Gas stove waste heat recovery adsorption refrigeration system

Abstract

This application provides a waste heat recovery adsorption-type refrigeration system for gas stoves, including a stovetop heat exchange device, a hot water storage tank, a cooling water tank, a refrigeration unit, and a kitchen air conditioner. The stovetop heat exchange device exchanges heat between the stovetop and the hot water storage tank. The refrigeration unit includes two refrigeration chambers, each containing an adsorption / desorption chamber, a condensation chamber, and an evaporation chamber. The adsorption / desorption chamber and the condensation chamber are arranged side-by-side and connected at their upper parts. The evaporation chamber is located below the adsorption / desorption chamber and the condensation chamber, and is connected to both chambers via an evaporation valve and a throttling valve. The adsorption / desorption chamber contains an adsorption bed, the condensation chamber contains a condenser, and the evaporation chamber contains an evaporator. The hot water storage tank and the cooling water tank are connected to the adsorption bed and condenser in the two refrigeration chambers via several multi-port valves, forming a desorption circuit and an adsorption circuit, respectively. The two evaporators are connected in parallel to the kitchen air conditioner, forming an evaporation circuit. This system can utilize waste heat from the stovetop to achieve kitchen cooling and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, specifically to a waste heat recovery adsorption refrigeration system for gas stoves. Background Technology

[0002] Restaurant kitchens are typical high-energy-consuming scenarios. On the one hand, stoves generate a large amount of radiant heat and high-temperature flue gas (usually reaching 200-400℃) from prolonged operation. Traditional methods of handling this waste energy by directly discharging it through the exhaust system. On the other hand, to counteract the heat load generated by cooking and maintain the kitchen temperature within a range that is tolerable for humans, high-power air conditioners are needed, consuming a significant amount of electricity to maintain cooling, further increasing energy consumption. Therefore, restaurant kitchens have long faced the dual challenges of wasted waste of stove flame heat and high-temperature flue gas, as well as high energy consumption for cooling. Utility Model Content

[0003] To address the technical problems mentioned above, this utility model provides a waste heat recovery adsorption refrigeration system for gas stoves.

[0004] The technical solution of this utility model is as follows:

[0005] A waste heat recovery adsorption refrigeration system for gas stoves includes a stove heat exchange device, a hot water storage tank, a cooling water tank, a refrigeration device, and a kitchen air conditioner.

[0006] The stove heat exchanger can exchange heat between the stove and the liquid in the hot water storage tank.

[0007] The refrigeration unit includes two refrigeration chambers, each containing an adsorption / desorption chamber, a condensation chamber, and an evaporation chamber. The adsorption / desorption chamber and the condensation chamber are arranged side by side and connected at their upper parts. The evaporation chamber is located below the adsorption / desorption chamber and the condensation chamber, and is connected to the adsorption / desorption chamber and the condensation chamber respectively through an evaporation valve and a throttling valve. The adsorption / desorption chamber is equipped with an adsorption bed, the condensation chamber is equipped with a condenser, and the evaporation chamber is equipped with an evaporator.

[0008] Both the hot water storage tank and the cooling water tank are connected to the adsorption beds and condensers in the two refrigeration chambers through several multi-way valves. They are configured such that when the hot water storage tank is connected to one adsorption bed to form a desorption circuit, the cooling water tank is connected in series with another adsorption bed and a condenser in a different chamber to form an adsorption circuit. The hot water storage tank can switch between the two adsorption beds.

[0009] The two evaporators are connected in parallel via two three-way valves and then connected to the kitchen air conditioner.

[0010] Furthermore, a spray device is provided inside the evaporation chamber, and a spray pump is provided outside the evaporation chamber, which is connected to the spray device and the bottom of the evaporation chamber. The spray device is located above the evaporator.

[0011] In the above scheme, the adsorption-desorption chamber and the condensation chamber are separated by a vertical plate, and there is a distance between the top edge of the vertical plate and the top wall of the cold chamber.

[0012] Preferably, the distance between the top edge of the vertical plate and the top wall of the cold chamber is 1 / 4 to 1 / 3 of the height of the adsorption-desorption chamber.

[0013] Preferably, the adsorption bed and condenser are positioned below the top edge of the vertical plate.

[0014] In the above scheme, the two refrigeration compartments are separated by a single box body and a vertical partition.

[0015] Preferably, the two refrigeration compartments are arranged symmetrically in the transverse direction.

[0016] Preferably, the two condensers in the two refrigeration chambers are located between the two adsorption beds.

[0017] In the above scheme, the stove heat exchange device includes a first heat exchange coil installed inside the gas stove shell and a second heat exchange coil installed inside the hot water storage tank, with the two heat exchange coils connected in series.

[0018] In the above scheme, the gas stove shell is equipped with a flue gas pipe, and the flue gas pipe and the gas pipe are connected to the same heat exchanger.

[0019] The waste heat recovery adsorption refrigeration system for gas stoves provided by this utility model has the following beneficial effects:

[0020] 1. Through the stove heat exchange device, the high-temperature waste heat energy of the stove flame is efficiently transferred to the adsorption bed of the refrigeration device. Utilizing the thermosensitive characteristics of the adsorbent on the adsorption bed, the adsorption-desorption cycle is triggered to drive the phase change of the refrigerant, converting the heat energy into continuous cooling output at the evaporator end, and finally forming an adaptive cycle of "waste heat input - cooling output".

[0021] 2. The dual adsorption bed alternating operation mechanism is adopted, and the refrigeration process is made continuous through the dual-chamber circulation mode, which solves the problem of intermittent interruption in the traditional single-chamber adsorption refrigeration system and significantly improves refrigeration efficiency and stability.

[0022] 3. It adopts the principle of physical adsorption refrigeration, completely avoiding compressors and chemical refrigerants. It can be installed and used immediately through seamless connection with existing smoke exhaust facilities, ensuring stable cooling and energy regeneration in high-heat and high-humidity kitchen environments. Attached Figure Description

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of a refrigeration circuit of the refrigeration system of this utility model;

[0025] Figure 2 This is a schematic diagram of the refrigeration system of this utility model after switching the refrigeration circuit;

[0026] Figure 3 This is a schematic diagram of the gas stove of this utility model.

[0027] The components represented by the various reference numerals in the diagram are:

[0028] 1. Stove heat exchanger; 11. First heat exchange coil; 12. Second heat exchange coil; 13. Flue gas duct; 14. Gas duct; 15. Heat exchanger; 2. Hot water storage tank; 3. Cooling water tank; 4. Refrigeration unit; 41. Refrigeration chamber; 411. Adsorption-desorption chamber; 412. Condensation chamber; 413. Evaporation chamber; 42. Adsorption bed; 43. Condenser; 44. Evaporator; 45. Vertical plate; 46. Spray device; 47. Spray pump; 48. Liquid collection tank; 5. Kitchen air conditioner; 6. Gas stove shell. Detailed Implementation

[0029] like Figure 1 and Figure 2 As shown in the figure, this utility model embodiment provides a gas stove waste heat recovery adsorption refrigeration system, including a stove heat exchange device 1, a hot water storage tank 2, a cooling water tank 3, a refrigeration device 4, and a kitchen air conditioner 5.

[0030] The stove heat exchange device 1 can exchange heat between the stove and the liquid in the hot water storage tank 2. This structure will be described in detail later.

[0031] The refrigeration device 4 includes two refrigeration chambers 41, each containing an adsorption-desorption chamber 411, a condensation chamber 412, and an evaporation chamber 413. The adsorption-desorption chamber 411 and the condensation chamber 412 are arranged side-by-side and connected at their upper parts, allowing the desorbed adsorbate to flow from the adsorption-desorption chamber 411 to the condensation chamber 412 for cooling and liquefaction. The evaporation chamber 413 is located below the adsorption-desorption chamber 411 and the condensation chamber 412, and is connected to both chambers via an evaporation valve and a throttling valve.

[0032] The adsorption-desorption chamber 411 is provided with an adsorption bed 42, on which an adsorbent, such as a silica-based composite adsorbent, is placed. The adsorbent has thermosensitive properties. When heated, its adsorption capacity decreases, and the adsorption force on the adsorbate decreases, causing the adsorbate to be desorbed. When cooled, its adsorption capacity increases, and the adsorption force on the adsorbate increases, thus adsorbing the adsorbate.

[0033] A condenser 43 is provided in the condensation chamber 412 to cool the adsorbate flowing into the condensation chamber 412 and liquefy the adsorbate.

[0034] An evaporator 44 is provided in the evaporation chamber 413 for evaporating the liquid adsorbate in the evaporation chamber 413.

[0035] Both the hot water storage tank 2 and the cooling water tank 3 are connected to the adsorption beds 42 and condensers 43 in the two refrigeration compartments 41 via several multi-way valves. The system is configured such that when the hot water storage tank 2 is connected to one adsorption bed 42 to form a desorption circuit, the cooling water tank 3 is connected in series with the other adsorption bed 42 and the condenser 43 outside the compartment to form an adsorption circuit. The hot water storage tank 2 can switch between the two adsorption beds 42. The two evaporators 44 are connected to the kitchen air conditioner 5 after being connected in parallel via two three-way valves.

[0036] In this embodiment, the refrigeration system exchanges heat between the stove heat exchange device 1 and the liquid in the hot water storage tank 2 to recover the residual heat of the gas stove flame. The recovered heat is used to desorb the adsorbate in an adsorption bed 42. The desorbed adsorbate is liquefied by the condenser 43 in the same compartment and flows into the evaporation chamber 413 for storage.

[0037] In another compartment, the liquid adsorbate in evaporation chamber 413 is evaporated by evaporator 44. During the evaporation process, the condensate in evaporator 44 is cooled, and the cooled condensate flows into kitchen air conditioner 5 for kitchen cooling. The vaporized adsorbate flows through evaporation valve to adsorption-desorption chamber 411. The adsorption bed 42 in this chamber is connected to cooling water tank 3 and has a low temperature, which adsorbs the gaseous adsorbate.

[0038] After passing through a preset interval, the connection is switched, connecting the hot water storage tank 2 to the adsorption bed 42 in another compartment. This allows the desorption, evaporation, and adsorption processes to switch between the two compartments, achieving continuous cooling. Figure 2 As shown.

[0039] The refrigeration system in this embodiment realizes the recovery of residual heat from the gas stove flame through the stove heat exchange device 1, and utilizes the recovered heat in combination with the two-compartment, three-chamber structure of the refrigeration device 4 to achieve continuous refrigeration, significantly improving refrigeration efficiency and stability.

[0040] Specifically, in this embodiment, the two cooling chambers 41 are separated by a box body through a vertical partition. The two cooling chambers 41 are arranged symmetrically in the horizontal direction, and the two condensers 43 in the two cooling chambers 41 are located between the two adsorption beds 42, so that the two adsorption beds 42 are far away from each other, avoiding them from getting close to each other and affecting each other at low and high temperatures, thus reducing the adsorption and desorption effects.

[0041] The adsorption-desorption chamber 411 and the condensation chamber 412 are separated by a vertical plate 45. There is a distance between the top edge of the vertical plate 45 and the top wall of the cold chamber. This distance is preferably 1 / 4 to 1 / 3 of the height of the adsorption-desorption chamber 411 to ensure the flow of gaseous adsorbate.

[0042] The adsorption bed 42 and the condenser 43 are positioned below the top edge of the vertical plate 45 to achieve isolation between them.

[0043] In this embodiment, both the adsorption bed 42 and the condenser 43 are serpentine tubular, and fins are provided on the outer side of the tube wall to increase the contact area with the adsorbate and improve the refrigeration efficiency and effect.

[0044] In practical applications, the serpentine tubes of the adsorption bed 42 and the condenser 43 can be arranged vertically, that is, the tubes extend from top to bottom in a serpentine manner, which increases the vertical length of the adsorption bed 42 and the condenser 43, thereby improving the adsorption and desorption effects of the adsorption bed 42 and the condensation effect of the condenser 43.

[0045] A spray device 46 may also be installed inside the evaporation chamber 413, and a spray pump 47 is installed outside the evaporation chamber 413, which is connected to the spray device 46 and the bottom of the evaporation chamber 413. The spray device 46 is located above the evaporator 44. When the evaporator 44 is running, the spray device 46 sprays the liquid adsorbate in the evaporation chamber 413 onto the evaporator 44 to improve the evaporation efficiency and rate of the liquid adsorbate.

[0046] Furthermore, the bottom wall of the evaporation chamber 413 is recessed near the spray pump 47, with a liquid collection tank 48. The spray pump 47 is connected to the bottom of the liquid collection tank 48. When the liquid adsorbate in the evaporation chamber 413 decreases to a small amount, the liquid adsorbate can also be collected in the liquid collection tank 48 for the spray pump 47 to extract, ensuring the evaporation of the liquid adsorbate.

[0047] In this embodiment, the evaporator 44 is also a serpentine tube, and fins are provided on the outer side of the tube wall. In this embodiment, the tube of the evaporator 44 is also vertically arranged, such as... Figure 1 As shown. In a more preferred embodiment, the serpentine tube of the evaporator 44 can be arranged laterally, that is, the tube extends laterally in a serpentine shape, so as to increase the lateral area of ​​the evaporator 44, thereby increasing the contact area with the liquid adsorbent in the evaporation chamber 413, and at the same time increasing the area of ​​the adsorbent sprayed by the spraying device 46, thus improving the evaporation effect.

[0048] In this embodiment, the multi-way valves include three four-way valves and two three-way valves, plus two three-way valves connected to the evaporator 44, for a total of seven. This embodiment is for ease of explanation, combined with... Figure 1 and Figure 2 As shown, the three four-way valves are named Valve 1, Valve 2, and Valve 3, and the four three-way valves are named Valve 4, Valve 5, Valve 6, and Valve 7.

[0049] In addition, for ease of explanation of the piping connections, the two refrigeration compartments 41 are named Compartment One and Compartment Two, such as... Figure 1 and Figure 2 As shown.

[0050] The four ports of valve one are connected to the outlet of the hot water storage tank 2, the upper port of the adsorption bed 42 in chamber one, valve two, and valve four, respectively. The other three ports of valve two are connected to the outlet of the cooling water tank 3, the upper port of the adsorption bed 42 in chamber two, and the upper port of the condenser 43 in chamber two, respectively. A water pump is installed on the pipeline between valve two and the outlet of the cooling water tank 3. The other two ports of valve four are connected to the inlet of the cooling water tank 3 and the upper port of the condenser 43 in chamber one, respectively.

[0051] The four ports of valve three are connected to the inlet of the hot water storage tank 2, the lower port of the adsorption bed 42 in compartment one, the lower port of the condenser 43 in compartment two, and valve five, respectively. A water pump is installed on the pipeline between valve three and the inlet of the hot water storage tank 2. The other two ports of valve five are connected to the lower ports of the condenser 43 in compartment one and the lower ports of the adsorption bed 42 in compartment two, respectively.

[0052] The three ports of valve six are respectively connected to the upper port of evaporator 44 in compartment one, the upper port of evaporator 44 in compartment two, and the outlet of galley air conditioner 5. A water pump is installed on the pipeline between valve six and the outlet of galley air conditioner 5.

[0053] The three ports of valve seven are respectively connected to the lower port of evaporator 44 in cabin one, the lower port of evaporator 44 in cabin two, and the inlet of kitchen air conditioner 5.

[0054] like Figure 1 and Figure 2 As shown, this embodiment provides two sets of cooling circuits, which are switched at preset intervals and used alternately. The two sets of cooling circuits are as follows:

[0055] Refrigeration circuit one includes desorption circuit one, adsorption circuit one, and evaporation circuit one.

[0056] The liquid flow sequence in the desorption circuit is as follows: outlet of hot water storage tank 2 → valve 1 → adsorption bed 42 in chamber 1 → valve 3 → inlet of hot water storage tank 2.

[0057] The liquid flow sequence in adsorption circuit 1 is as follows: outlet of cooling water tank 3 → valve 2 → adsorption bed 42 in chamber 2 → valve 5 → condenser 43 in chamber 1 → valve 4 → inlet of cooling water tank 3.

[0058] The liquid flow sequence in evaporation circuit 1 is as follows: kitchen air conditioner 5 outlet → valve 6 → evaporator 44 in compartment 2 → valve 7 → kitchen air conditioner 5 inlet.

[0059] Refrigeration circuit two includes desorption circuit two, adsorption circuit two, and evaporation circuit two.

[0060] The liquid flow sequence in the second desorption circuit is as follows: outlet of hot water storage tank 2 → valve 1 → valve 2 → adsorption bed 42 in chamber 2 → valve 5 → valve 3 → inlet of hot water storage tank 2.

[0061] The liquid flow sequence in adsorption loop 2 is as follows: Cooling water tank 3 outlet → Valve 2 → Condenser 43 in compartment 2 → Valve 3 → Adsorption bed 42 in compartment 1 → Valve 1 → Valve 4 → Cooling water tank 3 inlet.

[0062] The liquid flow sequence in evaporation circuit 2 is as follows: kitchen air conditioner 5 outlet → valve 6 → evaporator 44 in compartment 1 → valve 7 → kitchen air conditioner 5 inlet.

[0063] The desorption circuits one and two described above are used to release the adsorbate on the adsorption bed 42 in the circuit; the adsorption circuits one and two are used to cool and liquefy the desorbed adsorbate, and at the same time adsorb the gaseous adsorbate that enters the adsorption-desorption chamber 411 from the evaporation chamber 413 in another chamber; the evaporation circuits one and two are used to evaporate the liquid adsorbate in the evaporation chamber 413, and use the heat absorbed by the evaporation of the adsorbate to cool the liquid in the evaporation circuit, which flows into the kitchen air conditioner 5 to achieve refrigeration. At the same time, the evaporated adsorbate flows into the adsorption-desorption chamber 411 for adsorption on the adsorption bed 42 in the adsorption circuit, forming a closed loop.

[0064] In the above circuit, the liquid temperature in the adsorption circuit is lower than the liquid temperature in the evaporation circuit, and the liquid temperature in the evaporation circuit is lower than the liquid temperature in the desorption circuit.

[0065] Preferably, the temperature of the liquid flowing out of the cooling water tank 3 is lower than the ambient temperature, the temperature of the liquid flowing out of the kitchen air conditioner 5 is the ambient temperature, and the temperature of the liquid flowing out of the hot water storage tank 2 is higher than the ambient temperature.

[0066] In addition, such as Figure 1 and Figure 3 As shown, the stove heat exchange device 1 includes a first heat exchange coil 11 installed inside the gas stove housing 6 and a second heat exchange coil 12 installed inside the hot water storage tank 2. The two heat exchange coils are connected in series to form a heat exchange circuit. A water pump is installed on the heat exchange circuit.

[0067] Multiple first heat exchange coils 11 can be connected in parallel on the heat exchange circuit to recover residual flame heat from multiple gas stoves.

[0068] The gas stove housing 6 is equipped with a flue gas pipe 13 and a gas pipe 14. The flue gas pipe 13 and the gas pipe 14 are connected to the same heat exchanger 15, which exchanges heat between the high-temperature flue gas and the low-temperature gas, so that the gas is preheated in advance, improving the gas combustion efficiency while reducing pollutants generated by incomplete combustion.

[0069] In this embodiment, water is used as the medium flowing in the heat exchange circuit, adsorption circuit, desorption circuit, and evaporation circuit. In some other embodiments, other liquid media may be used if the same effect can be achieved.

[0070] The following experiments demonstrate that the refrigeration system provided in this embodiment can significantly reduce energy consumption.

[0071] Requirements: Summer, high school cafeteria, 3000-3500 diners, 20 stir-fry stoves, 6 large wok stoves, kitchen cooking area of ​​400m². 2 The cooking time for breakfast, lunch, and dinner is 1.5 hours.

[0072] Table 1. Test Results of Energy-Saving Stoves

[0073]

[0074] During a total cooking period of 4.5 hours, the total waste heat recovery is approximately 400 kWh, while the total cooling capacity of the kitchen is approximately 360 kWh. The estimated annual electricity savings are approximately 30,000 yuan.

Claims

1. A gas cooking waste heat recovery adsorption refrigeration system, characterized in that, It includes a stove heat exchange device (1), a hot water storage tank (2), a cooling water tank (3), a refrigeration device (4), and a kitchen air conditioner (5); The stove heat exchange device (1) can exchange heat between the stove and the liquid in the hot water storage tank (2); The refrigeration device (4) includes two refrigeration chambers (41). The refrigeration chamber (41) includes an adsorption-desorption chamber (411), a condensation chamber (412), and an evaporation chamber (413). The adsorption-desorption chamber (411) and the condensation chamber (412) are arranged side by side and connected at the top. The evaporation chamber (413) is located below the adsorption-desorption chamber (411) and the condensation chamber (412) and is connected to the adsorption-desorption chamber (411) and the condensation chamber (412) through an evaporation valve and a throttling valve, respectively. The adsorption-desorption chamber (411) is provided with an adsorption bed (42), the condensation chamber (412) is provided with a condenser (43), and the evaporation chamber (413) is provided with an evaporator (44). The hot water storage tank (2) and the cooling water tank (3) are connected to the adsorption bed (42) and condenser (43) in the two refrigeration chambers (41) through several multi-port valves. They are configured such that when the hot water storage tank (2) is connected to one adsorption bed (42) to form a desorption circuit, the cooling water tank (3) is connected in series with another adsorption bed (42) and the condenser (43) in a different chamber to form an adsorption circuit. The hot water storage tank (2) can switch between the two adsorption beds (42). The two evaporators (44) are connected in parallel via two three-way valves and then connected to the kitchen air conditioner (5).

2. A gas cooking waste heat recovery adsorption refrigeration system as claimed in claim 1 wherein, A spray device (46) is provided inside the evaporation chamber (413), and a spray pump (47) is provided outside the evaporation chamber (413), which is connected to the spray device (46) and the bottom of the evaporation chamber (413). The spray device (46) is located above the evaporator (44).

3. A gas cooktop waste heat recovery adsorption refrigeration system as claimed in claim 1 wherein, The adsorption-desorption chamber (411) and the condensation chamber (412) are separated by a vertical plate (45), and there is a distance between the top edge of the vertical plate (45) and the top wall of the cold chamber.

4. The gas stove waste heat recovery adsorption refrigeration system as described in claim 3, characterized in that, The distance between the top edge of the vertical plate (45) and the top wall of the cold chamber is 1 / 4 to 1 / 3 of the height of the adsorption-desorption chamber (411).

5. The gas stove waste heat recovery adsorption refrigeration system as described in claim 4, characterized in that, The adsorption bed (42) and the condenser (43) are positioned below the top edge of the vertical plate (45).

6. The gas stove waste heat recovery adsorption refrigeration system as described in claim 1, characterized in that, The two refrigerated compartments (41) are separated by a box body through a vertical partition.

7. The gas stove waste heat recovery adsorption refrigeration system as described in claim 6, characterized in that, The two refrigeration compartments (41) are arranged symmetrically in the horizontal direction.

8. The gas stove waste heat recovery adsorption refrigeration system as described in claim 7, characterized in that, Two condensers (43) in two refrigeration chambers (41) are located between two adsorption beds (42).

9. The waste heat recovery adsorption refrigeration system for a gas stove as described in claim 1, characterized in that, The stove heat exchange device (1) includes a first heat exchange coil (11) installed in the gas stove shell (6) and a second heat exchange coil (12) installed in the hot water storage tank (2), with the two heat exchange coils connected in series.

10. The gas stove waste heat recovery adsorption refrigeration system as described in claim 1, characterized in that, The gas stove housing (6) is provided with a flue gas pipe (13), and the flue gas pipe (13) and the gas pipe (14) are connected to the same heat exchanger (15).

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