Semi closed screw compressor for chiller unit | Chemical process cooling constant temperature control load adjustment scheme
Industrial chillers are commonly used for chemical process cooling, with a temperature control requirement concentrated between 5 ℃~25 ℃ and a temperature control accuracy of ± 0.8 ℃. Semi enclosed screw refrigeration compressors are preferred.
The chemical cooling load is continuous and stable, with an annual operating time of up to 7500 hours. The screw compressor has stepless energy regulation of 25% to 100%, which reduces energy consumption by 13% compared to piston units.
The Xitelidou semi enclosed screw compressor is compatible with two types of chiller structures: water-cooled and air-cooled. R507 and R404A are the mainstream refrigerants in process cooling scenarios, while R32 is only used in specific explosion-proof licensed workshops.
There is a lot of dust and corrosive gases in the chemical workshop, and the ventilation rate of the machine room should not be less than 6 times per hour. Environmental corrosion can accelerate the corrosion of the compressor casing and wiring terminals, increasing the probability of failure.
The clearance between the rotor of the screw compressor is fixed at the factory, and the system impurity content exceeds 40mg/kg. Long term operation will cause rotor wear, and the refrigeration capacity will decrease by about 8% annually, resulting in high maintenance costs.
The water quality control of the condenser of the chiller unit is crucial. When the hardness of the circulating water is higher than 250mg/L, the scaling rate of the pipe wall accelerates. For every 0.2mm increase in thickness, the heat transfer efficiency decreases by 18%.
The foreign trade procurement of chemical process cooling projects is mainly carried out by the engineering general contractor. The orders for chemical industrial parks in Central Asia and Southeast Asia continue to increase, and customers prioritize requesting continuous operation stability test data for the units.
The requirement for the separation efficiency of refrigeration oil in screw units is ≥ 99.5%. After the oil separation fails, a large amount of refrigeration oil enters the process side heat exchanger, and the oil film adheres to the heat exchange surface, directly weakening the heat transfer capacity.
Which is better, screw or piston compressor? In stable continuous process cooling scenarios, screw models have longer maintenance cycles and are suitable for 24-hour uninterrupted operation in chemical cooling conditions.
Export chemical supporting chillers, in addition to CE certification, some customers require explosion-proof certificates, and the cost of explosion-proof modified compressors has increased by about 30%. The demand should be confirmed in advance during the selection stage.
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FAQ
What is the conventional temperature control accuracy of chemical chillers? Most processes require constant temperature control of ± 0.8 ℃.
What is the load adjustment range of the screw compressor? Regular support for 25% to 100% stepless adjustment.
How hard is the circulating water that can easily cause scaling in the condenser? The risk of scaling increases significantly when the hardness exceeds 250mg/L.
What is the minimum separation efficiency requirement for screw oil separators? The separation efficiency needs to reach 99.5% or above.
What is the ventilation standard for chemical plant rooms? The ventilation rate shall not be less than 6 times per hour.
6. How much does the rotor wear decay due to excessive impurities in the system? Impurities exceeding 40mg/kg result in an annual cooling capacity decay of approximately 8%.
7. Changes in procurement costs for explosion-proof screw units? After the explosion-proof renovation, the overall cost of the machine increased by about 30%.
