Summary of the invention
The object of the present invention is to provide a kind of jet tray with large liquid holdup, can overcome the shortcoming of prior art.The height of liquid layer can be adjusted in very big altitude range according to technological requirement on this column plate, has advantages such as liquid holdup is big, efficient is high, operating flexibility is big, plate pressure drop is low simultaneously, can satisfy the technological requirement of reactive distillation well.
The present invention includes injection unit on column plate, the column plate, down-flow plate, seal pot formation; The structure of injection unit is the riser of regular arrangement on column plate, the riser height can be adjusted as required, and each riser matches a jet cover is installed, and leaves the slit between jet cover and the riser, have spray-hole on the jet cover, the gas-liquid separation plate is installed in the top of jet cover.
Described down-flow plate height of weir plate can be adjusted in the 20-400mm scope;
Have regularly arranged rectangle, trapezoidal or circular plate hole on the described column plate, row's number in hole is 1-20; Open ratio of plate 1~20%, described riser height 0~300mm.
Corresponding rectangle, trapezoidal or circular riser are installed on described each plate hole, and folded angle is 45-135 ° between riser and the column plate;
Slit between described jet cover and the riser is: 1~30mm;
Described separating plate can be provided with a separating plate by 1-5 jet cover.
The present invention has following advantage, and when tray spacing was the 600mm of routine, column plate supernatant layer height can be adjusted arbitrarily in the 20-400mm scope, to satisfy reactive distillation to holding the requirement of liquid liquid measure.In this height of liquid layer scope, individual layer column plate pressure falls less than 0.6KPa simultaneously, and the void tower kinetic energy factor reaches 2.0 Pa
0.5More than, operating flexibility, column plate separative efficiency all are not less than common column plate.
The specific embodiment
Specific embodiments of the present invention are described in detail as follows with reference to accompanying drawing:
As shown in the figure, 1 down-flow plate, 2 column plates, 3 riseies, 4 jet covers, 5 separating plates, 6 tower bodies, 7 seal pots.The structure of injection unit is the riser 3 of regular arrangement on column plate 2, riser 3 highly can be adjusted as required, each riser 3 matches a jet cover 4 is installed, leave the slit between jet cover 4 and the riser 3, have spray-hole on the jet cover, gas-liquid separation plate 5 is installed in the top of jet cover 4.
Gas enters in the jet cover 4 by riser 3 from the below of column plate 2, gas need not by the liquid layer on the column plate 2, when in gas enters jet cover 4, rising, liquid enters in the jet cover by crack, 4 end of jet cover, and blown the liquid film that pulls into by gas, liquid film is broken into drop under capillary effect in by the process of gas lift.This burst gas-liquid mixed stream is by spray-hole and injection channel ejection.Gas-liquid mixed stream part by the top ejection is injected on following one deck separating plate, and remaining can be ejected on top one deck separating plate by the air rising hole on following one deck separating plate.Drop falls back to column plate 2 surfaces under the effect of gravity after cohesion on the separating plate 5, gas is then walked around separating plate 5 in the effect of pressure reduction, rises to the last layer column plate.Fall back to the liquid on the column plate 2, then flow to down one deck column plate by downspout.
Application Example:
In φ 600 experiment towers, under the normal pressure, adopt air, water system to carry out cold mould experiment, Ta Nei establishes 1 layer of common valve plate and jet tray with large liquid holdup has carried out the contrast experiment.
Common board-like tower plate structure parameter is as follows:
Down-flow plate area/tower section amasss=14.2%, open ratio of plate 8.87% (21 φ 39 holes), distance between plates 500mm, height of weir 150mm, height 50mm in crack at the bottom of the downspout.
The jet tray with large liquid holdup structural parameters are as follows:
Down-flow plate area 14.2%, open ratio of plate 8.87% (4 30 * 210 rectangular openings), distance between plates 500mm, height of weir 150mm, height 50mm in crack at the bottom of the downspout.
Regulate the gas-liquid flow, the maintenance fluid flow is 10m
3/ h measure the plate pressure drop under the different gas phase loads of two kinds of column plates, and the maximum of two kinds of column plates allows the void tower kinetic energy factor.
The contrast experiment one, and gas flow is 1000m
3/ h, the following two kinds of plate pressure drops contrast of identical empty tower gas velocity:
The column plate pattern |
Plate pressure drop, mmH
2O
|
Common board-like column plate |
180 |
Jet tray with large liquid holdup |
50 |
The contrast experiment two, and gas flow is 2000m
3/ h, two kinds of maximum void tower kinetic energy factors that allow of column plate:
The column plate pattern |
Plate pressure drop, mmH
2O
|
Common board-like column plate |
400 |
Jet tray with large liquid holdup |
60 |
By above-mentioned contrast experiment as can be seen, under the identical operations working condition, jet tray with large liquid holdup pressure drop ratio tradition valve plate is much lower, (tests one) during underload and has reduced by 72%, (tests two) during high load capacity and has reduced by 85%.
With gas phase mist entrainment 10% is the upper limit, is 2.5 to the experimental result of the permission maximum kinetic energy factor of the jet tray with large liquid holdup of air-water system.
The present invention the experiment proved that: because the effect of riser, height of liquid layer is very little to the influence that column plate pressure falls on the column plate, when tray spacing is the 600mm of routine, column plate supernatant layer height can be adjusted arbitrarily in the 20-400mm scope, simultaneously in this height of liquid layer scope, column plate pressure falls and is generally less than 0.6KPa, and the void tower kinetic energy factor reaches 2.0Pa
0.5More than, operating flexibility, column plate separative efficiency all are not less than common column plate.