Flue gas waste heat utilization system

Abstract

The utility model relates to the technical field of combustion equipment, and discloses a flue gas waste heat utilization system, which comprises a primary combustion device, a secondary combustion device and a secondary combustion device, the inlet of the secondary combustion device is communicated with the first flue gas outlet and is provided with a second flue gas outlet; inlets of the refrigeration assembly and the heat exchange assembly are communicated with a second flue gas outlet of the secondary combustion device; and an inlet of the tail gas treatment device communicates with outlets of the refrigeration assembly and the heat exchange assembly. According to the flue gas waste heat utilization system, heat of high-temperature flue gas is converted into cold energy and heat energy which can be used, and energy waste is avoided. The problems that a traditional flue gas waste heat utilization mode is single and low in efficiency, and tail gas emission pollutes the environment are solved, efficient utilization and environment-friendly emission of flue gas waste heat are achieved, meanwhile, the comprehensive energy utilization efficiency of the whole system is improved, and good economic and environmental benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment technology, specifically to a flue gas recovery and utilization system. Background Technology

[0002] In the preparation of anode materials for new energy lithium batteries, the kiln is a key piece of production equipment. During operation, the kiln generates a large amount of flue gas, which contains various pollutants, mainly particulate matter, sulfur dioxide, nitrogen oxides, and asphalt fumes, affecting air quality, harming human respiratory health, and causing environmental pollution.

[0003] In their early stages, many enterprises, due to technological and cost limitations, failed to effectively recover and utilize the waste heat from kiln flue gas, instead directly releasing the high-temperature flue gas into the atmosphere. This not only led to serious energy waste but also caused thermal pollution to the surrounding environment, affecting the balance of the surrounding ecological environment.

[0004] As energy awareness gradually increases, some enterprises have begun to try to recover and utilize waste heat from kiln flue gas. However, due to technological limitations, they usually adopt relatively simple utilization methods. Although this saves some energy to a certain extent, the single utilization method cannot fully tap the potential of waste heat, resulting in a still low efficiency in waste heat energy utilization. Utility Model Content

[0005] In view of this, the present invention provides a flue gas waste heat utilization system to solve the problem of low utilization rate of waste heat energy generated by kiln combustion.

[0006] This utility model provides a flue gas waste heat utilization system, comprising: a primary combustion device having a first flue gas outlet; a secondary combustion device having an inlet connected to the first flue gas outlet and a second flue gas outlet; a refrigeration component and a heat exchange component, the inlets of the refrigeration component and the heat exchange component being connected to the second flue gas outlet of the secondary combustion device; and an exhaust gas treatment device having an inlet connected to the outlets of the refrigeration component and the heat exchange component.

[0007] With the above setup, the flue gas generated by the primary combustion device enters the secondary combustion device through the first flue gas outlet. The secondary combustion device further enhances the combustion efficiency of the flue gas, reducing unburned substances. The connection between the second flue gas outlet and the refrigeration and heat exchange components enables effective distribution of waste heat. The refrigeration component utilizes the waste heat from the incoming high-temperature flue gas to achieve a cooling function through its internal structure, meeting the demand for cooling and effectively utilizing waste heat energy. The heat exchange component converts the waste heat into usable heat energy such as hot water, providing convenience for related needs. The exhaust gas treatment device, connected to the outlets of the refrigeration and heat exchange components, treats the exhaust gas, reducing pollutant emissions, recovering some substances, and achieving resource reuse. This solves the problems of traditional single-method, low-efficiency flue gas waste heat utilization and environmental pollution caused by exhaust gas emissions, achieving efficient utilization of flue gas waste heat and environmentally friendly emissions.

[0008] Optionally, the secondary combustion device includes an incinerator connected to an oxygen pipeline and a gas pipeline.

[0009] Through the above setup, the oxygen pipeline provides sufficient oxygen to the incinerator, enabling the complete combustion of unburned components in the flue gas of the primary combustion unit, improving combustion efficiency, reducing pollutant emissions, and increasing the waste heat energy of the flue gas; the gas pipeline replenishes fuel, ensuring the smooth progress of secondary combustion, which is particularly effective when the waste heat energy is low or when deep treatment is required.

[0010] Optionally, the oxygen pipeline is connected to a blower outside the incinerator.

[0011] With the above setup, the blower connected to the oxygen pipeline can powerfully blow air into the incinerator to deliver sufficient oxygen. This ensures that unburned materials in the flue gas are fully mixed and reacted with oxygen during secondary combustion, which not only improves the degree of combustion and flue gas temperature and increases waste heat energy, but also reduces the generation of harmful gases and lowers the difficulty and cost of exhaust gas treatment.

[0012] Optionally, the refrigeration assembly includes a refrigeration unit, a first water tank, and a first energy-consuming group. The refrigeration unit has a first channel, a second channel, and a third channel. The inlet of the first channel is connected to the outlet of the secondary combustion device, and the outlet of the first channel is connected to the exhaust gas treatment device. The inlet and outlet of the second channel are respectively connected to the first water tank, and the inlet and outlet of the third channel are respectively connected to the first energy-consuming group.

[0013] Through the above setup, the refrigeration components construct a highly efficient waste heat refrigeration system. The first channel of the refrigeration unit introduces flue gas with a large amount of waste heat generated by the secondary combustion device; the second channel connects to the first water tank, providing a stable cooling medium for the refrigeration system; the third channel connects to the first energy-consuming group, introducing the object to be cooled into the refrigeration system to complete the refrigeration, solving the problems of high energy consumption and single waste heat utilization in traditional refrigeration, improving the overall energy utilization efficiency of the system, and enabling waste heat to be fully and diversely utilized.

[0014] Optionally, the refrigerator is a lithium bromide refrigerator, which includes a generator, a condenser, an evaporator and an absorber connected in sequence in a loop. The first channel passes through the generator, the second channel passes through the condenser and the absorber, and the third channel passes through the evaporator.

[0015] With the above configuration, the generator, condenser, evaporator, and absorber inside the lithium bromide refrigerator are sequentially connected to form a loop, creating a stable refrigeration process. The first channel runs through the generator, utilizing waste heat to promote the evaporation of water from the lithium bromide solution; the second channel runs through the condenser and absorber to ensure heat exchange and refrigeration cycle; and the third channel runs through the evaporator to transfer cooling capacity to the first energy-consuming unit for refrigeration.

[0016] Optionally, the first energy-consuming group is an air conditioning unit.

[0017] With the above setup, the first energy-consuming group is the air conditioning unit, which can effectively utilize the cooling capacity of the refrigeration components. Air conditioning units are widely used, can distribute cooling capacity on demand, improve the indoor thermal environment, reduce dependence on traditional energy sources, save costs, and are highly adaptable, easy to integrate with existing facilities, solving the problems of unclear application and loose integration of waste heat for cooling, and expanding the field of waste heat utilization.

[0018] Optionally, the heat exchange assembly includes a heat exchanger, a second water tank, and a second energy-consuming group. The heat exchanger has a fourth channel and a fifth channel. The inlet of the fourth channel is connected to the outlet of the secondary combustion device, and the outlet of the fourth channel is connected to the exhaust gas treatment device. The inlet and outlet of the fifth channel are respectively connected to the second water tank. The second water tank also has a second water outlet, and the second energy-consuming group is connected to the second water outlet of the second water tank.

[0019] Through the above setup, the fourth channel precisely introduces the waste heat from the high-temperature flue gas output by the secondary combustion unit, providing an energy source for the heat exchange process. The flue gas, after heat exchange, is then systematically transported to the exhaust gas treatment unit, ensuring the continuity of the waste heat utilization process. The fifth channel connects to the second water tank, allowing water to circulate between the heat exchanger and the tank. After being heated through heat exchange, the water flows from the second outlet to the second energy-consuming group, meeting diverse heat energy needs such as domestic hot water and industrial process heat.

[0020] Optionally, the heat exchanger is a gas-water heat exchange device, and the second energy-consuming component is a hot water supply group.

[0021] With the above setup, the heat exchanger uses a gas-water heat exchange device, and the second energy-consuming component is the hot water supply unit. Together, they achieve a highly efficient waste heat heating function. The hot water supply unit is connected to the outlet of the second water tank, effectively distributing the heated hot water to meet the hot water needs of domestic and industrial applications. This setup fully utilizes the waste heat from the flue gas, allowing the entire system to provide hot water to users more stably and efficiently, thus improving overall energy utilization efficiency.

[0022] Optionally, the flue gas waste heat utilization system further includes an exhaust gas detection device connected to the outlet of the exhaust gas treatment device. A fan is provided between the exhaust gas treatment device and the exhaust gas detection device. The exhaust gas detection device has a first outlet and a second outlet. The first outlet is connected to the atmosphere, and the second outlet is connected to the secondary combustion device.

[0023] With the above-described configuration, the exhaust gas detection device and the exhaust gas treatment device are connected at the outlet, and the design includes two outlets. This allows for accurate monitoring of exhaust gas conditions. Substandard exhaust gas can be returned to the secondary combustion device for further treatment, while compliant exhaust gas is discharged into the atmosphere. A fan between the exhaust gas treatment device and the exhaust gas detection device provides power for exhaust gas transmission, ensuring a continuous exhaust gas treatment process, making detection more accurate, and solving the problem of unstable exhaust gas transmission affecting detection and system operation. This ensures efficient and reliable system operation and compliant exhaust gas emissions.

[0024] Optionally, the exhaust gas treatment device is equipped with a stainless steel filter cartridge for filtering particulate matter in the flue gas.

[0025] With the above-described configuration, the stainless steel filter cartridge in the exhaust gas treatment device can effectively filter particulate matter in the flue gas. It precisely intercepts solid particulate impurities in the exhaust gas, preventing them from being emitted into the atmosphere and reducing environmental pollution. Simultaneously, it reduces damage to subsequent exhaust gas detection devices and other equipment caused by particulate matter, ensuring the stable operation of the entire system. This solves the problems of environmental pollution and equipment damage caused by exhaust gas particulate matter, and improves the environmental friendliness and reliability of the flue gas waste heat utilization system. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1This is a connection diagram of a flue gas waste heat utilization system provided in an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of a chiller in a flue gas waste heat utilization system provided in an embodiment of the present invention.

[0029] Figure 3 This is a flowchart of a flue gas waste heat utilization system provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Primary combustion device; 2. Exhaust gas treatment device; 3. Incinerator; 4. Oxygen pipeline; 5. Gas pipeline; 6. Blower; 7. Refrigeration unit; 8. First water tank; 9. First energy consumption group; 10. First channel; 11. Second channel; 12. Third channel; 13. Generator; 14. Condenser; 15. Evaporator; 16. Absorber; 17. Heat exchanger; 18. Second water tank; 19. Second energy consumption group; 20. Exhaust gas detection device; 21. Fan. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0034] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment, including: a primary combustion device 1, a secondary combustion device, a refrigeration component, a heating component, and a tail gas treatment device.

[0035] Specifically, the primary combustion device 1 has a first flue gas outlet; the inlet is connected to the first flue gas outlet, the inlet of the secondary combustion device is connected to the first flue gas outlet, and the secondary combustion device has a second flue gas outlet; the inlets of the refrigeration component and the heat exchange component are connected to the second flue gas outlet of the secondary combustion device; and the inlet of the exhaust gas treatment device is connected to the outlets of the refrigeration component and the heat exchange component.

[0036] In this embodiment, the various components of the flue gas waste heat utilization system work closely together to form a highly efficient and environmentally friendly whole. The flue gas generated by the primary combustion device 1 enters the secondary combustion device through the first flue gas outlet. The secondary combustion device further processes the flue gas, fully burning any unreacted substances and improving energy utilization. The second flue gas outlet provides high-temperature flue gas to the refrigeration and heat exchange components. The refrigeration component utilizes the waste heat of the high-temperature flue gas to achieve a cooling function, meeting specific cooling needs. The heat exchange component converts the heat from the high-temperature flue gas into usable thermal energy for heating, effectively utilizing the waste heat of the flue gas and avoiding energy waste. The exhaust gas treatment device treats the exhaust gas after refrigeration and heat exchange, removing any potentially harmful substances and impurities to ensure that exhaust emissions meet environmental standards. This solves the environmental pollution problems that may arise from traditional flue gas emissions and also improves the overall energy utilization efficiency of the entire system, resulting in good economic and environmental benefits.

[0037] It should be noted that this embodiment does not limit the first combustion device. In small-scale industrial production or commercial settings, an oil burner can be selected as the first combustion device, as it features high combustion efficiency, rapid start-up, and relatively simple operation, and can meet heating or energy conversion needs within a certain range. However, in large-scale thermal power plants or industrial complexes, coal-fired kilns may be a more suitable option for the first combustion device. Although these devices are large in size and complex to operate and manage, their powerful fuel processing capacity and high energy output can support large-scale power generation and industrial steam supply tasks.

[0038] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The secondary combustion device includes an incinerator 3, and the incinerator 3 is connected to an oxygen pipeline 4 and a gas pipeline 5.

[0039] Specifically, oxygen pipeline 4 introduces sufficient oxygen into incinerator 3, allowing unburned components in the flue gas entering incinerator 3 from primary combustion device 1 to undergo further combustion in an oxygen-rich environment. This significantly improves combustion efficiency, reduces combustible residues in the flue gas, and increases the flue gas temperature. Gas pipeline 5 is responsible for supplementing incinerator 3 with gas, especially when the flue gas energy generated by primary combustion device 1 is insufficient or when enhanced secondary combustion is required. This gas supplementation ensures continuous and stable combustion within incinerator 3, ensuring more thorough decomposition of harmful substances in the flue gas. This provides better flue gas conditions for subsequent waste heat utilization and also helps reduce pollutant content in the exhaust gas, improving the overall environmental performance of the system.

[0040] like Figure 1As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The oxygen pipeline 4 is connected to a blower 6 outside the incinerator 3.

[0041] Specifically, the blower 6 generates a powerful airflow, propelling a large volume of air rapidly through the oxygen pipe 4 into the incinerator 3. This ensures a sufficient oxygen supply within the incinerator 3, allowing the remaining combustible components in the flue gas after the first combustion to burn more completely in an oxygen-rich environment. A sufficient oxygen supply effectively improves combustion efficiency, converting more chemical energy into heat energy, thereby increasing the temperature and energy density of the flue gas. This not only helps to obtain more energy in subsequent waste heat recovery stages but also further reduces pollutants generated by incomplete combustion, optimizing the performance and environmental protection level of the entire flue gas waste heat recovery system.

[0042] like Figure 2 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The refrigeration component includes a refrigeration unit 7, a first water tank 8, and a first energy-consuming group 9. The refrigeration unit 7 has a first channel 10, a second channel 11, and a third channel 12. The inlet of the first channel 10 is connected to the outlet of the secondary combustion device, and the outlet of the first channel 10 is connected to the exhaust gas treatment device. The inlet and outlet of the second channel 11 are respectively connected to the first water tank 8, and the inlet and outlet of the third channel 12 are respectively connected to the first energy-consuming group 9.

[0043] Specifically, the first channel 10 inside the refrigerator 7 introduces the waste heat from the high-temperature flue gas output from the secondary combustion device into the refrigerator 7, providing driving force for the refrigeration cycle. The exhaust gas, after heat exchange, is then directed to the exhaust gas treatment device. The second channel 11 is connected to the first water tank 8, forming a water circulation loop. As the water in the tank flows through the channels, it absorbs or releases heat, thereby stabilizing the heat exchange environment within the refrigerator 7 and ensuring the efficient and stable operation of the refrigeration process. The third channel 12 transfers the cooling capacity generated by the refrigerator 7 to the first energy-consuming group 9. The first energy-consuming group 9 can be applied to scenarios such as cooling in industrial production workshops and air conditioning in commercial venues, meeting the cooling needs of specific areas and avoiding the waste of waste heat.

[0044] like Figure 2 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The chiller 7 is a lithium bromide chiller. The lithium bromide chiller includes a generator 13, a condenser 14, an evaporator 15 and an absorber 16 connected in sequence in a loop. The first channel 10 passes through the generator 13, the second channel 11 passes through the condenser 14 and the absorber 16, and the third channel 12 passes through the evaporator 15.

[0045] Specifically, the first channel 10 runs through the generator 13, allowing the high-temperature flue gas waste heat from the secondary combustion device to cause the dilute lithium bromide solution to evaporate within the generator 13, with the separated water vapor entering the condenser 14. The second channel 11 runs through the condenser 14 and the absorber 16. In the condenser 14, the water vapor releases heat and condenses upon cooling, while the water in the second channel 11 carries away heat to maintain a low-temperature environment, and the condensate flows into the evaporator 15. In the absorber 16, the concentrated lithium bromide solution absorbs the water vapor from the evaporator 15, turning back into a dilute solution, which is then circulated back to the generator 13. During this process, the water flow in the second channel 11 assists in heat exchange. The third channel 12 runs through the evaporator 15, where liquid water evaporates under low pressure, absorbing heat to generate cooling capacity, which is then transferred to the first energy-consuming group 9 via the third channel 12, achieving refrigeration. The lithium bromide refrigerator efficiently utilizes the waste heat from the flue gas, providing stable and environmentally friendly refrigeration, thus improving the system's energy efficiency and practicality.

[0046] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment, wherein the first energy-consuming group 9 is an air conditioning unit.

[0047] Specifically, the first energy-consuming group 9 is designated as an air conditioning unit, allowing for highly efficient utilization of the cooling capacity generated by the lithium bromide chiller. Once the lithium bromide chiller transfers cooling capacity to the air conditioning unit via the third channel 12, the air conditioning unit can precisely distribute the cooling capacity to each room and area requiring cooling based on pre-set temperature parameters. This fully utilizes the cooling capacity converted from waste heat in the flue gas, reduces reliance on traditional electricity and other energy sources, lowers cooling costs, and enhances the system's practicality and economy.

[0048] In other embodiments, the first energy-consuming group 9 can be replaced with other systems according to actual needs. For example, with the rapid development of information technology, the scale and density of data centers are constantly increasing, and their equipment operation generates a large amount of heat, requiring extremely high heat dissipation and cooling. As the first energy-consuming group 9, the data center cooling device can utilize the cooling capacity of the lithium bromide refrigerator to ensure the stable operation of the data center and data security.

[0049] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The heat exchange component includes a heat exchanger 17, a second water tank 18, and a second energy-consuming group 19. The heat exchanger 17 has a fourth channel and a fifth channel. The inlet of the fourth channel is connected to the outlet of the secondary combustion device, and the outlet of the fourth channel is connected to the exhaust gas treatment device. The inlet and outlet of the fifth channel are respectively connected to the second water tank 18. The second water tank 18 also has a second water outlet. The second energy-consuming group 19 is connected to the second water outlet of the second water tank 18.

[0050] Specifically, the fourth channel of heat exchanger 17 introduces the high-temperature flue gas generated by the secondary combustion device, using the waste heat of the flue gas to raise the temperature of its internal medium, completing heat exchange before the exhaust gas is discharged to the exhaust gas treatment device. The fifth channel connects to the second water tank 18, establishing a stable water circulation system. Water circulates between the fifth channel and the water tank, fully absorbing heat from the heat exchanger 17, causing the water temperature in the tank to gradually rise. The second outlet of the second water tank 18 is connected to the second energy-consuming group 19, from which the heated hot water flows to the second energy-consuming group 19, meeting diverse heating needs and improving the overall energy utilization efficiency of the system.

[0051] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The heat exchanger 17 is a gas-water heat exchange device, and the second energy-consuming group 19 is a hot water supply group.

[0052] Specifically, the fourth channel of the gas-water heat exchanger introduces high-temperature flue gas from the secondary combustion unit. After internal gas-water heat exchange, the exhaust gas is sent to the treatment unit. The fifth channel connects to the second water tank 18 to ensure hot water circulation and heating. The outlet of the second water tank 18 connects to the hot water supply group to stably supply hot water to canteens, dormitories, and restrooms, making full use of waste heat, improving energy efficiency, and meeting heating demands.

[0053] In other embodiments, the second energy-consuming group 19 can also be replaced with other systems, such as an industrial drying system, depending on actual needs. In many industrial production processes, such as papermaking, printing and dyeing, and ceramic firing, the drying process is crucial and consumes a great deal of energy. Taking the papermaking industry as an example, paper contains a large amount of moisture after papermaking and needs to be dried to become a qualified product. In this case, if the second energy-consuming group 19 adopts an industrial drying system, it can fully utilize the heat from the hot water provided by the heat exchange components to quickly evaporate and remove the moisture from the paper through hot air circulation or heat conduction.

[0054] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. It also includes an exhaust gas detection device 20, which is connected to the outlet of the exhaust gas treatment device 2. A fan 21 is provided between the exhaust gas treatment device 2 and the exhaust gas detection device 20. The exhaust gas detection device 20 has a first outlet and a second outlet. The first outlet is connected to the atmosphere, and the second outlet is connected to the secondary combustion device.

[0055] Specifically, the exhaust gas detection device 20 further monitors the treated exhaust gas and controls valves to ensure that compliant exhaust gas is discharged into the atmosphere through its first outlet. If the exhaust gas fails to meet standards, it can be returned to the secondary combustion device for further treatment through the second outlet, forming a closed-loop control system that effectively ensures the environmental friendliness of the system during operation. The fan 21 provides stable power support for the transmission of exhaust gas. After treatment by the exhaust gas treatment device 2, the exhaust gas flows smoothly and quickly to the exhaust gas detection device 20 under the drive of the fan 21. This ensures the continuity and stability of exhaust gas transmission, enabling the entire system to operate more efficiently and reliably in the exhaust gas treatment and detection stages.

[0056] like Figure 1 As shown, this is a specific implementation of the flue gas waste heat utilization system provided in this embodiment. The exhaust gas treatment device is equipped with a stainless steel filter cartridge for filtering particulate matter in the flue gas.

[0057] Specifically, the stainless steel filter cartridge in the exhaust gas treatment device, with its precise structure and excellent material properties, accurately intercepts particulate matter in the exhaust gas. This reduces the concentration of particulate matter in the exhaust gas, alleviates air pollution, and prevents particles from depositing and adhering in subsequent equipment, thus preventing interference with detection and damage to equipment. It solves the problems of exhaust gas particulate pollution and equipment damage, enhancing the system's environmental friendliness and reliability.

[0058] like Figure 3 The diagram shown is a flowchart of a specific implementation of the flue gas waste heat utilization system provided in this embodiment:

[0059] The flue gas generated by the primary combustion device 1 enters the secondary combustion device through the first flue gas outlet. The incinerator 3, supplemented with fuel gas and oxygen by the oxygen pipeline 4 and the gas pipeline 5, further enhances the combustion of the flue gas, increasing its temperature and energy. The combusted flue gas then flows out through the second flue gas outlet. Subsequently, the high-temperature flue gas flows into the refrigeration component and the heat exchange component. In the refrigeration component, the flue gas enters through the first channel 10 of the refrigerator 7. The lithium bromide refrigerator (composed of a circuit of generator 13, condenser 14, evaporator 15, and absorber 16) utilizes the waste heat of the flue gas to evaporate a dilute lithium bromide solution within the generator 13, producing a cooling effect. The cooling energy is transferred to the first energy-consuming group 9 through the third channel 12. The second channel 11 exchanges heat with the first water tank 8 to assist the refrigeration cycle. Finally, the exhaust gas enters the exhaust gas treatment device through the outlet of the first channel 10. In the heat exchange assembly, the flue gas exchanges heat with water in the fourth and fifth channels of the heat exchanger 17. The heated water circulates in the second water tank 18, and some of the hot water flows from the second outlet to the second energy-consuming group 19. The exhaust gas after heat exchange also enters the exhaust gas treatment device. The exhaust gas treatment device first filters particulate matter through a stainless steel filter cartridge, and then conveys it to the exhaust gas detection device 20 by a fan. The exhaust gas that meets the standards is discharged into the atmosphere from the first outlet of the exhaust gas detection device 20. If it does not meet the standards, it flows back to the secondary combustion device from the second outlet for further treatment, thereby realizing the effective utilization of flue gas waste heat, environmental protection treatment, and stable operation of the system.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. A flue gas waste heat recovery system, characterized in that, include: A primary combustion device (1) has a first flue gas outlet; A secondary combustion device, the inlet of which is connected to the first flue gas outlet, and the secondary combustion device having a second flue gas outlet; A refrigeration component and a heat exchange component, wherein the inlets of the refrigeration component and the heat exchange component are connected to the second flue gas outlet of the secondary combustion device; The exhaust gas treatment device (2) has its inlet connected to the outlet of the refrigeration component and the heat exchange component.

2. The flue gas waste heat utilization system according to claim 1, characterized in that, The secondary combustion device includes an incinerator (3), which is connected to an oxygen pipeline (4) and a gas pipeline (5).

3. The flue gas waste heat utilization system according to claim 2, characterized in that, The oxygen pipeline (4) is connected to a blower (6) outside the incinerator (3).

4. The flue gas waste heat utilization system according to claim 1, characterized in that, The refrigeration assembly includes a refrigeration unit (7), a first water tank (8), and a first energy-consuming group (9). The refrigeration unit (7) has a first channel (10), a second channel (11), and a third channel (12). The inlet of the first channel (10) is connected to the outlet of the secondary combustion device, and the outlet of the first channel (10) is connected to the exhaust gas treatment device (2). The inlet and outlet of the second channel (11) are respectively connected to the first water tank (8), and the inlet and outlet of the third channel (12) are respectively connected to the first energy-consuming group (9).

5. The flue gas waste heat utilization system according to claim 4, characterized in that, The refrigerator (7) is a lithium bromide refrigerator, which includes a generator (13), a condenser (14), an evaporator (15) and an absorber (16) connected in sequence in a loop. The first channel (10) passes through the generator (13), the second channel (11) passes through the condenser (14) and the absorber (16), and the third channel (12) passes through the evaporator (15).

6. The flue gas waste heat utilization system according to claim 5, characterized in that, The first energy-consuming group (9) is an air conditioning unit.

7. The flue gas waste heat utilization system according to claim 1, characterized in that, The heat exchange assembly includes a heat exchanger (17), a second water tank (18), and a second energy-consuming group (19). The heat exchanger (17) has a fourth channel and a fifth channel. The inlet of the fourth channel is connected to the outlet of the secondary combustion device, and the outlet of the fourth channel is connected to the exhaust gas treatment device (2). The inlet and outlet of the fifth channel are respectively connected to the second water tank (18). The second water tank (18) also has a second water outlet. The second energy-consuming group (19) is connected to the second water outlet of the second water tank (18).

8. The flue gas waste heat utilization system according to claim 7, characterized in that, The heat exchanger (17) is a gas-water heat exchange device, and the second energy-consuming group (19) is a hot water supply group.

9. The flue gas waste heat utilization system according to any one of claims 1-8, characterized in that, It also includes an exhaust gas detection device (20) connected to the outlet of the exhaust gas treatment device (2), and a fan (21) is provided between the exhaust gas treatment device (2) and the exhaust gas detection device (20). The exhaust gas detection device (20) has a first outlet and a second outlet. The first outlet is connected to the atmosphere, and the second outlet is connected to the secondary combustion device.

10. The flue gas waste heat recovery system according to any one of claims 1-8, characterized in that, The exhaust gas treatment device (2) is equipped with a stainless steel filter cartridge for filtering particulate matter in the flue gas.

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