System for separating and recycling carbon-ash in gasified ash

Abstract

The utility model discloses a system for separating and recycling carbon and ash in gasified ash. The system comprises a slag slurry mixing system, a multi-stage separation system, a tailing refining and storage system, a refined carbon dehydration and storage system, a coal slime filter-pressing dehydration system and a circulating water system, the slag slurry mixing system is used for obtaining uniform mixed slag slurry; the multi-stage separation system is used for receiving the mixed slag slurry and separating out wet sand, refined carbon and coal slime; the tailing refining and storing system is used for drying and powdering the wet sand and storing tailing products; the refined carbon dehydration and storage system is used for screening, dehydrating and drying carbon powder to obtain a refined carbon product; the coal slime filter-pressing dehydration system is used for filter-pressing dehydration of auxiliary product coal slime to obtain coal slime; and the circulating water system is used for supplying and collecting circulating water of the whole system. The utility model has the characteristic of realizing grading and sorting at different settling velocities.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon-ash separation recycling technical field, concretely relates to a kind of carbon-ash separation recycling system in gasification ash. BACKGROUND

[0002] With the development of modern coal chemical industry, entrained-flow gasification technology gradually becomes the mainstream of coal gasification technology, and a large amount of gasification ash with a moisture content of 40-60% is produced in the coal gasification process. Due to the influence of factors such as coal type difference, gasification conditions, and operating conditions, the carbon residue content of the gasification ash varies, and the appearance varies. The ash is divided into fine ash accounting for 20-40% and coarse slag accounting for 60-80%, and the ash appears different in appearance with different gasification furnace operating conditions. Due to the characteristics of high moisture content, high loss on ignition, and wide particle size distribution, the ash is difficult to be effectively utilized.

[0003] At present, the main treatment methods of gasification ash are traditional landfill and boiler blending, etc. The disadvantages of traditional landfill method are waste of a large amount of land resources, imperfect protection measures, easy secondary pollution, and not conducive to the sustainable development of coal chemical enterprises. After the coal gasification reaction process, the physicochemical properties of the ash have changed, and the direct feeding into the conventional boiler for blending has poor economic benefits. Therefore, it is imperative and urgent to develop efficient, economic, and environmentally friendly classification methods for treating gasification ash and to accelerate the development of key technologies for large-scale and high-value resource utilization of coal gasification ash.

[0004] As an important source of three waste products, the ash has the characteristics of fine particle size, developed pores, strong adsorption capacity, and strong water retention, and how to carry out efficient separation of carbon-ash components in the ash is a key scientific problem.

[0005] The chemical composition characteristics and special mineral phase composition of the ash, which are rich in silicon, aluminum, and carbon resources, are the basis for the recycling of the ash, and the efficient separation of carbon-ash is the primary step for the comprehensive utilization of gasification slag.

[0006] At present, the main separation methods of gasification ash are flotation, gravity separation, and electric separation.

[0007] Flotation is a mineral processing process that separates solid minerals from ore slurry according to the differences in the physical and chemical properties of the mineral surface, and is suitable for processing fine and micro particle materials. However, the molten mineral in the ash has strong hydrophilicity, which affects the stability of the flotation foam. The gasification ash has developed pores and strong adsorption capacity, and the flotation reagent is adsorbed into the developed pores, resulting in large reagent consumption and poor running effect.

[0008] The gravity separation method is based on the different specific gravity of minerals and the different settling velocity in medium. In the screening-gravity separation process, low-carbon slag with low carbon content, fuel product with high carbon content and high-carbon fine ash product are obtained. However, there is less research on the classification of gasification ash by using gravity separation equipment such as heavy medium cyclone, interference bed separator and jig. In the gravity separation process, the fine particles are subjected to relatively weak separation force in the single gravity field, and the separation effect of the single equipment is poor.

[0009] The electric separation method is based on the electrical physical properties and the charging difference of mineral particles, and the carbon particles and mineral particles are separated under the action of static electricity, friction and the like. The separation is greatly affected by factors such as voltage level, electric field intensity and wind size. With the decrease of the particle size of the mineral particles, the separation difficulty of the carbon and the mineral increases, the electrostatic interference between the components becomes stronger, the separation effect is affected, and the industrialization and large-scale standard cannot be reached.

[0010] In summary, the prior art has the following defects in the treatment and separation of gasification ash:

[0011] 1. Treatment method: The traditional landfill wastes a large amount of land resources, and if the protection measures are not perfect, secondary pollution is easy to occur, which is not conducive to the sustainable development of coal chemical enterprises; the ash after the gasification reaction of the boiler mixed with coal changes in physical and chemical properties, and is directly sent to the conventional boiler for mixed combustion, which has poor economic benefits.

[0012] 2. Separation method: The floatation method is affected by the strong hydrophilicity of the molten mineral in the ash, which affects the stability of the floatation foam. The ash has developed pores and strong adsorption capacity, which causes the floatation reagent to be adsorbed into the pores, resulting in large reagent consumption and poor running effect. The gravity separation method uses gravity separation equipment such as heavy medium cyclone, interference bed separator and jig for classification of gasification ash. In the gravity separation process, the fine particles are subjected to relatively weak separation force in the single gravity field, and the separation effect of the single equipment is poor. The electric separation method is greatly affected by factors such as voltage level, electric field intensity and wind size. With the decrease of the particle size of the mineral particles, the separation difficulty of the carbon and the mineral increases, the electrostatic interference between the components becomes stronger, the separation effect is affected, and the industrialization and large-scale standard cannot be reached. Practical new type content

[0013] In order to overcome the above technical problems, the purpose of the present application is to provide a carbon-ash separation and recycling system in gasification ash, which provides a physical separation system with simple structure, medium floatation + classification cyclone + centrifugal separation, and uses the density and particle size difference of the ash particles in the fluidized bed to realize different settling velocities and classification and separation.

[0014] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0015] A carbon-ash separation and recycling system for gasification ash, a slag slurry mixing system, a multi-stage separation system, a tailings refining and storage system, a refined carbon dehydration and storage system, a coal slime pressure filtration dehydration system, and a circulating water system.

[0016] The slag slurry mixing system is used for the preliminary mixing of the raw material fine slag 1 and the circulating water. After mixing, the formed slag slurry is separated from fine ash by the fine slag vibration separation device 25, and the remaining slag slurry is mixed with the raw material coarse slag 2 in the slag slurry mixing tank 4 to obtain uniform mixed slag slurry.

[0017] The multi-stage separation system is used for receiving the mixed slag slurry and separating wet sand, refined carbon, and coal slime.

[0018] The tailings refining and storage system is used for drying, powdering, and storing tailings products separated by the multi-stage separation system.

[0019] The refined carbon dehydration and storage system is used for screening, dehydrating, drying, and obtaining product refined carbon from carbon powder separated by the multi-stage separation system.

[0020] The coal slime pressure filtration dehydration system is used for pressure filtration dehydration of the auxiliary product coal slime separated by the multi-stage separation system to obtain coal slime.

[0021] The circulating water system is used for the supply and collection of circulating water in the entire system.

[0022] The slag slurry mixing system includes a fine slag mixing device 3, a fine slag vibration separation device 25, and a slag slurry mixing tank 4.

[0023] The fine slag mixing device 3 inlet input end is connected to the output end of the raw material fine slag 1 and the output end of the high-pressure water pump one 30, respectively. The output end of the fine slag mixing device 3 is connected to the fine slag vibration separation device 25. The lower part of the fine slag vibration separation device 25 is connected to the coal slime pressure filtration dehydration system, and the upper part is connected to the slag slurry mixing tank 4. The slag slurry mixing tank 4 simultaneously receives the output of the raw material coarse slag 2 and the water supply of the high-pressure water pump two 31.

[0024] The fine slag vibration separation device 25 is a wet vibrating screen separation device.

[0025] The multi-stage separation system includes a coarse sand classifier 5, a slag slurry overflow tank 6, a slag slurry pump 7, a slag slurry conveying pipeline 8, a multi-stage separation device 9, a multi-stage separation carbon powder outlet 10, a multi-stage separation fine sand outlet 17, and a multi-stage separation coal slime outlet 18.

[0026] The top of the coarse sand classifier 5 is connected with the coarse residue slurry output end of the bottom of the residue slurry mixing tank 4, the outlet of the coarse sand classifier 5 is provided with a residue slurry overflow tank 6, the residue slurry overflow tank 6 is connected with a multi-stage separation device 9 through a residue slurry conveying pipeline 8, liquid material is sent to the multi-stage separation device 9 through the residue slurry conveying pipeline 8, the bottom of the residue slurry overflow tank 6 is provided with a residue slurry pump 7, the residue slurry pump 7 provides power for liquid material conveying, the output end of the multi-stage separation device 9 is respectively provided with a multi-stage separation fine sand outlet 17, a multi-stage separation carbon powder outlet 10 and a multi-stage separation coal slime outlet 18, the multi-stage separation fine sand outlet 17 is connected with the coarse sand classifier 5, the multi-stage separation carbon powder outlet 10 is connected with a fine carbon dehydration and storage system, and the multi-stage separation coal slime outlet 18 is connected with a coal slime filter pressing dehydration system;

[0027] The coarse sand classifier 5 is connected with a tailing refining and storage system through a classifier coarse wet sand outlet 19.

[0028] The multi-stage separation device 9 is a spiral cyclone separation structure.

[0029] The tailing refining and storage system comprises a wet sand conveying belt 20, a tailing drying system 21, a tailing powder making system 22, a tailing powder pneumatic conveying device 23 and a tailing powder storage device 24.

[0030] The wet sand conveying belt 20 is arranged at the output end of the classifier coarse wet sand outlet 19 and used for conveying the material output by the classifier coarse wet sand outlet 19, and the output end of the wet sand conveying belt 20 is sequentially connected with the tailing drying system 21, the tailing powder making system 22, the tailing powder pneumatic conveying device 23 and the tailing powder storage device 24.

[0031] The tailing drying system 21 is a belt drying device, the tailing powder making system 22 is a jaw crusher, the tailing powder pneumatic conveying device 23 adopts a dilute phase pneumatic conveying device, and the tailing powder storage device 24 is a bottom wide-mouth spiral conveying tank.

[0032] The fine carbon dehydration and storage system comprises a coarse carbon vibration ash removal device 11, a fine carbon dehydration device 12, a fine carbon drying device 13, a fine carbon pneumatic conveying device 15 and a fine carbon storage device 16.

[0033] The output end of the multi-stage separation carbon powder outlet 10 is sequentially connected with the coarse carbon vibration ash removal device 11, the fine carbon dehydration device 12, the fine carbon drying device 13, the fine carbon pneumatic conveying device 15 and the fine carbon storage device 16.

[0034] The coarse carbon vibration ash removal device 11 is a vibration screening device, the fine carbon pneumatic conveying device 15 adopts a dilute phase pneumatic conveying device, and the material outlet end at the bottom of the coarse carbon vibration ash removal device 11 is connected with a coal slime filter pressing device 26.

[0035] The coal slime pressure filtration dewatering system comprises a coal slime pressure filtration device 26, a pressure filtration water return pipeline 28 and a coal slime external transport vehicle 27.

[0036] The coal slime of the multi-stage separation coal slime outlet 18 and the fine slag vibration separation device 25 is conveyed to the coal slime pressure filtration device 26 under the action of gravity, and the coal slime pressure filtration device 26 is connected with the pressure filtration water return pipeline 28 and the coal slime external transport vehicle 27.

[0037] The output end of the pressure filtration water return pipeline 28 is connected with a circulating water pool 29.

[0038] The circulating water system comprises the circulating water pool 29, a high-pressure water pump one 30, a high-pressure water pump two 31 and a fine carbon dewatering recovery pipeline.

[0039] The circulating water system is provided with the circulating water pool 29, and the high-pressure water pump one 30 and the high-pressure water pump two 31 are used to respectively send the circulating water to the fine slag mixing device 3 and the slurry mixing tank 4 of the multi-stage separation system, and the circulating water system simultaneously receives the circulating water of the pressure filtration water return pipeline 28 and the fine carbon dewatering recovery pipeline, and the circulating water system is provided with a circulating water self-cleaning device.

[0040] The circulating water pool 29 is connected with a pipeline of fresh water supplement 14.

[0041] The coal gasification ash separation device has the advantages that:

[0042] 1. The coal gasification ash separation device can simultaneously process the coarse slag and the fine slag generated by any form of coal gasification furnace, does not need to mix the coarse slag and the fine slag in advance, has small requirements on the particle size and the water content of the ash, and greatly reduces the requirements on the properties of the raw materials;

[0043] 2. The coal gasification ash separation device is environmentally friendly and has no pollution.

[0044] 3. The coal gasification ash separation device has large processing capacity and low operation cost.

[0045] 4. The coal gasification ash separation device has good product selectivity and wide application. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The system is a schematic view of the utility model.

[0047] In the figure: 1, raw material fine slag; 2, raw material coarse slag; 3, fine slag mixing device; 4, fine slag vibrating slurry mixing tank; 5, coarse sand classifier; 6, slurry overflow tank; 7, slurry pump; 8, slurry conveying pipeline; 9, multi-stage separation device; 10, multi-stage separation carbon powder outlet; 11, coarse carbon vibrating ash removal device; 12, fine carbon dehydration device; 13, fine carbon drying device; 14, fresh water supplement; 15, fine carbon pneumatic conveying device; 16, fine carbon storage device; 17, multi-stage separation fine sand outlet 1~3; 18, multi-stage separation coal slime outlet; 19, classifier coarse wet sand outlet; 20, wet sand conveying belt; 21, tailing drying system; 22, tailing powder making system; 23, tailing powder pneumatic conveying device; 24, tailing powder storage device; 25, fine slag vibrating separation device; 26, coal slime filter pressing device; 27, coal slime external transport vehicle; 28, filter pressing water return pipeline; 29, circulating water tank; 30, high-pressure water pump one; 31, high-pressure water pump two. DETAILED DESCRIPTION

[0048] The utility model will be further explained in detail in connection with the drawings.

[0049] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0050] As Figure 1 Indicated, a carbon-ash separation and recycling system in gasification ash, slurry mixing system, multi-stage separation system, tailing refining and storage system, fine carbon dehydration and storage system, coal slime filter pressing dehydration system, circulating water system;

[0051] The slurry mixing system is used for the preliminary mixing of raw material fine slag 1 and circulating water, and the mixed slurry is separated from fine ash by fine slag vibrating separation device 25, and the remaining slurry is mixed with raw material coarse slag 2 in slurry mixing tank 4, to obtain uniform mixed slurry.

[0052] The multi-stage separation system is used for receiving mixed slurry and separating wet sand, fine carbon and coal slime;

[0053] The tailing refining and storage system is used for drying, powder making of the wet sand separated by the multi-stage separation system and storing tailing products;

[0054] The fine carbon dehydration and storage system is used for screening, dehydration, drying of the carbon powder separated by the multi-stage separation system and obtaining product fine carbon;

[0055] The coal slime filter pressing dehydration system is used for filter pressing and dehydrating the auxiliary product coal slime separated by the multi-stage separation system, to obtain coal slime;

[0056] The circulating water system is used for supply and collection of circulating water of the whole system;

[0057] The slag slurry mixing system comprises raw material fine slag 1, raw material coarse slag 2, fine slag mixing device 3, fine slag vibration separation device 25, and slag slurry mixing tank 4.

[0058] The fine slag mixing device 3 is connected with the raw material fine slag 1 and high-pressure water pump 1 30 at the input end and connected with the fine slag vibration separation device 25 at the output end.

[0059] The multi-stage separation system comprises coarse sand classifier 5, slag slurry overflow tank 6, slag slurry pump 7, slag slurry conveying pipeline 8, multi-stage separation device 9, multi-stage separation carbon powder outlet 10, multi-stage separation fine sand outlet 17, and multi-stage separation coal slime outlet 18.

[0060] The fine slag vibration separation device 25 is a wet vibrating screen separator.

[0061] The multi-stage separation system comprises coarse sand classifier 5, slag slurry overflow tank 6, slag slurry pump 7, slag slurry conveying pipeline 8, multi-stage separation device 9, multi-stage separation carbon powder outlet 10, multi-stage separation fine sand outlet 17, and multi-stage separation coal slime outlet 18.

[0062] The multi-stage separation system receives the coarse slag slurry of the slag slurry mixing tank 4 of the slag slurry mixing system, the coarse slag slurry enters the coarse sand classifier 5, the slag slurry overflow tank 6 is arranged at the outlet of the coarse sand classifier 5, the slag slurry pump 7 is arranged at the bottom of the slag slurry overflow tank 6, the liquid material is sent to the multi-stage separation device 9 through the slag slurry conveying pipeline 8, the multi-stage separation fine sand outlet 17, the multi-stage separation carbon powder outlet 10, and the multi-stage separation coal slime outlet 18 are arranged at the bottom of the multi-stage separation device 9 and respectively return to the coarse sand classifier 5, the fine carbon dehydration and storage system, and the coal slime pressure filtration dehydration system, and the wet sand separated by the coarse sand classifier 5 is connected to the tailing refining and storage system through the high-position outlet.

[0063] The multi-stage separation device 9 is a spiral cyclone separation structure.

[0064] The tailing refining and storage system comprises wet sand conveying belt 20, tailing drying system 21, tailing powder system 22, tailing powder pneumatic conveying device 23, and tailing powder storage device 24.

[0065] The tailing refining and storage system receives the material of the wet sand conveying belt 20, and the wet sand conveying belt 20 is connected with the separation outlet of the coarse sand classifier 5.

[0066] The outlet end of the wet sand conveying belt 20 is connected with tailing drying system 21, tailing powder system 22, tailing powder pneumatic conveying device 23 and tailing powder storage device 24 in sequence.

[0067] The tailing drying system 21 is a belt drying device.

[0068] The tailing powder system 22 adopts a jaw crusher.

[0069] The tailing powder pneumatic conveying device 23 adopts a dilute phase pneumatic conveying device.

[0070] The tailing powder storage device 24 is a bottom wide mouth screw conveying tank.

[0071] The fine carbon dehydration and storage system comprises coarse carbon vibrating ash removal device 11, fine carbon dehydration device 12, fine carbon drying device 13, fine carbon pneumatic conveying device 15 and fine carbon storage device 16.

[0072] The output end of the multi-stage separation carbon powder outlet 10 is connected with coarse carbon vibrating ash removal device 11, fine carbon dehydration device 12, fine carbon drying device 13, fine carbon pneumatic conveying device 15 and fine carbon storage device 16 in sequence.

[0073] The coarse carbon vibrating ash removal device 11 is a vibrating screen device.

[0074] The fine carbon pneumatic conveying device 15 adopts a dilute phase pneumatic conveying device.

[0075] The material outlet end at the bottom of the coarse carbon vibrating ash removal device 11 is connected with coal slime pressure filtration device 26.

[0076] The coal slime pressure filtration dehydration system comprises coal slime pressure filtration device 26, pressure filtration water return pipeline 28 and coal slime external transport vehicle 27.

[0077] The coal slime at the multi-stage separation coal slime outlet 18 and the fine coal at the fine coal vibrating separation device 25 of the slurry mixing system are conveyed to the coal slime pressure filtration device 26 under the action of gravity, and the coal slime pressure filtration device 26 is connected with the pressure filtration water return pipeline 28 and the coal slime external transport vehicle 27.

[0078] The output end of the pressure filtration water return pipeline 28 is connected with circulating water pool 29.

[0079] The circulating water system comprises circulating water pool 29, high-pressure water pump one 30, high-pressure water pump two 31, fine carbon dehydration recovery pipeline and fresh water supplement 14.

[0080] The circulating water system sets the circulating water pool 29, and uses the high-pressure water pump one 30 and the high-pressure water pump two 31 to respectively send the circulating water to the fine coal mixing device 3 and the slurry mixing tank 4 of the multi-stage separation system, and simultaneously receives the circulating water of the pressure filtration water return pipeline 28 and the fine carbon dehydration recovery pipeline. The circulating water system sets a circulating water self-cleaning device.

[0081] The technology can process various dry and wet ash, and the water consumption can be adjusted according to the water content of the ash, and no waste water is generated;

[0082] The mixing ratio of fine ash and water in the fine ash mixing device 3 is 1 / 10 to 1 / 2;

[0083] The coarse ash and water in the slag slurry mixing tank 4 are mixed according to a certain ratio and then enter the first-stage spiral separator, and the mixing ratio is 1 / 6 to 1 / 2;

[0084] The adjustment range of the multi-stage separation device 9 is 15° to 30°, and the angle of the multi-stage separation device 9 can be adjusted according to different raw materials, so that the flow direction of particles of different particle sizes can be accurately controlled, and the carbon content in the separated carbon can be increased to 70 to 95%.

[0085] The water content of the separated tailings is about 10 to 35%, and the tailings drying system dries the tailings to a water content of less than 4%. The circulating water can be recycled after flocculation and sedimentation in the circulating water pool, no sewage is generated, and the water consumption is less than 1% of the ash treatment amount.

[0086] The multi-stage separation device 9 has a multi-stage separation carbon powder outlet 10, a multi-stage separation fine sand outlet 17 and a multi-stage separation coal slime outlet 18, and a plurality of fine outlets are arranged, and each outlet has a fine grade number greater than or equal to 3, so that materials of different particle sizes and densities can be accurately separated. The fine carbon separated by the multi-stage separation device 9 enters a screen, the screen aperture can be 30 to 100 microns, and the ash and a small amount of coal slime smaller than the screen aperture are separated by vibration, and the fine carbon is collected from the upper part of the vibration separator and then sent to a fine carbon conveying device.

[0087] The specific implementation method of the utility model is as follows:

[0088] First, the fine ash and water are mixed according to a certain ratio, the coarse ash and coal slime are separated by a vibration separator, the coal slime is directly sent to a coal slime bin after being dried by a filter press, and then is transported and treated, and the high-carbon fine ash and the tailings mixture separated are mixed with circulating water and then enter the slag slurry mixing tank 4.

[0089] Next, the slag slurry mixing tank 4 of the multi-stage separation system is connected to the fine slag slurry and the coarse slag slurry upwards, and is connected to the coarse sand classifier 5, the low-position outlet of the coarse sand classifier 5 is connected to the slag slurry overflow tank 6, the bottom of the slag slurry overflow tank 6 is provided with a slag slurry pump 7, the slag slurry pump 7 sends the material to the multi-stage separation device 9 through a slag slurry conveying pipeline 8, the multi-stage separation device 9 is provided with a multi-stage separation fine sand outlet 17, a multi-stage separation carbon powder outlet 10 and a multi-stage separation coal slime outlet 18, and returns to the coarse sand classifier 5 of the multi-stage separation system, a fine carbon dehydration and storage system and a coal slime filter pressing dehydration system downwards, and the high-position outlet of the coarse sand classifier 5 is connected to a wet sand conveying belt 20.

[0090] Next, the separated tailings with moisture content of about 10-35% is dried by combustion heating to less than 4% moisture content, crushed to 40-200 μm by a crusher, and transported by a tailings powder pneumatic conveying device 23 to a tailings powder storage device 24 for storage as a raw material for producing mortar.

[0091] Next, the refined carbon produced by the multi-stage separation carbon powder outlet 10 of the multi-stage separation device 9 is sequentially introduced into a coarse carbon vibration ash removal device 11, a refined carbon dehydration device 12, a refined carbon drying device 13, and a refined carbon pneumatic conveying device 15, which realizes a 30-100 μm particle vibration separator, separates ash and a small amount of coal slime less than 30-50 μm, and most of the separated carbon powder is dehydrated, dried, and then conveyed by pneumatic conveying to a refined carbon storage device 16.

[0092] Next, the coal slime pressure filtration device 26 receives coal slime from the fine slag vibration separation device 25, the coarse carbon vibration ash removal device 11, and the multi-stage separation coal slime outlet 18, dehydrates the coal slime by pressure filtration, and then sends the circulating water and the coal slime to the pressure filtration water return device 28 and the coal slime delivery vehicle 27, respectively.

[0093] Next, the circulating water is stored in a circulating water pool 29, and is sent to the fine slag mixing device 3 and the slag slurry mixing tank 4 by high-pressure water pumps 30 and 31, while receiving circulating water from the pressure filtration water return pipeline 28 and the refined carbon dehydration recovery pipeline. The circulating water system is provided with a circulating water self-cleaning device, and the circulating water can be recycled after flocculation and sedimentation.

[0094] In the coarse sand classifier 5, when the settling velocity of the ash and slag particles is less than or equal to the upward flow velocity, the ash and slag particles are in suspension in the separation to form a separation bed, and are sequentially introduced into the slag slurry overflow tank 6 and the multi-stage separation device 9; when the settling velocity of the ash and slag particles is greater than the upward flow velocity, the ash and slag particles are discharged from the underflow port of the coarse sand classifier 5 to form tailings, and the separation and recovery of the ash and slag are realized. In the cyclone separator, the centrifugal sedimentation principle is used to increase the flow path and improve the settling velocity, prolong the residence time of the suspension in the device, form an outer layer of concentrated liquid, a middle layer of transition liquid, and an inner layer of clear liquid, and then perform deep separation to improve the separation effect of the solid particles in the suspension.

[0095] The carbon-ash separation and recycling system of the gasification ash has the following characteristics: in the raw material treatment, it has wide applicability and flexible mixing ratio, can handle various types of gasifier coarse slag, fine slag, has low requirement for ash quality and flexible mixing ratio; environmental protection and resource recycling are excellent, physical separation system is adopted to avoid secondary pollution, circulating water is efficiently recycled, water consumption is small. The separation precision and efficiency are high, the multi-stage separation device 9 can accurately control the particle flow direction and accurately separate, and the quality and purity of the fine carbon are improved; the system operation has obvious advantages, the treatment capacity is large, the cost is low, the operation is simple and easy to maintain; the products have diversity and high value, can extract various components to form fine carbon, activated carbon, dry-mixed mortar and other products, and are applied to multiple industries, realizing ash resource utilization and reducing the amount of utilization, and having environmental protection and economic value.

Claims

1. A system for carbon-ash separation and recycling in gasification ash, characterized by, Slag slurry mixing system, multi-stage separation system, tailings refining and storage system, refined carbon dehydration and storage system, coal slime pressure filtration dehydration system, circulating water system; The slag slurry mixing system is used for the preliminary mixing of raw material fine slag (1) and circulating water, and the formed slag slurry after mixing is subjected to fine ash removal through a fine slag vibration separation device (25), and the remaining slag slurry is mixed with raw material coarse slag (2) in a slag slurry mixing tank (4) to obtain uniform mixed slag slurry. The multi-stage separation system is used for receiving the mixed slag slurry and separating wet sand, refined carbon and coal slime. The tailings refining and storage system is used for drying, powdering and storing tailings products separated by the multi-stage separation system. The refined carbon dehydration and storage system is used for screening, dehydration and drying of carbon powder separated by the multi-stage separation system to obtain refined carbon products. The coal slime pressure filtration dehydration system is used for pressure filtration dehydration of the auxiliary product coal slime separated by the multi-stage separation system to obtain coal slime. The circulating water system is used for supplying and collecting circulating water of the entire system.

2. The carbon-ash separation and recycling system for gasification ash according to claim 1, characterized in that, The slag slurry mixing system comprises a fine slag mixing device (3), a fine slag vibration separation device (25) and a slag slurry mixing tank (4). The fine slag mixing device (3) is connected with the output end of the high-pressure water pump I (30) and the output end of the raw material fine slag (1) respectively, and the output end of the fine slag mixing device (3) is connected with the fine slag vibration separation device (25), the lower part of the fine slag vibration separation device (25) is connected with the coal slime pressure filtration dehydration system, and the upper part of the fine slag vibration separation device (25) is connected with the slag slurry mixing tank (4), which simultaneously receives the output of the raw material coarse slag (2) and the water supply of the high-pressure water pump II (31). The fine slag vibration separation device (25) is a wet method vibration sieve separation device.

3. The carbon-ash separation and recycling system in gasification ash according to claim 2, characterized in that, The multi-stage separation system comprises a coarse sand classifier (5), a slag slurry overflow tank (6), a slag slurry pump (7), a slag slurry conveying pipeline (8), a multi-stage separation device (9), a multi-stage separation carbon powder outlet (10), a multi-stage separation fine sand outlet (17) and a multi-stage separation coal slime outlet (18). The coarse sand classifier (5) is connected with the coarse slag slurry output end at the bottom of the slag slurry mixing tank (4) at the top, the outlet of the coarse sand classifier (5) is provided with the slag slurry overflow tank (6), the slag slurry overflow tank (6) is connected with the multi-stage separation device (9) through the slag slurry conveying pipeline (8), liquid material is sent to the multi-stage separation device (9) through the slag slurry conveying pipeline (8), the slag slurry pump (7) is arranged at the bottom of the slag slurry overflow tank (6), the slag slurry pump (7) provides power for liquid material conveying, the output end of the multi-stage separation device (9) is respectively provided with the multi-stage separation fine sand outlet (17), the multi-stage separation carbon powder outlet (10) and the multi-stage separation coal slime outlet (18), the multi-stage separation fine sand outlet (17) is connected with the coarse sand classifier (5), the multi-stage separation carbon powder outlet (10) is connected with the refined carbon dehydration and storage system, and the multi-stage separation coal slime outlet (18) is connected with the coal slime pressure filtration dehydration system. The coarse sand classifier (5) is connected with the tailings refining and storage system through the classifier coarse wet sand outlet (19). The multi-stage separation device (9) is a spiral cyclone separation structure.

4. The carbon-ash separation and recycling system in gasification ash according to claim 3, characterized in that, The tailings refining and storage system comprises a wet sand conveying belt (20), a tailings drying system (21), a tailings powdering system (22), a tailings powder pneumatic conveying device (23), and a tailings powder storage device (24). The wet sand conveying belt (20) is arranged at the output end of the classifier coarse wet sand outlet (19) and used for conveying the material output by the classifier coarse wet sand outlet (19), and the output end of the wet sand conveying belt (20) is sequentially connected with the tailings drying system (21), the tailings powdering system (22), the tailings powder pneumatic conveying device (23), and the tailings powder storage device (24).

5. The carbon-ash separation and recycling system in gasification ash according to claim 4, characterized in that, The tailings drying system (21) is a belt drying device, the tailings powdering system (22) is a jaw crusher, the tailings powder pneumatic conveying device (23) is a dilute phase pneumatic conveying device, and the tailings powder storage device (24) is a bottom wide-mouth screw conveying tank.

6. The carbon-ash separation and recycling system in gasification ash according to claim 3, characterized in that, The refined carbon dehydration and storage system comprises a coarse carbon vibration ash removal device (11), a refined carbon dehydration device (12), a refined carbon drying device (13), a refined carbon pneumatic conveying device (15), and a refined carbon storage device (16). The output end of the multi-stage separation carbon powder outlet (10) is sequentially connected with the coarse carbon vibration ash removal device (11), the refined carbon dehydration device (12), the refined carbon drying device (13), the refined carbon pneumatic conveying device (15), and the refined carbon storage device (16). The coarse carbon vibration ash removal device (11) is a vibrating screen device, the refined carbon pneumatic conveying device (15) is a dilute phase pneumatic conveying device, and the material outlet end at the bottom of the coarse carbon vibration ash removal device (11) is connected with a coal slime pressure filtration device (26).

7. The carbon-ash separation and recycling system in gasification ash according to claim 6, characterized in that, The coal slime pressure filtration dehydration system comprises the coal slime pressure filtration device (26), a pressure filtration water return pipeline (28), and a coal slime external transport vehicle (27). The coal slime at the multi-stage separation coal slime outlet (18) and the fine slag vibration separation device (25) is conveyed to the coal slime pressure filtration device (26) under the action of gravity, the coal slime pressure filtration device (26) is connected with the pressure filtration water return pipeline (28) and the coal slime external transport vehicle (27). The output end of the pressure filtration water return pipeline (28) is connected with a circulating water pool (29).

8. The carbon-ash separation and recycling system in gasification ash according to claim 7, characterized in that, The circulating water system comprises the circulating water pool (29), a high-pressure water pump one (30), a high-pressure water pump two (31), and a refined carbon dehydration recovery pipeline. The circulating water system is provided with the circulating water pool (29), the high-pressure water pump one (30), and the high-pressure water pump two (31) are respectively used for sending the circulating water to the fine slag mixing device (3) and the slurry mixing tank (4) of the multi-stage separation system, and simultaneously receiving the circulating water of the pressure filtration water return pipeline (28) and the coal slime external transport vehicle (27), and the circulating water system is provided with a circulating water self-cleaning device. The circulating water pool (29) is connected with a pipeline of fresh water supplement (14).

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