What Is Thin-walled Titanium Tubing?

Titanium coil applications cannot be used in dry chlorine. Titanium in dry chlorine, even at temperatures below 0°C, undergoes a strong chemical reaction, producing titanium tetrachloride, which is then analyzed as titanium dichloride and even burns. Titanium can only connect reliable stability in it when the water content of chlorine exceeds 0.5%.

In the production process to occur yearly high temperature wet chlorine, the temperature is between 75 ~ 90 ℃, need to be operated by cooling and drying.

In the production and assembly of the company's ionic membrane caustic soda, the main applications of titanium include: anode liquid tanks in the anode system; heaters and concentrated brine pumps in the concentrated brine system; desalination pumps, dechlorination towers, desalination dispensers, instruments and coolers in the desalination system; coolers, absorption towers and loosens for the sodium hypochlorite system; wet chlorine coolers for the chlorine treatment system; liquid level gauges in the brine system; heat exchangers and fans in the de-etching system ; lye circulation pumps, lye coolers and piping for the above systems.

When titanium equipment is contaminated with iron, it reduces its corrosion resistance, makes titanium more prone to hydrogen absorption, and causes brittle changes through the process of hydrogenation leaching. The more severe the iron contamination, the more acute the hydrogen absorption of titanium. Therefore, in the processing, transportation, installation, grinding and maintenance of titanium equipment, should try not to operate steel tools.

Titanium equipment and piping are susceptible to short spot erosion during operation, especially short spots with a width of 0.5 mm. Short erosion often occurs in the heat exchanger pipe and tube plate adjacent to the titanium and non-metallic gaskets at the dry, other at a temperature higher than 120 ℃ saturated brine is also prone to short erosion.

Prevent short erosion acceptable methods are: set up equipment and piping on the prohibition of short and stagnant areas; acceptance of titanium-palladium alloy flange welding ring, generally with titanium gaskets and titanium pack gaskets; heat exchange with titanium tubes and tube plates between the receiving strength expansion and sealing weld; saturated brine temperature control between 70-85 ℃.

Characteristics of ion membrane electrolysis alkali production process.

Ion membrane electrolysis alkali production process, the quality of brine into the tank is very high, in addition to reaching a certain concentration (305 ± 5g / L) and temperature (77.5 ± 7.5 ℃), the impurity content of the brine into the tank also has extremely stringent requirements, so the brine must be refined and heated to meet the production requirements.
Accept ionic membrane electrolysis alkali process, the production should occur yearly high-temperature wet chlorine, the temperature between 75 ~ 90 ℃, need to be operated through the cooling and drying.

Ion membrane electrolysis alkali production process, due to production reasons, electrolysis of fresh brine there will be NaOH, Na2C03, Ba2+, ClO-, C1O3- and other impurities; electrolysis of fresh brine temperature of 83-85 ° C; cathode tank produces a caustic soda concentration of 28%-32%, the temperature is 85 ° C..

NaCl in brine and NaOH, Na2C03, ClO-, C1O3- and other impurities in fresh brine, as well as high-temperature wet chlorine, caustic soda, etc. are highly erosive, and ordinary metal materials can not withstand this erosion. These identities determine in the ionic membrane electrolysis alkali production process, must be stable selection of its production assembly and pipeline materials, otherwise the production will run, risk, drip, leakage and other phenomena, seriously affect the normal production and product quantity, increase the maintenance of equipment decoration and production costs.

Second, ionic membrane caustic soda property selection of titanium equipment based on.

Titanium in the scale of ≤ 140 ℃, in various concentrations of sodium chloride solution is almost not eroded, than stainless steel 316L and copper-nickel alloy has a higher corrosion resistance; titanium has a strong passivation, can quickly repair the damaged care of the oxidized film; property of pure titanium is not sensitive to dry erosion, point erosion, intergranular erosion, stress erosion and so on. Titanium has strong corrosion resistance in high temperature wet chlorine gas. Titanium in room temperature chlorine water erosion rate of 0.00565mm/a; in 80 ℃ chlorine water, the erosion rate of 0.00431mm/a; in 95% of the wet chlorine gas, titanium at room temperature erosion rate of 0.0096mm/a.

Titanium is superior to other metals due to the poor infiltration of the profile oxide film, the profile is smooth and non-erosive, not easy to scale. Titanium's thermal conductivity is lower than carbon steel and copper, similar to stainless steel, but titanium has excellent corrosion resistance. Therefore, the wall thickness can be thinned annually, titanium's profile and steam heat transfer for drip condensation, eliminating thermal resistance, titanium's profile does not scale, so that titanium's heat transfer function advances, the appropriate construction of erosive media heat transfer equipment.

Because titanium has excellent corrosion resistance, ionic membrane caustic soda property application of titanium equipment decoration has greater benefits:First, extend the operating life of the equipment decoration, eliminating the frequency of equipment decoration and pipeline maintenance, fundamentally deal with the problem of running, bubbling, dripping, leaking, etc., saving energy and increasing the useful production time. Secondly, manipulating titanium setting equipment and pipeline can eliminate the material cost of setting equipment and pipeline and reduce the production cost. Manipulation of titanium materials, of course, the one-time investment is relatively night, but from a comprehensive point of view, in the long run is economic. The actual investment of titanium is only twice as much as that of stainless steel because of the long operating life of titanium products, thus eliminating the cost of updating and frequent maintenance of equipment and piping, which actually saves and reduces costs. Operating 1t of titanium material can yield an economic benefit of 100,000 RMB per year. Since titanium coils can handle the erosion of setup equipment and piping, erosion of setup equipment and piping is prohibited from contaminating salt water and caustic soda.