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Recent content by threeS

  1. threeS

    New Zealand LNG/NG

    In New Zealand, are LNG/NG classified as Hazardous Substances? Is NG Class 2.1.1A? Is LNG Class 3.1A?
  2. threeS

    UK Statutory Instrument - Threshold Quantity of Hazardous Substances

    JLSeagull, Thanks. SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982" has not been posted on OPSI. But I have downloaded from my friend through UK law library, which pre-registration is required.
  3. threeS

    UK Statutory Instrument - Threshold Quantity of Hazardous Substances

    JLSeagull, Thanks. To start my research, I need SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982"
  4. threeS

    UK Statutory Instrument - Threshold Quantity of Hazardous Substances

    Hi, all, I am looking for the threshold quantity requirement of hazardous substances. Please see whether you have ideas on the following for UK requirements: 1. It appears that SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982" has not been posted on...
  5. threeS

    Air or Water-Cooled Air Compressor

    quark, David, rmw, crjones, jay165, Montemayor, Thanks. Based on your posts, it can be concluded that the key factors for deciding the type of compressos are price and ambient temperature. Since the air compressors will be installed in the tropical region, water-cooled is therefore better than...
  6. threeS

    Air or Water-Cooled Air Compressor

    I am now selecting the Air Compressor for a new power station. The expected capacity of Air Compressor is around 7 bar and 50m3/min. The Air Compressor (two-stage) will be screw type with intercooler and aftercooler. We require the water-cooled Air Compressor but the Bidder counterproposed...
  7. threeS

    HRSG / Deaerator Design

    I found there are three different arrangement for the Deaerator in a Combined Cycle Power Plant: 1. Deaerating Condenser - Deaerating process is carried out inside Condenser. 2. Low Pressure Drum Deaerator - Deaerating process is carried out insde the LP drum. 3. Separate Deaerator -...
  8. threeS

    EP, Bagfilter, Gas Cooler

    Referring to the thread below, http://www.eng-tips.com/viewthread.cfm?SQID=81007&SPID=794&newpid=794&page=1 My project has new delevopment. We will focus on the following measures to reduce particulate emission from a coal fired power plant:- 1. Retrofit an additional cell upstream of EP...
  9. threeS

    Coal Fired Boiler - Gas Cooling between Air Heater and EP

    Thanks to all valuable advice. Having taking a bit more study, I want to summary below: Target of my task: To reduce the dust emission to ambient, or to reduce gas temperature from around 145 degC to 125 degC so as to increase EP efficiency. Plant: 20-year 250MW coal fired boiler with...
  10. threeS

    Coal Fired Boiler - Gas Cooling between Air Heater and EP

    Thanks to Heula, dew point is really a concern. Other than the wet scrubber, any other equipment available in the market.
  11. threeS

    Coal Fired Boiler - Gas Cooling between Air Heater and EP

    The second solution should be "cool outlet gas" instead of "heat it up". For the questions raised by yogibear1, I will address later. To davefitz, do you have any idea to cool down outlet gas? and why restoring the air heater performance is the best solution? Thanks
  12. threeS

    Coal Fired Boiler - Gas Cooling between Air Heater and EP

    As our coal-fired boiler has operated for 20 years, the air heater efficiency drops, the gas temperature leaving the air heater has increased by around 15 degC. This deteriorates performace of Electrostatic Precipitator downstread of air heater. Two possible solutions:- 1. Restore air heater...
  13. threeS

    Questions on HRSG design

    davefitz: Thanks I agree Items a-c. Item d: According to my knowledge, all HP, IP and LP economizer feedwater control valves are located at outlet of economizers. Why such arrangement can reduce cyclic fatigue? I agree Items e & f Item g: Do you refer to vertical HRSG ? Item h: In ASME...
  14. threeS

    Questions on HRSG design

    thanks to everyone giving your valuable advice. The HRSG I specified is triple pressure with reheat. The HP steam temperature and hot reheat temperature are around 566degC. So I think it is appropriated to specify the T91 for final superheater and reheater. Regarding vertical or horizontal...
  15. threeS

    How to specify supplementary firing equipments for HRSG

    To athomas236 Thanks your advice let me clarify the suitation I face. I am writing a specification for a combined cycle plant. According to suppliers' preliminary documents, our required power output may not be achieved without a supplemenary fired HRSG. So some of suppliers have...
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