Organic Rankine Cycle Gas Temperature Control for Power Generation
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Solution Overview
Problem
Existing organic Rankine cycle (ORC) generators lack systems to maintain the temperature of a gas flow at a specified range, leading to volatile condensation and equipment damage or inefficiency.
Innovation Solution
Implementing a bypass valve and flow control mechanisms to adjust the gas flow through heat exchangers, ensuring the gas temperature remains within an operating range by diverting or adjusting the working fluid flow based on temperature sensors and bypass valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If heat transfer from gas flow to working fluid is increased to generate electrical power, then power generation is improved, but gas temperature drops below threshold causing volatile condensation
Solution Approach 1:
The system divides the gas flow into two separate paths: a first flow path that passes through the heat exchanger for heat transfer, and a second bypass flow path that circumvents the heat exchanger. This segmentation allows independent control of temperature reduction (first path) while maintaining overall gas temperature (second path), resolving the contradiction between maximizing heat transfer for power generation and maintaining gas temperature above condensation threshold
Solution Approach 2:
A bypass valve is introduced as an intermediary control device to regulate the mixing ratio between the cooled gas (from first heat exchanger) and the uncooled gas (from bypass path). The bypass valve mediates the temperature control by adjusting the proportion of gas flowing through each path, ensuring the combined gas temperature remains above the volatile condensation threshold while still enabling sufficient heat transfer for power generation
2Productivity
If gas temperature is reduced below compressor performance threshold to improve heat transfer, then power generation efficiency is improved, but compressor performance deteriorates
Solution Approach 1:
The system dynamically adjusts the gas flow distribution between the heat exchanger path and bypass path based on real-time temperature measurements. The bypass valve and flow control mechanisms continuously modulate the proportion of gas flowing through each path, enabling the system to adapt to varying operating conditions and maintain optimal balance between heat transfer efficiency and compressor performance
Solution Approach 2:
Temperature sensors monitor the gas temperature at multiple points (inlet to heat exchanger, outlet from heat exchanger, and mixed gas temperature), providing feedback to the control system. This feedback enables automatic adjustment of the bypass valve and flow control mechanisms to maintain gas temperature within the optimal range for both heat transfer efficiency and compressor performance
3Reliability
If bypass valve and flow control mechanisms are added to maintain gas temperature, then temperature control reliability is improved, but device complexity increases
Solution Approach 1:
The bypass valve and flow control mechanisms serve multiple functions simultaneously: they control gas flow distribution, regulate temperature, and optimize heat transfer efficiency. By making these components multi-functional, the system achieves reliable temperature control without proportionally increasing complexity, as the same components perform multiple tasks within the existing ORC framework
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
Maintains gas temperature within a specified range, preventing volatile condensation and ensuring efficient compressor operation while generating electrical power.
Implementation Method 1
heat transfer to a working fluid... transfer of heat from the flow of gas to a working fluid
Implementation Method 2
the heat from the heat source causes the working fluid in the loop to change phases from a liquid to a vapor
Implementation Method 3
The vaporous working fluid may then flow to a gas expander, causing the gas expander to rotate
Implementation Method 4
The rotation of the gas expander may cause a generator to generate electrical power
Implementation Method 5
The vaporous working fluid may then flow to a condenser or heat sink... causing the working fluid to change phase from the vapor to the liquid
Data Source
AI summary
Systems and generating power in an organic Rankine cycle (ORC) operation to supply electrical power. In embodiments, an inlet temperature of a flow of gas from a source to an ORC unit may be determined. The source may connect to a main pipeline. The main pipeline may connect to a supply pipeline. The supply pipeline may connect to the ORC unit thereby to allow gas to flow from the source to the ORC unit. Heat from the flow of gas may cause the ORC unit to generate electrical power. The outlet temperature of the flow of the gas from the ORC unit to a return pipe may be determined. A flow of working fluid may be adjusted to a percentage sufficient to maintain temperature of the flow of compressed gas within the selected operating temperature range.