汞控制技术中的吸收剂喷射工艺

Sorbent Injection Technology for Mercury Control

向烟气中喷入像粉末状活性炭之类的吸收剂,是一种最简单和最成熟的控制燃煤锅炉汞排放的方法。在4个不同的燃烟煤和次烟煤的电厂开展的第一次吸收剂喷射实验计划,证明了活性炭喷射(ACI)在控制汞排放方面的有效性。由于具有以下优点,ACI技术尤其适合现有燃煤锅炉的汞排放控制：(1)投资成本低(＜3美元/kW)；(2)改造容易且耗时短,几乎无需机组停运；(3)不论烟煤还是次烟煤均适用；(4)当使用布袋除尘器时在较低的吸收剂喷射速率下就可达到90%以上的汞去除效率。

Injecting sorbent as powdered activated carbon into flue gas is one of the simplest and most mature approaches to controlling mercury emissions from coal-fired boilers. The first sorbent injection test program, which took place at four differents sites firing both bituminous and subbituminous coals, proved the effctiveness of activated carbon injection （ACI） at reducing mercury emissions. ACI technology is ideally suited for use on existing coal-fired boilers for the following reasons： （1） minimal capital cost （〈$3/kW）; （2） easy and fast retrofitting, incurring little or no unit downtime; （3） effectiveness on both bituminous and subbituminous coals; （4） 90% mercury removal at very low injection rates when used with a fabric filter.