The coal ignition temperature in CFB boiler
The coal ignition temperature in CFB boilers,the lowest bed temperature required for static coal combustion, is an important parameter for designing the start up burner and for choosing the automatic control parameters during the start up process.
Traditionally, the coal ignition temperature in CFB boilers is estimated from experience with little theoretical basis and relatively large uncertainties in the estimates. These uncertainties result in operating difficulties and economic loses. For example, if the coal is fed into a furnace at a temperature lower than, the coal will not burn and the furnace temperature will decrease even more. Once the fuel concentration and temperature in the furnace reach the critical conditions, the mixture will flash and the furnace temperature will suddenly increase which leads to control problems. Feeding the coal in the furnace at temperatures higher than is safer but costs more start up time and fuel. Laboratory scale fluidized beds are often used to measure the coal ignition temperature in CFB boilers, based on the criteria such as the flame and spark characteristics, bed temperature response and oxygen response.The coal ignition temperaturein, in fluidized beds boilers is not only a function of the physical and chemical properties of the coal, but is also influenced by the heating rate, the boiler structure, the fluidization velocity and the particle size as well. Therefore, a set of standard operating conditions was specified for the measurements of the coal ignition temperature,in a laboratory scale fluidized bed boiler. This article described a standard for measuring the coal ignition temperature with typical results in a laboratory scale fluidized bed with under-bed preheat system. The tests measured for seven coal types were compared with the actual feed temperatures, in real CFB boilers in China at various loads. The temperature differences between measured in the laboratory fluidized bed and measured in the real CFB boilers for the various types of coal were plotted against the proximate analysis of the coal to estimate the lowest feed temperature in real CFB boilers.
Coal ignition temperatures in a laboratory scale fluidized bed with under-bed preheat system were measured at a standardized operation conditions. The ignition temperatures of seven coal types measured in the test rig were compared with the feed temperatures in real CFB boilers in China for various volatile content.
The results show that the ignition temperatures measured in the laboratory-fluidized bed accurately represent the real feed temperatures except for one anthracite coal type. Therefore, the feed temperatures in CFB boilers can be estimated from the ignition temperatures measured in laboratory scale test rig and the volatile content.
Circulating fluidised bed Boiler Cases
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