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Technology for removing tar from raw gas containing coal tar

A technology of coal tar and crude gas, which is applied in the field of gas purification technology, can solve the problems of increasing enterprise investment and production costs, unfavorable environmental protection, etc., and achieve the effects of reducing production costs, saving production and operation costs, and reducing investment

Active Publication Date: 2013-03-13
WUHUAN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the above process that in order to treat the process wastewater generated in the process of gas purification, a series of complex wastewater treatment devices need to be added, which not only increases the investment and production costs of the enterprise, but is also not conducive to environmental protection.

Method used

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  • Technology for removing tar from raw gas containing coal tar
  • Technology for removing tar from raw gas containing coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Embodiment: take the raw gas that low-temperature coking process produces as example, with reference to figure 1 , the tar-containing crude gas (about 361°C) produced in the low-temperature coking process enters the quenching tower 1, and is in countercurrent contact with the coal tar (about 71°C) circulating from the cooler 3, and the tar-containing crude gas is washed and cooled to 76-78 ℃ (in the present embodiment, the calculated dew point temperature is 73 ℃), wherein most of the coal tar dissolves in the coal tar that is circulated and sinks into the bottom of the quenching tower 1, and the crude gas after the initial tar removal is cooled by the quenching tower 1 The top of the tower enters the electric tar catcher 4, where almost all the coal tar in the crude gas is captured, and the captured coal tar flows back to the bottom of the quenching tower 1, and the crude gas from the electric tar catcher 4 is sent downstream Process: After the bottom of the chilling ...

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Abstract

The invention discloses a technology for removing tar from raw gas containing coal tar, solving the problems of wastewater generation, environment pollution and high cost of equipment investment and production operation in the current technology for removing tar. The technical scheme adopted by the invention is as follows: firstly, feeding the raw gas containing coal tar in a chilling tower to contact with coal tar from a cooler in a countercurrent manner for washing and cooling, enabling the raw gas after tar removing and cooling to enter in an electrical tar precipitator, precipitating the coal tar once again and feeding to the downstream procedure; and transmitting the coal tar at the bottom of the chilling tower in the cooler for cooling by a circulating pump, and feeding in the chilling tower for recycling. The invention has the advantages of simple technology, no consumption of fresh water, no generation of wastewater, and capability of producing coal tar byproducts, and has wide market application prospect.

Description

technical field [0001] The invention relates to a gas purification process in the chemical industry, in particular to a tar removal process for crude gas containing coal tar. Background technique [0002] The crude gas produced by coal gasification (fixed layer gasification) and coking process usually contains some coal tar. Washing and cooling the crude gas, washing gas water and gas condensate are mixed to form a large amount of waste water containing impurities such as tar, phenol, ammonia, etc. Before the waste water is discharged, the oil, phenol, ammonia, etc. in the water must be separated and recovered to achieve Influent requirements for general wastewater treatment methods. [0003] Taking the Lurgi fixed bed gasification process as an example, the coal-tar-containing crude gas (about 650°C) produced by the gasifier first enters the Venturi scrubber cooler to be washed by high-pressure jet water, dust is removed, and the temperature is lowered. Cool to 200°C, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00C10K1/18
Inventor 游伟章卫星赵涛胡四斌夏吴
Owner WUHUAN ENG
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