Direct-fired absorption refrigeration device

Abstract

The utility model relates to the technical field of absorption refrigeration equipment, and provides a direct-fired absorption refrigeration device which comprises a combustor, a high-pressure generator connected with the combustor and a high-temperature heat exchanger, a low-pressure generator connected with the high-pressure generator, a condenser connected with the low-pressure generator, an evaporator connected with the condenser, and an absorber connected with the evaporator. The high-temperature heat exchanger is connected with the low-temperature heat exchanger and the low-pressure generator The flue gas output end of the combustor communicates with a first flue gas aeration assembly, the first flue gas aeration assembly is arranged in a first flue gas waste heat recovery box, a first heat exchange pipe is arranged in the first flue gas waste heat recovery box, the first flue gas waste heat recovery box communicates with a second flue gas aeration assembly, and the second flue gas aeration assembly is arranged in a second flue gas waste heat recovery box. The second flue gas waste heat recovery box is communicated with a discharge pipeline; the first flue gas waste heat recovery box further communicates with a cleaning assembly. According to the utility model, the waste heat of flue gas generated after combustion of the combustor can be fully utilized, and the utilization rate of resources is improved.

Description

Technical Field

[0001] This utility model relates to the field of absorption refrigeration equipment technology, and in particular to a direct-fired absorption refrigeration device. Background Technology

[0002] Absorption chiller: Based on the principle of heat absorption during liquid vaporization, a chiller relies on the action of an absorber-generator group to complete the refrigeration cycle. It uses a binary solution as the working fluid, in which the low-boiling-point component is used as the refrigerant, that is, its evaporation is used for refrigeration; the high-boiling-point component is used as the absorbent, that is, its absorption of refrigerant vapor is used to complete the working cycle.

[0003] Currently, absorption chillers mainly fall into the following types: hot water absorption chillers, steam absorption chillers, flue gas absorption chillers, and direct-fired absorption chillers. Many direct-fired absorption chillers exist, such as the Chinese utility model patent with patent number CN201920949171.7, entitled "A Direct-Fired Lithium Bromide Absorption Chiller with Single-Effect Heat Pump Heating Function." This patent includes a burner, evaporator, absorber, direct-fired high-pressure generator, low-pressure generator, first condenser, second condenser, high-temperature heat exchanger, low-temperature heat exchanger, solution pump, refrigerant pump, and a high-flow-rate solution connecting pipe with a first solution switching valve. The high-flow-rate refrigerant vapor outlet pipe is simultaneously connected to the low-flow-rate vapor inlet pipe and the first condenser. The absorber's steam inlet pipe is connected to the absorber's outlet pipe; the absorber's outlet pipe is simultaneously connected to the inlet pipes of both the first and second condensers. A first valve is installed on the first condenser's inlet pipe, and a second valve is installed on the second condenser's inlet pipe. This allows for dual-purpose operation, providing a heating and cooling device for suitable locations, reducing equipment investment costs and saving space. However, this device cannot fully utilize the waste heat from the flue gas after combustion, and the waste heat from the flue gas still accounts for a certain proportion of the total heat resources, resulting in a waste of combustion waste heat. Currently, there are some gas waste heat recovery devices, but most of them have complex structures. Over time, impurities in the flue gas will accumulate, affecting the smoothness of the pipes and thus the efficiency of waste heat absorption. Utility Model Content

[0004] In order to overcome the defects of the prior art mentioned above, this utility model provides a direct-fired absorption refrigeration device that can make full use of the waste heat of flue gas after combustion and improve the utilization rate of resources.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A direct-fired absorption refrigeration device includes a burner connected to a high-pressure generator and a high-temperature heat exchanger, the high-pressure generator connected to a low-pressure generator, the low-pressure generator connected to a condenser, the condenser connected to an evaporator, the evaporator connected to an absorber, the high-temperature heat exchanger connected to a low-temperature heat exchanger and the low-pressure generator, and the low-temperature heat exchanger connected to the absorber and the low-pressure generator.

[0007] The flue gas output end of the burner is connected to a first flue gas aeration component. The first flue gas aeration component is located in the heat exchange medium of a first flue gas waste heat recovery box. The heat exchange medium of the first flue gas waste heat recovery box is provided with a first heat exchange tube connected to the low-pressure generator. The first flue gas waste heat recovery box is connected to a second flue gas aeration component through a connecting component. The second flue gas aeration component is located in the heat exchange medium of a second flue gas waste heat recovery box. The heat exchange medium of the second flue gas waste heat recovery box is provided with a second heat exchange tube connected to domestic water. The end of the second flue gas waste heat recovery box away from the connecting component is connected to an exhaust pipe.

[0008] The first flue gas waste heat recovery box is also connected to a cleaning component for cleaning the heat exchange medium.

[0009] As an improved technical solution, both the first flue gas aeration component and the second flue gas aeration component include an aeration pipe, and a plurality of aeration discs are arranged and installed on the aeration pipe.

[0010] As an improved technical solution, the connecting component includes a connecting pipe, one end of which is connected to the top of the first flue gas waste heat recovery box, and the other end is connected to the second flue gas aeration component. A fan and a check valve are also installed on the connecting pipe.

[0011] As an improved technical solution, the cleaning component includes a first heat exchange medium conveying pipe, on which a conveying pump is installed. One end of the first heat exchange medium conveying pipe is connected to the bottom of the first flue gas waste heat recovery box, and the other end is connected to the cleaning box. A filter assembly is provided inside the cleaning box and is installed on a lifting and moving assembly. A second heat exchange medium conveying pipe is connected to the end of the cleaning box away from the first heat exchange medium conveying pipe, and the end of the second heat exchange medium conveying pipe away from the cleaning box is connected to the first flue gas waste heat recovery box.

[0012] As an improved technical solution, the filter assembly includes a connecting plate, and several filter plate groups are arranged and installed on the side of the connecting plate near the cleaning box. Each filter plate group consists of several layers of filter screens.

[0013] As an improved technical solution, the lifting and moving assembly includes a moving frame, a moving plate slidably mounted on the moving frame, a lifting motor mounted on the moving plate, and two synchronously wound lifting belts mounted on the output shaft of the lifting motor. The ends of the lifting belts away from the lifting motor pass around guide wheels mounted on the moving plate and are connected to the connecting plate.

[0014] The two ends of the movable plate along the moving direction of the movable frame are respectively connected to the moving traction rope;

[0015] The bottom of the movable frame away from the cleaning box is provided with a filter plate cleaning component, and a limiting block is provided on the movable frame and near the filter plate cleaning component and the cleaning box respectively.

[0016] As an improved technical solution, the filter plate assembly cleaning component includes a cleaning box, in which several cleaning roller groups are arranged at equal intervals, and a space for cleaning the filter plate assembly is formed between two adjacent cleaning roller groups. The cleaning box also contains cleaning liquid, and the cleaning roller groups are partially immersed in the cleaning liquid.

[0017] After adopting the above technical solution, the beneficial effects of this utility model are:

[0018] A first flue gas aeration component is connected to the flue gas output end of the burner. This component is located within the heat exchange medium of a first flue gas waste heat recovery box. The heat exchange medium in the first flue gas waste heat recovery box contains a first heat exchange tube connected to a low-pressure generator. The first flue gas waste heat recovery box is connected to a second flue gas aeration component via a connecting component. This second component is located within the heat exchange medium of a second flue gas waste heat recovery box. The heat exchange medium in the second flue gas waste heat recovery box contains a second heat exchange tube connected to domestic water. A discharge pipe is connected to the end of the second flue gas waste heat recovery box furthest from the connecting component. A cleaning component for cleaning the heat exchange medium is also connected to the first flue gas waste heat recovery box. Through the first and second flue gas aeration components, the combusted flue gas fully contacts the heat exchange medium, absorbing heat from the flue gas and raising the temperature of the heat exchange medium. The heat exchange medium exchanges heat with the first and second heat exchange tubes, thus improving the temperature of the medium within the first and second heat exchange tubes. As the temperature rises during operation, the first flue gas waste heat recovery box comes into contact with the flue gas first, followed by the second. Therefore, the temperature of the heat exchange medium in the first flue gas waste heat recovery box is higher than that in the second. Consequently, the first heat exchange tube transfers heat to the low-pressure generator, heating the lithium bromide solution within for system cooling. The second heat exchange tube is connected to the domestic water supply, heating the domestic water. This process achieves full absorption and utilization of the flue gas waste heat. The first flue gas waste heat recovery box is also connected to a cleaning component for cleaning the heat exchange medium. Since the heat exchange medium in the first flue gas waste heat recovery box exchanges heat with the flue gas first, impurities contained in the flue gas will enter the heat exchange medium in the first flue gas waste heat recovery box. The cleaning component can clean the impurities in the heat exchange medium in the first flue gas waste heat recovery box, preventing the heat exchange medium from becoming turbid after prolonged use, which would affect heat transfer efficiency.

[0019] In summary, this utility model provides a direct-fired absorption refrigeration device that can fully utilize the waste heat of flue gas after combustion in the burner, thereby improving resource utilization. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. In addition, the elements or parts in the drawings are not necessarily drawn to actual scale.

[0021] Figure 1 This is a schematic diagram of the direct-fired absorption refrigeration device in this utility model;

[0022] Figure 2 This is a schematic diagram of the flue gas waste heat recovery box and cleaning components in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the first flue gas waste heat recovery box and the second flue gas waste heat recovery box in this utility model;

[0024] Figure 4 This is a schematic diagram of the cleaning component in this utility model;

[0025] Figure label:

[0026] 1. Burner; 2. High-pressure generator; 3. High-temperature heat exchanger; 4. Low-pressure generator; 5. Condenser; 6. Evaporator; 7. Absorber; 8. Low-temperature heat exchanger; 9. First flue gas aeration assembly; 901. Aeration pipe; 902. Aeration disc; 10. First flue gas waste heat recovery box; 11. First heat exchange tube; 12. Connecting assembly; 1201. Connecting pipe; 1202. Fan; 1203. Check valve; 13. Second flue gas aeration assembly; 14. Second flue gas waste heat recovery box; 15. Second heat exchange tube; 16. Discharge pipe; 17. Cleaning assembly; 1701. First heat exchange medium. 1702. Conveying pipeline, 1703. Conveying pump, 1704. Cleaning box, 1705. Filter assembly, 17041. Connecting plate, 17042. Filter plate assembly, 1705. Lifting and moving assembly, 17051. Moving frame, 17052. Moving plate, 17053. Lifting motor, 17054. Lifting belt, 17055. Guide wheel, 17056. Moving traction rope, 17057. Limiting block, 1706. Second heat exchange medium conveying pipeline, 18. Filter plate assembly cleaning assembly, 1801. Cleaning box, 1802. Cleaning roller assembly, 19. Refrigerant water pipeline, 20. Cooling water pipeline. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] Combination Figures 1-4 As shown, a direct-fired absorption refrigeration device includes a burner 1, which is connected to a high-pressure generator 2 and a high-temperature heat exchanger 3. The high-pressure generator 2 is connected to a low-pressure generator 4, which is connected to a condenser 5. The condenser 5 is connected to an evaporator 6, which is connected to an absorber 7. The high-temperature heat exchanger 3 is connected to a low-temperature heat exchanger 8 and the low-pressure generator 4. The low-temperature heat exchanger 8 is connected to the absorber 7 and the low-pressure generator 4. In addition, a refrigerant water pipe 19 is provided in the evaporator 6, and a cooling water pipe 20 is provided in the condenser 5 and the absorber 7. The operation and control process of the burner 1, the high-pressure generator 2, the low-pressure generator 4, the high-temperature heat exchanger 3, the low-temperature heat exchanger 8, the condenser 5, the evaporator 6, and the absorber 7 are common knowledge to those skilled in the art and will not be described in detail here. For details, please refer to the Chinese utility model patent with patent number CN201320031316.8, entitled "A Direct-Fired Hot Water Dual-Purpose Lithium Bromide Absorption Unit", and the applicant is Shandong Luxi New Energy Technology Co., Ltd.

[0032] In addition, there are pipes and various valves between the components, which are common in daily life and are common knowledge to those skilled in the art, and are not shown in the figure.

[0033] The flue gas output end of burner 1 is connected to the first flue gas aeration assembly 9, which is located within the heat exchange medium of the first flue gas waste heat recovery box 10. The heat exchange medium of the first flue gas waste heat recovery box 10 contains a first heat exchange tube 11 connected to the low-pressure generator 4. The first flue gas waste heat recovery box 10 is connected to the second flue gas aeration assembly 13 via a connecting assembly 12. The second flue gas aeration assembly 13 is located within the heat exchange medium of the second flue gas waste heat recovery box 14. The heat exchange medium of the second flue gas waste heat recovery box 14 contains a second heat exchange tube 15 connected to domestic water. An exhaust pipe 16 is connected to the end of the second flue gas waste heat recovery box 14 furthest from the connecting assembly 12. The first flue gas aeration assembly 9 and the second flue gas aeration assembly 13 ensure that the combusted flue gas is in full contact with the heat exchange medium. The heat exchange medium absorbs heat from the flue gas, raising its temperature. It then exchanges heat with the first heat exchange tube 11 and the second heat exchange tube 15, further increasing the temperature of the medium within them. During operation, the first flue gas waste heat recovery box 10 contacts the flue gas first, followed by the second flue gas waste heat recovery box 14. Therefore, the temperature of the heat exchange medium in the first flue gas waste heat recovery box 10 is higher than that in the second flue gas waste heat recovery box 14. Consequently, the first heat exchange tube 11 transfers heat to the low-pressure generator 4, heating the lithium bromide solution within for system cooling. The second heat exchange tube 15 connects to domestic water, heating it, thus achieving full absorption and utilization of the flue gas waste heat.

[0034] The first flue gas waste heat recovery box 10 is also connected to a cleaning component 17 for cleaning the heat exchange medium. Since the heat exchange medium in the first flue gas waste heat recovery box 10 first exchanges heat with the flue gas, impurities contained in the flue gas will enter the heat exchange medium of the first flue gas waste heat recovery box 10. The cleaning component 17 can clean the impurities in the heat exchange medium of the first flue gas waste heat recovery box 10, so as to avoid the heat exchange medium becoming turbid after long-term use, which would affect the heat transfer efficiency.

[0035] Combination Figures 2-3 As shown, both the first flue gas aeration component 9 and the second flue gas aeration component 13 include an aeration pipe 901, and a number of aeration discs 902 are arranged on the aeration pipe 901. By setting a number of aeration discs 902, the flue gas can fully contact and exchange heat with the heat exchange medium in the first flue gas waste heat recovery box 10 and the second flue gas waste heat recovery box 14, thereby improving the heat exchange efficiency.

[0036] In addition, a check valve 1203 is installed at the flue gas inlet end of the aeration pipe 901. The application of valves on pipelines is common knowledge to those skilled in the art and will not be described in detail here.

[0037] Combination Figures 2-3As shown, the connecting component 12 includes a connecting pipe 1201. One end of the connecting pipe 1201 is connected to the top of the first flue gas waste heat recovery box 10, and the other end is connected to the second flue gas aeration component 13. A fan 1202 and a check valve 1203 are also installed on the connecting pipe 1201. By setting up the fan 1202, the check valve 1203 and the connecting pipe 1201, the flue gas in the first flue gas waste heat recovery box 10 after one heat exchange can be transported to the second flue gas waste heat recovery box 14 for a second heat exchange, so as to fully absorb the waste heat in the flue gas, reduce the temperature of the flue gas, and improve the energy utilization efficiency.

[0038] Combination Figure 2 and Figure 4 As shown, the cleaning assembly 17 includes a first heat exchange medium conveying pipe 1701, on which a conveying pump 1702 is installed. One end of the first heat exchange medium conveying pipe 1701 is connected to the bottom of the first flue gas waste heat recovery box 10, and the other end is connected to the cleaning box 1703. A filter assembly 1704 is provided inside the cleaning box 1703, and the filter assembly 1704 is installed on a lifting and moving assembly 1705. A second heat exchange medium conveying pipe 1706 is connected to the end of the cleaning box 1703 away from the first heat exchange medium conveying pipe 1701. The second heat exchange medium conveying pipe 1706 is away from the cleaning box 1703. One end is connected to the first flue gas waste heat recovery box 10. The heat exchange medium in the first flue gas waste heat recovery box 10 can be transported to the cleaning box 1703 through the first heat exchange medium conveying pipe 1701 and the conveying pump 1702. The heat exchange medium in the cleaning box 1703 can be filtered through the filter component 1704 to filter out the impurities after the flue gas combustion in the heat exchange medium and improve the heat transfer efficiency of the heat exchange medium. The filter component 1704 can be lifted and moved through the lifting and moving component 1705. The filtered heat exchange medium can be transported back to the first flue gas waste heat recovery box 10 through the second heat exchange medium conveying pipe 1706.

[0039] Combination Figure 2 and Figure 4 As shown, the filter assembly 1704 includes a connecting plate 17041. Several filter plate groups 17042 are arranged and installed on the side of the connecting plate 17041 near the cleaning box 1703. Each filter plate group 17042 is composed of several layers of filter screen. By setting several layers of filter screen, it is convenient to filter impurities in the heat exchange medium. By setting the connecting plate 17041, it is convenient to move the filter assembly 1704 as a whole.

[0040] Combination Figure 2 and Figure 4As shown, the lifting and moving assembly 1705 includes a moving frame 17051, on which a moving plate 17052 is slidably mounted. Specifically, sliders are mounted on both sides of the moving plate 17052 along the moving direction. A slide rail is mounted on the moving frame 17051 to slide smoothly on the moving frame 17051, allowing the moving plate 17052 to slide smoothly via the sliders and slide rails. The structure of the slide rails and sliders is common knowledge to those skilled in the art and is not shown in the figure. A lifting motor 170 is mounted on the moving plate 17052. 53. Two synchronously winding lifting belts 17054 are installed on the output shaft of the lifting motor 17053. The ends of the lifting belts 17054 away from the lifting motor 17053 pass around the guide wheels 17055 installed on the moving plate 17052 and are connected to the connecting plate 17041. The rotation of the output shaft of the lifting motor 17053 can drive the two lifting belts 17054 to rise or fall synchronously, thereby driving the connecting plate 17041 to rise or fall synchronously, thereby lifting or lowering the filter assembly 1704 from the cleaning box 1703.

[0041] In addition, a through hole for mounting the guide wheel 17055 is provided on the movable plate 17052 and near the guide wheel 17055. The guide wheel 17055 is rotatably mounted in the through hole via a rotating shaft. The lifting belt 17054 passes around the guide wheel 17055 and through the through hole to connect with the connecting plate 17041.

[0042] The movable plate 17052 is connected to two ends of the movable frame 17051 along the moving direction of the movable plate 17052. The movable traction rope 17056 is connected to the traction motor. The movable plate 17052 can be pulled to move back and forth on the movable frame 17051 by the movable traction rope 17056.

[0043] A filter plate assembly cleaning component 18 is provided at the bottom of the end of the movable frame 17051 away from the cleaning box 1703. Limiting blocks 17057 are respectively provided on the movable frame 17051 and near the filter plate assembly cleaning component 18 and the cleaning box 1703. The filter plate assembly 17042 can be cleaned periodically by the filter plate assembly cleaning component 18 to remove impurities attached to the surface after filtration. The moving plate 17052 can be moved and positioned by the limiting blocks 17057. After the moving plate 17052 stops moving, the filter assembly 1704 can be aligned with the cleaning box 1703 and the filter plate assembly cleaning component 18.

[0044] Combination Figure 2 and Figure 4As shown, the filter plate assembly cleaning component 18 includes a cleaning tank 1801. Several cleaning roller groups 1802 are arranged at equal intervals inside the cleaning tank 1801. A space for cleaning the filter plate assembly 17042 is formed between two adjacent cleaning roller groups 1802. The cleaning tank 1801 is also filled with cleaning liquid. The cleaning roller groups 1802 are partially immersed in the cleaning liquid. The filter plate assembly 17042 can be cleaned by the several cleaning roller groups 1802 to remove impurities attached to the surface. At the same time, with the help of the cleaning liquid, the cleaning is more thorough. In this embodiment, the cleaning liquid can be water.

[0045] For ease of understanding, the working process of this embodiment is described below:

[0046] Combination Figures 1-4 As shown, firstly, the flue gas generated by the burner 1 enters the first flue gas waste heat recovery box 10 through the first flue gas aeration assembly 9, and exchanges heat with the heat exchange medium in the first flue gas waste heat recovery box 10, causing the temperature of the heat exchange medium in the first flue gas waste heat recovery box 10 to rise, and then exchanges heat with the medium in the first heat exchange tube 11. The first heat exchange tube 11 transfers heat to the low-pressure generator 4, heating the lithium bromide solution in the low-pressure generator 4 to generate refrigerant vapor, which is then cooled by condensation and evaporation.

[0047] After the first heat exchange, the flue gas enters the second flue gas aeration assembly 13 through the connecting pipe 1201 and the fan 1202, and then enters the second flue gas waste heat recovery box 14 through the second flue gas aeration assembly 13. It then undergoes a second heat exchange with the heat exchange medium in the second flue gas waste heat recovery box 14, which raises the temperature of the heat exchange medium in the second flue gas waste heat recovery box 14. It also exchanges heat with the domestic water in the second heat exchange tube 15 to heat the domestic water. After the second heat exchange, the flue gas is transported to other areas or processes through the discharge pipe 16.

[0048] During long-term operation, the amount of flue gas impurities contained in the heat exchange medium in the first flue gas waste heat recovery box 10 will increase. At this time, the heat exchange medium in the first flue gas waste heat recovery box 10 is transported to the cleaning box 1703 through the first heat exchange medium conveying pipeline 1701 and the conveying pump 1702. The heat exchange medium is filtered by the filter component 1704 in the cleaning box 1703 to filter out the impurities after the combustion of the flue gas in the heat exchange medium, thereby improving the heat transfer efficiency of the heat exchange medium. The filtered heat exchange medium is then transported back to the first flue gas waste heat recovery box 10 through the second heat exchange medium conveying pipeline 1706.

[0049] When the filter assembly 1704 has been running for a long time and there are a lot of impurities on its surface, the filter assembly 1704 is lifted by the lifting and moving assembly 1705 and moved and transported to the cleaning box 1801 of the filter plate assembly cleaning assembly 18. The impurities on the surface of the filter assembly 1704 are cleaned by the cleaning roller assembly 1802 and the cleaning liquid. After the filter assembly 1704 is cleaned, the filter assembly 1704 is moved back to the cleaning box 1703 by the lifting and moving assembly 1705.

[0050] In summary, this utility model provides a direct-fired absorption refrigeration device that can fully utilize the waste heat of flue gas after combustion, thereby improving resource utilization.

[0051] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A direct-fired absorption refrigeration device, characterized in that: It includes a burner, the burner is connected to a high-pressure generator and a high-temperature heat exchanger, the high-pressure generator is connected to a low-pressure generator, the low-pressure generator is connected to a condenser, the condenser is connected to an evaporator, the evaporator is connected to an absorber, the high-temperature heat exchanger is connected to a low-temperature heat exchanger and the low-pressure generator, and the low-temperature heat exchanger is connected to the absorber and the low-pressure generator. The flue gas output end of the burner is connected to a first flue gas aeration component. The first flue gas aeration component is located in the heat exchange medium of a first flue gas waste heat recovery box. The heat exchange medium of the first flue gas waste heat recovery box is provided with a first heat exchange tube connected to the low-pressure generator. The first flue gas waste heat recovery box is connected to a second flue gas aeration component through a connecting component. The second flue gas aeration component is located in the heat exchange medium of a second flue gas waste heat recovery box. The heat exchange medium of the second flue gas waste heat recovery box is provided with a second heat exchange tube connected to domestic water. The end of the second flue gas waste heat recovery box away from the connecting component is connected to an exhaust pipe. The first flue gas waste heat recovery box is also connected to a cleaning component for cleaning the heat exchange medium.

2. The direct-fired absorption refrigeration device as described in claim 1, characterized in that: Both the first flue gas aeration component and the second flue gas aeration component include an aeration pipe, and a plurality of aeration discs are arranged and installed on the aeration pipe.

3. The direct-fired absorption refrigeration device as described in claim 1, characterized in that: The connecting component includes a connecting pipe, one end of which is connected to the top of the first flue gas waste heat recovery box, and the other end is connected to the second flue gas aeration component. A fan and a check valve are also installed on the connecting pipe.

4. The direct-fired absorption refrigeration device as described in claim 1, characterized in that: The cleaning assembly includes a first heat exchange medium conveying pipe, on which a conveying pump is installed. One end of the first heat exchange medium conveying pipe is connected to the bottom of the first flue gas waste heat recovery box, and the other end is connected to the cleaning box. The cleaning box is equipped with a filter assembly, which is installed on a lifting and moving assembly. The end of the cleaning box away from the first heat exchange medium conveying pipe is connected to a second heat exchange medium conveying pipe, and the end of the second heat exchange medium conveying pipe away from the cleaning box is connected to the first flue gas waste heat recovery box.

5. The direct-fired absorption refrigeration device as described in claim 4, characterized in that: The filter assembly includes a connecting plate, and several filter plate groups are arranged and installed on the side of the connecting plate near the cleaning box. Each filter plate group consists of several layers of filter screen.

6. The direct-fired absorption refrigeration device as described in claim 5, characterized in that: The lifting and moving assembly includes a moving frame, a moving plate slidably mounted on the moving frame, a lifting motor mounted on the moving plate, and two synchronously wound lifting belts mounted on the output shaft of the lifting motor. The ends of the lifting belts away from the lifting motor pass around guide wheels mounted on the moving plate and are connected to the connecting plate. The two ends of the movable plate along the moving direction of the movable frame are respectively connected to the moving traction rope; The bottom of the movable frame away from the cleaning box is provided with a filter plate cleaning component, and a limiting block is provided on the movable frame and near the filter plate cleaning component and the cleaning box respectively.

7. A direct-fired absorption refrigeration device as described in claim 6, characterized in that: The filter plate assembly cleaning component includes a cleaning box, in which several cleaning roller groups are arranged at equal intervals. A space for cleaning the filter plate assembly is formed between two adjacent cleaning roller groups. The cleaning box also contains cleaning liquid, and the cleaning roller groups are partially immersed in the cleaning liquid.

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