Finned Heating Tubes with Unfixed Mounting for Waste Heat Boiler Dedusting

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Solution Overview

Problem

Current waste heat boilers are ineffective in recovering heat from exhaust gases with temperatures between 300° C. to 500° C. and dust concentrations of 10 g/Nm3 to 100 g/Nm3, due to high dust adhesiveness and the lack of a combination of fin structures with dedusting devices, leading to degraded heat transfer performance and increased costs.

Innovation Solution

A waste heat boiler design featuring finned heating tubes connected to support assemblies in an unfixed manner, allowing for effective hammering and dedusting, combined with a soot blowing device for efficient dust removal, which enhances heat transfer performance without increasing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If finned heating tubes are used to increase heat exchange area, then heat transfer performance is improved, but dust adhesion increases and blocks spaces between fins

Engineering Contradiction:

Improveheat transfer performanceVSAvoiddust adhesion

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The heating tubes are designed to be movable relative to the support assembly through a loose connection structure, allowing the tubes to vibrate and shake off adhered dust dynamically, transforming the static dust accumulation problem into a dynamic cleaning solution

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The loose connection between heating tubes and support assembly enables mechanical vibration of the tubes during operation, which generates shaking forces that prevent dust from firmly adhering to the fin surfaces and facilitate automatic dust removal

Inventive Principle:

Principle #18Mechanical vibration

2Ease of operation

If hammering device is used to clean dust from heating tubes, then dust removal is achieved, but impact force damages mounting accessories and reduces durability

Engineering Contradiction:

Improvedust removal effectivenessVSAvoidmounting accessory durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The heating tubes are designed with movable connection to support assembly, allowing them to absorb and dissipate impact forces through motion rather than transmitting rigid shocks to mounting accessories, thereby protecting the durability of support structures

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The loose connection structure acts as a built-in cushioning mechanism that absorbs impact energy from hammering operations before it can reach the mounting accessories, preventing damage in advance

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If staggered tube arrangement is used to avoid dust blocking, then heat transfer is maintained, but dust still adheres easily to tube surfaces

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoiddust adhesion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The movable connection between heating tubes and support assembly enables the tubes to vibrate and shake off adhered dust, dynamically preventing dust accumulation on tube surfaces even in staggered arrangements where adhesion is prone to occur

Inventive Principle:

Principle #15Dynamics

4Use of energy by moving object

If bare tubes are used for quick heat transfer, then energy consumption is low, but heat exchange area must be increased requiring more tubes and higher cost

Engineering Contradiction:

Improveenergy consumptionVSAvoidboiler cost

Core Design Contradiction:

Use of energy by moving objectVSEase of manufacture

Solution Approach 1:

The invention merges the advantages of finned tubes (large heat exchange area) with bare tubes (low energy consumption) by using finned tubes with movable connection that enables automatic dust removal, achieving both high heat transfer efficiency and energy efficiency without requiring excessive tube numbers

Inventive Principle:

Principle #5Merging (Combining)

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 solution achieves high heat transfer efficiency, effective dedusting, and improved durability, enabling the recovery of various grades of exhaust gases with high adhesiveness, while maintaining low energy consumption and cost-effectiveness.

Implementation Method 1

The finned tube is adopted in the AQC boiler. The heat exchange area is greatly increased

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 2

The heat transfer performance and energy consumption rate of the waste heat boiler mainly depend on the heating tube

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

One type of rapping device hammers the lower portions of heating tubes arranged vertically

Methodology Applied

Scientific EffectImpact force: Impact Force

Implementation Method 4

The waste heat boiler capable of recovering waste heat in exhaust gas

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS10907822B2Waste heat boiler

Publication Date: 2021.02.02 KAWASAKI JUKOGYO KK

AI summary

The present provides a waste heat boiler and a hammering device, a heating tube mounting structure thereof. The waste heat boiler which a boiler, heating tubes provided in the boiler and a hammering device; the boiler is provided with an exhaust gas inlet and an exhaust gas outlet; the heating tubes are in a horizontal grid tube arrangement; a surface of the heating tubes is provided with fins, and the heating tubes are connected to support assemblies in an unfixed way.