December 2005

Fluid Flow

Use ejectors to reduce operating costs

Here are some uncommon applications for the technology

Nayek, S. K., Venkatesh, R., Reliance Industries Ltd.

Though pressure reduction or throttling results in energy waste, it is essential in many processes. The feasibility and economics of using the principle of ejectors to recover energy in such cases will be discussed with reference to one petrochemical unit. The case studies are based on opportunities available in operating plants. Principle of operation. Whenever a fluid at a high pressure is made to expand through a throat or a nozzle, high velocities are encountered at the expense of pressure. If the fluid downstream of the nozzle is passed through a larger cross-section, some pressure is recovered. If the upstream, throat and downstream pressures are indicated by P1, P2 and P3 (Fig. 1) r

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