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Demineralized water boiler industry in the application

2009-11-30 12:53:46

Demineralized water boiler industry in the application

A qualified boiler water treatment agent must effectively play anti-scaling gentle corrosion function. Two Anti-scaling mainly refers to the boiler corrosion and scale inhibitors, including boiler and steam pipe, through which water pipe heat exchanger and.

Ca2 +, Mg2 + is mainly a scale ion, on the market at present the most used by boiler with ion exchange, to get rid of them. But some other water soluble salts due to evaporation and concentration of water is still increasing concentration, beyond its solubility and scaling. Especially in high temperature, such as pipe smoke, because the water, very anxious fierce vaporization might cause some salt for local high concentration and crystallization precipitation. It is used in many demineralized water boiler scale. Still Although this kind of phenomenon can ease by increasing the amount of waste, but the hand of energy, on the other hand, because of the increased amount of water alkalinity, makes the pot often is lower than the national standard of floor, quicken the speed of corrosion. Therefore, the boiler water to take appropriate measures of anti-scaling is very necessary.

The dissolved oxygen in water is the main factor causing boiler corrosion. Due to the high temperature, oxygen and pan quickly reaction. For the boiler deaerator, adopting measures of chemical oxygen is necessary, for the boiler deaerator, because of the deaerator's oxygen can thoroughly, especially some of the continuous operation of the boiler, in every just when blow-in, thermal deaerator almost no effect, so take a chemical oxygen as a remedy is necessary.

Boiler corrosion caused by another major factor is Fe3 +. Now the office, hotel etc mostly adopts closed heating system, condensed reuse can be accounted for about 80% of the boiler make-up water, steam pipeline, pipe if condensate, heat exchanger etc. No necessary measures, pipeline corrosion of iron is dissolved into the surface water, because Fe3 + condensation has strong oxidizing, can greatly improve the boiler corrosion speed.

The CO2 gas boiler make-up water into the boiler water after being heated from escaping steam, heat exchangers, again into the condensed water, soluble in water become acidic. In acidic condition of iron, accelerate corrosion greatly condenses into water, iron, sometimes had to drop, because water condensation water temperature is higher, it would cause a waste of energy.

翻译:

软化水在锅炉行业的应用 
 
一种合格的锅炉水处理剂必须有效地起到阻垢和缓蚀两作用。阻垢主要是指对锅炉本体的阻垢,而缓蚀的对象包括锅炉本体以及蒸汽所通过的管道,热交换器和凝结水管道。

Ca2+、Mg2+是主要的成垢离子,目前市场上所使用的锅炉大都配有离子交换器来去除它们。但水中其它的一些溶解性盐类由于锅水的浓缩蒸发,浓度不断增大,仍有超出其溶解度而结垢的可能。特别是在烟管等高温部位,由于水的急烈汽化,很可能引起某些盐类因局部浓度过高而结晶析出。这就是许多使用软化水的锅炉仍结垢的原因。虽然这种现象可通过增加排污量得到缓解,但这一方面浪费大量的能源,另一方面由于排污量的增大使得锅水碱度下降,常常低于国家标准的下限,加快了腐蚀的速度。所以,对锅水采取适当的阻垢措施是十分必要的。

水中的溶解氧是造成锅炉腐蚀的主要因素。由于锅内温度高溶解氧与铁反应的速度很快。对于无除氧器的锅炉,采用化学除氧的措施是必不可少的,对于有除氧器的锅炉,由于目前的除氧器除氧不能彻底,特别是一些非连续运行的锅炉,在每天刚开炉时,热力除氧器几乎起不到作用,所以采取化学除氧作为一种补救方式也是必要的。

造成锅炉腐蚀的另一主要因子是Fe3+。现在的写字楼、宾馆等大都采用密闭式的加热系统,冷凝水回用可占锅炉补给水的80%左右,如果蒸汽管道,冷凝水管道,热交换器等部位无必要的缓蚀措施,管道表面的铁就溶解进入凝结水中,由于Fe3+具有较强的氧化性,可以大大加快锅炉腐蚀的速度。

锅炉补给水中的CO2气体进入锅炉后由于受热从水中逸出,随蒸汽一同进入热交换器,又重新溶解于冷凝水中,使水呈酸性。在酸性条件下铁的腐蚀大大的加快,大量铁溶入凝结水中,有时不得不把凝结水排掉,由于凝结水温度较高,这势必造成能源的大量浪费。 

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