El Shorouk Academy The Higher Institute of Engineering
- Slides: 11
El – Shorouk Academy The Higher Institute of Engineering Chemical Engineering Department Fundamentals of Industrial Chemistry BY: Prof. Dr. Hossam Ibrahim El dossoky
- Heat Of Combustion Heat of combustion of a compound equal the summation of heat of combustion of its constituents minus heat of formation of the compound form its constituents. - Calorific Value Of a Fuel. • It is amount of heat result on complete oxidation of one gm of a fuel Heat of Combustion = Molecular Weight
Calculation of heat of Combustion ﺍﻟﺤﺴﺎﺏ ﺍﻟﻜﻴﻤﻴﺎﺋﻰ ﻓﻰ ﻋﻤﻠﻴﺎﺕ ﺍﺣﺘﺮﺍﻕ ﺍﻟﻮﻗﻮﺩ )ﺣﺴﺎﺏ ﻭﺯﻥ ﺃﻮ ﺣﺠﻢ ﺍﻟﻬﻮﺍﺀ ﺍﻟﻼﺯﻡ ﻟﺤﺮﻕ ( ﺍﻟﻮﻗﻮﺩ Air is the Source of oxygen required for the oxidation Excess air : The amount of air supplied above that theoretically necessary for complete oxidation of the combustible materials in the fuel. Percent Total Air-Theoretically air * (100) = Theoretically air excess air Note: The oxygen present in fuel “Calculated” ﻟﻠﺤﺮﻕ ﺍﻟﻼﺯﻡ ﺍﻷﻜﺴﺠﻴﻦ ﻛﻤﻴﺔ ﻣﻦ ﻳﻄﺮﺡ
• Vol. of O 2 required = 150 + 50 = 200 cu. ft. • Vol. of air required = 200 * 5 = 1000 cu. ft. • Vol. of gases = 300 + 100 + 600 + 800 = 1800 cu. ft. . ﺍﻻﺯﻡ ﺍﻟﻬﻮﺍﺀ ﻋﻦ ﺯﻳﺎﺩﺓ %20 ﺍﺳﺘﺨﺪﺍﻡ ﺣﺎﻟﺔ ﻓﻰ § Vol. of air with 20% excess = 1000 * § Vol. of N 2 required = 1200 * § Vol. of excess O 2 = 200 * = 1200 cu. ft. = 960 cu. ft. = 40 cu. ft. ⁻ Vol. of exhaust gases = 300 + 100 + 600 + 960 + 40 = 2000 cu. ft. ⁻ Vol. of N 2 in exhaust gasses = 600 + 960 = 1560 cu. ft.
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