Heating device with improved efficiency
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Solution Overview
Problem
Existing heating devices for biomass combustion suffer from inefficiencies due to significant heat loss through exhaust gases, leading to suboptimal performance.
Innovation Solution
A heating device design featuring a double-walled combustion chamber, flue-gas duct, and heat exchangers that utilize a counter-current principle and preheat tertiary air to enhance heat capture and transfer, including a flat-tube flue-gas heat exchanger and radiant-heat exchanger to maximize energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-walled combustion chamber design is used, then device complexity is low, but heat loss through exhaust gases is high
Solution Approach 1:
The patent implements a double-walled combustion chamber where the inner combustion chamber is nested within an outer combustion chamber, creating a counter-flow heat exchanger structure. The flue gases flow through the annular space between the inner and outer walls, transferring heat to the incoming air while maintaining a compact integrated structure.
Solution Approach 2:
The patent introduces a flue-gas duct as an intermediary structure that channels hot flue gases through the annular space between the inner and outer combustion chamber walls. This intermediary enables efficient heat transfer from exhaust gases to incoming air, reducing heat loss while maintaining structural organization.
2Loss of energy
If multiple heat exchangers are added to improve heat capture, then energy efficiency increases, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple heat exchangers into an integrated double-walled combustion chamber structure. The counter-flow heat exchange between flue gases and incoming air occurs within the annular space of the double-walled chamber, combining combustion, heat exchange, and air preheating functions into a single unified structure.
Solution Approach 2:
The double-walled combustion chamber structure serves multiple functions simultaneously: it acts as the combustion chamber, a counter-flow heat exchanger, and an air preheating system. This multi-functionality reduces the need for separate components while improving overall heat capture efficiency.
3Object-generated harmful factors
If flue gases are released directly to environment, then device complexity is low, but pollutant concentration in exhaust is high
Solution Approach 1:
The patent applies preliminary action by preheating the incoming air through heat exchange with flue gases before combustion. This preheated air improves combustion efficiency and reduces pollutant formation, while the flue gases are then released with reduced temperature and lower pollutant concentration.
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 design achieves a significant increase in energy efficiency by capturing and transferring heat through multiple stages, reducing pollutant concentration, and minimizing heat loss, resulting in a highly efficient heating process.
Implementation Method 1
a flat-tube flue-gas heat exchanger
Implementation Method 2
heat exchangers that utilize a counter-current principle and preheat tertiary air to enhance heat capture and transfer
Implementation Method 3
flue-gas duct which leads the flue gas downwards along the combustion chamber
Implementation Method 4
a radiant-heat exchanger located above the combustion chamber
Implementation Method 5
double-walled, internally hollow combustion-chamber wall which has an upper opening leading above the combustion zone into the combustion chamber
Implementation Method 6
heat exchangers that utilize a counter-current principle and preheat tertiary air to enhance heat capture and transfer
Data Source
AI summary
A heating device, preferably for the combustion of biomass, in particular of pellets of biomass, in one aspect, includes a burner part and a heating part. The burner part includes a combustion chamber; a double-walled, internally hollow combustion-chamber wall, which has an upper opening leading above the combustion zone into the combustion chamber; a flue-gas duct which leads the flue gas downwards along the combustion chamber, wherein the flue-gas duct is followed by a heat-exchanger area including initially, a flat-tube flue-gas heat exchanger, then, a tertiary-air heat exchanger; a flue-gas ventilation stack, a radiant-heat exchanger located above the combustion chamber, a flue-gas flap at the upper end of the flue-gas duct, which, when open, connects the flue-gas duct to the stack. A flat-tube flue-gas heat exchanger of the heating part forms a heat-exchanger circuit with an exhaust-air heat exchanger with the same heat-transfer medium as the flat-tube flue-gas heat exchanger.