Jiantao Chemical Plant
Sanyang Coking Plant
Customer：
**** Co. Ltd.
Flue Gas Treatment Procedure：
SCR+ESP+FGD, ammonia SCR
CEMS system：
**** SCS-900C
CEMS question:
SO₂ large deviation during whole CEMS calibration;Long T90 time beyond the scope allowed by the national standard;Condensed water and ammonia salt in heated pipeline, ammonia leakage concentration is very high;Can’t pass whole CEMS calibration;Large zero shift when using atmosphere for auto calibration.After onsite survey, recommend PreGASS-9500 precondition system without change any situation of existing CEMS, effectively remove the moisture and ammonia in the sample gas, prevent the loss of SO₂ and the ammonium salt deposit, improve the response time, meet the national standard requirements, and solve customer problems.
Data comparison: CEMS SO₂ test range 0-100mg/m³
| Item | SO₂ standard gas Con. | T90 (s) | SO₂ reading（mg/m³） | Error of whole CEMS calibration% |
| Before PreGASS modification | 25.0mg/m³ | >>200 | 2.2mg/m³ | 22.8% |
| 49.9mg/m³ | >>200 | 30.2mg/m³ | 19.7% | |
| 88.4mg/m³ | >>200 | 71.3mg/m³ | 17.1% | |
| After PreGASS modification | 25.0mg/m³ | 125 | 23.2mg/m³ | 1.8% |
| 49.9mg/m³ | 113 | 48.5mg/m³ | 1.4% | |
| 88.4mg/m³ | 107 | 87.2mg/m³ | 1.2% |
Result & Performance:
30 days from onsite survey & installation & commissioning acceptance, T90<130s, deviation error of whole CEMS calibration <±2.5%.
