SCR Zone-Based Hybrid Dynamic Leveling Technology and Its Application for W-Flame Boiler
Burning anthracite in W-flame boiler inevitably results in the emission of high concentrations of NOx as much as 700~1 200 mg/m3 even with the low nitrogen combustion technology implemented. Therefore, the combination of “SNCR+SCR” is often adopted as the traditional route of ultra-low emission cont...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
State Grid Energy Research Institute
2020-11-01
|
| Series: | Zhongguo dianli |
| Subjects: | |
| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202002093 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Burning anthracite in W-flame boiler inevitably results in the emission of high concentrations of NOx as much as 700~1 200 mg/m3 even with the low nitrogen combustion technology implemented. Therefore, the combination of “SNCR+SCR” is often adopted as the traditional route of ultra-low emission control. However, in addition to the high investment and operating costs, this technical route is extremely likely to cause excessive ammonia slip, which eventually leads to air preheater blockage. In this paper, the SCR transformation project of two 330 MW W-flame boilers are conducted by adopting the “SCR zone-based hybrid dynamic leveling technology”. The test results show that after the completion of the project, the SCR removal efficiencies of both boilers have been raised to more than the super high value of 94% while the ammonia escape rate is controlled under 2 µL/L. In this way, not only the goal of ultra-low emission can be achieved but also 14 million RMB of the SNCR investment and 7.6 million RMB of annual operation costs is saved respectively. Besides, to remove the same amount of NOx, 19% less ammonia is consumed after the transformation while the differential pressure of air preheater is still maintained stably in the long term. |
|---|---|
| ISSN: | 1004-9649 |