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Arsenic emission during combustion of high arsenic coals from Southwestern Guizhou, China

机译：黔西南地区高砷煤燃烧过程中的砷排放

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With the aim of better understanding the distribution of arsenic, 144 coal samples were collected from southwestern Guizhou, and the concentrations of arsenic were determined by atomic fluorescence spectrometry (AFS) and inductively coupled plasma mass spectrom-etry (ICP-MS). The content of arsenic varies from 0.3 ppm to 3.2 wt.%. In most coal samples, the arsenic content was lower than 30 ppm, which was close to a representative value of arsenic concentration of coal in China. Arsenic contents in 37 samples, which were from several small coal mines, were more than 30 ppm, among which only 16 samples were more than 100 ppm, and only a few samples contained more than 1000 ppm, which were very restricted and the coal seams were generally unworkable. Combustion of two kinds of high arsenic coal with and without CaO additive was studied in a bench scale drop tube furnace (DTF) to understand the partition and emission of arsenic in the process. The PM was size segregated by low pressure impactor (LPI) into 13 size stages ranging from 9.8 to 0.0281 m. X-ray fluorescence spectrometry (XRF) was used to determine the chemical composition of the PM, and inductively coupled plasma atomic emission spectrometry (ICP-AES) was used to determine the arsenic content. A bimodal mode distribution of the PM was formed during coal combustion; the large mode (coarse particle) was formed at 4.0 μm, and the other mode (fine particles) was at about 0.1 μm. A middle mode was gradually obvious in high temperature for both of the two coal combustions, which may have been derived from coagulation and agglomeration of metal elements vapors. More gaseous arsenic was formed in 50% oxygen content than 20% oxygen content. Arsenic in sulfide is easier to vaporize than as arsenate. Along with the increasing temperature from 1100 ℃ to 1400 ℃, the arsenic concentration in PM_1 increased from 0.07 mg/N m~3 to 0.25 mg/N m~3. With the addition of the calcium based sorbent, the arsenic concentration in PM, decreases sharply from 0.25 mg/N m~3 to 0.11 mg/N m~3. Thus, the calcium based sorbent is an effective additive to control the emission of arsenic during coal combustion.
机译：为了更好地了解砷的分布，从黔西南地区采集了144个煤样品，并通过原子荧光光谱法（AFS）和电感耦合等离子体质谱法（ICP-MS）测定了砷的浓度。砷含量为0.3ppm至3.2重量％。在大多数煤样品中，砷含量都低于30 ppm，这已接近中国煤中砷的代表性值。来自几个小煤矿的37个样品中的砷含量均超过30 ppm，其中只有16个样品中的砷含量超过100 ppm，只有少数样品中的砷含量超过1000 ppm，这些样品非常受限制，而且煤层通常是行不通的。在台式滴管炉（DTF）中研究了两种高砷煤在有无CaO添加剂的情况下的燃烧过程，以了解过程中砷的分配和排放。通过低压冲击器（LPI）将PM分离成13个尺寸级，范围从9.8到0.0281 m。 X射线荧光光谱法（XRF）用于测定PM的化学成分，电感耦合等离子体原子发射光谱法（ICP-AES）用于测定砷含量。煤燃烧过程中形成了PM的双峰模式分布。大模式（粗颗粒）形成为4.0μm，另一种模式（细颗粒）形成为约0.1μm。在两种煤燃烧中，高温都逐渐显现出一种中间模式，这可能是由于金属元素蒸气的凝结和附聚所致。 50％的氧气含量比20％的氧气含量生成更多的气态砷。硫化物中的砷比砷化物更容易蒸发。随着温度从1100℃升高到1400℃，PM_1中的砷浓度从0.07 mg / N m〜3增加到0.25 mg / N m〜3。随着钙基吸附剂的加入，PM中的砷浓度从0.25 mg / N m〜3急剧下降至0.11 mg / N m〜3。因此，钙基吸附剂是控制煤燃烧过程中砷排放的有效添加剂。

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