公开(公告)号：EP2905064A1

公开(公告)日：2015-08-12

申请号：EP15151522.8

申请日：2015-01-16

申请人： URS Corporation

发明人： Gray, Sterling M. ,  Jarvis, James B. ,  Kosler, Steven W.

IPC分类号： B01D53/64

CPC分类号： B01D53/50 ,  B01D53/507 ,  B01D53/64 ,  B01D2251/108 ,  B01D2251/304 ,  B01D2251/60 ,  B01D2251/604 ,  B01D2251/606 ,  B01D2257/602 ,  B01D2258/025 ,  B01D2258/0283 ,  B01D2259/124 ,  B01D2259/128

摘要： Processes and methods exist for decreasing emissions of mercury upon combustion of fossil fuels such as coal. Halide salts can be effective when used at locations where they are thermally decomposed to form reactive halogen species, or in combination with an adsorbent material such as activated carbon. Halide salts, such as calcium bromide and sodium bromide, are not typically used at locations downstream of the economizer, where the temperature is typically below around 500 °C, because these salts are non-thermolabile and do not decompose to produce reactive halogen species. However, in flue gas streams that certain flue gas constituents, such as sulfur trioxide or sulfuric acid, reactive halogen species can be produced via chemical reaction. These species react with elemental mercury through various means to form an oxidized form of mercury that is more easily captured in downstream pollution control devices such as particulate control devices or SO2 scrubbers.

摘要翻译： 存在用于减少化石燃料（如煤）燃烧时汞的排放的方法和方法。 卤化物盐在用于热分解形成活性卤素物质的位置使用时，或与吸附剂材料如活性炭组合时可以是有效的。 卤化物盐，例如溴化钙和溴化钠，通常不用于节能器下游的位置，因为这些盐通常低于约500℃，因为这些盐是不耐热的，并且不分解产生反应性卤素物质。 然而，在烟道气流中，某些烟道气成分如三氧化硫或硫酸可通过化学反应产生反应性卤素物质。 这些物质通过各种手段与元素汞反应，形成氧化形式的汞，更容易在下游污染控制装置如微粒控制装置或SO2洗涤器中捕获。