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Principle of Coal Fired Steam Boiler

 DZL series steam boiler adopts segmented air supply to meet the requirements of different combustion zones. It adopts low resistance, high expansion type threaded smoke tube heat transfer technology, high thermal efficiency. The lower part of the drum is equipped with an "X"-shaped water-cooled wall tube to lift the drum and the high-temperature flame, and prevent the occurrence of vicious explosion accidents such as "bulging" and "cracking" of the boiler.



The second return pass of the coal-fired steam water-fire tube boiler adopts a "wing-shaped" flue, which can prevent the rear tube from cracking due to subcooled boiling. The coal-fired boiler adopts automatic water replenishment, and is equipped with electrodes, and low-safety water level alarm interlock protection. Equipped with high-quality valves and reliable auxiliary machines and accessories to ensure efficient and reliable operation of the boiler.

The DZL series boiler is a single-tube vertical water-fire tube shell boiler. The body structure is a row tube type and a wing flue type. The combustion equipment is divided into a chain grate and a reciprocating grate. The water circulation of this series of boiler products can be divided into natural circulation plus ejection circulation and forced circulation. The water walls on the left and right sides of the furnace and the lower part of the boiler shell are radiant heating surfaces, and the convection heating surfaces of threaded smoke pipes are arranged in the boiler barrel, and the front and rear arches The furnace wall adopts a new process of integral pouring and ramming of heat-resistant concrete, and the outer side of the boiler theme is a three-dimensional protective panel shell with baking varnish.

Combustion process of coal-fired steam boiler: the coal is burned from the coal hopper to the front of the grate. With the operation of the grate, the coal undergoes preheating, dry distillation, ignition, and burnout. The cinder falls into the slag hopper and is removed by the slag remover. Tobacco pipes in the front and rear arches form a vortex to fully mix with air, and heat the front arch to improve the fire conditions. It enters the left or two-wing convection tube bundles through the smoke window that does not exit on the arch, and enters through the side smoke box and the front smoke box. The threaded smoke pipe passes through the economizer and the dust collector, and is led to the chimney by the induced draft fan to be discharged.



The boiler adopts a threaded smoke tube to enhance heat transfer and improve the heat transfer coefficient and thermal efficiency. Because the flue gas is disturbed in the tube, it is not easy to collect ash in the flue tube, which plays a role of self-cleaning. The coal-fired steam boiler adopts a heat-resistant concrete integral pouring wall and a vermiculite concrete protective layer on the outer wall, which enhances the tightness of the furnace wall, reduces the air leakage coefficient of the furnace wall, and avoids the effect of short-circuit flue gas on the output and efficiency of the boiler.

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