Coal oxygen-free catalytic gasification method and system

Abstract

The invention relates to the technical field of coal resources, in particular to a coal anaerobic catalytic gasification method and system. The oxygen-free catalytic coal gasification method comprisesthe following steps: introducing pulverized coal into a gasification device, gasifying the pulverized coal in the gasification device, generating ash and gas, introducing the gas into a gas separation device, separating the gas into dust and synthesis gas through the gas separation device, introducing the synthesis gas into the gasification device, introducing the synthesis gas into the gasification device so that synthesis gas is subjected to gasification reaction in the gasification device,and thus the conversion rate of carbon is improved, introducing ash and dust into a calcining device,calcining the ash and the dust through the calcining device, and introducing a product generated by calcining of the calcining device into a gasification device, so that the product is subjected to gasification reaction in the gasification device, and the conversion rate of carbon is further improved. The problems of high residual carbon content in discharged ash and incomplete utilization of carbon in feed coal in the prior art are solved.

Description

technical field [0001] The present disclosure relates to the technical field of coal resources, in particular to a coal-free catalytic gasification method and system. Background technique [0002] With the rapid economic development and increasingly stringent environmental regulations, the demand for natural gas, a clean energy, is growing explosively. Catalytic gasification technology is an important way to cleanly and efficiently utilize coal. Catalytic gasification technology is used to make coal react with gasification agent at a relatively low temperature under the catalytic action of catalyst to generate high-concentration methane . [0003] The existing oxygen-free oxidation catalytic gasification process is to separate the synthetic gas from the crude gas, mix it with hot steam, and send it to the gasifier after being superheated to 850°C. Sensible heat maintains the gasification temperature at about 700°C; the gasification temperature is low, the reaction rate is ...

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Problems solved by technology

[0003] The existing oxygen-free oxidation catalytic gasification process is to separate the synthetic gas from the crude gas, mix it with hot steam, and send it to the gasifier after being superheated to 850°C. Sensible heat maintains the gasification temperature at about 700°C; the gasification temperature is low, the reaction rate is slow, and the stubborn carbon in the furnace is difficult to convert, and the synthesis gas can inhibit the carbon water reaction after returning to the furnace. If a higher carbon conversion rate is required A long gas-solid contact time is required, the residual carbon in the discharged ash is high, and the carbon in the raw coal is not fully utilized

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