Nickel coil heat exchanger

[ Supply status ]
One-piece bend molding, argon arc welding of interface, polishing and leveling of weld joint, acid pickling for descaling, supporting nickel flange and nickel nozzle.

[ Processing Technology ]

Blanking of pure nickel pipe → bending and forming of digital control coil → processing of pipe mouth groove → butt welding of high purity argon arc welding → NDT of welding seam → hydraulic pressure test → acid pickling and passivation treatment.

[ Material Performance ]

Pure nickel N6 is passivated and stable in high-temperature concentrated alkali, hydrofluoric acid and fluorine salt systems, free from alkali embrittlement cracking and extremely low corrosion rate; High-temperature resistance, no deformation in 300 ℃ alkaline medium for long-term use; With good plasticity, the bend is not easy to crack, and the corrosion resistance of the welding seam matches the base metal; It will not precipitate metal ions to pollute high-purity alkali liquor and electronic chemicals. It is non-magnetic and suitable for high-purity production environment.

[ Process structure ]

The whole seamless pipe is coiled and formed to reduce the welding spot and the hidden danger of leakage; Multi-layer spiral structure has sufficient heat exchange area and uniform temperature control without dead angle; Full penetration argon arc welding of pipe head and nozzle, air insulation to avoid weld oxidation and embrittlement; Conduct hydraulic pressure test on finished products one by one, and eliminate sand holes and microcracks; The surface is pickled to remove the high-temperature bending oxide layer, improve the corrosion resistance of the medium, and can be directly immersed in the strong corrosion reaction medium for use.

[ Application field ]

1. Chlor-alkali chemical: built-in cooling and heating coil for caustic soda solution and high-temperature concentrated alkali reactors;
2. Fluorine chemical industry: heat exchange and temperature control equipment for hydrofluoric acid and fluoride corrosive media;
3. Lithium battery new energy: heat exchange coil of strong alkali precursor synthesis reactor;
4. Fine chemical industry: heating and cooling device for fluorine-containing, high-alkalinity and high-purity reagent;
5. Metallurgical alkali leaching plant: alkaline leaching solution storage tank, built-in heat exchanger of reaction equipment.