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Method for controlling pH of industrial cooling water circulation system

A technology of circulating system and circulating water system, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Values ​​below the control range, etc.

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the chemical treatment technology, in order to ensure the effect of chemical cleaning and pre-filming in the process of chemical cleaning and pre-filming, the industrial cooling water circulation system must meet the requirements for the use of chemical cleaning and pre-filming agents, that is, meet the requirements of chemical cleaning and pre-filming. Requirements for the control range of the PH value of the chemical agent, it is necessary to control the pH of the circulating cooling water. In the past, strong acidic inorganic acids were mainly used to adjust the pH in the process of chemical cleaning and pre-filming. In this way, it is difficult to control the pH in the actual operation of chemical cleaning. Larger, it is difficult to control the amount of strong acidic inorganic acid, and there are often accidents where the pH value is lower than the control range, and it is often necessary to increase the pH by adding alkali. If the pH value is adjusted too high, it is necessary to strengthen the acidic inorganic acid. acid to reduce the pH, so it is difficult to meet the pH control requirements during chemical cleaning, which will have a certain impact on the effect of chemical cleaning and pre-membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for controlling the pH of the industrial cooling water circulation system of the present invention includes controlling the pH in the steps of chemical descaling and pre-filming, wherein the main process of chemical descaling and descaling is as follows: (1) the circulating water after sterilization, stripping and replacement Turbidity < 10PPm, forming a circulation loop of water passing through the water cooler and cooling tower; (2) Add osmotic activator to the sump of circulating water, adjust the pH value to 5.5 with sulfuric acid, and run for 4 hours; (3) To the system At the inlet of the circulating pump, add chemical descaling and descaling agents at one time, adjust the pH value to 3.5 with sulfamic acid, and keep the pH value for 48 hours or determine the end point of degreasing and derusting according to the control analysis data. During the cleaning process, according to the on-site Add dispersant and antiscalant according to the actual situation;...

Embodiment 2

[0025] The method for controlling the pH of the industrial cooling water circulation system of the present invention includes controlling the pH in the steps of chemical descaling and pre-filming, wherein the main process of chemical descaling and descaling is as follows: (1) the circulating water after sterilization, stripping and replacement Turbidity < 10PPm, forming a circulation loop of water passing through the water cooler and cooling tower; (2) Add osmotic activator to the sump of circulating water, adjust the pH value to 6 with sulfuric acid, and run for 6 hours; (3) Add to the system’s At the inlet of the circulating pump, add chemical descaling and descaling agents at one time, adjust the pH value to 4.5 with sulfamic acid, and keep the pH value for 48 hours or determine the end point of degreasing and descaling according to the control analysis data. During the cleaning process, according to the actual situation on site (4) After the cleaning is completed, replace...

Embodiment 3

[0028] The method for controlling the pH of the industrial cooling water circulation system of the present invention includes controlling the pH in the steps of chemical descaling and pre-filming, wherein the main process of chemical descaling and descaling is as follows: (1) the circulating water after sterilization, stripping and replacement Turbidity < 10PPm, forming a circulation loop of water passing through the water cooler and cooling tower; (2) Add osmotic activator to the sump of circulating water, adjust the pH value to 6.5 with sulfuric acid, and run for 8 hours; (3) Add to the system’s At the inlet of the circulating pump, add chemical descaling and descaling agents at one time, adjust the pH value to 5.5 with sulfamic acid, and keep the pH value for 48 hours or determine the end point of degreasing and descaling according to the control analysis data. During the cleaning process, according to the actual situation on site (4) After the cleaning is completed, repla...

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PUM

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Abstract

The invention discloses a method for controlling pH of an industrial cooling water circulation system. The method comprises a step of removing rust and scales chemically and a step of filming. The method for controlling pH of the industrial cooling water circulation system is characterized by firstly adding a penetration activator in a circulating water collecting tank and adjusting the pH value to 5.5-6.5 by using sulfuric acid for 4-8 hours; then adding a chemical rust and scale removal agent in the circulating water collecting tank for once and adjusting the pH value to 3.5-5.5 by using sulphamic acid during the chemical rust and scale removal process; and adjusting the pH value of the covered film to 6.0-7.0 by using sulfuric acid. According to the method, the pH value is controlled by adding faintly acidic organic sulfamic acid and highly acidic inorganic sulfuric acid during different running periods of a circulating water system, so that the pH value for chemical cleaning and filming can be controlled better, the control requirements on the pH value during the chemical cleaning and filming can be satisfied, and the chemical cleaning and filming can achieve the ideal effects.

Description

technical field [0001] The invention relates to an industrial cooling water circulation system, in particular to a method for controlling the pH of the industrial cooling water circulation system. Background technique [0002] In the existing process, the treatment of industrial cooling water circulation system is mainly divided into physical treatment and chemical treatment. Physical treatment technologies mainly include: magnetic treatment, electrostatic treatment, photochemical treatment, ultrasonic treatment, etc. Physical treatment technology has the advantages of simple operation, low operating cost, non-toxic and non-polluting. This method is suitable for water with low hardness, but the water treatment effect of complex water with high hardness in my country is not satisfactory. Chemical treatment technology usually adds a certain amount of water quality stabilizer to the make-up water to prevent scaling and corrosion of the water system. Scale prevention is achiev...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 张海东文加强
Owner CHINA PETROLEUM & CHEM CORP