What is the function of air ejector in steam 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 the function of the ejector?
The ejector uses a converging nozzle to increase the fluid velocity to transform high static pressure into velocity pressure. This conversion of static pressure to velocity pressure results in a low pressure zone that provides the motive force to entrain a side fluid.
How steam ejector refrigeration system works?
Working fluid is heated at a high pressure and temperature in the generator. High-pressure refrigerant vapor enters the nozzle. Working fluid is then accelerated to a high velocity and entrains motive steam from the evaporator, resulting in a cooling effect.
How the air ejector maintain vacuum in the condenser?
Abstract. A condenser creates the lowest possible turbine back pressure by evacuating air from a condenser shell. A liquid ring vacuum pump and/or steam-jet air ejector is used to maintain vacuum in a condenser. Heat liberated from turbine exhaust steam is removed by either water or air, or a combination of these.
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.
Which pump is using in air jet?
The jet pump is a centrifugal pump with one or more impeller and diffuser with the addition of a jet ejector. A JET EJECTOR consists of a matched nozzle and venturi. The nozzle receives water at high pressure. As the water passes through the jet, water speed (velocity) is greatly increased, but the pressure drops.
What are the advantages of jet pump?
Advantages:
- no moving parts or mechanical parts that wear.
- Long run life.
- Capable of high production rates.
- Adjustable to varying production rates by adjusting the power fluid injection rate.
- Low maintenance costs and are easily and quickly retrieved and replaced when maintenance is required.
What is the principle of a steam jet refrigeration system explain with the help of a neat sketch the working of a steam jet refrigeration system?
Steam jet or Ejector refrigeration system uses water as refrigerant. It uses the basic principle of boiling of liquid at lower temperature by reducing pressure on its surface. This system employs a steam ejector or booster instead of mechanical compressor.
What are the advantages and limitations of steam jet refrigeration system?
Advantages of Steam Jet Refrigeration System
- Steam jet refrigeration system used where there is no electricity.
- This is mostly used where steam is highly available like..
- This is non-inflammable.
- This can be cooled directly without any high cooling systems.
- This has less maintenance.
- This has no vibrations.
What is motive fluid in ejector?
Very often, the motive fluid is steam and the device is called a “steam jet ejector.” Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge (Fig. 1). The two major functions of ejectors are as follows: Thermocompressors.
What is steam jet?
Steam jet ejectors are mass flow machines that are ideally suited for extracting and compressing noncondensable gas from a condenser operating at high vacuum. Compared with other mechanical compressors, steam jet ejectors offer the benefits of no moving parts and low cost.
What is a steam jet pump?
517 Steam Jet Vacuum Pump operates on the steam jet principle, utilizing the energy of steam to create vacuum and handle process gases. Steam under pressure enters at the nozzle and produces a high velocity jet. This jet action creates a vacuum that draws in and entrains the suction gas.
What is air jet pump?
Air jet vacuum pumps use atmospheric air as motive medium. Backed by a liquid ring vacuum pump which produces an intermediate vacuum of 50 to 100 mbar, the air jet vacuum pump can reach a suction pressure of 5 mbar, depending on design and operating conditions.
How a jet pump well works?
How Does a Jet Pump Work? For a jet pump to create suction and operate, its electric-powered impeller moves water through a narrow jet that is in front of the impeller, and this causes the water to move quickly. Ultimately, a vacuum is created and additional water is drawn up.
How efficient are jet pumps?
Jet pumps have the best overall total process efficiency, in Horse Power (HP) per barrel produced. Achieved through a combination of the Jet pump’s design increasing critical flow areas to increase efficiency dramatically and the 90% efficient Hydra-Cell power fluid pump.
How does steam jet cooling work?
Steam is passed through a vacuum ejector of high efficiency to exhaust a separate, closed vessel which forms part of a cooling water circuit. The partial vacuum in the vessel causes some of the water to evaporate, thus giving up heat through evaporative cooling.
What are the advantages of steam jet refrigeration system?
Compared with other type of systems, Steam jet refrigeration system has many advantages such as structural simplicity, high reliability, easy to maintain, low cost and can be used with water which is the most harmless refrigerant.
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 does steam air conditioning work?
How does steam produce air-conditioning? Large buildings use machines called chillers to provide the cooling effect. A chiller removes heat from a liquid (typically water). This chilled water is then used to cool and dehumidify the air.
What is a steam jet ejection?
Very simply, an ejector is a pumping device. It has no moving parts. Instead, it uses a fluid or gas as a motive force. Very often, the motive fluid is steam and the device is called a “steam jet ejector.” Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge (Fig. 1).
What are the parts of a steam ejector?
Ejector Design. Very simply, an ejector is a pumping device. It has no moving parts. Instead, it uses a fluid or gas as a motive force. Very often, the motive fluid is steam and the device is called a “steam jet ejector.” Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge (Fig.
What are the disadvantages of a steam ejector?
The main disadvantages of this ejector is the steam escaped to atmosphere and can’t reuse. This is also known as the running ejector which evacuate the air continuously at the system running condition. This is a multi stage type ejector .
What is the function of the ejector in an aircon?
The main function of the ejector is to extract air and no condensate gasses from a closed system . It removes air from the condenser and provide vacuum. The amount of air extracted at the time of starting is more as compared to running unit.