![]() ![]() Sometimes precondensers, booster condensers and aftercondensers are also used.Ĭondensers may be barometric or surface. Multistaged ejectors often promote economy by including intercondensers between some of the stages to reduce the load to the following stages. For this reason, the spindle-operated ejector provides high off-design efficiency, which is very handy if operating conditions must vary. In this case, the spindle is essentially changing the dimensions of the ejector’s internalities is, creating a new single-point design. In a spindle-operated ejector, the nozzle and tapered spindle work together similar to a needle valve. They usually save as much as 10% to 20% in motive steam, compared with single-nozzle units designed for the same conditions. Multiple-nozzle ejectors are more efficient. The single-nozzle, fixed orifice is the simplest type of ejector. Single-nozzle units are also available with an automatic spindle for special applications. They are applied in processes such as crystallization, deaeration, drying, cooling, high vacuum distillation and deodorization.Įjector systems range from the simple, single-ejector stage to very complex systems with as many as six ejectors in combination with intercondensers.Įjectors are available in either single-nozzle or multiple-nozzle designs. Vacuum Producers: Ejector-based systems are particularly appropriate as primary vacuum producers, particularly where motive steam is almost always available. In the compressors recycle waste steam and low-pressure water vapor discharge, reducing energy consumption by 30% or more. Thermocompressors are ejectors applied to recompressing spent steam and process fluids. The two major functions of ejectors are as follows: Very often, the motive fluid is steam and the device is called a “steam jet ejector.” Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge (Fig. ![]() Instead, it uses a fluid or gas as a motive force. Very simply, an ejector is a pumping device. They are easy to install, operate and maintain.Because they have no moving parts, they are reliable vacuum producers.No source of power is required other than the motive gas. ![]()
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