Specification for working condition boundary, explosion-proof selection and matching of semi enclosed screw compressors for chemical process cooling
Chemical process cooling screw compressors are commonly used for reaction vessels and material cooling, with an evaporation temperature range of -10 ℃ to 20 ℃ and complex medium conditions. Many chemical cooling projects require explosion-proof motors with an explosion-proof rating of Ex d II BT4 and a motor housing temperature controlled within 135 ℃. The Xiteliduo screw model is available in an explosion-proof version. The chemical cooling load dynamically changes with the reaction progress, and the load fluctuation can reach up to 60% of the rated value. The screw slide valve has obvious advantages in stepless adjustment and adaptation. A single 100kW semi enclosed screw compressor with a 5 ℃ evaporation condition is suitable for continuous cooling of 5 5 cubic reaction vessels. POE46 is selected as the refrigeration oil for the compressor. There are trace amounts of corrosive gases in the chemical environment, and the antioxidant additive level of the oil needs to be improved. The compressor is matched with the condenser, and many chemical cooling systems use shell and tube water-cooled condensers, with a cooling water temperature difference controlled between 5 ℃ and 8 ℃. The selection parameters of cold storage compressors cannot be directly transferred to chemical cooling, as the heat release of chemical media is uncontrollable, and a cooling capacity margin of more than 25% must be reserved. The exhaust pressure of the semi closed screw compressor is controlled within 15.5 bar for condensation at 40 ℃ under water cooling conditions, and the scale in the water cooling system needs to be cleaned regularly. The continuous operation cycle of chemical process cooling projects is long, and the maintenance cycle of screw rotors is 18000 hours, which is higher than that of screw units in food cold storage. The sealing requirements for the explosion-proof box of the compressor wiring are strict, and the sealing failure at the cable entry position can cause safety hazards due to the infiltration of flammable gases. Foreign trade chemical projects in Türkiye and Russia have many inquiries, and the local explosion-proof certification system is different from the EU CE explosion-proof directive. The low suction pressure of the compressor often leads to scaling on the material heat exchange side, insufficient flow rate, and changes in medium temperature in chemical cooling scenarios. Compared to piston compressors, screws have a lower failure rate in chemical continuous cooling scenarios, reducing production losses caused by process shutdowns. Many chillers are used for chemical cooling, and screw compressors are the core host of chillers, with stable control of outlet temperature ranging from 5 ℃ to 12 ℃. The ventilation frequency of the chemical cooling compressor room shall not be less than 8 times per hour to ensure the rapid discharge of leaked refrigerant. 【 Implant 10 popular search keywords 】 Chemical process cooling, chiller, semi closed screw compressor, screw refrigeration compressor, cold storage compressor selection, compressor refrigeration oil model, compressor and condenser matching, low compressor suction pressure, compressor wiring diagram, CE certification FAQ
What is the standard evaporation temperature for chemical cooling screws? -10 ℃~20 ℃, commonly used for cooling reaction kettle materials.
What are the common grades of chemical explosion-proof motors? Ex d II BT4， The shell temperature is ≤ 135 ℃.
How many reaction vessels can be matched with a 100kW screw? Five 5-cube reaction vessels are continuously cooled.
Is there an explosion-proof version of Xiteliduo screw? Support customization of explosion-proof motors.
What is the recommended amount of cooling capacity for chemical cooling? Suggest reserving more than 25% to cope with fluctuating loads.
What is the temperature difference control for the cooling water of the water-cooled condenser? 5 ℃ to 8 ℃ is the conventional design range.
How long is the maintenance cycle for chemical screws? Continuous operating conditions can reach 18000 hours for rotor maintenance.
What are the ventilation and air exchange requirements for chemical plant rooms? No less than 8 times per hour.
