Falling film evaporator

Abstract

Provided is a falling film evaporator. The invention comprises an empty housing, and upper and lower pipe plates arranged at the upper and lower ends of the housing. A heat exchange pipe is arranged between the upper pipe plate and the lower pipe plate. Through holes communicated with the heat exchange pipe are arranged in the surfaces of the upper pipe plate and the lower pipe plate. An upper head is arranged at the upper end of the upper pipe plate. A feed inlet communicated to the surface of the upper pipe plate is arranged in the surface of the upper head. A lower head is arranged at the lower end of the lower pipe plate. A discharging opening is arranged at the bottom of the lower head. A heating medium inlet is arranged in the side wall, at the lower end, of the housing. A heating medium outlet is arranged in the side wall, at the upper end, of the housing. The upper head and the upper pipe plate form a cavity. A feed chamber, a guide cylinder, a first liquid distribution chamber and a second liquid distribution chamber are arranged in order from top to bottom in the cavity. The upper end of the feed chamber is communicated with the feed inlet. The lower end of the feed chamber is communicated with the guide cylinder through a connection pipe. An overflow opening is arranged at the upper end of the guide cylinder. A guide hole communicated with the second liquid distribution chamber is arranged in the surface of the first liquid distribution chamber. A guide pipe communicated with the surface of the upper pipe plate is arranged on the surface of the second liquid distribution chamber.

Description

technical field [0001] The invention relates to the field of evaporator equipment, in particular to a falling film evaporator. Background technique [0002] Falling film evaporation is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and the feed liquid is evenly distributed into each heat exchange tube, and flows down in a uniform film along the inner wall of the heat exchange tube. During the process of material liquid flowing down, the heated medium is heated and vaporized, and the generated steam and liquid phase enter the separation chamber of the evaporator together. The vapor and liquid are fully separated, and the steam enters the condenser to condense or enter the next effect evaporator as the heating medium, thereby Multi-effect operation is realized, and the liquid phase is discharged from the separation chamber. [0003] In the existing falling film evaporator, when the feed liquid is fed, it usually enters th...

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Problems solved by technology

[0003] In the existing falling film evaporator, when the feed liquid is fed, it usually enters the cavity at the upper end directly from the feed inlet at the top of the evaporator, and flows into the heat exchange tubes respectively through the through holes set on the surface of the cavity, but this feed liquid The way of entry often leads to the situation that the feed liquid cannot be distributed unevenly in the heat exchange tubes, which makes the film forming effect in the heat exchange tubes poor, and even "dry wall" phenomenon occurs when the feed liquid is serious, thus affecting the evaporation effect

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