Why titanium is used in heat exchanger?
Titanium Coil Heat Exchanger is a heat exchange equipment made of high-quality titanium tubes that transfers part of the heat of the hot fluid to the cold fluid.
1.Titanium plate heat exchanger has the following characteristics in design:
(1) High efficiency and energy saving: its heat transfer coefficient is 3000~4500 kcal/m^2·℃, which is 3~5 times higher than the thermal efficiency of shell and tube heat exchangers.
(2) Compact structure: The plates of the plate heat exchanger are closely arranged. Compared with other types of heat exchangers, the plate heat exchanger occupies less floor space and space, and the area of the plate heat exchanger with the same heat exchange is only It is 1/5 of the shell and tube heat exchanger.
(3) Easy to clean and disassemble: the plate heat exchanger is clamped by clamping bolts to clamp the plate, so it is easy to disassemble and can be opened for cleaning at any time.
(4) Long service life: The plate heat exchanger is pressed by stainless steel or titanium alloy plates, which can resist various corrosive impurities.
(5) Strong adaptability: The plate heat exchanger plate is an independent component, and the process can be increased or decreased at will according to the requirements, in various forms; it can be applied to the requirements of various processes.
(6) No leakage of liquid: The sealing groove of the plate heat exchanger is provided with a leakage channel, and various media will not be connected with each other. Even if there is leakage, the medium will be discharged to the outside.
2. Application of Titanium Coil Heat Exchanger
Titanium plate heat exchanger is a high-efficiency thermal equipment; at first, it was used as a continuous low temperature sterilizer, and later it was used in the food industry. Titanium and its alloys are favored by many industries for their excellent properties. Many different products are made and used in many places. At present, titanium plate heat exchangers have been widely used in petroleum, chemical, metallurgy, machinery, energy and other industrial fields, becoming a competitive variety in the heat exchanger family.
Plate Heat Exchanger
>Central heating: Due to its compact structure, easy operation and maintenance, and high heat transfer efficiency, titanium plate heat exchangers have become the preferred heat exchange products for heat exchange stations in urban central heating projects, suitable for water-water heat exchange System, steam-water heat exchange system and domestic hot water supply system, play an important role in rationally distributing heat energy and improving the level of thermal management.
>Air conditioning system: Titanium plate heat exchangers are widely used in the heat exchange of chilled water in air conditioning systems. Installing a plate heat exchanger between the cooling tower and the condenser near the condenser can act as a condenser and prevent equipment from corroding or blockage, and can save the running time of the chiller in the transition season.
>Pressure blocker for high-rise buildings: In high-rise buildings, HVAC systems that use water, ethylene glycol, etc. as heat exchange media often have extremely high static pressure, and titanium plate heat exchangers are used as pressure blockers. The high static pressure can be decomposed into several smaller pressures, thereby reducing the pressure requirements of the system on the equipment such as pumps, valves, cold and hot water units, and saving the investment cost and operating cost of the equipment.
chemical properties
Chemically, titanium exhibits good stability and good corrosion resistance in a variety of industrial solutions. Industrial pure titanium is an excellent material for refrigeration equipment accessories. Industrial pure titanium can be widely used in organic compounds, alkali solutions, salt solutions and other media, and it is not easy to react with them, and has excellent corrosion resistance; pure titanium has low concentration of hydrochloric acid, sulfuric acid, nitric acid and other inorganic acids at room temperature. Good corrosion resistance; but with the increase of medium concentration and working temperature, industrial pure titanium is prone to chemical reaction with the above inorganic acids, which reduces the corrosion resistance of titanium. Therefore, during the heat exchange process, attention should be paid to the concentration of the medium and the Operating temperature.
Industrial pure titanium has good corrosion resistance to organic acids such as formic acid, oxalic acid, and lactic acid at room temperature.
Due to the various excellent properties of industrial pure titanium, titanium heat exchangers are widely used in various seafood aquaculture, seawater heat exchange, salt water heat exchange, chemical industry, food, medicine, metallurgy, refrigeration, light industry, electroplating industry, aluminum oxidation tank, Salt, paper, ultrasonic, electronic communication, central heating and other industries and fields
Common classification: Fixed tube sheet type
The fixed tube sheet heat exchanger is to directly weld the tube sheets at both ends to the shell. It is mainly composed of shell, tube sheet, tube bundle, head and other main components. A tube bundle is arranged in the shell, both ends of the tube bundle are fixed on the tube sheet by welding, expansion joint or a combination of expansion welding methods, and the outer periphery of the tube sheet and the head flange are fastened with bolts. The fixed tube plate heat exchanger has the advantages of simple structure, low cost, easy manufacture, and convenient cleaning and maintenance of the tube side. When there is a large temperature difference between the heat exchange tube and the shell, an expansion joint should also be provided on the shell.
Floating head type: One end of the tube sheet of the floating head heat exchanger is fixed between the shell and the tube box, and the other end of the tube sheet can move freely in the shell, that is, the shell and the tube bundle can be thermally expanded freely. Therefore, there is no temperature differential stress between the tube bundle and the shell. Generally, the floating head can be disassembled, and the tube bundle can be freely extracted and loaded. This structure of the floating head heat exchanger can be used in the conditions where there is a large temperature difference between the tube bundle and the shell. The cleaning and maintenance of the tube bundle and the shell are more convenient, but its structure is relatively complex, and the requirements for sealing are relatively high.
U-tube type: U-shaped tube heat exchanger is a U-shaped heat exchange tube, and both ends are fixed on the same tube sheet. Since the shell and the heat exchange tube are separated, the heat exchange tube bundle can be freely stretched, and the temperature difference stress will not be generated due to the temperature difference of the medium. The U-shaped tube heat exchanger has only one tube sheet and no floating head, and the structure is relatively simple. The tube bundle can be freely drawn and loaded, which is convenient for cleaning, and has the advantages of floating head heat exchanger. Damage can only block the pipe. At the same time, compared with the fixed tube plate heat exchanger, because the heat exchange tube is limited by the bending radius, there is a gap in the central part of the tube bundle, and the fluid is easily short-circuited, which affects the heat transfer effect.
