OPTIMISATION OF BLAST FURRNACE GAS INTAKE TO THERMAL POWER PLANT BY ID FAN MODIFICATION IN VISAKHAPATNAM STEEL PLANT

A Project Report submitted by

K.SAILENDRA (2011JE0951)K.DILIP KUMAR (2011JE0950)T.MANIKANTA (2011JE0949)R.AJAY KUMAR REDDY (2011JE0842)

UNDER ESTEEMED GUIDANCE OF

T.SATYANARAYANAManager (mechanical),Thermal Power Plant,Visakhapatnam Steel Plant,Visakhapatnam.

INDIAN SCHOOL OF MINES, DHANBAD

CERTIFICATE

This to certify that project work entitled optimization of blast furnace gas intake to thermal power plant by induced draft fan modification is a bonafide work done by Mr. K.Sailendra (2011JE0951),Mr. K. Dilip Kumar (2011JE0950),Mr. T.C.N.S Manikanta(2011JE0949), Mr. R. Ajay Kumar (2011JE0856) at Thermal power Plant of Visakhapatnam Steel Plant, students of 3rd year B.Tech (Mechanical engineering) from Indian School of Mines, Dhanbad from 02-12-2013 to 14-12-2013 under my supervision and guidance.

Signature of external guide

T.SATYANARAYANA Manager (mechanical),Thermal Power Plant,Visakhapatnam Steel Plant,Visakhapatnam.Visakhapatnam. Date:

ACKNOLEDGEMENT

We are grateful to our guide Sri T.SATYANARAYANA, Manager (mechanical) Thermal Power Plant Visakhapatnam Steel Plant for his help in completion of project.

We express our deep sense of gratitude to Sri N. PRADEEP KUMAR DGM, Thermal Power Plant, Visakhapatnam Steel Plant, Shown keen interest at every stage of development of our project work in every aspect.We are also deeply indebted to Prof. Randip Kumar Das, HOD, Mechanical Department, Indian School of Mines, Dhanbad for providing the necessary facilities during the execution of this project

K.SAILENDRAK.DILIP KUMAR T.C.N.S. MANIKANTAR. AJAY KUMAR REDDY

REPLACEMENT OF PRIMARY AIR HEATERProblem before repair: With single PA fan only one mill could be taken Problem identified and rectified: Total tubular air-preheater replaced.

EFFECTS after repairs: With single PA fan-3 mills are being taken Air temperature to bowl mills increased from 65O c to 80O c

ID FAN IMPELLER MODIFICATIONProblem before modification: ID fans were getting loaded up to 75 amps only. Furnace draft was going to positive when more than 1, 00,000 BFG is taken.

Modifications carried out: 2 nos. of spare ID fan impeller outer diameter increased by 250 mm in UERS. Vane length also increased correspondingly in URES. With the one spare shafts available both the modified impellers are balanced at CMS.

Work done at site: ID fans rotor was taken out. Its cones were removed. Fitted in new shaft with modified impellers and assemble. Rotor was assembled with shaft taken out from ID-A. Cones from ID-B and modified impeller. Both the ID fans discharge expansion bellow were repaired.

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CALCULATIONS:

I1 = 75 ampsI2 = 100 ampsP = VIcosP1 = VI1cos P2 = VI2cosP1/P2 = (VI1cos/VI2cos)P1/P2 = I1/I2P1/P2 (D1/D2)5Q1/Q2 (D1/D2)3ThenP1/P2 = (Q1/Q2)5/3Q1/Q2 = (P1/P2)3/5Q1/Q2 = (I1/I2)3/5Q1/Q2 = (75/100)3/5Q1/Q2 = 0.84147Q2 = 1.1884AROUND 18.84% RAISE IN ID FAN CAP.