How to solve the problem of exhaust oil in the screw air compressor of textile enterprises and food industry

In some relatively special production industries, there are relatively high requirements for the gas discharged from the screw air compressor, especially in the textile industry and the food industry, which basically require the compressed air to have a particularly low oil content, basically achieving oil-free compression Air. So when the failure of the screw air compressor exhaust with oil occurs, how should we solve this problem?

The main causes of oily exhaust faults:

1. The oil-gas separation core is damaged

During the operation of the screw air compressor, if the oil separation core is damaged, such as breakage or perforation, it will lose its function of oil and gas separation. That is to say, the mixed gas and the exhaust pipe of the compressor are directly connected, so a large amount of oil is not separated, and it will be discharged out of the body together with the gas, which causes an oil-carrying fault during the exhaust process.

2. The oil return pipeline is faulty

During the working process of the screw compressor, the oil return pipeline shoulders an important responsibility. A pressure difference will be formed between the inside of the oil separation core and the compressor inlet. Under the action of this pressure difference, the oil return pipeline is responsible for the oil The oil collected at the bottom of the separator element is conveyed back to the compressor to be used in the next cycle. If the oil return line is clogged, broken, installed incorrectly, etc., the oil accumulated at the bottom of the oil separation core cannot be transported back to the compressor, resulting in too much oil accumulated at the bottom, and this part of the oil will be discharged with the gas. There will be oily phenomenon in the exhaust process.

3. System pressure control is too low

During the operation of the screw compressor, if the system pressure control is too low, the gas flow rate in the separator will be too fast, then the function of the separator will not be fully reflected, and it will cause the separator core to enter the next link. The oil content of the gas inside is too high, which exceeds its separation range, which leads to incomplete oil-gas separation, and oil-carrying faults occur during the exhaust process of the compressor.

4. The minimum pressure valve fails

During the operation of the screw compressor, the function of the minimum pressure valve is to ensure that the system pressure is controlled above the minimum pressure during operation. If the minimum pressure valve fails, the minimum pressure of the system cannot be guaranteed, resulting in an oil-carrying fault during the flat exhaust process.

5. Too much cooling oil added to the compressor

Before the operation of the screw compressor, if too much cooling oil is added, then during the operation of the compressor, due to the high oil level, although the separation system separates the oil and gas, the gas will still be released during the gas discharge. The cooling oil is involved in the gas and discharged, causing the oil content in the discharged gas to be too high, resulting in oil-carrying faults.

6. The quality of cooling oil is unqualified

Before the compressor is running, unqualified cooling oil is added, or the cooling oil exceeds the applicable time, and the cooling effect cannot be achieved. Then, during the operation of the screw compressor, the cooling oil loses its function and cannot cool and separate the oil and gas. Then in the exhaust process, there must be an oil failure.

Only after knowing the cause of the fault causing the oil in the compressed air can we know how to deal with the fault.

Here are some solutions to common faults:

01. Oil separation core damage problem

Damage to the oil separation core is a common phenomenon, so the equipment should be inspected before the operation of the screw compressor, the operating procedures should be strictly followed during use, and the equipment should be maintained regularly after use. If the oil separation core is found to be damaged or perforated, it should be replaced in time to ensure the normal operation of the equipment.

02. There is a problem in the oil return circuit

During the operation of the equipment, if the oil return circuit is blocked, first check the pressure drop of the separator. If there is no problem with the pressure drop, the core of the oil separator needs to be cleaned. If the core of the oil separator breaks, it must be timely Make a replacement.

03. The system pressure control is too low

For operators, they should be familiar with the control pressure of the equipment, and when a problem is found, the load of the system should be reduced so that the system pressure reaches the rated working pressure.

04. Minimum pressure valve failure problem

In actual operation, if the minimum pressure valve is found to be invalid, it must be replaced, and the work will be performed after the replacement is completed.

05. Too much cooling oil added to the compressor

When adding cooling oil to the compressor, you should first understand the theoretical value of how much cooling oil should be added to the equipment. Special personnel should be responsible for adding cooling oil. Generally, it should be controlled below the middle of the sight glass.

06. Cooling oil quality problem

The addition of cooling oil should be strictly in accordance with the requirements of the equipment for cooling oil, because different equipment has different requirements for cooling oil. After adding, the adding time should be recorded, and when the cooling oil reaches the service life, it should be replaced on time. The quality of the added cooling oil should be strictly controlled to prevent adding unqualified cooling oil.

 

Sollant Group-Professional Compressed Gas Solutions Provider