Gasification slag water circulation system

Abstract

The utility model relates to a gasified slag water circulation system, and relates to the technical field of gasified slag treatment equipment, the gasified slag water circulation system comprises a feed mixing device, a two-stage screening device and a hydrocyclone, the feed mixing device comprises a reaction kettle, a gasified slag feed port, a circulation liquid inlet, a water supplementing port and a reaction kettle discharge port; the first screening structure comprises a first-stage roller filter screen and a first-stage spiral conveyor, the second screening structure comprises a second-stage roller filter screen and a second-stage spiral conveyor, the first-stage roller filter screen can filter out gasified slag, and then the gasified slag enters the first-stage spiral conveyor for precipitation; the second-stage roller filter screen can further filter out gasified slag, then the gasified slag enters the second-stage spiral conveying device to reduce water, and mixed liquid enters the hydrocyclone to be subjected to solid-liquid separation. The gasification slag screening device is used for solving the problems that an existing gasification slag screening device is large in water consumption and prone to causing secondary pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gasification slag treatment equipment, in particular to a gasification slag water circulation system. BACKGROUND

[0002] China is a large coal producer and consumer. Coal gasification technology, as an important clean coal utilization technology, has developed rapidly. However, a large amount of coal gasification slag is produced in the process of coal gasification. Sieving treatment of gasification slag is one of the common links in industrial production, and is widely used in coal chemical industry, steel industry and other industries.

[0003] The existing equipment uses a large amount of water for sieving, but cannot effectively reduce the water content of gasification slag, resulting in high cost of subsequent transportation and storage, and increasing the risk of secondary pollution. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a gasification slag water circulation system to solve the problems of large water consumption of the current gasification slag sieving equipment and easy secondary pollution.

[0005] A gasification slag water circulation system comprises:

[0006] A feeding and mixing device comprises a reaction kettle, a gasification slag feeding port, a circulating liquid inlet, a water supplementing port and a reaction kettle discharge port. The gasification slag feeding port, the circulating liquid inlet and the water supplementing port are arranged at the upper end of the reaction kettle, and the reaction kettle discharge port is arranged at the lower end of the reaction kettle. Gasification slag enters the reaction kettle from the gasification slag feeding port and mixes with water flowing in from the water supplementing port and the circulating liquid inlet to form a mixed liquid.

[0007] A two-stage sieving device comprises a shell, a first sieving structure, a second sieving structure, a feeding port and a water outlet. The first sieving structure and the second sieving structure are arranged in the shell. The first sieving structure is located at the upper end of the second sieving structure. The first sieving structure comprises a first rotary drum filter screen and a first spiral conveyor. The second sieving structure comprises a second rotary drum filter screen and a second spiral conveyor. The gasification slag filtered by the first rotary drum filter screen can enter the first spiral conveyor to reduce water content. The gasification slag filtered by the second rotary drum filter screen can enter the second spiral conveyor to reduce water content. The feeding port is arranged at the upper end of the shell and is in communication with the reaction kettle discharge port. The water outlet is arranged at the lower end of the shell. The mixed liquid flows out of the reaction kettle discharge port and enters the shell from the feeding port. After being filtered and drained by the first sieving structure and the second sieving structure in sequence, the mixed liquid flows out of the water outlet.

[0008] A cyclone is arranged with a residue discharge port, the cyclone is communicated with the circulating liquid inlet and the water outlet, the mixed liquid enters the cyclone to carry out solid-liquid separation, the remaining gasification residue is discharged through the residue discharge port and collected, and the water reenters the reaction kettle through the circulating liquid inlet.

[0009] By adopting the technical scheme, the device realizes efficient treatment of gasification residue and recycling of water resources through unique feeding mixing, two-stage screening and cyclone combination. In the feeding mixing device, the gasification residue and water are fully mixed to provide a suitable material state for subsequent screening. The two-stage screening structure gradually reduces the water content of the gasification residue through the design of the drum filter screen and the spiral conveying from the first stage to the second stage, and effectively separates gasification residues of different particle sizes. The cyclone further realizes solid-liquid separation, the water is recycled back to the reaction kettle, greatly reducing the water consumption and the secondary pollution risk caused by wastewater discharge, and having significant advantages in environmental protection and resource utilization.

[0010] In one of the embodiments, the outer part of the first spiral conveying and the outer part of the second spiral conveying are respectively provided with a cylindrical filter screen, the spiral interval of the first spiral conveying and the second spiral conveying is gradually reduced, and the rear end radius is gradually reduced.

[0011] By adopting the technical scheme, the cylindrical filter screen outside the first and second spiral conveyors ensures effective constraint of the material during spiral conveying. The design of gradually reducing the spiral interval and the rear end radius enables continuous and enhanced extrusion force on the gasification residue when the spiral conveying rotates, effectively extruding the water in the gasification residue, significantly reducing the water content, and making the gasification residue more convenient in subsequent use, transportation and storage.

[0012] In one of the embodiments, the shell is further provided with a first residue outlet and a second residue outlet, the first spiral conveying is connected with the first residue outlet, and the second spiral conveying is connected with the second residue outlet.

[0013] By adopting the technical scheme, the first residue outlet and the second residue outlet are respectively connected with the corresponding first spiral conveying and second spiral conveying, providing a convenient discharge channel for the treated gasification residue. This not only facilitates the collection of the treated gasification residue with reduced water content, which is conducive to subsequent reuse or disposal, but also ensures smooth operation of the device, avoids affecting the screening efficiency due to accumulation of gasification residue, and ensures continuous and stable operation of the entire device.

[0014] In one of the embodiments, the first screening structure further comprises a first driving member, the second screening structure further comprises a second driving member, and the gasified slag water circulation system further comprises an electric control box electrically connected with the first driving member and the second driving member, the first driving member being capable of driving the first drum filter screen and the first spiral conveyor to rotate, and the second driving member being capable of driving the second drum filter screen and the second spiral conveyor to rotate.

[0015] By adopting the above technical solution, the driving member drives the drum filter screen and the spiral conveyor to rotate, ensuring smooth flow and processing of the gasified slag in the equipment, greatly improving the screening efficiency, reducing manual intervention, and realizing automation and high efficiency of the equipment operation.

[0016] In one of the embodiments, the first screening structure further comprises a first scraping slag assembly capable of transferring the gasified slag on the first drum filter screen into the first spiral conveyor, and the second screening structure further comprises a second scraping slag assembly capable of transferring the gasified slag on the second drum filter screen into the second spiral conveyor.

[0017] By adopting the above technical solution, the first and second scraping slag assemblies solve the problem of adhesion and blockage of the gasified slag on the drum filter screen. They can timely transfer the gasified slag on the filter screen to the spiral conveying device, ensuring that the screening effect of the drum filter screen is always in good condition.

[0018] In one of the embodiments, the first scraping slag assembly comprises a first drum brush and a first scraping slag plate, the first drum filter screen is tangent to the first drum brush, one end of the first scraping slag plate abuts against the first drum filter screen, and the other end of the first scraping slag plate is connected with the first spiral conveyor, and the first driving member is further capable of driving the first drum brush to rotate; the second scraping slag assembly comprises a second drum brush and a second scraping slag plate, the second drum filter screen is tangent to the second drum brush, one end of the second scraping slag plate abuts against the second drum filter screen, and the other end of the second scraping slag plate is connected with the second spiral conveyor, and the second driving member is further capable of driving the second drum brush to rotate.

[0019] By adopting the above technical solution, the first and second drum brushes are tangent to the corresponding drum filter screens, which can effectively clean the gasified slag adhered to the filter screen and prevent the screen from being blocked. The first and second scraping slag plates accurately convey the cleaned gasified slag to the spiral conveying device. The driving member simultaneously drives the drum brush to rotate, ensuring the continuous cleaning effect of the brush.

[0020] In one of the embodiments, the two-stage screening device further comprises a first water baffle and a second water baffle, one end of the first water baffle is connected with the shell, and the other end is abutted against the first drum filter screen; one end of the second water baffle is connected with the shell, and the other end is abutted against the second drum filter screen.

[0021] By adopting the above technical solution, the first water baffle and the second water baffle are abutted against the first drum filter screen and the second drum filter screen respectively, which effectively prevents the mixed liquid from directly entering the subsequent section without being filtered by the filter screen, thereby ensuring the accuracy and effectiveness of the screening. At the same time, they can also prevent the gasified slag that has not passed through the filter screen from entering the next stage of screening, thereby avoiding the mixing of gasified slag with different particle sizes and ensuring the accuracy of each stage of screening, thereby improving the reliability of the entire screening system.

[0022] In one of the embodiments, the two-stage screening device further comprises a guide plate, the guide plate is located between the first drum filter screen and the second drum filter screen, one end of the guide plate is arranged in the shell, and the other end faces the second drum filter screen.

[0023] By adopting the above technical solution, by reasonably designing the angle and position of the guide plate, the falling point of the mixed liquid can be accurately controlled, so that the mixed liquid is uniformly distributed on the second drum filter screen, and the filtering area is fully utilized. This not only improves the efficiency of the second stage of screening, but also prolongs the service life of the second drum filter screen, thereby ensuring the high efficiency and stability of the entire screening process.

[0024] In one of the embodiments, the gasified slag water circulation system further comprises a first slag slurry pump and a second slag slurry pump, the first slag slurry pump is in communication with the discharge port and the feed port of the reaction kettle, and the second slag slurry pump is in communication with the water outlet and the cyclone.

[0025] By adopting the above technical solution, it is ensured that the mixed liquid can flow stably and continuously between the reaction kettle, the two-stage screening device and the cyclone according to the designed process, thereby ensuring the smooth progress of the entire multi-stage screening process of the gasified slag, and improving the operation stability and reliability of the equipment.

[0026] In one of the embodiments, the two-stage screening device is provided with a water distribution tank, a lower adjustable guide plate and an upper adjustable guide plate, the water distribution tank is arranged at the upper end of the shell and is in communication with the feed port, the water distribution tank is connected with the lower adjustable guide plate, and the upper adjustable guide plate is arranged on the shell and located directly above the lower adjustable guide plate.

[0027] By adopting the technical scheme, the distribution tank is communicated with the feeding port, so that the mixed liquid is uniformly distributed in the distribution tank before entering the first-stage roller filter screen. The combination of the lower adjustable flow guide plate and the upper adjustable flow guide plate can accurately control the flow direction and falling point of the mixed liquid, so that the mixed liquid is uniformly dropped to the specified position of the first-stage roller filter screen. This avoids local concentrated impact of the mixed liquid on the first-stage roller filter screen, ensures uniformity and efficiency of the first-stage screening, prolongs service life of the first-stage roller filter screen, and ensures stable operation of the whole equipment.

[0028] To sum up, the present application at least includes one beneficial effect:

[0029] 1. The device realizes efficient treatment of gasified slag and recycling of water resources through unique feeding and mixing, two-stage screening and cyclone combination. In the feeding and mixing device, the gasified slag and water are fully mixed to provide a suitable material state for subsequent screening. The two-stage screening structure gradually reduces the water content of the gasified slag through the design of the first-stage and second-stage roller filter screens and the spiral conveyor, and effectively separates gasified slag of different particle sizes. The cyclone further realizes solid-liquid separation, and the water is recycled back to the reaction kettle, greatly reducing the water consumption and the risk of secondary pollution caused by wastewater discharge, and having significant advantages in environmental protection and resource utilization.

[0030] 2. The first-stage and second-stage roller brushes are tangent to the corresponding roller filter screens, which can effectively clean the gasified slag adhering to the filter screens and prevent the screen from being blocked. The first-stage and second-stage slag scraping plates accurately convey the cleaned gasified slag to the spiral conveyor. The driving member simultaneously drives the rotation of the roller brushes, ensuring the continuous cleaning effect of the brushes.

[0031] 3. The first-stage and second-stage water baffle plates respectively abut against the first-stage and second-stage roller filter screens, effectively preventing the mixed liquid from directly entering the subsequent section without being filtered by the filter screen, ensuring the accuracy and effectiveness of the screening. At the same time, they can also prevent the gasified slag that has not passed through the filter screen from entering the next stage of screening, avoiding the mixing of gasified slag of different particle sizes, ensuring the accuracy of each stage of screening, and improving the reliability of the whole screening system. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a whole structure schematic diagram of a gasified slag water recycling system provided by an embodiment of the present application;

[0033] Figure 2 is a structure schematic diagram of a two-stage screening device provided by an embodiment of the present application;

[0034] Figure 3 is a structure schematic diagram of one side of a two-stage screening device provided by an embodiment of the present application;

[0035] Figure 4is a structural schematic view of another side of a two-stage screening device provided in the application.

[0036] Mark number explanation: 1, gasification slag water circulation system; 11, feed mixing device; 111, reaction kettle; 112, stirrer; 1121, stirring rod; 113, gasification slag feeding port; 114, circulating liquid inlet; 115, water supplementing port; 116, reaction kettle discharge port; 12, two-stage screening device; 121, shell; 1211, primary maintenance door; 1212, secondary maintenance door; 1213, water outlet; 1214, primary slag discharge port; 1215, secondary slag discharge port; 122, first screening structure; 1221, primary roller filter screen; 1222, primary slag scraping assembly; 1223, primary roller brush; 1224, primary slag scraping plate; 1225, primary screw conveyor; 1226, primary driving member; 123, second screening structure; 1231, secondary roller filter screen; 1232, secondary slag scraping assembly; 1233, secondary roller brush; 1234, secondary slag scraping plate; 1235, secondary screw conveyor; 1236, secondary driving member; 124, flow guide plate; 125, water distribution tank; 1251, upper adjustable flow guide plate; 1252, lower adjustable flow guide plate; 126, feeding port; 127, primary water baffle; 128, secondary water baffle; 13, cyclone; 14, electric control box; 15, first slag slurry pump; 16, second slag slurry pump. DETAILED DESCRIPTION

[0037] The following will be described in detail below with reference to the accompanying drawings Figures 1-4 The gasification slag water circulation system provided in the application will be described in further detail.

[0038] Embodiment 1

[0039] Please refer to Figures 1-4 The gasification slag water circulation system 1 provided in the embodiments of the application includes a feed mixing device 11, a two-stage screening device 12 and a cyclone 13.

[0040] The feed mixing device 11 includes a reaction kettle 111, a gasification slag feeding port 113, a circulating liquid inlet 114, a water supplementing port 115 and a reaction kettle discharge port 116, wherein the gasification slag feeding port 113, the circulating liquid inlet 114 and the water supplementing port 115 are all arranged at the upper end of the reaction kettle 111, and the reaction kettle discharge port 116 is arranged at the lower end of the reaction kettle 111. Specifically, the gasification slag can enter the reaction kettle 111 from the gasification slag feeding port 113, and the circulating liquid inlet 114 and the water supplementing port 115 can both supplement water into the reaction kettle 111, so that the gasification slag and the water are mixed in the reaction kettle 111 to form a mixed liquid which is then output through the reaction kettle discharge port 116.

[0041] The feeding mixing device 11 can further comprise a stirrer 112 arranged at the upper end of the reactor 111 and capable of stirring into the reactor 111. Specifically, the stirrer 112 can comprise a rotating member arranged at the upper end of the reactor 111 and connected with the upper end of a stirring rod 1121, and the lower end of the stirring rod 1121 extends into the reactor 111, and the shape of the stirring rod 1121 can be changed according to actual conditions. In this embodiment, the lower end of the stirring rod 1121 is in a U shape, and the rotating member can control the rotation of the stirring rod 1121 and stir most of the area in the reactor 111, so that the gasification slag and water can be fully mixed.

[0042] The two-stage screening device 12 comprises a shell 121, a first screening structure 122, a second screening structure 123, a feeding port 126 and a water outlet 1213, the first screening structure 122 and the second screening structure 123 are arranged in the shell 121 and the first screening structure 122 is located above the second screening structure 123, the feeding port 126 is arranged at the upper end of the shell 121 and communicates with the reactor outlet 116, and the water outlet 1213 is arranged at the lower end of the shell 121. The mixed liquid can enter the shell 121 from the feeding port 126 and pass through the first screening structure 122 and the second screening structure 123 for filtration, the large-particle gasification slag can be filtered out and the water content of the gasification slag can be reduced, and then the mixed liquid exits through the water outlet 1213.

[0043] The first screening structure 122 comprises a first drum filter screen 1221, a first screw conveyor 1225 and a first driving member 1226, and the second screening structure 123 comprises a second drum filter screen 1231, a second screw conveyor 1235 and a second driving member 1236. The outer part of the first screw conveyor 1225 and the second screw conveyor 1235 is provided with a cylindrical filter screen, the screw interval of the first screw conveyor 1225 and the second screw conveyor 1235 gradually decreases, and the rear end radius gradually decreases, the first driving member 1226 can drive the first drum filter screen 1221 and the first screw conveyor 1225 to rotate, and the second driving member 1236 can drive the second drum filter screen 1231 and the second screw conveyor 1235 to rotate.

[0044] Specifically, the filtering accuracy of the first roller filter screen 1221 is greater than that of the second roller filter screen 1231, so that the first roller filter screen 1221 and the second roller filter screen 1231 can filter gasified slag of different sizes. In this embodiment, the first roller filter screen 1221 can be made of stainless steel material, and the surface thereof is provided with micropores with a pore diameter of 0.3 mm. The pore diameter of the cylindrical filter screen outside the first spiral conveying device 1225 can also be 0.3 mm. The surface pore diameter of the second roller filter screen 1231 is 0.1 mm, and the pore diameter of the cylindrical filter screen outside the second spiral conveying device 1235 can also be 0.1 mm. The first spiral conveying device 1225 can be made of carbon steel material, and the diameter thereof gradually decreases, the front end diameter is 0.8 m, and the end diameter is 0.5 m. The pitch thereof also gradually decreases, the front end pitch is 0.3 m, and the end pitch is 0.1 m. The second spiral conveying device 1235 is designed similarly to adapt to the finer screening requirement. Such a design of the spiral conveying device can gradually compress the gasified slag, reduce the water content in the gasified slag, improve the dehydration effect, make the water flow out of the cylindrical filter screen outside the spiral conveying device, and prevent the gasified slag from falling from the cylindrical filter screen. The first driving member 1226 and the second driving member 1236 can be an electric motor or a hydraulic motor, and the specific selection depends on the actual conditions and requirements on site. For example, in the case of high accuracy and large torque, a hydraulic motor can be selected, and in the case of energy saving and simplified maintenance, an electric motor can be selected. The gasified slag on the first roller filter screen 1221 can be thrown to the inside of the first spiral conveying device 1225 by the action of its own gravity and the centrifugal force generated by rotation, and the connection mode between the second roller filter screen 1231 and the second spiral conveying device 1235 is the same. Such a design can ensure that the gasified slag does not block during transmission, and improves the working efficiency of the equipment.

[0045] The shell 121 is also provided with a first slag outlet 1214 and a second slag outlet 1215. The end of the first spiral conveying device 1225 communicates with the first slag outlet 1214, and the end of the second spiral conveying device 1235 communicates with the second slag outlet 1215. The gasified slag rotates in the first spiral conveying device 1225 and the second spiral conveying device 1235 and constantly moves towards the first slag outlet 1214 and the second slag outlet 1215 at the end, and finally the gasified slag after the precipitation operation can be collected. The outer part of the spiral blade of the first spiral conveying device 1225 and the second spiral conveying device 1235 can be provided with a detachable brush, which can effectively prevent the cylindrical filter screen outside the spiral conveying device from being blocked.

[0046] The gasified slag water circulation system 1 also includes an electric control box 14, which is electrically connected with the first driving member 1226 and the second driving member 1236. The electric control box 14 can centrally manage the power distribution of the entire equipment, ensure the cooperative work of various components, and improve the reliability and automation degree of the system.

[0047] The first screening structure 122 can further comprise a first slag scraping assembly 1222 capable of transferring the gasified slag on the first drum filter screen 1221 into the first screw conveyor 1225; similarly, the second screening structure 123 can further comprise a second slag scraping assembly 1232 capable of transferring the gasified slag on the second drum filter screen 1231 into the second screw conveyor 1235.

[0048] Specifically, the first slag scraping assembly 1222 can comprise a first drum brush 1223 and a first slag scraping plate 1224, the first drum filter screen 1221 is tangent to the first drum brush 1223, one end of the first slag scraping plate 1224 abuts against the first drum filter screen 1221 and the other end is connected to the first screw conveyor 1225, and the first driving member 1226 is further capable of driving the first drum brush 1223; the second slag scraping assembly 1232 comprises a second drum brush 1233 and a second slag scraping plate 1234, the second drum filter screen 1231 is tangent to the second drum brush 1233, one end of the second slag scraping plate 1234 abuts against the second drum filter screen 1231 and the other end is connected to the second screw conveyor 1235, and the second driving member 1236 is capable of driving the second drum brush 1233, and openings are formed on the outer drum filter screens of the first screw conveyor 1225 and the second screw conveyor 1235. The first drum brush 1223 and the second drum brush 1233 can be made of nylon or metal wire and have certain hardness and elasticity, which can effectively clean the gasified slag adhered to the drum filter screen during rotation and prevent the screen from being blocked. The end of the first slag scraping plate 1224 and the second slag scraping plate 1234 close to the drum filter screen can be provided with waterproof rubber, which not only prevents the unfiltered mixed liquid from entering the next process, but also cleans the gasified slag and transfers it from the openings on the corresponding drum filter screens into the corresponding screw conveyors, ensuring that the gasified slag enters the next process smoothly.

[0049] In addition, in order to further prevent the mixed liquid from directly entering the subsequent process without passing through the filter screen, a first water baffle 127 and a second water baffle 128 can be arranged in the shell 121. One end of the first water baffle 127 is fixed on the shell 121 and the other end abuts against the first drum filter screen 1221, and the first water baffle 127 and the first slag scraping plate 1224 are arranged at opposite ends of the first drum filter screen 1221 respectively; one end of the second water baffle 128 is fixed on the shell 121 and the other end abuts against the second drum filter screen 1231, and the second water baffle 128 and the second slag scraping plate 1234 are arranged at opposite ends of the second drum filter screen 1231 respectively. Specifically, the end of the water baffle close to the drum filter screen is also provided with waterproof rubber, which abuts against the drum filter screen, thereby effectively blocking the unfiltered mixed liquid and preventing the gasified slag that cannot pass through the filter screen from entering the next process, ensuring the filtering effect of each step.

[0050] The outer shell 121 is also provided with a guide plate 124 located between the first drum filter screen 1221 and the second drum filter screen 1231, one end of which is fixed on the outer shell 121 and the other end is directed towards the second drum filter screen 1231. The guide plate 124 serves to guide the mixed liquid that has passed through the first screen to above the second drum filter screen 1231, while controlling the landing point of the mixed liquid, maximizing the effective filtering area of the second drum filter screen 1231 and improving the overall filtering efficiency.

[0051] The outer shell 121 can also be provided with a water distribution tank 125, a lower adjustable guide plate 1252 and an upper adjustable guide plate 1251. The water distribution tank 125 is located at the upper end of the inner shell 121 and is in communication with the feed inlet 126, and the lower adjustable guide plate 1252 is connected to the water distribution tank 125. The upper adjustable guide plate 1251 is located above the lower adjustable guide plate 1252 in the outer shell 121. The mixed liquid overflows through the water distribution tank 125 and is uniformly distributed to the designated position of the first drum filter screen 1221 through the combined action of the upper adjustable guide plate 1251 and the lower adjustable guide plate 1252. The water distribution tank 125 is usually made of corrosion-resistant materials such as stainless steel or plastic to ensure that it is not easily damaged during long-term use. The lower adjustable guide plate 1252 and the upper adjustable guide plate 1251 can be manually or electrically adjusted in angle to flexibly adjust the distribution of the mixed liquid according to the actual working conditions. This design can maximize the use of the filtering area of the first drum filter screen 1221, improve the filtering efficiency and reduce material waste.

[0052] The outer shell 121 can also include a first maintenance door 1211 and a second maintenance door 1212. The first maintenance door 1211 is located on one side of the outer shell 121 near the first drum brush 1223, and the second maintenance door 1212 is located on one side of the outer shell 121 near the second drum brush 1233. The maintenance doors can be used to maintain and replace the first screening structure 122 and the second screening structure 123, and also facilitate the adjustment of other adjustable structures.

[0053] Specifically, the mixed liquid in the water distribution tank 125 falls downward and is filtered by the first drum filter screen 1221, then is filtered again by the second drum filter screen 1231 and enters the water outlet 1213. When the mixed liquid passes through the first drum filter screen 1221 and the second drum filter screen 1231, part of the gasified slag contained in the mixed liquid will be scraped off by the brush on the surface of the filter screen, and part of the gasified slag will remain inside the filter screen after entering the filter screen. Regular cleaning of the filter screen through the maintenance door can prevent the gasified slag from affecting the screening efficiency.

[0054] The cyclone 13 is provided with a slag discharge port, and the cyclone 13 is in communication with the circulating liquid inlet 114 and the water outlet 1213. The mixed liquid enters the cyclone 13 for solid-liquid separation, and the remaining gasified slag is discharged through the slag discharge port and collected. The water reenters the reaction kettle 111 through the circulating liquid inlet 114.

[0055] The gasification slag water circulation system 1 can further include a first slag slurry pump 15 and a second slag slurry pump 16. The first slag slurry pump 15 is in communication with the reactor outlet 116 and the feed inlet 126, and is responsible for transporting the mixed liquid from the reactor 111 to the two-stage screening device 12. The second slag slurry pump 16 is in communication with the water outlet 1213 and the cyclone 13, and is responsible for transporting the filtered mixed liquid into the cyclone 13 for further filtration and separation. The first slag slurry pump 15 and the second slag slurry pump 16 can be selected in wear-resistant and corrosion-resistant models to cope with the mixed liquid containing a large amount of solid particles. The pump body material can be cast iron or stainless steel, in addition, the flow and head of the pump should be matched according to the actual demand to ensure smooth and efficient operation of the system.

[0056] The implementation principle of the embodiment is: through the above design, the gasification slag is fully mixed with water after entering the reactor 111, and the formed mixed liquid enters the two-stage screening device 12 for step-by-step filtration and precipitation. The design of the first-stage drum filter screen 1221 and the first-stage spiral conveyor 1225 can effectively remove most of the water, while the second-stage drum filter screen 1231 and the second-stage spiral conveyor 1235 further refine the filtration process, ensuring that the final discharged gasification slag has low water content, facilitating subsequent transportation and storage. At the same time, the addition of the cyclone 13 realizes the recycling of water resources, reduces the water consumption, and reduces the risk of secondary pollution. This series of design significantly improves the efficiency and environmental performance of gasification slag treatment.

[0057] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gasification slag water circulation system, characterized by, The utility model relates to a kind of gasification slag treatment equipment, including: Feed mixing device (11), including reaction kettle (111), gasification slag feed port (113), circulating liquid inlet (114), make-up water port (115) and reaction kettle discharge port (116), the gasification slag feed port (113), the circulating liquid inlet (114) and the make-up water port (115) are all set in the upper end of the reaction kettle (111), the reaction kettle discharge port (116) is set in the lower end of the reaction kettle (111), gasification slag enters the reaction kettle (111) from the gasification slag feed port (113) and mixes with the water of the make-up water port (115) and the circulating liquid inlet (114) and forms mixed liquid; Two-stage screening device (12), including shell (121), first screening structure (122), second screening structure (123), feed port (126) and water outlet (1213), the first screening structure (122) and the second screening structure (123) are set in the shell (121), the first screening structure (122) is located in the upper end of the second screening structure (123), the first screening structure (122) includes primary drum filter screen (1221) and primary screw conveyor (1225), the second screening structure (123) includes secondary drum filter screen (1231) and secondary screw conveyor (1235), the primary drum filter screen (1221) can filter out gasification slag and then gasification slag enters the primary screw conveyor (1225) and reduces water, the secondary drum filter screen (1231) can further filter out gasification slag and then gasification slag enters the secondary screw conveyor (1235) and reduces water, the feed port (126) is set in the upper end of the shell (121) and is communicated with the reaction kettle discharge port (116), the water outlet (1213) is set in the lower end of the shell (121), mixed liquid flows out from the reaction kettle discharge port (116) and enters the shell (121) from the feed port (126), and after being filtered and drained in turn in the first screening structure (122) and the second screening structure (123), it flows out from the water outlet (1213); Cyclone (13) is equipped with slag discharge port, the cyclone (13) is communicated with the circulating liquid inlet (114) and the water outlet (1213), mixed liquid enters the cyclone (13) and separates solid-liquid, and remaining gasification slag is discharged and collected through the slag discharge port, and water reenters the reaction kettle (111) through the circulating liquid inlet (114).

2. The slag water circulation system according to claim 1, wherein The outer portion of the primary screw conveyor (1225) and the secondary screw conveyor (1235) is equipped with cylindrical filter screen, and the interval of the screw of the primary screw conveyor (1225) and the secondary screw conveyor (1235) is gradually reduced, and the radius of the rear end is gradually reduced.

3. The slag water circulation system according to claim 2, wherein The shell (121) is also provided with a first-stage slag outlet (1214) and a second-stage slag outlet (1215), the first-stage screw conveyor (1225) is connected with the first-stage slag outlet (1214), and the second-stage screw conveyor (1235) is connected with the second-stage slag outlet (1215).

4. The slag water circulation system according to claim 3, wherein The first screening structure (122) further comprises a first-stage driving member (1226), the second screening structure (123) further comprises a second-stage driving member (1236), and the gasified slag water circulation system (1) further comprises an electric control box (14) electrically connected with the first-stage driving member (1226) and the second-stage driving member (1236), the first-stage driving member (1226) can drive the first-stage rotary drum filter screen (1221) and the first-stage screw conveyor (1225) to rotate, and the second-stage driving member (1236) can drive the second-stage rotary drum filter screen (1231) and the second-stage screw conveyor (1235) to rotate.

5. The slag water circulation system according to claim 4, wherein The first screening structure (122) further comprises a first-stage slag scraping assembly (1222) capable of transmitting the gasified slag on the first-stage rotary drum filter screen (1221) into the first-stage screw conveyor (1225), and the second screening structure (123) further comprises a second-stage slag scraping assembly (1232) capable of transmitting the gasified slag on the second-stage rotary drum filter screen (1231) into the second-stage screw conveyor (1235).

6. The slag water circulation system according to claim 5, wherein The first-stage slag scraping assembly (1222) comprises a first-stage rotary drum brush (1223) tangent to the first-stage rotary drum filter screen (1221) and a first-stage slag scraping plate (1224) abutting one end of the first-stage rotary drum filter screen (1221) and connected with the first-stage screw conveyor (1225) at the other end, and the first-stage driving member (1226) can further drive the first-stage rotary drum brush (1223) to rotate; the second-stage slag scraping assembly (1232) comprises a second-stage rotary drum brush (1233) tangent to the second-stage rotary drum filter screen (1231) and a second-stage slag scraping plate (1234) abutting one end of the second-stage rotary drum filter screen (1231) and connected with the second-stage screw conveyor (1235) at the other end, and the second-stage driving member (1236) can further drive the second-stage rotary drum brush (1233) to rotate.

7. The slag water circulation system of claim 1, wherein, The two-stage screening device (12) further comprises a first-stage water baffle (127) and a second-stage water baffle (128), one end of the first-stage water baffle (127) is connected with the shell (121), and the other end abuts against the first-stage rotary drum filter screen (1221); one end of the second-stage water baffle (128) is connected with the shell (121), and the other end abuts against the second-stage rotary drum filter screen (1231).

8. The slag water circulation system according to claim 7, wherein The two-stage screening device (12) further comprises a guide plate (124) located between the first-stage roller screen (1221) and the second-stage roller screen (1231), one end of the guide plate (124) being arranged in the shell (121) and the other end facing the second-stage roller screen (1231).

9. The slag water circulation system of claim 1, wherein, The gasification slag water circulation system (1) further comprises a first slag slurry pump (15) and a second slag slurry pump (16), the first slag slurry pump (15) being in communication with the reactor outlet (116) and the feed inlet (126), and the second slag slurry pump (16) being in communication with the water outlet (1213) and the cyclone (13).

10. The slag water circulation system of claim 1, wherein, The two-stage screening device (12) is provided with a water distribution tank (125), a lower adjustable guide plate (1252) and an upper adjustable guide plate (1251), the water distribution tank (125) being arranged at the upper end of the shell (121) and in communication with the feed inlet (126), the water distribution tank (125) being connected with the lower adjustable guide plate (1252), and the upper adjustable guide plate (1251) being arranged in the shell (121) and located directly above the lower adjustable guide plate (1252).

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