A raw material supply process that supplies a raw material into a flash smelting furnace and supplies a first gas contributing to a reaction of the raw material into the flash smelting furnace, includes: a raw material passage that is provided out of a lance through which the first gas passes, the raw material passing through the raw material passage; and an adjuster that adjusts a distribution of the raw material by blowing a second gas to the raw material passing through the raw material passage.

A dividing-wall rotary kiln device comprises a rotary kiln, an exhaust gas residual-heat power generation device, a gas recovery processing device, a cooler, a combustion fan, a feeding system and an exhaust emission system. A refractory brick unit of a kiln body is a hollow structure formed by a refractory inner cylinder and a refractory outer cylinder. A center of the refractory inner cylinder is a kiln chamber. A material channel is between the refractory inner cylinder and the refractory outer cylinder. The feeding system is connected to a feeding device via a raw material preheating compartment or a dividing-wall preheater. The feeding device is provided with a decomposition gas outlet connected to the gas recovery processing device via the raw material preheating compartment or the dividing-wall preheater. The kiln chamber is connected to the exhaust gas residual-heat power generation device via a kiln tail hood.

A dividing-wall rotary kiln device comprises a rotary kiln, an exhaust gas residual-heat power generation device, a gas recovery processing device, a cooler, a combustion fan, a feeding system and an exhaust emission system. A refractory brick unit of a kiln body is a hollow structure formed by a refractory inner cylinder and a refractory outer cylinder. A center of the refractory inner cylinder is a kiln chamber. A material channel is between the refractory inner cylinder and the refractory outer cylinder. The feeding system is connected to a feeding device via a raw material preheating compartment or a dividing-wall preheater. The feeding device is provided with a decomposition gas outlet connected to the gas recovery processing device via the raw material preheating compartment or the dividing-wall preheater. The kiln chamber is connected to the exhaust gas residual-heat power generation device via a kiln tail hood.

A furnace includes: a furnace body; a housing rotary body including a plurality of side walls, a plurality of housing chambers partitioned by the side walls and disposed circumferentially in multiple stages, each including multiple housing chambers, and a space disposed in the central portion of the housing rotary body to provide a donut shape in plan view; a rotary driving device for rotating the housing rotary body; a heating device for heating the air inside the furnace body; a first and a second partition wall which together partition the inside of the furnace body into the first and the second zone; a first flow passage communicating a blowout port of the fan with outer circumference sides of the housing chambers in the first zone; and a second flow passage communicating outer circumference sides of the housing chambers in the second zone with a suction port of the fan.

A furnace includes: a furnace body; a housing rotary body including a plurality of side walls, a plurality of housing chambers partitioned by the side walls and disposed circumferentially in multiple stages, each including multiple housing chambers, and a space disposed in the central portion of the housing rotary body to provide a donut shape in plan view; a rotary driving device for rotating the housing rotary body; a heating device for heating the air inside the furnace body; a first and a second partition wall which together partition the inside of the furnace body into the first and the second zone; a first flow passage communicating a blowout port of the fan with outer circumference sides of the housing chambers in the first zone; and a second flow passage communicating outer circumference sides of the housing chambers in the second zone with a suction port of the fan.

A plant for producing cement clinker, comprising as viewed in the direction of materials flow, a heat exchanger to preheat raw meal, a downstream calciner to calcine the raw meal, a rotary kiln to sinter the calcined raw meal, and a clinker cooler to cool the sintered cement clinker. A combustion device which carbonizes, pyrolysis or burns difficult fuels, is embodied as a pot reactor or gooseneck reactor in an inverted U-shape, and is positioned upstream of the calciner on the flow path of the exhaust gases from the rotary kiln to the calciner, and has a gas outlet that opens out above a tertiary-air line of the clinker cooler into the calciner. As a result, it becomes possible to burn fuel which is lumpy and/or has poor ignitability, and the gases from incomplete combustion in the reactor are available in the calciner in gaseous form for further combustion.

A dividing-wall rotary kiln device comprises a rotary kiln, an exhaust gas residual-heat power generation device, a gas recovery processing device, a cooler, a combustion fan, a feeding system and an exhaust emission system. A refractory brick unit of a kiln body is a hollow structure formed by a refractory inner cylinder and a refractory outer cylinder. A center of the refractory inner cylinder is a kiln chamber. A material channel is between the refractory inner cylinder and the refractory outer cylinder. The feeding system is connected to a feeding device via a raw material preheating compartment or a dividing-wall preheater. The feeding device is provided with a decomposition gas outlet connected to the gas recovery processing device via the raw material preheating compartment or the dividing-wall preheater. The kiln chamber is connected to the exhaust gas residual-heat power generation device via a kiln tail hood.

A dividing-wall rotary kiln device comprises a rotary kiln, an exhaust gas residual-heat power generation device, a gas recovery processing device, a cooler, a combustion fan, a feeding system and an exhaust emission system. A refractory brick unit of a kiln body is a hollow structure formed by a refractory inner cylinder and a refractory outer cylinder. A center of the refractory inner cylinder is a kiln chamber. A material channel is between the refractory inner cylinder and the refractory outer cylinder. The feeding system is connected to a feeding device via a raw material preheating compartment or a dividing-wall preheater. The feeding device is provided with a decomposition gas outlet connected to the gas recovery processing device via the raw material preheating compartment or the dividing-wall preheater. The kiln chamber is connected to the exhaust gas residual-heat power generation device via a kiln tail hood.

To provide a method for operating a blast furnace with which the combustion efficiency of a solid fuel, such as pulverized coal, is improved, thereby making it possible to improve productivity and reduce CO.sub.2 emissions. Pulverized coal and LNG are blown from an upstream lance configured by a double tube, and oxygen is blown from a downstream lance on the downstream side in a hot air blast direction, so that oxygen used for preceding combustion of the LNG is supplied from the downstream lance, and the pulverized coal whose temperature has been increased by the combustion of the LNG is combusted along with the supplied oxygen. When a direction perpendicular to the hot air blast direction is designated as 0 , and a downstream direction and an upstream direction therefrom in the hot air blast direction are designated as positive and negative, respectively, a blowing direction of the oxygen from the downstream lance with respect to the blast direction ranges from 30 to +45 , and a blowing position of the oxygen from the downstream lance with reference to a position at which the upstream lance is inserted into a blast pipe ranges from 160 to 200 in terms of a blast pipe circumferential direction angle.

To provide a method for operating a blast furnace with which the combustion efficiency of a solid fuel, such as pulverized coal, is improved, thereby making it possible to improve productivity and reduce CO.sub.2 emissions. Pulverized coal and LNG are blown from an upstream lance configured by a double tube, and oxygen is blown from a downstream lance on the downstream side in a hot air blast direction, so that oxygen used for preceding combustion of the LNG is supplied from the downstream lance, and the pulverized coal whose temperature has been increased by the combustion of the LNG is combusted along with the supplied oxygen. When a direction perpendicular to the hot air blast direction is designated as 0 , and a downstream direction and an upstream direction therefrom in the hot air blast direction are designated as positive and negative, respectively, a blowing direction of the oxygen from the downstream lance with respect to the blast direction ranges from 30 to +45 , and a blowing position of the oxygen from the downstream lance with reference to a position at which the upstream lance is inserted into a blast pipe ranges from 160 to 200 in terms of a blast pipe circumferential direction angle.