August 2020

Columns

Optimization: Calculate a gas-gas ejector’s power consumption and efficiency

Gas-gas ejectors are seeing more applications in the oil and gas industry.

Al-Alshaikh, T. H., Alamer, A. A., Saudi Aramco Dhahran

Gas-gas ejectors are seeing more applications in the oil and gas industry. Ejectors consume a significant amount of energy to raise a low-pressure gas to a relatively higher value. This article proposes a method to calculate the ejector input and output power and efficiency. This information will enable an economic decision, based on a proper lifecycle cost analysis, on the use of an ejector to boost a low-pressure gas stream. A gas-gas ejector is used to raise the pressure of a suction gas, allowing it to reach the inlet stream pressure of an operating plant or the inlet pressure for a higher-pressure compressor (FIG. 1). To do this, the gas-gas ejector uses a large amount of high-pressure

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