Preheating Ambient Air Duct for Outdoor Wood-Fired Boiler Catalyst
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Solution Overview
Problem
Existing outdoor wood-fired boiler emission control systems face inefficiencies due to the lack of sufficient oxygen at ambient temperatures, which hampers the catalytic reaction process and requires additional heat to maintain reaction temperatures.
Innovation Solution
An emission control apparatus that introduces ambient oxygen to the catalyst-coated media at a higher temperature through an ambient air duct, utilizing a catalyst cleaner and initiator to heat the media and maintain efficient catalytic reactions, while also being designed for easy installation on existing or new outdoor wood-fired boilers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ambient air is introduced to provide oxygen for catalytic reactions, then emission control efficiency is improved, but the ambient air temperature is too low to sustain effective catalytic reactions and may remove heat from the catalyst
Solution Approach 1:
The patent introduces ambient air through a duct that pre-heats the air using heat from the exhaust stream before the air contacts the catalyst-coated media. This preliminary heating action ensures that the oxygen-rich air is at an elevated temperature when it enters the catalyst bed, enabling effective catalytic reactions without requiring additional external heat input.
Solution Approach 2:
The patent uses the exhaust stream as an intermediary heat transfer medium. The hot exhaust gases flow through a duct that surrounds or is in thermal contact with the ambient air intake duct, transferring thermal energy to the incoming ambient air. This intermediary heat transfer mechanism raises the temperature of the ambient air without directly heating the catalyst with the exhaust stream.
2Temperature
If additional heat is added to maintain catalyst temperature, then catalytic reaction temperature is improved, but energy consumption increases
Solution Approach 1:
The system uses the exhaust stream's thermal energy to pre-heat the ambient air intake, effectively using the waste heat from the exhaust to serve the dual purpose of providing oxygen-rich air to the catalyst while maintaining the catalyst temperature. This self-service approach eliminates the need for external heating energy input.
Solution Approach 2:
The patent changes the temperature parameter of the ambient air by pre-heating it using exhaust heat before it enters the catalyst bed. This parameter change ensures that the air is at an appropriate temperature for catalytic reactions, eliminating the need for additional energy input to maintain catalyst temperature.
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 solution significantly reduces particulate and species gas pollution, allowing for the use of outdoor wood-fired boilers in more locations, increases energy efficiency, and decreases dependency on foreign oil by ensuring effective catalytic conversion of pollutants into harmless compounds.
Implementation Method 1
catalyst-coated media which reduces the amount of air pollutants which would otherwise be emitted
Implementation Method 2
a catalyst cleaner and initiator disposed within said housing and near said media... which heats the catalyst-coated media
Implementation Method 3
exhaust flow path, catalyst-coated media disposed in the exhaust flow path
Implementation Method 4
an ambient air duct, the duct communicable with the ambient air inlet at a first end and the catalyst-coated media at a second end
Data Source
AI summary
An emission control apparatus which can be used on an outdoor wood-fired boiler. Ambient air, which has a much higher concentration of available oxygen in relation to exhaust gases, is caused to be heated before being passed through catalyst-coated media along with exhaust gases, thereby improving the performance of the catalytic reaction. An embodiment also relates to an emission control apparatus having a housing with an internal wall and an external wall, the internal wall defining an exhaust flow path and having a catalyst-coated media disposed therein, at least one ambient air duct disposed within the housing between the internal wall and the external wall, where each ambient air duct includes an air inlet in the external wall of the housing and an air outlet in the internal wall of the housing in communication with the catalyst-coated media, insulation disposed within the housing between the internal wall and the external wall, and wherein the at least one ambient air duct and insulation are positioned such that, during operation of the emission control apparatus, ambient air enters through the air inlet, travels upwardly through the air duct on a cool exterior side of the insulation before turning and traveling back down on a hot interior side of the insulation where the ambient air is heated from conduction through the internal wall of the housing before being introduced into the catalyst-coated media.