Hydrogen Total Primary Combustion Burner With Sintered Backfire Plate
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Solution Overview
Problem
Conventional total primary combustion burners using hydrogen gas face issues with backfire suppression and pressure loss due to the rapid combustion speed and narrow gaps, leading to burner breakage and increased pressure loss.
Innovation Solution
A total primary combustion burner design incorporating a backfire suppressing plate made of a sintered sheet formed by sintering metallic fibers or beads, with intricate micro-porosities smaller than the backfire limit, to suppress backfire and pressure loss, and equipped with a temperature sensor for flame detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between combustion plate portion and backfire suppressing plate portion is set narrow (1-4 mm) to suppress backfire, then backfire suppression is improved, but pressure loss increases and the backfire suppressing plate portion becomes excessively heated
Solution Approach 1:
The backfire suppressing plate portion is constructed using a sintered sheet with numerous micro-porosities instead of a solid plate with through-holes. These micro-porosities are smaller than the backfire limit diameter, allowing the air-fuel mixture to pass through while suppressing backfire. The porous structure provides larger total flow area compared to through-holes, reducing pressure loss while maintaining backfire suppression effectiveness.
2Reliability
If the diameter of through-holes in backfire suppressing plate portion is reduced to suppress backfire (e.g., 0.6 mm), then backfire suppression is improved, but pressure loss increases
Solution Approach 1:
Instead of using through-holes with small diameters, the invention employs a sintered sheet with distributed micro-porosities. The cumulative effect of numerous small pores provides equivalent backfire suppression to a single large hole, while the distributed flow paths reduce pressure loss compared to flow through a limited number of small through-holes.
Solution Approach 2:
The backfire suppressing plate portion uses a composite structure combining sintered material with controlled porosity. This composite approach allows optimization of both backfire suppression (through pore size control) and pressure loss (through porosity distribution), achieving a balance that solid plates with through-holes cannot provide.
3Object-affected harmful factors
If hydrogen gas is used as fuel gas to reduce carbon dioxide emissions, then environmental performance is improved, but combustion speed becomes extremely rapid causing combustion plate portion to reach high temperatures and backfire suppression becomes difficult
Solution Approach 1:
The sintered sheet with micro-porosities acts as a thermal barrier and flow control mechanism. The numerous small pores slow down the rapid combustion front by increasing the path length and reducing the effective combustion area, while the material's thermal properties help manage the high temperatures generated by hydrogen combustion.
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
Effectively suppresses backfire and pressure loss while utilizing hydrogen gas, preventing burner damage by extinguishing flames and reducing noise and overheating risks.
Implementation Method 1
a backfire suppressing plate portion has a sintered sheet formed by sintering an aggregate of metallic fibers or beads
Implementation Method 2
the air-fuel mixture passing through the backfire suppressing plate portion is configured to eject from the combustion plate portion and undergoes combustion
Data Source
AI summary
A total primary combustion burner which includes a burner body with an air-fuel mixture chamber into which an air-fuel mixture of a fuel gas and primary air is supplied, a combustion plate portion covering an opening surface, which faces the air-fuel mixture chamber, of the burner body, and a backfire suppressing plate portion disposed opposite the combustion plate portion with a gap inside the air-fuel mixture chamber. The air-fuel mixture passing through the backfire suppressing plate portion ejects from the combustion plate portion and undergoes combustion. The total primary combustion burner is configured so that backfire can be suppressed as much as possible while suppressing pressure loss, even when using hydrogen as the fuel gas. The backfire suppressing plate portion has a sintered sheet obtained by sintering a laminate made by sintering an aggregate of metallic fibers or beads.