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  • Users: rgrokkam
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  1. rgrokkam

    role of a chemical engineer in steel industry

    Dear All, The casting of molten steel into blooms and the rolling process fascinated me as a child but now I am into refining. Can someone enlighten me on the role/job profile of a chemical engineer at a steel plant. Thanks
  2. rgrokkam

    heat recovery

    Dear All, I've a two heat exchgrs A, B in series. Desalted crude is being heated on tube side with gas oil on shell side. Over a 3month time I observed that 1. outlet temp of crude from exchgr B has dropped 2. pressure drop across B is also high both when compared to A. (Directionally, B is...
  3. rgrokkam

    mCpdT and UAdT

    Can anyone explain the difference between mCpdT and UAdT..
  4. rgrokkam

    steam drum

    Dear All, Of late two steam drums in boilers of our power plant have shown cracks during RLI. Can the forum throw some light on the possible reasons for cracks in steam drum and how to go about a preliminary investigation. Thanks
  5. rgrokkam

    rate equation

    Dear All, I am trying to model a steam-naphtha reformer. I hit a block in searching the rate equations for methane reforming and shift reaction. Googl'ng did help in getting equations but some constants were missing. Any help would be appreciated.
  6. rgrokkam

    time required to heat a catalytic bed

    Dear All, I've noticed catalytic fixed bed reactors being heated to specified temperature(start up) by either hydrogen or nitrogen. How can I estimate the time and quantity of hydrogen/nitrogen required to heat the bed to a specified temperature? Also ,what factors go into choosing between...
  7. rgrokkam

    TADP of toluene

    Dear all, What does transalkylation disproportionation of toluene (stream from Benzene-toluene fractionator) result in? What is the reaction? Thanks
  8. rgrokkam

    characterise mixing

    I am interested in studying the effect of mixing. My experiment would be like compare * the reaction in a narrow channel and the reaction in a rotating tube.(no catalyst) In both cases, I will maintain the same temperature, pressure, residence time. Am I overlooking any other important...
  9. rgrokkam

    process flow diagrams

    Hi, I am new process engineer in refining. Can anyone suggest me link for tools/ softwares to generate process flow diagrams .
  10. rgrokkam

    plant design

    A plant is designed to produce hydrogen from Light naphtha. Feed is at 13000kg/hr. If I have to run the plant with a different feed ,say butanes will there be any hydraulic limitation. How should I go about investigating this?
  11. rgrokkam

    average particle size

    Hello For the vessel shown in the attachment, size of the particles is different and the liquid entry is from the bottom. I want to calculate the minimum fluidization velocity from Ergun equation. To estimate the average particle diameter, I doubt the use of sauter mean diameter. Can I use the...
  12. rgrokkam

    hydrocracker

    Is there any shortcut method to assess the performance of a hydrocracker(recycle type)?
  13. rgrokkam

    Air preheater

    To what temperature must the combustion air be heated in an airpreheater
  14. rgrokkam

    evaluating compressors

    I wish to evaluate the performance of a compressor(reciprocating & centrifugal). Can I compare the adiabatic head / polytropic head with design values. If I have enough cushion on this, can I say that the compressor can handle more volume of gases? Should I look at any other parameters?
  15. rgrokkam

    gasoline analyser

    I am looking for a sulfur analyser, to be installed in a gasoline line. The analyser should work in 350ppm-10,000ppm and a response time of few seconds. I've seen quite a few websites but I dont get the capital cost of such analysers. I need this info for a cost analysis. Can the forum help me...
  16. rgrokkam

    auto ignition temperature

    Is there any relation between auto ignition temperature and C-H ratio? Many thanks
  17. rgrokkam

    product despatch

    We send about 5-6grades of diesel(with varying Sulfur and flash point) through a single line, 15km long, from the refinery to the jetty. With wide variation in grades , the product goes offspec and we had to push some quantity to crude line at the jetty. Can anyone in the forum share their...
  18. rgrokkam

    Continuous catalytic reforming

    What is "pinning" in CCR Thanks
  19. rgrokkam

    quench in sulfur recovery unit

    In a sulfur recovery unit(from -amine acid gas and sour water stripper acid gas), the exit gas from BSR at 344degC goes to a quench column where it is cooled to 40degC. There's caustic circulation in this column as well. The quenched gas is again reheated to 190degC before sending to 190degC...
  20. rgrokkam

    visbreaker furnace

    I read something like this "....unsuccessful in steam air decoking of visbreaker furnace. An iron oxide layer had formed on top of coke and shielded it. Reduction step with hydrogen is now often used prior to final steam air decoking." Can anyone explain- 1. how iron oxide forms above the coke...

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