Hot water boiler system resistance, insufficient air supply: the reason is that the fuel particle size mixing, pulverized coal occupies the lump coal gap, into the grate by the gate extrusion dense, poor permeability, one is a large lump coal can not be burned through to the slag discharge is still red-hot, burned slag blocking parts, slag residual carbon is high; two is a serious coal leakage of pulverized coal; three is a large resistance, increasing the load of the blower, induced draft fan, high power consumption. Low furnace temperature poor coal quality and combustion conditions, low furnace temperature, sometimes even fire, a large number of unburned material and ash dust will be economizer and air preheater blockage, so that the furnace is in positive pressure combustion.

Hot water boiler will be part of the reheater heating surface arranged in the higher smoke temperature region, so that the superheater requires a substantial increase in the heating area. In order to reduce the resistance to flow when the work mass flows through the superheater and increase the rigidity of the tube, the superheater uses a larger diameter tube. In order to increase the proportion of radiation heat absorption in the superheater system, so that the superheater vapor temperature characteristics of the smooth, in the upper part of the boiler chamber is arranged in a radiant separating screen superheater and semi-radiant rear screen superheater. Which separates the screen superheater along the width of the furnace chamber arranged in a large area, each piece by a small screen, which not only plays a role in increasing the role of radiant heat transfer, but also play a role in blocking the rotating smoke gas flow to reduce the width of the chamber into the superheater to reduce the role of the flue gas temperature deviation.