Fuel cell technologies – Part 3-1: Stationary fuel cell power systems – Safety
|Publication Date:||1 April 2007|
|ICS Code (Fuel cells):||27.070|
This part of IEC 62282 is a product safety standard suitable for conformity assessment as stated in IEC Guide 104:1997, ISO/IEC Guide 51:1999 and ISO/IEC Guide 7:1994.
This standard applies to stationary packaged, self-contained fuel cell power systems or fuel cell power systems comprised of factory matched packages of integrated systems which generate electricity through electrochemical reactions.
This standard applies to:
- systems intended for electrical connection to mains direct, or with a transfer switch, or to a stand-alone power distribution system;
- systems intended to provide a.c. or d.c. power;
- systems with or without the ability to recover useful heat;
- systems intended for operation on the following input fuels:
a) natural gas and other methane rich gases derived from renewable (biomass) or fossil fuel sources, for example, landfill gas, digester gas, coal mine gas;
b) fuels derived from oil refining, for example, diesel, gasoline, kerosene, liquefied petroleum gases such as propane and butane;
c) alcohols, esters, ethers, aldehydes, ketones, Fischer-Tropsch liquids and other suitable hydrogen-rich organic compounds derived from renewable (biomass) or fossil fuel sources, for example, methanol, ethanol, di-methyl ether, biodiesel;
d) hydrogen, gaseous mixtures containing hydrogen gas, for example, synthesis gas, town gas.
This standard does not cover
- portable fuel cell power systems;
- propulsion fuel cell power systems.
The overall design of the power system anticipated by this standard shall form an assembly of integrated systems, as necessary, intended to perform designated functions, as follows.
- Fuel processing system: Catalytic or chemical processing equipment plus associated heat exchangers and controls required to prepare the fuel for utilization within a fuel cell.
- Oxidant processing system: The system that meters, conditions, processes and may pressurize the incoming supply for use within the fuel cell power system.
- Thermal management system: Provides cooling and heat rejection to maintain thermal equilibrium within the fuel cell power system, and may provide for the recovery of excess heat and assist in heating the power train during startup.
- Water treatment system: Provides the treatment and purification of recovered or added water for use within the fuel cell power systems.
- Power conditioning system: Equipment which is used to adapt the electrical energy produced to the requirements as specified by the manufacturer.
- Automatic control system: The assembly of sensors, actuators, valves, switches and logic components that maintains the fuel cell power system parameters within the manufacturer's specified limits without manual intervention.
- Ventilation system: Provides, by mechanical means, air to a fuel cell power system's cabinet.
- Fuel cell module: Assembly of one or more fuel cell stacks, electrical connections for the power delivered by the stacks, and means for monitoring and/or control.
- Fuel cell stack: Assembly of cells, separators, cooling plates, manifolds and a supporting structure that electrochemically coverts, typically, hydrogen rich gas and air reactants to d.c. power, heat, water and other byproducts.
- Onboard energy storage: Internal energy source intended to aid or complement the fuel cell module in providing power to internal or external loads.
This standard is applicable to stationary fuel cell power systems intended for indoor and outdoor commercial, industrial and residential use in non-hazardous (unclassified) areas.
This standard contemplates all significant hazards, hazardous situations and events, with the exception of those associated with environmental compatibility (installation conditions), relevant to fuel cell power systems, when they are used as intended and under the conditions foreseen by the manufacturer.
This standard deals with conditions that can yield hazards on the one hand to persons and on the other to damage outside the fuel cell system only. Protection against damage to the fuel cell system internals is not addressed in this standard, provided it does not lead to hazards outside the fuel cell system.
The requirements of this standard are not intended to constrain innovation. When considering fuels, materials, designs or constructions not specifically dealt with in this standard, these alternatives shall be evaluated as to their ability to yield levels of safety and performance equivalent to those prescribed by this standard.