Non-methane total hydrocarbon control and condensate recovery method for propane dehydrogenation device

Abstract

The invention relates to the technical field of propane dehydrogenation environmental protection and energy conservation, and discloses a propane dehydrogenation device non-methane total hydrocarbon control and condensate recovery method, which comprises a waste heat boiler and an air compressor, the outer surface of the waste heat boiler is provided with a waste gas discharge pipe, and the outer surface of the waste heat boiler is provided with an online analyzer and a sampler. And a preheated air connecting pipe is arranged on the outer surface of the waste heat boiler. According to the propane dehydrogenation device non-methane total hydrocarbon control and condensate recovery method, steam (water) in vacuumizing waste gas is recovered, water discharge is reduced, condensed condensate water can be recycled, the energy-saving and carbon-reducing effects are achieved, vacuumizing waste gas heat is recycled, cold-state media such as air / water can be heated, fossil fuel combustion and discharge are reduced, and the energy-saving and carbon-reducing effects are achieved. The vacuum exhaust gas can be prevented from containing a large amount of water vapor, so that the non-methane total hydrocarbon catalyst is easily inactivated by water vapor toxicants, and the loss of effective active metals caused by high-temperature scouring of the water vapor can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of propane dehydrogenation environmental protection and energy saving, and in particular to a method for controlling total non-methane hydrocarbons and recovering condensate in a propane dehydrogenation device. Background Art

[0002] Propane dehydrogenation is a key process in the production of propylene. With the continued growth in global demand for propylene, the scale and number of propane dehydrogenation units are also increasing. As a basic chemical raw material, propylene is widely used in the production of many chemical products such as plastics, synthetic fibers, and rubber. Its quality and output are crucial to the stable operation of the chemical industry chain. The regeneration waste gas and vacuum gas of Lummus' propane dehydrogenation unit contain a large amount of non-methane hydrocarbons. Before 2018, the industry generally adopted the method of directly discharging the waste gas after SCR denitrification treatment. Later, in response to national environmental protection policies, a non-methane hydrocarbon treatment catalyst was added to the waste heat boiler to remove non-methane hydrocarbons in the regeneration waste gas and vacuum gas, and then the waste gas was directly discharged into the atmosphere after SCR denitrification treatment.

[0003] The current method for removing non-methane hydrocarbons in propane dehydrogenation units is to mix the regenerated waste air with the vacuum gas and then directly enter the waste heat boiler non-methane hydrocarbon catalyst bed to remove volatile organic compounds. Since the vacuum exhaust gas contains a large amount of water vapor, the non-methane hydrocarbon catalyst is easily deactivated by water vapor poisons, and the high temperature erosion of water vapor leads to the loss of effective active metals. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for controlling total non-methane hydrocarbons and recovering condensate in a propane dehydrogenation device, which can effectively solve the problems in the prior art.

[0005] The technical solution adopted by the present invention is: a propane dehydrogenation device, comprising a waste heat boiler and an air compressor, the waste heat boiler outlet is provided with a waste gas discharge pipe, the waste heat boiler de-catalyst is provided in front of an online analyzer and a sampler, the outer surface of the waste heat boiler is provided with a preheated air connecting pipe, the other end of the preheated air connecting pipe is provided with an air heating furnace, the air heating furnace outlet is provided with a heated air connecting pipe, the heated air connecting pipe is provided with a reactor at the other end away from the air heating furnace, the reactor outlet is provided with a connecting pipe 1, the other end of the connecting pipe 1 is provided with a vacuum pump, the vacuum pump outlet is provided with a heat exchange connecting pipe, the heat exchange connecting pipe is provided with a heat exchanger assembly at the other end away from the vacuum pump, the heat exchanger assembly outlet is provided with a connecting pipe 2, the other end of the connecting pipe 2 is provided with a diversion tank assembly, the other end of the diversion tank assembly is provided with a connecting pipe 3 at the bottom of the other end, and the other end of the connecting pipe 3 away from the diversion tank assembly is provided with a pump body.

[0006] Preferably, the air compressor outlet is provided with an air connecting pipe 1, the outlet of the air connecting pipe 1 is provided with an air connecting pipe 2, and the top outlet of the diversion tank assembly is provided with a connecting pipe 4 that communicates with the waste heat boiler.

[0007] Through the above technical solution, after preheating, the air enters the air heating furnace through the preheating air connecting pipe, providing sufficient oxygen for combustion, so that the fuel is fully burned, improving the thermal efficiency of the air heating furnace, and reducing the emission of pollutants in the exhaust gas. The other part of the air enters the heat exchanger assembly through the air connecting pipe 2, participates in the heat exchange process, helps regulate the temperature, optimizes the heat exchange effect, and improves the energy utilization rate of the entire device.

[0008] Preferably, the air compressor is communicated with the waste heat boiler via air connecting pipe 1, and the air connecting pipe 2 is communicated with the heat exchanger assembly.

[0009] Through the above technical solution, air connecting pipe 2 transports another air path to the heat exchanger assembly, where heat is exchanged with other media in the heat exchanger. The temperature is adjusted according to process requirements, which helps to optimize reaction conditions and improve product quality. The dual-channel air supply design enables the air compressor to fully play its role and improves air utilization efficiency.

[0010] Preferably, the heat exchanger assembly includes a heat exchange tank, a connecting seat and a connecting column are fixedly installed on the outer surface of the heat exchange tank, a connecting frame is fixedly installed on the inner surface of the heat exchange tank, and a heat exchange tube and a column frame are fixedly installed on the inner surface of the heat exchange tank.

[0011] Through the above technical solution, the partition frame divides the interior of the heat exchange tank into different areas, guiding the flow of the medium to make its distribution more uniform, avoiding local overheating or overcooling, improving heat exchange efficiency and uniformity, and improving the stability and reliability of the heat exchanger components, reducing the risk of equipment failure, and extending the service life of the equipment. At the same time, the efficient heat exchange performance helps to reduce energy consumption and improve the energy utilization rate of the entire propane dehydrogenation unit.

[0012] Preferably, the diverter tank assembly includes a diverter tank body, a mounting frame is fixedly installed on the inner surface of the diverter tank body, a blade-type demister and a baffle are fixedly installed on the inner surface of the mounting frame, and a vortex breaker is fixedly installed on the bottom of the diverter tank body.

[0013] Through the above technical solution, after the gas enters the diversion tank body, it will first encounter the baffle, which changes the flow direction of the gas and reduces its flow rate. Some droplets hit the baffle surface under the action of inertia and are separated. Then the gas passes through the blade demister in the installation frame. The blade demister uses centrifugal force and collision principle to further capture and separate tiny droplets in the gas, which can effectively remove liquid foam in the gas, improve the safety and stability of subsequent processes, prevent liquid foam from entering the pump body and other equipment to cause damage, extend the service life of the equipment, reduce equipment maintenance costs, and prevent liquid water from causing cavitation in the machine pump and damaging the machine pump.

[0014] Preferably, three of the installation frames and blade-type demisters are provided, and the three installation frames and blade-type demisters are equidistantly distributed.

[0015] Through the above technical solution, the three equally spaced blade demisters can better adapt to the gas processing requirements of different flow rates and operating conditions, improve the adaptability and reliability of the diverter tank assembly, ensure the stable operation of the propane dehydrogenation unit under various conditions, and reduce equipment failures and production interruptions caused by liquid foam problems.

[0016] Preferably, a regeneration waste gas pipe is provided at the bottom of the reactor, and the other end of the regeneration waste gas pipe away from the reactor is connected to the connecting pipe.

[0017] Through the above technical solution and the design of the regeneration exhaust gas pipe, the hot air after heat exchange in the heat exchanger assembly can be mixed with the hot air after heat exchange in the waste heat boiler, and then enter the air heating furnace through the preheating air connecting pipe to be heated to the high temperature of the reactor.

[0018] A method for controlling total non-methane hydrocarbons and recovering condensate used in a propane dehydrogenation device comprises the following steps:

[0019] S1: The air and reducing gas mixture in the reactor is extracted by the vacuum pump and enters the heat exchanger assembly through the heat exchange connecting pipe, and is cooled by the cold air sent by the air compressor through the air connecting pipe 2.

[0020] S2: The gas entering the diversion tank assembly is first blocked and slowed down by the baffle, so that some droplets hit the baffle and separate. Then, the blade-type demister uses centrifugal force and collision principle to further separate the tiny droplets. The bottom vortex breaker prevents the liquid from being discharged and forming a vortex, ensuring smooth discharge and achieving gas-liquid separation.

[0021] S3: The condensed liquid water is pumped through the pump body and the connecting pipe 3 to the downstream for utilization, completing the condensate recovery.

[0022] S4: The vacuum non-condensable gas separated from the diversion tank assembly enters the front end of the waste heat boiler through the connecting pipe 4, and after mixing with the regenerated waste gas, it enters the non-methane total hydrocarbon catalyst bed to remove volatile organic compounds and the selective catalytic reduction bed to remove NOx and other polluting gases in turn. Finally, it is discharged into the atmosphere through the exhaust gas discharge pipe and the chimney, thereby achieving non-methane total hydrocarbon control and pollutant gas removal.

[0023] S5: The hot air after heat exchange in the heat exchanger assembly is mixed with the hot air after heat exchange in the waste heat boiler, and then enters the air heating furnace through the preheating air connecting pipe to be heated to the high temperature of the reactor, and then returns to the reactor through the heated air connecting pipe to realize the recycling of hot air.

[0024] S6: At the same time, the cooling water sent from the connecting pipe 2 can also be used to recover heat for cooling the circulating water and desalted water. The cooled gas enters the diversion tank assembly through the connecting pipe 2, and the hot water after heat exchange in the heat exchanger assembly enters the downstream of the device through the connecting pipe, reducing the downstream heat input and realizing heat recovery and utilization.

[0025] Compared with the prior art, the present invention provides a method for controlling total non-methane hydrocarbons and recovering condensate in a propane dehydrogenation unit, which has the following beneficial effects:

[0026] 1. A method for controlling non-methane total hydrocarbons and recovering condensate in a propane dehydrogenation unit recovers steam (water) from vacuum exhaust gas, reducing water emissions. The condensed water can be recycled to achieve energy conservation and carbon reduction. Heat from the vacuum exhaust gas is recycled to heat cold media such as air and water, reducing fossil fuel combustion and emissions. This method can prevent the vacuum exhaust gas from containing a large amount of water vapor, which could cause the non-methane total hydrocarbon catalyst to be easily deactivated by water vapor poisons, and prevent the high-temperature erosion of water vapor from causing loss of effective active metals.

[0027] 2. This method for controlling total non-methane hydrocarbons and recovering condensate in a propane dehydrogenation unit uses centrifugal force and collision principles to further capture and separate tiny droplets in the gas. This can effectively remove liquid foam from the gas, improve the safety and stability of subsequent processes, prevent liquid foam from entering the pump body and other equipment and causing damage, extend the service life of the equipment, and reduce equipment maintenance costs. Furthermore, the vortex breaker prevents liquid water from causing cavitation and damage to the pump.

[0028] 3. This method for controlling total non-methane hydrocarbons and recovering condensate in a propane dehydrogenation unit includes three equally spaced blade demisters that can better adapt to gas processing requirements of different flow rates and operating conditions, improve the adaptability and reliability of the diversion tank assembly, ensure the stable operation of the propane dehydrogenation unit under various conditions, and reduce equipment failures and production interruptions caused by liquid foam problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0031] Figure 3 Schematic diagram of the three-dimensional structure of the present invention Figure 3 ;

[0032] Figure 4 This is a schematic diagram of the split structure of the diverter tank assembly of the present invention;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the diverter tank assembly of the present invention;

[0034] Figure 6 Schematic diagram of the three-dimensional structure of the heat exchanger assembly of the present invention;

[0035] Figure 7 This is a schematic diagram of the disassembled structure of the heat exchanger assembly of the present invention;

[0036] Figure 8 This is a schematic diagram of the water cooling process structure of the present invention;

[0037] Figure 9 This is a structural schematic diagram of the air cooling process of the present invention.

[0038] Among them: 1. Waste heat boiler; 2. Exhaust gas discharge pipe; 3. Online analyzer; 4. Sampler; 5. Preheated air connecting pipe; 6. Air heating furnace; 7. Heated air connecting pipe; 8. Reactor; 9. Connecting pipe 1; 10. Vacuum pump; 11. Heat exchange connecting pipe; 12. Heat exchanger assembly; 1201. Heat exchange tank; 1202. Connecting seat; 1203. Connecting column; 1204. Connecting frame; 1205. Heat exchange pipe; 1206. Column frame; 13. Connecting pipe 2; 14. Diverter tank assembly; 1401. Diverter tank body; 1402. Mounting frame; 1403. Blade demister; 1404. Baffle; 1405. Vortex breaker; 15. Connecting pipe 3; 16. Pump body; 17. Air compressor; 18. Air connecting pipe 1; 19. Air connecting pipe 2; 20. Connecting pipe 4; 21. Regeneration exhaust gas pipe. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example 1: Figure 1-9 As shown, the present invention provides a method for controlling non-methane total hydrocarbons and recovering condensate in a propane dehydrogenation device, comprising a waste heat boiler 1 and an air compressor 17, wherein the outlet of the waste heat boiler 1 is provided with an exhaust gas discharge pipe 2, an online analyzer 3 and a sampler 4 are provided in front of the waste heat boiler 1 for removing non-methane catalysts, a preheated air connecting pipe 5 is provided on the outer surface of the waste heat boiler 1, an air heating furnace 6 is provided at the other end of the preheated air connecting pipe 5, a heated air connecting pipe 7 is provided at the outlet of the air heating furnace 6, and a reaction gas is provided at the other end of the heated air connecting pipe 7 away from the air heating furnace 6. Reactor 8, the outlet of reactor 8 is provided with connecting pipe 19, the other end of connecting pipe 19 is provided with a vacuum pump 10, the outlet of vacuum pump 10 is provided with a heat exchange connecting pipe 11, the other end of heat exchange connecting pipe 11 away from the vacuum pump 10 is provided with a heat exchanger assembly 12, the outlet of heat exchanger assembly 12 is provided with connecting pipe 2 13, the other end of connecting pipe 2 13 is provided with a diverter tank assembly 14, the other end of diverter tank assembly 14 is provided with connecting pipe 3 15 at the bottom, and the other end of connecting pipe 3 15 away from the diverter tank assembly 14 is provided with a pump body 16.

[0041] Specifically, an air connecting pipe 18 is provided at the outlet of the air compressor 17, an air connecting pipe 2 19 is provided at the outlet of the air connecting pipe 18, and a connecting pipe 4 20 is provided at the top outlet of the diversion tank assembly 14 to communicate with the waste heat boiler 1. The advantage is that after preheating, the air enters the air heating furnace 6 through the preheating air connecting pipe 5, providing sufficient oxygen for combustion, so that the fuel can be fully burned, improving the thermal efficiency of the air heating furnace 6, and reducing the emission of pollutants in the exhaust gas; another part of the air enters the heat exchanger assembly 12 through the air connecting pipe 2 19, participates in the heat exchange process, helps regulate the temperature, optimizes the heat exchange effect, and improves the energy utilization rate of the entire device.

[0042] Specifically, the air compressor 17 is interconnected with the waste heat boiler 1 through the air connecting pipe 1 18, and the air connecting pipe 2 19 is interconnected with the heat exchanger assembly 12. The advantage is that the air connecting pipe 2 19 transports another path of air to the heat exchanger assembly 12, exchanges heat with other media in the heat exchanger, and adjusts the temperature according to process requirements, which helps to optimize the reaction conditions and improve product quality. The dual-channel air supply design enables the air compressor 17 to play its full role and improves the air utilization efficiency.

[0043] Example 2: Figure 2-9 As shown, it is an improvement to the previous embodiment.

[0044] Specifically, the heat exchanger assembly 12 includes a heat exchange tank 1201, a connecting seat 1202 and a connecting column 1203 are fixedly installed on the outer surface of the heat exchange tank 1201, a connecting frame 1204 is fixedly installed on the inner surface of the heat exchange tank 1201, and a heat exchange tube 1205 and a partition frame 1206 are fixedly installed on the inner surface of the heat exchange tank 1201. The advantage is that the partition frame 1206 divides the interior of the heat exchange tank 1201 into different areas, guides the flow direction of the medium, makes its distribution more uniform, avoids local overheating or overcooling, improves heat exchange efficiency and uniformity, improves the stability and reliability of the heat exchanger assembly 12, reduces the risk of equipment failure, and extends the service life of the equipment; at the same time, the efficient heat exchange performance helps to reduce energy consumption and improve the energy utilization rate of the entire propane dehydrogenation device.

[0045] Specifically, the diverter tank assembly 14 includes a diverter tank body 1401, a mounting frame 1402 is fixedly installed on the inner surface of the diverter tank body 1401, a blade-type demister 1403 and a baffle 1404 are fixedly installed on the inner surface of the mounting frame 1402, and a vortex breaker 1405 is fixedly installed at the bottom of the diverter tank body 1401. The advantage is that after the gas enters the diverter tank body 1401, it will first encounter the baffle 1404, which changes the flow direction of the gas and reduces its flow rate. Some droplets hit the baffle under the action of inertia. 1404 and is separated, and then the gas passes through the blade demister 1403 in the installation frame 1402. The blade demister 1403 uses centrifugal force and collision principle to further capture and separate the tiny droplets in the gas, which can effectively remove the liquid foam in the gas, improve the safety and stability of subsequent processes, prevent the liquid foam from entering the pump body 16 and other equipment to cause damage, extend the service life of the equipment, reduce the equipment maintenance cost, and the vortex breaker 1405 prevents liquid water from causing cavitation in the machine pump and damaging the machine pump.

[0046] Specifically, the same three mounting frames 1402 and blade-type demisters 1403 are provided, and the three mounting frames 1402 and blade-type demisters 1403 are equidistantly distributed. The advantage is that the three equidistantly distributed blade-type demisters 1403 can better adapt to the gas processing requirements of different flow rates and working conditions, improve the adaptability and reliability of the diverter tank assembly 14, ensure that the propane dehydrogenation unit can operate stably under various conditions, and reduce equipment failures and production interruptions caused by liquid foam problems.

[0047] Specifically, a regeneration exhaust pipe 21 is provided at the bottom of the reactor 8. The other end of the regeneration exhaust pipe 21 away from the reactor 8 is connected to the connecting pipe 20. The advantage is that the design of the regeneration exhaust pipe 21 can make the hot air after the heat exchange of the heat exchanger assembly 12 and the hot air after the heat exchange of the waste heat boiler 1 be mixed, and then enter the air heating furnace 6 through the preheating air connecting pipe 5 to be heated to the high temperature of the reactor 8.

[0048] Working principle: When in use, the air and reducing gas mixture in the reactor 8 is extracted by the vacuum pump 10, and enters the heat exchanger assembly 12 through the heat exchange connecting pipe 11, and is cooled by the cold air sent by the air compressor 17 through the air connecting pipe 2 19. The gas entering the diverter tank assembly 14 is first blocked and decelerated by the baffle 1404, so that some droplets hit the baffle 1404 and separate, and then the blade-type demister 1403 uses centrifugal force and collision principle to further separate the tiny droplets. The bottom vortex breaker 1405 prevents the liquid from being discharged and forming a vortex, ensuring smooth discharge and achieving gas-liquid separation. The condensed liquid water is sent to the downstream through the pump body 16 and the connecting pipe 3 15 to complete the condensate recovery. The vacuum non-condensable gas separated in the diverter tank assembly 14 enters the front end of the waste heat boiler 1 through the connecting pipe 4 20, and is mixed with the regenerated exhaust gas. It enters the non-methane total hydrocarbon catalyst bed in turn to remove volatile organic compounds and the selective catalytic reduction bed to remove NOx and other polluting gases, and is finally discharged into the atmosphere through the exhaust gas discharge pipe 2 and the chimney, thereby achieving non-methane total hydrocarbon control and pollutant gas removal. The hot air after heat exchange in the heat exchanger component 12 is mixed with the hot air after heat exchange in the waste heat boiler 1, enters the air heating furnace 6 through the preheating air connecting pipe 5 and is heated to the high temperature of the reactor 8, and then returns to the reactor 8 through the heated air connecting pipe 7, thereby realizing the recycling of hot air. The cooling water sent through the connecting pipe 2 19 can also be used to recover heat for the circulating water and desalted water for cooling. The cooled gas enters the diversion tank component 14 through the connecting pipe 2 13, and the hot water after heat exchange in the heat exchanger component 12 enters the downstream of the device through the connecting pipe, thereby reducing the downstream heat input and realizing heat recovery and utilization.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A propane dehydrogenation device, comprising a waste heat boiler (1) and an air compressor (17), characterized in that: The outlet of the waste heat boiler (1) is provided with a waste gas discharge pipe (2), the front of the waste heat boiler (1) is provided with an online analyzer (3) and a sampler (4), the outer surface of the waste heat boiler (1) is provided with a preheated air connecting pipe (5), the other end of the preheated air connecting pipe (5) is provided with an air heating furnace (6), the outlet of the air heating furnace (6) is provided with a heated air connecting pipe (7), the other end of the heated air connecting pipe (7) away from the air heating furnace (6) is provided with a reactor (8), the outlet of the reactor (8) is provided with a connecting pipe (9), the connecting pipe (9) is provided with a connecting pipe (10), the connecting pipe (11) is provided with a connecting pipe (12), the connecting pipe (13) is provided with a connecting pipe (14), the connecting pipe (15) is provided with a connecting pipe (16), the connecting pipe (17) is provided with a connecting pipe (18), the connecting pipe (19) is provided with a connecting pipe (11) and the connecting pipe (11) is provided with a connecting pipe (12). A vacuum pump (10) is provided at the other end of the pipe (9), a heat exchange connecting pipe (11) is provided at the outlet of the vacuum pump (10), a heat exchanger assembly (12) is provided at the other end of the heat exchange connecting pipe (11) away from the vacuum pump (10), a connecting pipe (13) is provided at the outlet of the heat exchanger assembly (12), a diversion tank assembly (14) is provided at the other end of the connecting pipe (13), a connecting pipe (15) is provided at the bottom of the other end of the diversion tank assembly (14), and a pump body (16) is provided at the other end of the connecting pipe (15) away from the diversion tank assembly (14).

2. A propane dehydrogenation device according to claim 1, characterized in that: The outlet of the air compressor (17) is provided with an air connecting pipe 1 (18), the outlet of the air connecting pipe 1 (18) is provided with an air connecting pipe 2 (19), and the top outlet of the diversion tank assembly (14) is provided with a connecting pipe 4 (20) which is in communication with the waste heat boiler (1).

3. A propane dehydrogenation device according to claim 2, characterized in that: The air compressor (17) is communicated with the waste heat boiler (1) via the first air connecting pipe (18), and the second air connecting pipe (19) is communicated with the heat exchanger assembly (12).

4. A propane dehydrogenation device according to claim 1, characterized in that: The heat exchanger assembly (12) comprises a heat exchange tank (1201), a connecting seat (1202) and a connecting column (1203) are fixedly mounted on the outer surface of the heat exchange tank (1201), a connecting frame (1204) is fixedly mounted on the inner surface of the heat exchange tank (1201), and a heat exchange tube (1205) and a column frame (1206) are fixedly mounted on the inner surface of the heat exchange tank (1201).

5. A propane dehydrogenation device according to claim 1, characterized in that: The diverter tank assembly (14) includes a diverter tank body (1401), a mounting frame (1402) is fixedly installed on the inner surface of the diverter tank body (1401), a blade-type demister (1403) and a baffle (1404) are fixedly installed on the inner surface of the mounting frame (1402), and a vortex breaker (1405) is fixedly installed on the bottom of the diverter tank body (1401).

6. A propane dehydrogenation device according to claim 5, characterized in that: The installation frames (1402) and the blade-type demisters (1403) are provided in three identical numbers, and the three installation frames (1402) and the blade-type demisters (1403) are distributed at equal intervals.

7. A propane dehydrogenation device according to claim 1, characterized in that: A regeneration waste gas pipe (21) is provided at the bottom of the reactor (8), and the other end of the regeneration waste gas pipe (21) away from the reactor (8) is communicated with the connecting pipe four (20).

8. The method for controlling total non-methane hydrocarbons and recovering condensate used in a propane dehydrogenation device according to claims 1-7, characterized in that: The following steps are involved: S1: The air and reducing gas mixture in the reactor (8) is extracted by the vacuum pump (10) and enters the heat exchanger assembly (12) through the heat exchange connecting pipe (11), and is cooled by the cold air sent by the air compressor (17) through the air connecting pipe 2 (19). S2: The gas entering the diversion tank assembly (14) is first blocked and decelerated by the baffle (1404), so that some droplets collide with the baffle (1404) and separate. Then, the gas passes through the blade-type demister (1403) using centrifugal force and collision principle to further separate the tiny droplets. The bottom vortex breaker (1405) prevents the liquid from being discharged and forming a vortex, ensuring smooth discharge and achieving gas-liquid separation. S3: The condensed liquid water is sent to the downstream through the pump body (16) and the connecting pipe (15) for utilization, completing the condensate recovery. S4: The vacuum non-condensable steam separated from the diverter tank assembly (14) enters the front end of the waste heat boiler (1) through the connecting pipe four (20), and after being mixed with the regenerated waste gas, it enters the non-methane total hydrocarbon catalyst bed to remove volatile organic compounds and the selective catalytic reduction bed to remove NOx and other polluting gases in turn, and finally is discharged into the atmosphere through the exhaust gas discharge pipe (2) and the chimney, thereby achieving non-methane total hydrocarbon control and pollutant gas removal. S5: The hot air after heat exchange in the heat exchanger assembly (12) is mixed with the hot air after heat exchange in the waste heat boiler (1), enters the air heating furnace (6) through the preheating air connecting pipe (5), is heated to the high temperature of the reactor (8), and then returns to the reactor (8) through the heated air connecting pipe (7), realizing the recycling of hot air. S6: At the same time, the cooling water (which can be circulating water or desalted water to recover heat) sent by the connecting pipe 2 (19) can also be used for cooling. The cooled gas enters the diversion tank component (14) through the connecting pipe 2 (13), and the hot water after heat exchange in the heat exchanger component (12) enters the downstream of the device through the connecting pipe, thereby reducing the downstream heat input and realizing heat recovery and utilization.

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