Adjustable Combustion Lance Flow Cross Section
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lances for combustion or flaring of exhaust gases struggle to maintain a consistent minimum flow speed, especially with strongly fluctuating exhaust gas volumes, leading to inadequate safety and compliance with safety regulations, often requiring additional gases like air or steam to achieve the necessary flow velocity.
Innovation Solution
A lance with an adjustable annular exhaust gas duct featuring coaxially mounted conical surfaces that can be axially displaced to vary the flow cross section, ensuring a constant minimum flow speed over a significant axial path, eliminating the need for additional gases and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flow cross section of the exhaust duct is made rigid, then the structure is simple, but the volume flow variation range is limited to 1:2 to 1:5 and minimum flow speed cannot be maintained with fluctuating exhaust gas volumes
Solution Approach 1:
The exhaust duct is transformed from a rigid structure to a dynamic one by introducing an adjustable flow cross-section mechanism. The duct can now adapt its geometry to match varying exhaust gas volumes, enabling a volume flow variation range exceeding 1:10 while maintaining structural integrity through controlled adjustability.
Solution Approach 2:
The flow cross-section parameter of the exhaust duct is made variable rather than fixed. By changing the geometric parameters (area, shape) of the duct cross-section in response to exhaust gas volume fluctuations, the system maintains optimal flow velocity and prevents harmful effects across a wide operating range.
2Reliability
If air, steam or nitrogen is added to the exhaust gas to maintain minimum volume flow, then the minimum flow speed is maintained, but the device complexity increases and additional substances are required
Solution Approach 1:
The solution extracts and eliminates the need for external gas addition systems by addressing the root cause - the rigid exhaust duct geometry. By removing the constraint of fixed duct dimensions and implementing adjustable geometry, the system inherently maintains minimum flow speed without requiring additional air, steam, or nitrogen injection infrastructure.
Solution Approach 2:
The exhaust duct system becomes self-regulating by automatically adjusting its flow cross-section in response to varying exhaust gas volumes. This self-adjustment capability allows the system to maintain minimum flow speed through its own geometric adaptation rather than relying on external substance addition.
3Reliability
If the flow cross section is adjusted to ensure minimum flow speed, then safety regulations are met, but the device complexity increases
Solution Approach 1:
The adjustable flow cross-section mechanism serves multiple functions simultaneously: it maintains minimum flow velocity for safety, adapts to varying exhaust gas volumes, and prevents harmful effects. This multi-functionality is achieved through a single integrated adjusting mechanism that controls the exhaust duct geometry, eliminating the need for separate systems for each function.
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 adjustable lance design significantly expands the operational range, ensuring minimum flow speed compliance across varying exhaust gas volumes, enhancing safety and reducing the need for supplementary gases, thereby improving re-ignition safety and meeting regulatory requirements.
Implementation Method 1
the conical lateral surface of which delimits the annular exhaust gas duct together with an associated further conical surface inside and outside, the conical surfaces overlapping each other in the minimum position
Data Source
Figure 1~2
AI summary
In a lance for the combustion or flaring of combustible exhaust gases, comprising an annular-shaped exhaust gas channel (5) connected to an outlet opening (10), wherein the exhaust gas channel (5) is equipped with adjusting means for adjusting the flow cross-section, the adjusting means comprise an adjusting body (2) adjustable in the axial direction of the lance between a minimum position for the smallest flow cross-section and a maximum position for the largest flow cross-section, the conical outer surface (11) of which, together with an associated further conical surface (9), delimits the annular exhaust gas channel (5) internally and externally, wherein the conical surfaces (9, 11) overlap each other in the minimum position.