Hydrothermal Carbonisation With Real-Time Gas-Rate Control
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Solution Overview
Problem
Current methods for monitoring and regulating hydrothermal carbonisation (HTC) reactions are not capable of providing real-time feedback, leading to inefficiencies in optimizing dehydration processes due to delayed and inaccurate measurements, such as pH analysis, which affects the quality and productivity of biochar production.
Innovation Solution
A method that determines the emitted gas production rate during the HTC reaction, comparing it to a setpoint value, and adjusts parameters like temperature, reagent amount, and residence time to achieve real-time regulation of the reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pH analysis is used to monitor HTC reaction progress, then the reaction can be tracked, but the measurement is delayed by 2-3 hours and provides insufficient real-time feedback
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring gas production rate and using this information to adjust reaction parameters in real-time. The gas production rate serves as an immediate indicator of reaction progress, allowing operators to modify temperature, pressure, or residence time to maintain optimal conditions without waiting for delayed pH measurements.
Solution Approach 2:
The patent replaces the chemical measurement approach (pH analysis) with a physical measurement approach (gas production rate monitoring). By measuring the rate of gas evolution, which occurs continuously and can be detected immediately, the system eliminates the time delay inherent in chemical analysis while providing equivalent or superior information about reaction progress.
2Manufacturing precision
If thermal drying methods are used to achieve high dry matter content, then dehydration can be achieved, but the process is very energy intensive
Solution Approach 1:
The patent changes the fundamental parameters of the dehydration process by using hydrothermal carbonisation instead of thermal drying. This involves conducting the reaction at elevated temperatures (100-200°C) and pressures (1-10 MPa) in an autoclave, transforming the biomass chemically before dehydration. This parameter change enables achieving 60-70% dry matter content with significantly lower energy consumption compared to conventional thermal drying.
Solution Approach 2:
The patent introduces an intermediary step of hydrothermal carbonisation that occurs before the final dehydration step. This intermediary process modifies the biomass structure to make it more susceptible to dehydration, acting as a mediator between the raw biomass and the final dehydrated product. This intermediary step enables more efficient dehydration and reduces the energy required for the overall process.
3Use of energy by moving object
If mechanical dehydration alone is used, then energy consumption is low, but the dry matter content cannot exceed 35-40%
Solution Approach 1:
The patent segments the dehydration process into two distinct stages: first, hydrothermal carbonisation to transform and concentrate the organic matter, and second, mechanical dehydration to remove water. This segmentation allows each stage to be optimized independently, with the first stage preparing the biomass for efficient dehydration in the second stage, thereby achieving high dry matter content with low energy consumption.
Solution Approach 2:
The patent performs preliminary action through hydrothermal carbonisation before mechanical dehydration. This preliminary treatment modifies the biomass structure, concentrates carbon atoms, and increases hydrophobicity, making the subsequent mechanical dehydration much more effective. Without this preliminary action, mechanical dehydration alone cannot achieve the desired dry matter content.
4Ease of operation
If HTC reaction settings are recorded, then the process can be controlled, but the dehydration result is only noticeable several hours after the reactor
Solution Approach 1:
The patent establishes a feedback loop where gas production rate measurements provide immediate information about reaction progress. This real-time feedback allows operators to adjust reaction settings while the reaction is ongoing, and the effects of these adjustments become visible through continuous gas evolution monitoring, eliminating the several-hour delay in observing dehydration results.
Solution Approach 2:
The patent substitutes delayed chemical analysis (pH measurement after cooling) with immediate physical measurement (gas production rate during reaction). The gas production rate can be measured continuously during the reaction process, providing real-time feedback about dehydration progress without waiting for the reaction to complete or for samples to be processed, thereby eliminating the time delay in result visibility.
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
Enables real-time monitoring and adjustment of HTC reaction conditions, improving the efficiency and productivity of biochar production by ensuring consistent dryness and reducing latency in process optimization.
Implementation Method 1
Hydrothermal carbonisation, a well-known reaction under the acronym HTC is a natural reaction that takes place deep in the earth under pressure at high temperatures. It results in the production of coal and gas from biomass.
Implementation Method 2
The thermal conditioning, of which the core of the method is the HTC reaction, is carried out at a high temperature—between 175° C. and 260° C.—and generally in an autoclave under pressure
Implementation Method 3
The slightly exothermic reaction is accelerated by the addition of a catalyst, for example by virtue of the presence of either an acid (for example citric or sulphuric or acetic acid) or a base (for example caustic soda).
Implementation Method 4
the biomass very easily releases its water by mechanical dehydration and is transformed into biochar
Implementation Method 5
This significant increase in the hydrophobicity of the organic matter makes it easier to dehydrate in a subsequent step, for example mechanical pressing or centrifuging.
Data Source
AI summary
The invention relates to a method for hydrothermal carbonisation of biomass containing organic matter, the method comprising: —injecting the biomass, a heat transfer fluid and a reagent into a reactor (1), —circulating a mixture consisting of the biomass, the heat transfer fluid and the reagent under specific pressure and temperature conditions for transforming the organic matter by hydrothermal carbonisation. The invention consists in: 1) determining the production rate of the emitted gas Te during the hydrothermal carbonisation reaction; 2) comparing the determined production rate of the emitted gas Te with a predefined value for the set gas production rate Tc, and 3) adjusting at least one of the reaction control parameters chosen from among the temperature within the reactor (1), the quantity of injected reactant, and the residence time in the reactor in order to adjust the production rate of the emitted gas Te, such that the value of said production rate of the emitted gas Te tends to be equal to the value of the set gas production rate Tc. The invention is applicable to treatment of biomass containing organic matter.