Gasification furnace waste residue unburned carbon gravity separation system

Abstract

The utility model provides a gasification furnace waste residue unburned carbon gravity separation system, which can realize primary separation, particle size grading, gravity grading and dehydration treatment on waste residue slurry, efficiently and precisely separate unburned carbon in gasification furnace waste residues, and further perform resource utilization. Comprising a slurrying system, the upstream of the slurrying system is communicated with a coal gasifier waste residue storage system, and the slurrying system is used for dispersing coal gasifier waste residues in water to form uniform slurry; the grading system is communicated with the downstream of the pulping system and is used for sequentially carrying out primary separation and particle size grading on the pulp conveyed by the pulping system; the separation system is communicated with the downstream of the grading system, is provided with a multi-stage separation mechanism and is used for receiving the small-particle slurry conveyed by the grading system and carrying out multi-stage gravity grading on the slurry; and the grading dehydration system is communicated with the downstream of the separation system, is provided with a multi-stage dehydration mechanism, and is used for receiving the light particle slurry conveyed by the separation system and dehydrating the light particle slurry.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solid waste resource utilization technical field relates to a kind of gravity separation systems of gasification furnace waste residue unburned carbon. BACKGROUND

[0002] Coal chemical industry with coal gasification as core technology is developing rapidly in China, and the large amount of gasification furnace slag solid waste is currently mainly disposed by landfill and stacking, which poses a great threat to China's ecological environment and has become a pressing problem that needs to be solved urgently in coal chemical base. The waste residue discharged from coal gasification furnace contains unburned residual carbon and inorganic minerals such as silicon, aluminum and iron produced under high temperature reaction, and the unburned residual carbon content in the waste residue produced by Texaco gasification furnace is relatively high, which has the value of resource utilization after separation.

[0003] Chinese patent CN116020846A discloses a method for recycling resources from coal chemical gasification coarse slag, which flows the gasification coarse slag slurry into a ball mill for rolling and screening classification. The material slurry with a particle size smaller than the design requirement is separated into low-carbon ash slag and fine carbon powder in an ultra-high field electromagnetic separator, the low-carbon ash slag is dehydrated in a special dehydration bin to obtain an active admixture for building, and the fine carbon slurry is concentrated in a concentrator to obtain coal for burning. The method can realize low energy consumption and water saving in recycling resources from coal chemical gasification coarse slag. However, it uses electromagnetic magnetic force to separate low-carbon ash slag and fine carbon powder, which mainly relies on the difference in weak magnetism of the materials for separation. For unburned carbon with smaller particle size and weaker magnetism, the separation effect is not ideal. UTILITY MODEL CONTENT

[0004] To improve the separation efficiency and precision of unburned carbon in coal gasification furnace waste residue, the present application provides a gravity separation system for unburned carbon in gasification furnace waste residue, which realizes primary separation, particle size classification, gravity classification and dehydration treatment of waste residue slurry through the multi-stage cooperation of pulping system, classification system, separation system and dehydration system, and separates unburned carbon in gasification furnace waste residue efficiently and accurately for resource utilization.

[0005] The utility model adopts the technical scheme of:

[0006] A gravity separation system for unburned carbon in gasification furnace waste residue, comprising:

[0007] A pulping system, which is connected to the upstream of a storage system of coal gasification furnace waste residue and is used to disperse coal gasification furnace waste residue in water to form uniform slurry;

[0008] A classification system, which is connected downstream of the pulping system and is used to sequentially perform primary separation and particle size classification on the slurry delivered by the pulping system;

[0009] A separation system is connected downstream of the classification system and has a multi-stage separation mechanism for receiving the slurry of small particles from the classification system and performing multi-stage gravity classification.

[0010] A dewatering system is connected downstream of the separation system and has a multi-stage dewatering mechanism for receiving the slurry of light particles from the separation system and performing dewatering treatment.

[0011] Further, the pulp preparation system comprises a pulp preparation tank, a stirrer and a first slurry pump, the pulp preparation tank is connected with the storage system, the stirrer is arranged in the pulp preparation tank for stirring the slurry, and the first slurry pump is connected between the pulp preparation tank and the classification system and used for pumping the slurry in the pulp preparation tank into the classification system.

[0012] Further, the classification system comprises a vibrating screen and a classifier, the vibrating screen is connected with the pulp preparation system and used for primary separation of coarse and fine particles of the slurry, and the classifier is connected downstream of the vibrating screen and used for separating the slurry according to particle size.

[0013] Further, the separation system comprises at least two-stage cyclone systems, a first-stage cyclone system comprises a first slurry tank, a second slurry pump and a first-stage cyclone connected in sequence, the first slurry tank is connected upstream of the classification system, and a second-stage cyclone system comprises a second slurry tank, a third slurry pump and a second-stage cyclone connected in sequence, the second slurry tank is connected upstream of the first-stage cyclone.

[0014] Further, the classification and dewatering system comprises at least two-stage dewatering screens, a first-stage dewatering screen is connected upstream of the separation system, a second-stage dewatering screen is connected downstream of the first-stage dewatering screen, and a centrifugal dewatering machine is connected downstream of the second-stage dewatering screen.

[0015] Further, the storage system adopts a stockyard or a silo, or a combination of the stockyard and the silo.

[0016] Further, the pulp preparation system, the classification system, the separation system and the classification and dewatering system are connected through pipelines, trenches, grooves or conveying machines.

[0017] Further, the conveying machine is a machine with horizontal and / or vertical conveying functions.

[0018] The beneficial effects of the utility model include:

[0019] Through the cooperation of the pulping system, the grading system, the separation system and the grading dehydration system, a complete and efficient separation process is formed. The pulping system makes the coal gasifier waste residue into uniform slurry, laying a foundation for subsequent separation; the grading system first removes large particle impurities through primary separation, and then classifies according to particle size, so that the subsequent separation is more targeted; the multi-stage cyclone system of the separation system utilizes the density difference between the unburned carbon and inorganic minerals to effectively separate the unburned carbon and inorganic minerals; the grading dehydration system dehydrates the light particle slurry containing unburned carbon separated out, and finally separates the unburned carbon in the coal gasifier waste residue, so as to realize resource utilization and turn waste into treasure.

[0020] The vibration screen of the grading system performs primary separation of coarse and fine particles, and the classifier further separates according to particle size, which can accurately remove particles that do not meet the requirements and avoid their interference with the subsequent separation of unburned carbon. The multi-stage cyclone system of the separation system can realize accurate multi-stage gravity classification according to the gravity difference between the unburned carbon and inorganic minerals. In the primary cyclone, based on the gravity difference of the particles, the particles with large and small densities are preliminarily separated to a certain extent, and the secondary cyclone further separates these particles more finely, so that the unburned carbon and inorganic mineral particles are more thoroughly separated according to the gravity difference, thereby improving the purity of the unburned carbon. Through the gradual fine separation of the multi-stage cyclone system, the quality of the product after each stage of separation is more stable, the separation result of the previous stage provides relatively stable feeding conditions for the next stage, and the next stage further optimizes the separation effect on this basis, thereby ensuring that the unburned carbon finally separated has high stability and consistency in quality and purity. The grading dehydration system is provided with at least two dehydration screens. The first dehydration screen preliminarily dehydrates the light particle slurry from the separation system to remove most of the free water and reduce the dehydration burden of the subsequent equipment. Then, the material after preliminary dehydration enters the second dehydration screen, which further removes residual water to further reduce the water content of the material. Compared with a single dehydration screen, this step-by-step dehydration method can more effectively reduce the water content of the material and improve the dehydration efficiency.

[0021] In summary, the present application changes the previous disposal method of mainly filling and stacking the coal gasifier waste residue, and recycles and utilizes it as a resource, effectively reducing the threat of a large amount of coal gasifier residue solid waste to the ecological environment and solving the pain point problem of the coal chemical industry base. The unburned carbon with resource utilization value in the coal gasifier waste residue is efficiently separated out, realizing resource recycling and utilization, turning waste into treasure and improving the utilization rate of resources. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a whole structure schematic diagram of a gravity separation system for unburned carbon of coal gasifier waste residue.

[0023] In the figure: 10 - storage system; 20 - pulping system; 21 - pulping tank; 22 - agitator; 23 - first slurry pump; 30 - classification system; 31 - vibrating screen; 32 - classifier; 40 - separation system; 41 - first slurry tank; 42 - second slurry pump; 43 - primary cyclone; 44 - second slurry tank; 45 - third slurry pump; 46 - secondary cyclone; 50 - dewatering system; 51 - primary dewatering screen; 52 - secondary dewatering screen; 53 - centrifugal dewaterer. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0026] Embodiment 1: A gravity sorting system for unburned carbon in gasifier slag, which sorts unburned carbon and other components by using the density difference and particle size difference of each component in the gasifier slag. Figure 1 , comprising a storage system 10, a pulping system 20, a classification system 30, a separation system 40, and a dewatering system 50 connected in sequence, and each system is connected through pipelines, trenches, grooves or conveying machinery. The conveying machinery refers to machinery with horizontal and / or vertical conveying capacity, preferably belt conveyors, or bucket elevators, or chain bucket machines, or scraper machines.

[0027] The storage system 10 adopts storage in a stockyard or a silo, or mixed storage in a stockyard and a silo, for storing the waste slag discharged from the slag yard or the coal gasifier.

[0028] The pulping system 20 comprises a pulping tank 21, an agitator 22 and a first slurry pump 23. The pulping tank 21 is connected with the storage system 10 and is used to receive the coal gasifier waste slag conveyed from the storage system 10. The agitator 22 is arranged in the pulping tank 21 and is used to stir the slurry to uniformly disperse the waste slag in water. The first slurry pump 23 is connected between the pulping tank 21 and the vibrating screen 31 of the classification system 30, and is used to pump the slurry in the pulping tank 21 into the vibrating screen 31 of the classification system 30.

[0029] The grading system 30 comprises a vibrating screen 31 and a grader 32, wherein the vibrating screen 31 is used for primary separation of coarse and fine particles in the slurry, screening out larger particle impurities, preliminarily purifying the slurry, and laying a foundation for subsequent particle size grading; the grader 32 is connected downstream of the vibrating screen 31 and is used for further separation of the slurry according to particle size, separating particles of different sizes, so as to facilitate subsequent processing and utilization.

[0030] The separation system 40 of the embodiment comprises two-stage cyclone systems. A first-stage cyclone system comprises a first slurry tank 41, a second slurry pump 42, and a first-stage cyclone 43 connected in sequence, and the first slurry tank 41 is connected upstream of the grader 32. A second-stage cyclone system comprises a second slurry tank 44, a third slurry pump 45, and a second-stage cyclone 46 connected in sequence, and the second slurry tank 44 is connected upstream of the first-stage cyclone 43. The first slurry tank 41 receives the slurry separated by the grader 32, and the second slurry pump 42 pumps the slurry in the first slurry tank 41 into the first-stage cyclone 43. The first-stage cyclone 43 uses centrifugal force to perform gravity grading on the slurry, and separates out heavier particles. The slurry processed by the first-stage cyclone system flows into the second-stage cyclone system, and the second slurry tank 44 receives the slurry separated by the first-stage cyclone 43. The third slurry pump 45 pumps the slurry in the second slurry tank 44 into the second-stage cyclone 46. The second-stage cyclone 46 further uses centrifugal force to perform gravity grading on the slurry, and separates out lighter particles.

[0031] Gravity grading is performed because there is a significant difference in density between the unburned carbon and inorganic minerals (the density of the unburned carbon is less than that of the inorganic minerals). By gravity grading, the unburned carbon and inorganic minerals can be effectively separated by using the difference in density, laying a foundation for subsequent resource utilization.

[0032] The grading and dewatering system 50 of the embodiment comprises two-stage dewatering screens. A first-stage dewatering screen 51 is connected upstream of the second-stage cyclone 46, a second-stage dewatering screen 52 is connected downstream of the first-stage dewatering screen 51, and a centrifugal dewatering machine 53 is connected downstream of the second-stage dewatering screen 52. The dewatering system 50 is used to receive the light particle slurry delivered by the separation system 40 and perform dewatering treatment thereon. The first-stage dewatering screen 51 performs preliminary dewatering treatment on the slurry, removes part of the water, and reduces the water content of the slurry, preparing for further dewatering. The slurry processed by the first-stage dewatering screen 51 flows into the second-stage dewatering screen 52, which further performs dewatering treatment on the slurry, further reducing the water content of the slurry, and making the slurry drier. Finally, the slurry processed by the second-stage dewatering screen 52 enters the centrifugal dewatering machine 53, which performs final dewatering treatment on the slurry using centrifugal force, completely removes the water in the slurry, and obtains dry light particle unburned carbon.

[0033] Based on the above structure, the combination of the pulping tank, the agitator and the first slurry pump in the pulping system can effectively make the waste residue into uniform slurry; the combination of the vibrating screen and the classifier in the classification system realizes effective classification of the slurry; the at least two-stage cyclone system adopted in the separation system enhances the gravity classification effect; and the two-stage dehydration screen and the centrifugal dehydrator adopted in the classification and dehydration system ensure the quality of the dehydration treatment. The optimized combination of the equipment in each system improves the stability and reliability of the whole system.

[0034] The overall working process of the waste residue unburned carbon gravity separation system of the gasification furnace according to the embodiment 1 is as follows:

[0035] The waste residue discharged from the slag yard or the coal gasification furnace is sent into the raw material storage system 10 by the transport vehicle, and then the waste residue is sent into the pulping system 20 by the conveying machinery, and first enters the pulping tank 21, and then the waste residue is uniformly dispersed in water under the action of the agitator 22, and then the waste residue slurry is sent to the classification system 30 by the first slurry pump 23. In the classification system 30, the slurry is subjected to primary separation in the vibrating screen 31, and the larger particle impurities in the slurry are separated out, and the slurry under the screen continues to enter the classifier 32 for particle size classification. The smaller particle slurry classified out is sent to the separation system 40 for gravity classification, and the slurry sequentially passes through the first slurry tank 41, the second slurry pump 42, the first cyclone 43, the second slurry tank 44, the third slurry pump 45, the second cyclone 46, and is subjected to two-stage cyclone classification, and the lighter particle slurry classified out is sent to the classification and dehydration system 50. After the slurry passes through the first dehydration screen 51, the second dehydration screen 52 and the centrifugal dehydrator 53, the unburned carbon product with low water content is obtained.

[0036] The separation principle of the waste residue unburned carbon gravity separation system of the gasification furnace is as follows:

[0037] 1) The working principle of the classification system 30 is based on the difference in particle size of each component in the gasification slag slurry, and the particle size is classified by the screen aperture of the vibrating screen 31 and the different settling rates of coarse and fine particles in water in the classifier 32.

[0038] 2) The working principle of the separation system 40 is based on the difference in specific gravity of each component in the gasification slag slurry, and each component is settled in different zones in the tank according to the specific gravity by the combined action of the water flow, the gravity of each component and the friction between the component particles and the ground of the spiral chute. The components with small specific gravity are thrown to the outer edge in the rotary motion, and the components with large specific gravity move in the inner edge of the tank.

[0039] After the above-mentioned each sorting procedure, the high added value component in the gasification furnace waste residue can be separated, including unburned carbon and inorganic minerals, waste can be turned into treasure, and the environment is protected. The separated unburned carbon has the characteristics of low volatile, low sulfur, low sulfur, high ash, and is a rare carbon-based new material. It can be used as fuel, and also can be used as a good production raw material of various activated carbons, and has high economic benefits.

[0040] Obviously, the above examples are merely illustrative for clarity, and are not limiting to the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A gasifier slag unburned carbon gravity separation system characterized by, The application relates to a coal gasification furnace waste residue slurry system, which comprises the following parts: a slurry preparation system (20) which is connected with a storage system (10) of coal gasification furnace waste residue upstream and is used for dispersing the coal gasification furnace waste residue in water to form a uniform slurry; a classification system (30) which is connected downstream of the slurry preparation system (20) and is used for sequentially performing primary separation and particle size classification on the slurry delivered by the slurry preparation system (20); a separation system (40) which is connected downstream of the classification system (30) and has a plurality of separation mechanisms and is used for receiving the slurry with small particles delivered by the classification system (30) and performing a plurality of gravity classifications on the slurry; a classification dewatering system (50) which is connected downstream of the separation system (40) and has a plurality of dewatering mechanisms and is used for receiving the light particle slurry delivered by the separation system (40) and performing dewatering treatment on the light particle slurry.

2. The gravity separation system for unburned char in the residue of a gasifier according to claim 1, characterized in that, The slurry preparation system (20) comprises a slurry preparation tank (21), a stirrer (22) and a first slurry pump (23), the slurry preparation tank (21) is connected with the storage system (10), the stirrer (22) is arranged in the slurry preparation tank (21) and is used for stirring the slurry, and the first slurry pump (23) is connected between the slurry preparation tank (21) and the classification system (30) and is used for pumping the slurry in the slurry preparation tank (21) into the classification system (30).

3. The gravity separation system for unburned char in the residue of a gasifier according to claim 1, characterized in that, The classification system (30) comprises a vibrating screen (31) and a classifier (32), the vibrating screen (31) is connected with the slurry preparation system (20) and is used for performing primary separation on the coarse and fine particles of the slurry, and the classifier (32) is connected downstream of the vibrating screen (31) and is used for separating the slurry according to the particle size.

4. The gravity separation system for unburned char in the residue of a gasifier according to claim 1, characterized in that, The separation system (40) comprises at least two cyclone systems, a first cyclone system comprises a first slurry tank (41), a second slurry pump (42) and a first cyclone (43) which are sequentially and orderly connected, the first slurry tank (41) is connected upstream of the classification system (30), a second cyclone system comprises a second slurry tank (44), a third slurry pump (45) and a second cyclone (46) which are sequentially and orderly connected, and the second slurry tank (44) is connected upstream of the first cyclone (43).

5. The gravity separation system for unburned char in the residue of a gasifier according to claim 1, characterized in that, The classification dewatering system (50) comprises at least two dewatering screens, a first dewatering screen (51) is connected upstream of the separation system (40), a second dewatering screen (52) is connected downstream of the first dewatering screen (51), and a centrifugal dewatering machine (53) is connected downstream of the second dewatering screen (52).

6. A gravity separation system for unburnt char from gasification furnace slag according to any one of claims 1 to 5, characterized in that, The storage system (10) adopts a stockyard or a silo or a combination of the stockyard and the silo.

7. A gravity separation system for unburnt char from the slag of a gasifier according to any one of claims 1 to 5, characterized in that, The slurry preparation system (20) and the classification system (30), the classification system (30) and the separation system (40), and the separation system (40) and the classification dewatering system (50) are connected through pipelines, trenches, grooves or conveying machines.

8. The gravity separation system for unburned char in a gasification furnace slag according to claim 7, characterized in that, The conveying machine is a machine with horizontal and / or vertical conveying functions.

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