A supercritical (subcritical) reheat back pressure combined heat and power system and control method

By utilizing a supercritical (subcritical) reheat back-pressure cogeneration system, high-parameter steam reheat and cascade utilization are used to solve the problems of cold-end loss and insufficient steam supply capacity of cogeneration units, achieving efficient energy conversion and steam supply flexibility.

CN122280671APending Publication Date: 2026-06-26NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GRP
Filing Date
2026-04-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing cogeneration units suffer from cold-end losses, low initial parameters, lack of reheat systems, and insufficient steam supply capacity, resulting in low thermal efficiency and poor steam supply flexibility.

Method used

The supercritical (subcritical) reheat back-pressure cogeneration system generates high-parameter steam through a steam generation module, which is then reheated and supplied to high-pressure industrial steam. The system also achieves cascade utilization without cold-end loss in the expansion work module. Combined with the extraction module, the steam distribution can be flexibly adjusted to meet the steam demand of multiple levels of industrial applications.

Benefits of technology

It achieves efficient energy cascade utilization, eliminates cold-end losses, improves thermal efficiency, meets the steam demand of multiple levels of industrial use, simplifies the steam supply system, and improves the flexibility and thermal utilization rate of steam supply.

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Abstract

This invention relates to the field of cogeneration technology, specifically to a supercritical (subcritical) reheat back-pressure cogeneration system and its control method. The system includes a steam generation module, an expansion and power generation module, and a steam extraction module. The steam generation module generates main steam based on supercritical or subcritical parameters, and after reheating the reflux exhaust steam, a portion is supplied to high-pressure industrial steam. The expansion and power generation module includes a high-pressure cylinder and an intermediate-pressure cylinder of a turbine with supercritical or subcritical parameters. The high-pressure cylinder receives the main steam, performs work, and then reheats the exhaust steam. The intermediate-pressure cylinder receives a portion of the reheated steam and performs work. The back-pressure exhaust steam is supplied to low-pressure industrial steam. The steam extraction module includes a steam regulating unit that extracts a portion of steam from the intermediate-pressure cylinder; one portion is supplied to intermediate-pressure industrial steam, and the other portion is sent to water preheating. This invention can eliminate cold-end losses, achieve high parameters, reheat cycle, and three-stage steam supply, solving the problems of low initial parameters, lack of reheat, and insufficient steam supply capacity.
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