Nozzle for heat and mass transfer apparatus

 

The invention relates to a cap of heat and mass transfer devices and can be used in chemical, petrochemical and other industries for carrying out processes of distillation, absorption, etc. Nozzle consists of a single-turn spiral cylindrical or spiral bevel elements made from metal or plastic tape, the diameter and pitch of the helix, respectively, more than double the size of the width of the tape, and the pitch of the helix is less than its diameter, and the diameter of the spiral is not limited. Was made single-turn spiral-conical nozzle with a diameter of 15 mm taper 60and the helix pitch distance of 10 mm of tape width of 4 mm and a thickness of 0.15 mm, which has a specific surface area S=610 m-1when the free volume=0,96, the number of elements of the nozzle 1 m volume is n=12105that proves its high efficiency. 2 Il.

The invention relates to a cap of heat and mass transfer devices and can be used in chemical, petrochemical and other industries for carrying out processes of distillation, absorption, etc.

On regularne, made as separate elements, it is pie in the device.

Nozzle elements are made of ceramics, metal or polymeric materials. Ceramic nozzle is cheaper to manufacture, but less effective, because have worse characteristics specific surface area and free volume.

Metal filings are made of wire mesh or sheet blanks. Wire and mesh Packed items have higher values of the specific surface free volume and the holding capacity of the liquid. Increased holding capacity is related to the fact that at small inter-turn distance for the wire elements and the small cell sizes in the grids of these spaces are filled with liquid due to surface tension forces is firmly held in the free volume of the nozzle. This results in an increased period of the output device in the stationary mode and degrades the clarity of the fractional separation of multicomponent solutions. Is a consequence of the decrease of the yield of the target products by increasing the number of intermediate fractions.

In this regard, the nozzle made of sheet material or workpieces surface of the Packed items of complex shape using cutting-sheet-procurement. While a significant portion of the workpiece is not used and goes to waste, which increases the cost of the nozzle.

Known nozzles in the form of rings, however, the disadvantage of such nozzles is low efficiency due to the fact that the inner cavity is not used for the development of the specific surface of the nozzle. This disadvantage to some extent eliminated in metal Pall rings (Ramm, C. M. “gas Absorption”. M.: Chemistry, 1975) Pall Rings made from tubular blanks with tear notch side surface in several places and bend inside the ring formed by punching petals. This cap is more difficult to manufacture and, moreover, the disadvantage of it is that due to the formation of holes decreases in the value of the outer surface of the nozzle element.

Known nozzle for heat and mass transfer devices made of metal tape.with. No. 1057084, class B 01 J 19/30, 1983). This invention is closest to the proposed technical substance and accepted by us as a prototype. The nozzle along.with. No. 1057084 made of tape in the form of a ring by rotating one end 180and turn the other end of its 180in Protopopova nozzles, and filling elements of the nozzle in the apparatus in the internal cavity of one element may include connecting elements, which increases the specific surface of the nozzle. However, because the nozzle is a ring, then fill the inner volume it may not be more than one or two adjacent elements. It is not possible to effectively use the capacity for the development of the specific surface.

The objective of the invention is to increase the specific surface area and free volume of the nozzle to increase the interfacial surface contacted environments and thus improve the efficiency of the heat transfer in the device.

To solve this problem proposed nozzle for heat and mass transfer apparatus, comprising separate elements, made of ribbon, which according to the invention the metal or plastic tape manufactured spiral cylindrical or spiral-conical shape, and a nozzle made of tape in the form of a single-turn helix, the diameter and pitch of the helix, respectively, more than double the size of the width of the tape, and the pitch of the helix is less than its diameter, and the diameter of the spiral is not limited.

The nozzle is manufactured by cutting a spiral-cylindricus the open ends, and when loading them into the machine the ends of the elements are freely into the internal cavity of each other, which creates a twisted structure and provides a larger surface of the nozzle in the unit volume. To ensure maximum occupancy in the inner cavity of one of the Packed element with another element, the diameter must be greater than double the value of the width of the tape. The maximum diameter is not limited and is determined by the manufacturing technology nozzles. The pitch of the helix must be more than two values ribbon width and less than the diameter of the spiral.

In Fig.1, 2 shows a General view of the nozzle element and the nozzle in the volume.

The nozzle operates as follows. On the lattice mass transfer apparatus is put the elements of the nozzle. Due to the geometric shape of the elements of the nozzle is extremely dense filling the free volume of the device.

From the bottom through the nozzle serves vapor-gas phase, and on top of irrigate in the liquid phase. The last in the form of a film to wrap around the surface of the nozzle, thus there is heat exchange between the gas-vapor and liquid phases.

Was made single-turn spiral-conical nozzle with a diameter of 15 mm taper 60=0,96, the number of elements of the nozzle 1 m3volume is n=12105that proves its high efficiency.

For comparison, the parameters of the metal ring of nozzles of the same diameter are S=350-380 m-1,of 0.9 to 0.92, n=2.3 to 2.4105(C. M. Ramm, “gas Absorption”. M.: Chemistry, 1975).

Claims

Nozzle for heat and mass transfer apparatus, comprising separate elements, made of ribbon, characterized in that the metal or plastic tape manufactured spiral cylindrical or spiral-conical shape, and a nozzle made of tape in the form of a single-turn helix, the diameter and pitch of the helix, respectively, more than double the size of the width of the tape, and the pitch of the helix is less than its diameter.

 

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