National Research Development Corporation ALCOHOL BIOSENSOR

PLANT PARAMETERS
Suggest Production Capacity	30 – 50 Kg. Of hot metal
No. of shifts / day	3
Working days / Yr	330
UTILITIES
Power	30 / 25 KVA
Steam	Depending upon size of storage tank Transportation, Distance, Climatic condition
Nitrogen	Back up media
Compressed Air	120 Nm³ per hour
No. of tnyere	1200 Nm³
MAJOR PLANT & EQUIPMENT
Coal tar pump, Coal tar Storage tanks, Secondary Heaters , Heating arrangement for storage tanks & transportation and distribution, Control Well, Instrumentations, Injection lance, Accessories
SPACE REQUIRED
Furnace Area	7 x 6 Mts. Two floors plus automation transportation area 18 x 8 Mts.
MANPOWER REQUIREMENT
Existing manpower shall be sufficient.

Introduction:

The technology relates to Coal Tar Injection in Blast Furnace for production of Iron. There are many disadvantages associated with the utilization of the coal tar into the blast furnace. Therefore, the main objective is to provide a simple and effective device for utilization of the coal tar in the steel plant itself.

Coal Tar Transfer and Storage

Coal tar from coke oven By-product plant is pumped to the storage tanks in using steam traced pipeline. Each tank having capacity of 500 T and temperature of tar in the storage tank is being maintained at 70 – 80^oC approximately by way of steam heating coils and suction heaters. The amount of tar present in each storage tank is shown by float type level indicator, attached with the tank.

Coal Tar Pumping and Transportation

This facility consists of electrically driven positive displacement pumps, steam driven emergency pump, secondary tar heaters, tar carrying supply and return lines, steam header, back pressure control and associated measuring and control devices. Coal tar is pumped from one of the storage tanks by motorized positive displacement pump into tar supply line via secondary tar heaters (one working, one stand by). The tar is transported to the Blast furnace ring main by supply line and return tar after consumption in blast furnaces comes back to receiving tar tank through return pipeline. Both these pipelines are insulated and heat traced by steam. In return line is equipped with tar back pressure control for maintaining stable pressure at consuming end of blast furnaces for injection. The system is designed for continuous operation and recirculation of tar at a steady set pressure in the ring main required for injection.

The Salient Feature of the System

Working as autonomous unit, irrespective of coal tar consumption in blast furnaces
Equipped with safety devices to ensure safe handling of tar to blast furnaces and back to the system

Benefits

- Tata Steel has achieved coal tar versus coke replacement ratio over 1 : 1.4 at the current rate of tar injection as (40 – 50 Kg/THM) Utilization of tar in place of coke will reduce coke consumption.

- Utilization of tar helps reducing pollution

- In house utilization of tar eliminates disposal problem without affecting operation of coke oven batteries.

FINANCIAL GAIN

Increase of blast furnace yield upto 10%.

COST OF PRODUCTION

The rate of return shall be calculated on coke saving per ton of hot metal
The cost of installation of the unit can be recovered within one year

STAGE OF DEVELOPMENT

This has been implemented in four blast furnaces at TATA Steel having a rate of injection 10 TPD of 30-50 Kg. Per kg of hot metal.

TESTS

The Report conducted at the TATA Steels was found to have replacement of

Coal tar : Coke in the ratio of 1 : 1.35.

ADVANTAGES

This is a process which can be integrated to the blast furnace for injection of coal tar or any other waste fuel (Mobil, Grease etc.) being accumulated for operation of the plant.
Saving of coke due to high replacement ratio of coal tar vs. coke is 1 : 1.35
In house utilization of coal tar or any other waste fuel, it can work as an incinerator
Productivity increase by 10%

COAL TAR INJECTION IN BLAST FURNACE

The Salient Feature of the System

Benefits