Closed Feedwater Heater, Operation, Maintenance & Performance - 2 Day Seminar

 

Presentation Time:    Eight sessions totaling 2 days

 

 

Reference Material:     Each participant will receive text material that will serve as a guide and will minimize the need for note taking.  Background information, copies of diagrams, and relevant papers will be included in the text.

 

 

Lecture Abstract:   Closed Feedwater Heater Design, Operation and Maintenance is a slide assisted lecture/discussion seminar that is presented by an ex­perienced power plant heat exchanger engineer.  It is directed to­wards plant engineers, results/performance engineers and plant operations/maintenance supervisors.

 

The intent of the seminar is to provide the participants with the necessary background information that is required to identify, eval­uate, and correct feedwater heater operation and maintenance prob­lems.  This information includes a review of the related heat transfer principles and a review  of feedwater heater design and construction principles.  Techniques for identifying failures and heat transfer defi­ciencies are identified.  The multiple choices of possible corrective actions that can be taken in each given situation are presented.  This seminar segment is followed by a discussion of the methods that are employed to select the optimum technical-economic corrective action, amongst all of the choices that were previously described.

 

SEMINAR OUTLINE

 

SESSION 1 - Heat Transfer Principles

 

The functions of a feedwater heater are discussed.  Each zone is treat­ed separately and the effects of multiple zones are reviewed.  The effects of cascading drains are also discussed.  Feedwater heater temperature duty diagrams are reviewed and related to measured performance parameters.  The feedwater heaters place in the cycle is also discussed.

 

 

SESSION 2 - Heat Transfer Rating in Closed Feedwater Heaters

 

Feedwater heater rating is reviewed.  Methods of determining heat transfer resistances or limits of resistance are identified.  A feedwater heater heat balance determination method is presented.

 

 

SESSION 3 - Feedwater Heater Functions and Theory of Operation/Application

 

 The functions of a feedwater heater are discussed.  Each zone is treat­ed separately and the effects of multiple zones are reviewed.  The effects of cascading drains are also discussed.  Feedwater heater temperature duty diagrams are reviewed and related to measured performance parameters.  The feedwater heaters place in the cycle is also discussed.

 

SESSION 4 - Design and Construction

 

Nomenclature is reviewed.  Specific information regarding tube material selection, tube fabrication and tube mill quality control is provided. Channel and tubesheet design and construction is re­viewed.  Alternate methods of tube joint design and tube joint fabri­cation are discussed.  Key component designs, such as the drain cooler end plate are also discussed.

 

SESSION 5 - Feedwater Heater Failure Causes

 

An overview of the most frequent failure causes such as impingement erosion is presented.  The relationship between feedwater design, feedwater heater normal and abnormal modes of operation, alternate tube materials and other component failures such as impingement plates are discussed.

 

SESSION 6 - Feedwater Heater Operation and Maintenance

 

The maintenance of level, the effects of heaters out of service, leak detection, record keeping, visual examination, lay up, selected repair technologies including tube plugging are discussed.

 

SESSION 7 - Feedwater Heater Performance

 

Review of instrumentation types and application, parameters to be monitored on an operator level, TTD and DCA monitoring, perfor­mance testing, and alternate cleaning techniques are discussed.  Some guidance for feedwater heater trouble shooting analysis is presented.

 

SESSION 8 - Non-Destructive and Destructive Examination Techniques

 

Principles of various techniques including eddy current testing and ultrasonic testing will be discussed and their application to condens­ers and feedwater heaters will be identified.

 

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