A Structure of Bistable Electromagnetic Actuated Microvalve Fabricated on a Single Wafer, Implementing the SLA and PDMS Technique

2003 ◽  
Author(s):  
Jemmy Sutanto Bintoro ◽  
Rajesh Luharuka ◽  
Edward W. Wong ◽  
Peter J. Hesketh
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Delivery System ◽  
Processing Temperature ◽  
Surface Micromachining ◽  
Fuel Delivery ◽  
Valve Assembly ◽  
Cmos Compatible

This report presents a complete package for bistable electromagnetic actuated microvalve. The function of the valve is to control the fuel delivery system in a fuel cell unit for power generation [1,2]. The microvalves were fabricated on top of a single wafer using 8 masking steps. The fabrication processes have a maximum processing temperature of 300 °C, providing potentially a CMOS compatible process. The valve arrays that compromise of 12 valves per 12 MM × 12 MM chip are built completely by surface micromachining. The chip is assembled into a package with fluidic connection parts. The parts were made from the stereo lithography (SLA) frame that was filled with PDMS. The PDMS also acts as a gasket to seal the microvalve from leaking. The fluidic tests show that the whole valve assembly can stand from leaks up to the pressure of 57.4 kPa.

Modeling and Controls of a Fuel Delivery System With Dual Recirculation Lines for a PEM Fuel Cell System

2008 ◽  
Author(s):  
Jinglin He ◽  
Song-Yul Choe ◽  
Chang-Ouk Hong
Keyword(s):  
Fuel Cell ◽  
Delivery System ◽  
Flow Rate ◽  
Flow Channel ◽  
Integrated System ◽  
The Other ◽  
Automotive Application ◽  
Pressure Regulator ◽  
Supply Line ◽  
Fuel Delivery

A fuel delivery system with dual recirculation lines is investigated in this paper, which can reuse the exhausted gas from the outlet of anode flow channel. In the automotive application, the fuel delivery system regulates the hydrogen pressure and flow rate from the tank to the anode flow channel that change dynamically with load. The control objectives of fuel cell stack require that a slight pressure difference between the anode and cathode be maintained to prevent the damage of the membrane. In addition, the unconsumed hydrogen is circulated to a supply line by the recirculation lines. The fuel delivery system analyzed in this paper consists of two supply lines and two recirculation lines. The supply line with a low pressure regulator accounts for the supply of fuel at relatively low load demands. The other supply line with a flow controller starts to provide additional fuel with controllable flow rate at high load demands. The recirculation line with an ejector allows for mixing the unconsumed hydrogen with the supplied fuel. The other recirculation line with a blower is used to improve the controllability of the recirculation flow rate. Analysis of the fuel delivery system with dual recirculation lines is carried out by modeling and simulating an integrated system, where the components are modeled involving the dynamic characteristics. The major components of fuel delivery and recirculation system are an ejector, a blower, and a pressure regulator. In addition, the linearization of the integrated system is expressed in the approach of state equations to form the control problem of the system. Then the linear controllers are designed based on the decentralized proportional and integral control, and the state feed-back control. The systems with the different controllers are simulated at different operating points to evaluate their tracking performance by comparing the dynamic response curves.

Modeling and Control of a Hybrid Fuel Delivery System Based on a Two-Phase Anodic Model of a PEM Fuel Cell

2010 ◽  
Author(s):  
Jinglin He ◽  
Song-Yul Choe
Keyword(s):  
Fuel Cell ◽  
Delivery System ◽  
Cell Model ◽  
Control Valve ◽  
Cell System ◽  
Flow Channel ◽  
Thin Layers ◽  
Fuel Cell System ◽  
Two Phase ◽  
Fuel Delivery

A polymer electrolyte membrane fuel cell (PEM FC) system for automotive applications should meet the rapid variable power demand by consuming the fuel, hydrogen. The fuel delivery system is designed to supply the hydrogen from tank to fuel cell system, and sometime re-circulate exhausted hydrogen to increase the fuel efficiency and maintain the humidity at the anode side for proper water management. The pressure in anode flow channel should track the pressure in cathode flow channel to prevent high pressure difference damage on the thin layers in cells with stable stiochiometric ratio of hydrogen. In this paper, we analyze a hybrid fuel delivery system that consists of two supply and two recirculation lines including a control valve, low pressure regulator, an ejector, and a blower. A quasi-1D two-phase transient fuel cell model is incorporated into the fuel delivery system for the design of controllers. A state feed-back controller were implemented and optimized, which is integrated with the fuel delivery and fuel cell system and be simulated to evaluate its tracking and rejection performance.

Power generation and pollutants removal from landfill leachate in microbial fuel cell: Variation and influence of anodic microbiomes

2018 ◽  
Vol 247 ◽  
pp. 434-442 ◽  
Author(s):  
Muhammad Hassan ◽  
Huawei Wei ◽  
Huijing Qiu ◽  
Yinglong Su ◽  
Syed Wajahat H. Jaafry ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Landfill Leachate ◽  
Pollutants Removal ◽  
Cell Variation

scholarly journals Development of catalytic combustion and CO2 capture and conversion technology

2021 ◽  
Author(s):  
Zhibin Yang ◽  
Ze Lei ◽  
Ben Ge ◽  
Xingyu Xiong ◽  
Yiqian Jin ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Catalytic Combustion ◽  
Coal Gasification ◽  
Solid Oxide ◽  
Multi Scale ◽  
Electrolysis Cells ◽  
Integrated Gasification ◽  
Solid Oxide Electrolysis Cells ◽  
Sofc Stacks

AbstractChanges are needed to improve the efficiency and lower the CO2 emissions of traditional coal-fired power generation, which is the main source of global CO2 emissions. The integrated gasification fuel cell (IGFC) process, which combines coal gasification and high-temperature fuel cells, was proposed in 2017 to improve the efficiency of coal-based power generation and reduce CO2 emissions. Supported by the National Key R&D Program of China, the IGFC for near-zero CO2 emissions program was enacted with the goal of achieving near-zero CO2 emissions based on (1) catalytic combustion of the flue gas from solid oxide fuel cell (SOFC) stacks and (2) CO2 conversion using solid oxide electrolysis cells (SOECs). In this work, we investigated a kW-level catalytic combustion burner and SOEC stack, evaluated the electrochemical performance of the SOEC stack in H2O electrolysis and H2O/CO2 co-electrolysis, and established a multi-scale and multi-physical coupling simulation model of SOFCs and SOECs. The process developed in this work paves the way for the demonstration and deployment of IGFC technology in the future.

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