CN113137591B - Waste heat recovery multi-element utilization device for large kitchen - Google Patents

Abstract

The invention relates to a large kitchen waste heat recovery multi-utilization device which comprises a first heat exchanger connected with an air outlet of a range hood, wherein the first heat exchanger is also connected with a water collecting barrel, an air outlet pipe and a flash evaporator, a steam outlet at the top of the flash evaporator is connected with steam utilization equipment, the lower part of the flash evaporator is connected with a warm water tank, a waste water discharge pipe of the steam utilization equipment is connected with a second heat exchanger, the second heat exchanger is connected with the water collecting barrel and a liquid storage tank, a liquid outlet pipe is connected with an economizer, and the economizer is connected with a cold water tank. The invention can recover heat energy to produce hot water and high-temperature steam, and forcibly exchanges heat by utilizing the liquid phase change heat absorption principle through the economizer to produce cold water; the heat recovery is effectively utilized, the energy utilization efficiency is improved, the hot water requirement of cooking or other occasions is met, meanwhile, the working environment of a cooking place is improved due to the reduction of the smoke exhaust temperature, the fire hazard is eliminated, and the burden of a kitchen smoke exhaust system is reduced.

Description

Large-scale kitchen waste heat recovery multiple utilization device

technical field

The invention belongs to the technical field of heat energy recovery and utilization, and in particular relates to a large kitchen waste heat recovery multiple utilization device.

Background technique

At present, the whole world is facing the problem of energy shortage, so saving energy is particularly important. The kitchen will generate a lot of high-temperature fume and steam during work, and the heat is often discharged outdoors directly through the range hood, waste heat resources are wasted, resulting in huge energy consumption in the kitchen and heat pollution in the urban environment.

When a large kitchen is in normal use, a lot of heat is needed for washing vegetables, dishes, oil stains, food thawing, etc., and the cooling capacity is used for food refrigeration. At present, the use of waste heat resources in the kitchen is single, only preparing hot water, hot air, etc. , cannot meet the heat demand of various types in the kitchen, so additional energy is required to prepare steam, hot water and cold capacity.

Contents of the invention

The purpose of the present invention is to provide a large-scale kitchen waste heat recovery and multi-utilization device, which solves the problem that the current utilization of kitchen waste heat resources is single, and only prepares hot water, hot air, etc., which cannot meet the various heat needs of the kitchen, so additional energy is needed to Problems of preparing steam, hot water and cold.

The invention relates to a large-scale kitchen waste heat recovery and multiple utilization device, which includes a heat exchanger one connected to the air outlet of the range hood, and the heat exchanger one is also connected with a water collection bucket, an exhaust pipe and a flash evaporator, and the top of the flash evaporator is steam-exited. The port is connected to the steam utilization equipment, the lower part of the flash evaporator is connected to the warm water tank, the waste water discharge pipe of the steam utilization equipment is connected to the second heat exchanger, the second heat exchanger is connected to the water collection bucket and the liquid storage tank, the liquid storage tank is connected to the economizer, and the economizer Connect the cold water tank.

The first heat exchanger is equipped with a heat exchange coil, one end of the heat exchange coil is connected to the circulating water pump, the circulating water pump is connected to the water collection bucket, the other end of the heat exchange coil is connected to the flash evaporator, and the air outlet of the range hood passes through the air inlet pipe Connect the inlet of heat exchanger one, and connect the outlet of heat exchanger one to the exhaust pipe extending outside. The heat exchanger is used to absorb the waste heat of the range hood to heat the circulating water, and then the circulating water is used to produce steam for steam demand. The interior of the flash evaporator is in a low-pressure state, and the circulating water will quickly vaporize when it reaches the interior of the flash evaporator after heat exchange, forming a gas-liquid two-phase inside the flash evaporator. After the gas-liquid phases are separated, the required hot water and low-temperature steam can be obtained.

The air inlet pipe is provided with a fan, and the outer surfaces of the fan and the heat exchange coil are coated with a non-stick coating. Avoid the attachment of oil droplets, small solid particles and water droplets in the oil fume, which will affect the system operation results.

The outlet of heat exchanger 1 is connected to the expansion valve, the expansion valve is connected to the liquid storage tank, the liquid storage tank is connected to the evaporator, the refrigerant outlet of the evaporator is connected to the gas-liquid separator, and the gas-liquid separator is connected to the refrigerant compressor. The outlet of the agent compressor is connected to the inlet of heat exchanger 1, the air inlet of the evaporator is connected to the air inlet pipe, the air outlet of the evaporator is connected to the exhaust pipe, and the inner wall of the heat exchange pipe connecting the evaporator to the exhaust pipe is coated with a non-stick coating . It can make the overall operation safer and more reliable, and the operation is more stable.

The exterior of the heat exchanger 1 is wrapped with a phase-change heat storage material layer. Excess heat can be stored through material phase changes. The phase change heat storage material layer adopts fatty acid as the organic heat storage phase change material, its general formula is CH3(CH2)2n COOH, its phase change enthalpy range is 50J/g～150J/g, and the phase change temperature range is - 15～70℃.

A steam compressor is arranged between the flash evaporator and the steam utilization equipment, and the steam compressor is connected with a water injection pump. The steam compressor is a Roots steam compressor or a wet screw compressor with a strong boosting capacity, and the boosting capacity can reach 85Kpa.

There is a thermal compensator between the steam compressor and the steam utilization equipment, which can adjust whether to continue heating the positive pressure saturated steam through the switch, and can realize the output of saturated steam under different pressures to meet the steam demand of various purposes. The flash evaporator and the warm water tank There is a thermal compensator 2 between them, and through the switch to adjust whether to continue heating hot water, hot water output at different temperatures can be realized to meet the needs of the kitchen for hot water at different temperatures. On the one hand, the steam compressor provides a negative pressure environment for the hot water cycle flash evaporation to ensure that the hot water boils and evaporates in a low temperature environment, thereby continuously flashing steam, making full use of the advantages of high energy efficiency ratio of the heat pump cycle system, and improving the efficiency of the heat pump in the heat pump steam unit. The proportion of heating heat; on the other hand, increase the pressure of the steam and the corresponding temperature in the saturated state, pressurize and heat up the steam from the outlet of the flash evaporator, and the steam at the outlet of the flash evaporator will become positive Saturated steam under high pressure is convenient for steam storage and further heating and utilization.

The waste water inlet of heat exchanger 2 is connected to the waste water discharge pipe of the steam utilization equipment, the waste water outlet of heat exchanger 2 is connected to the liquid storage tank, the compensation inlet of heat exchanger 2 is connected to the compensation pipe, and the compensation outlet of heat exchanger 2 is connected to the water collection bucket. The compensation pipe is connected to the liquid separator, the inlet of the liquid separator is connected to the supplementary water pump, and the other outlet of the liquid separator is connected to the cold water inlet of the economizer. Easy to refill with cold water.

The waste water inlet of the economizer is connected to the liquid storage tank, the waste water outlet of the economizer is connected to the discharge pipe, and the cold water outlet of the economizer is connected to the cold water tank.

The discharge pipe is connected with a gas-liquid separation tank, the top of the gas-liquid separation tank is connected with a circulation pipe, and the other end of the circulation pipe is connected with a steam compressor. The economizer plates are divided into heating side and condensation side; the heating side is the side where hot water expands at low pressure to undergo phase change and gasification, and the condensation side is the side where tap water flows through and undergoes forced heat exchange, and the plates condense The upper end of the side is provided with a medium-temperature and low-pressure gaseous working medium inlet, and the lower end is provided with a high-temperature and low-pressure working medium outlet; the medium-temperature and low-pressure gaseous working medium inlet is connected with the steam utilization equipment through a check valve, and the tap water stream that loses heat is in a state of normal pressure and low temperature , connected to the water collection device through the liquid outlet, and can be used as a cold source for the kitchen. The hot water passing through the expansion valve undergoes a phase change gasification process, absorbs a large amount of heat, flows out from the outlet of the high-temperature and low-pressure working medium, and then enters the separation tank. The water vapor separated from the gas-liquid in the separation tank is a gaseous working medium, and finally enters the steam compressor. complete the cycle within.

A valve is provided between the circulating water pump and the water collecting bucket, and a delivery pump is provided between the second heat exchanger and the steam utilization equipment. Easy to open and close.

The thermal compensator 1, the thermal compensator 2, the water injection pump and the supplementary water pump can be connected to the PLC controller. Using the control system, it has the functions of heat storage, water supply control, temperature rise control, multi-level waste heat recovery, etc., with reasonable control components and The principle of scientifically coordinated heat exchange, heating, and reheating constitutes a central control module for waste heat recovery; it solves the defects of unstable water temperature and waste of resources in traditional waste heat recovery and utilization systems, and has significant market application potential.

Compared with the prior art, the present invention has the advantages of:

Through the heat exchanger, the hot air discharged from the range hood is exchanged with the tap water added to the heat exchanger one, and the flash compression technology is used to produce hot water and high-temperature steam, and the economizer is forced to use the principle of liquid phase change to absorb heat Heat exchange to produce cold water; in the kitchen operation stage, through water-air heat exchange, the large amount of heat carried in the high-temperature air in the kitchen is fully absorbed and utilized; without affecting the cooking effect, use waste heat to produce steam, hot water and Cold water, effective use of heat recovery, not only improves energy utilization efficiency, solves the hot water demand for cooking or other occasions, but also improves the working environment of cooking places due to the reduction of exhaust gas temperature, eliminates fire hazards, and reduces the burden on the kitchen exhaust system . Moreover, the user's energy consumption is greatly reduced, energy saving and environmental protection, water saving and electricity saving can increase production efficiency, and the use effect is good.

Refrigerants play the most important role in heat pumps. The thermophysical properties of refrigerants limit the performance of heat pumps. Using low-GWP refrigerants-water for heat pumps can effectively improve the quality of low-grade energy and reduce primary energy consumption. Energy consumption. Water is the representative of the fourth generation of natural refrigerants, with the advantages of 0ODP and GWP, non-toxic, non-flammable, good stability and durability. No pollution to the environment during use

While using water as the refrigerant, at the same time, the water absorbs and releases heat during the operation of the device to undergo different phase changes and temperatures to generate steam, hot water, and cold water, perfectly realizing the use of different phase states of water , It can be said to kill two birds with one stone.

The hot water and cold water generated during the operation of the device can also be used in other aspects. The hot water can be used for the heat source of the radiator in winter, and the cold water can be used for water cooling of the air conditioner in summer. It greatly reduces the energy consumption of building air conditioning, cooling and heating.

The kitchen waste heat utilization system is equipped with a phase change heat storage module, which saves space and achieves the effect of compact structure and concentrated heat utilization.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of heat exchanger one;

Fig. 3 is the structural representation of another embodiment of the present invention;

In the figure: 1. Water collection bucket, 2. Circulating water pump, 3. Fan, 4. Heat exchanger 1, 5. Flash evaporator, 6. Steam compressor, 7. Thermal compensator 1, 8. Steam utilization equipment, 9. Gas-liquid separation tank, 10, economizer, 11, heat exchanger 2, 12, liquid storage tank, 13, water injection pump, 14, liquid separator, 15, water supply pump, 16, thermal compensator 2, 17, phase change Heat storage material layer, 18, warm water tank, 19, cold water tank, 20, delivery pump, 21, heat exchange coil, 22, exhaust pipe, 23, air intake pipe, 24, circulation pipe, 25, evaporator, 26 . Liquid storage tank, 27. Gas-liquid separator, 28. Refrigerant compressor, 29. Expansion valve.

detailed description

The specific implementation manners of the present invention will be described in further detail below with reference to the accompanying drawings.

Embodiment 1, as shown in Figures 1 to 2, the present invention is a large-scale kitchen waste heat recovery multiple utilization device, including a heat exchanger 4 connected to the air outlet of the range hood, and the heat exchanger 4 is also connected to the water collection bucket 1, Exhaust pipe 22 and flash evaporator 5, the top steam outlet of flash evaporator 5 is connected with steam utilization equipment 8, the bottom of flash evaporator 5 is connected with warm water tank 18, and the waste water discharge pipe of steam utilization equipment 8 is connected with heat exchanger 2 11, The second heat exchanger 11 is connected to the water collection bucket 1 and the liquid storage tank 12 , the liquid storage tank 12 is connected to the economizer 10 , and the economizer 10 is connected to the cold water tank 19 .

The heat exchanger-4 is provided with a heat exchange coil 21, one end of the heat exchange coil 21 is connected to the circulating water pump 2, the circulating water pump 2 is connected to the water collection bucket 1, and the other end of the heat exchange coil 21 is connected to the flash evaporator 5, and the pumping The air outlet of the range hood is connected to the air inlet of the heat exchanger one 4 through the air inlet duct 23, and the air outlet of the heat exchanger one 4 is connected to the exhaust pipe 22 extending out of the room.

The air inlet pipe 23 is provided with a fan 3, and the outer surfaces of the fan 3 and the heat exchange coil 21 are coated with a non-stick coating.

The exterior of the heat exchanger one 4 is wrapped with a phase change heat storage material layer 17 .

A steam compressor 6 is provided between the flash evaporator 5 and the steam utilization equipment 8 , and the steam compressor 6 is connected with a water injection pump 13 .

A thermal compensator 1 7 is provided between the steam compressor 6 and the steam utilization device 8 , and a thermal compensator 2 16 is provided between the flash evaporator 5 and the warm water tank 18 .

The waste water inlet of heat exchanger two 11 is connected to the waste water discharge pipe of steam utilization equipment 8, the waste water outlet of heat exchanger two 11 is connected to liquid storage tank 12, the compensation inlet of heat exchanger two 11 is connected to compensation pipe, and the waste water outlet of heat exchanger two 11 is connected to the compensation pipe. The compensation outlet is connected to the water collection bucket 1 , the compensation pipe is connected to the liquid separator 14 , the inlet of the liquid separator 14 is connected to the supplementary water pump 15 , and the other outlet of the liquid separator 14 is connected to the cold water inlet of the economizer 10 .

The waste water inlet of the economizer 10 is connected to the liquid storage tank 12 , the waste water outlet of the economizer 10 is connected to the discharge pipe, and the cold water outlet of the economizer 10 is connected to the cold water tank 19 .

The discharge pipe is connected with a gas-liquid separation tank 9 , the top of the gas-liquid separation tank 9 is connected with a circulation pipe 24 , and the other end of the circulation pipe 24 is connected with a steam compressor 6 .

A valve is provided between the circulating water pump 2 and the water collecting barrel 1 , and a delivery water pump 20 is provided between the heat exchanger 2 11 and the steam utilization device 8 . The steam utilization device 8 may be a steam dishwasher. Port A1 of heat exchanger 4 is connected to port A2, B1 is connected to port B2, port C1 of heat exchanger 11 is connected to port C2, port D1 is connected to port D2, port E1 of economizer 10 is connected to port E2, and port F1 Connected with F2. The E1 port of the economizer 10 is connected with an expansion valve.

Methods of generating steam and hot water:

1. Tap water preheating: Turn on the steam compressor 6, and the refrigerant water vapor is compressed into a high-temperature and high-pressure gaseous working medium by the steam compressor 6, and enters the steam utilization equipment 8 to condense into a liquid state, and the obtained liquid water at medium temperature and normal pressure, the liquid water and the replenishment pump 15. After heat exchange and cooling in the plate heat exchanger 2 11, the input tap water further enters the economizer 10 for expansion and gasification, and enters the steam compressor 6 after gas-liquid separation in the gas-liquid separation tank 9 to complete the cycle process; The plate heat exchanger 2 11 is preheated to 30±5°C and then enters the water collection bucket 1;

2. The hot water circulates and flashes, pressurizes and heats up to prepare steam, and separates hot water: the water refrigerant enters the heat exchanger 1 through the circulating water pump 2, and then exchanges heat with the hot air and high-temperature oil fume in the kitchen space, absorbing a large amount of heat , enter the low-pressure flash evaporator 5 after heating up, and the working medium water evaporates rapidly into a gaseous working medium under low pressure conditions; control the liquid level in the flash evaporator 5 to be higher than the position of the hot water outlet of the heat exchanger 4, and the pressure in the flash evaporator 5 is less than The saturation pressure corresponding to the hot water outlet temperature of heat exchanger 4 forms a flash environment. The gas-liquid mixture composed of hot water and gas in the flash evaporator 5 is continuously evaporated and transported upwards to complete the steam-water separation process. The steam from the 5 tanks of the flash evaporator The top of the body enters the steam compressor 6 to increase the temperature and pressure to above 100°C, and then enters the thermal compensator 17 to heat to the required temperature of 110-180°C to obtain steam at the required temperature; the steam comes out from the steam outlet c and enters the steam utilization equipment 8 utilization, after the hot water cools down in the flasher 5, it enters the thermal compensator 16 to be heated to the required temperature from the hot water outlet at the bottom of the flasher 5, and then enters the warm water tank 18 from the warm water outlet a to be used.

To generate cold water:

1. Secondary heat exchange of hot water: Turn on the steam compressor 6, and the refrigerant water vapor is compressed into a high-temperature and high-pressure gaseous working medium by the steam compressor 6 and enters the steam utilization equipment 8 to condense into a liquid state, and the obtained liquid water at medium temperature and normal pressure, the liquid state The water and the tap water input by the supplementary water pump 15 are heat-exchanged and cooled in the plate heat exchanger 11, then further enter the economizer 10 for expansion and gasification, and enter the steam compressor 6 after the gas-liquid separation in the gas-liquid separation tank 9 to complete the cycle process; At the same time, tap water at normal temperature is preheated to 30±5°C by the plate heat exchanger 2 11 and then enters the water collection bucket 1;

2. The heat loss process of tap water: After the above-mentioned steps in 1, the medium-temperature hot water after a heat exchange is performed again, and the medium-temperature hot water at the outlet of plate heat exchanger No. connected to the economizer 10 to carry out the depressurization and gasification process, and at the same time, the tap water diverted from the supplementary water pump 15 is forced to exchange heat in the economizer 10, and the medium-temperature hot water expands and gasifies, and the required heat comes from the tap water. After the hot water is gasified The separated low-pressure steam enters the steam compressor 6 for the next round of circulation; the temperature of the tap water after the forced heat exchange drops significantly, and is discharged from the upper outlet of the economizer 10, and enters the cold water through the cold water outlet c Stand-by in case 19, can use as kitchen cold source.

Embodiment 2 is different from Embodiment 1 in that the outlet of the heat exchanger 4 is connected to the expansion valve 29, the expansion valve 29 is connected to the liquid storage tank 26, the liquid storage tank 26 is connected to the evaporator 25, and the refrigerant in the evaporator 25 The outlet is connected to the gas-liquid separator 27, the gas-liquid separator 27 is connected to a refrigerant compressor 28, the outlet of the refrigerant compressor 28 is connected to the inlet of the heat exchanger-4, the air inlet of the evaporator 25 is connected to the air inlet pipe 23, and the evaporator The air outlet of 25 is connected with the exhaust pipe 22, and the inner wall of the heat exchange pipe where the evaporator 25 communicates with the exhaust pipe 22 is coated with a non-stick coating.

In summary, the present invention uses the refrigerant to absorb the heat of the hot air discharged from the range hood through the evaporator. After absorbing the heat, the refrigerant is heated and pressurized by the compressor and then exchanges heat with the tap water added to the heat exchanger 1. Evaporation and compression technology, producing hot water and high-temperature steam, through the economizer, using the principle of liquid phase change heat absorption to force heat exchange to produce cold water; in the kitchen operation stage, through water-gas heat exchange, the high-temperature air in the kitchen The large amount of heat carried is fully absorbed and utilized; on the premise of not affecting the cooking effect, the waste heat is used to produce steam, hot water and cold water, and the heat recovery is effectively used, which not only improves energy utilization efficiency, solves the hot water demand for cooking or other occasions, but also Due to the reduction of the exhaust gas temperature, the working environment of the cooking place is improved, the fire hazard is eliminated, and the burden on the kitchen exhaust system is reduced. Moreover, the user's energy consumption is greatly reduced, energy saving and environmental protection, water saving and electricity saving can increase production efficiency, and the use effect is good. The refrigerant plays the most important role in the heat pump. The thermophysical properties of the refrigerant limit the performance of the heat pump. The refrigerant used in the refrigerant cycle is R245fa. This working fluid does not destroy the ozone layer and meets the requirements of environmental protection. It is non-toxic and non-flammable. , its thermal performance and thermal parameters are good, can be directly used in heat pump units, can effectively improve the quality of low-grade energy and reduce primary energy consumption. In addition, a low-GWP refrigerant is used in the water-vapour cycle-water is used in heat pumps. In terms of waste heat recovery, water is the representative of the fourth generation of natural refrigerants, with the advantages of 0ODP and GWP, non-toxic and non-flammable, good stability and durability . It will not cause pollution to the environment during use. While using water as the refrigerant, at the same time, the water absorbs and releases heat during the operation of the device to undergo different phase changes and temperatures to generate steam, hot water, and cold water, perfectly realizing the use of different phase states of water , It can be said to kill two birds with one stone. The hot water and cold water generated during the operation of the device can also be used in other aspects. The hot water can be used for the heat source of the radiator in winter, and the cold water can be used for water cooling of the air conditioner in summer. It greatly reduces the energy consumption of building air conditioning, cooling and heating. The kitchen waste heat utilization system is equipped with a phase change heat storage module, which saves space and achieves the effect of compact structure and concentrated heat utilization.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

In the description of the present invention, the orientation or positional relationship indicated by the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom" etc. are based on the drawings The orientations or positional relationships shown are only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation, and thus should not be construed as limitations on the invention.

Claims (6)

1. A large-scale kitchen waste heat recovery multi-utilization device, characterized in that it includes a heat exchanger one (4) connected to the air outlet of the range hood, and the heat exchanger one (4) is also connected with a water collection bucket (1), a drain The air pipe (22) and the flash evaporator (5), the top steam outlet of the flash evaporator (5) is connected to the steam utilization equipment (8), the lower part of the flash evaporator (5) is connected to the warm water tank (18), and the steam utilization equipment (8 ) is connected to the second heat exchanger (11), the second heat exchanger (11) is connected to the water collection bucket (1) and the liquid storage tank (12), and the liquid storage tank (12) is connected to the economizer (10). The device (10) is connected to the cold water tank (19); a steam compressor (6) is installed between the flasher (5) and the steam utilization equipment (8), and the steam compressor (6) is connected to a water injection pump (13); The waste water inlet of the second heat exchanger (11) is connected to the waste water discharge pipe of the steam utilization equipment (8), the waste water outlet of the heat exchanger two (11) is connected to the liquid storage tank (12), and the compensation inlet of the heat exchanger two (11) is connected to the compensation Pipe, the compensation outlet of heat exchanger 2 (11) is connected to the water collection bucket (1), the compensation pipe is connected to the liquid distributor (14), the inlet of the liquid distributor (14) is connected to the supplementary water pump (15), and the liquid distributor (14) The other outlet of the economizer (10) is connected to the cold water inlet of the economizer (10); the waste water inlet of the economizer (10) is connected to the liquid storage tank (12), the waste water outlet of the economizer (10) is connected to the discharge pipe, and the cold water outlet of the economizer (10) Connect the cold water tank (19); the discharge pipe is connected to the gas-liquid separation tank (9), the top of the gas-liquid separation tank (9) is connected to the circulation pipe (24), and the other end of the circulation pipe (24) is connected to the steam compressor (6) , a valve is provided between the circulating water pump (2) and the water collection bucket (1), and a delivery pump (20) is provided between the heat exchanger 2 (11) and the steam utilization equipment (8); tap water preheating: turn on the steam compressor (6), the refrigerant water vapor is compressed by the steam compressor (6) into a high-temperature and high-pressure gaseous working medium and enters the steam utilization equipment (8) to condense into a liquid state, and the liquid water at medium temperature and normal pressure is obtained, and the liquid water is input with the water supply pump (15) After heat exchange and cooling in the plate heat exchanger 2 (11), the tap water further enters the economizer (10) for expansion and gasification, and after the gas-liquid separation in the gas-liquid separation tank (9), enters the steam compressor (6) to complete the cycle process; at the same time, tap water at normal temperature is preheated by the plate heat exchanger 2 (11), and then enters the water collection bucket (1); the hot water is circulated and flashed, pressurized and heated to prepare steam, and hot water is separated: the water refrigerant enters the heat exchanger 1 (4) After exchanging heat with the hot air in the kitchen space and high-temperature oil fume, a large amount of heat is absorbed, and after heating up, it enters the low-pressure flash evaporator (5), and the working medium water evaporates rapidly into a gaseous working medium under low pressure conditions; the flash evaporator ( 5) The gas-liquid mixture composed of hot water and gas is continuously evaporated and transported upwards to complete the steam-water separation process. The steam enters the steam compressor (6) from the top of the flasher (5) to raise the temperature and pressure, and then enters the thermal compensator One (7) is heated to the required temperature to obtain steam at the required temperature; the steam comes out from the steam outlet and enters the steam utilization device (8) for utilization, and the hot water is flashing After cooling down in the flash evaporator (5), the hot water outlet goes out from the bottom of the flasher (5), and then enters the warm water tank (18) from the warm water outlet to be used. 2. The large-scale kitchen waste heat recovery multiple utilization device according to claim 1, characterized in that: said heat exchanger one (4) is provided with a heat exchange coil (21), and one end of the heat exchange coil (21) is connected to The circulating water pump (2), the circulating water pump (2) is connected to the water collection bucket (1), and the other end of the heat exchange coil (21) is connected to the flash evaporator (5). 3. The large-scale kitchen waste heat recovery and multiple utilization device according to claim 2, characterized in that: the air outlet of the range hood is connected to the inlet of the heat exchanger one (4) through the air inlet pipe (23), and the heat exchanger one The outlet of (4) is connected to the exhaust pipe (22) extending outside, the air inlet pipe (23) is provided with a fan (3), and the outer surfaces of the fan (3) and the heat exchange coil (21) are coated with different Dip coating. 4. The large-scale kitchen waste heat recovery multiple utilization device according to claim 2, characterized in that: the outlet of heat exchanger one (4) is connected to an expansion valve (29), and the expansion valve (29) is connected to a liquid storage tank (26) , the liquid storage tank (26) is connected to the evaporator (25), the refrigerant outlet of the evaporator (25) is connected to the gas-liquid separator (27), and the gas-liquid separator (27) is connected to the refrigerant compressor (28), The outlet of the refrigerant compressor (28) is connected to the inlet of heat exchanger one (4), the air inlet of the evaporator (25) is connected to the air inlet pipe (23), and the air outlet of the evaporator (25) is connected to the exhaust pipe (22) , the evaporator (25) communicates with the heat exchange pipe inner wall of the exhaust pipe (22) and is coated with a non-stick coating. 5. The large-scale kitchen waste heat recovery multi-utilization device according to claim 3 or 4, characterized in that: the heat exchanger one (4) is wrapped with a phase change heat storage material layer (17). 6. The large-scale kitchen waste heat recovery multiple utilization device according to claim 5, characterized in that: a heat compensator (7) is provided between the steam compressor (6) and the steam utilization equipment (8), and the flash evaporator (5 ) and the warm water tank (18) are provided with thermal compensator two (16).

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