Biomass Hopper Screening and Heating for Boiler-Ready Wood Chips
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Solution Overview
Problem
High-moisture wood chips are unsuitable for smaller residential boiler systems due to oversize and excessive moisture content, which can clog systems and prevent efficient combustion, and preprocessing to reduce moisture is time-consuming and inefficient.
Innovation Solution
A biomass delivery system incorporating a vehicle chassis, material hopper assembly, biomass unloading system, screening assembly, grinding assembly, and hopper heating assembly to process and size biomass material, ensuring proper sizing and reduced moisture content for efficient combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If green wood chips are transported directly to residential boilers, then transportation time is reduced, but the chips have excessive moisture content (38-55%) that prevents efficient combustion
Solution Approach 1:
The system performs preliminary drying action by transporting wood chips in a heated vehicle that maintains temperatures above the dew point to prevent condensation, and includes an on-board drying system that can reduce moisture content before the chips reach the residential boiler, thus eliminating the need for post-transport drying while ensuring combustion readiness
2Reliability
If green wood chips are preprocessed to reduce moisture content, then combustion efficiency is improved, but the preprocessing time becomes excessively long
Solution Approach 1:
The system changes the temperature parameter during transport by maintaining the vehicle interior temperature above the dew point (typically 50-100°F above ambient), which prevents moisture condensation and actually reduces moisture content through evaporation, transforming the transport process from a neutral or harmful operation into an active drying process that achieves combustion-ready moisture levels in the transport time itself
3Device complexity
If oversized wood chips are delivered to residential boilers, then preprocessing operations are simplified, but the chips clog the smaller boiler feed systems
Solution Approach 1:
The system performs preliminary sizing action by equipping the transport vehicle with an on-board grinder that reduces oversized wood chips to appropriate sizes during or before discharge, ensuring that only properly sized chips are delivered to the residential boiler feed system, thus eliminating clogging issues while maintaining simple preprocessing operations at the boiler site
4Reliability
If wood chips are dried to reduce moisture content, then combustion efficiency is improved, but the drying process becomes time-consuming
Solution Approach 1:
The system implements continuous useful action by performing the drying process continuously during the entire transport duration through heated air circulation and dehumidification systems that operate throughout the journey, rather than performing batch drying after transport, thus converting idle transport time into productive drying time and achieving moisture reduction without extending total process time
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
The system effectively processes high-moisture biomass into properly sized and dried material for efficient combustion in smaller boiler systems, reducing clogging risks and preprocessing time.
Implementation Method 1
a hopper heating assembly configured to warm the biomass material within the material hopper assembly. The hopper heating assembly may be configured to be energized with engine waste heat.
Implementation Method 2
a screening assembly configured to receive biomass material from the biomass unloading system and filter the biomass material to pass properly-sized biomass material while removing oversize biomass material. The screening assembly may include a vibrating screening assembly.
Data Source
AI summary
A biomass delivery system includes: a vehicle chassis assembly; a cab assembly coupled to the vehicle chassis assembly; a material hopper assembly coupled to the vehicle chassis assembly and configured to receive biomass material; a biomass unloading system configured to remove the biomass material from the delivery hopper assembly; and a screening assembly configured to receive biomass material from the biomass unloading system and filter the biomass material to pass properly-sized biomass material while removing oversize biomass material.