Industrial Refrigeration Accessories for Corrosion Resistance and Durability

1. Main Structure

• Compressor: Utilizes a fully enclosed scroll or screw compressor, offering high energy efficiency and low noise, supporting variable frequency speed regulation to adapt to load fluctuations.
• Evaporator: Typically constructed of titanium alloy or 316L stainless steel, the shell-and-tube design allows for direct heat exchange with the oxidizing fluid, resisting strong acid corrosion and preventing scaling.
• Condenser: Water-cooled (with a cooling tower) or air-cooled (with finned heat dissipation), efficiently exchanges heat with the refrigerant through copper tubes.
• Expansion Valve: Selected Danfoss expansion valves from Denmark precisely control refrigerant flow and pressure, achieving a temperature differential adjustment of ±1°C.

2. Operating Principle

• Direct Cooling Cycle: The refrigerant directly absorbs heat from the oxidizing fluid in the evaporator and releases this heat through compression, condensation, and throttling, creating a closed-loop refrigeration system with a temperature control range of -8°C to 30°C.
• Multi-Level Protection: Built-in protection modules for refrigerant shortage, overheating, and overload ensure stable system operation.

1. Corrosion-Resistant Design

• The evaporator and piping are made of titanium alloy or 316L stainless steel, resistant to corrosion from strong acidic and alkaline oxidizing solutions with a pH range of 1-14.
• The circulation pump is made of stainless steel to prevent metal ion contamination of the tank liquid.

2. Intelligent Control

• PLC touch screen control displays real-time temperature and pressure parameters, supports ±1°C precision adjustment, and provides fault alarms.
• The flow protection device automatically shuts down the system in the event of abnormal water flow, preventing damage.

3. Energy-Saving and High-Efficiency

• The direct-cooling evaporator eliminates the intermediate heat exchange step, reducing energy consumption by 20%-30%.
• The variable-frequency compressor adjusts power according to load, reducing energy waste.

• Hard Oxidation: Controls the bath temperature between -8°C and 2°C to improve the hardness and uniformity of the oxide film.
• Anodizing: Maintains a constant temperature (typically 25°C to 28°C) to prevent overheating and film shedding.
• Electrophoretic Coating: Cools the electrophoretic paint solution to reduce solvent evaporation and enhance coating adhesion.

1. Selection Recommendations

• Select a two-stage compressor based on the oxidation process temperature requirements (e.g., hard oxidation requires a lower temperature).
• Prioritize modular design to facilitate future expansion and maintenance.

2. Maintenance Requirements

• Regularly clean the evaporator scale and condenser dust to prevent decreased heat exchange efficiency.
• Check the refrigerant pressure monthly and refill or replace it promptly.

• Compressor: Adopting a fully enclosed scroll or screw design, it compresses low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gas. It supports variable frequency speed regulation to adapt to load fluctuations in the oxidation process.
• Evaporator: Maintaining a shell-and-tube structure made of titanium alloy or 316L stainless steel, it directly contacts the highly acidic and alkaline oxidizing liquid for heat exchange, preventing corrosion and scaling and improving heat exchange efficiency.
• Condenser: Water-cooled (with a cooling tower) or air-cooled (with finned heat dissipation), it efficiently releases refrigerant heat through copper tubes or aluminum fins to adapt to different environmental requirements.
• Expansion Valve: Electronic or thermal expansion valves precisely control refrigerant flow and pressure, ensuring that temperature fluctuations within the evaporator are within ±1°C.

• Circulation Pump: A corrosion-resistant stainless steel or fluoroplastic pump circulates the oxidizing liquid within the evaporator, preventing metal ion contamination of the tank liquid.
• Filtration Device: The filter drier absorbs moisture and impurities from the refrigerant, protecting the expansion valve and compressor from ice or impurity blockage.
• Control System: The PLC with an integrated touchscreen monitors temperature (-8°C to 30°C), pressure, and flow parameters in real time, supporting automatic alarms, multi-level protection, and historical data logging.
• Liquid Storage Tank: Balances the refrigerant circulation pressure, stores excess liquid refrigerant, and enhances system stability.

• Corrosion Resistance: The evaporator, piping, and pump are constructed of titanium alloy or 316L stainless steel, resistant to corrosion from oxidizing solutions with a pH of 1 to 14.
• Efficient Heat Exchange: The direct-cooled evaporator reduces intermediate heat transfer losses, increasing cooling efficiency by 20% to 30%. The condenser's enhanced heat dissipation design (such as bellows and fin structures) reduces energy consumption.
• Flexible Adaptability: The modular unit supports parallel expansion to meet the cooling needs of large-scale oxidation tanks.

• High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
• The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
• It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
• Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.