Gasification slag treatment system and method

Abstract

The invention relates to a gasification furnace slag treatment system and method, and belongs to the technical field of gasification furnace slag treatment. According to the technical scheme, the position of a water injection nozzle corresponds to the position of a slag outlet of the gasification furnace; the lower end of the conveying ditch is connected with the feeding end of the solid-liquid separator, and the water spraying opening is connected with the water pool through a water pipe. Solid separated from the discharging end of the solid-liquid separator is transferred to a stock bin through a belt conveyor, a screen drum is arranged in the solid-liquid separator, an outer layer screen is arranged on an outer ring of the screen drum, and the outer layer screen is an integral circular screen installed on an outer ring frame of the screen drum. An inner ring of the screen drum is provided with an inner-layer screen, and the screen drum is composed of a plurality of linear screens which are evenly distributed on an inner ring frame of the screen drum. The system has the beneficial effects that the problems that fine slag is difficult to treat in the water filtering process of the gasification slag and pipeline equipment is circularly abraded all the time are solved, the system treatment efficiency is improved, equipment maintenance is reduced, the service life is prolonged, and meanwhile the occupied area for treatment of the gasification slag and the labor intensity of workers are reduced.

Description

Technical Field

[0001] The present invention relates to a gasifier slag treatment system and method, belonging to the technical field of gasifier slag treatment. Background Art

[0002] Gasifier slag is a common industrial waste and a by-product generated during gasification combustion. Its main components include silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, etc. Gasifier slag also contains a certain amount of heavy metals and their compounds such as iron, manganese, cobalt, and copper, and in addition, it contains a small amount of residual carbon and unburned carbon. The microstructure of gasifier slag is a porous structure, and the residual carbon is mostly a spongy porous structure.

[0003] The traditional treatment method is as follows: The bottom slag of the gasifier is treated by flushing with water for cooling and transporting it to a water tank through a slag ditch. When the bottom slag of the gasifier is discharged, a certain amount of water is used to transport it to the water tank in the form of a pipeline, and precipitation is carried out, and then it is grabbed and transported by a grab bucket; for example: Chinese Patent Application CN202310694222.7, titled "A Gasifier Slag Treatment Process and Device Based on the Transformation of Existing Technology", CN202222248728.9, titled "A Membrane Drum Cooling Kiln for Treating Gasifier Slag", etc. The problems existing in the prior art are: The water content of the gasifier slag after transportation is high, and the working efficiency is low and the degree of automation is low when filtering water again. Especially when the output of gasifier slag is large, the treatment system cannot cope with it, and the fine slag is not easy to precipitate in the traditional water tank, and it floats with the water flow and continuously circulates to wear the pipeline equipment. Summary of the Invention

[0004] The object of the present invention is to provide a gasifier slag treatment system and method, which solve the problems that the fine slag is difficult to treat during the water filtration process of gasifier slag and continuously circulates to wear the pipeline equipment, improve the system treatment efficiency, reduce equipment maintenance, increase the service life, and at the same time reduce the floor area for gasifier slag treatment and the labor intensity of workers.

[0005] The technical solution of the present invention is as follows: A gasification furnace slag treatment system includes a gasification furnace. At the slag discharge position below the gasification furnace, there is a conveying water channel. A water spraying port is arranged in the conveying water channel, and the position of the water spraying port corresponds to the position of the slag discharge port of the gasification furnace. The low end of the conveying water channel is connected to the feeding end of a solid-liquid separator, and the water spraying port is connected to a water tank through a water pipe. The solids separated from the discharge end of the solid-liquid separator are transported to a silo by a belt conveyor, and the liquid separated from the water outlet end of the solid-liquid separator flows into the water tank. A sieve cylinder is arranged in the solid-liquid separator. An outer sieve is arranged on the outer ring of the sieve cylinder. The outer sieve is an integral circular sieve installed on the outer ring frame of the sieve cylinder. An inner sieve is arranged on the inner ring of the sieve cylinder. The inner sieve is composed of multiple linear sieves evenly distributed on the inner ring frame of the sieve cylinder. The angle range between the arc tangent of the inner sieve and the corresponding outer sieve at the corresponding position is between 40 and 60 degrees. A plurality of water guide plates are arranged between the outer ring frame and the inner ring frame. A corresponding water guide plate is arranged below each inner sieve. The angle range between the water guide plate and the corresponding inner sieve is between 40 and 50 degrees. A material guide plate is arranged between the inner sieve and the outer sieve. A corresponding material guide plate is arranged above each inner sieve. The angle between the material guide plate and the corresponding inner sieve is between 120 and 140 degrees. Side sieves are arranged on both sides between the outer ring frame and the inner ring frame of the sieve cylinder. The side sieves are located on the sides of the space formed between the corresponding inner sieve and the water guide plate.

[0006] Further, in the middle of one side inside the inner ring of the sieve cylinder, there is a feeding pipe connected to the conveying water channel. The feeding pipe is a square pipe. After the square pipe enters the inner part of the inner ring of the sieve cylinder, a material leakage plate one is arranged at the bottom. Below the material leakage plate one, there is a square material leakage pipe, and a material leakage plate two is arranged at the bottom of the square material leakage pipe. Both the material leakage plate one and the material leakage plate two are steel plates with rectangular openings. When the gasification furnace slag enters the feeding pipe, the gasification furnace slag first passes through the material leakage plate one, falls on the material leakage plate two, and then passes through the material leakage plate two and falls into the sieve cylinder.

[0007] Further, on the other side inside the inner ring of the sieve cylinder, there is a hopper matching the belt conveyor. The hopper is open at the top, and a hopper side plate is arranged at the open part. The inclination angle of the hopper side plate is the same as the inclination angle of the inner sieve. After the gasification furnace slag in the sieve cylinder is filtered by the outer sieve, the inner sieve and the side sieve, the gasification furnace slag at the bottom is shoveled up by the inner sieve and lifted to the top as the sieve cylinder rotates. During the falling process of the gasification furnace slag, it falls into the hopper, and then falls along the hopper into the belt conveyor and is transferred to the silo.

[0008] Further, the material guide plate covers the connecting bolts between the outer sieve and the sieve cylinder and is fixedly connected to the sieve cylinder. Below the material guide plate in the sieve cylinder, there is also an impact prevention plate. The angle between the impact prevention plate and the corresponding inner sieve is between 80 and 90 degrees. The impact prevention plate covers the connecting bolts on the outer ring frame of the sieve cylinder and is fixedly connected to the sieve cylinder. The impact prevention plate also plays a role in buffering the gasification furnace slag and preventing the gasification furnace slag from impacting and wearing the connecting bolts during long-term use.

[0009] Further, an outer housing cover is provided outside the outer screen of the screen cylinder. The outer housing cover receives the water flowing down after filtration and conducts it out into a water tank. A slag flushing pump is provided on one side of the water tank, and an internal circulation pump is provided on the other side of the water tank.

[0010] Further, a compressed air purging mechanism, a pressure water purging mechanism I, and a pressure water purging mechanism II are provided on the outer housing cover.

[0011] Further, the screen cylinder is cylindrical. A cylinder neck is provided on the axial side of the cylindrical shape. The cylinder neck extends outside the outer housing cover. A support ring gear can be connected at the cylinder neck, and it is driven by a motor reducer to rotate for water filtration.

[0012] Further, the water tank can be a conical water tank or a horizontal flow water tank.

[0013] Further, the water tank is a horizontal flow water tank. The horizontal flow water tank is provided with a plurality of water distribution mechanisms. The plurality of water distribution mechanisms are arranged in a row on one side of the horizontal flow water tank. The water distribution mechanism is a funnel structure extending to the bottom of the horizontal flow water tank. A plurality of flow retardation structures are provided in the horizontal flow water tank. Each flow retardation structure is composed of a flow retardation plate I and a flow retardation plate II arranged perpendicular to the bottom of the horizontal flow water tank. The flow retardation plate I and the flow retardation plate II are arranged parallel to each other with a gap therebetween. The flow retardation plate I is arranged from the top of the horizontal flow water tank towards the bottom of the horizontal flow water tank. The distance between the bottom end of the flow retardation plate I and the bottom of the horizontal flow water tank is less than the distance between the bottom water outlet of the funnel structure of the water distribution mechanism and the bottom of the horizontal flow water tank. The flow retardation plate II is arranged from the bottom of the horizontal flow water tank towards the top of the horizontal flow water tank. The height of the top end of the flow retardation plate II is greater than the distance between the bottom end of the flow retardation plate I and the bottom of the horizontal flow water tank and less than the distance between the bottom water outlet of the funnel structure of the water distribution mechanism and the bottom of the water tank. One flow retardation structure can be arranged near the water distribution mechanism in the horizontal flow water tank, or only the flow retardation plate I can be arranged without arranging the flow retardation plate II. The remaining flow retardation structures are arranged at intervals in the horizontal flow water tank.

[0014] A method for treating gasification furnace slag. When the gasification furnace discharges slag, the slag and ash fall into a conveying water channel. Spray nozzles corresponding to the gasification furnaces one by one are provided on the conveying water channel. The spray nozzles spray pressure water during the falling process of the slag and ash, and send the slag and ash along the slope of the conveying water channel into a solid-liquid separator together. During the rotation of the solid-liquid separator, the outer screen and the side screen filter water. The inner screen of the solid-liquid separator shovels up the slag and ash after water filtration for further water filtration, and dumps it into a hopper during the rotation process. The slag after water filtration falls into a belt conveyor along the hopper for transfer to a storage bin for storage and transportation. During the water filtration process of the solid-liquid separator, the filtered water is conveyed to the water tank along the drain outlet of the outer housing cover.

[0015] During the water filtration process of the solid-liquid separator of the present invention, through the filtration of the outer sieve, the inner sieve, and the side sieve, not only the fine slag of the gasification furnace slag is effectively filtered, but also the water content of the finished slag is reduced. At the same time, the solid-liquid separator can handle 90%-95% of the gasification furnace slag, and the amount of slag in the water returned to the water tank is extremely small. Therefore, when setting up the water tank, the occupied area can be greatly reduced, and the floor area of the water tank can be reduced by more than 50% compared with the existing technology, reducing the investment. By adding a sliding cover plate to the conical water tank, the dispersion of steam in the water tank is greatly reduced, avoiding the dispersion of smaller particles of gasification furnace slag and furnace ash into the external environment with water vapor, making the conical water tank more airtight and more environmentally friendly. By adding a water distribution mechanism, a first flow retarder, and a second flow retarder to the horizontal flow water tank, the fine slag in the sedimentation water tank is further settled, preventing the fine slag from being difficult to settle when the water containing part of the fine slag flows, which is difficult to handle and continuously circulates to wear the pipeline equipment, achieving the effects of higher system efficiency, less equipment maintenance, and longer durability.

[0016] The beneficial effects of the present invention: Solve the problems of difficult treatment of fine slag during the water filtration process of gasification furnace slag and continuous circulation and wear of pipeline equipment, improve the system treatment efficiency, reduce equipment maintenance, increase the service life, and at the same time reduce the floor area for gasification furnace slag treatment and the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the process flow chart of the embodiment of the present invention; Figure 2 It is the structural schematic diagram of the solid-liquid separator of the embodiment of the present invention; Figure 3 It is the partial enlarged view of part A of the solid-liquid separator of the embodiment; Figure 4 It is the partial enlarged view of part B of the solid-liquid separator of the embodiment; Figure 5 It is the partial enlarged view of part C of the solid-liquid separator of the embodiment; Figure 6 It is the axonometric view of the solid-liquid separator of the embodiment; Figure 7 It is the partial enlarged view of part D of the solid-liquid separator of the embodiment; Figure 8 It is the front view of the solid-liquid separator of the embodiment; Figure 9 It is the partial enlarged view of part E of the solid-liquid separator of the embodiment; Figure 10 It is the cross-sectional view of the water tank structure of the first embodiment of the present invention; Figure 11 It is the structural schematic diagram of the water tank of the second embodiment of the present invention; Figure 12 It is the F-F cross-sectional schematic view of the second embodiment of the present invention; Figure 13Schematic diagram of the internal structure of the solid-liquid separator according to the embodiment of the present invention; In the figure: gasifier 1, conveying water channel 2, water spraying port 21, solid-liquid separator 3, outer shell cover 31, exhaust port 311, drain port 312, compressed air purging mechanism 313, first pressure water purging mechanism 314, second pressure water purging mechanism 315, sieve cylinder 32, outer layer sieve 321, inner layer sieve 322, water guiding plate 323, material guiding plate 324, impact prevention plate 325, side sieve 326, feed pipe 33, first material leakage plate 331, second material leakage plate 332, hopper 34, hopper side plate 341, belt conveyor 4, storage bin 5, conical water tank 6, slag flushing pump 61, internal circulation pump 62, sliding water tank cover 63, flat flowing water tank 7, water distribution mechanism 71, first slow flow plate 72, second slow flow plate 73, grab bucket 74, movable cover plate 75, buffer slope 76, overflow weir 77. Specific embodiments

[0018] The present invention will be further described below with reference to the accompanying drawings through embodiments.

[0019] A gasifier slag treatment system includes a gasifier 1. A conveying water channel 2 is provided at the slag discharging position below the gasifier 1. A water spraying port 21 is arranged in the conveying water channel 2, and the position of the water spraying port 21 corresponds to the position of the slag discharging port of the gasifier 1. The low end of the conveying water channel 2 is connected to the feeding end of the solid-liquid separator 3, and the water spraying port 21 is connected to a water tank through a water pipe. The solid separated at the discharging end of the solid-liquid separator 3 is transported to the storage bin 5 through the belt conveyor 4, and the liquid separated at the water discharging end of the solid-liquid separator 3 flows into the water tank 6. It is characterized in that: a sieve cylinder 32 is arranged in the solid-liquid separator 3. An outer layer sieve 321 is arranged on the outer ring of the sieve cylinder 32, and the outer layer sieve 321 is an integral circular sieve installed on the outer ring frame of the sieve cylinder 32. An inner layer sieve 322 is arranged on the inner ring of the sieve cylinder 32, and the inner layer sieve 322 is a plurality of linear sieves evenly distributed on the inner ring frame of the sieve cylinder 32. The angle range between the arc tangent of the inner layer sieve 322 and the corresponding outer layer sieve 321 is between 40 and 60 degrees. A plurality of water guiding plates 323 are arranged between the outer ring frame and the inner ring frame. A corresponding water guiding plate 323 is arranged below each inner layer sieve 322, and the angle range between the water guiding plate 323 and the corresponding inner layer sieve 322 is between 40 and 50 degrees. A material guiding plate 324 is arranged between the inner layer sieve 322 and the outer layer sieve 321. A corresponding material guiding plate 324 is arranged above each inner layer sieve 322, and the angle between the material guiding plate 324 and the corresponding inner layer sieve 322 is between 120 and 140 degrees. Side sieves 326 are arranged on both sides between the outer ring frame and the inner ring frame of the sieve cylinder 32, and the side sieves 326 are located on the sides of the space formed between the corresponding inner layer sieve 322 and the water guiding plate 323.

[0020] Refer to the attached Figure 13, on one side in the middle of the inner ring of the screen cylinder 32, there is a feed pipe 33 connected to the conveying water channel 2; the feed pipe 33 is a square pipe. After the square pipe enters the inner ring of the screen cylinder 32, there is a first leakage plate 331 at the bottom, and a square leakage pipe is arranged below the first leakage plate 331, and a second leakage plate 332 is arranged at the bottom of the square leakage pipe; the first leakage plate 331 and the second leakage plate 332 are steel plates with rectangular openings. When the gasification furnace slag enters the feed pipe 33, the gasification furnace slag first passes through the first leakage plate 331, falls on the second leakage plate 332, and then passes through the second leakage plate 332 and falls into the screen cylinder 32.

[0021] Refer to the appendix Figure 13 , on the other side in the inner ring of the screen cylinder 32, there is a hopper 34 matched with the belt conveyor 4; the hopper 34 is open at the top, and there is a hopper side plate 341 at the open part, and the inclination angle of the hopper side plate 341 is the same as the inclination angle of the inner layer screen 322; after the gasification furnace slag in the screen cylinder 32 is filtered by the outer layer screen 321, the inner layer screen 322 and the side screen 323, the gasification furnace slag at the bottom is shoveled up by the inner layer screen 322 and lifted to the top along with the rotation of the screen cylinder 32. During the falling process of the gasification furnace slag, it falls into the hopper 32, falls along the hopper 32 into the belt conveyor 4 and is transferred to the silo 5.

[0022] Refer to the appendix Figure 5 , the guide plate 324 covers the connecting bolts between the outer layer screen 321 and the screen cylinder 32, and is fixedly connected to the screen cylinder 32. Below the guide plate 324 in the screen cylinder 32, there is also an impact prevention plate 325, and the angle between the impact prevention plate 325 and the corresponding inner layer screen 322 is between 80 - 90 degrees. The impact prevention plate 325 covers the connecting bolts on the outer ring frame of the screen cylinder 32 and is fixedly connected to the screen cylinder 32. The impact prevention plate 325 also plays a role in buffering the gasification furnace slag and preventing the gasification furnace slag from impacting and wearing the connecting bolts during long-term use.

[0023] Refer to the appendix Figure 2 and 13 , on the outside of the outer layer screen 321 of the screen cylinder 32, there is a housing cover 31. The housing cover 31 receives the water flowing down after filtration and discharges it into the water pool. Refer to the appendix Figure 1 , on one side of the water pool, there is a slag flushing pump 61, and on the other side of the water pool, there is an internal circulation pump 62.

[0024] Refer to the appendix Figure 3 , 4 and 7, on the housing cover 31, there are a compressed air purging mechanism 313, a pressure water purging mechanism one 314 and a pressure water purging mechanism two 315.

[0025] The sieve cylinder 32 is cylindrical, and a cylinder neck is provided on the axial side of the cylindrical shape. The cylinder neck extends outside the outer shell 31, and a support ring gear can be connected to the cylinder neck, and it is driven by a motor reducer to rotate for water filtration.

[0026] The water tank can be a conical water tank 6 or a horizontal flow water tank 7.

[0027] The water tank is a horizontal flow water tank 7. The horizontal flow water tank 7 is provided with a plurality of water distribution mechanisms 71. The plurality of water distribution mechanisms 71 are arranged in a row on one side of the horizontal flow water tank. The water distribution mechanism 71 is a funnel structure extending to the bottom of the horizontal flow water tank; a plurality of flow retardation structures are arranged in the horizontal flow water tank 7. Each flow retardation structure is composed of a first flow retardation plate 72 and a second flow retardation plate 73 perpendicular to the bottom of the horizontal flow water tank. The first flow retardation plate 72 and the second flow retardation plate 73 are arranged parallel to each other with a gap therebetween. The first flow retardation plate 72 is arranged from the top of the horizontal flow water tank 7 to the bottom of the horizontal flow water tank 7. The distance between the bottom end of the first flow retardation plate 72 and the bottom of the horizontal flow water tank 7 is less than the distance between the bottom water outlet of the funnel structure of the water distribution mechanism 71 and the bottom of the horizontal flow water tank; the second flow retardation plate 73 is arranged from the bottom of the horizontal flow water tank 7 to the top of the horizontal flow water tank 7. The height of the top end of the second flow retardation plate 73 is greater than the distance between the bottom end of the first flow retardation plate 72 and the bottom of the horizontal flow water tank 7 and less than the distance between the bottom water outlet of the funnel structure of the water distribution mechanism 71 and the bottom of the water tank; a flow retardation structure can be arranged near the water distribution mechanism 71 in the horizontal flow water tank, or only the first flow retardation plate 72 is arranged without the second flow retardation plate 73; the remaining flow retardation structures are arranged at intervals in the horizontal flow water tank.

[0028] A method for treating gasification furnace slag. When the gasification furnace 1 discharges slag, the slag and ash fall into the conveying water channel 2. The conveying water channel 2 is provided with a water spraying port 21 corresponding to each gasification furnace. The water spraying port 21 sprays pressurized water during the falling process of the slag and ash, and sends the slag and ash along the slope of the conveying water channel into the solid-liquid separator 3 together. During the rotation of the solid-liquid separator 3, the outer layer sieve 321 and the side sieve 326 filter water. The inner layer sieve 322 of the solid-liquid separator 3 shovels up the slag and ash after water filtration for further water filtration, and dumps it into the hopper 34 during the rotation process. The slag after water filtration falls into the belt conveyor 4 along the hopper and is transported to the storage bin 5 for storage and transportation; during the water filtration process of the solid-liquid separator 3, the filtered water is transported to the water tank along the drain port of the outer shell 31.

[0029] In the embodiment, as shown in the attached Figure 1As shown, the number of the gasifiers 1 is multiple. The bottom furnace tubes of the gasifiers 1 discharge slag, and a conveying water channel 2 is provided at the bottom of the gasifiers 1. The conveying water channel 2 is inclined at a certain slope, and the slope is between 2% and 6%. One end of the conveying water channel 2 with a higher slope is blocked. A number of water spray nozzles 21 are provided in the conveying water channel 2. The number of the water spray nozzles 21 is equal to the number of the gasifiers 1, and the positions of the water spray nozzles 21 correspond to the positions of the gasifiers 1 one by one. The water spray nozzles 21 are connected to a water tank. When the gasifiers 1 discharge slag, the water spray nozzles 21 spray pressurized water to convey the gasifier slag along the conveying water channel 2 away.

[0030] As shown in the Figure 1 attachment, one end of the conveying water channel 2 with a lower slope is connected to the feeding end of a solid-liquid separator 3. A belt conveyor 4 is provided at the discharging end of the solid-liquid separator 3. The belt conveyor 4 conveys the processed gasifier slag from the solid-liquid separator 3 to a silo 5. The water outlet end of the solid-liquid separator 5 is connected to the water tank. A slag flushing pump 61 is provided on one side of the water tank. The slag flushing pump 61 conveys the purified water precipitated in the water tank back to the water spray nozzles 21 to circulate and convey the gasifier slag. An internal circulation pump 62 is provided on the other side of the water tank. The internal circulation pump 62 conveys the gasifier slag precipitated in the water tank back to the solid-liquid separator 3 for solid-liquid separation again.

[0031] As shown in the Figure 2 attachment, the solid-liquid separator 3 includes an outer shell cover 31. The outer shell cover 31 is an irregular cover body, and an exhaust port 311 is provided at the top, which can be connected to a chimney. A drain port 312 is provided at the bottom of the outer shell cover 31, and it can be connected to the water tank 6 through a water pipe.

[0032] As shown in the Figure 2 and the Figure 6 attachment, a through hole is provided in the axial direction of the outer shell cover 31. A sieve cylinder 32 is provided inside the outer shell cover 32. The sieve cylinder 32 is cylindrical. Two side surfaces in the axial direction of the cylinder are provided with cylinder necks, and the cylinder necks extend outside the outer shell cover 31. A support ring gear can be connected at the cylinder necks, and it is driven by a motor reducer to rotate for water filtration.

[0033] As shown in the Figure 2 , the Figure 5 and the Figure 6 attachment, an outer layer sieve 321 is provided on the outer ring of the sieve cylinder 32. The outer layer sieve 321 is composed of a plurality of arc-shaped sieve meshes. The arc-shaped sieve meshes are independent structures that can be replaced individually. The outer layer sieve 321 is installed on an outer ring frame. Multiple outer layer sieve 321 are jointly assembled into the outer ring of the sieve cylinder 32 and fixed by bolts.

[0034] The number of the outer layer sieve 321 is multiple. Along the axial direction of the sieve cylinder 32, 2 to 4 outer layer sieves are arranged. Each outer layer sieve is arranged in parallel to form a large combined outer sieve mesh.

[0035] As shown in the appendix Figure 5 As shown, an inner sieve 322 is provided on the inner ring of the outer sieve 321. The inner sieve 322 is arranged on the inner ring frame. There is a certain angle between the tangent of the inner sieve 322 and the outer sieve 321. The inclination angle of the inner sieve 322 can be determined according to the actual situation, and its angle range is between 40-60 degrees. The inner sieve 322 is installed along the axial direction of the sieve cylinder 32. The number of the inner sieves 322 is multiple. The inner sieve 322 is an independently replaceable and independent structure. Both the inner sieve 322 and the outer sieve 321 are composed of a plate frame and a sieve mesh.

[0036] The inner sieves 322 are arranged in 2-4 groups along the axial direction of the sieve cylinder 32. Each group of inner sieves is arranged in parallel to form a large combined inner sieve mesh.

[0037] As shown in the appendix Figure 2 and the appendix Figure 5 As shown, a water guide plate 323 is provided below the inner sieve 322. There is a certain angle between the water guide plate 323 and the corresponding inner sieve 323. The inclination angle between the water guide plate 323 and the inner sieve 323 can be determined according to the actual situation. In this embodiment, the angle range between the water guide plate 323 and the corresponding inner sieve 323 is between 40-50 degrees. The water guide plate 323 is fixedly connected to the sieve cylinder 32. When the sieve cylinder 32 rotates, the inner sieve 322 shovels up the gasification slag for water filtration. The water guide plate 323 blocks the water filtered out by the corresponding inner sieve 322, so that the filtered water flows along the water guide plate 323, preventing the gasification slag that has already been filtered from being wetted by water again.

[0038] As shown in the appendix Figure 2 and the appendix Figure 5 As shown, a material guide plate 324 is provided between the inner sieve 322 and the outer sieve 321. There is a certain angle between the material guide plate 324 and the corresponding inner sieve 322. The inclination angle between the material guide plate 324 and the corresponding inner sieve 322 can be determined according to the actual situation. In this embodiment, the angle range between the material guide plate 324 and the inner sieve 322 is between 120-140 degrees. The material guide plate 324 covers the connecting bolts between the outer sieve 321 and the sieve cylinder 32 and is fixedly connected to the sieve cylinder 32. The material guide plate 324 can receive the material (gasification slag) and make it smoothly fall onto the corresponding inner sieve 322 for water filtration, and play a role in protecting the connecting bolts between the outer sieve 321 and the sieve cylinder 32, preventing the connecting bolts from being impacted and worn by the gasification slag during long-term use.

[0039] As shown in the appendix Figure 2 and the appendix Figure 5As shown, an impact prevention plate 325 is further provided inside the sieve cylinder 32. The impact prevention plate 325 is arranged at a certain angle with the corresponding inner sieve 322. The inclination angle between the impact prevention plate 325 and the corresponding inner sieve 322 can be determined according to the actual situation. In this embodiment, the angle between the impact prevention plate 325 and the inner sieve 322 is between 80 - 90 degrees. The impact prevention plate 325 covers the connecting bolts on the outer ring frame of the sieve cylinder 32 and is fixedly connected to the sieve cylinder 32. The impact prevention plate 325 also functions to buffer the gasification furnace slag and prevent the gasification furnace slag from impacting and wearing the connecting bolts during long-term use.

[0040] As shown in the attached Figure 8 and the attached Figure 9 As shown, side sieves 326 are further provided on both sides of the inner ring frame and the outer ring frame of the sieve cylinder 32. The number of the side sieves 326 is multiple. The side sieves 326 are arranged along the central circumference of the sieve cylinder 32. The side sieves 326 are separate and replaceable independent structures. The side sieves 326 are composed of a plate frame and a sieve mesh. The side sieves 326 are located on the side of the space formed between the corresponding inner sieve 322 and the water guide plate 323. The side sieves 326 are fixedly connected to the sieve cylinder 32 through bolts.

[0041] As shown in the attached Figure 13 As shown, a feed pipe 33 connected to the conveying water channel 2 is provided in the middle of one side inside the inner ring of the sieve cylinder 32. The feed pipe 33 is a square pipe. After the square pipe enters the inner part of the inner ring of the sieve cylinder 32, a first leakage plate 331 is provided at the bottom. A square leakage pipe is provided below the first leakage plate 331, and a second leakage plate 332 is provided at the bottom of the square leakage pipe. The first leakage plate 331 and the second leakage plate 332 are steel plates with rectangular openings. When the gasification furnace slag enters the feed pipe 33, the gasification furnace slag first passes through the first leakage plate 331, falls on the second leakage plate 332, and then passes through the second leakage plate 332 and falls into the sieve cylinder 32. This setting prevents the gasification furnace slag from directly entering the sieve cylinder 32 with a large impact force and damaging the inner sieve 322.

[0042] As shown in the attached Figure 2 and the attached Figure 8 、 13 As shown, a hopper 34 matching the belt conveyor 4 is provided on the other side inside the inner ring of the sieve cylinder 32. The hopper 34 is open at the top, and a hopper side plate 341 is provided at the open part. The inclination angle of the hopper side plate 341 is the same as the inclination angle of the inner sieve 322. After the gasification furnace slag in the sieve cylinder 32 is filtered by the outer sieve 321, the inner sieve 322 and the side sieve 323, the gasification furnace slag at the bottom is shoveled up by the inner sieve 322 and lifted to the top as the sieve cylinder 32 rotates. During the falling process of the gasification furnace slag, it falls into the hopper 32, and then falls along the hopper 32 into the belt conveyor 4 and is transferred to the silo 5.

[0043] As shown in the attached Figure 2As shown, a compressed air purging mechanism 313 is provided on the outer shell cover 31. The compressed air purging mechanism 313 is a steel pipe with a number of nozzles, which sprays compressed air to purge the outer layer sieve 321 and the inner layer sieve 322. The compressed air purging mechanism 313 is arranged along the axial direction of the sieve cylinder 32. The nozzles of the compressed air purging mechanism 313 are oriented towards the center of the sieve cylinder 32. The position of the compressed air purging mechanism 313 is located at the upper left or upper right of the sieve cylinder 32, and its specific position can be determined according to the actual situation.

[0044] As shown in the attached Figure 3 As shown, a pressure water purging mechanism I 314 is provided on the outer shell cover 31. The pressure water purging mechanism I 314 is a steel pipe with a number of nozzles, which sprays pressure water to purge the outer layer sieve 321 and the inner layer sieve 322. The pressure water purging mechanism I 314 is arranged along the axial direction of the sieve cylinder 32. The nozzles of the pressure water purging mechanism I 314 are oriented towards the center of the sieve cylinder 32. The position of the pressure water purging mechanism I 314 is located at the lower left or lower right of the sieve cylinder 32, and its specific position can be determined according to the actual situation.

[0045] As shown in the attached Figure 6 and the attached Figure 7 As shown, a pressure water purging mechanism II 315 is provided on the side of the outer shell cover 31. The pressure water purging mechanism II 315 is a steel pipe with a number of nozzles, which sprays pressure water to purge the side sieve 326. The pressure water purging mechanism I 315 is arranged along the axial direction of the sieve cylinder 32. The position of the pressure water purging mechanism II 315 is located at the lower left or lower right of the sieve cylinder 32, and its specific position can be determined according to the actual situation.

[0046] The sieves of the outer layer sieve 321, the inner layer sieve 322 and the side sieve 323 have a certain elasticity. Therefore, even when the sieve meshes are blocked by fine slag, when the compressed air and pressure water of the compressed air purging mechanism 313, the pressure water purging mechanism I 314 and the pressure water purging mechanism II 315 are used for cleaning and purging, the sieve meshes are deformed under the impact, so that the fine slag stuck in the sieve mesh gaps falls off, preventing the sieve meshes from being blocked.

[0047] Example 1, as shown in the attached Figure 10 As shown, the water tank is a conical water tank 6, and a sliding cover plate 63 is provided above it. The sliding cover plate 63 can be driven by a hydraulic motor to open and close, preventing the steam in the conical water tank 6 from wrapping the smaller particle-sized gasified furnace slag and diffusing into the external environment together with the water vapor, causing pollution.

[0048] Example 2, referring to the attached Figure 11 、 12As shown, the water pool is a horizontal flow pool 7, and the horizontal flow pool 7 is provided with a plurality of water diversion mechanisms 71, which are arranged in a row on one side of the horizontal flow pool, and the water diversion mechanism 71 is a funnel structure extending to the bottom of the horizontal flow pool; a plurality of slow flow structures are provided in the horizontal flow pool 7, and each slow flow structure is composed of a slow flow plate 1 72 and a slow flow plate 2 73 arranged perpendicular to the bottom of the horizontal flow pool, and the slow flow plate 1 72 and the slow flow plate 2 73 are arranged parallel to each other with a gap between them, and the slow flow plate 1 72 is arranged along the top of the horizontal flow pool 7 toward the bottom of the horizontal flow pool 7, and the bottom end of the slow flow plate 1 72 The distance between the bottom of the advection pool 7 and the bottom of the advection pool 7 is smaller than the distance between the bottom water outlet of the funnel structure of the water diversion mechanism 71 and the bottom of the advection pool; the slow flow plate 2 73 is arranged along the bottom of the advection pool 7 to the top of the advection pool 7, and the top height of the slow flow plate 2 73 is greater than the distance between the bottom end of the slow flow plate 1 72 and the bottom of the advection pool 7, and is smaller than the distance between the bottom water outlet of the funnel structure of the water diversion mechanism 71 and the bottom of the pool; a slow flow structure can be arranged near the water diversion mechanism 71 in the advection pool, or only the slow flow plate 1 72 is arranged, and the slow flow plate 2 73 is not arranged; the remaining slow flow structures are arranged at intervals in the advection pool.

[0049] The water entering the advection pool flows horizontally into each water diversion mechanism 71 from one side of the advection pool, and the water flows into the pool 7 along the water outlet at the bottom of the water diversion mechanism 71. The water flow direction is shown by the arrow. The water in the water diversion mechanism 71 falls into the advection pool 7 and first encounters the obstruction of the slow flow plate 1, passes downward through the bottom of the slow flow plate 1 72, and then encounters the obstruction of the slow flow plate 2 73, and then flows upward through the gap between the slow flow plate 1 72 and the slow flow plate 2 73, overflows along the top of the slow flow plate 2 73, and then overflows through the next slow flow structure, completing the gradual sedimentation of fine residues in the water to the bottom of the advection pool.

[0050] The advection pool 7 is also provided with a grab bucket 74, and the fine slag is caught and transported by the grab bucket 74 after settling.

[0051] As attached Figure 11 , 12 As shown, the advection pool 7 is also provided with a movable cover plate 75, on which wheels are provided, and tracks are provided on both sides of the advection pool 7. The wheels can move on the tracks and are driven to open and close by a hydraulic motor. When the grab bucket 74 grabs fine slag, the movable cover plate 75 moves along the track to open. After the grab bucket 74 finishes the slag grabbing operation, the movable cover plate 75 is closed to prevent the steam in the advection pool 7 from wrapping smaller particles of gasified slag and diffusing to the external environment with the water vapor to cause pollution.

[0052] The movable cover plates 75 are two in number and are arranged alternately with each other. Both movable cover plates are arranged on their own tracks. During the slag grabbing operation, one movable cover plate overlaps with the other movable cover plate after moving, so as to minimize the exposed area above the advection pool.

[0053] A buffer slope 76 is provided below the water diversion mechanism 71. The water flow first passes through the buffer slope 76 through the openings at the lower part of the water diversion mechanism 71 and then flows along the water flow direction as indicated by the arrow. An overflow weir 77 is provided on one side of the horizontal flow pool 7, and when the horizontal flow pool is overfilled, the water can flow into the water channel through the overflow weir 77.

[0054] Working process: When the gasifier 1 discharges slag, the slag and ash fall into the conveying water channel 2. The water spraying nozzles 21 corresponding to the gasifiers one by one are provided on the conveying water channel 2. The water spraying nozzles 21 spray pressurized water during the falling process of the slag and ash, and send the slag and ash along the slope of the conveying water channel into the solid-liquid separator 3 together. During the rotation of the solid-liquid separator 3, the outer layer sieve 321 and the side sieve 326 filter water. The inner layer sieve 322 of the solid-liquid separator shovels up the slag and ash after water filtration and filters water again, and dumps it into the hopper 34 during the rotation process. The slag after water filtration falls into the belt conveyor 4 along the hopper and is transported to the storage bin 5 for storage and transportation; during the water filtration process of the solid-liquid separator 3, the filtered water is transported to the pool along the drain outlet of the outer shell cover.

[0055] At this time, 90%-95% of the slag has been filtered and transported away by the solid-liquid separator 3. However, there is still a small amount of fine slag in the water. After the fine slag enters the conical pool 6 in the first embodiment or the horizontal flow pool 7 in the second embodiment and precipitates, the precipitated gasifier slag is transported back to the solid-liquid separator for solid-liquid separation. The slag flushing pump transports the water back to the water pipe at the water spraying nozzle, and the cycle is carried out.

[0056] Since the solid-liquid separator can handle 90%-95% of the gasifier slag and the amount of slag contained in the water returning to the pool is extremely small, the occupied area can be greatly reduced when setting the pool area, which can be reduced by more than 50% compared with the original pool occupied area, reducing the investment.

Claims

1. A gasification furnace slag treatment system, comprising a gasification furnace (1), wherein a conveying ditch (2) is provided at a slag discharge position below the gasification furnace (1), wherein a water spraying port (21) is provided in the conveying ditch (2), and the position of the water spraying port (21) corresponds to the position of the slag discharge port of the gasification furnace (1); the lower end of the conveying ditch (2) is connected to the feed end of a solid-liquid separator (3), and the water spraying port (21) is connected to a water pool through a water pipe; the solid separated at the discharge end of the solid-liquid separator (3) is transported to a silo (5) through a belt conveyor (4), and the liquid separated at the water discharge end of the solid-liquid separator (3) flows into a water pool (6); the characteristics are: The solid-liquid separator (3) is provided with a sieve drum (32) inside, and the outer ring of the sieve drum (32) is provided with an outer layer sieve (321), and the outer layer sieve (321) is an integral circular sieve installed on the outer ring frame of the sieve drum (32); the inner ring of the sieve drum (32) is provided with an inner layer sieve (322), and the inner layer sieve (322) is a plurality of linear sieves evenly distributed on the inner ring frame of the sieve drum (32), and the angle between the inner layer sieve (322) and the arc tangent of the outer layer sieve (321) at the corresponding position is in the range of 40-60 degrees; a plurality of water guide plates (323) are provided between the outer ring frame and the inner ring frame, and a corresponding water guide plate (323) is provided below each inner layer sieve (322). 323), the angle between the water guide plate (323) and the corresponding inner screen (322) is between 40 and 50 degrees; a material guide plate (324) is provided between the inner screen (322) and the outer screen (321), a corresponding material guide plate (324) is provided above each inner screen (322), and the angle between the material guide plate (324) and the corresponding inner screen (322) is between 120 and 140 degrees; side screens (326) are provided on both sides between the outer ring frame and the inner ring frame of the screen cylinder (32), and the side screens (326) are located on the side of the space formed between the corresponding inner screen (322) and the water guide plate (323).

2. A gasification furnace slag treatment system according to claim 1, characterized in that: A feed pipe (33) connected to the conveying ditch (2) is provided in the middle of one side of the inner ring of the sieve drum (32); the feed pipe (33) is a square pipe, and after the square pipe enters the inner ring of the sieve drum (32), a leakage plate 1 (331) is provided at the bottom, a square leakage pipe is provided below the leakage plate 1 (331), and a leakage plate 2 (332) is provided at the bottom of the square leakage pipe; the leakage plate 1 (331) and the leakage plate 2 (332) are both steel plates with rectangular openings, and when the gasification furnace slag enters the feed pipe (33), the gasification furnace slag first passes through the leakage plate 1 (331), falls on the leakage plate 2 (332), and then passes through the leakage plate 2 (332) and falls into the sieve drum (32).

3. A gasification furnace slag treatment system according to claim 2, characterized in that: A hopper (34) matching the belt conveyor (4) is provided on the other side of the inner ring of the sieve drum (32); the hopper (34) is open at the top, and a hopper side plate (341) is provided at the open position, and the inclination angle of the hopper side plate (341) is consistent with the inclination angle of the inner screen (322); after the gasified slag in the sieve drum (32) is filtered through the outer screen (321), the inner screen (322) and the side screen (323), the gasified slag at the bottom is scooped up by the inner screen (322) and lifted to the top as the sieve drum (32) rotates, and the gasified slag falls into the hopper (32) during the process of falling, falls along the hopper (32) into the belt conveyor (4) and is transferred into the silo (5).

4. A gasification furnace slag treatment system according to claim 3, characterized in that: The guide plate (324) covers the connecting bolts between the outer screen (321) and the screen drum (32), and is fixedly connected to the screen drum (32); an anti-collision plate (325) is also provided below the guide plate (324) in the screen drum (32); the angle between the anti-collision plate (325) and the corresponding inner screen (322) is between 80 and 90 degrees; the anti-collision plate (325) covers the connecting bolts on the outer ring frame of the screen drum (32), and is fixedly connected to the screen drum (32).

5. A gasification furnace slag treatment system according to claim 1 or 2, characterized in that: An outer shell cover (31) is provided on the outside of the outer screen (321) of the screen drum (32). The outer shell cover (31) receives filtered water and guides it into a water pool. A slag flushing pump (61) is provided on one side of the water pool, and an internal circulation pump (62) is provided on the other side of the water pool.

6. A gasification furnace slag treatment system according to claim 5, characterized in that: The outer shell (31) is provided with a compressed air purge mechanism (313), a first pressure water purge mechanism (314) and a second pressure water purge mechanism (315).

7. A gasification furnace slag treatment system according to claim 1 or 2, characterized in that: The water pool is a conical water pool (6).

8. A gasification furnace slag treatment system according to claim 1 or 2, characterized in that: The water pool is a horizontal flow pool (7), and the horizontal flow pool (7) is provided with a plurality of water diversion mechanisms (71), and the plurality of water diversion mechanisms (71) are arranged in a row on one side of the horizontal flow pool, and the water diversion mechanisms (71) are funnel structures extending toward the bottom of the horizontal flow pool; a plurality of slow flow structures are provided in the horizontal flow pool (7), and each slow flow structure is composed of a slow flow plate 1 (72) and a slow flow plate 2 (73) arranged perpendicular to the bottom of the horizontal flow pool, and the slow flow plate 1 (72) and the slow flow plate 2 (73) are arranged parallel to each other with a gap between them, and the slow flow plate 1 (72) is arranged along the top of the horizontal flow pool (7) toward the bottom of the horizontal flow pool (7), and the bottom end of the slow flow plate 1 (72) is provided. The distance between the bottom of the advection pool (7) and the water outlet at the bottom of the funnel structure of the water diversion mechanism (71) is less than the distance between the bottom of the water outlet and the bottom of the advection pool; the second slow flow plate (73) is arranged along the bottom of the advection pool (7) toward the top of the advection pool (7), and the top height of the second slow flow plate (73) is greater than the distance between the bottom of the first slow flow plate (72) and the bottom of the advection pool (7), and less than the distance between the bottom of the water outlet of the funnel structure of the water diversion mechanism (71) and the bottom of the pool; a slow flow structure can be arranged near the water diversion mechanism (71) in the advection pool, or only the first slow flow plate (72) can be arranged without the second slow flow plate (73); the remaining slow flow structures are arranged at intervals in the advection pool.

9. A method for treating a gasification furnace slag treatment system according to any one of claims 1 to 8, characterized in that: When the gasifier (1) discharges slag, the slag and ash fall into the conveying ditch (2). The conveying ditch (2) is provided with water spray ports (21) corresponding to the gasifiers. The water spray ports (21) spray pressurized water during the falling process of the slag and ash, and send the slag and ash into the solid-liquid separator (3) along the slope of the conveying ditch (2). During the rotation of the solid-liquid separator (3), the outer screen (321) and the side screen (326) filter water. The inner screen (322) of the solid-liquid separator scoops up the filtered slag and ash for filtering again, and dumps it into the hopper (34) during the rotation. The filtered slag falls along the hopper (34) into the belt conveyor (4) and is transferred to the silo (5) for storage and transportation. During the filtering process of the solid-liquid separator (3), the filtered water is transported to the water pool along the drainage port of the outer cover (31).

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