Ethylene Glycol Refrigeration Unit

Introduction

Ethylene glycol is an antifreeze used in industrial cooling units to protect against freezing and as a rust inhibitor. The percentage of ethylene glycol used in a glycol and water mixture is determined by the lowest outdoor ambient temperature and the temperature of the application loop.

For the cryogenic refrigerator using ethylene glycol solution, we call it ethylene glycol refrigeration unit. The outlet water temperature is generally set below - 10 ℃, and the specific temperature requirements are subject to the user's needs. Ethylene glycol refrigeration units are common in chemical plants. In order to ensure the safe and stable operation of the units, many chemical plants also strictly require the refrigeration units to take explosion-proof measures, which is often referred to as explosion-proof chillers.

A ethylene glycol refrigeration unit funnels a glycol-water coolant mixture from the refrigeration unit through thermal heat exchanger piping, absorbing heat from your industrial process and warming the coolant. Next, the warmed coolant returns to the refrigeration unit to repeat the cooling process.

The structural composition of the refrigerator is roughly the same, which is composed of compressor, evaporator, condenser, throttling element and electric control system. However, for the glycol refrigeration unit, it is a low-temperature compressor and is equipped with economic separator and other components, which are still different.

Main components
1. Compressor: The glycol refrigeration unit adopts Hanbell screw compressor or Bitzer screw compressor, both of which are imported brands, with more stable operation and more reliable quality. You can rest assured when using them.

2. Condenser and evaporator: The condenser of glycol refrigeration unit is the shell and tube water-cooled condenser, and the evaporator can be equipped with stainless steel tubular heat exchanger or brazed plate heat exchanger, both of which are made of good materials to avoid the occurrence of internal leakage of the product and to a large extent ensure the operation of glycol refrigeration unit.

3. Control system: the standard configuration is a single-chip controller, with a position setting to turn on and off the temperature difference between refrigeration. The Siemens S7-200 PLC and modules are selected. The whole system of the glycol refrigeration unit is a fully closed system. The low temperature does not absorb moisture in the air. The system will not raise the pressure due to high temperature during operation, and the low temperature will automatically supplement the heat conduction medium.

4. Safety protection: high voltage protection, water cutoff protection, over-current protection, leakage point protection, phase continuity and phase failure protection, high temperature protection, sensor failure, low liquid level alarm and other multiple safety protection.

Working Principle

1. Compression In order to keep the pressure in the evaporator low enough to ensure that the refrigerant is at a sufficiently low boiling point temperature, the compressor is used to extract the vaporized refrigerant gas, that is, to compress the refrigerant vapor of low temperature and low pressure into the refrigerant gas of high temperature and high pressure. When the suction speed of the compressor is greater than the evaporation speed of the refrigerant, the evaporation pressure will be reduced, and the evaporation temperature will also be reduced; Conversely, the suction speed of the compressor is less than the speed of the refrigerant, and the evaporation temperature and pressure will increase accordingly.

2. The refrigerant with high temperature and pressure is condensed into liquid in the condenser. In the condenser, the refrigerant releases heat to air or water that is lower than its temperature. This heat includes the heat absorbed by the refrigerant during evaporation in the evaporator and the heat converted by the compressor during compression. Special attention: the temperature of air or water must be lower than the temperature of refrigerant, otherwise the refrigerant cannot release heat, that is, the temperature of cooling medium (cooling tower water or air) must be lower than the temperature of refrigerant gas at the compressor outlet.

3. Throttling passes through the throttler, and the pressure of refrigerant drops from the condensation pressure to the evaporation pressure. The liquid from the condenser is stored in the liquid receiver. At this time, the refrigerant is under normal temperature and high pressure. After passing through the expansion valve, the boiling point decreases due to the pressure drop. The liquid enters the evaporator and is easy to absorb heat and evaporate.

4. The low temperature and low pressure refrigerant liquid vaporized through the throttle is exchanged with the refrigerant in the evaporator, and becomes saturated or superheated steam after absorbing heat, so as to be compressed by the compressor.
Glacier refrigerants are used in the refrigeration industry, completely solving the three major problems of traditional refrigerant corrosion equipment, low efficiency and environmental pollution. The product has excellent performance, showing excellent performance in the field of ultra-low temperature and high temperature!

Advantages

1. Adopt the best (semi-hermetic) screw compressor from abroad, and operate credibility, high efficiency, easy to
maintain, exact volume control, a wide range of application. The system adopts the latest asymmetric rotor profile. Build-in
pressure drop lubricant to system with low vibrations, sound emissions,high sealing performance.

2. The human machine interface configures a full touch screen, which enables automatic control and accurate monitoring. the advantages of unit: waterproof,dust-proof, corrosion resistant, long life. Step or steppless capacity control, the unit ensure that it bring into the most energy-saving effective in any load conditions.

3. Due to use heat copper tube and high efficiency compressor with high effective thermal expansion current-saving device, the unit will operate in stability, longer and effectively.

4. Chiller unit adopts a reliable safety protection device: to prevent compressor starting frequently, over-current protection, overheat of motor protection, prevent freezing, sight glass in liquid, oil heating protection, phase protection, HV/LV protection, discharge high-temperature protection, safety value, soluble clock, water shut-off protection, and so on.

5.Field of application: Laser, Chemical, Plating and oxidation, Precision Instruments, Printing, Ink, Paper, Metal, Casting, Blowing, Injection Plastic Industry, Food Processing, Pharmaceutical Industry, Electronic Circuit Board, Reflow Soldering , Interlayer Cooling, Space Purification Treatment, Ultrasonic Cleaning, Bath temperature control, Cutting and Welding, Surface Treatment, Aluminum, Glass Crafts, Jewelry Processing, Leather and Aquaculture .

6. A full intelligent control system and non-stop running within 24 hours.

Parameters and Specifications of Some Standard Models

Maintenance requirements
When using the ethylene glycol refrigeration unit, maintenance is very important. It is strictly required to use the unit according to the steps. Before use, a plan should be set for the ethylene glycol refrigeration unit, and the compressor, condenser, evaporator, water pump, cooling tower, water pipe, etc. of the ethylene glycol refrigeration unit should be checked regularly. Regular cleaning and maintenance should be carried out to ensure that each accessory and important part can achieve a good use effect.

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