Aluminum Fin for Air Cooling System

Evaporators for direct contact heat transfer

In actual production, the evaporator of direct contact heat transfer is sometimes applied. It is the fuel (usually gas and oil) and air mixed in the solution immersed in the combustion chamber combustion, resulting in high-temperature flame and smoke through the combustion chamber of the lower part of the nozzle sprayed directly into the solution to be evaporated. High-temperature gas and solution direct contact, while heat transfer to vaporize the water evaporation vapor, resulting in water vapor and exhaust fumes together from the top of the evaporator discharge. Its combustion chamber in the solution of the submerged depth is generally 0.2 ~ 0.6m, out of the combustion chamber of the gas temperature up to 1000 ℃ or more. Because it is direct contact heat transfer, it has good heat transfer effect and high heat utilization rate. Because there is no need for fixed heat transfer wall, so the structure is simple, especially suitable for easy crystallization, scaling and corrosive materials evaporation. In the waste acid treatment and ammonium sulfate solution evaporation, it has been widely used. However, if the evaporated material is not allowed to be contaminated by smoke, the evaporator is generally not applicable. And due to the presence of a large number of fumes, limiting the utilization of secondary vapors. In addition the nozzle is more easily damaged because it is submerged in the high temperature liquid. From the above introduction can be seen, the evaporator structure type many, each has its advantages and disadvantages and applicable occasions. In the selection, first of all to see whether it can adapt to the evaporation of the material process characteristics, including the viscosity of the material, heat-sensitive, corrosive and whether it is easy to crystallize or scaling, and then ask for its structure is simple, easy to manufacture, metal consumption is small, easy to maintain, heat transfer effect is good and so on.

Evaporator setting
Ice warehouse evaporator evaporation area calculation and other cold room evaporator calculation method is the same. Can also be based on the net area of the ice bank to match, generally according to a square meter area with 0.6 ~ 0.7m2 evaporation area. Ice storage temperature should be determined according to the variety of ice storage, storage of brine ice ice storage temperature should be -4 ℃, storage of broken ice ice storage temperature should be -18 ~ -15 ℃. In the design of the refrigeration system piping, should be considered when the ice machine does not produce ice bank can still cool down. Evaporator defrosting method can be used to manually sweep the frost.

In the setting of the evaporator for the building height below 6m of the ice bank can not be set up wall pipe, but the top row of pipes must be dispersed all over the building height of 6m or higher than 6m of the ice bank should be set up wall pipe shall not be used finned tube to prevent the stacking of ice stacks hit the bad.

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