Throughout the chlor‑alkali production process,equipment is exposed to highly corrosive media including wet chlorine gas,free chlorine,high‑temperature brine and strong alkalis,which set stringent requirements for corrosion resistance,structural strength and operational stability of production equipment.Conventional non‑metallic equipment such as graphite and PVC generally suffer from insufficient strength,low heat‑transfer efficiency,easy aging and leakage,short service life and high operation‑maintenance costs,and can hardly meet the high‑efficiency,energy‑saving and clean production demands of the modern chlor‑alkali industry.At present, pure titanium materials and titanium‑steel explosion‑bonded composite materials have become core corrosion‑resistant materials for upgrading chlor‑alkali units,covering the whole processes of electrolysis,cooling,brine purification and dechlorination.
In the core electrolysis section,electrodes and key tank components of metal‑anode electrolyzers and ion‑membrane electrolyzers are manufactured from titanium.Featuring stable dimensions and precise electrode gap,titanium components can effectively reduce cell voltage and power consumption,and greatly improve current efficiency and production capacity.Pressure‑bearing tank shells are largely made of titanium‑steel explosion‑bonded clad plates.The carbon‑steel base layer guarantees overall equipment strength and weldability,while the titanium cladding resists severe chloride‑ion corrosion.This material solution addresses the high‑cost pain point of all‑titanium equipment and completely avoids corrosion risks of carbon‑steel equipment,making it suitable for long‑term service under high‑temperature,high‑pressure and heavily corrosive working conditions.
In the wet‑chlorine‑gas cooling system,titanium tubular coolers and equipment with clad‑plate shells realize rapid cooling and drying of high‑temperature wet chlorine gas.They deliver high heat‑transfer efficiency and outstanding anti‑corrosion performance,effectively preventing medium‑induced corrosion and tail‑gas pollution.Compared with traditional graphite equipment,they feature smaller footprint,longer service life and lower maintenance costs.Towers,pipelines,pumps and valves used in brine preheating,vacuum dechlorination and chlorine‑gas washing sections,when fabricated with titanium and titanium‑steel composite materials,can withstand long‑term corrosion from free chlorine and high‑temperature chlorides.They extend equipment maintenance cycles,ensure the quality of recycled brine and secure sealing integrity of the whole plant.
Large‑scale adoption of titanium materials and explosion‑bonded clad plates has fundamentally solved industrial bottlenecks of conventional equipment such as high energy consumption,frequent leakage and heavy pollution.It strongly promotes energy conservation and green production in the chlor‑alkali industry,and has become the mainstream material selection for design and equipment fabrication of chlor‑alkali projects in China.
