Question: Using HTRI to calculate heat transfer in high-temperature flue gas
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I have a question: since the parameters of the high-temperature flue gas are known, I want to carry out calculations for waste heat recovery. In HTRI, the heating furnace module is used to calculate the heat exchange with the high-temperature flue gas; how can I proceed with the heat exchange calculation without performing combustion calculations? Because of the coil format, shell-and-tube models cannot be used, and there is also heat radiation heat transfer in the high-temperature flue gas. Could everyone give some advice? Thank you so much
When calculating the heat transfer of high-temperature flue gas in HTRI, if combustion calculations are not desired, known flue gas parameters can be used directly in the heat transfer module for the calculations. First, make sure you are choosing a module suitable for calculations involving high-temperature flue gases and radiation heat transfer, such as the Xfh Ultra module. Since you mentioned using a coiled tube format, it is recommended that you set appropriate tube bundle arrangements and coiled tube parameters within the module to ensure accurate simulation of the actual operating conditions and physical phenomena. At the same time, for the radiation heat transfer part, appropriate radiation properties such as absorption coefficient and emissivity should be input on the flue gas side. Then, known parameters of the high-temperature flue gas (such as temperature, pressure, flow rate, and other related thermophysical properties) are imported, along with appropriate operating conditions and boundary conditions, to perform heat transfer calculations in order to evaluate and optimize the design results. In short, the key is to select the appropriate calculation module, enter the flue gas parameters and radiation characteristics accurately, as well as use suitable coil design parameters, in order to effectively carry out high-temperature flue gas heat exchange calculations without the need for combustion calculations. If you have any questions regarding operation, it is recommended to refer to the HTRI user manual or seek professional technical support. .
When using the fired heater module in HTRI to calculate heat exchange with high-temperature flue gas, if the flue gas parameters are known and no combustion calculations are required, follow these steps: Select the module: Open HTRI and choose the fired heater module (Fired Heater). Enter flue gas parameters: In the “Stream Data” or “Flue Gas Properties” section, directly enter the known parameters of the flue gas, such as temperature, flow rate, composition, etc. Set the heat transfer conditions: In the “Heat Transfer” or “Thermal Design” section, define the heat transfer conditions, including the inlet and outlet temperatures and flow rates of the hot side (flue gas) and the cold side (the medium to be heated). Skip combustion calculation: In the “Combustion” or “Fuel Data” section, select “No Combustion” or “External Flue Gas” to skip the combustion calculation. Run simulation: After confirming that the inputs are correct, run the simulation; HTRI will directly calculate the heat transfer based on the input flue gas parameters. View results: After the simulation is completed, check the results regarding the heat exchanger’s performance, heat load, temperature distribution, etc. Through these steps, you can directly use the known flue gas parameters for heat exchange calculations, without having to perform combustion calculations.