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Problems and solutions in the use of heat exchangers
Source: Time: 2020-09-22 10:07:49 Hit:
Prevent scale and solid impurities
If a sodium ion exchanger is used when processing the supplementary water, the hardness of the supplementary water must meet the water quality standards, and the hardness, suspended solids, PH value and other indicators of the circulating water in the heating system must be strictly tested to reduce calcium and magnesium scale The production.
If tap water is used for the supplementary water, during the treatment process, a scale and corrosion inhibitor should be added to the water so that the corrosion rate and scale inhibition rate of the scale and corrosion inhibitor can meet the requirements. The added amount of scale corrosion inhibitor is regularly checked and tested to avoid scaling caused by insufficient addition or waste or corrosion caused by excessive addition.
The solid impurities in circulating water are mainly iron rust mud, mud sand, residue, copper oxide, biological slime, etc. In order to reduce the content of these suspended solids and other impurities, the content of suspended solids in the heating system should be controlled at 2-5mg/L For a well-treated circulating water system, the suspended solids content of the supplementary water should not be greater than 0.5-1.0mg/L, and the suspended solids content of the circulating water of the plate heat exchange system should be less than 10mg/L; on the return water and supplementary water pipelines Increase the filter to filter some of the suspended impurities with larger particles; strengthen the construction supervision and management, after each section of the large-diameter pipeline is installed, the construction personnel must be organized to clean up the welding slag and welding rod in time, and clean up after the completion of the construction ; During the daily operation period, management should be strengthened and pollutant discharged regularly to reduce suspended impurities.
Anti-corrosion and cleaning
If the chloride ion content in the water exceeds 200ppm, ordinary stainless steel plates should not be used when selecting heat exchangers. A series of measures can be taken to reduce the chloride ion content in the medium and keep it within a safe concentration range. For central heating systems, this method is costly and troublesome to manage. Generally, systems that use more stainless steel heat exchangers should control the chloride ion content below 300mg/L, or strictly below 50mg/L. Caustic soda can be added evenly during the operation of the heating system to increase the pH of the circulating water. The pH value is controlled at a stable level, so that after treatment, the effect of scale and corrosion inhibitor is also better. Clean the heat exchanger correctly and determine the cleaning method. For stainless steel materials, nitric acid is generally used as the cleaning agent, and hydrochloric acid cannot be used. During the cleaning process, minimize the cleaning time and immersion time, less than 2h. The corrosion rate and scale inhibition rate of the cleaning mother liquor are tested to avoid corrosion of the heat exchanger; no matter which cleaning fluid is used, it must be rinsed with clean water after cleaning to clean up the remaining cleaning fluid to avoid secondary corrosion.If you want to make the function of the heat exchanger come into play, you should make a reasonable calculation and selection based on the characteristics of the central heating system. At the same time, pay attention to the problems of fouling, clogging, and corrosion of the heat exchanger, and pay attention to the daily operation management of the heat exchanger. Measures to reduce the impact of fouling, blockage, and corrosion on the heat transfer efficiency and heating effect of the heat exchanger.
YOJO is committed to continuous exploration in practice, to solve the problems in the operation process, reduce the incidence of equipment failure, increase the service life of the equipment, and make the application value of the equipment in the central heating system play out.
Tag: heat exchange system, heat exchanger application, heat exchange equipment
