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We would like to cool coker cutting/cooling water below the current 12

We would like to cool coker cutting/cooling water below the current 12

We would like to cool coker cutting/cooling water below the current 12

(OP)
We would like to cool coker cutting/quench water below the current 120 - 130 degF to reduce deheading vapor cloud and hot spot eruptions. 90 degF is the target. We are considering a stand alone, direct contact cooling tower, and recycling back to the coke pit maze. Is microbio fouling of the tower going to be a problem? We are also considering instead to divert relatively cold waste treatment feed water (storm, not process) as pit make-up and routing hot surface water to WWTP. Both options rely on temperature stratification in the sump. Any experience with cooling this water?

RE: We would like to cool coker cutting/cooling water below the current 12

I think that your cooling tower option is a much better bet. Trying to use collected storm water and depending on temperature stratification sounds a bit too convoluted. As for biological fouling in the cooling tower, don't you think that chlorine injection would take care of that just as it does in your other cooling towers?

Milton Beychok
(Visit me at http://www.air-dispersion.com)

RE: We would like to cool coker cutting/cooling water below the current 12

Cooling the quench water does not reduce the deheading vapor cloud and "hot spot eruptions". Quench water evaporates in the closed coke drum and is typically condensed/cooled in a closed blowdown quench tower system. Quench water supply temperatures range from 140-160F, thus your 120F is already lower than average.

When you remove the top head (prior to coke cutting), the vapor plume is best managed with an ejector to suck vapors away from the cutting deck.

Cooling the cutting water has no effect on "hot spot eruptions". Good steaming, quench and drain procedures minimize the potential for hot spots.

RE: We would like to cool coker cutting/cooling water below the current 12

As another thought, are you aware that there is a web site devoted completely to delayed coking?  The URL is http://www.coker com and you might do well to post your question in their message board.

Milton Beychok
mbeychok@home.com
Air Pollution Dispersion Modeling
Visit my website to learn about "Fundamentals of Stack Gas Dispersion", a most comprehensive book on dispersion modeling of continuous, buoyant air pollution plumes. The site has published peer reviews and the complete Table of Contents.

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