Heating Appliance Startup Speed Monitoring for Blocked Condensate Drains
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Solution Overview
Problem
Existing methods for detecting a blocked condensate drain in heaters, particularly those using hydrogen as fuel, are complex, require structural modifications, and are not safe or effective, posing risks during startup due to undetected condensate accumulation.
Innovation Solution
A method involving starting the conveyor system at a target speed, recording its speed curve, and comparing it to a reference curve to detect a blocked condensate drain before fuel supply, ensuring safe ignition and preventing critical startup conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ionization current-based flame detection is used to detect blocked condensate drain, then detection capability is improved, but it cannot be used with hydrogen-powered heaters because hydrogen flame does not release sufficient electrical charge carriers
Solution Approach 1:
The patent replaces the electrical detection method (ionization current measurement) with a mechanical detection method (speed measurement of the conveyor system). The blocked condensate drain is detected by measuring changes in the speed curve of the conveyor system during startup, rather than by electrical charge carriers. This substitution enables detection capability that works with all fuel types including hydrogen.
2Reliability
If mechanical means such as condensate collection containers or switches in drain pipes are installed, then blocked drain detection is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent utilizes the self-service principle by leveraging the existing conveyor system's speed characteristics to detect blocked condensate drain. The conveyor system's own operational parameters (speed curve) are used for detection purposes, eliminating the need for separate mechanical detection devices. This approach maintains reliability while avoiding additional structural modifications and reducing device complexity.
3Measurement precision
If existing detection methods are implemented, then blocked drain detection is improved, but they require the heater to be started up which could cause damage if the drain is already blocked
Solution Approach 1:
The patent applies preliminary action by detecting a blocked condensate drain during the startup phase itself, before fuel is supplied and combustion begins. The speed curve measurement is performed on the conveyor system during its startup rotation, allowing detection of drain blockage before any harmful effects can occur. This enables early intervention to prevent damage while maintaining detection capability.
Data Source
Figure 1
Figure 2~3
AI summary
A method for starting up a heating appliance (1) is proposed. The appliance is designed to burn a mixture of combustion air and fuel gas, which is supplied to a burner (3) by means of a conveying device (2). The method comprises at least the following steps: a) starting up the conveying device (2) and accelerating to a starting speed (21), b) recording a speed profile (18, 20) of the conveying device (2) during the execution of step a), c) comparing the speed profile (18, 20) recorded in step b) with a reference profile (19), evaluating the speed profile (18, 20) recorded in step b), and detecting a blocked condensate drain (12). The method enables the detection of a blocked condensate drain (12) during the start-up process of a heating appliance (1).In addition, a computer program, a control and regulating device (7), a heating device (1) and the use of a recorded speed profile (18, 20) are proposed.