Advertisement

High Temperature

, Volume 57, Issue 3, pp 348–354 | Cite as

Equations for Engineering Calculations of the Thermodynamic Properties of High-Temperature Dissociated Steam

  • R. Z. AminovEmail author
  • A. A. GudymEmail author
THERMOPHYSICAL PROPERTIES OF MATERIALS

Abstract

A system of equations is developed to calculate the properties of dissociated steam in the temperature and pressure ranges of 1250–3400 K and 0.01–10.00 MPa. These equations are based on detailed tables for dissociated steam compiled for a mixture of atoms of hydrogen and oxygen, hydroxyl OH, molecules of hydrogen and oxygen, and steam at a reference temperature of 0 K. Since the expansion of dissociated steam in a thermal engine results in its transformation into its common form, the equations for the parameters of dissociated or nondissociated steam uses the same reference temperature, i.e., the water triple point of  273.16 K. A system of equations for the calculation of dissociated-steam properties is derived with the generalized thermodynamic equation, which takes into account the change in the chemical potential and the composition of the mixture during steam dissociation, the Gibbs energy equation, differential thermodynamic equations, and equations for calculation the properties of nondissociated steam. To minimize the deviation of the steam properties calculated by the proposed equations from the table values, the considered temperature and pressure ranges have been divided into three regions. The deviation of the steam properties calculated by the proposed equations from the table values does not exceed 0.05–0.09%. The developed equations can be used in calculations of the processes of cooling of burners and combustion chambers during the combustion of hydrogen–oxygen mixtures, as well as cycles of heat engines that use high-temperature steam as a working fluid at temperatures over 1250 K.

Notes

FUNDING

The work was funded by the Russian Scientific Foundation, project no. 15-19-10027.

REFERENCES

  1. 1.
    Vargaftik, N.B., Spravochnik po teplofizicheskim svoistvam gazov i zhidkostei (Handbook of Thermophysical Properties of Gases and Liquids), Moscow: Nauka, 1972.Google Scholar
  2. 2.
    Kessel’man, P.M., Blank, Yu.I., and Mogilevskii, V.I., Teplofiz. Vys. Temp., 1968, vol. 6, no. 4, p. 658.Google Scholar
  3. 3.
    Termodinamicheskie svoistva individual’nykh veshchestv. Spravochnoe izdanie (Thermodynamic Properties of Individual Substances: A Handbook), Glushko, V.P., Ed., Moscow: Nauka, 1978, vol. 1, book 2.Google Scholar
  4. 4.
    Nigmatulin, R.I. and Bolotnova, R.Kh., High Temp., 2008, vol. 46, no. 3, p. 325.CrossRefGoogle Scholar
  5. 5.
    Nigmatulin, R.I. and Bolotnova, R.Kh., High Temp., 2011, vol. 49, no. 2, p. 303.CrossRefGoogle Scholar
  6. 6.
    Aminov, R.Z. and Gudym, A.A., Therm. Eng., 2014, vol. 61, no. 11, p. 822.CrossRefGoogle Scholar
  7. 7.
    Aminov, R.Z. and Gudym, A.A., Tr. Akademenergo, 2016, no. 4, p. 67.Google Scholar
  8. 8.
    Aleksandrov, A.A., Therm. Eng., 1998, vol. 45, no. 9, p. 782.Google Scholar
  9. 9.
    Aminov, R.Z. and Gudym, A.A., Therm. Eng., 2017, vol. 61, no. 8, p. 597.ADSCrossRefGoogle Scholar
  10. 10.
    Teplofizicheskie svoistva tekhnicheski vazhnyhk gazov pri vysokih temperaturakh i davleniyakh. Spravochnik (Thermophysical Properties of Technically Important Gases at High Temperatures and Pressures: A Handbook), Zubarev, V.N., Kozlov, A.D., Kuznetsov, V.M., Sergeeva, L.V., and Spiridonov, G.A., Eds., Moscow: Energoizdat, 1989.Google Scholar
  11. 11.
    GOST (State Standard) R 54500.3-2011; ISO/IEC Guide 98-3:2008. Uncertainty of Measurement. Part 3: Guide to the Expression of Uncertainty in Measurement, Moscow: Standartinform, 2012.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Saratov Scientific Center, Russian Academy of SciencesSaratovRussia

Personalised recommendations