Method for simultaneously measuring heavy metals with different forms in coal-fired flue gas

A coal-burning flue gas and heavy metal technology, which is applied in the preparation of test samples, measuring devices, sampling devices, etc., can solve the problems of inability to distinguish different forms, cumbersome operations, and heavy workload, so as to reduce labor and large consumption of reagents , Improve the analysis accuracy, the effect of reliable data support

Inactive Publication Date: 2013-06-12
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

If it is necessary to measure different heavy metals in coal-fired flue gas, these determination methods must be carried out separately, which is not only cumbersome to operate, but also requires a lot of work; and it cannot distinguish between different forms

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  • Method for simultaneously measuring heavy metals with different forms in coal-fired flue gas

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Embodiment 1

[0045] At present, most coal-fired power plants in my country have installed flue gas purification devices such as desulfurization and dust removal or denitrification. The composition of flue gas in different locations is different, which may affect the concentration of heavy metals in flue gas. Therefore, choose different locations of typical power plants in my country to burn coal Experimental study of flue gas.

[0046] 1. Sample collection

[0047] A. Preparation before sampling

[0048] Weigh several 200 to 300 g portions of silica gel to the nearest 0.5 g in an airtight container. Record the total weight of the silica gel plus the container on each container; alternatively, weigh the silica gel directly in the 8 Absorber Vial immediately prior to assembling the sample collection system components.

[0049] Dry the filter holder at a temperature of 20 ± 5.6°C (68 ± 10°F) and ambient pressure for 24 to 36 h, weigh at least every 6 h until constant weight, and record the r...

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Abstract

The invention provides a method for simultaneously measuring heavy metals with different forms in coal-fired flue gas. The method comprises the steps that coal-fired flue gas samples are collected through a sample collection system; the sample collection system comprises a sampling pipe with a suction nozzle, and a filtering bracket and a cyclone separator arranged in a hot box which are connected in sequence, and absorption bottles arranged in an ice-bath, which are connected in sequence through ducts, wherein a potassium chloride solution is contained in the first, second and third absorption bottles; an acid hydrogen peroxide solution is contained in the fourth and fifth absorption bottles; hydrogen potassium permanganate solution is contained in the sixth and seventh absorption bottles; silica gel is contained in the eighth absorption bottle; absorption liquid samples in all the absorption bottles are subjected to sample recovery after sample collection, and flue gas samples are subjected to sealing storage; absorption liquid samples in all the absorption bottles are subjected to sample digestion; and then all the digested samples are detected, and the concentrations of heavy metals with different forms in the flue gas are calculated according to measured contents of the heavy metals in all the absorption liquid samples.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for monitoring pollution sources, more specifically, a method for simultaneously monitoring different heavy metals in different forms in coal-fired flue gas. Background technique [0002] With the rapid development of my country's economy, heavy metal pollution is becoming more and more serious. According to incomplete statistics, from 2005 to 2009, there were 39 heavy metal pollution incidents across the country, especially since 2009, there were more than 20 serious heavy metal pollution incidents in Fengxiang County of Shaanxi, Wugang City and Liuyang City of Hunan Province. Heavy metals (specific gravity > 5.5g / cm 3 ) pollution has the characteristics of long-term, cumulative, latent and irreversible, which poses a serious threat to human health and has aroused great concern from the academic circles and the government of our country. [0003] Coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N21/73G01N1/24G01N1/28G01N27/626
Inventor 邓双张凡刘宇王相凤曹晴张辰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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