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A Velox boiler is a type of high pressure, forced circulation, water tube boiler.
It was developed in the 1930s by Brown Boveri company of Switzerland. The first public demonstration of Velox was at VDI scientific conference in Berlin in October 1932.
Volex boiler is based on the principle of, when the velocity of gas becomes more than the velocity of sound, the transmission of heat by gas becomes much higher as compared to heat transmission of heat at sub-sonic speed, ie, lower than the speed of sound. In a Velox boiler velocity of the gas is higher than the velocity of sound.
In this boiler heat transfer rate or steam generation rate can be increased without increasing the size of the boiler.
It can be increased by simply increasing the speed of gas.
Velox Boiler consists of several parts–
- Feed pump
- Water circulation Pump
- Combustion chamber
- Gas turbine
- Axial Compressor
- Steam Separator
- Super Heater
The feed pump supplies water inside the boiler. Then, this water goes to the economiser where this device preheats the water with the help of combustion chamber heat.
The water circulation pump helps to circulate the water into the entire boiler, Where the combustion chamber helps to provide needed heat by burning fuel.
The axial compressor is used to compress and pressurize steam and the steam separator sends the dry steam to the superheater and non-steam liquid back.
A superheater is used to superheat the steam and send it to a gas turbine where the energy of high-pressure steam will be converted into mechanical energy or generate electricity.
Velox boiler diagram-
Related Article- Schmidt-Hartmann Boiler
- At first, water is fed to the economiser from the feed pump.
- The economiser heats the water but does not heat up to the boiling point.
- Then the warm water from the economiser is passed to the water circulating pump.
- Then the water enters the tube evaporating section which is inside the combustion chamber.
- On the other hand, a gas turbine drives an axial air compressor.
- A gas turbine converts gas into mechanical energy and with that mechanical energy axial air compressor is driven.
- In an axial air compressor, the air flows through the axis of rotation of the compressor.
- The compressed air by the air compressor enters the combustion chamber and passes from it.
- When this compressed air passes from the combustion chamber more heat is released by the fuel which increases the velocity of flue gases up to the sound velocity.
- Flue gases pass from the fire tubes near the bottom of the combustion chamber.
- These fire tubes are surrounded by evaporator water tubes. when the water enters the evaporating tube at high speed, the formation of gas happens at a very high rate due to the high speed of water and gas.
- After that mixture of water and steam is formed which is passed through a water and steam separator.
- This separator separates the steam from the water. The steam from the steam separator is passed to the superheater.
- The remaining water again passes from the evaporator tube and this process continues until the water is converted into steam.
- The flue gases from fire tubes are sent to the superheater for heating the steam.
- After that the flue gas from the superheater is sent to the gas turbine where it rotates the gas turbine and after that gas passes the economiser used to heat the water initially which is coming from the feed pump.
- This is how the Velox boiler works.
Here are some advantages of the Velox boiler-
- Velox Boiler is very compact and requires very little space as compared to other boilers.
- It can be started quickly and easily
- It has good flexibility
- It has high thermal efficiency of about 90-95%
- It has a high heat transfer rate.
- High Combustion rate
- Easy to use
Related Article- Top 35 Boiler Questions and Answers [With PDF]
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Here are some Frequently asked questions And MCQs, you should consider staying there for some time.
Forced type of water circulation found in Velox boiler.
The pressure of Velox boiler is 2.5 to 3 bar.
A. In the drum
B. In the fire tube
C. Above steam dome
D. Over the combustion chamber
Answer- D. Over the combustion chamber
A. Increase the steam pressure
B. Heat the fuel of low CV
C. Heat the air entering fire grate
D. Heat the feed water by waste gases
Answer- D. Heat the feed water by waste gases
A. Area of grate
B. Volume of furnace
C. Outer surface area of boiler
D. Surface area which is in contact with flue gases
Answer- D. Surface area which is in contact with flue gases
A. maximum temperature of steam
B. Heat transfer rate in kJ/hr
C. Steam output in kg/hr
D. Heating surface area
Answer- C. Steam output in kg/hr
A. Equivalent evaporation
B. Evaporative capacity
C. Boiler horsepower
D. Generation rate
Answer- A. Equivalent evaporation
A. Boiling rate
B. Boiler efficiency
C. Generating factor
D. Equivalent evaporation
Answer- B. Boiler efficiency
A. Cochran boiler
B. Locomotive boiler
C. Lancashire boiler
D. Babcock-Wilcox boiler
Answer- B. Locomotive boiler
A. Boiler efficiency
B. Equivalent efficiency
C. Capacity of boiler
D. None of these
Answer- C. Capacity of boiler
Abhishek Tiwary is a blogger by passion and a Quality Engineer by profession. He completed his B.Tech degree in the year 2017. Now working in a reputed firm. He loves to share his knowledge with others.