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Method for processing waste lye generated in olefin separating unit alkali washing system

A technology for separation and treatment of olefins, which is applied in the field of separation of mixed olefins in the coal chemical industry. It can solve problems such as failure to deliver normally, blockage of lye delivery pipelines, and nozzles of incinerators, etc., to ensure long-term operation, shorten residence time, and solve blockages. Effects of transfer pumps and lines

Active Publication Date: 2016-06-15
CHINA SHENHUA ENERGY CO LTD +2
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a treatment method for the waste lye produced in the alkali cleaning system of the olefin separation device, so as to solve the technical problem in the prior art that the lye delivery pipeline and the nozzle of the incinerator are seriously blocked and cannot be delivered normally

Method used

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  • Method for processing waste lye generated in olefin separating unit alkali washing system

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Embodiment 1

[0024] According to the liquid level / interface calculation formula Control the boundary position of the alkali washing tower kettle and the butter side liquid level in the alkali washing system of the olefin separation unit, where F is the buoyancy of the medium, D is the diameter of the inner cylinder, and H is the length of the inner cylinder; ρ is the density of the medium or the density difference between the two media, When ρ is the density of butter, the liquid level on the butter side is calculated, and when ρ is the density difference between the spent lye and butter, the boundary position of the cauldron of the alkali washing tower is calculated.

[0025] After a large number of sampling measurements and statistics, the technicians determined the density of waste lye at 1148kg / m 3 . The density of butter in the design is based on the density of butter in the traditional ethylene industry. In the coal chemical plant, due to the high content of oxides in the product g...

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Abstract

The invention discloses a method for processing waste lye generated in an olefin separating unit alkali washing system. The method includes the following steps that the waste lye is directly conveyed to a waste lye incinerator from the olefin separating unit alkali washing system, and an alkali washing tower kettle interface level and a butter side liquid level in the olefin separating unit alkali washing system are controlled according to a liquid level / interface level computational formula (please see the computational formula in the specification), wherein F is medium buoyancy force, D is the diameter of an inner barrel, and H is the length of the inner barrel; and rho is the medium density or a density difference of two media, when the rho is the density of butter, the butter side liquid level is obtained through computation, and when the rho is the density difference of the waste lye and the butter, the alkali washing tower kettle interface level is obtained through computation. By means of the technical scheme, the alkali washing tower kettle interface level and the butter side liquid level can be effectively controlled without improving original equipment. A technological process of directly feeding the waste lye to the incinerator is adopted, the stay time of the butter in a waste lye conveying system is shortened, the problem that a conveying pump and a pipe are blocked by the butter is solved, and long-period running of the device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of separation of mixed olefins in the coal chemical industry, in particular to a method for treating waste lye produced in an alkali cleaning system of an olefin separation device. Background technique [0002] Shenhua Baotou Coal-to-Olefins Project is the world's first large-scale coal chemical project using methanol-to-olefins (DMTO) technology, using coal as raw material, with an annual output of 600,000 tons of polyethylene and polypropylene products. Among them, the methanol-to-olefins and olefins separation units play a central role in connecting the past and the future, and are the key devices for the success of the coal-to-olefins project. Methanol is converted into product gas including ethylene, propylene and mixed C4, C5 and other hydrocarbons through the methanol-to-olefins unit, and then enters the olefins separation unit for product separation. The product gas from the methanol-to-olefins unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/04
CPCF23G7/04F23G2209/101
Inventor 贾金秋孙东东
Owner CHINA SHENHUA ENERGY CO LTD
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