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Low-rank coal dry distillation gas separation device and process

A separation device and dry distillation gas technology, which is applied in the petroleum industry, combustible gas purification, combustible gas purification/transformation, etc., can solve the problems of difficult treatment, high pollution of coal chemical wastewater, etc., and reduce equipment investment and management costs and ease treatment Difficulty, downsizing effects

Active Publication Date: 2022-04-26
QINGDAO JUNYANG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and propose a low-rank coal dry distillation gas separation device and process. Separation greatly reduces the content of organic matter in wastewater, thereby reducing the difficulty of wastewater treatment and solving the problem of high pollution and difficult treatment of coal chemical wastewater in the existing production process

Method used

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  • Low-rank coal dry distillation gas separation device and process

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Effect test

Embodiment 1

[0034] As provided in accordance with the present invention such as Figure 1 The process equipment flow chart shown is separated and processed, including the following steps:

[0035] (1) Graded condensation: the initial temperature of coal dry distillate gas is 300 °C, divided into two strands, one is entered from the bottom of the tower after heat exchange with the kettle liquid, and the other is entered into the graded condensing tower 1 from the bottom of the tower after recovering heat from the waste heat boiler; the top feed of the graded condensing tower 1 is a mixture of various organic matter separated from the dry distillate gas and can be azerohydrated with water as an entrainment agent; after long-term operation, the toluene content in the entrainment agent is measured to be about 82%, benzene 14%; the gas extracted from the gas phase at the top of the grading condensing tower 1. The mixture of water vapor and entrainment agent enters the secondary condenser 2 for secon...

Embodiment 2

[0041] As provided in accordance with the present invention such as Figure 1 The process equipment flow chart shown is separated and processed, including the following steps:

[0042] (1) Graded condensation: the initial temperature of the coal dry distillate gas is 480 °C, divided into two strands, one is entered from the bottom of the tower after heat exchange with the kettle liquid, and the other one enters the waste heat boiler to recover heat from the bottom of the tower and also enters the grading condensing tower 1; the top feed of the graded condensing tower 1 is a mixture of various organic matter that can be azerohydrized with water separated from the distillate gas, as an entrainment agent; after long-term stable operation, the toluene content in the entrainment agent is measured to be about 80%, benzene is 15%; the gas extracted from the gas phase at the top of the grading condensing tower 1 is gaseous. The mixture of water vapor and entrainment agent enters the secon...

Embodiment 3

[0048] As provided in accordance with the present invention such as Figure 1 The process equipment flow chart shown is separated and processed, including the following steps:

[0049] (1) Graded condensation: The initial temperature of coal dry distillate gas is 650 ° C, divided into two strands, one is entered from the bottom of the tower after heat exchange with the kettle liquid, and the other is entered into the graded condensing tower 1 from the bottom of the tower after recovering heat from the waste heat boiler; the top feed of the graded condensing tower 1 is a mixture of various organic matter that can be azeroze with water separated from the distillate gas, as an entrainment agent; after long-term stable operation, the toluene content in the entrainment agent is measured to be about 83%, benzene 13%; the gas extracted from the top gas phase of the grading condensing tower 1. The mixture of water vapor and entrainment agent enters the secondary condenser 2 for secondary ...

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Abstract

The invention belongs to the technical field of coal processing and treatment, and particularly relates to a low-rank coal dry distillation gas separation device and process, the separation device comprises a fractional condensing tower, a secondary fractional condenser, a three-phase separator, a washing tower and an entrainer circulating tank; the fractional condensing tower is sequentially connected with a secondary fractional condenser, a three-phase separator and a washing tower; the three-phase separator is connected with an entrainer circulating tank; the entrainer circulating tank is connected with the fractional condensing tower; and the fractional condensing tower is also directly connected with the washing tower. The separation process adopts the steps of fractional condensation, secondary condensation, three-phase separation and coal gas washing, so that segregation and condensation of the retorting gas are innovatively realized, water is separated from organic matters such as phenols at the front end, water and most coal tar are separated in a condensation section, the content of organic matters in wastewater is greatly reduced, and the energy consumption is reduced. Therefore, the treatment difficulty of the wastewater is reduced, and'source treatment 'of the wastewater is realized. The device is simple, and the equipment investment and the management cost can be greatly reduced.

Description

Technical field [0001] The present invention belongs to the field of coal processing technology, specifically relates to a low-grade coal distillate gas separation device and process. Background [0002] Low-grade coal belongs to a category of coal, is a low degree of coal, China's coal resources are abundant, of which low-grade coal accounted for more than 50%, so it is of great significance to efficiently and cleanly use low-grade coal. The conversion and utilization of low-grade coal by fixed bed gasification and pyrolysis process with dry distillation section is a cost-effective method, which is highly thermally efficient and can obtain high-value chemicals such as phenol, nephroidine, pyridine and coal tar. In the above production process, there is a dry distillation process, the gaseous products of the dry distillation process (dry distillate) consists of water vapor, coal gas and coal tar, which coal tar contains phenols, benzene, toluene, xylene, naphthalene, anthracene,...

Claims

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Application Information

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IPC IPC(8): C10K1/04C10K1/16
CPCC10K1/04C10K1/046C10K1/16
Inventor 盖恒军王振东朱全红朱艳红
Owner QINGDAO JUNYANG CHEM TECH