问题：半干法脱硫（国外技术）
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提问：ag63
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时间：2006-02-15 14:12:34 编辑加入/取消收藏订制/取消短消息举报该贴

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Semi-dry systems, or spray dryers, inject an aqueous sorbent slurry similar to a wet system, however, the slurry has a higher sorbent concentration. As the hot flue gas mixes with the slurry solution, water from the slurry is evaporated. The water that remains on the solid sorbent enhances the reaction with SO2. The process forms a dry waste product which is collected with a standard particulate matter (PM) collection device such as a baghouse or ESP. The waste product can be disposed, sold as a byproduct or recycled to the slurry. 半干系统,或喷雾烘干机,喷射一种类似于湿式系统的含水吸着剂泥浆。然而,其泥浆的吸着剂浓度却更高，当热的废气与泥浆溶剂混合时,水从泥浆中蒸发。保留在固状吸着剂的水提高了与二氧化硫的反应效率。这过程形成了能够使用诸如布袋或静电除尘器的标准微粒收集装备回收的干燥废品。废品可以被处理,作为副产品销售或回收为泥浆。 Various calcium and sodium based reagents can be utilized as sorbent. Spray dry scrubbers typically inject lime since it is more reactive than limestone and less expensive than sodium based reagents. The reagent slurry is injected through rotary atomizers or dual-fluid nozzles to create a finer droplet spray than wet scrubber systems . 各种钙基和钠基的试剂可以被用来作为吸着剂。喷雾干燥净化器典型地注射石灰，原因在于其与石灰石相比，更加容易发生反应；与钠基的试剂相比，成本又相对低廉。试剂泥浆通过转台式雾化器或双重流体喷管进行喷射，形成比湿式净化器系统更优良的滴状喷雾。 The performance of a lime spray dry scrubber is more sensitive to operating conditions. A “close approach” to adiabatic saturation temperature is required to maximize the removal of SO2. However, excess moisture causes the wet solids to deposit on the absorber and downstream equipment. The optimum temperature is 10 ℃ to 15 ℃ (20°F to 50°F ) below saturation temperature. Lower L/G ratios, approximately 1:3, must be utilized due to the limitation on flue gas moisture . Flue gas with high SO2 concentrations or temperatures reduce the performance of the scrubber . 石灰喷雾干燥洗气器的性能对操作条件更为敏感。要达到最大的二氧化硫去除效率，必须采用对隔热饱和温度的 “ 接近模式 ” 。然而 , 过高的湿气将导致湿固体在吸收体和顺流设备上( 内 )沉淀。最佳温度是在饱和温度以下 10 ℃ 到 15 ℃ (20 °F 到 50°F) 。由于对废气湿度的限制，必须采用更低的 L/G 比率 , 即接近 1:3 。含有较高二氧化硫含量或者温度的废气将降低洗气器的性能。 SO2 control efficiencies for spray dry scrubbers are slightly lower than wet systems, between 80% and 90% due to its lower reactivity and L/G ratios. Application of a single spray dry absorber is limited to combustion units less than 200 MW (2,000 MMBtu/hr) . Larger combustion units require multiple absorber systems. The capital and operating cost for spray dry scrubbers are lower than for wet scrubbing because equipment for handling wet waste products is not required. In addition, carbon steel can be used to manufacture the absorber since the flue gas is less humid. Typically applications include electric utility units burning low- to medium- sulfur coal, industrial boilers, and municipal waste incinerators that require 80% SO2 control efficiency . 喷雾干燥洗气器的二氧化硫控制效率略低于湿式系统 , 在 80% 和 90% 之间，原因在于其稍低的反应性和 L/G 比率。单一体喷雾干燥吸收体的应用局限于低于 200 兆瓦 (2,000 MMBtu/hr) 燃烧单位。更大的燃烧单位要求时需要多个吸收体系统。喷射干燥洗气器的资金和运营成本低于湿式净化器，原因在于其不需要处理湿废品的设备。另外 , 由于废气并不潮湿，碳钢可能被使用制造吸收体。典型地应用包括燃烧低到中等硫含量煤的电力单位、工业锅炉 , 和要求 80% 二氧化硫控制效率的市政废物焚烧炉。

回复人：zlhlhy,▲▲▲ (化工资源有效利用。包括石油化工新技术、精细化学品开发、废弃物资源化等。) 时间：2006-02-15 15:04:49 编辑	1楼
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回复人：dianfudota,▲ (学习) 时间：2011-09-30 10:10:46 编辑	2楼
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回复人：dianfudota,▲ (学习) 时间：2011-09-30 10:10:51 编辑	3楼
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