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Method for detecting ammonia escape of flue gas denitrification system

A detection method and ammonia escape technology are applied in the field of flue gas denitrification of coal-fired boilers, which can solve problems such as affecting the stability of monitoring results and the inability of analyzers to work normally.

Active Publication Date: 2013-07-17
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ammonia measuring instrument of the laser method will be affected by the interference of smoke and dust; in addition, the flue will expand during the process of starting and stopping the boiler and the load changes, or the vibration caused by other reasons will make the laser ammonia measuring instrument require probes on both sides Unable to center, causing the analyzer not to work normally and affecting the stability of the monitoring results

Method used

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  • Method for detecting ammonia escape of flue gas denitrification system
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  • Method for detecting ammonia escape of flue gas denitrification system

Examples

Experimental program
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Effect test

Embodiment 1

[0079] NH to be purchased 4 + The standard solution was diluted and prepared to obtain standard solutions with a mass concentration of 0.2mg / L, 1.0mg / L, 2.0mg / L, 4.0mg / L and 10.0mg / L, and the above series of concentrations of NH 4 + The standard solution was detected by ion chromatography, the inhibition current detected by ion chromatography was 59mA, the quantitative loop volume was 10μL, the separation column was CS12A-4×250mm cation separation column, the elution method was isocratic elution, and the flow rate of the eluent was 1.0mL / min, the column temperature is 30°C, the cell temperature is 35°C, and the column pressure is 1200psi;

[0080] The standard solution of each concentration was detected in parallel 3 times to obtain the corresponding peak areas of the standard solutions of each concentration, and then the concentration-peak area curve was fitted by the least squares method for calibration to obtain the NH 4 + standard curve.

Embodiment 2

[0082] Weigh 2.0000g of fly ash samples to be tested under 7 working conditions respectively, place them in a beaker, and then add 40g of deionized water to it to obtain a fly ash sample solution;

[0083] A hydrochloric acid solution with a mass fraction of 20% is placed in a potentiometric titrator, and then the pH value of the fly ash sample solution is controlled between 6.0 and 6.8 with the potentiometric titrator, and the sample solution is stirred at the same time;

[0084] After stirring for 2 hours, let the sample solution stand still, and continue to use the potentiometric titrator to control the pH value of the solution between 6.0 and 6.8 during the stirring process;

[0085] The supernatant after standing still was placed in an ion chromatograph for detection, the inhibition current detected by ion chromatography was 59 mA, the volume of the quantitative loop was 10 μL, the separation column was CS12A-4×250mm cation separation column, and the elution method was iso...

Embodiment 3

[0092] Weigh 1.0000g of the fly ash sample to be tested under working condition 1, place it in a beaker, and then add 20g of deionized water to it to obtain a fly ash sample solution;

[0093] A hydrochloric acid solution with a mass fraction of 20% was placed in a potentiometric titrator, and then the pH value of the fly ash sample solution was controlled at 6.0 with a potentiometric titrator, while the sample solution was stirred;

[0094] After stirring for 2 hours, let the sample solution stand still, and continue to use the potentiometric titrator to control the pH value of the solution between 6.0 and 6.8 during the stirring process;

[0095]Put the supernatant after standing still in an ion chromatograph for detection, the inhibition current detected by ion chromatography is 59mA, the quantitative loop volume is 10μL, the separation column is CS12A-4×250mm cation separation column, and the elution method is isocratic For elution, the eluent flow rate is 1.0mL / min, the c...

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Abstract

The invention provides a method for detecting ammonia escape of a flue gas denitrification system. The method includes that flying ash of a first electric field ash hopper of an electrofilter serves as a detection object. Researches show that by analyzing, an excellent linear relationship is existed between ammonia escape converted by ammonia content in first electric field flying ash of the electrofilter and ammonia escape of the flue gas denitrification system, the flying ash of the first electric field ash hopper of the electrofiler is mixed with water to obtain to-be-detected sample solution, the water-to-ash ratio is controlled to be (20-100):2 while the pH (potential of hydrogen) value of the to-be-detected sample solution is controlled to be 6.0-6.8, most of and even all of ammonia in the flying ash is enabled to be solved in the water without ammonia escape, and accordingly an accurate result is obtained. Therefore, the detection result, obtained by the method, of ammonia escape of the flue gas denitrification system is more accurate, and is stable as not being affected by equipment failure.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification of coal-fired boilers, in particular to a method for detecting ammonia escape in a flue gas denitrification system. Background technique [0002] With the development of my country's electric power industry, NOx emissions are increasing day by day. As we all know, NOx pollution can form acid rain, photochemical smog, and destroy the ecological environment. Its impact has attracted more and more attention and attention. With the improvement of my country's emission standards, coal-fired generating units basically require the installation of SCR (selective catalytic reduction) flue gas denitrification devices to reduce NOx emissions. [0003] The principle of SCR flue gas denitrification is: under the action of a catalyst, ammonia is injected into the flue gas, and NO x catalytic reduction to N 2 and H 2 O, because it is impossible to achieve 100% uniform mixing of the injected a...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 曹志勇金东春吴芳芳周飞梅汤治
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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