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Detection method of mercury content in burning coal

A detection method and content technology are applied in the detection field of mercury content in coal combustion, which can solve the problems of high cost, inability to detect, and high requirements for equipment and operators, and achieve the effects of low cost and convenient detection.

Inactive Publication Date: 2010-09-22
CHONGQING UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing detection technology, it is usually only to use precision instruments to measure the total mercury content in coal, or to use gold amalgam enrichment and then use cold atomic absorption method to measure, the cost is relatively high, and the requirements for equipment and operators Higher, not suitable for the work of power plants, especially the detection of different forms of mercury in coal, so that the parameters of mercury removal in flue gas cannot be adjusted according to the raw coal of different origins, so as to achieve the best treatment effect

Method used

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  • Detection method of mercury content in burning coal
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Examples

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Effect test

Embodiment 1

[0027] In this embodiment, a batch of raw coals numbered HB3-1 from the Huaibei coalfield were obtained. In order to provide guiding parameters for the demercury treatment of its coal-fired flue gas, the method of the present invention was used to detect the mercury content in the raw coal numbered HB3-1 of the Huaibei coalfield. Proceed as follows:

[0028] 1) Pretreatment and sample preparation: use a grinder to grind the raw coal to 200 meshes, turn on the thermostat and set it at 110°C for 2 hours, then put the raw coal into the thermostat and heat at 110°C for 12 hours to obtain a raw coal sample.

[0029] 2) Preparation of reagents: A reagent: 1mol / L sodium acetate (C 2 h 5 COONa); B reagent: deionized water; C reagent: specific gravity is 1.47g / cm 3 Chloroform (CHCl 3 ) solution; D reagent: 15.3mol / L of HNO 3 , 12mol / L of HCL and 10mol / L of HF in a volume ratio of 3:1:1 mixture; E reagent: 15% HCl; F reagent: specific gravity of 2.89g / cm 3 Bromoform (CHBr 3 ) solu...

Embodiment 2

[0043] In this embodiment, a batch of raw coals numbered GZ-07 from Guizhou coalfields were obtained. In order to provide guiding parameters for the demercury treatment of coal-fired flue gas, the method of the present invention was used to detect the mercury content in raw coals numbered GZ-07 in Guizhou coalfields. Proceed as follows:

[0044] 1) Pretreatment and sample preparation: use a grinder to grind the raw coal to 150 mesh, turn on the thermostat and set it at 100°C for 2 hours, then put the raw coal into the thermostat and heat it at 100°C for 18 hours to obtain a raw coal sample.

[0045] 2) Preparation of reagents: A reagent: 1mol / L sodium acetate (C 2 h 5 COONa); B reagent: deionized water; C reagent: specific gravity is 1.55g / cm 3 Chloroform (CHCl 3 ) solution; D reagent: the HNO3 of 15.3mol / L, the HCL of 12mol / L and the HF of 10mol / L by volume ratio 3: 1: 1 mixed solution; E reagent: the HCl of 13%; F reagent: specific gravity is 2.76 g / cm 3 Bromoform (CHBr...

Embodiment 3

[0059] In this embodiment, a batch of raw coals numbered PDS-2 from the Pingdingshan Coalfield in Henan Province were obtained. In order to provide guidance parameters for the mercury removal treatment of its coal-fired flue gas, the method of the present invention was used to detect the mercury content in the PDS-2 numbered raw coals of the Pingdingshan Coalfield in Henan Province. ,Specific steps are as follows:

[0060] 1) Pretreatment and sample preparation: use a grinder to grind the raw coal to 50 meshes, turn on the thermostat and set it at 95°C for 2 hours, then put the raw coal into the thermostat and heat at 95°C for 24 hours to prepare raw coal samples.

[0061] 2) Preparation of reagents: A reagent: 1mol / L sodium acetate (C 2 h 5 COONa); B reagent: deionized water; C reagent: specific gravity is 1.21g / cm 3 Chloroform (CHCl 3 ) solution; D reagent: 15.3mol / L of HNO 3 , 12mol / L of HCL and 10mol / L of HF in a volume ratio of 3:1:1 mixture; E reagent: 10% HCl; F rea...

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Abstract

The invention provides a detection method of mercury content in burning coal, which adopts various of reagents and a common instrument to detect without expensive precise instruments or gold amalgamation to adsorb, so that the detection method is convenient to detect, has low cost, can detect mercury content in burning coal, and can detect the content of mercury of various forms by extracting step by step so as to solve the defect that trace element mercury in coal is difficult to detect. The detection of the mercury content in coal of various forms is favourable for judging the type of mercury pollutant in smoke and the migration rule and can guide to select the best desorption means to purify burning coal smoke. The method of the invention is especially suitable for detecting mercury content in power plant burning coal.

Description

technical field [0001] The invention relates to an auxiliary technology for coal-fired flue gas treatment in a power plant, in particular to a method for detecting mercury content in coal-fired coal. Background technique [0002] my country's coal production accounts for 37% of the world's total, and the proportion of coal combustion in the energy structure is as high as 75%. The pollutants SOx and NOx produced by coal combustion have already attracted widespread attention. Now the pollution of trace elements (such as Hg, Pb, As, Se, etc.) caused by coal burning is also attracting people's attention, especially the problem of mercury pollution caused by coal burning, and the emission of mercury from coal-fired power plants has become an important part of the ecological environment. largest source of mercury pollution. According to the estimates of the US Environmental Protection Agency, between 1994 and 1995, the United States emitted 150 tons of mercury due to human activi...

Claims

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Application Information

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IPC IPC(8): G01N31/00G01N31/02
Inventor 刘清才高威杨剑鹿存房董凌燕姚春玲文娟周茜马友光
Owner CHONGQING UNIV
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