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Reduction of nitrogen oxides by injection of urea in the freeboard of a pilot scale fluidized bed combustor

✍ Scribed by Koen E. Knol; Eduard A. Bramer; Marinus Valk

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
557 KB
Volume
68
Category
Article
ISSN
0016-2361

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✦ Synopsis

The 'thermal deN0,' process using urea has been investigated in a 1 MW fluidized bed combustor. NO, reductions of up to 76% were obtainable by using this method. The experimental results show that urea is at least as active as NH,, which is commonly used in this application, but which is far more toxic and corrosive. Emission levels of 200 mg m -3 for NO, could be achieved by injecting the urea at a height of 2 m above the distribution plate in a molar ratio urea:NO,= 1.5. The SO2 emission value also appeared to be reduced when the urea was injected at a urea:NO, molar ratio ~4.

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