Application of Titanium in Heat Exchangers: Guide to Material Selection for Class 3 Working Conditions

Titanium with excellent corrosion resistance, Widely used in industrial heat exchanger field, able to tolerate dilute sulfuric acid, Various chloride media, wet chlorine gas, Strong corrosive environment such as sea water.titanium pipeHeat exchangers are chemical, pharmacy, electric power, Core corrosion protection equipment for seawater desalination industry, the service life of that graphite heat exchange can reach 3 times of that of the graphite heat exchange, More than 5 times that of ordinary stainless steel heat exchangers.Based on years of experience in titanium projects in Baoji Titanium Valley, For three types of typical operating conditions, The idea of type selection of titanium heat exchanger, Facilitate equipment procurement and process engineer selection.

applicable scenarios, Dilute sulfuric acid concentration does not exceed 10%, Heat transfer scenarios with operating temperatures ≤100℃, Common in phosphate production, dye intermediate, Organic acid synthesis and other production lines. Recommended material TA2 industrial pure titanium, corresponding to American standard Gr2. Selection reasons, Titanium after contact with media, A dense and stable titanium dioxide passivation film is automatically formed on the surface, In this kind of dilute sulfuric acid environment, the corrosion resistance is far more than 304, 316L stainless steel.The thermal conductivity of TA2 is about 17W/m·K, and the heat transfer performance is suitable for the structure of shell-and-tube heat exchanger.The comprehensive procurement cost is controllable, and it is the material scheme with the best cost performance in dilute sulfuric acid heat exchange conditions. Typical application scenarios include dilute sulfuric acid cooler for phosphate fertilizer production line and heat exchanger for dye intermediate reaction.

Applicable scenarios: seawater cooling system, wet chlorine heat exchange, chloride salt solution concentration and other strong corrosion conditions. The recommended material is TA10 titanium containing palladium, and the palladium content is controlled within 0.12%~0.25%. Selection reasons, The addition of palladium element can ensure that titanium materials can continuously maintain passivation state in reducing medium environment, Significantly improved crevice corrosion resistance, Resistance to pitting corrosion.TA10 has a service life of more than 20 years in seawater, and TA2 has a service life of about 15 to 20 years in seawater.Although the purchase price of TA10 is 30%-50% higher than TA2, However, the overall service life of the equipment has increased by more than 50%, Long-term comprehensive cost is better. Typical applications: Seawater cooling heat exchanger in coastal power plant, wet chlorine cooling equipment in chlor-alkali industry.

Applicable scenarios: high-pressure heat exchanger of deep-sea oil and gas platform, supporting equipment of deep-sea drilling, high-pressure heat exchange section of seawater desalination. The recommended material is TC4 titanium alloy (Ti-6Al-4V). Selection reasons, The material strength of TC4 is more than twice that of TA2 commercially pure titanium., Capable of withstanding high-pressure loads in deep-sea environmentsAt the same time, it can resist high-speed seawater erosion and cavitation corrosion, and the design life of the equipment can reach more than 30 years under deep sea conditions. Typical applications: deep sea oil and gas platform heat exchanger components, deep sea drilling mud cooler.

Dilute sulfuric acid medium, temperature control within 100℃, preferably TA2;Seawater, wet chlorine, chloride salt solution conditions, recommended TA10;TC4 titanium alloy is selected for deep sea environment, high pressure and strong fluid scouring conditions;TA1 high purity industrial pure titanium can be selected for high purity production requirements of food, medicine, electronics, etc.

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