Mathematical modeling of the high-pressure hydraulic drive of a regulating valve control system of the steam turbine of a steam-electric plant

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BACKGROUND: High-pressure hydraulic drives are used to control the shut-off valves of steam and gas turbines. Currently, there is a trend of transition from the low-pressure control systems to the high-pressure control systems, which leads to decrease of size of a control unit and to ensuring easy reparability. The Bosch Rexroth high-pressure hydraulic actuators are widely used. These hydraulic drives are capable of moving the shut-off valve element during up to 0.3 s.

AIM: Development of the mathematical model to obtain main dynamic characteristics of a hydraulic drive of the regulating valve control system of the steam turbine of a steam-electric plant.

METHODS: The studies of dynamic characteristics were carried out with a numerical method using the MATLAB/Simulink software.

RESULTS: The mathematical model of the high-pressure hydraulic drive of the regulating valve control system of the steam turbine of a steam-electric plant, capable of moving the shut-off valve element during up to 0.3 s, was developed. The dynamical characteristics, such as displacement and velocity of the shut-off valve element of the regulating valve, pressure change in the hydraulic cylinder cavities, displacement of a plunger of a spool valve, are presented. The possibility of reducing the list of the used hydraulic equipment was also considered: a comparison of the system with accelerator valves and without accelerator valves was carried out.

CONCLUSION: The practical value of the study lies in the possibility of using the developed mathematical model in the study of various types of hydraulic drives.

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作者简介

Elizaveta Romanchuk

Peter the Great St. Petersburg Polytechnic University

编辑信件的主要联系方式.
Email: elizabetaromanchuk@yandex.ru
ORCID iD: 0000-0001-8448-8813
SPIN 代码: 4234-0540

1st year Graduate Student of the Higher School of Power Engineering of the Institute of Energy

俄罗斯联邦, 29 Polytekhnicheskaya street, 194064 Saint Petersburg

Lyubov Kotkas

Peter the Great St. Petersburg Polytechnic University

Email: kotkas334@gmail.com
ORCID iD: 0000-0002-5485-2183
SPIN 代码: 7620-2811

1st year Graduate Student of the Higher School of Power Engineering of the Institute of Energy

俄罗斯联邦, 29 Polytekhnicheskaya street, 194064 Saint Petersburg

Alexander Zharkovsky

Peter the Great St. Petersburg Polytechnic University

Email: azharkovsky@gmail.com
ORCID iD: 0000-0002-3044-8768
SPIN 代码: 3637-7853

Dr. Sci. (Engineering), Professor, Professor of the Higher School of Power Engineering of the Institute of Energy

俄罗斯联邦, 29 Polytekhnicheskaya street, 194064 Saint Petersburg

Nikita Zhurkin

Peter the Great St. Petersburg Polytechnic University

Email: zhurkin47@mail.ru
ORCID iD: 0000-0002-2851-5626
SPIN 代码: 8188-7731

Assistant of the Higher School of Power Engineering of the Institute of Energy

俄罗斯联邦, 29 Polytekhnicheskaya street, 194064 Saint Petersburg

参考

  1. Ildiyarov EN, Sizov AN, Chubarov FL. Electromechanical drive-type based, electrohydraulic control circuit for the speed of the steam turbine investigation. Modern high technologies. 2018;4:44–48 (in Russ.)
  2. Gulyy VA. On the question of the use of GTZA with direct transmission on linear nuclear icebreakers. Marine intellectual technologies. 2021;3(1):96–103. (in Russ.) doi: 10.37220/MIT.2021.53.3.038
  3. Tubyansky LI, Frenkel LD. High-pressure steam turbines of the Leningrad Metal Plant. Construction and maintenance. Мoscow: GEIT; 1956. (in Russ.)
  4. Pneumax. [internet] Accessed: 18.12.2023. Available from: https://www.pneumax-msk.ru.
  5. Patent RUS 2670470 / 23.10.2018 Gulyy VA, Ilyin OK, Ostrovsky VG. Gidrosistema ypravlenia klapanami parovoi turbiny. (in Russ.)
  6. Bosch Rexroth. Hydraulic drive for regulating and locking steam and gas turbines [internet] Accessed: 18.12.2023. Available from: https://dc-ru.resource.bosch.com/media/ru/images_45/product_groups_1/me_3/r-rs_08122_2013_02-web.pdf
  7. Voith. Actuators and control systems for turbomachinery. [internet] Accessed: 18.12.2023. Available from: https://voith.com/corp-en/products-services/automation-digital-solutions/actuators-and-control-systems.html
  8. Popov DN. Dynamics and regulation of hydro and pneumatic systems. Moscow: Machinostroenie, 1987;2. (in Russ.)
  9. Bashta ТМ. Mechanical engineering hydraulics. Moscow: Machinostroenie, 1971. (in Russ.).
  10. Borovin GK, Kostyuk AV, Seet G, Yastrebov VV. Computer simulation of hydraulic system of exoskeleton. Matematicheskoe modelirovanie. 2006;10:39–54. (in Russ.)

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2. Fig. 1. The Bosch Rexroth hydraulic drive for turbine valves control: а — a general view; b — a hydraulic circuit diagram.

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3. Fig. 2. The analytical diagram of the studied regulating valve (RV) control system: ЭМП — an electric-mechanical transducer; С-З — a ‘nozzle-flapper’ hydraulic power assist; P1 — a spool valve; Ц — a hydraulic cylinder; p0 — pressure in the pump line; pсл — pressure in the discharge line; pну — pressure of the control pump; xн — displacement of the spool valve plunger; p1 — pressure in the working cavity of the hydraulic cylinder; p2 — pressure in the discharge cavity of the hydraulic cylinder; Q1 — working fluid inlet rate; Q2 — working fluid outlet rate; M — mass of the shut-off valve element; y — displacement of the shut-off valve element of the RV; cпр — spring stiffness; h — viscous friction coefficient.

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4. Fig. 3. The mathematical model of the system without the accelerating valves in the MATLAB/Simulink software.

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5. Fig. 4. The block diagram of the two-stage proportional electrohydraulic valve P1.

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6. Fig. 5. The mathematical model of the system with the accelerating valves in the MATLAB/Simulink software.

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7. Fig. 6. Displacement of the plunger of the spool valve.

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8. Fig. 7. Displacement of the shut-off valve element of the RV.

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9. Fig. 8. Velocity of the shut-off valve element of the RV.

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10. Fig. 9. Pressure changes in the hydraulic cylinder cavities.

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