A green and energy-saving cooking fume waste heat recovery system and working method

Abstract

The invention discloses a green and energy-saving oil fume waste heat recovery system, comprising an oil fume system, a circulating water system, a heat pump system and a tap water system; the circulating water system is used for recovering the waste heat of high-temperature oil fume in the oil fume system, the heat pump system is used for absorbing the heat of circulating water in the circulating water system and heating the tap water in the tap water system; the invention also comprises an air-conditioning system and a switching pipe system, the heat exchanger of the outdoor unit of the air-conditioning system is connected with the circulating water system and the tap water system through the switching pipe system, the heat exchanger of the outdoor unit of the air-conditioning system is heat-exchanged with the circulating water in the circulating water system or with the tap water in the tap water system; the heat exchanger and the circulating water or the heat exchanger and the tap water are switched through the switching pipe system; the waste heat of oil fume is used for indoor heating in winter, and the indoor heat is used for producing domestic hot water in summer, so that more domestic hot water can be produced while the indoor temperature is lowered, thereby meeting the user's demand for domestic hot water.

Description

Technical Field

[0001] The invention relates to a green and energy-saving cooking fume waste heat recovery system and a working method, belonging to the technical field of cooking fume waste heat recovery. Background Art

[0002] Food preparation methods include frying, stir-frying, cooking, and deep-frying, etc., which will produce a lot of oil smoke. The oil smoke contains water vapor, complex organic matter, fuel combustion particles, etc., and its temperature is as high as 60°C. Directly discharging it to the outdoors will cause serious pollution to the atmospheric environment and cause energy waste. At present, the treatment of oil smoke mainly focuses on the control of pollutants, and there is less research on the recovery of waste heat from oil smoke. Every household kitchen, canteen kitchen, restaurant kitchen, etc. will produce a lot of oil smoke. The amount of oil smoke is large and the temperature is high. The waste heat is not recycled and directly discharged to the outdoors, causing serious energy waste. Washing vegetables and dishes in the kitchen requires a lot of sanitary hot water. If the waste heat in the oil smoke is converted into domestic water, it can save energy while protecting the environment. It is a field worthy of study.

[0003] In the traditional oil fume waste heat recovery process, even if the oil fume has been processed in the oil filter, it still contains a large amount of complex organic matter, fuel combustion particles and other harmful substances. If the oil fume directly enters the heat pump system, it will corrode the evaporator, affect the operation of the heat pump system, and reduce the service life of the heat pump system; the accumulation of oil on the surface of the evaporator will also cause its heat exchange efficiency to decrease, thereby affecting the efficiency of oil fume waste heat recovery;

[0004] At the same time, air conditioning systems are needed to heat the interior of buildings in winter and to discharge indoor heat in summer. In the prior art, no relevant technology has been found for using waste heat from oil smoke for indoor heating in winter, and few relevant technologies have been found for using indoor heat to heat and produce domestic hot water in summer. Summary of the invention

[0005] In order to fill the relevant technical gap in the above-mentioned prior art, the present invention provides a green and energy-saving oil fume waste heat recovery system, and discloses the working method of the oil fume waste heat recovery system; the oil fume waste heat is recovered by a heat pump system plus a circulating water system and used for heating to produce domestic hot water, thereby ensuring the smooth operation of the heat pump system and reducing the impact of dirty oil fume on the heat pump system; and it can also realize the use of oil fume waste heat for indoor heating in winter and the use of indoor heat for heating to produce domestic hot water in summer, thereby achieving indoor cooling while producing more domestic hot water, meeting the user's demand for domestic hot water.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A green and energy-saving oil fume waste heat recovery system, comprising an oil fume system, a circulating water system, a heat pump system and a tap water system; the circulating water system is used to recover the waste heat of high-temperature oil fume in the oil fume system, and the heat pump system is used to absorb the heat of circulating water in the circulating water system and heat the tap water in the tap water system;

[0008] It also includes an air-conditioning system and a switching pipe system. The heat exchanger of the outdoor unit of the air-conditioning system is connected to the circulating water system and the tap water system through the switching pipe system. The heat exchanger of the outdoor unit of the air-conditioning system exchanges heat with the circulating water in the circulating water system or with the tap water in the tap water system; the heat exchange between the heat exchanger and the circulating water or the heat exchanger and the tap water is switched through the switching pipe system.

[0009] As a further preferred embodiment of the present invention, the outdoor unit of the air-conditioning system has a heat exchange box, and the heat exchanger of the outdoor unit is arranged inside the heat exchange box; the heat exchange box is connected in series to the circulating water system, in series to the tap water system, or in parallel to the tap water system by switching the pipeline system; it is convenient to switch the circulating water or tap water for heat exchange with the heat exchanger by switching the pipeline system.

[0010] As a further preferred embodiment of the present invention, the switching pipeline system includes a first pipeline, a circulating water auxiliary stop valve, a second pipeline, a tap water auxiliary flow regulating valve, a third pipeline, a first switching stop valve, a fourth pipeline, and a second switching stop valve;

[0011] The outlet end of the circulating pump of the circulating water system is connected to the inlet end of the heat exchange box through the first pipeline, and the circulating water auxiliary stop valve is arranged on the first pipeline;

[0012] The outlet end of the tap water pump of the tap water system is connected to the inlet end of the heat exchange box through a second pipeline, and the tap water auxiliary flow regulating valve is arranged on the second pipeline;

[0013] The outlet end of the heat exchange box is connected to the inlet end of the first heat exchange box of the circulating water system through a third pipeline, and the first switching stop valve is arranged on the third pipeline;

[0014] The outlet end of the heat exchange box is connected to the hot water tank of the tap water system through a fourth pipe, and the second switching stop valve is arranged on the fourth pipe.

[0015] As a further preferred embodiment of the present invention, the tap water auxiliary flow regulating valve is an electric flow regulating valve;

[0016] The switching pipeline system also includes a temperature sensor and a PLC controller. The temperature sensor is arranged at the return air outlet of the indoor unit of the air-conditioning system. The temperature sensor is connected to the PLC controller for communication. The PLC controller is electrically connected to the electric flow regulating valve. The PLC controller controls the opening of the electric flow regulating valve according to the output signal of the temperature sensor. When the air-conditioning system is in cooling operation, the indoor temperature is relatively high at the beginning. Therefore, the heat dissipated by the heat exchanger of the outdoor unit of the air-conditioning system is relatively high. The PLC controller controls the opening of the electric flow regulating valve to be larger according to the output signal of the temperature sensor, so that the flow rate of tap water is increased to ensure the cooling effect of the tap water on the heat exchanger. The tap water after heat exchange with the heat exchanger is heated up to become domestic hot water and flows into the hot water tank of the tap water system. As the indoor temperature decreases, the heat dissipated by the heat exchanger of the outdoor unit of the air-conditioning system decreases. The PLC controller controls the opening of the electric flow regulating valve to be smaller according to the output signal of the temperature sensor, so that the flow rate of tap water is reduced. The opening of the electric flow regulating valve can be controlled according to the change of the indoor temperature. The higher the indoor temperature, the larger the opening of the electric flow regulating valve.

[0017] As a further preference of the present invention, the heat exchanger body is a cylindrical barrel structure, an inlet is arranged at one end of the heat exchanger body, and an outlet is arranged at the other end, the heat exchanger of the outdoor unit of the air-conditioning system is arranged inside the heat exchanger body, and the copper tube of the heat exchanger passes through the side wall of the heat exchanger body and is welded and sealed to the side wall of the heat exchanger body; the heat exchanger and the heat exchanger body are integrated together to form a modular structure, which is convenient for later maintenance.

[0018] As a further preference of the present invention, the copper tubes of the heat exchanger located inside the heat exchange box are coiled to form a polygonal columnar structure, the axis of the polygonal columnar heat exchanger coincides with the axis of the heat exchange box, and a flow channel for the heat exchange fluid is formed between two adjacent prisms on the polygonal columnar heat exchanger; conical end covers are respectively arranged at the axial centers of both ends of the polygonal columnar heat exchanger; the polygonal columnar heat exchanger is extended along the length direction of the heat exchange box, which is consistent with the flow direction of the fluid and facilitates the flow of the fluid; the conical end cover facing the inlet of the heat exchange box is used to guide the fluid entering the inside of the heat exchange box, and the conical end cover facing the outlet of the heat exchange box is used to guide the fluid flowing out of the inside of the heat exchange box.

[0019] As a further preference of the present invention, a plurality of heat-conducting fins are connected between two adjacent prisms in the polyhedral prism-shaped heat exchanger, the plurality of heat-conducting fins are parallel to each other, and the gap between two adjacent heat-conducting fins constitutes a flow channel for the heat exchange fluid; the contact surface between the heat exchanger and the fluid is increased, the heat exchange area of ​​the heat exchanger is increased, the heat exchange efficiency of the heat exchanger is improved, and at the same time, it has a guiding effect on the heat exchange fluid.

[0020] As a further preferred embodiment of the present invention, a filtering device is detachably connected to the inlet of the heat exchange box to filter the fluid to prevent impurities in the fluid from entering the interior of the heat exchange box.

[0021] A working method of a green and energy-saving oil fume waste heat recovery system is as follows:

[0022] When the air conditioning system is working for heating, the switching pipeline system is switched so that the heat exchange box is connected in series to the circulating water system; after the circulating water system is working, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the heat exchange box and the first heat exchange box in sequence, and the heat exchanger of the outdoor unit of the air conditioning system exchanges heat with the circulating water flowing inside the heat exchange box, and the heat exchanged by the heat exchanger of the outdoor unit of the air conditioning system is used for indoor heating;

[0023] When the air-conditioning system is in cooling operation, the switching pipeline system is switched to connect the heat exchange box in series or in parallel with the tap water system; after the tap water system is working, the tap water in the tap water system flows through the heat exchange box, and the heat exchanger of the outdoor unit of the air-conditioning system exchanges heat with the tap water flowing through the inside of the heat exchange box, the heat exchanger of the outdoor unit of the air-conditioning system dissipates heat for indoor cooling, and the heat exchanger of the outdoor unit of the air-conditioning system dissipates heat for heating the tap water, and the heated tap water flows into the hot water tank of the tap water system.

[0024] As a further preferred embodiment of the method of the present invention, when the air-conditioning system is working for heating, the heat pump system and the tap water system start working or stop working; if the heat pump system and the tap water system start working, the circulating water in the circulating water system exchanges heat with the heat exchanger inside the heat exchange box, and then exchanges heat with the evaporator of the heat pump system inside the first heat exchange box; at this time, the heat of the circulating water can be absorbed by the air-conditioning system for indoor heating, and can also be absorbed by the heat pump system for heating tap water; if the heat pump system and the tap water system stop working, the circulating water in the circulating water system only exchanges heat with the heat exchanger inside the heat exchange box, and does not exchange heat with the evaporator of the heat pump system inside the first heat exchange box; at this time, the heat of the circulating water will only be absorbed by the air-conditioning system for indoor heating;

[0025] When the air-conditioning system is working in cooling mode, the circulating water system and the heat pump system start or stop working; if the circulating water system and the heat pump system start working, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the first heat exchange box; the circulating water in the circulating water system exchanges heat with the evaporator of the heat pump system inside the first heat exchange box; at this time, the heat of the circulating water is absorbed by the heat pump system and used to heat the tap water, thereby realizing the synchronous production of domestic hot water with the air-conditioning system; if the circulating water system and the heat pump system stop working, only the air-conditioning system uses the indoor heat to heat and produce domestic hot water.

[0026] The present invention is beneficial in that:

[0027] (1) The present invention sets a circulating water system between the heat pump system and the oil fume system so that the heat pump system does not come into direct contact with the oil fume, thereby ensuring efficient heat exchange and effectively preventing the oil fume from directly participating in the operation of the heat pump system. The oil fume will not corrode the heat pump system, and the heat pump system will not be affected by dirty oil fume while efficiently recovering the waste heat of the oil fume. The heat pump system plus the circulating water system are used to recover the waste heat of the oil fume and use it for heating to produce domestic hot water, thereby ensuring the stable operation of the heat pump system and reducing the impact of dirty oil fume on the heat pump system.

[0028] (2) The present invention incorporates an air conditioning system to achieve indoor heating using waste heat from cooking fumes in winter and indoor heating to produce domestic hot water in summer, thereby achieving indoor cooling while producing more domestic hot water to meet users' demand for domestic hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the connection relationship between various systems of the present invention;

[0030] Figure 2 It is a pressure-enthalpy diagram of the refrigerant cycle process of the heat pump system and the air conditioning system of the present invention;

[0031] Figure 3 It is a schematic diagram of the heat exchange box structure of the outdoor unit of the air-conditioning system of the present invention;

[0032] Figure 4 yes Figure 3 Schematic diagram of the internal structure of the inlet end of the middle heat exchange box;

[0033] Meaning of the reference numerals in the figures:

[0034] 1-first heat exchange box, 2-second heat exchange box, 3-first pipeline, 4-circulating water auxiliary stop valve, 5-second pipeline, 6-tap water auxiliary flow regulating valve, 7-third pipeline, 8-first switching stop valve, 9-fourth pipeline, 10-second switching stop valve, 11-flue, 12-oil fume fan, 13-oil fume purifier, 14-oil outlet, 15-oil-water collector, 21-circulating water pipeline, 22-circulating pump, 23-fin tube heat exchanger, 24-circulating water main stop valve, 31-heat pump refrigerant pipeline, 32-evaporator, 33-drying filter, 34-heat pump compressor, 35-condenser, 36-heat pump throttle valve, 37-gas-liquid separator, 40-hot water outlet pipe, 41-tap water pipe, 42-tap water pump, 43-tap water main flow regulating valve, 44-hot water tank, 45-hot water pump, 46-hot water flow regulating valve, 47-user side thermometer, 48-tap water side flow meter, 49-tap water side thermometer, 50-electric heater, 51-air conditioning refrigerant pipeline, 52-indoor unit, 53-air conditioning throttle valve, 54-outdoor unit, 55-four-way reversing valve, 56-air conditioning compressor, 57-heat exchanger, 58-conical end cover, 59-heat transfer fins, 60-heat exchange box. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-4 As shown, this embodiment is a green and energy-saving oil fume waste heat recovery system, including an oil fume system, a circulating water system, a heat pump system and a tap water system; the circulating water system is used to recover the waste heat of high-temperature oil fume in the oil fume system, and the heat pump system is used to absorb the heat of circulating water in the circulating water system and heat the tap water in the tap water system;

[0037] The specific structure of each system is as follows:

[0038] The oil fume system includes a flue 11, one end of the flue 11 is connected to an oil fume fan 12, and the other end of the flue 11 is connected to an oil fume purifier 13;

[0039] The circulating water system includes a circulating water pipeline 21, a circulating pump 22, a first heat exchange box 1 and a fin tube heat exchanger 23. The circulating pump 22, the first heat exchange box 1 and the fin tube heat exchanger 23 are connected in sequence through the circulating water pipeline 21 to form a closed-loop circulation loop; the fin tube heat exchanger 23 is arranged in the flue 11 between the oil fume fan 12 and the oil fume purifier 13; a circulating water main stop valve 24 is arranged on the circulating water pipeline 21 between the circulating pump 22 and the first heat exchange box 1; a funnel-shaped structure is arranged at the bottom of the flue 11 corresponding to the fin tube heat exchanger 23, an oil discharge port 14 is arranged at the bottom of the funnel-shaped structure, and an oil-water collector 15 is arranged at the oil discharge port 14; the oil fume and the fin tube heat exchanger 23 exchange heat and cool. After cooling down, a large amount of oil and water are condensed, and the oil and water are discharged into the oil-water collector 15 through the oil discharge port 14. After cooling down, the oil fume passes through the oil fume purifier 13, instead of the high-temperature oil fume directly entering the oil fume purifier 13, which can reduce the burden of the oil fume purifier 13; while reducing the working pressure of the rear-end oil fume purifier 13, the pollution to the ambient air is effectively reduced; the flow direction of the oil fume in the flue 11 is opposite to the flow direction of the circulating water in the fin-tube heat exchanger 23; the low-temperature circulating water in the fin-tube heat exchanger 23 first contacts with the low-temperature oil fume, and then the circulating water in the fin-tube heat exchanger 23 is gradually heated, and the temperature of the circulating water gradually increases, reducing the heat loss of the circulating water when it flows;

[0040] The heat pump system includes a heat pump refrigerant pipeline 31, an evaporator 32, a heat pump compressor 34, a condenser 35, a heat pump throttle valve 36, a gas-liquid separator 37 and the refrigerant in the heat pump refrigerant pipeline 31; the evaporator 32, the heat pump compressor 34, the condenser 35, the heat pump throttle valve 36 and the gas-liquid separator 37 are sequentially connected through the heat pump refrigerant pipeline 31 to form a closed-loop circulation circuit; the evaporator 32 is arranged inside the first heat exchange box 1; the heat pump system also includes a drying filter 33, which is arranged on the heat pump refrigerant pipeline 31 between the evaporator 32 and the heat pump compressor 34. The refrigerant gas coming out of the evaporator 32 contains some liquid. If this part of the liquid directly enters the heat pump compressor 34, the heat pump compressor 34 will be damaged. Therefore, a drying filter 33 needs to be arranged between the evaporator 32 and the heat pump compressor 34 to remove some of the liquid contained in the refrigerant gas;

[0041] The tap water system includes a tap water pipeline 41, a tap water pump 42, a tap water main flow regulating valve 43, a second heat exchange box 2, a hot water tank 44, a hot water pump 45, a hot water flow regulating valve 46 and a hot water outlet pipe 40 which are connected in sequence; the condenser 35 of the heat pump system is arranged inside the second heat exchange box 2; tap water side thermometers 49 are respectively arranged at the inlet end of the second heat exchange box 2 and the inlet end of the hot water tank 44, which are used to monitor the tap water temperature at the corresponding position; a tap water side flow meter 48 is also arranged at the inlet end of the second heat exchange box 2, which is used to monitor the flow of tap water entering the second heat exchange box 2; a user side thermometer 47 is arranged on the hot water outlet pipe 40, which is used to monitor the outlet water temperature of the hot water; an electric heater 50 is arranged in the hot water tank 44, which is used as an emergency auxiliary heat source;

[0042] The present embodiment further includes an air conditioning system and a switching piping system, wherein the air conditioning system includes an air conditioning refrigerant pipeline 51, an indoor unit 52, an air conditioning throttle valve 53, an outdoor unit 54, a four-way reversing valve 55, an air conditioning compressor 56, and a refrigerant in the air conditioning refrigerant pipeline 51, and the indoor unit 52, the air conditioning throttle valve 53, the outdoor unit 54, the four-way reversing valve 55, and the air conditioning compressor 56 are sequentially connected through the air conditioning refrigerant pipeline 51 to form a closed-loop circulation circuit;

[0043] The heat exchanger 57 of the outdoor unit 54 of the air-conditioning system is connected to the circulating water system and the tap water system through a switching pipe system. The heat exchanger 57 of the outdoor unit 54 of the air-conditioning system exchanges heat with the circulating water in the circulating water system or with the tap water in the tap water system; the heat exchanger 57 exchanges heat with the circulating water or the heat exchanger 57 exchanges heat with the tap water through the switching pipe system; in winter, the heat exchanger 57 exchanges heat with the circulating water, and in summer, the heat exchanger 57 exchanges heat with the tap water through the switching pipe system; after returning to winter again, the heat exchanger 57 exchanges heat with the circulating water through the switching pipe system.

[0044] In this embodiment, the outdoor unit 54 of the air-conditioning system has a heat exchange box 60, and the heat exchanger 57 of the outdoor unit 54 is arranged inside the heat exchange box 60; the heat exchange box 60 is connected in series to the circulating water system, in series to the tap water system, or in parallel to the tap water system by switching the pipeline system; it is convenient to switch the circulating water or tap water to exchange heat with the heat exchanger 57 by switching the pipeline system.

[0045] In this embodiment, the switching pipeline system includes a first pipeline 3, a circulating water auxiliary stop valve 4, a second pipeline 5, a tap water auxiliary flow regulating valve 6, a third pipeline 7, a first switching stop valve 8, a fourth pipeline 9, and a second switching stop valve 10;

[0046] The outlet end of the circulating pump 22 of the circulating water system is connected to the inlet end of the heat exchange box 60 through the first pipe 3, and the circulating water auxiliary stop valve 4 is arranged on the first pipe 3;

[0047] The outlet end of the tap water pump 42 of the tap water system is connected to the inlet end of the heat exchange box 60 through the second pipe 5, and the tap water auxiliary flow regulating valve 6 is arranged on the second pipe 5;

[0048] The outlet end of the heat exchange box 60 is connected to the inlet end of the first heat exchange box 1 of the circulating water system through the third pipe 7, and the first switching stop valve 8 is arranged on the third pipe 7;

[0049] The outlet end of the heat exchange box 60 is connected to the hot water tank 44 of the tap water system through the fourth pipe 9 , and the second switching stop valve 10 is arranged on the fourth pipe 9 .

[0050] In this embodiment, the tap water auxiliary flow regulating valve 6 is an electric flow regulating valve; the switching pipeline system also includes a temperature sensor and a PLC controller, the temperature sensor is arranged at the return air outlet of the indoor unit 52 of the air-conditioning system, the temperature sensor is communicated with the PLC controller, the PLC controller is electrically connected to the electric flow regulating valve, and the PLC controller controls the opening size of the electric flow regulating valve according to the output signal of the temperature sensor; when the air-conditioning system is in cooling operation, the indoor temperature is relatively high at the beginning, so the heat dissipated by the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system is relatively high, and the PLC controller controls the opening size of the electric flow regulating valve according to the output signal of the temperature sensor. The opening of the electric flow regulating valve becomes larger, so that the flow rate of tap water increases, so as to ensure the cooling effect of tap water on the heat exchanger 57. The tap water after heat exchange with the heat exchanger 57 is heated up and becomes domestic hot water and flows into the hot water tank 44 of the tap water system; as the indoor temperature becomes lower, the heat dissipated by the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system becomes lower, and the PLC controller controls the opening of the electric flow regulating valve to become smaller according to the output signal of the temperature sensor, so that the flow rate of tap water decreases; the opening size of the electric flow regulating valve can be controlled according to the change of the indoor temperature. The higher the indoor temperature, the larger the opening of the electric flow regulating valve.

[0051] In this embodiment, the heat exchange box 60 is a cylindrical barrel structure, one end of the heat exchange box 60 is provided with an inlet, and the other end is provided with an outlet. The heat exchanger 57 of the outdoor unit 54 of the air-conditioning system is arranged inside the heat exchange box 60, and the copper tube of the heat exchanger 57 passes through the side wall of the heat exchange box 60 and is welded and sealed to the side wall of the heat exchange box 60; the heat exchanger 57 and the heat exchange box 60 are integrated together to form a modular structure, which is convenient for later maintenance; the copper tube of the heat exchanger 57 located inside the heat exchange box 60 is coiled to form a multi-prism structure, and the axis of the multi-prism structure heat exchanger 57 is aligned with the heat exchange box The axes of the heat exchanger 60 coincide with each other, and a flow channel for the heat exchange fluid is formed between two adjacent prisms on the polyhedral heat exchanger 57; conical end covers 58 are respectively arranged at the axis centers of both ends of the polyhedral heat exchanger 57; the polyhedral heat exchanger 57 is extended along the length direction of the heat exchange box 60, which is consistent with the flow direction of the fluid, so as to facilitate the flow of the fluid; the conical end cover 58 facing the inlet of the heat exchange box 60 is used to guide the fluid entering the interior of the heat exchange box 60, and the conical end cover 58 facing the outlet of the heat exchange box 60 is used to guide the fluid flowing out of the interior of the heat exchange box 60.

[0052] In the present embodiment, a plurality of heat-conducting fins 59 are connected between two adjacent prisms in the polyhedral prism-shaped heat exchanger 57. The plurality of heat-conducting fins 59 are parallel to each other, and the gap between two adjacent heat-conducting fins 59 constitutes a flow channel for the heat exchange fluid; the contact surface between the heat exchanger 57 and the fluid is increased, the heat exchange area of ​​the heat exchanger 57 is increased, the heat exchange efficiency of the heat exchanger 57 is improved, and at the same time, it has a flow-guiding effect on the heat exchange fluid.

[0053] In actual application, a filtering device is detachably connected to the inlet of the heat exchange box 60 to filter the fluid and prevent impurities in the fluid from entering the interior of the heat exchange box 60 .

[0054] A working method of a green and energy-saving oil fume waste heat recovery system based on the above embodiment is as follows:

[0055] When the air conditioning system is working for heating, the switching pipeline system is switched so that the heat exchange box 60 is connected in series to the circulating water system; after the circulating water system is working, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the heat exchange box 60 and the first heat exchange box 1 in sequence, and the heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the circulating water flowing inside the heat exchange box 60, and the heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the circulating water flowing inside the heat exchange box 60, and the heat exchanged by the heat exchanger 57 of the outdoor unit 54 of the air conditioning system is used for indoor heating;

[0056] When the air-conditioning system is in cooling operation, the switching pipeline system is switched so that the heat exchange box 60 is connected in series or in parallel to the tap water system; after the tap water system is working, the tap water in the tap water system flows through the heat exchange box 60, and the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system exchanges heat with the tap water flowing inside the heat exchange box 60, and the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system dissipates heat for indoor cooling, and the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system dissipates heat for heating the tap water, and the heated tap water flows into the hot water tank 44 of the tap water system.

[0057] When the air conditioning system is working for heating in winter, the heat pump system and the tap water system can start or stop working according to the actual situation; if the heat pump system and the tap water system are started, the circulating water in the circulating water system exchanges heat with the heat exchanger 57 inside the heat exchange box 60, and then exchanges heat with the evaporator 32 of the heat pump system inside the first heat exchange box 1; at this time, the heat of the circulating water can be absorbed by the air conditioning system for indoor heating, and can also be absorbed by the heat pump system for heating tap water; if the heat pump system and the tap water system are stopped, the circulating water in the circulating water system only exchanges heat with the heat exchanger 57 inside the heat exchange box 60, and does not exchange heat with the evaporator 32 of the heat pump system inside the first heat exchange box 1; at this time, the heat of the circulating water will only be absorbed by the air conditioning system for indoor heating;

[0058] When the air-conditioning system is working in cooling mode in summer, the circulating water system and the heat pump system can start or stop working according to actual conditions; if the circulating water system and the heat pump system are started, the high-temperature oil smoke in the oil smoke system will exchange heat with the circulating water in the circulating water system, and the circulating water after heat exchange will flow through the first heat exchange box 1; the circulating water in the circulating water system will exchange heat with the evaporator 32 of the heat pump system inside the first heat exchange box 1; at this time, the heat of the circulating water is absorbed by the heat pump system and used to heat the tap water, thereby realizing the synchronous production of domestic hot water with the air-conditioning system; if the circulating water system and the heat pump system stop working, only the air-conditioning system will use the indoor heat to heat and produce domestic hot water.

[0059] The working process and principle of each system in this embodiment are as follows:

[0060] In the oil fume system, the high-temperature oil fume generated in the kitchen enters the flue 11 under the action of the oil fume fan 12, and exchanges heat with the circulating water in the fin-tube heat exchanger 23 when passing through the fin-tube heat exchanger 23 in the flue 11. The high-temperature oil fume transfers heat to the circulating water, and the oil fume after cooling will condense a large amount of oil and water, which is discharged into the oil-water collector 15 through the oil discharge port 14. The oil fume after cooling is treated by the oil fume purifier 13 and discharged into the atmosphere; in this system, the flow direction of the high-temperature oil fume is opposite to the flow direction of the circulating water.

[0061] In the circulating water system, the circulating water exchanges heat with the high-temperature oil smoke in the flue 11 in the fin-tube heat exchanger 23. The low-temperature circulating water absorbs the heat of the high-temperature oil smoke and becomes high-temperature circulating water. The high-temperature circulating water enters the first heat exchange box 1 under the action of the circulating pump 22, and exchanges heat with the evaporator 32 inside the first heat exchange box 1, and transfers the heat to the refrigerant inside the evaporator 32. The cooled low-temperature circulating water leaves the first heat exchange box 1 and enters the fin-tube heat exchanger 23 again to continue to absorb the heat of the high-temperature oil smoke. In the first heat exchange box 1, the flow direction of the circulating water is opposite to the flow direction of the refrigerant in the evaporator 32.

[0062] In a heat pump system, the circulation process of the refrigerant in the heat pump system on the pressure-enthalpy diagram is as follows: Figure 2 As shown in abcda, da represents the change process of the refrigerant in the evaporator 32, ab represents the change process of the refrigerant in the heat pump compressor 34, bc represents the change process of the refrigerant in the condenser 35, and cd represents the change process of the refrigerant in the heat pump throttle valve 36;

[0063] The low-temperature and low-pressure refrigerant liquid (point d state) absorbs the heat transferred from the circulating water in the evaporator 32 and evaporates into a low-temperature and low-pressure refrigerant gas (point a state). The low-temperature and low-pressure refrigerant gas (point a state) is compressed into a high-temperature and high-pressure refrigerant gas (point b state) by the heat pump compressor 34. The high-temperature and high-pressure refrigerant gas (point b state) coming out of the heat pump compressor 34 flows into the condenser 35 and transfers the heat to the low-temperature tap water in the second heat exchange box 2 that flows through the condenser 35. After releasing the heat, the high-temperature and high-pressure refrigerant gas (point b state) condenses into a high-temperature and high-pressure refrigerant liquid (point c state). The high-temperature and high-pressure refrigerant liquid (point c state) is throttled by the heat pump throttle valve 36 and converted into a low-temperature and low-pressure gas-liquid mixture (point d state). The low-temperature and low-pressure gas-liquid mixture (point d state) is separated by the gas-liquid separator 37. The low-temperature and low-pressure refrigerant liquid separated by the gas-liquid separator 37 enters the evaporator 32 again to start the next cycle. In the actual process, the refrigerant gas coming out of the evaporator 32 contains some refrigerant liquid. If this part of the refrigerant liquid directly enters the heat pump compressor 34, it will damage the heat pump compressor 34. Therefore, a drying filter 33 needs to be set between the evaporator 32 and the heat pump compressor 34 to remove the refrigerant liquid.

[0064] When the air conditioning system is working in winter, the refrigerant in the air conditioning system flows as follows: Figure 1 As shown by the hollow small arrow at the air conditioning system in the middle, the circulation process of the refrigerant in the air conditioning system on the pressure-enthalpy diagram is as follows Figure 2As shown in a'-b'-c'-d'-a', d'-a' represents the change process of the refrigerant in the outdoor unit 54, a'-b' represents the change process of the refrigerant in the air-conditioning compressor 56, b'-c' represents the change process of the refrigerant in the indoor unit 52, and c'-d' represents the change process of the refrigerant in the air-conditioning throttle valve 53;

[0065] The low-temperature and low-pressure refrigerant liquid (d' point state) in the outdoor unit 54 absorbs the heat transferred from the circulating water and evaporates into a low-temperature and low-pressure refrigerant gas (a' point state). The low-temperature and low-pressure refrigerant gas (a' point state) is compressed by the air-conditioning compressor 56 into a high-temperature and high-pressure refrigerant gas (b' point state). The high-temperature and high-pressure refrigerant gas (b' point state) coming out of the air-conditioning compressor 56 flows through the indoor unit 52 and transfers the heat to the indoor air flowing through the indoor unit 52. After releasing the heat, the high-temperature and high-pressure refrigerant gas (b' point state) condenses into a high-temperature and high-pressure refrigerant liquid (c' point state). The high-temperature and high-pressure refrigerant liquid (c' point state) coming out of the indoor unit 52 passes through the throttling of the air-conditioning throttle valve 53 and is converted into a low-temperature and low-pressure gas-liquid mixture (d' point state). The low-temperature and low-pressure gas-liquid mixture (d' point state) enters the outdoor unit 54 again to start the next cycle.

[0066] When the air conditioning system is working in the summer, the refrigerant flow direction in the air conditioning system is opposite to that in the winter. Figure 1 As shown by the solid small arrow at the air conditioning system, the circulation process of the refrigerant in the air conditioning system on the pressure-enthalpy diagram is the same as that in winter heating operation, both of which are represented by a'-b'-c'-d'-a', but the difference is that d'-a' represents the change process of the refrigerant in the indoor unit 52, a'-b' represents the change process of the refrigerant in the air conditioning compressor 56, b'-c' represents the change process of the refrigerant in the outdoor unit 54, and c'-d' represents the change process of the refrigerant in the air conditioning throttle valve 53;

[0067] The indoor air flows through the indoor unit 52, transferring heat to the low-temperature and low-pressure refrigerant liquid flowing through the indoor unit 52. After the low-temperature and low-pressure refrigerant liquid absorbs the heat of the indoor air, it evaporates into a low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas enters the air-conditioning compressor 56 and is compressed into a high-temperature and high-pressure refrigerant gas by the air-conditioning compressor 56. The high-temperature and high-pressure refrigerant gas coming out of the air-conditioning compressor 56 flows through the outdoor unit 54, transferring heat to the tap water flowing through the outdoor unit 54. After releasing heat, the high-temperature and high-pressure refrigerant gas condenses into a high-temperature and high-pressure refrigerant liquid. The high-temperature and high-pressure refrigerant liquid coming out of the outdoor unit 54 is throttled by the air-conditioning throttle valve 53 and converted into a low-temperature and low-pressure gas-liquid mixture. The low-temperature and low-pressure gas-liquid mixture enters the indoor unit 52 again to start the next cycle.

[0068] The normal working state of this embodiment is as follows:

[0069] The circulating water secondary stop valve 4, the first switching stop valve 8, the tap water secondary flow regulating valve 6 and the second switching stop valve 10 of the switching pipeline system are closed; the circulating water main stop valve 24 of the circulating water system is opened, and the tap water main flow regulating valve 43 of the tap water system is opened;

[0070] When the air conditioning system does not work and the circulating water system works, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the first heat exchange box 1; the heat pump system and the tap water system start working, the evaporator 32 of the heat pump system exchanges heat with the circulating water flowing through the first heat exchange box 1, absorbs the heat of the circulating water, and the low-temperature tap water flows into the second heat exchange box 2 under the action of the tap water pump 42, exchanges heat with the condenser 35 of the heat pump system inside the second heat exchange box 2, absorbs the heat of the refrigerant in the condenser 35, converts it into high-temperature tap water, and then flows into and is stored in the hot water tank 44, and then is delivered to the user through the user-side hot water pump 45; at this time, the waste heat of oil smoke recovered by the circulating water system will only be absorbed by the heat pump system for heating tap water.

[0071] The first working state of this embodiment in winter is as follows:

[0072] The circulating water auxiliary stop valve 4 and the first switching stop valve 8 of the switching pipeline system are opened, and the tap water auxiliary flow regulating valve 6 and the second switching stop valve 10 are closed; the circulating water main stop valve 24 of the circulating water system is closed, and the tap water main flow regulating valve 43 of the tap water system is opened; at this time, the heat exchange box 60 is connected in series to the circulating water system;

[0073] The air conditioning system is in heating operation. After the circulating water system is in operation, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system. The circulating water after heat exchange flows through the heat exchange box 60 and the first heat exchange box 1 in sequence. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the circulating water flowing through the heat exchange box 60. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the circulating water flowing through the heat exchange box 60. The heat exchanged by the heat exchanger 57 of the outdoor unit 54 of the air conditioning system is used to heat the room. At the same time, the heat pump system and the tap water system start to work. The evaporator 32 of the heat pump system exchanges heat with the circulating water flowing through the first heat exchange box 1. The circulating water undergoes heat exchange, absorbing the heat of the circulating water. The low-temperature tap water flows into the second heat exchange box 2 under the action of the tap water pump 42, exchanges heat with the condenser 35 of the heat pump system inside the second heat exchange box 2, absorbs the heat of the refrigerant in the condenser 35, and is converted into high-temperature tap water. The high-temperature tap water then flows into and is stored in the hot water tank 44, and is then delivered to the user through the user-side hot water pump 45. At this time, the waste heat of the oil smoke recovered by the circulating water system can be absorbed by the air-conditioning system for indoor heating, and can also be absorbed by the heat pump system for heating tap water.

[0074] The second working state of this embodiment in winter is as follows:

[0075] The circulating water auxiliary stop valve 4 and the first switching stop valve 8 of the switching pipeline system are opened, and the tap water auxiliary flow regulating valve 6 and the second switching stop valve 10 are closed; the circulating water main stop valve 24 of the circulating water system is closed, and the tap water main flow regulating valve 43 of the tap water system is closed; at this time, the heat exchange box 60 is connected in series to the circulating water system;

[0076] The air-conditioning system is in heating operation. After the circulating water system is in operation, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the heat exchange box 60 and the first heat exchange box 1 in turn; the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system exchanges heat with the circulating water flowing through the inside of the heat exchange box 60, and the heat exchanger 57 of the outdoor unit 54 of the air-conditioning system exchanges heat for indoor heating; at the same time, the heat pump system and the tap water system stop working; at this time, the waste heat of the oil smoke recovered by the circulating water system will only be absorbed by the air-conditioning system for indoor heating.

[0077] The first working state of this embodiment in summer is as follows:

[0078] The circulating water secondary stop valve 4 and the first switching stop valve 8 of the switching pipeline system are closed, and the tap water secondary flow regulating valve 6 and the second switching stop valve 10 are opened; the tap water main flow regulating valve 43 of the tap water system is closed; at this time, the heat exchange box 60 is connected in series to the tap water system;

[0079] The air conditioning system is in cooling operation, and the tap water system starts to work. The low-temperature tap water flows into the heat exchange box 60 under the action of the tap water pump 42. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the low-temperature tap water flowing through the inside of the heat exchange box 60. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system dissipates heat for indoor cooling. The low-temperature tap water absorbs the heat dissipated by the heat exchanger 57 of the outdoor unit 54 of the air conditioning system, and the low-temperature tap water is heated and converted into tap water with a certain temperature. The heated tap water flows into the hot water tank 44 of the tap water system, and then is delivered to the user through the user-side hot water pump 45. While cooling the indoor temperature, more domestic hot water is produced to meet the user's demand for domestic hot water. At the same time, the circulating water system and the heat pump system stop working.

[0080] The second working state of this embodiment in summer is as follows:

[0081] The circulating water auxiliary stop valve 4 and the first switching stop valve 8 of the switching pipeline system are closed, and the tap water auxiliary flow regulating valve 6 and the second switching stop valve 10 are opened; the tap water main flow regulating valve 43 of the tap water system is opened; at this time, the heat exchange box 60 is connected in parallel to the tap water system;

[0082] The air conditioning system is in cooling operation, the tap water system starts to operate, and the low-temperature tap water flows into the heat exchange box 60 under the action of the tap water pump 42. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system exchanges heat with the low-temperature tap water flowing through the inside of the heat exchange box 60. The heat exchanger 57 of the outdoor unit 54 of the air conditioning system emits heat for indoor cooling. The low-temperature tap water absorbs the heat emitted by the heat exchanger 57 of the outdoor unit 54 of the air conditioning system, and the low-temperature tap water is heated and converted into tap water with a certain temperature. The heated tap water flows into the hot water tank 44 of the tap water system, and then is delivered to the user through the user-side hot water pump 45. This realizes the indoor cooling while producing more domestic hot water to meet the user's demand for domestic hot water.

[0083] At the same time, the circulating water system and the heat pump system start working, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the first heat exchange box 1, and the evaporator 32 of the heat pump system exchanges heat with the circulating water flowing through the first heat exchange box 1, absorbing the heat of the circulating water, and the low-temperature tap water flows into the second heat exchange box 2 under the action of the tap water pump 42, and exchanges heat with the condenser 35 of the heat pump system inside the second heat exchange box 2, absorbs the heat of the refrigerant in the condenser 35, and converts it into high-temperature tap water, and then flows into and is stored in the hot water tank 44 of the tap water system, and then is delivered to the user through the user-side hot water pump 45; at this time, the waste heat of oil smoke recovered by the circulating water system is absorbed by the heat pump system for heating tap water.

[0084] The beneficial effects of the present invention include:

[0085] (1) The present invention sets a circulating water system between the heat pump system and the oil fume system so that the heat pump system does not come into direct contact with the oil fume, thereby ensuring efficient heat exchange and effectively preventing the oil fume from directly participating in the operation of the heat pump system. The oil fume will not corrode the heat pump system, and the heat pump system will not be affected by dirty oil fume while efficiently recovering the waste heat of the oil fume. The heat pump system plus the circulating water system are used to recover the waste heat of the oil fume and use it for heating to produce domestic hot water, thereby ensuring the stable operation of the heat pump system and reducing the impact of dirty oil fume on the heat pump system.

[0086] (2) The present invention incorporates an air conditioning system to achieve indoor heating using waste heat from cooking fumes in winter and indoor heating to produce domestic hot water in summer, thereby achieving indoor cooling while producing more domestic hot water to meet users' demand for domestic hot water.

[0087] Terminology explanation:

[0088] Evaporator: The refrigerant in the evaporator is a low-temperature, low-pressure liquid. When the circulating water flows through the evaporator, the circulating water transfers heat to the refrigerant in the evaporator, and the refrigerant evaporates and converts into a low-temperature, low-pressure gas.

[0089] Compressor: The compressor can compress the refrigerant from low-temperature and low-pressure gas into high-temperature and high-pressure gas.

[0090] Condenser: The high-temperature and high-pressure refrigerant gas in the condenser transfers heat to the tap water flowing through the condenser, and the refrigerant condenses and turns into a high-temperature and high-pressure liquid.

[0091] Throttle valve: The throttle valve converts the high-temperature and high-pressure refrigerant liquid into a low-temperature and low-pressure gas-liquid mixture.

[0092] Gas-liquid separator: removes gas from the gas-liquid mixed refrigerant.

[0093] Dry filter: removes liquid from refrigerant gas.

[0094] Oil fume purifier: used to treat oil fume exhaust gas.

[0095] Evaporation temperature: the temperature at which the refrigerant boils in the evaporator. The evaporation temperature corresponds to the evaporation pressure. The higher the evaporation temperature, the higher the evaporation pressure.

[0096] Evaporation Pressure: The maximum pressure at which a refrigerant changes from liquid to gas.

[0097] Condensation temperature: The temperature of the refrigerant in the condenser when it condenses from gas to liquid; the condensation temperature corresponds to the condensation pressure. The higher the condensation temperature, the higher the condensation pressure.

[0098] Condensation pressure: the maximum pressure at which the refrigerant condenses from gas to liquid.

[0099] Pressure-enthalpy diagram: used to analyze the refrigerant state change process. The horizontal axis is the specific enthalpy value (indicates the size of the refrigerant enthalpy value. The larger the horizontal axis value, the larger the refrigerant enthalpy value), and the vertical axis is the logarithm of the absolute pressure (indicates the high and low refrigerant pressure. The larger the vertical axis value, the higher the refrigerant pressure).

[0100] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; in addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0101] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected", "connected" and "set" should be understood in a broad sense. For example, it can be a fixed connection or setting, or a detachable connection or setting, or an integral connection or setting; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the above embodiments do not limit the present invention in any form, and all technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A green and energy-saving oil fume waste heat recovery system, comprising an oil fume system, a circulating water system, a heat pump system and a tap water system; the circulating water system is used to recover the waste heat of high-temperature oil fume in the oil fume system, and the heat pump system is used to absorb the heat of circulating water in the circulating water system and heat the tap water in the tap water system; the characteristics are: It also includes an air conditioning system and a switching pipeline system, wherein the heat exchanger of the outdoor unit of the air conditioning system is connected with the circulating water system and the tap water system through the switching pipeline system, and the heat exchanger of the outdoor unit of the air conditioning system exchanges heat with the circulating water in the circulating water system or exchanges heat with the tap water in the tap water system; the heat exchange between the heat exchanger and the circulating water or the heat exchange between the heat exchanger and the tap water is switched through the switching pipeline system; The outdoor unit of the air conditioning system has a heat exchange box, and the heat exchanger of the outdoor unit is arranged inside the heat exchange box; the heat exchange box is connected in series to the circulating water system, in series to the tap water system, or in parallel to the tap water system by switching the pipe system; The switching pipeline system includes a first pipeline, a circulating water auxiliary stop valve, a second pipeline, a tap water auxiliary flow regulating valve, a third pipeline, a first switching stop valve, a fourth pipeline, and a second switching stop valve; The outlet end of the circulating pump of the circulating water system is connected to the inlet end of the heat exchange box through the first pipeline, and the circulating water auxiliary stop valve is arranged on the first pipeline; The outlet end of the tap water pump of the tap water system is connected to the inlet end of the heat exchange box through a second pipeline, and the tap water auxiliary flow regulating valve is arranged on the second pipeline; The outlet end of the heat exchange box is connected to the inlet end of the first heat exchange box of the circulating water system through a third pipeline, and the first switching stop valve is arranged on the third pipeline; The outlet end of the heat exchange box is connected to the hot water tank of the tap water system through a fourth pipe, and the second switching stop valve is arranged on the fourth pipe; The heat exchange box is a cylindrical barrel structure, one end of the heat exchange box is provided with an inlet, and the other end is provided with an outlet, the heat exchanger of the outdoor unit of the air-conditioning system is arranged inside the heat exchange box, the copper tube of the heat exchanger passes through the side wall of the heat exchange box and is welded and sealed to the side wall of the heat exchange box; the copper tube of the heat exchanger located inside the heat exchange box is coiled to form a multi-prism structure, the axis of the multi-prism heat exchanger coincides with the axis of the heat exchange box, and a flow channel for the heat exchange fluid is formed between two adjacent prisms on the multi-prism heat exchanger; conical end covers are respectively provided at the axis centers of both ends of the multi-prism heat exchanger; a plurality of heat-conducting fins are connected between two adjacent prisms in the multi-prism heat exchanger, the plurality of heat-conducting fins are parallel to each other, and the gap between two adjacent heat-conducting fins forms a flow channel for the heat exchange fluid; The following working methods are also included: When the air conditioning system is working for heating, the switching pipeline system is switched so that the heat exchange box is connected in series to the circulating water system; after the circulating water system is working, the high-temperature oil smoke in the oil smoke system exchanges heat with the circulating water in the circulating water system, and the circulating water after heat exchange flows through the heat exchange box and the first heat exchange box in sequence, and the heat exchanger of the outdoor unit of the air conditioning system exchanges heat with the circulating water flowing inside the heat exchange box, and the heat exchanged by the heat exchanger of the outdoor unit of the air conditioning system is used for indoor heating; When the air-conditioning system is in cooling operation, the switching pipeline system is switched to connect the heat exchange box in series or in parallel with the tap water system; after the tap water system is working, the tap water in the tap water system flows through the heat exchange box, and the heat exchanger of the outdoor unit of the air-conditioning system exchanges heat with the tap water flowing through the inside of the heat exchange box, the heat exchanger of the outdoor unit of the air-conditioning system dissipates heat for indoor cooling, and the heat exchanger of the outdoor unit of the air-conditioning system dissipates heat for heating the tap water, and the heated tap water flows into the hot water tank of the tap water system.

2. The green and energy-saving oil fume waste heat recovery system according to claim 1 is characterized in that: The tap water auxiliary flow regulating valve is an electric flow regulating valve; The switching pipeline system also includes a temperature sensor and a PLC controller. The temperature sensor is arranged at the return air outlet of the indoor unit of the air-conditioning system. The temperature sensor is communicatively connected to the PLC controller. The PLC controller is electrically connected to the electric flow regulating valve. The PLC controller controls the opening size of the electric flow regulating valve according to the output signal of the temperature sensor.

3. The green and energy-saving oil fume waste heat recovery system according to claim 1 is characterized in that: A filtering device is detachably connected to the inlet of the heat exchange box.

4. The green and energy-saving oil fume waste heat recovery system according to claim 1 is characterized in that: When the air conditioning system is working for heating, the heat pump system and the tap water system start working or stop working; when the air conditioning system is working for cooling, the circulating water system and the heat pump system start working or stop working.

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