Boiler and the method for controlling combustion of the boiler
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Solution Overview
Problem
Gas boilers face efficiency issues due to exhaust flue clogging, which reduces combustibility and gas supply, as existing methods fail to effectively sense and adjust for clogging in real-time.
Innovation Solution
A combustion control method using an air blower, gas valve, and controller to measure rotational speed and pneumatic pressure differences, calculating an estimated flue clogging value to adjust the gas supply, maintaining combustibility by interpolating data from predefined databases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exhaust flue clogging phenomenon occurs, then the pressure inside the combustion chamber is increased and gas supply amount is reduced, but the efficiency of the boiler is lowered and combustibility is reduced
Solution Approach 1:
The patent implements a feedback control system where the rotational speed of the air blower is continuously monitored and compared against a reference value. Based on the deviation detected by the processor, the controller automatically adjusts the gas supply valve opening degree to maintain optimal combustion conditions, creating a closed-loop feedback mechanism that resolves the contradiction between maintaining combustibility and efficiency
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically detecting flue clogging conditions through blower speed monitoring and autonomously adjusting the gas supply without external intervention. The processor calculates the deviation and the controller executes the adjustment, enabling the boiler to self-correct combustion issues and maintain optimal performance
2Reliability
If a method of sensing clogging degree and adjusting gas supply is implemented, then combustibility is maintained, but device complexity increases
Solution Approach 1:
The patent uses the air blower's rotational speed as an intermediary parameter to indirectly sense flue clogging conditions. Instead of directly measuring clogging degree, the system monitors the blower speed deviation caused by backpressure from clogging, which serves as a mediator to detect the clogging state and trigger appropriate gas supply adjustments
Solution Approach 2:
The air blower serves multiple functions: it provides necessary air supply for combustion and simultaneously acts as a sensing element for detecting flue clogging conditions through its rotational speed. This multi-functionality eliminates the need for separate sensing devices, maintaining combustibility reliability while minimizing additional device complexity
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
Enables real-time determination of exhaust flue clogging, optimizing gas supply and maintaining combustibility, while using inexpensive equipment to enhance boiler efficiency.
Implementation Method 1
a change in pneumatic pressure which is a pressure of air introduced by rotation of the air blower
Implementation Method 2
measuring a change in rotational speed of the air blower according to a target heat value and a change in pneumatic pressure
Implementation Method 3
controlling an opening amount of the gas valve according to the estimated flue clogging value to control a supply amount of gas
Implementation Method 4
Gas boilers using heat generated by combustion of gas
Data Source
AI summary
The present invention relates to a boiler which determines a clogging degree of an exhaust flue through which combustion gas is discharged and adjusts gas supply amount to maintain its combustibility, and a combustion control method thereof, the method of the present invention including a) setting a target heat value for achieving a target temperature, b) applying a first database on the basis of the target heat value, c) measuring a rotational speed of an air blower and a pneumatic pressure of air introduced by rotation of the air blow, d) applying a second database on the basis of a rotational speed difference, a pneumatic pressure difference, and the target heat value to calculate an estimated flue clogging value according to the target heat value, and a) applying a third database according to the estimated flue clogging value to calculate an opening amount of a gas valve and control gas supply amount.