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For a once-through DC boiler, apart from the two disturbances of load and combustion rate, the amount of boiler feedwater will also have a certain impact on steam pressure. Since a DC boiler does not have a steam drum and its circulation ratio is 1, when the steam pressure drops, adjusting the combustion alone cannot meet the load requirements; increasing the feedwater quantity is necessary to maintain the balance between the boiler output and external load. For DC boilers, if during normal operation, for some reason the feedwater quantity increases while the fuel quantity remains unchanged, the main steam flow must increase. If at this time the external load has not changed, that is, the opening of the turbine control valve has not changed, it will inevitably lead to an increase in the outlet steam pressure of the boiler.

Technical Q&A for Baxi wall-hung boilers; Factors affecting the steam pressure changes in DC boilers

Reprinted from: Beijing Baxi Wall-Hung Boiler Repair Phone http://blog.sina.com.cn/baxibigualu.