MODERN BLAST FURNACE EQUIPMENT OF NIPPON STEEL & SUMIKIN ENGINEERING

Transcription

1 MODERN BLAST FURNACE EQUIPMENT OF NIPPON STEEL & SUMIKIN ENGINEERING Takanori Iwakiri Nippon Steel & Sumikin Engineering CO.,LTD

2 CONTENTS 1. About Our Company and Group 2. Today introduce technology and equipment 3. Low FR operation technology 4. Energy saving technology 4.1 HS Waste-Gas Heat Recovery System 4.2 Gas Clearing System 5. Stable operation technology

3 Corporate development of our company 1. About Our Company and Group 1974 Engineering Divisions Group in NIPPON STEEL CORPORATION Established Engineering Group was made independent, forming NIPPON STEEL ENGINEERING Co., Ltd Our company name was changed to NIPPON STEEL & SUMIKIN ENGINEERING Co., Ltd. Iron Making Engineering Department BUSINESS CONTENTS Delivery records of BF :Over 80 BF from DESIGN to Over 5,000m3 : 33% share all over the world ( 9 BF ) Short relining method Ex). Inner volume : 5775m3 shut down period :68 days Hot Stove, Gas Cleaning etc.,

4 1. About Our Company and Group BUSINESS CONTENTS Ex.) Hot change of staves in short time Change of gear box [Existing] [New type] Banking for intermediate repair Additional installation of HS heat recovery system

5 CONTENTS 1. About Our Company and Group 2. Today introduce technology and equipment 3. Low FR operation technology 4. Energy saving technology 4.1 HS Waste-Gas Heat Recovery System 4.2 Gas Clearing System 5. Stable operation technology

6 2. Today s Introducing Equipment Low FR BF FR 5~10%down BFG with high pressure and temperature Hot blast HS waste-gas with large energy heat recovery system; The amount of heat recovery; 10%up Hot Stove BF Gas Cleaning System TRT output;20~30%up Gas holder

7 Gas utilization(%) NSENGI s Blast Furnace - Low FR(=High Gas Utilization)!! From these statistics, - High productivity!! High Gas Utilization!! =Low FR!! 2.Low Heat Loss NSENGI Others 3. Low FR operation technology Technologies for Low FR and High Productivity operation, 1.Efficient Reaction in Furnace Productivity(t/d/m 3 ) NSENGI Others 46 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 Inner volume(m 3 ) ,000 3,000 4,000 5,000 6,000 Inner volume(m 3 ) These dates are Japanese BFs.

8 1. Efficient Reaction in Furnace 3.Green BF- NSENGI s Technology Gas Flow is not uniform. Reaction is not efficient. Ore and coak are non-uniform Why? NSENGI s Top Charging System There are several technologies in this equipment. ex.) Technology for -Uniform center of layer -Uniform layer thickness -Uniform particle size Not ideal condition

9 3. Low FR operation technology 1. Efficient Reaction in Furnace - example Anti-Segregation Technology for Uniform center of layer and Uniform layer thickness Un-controlled Controlled No.1 No.2 No.1 No.2 Material flow control valve installed Each layer axes don t align with BF center axis. Each layer axes align with BF center axis. Center of No.2 layer (ore) Center of No.1 layer (coke)

10 1. Efficient Reaction in Furnace 3.Green BF- NSENGI s Technology Gas Gas Flow Flow is not is uniform. Reaction is not is efficient. Ore and coak are are non-uniform NSENGI s Top Charging System There are several technologies in this equipment. ex.) Technology for -Uniform layer thickness -Uniform center of layer -Uniform particle size Not ideal condition Ideal condition=nsengi s BF

11 2. Low Heat Loss 3. Low FR operation technology Blast Furnace should be cooled to prevent shell from breaking. Blast Furnace should not be cooled to decrease heat loss. Optimization of shell cooling 3zone cooling bottom cooling Many Experiences A) Heating zone B) High heat load zone C) Hearth zone These two technologies, Control zone for more than 50 years Efficient Reaction in Furnace and Low Heat Loss We know optimum shell temperature. We can make heat loss minimum!! allows for Low FR operation!!

12 4.1 HS Waste-Gas Heat Recovery System Hot blast with large energy BF Hot Stove HS waste-gas heat recovery system; The amount of heat recovery; 10%up Gas holder

13 4.1 HS Waste-Gas Heat Recovery System Combustion Air - Outlet About 160 Heat exchanger (Heat supply side) Combustion Air - inlet About 20 Heat exchanger Waste Gas inlet (Heat receiver About side) 300 Fuel Gas - inlet About 30 Benefit of Waste-Gas Heat Recovery system Waste Gas Out let About 150 Fuel Gas Outlet About % Reduction the Heat amount medium of fuel gas consumption!!

14 Heat Recovery System 4.1 HS Waste-Gas Heat Recovery System Heat transfer Heat Exchanger Conventional type : Heat Pipe type medium small pipe NSENGI s type : Heat Medium type Heat medium Flexibility of layout The amount of heat recovery Heat Pipe Water Not flexible Heat Medium type Organic Oil -Excellent thermal stability -Principal material has long been used as a fungicide for citrus fruits such as lemon. Very Flexible 1.0(base) about 1.1

15 4.2 Gas Clearing System BFG with high pressure and temperature BF Hot Stove Gas Cleaning System TRT output;20~30%up Gas holder

16 4.2 Gas Clearing System Correlation between Gas Cleaning System and TRT output Turbine NSENGI s Gas Cleaning System Septum valve 1VS 2VS Dust TRT Output is Catcher TRT Plant Generator Spray Gas -BFG temperature and pressure loss isolation are small!! valve 20~30% Thickener GAS CLEANING larger SYSTEM Blast Furnace than conventional!! Gas Holder The reduction of BFG Temperature loss BFG Pressure loss TRT output increases.

17 4.2 Gas Clearing System Wet Type(conventional type) Dry Type-Bag filter Wet type Dry type(bag filter) Temperature and pressure loss become very smaller!! The method The method for TRT removing Output dust become 20% larger!! for removing dust Water Dust Gas Bag filter No need of water Dust Gas

18 4.2 Gas Clearing System Dry Type - Multi Vessel Electrostatic Precipitator TRT Output become -10% larger than bag filter!! -30% larger than wet type!! The method for removing dust Electrostatic Force No temperature limitation

19 CONTENTS 1. About Our Company and Group 2. Today introduce technology and equipment 3. Low FR operation technology 4. Energy saving technology 4.1 HS Waste-Gas Heat Recovery System 4.2 Gas Clearing System 5. Stable operation technology

20 5. Stable operation technology CAST HOUSE Machinery TAPHOLE OPNER HOT METAL POT Cover Travercer Open taphole By 1 time Prevention of Pig interfusion into slag Tapping time is 70%UP (operation frequency :12 7times/day) Low risk of slag irruption into tuyere Low risk of hydrovolcanic explosion at granulation Adaption to Hard mud Anti-jamming control MUD GUN

21 Advanced type top charging equipment Ex,) Introduction of c Conventional type Advanced type < Tilting gears > 11 3 pieces < Chute type > Open Cylindrical closed type Developed <Characteristic in order of New to solve type> requests of customer. --For Rotation improving speed distribution : 12 rpm ( 1.5 accuracy times by of materials. conventional type ) --For Materials challenging do not a various scatter distribution method of materials.

22 Ex,) Introduction of development technology Cast-in steel pipe copper stave Conventional New type Pipe cast in copper No Plug Welds Plug Welds Welding breakage occurs for transformation by heat. No Water leakage! Large design latitude (Stable scab by Deep rib ) water leakage Target life > 25 year! Deep rib

23 Conclusion Low FR BF FR 5~10%down Stable operation BF HS waste-gas heat recovery system; The amount Hot Stove of heat recovery; 10%up Gas Cleaning System TRT output;20~30%up Gas holder

24 Thank you for your kind attention If you have some questions, please contact us using the below address or meeting at display booth of MMMM.