Method for preparing coal water slurry from sludge and gasified fine ash

A technology of coal-water slurry and fine ash, which is applied in the field of solid waste resource utilization, can solve the problems of small processing capacity, low concentration of sludge and gasification fine ash in mixing pulp, high water content, etc. Significant economic and environmental benefits, and the effect of preventing the concentration of coal-water slurry from decreasing

Pending Publication Date: 2022-04-22
CCTEG CLEAN ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The method of the present invention uses gasified fine ash and sludge blended coal to synergistically make pulp and gasify, and mainly solves the problems of high water content in sludge and gasified fine ash, low concentration of sludge and gasified fine ash, and low concentration of pulping. It can realize gasification fine ash and sludge reduction, harmless, high-value utilization of resources and quality. It has obvious practicability and advancement, and is suitable for large-scale promotion and use.

Method used

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  • Method for preparing coal water slurry from sludge and gasified fine ash
  • Method for preparing coal water slurry from sludge and gasified fine ash
  • Method for preparing coal water slurry from sludge and gasified fine ash

Examples

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Embodiment 1

[0058] This embodiment provides a kind of method that utilizes sludge and gasification fine ash to prepare coal-water slurry, such as figure 1 As shown, the method includes the following steps:

[0059] (1) During the production process of the entrained bed GE coal-water slurry gasification to olefins plant, the 1.4t / h chemical sludge produced is mixed with 9t / h municipal sludge to obtain sludge with a water content of 70%. After 160°C Heated for 1.5h to depolymerize bound water to obtain modified sludge with a viscosity of 1196mP·s; the resulting 22.5t / h gasified fine ash with a dry basis carbon content of 55wt% was sieved for high-carbon enrichment to obtain 9.4 t / h high-carbon fine ash with a moisture content of 60% and a carbon content of 85% by weight on a dry basis;

[0060] Finely grinding the slurry-forming medium with the modified sludge and the high-carbon fine ash to obtain a fine slurry, and the solid particles in the fine slurry have a particle size of 0.01-25 μm...

Embodiment 2

[0064] This embodiment provides a kind of method that utilizes sludge and gasification fine ash to prepare coal-water slurry, such as figure 1 As shown, the method includes the following steps:

[0065] (1) During the production process of the natural gas plant prepared by fixed-bed coal gasification, 12.1t / h of chemical sludge with a water content of 50% is produced, and sodium hydroxide solid is added to the chemical sludge to control the proportion of sodium hydroxide to the chemical sludge. 5wt% of the dry basis of the sludge, heated at 180°C for 1h for bound hydrolysis to obtain a modified sludge with a viscosity of 1445mP s; the gasified fine ash with a carbon content of 38wt% on a dry basis was produced by hydrocyclone+ Sieve for high carbon enrichment to obtain 20.2t / h high carbon fine ash with dry basis carbon content of 73wt% and moisture content of 70%;

[0066] Finely grinding the slurry-forming medium with the modified sludge and the high-carbon fine ash to obtai...

Embodiment 3

[0070] This embodiment provides a kind of method that utilizes sludge and gasification fine ash to prepare coal-water slurry, such as figure 1 As shown, the method includes the following steps:

[0071](1) In the production process of the oil product factory produced by entrained bed multi-nozzle coal water slurry gasification, produce 6.6t / h chemical sludge with a moisture content of 90%, add sodium hydroxide solid in the chemical sludge, control Sodium hydroxide accounts for 10wt% of the dry basis of chemical sludge. Stir at room temperature for 6 hours to carry out bound hydrolysis to obtain modified sludge with a viscosity of 287mP s; the gasified fine ash with a carbon content of 30wt% on a dry basis is produced by using High-carbon enrichment by electro-selection to obtain 3.3t / h high-carbon fine ash with a moisture content of 80% and a carbon content of 70wt% on a dry basis;

[0072] Finely grinding the slurry-forming medium with the modified sludge and the high-carbon...

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Abstract

The invention provides a method for preparing coal water slurry from sludge and gasified fine ash, which comprises the following steps: depolymerizing the sludge through bound hydrolysis to obtain modified sludge, enriching the gasified fine ash through high carbon to obtain high-carbon fine ash, and finely grinding the modified sludge and the high-carbon fine ash to obtain fine slurry; the coal water slurry is obtained by sequentially performing kneading mixing, shaping grinding and first screening on pulverized coal obtained after raw coal is subjected to superfine crushing, water, a dispersing agent and fine slurry, or sequentially performing grinding and second screening on the raw coal, the water, the dispersing agent and the fine slurry. According to the method disclosed by the invention, the gasified fine ash and the sludge are blended with the coal to synergistically prepare slurry and gasify, so that the problems that the sludge and the gasified fine ash are high in water content and difficult to treat, and the sludge and the gasified fine ash are low in slurry preparation concentration and small in treatment capacity after being blended are mainly solved, and the gasified fine ash and the sludge are subjected to reduction, harmlessness, resource, quality and high-value utilization; the method has obvious practicability and advancement and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a method for preparing coal-water slurry by utilizing sludge and gasified fine ash. Background technique [0002] Coal chemical industry is of great significance to alleviate my country's dependence on foreign oil and natural gas and ensure national energy security. Coal gasification, purification and synthesis are the key links of coal chemical industry and the core of realizing clean and efficient coal conversion. During this process, a large amount of gasification ash water and coal chemical wastewater will be generated. The product of gasification ash water after flocculation and sedimentation dehydration is called gasification fine ash (moisture content 40% to 60%). Inorganic sediments and residual sludge from biochemical treatment produced during coal chemical wastewater treatment are collectively referred to as chemical sludge (with a moisture ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
CPCC10L1/326
Inventor 张胜局何国锋柳金秋孙海勇段静李磊徐彤吕向阳刘烨炜严健常秋连陈明波郭志新王成江
Owner CCTEG CLEAN ENERGY CO LTD
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