CN104944492B - A kind of Winter-summer dual purpose air-conditioning and the method and system of flat flow desalinization coproduction - Google Patents

Abstract

The invention discloses a method for combined production of winter and summer dual-purpose air conditioners and advection seawater desalination, comprising the following steps: using condensation heat in the cooling process of the air conditioner or condensation heat in the heating process as a heat source, and adopting advection low-temperature multi-effect distillation desalination of seawater; the fresh water vapor from the previous effect enters the next effect for condensation, and the temperature of the fresh water vapor decreases step by step, and the temperature of the fresh water vapor produced by the last effect is lower than 20°C; the seawater from the first seawater source is condensed and finally The freshwater steam produced by one effect; the seawater from the second seawater source is taken as the seawater to be desalinated, and the freshwater and concentrated seawater produced by the other effects are used to preheat the seawater to be desalinated. The temperature of the second seawater source is higher than that of the first seawater source temperature. The invention also discloses a combined production system of winter and summer dual-purpose air-conditioning and advection seawater desalination; the invention utilizes the low-temperature waste heat generated by the air-conditioning and the temperature difference of seawater in the ocean, and uses low-temperature seawater to condense fresh water to increase the efficiency of the distillation device. Increases freshwater yield.

Description

A method and system for combined production of winter and summer dual-purpose air conditioners and advection seawater desalination

technical field

The invention relates to seawater desalination technology, in particular to a method and system for combined production of winter and summer dual-purpose air conditioners and advection seawater desalination.

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.

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 devices use waste heat from air conditioners to desalinate seawater, they only use single-effect work, and the temperature of waste heat generated by air conditioners is relatively low, generally only 40-50°C. The actual fresh water yield is low and cannot meet the actual water supply application.

Contents of the invention

The invention discloses a method for joint production of winter and summer dual-purpose air conditioners and advection seawater desalination. The waste heat of the air conditioner in summer or the condensation heat generated by the air conditioner in winter are used to carry out low-temperature multi-effect distillation to produce fresh water, which improves the energy utilization rate and reduces the The cost of desalination of seawater is reduced, and environmental heat pollution is reduced. At the same time, the temperature difference of seawater is used to increase the yield of fresh water. Water can be produced in winter and summer. It has high practicability and good economic benefits.

A method for combined production of winter and summer dual-purpose air conditioners and advection seawater desalination, comprising the following steps:

Using the condensation heat in the air-conditioning refrigeration process or the condensation heat in the heating process as the heat source, seawater desalination is carried out by advection low-temperature multi-effect distillation;

The fresh water vapor from the previous effect enters the next effect for condensation, and the temperature of the fresh water vapor decreases step by step, and the temperature of the fresh water steam produced in the last effect is lower than 20°C;

Take the seawater from the first seawater source to condense the freshwater vapor produced in the last effect;

The seawater from the second seawater source is taken as the seawater to be desalinated, and the seawater to be desalinated is preheated by the fresh water and concentrated seawater produced by other effects, and the temperature of the second seawater source is higher than that of the first seawater source.

In summer, the present invention adopts the condensation heat in the refrigeration cycle of the air conditioner as the heat source, and combines the low-temperature multi-effect distillation method for seawater desalination for the air-conditioning condensation heat with low heat generation temperature, which improves the energy utilization efficiency and has good seawater Fresh water production rate; at the same time, using the phenomenon of seawater temperature difference with the depth change, the first seawater source with lower temperature is used to condense the last effect of fresh water vapor, so that the temperature of the fresh water vapor produced by the last effect can be set relatively 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 uses a high temperature Compared with the second seawater source 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 increase the temperature of the seawater to be desalinated. The preheated temperature of seawater further improves energy utilization efficiency and freshwater yield.

In winter, the present invention adopts the condensation heat in the heating cycle of the air conditioner as the heat source. In winter, the seawater also has a temperature difference. At this time, the phenomenon that the seawater has a temperature difference as the depth changes in the ocean can still be used, and a lower temperature one can be used. The first seawater source condenses the fresh water vapor of the last effect, so that the temperature of the fresh water vapor produced by the last effect can be set lower, and the temperature between the first effect and the last effect can be increased when the temperature of the first effect remains unchanged. temperature difference, thereby increasing the effect of low-temperature multi-effect distillation and increasing the yield of fresh water, while the seawater to be desalinated uses the second seawater source whose temperature is higher than the first seawater source, and the higher the temperature of the seawater to be desalinated provided by the second seawater source , the less time and energy consumption are required for preheating, the preheating time can be reduced, the temperature of the seawater to be desalinated after preheating can be increased, and the energy utilization efficiency and fresh water yield can be further improved.

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.

In order to reduce energy consumption, preferably, the temperature of the heat source is controlled at 30-55°C. 40-55°C is the temperature of condensation heat produced by ordinary air conditioners in summer. Using the method of the present invention does not need to increase the power of the air conditioner to increase the temperature, and still has a high fresh water yield, thereby reducing energy consumption. When the temperature of the heat source is 40°C In winter, the minimum number of effects reaches 7; in winter, ordinary air conditioners are heated by condensation heat, and the heating temperature is generally 30-45°C.

Generally, the cooling function of the air conditioner is used in summer when the temperature is high. At this time, the surface temperature of the ocean is high, and the temperature of the deep seawater is low; while the heating function of the air conditioner is used in winter when the temperature is low. The temperature of the surface layer is low, while the temperature of the deep seawater is higher; generally, the seawater temperature is less affected by the environment if the depth of the seawater is more than 10 meters, and the overall temperature is relatively stable at about 13-18°C; the surface seawater is greatly affected by the environment, generally about 27～35℃, and 0～7℃ in winter. Therefore, when air-conditioning is used for cooling in summer, the first seawater source with lower temperature is taken from deep seawater, and the second seawater source with higher temperature is taken from shallow seawater; When the air conditioner is used for heating, the first seawater source with lower temperature is taken from shallow seawater, and the second seawater source with higher temperature is taken from deep seawater.

In the present invention, the temperature of the first seawater source can be condensed as long as it is lower than the temperature of the fresh water vapor produced by the last effect. Therefore, preferably, when the air conditioner is used for cooling, the temperature of the first seawater source is 13-18°C. When the air conditioner is heating, the temperature of the first seawater source is 0-7°C.

The higher the temperature of the second seawater source, the better, which can reduce the energy required for preheating. Preferably, when the air conditioner is cooling, the temperature of the second seawater source is 27-35°C, and when the air conditioner is heating, the second The temperature of the seawater source is 13-18°C.

The invention also discloses an air-conditioning and seawater desalination combined production system for both winter and summer, which has compact structure, high energy utilization rate, fresh water output in both winter and summer, good practicability, and high fresh water production rate.

A winter and summer dual-purpose air conditioner and advection seawater desalination co-production system, including an air conditioner with a refrigeration cycle unit and a heating cycle unit, and also includes an advection low-temperature multiple-effect distillation device, the advection low-temperature multiple-effect distillation device includes: Multi-effect distillation unit, fresh water collection pipeline for collecting liquid fresh water, concentrated waste water discharge pipe for collecting terminal concentrated sea water, fresh water condenser for condensing the fresh water vapor produced by the last effect distillation unit, and sea water preheating for preheating seawater to be desalinated Each effect distillation unit is equipped with a preheated seawater inlet, the concentrated seawater outlet of each effect distillation unit is connected to the concentrated waste water discharge pipe, and the temperature of the fresh water vapor produced by the last effect distillation unit is lower than 20°C;

The heating components of the heating cycle unit include an indoor heat exchanger and a condenser for heating by compressing refrigerant through a compressor, and the heating cycle unit and the refrigeration cycle unit share the same condenser, and the condenser serves as the first Condensing module of efficient distillation unit;

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.

In the system of the present invention, the condenser of the air conditioner is used as the condensing module of the first-effect distillation unit, and the refrigeration cycle unit and the heating cycle unit share the same condenser, thereby making the whole system more compact and reducing the overall volume; Condensation of effective fresh water vapor and preheating of seawater to be desalinated are carried out through two different heat exchange units to exchange heat with seawater of different temperatures, using low-temperature seawater to condense the last effect of fresh water steam, so that the temperature of the last effect of fresh water steam is set lower , so that under the condition that the temperature of the first effect remains unchanged, the efficiency of the distillation unit is increased, and the yield of fresh water is increased; temperature, the higher the temperature of the seawater to be desalinated that passes into the second seawater inlet pipe, the less time and energy consumption required for preheating, which can reduce the preheating time and increase the temperature of the seawater to be desalinated after preheating , to further improve energy utilization efficiency and fresh water yield.

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.

Generally, the seawater depth of more than 10 meters is less affected by the environment, and the overall temperature is relatively stable at about 13-18°C; the surface seawater is more affected by the environment, generally about 27-35°C in summer and 0-7°C in winter .

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.

The more effects the distillation device has, the greater the temperature difference between the first effect and the last effect will be. In order to reduce energy consumption, preferably, the heating temperature of the condenser of the air conditioner is 30-55°C.

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 simplify the structure of the equipment, preferably, the refrigeration cycle unit of the air conditioner and the heating cycle unit can be interchanged, and the air conditioner includes: a shared compressor, a shared indoor heat exchanger, a shared throttle valve and outdoor heat exchanger;

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

The heating circulation unit includes: a compressor installed in circulation, an indoor heat exchanger, a condenser, a throttle valve and an outdoor heat exchanger.

Compared with the common air conditioner, the 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 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 third seawater channel, the temperature of the seawater that passes into the third seawater passage is higher than the temperature of the seawater that passes 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:

The air conditioner and seawater desalination co-production method and system of the present invention utilize the low-temperature waste heat generated by the air conditioner and the temperature difference of seawater in the ocean, use low-temperature seawater to condense fresh water to increase the efficiency of the distillation device, increase the yield of fresh water, and simultaneously use high-temperature seawater as Preheat the seawater to be desalinated, reduce the heat required to heat up the seawater to the evaporation temperature, increase the evaporation rate of seawater and energy utilization, and further increase the freshwater yield, and can produce water in both winter and summer, and has cooling or heating functions, practical High performance 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 cogeneration of air conditioner and seawater desalination for both winter and summer in this embodiment includes an air conditioner with a refrigeration cycle unit and a heat cycle unit and a flow-type low-temperature multiple-effect distillation device.

The air conditioner comprises a compressor 3, a four-way valve 2, a condenser 24, an outdoor heat exchanger 4, a throttling device 25, a filter 26 and an indoor heat exchanger 1. The outlet of compressor 3 is connected to port 2c of four-way valve, and the 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 valve 001 The outlet 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 condenser 24, and the outlet of condenser 24 is divided into two channels, one of which is connected with the inlet of valve 003, and the outlet of valve 003 It is connected with the inlet of valve 006, another channel of the outlet of condenser 24 is connected with the inlet of valve 004, and the outlet of valve 004 is connected with the inlet of 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 e1 of outdoor heat exchanger 4, the outlet f1 of outdoor heat exchanger 4 is connected to the inlet of valve 006, and the outlet of valve 006 is connected to the throttling device 25 inlet is connected, the throttling device 25 outlet is connected with the filter 26 inlet, the filter 26 outlet is connected with the indoor heat exchanger 1 inlet, the indoor heat exchanger 1 outlet is connected with the b port of the four-way valve 2, and the four-way valve 2 Port a is connected to the inlet of the compressor 3, and the condenser 24 is connected in parallel with the indoor heat exchanger 1 in winter.

The low-temperature multi-effect distillation device includes: n-effect distillation device 5, which are respectively the first effect distillation device 5-1, the second effect distillation device 5-2 ... the nth effect distillation device 5-n, and 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 pump 15, concentrated seawater outlet 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 -1～22-n-1, n-2 fresh water outlet decompression devices 23-2～23-n-1 and four valves of valve A～valve D, the four valves of valve A～valve D are combined with the pipeline to form a guide pass selector.

The first effect distillation device includes an air-conditioned condenser 24 , a spray device 9 and a gas-liquid separation device 10 . The remaining several-effect distillation devices include an evaporative 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 deep seawater channel between the first seawater inlet water pump 13 and valve A. 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 23-2～ The inlets of 23-n-1 are connected, and the last effect fresh water channel has no decompression device, and the outlets of each fresh water outlet depressurization device 23-2～23-n-1 and the last effect fresh water channel are connected with 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 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 with the inlet b2 of the main heat exchanger, the other is connected with the inlet e2 of the outdoor heat exchanger 4 of the air-conditioning circulation device, and the outlet f2 of the outdoor heat exchanger 4 is connected with the seawater drain V; the other deep seawater channel is connected with The inlet of valve A 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 of the fresh water condenser 11 d1 is connected, 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 sea water 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 this embodiment, the refrigerant of the air conditioner is R134a, and other refrigerants, such as R1234yf, R410A or R407C, can also be selected. This embodiment is used in the cooling environment of the daily air conditioner. Generally at 40-50°C.

In this embodiment, the refrigeration cycle unit and the heating cycle unit of the air conditioner can be switched mutually. In summer, the air conditioner closes valves 001, 004, 005, and 006, and opens valves 002 and 003. 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, then flows out of the four-way valve 2 through the d port, and enters the condenser 24 to exchange heat with seawater in the first-effect distillation device of the seawater desalination device , is cooled and further condensed into a liquid, then enters the throttling device 25 for decompression, and part of the liquid flashes into steam, and the gas-liquid two-phase mixture passes through the filter 26 and then enters the indoor heat exchanger 1. Absorb heat from the room for cooling while evaporating into steam, enter the four-way valve 2 through port b, leave the four-way valve 2 through port a, and return 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 into a high-temperature and high-pressure gas in the compressor 3, enters the four-way valve 2 through the c port, and then leaves 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 is condensed into a liquid, and the other enters the condenser 24 to exchange heat with the seawater in the first-effect distillation device of the seawater desalination device, is cooled and further condensed into a liquid, and then merges with the liquid coming out of the indoor heat exchanger, and then passes through the filter into the throttling device 25 to depressurize, part of the liquid flashes into steam, and the gas-liquid two-phase mixture enters the outdoor heat exchanger 4, absorbs heat and cools in the outdoor heat exchanger 4 while evaporating into steam, and then passes through d A port enters the four-way valve 2, and then leaves the four-way valve 2 through the a port, and then returns to the compressor 3, thus completing a 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 .

In summer, the shallow seawater temperature is relatively high, generally at 27-35°C. The shallow seawater is used as the second seawater source, and the second seawater inlet II is connected to the shallow seawater. The temperature of the deep seawater is relatively low, and the temperature used is 13-18°C. The deep seawater is used as the first seawater source, and the first seawater inlet IV leads into the deep seawater.

In winter, the first seawater inlet IV leads into the deep seawater with higher water temperature, and the deep seawater is used as the second seawater source, the water temperature is generally 13-18°C, and the second seawater inlet II passes into the shallow seawater with lower water temperature, shallow The first layer of seawater is used as the first seawater source, and the water temperature is generally 0-7°C. Through the adjustment of the valve in the conduction selector, the high-temperature seawater in the deep layer flows to the seawater preheater 20 for preheating, and the low-temperature seawater in the shallow layer flows to the fresh water for condensation. The device 9 condenses the fresh water vapor output from the last effect, wherein the temperature of the first seawater source is lower than the temperature of the second seawater source.

Seawater desalination process:

In summer, the seawater desalination device closes valve B and valve C, opens valve A and valve 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 spraying device 9 (the seawater of the first effect distillation device is sprayed to the outside of the pipeline of the condenser 24), and is produced with the last effect in the evaporative condenser 21. The steam is heat-exchanged and evaporated, and part of the seawater is evaporated into steam, which passes through the gas-liquid separation device 10 and then enters the next-effect evaporative condenser 21 to exchange heat with the next-effect seawater; part of the seawater is concentrated into concentrated seawater, which is distilled by each effect The concentrated seawater at the bottom of the device flows out from the outlet channel, and after being depressurized by the seawater outlet decompression device 22-1~22-n-1, it is passed into the seawater preheater 20 to exchange heat with the imported shallow high-temperature seawater and then pass through the concentrated seawater outlet. The water pump 16 discharges, and the concentrated seawater outlet water pump 16 and the seawater preheater 20 are provided with a concentrated seawater outlet cut-off device 18 for controlling the discharge of the concentrated seawater; at the same time, the steam in the evaporative condenser 21 is cooled to fresh water after heat exchange, and passes through the fresh water outlet After the depressurization device 23-2～23-n-1 depressurizes, the seawater preheater 20 exchanges heat with the imported shallow high-temperature seawater and then discharges it from the fresh water outlet pump 15. A fresh water outlet cut-off device 19 is provided between them to control the discharge of fresh water. The seawater fed into the first-effect distillation unit 5 exchanges heat with the condenser 24 of the air-conditioning circulation unit, and the steam generated by the last-effect distillation unit 5 passes directly through the outlet of the gas-liquid separation unit 10 into the fresh water condenser 11 and the deep-layer low-temperature seawater. The heat exchange cools down, and then it is discharged together with the fresh water produced by other effects after heat exchange through the seawater preheater 20 .

Low-temperature seawater (deep low-temperature seawater passes through valve A in summer, and shallow low-temperature seawater passes through valve C in winter) passes through the first seawater inlet pump 13 and the first seawater inlet filter 12, enters the freshwater 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 heat required for the evaporation of seawater in the first-effect distillation device of seawater desalination is the low-temperature condensation heat of the air conditioner, and the temperature is about 40-50°C.

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 that is connected with vacuum pump 8, i= 1～n, turn on the vacuum pump 8, and pump each effect distillation device to the 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 connected to the vacuum pump 8, i=1～n, 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 the concentrated seawater outlet pump 16 , and then open the concentrated seawater outlet cut-off device 18 and the 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 using the low-temperature condensation heat of the air conditioner at 40-50°C.

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

When this embodiment is actually used,

Air conditioner parameters:

Power: 1.5P;

Cooling capacity: 3500W;

Refrigerant: R134a;

Summer time:

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

Condensing temperature of condenser: 54.4°C;

During winter:

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

Condensing temperature of indoor heat exchanger: 45°C;

Condensing temperature of condenser: 45°C;

Parameters of low temperature multiple effect distillation unit:

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;

The temperature of the first effect distillation unit: 50°C;

Final steam temperature: 18°C;

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;

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

Final effect steam temperature: 8°C;

The inlet flow rate of the second seawater source: 0.042kg/s.

Effect number: 12;

The simulated water production rate in summer is about: 0.018kg/s, about 65kg per hour, and 1.55 tons per day; the simulated water production rate in winter is about 0.014kg/s, about 50kg per hour, and about 1.55 tons per day It can reach 1.45 tons, and the heat output is about 3.6kW.

Claims (4)

1. a kind of Winter-summer dual purpose air-conditioning and the system of flat flow desalinization coproduction, including followed with refrigerating cycle unit and heating The air-conditioning of ring element, it is characterised in that also including flat flow low temperature multiple-effect distillation device, the flat flow low temperature multiple-effect distillation dress Put including：Multi-effect distilling unit, collect liquid fresh water fresh water collect pipeline, the outer comb of density wastewater for collecting end concentrated seawater, The fresh water condenser of the fresh water steam of last effect distillation unit output and the seawater preheating device of preheating seawater to be diluted are condensed, Each effect distillation unit is designed with preheating sea intake, and the concentrated seawater delivery port of each effect distillation unit, which is connected to outside density wastewater, to be arranged Pipe, the temperature of the fresh water steam of last effect distillation unit output are less than 20 DEG C；

The heating parts of the heating cycling element include indoor heat exchanger and the condensation heated by compressor compresses refrigerant Device, the heating cycling element and refrigerating cycle unit share same condenser, and the condenser is as the first effect distillation unit Condensation module；

The fresh water condenser includes fresh water steam channel and condensation water channel, the sea of both 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 both 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, and the ocean temperature for being passed through the second seawater inlet pipe is extra large higher than being passed through first The ocean temperature of water inlet pipe；

During air conditioner refrigerating, the ocean temperature for being passed through the first seawater inlet pipe is 13~18 DEG C, during air-conditioning heating, is passed through the first seawater and enters The ocean temperature of pipe is 0~7 DEG C；

During air conditioner refrigerating, the ocean temperature for being passed through the second seawater inlet pipe is 27~35 DEG C, during air-conditioning heating, is passed through the second seawater The ocean temperature of inlet pipe is 13~18 DEG C；The first seawater inlet pipe and the second seawater inlet pipe are connected with the conducting for exchanging water inlet Selector；The condenser heating temperature of the air-conditioning is 40~55 DEG C.

2. Winter-summer dual purpose air-conditioning as claimed in claim 1 and the system of flat flow desalinization coproduction, it is characterised in that described Seawater preheating device is triple channel heat exchanger, and triple channel is respectively product water channel, concentrated seawater passage and sea water passage.

3. Winter-summer dual purpose air-conditioning and the system of flat flow desalinization coproduction as described in claim 1~2 any claim, Characterized in that, described seawater preheating device is all connected with fresh water condenser using hot and cold stream countercurrent heat exchange method.

4. Winter-summer dual purpose air-conditioning and the system of flat flow desalinization coproduction as described in claim 1~2 any claim, Characterized in that, the heating parts of the heating cycling element include the outdoor heat exchanger for absorbing heat, the outdoor heat exchanger Including coolant channel and the 3rd sea water passage, the ocean temperature of the 3rd sea water passage is passed through higher than being passed through the first seawater inlet pipe Ocean temperature.