Intelligent control system of steam turbine anti-lock shaft heating device

The hierarchical closed-loop control system, which uses multi-source data acquisition and reliable measurement, solves the problems of uneven temperature difference and inconsistent control of the turbine anti-seize heating device under multiple operating conditions. It achieves stable and traceable anti-seize heating, reduces the risk of seize and the expansion of temperature difference, and improves the reliability of start-up.

CN122082848APending Publication Date: 2026-05-26ZHENLIAN GAS POWER GENERATION (JINHUA) CO LTD
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Patent Information

Application Number
CN202511885777.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-15
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing control system of the turbine anti-shaft seizure heating device has problems under multiple operating conditions, such as uneven temperature difference, uncontrolled heating and cooling rate, inconsistent control strategies, uncontrollable total power limited scenarios, and lack of risk diagnosis and interlock write-back recalculation mechanism. These problems lead to abnormal bearing clearance, difficulty in oil film establishment, rotor thermal bending, excessive vibration and increased risk of shaft seizure.

Method used

A hierarchical closed-loop control system is adopted, which includes multi-source data acquisition, reliable measurement and consistency verification, operating condition state machine, bearing seizure risk index calculation, temperature difference constraint setpoint generation and total power budget. Through the unified caliber of reliable data frames and interlocking/diagnostic write-back and recalculation mechanism, temperature difference window management, temperature rise and fall slope constraints and total power coordinated allocation are realized, forming an adaptive and traceable closed-loop control system.

Benefits of technology

Maintain stable control under conditions such as inconsistent measurement points and sudden noise changes, reduce jitter during multi-condition switching, reduce the risk of temperature difference expansion and bearing seizure, ensure that the thermal boundary conditions of key zones are met first, and achieve full-link traceable operation, maintenance and auditing.

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Abstract

The invention discloses an intelligent control system of a steam turbine anti-lock heating device, which is suitable for working conditions such as shutdown heat preservation, turning, cold-state preheating, hot-state restarting and tripping recovery, and is used for cooperatively heating multiple partitions such as a bearing box / bearing seat / bearing bush, lubricating oil and a selectable shaft seal. The system comprises multi-source acquisition and credibility check, and representative temperature, weight, data quality, change rate and temperature difference derived quantity are generated; a working condition state machine and risk assessment output mode and hot spot; a target temperature, a slope, a temperature difference window and a soft power upper limit are output through constraint and set value scheduling, and when the temperature difference exceeds the window, a lifting cold side / pressing hot side is adopted; the total power budget is guaranteed to the bottom by a key partition under the constraint of an upper limit and is distributed according to weight / hotspot / efficiency, and limited information is fed back to a closed loop to resist saturation / degradation; the execution module completes power adjustment and implements hard / soft interlocking and diagnosis, and interlocking / diagnosis write-back triggers upstream recalculation; and outputting a start permission and a reason code, recording and uploading to the DCS.
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