160 m/min strip continuous galvanizing line

Project name: 160 m/min strip continuous galvanizing line

Customer name: dong 'e million board industry co., LTD

The nature of the project: new project

Undertake: Beijing JieRui general contracting

A time: April 7, 2011

Production: under construction

Operation: good

A, the unit characteristics

This unit is used to produce high quality hot dip galvanized steel sheet, with annealing reduction, galvanized, finishing, and passivation etc. Function. Material selection for cold rolling hard steel coils (SPCC), SPCD, SPCE, specifications for the 800-1250 - mm x 0.18 -- 0.8 mm, maximum rate of process design unit Max. 160 m/min. Main features:

(1). Using the most advanced in the world, is widely used steel union method of production process.

(2) horizontal loop adopts four roller movable trolley, shorten the full set of loop length, and in a setting fixed deflector roll correction device, ensure the loop is not running deviation in full set.

(3) set the wash section and considering the demands of the galvanized steel strip, the use of advanced and practical combination of chemical degreasing and electrolytic degreasing technology, enhance the effect of degreasing, remove oil on the surface of the strip steel and iron powder.

(4) set reduction method light horizontal annealing furnace, the Beijing JieRui thinks its own research and development of new energy saving radiant tube technology indirect heating, heat evenly control is simple, good flatness, overcome the shortcoming of the domestic most of the unit is difficult to produce thin tape.

(5) annealing furnace adopts gas heating scheme, developed by JieRui set by Beijing's comprehensive recovery of waste heat from the system, this system can be replaced by steam (or electricity) is applied to wide range of cleaning fluid heating and hot air drying heating; Have very good use synchronization, system of boiler investment can be avoided, at the same time, according to the general estimate, with the traditional alkali and heat steam for heating way, compared to a year can save cost up to ten thousand yuan of above.

(6) annealing furnace with light fiber lining, construction fast, small thermal inertia.

(7) in furnace protection gas jet cooling device for the strip cooling, adopts frequency conversion adjustment, strip cooling speed and uniform, can meet the requirements of the galvanized strip into the pot temperature accurately, the use of special zinc nasal structure to meet the requirements of the galvanized.

(8) by Beijing JieRui's self-developed advanced QD type gas knife, coating weight and good quality control.

(9) with ceramic sensing zinc pot, to ensure the stability of solution temperature, meet the requirements of galvanized products, zinc pot induction heating, heating using flow injection ceramics has quick heating, uniform temperature, long service life and zinc less slag, etc.

(10) using four high finishing, which can effectively improve the surface quality of the product, eliminate the yield platform, improve product cold drawing performance; Set a quick roll change cars, reduce the roll change time.

(11) using two bending pose pull machine, which can effectively improve plate shape and surface quality, enhance the competitiveness of their products.

(12) and CPC, EPC system to ensure stable production unit.

(13) electric transmission control system using Siemens 6 se70 system, ac frequency conversion speed transmission, realize the tension and speed closed-loop control; PLC is powerful SIMATIC S7-400 device, good man-machine interface, simple maintenance.

(14) across the brake using electro-hydraulic brake control

Second, the basic parameters:

Raw material:

Steel types: (SPCC), SPCD, SPCE

Strip thickness: 0.18 0.80 mm

The strip width: 800-1250 - mm

Coil diameter: 508 / Φ Φ 6 lomm:

Coil diameter: Φ llOOmm - 2 loomm Φ

Coil weight: Max. 25 t

As a product:

Accord with national standard: GB/T2518-2008

Coil diameter: 508 / Φ 6 lomm Φ

Coil diameter: Φ llOOmm - Φ l500mm

Coil weight: Max. L5t

Unit speed: enter and exit section: 0-2 lom/min:

Work art piece: 0-160 - m/min;

Wear a belt speed: 30 m/min

Unit output: 180000 tons/year (estimated) specific capacity according to outline of product.

Unit layout: look from the operation side line from left to right. Sets the total length of about 238 m, the highest 11.5 m (not including cooling tower).

Three, the process unit

According to the functions and strip processing order, the unit can be divided into entrance section, process and export. Entrance section mainly include open book, shearing, welding and degreasing process, to provide clean strip continuous process; Technology mainly includes the annealing reduction, galvanized, finishing, pull and passivation etc., to complete the process for steel strip; Export complete volume classification of strip and coiling. The unit process is as follows:

Roll-up - open book - cutting head - welding - entrance looping to skim (caustic alkali scrub + electrolytic cleaning spray + + water scrub clean + water + fresh water spray) and dry hot air to annealing reduction, protection of air cooling + galvanized - air cooling and water quenching cooling - air drying - finishing - pull to passivation and hot air drying, export loop correction - cutting - winding to discharge volume, packaging.