Post-desulphurization flue gas moisture content determination method and apparatus

A technology of flue gas after desulfurization and measurement device, which is applied in the field of chemical analysis, can solve the problems of inability to guarantee the accuracy of the test, difficulty in ensuring the condensation effect of the condenser, and the complexity of the measurement process, so as to improve the analysis efficiency and accuracy and save sampling and sample processing time, the effect of simplifying the analysis operation

Active Publication Date: 2013-02-20
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: it is difficult to guarantee the condensation effect of the condenser; it is necessary to calculate the moisture content of saturated steam according to the relationship curve of saturated vapor pressure and temperature of water; the weighing of condensed water needs to be completed in the laboratory, and the moisture content cannot be obtained in real time results, and the accuracy of the measurement results is poor
The disadvantage of this method is that it is necessary to continuously add water to the water container to ensure that the gauze wrapping the wet bulb is soaked in water, otherwise the accuracy of the test cannot be guaranteed; during the calculation of the moisture

Method used

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  • Post-desulphurization flue gas moisture content determination method and apparatus
  • Post-desulphurization flue gas moisture content determination method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Testing the moisture content of flue gas at the outlet of a desulfurization system of a 600MW unit

[0043] The flue gas enters the titration cup 11 of the Karl Fischer titrator through the sampling pipe 3, the heat tracing ventilation pipeline 4, the suction pump 5, the flow regulating valve 6, the flow meter 7, the three-way valve 8 and the intake pipe 12. method to measure.

[0044] (1) Measurement preparation: Add 100mL of anhydrous methanol to the titration cup 11 using the automatic suction and discharge system, turn the three-way valve 8 to the emptying position, and use the three-way valve to cut off the connection between the Karl Fischer titration system, the flue gas sampling system and the outside atmosphere . Start the titrator auto-balance function to reset the titrator to the system blank value. Preheat the heat tracing ventilation line 4. Anhydrous methanol is analytically pure anhydrous methanol.

[0045] (2) Calibration of Karl Fischer re...

Embodiment 2

[0051] Example 2 Testing the moisture content of flue gas at the outlet of a 300MW unit desulfurization system

[0052] (1) Measurement preparation: Add 100mL of anhydrous methanol to the titration cup 11 using the automatic suction and discharge system, turn the three-way valve 8 to the emptying position, and use the three-way valve to cut off the connection between the Karl Fischer titration system, the flue gas sampling system and the outside atmosphere . Start the titrator auto-balance function to reset the titrator to the system blank value. Adjust the temperature of the heating line to 130°C and preheat the sampling system. Anhydrous methanol is analytically pure anhydrous methanol.

[0053] (2) Accurately weigh 20 mg of standard water with a balance and pour it into the titration cup 11, start stirring, adjust the stirring speed, so that the methanol solution has obvious swirl but no air bubbles, titrate with Karl Fischer reagent, and the volume of Karl Fischer reagen...

Embodiment 3

[0059] Example 3 Test the moisture content of flue gas at the outlet of a 300MW unit desulfurization system (with flue gas heat exchanger)

[0060] (1) Measurement preparation: Add 100mL of anhydrous methanol into the titration cup 11 using the automatic suction and discharge system, turn the three-way valve 8 to the emptying position, and use the three-way valve 8 to cut off the connection between the Karl Fischer titration system, the flue gas sampling system and the outside atmosphere. connect. Start the titrator auto-balance function to reset the titrator to the system blank value. Adjust the temperature of the heating line to 120°C and preheat the sampling system. Anhydrous methanol is analytically pure anhydrous methanol.

[0061] (2) Accurately weigh 20 mg of standard water with a balance and pour it into the titration cup 11, start stirring, adjust the stirring speed, so that the methanol solution has obvious swirl but no air bubbles, titrate with Karl Fischer reagen...

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Abstract

The invention relates to a post-desulphurization flue gas moisture content determination method and apparatus. The apparatus comprises a sampling tube, a heat tracing ventilation pipe, a gas suction pump, a flow regulating valve, a flow meter, a three-way valve, a temperature measuring instrument, a pressure measuring instrument, and a Karl Fischer titrator, which are connected sequentially. The determination method comprises the steps that: (1) 100ml of anhydrous methanol is added into a titration cup, and the titrator is reset to a system blank value. (2) standard water is accurately measured, and is injected into the titration cup; and the concentration of a Karl Fischer reagent is measured by using the titrator; (3) the pipeline is washed by using flue gas for 10-15min; (4) a flue gas flow rate is controlled at 50-100mL/min, and a ventilation time is 2-5min; and titration is carried out by using the titrator; and (5) with the titrator, the post-desulphurization flue gas moisture content is automatically calculated. According to the post-desulphurization flue gas moisture content determination apparatus provided by the invention, a Karl Fischer titration method is used in flue gas moisture content determination, the analysis operation is simple and fast, and analysis result is accurate and reliable. Therefore, an instant and accurate basis can be provided for production operation adjustment and data calculation.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a method and a device for measuring the moisture content of flue gas after desulfurization. Background technique [0002] The moisture content of the flue gas after desulfurization is an important parameter in the design, transformation and production operation of the wet desulfurization system. It is used to calculate the condensation temperature of the flue gas, the emission of flue gas pollutants and the water consumption of the desulfurization system. Traditionally, the moisture content of flue gas is determined by condensation method, wet and dry bulb method and gravimetric method. [0003] The condensation method is to pass the flue gas extracted from the flue gas pipeline through the condenser, and calculate the moisture content in the flue gas according to the sum of the condensed water amount and the water vapor content in the saturated gas removed by the condens...

Claims

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Application Information

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IPC IPC(8): G01N27/42
Inventor 宋晓红陈崇明李振海宋国升
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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