Four hundred thousand tons of push-pull pickling line

Project name: four hundred thousand tons of push-pull pickling 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, pickling line description

The pickling line for the push-pull type pickling line, unit adopts advanced shallow slot turbulent pickling technology at present. Provided by the process equipment and technology, it is proved by production practice, reliable, advanced, mature, stable production and can meet the buyer long-term operation of complete sets of equipment and technology. The technology has the equipment structure is reasonable, high efficiency, low production cost, convenient operation, less equipment operation fault etc.

Designed by pickling line, steel strip pickling process from open book to all coiling process are completed online. In the entrance of the unit is equipped with a feeding trolley, coil with a crane on the bench, and then feeding the small car will be transported to the uncoiler coil drum center position. Uncoiling unit adopts the cantilever uncoiler, increases and the Settings in the uncoiler drum drum hydraulic cylinder at the end of the spindle drive, uncoiler rack driven by hydraulic cylinder can be mobile on the stand, to adjust the center of the coil during uncoiling. Cutting tail cutter adopt (double hydraulic cylinder drive), to ensure the maximum shear force. Steel strip after entering pickling tank, steel strip surface and groove in hydrochloric acid solution directly on chemical reactions as follows:

Fecl3 Fe2O3 HCL + 6 = = = 2 + 3 h2o

Fe3O4 HCL + 8 = = = 2 fecl3 + FeCl2 + 4 h2o

HCL FeO + 2 = = = FeCl2 + H2O

Fe 2 + HCL = = = FeCl2 + H2 write

Pickling tank is divided into four segments, tub, for carbon steel lined with neoprene and double article granite. This structure can avoid maintenance replacement granite lining and sometimes does not destroy lined with rubber layer. Between paragraphs slot with acid squeeze dry rubber roller and acid isolation room, drain and squeeze dry rubber roller lining granite roller surface in the same plane, in the steel belt running the upper plane is equipped with a layer of granite. Squeeze roller frequency conversion driving, and can be worn by the change of the motor current detection process to take the lead position, avoid thinner steel band overlapping accumulation in the acid tank. In each period of acid tank set up a set of acid circulation heating system, heat acid using vertical heating graphite heat exchanger, the structure of the acid in the tub at the same time, the rapid flow in the form of turbulent flow, thus greatly improve the pickling speed. New acid continuous quantitatively by 4 # acid circulation can add, at the same time through acid circulation tank liquid level control system, step by step to complement to 3 #, 2 #, 1 #, finally collected by l # tank platoon to waste acid tank. Due to the isolated paragraphs pickling tank, independent circulation, therefore, can effectively control the paragraphs acid trough concentration gradient. The first paragraph separate cleaning cleaning trough. Rest 3 segments by circulating spray irrigation (condensate), add clear water is rinsed by level 4 slot into, flush water tank at the bottom of the tank cleaning set flow from level 4 step by step to 2 velvet, finally collected by level 2 the overflow mouth to the rinse water tank. The pickling tank and cleaning tank to slightly negative pressure control, by setting the import and export of the duct in the paragraphs will stand acid mist smoke to waste acid regeneration acid mist washing tower, the spray washing the back vent outside factory, emissions about l6000m3 / h, hydrogen chloride content is less than 50 mg/m3. Steel belt drying with hot air dryer, hot air heating with steam heat exchanger. Steel strip trimming the cantilever rotary shears, set up the entrance of the disc shears a pinch on the machine (CPC), control cutting edge of the removal of waste by waste while coiler will waste into waste while pellets. Coiler using cantilever tension reel, coiling tension is established through three roll drive tension machine, coiling with EPC control winding side roll. Export volume is equipped with hydraulic drive discharge coil car coil to unloading platform.

Electrical control system consists of power distribution system, ac frequency conversion motor drive unit, ac motor control unit, PLC control system, the total work station operation, points of work station, an open-book industrial monitoring system. The operation of the system controlled by PLC programmable controller is completed, the operating system also includes pickling auxiliary process chain control function of the system.

Second, followed by the production line design

1, meet the needs principles: for the product design, performance, maximum meet the requirements of users, is on the basis of investigation, analysis and forecast the market for the product design.

2, economic and reasonable principle: the design of product of advanced structure, good function, low cost, convenient operation and maintenance, in the life cycle of the products, with the lowest cost to achieve product regulation function.

3, the principle of reliability: within the use conditions and regulations stipulated time, reliable product can complete regulation functions

Degree is high.

4, optimization principle, under the given design goal, with the optimization design method, recommend the most reasonable solution to the user.

5, standardized principle: the design of product specifications and parameters meet the national standards, components of utmost and parts of the same kind of gm, parts of the same product swap as much as possible.

6, the security principle: the design of products to ensure the safety of operators and managers and safety of the equipment

And ensure the equipment on the surrounding environment, no harm; Minimize workers operation of physical and mental consumption.

7, man-machine engineering principle: make the products in use coordinated with the human body, make people in the running of the machine operation is convenient, the environment comfortable, responsive, high efficiency.

Third, design basis

Raw material cold-rolled carbon structural steel, quality carbon structural steel and low diamond roll

Steel grade Q195, Q235, ST12, STl3, (SPCC), SPCD

2 a 360 n/was l0 yield strength

The tensile strength on/was 270-61

specifications

Strip steel thickness of 1.8-4. Omm

600-1 300 MRN strip width

Raw materials diameter Φ 5 lomm/Φ 760 mm

Products inside diameter Φ lomm 6

Max Φ 2 loomm coil diameter

Min Φ 1100 mm

Single - Max 26 t steel coil products

Work plan 300 days * 24 hours

The energy of water, electricity, steam

Product form volume to the volume

400000 tons/year production plans

Four production lines, the main body of technical indicators

Process method Push-pull type shallow slot turbulent hydrochloric acid pickling

Production line arrangement Look from the side work left to right

The biggest production line process speed 120 m/min

Wear a belt speed l0-60 m/min

L0 point moving speed - 30 m/min

Unit drive for ac drive, frequency conversion speed regulation

Max 200 g/L HCl acid concentration, Fe2 + 125 g/L, 5 g/l. Fe3 +

26 s minimum pickling time

Acid tank total length of about 50 m

The total length of about 120 m units

Maximum 20 KN uncoiling tension

Maximum coiling tension 65 KN

The requirements of energy medium, and auxiliary facilities

L, electricity, unit installed capacity: about ll50kw, workshop utilities electric energy in the column.

Among them:

Main drive unit (ac frequency conversion motor) capacity: 600 kw

The unit auxiliary equipment (constant speed ac motor) capacity: 550 kw

Both the power interface controller into the line switch flowing lines, in favor of the seller the seller switch has protective and provide related capacity. Seller under control cabinet all cables and bridge are provided by the buyer.

2, compressed air: 0.4-0.6 Mpa, purification of 6 nm3 / min, the purification of 24 on the m3 / min.

3, water, wash water require the use of demineralized water. The average consumption of about 5 m3 / h.

4, steam: requires the ability to provide 6.5 t/h (P - 0.5 Mpa151 ℃ saturated steam), the actual average consumption of about 5.5 t/h.

5, emissions, of about 16000 m3 / h

6, pollution control, waste liquid, washing water is 4.5 m3 / h

7, exhaust gas: it contains HCL is less than 50 g/m3

8, crane effective lifting height: 9 m

Six, the technological process

Crane loading to the material on the bench - cart - pre uncoiling 【 roll - open book knife - pinch roll straightener (three-high) - cutting head cut - cutting Angle of cut (with waste basket) 】, uncoiler, activity telescopic guide - with pinch roll 5 roller straightening machine, cutting tail cutter (with waste car) - guide roller, manual welding platform, pinch roll, pickling tank, washing tank - blowing edge finder - after the hot air dryer, pinch roll, looping roller table (with swing arc) - centering vertical roll, pinch of cutting machine, disc, waste edge coiling machine, three roller tension roller, shearing machine, turned to the pinch roll a activity guide - reel (with roller) - activity support - discharging car - roll steel material by bench one - the crane to save volume library