Device and method for recycling and comprehensively utilizing waste heat of high-temperature industrial waste gas

Abstract

The invention relates to the technical field of industrial waste gas waste heat utilization, and particularly provides a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device and method.The device comprises an energy storage power generation mechanism, a waste gas waste heat heating mechanism, a waste gas waste heat refrigeration mechanism and a dust removal mechanism; the system solves the problems that an existing high-temperature industrial waste gas waste heat recovery system is complex and high in investment and operation and maintenance cost, and most of medium-low-temperature waste gas is prone to being wasted, the recycling efficiency of the high-temperature industrial waste gas generated by an existing metal smelting furnace is improved, waste heat is comprehensively applied to the aspects of energy storage, power generation, refrigeration, heating and the like, and the system is suitable for popularization and application. And the utilization efficiency of the waste heat is improved through stepped distribution of the waste heat of the high-temperature industrial waste gas. The energy recycling efficiency can be greatly improved, the energy consumption level in the steelmaking production process of iron and steel enterprises is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste gas waste heat utilization, and in particular to a device and method for comprehensive utilization of high-temperature industrial waste gas waste heat recovery. Background Art

[0002] In the steelmaking process, the steelmaking furnace will produce a large amount of industrial waste gas with complex components, including dust, CO, nitrogen, CO2, sulfide, etc. The temperature of the waste gas produced by the steelmaking furnace reaches 1200-1400℃, and this part of the waste gas contains a large amount of sensible heat; the current waste heat recovery technology mainly focuses on the recovery of waste heat from high-temperature waste gas, and the waste gas in the medium and low temperature sections is directly discharged after heat exchange, which is not sufficient for the recovery of waste heat from waste gas and has a relatively single purpose.

[0003] Therefore, we provide a device and method for comprehensive utilization of waste heat from high-temperature industrial waste gas to further optimize the utilization of waste heat from industrial waste gas. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The problem to be solved by the present invention is to provide a device and method for comprehensive utilization of waste heat from high-temperature industrial waste gas, so as to overcome the defects in the prior art.

[0006] (II) Technical solution

[0007] In order to solve the technical problem, the present invention provides a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device, including an energy storage power generation mechanism, a waste gas waste heat heating mechanism, a waste gas waste heat cooling mechanism and a dust removal mechanism;

[0008] The energy storage generator mechanism is connected to the exhaust gas waste heat heating mechanism through a first pipe, the exhaust gas waste heat heating mechanism is connected to the exhaust gas waste heat cooling mechanism through a second pipe, the exhaust gas waste heat cooling mechanism is connected to the dust removal mechanism through a third pipe, and the exhaust gas in the dust removal mechanism is discharged through a chimney.

[0009] Furthermore, the energy storage and power generation mechanism includes molten salt, a low-temperature molten salt tank, a high-temperature molten salt tank, a low-temperature molten salt pump, a high-temperature molten salt pump, a molten salt heat exchanger, and a power generation system; the low-temperature molten salt tank, the high-temperature molten salt tank, the low-temperature molten salt pump, the high-temperature molten salt pump, the molten salt heat exchanger, and the power generation system are connected in sequence through multiple first connecting pipes.

[0010] Furthermore, the power generation system includes a first evaporator, a superheater, a reheater, a high-temperature pressurizer, a feed water pump, a deaerator, a low-temperature pressurizer, a condensate pump, a condenser, a steam turbine, a low-pressure cylinder, and a high-pressure cylinder; the low-pressure cylinder, steam turbine, condenser, condensate pump, low-temperature pressurizer, deaerator, feed water pump, high-temperature pressurizer, first evaporator, and superheater are connected in sequence through multiple second connecting pipes; the high-pressure cylinder and the reheater, first evaporator, and superheater are connected through multiple third connecting pipes.

[0011] Furthermore, the exhaust gas waste heat heating mechanism includes a medium-temperature exhaust gas heat exchanger, a water pump, and a heat exchange device; the medium-temperature exhaust gas heat exchanger, the water pump, and the heat exchange device are connected in sequence through a plurality of fourth connecting pipes.

[0012] Furthermore, the exhaust gas waste heat refrigeration mechanism includes a high-pressure generator, a low-pressure generator, a condenser, a cooling tower, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, a generating pump, an absorption pump, an absorber, an evaporation pump, a second evaporator, and a blower; the exhaust gas waste heat refrigeration system includes a high-pressure generator, a low-pressure generator, a condenser, a cooling tower, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, a generating pump, an absorption pump, an absorber, an evaporation pump, a second evaporator, and a blower connected by multiple fifth connecting pipes.

[0013] Furthermore, the dust removal mechanism includes a bag dust collector, a desulfurization and denitrification device, a blower, and a chimney; the dust removal mechanism includes a bag dust collector, a desulfurization and denitrification device, a blower, and a chimney, which are connected in sequence through a plurality of sixth connecting pipes.

[0014] A method for using a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device comprises the following steps:

[0015] S1. The low-temperature molten salt in the low-temperature molten salt tank passes through the low-temperature molten salt pump and then enters the high-temperature molten salt tank through the molten salt heat exchanger. The low-temperature molten salt exchanges heat with the high-temperature exhaust gas above 500°C in the exhaust gas channel in the molten salt heat exchanger. After absorbing the heat of the high-temperature industrial exhaust gas, the temperature of the low-temperature molten salt increases to become a high-temperature molten salt medium, which is stored in the high-temperature molten salt tank;

[0016] S2. When the system power demand is large, the high-temperature molten salt pump extracts the high-temperature molten salt from the high-temperature molten salt tank and sends it to the low-temperature molten salt tank after passing through the superheater, the first evaporator, and the reheater. The high-temperature molten salt exchanges heat with the water and steam in the first evaporator, the superheater, and the reheater. The temperature of the high-temperature molten salt drops, and the temperature of the water and steam rises. The high-temperature and high-pressure steam enters the high-pressure cylinder, and the steam turbine converts the thermal energy of the steam into mechanical energy to drive the generator to rotate and generate electricity; then the steam enters the reheater, and after being heated again, it enters the low-pressure cylinder to drive the steam turbine to generate electricity. The steam condenses into water through the condenser and the condensate pump and enters the cycle again;

[0017] S3, the exhaust gas temperature after passing through the energy storage power generation mechanism is about 300℃ medium-temperature exhaust gas, the medium-temperature exhaust gas is heat exchanged with the water path of the exhaust gas waste heat heating mechanism through the medium-temperature exhaust gas heat exchanger, and the medium in the loop is heated according to the different requirements of the heat exchange equipment, and the heat exchange equipment can be heating equipment, air conditioning and other related heating equipment;

[0018] S4. The temperature of the waste gas through the waste heat heating mechanism is about 200℃. The waste gas exchanges heat with the solution in the high-pressure generator. The concentrated solution enters the low-pressure generator for evaporation and mixes with the low-pressure concentrated solution. It is also mixed with the dilute solution at the outlet of the solution pump of the low-temperature solution heat exchanger. The cooling water is taken away in the absorber by the absorption pump. The refrigerant vapor generated by the low-pressure generator directly enters the condenser to condense into low-temperature refrigerant. The low-temperature refrigerant is throttled and depressurized and then sent to the evaporator for low-pressure evaporation. The evaporated vapor is absorbed by the solution in the absorber, reducing the concentration of the solution to a dilute solution. At this time, the solution releases heat and cools down, and then is cooled by the blower.

[0019] S5. The waste gas recovered by the waste heat refrigeration mechanism is dedusted by a bag filter, and then the chemical substances are removed by the desulfurization and denitrification equipment, and finally discharged through the chimney by the blower.

[0020] (III) Beneficial effects

[0021] The beneficial effects of a device and method for recovering and comprehensively utilizing waste heat from high-temperature industrial waste gas provided by the present invention are as follows:

[0022] 1. The present invention uses an energy storage power generation mechanism to allow the low-temperature molten salt in the low-temperature molten salt tank to enter the high-temperature molten salt tank through a low-temperature molten salt pump and a molten salt heat exchanger. The low-temperature molten salt exchanges heat with the high-temperature industrial waste gas in the exhaust gas channel in the molten salt heat exchanger. After absorbing the heat of the high-temperature exhaust gas, the temperature of the low-temperature molten salt increases to become a high-temperature molten salt medium, which is stored in the high-temperature molten salt tank. When the system power demand is large, the high-temperature molten salt pump extracts the high-temperature molten salt from the high-temperature molten salt pump and sends it into the low-temperature molten salt tank after passing through the superheater, evaporator, and reheater. The high-temperature molten salt exchanges heat with water and steam in the evaporator, superheater, and reheater. The temperature of the high-temperature molten salt decreases, and the temperature of the water and steam increases. High-temperature and high-pressure steam enters the high-pressure cylinder, and the steam turbine converts the thermal energy of the steam into mechanical energy, driving the generator to rotate and generate electricity. The steam then enters the reheater, and after being heated again, it enters the low-pressure cylinder to drive the steam turbine to generate electricity. The steam condenses into water through the condenser and condensate pump and enters the cycle again. Using molten salt as a heat absorption and heat storage medium improves the efficiency of the waste heat recovery system.

[0023] 2. The present invention sets up a waste heat refrigeration mechanism, and the waste gas after passing through the energy storage power generation mechanism is medium-temperature waste gas. The medium-temperature waste gas exchanges heat with the water channel of the waste heat heating mechanism through the medium-temperature waste gas heat exchanger. The medium in the loop is heated up according to the different needs of the heat exchange equipment. The heat exchange equipment can be heating equipment, air conditioning and other related heating equipment; thereby effectively utilizing the waste heat of the waste gas, reflecting the energy-saving and environmental protection industrial concept.

[0024] 3. The present invention reuses the waste gas after being utilized by the waste heat heating mechanism of waste gas through the waste heat refrigeration mechanism of waste gas, and the waste gas is heat exchanged with the solution in the high-pressure generator, and the concentrated solution comes out enters the low-pressure generator and evaporates, and then mixes with the low-pressure concentrated solution, and mixes with the dilute solution passing through the outlet of the solution pump of the low-temperature solution heat exchanger, and the cooling water is taken away in the absorber by the absorption pump, and the refrigerant vapor generated by the low-pressure generator directly enters the condenser to be condensed into a low-temperature refrigerant, and the low-temperature refrigerant is throttled and reduced in pressure and then sent to the evaporator for low-pressure evaporation, and the evaporated vapor is absorbed by the solution in the absorber, so that the concentration of the solution is reduced to a dilute solution, and at this time the solution releases heat and cools down, and then is cooled by the blower; thereby achieving a refrigeration effect, making full use of the waste heat of the waste gas, and further achieving a green and environmentally friendly effect.

[0025] 4. The waste gas recovered by the waste heat refrigeration mechanism is dedusted by a bag filter, and then the chemical substances are removed by desulfurization and denitrification equipment, and finally discharged through the chimney by the blower, which reduces the impact of external environmental pollution, improves the utilization efficiency of sensible heat of industrial waste, improves the efficiency of energy recovery and utilization, reduces the energy consumption level in the production process of steelmaking furnaces in steel enterprises, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a device for recovering and comprehensively utilizing waste heat from high-temperature industrial waste gas according to the present invention;

[0028] Figure 2 A schematic diagram of an energy storage and power generation mechanism of a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device of the present invention;

[0029] Figure 3 A schematic diagram of waste gas waste heat utilization and treatment of a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device of the present invention;

[0030] The names of the components corresponding to the various reference numerals in the figure are: 1. Submerged arc furnace; 2. Low-temperature molten salt tank; 3. Low-temperature molten salt pump; 4. Molten salt heat exchanger; 5. High-temperature molten salt tank; 6. High-temperature molten salt pump; 7. Superheater; 8. First evaporator; 9. Reheater; 10. High-temperature pressurizer; 11. Feedwater pump; 12. Deaerator; 13. Low-temperature pressurizer; 14. Condensate pump; 15. Condenser; 16. Steam turbine; 17. Low-pressure cylinder; 18. High-pressure cylinder; 19. Medium-temperature Exhaust gas heat exchanger; 20. Water pump; 21. Heat exchange equipment; 22. Bag filter; 23. High-pressure generator; 24. Low-pressure generator; 25. Condenser; 26. Cooling tower; 27. Blower; 28. Second evaporator; 29. ​​Evaporation pump; 30. Absorber; 31. Absorption pump; 32. Generator pump; 33. Low-temperature solution heat exchanger; 34. High-temperature solution heat exchanger; 35. Condenser; 36. Desulfurization and denitrification equipment; 37. Blower; 38. Chimney. DETAILED DESCRIPTION

[0031] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0033] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0035] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0036] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0037] See also Figures 1 to 3 , the present invention provides a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device, including an energy storage power generation mechanism, a waste gas waste heat heating mechanism, a waste gas waste heat cooling mechanism and a dust removal mechanism;

[0038] The energy storage generator mechanism and the exhaust gas waste heat heating mechanism are connected through a first pipe, the exhaust gas waste heat heating mechanism and the exhaust gas waste heat cooling mechanism are connected through a second pipe, the exhaust gas waste heat cooling mechanism is connected to the dust removal mechanism through a third pipe, and the exhaust gas in the dust removal mechanism is discharged through the chimney 38.

[0039] The energy storage power generation mechanism includes molten salt, a low-temperature molten salt tank 2, a high-temperature molten salt tank 5, a low-temperature molten salt pump 3, a high-temperature molten salt pump 6, a molten salt heat exchanger 4, and a power generation system; the low-temperature molten salt tank 2, the high-temperature molten salt tank 5, the low-temperature molten salt pump 3, the high-temperature molten salt pump 6, the molten salt heat exchanger 4, and the power generation system are connected in sequence through multiple first connecting pipes.

[0040] The power generation system includes a first evaporator 8, a superheater 7, a reheater 9, a high-temperature pressurizer 10, a feed water pump 11, a deaerator 12, a low-temperature pressurizer 13, a condensate pump 14, a condenser 15, a steam turbine 16, a low-pressure cylinder 17, and a high-pressure cylinder 18; the low-pressure cylinder 17, the steam turbine 16, the condenser 15, the condensate pump 14, the low-temperature pressurizer 13, the deaerator 12, the feed water pump 11, the high-temperature pressurizer 10, the first evaporator 8, and the superheater 7 are connected in sequence through a plurality of second connecting pipes; the high-pressure cylinder 18 and the reheater 9, the first evaporator 8, and the superheater 7 are connected through a plurality of third connecting pipes.

[0041] The exhaust gas waste heat heating mechanism includes a medium-temperature exhaust gas heat exchanger 19, a water pump 20, and a heat exchange device 21; the medium-temperature exhaust gas heat exchanger 19, the water pump 20, and the heat exchange device 21 are connected in sequence through a plurality of fourth connecting pipes.

[0042] The exhaust gas waste heat refrigeration mechanism includes a high-pressure generator 23, a low-pressure generator 24, a condenser 25, a cooling tower 26, a high-temperature solution heat exchanger 34, a low-temperature solution heat exchanger 33, a generating pump 32, an absorption pump 31, an absorber 30, an evaporation pump 29, a second evaporator 28, and a blower 27 connected by multiple fifth connecting pipes.

[0043] The dust removal mechanism includes a bag dust collector 22, a desulfurization and denitrification device 36, a blower 37, and a chimney 38; the dust removal mechanism includes a bag dust collector 22, a desulfurization and denitrification device 36, a blower 37, and a chimney 38, which are connected in sequence through a plurality of sixth connecting pipes.

[0044] A method for using a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device comprises the following steps:

[0045] S1, the low-temperature molten salt in the low-temperature molten salt tank 2 passes through the low-temperature molten salt pump 3 and then enters the high-temperature molten salt tank 5 through the molten salt heat exchanger 4. The low-temperature molten salt exchanges heat with the high-temperature industrial waste gas above 500°C in the waste gas channel in the molten salt heat exchanger 4. After absorbing the heat of the high-temperature industrial waste gas, the temperature of the low-temperature molten salt increases to become a high-temperature molten salt medium, which is stored in the high-temperature molten salt tank 5;

[0046] S2. When the system power demand is large, the high-temperature molten salt pump 6 extracts the high-temperature molten salt from the high-temperature molten salt tank 5 and sends it to the low-temperature molten salt tank 2 after passing through the superheater 7, the first evaporator 8, and the reheater 9. The high-temperature molten salt exchanges heat with the water and steam in the first evaporator 8, the superheater 7, and the reheater 9. The temperature of the high-temperature molten salt decreases, and the temperature of the water and the steam increases. The high-temperature and high-pressure steam enters the high-pressure cylinder 18, and the steam turbine 16 converts the thermal energy of the steam into mechanical energy to drive the generator to rotate and generate electricity; then the steam enters the reheater 9, and after being heated again, it enters the low-pressure cylinder 17 to drive the steam turbine 16 to generate electricity. The steam condenses into water through the condenser 25 and the condensate pump 14 and enters the cycle again;

[0047] S3, the exhaust gas temperature after passing through the energy storage power generation mechanism is about 300°C medium-temperature exhaust gas, the medium-temperature exhaust gas passes through the medium-temperature exhaust gas heat exchanger 19 and the water path of the exhaust gas waste heat heating mechanism to exchange heat, the medium in the loop is heated up and heat is exchanged according to different requirements of the heat exchange device 21, and the heat exchange device 21 can be a heating device, air conditioner or other related heating equipment;

[0048] S4. The temperature of the waste gas through the waste heat heating mechanism is about 200°C. The waste gas is heat exchanged with the solution in the high-pressure generator 23. The concentrated solution enters the low-pressure generator 26 for evaporation and mixes with the low-pressure concentrated solution. It is also mixed with the dilute solution at the outlet of the solution pump of the low-temperature solution heat exchanger 33. The cooling water is taken away in the absorber 30 by the absorption pump 31. The refrigerant vapor generated by the low-pressure generator 24 directly enters the condenser 25 to condense into a low-temperature refrigerant. The low-temperature refrigerant is throttled and depressurized and then sent to the evaporator 28 for low-pressure evaporation. The evaporated vapor is absorbed by the solution in the absorber 30, so that the concentration of the solution is reduced to a dilute solution. At this time, the solution releases heat and cools down, and then refrigerates through the blower 27.

[0049] S5. The waste gas recovered by the waste heat refrigeration mechanism is dedusted by the bag filter 22, and then the chemical substances are removed by the desulfurization and denitrification equipment 36, and finally discharged through the chimney 38 by the blower 37.

[0050] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for comprehensive utilization of waste heat from high-temperature industrial waste gas, characterized in that: It includes energy storage power generation mechanism, exhaust gas waste heat heating mechanism, exhaust gas waste heat cooling mechanism and dust removal mechanism; The energy storage power generation mechanism is connected to the exhaust gas waste heat heating mechanism through a first pipe, the exhaust gas waste heat heating mechanism is connected to the exhaust gas waste heat cooling mechanism through a second pipe, the exhaust gas waste heat cooling mechanism is connected to the dust removal mechanism through a third pipe, and the exhaust gas in the dust removal mechanism is discharged through a chimney (38).

2. The high-temperature industrial waste gas waste heat recovery and comprehensive utilization device according to claim 1 is characterized in that: The energy storage power generation mechanism comprises molten salt, a low-temperature molten salt tank (2), a high-temperature molten salt tank (5), a low-temperature molten salt pump (3), a high-temperature molten salt pump (6), a molten salt heat exchanger (4), and a power generation system; the low-temperature molten salt tank (2), the high-temperature molten salt tank (5), the low-temperature molten salt pump (3), the high-temperature molten salt pump (6), the molten salt heat exchanger (4), and the power generation system are connected in sequence via a plurality of first connecting pipes.

3. The high-temperature industrial waste gas waste heat recovery and comprehensive utilization device as claimed in claim 2 is characterized in that: The power generation system comprises a first evaporator (8), a superheater (7), a reheater (9), a high-temperature pressurizer (10), a feed water pump (11), a deaerator (12), a low-temperature pressurizer (13), a condensate pump (14), a condenser (15), a steam turbine (16), a low-pressure cylinder (17), and a high-pressure cylinder (18); the low-pressure cylinder (17), the steam turbine (16), the condenser (15), the condensate pump (14), the low-temperature pressurizer (13), the deaerator (12), the feed water pump (11), the high-temperature pressurizer (10), the first evaporator (8), and the superheater (7) are connected in sequence through a plurality of second connecting pipes; and the high-pressure cylinder (18) and the reheater (9), the first evaporator (8), and the superheater (7) are connected through a plurality of third connecting pipes.

4. The high-temperature industrial waste gas waste heat recovery and comprehensive utilization device according to claim 1 is characterized in that: The exhaust gas waste heat heating mechanism comprises a medium-temperature exhaust gas heat exchanger (19), a water pump (20), and a heat exchange device (21); the medium-temperature exhaust gas heat exchanger (19), the water pump (20), and the heat exchange device (21) are connected in sequence via a plurality of fourth connecting pipes.

5. The high-temperature industrial waste gas waste heat recovery and comprehensive utilization device according to claim 1 is characterized in that: The waste heat refrigeration mechanism comprises a high-pressure generator (23), a low-pressure generator (24), a condenser (25), a cooling tower (26), a high-temperature solution heat exchanger (34), a low-temperature solution heat exchanger (33), a generating pump (32), an absorption pump (31), an absorber (30), an evaporation pump (29), a second evaporator (28), and a blower (27); the waste heat refrigeration system comprises a high-pressure generator (23), a low-pressure generator (24), a condenser (25), a cooling tower (26), a high-temperature solution heat exchanger (34), a low-temperature solution heat exchanger (33), a generating pump (32), an absorption pump (31), an absorber (30), an evaporation pump (29), a second evaporator (28), and a blower (27), which are connected by a plurality of fifth connecting pipes.

6. The high-temperature industrial waste gas waste heat recovery and comprehensive utilization device according to claim 1, characterized in that: The dust removal mechanism comprises a bag dust collector (22), a desulfurization and denitrification device (36), a blower (37), and a chimney (38); the dust removal mechanism comprises a bag dust collector (22), a desulfurization and denitrification device (36), a blower (37), and a chimney (38), which are connected in sequence via a plurality of sixth connecting pipes.

7. A method for using a high-temperature industrial waste gas waste heat recovery and comprehensive utilization device, applied to the high-temperature industrial waste gas waste heat recovery and comprehensive utilization device as described in any one of claims 1 to 6, characterized in that: The steps include: S1, the low-temperature molten salt in the low-temperature molten salt tank (2) passes through the low-temperature molten salt pump (3) and then enters the high-temperature molten salt tank (5) through the molten salt heat exchanger (4). The low-temperature molten salt exchanges heat with the high-temperature exhaust gas above 500° C. in the exhaust gas channel in the molten salt heat exchanger (4). After absorbing the heat of the high-temperature exhaust gas, the temperature of the low-temperature molten salt increases to become a high-temperature molten salt medium, which is stored in the high-temperature molten salt tank (5); S2. When the system power demand is large, the high-temperature molten salt pump (6) extracts the high-temperature molten salt from the high-temperature molten salt tank (5), passes through the superheater (7), the first evaporator (8), and the reheater (9), and then sends it into the low-temperature molten salt tank (2). The high-temperature molten salt exchanges heat with the water and steam in the first evaporator (8), the superheater (7), and the reheater (9). The temperature of the high-temperature molten salt decreases, while the temperature of the water and the steam increases. The high-temperature and high-pressure steam enters the high-pressure cylinder (18), and the steam turbine (16) converts the thermal energy of the steam into mechanical energy, driving the generator to rotate and generate electricity. The steam then enters the reheater (9), and after being heated again, it enters the low-pressure cylinder (17) to drive the steam turbine (16) to generate electricity. The steam condenses into water through the condenser (25) and the condensate pump (14), and enters the cycle again. S3, the exhaust gas after passing through the energy storage power generation mechanism has a medium-temperature exhaust gas temperature of about 300°C. The medium-temperature exhaust gas is heat-exchanged with the water path of the exhaust gas waste heat heating mechanism through the medium-temperature exhaust gas heat exchanger (19). The medium in the loop is heated up and heat-exchanged according to different requirements of the heat exchange device (21). The heat exchange device (21) can be a heating device, air conditioner or other related heating equipment; S4. The temperature of the waste gas generated by the waste heat heating mechanism is about 200°C. The waste gas is heat exchanged with the solution in the high-pressure generator (23). The concentrated solution is evaporated in the low-pressure generator (26) and mixed with the low-pressure concentrated solution. The concentrated solution is mixed with the dilute solution at the outlet of the solution pump of the low-temperature solution heat exchanger (33). The cooling water is taken away in the absorber (30) by the absorption pump (31). The refrigerant vapor generated by the low-pressure generator (24) directly enters the condenser (25) and is condensed into a low-temperature refrigerant. The low-temperature refrigerant is throttled and depressurized and then sent to the evaporator (28) for low-pressure evaporation. The evaporated vapor is absorbed by the solution in the absorber (30), reducing the concentration of the solution to a dilute solution. At this time, the solution releases heat and cools down, and is then cooled by the blower (27). S5. The waste gas recovered by the waste heat refrigeration mechanism is dedusted by a bag filter (22), and then the chemical substances are removed by a desulfurization and denitrification device (36), and finally discharged through a chimney (38) by a blower (37).

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