Mathematical Models of Cogeneration Steam Turbines Based on Experimental Characteristics of Turbine Stages and Compartments

Tatarinova, N. V.; Суворов, Д. М.; Sushchikh, V. M.

doi:10.24223/1999-5555-2017-10-4-330-339

Cited by 4 publications

(1 citation statement)

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“…Важен правильный выбор технологической схемы, основного и вспомогательного оборудования, их конструктивных характеристик, оптимального распределения тепловых и электрических нагрузок между основным оборудованием, использование технологий повышения энергетической и экономической эффективности работы ТЭУ [1,2]. Необходимо учитывать влияние изменения показателей критически важных технологических процессов, например, внутреннего относительного КПД отсеков турбины как одной из основных величин, характеризующих уровень эффективности работы турбины [3,4], и конструкционных материалов (прочностных характеристик металла оборудования, работающего при наиболее высоких темпера-турах, давлениях и т. д.)…”

Section: Introductionunclassified

Evaluation of the Performance Indicators of a Cogeneration STU as Affected by Changing the Internal Relative Efficiency of the Backpressure Steam Turbine Compartments

Stepanova¹,

Киреев²

2021

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The authors carried out the circuit-parametric optimization studies of a promising cogeneration STU, which includes a backpressure steam turbine and a gas-fired steam boiler capable of heat recovery from flue gases. A mathematical model was employed to analyze how the internal relative efficiency of the steam turbine compartments in such an STU could affect the core operating parameters and the design characteristics of the heat exchange equipment of the unit. Mathematical modeling and circuit-parametric optimizations were run in the Machine Programming System, a software package developed by the Department of Heat and Power Systems, Melentiev Energy Systems Institute, Siberian Branch of the Russian Academy of Sciences. The optimization criterion was the price of STU-supplied electricity at the given prices of supplied heat and fuel with the adjustment for the internal rate of return on investment. Circuit-parametric optimizations show that the price of electric energy from a cogeneration STU linearly depends on the internal relative efficiency of the turbine compartments, and when it changes from 0.82 to 0.9, the price of electric energy decreases by 0.03 cents/kW. The cost effect of the increase in efficiency can be up to 98.79 thous. USD/year given the quantitative supply of electricity from the STU. The methodological approach used in this work enables feasibility testing of the attempts to improve the internal relative efficiency of the steam turbine compartments and can be useful both in the design and operation of thermal power plants. The estimated effects of internal relative efficiency of the turbine compartments on the core operating parameters and the characteristics of the unit will help determine the reliability and efficiency of its operation.

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Section: Introductionunclassified

Evaluation of the Performance Indicators of a Cogeneration STU as Affected by Changing the Internal Relative Efficiency of the Backpressure Steam Turbine Compartments

Stepanova¹,

Киреев²

2021

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Make-up Water Heating Capability, Conditions, and Efficiency in Built in Bundles when Cooling Water Is Concurrently Piped through the Main Condenser Bundles

et al. 2019

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The method of considering the efficiency of flow compartments of multi-stage turbines when calculating energy characteristics

Gubarev

2023

Izvestiya MGTU MAMI

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BACKGROUND: Modern methods of calculating energy characteristics of steam turbine units (STU) are based on development of digital models. Considering this, the main components of the STU’s model is a model of a multistage turbine. AIMS: Improvement of existing methods of calculating energy characteristics taking into account influence of efficiency of flow compartments. METHODS: Results of the studies dealing with new methods of development of energy characteristics of multi-stage turbines are presented in the article. In particular, the new method of considering the influence of changing the efficiency of flow compartments of multi-stage turbines depending on working body flow rate is proposed. The method of calculation of turbine energy characteristics is given. The proposed method is based on development of the model of a turbine unit taking into account changing of technical and economic performance of its specific elements depending on the load. RESULTS: Results of theoretical justification of a non-linear dependency of turbine flow compartments’ power on working body flow rate based on changing internal efficiency of stages at variable modes described with the Stodola-Fluegel equation are given in the article. Based on the solution of the Stodola-Fluegel equation, the equation for vane efficiency and the equation of isentropic heat drop, the dependence of flow compartment’s operation efficiency on relative working body flow rate is obtained. The advice for using it when modelling turbines is given. The analysis of the experimental data obtained at the testing of the PT-60-130/13 steam turbine was carried out. Experimental dependency of the stages’ efficiency on steam flow rate are presented. It is established that the proposed dependency of internal efficiency of turbines’ flow compartments complies with the theoretical and experimental data in a good quality and can be used in calculation of energy characteristics and modelling. As a practical value of the study, the model of the PT-60-130/13 turbine unit was developed. The mode diagram built with the use of the model and complying with the heat testing results is given. CONCLUSIONS: The developed model of the turbine unit helps to simulate any operation mode depending on electric and heat loads. In addition, with the use of the model, it is possible to take into account the influence of deviation of external factors from nominal values at development of the system of correction or estimation of fuel consumption increase related to these deviations.

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Mathematical Models of Cogeneration Steam Turbines Based on Experimental Characteristics of Turbine Stages and Compartments

Cited by 4 publications

References 0 publications

Evaluation of the Performance Indicators of a Cogeneration STU as Affected by Changing the Internal Relative Efficiency of the Backpressure Steam Turbine Compartments

Evaluation of the Performance Indicators of a Cogeneration STU as Affected by Changing the Internal Relative Efficiency of the Backpressure Steam Turbine Compartments

Make-up Water Heating Capability, Conditions, and Efficiency in Built in Bundles when Cooling Water Is Concurrently Piped through the Main Condenser Bundles

The method of considering the efficiency of flow compartments of multi-stage turbines when calculating energy characteristics

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