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Blast furnace gas condensate water acidic treating method

A technology of blast furnace gas and condensed water, applied in blast furnaces, blast furnace details, neutralization water/sewage treatment, etc., can solve problems such as rapid corrosion of gas pipelines

Inactive Publication Date: 2009-07-08
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for treating the acidity of blast furnace gas condensate water. By controlling the pH of the condensate water, especially a small-scale spraying device is continuously used to solve the problem of rapid corrosion of the gas pipeline in the dry dust removal process. The normal operation of industrial blast furnace gas pipeline needs

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The Q235 carbon steel sample corrosion test was adopted, and the test time was 72 hours. The test results are as follows:

[0019] pH value of blast furnace condensate Corrosion rate (mm / a) 2.96 8.331 5.02 1.197 6.45 0.726 6.86 0.635 6.98 0.473 7.04 0.302

[0020] 8.22 0.262

[0021] The effect of the invention:

[0022] Ammonia water is used as the lye to adjust the pH value, and the concentration of ammonia water is NH 3 The content is 25-28%. The test data are as follows:

[0023] Ammonia water dosing mass ratio (mass ratio of ammonia water to condensed water) pH value of blast furnace condensate 0 2.96 0.5％ 5.02 1％ 6.45 2％ 6.86 5％ 6.98 7.5％ 7.04 10％ 8.22

[0024] Use a small metering pump to add medicine, regularly measure the PH value of the condensed water, and determine the dosage.

[0025] The choice of dosing point. The temperature in the purific...

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Abstract

The invention relates to a blast furnace gas condensed water acidity treatment method, and belongs to the technical field of blast furnace ironmaking. The method comprises the following process flow: feeding air by an air blower, smelting in the blast furnace, dedusting of the coal gas by a dry method, TRT decompression, and transportation by a pipe network to a coal gas user. Ammonia is sprayed in the process of the pipe network transportation; the ammonia accounts for 1 to 5 percent of mass of the gas condensed water; and 1 to 2 percent of the ammonia is preferentially selected and sprayed. In the ammonia, the content of NH3 is between 25 and 28 percent. The method has the advantages of solving the problem of rapid corrosion of a gas pipeline in a dedusting process by the dry method, and meeting requirement on normal operation of the blast furnace gas pipeline in the industry.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular provides a method for treating the acidity of blast furnace gas condensed water. Background technique [0002] The sensible heat utilization of blast furnace gas dry dedusting is significantly improved. At the same time, the pressure energy of blast furnace gas can be converted into electric energy through the TRT-blast furnace gas pressure difference to generate electricity, so that 1 / 3 of the blast furnace electric energy can be converted into electric energy after the completion of production. Recycling. At the same time, compared with wet dedusting, full dry dedusting uses bag filtration instead of water washing dedusting in the production process, which saves a lot of water resources. Blast furnace gas dry dust removal technology has been widely used in new iron and steel enterprises. [0003] The first phase of Qinhuangdao Shouqin Metal Materials Co., Lt...

Claims

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Application Information

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IPC IPC(8): C02F1/66C21B5/06C21B7/22
Inventor 陈廷军张立伟朱新喜王学明王晓东马全徐卫民张继
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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