CN108079752A - A kind of multistage cross flow-adverse current liquid distributor for rotary filling bed and its application - Google Patents

Abstract

The invention discloses a liquid distributor for a multi-stage cross-flow-counter-current rotary packed bed and its application. The device includes an annular sleeve, a liquid collection tank, and a diversion pipe. The annular sleeve includes at least two, and the annular sleeve The tube is composed of two coaxial casings, the annular casing is set on the outside of the rotating shaft, the outer side of the annular casing is the packing rotor, and there are several holes uniformly opened on the outer wall of the annular casing; the liquid collection tank is located at the bottom of the upper annular casing The outer side is connected to the inner wall of the rotating bed shell, and the liquid collection tank communicates with the lower annular casing through the guide tube; the liquid ejected from the upper annular casing is dispersed and merged by the rotating packing rotor for many times, and then collected by the casing It swirls into the liquid collection tank, flows along the draft tube and sprays out from the lower annular casing. The device can collect and evenly distribute liquid, make the mass transfer between gas and liquid more sufficient and strengthen the gas phase mass transfer process; make it possible for the reaction between gas and liquid to undergo multi-stage treatment, and a single device can realize multi-stage reaction and Absorption, with higher efficiency.

Description

A liquid distributor for a multi-stage cross-flow-counter-flow rotary packed bed and its application

technical field

The invention relates to a liquid distributor for a multi-stage cross-flow-counter-flow rotating packed bed and its application, specifically a liquid distributor that can evenly distribute the liquid on the inner edge of each layer of packing in the radial and axial directions, so that the gas-liquid gap A multi-stage cross-flow-counter-current rotating packed bed liquid distributor with more sufficient mass transfer and enhanced gas phase mass transfer process.

Background technique

Hypergravity technology is a technology developed in the 1980s to enhance multiphase transfer and reaction processes, which is mainly achieved by rotating packed beds. This technology is widely used in petroleum, chemical, pharmaceutical, explosives and other industries, mainly in chemical unit operations such as rectification and absorption and the preparation of nanomaterials.

The basic structure of the rotating packed bed includes three parts: liquid distributor, packing and shell. Its working principle is: the liquid enters from the liquid inlet, and the liquid is evenly sprayed on the inner edge of the packing through the liquid distributor. Pass through the filler in the radial direction, contact with the gas in countercurrent, parallel flow or cross flow for mass transfer and reaction, collect from the shell and discharge from the liquid outlet.

In the rotating packed bed, the gas is the continuous phase, and the liquid is the dispersed phase, so whether the liquid can be evenly distributed in the packing will directly affect the mass transfer effect of the rotating packed bed. The fillers used in the rotating packed bed are usually corrugated wire mesh, mesh metal, metal foam, Raschig rings and other fillers, which provide a place for gas-liquid contact, but cannot solve the problem of uniform distribution of liquid, and for some reactions Generally speaking, the gas-liquid contact is not sufficient, the contact time is short, the gas-liquid mass transfer effect is not high, and the purification degree is poor, resulting in the need for multiple equipment to achieve high-precision purification. The multi-stage rotating packed bed came into being, among which the liquid distributor is the core part, and the quality of the structure directly affects the uniformity of liquid distribution, liquid consumption and mass transfer effect.

In the rotating packed bed, the liquid distributor is generally a tubular structure on the liquid inlet pipe in the center of the equipment cavity, and there are stationary and rotating ones. The static distributor has the following advantages: the ejected liquid and the filler undergo relatively large relative motion and initial collision and redispersion, and the circumferential direction can be uniformly distributed at different axial heights on the inner edge of the filler.

Contents of the invention

The present invention aims to provide a liquid distributor for a multi-stage cross-flow-counter-current rotary packed bed and its application, which can enable multiple collection and uniform distribution of liquid, make the mass transfer between gas and liquid more sufficient and strengthen the gas phase mass transfer process ; After the reaction between gas and liquid undergoes multi-stage contact reaction and absorption, the gas has a higher removal rate and purification degree, the liquid has a higher concentration, the energy saving effect is remarkable, and it is more in line with efficient purification and high-precision removal of harmful substances. new requirements for environmental protection.

The invention provides a multi-stage cross-flow-counter-flow rotating packed bed liquid distributor, comprising an annular sleeve, a liquid collection tank, and a flow guide pipe, the annular sleeve includes at least two, and the annular sleeve is composed of two coaxial The casing is composed of a casing, the annular casing is set on the outside of the rotating shaft, and the outer side of the annular casing is a packing rotor. There are a number of holes or grids evenly opened on the outer wall of the annular casing; the liquid collection tank is located outside the bottom of the upper annular casing, and The inner walls of the rotating bed shells are connected, and the liquid collecting tank communicates with the lower annular sleeve through the guide tube; the liquid sprayed from the upper annular sleeve enters the liquid collecting tank, and is sprayed out from the lower annular sleeve along the flow guide tube.

The annular sleeves are all placed between the rotating shaft and the filler. The annular sleeves pass through the filler stator and are fixed with the filler stator by welding to prevent gas short circuit. There are holes through which liquid is ejected through the packing into the sump.

The holes are circular holes or grids. The number of holes is determined by the liquid flow and velocity, and the liquid velocity is controlled at 0.5-6m/s.

The liquid collecting tank is circular, and its cross section is a U-shaped groove composed of an annular thin plate, an inner cylinder, and the inner wall of the rotating bed shell. The liquid collecting tank is located inside the rotating bed shell, and the annular thin plate is perpendicular to the inner wall of the shell. And it is welded on the inner wall of the shell to collect liquid; the inner cylinder is concentric with the shell, and the bottom of the inner cylinder is welded with the annular thin plate as a whole.

The guide tube is a circular tube, located at the lower part of the liquid collection tank, and the lower end of the guide tube is connected to the liquid distributor on the next layer; the diameter of the circular tube is determined by the liquid flow rate, and the flow rate is controlled at 0.01-1m /s. The diversion pipes are arranged under the liquid collection tank, and there are 2 to 8 uniformly arranged, which are evenly arranged obliquely downwards toward the center of the circle along the circumference of the liquid collection tank, and several guide pipes form a tapered structure.

The guide pipe is connected with the sump and the next liquid distributor by welding. to prevent liquid spillage.

The height of the inner cylinder is determined by the liquid flow rate, and the amount of collected liquid cannot exceed the height of the cylinder.

The core component distributor of the present invention is two coaxial annular sleeves. After the liquid enters the rotating packing bed from the liquid inlet, it is evenly sprayed on the inner edge of the packing rotor. Under the action of centrifugal force, it is thrown out radially to the surroundings. The flow tube enters the liquid distributor of the lower layer, and after a certain amount of liquid is collected, the liquid is sprayed on the inner edge of the filler rotor of the next layer by the round hole or grid of the liquid distributor, and is thrown out radially to the surroundings under the action of centrifugal force. Collected by the outer wall, it enters the sump or discharges from the liquid outlet.

Beneficial effects of the present invention:

(1) The structural design of the present invention standardizes the flow path of the liquid in the liquid distributor, forms good multiple collection and redistribution, and makes the mass transfer between gas and liquid more sufficient;

(2) In addition, each stage of gas-liquid is in cross-flow contact, and the processing capacity is large. On the whole, it is counter-current, and the mass transfer effect is good.

(3) The structure is simple, the liquid processing capacity is large, and it is used in a multi-stage cross-flow-counter-flow supergravity device; it is suitable for popularization and application in the efficient purification of gases in petrochemical, coal chemical and other industries and the removal of harmful substances with high precision.

Description of drawings

Figure 1 is a schematic diagram of the structure of a liquid distributor.

Fig. 2 is a sectional view along line A-A in Fig. 1 .

Fig. 3 is a sectional view along line B-B in Fig. 1 .

Fig. 4 is a sectional view along line C-C in Fig. 1 .

In the figure: 1-gas inlet; 2-packing rotor; 3-lower liquid distributor; 4-drainage pipe; 5-collection tank; 6-inner cylinder; 7-upper liquid distributor; 8-gas outlet; 9-liquid inlet; 10-liquid outlet; 11-ring sleeve.

Detailed ways

The present invention is further illustrated by the following examples, but not limited to the following examples.

Example 1:

As shown in Figures 1 to 4, a multi-stage cross-flow-counter-current rotary packed bed liquid distributor includes an annular sleeve 11, a liquid collection tank 5, and a flow guide pipe 4, and the annular sleeve 11 includes at least two, the The annular sleeve 11 is composed of two coaxial sleeves. The annular sleeve 11 is set on the outside of the rotating shaft. The outer side of the annular sleeve is the packing rotor 2. There are several holes or grids uniformly opened on the outer wall of the annular sleeve; The groove 5 is located outside the bottom of the upper annular sleeve 7 and connected to the inner wall of the rotating bed shell;

In this embodiment, there are two annular sleeves, namely, the upper liquid distributor 7 and the lower liquid distributor 3; The liquid passes through the packing and enters the liquid collection tank, flows along the guide tube and sprays out from the lower floor liquid distributor 3.

The annular sleeves 11 are all placed between the rotating shaft and the filler rotor 2, the annular sleeves pass through the filler stator and are fixed with the filler stator by welding to prevent short-circuiting of the gas. The hole along which the liquid is ejected through the packing and into the sump.

The holes are circular holes or grid holes. The number of holes is determined by the liquid flow and velocity, and the liquid velocity is 0.3-6m/s.

The liquid collection tank 5 is circular, and its cross section is: a U-shaped groove composed of an annular thin plate, an inner cylinder 6, and the inner wall of the rotary bed shell. The liquid collection tank 5 is located inside the rotary bed shell, and the annular thin plate is vertical It is installed on the inner wall of the housing by welding to collect liquid and distribute it in the draft tube; the inner cylinder 6 is a cylinder concentric with the housing, and the bottom of the inner cylinder is welded with the annular thin plate as a whole.

The guide pipe 4 is a round pipe, the diameter of which is determined by the liquid flow rate and flow rate, and the flow rate is controlled at 0.01-1m/s; its bottom is connected with the lower liquid distributor.

There are 2-8 guide tubes 4, which are evenly arranged obliquely downward along the circumferential direction, and several guide tubes form a tapered structure. As shown in Figure 3, this embodiment is provided with three guide tubes, the guide tubes connect the liquid collection tank with the next layer of liquid distributor, and the guide tubes are evenly arranged obliquely downward toward the center of the circle along the circumference of the liquid collection tank , and the distance between any two diversion tubes is equal, and the included angle is 120°.

The guide pipe 4 is connected with the sump and the next liquid distributor by welding. to prevent liquid spillage.

The height of the inner cylinder 6 is determined by the liquid flow rate, and the amount of collected liquid cannot exceed the height of the cylinder.

The core component distributor of the present invention is two coaxial annular sleeves. The liquid enters the rotating packing bed from the liquid inlet 9 and evenly sprays on the inner edge of the packing layer. The diversion tube enters the liquid distributor of the lower layer, and after a certain amount of liquid is collected, the liquid is sprayed on the inner edge of the next layer of filler rotor through the circular hole of the liquid distributor, and is thrown out radially to the surroundings under the action of centrifugal force, and is discharged by the outer wall. Collected and discharged from the liquid outlet 10. At the same time, the gas enters the packed bed from the gas inlet 1 at the bottom of the rotating packed bed, the liquid flows from the inside to the outside in the radial direction, and the gas flows from the bottom to the top in the axial direction, and each stage of gas-liquid intersection is a cross-flow contact , the processing capacity is large, on the whole it is countercurrent contact, the mass transfer effect is better, and the purification degree is higher.

Claims (9)

1. A liquid distributor for a multistage cross-flow-counter-current rotary packed bed, characterized in that: it comprises an annular sleeve, a liquid sump, and a draft tube, and the annular sleeve comprises at least two, and the annular sleeve is composed of two Composed of two coaxial sleeves, the annular sleeve is placed outside the rotating shaft, the outer side of the annular sleeve is the packing rotor, and there are a number of holes evenly opened on the outer wall of the annular sleeve; the liquid collection tank is located outside the bottom of the upper annular sleeve, The inner wall of the rotary bed shell is connected, and the liquid collection tank communicates with the lower annular casing through the guide tube; the liquid ejected from the upper annular casing is dispersed and merged by the rotating packing rotor for many times, and then is collected by the casing and swirls into the collection. In the liquid tank, it flows out along the flow guide tube to the lower annular casing. 2. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the annular sleeves are all placed between the rotating shaft and the packing rotor, and the annular sleeves pass through the packing stator It is fixed with the filler stator by welding to prevent gas short circuit. There are a number of holes evenly opened on the outer wall of the annular casing, and the liquid is sprayed out along the holes and passes through the filler rotor and enters the liquid collection tank. 3. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the holes are circular holes or grid holes; the number of holes is determined by the liquid flow and velocity. 4. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the described sump is circular, and its section is composed of annular thin plate, inner cylinder, rotating The U-shaped groove formed by the inner wall of the bed shell, the liquid collecting tank is located inside the rotating bed shell, and the annular thin plate is perpendicular to the inner wall of the shell and welded to the inner wall of the shell for collecting liquid; the inner cylinder is concentric with the shell The cylinder, the bottom of the inner cylinder is welded together with the annular thin plate. 5. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the guide tube is a circular tube, located at the bottom of the sump, the lower end of the guide tube is connected to the The liquid distributor on the next layer is connected; the diameter of the circular pipe is determined by the liquid flow rate, and the flow rate is controlled at 0.01-1m/s. 6. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the guide pipe is arranged under the liquid collection tank, and there are 2 to 8 uniformly arranged, along the collection tank. The circumferential direction of the liquid tank is uniformly arranged obliquely downward toward the center of the circle, and several guide pipes form a tapered structure. 7. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the guide pipe is connected with the liquid collection tank and the next liquid distributor by welding. 8. The liquid distributor for multi-stage cross-flow-counter-current rotating packed bed according to claim 1, characterized in that: the height of the inner cylinder is determined by the liquid flow rate, and the amount of collected liquid cannot exceed the height of the cylinder . 9. The application of the multi-stage cross-flow-counter-current rotary packed bed liquid distributor described in any one of claims 1 to 8, characterized in that: the liquid enters the rotary packed bed from the liquid inlet at the top of the rotary packed bed evenly Sprayed on the inner edge of the packing layer, under the action of centrifugal force, it is thrown out radially to the surroundings, collected by the outer wall of the rotating packing bed and flows down along the wall, swirling into the liquid collection tank, and under the action of gravity, the liquid enters the lower layer along the guide pipe for distribution After collecting a certain amount of liquid, the liquid is sprayed on the inner edge of the next layer of packing by the round hole or grid of the liquid distributor. The liquid outlet at the bottom of the bed is discharged; at the same time, the gas enters the packed bed from the gas inlet at the bottom of the rotating packed bed, forming a multi-stage cross-current-counter-current contact with the liquid.