Thread Content
Boiler outage 1. When the boiler is planned to be shut down, a comprehensive inspection of the boiler equipment should be carried out before shutting down, and defects should be counted so that they can be eliminated after the boiler is shut down. 1.2 After receiving the notice from the duty leader and squad leader, gradually reduce the oil volume and air volume (lower the oil pressure and disassemble the oiling gun). 1.3 Closely monitor changes in water level, steam pressure, steam temperature and other parameters, and delineate water supply to automatically and manually adjust the water level. ； Continuous sewage discharge is introduced (neither the in-furnace dosing system nor the continuous sewage discharge system of this boiler is used). 1.4 When the steam pressure of the furnace is close to the main pipe pressure, close the main steam valve and open the air exhaust and superheater drain door to cool the superheater for 10 minutes. 1.5 Turn off the boiler, disconnect the oil gun, ventilate for 3 to 5 minutes, stop the fan, close the fan inlet and flue baffle, close each door hole, and seal the furnace. 1.6 Keep the water level at the highest visible water level of the water level gauge, and drain the bottom of the furnace once. When there is no need to replenish water, stop the water supply pump, close the cut-off door and adjustment door of the water supply system, and open the drain door for 5 to 10 minutes. Close the water replenishment door of the water tank (when the adjacent furnace is not running). 1.7 Continue to monitor whether the exhaust gas temperature drops normally for a period of time to prevent secondary combustion. 1.8 If the furnace is shut down for more than 4 hours, the flue baffle, fan baffle, inspection hole, etc. can be opened for ventilation and cooling. 1.9 When the steam pressure drops to 0.3MPa and the furnace water temperature is 100°C, open all drain doors to fully drain the water. 1.10 Before the boiler loses all pressure, the water level, pressure, exhaust temperature, etc. should continue to be monitored. ； Before each auxiliary machine is powered off, monitoring of the operating panel should not be given up. 1.11 Disassemble and purge the incoming oil pipe according to specific conditions (see operation ticket). 2 Boiler anti-corrosion 2.1. Drying and anti-corrosion. a) Drying and anti-corrosion are used for boilers that are to be used for standby or maintenance within one month. b) After the boiler is shut down, all smoke and wind baffles, doors and holes should be sealed to prevent waste heat from being lost. c) Control the pressure reduction speed as follows: Time (hour) 0 1 2 3 Pressure (MPa) 1.3 1.0 0.50 0 d) When the pressure drops below 0.3MPa, the boiler will quickly release water in all directions. After the furnace water is drained (including the water supply pipeline), use the residual heat to dry. If necessary, add an oil gun to make the smoke temperature rise to 130°C, then turn off the flame and stop the furnace. After drying, use a glass piece to monitor the upper air door for no water vapor, then the drying is qualified (the water release door and air door will be disassembled during the test). e) Open all dampers, baffles, doors, and holes for natural ventilation. You can also start the air blower to enhance cooling according to maintenance requirements. f) If the adjacent furnace is running, the steam and water systems must be isolated and the valves must be listed. 2.2. Corrosion inhibitor for corrosion protection. a) This anti-corrosion is used for the anti-corrosion of long-term standby (more than one month) boilers. b) On the basis of drying and anti-corrosion, add corrosion inhibitor powder into the furnace. c) Operation: Open the air door and exhaust door of the superheater, put a jellyfish tube door at the bottom and install a temporary pipe. Use compressed air and a dosing device (medicinal electric heater) to heat and blow powder into the furnace (this operation involves chemical operations, and the boiler cooperates). d) After the prescribed amount of medicine is added, chemical determination is made to determine whether it is qualified. After passing the test, close the superheater air door, open the air exhaust valve and the lower steam drum drain door, remove the temporary dosing pipe and seal it. 2.3. Hot press anti-corrosion. a) Steam hot-pressure anti-corrosion is suitable for short-term standby and boilers without pressure-bearing parts maintenance when conditions permit (low-pressure steam source is available). b) After the boiler is turned off, the pressure drops to 0.7MPa, and the water change begins (draining water while draining the water). When the water quality passes the test, stop the water change. c) Close the water supply and sewage drain doors, slowly open the bypass door of the main steam valve, and charge the furnace pressure with steam to 0.5~0.7MPa to maintain the pressure for corrosion protection. d) This method is more economical and suitable for quick start-up