I am doing a simulation to install an economizer to utilize the flue gas temperature going to stack. since the boiler is not available on hysys, i have choosen a furnace heater.
An economizer is usually just a heat exchanger with convection section/flue gas on one side of the exchanger and furnace feed/air preheat or some other service (eg steam generation) on the other side.
If you are preheating furnace feed or air you may need to set up a recycle operation. Usually a furnace can be simulated adequately with a Gibbs or equilibrium or conversion reactor for the combustion reaction and separate heat exchangers for the radiant duty (up to the bridge wall temperature) and each of the convection section duties. It is usually just a matte of assigning the correct UA for each convection section heat exchanger,
If you want to rigorously simulate the radiant section it is much more complex but I can also help you with that if that is necessary. If you share some more details I can probably help .
if so, the condition of flue gas is constant and a fired heater or even a heat exchanger can perform this task for you. Maybe to use aspen exchaner design and rating (EDR) for simulation/design or rating modes of the exchanger.
Yes a heat exchanger model will work fine if you specify a known set of inlet and outlet temperature the heat exchanger will calculate ua. You can use that ua as an input to predict outlet temperature with different input conditions
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