Detection method and detection device for online detection of scale and corrosion inhibitor concentration in circulating cooling water and circulating cooling water treatment control system

Abstract

The invention provides a detection method for online detection of the scale and corrosion inhibitor concentration in circulating cooling water. A cationic polyelectrolyte serves as a detection reagent, the detection reagent is added to a circulating cooling water sample, full mixing is performed, reaction is performed for 15-20 minutes, then an absorbance value of the reacted circulating cooling water sample is detected under the wavelength condition of 400-600 nm, and the scale and corrosion inhibitor concentration in the circulating cooling water is determined according to the absorbance value. The detection method is wide in application range, short in detection period, high in detection accuracy and good in stability and is not limited by the condition whether a scale and corrosion inhibitor is a phosphorus-containing or phosphorus-free agent. The detection device adopting the detection method can achieve online automatic detection, replace manual operation and eliminate various human factors and the influence of response time lag of all links and is simple in operation and low in operation cost. In addition, the circulating cooling water treatment control system composed of the online detection device can achieve whole-process management and automatic dosing control of circulating cooling water and is suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of circulating cooling water treatment, in particular to a detection method for online detection of the concentration of scale and corrosion inhibitors in circulating cooling water, a detection device using the detection method, and a circulating cooling water treatment control system including the detection device . Background technique [0002] With the increasing shortage of water resources, it has become an inevitable choice for enterprises to achieve sustainable development by greatly reducing the total amount of industrial water consumption and promoting water-saving production processes. In industrial applications, the amount of circulating cooling water is relatively large, and increasing the concentration ratio of circulating cooling water has become the main water-saving means for enterprises at present. [0003] During the operation of circulating cooling water, it is usually necessary to continu...

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Problems solved by technology

Traditional circulating cooling water control needs to go through a series of repeated links such as water sampling, testing, calculation, review, instruction transmission, personnel operation, re-sampling and testing, and auditing operation effects. It often takes several hours from the discovery of water quality that is not up to standard to the treatment. The whole process is mainly done manually. Affected by various human factors and the response time lag of each link, the circulating cooling water system is prone to unstable operation and excessive operation, which not only causes water resources, The waste of human resources and material resources can easily lead to problems such as scaling and corrosion in the operation of circulating cooling water, which brings hidden dangers to the normal production of enterprises

[0004] Since most of the scale and corrosion inhibitors currently used are chemicals containing organic phosphorus, in recent years, an online detection method of phosphorus has been developed to detect the concentration of the agent to replace manual detection, but there are many problems in practical applications, such as the online detection of phosphorus The analysis requires several steps such as digestion, reaction, and colorimetry of organic phosphorus. The analysis cycle is long, and it cannot be analyzed for non-phosphorous scale and corrosion inhibitors. With the environmental protection pressure of sewage discharge, phosphorus-containing scale and corrosion inhibitors are increasingly being used. The use of non-phosphorus scale and corrosion inhibitors is more and more widely used; fluorescent tracers are also used to detect the concentration of chemicals, but this method needs to add fluorescent substances to the scale and corrosion inhibitors or add fluorescent substances to the scale and corrosion inhibitors. Adding fluorescent groups and adding fluorescent corresponding instruments to detection equipment greatly increases the cost of pharmaceuticals and equipment, which is not suitable for industrial applications

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