The influence of fixed carbon content on coal gasification
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I would like to ask, what is the impact of fixed carbon on the gasification properties?
Fixed carbon is an important source of the calorific value of coal; the higher its content, the better. A high fixed carbon content is beneficial for effective gas production.
Fixed carbon is an indicator of the degree of coal conversion. The SHELL process does not impose strict requirements on the fixed carbon content of coal, but its level directly affects the economic efficiency of plant operation, as well as the gasification load and the composition of the gas produced. Especially when changing types of coal, if there is a large difference in fixed carbon content, it becomes difficult to control the oxygen-to-carbon ratio, which can lead to overheating of the gasifier and damage to its accessories. If CO2 is used as the carrier gas to transport coal powder, it promotes the reaction of CO2 + C = 2CO, reduces oxygen consumption, and increases the content of useful gases in the gas (6-9%). If coal with a high fixed carbon content is used, it is possible to operate the system at an overload condition to improve its economic efficiency.
High fixed carbon content, with a relatively high syngas yield； High fixed carbon content results in reduced oxygen consumption per unit ； The high fixed carbon content and low handling load for fly ash and slag are beneficial to the operation of this system.