| 摘要 |
<p>The present invention relates to a method for producing coal gas, including: feeding raw material pulverized coal and a high temperature gasification agent (7) into a coal gas producer (a) for reaction to produce coal gas; performing heat exchange between the coal gas coming out of the coal gas producer and a gasification agent to produce the high temperature gasification agent (7); performing heat exchange between the coal gas, after performing heat exchange with the gasification agent, and water to produce vapor (4), wherein the vapor (4) is a component of the gasification agent; and outputting the coal gas after further dust removal and desulfuration which has performed heat exchange with the water. Before performing heat exchange between the coal gas coming out of the coal gas producer and the gasification agent, a dry high temperature separation processing is performed and the separated pulverized coal (2) is sent back to the coal gas producer (a). After production of the high temperature gasification agent (7) and before performing heat exchange between the coal gas and the water to produce the vapor (4), a dry low temperature separation processing is performed and the separated pulverized coal (5) is sent back to the coal gas producer (a). The temperature of the high temperature gasification agent (7) is 750°C-850°C, and the high temperature gasification agent is fed through three locations of the coal gas producer (a). The method of the present invention has the advantages of being low in coal consumption, less in equipment loss, and high in the thermal value of the produced coal gas.</p> |
