Coal slime circulating treatment device and method
By reusing the black water from the bottom of the settlement tank to the rod mill and the filtrate tank to recover the pressure filtrate as slurry replenishment, combined with the hyperbolic buffer tank design, the problems of low residual carbon utilization and large external discharge of solid waste in gasified coal slime treatment are solved, and efficient recycling and environmental compliance improvement of coal slime are achieved.
Patent Information
- Application Number
- CN202510663867.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2025-07-01
AI Technical Summary
In the prior art, gasified coal slime treatment has problems such as high residual carbon content, difficult to meet environmental protection requirements, difficult to control the coal slime combustion ratio, large investment and large area. Especially in large-capacity gasification devices, coal slime treatment costs are high and resource utilization efficiency is low.
By directly reusing the black water from the bottom of the settlement tank to the rod mill to participate in the pulping cycle, combining the filtrate tank to recover the pressure filtrate as slurry and water replenishment, and using a hyperbolic buffer tank anti-blocking design and diverting control system, the flexible circulation of coal slime is achieved, and ultimately maximizing the utilization rate of coal slime residual carbon and minimizing the external discharge of solid waste.
Significantly reduce the processing load and coal slime production of the plate and frame filter press, reduce fresh water consumption, achieve efficient resource utilization and environmental compliance of coal slime, and reduce operating costs.
Smart Images
Figure CN120230593A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of gasified slime treatment, and more particularly to a slime recycling treatment device and method. Background Art
[0002] Currently, the black water after flashing in the pressurized gasifier is sent to a plate and frame filter press or a horizontal screw centrifuge for treatment to produce a filter cake, also called fine slag (slime). The treatment methods of the fine slag include direct external sales. The fine slag has a high residual carbon content and is relatively cheap in terms of external sales price, with low profit. There are also cases where it is blended into the power coal for boiler combustion according to a certain ratio. Since the moisture content of the gasified slime is relatively large (generally between 30% and 60%), before entering the boiler for co-firing, the slime needs to be stacked on a large drying site for natural air drying or separately heated and dried. Open-air drying cannot meet the current environmental protection requirements, but the slime drying requires additional waste heat, which undoubtedly causes great difficulties for co-firing, and the blending ratio of the slime is not easy to control. For gasification devices with relatively large production capacity, the corresponding output of gasified fine slag is also large. It is possible to consider building a new device for refining fine slag into clean coal, but this device has large investment, occupies a lot of land, and has a long investment recovery period. Summary of the Invention
[0003] The purpose of the present invention is to provide a slime recycling treatment device and method. By directly recycling the bottom flow black water of the settling tank to participate in the pulping cycle of the rod mill, the treatment load of the plate and frame filter press and the slime output are significantly reduced; the filtrate tank is used to recover the filter press filtrate as pulping makeup water, greatly reducing the consumption of fresh water; at the same time, through the anti-blocking design and shunt control system of the hyperbolic buffer tank, flexible slime recycling is realized, and finally the utilization rate of slime residual carbon is maximized and the solid waste discharge is minimized, with the comprehensive advantages of efficient resource utilization, reduced operating costs and improved environmental compliance.
[0004] To achieve the above purpose, the present invention provides a slime recycling treatment device, including a gasification mechanism, a sewage treatment mechanism, a pulping mechanism, a settling mechanism, a slime recycling mechanism, a filtrate recycling mechanism and a boiler mechanism. The pulping mechanism is respectively connected to the filtrate recycling mechanism, the gasification mechanism and the settling mechanism. The settling mechanism is respectively connected to the ash water tank, the slime recycling mechanism and the filtrate recycling mechanism. The ash water tank is connected to the sewage treatment mechanism. The sewage treatment mechanism is connected to the gasification mechanism. The slime recycling mechanism is connected to the boiler mechanism.
[0005] Preferably, the pulping mechanism includes a rod mill, a mill discharge tank and a low-pressure coal slurry pump. The outlet of the rod mill is connected to the mill discharge tank. A low-pressure coal slurry pump is connected to the outlet of the mill discharge tank, and the low-pressure coal slurry pump is connected to the gasification mechanism.
[0006] Preferably, the sedimentation mechanism includes a sedimentation tank and an underflow pump. The discharge port of the sedimentation tank is connected to the underflow pump, and the underflow pump is respectively connected to the coal slime circulation mechanism and the rod mill. The sedimentation tank is respectively connected to the gasification mechanism and the ash water tank.
[0007] Preferably, the coal slime circulation mechanism includes a plate and frame filter press, a slag bin, a coal bunker, and a hyperbolic buffer tank. The plate and frame filter press is respectively connected to the underflow pump, the slag bin, and the hyperbolic buffer tank. Among them, the plate and frame filter press is connected to the underflow pump through the black water pipeline to the filter press. The coal bunker is connected to the boiler mechanism through the belt conveyor to the boiler. The hyperbolic buffer tank is connected to the rod mill through the coal slime circulation belt conveyor.
[0008] Preferably, the filtrate circulation mechanism includes a filtrate pump and a filtrate tank. The filtrate tank is respectively connected to the plate and frame filter press and the filtrate pump. The filtrate pump is connected to the rod mill through the filtrate circulation recovery pipeline.
[0009] Preferably, a hyperbolic hopper is installed at the bottom of the hyperbolic buffer tank, and a vibrating motor is installed on the side wall of the hyperbolic hopper.
[0010] The present invention provides a method for treating coal slime circulation, which adopts the above-mentioned coal slime circulation treatment device, and includes the following steps: Step 1: Add raw materials into the rod mill for grinding to obtain coal slurry. The ground coal slurry flows into the mill discharge tank and is then sent to the gasification mechanism through a low-pressure coal slurry pump. Step 2: Black water is produced in the gasification mechanism. The black water enters the sedimentation tank for sedimentation. The water in the upper part of the sedimentation tank overflows into the ash water tank. The ash water in the ash water tank enters the gasification mechanism for circulation and the sewage treatment mechanism for sewage treatment respectively. The black water at the bottom of the sedimentation tank is sent to the plate and frame filter press and the rod mill respectively through the underflow pump. The filtrate produced in the plate and frame filter press flows into the filtrate tank. At the same time, fresh water is added to the filtrate tank. The filtrate pump at the outlet of the filtrate tank pumps the mixed liquid in the filtrate tank into the filtrate circulation recovery pipeline and returns it to the rod mill. Coal and additives are also added to the rod mill at the same time for re-grinding. Step 3: The coal slime produced by the plate and frame filter press is sent to the slag bin and the hyperbolic buffer tank respectively. The bottom of the hyperbolic buffer tank discharges materials and is sent to the coal bunker and the rod mill respectively. The rod mill makes pulp again, and the coal slime in the coal bunker is transported to the boiler mechanism for combustion through the belt conveyor to the boiler.
[0011] Therefore, the present invention adopts the above-mentioned coal slime circulation treatment device and method, and has the following beneficial effects: (1) By directly adding the black water with a high solid content in the sedimentation tank into the rod mill, the recycling of the black water is realized. On the one hand, the residual carbon in the black water can enter the gasification furnace for combustion again with the coal slurry, further reducing the residual carbon content. On the other hand, the amount of black water entering the plate and frame filter press is reduced, thus reducing the load of the plate and frame filter press and the output of coal slime. (2) By setting up a coal bunker and a boiler feed belt conveyor connected to the coal bunker, the recirculation of coal slime is realized, and the coal slime produced by the filter press can be blended into the boiler in a certain proportion; (3) By setting up a relatively large filtrate tank as the feed water tank for the mill, the recirculation of filtrate is realized. On the one hand, there is no need to separately set up a feed water tank for the mill, and on the other hand, digesting the filtrate can reduce the consumption of fresh water and save water resources; (4) A hyperbolic buffer tank is adopted, and the hyperbolic hopper arranged at the bottom can ensure the fluidity of the material, and by using a vibrating motor in cooperation, the blockage of the hyperbolic hopper can be prevented.
[0012] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings
[0013] Figure 1 It is a schematic structural diagram of an embodiment of a coal slime recycling treatment device and method of the present invention; Figure 2 It is a schematic structural diagram of the hyperbolic buffer tank of an embodiment of a coal slime recycling treatment device and method of the present invention.
[0014] Reference Numerals 1. Filtrate circulation recovery pipeline, 2. Slag bin, 3. Coal bunker, 4. Rod mill, 5. Mill discharge tank, 6. Low-pressure coal slurry pump, 7. Settling tank, 8. Ash water tank, 9. Underflow pump, 10. Black water circulation recovery pipeline, 11. Black water pipeline to filter press, 12. Hyperbolic buffer tank, 13. Boiler feed belt conveyor, 14. Plate and frame filter press; 15. Filtrate tank, 16. Filtrate pump, 17. Coal slime circulation belt conveyor; 18. Hyperbolic hopper, 19. Vibrating motor; 20. Gasification mechanism; 21. Sewage treatment mechanism; 22. Boiler mechanism. Detailed Embodiments
[0015] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.
[0016] Unless otherwise defined, the technical terms or scientific terms used in this invention shall have the ordinary meanings as understood by those with ordinary skills in the field to which this invention pertains. The "first", "second" and similar terms used in this invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.
[0017] Embodiment 1 As Figure 1 shown, the present invention provides a coal slime recycling treatment device, which includes a gasification mechanism 20, a sewage treatment mechanism 21, a pulp preparation mechanism, a sedimentation mechanism, a coal slime recycling mechanism, a filtrate recycling mechanism and a boiler mechanism 22. The pulp preparation mechanism is respectively connected to the filtrate recycling mechanism, the gasification mechanism 20 and the sedimentation mechanism. The pulp preparation mechanism is used to mix and grind coal, coal slime, filtrate and additives to prepare coal slurry. The sedimentation mechanism is used to separate solid particles from liquid in the black water. The gasification mechanism 20 is used to provide a gasification site to achieve efficient energy conversion of the coal slurry and produce black water. The filtrate recycling mechanism is used to recover the filtrate generated by pressure filtration. The sedimentation mechanism is respectively connected to an ash water tank 8, the coal slime recycling mechanism and the filtrate recycling mechanism. The coal slime recycling mechanism is used to realize multi-path reuse of coal slime and reduce the discharge of solid waste. The ash water tank 8 is connected to the sewage treatment mechanism 21. The ash water tank 8 is used to temporarily store ash water. The sewage treatment mechanism 21 is used to treat the ash water that cannot be recycled to ensure that the water quality discharged from the system meets the standards. The sewage treatment mechanism 21 is connected to the gasification mechanism 20. The coal slime recycling mechanism is connected to the boiler mechanism 22. The boiler mechanism 22 is used to burn coal slime, recover energy and reduce the amount of solid waste. Among them, the gasification mechanism 20, the sewage treatment mechanism 21 and the boiler mechanism 22 are all arranged using existing structures. For example, the boiler mechanism 22 uses existing boiler and other structures to co-fire coal slime.
[0018] The pulp preparation mechanism includes a rod mill 4, a mill discharge tank 5 and a low-pressure coal slurry pump 6. The outlet of the rod mill 4 is connected to the mill discharge tank 5. A low-pressure coal slurry pump 6 is connected to the outlet of the mill discharge tank 5. The low-pressure coal slurry pump 6 is connected to the gasification mechanism 20. The rod mill 4 is used to mix and grind coal, additives, recycled black water and filtrate to prepare coal slurry. The mill discharge tank 5 is used to store coal slurry. The low-pressure coal slurry pump 6 is used to transport the coal slurry into the gasification mechanism 20.
[0019] The sedimentation mechanism includes a sedimentation tank 7 and an underflow pump 9. The discharge port of the sedimentation tank 7 is connected to the underflow pump 9. The underflow pump 9 is respectively connected to the coal slime circulation mechanism and the rod mill 4. The sedimentation tank 7 is respectively connected to the gasification mechanism 20 and the ash water tank 8. The sedimentation tank 7 is used to separate the solid particles and liquid in the black water. The underflow pump 9 is used to divide the high-concentration black water in the sedimentation tank 7 into two paths. One path returns to the rod mill 4 through the black water circulation recovery pipeline 10, and the other path enters the plate and frame filter press 14 through the black water pipeline to the filter press 11.
[0020] The coal slime circulation mechanism includes a plate and frame filter press 14, a slag bin 2, a coal bunker 3 and a hyperbolic buffer tank 12. The plate and frame filter press 14 is respectively connected to the underflow pump 9, the slag bin 2 and the hyperbolic buffer tank 12. Among them, the plate and frame filter press 14 is connected to the underflow pump 9 through the black water pipeline to the filter press 11. The plate and frame filter press 14 is used for high-pressure dehydration of high-concentration black water. The coal bunker 3 is connected to the boiler mechanism 22 through the boiler belt conveyor 13. The coal bunker 3 is used to store high-calorific coal slime and is transported to the boiler mechanism 22 through the boiler belt conveyor 13 for combustion to achieve energy recovery.
[0021] The slag bin 2 is used to store the coal slime that cannot be recycled and serves as the final disposal unit. The hyperbolic buffer tank 12 is connected to the rod mill 4 through the coal slime circulation belt conveyor 17. The hyperbolic buffer tank 12 is used to ensure the fluidity of the coal slime. As Figure 2 shown, a hyperbolic hopper 18 is installed at the bottom of the hyperbolic buffer tank 12, and a vibrating motor 19 is installed on the side wall of the hyperbolic hopper 18. The vibrating motor 19 is used to make the coal slime flow smoothly and prevent blockage.
[0022] The filtrate circulation mechanism includes a filtrate pump 16 and a filtrate tank 15. The filtrate tank 15 is respectively connected to the plate and frame filter press 14 and the filtrate pump 16. The filtrate pump 16 is connected to the rod mill 4 through the filtrate circulation recovery pipeline 1. The filtrate tank 15 is used to collect the filtrate generated by the plate and frame filter press 14. The filtrate pump 16 is used to transport the mixed liquid of the filtrate and fresh water in the filtrate tank 15 to the rod mill 4.
[0023] The present invention provides a method for circulating and treating coal slime. Using the above-mentioned coal slime circulation treatment device, it includes the following steps: Step 1: Add raw materials to the rod mill 4 for grinding to obtain coal slurry. According to the concentration of the coal slurry discharged from the rod mill 4, adjust the water volume and coal volume entering the rod mill 4. The ground coal slurry flows into the mill discharge tank 5 and then is sent to the gasification mechanism 20 through the low-pressure coal slurry pump 6; Step 2: The black water is produced in the gasification mechanism 20. The black water enters the sedimentation tank 7 for sedimentation. It is necessary to ensure that the amount of black water sent to the rod mill 4 through the underflow pump 9 is as large as possible, so that the black water can be directly recycled back to the pulp-making mechanism, which can reduce the amount of black water sent to the plate and frame filter press 14, thereby reducing the amount of filtrate and coal slime produced by the plate and frame filter press 14; The water in the upper and middle parts of the settling tank 7 overflows into the ash water tank 8. The ash water in the ash water tank 8 enters the gasification mechanism 20 for circulation and the sewage treatment mechanism 21 for sewage treatment respectively. The black water at the bottom of the settling tank 7 is sent to the plate and frame filter press 14 and the rod mill 4 respectively by the underflow pump 9. Because part of the black water is sent to the rod mill 4 and the combustible content in the boiler slag is low, the amount of coal produced by the plate and frame filter press 14 needs to ensure the amount sent to the boiler. When the amount of coal slime co-fired in the boiler reaches the maximum, the coal slime is sent to the rod mill 4 for pulping; The filtrate produced in the plate and frame filter press 14 flows into the filtrate tank 15. At the same time, fresh water is added to the filtrate tank 15. The filtrate pump 16 at the outlet of the filtrate tank 15 pumps the mixed liquid in the filtrate tank 15 into the filtrate circulation recovery pipeline 1 and returns it to the rod mill 4. Coal and additives are also added to the rod mill 4 at the same time for re-grinding; Step 3: The coal slime produced by the plate and frame filter press 14 is sent to the slag yard 2 and the hyperbolic buffer tank 12 respectively. The bottom of the hyperbolic buffer tank 12 discharges materials and is sent to the coal bunker 3 and the rod mill 4 respectively. The rod mill 4 conducts pulping again. The coal slime in the coal bunker 3 is transported to the boiler mechanism 22 for combustion through the boiler belt conveyor 13. When the coal slime amounts in the rod mill 4 and the boiler both reach the maximum, the coal slime is sent to the slag yard 2, and the amount of coal slime entering the slag yard 2 is minimized as much as possible to realize the recycling of coal slime, minimize the external sales volume to the greatest extent, and finally make the coal slime become the gasification coarse slag and boiler fine slag with low combustible content.
[0024] Therefore, the present invention adopts the above-mentioned coal slime circulation treatment device and method. By directly recycling the underflow black water at the bottom of the settling tank to the rod mill to participate in the pulping cycle, the treatment load of the plate and frame filter press and the coal slime output are significantly reduced; the filtrate is recycled by the filtrate tank as the pulping make-up water, greatly reducing the fresh water consumption; at the same time, through the anti-blocking design and shunt control system of the hyperbolic buffer tank, the flexible circulation of coal slime is realized, and finally the utilization rate of coal slime residual carbon is maximized and the solid waste discharge is minimized, with the comprehensive advantages of efficient resource utilization, reduced operation cost and improved environmental compliance.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A slime recycling treatment device, characterized in that: It includes a gasification mechanism, a sewage treatment mechanism, a pulping mechanism, a sedimentation mechanism, a slime circulation mechanism, a filtrate circulation mechanism and a boiler mechanism. Among them, the pulping mechanism is respectively connected to the filtrate circulation mechanism, the gasification mechanism and the sedimentation mechanism. The sedimentation mechanism is respectively connected to an ash water tank, the slime circulation mechanism and the filtrate circulation mechanism. The ash water tank is connected to the sewage treatment mechanism. The sewage treatment mechanism is connected to the gasification mechanism. The slime circulation mechanism is connected to the boiler mechanism.
2. The coal slime recycling treatment device according to claim 1, characterized in that: The pulping mechanism includes a rod mill, a mill discharge tank and a low-pressure coal slurry pump. Among them, the outlet of the rod mill is connected to the mill discharge tank. A low-pressure coal slurry pump is connected at the outlet of the mill discharge tank. The low-pressure coal slurry pump is connected to the gasification mechanism.
3. The coal slime recycling treatment device according to claim 2, characterized in that: The sedimentation mechanism includes a sedimentation tank and a bottom flow pump. The outlet of the sedimentation tank is connected to the bottom flow pump. The bottom flow pump is respectively connected to the slime circulation mechanism and the rod mill. The sedimentation tank is respectively connected to the gasification mechanism and the ash water tank.
4. A slime recycling treatment device according to claim 2, characterized in that: The slime circulation mechanism includes a plate and frame filter press, a slag bin, a coal bunker and a hyperbolic buffer tank. The plate and frame filter press is respectively connected to the bottom flow pump, the slag bin and the hyperbolic buffer tank. Among them, the plate and frame filter press is connected to the bottom flow pump through a black water pipeline to the filter press. The coal bunker is connected to the boiler mechanism through a belt conveyor to the boiler. The hyperbolic buffer tank is connected to the rod mill through a slime circulation belt conveyor.
5. The coal slime recycling treatment device according to claim 4, characterized in that: The filtrate circulation mechanism includes a filtrate pump and a filtrate tank. The filtrate tank is respectively connected to the plate and frame filter press and the filtrate pump. The filtrate pump pumps the mixed liquid in the filtrate tank into the filtrate circulation recovery pipeline through the filtrate circulation recovery pipeline and returns it to the rod mill.
6. The coal slime recycling treatment device according to claim 4, characterized in that: A hyperbolic hopper is installed at the bottom of the hyperbolic buffer tank. A vibrator motor is installed on the side wall of the hyperbolic hopper.
7. A method for recycling and treating slime, characterized in that: Using a slime circulation treatment device according to any one of claims 1-6, it includes the following steps: Step 1: Add raw materials into the rod mill for grinding to obtain coal slurry. The ground coal slurry flows into the mill discharge tank and is then sent to the gasification mechanism through a low-pressure coal slurry pump. Step 2: Black water is produced in the gasification mechanism. The black water enters the sedimentation tank for sedimentation. The water in the upper part of the sedimentation tank overflows into the ash water tank. The ash water in the ash water tank enters the gasification mechanism for circulation and the sewage treatment mechanism for sewage treatment respectively. The black water at the bottom of the sedimentation tank is sent to the plate and frame filter press and the rod mill respectively through the bottom flow pump. The filtrate produced in the plate and frame filter press flows into the filtrate tank. At the same time, fresh water is added to the filtrate tank. The filtrate pump at the outlet of the filtrate tank pumps the mixed liquid in the filtrate tank into the filtrate circulation recovery pipeline and returns it to the rod mill. Coal and additives are also added to the rod mill at the same time for re-grinding. Step 3: The slime produced by the plate and frame filter press is sent to the slag bin and the hyperbolic buffer tank respectively. The bottom of the hyperbolic buffer tank discharges materials and is sent to the coal bunker and the rod mill respectively. The rod mill makes pulp again. The slime in the coal bunker is transported to the boiler mechanism for combustion through a belt conveyor to the boiler.