Gasification coarse slag sorting and upgrading system
By designing a gasified coarse slag sorting and quality improvement system with multi-stage sorting and desilting process, the problem of high-efficiency desilting materials in the existing technology is solved, and efficient sorting and maximum recovery of gasified coarse slag is achieved, and economic benefits and resource utilization are improved.
Patent Information
- Application Number
- CN202420822187.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-19
AI Technical Summary
The existing gasified ash slag sorting process has low selection accuracy, especially for efficient desilting of materials below 0.1mm, which leads to waste of resources and low economic benefits.
A gasified coarse slag sorting and quality improvement system is designed, combining a concentration cyclone, a fluidized bed sorter, a high-frequency screen, a sequential cyclone, a spiral sorter, a stacked fine screen and a concentration tank. Through the multi-stage sorting and desilting process, the advantages of each equipment are fully utilized to achieve efficient sorting and maximum recovery.
It realizes efficient sorting of gasified crude slag, maximizes the extraction of fixed carbon, improves economic benefits, reduces resource waste, and has a simple system structure, easy operation, and low investment and production costs.
Smart Images
Figure CN222606662U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of comprehensive utilization of gasification ash slag, in particular to a gasification coarse slag sorting and quality-improving system. Background Art
[0002] As we all know, most of the existing gasification ash is directly landfilled, and a small part can be simply sorted by spiral separator. The fixed carbon content of gasification ash, especially the coarse gasification ash, ranges from 30-70%. The conventional spiral separation process has a wide separation particle size but low precision; the fluidized bed separator has a high separation precision and is simple to operate, but the separation particle size is narrow; at the same time, whether it is a spiral or fluidized bed separator, it plays an enrichment role for materials below 0.1mm; and most of the materials below 0.1mm in gasification ash are high-ash materials with an ash content of more than 80%, and their economic value and sorting value are very low. Therefore, in the sorting process, in addition to effective sorting, it is still necessary to strengthen the efficient desludging process to make the gasification ash be efficiently and maximized. If the fixed carbon in the gasification ash can be extracted with high efficiency, low energy consumption, and maximum recovery, it will not only increase economic benefits and reduce resource waste, but also comply with green environmental protection and be on the road of sustainable energy development. Summary of the invention
[0003] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a gasification coarse slag sorting and quality improvement system with low investment cost, low production cost, simple structure, easy operation and maximum benefit of gasification coarse slag sorting effect.
[0004] The technical solution adopted by the utility model to solve its technical problems is:
[0005] A gasification coarse slag sorting and upgrading system, characterized in that the system comprises a concentrating cyclone, a fluidized bed separator, a first high-frequency screen, a classifying cyclone, a spiral separator, a second high-frequency screen, a laminated fine screen, and a concentrating tank, wherein the overflow of the concentrating cyclone is connected to the inlet of the concentrating tank, the bottom flow of the concentrating cyclone is connected to the inlet of the fluidized bed separator, the concentrate outlet of the fluidized bed separator is connected to the inlet of the classifying cyclone, the tailings outlet of the fluidized bed separator is connected to the inlet of the first high-frequency screen, and the overflow outlet of the classifying cyclone is connected to the inlet of the concentrating tank The underflow outlet of the grading cyclone is connected to the inlet of the spiral separator, the concentrate outlet of the spiral separator is connected to the inlet of the laminated fine screen, the tailings outlet of the spiral separator is connected to the inlet of the second high-frequency screen, the on-screen product outlet of the laminated fine screen is a clean coal product, the under-screen product outlet of the laminated fine screen, the under-screen product outlet of the first high-frequency screen, and the under-screen product outlet of the second high-frequency screen are respectively connected to the concentrator, and the products of the on-screen product outlet of the first high-frequency screen, the on-screen product outlet of the second high-frequency screen, and the tailings product outlet of the concentrator are all tailings products.
[0006] The inlet of the concentrating cyclone described in the utility model is connected with a feeding mechanism, and the feeding mechanism comprises a stirring barrel, a first slurry pump, a coarse screen, a slurry mixing barrel, and a second slurry pump. The discharge port of the stirring barrel is connected with the feed port of the coarse screen through the first slurry pump, the upper screen outlet of the coarse screen is a tailings product, the lower screen product outlet of the coarse screen is connected with the inlet of the slurry mixing barrel, and the outlet of the slurry mixing barrel is connected with the feed port of the concentrating cyclone through the second slurry pump.
[0007] The concentrate outlet of the fluidized bed separator of the utility model is connected with the inlet of the classification cyclone through a spiral feeding barrel and a third slurry pump.
[0008] The undersize product outlet of the laminated fine screen, the undersize product outlet of the first high-frequency screen and the undersize product outlet of the second high-frequency screen of the utility model are respectively connected to the inlet of the concentration tank through the tailings bucket and the fourth slurry pump.
[0009] The tailings product outlet of the concentration tank of the utility model is connected to the feed port of the filter press through the fifth slurry pump, the filter cake outlet of the filter press is the tailings product, and the filtrate outlet of the filter press is connected to the inlet of the concentration tank.
[0010] The overflow outlet of the concentration tank of the utility model is connected to the circulating water tank, and the outlet of the circulating water tank is respectively connected to the water supply ports of the stirring barrel, the coarse screen, the fluidized bed separator, the spiral separator and the laminated fine screen.
[0011] The screen product outlet of the laminated fine screen of the utility model is connected with the centrifuge inlet, and the centrifuge dehydrates the concentrate product.
[0012] The beneficial effects of the utility model are as follows: the above scheme is adopted, aiming at the characteristics of gasification ash: the ash content of materials with a particle size of ≥1mm and less than 0.1mm is high and has no wash value, and the fixed carbon content of materials with a particle size of 1-0.1mm is high and has certain selectivity. The system makes full use of the different advantages of different fine-grained material sorting equipment, namely, the thickening and cutting coarse screen controls the feed particle size; the thickening cyclone controls the feed concentration entering the fluidized bed separator; the TBS has high precision and discharges most of the high-ash and high-specific gravity materials as much as possible; the grading cyclone discharges part of the 0.1mm particle size fine mud materials; the spiral separator takes advantage of its large sorting particle size range to achieve the selection of 0.1-1mm materials; the laminated fine screen further strengthens the removal of high-ash fine mud in the concentrate; the concentration system controls the circulating water quality to ensure the good operation of the system. The use of different classification and sorting combinations to give full play to their respective advantages and characteristics can maximize the benefits of gasification coarse slag sorting. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with the accompanying drawings:
[0015] As shown in the accompanying drawings, a gasification coarse slag sorting and upgrading system is characterized in that the system includes a concentrating cyclone 6, a fluidized bed separator 7, a first high-frequency screen 8, a grading cyclone 11, a spiral separator 12, a second high-frequency screen 13, a laminated fine screen 14, and a concentrating tank 18. The overflow of the concentrating cyclone 6 is connected to the inlet of the concentrating tank 18, the bottom flow of the concentrating cyclone 6 is connected to the inlet of the fluidized bed separator 7, the concentrate outlet of the fluidized bed separator 7 is connected to the inlet of the grading cyclone 11, the tailings outlet of the fluidized bed separator 7 is connected to the inlet of the first high-frequency screen 8, and the overflow outlet of the grading cyclone 11 is connected to the inlet of the concentrating tank 18. The bottom flow outlet of the grading cyclone 11 is connected to the inlet of the spiral separator 12, the concentrate outlet of the spiral separator 12 is connected to the inlet of the laminated fine screen 14, the tailings outlet of the spiral separator 12 is connected to the inlet of the second high-frequency screen 13, the overscreen product outlet of the laminated fine screen 14 is a clean coal product, the underscreen product outlet of the laminated fine screen 14, the underscreen product outlet of the first high-frequency screen 8, and the underscreen product outlet of the second high-frequency screen 13 are respectively connected to the concentrating tank 18, and the products of the overscreen product outlet of the first high-frequency screen 8, the overscreen product outlet of the second high-frequency screen 13, and the tailings product outlet of the concentrating tank 18 are all tailings products.
[0016] Furthermore, the inlet of the thickening cyclone 6 is connected to a feeding mechanism, which includes a stirring barrel 1, a first slurry pump 2, a coarse screen 3, a slurry mixing barrel 4, and a second slurry pump 5. The discharge port of the stirring barrel 1 is connected to the feed port of the coarse screen 3 via the first slurry pump 2. The above-screen outlet of the coarse screen 3 is a tailings product, and the below-screen product outlet of the coarse screen 3 is connected to the inlet of the slurry mixing barrel 4. The outlet of the slurry mixing barrel 4 is connected to the feed port of the thickening cyclone 6 via the second slurry pump 5.
[0017] Furthermore, the concentrate outlet of the fluidized bed separator 7 is connected to the inlet of the classifying cyclone 11 via the spiral feed barrel 9 and the third slurry pump 10 .
[0018] Furthermore, the undersize product outlet of the laminated fine screen 14 , the undersize product outlet of the first high-frequency screen 8 , and the undersize product outlet of the second high-frequency screen 13 are connected to the inlet of the concentration tank 18 via the tailings barrel 16 and the fourth slurry pump 17 , respectively.
[0019] Furthermore, the tailings product outlet of the thickening tank 18 is connected to the feed port of the filter press 20 via the fifth slurry pump 19 , the filter cake outlet of the filter press 20 is the tailings product, and the filtrate outlet of the filter press 20 is connected to the inlet of the thickening tank 18 .
[0020] Furthermore, the overflow outlet of the concentration tank 18 is connected to the circulating water tank 21, and the outlet of the circulating water tank 21 is respectively connected to the water supply ports of the mixing barrel 1, the coarse screen 3, the fluidized bed separator 7, the spiral separator 12, and the laminated fine screen 14.
[0021] Furthermore, the outlet of the product on the screen of the laminated fine screen 14 is connected to the inlet of the centrifuge 15, and the centrifuge 15 dehydrates the concentrate product.
[0022] Example:
[0023] A gasification coarse slag sorting and upgrading system, wherein the mixing barrel 1 is connected to the inlet of the first slurry pump 2 through a pipeline; the discharge port of the first slurry pump 2 is connected to the feed distributor in the coarse screen 3 through a pipeline; the under-screen of the coarse screen 3 flows to the slurry mixing barrel 4 through a pipeline, and the tailings product on the screen of the coarse screen 3 is transferred to the ground; the slurry mixing barrel 4 is connected to the inlet of the second slurry pump 5 through a pipeline; the outlet of the second slurry pump 5 is connected to the distributor of the concentrating cyclone 6 through a pipeline; the overflow of the concentrating cyclone 6 flows to the feed well of the concentrating tank 18 through a pipeline, and the bottom flow of the concentrating cyclone 6 is connected to the feed well of the fluidized bed separator 7 through a pipeline; the fluidized bed separator The overflow of the separator 7 flows by gravity to the spiral feed barrel 9 through a pipeline, and the bottom flow of the fluidized bed separator 7 is connected to the feed distributor of the first high-frequency screen 8 through a pipeline; the tailings product on the first high-frequency screen 8 flows out, and the slurry under the screen flows by gravity to the tailings barrel 16 through a pipeline; the spiral feed barrel 9 is connected to the feed port of the third slurry pump 10 through a pipeline, and the third slurry pump 10 is connected to the grading cyclone 11 through a pipeline; the overflow pipeline of the grading cyclone 11 flows by gravity to the feed well of the thickening tank 18, and the bottom flow of the grading cyclone 11 is connected to the distributor of the spiral separator 12 through a pipeline; the tailings of the spiral separator 12 are connected to the separator of the second high-frequency screen 13 through a pipeline. The concentrate outlet of the spiral separator 12 is connected to the distributor of the laminated fine screen 14 through a pipeline; the tailings product is discharged from the screen of the second high-frequency screen 13, and the slurry under the screen flows to the tailings bucket 16 through a pipeline; the underscreen material of the laminated fine screen 14 flows to the tailings bucket 16 through a pipeline, and the overscreen material of the laminated fine screen 14 flows to the feed port of the centrifuge 15 through a pipeline; the discharge of the centrifuge 15 is transported to the concentrate site as a concentrate product, and the centrifuge liquid of the centrifuge 15 returns to the spiral feed barrel 9; the tailings bucket 16 is connected to the feed port of the fourth slurry pump 17 through a pipeline, and the discharge port of the fourth slurry pump 17 is connected to the feed well of the concentration tank 18 The overflow of the thickening tank 18 flows by gravity to the circulating water tank 21 through a pipeline, the bottom flow of the thickening tank 18 is connected to the inlet of the fifth slurry pump 19 through a pipeline, and the discharge port of the fifth slurry pump 19 is connected to the inlet of the filter press 20 through a pipeline; the filtrate of the filter press 20 returns to the thickening tank 18 through a pipeline, and the discharge of the filter press 20 is transported to the tailings site as tailings; the circulating water tank 21 is connected to the inlet of the circulating water pump 22 through a pipeline, and the circulating water pump 22 meets the production water of the entire site through a pipeline, and the outlet of the circulating water tank 21 is respectively connected to the water replenishment ports of the mixing barrel 1, the coarse screen 3, the fluidized bed separator 7, the spiral separator 12, and the laminated fine screen 14.
[0024] The sorting process of the patented system is as follows: the gasified coarse slag enters the mixing barrel 1, and the slurry concentration is adjusted by adding water, and then it is fed to the coarse screen 3 through the first slurry pump 2 for 1mm coarse cutting. The screen is provided with spray water for enhanced classification. Most of the materials on the coarse screen 3 with a size of >1mm have high ash content, ranging from 70-98%, with poor selectivity and low fixed carbon content, and are therefore discharged as tailings; the under-screen materials enter the slurry mixing barrel 4 for re-slurry mixing, adjusted to 80-120g / l, and then fed to the concentrating cyclone 6 through the second slurry pump 5 for graded concentration operations. The concentrating cyclone 6 mainly controls the feed concentration of the fluidized bed separator 7 and discharges part of the high-ash fine mud (materials below 0.1mm) in advance; the overflow of the concentrating cyclone 6 enters the concentrating tank 20, and the bottom flow of the concentrating cyclone 6 flows by gravity to the feed well of the fluidized bed separator 7; the fluidized bed separator 7 is Because of its high sorting accuracy, most of the high-ash and high-density materials can be excluded from entering the underflow product, and then dehydrated by the first high-frequency screen 8 to be transferred to the tailings site as tailings products; at the same time, since the fluidized bed separator 7 has a narrow sorting particle size (0.25-1mm), most of the fine-grained materials and coarse concentrates enter the overflow product of the fluidized bed separator 7, and the overflow product is fed into the spiral feed barrel 9, and fed into the grading cyclone 11 through the third slurry pump 10 for grading operation. The main function of the grading cyclone is to discharge the high-ash fine-grained products (below 0.1mm) enriched in the TBS overflow product from the sorting system in advance, and optimize the sorting conditions of the downstream spiral separator 12; the overflow of the grading cyclone 11 flows by gravity to the concentration tank 18, and the underflow materials of the grading cyclone 11 flow by gravity into the distributor of the spiral separator 12 for secondary selection. Since the spiral separator 12 has a wide particle size range (1-0.1mm), and the 1-0.1mm material in the gasified coarse slag has a strong selectivity, the spiral separator 12 is used for secondary sorting. During the sorting process of the spiral separator 12, high-ash and high-density products move to the inner circle due to their own specific gravity and slow flow rate, forming tailings products, which are transferred to the tailings site after being dehydrated by the second high-frequency screen 13; the concentrate and fine-grained materials gradually move to the outer circle due to their light weight, and finally become spiral concentrate products and flow to the laminated fine screen 14 distributor; since there are also a large number of high-ash fine-grained materials in the spiral concentrate, efficient fine-grained grading equipment is required for enhanced grading to ensure the quality of the concentrate product. Therefore, the laminated fine screen 14 (whose grading efficiency can reach more than 85%) with the best effect in the field of efficient and fine grading is used for efficient grading.The concentrate on the laminated fine screen 14 enters the centrifuge 15 for dehydration, and the dehydrated concentrate can be sold or used as high-quality concentrate after drying or drying; the materials under the first high-frequency screen 8, the second high-frequency screen 13, and the laminated fine screen 14 are all fine-grained high-ash products, and because the general vibrating screen is arranged at a low height, it is difficult to flow to the concentration tank by gravity. Therefore, it can flow to the tailings barrel 16 by gravity, and be pumped into the concentration tank 18 by the fourth slurry pump 17 for concentration. After sedimentation in the concentration tank 18, its overflow enters the circulating water tank 21 as circulating water, and then is supplied to the whole plant through the circulating water pump 22. The bottom flow of the sedimentation tank 18 is pumped into the filter press 20 by the fifth slurry pump 19 for filtration. The product of the filter press 20 is transferred to the tailings site as tailings, and the filtrate of the filter press 20 continues to return to the concentration tank for concentration.
[0025] In the above process, the main function of the coarse screen 3 is to screen out materials larger than 1 mm in advance. From the material property table 1, it can be seen that the ash content of materials larger than 1 mm is more than 70%, and the hardness is relatively large, the selectivity is very poor, and it is not suitable for entering the sorting system for sorting. Therefore, it needs to be screened out in advance;
[0026] Table 1 below shows the small screening data of gasification coarse slag:
[0027]
[0028] In the above process, the main function of the concentrating cyclone 6 is to control the feed concentration of the fluidized bed separator. The optimal feed condition of the fluidized bed separator is 40-60%. The concentrating cyclone also discharges some fine-grained materials. As can be seen from Table 1, the accumulated ash content of materials below 0.1 mm is as high as 86.89% or more, and the selectivity is poor, so they need to be discharged in advance.
[0029] In the above process, the fluidized bed separator 7 is used as the primary separation equipment, and the spiral separator 12 is used as the secondary separation equipment;
[0030] In the above-mentioned process, the main function of the grading cyclone 11 and the laminated fine screen 14 is to discharge the fine-grained materials in the concentrate. Due to the sorting principle of the fluidized bed separator 7 and the spiral separator 12, during the sorting process, in addition to the materials with lighter specific gravity entering the concentrate, most of the materials below the lower limit of sorting will be carried into the concentrate product with the water flow, which will have an enrichment effect on the fine-grained materials below the lower limit of the sorting machine. At the same time, after the separator removes most of the high-specific gravity and high-ash materials, the proportion of fine-grained materials in the overflow product will increase. Therefore, desludging needs to be strengthened.
[0031] In the above process, the overflow of the concentrating cyclone 6, the overflow of the grading cyclone 11, the under-screen of the first high-frequency screen 8, the under-screen of the second high-frequency screen 13, the under-screen of the laminated fine screen 14, and the filtrate of the filter press are fed into the concentrating tank for concentration. Due to the above structure, the utility model has the advantages of low investment cost, low production cost, simple structure, easy operation, and maximum benefit of gasification coarse slag sorting effect.
Claims
1. A gasification coarse slag sorting and upgrading system, characterized in that The system comprises a concentrating cyclone, a fluidized bed separator, a first high-frequency screen, a grading cyclone, a spiral separator, a second high-frequency screen, a laminated fine screen and a concentrating tank. The overflow of the concentrating cyclone is connected to the inlet of the concentrating tank, the underflow of the concentrating cyclone is connected to the inlet of the fluidized bed separator, the concentrate outlet of the fluidized bed separator is connected to the inlet of the grading cyclone, the tailings outlet of the fluidized bed separator is connected to the inlet of the first high-frequency screen, the overflow outlet of the grading cyclone is connected to the inlet of the concentrating tank, the underflow outlet of the grading cyclone is connected to the inlet of the spiral separator, the concentrate outlet of the spiral separator is connected to the inlet of the laminated fine screen, the tailings outlet of the spiral separator is connected to the inlet of the second high-frequency screen, the overscreen product outlet of the laminated fine screen is a clean coal product, the underscreen product outlet of the laminated fine screen, the underscreen product outlet of the first high-frequency screen and the underscreen product outlet of the second high-frequency screen are respectively connected to the concentrating tank, and the overscreen product outlet of the first high-frequency screen, the overscreen product outlet of the second high-frequency screen and the tailings product outlet of the concentrating tank are all tailings products.
2. A gasification coarse slag separation and upgrading system according to claim 1, characterized in that The inlet of the thickening cyclone is connected to the feeding mechanism, which includes a stirring barrel, a first slurry pump, a coarse screen, a slurry mixing barrel, and a second slurry pump. The discharge port of the stirring barrel is connected to the feed port of the coarse screen through the first slurry pump, the upper screen outlet of the coarse screen is the tailings product, the lower screen product outlet of the coarse screen is connected to the inlet of the slurry mixing barrel, and the outlet of the slurry mixing barrel is connected to the feed port of the thickening cyclone through the second slurry pump.
3. The system for separating and upgrading gasified coarse slag according to claim 1, characterized in that The concentrate outlet of the fluidized bed separator is connected to the inlet of the classifying cyclone via a spiral feed barrel and a third slurry pump.
4. The system for separating and upgrading gasified coarse slag according to claim 1, characterized in that The undersize product outlet of the laminated fine screen, the undersize product outlet of the first high-frequency screen, and the undersize product outlet of the second high-frequency screen are connected to the inlet of the concentration tank via the tailings bucket and the fourth slurry pump respectively.
5. The system for separating and upgrading gasified coarse slag according to claim 1, characterized in that The tailings product outlet of the concentration tank is connected to the feed port of the filter press through the fifth slurry pump, the filter cake outlet of the filter press is the tailings product, and the filtrate outlet of the filter press is connected to the inlet of the concentration tank.
6. The system for separating and upgrading gasified coarse slag according to claim 1, characterized in that The overflow outlet of the concentration tank is connected to the circulating water tank, and the outlet of the circulating water tank is respectively connected to the water supply ports of the stirring barrel, the coarse screen, the fluidized bed separator, the spiral separator, and the laminated fine screen.
7. The system for separating and upgrading gasified coarse slag according to claim 1, characterized in that The outlet of the product on the screen of the laminated fine screen is connected to the inlet of the centrifuge, and the centrifuge dehydrates the concentrate product.