Guide for Corrosion Prevention Upgrade of Chemical Cooling Equipment, Industrial Low-Temperature Unit Operating Condition Adaptation Plan

The chemical production process is accompanied by corrosive gases and high-humidity environments. When standard refrigeration units are used for a long time, copper tubes and sheet metal casings quickly rust, resulting in frequent refrigerant leakage and unit shutdown failures, directly interrupting production line operation. In the chemical cooling scenario, special corrosion prevention upgrades must be carried out for the equipment. Based on different chemical corrosion levels, the heat exchange structure and protection process should be adjusted. This article outlines a complete corrosion prevention renovation plan.
I. Classification of Corrosive Environments in Chemical Workshops and Corresponding Loss Phenomena
Mild Corrosion Environment: Ordinary auxiliary material processing, with only trace water vapor evaporation, standard spray coating of the casing can be used for a short period, and slight rusting occurs within 1-2 years; Moderate Corrosion: Daily chemical and fine chemical production, with trace acid and alkali evaporation, thin copper tubes develop point corrosion and perforation within 6-12 months; Severe Corrosion: Chemical raw material synthesis workshop, with high-concentration corrosive gases, standard units experience pipe rusting and fan damage within 3 months.
Different corrosion levels correspond to differentiated equipment upgrade plans. Using basic corrosion prevention configurations uniformly will not achieve the expected corrosion prevention effect, and the equipment loss rate remains relatively fast.
II. Core Transformation Processes of Three Layers of Corrosion Prevention Upgrade
First Layer: Thickening of heat exchanger copper tubes, using thick-walled copper tubes to enhance the basic corrosion resistance; Second Layer: Special corrosion-resistant coatings are sprayed on the fins and copper tubes to prevent direct contact of corrosive gases with the metal; Third Layer: Double-layer rust prevention spraying of the entire machine's sheet metal casing, adding sealing and corrosion-resistant protective sleeves to the pipe joints to reduce water vapor and gas infiltration into the internal structure.
After three layers of corrosion prevention upgrade, the service life of the unit in a moderately corrosive chemical workshop can be increased by more than twice, significantly reducing equipment replacement and downtime maintenance costs, and is an indispensable renovation link in the chemical cooling project.
III. Additional Configuration for Extra Operating Conditions of Chemical Units
Chemical workshops are mostly 24-hour continuous production. The unit structure is strengthened for continuous operation design, and heavy-load compressors are selected; Increase high-temperature heat dissipation optimization to adapt to the high-temperature workshop environment; The electrical control box is treated with sealing, dust-proof, and corrosion prevention processing to avoid corrosion of circuit components by corrosive gases and prevent short-circuit faults.
Shaoxing Xueying Refrigeration can customize corrosion prevention upgrade industrial refrigeration units according to the corrosion level of the chemical workshop. The condenser and cooling fan use thickened corrosion-resistant copper tubes and multi-layer protective coatings. The entire machine undergoes long-term load testing in simulated high-temperature and corrosive environments before leaving the factory, suitable for various industrial cooling conditions such as fine chemical and new material processing, and supports domestic chemical projects and export customization for overseas chemical production bases.
IV. Methods for Corrosion Prevention Maintenance of Chemical Equipment to Extend Service Life
The workshop maintains ventilation to reduce the concentration of corrosive gases; Clean the corrosion deposits on the heat exchanger surface every quarter, check the damaged coating positions and timely reapply coating; Every year, disassemble the fan and pipe joints, check for rusting hazards; Regularly test the airtightness of the refrigerant pipes to handle minor corrosion perforations in advance. Summary
The corrosive environment in chemical production significantly accelerates the aging of refrigeration equipment, and the basic standard models cannot be used stably for a long time. Based on the corrosion level of the workshop, multiple layers of anti-corrosion upgrades such as copper tubes, coatings, and enclosures are carried out, combined with the optimization of heavy-load continuous operation structure, it can meet the long-term low-temperature cooling requirements of chemical production lines, reducing downtime losses of the production lines.