CN111013336B - Double-cone gas collection distribution cover for gas-liquid separation and gas dispersion method - Google Patents
Double-cone gas collection distribution cover for gas-liquid separation and gas dispersion method Download PDFInfo
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- CN111013336B CN111013336B CN201911301774.7A CN201911301774A CN111013336B CN 111013336 B CN111013336 B CN 111013336B CN 201911301774 A CN201911301774 A CN 201911301774A CN 111013336 B CN111013336 B CN 111013336B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000000926 separation method Methods 0.000 title claims abstract description 24
- 239000006185 dispersion Substances 0.000 title claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims description 8
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- 238000012824 chemical production Methods 0.000 description 1
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- 238000007791 dehumidification Methods 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/324—Tray constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
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Abstract
The invention discloses a double-cone gas collecting and distributing cover for gas-liquid separation and a method for dispersing gas, wherein the double-cone gas collecting and distributing cover consists of an upper-layer conical distributing cover and a lower-layer conical gas collecting cover which are concentric with a central shaft; the upper conical distribution cover consists of a conical sieve plate with a sealed top end and a bottom annular sieve plate; the lower conical gas-collecting hood consists of a conical baffle with an open top end, a bottom annular blind plate and an inner two-stage defoaming screen plate; the double-cone gas collecting and distributing cover is fixed on the upper part of the distributing plate and communicated with the openings of the distributing plate, and the gas below the distributing plate is collected and is dispersed outwards on the conical surface of the distributing cover after liquid foam is removed. The double-cone gas collecting and distributing cover has the advantages of uniform and stable gas dispersion, wide operation elasticity and the like, is suitable for the fields of gas-liquid mass and heat transfer process and gas-liquid phase reaction and the like with large liquid-gas ratio by taking liquid as a continuous phase, and is particularly suitable for the application of separation process of easily-foamed materials.
Description
Technical Field
The invention relates to a double-cone gas collecting and distributing cover and a method for dispersing gas, which are suitable for the fields of gas-liquid mass and heat transfer process and gas-liquid phase reaction with large liquid-gas ratio by taking liquid as a continuous phase, and are particularly suitable for providing a gas dispersing method with larger operation flexibility and high efficiency for the separation process of matter containing easy foaming.
Background
In chemical production, there are many mass transfer and separation processes including gas-liquid two-phase flow, such as ordinary rectification and absorption processes mainly characterized by mass transfer, and gas humidification and dehumidification processes requiring synchronous consideration of heat and mass transfer. The processes mostly adopt operating equipment with gas as continuous phase liquid as disperse phase, generally, the retention rate of liquid in the equipment is low, the utilization efficiency of the equipment is not high, and the requirements on the separation process with low liquid flow can be met. However, for some special rectification or absorption processes, such as extractive rectification, reactive absorption, etc., the low separation efficiency of the equipment caused by the low retention rate becomes a significant problem because of the large liquid-gas ratio required in the operation. The development of a gas-liquid mass transfer device using liquid as continuous phase gas as dispersed phase is a significant research direction, but the stability of operation needs to be solved and a gas distribution device needs to be designed elaborately. In addition, in some gas-liquid reaction processes with gas participation, the reasonable design of a gas distribution device is also a key step for developing and optimizing the reactor.
For mass transfer equipment with liquid as a continuous phase, the space size is greatly reduced compared with equipment with liquid as a dispersed phase, the gas-liquid separation space of the traditional equipment is compressed, and a special defoaming component is necessary in order not to reduce the gas-liquid two-phase separation efficiency. According to the double-cone gas collecting and distributing cover provided by the invention, the two stages of defoaming screen plates are arranged in the cover, large and small liquid beads carried in gas are finely removed step by step, and the influence of liquid foam carrying can be reduced. In addition, in order to improve the stability of operation, set up the baffle between distribution cover and defoaming screen plate, the baffle has the dual function of water conservancy diversion gas and liquid of stopping concurrently, makes the gas flow steadily.
The hydraulics experiment shows that the gas tends to be condensed into larger gas masses in the double-cone gas collecting and distributing cover when rising. When the gas load is small, the gas mass concentrates on the sieve pores at the middle upper part of the conical sieve plate and is dispersed outwards, the liquid entering the distribution cover through the sieve pores at the lower part is blocked by the conical baffle plate, and the liquid is in liquid seal with the gas mass in the cover to prevent the liquid from flowing into the cover; when the gas load is increased, the gas mass is filled in the whole distribution cover, and all the conical surface sieve holes and even the sieve holes of the annular bottom plate participate in outward dispersion of the gas. Therefore, the gas collection distribution cover can improve the unstable gas distribution phenomenon caused by the change of gas load and has the capability of automatically adjusting the operation flexibility along with the gas flow.
The double-cone gas collecting and distributing cover for gas-liquid separation and the method for dispersing gas reduce the influence of liquid foam entrainment, improve the operation stability of gas load change, improve the flow mode of gas-liquid mass transfer and hopefully improve the overall effect of gas-liquid mass transfer. The detailed structure of the present invention will be described in detail in the summary of the invention and the detailed description.
Disclosure of Invention
The invention aims to provide a double-cone gas collecting and distributing cover for gas-liquid separation and a method for dispersing gas, aiming at overcoming the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: a double-cone gas collecting and distributing cover for gas-liquid separation is composed of an upper conical distributing cover and a lower conical gas collecting cover which are concentric with a central shaft; the upper conical distribution cover consists of a conical sieve plate with a sealed top end and a bottom annular sieve plate; the lower conical gas-collecting hood consists of a conical baffle with an open top end, a bottom annular blind plate and an inner two-stage defoaming screen plate; the inner two-stage defoaming screen plate consists of an upper cylindrical surface screen plate and a lower conical surface screen plate, and the middle parts of the upper cylindrical surface screen plate and the lower conical surface screen plate are connected by a round blind plate; the upper end of the cylindrical surface screen plate is connected with the upper end of the conical surface baffle plate, and the lower end of the conical surface screen plate is fixed on the inner side of the annular blind plate; the upper conical distribution cover is sleeved outside the lower conical gas-collecting cover and fixed to form a double-cone gas-collecting distribution cover element; the double-cone gas collecting and distributing cover element is fixed on the upper part of the distributing plate and communicated with the opening of the distributing plate.
Furthermore, the bottom angles of the conical screen plates in the upper conical distribution cover and the lower conical gas collection cover of the double-cone type gas collection distribution cover and the inner part of the gas collection cover are equal and are 50-75 degrees.
Furthermore, the outer diameters of the bottom ends of the upper-layer conical distribution cover and the lower-layer conical gas-collecting cover of the double-cone type gas-collecting distribution cover are equal, and the size of the upper-layer conical distribution cover and the size of the lower-layer conical gas-collecting cover are 60-120 mm.
Furthermore, the height of the lower-layer conical gas-collecting hood is 0.5-0.75 times that of the upper-layer conical distribution hood.
Furthermore, the size of the annular sieve plate at the bottom of the upper conical distribution hood is the same as that of the annular blind plate at the bottom of the lower conical gas collection hood, and the width of the ring of the annular sieve plate is 0.12-0.2 times of the outer diameter of the bottom plate (annular sieve plate/annular blind plate).
Furthermore, the specification of the round holes of the conical screen plate of the upper conical distribution cover and the bottom annular screen plate is phi 2-4.5 mm, the screen holes on the conical screen plate are arranged according to a regular triangle or a square, the screen holes on the annular screen plate are arranged at equal intervals along two concentric circles, and the hole interval is 2.5-4.5 times of the hole diameter.
Furthermore, the inner two-stage defoaming screen plate is formed by surrounding punching screen plates, the meshes are rhombic, polygonal or cross-shaped, and the like, and the upper cylindrical surface screen plate and the lower conical surface screen plate can be the same screen plate or different screen plates.
Further, the double-cone gas collecting and distributing cover is applied to a gas-liquid contact process in which liquid is a continuous phase and gas is a dispersed phase to realize gas-liquid separation, for example, to a distribution plate of a rectifying tower in a mass transfer process to realize gas-liquid separation, to a distribution plate of an absorption tower in a mass transfer process to realize gas-liquid separation, to a distribution plate of a gas-liquid reactor in a reaction process to realize gas-liquid separation, or to a distribution plate of a gas humidifier in a simultaneous heat and mass transfer process to realize gas-liquid separation.
The invention also provides a method for dispersing gas by using the double-cone gas-collecting distribution cover, which is applied to a distribution plate of a rectifying tower with liquid as a continuous phase and gas as a dispersed phase or an absorption tower with liquid as a continuous phase and gas as a dispersed phase, and comprises the following steps:
prior to operation, the entire column is filled with process liquid and a continuous liquid feed is maintained from the top of the column.
Gas enters a distribution plate, namely below a column plate, from the bottom of the column, is gathered in a double-cone gas collecting and distributing cover on the column plate, upwards passes through a conical screen plate at the lower part, enters between a two-stage defoaming screen plate and a conical baffle plate of a conical gas collecting cover at the lower layer, then is folded upwards to pass through a cylindrical screen plate, enters an upper conical distributing cover, continues upwards passes through a conical screen plate of the upper conical distributing cover, and is dispersed into fine bubbles to enter liquid outside the cover; then the gas is gathered again under the upper stage tower plate and enters the double-cone gas collecting and distributing cover of the upper stage tower plate to be dispersed again, and the gas flows upwards from plate to plate and is finally discharged from a gas phase outlet at the top of the tower.
The invention also provides a method for dispersing gas by using the double-cone gas-collecting distribution cover, which is applied to a distribution plate of a gas-liquid reactor with liquid as a continuous phase and gas as a dispersed phase or a distribution plate of a gas humidifier with liquid as a continuous phase and gas as a dispersed phase, and comprises the following steps:
the entire plant (gas-liquid reactor/gas humidifier) was flooded with process liquid before operation and a continuous liquid feed was maintained from the top of the plant.
Gas enters the lower part of the distribution plate from the bottom of the equipment, is gathered in a double-cone gas collection distribution cover on the distribution plate, upwards passes through a conical screen plate at the lower part, enters between the two-stage defoaming screen plate and the conical baffle plate of the lower conical gas collection cover, then upwards passes through a cylindrical screen plate, enters into the upper conical distribution cover, continues upwards passes through a conical screen plate of the upper conical distribution cover, is dispersed into fine bubbles, enters into liquid outside the cover, and finally is discharged from a gas phase outlet at the top of the equipment.
The invention has the beneficial effects that:
(1) the double-cone gas collecting and distributing cover is applied to gas-liquid mass transfer equipment, changes the traditional flow mode taking liquid as a dispersion phase, can increase the utilization efficiency of the equipment and prolong the retention time of the liquid, and is more beneficial to the gas-liquid contact process with larger liquid flow.
(2) The upper conical distribution cover and the lower conical gas collection cover of the double-cone type gas collection distribution cover form an annular gap channel, so that a liquid phase is prevented from entering the distribution cover under the action of a liquid seal when the gas phase flow is low, and the gas phase can rapidly pass through the cover body as a gas phase flow channel when the gas phase flow is high, thereby having the capability of adjusting the operation elasticity.
(3) The invention relates to a double-cone gas collecting and distributing cover and a method for dispersing gas, wherein liquid is used as a continuous phase, gas is used as a dispersed phase, and the gas forms an upward-inclined opposite spraying phenomenon when passing through the conical gas collecting and distributing cover, so that the increase of the disturbance degree of gas-liquid contact is facilitated, and the mass transfer efficiency is improved.
(4) The two stages of defoaming screen plates are arranged in the double-cone gas collecting and distributing cover, so that liquid beads with different sizes can be effectively removed, and the influence of liquid foam entrainment is favorably reduced.
Drawings
FIG. 1 is a block diagram of a double cone gas collecting and distributing hood;
FIG. 2 is an expanded view of a conical screen plate on the upper layer of the distribution cover;
fig. 3 is a diagram of the annular sieve plate opening of the distribution cover.
In the figure, a double-cone gas collecting and distributing cover 1, a conical gas collecting cover 2, a conical gas collecting cover 3, a conical screen plate 4, an annular screen plate 5, a conical baffle plate 6, an annular blind plate 7, a cylindrical screen plate 8, a conical screen plate 9, a circular blind plate 10, a distribution plate 11 and screen holes 12.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1-3, the invention relates to a double-cone gas collecting and distributing cover for gas-liquid separation, the double-cone gas collecting and distributing cover 1 is composed of an upper conical distributing cover 2 and a lower conical gas collecting cover 3 which are concentric with each other; the upper conical distribution cover 2 consists of a conical sieve plate 4 with a closed top end and a bottom annular sieve plate 5; the lower conical gas-collecting hood 3 consists of a conical baffle 6 with an open top end, a bottom annular blind plate 7 and an inner two-stage defoaming screen plate; the inner two-stage defoaming screen plate consists of an upper cylindrical surface screen plate 8 and a lower conical surface screen plate 9, and the middle parts of the upper cylindrical surface screen plate and the lower conical surface screen plate are connected by a round blind plate 10; the upper end of the cylindrical surface screen plate 8 is connected with the upper end of the conical surface baffle 6, and the lower end of the conical surface screen plate 9 is fixed on the inner side of the annular blind plate 7; the upper layer conical distribution cover 2 is sleeved outside the lower layer conical gas collecting cover 3 and fixed to form a double-cone type gas collecting distribution cover element. The double-cone gas collecting and distributing cover element is fixed on the upper part of the distributing plate 11 and communicated with the opening of the distributing plate 11.
Furthermore, the bottom angles of the upper conical distribution cover 2 and the lower conical gas collection cover 3 of the double-cone type gas collection distribution cover 1 and the conical screen plate 9 in the gas collection cover are equal and have the size of 50-75 degrees.
Furthermore, the outer diameters of the bottom ends of the upper conical distribution cover 2 and the lower conical gas collection cover 3 of the double-cone type gas collection and distribution cover 1 are equal, and the size is 60-120 mm.
Furthermore, the height of the lower conical gas collecting hood 3 is 0.5-0.75 times of that of the upper conical distribution hood 2.
Furthermore, the size of the annular sieve plate 5 at the bottom of the upper conical distribution hood 2 is the same as that of the annular blind plate 7 at the bottom of the lower conical gas collecting hood 3, and the width of the ring is 0.12-0.2 times of the outer diameter of the bottom plate.
Furthermore, the specification of the sieve pores 12 of the conical sieve plate 4 of the upper conical distribution cover 2 and the bottom annular sieve plate 5 is phi 2-4.5 mm, the sieve pores 12 on the conical sieve plate 4 are arranged in a regular triangle or square shape, the sieve pores 12 on the annular sieve plate 5 are arranged at equal intervals along two concentric circles, and the pore interval is 2.5-4.5 times of the pore diameter.
Furthermore, the inner two-stage defoaming screen plate is formed by surrounding punching screen plates, the meshes are rhombic, polygonal or cross-shaped, and the like, and the upper cylindrical surface screen plate 8 and the lower conical surface screen plate 9 can be the same screen plate or different screen plates.
The double-cone gas collecting and distributing cover can be applied to the gas-liquid contact process of which liquid is a continuous phase and gas is a dispersed phase to realize gas-liquid separation, for example, the double-cone gas collecting and distributing cover is applied to a distribution plate of a rectifying tower in the mass transfer process to realize gas-liquid separation, is applied to a distribution plate of an absorption tower in the mass transfer process to realize gas-liquid separation, is applied to a distribution plate of a gas-liquid reactor in the reaction process to realize gas-liquid separation, or is applied to a distribution plate of a gas humidifier in the heat and mass simultaneous transfer process to.
The invention also provides a method for dispersing gas by using the double-cone gas-collecting distribution cover, which is applied to a distribution plate of a rectifying tower with liquid as a continuous phase and gas as a dispersed phase or an absorption tower with liquid as a continuous phase and gas as a dispersed phase, and comprises the following steps:
prior to operation, the entire column is filled with process liquid and a continuous liquid feed is maintained from the top of the column.
Gas enters a distribution plate 11, namely below a tower plate, from the bottom of the tower, is collected in a double-cone gas collecting and distributing cover 1 on the tower plate and upwards passes through a conical screen plate 9 at the lower part to enter between a two-stage defoaming screen plate and a conical baffle plate 6 of a conical gas collecting cover 3 at the lower layer, then is folded upwards to pass through a cylindrical screen plate 8 to enter an upper-layer conical distributing cover 2, and continuously upwards passes through a conical screen plate 4 of the upper-layer conical distributing cover 2 to be dispersed into fine bubbles to enter liquid outside the cover; then the gas is gathered again under the upper stage tower plate and enters the double-cone gas collecting and distributing cover 1 of the upper stage tower plate to be dispersed again, and the gas flows upwards from plate to plate and is finally discharged from a gas phase outlet at the top of the tower.
The invention also provides a method for dispersing gas by using the double-cone gas-collecting distribution cover, which is applied to a distribution plate of a gas-liquid reactor with liquid as a continuous phase and gas as a dispersed phase or a distribution plate of a gas humidifier with liquid as a continuous phase and gas as a dispersed phase, and comprises the following steps:
the entire plant (gas-liquid reactor/gas humidifier) was flooded with process liquid before operation and a continuous liquid feed was maintained from the top of the plant.
Gas enters the lower part of a distribution plate 11 from the bottom of the equipment, is collected in a double-cone gas collecting and distributing cover 1 on the distribution plate 11 and upwards passes through a conical surface screen plate 9 at the lower part to enter between a two-stage defoaming screen plate and a conical surface baffle plate 6 of a lower-layer conical gas collecting cover 3, then upwards passes through a cylindrical surface screen plate 8 to enter an upper-layer conical distributing cover 2, continuously upwards passes through a conical surface screen plate 4 of the upper-layer conical distributing cover 2 to be dispersed into fine bubbles to enter liquid outside the cover, and finally is discharged from a gas phase outlet at the top of the equipment.
The structure of the present invention will be further described with reference to specific examples, but the present invention should not be construed as being limited thereto.
Example 1
Fig. 1 represents a block diagram of a double-cone gas collecting and distributing hood. Wherein, the base angle of the conical cover is 63.5 degrees, the outer diameter of the bottom end is 60mm, and the height of the upper conical distribution cover is 60 mm; the height of the lower conical gas-collecting hood is 40 mm; the size of the annular sieve plate at the bottom of the upper conical distribution cover is the same as that of the annular blind plate at the bottom of the lower conical gas-collecting cover, and the width of the annular sieve plate is 10 mm; the specification of the round holes of the conical screen plate of the upper conical distribution cover and the bottom annular screen plate is phi 2mm, the number of the round holes on the conical screen plate is 164, the round holes are arranged according to a regular triangle (figure 2, the hole interval is 6mm), the sieve holes on the annular screen plate are arranged at equal intervals along two concentric circles, and the diameters of the concentric circles are 45mm and 55mm respectively (figure 3, 22 and 28 equidistant round holes respectively).
The number of the round holes on the conical screen plate and the number of the round holes on the annular screen plate are 214 in total, and the ratio of the area of all the round holes to the area of the openings on the distribution plate is 53.5%.
Example 2
Fig. 1 represents a block diagram of a double-cone gas collecting and distributing hood. Wherein, the bottom angle of the conical cover is 63.5 degrees, the outer diameter of the bottom end is 80mm, and the height of the upper conical distribution cover is 80 mm; the height of the lower conical gas-collecting hood is 54 mm; the size of the annular sieve plate at the bottom of the upper conical distribution cover is the same as that of the annular blind plate at the bottom of the lower conical gas-collecting cover, and the width of the annular sieve plate is 13 mm; the specification of the round holes of the conical screen plate of the upper conical distribution cover and the bottom annular screen plate is phi 2.5mm, the number of the round holes on the conical screen plate is 164, the round holes are arranged according to a regular triangle (figure 2, the hole interval is 8mm), the sieve holes on the annular screen plate are arranged at equal intervals along two concentric circles, and the diameters of the concentric circles are 61mm and 73mm respectively (figure 3, 22 and 28 equidistant round holes respectively).
The number of the round holes on the conical screen plate and the number of the round holes on the annular screen plate are 214 in total, and the ratio of the area of all the round holes to the area of the openings on the distribution plate is 45.9%.
Example 3
Fig. 1 represents a block diagram of a double-cone gas collecting and distributing hood. Wherein, the base angle of the conical cover is 63.5 degrees, the outer diameter of the bottom end is 100mm, and the height of the upper conical distribution cover is 100 mm; the height of the lower conical gas-collecting hood is 68 mm; the size of the annular sieve plate at the bottom of the upper conical distribution cover is the same as that of the annular blind plate at the bottom of the lower conical gas-collecting cover, and the width of the annular sieve plate is 16 mm; the specification of the round holes of the conical screen plate of the upper conical distribution cover and the bottom annular screen plate is phi 3.5mm, the number of the round holes on the conical screen plate is 164, the round holes are arranged according to a regular triangle (figure 2, the hole interval is 10mm), the sieve holes on the annular screen plate are arranged at equal intervals along two concentric circles, and the diameters of the concentric circles are 76mm and 92mm respectively (figure 3, 22 and 28 of the equal-interval round holes respectively).
The number of the round holes on the conical screen plate and the number of the round holes on the annular screen plate are 214 in total, and the ratio of the area of all the round holes to the area of the openings on the distribution plate is 56.7%.
Example 4
Fig. 1 represents a block diagram of a double-cone gas collecting and distributing hood. Wherein, the bottom angle of the conical cover is 63.5 degrees, the outer diameter of the bottom end is 90mm, and the height of the upper conical distribution cover is 90 mm; the height of the lower conical gas-collecting hood is 60 mm; the size of the annular sieve plate at the bottom of the upper conical distribution cover is the same as that of the annular blind plate at the bottom of the lower conical gas-collecting cover, and the width of the annular sieve plate is 15 mm; the specification of the round holes of the conical screen plate of the upper conical distribution cover and the bottom annular screen plate is phi 3mm, the number of the round holes on the conical screen plate is 164, the round holes are arranged according to a regular triangle (figure 2, the hole interval is 9mm), the sieve holes on the annular screen plate are arranged at equal intervals along two concentric circles, and the diameters of the concentric circles are respectively 68mm and 82mm (figure 3, 22 and 28 of the equal-interval round holes).
The number of the round holes on the conical screen plate and the number of the round holes on the annular screen plate are 214 in total, and the ratio of the area of all the round holes to the area of the openings on the distribution plate is 53.5%.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (7)
1. A double-cone type gas collecting and distributing cover for gas-liquid separation is characterized in that the double-cone type gas collecting and distributing cover is composed of an upper conical distributing cover and a lower conical gas collecting cover which are concentric with a central shaft; the upper conical distribution cover consists of a conical sieve plate with a sealed top end and a bottom annular sieve plate; the lower conical gas-collecting hood consists of a conical baffle with an open top end, a bottom annular blind plate and an inner two-stage defoaming screen plate; the inner two-stage defoaming screen plate consists of an upper cylindrical surface screen plate and a lower conical surface screen plate, and the middle parts of the upper cylindrical surface screen plate and the lower conical surface screen plate are connected by a round blind plate; the upper end of the cylindrical surface screen plate is connected with the upper end of the conical surface baffle plate, and the lower end of the conical surface screen plate is fixed on the inner side of the annular blind plate; the upper conical distribution cover is sleeved outside the lower conical gas-collecting cover and fixed to form a double-cone gas-collecting distribution cover element; the double-cone gas collecting and distributing cover element is fixed on the upper part of the distributing plate and communicated with the opening of the distributing plate;
the double-cone gas collecting and distributing cover is applied to the gas-liquid contact process of which the liquid is a continuous phase and the gas is a dispersed phase to realize gas-liquid separation;
when the double-cone gas-collecting distribution cover is applied to a distribution plate of a rectifying tower with liquid as a continuous phase and gas as a dispersed phase, or applied to a distribution plate of an absorption tower with liquid as a continuous phase and gas as a dispersed phase, the gas-dispersing process of the distribution cover is as follows: before operation, filling the whole tower body with process liquid and keeping continuous liquid feeding from the top of the tower; gas enters a distribution plate, namely below a column plate, from the bottom of the column, is gathered in a double-cone gas collecting and distributing cover on the column plate, upwards passes through a conical screen plate at the lower part, enters between a two-stage defoaming screen plate and a conical baffle plate of a conical gas collecting cover at the lower layer, then is folded upwards to pass through a cylindrical screen plate, enters an upper conical distributing cover, continues upwards passes through a conical screen plate of the upper conical distributing cover, and is dispersed into fine bubbles to enter liquid outside the cover; then the gas is gathered again below the upper stage tower plate and enters the double-cone gas collecting distribution cover of the upper stage tower plate for secondary dispersion, and the gas flows upwards from plate to plate and is finally discharged from a gas phase outlet at the top of the tower;
when the double-cone gas collecting and distributing cover is applied to a distribution plate of a gas-liquid reactor with liquid as a continuous phase and gas as a dispersed phase or a distribution plate of a gas humidifier with liquid as a continuous phase and gas as a dispersed phase, the gas dispersing process of the distribution cover is as follows: filling the entire apparatus with process liquid prior to operation and maintaining a continuous liquid feed from the top of the apparatus; gas enters the lower part of the distribution plate from the bottom of the equipment, is gathered in a double-cone gas collection distribution cover on the distribution plate, upwards passes through a conical screen plate at the lower part, enters between the two-stage defoaming screen plate and the conical baffle plate of the lower conical gas collection cover, then upwards passes through a cylindrical screen plate, enters into the upper conical distribution cover, continues upwards passes through a conical screen plate of the upper conical distribution cover, is dispersed into fine bubbles, enters into liquid outside the cover, and finally is discharged from a gas phase outlet at the top of the equipment.
2. The double-cone gas collecting and distributing cover according to claim 1, wherein bottom angles of the conical screen plates in the upper conical distributing cover, the lower conical gas collecting cover and the gas collecting cover of the double-cone gas collecting and distributing cover are all equal and are 50-75 degrees.
3. The double-cone gas collecting and distributing cover according to claim 1, wherein the outer diameters of the bottom ends of the upper-layer conical gas collecting and distributing cover and the lower-layer conical gas collecting and distributing cover of the double-cone gas collecting and distributing cover are equal and are 60-120 mm in size.
4. The double-cone gas collecting and distributing hood according to claim 1, wherein the height of the lower conical gas collecting hood is 0.5-0.75 times that of the upper conical gas collecting hood.
5. The double-cone gas collecting and distributing hood according to claim 1, wherein the annular sieve plate at the bottom of the upper conical distributing hood is the same as the annular blind plate at the bottom of the lower conical gas collecting hood, and the width of the ring is 0.12-0.2 times of the outer diameter of the bottom plate.
6. The double-cone type gas collecting and distributing cover according to claim 1, wherein the round holes of the conical screen plate of the upper conical distributing cover and the bottom annular screen plate are 2mm to 4.5mm in diameter, the screen holes on the conical screen plate are arranged in a regular triangle or square shape, the screen holes on the annular screen plate are arranged along two concentric circles at equal intervals, and the hole interval is 2.5 times to 4.5 times of the hole diameter.
7. The double-cone gas collecting and distributing hood according to claim 1, wherein the inner two-stage defoaming screen is formed by punching screens, the meshes are polygonal or cross-shaped, and the upper cylindrical screen and the lower conical screen can be the same screen or different screens.
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| CN111870984A (en) * | 2020-08-04 | 2020-11-03 | 孙秀雪 | Chemical efficient rectifying tower |
| CN115738580A (en) * | 2021-09-03 | 2023-03-07 | 四川大学 | Combined gas distributor |
| CN114505018B (en) * | 2022-03-30 | 2023-02-28 | 山东彩客东奥化学有限公司 | BDO dehydrogenation production gamma-butyrolactone reaction apparatus for producing |
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