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脫硫脫硝設(shè)備的損壞是怎么產(chǎn)生的?

除SO2外,燃煤還會(huì)產(chǎn)生少量的SO3。煙氣中SO3濃度為10-40ppm。由于煙氣中含有水(4%-12%),產(chǎn)生的SO3立即形成硫酸霧。當(dāng)溫度較低時(shí),硫酸霧凝結(jié)成硫酸,粘附在脫硫脫硝設(shè)備內(nèi)壁上,或溶解在洗滌液中。這是濕吸收器及相關(guān)設(shè)備嚴(yán)重腐蝕的主要原因。處理方法是采用耐腐蝕材料制作吸收塔,如不銹鋼、環(huán)氧玻璃纖維增強(qiáng)塑料、硬質(zhì)聚氯乙烯、陶瓷等。無(wú)論脫硫工藝如何,其環(huán)境效益顯著,但經(jīng)濟(jì)效益不確定。

In addition to SO2, coal combustion will also produce a small amount of SO3. SO3 concentration in flue gas is 10-40ppm. As the flue gas contains water (4% - 12%), SO3 generated immediately forms sulfuric acid mist. When the temperature is low, the sulfuric acid mist condenses into sulfuric acid, adheres to the inner wall of desulfurization and denitration equipment, or dissolves in washing solution. This is the main reason for the serious corrosion of wet absorber and related equipment. The treatment method is to use corrosion-resistant materials to make the absorption tower, such as stainless steel, epoxy glass fiber reinforced plastic, rigid polyvinyl chloride, ceramics, etc. Regardless of the desulfurization process, its environmental benefits are significant, but the economic benefits are uncertain.
許多脫硫方法都能獲得較高的脫硫效率,但脫硫能力不均勻并不是評(píng)判脫硫方法優(yōu)劣的惟一標(biāo)準(zhǔn)。除脫硫能力外,還取決于該方法的一般技術(shù)和經(jīng)濟(jì)狀況。
Many desulfurization methods can obtain high desulfurization efficiency, but the uneven desulfurization capacity is not the only standard to judge the advantages and disadvantages of desulfurization methods. In addition to the desulfurization capacity, it also depends on the general technical and economic conditions of the method.
一般來(lái)說(shuō),應(yīng)考慮以下幾個(gè)方面:一是脫硫能力需要滿足環(huán)保要求;選用的工藝和可靠的操作技術(shù);選擇投資低、運(yùn)行成本低的技術(shù);考慮廢物處理和二次污染:吸收劑需要有穩(wěn)定的來(lái)源、高質(zhì)量和低價(jià)格,這是一個(gè)非常重要的因素。
Generally speaking, the following aspects should be considered: first, the desulfurization capacity needs to meet the requirements of environmental protection; Select advanced technology and reliable operation technology; Select technologies with low investment and low operation cost; Consider waste treatment and secondary pollution: absorbent needs a stable source, high quality and low price, which is a very important factor.
相對(duì)而言,我國(guó)石灰石資源相對(duì)豐富、純度高、分布廣,但高純石膏的供應(yīng)非常困難。副產(chǎn)品的處理需要一個(gè)場(chǎng)地和一個(gè)購(gòu)物廣場(chǎng)作為誘導(dǎo)使用;所用煤的硫含量對(duì)脫硫工藝也有影響。選擇的重要因素需要是根據(jù)煤的含硫量來(lái)選擇合適的脫硫方法。
Relatively speaking, China's limestone resources are relatively rich, high purity and widely distributed, but the supply of high-purity gypsum is very difficult. The treatment of by-products requires a site and a shopping mall as inducement; The sulfur content of the coal used also has an impact on the desulfurization process. The important factor for selection is to select the appropriate desulfurization method according to the sulfur content of coal.

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