What is the steam pressure at the ejector nozzle?
For ejectors discharging to the atmosphere, steam pressures below 60 psig at the ejector are generally uneconomical [8]. If the discharge pressure is lower as in multistage units, the steam-pressure at the inlet can be lower.
What is an ejector nozzle?
In design, the ejector nozzle features a convergent primary nozzle which is enclosed concentrically within a tube. The hot exhaust flow from the engine attains sonic velocity at the nozzle exit (M1=1), the highest Mach number possible with a convergent nozzle.
How steam jet 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 are the ejector main parts?
Figure 1 presents the main parts of an ejector including primary nozzle, secondary inlet, suction and mixing chambers, secondary throat, and exit diffuser.
How do you increase steam pressure?
You could heat the steam at constant volume, so the pressure will rise.
Which steam is used in ejector?
The steam or air converts that pressure or potential energy to velocity or kinetic energy. The jet of high-velocity steam or gas entrains the gas to be evacuated or pumped in the suction of the ejector.
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.
How do I increase my vacuum ejector?
How To Improve Ejector System Efficiency
- Combine ejector strengths with liquid ring vacuum pump strengths.
- Last stage jet and after-condenser are eliminated and replaced with a high-efficiency liquid ring vacuum pump.
- Interstage condenser pressure is optimized and cooling water load is typically reduced.
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 ejector mechanism?
An Ejector works by accelerating a high pressure stream (the ‘motive’) through a nozzle, converting the pressure energy into velocity. Around the nozzle tip, where velocity is highest, a low pressure region is created. This is often called the suction chamber of the Ejector.
How do I reduce steam loss?
Download Adobe Reader.
- Recover and use heat from industrial furnaces:
- Use heat cascading:
- Use proper heating methods:
- Use proper furnace insulation and maintenance techniques:
- Reduce flue gas oxygen content:
- Reduce steam demand:
- Use alternate fuel:
- Improve boiler efficiency:
How does steam jet ejector work?
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. The jet of high-velocity steam or gas entrains the gas to be evacuated or pumped in the suction of the ejector.
What does a venturi do in a jet pump?
The venturi changes the high-speed jet stream back to a high-pressure for delivery to the centrifugal pump. The jet and venturi are simple in appearance but they have to be well engineered and carefully matched to be efficient for various pumping conditions.
Why is a nozzle used in steam jet refrigeration system?
2. Why is a nozzle used in a steam jet refrigeration system? Explanation: Nozzle is a device which has one of its end converging whereas the other end diverging, when the steam enters from larger end and exit at smaller end, its velocity increases that produces Jet effect. Hence nozzle is used for it.
Which is nozzle used in a steam jet refrigeration system?
In this case, the primary nozzle, 3.8M4, is used to investigate. The boiler temperature is varied between 110°C and 120°C. During the test, the chilled water used for cooling the condenser is varied between 29 and 33°C.
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.