Gas-making process of water vapour replaced or partially replaced by carbonic anhydride

Abstract

The invention discloses a method for making gases by using carbon dioxide to replace or partially replace steam. In the method, the heat supply is provided by air blowing, and carbon dioxide is used as a gasificaton agent; gases with rich carbon monoxide are made by a prior fixed bed gasifier or YH fine-coal briquetting continuous gasifier; carbon dioxide can be supplied from the vent gases with rich carbon dioxide in any work section of the synthetic ammonia production; a carbon dioxide buffer tank and a steam buffer tank adopted in the method can be connected in parallel or in series. The method of the invention fully utilizes available resources, saves energy, reduces energy consumption and simultaneously improves the utilization efficiency of steam, thereby lowering steam costs.

Description

Method of replacing or partially replacing water vapor with carbon dioxide to make gas Technical field The invention relates to a coal gasification process in the field of coal chemical industry, in particular to a method for preparing gas by using carbon dioxide as a gasification agent. technical background Coal gasification technology mostly uses the reaction of carbon and various gaseous reactants to generate gas with combustible components, namely coal gas. Domestic gasification agents mostly use water vapor, oxygen or air, while foreign countries use pure carbon dioxide and pure O2 as gasification agents and coke to produce high-purity carbon monoxide gas. In recent years, domestic research on coal gasification technology using carbon dioxide as a gasification agent to produce carbon monoxide has also begun. A fluidized bed carbon monoxide gasifier gasification process and its device use O2 and carbon dioxide as gasification agents or use air and Carbon dioxide is used as a...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: O2 in the air reacts with carbon and reacts completely or incompletely to form carbon dioxide and carbon monoxide, and the carbon dioxide produced continues to react with carbon, and the produced carbon monoxide also reacts with O2, thus generating many side reactions , thus affecting the content of effective components in the gas

However, completely using carbon dioxide instead of water steam to produce gas will also have a disadvantage: if the amount of carbon dioxide is not properly controlled, it will cause waste of resources, and carbon dioxide itself does not burn, nor does it support combustion. It does not have the effect of adjusting the temperature in the furnace, but reduces the temperature in the furnace, resulting in a decrease in product gas

The above-mentioned method of producing high-purity carbon monoxide product gas with carbon dioxide as a gasification agent obviously does not make full use of existing resources