[Gasification] Gasification Digest, Vol 17, Issue 10Re: anaerobicc digester gas for IC engine

Murali Krishna bmkrishna6 at gmail.com
Thu Jan 19 23:25:00 CST 2012

Dear David,

We have been using crude biogas (without purification) for running 15 KVA
Generator.. This generator has been running at our farm for more than 5
years at 8 hours a day without any problem. Should you wish I shall send
you the photographs  The feedstock for generating biogas is cow dung.  Not
only at our farm we have been running such 22 to 25  similar units in
Hyderabad, Andhra Pradesh, India at different locations.  All these
generators are run on crude gas (at methane 55-60 per cent) for the last
four to five years.  We observed that for  every one cube meter of crude
gas 1.6 Kwh of power is generated on the generator.  As dung is a byproduct
and in view of high cost of purification many medium scaled  dairies are
not preferring Natural Gas Engines that run on purified methane 85%+.  Our
observation is that for larger plants 2000 m3 and above, Natural Gas
engines that giver 4 KwH per m3 are economical on the long run.

As Dr. Karve has said we are running biogas generators on crude gas without
purification and facing any mechanical trouble.  All these  engines are not
overhauled in the last 4 to 5 years. Average running is 8 hours a day for
farm irrigation application.


On Fri, Jan 20, 2012 at 8:16 AM, Anand Karve <adkarve at gmail.com> wrote:

> Dear David,
> I do not have day-to-day experience because it is my colleagues at our
> research and training centre at Phaltan (about 100 km from Pune), who
> operate these systems. So far there have not been any complaints about
> extra cost of maintenance. And even if the cost were to be higher, it would
> be offset by the saving in the fuel cost. We produce our own biogas from
> the food waste generated in our own hostel and from green leaves plucked
> from the trees on the campus. Therefore, biogas is free of cost.
> Yours
> A.D.Karve
> On Fri, Jan 20, 2012 at 8:05 AM, David Coote <dccoote at mira.net> wrote:
>> Hi Anand,
>> How do you find engine maintenance requirements running on biogas as
>> against running on diesel?
>> Thanks
>> David
>> Message: 2
>> Date: Thu, 19 Jan 2012 12:27:58 +0800
>> From: Anand Karve<adkarve at gmail.com>
>> To: Discussion of biomass pyrolysis and gasification
>>        <gasification at lists.**bioenergylists.org<gasification at lists.bioenergylists.org>
>> >
>> Subject: Re: [Gasification] anaerobicc digester gas for IC engine.
>> Message-ID:
>>        <CACPy7Sd8upLZ68jwQpnsip4mU80w**aunCAaeN5WqZ4Ggu4p+muQ at mail.**
>> gmail.com<CACPy7Sd8upLZ68jwQpnsip4mU80waunCAaeN5WqZ4Ggu4p%2BmuQ at mail.gmail.com>
>> >
>> Content-Type: text/plain; charset="iso-8859-1"
>> Dear Phillip,
>> I have been running two engines for several years on raw  biogas without
>> cleaning it. One is attached to an electricity generator and the other one
>> is attached to our char briquette extruder. Please note that we are not
>> selling our biogas, but using it privately.
>> We make our biogas from high calorie food waste and green leaves. It
>> contains about 60 to 65% methane, about 34 to 40 % carbon dioxide, less
>> than 1 % H2s and NH3 and some water vapour. When one runs an internal
>> combustion engine, the air that enters the engine has about 80% nitrogen
>> and when it is raining outside, the air entering the engine is saturated
>> with water vapour, as in the case of biogas. The nitrogen, carbondioxide
>> and water vapour just dilute the fuel gas, but if the mixture contains
>> enough of the combustible gases, it can be used in an internal combustion
>> engine.  We are also using producer gas at another location to run an
>> electricity generator. Even the producer gas, which is used as fuel in
>> this
>> case, has nitrogen, sulphur dioxide, nitrous oxide and carbon dioxide.
>> Just
>> 25 years ago, the world used high sulphur diesel. It did not harm the
>> engine. The sulphur content in the fuel was reduced out of environmental
>> considerations. However, the environment need not worry a user of biogas
>> or
>> producer gas, because if the biomass does not get converted into biogas in
>> an anaerobic digester, it is going to rot outside the digester, in nature,
>> and release the sulphur and nitrogen in their oxidised forms  Both wood
>> and
>> biogas are being used as cooking fuel and they release the substances
>> mentioned above. If you used a mixture having 97% carbon dioxide and just
>> 3% methane, it won't be possible to run an internal combustion engine on
>> it. But with biogas and producer gas, one can. Removing the carbon
>> dioxide,
>> moisture, ammonia and H2S from biogas just adds to the operating cost.
>> Yours
>> A.D.Karve
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> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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Murali Krishna
Hyderabad, Andhra Pradesh, India.
Ph:+91-40-24339999, 24333333,243355555, 24333555

* **Never put water down the drain when there may be another use for it*
*Save the Environment*

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