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  • Users: semarang
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  1. semarang

    Corrosion rate of sulphuric acid

    Thank metengr and rmw, That's right, I use the ljungstorm type. It made 20 years ago, and i'm not sure aboout the 8 % guaranteed leakage rate from its manufacturer. In the past 20 years, we use 114oC of cold end temp as our setting (dew point temperature), as the optimal temperature between the...
  2. semarang

    Corrosion rate of sulphuric acid

    Hi all, I have some difficulties to count the corrosion rate of sulphuric acid from the Boiler's flue gas. As we know, in the fossil fuel power generating system, we've to maintain the flue gas temperature above to the dew point of sulphur. Its dew point is depend on the sulphur content in its...
  3. semarang

    formulation of direct contact condensation

    Great thanks RMW, Just to make sure, the condition of my condenser, (also because of my limited ability :)), Do you know what is the phenomena behind the steam flow in the turbine and when entering the condenser? As I know, in the turbine section, there's a drop pressure and velocity of steam...
  4. semarang

    formulation of direct contact condensation

    Thanks again RMW, Of course if I re-design the spray I'll do the same thing as you said. But now, my manager just want me to count whether this spray (with its 3 atm supply pressure) have enaugh momentum to attain the exhaust steam. The spray is about 15 cm long. What we affraid of is, this 3...
  5. semarang

    formulation of direct contact condensation

    Thanks RMW, It will be about 3+1 atm. And this is my design pressure (limited by the available make up pump). By this differential pressure, I still can't imagine how the water spray can attain and mix with the exhaust steam, with the nozzle that I've choosen. On the other words, if I choose the...
  6. semarang

    formulation of direct contact condensation

    Thanks all, perhaps i want to refresh my question about this spray modification. I'm going to use the make up water for the spray with its 3 atm pressure. Is it enaugh for the droplet water to mix with the exhaust steam (at 45 MW load, steam flow is 180 tonne/hour)? Dwi Handoyo S
  7. semarang

    formulation of direct contact condensation

    It's a down flow, with 46 MW full load. The make up is about 1 m3/h, and yes the flow is going to be continuous.
  8. semarang

    formulation of direct contact condensation

    Wow, great2 comments, thanks RMW and byrdj, seems that hood spray's application need to be confirmed yet. From the discussion, in no or low load the spray could harm the turbine and condenser's tube itself. But, before we made a conclusion, there is one information. My hood spary's arrangement...
  9. semarang

    formulation of direct contact condensation

    Thanks RMW, My condenser is in south east asia (ekuatorial), we use sea water as the CW. N here're the annual average data (2003): CW : in = 33 oC out = 41 oC cond' vacuum = 668 mmHg Dwi Handoyo S
  10. semarang

    formulation of direct contact condensation

    Thanks RMW, your comment really inspiring me more. But there still one obstacle hanging in my head, isn't sure that the spray water won't make an erosion in last stage turbine, if we took it as close as possible to the axhaust steam? Or maybe, in the other word, if the 30oC droplet water...
  11. semarang

    formulation of direct contact condensation

    Thanks RMW, My problem is in 30 years old surface condenser. To increase its vacuum performance, I want to use spray water into the hood spray sistem, to decrease the steam temp. First Spray water that I want to use is 32oC n 3 bar, from the make up water system. The exhaust steam is 53oC...
  12. semarang

    formulation of direct contact condensation

    Hi all, I have some difficulties finding formulation for direct contact condensation process. In our condenser, we trying to fix its vacuum by reducing the exhaust steam temperature, using a sprayed water. Is there any formulation that can explain this wacky idea? Thanx. Dwi Handoyo S
  13. semarang

    Soot Blower

    Dear all, I have a trouble finding the steam flow required for soot blower operation in 200 MW boiler. Please, I really need your help. Thanks Dwi Handoyo S
  14. semarang

    How to raise condenser vacuum?

    Thanks for the valuable respond to Mr. 25362 and Mr. RMW. To RMW, your statement about spray header system interesting me. Maybe you can send me (dwihandoyo03@yahoo.com) more information about it especially on its technical aspect? Dwi Handoyo S
  15. semarang

    How to raise condenser vacuum?

    Thanks to all the respond. It seems very impractical for lowering the condenser pressure by hood spray in this 20 years old condenser. Isn't it? But if we try to see in its heat transfer point of view, is't still impractical to use hood spray's supply (who reach 32 C) for lowering the 46 C steam...
  16. semarang

    How to raise condenser vacuum?

    Thanks for ur reply, Mr. 25362 and Mr. davefitz. I've already checked the air extraction equipment of condenser. All is on a good operating condition. To davefitz, what u said is true, I've been plotting the vacuum with the temperature of cooling water. More bigger the temperature, so the...
  17. semarang

    How to raise condenser vacuum?

    Hi all. I've got an issue about how to raise the condenser vacuum by reducing the exhaust steam temperatures, who come as the Temperature hot inlet of condenser. Is it really true, that if we can reduce the temperature of steam that will condense in condenser, so the vacuum of condenser will...
  18. semarang

    Characteristic 70-30 Cu Ni Tube in HP feedwater heater

    Thank's for all your reply. These help me much. Dwi Handoyo S
  19. semarang

    Drain pipe

    Thank's 4 the reply Mr. Pump Designer. I believe that the phenomenon is come from the malfunctioning control valve. We use CRV with positioner. The CRV's positioner is to wide to close, the closing stroke is too long. So, there is a moment with no flow at all (in an extreme condition). Is there...
  20. semarang

    Drain pipe

    Hi all, I've got a problem in drain pipe that goes to"dance". In our desal plant, there is a brine pump in brine heate who pumping the condensate that formed. The discharge pressure of the pump is varies from 3 - 4.5 bar. Normally its operation condition is 4.5 bar. These pressure...

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