Biomass Hydrothermal Carbonization Steam Injection Heat Exchange
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Solution Overview
Problem
Current hydrothermal carbonization methods for biomass face challenges such as high energy requirements, sedimentation issues, limited reactor volume due to residence time, and high viscosity of biomass, leading to increased equipment sizes and maintenance costs.
Innovation Solution
The method involves injecting steam into the biomass treatment line at a higher pressure and speed to reduce viscosity and enhance heat exchange, eliminating the need for additional heating in the treatment station and mixer-scraper, thereby optimizing heat transfer and reducing equipment size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the reactor provides energy to increase the temperature of the biomass, then the biomass can be carbonized, but the energy consumption increases and the residence time requires stirring and mixer-scraper installation
Solution Approach 1:
The system recovers thermal energy from the carbonized biomass output and uses it to preheat the incoming biomass feed. This self-service heat recovery system reduces external energy input requirements while maintaining the necessary temperature for carbonization.
Solution Approach 2:
The biomass is preheated using recovered thermal energy before entering the carbonization reactor. This preliminary heating action reduces the energy burden on the reactor and shortens the required residence time.
2Duration of action of moving object
If the residence time is increased to ensure uniform heating, then the biomass is thoroughly carbonized, but the reactor volume must be increased
Solution Approach 1:
The biomass undergoes preheating in a separate heat exchange system before entering the carbonization reactor. This preliminary thermal preparation reduces the time needed for uniform heating during carbonization, allowing for a more compact reactor volume.
3Stability of the object's composition
If the temperature gradient between the heating surface and biomass is reduced, then sedimentation is minimized, but the heat exchange efficiency decreases
Solution Approach 1:
The system replaces mechanical stirring with a thermal convection-based heat exchange system. The biomass is heated through controlled thermal gradients that induce natural convection currents, maintaining uniformity without mechanical intervention.
4Loss of energy
If the viscosity of the biomass is reduced by additives, then the heat exchange improves, but additional chemicals and processing steps are required
Solution Approach 1:
The system utilizes the inherent thermal properties of the carbonized biomass output to preheat the incoming feed. This self-service approach improves heat exchange efficiency without requiring external additives or additional chemical processing steps.
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 reduces energy consumption, minimizes sedimentation, and allows for a more efficient and cost-effective treatment process by improving heat exchange ratios and eliminating the need for scraping and mixing operations, enabling a smaller reactor volume and reduced maintenance costs.
Implementation Method 1
steam is injected into the line between the pressure pump and the heating means. This injection makes it possible to heat the biomass by condensation of the steam.
Implementation Method 2
This injection makes it possible to heat the biomass by condensation of the steam
Implementation Method 3
Such a method helps to reduce the viscosity of the biomass upstream of the heating means compared to a method that does not include such a steam injection
Data Source
AI summary
Disclosed is a method for heating a biomass moving along an industrial treatment line including an inlet (91) for the incoming biomass, a pressure pump (93), a heating unit (94) and a treatment station (95). According to an embodiment, steam is injected into the line between the pressure pump (93) and the heating unit (94) such as to pre-heat the biomass by condensing the steam.