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A process for pyrolysis of wet oxidative desulfurization mixed waste liquid in partial oxidation environment

A wet oxidative desulfurization and oxidizing environment technology, which is applied in the petroleum industry, combustible gas purification, chemical instruments and methods, etc., can solve problems such as the price of salt extraction products and the inability to achieve effective treatment of mixed desulfurization waste liquids.

Active Publication Date: 2017-05-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a process for pyrolyzing ammonia-alkali method and sodium-alkali method coking desulfurization waste liquid mixed liquid in a partially oxidized environment, so as to overcome the limitations of the coal blending coking method and high-temperature pyrolysis method in the existing process for the treatment of waste liquid types. The limitations of the salt extraction technology, as well as the problems that the salt extraction product has no market value and the inability to effectively treat the mixed desulfurization waste liquid caused by the salt extraction technology

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  • A process for pyrolysis of wet oxidative desulfurization mixed waste liquid in partial oxidation environment
  • A process for pyrolysis of wet oxidative desulfurization mixed waste liquid in partial oxidation environment

Examples

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Effect test

Embodiment example 1

[0048] The desulfurization waste liquid used in this implementation case is a mixture of two desulfurization waste liquids produced by the wet desulfurization of the coking plant using the sodium-alkali method and the ammonium-alkali method. Take 500mL of the desulfurization waste liquid for the experiment. Among them, the content of sodium thiosulfate is about 13.51g, the content of sodium thiocyanate is about 13.67g, the content of ammonium thiosulfate is about 18.10g, the content of ammonium thiocyanate is about 20.15g, the content of suspended sulfur is 1.41g, and the content of CODcr is 65.38 g.

[0049] In the first step, 500mL of desulfurization waste liquid is filtered through rapid quantitative filter paper to obtain 5.41g of filtrate;

[0050] The second step is to evaporate and preheat the above filtrate. The heat source is saturated steam from the waste heat boiler. The vacuum degree of evaporation is 0.057MPa to obtain 250mL of 85°C concentrated liquid; the genera...

Embodiment example 2

[0056] The desulfurization waste liquid used in this implementation case is a mixture of two desulfurization waste liquids produced by the wet desulfurization of the coking plant using the sodium-alkali method and the ammonium-alkali method. Take 500mL of the desulfurization waste liquid for the experiment. Wherein the sodium thiosulfate content is about 13.51g, the sodium thiocyanate content is about 13.67g, the ammonium thiosulfate content is about 18.10g, the ammonium thiocyanate content is about 20.15g, and the suspended sulfur is 1.41g.

[0057] In the first step, 500mL of desulfurization waste liquid is filtered through rapid quantitative filter paper to obtain 5.39g of filtrate;

[0058] The second step is to evaporate and preheat the above filtrate. The heat source is the high-temperature pyrolysis gas from the pyrolysis reactor. The pyrolysis gas enters the preheater from the bottom of the evaporation preheater to perform direct contact heat exchange with the desulfuri...

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Abstract

The invention discloses a method used for pyrolyzing wet oxidation desulfurization mixed waste liquid in partial oxidation environment. According to the method, a desulfurization waste liquid mixture obtained via ammonia alkaline method and sodium alkali method is filtered; an obtained filtrate is subjected to reduced pressure vaporization preheating, a desulfurization waste liquid concentrated solution obtained via vaporization is subjected to pressurization, is subjected to atomization using a three-channel combined pressure atomization nozzle, and then is delivered into a pyrolysis reactor together with hydrogen-rich gas, such as coal gas, and oxygen for pyrolysis; pyrolysis gas obtained via pyrolysis is subjected to vaporization preheating of desulfurization waste liquid via a direct method or an indirect method; pyrolyzed molten salt obtained via pyrolysis is discharged via the bottom of the pyrolysis reactor, is cooled using a cooling system, and then is recycled back to a desulfurization workshop section to provide alkali sources. The method is simple; operation is continuous and stable; application range is wide; desulfurization waste liquid obtained via ammonia alkaline method and sodium alkali method, and a mixture of desulfurization waste liquid obtained via ammonia alkaline method and sodium alkali method can be processed effectively; all-component harmless treatment of waste liquid is realized, and problems that mixed waste liquid is difficult to process, processing processes are complicated, and application range is limited, are solved completely.

Description

technical field [0001] The invention relates to a process for treating coking desulfurization waste liquid, in particular to a harmless treatment process for pyrolysis ammonia-alkali method and sodium-alkali method desulfurization mixed waste liquid in a partially oxidized environment. Background technique [0002] The rapid development of my country's coking industry has become the world's largest producer of coke. In 2014, China's coke output was 476.9 million tons, and the coke oven gas produced in the coking process has become a large-tonnage energy and chemical raw material. During the coking process, about 30% to 35% of the sulfur in the raw coal is converted into H 2 S and other sulfides, and NH 3 Together with HCN, etc., it forms impurities in the gas. If the gas does not remove hydrogen sulfide and hydrogen cyanide, it will seriously corrode the equipment during the transportation process; as a civil fuel, it will pollute the environment and damage human health; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C10K1/08C10K1/12C02F103/18
CPCY02P20/129
Inventor 张永发张舒婷李国强王宏宇李振华李涛李超
Owner TAIYUAN UNIV OF TECH
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