[Gasification] [Bioenergy] Biogas info

[Tom Reed]

Dear All:

Thanks to Kevin for suggesting simple orifice plates for measuring gas 
flow.  You can find lots more detail in the "Chemical Engineering 
Handbook", should be available at any library.

To measure the pressure drop use a Dwyer Magnahelic gauge and keep the 
pressure drop low with large orifices so that a 0-0.5 inch gauge will be 
adequate, since the pressure drop subtracts from system pressure.  . 

If your gas is clean you can use Venturi meters.  They recover > 90% of 
the pressure drop.

TOM REED   BEF

Kevin Chisholm wrote:

>Dear John
>----- Original Message ----- 
>From: "John Flottvik" <j.flottvik at jfwasteenergysystems.com>
>To: "Kevin Chisholm" <kchisholm at ca.inter.net>; <Bioenergy at listserv.repp.org>
>Sent: Wednesday, August 30, 2006 10:59 AM
>Subject: Re: [Bioenergy] Biogas info
>
>
>  
>
>>Dear Kevin.
>>
>>Thank you for your suggestions. One more thing,, will tar build-up 
>>interfere with the pipe flanges thus giving a false reading?
>>    
>>
>
>It is difficult to say... depends on the rate of tar buildup, and the degree 
>of tar buildup. The tar build-up at flanges is not so much a concern as 
>would be build-up of tar on the "educated hole", and in the pipe immediately 
>prior to the orifice plate. My guess would be that over a "long period", tar 
>could be a problem, but that over a "short period", it would not be a 
>problem. At any rate, it is such a simple way to measure gas flow that it 
>would be a good bet to try it. Indeed, if tar buildup is going to be a 
>problem, an orifice plate is probably the cheapest and easiest way to deal 
>with it.
>
>If you construct the piping with a removable spool piece, you can easily 
>take the system apart to check for tar buildup, and cleaning as required.
>
>  
>
>>So far I am very happy the biogas burn in the reactor ( shared photos with 
>>Tom as attachments are not excepted) but we need the volume to present to 
>>potential buyers.
>>    
>>
>
>Very good!!
>
>Best wishes,
>
>Kevin
>  
>
>>Thanks again for your help.
>>
>>John Flottvik
>>www.jfwasteEnergySystems.com
>>
>>----- Original Message ----- 
>>From: "Kevin Chisholm" <kchisholm at ca.inter.net>
>>To: "John G. Flottvik" <jovick at shaw.ca>; <Bioenergy at listserv.repp.org>
>>Sent: Tuesday, August 29, 2006 8:40 AM
>>Subject: Re: [Bioenergy] Biogas info
>>
>>
>>    
>>
>>>Dear John
>>>
>>>I would suggest that you should measure material fl;ows and energy states 
>>>at each point in your process flow sheet. That way, you can do a Mass and 
>>>Energy Balance, and find where your process is performing adequately, and 
>>>where there is an opportunity to improve it.
>>>
>>>Gas flows, at virtually any temperature or pressure, can be measured with 
>>>a simple Orifice Plate. Basically it is simply two pipe flanges with a 
>>>plate having an educated hole in it. You measure the differential 
>>>pressure across the orifice plate, and then you can calculate the gas 
>>>flow rate. If this is simply a test station, you can make up a table for 
>>>each location, read the "delta P", and then translate the "delta P" 
>>>directly into CFM, or the units of your choice. If you wish to use the 
>>>point for process control you can easily get instrumentation that will do 
>>>this for you and send the information to its point of use. Any 
>>>Instrumentation Supplier can do the calculations for you, and supply you 
>>>with the relevant hardware.
>>>
>>>Best wishes,
>>>
>>>Kevin
>>>----- Original Message ----- 
>>>From: "John G. Flottvik" <jovick at shaw.ca>
>>>To: <Bioenergy at listserv.repp.org>
>>>Sent: Tuesday, August 29, 2006 11:06 AM
>>>Subject: [Bioenergy] Biogas info
>>>
>>>
>>>Dear list.
>>>
>>>How would I measure the volume of gas (biogas) derived from our pyrolysis 
>>>process?
>>>Are there flow meters of some kind suitable for this type of gas?
>>>Should we measure this gas after the condensers which will have the more 
>>>refined product or before the condensers before rendering it into bio-oil 
>>>when everything is a gas/tar/creosote/etc?
>>>To take gas quality samples and send to a lab for analysis is no problem, 
>>>but measuring volume is. Any suggestions will help.
>>>
>>>Regards.
>>>
>>>John Flottvik
>>>
>>>www.jfwasteEnergySystems.com
>>>
>>>      
>>>
>
>
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>