Using the Openmodelica Environment to Simulate Start-Ups of a Triple-Pressure Heat-Recovery Steam Generator
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Vol. 54, No. 4, November, 2020
USING THE OPENMODELICA ENVIRONMENT TO SIMULATE START-UPS OF A TRIPLE-PRESSURE HEAT-RECOVERY STEAM GENERATOR A. S. Shabunin1 Translated from Élektricheskie Stantsii, No. 6, June 2020, pp. 6 – 12.
A dynamic model of a triple-pressure heat-recovery steam generator (HRSG) is developed. The basic equations of the model are described. Cold and hot start-ups of an HRSG are simulated. The simulation results are compared with archive data on start-ups of real equipment. Conclusions on future application of the simulation data are drawn. Keywords: combined-cycle power plant; heat-recovery steam generator (HRSG); start-up; mathematical simulation; object-oriented modeling; Modelica; OpenModelica.
The Modelica programming language was developed to simulate the dynamics of engineering systems based on the OOM principle. It allows modeling systems containing mechanical, electric, electronic, hydraulic, thermal, power-generating, and control components and components related to individual processes [1]. No special programming skills are required. Each model is a system of differential and algebraic equations solved with built-in numerical methods. The chosen triple-pressure heat-recovery steam generator is widely used as a part of combined-cycle power units. Its design parameters are similar to those of the HRSGs installed at the Mosenergo CHPP-16 and Novo-Salavatskaya CHPP. The HRSG model consists of standard models (valves, boundary conditions, sensors, logic blocks, etc.) from the Modelica library and models specially created for the purpose of the present study (heating surfaces, pipelines, drums, controllers, etc.). The Models Developed. The model of the steam-andwater side is the basis for modeling a heating surface of the HRSG. It is a lamped-parameter model of a section of one heat-transfer tube row that is shorter than or as long as a heat-transfer tube and consists of the same number of tubes as there are in one row. By combining many such models, it is possible to model complex heating surfaces as distributed-parameter models (in the direction of motion of the heat-transfer medium). The model of the steam-and-water side includes the following equations.
Mathematical simulation has been taking on greater and greater importance for studies of the operating modes of the equipment of thermal power plants (TPPs). A TPP is a complex system consisting of a great many units of interconnected equipment. Therefore, the most popular method is to create its mathematical model from models of its components (equipment), which can be connected to each other to form a single system. Such a technique is called object-oriented modeling (OOM). In most cases, dynamic models of boilers are developed using proprietary software or contracting a software developer. A model is usually restricted to the ranges of operating modes and design solutions in which it operates correctly because the developer cannot cover all physical processes occurring in real equipment. For example, a real steam pipeline can be fil
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