What are the reasons for the large resistance of the hot water boiler system
Release time:
2022-10-25
The hot water boiler system has large resistance and insufficient air supply: the reason is that the fuel particle size is mixed, the pulverized coal occupies the gap of the lump coal, and is squeezed and compacted by the gate when entering the grate, and the air permeability is poor. There is still a red fire, the slag blocking parts are burned, and the residual carbon content of the slag is high; the second is the serious leakage of pulverized coal; the third is the large resistance, which increases the load of the blast and induced draft fan, and the power consumption is high. The furnace temperature is low, the coal quality is poor and the combustion condition is not good, the furnace temperature is low, and sometimes even fires out, a large number of unburned materials and ash powder block the economizer and air preheater, so that the furnace is in positive pressure combustion.
The hot water boiler arranges a part of the reheater heating surface in the higher smoke temperature area, which greatly increases the heating area required by the superheater. In order to reduce the flow resistance when the working medium flows through the heater and increase the rigidity of the tube, the superheater adopts a larger diameter tube.
In order to increase the ratio of radiant heat absorption in the Hot water boiler system and to stabilize the steam temperature characteristics of the superheater, a radiant partition screen superheater and a semi-radiant rear screen superheater are arranged on the upper part of the boiler furnace. Among them, the partition screen superheater is arranged with large pieces along the width of the furnace, and each piece is composed of a small screen, which not only plays the role of increasing radiation heat transfer, but also blocks the rotating flue gas flow to reduce the entry into the furnace of the superheater. The effect of the smoke temperature deviation in the width direction.
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