Reduction of NO{sub x} emissions from cement kiln/calciner through the use of the NO{sub x}OUT process
Conference
·
OSTI ID:234017
- Nalco Fuel Tech., Naperville, IL (United States)
- Nalco Fuel Tech, Santa Fe Springs, CA (United States)
- Ash Grove Cement Co., Portland, OR (United States)
- Ash Grove Cement Co., Seattle, WA (United States)
The post combustion reduction of NO{sub x} using urea has proven to be an effective method in controlling NO{sub x} from various combustion sources. This process, a selective non-catalytic reduction process known as NO{sub x}OUT, has been successfully demonstrated in a cement kiln/calciner operated by Ash Grove Cement. Testing was done under ten different kiln/calciner operating conditions. Using three to four injectors, NO{sub x} was efficiently reduced from 350--600 pounds per hour (3.5--6.0 lb/ton of clinker) to less than 100 pounds per hour (1.0 lb/ton of clinker). This calculates to a NO{sub x} reduction of > 80% for most cases. Chemical utilization was greater than 50%. A high degree of mixing and a long residence time at an appropriate temperature present in the preheater tower contributed to these excellent results. An average ammonia slip was four ppm above a baseline level at normalized stoichiometric ratio of 1. Based on this demonstration, cement kiln/calciners have been identified as an ideal application for the NO{sub x}OUT Process. NO{sub x} was efficiently and effectively reduced with minimal byproduct emissions and virtually no effect on plant operations.
- OSTI ID:
- 234017
- Report Number(s):
- CONF-9404294--
- Country of Publication:
- United States
- Language:
- English
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