Unlike traditional compressors, ejectors do not contain moving parts. They operate on the Ejector-Venturi Principle to convert the pressure of a motivating fluid into velocity that entrains the fluid. This fluid, steam, or gas enters the Venturi diffuser, where its velocity is converted back into pressure sufficient to discharge against a predetermined amount of back pressure.
The two main types of ejectors are steam ejectors and liquid ejectors.
A steam ejector consists of four primary components:
A steam ejector vacuum system also contains a valve—a crucial component that controls the flow of steam through the unit and regulates the pressure difference between the outlet and inlet. Because of their precise control over the vacuum, steam ejectors are useful in a broad range of industrial applications.
Also called a liquid ejector, a water jet ejector vacuum system is a jet pump, motivated by high-pressure liquids. The unit uses the kinetic energy of the pressurized liquid to discharge the mixture against a counter pressure. Liquid ejectors typically operate using solvents, water, or any other clear liquid. They create an effective vacuum within the device corresponding to the liquid’s vapor pressure. For higher vacuum applications, liquid ejectors can be combined with a steam ejector vacuum system to achieve peak performance.
The purpose of an ejector is to create a vacuum within a system. This can be accomplished by injecting liquid or steam into the system at a high velocity and pressure, causing the gasses or air inside the unit to be expelled from the system at a high velocity. The process creates an internal area of low pressure, resulting in a vacuum.
Single-stage ejectors are common vacuum devices in automation, especially pick-and-place robots. Using the Venturi effect, these ejectors use compressed air to produce a vacuum. Compared to multi-stage ejectors, single-stage vacuum ejectors are simpler and create stronger vacuums.
Single-stage steam ejector vacuum systems are capable of handling both condensable and non-condensable vapors and gasses. They are also suitable for non-sensitive applications where small amounts of liquids or solids do not result in operating issues.
Slightly superheated or saturated steam is often utilized for industrial production processes. The best examples of this can be found in the following industries:
Single-stage steam ejector vacuum systems are capable of handling both condensable and non-condensable vapors and gasses. They are also suitable for non-sensitive applications where small amounts of liquids or solids do not result in operating issues.
The Jetomat® Baelz 590 is a controllable steam ejector with cooling water injection. Also known as a desuperheater, this system can lower the temperature of dry, superheated steam (exceeding 212 °F) as it enters the device by injecting a certain quantity of water into the steam flow. The resulting saturated steam assists with industrial heat transfer applications in refineries, chemical plants, and other facilities.
The condensation enters the system slightly downstream from the Venturi throat, sprayed at a minimum pressure of 5 to 10 psi into the vapor flow above the steam line pressure. This results in a relative velocity between the steam and condensate that produces the smallest possible droplet size. The superheated steam can be effectively reduced to 5-10 °F above saturation.
Desuperheaters offer the following benefits:
Baelz NA provides customers with quality energy-saving products and services for a wide range of industrial heating and cooling applications. As the official supplier of Baelz Automatic engineered systems and components in North America, Baelz NA is dedicated to delivering top-quality products with shorter lead times and local representation. In addition, our technical sales professionals have the expertise to help customers with component pricing, selection, and support.
When you partner with Baelz NA, you’ll experience the following benefits:
High-quality products
Long service life
Cost savings
System optimization
Reduction of system components
Lower energy consumption
Contact us today to learn more about our comprehensive selection of vacuum ejectors. You can also request a quote for specific pricing information regarding your next project.
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