A coal-fired power turbine unit with wide load depth peak shaving

By flexibly adjusting the flow ratio of the high-pressure cylinders and low-pressure cylinders of the coal-fired power turbine unit and controlling the valves, the economic and safety issues of the coal-fired power turbine unit in operation over a wide load range have been solved, achieving efficient and safe wide-load deep peak shaving.

CN122082853APending Publication Date: 2026-05-26DONGFANG TURBINE CO LTD
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Patent Information

Application Number
CN202610472073.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-10
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing coal-fired power turbine units have limited economic improvement over a wide load range, especially during deep peak shaving, which presents safety hazards and increased heat consumption.

Method used

By setting the flow ratio between the first and second high-pressure cylinder groups to 1:n and the flow ratio between the first and second low-pressure cylinders to 1:1, and flexibly adjusting the operating status of each cylinder under different load conditions, combined with the valve control of the main steam, reheat steam and exhaust pipes, precise steam distribution and cooling can be achieved, avoiding overheating of the blower.

Benefits of technology

It has enabled the coal-fired power turbine unit to operate efficiently over a wide load range, improving overall operating efficiency and economy, reducing heat consumption, enhancing safety, and lowering retrofit costs.

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Abstract

This invention relates to the field of steam turbine technology, and discloses a coal-fired power turbine unit with wide-load, deep peak-shaving capability, comprising a boiler, cylinder bank, main generator, condenser, small turbine, and regenerative system. The cylinder bank includes a first high- and intermediate-pressure cylinder bank, a second high- and intermediate-pressure cylinder, a first low-pressure cylinder, and a second low-pressure cylinder. The flow ratio between the first high- and intermediate-pressure cylinder bank and the second high- and intermediate-pressure cylinder is 1:n, where the value of n is determined according to the peak load distribution. The flow ratio between the first low-pressure cylinder and the second low-pressure cylinder is 1:1. Under low-load conditions, the first high- and intermediate-pressure cylinder bank and the second low-pressure cylinder are in operation, while the second high- and intermediate-pressure cylinder and the first low-pressure cylinder are in non-operational states. Under medium-load conditions, the second high- and intermediate-pressure cylinder, the first low-pressure cylinder, and the second low-pressure cylinder are in operation, while the first high- and intermediate-pressure cylinder bank is in non-operational states. Under high-load conditions, the first high- and intermediate-pressure cylinder bank, the second high- and intermediate-pressure cylinder, the first low-pressure cylinder, and the second low-pressure cylinder are in operation. This invention enables efficient operation under wide loads and improves the economic efficiency of wide-load operation.
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