Conical Burner Basket Wall for Ammonia Oxidation
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Solution Overview
Problem
In ammonia oxidation burners, the mechanical disconnection between the burner basket wall and gas-permeable base plate leads to gas slip and wave formation, causing catalyst material to fall and reducing combustion efficiency, which results in ammonia slip and nitric acid production loss.
Innovation Solution
A conically tapered burner basket wall with a loosely placed gas-permeable base plate and an additional finer-meshed gas-permeable structure over the gap between the wall and base plate minimize gas slip and wave formation, preventing catalyst material loss and ensuring efficient nitric acid production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gas-permeable base plate is placed loosely on existing structures in the ammonia oxidation burner, then the burner basket can accommodate thermal expansion, but a peripheral gap arises between the burner basket wall and the gas-permeable base plate causing gas slip
Solution Approach 1:
The patent applies a flexible sealing element (peripheral film or membrane) between the burner basket wall and the gas-permeable base plate. This flexible element can deform to accommodate thermal expansion while maintaining sealing performance, preventing gas slip through the gap that would otherwise form between the rigid components.
Solution Approach 2:
The patent introduces a peripheral sealing element as an intermediary component between the burner basket wall and the gas-permeable base plate. This intermediary element mediates the interaction between the two components, allowing relative movement due to thermal expansion while preventing gas leakage through the interface gap.
2Adaptability or versatility
If the support grids are placed loosely on existing installations, then flexibility is provided for thermal expansion, but carrier material falls through the gap and bulk structure is destroyed
Solution Approach 1:
The patent uses a flexible peripheral sealing element that extends over the gap between the burner basket wall and the gas-permeable base plate. This flexible film prevents carrier material from falling through the gap while still allowing the support grids to move freely for thermal expansion accommodation.
Solution Approach 2:
The peripheral sealing element acts as an intermediary barrier that prevents carrier material from falling through the gap caused by loose placement of support grids, while not interfering with the thermal expansion flexibility of the burner basket system.
3Ease of manufacture
If a cylindrical burner basket wall is used, then construction is simple, but gas slip occurs and combustion efficiency decreases
Solution Approach 1:
The patent adds a flexible peripheral sealing element to the cylindrical burner basket wall construction. This addition maintains the simplicity of the cylindrical shape while preventing gas slip through the peripheral gap, thereby preserving combustion efficiency without complicating the basic construction.
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 conical design reduces thermal expansion forces and enhances sealing, preventing catalyst material loss and maintaining combustion efficiency, thereby minimizing ammonia slip and ensuring effective nitric acid production.
Implementation Method 1
the burner basket to expand accordingly. This expansion takes place somewhat later in places that are covered with carrier materials
Implementation Method 2
support grids, which can be designed as perforated plates, for example, whose free cross-section is at least equal to or greater than the relative void volume of the packing
Data Source
Figure 1a~1c
AI summary
The invention relates to a system of a burner basket for ammonia oxidation burners for industrial plants with burner diameters of 2-7 m in a natural- or forced-circulation boiler suitable for minimizing gas slip and for minimizing wave formation of means contained in the burner basket, and also for minimizing loss of means contained in the burner basket, wherein the burner basket has a wall (1) that is anchored in the ammonia oxidation burner and the burner basket has a gas-permeable bottom plate (2), which is placed on internal fittings of the forced circulation boiler, wherein the wall (1) and the gas-permeable bottom plate (2) are not mechanically connected to each other, and the wall (3) of the burner basket tapers conically towards the bottom plate at an angle of 5-20° from the perpendicular, and in all operating states of the ammonia oxidation burner there is a peripheral gap in the range from 5 to 10 mm between the wall (1) and the gas-permeable bottom plate (2).