Adjustable Throughflow Element for Premixing Combustion Device
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Solution Overview
Problem
Conventional premixing combustion devices for heating boilers face challenges in reliable starting, leading to increased pollutant discharge and potential failures due to abrupt ignition and pressure surges during the starting phase.
Innovation Solution
A throughflow reduction device with an adjustable throughflow reduction element is placed between the blower outlet and the burner cylinder, allowing for regulation of the combustion mixture's pressure and flow speed by varying the blower outlet opening, ensuring a smoother ignition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air fraction is reduced or fuel fraction is increased during the starting phase to enable reliable ignition, then the combustion mixture can be reliably ignited, but the discharge of pollutants increases
Solution Approach 1:
The invention applies dynamics by making the blower outlet opening adjustable rather than fixed. The throughflow reduction element can be positioned to either open or reduce the outlet opening size, allowing the system to dynamically adapt the flow characteristics during different operational phases (starting vs. normal operation) to achieve both reliable ignition and reduced pollutant discharge
Solution Approach 2:
The invention changes the physical parameters of the blower outlet opening (cross-sectional area) to control the combustion mixture flow. By adjusting the outlet opening size, the system modifies the flow speed and pressure of the combustion mixture, enabling reliable ignition during starting phase while maintaining lower pollutant discharge compared to conventional fixed-opening systems
2Reliability
If the combustion mixture flows into the combustion zone abruptly during the starting phase to achieve ignition, then ignition is achieved, but pressure surges and pulsations occur in the combustion chamber
Solution Approach 1:
The throughflow reduction element provides dynamic control over the blower outlet opening, allowing the system to adjust the flow rate of combustion mixture entering the combustion zone. This dynamic adjustment prevents abrupt flow transitions that cause pressure surges and pulsations, while still enabling reliable ignition
Solution Approach 2:
The invention applies beforehand cushioning by using the throughflow reduction element to pre-regulate the combustion mixture flow before it enters the combustion zone. This pre-regulation cushions the transition during starting phase, preventing pressure surges and pulsations that would otherwise occur with abrupt flow into the combustion zone
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 enables reliable ignition and prevents pulsations during the starting phase, maintaining stable operation even under adverse conditions, by adjusting the blower outlet opening to achieve higher pressure and lower flow speed, thus ensuring a 'softer' start and reducing the risk of device failures.
Implementation Method 1
the pressure and the speed of the combustion mixture flowing to the burner cylinder be regulated or controlled by varying the cross section of the outlet opening of the blower
Data Source
AI summary
In a premixing combustion device (1) for a heating boiler, comprising a blower (2) which delivers a combustion mixture composed of fuel and air from an outlet opening (8) of the blower (2) via a burner cylinder (9) to a combustion zone, wherein a mixing device (3) arranged upstream of the blower (2) prepares the combustion mixture, it is sought to provide a solution which, in a structurally simple manner, ensures reliable starting of the heating boiler and prevents failures. This is achieved by means of a throughflow reduction device (10) which is arranged between the outlet opening (8) of the blower (2) and the burner cylinder (9) and which has a throughflow reduction element (13) which can be adjusted between a position in which it opens the outlet opening (8) of the blower (2) and a position in which it reduces the size of the outlet opening (8) of the blower (2).