Velox boiler - high pressure boliers
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The Velox boiler operates on the principle that heat transfer rate increases when gas velocity exceeds the speed of sound. This allows the Velox boiler to generate steam at a higher rate without increasing the boiler size. The Velox boiler works as a basic heat exchanger, where compressed air from a gas turbine passes through combustion chambers and fire tubes at supersonic speeds, transferring heat to water circulating at high speeds in evaporator tubes. The high-speed water circulation results in efficient heat transfer and mixing of water and steam, which is then separated before the steam is superheated and used for power generation. The flue gases also pass through superheater tubes before rotating the gas turbine and transferring remaining heat in an economizer.
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- 1. POWERPLANT ENGINEERING (2171910) Prepared By : Sajan Gohel (160123119010) Branch: - Mechanical Batch: - 7D1 Guided by: Prof.:- Nirav Joshi Gandhinagar Institute of Technology VELOX BOILER
- 2. PRINCIPLE OF VELOX BOILER • When the velocity of the gas is greater than the speed of sound, its heat transfer rate is also increases. So more heat is transfer from gas to water as compare when the heat transfer at the subsonic speed. This is the basic principle of of it. This boiler can increase the heat transfer rate or can say steam generation rate without increasing boiler size. This is why; Velox boiler is most successful boiler in the gas turbine industries. P.P.E (2171910) VELOX BOILER 2
- 3. CONSTRUCTION OF VELOX BOILER Feed pump Economiser Gas turbine Axial compressor Tube evaporating section Water circulation pump Steam seperator P.P.E (2171910) VELOX BOILER 3
- 4. Working of velox boiler • The Velox boiler works as a basic heat exchanger. The working of this boiler is as follow. • The air is compressed by air compressor driven by gas a turbine driven. This compressed air passes from the combustion chamber, where more heat release by the fuel which increase the velocity of the flue gases up to sound velocity. From the bottom of combustion chamber, this flue gases pass from the fire tubes. These fire tubes surrounded by the evaporator water tubes. • The water from the economizer passes from the evaporator tube force by a circulating pump. This water passes 15 - 20 time from the evaporator tube at very high speed. Due to this high speed circulation, heat is transfer from the gases to the water at very high rate. The mixture of water and steam is formed which further passes from the water and steam separator. P.P.E (2171910) VELOX BOILER 4
- 5. • The steam from the steam separator passes to the super heater and further for process work. The remaining water in the steam separator again passes from the evaporator tube. The flue gases from the fire tubes send to the super heater tubes, where it increases the steam temperature. The gas from the super heater sends to the turbine where it rotates the gas turbine and then passes from the economizer. • This is the working of Velox boiler. P.P.E (2171910) VELOX BOILER 5