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第26届中国控制与决策会议

作者： HOU Guolian JIANG Pengcheng ZHENG Xiaobin ZHANG Jianhua School of Control and Computer Engineering North China Electric Power University

ISBN: (纸本)9781479937097

Taking the 1000 MW ultra-supercritical once-through boiler as a research object, the combustion process of boiler is analyzed through principles of energy transferring, heat exchange, and mass flow balances. Since the complete and accurate model of boiler combustion is the basis of performance study and optimizing control, a mechanism mathematical model of boiler combustion control system is built up in this paper. It is the first time that boiler combustion control system has successfully covered the coal mill pulverizing system, and this model consists of the other three controlled variables subsystems: main steam pressure control system, furnace pressure control system and flue gas oxygen content control system. Furthermore, this paper gives the simulation of the mechanism mathematical model and analyzes the response curves of the outputs after giving each input a step disturbance respectively at two different load conditions. The results of the simulation show that the mathematical model is reasonable and effective.

关键词： ultra-supercritical unit combustion control system mechanism mathematical model simulation

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Exergy Analysis and Thermal Optimization of a Double-Turbine Regeneration System in a ultra-supercritical Double-Reheat unit

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Fluid Dynamics & Materials Processing 2021年第1期17卷 71-80页

作者： Shidan Chi Tao Luan Yan Liang Xundong Hu Yan Gao School of Energy and Power Engineering Shandong UniversityJinan250061China Shandong Electric Power Engineering Consulting Institute Co. Ltd.Jinan250061China School of Thermal Engineering Shandong Jianzhu UniversityJinan250061China

Improving the primary steam parameters is one of the most direct ways to improve the cycle efficiency of a powergeneration system. In the present study, the typical problem connected to the excessively high superheat degree ofextraction steam in an ultra-supercritical (USC) double-reheat unit is considered. Using a 1000 MW power plantas an example, two systems (case 1 and case 2) are proposed, both working in combination with a regenerativesteam turbine. The thermal performances of these two systems are compared with that of the original systemthrough a heat balance method and an exergy balance strategy. The results reveal that the two coupled systemscan significantly reduce the superheat degree of extraction steam, turbine heat rate, and coal consumption of theunit and improve the energy utilization efficiency. These results will provide useful theoretical guidance to futureinvestigators wishing to address the general problem relating to energy conservation and modelling of the coupledextraction steam regenerative system of USC double-reheat units.

关键词： ultra-supercritical unit exergy loss thermal performance regenerative steam turbine superheat degree

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Optimization of coordinated control system considering on-line correction of coal quality

Optimization of coordinated control system considering on-li...

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第三十九届中国控制会议

作者： Ping Boyu De-liang Zeng Gongqing Liu Pengfei Sun Shuo Kong Li Gengda Chen Baowei School of Control and Computer Science North China Electric Power University Guodian New Energy Technology Research Institute

In this paper, a simplified non-linear model of ultra-supercritical units and a soft sensor model for net calorific value of coal are studied. The generalized predictive control algorithm is applied to the control scheme, and the net calorific value is taken into account in feedforward of predictive controller to enhance the accuracy of prediction. Simulation results show that the control scheme can effectively inhibit the disturbance of coal quality, thereby improving the variable load rate and stability of the unit. The results have been successfully applied to a 660 MW thermal power unit, and have achieved good control performance.

关键词： net calorific value predictive control algorithm ultra-supercritical unit coordinated control system

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