换热器设计（Heat exchanger design）.docVIP

换热器设计（Heat exchanger design） 1. Make a schematic diagram of the process. 2. Calculate heat exchangers for heat exchanger according to production tasks. 3. Select the hot body and find the flow of the hot body. 4. Determine the flow path of cold and hot fluid. 5. Calculate the qualitative temperature and determine the physical data of the fluid (density, specific heat, thermal conductivity, etc.). 6. Average heat transfer temperature difference. 7. Select or estimate K value according to experience or field data, and calculate the heat transfer area at first. 8. Preliminary design of the size of heat exchanger according to the newly calculated heat exchanger area. Include pipe diameter, tube length, tube number, tube number, tube arrangement, inner diameter of shell (round), etc. 9. Accounting for K. 10. Average temperature difference D. 11. Check the heat transfer of heat, requiring 15-25% margin. Calculation of pipe and shell pressure drop. Ii. Mechanical design 1. Determination of shell diameter and calculation of shell wall thickness. 2. Selection of heat exchanger seal head. 3. Selection of heat exchanger flange. 4. Determination of pipe size. 5. Calculation of pipe pulling force. 6. Selection and calculation of baffle plate. The calculation of temperature difference stress. 8. Take over, take over flange selection and open hole filling. 9. Draw the main parts drawing. Compile summary table of calculation results 4. Draw the assembly drawing of heat exchanger 5. Propose technical requirements 6. Write the design specification I. determination of heat exchange final temperature The heat transfer of heat exchanger has a great influence on heat transfer efficiency and heat transfer intensity. When the temperature of the fluid outlet is near the initial temperature of the hot fluid inlet, the heat utilization rate is high, but the heat transfer intensity is the minimum and the heat transfer area is the largest. To determine the temperature of the medium and the fina