Externally Enhanced Condenser Tubes for Compact Internal Condensers

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Solution Overview

Problem

Conventional internal tubular condensers in distillation columns suffer from low heat transfer coefficients and large required condenser tube surface areas, especially in low pressure drop and low mass velocity regimes, leading to impractical installation sizes and costs.

Innovation Solution

The use of surface-enhanced condenser tubes with features such as circumferentially extending fins, axially extending fins, shaped recessions, and twisted geometries, combined with internal coatings like enhanced boiling layers, to improve heat transfer coefficients and reduce the necessary exchanger area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional smooth tubes are used in internal condensers, then the installation is simpler and manufacturing is easier, but the heat transfer coefficient is low and the required surface area is large

Engineering Contradiction:

Improveease of manufactureVSAvoidheat transfer coefficient

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies porous metallic matrices and sintered metal structures on tube surfaces to create enhanced heat transfer. The porous structure provides numerous nucleation sites for bubble formation and increases surface area, dramatically improving heat transfer coefficients while maintaining manufacturability through established sintering processes

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent changes the physical parameters of the tube surface by applying coatings and creating textured structures. These modifications alter surface roughness, porosity, and thermal conductivity parameters to optimize heat transfer performance without fundamentally changing the tube manufacturing process

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If conventional smooth tubes are used in internal condensers, then the device complexity is lower, but the required condenser tube surface area is large leading to impractical installation sizes

Engineering Contradiction:

Improvedevice complexityVSAvoidcondenser tube surface area

Core Design Contradiction:

Device complexityVSArea of stationary object

Solution Approach 1:

Porous coatings and sintered metal layers are applied to tube surfaces to dramatically increase the effective heat transfer area within the same geometric dimensions. This allows compact condenser designs that fit within distillation columns without increasing overall device complexity

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent employs tube bundles where enhanced tubes are inserted into existing condenser configurations. The enhanced tubes nest within the same spatial envelope as conventional tubes, providing increased surface area without requiring larger installation space

Inventive Principle:

Principle #7Nested doll (Nesting)

3Productivity

If enhanced surface tubes are used, then the heat transfer coefficient increases, but the manufacturing complexity increases

Engineering Contradiction:

Improveheat transfer coefficientVSAvoidease of manufacture

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent applies surface treatments and coatings that modify physical parameters like roughness and porosity using established industrial processes. These parameter changes achieve enhanced heat transfer while maintaining compatibility with standard manufacturing workflows

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite structures combining base metal tubes with porous metallic matrices or ceramic coatings. These composite materials provide superior heat transfer properties while being manufactured through established composite fabrication techniques

Inventive Principle:

Principle #40Composite materials

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

These enhancements increase the heat transfer coefficient by a factor of 1.5 to 10, allowing for feasible installation in larger-diameter columns and reducing the need for more costly heat exchangers like welded plate or external condensers.

Implementation Method 1

tubes that are generally contained in tube bundles and have enhanced capacity for exchanging heat between fluids external to the tubes and passing through the tubes

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

An exemplary tube bundle extends vertically within a distillation column and is used to condense liquid from vapors generated in the column

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS8196909B2Tubular condensers having tubes with external enhancements

Publication Date: 2012.06.12 UOP LLC

AI summary

Improvements in tubes, which increase the heat exchange capacity of tubular heat exchangers using the tubes, are described. These improvements involve the use of one or more external surface enhancements, optionally combined with an internal enhancement and/or differing tube geometries. These improvements apply, for example, to internal condensers, including those in which the tube bundles are oriented vertically, in vapor-liquid contacting apparatuses such as distillation columns.