Multi-Boiler Fan Pressure Control Against Exhaust Gas Backflow
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Solution Overview
Problem
In multiboilers, exhaust gas backflow into non-operational combustion chambers can occur, leading to insufficient oxygen supply and potential ignition issues, and existing mechanical dampers deteriorate over time, causing critical damage.
Innovation Solution
A control method using wind pressure sensors and controllers to adjust fan operation in non-operational boilers to prevent backflow, where a master controller calculates and communicates average wind pressure or RPM to slave controllers to set appropriate fan operation for non-operational units, eliminating the need for mechanical dampers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical dampers are installed to prevent exhaust gas backflow, then backflow prevention is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical dampers with a control system comprising wind pressure sensors and controllers that electronically regulate fan operation. The wind pressure sensor detects exhaust gas pressure, and the controller adjusts fan speed accordingly to prevent backflow, eliminating moving mechanical parts while achieving the same protective function.
Solution Approach 2:
The system uses the existing fan infrastructure and adds sensing/control capabilities to make the fans self-regulating. The wind pressure sensor continuously monitors conditions and the controller automatically adjusts fan operation to maintain proper exhaust flow, making the system self-adjusting without external mechanical intervention.
2Reliability
If mechanical dampers are used to prevent exhaust gas backflow, then backflow prevention is improved, but maintenance costs and breakdown risks increase over time
Solution Approach 1:
The patent replaces mechanical dampers with a control system comprising wind pressure sensors and controllers that electronically regulate fan operation. The wind pressure sensor detects exhaust gas pressure, and the controller adjusts fan speed accordingly to prevent backflow, eliminating moving mechanical parts while achieving the same protective function.
Solution Approach 2:
The electronic control system components (sensors and controllers) are simpler and more reliable than mechanical dampers, with no moving parts to wear out. Even if electronic components fail, they are easier and cheaper to replace compared to mechanical damper assemblies, reducing long-term maintenance costs.
3Productivity
If multiple boilers are operated to meet desired heating capacity, then energy efficiency is improved, but exhaust gas backflow into non-operational combustion chambers occurs
Solution Approach 1:
The system uses wind pressure sensors to continuously monitor exhaust gas pressure in each boiler's combustion chamber. When exhaust gas pressure indicates potential backflow conditions, the controller receives feedback and adjusts the fan speed to maintain proper negative pressure, preventing exhaust gas from flowing into adjacent non-operational combustion chambers.
Solution Approach 2:
The communication line acts as an intermediary between controllers, allowing the operating boiler's controller to detect when adjacent boilers are non-operational and adjust fan operation accordingly to prevent exhaust gas from flowing into the idle combustion chambers through the shared exhaust system.
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
Effectively prevents exhaust gas backflow without mechanical dampers, reducing maintenance costs and breakdown risks, while maintaining efficient operation and energy savings.
Implementation Method 1
a wind pressure sensor measuring wind pressure of air flowing into a combustion chamber
Implementation Method 2
a controller controlling the number of revolutions of a fan supplying air into the combustion chamber
Data Source
AI summary
The present invention relates to a control method of preventing backflow of exhaust gas into combustion chambers of boilers or water heaters that are not in operation for a multiboiler comprising a plurality of boilers or water heaters connected in line, each of which including a wind pressure sensor measuring wind pressure of air flowing into a combustion chamber and a controller controlling a fan supplying air into the combustion chamber on the basis of the wind pressure measured by the wind pressure sensor. The control method includes measuring wind pressures using the wind pressure sensors in the operating boilers and calculating an average wind pressure, using any controller as a master controller to determine a control amount of wind of the fans of non-operational boilers based on the average wind pressure, and operating the fans of the non-operational boilers on the basis of the control amount of wind.