Esp Efficiency

IMPROVEMENT OF ESP EFFICIENCY

UNIT 8

TROMBAY THERMAL POWER STATION.

Authers of this paper

1) Shree V.M.Motghare-Joint Director, Air Pollution MPCB

2) Mr. Sanjay Kher-Tata Power

3) Mr. P. Venkatesan -Tata Power

4) Mr. Anand Gurav- Tata Power

INTRODUCTION:

Trombay Thermal Power Station is one of the largest power producing station in India, under the flag ship of The Tata Power Company Ltd. The station was established way back in 1956 and its current generation capacity it 1580 MW with 5 different units. Installation year and generation capacity of each unit is given in the table below. Unit 1,2,& 3 were decommissioned after 40 years of service.

Unit No | CapacityMW | Fuel | Installed Year |

4 | 150 MW | Oil+Gas | 1965 |

5 | 500 MW | Coal+Oil+Gas | 1984 |

6 | 500 MW | Oil+Gas | 1990 |

7 | 180 MW | Gas | 1994 |

8 | 250 MW | Coal | 2009 |

Among the existing operating units, 250 MW unit no 8 is youngest and operates on low ash low sulfur Indonesian coal. Coal consumption on unit is about 3000 MT per day.

Since the unit 8 is new, MPCB while granting the NOC to the unit imposed a stringent condition of 100 mg/NM3 for SPM emission from the chimney. To meet the stringent SPM emission limit, ESP for unit 8 was designed for very high collection efficiency to achieve SPM emission level less than 50 mg/NM3 (half the value of statutory limit) to keep the margin for variation in the operating parameters.

ESP is designed for 2 rows and 5 fields in each row. Each field is provided with 2 thyristor, multiple emitting electrodes( spiral wires) and discharge electrodes (rigid plates ) and 2 collection hoopers. Dry fly ash collection system is provided along with storage silo.

BOILER

Field arrangement of ESP at site is provided as per the diagram given below.

1000

6

7

8

9

2

3

4

5

1

1000

6

7

8

9

2

3

4

5

1

B1 A1

B2 E A2

B3 S A3

B4 P A4

B5 A5...