Application principle of graphite falling film absorber

A graphite falling film absorber is actually a vertically mounted tubular or block hole heat exchanger. The tubes of the heat exchanger (or longitudinal channels on the modules) are equivalent to many parallel water-cooled wet-wall towers. An overflow pipe for distributing the absorbing liquid is arranged above the overflow pipe, and a gas-liquid separator is arranged below the overflow pipe.

During the absorption process, the graphite falling film absorbent continuously removes the heat of dissolution and has a good heat and mass transfer effect. Compared with the adiabatic absorption of graphite packed towers, it has obvious advantages.

Graphite falling film absorbers have the following characteristics:

1. The absorption efficiency of HCl is higher than 99.9%;

2. The pressure drop in the absorption system;

3. The high temperature of the feed gas hardly affects its operation. The temperature of the raw material entering the absorber is high and can be adjusted by the absorber

That is, it is absorbed and does not affect the final acid concentration.

4. The temperature of the acid produced is low, usually 3- higher than the temperature of the cooling water, so no post-cooling is required, which simplifies the production process;

5. Reagent grade hydrochloric acid can be produced without additional special auxiliary equipment.

6. Great flexibility in operation, easy start and stop, easy adjustment and control, which is conducive to improving working conditions;

7. Corrosion resistance, easy maintenance, long service life of equipment;

8. Compact structure, light weight, no need for a large operating surface.

Small expansion: what does the film produced in a graphite falling film absorber do

When it comes to the function of the film produced in a graphite falling film absorber, many may not be aware of it. In fact, it works like this: The liquid falls along the wall under the force of gravity, forming a thin film and coming into contact with the gas in countercurrent or cocurrent flow. The liquid film that falls along the wall can form on the flat surface of the circular tube or on the inner and outer walls of the circular tube, usually in the circular tube.