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《垃圾焚烧厂最佳可用技术参考文件》2018年版 4.5章 第一部分(待续) 学习笔记(一)

2020-02-12 11:30来源:无锡华星东方电力环保关键词:烟气净化工艺除尘技术华星东方收藏点赞

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Description

4.5.2.2.1 说明

This technique relates to either one of the following cases:

该技术通常应用于如下某一种情况:

•dedusting associated with dry and semi-wet processes in order to capture at the same time as dust the salts produced by the reaction between acid gases and alkaline reagents.

下游除尘通常和干法或半干法(SDA)工艺相结合以同时便捕捉反应塔中由酸性气体和碱性脱酸剂生成的副产物和粉尘。

•the application of an additional flue-gas polishing system for the final reduction of dust emissions after other FGC components, before the final release of stack gases to the atmosphere.

应用作为一个额外的烟气抛光系统,为了最后在其他烟气净化系统工艺段后,通过烟囱排向大气前,实现粉尘排放的最后控制。(韩国麻蒲,荷兰代尔夫载尔。)

Technical description

4.5.2.2.2 技术说明

The main system used downstream of a dry or semi-wet FGC system is the bag filter.

干法或半干法烟气净化系统的下游通常使用的主除尘系统是布袋除尘。

The main systems used for flue-gas polishing are:

主除尘系统用于烟气抛光的主要有:

• bag filters;

布袋除尘器;

• wet ESPs;

湿式电除尘;

• electrodynamic Venturi scrubbers;

电动文丘里洗涤塔;

• agglo-filtering modules;

凝集过滤模块;

•ionising wet scrubbers. [ 74, TWG 2004 ]

离子湿法洗涤。

The individual techniques are described in Section 2.5.3.

单独的技术描述在2.5.3章节中。

The addition of a final wet flue-gas treatment system can also be considered a polishing treatment after other systems that deal with acid gases, etc. This addition is generally made to specifically control HCl and SO2 emissions where they are highly variable; PCDD/F and mercury can also be removed with the use of carbon-impregnated polymer (plastic) material and with the addition of hydrogen peroxide respectively. These additional techniques are described in Sections 4.5.5.7, and 4.5.6.5. [ 64, TWG 2003 ] [7, TWG 2017]

在其他脱酸等工艺后布置一道最终的湿式烟气处理系统,通常被认为抛光处理。这种设计是为了进一步控制HCL和SO2,因为他们的波动性较大。

Polishing devices are also implemented to remove lets (especially fine ones). They are generally implemented to prevent fouling in downstream devices such as an SCR system. [ 74, TWG 2004 ]

抛光设施也用于去除细小颗粒物(特别是超细粉尘)。他们通常用于防止下游设备(如SCR系统)的污染。

Achieved environmental benefits

4.5.2.2.3 获得环境效益

In addition to the further reduction of dust emissions, emissions to air of the following substances can also be reduced:

除了进一步减少了粉尘排放外,如下物质也随之减少排放:

•metals – as their emission concentrations are usually associated with dust removal efficiency;

金属—因为他们的排放浓度通常与粉尘的去除效率相关;

•mercury and PCDD/F – where carbon (usually with alkaline reagent) is added as an absorbent on bag filters;

汞和二噁英/呋喃—活性炭(通常和碱性吸收剂一起)作为附在布袋表面的吸收剂。

• acid gases – where alkaline reagents are added to protect bag filters.

酸性气体—碱性吸收剂被加入除尘器用于保护布袋。

The benefits of these additional reductions may be small where upstream techniques are already being applied to reduce the concentrations in the flue-gas to a low level.

如果上游工艺措施已经将烟气污染物浓度降低到一个非常低的水平,那么这种抛光除尘器所起到的作用就是很有限的了。

以上述案例应该就是作用很有限的代表了。


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