Coal fired SZL double drum water tube chain grate steam boiler
Specifications
The drum consists of arched tube sheet and spirally corrugated tube, so as to prevent the tube sheet from cracking. 
The ascending calandria are arranged under the drum. With this arrangement, the dead water zone at the bottom of drum is eliminated, and the sludge is difficult to subside on it. As a result, the high-temperature region of drum obtains better cooling, and the bulge phenomenon at the bottom of boiler is eliminated effectively.
The optimal design of the spirally corrugated tube strengthens the heat transfer, speeds up temperature rapidly and enhances the boiler steam rate. 
It is the rational design of arch inside the furnace that improves combustion condition, enhances the dust failing function in it and reduces the pollutant emission of the boiler.
With good sealing, the wind box is easily to operate and can provide rational wind. Consequently, it reduces the air excess coefficient and increases the boiler thermal efficiency.
DZL PRODUCTION PROCESS
