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Method for suppressing release of SO2 and NO in high-temperature reaction of coal

A high-temperature reaction and reaction technology, applied in the field of clean coal, can solve the problems of complex combustion and post-treatment devices, difficulty in large-scale application and promotion, and unsatisfactory inhibition, so as to reduce environmental pollution, reduce sulfur content, and reduce release volume effect

Active Publication Date: 2019-10-18
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to overcome SO in the prior art to reduce the SO after burning coal 2 and NO emission concentration methods for SO 2 The suppression effect of CO and NO emissions is not ideal, and usually requires complicated combustion and post-treatment devices, high economic costs, and difficult to apply and promote on a large scale. 2 and NO release method, by modifying and doping coal, and adopting effective combustion methods, effectively reducing SO 2 and NO release, and the method is simple and convenient, short time-consuming, easy to add, and achievable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Crush the raw coal into coal powder with a particle size of 40 μm; disperse the coal powder in water, stir evenly, add metal Zn with a mass ratio of 1:23 to the coal powder, add hydrochloric acid to make the solution pH=4, and react at 40°C for 35 minutes; After the end, the temperature was raised to 250°C, and a mixed solution of N,N-diethanol dodecamide, water and isopropanol was added, and the reaction was stirred for 15 minutes, wherein the mass fraction of N,N-diethanol dodecamide was 0.05%, N, The mass ratio of N-diethanol lauramide to coal powder is 1:2500, and the volume ratio of water to isopropanol is 3:1; then add C heavy oil with a mass ratio of coal powder of 1:5, and continue the reaction for 15 minutes Filter and air-dry, and obtain granulated coal after deoiling with polybutane; disperse the granulated coal in water to obtain a coal slurry with a concentration of 15wt%, put it in a flotation machine, and add the mass ratio of granulated coal to 150g:1t T...

Embodiment 2

[0044] Crush the raw coal into coal powder with a particle size of 40 μm; disperse the coal powder in water, stir evenly, add metal Zn with a mass ratio of 1:23 to the coal powder, add hydrochloric acid to make the solution pH=4, and react at 40°C for 35 minutes; After the end, the temperature was raised to 250°C, and a mixed solution of N,N-diethanol dodecamide, water and isopropanol was added, and the reaction was stirred for 15 minutes, wherein the mass fraction of N,N-diethanol dodecamide was 0.05%, N, The mass ratio of N-diethanol lauramide to coal powder is 1:2500, and the volume ratio of water to isopropanol is 3:1; then add C heavy oil with a mass ratio of coal powder of 1:5, and continue the reaction for 15 minutes Filter and air-dry, and obtain granulated coal after deoiling with polybutane; disperse the granulated coal in water to obtain a coal slurry with a concentration of 15wt%, put it in a flotation machine, and add the mass ratio of granulated coal to 150g:1t T...

Embodiment 3

[0047] Crush the raw coal into coal powder with a particle size of 20 μm; disperse the coal powder in water, stir evenly, add metal Zn with a mass ratio of 1:20 to the coal powder, add hydrochloric acid to make the solution pH=3, and react at 35°C for 40 minutes; After the end, the temperature was raised to 200°C, and a mixed solution of N,N-diethanol dodecamide, water and isopropanol was added, and the reaction was stirred for 10 minutes, wherein the mass fraction of N,N-diethanol dodecamide was 0.04%, N, The mass ratio of N-diethanol lauramide to coal powder is 1:2400, and the volume ratio of water to isopropanol is 1:1; then add C heavy oil with a mass ratio of 1:4 to coal powder, and continue the reaction for 10 minutes Filter and air-dry, and obtain granulated coal after deoiling with polybutane; disperse the granulated coal in water to obtain a coal slurry with a concentration of 10wt%, put it in a flotation machine, and add the mass ratio of granulated coal to 140g:1t T...

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Abstract

The invention relates to the technical field of clean coal, and discloses a method for suppressing the release of SO2 and NO in a high-temperature reaction of coal. The method comprises the steps: crushing raw coal into coal powder, dispersing the coal powder into water, and adding metal Zn and hydrochloric acid for a reaction; after completion of the reaction, carrying out heating to 200 to 300 DEG C, adding N,N-diethanol dodecylamide and a mixed solution of water and isopropanol, and carrying out a reaction under stirring; then adding heavy oil C, continuing a reaction, carrying out filtering and air-drying, and carrying out deoiling with polybutane so as to obtain granulation coal; dispersing the granulation coal into water, adding GF oil, introducing nitrogen for flotation, and carrying out washing and drying so as to obtain clean coal; and mixing the clean coal with calcium acetate and / or calcium hydroxide, carrying out drying, and carrying out a high-temperature reaction in a CO2atmosphere at 950 to 1050 DEG C. According to the invention, the coal powder is subjected to electrochemical flotation desulfurization; calcium acetate and / or calcium hydroxide are doped; the high-temperature reaction is performed in the CO2 atmosphere; thus, the release amounts of the SO2 and the NO after the reaction can be effectively reduced; and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of clean coal, in particular to a method for suppressing SO in coal high-temperature reaction 2 and NO release methods. Background technique [0002] Coal is a commonly used fuel, because the exhaust gas produced by coal combustion contains SO 2 A variety of harmful gases and smoke such as NO and NO will pollute the environment, so the research on how to reduce the generation of harmful gases is of great significance. In the prior art, it is generally used to improve the combustion method or further denitrify the flue gas after combustion to reduce the SO after coal combustion. 2 and NO emissions, for example, "a kind of anthracite coal-burning method and coal-fired furnace for suppressing nitrogen oxides" disclosed in the Chinese patent literature, its announcement number CN1038446C, its main points are that the coal seam is divided into preheating carbonization zone and In the primary combustion zone, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/00C10L9/02C10L9/10C10L9/08
CPCC10L9/00C10L9/02C10L9/08C10L9/10
Inventor 顾颖陈宇凡张艳
Owner ZHEJIANG OCEAN UNIV
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