Steam ejectors use steam or gas instead of moving parts to compress a gas. In a jet or ejector, a relatively high-pressure gas, like steam or air, expands through a nozzle converting that pressure or potential energy to velocity or kinetic energy. The jet of high-velocity steam or gas entrains the gas to be evacuated or pumped in the suction of the ejector. The resulting mixture enters the diffuser where velocity energy is converted to pressure at the ejector discharge.
Steam jet ejectors use steam as the high-pressure motive fluid to create deep vacuum. Whereas air jet ejectors are utilized when the required capacity is low or steam is not available or desired. The simple construction and lack of moving parts result in a reliable pump with little maintenance, low initial cost that is custom-designed with no limit on size, capacity or materials of construction. These attributes make steam jet and air ejectors the ideal solution for the most demanding applications in oil & gas, chemical and electric power industries.
Nash is globally recognized for assembling the most cost-effective steam jet and air ejectors. Application engineers ensure maximum performance benefits while optimizing a hybrid system customized to processes, applications and technology requirements. NASH steam jet and air ejectors minimize greenhouse gas emissions and operational efficiency while improving system stability.
Steam jet ejectors pass steam through an expanding nozzle. The nozzle controls the expansion of steam and converts pressure into velocity; thus, creating a vacuum to transfer gases.
An ejector operates on a mass basis, not by displacing volume. Ejectors are better suited to handling gases with low molecular weights and when operating at low absolute pressures. These systems are ideally suited to high vacuum applications but are only marginally useful as compressors.
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