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Validation of an Integrated Hydrogen Energy Station

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Validation of an Integrated Hydrogen Energy Station VII.2 Validation of an Integrated Hydrogen Energy Station Technical Barriers Edward C. Heydorn This project addresses the following technical barriers Air Products and Chemicals, Inc. from the Technology Validation section (3.5.4) of the 7201 Hamilton Blvd Fuel Cell Technologies Program Multi-Year Research, Allentown, PA 18195 Phone: (610) 481-7099 Development and Demonstration Plan: Email: [email protected] (C) Hydrogen Refueling Infrastructure DOE Managers (I) Hydrogen and Electricity Co-Production HQ: Jason Marcinkoski Phone: (202) 586-7466 Contribution to Achievement of DOE Technology Email: [email protected] Validation Milestones GO: Jim Alkire Phone: (720) 356-1426 This project will contribute to achievement of the Email: [email protected] following DOE milestones from the Technology Validation section of the Fuel Cell Technologies Program Multi-Year Contract Number: DE-FC36-01GO11087 Research, Development and Demonstration Plan: Subcontractor: • Milestone 37: Demonstrate prototype energy station for FuelCell Energy, Danbury, CT 6 months; projected durability >20,000 hours; electrical Project Start Date: September 30, 2001 energy efficiency >40%; availability >0.80. (4Q, 2008) Project End Date: December 31, 2011 • Milestone 38: Validate prototype energy station for 12 months; projected durability >40,000 hours; electrical energy efficiency >40%; availability >0.85. (1Q, 2014) Fiscal Year (FY) 2012 Objectives FY 2012 Accomplishments Demonstrate the technical and economic viability of a • On 25 May 2011, the clean-up system for anaerobic hydrogen energy station using a high-temperature fuel cell digester gas (ADG) was commissioned, and renewable designed to produce power and hydrogen. hydrogen was produced for the first time from the • Complete a technical assessment and economic analysis Hydrogen Energy Station. System efficiency of 53.5% on the use of high-temperature fuel cells, including solid exceeds the goal of 50%. oxide and molten carbonate, for the co-production of • The formal opening of the Hydrogen Energy Station and power and hydrogen (energy park concept). hydrogen fueling station at Orange County Sanitation District (OCSD) was held on 16 August 2011. • Build on the experience gained at the Las Vegas H2 Energy Station and compare/contrast the two approaches • Hydrogen coproduction economics based on the for co-production. installation and operation at OCSD were prepared, with • Determine the applicability of co-production from a costs of $3 to $5 per kilogram achievable with next- high-temperature fuel cell for the existing merchant generation hydrogen purification technology. hydrogen market and for the emerging hydrogen • The DOE Cooperative Agreement was extended to economy. December 31, 2011. • Demonstrate the concept at a suitable site with demand for both hydrogen and electricity. G G G G G • Maintain safety as the top priority in the system design and operation. Introduction • Obtain adequate operational data to provide the basis for future commercial activities, including hydrogen fueling One of the immediate challenges in the development stations. of hydrogen as a transportation fuel is finding the optimal means to roll out a hydrogen-fueling infrastructure concurrent with the deployment of hydrogen vehicles. The low-volume hydrogen requirements in the early years of DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report VII–18 Heydorn – Air Products and Chemicals, Inc. VII. Technology Validation fuel cell vehicle deployment make the economic viability of based on actual equipment, fabrication, and installation stand-alone, distributed hydrogen generators challenging. quotes as well as new operating cost estimates. High-level A potential solution to this “stranded asset” problem is the risks were identified and addressed by critical component use of hydrogen energy stations that produce electricity in testing. In Phase 3, a detailed design for the co-production addition to hydrogen. To validate this hypothesis, a four- system was initiated. The system was fabricated and, prior phase project was undertaken to design, fabricate and to shipping to the field, the entire system was installed at demonstrate a high-temperature fuel cell co-production FuelCell Energy’s facility in Danbury, CT for complete concept. The basis of the demonstration was a FuelCell system check-out and validation. In Phase 4, the system was Energy DFC®-300 molten carbonate fuel cell modified to operated on municipal waste water-derived biogas at OCSD, allow for the recovery and purification of hydrogen from Fountain Valley, California, under a 3-year program with the the fuel cell anode exhaust using an Air Products-designed California Air Resources Board (CARB), with co-funding by hydrogen purification system. the South Coast Air Quality Management District (AQMD). ® DOE received 6 months of data from the initial operating The DFC technology is based on internal reforming phase to validate the system versus DOE’s economic of hydrocarbon fuels inside the fuel cell, integrating the performance targets. synergistic benefits of the endothermic reforming reaction with the exothermic fuel cell reaction. The internal reforming of methane is driven by the heat generated in the fuel cell and Results simultaneously provides efficient cooling of the stack, which is needed for continuous operation. The steam produced Figure 1 shows the process flow diagram for the in the anode reaction helps to drive the reforming reaction Hydrogen Energy Station. Methane is internally reformed forward. The hydrogen produced in the reforming reaction is at the fuel cell anode to hydrogen and carbon dioxide. The used directly in the anode reaction, which further enhances fuel cell operates near 600°C and uses molten carbonate the reforming reaction. Overall, the synergistic reformer-fuel electrolyte as the charge carrier. Heated air is combined with cell integration leads to high (~50%) electrical efficiency. the waste gas from the hydrogen purification system and ® oxidized. These resultant waste gases are fed to the cathode. The baseline DFC power plant (electricity only) is The fuel cell cathode converts waste gas carbon dioxide designed to operate at 75% fuel utilization in the stack. The to the carbonate charge carrier to complete the fuel cell remaining 25% of fuel from the anode presents a unique circuit. The fuel cell stack generates a direct current voltage, opportunity for low-cost hydrogen, if it can be efficiently which is then converted to alternating current by an inverter recovered from the dilute anode effluent gases. The recovery in the electrical balance of plant. The system produces and purification of hydrogen from the anode presents several 480 VAC, 60 HZ, and a nominal 300 kW without hydrogen challenges: (1) the anode off-gas is a low-pressure, high- co-production. Excess carbon dioxide and water leave the temperature gas stream that contains ~10% hydrogen by cathode as exhaust, and heat can be recovered from these volume; (2) the anode exhaust stream must be heat integrated exhaust gases. with the fuel cell to ensure high overall system efficiency; and (3) the parasitic power used for purification must be About 70 to 80% of the hydrogen is converted to power, optimized with the hydrogen recovery and capital cost to and some hydrogen remains available for recovery. The enable an economically viable solution. anode exhaust gas is cooled and sent to a water-gas shift catalytic reactor to convert most of the carbon monoxide present in the stream to hydrogen and carbon dioxide. After Approach an additional cooling step, this gas stream is then compressed and sent to the PSA system. The PSA uses adsorbents to A hydrogen energy station that uses a high-temperature remove carbon monoxide, carbon dioxide, and water to fuel cell to co-produce electricity and hydrogen was produce a high-purity hydrogen stream. The waste gas from evaluated and demonstrated in a four-phase project. In the PSA is catalytically oxidized and returned to the cathode. Phase 1, Air Products completed a feasibility study on the The PSA system can also be placed in stand-by mode to technical and economic potential of high-temperature fuel stop hydrogen production and allow for maximum power cells for distributed hydrogen and power generation. As part production by the DFC® system, thereby improving the of this analysis, three different high-temperature fuel cells system efficiency and economics. were evaluated to determine the technology most suitable for a near-term demonstration. FuelCell Energy’s DFC®- In late 2008, the Hydrogen Energy Station was installed 300 technology was selected for concept development. In at FuelCell Energy’s facilities in Danbury, CT for a system Phase 2, a process design and cost estimate were completed check-out and validation of performance on natural gas and for the hydrogen energy station that integrated the fuel cell simulated digester gas. In June 2010, the Hydrogen Energy with a pressure swing adsorption (PSA) system selected Station was disassembled and prepared for shipment from and designed by Air Products. Economics were developed Danbury, CT to the OCSD wastewater treatment plant in FY 2012 Annual Progress Report DOE Hydrogen and Fuel Cells Program VII–19 VII. Technology Validation Heydorn – Air Products and Chemicals, Inc. Hydrogen Energy Station Air Gas Cleanup CH4 + 2H2O → 4H2 + CO2 = - Fuel H2 + CO3 → H2O + CO2 + 2e Water-Gas Shift Anode = - CO3 Electrolyte 2e Exhaust Cathode Heat - =
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