CN105036226B - A kind of Trans-critical cycle air-conditioning of Winter-summer dual purpose and flat flow desalinization co-generation system - Google Patents

Abstract

The invention discloses a transcritical air conditioner and advection type seawater desalination combined production system for both winter and summer, including a transcritical air conditioner with a refrigeration cycle unit and a heating cycle system and an advection low temperature multi-effect distillation device; the heating cycle The heating part of the unit includes an indoor heat exchanger and an air cooler that compresses the refrigerant for heating by the compressor, and the heating cycle unit and the refrigeration cycle unit share the same air cooler; the parallel flow low-temperature multiple-effect distillation device includes multiple effect distillation unit, a fresh water collection pipeline for collecting liquid fresh water, and a concentrated waste water discharge pipe for collecting concentrated seawater at the end. The air cooler is divided into at least two sections along the flow direction of the refrigerant. The air cooler is sequentially connected to the corresponding effect distillation unit as an air-cooling module; the invention improves the utilization rate of the low-temperature multi-effect distillation device for the exhaust heat generated by the transcritical air conditioner and the fresh water yield of the low-temperature multi-effect distillation device, and can be used in both winter and summer. It can produce water every season, and has the function of cooling or heating, and has high practicability.

Description

A dual-purpose transcritical air-conditioning and advection seawater desalination cogeneration system for both winter and summer

technical field

The invention relates to seawater desalination technology, in particular to a transcritical air-conditioning and advection type seawater desalination cogeneration system for both winter and summer.

Background technique

In recent years, household air conditioners in my country have become increasingly popular in cities. From 2001 to 2013, the output of my country's household air conditioner market increased at a compound annual growth rate of 17.29%. In 2013, the output of my country's household air conditioners was 130.57 million units. In summer, when the household air conditioner is used for cooling, its main function is to cool down the room, and the condensation heat of the air conditioning system is directly discharged into the atmosphere without being utilized. When the refrigeration unit operates under air-conditioning conditions, it emits a large amount of condensation heat to the atmosphere, usually the condensation heat can reach 1.15 to 1.3 times the cooling capacity. A large amount of condensation heat is directly discharged into the atmosphere, which is lost in vain, resulting in a large waste of energy. The emission of these heat increases the temperature of the surrounding environment, causing serious environmental heat pollution. Therefore, in order to save energy and protect the environment, waste heat from air conditioners Recycling becomes necessary.

Transcritical air conditioners, that is, air conditioners that use carbon dioxide, nitrous oxide and other substances as refrigerants, have a core type of transcritical refrigeration cycle. The main components of a transcritical refrigeration cycle are the regenerator, compressor, evaporator, air cooler, and expansion device. The working principle of the whole system is that the low-temperature and low-pressure working medium is compressed into high-temperature and high-pressure gas by the compressor. The high-temperature and high-pressure gas enters the air cooler for heat exchange and cooling. The low-temperature and low-pressure working fluid is heat-exchanged. The high-temperature and high-pressure working medium continues to be cooled, while the low-temperature and low-pressure working medium becomes superheated. The refrigerant enters the evaporator to exchange heat with the air, and then enters the compressor for compression, forming a cycle. The exothermic process of the working fluid in the air cooler is a non-phase-change exothermic process with a large temperature glide, usually from about 100 °C to 35 °C, and the heat is released approximately linearly.

Water is the basic need to maintain life and health. Although 71% of the earth is covered by water, fresh water resources are extremely limited. At present, the world's fresh water resources only account for 2.5% of its total water volume, of which more than 70% are frozen in the ice sheets of the Antarctic and Arctic, plus the difficult-to-use alpine glaciers and permafrost snow, 86% of the fresh water resources are difficult use. The fresh water resources that humans can really use are part of rivers, lakes and groundwater, which only account for 0.26% of the total water on the earth. At present, 1/6 of the world's population, about 1 billion people, lack water. Experts estimate that by 2025, the world's water-deficient population will exceed 2.5 billion. And due to the distribution of fresh water on the earth, the unevenness in time and region, and the pollution of water sources by human beings, the availability of fresh water is not only limited, but also sharply reduced. The problem of water shortage has become a difficult problem of social sustainable development that the whole world is facing. Under such severe water use forms and realistic conditions, the proposal and application of seawater desalination has great practical significance.

Seawater desalination refers to the process of removing excess salt and minerals in water to obtain fresh water. Its realization technologies mainly include distillation, reverse osmosis, electrodialysis, and freezing. Distillation methods include multiple-effect distillation, multi-stage flash distillation, membrane distillation, solar distillation, etc. The principle of the distillation method is to vaporize seawater and condense water vapor to obtain fresh water. It has the advantages of simple and reliable equipment, good anti-fouling performance, easy large-scale, high water production, and low-grade heat energy. However, this method requires external heat energy. , and the latent heat of vaporization of water is relatively large, so the energy consumption is relatively high.

At present, the distillation technology is mature, and the low-temperature multi-effect distillation seawater desalination technology is a promising seawater desalination technology, which has been widely used in the world. The patent document with application number 201110398281.7 discloses a low-temperature multi-effect seawater desalination system, which mainly includes multiple sets of heat pipe multi-effect evaporators, steam ejector TVC, cooler, air-water release device, steam-water separator, and water ring vacuum pump , Raw water pump, fresh water pump, steam turbine medium pressure cylinder, steam turbine low pressure cylinder, etc. The feature of this invention is that the multi-effect evaporator is multi-group, and utilizes the heat transfer performance of the heat pipe to eject the circulating steam in the cooler and the exhaust steam of the low-pressure cylinder of the steam turbine through the steam injector TVC, so that the circulating steam and the low-pressure cylinder of the steam turbine The exhaust steam becomes higher-quality steam and enters the heat pipe evaporator, thereby improving the seawater evaporation efficiency. At the same time, the invention utilizes low-quality exhaust steam from the low-pressure cylinder of the steam turbine to improve the energy utilization rate and the efficiency of the power plant, and the steam generated by the heating of the heat pipe is used as the heat source of several groups of evaporators to improve the utilization rate of the steam. Because what this invention utilizes is the exhaust steam of the low-pressure steam turbine low-pressure cylinder, so it is a kind of relatively large-scale industrial seawater desalination system in fact.

The patent document with application number 201110174880.0 discloses an industrial waste heat low-temperature multi-effect seawater desalination system, which includes a multi-effect seawater evaporator, a final effect condenser, a seawater feed pipe, a cooling water outlet pipe, a cooling water flow through pipe, and a brine flow out Pipes, condensate delivery pipes, product water return pipes, multiple sprinklers, multiple concentrated brine flow pipes, multiple product water flow pipes, etc. The invention applies industrial waste heat to the low-temperature multi-effect seawater desalination system, uses the high-temperature waste heat generated by industrial users as energy, converts it into working steam through the industrial waste heat boiler, and uses this working steam to carry out low-temperature multi-effect seawater desalination, and the first-effect evaporator produces The product water is returned to the industrial waste heat boiler for recycling, thereby reducing the water production cost of the low-temperature multi-effect seawater desalination system. Equally, this invention is also a kind of relatively large-scale industrial seawater desalination system.

At present, the small and medium-sized low-temperature multi-effect seawater desalination systems mostly consume primary energy because they cannot obtain a stable waste heat source, and the cost of water production is very high. Although some researchers have proposed a device for desalinating seawater using air-conditioning heat, the application number is 200610124010.1 The patent document discloses an integrated air-conditioning refrigeration and seawater desalination device, including a compressor, a condenser, an expansion valve, an evaporator, an induced draft fan, an exhaust fan and a spraying system. The fan is set on one side of the condenser, and the condenser and the evaporator are connected through an expansion valve. There is an air duct, one side of the evaporator is provided with an air inlet, and the spray system is provided between the condenser and the exhaust fan.

Although the above-mentioned device utilizes the waste heat of the air conditioner to desalinate seawater, the temperature of the waste heat generated by the general air conditioner is relatively low, generally only 40-50°C, the actual fresh water yield is low, and the economy is extremely low, which cannot meet the actual water supply application.

Contents of the invention

The invention discloses a winter-summer dual-purpose transcritical air conditioner and advection type seawater desalination cogeneration system, which utilizes high-temperature waste heat generated by the transcritical air conditioner to perform low-temperature multi-effect distillation to produce fresh water, thereby improving energy utilization and reducing The cost of desalinating seawater is reduced, environmental heat pollution is reduced, and the yield of fresh water is high, and water can be produced in winter and summer, with high practicability and good economic benefits.

A winter and summer dual-purpose transcritical air conditioner and advection seawater desalination cogeneration system, characterized in that it includes a transcritical air conditioner with a refrigeration cycle unit and a heating cycle system and an advection low temperature multi-effect distillation device;

The heating components of the heating cycle unit include an indoor heat exchanger and an air cooler that compress refrigerant through a compressor, and the heating cycle unit and the refrigeration cycle unit share the same air cooler;

The flat-flow low-temperature multiple-effect distillation device includes a multiple-effect distillation unit, a fresh water collection pipeline for collecting liquid fresh water, and a concentrated waste water discharge pipe for collecting concentrated seawater at the end. The air cooler is divided into at least two parts along the flow direction of the refrigerant. From the first effect distillation unit, the air coolers of each stage are sequentially connected to the corresponding effect distillation unit as an air cooling module.

The invention utilizes the exhaust heat generated by the transcritical air conditioner to produce fresh water through a low-temperature multi-effect distillation device, and the air cooler shared by the refrigeration cycle and the heating cycle is installed in the low-temperature multi-effect distillation device, so that fresh water can be produced in winter and summer, and has high practicability ;

In the present invention, the air cooler of the transcritical air conditioner is utilized to gradually reduce the temperature and release a large amount of heat along the flow direction of the refrigerant, and put it into the corresponding effect distillation unit of the low-temperature multi-effect distillation device in sections as the gas The cold module, wherein the corresponding effect refers to: the corresponding temperature decreases sequentially, that is, the temperature of each section of the air cooler decreases sequentially along the flow direction of the refrigerant, and the temperature of the corresponding low-temperature multi-effect distillation device decreases sequentially with the increase in the number of effects, and the corresponding installation is carried out step by step. The setting improves the utilization rate of the low-temperature multi-effect distillation device for the exhaust heat generated by the transcritical air conditioner; and the air cooler of the transcritical air conditioner is installed in each effect distillation unit, so that the overall system is more compact and the overall volume is reduced.

In the advection feeding mode, the material seawater can be pumped into all effective groups in parallel, and there is no need to set up additional effect pumps to repeatedly transport the material water. Therefore, the pump power consumption of the advection feeding system is generally lower than that of countercurrent feeding and downstream feeding. Feed, and the system control and operation are relatively simple.

Except for the first-effect distillation unit which fully utilizes external heat for distillation, all other effects are equipped with a distillation module that feeds fresh water vapor from the previous effect to distill seawater. Preferably, each section of air cooler is arranged in the distillation module of the effect distillation unit above.

Preferably, the flat-flow low-temperature multi-effect distillation device also includes a fresh water condenser for condensing the fresh water vapor produced by the last effect distillation unit and a seawater preheater for preheating the seawater to be desalinated, and the fresh water produced by the last effect distillation unit The temperature of the steam is not higher than 20°C;

The fresh water condenser includes a fresh water steam channel and a condensed water channel, and the two ends of the condensed water channel communicate with the first seawater inlet pipe and the seawater drain pipe;

The seawater preheater includes a freshwater channel connected to the freshwater collection pipeline, a concentrated seawater channel connected to the concentrated waste water discharge pipe, and a seawater channel. Both ends of the seawater channel are connected to the second seawater inlet pipe and the preheated seawater outlet pipe, The preheated seawater outlet pipe is connected to the preheated seawater inlet of the multi-effect distillation unit, and the temperature of the seawater passed into the second seawater inlet pipe is higher than the temperature of the seawater passed into the first seawater inlet pipe.

Regardless of whether it is summer or winter, the present invention adopts the air cooler of the transcritical air conditioner as the heat source, and aims at exhausting heat from the air conditioner with low heat production temperature, and combines the low temperature multi-effect distillation method for seawater desalination, which improves the energy utilization efficiency and has good Seawater freshwater production rate; at the same time, the seawater has a temperature difference with the depth change. Generally, the seawater temperature is less affected by the environment when the seawater depth exceeds 10 meters, and the overall stability is about 13-18°C; The environmental impact is relatively large. Generally, it is about 27-35°C in summer and 0-7°C in winter. The first seawater source with a lower temperature is used to condense the last-effect fresh water vapor, so that the temperature of the fresh-water vapor produced by the last effect can be set When the temperature of the first effect remains unchanged, the temperature difference between the first effect and the last effect is increased, thereby increasing the effect number of the low-temperature multi-effect distillation and increasing the yield of fresh water, while the seawater to be desalinated is used The temperature of the second seawater source is higher than that of the first seawater source. The higher the temperature of the seawater to be desalinated provided by the second seawater source is, the less time and energy consumption is required for preheating, which can reduce the preheating time and improve The preheated temperature of seawater to be desalinated further improves energy utilization efficiency and freshwater yield.

Since the seawater temperature will change in winter and summer, two sets of pipelines can be used to supply water to the first seawater inlet pipe and the second seawater inlet pipe respectively in winter and summer, but such a structure is more complicated, the consumption of pipelines is large, and the installation is complicated. Therefore, in order to simplify the structure, preferably, the first seawater inlet pipe and the second seawater inlet pipe are connected with a conductance selector for exchanging water inlets. By setting the conduction selector, the water inlets of the first seawater inlet pipe and the second seawater inlet pipe can be interchanged. At this time, if the water inlet of the first seawater inlet pipe is connected to deep seawater, and the second seawater inlet pipe The water inlet is located in shallow seawater, which is suitable for summer use. When winter comes, just use the conduction selector to switch the water inlets of the first seawater inlet pipe and the second seawater inlet pipe, so that the second seawater inlet pipe can pass into the shallow layer low-temperature seawater, and the first seawater inlet pipe passes into deep-layer high-temperature seawater. The conductance selector can be directly adjusted in the line, or can be realized by adjusting the valve assembly.

In order to simplify the equipment structure, preferably, the seawater preheater is a three-channel heat exchanger, and the three channels are respectively a fresh water channel, a concentrated seawater channel and a seawater channel.

In order to increase the yield of fresh water, if the temperature difference conditions allow, preferably, the low-temperature multiple-effect distillation device includes at least 7-effect distillation units.

Further preferably, the air cooler is divided into at least 3 sections.

In order to improve the heat exchange effect, preferably, the seawater preheater is connected by means of countercurrent heat exchange of cold and hot flows.

In order to improve the heat exchange effect, preferably, the fresh water condenser is connected by means of countercurrent heat exchange of cold and hot flows.

In order to improve refrigeration effect and energy utilization rate, preferably, the refrigerant of the transcritical air conditioner is a mixture of carbon dioxide and halogenated alkanes, a mixture of nitrous oxide and halogenated alkanes, or a mixture of R290 and R32.

Preferably, the transcritical air conditioner includes a heat recuperator used for heat exchange between the refrigerant output from the evaporator and the refrigerant output from the air cooler.

In order to simplify the structure of the equipment, preferably, the refrigeration cycle unit of the transcritical air conditioner and the heating cycle unit can be converted to each other, and the transcritical air conditioner includes: a shared compressor, a shared indoor heat exchanger, a shared Throttling valves, shared regenerators and outdoor heat exchangers;

The refrigeration cycle unit includes: a compressor installed in a cycle, an air cooler, a regenerator, a throttle valve and an indoor heat exchanger;

The heating cycle unit includes: a compressor installed in a cycle, an indoor heat exchanger, an air cooler, a regenerator, a throttle valve and an outdoor heat exchanger.

Compared with the ordinary air conditioner, the transcritical air conditioner of the present invention only adds an outdoor heat exchanger, so the equipment modification is simple and the modification cost is low.

In winter, the heating cycle unit of the transcritical air conditioner works. Preferably, the heating component of the heating cycle unit includes an outdoor heat exchanger for absorbing heat, and the outdoor heat exchanger includes a refrigerant channel and a second Three seawater passages, the temperature of seawater passing into the third seawater passage is higher than the temperature of seawater passing into the first seawater inlet pipe. The third seawater channel feeds in deep seawater whose temperature is higher than that of the shallow seawater fed into the first seawater inlet pipe for heat exchange, so that the refrigerant in the outdoor heat exchanger quickly absorbs heat and evaporates, improving the heating efficiency of the air conditioner. The third seawater The channel leads to the seawater that can directly drain into the second seawater inlet pipe. The outdoor heat exchanger works in winter, and what the third seawater channel leads into is deep seawater at this time.

Beneficial effects of the present invention:

In the winter and summer dual-purpose transcritical air-conditioning and seawater desalination cogeneration system of the present invention, the air cooler of the transcritical air conditioner is segmented and loaded into the corresponding effect distillation unit of the low-temperature multi-effect distillation device as an air-cooling module, which improves the low-temperature multi-effect distillation unit. The utilization rate of the waste heat generated by the transcritical air conditioner and the fresh water yield of the low-temperature multi-effect distillation unit are improved, and the air cooler of the transcritical air conditioner is directly installed in each effect distillation unit, so that the overall system is more compact and reduces The overall volume is small, and it can produce water in both winter and summer, and has the function of cooling or heating. It has high practicability and good economic benefits.

Description of drawings

Fig. 1 is a schematic structural diagram of the system of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , the winter and summer dual-use transcritical air-conditioning and seawater desalination cogeneration system of this embodiment includes a transcritical air-conditioning unit and a flow-type low-temperature multiple-effect distillation device with a refrigeration cycle unit and a heating cycle unit.

The valves of this system include valve 001, valve 002, valve 003, valve 004, valve 005, valve 006, valve A, valve B, valve C, valve D, valve A ~ valve D four valves combined with the pipeline to form a conduction selection device.

Transcritical air conditioner includes: indoor heat exchanger 1, four-way valve 2, compressor 3, outdoor heat exchanger 4, air cooler 24, three-way valve 25, regenerator 26, three-way valve 27, throttling device 28 , composed of filter 29. The outlet of compressor 3 is connected to port c of four-way valve 2, and port d of four-way valve 2 is divided into two channels, one of which is connected to the inlet of valve 002, and the outlet of valve 002 is divided into two channels, one of which is connected to The outlet of valve 001 is connected, the inlet of valve 001 is connected with the outlet of indoor heat exchanger 1; the other channel of the outlet of valve 002 is connected with the inlet of air cooler 24, and the outlet of air cooler 24 is divided into two channels, one of which is connected with the inlet of valve 003 , the outlet of the valve 003 is connected with the inlet of the valve 006, the other channel of the outlet of the air cooler 24 is connected with the inlet of the valve 004, and the outlet of the valve 004 is connected with the inlet of the indoor heat exchanger 1. The other channel of port d of four-way valve 2 is connected to the inlet of valve 005, the outlet of valve 005 is connected to the inlet h1 of outdoor heat exchanger 4, the outlet i1 of outdoor heat exchanger 4 is connected to the inlet of valve 006, and the outlet of valve 006 is connected to the three-way valve The e2 port of 27 is connected, the e3 port of the three-way valve 27 is connected with the inlet g3 of the regenerator 26, the outlet g4 of the regenerator 26 is connected with the inlet of the throttling device 28, and the outlet of the throttling device 28 is connected with the f3 port of the three-way valve 25 , the f1 port of the three-way valve 25 is connected to the inlet of the filter 29, the outlet of the filter 29 is connected to the inlet of the indoor heat exchanger 1, the outlet of the indoor heat exchanger 1 is connected to the b port of the four-way valve 2, and the a of the four-way valve 2 The port is connected to the inlet g1 of the regenerator 26, and the outlet g2 of the regenerator 26 is connected to the inlet of the compressor 3. The f2 port of the three-way valve 25 is connected with the inlet of the valve 006, and the e1 port of the three-way valve 27 is connected with the filter 29 inlet. The air cooler 24 is connected in parallel with the indoor heat exchanger 1 during winter.

The flat-flow low-temperature multi-effect distillation device includes: n-effect distillation device 5, the first effect to the last effect are respectively the first effect distillation device 5-1, the second effect distillation device 5-2 ... the nth effect distillation device 5 -n, n spray seawater cut-off devices 6-1~6-n, n vacuum pump inlet cut-off devices 7-1~7-n, vacuum pump 8, fresh water condenser 11, first seawater inlet filter 12, first Seawater inlet water pump 13, second seawater inlet water pump 14, fresh water outlet water pump 15, concentrated seawater outlet water pump 16, second seawater inlet filter 17, concentrated seawater outlet cut-off device 18, fresh water outlet cut-off device 19, seawater preheater 20, n-1 seawater outlet depressurization devices 22-1 to 22-n-1, and n-2 fresh water outlet depressurization devices 23-2 to 23-n-1. The first-effect distillation unit includes a first-stage air cooler 24 - 1 including an air conditioner, a spraying device 9 and a gas-liquid separation device 10 . Each effect of the 2nd to m effect distillation devices includes the second stage air cooler 24-2 to the mth stage air cooler 24-m, the evaporation condenser 21, the spray device 9 and the gas-liquid separation device 10. The m+1-th effect distillation devices include an evaporation condenser 21 , a spray device 9 and a gas-liquid separation device 10 .

The second seawater inlet II is divided into two channels, one of which is connected to the inlet of valve C, and the outlet of valve C is connected to the first seawater inlet water pump 13 . Another channel is connected with the inlet of valve D, the outlet of valve D is connected with the inlet of the second seawater inlet water pump 14, the outlet of the second seawater inlet water pump 14 is connected with the inlet of the second seawater inlet filter 17, and the outlet of the second seawater inlet filter 17 is connected with the seawater The inlet b2 of the preheater 20 is connected, the inlet b2 of the seawater preheater 20 is connected with the outlet a2, and the outlet a2 of the seawater preheater 20 is divided into n channels, which are respectively connected to the spray seawater cut-off devices 6-1~6- The n inlets are connected, and the outlets of each effect spray seawater cut-off device 6-1 to 6-n are connected with the corresponding spray device 9 inlets, and the outlets of each spray device 9 are located at the top of the effect distillation device 5 . There is a concentrated seawater outlet channel at the bottom of each effect distillation device 5, and each concentrated seawater outlet channel is connected to the inlet of a seawater outlet decompression device 22-1~22-n-1 respectively, and the concentrated seawater outlet channel of the last effect has no Pressure reducing device. The outlet of each seawater outlet pressure-reducing device 22-1～22-n-1 and the last effective concentrated seawater outlet channel are connected to the inlet a3 of the seawater preheater 20, the inlet a3 of the seawater preheater 20 is connected to the outlet b3, and the seawater preheater 20 is connected to the outlet b3. The outlet b3 of the heater 20 is connected to the inlet of the concentrated seawater outlet cut-off device 18, the outlet of the concentrated seawater outlet cut-off device 18 is connected to the inlet of the concentrated seawater outlet pump 16, and the concentrated seawater outlet pump 16 is connected to the concentrated seawater outlet I. Each effect distillation device 5 is equipped with a gas-liquid separation device 10, and its inlet is located inside the effect distillation device 5, and the gas-liquid separation device in the first to n-1 effect distillation devices 5-1 ~ 5-n-1 The outlets of 10 are all communicated with the inlets of the evaporative condenser 21 in the next effect distillation device 5, and the outlets of the 2nd to n-1 effect evaporative condensers 21 are the fresh water passages, which are respectively connected with a fresh water outlet depressurization device 23-22～ 3-n-1 inlets are connected, the nth effect fresh water channel has no decompression device, and the outlet of each fresh water outlet depressurization device 23-2～23-n-1 and the last fresh water channel are connected to the inlet of seawater preheater 20 a1 is connected, the inlet a1 of the seawater preheater 20 is connected with the outlet b1, the outlet b1 of the seawater preheater 20 is connected with the inlet of the fresh water outlet cut-off device 19, the outlet of the fresh water outlet cut-off device 19 is connected with the inlet of the fresh water outlet water pump 15, and the fresh water outlet water pump 15 The outlet is connected to the fresh water outlet III; the outlet of the gas-liquid separation device 10 in the nth effect distillation device 5-n is connected to the inlet c2 of the fresh water condenser 11, the inlet c2 of the fresh water condenser 11 is connected to the outlet d2, and the outlet of the fresh water condenser 11 d2 is connected with the fresh water passage between the outlet b1 of the seawater preheater 20 and the inlet of the fresh water outlet cut-off device 19 . The outlet of the air cooler in the i effect distillation unit 5-i=1～m is connected with the outlet of the air cooler 24 in the next effect distillation unit, and the outlet of the air cooler 24-m in the m effect distillation unit is connected with the outlet of the air cooler 24-m in the m effect distillation unit respectively Valve 003 and valve 004 inlets are connected. The first seawater inlet IV is connected with the deep seawater channel and is divided into two strands. One of the passages is connected to the inlet of valve B, the outlet of valve B is connected to the inlet of the second seawater inlet water pump 14, the second seawater inlet water pump 14 is connected to the inlet of the second seawater inlet filter 17, and the outlet of the second seawater inlet filter 17 is divided into two One channel is connected to the inlet b2 of the seawater preheater 20, the other is connected to the inlet h2 of the outdoor heat exchanger 4 of the air conditioner, and the outlet i2 of the outdoor heat exchanger 4 is connected to the seawater drain V; the other deep seawater channel is connected to the valve A inlet is connected, the outlet of valve A is connected with the inlet of the first seawater inlet water pump 13, the outlet of the first seawater inlet water pump 13 is connected with the inlet of the first seawater inlet filter 12, and the first seawater inlet filter 12 is connected with the inlet d1 of the fresh water condenser 11 The inlet d1 of the fresh water condenser 11 is connected with the outlet c1, and the outlet c1 of the fresh water condenser 11 is connected with the seawater outlet V. There is also a passage on the top of each effect distillation device 5, which is connected with the outlet of each effect vacuum pump inlet cut-off device 7, and the inlet of each vacuum pump inlet cut-off device 7 is connected with the vacuum pump 8 outlet, and the vacuum pump 8 inlet is communicated with the atmosphere.

In summer, transcritical air conditioner, close valve 001, valve 004, valve 005, valve 006, open valve 002, valve 003, the refrigerant is compressed into high temperature and high pressure gas in the compressor 3, enters the four-way valve 2 from the c port, and then Port d flows out of the four-way valve 2, and enters the air cooler 24 and the 1st to m (1<m<n, n≥3, in the present embodiment, n=15, m=3) effect distillation device of the seawater desalination device The seawater exchanges heat successively, and as the number of effects increases, the temperature of the air cooler 24 gradually decreases. After being cooled in the air cooler 24, it passes through the e2 and e3 ports of the three-way valve 27, enters the regenerator 26 for precooling from the g3 port, and enters the throttling device 28 for decompression after flowing out of the regenerator 26 from the g4 port. The gas-liquid two-phase mixture passes through the f3 and f1 ports of the three-way valve 25, then passes through the filter 29 and then enters the indoor heat exchanger 1, where the indoor heat exchanger 1 absorbs heat from the room and cools while evaporating into steam. Port b enters the four-way valve 2, and then leaves the four-way valve 2 through port a, enters the regenerator 26 through the g1 port for preheating, and then flows out of the regenerator 26 through the g2 port and returns to the compressor 3, thus completing a refrigeration cycle.

In winter, the air conditioning circulation device closes valve 002, valve 003, opens valve 001, valve 004, valve 005, and valve 006. The refrigerant is compressed in the compressor 3 into a high-temperature and high-pressure gas, enters the four-way valve 2 through the c port, and then flows out of the four-way valve 2 through the b port. The refrigerant vapor is divided into two streams, and one stream passes through the indoor heat exchanger 1 Cooling, the other enters the air cooler 24 and exchanges heat step by step with the seawater in the first to m effect distillation devices of the seawater desalination device. As the number of effects increases, the temperature of the air cooler gradually decreases, and after being cooled, it exchanges heat with the indoor The refrigerant coming out of the refrigerant unit passes through the filter 29, then through the e1 port and the e3 port of the three-way valve 27, enters the regenerator 26 from the g3 port for precooling, flows out of the regenerator 26 from the g4 port, and enters the throttling device 28 After decompression, the gas-liquid two-phase mixture passes through the f3 and f2 ports of the three-way valve 25, and then enters the outdoor heat exchanger 4. In the indoor heat exchanger 4, it absorbs heat and cools while evaporating into steam, and then passes through d port enters the four-way valve 2, and then leaves the four-way valve 2 through the a port, enters the regenerator 26 through the g1 port for preheating, and then flows out of the regenerator 26 through the g2 port and returns to the compressor 3, thereby completing a Winter cycle. The deep seawater passes through the second seawater inlet water pump 14 and the second seawater inlet filter 17 and then flows through the outdoor heat exchanger 4 . In winter, the deep seawater with high temperature exchanges heat with the refrigerant in the outdoor heat exchanger 4 .

During this cycle, carbon dioxide can be selected as the air-conditioning refrigerant.

Seawater desalination process: In summer, the seawater desalination device closes valves B and C, opens valves A and D. In winter, the seawater desalination device closes valve A and valve D, opens valve B and valve C.

In summer, shallow high-temperature seawater flows through valve D (in winter, deep-layer high-temperature seawater flows through valve B to enter the shallow seawater channel), and is introduced by the second seawater inlet pump 13 into the second seawater inlet filter 17 for filtration (part of the high-temperature seawater in winter passes into the air conditioner The outdoor heat exchanger 4 of the circulation device exchanges heat with it and cools down, and then it is discharged from the seawater outlet V) and then passes into the seawater preheater 20, exchanges heat with fresh water and concentrated seawater, and then enters each effect distillation device 5, and each effect distillation device Spray seawater cut-off devices 6-1-6-n are arranged between the seawater inlet and the seawater preheater 20 for controlling the seawater in and out. The seawater entering each effect distillation device is sprayed to the outside of the pipeline of the evaporative condenser 21 through the spray device 9 (the seawater of the first effect distillation device is sprayed to the outside of the air cooler 24 pipeline, and the second to m effect distillation devices are sprayed to the outside of the gas cooler 24 pipeline. cooler 24 and evaporative condenser 21 outside the pipeline), and perform heat exchange and evaporation with the steam generated by the last effect in the evaporative condenser 21 (the first effect exchanges heat with the first stage air cooler 24-1, the second to m heat exchange with the steam generated by the first effect in the 2nd to m section air coolers 24-2 to 24-m and the evaporative condenser 21), a part of the seawater evaporates into steam and enters the next effect after passing through the gas-liquid separation device 10 The pipes of the evaporation condenser 21 exchange heat with the seawater of the next effect; part of the seawater is concentrated into concentrated seawater, which flows out from the outlet channel of the concentrated seawater at the bottom of each effect distillation device, and passes through the seawater outlet depressurization device 22-1~22-n-1 After depressurization, it is passed into the seawater preheater 20 to exchange heat with the imported shallow high-temperature seawater to cool down, and then it is discharged through the concentrated seawater outlet pump 16. There is a concentrated seawater outlet cut-off device between the concentrated seawater outlet pump 16 and the seawater preheater 20 18. It is used to control the discharge of concentrated seawater; at the same time, the steam in the evaporative condenser 21 is cooled to fresh water after heat exchange, and is depressurized by the fresh water outlet decompression device 23-2~23-n-1, and then passes through the seawater preheater 20 and the imported water. The shallow high-temperature seawater is discharged by the fresh water outlet pump 15 after heat exchange and cooling. A fresh water outlet cut-off device 19 is provided between the fresh water outlet pump 15 and the seawater preheater 20 to control the discharge of fresh water. The seawater passed into the first effect distillation unit 5 exchanges heat with the air cooler 24 of the air conditioner, and the seawater passed into the second to m effect distillation units 5 exchanges heat with the air cooler 24 and the evaporative condenser 21. The steam produced by the last effect distillation device 5 passes directly through the outlet of the gas-liquid separation device 10 into the fresh water condenser 11 to exchange heat with deep-layer low-temperature seawater for cooling, and then with the fresh water produced by other effects after heat exchange through the seawater preheater 20 Combine and discharge together. Low-temperature seawater, deep-layer low-temperature seawater passes through valve A in summer, and shallow-layer low-temperature seawater passes through valve C in winter, passes through the first seawater inlet water pump 13 and the first seawater inlet filter 12, enters the fresh water condenser 11 after heat exchange and heats up, and is directly discharged. Before the operation of the device, the vacuum pump 8 has pumped each effect distillation device to a set vacuum degree, and a vacuum pump inlet cut-off device 7-1~7-n is set between the vacuum pump and each effect distillation device to control the effect of each effect. Air pressure in the distillation unit 5.

In this process, the exhaust heat generated by the air-conditioning air cooler heats the seawater in the first to m effect distillation units step by step.

Below in conjunction with accompanying drawing 1, the specific operation process of the present invention will be further described:

1. Before the system runs, confirm that there is no water in each pipeline and device and seal it. In summer, the air conditioning circulation device partially closes valve 001, valve 004, valve 005, and valve 006, opens valve 002 and valve 003, and partially closes the seawater desalination device. Valve B, valve C, open valve A, valve D; in winter, air-conditioning circulation device partially closes valve 002, valve 003, opens valve 001, valve 004, valve 005, valve 006, seawater desalination device partially closes valve A, valve D, Open valve B and valve C. Close each effect spraying seawater inlet cut-off device 6-i, i=1～n, concentrated seawater outlet cut-off device 18 and fresh water outlet cut-off device 19, open the n effect vacuum pump outlet cut-off device (7-i, i =1～n), turn on the vacuum pump 8, and pump each effect distillation device to a set vacuum degree. The vacuum pump outlet cut-off device (7-i, i=1-n) is used to control the air pressure in each effect distillation device. The n-effect spraying seawater inlet cut-off device (6-i, i=1～n), the concentrated seawater outlet cut-off device 18 and the fresh water outlet cut-off device 19 are used to control the entry and exit of seawater, concentrated seawater and fresh water respectively.

2. After completing vacuuming, close the n-effect vacuum pump outlet cut-off device (7-i, i=1～n) connected to the vacuum pump 8, then close the vacuum pump 8, and then turn on the first seawater inlet water pump 13 and the second seawater inlet water pump 14. Open the n-effect spray seawater inlet cut-off device (6-i, i=1～n), start the compressor 3 to run the air-conditioning circulation device, after the fresh water channel and the concentrated seawater channel are filled with water, start the fresh water outlet pump 15 and concentrated Seawater outlet water pump 16, and then open concentrated seawater outlet cut-off device 18 and fresh water outlet cut-off device 19, after the whole system runs stably for a period of time, a certain amount of seawater can be desalinated by air-conditioning exhaust heat.

Such a cycle operation can realize continuous desalination of seawater by using the waste heat of the air conditioner air cooler.

When this embodiment is actually used:

Parameters of transcritical air conditioning:

Cooling capacity: 3500W;

Refrigerant: CO ₂ ;

Summer time:

Compressor outlet: 120°C, 103bar;

The evaporation temperature of the indoor heat exchanger: 7.2°C;

High pressure side regenerator inlet (outlet from air cooler): 40°C, 103bar;

High pressure side regenerator outlet (into the evaporator): 35°C, 103bar;

Low-pressure side regenerator outlet (into the compressor): 16.11°C, 34.8bar;

During winter:

Compressor outlet: 80°C, 90bar;

The evaporation temperature of the outdoor heat exchanger: 13°C;

High pressure side regenerator inlet (outlet from air cooler): 45°C, 90bar;

High-pressure side regenerator outlet (into the evaporator): 35°C, 90bar;

Low-pressure side regenerator outlet (into the compressor): 20°C, 48.5bar;

Air cooler outlet temperature of indoor heat exchanger: 45°C, 90bar;

Parameters of low temperature multiple effect distillation unit:

The temperature of the first effect distillation unit: 42°C;

Summer time:

The temperature of the first seawater source fed into the first seawater inlet IV: 15°C;

The temperature of the second seawater source fed by the second seawater inlet II: 30°C;

Effect number: 12;

Final steam temperature: 18°C;

The inlet flow rate of the second seawater source: 0.045kg/s.

During winter:

The temperature of the second seawater source fed into the first seawater inlet IV: 15°C;

The temperature of the first seawater source fed by the second seawater inlet II: 5°C;

Effect number: 12;

Final effect steam temperature: 8°C;

The inlet flow of the first seawater source: 0.045kg/s.

The simulated water production rate in summer is about: 0.027kg/s, about 98kg per hour, up to 2.3 tons per day; the simulated water production rate in winter is about 0.021kg/s, about 76kg per hour, and about 2.3 tons per day It can reach 1.8 tons, and the heat output is about 3.7kW.

Claims (7)

1. a kind of Trans-critical cycle air-conditioning of Winter-summer dual purpose and flat flow desalinization co-generation system, it is characterised in that including with system The Trans-critical cycle air-conditioning and flat flow low temperature multiple-effect distillation device of SAPMAC method unit and heating recycle system；

The heating parts for heating cycling element include indoor heat exchanger and the air cooling heated by compressor compresses refrigerant Device, it is described to heat cycling element and refrigerating cycle unit shares same air cooler；

The flat flow low temperature multiple-effect distillation device include multi-effect distilling unit, collect liquid fresh water fresh water collect pipeline and The outer comb of density wastewater of end concentrated seawater is collected, flow direction of the air cooler along refrigerant is divided at least two sections, from first Effect distillation unit starts each section of air cooler and is sequentially ingressed into correspondence effect distillation unit as air cooling module；

The flat flow low temperature multiple-effect distillation device also includes the fresh water for condensing the fresh water steam of last effect distillation unit output Condenser and the seawater preheating device for preheating seawater to be diluted, the temperature of the fresh water steam of last effect distillation unit output are not higher than 20℃；

The fresh water condenser includes fresh water steam channel and condensation water channel, the sea of two ends connection first of the condensation water channel Water inlet pipe and seawater drainpipe；

The seawater preheating device includes connection fresh water and collects the product water channel of pipeline, the concentrated seawater passage of the outer comb of connection density wastewater And sea water passage, the two ends of the sea water passage connect the second seawater inlet pipe and pre- hot sea water outlet pipe, the pre- hot sea water Outlet pipe accesses the preheating sea intake of multi-effect distilling unit, the water inlet access deep sea water of the first seawater inlet pipe, the second sea The water inlet of water inlet pipe is located at shallow layer sea water；

The first seawater inlet pipe and the second seawater inlet pipe are connected with the conducting selector for exchanging water inlet.

2. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 1 and flat flow desalinization co-generation system, its feature exist In the top of the distillation module of effect distillation unit where each section of air cooler is arranged in.

3. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 1 or 2 and flat flow desalinization co-generation system, its feature It is, the seawater preheating device is triple channel heat exchanger, and triple channel is respectively product water channel, concentrated seawater passage and sea water passage.

4. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 1 or 2 and flat flow desalinization co-generation system, its feature It is, the low temperature multiple-effect distillation device includes at least 7 effect distillation units.

5. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 1 or 2 and flat flow desalinization co-generation system, its feature It is, the air cooler is divided at least 3 sections.

6. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 1 or 2 and flat flow desalinization co-generation system, its feature It is, the refrigerant of the Trans-critical cycle air-conditioning is using carbon dioxide and mixture, nitrous oxide and the alkyl halide of halogenated alkane The mixture or R290 and R32 mixture of hydrocarbon.

7. the Trans-critical cycle air-conditioning of Winter-summer dual purpose as claimed in claim 6 and flat flow desalinization co-generation system, its feature exist In the refrigerant that the Trans-critical cycle air-conditioning includes the refrigerant and air cooler output for being used for evaporator output carries out returning for heat exchange Hot device.