CHP

f0ster

Member
a different grade of steel will cure it but it will be expensive. solar focus boilers have a very high burn temp of well over 1000 deg, the burner grate of these is a special mix of stainless that lasts about 12 months even at these temperatures, we tried a standard of grade of stainless 10mm thick to make the grates out of but they were burnt out in two months.
 

renewablejohn

Member
Location
lancs
Maybe from an operational point of view but not from an efficiency one. And this is getting more important as the price of timber goes in one direction.

Thats why ORC is important as it accepts multifuel. In my case biomass,woodgas,solar and heat recovery. Also thermal oil is useful for direct heating as well as power generation.
 

Fowler VF

Member
Location
Herefordshire
a different grade of steel will cure it but it will be expensive. solar focus boilers have a very high burn temp of well over 1000 deg, the burner grate of these is a special mix of stainless that lasts about 12 months even at these temperatures, we tried a standard of grade of stainless 10mm thick to make the grates out of but they were burnt out in two months.

Not necessarily. High grade steel was the cause of the problem in the Frohling. See my earlier post. Steel too good, didnt move enough and cracked. Fire brick liner was my suggestion in my report to the user group, that's what Frohling now seem to have done. Spanner did the same a while back.

Definitely higher burn temps in uk, maybe the force drying, maybe timber type and growing conditions? dunno.

Yes Entrade gone bust. Ran OK apparently, but had to use pellets.
Agree with Volter comments, they seem to have stuck with it and got it much better. The early ones were poor, manual lighting involved tipping a bucket of hot charcoal down the feed chute! cracked reformers were an issue, but I am told that they have been round them all and retrofitted major improvements.

All pretty irrelevant now, this game is pretty well over for any new installations, of any make on a financial return basis.
 

Gentrend

New Member
Hello everyone,
I thought I would put my two pennies on this forum. I am an electrical engineer who has around 10 years experience in working on generators and CHP units. I have worked for 4 companies in generation, with the most relevant being Edina, as they have loads of CHP on farms around the country being run on biogas. I

I thought I would try answer some points based on my experience.

I think reliability of CHPs generally are good. If I recall correctly, on Edina's service contract they would guarantee 90% running on their service contract, and there was some form of penalty if they did not achieve it. I understand a service contract can be expensive route to go down, but in my opinion is a sensible way to go.

Generally CHPs can be setup in two way: power demand led or heat demand led. On heat demand led the units modulates its power output to achieve the power output.

Obviously not knowing your location on the Scottish Borders, an option I have seen is to sell any excess heat to a nearby factory.

CHP generally works on the principle that your output (electricity and heat) is cost effective based on your fuel in(I am sure plenty of you could word that a whole let better than me. In my opinion natural gas is a better much better option than biogas as the process required for a good quality and stable gas can cause as many issues. When at Edina, more often than not, getting the engine going again after a routine service could be as big as the original job. If the gas is not right it causes all sorts of issues in the gas train and in the engine. Natural gas is so much easier to work with but obviously location of unit could mean natural gas is not an option.

When testing a 100kw generator in my current companies test cell, the unit ran with 29mbar. Depending on engine generally pressure over 25 MBAr is required

I hope this helps
 

Chris Kohut

Member
Trade
I run six Spanner CHP's, 50kw electric each. Wood chip to syngas. Issue for you will be running them in "Island mode" if you don't have mains. You need 3 phase power to wind them up and you need to figure out a way of actually using what you produce at all times, the engines will put out the power constantly and it has to go somewhere. Need a very good electrician to figure it out for you, but it could probably be done.
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SFI - What % were you taking out of production?

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Red Tractor drops launch of green farming scheme amid anger from farmers

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As reported in Independent


quote: “Red Tractor has confirmed it is dropping plans to launch its green farming assurance standard in April“

read the TFF thread here: https://thefarmingforum.co.uk/index.php?threads/gfc-was-to-go-ahead-now-not-going-ahead.405234/
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