A plate-type packed distillation tower

Abstract

The present invention belongs to the technical field of chemical equipment, and specifically is a plate-type packed distillation tower, comprising a tower body, a bottom bracket, a liquid inlet pipe, a liquid outlet pipe, a gas outlet pipe, a gas inlet pipe, a ventilation plate, a liquid-passing plate, a support rod, a first sieve plate and a second sieve plate, wherein the tower body is fixedly connected to the bottom bracket, the ventilation plate and the liquid-passing plate are fixedly connected to the top and the bottom of the tower body respectively, the ventilation plate and the middle of the liquid-passing plate are fixedly connected to the support rod, the liquid inlet pipe and the gas outlet pipe are fixedly connected above the tower body, the liquid outlet pipe and the gas inlet pipe are fixedly connected below the tower body, a first sieve plate is welded to the inner wall of the tower body, a first ventilation hole and a first baffle are arranged on the first sieve plate, and the second sieve plate is welded to the support rod, when the liquid flows, it collides with the baffle plate and is dispersed, so as to further prolong the mass transfer time of the liquid and the gas, and further increase the mass transfer area of ​​the liquid and the gas.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, in particular to a plate-type packed distillation tower. Background Art

[0002] A distillation tower is a tower-type gas-liquid contact device for distillation. By utilizing the different volatilities of the components in the mixture, that is, the different vapor pressures of the components at the same temperature, the light components (low-boiling substances) in the liquid phase are transferred to the gas phase, and the heavy components (high-boiling substances) in the gas phase are transferred to the liquid phase, thereby achieving the purpose of separation. The distillation tower is also a mass transfer and heat transfer device that is widely used in petrochemical production.

[0003] The equipment used in the distillation process is called a distillation tower, which can be roughly divided into two categories: plate towers, in which the gas and liquid phases generally make multiple countercurrent contacts, and the gas and liquid phases on each plate generally make cross-flow; although the existing plate towers have a wide range of applications, simple structures, and easy maintenance, compared with packed towers, plate towers are less efficient and have a small pressure drop. They are not suitable for occasions with relatively small resistance, have high requirements for spraying volume, and the existing sieve plate apertures are too large and prone to leakage.

[0004] In view of this, in order to overcome the above technical problems, the present invention designs a plate-type packed distillation tower to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in a plate tower, the gas-liquid two phases generally make multiple countercurrent contacts, and the gas-liquid two phases generally make cross-flow on each plate; in a packed tower, the gas-liquid two phases make continuous countercurrent contacts. The plate tower has a wide range of applications, but its efficiency is low; the packed tower has a high efficiency, but has a limited application field, and cannot be used in environments with large differential pressure (prone to wall flow) and high water content in the components.

[0006] The present invention provides a plate-type packed distillation tower, comprising a tower body, a bottom bracket, a liquid inlet pipe, a liquid outlet pipe, a gas outlet pipe, a gas inlet pipe, a ventilation plate, a liquid-passing plate, a support rod, a first sieve plate and a second sieve plate, wherein the tower body is fixedly connected to the bottom bracket, the top and bottom of the tower body are respectively fixedly connected with the ventilation plate and the liquid-passing plate, the middle of the ventilation plate and the liquid-passing plate are fixedly connected with the support rod, the liquid inlet pipe and the gas outlet pipe are fixedly connected above the tower body, the liquid outlet pipe and the gas inlet pipe are fixedly connected below the tower body, a first sieve plate is welded to the upper wall of the tower body, a first ventilation hole and a first baffle are provided on the first sieve plate, a second sieve plate is welded to the support rod, a second ventilation hole and a second baffle are provided on the second sieve plate, the first sieve plate and the second sieve plate are staggered in space, and the number of the first baffle and the second baffle is more than one.

[0007] Preferably, a conical metal silo is provided below the No. 1 sieve plate and the No. 2 sieve plate, including a filler support plate, a filler pressure plate, a filler cavity and metal filler. The filler support plate is fixedly connected to the inner wall of the tower body and the support rod, and air vents and liquid flow holes are respectively provided on the bottom and sides. The filler cavity is filled with metal filler. The filler pressure plate is located above the filler support plate and fixedly connected to the filler support plate. The filler pressure plate is provided with through holes for liquid circulation.

[0008] Preferably, a protrusion is provided on the support rod in the filler cavity.

[0009] Preferably, a No. 1 elastic plate is provided on the support rod between the No. 1 sieve plate and the No. 2 sieve plate in the vertical direction, and the No. 1 elastic plate is fixedly connected to the support rod, and a No. 2 elastic plate is provided on the inner wall of the tower body between the No. 2 sieve plate and the conical metal silo in the vertical direction, and the No. 2 elastic plate is fixedly connected to the inner wall of the tower body, and the No. 2 elastic plate is inclined downward.

[0010] Preferably, the end of the No. 1 elastic plate away from the support rod is composed of more than one No. 1 elastic strip, and the end of the No. 2 elastic plate away from the tower body is composed of more than one No. 2 elastic strip.

[0011] Preferably, small balls are fixedly connected to the ends of the first elastic small plate and the second elastic small plate at intervals.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The present invention provides a plate-type packed distillation tower, wherein the first baffle plate causes the liquid to collide and disperse during the flow process, which not only increases the mass transfer area between the liquid and the gas, but also increases the mass transfer time between the liquid and the gas. After the liquid overflows from several layers of baffle plates in sequence, it continues to flow downward. When passing through the second sieve plate, part of the liquid flows down through the second vent hole, and the remaining liquid again collides and disperses with the second baffle plate during the flow, further extending the mass transfer time between the liquid and the gas, and further increasing the mass transfer area between the liquid and the gas. The liquid flows between the first sieve plate and the second sieve plate in an S-shape, further increasing the gas-liquid contact time.

[0014] 2. The present invention provides a plate-type packed distillation tower. After the liquid enters the packing cavity, the impact force of the liquid causes the metal packings to collide with each other, so that the liquid and the metal packings are fully in contact. During the collision process, the liquid is dispersed by the collision, so that the contact area between the gas and liquid entering the conical metal silo is increased. At the same time, as the liquid continues to flow into the conical metal silo, the collision between the metal packings continues, and the time of gas-liquid mass transfer is also increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1It is the main figure of the present invention;

[0017] Figure 2 is a schematic structural diagram of a first elastic plate of the present invention;

[0018] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0019] In the figure: tower body 1, bottom bracket 11, liquid inlet pipe 2, liquid outlet pipe 21, gas outlet pipe 3, gas inlet pipe 31, ventilation plate 4, liquid plate 41, support rod 42, No. 1 sieve plate 5, ventilation hole 51, No. 1 baffle plate 52, No. 1 elastic plate 53, No. 1 elastic strip 54, small ball 55, No. 2 sieve plate 6, No. 2 ventilation hole 61, No. 2 baffle plate 62, No. 2 elastic plate 63, No. 2 elastic strip 64, conical metal silo 7, filler support plate 71, filler pressure plate 72, filler cavity 73, metal filler 74, ventilation hole 711, flow hole 712, through hole 721, protrusion 731. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] The present invention provides a plate-type packed distillation tower, comprising a tower body 1, a bottom bracket 11, a liquid inlet pipe 2, a liquid outlet pipe 21, a gas outlet pipe 3, a gas inlet pipe 31, a vent plate 4, a liquid plate 41, a support rod 42, a first sieve plate 5 and a second sieve plate 6, wherein the tower body 1 is fixedly connected to the bottom bracket 11, the top and bottom of the tower body 1 are respectively fixedly connected with the vent plate 4 and the liquid plate 41, the vent plate 4 and the liquid plate 41 are fixedly connected with the support rod 42 in the middle, the liquid inlet pipe 2 The gas outlet pipe 3 is fixedly connected to the top of the tower body 1, and the liquid outlet pipe 21 and the gas inlet pipe 31 are fixedly connected to the bottom of the tower body 1. A No. 1 sieve plate 5 is welded to the inner wall of the tower body 1, and a No. 1 vent hole 51 and a No. 1 baffle plate 52 are provided on the No. 1 sieve plate 5. A No. 2 sieve plate 6 is welded to the support rod 42, and a No. 2 sieve plate 6 is provided on the No. 2 vent hole 61 and a No. 2 baffle plate 62. The No. 1 sieve plate 5 and the No. 2 sieve plate 6 are staggered in space, and the number of the No. 1 baffle plate 52 and the No. 2 baffle plate 62 is more than one.

[0022] After the plate-type packed distillation tower starts working, the liquid flows into the tower body 1 along the inner wall of the tower body 1 through the liquid inlet pipe 2 at the top of the tower body 1, and the gas enters the distillation tower through the gas inlet pipe 31 below the tower body 1, and moves upward along the distillation tower. The liquid first flows into the No. 1 sieve plate 5 along the inner wall of the tower body 1, and part of the liquid flows down through the No. 1 vent hole 51, and the rest of the liquid is blocked by the No. 1 baffle 52. The No. 1 baffle 52 causes the liquid to collide and disperse during the flow process, which not only increases the mass transfer area between the liquid and the gas, but also increases The mass transfer time of liquid and gas is prolonged. After the liquid overflows several layers of baffles in sequence, it continues to flow downward. When passing through the No. 2 sieve plate 6, part of the liquid flows down through the No. 2 air vent 61, and the remaining liquid collides with the No. 2 baffle 62 again to be dispersed during the flow, which further prolongs the mass transfer time of liquid and gas and further increases the mass transfer area of ​​liquid and gas. The flow process of the liquid between the No. 1 sieve plate 5 and the No. 2 sieve plate 6 is S-shaped, which further increases the gas-liquid contact time, thereby improving the gas-liquid mass transfer efficiency of the plate-type packed distillation tower.

[0023] As a specific embodiment of the present invention, a conical metal silo 7 is provided below the No. 1 sieve plate 5 and the No. 2 sieve plate 6, including a filler support plate 71, a filler pressure plate 72, a filler cavity 73 and a metal filler 74. The filler support plate 71 is fixedly connected to the inner wall of the tower body 1 and the support rod 42, and a vent hole 711 and a liquid flow hole 712 are respectively provided at the bottom and the side. The filler cavity 73 is filled with metal fillers. The filler pressure plate 72 is located above the filler support plate 71 and is fixedly connected to the filler support plate 71. The filler pressure plate 72 is provided with a through hole 721 for liquid circulation.

[0024] As the liquid overflows the baffle and continues to flow downward into the conical metal silo 7, the liquid enters the conical metal silo 7 through the through hole 721 on the filler pressure plate 72 and contacts the metal filler 74 in the filler cavity 73. After the liquid enters the filler cavity 73, the impact force of the liquid causes the metal fillers 74 to collide with each other, so that the liquid and the metal filler 74 are fully in contact. During the collision, the liquid is dispersed by the collision, thereby increasing the contact area between the gas and liquid entering the conical metal silo 7. At the same time, as the liquid continues to flow into the conical metal silo 7, the collision between the metal fillers 74 continues, which also increases the time of gas-liquid mass transfer and further improves the efficiency of gas-liquid mass transfer.

[0025] As a specific implementation of the present invention, a protrusion 731 is provided on the support rod 42 in the filling cavity 73 .

[0026] After the liquid enters the conical metal silo 7, the impact force of the liquid causes the metal fillers 74 in the filler cavity 73 to collide with each other, and the contact area between the liquid and the gas increases during the collision. The protrusion 731 provided in the filler cavity 73 increases the frequency of the mutual collision between the metal fillers 74 during the liquid impact, thereby further increasing the contact area between the gas-liquid two phases, extending the mass transfer time, and further improving the mass transfer efficiency between the gas and the liquid.

[0027] As a specific embodiment of the present invention, a No. 1 elastic plate 53 is provided on the support rod 42 between the No. 1 sieve plate 5 and the No. 2 sieve plate 6 in the vertical direction, and the No. 1 elastic plate 53 is fixedly connected to the support rod 42. A No. 2 elastic plate 63 is provided on the inner wall of the tower body 1 between the No. 2 sieve plate 6 and the conical metal silo 7 in the vertical direction, and the No. 2 elastic plate 63 is fixedly connected to the inner wall of the tower body 1, and the No. 2 elastic plate 63 is inclined downward, and the No. 1 elastic plate 53 and the No. 2 elastic plate 63 have the same structure.

[0028] During the liquid flow process, the liquid passing through is bounced by the No. 1 elastic plate 53 arranged between the No. 1 sieve plate 5 and the No. 2 sieve plate 6, the No. 2 elastic plate 63 between the No. 2 sieve plate 6 and the conical metal silo 7, and the No. 1 elastic plate 53 and the No. 2 elastic plate 63. The bounced liquid is dispersed to further increase the area of ​​gas-liquid mass transfer and further extend the mass transfer time. The No. 2 elastic plate 63 is tilted downward, which is beneficial for the liquid on the inner wall of the tower body 1 to flow back to the middle of the tower body 1 to continue to participate in mass transfer, thereby further improving the mass transfer efficiency between the gas-liquid two phases.

[0029] As a specific embodiment of the present invention, the end of the No. 1 elastic plate 53 away from the support rod 42 is composed of more than one No. 1 elastic strip 54, and the end of the No. 2 elastic plate 63 away from the tower body 1 is composed of more than one No. 2 elastic strip 64, and the No. 1 elastic strip 54 and the No. 2 elastic strip 64 have the same structure.

[0030] By setting one or more No. 1 elastic strips 54 at one end of the No. 1 elastic plate 53 away from the support rod 42, and setting one or more No. 2 elastic strips 64 at one end of the No. 2 elastic plate 63 away from the tower body 1, the No. 1 elastic strips 54 and the No. 2 elastic strips 64 shake during the downward flow of liquid and the upward flow of gas, so that the bounced liquid is dispersed by the constantly shaking No. 1 elastic strips 54 and No. 2 elastic strips 64, so that the mass transfer area between liquid and gas is further increased, the time is further extended, and the actual use effect of the plate-type packed distillation tower is improved.

[0031] As a specific implementation of the present invention, small balls 55 are fixedly connected at intervals at the ends of the first elastic small plate 54 and the second elastic small plate 64 .

[0032] When the gas and liquid cause the first elastic strip 54 and the second elastic strip 64 to vibrate, the small balls 55 arranged at the ends of the first elastic plate 53 and the second elastic plate 63 make the first elastic strip 54 and the second elastic strip 64 vibrate more violently, and the liquid is further broken up, thereby further extending the mass transfer time, increasing the mass transfer area, and further improving the actual use effect of the plate-type packed distillation tower.

[0033] The specific workflow is as follows:

[0034] After the plate-type packing distillation tower starts working, the liquid flows into the tower body 1 along the inner wall of the tower body 1 through the liquid inlet pipe 2 at the top of the tower body 1, and the gas enters the distillation tower through the gas inlet pipe 31 below the tower body 1, and moves upward along the distillation tower. The liquid first flows into the No. 1 sieve plate 5 along the inner wall of the tower body 1, and part of the liquid flows down through the No. 1 vent hole 51, and the remaining liquid is blocked by the No. 1 baffle 52. The No. 1 baffle 52 makes the liquid collide and disperse during the flow process, which not only increases the mass transfer area of ​​the liquid and the gas, but also increases the mass transfer time of the liquid and the gas. After the liquid overflows several layers of baffles in turn, it continues to flow downward. When passing through the No. 2 sieve plate 6, part of the liquid flows down through the No. 2 vent hole 61, and the remaining liquid collides and disperses with the No. 2 baffle 62 again during the flow. The process of the liquid flowing between the No. 1 sieve plate 5 and the No. 2 sieve plate 6 is S-shaped;

[0035] During the flow of liquid, the liquid passing through is bounced by the first elastic plate 53 arranged between the first sieve plate 5 and the second sieve plate 6, and the second elastic plate 63 between the second sieve plate 6 and the conical metal silo 7. The first elastic plate 53 and the second elastic plate 63 cause the liquid to bounce, and the bounced liquid is dispersed by the shaking of the first elastic strip 54 and the second elastic strip 64 during the downward flow of liquid and the upward flow of gas. The small balls 55 arranged at the ends of the first elastic plate 53 and the second elastic plate 63 cause the shaking of the first elastic strip 54 and the second elastic strip 64 to be more intense, and the liquid is further dispersed.

[0036] The liquid overflows the baffle and continues to flow downward into the conical metal silo 7. The liquid enters the conical metal silo 7 through the through hole 721 on the filler pressure plate 72 and contacts the metal filler 74 in the filler cavity 73. After the liquid enters the filler cavity 73, the impact force of the liquid causes the metal fillers 74 to collide with each other, so that the liquid and the metal filler 74 are fully in contact. During the collision, the liquid is dispersed by the collision. At the same time, as the liquid continues to flow into the conical metal silo 7, the protrusion 731 set in the filler cavity 73 increases the frequency of collision between the metal fillers 74 when the liquid impacts, and the collision between the metal fillers 74 continues.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plate-type packed distillation tower, Features: The tower body (1) comprises a tower body (1), a bottom bracket (11), a liquid inlet pipe (2), a liquid outlet pipe (21), a gas outlet pipe (3), a gas inlet pipe (31), a ventilation plate (4), a liquid passage plate (41), a support rod (42), a first sieve plate (5) and a second sieve plate (6), wherein the tower body (1) is fixedly connected to the bottom bracket (11), the ventilation plate (4) and the liquid passage plate (41) are fixedly connected at the top and bottom of the tower body (1), the ventilation plate (4) and the liquid passage plate (41) are fixedly connected at the middle part, the support rod (42) is fixedly connected at the middle part of the ventilation plate (4) and the liquid passage plate (41), the liquid inlet pipe (2) and the gas outlet pipe (31) are fixedly connected to the bottom of the tower body (1), and the ventilation plate (4) and the liquid passage plate (41) are fixedly connected at the middle part of the ventilation plate (4) and the liquid passage plate (41). 3) fixedly connected to the top of the tower body (1), the liquid outlet pipe (21) and the gas inlet pipe (31) are fixedly connected to the bottom of the tower body (1), a No. 1 sieve plate (5) is welded to the inner wall of the tower body (1), the No. 1 sieve plate (5) is provided with a No. 1 vent hole (51) and a No. 1 baffle plate (52), a No. 2 sieve plate (6) is welded to the support rod (42), the No. 2 sieve plate (6) is provided with a No. 2 vent hole (61) and a No. 2 baffle plate (62), the No. 1 sieve plate (5) and the No. 2 sieve plate (6) are spatially staggered, and the number of the No. 1 baffle plate (52) and the No. 2 baffle plate (62) is more than one; A conical metal silo (7) is provided below the No. 1 sieve plate (5) and the No. 2 sieve plate (6), comprising a packing support plate (71), a packing pressure plate (72), a packing cavity (73) and a metal packing (74); the packing support plate (71) is fixedly connected to the inner wall of the tower body (1) and the support rod (42); a vent hole (711) and a liquid flow hole (712) are provided at the bottom and the side, respectively; the packing cavity (73) is filled with a metal packing; the packing pressure plate (72) is located above the packing support plate (71) and is fixedly connected to the packing support plate (71); and a through hole (721) for liquid flow is provided on the packing pressure plate (72); A protrusion (731) is provided on the support rod (42) in the filling cavity (73); A first elastic plate (53) is provided on the support rod (42) between the first sieve plate (5) and the second sieve plate (6) in the vertical direction, and the first elastic plate (53) is fixedly connected to the support rod (42); a second elastic plate (63) is provided on the inner wall of the tower body (1) between the second sieve plate (6) and the conical metal silo (7) in the vertical direction, and the second elastic plate (63) is fixedly connected to the inner wall of the tower body (1), and the second elastic plate (63) is tilted downward, and the first elastic plate (53) and the second elastic plate (63) have the same structure; The end of the first elastic plate (53) away from the support rod (42) is composed of one or more first elastic strips (54), and the end of the second elastic plate (63) away from the tower body (1) is composed of one or more second elastic strips, and the first elastic strip (54) and the second elastic strip have the same structure; Small balls (55) are fixedly connected at intervals between the ends of the first elastic plate (53) and the second elastic plate (63); After the plate-type packing distillation tower starts working, liquid flows into the tower body (1) along the inner wall of the tower body (1) through the liquid inlet pipe (2) at the top of the tower body (1), and gas enters the distillation tower through the gas inlet pipe (31) below the tower body (1), and moves upward along the distillation tower. The liquid first flows into the first sieve plate (5) along the inner wall of the tower body (1), and part of the liquid flows down through the first vent hole (51), and the rest of the liquid is blocked by the first baffle (52). The first baffle (52) causes the liquid to collide and disperse during the flow process, which not only increases the mass transfer area between the liquid and the gas, but also increases the mass transfer area between the liquid and the gas. , and at the same time, the mass transfer time between the liquid and the gas is increased. After the liquid overflows from several layers of baffles in sequence, it continues to flow downward. When passing through the second sieve plate (6), part of the liquid flows down through the second vent hole (61), and the remaining liquid collides with the second baffle plate (62) again when flowing, thereby further extending the mass transfer time between the liquid and the gas, and further increasing the mass transfer area between the liquid and the gas. The liquid flows between the first sieve plate (5) and the second sieve plate (6) in an S-shaped process, further increasing the gas-liquid contact time, thereby improving the gas-liquid mass transfer efficiency of the plate-type packed distillation tower; As the liquid overflows the baffle and continues to flow downward into the conical metal silo (7), the liquid enters the conical metal silo (7) through the through hole (721) on the packing pressure plate (72) and contacts the metal packing (74) in the packing cavity (73). After the liquid enters the packing cavity (73), the impact force of the liquid causes the metal packings (74) to collide with each other, so that the liquid and the metal packings (74) are fully in contact. During the collision process, the liquid is dispersed by the collision, so that the contact area between the gas and liquid entering the conical metal silo (7) is increased. At the same time, as the liquid continues to flow into the conical metal silo (7), the collision between the metal packings (74) continues, which also increases the time of gas-liquid mass transfer, further improving the efficiency of gas-liquid mass transfer.

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