System for producing natural gas from coke oven gas

Abstract

The invention relates to the field of comprehensive utilization of coke oven gas, in particular to a system for producing natural gas from coke oven gas. The system comprises a compressor, wherein the compressor is connected with a temperature swing adsorption device through a pipeline, the temperature swing adsorption device is connected with a first pressure swing adsorption device through a pipeline, the first pressure swing adsorption device is connected with a second pressure swing adsorption device through a pipeline, and the second pressure swing adsorption device is connected with a first vacuum pump through a pipeline; the first pressure swing adsorption device is connected with a second vacuum pump through a pipeline. The temperature swing adsorption device, the second pressure swing adsorption device and the second vacuum pump are connected with a power generating boiler through pipelines. Residual gas after extraction of natural gas is not treated further and used for generating power, the coke oven gas is treated with the pressure swing adsorption method for extraction of the natural gas, and the total energy consumption of the device is low.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of coke oven gas, in particular to a system for producing natural gas from coke oven gas. Background technique [0002] Most existing steel mills will be equipped with a coking plant, which produces coke for the ironmaking process of the steel mill, and a large amount of coke oven gas will be produced during the coking process of the coking plant. At the same time, many processes in steel mills (such as hot rolling, cold rolling, and heat treatment) need to use natural gas with high calorific value. [0003] In the prior art, the coke oven gas produced in the coking plant is generally used to heat the boiler to generate steam, and the steam drives the steam turbine generating set to generate electricity. Because heat treatment and other processes have high requirements on the calorific value of gas, natural gas is purchased from outside for heat treatment. The invention patent "Method fo...

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Problems solved by technology

The invention patent "Method for Extracting Methane from Coke Oven Gas by Membrane Separation and Low-Temperature Rectification" (CN 101747132) is an advanced treatment method for coke oven gas, which uses membrane separation technology and low-temperature rectification technology to extract methane, which requires a large investment , high energy consumption, and its product is liquefied natural gas

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