For startup purposes, when large volumes of air must be removed, a high capacity steam ejector called a hogging ejector is used. This high capacity ejector can evacuate the condenser and turbine unit to normal vacuum in something like 45 minutes. The hogging ejector uses large quantities of steam.

What is the purpose of a hogging ejector?

For startup purposes, when large volumes of air must be removed, a high capacity steam ejector called a hogging ejector is used. This high capacity ejector can evacuate the condenser and turbine unit to normal vacuum in something like 45 minutes. The hogging ejector uses large quantities of steam.

What is Hogger in steam turbine?

Hogger is a High capacity Thermocompressor pump to pull fluid out of the Steam Turbine’s exhaust circuit initially and maintain pressure according to Turbine’s design (usually less than 1atm in Condensing Turbine). Fluid pulled out of Condensing System may be vented out to atmosphere for continuous operation of hogger.

What is ejector in steam turbine?

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.

What is hogging and sagging moment?

The bending moment which causes a beam to bend with the concave side upwards, is called a Sagging Bending Moment. This kind of bending moment is treated as a positive bending moment. On the other hand, the bending moment which causes a beam to bend with the concave side upwards is called a Hogging Bending Moment.

What is the principle of ejector?

An ejector is based upon Bernoulli’s Principle which states: ‘When the speed of a fluid increases its pressure decreases and vice versa’. The ejector uses a converging nozzle to increase the fluid velocity to transform high static pressure into velocity pressure.

How does ejector create vacuum?

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 steam ejector creates vacuum?

The steam nozzle discharges a high-velocity jet across the suction chamber. This steam jet creates a vacuum which extracts air or gas from the adjoining vessel. As these gases are entrained in the steam, the mixture travels through the ejector into a venturi- shaped diffuser.

What is ejector system?

Ejector systems tie together multiple wells with a single pumping station and are typically used where the groundwater must be lowered more than 5 m, often in soil with low permeability. For these situations, they can be used at close spacing.

What is engineering hogging?

In solid mechanics, structural engineering, and shipbuilding, hogging and sagging describe the shape that a beam or similar long object will deform into when loading is applied. Hogging describes a beam that curves upwards in the middle, and sagging describes a beam that curves downwards.

Why is it called hogging moment?

This kind of bending moment is treated as a positive bending moment. On the other hand, the bending moment which causes a beam to bend with the concave side upwards is called a Hogging Bending Moment. This kind of a bending moment is treated as a negative bending moment.

What is ejector capacity?

The capacity (#/Hr.) of an ejector handling other than saturated vapor is a function of the fluids molecular weight and temperature. The higher the molecular weight of a fluid, the greater the ejector suction capacity, assuming equal motivating quantities.

How do I increase my vacuum ejector?

To generate higher vacuum, multiple stages are used; in a two-stage steam ejector, for example, the second stage provides vacuum for the waste steam output by the first stage. Condensers are typically used between stages to significantly reduce the load on the later stages.

What is diffuser in ejector?

The venturi shape towards the discharge end is the diffuser, which slows the mixture down and thereby increases its pressure. This enables the ejector to discharge at a pressure that is greater than that of the low suction branch.

What are the ejector main parts?

Recommended Spare Parts: Cast-iron ejectors have four basic parts: steam chest, nozzle, suction head and diffuser. in a fabricated-steel ejector these parts are combined into three: nozzle, mixing chamber and venturi throat.

What causes hogging moment?

The moment that makes beam to concave downward is called Hogging moment. It is taken as negative moment. The upward point is under tension and below point is at tension. There is line along axial direction which is under neither compression nor tension.