Technique for joint production of methanol and natural gas with methyl hydride containing synthesis gas

Abstract

The invention belongs to the technology field of coal gasification comprehensive utilization and provides particularly a technique for preparing methanol and natural gas from methane-containing synthetic gas. The technique can overcome the shortcomings of a processing scheme of methanol in synthetic gas in the prior art; and the technique comprises the following steps: methane-containing synthetic gas is pressurized and then mixed with recycle gas from a methanol synthetic tower to synthesize methanol; the methanol-containing gas from the methanol synthetic tower is heat-exchanged with the gas mixture fed into the tower and cooled, and methanol is separated; a part of the methanol-separated gas as purged gas is introduced into a methane synthesizing device, and the other part is introduced into the methanol synthetic tower to continuously react to obtain natural gas after it is pressurized via circulator, recycled and then mixed with the methane-containing synthetic gas. The technique combines synthesis of methanol of high CH4 inert gas and production of natural gas by re-synthesizing methane from purged gas obtained from methanol synthesis. With the technique, two synthesis pressures and heat energy utilization can be combined together; thus making full use of the material and achieving the purposes of saved investment, energy and consumption and good benefit.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of coal gasification, in particular to a technology for co-producing methanol and natural gas from methane-containing synthesis gas. Background technique [0002] At present, 4.0MPa(a) pure oxygen pressurized moving bed solid-state ash coal gasification, for highly volatile coal, the synthesis gas after crude gas purification contains 16-17% methane, accounting for 40% of the calorific value of the gas. Pure oxygen moving bed liquid slagging coal gasification, CH in the purified syngas 4 The content is 14-15%, accounting for about 37% of the calorific value of gas. 3MPa pure oxygen fluidized bed pressurized coal gasification, CH in the purified syngas 4 The content is 8-9%, accounting for 25% of the calorific value of gas. Coal indirect liquefaction to synthetic oil, tail gas contains CH 4 42%, accounting for 70% of the calorific value of gas. CH in coke oven gas 4 The cont...

AI Technical Summary

Problems solved by technology

Option 1 has been proved by factory practice that its process is complicated, the process is long, the power consumption of raw materials is high, and the product cost is high, so it is not suitable for selection

Option 2: The factory under construction proves that the investment is large, the power consumption is large, and the benefit impact is large

Images