A biochemical sludge treatment system

Abstract

This invention belongs to the field of sludge treatment and co-firing technology, specifically relating to a biochemical sludge treatment system. The system includes a coal impurity removal mechanism, a biochemical sludge tank, a conveying pump, a mixing mechanism, a rod mill, and a gasifier. Both the coal impurity removal mechanism and the biochemical sludge tank are connected to the mixing mechanism. The mixing mechanism is connected to the rod mill via the conveying pump, and the rod mill is connected to the gasifier. The coal impurity removal mechanism includes a frame, a first conveyor belt, a fixed frame, a collection box, and a second conveyor belt. The first conveyor belt is fixedly connected to the frame, and the fixed frame is also fixedly connected to the frame. The fixed frame cooperates with the second conveyor belt, and the first and second conveyor belts cooperate with each other. A magnet is installed inside the second conveyor belt, and the magnet is arranged parallel to the first conveyor belt. The collection box is fixedly connected to the fixed frame and cooperates with the second conveyor belt. This solution addresses the problem of metallic impurities in coal mines.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment and co-firing technology, specifically relating to a biochemical sludge treatment system. Background Technology

[0002] Sludge is a highly water-content flocculent substance composed of various microorganisms and organic and inorganic particles. It accumulates impurities and salts from the raw water treatment process. Some pollutants can dissolve in water, causing water pollution. Some sludge also contains a large amount of toxic and harmful substances. If not properly treated and disposed of, it can cause great damage to human health and the ecological environment. Currently, common sludge treatment methods include landfill, composting, and incineration, with landfill being the primary method. The pollution and "secondary pollution" problems caused by unregulated sludge treatment are becoming increasingly serious.

[0003] Currently, sludge treatment involves co-firing sludge with coal for power generation. A commercially available device (approved by CN220224098U) for co-firing activated sludge includes a sludge tank connected to a sludge screw pump; the inlet pipeline of the sludge screw pump connected to the sludge tank; the outlet pipeline of the sludge screw pump connected to a sludge conveying pipeline; the sludge conveying pipeline connected to a shut-off valve via a flange; the sludge conveying pipeline connected to a gasification wastewater pipeline; the gasification wastewater pipeline connected to the inlet of a rod mill; and the rod mill connected to a coal slurry pump and a gasifier. This invention utilizes this device to treat sludge, reducing the amount of chemicals used and fully utilizing the calorific value of activated sludge, thus achieving resource utilization of activated sludge while avoiding environmental pollution, resulting in significant social and economic benefits.

[0004] However, some problems also exist: 1. Rod mills require a large amount of water, which is a waste of water resources. 2. Metal impurities in coal mines can easily damage the steel rods in the rod mill. 3. Coal mines also contain non-metallic impurities, such as plastic bags, which can easily clog the feed pipes during coal processing. Summary of the Invention

[0005] This invention provides a biochemical sludge treatment system to address the problem of metallic impurities in coal mines.

[0006] This solution provides a biochemical sludge treatment system, including a coal impurity removal mechanism, a biochemical sludge tank, a conveying pump, a mixing mechanism, a rod mill, and a gasifier. The coal impurity removal mechanism and the biochemical sludge tank are both connected to the mixing mechanism. The mixing mechanism is connected to the rod mill through the conveying pump. The rod mill is connected to the gasifier.

[0007] The coal impurity removal mechanism includes a frame, a first conveyor belt, a fixed frame, a collection box, and a second conveyor belt. The first conveyor belt is fixedly connected to the frame, the fixed frame is fixedly connected to the frame, the fixed frame cooperates with the second conveyor belt, the first conveyor belt cooperates with the second conveyor belt, a magnet is provided on the inner side of the second conveyor belt, the collection box is fixedly connected to the fixed frame, and the collection box cooperates with the second conveyor belt.

[0008] The principle of this solution is as follows: Biochemical sludge with a moisture content ≥98% is obtained through sedimentation in a sludge tank. Then, coal is fed onto the first conveyor belt of the coal impurity removal mechanism. The operator starts the motors on the first and second conveyor belts, which then begin running in opposite directions, with the second conveyor belt positioned above the first. When the first conveyor belt transports coal to below the second conveyor belt, magnets inside the second conveyor belt attract metal from the coal onto the belt. As the belt rolls, the metal impurities are carried to the vicinity of the collection box. Since there are no magnets there, the metal impurities fall due to gravity and enter the collection box, thus completing the impurity removal process.

[0009] The two materials are then mixed in a specific ratio in a mixing mechanism. The mixed material is then ground in a rod mill and finally sent to a gasifier for combustion and power generation.

[0010] The beneficial effects of this solution are: 1. Because the sludge contains a large amount of water, the amount of water added to the rod mill will be greatly reduced, saving water resources. 2. Metal impurities in the coal are removed using magnets, preventing the coal from damaging the steel rods inside the rod mill.

[0011] Furthermore, it also includes a scraper, which cooperates with the second conveyor belt and is fixedly connected to a fixing frame. The scraper is located on the left side of the second conveyor belt, so that it can scrape off impurities adhering to the second conveyor belt, and above the collection box, the impurities scraped off by the scraper fall directly into the collection box.

[0012] Furthermore, it also includes a cleaning mechanism, which includes a spring and a deflector plate. The deflector plate is fixedly connected to the belt of the second conveyor belt. The scraper cooperates with the deflector plate. One end of the spring is fixedly connected to the scraper plate, and the other end is fixedly connected to the fixed frame.

[0013] Over long-term operation, the scraper can easily accumulate impurities, leading to a decrease in its effectiveness. This mechanism addresses this by using a deflector plate mounted on the second conveyor belt. With each rotation of the second conveyor belt, the deflector plate contacts the scraper, causing it to be pushed upwards and then oscillate up and down under the action of a spring, shaking off the impurities.

[0014] Furthermore, it also includes multiple plastic hooks, which are equidistantly and fixedly connected to each other. These plastic hooks cooperate with the scraper and the first conveyor belt. The plastic hooks can catch plastic bags and are used to remove plastic bags from the coal inside the first conveyor belt.

[0015] Furthermore, the plastic hook and the scraper are connected by a linkage mechanism, which includes a gear, a rack, and a rotating shaft. The scraper is fixedly connected to the rack, and the scraper and the spring are fixedly connected by the rack. The gear meshes with the rack, the gear is fixedly connected to the rotating shaft, the rotating shaft is rotatably connected to the fixed frame, and the plastic hook is fixedly connected to the rotating shaft.

[0016] Excessive plastic bag residue adhering to the plastic hooks can clog the first conveyor belt, causing material blockage. This mechanism addresses this by using a toggle plate to move the scraper upwards. This upward movement causes the rack to move upwards, which in turn drives a gear to rotate. The gear then rotates a shaft, which in turn rotates the plastic hooks until they reach an inverted position, emptying the adhered plastic bag into the collection box. After the toggle plate completes its rotation, the scraper returns to its original position, and the plastic hooks return to their original positions to continue removing plastic bags. This mechanism automatically cleans the plastic bags from the hooks periodically to prevent excessive accumulation and subsequent blockage of the first conveyor belt.

[0017] Furthermore, it also includes an adsorption mechanism, which includes a fan, an air suction pipe, and a slag storage box. The air suction pipe is connected to a plastic hook, the air suction pipe is connected to the fan, and the air suction pipe is connected to the slag storage box.

[0018] Some plastic bags adhere tightly to the plastic hooks, making them difficult to fall off. Furthermore, when the scraper is turned, impurities on them scatter everywhere instead of falling into the collection bin. This mechanism solves these problems by activating a blower when the scraper is turned, aligning the suction pipe with the position where the plastic hook flips, and the scraper is also positioned at that point. At this time, the plastic bags and the metal impurities shaken off by the scraper are sucked into the suction pipe and into the slag storage bin.

[0019] Furthermore, an electromagnet is installed inside the slag storage box, and a pressure switch is installed on the scraper. The pressure switch is electrically connected to the blower, and the electromagnet is aligned with the suction pipe. When the actuating mechanism moves the scraper, the pressure switch on the scraper is triggered, and the blower starts. Since the plastic hook is located in front of the scraper, the plastic bag will first be sucked into the suction pipe, and then the metal objects on the scraper will also be sucked into the suction pipe. When the plastic bag enters the slag storage box, the metal impurities will also enter the slag storage box. The metal impurities will be attracted to the electromagnet, and at the same time, they will press down on the plastic bag to prevent it from floating out.

[0020] Furthermore, it also includes a limiting plate to restrict the angle of the plastic hook. The limiting plate is fixedly connected to the fixing frame and cooperates with the plastic hook. The limiting plate is located behind the plastic hook and can prevent the plastic hook from being flipped over by the impact force of the coal when it hooks the plastic bag inside the coal.

[0021] Furthermore, the first conveyor belt is equipped with a baffle to prevent raw materials from flowing out. The baffle prevents material from falling off the first conveyor bag.

[0022] Furthermore, it also includes a base, which comprises support legs and rollers. One end of the support leg is fixedly connected to the frame, and the other end is rotatably connected to the roller. A brake disc is provided at the roller. This mechanism facilitates the movement of the entire coal impurity removal mechanism.

[0023] Furthermore, the slag storage box and the suction pipe are detachably connected, and a contact switch is installed at the connection point. The contact switch is connected to the electromagnet's wire. When the operator needs to clean the slag in the storage box, they only need to detach it, the contact switch will disconnect, the electromagnet will be de-energized, and the impurities can be easily poured out. Compared to existing mechanisms, this mechanism ensures that most impurities remain in the storage box, making it convenient for workers to clean. Attached Figure Description

[0024] Figure 1 This is a structural diagram of a coal impurity removal mechanism in a biochemical sludge treatment system.

[0025] Figure 2 This is a cross-sectional view of a coal impurity removal mechanism in a biochemical sludge treatment system.

[0026] Figure 3 This is an enlarged view of a coal impurity removal mechanism in a biological sludge treatment system.

[0027] Figure 4 This is a flow chart of a biochemical sludge treatment system.

[0028] The reference numerals in the accompanying drawings include: 1. Frame; 2. Base; 3. Roller; 4. Fixing frame; 5. Baffle; 6. Actuating plate; 7. Second conveyor belt; 8. Collection box; 9. Plastic hook; 10. First conveyor belt; 11. Suction pipe; 12. Slag storage box; 13. Fan; 14. Rack and pinion; 15. Spring; 16. Gear; 17. Scraper; 18. Magnet; 19. Electromagnet. Detailed Implementation

[0029] Basic as Figure 1 , Figure 4 As shown:

[0030] This solution provides a biochemical sludge treatment system, including a coal impurity removal mechanism, a biochemical sludge tank, a conveying pump, a mixing mechanism, a rod mill, and a gasifier. The coal impurity removal mechanism and the biochemical sludge tank are both connected to the mixing mechanism. The mixing mechanism is connected to the rod mill through the conveying pump. The rod mill is connected to the gasifier.

[0031] The coal impurity removal mechanism includes a frame 1, a first conveyor belt 10, a fixed frame 4, a collection box 8, and a second conveyor belt 7. The first conveyor belt 10 is fixedly connected to the frame 1, and the fixed frame 4 is fixedly connected to the frame 1. The fixed frame 4 is fixed above the second conveyor belt 7 and is parallel to the second conveyor belt 7. The distance between the first conveyor belt 10 and the second conveyor belt 7 is higher than the height of the material. A magnet 18 is provided on the inner side of the second conveyor belt 7. The magnet 18 has a baffle to prevent metal impurities from bypassing the belt and being attracted to the magnet 18. The magnet 18 is arranged parallel to the first conveyor belt 10. The collection box 8 is fixedly connected to the fixed frame 4. The collection box 8 is located below the second conveyor belt 7 and is higher than the first conveyor belt 7. The collection box 8 is located in the gap between the fixed frame and the second conveyor belt 7. The overall length of the magnet 18 is the length of the second conveyor belt 7, but there is no magnet at the end of the second conveyor belt 7.

[0032] It also includes a scraper 17, which is parallel to the second conveyor belt 7 and located at the left end of the second conveyor belt 7. The scraper 17 and the second conveyor belt 7 are fitted with a gap, which is insufficient to allow metal impurities to pass through. The scraper 17 is fixedly connected to the fixing frame 4. The scraper 17 is located on the left side of the second conveyor belt 7, so that the scraper 17 can scrape off the impurities adhering to the second conveyor belt 7 and is above the collection box 8. The impurities scraped by the scraper 17 fall directly into the collection box 8.

[0033] It also includes a cleaning mechanism, which includes a spring 15 and a toggle plate 6. The toggle plate 6 is fixedly connected to the belt of the second conveyor belt 7. The height of the toggle plate 6 is such that the second conveyor belt 7 can touch the scraper 17 every time it rotates. One end of the spring 15 is fixedly connected to the scraper 17, and the other end is fixedly connected to the fixing frame 4.

[0034] Over long-term operation, scraper 17 can easily accumulate a lot of impurities, which will lead to a decrease in the effectiveness of scraper 17. This mechanism uses a deflector plate set on the belt of the second conveyor belt 7. When the second conveyor belt 7 rotates once, the deflector plate will contact scraper 17, causing scraper 17 to be deflected upwards. Then, under the action of spring 15, it will swing up and down to shake off the impurities on scraper 17.

[0035] As attached Figure 2 , Figure 3 As shown:

[0036] It also includes plastic hooks 9, of which multiple plastic hooks 9 are provided and are fixedly connected to each other at equal intervals. The plastic hooks 9 are at a certain distance from the first conveyor belt 10, so that the plastic hooks 9 will not touch the first conveyor belt 10, but can contact the coal on the first conveyor belt 10. The plastic hooks 9 can hook plastic bags and are used to remove plastic bags from the coal on the first conveyor belt 10.

[0037] The plastic hook 9 is connected to the scraper 17 through a linkage mechanism, which includes a gear 16, a rack 14, and a rotating shaft. The scraper 17 is fixedly connected to the rack 14, and the scraper 17 is fixedly connected to the spring 15 through the rack 14. The gear 16 meshes with the rack 14, and the gear 16 is fixedly connected to the rotating shaft. The rotating shaft is rotatably connected to the fixed frame 4, and the plastic hook 9 is fixedly connected to the rotating shaft.

[0038] Excessive plastic bag adhesion to the plastic hook 9 can cause blockage of the first conveyor belt 10, leading to material congestion. When the scraper 17 is moved upwards by the actuating plate 6, the scraper 17 moves upwards, causing the rack 14 to move upwards. The rack 14 drives the gear 16 to rotate, which in turn drives the rotating shaft to rotate. The rotating shaft then drives the plastic hook 9 to rotate until it reaches an inverted position, emptying the plastic bag adhering to it into the collection box 8. After the actuating plate 6 finishes moving, the scraper 17 returns to its original position, and the plastic hook 9 returns to its original position to continue removing the plastic bag. This mechanism automatically cleans the plastic bags from the plastic hook 9 periodically to prevent excessive accumulation of plastic bags and blockage of the first conveyor belt 10.

[0039] It also includes an adsorption mechanism, which includes a fan 13, an air suction pipe 11 and a slag storage box 12. The air inlet of the air suction pipe 11 is aligned with the plastic hook 9 and the scraper 17. The air suction pipe 11 is connected to the fan 13 and the slag storage box 12.

[0040] Some plastic bags adhere tightly to the plastic hooks 9, making them difficult to fall off. Furthermore, when the scraper 17 is moved, impurities on them scatter and don't all fall into the collection bin 8. This mechanism activates the blower 13 when the scraper 17 is moved, drawing air in. The suction pipe 11 is aligned with the position where the plastic hooks 9 are flipped, and the scraper 17 is also positioned at that point. At this time, the plastic bags and the metal impurities shaken off by the scraper 17 are sucked into the suction pipe 11 and into the slag storage bin 12. This mechanism solves the aforementioned problems.

[0041] An electromagnet 19 is installed inside the slag storage box 12, and a pressure switch is installed on the scraper 17. The pressure switch is electrically connected to the blower 13. The electromagnet 19 is aligned with the suction pipe 11, and the blower 13 is equipped with a timer. When the actuating mechanism moves the scraper 17, the pressure switch on the scraper 17 is triggered, and the blower 13 starts. Due to the effect of the timer, after the actuating plate 6 leaves the scraper 17, the blower 13 will still run for a period of time while the scraper 17 is vibrating. Since the plastic hook 9 is located in front of the scraper 17, the plastic bag will first be sucked into the suction pipe 11, and then the metal material on the scraper 17 will also be sucked into the suction pipe 11. When the plastic bag enters the slag storage box 12, the metal impurities will also enter the slag storage box 12. The metal impurities will be attracted to the electromagnet 19, and at the same time, they will press down on the plastic bag to prevent it from floating out.

[0042] It also includes a limiting plate that restricts the angle of the plastic hook 9. The limiting plate is fixedly connected to the fixing frame 4 and can limit the angle of the plastic hook 9. The limiting plate is located behind the plastic hook 9 and can prevent the plastic hook 9 from being overturned by the impact force of the coal when it hooks the plastic bag in the coal.

[0043] The first conveyor belt 10 is equipped with a baffle 5 to prevent raw materials from flowing out. The baffle 5 prevents materials from falling off the first conveyor bag.

[0044] It also includes a base 2, which consists of support legs and rollers 3. One end of the support leg is fixedly connected to the frame 1, and the other end is rotatably connected to the rollers 3. A brake disc is provided at the rollers 3. This mechanism facilitates the movement of the entire coal impurity removal mechanism.

[0045] The slag storage box 12 and the suction pipe 11 are detachably connected, and a contact switch is installed at the connection point. The contact switch is connected to the electromagnet 19 by wire. When the operator needs to clean the slag storage box 12, they only need to detach it, the contact switch will be turned off, the electromagnet 19 will be de-energized, and the impurities can be easily poured out. Compared with existing mechanisms, this mechanism can ensure that most impurities are kept in the slag storage box 12, making it convenient for workers to clean.

[0046] As attached Figure 1-4 As shown:

[0047] This project utilizes three Texaco coal-water slurry gasifiers (two operating and one standby) with a coal feed rate of 1000t / d to co-process biochemical sludge with a moisture content ≥98% from various wastewater treatment plants within the plant area. (Currently, the biochemical sludge from the wastewater treatment plants is concentrated in a thickening tank and then processed by a centrifuge, resulting in a sludge moisture content of approximately 88%, with a biochemical sludge production of approximately 1500t / a.) The processing capacity is 1500t / a (moisture content ≥98%, dry sludge 180t / a). The slurry preparation water usage in the gasification workshop is 35-40 m³ / h, including 15 m³ / h of fresh water, 20 m³ / h of shift condensate, and 2 m³ / h of sulfur recovery waste liquid.

[0048] Two new transfer pumps will be installed (one operational and one standby), and a DN150 pipeline will be configured to connect to the gasification workshop. The outlet pressure must be no less than 0.5 MPa, and the flow rate no less than 15 m³ / h. A matching flushing water pipeline and a remote flow meter will be added to directly supply the flushing water to the inlets of the two rod mills in the gasification workshop. After the change, the biochemical sludge generated by the wastewater treatment plant will not undergo dewatering or temporary storage. It will be directly concentrated in a sludge tank from a moisture content ≥98% to a solids content of 5%, and then pumped through a newly constructed sludge transfer pipeline to the gasification rod mills to be processed into coal slurry together with coal. This slurry will then enter the gasifier for co-processing (the transfer will use a closed pipeline, regulated by a regulating valve and metered by a flow meter, before being delivered to the coal mills separately; no temporary storage will be provided). The flow rate will be controlled at 5 m³ / h. To ensure the safety of rod mill maintenance, a manual valve and a figure-eight blind flange will be installed before the pipeline enters the rod mill. The biochemical sludge has a high moisture content. After the technical upgrade, the water consumption of the rod mill for pulping will be reduced by approximately 5 m³ / h. The reduced water consumption is fresh water. Based on an annual operation of 330 days, the annual water saving is 39,600 m³ / h. The amount of sludge after solidification is approximately 180 t / a, and the blending ratio is 0.002% of the raw coal, which is extremely small.

[0049] After the technical upgrade, the coal mill's water consumption for slurry production will be reduced by approximately 39,600 tons per year. This reduction is from the original water consumption of fresh water, resulting in annual savings of approximately RMB 39,600 in purchased water costs (RMB 1 / ton * 39,600 tons per year). Simultaneously, annual savings will be approximately RMB 225,000 in biochemical sludge hazardous waste disposal costs (RMB 150 / ton * 1500 tons per year), RMB 432,000 in labor costs, RMB 75,000 in woven bag costs, RMB 412,500 in water treatment chemical costs, and RMB 191,000 in centrifuge electricity costs (total motor power 80.5 * 24 hours * RMB 0.3 / kWh * 330 days = RMB 191,268), totaling cost savings of RMB 1,375,100 per year.

[0050] The principle of this scheme is as follows: Biochemical sludge with a moisture content ≥98% is obtained through sedimentation in a sludge tank. Then, coal is sent to the first conveyor belt 10 of the coal impurity removal mechanism. The operator starts the motors on the first conveyor belt 10 and the second conveyor belt 7, which begin to run in opposite directions. The second conveyor belt 7 is positioned above the first conveyor belt 10. When the first conveyor belt 10 transports coal to below the second conveyor belt 7, the magnet 18 inside the second conveyor belt 7 attracts metal from the coal onto the belt. As the belt of the second conveyor belt 7 rolls, it carries the metal impurities to the vicinity of the collection box 8. Since there are no magnets 18 there, the metal impurities fall with gravity into the collection box 8. However, some metal impurities remain adhered to the second conveyor belt 7. At this point, the scraper 17 scrapes them off at the left end to prevent too much metal impurity from adhering to the second conveyor belt 7, which could cause it to slip or jam.

[0051] When scraper 17 scrapes away metal impurities for a long time, a lot of metal impurities may accumulate at the front end of scraper 17, causing scraper 17 to hit the second conveyor belt 7 and damage the device. At this time, the cleaning mechanism uses a deflector plate 6 set on the belt of the second conveyor belt 7. When the second conveyor belt 7 rotates once, the deflector plate will contact scraper 17, causing scraper 17 to be pushed upward. Then, under the action of spring 15, it will swing up and down to shake off the impurities on scraper 17.

[0052] Meanwhile, coal contains many non-metallic impurities, such as plastic bags. Due to the elasticity of plastic bags, they can easily clog pipelines during coal transportation. Therefore, this device uses plastic hooks 9 to remove plastic bags from the coal on the first conveyor belt 10. However, excessive plastic bag residue adhering to the plastic hooks 9 can clog the first conveyor belt 10, causing material blockage. When the scraper 17 is moved by the actuating plate 6, the scraper 17 moves upward, causing the rack 14 to move upward. The rack 14 drives the gear 16 to rotate, which in turn drives the rotating shaft to rotate. The rotating shaft then drives the plastic hooks 9 to rotate until they reach an inverted position, emptying the plastic bag residue adhering to them into the collection box 8. After the actuating plate 6 finishes moving, the scraper 17 returns to its original position, and the plastic hooks 9 return to their original position to continue removing plastic bags. This mechanism automatically cleans the plastic bags off the plastic hooks 9 periodically to prevent excessive accumulation of plastic bags, which could clog the first conveyor belt 10.

[0053] Some plastic bags adhere tightly to the plastic hook 9, making them difficult to fall off. Furthermore, when the scraper 17 is turned, impurities on it scatter and don't all fall into the collection bin 8. In this mechanism, when the scraper 17 is turned, the blower 13 starts to draw air in. The suction pipe 11 is aligned with the position where the plastic hook 9 flips, and the scraper 17 is also in that position. At this time, the plastic bag and the metal impurities shaken off by the scraper 17 are sucked into the suction pipe 11 and into the slag storage bin 12. Because the plastic hook 9 is located in front of the scraper 17, the plastic bag is first sucked into the suction pipe 11, and then the metal matter on the scraper 17 is also sucked into the suction pipe 11. When the plastic bag reaches the slag storage bin 12, the metal impurities also enter the bin. The metal impurities are attracted to the electromagnet 19, which simultaneously holds the plastic bag down, preventing it from scattering. When the operator needs to clean the slag storage bin 12, simply disassemble it, disconnect the contact switch, de-energize the electromagnet 19, and the impurities can be easily poured out. Compared to existing mechanisms, this mechanism ensures that most impurities are contained within the slag storage box 12, facilitating cleaning by staff. The coal impurity removal mechanism completes the impurity removal process.

[0054] The two materials are then mixed in a specific ratio in a mixing mechanism. The mixed material is then ground in a rod mill and finally sent to a gasifier for combustion and power generation.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A biochemical sludge treatment system comprising a coal impurity removing mechanism, a biochemical sludge tank, a delivery pump, a mixing mechanism, a rod mill, and a gasifier, characterized by, The coal impurity removing mechanism and the biochemical sludge pool are communicated with the mixing mechanism, the mixing mechanism is communicated with the rod mill through the conveying pump, and the rod mill is connected with the gasification furnace; The coal impurity removing mechanism includes a rack (1), a first conveyor belt (10), a fixing frame (4), a collecting box (8) and a second conveyor belt (7), the first conveyor belt (10) is fixedly connected with the rack (1), the fixing frame (4) is fixedly connected with the rack (1), the fixing frame (4) is matched with the second conveyor belt (7), the first conveyor belt (10) is matched with the second conveyor belt (7), a magnet (18) is arranged on the inner side of the second conveyor belt (7), the collecting box (8) is fixedly connected with the fixing frame (4), the collecting box (8) is matched with the second conveyor belt (7), the first conveyor belt (10) is parallel to the second conveyor belt (7), the first conveyor belt (10) is located below the second conveyor belt (7), and the collecting box (8) is located below the second conveyor belt (7); A scraper (17) is further arranged, the scraper (17) is matched with the second conveyor belt (7), the scraper (17) is located at the left end of the second conveyor belt (7), the scraper (17) is gap-connected with the second conveyor belt (7), the gap is not enough for metal impurities to pass through, and the impurities scraped by the scraper (17) directly fall into the collecting box (8); A cleaning mechanism is further arranged, the cleaning mechanism includes a spring (15) and a pushing plate (6), the pushing plate (6) is fixedly connected with the belt of the second conveyor belt (7), the scraper (17) is matched with the pushing plate (6), one end of the spring (15) is fixedly connected with the scraper (17), and the other end is fixedly connected with the fixing frame (4); when the second conveyor belt rotates one circle, the pushing plate contacts the scraper, the scraper is pushed upward, then the scraper swings up and down under the action of the spring, and the impurities on the scraper are shaken off; A plurality of plastic hooks (9) are further arranged, the plastic hooks (9) are fixedly connected with each other at equal intervals, the plastic hooks (9) are matched with the scraper (17), and the plastic hooks (9) are matched with the first conveyor belt (10); the plastic hooks (9) can hook plastic bags, and the plastic hooks (9) are used for removing the plastic bags in the coal on the first conveyor belt (10); the plastic hooks (9) are connected with the scraper (17) through a linkage mechanism, the linkage mechanism includes a gear (16), a rack (14) and a rotating shaft, the scraper (17) is fixedly connected with the rack (14), the scraper (17) is fixedly connected with the spring (15) through the rack (14), the gear (16) is engaged with the rack (14), the gear (16) is fixedly connected with the rotating shaft, the rotating shaft is rotatably connected with the fixing frame (4), and the plastic hooks (9) are fixedly connected with the rotating shaft; the scraper (17) moves upward, the rack (14) moves upward, the rack (14) drives the gear (16) to rotate, the gear (16) drives the rotating shaft to rotate, the rotating shaft drives the plastic hooks (9) to rotate, the plastic hooks (9) rotate to an inverted state, and the plastic bags adhered to the plastic hooks (9) are poured into the collecting box (8). It also includes adsorption mechanism, the adsorption mechanism includes fan (13), suction pipe (11) and residue tank (12), the suction pipe (11) is matched with plastic hook (9), the suction pipe (11) is communicated with fan (13), the suction pipe (11) is communicated with residue tank (12); The residue tank (12) is provided with an electromagnet (19), the scraper (17) is provided with a pressure switch, the pressure switch is electrically connected with the fan (13), the electromagnet (19) is aligned with the suction pipe (11); The air inlet of the suction pipe (11) is aligned with the plastic hook (9) and the scraper (17).

2. The biochemical sludge treatment system according to claim 1, characterized in that It also includes a limiting plate for limiting the angle of the plastic hook (9), the limiting plate is fixedly connected with the fixed frame (4), and the limiting plate is matched with the plastic hook (9).

3. The biochemical sludge treatment system according to claim 1, characterized in that The first conveyor belt (10) is provided with a baffle (5) for preventing the outflow of raw materials.

4. The biochemical sludge treatment system according to claim 1, characterized in that It also includes a base (2), the base (2) includes support legs and rollers (3), one end of the support legs is fixedly connected with the rack (1), the other end is rollingly connected with the rollers (3), and the rollers (3) are provided with brake discs.

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