What is Hogger ejector?
Hogger Ejector :- This ejector is known as the starting ejector which is used to pull the gasses at the time of starting of system. It has high capacity of air extraction.
What is a Hogger system?
A hogger is a term someone somewhere thought would be a good description for a large air ejector that can be used to “bring up” (establish) vacuum on a condenser when little or no steam is being condensed, such as during start-up of a steam turbine.
How is a vacuum ejector created?
In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area. The fluid leaving the jet is flowing at a high velocity which due to Bernoulli’s principle results in it having low pressure, thus generating a vacuum.
How many types of ejector systems are there?
Ejectors are generally categorized into one of four basic types: single-stage, multi-stage non-condensing, multi-stage condensing and multi-stage with both condensing and non-condensing stages. Single-stage ejectors are the simplest and most commonly used construction.
Why steam is used in ejector?
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. The steam or air converts that pressure or potential energy to velocity or kinetic energy.
Which steam is used in ejector?
4. In the steam ejector system, the steam (auxiliary steam) is passed through a nozzle and allowed to expand in one chamber. When the HP steam passes through a nozzle it expands in the chamber and creates vacuum in the chamber; this chamber is connected to the condenser so that the condenser vacuum is created.
Why ejector is used in turbine?
The main function of the ejector is to maintain the vacuum value in the condensation system of the turbine. According to this, main indicators of the efficiency, which influence the vacuum value in the condenser (pressure of the I stage and the length of the performance curve) are also connected with the reliability.
What is hogging in vacuum?
The evacuation packages perform two distinct services namely hogging and holding. During startup, or hogging operation, the evacuation system removes air from the steam space of the condenser and steam turbine.
What is a venturi pump?
A Venturi System reduces pressure when a fluid flows through a constricted section (or choke) of a pipe. A Venturi vacuum is created by a pump with compressed air running through it, yet the pump has no moving parts.
What is a venturi eductor?
A venturi eductor is the section of a pneumatic conveying system that transports a given product (powders, pellets and granular bulk solids) over a fixed distance and height. These devices use the venturi principle to entrain low pressure air with a high pressure air stream.
Is ejector a compressor?
An ejector refrigeration system can be considered as a modification of a conventional vapor compression cycle (VCC). An ejector takes the place of a compressor to pressurize the refrigerant vapor flowing from an evaporator and discharge it to a condenser.
What is difference between ejector and eductor?
1. The eductors are used to remove the air 4 times the volume of the vessel per hour for the vessel entry jobs. whereas the ejectors just suck the excess volume of the system and maintains the system pressure accurately. The difference is with respect to their function and not with respect with their motive fluid.