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Coal modification method

A technology of coal upgrading and low-grade coal, which is applied in special forms of dry distillation, petroleum industry, solid fuel, etc. It can solve problems such as difficult deposition, achieve the effect of reducing calorific value and moisture content, and increasing calorific value

Inactive Publication Date: 2020-02-04
魏廷锦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the tar at room temperature spreads directly on the heat-treated coal, it is difficult to deposit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The coal upgrading method of the present invention will be described in detail below through examples.

[0016] The coal upgrading method described in the present invention heat-treats low-rank coal at a temperature not exceeding 600°C to dehydrate the coal, pyrolyzes hydrogen-containing oxygen-containing groups and distills tar; by steaming the heat-treated coal and tar Contact, coating the tar on the surface of the heat-treated coal to 300°C while keeping the temperature of the coal 150°C below the temperature of the tar vapor. It also includes drying the low-rank coal at a temperature lower than 200°C before the heat treatment; the temperature of the heat treatment step is 200°C to 600°C. The distillation of the tar includes: collecting various gases including tar vapor; cooling the various gases to condense the tar vapor; separating the condensed tar from other gases; and evaporating the condensed tar to generate the tar vapor. The tar vapor produced in the evapora...

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PUM

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Abstract

A coal modification method belongs to the technical field of coal modification. The method is characterized in that low-grade coal is subjected to heat treatment at a temperature of 600 DEG C or belowso as to dehydrate the coal, a hydrogen-containing and oxygen-containing group is pyrolyzed, and tar is distilled out; and the heat-treated coal is in contact with tar steam, the surface of the heat-treated coal is coated with the tar, and is heated to 300 DEG C, and the temperature of the coal is lower than the temperature of the tar steam of 150 DEG C. The coal can be uniformly coated with tar,and upgraded coal obtained in the invention has reduced moisture during and after transportation or storage, and also has an increased calorific value per unit weight. The levelness, the heat value and the moisture content of the high-grade coal produced by the coal modification method during and after transportation or storage are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of coal upgrading, and in particular relates to a coal upgrading method. Background technique [0002] Coal is commonly used as a fuel in many areas of the chemical industry and in other diverse uses, but most of the coal actually used for such purposes is higher grade coal, often referred to as bituminous coal. Low-rank coals such as sub-bituminous coal and lignite account for more than half of all coal types on Earth, and this low-rank coal, due to its high moisture content in the range of 20% to 70%, results in reduced thermal efficiency of the burner and reduced transport efficiency. If stored dry, they tend to reabsorb moisture or ignite spontaneously, and for these reasons they have not been widely used until now. [0003] For wider utilization of such low-rank coals for fuel and chemical purposes, it is necessary to convert them to coals that absorb small amounts of moisture during or after transport...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/08C10B53/00
CPCC10B53/00C10L9/086
Inventor 魏廷锦
Owner 魏廷锦