Slag well

The slag well is disposed underneath the lower header of the boiler and mainly works to store slags caused by accidents and absorb the expansion of the water wall of the boiler. In general, the slag should be given a storage volume of not less than 4 hours of slag discharge of the unit under MCR working condition. The slag well is usually independently supported. When an independently supported one is adopted, enough position should be reserved for the horizontal pull-out and maintenance of the lower submerged scraper conveyor. The water seal tank of the slag well can effectively absorb the vertical and horizontal expansion of the boiler water wall, and is equipped with flushing and drainage components. When the suspension-type installation is adopted, the expansion of the boiler is absorbed by the lower device as there is no water seal tank. The water seal tank is arranged around the slag well, and the water level in the tank and the slag bucket seal are maintained by the continuously overflowing sealing water. Besides, a cooling water spray device is provided in the slag well, and the observation window and slag hole for spray cooling are also provided. The slag well is resistant to high temperature not less than 800℃. 

The slag well is equipped with manhole, peephole, coke hole and inspection hole. A footpath and escalator is set in the above position. The upper part of the slag well is connected with the water seal plate of the lower header of the boiler, and the lower part with the cut-off gate of the slag well. The supplier will ensure the leakproofness of the boiler bottom. The lining of the slag well is impact-resistant and has a service life of no less than 100,000 hours. 

 

 

The user is required to provide the elevation and dimensions of the lower header of the boiler, dimensions of the boiler throat, vertical and horizontal expansion of the water wall of the boiler, slag output of the unit under MCR working condition and pressure protection value of the boiler. If the boiler factory provides supporting water sealing plug plate and ash damper, their elevation and dimensions are required. In case of any special requirement, please let us be informed.