Combustion and Incineration Processes: Applications in by Walter R. Niessen

By Walter R. Niessen

Protecting every one point of an incineration facility, from contaminant receipt and garage to stack discharge and dispersion, this reference explores the operation and assessment of incineration structures for detrimental and non-hazardous gaseous, liquid, sludge, and sturdy wastes. Highlighting breakthroughs in pollution keep an eye on, the e-book discusses advances in fabrics dealing with, waste processing, refractory and fabrics engineering, combustion know-how, and effort restoration to lessen and keep an eye on pollutants and toxins within the surroundings. It encompasses a disk containing spreadsheets for functional analyses of waste features and combustion structures.

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Extra resources for Combustion and Incineration Processes: Applications in Environmental Engineering, Third Edition (Environmental Science & Pollution)

Sample text

Depending on temperature, inorganic (carbonate or bicarbonate) carbon may be released as CO2 by dissociation or may remain in the ash. Elemental or organic hydrogen þ O2 ! H2 O (but see chlorine, below). Depending on temperature, hydrogen appearing in water of hydration may or may not be released. , 2NaOH ! Na2 O þ H2 OÞ. Oxygen associated with the nonmetallic elements C, H, P, S, or N in organic compounds or with metals is assumed to behave as O2 in air viz. reacting to form oxides (or remaining as the oxide).

Taking limestone decomposition as an example, at any instant of time some molecules of calcium carbonate are breaking apart, releasing gaseous CO2 . Also, however, CO2 from the environment is reacting with calcium oxide in the solid matrix to reform the calcium carbonate. The equilibrium partial pressure of CO2 over the solid and the decomposition rate are functions of temperature. As the temperature increases, the partial pressure of CO2 increases. The approximate decomposition temperatures in Table 5 correspond to a partial pressure of 1 atm of the pertinent gaseous product.

An ash analysis is another special analysis. The ash analysis reports the content of the mineral residue as the oxides of the principal ash cations. A typical ash analysis is reported as the percent (dry basis) of SiO2 , Al2 O3 , TiO2 , Fe2 O3 , CaO, MgO, P2 O5 , Na2 O, and K2 O. As discussed in the Refractories section of Chapter 5, the balance between the acidic and basic oxides in the ash is important in setting ash melting temperatures and in influencing corrosive attack of refractory (fluxing).

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