Process for decreasing N.sub.2 O emissions from a fluidized bed

Details Process for decreasing N.sub.2 O emissions from a fluidized bed Process for decreasing N.sub.2 O emissions from a fluidized bed

1992-05-22

1994-07-05

Yuen, Henry C.

Furnaces

Refuse incinerator

Refuse suspended in or supported by a fluid medium

122 4D, F22B 102

Patent

active

053257960

ABSTRACT:
Emissions of nitrous oxide (N.sub.2 O) are lowered in a fluidized bed reactor utilizing two-staged combustion. A lower region of the furnace section is operated under substoichiometric conditions so that combustion in the lower region is incomplete, thereby inhibiting formation of N.sub.2 O and nitrogen oxides (NO.sub.x). An upper region of the furnace section is operated under oxidizing conditions to promote further combustion. An amount of particulate material is present in the upper region, and this amount of particulate material in the upper region is controlled to maintain a temperature in the upper region for destroying N.sub.2 O formed during combustion. The amount of particulate material present in the upper region may in turn be controlled by controlling the particulate material entrained from the lower region to the upper region. The temperature is also preferably controlled within a range to permit sulfur capture by sorbent particles so that emissions of N.sub.2 O, NO.sub.x, and oxides of sulfur (SO.sub.x) may be simultaneously lowered.

REFERENCES:
patent: 4039621 (1977-08-01), Costantini
patent: 4084545 (1978-04-01), Nack et al.
patent: 4308810 (1982-01-01), Taylor
patent: 4435148 (1984-03-01), Moss
patent: 4602573 (1986-07-01), Tanca
patent: 4704084 (1987-11-01), Liu et al.
patent: 4708067 (1987-11-01), Narisoko et al.
patent: 4716844 (1988-01-01), Koch
patent: 4773339 (1988-09-01), Garcia-Mallol
patent: 4809625 (1989-03-01), Garcia-Mallol et al.
patent: 4936770 (1990-06-01), Abdulally
patent: 4955295 (1990-09-01), Abdulally
patent: 4962711 (1990-10-01), Yamauchi et al.
patent: 5020456 (1991-06-01), Khinkis et al.
patent: 5141708 (1992-08-01), Campbell, Jr.
G. Hammons and A. Skopp, NO.sub.X Formation and Control in Fluidized Bed Coal Combustion Processes, ASME Publication (Nov.-Dec. 1971).
L. Amand and S. Andersson, Emissions of Nitrous Oxide (N.sub.2 O) from Fluidized Bed Boilers, 1989 Int'l Conf. on FBC.
A. Braun, U. Renz, J. Drischel, and H. Koser, N.sub.2 O- and NO.sub.X emissions from a fluidized bed combustor, Wirbelschict-Systeme--Conf. 1990.
L. Gustavsson and B. Leckner, N.sub.2 O Reduction With Gas Injection in Circulating Fluidized Bed Boilers, 1991 Intl. Conf. on FBC.
M. Hiltunen, P. Kilpinen, M. Hupa, and Y. Lee, N.sub.2 O Emissions From CFB Boilers: Experimental Results and Chemical Interpretation, 1991 Int'l Conf. on FBC.
T. Shimizu, Y. Tachiyama, M. Souma, and M. Inagaki, Emission Control of NO.sub.X and N.sub.2 O of Bubbling Fluidized Bed Combustor, 1991 Int'l Conf. on FBC.
E. Bramer and M. Valk, Nitrous Oxide and Nitric Oxide Emissions by Fluidized Bed Combustion, 1991 Int'l Conf. on FBC.
A. Braun, C. Bu, U. Renz, J. Drischel, and H. Koser, Emission of NO and N.sub.2 O From a 4 MW Fluidized Bed Combustor With NO Reduction, 1991 Int'l Conf. on FBC.
A. Brown and L. Muzio, N.sub.2 O Emissions From Fluidized Bed Combustion, 1991 Int'l Conf. on FBC.
A. Jahkola, Y. Lu, and I. Hippinen, The Emission and Reduction of NO.sub.x and N.sub.2 O in PFB-Combustion of Peat and Coal, 1991 Int'l Conf. on FBC.
I. Cabrita, M. Costa, H. Esparteiro, and I. Gulyurtlu, Determination of Overall Fuel-N Balance During Fluidised Bed Coal Combustion, 1991 Int'l Conf. on FBC.
T. Hulgaard, P. Glarborg, and K. Dam-Johansen, Homogeneous Formation and Destruction of N.sub.2 O at Fluidized Bed Combustion Conditions, 1991 Int'l Conf. on FBC.
H. Miettinen, D. Stromberg, and O. Lindquist, The Influence of Some Oxide and Sulphate Surfaces on N.sub.2 O Decomposition, 1991 Int'l Conf. on FBC.
H. Moritomic, Y. Suzuki, N. Kido, and Y. Ogisu, NO.sub.X Formation Mechanism of Circulating Fluidized Bed Combustion, 1991 Int'l Conf. on FBC.
M. Wojtowicz, J. Lohuis, P. Tromp, and J. Moulijn, N.sub.2 O Formation in Fluidised-Bed Combustion of Coal, 1991 Int'l Conf. on FBC.
P. Wallman, E. Ivarsson, and R. Carlsson, NO.sub.X and N.sub.2 O Formation in Pressurized Fluidized-Bed Combustion Tests, 1991 Int'l Conf. on FBC.
K. Iisa, P. Salokoski, and M. Hupa, Heterogeneous Formation and Destruction of Nitrous Oxide Under Fluidized Bed Combustion Conditions, 1991 Int'l Conf. on FBC.

Affiliated with

Also associated with

Rating

Process for decreasing N.sub.2 O emissions from a fluidized bed does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for decreasing N.sub.2 O emissions from a fluidized bed , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for decreasing N.sub.2 O emissions from a fluidized bed will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-790346