Pressurizing device, carbon dioxide cycle plant, and combined cycle plant
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Solution Overview
Problem
Existing pressurizing devices require significant motive power to compress fluids efficiently, particularly in carbon dioxide cycle and combined cycle plants, due to limitations in reducing the equivalent diameter of flow paths and increasing heat transfer coefficients.
Innovation Solution
A non-positive displacement pressurizing device with a rotor and stationary blade rows, incorporating heat exchanging units that divide the flow path between adjacent stationary blades in the circumferential direction, reducing the cross-sectional area and enhancing heat transfer coefficients, thereby minimizing motive power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fins are provided on return vanes to cool the fluid, then heat exchange is improved, but the reduction effect on motive power is limited
Solution Approach 1:
The flow path between adjacent stationary blades is divided into multiple sub-flow paths by providing heat exchanging units (such as partitions or walls) that extend from the leading edge toward the trailing edge of the stationary blades. This segmentation increases the number of heat exchange interfaces and reduces the equivalent diameter of each sub-flow path, thereby enhancing the heat transfer coefficient and overall heat exchange efficiency, which leads to greater reduction in motive power required for compression.
2Temperature
If conventional heat exchange cooling is used, then some cooling effect is achieved, but isothermal compression is not sufficiently realized
Solution Approach 1:
The flow path is segmented into multiple narrow sub-flow paths by heat exchanging units, which increases the surface area to volume ratio and enhances heat transfer. This allows the compression process to approach isothermal conditions more closely, minimizing temperature rise and reducing energy loss during compression.
Solution Approach 2:
Heat exchanging units are extended in the circumferential direction along the stationary blades, adding a dimensional element to the heat exchange surface. This extension increases the heat transfer area without significantly increasing the axial length, enabling more effective cooling throughout the compression process and achieving near-isothermal compression.
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
The solution effectively reduces the motive power needed to pressurize fluids, achieving isothermal compression and enhancing the efficiency of carbon dioxide cycle and combined cycle plants by improving heat transfer and reducing aerodynamic losses.
Implementation Method 1
a plurality of heat exchanging units for cooling the fluid, wherein the heat exchanging units are configured to divide a flow path formed between stationary blades
Data Source
AI summary
A non-positive displacement type pressurizing device for pressurizing a fluid includes a rotor including a rotary blade row including a plurality of rotary blades provided at intervals in a circumferential direction; a casing that accommodates the rotor; a stationary blade row supported by the casing and including a plurality of stationary blades provided at intervals in the circumferential direction; and a plurality of heat exchanging units for cooling the fluid, wherein the heat exchanging units are configured to divide a flow path formed between stationary blades, of the plurality of stationary blades, adjacent to one another in the circumferential direction in a height direction of the stationary blades.