Can a tubular heat exchanger be used for this operating condition, and how should it be selected?
Thread Content
1. Hot-side medium: Waste gas containing formaldehyde, methanol, and water vapor, at a temperature of 85°C. The exhaust gas volume is 41,000 Nm3/h, of which the water content is 750 kg/h. The gas is at slightly negative pressure. Temperature reduction requirements: Water: 85℃→35℃ ； Waste gas: 85°C → 35°C; it would be better if it could be lower. The condensed liquid must be sent to a collection tank, so the height of the liquid outlet must be ≤ 1.5 m. 2. Cold-side medium: industrial water, at room temperature, 2 barg. 3. Please provide the calculation sheet, prices, as well as the flow rate and temperature requirements for the cold-side fluid, along with the external dimensions, the net weight of the equipment, and its operating weight.
This is a standard heat exchanger calculation. Note that the conditions do not specify the concentrations of formaldehyde and methanol, and there is a requirement to cool the temperature below 35°C. The cooling medium is simply industrial water, that is, circulating water; the temperature of such water is usually around 33°C. Especially in summer, the temperature difference is too small, which requires a large heat exchange area. It is recommended to first cool the circulating water to 40°C–45°C, and then use cold water for a second stage of cooling to bring the temperature below 35°C