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Method for scale inhibition of blasting condensation high hardness circulating water in coking plant

A technology of circulating water and high hardness, which is applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. It can solve the problems of harsh application process conditions, complex formula of compound antiscalant, high cost, etc. , to achieve the effect of high calcium hardness and alkalinity tolerance, low cost, and less addition

Active Publication Date: 2015-11-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems existing in the prior art, such as complex formula of the above-mentioned composite antiscalant, harsh application process conditions, use of organic polymer compounds as components, and high cost, the purpose of the present invention is to provide a Scale inhibition method for high hardness circulating water, through simple operation method, and using less compound scale inhibitor to achieve effective scale inhibition, corrosion inhibition and bactericidal and algae killing functions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The implementation of a scale inhibition method for blast condensation of high hardness circulating water in a coking plant is as follows.

[0015] First, prepare modified humic acid. The specific preparation method is: add 20% nitric acid of humic acid mass concentration to humic acid, after mixing evenly, adjust the solid-liquid ratio to 0.35-0.5, and control the reaction temperature to 60-80°C, and make it React for 30-50 minutes, then centrifuge, wash with water to remove salt until neutral, centrifuge, filter and dry to obtain modified humic acid.

[0016] Second, prepare compound antiscalant. The composition and content of the composite scale inhibitor are as follows by mass percentage: 30% modified humic acid, 25% lignosulfonate, 7% polymaleic anhydride, 3.5% aminotrimethylphosphonic acid and the rest of water . After mixing the raw materials in proportion, 10% by mass fraction of sodium hydroxide was added to adjust the pH to 9 to obtain the composite scale i...

Embodiment 2

[0021] A composite antiscalant, which is prepared from the following raw materials by mass percentage: 20% modified humic acid, 30% lignosulfonate, 10% polymaleic anhydride, 4.0% aminotrimethylphosphonic acid, and The amount is water. After mixing the raw materials in proportion, 10% by mass fraction of sodium hydroxide was added to adjust the pH to 9 to obtain the composite scale inhibitor of this example.

[0022] Using 7ppm of the composite antiscalant described in Example 2 for self-dispensing water with a calcium ion concentration of 300mg / L, with reference to "National Standard of the People's Republic of China GB / T16632-2008, Determination of Scale Inhibition Performance of Water Treatment Agents - Calcium Carbonate Deposition Method" 》, it was determined that the scale inhibition rate of the composite scale inhibitor reached 99.5%, and the corrosion inhibition rate reached 54.13%.

Embodiment 3

[0024] A composite antiscalant, which is prepared from the following raw materials by weight percentage: 15% modified humic acid, 35% sulfonate, 5% polymaleic anhydride, 3.5% aminotrimethylphosphonic acid, and the balance is water. After mixing the raw materials in proportion, 10% by mass fraction of sodium hydroxide was added to adjust the pH to 9 to obtain the composite scale inhibitor of this example.

[0025] Using 7ppm of the composite antiscalant described in Example 3 for self-dispensing water with a calcium ion concentration of 300mg / L, with reference to "National Standard of the People's Republic of China GB / T16632-2008, Determination of Scale Inhibition Performance of Water Treatment Agents - Calcium Carbonate Deposition Method" 》, it was determined that the scale inhibition rate of the composite scale inhibitor reached 95.5%, and the corrosion inhibition rate reached 48.89%. .

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Abstract

A method for scale inhibition of blasting condensation high hardness circulating water in a coking plant is realized by adding a composite scale inhibitor to the composite scale inhibitor, continuously adding the composite scale inhibitor after a ton of water is supplemented, and performing the operation repeatedly, wherein the composite scale inhibitor comprises modified humic acid, lignosulfonate, polymaleic anhydride, amino trimethylene phosphonic acid and deionized water. The modified humic acid adopted in the method has chelation to metal ions, and has dispersing power to calcium carbonate and calcium phosphate; after the composite scale inhibitor is added into water, loose and non-wall-mounted soft scale is formed; meanwhile, the synergistic effect and the threshold effect between the modified humic acid and molecules of all auxiliary component are excellent, so that the consumption of the composite scale inhibitor is reduced; the composite scale inhibitor for a blasting condensation high hardness circulating water system in the coking plant also has the functions of sterilization and algae killing, and can inhibit the generation of adherence algae, so that a procedure of regular adding of an algaecide and a bactericide in the circulating water is eliminated.

Description

Technical field [0001] The invention relates to a treatment method for blast condensation high-hardness circulating water in a coking plant, particularly a method consisting of modified humic acid, lignosulfonate, polymaleic anhydride, aminotrimethylphosphonic acid and deionized water. The compound anti-scaling agent is used as a scale-inhibiting method for blasting and condensing high-hardness circulating water in coking plants. technical background [0002] The hardness and alkalinity of groundwater in the Central Plains, North China and Northwest China, measured as CaCO3, mostly exceeds 180×10-6 and 250×10-6 in the past, indicating strong scaling water quality. Using this type of water quality as circulating cooling water will cause scaling and corrosion of equipment and pipelines. Especially the blast condensation circulating water in the coking plant. This circulating water system is close to the coke oven and coal yard and is easily affected by dust. The circulating w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 盛清涛刘彦荣申峻牛艳霞刘刚
Owner TAIYUAN UNIV OF TECH
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