Seeking help with the design of a finned tube heat exchanger
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The existing project requires a gas-liquid heat exchanger: the cold side features carbon dioxide gas at 0.01 MPa and -45°C, with a flow rate of 1000 kg/h; the hot side features carbon dioxide liquid at 2.1 MPa and -16°C, with a flow rate of 1500 kg/h. Previously, shell-and-tube heat exchangers were used; now, finned heat exchangers are desired to reduce the space required. Which expert can design the calculation? And can the manufacturer be provided? High score, thank you!
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Have you worked on finned heat exchangers? QQ: 595500817 for communication.
Specialized in the design and manufacture of finned tube heat exchangers for cryogenic applications.
My QQ is 595500817. Could you leave your contact information?
This post was last edited by wiseboy on 2017-2-4 20:17: “...shell-and-tube heat exchangers; now I want to use finned heat exchangers...” 1. First of all, shell heat exchangers and finned heat exchangers represent two different categories: a shell heat exchanger refers to the overall structure of the heat exchanger, while a finned heat exchanger means that the heat exchange tubes in it have fins. A shell-and-tube heat exchanger can have tubes without fins or tubes with fins; therefore, what you call a finned heat exchanger is still a type of shell-and-tube heat exchanger. Hence, your concept is incorrect. 2. Design principles: CO2 gas flows through the shell side, while the liquid flows through the tube side. The specifications for the fins need to be determined through thermal process calculations; there is no single standard for fin specifications, and several options may be suitable. I have designed dozens of such heat exchangers for projects involving food-grade carbon dioxide. 1) Tianlian Chemical’s 30,000-ton capacity plant for food-grade carbon dioxide (in operation for many years); 2) Shaanxi XX’s 50,000-ton capacity plant for food-grade carbon dioxide. . . . . . 3. It’s not difficult to manufacture: anyone can do it. The core is process and thermal design ； 4. If it’s for an actual project (contract), I can design it; if you wish, I can recommend reliable manufacturers ； If you’re practicing on problems, watch my lectures: University-Level Heat Exchanger Process Design – Practical Series of Courses (presented by Wiseboy). Note: This type of heat exchanger requires careful design.
God w. Could you recommend a manufacturer?
You didn’t clarify the heat exchange requirements: such as the temperature of the gas outlet and its phase state； Temperature and phase state of the liquid outlet. Once this is clear, I’ll design it and then have it manufactured by the factory. If you approach the manufacturer directly, there are generally technical risks, but of course there are also manufacturers who can carry out the design.
Carbon dioxide gas in the shell side: 1000 kg/h; inlet pressure: 0.01 MPa, -45℃； The outlet temperature is -25°C. Gaseous carbon dioxide liquid at 1500 kg/h: inlet pressure of 2.1 MPa, -16℃ ； The outlet temperature can be calculated. Finned-tube heat exchangers are expected to be used.
Technical requirements (description): 1. This heat exchanger is used to cool high-temperature exhaust gas; it features finned tubes, with the exhaust gas flowing outside the finned tubes while the circulating cooling water flows inside them； 2. The inlet temperature of the high-temperature exhaust gas is 90°C; the outlet parameters are designed for 20,000 m3/h at 55°C, with DN800 flanges at both the inlet and outlet ； 3. The circulating cooling water is calculated based on a maximum inlet temperature of 32°C, an outlet temperature of 37°C, and a flow rate of 35 m3/h; it is necessary to ensure the temperature reduction requirement stated in point 2. If the manufacturer has any objections to this parameter, it should be raised promptly (the flow rate of water in the cycle should not deviate too much) ； 4. The pressure drop on the gas side of the equipment should be less than 500 Pa, while the pressure drop on the water side should be less than 0.05 MPa ； 5. The equipment is made of 20# steel ；