Biomass Hydrothermal Decomposition Apparatus Temperature Control
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Solution Overview
Problem
Conventional biomass hydrothermal decomposition apparatuses experience excessive decomposition of hemicellulose, leading to reduced yield and inhibition of fermentation processes due to temperature distribution issues, which affects the efficiency of producing organic raw materials like ethanol from cellulose resources.
Innovation Solution
A biomass hydrothermal decomposition apparatus with a temperature control method that maintains a predetermined temperature for a specific time and includes a temperature drop region to prevent excessive decomposition, where hot water is fed from one side and biomass from the other, with a temperature range of 180° C. to 240° C. for hydrothermal decomposition and a drop to 140° C. or less to prevent excessive hemicellulose decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot water is fed at high temperature (180°C to 240°C) for hydrothermal decomposition, then decomposition efficiency is improved, but excessive decomposition of hemicellulose occurs reducing C5 sugar yield
Solution Approach 1:
The apparatus divides the reaction zone into multiple temperature zones: a high-temperature zone (180-240°C) for effective hydrothermal decomposition and a low-temperature zone (140°C or less) for preventing excessive decomposition. This spatial segmentation allows simultaneous achievement of high decomposition efficiency and C5 sugar preservation.
Solution Approach 2:
Different regions of the apparatus body are assigned different temperature characteristics: the region where hydrothermal decomposition occurs maintains high temperature for efficiency, while the region where hemicellulose dissolution occurs maintains low temperature to prevent excessive decomposition. This local quality differentiation resolves the contradiction between decomposition efficiency and sugar yield.
2Productivity
If temperature is maintained at high level for extended period, then decomposition is more complete, but fermentation inhibitors are generated
Solution Approach 1:
The apparatus rapidly transitions the reaction mixture from high temperature to low temperature after the decomposition phase, skipping the extended high-temperature period that would generate fermentation inhibitors. This time-compression approach maintains decomposition completeness while avoiding harmful byproducts.
Solution Approach 2:
The low-temperature region is prepared in advance as a protective zone that immediately receives the reaction mixture after high-temperature decomposition, preventing the formation of fermentation inhibitors before they can be generated.
3Use of energy by moving object
If counter contact flow is used for heat exchange, then heat efficiency is improved, but temperature distribution occurs causing uneven decomposition
Solution Approach 1:
The apparatus accepts the temperature distribution inherent in counter contact flow but assigns different functional qualities to different temperature regions: high temperature zones perform decomposition while low temperature zones prevent excessive decomposition. This functional differentiation transforms the temperature non-uniformity from a defect into a useful feature.
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 effectively suppresses excessive decomposition of hemicellulose, enhancing the yield of C5 sugar and preventing fermentation inhibitors, thereby improving the efficiency of organic raw material production.
Implementation Method 1
feeds hot water from the other side to hydrothermally decompose the biomass material while bringing the biomass material into counter contact with the hot water in the apparatus body
Implementation Method 2
a temperature drop region in which a temperature is rapidly dropped to a temperature at which hot-water soluble fractions are not excessively decomposed, immediately after it is out the effective reaction region
Implementation Method 3
dissolves hot-water soluble fractions in hot water
Data Source
AI summary
A biomass hydrothermal decomposition apparatus that feeds a solid biomass material 11 from one side of an apparatus body 42, feeds hot water 15 from the other side, to hydrothermally decompose the biomass material 11 while bringing the biomass material 11 into counter contact with the hot water 15, dissolves hot-water soluble fractions in hot water, discharges the hot water to outside from the one side of the apparatus body 42 as a hot-water effluent 16, and discharges a biomass solid (a hot water insoluble) 17 to outside from the other side. The biomass hydrothermal decomposition apparatus includes an effective reaction region A formed from the other side to the one side of the apparatus body 42, in which a feeding temperature of the hot water 15 (for example, 200° C.) is maintained for a predetermined period of time to cause hydrothermal decomposition, and a temperature drop region B in which a temperature is rapidly dropped to a temperature (for example, 140° C.) at which the hot-water soluble fractions are not excessively decomposed (for example, from 200° C. to 140° C.), immediately after it is out of the effective reaction region A.