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Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas

A technology for concentration measurement and thermal power plants, which is applied in measuring devices, material absorption weighing, suspension and porous material analysis, etc. It can solve problems such as weighing errors, easy loss of filter cartridges, strong water absorption of filter cartridges, etc., to achieve Reduce measurement errors, avoid weighing errors, and improve applicability

Inactive Publication Date: 2015-02-04
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Greatly affected by the laboratory environment: the filter cartridge has strong water absorption, and the weighing process is greatly affected by the ambient humidity, resulting in weighing errors;
[0005] (2) The filter cartridge is easy to lose during sampling: when the filter cartridge is installed and removed from the sampling gun, it is easy to stick to the sampling gun, resulting in loss of the filter cartridge and errors;
[0006] (3) Transportation and storage loss: the filter cartridge is easy to lose during transportation and storage, resulting in errors;
The traditional filter cartridge test method has large errors, and the existing test standards were formulated more than ten years ago, and some methods cannot meet the current measurement accuracy requirements

Method used

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  • Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas
  • Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas
  • Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Take a used sampling head (number 001), and clean the sampling head with ultrasonic waves for 40 minutes. After cleaning, dry it in a drying oven at 105°C for 2.5 hours, and then balance it on a one-hundred-thousandth balance Weigh it under, the result is 3.01236g; then use ultrasonic to clean the sampling head again for 40 minutes, after cleaning, dry it in a drying oven at 105°C for 2.5 hours, then weigh it under the balance of 1 / 100,000, the result is 3.01234g, the mass difference between the two times is 0.00002g (ie 0.02mg), less than 0.1mg;

[0041](2) Install a filter membrane (No. 001) on the sampling head, dry it in a drying oven at 105°C for 2.5 hours, then weigh it under a one-hundred-thousandth balance, and record the weighing mass as 3.32154g; then dry it again Dry it at 105°C for 2.5 hours, weigh it on a one-hundred-thousandth balance, and record the weighing mass as 3.32153g; the difference between the two weighings Δm is 0.01mg, which is less than 0....

Embodiment 2

[0048] (1) Take a used sampling head (No. 002), and clean the sampling head with ultrasonic wave for 30 minutes. After cleaning, dry it in a drying oven at 100°C for 2 hours, and then balance it in one hundred thousandth of the balance. Weigh it under the ground, and the result is 3.01224g; then clean the sampling head again with ultrasonic waves for 30 minutes, after cleaning, dry it in a drying oven at 100°C for 2 hours, and then weigh it under a one-hundred-thousandth balance, the result is 3.01222g, the mass difference between the two times is 0.00002g (ie 0.02mg), less than 0.1mg;

[0049] (2) Install a filter membrane (No. 002) on the sampling head, dry it in a drying oven at 100°C for 2 hours, then weigh it under a one-hundred-thousandth balance, and record the weighing mass as 3.32142g; then dry it again Dry it at 100°C for 2 hours, weigh it on a one-hundred-thousandth balance, and record the weighing mass as 3.32141g; the difference between the two weighings Δm is 0.0...

Embodiment 3

[0056] (1) Take a used sampling head (number 003), and clean the sampling head with ultrasonic waves for 60 minutes. After cleaning, dry it in a drying oven at 105°C for 4 hours, and then balance it on a one-hundred-thousandth balance Weigh it under, and the result is 3.01248g; then clean the sampling head again with ultrasonic waves for 60 minutes, after cleaning, dry it in a drying oven at 105°C for 4 hours, and then weigh it under a one-hundred-thousandth balance, the result is 3.01246g, the mass difference between the two times is 0.00002g (ie 0.02mg), less than 0.1mg;

[0057] (2) Install a filter membrane (No. 003) on the sampling head, dry it in a drying oven at 105°C for 4 hours, then weigh it under a one-hundred-thousandth balance, and record the weighing mass as 3.32166g; then dry it again Dry in the oven at 105°C for 4 hours, weigh it on a one-hundred-thousandth balance, and record the weighing mass as 3.32165g; the difference between the two weighings Δm is 0.01mg,...

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Abstract

The invention relates to a method for reducing the smoke dust concentration measurement errors of thermal power plant flue gas. The method comprises the following steps: mounting a filter membrane on a new sampling head or a sampling head satisfying requirements after being ultrasonically cleaned and then drying and weighing the sampling head, performing in situ sampling, drying and weighing after sampling, and calculating the smoke dust concentration. The loss error of a filter cartridge caused in the sampling, transportation and storage processes, the error caused by the mass change of the used sampling head due to smoke dust contamination and the error caused by too small sampling volume due to not-explicit stipulation in the standards are avoided. The method for reducing the smoke dust concentration measurement errors of the thermal power plant flue gas is suitable for low smoke dust concentration measurement, capable of effectively reducing the measurement errors, and also capable of adjusting the weighing mass difference and the sampling volume according to the accuracy requirements of the measured smoke dust concentration; as a result, the applicability of the method is improved.

Description

technical field [0001] The invention belongs to the field of smoke detection, in particular to a method for reducing the measurement error of the smoke concentration of the smoke in a thermal power plant. Background technique [0002] At present, for the measurement of the dust concentration of flue gas in thermal power plants, in addition to the online monitoring system for measurement, the on-site monitoring generally adopts the national standard method GB / T 13931-2002 "Electric Precipitator Performance Test Method" and GB / T 16157-1996 " Measurement of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling Methods of Gaseous Pollutants", but the standard only stipulates the principles, principles and some steps of the measurement of soot concentration, and does not specify the control requirements for each numerical error. [0003] Traditional filter cartridge testing methods have the following disadvantages: [0004] (1) Greatly affected by the labo...

Claims

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Application Information

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IPC IPC(8): G01N5/02G01N15/06
Inventor 马新刚厉一梅李景文刘辉周灿张兆波谢连科臧玉魏
Owner STATE GRID CORP OF CHINA
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