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山东11选五杀号大全
电锅炉使用的除氧方法
2018-06-26 14:38
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        燃煤锅炉在实际使用运行中,热效率低,能源浪费大,排尘浓度大,煤的含硫量高,对大气污染严重。尤其是近年来,能源供需和环境污染的矛盾日益尖锐。而电锅炉的热效率高,对大气污染又低,有很好的环保性能。发达国家的山东11选五杀号大全占有相当大的比重,发展电锅炉是大势所趋。因此,我厂着重研究电锅炉。在这里,小编就带领大家一起来了解一下电锅炉在使用中怎样除氧。
        我们在使用电锅炉的过程中最常见的问题就是腐蚀问题,要解决电锅炉的腐蚀最重要的就是除氧。热力除氧一般有大气式热力除氧和喷射式热力除氧。其原理是将电锅炉给水加热至沸点,使氧的溶解度减小,水中氧不断逸出,再将水面上产生的氧气连同水蒸汽一道排除,还能除掉水中各种气体(包括游离态co,n)。节能型电锅炉除氧的方法不宜用大气式热力。
        电锅炉除氧后的水不会增加含盐量,也不会增加其他气体溶解量,操作控制相对容易,而且运行稳定,可靠,是目前应用最多的一种除氧方法。电锅炉除氧的方法不宜用大气式热力是为什么呢?原因是电锅炉流过的水量很大,直供系统这些水还要流过热力管道和散热器,其防止水侧腐蚀问题不仅涉及电锅炉,还涉及到整个热水供热系统。总之,山东11选五杀号大全的除氧问题有其特殊性,往往比蒸汽锅炉除氧存在的问题更多。电锅炉房无蒸汽源,故一般都不用大气式热力除氧。真空除氧可不用蒸汽加热,但要增设一套抽真空装置,并且系统要保持绝对严密;除氧器要设置在7~8米的楼层上,故也很少用。过去曾采用过氧化还原树脂除氧,其除氧效果好,水温可以较低。但初期投资较大,更为不利的是失效后要用含毒性的水合肼还原。加亚硫酸钠除氧,初投资较小,但加药物等运行费用较高;水质、水温、PH、的过剩量的变化,对除氧效果影响较大。
        对腐蚀介质进行处理是防止电锅炉腐蚀最常用的途径,它又可分为:(1)去掉介质中的有害成分;(2)在水中加入能减慢腐蚀的缓蚀剂。水中溶解的杂质,易使金属腐蚀的种类很多,尤其是溶解氧的存在,腐蚀特别严重。
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.