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Heat pipe based air preheater for thermal power plants

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  1. Introduction
    1. Introduction to the project
    2. Need of computerization
    3. Proposed software
    4. Importance of the work
  2. System analysis
    1. Analysis methodology
    2. Feasibility analysis
    3. Choice of the platform
    4. Software used
    5. Hardware used
  3. System design
    1. Design methodology
    2. Database design
    3. Form/screen design
    4. Input modules/forms of the project
  4. Tools used
    1. Visual basic
    2. Oracle
    3. MS Access
  5. Testing and implementation
    1. Testing methodology
    2. Unit testing
    3. Module testing
    4. System testing
    5. White box/black box testing
    6. Implementation manual
    7. Post implementation modification
  6. Conclusion
  7. Annexure
  8. Bibliography

Modern day thermal power plants try to utilize more & more heat available from burning of coal. In the process reducing the heat loss to the surroundings and increasing the efficiency. Devices like economizer and air preheater are manifestations for the same purpose. Most of the power plants in India rely on air preheaters of the Ljungstrom type ? the regenerative variety or the tubular type ? the recuperative variety. These air pre heaters have limitations with respect to having a large size and less efficiency of heat transfer.

The captive power plant of HINDALCO Industries Limited at Renusagar also uses air pre heaters of Ljungstrom type for its older units & of tubular type for its new units. These air pre heaters have inherent drawbacks of low heat transfer and more soot formation. These can be removed by using the Heat Pipe technology for air pre heating.

The problem before the team is to develop a ?Heat Pipe based Air Pre Heater for Thermal Power Plants? based on the design specifications of the current air pre heater being used by Messrs. HINDALCO Industries Limited and to test its feasibility by making a scaled model of the heat pipe air pre heater and testing it in the laboratory. This is a collaborative project between the students of the institute and Messrs. HINDALCO Industries Limited with the latter providing information about its on-site resources, processes and parameters. And the former sharing the results of the project and findings with the industry.

[...] For a wrapped screen wick structure the effective thermal conductivity Where Kw - thermal conductivity of the wick Kl - thermal conductivity of liquid ? - wick porosity For the wick structure with rectangular grooves, we have Where w - groove width, wire spacing (meter) wf - frictional groove width(fin) kf -thermal conductivity of frictional ? - groove depth 4.4 MODELLING OF EVAPORATOR SECTION The evaporator section is heat pipe air pre heater of a thermal power plant takes in heat from hot flue gases and transfers it to the fluid inside the heat pipe. [...]

[...] below 0.1 atm, the vapor pressure limit may be approached while Above 20atm, the container thickness must be increased to a point where the heat pipe operation is limited by the increased thermal resistance. The important requirements of a wick structure are listed below: Should be compatible with the wick and container material High latent heat High thermal conductivity High surface tension Low liquid and vapor viscosities Wettability of wick and wall materials THE WICK The wick structure in a heat pipe facilitates liquid return to the evaporator from the condenser. [...]

[...] The radial resistance of the pipe wall can be obtained by using Fourier's law as, An expression for equivalent thermal resistance of liquid wick combination is, Where, k eff is the effective thermal conductivity of the heat pipe and typical expressions are listed in Table LITERATURE REVIEW Recent researches on heat pipes have not considered directly any application in air preheater for a thermal power plant. A variety of fields like electronic cooling, gypsum drying, nuclear rector applications etc. have been discussed. [...]

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