6 replies to this topic

[TechExpert]

Dear All

 

For burning acid gas containing H2S, which is better a Sour Flare system or an Incinerator?

 

No doubt, that in Incinerator, the acid gas is burnt in a controlled and more efficient manner, destroying all H2S completely.

 

Is there any feedback about Incinerators, that they are not reliable? They need a lot of maintenance and are normally down.

 

If Incinerator is down, then where to send the sour gas? If we put only incinerator and no sour flare. (or just shut the plant down).

 

Appreciate your comments/replies.

 

Regards

 

PKS

[fallah]

PKS,

 

I would prefer at first recovery of sulfur in SRU, then burning the tail gas in an incinerator...Also the relevant flare should be compatible with the acid gas to receive it in SRU/Incinerator shutdown without any problem...  

[TechExpert]

Fallah!!

 

We dont have SRU here, its Gas Plant where C3/C4/C5 are liquified. Amine system is there to remove the Acid gases.

 

Sour Gas is to be sent through Sour flare system only and cannot be sent to normal flare.

 

My question is:

 

Is there any feedback about Incinerators, that they are not reliable? They need a lot of maintenance and are normally down.

 

If Incinerator is down, then where to send the sour gas? If we put only incinerator and no sour flare. (or just shut the plant down).

 

Thanks

PKS

Edited by PKS, 18 June 2014 - 06:29 AM.

[RockDock]

As long as it gets hot enough and there is enough O2 and enough mixing, you should be okay either way. I suggest generating a ProMax model of it to know how much fuel gas and air to feed to it. Other than that, I think it is fine either way.

[Kriss]

_PKS,

 

_{I will share my experience in my last project.}

_{Usage of Incinerator or, Flare is depends on the Nox, SOx emission required per environmental regulation for that region. Normally continous Sox emission more than 400 ppm in any region is not accptable.  You can use flare if the Nox emission is less than 400 ppm. In my last project, Sox emission is high. So we use incineator as a primary and Flare is back up.}

 

_{After incineration of acid gas we used a scrubber to limit the SOx emission to the environment.}

_{Hope this will help.}

 

_Krishna

[TechExpert]

Thanks a lot Krishna

 

I have doubt for the reliability of Incinerator. I have heard that these need a lot of maintenance. 

 

In our case, in normal operation, the acid gas (from amine regeneration system) will be re-injected in the formation, by an acid gas compressor. So, only in case the Acid Gas Compressor is down, we need flaring or incineration. 

 

I want to know is it true that Incinerator really need frequent shutdowns for maintenance? Because we are using Incinerator instead of sour flare. 

 

Please put some light of experience on this.

 

Thanks

PKS

[Kriss]

PKS,

 

We really not received any feed back from our client regarding the reliability issue, no major shutdown so far. So far as i know Refractory failure is critical, this may happen any time. So in our case we have taken extra care by developing a procedure for the refatory dry out and installation carefully.

 

I believe that you have to check the following in your case:

1. Sox emission limitation ( if its too high, then can not flared for long time)

2. Normally, the incinerator are used for continous operation. If the shut down of compressor for very short time and the Sox emission is under control, then acid gas can be flared during the acid gas compressor shut down.

 

Dear Other mebers,

 

Please advise if my understanding is correct.

 

krishna

Edited by Kriss, 19 June 2014 - 07:12 PM.