The application of titanium tube in seawater desalination

Desalination has become the main mode of the Middle East and other areas where lack of water to obtain fresh water.In desalination production methods,application the most is the multi-stage flash method, the method of the equipment is mainly composed of the water heating, heat recovery condenser, heat output condenser, ventilation coagulator and injection compressor parts, such as heat exchange area use a lot of the pipe, the original use of copper alloy tube, because the copper alloy corrosion resistant, has now been replaced by titanium tube.Compared with the shell and tube heat exchanger made of titanium plate GR2 TITANIUMCN plate heat exchanger has many advantages, has a strong competitiveness in the market, is mainly used in chemical, petroleum, ships, such as desalination heat exchange system.As the Middle East and Asia power and desalination market development, the demand of thin-wall titanium welding pipe will also gradually increase, thereby giving impetus to the market demand of titanium, form new economic growth point.
Is the first choice for seawater desalination equipment heat exchanger titanium material.Currently, the main titanium application of heat pipe of seawater desalination equipment.Multi-stage flash desalination device, mature technology, high energy efficiency, 78% of the world's fresh water to build water evaporation method is adopted.Successful development of the domestic MSF device will make it become a coastal power plant boiler make-up water preferred equipment.Contact with high temperature water desalination plant in the evaporator, salinity increase after evaporation.Titanium ion corrosion resistance to high temperature, can be widely used in evaporator desalination device, at the same time, the titanium chloride has a strong corrosion resistance, is the first choice for seawater desalination equipment heat exchanger materials.In titanium material choice, is the most widely used industrial pure titanium ASTMGrade2, suggests Grade1 and Grade2 of industrial pure titanium in natural water, seawater and various kinds of chloride has a special ability to resist the influence of stress corrosion crack;But higher water heater temperature using has the high corrosive Grade7 or Grade12;Grade16 has higher corrosion resistance, but the cost is more expensive.In addition, the water flow velocity is 3 ~ 5 m/s of titanium in seawater desalination equipment, biological fouling phenomenon is the slightest, titanium heat exchanger fouling coefficient of about 0.95 ~ 0.95.
Fresh water demand is increasing, the sea area with use of Marine resources for rise, long beach and abundant cheap water resources, to the sea is a period in the future to benefit our country's a new economic growth point, the application of titanium and titanium alloy in seawater desalination wide prospect of market.

The application of titanium tube and heat treatment

Titanium alloy tube titanium cn specifications: (from 3 to 219 mm) * (0.5-15 mm) * Lmm.Titanium tube quality is light, high strength, superior mechanical properties, excellent corrosion resistance.It gf used in: aerospace, ship, automobile parts, bicycle parts, desalination of ocean engineering, mariculture, offshore oil drilling, water pipe;Ocean thermal energy conversion in the electric power industry plant, the condenser, steam turbine titanium blade;The chlor-alkali chemical oil industry, soda ash, urea, and vacuum evaporation petrochemical;Electrolysis in metallurgical industry, electroplating;Light industry of textile, paper making, fuel;Medical equipment manufacturing machine body replacement joints in medical industry;The decoration in construction industry;Manufacture of sports equipment, computer in daily life, cameras, watches, glasses, mobile phone, kitchen utensils and appliances, and handicraft manufacturing.
Titanium alloy is mainly used to produce aircraft engine compressor components, followed by the rockets and missiles and high-speed plane structure.60 s, titanium and its alloy has set up a file in the general industrial application, used for making electrode electrolysis industry, power plant condenser, oil refining and seawater desalination heater and environmental pollution control devices, etc.Titanium and its alloy has become a corrosion resistant structure materials.In addition, for the production of hydrogen storage material and shape memory alloy, etc.The titanium tube dilute acid concentration by sulfuric acid process has breakthrough innovation achievements, but the temporary restriction of sulfuric acid production of titanium tube environmental problems need to be a breakthrough.
Cold-rolled titanium plate for the material with hot rolled titanium tube, cold rolling after acid pickling to remove oxide skin, its products is hard roll, cold work hardening due to successive cold deformation makes the strength of the hard roll, increase hardness, toughness and plastic target is reduced, thus stamping performance will deteriorate, can only be used for a brief deformation parts.Hard roll can be used as the material of the hot galvanizing factory because of the hot galvanizing unit are set in front of the back.Usually in 6-13.5 - ton hard roll, titanium pipe diameter is 610 mm.Usually cold rolling plate, coil shall be through successive annealing unit (CAPL) or bell type annealing furnace eliminate cold work hardening and rolling stress, reach regulation rules of mechanics performance goals.
Solid solution and aging treatment is a main means of titanium tube heat treatment to strengthen.It is actually divided into solid solution treatment and aging treatment of two steps.Solid solution treatment is to put the titanium tube heating, heat preservation and the operation of fast cooling to room temperature.Aging treatment is after solid solution treatment, the workpiece in medium temperature range (450-550 ℃) heat preservation time after the operation of air cooling.This method can be applied to nearly alpha alloy heat treatment, alpha + compound alloy, alpha, beta, alloy and beta alloy heat treatment.Continuous casting slab or slab hot rolling the material, by step heating furnace, high pressure water descaling after entering the roughing mill, roughing expected by the cutting head, tail, and then into the finishing mill, and implementation of computer controlled rolling, after finishing by laminar cooling and coiler winding, become straight hair volume.Straight hair volume of head and tail often show tongue shape and fish shape, thickness and width accuracy is poorer, edge and ribbon folding, tower and other shortcomings.The volume weight is heavier, titanium pipe diameter is 760 mm (usually like pipe professional use).Cut straight hair volume after the head and tail cutting, trimming, and multi-channel time after finishing line disposal, straightening, smooth cutting board or heavy volume, again become namely: hot-rolled flat titanium plate, hot-rolled steel, slitting and other products.Hot rolling finishing if volume after acid pickling to remove scale and greased the hot-rolled pickling plate volumes.The product has a tendency to be part in place of manufacture, the price is moderate, favored by the vast users love.