Nozzle Tip Flame Stabilizer Curved Surface Coal Flow

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Solution Overview

Problem

Conventional nozzle tips for pulverized coal burners suffer from abrasion and separation of flame stabilizers due to the flow of pulverized coal, leading to ineffective flame regulation and increased nitrogen oxide (NOx) production.

Innovation Solution

The nozzle tip features an inner tubular body with a first passage for pulverized coal flow, an outer tubular body, and a plurality of flame stabilizers with inclined surfaces that direct coal flow centrally, reducing wear and separation by dispersing coal momentum and preventing cumulative coal attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If flame stabilizers are fixed to the inner tubular body to stabilize flame, then flame stability is improved, but abrasion and separation occur due to pulverized coal flow

Engineering Contradiction:

Improveflame stabilityVSAvoidwear resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The flame stabilizer is designed with a curved surface facing the pulverized coal flow direction, allowing the coal particles to follow the curved path rather than directly impacting the stabilizer. This curvature reduces the abrasive effect while maintaining the flame stabilization function through the curved flow pattern.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention utilizes the pulverized coal flow itself to protect the flame stabilizer by creating a protective layer of coal particles that reduces direct abrasion on the stabilizer surface, converting the harmful abrasive flow into a protective mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If share bars are welded to the inner tubular body to pull flame toward nozzle tip, then flame regulation is improved, but welded portions crack due to radiant heat

Engineering Contradiction:

Improveflame regulationVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The flame stabilizer is divided into multiple independent segments rather than using welded share bars. This segmentation eliminates the welded joints that are susceptible to cracking from thermal radiation, while each segment independently contributes to flame pulling and regulation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flame stabilizer structure performs multiple functions simultaneously: it stabilizes the flame, pulls flame toward the nozzle tip, and resists thermal radiation cracking, replacing the separate share bar system that failed under thermal stress.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If guide blades are used to supply pulverized coal to flame stabilizers, then coal supply efficiency is improved, but cumulative coal attachment increases wear

Engineering Contradiction:

Improvecoal supply efficiencyVSAvoidmaterial loss

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The curved surface of the flame stabilizer guides pulverized coal particles along a curved path, preventing them from accumulating on flat surfaces. This curvature design maintains efficient coal supply to the flame while reducing material loss through abrasion and attachment.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention changes the surface geometry parameter of the flame stabilizer from flat to curved, which fundamentally alters how pulverized coal interacts with the surface, reducing cumulative attachment and associated wear while maintaining supply efficiency.

Inventive Principle:

Principle #35Parameter changes

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 enhances wear resistance, maintains flame stability, reduces NOx production, and extends the nozzle tip's service life by preventing abrasion and separation of flame stabilizers, ensuring consistent operation and reduced replacement costs.

Implementation Method 1

each of the flame stabilizers has an inclined surface formed on a side thereof facing a direction in which the pulverized coal flows in the first passage, the inclined surface being inclined toward a central portion of the inner tubular body

Methodology Applied

Scientific EffectMomentum dispersion: Conservation of Momentum

Data Source

PatentEP3249294B1Nozzle tip of pulverized coal burner

Publication Date: 2019.08.14 DOOSAN HEAVY IND & CONSTR CO LTD

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AI summary

Disclosed herein is a nozzle tip of a pulverized coal burner, which is capable of preventing the abrasion and separation of flame stabilizers due to the flow of pulverized coal. The nozzle tip includes an inner tubular body (100) having a first passage (120) in which pulverized coal introduced into the inner tubular body (100) flows, an outer tubular body (200) installed outside the inner tubular body (100) while being spaced apart therefrom, and at least one guide plate (300) installed to partition the first passage (120). The nozzle tip further comprises: a plurality of flame stabilizers (400) arranged in a row at the upper and/or lower side in the inner tubular body (100), wherein each of the flame stabilizers (400) has an inclined surface (420, 1420) formed on a side thereof facing a direction in which the pulverized coal flows in the first passage (120), the inclined surface (420, 1420) being inclined toward a central portion of the inner tubular body (100).