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煤矸石循环流化床锅炉的微量元素分配行为:实验与平衡计算

Trace element partitioning behavior of coal gangue-fired CFB plant: experimental and equilibrium calculation.

作者信息

Zhang Yingyi, Nakano Jinichiro, Liu Lili, Wang Xidong, Zhang Zuotai

机构信息

Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China.

URS Corp., PO BOX 1959, Albany, OR, 97321, USA.

出版信息

Environ Sci Pollut Res Int. 2015 Oct;22(20):15469-78. doi: 10.1007/s11356-015-4738-6. Epub 2015 May 27.

Abstract

Energy recovery is a promising method for coal gangue utilization, during which the prevention of secondary pollution, especially toxic metal emission, is a significant issue in the development of coal gangue utilization. In the present study, investigation into trace element partitioning behavior from a coal gangue-fired power plant in Shanxi province, China, has been conducted. Besides the experimental analysis, thermodynamic equilibrium calculation was also conducted to help the further understanding on the effect of different parameters. Results showed that Hg, As, Be, and Cd were highly volatile elements in the combustion of coal gangue, which were notably enriched in fly ash and may be emitted into the environment via the gas phase. Cr and Mn were mostly non-volatile and were enriched in the bottom ash. Pb, Co, Zn, Cu, and Ni were semi-volatile elements and were enriched in the fly ash to varying degrees. Equilibrium calculations show that the air/fuel ratio and the presence of Cl highly affect the element volatility. The presence of mineral phases, such as aluminosilicates, depresses the volatility of elements by chemical immobilization and competition in Cl. The coal gangue, fly ash, and bottom ash all passed the toxicity characteristic leaching procedure (TCLP), and their alkalinity buffers the acidity of the solution and contributes to the low solubility of the trace elements.

摘要

能量回收是一种很有前景的煤矸石利用方法,在此过程中,防止二次污染,尤其是有毒金属排放,是煤矸石利用发展中的一个重要问题。在本研究中,对中国山西省一座煤矸石发电厂中微量元素的分配行为进行了调查。除了实验分析外,还进行了热力学平衡计算,以帮助进一步了解不同参数的影响。结果表明,汞、砷、铍和镉是煤矸石燃烧过程中的高挥发性元素,它们在飞灰中显著富集,并可能通过气相排放到环境中。铬和锰大多不挥发,富集在底灰中。铅、钴、锌、铜和镍是半挥发性元素,在飞灰中不同程度地富集。平衡计算表明,空气/燃料比和氯的存在对元素挥发性有很大影响。铝硅酸盐等矿物相的存在通过化学固定和对氯的竞争抑制了元素的挥发性。煤矸石、飞灰和底灰均通过了毒性特性浸出程序(TCLP),它们的碱度缓冲了溶液的酸度,并导致微量元素的低溶解度。

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