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1. INTRODUCTION
2. GENERAL GUIDING PRINCIPLES AND TECHNICAL STRATEGY
The proposed furnace should meet the requirement of high productivity, high quality and low energy consumption. The control for hydraulic, electrical, instrumentation and automation should be safe, reliable and economic. The equipment should meet production requirement when in operation and should conform to the specification of the tender documents. It should also consider rolling capacity expansion in the future.
2.1 GENERAL REQUIREMENT AND SOLUTION TO COMBUSTION SYSTEM
• The walking beam type furnace is divided into three zones: preheating zone, heating zone and soaking zone, to meet the heating requirement. the discharged billets should meet rolling requirement in terms of temperature and temperature difference. .
• Lower part of the heating zone Ι, heating zone ΙΙ and soaking zone all have side burner with big adjusting ratio and low NOx, while the upper part of heating zone Ι, heating zone ΙΙ and soaking zone all have flat flame burner.
--The side burners will have adjustable flame to ensure the temperature uniformity in the furnace width direction.
--The flat flame burners are adopted on the upper part because of lower hearth. There will be uniform temperature radiant surface formed to ensure quick heating to the furnace hearth and good heating quality to the slabs. The flames will not flushing the refractory directly and results lower scale loss.
2.2 TECHNICAL STRATEGY FOR HEATING CAPACITE
• The designed capacity should consider certain potential, so as to meet future higher capacity when rolling bigger size product. This offer is designed on the basis of 300t/h (hot charging) and consider 20% surplus for future expansion.
• The piping for air and gas should have certain surplus. The fan should have higher capacity.
2.3 TECHNICAL STRATEGY FOR HEATING QUALITY
• Heat recovery section is arranged to recovery residual heat of flue gas to preheat the billet, hence saving energy consumption.
• The atmosphere insider furnace will be strictly controlled through automatic control system to achieve minimum oxidization.
• The heating zone and soaking zone should be designed with considerable adjusting range so as to meet different heating requirement under various capacity production.
• The water beam is designed with optimal arrangement. The skid block should have good design to ensure less skid mark.
• The discharging is by extractor. The walking beam mechanism moves softly and place the billet slightly to avoid scratches on the billet surface. When the furnace requires a relatively long time shutdown, the walking beam will be stopped at the same level with fixed beam, or it can move forward to reduce billet deformation.
• Advanced instrument and computer control system are adopted to ensure accurate temperature control and prevent overheat to billet.
• Burners will be properly located and the zone length will be suitably divided to provide good heating distribution.
2.4 ENERGY SAVING MEASURES
• High efficient steel tube air preheater can preheat the combustion air to about 650ºC by recovering the heat of flue gas, thus reduce fuel consumption.
• The working surface has castable integrated structure, the furnace top, hearth and side wall are compound structure. Refractory has high thermal resistance value and good performance refractory to reduce heat loss.
• Big spacing supporting column and water piping longitudinal beam are adopted. The supporting beams and columns are well arranged to reduce surface area of water cooling piece. The supporting beam and column have refractory fiber blanket and high strength castable dual layer insulation. The cooling is water cooling.
• The walking mechanism should consider the walking beam is moving at low speed while supporting and lowering the billet. The scale loss will be lower and the impact to the insulation layer of water cooling beam will be less.
• The furnace door will be in optimal configuration. The structure will be designed with flexible opening and closing. The seal will be tight to reduce heat loss.
2.5 FURNA HEARTH MECHANICAL,HYDRAULIC SYSTEM AND SCALE REMOVAL
• The walking mechanism has dual wheel inclining rail lifting type. The lifting frame and translation frame have centering device to ensure minimum deviation in the furnace width direction. The mechanism is easy for adjusting, maintenance and operation. The foundation of translation cylinder will be set separately on the furnace hearth. The lifting frame will have mechanism to ensure synchronization.
• Hydraulic driving is adopted. The hydraulic system has stable start and stop and have little impact. The main pump and proportional valve are imported products. The hydraulic cylinder has distance sensor control. The design the component make will fully consider the conditions of other furnaces for better replacement of spares parts.
• Grease lubrication system
Double line lubrication is considered. The main equipment will be Lincoln brand.
• Scale cleaning system
The water sealing part has reliable dry scale removing device. The seal is detected by electrical water level detector. The water seal trough has water level detecting points.
The discharging side and soaksing zone hearth area has scale hopper for online scale discharging. It can also clean the scale when the furnace is in maintenance.
There will be scale chute between discharging door and discharging table for cleaning the scale fell at discharging. The scale will be discharged to scale flushing trough.
Both side of soaking zone has scale cleaning door for online and offline scale cleaning.
2.6 ELECTRICAL CONTROL AND AUTOMATION
Advanced and reliable electrical control and instrumentation equipment are adopted. The basic automation and process automation are detailed and improved to realized operation automation and material tracking.
-- automation control system
• The detecting points of temperature, pressure and flow are designed to meet control requirement and each control circuit can meet the normal production requirement for the reheating furnace.
• Safety protection system and various breakdown indication, alarm, quick cut-off control are available for the system.
• Furnace pressure and temperature auto control can be realized.
-- sequence control system
• PLC system is adopted for sequence control to realize full line tracking control from reheating area to billet discharging.
• PLC monitoring image: the reheating furnace area working conditions, various breakdown indication, furnace area equipment view will be monitored.
• The electrical and instruments should have interconnection and reserves interface with outside transmission.
--Level 2 automation
The Level 2 automation control mainly includes the tracking of billet position, identification, temperature calculation, dynamic temperature setting, coordination with rolling pace, decision making for ready for rolling, record of production status and reporting, etc.
3. DESIGN CONDITIONS AND BASIC TECHNICAL PARAMETERS
3.1 FURNACE TYPE
A walking beam reheating furnace which is used for reheating the slab with the fuel of mixed gas;
Walking beam mechanism:Two wheels on slope rail, hydraulic drive;
Charging /discharging mode: charging with pusher at charging side, discharging with extractor at discharging side;
Slab to be charged into the furnace from both the directions i.e. from left as well as from right side. Sensors etc. for measurement of slabs shall be provided accordingly.
3.2 STEEL GRADES FOR HEATING
Material of Slab Low and medium carbon steel and low alloy steel.
3.3 BILLET SIZE
Concast Route; Slabbing Mill Route;
Thickness (mm): 200/225/250, 180-250;
Width (mm) : 950-1830, 750-1850;
Length (mm): 9000-10500, 4500-5250 & 7500-10500;
Ref. Slab size 210x1280x10250mm;
Slab weight: 33T (max);
3.4 CHARGING AND DISCHARGING TEMPERATURE
Slab charge temperature: Ambient i.e. cold charged.
Slab discharge temperature:~1250ºC.
3.5 SPECIFIC CONSUMPTION:
Average fuel consumption of 0.3 MKcal/ton (with cold charging of slabs) of slab rolled on regular basis and with scale loss of max 0.6%;
3.6 HEATING QUALITY
Temp. diff. between the surface and core of the discharged slab 30ºC max. (For all points of the slab);
3.7 FUEL
Fuel to be used mixed gas of CV1650±50 to 2300 kcal/m3;
3.8 FURNACE CAPACITY
Rated output is 300t/h(with mixed gas of CV 2300kcal/Nm3;cold charging, room temperature,210 mmx1280mm x 10250mm,common carbon steel, discharging temperature 1250ºC);
Rated output is 260t/h(with mixed gas of CV 1650kcal/Nm3;cold charging, room temperature,210 mmx1280mm x 10250mm,common carbon steel, discharging temperature 1250ºC);
3.9 CONTROL LEVEL OF FURNACE
Sequence control system: the production process that the conveyance of slab from charging roll table to discharging roll table and transferring the slab before the rolling mill can realize the computer automatic control;
Combustion control system: the computer system which can realize the automation control for furnace temperature and furnace pressure;
Level 2 automation:
The main task is based on production process on the heating requirement to heat the billet inside furnace. Through optimal setting and calculation of mathematic model, each zone temperature and fuel flow will be controlled to have direct control on the heating quality.
3.10 COOLING MODE
Cooling system Skid & support Pipes: Non-Evaporative Cooling with industrial water.
Other parts of the furnace: Ordinary water cooling.
3.11 ENERGY MEDIUM
1) Fuel:
――mixed gas:
The existing HV system and substation shall be modified. The 415V power supply system shall be modified.
The HV system power supply shall be connected to reheating furnace HV equipment, like fans.
The LV power supply shall be connected to incoming cabinet of furnace proper MCC.
The power load refer to motor list.
Company Profile
| Professional Professional technical and management team with abundant experience in the implementation of domestic and international projects; |
| Responsive Responsively and meticulously, translating your needs into complete solutions; |
| Integration Integrating various technologies and resources in China and fulfilling complementary advantages, by relying on professional teams; |
| Motivation Motivated to provide the optimal solution and quality products; |
| Exceptional Exceptional, delivery and,implementation of projects to meet, your expectations; |
Our Team
Professional technical team
Prime is staffed with professional import & export team skilled with the practice of import and export business, including sea freight packing, logistics organization, L/C review, cargo booking, and customs clearance, L/C negotiation, double authentication of shipment documents, etc.
All above personnel are well experienced in the execution of projects in Southeast Asia and Middle East.
Complete procurement mechanism
Our professional team of procurement offers strict management of supplier 's qualification inspection and selection, complete system of supplier listing, rating and elimination, to ensure the supplier is qualified and capable of implementing the project and supplied with product of high quality, and maintain a healthy and good condition of credibility, contract settlement and capital flow management.
Quality management system
Our complete quality management system , the process control covering from Scheme formulation , engineering technology, detailed design, to processing and manufacturing of equipment and material , ex-factory test and site erection and commissioning till it put into production, which through multi-level inspection, tour inspection, supervision and node control can ensure quality of the final product.
Well experienced
Executive team is abundant in experience of overseas project implementation with similar project working experiences, esp. experience in Southeast Asia, Middle East projects;
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