公开(公告)号：US5567226A

公开(公告)日：1996-10-22

申请号：US338362

申请日：1994-11-14

申请人： Aziz A. Lookman ,  Roger W. Glickert ,  James E. Gabrielson

发明人： Aziz A. Lookman ,  Roger W. Glickert ,  James E. Gabrielson

IPC分类号： B03C3/013

CPC分类号： B03C3/013

摘要： The present invention provides an apparatus and method to improve the performance of a variety of particulate collection devices. Gaseous ammonia is injected by one or more injectors into a waste gas upstream from a particulate collection device. The amount of ammonia injected from each injector is controlled so that the local concentration of ammonia in the waste gas is approximately the same as the corresponding local concentration of sulfur trioxide in the waste gas. The flow of ammonia from each injector is controlled by measuring several local sulfur trioxide concentrations in the waste stream after the ammonia has been injected. The sulfur trioxide can occur naturally or result from injection. By keeping the concentration of ammonia approximately equal to the concentration of sulfur trioxide, ammonia and sulfur trioxide react to form a liquid product. This liquid reaction product coats the surfaces of particles entrained in the gas stream. Once coated, the particles' electrical conductivity is altered so that they are more easily collected by devices employing electrostatic attraction. The liquid coating also causes the particles to agglomerate and these larger agglomerates are easier to collect.

摘要翻译： 本发明提供了改善各种颗粒物收集装置的性能的装置和方法。 气体氨由一个或多个喷射器注入到从颗粒收集装置上游的废气中。 控制从每个喷射器喷射的氨的量，使得废气中的氨的局部浓度与废气中相应的局部三氧化硫浓度大致相同。 通过在注入氨后，通过测量废物流中的几种局部三氧化硫浓度来控制来自每个注射器的氨的流动。 三氧化硫可以自然发生或由注射产生。 通过保持氨的浓度近似于三氧化硫的浓度，氨和三氧化硫反应形成液体产物。 该液体反应产物涂覆夹带在气流中的颗粒的表面。 一旦被涂覆，颗粒的导电性被改变，使得它们更容易地被采用静电吸引的装置收集。 液体涂层还使颗粒附聚，并且这些较大的聚集体更容易收集。