Composite acid metal surface cleaning agent and using method thereof

A technology of metal surface and compound acid, which is applied in the field of surface cleaning of large boilers or heat exchanger metals, can solve the problems of high cost of medicines, poor cleaning ability, difficult disposal of waste liquid, etc., and achieves low cleaning cost, strong cleaning ability, The effect of low cleaning temperature

Active Publication Date: 2010-11-10
SHANDONG ZHONGSHI YITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cleaning agents have certain defects. Although hydrochloric acid cleaning has strong cleaning ability and low drug cost, it has a small range of applicable materials and cannot be used for cleaning stainless steel and alloy steel. The corrosion rate is up to 6g/m 2 Disadvantages above h
Although citric aci

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Composite acid metal surface cleaning agent: corrosion inhibitor components are 45 parts by weight of hexamethylenetetramine, 25 parts by weight of o-xylylene thiourea, 20 parts by weight of sodium alkylbenzene sulfonate, 3 parts by weight of sodium erythorbate, methyl 5 parts by weight of benzotriazole and 2 parts by weight of copper sulfate; the descaling component is 90 parts by weight of sulfamic acid, 8 parts by weight of citric acid and 2 parts by weight of cleaning reaction catalyst ammonium bifluoride; wherein the total mass of the corrosion inhibitor The mass ratio to the total descaling components is 1:35.

[0015] The compound acid metal surface cleaning agent is used to clean the supercritical boiler of a 600MW unit. The metal materials to be cleaned include 20G carbon steel and alloy steel of various specifications. The boiler water volume is 310m 3 . Calculate the amount of medicine according to the volume of water, first dissolve the corrosion inhibitor ...

Embodiment 2

[0018] Composite acid metal surface cleaning agent: corrosion inhibitor components are 50 parts by weight of hexamethylenetetramine, 25 parts by weight of o-xylylene thiourea, 20 parts by weight of sodium alkylbenzene sulfonate, 1 part by weight of sodium erythorbate, methyl 2 parts by weight of benzotriazole and 2 parts by weight of copper sulfate; the descaling component is 92 parts by weight of sulfamic acid, 6 parts by weight of citric acid and 2 parts by weight of cleaning reaction catalyst ammonium bifluoride; wherein the total mass of the corrosion inhibitor The mass ratio to the descaling component is 1:42.

[0019] The compound acid metal surface cleaning agent is used to clean the forced circulation drum boiler of a 300MW unit. The metal materials to be cleaned include 20G carbon steel, stainless steel and alloy steel of various specifications. The boiler water volume is 220m 3 . Calculate the amount of medicine according to the volume of water, first dissolve the c...

Embodiment 3

[0022] Composite acid metal surface cleaning agent: corrosion inhibitor components are 50 parts by weight of hexamethylenetetramine, 25 parts by weight of o-xylylene thiourea, 15 parts by weight of sodium alkylbenzene sulfonate, 4 parts by weight of sodium erythorbate, methyl 4 parts by weight of benzotriazole and 2 parts by weight of copper sulfate; the descaling component is 92 parts by weight of sulfamic acid, 6 parts by weight of citric acid and 2 parts by weight of ammonium bifluoride, a catalyst for cleaning reaction; wherein the total mass of the corrosion inhibitor The mass ratio to the total descaling components is 1:34.

[0023] The compound acid metal surface cleaning agent is used to clean the copper pipe of the condenser of a 300MW unit. The metal materials to be cleaned include 701B brass and B30 cupronickel, and the water volume of the condenser is 260m 3 . Calculate the dosage according to the water volume, first dissolve the corrosion inhibitor component and ...

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PUM

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Abstract

The invention discloses a composite acid metal surface cleaning agent and a using method thereof. The composite acid metal surface cleaning agent comprises 1% of corrosion-inhibiting component and 30%-50% of scale-removing components in mass percentage, wherein the corrosion-inhibiting component comprises 30-70 parts by weight of hexamethylene tetramine, 10-50 parts by weight of o-xylene thiourea, 10-50 parts by weight of sodium alkyl benzene sulfonate, 1-10 parts by weight of sodium erythorbate and 1-5 parts by weight of methyl benzotriazole; and the scale-removing components comprise 65-92 parts by weight of sulfamic acid, 3-30 parts by weight of citric acid and 0.1-5 parts by weight of ammonium bifluoride. The composite acid metal surface cleaning agent has the advantages of strong cleaning capacity, low cleaning temperature, no water-soluble volatility without acid mist generation, easy enforcement of cleaning engineering, low cleaning expense and the like and can be widely suitable for cleaning various large-scale boilers or heat exchangers.

Description

technical field [0001] The invention relates to a cleaning agent for metal surface cleaning, which is especially suitable for cleaning the surface of large-scale boiler or heat exchanger metal composed of various materials such as carbon steel, stainless steel, alloy steel, copper and copper alloy. Background technique [0002] Chemical cleaning of boilers in power plants plays an extremely important role in the safe and economical operation of power plants. With the increasing capacity of generating units, the capacity of boilers is getting higher and higher, and there are more and more types of heating surface materials, and the requirements for water vapor quality in boiler operation are also increasing. getting stricter. The quality of boiler cleaning directly affects the quality of water vapor and the safe and economical operation of the boiler. Therefore, higher and higher requirements are put forward for boiler cleaning. At present, the commonly used cleaning agents ...

Claims

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Application Information

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IPC IPC(8): C23G5/036
Inventor 周宝文李良
Owner SHANDONG ZHONGSHI YITONG GRP
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