A regeneration tank tail gas treatment system and treatment method

Abstract

The present application relates to tail gas treatment technical field, disclose a kind of regenerator tail gas treatment system and processing method, including regenerator, the gas-liquid separation mechanism is connected to the gas outlet end of regenerator, the gas outlet end of gas-liquid separation mechanism is sequentially connected with pressure tank and three waste furnace, gas-liquid separation mechanism is equipped with induced draft fan between pressure tank, the gas outlet end of three waste furnace is connected with waste gas treatment mechanism.The present application has the following advantages and effects: coal powder is in fluidized state in furnace body, after ignition in furnace body, coal powder is carried out fluidized combustion in furnace body;Opening air supplement valve, the air supplement pipe under the circular table type flow guide plate is inclined downward and gas outlet, can carry out air supplement to the upper portion of furnace body, it is favorable to the coal powder that is blown to upper portion by air intake and burns again, and air supplement pipe is inclined downward and gas blowing, can blow coal powder downward, so that coal powder reciprocating circulation flow along circular table type flow guide plate and furnace body inner wall, it is favorable to coal powder and fully burns.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail gas treatment, in particular to a regeneration tank tail gas treatment system and treatment method. BACKGROUND

[0002] In the production of synthetic ammonia, the tail gas released in the production process of the variable desorption, semi-desorption regeneration tank contains methane, carbon monoxide, carbon dioxide, oxygen, nitrogen, and trace amounts of hydrogen sulfide. In order to achieve the goal of eliminating odors and clean production, the tail gas needs to be treated. Currently, the tail gas is usually treated by a three-waste furnace. The three-waste furnace is a device that mixes and blends the slag produced in the gas-making process, fine ash from the gas-making dust collector, and part of the coal gangue, bituminous coal, and anthracite powder into a fluidized bed in the furnace for combustion to produce high-temperature flue gas for heat recovery. At the same time, the purpose of using up the raw materials for gas-making is achieved. The existing three-waste furnaces have the problems of uneven coal feeding in the boiling bed, large amount of fly ash, and continuous operation leading to a large amount of unburned fly ash in the fly ash, which makes it difficult to fully utilize the heat energy, and the unburned fly ash is hard, which also causes great wear to the furnace body. SUMMARY

[0003] The purpose of the present application is to provide a regeneration tank tail gas treatment system and treatment method, which has the effects of uniform coal feeding, less fly ash, and full combustion of fly ash and tail gas.

[0004] The above technical purpose of the present application is achieved by the following technical scheme: a regeneration tank tail gas treatment system, comprising a regeneration tank, a gas-liquid separation mechanism connected to the gas outlet end of the regeneration tank, a pressure maintaining tank and a three-waste furnace connected in sequence to the gas outlet end of the gas-liquid separation mechanism, an induced draft fan provided between the gas-liquid separation mechanism and the pressure maintaining tank, and a waste gas treatment mechanism connected to the gas outlet end of the three-waste furnace.

[0005] By adopting the above technical scheme, the tail gas released in the production process of the regeneration tank contains methane, carbon monoxide, carbon dioxide, oxygen, nitrogen, and trace amounts of hydrogen sulfide. The gas-liquid separation mechanism is connected to the gas outlet end of the regeneration tank, so that the liquid droplets in the tail gas of the regeneration tank are separated and returned to the regeneration tank. The dry tail gas is sent to the pressure maintaining tank by the induced draft fan. The pressure maintaining tank can intermittently allow the tail gas to enter the three-waste furnace, and can further improve the gas-liquid separation effect. The dry tail gas in the pressure maintaining tank is sent to the three-waste furnace, where the hydrogen sulfide, methane, and carbon monoxide are rapidly combusted. The sulfur dioxide produced by the combustion of hydrogen sulfide enters the waste gas treatment mechanism along with the combustion flue gas for treatment.

[0006] The further arrangement of the present application is that the three-waste furnace comprises a cylindrical furnace body, the bottom of the furnace body is provided with a wind chamber, a gas cap and a slag discharge port, the wind chamber is connected with an air inlet pipe, the air inlet pipe is provided with an air inlet valve, the middle part of the furnace body is provided with a conical guide plate, a plurality of tail gas pipes are arranged along the circumferential direction below the conical guide plate, the tail gas pipes are provided with tail gas valves, and the gas outlet direction of the tail gas pipes is inclined downward; a circular table type guide plate is arranged above the conical guide plate, a plurality of air supplement pipes are uniformly arranged along the circumferential direction below the circular table type guide plate, the air supplement pipes are provided with air supplement valves, the gas outlet direction of the air supplement pipes is inclined downward, the diameter of the circular table type guide plate gradually increases from bottom to top, and the upper surface diameter of the circular table type guide plate is greater than the bottom surface diameter of the conical guide plate and the lower surface diameter.

[0007] By adopting the above technical scheme: when the three-waste furnace is burning, the air inlet pipe sprays air flow upward, blows up the fly ash in the furnace body, and makes the fly ash in a fluidized state, the fly ash in the fluidized state can fully contact with air, and the fly ash can be rapidly burned to release a large amount of heat energy. The middle part of the furnace body is provided with a conical guide plate, and the tail gas pipes are arranged below the guide plate, the tail gas pipes are inclined downward to discharge tail gas containing hydrogen sulfide, methane, carbon monoxide and carbon dioxide, the hydrogen sulfide, methane and carbon monoxide in the furnace body can be rapidly burned, and the inclined downward discharged tail gas flow and the conical guide plate can guide the flue gas in the furnace body. The air inlet pipe blows the fly ash upward, so that the fly ash is burned in a fluidized state, the flue gas generated by combustion flows upward under the action of the air flow of the air inlet pipe, and a large amount of unburned fly ash is entrained in the flue gas, the unburned fly ash has a large mass, and the unburned fly ash is subjected to a large downward inertial force after impacting on the guide plate, so that part of the unburned fly ash returns to the lower part of the furnace body to burn again, the inclined downward discharged tail gas also has a washing effect on the fly ash with a large mass, which is beneficial to the inclined downward flow of the fly ash with a large mass, the fly ash in the furnace body can form a circulating flow along the inner wall of the furnace body and the conical guide plate under the action of the tail gas and the air inlet, the residence time of the fly ash in the furnace body is increased, the fly ash is fully burned, and the hydrogen in the tail gas can promote the burnout of the fly ash. The smoke dust with a light mass is subjected to a small force by the guide plate and the tail gas flow, and continues to flow upward, the circular table type guide plate is arranged below the conical guide plate, the circular table type guide plate can further block the large particle fly ash in the flue gas, the conical guide plate is provided with the air supplement pipes, and the air in the air supplement pipes is inclined downward to discharge, so that the oxygen content in the upper part of the furnace body is increased during the process of washing the large particle fly ash in the fly ash, and the burnout of the fly ash is further promoted.

[0008] The further arrangement of the present application is that a plurality of gas outlet ports are uniformly arranged along the circumferential direction above the furnace body, the gas outlet ports are located above the circular table type guide plate, the gas outlet ports are connected with gas outlet pipes, the gas outlet pipes are provided with gas outlet valves, and the gas outlet pipes are connected with a waste gas treatment mechanism.

[0009] By adopting the technical scheme, the circular truncated cone guide plate is provided with the gas outlet, when the flue gas valve is opened, most of the dust-containing flue gas enters the preheating groove from the flue gas pipe, and part of the flue gas is discharged from the gas outlet, under the action of the circular truncated cone guide plate, the flue gas flows upwards from the outlet of the circular truncated cone guide plate, and then enters the flue gas pipe, the particles with large mass in the flue gas are subjected to large inertial force of the airflow, so the particles with large mass flow along the airflow into the flue gas pipe, the airflow speed is slow at the position far from the outlet of the circular truncated cone guide plate, the particles in the flue gas at the position are less, and the clean flue gas is discharged from the gas outlet, so that the fly ash amount of the discharged gas can be greatly reduced, and the subsequent waste gas treatment is facilitated.

[0010] Further, the furnace body is provided with a flue gas passage, the flue gas passage is provided with a preheating groove above, the preheating groove is provided with a feeding port above, the flue gas passage is provided with a gas distribution plate at the joint with the preheating groove, the gas distribution plate is uniformly provided with a plurality of flue gas pipes, the flue gas pipes are provided with flue gas valves, the preheating groove is provided with a material distribution pipe above, the lower end of the material distribution pipe is located in the furnace body, and the material distribution pipe is provided with a material distribution valve.

[0011] By adopting the technical scheme, when the flue gas valve is opened, the flue gas in the furnace body flows into the preheating groove along the flue gas pipe, and the pulverized coal enters the preheating groove from the feeding port, the pulverized coal in the preheating groove is rapidly dispersed under the action of the flue gas, and the temperature of the pulverized coal rapidly rises after being mixed with the high-temperature flue gas, then the high-temperature flue gas containing a large amount of pulverized coal flows back to the furnace body along the material distribution pipe, the preheated pulverized coal can rapidly start to burn, the pulverized coal is dispersed along the material distribution pipe after being dispersed by the flue gas, and then enters the furnace body, so that the pulverized coal can be rapidly dispersed in the furnace body, the pulverized coal can be uniformly fed, and the temperature in the furnace body can be stably ensured. The flue gas entering the preheating groove in the furnace body can contain some unburned fly ash, the fly ash is mixed with the pulverized coal and flows back to the furnace body for further combustion, and the pulverized coal can be fully burned.

[0012] Further, the lower end of the material distribution pipe is provided with a plurality of material distribution ports, and the material distribution ports are located above the air chamber.

[0013] By adopting the technical scheme, the flue gas containing the pulverized coal flows downwards from the lower end of the conical guide plate, and the pulverized coal can be uniformly distributed in the entire furnace body.

[0014] Further, the feeding port is provided with a pulverizer.

[0015] By adopting the technical scheme, the pulverizer can crush the coal gangue, coal cinder and the like into pulverized coal with uniform particle size, and then the pulverized coal is sent into the preheating groove.

[0016] Further, the furnace body is provided with a steam coil.

[0017] By adopting the technical scheme, the steam coil can recycle and utilize the heat energy in the furnace body.

[0018] The application further provides a method for recycling and utilizing heat energy in a furnace body, comprising the following steps:

[0019] S1, coal powder is put into the furnace body, the air inlet valve, the air supplement valve and the tail gas valve are opened, the air outlet valve, the material distribution valve and the flue gas valve are closed, the furnace body is ignited, the induced draft fan and the pulverizer are started, at this time, the induced draft fan blows air into the furnace body through the air inlet pipe, so that the coal powder in the furnace body is in a fluidized state, the coal powder and the tail gas burn in the furnace body after ignition, and the pressure in the furnace body rises;

[0020] S2, the air inlet valve, the tail gas valve and the material distribution valve are closed, the air outlet valve, the flue gas valve and the air supplement valve are opened, and the induced draft fan and the pulverizer are closed, at this time, part of the flue gas in the furnace body enters the preheating tank through the flue gas pipe, and part of the flue gas in the furnace body is discharged from the air outlet pipe, after the pressure in the preheating tank is consistent with the pressure in the furnace body, the slag discharge port is opened to discharge slag, then the slag discharge port is closed, the material distribution pump and the material distribution valve are opened, and the coal powder in the preheating tank is transported to the lower part of the furnace body;

[0021] S3, after the pressure in the furnace body is atmospheric pressure, the step S1 is repeated.

[0022] The application further provides that in the step S1, the maximum pressure in the furnace body is 0.3-0.4 Mpa.

[0023] The application has the following beneficial effects:

[0024] 1. Firstly, a part of the coal powder is put into the furnace body, the air inlet valve on the air chamber is opened, and air enters the furnace body from the air inlet pipe under the action of the induced draft fan, at this time, the coal powder is in a fluidized state in the furnace body, after the furnace body is ignited, the coal powder is burned in a fluidized state in the furnace body; the air supplement valve is opened, the air supplement pipe below the circular table type flow guide plate blows air obliquely downward, which can supplement air to the upper part of the furnace body, and is beneficial to the coal powder blown to the upper part by the air to be burned again, and the air supplement pipe blows air obliquely downward, which can blow the coal powder downward, so that the coal powder flows back and forth along the circular table type flow guide plate and the inner wall of the furnace body, which is beneficial to the coal powder to be burned fully; the tail gas valve is opened, the tail gas containing hydrogen sulfide, methane, carbon monoxide and carbon dioxide in the regenerated gas enters the furnace body and burns together with the coal powder, since the air outlet valve, the material distribution valve and the flue gas valve are closed, the pressure in the furnace body rises, which is beneficial to the tail gas to be burned fully; at this time, the pulverizer is in an open state, and the coal powder crushed by the pulverizer falls into the preheating tank from the feeding port.

[0025] 2. The fly ash and tail gas in the furnace body are closed for combustion for a certain time, so that the fly ash and tail gas can be fully combusted, the inlet valve and the tail gas valve are closed when the pressure in the furnace body reaches the set pressure, the air inlet in the furnace body is stopped, the outlet valve, the material distribution valve, the air supplement valve and the flue gas valve are opened, the pressure in the furnace body is relatively high, part of the flue gas in the furnace body enters the preheating tank through the flue gas pipe and mixes with the coal powder in the preheating tank to form flue gas containing coal powder, when the pressure in the preheating tank is equivalent to the pressure in the furnace body, the slag discharge port is first opened to discharge the ash and slag in the furnace body, and then the material distribution pump is opened to convey the flue gas containing coal powder to the furnace body; part of the flue gas in the furnace body enters the preheating tank, and part of the flue gas is discharged from the outlet pipe. When the air outlet in the furnace body, the air inlet valve and the tail gas valve in the furnace body stop discharging, the air flow in the furnace body mainly discharges from the upper flue gas pipe, the air flow at the lower end of the furnace body is relatively slow, which is beneficial to the settlement of the combusted fly ash in the furnace body, under the action of the conical guide plate, the circular table type guide plate and the air supplement air flow, the large-particle dust is intercepted in the furnace body and settles at the bottom of the furnace body, and finally is discharged from the slag discharge port, so that the dust content in the air outlet air flow can be greatly reduced, the subsequent dust removal load can be reduced, and most of the fly ash in the air outlet air flow has been combusted and is soft, so that the abrasion of the furnace body and the subsequent dust removal mechanism can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0027] Figure 1 is a structural schematic diagram of the present application.

[0028] Figure 2 is a structural schematic diagram of the three-waste furnace.

[0029] In the figure, 1 is a regeneration tank, 2 is a gas-liquid separation mechanism, 3 is a three-waste furnace, 31 is a furnace body, 32 is an air chamber, 33 is a gas cap, 34 is a slag discharge port, 35 is an air inlet pipe, 36 is an air inlet valve, 37 is a conical guide plate, 38 is a tail gas pipe, 39 is a tail gas valve, 310 is a circular table type guide plate, 311 is an air supplement pipe, 312 is an air supplement valve, 313 is an outlet pipe, 314 is an outlet valve, 315 is a flue gas passage, 316 is a preheating tank, 317 is a feeding port, 318 is a gas distribution plate, 319 is a flue gas pipe, 320 is a flue gas valve, 321 is a material distribution pipe, 322 is a material distribution valve, 4 is an induced draft fan, 5 is a waste gas treatment mechanism, and 6 is a pulverizer. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Example: A tail gas treatment system for a regeneration tank 1, such as Figure 1 As shown, it includes a regeneration tank 1, a gas-liquid separation mechanism 2 connected to the gas outlet of the regeneration tank 1, a waste gas furnace 3 connected to the gas outlet of the gas-liquid separation mechanism 2, an induced draft fan 4 between the gas-liquid separation mechanism 2 and the waste gas furnace 3, and a waste gas treatment mechanism 5 connected to the gas outlet of the waste gas furnace 3.

[0032] During the production process, the exhaust gas released by the regeneration tank 1 contains a large amount of hydrogen sulfide, methane, carbon monoxide, and carbon dioxide. A gas-liquid separation mechanism 2 is connected to the outlet of the regeneration tank 1 to separate the liquid droplets in the exhaust gas and return them to the regeneration tank 1. The dried exhaust gas is sent into the waste gas furnace 3 by the induced draft fan 4. In the waste gas furnace 3, hydrogen sulfide, methane, and carbon monoxide are rapidly burned. The sulfur dioxide produced by the combustion of hydrogen sulfide enters the waste gas treatment mechanism 5 along with the combustion flue gas for treatment.

[0033] like Figure 2 As shown, the waste gas furnace 3 includes a cylindrical furnace body 31. The bottom of the furnace body 31 is provided with an air chamber 32, an air cap 33, and a slag discharge port 34. An air inlet pipe 35 is connected to the air chamber 32, and an air inlet valve 36 is provided on the air inlet pipe 35. A conical guide plate is provided in the middle of the furnace body 31. Several tail gas pipes 38 are provided along the circumferential direction below the conical guide plate. Tail gas valves 39 are provided on the tail gas pipes 38. The outlet direction of the tail gas pipes 38 is obliquely downward. A frustum-shaped guide plate 310 is provided above the conical guide plate 37. Several make-up air pipes 311 are evenly provided along the circumferential direction below the frustum-shaped guide plate 310. Make-up air valves 312 are provided on the make-up air pipes 311. The outlet direction of the make-up air pipes 311 is obliquely downward. The diameter of the frustum-shaped guide plate 310 gradually increases from bottom to top. The diameter of the upper surface of the frustum-shaped guide plate 310 is larger than the diameter of the bottom surface of the conical guide plate, and the diameter of the lower surface is smaller than the inner diameter of the furnace body 31.

[0034] When the three-waste furnace 3 is burning, the air inlet pipe 35 sprays air flow upward, blowing up the fly ash in the furnace body 31, so that the fly ash is in a fluidized state, and the fly ash in the fluidized state can be in full contact with air, so that the fly ash can be burned rapidly and release a large amount of heat energy. The middle part of the furnace body 31 is provided with a conical guide plate 37, and the lower part of the conical guide plate 37 is provided with a tail gas pipe 38. The tail gas pipe 38 discharges tail gas containing hydrogen sulfide, hydrogen and carbon dioxide obliquely downward. In the furnace body 31, hydrogen sulfide, methane and carbon monoxide can be burned rapidly. The obliquely downward discharged tail gas flow and the conical guide plate 37 together can guide the flue gas in the furnace body 31. The air inlet pipe 35 blows the fly ash upward, so that the fly ash is burned in a fluidized state. The flue gas generated by the burning flows upward under the action of the air flow of the air inlet pipe 35, and a large amount of unburned fly ash is entrained in the flue gas. The unburned fly ash has a large mass, and after colliding with the guide plate, the unburned fly ash is subjected to a large downward inertial force, so that part of the unburned fly ash returns to the lower part of the furnace body 31 for burning. The obliquely downward discharged tail gas also has a washing effect on the fly ash with a large mass, which is conducive to the obliquely downward flow of the fly ash with a large mass and the downward falling of the fly ash along the inner wall of the furnace body 31. Under the action of the tail gas and the air inlet, the fly ash in the furnace body 31 can form a circulating flow along the inner wall of the furnace body 31 and the conical guide plate in the furnace body 31, increase the residence time of the fly ash in the furnace body 31, make the fly ash burn fully, and the hydrogen in the tail gas can promote the burning of the fly ash. The smoke dust with a lighter mass is subjected to a smaller force by the guide plate and the tail gas flow, and will continue to flow upward. The lower part of the conical guide plate is provided with a circular table type guide plate 310, which can further block the large particle fly ash in the flue gas. The lower part of the conical guide plate is provided with a gas supplement pipe 311, and the air in the gas supplement pipe 311 is discharged obliquely downward. The process of washing the large particles in the fly ash can also increase the oxygen content in the upper part of the furnace body 31, and further promote the burning of the fly ash.

[0035] As shown in Figure 2 The upper part of the furnace body 31 is uniformly provided with a plurality of gas outlets in the circumferential direction. The gas outlet is located above the circular table type guide plate 310, and the gas outlet is connected with a gas outlet pipe 313. The gas outlet pipe 313 is provided with a gas outlet valve 314, and the gas outlet pipe 313 is connected with the waste gas treatment mechanism 5.

[0036] The upper part of the circular table type guide plate 310 is provided with a gas outlet. When the flue gas valve is opened, most of the dust-containing flue gas enters the preheating groove 316 from the flue gas pipe 319, and part of the flue gas is discharged from the gas outlet. Under the action of the circular table type guide plate 310, the flue gas flows upward from the outlet above the circular table type guide plate 310, and then enters the flue gas pipe 319. The particles with a large mass in the flue gas are subjected to a large inertial force by the air flow, so that the particles with a large mass flow into the flue gas pipe 319 along the air flow. The air flow speed is slow at the position far from the outlet above the circular table type guide plate 310, and the amount of particulate matter in the flue gas at this position is small. The relatively clean flue gas will be discharged from the gas outlet. Through this setting, the fly ash amount of the discharged gas can be greatly reduced, which is conducive to the subsequent waste gas treatment.

[0037] As Figure 2 shown, the top of the furnace body 31 is provided with a flue gas passage 315, the flue gas passage 315 is provided with a preheating groove 316 above, the preheating groove 316 is provided with a feeding port 317 above, the flue gas passage 315 is provided with a gas distribution plate 318 at the joint with the preheating groove 316, the gas distribution plate 318 is uniformly provided with a plurality of flue gas pipes 319, the flue gas pipes 319 are provided with flue gas valves 320, the preheating groove 316 is provided with a material distribution pipe 321 above, the lower end of the material distribution pipe 321 is located in the furnace body 31, and the material distribution pipe 321 is provided with a material valve 322.

[0038] After the flue gas valve 320 is opened, the flue gas in the furnace body 31 will enter the preheating groove 316 along the flue gas pipe 319, and the pulverized coal enters the preheating groove 316 from the feeding port 317, the pulverized coal in the preheating groove 316 is rapidly dispersed under the action of the flue gas, and after mixing with the high-temperature flue gas, the temperature of the pulverized coal rapidly rises, then the high-temperature flue gas containing a large amount of pulverized coal flows back to the furnace body 31 along the material distribution pipe 321, the preheated pulverized coal can rapidly start to burn, and after the pulverized coal is dispersed by the flue gas, it enters the furnace body 31 along the material distribution pipe 321, which facilitates the rapid dispersion of the pulverized coal in the furnace body 31, and can realize uniform feeding of the pulverized coal, and the preheated pulverized coal entering the furnace body 31 can ensure the stability of the temperature in the furnace body 31. There may be some unburned fly ash in the flue gas entering the preheating groove 316 in the furnace body 31, which is mixed with the pulverized coal and flows back to the furnace body 31 for further combustion, which is beneficial to the full combustion of the pulverized coal.

[0039] As Figure 2 shown, the lower end of the material distribution pipe 321 is provided with a plurality of material distribution ports, and the material distribution ports are located above the air chamber 32. The flue gas containing pulverized coal flows downward from below the conical guide plate 37, which can uniformly distribute the pulverized coal to the entire furnace body 31.

[0040] As Figure 2 shown, the feeding port 317 is provided with a pulverizer 6 above, the pulverizer 6 can crush coal gangue, coal slag and the like into pulverized coal with uniform particle size, and then send the pulverized coal into the preheating groove 316.

[0041] The furnace body 31 is provided with a steam coil, which can recycle and utilize the heat energy in the furnace body 31.

[0042] A regeneration tank 1 tail gas treatment method, comprising the following steps:

[0043] S1, put the pulverized coal into the furnace body 31, open the air inlet valve 36, the air supplement valve 312 and the tail gas valve 39, close the air outlet valve 314, the material distribution valve 322 and the flue gas valve, ignite in the furnace body 31, start the induced draft fan 4 and the pulverizer 6, at this time the induced draft fan 4 blows air into the furnace body 31 through the air inlet pipe 35, so that the pulverized coal in the furnace body 31 becomes fluidized, after ignition, the pulverized coal and the tail gas burn in the furnace body 31, the pressure in the furnace body 31 rises, and the maximum pressure in the furnace body 31 is 0.3-0.4 Mpa. First, put a part of the pulverized coal into the furnace body 31, open the air inlet valve 36 on the air chamber 32, air enters the furnace body 31 from the air inlet pipe 35 under the action of the induced draft fan 4, at this time the pulverized coal in the furnace body 31 is in a fluidized state, after ignition in the furnace body 31, the pulverized coal is fluidized and burned in the furnace body 31; open the air supplement valve 312, the air supplement pipe 311 below the circular table type flow guide plate 310 blows air obliquely downward, which can supplement air to the upper part of the furnace body 31, which is beneficial to the re-burning of the pulverized coal blown to the upper part by the air, and the air supplement pipe 311 blows air obliquely downward, which can blow the pulverized coal downward, so that the pulverized coal flows back and forth along the circular table type flow guide plate 310 and the inner wall of the furnace body 31, which is beneficial to the full combustion of the pulverized coal; open the tail gas valve 39, the tail gas containing hydrogen sulfide, hydrogen and carbon dioxide in the production enters the furnace body 31 and burns with the pulverized coal, because the air outlet valve 314, the material distribution valve 322 and the flue gas valve are closed, the pressure in the furnace body 31 rises, which is beneficial to the full combustion of the tail gas; at this time, the pulverizer 6 is in an open state, the pulverized coal crushed by the pulverizer 6 falls into the preheating groove 316 from the feeding port 317.

[0044] S2, close the intake valve 36, the exhaust valve 39 and the material valve 322, open the outlet valve 314, the flue gas valve and the air supplement valve 312, close the induced draft fan 4 and the pulverizer 6, at this time, part of the flue gas in the furnace body 31 enters the preheating tank 316 from the flue gas pipe 319, part of the flue gas in the furnace body 31 is discharged from the outlet pipe 313, after the pressure in the preheating tank 316 is consistent with the pressure in the furnace body 31, open the slagging port 34 to discharge the slag, then close the slagging port 34, open the material pump and the material valve 322, and the pulverized coal in the preheating tank 316 is transported to the lower part of the furnace body 31. The pulverized coal ash and the exhaust gas in the furnace body 31 are closed and burned for a certain period of time, so that the pulverized coal ash and the exhaust gas can be fully burned, after the pressure in the furnace body 31 reaches the set pressure, the intake valve 36 and the exhaust valve 39 are closed, the intake in the furnace body 31 is stopped, the outlet valve 314, the material valve 322, the air supplement valve 312 and the flue gas valve are opened, the pressure in the furnace body 31 is higher, part of the flue gas in the furnace body 31 enters the preheating tank 316 from the flue gas pipe 319 and mixes with the pulverized coal in the preheating tank 316 to form flue gas containing pulverized coal, when the pressure in the preheating tank 316 is equivalent to the pressure in the furnace body 31, first open the slagging port 34 to discharge the ash and slag in the furnace body 31, then open the material pump, the material pump transports the flue gas containing pulverized coal into the furnace body 31, the pulverized coal ash can be uniformly distributed in the furnace body 31, which is convenient for fluidized combustion of the pulverized coal ash next time; part of the flue gas in the furnace body 31 enters the preheating tank 316, and part of the flue gas is discharged from the outlet pipe 313. When the flue gas is discharged from the furnace body 31, the intake valve 36 and the exhaust valve 39 in the furnace body 31 stop discharging, the gas flow in the furnace body 31 is mainly discharged from the upper flue gas pipe 319, the gas flow velocity at the lower end of the furnace body 31 is relatively slow, which is beneficial to the settlement of the burned pulverized coal ash in the furnace body 31, under the action of the conical guide plate, the circular table type guide plate 310 and the air supplement gas flow, the large particle dust is intercepted in the furnace body 31 and settles at the bottom of the furnace body 31, and finally is discharged from the slagging port 34, which can greatly reduce the dust content in the discharged gas flow and reduce the subsequent dust removal load. The pulverized coal ash in the discharged gas flow is mostly burned out, and the texture is soft, which can greatly reduce the abrasion to the furnace body 31 and the subsequent dust removal mechanism.

[0045] S3, after the pressure in the furnace body 31 reaches atmospheric pressure, repeat step S1.

Claims

1. A regeneration tank off-gas treatment system, characterized by: A tail gas treatment system of a regeneration tank (1) comprises a regeneration tank (1), a gas-liquid separation mechanism (2) connected to the gas outlet end of the regeneration tank (1), a pressure maintaining tank and a three-waste furnace (3) connected to the gas outlet end of the gas-liquid separation mechanism (2) in sequence, an induced draft fan (4) arranged between the gas-liquid separation mechanism (2) and the pressure maintaining tank, and a waste gas treatment mechanism (5) connected to the gas outlet end of the three-waste furnace (3). The three-waste furnace (3) comprises a cylindrical furnace body (31), the bottom of the furnace body (31) is provided with an air chamber (32), a gas cap (33) and a slag discharge port (34), the air chamber (32) is connected with an air inlet pipe (35), the air inlet pipe (35) is provided with an air inlet valve (36), the middle of the furnace body (31) is provided with a conical guide plate (37), a plurality of tail gas pipes (38) are arranged along the circumferential direction below the conical guide plate (37), the tail gas pipes (38) are provided with tail gas valves (39), and the gas outlet direction of the tail gas pipes (38) is inclined downward; a circular truncated cone guide plate (310) is arranged above the conical guide plate (37), a plurality of air supplement pipes (311) are uniformly arranged along the circumferential direction below the circular truncated cone guide plate (310), the air supplement pipes (311) are provided with air supplement valves (312), the gas outlet direction of the air supplement pipes (311) is inclined downward, the diameter of the circular truncated cone guide plate (310) gradually increases from bottom to top, and the upper surface diameter of the circular truncated cone guide plate (310) is greater than the bottom surface diameter of the conical guide plate (37) and the lower surface diameter is smaller than the inner diameter of the furnace body (31); A plurality of gas outlet ports are uniformly arranged along the circumferential direction above the furnace body (31), the gas outlet ports are located above the circular truncated cone guide plate (310), the gas outlet ports are connected with gas outlet pipes (313), the gas outlet pipes (313) are provided with gas outlet valves (314), and the gas outlet pipes (313) are connected with the waste gas treatment mechanism (5); The top of the furnace body (31) is provided with a flue gas passage (315), the flue gas passage (315) is provided with a preheating tank (316) above, the preheating tank (316) is provided with a feeding port (317) above, a gas distribution plate (318) is arranged at the joint of the flue gas passage (315) and the preheating tank (316), a plurality of flue gas pipes (319) are uniformly arranged on the gas distribution plate (318), the flue gas pipes (319) are provided with flue gas valves (320), the preheating tank (316) is provided with a material distribution pipe (321) above, the lower end of the material distribution pipe (321) is located in the furnace body (31), the material distribution pipe (321) is provided with a material distribution valve (322), and the material distribution pipe (321) is provided with a material distribution pump.

2. A regenerator off-gas treatment system according to claim 1, characterized in that: The lower end of the material distribution pipe (321) is provided with a plurality of material distribution ports, and the material distribution ports are located above the air chamber (32).

3. A regenerator off-gas treatment system according to claim 1, characterized in that: The feeding port (317) is provided with a crusher (6) above.

4. A regenerator vessel off-gas treatment system according to claim 1, characterized in that: The furnace body (31) is provided with a steam coil.

5. A method for treating a regenerator off-gas using the regenerator off-gas treatment system according to any one of claims 2 to 4, characterized by: The method comprises the following steps: S1, put the pulverized coal into the furnace body (31), open the air inlet valve (36), the air supplement valve (312) and the tail gas valve (39), close the air outlet valve (314), the material distribution valve (322) and the flue gas valve, ignite in the furnace body (31), start the induced draft fan (4) and the pulverizer (6), at this time the induced draft fan (4) blows air into the furnace body (31) through the air inlet pipe (35), so that the pulverized coal in the furnace body (31) becomes fluidized, after ignition, the pulverized coal and the tail gas burn in the furnace body (31), the pressure in the furnace body (31) rises; S2, close the air inlet valve (36), the tail gas valve (39), the air supplement valve (312) and the material distribution valve (322), open the air outlet valve (314) and the flue gas valve, close the induced draft fan (4) and the pulverizer (6), at this time part of the flue gas in the furnace body (31) enters the preheating tank (316) from the flue gas pipe (319), part of the flue gas in the furnace body (31) is discharged from the air outlet pipe (313), after the pressure in the preheating tank (316) is consistent with the pressure in the furnace body (31), open the slag discharge port (34) to discharge the slag, then close the slag discharge port (34), open the material distribution pump and the material distribution valve (322), and transport the pulverized coal in the preheating tank (316) to the lower part of the furnace body (31); S3, after the pressure in the furnace body (31) is atmospheric pressure, repeat step S1.

6. The regenerator vessel off-gas treatment method of claim 5, wherein: In the step S1, the maximum pressure in the furnace body (31) is 0.3-0.4 Mpa.

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