Comparison of the emission behavior for pressurized fluidized bed and pressurized pulverized coal combustion
Conference
·
OSTI ID:20013448
Combined cycle systems with coal-fired gas turbines provide highest cycle efficiencies for this fuel. There are two ways to use coal as a fuel for a combined cycle power plant: gasification or combustion. With combustion systems, the most promising technologies are Pressurized Fluidized Bed Combustion (PFBC) and Pulverized Coal Combustion Cycle (PCCC). PFBC has particular advantages compared with conventional firing systems, e.g. in-situ pollutant removal (SO{sub 2}), high thermal efficiencies even in intermediate power ranges. The low combustion temperature of about 1,050-1,200 K results in low NO{sub x} emissions without any secondary flue gas treatment but yields considerable N{sub 2}O emissions. PCCC on the other hand offers high glue gas temperatures of about 1,500-1,600 K and thus high gas turbine inlet temperatures yielding the highest possible cycle efficiencies for this fuel. The high combustion temperatures ensure liquid ash removal but may also yield higher NO{sub x} emissions. The object of this work was to examine the pressure effects on the emission behavior of PFBC and PCCC, especially NO{sub x}/N{sub 2}O emissions and CO conversion. Of special interest was pressure influence on the emission behavior of these two combustion system. The effects of increased operating pressure on gaseous emissions of PCCC and PFBC, especially SO{sub 2}, NO{sub x} and N{sub 2}O , were studied . For PFBC, dolomite and calcinated lime were used as additives for in-situ sulfur capture at different molar ratios in each case and its influence on NO{sub x} and N{sub 2}O emissions were studied.
- Research Organization:
- Univ. Stuttgart (DE)
- Sponsoring Organization:
- German Federal Department for Education, Science, Research and Technology
- OSTI ID:
- 20013448
- Country of Publication:
- United States
- Language:
- English
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