Low-temperature methanol washing rto tail gas treatment device adopting self-circulation gas-cooled double valve plate butterfly valve

Abstract

The application discloses a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulation gas cooling double-valve-plate butterfly valve, and relates to the technical field of waste gas treatment. By arranging the condensation and impurity removal mechanism, when the coal waste gas passes through the inside of one of the condensation components, the low-temperature tail gas cleaned by the low-temperature methanol washing mechanism can flow through the plurality of heat exchange pipes in the condensation component at the same time, so that the temperature of the outer wall of the heat exchange pipe is rapidly reduced to below zero degree, and the flowing coal tar gas and water vapor can be rapidly cooled and condensed after contacting the outer wall of the low-temperature heat exchange pipe, so that the coal tar gas and water vapor are separated from the tail gas. In the process, the cold source used comes from the tail gas generated by the low-temperature methanol washing mechanism, and the cold source which cannot be utilized and will affect the subsequent RTO furnace treatment is ingeniously used for separating the coal tar and water vapor in the waste gas. No refrigeration device needs to be separately arranged for the cooling and condensation process of the coal tar and water vapor, and the purpose of energy saving and emission reduction is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, in particular to a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulating air-cooled double-valve-plate butterfly valve. BACKGROUND

[0002] In the production process of coal gas, raw coal and oxygen undergo chemical reaction in the gasifier, which generates carbon dioxide (CO2) gas. Subsequently, in the methanol regeneration link of low-temperature methanol washing, CO2 needs to be treated by nitrogen stripping process, and then removed by low-temperature methanol absorption to remove sulfides, and finally discharged. After low-temperature methanol washing treatment, there are still trace amounts of CO, H2 and methanol components in the tail gas, accompanied by a small amount of nitrogen. Usually, these tail gases are first washed with water to recover the methanol therein, and then directly discharged into the atmosphere. However, it is worth noting that the tail gas after water washing still contains a high concentration of flammable gas and volatile organic compounds (VOCs), which poses certain environmental risks and resource waste hazards.

[0003] Referring to the patent application with publication number CN207132358U, a device for treating anthraquinone tail gas by RTO furnace is disclosed. The device has simple structure, convenient to use, safe and reliable, can effectively improve the utilization efficiency of energy, reduce environmental pollution, and save production cost.

[0004] The RTO furnace tail gas device in the above prior art has the following defects in actual use:

[0005] When raw coal and oxygen undergo chemical reaction in the gasifier, solid particles, coal tar, water vapor and other impurities generated in the gasifier enter the low-temperature methanol washing system with the raw gas. Since coal tar and water vapor are prone to condensation in a low-temperature state, they are easily condensed and attached to the internal pipes or heat exchangers of the low-temperature methanol washing system, not only causing pipe blockage, but also hindering the heat exchange between the heat exchanger and the surrounding waste gas, resulting in a decrease in heat exchange efficiency and adversely affecting the subsequent treatment of the tail gas.

[0006] Therefore, the present application proposes a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulating air-cooled double-valve-plate butterfly valve to solve the above problems. SUMMARY

[0007] In view of the deficiencies of the prior art, the present application provides a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulating air-cooled double-valve-plate butterfly valve, which solves the problem that the raw gas containing solid particles, coal tar, water vapor and other impurities generated in the gasifier enters the low-temperature methanol washing system and is easily condensed and attached to the internal pipes or heat exchangers thereof, not only causing pipe blockage, but also hindering the heat exchange between the heat exchanger and the surrounding waste gas, resulting in a decrease in heat exchange efficiency and adversely affecting the subsequent treatment of the tail gas.

[0008] To achieve the above object, the present application is realized by the following technical solutions: the low-temperature methanol washing RTO tail gas treatment device adopts a self-circulating gas-cooled double-valve-plate butterfly valve, the low-temperature methanol washing RTO tail gas treatment device adopts a self-circulating gas-cooled double-valve-plate butterfly valve, comprising an RTO furnace, a fan and a low-temperature methanol washing mechanism, further comprising:

[0009] The tail gas storage mechanism comprises a high-pressure storage tank and a low-pressure storage tank arranged on the ground and connected by a pipeline, an electromagnetic valve is fixedly arranged in the pipeline, and a gas pressure sensor and a controller are fixedly arranged on the outer wall of the low-pressure storage tank, the gas pressure sensor is used to monitor the gas pressure in the low-pressure storage tank in real time and transmit the gas pressure signal to the controller;

[0010] The exhaust gas pretreatment mechanism is arranged between the low-temperature methanol washing mechanism and the low-pressure storage tank, is used to filter solid particle impurities in the coal waste gas, and simultaneously condenses the tail gas discharged by the low-temperature methanol washing mechanism with the self-circulating gas-cooled double-valve-plate butterfly valve to clean out the coal tar and water vapor in the tail gas;

[0011] The exhaust gas input pipe is arranged between the low-pressure storage tank and the exhaust gas pretreatment mechanism, is used to transport the coal waste gas in the low-pressure storage tank to the exhaust gas pretreatment mechanism, a low-temperature methanol washing tail gas first conveying pipe is arranged between the exhaust gas pretreatment mechanism and the low-temperature methanol washing mechanism, is used to convey the tail gas after low-temperature methanol washing to the exhaust gas pretreatment mechanism as a refrigerant to solidify the coal tar and water vapor in the coal waste gas, and a low-temperature methanol washing tail gas second conveying pipe is used to convey the tail gas after temperature rise to the RTO furnace;

[0012] The high-temperature exhaust gas output pipe is arranged between the exhaust gas pretreatment mechanism and the RTO furnace, is used to convey the high-temperature exhaust gas after RTO furnace treatment to the exhaust gas pretreatment mechanism through the high-temperature exhaust gas output pipe to melt the solidified coal tar and water vapor.

[0013] Further, the exhaust gas pretreatment mechanism comprises a waste residue cleaning mechanism and a condensation impurity removal mechanism, the waste residue cleaning mechanism and the condensation impurity removal mechanism are internally communicated with each other, the coal waste gas after condensation impurity removal is directly input to the waste residue cleaning mechanism to perform a solid particle impurity cleaning operation.

[0014] Further, the waste residue cleaning mechanism comprises a first exhaust treatment cylinder and a connecting pipe fixedly arranged on the side wall of the first exhaust treatment cylinder, a filter cylinder is fixedly arranged in the first exhaust treatment cylinder, a gap is formed between the outer wall of the filter cylinder and the inner wall of the first exhaust treatment cylinder, support rings are fixedly sleeved on both sides of the outer wall of the filter cylinder and in the gap, the outer wall of each support ring is fixedly arranged on the inner wall of the first exhaust treatment cylinder, a plurality of exhaust ports are uniformly arranged on the outer wall of the support ring away from the condensation and impurity removal mechanism, a plurality of filter hole areas are uniformly arranged on the outer wall of the filter cylinder, a blowback component for preventing blockage is arranged on one side of each filter hole area, and a second collecting box for collecting waste residues is detachably arranged in the long strip-shaped chip removal opening in the bottom of the first exhaust treatment cylinder.

[0015] Further, the blowback component comprises a hollow arc-shaped plate fixedly arranged in the gap, a plurality of nozzles for spraying air to the filter hole area are uniformly arranged on the side wall of the hollow arc-shaped plate close to the filter hole area, a gas cylinder is fixedly arranged below the hollow arc-shaped plate and in the filter cylinder, a piston is sealingly and slidably arranged in the gas cylinder, a push rod is fixedly arranged on the side wall of the piston and slidably penetrates the gas cylinder and extends to the outside, a spring is movably arranged between the piston and the inner wall of the gas cylinder, and an air suction pipe and a blowback pipe are fixedly arranged on one end and the side wall of the gas cylinder, respectively, and communicate with the inside of the gas cylinder, a second one-way valve allowing only gas to flow into the hollow arc-shaped plate is fixedly arranged in the blowback pipe, and a third one-way valve allowing only gas to flow into the gas cylinder is fixedly arranged in the air suction pipe.

[0016] Further, the condensation and impurity removal mechanism comprises a second exhaust treatment cylinder and a servo motor fixedly arranged at one end of the second exhaust treatment cylinder, a transmission shaft is rotatably arranged in the second exhaust treatment cylinder, the output shaft of the servo motor is fixedly connected with the transmission shaft, and a plurality of condensation components are uniformly arranged on the outer wall of the transmission shaft.

[0017] Further, the outer wall of the second exhaust treatment cylinder is provided with a first inlet and a first outlet for low-temperature methanol wash tail gas input and output at the uppermost two sides, respectively, the first inlet and the first outlet are connected with a low-temperature methanol wash tail gas first conveying pipe and a low-temperature methanol wash tail gas second conveying pipe, respectively, the outer wall of the second exhaust treatment cylinder is provided with a second inlet and a second outlet at the lowermost two sides, respectively, the second inlet and the second outlet are connected with a high-temperature waste gas output pipe and a low-temperature waste gas output pipe, respectively, and a waste liquid discharge port is arranged in the bottom of the second exhaust treatment cylinder, and a first collecting box is detachably arranged in the waste liquid discharge port.

[0018] Further, the condensing assembly comprises a bearing seat fixedly arranged on the outer wall of the transmission shaft, an installation cavity is formed in the bearing seat, a first hollow vertical plate and a second hollow vertical plate are fixedly arranged on the two sides of the installation cavity, a first docking hole is formed in the top middle position of the first hollow vertical plate, and an exhaust pipe is fixedly arranged in the first hollow vertical plate, and a first one-way valve is fixedly arranged in the exhaust pipe.

[0019] Further, a second docking hole is formed in the top middle position of the second hollow vertical plate, and an air inlet pipe is fixedly arranged in the second hollow vertical plate, a plurality of support plates are fixedly arranged in the bearing seat and between the second hollow vertical plate and the first hollow vertical plate, a plurality of heat exchange pipes are fixedly arranged in the support plates, the two ends of the plurality of heat exchange pipes are connected with the interiors of the first hollow vertical plate and the second hollow vertical plate respectively, and a plurality of through holes are formed in the outer wall of the support plate.

[0020] Further, the outer wall of the high-pressure storage tank is fixedly provided with a coal waste gas input pipe for conveying coal waste gas into the high-pressure storage tank through an external booster pump, and a pressure sensor is arranged in the high-pressure storage tank to monitor the pressure of the high-pressure storage tank in real time, the data monitored by the pressure sensor is transmitted to the booster pump in real time, and the booster pump controls the air pressure in the high-pressure storage tank to be a set value in real time through the internal microcomputer.

[0021] The application provides a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulating air-cooled double-valve-plate butterfly valve.

[0022] 1. The low-temperature methanol washing RTO tail gas treatment device adopting a self-circulating air-cooled double-valve-plate butterfly valve, by arranging a condensing and impurity removing mechanism composed of a plurality of condensing assemblies, when coal waste gas passes through the interior of one of the condensing assemblies, low-temperature tail gas cleaned by the low-temperature methanol washing mechanism can flow through a plurality of heat exchange pipes in the condensing assemblies at the same time, so that the temperature of the outer wall of the heat exchange pipes is rapidly reduced to below zero degrees, and the flowing coal tar gas and water vapor can be rapidly cooled and condensed after contacting the outer wall of the low-temperature heat exchange pipes, so that the coal tar gas and water vapor are separated from the tail gas, the cold source used in the process comes from the tail gas generated by the low-temperature methanol washing mechanism, and the cold source that cannot be utilized and affects the subsequent RTO furnace treatment is ingeniously used for separating coal tar and water vapor from the waste gas, so that a refrigeration device does not need to be separately arranged for the cooling and condensation process of the coal tar and water vapor, the purpose of energy saving and emission reduction is achieved, and the temperature of the low-temperature tail gas after heat exchange can rapidly rise, so that the temperature of the tail gas input into the RTO furnace is already in a relatively high state, thereby accelerating the preheating speed of the tail gas in the RTO furnace, so as to avoid the problem that the preheating of the tail gas is insufficient and the combustion efficiency is affected.

[0023] 2. The low-temperature methanol washing RTO tail gas treatment device with self-circulating air-cooled double valve plate butterfly valve, by using a servo motor to intermittently drive multiple condensing components to reciprocate and exchange positions, the condensing components that have been cleaned of coal tar and water vapor adhesion on the surface can be transferred from the uppermost position to the lowermost position after exchanging positions, the condensing components can be automatically docked with the high-temperature waste gas output pipe and the low-temperature waste gas output pipe after rotating to the lowermost position, after the high-temperature waste gas treated by the RTO furnace enters the condensing component at the lowermost position, the high-temperature waste gas flows through multiple heat exchange pipes and heats the heat exchange pipes, the coal tar and water vapor solids solidified on the surface of the heat exchange pipes quickly melt after being heated, and can drop into the No. 1 collection box under the action of gravity, realizing the effect of automatically cleaning the adhesion on the surface of the condensing component, without manual cleaning, reducing the labor intensity, realizing the purpose of automatically separating the coal tar and water vapor in the coal waste gas, avoiding the problem that the coal tar and water vapor block the pipeline in the low-temperature methanol washing mechanism and affect the work of the heat exchanger, and also avoiding the problem that the high-temperature waste gas after combustion affects the surrounding environment due to the high temperature.

[0024] 3. The low-temperature methanol washing RTO tail gas treatment device with self-circulating air-cooled double valve plate butterfly valve, by setting the waste residue cleaning mechanism, it can filter out the solid particle impurities in the waste gas after condensation and impurity removal again, avoid dust particles from entering the low-temperature methanol washing mechanism to affect the cleaning process, and also drive the disc to rotate by the power during the switching of the condensing component, so as to drive the blowback component to perform blowing operation by the arc-shaped protrusion, so that the blowback components at different positions can work reciprocally and alternately, the air blown out by the blowback component can blow away the dust attached to the filter hole area, realizing the purpose of preventing the filter hole area from being blocked, so as to keep the filter hole area in an efficient filtering state at all times.

[0025] 4. The low-temperature methanol washing RTO tail gas treatment device with self-circulating air-cooled double valve plate butterfly valve, by setting the high-pressure storage tank, the low-pressure storage tank, the electromagnetic valve, the air pressure sensor and the controller, it can temporarily store the externally generated coal waste gas by using the high-pressure storage tank when the external coal waste gas input is too much, and can continuously transport the waste gas to the low-pressure storage tank by using the stored waste gas when the external coal waste gas input is less, and the low-pressure storage tank can always maintain a relatively stable waste gas pressure state by using the air pressure sensor, so as to ensure that the amount of coal waste gas input into the RTO furnace is in a relatively stable state, so as to prevent the heat storage body in the RTO furnace from not being able to heat the waste gas sufficiently when the amount of waste gas is too large, causing the temperature of the combustion chamber to fluctuate and affecting the efficiency of organic matter oxidation and decomposition, and also preventing the heat storage body from not being able to release heat sufficiently when the amount of waste gas is too small, causing the heat efficiency to decrease, part of the heat to be discharged with the tail gas, and the energy consumption to rise. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the first overall three-dimensional structure schematic diagram of the application;

[0027] Figure 2 is a second overall structure schematic diagram of the present application;

[0028] Figure 3 is a sectional structure schematic diagram of the exhaust gas pretreatment mechanism of the present application;

[0029] Figure 4 is an enlarged structure schematic diagram of part A in the present application Figure 3

[0030] Figure 5 is an enlarged structure schematic diagram of part B in the present application Figure 3

[0031] Figure 6 is an enlarged structure schematic diagram of part C in the present application Figure 3

[0032] Figure 7 is an enlarged structure schematic diagram of part D in the present application Figure 3

[0033] Figure 8 is a first exploded state structure schematic diagram of the exhaust gas pretreatment mechanism of the present application;

[0034] Figure 9 is a second exploded state structure schematic diagram of the exhaust gas pretreatment mechanism of the present application;

[0035] Figure 10 is an enlarged structure schematic diagram of part E in the present application Figure 3

[0036] Figure 11 is a sectional structure schematic diagram of the backflush assembly of the present application;

[0037] Figure 12 is an exploded state structure schematic diagram of the condensing and impurity removing mechanism of the present application for removing the second exhaust gas treatment cylinder;

[0038] Figure 13 is a sectional structure schematic diagram of the condensing and impurity removing mechanism of the present application;

[0039] Figure 14 is a sectional structure schematic diagram of the condensing assembly of the present application.

[0040] ​​​​​In the figure: 1, RTO furnace; 2, fan; 3, low-temperature methanol washing mechanism; 4, high-pressure storage tank; 5, low-pressure storage tank; 6, electromagnetic valve; 7, air pressure sensor; 8, controller; 9, waste gas pretreatment mechanism; 91, No. 1 tail gas treatment cylinder; 92, condensation impurity removal mechanism; 921, No. 2 tail gas treatment cylinder; 922, transmission shaft; 923, condensation assembly; 9231, bearing seat; 9232, first hollow vertical plate; 9233, second hollow vertical plate; 9234, first butt joint hole; 9235, exhaust pipe; 9236, first one-way valve; 9237, second butt joint hole; 9238, air inlet pipe; 9239, support plate; 9230, heat exchange pipe; 924, disc; 925, arc-shaped protrusion; 926, servo motor; 927, No. 1 collection box; 93, connecting pipe; 94, filter cylinder; 95, filter hole area; 96, back flushing assembly; 961, hollow arc-shaped plate; 962, air cylinder; 963, piston; 964, push rod; 965, spring; 966, air suction pipe; 967, back flushing pipe; 968, second one-way valve; 969, third one-way valve; 97, long strip-shaped chip removal opening; 98, No. 2 collection box; 99, support ring; 910, exhaust port; 10, waste gas input pipe; 11, low-temperature methanol washing tail gas first conveying pipe; 12, low-temperature methanol washing tail gas second conveying pipe; 13, high-temperature waste gas output pipe; 14, low-temperature waste gas output pipe. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] The present application provides two technical solutions: a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulation gas-cooled double-valve-plate butterfly valve, specifically including the following embodiments:

[0043] As Figures 1-10 The first embodiment is shown: a low-temperature methanol washing RTO tail gas treatment device adopting a self-circulation gas-cooled double-valve-plate butterfly valve, including an RTO furnace 1, a fan 2 and a low-temperature methanol washing mechanism 3, the output end of the fan 2 is connected with the air inlet end of the RTO furnace 1 through a first pipeline, the input end of the fan 2 is connected with the low-temperature methanol washing tail gas second conveying pipe 12, the air inlet on the outer wall of the low-temperature methanol washing mechanism 3 is connected with the waste gas pretreatment mechanism 9 through a second pipeline, and the high-temperature waste gas output pipe 13 is connected with the waste gas output end of the RTO furnace 1. Further including:

[0044] The tail gas storage mechanism comprises a high-pressure storage tank 4 and a low-pressure storage tank 5 arranged on the ground and connected by a pipeline, an electromagnetic valve 6 is fixedly arranged in the pipeline, and a gas pressure sensor 7 and a controller 8 are fixedly arranged on the outer wall of the low-pressure storage tank 5 respectively, the gas pressure sensor 7 is used for monitoring the gas pressure in the low-pressure storage tank 5 in real time and transmitting the gas pressure signal to the controller 8;

[0045] The waste gas pretreatment mechanism 9 is arranged between the low-temperature methanol washing mechanism 3 and the low-pressure storage tank 5, is used for filtering solid particle impurities in the coal waste gas, and simultaneously performs condensation treatment on the tail gas discharged by the low-temperature methanol washing mechanism 3 adopting the self-circulation gas cooling double-valve-plate butterfly valve, so as to clean out the coal tar and water vapor in the tail gas.

[0046] The self-circulation gas cooling double-valve-plate butterfly valve adopts a two-valve-plate structure, compared with a traditional single-valve-plate butterfly valve, the sealing performance is more reliable, the friction between the valve plate and the valve seat is smaller, the valve opening and closing torque is smaller, and the valve plate wears more evenly, and the service life is longer. Through the built-in gas cooling circulation system, the inside of the valve is cooled, the heat influence of the high-temperature medium on the valve is reduced, it is suitable for high-temperature working conditions, and the risk of thermal deformation and sealing failure is reduced. It retains the basic structure of the butterfly valve, such as the valve body, the valve shaft and the valve plate, has the advantages of small size, light weight, rapid opening and closing and the like. When the self-circulation gas cooling double-valve-plate butterfly valve works, the double valve plates are driven to rotate synchronously by rotating the valve shaft, so as to realize the opening and closing of the valve. When the valve plate rotates to be perpendicular to the pipeline axis, the valve is closed; when the valve plate rotates to be parallel to the pipeline axis, the valve is completely opened. In the valve operation process, the gas cooling circulation system takes away the heat generated by the high-temperature medium, reduces the internal temperature of the valve, and ensures the stability and reliability of the valve under high-temperature working conditions.

[0047] The waste gas input pipe 10 is arranged between the low-pressure storage tank 5 and the waste gas pretreatment mechanism 9, and is used for conveying the coal waste gas in the low-pressure storage tank 5 to the waste gas pretreatment mechanism 9. The waste gas pretreatment mechanism 9 and the low-temperature methanol washing mechanism 3 are provided with a low-temperature methanol washing tail gas first conveying pipe 11, which is used for conveying the tail gas after the low-temperature methanol washing to the waste gas pretreatment mechanism 9 as a refrigerant, so as to solidify the coal tar and water vapor in the coal waste gas, and conveying the tail gas after the temperature rising to the RTO furnace 1 through a low-temperature methanol washing tail gas second conveying pipe 12.

[0048] The high-temperature waste gas output pipe 13 is arranged between the waste gas pretreatment mechanism 9 and the RTO furnace 1, and is used for conveying the high-temperature waste gas after the treatment of the RTO furnace 1 to the waste gas pretreatment mechanism 9 through the high-temperature waste gas output pipe 13, so as to melt the solidified coal tar and water vapor.

[0049] The outer wall of the high-pressure storage tank 4 is fixedly provided with a coal-based waste gas input pipe for conveying coal-based waste gas into the high-pressure storage tank 4 through an external booster pump. The high-pressure storage tank 4 is also provided with a pressure sensor for real-time monitoring of the pressure of the high-pressure storage tank 4. The data monitored by the pressure sensor is transmitted to the booster pump in real time, and the booster pump controls the air pressure inside the high-pressure storage tank 4 to be a set value in real time through the internal microcomputer.

[0050] In this embodiment, the waste gas pretreatment mechanism 9 includes a waste residue cleaning mechanism and a condensation and impurity removal mechanism 92, which are in communication with each other. The coal-based waste gas after condensation and impurity removal is directly input into the waste residue cleaning mechanism to perform solid particle impurity cleaning operation.

[0051] In this embodiment, the waste residue cleaning mechanism includes a first exhaust gas treatment cylinder 91 and a connecting pipe 93 fixedly arranged on the side wall of the first exhaust gas treatment cylinder 91. The inside of the first exhaust gas treatment cylinder 91 is fixedly provided with a filter cartridge 94. A gap is formed between the outer wall of the filter cartridge 94 and the inner wall of the first exhaust gas treatment cylinder 91. Support rings 99 are fixedly sleeved on both sides of the outer wall of the filter cartridge 94 and located in the gap. The outer wall of the support ring 99 is fixedly arranged on the inner wall of the first exhaust gas treatment cylinder 91. A plurality of exhaust ports 910 are uniformly arranged on the outer wall of the support ring 99 away from the condensation and impurity removal mechanism 92. A plurality of filter hole areas 95 are uniformly arranged on the outer wall of the filter cartridge 94. Each filter hole area 95 is provided with a blowback assembly 96 on one side for anti-clogging. A long strip-shaped chip discharge port 97 is arranged at the bottom of the first exhaust gas treatment cylinder 91. A second collection box 98 for collecting waste residue is detachably arranged in the long strip-shaped chip discharge port 97 through bolts. The two support rings 99 are used to block both ends of the gap, so that the coal-based waste gas entering the filter cartridge 94 can only enter the gap through the filter hole area 95 and be discharged through the exhaust port 910 in communication with the gap. One end of the connecting pipe 93 is in communication with the inside of the low-temperature methanol washing mechanism 3.

[0052] In the embodiment, the back flushing assembly 96 comprises a hollow arc-shaped plate 961 fixedly arranged inside the gap, a plurality of nozzles for spraying air to the filter hole area 95 are uniformly fixedly arranged on the side wall of the hollow arc-shaped plate 961 close to the filter hole area 95, a gas cylinder 962 is fixedly arranged below the hollow arc-shaped plate 961 and inside the filter cartridge 94, a piston 963 is sealingly and slidably arranged inside the gas cylinder 962, a push rod 964 is fixedly arranged on the side wall of the piston 963 and slidably penetrates through the gas cylinder 962 and extends to the outside, a spring 965 is movably arranged between the piston 963 and the inner wall of the gas cylinder 962, and an air suction pipe 966 and a back flushing pipe 967 are fixedly arranged on one end and the side wall of the gas cylinder 962 respectively and are in communication with the inside of the gas cylinder 962, a second one-way valve 968 is fixedly arranged inside the back flushing pipe 967 and only allows gas to flow into the hollow arc-shaped plate 961, and a third one-way valve 969 is fixedly arranged inside the air suction pipe 966 and only allows gas to flow into the gas cylinder 962. The top end of the air suction pipe 966 penetrates through the hollow arc-shaped plate 961 and the first exhaust gas treatment cylinder 91 and extends to the outside, one end of the back flushing pipe 967 is in communication with the inside of the hollow arc-shaped plate 961, one end of the push rod 964 is on the circumferential track when the arc-shaped protrusion 925 rotates, that is, when the arc-shaped protrusion 925 rotates circumferentially, it will meet the push rod 964 and push the push rod 964 to move a fixed distance, and the back flushing area of the hollow arc-shaped plate 961 can just cover the filter hole area 95 at the corresponding position.

[0053] As Figures 11-14 The second embodiment is shown, which is different from the first embodiment in that the condensation and impurity removal mechanism 92 comprises a second exhaust gas treatment cylinder 921 and a servo motor 926 fixedly arranged at one end of the second exhaust gas treatment cylinder 921, a transmission shaft 922 is rotatably arranged inside the second exhaust gas treatment cylinder 921, the output shaft of the servo motor 926 is fixedly connected with the transmission shaft 922, and a plurality of condensation assemblies 923 are uniformly arranged on the outer wall of the transmission shaft 922, and the outer wall of each condensation assembly 923 is sealingly and slidably connected with the inner wall of the second exhaust gas treatment cylinder 921.

[0054] In the embodiment, the outer wall of the second exhaust gas treatment cylinder 921 is provided with a first inlet and a first outlet for low-temperature methanol wash exhaust gas input and output at the uppermost two sides, the first inlet and the first outlet are connected with the low-temperature methanol wash exhaust gas first conveying pipe 11 and the low-temperature methanol wash exhaust gas second conveying pipe 12 respectively, the outer wall of the second exhaust gas treatment cylinder 921 is provided with a second inlet and a second outlet at the lowermost two sides, the second inlet and the second outlet are connected with the high-temperature exhaust gas output pipe 13 and the low-temperature exhaust gas output pipe 14 respectively, a waste liquid discharge outlet is arranged at the bottom of the second exhaust gas treatment cylinder 921, and a first collection box 927 is detachably arranged in the waste liquid discharge outlet.

[0055] In the embodiment, the condensing assembly 923 comprises a bearing seat 9231 fixedly arranged on the outer wall of the transmission shaft 922, an installation cavity is arranged in the bearing seat 9231, a first hollow vertical plate 9232 and a second hollow vertical plate 9233 are fixedly arranged on the two sides of the installation cavity respectively, a first butt joint hole 9234 is arranged at the top middle position of the first hollow vertical plate 9232, and a exhaust pipe 9235 is fixedly arranged in the first hollow vertical plate 9232, a first one-way valve 9236 is fixedly arranged in the exhaust pipe 9235, the number of the condensing assembly 923 is four, and one condensing assembly 923 is located at the uppermost and the lowermost respectively when the servo motor 926 rotates once.

[0056] In the embodiment, a second butt joint hole 9237 is arranged at the top middle position of the second hollow vertical plate 9233, and an air inlet pipe 9238 is fixedly arranged in the second hollow vertical plate 9233, a plurality of support plates 9239 are fixedly arranged in the bearing seat 9231 and between the second hollow vertical plate 9233 and the first hollow vertical plate 9232, a plurality of heat exchange pipes 9230 are fixedly arranged in the plurality of support plates 9239, the two ends of the plurality of heat exchange pipes 9230 are connected with the interiors of the first hollow vertical plate 9232 and the second hollow vertical plate 9233 respectively, a plurality of through holes are arranged on the outer wall of the support plate 9239. When the first hollow vertical plate 9232 and the second hollow vertical plate 9233 rotate synchronously with the transmission shaft 922, the arc surfaces of the first hollow vertical plate 9232 and the second hollow vertical plate 9233 are in sealing and sliding connection with the inner wall of the second exhaust treatment cylinder 921, the servo motor 926 is intermittently rotated, the intermittent time is set as 90 degrees, and when each condensing assembly 923 rotates 90 degrees, the first butt joint hole 9234 and the second butt joint hole 9237 on the two sides of the condensing assembly 923 are in sealing butt joint with the first outlet and the first inlet respectively, at the same time, the end of the air inlet pipe 9238 is in sealing sliding along the inner wall of the second exhaust treatment cylinder 921 and is in sealing butt joint with the waste gas input pipe 10, at the same time, the first butt joint hole 9234 and the second butt joint hole 9237 in the condensing assembly 923 located at the lowermost are in sealing butt joint with the second outlet and the second inlet respectively, and the end of the air inlet pipe 9238 is blocked by the inner wall of the second exhaust treatment cylinder 921.

[0057] In use, the raw coal and oxygen in the gasification furnace chemical reaction, the resulting coal waste gas through the booster pump to the high pressure storage tank 4, through the high pressure storage tank 4 provided in the pressure sensor can be real-time access to the inside of the coal waste gas pressure, gas pressure sensor 7 will low pressure storage tank 5 in the coal waste gas pressure data transmission to the controller 8, if the low pressure storage tank 5 in the gas pressure is lower than the set value, the controller 8 control solenoid valve 6 open, high pressure storage tank 4 coal waste gas through the pipeline into the low pressure storage tank 5 in the supplement, when the low pressure storage tank 5 in the gas pressure reaches the set value, the controller 8 again control solenoid valve 6 closed, so the cycle.

[0058] Into the low pressure storage tank 5 in the coal waste gas through the exhaust gas input pipe 10 and one of the condensing components 923 in the gas inlet pipe 9238 into the wall and the bearing seat 9231, the first hollow vertical plate 9232, the second hollow vertical plate 9233 composed of closed space, coal waste gas through the multiple support plate 9239 outer wall after the through hole and through the exhaust pipe 9235 into the filter cartridge 94, at the same time, in the coal waste gas through the gas inlet pipe 9238 into, previously through the exhaust gas pretreatment mechanism 9 and into the low temperature methanol washing mechanism 3 of the coal waste gas, after the low temperature methanol washing operation of the tail gas formed by the temperature sharply, the tail gas temperature is about -10 DEG C, the low temperature methanol washing tail gas from its top low temperature methanol washing tail gas first conveying pipe 11 output, then through the low temperature methanol washing tail gas first conveying pipe 11 one end into a number of entrance, because the number of entrance and condensing components 923 in the second docking hole 9237 sealing docking, therefore, the low temperature methanol washing tail gas through the number of entrance into the second hollow vertical plate 9233, and by the second hollow vertical plate 9233 distribution to the multiple heat exchange pipe 9230, in the low temperature methanol washing tail gas through the multiple heat exchange pipe 9230, coal waste gas along the heat exchange pipe 9230 outside flow, coal tar gas and water vapor in the coal waste gas encounter low temperature heat exchange pipe 9230 outer wall quickly cooled solidification, then the low temperature methanol washing tail gas all flow into the first hollow vertical plate 9232, and through the first docking hole 9234 flow out to the low temperature methanol washing tail gas second conveying pipe 12.

[0059] The fan 2 sucks the low-temperature methanol washing tail gas with the temperature raised from the second conveying pipe 12 of the low-temperature methanol washing tail gas, and inputs the tail gas into the RTO furnace 1 for combustion treatment. The high-temperature exhaust gas after the combustion of the RTO furnace 1 enters the lowermost condensing assembly 923 of the second tail gas treatment cylinder 921 through the high-temperature exhaust gas output pipe 13. The high-temperature exhaust gas enters the second hollow vertical plate 9233 through the second inlet at one end of the lowermost condensing assembly 923. When the high-temperature exhaust gas passes through the plurality of heat exchange pipes 9230, the outer wall of the heat exchange pipe 9230 is quickly heated by the high-temperature exhaust gas. The ice crystals formed by the coal tar solids and water vapor attached to the outer wall of the heat exchange pipe 9230 are gradually melted. After the coal tar and ice crystals are melted, the flowability is enhanced, and under the action of its own gravity, it drips into the first collection box 927 for storage.

[0060] The coal waste gas flows into the filter cylinder 94 through the exhaust pipe 9235, and enters the gap between the filter cylinder 94 and the first tail gas treatment cylinder 91 through the filter hole area 95. Then, the exhaust gas flows through the gap, the exhaust port 910 and the connecting pipe 93 to the low-temperature methanol washing mechanism 3 for low-temperature methanol washing treatment. After a certain interval, the servo motor 926 drives the transmission shaft 922 to rotate the plurality of condensing assemblies 923 by ninety degrees. The disc 924 rotates synchronously with the transmission shaft 922. The disc 924 drives the arc-shaped lug 925 to rotate and meet the push rod 964 at different positions and push the push rod 964 to move. While the piston 963 moves, it extrudes the air inside the air cylinder 962. The compressed air enters the hollow arc-shaped plate 961 through the back-blowing pipe 967, and is blown to the filter hole area 95 at the corresponding position through the nozzle at the bottom of the hollow arc-shaped plate 961. The dust attached to the inside of the filter hole area 95 is blown away by the high-speed airflow. The filtered dust falls into the second collection box 98 under the action of gravity.

[0061] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0062] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low-temperature methanol washing RTO tail gas treatment device using a self-circulating gas-cooled double valve plate butterfly valve, comprising an RTO furnace, a fan and a low-temperature methanol washing mechanism, characterized in that, Also include: Tail gas storage mechanism, including set on the ground and connected by pipeline high pressure storage tank and low pressure storage tank, the pipeline is fixedly provided with solenoid valve, the outer wall of the low pressure storage tank is respectively provided with gas pressure sensor and controller, the gas pressure sensor is used for real-time monitoring the gas pressure in the low pressure storage tank and transmits the gas pressure signal to the controller; Waste gas pretreatment mechanism, set between the low temperature methanol washing mechanism and the low pressure storage tank, for filtering solid particle impurities in coal waste gas, and at the same time, the low temperature methanol washing mechanism is discharged from the tail gas condensation treatment, to clean out the coal tar and water vapor in the tail gas; Waste gas input pipe, set between the low pressure storage tank and the waste gas pretreatment mechanism, for conveying the coal waste gas in the low pressure storage tank to the waste gas pretreatment mechanism, the waste gas pretreatment mechanism and the low temperature methanol washing mechanism are provided with low temperature methanol washing tail gas first conveying pipe, for conveying the tail gas after low temperature methanol washing to the waste gas pretreatment mechanism as refrigerant, to solidify the coal tar and water vapor in the coal waste gas, and conveying the tail gas after heating to the RTO furnace through the low temperature methanol washing tail gas second conveying pipe.

2. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 1, characterized in that: The waste gas pretreatment mechanism includes waste residue cleaning mechanism and condensation impurity removal mechanism, the waste residue cleaning mechanism and the condensation impurity removal mechanism are connected with each other, the coal waste gas after condensation and impurity removal is directly input into the waste residue cleaning mechanism to perform solid particle impurity cleaning operation.

3. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 2, characterized in that: The waste residue cleaning mechanism includes a tail gas treatment cylinder and a connecting pipe fixedly arranged on the side wall of the tail gas treatment cylinder, a filter cartridge is fixedly arranged in the tail gas treatment cylinder, a gap is formed between the outer wall of the filter cartridge and the inner wall of the tail gas treatment cylinder, support rings are fixedly sleeved on both sides of the outer wall of the filter cartridge and located in the gap, the outer wall of the support ring is fixedly arranged on the inner wall of the tail gas treatment cylinder, a plurality of exhaust ports are uniformly arranged on the outer wall of the support ring away from the condensation impurity removal mechanism, a plurality of filter hole areas are uniformly arranged on the outer wall of the filter cartridge, a blowback assembly for preventing blockage is arranged on one side of each filter hole area, a long strip-shaped chip discharge port is arranged at the bottom of the tail gas treatment cylinder, and a second collecting box for collecting waste residue is detachably arranged in the long strip-shaped chip discharge port through bolts.

4. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 3, characterized in that: The blowback assembly includes a hollow arc-shaped plate fixedly arranged in the gap, a plurality of nozzles for spraying air to the filter hole area are uniformly arranged on the side wall of the hollow arc-shaped plate, a gas cylinder is fixedly arranged below the hollow arc-shaped plate and located in the filter cartridge, a piston is sealingly and slidably arranged in the gas cylinder, a push rod is fixedly arranged on the side wall of the piston, the push rod slidably penetrates the gas cylinder and extends to the outside, a spring is movably arranged between the piston and the inner wall of the gas cylinder, and a suction pipe and a blowback pipe are fixedly arranged at one end and the side wall of the gas cylinder, respectively, and are in communication with the inside thereof, a second one-way valve is fixedly arranged in the blowback pipe, which allows gas to flow into the hollow arc-shaped plate only, and a third one-way valve is fixedly arranged in the suction pipe, which allows gas to flow into the gas cylinder only.

5. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 2, characterized in that: The condensing impurity removal mechanism comprises a second tail gas treatment cylinder and a servo motor fixedly arranged at one end of the second tail gas treatment cylinder, a transmission shaft is rotatably arranged in the second tail gas treatment cylinder, the output shaft of the servo motor is fixedly connected with the transmission shaft, and a plurality of condensing components are uniformly arranged on the outer wall of the transmission shaft and are in sealing sliding connection between the outer wall of each condensing component and the inner wall of the second tail gas treatment cylinder.

6. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 5, characterized in that: The outer wall of the second tail gas treatment cylinder is provided with a first inlet and a first outlet for low-temperature methanol wash tail gas input and output at the uppermost two sides, respectively, the first inlet and the first outlet are connected with a low-temperature methanol wash tail gas first conveying pipe and a low-temperature methanol wash tail gas second conveying pipe, respectively, the outer wall of the second tail gas treatment cylinder is provided with a second inlet and a second outlet at the lowermost two sides, respectively, the second inlet and the second outlet are connected with a high-temperature waste gas output pipe and a low-temperature waste gas output pipe, respectively, a waste liquid discharge outlet is arranged at the bottom of the second tail gas treatment cylinder, and a first collecting box is detachably arranged in the waste liquid discharge outlet.

7. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 5, characterized in that: The condensing component comprises a bearing seat fixedly arranged on the outer wall of the transmission shaft, an installation cavity is arranged in the bearing seat, a first hollow vertical plate and a second hollow vertical plate are fixedly arranged at the two sides in the installation cavity, respectively, a first butt joint hole is arranged at the middle position of the top of the first hollow vertical plate, and a gas discharge pipe is fixedly and penetratively arranged in the first hollow vertical plate, and a first one-way valve allowing only gas outflow is fixedly arranged in the gas discharge pipe.

8. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 7, characterized in that: A second butt joint hole is arranged at the middle position of the top of the second hollow vertical plate, and a gas inlet pipe is fixedly and penetratively arranged in the second hollow vertical plate, a plurality of support plates are uniformly fixedly arranged in the bearing seat and between the second hollow vertical plate and the first hollow vertical plate, a plurality of heat exchange pipes are fixedly and penetratively arranged in the plurality of support plates, the two ends of the plurality of heat exchange pipes are connected with the interiors of the first hollow vertical plate and the second hollow vertical plate, respectively, and a plurality of through holes are arranged on the outer wall of the support plate.

9. The low temperature methanol wash RTO tail gas treatment device employing self-circulation gas cooling double valve plate butterfly valve according to claim 1, characterized in that: A coal-based waste gas input pipe is fixedly arranged on the outer wall of the high-pressure storage tank, used for conveying coal-based waste gas into the high-pressure storage tank through an external booster pump, a pressure sensor is further arranged in the high-pressure storage tank, used for monitoring the pressure of the high-pressure storage tank in real time, the data monitored by the pressure sensor is transmitted to the booster pump in real time, and the booster pump controls the air pressure in the high-pressure storage tank to be a set value in real time through the microcomputer in the booster pump.

10. The low temperature methanol wash RTO tail gas treatment device employing a self-circulation gas-cooled double valve plate butterfly valve according to claim 1, characterized in that: A high-temperature waste gas output pipe is further arranged between the waste gas pretreatment mechanism and the RTO furnace, used for conveying the high-temperature waste gas treated by the RTO furnace into the waste gas pretreatment mechanism through the high-temperature waste gas output pipe, so as to melt the solidified coal tar and water vapor.

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