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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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Table 4.22: Operational data associated with the use of semi-wet FGC

Table 4.22: 半干法工艺相关的运行数据

Most systems consist of only a reagent mixing unit (reagent plus water) and a spray tower, and then a bag filter – complexity is therefore lower than with wet FGC systems.

大部分系统组成仅仅是一个吸收剂制备单元(吸收剂加水)和喷雾干燥塔,然后一个布袋除尘—系统复杂性低于湿法烟气系统。

The reagent handling and dosing require good management to ensure effective and optimised operation, particularly where heterogeneous waste types are treated, e.g. merchant HWIs.

吸收剂制备和给料需要非常好的管理来确保有效和优化的运行操作,特别是复杂工况的垃圾,如:商业HWIs(是不是危险废弃无?吃不准。)

Upstream HCl monitoring (see Section 4.5.3.9) improves optimisation of reagent dosing in these systems and allows management of peak loads of HCl, HF and SO2 without high reagent dosing rates.

上游HCL监测(详见4.5.3.9章节)改进了这些吸收剂计量的优化和使得对HCL,HF和SO2的峰值负荷管理不再需要很高的吸收剂使用量。

Some installations produce the Ca(OH)2 for the FGC system on site by slaking of CaO. Effective lime preparation can be critical to good operation, as can be controlling the risk of fouling in the injection device. The injectors have to be located and designed such that they can be easily maintained and/or replaced for cleaning. [ 74, TWG 2004 ]

部分烟气净化系统通过在现场增设装置,用CaO熟化制备Ca(OH)2。有效的石灰制备对良好的运行是非常重要的,也可以有效控制喷射装置的堵塞风险。喷射器的位置和设计必须使其易于维护和/或更换以便清理。

Bag filters require close monitoring and management to address bag damage and consequent releases. Differential pressure monitors are commonly used to indicate bag damage and monitor operation in general.

布袋除尘器需要密切的监测和管理,以便解决布袋破损和随后的粉尘超标。压差监测仪通常用于指示破袋和监测操作。

Temperature requirements are critical. Care is required to ensure dew point corrosion in the bag filter is avoided – inlet gas temperatures of above 130–140 °C are usually used. At temperatures below 130 °C there may be problems due to the hygroscopic nature of the CaCl2 formed. Reagents usually require a specific temperature for optimal reaction conditions.

运行温度是非常关键的。需要关注避开滤袋的露点腐蚀—除尘器入口烟气温度通常要高于130-140度。如果温度低于130度就会出现吸湿性的CaCl2。(二水,四水氯化钠?参见一下Niro的培训手册)吸收剂通常需要一个特殊的温度来达到最佳反应条件。

It is reported that there may be operational problems when semi-wet FGC systems are used with very highly acidic polluted raw gases as this can lead to an increased risk of filter clogging.

报告称当入口原烟气中酸性污染物浓度非常高时,半干法烟气净化系统使用会遇到很多操作问题,这将导致布袋糊袋的风险增加。

The operational complexity of reactors and bag filters used in semi-dry systems can itself be decreased further by the use of a degree of pre-dedusting, e.g. use of a single-stage ESP, or by using non-sticky bag materials (see also Section 2.5.3.5). This avoids the problems of:

通过设置一些预除尘,半干法系统中的吸收塔和布袋除尘的操作难度会有所降低,如:使用一级电除尘,或使用防粘材料的布袋(详见2.5.3.5章节)。这可以避免如下问题:

• sticking of some zinc (and similar salts with low melting temperatures); and

部分锌的粘念(和类似的低熔点盐类);和

•hygroscopic salts forming sticky layers on the surface of the reactor. [ 64, TWG 2003 ]

在反应器表面形成粘性层的吸湿盐。

Cross-media effects

4.5.3.2.5 跨介质影响(增加的能源消耗或其他影响)

Cross-media effects are identified in the following table.

跨介质影响在下表中显示。

Table 4.23: Cross-media effects associated with the use of semi-wet acid gas treatment

Table 4.23: 使用半干法脱酸工艺的跨介质影响


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