Column-type mass exchange apparatus

FIELD: column-type mass exchange apparatus for gas, oil, chemical and allied industries; low-temperature absorption of liquid hydrocarbons from natural gas.

SUBSTANCE: proposed apparatus is provided with pipe unions delivery and discharge of gas and liquid, contact plates with passages for phases and packings located on bearing members above plates. Packings are located on bearing members above level on liquid on plates at free volume of(75-96)% and specific surface of (10-250)m2/m3. Adjacent members of packing layers directed towards plate surface are oriented towards liquid drainage. At least two crossing layers of packing are placed above each plate.

EFFECT: reduced hydraulic resistance of apparatus due to reduced volume of liquid in packing; reduced gas velocity; reduced drop entrainment.

2 dwg

 

The invention relates to column mass transfer devices and may find application in oil and gas, chemical and related industries in the implementation of mass transfer processes for gas - liquid, for example, when the low-temperature absorption of liquid hydrocarbons from natural gas.

Known column mass transfer device according to the patents of the Russian Federation 2102105, 2088297, 2102106, CL 01D 3/22 comprising a housing, a perforated grilles - contact plate placed on them by the heads, which increases the efficiency of mass transfer between gas and liquid. The disadvantage of these devices is the reduction of free space - living section of the contact plates nozzles located directly on them and overlying the holes for the passage of gas, leading to increased hydraulic resistance of the column of the apparatus and reduces its performance.

Known connecting device for vessels on the author's certificate of the Russian Federation 602203, 01D 3/20; BI No. 14 in which over contact plates installed bulk separation elements nozzles transversely to the direction of gas flow, which increases the hydraulic resistance of the gas and liquid streams.

Known apparatus for countercurrent contact of liquid with a gas according to the patent of Russian Federation №2119814, CL 01D 53/18 - protot is p, including the case, which established the contact device in the form of a perforated flops plates installed over them surround the nozzles, which is the additional mass transfer and separation zone. The disadvantage of these devices is the locking holes located in the Central part of the fluid flowing along the axis of the apparatus, where the distance between the nozzle and the plates is minimal, the inability to use these devices for vessels with large diameters (1000 mm and more). Disorganized drainage and lack of uniform distribution of the gas stream increases the hydraulic resistance of the device, reduces their productivity and efficiency.

The aim of the invention is to improve the efficiency of mass transfer and separation, the reduction of hydraulic resistance by stabilizing and alignment layer and gas-liquid flow on mass transfer device.

This goal is achieved by the fact that in the column mass transfer apparatus containing fitting supply and selection of gas and liquid contact plates with channels for the passage of phase and located above the plates on poles surround the nozzle, the nozzle located on the support elements above the fluid level on the plates and made with the free volume (75-96)%, specific surface area of 100-250 sup> 2/m3; which are used as supports overflow partition plates and the adjacent elements of the layers of the nozzle facing surface of the plate is oriented in the direction of discharge of the liquid; a nozzle overlaps the overflow liquid, and over the host of the fluid installed at least two additional overlapping layer of the nozzle, and the distance from the plate with a liquid to additional layers of the nozzle is equal to or more than the distance between the plates.

The applicant and not known to the authors design column apparatus in which the efficiency of mass transfer and separation processes, increased productivity and reduction of hydraulic resistance was achieved in a similar manner.

1 shows a General view of the column of the apparatus with the contact plates and located above them regular attachments.

Figure 2 shows the packing layer in plan, adjacent to the contact devices.

The column mass transfer apparatus (Figure 1) consists of a body 1 including the lower part 2 of larger diameter to separate the raw materials, i.e. for contacting liquid and gas flows, and the top 3 of smaller diameter to contact the gas stream with irrigated liquid and(or) its separation and filtering.

The housing 1 is equipped with a fitting gas supply system 4 and the liquid 5, the fittings gas 6 and the liquid 7.

In the lower part 2 is orpus 1 posted by:

- mass transfer plates 8 with perforations 9 for the passage of gas and modulations 10 for aspirating after its contact with the gas;

- top mass transfer plate 11, which is irrigated by the liquid through the nozzle 5;

- regular nozzle 12, consisting of elements 13, is placed above the mass transfer plates 8 and 11. The elements 13 are oriented in the direction of the overflow liquid 10 (2);

- nozzle separation section 14, is placed over the nozzle plate of the liquid supply 5.

In the upper part 3 of the housing 1 is placed in the filtering section 15 to the drain pipe 16.

The column mass transfer apparatus operates as follows.

The liquid fed through the fitting 5 on the top mass transfer plate 11, where it is distributed by the perforated surface and is in contact in countercurrent to the ascending gas flow from it are extracted high-boiling components. The gas flow on a regular nozzle 12 are distributed uniformly over the cross section of the device, on the developed surface of the nozzle destroy the foam, which is formed in contact with light hydrocarbons with high molecular liquid, separating the liquid out of it, and then served on the separation nozzle 14.

Flowing in countercurrent to the gas, the liquid wets the regular nozzle 12 having a developed surface 100-250 m2/m3with a large free volume (75-96)%, auromere distributed over the cross section of the apparatus, freed from gas bubbles (escaped), then transferred to the canvas underlying plates. To reduce the hydraulic resistance of columns for gas liquid and foam layer are sent between the elements of nozzles oriented in the direction of the overflow, while the nozzle is located above the liquid level, which reduces the hydraulic resistance in its movement.

Performing the column mass transfer device with volumetric regular nozzles located above the fluid level on the contact plate, allows to reduce the hydraulic resistance due to the reduction of the volume of liquid in the nozzle, which is not compressible, and, consequently, decrease the speed of the gas and to reduce drip out. Additionally, the hydraulic resistance is reduced when the orientation of the elements of the nozzle in the direction of draining. The nozzle is irrigated foam layer and the liquid made contact with the plates, while the developed surface contributes to the destruction of the foam. The implementation of free volume nozzles (75-96)%, and specific surface area in the range of 100-250 m2/m3practically does not increase the resistance of the contact device, eliminates the "zahlebyvayas" nozzle for increasing the efficiency of the contact device. The increase in specific surface higher than the upper limit reduces the live matter what their nozzles and free volume, consequently, increases the hydraulic resistance of the nozzle and the removal of the liquid droplet. The reduction of the surface of the nozzle below the lower limit leads to a decrease in the efficiency of the nozzle, i.e. to decrease the effectiveness of mass transfer between gas and liquid.

The column mass transfer apparatus containing fitting supply and selection of gas and liquid contact plates with channels for the passage of phase and located on the support elements on the plates surround the nozzles, wherein the nozzles are located above the fluid level on the plates, made with the free volume of 75-96% when the specific surface area of 100-250 m2/m3and the adjacent elements of the layers nozzles directed toward the surface of the plates, oriented towards the drain, and above each plate is installed, at least two overlapping layers of the nozzle.



 

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1 dwg

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FIELD: distillery industry.

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3 dwg

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