A three-pass wetback design has a rear water wall, which separates the primary heating surface of the combustion chamber from the rear tube sheet.The water jacket eliminates the need for a refractory walland rear door swing space behind the boiler, as well as costly refractory maintenance.
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The single drum boier refers to only one boiler drum in the boier. According to the placement of the boier drum, the single drum boier can be divided into vertical boier and horizontal boier. The common vertical single-drum boiers have WNS series boilers, and this boiers are widely used because of their high technical parameters and small footprint. The commonly used horizontal single drum boilers are DHL chain grate boilers. The fuel of this type of boier is mainly coal and biomass.
Double drum boiler can also be divided into vertical boier and horizontal boier. For the longitudinal double drum boier, they are SZL and SZS series boilers. In general, the structure is relative to the single drum and the horizontal boiler. This kind of boier is mainly suitable for industrial steam supply, central heating, peak load heat source and so on.
Chain grate boiler features: high in heat efficiency. Safe and reliable in running. Chain grate is a type of mechanical stoker for a boiler furnace, in which the grate consists of an endless chain that draws the solid fuel into the furnace as it rotates.
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