pretreatment drum & Heating

Short Description:

PRETREATMENT DRUM & HEATING is a piece of equipment used in industrial production to pretreat raw materials. It usually consists of a rotating pretreatment barrel and a heating system. During the operation, the raw materials are put into the rotating pre-treatment barrel and heated by the heating system. This helps change the physical or chemical properties of the raw material, making it easier to handle during subsequent production processes. This kind of equipment is usually used in chemical, food processing, pharmaceutical and other industries to improve production efficiency and product quality.

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Pretreatment is the key process of hot-dip galvanizing, which has a key impact on the quality of galvanized products. Pretreatment heating includes: degreasing, rust removal, water washing, plating aid, drying process, etc.
At present, in the domestic hot-dip galvanizing industry, the concrete granite pickling tank is widely used. With the introduction of advanced hot-dip galvanizing technology in Europe and America, PP (polypropylene)/PE (polyethylene) pickling tanks are increasingly used in some automatic hot-dip galvanizing production lines.

Depending on the severity of oil stain on the workpiece surface, degreasing is eliminated in some processes.

The degreasing tank, water washing tank and plating aid tank are generally of concrete structure, and some are made of the same material as the pickling tank.

Pretreatment heating

Use the waste heat of flue gas to heat all pre-treatment tanks, including degreasing, pickling and auxiliary plating. The waste heat system includes:
1) Installation of combined heat exchanger in flue;
2) One set of PFA heat exchanger is installed at both ends of each pool;
3) Soft water system;
4) Control system.
Pretreatment heating consists of three parts:
① Flue gas heat exchanger
According to the total amount of heat to be heated, the combined flue heat exchanger is designed and manufactured, so that the heat can meet the heating requirements. If only the waste heat of the flue can not meet the heating heat demand of the pre-treatment, a set of hot air furnace can be added to ensure the flue gas volume.
The heat exchanger is made of heat-resistant stainless steel or 20 # seamless steel pipe with a new infrared nano high-temperature energy-saving anti-corrosion coating. The heat absorption energy is 140% of the heat absorbed by ordinary waste heat heat exchanger.
② PFA heat exchanger
③ Drying oven
When the product with wet surface intrudes into the zinc bath, it will cause the zinc liquid to explode and splash. Therefore, after the plating aid, the drying process should also be adopted for the parts.
Generally, the drying temperature should not exceed 100 ° C and should not be lower than 80 ° C. Otherwise, the parts can only be placed in the drying pit for a long time, which will easily cause moisture absorption of zinc chloride in the salt film of the plating aid on the surface of the parts.