Gasification furnace operating method and gasification furnace
AssigneesResonac Corporation, Ube Corporation, Ebara Environmental Plant Co., Ltd.
InventorsTomoaki Fukui, Junichi Akiyama
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Abstract
Provided are a gasification furnace operating method, a gasification furnace, a two-stage gasification apparatus, a gasification method for an organic raw material, and a two-stage gasification method for organic waste that make it possible to stably operate a gasification furnace over a long period of time. The present invention provides a gasification furnace operating method including, in a gasification furnace into which an organic raw material is introduced and that produces gas and slag, directly or indirectly introducing an alkali metal-containing compound into the gasification furnace to reduce the viscosity of the slag.
Claims11
A method for operating a gasification furnace in which an organic raw material is charged to form gas and slag, comprising charging an alkali metal-containing compound directly or indirectly into the gasification furnace to reduce the viscosity of the slag, the method characterized by comprising:
- analyzing the content of sodium and silicon of the slag,
- determining, based on the analyzed content, a molar ratio of silicon dioxide and sodium oxide in the slag (the number of moles of silicon dioxide/the number of moles of sodium oxide);
- and
- maintaining the molar ratio of silicon dioxide and sodium oxide in the slag to be 2.5 or more, by controlling charging of the alkali metal-containing compound based on the determined molar ratio, wherein the controlling comprises charging the alkali metal-containing compound when the molar ratio of silicon dioxide and sodium oxide in the slag is 2.5 or less,
- wherein the alkali metal-containing compound is sodium silicate.
A method for two-stage gasifying organic waste, comprising forming an organic raw material by primary gasification of the organic waste in a low temperature gasification furnace, charging the organic raw material into a high temperature gasification furnace, forming gas and slag by secondary gasification of the organic raw material in the high temperature gasification furnace, and charging an alkali metal-containing compound directly or indirectly into the high temperature gasification furnace to reduce the viscosity of the slag, the method characterized by comprising:
- analyzing the content of sodium and silicon of the slag,
- determining, based on the analyzed content, a molar ratio of silicon dioxide and sodium oxide in the slag (the number of moles of silicon dioxide/the number of moles of sodium oxide);
- and
- maintaining the molar ratio of silicon dioxide and sodium oxide in the slag to be 2.5 or more, by controlling charging of the alkali metal-containing compound based on the determined molar ratio, wherein the controlling comprises charging the alkali metal-containing compound when the molar ratio of silicon dioxide and sodium oxide in the slag is 2.5 or less,
- wherein the alkali metal-containing compound is sodium silicate.
Dependencies are inferred from the claim text.