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Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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Fig. 1.4 shows a micro gas turbine used in a CHP system. This system has two major parts. The main part is a gas turbine Brayton cycle and the bottoming cycle is a single pressure heat recovery steam generator (HRSG). Hot flue gases from the gas turbine enter the HRSG to produce saturated water at P = 20 bar and ̇ kg/s. The net power output of this gas turbine is 50 MW. As Fig. 1.4 shows, the thermal efficiency of the CHP system is higher than in a simple gas turbine cycle because the waste energy of hot flue gases is being utilized in a heat exchanger (HRSG) to produce the heating load, which in this case is saturated water. Selection of the HRSG is based on the size of the gas turbines; large capacity gas turbines have the ability to produce steam in double or triple pressure levels of HRSG. These gas turbines are usually used for power generation purposes. Therefore, gas turbines can be considered a good candidate for multigeneration energy systems according to the advantages discussed above. Figure 1.4: The schematic diagram of a gas turbine prime mover used in CHP 1.3.2 Fuel cell prime mover A fuel cell is a device that generates electricity by a chemical reaction. Every fuel cell has two electrodes, one positive and one negative called, respectively, the anode and cathode. The reactions that produce electricity take place at the electrodes. Each fuel cell also has an electrolyte, which carries electrically charged particles from one electrode to the other, and a catalyst, which speeds the reactions at the electrodes. Hydrogen is the basic fuel; however fuel 27

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