Gas Analysis of Boiler Bottom Room above Water Seal

The gas composition of boiler bottom room above the water-seal is very important to the steady operation of utility boilers in thermal power plant. As the water seal keeps air from entering the bottom room of the boiler, the gas there is comparatively enclosed. Coal particles fall down into the water from main burning area with high temperature. There is the possibility that carbon at high temperature react with water to produce combustible gases such as CO. When large quantities of slag fall down from the furnace into the water seal, the furnace pressure fluctuates widely and sharply, which leads to the flame out of the boiler quite often. The understanding of gas composition of the bottom room above water seal would help to find the reason of the pressure fluctuation. On the other hand, the gas composition above the water seal is the basic information that is deeded to research the whole burning process of coal particles and to maintain the steady operation state of boilers. Measurements were made to reveal the gas composition above the water seal. Temperature of gas just above the water seal was also measured. According to the measurement, CO concentration of high than 1000ppm was detected and the gas composition under normal state was analyzed.