Falling film evaporator

A falling film evaporator, wherein the falling film evaporator comprises:

• a housing, the housing having a length direction and a height direction, and the housing defining an accommodating cavity;
• a gas outlet, the gas outlet being provided at an upper portion of the accommodating cavity;
• a cover, the cover being provided in the accommodating cavity and defining a cover accommodating cavity, the cover accommodating cavity having a lower cover opening, and the cover accommodating cavity being configured to accommodate at least one part of a heat exchange tube bundle;
• a gas flow channel, the gas flow channel being located between the housing and the cover and enabling the lower cover opening of the cover accommodating cavity to be in communication with the gas outlet;
• and
• a plurality of flow guide members, the plurality of flow guide members being arranged in the gas flow channel along the height direction of the housing,
• wherein, in the height direction of the housing, one of two adjacent flow guide members is connected to the housing and is separated from the cover by a first distance, and the other of the two adjacent flow guide members is connected to the cover and is separated from the housing by a second distance, and wherein each flow guide member of the plurality of flow guide members comprises a flow guide portion, the flow guide portion has a free end and a connecting end, the connecting end is connected to the housing or the cover, and, in the height direction, the connecting end is arranged lower than the free end.