INFLUENCE OF THERMAL RESISTANCE OF AIR CONDENSER TUBES ON STEAM COOLING EFFICIENCY

Authors

  • J. Jianguo National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky" , China
  • G. Varlamov National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky" , Ukraine https://orcid.org/0000-0002-4818-2603
  • K. Romanova National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky" , Ukraine https://orcid.org/0000-0001-9738-3383
  • L. Suxiang Energy Research Institute of Shandong Academy of Sciences (Jinan, China), China
  • L. Zhigang Energy Research Institute of Shandong Academy of Sciences (Jinan, China), China

DOI:

https://doi.org/10.20535/1813-5420.4.2020.233595

Keywords:

condenser, air cooling, urgent resistance, cooling efficiency

Abstract

The research is carried out using a mathematical model of conditions and features of condensation processes with the influence of changes in internal and external thermal resistances of working bodies, which occur during contamination of outside and inside metal pipes of heat exchange surfaces of air condenser. capacitor. Particular attention is paid to the selection, detailing and determination of more than twenty basic parameters that characterize the operation of the direct cooling unit of the condensing unit for the summer, the conditions of heat transfer processes between the working bodies taking into account the finned outer surface of elliptical condenser tubes. The results of experiments on the mathematical model are analyzed and the influence of the incoming air velocity and ambient temperature on the output steam pressure in the condenser direct air cooling system within the change of internal and external thermal resistances in the range 0-0.001(m2·K)/W due to cooling tube contamination is determined. air condenser steam turbine installation. Conditions, character and features of influence of thermal resistance of pollution in cooling tubes on steam pressure at an exit from them are defined, the basic factors defining steam pressure at an exit, necessity of the organization of control of thermal resistance of pollution in a pipe during unit operation at variable operating conditions and expediency is substantiated. conducting test studies of operating modes while taking into account the influence of thermal resistance of external and internal pollution on the thermal efficiency of the cooling unit.

Studies have shown that at a fixed value of the heat load of the exhaust steam, the pressure of the steam outlet increases with increasing ambient temperature and decreasing the speed of the incoming air.

References

Bezrodny M.K., Varlamov G.B., Kudelya P.P. Heat transfer at free convection and boiling of water and freon-12 on a plate in the field of centrifugal forces // Scientific news of NTUU "KPI". -1999. -No2. - P.26-31.

Verkin B.I., Kirichenko Y.A., Rusanov K.V. Heat exchange at boiling of cryogenic liquids. Kiev: Naukova Dumka, 1987. 264p.

Butuzov A.I. etc. Experimental data on boiling of freon-12 and water at free movement in the conditions of inertial overloads. - Thermophysics of high temperatures, 1969, 6, No3, p. 490-494.

Kalimullina D.D., Gafurov A.M. New cooling systems for condensers of steam turbines at TPPs. // International scientific journal "Innovative Science". - No3 / 2016. - p.100-101.

Gafurov A.M., Gafurov N.M. Replacement of air cooling of steam turbine condensers with a CO2 circulation loop. // Innovative Science. - 2016. - No. 1-2 (13). - p. 27-29.

Gafurov A.M., Gafurov N.M. Replacement of air cooling of steam turbine condensers with a circulation loop for C3H8. // Innovative Science. - 2016. - No. 1-2 (13). - p. 29-31.

Ding Ermou. Air cooling technology in power plant. – Beijing: Water Conservancy and Electric Power Publishing House, 1992.– 218 p.

E. S. Millias. Air-cooled power plant . – Beijing: Machinery Industry Press, 1986.– 186 p.

Gureev V.M., Ermakov A.M., Misbakhov R.Sh., Moskalenko N.I. Numerical modeling of a shell-and-

tube heat exchanger with annular and semi-annular recesses. // Industrial energy. - 2014. - No. 11. - p. 13-16.

Moskalenko N.I., Misbakhov R.Sh., Ermakov A.M., Gureev V.M. Modeling the processes of heat transfer and hydrodynamics in a shell-and-tube heat exchanger. // News of higher educational institutions. Energy problems. - 2014. - No. 11-12. - p. 75-80.

Varlamov G.B., Priymak K.O., Olinevich N.V., Ocheretyanko M.D. Features of integrated energy assessment of the actual environmental performance of energy facilities. // Electromechanical and energy saving systems - 2015 - No4 / 2015 (32). - p. 75-81.

Yan Junjie, Zhang Chunyu. Theoretical study on the characteristics of direct air cooling system under variable operating conditions . – Thermal Power Engineering.–2000 (6), 601-603pp.

Zhang Chunyu. Study on Economic diagnosis theory of air cooling unit operation in thermal power plant . – Xi'an: Xi'an Jiaotong University, 2000.– 240 p.

Yan Junjie, Zhang Chunyu. Study on economic diagnosis theory of direct air cooling unit .–Journal of Test Technology, North China Institute of Technology.–2000 (1), 1-6pp.

Yang Shiming. Heat transfer .– Beijing: Higher Education Press, 1998.– 170 p.

Zhu Xiuguan. Principle and calculation of heat exchanger.– Beijing: Tsinghua University Press. – 1987, 346-348pp.

Zhou Lanxin, Yang Jing, Yang Xiangliang. Study on variable operating condition characteristics of 600MW direct cooling unit . – Power Engineering. – 2007 (6), 623-627pp.

Gardner David, Fontes Roger, Casey, Richard. Bundling advanced technologies to achieve maximum efficiency and environmental acceptability in a modern coal-fired power plant. – Proceedings of the 2003 International Joint Power Generation Conference. – 2003, 1011-1029pp.

Gureev V.M., Misbakhov R.S., Ermakov A.M., Moskalenko N.I. Increasing the efficiency of shell- and-tube heat exchangers with the use of well and semi-circular recesses. // Energy of Tatarstan. - 2014. - No. 3-4 (35-36). - p. 61-64.

Misbakhov R.S., Moskalenko N.I., Ermakov A.M., Gureev V.M. Intensification of heat transfer in a heat exchanger using well intensifiers. // News of higher educational institutions. Energy problems. - 2014. - No. 9-10. - p. 31-37.

Downloads

Published

2020-04-27

Issue

No. 4 (2020): 62

Section

ENERGY EFFICIENCY AND ENERGY SAVINGS

License

Автори, які публікуються у цьому журналі, погоджуються з наступними умовами:

  1. Автори залишають за собою право на авторство своєї роботи та передають журналу право першої публікації цієї роботи на умовах ліцензії Creative Commons Attribution License, котра дозволяє іншим особам вільно розповсюджувати опубліковану роботу з обов'язковим посиланням на авторів оригінальної роботи та першу публікацію роботи у цьому журналі.
  1. Автори мають право укладати самостійні додаткові угоди щодо неексклюзивного розповсюдження роботи у тому вигляді, в якому вона була опублікована цим журналом (наприклад, розміщувати роботу в електронному сховищі установи або публікувати у складі монографії), за умови збереження посилання на першу публікацію роботи у цьому журналі.
  1. Політика журналу дозволяє і заохочує розміщення авторами в мережі Інтернет (наприклад, у сховищах установ або на особистих веб-сайтах) рукопису роботи, як до подання цього рукопису до редакції, так і під час його редакційного опрацювання, оскільки це сприяє виникненню продуктивної наукової дискусії та позитивно позначається на оперативності та динаміці цитування опублікованої роботи (див. The Effect of Open Access).