Hydrothermal Liquefaction System Staged Pressurization
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Solution Overview
Problem
Existing hydrothermal liquefaction (HTL) systems face challenges in efficiently pressurizing and heating biomass slurries due to high viscosity, requiring robust and expensive equipment that suffers from poor thermal efficiency and high pressure drops.
Innovation Solution
The system pressurizes and heats biomass slurry in multiple discrete steps, adjusting for viscosity changes, using multiple pumps and heat exchangers configured for specific temperature, pressure, and viscosity ranges, reducing the capital cost and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust equipment is used to pressurize and heat high viscosity biomass slurry, then the system can handle the viscous feedstock, but the capital cost increases and thermal efficiency decreases
Solution Approach 1:
The patent divides the single-step pressurization and heating process into multiple discrete steps. The slurry is pressurized in stages (e.g., first to an intermediate pressure, then to final pressure) and heated in stages (e.g., first to an intermediate temperature, then to final temperature). This segmentation allows each pump and heat exchanger to be sized for lower, more efficient operating conditions rather than requiring oversized equipment capable of handling the full viscosity range in one step.
Solution Approach 2:
The patent changes the physical parameters (pressure and temperature) in discrete steps rather than in a single operation. By incrementally increasing pressure and temperature, the slurry viscosity is progressively reduced, allowing subsequent equipment to operate more efficiently. This staged parameter change enables the use of smaller, less expensive equipment while maintaining the ability to process high-viscosity biomass slurry.
2Reliability
If robust equipment is used to pressurize and heat high viscosity biomass slurry, then the system can handle the viscous feedstock, but thermal efficiency decreases due to high pressure drops
Solution Approach 1:
The patent segments the pressurization and heating into multiple steps, with each step using equipment sized for the specific viscosity conditions at that stage. This prevents the excessive pressure drops that would occur in a single-step process using oversized equipment, as each heat exchanger operates at more optimal pressure and temperature conditions for heat transfer efficiency.
Solution Approach 2:
By changing pressure and temperature parameters in staged increments, the patent maintains the biomass slurry in a state where viscosity is progressively reduced. This allows each subsequent heat exchanger to operate with lower pressure drops and better thermal efficiency, as the slurry becomes easier to pump and heat with each stage.
3Device complexity
If single-step pressurization and heating is used, then the system is simpler, but it cannot efficiently handle viscosity changes during the process
Solution Approach 1:
The patent uses multiple pumps and heat exchangers arranged in series, with each unit optimized for specific operating conditions. This segmentation allows the system to adapt to changing slurry viscosity as pressure and temperature increase, maintaining efficient pumping and heat transfer throughout the process rather than using a single oversized unit that operates inefficiently across all conditions.
Solution Approach 2:
While the system has multiple components, each pump and heat exchanger is designed for a specific operating range, allowing the overall system to handle the full range of viscosity conditions through coordinated operation of specialized units rather than requiring one universal piece of 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
This approach reduces capital costs by 75% and improves thermal efficiency, allowing for the use of less material in pumps and heat exchangers, and enhances pumping and heat transfer efficiency.
Implementation Method 1
a first heat exchanger in fluid communication with the first pump and configured to heat a biomass slurry stream received from the first pump at the first pressure to a first temperature
Implementation Method 2
a second heat exchanger in fluid communication with the second pump and configured to heat a biomass slurry stream received from the second pump at the second pressure to a second temperature that is higher than the first temperature
Implementation Method 3
a third heat exchanger configured to receive the product mixture stream from the HTL reactor to heat a heat transfer liquid
Data Source
Figure 1
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AI summary
A hydrothermal liquefaction (HTL) system can include a biomass slurry source, a first pump in fluid communication with the slurry source and configured to pressurize a biomass slurry stream from the slurry source to a first pressure, a first heat exchanger in fluid communication with the first pump and configured to heat a slurry stream received from the first pump to a first temperature, a second pump in fluid communication with the first heat exchanger and configured to pressurize a slurry stream received from the first heat exchanger to a second pressure higher than the first pressure, a second heat exchanger in fluid communication with the second pump and configured to heat a slurry stream received from the second pump to a second temperature higher than the first temperature, and a HTL reactor configured to produce biocrude from a slurry stream received from the second heat exchanger.