The way of benzene refinement loop gas compressor pressure degree is analyzed and changed
The effect of the circulating gas flow rate The appropriate circulating gas flow rate not only satisfies the hydrogen-to-oil ratio of the Leto system, but also removes the heat released by the Leto system and equilibrates the reboilers. If the circulation quantity is too low, the compression ratio of the compressor changes greatly, causing the over-temperature phenomenon of the compressor to occur. The over-temperature causes the mechanical strength of the internal components of the compressor to decrease, posing a hidden danger.
Operation and design reasons The circulating gas must be fully separated by the gas-liquid separation tank before entering the compressor. Sometimes the separation of the gas and liquid in the separation tank is not good. Some of the liquid that should be separated enters the compressor with the circulating gas, or passes through the MEA. The circulating gas at the top of the absorption tower is foamed by the MEA system, and impurities such as water or MEA of the system are passed through the separation tank to enter the compressor inlet. Water or impurities entering the cylinder may cause internal components such as piston rings and packing to break due to vigorous movement, causing the compressor temperature to rise, and sometimes the operation may be too much or too fast due to the compressor loading or subtracting, or passing through the top of the MEA absorption tower. The temperature of the circulating gas entering the compressor is abnormal, which causes the compressor to overheat, and even more causes the compressor temperature to interlock and jump, posing a safety hazard.
Reasons for quality of inspection The compressor inlet filter is sometimes not cleaned due to inspection and maintenance, increasing airflow resistance and motor power. Imported impurities are sucked into the cylinder and cause internal components to be seriously worn, resulting in over-temperature of the compressor.
Improvement measures (1) Strictly control the cylinder lubricant level. When adding lubricating oil, strictly follow the principle of three filtrations to avoid impurities entering the cylinder, and strengthen the inspection force to ensure that the cylinder lubricating oil level is controlled within 50% and 80%.
(2) Ensure normal circulating gas flow. At full load, the circulating gas flow rate is controlled within the management value of 950010500Nm3h-1. When the flow rate is too low, a certain amount of H2 should be replenished to the Leyto system through the supplemental gas compressor in time to ensure that the circulating gas flow fluctuates within the normal range, from the source. Avoid circulating machine over temperature.
(3) Establish employee responsibility in terms of operations. It is found that the gas-liquid separation tank should be discharged in time when the liquid level is high, and the temperature of the circulating gas at the top of the absorption tower of the MEA system is controlled to be about 4,346, so as to prevent impurities such as water from entering the compressor through the separation tank due to foaming of the MEA system. At the same time, for the initial design of the separation tank gas-liquid separation effect, add 2 volumes of 05m3 filters before the compressor inlet, usually placed in parallel and parallel, thus increasing the effective space of the separation tank and avoiding liquid ingress. The compressor makes the temperature abnormal. Through the observation in recent years, the operation effect is good. In addition, the compressor load and subtraction should follow the principle of less to more, until the load is full, and there should be a certain time interval in the middle to ensure normal fluctuation of the compressor temperature.
(4) Strengthen the training of maintenance personnel to ensure the quality of maintenance, timely clean or replace the inlet filter, ensure that the pressure difference between the compressor inlet and outlet is 03MPa, reduce the human cause and avoid the abnormal temperature of the compressor.
Before and after the transformation, the temperature and pressure of the compressor are compared. The process value is modified before the transformation. Import pressure / MPa50534951 inlet temperature / 43464245 outlet pressure / MPa53565255 outlet temperature / 627258683 Conclusion After the above improvements and optimization operations, the compressor operating conditions are improved, the operating temperature can be improved Control, the operation cycle can be extended, the number of inspections is greatly reduced, the compressor is prevented from parking at least 4 times a year, the qualified product is discharged 4 hours at a time, and the parking loss for 4 times is at least 200,000 yuan, thereby saving maintenance costs every year. 10,000 yuan (including valve parts, piston rods, packing, etc.), greatly reducing the amount of maintenance work, ensuring long-term, safe and stable operation of the compressor.
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