Experimental Study on Combustion Characteristics and NO(x) Emissions of Pulverized Anthracite Preheated by Circulating Fluidized Bed
Wang, J; Zhu, JG; Lu, QG
HERO ID
834055
Reference Type
Journal Article
Year
2011
Language
English
| HERO ID | 834055 |
|---|---|
| In Press | No |
| Year | 2011 |
| Title | Experimental Study on Combustion Characteristics and NO(x) Emissions of Pulverized Anthracite Preheated by Circulating Fluidized Bed |
| Authors | Wang, J; Zhu, JG; Lu, QG |
| Journal | Journal of Thermal Science |
| Volume | 20 |
| Issue | 4 |
| Page Numbers | 355-361 |
| Abstract | A 30 kW bench-scale rig of pulverized anthracite combustion preheated by a circulating fluidized bed (CFB) was developed. The CFB riser has a diameter of 90 mm and a height of 1,500 mm. The down-fired combustion chamber (DFCC) has a diameter of 260 mm and a height of 3,000 mm. Combustion experiments were carried out using pulverized anthracite with 6.74% volatile content. This low volatile coal is difficult to ignite and burn out. Therefore, it requires longer burnout time and higher combustion temperature, which results in larger NO(x) emissions. In the current study, important factors that influence the combustion characteristics and NO(x) emissions were investigated such as excess air ratio, air ratio in the reducing zone, and fuel residence time in the reducing zone. Pulverized anthracite can be quickly preheated up to 800 degrees C in CFB when the primary air is 24% of theoretical air for combustion, and the temperature profile is uniform in DFCC. The combustion efficiency is 94.2%, which is competitive with other anthracite combustion technologies. When the excess air ratio ranges from 1.26 to 1.67, the coal-N conversion ratio is less than 32% and the NO(x) emission concentration is less than 371 mg/m(3) (@6% O(2)). When the air ratio in the reducing zone is 0.12, the NO(x) concentration is 221 mg/m(3) (@6% O(2)), and the coal-N conversion ratio is 21%, which is much lower than that of other boilers. |
| Doi | 10.1007/s11630-011-0481-6 |
| Wosid | WOS:000292279000010 |
| Url | http://www.springerlink.com/index/10.1007/s11630-011-0481-6 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | circulating fluidized bed; preheat; pulverized anthracite; NOx |
| Is Qa | No |