3.11.7.4 检修风门时（用控制设备）应始终将风门固定在关闭位置，

3.11.7.4 When inspecting and repairing the air door (using control equipment), <br>always fix the air door in the closed position and lock the air door mechanically. <br>3.11.7.5 The countermeasures in the event of a fire in the bag filter <br>immediately shut down the boiler. <br>Switch the dust collector to the bypass condition and reduce the flue gas flow. <br>Call the fire brigade. <br>Stop the operation of the ash conveying system. <br>After the fire is extinguished (after a few hours), take the following measures: <br>wear tights and wear a full mask. <br>Check whether the fan is running at the lowest speed. <br>Open all the doors and hatches of the building to ensure good ventilation on the top of the dust collector. <br>Carefully open the access door of the ash hopper to check the degree of fire hazard. <br>Check all filter bags and replace all damaged filter bags (see "Revision and Maintenance Section" in Part 2). <br>Check and clean the inside of the dust collector. <br>Start the dust collector.

3.11.7.4 when overhauling the damper (with control equipment)<br>The damper shall always be fixed in the closed position and mechanically locked.<br>3.11.7.5 Countermeasures in case of fire of bag filter<br>Shut down the boiler immediately.<br>Switch the dust collector to the bypass condition and reduce the flue gas flow.<br>Call the fire brigade.<br>Stop the operation of ash conveying system.<br>After the fire is put out (after several hours), the following measures shall be taken:<br>Put on tight clothes and a complete mask.<br>Check whether the fan operates at the lowest speed.<br>Open all doors and hatches of the building to ensure good ventilation at the top of the dust collector.<br>Carefully open the access door of the ash hopper to check the degree of fire hazard.<br>Check all filter bags and replace all damaged filter bags (see section "correction and maintenance" in part 2).<br>Check and clean the interior of the dust collector.<br>Start the dust collector.

When 3.11.7.4 overhauls the air door (with control equipment) Always fix the damper in the closed position and mechanically lock the damper. Countermeasures in case of fire of bag filter in 3.11.7.5 Stop the boiler immediately. Switch the dust collector to bypass condition and reduce the flue gas flow. Call the fire brigade. Stop the operation of ash conveying system. After the fire is put out (after several hours), take the following measures: Put on tights and a full mask. Check whether the fan is running at the lowest speed. Open all doors and hatches of the building to ensure good ventilation at the top of the dust collector. Carefully open the access door of the ash hopper to check the degree of fire hazard. Check all filter bags and replace all damaged filter bags (see Part 2 "Correction and Maintenance"). Check and clean the inside of the dust collector. Start the dust collector.