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Process for dust removing, cooling and tar oil recovering of pyrolysis coal gas

A pyrolysis gas and tar recovery technology, which is applied in gas dust removal, tar processing, petroleum industry, etc., can solve the problems of complicated recovery process, increased processing cost, and difficulty in recovering light oil, so as to simplify the tar recovery process and improve waste heat Effect of recovery efficiency and improvement of tar quality

Active Publication Date: 2013-04-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process adopts two-stage dust removal equipment. Although the dust removal effect is guaranteed, the process is complicated and the processing cost is increased, and the gas at 300-350 ° C is directly cooled in the quenching tower, and the waste heat in the cooling process is not recovered.
The recovery of tar and water in this process is realized by countercurrent washing with coal tar liquid in the gas quenching tower. The recovery process is relatively complicated, and it is difficult to recover some light oil with low condensation point

Method used

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  • Process for dust removing, cooling and tar oil recovering of pyrolysis coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The pyrolysis gas produced by the pyrolysis gasification furnace 1 has an analysis temperature of about 600°C and a dust content of 10g / Nm 3 , water vapor content is 25%, tar content is 108g / Nm 3 ; The pyrolysis gas first enters the superheater 2 and is cooled to about 500°C; then it is dedusted by the high-temperature electric precipitator 3, and the dust removal rate reaches 98%; then the waste heat is recovered through the waste heat recovery boiler 5, and the gas is cooled to At about 60°C, the waste heat recovery efficiency is 88%, and water and tar are condensed and precipitated at the same time; then the gas is passed into the intercooler 6, cooled to 25°C, and water and tar are condensed again; finally, the gas is passed into the electric tar catcher 7 , recycle the tar mist and water mist carried;

[0040] Sampling and analysis of the gas after the process treatment shows that the dust removal rate of pyrolysis gas treated with this process is 98%, the total was...

Embodiment 2

[0042] The pyrolysis gas produced by the pyrolysis gasification furnace 1 has an analysis temperature of about 750°C and a dust content of 8g / Nm 3 , water vapor content is 30%, tar content is 90g / Nm 3 ; The pyrolysis gas first enters the superheater 2 and is cooled to about 600°C; then it passes through the high-temperature filter cartridge dust collector 3 to remove dust, and the dust removal rate reaches 99.5%; Cool to about 80°C, the waste heat recovery efficiency is 87%, and water and tar are condensed and precipitated at the same time; then the gas is passed into the intercooler 6, cooled to 15°C, and water and tar are condensed again; finally, the gas is passed into the electric tar trap Device 7 reclaims the tar mist and water mist it carries;

[0043] Sampling and analysis of the gas after the process treatment shows that the dust removal rate of pyrolysis gas treated with this process is 99.5%, the total waste heat recovery rate is 89.4%, the tar recovery rate is 99....

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Abstract

The invention discloses a process for dust removing, cooling and tar oil recovering of pyrolysis coal gas. The process adopts an overheater, a high-temperature dust remover, an accident quench tower, a waste heat recovering boiler, an indirect cooling device and an electrical tar precipitator which are connected in sequence, and comprises the following steps: pyrolysis coal gas is fed into the overheater to be cooled to 400-700 DEG C, fed into the high-temperature dust remover to be subjected to dust removing, fed into the waste heat recovering boiler to be cooled to 50-100 DEG C and condensed to separate out water and tar oil, fed into the indirect cooling device to be cooled to 10-30 DEG C and further condensed to separate out water and tar oil, and finally fed into the electrical tar precipitator, so that the carried tar oil mist and water mist are recovered. According to the process, dust particles in the coal gas are removed by high-performance dust removing equipment before condensing of tar oil, so as to prevent tar oil and dust separated out through condensation in the coal gas cooling process from being mixed together, improve the quality of tar oil and avoid the problems of equipment blockage and high dust content of tar oil.

Description

technical field [0001] The invention relates to a gas purification process, in particular to a pyrolysis gas dedusting cooling and tar recovery process. Background technique [0002] The pyrolysis gas produced by pyrolysis of volatile-rich coal can be cooled and separated to obtain coal gas and tar. Further deep processing of coal gas and tar can obtain high-quality fuel and chemical products. The semi-coke produced by pyrolysis can be used for combustion Or gasification, so as to realize the graded and quality utilization of coal. Coal pyrolysis technology can reduce the environmental pollution caused by coal burning while increasing the utilization value of coal. It is suitable for a large number of bituminous coal and lignite resources in my country, and has broad application prospects. [0003] The dust removal, waste heat utilization and tar recovery technology of the pyrolysis gas produced by the coal pyrolysis process are the key links of this type of process technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C10K1/02C10K1/04C10C1/00
CPCY02P20/10Y02P20/129
Inventor 王勤辉方梦祥骆仲泱程乐鸣施正伦余春江高翔周劲松倪明江岑可法
Owner ZHEJIANG UNIV
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