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Comprehensive recycling process for gasification fine slag

A fine slag and process technology, applied in the field of comprehensive recovery and utilization of gasification fine slag, can solve the problems of high recovery cost, environmental pollution, low utilization rate of gasification fine slag, etc. Effect

Pending Publication Date: 2021-10-29
晋能控股装备制造集团华昱能源化工山西有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects of low utilization rate of gasification fine slag, high recycling cost and environmental pollution, the present invention provides a combination of decanter centrifuge and coal slime pump, feeding in dense phase zone of boiler to realize gasification of fine slag Efficient and clean comprehensive recovery and utilization, while realizing the comprehensive recovery and utilization process of gasification fine slag for boiler low-nitrogen combustion

Method used

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  • Comprehensive recycling process for gasification fine slag
  • Comprehensive recycling process for gasification fine slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The gasification fine slag comprehensive recycling process of this embodiment includes the following steps: the gasification fine slag is first sent from the settling tank 1 through the settling tank bottom flow pump 2 to the centrifuge 3 for solid-liquid separation of black water with high solid content, and the centrifuge After the machine 3, it enters the wet ash conveying system, falls into the mixing chamber 4, and carries out stirring treatment, and then controls the outlet to the screw feeder 5 through the hydraulic gate valve, and finally sends it to the compound coal slime after being pressurized by the wet ash conveying pump 6 After the pipeline is sent to the boiler for mixed combustion, the centrifuge 3 filtrate flows into the filtrate tank 9, and the filtrate in the filtrate tank 9 is sent back to the settling tank 1 by the filtrate pump 10 through the pipeline.

[0022] Further, high solid content black water 15wt% is sent to the centrifuge 3 for solid-liqu...

Embodiment 2

[0029] The gasification fine slag comprehensive recycling process of this embodiment includes the following steps: the gasification fine slag is first sent from the settling tank 1 through the settling tank bottom flow pump 2 to the centrifuge 3 for solid-liquid separation of black water with high solid content, and the centrifuge After the machine 3, it enters the wet ash conveying system, falls into the mixing chamber 4, and carries out stirring treatment, and then controls the outlet to the screw feeder 5 through the hydraulic gate valve, and finally sends it to the compound coal slime after being pressurized by the wet ash conveying pump 6 After the pipeline is sent to the boiler for mixed combustion, the centrifuge 3 filtrate flows into the filtrate tank 9, and the filtrate in the filtrate tank 9 is sent back to the settling tank 1 by the filtrate pump 10 through the pipeline.

[0030] Further, high solid content black water 20wt% is sent to the centrifuge 3 for solid-liqu...

Embodiment 3

[0037] The gasification fine slag comprehensive recycling process of this embodiment includes the following steps: the gasification fine slag is first sent from the settling tank 1 through the settling tank bottom flow pump 2 to the centrifuge 3 for solid-liquid separation of black water with high solid content, and the centrifuge After the machine 3, it enters the wet ash conveying system, falls into the mixing chamber 4, and carries out stirring treatment, and then controls the outlet to the screw feeder 5 through the hydraulic gate valve, and finally sends it to the compound coal slime after being pressurized by the wet ash conveying pump 6 After the pipeline is sent to the boiler for mixed combustion, the centrifuge 3 filtrate flows into the filtrate tank 9, and the filtrate in the filtrate tank 9 is sent back to the settling tank 1 by the filtrate pump 10 through the pipeline.

[0038] Further, high solid content black water 25wt% is sent to the centrifuge 3 for solid-liqu...

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Abstract

The invention discloses a comprehensive recycling process for gasification fine slag. The process comprises the following steps: firstly, high-solid-content black water of gasification fine slag is conveyed to a centrifugal machine from a settling tank through a settling tank underflow pump for solid-liquid separation, enters a wet ash conveying system after being discharged from the centrifugal machine, falls into a stirring bin and is stirred; then the ash is conveyed to a spiral feeder after passing through a hydraulic gate valve control outlet; and finally, after being pressurized by a wet ash conveying pump, the wet ash is conveyed to a composite coal slime pipeline and then is conveyed to a boiler for blending combustion and utilization; filtrate of the centrifugal machine flows into a filtrate tank by itself, and the filtrate in the filtrate tank is conveyed back to the settling tank by a filtrate pump through a pipeline. The process solves the problems of low utilization rate, high recovery cost and environmental pollution of the existing gasification fine slag. The horizontal spiral centrifugal machine and a coal slime pump are combined, feeding is conducted in a dense-phase area of the boiler, efficient and clean comprehensive recycling of gasification fine slag is achieved, and meanwhile low-nitrogen combustion of the boiler is achieved.

Description

technical field [0001] The invention belongs to the field of waste recovery and utilization, and in particular relates to a comprehensive recovery and utilization process of gasification fine slag. Background technique [0002] The comprehensive utilization of fine slag is a derivative problem brought about by the development of entrained bed gasification technology in the field of modern coal chemical industry. Taking Huayu Company as an example, the total amount of fine slag produced by aerospace furnaces is more than 70,000 tons (dry basis) throughout the year. How to efficiently and comprehensively utilize fine slag is a problem that is generally concerned in the industry. At present, most aerospace furnace devices are disposed of by stacking and selling (at extremely low prices), and a small amount of comprehensive recycling has basically not reached the level of fine utilization. The purpose of residual carbon in slag. [0003] The traditional space furnace fine slag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/38C02F9/02
CPCC02F1/38C02F9/00C02F2001/007C02F1/001
Inventor 牛宏宽陈洪伟罗俊杰张志凯吴华刘备战张玉良
Owner 晋能控股装备制造集团华昱能源化工山西有限责任公司
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