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

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

Inactive Publication Date: 2003-12-03
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 without water vapor in the reaction atmosphere, the additive Ca / S ratio is controlled at 2.5:1. First, the limestone or dolomite is pulverized to a particle size of 0.25-1.00 mm, and then iron and silicon are added. And an adjusting compound that depends on the ash content of the coal sample. The addition amount is based on Ca. The ratios of Fe / Ca and Si / Ca are 0.8:1 and 0.3:1 respectively. The uniformly mixed additive compound It is uniformly blended with the coal sample and used as the coal sample for gasification. The coal is gasified in a non-water vapor atmosphere, and the gasification residue is oxidized at 800-900°C before the temperature is not cooled before the gasification residue is discharged.

Embodiment 2

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

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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 additive for the directional conversion of sulfur and nitrogen harmful elements in the coal and the use method of the present invention belong to the research fields of environmental protection and clean coal conversion. 2. Background technology [0002] The mass production and use of coal has promoted economic development on the one hand, and on the other hand, it has also posed severe challenges to the environment. Therefore, the issue of energy supply and demand and the issue of environmental protection have become two related and contradictory issues facing energy workers. The harm caused by energy use to the environment has also become the core of my country's environmental problems. Among the main organic elements that make up coal, carbon, hydrogen, oxygen, nitrogen, and sulfur, sulfur and nitrogen are considered to be the main harmful sources that can cause air pollution. NO in the atmosphere x And SO 2 It not only affects human health and de...

Claims

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Application Information

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Patent Type & Authority Applications(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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