ENERGY SAVING TECHNOLOGIES FOR STEEL PLANTS

AT

INDIA-JAPAN BUSINESS FORUM FOR ENERGY EFFICIENCY, CONSERVATION AND RENEWABLE ENERGY

07th November, 2019. New Delhi

TABLE OF CONTENT

1. COMPANY PROFILE 2. DRY TYPE MULTI VESSLE ELECTROSTATIC PRECIPITATOR 3. COKE DRY QUENCHING SYSTEM

1. 2019 COMPANY PROFILE

STEEL PLANTS WASTE TO ENERGY ENERGY SOLUTIONS MARINE ENGINEERING AND

CONSTRUCTION

BUILDING CONSTRUCTION AND

STEEL STRUCTURES PIPELINES

NIPPON STEEL CORPORATION GROUP

Pursue synergies and Business developed from steelmaking

2. DRY TYPE MULTI VESSEL ELEECTROSTATIC PRECIPITATOR

Dry type Multi Vessel Electrostatic Precipitator

system

[ Dry MVEP ]

in Blast Furnace Gas Cleaning Plant

LINEUP OF NSENGI SECONDARY GAS CLEANING SYSTEM AT BF

Secondary GCP at BF

Wet type GCP

Dry type GCP

① VS-VS

Filter type

ESP type

ESP type

Slit type

② VS - ESCS

④ Dry MVEP system

③ Bag Filter system

NSENGI deals with all products

related to secondary GCP

BF TRT Secondary GCP Primary GCP

Newly Lineup

※ GCP ( Gas Cleaning

Plant)

※ ESCS™ ( Electrostatic

Space Cleaner Super)

※ TRT ( Top pressure

Recovery Turbine)

※ ESP ( Electrostatic

Precipitator )

FEATURE COMPARISON OF WET TYPE GCP WITH DRY TYPE GCP

WET type GCP DRY type GCP

Environment A large amount of polluted water is generated. “ZERO Liquid discharge”(Drastic reduction in water consumption)

Energy recovery Energy recovery is low. Energy recovery is high (TRT recovered electric energy is greatly up)

Dry type GCP becomes main stream because of Ecological Aspects

FEATURE COMPARISON OF DRY BAG FILTER & DRY ESP

Type

Dry type GCP

Bag Filter ESP

Example Pals jet type Bag Filter system Dry MVEP system

Operation It is necessary to control the temperature of the blast furnace gas at the top spraying water.

No special precautions.

Maintenance Regular filter cloth replacement is necessary ( High costs ).

Normally only maintenance (regular visual inspection) etc.

Space Wide Space is necessity. Compact.

CAPEX and

OPEX

The vessel is numerous ( 18 ~ 20 unit ). Construction cost is high.

The dust collecting vessel is few ( 4 ~ 5 ). Weight is small.

Dry MVEP system is more cost competitive than Bag Filter

PERFORMANCE COMPARISON

Dry GCP is better in Ecological aspect ( no polluted water and higher energy recovery )

3. Saving the installation space

2. Easy maintenance ( only regular visual inspection )

1. High operational stability

CONCLUSION

4. Low CAPEX and OPEX

The reason why we propose the Dry MVEP system compared with bag filter

The latest technology of CDQ (Coke Dry Quenching) System

COKE DRY QUENCHING

As such a high

temperature

OUTLINE OF CDQ

Iron ore

Lime

Coke Oven

Sintering

factory

Blast

furnace

Sintered ore

Cooling process of hot coke

Coke

1000 ℃

Coke

Less than 200℃

Pig

iron

CWQ（Coke Wet Quenching）

Water Quenching

Coal

CDQ（Coke Dry Quenching）

Dry Quenching

Cooling the hot coke in a close space with inert gas/

・Recover the heat to generate the electric Power

・Reduce the emission of dust & gas.

Cooling the hot coke with water / Non–heat-Recovery

Hot coke

OUTLINE OF CDQ

Electric

Power

Generation

1000˚C

Cooled Coke

：200˚C

Boiler

Discharging

Equipment Sub

Economizer

Charging Equipment

Blower

Secondary

Dust Catcher

Primary

Dust catcher

Cooling

Chamber

Pre-

Chamber

Crane

170℃

980˚C Steam

Turbine 130℃

generator

14

Environmental

improvement Improvement of

Productivity at BF

Saving Energy

CO2 Reduction

ADVANTAGES OF CDQ

15

15 © 2019, Nippon Steel Engineering Co., Ltd.

Figure 2: Power production capacity of CDQ

CO2 :36 t/h

CDQ

200t/h

Electric Power

36MW

CO2 : Small

amount

Heavy OilApprox. 12 t/h

Heavy Oil

Firing Boiler

CDQ

BoilerSensible heat of coke

Steam

SteamElectric Power

36MW

SAVING ENERGY & CO2 REDUCTION

Fossil fuel Heavy oil

approx. 12t/h

Electricity

36MW

Electricity

36MW

16

Dust：300～400g/t-coke

CWQ

(Coke Wet Quenching)

CDQ

(Coke Dry Quenching)

Dust：Less than 3g/t-coke

ENVIRONMENTAL IMPROVEMENT

OPEN SYSTEM CLOSED SYSTEM

17

Coke strength after

CO2 reaction (CSR)

2.5% UP

Coke strength after

CO2 reaction (CSR)

2.5% UP

6 kg/t-pig iron

Reduction of

coke ratio

6 kg/t-pig iron

Reduction of

coke ratio

6 kg/t-pig iron

Reduction of

coke ratio

Moisture content

of Coke

Nearly ZERO Waterless

Cooling

gradually

Cooling

gradually

Moisture content

of Coke

Nearly ZERO

Blast

Furnace

Coke quality improvement

※Actual result in NSSMC-group

Quenching with inert gas

Benefit of CDQ

at Blast Furnace Installation of CDQ

Waterless

Drum Index (DI)

1.5% UP

8%

Iron productivity

limit

100 kg/t-pig iron

Injection limit

of pulverized

non-coking coal

Drum Index (DI)

1.5% UP

8%

Iron productivity

limit

100 kg/t-pig iron

Injection limit

of pulverized

non-coking coal Keeping

the coke strength

Increasing of

bony coal

(low quality coal)

ratio of

charging coal

IMPROVEMENT OF PRODUCTIVITY AT BLAST

FURNACE

Profile

190 200 175 180 150 118 110 75 56 Capacity

(t/h)

1988 1987 1974 Operation

Start 2009

280

World’s

largest

CDQ 280t/h