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Sampling device and testing method for sulfur trioxide in flue gas

A technology of sulfur trioxide and sampling devices, which is applied in the direction of sampling devices, measuring devices, and the preparation of test samples, can solve the problems of undetectable concentrations and low measured values, and achieve simple and efficient testing processes, improved accuracy, and The effect of improving accuracy

Active Publication Date: 2018-01-23
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the acid mist is not completely condensed in the collection tube and escapes, resulting in low measured values; on the other hand, the NaOH standard solution can only titrate acid solutions with comparable concentrations, which often leads to SO in the flue gas 3 Undetectable at low concentrations

Method used

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  • Sampling device and testing method for sulfur trioxide in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The concentration of sulfur trioxide in the flue gas was tested at the outlet of a denitrification device in a power plant.

[0046] according to figure 1 As shown, connect the sulfur trioxide sampling device. After the sampling device is connected, check the airtightness of the entire device.

[0047] Heat the electric heating sampling gun, secondary filter and high-temperature air pump to 210°C, then pour ice water into the ice bath container; pour 100ml, 50ml and 50ml of 80% isopropanol into the third-level absorption bottle to absorb Add 2-3 drops of thorium reagent and 0.1ml of barium perchlorate standard solution dropwise into the third-level absorption bottle, place a desiccant in the drying bottle, and place the third-level absorption bottles in an ice-water bath. The concentration of the thorium reagent solution is 0.2g / L, and the concentration of the barium perchlorate standard solution is 0.001mol / L. The color of the liquid in the first two absorption bott...

Embodiment 2

[0053] The concentration of sulfur trioxide in the flue gas was tested at the outlet of a desulfurization device in a power plant.

[0054] according to figure 1 As shown, connect the sulfur trioxide sampling device. After the sampling device is connected, check the airtightness of the entire device.

[0055] Heat the electric heating sampling gun, secondary filter and high-temperature air pump to 220°C, then pour ice water into the ice bath container; pour 100ml, 50ml and 50ml of 80% isopropanol into the third-level absorption bottle to absorb Add 2-3 drops of thorium reagent and 0.2ml of barium perchlorate standard solution dropwise into the third-level absorption bottle, place a desiccant in the drying bottle, and place the third-level absorption bottles in an ice-water bath. The concentration of the thorium reagent solution is 0.3g / L, and the concentration of the barium perchlorate standard solution is 0.001mol / L. The color of the liquid in the first two absorption bott...

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Abstract

The invention relates to a sampling device and a testing method for sulfur trioxide in flue gas. The sampling device comprises an electric heating flue gas sampling gun, a high-temperature air extracting pump and an ice bath absorbing device, wherein the ice bath absorbing device comprises an ice bath container, absorbing bottles and a drying bottle; a discharging pipe is communicated to the drying bottle; a cumulative flowmeter is arranged on a pipeline of the discharging pipe; isopropanol absorption liquid is in the absorbing bottles. According to the sampling device disclosed by the invention, upstream equipment on the ice bath device can be all heated; by controlling the temperature, condensation of the sulfur trioxide is effectively avoided, and accurate sampling is ensured; the wholetesting process of the testing method is simple and efficient; by treating a sample, the accuracy of ion chromatography to testing of sulfate ions is greatly improved, and the accuracy of a concentration test of the sulfur trioxide is improved.

Description

technical field [0001] The invention relates to the detection of flue gas components in coal-fired power plants, in particular to a sampling device for sulfur trioxide in flue gas and a testing method thereof. Background technique [0002] In addition to generating a large amount of SO in the combustion process of coal 2 In addition, a certain amount of SO will be generated 3 , although its content is relatively small, it is very easy to combine with water vapor in the flue gas to form sulfuric acid vapor. SO in flue gas 3 The higher the content, the higher the acid dew point temperature, which will not only condense and form acid liquid in the middle and low temperature section, which will lead to the sulfuric acid corrosion of the tail flue of the coal-fired power plant boiler and equipment, affecting the safe and stable operation of the unit, but also because the environmental protection equipment is harmful to SO 3 The low removal rate leads to an increase in the conc...

Claims

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Application Information

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IPC IPC(8): G01N1/24G01N1/34G01N30/96
Inventor 陈崇明李振海宋国升郁金星陈秋焦阳
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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