Rankine-cycle power apparatus bypass control
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Solution Overview
Problem
Conventional Rankine-cycle power-generating apparatuses face challenges in reducing size and improving reliability, particularly during system abnormalities like power failures, where maintaining operation and safe shutdown are compromised due to excessive electric power consumption and heat generation.
Innovation Solution
Incorporating a bypass flow channel with an adjustable opening/closing device and a control system that adjusts the degree of opening to manage direct-current electric power absorption, ensuring it falls within a predetermined range, thereby optimizing power usage and reducing the apparatus's size while enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the apparatus operates during power failure without power limitation, then continued operation is maintained, but electric power consumption becomes excessive and heat generation increases
Solution Approach 1:
The control device changes the operational parameters of the Rankine-cycle device during power failure by adjusting the opening degree of the bypass flow channel. This regulates the flow rate of the working fluid, thereby controlling the electric power consumption and heat generation to remain within safe limits while maintaining continued operation.
Solution Approach 2:
The bypass flow channel acts as an intermediary mechanism that allows partial flow of the working fluid to bypass the expander. By controlling the opening degree of the bypass, the system can regulate the amount of work performed and thus control the electric power output and heat generation during power failure conditions.
2Volume of stationary object
If the apparatus size is reduced, then compactness is improved, but the electric power absorber and control systems require more space
Solution Approach 1:
The control device performs multiple functions: it controls the opening degree of the bypass flow channel, regulates electric power consumption, manages heat generation, and ensures safe operation during power failures. By consolidating these functions into a single control device, the patent reduces the overall apparatus size while maintaining the necessary control capabilities.
Solution Approach 2:
The patent combines the bypass flow channel control mechanism with the electric power absorption and heat management functions into an integrated system. The opening/closing device for the bypass flow channel is controlled in conjunction with the electric power absorber, merging multiple control functions into a coordinated system that reduces spatial requirements.
3Use of energy by moving object
If the bypass flow channel is fully opened to reduce power consumption, then electric power absorption decreases, but the apparatus can no longer maintain safe operation
Solution Approach 1:
The control device dynamically adjusts the opening degree of the bypass flow channel based on real-time operational conditions during power failure. Rather than maintaining a fixed fully-opened position, the system continuously modulates the bypass opening to maintain electric power consumption and heat generation within safe operational limits, ensuring both reduced power usage and maintained reliability.
Solution Approach 2:
The control device monitors the operational status of the Rankine-cycle device during power failure and uses feedback to adjust the bypass flow channel opening degree. This feedback mechanism ensures that electric power consumption is reduced while maintaining safe operation by preventing excessive heat generation and ensuring stable continued operation.
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 allows for efficient operation and safe shutdown of the Rankine-cycle device during power failures by adjusting electric power absorption, ensuring continued operation and reducing the apparatus's size while improving reliability.
Implementation Method 1
an expander that converts expansion energy of a working fluid into mechanical energy
Implementation Method 2
a power generator that is linked to the expander
Implementation Method 3
a converter that converts alternating-current electric power generated by the power generator into direct-current electric power
Data Source
Figure 1
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AI summary
Specific operation is executable in a Rankine-cycle power-generating apparatus. In the Rankine-cycle power-generating apparatus, a) in the specific operation, the control device adjusts the degree of opening of the opening/closing device so that the direct-current electric power absorbed by the electric power absorber approaches first electric power, or b) in the specific operation, the degree of opening of the opening/closing device is increased to the predetermined intermediate degree of opening so that the direct-current electric power absorbed by the electric power absorber falls within a predetermined range.