New PDF release: Combustion and Pollution Control in Heating Systems

By Victor Ian Hanby BSc, PhD, CEng, MInstE, MCIBSE (auth.)

ISBN-10: 144712071X

ISBN-13: 9781447120711

ISBN-10: 3540198490

ISBN-13: 9783540198499

Combustion is especially a lot an interdisciplinary subject, drawing jointly components of chemistry, fluid mechanics and warmth move. it really is an element in lots of undergraduate measure programmes, starting from a pivotal position in gas technology via to an element a part of classes in chemical, approach and development prone engineering. for plenty of scholars in these disciplines the place combustion in heating plant is a crucial a part of their reviews, there are frequently difficulties in coming to grips with the elemental ideas underlying the combustion of hydrocarbon fuels. specifically, the ideas of chemical and comparable thermodynamic alterations can end up tricky to assimilate. The medical literature facing combustion has a tendency to be particularly polarised, with a wealth of literature aimed toward the professional reader, yet at a uncomplicated point the basics of this crucial method are usually taken care of really tersely in textbooks on thermodynamics. the target of this booklet is to supply an creation to the elemental rules of the combustion of hydrocarbon fuels in heating plant for structures and business methods. In these chapters the place perform in challenge fixing could make a favorable contribution to knowing, a few numerical difficulties were incorporated. Acknowledging the ever-widening use of desktops in technical schooling, a few algorithms which are simply coded up for fixing numerical difficulties were integrated within the textual content. those can end up rather precious in, for instance, the calculation of yes fluid houses, both to be used in hand calculation or for incorporation into greater programs.

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Additional resources for Combustion and Pollution Control in Heating Systems

Example text

Should the enthalpy of combustion be required with water in the liquid phase, then the latent heat of evaporation for the water vapour produced in the combustion products (Hfg) must be accounted for: (AH25)f = (AH25)g - n x Hfg where n represents the number of kmoles of water produced per kmole of fuel. The latent heat at 25°C has a value of 44 000 kJ kmole- 1 of water produced. The numerical difference between the two cases is significant, as the following example will show. 1 The value of Ml2S for methane is -802 300 kJ kmole-!

Firstly, hydrogen is not a widely used fuel (it may have possibilities in powering vehicles). Secondly, writing the dissociation reaction as the reverse of the combustion reaction is a simplification as many more complex dissociation reactions occur. The dissociation of water itself occurs via two reactions instead of the single reaction considered in this example. The nitrogen and oxygen present may react to form oxides of nitrogen (this is important because of the emissions from plant although it has negligible effect on the flame temperature).

The results of these calculations are more correctly referred to as 'undissociated adiabatic flame temperatures', which acknowledges the simplifications inherent in them. In order to understand the more complete picture it is necessary to gain some insight into the principles of chemical equilibrium, which are introduced in the next chapter. 6 References 1. Mayhew YR. Rogers GFC (1984). Thermodynamic and Transport Properties of Fluids. Blackwell. Oxford 2. Spencer HM (1945). Empirical heat capacity equations.

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Combustion and Pollution Control in Heating Systems by Victor Ian Hanby BSc, PhD, CEng, MInstE, MCIBSE (auth.)


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