Steam Flow Dispatching for Pressure Stability and Economic Efficiency
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Solution Overview
Problem
Traditional steam pressure control systems in industrial plants are inefficient due to their reliance on pressure reducing valves, leading to suboptimal economic performance and revenue loss, as they fail to effectively manage steam flow variations across complex pathways and sub-networks.
Innovation Solution
A control system that dispatches a single steam flow command to multiple control elements based on prioritization and responsiveness, using a smart splitter to allocate steam flow according to a priority scheme and adjust allocations based on feedback signals, optimizing pressure control and economic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pressure reducing valves are used for steam pressure control, then pressure stability can be maintained, but economic performance deteriorates and revenue is lost
Solution Approach 1:
The patent segments the single steam flow command into multiple allocated flows distributed to different control elements (turbines, heat exchangers, etc.) based on priority schemes and responsiveness. This segmentation allows the system to optimize economic performance by directing steam to the most valuable uses while maintaining pressure stability through coordinated control of multiple elements rather than relying solely on pressure reducing valves.
Solution Approach 2:
The system dynamically adjusts steam flow allocation among control elements based on real-time feedback signals regarding their responsiveness and current operating conditions. This dynamic allocation enables the system to adapt to changing plant conditions and optimize economic performance continuously, rather than using static pressure reducing valve settings.
2Reliability
If traditional pressure control methods manipulate inlet and outlet flows focally, then pressure offset can be corrected, but system complexity increases and economic optimization is lost
Solution Approach 1:
The dispatching device serves multiple functions: it allocates steam flow to multiple control elements, prioritizes their operation based on economic value, monitors their responsiveness through feedback, and dynamically adjusts allocations. This multi-functional approach consolidates what would otherwise require multiple separate control systems into a single intelligent controller, managing complexity while enabling comprehensive optimization.
Solution Approach 2:
The system implements feedback mechanisms where control elements report their responsiveness and operating status to the dispatching device. This feedback enables the system to automatically adjust steam flow allocations in real-time, maintaining pressure control and economic optimization without requiring complex manual intervention or overly sophisticated control architecture.
3Reliability
If pressure reducing valves are heavily relied upon, then pressure regulation is achieved, but productivity and economic viability decrease
Solution Approach 1:
By segmenting steam flow control across multiple control elements (turbines for power generation, heat exchangers for process heat, etc.) rather than using pressure reducing valves as the primary control mechanism, the system enables steam to be directed to applications with highest economic value, thereby improving productivity and economic viability while maintaining pressure regulation through coordinated control.
Solution Approach 2:
The system changes the control parameter from purely pressure-based control (using pressure reducing valves) to a multi-parameter control approach that considers economic priority, responsiveness, and plant conditions. This allows the system to optimize for both pressure regulation and economic productivity simultaneously by adjusting steam flow allocations based on composite criteria rather than pressure alone.
Data Source
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AI summary
[0065] There is described herein a method and system for dispatching a single steam flow command to multiple control elements by prioritizing control elements and measuring responsiveness and availability of the control elements using feedbacks. The dispatched single steam flow command may then be adjusted as a function of the responsiveness of each control element.