L-Shaped Nested-Pipe Combustion Device for Fireplace Emissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Open-hearth fireplaces experience incomplete combustion due to insufficient temperatures, leading to toxic emissions, while closed-hearth fireplaces achieve complete combustion but may still have residual pollutants.
Innovation Solution
A device integrated into the fireplace that performs a double combustion by injecting secondary air heated to temperatures above 573°C through a system of nested pipes, ensuring complete burning of noxious effluents from the primary combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If open-hearth fireplace is used, then ease of operation is improved, but combustion temperature is insufficient leading to incomplete combustion and toxic emissions
Solution Approach 1:
The combustion process is segmented into two distinct stages: primary combustion in the open hearth and secondary combustion in the inserted device. The nested pipe structure divides the gas flow path into multiple channels, allowing separate temperature zones for each combustion stage, thus enabling complete combustion while maintaining operational simplicity
Solution Approach 2:
The device employs a nested pipe structure where multiple pipes are arranged concentrically within each other. This nesting allows hot gases to flow through inner pipes while outer pipes provide structural support and additional flow paths, maximizing heat exchange efficiency within a compact volume and enabling complete combustion without increasing device footprint
2Object-generated harmful factors
If closed-hearth fireplace is used, then combustion temperature is increased for complete combustion, but device complexity increases
Solution Approach 1:
The inserted device serves multiple functions simultaneously: it acts as a secondary combustion chamber, a heat exchanger, and a pollutant treatment device. The nested pipes perform dual roles as flow channels and heat transfer surfaces, reducing the need for additional components and simplifying the overall system while achieving complete combustion
Solution Approach 2:
The device utilizes the heat from primary combustion gases to preheat secondary air and maintain combustion temperatures without external energy input. The nested pipe structure enables self-sustaining heat exchange where hot gases automatically transfer thermal energy to incoming air streams, eliminating the need for additional heating mechanisms
3Productivity
If double combustion is implemented, then combustion efficiency is improved, but device complexity increases
Solution Approach 1:
The device merges the secondary combustion chamber, heat exchanger, and air injection system into a single integrated nested pipe assembly. Multiple combustion zones are combined within the same structural framework, allowing efficient double combustion while minimizing the number of separate components and simplifying installation
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 device effectively burns residual pollutants from the primary combustion, significantly reducing pollution and improving combustion efficiency in both open and closed-hearth fireplaces.
Implementation Method 1
a duct runs through all throughout the volume of the first and second pipes
Implementation Method 2
the combustion of wood generates a significant quantity of pollution emission... Incomplete combustions thus occur
Data Source
AI summary
The invention relates to a device approximately defining an L shape and comprising at least two first nested pipes in the foot of the L (32), and at least one second pipe (36) provided with at least one opening (38), in the leg of the L, the first pipes being arranged in such a way as to define a duct between one end (34) of a first central pipe and said at least one opening (38) by means of passages defined at the ends of the first pipes.