search.noResults

search.searching

dataCollection.invalidEmail
note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
WASTE TO ENERGY


scenario, biogas in combination with air can form an explosive gas mixture that, in a confined space near an ignition source, can result in explosion. Although explosions are thankfully extremely rare, they bring a high risk of serious injuries and fatalities and, as a result, are something no plant owner ever wants to experience on their site. Biogas also contains hydrogen sulphide


(H2


air, it will fall to the ground. In confined, poorly ventilated spaces it can accumulate and remain unnoticed until someone enters, resulting in sometimes fatal effects. Gas leaks on AD plants also have a financial impact. Any volume of biogas leaking into the atmosphere will subsequently reduce a plant’s gas yield; and therefore, the owner’s profit margin. In fact, losing just 1m3


S), a toxic gas that has been the cause of a number of deaths in the UK agricultural industry in relation to slurry tank management. As H2


of methane per


hour will result in a financial loss in the region of £5,000 per year. Tere is also the issue of sustainability criteria to consider. To receive payments through either the feed-in tariff (FIT) or renewable heat incentive (RHI) schemes, AD operators must demonstrate that their plant is operating sustainably. Regulators have considered clamping down on this area, as some industry reports mention very high levels of fugitive emissions. Site operators can therefore use gas leakage surveys as a way to protect against potential loss of incentives and demonstrate to the authorities that their


S is heavier than


AD plants have inherent weak spots, which make them


susceptible to biogas leakage


plant is well-managed, with leaks kept to a minimum.


LEAKAGE HOTSPOTS


Although an AD operator may believe that their plant is operating at a high standard, all anaerobic digesters have inherent weak points that make them susceptible to biogas leakage. Potential hotspots include: gas membrane connections; cable grommets (where a submersible stirrer cable passes through the digester wall); flange connections; viewing windows; carbon filters; and any areas where maintenance is carried out.


REDUCING YOUR RISK Te risks of gas leakage are clearly significant and often expensive. However,


identifying a leak is a simple and affordable process that can help prevent a serious incident from occurring. A gas leakage detection service should therefore form part of any responsible plant operator’s ongoing maintenance programme. For example, the FM BioEnergy


service covers a full AD plant survey with a methane-sensitive monitor and laser, as well as infrared devices, including: survey of all tanks, CHP, biogas upgrading equipment, roof membranes, pipes and flanges; analysis of emissions from CHP and double-membrane covers; and report with images, videos and repair priority table.


Although the majority of its audits to


date have uncovered minor leaks, 25% were found to have serious failings; fixing these not only prevents a more serious and costly incident from occurring, it also often results in a 12-month payback on the price of the survey.


Te best times to conduct a detection


survey are at the start of full operation; after significant maintenance work; if your feed-to-gas conversion is lower than expected (and the biology remains stable); and of course, if you can smell biogas. After all, the cost of detecting a potential leak is minimal but the implications of leaving it to chance could be massive.


A detection survey using a methane-sensitive monitor and laser, as well as infrared devices, can spot biogas leaks invisible to the naked eye


Tim Elsome is general manager for FM BioEnergy. www.forfarmers.co.uk/fm-bioenergy


www.engineerlive.com 39


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52