Why cannot the flame detection protection be disabled during the ignition process of a circulating fluidized bed boiler?
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Why cannot the flame detection protection be disabled during the ignition process of a circulating fluidized bed boiler?
During the ignition process, if the flame detection protection is disabled, and the fuel gun does not burn properly resulting in a flameout while the flame detection system fails to function, the fuel control valve will continue to supply fuel. This leads to an abundance of unburned oil droplets in the ignition air duct, which can easily cause an explosion and significant damage; therefore, the flame detection protection must not be disabled.
Both TSG and NFPA regulations require a flame check during ignition; if a stable flame is not generated within a certain number of seconds, it is necessary to close the main fuel isolation valve or the corresponding fuel cut-off valve