A green and energy-saving oil fume waste heat recovery system combined with solar energy

Abstract

The present invention discloses a green and energy-saving oil fume waste heat recovery system combined with solar energy, comprising an oil fume system, a circulating water system, a heat pump system, a tap water system and a solar energy system; the present invention realizes efficient recovery of waste heat in oil fume, while ensuring the smooth operation of the waste heat recovery system, reducing the impact of dirty oil fume on the waste heat recovery system, and adopts a heat pump system plus a circulating water system to convert the heat in the oil fume into domestic water. In order to meet the user's heat demand for domestic water, a solar energy system is also added as an auxiliary heat source.

Description

Technical Field

[0001] The invention relates to a green energy-saving oil fume waste heat recovery system combined with solar energy, belonging to the technical field of oil 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 exhaust, 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] After searching, reference 1: Chen Guansheng, Shi Baoxin, Wu Guiyan, et al. Experimental study on kitchen waste heat recovery heat pump [J]. Journal of Guangdong University of Technology, 2006, 23(1):4; proposed a method of using a heat pump system to recover the exhaust waste heat of kitchen fumes. Based on the research, a heat pump device that can recover kitchen waste heat to produce sanitary hot water was developed, and a prototype test was carried out. The results showed that the device has a good heating effect and an efficiency of up to 400% to 500%, which has a good promotion value; the system schematic diagram is shown in the attached Figure 5 As shown; the oil smoke generated in the kitchen enters the oil filter under the action of the range hood, and the oil smoke treated by the oil filter directly enters the evaporator, transfers the heat to the heat pump system, and then transfers the heat to the hot water through the heat pump system.

[0004] Reference 2: Zhou Changming, Chen Dong, Xie Jihong, et al. Typical scheme and application characteristics of oil fume waste heat recovery device [J]. Chemical Equipment Technology, 2016, 37(6):3; A water forced circulation oil fume waste heat recovery device was proposed, and its schematic diagram is shown in the attached figure. Figure 6 As shown; when the range hood starts working, the oil fume exhaust gas passes through the fin-tube heat exchanger in the flue, transfers heat to the water in the fin-tube heat exchanger tube, the oil fume is cooled by absorbing heat, the oil vapor and water vapor in the oil fume are condensed into an oil-water mixture, and flows out through the oil discharge port below the flue for collection; the water in the fin-tube heat exchanger tube is heated by the oil fume, and driven into the hot water tank by the circulating pump, and the cycle continues in this way, the temperature of the water in the hot water tank continues to rise, so as to obtain hot water required for kitchen cleaning, etc.

[0005] The disadvantages of the prior art are as follows:

[0006] Regarding reference 1: Oil smoke directly enters the evaporator. Even if the oil smoke has been processed in the oil filter, it still contains a large amount of complex organic matter, fuel combustion particles and other harmful substances. Directly entering the heat pump system 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 cause its heat exchange efficiency to decrease, thereby affecting the heat exchange effect of the entire device;

[0007] Regarding reference 2: This method has low heat exchange efficiency, the exhaust fume temperature is high, and it cannot effectively recover the waste heat in the fume;

[0008] The heat of the waste heat from the oil fumes exchanged by the first two references is not equal to the heat required for domestic water, and an auxiliary heat source needs to be set up, but the first two references do not consider the auxiliary heat source; at the same time, the traditional heat exchange component structure and heat exchange method have encountered bottlenecks, resulting in the inability to significantly improve the heat exchange efficiency. Summary of the invention

[0009] In order to solve the above technical problems, efficiently recover the waste heat in the oil fume, ensure the smooth operation of the waste heat recovery system, and reduce the impact of dirty oil fume on the waste heat recovery system, the present invention provides a green and energy-saving oil fume waste heat recovery system combined with solar energy, which converts the heat in the oil fume into domestic water by means of a heat pump system plus a circulating water system. In order to meet the user's heat demand for domestic water, a solar energy system is also added as an auxiliary heat source.

[0010] In order to achieve the above object, the present invention adopts the following technical solution:

[0011] A green energy-saving oil fume waste heat recovery system combined with solar energy, comprising an oil fume system, a circulating water system, a heat pump system, a tap water system and a solar energy system;

[0012] The oil fume system comprises a flue, one end of which is connected to the oil fume fan, and the other end of which is connected to the oil fume purifier;

[0013] The circulating water system comprises a circulating water pipeline, a circulating pump, a fin-tube heat exchanger and a first heat exchange box, wherein the circulating pump, the fin-tube heat exchanger and the first heat exchange box are sequentially connected through the circulating water pipeline to form a closed-loop circulation loop; the fin-tube heat exchanger is arranged in the flue between the oil fume fan and the oil fume purifier;

[0014] The heat pump system comprises a refrigerant pipeline, an evaporator, a compressor, a condenser, a throttle valve, a gas-liquid separator and a refrigerant in the refrigerant pipeline; the evaporator, the compressor, the condenser, the throttle valve and the gas-liquid separator are sequentially connected through the refrigerant pipeline to form a closed-loop circulation circuit; the evaporator is arranged inside the first heat exchange box;

[0015] The tap water system includes a tap water pipeline, a tap water pump, a tap water flow regulating valve, a second heat exchange tank, a hot water tank, a hot water pump, a hot water flow regulating valve and a hot water outlet pipeline which are connected in sequence; the condenser of the heat pump system is arranged inside the second heat exchange tank;

[0016] The solar energy system comprises a solar water heating pipe, a solar water pump and a solar thermal collector; the solar water pump and the solar thermal collector are connected in sequence with the hot water tank of the tap water system through the solar water heating pipe to form a closed-loop circulation circuit.

[0017] As a further preference of the present invention, a funnel-shaped structure is arranged at the bottom of the flue corresponding to the fin-tube heat exchanger, an oil discharge port is arranged at the bottom of the funnel-shaped structure, and an oil-water collector is arranged at the oil discharge port; a large amount of oil and water are condensed after the oil fume exchanges heat with the fin-tube heat exchanger and cools down, and the oil and water are discharged into the oil-water collector through the oil discharge port, and the oil fume passes through the oil fume purifier after cooling down, instead of the high-temperature oil fume directly entering the oil fume purifier, which can reduce the burden of the oil fume purifier; while reducing the working pressure of the rear-end oil fume purifier, the pollution to the ambient air is effectively reduced.

[0018] As a further preference of the present invention, a partition plate is arranged inside the funnel-shaped structure, and a plurality of leakage holes are arranged in an array on the partition plate; a plurality of first guide plates and a plurality of second guide plates are arranged between the partition plate and the top of the flue, the top edge and the bottom edge of the first guide plate are connected to the top of the flue and the partition plate respectively, the rear edge of the first guide plate is connected to the rear wall of the flue, and a gap is provided between the front edge of the first guide plate and the front wall of the flue; the top edge and the bottom edge of the second guide plate are connected to the top of the flue and the partition plate respectively, the front edge of the second guide plate is connected to the front wall of the flue, and the rear edge of the second guide plate is connected to the flue There is a gap between the rear side walls of the flue; the multiple first guide plates and the multiple second guide plates are alternately arranged at equal intervals along the length direction of the flue to form a serpentine oil fume flow channel; the fin-tube heat exchanger is a serpentine structure that matches the serpentine oil fume flow channel and is arranged in the serpentine oil fume flow channel; it is used to increase the flow path length of the oil fume when it flows in the flue, effectively increase the contact time between the fin-tube heat exchanger and the oil fume, improve the heat exchange efficiency and heat exchange effect between the fin-tube heat exchanger and the oil fume, effectively reduce the temperature of the oil fume when it is discharged, and reduce environmental pollution; after the oil fume exchanges heat with the fin-tube heat exchanger and cools down, a large amount of oil and water condenses and drips downward through the leakage hole.

[0019] As a further preferred embodiment of the present invention, the fins on the fin-tube heat exchanger are of an angle plate structure, and the angle plate structure fins have a plurality of holes arranged in an irregular array; compared with traditional flat plate structure fins, the angle plate structure fins can reduce the lateral occupied space, increase the heat exchange area, and thus increase the contact area with the oil fume, thereby improving the heat exchange effect; and the angle plate structure fins are provided with a plurality of holes arranged in an irregular array, which can disturb the flowing oil fume, thereby further improving the heat exchange effect.

[0020] As a further preference of the present invention, the flow direction of the oil fume in the serpentine oil fume flow channel is opposite to the flow direction of the circulating water in the fin-tube heat exchanger; the low-temperature circulating water in the fin-tube heat exchanger first contacts with the low-temperature oil fume, and then the circulating water in the fin-tube heat exchanger is gradually heated, and the temperature of the circulating water gradually increases, thereby reducing the heat loss of the circulating water during flow.

[0021] As a further preferred embodiment of the present invention, the first heat exchange box is a hollow cylindrical structure, and water inlet pipes are respectively arranged on the outer circumferential surfaces of both sides of the first heat exchange box, and the two water inlet pipes are not arranged directly opposite to each other, and the water inlet pipes are rectangular tubes extending along the length direction of the first heat exchange box with a hollow cylindrical structure; the evaporator is a tubular structure, and the tubular structure evaporator is coaxially arranged with the first heat exchange box with a hollow cylindrical structure; a water outlet pipe is arranged inside the first heat exchange box, and the water outlet pipe is extended along the axis of the first heat exchange box, and the outlet end of the water outlet pipe extends to the outside of the first heat exchange box, and a plurality of water outlet holes are arranged on the water outlet pipe body located inside the first heat exchange box; the circulating water enters the first heat exchange box through the two water inlet pipes, and since the water inlet pipes are rectangular tubes, the circulating water is flat Enter the first heat exchange box; since the two water inlet pipes are not arranged directly opposite to each other, the two circulating waters entering the first heat exchange box flow circumferentially inside the first heat exchange box, and under the negative pressure suction of the outlet pipe, the circulating water flowing circumferentially flows in a vortex shape toward the outlet pipe, and the circulating water flowing in a vortex shape flows through the tubular structure evaporator and then enters the outlet pipe, and is finally led out by the outlet pipe; the circulating water exchanges heat with the refrigerant inside the tubular structure evaporator when flowing through the tubular structure evaporator, and the circulating water transfers heat to the refrigerant; the structural design of the hollow cylindrical first heat exchange box and the tubular structure evaporator, as well as the flow direction design of the circulating water, can effectively improve the contact effect and heat exchange effect between the circulating water and the evaporator, thereby improving the heat exchange efficiency.

[0022] As a further preferred embodiment of the present invention, two tubular structure evaporators are arranged inside the first heat exchange box, the diameters of the two tubular structure evaporators are different, and the two tubular structure evaporators are coaxially arranged; the evaporation fins on the two tubular structure evaporators are angle plate structures, and the angle plate structure evaporation fins on the two tubular structure evaporators are arranged in an interlaced manner, and the tips of the angle plate structure evaporation fins on the two tubular structure evaporators are facing in opposite directions; the structural design of the two coaxially arranged tubular structure evaporators can increase the heat exchange area of ​​the evaporator, improve the contact area between the circulating water and the evaporator, and the heat exchange effect; the angle plate structure evaporation fins can also reduce the lateral occupied space, increase the heat exchange area, and have a guiding effect on the circulating water flowing through the tubular structure evaporator; the angle plate structure evaporation fins on the two tubular structure evaporators that are arranged in an interlaced manner can avoid mutual influence and reduce the distance between the two tubular structure evaporators; the tips of the angle plate structure evaporation fins on the two tubular structure evaporators are facing in opposite directions, which can change the flow direction of the circulating water in the process of flowing through the two tubular structure evaporators, thereby further improving the heat exchange efficiency and heat exchange effect between the circulating water and the evaporator.

[0023] As a further preferred embodiment of the present invention, the heat pump system also includes a drying filter, which is arranged on the refrigerant pipeline between the evaporator and the compressor; the refrigerant gas coming out of the evaporator contains some liquid, and if this part of liquid directly enters the compressor, it will damage the compressor, so it is necessary to set a drying filter between the evaporator and the compressor to remove some of the liquid contained in the refrigerant gas.

[0024] As a further preferred embodiment of the present invention, a tap water side thermometer is respectively provided at the inlet and outlet of the second heat exchange box to monitor the tap water temperature at the inlet and outlet of the second heat exchange box; a tap water side flow meter is also provided at the inlet of the second heat exchange box to monitor the flow of tap water;

[0025] A solar side thermometer is respectively arranged at the inlet and outlet of the solar collector to monitor the hot water temperature at the inlet and outlet of the solar collector; a solar side flow regulating valve and a solar side flow meter are also arranged at the outlet of the solar collector to adjust and monitor the flow of hot water in the solar hot water pipeline;

[0026] A user-side thermometer is arranged on the hot water outlet pipe to monitor the outlet temperature of the hot water.

[0027] As a further preferred embodiment of the present invention, an electric heater is provided in the hot water tank to be used as an auxiliary heat source in case there is insufficient sunlight or insufficient heat from cooking fumes in winter.

[0028] The present invention is beneficial in that:

[0029] Firstly, 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 avoiding 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.

[0030] Secondly, the present invention adds a solar energy system as an auxiliary heat source, which is a renewable energy source. It can use solar energy and waste heat from cooking fumes to heat domestic water, which can better meet the user's heat demand for domestic water.

[0031] Ultimately, the present invention achieves efficient recovery of waste heat in oil smoke, while ensuring the smooth operation of the waste heat recovery system, reducing the impact of dirty oil smoke on the waste heat recovery system, and converting the heat in the oil smoke into domestic water by means of a heat pump system plus a circulating water system. In order to meet users' heat needs for domestic water, a solar energy system is also added as an auxiliary heat source. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the connection relationship of various components of the present invention;

[0033] Figure 2 It is a pressure-enthalpy diagram of the refrigerant cycle process of the heat pump system of the present invention;

[0034] Figure 3 It is a schematic diagram of the top view of the structure of the flue of the present invention after removing the top;

[0035] Figure 4 It is a schematic diagram of the structure inside the first heat exchange box of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of reference 1;

[0037] Figure 6 It is a schematic diagram of the structure of reference 2;

[0038] Meaning of the reference numerals in the figures:

[0039] 1-first heat exchange box, 2-second heat exchange box, 3-interlayer plate, 4-leakage hole, 5-first guide plate, 6-second guide plate, 7-water inlet pipe, 8-water outlet pipe, 9-water outlet, 10-electric heater, 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-fin, 31-refrigerant pipeline, 32-evaporator, 33-drying filter, 34-compressor, 35-condenser, 36- Throttle valve, 37-gas-liquid separator, 38-evaporating fins, 41-tap water pipe, 42-tap water pump, 43-tap water flow regulating valve, 44-hot water tank, 45-hot water flow regulating valve, 46-hot water pump, 47-user side thermometer, 48-tap water side flow meter, 49-tap water side thermometer, 50-hot water outlet pipe, 51-solar hot water pipe, 52-solar water pump, 53-solar collector, 54-solar side flow regulating valve, 55-solar side thermometer, 56-solar side flow meter. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1-4 As shown, this embodiment is a green energy-saving oil fume waste heat recovery system combined with solar energy, including an oil fume system, a circulating water system, a heat pump system, a tap water system and a solar energy system;

[0042] 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;

[0043] The circulating water system includes a circulating water pipeline 21, a circulating pump 22, a fin-tube heat exchanger 23 and a first heat exchange box 1. The circulating pump 22, the fin-tube heat exchanger 23 and the first heat exchange box 1 are sequentially connected 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;

[0044] The heat pump system includes a refrigerant pipeline 31, an evaporator 32, a compressor 34, a condenser 35, a throttle valve 36, a gas-liquid separator 37, and a refrigerant in the refrigerant pipeline 31; the evaporator 32, the compressor 34, the condenser 35, the throttle valve 36, and the gas-liquid separator 37 are sequentially connected through the refrigerant pipeline 31 to form a closed-loop circulation circuit; the evaporator 32 is arranged inside the first heat exchange box 1;

[0045] The tap water system includes a tap water pipe 41, a tap water pump 42, a tap water flow regulating valve 43, a second heat exchange box 2, a hot water tank 44, a hot water pump 46, a hot water flow regulating valve 45 and a hot water outlet pipe 50 which are connected in sequence; the condenser 35 of the heat pump system is arranged inside the second heat exchange box 2;

[0046] The solar energy system includes a solar water heating pipe 51, a solar water pump 52 and a solar collector 53; the solar water pump 52 and the solar collector 53 are connected in sequence with the hot water tank 44 of the tap water system through the solar water heating pipe 51 to form a closed-loop circulation circuit.

[0047] In this embodiment, 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; a large amount of oil and water are condensed after the oil fume exchanges heat with the fin-tube heat exchanger 23 and cools down, and the oil and water are discharged into the oil-water collector 15 through the oil discharge port 14, and the oil fume passes through the oil fume purifier 13 after cooling down, instead of 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.

[0048] In this embodiment, an interlayer plate 3 is arranged inside the funnel-shaped structure, and a plurality of leakage holes 4 are arranged in an array on the interlayer plate 3; a plurality of first guide plates 5 and a plurality of second guide plates 6 are arranged between the interlayer plate 3 and the top of the flue 11, the top edge and the bottom edge of the first guide plate 5 are connected to the top of the flue 11 and the interlayer plate 3 respectively, the rear edge of the first guide plate 5 is connected to the rear side wall of the flue 11, and a gap is formed between the front edge of the first guide plate 5 and the front side wall of the flue 11; the top edge and the bottom edge of the second guide plate 6 are connected to the top of the flue 11 and the interlayer plate 3 respectively, the front edge of the second guide plate 6 is connected to the front side wall of the flue 11, and the rear edge of the second guide plate 6 is connected to the rear side wall of the flue 11 There are gaps between the side walls; a plurality of first guide plates 5 and a plurality of second guide plates 6 are alternately arranged at equal intervals along the length direction of the flue 11 to form a serpentine oil fume flow channel; the fin-tube heat exchanger 23 is a serpentine structure that matches the serpentine oil fume flow channel and is arranged in the serpentine oil fume flow channel; it is used to increase the flow path length of the oil fume when it flows in the flue 11, effectively increase the contact time between the fin-tube heat exchanger 23 and the oil fume, improve the heat exchange efficiency and heat exchange effect between the fin-tube heat exchanger 23 and the oil fume, effectively reduce the temperature of the oil fume when it is discharged, and reduce environmental pollution; after the oil fume exchanges heat with the fin-tube heat exchanger 23 and cools down, a large amount of oil and water condenses and drips downward through the leakage hole 4.

[0049] In the present embodiment, the fin 24 on the fin-tube heat exchanger 23 is an angle plate structure, and the angle plate structure fin 24 has a plurality of holes arranged in an irregular array; compared with the traditional flat plate structure fin, the angle plate structure fin 24 can reduce the lateral occupied space, increase the heat exchange area, and thus increase the contact area with the oil smoke, thereby improving the heat exchange effect; the tip of the angle plate structure fin 24 can face the direction of the oil smoke or face away from the direction of the oil smoke; a plurality of holes arranged in an irregular array are provided on the angle plate structure fin 24, which can disturb the flowing oil smoke, thereby further improving the heat exchange effect.

[0050] In this embodiment, the flow direction of the oil smoke in the serpentine oil smoke flow channel 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 smoke, and then the circulating water in the fin-tube heat exchanger 23 is gradually heated, and the temperature of the circulating water gradually increases, thereby reducing the heat loss of the circulating water during flow.

[0051] In this embodiment, the first heat exchange box 1 is a hollow cylindrical structure, and water inlet pipes 7 are respectively arranged on the outer circumferential surfaces of both sides of the first heat exchange box 1, and the two water inlet pipes 7 are not arranged directly opposite to each other. The water inlet pipes 7 are rectangular tubes extending along the length direction of the first heat exchange box 1 with a hollow cylindrical structure; the evaporator 32 is a tubular structure, and the tubular structure evaporator 32 is coaxially arranged with the first heat exchange box 1 with a hollow cylindrical structure; a water outlet pipe 8 is arranged inside the first heat exchange box 1, and the water outlet pipe 8 is extended along the axis of the first heat exchange box 1, and the outlet end of the water outlet pipe 8 extends to the outside of the first heat exchange box 1, and a plurality of water outlet holes 9 are arranged on the water outlet pipe 8 inside the first heat exchange box 1; the circulating water enters the first heat exchange box 1 through the two water inlet pipes 7. Since the water inlet pipe 7 is a rectangular tube, the circulating water enters the first heat exchange box 1 in a flat shape. Box 1; since the two water inlet pipes 7 are not arranged opposite to each other, the two circulating waters entering the first heat exchange box 1 flow circumferentially inside the first heat exchange box 1, and under the negative pressure suction action of the water outlet pipe 8, the circulating water flowing circumferentially flows in a vortex shape toward the water outlet pipe 8, and the circulating water flowing in a vortex shape flows through the tubular structure evaporator 32 and then enters the water outlet pipe 8, and is finally led out by the water outlet pipe 8; when flowing through the tubular structure evaporator 32, the circulating water exchanges heat with the refrigerant inside the tubular structure evaporator 32, and the circulating water transfers heat to the refrigerant; the structural design of the hollow cylindrical structure first heat exchange box 1 and the tubular structure evaporator 32, as well as the flow direction design of the circulating water, can effectively improve the contact effect and heat exchange effect between the circulating water and the evaporator 32, thereby improving the heat exchange efficiency.

[0052] In this embodiment, two tubular structure evaporators 32 are arranged inside the first heat exchange box 1. The diameters of the two tubular structure evaporators 32 are different, and the two tubular structure evaporators 32 are coaxially arranged; the evaporation fins 38 on the two tubular structure evaporators 32 are angle plate structures, and the angle plate structure evaporation fins 38 on the two tubular structure evaporators 32 are arranged alternately, and the tips of the angle plate structure evaporation fins 38 on the two tubular structure evaporators 32 face oppositely; the structural design of the two coaxially arranged tubular structure evaporators 32 can increase the heat exchange area of ​​the evaporator 32, improve the contact area between the circulating water and the evaporator 32, and increase the heat exchange area. Thermal effect; the angle plate structure evaporation fins 38 can also reduce the horizontal occupied space, increase the heat exchange area, and have a guiding effect on the circulating water flowing through the tubular structure evaporator 32; the angle plate structure evaporation fins 38 staggered on the two tubular structure evaporators 32 can avoid mutual influence and reduce the distance between the two tubular structure evaporators 32; the tips of the angle plate structure evaporation fins 38 on the two tubular structure evaporators 32 face in opposite directions, which can change the flow direction of the circulating water in the process of flowing through the two tubular structure evaporators 32, thereby further improving the heat exchange efficiency and heat exchange effect between the circulating water and the evaporator 32.

[0053] In this embodiment, the heat pump system also includes a drying filter 33, which is arranged on the refrigerant pipe 31 between the evaporator 32 and the compressor 34; the refrigerant gas coming out of the evaporator 32 contains some liquid, and if this part of the liquid directly enters the compressor 34, it will damage the compressor 34, so it is necessary to set a drying filter 33 between the evaporator 32 and the compressor 34 to remove some of the liquid contained in the refrigerant gas.

[0054] In this embodiment, a tap water side thermometer 49 is respectively provided at the inlet and outlet ends of the second heat exchange box 2 to monitor the tap water temperature at the inlet and outlet ends of the second heat exchange box 2; a tap water side flow meter 48 is also provided at the inlet end of the second heat exchange box 2 to monitor the flow rate of the tap water;

[0055] A solar side thermometer 55 is provided at the inlet and outlet of the solar collector 53, respectively, for monitoring the hot water temperature at the inlet and outlet of the solar collector 53; a solar side flow regulating valve 54 and a solar side flow meter 56 are also provided at the outlet of the solar collector 53, for regulating and monitoring the flow of hot water in the solar hot water pipe 51;

[0056] A user-side thermometer 47 is provided on the hot water outlet pipe 50 to monitor the outlet water temperature of the hot water.

[0057] In this embodiment, an electric heater 10 is provided in the hot water tank 44 to be used as an auxiliary heat source in case there is insufficient sunlight or insufficient heat from cooking fumes in winter.

[0058] The working process and principle of this embodiment are as follows:

[0059] In the oil fume system, the 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 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 oil fume is opposite to the flow direction of the circulating water.

[0060] In the circulating water system, the circulating water exchanges heat with the oil smoke in the flue 11 in the fin-tube heat exchanger 23. The low-temperature circulating water absorbs the heat of the 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, transferring 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 absorbing the heat of the 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.

[0061] In a heat pump system, the refrigerant cycle process is represented on a pressure-enthalpy diagram, such as Figure 2 As shown, da represents the change process of the refrigerant in the evaporator 32, ab represents the change process of the refrigerant in the 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 throttle valve 36.

[0062] 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 by the compressor 34 into a high-temperature and high-pressure gas (point b state). The high-temperature and high-pressure gas (point b state) coming out of the 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 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 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 actual engineering, the refrigerant gas coming out of the evaporator 32 contains some liquid. If this part of the liquid directly enters the compressor 34, it will damage the compressor 34. Therefore, a drying filter 33 needs to be set between the evaporator 32 and the compressor 34 to remove the refrigerant liquid.

[0063] In the tap water system, 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, 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 46.

[0064] In the solar energy system, the solar water pump 52 pumps the tap water in the hot water tank 44 into the solar collector 53. The high-temperature tap water heated by the solar collector 53 flows back into the hot water tank 44 and mixes with the original tap water in the hot water tank 44. The average water temperature of the tap water in the hot water tank 44 increases. When the entire system cannot meet the user's heat demand for domestic water, the electric heater 10 in the hot water tank 44 can be turned on to heat the tap water in the hot water tank 44 to meet the user's heat demand for domestic water.

[0065] The beneficial effects of the present invention are:

[0066] Firstly, 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 avoiding 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.

[0067] Secondly, the present invention adds a solar energy system as an auxiliary heat source, which is a renewable energy source. It can use solar energy and waste heat from cooking fumes to heat domestic water, which can better meet the user's heat demand for domestic water.

[0068] Ultimately, the present invention achieves efficient recovery of waste heat in oil smoke, while ensuring the smooth operation of the waste heat recovery system, reducing the impact of dirty oil smoke on the waste heat recovery system, and converting the heat in the oil smoke into domestic water by means of a heat pump system plus a circulating water system. In order to meet users' heat needs for domestic water, a solar energy system is also added as an auxiliary heat source.

[0069] Terminology explanation:

[0070] 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.

[0071] Compressor: The compressor can compress the refrigerant from low-temperature and low-pressure gas into high-temperature and high-pressure gas.

[0072] 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.

[0073] Throttle valve: The throttle valve converts the high-temperature and high-pressure refrigerant liquid into a low-temperature and low-pressure gas-liquid mixture.

[0074] Gas-liquid separator: removes gas from the gas-liquid mixed refrigerant.

[0075] Dry filter: removes liquid from refrigerant gas.

[0076] Oil fume purifier: used to treat oil fume exhaust gas.

[0077] Solar collector: used to absorb sunlight and convert solar energy into thermal energy in hot water, including collector tubes, brackets, connecting pipes, etc.

[0078] 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.

[0079] Evaporation Pressure: The maximum pressure at which a refrigerant changes from liquid to gas.

[0080] 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.

[0081] Condensation pressure: the maximum pressure at which the refrigerant condenses from gas to liquid.

[0082] 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).

[0083] 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.

[0084] 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.

[0085] 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 combined with solar energy, characterized by: Including oil fume system, circulating water system, heat pump system, tap water system and solar energy system; The oil fume system comprises a flue, one end of which is connected to the oil fume fan, and the other end of which is connected to the oil fume purifier; The circulating water system comprises a circulating water pipeline, a circulating pump, a fin-tube heat exchanger and a first heat exchange box, wherein the circulating pump, the fin-tube heat exchanger and the first heat exchange box are connected in sequence through the circulating water pipeline to form a closed-loop circulation circuit; the fin-tube heat exchanger is arranged in the flue between the oil fume fan and the oil fume purifier; a funnel-shaped structure is arranged at the bottom of the flue corresponding to the fin-tube heat exchanger, an oil discharge port is arranged at the bottom of the funnel-shaped structure, and an oil-water collector is arranged at the oil discharge port; an interlayer plate is arranged inside the funnel-shaped structure, and a plurality of leakage holes are arranged in an array on the interlayer plate; a plurality of first guide plates and a plurality of second guide plates are arranged between the interlayer plate and the top of the flue, the top edge and the bottom edge of the first guide plate are respectively connected to the top of the flue and the interlayer plate, the rear edge of the first guide plate is connected to the rear side wall of the flue, and the first There is a gap between the front edge of the guide plate and the front wall of the flue; the top edge and the bottom edge of the second guide plate are connected to the top of the flue and the interlayer plate respectively, the front edge of the second guide plate is connected to the front wall of the flue, and there is a gap between the rear edge of the second guide plate and the rear wall of the flue; the multiple first guide plates and the multiple second guide plates are alternately arranged at equal intervals along the length direction of the flue and form a serpentine oil fume flow channel; the fin-tube heat exchanger is a serpentine structure that matches the serpentine oil fume flow channel and is arranged in the serpentine oil fume flow channel; the fins on the fin-tube heat exchanger are angle plate structures, and the angle plate structure fins have multiple holes arranged in an irregular array; the flow direction of the oil fume in the serpentine oil fume flow channel is opposite to the flow direction of the circulating water in the fin-tube heat exchanger; The heat pump system comprises a refrigerant pipeline, an evaporator, a compressor, a condenser, a throttle valve, a gas-liquid separator and a refrigerant in the refrigerant pipeline; The evaporator, compressor, condenser, throttle valve and gas-liquid separator are connected in sequence through a refrigerant pipeline to form a closed-loop circulation circuit; the evaporator is arranged inside the first heat exchange box; the first heat exchange box is a hollow cylindrical structure, and water inlet pipes are respectively arranged on the outer circumference of both sides of the first heat exchange box, and the two water inlet pipes are not arranged directly opposite to each other, and the water inlet pipes are rectangular tubes extending along the length direction of the first heat exchange box of the hollow cylindrical structure; The evaporator is a tubular structure, and the tubular structure evaporator is coaxially arranged with the hollow cylindrical structure first heat exchange box; a water outlet pipe is arranged inside the first heat exchange box, and the water outlet pipe is extended and arranged along the axis of the first heat exchange box, and the outlet end of the water outlet pipe extends to the outside of the first heat exchange box, and a plurality of water outlet holes are arranged on the water outlet pipe body located inside the first heat exchange box; two tubular structure evaporators are arranged inside the first heat exchange box, the two tubular structure evaporators have different diameters, and the two tubular structure evaporators are coaxially arranged; the evaporation fins on the two tubular structure evaporators are angle plate structures, and the angle plate structure evaporation fins on the two tubular structure evaporators are staggered and arranged with each other, and the tips of the angle plate structure evaporation fins on the two tubular structure evaporators face opposite directions; The tap water system includes a tap water pipeline, a tap water pump, a tap water flow regulating valve, a second heat exchange tank, a hot water tank, a hot water pump, a hot water flow regulating valve and a hot water outlet pipeline which are connected in sequence; the condenser of the heat pump system is arranged inside the second heat exchange tank; The solar energy system comprises a solar water heating pipe, a solar water pump and a solar thermal collector; the solar water pump and the solar thermal collector are connected in sequence with the hot water tank of the tap water system through the solar water heating pipe to form a closed-loop circulation circuit.

2. According to claim 1, a green and energy-saving oil fume waste heat recovery system combined with solar energy is characterized in that: The heat pump system further comprises a drying filter, which is arranged on the refrigerant pipeline between the evaporator and the compressor.

3. The green and energy-saving oil fume waste heat recovery system combined with solar energy according to claim 1 is characterized in that: A tap water side thermometer is respectively provided at the inlet and outlet of the second heat exchange box; a tap water side flow meter is also provided at the inlet of the second heat exchange box; A solar side thermometer is respectively arranged at the inlet and outlet of the solar collector; a solar side flow regulating valve and a solar side flow meter are also arranged at the outlet of the solar collector; A user-side thermometer is arranged on the hot water outlet pipe.

4. The green energy-saving oil fume waste heat recovery system combined with solar energy according to claim 1 is characterized in that: An electric heater is arranged in the hot water tank.

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