A Study on Effect of Recirculated Exhaust Gas upon Performance and Exhaust Emissions in a Power Plant Boiler with FGR System

Title & Authors
A Study on Effect of Recirculated Exhaust Gas upon Performance and Exhaust Emissions in a Power Plant Boiler with FGR System
Bae, Myung-whan; Jung, Kwong-ho; Park, Sung-bum;

Abstract
The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing $\small{NO_x}$ emissions. To activate the combustion, the OFA with 0 to 20% is supplied into the flame. When the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between $\small{0^{\circ}}$ and $\small{90^{\circ}}$, also, the combustion air supplied to burner is changed. It is found that the fuel consumption rate per evaporation rate did not show an obvious tendency to increase or decrease with rising the FGR rate, and $\small{NO_x}$ emissions at the same OFA damper opening are decreased, as FGR rates are elevated and boiler loads are dropped. While a trace amount of soot is emitted without regard to the operation conditions of boiler load, OFA damper opening and FGR rate, because soot emissions are eliminated by the electrostatic precipitator with a collecting efficiency of 86.7%.
Keywords
Recirculated Exhaust Gas;Performance;Exhaust Emissions;Power Plant Boiler;Flue Gas Recirculation(FGR) System;OFA(Over Fire Air) Damper Opening;
Language
Korean
Cited by
References
1.
Takeda, N., 2004, "Contribution of Technologies to Global Environment," Journal of the JSME, Vol. 107, No. 1023, p. 83.

2.
Bae, M. W., Jung, K. H. and Cho, Y. S., 2007, "A Study on the Effect of Recirculated Exhaust Gas upon Exhaust Emissions of Boiler with a FGR System," Transactions of the KSME, Vol. 31, No. 5, pp. 405-415.

3.
Bae, M. W. and Song, B. H., 2014, "A Study on Effect of Urea-SCR Aftertreatment System upon Exhaust Emissions in a LPG Steam Boiler," Transactions of the KSAE, Vol. 22, No. 3, pp. 1-11.

4.
Bae, M. W. and Lim, J. K., 1995, "A Study on Effect of EGR upon Fuel Consumption Rate and \$NO_x\$ Emissions in Diesel Engines," Transactions of the KSAE(KSAE No. 953707), Vol. 3, No. 1, pp. 76-88.

5.
Bae, M. W., 2014, "A Study on Characteris- tics of an Integrated Urea-SCR Catalytic Filter System for Simultaneous Reduction of Soot and \$NO_x\$ Emissions in ECU Common-rail Diesel Engines," Transactions of the KSAE, Vol. 22, No. 4, pp. 111-120.

6.
Narusawa, K. and Odaka, M., 1990, "An EGR Control Method for Heavy Duty Diesel Engines under Transient Operations," SAE Paper No. 900444, pp. 1-14.

7.
Bae, M. W., 1999, "A Study on the Effects of Recirculated Exhaust Gas on \$NO_x\$ and Soot Emissions in Diesel Engines with Scrubber EGR System," SAE Paper No. 1999-01-3266, pp. 78-87.

8.
Bae, M. W. and Mochimaru, Y., 2004, "Characteristics of Performance and Exhaust Emissions with a Combined Plasma EGR System in Diesel Engines," Proceedings of the FISITA 2004 (CD), World Automotive Congress, pp. 1-19.

9.
Bae, M. W., Ku, Y. J. and Lee, B. S., "A Study on Characteristics of Performance and \$NO_x\$.THC Emissions in Turbo Intercooler ECU Common-rail Diesel Engines with a Combined Plasma EGR System," Transactions of the KSAE, Vol. 14, No. 3, pp. 10-21.

10.
Bae, M. W., Jeon, H. J. and Choi, J. S., 1999, "The Effects of Recirculated Exhaust Gas on Fuel Economy and Exhaust Emissions in Marine Diesel Engines," CIMAC DAY 1999 Shanghai-Proceedings of International Symposium on Internal Combustion Engine of the Chinese Society for Internal Combustion Engine, pp. 91- 105.

11.
Bae, M. W., 2003, "A Study on the Characteristics of Combustion Products and Adiabatic Temperature by Theoretical Equilibrium Calculation," Subject Report for Development of Exhaust Gas Recirculation System for Reducing Nitrogen Oxide Emissions in Boilers, pp. 1-75.

12.
JSME, 1980, "Formation Mechanisms and Controls of Pollutants in Combustion System," JSME, pp. 131-143.

13.
Bae, M. W., 2005, "A Study on Effect of Recirculation Exhaust Gas upon Exhaust Emissions and Performance of Boiler with FGR System," Final Subject Report for Development of Exhaust Gas Recirculation System for Reducing Nitrogen Oxide Emissions in Boilers, pp. 1-55.

14.
Bae, M. W., Kang, W. C., Song, B. H. and Bae, J. O., 2012, "Reduction Characteristics of \$NO_x\$ Emissions by Optimal Urea Injection Rate in LPG Steam Boiler with a Urea-SCR Reactor," Proceedings of International Conference on Systems and Informatics, pp. 642-646.

15.
Bae, M. W., Song, B. H., Kang, W. C., and Bae, J. O., 2012, "Reduction Characteristics of \$NO_x\$ Emissions by the Combined DOC and Urea-SCR Aftertreatment System in a LPG Steam Boiler," Proceedings of 5th Pan Asian Association of Maritime Engineering Societies and Advanced Maritime Engineering Conference 2012 (Paper No. GT-07), pp. 1-7(CD).

16.
Bae, M. W. and Song, B. H., 2014, "A Study on Effect of Urea-SCR Aftertreatment System upon Exhaust Emissions in a LPG Steam Boiler," Transactions of the KSAE, Vol. 22, No. 3, pp. 1-11.

17.
Bae, M. W. and Mochimaru, Y., 2004, "Characteristics of Performance and Exhaust Emissions with a Combined Plasma EGR System in Diesel Engines," Proceedings of the FISITA 2004 World Automotive Congress, pp. 1-19(CD).

18.
Bae, M. W., Cho, S. K., Lee, D. J. and Syaiful, 2006, "Comparison Between Effects of Hot and Cooled EGR on \$NO_x\$ and Soot Emissions in a Scrubber EGR Diesel Engine," Proceedings of the International Conference on Fluid and Thermal Energy Conversion 2006 (FTEC 2006), Paper No. 104, pp. 104-1-104-12.

19.
Kamimoto, T. and Bae, M. W., 1988, "High Combustion Temperature for the Reduction of Particulate in Diesel Engines," SAE Paper 880423, pp. 1-10.

20.
Kamimoto, T., Bae, M. W. and Kobayashi, H., 1989, "A Study on Soot Formation in Premixed Constant Volume Propane Combustion," Combustion and Flame 75, pp. 221-228.

21.
Bae, M. W., 1989, "A Study on Soot Formation in Premixed Combustion at High Pressures," Doctoral Dissertation of Tokyo Institute of Technology, pp. 1-168.