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Successful Case

Coking Industry

Jiantao Chemical Plant

Sanyang Coking Plant

Classic Case

Customer:

**** Co. Ltd.

Flue Gas Treatment Procedure:

SCR+ESP+FGD, ammonia SCR

CEMS system:

**** SCS-900C

CEMS question:

  • D2_dish_07.pngSO₂ large deviation during whole CEMS calibration;
  • D2_dish_07.pngLong T90 time beyond the scope allowed by the national standard;
  • D2_dish_07.pngCondensed water and ammonia salt in heated pipeline, ammonia leakage concentration is very high;
  • D2_dish_07.pngCan’t pass whole CEMS calibration;
  • D2_dish_07.pngLarge zero shift when using atmosphere for auto calibration.

Solution and Application

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.

Solution & Test results verification after application

Data comparison: CEMS SO₂ test range 0-100mg/m³

ItemSO₂ standard gas Con.T90 (s)SO₂ reading(mg/m³)Error of whole CEMS calibration%
Before PreGASS modification25.0mg/m³>>2002.2mg/m³ 22.8%
49.9mg/m³>>20030.2mg/m³19.7%
88.4mg/m³ >>20071.3mg/m³ 17.1%
After PreGASS modification25.0mg/m³12523.2mg/m³ 1.8%
49.9mg/m³ 11348.5mg/m³1.4%
88.4mg/m³10787.2mg/m³1.2%

Result & Performance:

30 days from onsite survey & installation & commissioning acceptance, T90<130s, deviation error of whole CEMS calibration <±2.5%.