Fuel cells for stationary power

Paul Boughton

Fuel cell-based power generation technologies are expected to receive a huge boost due to current transmission networks' inability to handle excess demand, issues of transmission losses and the costs incurred thereby as well as the concern about power quality at the end points.

The domestic requirement of additional electric power is likely to touch 1.7 trillion kilowatt hour (kWh) in 2020. This is three times the requirement during 1980 to 2000. It will be a significant challenge for any power utility to accommodate such a large incremental load using only its existing transmission and distribution network.

The reluctance of power companies to invest in newer power plants because of lack of returns and the widening gap between the demand and supply of power are expected to motivate the distributed power generation.

Enhancing or building new power plants could cause power utilities' reserve margins to exceed peak demand says Frost & Sullivan Research Analyst Viswanathan Krishnan. This scenario can drive the distributed power generation sectorfor which the fuel cell technologies are considered the most appropriate for its various benefits such as high energy conversion efficiency and its potential to offer reliable and quality power."

Neverthelessthe development of these fuel cell technologies has been restrained largely due to high costscomplex designs and fuel problems. The industry is optimistic about resolving these issues with researchers and companies enthusiastically developing innovative solutions for the inherent problems in the application of fuel cells in stationary power.

For fuel cell technology to be effective commerciallytechnology developers have to devise strategies to reduce the costs of fuel cell systems. In stationary fuel cell systems' stackscosts are lowered by minimising the use of expensive materials.

While one method is to enhance fuel cell units' cost-competitiveness is to produce them in large volumestechnology developers also need to focus on inventive and economical ways to obtain hydrogen from hydrocarbons or from other sources to increase the use of fuel cell-based systems.

Researchers have already developed a direct fuel cell-based technology that uses potassium lithium carbonate as the electrolyteoperates at 1200 deg Cand provides 250 kilowatt (kW) to 3 megawatt (MW) power. This technology can help generate electricity directly from hydrocarbon fuels such as natural gas and wastewater treatment gas.

This one-step energy conversion process offers significant cost benefits over competing technologies such as phosphoric acid fuel cells (PAFCs) and proton exchange membrane fuel cells (PEMFCs)which use complex reforming techniques.

In another cost-related issuetechnology developers will have to ensure the availability of hydrogen-rich natural gas to facilitate distributed generation applications as well as to stabilise prices to drive greater uptake of the technology.

An important factor that is driving the industry further is the growing concern for environment and fossil fuelswhich has motivated participants to look for various alternate power generation technologies. Leading research institutions and companies prefer fuel cell-based power generationas the electrochemical conversion of chemical energy to electricity in a fuel cell is a 'green process'.

"The elegant emission profile - emitting trace sulphur and nitrogen - makes these technologies an ideal choice for stationary power applications notes Mr Krishnan.

For more information, visit http://ti.frost.com


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