Process for producing high calorific value water-coal slurry by utilizing coal or coal gangue and coal gasification process adopting process

A technology of coal-water slurry and coal gangue, applied in the field of coal gasification process, can solve the problems of limited effect, high transportation cost, difficult absorption, etc., and achieve the effect of increasing profit space and stable and reliable operation.

Inactive Publication Date: 2017-10-20
SHENZHEN REVELATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually these mineral residues are only suitable for use as the lowest raw materials for brick or cement making or road paving, but if there is no brick or cement factory near the gasification plant, the high transportation cost makes it practically unusable
It has also been proposed to use these mineral residues as soil fertilizers or soil improvers, but the problem is that these mineral residues have been fully sintered or even vitrified after passing through the high-temperature

Method used

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  • Process for producing high calorific value water-coal slurry by utilizing coal or coal gangue and coal gasification process adopting process
  • Process for producing high calorific value water-coal slurry by utilizing coal or coal gangue and coal gasification process adopting process
  • Process for producing high calorific value water-coal slurry by utilizing coal or coal gangue and coal gasification process adopting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The low-quality coal used is peat with a mineral content of 30wt%, which is transported to the crusher for preliminary crushing, and then introduced into a wet mill for grinding to a particle size of less than 50 microns, adding water and additives for wet grinding and pulping . The prepared coal water slurry is stored in the coal water slurry storage tank, and the addition amount of the coal water slurry is controlled by the coal water slurry weighing instrument. The coal-water slurry is delivered to the micro-nano separation equipment at a pumping pressure of 0.3 MPa through the coal-water slurry feed pump and the coal-water slurry delivery pipeline.

[0037] The separation principle of the micro-nano separation equipment is based on the difference of particle surface properties and the principle of particle interference and sedimentation in the fluidized fluid, using a composite force field to separate hydrocarbon combustible material particles from mineral impurity ...

Embodiment 2

[0040] The low-quality coal used is lignite with a mineral content of 20wt%, which is transported to a crusher for primary crushing, and then introduced into a wet mill for grinding to a particle size of less than 450 microns, and then added with water and additives for wet grinding and pulping. The prepared coal water slurry is stored in the coal water slurry storage tank, and the addition amount of the coal water slurry is controlled by the coal water slurry weighing instrument. The coal-water slurry is delivered to the micro-nano separation equipment at a pumping pressure of 0.3 MPa through the coal-water slurry feed pump and the coal-water slurry delivery pipeline.

[0041] still use as figure 2 The equipment and method of operation shown. The diameter of the bubbles used for micro-nano separation is less than 200 microns. After the hydrocarbon combustible material particles are separated from the foam, some conventional additives can be added to prepare a suspension-st...

Embodiment 3

[0043] The coal gangue used is washed coal with a mineral content of 40wt%, which is transported to a crusher for preliminary crushing, then introduced into a wet mill and ground to a particle size of less than 100 microns, and then added with water and additives for wet mill adjustment pulp. The prepared coal water slurry is stored in the coal water slurry storage tank, and the addition amount of the coal water slurry is controlled by the coal water slurry weighing instrument. The coal-water slurry is delivered to the micro-nano separation equipment at a pumping pressure of 0.3 MPa through the coal-water slurry feed pump and the coal-water slurry delivery pipeline.

[0044] still use as figure 2 The equipment and method of operation shown. The diameter of the bubbles used for micro-nano separation is less than 80 microns. After the hydrocarbon combustible material particles are separated from the foam, some conventional additives can be added to prepare a suspension-stabl...

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Abstract

The invention discloses a process for producing high calorific value water-coal slurry by utilizing coal or coal gangue. The coal or the coal gangue comprises incombustible minerals and combustible containing carbon-hydrogen. The process comprises the following steps: A, wet grinding coal or coal gangue in water until an average particle size of particles is smaller than 500 micrometes, adding additives in a continuous wet grinding process, uniformly dispersing the additives, and obtaining micro-nano water-coal slurry; B, introducing micro-bubbles with a diameter smaller than 200 micrometers into the micro-nano water-coal slurry, wherein the mineral particles bonded with the additives are agglomerated and sunken as a bottom stream, wherein the combustible particles containing the carbon-hydrogen floats along with the bubbles to be a floating stream, so that the separation of the mineral particles and the combustible particles can be realized; and C, separating the combustible particles containing the carbon-hydrogen from the floating stream, and preparing the high calorific value water-coal slurry with a calorific value higher than 4000kcal/kg by virtue of press filtering. The invention also discloses a coal gasification process comprising the high calorific value water-coal slurry preparation process, so that inferior coal can be used for gasifying the water-coal slurry at first.

Description

technical field [0001] The invention belongs to the field of coal gasification technology, and in particular relates to a method for producing high calorific value coal-water slurry and by-product mineral compound fertilizer by utilizing coal or coal gangue. Background technique [0002] In the traditional coal gasification process, according to the different raw materials used in the gasifier, it is divided into dry coal gasification process and coal water slurry coal gasification process. The former directly carries dry coal powder into the gasifier with compressed gas for gasification , and the latter usually mix pulverized coal and water into a coal-water slurry and then enter the gasifier for gasification. Because the wet coal gasification process is superior to the dry coal gasification process in terms of feed continuity, stability, and cost, the former has more application prospects in industry. In fact, coal-water slurry gasification has been widely used. Almost a...

Claims

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Application Information

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IPC IPC(8): C10L1/32C05G1/00C10J3/46
CPCC05G1/00C10J3/46C10L1/326
Inventor 刘科翁力吴昌宁
Owner SHENZHEN REVELATION TECH CO LTD
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