[Gasification] Steam Turbines

[Peter & Kerry]

Hi Liran,

The 2 second combustion requirement is an Interesting and slightly 
disturbing prescriptive regulator response (that narrows gas use 
options), is somebody in authority just guessing and being cautious or 
is it based around actual gas analysis results from your plasma 
gasification system?

What potential constituents in the gas stream are these requirements 
aimed at?

In regard our own experience with gasifying hazardous waste (sewerage 
sludge with potential heavy metal contaminants, particularly mercury & 
cadmium) the client at the time for this (a large public authority) 
would not pay for direct emissions testing covering these so we paid out 
of our own pockets for an indirect "indicator" measurement, getting a 
ultimate analysis of the raw feed stock and the same test on the ash 
collected from the test run, then had a industrial chemist review the 
results. This showed the metals identified in the original analysis were 
captured within the ash in equivalent amounts relative to the mass 
reduction from the original sample (so didn't travel out with the gas).

Is this a problem with Plasma gasification? Are such contaminants 
mobilised in the gas instead?

We are currently engaged in the early stages of a formal testing project 
involving MSW and other hazardous wastes that will have EPA oversight 
and permitting for the trial. The results from this will inform pilot 
commercial scale system design and operating parameters in regard to 
emission management for our own system, so we are interested in what 
other regulator agencies are thinking in regard general gasification 
issues that might be flagged along the way.

Otherwise we would agree with Pannierselvam's question. Certainly 
subject to your gas meeting all the requirements for gas turbines (not 
just energy content) then these combined with downstream HRSG steam 
units using this exhaust, perhaps augmented with some  auxiliary firing 
if needed, could be another way to meet your regulatory requirement.

At the moment we are unaware of any commercial fuel cells that wouldn't 
require a high level of gas polishing and separation without quickly 
poisoning the cell, but also would love to hear more.

Regards,
Peter

Peter Davies
Real Power Systems Pty Ltd
Australia


Steam Turbines

Liran Dor liran at eer-pgm.com
Sat Feb 11 13:26:27 CST 2012
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Dear Pannierselvam,

Thank you for your reply

The reason for the rankin cycle is that due to the fact we are treating 
hazardous waste the environmental regulation dictate we combust the gas 
in a chamber with a 2 second residence time.

I do like your approach for the MSW application we are working on and 
would like to hear more about it.

Thanks

Liran