We are using a fuel gas fired heater with 8 burners and an fd fan.
How do we increase the heat transfer of radiant zone?
it is currently 60% and we wish to take it to 75%.
Answers
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01/08/2018
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Ashutosh Garg, Furnace Improvements Inc, agarg@heatflux.com
If you want to increase the radiant section efficiency from 60% to 75%, you will need to expand the radiant section to lower the flux. Air preheating can increase the radiant efficiency by 7-8%.
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01/08/2018
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Sudhakara Babu Marpudi, Dangote Oil Refinery Company, m_sudhakarababu@yahoo.com
Optimising the Air registers, prevention of fugitive air leaks into the furnace (sealing all other leak sources) ensures adequate supply of Oxygen to the burners in the radiant zone. Unburnt gases that may find oxygen at the furnace arch level (in lieu of the pressure drop offered by the convection zone and leaks thru the peep doors left open after inspection) will burn in the arch section shifting the heat release from radiation zone to arch section. Fuel gases with higher Olefins tend to coke up the Fuel gas raisers leading to the failure of riser tips. Risers with lost tips will make the flames extra long and shift the burning from radiation zone to arch area. Maintaining excess Oxygen level in the flue gas in the range of 0.8 - 1.2% will improve the energy efficiency. Installation of Air Preheater is the best but a bit expensive option.
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31/07/2018
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
Adding air preheat would increase the flame temperature and increase the radiant duty. Deramic coatings on the tubes can also increase radiant tube heat transfer. The downside to this option is that the increased radiant duty cools down the flue gases, which reduces the energy recovery in the convection section. The net effect is that ceramic coatings don't necessarily increase heat transfer, rather they can just end up shifting where the heat transfer occurs in the heater.
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31/07/2018
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Bruce Carr, Suncor Inc, matukaze1@hotmail.com
It would depend on the types of burners you are using... LoNox? The trick to maximum efficiency is a long stable flame.... If your burners have primary, secondary and tertiary louvers make sure the primary and secondary are well trimmed letting the tertiary doors do the final adjustments..... put a teaspoon of baking soda into an observation port to see the true flame shape to make sure you are not after burning..... (if you've never tried it you will be amazed at what it can show you.... )
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