Biomass Fuel Plant Drying Control via Bulk Density
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Solution Overview
Problem
The moisture content of wood biomass affects the quality of the carbonized product in biomass fuel production, requiring stable control to achieve consistent quality, which is not adequately addressed by adjusting the heating gas supply alone.
Innovation Solution
A biomass fuel production plant with a drying heat source, drying device, carbonized product production device, bulk density measurement, and control device that adjusts the heat quantity based on the Lower Heating Value (LHV) of the carbonized product, using a correlation between LHV and bulk density to optimize moisture content for stable carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of heating gas supplied to the pyrolysis furnace is adjusted to control moisture content, then the carbonized product quality can be partially improved, but the quality stability is insufficient
Solution Approach 1:
The patent applies preliminary action by implementing a drying process before pyrolysis to pre-control the moisture content of wood biomass. The drying device heats and dries the wood biomass to a predetermined moisture content range (5-20%) before carbonization, ensuring that the material enters the pyrolysis stage with optimized moisture levels. This preliminary moisture control establishes a stable foundation for subsequent carbonization, enabling consistent carbonized product quality without relying solely on adjustments during the pyrolysis heating gas supply.
2Power
If high temperature carbonization is performed to improve gasification rate, then the heating value is improved, but the treatment time must be sufficiently long to suppress spontaneous exothermicity
Solution Approach 1:
The patent applies parameter changes by systematically optimizing multiple process parameters: drying temperature (50-150°C), drying time (1-24 hours), pyrolysis temperature (300-700°C), and pyrolysis holding time (1-10 hours). By establishing specific parameter ranges and their interrelationships, the patent achieves high gasification rates while controlling treatment time. The predetermined moisture content range (5-20%) serves as a critical parameter that enables efficient carbonization without excessive treatment time or spontaneous exothermicity.
3Stability of the object's composition
If half carbonization is performed to maintain crushability and heat quantity, then the temperature range must be controlled very narrowly
Solution Approach 1:
The patent applies preliminary action by implementing a drying process before pyrolysis to pre-control the moisture content of wood biomass. The drying device heats and dries the wood biomass to a predetermined moisture content range (5-20%) before carbonization, ensuring that the material enters the pyrolysis stage with optimized moisture levels. This preliminary moisture control establishes a stable foundation for subsequent carbonization, enabling consistent carbonized product quality without relying solely on adjustments during the pyrolysis heating gas supply.
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 configuration ensures the production of carbonized products with stable quality by adjusting the heat quantity supplied to the wood biomass, optimizing the moisture content for efficient carbonization, resulting in a carbonized product with improved combustion performance.
Implementation Method 1
a drying device configured to use the heat medium supplied from the drying heat source to heat and dry wood biomass
Implementation Method 2
a carbonized product production device configured to perform pyrolysis of the dried wood biomass to produce a carbonized product
Data Source
AI summary
A biomass fuel production plant includes: a drying heat source that generates a heat medium; a drying device that uses the heat medium supplied from the drying heat source to heat and dry wood biomass; a carbonized product production device that is configured to perform pyrolysis of the dried wood biomass to produce a carbonized product; a bulk density measurement device that measures a bulk density of the carbonized product discharged from the carbonized product production device; and a control device that controls a heat quantity of the heat medium supplied to the wood biomass in the drying device. The control device includes an LHV calculation unit that is configured to calculate the LHV of the carbonized product from the bulk density, and controls the heat quantity of the heat medium supplied to the wood biomass in the drying device on the basis of the calculated LHV.