Loading...

Development of Improved Conversion Energy System based on High Temperature Fuel Cells

Golzar, Farzin | 2014

844 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46086 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin
  7. Abstract:
  8. Sustainable development is the basic aim of energy researchers. But common conversion technologies with respect to efficiency, fuel type and pollution of them, need basic operating improvement to reach sustainable development. Aim of this project is investigation of high temperature fuel cells as basic energy convertor. To improve performance of fuel cell system, four integration systemsare modeled and proposed. Using integrated systems in combined cooling, heat and power is another way of improving performance of systems, that is done in this project.
    To improve system performance, the optimum operating values of these parameters is determined. In order to use four proposed system in deferent conditions, five objective functions is defined and optimization is done according to them. In first condition, objective function is minimom of LCOE. In this optimization, hybrid system of fuel cell\gas turbine\steam turbine with LCOE of 9.9¢/kWh has the lowest LCOE among four systems. In second condition, objective function is minimom of CO2 emission rate. Results of optimization show that hybrid system of fuel cell/gas turbine with 10716 ton/year, has the lowest emission, while in first condition the value of emission rate is about 44976 ton/year. But it should be noticed that in second condition, LCOE is about 36.33¢/kWh that is a high value in comparison with common conversion technologies. In third condition, CO2 emission rate with use of carbon tax, is considered in operating costs. So objective function is the minimom of LCOE with considering CO2 tax. In this case, hybrid system of fuel cell/gas turbine/steam turbine has the lowest LCOE with 10.76¢/kWh. Fourth condition is a multi objective optimization that LCOE and CO2 emission are selected as objective functions and for each hybrid system, a pareto curve is presented. Objective function of fifth condition is LCOE with a difference that fuel price is not considered in LCOE. This objective function is for use of fuel cell in petrochemicals in order to use excess H2 as fuel. The lowest LCOE in this case is 6.96¢/kWh for fuel cell\gas turbine\steam turbine. In cooling system generation, COP of simple compression chiller is about 2.2, while for improved compression chiller with the help of solar organic rankine cycle, this value is increased to 6.35. using improved compression chiller caused to decrease of 6905 kWh/year consumption of energy
  9. Keywords:
  10. Reciprocating Chiller ; Combine Cooling Heating and Power (CCHP) ; Carbon Dioxide Emission ; High Temperature Fuel cell ; Levelized Energy Cost (LEC) ; Solar Organic Rankine Cycle

 Digital Object List

 Bookmark

No TOC