The process of the turboexpander compressor unit in the ethylene cracker consists of an expander, a compressor, a sealed gas isolation and a lubricating oil system. A mixed gas of methane gas and a small amount of hydrogen is expanded by an expander to absorb a large amount of heat, thereby cooling the gas. The expander intake end valve XV-1401 is used for emergency stop. In an emergency, it can quickly cut off the expander intake and stop the expander to protect the expander. The film actuator A-101 controls the opening degree of the inlet nozzle of the expander to adjust the amount of intake air to control the rotation speed of the expander. The expander side sealing gas is used to prevent the expansion end from leaking and the bearing lubricating oil from entering the expanding gas.
The expander and the compressor shaft temperature sensor are two-stage compression at the compression end of the expansion compressor unit, and the kinetic energy of the expander is used to drive the compressor to pressurize the mixed gas, and the boosted gas is replenished and injected into the intake end of the expander. In order to improve the operating efficiency of the unit. Through this series of processes, the temperature at the exhaust end of the expander can be lowered to below the process requirement of -130e. ASV-1 is the anti-surge pneumatic diaphragm regulating valve of the compressor. When the compressor surge occurs, the return flow of the compression end is controlled, thereby increasing the intake air amount of the compressor to escape the surge working area. Considering that when the anti-surge valve is opened, the gas repeatedly returns between the inlet and outlet of the compressor, which will increase the temperature and affect the normal operation of the compressor, so the reflux gas is cooled by the cooler. The compression end sealing gas acts similarly to the expansion end to block the heat of the compressed gas from affecting the compression end bearing and prevent the lubricating oil from entering the compressed gas to protect the working medium from contamination.
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