Plate Mill

Only available on StudyMode
  • Topic: Rolling, Henry Cort, Mill scale
  • Pages : 9 (2515 words )
  • Download(s) : 78
  • Published : May 29, 2013
Open Document
Text Preview
Sourav Sett
National institute of technology, durgapur.

-------------------------------------------------
Plate Mill
project report
Sourav Sett
National institute of technology, durgapur.

-------------------------------------------------
Plate Mill
project report

Project Report
Plate Mill
Jindal Steel and Power Ltd.
Raigarh

Name: Sourav Sett
College: National Institute Of Technology, Durgapur

Introduction
I am very grateful to Mr. N.Rajkumar and Mr.S.S.Kumar for giving me the opportunity to pursue my vocational training at the Plate Mill, JSPL Raigarh plant for a period of 20 days starting from 15.05.2013. I am also very thankful to Mr.Vinay Singhal for extending all sorts of help and his sound guidance led to the successful completion of my training.

Reheating Furnace (RHF)
It is an oil and gas fired furnace (dual fuel)
There are two reservoirs to hold the fuel which are of capacities 500Kl and 20Kl respectively. Capacity of furnace: 200 tonne per hr
The mechanism on which the slabs are moved inside the furnace is called Walking Beam Mechanism the lift of which is 200mm and the forward stroke is of 670mm. Total No. Burners: 66 ( 30 on top and 36 on the sides)

Width of the furnace: 10.1m
Length of the furnace: 36.5m
There are 8 zones of the furnace
Temperature of the preheating zone: 1130 centigrade
Temperature of the soaking zone: 1250 centigrade
Temperature of the heating zone: 1260 centigrade

LAMINAR FLOW SYSTEM
Introduction
The function of a Laminar Flow System is to cool product leaving the Rolling Mill to the proper coiling temperature. This function is accompanied by direct application of cooling water. The system consists of 4 banks of Top and Bottom cooling headers. Each bank of headers receives its cooling water supply from a centrifugal pump dedicated to that bank of headers. Each bank of headers consists of 7 Top headers and 16 Bottom headers, except bank 2 which has 14 Bottom headers. The flow of cooling water to the system operates continuously. During periods when products is not being cooled, the system flow is diverted. The Top headers are equipped with deflector troughs that are moved in and out of positions by means of air cylinders. The Bottom headers employ by-passes controlled by air operated on off valves. The computer control system selects how many banks, or individual headers of a bank, that will be put in the “on” position to hit proper coiling temperature. In addition, the system utilizes Side Sweeps are located prior to remove excess cooling water from the Top surface of the product. There are 5 side sweeps used on the system. The side sweeps are located prior to bank 1, between each bank of headers and after bank 4. All side sweeps are supplied from one centrifugal pump. Each side sweep location has on/off control via an air operated 3-way valve. When selected to the “off” position, the water is diverted away from the nozzles and sent to the cold well located under the run-out tables. The laminar flow control valve will regulate the boosted bay water supply into the laminar flow pit at three different rates. These rates will be 2500 GPM, 3900 GPM & 5300 GPM and the rate that is supplied into the pit will be determined by two variables- temperature and level. When the mill is put into operation, the boosted bay water supply shutoff valve will be open and the control valve will initially modulate to maintain 2500 GPM. The control valve will be modulated according to the differential pressure reading, via pressure transmitter across flow orifice. The temperature reading will via temperature sensor/ transmitter and the level reading is via level transmitter. The level transmitter is to be set to alarm if the water level in the laminar flow pit drops 18” below the weir elevation in the clearwell. If the water level in the laminar flow pit drops 24” below the weir elevation in the clearwell the 4 laminar flow pumps and the side spray pump must...
tracking img