In actual production, evaporators that directly contact heat transfer are sometimes used. It mixes fuel (usually gas and oil) with air and burns in a combustion chamber immersed in the solution.
The high-temperature flame and flue gas generated are directly sprayed into the evaporated solution through a nozzle in the lower part of the combustion chamber. The high-temperature gas is in direct contact with the solution, and heat transfer is carried out at the same time to evaporate and vaporize the water, and the generated water vapor and waste flue gas are discharged from the top of the evaporator together.
The immersion depth of the combustion chamber in the solution is generally 0.2 to 0.6m, and the temperature of the gas exiting the combustion chamber can reach above 1000°C.
