A method and device for controlling the wall temperature of a pressurized oxy-combustion sCO2 boiler

By dividing the wall temperature measurement points of the pressurized oxygen-enriched combustion supercritical carbon dioxide boiler into regions and analyzing the data, and by combining the flue gas recirculation ratio and working fluid diversion adjustment, the zoned controllability and overall uniformity of the boiler wall temperature were achieved. This solved the wall temperature control problem under the coupled operation of pressurized oxygen-enriched combustion and supercritical carbon dioxide circulation, and ensured the safety and stability of the system.

CN122172899APending Publication Date: 2026-06-09HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2026-02-02
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Under the coupled operation of pressurized oxygen-enriched combustion and supercritical carbon dioxide circulation, boiler wall temperature control is difficult to meet the heat exchange safety requirements. In particular, under high pressure, the wall temperature of the heating surface is highly sensitive to external heat load disturbances. Traditional methods are difficult to achieve dual-sided coupled control of the furnace heat load distribution and the working fluid cooling capacity.

Method used

By dividing the wall temperature measurement points of a pressurized oxygen-enriched combustion supercritical carbon dioxide boiler into regions, the original wall temperature dataset is obtained. Average temperature analysis and control quantity analysis are then performed. Combined with the flue gas recirculation ratio and working fluid diversion adjustment, the zoned controllability and overall uniformity of the heating surface wall temperature are achieved.

Benefits of technology

It achieves zoned controllability and overall uniformity of the wall temperature of the heating surface, ensuring the long-term safe and stable operation of the coupled system and solving the problems of uneven heat load distribution in the furnace and local overheating of the heating surface.

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Abstract

The application provides a pressurized oxygen-enriched combustion sCO2 boiler wall temperature control method and device, and belongs to the technical field of boiler control. The method comprises the following steps: dividing all wall temperature measuring points in a pressurized oxygen-enriched combustion supercritical carbon dioxide boiler wall into multiple boiler wall regions; obtaining original wall temperature data sets from each wall temperature measuring point in each boiler wall region; and performing average temperature analysis on the original wall temperature data sets to obtain a boiler wall average temperature value and a wall temperature vector. The application realizes zoned controllability and overall uniformity of the heating surface wall temperature, adjusts the wall temperature through large-scale flue gas recirculation and multi-stage working fluid distribution, provides a basis for ensuring long-term safe and stable operation of the coupled system, and solves the problems of uneven distribution of the furnace heat load, local overheating of the heating surface, and mismatch between the furnace heat load and the sCO2 cooling capacity in the pipe.
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