6 replies to this topic

[Acad]

Hi, I am looking for kinetic data for the following equation and condition to design a Pyrolysis Gasifier. For MOBIL Methanol to Gasoline plant. Is there any possible information available to design the pyrolysis gasifier.

4C + 2H2 + 1.5O2 <-> 3CO + CH4
Estimated mass flow = 1201 kg/hr
Pressure = 1800 kPa
Temperature = 1280 C

Is it possible to design single fixed bed type reactor? Would downdraft gasifier be appropriate? Your opinions and suggestions will be taken positively.Thank you.


Achieving simplicity is not that simple, =)

Acad

[kkala]

Relevant data can be hardly retrieved from Web, following could be probably of some help.
http://alexandria.tu...2/200411302.pdf
http://www.anl.gov/P..._04-89_0079.pdf.
http://www.sciencedi...016236109002658
Having contacted a lignite gasifier only once (1969), I do not have knowledge on the pyrolysis gasifier with a (catalytic) bed. May somebody else give you specific information on this matter (mainly applied to biomass, as I understand).
I agree that effort is needed for anything to be simple (or simpler). Good luck.

Note: Furter search in Web indicates that mentioned process concerns a gas synthesis to prepare (in stages, including shift conversion) methanol as a raw material for hydrocarbons http://en.wikipedia..../Gas_to_liquids.

Edited by kkala, 12 September 2011 - 10:30 AM.

[Acad]

Dear Mr Kkala,

Thank you for you reply. Is there any heuristics in designing a gasifier? what the steps in sizing, doing process design and mechanical design for a gasifier? where could i get the information from? i could not get information regarding gasifier in Sinott or Coulson and Richardon reference books. i have selected entrained-flow gasifier design for my gasifier due to exit gas temperature of 1280C and the main product is CO gas for water gas shift reaction later on. Please advice on where to get information regarding detailed designing of entrained flow gasifier. Thank you for your time


Regards,
Acad

[kkala]

Some general info concerning coal gasification and litterature can be found in previous thread http://www.cheresour...h__1#entry36863, though it may not involve "entrained flow" or "pyrolysis" type. You may be interested for gasification of non coal compounds, which may have some distinct "peculiarities", even though the whole process is not expected to have important differences in general.
I had understood that the melting point of resulting ash plays a significant role, since this has to be lower than 1280 oC in your case.
Useful could also be http://www.cheresour...h__1#entry46648, http://www.cheresour...h__1#entry46904, http://www.cheresour...h__1#entry50042.

Edited by kkala, 21 September 2011 - 03:45 AM.

[kkala]

Dear Mr Kkala, Thank you for you reply. Is there any heuristics in designing a gasifier? what the steps in sizing, doing process design and mechanical design for a gasifier? where could i get the information from? i could not get information regarding gasifier in Sinott or Coulson and Richardon reference books. i have selected entrained-flow gasifier design for my gasifier due to exit gas temperature of 1280C and the main product is CO gas for water gas shift reaction later on. Please advice on where to get information regarding detailed designing of entrained flow gasifier. Thank you for your time Regards, Acad

Edit note by kkala: Please explain reason of negative feed backs on posts by kkala dated 12 sep 2011 and yesterday (probably 21 Sep 2011). The latter responded to your post dated 20 Sep 2011.

[Acad]

Dear Mr Kkala,

The reason why i gave negative feedbacks, is due to the replys you givebacks didnt not actually answer my question. Nothing personal. I am still looking a for methods or assumption of which i can use to deisgn a biomass gasifier. For instance, like the one in biomass gasification and pyrolysis book by basu. But the details gave in the books are not sufficient.

Regards,
Acad

[kkala]

Dear Mr Kkala, The reason why i gave negative feedbacks, is due to the replys you givebacks didnt not actually answer my question. Nothing personal. I am still looking a for methods or assumption of which i can use to deisgn a biomass gasifier. For instance, like the one in biomass gasification and pyrolysis book by basu. But the details gave in the books are not sufficient. Regards, Acad

Acad, my counter arguments are as follows.

• You should have given adequate explanations on the subject, more than what your above three posts include, so that anyone a bit familiar with gasification would understand. I suspected biomass gasification only after searching the web. Probably somebody familiar with “pyrolysis gasifier”, “fixed bed type reactor”, “downdraft gasifier” could offer help, but you see this has not been realized so far.
• I stated inability to offer specific information on this gasification type. But you asked me again for data. The response was limited to references for coal gasification you might find useful, and this was clarified. That developed temperature should be lower than melting point of resulting ash is significant for every gasifier type, in my opinion.
  If you would comment on the remarks / web references of my first post and give explanations, some points could have been promoted by me or somebody else. This way is not unusual in forums, we all learn from a subject.
• Your response to my first post (Thank you for your reply..Thank you for your time) contradicts the negative feedback placed later. Any problem should have been clearly expressed there. Two negative feedbacks at same time for same object are indications for hot mood rather than objectiveness.
  
  Read para 3 in the pinned post “Guidelines for Posting Questions”. If you happen to manage people in your career, may you remember the present post.