TEMPERATURE CONTROL OF CYCLONE COAL COMBUSTION FURNACE

• Main Authors: FUJII KENICHI, SUZUTANI SHINGO, SHIRAHA MICHIHIRO
• Format: Patent
• Language: English
• Published: 29.01.1990
• Subjects: AIR SUPPLY; BLASTING; BURNERS; CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FORCOMBUSTION CHAMBERS, e.g. FIREBRIDGES; CHEMISTRY; COMBUSTION APPARATUS; COMBUSTION PROCESSES; DESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FORPRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDEDFOR; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS INCOMBUSTION CHAMBERS; DRAUGHT-INDUCING; FUELS; HEATING; LIGHTING; LUBRICANTS; MECHANICAL ENGINEERING; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; REGULATING OR CONTROLLING COMBUSTION; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTIONAPPARATUS; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS; TECHNICAL GASES CONTAINING CARBON MONOXIDE; WEAPONS

PURPOSE:To make it possible to control the temperature of the furnace wall even during the operation under a low load by utilizing air used for secondary combustion and air used for two-stage combustion for cooling the body of a furnace and at the same time controlling the amount of circulation of cooling air while the temperature of the furnace wall is sensed. CONSTITUTION:After the main body 2 of a cyclone is cooled by supplying combustion air to a cooling air flow channel 18 which is between the inner plate 16 and outer plate 17 of the main body 2 of the cyclone, the combustion air is used as secondary air and two-stage combustion air. And part of exhaust gas from the combustion of a secondary furnace is used with the combustion air for cooling the main body 2 of the cyclone by circulating the exhaust gas and combustion air, and the temperature of the inner plate 16 is sensed and the opening and closing of a damper 28 or a valve in a line 27 of the circulating air are made after the main body 2 of the cyclone is cooled in order to regulate the volume of the circulating air sent to a cooling gas flow channel 18. Namely, the volume of the circulating air is regulated by the damper 28 or the valve in order to prevent an excessive rise in the temperature of the inner plate 16. And, the surface temperature of a refractory material 32 which is lined on the inner plate 16 is sensed and a damper 34 or a valve of a circulation line 25 of the exhaust gas from the combustion is controlled by its opening or closing.