System and method for boiler control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current boiler control systems operate inefficiently due to conservative margins to avoid carbon monoxide violations, leading to reduced efficiency and increased emissions, despite being designed for safety and emission regulations.
Innovation Solution
A system and method for boiler control that uses a carbon monoxide sensor to issue main and pulse servo commands to adjust combustion material supply units, optimizing air-fuel ratios to minimize CO emissions while maintaining operational safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative margins are built into boiler systems to avoid CO violations, then safety and operational robustness are improved, but efficiency deteriorates
Solution Approach 1:
The system continuously monitors exhaust CO levels and uses this feedback to dynamically adjust the air-fuel ratio. The controller receives real-time CO measurements and modifies combustion parameters accordingly, replacing static conservative margins with dynamic, measurement-based control that maintains safety while optimizing efficiency.
Solution Approach 2:
The invention transitions from static conservative operating margins to dynamic control that continuously adapts to actual combustion conditions. The air-fuel ratio is adjusted in real-time based on CO measurements, allowing the system to operate at optimal efficiency points while maintaining safety through active control rather than fixed conservative settings.
2Device complexity
If CO is not measured and conservative margins are used, then system complexity is reduced, but efficiency deteriorates
Solution Approach 1:
By introducing CO measurement and feedback control, the system gains the ability to optimize efficiency without excessive complexity. The feedback mechanism provides direct information about combustion quality, enabling precise adjustments to the air-fuel ratio that improve efficiency while keeping the control logic relatively simple and direct.
Solution Approach 2:
The invention replaces mechanical conservative margins (fixed, overly cautious settings) with a sensor-based control system that uses electrical/electronic measurement and control signals. This substitution allows for more precise and efficient operation while maintaining acceptable system complexity through modern sensing and control technology.
3Loss of energy
If air-fuel mixture is leaned out to improve efficiency, then efficiency is improved, but CO emissions increase and safety deteriorates
Solution Approach 1:
The system uses CO measurements as feedback to control the air-fuel ratio. When the mixture is leaned out to improve efficiency, the CO sensor detects increased CO levels and signals the controller to enrich the mixture, preventing excessive CO emissions. This closed-loop control allows the system to operate near the optimal efficiency point while automatically correcting to maintain safety limits.
Solution Approach 2:
The invention dynamically changes the air-fuel ratio parameter based on real-time CO measurements. The system can lean out the mixture to improve efficiency when CO levels are acceptable, then enrich it when CO approaches harmful levels. This dynamic parameter adjustment allows the system to optimize efficiency while maintaining safety, unlike fixed conservative settings that permanently reduce efficiency.
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 system dynamically adjusts combustion parameters to achieve improved efficiency and reduced CO emissions by temporarily leaning out the air-fuel mixture, thereby enhancing operational robustness and compliance with emission regulations.
Implementation Method 1
a carbon monoxide (CO) sensor disposed at an outlet of the vessel to sense a quantity of exhaust CO output from the vessel as a product of combustion therein
Implementation Method 2
supply units (20, 21) configured to provide supplies of combustion materials for combustion thereof to an interior (31) of the vessel (30), coupled to the supply units, in which combustion of the combustion materials occurs
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system for boiler control is provided. The system includes supply units to provide supplies of combustion materials for combustion thereof, a vessel coupled to the supply units in which the combustion materials are combusted, a carbon monoxide (CO) sensor disposed at an outlet of the vessel to sense a quantity of exhaust CO output from the vessel as a product of combustion therein and a control unit. The control unit is coupled to the supply units and the sensor and configured to issue a main servo command and a pulse servo command to one or more of the supply units to control operations of the one or more supply units in accordance with the sensed quantity of the exhaust CO.