What necessary investigations should be made before screening corrosion and scale inhibitors
As we all know, corrosion inhibitor is a kind of substance added to water that can interfere with the electrochemical action of corrosion and can prevent or reduce the corrosion rate of metal. Before using experimental verification, we should master the actual situation on the site and conduct a comprehensive investigation on the circulating cooling water system to be processed. This is also an important basis for Ande technology to choose recycled water agents. The specific methods are summarized as follows:
(1) Water quality
(1) Understand the source water is surface water or groundwater, whether it is polluted. Groundwater shall be analyzed quarterly for not less than one year. If there are several Wells, the water quality of each well should be known. For surface water, complete monthly analysis data of not less than one year should be collected.
(2) Supplement water quality to understand whether the raw water, after pretreatment and pretreatment methods, the use of flocculant or coagulant varieties. Full monthly water quality analysis data of not less than one year shall be collected. '
(3) water quality of circulating cooling
If the circulation system has been in operation, the on-site circulating water quality data can be directly used as the basis for selecting the formula. However, data should be selected when the concentration multiple is stable, at least monthly data for a year. The data at natural pH values should be known as far as possible. '-
(2) Design data of circulating cooling water system
Need to understand the type of cooling tower, circulating water FFI (m3/h), the system 'volume V (m3), the design of inlet and outlet tower water temperature (°C). It is also necessary to know the concentration multiple possible for the system and the effluent B(m3/h), wind-blown loss D(MVh) and replenishment M(m3/h) at the operating multiple. And understand the annual temperature, humidity and water temperature trends. ,
The average residence time of the agent in the system, T[V7(B+D)], should not exceed 50h in order to prevent the agent from decomposing or precipitating from hydrolysis.
(3) Data and process characteristics of the water cooler
Need to understand all the data of water treatment cooler, including the number, model, structure, material, thermal strength, process medium inlet and outlet water temperature, water flow rate and other issues.
(4) Understand the surrounding discharge environment and air pollution, understand the environment of the area through which sewage flows after discharge, whether there are agricultural crops, aquatic crops and the final discharge water area, etc., all of which will affect the stability of the circulating water system.
