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Real-time control algorithm of International Association for the Properties of Water and Steam (IAPWS)-IF 97 based on thermal properties of water and steam

An IAPWS-IF97, thermal technology, applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve complex real-time control problems, and achieve good modularization, high reliability, and reusable reliability Effect

Active Publication Date: 2012-07-04
SHANGHAI BOILER WORKS +1
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Problems solved by technology

[0007] Completely different from general-purpose calculation software, the complete IAPWS-IF97 formula is still too complex for real-time control, and most of its functions are unnecessary in DCS

Method used

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  • Real-time control algorithm of International Association for the Properties of Water and Steam (IAPWS)-IF 97 based on thermal properties of water and steam
  • Real-time control algorithm of International Association for the Properties of Water and Steam (IAPWS)-IF 97 based on thermal properties of water and steam
  • Real-time control algorithm of International Association for the Properties of Water and Steam (IAPWS)-IF 97 based on thermal properties of water and steam

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Embodiment Construction

[0028] Attached below figure 1 And attached figure 2 The embodiments of the present invention are described in detail, and the embodiments are implemented on the premise of the technical solutions of the present invention and provide specific implementation solutions and system structures, but the protection scope of the present invention is not limited to the following embodiments.

[0029]Case 1: The process control system 12 of a 660MW ultra-supercritical unit in a power plant is a domestic distributed control system DCS with completely independent intellectual property rights. The process controller 13 (Process Control Unit, PCU) of this system provides algorithm extension based on C language function, adopt the present invention to develop the water and water vapor real-time calculation module 10-IFC97 based on IAPWS-IF97, and recompile the algorithm link library of the process controller PCU, the input / output signal and the available input / output signal of the upgraded ...

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Abstract

The invention provides real-time control algorithm of International Association for the Properties of Water and Steam (IAPWS)-IF 97 based on thermal properties of the water and the steam. The algorithm carries out modular processing on a formula of the IAPWS-IF 97 from engineering practical, safe and reliable angles, can finish calculation of the thermal properties of normally-seen water and steam under the condition of small load calculation, is suitable for being applied to finishing the high-accuracy calculation of the thermal properties of the water and the steam in various process control systems, is particularly specific to needs of monitoring operation of a supercritical unit with variable-pressure operation at present, and makes up the defects of a function of online calculation of the thermal properties of the water and the steam of an exiting automatic control system.

Description

technical field [0001] The invention relates to a real-time control method, in particular to a real-time control algorithm based on the thermal properties of water and steam IAPWS-IF97. It belongs to the field of thermal automatic control. Background technique [0002] The calculation of water and steam properties is inseparable from the design and manufacture of equipment and systems in the field of steam power engineering, production operation, performance analysis and experimental research. The International Society for the Thermodynamic Properties of Water and Steam (IAPWS) passed in 1997 and published a new formula IAPWS-IF97 for calculating the thermal properties of industrial water and steam in 1998. Compared with the original IFC67 formula, this formula has many advantages and has become a new international standard [1] . [0003] There are usually two methods for calculating the properties of water and steam: (1) establish an electronic data table, use 4-point li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 叶敏徐雪元丁怡若吴乃新孙晅
Owner SHANGHAI BOILER WORKS
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