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, alkaline solutions, salt solutions and other media, and is not easy to react with them, and has excellent corrosion resistance; pure titanium has low concentrations 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
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 pulled out and loaded freely, 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.
