Boiler shutdown maintenance Commonly used shutdown maintenance has pressure maintenance, wet maintenance, etc. (1) Pressure maintenance Pressure maintenance is generally applicable to boilers that have been shut down for less than one week. The residual pressure in the boiler is maintained at 0.5 MPa to 0.1 MPa, and the boiler temperature is higher than 100 ° C. Even if the boiler water does not contain oxygen, the air can be prevented from entering the boiler. In order to maintain the temperature of the furnace water, it can be periodically fired in the furnace; (2) Wet maintenance The wet maintenance is generally applicable to boilers with a shutdown time of less than one month. After the boiler is shut down, the water is drained and the scale is clear. And soot, close all manholes, hand holes and valves, etc., then add soft water to the lowest water level line, and then use a special pump to inject the prepared alkaline protection liquid into the boiler. The composition of the protective liquid is: NaOH is added 8-10 Kg per ton of pot water, or 20 kg of Na3PO3 is added per ton of pot water. When the protective liquid is completely injected, open the water supply valve, fill the boiler with soft water until the water emerges from the air valve, then close the air valve and the water supply valve, and turn on the special pump for water circulation to make the solution mix evenly. During the whole maintenance period, it is necessary to regularly produce a micro-fire oven to keep the outside of the heated surface dry; periodically open the pump for water circulation, so that the concentration of the solution is consistent everywhere; antifreeze measures should be taken in winter. For details, please visit: http:// http://news.chinawj.com.cn Edit: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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