Why not use the boiler drum steel plate manufacturing to thin its thickness? Drum internal diameter utility boilers typically 1.6-1.8m, to withstand high pressure, so the drum wall is also thicker. High pressure boiler drum about the above wall thickness of about 100mm, a wall thickness of boiler drum Subcritical some of around 200mm, made of carbon steel or low alloy steel multi can weigh more than 100 tons or more. The main reason is not manufactured steel plate: (1) drum operating pressure is high, but the working temperature is the saturation temperature corresponding to a pressure, typically below 350 deg.] C, up to 364 deg.] C only, therefore, not necessary to use high-strength alloy steel. (2) a cold steel, hot workability, weldability especially much worse than steel. (3) The stress concentration factor than alloy steel. (4) alloy is expensive. For these reasons, the general carbon steel drum with high (20g, 22g) and low alloy steel (e.g., 16Mn) produced.
And at least two kinds of investment very effective in reducing steam boiler feedwater alkalinity and salt content of the sewage furnace purpose is to rid the excess amount of base in the water, salinity, and soft dirt and other impurities, the boiler water in the range of acceptable control indicators Inside. The implementation of a planned, scientific sewage, water holding furnace qualified, may slow or prevent the junction raw scale, priming, to ensure the quality of steam boilers and prevent metal corrosion, to ensure safe and economic operation of the boiler. How can both ensure the safe operation of boilers, and do not have a scale priming, while minimizing the amount of sewage it? This article describes two less investment and alkalinity and salinity of the water supply method is very effective in reducing. First, increasing the recovery rate of the boiler condensate return provided a single recovery tank underground, where the use of equipment to meet the hydrophobic port altitude level is below the requirements of the bins, so that all the condensate return gravity to the recovery tank, the recovery put a submersible pump in the tank, the recovered condensate pumped to the softening of the ground tank, the recovered condensate pumped to the softening of the ground tank. Strengthen the use of equipment and routine visits to check and manage the return line to reduce the steam condensate return water contamination problems. While strengthening the monitoring of the quality of the recovery tank, once found water hardness and pH change in the collecting tank, the tank should immediately stop, all the water will be pumped to the tank trench memory, a close look along the return line, the walls of corrosion replacement pipe restoration. Second, for those additional lime pretreatment apparatus boiler steam condensation can not be recycled backwater, lime pretreatment means can be added before sodium ion exchange, this is a boiler water alkalinity and salt content is reduced, thereby reducing boiler an effective method of emissions. Compared with sodium hydrogen ions water treatment methods in parallel, the process is simple, small-scale transformation equipment investment, low operating cost, it is suitable for small and medium sized boiler room used. Lime pretreatment principle lime water was added calcium hydroxide (milk of lime), and after calcium bicarbonate, magnesium, and the role of free carbon dioxide in water, to form a precipitate of insoluble materials, the softening, and the base portion down object desalination .
First, before running a check, check whether the flow line, the valve 2 is open, the boiler can not be installed on any air opening the valve, through the atmosphere. (Such as boiler pressure should be checked whether there are significant changes in the pipeline clogging) 3, expansion tank and through a large pipe freezing measures should be noted, not frozen. 4, the use of the heating season a year ago, need to check, clean water in the heating system, impurities.
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