Sometimes the boiler will suddenly have some conditions and face the emergency shutdown. Based on past experience, we have summarized the situation and treatment measures of boiler emergency shutdown to help you better understand the boiler.
First, emergency shutdown is required when the following conditions occur.
1. The steam pressure exceeds the allowable safety pressure. After taking the natural gas supply, strengthening the water supply and reducing the wind, the pressure is still rising.
2. the boiler is short of water, the water level table has not shown the water level, the water level is still not visible when the steam drum level valve is closed or the water supply is increased.
3. The boiler is full of water and the water level has risen to the highest visible water level, but no visible water level appears after the water is released.
4. All water level gauges or pressure gauges cannot be used normally.
5. All safety valves and drain valves cannot be used normally.
6. Boiler pressure parts, such as drums, furnace tubes, water wall tubes, etc., are damaged, when it is dangerous for people and equipment.
7. The water supply equipment is faulty and there is no spare equipment.
8. When there is a crack in the furnace wall, there will be collapse danger.
9. The induced and forced draft fan are damaged and cannot continue to run.
10. Other events seriously threaten the safe operation of the boiler.
Second, emergency shutdown process steps.
1. Quickly turn off the heat treatment. First stop the burner, and close the natural gas supply valve to stop the supply of gas, then cut off the total air valve, and finally open the air valve or safety valve to exhaust steam and reduce precipitation.
2. Rapidly cool the furnace water treatment. Do not continue to feed water into the boiler after the furnace has been shut down.
When there is no water shortage or water leakage, the cooling time can be shortened, the cooling rate can be accelerated, and the water level can be lowered and lowered by the alternate method of water ingress and discharge.
When the boiler is in a serious water shortage state, it is not allowed to adopt rapid cooling method. It is strictly forbidden to continue to supply water to the boiler, otherwise there is a risk of explosion.
When the boiler is in full water state, it should weaken the combustion (the fire is considered to be changed into a small fire), open the drain valve to release the water, and open the steam trap on the main steam pipe and the sub-cylinder to prevent the steam from taking a lot of water and causing water washing.
3. During the process of stopping the furnace, the furnace cooling rate should not be too fast, so as to prevent damage to the components such as flue, pressure parts and expansion ports due to sudden cooling.
