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Sulfur nitrogen harmful elements in coal orientated transformation additive and its application method

A kind of harmful element, directional transformation technology, used in fuel additives, petroleum industry, fuel and other directions, can solve the problem of secondary release of polluted gas, large amount of waste residue, single removal of sulfur fixation efficiency and other problems

Inactive Publication Date: 2005-06-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the single removal of sulfur and nitrogen harmful elements in coal, the low efficiency of sulfur fixation, excessive waste residue, and secondary pollution of gas during the conversion process of existing coal sulfur and nitrogen harmful elements. In view of the shortcomings of release, look for an additive mixture with low cost and wide sources. The synergistic effect between several components of the mixture can inhibit the pyrolysis of solids formed by the removal of sulfur and nitrogen and promote the acceptance of nitrides to the environment. The characteristics of nitrogen conversion without changing the conventional reaction conditions of coal gasification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: In the reaction system for coal gasification that does not contain water vapor in the reaction atmosphere, the additive Ca / S ratio is controlled at 2.5:1. First, limestone or dolomite is crushed to a particle size of 0.25-1.00mm, and then iron and silicon are added. and a regulatory compound depending on the ash content of the coal sample itself, the amount of which is based on Ca, and the ratios of Fe / Ca and Si / Ca are 0.8:1 and 0.3:1 respectively. It is uniformly blended with the coal sample, and used as a coal sample for gasification. The gasification of coal is carried out in an atmosphere without water vapor, and the oxidation is carried out at 800-900 ° C before the gasification residue is discharged and the temperature is not cooled.

Embodiment 2

[0017] Example 2: For the steam gasification reaction system, the amount of additives can be appropriately reduced, the Ca / S ratio is controlled at 1:1, and limestone with a lower thermal decomposition temperature (or limestone containing a small amount of dolomite) is selected to be pulverized to 0.25 -1.00mm particle size, use 5% NaCl aqueous solution to soak it overnight, add iron, silicon and a kind of compound for adjusting acidity and alkalinity depending on the ash content of the coal sample itself after drying, and its content is based on Ca , the Fe / Ca, Si / Ca ratios are 0.5:1, 0.2:1 respectively, and the uniformly mixed additive compound is blended with the coal sample as a coal sample for gasification, and the gasification of coal in a steam atmosphere is carried out. Sulfur and part of nitrogen in chemical residues can form a compound with unknown structure with additives, and the compound has good stability and can be discharged directly.

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Abstract

An additive for directionally transforming the harmful elements (S and N) in coal is a mixture of Ca-contained compound, Fe and Na contained compound with modifying function, SiO2 and others. It can change the route of oxidizing the precursors of SOx and NOx to make it toward harmless direction. Its application method is mixing it with coal before gasifying.

Description

1. Technical field [0001] The invention discloses an additive for directional conversion of sulfur and nitrogen harmful elements in coal and a use method thereof, belonging to the research fields of environmental protection and clean conversion of coal. 2. Background technology [0002] The mass production and use of coal, on the one hand, promotes economic development, and on the other hand, poses severe challenges to the environment. Therefore, the supply and demand of energy and the protection of the environment have become two interrelated and contradictory issues faced by energy workers, and the harm caused by energy use to the environment has also become the core of our country's environmental problems. Among the main organic matter elements carbon, hydrogen, oxygen, nitrogen, and sulfur that make up coal, sulfur and nitrogen are considered to be the main harmful sources that can cause air pollution. Atmospheric NO x and SO 2 It not only affects human health and des...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L10/00
Inventor 谢克昌常丽萍赵炜冯杰
Owner TAIYUAN UNIV OF TECH
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