【Mechanical Equipment Technology Edition】Daily Question 201709022: Screw Compressors
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This post was last edited by YORK Industrial Refrigeration on 2017-9-23 at 13:54. Starting from now, in order to enhance communication among users, a \"Question of the Day\" campaign has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth for active participation, 10-15 wealth for accurate answers. This question is valid for two days; no scoring will be given after that. Question: What are the common causes of high exhaust temperature in screw refrigeration compressors? Answer: 1. High suction superheat (most common). 2. High oil temperature, which causes wear on the compressor. 3. Imbalance in the internal and external compression ratios. 4. Prolonged operation leads to bearing deformation, thereby causing wear on the internal mechanical components of the compressor. 5. Problems with liquid supply and gas injection in compressors equipped with such systems. ================================ Promotion: Petrochemical sector – “Creative Ideas for Energy Saving” campaign (the second phase is currently in progress). http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry – “My Technical Upgrades”. http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Excessive compression ratio; poor heat transfer in the oil cooler; intake of overheated gas; insufficient fuel injection.
Haha, the moderator is a York unit, while I have a large chiller here. Please join in answering! 1. Excessively high oil temperature (failure of the oil cooler or incorrect connection of the oil cooler pipelines; I encountered this issue with my ammonia compressor units equipped with oil cooling systems – the liquid ammonia pipeline on the cooling side was connected incorrectly, preventing the oil temperature from dropping). 2. Insufficient oil injection volume. 3. An excessive compression ratio due to high exhaust pressure and load. 4. The most problematic issue is a fault in the exhaust temperature gauge – the temperature transmitter is broken! ! !
There are many reasons for high exhaust temperatures: 1. Severe overheating of the intake air； 2. The exhaust-to-intake ratio is too high ； 3. Severe wear of moving parts ； 4. The exhaust pressure is too high; check the high-pressure system and the cooling water system ； 5. Insufficient oil or liquid injection by the compressor, or excessively high oil temperature
There are many reasons for high exhaust temperatures: 1. Severe overheating of the intake air； 2. The exhaust-to-intake ratio is too high ； 3. Severe wear of moving parts ； 4. The exhaust pressure is too high; check the high-pressure system and the cooling water system ； 5. Insufficient oil or liquid injection by the compressor, or excessively high oil temperature
(1) Insufficient fuel injection volume in the compressor. (2) Oil temperature is too high. (3) Excessive inhalation superheat.
Answer: 1. The compression ratio is too high； 2. The oil cooler has poor heat transfer efficiency ； 3. Inhaling superheated gas ； 4. Insufficient fuel injection volume.
Excessive clearance in the compressor cylinder; leakage in the compressor’s safety bypass valve; too high suction temperature of the compressor; interruption of the lubricating oil supply in the compressor cylinder; excessive resistance in the compressor’s return gas pipeline, resulting in slow gas flow and overheating, which raises the exhaust temperature; oil or scale buildup in the condenser; insufficient amount of cooling water in the compressor’s cylinder head cooling jacket, or too high temperature of the cooling water; excessive resistance in the compressor’s exhaust pipeline
Excessively high compression ratio; poor heat transfer in the oil cooler; intake of overheated gas; insufficient fuel injection volume – any of these could be the cause