Cryogenic Vessel Heat Transfer Control for Vapor Pressure Regulation
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Solution Overview
Problem
Cryogenic liquid storage systems face safety hazards due to built-up vapor pressure, which existing relief systems can address but at the cost of reactant loss or high operational expenses, especially when using Joule-Thomson cryostats.
Innovation Solution
A vapor pressure regulation system that includes a temperature adjustment mechanism and a controller to monitor and adjust heat transfer based on vapor pressure within a vessel, maintaining it within predefined limits by switching between heating and cooling modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relief system is used to release vapor to decrease internal vapor pressure, then vapor pressure control is improved, but reactant loss increases and safety hazards occur
Solution Approach 1:
The system changes the temperature parameter of the cryogenic liquid by controlled heat transfer to regulate vapor pressure. By adjusting the temperature of the liquid phase, the equilibrium vapor pressure is modified according to the Clausius-Clapeyron relationship, allowing pressure control without vapor release
Solution Approach 2:
The system implements a feedback control mechanism where vapor pressure is continuously monitored and compared against target ranges. Based on the deviation from target pressure, heat transfer rate is adjusted dynamically to maintain pressure within acceptable limits, preventing both over-pressurization and reactant loss
2Reliability
If a Joule-Thomson cryostat is used to cool the cryogenic liquid storage system, then vapor pressure regulation is improved, but installation cost and operational power consumption increase
Solution Approach 1:
The invention extracts and utilizes the waste heat already present in the system environment or process streams to cool the cryogenic liquid. By taking advantage of available thermal energy sources rather than introducing active cooling systems, the need for high-power Joule-Thomson cryostats is eliminated
Solution Approach 2:
The system uses passive heat transfer mechanisms and available environmental heat sinks to self-regulate the temperature and vapor pressure of the cryogenic liquid. The design allows the system to serve its own cooling needs through controlled heat exchange with the surrounding environment, reducing dependency on external power-intensive cooling equipment
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
Effectively regulates vapor pressure within cryogenic storage vessels, enhancing safety by preventing excessive pressure buildup while minimizing reactant loss and reducing operational costs compared to traditional methods.
Implementation Method 1
A heat transfer between a temperature adjustment mechanism and the vessel is adjusted based on at least the vapor pressure within the vessel to facilitate regulating the vapor pressure within the vessel
Data Source
AI summary
A vapor pressure regulation system includes a vessel including a vessel wall that defines an enclosure, and a temperature adjustment mechanism coupled to the vessel. A heat transfer between the temperature adjustment mechanism and the vessel is adjusted based on at least a vapor pressure within the vessel to facilitate regulating the vapor pressure within the vessel.