| 摘要 |
The invention relates to direct-flow water boilers. A boiler plant with gas burner is connected to heat consumer with supply and return pipelines with heating water pump. Gas discharge section has connected in parallel first and second branches, there gas cavities of the first and second heat exchangers, respectively are placed. Water cavity of first heat exchanger is connected to return pipeline between heating water pump and boiler. Water cavity of second heat exchanger is connected to return pipeline in parallel to water cavity of the first heat exchanger. Between the point of branching of parallel connection of water cavities of heat exchangers and second heat exchanger valve is installed. Part of water section between that valve and second heat exchanger is connected by pipeline in which valve is placed to reverse pipeline on suction side of heating water pump. Second branch of gas discharge section by motion of gases to the second heat exchanger is connected to air duct, and after second heat exchanger–to atmosphere. The plant has heater of output gases with gas and water cavities. Gas cavity of the heater is connected to gas discharge section. Water cavity is connected to supply and return pipelines. Presence of two heat exchangers promotes increase of efficiency of installation and is needed preliminary hearting of blast air in one of those. Heating of output gases prevents formation of condensate in chimney and increases reliability of operation of installation. |
