900 Market Street, Meadville, Pa. 16335 U.S.A.

Combustion Software

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PH 814-724-4615

Above sequence depicts typical screen displays. The sequence cycles every 5 seconds.


   Combustion efficiency of any fuel. Equivalent quantities of gas, oil & coal fuels for any amount of heat energy. Volume, heat content & flue duct sizes of exhaust mixture products of combustion. Equivalent pipe lengths of combustion system components. Steam boiler efficiency and heat balance. Finned and non-finned heat exchanger sizing. Pressure drop and heat loss for insulated and non-insulated exhaust stacks.

   The COMBUSTION SOFTWARE SYSTEM consists of these programs:

Compute combustion efficiency at any flue gas temperature up to 3200F for any fuel (14 gaseous fuels, 5 fuel oils, & 2 coals are programmed) at any preheat air temperature and any amount of excess combustion air and up to 4% unburned fuel in the products of combustion. Equivalent quantities of 8 gaseous fuels, 5 fuel oils, coal (any fuel can have any combustion efficiency), and electric, for any amount of heat energy input in one of 13 units of measure from btu to dyne-cm to therm. Equivalent lengths of regulators, valves, mixers, pipe fittings, etc.
Compute products of combustion constituents, and HHV and LHV of gaseous fuels at any air:gas ratio. Determine correct air:gas ratios for any gas combustion process. Combustion equations show mol volumes of each constituent for complete combustion and complete reaction ratios.
This program is used to compute heat balances for fuel fired steam boilers. It is useful for plant and combustion engineers and management personnel who need accurate data on boiler heat losses, efficiency, and products of combustion constituents. The analysis is based on the total heat input to the boiler, using the higher heating value of the fuel, and evaluating the combustion losses and boiler setting parameters to account for all heat losses, to determine the overall boiler efficiency.
Any solid, liquid or gaseous fuel can be evaluated. Liquid fuels can contain any amount of carbon, hydrogen, sulphur, oxygen, nitrogen, moisture, and ash constituents. Gaseous fuels can contain any hydrocarbon, hydrogen, carbon monoxide, oxygen, nitrogen, carbon dioxide, sulphur dioxide, and sulphur constituents. 11 common hydrocarbon gases are programmed (from methane CH4 to octane C8H18). Any other CxHx hydrocarbon constituent can be entered.
Changes can be readily made after a run is completed. Changes in the quantity of excess combustion air, fuel constituents, flue gas temperature, heat input, etc., can be instantly evaluated. You can quickly see that a 40 degF rise in combustion air temperature will improve the boiler efficiency by approximately 1%.
This is a comprehensive stand-alone menu-driven program for preliminary estimating shell and tube, and crossflow duct heat exchangers based on thermal design criteria. Six flow arrangements are programmed; counterflow; parallel flow; 1 shell pass, two or more passes; steam or vapor condensers; refrigerant evaporators/coolers and crossflow tube banks in a duct. Select from 59 programmed fluids including 13 gases, steam, water, acetic acid, 3 alcohols, ammonia, aniline, benzene, 2 brine solutions, any concentration of glycol/water, 11 heat transfer fluids, 12 oils, 10 refrigerants, and toluene. Seventeen tube materials are programmed. Other fluids and pipe materials can be entered.
This program computes exhaust stack systems for the following requirements:
     1...Exhaust products forced draft stack systems
     2...Exhaust products natural draft systems
     3...Steam vessel exhaust
     4...Drying oven exhaust - dilute with air to 25% of the LEL
     5...Hot horizontal surface exhaust
     The program will compute the friction pressure drop of the exhaust products in unlined as well as insulated stacks, after entering all data such as stack length, quantity of 45 and 90 degree els, elbow radius, weather cap location above top of stack, etc. Any amount of dilution air can be added to hot exhaust products, to reduce the mixture temperature to a desirable level.
Compute the total volume of a mixture of flue gas products diluted with room air, and the resulting mixture, given the exhaust gas temperature and the gross btu/hr input. The mixture volume duct size is also computed for steel or refractory duct construction for any given pressure drop. The dilution air inlet orifice size is also computed for any pressure drop across the orifice using flange or vena contracta taps.

    For more information on all my programs a brochure containing descriptions and printouts is available. BROCHURE FORM


   Click on the links beside the animation at the top of the page for information on each program.

Web pages by....LdL Enterprise

For comments or corrections to these pages please contact  "jB"

©J.D.Barnes 2005-5-5