The double-tube tube-tube heat exchanger has the advantages of reliable structure, strong adaptability, convenient cleaning, maximum treatment, avoiding cross-contamination, high temperature and high pressure, no dead angle in the heat exchanger, no pollution, and easy cleaning. Small footprint and easy to install. It is a mature and standardized heat exchange equipment. In line with the GDP requirements of the pharmaceutical industry, it is an ideal heat transfer equipment for the pharmaceutical industry. 1. Made of imported 316L, the heat exchanger inner tube is 9.53x 1.0mm. 2. The inner surface is electrochemically polished, the phase roughness is Ra0.2 um-Ra0.4 um, and it is arc welded with the tube plate crab. The weld is polished. 3. Use pearl cotton to keep warm, and the outer surface is treated with 304 matt plate or wire drawing. 4, the heat exchange area has: 1, 1.5, 2, 25. 3m. Maximum working pressure: 1.0Mpa maximum working temperature: 150'C Heat transfer coefficient: water-water: 1100- 1400w (m.C) Water-steam: 2300-570/m.C )