Black Pellet Granulation Moisture Control
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Solution Overview
Problem
Existing processes for producing black granules from steam-cracked lignocellulosic biomass face issues with incomplete granulation, low apparent density, and mechanical defects due to inadequate humidity control, leading to increased production costs and reduced mechanical resistance.
Innovation Solution
The process involves granulating steam-cracked biomass at a humidity level of 12-20%, with optional humidification before granulation and drying after if necessary, to achieve a moisture content of ≤10% in the final granules, optimizing humidity management and reducing the need for post-granulation drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the steam-cracked powder is granulated at lower humidity (5-8%) to limit the negative effect of humidity on energy capacity, then the PCI/raw is improved, but the granulation becomes incomplete with defects such as rough spots, incomplete formation, and reduced apparent density
Solution Approach 1:
The invention applies preliminary humidification to the steam-cracked powder before granulation to ensure the material has sufficient moisture content (10-27%) for complete and high-quality granulation. This preliminary action prevents granulation defects while maintaining energy capacity, as the added moisture is later removed to achieve the desired final humidity level.
Solution Approach 2:
The invention changes the humidity parameter dynamically: first increasing it to 10-27% during granulation to ensure complete formation and high apparent density, then reducing it to ≤10% in the final product to maintain energy capacity. This parameter change resolves the contradiction between granulation quality and energy content.
2Manufacturing precision
If the steam-cracked powder is granulated at higher humidity (10-27%) to improve granulation quality and apparent density, then the manufacturing precision is improved, but the energy capacity (PCI/raw) is reduced due to increased residual moisture
Solution Approach 1:
The invention applies preliminary humidification to the steam-cracked powder before granulation to ensure the material has sufficient moisture content (10-27%) for complete and high-quality granulation. This preliminary action prevents granulation defects while maintaining energy capacity, as the added moisture is later removed to achieve the desired final humidity level.
Solution Approach 2:
The invention changes the humidity parameter dynamically: first increasing it to 10-27% during granulation to ensure complete formation and high apparent density, then reducing it to ≤10% in the final product to maintain energy capacity. This parameter change resolves the contradiction between granulation quality and energy content.
3Manufacturing precision
If additives (starch, flours, or minerals) are added to improve granulation quality, then the manufacturing precision is improved, but the production cost increases and combustion efficiency is reduced
Solution Approach 1:
The invention uses the steam-cracked biomass itself as the binding agent for granulation by controlling its moisture content (10-27%). This self-service approach eliminates the need for external additives like starch or minerals, thereby reducing production costs and maintaining combustion efficiency while achieving complete and high-quality granulation.
4Volume of stationary object
If the steam-cracked powder is granulated at higher humidity (10-27%), then the apparent density is improved (650-750 g/L), but the drying energy consumption increases
Solution Approach 1:
The invention applies preliminary humidification to the steam-cracked powder before granulation to ensure the material has sufficient moisture content (10-27%) for complete and high-quality granulation. This preliminary action prevents granulation defects while maintaining energy capacity, as the added moisture is later removed to achieve the desired final humidity level.
Solution Approach 2:
The invention changes the humidity parameter dynamically: first increasing it to 10-27% during granulation to ensure complete formation and high apparent density, then reducing it to ≤10% in the final product to maintain energy capacity. This parameter change resolves the contradiction between granulation quality and energy content.
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 results in higher-quality black pellets with improved mechanical resistance, hydrophobicity, and longer shelf life, while reducing energy consumption and production costs by minimizing the need for pre-drying steps.
Implementation Method 1
carrying out humidification before the granulation treatment if the humidity level of said steam-cracked biomass is lower than a threshold value of between 12% and 20%
Implementation Method 2
carrying out, after granulation, drying, if the humidity in the granules is higher than 10%, in order to reduce the humidity of the granules to a level lower than or equal to 10%
Implementation Method 3
The thermal treatment of biomass by steam cracking allows this densification of energy, by homogenizing the biomass into a steam cracked powder according to precise parametric conditions
Data Source
AI summary
The invention relates to the field of solid biofuels obtained by the steam cracking of a lignocellulosic biomass. More particularly, it relates to a method for producing black pellets in which granulation is carried out at a humidity of between 12 and 20%.