SU1012934A1 - Mass exchange column - Google Patents

Abstract

A MASS-EXCHANGE COLUMN, including perforated plates, equipped with overflow devices and hydraulic locks placed on the underlying plate under the overflow devices, characterized in that, to increase the efficiency of mass transfer, which is stable in a wide range of loads for gas and liquid, overflow devices are placed jja are odd; along the gas of the plates, and the water traps on the even plates of the gas, while the free cross section of the perforation of the even plates is 2-7 square of the free cross section of the perforated odd plates.

Description

The invention relates to mass transfer columns and can be used in the chemical and petrochemical industries in absorption and rectification processes. The known mass exchange column, including perforated plates, equipped with overflow devices and hydraulic locks placed on the underlying plate under the overflow devices t11 The disadvantage of the known construction is the low specific mass exchange rate due to the absence of the second zone of contact fa, which in turn leads to significant separation. volumes to an unjustified increase in the height of the column apparatus. The purpose of the invention is to increase the efficiency of mass transfer, stable in a wide range of loads for gas and liquids. The goal is achieved by the fact that, in a mass transfer column comprising perforated plates equipped with overflow devices and hydraulic locks placed on the underlying plate under the overflow devices, the overflow devices are placed on oddly along the gas plates, and the hydraulic locks are even on the even gas plates. while the free cross-sectional area of the perforation of the even plates is 2-7 square free cross-sections of the perforated odd-shaped plates. FIG. 1 shows the element of the ma of the co-exchange column, general view; in fig. 2 is a section A-A in FIG. 1. The column includes a housing 1, perforated plates 2 placed in height, overflow devices 3 with hydraulics 4 and drain partitions 5, perforated plates b, with a diameter equal to the diameter of the column, attached to the bottoms of the hydraulic locks. The distance between the perforated plate and the upper edge of the drain wall 5 of the overflow device is 0.2-2 heights of the drain wall. The free section area is 2-7 areas of the free settlement of the perforated plate. On the perforated plate b, an additional hole 7 is made at an equal distance from the overflow devices 3 in a shape similar to that of the cross section of the overflow devices (rectangular. The free cross section of the aperture is 0.05-015 of the free cross section of the perforated plate. The column operates as follows. The liquid flows from the plate through the upper edge of the overflow wall of the overflow device. After passing through the overflow, the liquid comes out of the hydraulic seal 4 and enters the perforated plate 6, over which it is distributed over the entire perforated surface, forming the second phase contact zone, and flows in the form of films or jets onto the underlying plate through the perforations of the plate and hole 7. The use of an additional perforated surface allows to increase the efficiency of use of separation spaces, to create a uniform second zone of contact, to ensure the stability of the plates in a wide range of loads. The table shows the results of mass transfer column with perforated plates When differences sectional area X of free peroratsy even and odd plates.

0.42

0.4

140

0.8

0.28

Table continuation

100

0.36

0.42

140 28

0.4 0.92 0.51

3

0.92

0.51

57

about the same 0.88 0.54 100 0.7 0.6 140

1.7

3.05

28

10 3.05 1.7

57

about the same

1.8

2.95

100,140 2.23 2.0

eleven

1.95

3.35

28 1.95 3.35

57 about the same

1.98

3.25

100 2.45 140 2.2

Table continuation

0.84

1.5

 AND,

1.2

0.6

6.7

1.9 1.6

Not

1.75

- 1.2 The same - 0.84

1.5

Yes

1.2 0.6

1.9

2 yes

1.6

That, 75 1,2

- -Not

0.84

1.5

- - No 1.2 0.6

1.9

1.8No

1.6. 1.2 1.75

Also no

0.84

1.5. 1.2 0.6

The results show that the task is solved completely and the positive effect is achieved only at a ratio of 2-7.

Massive intensification due to the creation of a second phase contact zone, stable in a wide range of loads of gas liquid ho, reduces the number of trays in the ma-. in the column to reduce it.

The use of the proposed device in operating units for the synthesis of ammonia with a large capacity of 1500 tons / day allows reducing the absorber height of mono ethylamine purification of process gas from CO by 20-25% or about 10 m, and the metal consumption for one unit is 70-80 tons. Reducing the overall height of the absorber allows the device to be manufactured in a single housing, which provides additional economic advantages.

Phi1.1

Claims (1)

MASS-EXCHANGE COLUMN, including perforated plates equipped with overflow devices ^ and hydraulic locks placed on the underlying plate under overflow devices, characterized in that, in order to increase mass transfer efficiency, stable over a wide range of gas and liquid loads, overflow devices are placed ja odd along gas plates, and water locks on even plates along the gas plates, while the free cross-sectional area of the perforation of even plates is 2-7 square free cross-sectional areas of the perforation odd plates. Fig i