How does a injector work?

There is currently no animation for the ejector, but it would be better to create one using FLASH based on the relevant principles from chemical engineering, as this will help reinforce understanding

A hydraulic ejector is a mechanical device with three effective functions: vacuum creation, condensation, and drainage. It uses water flow under certain pressure to be ejected through nozzles arranged symmetrically at an inclined angle, converging at a single focus. Due to the high velocity of the jetted water flow, a negative pressure is created in the surrounding area, resulting in a vacuum inside the chamber. Additionally, as the secondary steam comes into direct contact with the jetted water flow and heat exchange occurs, the vast majority of the steam condenses into water. The small amount of steam that does not condense, along with any non-condensable gases, is mixed and compressed due to friction with the high-speed water jet, and is then expelled through the diffuser tube, thereby creating an even higher vacuum inside the chamber. Hydraulic ejectors are widely used, primarily in vacuum and evaporation systems, for processes such as vacuum pumping, vacuum evaporation, vacuum filtration, vacuum crystallization, drying, and deodorization. They are devices in high demand in industries such as sugar production, pharmaceuticals, chemicals, food processing, salt production, monosodium glutamate manufacturing, milk processing, fermentation, as well as in some light industry and defense sectors. It adopts structures such as multiple nozzles and vapor rings (guide discs), as well as multi-stage pump feeding with a low installation height; only 4.5 meters of installation height is required. This improves its operational performance, giving it a certain degree of advancement and representing an innovation in vacuum condensation equipment. A steam ejector is a device that uses steam as power to meet engineering requirements. It does not require electricity, has no moving or rotating parts, features a simple design, and operates reliably, which is why it is widely used. 1. Working principle: The steam ejector converts the potential energy of high-pressure steam into high-speed kinetic energy through the nozzle; this drives in low-pressure steam, enabling thorough mixing within the ejector’s mixing section. As a result, the velocity of the steam decreases while its pressure increases, meeting the requirements of production processes. II. Structural Introduction: The structure of the injector consists of two main parts: 1. Nozzle: High-pressure steam forms a high-speed jet through the nozzle. The shape and size of the nozzle are determined based on the properties of the steam (superheated steam or saturated steam) as well as the pressure drop across the nozzle; the pressure drop across the nozzle should be 45.5% or more of the initial pressure for superheated steam. The saturated vapor is over 42.3% of the initial pressure. The nozzle is designed as a Laval nozzle; otherwise, it is conical in shape. The material used is 1Cr18Ni9Ti. 2. Injector mixing section: High-pressure and low-pressure steam enter this tube first, where they are mixed evenly before the pressure increases and the velocity decreases. Therefore, the mixing section consists of three parts: front, middle, and rear, each with a different function. With different shapes, their dimensions (diameter and length) are determined based on the total flow rate, in order to ultimately produce steam at the desired pressure. The component that connects the two is called a steam chamber, which keeps the two parts at a proper distance and provides a certain amount of space. The material commonly used for steam ejectors is high-quality carbon steel grade 20#. 3. Scope of application: 1. Steam jet supercharger: High-temperature and high-pressure steam with high energy is ejected at high speed through nozzles to draw in low-pressure steam, thereby mixing them to produce (medium-pressure) steam at the temperature and pressure required for industrial processes. This is a more energy-efficient approach to meeting process requirements (compared to temperature-reducing pressure regulators), and it is also more convenient. A device called a secondary steam recycler also falls into this category. 2. Steam jet water heater: It uses a steam jet to draw in a certain amount of cold water, heat it to the desired temperature, and deliver it to where it is needed; it can be used for heating and domestic water use. 3. Steam jet vacuum pump: It removes the air from within the container using a steam jet, thereby creating a certain level of vacuum in the container. Such as the turbine shaft seal extractor, which prevents steam from leaking out of the turbine and recovers heat and working fluid. Another example is using vacuum creation in the suction section of a large circulating water pump to draw in water from a lower level.

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