Client: Ningbo Jiufeng Thermal Power Co., Ltd
Location: Zhejiang, China
Project type: Boiler Denitrification: SCR+SNCR for boilers #1- #3; SNCR for boiler #4
Capacity: 4 x 130 t/hr boilers
Time of completion: May, 2014
In this denitrification project for 4 x 130t/hr circulating fluidized bed boilers, Integrated SCR+SNCR technology has been applied for boilers #1- #3 and SNCR technology has been applied for boiler #4.
For the SCR units of boilers #1- #3, one SCR reactors have been set up corresponding to each boiler and the installation locates between the upper part and the lower part of the economizer with the embedded layout. For boilers #1- #3, the design denitrification efficiencies are ≥75%, and for boiler #4, where only SNCR is applied, the design denitrification efficiency is ≥60%. 20% aqueous ammonia was selected as denitrification sorbent. It is diluted to 3%-5% before injection.
Technical Specs
| Inlet flue gas | Boilers #1- #3 | Boiler #4 |
| Flow rate（Dry basis, actual O2） | 3×153,295 Nm3/h | 154199 Nm3/h |
| NOx content（Standard condition, wet basis, actual O2） | ≤ 300 mg/ Nm3 | ≤ 300 mg/ Nm3 |
| Particulate matter content（Standard condition, wet basis, actual O2） | 36 g/ Nm3 | 35 g/ Nm3 |
| Performance | ||
| Denitrification efficiency | ≥ 75％ | ≥ 60％ |
| NOx emission (dry basis，6%O2) | ≤ 75 mg/Nm3 | ≤ 120 mg/Nm3 |
| Ammonia slip (dry basis，6%O2) | ≤ 2.5 mg/Nm3 | ≤8 mg/Nm3 |
| SO2/SO3 conversion | ≤ 1% | ≤ 1% |
| Design life | 30 years | 30 years |
