Development of a Mathematical Model for Obtaining Energy Characteristics of the Turbine Unit with the K-325-23.5 Steam Turbine

: pp. 81 – 89
Received: September 13, 2022
Revised: October 19, 2022
Accepted: October 26, 2022
Lviv Polytechnic National University

The results of mathematical modelling of the turbine unit with the K-325-23.5 steam turbine are presented. The mathematical model of the turbine is a system of equations for the components of the heat-balance diagram and the main dependencies of its operating characteristics obtained through the thermal full-scale tests. The developed mathematical model allows adjusting the results of the full-scale tests, creating normative characteristics and conducting research of the intermediate modes of the turbine operation. It is suggested to obtain correction curves for the main parameters of the turbine unit by conducting a simulation experiment on a mathematical model of the turbine instead of carrying out real tests. The correction is done by a complete recalculation of the turbine and its thermal cycle, taking into account the characteristics of the components of the turbine unit and the conditions of its operation during the test. As a result, the main energy characteristics under different operating conditions have been obtained, in particular, correction curves of the main steam consumption and specific heat consumption for the deviation of the initial steam parameters and changes in the heat-balance diagram were built.

  1. Sakharov А.М. Thermal testing of steam turbines / А.М. Sakharov // Moscow – Energoizdat. – 1990. – P.8. (in Russian)
  2. IEC 953-2. Rules for steam turbine thermal acceptance tests. Part 2: Method B – Wide range of accuracy for various types and sizes of turbines./ International standard. // First edition. - 1990. – P. 125.
  3. DIN 1943. Thermal acceptance tests of steam turbines. / Standard by Deutsches Institut Fur Normung E.V. - 1975. – P. 52.
  4. ASME PTC 6-2004. Steam Turbines. Performance Test Codes. / An American National Standard. // The American Society of Mechanical Engineers. – October. – 2005. – P. 67.
  5. Typical energy characteristics of the K-300-240 HTGZ turbine unit of the second modification. / SPO ORGRES. // Moscow. - 1976. –        P. 13. (in Russian)
  6. Riabokon H.О. Analysis of methods for bringing the results of thermal testing of the K-325-23.5 turbine to nominal conditions / H.О. Riabokon, Y.S. Mysak // Bulletin of Engineering Academy. – 2016. – No. 2. – P.140. (in Ukrainian)
  7. А.А. Palagin. Simulation experiment on mathematical models of turbine units. / Palagin А.А. Efimov А.V. // Naukova Dumka. - Kyiv. - 1986. – P. 6. (in Ukrainian)
  8. I. Prisecaru. Saturated steam turbine operation modeling with application at NPP Cernavoda / I. Prisecaru, D. Dupleac // U. P. B. Sci. Bull. – Serias C. – Volume 68. – No. 3. – 2006. – P. 3-14.
  9. C. Maffezzoni. Issues in modeling and simulation of power plants / C. Maffezzoni // IFAC Proceeding Volumes. – Volume 25. – Issue 1. – March 1992. – pp. 15-23.
  10. Kliamkin S.L. Thermal testing of steam turbine units of power plants. / S.L. Kliamkin // Gosenergoizdat. – Leningrad. – 1961. – P. 367. (in Russian)
  11. IAPWS R7-97. Revised Release on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam /The International Association for the Properties of Water and Steam // Lucerne, Switzerland. – August 2007. – P. 8.
  12. Riabokon H.О. Comparative studies of the calculated technical and economic indicators of the K-325-23.5 turbine and the results of thermal testing. / H.О. Riabokon, Y.S. Mysak // Bulletin of the National Technical University "Kharkiv Polytechnic Institute". Series: Energy and heat engineering processes and equipment – Kharkiv: NTU "KhPI", 2016 - No.8 (1180). P. 72-80. (in Ukrainian)
  13. MU 34-70-093-84. Guidelines for thermal testing of steam turbines. / Soyuztekhenergo. // Moscow. - 1986. - P. 80. (in Russian)
  14. Riabokon H.О. Construction of correction curves for the deviation of the steam parameters and heat-balance diagram of the turbine unit from the nominal parameters using a mathematical model / H.О. Riabokon, Y.S. Mysak // Bulletin of Engineering Academy, - 2016. – No. 3. – P. 261. (in Ukrainian)
T. Kravets, H. Riabokon. Development of a mathematical model for obtaining energy characteristics of the turbine unit with the K-325-23.5 steam turbine. Energy Engineering and Control Systems, 2022, Vol. 8, No. 2, pp. 81 – 89.