Method of producing natural gas by coupling coke oven gas and producer gas and production device

Abstract

The invention relates to a method of producing natural gas by coupling coke oven gas and producer gas and a production device adopting the method for production of the natural gas. According to the method, the coke oven gas and the producer gas are adopted as raw materials; the ratio of the coke oven gas to the producer gas is calculated based on requirements on the ratio of H2, CO, and CO2 for methanation and according to the contents of the H2, the CO and the CO2 in the coke oven gas and the producer gas which are adopted as the raw materials; the coke oven gas and the producer gas which are adopted as the raw materials are fed into a methanation device according to the ratio and subjected to methanation; and nitrogen in the gas after the methanation is removed to form the natural gas formed by methane. The production device comprises the methanation device and a nitrogen separation device which are connected to each other. The method and the production device effectively utilize the component difference of the two raw material gases, achieve component complementation of the two kinds of coal gas and allow the gas after the methanation to meet requirements on the natural gas, thus simplifying the production process, reducing the production cost, avoiding environment pollution and increasing economic benefit.

Description

technical field [0001] The invention relates to the production of natural gas, in particular to a method for producing natural gas by coupling coke oven gas and producer gas and a production device for producing natural gas by using the method. Background technique [0002] Coke oven gas is a by-product of the coking industry in the process of generating coke. Coking coal is heated to about 1000°C for high-temperature dry distillation under air-isolated conditions, and coke, coke oven gas and other coking chemical products are produced through thermal decomposition and coking. The purified gas is a medium calorific value gas with a calorific value of 17500kJ / Nm 3 About 300-400 m3 of coking gas per ton of coal 3 , accounts for about 16%-20% of the coal mass in the furnace, and its main components are hydrogen and methane, which can separate hydrogen for chemical synthesis and methane to replace natural gas, but the process of preparing hydrogen and natural gas through separa...

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Problems solved by technology

[0003] In order to improve the utilization value of coke oven gas, people have also proposed a way to prepare coke oven gas into natural gas (artificial natural gas) composed of methane through methanation treatment technology. The main function of methanation is to convert carbon monoxide and Dioxide is reduced to methane by hydrogen. Due to the high hydrogen content in coking gas, there is still a large amount of hydrogen in the gas after the methanation process, and hydrogen separation is still required. Therefore, not only the process is still relatively complicated, but The production cost is high, and the economic benefit of the by-product hydrogen is not ideal, which affects the popularization and utilization of this technology in practice

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