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Hydrogen helps in whole farm approach to cutting emissions

Farming with the environment at the forefront of planning and decision making can have economic and practical benefits, suggests one Aberdeenshire farmer. Alex Heath looks at the technology employed on the farm.

Nether Aden has equipped three of its machines with hydrogen electrolysers, saving fuel and reducing emissions.
Nether Aden has equipped three of its machines with hydrogen electrolysers, saving fuel and reducing emissions.

Nether Aden, owned by David Barron and wife Nicola, is a mixed farm near Mintlaw, Aberdeenshire.

The farm occupies 210 hectares, put to grass for grazing, silage and hay, winter barley, for feed, and spring barley destined for the malting market, as well as wholecrop mixes with new grass leys undersown.

The farm is currently carrying 140 suckler cows and more than 350 total head, predominantly Aberdeen-Angus bred, with the aim of targeting markets where a premium can be gained.

For the past eight years, Mr Barron has been investigating the use of renewable and more sustainable techniques that can be employed on-farm, not only benefiting the environment, but also the overall efficiency of the farm and, consequently, its bottom line.

The first adopted technology was the use of solar and biomass to dry grain.

A 200kW ETA Hack biomass boiler and grain dryer unit was installed, providing an efficient way to dry grain, in addition to generating extra income via renewable heat incentive payments.

In addition, the farm boasts a 10kW solar array.

Pockets of woodland on-farm are used to power the boiler, in conjunction with a planting campaign, creating shelter belts while locking up more carbon.

Mr Barron says: “Renewables are a good way of cutting fuel bills and utilising clean energy, especially on tasks such as drying grain.

“They are cost-effective and equal to conventional fossil fuel systems, so it makes sense to utilise them.” Invited to compete for funding from the Scottish Government through the Farming for a Better Climate project, co-ordinated by SRUC and its advisory arm SAC Consulting, the farm was successful, and subsequently fitted a hydrogen electrolyser onto its JCB telehandler in 2017 at a cost of £6,000.

The Water Fuel Engineering HydroGen electrolyser fitted is the size of a small suitcase, says Mr Barron, and can be placed nearly anywhere on a vehicle; it is behind the cab on the telehandler.


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Efficient

 

The premise of the electrolyser is to split water into its component parts of oxygen and hydrogen, by passing an electrical current through distilled water with a potassium hydroxide electrolyte and collecting the gases.

By introducing the hydrogen rich ‘oxyhydrogen’ mix into the engine, at a rate of approximately 6 per cent, a faster burn and more efficient combustion process takes place, thus reducing the amount of fuel used and consequently lowering the amount of emissions produced.

The electrolyser manufacturer suggests a reduction of 20-25 per cent in fuel usage can be achieved, and a reduction in emissions by 80 per cent.

The 1,000 hours the telehandler is in operation each year sees a fuel saving of 1,083 litres, with an equivalent of 43,440kg of CO2 not being released as a result.

It adds that in many modern engines, up to 30 per cent of fuel introduced into the engine is not used, and instead is burnt in the exhaust system.

By increasing the amount of oxygen and hydrogen into the air mix, the burn in each stroke is quicker, without increasing the engine temperature.

The system is only in use while the engine is running and draws six to eight amps from the battery to work.

“We are saving 20 per cent on our fuel bill, worth about £600 per year, just on the telehandler,” Mr Barron says.

“It also appears to have more torque when driving and servicing costs are falling as the engine is burning cleaner.

It does not have the carbon build up like before.” Cost of the technology is also lessening, now currently about £1,000 per unit, leading to the farm investing in two more electrolyser units.

The second has been fitted to the farm’s New Holland TS115 tractor, while another has been added to the farm’s Ford Ranger pickup, with Mr Barron reporting similar results in terms of fuel saving and increased performance.

Mr Barron says maintenance is simple.

The units are topped up with distilled water every six weeks.

The farm replaced its telehandler in spring, and as of yet, has not fitted the new machine with the electrolyser box.

“We had an AdBlue issue with the new machine,” says Mr Barron.

“I am a bit reluctant while the loader is in its warranty period to fit it, as if anything does go wrong with the machine, the finger will be pointed at it, so I am holding off for the time being.

Technology

 

“Instead, we have a New Holland T6.180 which will be out of its warranty period at the end of harvest, so the spare box will go on that.

“From my experience so far, they improve the engine, so I have no worries about adding it to this tractor.” The technology has made a large impact on the farm, according to Mr Barron.

“Our two biggest bills come from fuel and fertiliser purchases, both of which are now being remedied,” he says.

“We have already cut our fuel usage by a fifth and through a few different management techniques with the crops, fertiliser usage is down by around a third.” This includes several changes to grassland management.

“We now operate a paddock grazing regime, similar to rotational grazing dairy farms, where we keep moving the cows onto younger fresher grass, which is more nutritious and encourages better growth, both of the cattle and the grass itself,” says Mr Barron.

The farm is also taking advantage of leguminous crops.

New grass leys are now undersown into pea crops, with the growing peas feeding the grass.

Likewise, an increasing amount of clover is being included in swards, by up to 30 per cent.

“We use grass mixes designed for the conditions in the North East and include white clover, which will last for about three years and provides the equivalent of 150kg/ha of nitrogen,” he says.

“In addition, the crop contains more protein for the growing cattle and has a higher digestibility.

“Whereas we used to buy in two lorry loads of fertiliser, we are now using one and a quarter, just putting on 50 units per acre in spring.

“We are also liming the fields more regularly, in line with what the arable fields would be getting, and testing for phosphorous and potassium as well.” The farm’s breeding regime on has also changed, as have cow numbers.

Historically the farm ran 110 cows, but, with a greater influence of Aberdeen-Angus genetics rather than Charolais, producing a lower mature cow weight (650kg) with lower nutritional needs from both cow and calf, as well as increased grass growth from the same acreage, the farm has been able to add an additional 30 cows.

However, Mr Barron thinks the farm could handle an additional 25 cows or 250 sheep in the near future.

Cows are fed on ammonia-treated straw while housed in winter.

Bulls

 

The herd is effectively closed, only buying in bulls from selected farms, with an emphasis placed on naturally reared bulls with good feet and decent figures for calving ease and milk.

He aims to have cattle away to a local butcher at an average age of 18 months, with a 350kg well marbled carcase, and predominantly reared and finished off grass.

While Mr Barron says he would prefer to rear bulls, as they are quicker to finish, thus reducing emissions, bulls do not command a premium, meaning steers make better financial sense In the future, Mr Barron hopes to investigate further the feasibility of a local co-operative, producing ammonia and hydrogen fertilisers from a similar principle to the electrolysers currently used on farm, further reducing the reliance and impact on the environment of compound fertilisers.

With an eye on reducing the farm’s environmental impact, Mr Barron says profitability on the farm has increased, with fewer inputs required, while outputs are greater in terms of quantity and quality.

Farm facts

  • Size: 210 hectares n Crops: Grass and clover leys, barley, wheat, peas
  • Livestock: 140 suckler cows, 350 total head
  • Machinery: JCB 525-56 telehandler, NH TS115 with hydrogen electrolyser, NH T6.180, Ford Ranger with hydrogen electrolyser

Visit the Net Zero home page

Visit the Net Zero home page

With a target of net zero carbon emissions by 2040, there is still a long way to go.

 

Visit the Net Zero home page to cut through the jargon and view our brand new showcase of some of the measures already having positive results on farms up and down the country.

 

Click here to go to the Net Zero home page

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