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As different gases have different compositions, no single gas can carry out the work of other gas. The same thing goes with their systems. A single system designed for Propane or any other natural gas cannot work with Butane. Gas Combustion Unit is a safe system design reckoned in the market for its performance and efficacy. It is designed to remove this problem. It is developed using thin perforated sheet to support the burner. There is always equal distribution of premix takes place as it is completely welded with diverters. The housing is available with or without collar according to the need.
Features of Gas Combustion :
Generally, CO2 and H2O are formed as by products of combustion of hydrocarbons. For example,
Construction of MFB Burner :
A thin perforated sheet supports the burner as the cloth does not have strength of its own. There is equal distribution of premix as it is fully welded with diverters inside and the housing is made up of SS304. The housing comes with or without collar. The gas can be made to enter from the back or its side. The height will increase in case of side entry of the gas. MFB Cloth 100 is used for blue applications for its low density - 1.5 KG/m2.
* This is formaldehyde. If the mixture hits cold wall, the process stops here. This is why formaldehyde smell is observed in poor heat exchanger designs.
Gas / air ratios
Radiant/ Blue flame modes
With premix flow leading to heat intensity in the range of 100- 500KW/m2, most of the combustion takes place within the surface of the burner itself. This makes the surface heat, glow and transfer the heat in radiant form. This is infrared mode. Here the surface temperature is highest at 1050 C. If premix quantity is increased, the burner actually cools down because of excess nitrogen flow. Combustion takes place outside the burner. This is blue flame mode. Here the heat transfer is in convection mode. Intensities as high as 20 MW/m2 are possible. In both the cases flue gases are released in the air. For radiant operation, ? = 1.05 to 1.1 For blue flame mode, ? = 1.1 to 1.2
Efficiencies in Radiant mode
At lower intensities higher amount of combustion takes place within the surface. At around 125KW/m2 the radiant efficiency is highest at approx. 55-60%. Below 100KW/m2 the flame cannot be sustained. Efficiency is high in face down position. It can be increased in any position by adding a grid in front.
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