Quenching type methanation process with heat removing internally

Abstract

The invention relates to a quenching type methanation process with heat removing internally, and belongs to the field of methanation process of H2, CO and CO2 gas. The methanation process comprises the following steps: after deep purification of feed gas, the feed gas is divided into two parts; a first part and water vapour are mixed and heated, and enter into the upper part of a methanation reactor, and high temperature methane-rich gas is produced after production reaction; a second part of the feed gas enters into the middle part of the reactor, and the part of feed gas mixes and quenches the high temperature methane-rich gas; the quenched mixed gas enters the lower part of the reactor for a methanation reaction, and a methanated product methane-rich gas is obtained. The feed gas is divided into two part, and a quenching segment is additionally installed in the middle, heat from the methanation reaction of the first part of the feed gas heats the second part of the gas, so that amount of the feed gas which needs preheating in the first part is effectively reduced, preheaters are reduced, and apparatus cost is reduced. The methanation process has the advantages of good controllability, a small amount of heat exchangers, low investment of the whole methanation equipment, small land occupation area, and low production cost, and recycle gas is not needed.

Description

technical field

[0001] The invention belongs to H 2 , CO and CO 2 The gas methanation process field is specifically a cold-shock internal transfer heat methanation process. Background technique

[0002] my country is the world's largest coke producer, with a total production capacity of more than 450 million tons. According to the statistics of the China Coking Association, there are more than 2,000 large, medium and small coking enterprises in the country (over 900 large-scale coking enterprises), of which 1 / 3 of the production capacity is in the iron and steel complex (coke oven gas is mainly used as fuel or smelting reducing agent), 2 / 3 of the production capacity is in independent coking enterprises. In 2014, the coke output was 477 million tons, accounting for more than 60% of the global total output. At the same time, the by-products are rich in CO and CO 2 、H 2 and CH 4 Coke oven gas and other gases. According to the by-product of about 400Nm per ton of coke 3 ...

Images