Stability limits and combustion measurements in low calorific value gas flames.
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Stability limits and combustion measurements in low calorific value gas flames. by Rooktabir Nandan Sauba

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Published by [Middlesex Polytechnic] in [London] .
Written in English


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Edition Notes

Thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy, Middlesex Polytechnic, London, 1987.

ID Numbers
Open LibraryOL13715848M

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Addition of swirl up to a limit of O~ 69 generally improved stability. Preheating secondary air alone was beneficial only if the temperature was raised to at least oC. A combination of intermediate swirl and moderate preheat of the secondary air resulted in satisfactory flame stability over a wide range of calorific values of the : Rooktabir Nandan Sauba. STABILITY LIMITS AND COMBUSTION MEASUREMENTS IN LOW CALORIFIC VALUE GAS FLAMES by Rooktabir Nandan SAUBA Thesis submitted to the Council for National Academic Awards in partial fulfilment of the requirements for the degree of Doctor of Philosophy. The work was carried out at the Energy Centre. Porous media combustion (PMC) has developed rapidly in the last few decades owing to its lower emissions and advantages over traditional combustion, such as the combustion of low calorific fuel gas (LCFG), higher burning rates, higher power intensity, and low emissions [,, ]. Its advantages have been driving researchers to study various combustion modes in porous by: 3. The article describes an experimental study and comparison of the combustion behavior and determines the stability map of turbulent premixed H 2-enriched oxy-methane flames in a model gas turbine stability limits, in terms of flashback and blow-out limits, are recorded over a range of hydrogen fraction (HF) at a fixed oxygen fraction (OF) of 30% and a particular inlet bulk.

The combustion stability (extinction) limits and nitrogen oxide (NO x) emissions of nonpremixed ammonia (NH 3)–hydrogen (H 2)–air flames at normal temperature and pressure are studied to evaluate the potential of partial NH 3 substitution for improving the safety of H 2 use and to provide a database for the nonpremixed NH 3-substituted H 2 –air flames. 1. FUELS AND COMBUSTION Bureau of Energy Efficiency 1 Syllabus Introduction to Fuels, Properties of Fuel oil, Coal and Gas, Storage, handling and Calorific Value The calorific value is the measurement of heat or energy produced, and is measured either as is handled hot and maximum limit of 1% is specified in the standard. 5 The Combustion Process Combustion is a chemical reaction of rapid oxidation started by the correct mixture of fuel, oxygen and an ignition source. The chemical reaction for natural gas is: CH4 + 3O2 = Heat + 2H2O + CO2 + O2 Where: CH4 = 1 cubic foot of Methane Gas (Natural gas) 3O2 = 3 cubic feet of Oxygen Heat = BTU's of energy produced from the chemical reaction. 64 Combustion Fundamentals Chap. 2 The large quantity of nitrogen diluent substantially reduces the mole fractions of the combustion products from the values they would have in its absence. Example Combustion ofOctane in Air Detennine the stoichiometric fuel/air mass ratio and product gas composition for combus­ tion ofoctane (CSH1S) in air.

That is, for a specific gas, values in $\pu{J/mol}$ and $\pu{J/kg}$ will be mainly independent of the pressure/temperature of the gas in combustion, while value in $\pu{J/m^3}$ will be strongly dependent due to the relation between volume, pressure and mass. It has also very low calorific value corresponding to one-tenth the one of methane. These characteristics lead to very low laminar burning velocities S L, as obtained from simulation of a mono-dimensional stationary and stabilized laminar premixed flame at K and atmospheric pressure, using the COSILAB® software. The study provides vital new results that will pave the way for clean combustion of low calorific fuel gas in porous media. Influence of preheated air temperature on flame propagation velocity. (Credit: Energy, , (). Recently, an experimental study of the structure and stabilization of low calorific value gas for the combustion of a partially premixed flame stabilized by conically nozzle flames was carried out.