The basic principle of vacuum hot water boiler was born in 1972 at Zurich University of Technology. In 1975, TAKUMA Company of Japan developed a vacuum hot water boiler based on this principle, which was patented for invention. Later, it was gradually popularized all over the world. This technology was developed and developed by Korean enterprises, and Korean TAKUMA appeared one after another.
In the late 1980s, some domestic manufacturers developed vacuum hot water boilers. However, due to technical problems, it is mainly impossible to solve the problem of the continuous decrease of vacuum caused by the electrochemical reaction between water and iron under sealed vacuum condition, which has not been popularized. In the 1990s, Korean manufacturers entered the Chinese market relatively. Later, about 2003, domestic boilers began to produce vacuum boilers.
Working principle
Vacuum boiler is a vacuum environment with negative pressure inside the closed furnace body, which fills the body with heat medium water. Heat medium water is heated by combustion or other means to produce steam. Steam is heated by condensing heat exchanger tube to supply hot water.
Heat transfer indication of vacuum boiler:
Oil, Natural Gas, Gas, Electricity - > Combustion (Electrical Conversion Heat) > Heat Medium Water - > Steam Condensation Heat Transfer after Boiling - > Heat Exchanger - > Heat Conduction - > Water
The working principle of the vacuum boiler: by using the characteristics of low boiling point of water under low pressure, the heat medium water filled in the sealed furnace can be quickly heated, so that the heat medium water can boil and evaporate high temperature water vapor, and the water vapor condenses on the heat exchanger tube to heat the cold water in the heat exchanger tube, so as to supply hot water.
Standard sea level atmospheric pressure: 1.013 *105Pa=101.3 kPa, at which the boiling point of water is 100 C; the higher the altitude, the lower the atmospheric pressure, the lower the boiling point is:
The Qinghai-Tibet Plateau has an average altitude of 4000 m and atmospheric pressure of 62 kPa. At this time, the boiling point of water is 87 C.
Mount Qomolangma: 8848m above sea level, 33kPa atmospheric pressure, boiling point 71 C;
Vacuum boilers create a low-pressure environment with little air through vacuum pumping, and then use water to boil at low pressure (below atmospheric pressure).
The principle of heat output of steam through condensation heat transfer of steam and water works.
liquid nitrogen cryogenic box
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