Organic Flash Cycle Power Generation
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Solution Overview
Problem
Current energy conversion technologies, such as the Rankine Cycle, face inefficiencies due to the use of 'wet' fluids like water, which result in moisture formation and damage to turbine blades, while organic fluids are more efficient but limited by temperature range and require complex heating processes.
Innovation Solution
The Organic Flash Cycle (OFC) utilizes organic working fluids that remain in a liquid phase during heat exchange, employing a throttling valve to produce vapor, which is then expanded in a turbine to generate power, with modifications like double flash and two-phase systems to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water or 'wet' fluids are used in the Rankine Cycle, then the system can operate at high temperatures, but moisture formation occurs during expansion which damages turbine blades
Solution Approach 1:
The patent changes the fundamental parameter of working fluid from water to organic fluids with different thermodynamic properties. Organic fluids maintain a 'dry' expansion process where the vapor quality remains high throughout the turbine expansion, eliminating moisture formation and protecting turbine blades while still allowing operation at elevated temperatures
Solution Approach 2:
The patent utilizes the phase transition characteristics of organic fluids differently than water. By selecting organic fluids with appropriate saturation curves, the expansion process occurs entirely in the vapor phase or with minimal condensation, avoiding the harmful wet steam conditions that damage turbine blades in conventional Rankine cycles
2Productivity
If organic fluids are used to improve thermal efficiency, then power generation efficiency increases, but the heating process becomes more complex and temperature range is limited
Solution Approach 1:
The patent changes the thermodynamic parameters of the cycle by using organic fluids with lower boiling points and different heat capacity characteristics. This allows efficient heat transfer at lower temperature differentials, simplifying the heat exchange process while maintaining high power generation efficiency
Solution Approach 2:
The patent introduces organic fluids as intermediary working substances that facilitate more efficient energy transfer between the heat source and turbine. These organic fluids act as mediators that can absorb and release heat more effectively than water, improving overall cycle efficiency without requiring complex heating infrastructure
3Device complexity
If conventional Rankine Cycle is used, then the system structure is simple, but thermal efficiency is limited due to phase change inefficiencies
Solution Approach 1:
The patent changes the working fluid parameters to organic substances with favorable thermodynamic properties for flash evaporation cycles. This enables higher thermal efficiency by reducing the irreversibilities associated with phase change while maintaining a relatively simple system structure similar to conventional Rankine cycles
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 OFC achieves more efficient heat transfer and power generation by eliminating phase change inefficiencies and utilizing organic fluids' 'dry' nature, leading to higher thermal efficiency and reduced exergy destruction, with potential for increased power output and reduced equipment costs.
Implementation Method 1
compressing an organic fluid with a pump
Implementation Method 2
heating the organic fluid by passing the organic fluid through a heat exchanger
Implementation Method 3
flash evaporating the organic fluid in a flash evaporator to generate an organic vapor
Implementation Method 4
driving a turbine with the organic vapor and lowering a pressure of the organic vapor
Implementation Method 5
reducing a pressure of the organic fluid in a liquid state after operation (c) to the lower pressure by passing the organic fluid through a throttling valve
Implementation Method 6
condensing the mixture to a liquid state of the organic fluid with a condenser
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to an Organic Flash Cycle (OFC). In one aspect, a modified OFC system includes a pump, a heat exchanger, a flash evaporator, a high pressure turbine, a throttling valve, a mixer, a low pressure turbine, and a condenser. The heat exchanger is coupled to an outlet of the pump. The flash evaporator is coupled to an outlet of the heat exchanger. The high pressure turbine is coupled to a vapor outlet of the flash evaporator. The throttling valve is coupled to a liquid outlet of the flash evaporator. The mixer is coupled to an outlet of the throttling valve and to an outlet of the high pressure turbine. The low pressure turbine is coupled to an outlet of the mixer. The condenser is coupled to an outlet of the low pressure turbine and to an inlet of the pump.