Biomass Torrefaction Temperature Control via Infrared Thermometry
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Solution Overview
Problem
Current methods for measuring and controlling torrefaction temperature in biomass torrefaction processes provide false indications, as they rely on gas temperature or reactor surface temperature measurements, which do not accurately represent the biomass material temperature, varying by lignocellulosic material type.
Innovation Solution
Monitoring the surface temperature of biomass using an infrared thermometer, comparing it to a reference value, and adjusting heating, cooling, or residence time based on the measured value to maintain precise control of the torrefaction process, with the use of a purge gas to remove IR-active gases and prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas temperature or reactor surface temperature is measured to control torrefaction process, then temperature monitoring is simple, but the measurement accuracy is poor and does not reflect actual biomass temperature
Solution Approach 1:
The patent introduces an infrared-transparent window as an intermediary between the infrared thermometer and the biomass material. This window allows infrared radiation to pass through while enabling the thermometer to be positioned outside the reactor, thus achieving accurate biomass temperature measurement without direct contact and minimal system complexity
Solution Approach 2:
The patent replaces mechanical contact-based temperature measurement methods (such as thermocouples that would require insertion into the biomass) with non-contact infrared thermometry. This substitution eliminates mechanical wear, contamination risks, and complex installation requirements while providing accurate temperature readings
2Measurement precision
If infrared thermometer is used to measure biomass surface temperature, then temperature measurement accuracy improves, but IR-active gases and condensation interfere with measurement
Solution Approach 1:
The patent uses an infrared-transparent window as a physical barrier that blocks IR-active gases and condensation from reaching the thermometer while allowing infrared radiation to pass through. This intermediary protects the measurement system from harmful atmospheric interference
Solution Approach 2:
The patent creates a protected measurement environment by positioning the infrared thermometer behind an infrared-transparent window, effectively creating an inert zone free from IR-active gases and condensation that would otherwise interfere with the measurement
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 method allows for accurate monitoring and control of torrefaction temperature, ensuring the production of torrefied material with desired characteristics by directly measuring biomass surface temperature, thereby improving the quality and properties of the torrefied product.
Implementation Method 1
the surface temperature of the biomass in the torrefaction arrangement is determined
Implementation Method 2
a purge gas outlet is arranged at the IR thermometer such that purge gas may be supplied to the space between a lens of the IR thermometer and the material
Data Source
AI summary
The invention relates to a method and an arrangement for precise monitoring and control of torrefaction temperature, which enables accurate control of the quality and properties of the torrefied material. The method includes determining the surface temperature of the biomass in the torrefaction arrangement is using an IR-thermometer and hot nitrogen gas a purge gas.