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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers, Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for, Vaporizer, double bundle, constructional features, Vapors, saturation properties of, Vapors, properties of superheated, Vasiliev, L, Vassilicos, J C, Velocity defect law: Velocity distribution: Velocity fluctuations, in turbulent pipe flow, Velocity ratio (slip ratio): Venting of condensers Vertical condensers: Vertical cylindrical fired heater, Vertical pipes: Vertical surfaces: Vertical thermosiphon reboilers: Vessels of non-circular cross section, design to ASME VIII code, Vessels of rectangular cross section, EN13445 guidance for, Vetere method, for enthalpy of vaporisation, Vibrated beds, heat transfer to, Vibration:
in augmentation of heat transfer, numerical methods for prediction of occurrence of, of tubes, for fouling mitigation,
Fouling Mitigation and Heat Exchangers Cleaning
Vinyl acetate: Vinyl benzene: Vinyl chloride: Virial equation: Virk equation for maximum drag reduction, Visco-elastic fluids, flow of, Viscometric functions (non-Newtonian flow), methods of determining, Viscosity: Viscosity number (Vi), Viscous dissipation, influence on heat transfer in non-Newtonian flows, Viscous heat generation, in scraped sauce heat exchangers, Viscous sublayer, in duct flow, Void fraction, Voidage, in fixed beds, definition, Volumetric heat transfer coefficient, Volumetric mass transfer coefficient, von Karman friction factor equation for fully rough surface, von Karman velocity defect law, Vortex flow, in helical coils of rectangular cross section, Vortex flow model, for twisted tube heat exchangers, Vortex shedding:

Index

HEDH
A B C D E F G H I J K L M N O P Q R S T U V
Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers, Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for, Vaporizer, double bundle, constructional features, Vapors, saturation properties of, Vapors, properties of superheated, Vasiliev, L, Vassilicos, J C, Velocity defect law: Velocity distribution: Velocity fluctuations, in turbulent pipe flow, Velocity ratio (slip ratio): Venting of condensers Vertical condensers: Vertical cylindrical fired heater, Vertical pipes: Vertical surfaces: Vertical thermosiphon reboilers: Vessels of non-circular cross section, design to ASME VIII code, Vessels of rectangular cross section, EN13445 guidance for, Vetere method, for enthalpy of vaporisation, Vibrated beds, heat transfer to, Vibration:
in augmentation of heat transfer, numerical methods for prediction of occurrence of, of tubes, for fouling mitigation,
Fouling Mitigation and Heat Exchangers Cleaning
Vinyl acetate: Vinyl benzene: Vinyl chloride: Virial equation: Virk equation for maximum drag reduction, Visco-elastic fluids, flow of, Viscometric functions (non-Newtonian flow), methods of determining, Viscosity: Viscosity number (Vi), Viscous dissipation, influence on heat transfer in non-Newtonian flows, Viscous heat generation, in scraped sauce heat exchangers, Viscous sublayer, in duct flow, Void fraction, Voidage, in fixed beds, definition, Volumetric heat transfer coefficient, Volumetric mass transfer coefficient, von Karman friction factor equation for fully rough surface, von Karman velocity defect law, Vortex flow, in helical coils of rectangular cross section, Vortex flow model, for twisted tube heat exchangers, Vortex shedding:
W X Y Z
V Vibration: of tubes, for fouling mitigation,
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Fouling Mitigation and Heat Exchangers Cleaning

DOI 10.1615/hedhme.a.000364

3.17 FOULING IN HEAT EXCHANGERS
3.17.8 Fouling mitigation and heat exchanger cleaning

T. R. Bott, G. F. Hays, J. G. Knudsen, E. R. Miller, A. P. Watkinson, D. I. Wilson

A. Fouling control measures

(a) Physical Mitigation Techniques
(by T. R. Bott)

The removal of deposits from heat exchanger surfaces may be achieved by the application of suitable forces that dislodge the accumulation of unwanted material. In many instances the removal forces are applied through a fluid medium, often it is the process fluid itself that provides the means of applying the removal force. In other situations, deposits are prevented from forming or are knocked from the surface, by a solid agent. Some of the techniques lend themselves to on line cleaning i.e. the process is continued while the mitigation takes place. Other techniques may require that the plant is shut down, or at any rate the particular heat exchanger in question is taken out of service for cleaning. Many of the techniques are not universal and have been developed to meet particular requirements and processes.

I. Circulation of Sponge Rubber Balls

In the power industry the maintenance of steam condenser performance is essential to maintain generation efficiency and competitiveness. In order to maximize the output from the turbine generation set, it is necessary to ensure that the lowest possible pressure in the steam condenser is retained. Condensation is achieved by the circulation of cooling water through the tubes of very large shell and tube exchangers. The system may be once through or recirculating. Since in general, the water system is open to the atmosphere it is likely to become contaminated with microorganisms and particulate matter that accumulate in the condensers where the conditions favor the formation of biofilms (see Section 358). In addition, scale formation is possible, where the concentration of dissolved solids reaches saturation levels (due to evaporative cooling of the water). In addition particulate products of corrosion may also accumulate on the surface, or the surface itself may become corroded. The consequence, if mitigation techniques are not applied, is the formation of slime layer (due to microbial colonization) in conjunction with particulate deposition, products of corrosion and crystal formation where conditions are suitable.

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