Combustion unit

Abstract

Abstract PURPOSE:To accelerate the normal operation of a major combustion unit by a method wherein an air preheater for a start-up is installed at the upstream side of a first-stage catalyst combustion unit, fuel is mixed with the preheating air and passed through a catalyst layer to perform combustion, an amount of mixing air is controlled to mix the fuel with air and passed through a second-stage catalyst layer to perform combustion. CONSTITUTION:Air divided to flow from an air major pipe 1 is heated by a start-up air heater 5 to a temperature higher than an ignition temperature of a catalyst and enters a first-stage fuel mixing unit 6, is mixed with fuel in the first-stage fuel supplying pipe 7, flowed to a first-stage combustion cylinder 9 and then ignited in a first-stage combustion catalyst 8. The combustion generated gas having entered the second-stage catalyst combustion cylinder 12 is mixed with the air in the supplying pipe 11 and an amount of mixed air is adjusted in such a way as its temperature is more than a catalyst combustion temperature and less than a combustion temperature of fuel mixture. Fuel from the second-stage fuel mixing unit 14 is mixed in the mixed gas with the second-stage fuel mixing unit 14, ignited with the second-stage catalyst 15, enters the third-stage catalyst combustion cylinder 16 mixed with the air in the air pipe 1, the fuel in the third-stage fuel supplying pipe 17 is mixed by the third-stage fuel mixing unit 18 and then the fuel is ignited with the third catalyst.

Inventors

• 👤 Saburo Maruko
• 👤 三郎 丸子

Bibliographic Details