2 replies to this topic

[Lizette.Ryke]

Coke oven gas, refined by the gas treatment plant of the coke plant is recycled back to the coke oven battery in a 20 inch pipeline at a temperature of 25 - 30 degrees Celcius. At this temperature we are experiencing pipeline blockages of tar and naphthalene condensating and solidifying in the pipeline before entering the gas alley for the battery firing system.  This results in blocked heating nozzles.

 

The aim is to heat up the coke oven gas returning line to the coke oven battery to a safe temperature range.  (I.e. above the temperature causing its constituents to condensate and block the line, but still below the temperature which causes its constituents to near an explosive/ flash zone).

 

Does anyone know of an effective, controlled heating method of the coke oven gas? I am considering steam, but the temperature is so high, that a heat exchanger design might be economically not viable. (The steam is from the boiler at about 250 C).

[rama85]

yes ,,,,,i have used the steam for the same and put a shell and tube heat exchanger and raised the temp up to 60-65 Deg C ...but for that you have to put a PRDS in steam system you can use saturated steam at less then 200 deg ...and it will solve your jamming problem considerably ...One more thing your Blower outlet temp is very low i don't understand why it is 30.35 deg in outlet normally after exhauster it reaches 45 deg but you can add a little steam and raise the temp in outlet line as well and then just put a steam preheater for the Gas and it will solve your problem...hope this might help ...can you share your  PFD diagram so that i can have little clear view of your problem

[Guillaume Peltier NEXSON]

Dear,

 

In coke oven plant, we traditionnally use SPHE from Nexson, (Spiral heat exchanger)

This is a unique spiral flow channel which keep a uniform flow velocities to avoid blockage you get.

When it comes to gas heating, we use the same technology with low pressure drop advantage to avoid naphtalene solidifying. Most of the time hot water is enough to heat up your gas, as a spiral heat exchnager thermal efficiency is much higher than a S&T

 

http://www.nexson-gr..._9_lang_uk.html

 

We get as well case story for that application if you contact us.

I remain available

Guillaume