JPH0157601B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a gas-liquid contact filler used in various gas-liquid contact devices. Conventionally, packing materials used in gas-liquid countercurrent contact devices such as various reaction towers, distillation towers, absorption towers, and stripping towers are bead-shaped, pellet-shaped, cylindrical, plate-shaped, or honeycomb structured. Fillers with a honeycomb structure have been used, but honeycomb structure fillers are attracting attention because of their relatively low pressure loss. In the packing made of this honeycomb structure, the liquid flowing down onto the packing from above comes into countercurrent contact with the gas rising upward from below while flowing down on the partition surface surrounding the through hole. The liquid flowing down on the partition wall surface temporarily accumulates on the lower end surface of the honeycomb structure until it becomes a droplet.
It falls as droplets, and if the filling is installed in multiple stages, it further disperses and falls onto the filling in the lower stage. However, in this case, since the lower end surface of the conventional honeycomb structured packing is flat, the liquid flowing down along the partition walls does not easily fall as droplets, and therefore accumulates near the lower end surface. The droplets temporarily block or nearly block the through-hole, causing a sudden increase in the pressure loss of the upward gas, making it difficult to maintain stable gas-liquid contact.
This method has the disadvantage of increasing operating costs, and further has the disadvantage that the droplets are not uniformly dispersed, disrupting the dropping of the liquid onto the packing immediately below, and reducing the gas-liquid contact efficiency. The present invention was made to solve the above-mentioned drawbacks, and allows stable gas-liquid contact operation with low pressure loss, as well as uniform liquid dispersion to the packing directly below, and the partition walls In a honeycomb structure having a large number of partitioned through holes parallel to each other, at least the lower end face where the through holes open, a concave portion extending across a plurality of partition walls is provided in the direction of the through holes, with the apex at the intersection of the partition walls. It is a filling for liquid contact. In the honeycomb structure of the present invention, by providing a recess extending over a plurality of partition walls in the penetration direction with the apex at the intersection of the partition walls in at least the lower end face where the through holes open, the end face of each through hole is The gas flow from the bottom, which cannot curve outward, flows along the recesses provided across multiple partitions, with the intersection of the partitions as the apex, and the liquid flows into each through hole and flows down from above. Facilitates countercurrent flow and does not impede gas flow from the bottom. In addition, since adjacent partition walls are cut at different positions, a liquid film is formed on each partition wall, which flows counter to the gas flow and prevents the opening of the through hole from being blocked. Furthermore, by forming a concave portion with the intersection of the partition walls as the apex, the liquid from the upper part is reliably diffused in directions other than the cells through which the liquid has passed through the lower end surface of the honeycomb structure. Therefore, by forming the concave portions with the intersections of the partition walls as apexes as described above, the effect of uniform dispersion is promoted. The structure of the present invention will be explained based on FIG. 1 showing a specific example. preferably alumina arranged parallel to each other, separated by
Consisting of a honeycomb structure 3 made of ceramics such as mullite or cordierite, at least the lower end surface 4a of the end surfaces 4a and 4b of the honeycomb structure 3 where the through holes 1 open, preferably have a large number of holes in the direction of penetration of the through holes 3. This is a gas-liquid contact packing provided with a conical recess 5. As shown in FIG. 1, this recess 5 is preferably provided across at least a plurality of partition walls,
It is best to provide it at the intersection of the partition walls 2. Further, it is preferable that the recesses 5 are provided adjacent to each other. Further, the large number of recesses 5 are formed at least on the lower end surface 4a of the end surfaces of the honeycomb structure 3 where the through holes 1 open.
However, it is more preferable to provide it also on the upper end surface 4b. In this case, the recess 5 between the upper end surface 4b and the lower end surface 4a
As shown in FIG. 2, it is preferable to install them at the same position above and below. Further, as described above, it is preferable that the concave portion 5 has a conical shape, but in that case, the installation angle of the conical concave portion 5 is the first
As shown in the figure, the cutting angle α is preferably 15° or more, preferably 30° to 60°. Since the gas-liquid contact packing of the present invention has the configuration described above, for example, as shown in FIG. When the gas 8 is introduced from below, the liquid and gas come into countercurrent contact in the honeycomb structure 3. In particular, the liquid flowing downward through the partition walls 2 of the honeycomb structure 3 is Since the droplets are easily dropped and discharged from the tip 9 of the recess 5 provided on the lower end surface 4a,
Since droplets do not accumulate near the lower end surface 4a, the through-hole 1 is not blocked by droplets, resulting in extremely low pressure loss. In a device as shown in FIG. 2 in which a plurality of packings having concave portions formed in the upper and lower end surfaces where the through holes of the honeycomb structure are opened are installed in the column body 6 in multiple stages, the packing material is placed in the partition walls surrounding the through holes. The flowing liquid is repeatedly dispersed in multiple directions as it flows downward, which has the effect of making gas-liquid contact more complete and uniform. Next, the effects of the present invention will be specifically described. The equivalent diameter of the through hole is 9 mm, the thickness of the partition wall is 0.8 mm, and the cross section of the through hole is square, with an outer diameter of 150 mmφ.
Forty-five recesses with a depth of 9 mm and an angle of 45° were provided on both upper and lower end surfaces of a honeycomb structure with a length of 300 mm, and these recesses were stacked in two stages in the tower body. And inside the tower from the bottom
Air containing about 1000 ppm of NH ₃ was introduced, and water was allowed to flow down from the top at an amount of 6000 (Kg/m ² ·Hr) to perform a gas-liquid countercurrent contact operation. Then, the pressure loss (mmAq/m) and ammonia absorption efficiency with respect to the gas superficial velocity U√ in that case were compared and measured. The results are shown in Table 1. For comparison, the values obtained when a filling with the same shape but without a recess is used are also listed for reference.

【table】

[Table] As is clear from the results shown in Table 1, the packing of the present invention has a pressure loss of 1/4 compared to the conventional packing.
~ Extremely low at less than 1/5, and absorption efficiency is 3 ~
It was confirmed that this was an improvement of 9%. As described above, the gas-liquid contact packing according to the present invention has a simple structure in which a large number of recesses are provided at least on the lower end surface where the through holes of the honeycomb structure open, but the pressure loss is lower than that of the conventional one. 1/4 compared to
In addition to reducing operating costs to ~1~5, uniform dispersion of the liquid greatly increases the efficiency of gas-liquid contact, reducing the required filling height and reducing device equipment costs. It is possible to
It can be used as a packing material for gas-liquid countercurrent contact devices such as various reaction towers, distillation towers, absorption towers, etc., and has extremely high practical industrial value.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a cross-section of a specific example of the packing of the present invention in use, and FIG. 2 is an explanatory diagram showing a state in which different packings of the present invention are stacked in multiple stages. DESCRIPTION OF SYMBOLS 1... Through hole, 2... Partition wall, 3... Honeycomb structure, 4a... Lower end surface of through hole, 4b... Upper end surface of through hole, 5... Recess, 6... Tower body, 7... ...Liquid, 8...Gas, 9...Tip of recess.

Claims (1)

[Claims] 1. In a honeycomb structure having a large number of mutually parallel through holes divided by partition walls, at least the lower end surface where the through holes open, a recess extending across the plurality of partition walls with the apex at the intersection of the partition walls in the direction of the through holes. A gas-liquid contact filler characterized in that: