Gasification apparatus

Abstract

A gasification apparatus comprises: a gasifier (2); a char discharge device (4); first to sixth temperature sensors (detection units) T1, T2, . . .; and a control device. In the gasifier (2), a raw material is pyrolyzed to generate gas, and a carbide produced by the process is deposited. The char discharge device (4) discharges the deposited carbide to the outside of the gasifier (2). The detection units detect the height of the upper surface of a carbide deposition layer. The control device repeatedly performs control to change the discharge speed of the char discharge device (4) from a current discharge speed on the basis of a difference between the current height of the upper surface of the carbide deposition layer obtained from the detection results of the detection units, and a targetdeposition height that is established in advance.

Description

technical field [0001] The present invention relates to a gasification device including a gasification furnace that generates gas by thermally decomposing a raw material. Background technique [0002] Conventionally, gasification apparatuses for gasifying raw materials (typically, biomass) are known. As the above-mentioned gasification apparatus, there is, for example, a fixed-bed downdraft gasification apparatus that has a simple furnace structure and is generally considered to generate less tar. [0003] In a general fixed-bed downdraft gasification device, the biomass fed into the gasification furnace as a raw material reacts in the order of thermal decomposition, oxidation, and reduction, and gas is generated during this process. Carbide (char) generated during these reactions accumulates in the lower portion of the gasifier, but after a certain period of time, the deposited char is discharged to the outside of the gasifier from a discharge device. [0004] In the gasi...

AI Technical Summary

Problems solved by technology

However, Patent Document 2 mainly aims at continuously obtaining the temperature (peak temperature) of the combustion zone that needs to be monitored in order to improve the gasification efficiency in the moving bed gasifier, and only discloses that the discharge of char is appropriately stopped and started so that The position of the combustion zone is continuously changed up and down within the range of the furnace height direction where the temperature sensor group is installed

That is, even referring to the control disclosed in Patent Document 2, it is impossible to keep the upper surface of the char deposit layer in the gasification furnace near the target height.

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