The furnace body of the vacuum hot water boiler is divided into upper and lower parts, of which the structure of the lower part is similar to that of the three-pass wet-back shell steam boiler, that is, the heating surface composed of the furnace and the flue; and the upper part is a vacuum chamber (negative pressure steam room), and a tube-type steam-water heat exchanger is installed in the space, which is used to heat the circulating water flowing through the heat exchanger.
Operating principle: When the vacuum hot water boiler is running, the heat medium water in the furnace body absorbs the heat energy released by fuel combustion under vacuum negative pressure, boils and vaporizes into low-temperature steam, and the low-temperature steam rises to meet the system circulating water in the stainless steel heat exchanger, heating Circulating water is sent to users for heating or sanitary hot water. The water vapor itself is cooled and condensed into water droplets that fall to the surface of the heat medium and then heated again, thus completing the entire cycle process. The heat medium water is constantly carrying out the "boiling-evaporation-condensation-heat medium water circulation" in the closed body, so there is no need to replenish condensed water, and there is no danger of empty burning. The steam-water condensation heat exchange used by the vacuum hot water boiler is used in all exchange In thermal conditions, the heat transfer coefficient of steam-water condensation heat transfer is high.
