Biofuel Production via Two-Stage Pressurization and Heat Integration
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Solution Overview
Problem
Current biofuel production faces social, economic, environmental, and technical challenges, including the 'food vs fuel' debate, carbon emissions, deforestation, soil erosion, and inefficiencies in energy balance and resource utilization, necessitating an alternative source and process for biofuel production.
Innovation Solution
A system and process utilizing a two-stage pressurization and heat exchanger system to convert biomass, sludge, or wastewater into biofuel, involving pressurization up to 250 bar, heating to 400 °C, and subsequent separation to produce a high-conversion rate of biofuel, with heat integration and efficient energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional biofuel production methods are used, then biofuel can be produced from traditional sources, but environmental issues such as deforestation, soil erosion, and biodiversity loss occur
Solution Approach 1:
The patent changes the fundamental parameter of feedstock source from agricultural biomass to municipal solid waste, transforming the input material composition to eliminate environmental harm while maintaining biofuel production output
Solution Approach 2:
The patent converts harmful municipal solid waste into beneficial biofuel, transforming an environmental problem into a renewable energy solution that simultaneously reduces waste accumulation and provides clean energy
2Productivity
If single-stage pressurization is used, then the system is simpler, but the conversion efficiency and energy recovery are insufficient
Solution Approach 1:
The patent segments the pressurization process into two distinct stages with different pressure levels (first stage: lower pressure, second stage: higher pressure up to 250 bar), allowing optimized conversion efficiency while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent implements dynamic pressure adjustment through two-stage pressurization, enabling the system to adapt pressure levels to different processing requirements and maximize conversion efficiency at each stage
3Productivity
If high pressure and temperature are applied, then conversion rate increases, but energy consumption increases
Solution Approach 1:
The patent implements a heat exchanger system that captures thermal energy from the high-temperature output stream and feeds it back to preheat the incoming feedstock, creating a feedback loop that reduces external energy input while maintaining high conversion rates
Solution Approach 2:
The patent recovers thermal energy that would otherwise be discarded from the high-temperature process output, utilizing heat exchangers to capture and reuse this energy for preheating incoming material, thereby reducing overall energy consumption
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 process achieves a high conversion rate of starting materials to biofuel, utilizing inexpensive and readily available feedstocks, enhancing energy recovery and operational stability, while being environmentally friendly and cost-effective.
Implementation Method 1
a first heat exchanger (104) adapted for receiving the second pressurized feed from the high pressure pump (103) and pre-heating the second pressurized feed
Implementation Method 2
The reaction vessel (106) is adapted for receiving the heated feed from the second heat exchanger (105) and reforming the heated feed
Implementation Method 3
a precipitation vessel (107) adapted for receiving the slurry from the reaction vessel (106) and separating the solids (b) from the slurry
Implementation Method 4
a gas-liquid separator (111) adapted for receiving the gas-liquid mixture from the second pressure let-down station (110) and separating gases (111A) from the gas-liquid mixture
Implementation Method 5
a biofuel separator (112) adapted for receiving the mixture (111B) comprising biofuel and non-reformed feed, from the gas-liquid separator (111) and separating the non-reformed feed (112B) from the mixture to obtain the biofuel (112A)
Data Source
Figure 1
AI summary
The present disclosure relates to a system and a process for producing biofuel. The system comprises at least one feed tank; a low pressure pump; a high pressure pump; a first heat exchanger; a second heat exchanger; a reaction vessel; a precipitation vessel; a first pressure let-down station; a third heat exchanger; a second pressure let-down station; a gas-liquid separator; and a biofuel separator. The process comprises pressurizing and heating a feed, followed by reforming the pressurized and heated feed to obtain a slurry. The solids are separated from the slurry by precipitation to obtain a mixture comprising biofuel and the non- reformed feed. The mixture is then cooled and de-pressurized, followed by separation of 0 gases and the non-reformed feed to obtain the biofuel. The system and process of the present disclosure can be used to produce biofuel from diverse, easily available and inexpensive starting material.