The main features of the vacuum boiler (1) vacuum suction run, really not explode boiler, security is excellent. (2) steel boiler force the high temperature region, successful isolation of the high-pressure zone, so that the service life of the boiler prolonged 2-3 times, the design life of 30 years. (3) the overall design of scientific, rational, compact footprint saving 50-70%. (4) by heat exchange in a boiler body, overall efficiency of up to 91%, after starting the hot water may be provided within 70-80 deg.] C for 2-3 minutes, greatly reducing the warm-up period and reduce energy waste. (5) automatic control, can be implemented intelligence, or unmanned remote network control. (6) built-in stainless steel heat exchangers, water quality without any contamination. (7) Indirect cf. (boiler EHE + + + + the circulating pump installation costs) in the form of heat, the installation cost savings of more than 30-40%. High (8) efficiency, fast heating, good heat transfer, fuel cost savings of 20-30%.
Problems existing boiler which a vacuum tube bundle effect bunching effect is widely present in the heat exchanger shell, likewise, vacuum boiler is inevitable. Nusselt proposed an improved condensing heat transfer coefficient formula for 1916. However, due to many differences in bundle properties (heat medium) temperature is saturated, the surface tension outside the refrigerant, the corrected correlation will also be corrected based on experimental results. But again, the bundle effect is still inevitable. 2, it is difficult to maintain the degree of vacuum maintenance and control of the effect of vacuum, vacuum boiler born. When the vacuum boiler stability, the interior portion of the vapor in the vapor space for heat exchange bundle and condensed into a liquid, negative pressure environment part for maintaining a vacuum in the boiler. Theory, boiling and absorbing heat cold water evaporation eventually will be in equilibrium, with the actual amount of heat during operation, the vacuum pump to maintain the boiler typically require external pressure balance, control the heat required to maintain combustion stability of adjusting the water temperature. These external adjustable mechanical means to destroy the balance of the system itself, not only the vacuum boiler system more stable and unstable heat transfer process last longer. 3, exhaust loss if these two exist only in the vacuum boiler, improve energy efficiency research boiler eternal subject. Currently, most vacuum boilers are gas-fired boiler for the boiler, the exhaust gas loss of vacuum insulated with appropriate measures to become a major energy loss.
Boiler feed water is necessary to control item 1, suspension criteria: When the boiler feed water of the raw water from surface water, depending on the number of suspended solids and colloidal content in water, can be selected coagulation, sedimentation and filtration techniques; when the raw water is groundwater, general just filtration, which is high iron content, increased iron manganese sand filter measures. 2, standard hardness: mainly many ways to prevent or control fouling, hardness removal, lime softening, softening agents exchange, but the most common, is the best approach to ion exchange softening effect, newer methods nanofiltration is law. 3, dissolved solids standard: When the salinity pot of water reaches a certain limit, it will generate priming, resulting in a sharp deterioration in the quality of the steam boiler. Many water quality demanding industries, such as the electronics industry and power plants and other boilers with high pressure, dissolved solids of the water has more stringent requirements. Method of reducing dissolved solids generally referred to as desalting, the main methods are: ion exchange, electrodialysis, reverse osmosis, the traditional process to use an ion exchange method, a method for updating a reverse osmosis membrane method. 4, DO standard: DO is mainly to prevent the corrosion of the furnace and the duct, the general heat deaerator, there are other oxygen chemical, electrochemical oxygen, vacuum deaerator like. 5, PH value and alkalinity boiler water standards: when boiler water is alkaline (pH 10-12), in order to make the fouling substance becomes slag to clear. Commonly used dosing method. 6, the relative standard alkalinity: primarily prevents the generation of caustic embrittlement. - scale boiler cleaning equipment, boiler feed water equipment, boiler water softening equipment, boiler desalted water softening device 7, the standard oil content: boiler water is mainly to prevent foaming, with formation of oily scale. Techniques employed degreasing water separator and the like. In cities and towns, the boiler feed water is generally tap water as raw water, drinking water according to the national standard, which turbidity is not more than 5, the total dissolved solids <1000mg / l, PH = 6.5-8.5, no oil, generally only the hardness of the boiler does not meet the standards water supply requirements, for industrial low-pressure boilers and hot water boilers, only the configuration softening process.
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