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Process for purifying and liquefying coke oven gas

A coke oven gas and process technology, applied in the field of coke oven gas purification and liquefaction, can solve the problems of reducing investment and operating costs, environmental pollution, etc., and achieve the effects of reducing investment and operating costs, increasing corporate profits, and increasing output

Inactive Publication Date: 2011-04-27
姜辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a coke oven gas purification and liquefaction process, which uses the non-condensable combustible gas after liquefaction of coke oven gas to heat the coke oven, realizes the rational utilization of resources, and solves the problems in the existing coke oven gas liquefaction technology. The emission of impurities and environmental pollution caused by combustion and desorption gas; the present invention omits the methanation process, greatly reducing investment and operating costs

Method used

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  • Process for purifying and liquefying coke oven gas
  • Process for purifying and liquefying coke oven gas
  • Process for purifying and liquefying coke oven gas

Examples

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Embodiment 1

[0058]Coke oven gas is separated from gas and liquid to obtain crude gas at 75-95°C, which is cooled to 10-45°C in the primary cooler, and by-products such as condensed ammonia, tar, naphthalene, etc. are discharged; after primary cooling, the gas enters the electric trap, The by-products such as light tar and naphthalene are separated in the device; after the electric trap, the gas enters the debenzene tower, and the benzene and naphthalene in the gas are removed with washing oil, and the washing oil is recycled after distillation and regeneration; the gas after debenzene enters the blower, and the blower The gas is pressurized to 10-40kPa; the gas pressurized by the blower enters the deamination section, and the ammonia in the gas is absorbed by the mother liquor containing sulfuric acid to produce ammonium sulfate; the deamination gas enters the desulfurization section, and the iron oxide powder is used in the desulfurization section Suspension liquid method desulfurization,...

Embodiment 2

[0060] Coke oven gas is separated from gas and liquid to obtain crude gas at 75-95°C, which is cooled to 10-45°C in the primary cooler, and by-products such as condensed ammonia, tar, naphthalene, etc. are discharged; after primary cooling, the gas enters the electric trap, The by-products such as light tar and naphthalene are separated in the device; after the electric trap, the gas enters the debenzene tower, and the benzene and naphthalene in the gas are removed by washing oil, and the washing oil is recycled after distillation and regeneration; the gas after debenzene removal enters the deamination section , use mother liquor containing sulfuric acid to absorb ammonia in the gas to produce ammonium sulfate; after deammonization, the gas enters the desulfurization section. After the compressor is pressurized to 0.2-10MPa, it enters the final desulfurization section. The final desulfurization section uses iron oxide powder suspension liquid method to desulfurize, reducing the...

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Abstract

The invention relates to a process for purifying and liquefying coke oven gas. Raw gas produced by a coke oven is primarily purified, compressed, deeply purified and then separated at a low temperature; a condensed methane ingredient is used as a liquefied natural gas (LNG) product; and uncondensable combustible gas is returned to the coke oven to serve as the gas for heating the coke oven. In the process, the uncondensable combustible gas which is liquefied by the coke oven gas is used for heating the coke oven, so that resources are reasonably utilized, and the problem of environmental pollution caused by impurity discharge and desorption gas combustion in the conventional coke oven gas liquefaction technology is solved; and in the process, a methanation step is saved, and investment cost and operation cost are greatly reduced.

Description

technical field [0001] The invention relates to the field of coke oven gas purification and liquefaction. Background technique [0002] The traditional manufacturing method of liquefied natural gas (LNG) is to produce liquefied natural gas by purifying and liquefying the natural gas extracted naturally in the gas field. At present, the domestic demand is strong and there is a big gap. Article 6 (7) of the Policy stipulates that it is forbidden to use natural gas produced by large and medium-sized gas fields as raw materials to construct LNG projects. Therefore, using coke oven gas as raw material to produce liquefied natural gas has become the first choice for LNG projects. [0003] The process steps for producing liquefied natural gas (LNG) from coke oven gas are as follows: figure 1 Shown: the crude gas from the coke oven is purified to obtain clean gas after preliminary purification, half of which is returned to the coke oven as heating fuel, and the other half is subje...

Claims

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Application Information

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IPC IPC(8): C10K1/00C10K1/32C10L3/10F25J3/00
Inventor 姜辉马科伟
Owner 姜辉
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