Abstract
No.2 boiler is designed by Dongfang boiler group Co., LTD, and is ultra supercritical parameter boiler with variable pressure. In order to alleviate the side wall temperature deviation and to reduce the maximum wall temperature of super-heater, the total air volume alteration test, external secondary air damper alteration test, over-fire air alteration test and the shrinkage adjustment is performed. The test results show that oxygen increase and shrinkage adjustment can improve the deviation of wall temperature and steam temperature. After increasing oxygen, plate super-heater wall temperature deviation reduced by 26 °C, and its outlet steam temperature deviation reduced by 14 °C. After shrinkage adjustment, plate super-heater wall temperature deviation reduced by 34 °C, and the wall temperature difference of final super-heater reduced from 50 °C to 25 °C, the wall temperature of side B plate super-heater reduced by 25 °C.
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