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Abstract
Lithium bromide absorption refrigeration systems are widely used in air conditioning, industrial cooling, and other fields due to their energy-saving and environmentally friendly advantages. However, the long-term operation of the system can lead to problems such as scaling and corrosion of the cooling water. This paper focuses on the research and application of water stabilizers in the cooling water of lithium bromide absorption refrigeration systems. Through the analysis of the causes of water quality problems and the selection of appropriate water stabilizers and dosages, the stability and safety of the cooling water can be improved, and the service life of the refrigeration system can be prolonged.
Keywords: lithium bromide absorption refrigeration system, cooling water, water stabilizer, corrosion, scaling
Introduction
Lithium bromide absorption refrigeration systems are widely used in air conditioning, industrial cooling, and other fields due to their energy-saving and environmentally friendly advantages. The basic principle of the system is to use lithium bromide as the absorbent and water as the refrigerant to achieve refrigeration through absorption and desorption processes. However, during long-term operation, the cooling water in the system is prone to problems such as scaling and corrosion, which will affect the performance and service life of the system. Therefore, it is necessary to study and apply water stabilizers to improve the water quality and prolong the service life of the system.
Causes of Cooling Water Problems
The cooling water in the lithium bromide absorption refrigeration system is in contact with metal pipes, heat exchangers, and other equipment, which can cause corrosion and scaling problems. The main causes of water quality problems are as follows:
1. Corrosion: The corrosion of the cooling water is mainly caused by the presence of oxygen and other corrosive substances in the water, which will cause the metal parts in the system to rust and corrode. The corrosion products will accumulate in the pipeline and equipment, leading to blockage and reduction of heat exchange efficiency.
2. Scaling: Scaling is mainly caused by the precipitation of calcium and magnesium ions in the water, which will form scale on the surface of heat exchange equipment and reduce the heat transfer coefficient.
3. Microbial growth: The cooling water system is an ideal breeding ground for microorganisms such as bacteria and fungi, which will form biofilm in the pipeline and equipment, leading to fouling and clogging of the system.
Effects of Water Quality Problems
The poor water quality in the lithium bromide absorption refrigeration system will affect the performance and service life of the system in several aspects:
1. Reduction of heat exchange efficiency: The scaling and fouling of the system will reduce the heat exchange efficiency, leading to increased energy consumption and reduced cooling capacity.
2. System damage: Corrosion of the system will cause damage to metal pipes and equipment, leading to leakage and failure of the system.
3. Shortened lifespan: The accumulation of scaling, fouling, and corrosion products will cause damage to the system over time, leading to a shortened lifespan.
Water Stabilizer Selection and Application
To improve the water quality of the lithium bromide absorption refrigeration system, water stabilizers can be used to prevent corrosion, scaling, and microbial growth. The selection and application of water stabilizers should consider the following factors:
1. Compatibility with the system: The water stabilizer should be compatible with the materials used in the system and should not cause damage or corrosion to the equipment.
2. Dosage control: The dosage of the water stabilizer should be controlled within a proper range to achieve the desired effect without causing adverse effects on the system.
3. Environmental protection: The water stabilizer should be environmentally friendly and safe for human health.
Commonly used water stabilizers include organic phosphonates, polyacrylic acid, and polycarboxylates. Organic phosphonates have excellent scaling and corrosion inhibition properties and are effective in preventing scaling caused by calcium and magnesium ions. Polyacrylic acid and polycarboxylates have excellent dispersing and chelating properties and are effective in preventing scaling caused by a variety of ions. In addition, some water stabilizers also have antimicrobial properties to prevent microbial growth in the system.
Conclusion
The stability and safety of the cooling water in the lithium bromide absorption refrigeration system are important factors affecting the performance and service life of the system. Through the selection and application of appropriate water stabilizers and dosages, the water quality problems of scaling, corrosion, and microbial growth can be effectively controlled. It is essential to pay attention to the compatibility, dosage control, and environmental protection of the water stabilizers used. With the improvement of the stability and safety of the cooling water, the service life of the system can be prolonged, and the energy-saving and environmentally friendly advantages of the lithium bromide absorption refrigeration system can be fully realized.