Method for testing calcium and magnesium content in limestone-gypsum wet desulphurization absorbent

A wet desulfurization and limestone technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of complicated operations, many operation steps, and failure to truly reflect the activity of absorbents. Composition and other issues, to achieve the effect of simple test method and saving manpower

Inactive Publication Date: 2013-12-18
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual operation of the FGD system, its slurry is weakly acidic, and only calcium and magnesium that can be dissolved in such an environment can participate in the reaction. Therefore, refer to the standard "GB / T3286.1-1998 Limestone, Dolomite Determination of Calcium Oxide and Magnesium Oxide by Chemical Analysis Method "Determination of calcium and magnesium content in limestone in the FGD system of a thermal power plant does not truly reflect the active components of the absorbent required by the FGD system
And the operation steps are many and complicated, which is unfavorable for the operation of the thermal power plant staff

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Sampling and drying. Sampling 1g of limestone with particle size less than 125μm from the limestone-gypsum wet desulfurization absorbent to be tested, accurate to 0.1mg, and drying;

[0025] (2) Slowly add acid. Pour the dried limestone obtained in step (1) into a 250ml beaker, add 2ml of water, cover the watch glass, and slowly add 10ml (1+1) hydrochloric acid into the cup at the mouth of the 250ml beaker for 1-2min Added inside;

[0026] (3), heating and boiling. Heat and boil the solution in the 250ml beaker for 2-3 minutes;

[0027] (4), cooling, constant volume. Cool the solution in the 250ml beaker that has been heated and boiled in step (3) to room temperature, pour it into a 250ml volumetric flask, and use deionized water to set the volume to the mark;

[0028] (5) Determination of calcium and magnesium.

[0029] (5) Determination of calcium content. Take 10.00ml of the dissolved solution obtained in step (4) after cooling to room temperature and then...

Embodiment 2

[0039] (1) Sampling and drying. Sampling 2g of limestone with particle size less than 125μm from the limestone-gypsum wet desulfurization absorbent to be tested, accurate to 0.1mg, and drying;

[0040](2) Slowly add acid. Pour the dried limestone obtained in step (1) into a 250ml beaker, add 3ml of water, cover the watch glass, and slowly add 10ml (1+1) hydrochloric acid into the cup at the mouth of the 250ml beaker for 1-2min Added inside;

[0041] Steps (3) to (6) are the same as in Example 1.

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PUM

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Abstract

The invention provides a method for testing calcium and magnesium content in a limestone-gypsum wet desulphurization absorbent. The method comprises the following steps: (1) taking a sample and drying; (2) slowly adding an acid; (3) heating and boiling; (4) cooling and obtaining a constant volume; (5) determining calcium and magnesium; and (6) processing data, wherein the step (5) comprises a step (5.1) of determining the calcium content and a step (5.2) of determining the total content of the calcium and the magnesium. According to the method, a hydrochloric acid solution is used for dissolving limestone to realize the aim of accurately representing active components of the absorbent of an FGD (Flue Gas Desulfurization) system. The method has the advantages that (1) a testing method for representing active components of the absorbent of the FGD system is simple, rapid and accurate; manpower, material resources and financial resources are saved; operation is facilitated; (2) the method is used for testing the calcium and magnesium content in the limestone-gypsum wet desulphurization absorbent of a thermal power plant so as to really reflect the condition of the active components of the absorbent needed by the FGD system of the thermal power plant.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for testing calcium and magnesium content in a limestone-gypsum wet desulfurization absorbent. Gas Desulphurization" abbreviation, its Chinese translation is "flue gas desulfurization".) The quality inspection of the absorbent in the system. Background technique [0002] In recent years, FGD, which uses limestone as absorbent, has been widely used in coal-fired thermal power plants in my country because of its mature technology and high desulfurization efficiency. Typically, limestone contains dolomite that does not participate in the chemical reactions of the FGD system. The content of calcium and magnesium in limestone is one of the important indicators of FGD. At present, the content of calcium and magnesium in the limestone of the FGD system of the thermal power plant is basically measured with reference to the standard "GB / T3286.1-199...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 周艳明杨小玲曲立涛
Owner STATE GRID CORP OF CHINA
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