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Corrosion inhibiting method for cooling water system of production equipment in shutdown period

A technology for cooling water systems and production devices, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Low cost, reliable corrosion inhibition effect, convenient operation effect

Inactive Publication Date: 2004-10-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of dry protection is low, but the anti-corrosion effect is still unsatisfactory, especially in the parts where there is residual water in the device, the corrosion is serious
At present, there is no effective, reliable and economical protection method for the cooling water system of petrochemical equipment with relatively large volume and poor airtightness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Clean the cooling water system without stopping

[0020] 96 hours before the shutdown of the unit, a mixture of cleaning agents sodium polyacrylate, ethylenediaminetetramethylenephosphonic acid and citric acid was added. The concentration of the cleaning agent is 1200mg / L, add sulfuric acid, hydrochloric acid or nitric acid to control the pH value of the circulating cooling water at 4, and run continuously for 24 hours. Open the drain valve and make-up water valve for replacement, and replace the cleaning water out of the system in a short time.

[0021] Step 2: Pre-film the cooling water system

[0022] When the system is cleaned and the water is changed, add 120mg / L sodium hexametaphosphate to the water inlet, and add 80mg / L ZnSO after 0.5 hours 4 ·7H 2 O, after another 0.5 hour, slowly add 1% (v / v) industrial sulfuric acid at the place away from the water suction port to adjust the pH of the circulating water to 6.0. Analyze the total phosphorus and calci...

Embodiment 2

[0032] The cleaning agent is a mixture of acrylic acid and AMPS copolymer, amino trimethylene phosphonic acid and citric acid, the gas phase corrosion inhibitor is a mixture of dicyclohexylamine benzoate and cyclohexylamine carbonate, and the rest are the same as in Example 1.

Embodiment 3

[0034] The cleaning agent is a mixture of dimethyl benzyl dodecyl ammonium chloride and citric acid, the vapor phase corrosion inhibitor is a mixture of dicyclohexylamine nitrite and cyclohexylamine carbonate, and the rest are the same as in Example 1.

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PUM

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Abstract

The corrosion inhibiting method for cooling water system of production equipment in shutdown period includes the following steps: no-stopping clearing and pre-filming of water cooler and water pipeline in the circular cooling water system just before the equipment is shut down; discharging the cooling water in the system, blowing dry and setting drying agent to control the humidity of air in the sealed system below 60%; and adding gaseous corrosion inhibitor in the amount of 0.5-2.5 Kg / cu m and shutting down the corrosion inhibitor adding port immediately after adding to maintain the sealing state of the system. The said method can reach high and reliable corrosion inhibiting effect.

Description

technical field [0001] The invention belongs to the technical field of metal material surface anticorrosion, and in particular relates to a method for inhibiting corrosion of a circulating cooling water system during shutdown of a production device. technical background [0002] With the establishment and development of the socialist market economic system, the law of the market plays an increasingly important role in the production and development of the petrochemical industry. Enterprises must make corresponding production plans according to the price changes of raw materials and products in the market. When the market is favorable for production, the production equipment runs at full capacity or overloaded; when the market is unfavorable for production, the production equipment reduces its load or even stops running. Practice has found that the corrosion of water coolers and water pipelines of the cooling water system during outages is far more serious than during normal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10C23G1/06
Inventor 李本高傅晓萍于瑞红
Owner CHINA PETROLEUM & CHEM CORP
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