A coal gasification slag purification process and a system for realizing the process

A technology for coal gasification slag and slag, which is applied in the petroleum industry, chemical instruments and methods, fuels, etc., can solve the problems of incomplete coal recovery and treatment, and achieve the effects of full utilization of energy, low equipment operation cost and high dehydration efficiency.

Active Publication Date: 2018-09-21
陕西融泰能源控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a process for purifying small-particle gasification slag and equipment for realizing the process, and solves the technical problem of incomplete recovery and treatment of coal in gasification slag in the prior art

Method used

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  • A coal gasification slag purification process and a system for realizing the process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the coal gasification slag purification process with a particle size of 0.5mm or less includes the following steps. First, the coal gasification slag is passed into the ash removal device 2 for ash removal, which can be realized by the ash removal device in the prior art. so as to get A d More than 60% high ash slag and A d Less than 60% low ash slag, the A d Refers to the dry base ash. That is to say, the proportion of the residue after complete combustion in a dry state. then A d The high-ash slag greater than 60% is discharged and sent to the coal gasification slag stacking site for treatment; then the low-ash slag with Ad less than 60% is sorted by a sorting device to obtain A d Less than 40% of clean coal, tailings or intermediates, intermediates refer to products whose ash content index in the sorting process is higher than the ash content requirements of concentrate ore and lower than the ash content requirements of tailings. The clean coal menti...

Embodiment 2

[0022] Example 2, on the basis of the above technical solution, the coal gasification slag with a particle size of 0.5 mm or less is prepared into a slurry with a concentration of 0-500 g / L. Then deash the coal gasification slag with particle size below 0.5mm to obtain A d More than 60% high ash pulp and A d Less than 60% low ash pulp; A d Less than 60% of the low ash pulp is sorted to obtain d Less than 40% of the clean coal, tailings, intermediates, and intermediates are returned to the sorting device for re-separation, and the clean coal and tailings are processed in the next step; the clean coal is dehydrated; the dehydrated clean coal is dried to obtain Coal with a water content of less than 20%; the tailings are concentrated to achieve solid-liquid separation. The high-ash slag that does not contain coal or has low coal content is removed by ash removal to reduce the energy consumption of clean coal dehydration and drying in the later stage; A d Less than 40% of clea...

Embodiment 4

[0024] Embodiment 4 Further, on the basis of the above technical solution, the impurity and ash removal device 1 is a slag grinder. By using the ash removal device as a slag grinder, the impurity removal is more thorough, and the energy consumption of dehydration and drying in the later stage is smaller.

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Abstract

The invention belongs to the technical field of coal gasification furnace slag treatment, and particularly relates to a coal gasification furnace slag purification technology and a system for realizing the technology. Coal furnace slag with the particle sizes smaller 0.5mm in a conventional coal furnace slag is purified, so that purification utilization of coal gasification furnace slag is realized, and the technical problem that coal of coal gasification furnace slag is insufficiently recycled and treated in the prior art is solved. By further dewatering and drying screened concentrate, burntcoal in a boiler can be directly utilized, energy sufficient utilization is realized, and environment pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal gasification slag treatment, and in particular relates to a coal gasification slag purification process and a system for realizing the process. Background technique [0002] Coal gasification technology refers to sending properly treated coal into a reactor such as a gasifier, and converting it into gas in a certain flow mode through an oxidant (air or oxygen and steam) at a certain temperature and pressure to obtain crude water. Coal gas, a technology that can obtain refined carbon monoxide gas through subsequent desulfurization and decarbonization processes, is an important way and means for clean utilization of coal resources. However, because the coal gasification is under-oxygen combustion in the gasifier, the carbon content in the slag after the combustion is basically between 20% and 30%, while most of the slag in the prior art is directly dumped, resulting in Waste of resources and pollute t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B9/06B03B7/00C10L5/04
Inventor 支羽轩何平
Owner 陕西融泰能源控股有限公司
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