If the circulating fluidized bed boiler needs to stop operation for a short period of time, or if the boiler is shut down due to an accident and can resume operation in a short period of time, the boiler can be pressure fired. The specific operation steps are as follows: 1. Before pressurizing, the steam turbine and other operating units should be notified to prepare for pressurizing; 2. Before pressurizing, the thickness of the discharge layer should be estimated based on the operating air volume and air chamber air pressure, and the bed temperature (furnace dense phase area) should be adjusted appropriately. Generally, It can be controlled at 900~950℃; 3. When the combustion temperature is adjusted to be stable, first stop the coal feeder and stop feeding coal into the furnace. When the bed temperature shows a downward trend (usually drops by 5~10℃); at the same time, stop the fan once , the secondary air fan and the induced draft fan and quickly close the fan baffle doors and the air duct baffle doors to prevent air from leaking into the furnace and causing the boiler to burn out and coke; 4. After the boiler is pressed, the heat and pressure should be maintained, and the steam parameters should be appropriately maintained. Open the air exhaust valve to adjust the steam pressure and temperature to prevent over-temperature and over-pressure; 5. Strictly monitor the steam temperature, steam pressure and drum water level, control the drum water level at ±50mm, and close the economizer when filling water. Circulation door, the economizer recirculation door should be closed when water supply is stopped; 6. After pressure fire, the ash pipe should be discharged from the return valve in time to prevent the circulating ash from being exhausted; 7. After pressure fire, a comprehensive inspection of the boiler should be carried out, and Stop the dust collector; 8. Generally, the boiler pressing time is as long as 8 hours, but the length of the boiler pressing time depends on the material layer thickness and bed material temperature. Therefore, after pressing, the bed temperature should be strictly monitored. When the bed temperature When the temperature is lower than 600℃, the boiler should be started and the combustion should be stabilized before performing the pressure-fire operation to ensure that the boiler does not extinguish the fire (it is generally recommended to start the boiler after about 5 hours)