PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
What should be paid attention to in the cleaning and maintenance of heat exchanger?
Classification:
Industry dynamics
FAQ
Author:
Dankai
Source:
Dankai
Release time:
2021-12-08
Visits:
Heat exchanger after a long period of operation, the inevitable emergence of scale, rust problems, corrosion: heat exchanger cooling, frozen water untreated has a strong corrosive, such as ordinary steel or nails into the water, a few days after the rust, placed the longer the more serious corrosion.
The inner wall of the equipment is often due to corrosion caused by rust slag off, even perforation, off the rust slag will block the coil, so that the heat exchange effect is reduced; at the same time, the existence of corrosion makes the service life of the equipment greatly shortened. Scaling: inorganic salt dissolved in water in the pipeline crystallizes and precipitates, forming scale on the tube wall of the heat exchange surface such as the condenser, resulting in a decrease in heat exchange efficiency and a decrease in refrigeration effect, which is 30% in severe cases. At the same time, the hard scale increases, the electricity consumption increases, and the serious increase is 35%. Biological slime: due to the formation of dirt by soil, sediment and humus in water, and the formation of biological slime by bacteria, algae and other microorganisms and their secretions, the pipeline will be blocked in serious cases. However, dirt and slime will affect the heat exchange efficiency and consume more power, resulting in high-pressure operation and overpressure shutdown in serious cases.
All these seriously affect the normal operation of the heat exchanger. Therefore, the problems of scale, rust, silt, bacteria and algae in the heat exchanger system will directly lead to the weakening of heat exchange capacity, the shortening of service life, the reduction of operational reliability, and the increase of energy consumption will lead to the increase of operating costs. In order to make the heat exchanger system run in the optimal state, it is necessary to carry out special chemical treatment on the cooling water and chilled water system of the heat exchanger: removing scale, rust, slime, sterilization and anti-corrosion treatment, which is of significance: saving energy and reducing operating costs.
Figure 1: Heat exchanger Source: Dankai
In the heat transfer process of the evaporator and condenser of the heat exchanger, fouling directly affects the heat transfer efficiency and the normal operation of the equipment. The operation results of the heat exchanger show that the electricity consumption of the heat exchanger without cleaning will increase by 10-30% after a period of operation to extend the service life and reduce the depreciation and use fee of the equipment. Reduce the accident shutdown, improve the cooling effect. Cleaning can remove the sludge, so that the pipeline is smooth and the water quality is clear. At the same time, descaling and anti-scaling can improve the thermal efficiency of the condenser and evaporator, thus avoiding the phenomenon of overpressure shutdown in high-pressure operation, increasing the flow of chilled water, improving the refrigeration effect, and making the system operate safely and efficiently. For users to save a lot of maintenance costs: untreated heat exchanger, there will be pipeline blockage, scaling, corrosion, overpressure shutdown until the accident, such as heat exchanger due to corrosion leakage, solution pollution, you need to replace the copper tube, replace the solution, maintenance of the host, the general maintenance costs 2-50000 yuan. After treatment, it can not only reduce maintenance costs, but also extend the service life of the equipment, but also reduce the loss of hundreds of thousands of millions of owners.
In order to make the heat exchanger system run in the optimal state, it is necessary to carry out special chemical treatment on the water system of the heat exchanger system: removal of scale, rust, slime, sterilization and anti-corrosion treatment:
1. Chemical cleaning and sterilization: adding chemical cleaning agents and fungicides, cleaning and dispersing the floating rust, scale, oil, bacteria and algae in the system, and reducing them into clean metal surfaces;
2. Daily maintenance: Add corrosion and scale inhibitor to avoid metal rust and prevent calcium and magnesium ion crystallization and precipitation.
Shenzhen Dan Kai Technology Co., Ltd., specializing in FEP, PFA, PTFE, PVDF and other fluorine plastic tube rod sheet membrane products and other insulation materials research and development, production, sales and service of intelligent manufacturing enterprises.
ShenZhen DanKai Technology Co.,ltd. is an intelligent manufacturing enterprise specializing in the R & D, production, sales and service of FEP, PFA, PTFE,PVDF and other fluoroplastic tube, bar, sheet and film products as well as other insulating materials.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Need, heat exchanger, operation, system, treatment, severe, rust, equipment, corrosion, scale
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