June 21, 2018 at 8:54 am #28655
Dear Coking members,
High content of solid particles in Delayed Coker feed can cause accelerated fouling in the furnace.
Has anyone experience on how to measure solid particles concentration and particle size in vacuum residue? I have seen the use of laser difraction or particle counter for other products (kerosene, lubricants, etc) but I am not sure if this could be succesfully applied to vacuum residue.
What is the maximum solid concentration recommended to avoid fouling issues?
What is the maximum solid particle size recommended?
Thank you in advance for your help
June 21, 2018 at 3:34 pm #28660
We apply a methodology that consist on a solid separation from the vacuum residue, you have to take a small sample of the coker feed and make a separation using a cone (Centrifuge Tube, Oil, 100 mL, Short Cone) where you put 50 ml of vacuum residue and 50 ml of Toluene, homogenize the components and when the residue is totally dissolved, the Centrifuge tube is put in a Centrifuge at 1500 rpm and 20 min, the solid will be at the bottom of the cone, discard at least 80 ml of the initial sample taking care of maintain the solids in the bottom, then you fill up again with toluene, homogenize (agitation) and put the tube in the Centrifuge again till the solid be clean. When the solids are cleaned you put in a muffle at 80 Celsius for 3 hours.
You have to do this procedure several times to collect enough sample (solids) and send the solids to a particle size determination. If you want a more technical explanation in a better English you can consult the ASTM D4072 norm, however we use it with small modification only with the intention of obtain the solids.
We have a device where you put 10 grams and give you the particle size curve.
June 25, 2018 at 12:36 pm #28665
Thank you very much for the information provided.
Regarding the device to measure the particle size distribution, do you know which kind of equipment / method you use? Is it absed on laser difraction measurement (like Mastersizer equipment) or particle counter (like Beckman Coulter)
Appreciate your help.
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