Ventilating, heating freeze-proofing design for boiler rooms of power plant in severe cold zone

The boiler in power plant in severe cold zone generally is enclosed with composite insulating profiled steel sheet, and such an enclosed structure is called a tight-enclosure boiler room. Considers that the main causes for lower indoor temperature and water pipe frost-crack in ground floor in the boiler room in winter are infiltration of cold wind by stack effect pressure. Suggests that it should be considered in design to ventilate in summer and heat for freeze-proofing in ground floor in winter. The sizes of steel grid, opening, stair on operating floor should be properly controlled to reduce infiltration in winter. Presents the design and application of circulating ventilation system in winter.