Multi-channel outside-pipe falling film liquid distributor and heat exchange device

Abstract

The invention provides a multi-channel outside-pipe falling film liquid distributor and a heat exchange device.The multi-channel outside-pipe falling film liquid distributor is provided with a protruding shoulder, liquid can uniformly enter each overflow hole and from a liquid film on the outer wall of each falling film pipe after passing through liquid guide teeth of the overflow holes, and the protruding shoulder plays a liquid distribution effect so that the liquid can be uniformly distributed to the falling film pipes.The protruding shoulder is connected with the liquid guide teeth, the liquid guide teeth play a uniform liquid distribution effect on the falling film pipes, and the liquid reaches the outer walls of the falling film pipes along the liquid guide teeth and forms the uniform and stable liquid films on the outer walls of the falling film pipes along a main liquid flowing channel.The liquid distributor further has a settlement effect, and residues in the liquid can bee discharged out along the main liquid flowing channel to be prevented from blocking a liquid channel.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a multi-channel outer tube falling film liquid distributor and heat exchange equipment. Background technique [0002] Falling film technology is widely used in absorption, evaporation, cooling, vacuum distillation and other operations due to its advantages of large mass transfer driving force, high heat transfer coefficient and low energy consumption. Whether the falling film technology can play its advantages in the above fields largely depends on whether the liquid distribution is uniform and stable. The function of the liquid distribution device is to enable the liquid to form a uniform liquid film on the falling film tube wall after passing through the liquid distribution device, and to continuously transfer it to the entire falling film tube wall. Whether the structure of the liquid distribution device is reasonable or not directly affects the distribution of the liqu...

AI Technical Summary

Problems solved by technology

[0004] 1. Overflow distributor: the common ones are zigzag overflow weir overflow distributor, tangential drilling overflow distributor and slot overflow distributor. The processing accuracy and installation accuracy of this type of liquid distributor The requirements are high, the channel is small and easily blocked by dirt, and the function of evenly distributing the liquid to all falling film tubes cannot be realized;

[0005] 2. Plug-type distributor: the common ones are groove-type plug distributor, cone-type plug distributor, thin tube-type plug distributor and hollow ball-type plug distributor. This type of liquid distributor uses the plug and tube at the top of the pipe The gap formed between the inner walls causes the liquid to form a film. The plug-type distributor has a large flow resistance, is easy to block, and is inconvenient to install and maintain. It cannot realize the function of evenly distributing the liquid to all falling film tubes;

[0006] 3. Porous plate distributor: This type of liquid distributor installs multiple distribution plates with small holes on the top of the tube plate. The liquid passes through the baffle plate and the distribution plate, and finally distributes evenly around the tube wall to achieve the purpose of liquid distribution. The structure of this kind of distributor is simple, but the consumption of plate metal is relatively large, and it is difficult to maintain in the later stage

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