Anti-slugging Insert for Fluidized Bed Hydropyrolysis
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Solution Overview
Problem
Conventional pyrolysis of biomass results in highly oxygenated, chemically unstable liquid fuels with high acid content, making them difficult to transport and upgrade due to retrograde reactions, and existing hydropyrolysis processes require high hydrogen pressures and result in low deoxygenation efficiency, leading to economically unviable and inefficient fuel production.
Innovation Solution
A catalytic hydropyrolysis process using a deep fluidized bed reactor with large catalyst particles and an anti-slugging insert, where biomass is rapidly heated in the presence of molecular hydrogen, achieving deoxygenation and chemical stabilization of vapors to produce low-oxygen hydrocarbon fuels with properties similar to gasoline, kerosene, and diesel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pyrolysis is used to convert biomass into liquid products, then the process is simple and does not require catalysts or gaseous hydrogen, but the resulting liquid product is highly oxygenated, chemically unstable, and difficult to transport and upgrade
Solution Approach 1:
A fluidized bed reactor containing solid catalyst particles and molecular hydrogen serves as an intermediary system between biomass pyrolysis and final fuel product. The catalyst particles mediate deoxygenation reactions while hydrogen provides reducing conditions, transforming unstable pyrolysis vapors into stable hydrocarbon fuels with less than 4% oxygen content
Solution Approach 2:
The invention changes key process parameters by operating at moderate hydrogen partial pressures (6.9-41.4 bar) rather than extreme conditions, and by controlling temperature (315-450°C) to achieve optimal deoxygenation while maintaining fuel quality. These parameter changes enable stable fuel production without requiring excessively complex equipment
2Reliability
If attempts are made to react conventional pyrolysis liquids with hydrogen in the presence of solid catalysts to remove oxygen, then deoxygenation can be achieved, but the process requires very high hydrogen pressures of 138 bar or more and consumes significant hydrogen
Solution Approach 1:
The invention performs preliminary pyrolysis of biomass to generate vapors that are then directly subjected to catalytic deoxygenation in the fluidized bed. This preliminary action prevents the formation of stable oxygenated liquid intermediates that would require subsequent high-pressure hydrogenation, thereby reducing overall hydrogen consumption and operating pressure requirements
Solution Approach 2:
The invention operates at significantly lower hydrogen partial pressures (6.9-41.4 bar) compared to conventional hydroconversion processes (138 bar or more) by changing the process sequence - performing deoxygenation on vapors rather than on condensed liquids. This parameter change dramatically reduces both energy consumption and equipment complexity
3Reliability
If a deep fluidized bed reactor with large catalyst particles is used for catalytic hydropyrolysis, then deoxygenation efficiency improves and fuel stability increases, but the reactor is prone to slugging which causes catalyst attrition
Solution Approach 1:
An anti-slugging insert structure serves as an intermediary element within the fluidized bed reactor. This insert mediates between the deep bed configuration (which provides good deoxygenation) and slugging prevention, allowing the reactor to maintain deep bed operation while minimizing catalyst attrition through structural modification
Solution Approach 2:
The anti-slugging insert segments the fluidized bed into multiple zones, disrupting the formation of large slugs that cause catalyst attrition. By dividing the bed structure, the invention maintains the benefits of deep bed operation for deoxygenation while preventing the harmful slugging phenomenon
4Productivity
If barrier filters are used to separate char from hot pyrolysis vapors, then separation can be achieved, but the filters quickly experience irreversible clogging due to reactions of char and reactive vapors on the filter surface
Solution Approach 1:
The invention performs preliminary catalytic deoxygenation of pyrolysis vapors in the fluidized bed before they reach the separation stage. This preliminary action removes reactive oxygenated species that would otherwise cause clogging on filter surfaces, extending filter lifespan while maintaining separation efficiency
Solution Approach 2:
The invention converts the harmful reactive vapors into beneficial stable hydrocarbon products through catalytic deoxygenation. The reactive species that would cause filter clogging are transformed into stable fuels, turning a harmful factor into a benefit while solving the filter lifespan problem
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 effectively reduces oxygen content in hydrocarbon products to below 4% by mass, stabilizes the fuel, and avoids catalyst attrition, enabling efficient separation and production of high-quality liquid fuels with reduced hydrogen consumption and operational costs.
Implementation Method 1
heating the biomass as rapidly as possible
Implementation Method 2
converted into liquid products via rapid heating in the absence of oxygen (pyrolysis)
Implementation Method 3
catalytic hydropyrolysis process
Implementation Method 4
deoxygenation and chemical stabilization of vapors to produce low-oxygen hydrocarbon fuels
Implementation Method 5
A solid char product...is produced, along with condensable species
Implementation Method 6
deep fluidized bed reactor with large catalyst particles and an anti-slugging insert
Implementation Method 7
When the product vapor stream is cooled to ambient temperatures, a significant proportion of the hydrocarbons in the product vapor stream can be recovered as a liquid stream
Data Source
Figure 1~2B
Figure 3A~3B
Figure 4
AI summary
This invention relates to a process for thermochemically transforming biomass or other oxygenated feedstocks into high quality liquid hydrocarbon fuels. In particular, a catalytic hydropyrolysis reactor, containing a deep bed of fluidized catalyst particles is utilized to accept particles of biomass or other oxygenated feedstocks that are significantly smaller than the particles of catalyst in the fluidized bed. The reactor features an insert or other structure disposed within the reactor vessel that inhibits slugging of the bed and thereby minimizes attrition of the catalyst. Within the bed, the biomass feedstock is converted into a vapor-phase product, containing hydrocarbon molecules and other process vapors, and an entrained solid char product, which is separated from the vapor stream after the vapor stream has been exhausted from the top of the reactor. When the product vapor stream is cooled to ambient temperatures, a significant proportion of the hydrocarbons in the product vapor stream can be recovered as a liquid stream of hydrophobic hydrocarbons, with properties consistent with those of gasoline, kerosene, and diesel fuel. Separate streams of gasoline, kerosene, and diesel fuel may also be obtained, either via selective condensation of each type of fuel, or via later distillation of the combined hydrocarbon liquid.