Variable Geometry Inlet Guide Vanes for Turboexpander Pressure Control
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Solution Overview
Problem
Conventional power generation systems using Rankine cycles face challenges in efficiently regulating system pressure and optimizing power output efficiency, particularly in turboexpanders with multiple expansion stages, which can lead to difficulties in controlling fluid flow and maximizing power generation.
Innovation Solution
A system and method involving a turboexpander with at least two expansion stages, where a controller adjusts the angle of the first inlet guide vane to maintain a predetermined inlet pressure and independently adjusts the angle of the second inlet guide vane to maximize power output, allowing for optimized power generation by regulating the expansion ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional single-stage turboexpanders are used, then the system structure is simple, but the ability to regulate system pressure and optimize power output efficiency is limited
Solution Approach 1:
The turboexpander is divided into multiple expansion stages with separate inlet guide vanes for each stage. This segmentation allows independent control of each stage's flow and pressure, enabling precise regulation of system pressure and optimization of power output efficiency that cannot be achieved with a single-stage design.
Solution Approach 2:
The patent employs variable geometry inlet guide vanes that can be dynamically adjusted to different angles. This dynamic capability allows the system to adapt to varying operating conditions and load requirements, optimizing power output efficiency across different operating points while maintaining the ability to regulate system pressure.
2Productivity
If multiple expansion stages with independent control are implemented, then power output efficiency is optimized, but the device complexity increases
Solution Approach 1:
By segmenting the control into separate inlet guide vanes for each expansion stage, the system achieves independent control of each stage. This segmentation enables precise regulation of pressure and flow at each stage, optimizing power generation while distributing the control complexity across manageable stages rather than requiring a single complex control mechanism.
Solution Approach 2:
The patent utilizes variable geometry inlet guide vanes that can change their angular position to regulate flow parameters. By changing the geometric parameters (angles) of the inlet guide vanes, the system optimizes pressure and flow characteristics at each stage, maximizing power output efficiency through parameter adjustment rather than complex mechanical control systems.
3Stress or pressure
If additional control valves are used to regulate pressure, then system pressure control is improved, but the device complexity and potential failure points increase
Solution Approach 1:
The patent merges the pressure regulation function with the inlet guide vanes of the expansion stages. By making the inlet guide vanes variable geometry and controllable, the system integrates pressure regulation directly into the expansion process rather than requiring separate control valves. This merging eliminates additional components while maintaining effective pressure control.
Solution Approach 2:
The inlet guide vanes are designed to be self-regulating through their variable geometry capability. The system can automatically adjust the vanes' positions to maintain desired pressure levels without requiring external control valves. This self-service approach allows the expansion stages to regulate their own pressure and flow characteristics, eliminating the need for additional control components.
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 approach enables the turboexpander to operate within an upper pressure range, optimizing power output efficiency and reducing the need for additional control valves, while maintaining stable system pressure and maximizing power generation, especially under varying load conditions.
Implementation Method 1
The turboexpander 4 receives the pressurized vapor stream 14 and can generate power 16 as the pressurized vapor expands
Implementation Method 2
Rankine cycles use a working fluid in a closed-cycle to gather heat from a heating source or a hot reservoir and to generate a hot gaseous stream that expands through a turbine to generate power
Implementation Method 3
a controller configured to control (i) an angle of a first inlet guide vane provided at an inlet of a first expansion stage of the turboexpander for maintaining an inlet pressure of the first expansion stage in a predetermined range
Implementation Method 4
an external heat source 10, e.g., hot flue gases, heats the heat exchanger 2. This causes the received pressurized liquid medium 12 to turn into a pressurized vapor 14
Implementation Method 5
The expanded lower pressure vapor stream 18 released by the turboexpander 4 enters the condenser 6, which condenses the expanded lower pressure vapor stream 18 into a lower pressure liquid stream 20
Data Source
AI summary
A method and system for power generation including a turboexpander with at least two expansion stages, the turboexpander being connected to a power generation unit, is provided. The system includes a controller configured to control (i) an angle of a first inlet guide vane provided at an inlet of a first expansion stage of the turboexpander for maintaining an inlet pressure of the first expansion stage in a predetermined range, and (ii) an angle of a second inlet guide vane provided at an inlet of a second expansion stage of the turboexpander. The controller is configured to determine a highest power from determined powers of the power generation unit and a corresponding angle of the second inlet guide vane and to adjust the angle of the second inlet guide vane independent of the angle of the first inlet guide vane to achieve the highest power.