why electricity produced in thermal power station is not
friendly -eco
Answers
Answer:
Technology challenges and R&D needs
The CFCs offer many advantages over conventional coal-fired thermal power plants which include high efficiency, less CO2 and pollutant emissions, and easy capture of CO2 in concentrated stream and no water management requirements. Although indirect CFCs, where coals are externally cleaned and reformed to produce CO or syngas, have reached a high level of technology maturity partly due to the large effort that has gone into the development of molten carbonate and SOFC, the DCFCs are still at an early stage of development [15,16,22] with a number of unresolved technical challenges. There are many different types of CFCs, each with its own set of technical challenges. Most of the early R&D effort on molten hydroxide and molten carbonate electrolyte based DCFCs has decreased substantially due to low power densities and corrosion/degradation issues [15,16,22]. The major global R&D effort since about 2000 is on CFCs which employ a solid oxide electrolyte. However, one of the key challenge is the continuous supply of solid fuel to the anode/electrolyte interface through the pore structure of the anode.
A number of strategies proposed include the use of a molten carbonate or a molten metal mixed with fine carbon particles to deliver solid fuel to the electrochemically active reaction sites or use of a mixed ion/electron conducting anode to shift carbon electrochemical oxidation reaction from anode/electrolyte interface to anode/fuel interface [15–19,23]. However, these systems suffer from overall system complications and serious corrosion of fuel cell components (reaction of molten carbonates with solid oxide electrolyte) or decomposition of mixed ionic/electron conducting materials in reducing environments in fuel compartment. Thus robust materials and strategies are required to overcome corrosion and degradation issues. Further, optimum continuous fuel feed mechanisms need to be developed for continuous generation of power. Operation of the fuel cell in a batch type fuel delivery mode is more like a battery. Coal preparation to remove volatiles and ash (present in widely varying compositions and physical properties depending on its location) before coal can be fed in a solid or molten delivery system is another challenge along with understanding of carbon conversion and utilization [16,22]. None of the DCFCs have been up-scaled to practical levels (kW or above) and life times of only few hundred hours have been demonstrated, significantly further away from real life times of multi 10,000 hours required for practical devices. At the current level of investment, which is very low and mostly at academic level, compared to other fuel cell types or advanced coal-fired power plants, it will take a long time before DCFCs are likely to be commercialized.
Explanation:
because at Thermal power station there is Electricity generated by burning coal and due to this there will be huge pollution