What Is Velox Boiler?
Velox boiler is a high-pressure water tube boiler. Again if there is a supply of heat through the tube and water supply around the tube, then these boilers can be a fire tube boiler.
The Velox boiler uses GAS in the combustion chamber. This boiler has a unique core principle compared to other boilers that we have already discussed.
When the velocity of the GAS exceeds the velocity of the sound, the heat transfer rate makes the GAS much higher than the rate obtained in the subduction current.
The Velox boiler took advantage of the principle. Applying this principle, the Velox boiler can increase the total heat transfer rate, meaning the steam generation rate, without actually increasing its size.
So we can say large amounts of heat will be transferred from GAS to water. For this particular reason, the Velox boiler is one of the best bowlers in the gas turbine industry. This boiler has thermal efficiencies of about 90 to 95 percent.
Construction of Velox Boiler:
The Velox boiler is a water tube forced circulation boiler. It has a gas turbine-driven air compressor, which compresses the air. This compressed air enters the vertical combustion chamber, resulting in higher rates of heat from the fuel, which increases the velocities of the flue gases to the sound velocity.
It is a force circulating boiler, so pumps are used to circulate water inside the boiler. This boiler also has water and a fire tube to maintain the flow of gas and water inside the boiler. This boiler has other essential mounting and accessories such as economizer, super-heater, blow-off valve, safety valve, etc.
Principle of Velox Boiler:
The Velox Boiler is based on the fact that when the velocity of the gas exceeds the velocity of sounds, the transmission of heat by the gas becomes much greater than the transmissions of heat at sub-sonic speed, i.e., lower than the speed of sounds.
In this boiler, the heat transfers rate or stream generation rate can be increased without increasing the size of the boiler. It can only be increased by increasing the speed of the gas.
Working of Velox Boiler:
First, feed the economist from the feed pump. The economizers heat the water but do not heat it up to the boiling point. The hot water is then transported from the economizer to the circulating pump of water. Then the water enters the tube evaporation section, which is inside the combustion chamber.
On the other hand, the gas turbines drive an axial air compressor. A gas turbine converts gas into mechanical energy and is driven with it by a mechanical energy axial air compressor. In axial air compressors, air flows through the axis of rotation of the compressor.
Compressed air by the air compressor enters the combustion chamber and passes through it. When this compressed air passes through the combustion chamber, more heat is released by the fuel, which increases the velocities of the flue gas to the velocity of sound.
Flue gas is a gas released from the atmosphere through a flue by a steam generator or furnace.
First, feed the economist from the feed pump. The economizers heat the water but do not heat it up to the boiling point. The hot water is then transported from the economizer to the circulating pump of water.
Then the water enters the tube evaporation section, which is inside the combustion chamber. The evaporator passes through the water 15 -20 times at high speed, forced by the water flow pump.
On the other hand, the gas turbine drives an axial air compressor. A gas turbine converts gas into mechanical energy and is driven with it by a mechanical energy axial air compressor. In axial air compressors, air flows through the axis of rotation of the compressor.
Compressed air by the air compressor enters the combustion chamber and passes through it. When this compressed air passes through the combustion chamber, more heat is released by the fuel, which increases the velocities of the flue gas to the velocity of sound.
Grip gas is a gas released from the atmosphere through a flue by a steam generator or furnace. Flue gases pass through the fire tubes near the bottom of the combustion gases. These fire tubes are surrounded by evaporated water tubes.
When water enters the evaporation tube at high speed, the heat of the gases is transferred at a very high rate due to the high speed of water and gas. A mixture of water and steam is then formed, which is passed through the water and steam separators. This separator separates the steam from water.
The steam from the steam separator is passed to the superheater and then passed to the process work. The remaining water again passes through the evaporator tube, and the process continues until the water is converted into steam.
The flue gases released from the fire tubes are sent to the superheater to heat the steam. After that, the flue gas from the superheater is sent to the gas turbine, where it rotates the gas turbine, and then the gas passes through the economizer that is initially used to heat the water that comes from the feed pump.
Advantages of Velox Boiler:
Here, the different advantages of Velox boiler are as follows
- 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.
Frequently asked questions (FAQs) about Velox boilers that could be included in the article:
What is a Velox boiler?
A Velox boiler is a high-pressure water tube boiler that utilizes a unique principle involving high gas velocities to achieve efficient heat transfer.
How does a Velox boiler work?
It works by using a gas turbine-driven air compressor to achieve high gas velocities in the combustion chamber. This accelerates heat transfer from the flue gases to the water tubes, increasing steam generation rates without increasing boiler size.
What are the key components of a Velox boiler?
Key components include a gas turbine-driven air compressor, water circulation pumps, economizer, superheater, fire tubes, and safety valves.
What are the advantages of a Velox boiler?
Velox boilers are compact, require less space compared to other boilers, start quickly, have high thermal efficiency (90-95%), and offer high heat transfer rates.
Where are Velox boilers commonly used?
They are often found in applications requiring high thermal efficiency and compact design, such as in gas turbine power plants and industrial processes requiring rapid steam generation.
How does the Velox boiler achieve high thermal efficiency?
By utilizing high gas velocities to enhance heat transfer, the Velox boiler efficiently converts heat from combustion into steam, minimizing energy losses and maximizing efficiency.
Are Velox boilers suitable for all industrial applications?
While highly efficient, Velox boilers are particularly suited for applications where space is limited, rapid steam generation is required, and high thermal efficiency is critical.
What are the limitations of Velox boilers?
Velox boilers may require careful maintenance due to their complex design involving gas turbines and high-speed heat transfer mechanisms. Additionally, they may not be suitable for all industrial processes due to specific operational requirements.
How do Velox boilers compare to other types of boilers?
Compared to traditional boilers, Velox boilers offer superior thermal efficiency and compactness but may require specialized maintenance and operational expertise due to their unique design and use of gas turbine technology.
What future developments are expected for Velox boiler technology?
Future advancements may focus on further enhancing efficiency, reducing maintenance requirements, and adapting the technology for broader industrial applications.
