viii UK Focus - Air Monitoring
• Secondly, the fuel duty charged on gas is only half that charged on diesel. The Government has realised the many benefits of gas use in transportation and have helpfully frozen the favourable duty differential for gas versus diesel for the next ten years. This action has guaranteed the favourable cost advantage of gas versus diesel fuel for the next decade.
Liquid LNG and Bio-LNG are Both Very Safe.
Gas used for vehicle fuel is transported as a very cold liquid in specially constructed cryogenic road tankers. It is delivered to bunkering sites or service stations and sold either as a liquid from a pump similar to a diesel dispenser or, “re-gassed” and sold as a compressed gas from a similar dispenser. The cold temperature and intrinsic properties of the fuel mean that the product is less volatile than other commonly used fuels and is therefore very safe when handled in the proper manner.
Other countries, where gas has been used as a transportation fuel for longer and on a much larger scale than hitherto in the UK, have experienced an excellent safety record in both the transportation and dispensing of gas at the point of sale.
The UK’s first Bio-LNG open access station opened last year and is now delivering over 1000 truck fills per week Is LNG and Bio-LNG Available?
biomethane as a transport fuel and is now the largest supplier of liquefied gas fuel to the road transport sector. The company currently supplies more than 60 per cent of gas powered HGVs on UK roads and operates 11 refuelling stations around the country. It also secured European funding at the end of 2013 to build a further four in the UK and two mobile stations in continental Europe.
The company owns and operates its own biomethane liquefaction plant – supplied by sustainable landfill gas – and owns a fleet of road tankers which deliver to its refuelling stations.
Its product, Bio-LNG, is a blend of liquefied biomethane with conventional (fossil) LNG and today it supplies, installs and manages open access and customer dedicated on-site refuelling facilities for its many transport customers, which include Sainsburys, B&Q, DHL, Waitrose, Tesco, the Stobart Group, Kuehne + Nagel, Arla Dairies and Muller Wiseman.
What are the Advantages of LNG and Bio-LNG?
The simple answer is that both LNG and Bio-LNG are much cleaner and also less costly than diesel.
Firstly, LNG in its pure fossil form produces about 12% less of the greenhouse gas, CO2
the bio component of the fuel is at just 15%, produces 25% less CO2
blend is higher, CO2 than diesel. Premium Bio-LNG, where
than diesel. Where the bio content of the Bio-LNG savings can reach as much as 70% versus
diesel. There is no other current transport fuel or technology that can be deployed today that reduces CO2
as cost effectively.
Secondly, SOx and NOx emissions, the harmful gases that contribute to ozone depletion and smog in urban areas, are reduced by a staggering 85-95% versus the use of diesel fuel. While both LNG and Bio-LNG perform well in this respect, the
bio-fuel is once again cleaner than fossil LNG. This aspect of poor air quality is strongly linked to the sharply rising incidence of asthma, bronchitis and emphysema particularly in the vulnerable young and old age groups in our cities.
Thirdly, emissions of soot or particulate matter from diesel engines, are practically eliminated by using LNG or bio-LNG in place of diesel fuel. Taken together with SOx and NOx emissions, it is difficult to exaggerate the human cost of the failure to address poor air quality across the country. Added to human suffering is the economic cost of lost time at work or school due to respiratory conditions and of course the direct cost to the NHS of treating these conditions.
Fourthly, there is the matter of noise. Vehicles with gas engines, particularly heavy vehicles such as HGV’s, buses and refuse trucks, are much quieter than diesel-powered equivalents. Quite apart from reducing the general nuisance of ambient traffic noise, the major benefit of lower engine noise almost certainly resides in the enabling of more deliveries of goods during night time hours. Shifting deliveries to the night time will reduce day time congestion and, potentially deliver a knock-on benefit in terms of improving the road safety for vulnerable groups such as cyclists by reducing their exposure to HGV traffic.
Finally, and of critical importance, both LNG and Bio-LNG are cheaper than diesel and for that matter, much cheaper than other clean fuel solutions such as electric vehicles. The economics of purchasing a vehicle with a gas engine or converting a diesel engine to gas are compelling particularly for heavy loaded and high mileage vehicles.
Favourable economics are underpinned by two fundamentally important facts.
• Firstly, gas is abundant and is significantly cheaper than oil. Gas is predicted to remain cheaper than oil for the foreseeable future, and:
Today, only relatively small amounts of LNG are available for road tanker loading in the UK at National Grid’s Avonmouth storage and liquefaction terminal. These supplies are supplemented by imports from larger LNG terminals located in Zeebrugge and Rotterdam. This situation is however about to change.
The UK already has three world scale LNG import terminals. The Isle of Grain terminal, situated in the Thames estuary just 40 miles from central London, is the largest LNG facility in Europe and it will commission road-loading facilities by the second quarter of 2015. It is likely, that as demand grows for LNG as a road fuel, road-loading facilities will be added to the two massive LNG import terminals located at Milford Haven. LNG supply is thus plentiful and assured for the long term.
Presently, Gasrec operates the only source of UK liquefied biomethane from a large landfill site at Albury in Surrey. This facility has the capacity to produce approximately 5,300 tonnes of liquid biomethane per annum (equivalent to around 20 million litres of diesel at a standard bio-LNG blend). However more bio-gas and bio-LNG for transportation fuel will certainly be produced from other landfill sites, anaerobic digestion facilities and sewage plants as demand for the fuel grows and as end users commit to off-take contracts which will help underwrite the capital investment required to bring these plants on stream.
What is really needed is for the significant industry and media attention on this subject to be re-focussed on the need to encourage faster development of a strategic supply network of biomethane filling stations across the motorway network, and the faster conversion of the country’s commercial HGV fleet to operate on dual-fuel or gas only. Such encouragement could really bring very real and rapid benefits to the health of the nation.
Gas Conditioning Made Easy
The PGCS is a smart solution for stack testers looking to carry out frequent stack emission tests across different sites. Stack testing is a procedure carried out by engineers to determine the concentration of gas and dust emissions being released into our atmosphere. Stack emission testing must be carried out to ensure that sites are complying with environmental standards. The amount of stack testing required is based on the size of the site and the amount of emissions, the greater the emissions the greater the need for continuous stack testing.
One of the UK’s largest MCERTS and UKAS accredited stack emissions testing contractors with extensive experience in the emissions testing industry has recently placed an order for a large quantity of Portable Gas Conditioning Systems (PGCS) from a1-cbiss Ltd.
“Versatile and neatly packaged the PGCS is the perfect portable gas sampler for emission stack testers”
The a1-cbiss ltd PGCS is designed to ensure a clean flow and accurate sample of gas, correctly prepared for the analyser in gas monitoring systems. Whilst conducting ‘on-the-spot’ detailed gas analysis a gas conditioning system is required to remove particulates, cool gas, and eliminate condensation. Housed in a compact, highly visible and robust carrying case and weighs just 12kg, the PGCS can be easily carried up the stack to conduct gas measurements.
The PGCS features a gas cooler that is equipped with an innovative heat exchanger system. The dew point is set at 4°C but can be changed at any value between 1°C and 15°C. Optional flow meters with integrated needle valves are available. The flow meters are built-in as the electronic controller. The exterior digital display from the gas cooler and flow meter gauge can be read whilst the carry case is closed. Any condensation is continually removed by the peristaltic pump.
A heated sample line that doesn’t require external power is mounted at the gas measuring inlet terminal inside the portable case. The amount of flow is determined by a sample gas diaphragm pump. The portable gas sampling probe is connected to the heated line and is mounted within the stack for emissions testing.
For More Info, email: email:
For More Info, email: email:
31047pr@reply-direct.com IET Annual Buyers’ Guide 2014/15
www.envirotech-online.com
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