degree of the electromagnetic three-way valve 19 is adjusted according to the suction temperature of the compressor 4 to control the amount of the raw material water entering the first water-cooling heat exchanger 5; raw material water in the condensation evaporator 1 absorbs heat released by a refrigerant to generate steam, the steam is filtered by a filter screen 1e, enters the first water-cooling heat exchanger 5 through the third valve 14 to preheat raw material water flowing in through the electromagnetic three-way valve 19, then enters the evaporation condenser 3 to release heat for condensation, and the released heat is used for evaporation of the refrigerant; after partial water content of the raw material water is evaporated, the raw material water is changed into concentrated raw material water and stored in an inner tank of the condensation evaporator 1, and condensate generated by condensing steam is stored at the bottom of the evaporation condenser 3;
after the refrigerant circulates for a period of time, blowdown treatment is carried out, the blowdown valve 22 and the first raw material water valve 18 are opened, raw material water is divided into two parts, one part absorbs waste heat of concentrated raw material water through the second water-cooled heat exchanger 8, the other part absorbs waste heat of steam through the first water-cooled heat exchanger 5, two paths of raw material water are converged in front of an inlet of the raw material water pump 7 and are pumped into the condensation evaporator 1, and the first raw material water valve 18 and the blowdown valve 22 are controlled to be started and stopped according to the concentration and the liquid level height of the concentrated raw material water in the condensation evaporator 1; and for the condensate part, when the system runs stably and certain condensate is stored in the evaporative condenser 3, the fourth valve 15, the water return valve 16 and the exhaust valve 17 are opened, the water return pump 10 is started, the condensate is ejected and discharged to the water storage tank 9 by the ejector 11, and the start and stop of the water return pump 10 are controlled according to the liquid level height of the condensate in the evaporative condenser 3.
Further preferably, the opening degree of the electromagnetic three-way valve 19 in the direction of connecting the inlet D1 of the first water-cooled heat exchanger 5 and the temperature of the outlet B2 of the evaporative condenser 3 are in a direct proportional regulation relationship; the start and stop of the water return pump 10 are controlled according to the liquid level height of condensed water in the evaporative condenser 3; when the condensate is at the lower liquid level, the backwater pump 10 is turned off, and when the condensate is at the upper liquid level, the backwater pump 10 is turned on.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, and it is intended that the scope of the invention be limited only by the claims appended hereto.
Claims (4)
1. A heat pump water treatment system is characterized by comprising a condensation evaporator (1), a throttle valve (2), an evaporation condenser (3), a compressor (4), a first water-cooling heat exchanger (5), a vacuum pump (6), a raw material water pump (7) and a second water-cooling heat exchanger (8); the condensation evaporator (1) is a sleeved inner and outer tank structure body, a gap for arranging a heat exchange coil (1 d) is arranged between the inner tank and the outer tank, and a filter screen (1 e), a rotary water spraying device (1 a), a spray pipe (1 b) communicated with the rotary water spraying device (1 a) and a scraper (1 c) are sequentially arranged in the inner tank from top to bottom; the outlet of the compressor (4) is attached to the inlet A1 of a heat exchange coil (1 d) in the gap of the condensing evaporator (1) through pipeline connection, the outlet A2 of the heat exchange coil (1 d) is connected with the inlet B1 of a heat exchange tube in the evaporative condenser (3) through a throttle valve (2), and the outlet B2 of the heat exchange tube at the top of the evaporative condenser (3) is connected to the inlet of the compressor (4) through a pipeline; the outlet at the top end of the condensation evaporator (1) is divided into two paths, one path is communicated with the atmosphere through a first valve (12) and a vacuum pump (6), the other path is connected with an inlet C1 at the upper part of the first water-cooling heat exchanger (5) through a third valve (14), and an outlet C2 at the upper part of the first water-cooling heat exchanger (5) is connected with a steam inlet of the evaporation condenser (3); an outlet B3 at the top of the evaporative condenser (3) is connected with an inlet of a vacuum pump (6) through a second valve (13); raw material water is divided into two paths, one path is connected to the lower inlet of an electromagnetic three-way valve (19) through a pipeline, the top outlet of the electromagnetic three-way valve (19) is connected to the lower inlet D1 of a first water-cooling heat exchanger (5), and the other path is connected to the upper inlet E1 of a second water-cooling heat exchanger (8) through a first raw material water valve (18); an outlet in the middle of the electromagnetic three-way valve (19) is connected to a pipeline of an outlet D2 in the lower part of the first water-cooling heat exchanger (5) through a pipeline; the bottom outlet of the condensation evaporator (1) is divided into two paths, one path is connected with the lower inlet F1 of the second water-cooling heat exchanger (8) through a blow-down valve (22), the lower outlet F2 of the second water-cooling heat exchanger (8) is communicated with the outside, the other path is divided into two paths through a third raw material water valve (21), one path is connected with the inlet of the rotary water spraying device (1 a) through a raw material water pump (7) through a second raw material water valve (20), and the other path is connected to a pipeline after the lower outlet D2 of the first water-cooling heat exchanger (5) and the upper outlet E2 of the second water-cooling heat exchanger (8) are converged;
the bottom outlet of the evaporative condenser (3) is also connected with the middle inlet G2 of the ejector (11) through a fourth valve (15); an outlet G3 at the upper part of the ejector (11) is connected with an inlet H1 at the top part of a water storage tank (9), and an outlet at the bottom part of the water storage tank (9) is connected with an inlet G1 at the lower part of the ejector (11) sequentially through a water return pump (10) and a water return valve (16); an outlet H2 at the upper part of the water storage tank (9) is connected with the atmosphere through an exhaust valve (17);
the heat exchange coil (1 d) is arranged in the gap between the bottom of the condensation evaporator (1) and the lower section of the body, wherein the heat exchange coil (1 d) arranged in the gap of the lower section of the body is spiral, and the heat exchange coil (1 d) arranged in the gap of the bottom is a double-pipe mosquito-repellent incense which rotates clockwise or anticlockwise from inside to outside;
the cross section of the heat exchange coil (1D) is D-shaped, and the flat side of the heat exchange coil is tightly attached to the outer wall of the inner tank of the condensation evaporator (1);
the gap is also filled with a heat insulation material;
the rotary water spraying device (1 a) is fixed on the upper part of an inner tank of the condensation evaporator (1) through a support, an outlet at the lower part of the rotary water spraying device (1 a) is communicated with the spray pipe (1 b), and an inlet at the upper part of the rotary water spraying device (1 a) is connected with an outlet of a second raw material water valve (20) arranged outside the tank;
the spray pipe (1 b) consists of a main pipe and a plurality of layers communicated with the main pipe, and each layer is composed of a plurality of branch pipes, wherein the main pipe is rotatably and movably connected with the lower outlet of the rotary water spraying device (1 a), the main pipe is vertically communicated with each branch pipe, and the intervals between the branch pipes are equal; the tail end of the branch pipe is provided with a nozzle, the outlet of the nozzle faces the circumferential direction of the inner tank wall, and the nozzle is in a circular gradually-reduced nozzle shape.
2. A heat pump water treatment system according to claim 1, wherein said scrapers (1 c) are rectangular or circular plates with or without holes, and are fixedly connected to the main pipe between two adjacent layers of branch pipes by screw threads, and are arranged in a staggered manner.
3. A method of operating a heat pump water processing system according to any one of claims 1-2, characterized by the steps and contents of:
before the system runs, a first valve (12), a second valve (13) and a starting vacuum pump (6) are opened, the system is vacuumized, the other valves are closed, and the vacuum pump (6), the first valve (12) and the second valve (13) are closed after the vacuum degree reaches a set requirement; when the system starts to operate, a first raw material water valve (18), an electromagnetic three-way valve (19) and a second raw material water valve (20) are opened, and a raw material water pump (7) is started, so that the raw material water quantity of the branch pipe with the lowest immersed spray pipe (1 b) is stored in the condensing evaporator (1); then starting the compressor (4), the refrigerant gas is compressed by the compressor (4) and then changed into high-pressure high-temperature gaseous refrigerant which is sent into the heat exchange coil (1 d) of the condensation evaporator (1), the refrigerant enters the throttle valve (2) after being heated and condensed in the heat exchange coil (1 d) to be throttled and depressurized to be changed into low-temperature low-pressure refrigerant, the refrigerant returns to the compressor (4) after being absorbed, evaporated and heated in the heat exchange coil in the evaporation condenser (3) to be compressed, and the refrigerant is circulated in a reciprocating way;
in the running process of the system, raw material water flows into the first water-cooling heat exchanger (5) through the electromagnetic three-way valve (19) to absorb steam heat for heating, is pumped into the condensation evaporator (1) by the raw material water pump (7) after coming out of the first water-cooling heat exchanger (5), and the opening of the electromagnetic three-way valve (19) is adjusted according to the air suction temperature of the compressor (4) to control the amount of the raw material water entering the first water-cooling heat exchanger (5); raw material water in the condensation evaporator (1) absorbs heat released by a refrigerant to generate steam, the steam is filtered by a filter screen (1 e), enters a first water-cooling heat exchanger (5) through a third valve (14) to preheat raw material water flowing in through an electromagnetic three-way valve (19), then enters an evaporation condenser (3) to release heat for condensation, and the released heat is used for evaporation of the refrigerant; after partial water content of the raw material water is evaporated, the raw material water is changed into concentrated raw material water and stored in an inner tank of the condensation evaporator (1), and condensate generated by condensing steam is stored at the bottom of the evaporation condenser (3);
after the refrigerant circulates for a period of time, blowdown treatment is carried out, a blowdown valve (22) and a first raw material water valve (18) are opened, raw material water is divided into two parts at this time, one part absorbs waste heat of concentrated raw material water through a second water-cooling heat exchanger (8), the other part absorbs steam waste heat through a first water-cooling heat exchanger (5), two paths of raw material water are converged in front of an inlet of a raw material water pump (7) and are pumped into a condensation evaporator (1), and the first raw material water valve (18) and the blowdown valve (22) carry out start-stop control according to the concentration and the liquid level height of the concentrated raw material water in the condensation evaporator (1); aiming at the condensate part, when the system runs stably and certain condensate is stored in the evaporative condenser (3), the fourth valve (15), the water return valve (16) and the exhaust valve (17) are opened, the water return pump (10) is started, the condensate is ejected and discharged to the water storage tank (9) by the ejector (11), and the start and stop of the water return pump (10) are controlled according to the liquid level height of the condensate in the evaporative condenser (3).
4. A heat pump water treatment system operation method according to claim 3, wherein the electromagnetic three-way valve (19) connects an opening degree of the first water-cooled heat exchanger (5) in a direction of an inlet D1 thereof in a proportional adjustment relationship with a temperature of an outlet B2 of the evaporative condenser (3); the start and stop of the water return pump (10) are controlled according to the liquid level height of condensed water in the evaporative condenser (3); when the condensate is at the lower liquid level, the water return pump (10) is closed, and when the condensate is at the upper liquid level, the water return pump (10) is opened.
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Effective date of registration: 20230731 Address after: A6, Suhong Industrial Building, No. 81 Suhong West Road, Suzhou Industrial Park, Jiangsu Province, 215127 Patentee after: Yikuaipu (Suzhou) Thermal Energy Environmental Protection Equipment Co.,Ltd. Address before: 212003, No. 2, Mengxi Road, Zhenjiang, Jiangsu Patentee before: JIANGSU University OF SCIENCE AND TECHNOLOGY |
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