Energy-saving optimization method and system for circulating water system of ultra-supercritical unit

By constructing a thermo-cold end coupling model and a mathematical model of the circulating water system of an ultra-supercritical unit, the operation mode of the circulating water pump is optimized, solving the problem that the equipment coupling relationship was not considered in the existing technology, realizing the high-efficiency energy-saving optimization of the circulating water system, and reducing energy consumption and carbon emissions.

CN120930339APending Publication Date: 2025-11-11ZHEJIANG UNIV
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Patent Information

Application Number
CN202511030773.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-25
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing optimization methods for circulating water systems in ultra-supercritical units fail to fully consider the coupling relationships between equipment, resulting in deviations between optimization results and actual operating conditions. They also lack global optimization and have high energy consumption of circulating water pumps.

Method used

A steam turbine thermodynamic system model was constructed and verified. Coupled analysis was performed with the cold end system model to determine the steam turbine power-back pressure characteristics, condenser performance, and cooling tower characteristics. The operating parameters of the circulating water pumps under single-pump and parallel operation conditions were calculated by constructing a mathematical model of the circulating water system, and a scientific and reasonable energy-saving optimization strategy was formulated.

Benefits of technology

It improves the operating efficiency of the circulating water system, reduces energy consumption, and decreases the plant's electricity consumption rate, which meets the requirements of the national energy conservation and emission reduction policy.

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Abstract

The invention relates to the technical field of circulating water system optimization, and discloses an ultra-supercritical unit circulating water system energy-saving optimization method and system.The method comprises the steps that a steam turbine thermodynamic system model is built based on an equipment assembly of an ultra-supercritical unit circulating water system and verified, and the steam turbine thermodynamic system model is obtained; determining whether the precision of the steam turbine thermodynamic system model meets the requirement or not; constructing a cold end system model, coupling the cold end system model with the steam turbine thermodynamic system model to obtain a thermodynamic-cold end system coupling model, and determining steam turbine power-back pressure characteristics, condenser performance and cooling tower characteristics based on the thermodynamic-cold end system coupling model; constructing a circulating water system mathematical model, and calculating single-pump and parallel operation condition parameters of the circulating water pump; and determining an optimization operation model and an operation constraint condition, and determining an energy-saving optimization strategy of the circulating water system by adopting basin jump algorithm coupling sequence least square programming combination optimization. The operation efficiency of the ultra-supercritical unit circulating water system is improved, and the energy consumption is reduced.
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