Gasification Reactor Burner Muffle Slag Protection
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Solution Overview
Problem
Gasification reactors face challenges operating at high pressures due to slag ingress into the burner muffle, causing high heat fluxes and potential melting of the membrane wall, especially when using high-ash feedstocks, which leads to inadequate cooling and reduced reactor reliability.
Innovation Solution
A gasification reactor design featuring a burner muffle with concentric, vertically oriented rings of increasing diameter, protruding into the reaction zone, with adequate cooling and a sealing mechanism to prevent slag ingress and reduce local heat fluxes, allowing operation at pressures above 30 bar and widening the operational temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gasification reactor operates at higher pressures to reduce reactor size, then productivity is improved, but slag ingresses into the burner muffle causing high heat fluxes and potential membrane wall melting
Solution Approach 1:
A protruding burner muffle acts as an intermediary barrier between the slag flow and the burner head. The muffle protrudes into the reaction zone to intercept and deflect slag before it can reach the burner head, thereby protecting the combustion process from slag interference while allowing high-pressure operation to maintain reactor compactness and productivity
Solution Approach 2:
The burner muffle is designed with a three-dimensional protruding structure extending into the reaction zone. This dimensional extension creates a physical barrier that intercepts slag flowing down the membrane wall, preventing it from reaching the burner head. The protrusion adds a vertical dimension to the burner assembly, effectively blocking slag pathways without compromising the horizontal pressure-containing structure
2Area of stationary object
If reactor diameter is reduced to decrease circumferential area for slag flow, then heat flux concentration increases, but this causes slag to deflect towards metallic muffle walls resulting in extreme heat fluxes
Solution Approach 1:
The protruding burner muffle serves as a protective intermediary that intercepts slag before it can reach the metallic muffle walls. By positioning the muffle protrusion in the slag flow path, it prevents direct contact between slag and the metallic components, thereby eliminating the source of extreme heat fluxes that would otherwise concentrate on the muffle walls
Solution Approach 2:
The harmful interaction between slag and metallic muffle walls is extracted and eliminated by the protruding muffle structure. The muffle acts as a barrier that removes slag from the potential heat transfer pathway to the metallic walls, separating the slag flow from the temperature-sensitive metallic components and preventing concentrated heat fluxes
3Reliability
If burner muffle is designed with concentric rings of increasing diameter to prevent slag ingress, then reliability is improved, but device complexity increases
Solution Approach 1:
The burner muffle is segmented into multiple concentric rings of increasing diameter, with each ring acting as a separate barrier element. This segmentation creates a stepped or annular structure that effectively intercepts slag flow through multiple levels of protection, enhancing reliability by providing redundant barriers against slag ingress while maintaining a manageable structural complexity through modular ring design
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 design enhances the reactor's robustness and efficiency by preventing slag from entering the burner muffle, reducing heat fluxes, and extending the operational temperature range, making the process safer, easier, and more efficient while consuming less oxygen.
Implementation Method 1
the rings being a conduit having an inlet end for a cooling medium and an outlet for used cooling medium
Implementation Method 2
The tubular shaped membrane wall comprises of interconnected conduits in which evaporating cooling water is present
Implementation Method 3
a horizontally directed burner having a burner head at which, in use, a combustion flame is discharged into said reaction zone
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Gasification reactor comprising a pressure shell (1), an reaction zone (2) partly bounded by a vertically oriented tubular membrane wall (3), a horizontally directed burner (13) having a burner head at which, in use, a combustion flame is discharged into said reaction zone (2), said burner (13) protruding the vertical wall part of the membrane wall (3) via a burner muffle (14), said burner muffle (14) comprising several vertically oriented, concentric and interconnected rings (15), wherein each ring has an increasing diameter relative to its neighbouring ring resulting in that the burner muffle (14) has a muffle opening (16) for the burner head at one end and a larger opening (18) at its other - flame discharge - end, the rings (15) being a conduit having an inlet end (21) for a cooling medium and an outlet (21) for used cooling medium and wherein the muffle opening for the burner head is located between the pressure shell (1) and the membrane wall (3) and wherein the burner muffle (14) protrudes into the reaction zone (2).