Helical Coil Heat Exchanger Soot Blower Design
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Solution Overview
Problem
Existing heat exchangers with helical coils face challenges in efficiently cleaning all turns, especially the outer and upper turns, due to limitations in soot blower access and arrangement, leading to reduced heat transfer efficiency from flue gases to the fluid being heated.
Innovation Solution
A soot blowing device with an ejection pipe positioned between two adjacent turns of the helical coil, extending in parallel to the flow direction, and supported by a device that increases the pitch between turns to accommodate the ejection pipe, ensuring thorough cleaning of all coil turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a soot blower is positioned to clean the inner coil, then the inner coil can be cleaned, but the outer coil turns remain hard to reach and clean
Solution Approach 1:
The soot blower device is segmented into multiple ejection pipes positioned at different locations (inner coil and outer coil) to independently clean different sections of the helical coils, ensuring all turns are accessible and cleanable
Solution Approach 2:
The ejection pipes extend in different spatial dimensions and directions to reach various turns of the helical coils, including upper, lower, inner, and outer turns, providing comprehensive cleaning coverage
2Ease of operation
If vertical pipes are arranged to clean helical coils, then cleaning can be performed, but a radial distance between inner and outer coils is required
Solution Approach 1:
The ejection pipes are designed to be movable or adjustable in position and orientation, allowing them to dynamically adapt to different coil configurations and eliminate the need for fixed radial distance arrangements
Solution Approach 2:
The ejection pipes serve as intermediary elements that can be positioned flexibly between the inner and outer coils, enabling cleaning action without requiring direct radial spacing between the coils themselves
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 configuration allows for efficient cleaning of all helical coil turns, including those previously hard to reach, thereby maintaining or improving heat transfer efficiency by effectively removing impurities from the flue gas path.
Implementation Method 1
a soot blowing device comprising a first ejection pipe having a plurality of nozzle openings in a pipe wall and being configured to permit ejection of a cleaning medium onto the first tube
Implementation Method 2
remove the impurities from the tubes, i.e. to clean the boiler
Implementation Method 3
a tube arrangement for a fluid to be heated by the flue gases
Implementation Method 4
heating a fluid by flue gases
Implementation Method 5
supported by a device that increases the pitch between turns to accommodate the ejection pipe
Data Source
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AI summary
A heat exchanger comprises a casing (1) forming a channel (2) for flue gases, and a tube arrangement (10) for a fluid to be heated by the flue gases. The tube arrangement comprises four tubes (11-14) provided in the channel (2) for conveying the fluid. The tubes comprises a respective helical coil having a longitudinal center axis, a plurality of turns and a default pitch. A soot blowing device (30) comprises a first ejection pipe (31) having a plurality of nozzle openings (32) for ejecting a cleaning medium onto the tubes. The first intermediate ejection pipe is provided at an intermediate position in the helical coil of the tubes between two adjacent turns of the helical coil of the tubes.