Combustion Gas Extraction Probe Uniform Cooling Design
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Solution Overview
Problem
Conventional combustion gas extraction probes face issues with metal fitting burnout, uneven cooling distribution, and difficulty in maintaining a small outer diameter to accommodate increased chlorine removal demands in cement kiln systems.
Innovation Solution
The probe design features low-temperature gas flowing perpendicular to and towards the center of high-temperature gas flow, with strategically arranged discharge holes to ensure efficient and uniform cooling, preventing burnout and allowing a smaller probe diameter, and includes a blaster for removing blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooling air is supplied to protect the probe head from high temperature, then the probe head is protected from burnout, but the metal fitting at the head still burns out due to insufficient cooling distribution
Solution Approach 1:
The probe head cooling system is segmented into multiple air jet holes distributed across the head surface, dividing the cooling function into multiple localized outlets. This segmentation allows cooling air to be delivered to different regions of the probe head simultaneously, improving both protection reliability and distribution uniformity.
Solution Approach 2:
Different regions of the probe head are provided with air jet holes of different orientations and positions, creating local quality variations. The air jet holes are arranged to direct cooling air toward specific high-temperature zones, ensuring that each local area receives appropriate cooling based on its thermal conditions.
2Reliability
If the probe diameter is increased to improve cooling capacity, then more cooling air can be supplied, but the probe cannot be installed at the entrance hood due to space constraints
Solution Approach 1:
The invention changes the parameters of the cooling air delivery system by varying the number, position, and orientation of air jet holes rather than increasing probe diameter. This allows optimization of cooling capacity within the constrained volume, maintaining reliability while keeping the probe compact for installation at the entrance hood.
3Productivity
If rapid cooling is carried out to condense volatile components, then chlorine removal efficiency is improved, but the probe metal burns out due to excessive thermal stress
Solution Approach 1:
Cooling air acts as an intermediary substance that transfers thermal energy from the probe head to the surrounding environment. The air jet holes deliver this intermediary cooling medium directly to the probe head surface, enabling rapid cooling of the exhaust gas while simultaneously protecting the probe metal from thermal damage through the mediating cooling air layer.
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 design extends the probe's lifespan, ensures uniform cooling of kiln exhaust gas, and maintains a small outer diameter while enhancing chlorine bypass system performance by maintaining high cooling rates and collecting high-concentration dust effectively.
Implementation Method 1
a combustion gas extraction probe for extracting a high-temperature combustion gas while cooling the high-temperature combustion gas with a low-temperature gas
Implementation Method 2
the low-temperature gas is made to flow in a direction that is substantially perpendicular to a sucking direction of the high-temperature combustion gas and is toward a center of a flow of the high-temperature combustion gas for mixed cooling
Data Source
AI summary
[Problems] A combustion gas extraction probe that is capable of preventing burnout of a head metal portion of a probe, capable of rapidly cooling a high-temperature gas in a uniform manner in a probe, and whose outer diameter can be kept small.[Means for Solving Problems] A combustion gas extraction probe (4) having a hollow-cylindrical inner tube (4a) in which a high-temperature combustion gas flows, a hollow-cylindrical outer tube (4b) surrounding the inner tube (4a), a low-temperature gas discharge hole (4c) provided in the inner tube (4a), and a low-temperature gas supply means (9) for supplying a low-temperature gas between the inner tube (4a) and the outer tube (4b) and discharging the low-temperature gas from the discharge hole (4c) into the direction that is substantially perpendicular to the sucking direction of the high-temperature combustion gas and is toward the center of the flow of said high-temperature combustion gas. Alternatively, plural discharge holes (4c) may be provided, where the individual discharge holes (4c) are arranged at substantially the same positions from the head of the probe in the high-temperature combustion gas sucking direction, or alternatively, the discharge holes (4c) may be arranged in stages in the high-temperature combustion gas sucking direction. The flow speeds of the low-temperature gas and the high-temperature combustion gas are preferably not less than 40 m/s and not more than 100 m/s.