Method for testing limestone reaction activity

A technology of reaction activity and test method, which is applied in the direction of chemical analysis by titration method, can solve the difficulty of selecting limestone parameters, the increase of investment and operation costs of desulfurization system, and the difficulty of limestone activity test technology to meet the wet flue gas desulfurization engineering design and desulfurization model optimization needs and other issues

Inactive Publication Date: 2012-10-10
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, the existing limestone activity testing technology is difficult to meet the needs of engineering design and desulfurization model optimization of wet flue gas desulfurization
It makes it difficult to select the limesto...

Method used

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  • Method for testing limestone reaction activity
  • Method for testing limestone reaction activity
  • Method for testing limestone reaction activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Grind and sieve the limestone sample, process it into 200-300 mesh limestone powder, and store it in a dry container.

[0054] (2) CaCO in limestone samples 3 Content is 90.55%, MgCO 3 The content is 1.32%.

[0055] (3) Prepare a sulfuric acid solution with a concentration of 90%. When preparing the sulfuric acid solution, it should be noted that the acid solution must be dripped into the water for preparation; instead of dripping the water into the sulfuric acid solution, it is easy to boil and splash the acid.

[0056] (4) Prepare a 0.1mol / L calcium chloride solution, and pour 90ml of the calcium chloride solution into a 200ml beaker. The purpose of using the calcium chloride solution instead of water directly is to prevent the limestone from slightly dissolving in the solution, which would affect the results of the limestone activity measurement.

[0057] (5) Place the beaker on the thermal stirring platform 3, and turn on the thermal stirring device and the ...

Embodiment 2

[0063] (1) Grind and sieve the limestone sample, process it into 200-300 mesh limestone powder, and store it in a dry container.

[0064] (2) CaCO in limestone samples 3 Content is 85.30%, MgCO 3 Content is 3.80%

[0065] (3) Prepare a sulfuric acid solution with a concentration of 70%.

[0066] (4) Prepare a 0.1mol / L calcium chloride solution, and pour 90ml of the calcium chloride solution into a 200ml beaker.

[0067] (5) Place the beaker on the thermal stirring platform 3, and turn on the thermal stirring device and the temperature control system. The temperature is controlled at 60±2° C., and the stirring speed is 500 r / min.

[0068] (6) Weigh 12g of limestone powder into a beaker and stir for 5 minutes to form a limestone suspension.

[0069] (7) Start the computer 1 and the pH meter 2, and connect the computer 1 and the communication interface of the pH meter 2.

[0070] (8) Start micrometering pump 5, sulfuric acid solution is titrated in limestone solution with th...

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Abstract

The invention provides a method for testing a limestone reaction activity, comprising preparing an acidic reagent and limestone slurry, and adding the acidic reagent in drops into the limestone slurry to react and test the reaction activity, wherein the acidic reagent is a sulfuric acid solution, a particle size of the tested limestone powder particles is 200 to 300 meshes, and the acidic reagent is added in drops into a reactor at a certain rate. The temperature of the limestone slurry in the reactor is constant. A computer collects a titration rate of the acidic reagent and a pH-value change curve during the reaction in real time. The method employs a shrinking core model, calculates, by using a calculating model for limestone activity, to obtain an undissolved volume fraction of the limestone quantitatively and then determine the limestone reaction activity quantitatively. The test method provided in the invention is simple and practical, has accurate measurement results, and can correctly evaluate the desulphurization reaction activity of the limestone and provide a theoretical basis for an early stage design of a flue gas desulphurization system.

Description

technical field [0001] The invention belongs to the technical field of wet flue gas desulfurization, in particular to a method for testing the reactivity of limestone. Background technique [0002] Sulfur dioxide is the main cause of acid rain. The area of ​​acid rain in my country has expanded by more than 1 million square kilometers compared with the 1980s, and the area with an average annual pH value of precipitation below 5.6 has accounted for about 30% of the country's area. Due to serious environmental pollution, it has caused high economic and environmental costs, and has caused obvious damage to public health. The results of domestic and foreign research institutions have shown that the economic loss caused by air pollution accounts for 3%-7% of GDP. %. [0003] With the emphasis on sulfur dioxide pollution in our country, the sulfur dioxide emission standards have become increasingly strict, making various desulfurization technologies have been greatly developed, e...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 徐伟王永陈鹏胡绍伟袁玲马光宇
Owner ANGANG STEEL CO LTD
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