Exhaust Gas Nozzle With Replaceable Insert For Heat Resistance
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Solution Overview
Problem
Existing nozzles for introducing and metering treatment media in combustion processes are prone to heat and corrosion stress in the combustion chamber, making them unreliable and difficult to maintain due to complex designs and clogging issues.
Innovation Solution
A nozzle design featuring a cooled cover element and an exchangeable inner displacement body, where the treatment medium enters perpendicularly to the carrier medium, allowing for improved heat resistance and easy maintenance by shortening damaged parts, and a detachable connection for extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle head is exposed to the combustion chamber environment, then the treatment medium can be introduced and atomized, but the nozzle head is subjected to strong heat and corrosion stress
Solution Approach 1:
The nozzle is divided into separate components: a casing element and an insert element that can be independently removed and replaced. This segmentation allows the insert element to be exchanged when worn by heat and corrosion, without replacing the entire nozzle assembly, thereby maintaining reliability while reducing exposure to harmful factors through selective replacement.
Solution Approach 2:
The insert element is designed as a replaceable component that can be easily exchanged when worn. This approach treats the insert as a consumable part that protects the more valuable casing element, allowing quick replacement rather than repairing or replacing the entire nozzle system.
2Manufacturing precision
If the nozzle is designed as a single-component nozzle with a specially matched nozzle outlet opening, then atomization can be achieved, but the nozzle clogs more easily and cannot be easily cut off at its front end
Solution Approach 1:
The nozzle is segmented into a casing element and an insert element containing the nozzle outlet opening. This allows the insert to be separately replaced if clogged or damaged, maintaining the precision of the original design while enabling easy repair by simply exchanging the insert rather than the entire nozzle.
Solution Approach 2:
The insert element is designed to be replaceable when worn or clogged. Instead of attempting to repair the entire nozzle assembly, the worn insert can be discarded and replaced with a new one, maintaining precision output while simplifying maintenance operations.
3Duration of action of stationary object
If the cover element is cooled from the inside by the mixture of carrier medium and treatment medium, then it can withstand strong heat effects for longer, but the service life is extended requiring more complex cooling arrangement
Solution Approach 1:
The cooling of the cover element is achieved using the process fluids themselves (carrier medium and treatment medium) that are already flowing through the nozzle for its primary function. The system cools itself by utilizing its own operating fluids, extending service life without requiring external cooling systems or additional 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
The nozzle effectively withstands high heat, simplifies maintenance by allowing easy replacement of damaged parts, and ensures consistent mixing and impulse delivery through adjustable mixing section lengths, enhancing operational reliability and longevity.
Implementation Method 1
the treatment medium enters the mixing chamber transversely, preferably perpendicularly, to the direction of flow of the carrier medium
Implementation Method 2
the cover element is cooled from the inside by the mixture of carrier medium and treatment medium
Implementation Method 3
the displacement body protrudes beyond the casing element, since a favorable impulse effect can thereby be exerted on the immediate core area in front of the nozzle
Data Source
AI summary
The nozzle has an outer casing element (2) and an inner displacement body (1) to form a nozzle gap (14). The displacement body borders a mixing chamber (18) inside the casing element, and has a tapered area (3) in a transitional area between the mixing chamber and the nozzle gap. The mixing chamber communicates with a pressure chamber (6.1) for carrier medium. The feed element (5) supplies treatment medium (9) that enters into the mixing chamber. An independent claim is also included for a method for operating a nozzle.