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Metal scale remover

A descaling agent and metal technology, which is used in the surface cleaning of large boilers or heat exchangers, and in the field of metal descaling agents, can solve the problems of long heating time, high use temperature, and high heat source requirements, so as to promote the removal of metal ions and improve The effect of descaling efficiency and good corrosion inhibition effect

Inactive Publication Date: 2017-01-11
HEFEI TIANXIANG ENVIROMENT PROJECT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These agents all have certain shortcomings in the current use, such as hydrochloric acid cannot be used for austenitic steel and stainless steel, although citric acid and EDTA have a wide range of applications, but the use temperature is higher (citric acid 90-95 ℃, EDTA120-140 ℃), which has the disadvantages of high heat source requirements and long heating time during the implementation process, especially in winter for newly-built units put into operation, the temperature rise is the biggest restrictive factor
Moreover, the treatment of these two organic acid waste liquids is difficult. Generally, they have to be transferred to coal yards or ash yards or adopt biochemical treatment methods. Conventional chemical treatment methods at room temperature cannot achieve discharge standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A metal descaling agent, calculated in parts by weight, consists of the following components:

[0018] 20 parts of succinic acid, 10 parts of glycolic acid, 4 parts of vitamins, 4 parts of trisodium phosphate, 3 parts of sodium metasilicate, 5 parts of sodium hexametaphosphate, 1 part of sodium fatty acid polyvinyl ether sulfate, 1 part of lauryl polyoxyethyl ether , 1 part of urotropine, and 80 parts of deionized water.

[0019] The scale thickness in the sample boiler is 4mm, and the use temperature is 50°C. After adding it to the boiler, it will be descaled in a cycle. Solution, added to the boiler for circulation, circulation flow rate 0.5m / s, cleaning for 2 hours, the scale removal rate is above 98%, and the corrosion rate is 1.506g / m 2 h.

Embodiment 2

[0021] A metal descaling agent, calculated in parts by weight, consists of the following components:

[0022] 24 parts of succinic acid, 12 parts of glycolic acid, 6 parts of vitamins, 5 parts of trisodium phosphate, 4 parts of sodium metasilicate, 6 parts of sodium hexametaphosphate, 2 parts of sodium fatty acid polyvinyl ether sulfate, 1 part of lauryl polyoxyethyl ether , 2 parts of sodium dodecylbenzenesulfonate, and 85 parts of deionized water.

[0023] The scale thickness in the sample boiler is 4mm, and the use temperature is 55°C. After adding it into the boiler, it will be descaled in a cycle. Add the solution to the boiler for circulation, the circulation flow rate is 0.5m / s, and the cleaning time is 1.5 hours. The descaling rate is above 98%, and the corrosion rate is 1.482g / m 2 h.

Embodiment 3

[0025] A metal descaling agent, calculated in parts by weight, consists of the following components:

[0026] 26 parts of succinic acid, 14 parts of glycolic acid, 7 parts of vitamins, 7 parts of trisodium phosphate, 5 parts of sodium metasilicate, 8 parts of sodium hexametaphosphate, 3 parts of sodium fatty acid polyvinyl ether sulfate, 1 part of lauryl polyoxyethyl ether , 3 parts of aniline, and 86 parts of deionized water.

[0027] The scale thickness in the sample boiler is 4mm, and the use temperature is 57°C. After adding it into the boiler, it will be descaled in a cycle. Add the solution to the boiler for circulation, the circulation flow rate is 0.5m / s, and the cleaning is 1 hour, the scale removal rate is above 98%, and the corrosion rate is 1.523g / m 2 h.

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PUM

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Abstract

The invention provides a metal scale remover. The metal scale remover is prepared from, by weight, 20-30 parts of succinic acid, 10-15 parts of glycolic acid, 4-8 parts of vitamins, 4-10 parts of trisodium phosphate, 3-6 parts of sodium metasilicate, 5-10 parts of sodium hexametaphosphate, 1-3 parts of fatty acid polyvinyl ether sodium sulfate, 1-2 parts of laurinol polyoxy diethyl ether, 1-5 parts of a corrosion inhibitor and 80-90 parts of deionized water. The cleaning temperature of the scale remover is low, dirt on the surface of metal can be removed fast, and the metal is hardly corroded.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a metal descaling agent, which is suitable for cleaning the surface of large boilers or heat exchangers made of various materials such as carbon steel, stainless steel, alloy steel, copper and copper alloy. Background technique [0002] For water equipment, scaling is an eternal topic. During normal use of the boiler, scaling will occur due to the presence of calcium and magnesium ions in the water, which will greatly affect the heat transfer efficiency. At the same time, there are great safety hazards, causing equipment Runs unstable. Descaling agent is a chemical preparation that removes scale, dirt and other stains, and is generally composed of multiple components. Industrial descaling agents are mainly used to remove dirt in heat exchange equipment, boilers, etc. Household descaling agents are mainly used to remove dirt in water dispensers. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
CPCC23G1/06
Inventor 周玉祥
Owner HEFEI TIANXIANG ENVIROMENT PROJECT