A method for characterizing the volatilization characteristics of trace elements in coal
A technology of trace elements and coal combustion, which is applied in the field of characterizing the volatilization characteristics of trace elements in coal, and can solve the problems such as the complicated process of formulating coal blending and combustion schemes
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
However, the content of trace elements such as arsenic, selenium and lead in different coal types and the content of ash are different. At the same time, the distribution of mineral element content in ash is quite different. There is a large difference in the fixed capacity of each, and these variables complicate the process of formulating coal blending and burning schemes
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Embodiment 1
[0055] The present invention aims at the problem that it is difficult to determine the coal blending scheme when coal-fired power plants control the discharge of trace elements such as arsenic, selenium, and lead through coal blending and burning, and proposes a method for characterizing the volatilization of trace elements such as arsenic, selenium, and lead in coal. characteristic method, its specific implementation steps are:
[0056] (1) Carry out industrial analysis of coal with reference to the national standard "Methods for Industrial Analysis of Coal (GB / T 212-2008)". The result is based on the received basis of coal, and the ash content (wt.%) of coal is calculated: A ar .
[0057] This embodiment takes coal type A as an example, and the ash content of coal type A is A ar = 13.1%;
[0058] (2) To calculate the content of each mineral element in the coal ash, you can refer to the method in the literature "The influence of combustion heat release on the release of sod...
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The invention relates to a method for representing volatilization characteristic of trace elements inside fire coal, and belongs to the field of thermal power generating units. The method comprises the following steps: measuring the ash content of coal; carrying out ash component analysis, and measuring the content of each mineral element in coal ash; calculating the content of each mineral element in coal; obtaining the fixed coefficient of each mineral element for trace elements; calculating the total fixed coefficient of coal for trace elements; carrying out content analysis of trace elements of coal, and measuring the content of trace elements in coal; and calculating a volatilization index of trace elements of coal. The fixed coefficient of each mineral element for trace elements is obtained through an adsorbing capacity measuring method or a volatilization rate reduction proportion measuring method. According to the method, the volatilization characteristic of trace elements of different types of coal can be represented accurately and comprehensively. When the discharge of trace elements is controlled by a coal-fired power plant through a coal blending and blending combustion method, guidance is provided for the establishment of a coal blending scheme, and the operation of a coal blending and blending combustion system is optimized.
Description
technical field [0001] The invention belongs to the field of thermal power units, and more specifically relates to a method for characterizing the volatilization characteristics of trace elements in coal. Background technique [0002] Coal-fired power plants are an important source of emissions of trace elements such as arsenic, selenium, and lead. Due to their biological toxicity, trace amounts of arsenic, selenium, lead, etc. pose a major threat to the health of the public, and the existing technology cannot effectively control the discharge of trace elements such as arsenic, selenium, lead, etc., so new technical means are developed to It is of great significance to control the emission of trace elements such as arsenic, selenium and lead. [0003] Mineral elements in coal have a good fixation effect on trace elements such as arsenic, selenium, and lead. The content of trace elements and mineral elements in blended coal can be adjusted by technical means of coal blending...
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IPC IPC(8): G01N33/22
CPCG01N33/222
Inventor 张成许豪谭鹏袁昌乐余圣辉方庆艳陈刚
Owner HUAZHONG UNIV OF SCI & TECH