What is ejector in petrochemical industry?

An ejector in the petrochemical industry is a fluid machine with a wide range of applications. Here’s a detailed explanation of injectors in the petrochemical industry:


The ejector uses the jet action of the working fluid to transfer energy and mass, which has the role of transportation and mixing.


According to the different working medium and the injection medium, the injector can be divided into various types, such as gas-liquid injector, gas-solid injector, liquid-liquid injector, etc.


The injector is mainly composed of four parts, including a gas nozzle, a suction chamber, a mixing chamber, and a diffusion chamber.

How it works

Steam at a certain pressure is shot at supersonic velocity through a Laval nozzle, which is converted from pressure energy to velocity energy.
At the outlet of the nozzle, the working steam is mixed with the extracted air stream in the mixing chamber due to the low pressure formed by the induction action of the high-velocity steam flow, and energy exchange is carried out.
The mixed gas stream is decelerated and pressurized in the diffuser tube to meet the vacuum requirements in industrial production.


Steam ejectors have a variety of applications in the petrochemical industry, including optimizing the expansion of steam through turbines (e.g., condenser exhaust), vacuum distillation (used to separate volatile components with different boiling points), evaporator vacuum (concentration of liquid substances by boiling solvents), etc.
The ejector is also used in the foam automatic fire extinguishing system and the low multiples foam fire extinguishing system system, which is composed of water inlet pipe, mixing chamber, outlet pipe, diffusion pipe, etc.


In the petrochemical industry, the role of injectors cannot be ignored. They provide the necessary vacuum environment and power support for a wide range of processes through efficient energy conversion and transmission.
In summary, the injector in the petrochemical industry is an important fluid machinery, which provides efficient and reliable power support and environmental protection for various processes in the petrochemical industry through its unique working principle and composition.