|
|
|
|
|
|
| |
Subject : Hydrogen Steam conductivity |
| |
In our Hydrogen Plant (Steam Reforming) we are getting conductivity of steam @ 11000. Continuous blow down from steam drum conductivity is 50-60 only. Our steam drum is operating under three element control. Due to bad quality of steam we are facing chocking of transmitters. Now we have taken two steps to decrease steam conductivity.
1. Cold separator condensate completely routed to OWS.
2. Hot separator condensate partially routed to OWS.
Due to above steps DM water consumption increased. Degasifier we are operating at 0.2 to 0.3 barg pressure and BFW temperature maintaining @ 106- 108 degC.
By draining above two vessel surely conductivity come down because of fresh DM water make up increased. (DM water conductivity always less than 0.5.) So is there any alternate method to reduce steam conductivity without draining condensate from cold separator and HOT separator?
Number of responses: 0
|
|
|
|
|
| |
Subject : Atmospheric Column |
| |
Why is an atmospheric column so called? Is there any special reason?
Number of responses: 2
|
|
|
|
|
| |
Subject : Gasoline merox |
| |
We added Dorf Ketal for prevention of gum formation, but we don’t know which calculations are involved. Please also provide formula for concentration of Dorf Ketal.
Number of responses: 2
|
|
|
|
|
| |
Subject : H2SO4 Alkylation |
| |
We are looking at options to reduce the tail end (iC12+ or meterial boiling above 195deg C) in our Alky unit, which is fed by mixed C4s stream from FCC, Coker and Butamer. The Cat used is H2SO4 and it is auto refrigerated unit. The looked at the typical opeerating variables viz. I:O ratio, reactor temp, Acid conc, Isobutylene to Olefins ratio, etc. Not much improvement. Can some one throw light on other elements which could influence longer tail in Alky product.
Number of responses: 1
|
|
|
|
|
| |
Subject : Rate of heating and cooling during Reactor Start up-Shut down |
| |
Could anyone please tell me how to calculate Rate of heating and cooling during Reactor Start up-Shut down and MPT (Minimum Pressurization Temperature) calculation?
Number of responses: 0
|
|
|
|
|
| |
Subject : FCC slurry feed exchangers - Use of tube inserts |
| |
Has anyone having any experience of using tube inserts in Slurry/Feed exchangers in FCC? Slurry is on tube side. Please share your opinion, if tube inserts may help improving heat transfer when tube side slurry velocity is about 1.5 m/s. Is there a possibility that due to catalyst presence in slurry it may plug the tubes when inserts are used?
Number of responses: 2
|
|
|
|
|
| |
Subject : Sea cooling water line hot tapping: FCC |
| |
One of the 48" cooling water line has debris filter (horizontal conical strainer), supplies to FCC main air blower turbine surface condenser. Since this is getting choked slowly, air blower capacity is getting limited. Has anybody experience of Hot tapping in sea cooling water line to provide a bypass. Or some technology where this strainer can be cleaned on line. This cannot be backflushed, has only 1" drain.
Number of responses: 0
|
|
|
|
|
| |
Subject : Sulfur content of FCC spent catalyst |
| |
FCC feed sulfur content is about 1.8 wt%. What is the approximate range of sulfur content of spent catalyst? 0.2 wt% sulfur content on spent cat is reasonable or it should be 0.02 wt%. It would be helpful if someone can share feed sulfur and spent cat sulfur data of some FCC unit.
Number of responses: 1
|
|
|
|
|
| |
Subject : FCC CO Boiler expansion joint |
| |
CO boiler equipement has one horizontal bellow having 14 feet dia, which got leaked (greenish acid) due to corrosion on bottom part.
Metallugy is SS 304L, and it is single convolution. Does somebody has experience to provide purge in single convolution or how to keep it hot above 200 deg c?
Number of responses: 1
|
|
|
|
|
| |
Subject : Temperature Control across Exchnager |
| |
Just want to get your view on this.
We want to control the temperature across the Heat Exchanger which is a part of Preheat-Train.
There are two final control elements we find to control the temperature across a Heat exchanger.
1. Providing a three Way control valve which will be located on the line, one inlet port shall receive the process fluid, two outlet ports shall send the fluids to Exchanger and Exchanger by-pass respectively.
2. Providing two control valves, one is towards Exchanger and the one is on the by-pass. The temperature controller works by closing one valve and opening the other one.
In the second option, we find some safety concern as the possibility of ‘shutting’ of both the valves exists. Have anybody observed this kind of scenario while.
[In that way it calls for safety valves for shut-off.]
Number of responses: 1
|
|
|
|
|
|
|
|
|
