Electric incinerator

[shvet]

Hello everyone

We are dealing with process design of caustic treatment of LPG from mercaptans. Our issue concerns spent air of caustic regeneration. We have no fired heater nearby to route this in firebox and would not like to use fired incinerator. Please advice links to options:
- an incinerator with electric "burner" instead of fired one
- treatment on a small separate open elevated flare
Please note that spent air flowrate is 50-200 kg/h and it contains only traces of VOC and we do not need high degree of destruction as low odor threshold of disulfides is the only issue we faced. We are currently modelling a emissions dispersion to find out limits. But currently I would suggest 98% destruction is enough. It is unlikely will be more 99%.

P.S. Activated carbon and chemical adsorbent options were already rejected.

 

[georgeverghese]

How far is the nearest fired heater where you can combust this stream ? - this option would be ideal if piping can be made self draining.

 

[shvet]

We know. Possible options related for firebox were studied and rejected by Decision Makers.

 

[pierreick]

HI,
have a look:

https://www.cdmsmith.com/en/Client-Solutions/Insights/Odor-Eating-Microbes-Improve-Air-Quality

Pierre

 

[shvet]

@pierreick
"The bug of choice is the thiobacillus—small bacteria that call sewage or soil home and reduce hydrogen sulfide into odorless sulfate. In this form of a biotrickling filter, thiobacillus-covered sponges are installed in what used to be a chemical scrubber. Certain conditions, such as proper moisture, pH, temperature, and pressure, must be maintained within the scrubber to keep the microbes functioning optimally."
We considered biofilter and decided that cost of conditioning might be the most expensive option. Unpredictable pathogen threat was another reason to reject this option as there are no proven references for use in our type of process. Negative experience in bioengineering concerned BP's Deepwater platform was a strong argument.