Abstract: Provided is an integrated coal gasification combined cycle apparatus that can operate a coal pulverizer using gas turbine exhaust gas as drying gas even when the concentration of oxygen in the gas turbine exhaust gas to be used as the drying gas is temporarily increased. In the integrated coal gasification combined cycle plant using combustion exhaust gas from a gas turbine as the drying gas for a coal pulverizer and adjusting the temperature of the drying gas by mixing outlet gas from a denitration device installed inside an exhaust gas boiler and outlet gas from the exhaust gas boiler, an auxiliary burner is started when the concentration of oxygen in the drying gas is increased to a predetermined value or more and is installed so as to adjust the concentration of oxygen in the drying gas using the combustion exhaust gas generated thereby.

Abstract: Provided is an air-blown integrated coal gasification combined cycle power generation system equipped with a carbon-dioxide capturing device, in which the integrated coal gasification combined cycle power generation system eliminates the need for an air separator by obtaining a new carrier source that replaces nitrogen gas serving as a carrier gas for pressurizing and carrying pulverized coal and char. In an integrated coal gasification combined cycle power generation system that employs an air combustion method of using air as an oxidizing agent to generate coal gas in a gasification furnace and that supplies the coal gas to a gas turbine after separating and capturing carbon dioxide from the coal gas in a carbon-dioxide capturing device, a portion of the carbon dioxide separated and captured by the carbon-dioxide capturing device is used as a carrier gas for pulverized coal and char.

Abstract: Provided is a gasification furnace apparatus equipped with a supply source of low-oxygen-concentration drying gas that does not require fuel. A coal pulverizer that produces pulverized coal by pulverizing coal, an air separator that separates air into oxygen gas and nitrogen gas, and a gasification furnace that produces product gas by introducing thereinto the pulverized coal and the oxygen gas, are included. By receiving a supply of excess nitrogen gas from the air separator, the air diluted with nitrogen is used as a source of low-oxygen-concentration gas for drying the pulverized coal, and an air heater that heats the source of low-oxygen-concentration gas to a temperature at which drying can be performed is provided.

Abstract: A filter regeneration apparatus of a coal gasification system having a filter for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace, fills the filter container with inactive gas having oxygen concentration of less than 5 vol. % and heat the filter to a target temperature of 400 to 450° C. and feed ashing gas having oxygen concentration of 5 to 15 vol. %, thereby ashing char in the filter. This method and apparatus achieve ashing of char in a safe manner and shortens the time of regenerating the filter by controlling the oxygen concentration in the ashing gas and the filter temperature constantly to reach preset target values.

Abstract: An object is to provide a gate valve capable of preventing operational deficiencies caused by particulate materials accumulating in a valve box, thus providing superior sealing properties and high durability, having a simple structure, and allowing inspection and maintenance to be performed easily.

Abstract: An object is to provide a gate valve capable of preventing operational deficiencies caused by particulate materials accumulating in a valve box, thus providing superior sealing properties and high durability, having a simple structure, and allowing inspection and maintenance to be performed easily.

Abstract: A filter regeneration apparatus of a coal gasification system having a filter for capturing char (unburned matter) present in exhaust gas at an exhaust gas passage communicating with exhaust gas source including a coal gasification furnace, fills the filter container with inactive gas having oxygen concentration of less than 5 vol. % and heat the filter to a target temperature of 400 to 450° C. and feed ashing gas having oxygen concentration of 5 to 15 vol. %, thereby ashing char in the filter. This method and apparatus achieve ashing of char in a safe manner and shortens the time of regenerating the filter by controlling the oxygen concentration in the ashing gas and the filter temperature constantly to reach preset target values.