A flue gas treatment system and method adapted for cracking reaction

Abstract

The present invention relates to a flue gas treatment system and treatment method adapted for cracking reaction, wherein a first air outlet pipe in the treatment system is axially connected with a rotating shaft extending longitudinally, a plurality of impellers arranged along its axial direction are fixedly connected to the rotating shaft, a cam located outside the first air outlet pipe is fixedly connected to the rotating shaft, the upper end of the cam is in contact with and connected to a piston sliding in a slide cylinder along the height direction, and a valve plate sliding in a cold air inlet pipe along the height direction is fixedly connected to the top surface of the piston. When the present invention is in use, when the air intake is too large or the air intake is large due to a fault, the rotating shaft drives the cam to rotate too fast, causing the piston to be pushed to the highest point by the cam and not yet dropped, and the cam is pushed onto the piston again, thereby causing the valve plate to be continuously located at the highest point, thereby continuously limiting the cold air volume, and when the cold air volume decreases, the corresponding impeller rotation speed in the first air outlet pipe decreases, thereby reducing the rotation speed of the cam, thereby causing the valve plate to move downward, thereby realizing self-regulation of the air intake.

Description

Technical Field

[0001] The present invention relates to the field of flue gas, and in particular to the field of flue gas purification and treatment technology, and specifically refers to a flue gas treatment system and treatment method adapted for cracking reactions. Background Art

[0002] The garbage low-temperature pyrolysis equipment is a device that can reduce the amount of domestic waste and treat it harmlessly. During operation, the equipment removes moisture from organic waste through the heat energy generated by the magnetic core components and then pyrolyzes and carbonizes it, ultimately producing only a small amount of ash powder.

[0003] Low-temperature pyrolysis equipment draws on the working principle of pyrolysis reactors and improves it to pyrolyze garbage under medium and low temperature conditions. Although high-temperature pyrolysis can obtain more gas, its equipment investment and operating costs will increase significantly with the increase in temperature. Under low-temperature and low-speed heating conditions, organic molecules have enough time to decompose at their weak joints and recombine into thermally stable solids, which are difficult to decompose further, and the solid yield increases. Low-temperature pyrolysis equipment treats garbage through medium and low-temperature pyrolysis. While achieving the harmlessness and reduction of garbage, it can also obtain pyrolysis carbon fuel, and then supply an appropriate amount of air through the magnetic core assembly to make the pyrolysis carbon burn, and the heat generated is supplied to the garbage pyrolysis, with high thermal efficiency. The core technology is to make the oxygen atoms entering the equipment more active through the special arrangement of the magnetic core assembly, and have a closer combination with the carbon atoms, thereby accelerating the carbonization speed of the garbage and increasing the carbonization temperature, and using the garbage's own calorific value to achieve garbage reduction.

[0004] The flue gas generated by low-temperature pyrolysis needs to be purified subsequently. During the flue gas purification process, in order to ensure the treatment effect, a large amount of consumables are often consumed. For example, in the flue gas rapid cooling device and the flue gas deacidification module, the amount of cooling gas and neutralizing particles used is large, resulting in a lot of waste. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a flue gas treatment system adapted to cracking reactions and a method for using the system, thereby reducing the amount of consumables used and saving costs.

[0006] The present invention is achieved through the following technical scheme: a flue gas treatment system adapted to cracking reactions, comprising a flue gas secondary combustion device, a catalytic combustion device, an SCR denitrification reactor, a flue gas rapid cooling device, a flue gas deacidification module, an adsorption unit, a bag dust removal system, and an ash treatment system which are arranged in sequence; a first air outlet pipe of the flue gas rapid cooling device is axially connected to a longitudinally extending rotating shaft, a plurality of impellers arranged along its axial direction are fixedly connected to the rotating shaft, a cam located outside the first air outlet pipe is fixedly connected to the rotating shaft, the upper end of the cam is in contact with a piston that slides in a slide cylinder along a height direction, a valve plate that extends upward and slides in a height direction in a cold air inlet pipe is fixedly connected to the top surface of the piston, and the cooling inlet pipe is connected to the cold air inlet of the dual-fluid spray gun.

[0007] When the present invention is in use, the airflow atomized by alkali liquid drives the rotating shaft and the cam to rotate when passing through the fan wheel. The rotation of the cam drives the valve plate to move up and down in the cold air inlet pipe through the piston, so that the air intake of the cold air inlet can be properly adjusted. In order to ensure sufficient cooling of the flue gas, the air intake will be increased. However, excessive air intake will lead to waste of air intake. Therefore, when the air intake is too large or the air intake is large due to a malfunction, the rotating shaft drives the cam to rotate too fast, causing the piston to be pushed to the highest point by the cam and not yet dropped. The cam is pushed onto the piston again, causing the valve plate to be continuously located at the highest point, thereby continuously limiting the cold air volume. When the cold air volume decreases, the rotation speed of the fan wheel in the corresponding first air outlet pipe decreases, thereby reducing the rotation speed of the cam, causing the valve plate to move downward, thereby realizing self-regulation of the air intake volume.

[0008] Preferably, a spring is provided in the slide cylinder to drive the piston to move downward. The preferred solution facilitates the piston to move downward by providing the spring.

[0009] Preferably, the bottom end of the piston is connected to an electric push rod, the bottom end of the electric push rod is fixedly connected to a convex block in contact with the cam, and the contact surface between the convex block and the cam is an arc surface.

[0010] This preferred solution adjusts the position of the protrusion by setting an electric push rod. When self-adjustment is not required, the electric push rod can be driven to drive the protrusion to move upward, so that the protrusion does not contact the cam.

[0011] Preferably, the slide cylinder is also connected to an oil inlet pipe. The preferred solution facilitates the lubrication of the piston, the lubrication of the bump and the cam through the provision of the oil inlet pipe.

[0012] Preferably, the smoke rapid cooling device is further provided with a smoke inlet located between the dual-fluid spray gun and the first exhaust pipe and below the cooling gas, the smoke inlet being connected to the smoke inlet pipe, the smoke inlet extending longitudinally, and provided with a plurality of smoke exhaust holes extending longitudinally for the smoke to flow upward, the dual-fluid spray guns being arranged sequentially along the longitudinal direction.

[0013] This preferred solution increases the spray range of the alkali solution by arranging the dual-fluid spray guns.

[0014] Preferably, the flue gas rapid cooling device is further provided with drainage pipes located at the upper and lower ends of the dual-fluid spray gun.

[0015] In this preferred solution, the drainage pipe is provided so that the upwardly sprayed and downwardly sprayed parts also enter the lateral airflow.

[0016] Preferably, the smoke inlet is also connected to a flow limiting port located between the first air outlet pipe and the smoke inlet and ejecting air upwards, the flow limiting port is connected to a diverter valve via a flow limiting pipe, and the diverter valve is arranged on the first air outlet pipe.

[0017] When this preferred solution is in use, a portion of the flue gas entering the first exhaust pipe flows back into the flue gas rapid cooling device and is ejected upward, thereby further rapidly driving the flue gas to flow upward, preventing the flue gas from flowing directly in the direction of the first exhaust pipe, thereby reducing the cooling speed and generating dioxins.

[0018] Preferably, the flue gas deacidification module is provided with a first air inlet pipe connected to the first air outlet pipe, the first air inlet pipe is provided with a plurality of exhaust ports arranged along the height direction, the flue gas deacidification module is also provided with an alkali solution inlet directly opposite to the exhaust port, a valve structure is provided between the exhaust port and the alkali solution inlet, the valve structure comprises two oppositely arranged bell mouths, and a valve ball located between the two bell mouths and sealing the bell mouths, the small diameter end of one bell mouth is connected to the exhaust port, the small diameter end of the other bell mouth is connected to the alkali solution inlet, a gap is provided between the large diameter ends of the two bell mouths, and the bell mouth is also provided with a sensor in contact with the valve ball.

[0019] When this preferred solution is in use, the deacidification airflow and neutralization particles are blown onto the valve ball through the bell mouth. When the air pressure on both sides of the valve ball is the same, the deacidification airflow and the atomized alkali solution on both sides are discharged from the gap and mixed under the guidance of the valve ball, thereby deacidifying the flue gas. When the flow rate of the neutralization particles is large and the pressure on the valve ball increases, the valve ball will be pushed to block the first air inlet pipe. At this time, the sensor on the bell mouth senses the valve ball and transmits a signal to the air pump to reduce the flow rate of the neutralization particles, thereby avoiding excessive neutralization of particles. Conversely, when the valve ball is pushed to block the alkali solution inlet, the amount of neutralization particles is increased, thereby achieving self-regulation of the neutralization particles used for flue gas deacidification. Due to the instability of the air intake, the valve ball will move back and forth between the two bell mouths.

[0020] Preferably, the alkali solution inlet and the exhaust port are arranged in the transverse direction, and the flue gas deacidification module is provided with two deacidification outlets arranged in the longitudinal direction, and the deacidification outlets are connected to adsorption tubes extending to the adsorption unit.

[0021] A method for treating a flue gas treatment system adapted to a cracking reaction comprises the following steps:

[0022] a. The flue gas adapted to the cracking reaction passes through the flue gas secondary combustion, catalytic combustion device, and SCR denitration reactor and then enters the flue gas rapid cooling device for rapid cooling. The flue gas enters the smoke inlet from bottom to top through the flue gas duct, and after being separated by the smoke exhaust hole, forms a number of small streams of flue gas arranged longitudinally and flowing upward. At this time, the double-fluid spray gun in the flue gas rapid cooling device sprays atomized alkali liquid to the first exhaust pipe. The double-fluid spray gun sprays horizontally to form a negative pressure above the smoke exhaust hole. While the flue gas flows upward, it is accelerated to flow upward by the negative pressure and flows in the atomized alkali liquid. The alkali solution is driven to enter the first air outlet, and when the atomized alkali solution contacts the flue gas, the flue gas is quickly cooled. At the same time, since the alkali solution has a conical spray area when it is sprayed, the gas sprayed in the two drainage pipes is set so that the upward and downward sprayed parts also enter the horizontal airflow. At the same time, under the action of the diverter valve, a part of the flue gas entering the first air outlet pipe flows back to the flue gas rapid cooling device and sprays upward, thereby further quickly driving the flue gas to flow upward, avoiding the flue gas from flowing directly in the direction of the first air outlet pipe, thereby reducing the cooling speed and generating dioxins;

[0023] b. When the atomized alkali liquid airflow passes through the fan wheel, it drives the fan wheel to drive the shaft and cam to rotate. The rotation of the cam drives the valve plate to move up and down in the cold air inlet pipe through the piston, so as to properly adjust the air intake of the cold air inlet. In order to ensure sufficient cooling of the flue gas, the air intake will be increased. However, excessive air intake will lead to waste of air intake. Therefore, when the air intake is too large or the air intake is large due to a fault, the shaft drives the cam to rotate too fast, causing the piston to be pushed to the highest point of the cam and not yet dropped. The cam will hit the piston again, thus causing The valve plate is continuously located at the highest point, thereby continuously limiting the amount of cold air. When the amount of cold air decreases, the rotation speed of the fan wheel in the corresponding first air outlet pipe decreases, thereby reducing the rotation speed of the cam, so that the valve plate moves downward, thereby realizing self-regulation of the air intake volume. At the same time, the setting of the spring facilitates the downward movement of the piston. The setting of the oil inlet pipe facilitates the lubrication of the piston and the lubrication of the bump and the cam. The setting of the electric push rod adjusts the position of the bump. When self-regulation is not required, the electric push rod can be driven to drive the bump to move upward, so that the bump does not contact the cam.

[0024] c. The flue gas coming out of the first air outlet pipe enters the first air inlet pipe and is dispersed into a number of deacidification airflows arranged along the height direction under the dispersion of the exhaust port. The deacidification airflow and neutralization particles are blown onto the valve ball through the bell mouth. When the air pressure on both sides of the valve ball is the same, the deacidification airflow and the atomized alkali solution on both sides are discharged from the gap and mixed under the guidance of the valve ball, thereby deacidifying the flue gas. When the flow rate of the neutralization particles is large and the pressure on the valve ball increases, the valve ball will be pushed to block the first air inlet pipe. At this time, the sensor on the bell mouth senses the valve ball and transmits the signal to the air pump to reduce the flow rate of the neutralization particles, thereby avoiding excessive neutralization particles. Conversely, when the valve ball is pushed to block the alkali solution inlet, the amount of neutralization particles is increased, thereby realizing self-regulation of the neutralization particles used for flue gas deacidification. Due to the instability of the air intake, the valve ball will move back and forth between the two bell mouths.

[0025] The beneficial effects of the present invention are as follows: when the airflow atomized by alkali liquid passes through the impeller, it drives the impeller to drive the rotating shaft and the cam to rotate. The rotation of the cam drives the valve plate to move up and down in the cold air inlet pipe through the piston, so that the air intake of the cold air inlet can be properly adjusted. In order to ensure sufficient cooling of the flue gas, the air intake will be increased, but excessive air intake will lead to waste of air intake. Therefore, when the air intake is too large or the air intake is large due to a malfunction, the rotating shaft drives the cam to rotate too fast, causing the piston to be pushed to the highest point by the cam and not yet dropped. The cam then pushes onto the piston again, causing the valve plate to be continuously located at the highest point, thereby continuously limiting the cold air volume. When the cold air volume decreases, the rotation speed of the impeller in the corresponding first air outlet pipe decreases, thereby reducing the rotation speed of the cam, thereby moving the valve plate downward, thereby achieving self-regulation of the air intake volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0027] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0028] Figure 3 It is a top view schematic diagram of the flue gas deacidification module;

[0029] Figure 4 It is a top view schematic diagram of the smoke exhaust port;

[0030] Figure 5 is a right side schematic diagram of the first air intake pipe;

[0031] As shown in the figure:

[0032] 1. Dual-fluid spray gun, 2. Drainage pipe, 3. Cooling inlet pipe, 4. First air outlet pipe, 5. Diverter valve, 6. Smoke inlet pipe, 7. Flow limiting pipe, 8. Cooling box, 9. Transition pipe, 10. First air inlet pipe, 11. Deacidification box, 12. Adsorption tube, 13. Alkali solution inlet, 14. Valve plate, 15. Spring, 16. Oil inlet pipe, 17. Slide, 18. Bump, 19. Piston, 20. Electric push rod, 21. Cam, 22. Rotating shaft, 23. Bell mouth, 24. Sensor, 25. Valve ball, 26. Flow limiting port, 27. Smoke exhaust hole. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0034] See attached Figure 1-3 The present invention discloses a flue gas treatment system adapted for cracking reaction, comprising a flue gas secondary combustion device, a catalytic combustion device, an SCR denitrification reactor, a flue gas rapid cooling device, a flue gas deacidification module, an adsorption unit, a bag dust removal system, and an ash treatment system which are arranged in sequence.

[0035] The flue gas secondary combustion device is the first treatment, which makes the combustible components and unburned harmful substances in the flue gas produced by cracking completely burn and decompose thoroughly.

[0036] The catalytic combustion device places a catalytic combustion reactor on the top of the flue gas secondary combustion device gas collection hood, which is mainly used to remove excess carbon monoxide discharged from the secondary combustion device.

[0037] The SCR denitrification reactor adopts the selective catalytic reduction denitrification method. The catalyst is loaded in a fixed cylinder. The ammonia in the external ammonia cylinder is mixed with the flue gas and enters the pipeline heater, where a reaction occurs at 200~350℃ to remove nitrogen oxides.

[0038] The adsorption unit uses activated carbon to be sprayed into the flue in front of the bag filter through an injection device, and is fully mixed with the flue gas through the flue. When the flue gas flows to the bag filter downstream, the activated carbon adsorbs heavy metals and dioxins in the flue gas and enters the bag filter in a suspended state.

[0039] The bag dust removal system is composed of bag dust collector, compressed air backflush, detection and control systems. The flue gas enters the dust collector through the flue, and enters each room of the dust collector evenly through the guide device. The coarser dust particles sink into the ash hopper under the action of their own weight and the impact with the guide plate, and are discharged through the ash discharge device at the bottom of the dust collector. The flue gas is then discharged from the chimney through the exhaust fan and into the main air outlet pipe.

[0040] The ash handling system is used to automatically discharge the slag produced during the cracking process from the cracking bin under the action of a spiral slag discharger.

[0041] The arrangement of a flue gas secondary combustion device, a catalytic combustion device, an SCR denitrification reactor, a flue gas rapid cooling device, a flue gas deacidification module, an adsorption unit, a bag dust removal system, and an ash treatment system realizes multi-stage treatment of flue gas, among which the flue gas secondary combustion device, the catalytic combustion device, the SCR denitrification reactor, the adsorption unit, the bag dust removal system, and the ash treatment system are all existing technologies.

[0042] The smoke rapid cooling device comprises a cooling box 8, to which is connected a first air outlet pipe 4 extending transversely and a smoke inlet pipe 6 extending in height. A plurality of dual-fluid spray guns 1 are also arranged in the box, and the dual-fluid spray guns are prior art.

[0043] A longitudinally extending rotating shaft 22 is axially connected to the first air outlet pipe 4, and a plurality of impellers arranged along its axial direction are fixedly connected to the rotating shaft 22. A cam 21 located on the outer side of the first air outlet pipe 4 is fixedly connected to the rotating shaft 22. The upper end of the cam 21 contacts and connects a piston 19 that slides in a slide cylinder 17 along a height direction. A valve plate 14 that extends upward and slides in a height direction in a cold air inlet pipe is fixedly connected to the top surface of the piston 19. The cooling inlet pipe 3 is connected to the cold air inlet of the dual-fluid spray gun 1.

[0044] A spring 15 is also provided in the slide 17 to drive the piston 19 to move downward. The bottom end of the piston 19 is connected to an electric push rod 20. The bottom end of the electric push rod 20 is fixedly connected to a protrusion 18 that is in contact with the cam 21. The contact surface between the protrusion 18 and the cam 21 is an arc surface. The slide 17 is also connected to an oil inlet pipe 16.

[0045] A smoke inlet is also provided in the cooling box 8, which is located between the dual-fluid spray gun 1 and the first exhaust pipe 4 and below the cooling gas. The smoke inlet is connected to the smoke inlet pipe 6, and the smoke inlet extends longitudinally. The smoke inlet is provided with a plurality of smoke exhaust holes 27 extending longitudinally and for the smoke to flow upward. The dual-fluid spray guns 1 are arranged longitudinally in sequence, and the longitudinal arrangement of the smoke exhaust holes 27 facilitates increasing the contact area between the atomized alkali solution and the smoke, thereby achieving a better cooling effect.

[0046] The cooling box 8 is further provided with drainage pipes 2 located at the upper and lower ends of the dual-fluid spray gun 1 .

[0047] The smoke inlet is also connected to a flow limiting port 26 that is located between the first air outlet pipe 4 and the smoke inlet and ejects air upward. The flow limiting port 26 is connected to a diverter valve 5 through a flow limiting tube 7. The diverter valve 5 is arranged on the first air outlet pipe 4, and an air pump is provided on the flow limiting tube 7.

[0048] The flue gas deacidification module includes a deacidification box 11, to which is connected a first air inlet pipe 10 and an alkali solution inlet 13 extending laterally and oppositely, as well as two deacidification outlets extending longitudinally and arranged longitudinally. The deacidification outlet is connected to an adsorption tube 12 extending toward the adsorption unit, and a mixing blade is provided inside the adsorption tube 12.

[0049] The first air inlet pipe 10 is connected to the first air outlet pipe 4 through a transition pipe 9. The transition pipe 9 is a circular pipe. The first air inlet pipe 10 extends in the height direction. The first air inlet pipe 10 is provided with a plurality of exhaust ports arranged in the height direction. An alkali liquid inlet 13 opposite to the exhaust port is also provided in the flue gas deacidification module. A valve structure is provided between the exhaust port and the alkali liquid inlet 13. The valve structure includes two relatively arranged bell mouths 23, and a valve ball 25 located between the two bell mouths 23 and sealing the bell mouths 23. The small diameter end of one bell mouth 23 is connected to the exhaust port, and the small diameter end of the other bell mouth 23 is connected to the alkali liquid inlet 13. A gap is provided between the large diameter ends of the two bell mouths 23. The bell mouth 23 is also provided with a sensor 24 in contact with the valve ball 25. The exhaust ports are arranged in the height direction to facilitate the longitudinal flow of the gas-solid mixture.

[0050] A method for treating a flue gas treatment system adapted to a cracking reaction comprises the following steps:

[0051] a. The flue gas adapted to the cracking reaction passes through the flue gas secondary combustion, catalytic combustion device, and SCR denitration reactor and then enters the flue gas rapid cooling device for rapid cooling. The flue gas enters the smoke inlet from bottom to top through the flue gas duct and is separated by the smoke exhaust hole 27 to form a number of small streams of flue gas arranged longitudinally and flowing upward. At this time, the double-fluid spray gun 1 in the flue gas rapid cooling device sprays atomized alkali liquid to the first air outlet pipe 4. The double-fluid spray gun 1 sprays horizontally to form a negative pressure above the smoke exhaust hole 27. The flue gas is accelerated to flow upward by the negative pressure while flowing upward, and is accelerated by the negative pressure in the atomized alkali liquid. The alkali liquid is driven to enter the first air outlet, and when the atomized alkali liquid contacts the flue gas, the flue gas is quickly cooled. At the same time, since the alkali liquid has a conical spray area when it is sprayed, the gas sprayed in the two drainage pipes 2 is set so that the upward and downward sprayed parts also enter the horizontal airflow. At the same time, under the action of the diverter valve 5, a part of the flue gas entering the first air outlet pipe 4 flows back to the flue gas rapid cooling device and sprays upward, thereby further quickly driving the flue gas to flow upward, avoiding the flue gas from flowing directly in the direction of the first air outlet pipe 4, thereby reducing the cooling speed and generating dioxins;

[0052] b. When the atomized alkaline liquid airflow passes through the impeller, it drives the impeller to drive the shaft 22 and the cam 21 to rotate. The rotation of the cam 21 drives the valve plate 14 to move up and down in the cold air inlet pipe through the piston 19, so that the air intake of the cold air inlet can be properly adjusted. In order to ensure sufficient cooling of the flue gas, the air intake will be increased, but too much air intake will lead to waste of air intake. Therefore, when the air intake is too large or the air intake is large due to a fault, the shaft 22 drives the cam 21 to rotate too fast, causing the piston 19 to be pushed to the highest point when the cam 21 is pushed to the piston 19 again before it falls, so that the valve plate 14 is held. The valve 14 is continuously located at the highest point, thereby continuously limiting the amount of cold air. When the amount of cold air decreases, the rotation speed of the fan wheel in the corresponding first air outlet pipe 4 decreases, thereby reducing the rotation speed of the cam 21, so that the valve plate 14 moves downward, thereby realizing self-regulation of the air intake volume. At the same time, the setting of the spring 15 facilitates the downward movement of the piston 19. The setting of the oil inlet pipe 16 facilitates the lubrication of the piston 19, and also facilitates the lubrication of the protrusion 18 and the cam 21. The setting of the electric push rod 20 adjusts the position of the protrusion 18. When self-regulation is not required, the electric push rod 20 can be driven to drive the protrusion 18 to move upward, so that the protrusion 18 does not contact the cam 21.

[0053] c. The flue gas coming out of the first air outlet pipe 4 enters the first air inlet pipe 10, and is dispersed into a plurality of deacidification airflows arranged in the height direction under the dispersion of the exhaust port. The deacidification airflow and the neutralization particles are blown onto the valve ball 25 through the bell mouth 23. When the air pressure on both sides of the valve ball 25 is the same, the deacidification airflow and the atomized alkali solution on both sides are discharged from the gap and mixed under the guidance of the valve ball 25, so as to deacidify the flue gas. When the flow rate of the neutralization particles is large and the pressure on the valve ball 25 increases, the valve ball 25 will be pushed to block the first air inlet pipe 10. At this time, the sensor 24 on the bell mouth 23 senses the valve ball 25 and transmits a signal to the air pump to reduce the flow rate of the neutralization particles, thereby avoiding excessive neutralization particles. On the contrary, when the valve ball 25 is pushed to block the alkali solution inlet 13, the amount of the neutralization particles is increased, so that the neutralization particles used for flue gas deacidification can be self-regulated. Due to the instability of the air intake, the valve ball 25 will move back and forth between the two bell mouths 23.

[0054] Excess neutralizing particles will remain in the adsorption unit. The neutralizing particles are lime powder, which is sprayed in by high-pressure air. The gas and solid phases meet, resulting in high turbulence and gas-solid mixing, so that the acid gas in the flue gas can fully contact and react with the lime powder, thereby removing the acid gas. A temperature sensor is also provided in the first outlet pipe 4.

[0055] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A flue gas treatment system adapted to cracking reaction, characterized in that: The invention comprises a flue gas secondary combustion device, a catalytic combustion device, an SCR denitration reactor, a flue gas rapid cooling device, a flue gas deacidification module, an adsorption unit, a bag dust removal system, and an ash treatment system, wherein a first outlet pipe (4) of the flue gas rapid cooling device is internally connected to a longitudinally extending rotating shaft (22), a plurality of impellers arranged along its axial direction are fixedly connected to the rotating shaft (22), a cam (21) located outside the first outlet pipe (4) is fixedly connected to the rotating shaft (22), the upper end of the cam (21) is in contact with a piston (19) sliding in a slide cylinder (17) in a height direction, a valve plate (14) extending upward and sliding in a height direction in a cooling inlet pipe (3) is fixedly connected to the top surface of the piston (19), and the cooling inlet pipe (3) is connected to a cold air inlet of a dual-fluid spray gun (1); The slide cylinder (17) is further provided with a spring (15) for driving the piston (19) to move downward; The bottom end of the piston (19) is connected to an electric push rod (20), the bottom end of the electric push rod (20) is fixedly connected to a convex block (18) in contact with the cam (21), and the contact surface between the convex block (18) and the cam (21) is an arc surface; The slide cylinder (17) is also connected to an oil inlet pipe (16); The smoke rapid cooling device is also provided with a smoke inlet located between the dual-fluid spray gun (1) and the first exhaust pipe (4) and below the cooling inlet pipe (3), the smoke inlet being connected to the smoke inlet pipe (6), the smoke inlet extending in the longitudinal direction, and having a plurality of smoke exhaust holes (27) extending in the longitudinal direction and allowing the smoke to flow upward, the dual-fluid spray guns (1) being arranged in sequence in the longitudinal direction; The smoke rapid cooling device is also provided with drainage pipes (2) located at the upper and lower ends of the dual-fluid spray gun (1); The smoke inlet is also connected to a flow limiting port (26) located between the first air outlet pipe (4) and the smoke inlet and ejecting air upwards. The flow limiting port (26) is connected to a flow diverter valve (5) via a flow limiting pipe (7). The flow diverter valve (5) is arranged on the first air outlet pipe (4).

2. The flue gas treatment system adapted for cracking reaction according to claim 1, characterized in that: The flue gas deacidification module is provided with a first air inlet pipe (10) connected to the first air outlet pipe (4), the first air inlet pipe (10) is provided with a plurality of exhaust ports arranged in a height direction, the flue gas deacidification module is also provided with an alkali liquid inlet (13) directly opposite to the exhaust port, a valve structure is provided between the exhaust port and the alkali liquid inlet (13), the valve structure comprises two bell mouths (23) arranged opposite to each other, and a valve ball (25) located between the two bell mouths (23) and sealing the bell mouths (23), the small diameter end of one bell mouth (23) is connected to the exhaust port, the small diameter end of the other bell mouth (23) is connected to the alkali liquid inlet (13), a gap is provided between the large diameter ends of the two bell mouths (23), and a sensor (24) in contact with the valve ball (25) is also provided on the bell mouth (23).

3. The flue gas treatment system adapted for cracking reaction according to claim 2, characterized in that: The alkali solution inlet (13) and the exhaust port are arranged in the transverse direction, and the box body of the flue gas deacidification module is provided with two deacidification outlets arranged in the longitudinal direction, and the deacidification outlets are connected to adsorption tubes (12) extending toward the adsorption unit.

4. The method for treating a flue gas treatment system adapted to a cracking reaction according to claim 3, characterized in that: The following steps are involved: a. The flue gas from the cracking reaction passes through the flue gas secondary combustion, the catalytic combustion device, and the SCR denitration reactor, and then enters the flue gas rapid cooling device for rapid cooling. The flue gas enters the flue gas inlet from bottom to top through the flue gas inlet pipe (6), and after being separated by the flue gas exhaust hole (27), forms a plurality of small streams of flue gas arranged in the longitudinal direction and flowing upward. At this time, the double-fluid spray gun (1) in the flue gas rapid cooling device sprays atomized alkali liquid toward the first gas outlet pipe (4). The double-fluid spray gun (1) sprays in the transverse direction, forming a negative pressure above the flue gas exhaust hole (27). The flue gas is accelerated to flow upward by the negative pressure while flowing upward, and is formed in the mist. The atomized alkali liquid is driven to enter the first air outlet pipe (4). When the atomized alkali liquid contacts the flue gas, the flue gas is rapidly cooled. At the same time, since the alkali liquid has a conical spray area when it is sprayed, the gas sprayed in the two drainage pipes (2) is arranged so that the upward sprayed and downward sprayed parts also enter the horizontal air flow. At the same time, under the action of the diverter valve (5), a part of the flue gas entering the first air outlet pipe (4) flows back to the flue gas rapid cooling device and sprays upward, thereby further rapidly driving the flue gas to flow upward, preventing the flue gas from flowing directly in the direction of the first air outlet pipe (4), reducing the cooling speed, and generating dioxins. b. When the atomized alkaline liquid airflow passes through the impeller, it drives the impeller and thus drives the rotating shaft (22) and the cam (21) to rotate. The rotation of the cam (21) drives the valve plate (14) to move up and down in the cooling inlet pipe (3) through the piston (19), thereby being able to properly adjust the air intake of the cold air inlet. In order to ensure sufficient cooling of the flue gas, the air intake is increased. However, excessive air intake will lead to waste of air intake. Therefore, when the air intake is too large or the air intake is large due to a fault, the rotating shaft (22) drives the cam (21) to rotate too fast, causing the piston (19) to be pushed to the highest point on the cam (21) and not yet descending. The cam (21) then pushes against the piston (19) again, causing the valve plate (14) to remain in the state of being moved. The valve (14) is continuously located at the highest point, thereby continuously limiting the amount of cold air. When the amount of cold air decreases, the rotation speed of the fan wheel in the corresponding first air outlet pipe (4) decreases, thereby reducing the rotation speed of the cam (21), thereby causing the valve plate (14) to move downward, thereby achieving self-regulation of the amount of air intake. At the same time, the spring (15) is arranged to facilitate the piston (19) to move downward. The oil inlet pipe (16) is arranged to facilitate lubrication of the piston (19) and lubrication of the protrusion (18) and the cam (21). The electric push rod (20) is arranged to adjust the position of the protrusion (18). When self-regulation is not required, the electric push rod (20) is driven to drive the protrusion (18) to move upward, thereby preventing the protrusion (18) from contacting the cam (21). c. The flue gas from the first air outlet pipe (4) enters the first air inlet pipe (10) and is dispersed into a plurality of deacidified air flows arranged in the height direction under the dispersion of the exhaust port. The deacidified air flow and the neutralized particles are blown onto the valve ball (25) through the bell mouth (23). When the air pressure on both sides of the valve ball (25) is the same, the deacidified air flow and the neutralized particles are discharged and mixed from the gaps on both sides under the guidance of the valve ball (25), thereby deacidifying the flue gas. When the flow rate of the neutralized particles is large and the pressure on the valve ball (25) increases, the valve ball (25) ) will be pushed to block the first air inlet (10). At this time, the sensor (24) on the bell mouth (23) senses the valve ball (25) and transmits a signal to the air pump, thereby reducing the flow of neutralized particles, thereby avoiding excessive neutralization of particles. Conversely, when the valve ball (25) is pushed to block the alkali solution inlet (13), the amount of neutralized particles is increased, thereby achieving self-regulation of the neutralized particles used for flue gas deacidification. Due to the instability of the air intake, the valve ball (25) will move back and forth between the two bell mouths (23).

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