Skip to main content
SpringerLink
Log in

Exergy analysis of thermal processes in the building materials industry

  • Published:
Theoretical Foundations of Chemical Engineering Aims and scope Submit manuscript

Abstract

A method is proposed to calculate the chemical exergy with allowance for the chemical composition and the ambient temperature. The exergy analysis of cement clinker burning is performed. It is found that the maximal energy saving for a rotary cement kiln can be achieved by decreasing the sludge humidity and optimizing the fuel combustion and the clinker cooler operation. The analysis of thermal processes in terms of exergy characteristics is demonstrated to be more efficient than that in terms of thermal parameters, since the optimization and intensification of industrial kilns requires not only heat loss reduction but also more efficient use of heat.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

A, B, C:

chemical elements in the composition of a chemical compound

a, b, c :

stoichiometric coefficients of the elements A, B, and C, respectively

a 0, a 1, a 2 :

coefficients of equations for the chemical exergies of elements or compounds

c p :

true molar specific heat at constant pressure, kJ/(mol K)

e:

thermomechanical exergy of a substance in a flow, kJ/mol

e A, e B, e C :

molar exergies of the chemical elements A, B, and C, respectively, kJ/mol

e ch :

chemical exergy of elements or compounds, kJ/kg

e ep :

exergy of the electric power, kJ/kg

e f :

exergy of the fuel, kJ/mol

e in :

exergy of the inlet flows, kJ/kg

ek :

chemical exergy of the kth element, kJ/kg

e np :

exergy of the non-power-generating raw material fed to the kiln, kJ/kg

e out :

exergy of the outlet flows, kJ/kg

e p :

useful exergy of the product, kJ/mol

e r :

molar reaction exergy of compounds, kJ/mol

G f :

equivalent fuel consumption per ton of clinker, kg

H, H 0 :

enthalpies at the temperatures T and T 0, respectively, kJ/mol

K:

optimization criterion

m ik :

stoichiometric coefficient of the kth element in the ith substance (in the absence of the element, m ik = 0)

N:

number of chemical elements or reference substances

p i :

nonnegative weighting coefficient for the ith compound

p 0 :

ambient pressure, Pa

R:

number of compounds in a database

S, S 0 :

entropies at the temperatures T and T 0, respectively, kJ/(mol K)

t:

temperature, °C

T:

temperature, K

t 0 :

ambient temperature, °C

T 0 :

ambient temperature, K

x i :

concentration of the ith substance in the atmosphere

Δe :

exergy loss, kJ/kg

ΔG :

Gibbs energy of a chemical compound, kJ/mol

ΔG i :

Gibbs energy of the ith reference substance at a given ambient temperature, kJ/mol

ΔS :

entropy change, kJ/(kg K)

ηe :

exergy efficiency characterizing the exergy loss

ηh :

thermal efficiency

ηk :

exergy efficiency of kilns

ηt :

technological efficiency

References

  1. Szargut, J. and Petela, R., Egzergia, Warszawa: Wysdawnictwa Naukowo-Techniczne, 1965. Translated under the title Eksergiya, Moscow: Energiya, 1968.

    Google Scholar 

  2. Brodyanskii, V.M., Fratsher, V.K., and Mikhalek, K., Eksergeticheskii metod i ego primenenie (Exergy Method and Its Application), Moscow: Energoatomizdat, 1988.

    Google Scholar 

  3. Sazhin, B.S., Bulekov, A.P., and Sazhin, V.B., Eksergeticheskii analiz raboty promyshlennykh ustanovok (Exergy Analysis of Operation of Industrial Plants), Moscow: Kosygin Mosk. Gos. Tekstil. Univ., 2000.

    Google Scholar 

  4. Kafarov, V.V., Printsipy sozdaniya bezotkhodnykh khimicheskikh proizvodstv (Principles of Engineering of Wasteless Industrial Chemical Processes), Moscow: Khimiya, 1982.

    Google Scholar 

  5. Brodyanskii, V.M., Verkhivner, G.P., Karchev, Ya.Ya., et al., Eksergeticheskie raschety tekhnicheskikh sistem (Exergy Calculations of Technical System), Kiev: Naukova Dumka, 1991.

    Google Scholar 

  6. Besedin, P.V. and Trubaev, P.A., Thermodynamic Database for Analyzing the Processes of Production of Silicate Building Materials: Part 1, Vestn. Belgorod. Gos. Tekhnol. Univ., 2003, no. 5, pp. 229–233.

  7. Kireev, V.A., Metody prakticheskikh raschetov v termodinamike khimicheskikh reaktsii (Methods of Applied Calculations in Thermodynamics of Chemical Reactions), Moscow: Khimiya, 1975.

    Google Scholar 

  8. Trubaev, P.A. and Per’kov, S.A., Intensification of Clinker Burning by Introducing Technogenic Products into the Kiln, Sb. dokl. Mezhdunar. nauchno-praktich. konf. “Sovremennye tekhnologii v promyshlennosti stroitel’nykh materialov i stroiindustrii” (Proc. Int. Scientific and Practical Conf. on Modern Belgo Technologies in the Building Materials Industry and the Construction Industry), Belgorod: Shukhov Belgorod Gos. Tekhnol. Univ., 2003, part 1, pp. 111–115.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Shukhov Belgorod State Technological University, ul. Kostyukova 46, Belgorod, 308012, Russia

    P. A. Trubaev

Authors
  1. P. A. Trubaev
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Original Russian Text © P.A. Trubaev, 2006, published in Teoreticheskie Osnovy Khimicheskoi Tekhnologii, 2006, Vol. 40, No. 2, pp. 191–198.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Trubaev, P.A. Exergy analysis of thermal processes in the building materials industry. Theor Found Chem Eng 40, 175–182 (2006). https://doi.org/10.1134/S0040579506020102

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0040579506020102

Keywords

Search

Navigation