In practical operation, coal-fired boilers have low thermal efficiency, high energy waste, high dust discharge concentration, high sulfur content of coal and serious air pollution. Especially in recent years, the contradiction between energy supply and demand and environmental pollution has become increasingly acute. The thermal efficiency of electric boilers is high and the air pollution is low. Electric boilers in developed countries account for a large proportion of the development of electric boilers is the general trend. Therefore, our factory focuses on the study of electric boilers. Here, the small unit will lead you to understand how electric boilers in use to remove oxygen.
The most common problem in the process of using electric boilers is corrosion. The most important thing to solve the corrosion of electric boilers is to remove oxygen. Thermal deoxygenation generally has atmospheric heat deoxygenation and jet heat deoxygenation. Its principle is to put the electric boiler feed water heated to boiling point, reduce the solubility of oxygen, the oxygen constantly escape, then the water of oxygen along with steam out, also can get rid of the water of various gases (including free co, n). The method of deoxidizing energy - saving electric boiler is not suitable for atmospheric heat.
Electric boiler water doesn't increase salt content after the oxygen, also won't increase the other gas dissolved quantity, control is relatively easy to operation, and operation is stable, reliable, is the most used one kind of oxygen removal methods. The method that electric boiler deoxidizes should not use atmosphere type heat energy is why? Reason is that much water flows through the electric boiler, direct supply system the water through the heat pipe and heat sink, its prevent waterside corrosion problem not only involves the electric boiler, also involves the hot water heating system. In a word, the deoxygenation of electric boilers has its particularity, and there are more problems than that of steam boilers. There is no steam source in electric boiler room, so it is not necessary to use atmospheric heat to remove oxygen. Vacuum deoxygenation can not be heated by steam, but a set of vacuum pumping equipment should be added, and the system should be kept absolutely strict; Deoxidizer should be set on the floor of 7 ~ 8 meters, so it is rarely used. In the past, peroxide REDOX resin was used to remove oxygen. However, the initial investment is large, and the more unfavorable one is to use the toxic hydrazine hydrazine reduction after the failure. Sodium gallate deoxygenation, small initial investment, but high operating costs such as drugs; The changes of water quality, water temperature, PH and excess have great influence on the effect of oxygen removal.
The treatment of corrosive medium is the most common way to prevent corrosion of electric boiler. (2) add corrosion inhibitor to water to slow down corrosion. The impurities dissolved in water are easy to cause many kinds of metal corrosion, especially the existence of dissolved oxygen, especially serious corrosion.