System solution
Central air conditioning cooling water circulation system
The cooling water circulation system is a type of central air conditioning system, which refers to a water supply system where the cooling water exchanges heat and is cooled and reused. It mainly consists of cooling equipment, water pumps, and pipelines, including open and closed types. The principle of a cooling water circulation system is to use water as the cooling medium and recycle it. Mainly composed of cooling equipment, water pumps, and pipelines. After cold water flows through production equipment that requires cooling (often referred to as heat exchange equipment, such as heat exchangers, condensers, and reactors), the temperature rises. If it is discharged immediately, the cold water is only used once (referred to as a direct flow cooling water system), causing the temperature of the heated cold water to drop back after passing through the cooling equipment. It can be pumped back to the production equipment for reuse, greatly reducing the amount of cold water and often saving over 95%. Cooling water accounts for about 70% of industrial water consumption, therefore, the cooling water circulation system plays a role in saving a large amount of industrial water. Cooling equipment can be divided into open and closed types, so the cooling water circulation system is also divided into two types: open and closed. The design and operation of open systems are relatively complex.
Open
Cooling equipment includes Cooling pond and cooling tower, which mainly rely on water evaporation to reduce water temperature. Furthermore, cooling towers often use fans to promote evaporation, and cooling water is often blown away. Therefore, the open cooling water circulation system must supply fresh water. Due to evaporation and concentration of circulating water, the concentration process will promote salt scaling. Supplementary water has a dilution effect, and its flow rate is often determined based on the concentration limit of circulating water. Usually, the amount of water replenished exceeds the amount lost by evaporation and wind blowing, so it is necessary to discharge some circulating water (called sewage) to maintain the balance of water quantity. In an open system, the cooling water circulation system causes dust, microorganisms, etc. to enter the circulating water due to water flow coming into contact with the atmosphere; In addition, the escape of carbon dioxide and the leakage of materials in heat exchange equipment also alter the quality of circulating water. For this reason, circulating cooling water often needs to be treated, including sediment control, corrosion control, and microbial control. The determination of treatment methods is often related to the amount and quality of make-up water, as well as the performance of production equipment. When using multiple agents, it is important to avoid potential chemical reactions between agents.
Closed
The closed cooling water circulation system uses closed cooling equipment, where the circulating water flows in the pipes and is usually dissipated by air outside the pipes. Except for material leakage from heat exchange equipment, there are no other factors that affect the quality of circulating water. In order to prevent salt scale formation in heat exchange equipment, sometimes cooling water needs to be softened. To prevent corrosion of heat exchange equipment, corrosion inhibitors are often added; When using high concentration and highly toxic corrosion inhibitors, attention should be paid to safety, and the cooling water discharged during maintenance should be properly disposed of.
Components of the cooling circulation system
The flow rate of the medium in the monitoring system pipeline can be monitored. If the flow rate inside the pipeline is too low or too high due to factors such as blockage, the control system can be promptly sent an offline alarm point (when the flow rate is too low) or an online alarm point (when the flow rate is too high) to provide a switch signal, which is called a flow alarm switch.
Overall, the function of the cooling water circulation system is to transfer the heat generated by the equipment or instruments from the equipment through a liquid carrier, and dissipate the heat outside the equipment through a refrigerator, thereby ensuring that the equipment operates within the normal temperature range.
For more system solutions, please consult Brapu engineering technicians