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本文提供了一种不用水蒸气的大气式热力除氧方法,适用于锅炉及蒸汽发生器的给水除氧。本方法的原理是利用≥125℃的工艺余热,经换热器将压力大于39×10~4Pa(4kg/cm~2)的除盐水或软化水加热到高于除氧压力下的沸点。除盐水或软化水进入除氧器后,因压力降低而沸腾,从而达到除氧目的。本方法与利用工艺余热产生蒸汽,再用蒸汽加热除盐水的方法相比,相当于把工艺余热热源的温位提高了60—70℃,节约了大量高温位余热或燃料。本方法为利用石油、化工企业中大量难于回收的150℃以下的热源开辟了新途径。
This article provides a non-atmospheric air thermal oxygen scavenging method, suitable for boiler and steam generator water oxygen. The principle of the method is to use the residual heat of process of ≥125 ℃ and heat the demineralized water or demineralized water with the pressure greater than 39 × 10 ~ 4Pa (4kg / cm ~ 2) to the boiling point higher than the deoxygenation pressure by the heat exchanger. Demineralized water or demineralized water into the deaerator, due to lower pressure and boiling, so as to achieve the purpose of oxygen. Compared with the method of using steam to heat desalted water, the method is equivalent to increasing the temperature of the process waste heat heat source by 60-70 DEG C and saving a large amount of residual heat or fuel at a high temperature. The method opens up a new way for using a large amount of heat sources below 150 DEG C which is difficult to be recovered in petroleum and chemical industries.