Additional High-Pressure Bypass Line for Rapid Startup Control
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Solution Overview
Problem
Conventional combined power generation systems face challenges during rapid startup, where excessive steam production leads to uncontrollable reheat steam pressure, impeding rapid system startup and resulting in decreased steam efficiency and increased treatment costs.
Innovation Solution
The introduction of an additional high-pressure bypass line connected from the high-pressure steam line to the condenser, along with a control method that adjusts the additional high-pressure bypass valve based on the reheat steam bypass valve position, enhances steam discharge efficiency, facilitates pressure control, and ensures system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the reheat steam bypass capacity is increased to manage overproduced steam, then the steam discharge effect is improved, but the steam density decreases and the efficiency of steam discharge is reduced
Solution Approach 1:
The patent divides the steam bypass system into multiple independent pathways: the original reheat steam bypass line and the additional high-pressure bypass line. This segmentation allows each line to serve specific functions - the additional high-pressure bypass line handles high-density steam discharge while the reheat steam bypass line manages lower-pressure steam, thereby maintaining overall discharge efficiency while increasing total discharge capacity.
2Productivity
If the combined power generation system is rapidly started, then the productivity is improved, but the reheat steam pressure becomes uncontrollable
Solution Approach 1:
The patent implements dynamic control of the additional high-pressure bypass valve based on real-time system conditions. During rapid startup, when excessive steam production causes uncontrollable reheat steam pressure, the control system dynamically adjusts the valve opening degree to regulate steam flow, enabling pressure control while maintaining rapid startup capability.
Solution Approach 2:
The patent employs a feedback control mechanism where the opening degree of the additional high-pressure bypass valve is determined based on the opening degree of the reheat steam bypass valve and real-time pressure conditions. This feedback loop allows the system to automatically adjust steam discharge to maintain pressure control during rapid startup operations.
3Loss of time
If the additional high-pressure bypass line is added, then the startup time is reduced and pressure control is facilitated, but the device complexity is increased
Solution Approach 1:
The additional high-pressure bypass line is designed to serve multiple functions: it enables rapid steam discharge during startup, provides pressure control capability, and can operate in coordination with the existing reheat steam bypass line during normal operation. This multi-functionality justifies the added complexity by delivering multiple performance benefits from a single structural addition.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the startup time of the combined power plant, improves steam discharge efficiency, and maintains system stability by managing excessive steam production and controlling pressure effectively.
Implementation Method 1
a heat recovery steam generator configured to recover exhaust heat from a gas turbine to produce steam
Implementation Method 2
a condenser installed under the low-pressure turbine to condense steam
Data Source
AI summary
Disclosed herein is a combined power generation system that includes a heat recovery steam generator configured to recover exhaust heat from a gas turbine to produce steam and including a high-pressure superheater and a reheater, a steam turbine operated by receiving the produced steam and including a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine, a condenser installed under the low-pressure turbine to condense steam, a high-pressure steam line for supplying the high-pressure turbine with the steam produced by the high-pressure superheater, a medium-pressure steam line for supplying the medium-pressure turbine with the steam that has passed through the high-pressure turbine, a high-pressure bypass line connected from the high-pressure steam line to the medium-pressure steam line, a reheat steam bypass line connected from downstream of the medium-pressure steam line to the condenser, and an additional high-pressure bypass line connected from the high-pressure steam line to the condenser.