The water-fire tube coal fired boiler is a new type of three-return water-fire tube mixed boiler developed by our company to meet the needs of the market. The heating surface of convection tube bundle is arranged on the left side of the water-fire tube boiler, and the threaded tube is used in the drum. Double-sided water wall and low and long rear arch with short and high front arch are arranged in the furnace. Mechanical chain grate is adopted and 3-4 independent air storehouses are equipped. And equipped with blower, induced draft fan, coal machine, slag removal machine and other auxiliary equipment to achieve mechanized automatic operation.
When the coal fired steam boiler runs, the fuel falls on the grate from the coal hopper, and gradually burns with the grate moving. Under the coordination of the front and rear arches, the flame forms a fierce combustion swirl. The flue gas enters the convection tube bundle from the upper combustor of the rear arch, through the side smoke chamber, the front smoke chamber into the threaded smoke pipe, then through the dust collector, and finally discharged to the atmosphere by the induced draft fan through the chimney.
Water-fire tube boiler uses high-efficiency heat transfer threaded smoke pipe placed in the boiler shell. Compared with the form of pipe row heating surface placed in the flue, it is bound to be very compact, so that the size of the boiler is reduced, the cost of the boiler room decreased significantly. Doubled the heating capacity of some existing boiler rooms. When the average smoke speed in the tube of this series of coal-fired boilers is designed reasonably, the output and thermal efficiency of the boilers will not decrease with the extension of the operation period because there is basically no ash accumulation during operation. Even under the condition of less than half of the load, soot may accumulate at the tail of the smoke pipe, but it is less than that of the dense exhaust pipe, and it is easy to remove. A large number of high-efficiency heat transfer threaded pipe is immersed in the boiler water, and the external 1/3 ~ 1/2 area of the boiler shell is directly affected by fire, so that the heating time of the boiler water is significantly shortened than that of the water pipe boiler.
This series of boiler products furnace has a large volume, so that the furnace has an obvious ash reduction ability, the last part of the furnace flue gas turning room into a dust settling room, enough to meet the original dust concentration requirements of the boiler. The coal fired steam boiler adopts the threaded smoke pipe to strengthen the heat transfer, improve the heat transfer coefficient, reduce the volume of the boiler, reduce the user’s cost. Outlet water temperature ≤130℃ hot water boiler does not have a tail heating surface, steam boiler only horizontal layout of air preheater or economizer, so that the boiler room smoke, air duct layout simplification. The air preheater is equipped with superconducting heat pipe, which maximizes the use of waste heat, improves the thermal efficiency of the boiler and reduces the user’s cost.
Water-fire tube boiler adopts refractory concrete integral casting new technology, the integral sealing is good. The series of boiler heat loss less, durable. Compared with water tube boiler, the height of boiler room can be reduced obviously. Zozen Boilers exports is distributed to Malaysia, South Africa, Russia, Mongolia, Korea, Vietnam, Myanmar and Southeast Asian countries.