Gas Sample Analyser for CHP - fixed or portable?

Discussion in 'Renewable Energy' started by turbofarming, Jan 11, 2017.

  1. turbofarming

    turbofarming Member

    So 6 months into having our CHPs we have just been told we need to sort out a gas analyser solution for weekly readings.

    Bit of a shock as were originally told we would not need one but looks like registration wont be completed until ones is in and running.

    Has anyone got any suggestions or recommendations, they are serious money from having a quick look.

    Currently we are looking at either 1 fixed analyser unit with pipes on a T to both units, or a portable option. Both would require weekly attention, but apparently we could spend an extra 3k ish on another fixed unit and only have to check them monthly.

    The quotes we have all indicate a 4 week lead time plus commissioning and installation whereas the portable unit we can get immediately.

    Would there be much of a market providing a gas reading service do you think?
     
  2. sjt01

    sjt01 Member

    Location:
    North Norfolk
    Fixed with continuous monitoring works well for us. We inhibit digester feed if the methane drops below 52%. We control air bleed for H2S suppression from the gas monitor. The CH4 signal controls the CHP gas mixing. We now have two analysers, one on CH4, H2S and O2 measuring the gas from the digester into the gas holder, and a second CH4 only on the gas line into the CHP. We found the delay in signal due to the gasholder was causing us problems, which is why we use two. We use what was called Hitech, now http://www.mtl-inst.com/products/cat/gas_analysis/

    We calibrate ourselves on a regular basis, and have been pleased with the longevity of the cells so far. If you are visiting North Norfolk you are welcome to come and see.

    Stephen
     
  3. Fowler VF

    Fowler VF Member

    Go and talk to the boys at Ockeridge; or me! All in your neck of the woods. We all used http://www.gasdata.co.uk/ It aint cheap, but the results can be useful to you as well as for compliance.
    It was always well known that all CHP installations over 50kw needed full gas analysis to get ROC's.
     
  4. turbofarming

    turbofarming Member

    Cheers for the info. Gas Data is one of the options we are looking at. Potentially one of the click systems but piped into 2 units on a T so it could be manually switched over. Are you familiar with the system?

    Trying to work out if this would be any good or if its pointless trying to use 1 system for 2 chp's if it does continuous monitoring.

    Yeah well that's what ofgem told me recently, however the installers thought it might not be needed due it being chip fueled or something.
     
  5. sjt01

    sjt01 Member

    Location:
    North Norfolk
    Are you talking about pyrolyser wood gas CHP? If so, please say so. CHP covers a range of input fuels, from diesel to natural gas, biogas and others.

    Stephen
     
  6. turbofarming

    turbofarming Member

    They are froeling woodchip burning Chps.
     
  7. Fowler VF

    Fowler VF Member

    Don't forget that Ofgem will almost certainly require you to measure gas flow as well as gas CV. This can also be quite an expensive thing to do. Again, Gasdata have a choice of flow measuring devices that can integrate with the analyser. We have 6 units being monitored by one system. Best you get in touch directly with me!
     

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