SZL Coal-fired Assembly Steam Chain Grate Boiler

Rated capacity: 1~15t/h

Rated work pressure: 1.25~2.45Mpa

Adaptive fuel：Ⅱ.Ⅲ Bituminous coal

Application industry : industrial and mining enterprises, schools, hospitals, etc.

Main technical parameters of Double-drum Longitudinal-arranged Boiler（SZL Boiler）

1.    Structure introduction :

The boiler is a double-drum longitudinal natural circulation assembled water-tube boiler. The body is divided into two parts, the assembly body and the assembly grate. The combustion equipment adopts light chain grate, with stepless speed transmission device. The front, rear and two sides of the water-cooled wall are arranged in the furnace, and the water-cooled wall on both sides adopts dense tube bundles. The furnace is arranged with high and short front arch and low and long back arch, covering about 70 % of the length of the grate. The convection section uses a partition wall to fold the flue gas into three return journeys, and two ash removal holes are arranged. Cast iron economizer and heat pipe air preheater are arranged at the tail. The blower blows the cold air into the air preheater for preheating and then enters the inlet ducts on both sides of the boiler. It rises to the furnace through six independent grate air chambers. Each inlet duct is equipped with an adjustment door to make the air distribution adjustment on the grate simple.

The coal hopper is arranged in front of the combustion equipment, and the coal gate adopts a water-cooled cast steel serrated shape, which effectively increases the surface area of the coal seam and is conducive to the full combustion of coal.

The fuel enters the furnace combustion through the coal hopper device, and the high-temperature flue gas absorbed by the water-cooled wall of the furnace enters the cooling chamber. The flue gas is discharged into the cast iron economizer after heat exchange in the convection section, and then enters the heat pipe air preheater, and then passes through the dust collector. Finally, it is pumped by the induced draft fan from the chimney to the atmosphere.

2.Product features :

a. The heating surface of the assembled boiler body is arranged abundantly, the pressure rise is fast, the output is sufficient, the overload capacity is strong, the insulation layer is elegant, the heat loss is small, and the water-cooled wall is high aluminum light refractory brick, aluminum silicate fiber felt and rock wool, while the general manufacturers use concrete and perlite.

b. Grate adopts reinforced active grate, this kind of grate is specially designed for assembling boiler in our factory, pitch is 90 mm, width is 64 mm, the destructive test proves that the tensile strength of reinforced active grate is twice that of ordinary active grate, so as to ensure the safe and reliable operation of the grate.

c. The two sides of the main combustion zone of the grate are sealed by high aluminum heat-resistant ductile iron, while the general manufacturers are gray cast iron or ordinary hot cast iron.

d. Grate ventilation adopts independent sealed air chamber into the air on both sides, adjustable air device for grid adjustable air door, it is driven by umbrella gear rack and moving grid to adjust the wind, the grid all through the gold processing, so not only the operation is flexible and convenient, and through the cold state ribbon test, the uniformity of the adjustable air device in the width direction of the grate is very good, can well adapt to the needs of combustion, and the general manufacturers are used in the grate plate side plate open two holes butterfly adjustable air plate.

e. The ash falling device of the grate also adopts a push-pull grid ash falling device.

f. The bearing of the main shaft and the driven shaft of the grate adopts the double row short cylindrical adjustable bearing, while the general manufacturers use cast iron sleeve or copper sleeve.

g. The water-cooled serrated coal gate is adopted in the coal gate, which can not only loosen the coal seam but also increase the surface area of coal seam combustion, and correspondingly increase the coal-fired area of the grate. The practice in recent years has proved that the use of this kind of coal gate can make the coal fully burn. The use of different coal gates in the same boiler can obviously advance the burnout zone of coal by 500 ~ 1000mm, and the carbon content of slag is greatly reduced.

In summary, the assembled boiler of our company has unique characteristics. In 1989, the assembled boiler won the third prize of major scientific and technological achievements of Jiangsu Provincial Department of Machinery Industry. In 1997, the assembled boiler series won the first grade title of the Ministry of Machinery.