Used 1250mm CGL

Part II unit product scheme and main technical parameters

    2.1Product positioning and production scale

1）     1) Product positioning: the product is positioned as a color coated substrate with large consumption in the market but still tense

2）     2) Production scale: 120000 T / A.

    2.2Product program

2.2.1Product specification

Hot dip galvanized coil: the thickness of strip steel is 0.25 ~ 1.2mm

Width of strip steel: 600 ~ 1250mm

2.2.2Product distribution

See table 2.2.2-1 for specific product distribution of CQ level.Table 2.2.2-1

Average specification of CQ grade: 0.45mm x1030mm

   2.3Product performance

   2.4Coating weight

Double side coating: 80 ~ 150g / m2 (double side) average coating: 120g / m2 (double side)

   2.5Plating state

No zinc flower, small zinc flower

   2.6raw material

Raw material status: cold rolled hard steel coil

Source of raw materials: steel grades purchased from domestic and foreign markets: 08Al, SPCC, SPCD

Strip thickness: 0.2 ~ 1.2mm strip width: 600 ~ 1250mm

Inner diameter of steel coil: f500mm, f610mm outer diameter of steel coil: f800mm ~ f1600mm weight of steel coil: maximum 15t

Mechanical properties: tensile strength: Max 810n / mm2 annual demand: 120000t

   2.7Main technical parameters of the unit

   2.7.1Unit speed

Inlet section: 25 ~ 140m / min

Process section: 25 ~ 120m / min

Outlet section (coiling section): 25 ~ 140m / min

Threading speed: 25m / min

   2.7.2Main process equipment parameters of the unit

Welding machine: full automatic "C" type narrow lap automatic welding machine cleaning section: alkali soaking and brushing tank: ~ 5m

Electrolytic cleaning tank: ~ 6.0m (2 groups) water brushing and spraying tank: ~ 5m

Effective storage capacity of inlet looper: ~ 210m

Effective storage capacity of outlet looper: ~ 150m

Annealing furnace capacity: CQ: 21.2t/h zinc pot: power frequency induction heating ceramic zinc pot

Capacity: 140t

Power: 2×240kw

Zinc melting rate: maximum 1.5t/h plating roller: Immersion roller: f650×1500mm

Double stabilizer roll: F200×1500mm×2 tension levelers: elongation control 0.5 ~ 2.0%

Total length of unit: about 194m

   2.8Production process flow

Winding → uncoiling → shearing → welding → chemical degreasing → electrolytic degreasing → hot water spraying → squeezing and drying → inlet looper → heating → soaking → cooling → hot dip galvanizing → small zinc flower device → air cooling after plating → water quenching and cooling after plating → drying → finishing (reserved) → tension straightening → passivation → drying → outlet looper → electrostatic oiling → surface inspection → shearing → coiling.

   2.9Characteristics of process equipment

1) The most advanced and widely used American steel union production process in the world is adopted.

2) Adopt advanced formula to produce zinc flower free products, adopt small zinc flower device to produce small zinc flower products, and reserve whole machine to produce finished zinc flower products.

3) The strip steel cleaning section is set, and the advanced and practical chemical degreasing and electrolytic degreasing technology are adopted to enhance the degreasing effect and remove the oil stain and iron powder on the surface of the strip steel.

4) The reduction bright annealing furnace is set, and the full radiant tube is used for indirect heating. The heating is uniform, the control is simple, and the shape of the plate is good, which overcomes the disadvantage that it is difficult for most domestic units to produce thin strips.

 5) The domestic advanced generator gas radiant tube burner is adopted, and the surface temperature difference of the radiant tube is small.Uniform heating of strip steel and long service life of radiant tube·The whole furnace lining still adopts light structure.The furnace lining is ceramic fiber lining, which can effectively reduce the heat storage of the furnace body and reduce the control inertia of the furnace.

 6) A number of advanced energy-saving measures have been adopted.If each radiant tube is equipped with a heat exchanger, the combustion supporting air can be preheated to about 300 ℃ by using waste gas;At the same time, the use of centralized heat exchanger to produce hot water saves energy Went to the waste heat boiler.

7) The cooling of strip steel in the furnace adopts protective gas circulating jet cooling device and frequency conversion regulation. The cooling speed of strip steel is fast and uniform, and the temperature of strip steel entering zinc pot is accurately controlled.

 8) The annealing furnace is lined with light fiber block, which has the advantages of fast furnace building, small thermal inertia and low furnace skin temperature.

9) The furnace is equipped with hot tensioning roller to realize the sectional adjustment of strip steel tension between annealing furnace and coating section.

10) The jet ceramic induction zinc pot has the advantages of fast heating, uniform temperature, long service life and less zinc slag.

11) The advanced air knife with single nozzle is adopted, and the coating weight and quality are well controlled.

12) Using domestic mature and practical two bending and one straightening tension straightener can effectively improve the shape and surface quality of strip steel plate and improve the competitiveness of products.

13) The domestic advanced electrostatic oiler is used to thin oil the strip steel to meet the requirements of color coated substrate.

14) Imported equipment shall be selected for CPC and EPC to ensure stable production of the unit.

   2.10Unit control level

The unit adopts a master PLC, the CPU selects Siemens S7414-2DP as the master station, and all DC all digital devices and remote terminals in inlet, process and outlet operation status are connected as slave stations to form a PROFIBUS-DP network, so as to share the data of the production line.Set the speed and tension on the touch screen.The industrial computer is connected with the CPU through the communication template and can display the operation of each equipment on the production line.

   2.11Plane layout and workshop lifting equipment

Unit transmission direction: left transmission

The unit is arranged in the main span: 198m long and 18m wide, and the rail surface elevation of the workshop is + 10m.

The secondary span of the workshop is 198m long and 18m wide, and the rail surface elevation of the workshop is + 10m.The front part is used as raw material warehouse and the rear part is used as finished product warehouse.

The auxiliary span is 9m wide. It is mainly arranged with fan room, electrical room, etc. the length and specific location are shown in the workshop layout plan.

Workshop main span crane: one 16 / 3.2T at the entrance, one 5T at the process section, one 5T at the high tower and one 10 / 3.2T at the exit section.

Workshop secondary span crane: one 16 / 3.2T for raw material warehouse, one 10 / 3.2T for processing plant and one 10 / 3.2T for finished product warehouse.

Auxiliary span maintenance workshop crane: 5T one

 2.12Main technical and economic indexes of the unit

Table of technical and economic indicators