CN110339675B - Method and device for removing isopropanol gas - Google Patents
Method and device for removing isopropanol gas Download PDFInfo
- Publication number
- CN110339675B CN110339675B CN201910541562.XA CN201910541562A CN110339675B CN 110339675 B CN110339675 B CN 110339675B CN 201910541562 A CN201910541562 A CN 201910541562A CN 110339675 B CN110339675 B CN 110339675B
- Authority
- CN
- China
- Prior art keywords
- liquid
- gas
- packing
- absorption
- rotating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/1487—Removing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/202—Alcohols or their derivatives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a method and a device for removing isopropanol gas. The device comprises an embedded rotary packed bed, a rotary demister, an annular liquid distributor, a redistributor, a packed rotor, a stator and a shell; the packing rotor is regular packing for 3D printing. An isopropanol gas is introduced into a gas inlet pipe on the side surface of a shell of the embedded rotary packing bed, an absorption liquid is introduced into a liquid inlet pipe, a top exhaust pipe is connected with a purified gas working section, and a liquid discharge pipe at the bottom is used for discharging the absorption liquid; isopropanol gas and absorption liquid are in countercurrent contact in an inlaid rotary packed bed of a regular packing for 3D printing, and the isopropanol gas and the absorption liquid are dispersed, aggregated and redispersed for multiple times under the shearing action of the regular packing for 3D printing rotating at high speed, so that multiple purification of a single device is realized. The device increases the gas phase turbulence degree, reduces the gas phase pressure drop, improves the effective gas-liquid contact area and the interface updating rate, improves the purification degree of the isopropanol gas, and improves the concentration of the isopropanol in the absorption rich solution and the utilization rate of the absorption solution.
Description
Technical Field
The invention relates to a method and a device for removing isopropanol gas, belonging to the field of isopropanol removal.
Background
Isopropyl alcohol is the first chemical product prepared from petroleum raw materials in the development history of petrochemical industry, is an important chemical product and raw material, and is widely applied to industries such as coatings, medicines, pesticides, cosmetics, electronic production and the like. But because the saturated vapor pressure is lower, the isopropanol belongs to volatile organic compounds, and a large amount of volatilized isopropanol gas in the production process causes serious environmental pollution and great resource waste.
The tower equipment is one of the most important equipment in the chemical production process, and the performance of the tower component has great influence on the energy consumption/yield of the process, the quality of products and the like. At present, a large number of various packed towers, plate towers and the like are industrially used in an isopropanol absorption section, the gas-liquid mass transfer process in the equipment is realized only by the action of gravity, and because a gravitational field is weaker, liquid phase fluid flows in a tower equipment in a thicker fluid layer, and the effective gas-liquid contact area is smaller, the separation requirements can be met only by low mass transfer performance, low absorption rate, large absorption liquid circulation amount, a plurality of absorption towers with the height of tens of meters and the like, and the production cost, the maintenance cost and the energy consumption of enterprises are increased more and more.
The isopropanol absorption liquid absorbs the isopropanol, which belongs to a gas film control system. Therefore, in the design of mass transfer equipment and the development of fillers, the turbulence degree of a gas phase should be improved, the effective contact area of the gas and the liquid should be increased, and the like, so as to achieve the purposes of strengthening the mass transfer of the gas phase and improving the absorption rate.
The supergravity rotating packed bed is one new type of chemical process reinforcing equipment. On earth, a hypergravity environment can be realized by centrifugal force generated by rotation. In the hypergravity environment, the molecular diffusion and interphase mass transfer processes among molecules with different sizes are much faster than those in the conventional gravity field, gas-liquid two phases generate violent flowing contact in a porous medium or a pore channel in the hypergravity environment which is hundreds of times or even thousands of times larger than the earth gravity field, the liquid is torn into tiny liquid films, liquid threads and liquid drops by huge shearing force, huge interphase contact area is generated, the quick update of a phase interface can be realized, and the transfer rate coefficient is greatly improved. Therefore, the hypergravity rotating packed bed as the equipment for removing the isopropanol can greatly improve the purification rate, reduce the circulation amount of the absorption liquid, reduce the production and construction cost and the occupied area, and further reduce the cost and the energy consumption for removing the isopropanol.
The fillers adopted in the rotary packed bed are usually corrugated wire mesh, reticular metal, metal foam, raschig rings and the like, although a place is provided for gas-liquid contact, the problem of uniform distribution of gas and liquid phases cannot be effectively solved, and for some reactions, the defects of insufficient gas-liquid contact, short contact time, large resistance pressure drop and the like exist, so that the mass transfer effect is not ideal and the energy consumption is overhigh. Therefore, the quality of the fine structure of the filler directly influences the improvement of the mass transfer efficiency and the energy consumption of the process.
Disclosure of Invention
The invention aims to provide a method and a device for removing isopropanol gas, which take a mosaic type rotating packed bed of 3D printed regular packing as absorption equipment, an isopropanol aqueous solution as absorption liquid, remove the isopropanol gas by a physical absorption method, and contact and absorb an absorbent and the isopropanol gas in a countercurrent mode in the mosaic type rotating packed bed of the 3D printed regular packing, so that the isopropanol gas is deeply removed, and a high-concentration rich liquid is obtained.
The embedded type rotary packing bed for the 3D printing structured packing is designed based on the idea of strengthening gas phase shearing, enhancing airflow disturbance, increasing the relative slip speed between gas and packing, increasing the effective contact area of gas and liquid, wherein two layers of 3D printing structured packing rings are respectively arranged on an upper packing disc and a lower packing disc of the embedded type rotary packing bed, the layers are static and dynamic and are alternately arranged in the radial direction, the lower packing discs synchronously rotate along with a motor to generate a supergravity field of gas-liquid contact, and the upper packing discs are static and static. When liquid is sprayed to the inner edge of the lower packing disc, the liquid is subjected to huge centrifugal force, and is cut into tiny liquid drops by the packing rotating at high speed, the liquid drops also have certain tangential speed at the moment, the probability of collision with the next layer of silk screen is very high, in the process, the liquid can collide with each other and be converged and then cut by other silk screen layers, the liquid can also directly collide with other layers of silk screens, the liquid can also collide and atomize with the silk screen layers after being splashed back, the process is repeated continuously, the liquid is torn into an extremely thin liquid drop liquid silk liquid film, and the gas-liquid contact area is increased. Meanwhile, after the gas passes through the last packing ring rotating at a high speed, the gas has a radial movement trend and a circumferential movement trend which is the same as the rotation direction of the rotor by means of inertia, and when the gas passes through the fin structure of the next packing ring from outside to inside along the radial direction, the gas is retarded by the fin structure, the relative slip speed between the gas and the packing is increased, the circumferential movement trend of the gas is weakened, the disturbance and the shearing action on the gas are further increased, the gas film resistance is reduced, and the gas phase mass transfer is strengthened. The purified isopropanol gas enters a purified gas section from an air outlet after mist entrainment in the gas is eliminated by the rotary demister, and absorption liquid after absorption is collected and gathered in a shell of the rotary packed bed and is discharged from a liquid outlet.
The invention provides a method for removing isopropanol gas, which comprises the following steps:
the isopropanol gas and the absorption liquid are in countercurrent contact through an embedded type rotating packed bed of the 3D printing structured packing, and the removal of the isopropanol gas is completed under the shearing action of the 3D printing structured packing rotating at a high speed; the control parameters are as follows:
the liquid-gas volume flow ratio is as follows: 100 to 200;
the rotation speed of the rotor of the embedded rotary packed bed is as follows: 100 to 1800 r/min;
the absorption liquid is: an aqueous isopropanol solution;
the absorption pressure is: 0.1 to 2 MPa;
the absorption temperature was: 20 to 100 ℃;
the specific process of the method is as follows: absorption liquid enters the annular liquid distributor from the liquid inlet pipe, is uniformly sprayed on the inner edge of the lower packing disc of the 3D printing structured packing rotating at a high speed, moves from the inner edge of the packing to the outer edge of the packing along the radial direction, and is sheared into liquid filaments, liquid drops and a liquid film by the passive, static and alternate 3D printing structured packing ring;
simultaneously, isopropanol gas is introduced into the gas inlet pipe, the gas is uniformly distributed on the static packing ring at the outer edge of the upper packing disc, moves towards the lower packing ring which rotates at a high speed and is adjacent to the inner edge, and is sheared by the lower packing ring rotating at the high speed, and then passes through the fin structure at the outer side of the static packing ring again, the gas is eliminated or weakened along the radial rotating trend and the circumferential moving trend which is the same as the rotating direction of the rotor by means of inertia, the gas turbulence degree is increased, finally, the redistributed gas continues to move towards the inner edge and is sheared at the high speed by the lower packing ring rotating at the high speed again, the gas is sheared by the packing rings at intervals, the mass transfer resistance of a gas film is effectively reduced, the gas phase turbulence degree is increased, and the gas and the liquid are in countercurrent contact with each other as a whole; and finally, mist in the gas is eliminated by the rotary demister and then is discharged from the gas outlet, and the absorption liquid which finishes the absorption process is collected and gathered in the shell of the rotary packed bed and is discharged from the liquid outlet, so that the function of multiple absorption and purification of a single device is realized, and the concentration of the absorption rich liquid is improved.
The invention provides a device for removing isopropanol gas, which comprises an embedded rotary packed bed for 3D printing regular packing, wherein the side surface of a shell of the embedded rotary packed bed is provided with an air inlet pipe and a liquid inlet pipe, the isopropanol gas and absorption liquid are respectively introduced, the top of the shell is provided with a gas outlet and is connected with a purified gas working section, the bottom of the shell is provided with a liquid outlet for discharging the absorption liquid, the liquid inlet is connected with a pump, and the liquid outlet is connected with a liquid enrichment tank;
the embedded rotary packed bed for the 3D printing structured packing comprises a rotary demister, a rotary packed bed shell, 3D printing structured packing, an annular liquid distributor and redistributor, a rotating shaft and a packing rotor, wherein the packing rotor consists of an immovable upper packing disc and an independently rotating lower packing disc;
in the device, the interior of the housing of the embedded rotary packed bed is roughly divided into two communicating spaces, and a gas collecting chamber is arranged above the packed rotor and on the inner side of the cylinder and communicated with the rotary demister; a main chamber is arranged below the filler rotor and communicated with a liquid outlet; the pivot is solid axle, and the pivot sets up in the center of casing, and the upper end links to each other with rotatory defroster, and the lower extreme links to each other with frequency modulation motor, and the centre links to each other with lower packing tray, drives rotatory defroster and lower packing tray high-speed rotation through the motor.
In the device, the liquid inlet pipes are positioned at two sides of the shell of the embedded rotary packed bed and connected with the annular liquid distributor, so that liquid can be fed from two sides simultaneously or in a single direction.
In the device, the rotating demister is positioned at the upper part of the rotating packed bed, the bottom of the rotating packed bed is connected with the liquid collecting tank, and the rotating demister is connected with the rotating shaft and is driven by the motor to rotate; the type and material of the filler in the rotating demister are not limited.
In the device, the annular liquid distributor comprises an annular pipe and branch pipes, wherein the annular pipe is connected with the liquid inlet pipe, the branch pipes are vertical to the annular pipe and uniformly arranged along the annular pipe by 2-6 pipes, the branch pipes extend into the inner side of the center of the packing rotor in the direction, the packing rotor is arranged outside the annular pipe and the branch pipes, and a plurality of holes are uniformly formed in the pipe wall of each branch pipe;
the holes are circular holes or grid holes; the number of holes is determined by the liquid flow rate and flow rate.
In the device, the redistributor comprises a liquid collecting tank and a flow guide pipe, wherein the liquid collecting tank is positioned at the bottom of the rotary demister and is connected with the inner wall of a shell of the rotary bed, and the liquid collecting tank is connected with the inner side of the fixed upper packing disc through the flow guide pipe; liquid thrown out from the demister is collected by the shell, flows into the liquid collecting tank and flows to the center of the filler rotor along the flow guide pipe; furthermore, the liquid collecting tank is in a circular ring shape, the cross section of the liquid collecting tank is a U-shaped groove consisting of an annular thin plate, an inner cylinder and the inner wall of the shell of the rotating bed, the liquid collecting tank is positioned at the inner side of the shell of the rotating bed, and the annular thin plate is perpendicular to the inner wall of the shell, welded on the inner wall of the shell and used for collecting liquid in the demister; the inner cylinder is concentric with the shell and is welded with the annular thin plate into a whole; the height of the inner cylinder is determined by the flow of the absorption liquid, and the amount of liquid collected cannot exceed the height of the cylinder. Furthermore, the flow guide pipes are round pipes, are arranged below the liquid collecting tank, are uniformly arranged in 2-8 numbers, are uniformly and obliquely downwards arranged along the circumferential direction of the liquid collecting tank towards the direction of the circle center and are connected with the inner side of the upper packing disc; the diameter of the draft tube is determined by the flow velocity of the absorption liquid, and the flow velocity of the absorption liquid is controlled to be 0.01-2 m/s.
In the device, the upper and lower packing discs are respectively provided with a plurality of circles of grooves, 3D printing structured packing is arranged in the grooves and is fixed with the packing discs through bolts, and gas short circuit is prevented; two layers of regular packing rings are respectively arranged on the inner radial outer diameter and the outer radial outer diameter, wherein the regular packing rings are static, dynamic and alternate, the rings are buckled, and a gap is reserved between every two adjacent rings.
In the device, the 3D printing structured packing consists of a structured wire mesh structure and a fin structure; the packing is annular, mainly adopts a regular wire mesh structure, and is provided with a fin structure on the outer side. The three-dimensional structure of the regular wire mesh structure is as follows: the wire mesh with tangent rings of a plurality of layers is arranged along the radial direction, each layer of wire mesh is a circular ring enclosed by a plurality of cubes, the face diagonal lines and the body diagonal lines of the cubes are connected with each other to form a triangle in a three-dimensional space, and the regular gas-liquid channel improves the utilization rate of the filler, promotes the gas-liquid to be uniformly dispersed, and reduces the resistance; in order to ensure uniform gas-liquid circulation channels, the adjacent silk screen layers are staggered by 15-45 degrees, so that the collision probability of liquid and filler is increased; the fin structure has the spatial configuration that: the arc pieces formed by bending the silk screen or the plate are assembled at the outer edge of the silk screen structure and are shaped like fan blade structures, and the bending direction of the arc pieces is opposite to the rotating direction of the rotor.
Further, the thickness of the regular wire mesh structure along the radial direction is 20-50 mm; two holes are symmetrically formed along the central axis of the screen structure, so that the screen structure is conveniently fixed with a packing disc by bolts, and the aperture is 2-3 mm.
Furthermore, the unit arc sheets of the fin structure are formed by bending a silk screen or a sheet at 10-50 degrees, the arc length is 30-80 mm, the distance between every two adjacent arc sheets is 10-40 mm, and the radial thickness is 5-20 mm.
The innovation of the invention is mainly represented by: (1) the innovation of the device is as follows: the advantages of designing an embedded rotary packed bed are as follows: the method has the advantages that firstly, high shearing and disturbance are simultaneously realized on liquid and gas, the gas-liquid mass transfer process is further strengthened, particularly for the mass transfer process controlled by a gas film, the method has the characteristics of less filler, low spraying density and the like, and the circulating flow and energy consumption of absorption liquid can be reduced; secondly, the device has smaller volume, less investment, convenient and flexible start and stop, low maintenance cost and the like.
(2) The innovation of the filler is as follows: aiming at the problems that the traditional filler has no obvious strengthening effect on the mass transfer process of a gas film control system, the filler is non-geometrically symmetric and has poor dynamic balance, a large number of irregular channels and blind channels exist, the filler utilization rate is high, the filler is easy to block, the filler is not easy to maintain and replace, and the like, the structured and staggered gas-liquid phase channel is constructed by adopting the 3D printing structured filler, the turbulence degree and the sufficient dispersion of a gas phase and a liquid phase are increased, the gas and the liquid are fully contacted, the gas and the liquid can be further sheared and disturbed at high speed by utilizing the embedded filler layer, the gas film mass transfer resistance is effectively reduced, the gas-liquid mass transfer process is strengthened, the absorption rate is improved, the filler utilization rate can be improved without blind channels, and the gas phase pressure drop is reduced.
(3) The innovation of the process is as follows: the hypergravity technology is applied to the traditional isopropanol gas purification section, the problems of low isopropanol gas absorption rate, insufficient pregnant solution concentration and the like are solved, the removal rate of the isopropanol gas is improved, the concentration of the isopropanol in the treated gas is reduced, the problems that the subsequent treatment of the isopropanol gas is difficult and the like are solved, and the hypergravity technology has strong engineering practical application significance and energy-saving and environment-friendly significance.
The invention has the beneficial effects that:
(1) The invention adopts an embedded rotary packed bed as an isopropanol removing device and uses isopropanol aqueous solution as an absorbent. The isopropanol aqueous solution is a nontoxic, tasteless and environment-friendly solution, has good chemical stability and thermal stability, does not react under the use condition, and has the advantages that the solubility of the isopropanol in the aqueous solution obeys Henry's law at the working condition temperature and is reduced along with the increase of pressure and temperature;
(2) The packing is regularly printed by 3D, is circumferentially symmetrical overall, has consistent density, light weight, good dynamic balance performance, short manufacturing period and easy replacement, has uniformly distributed gas-liquid phase channels, and is favorable for improving gas-liquid phase distribution and reducing gas-phase pressure drop; the composite material has larger effective specific surface area and extremely high filler utilization rate, can provide extremely large gas-liquid contact area and interface update rate, and greatly improves mass transfer efficiency and absorption rate;
(3) The isopropanol absorption by isopropanol water solution belongs to the gas film control system. An embedded rotary packed bed with 3D printing regular packing is used as a receiving-only device, so that the mass transfer coefficient of a gas film is improved, the effective contact area of a gas phase and a liquid phase is increased, and the gas phase and the liquid phase are quickly and fully mixed; the circulation volume of the absorption liquid is greatly reduced, and the volume of the equipment is greatly reduced, so that the investment and the operation cost are reduced;
(4) The invention can strengthen the gas film control process and is suitable for treating volatile organic gases such as alcohols and the like and toxic and harmful malodorous gases and the like;
(5) The process has the advantages of simple flow, small occupied area, less circulating liquid amount, less equipment investment, low operation cost and high treatment efficiency; the start and stop of the process are convenient, the whole process flow can be stably operated in only a few minutes, and the industrial application is easy to realize.
Drawings
FIG. 1 is a schematic structural view of a mosaic rotary packed bed;
FIG. 2 is a top view of a 3D printed structured packing;
FIG. 3 is a schematic view of a unit arc of fin structure;
FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 6 is a schematic flow diagram of a process for the absorption of isopropanol gas according to the present invention;
FIG. 7 is a top view of an annular liquid distributor;
fig. 8 is a top view of a liquid redistributor.
In the figure: 1-a frequency modulation motor; 2-a rotating shaft; 3-a liquid discharge port; 4-a shell; 5, air inlet pipe; 6-liquid inlet pipe; 7-a cylinder; 8-a flow guide pipe; 9-a liquid collecting tank; 10-a rotating demister; 11-gas outlet; 12-inner cylinder; 13-an annular liquid distributor; 14-a gas collection chamber; 15-a shunt tube; 16-upper packing pan; 17-3D printing structured packing; 18-lower packing cup; 19-a main chamber; 20-a lean liquor tank; 21-a water pump; 22-a flow meter; 23-a blower; 24-a pregnant solution tank; 25-embedded rotating packed bed; 26-bolt holes; 27-regular wire mesh structure; 28-fin structure; a-isopropanol-containing tail gas.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
As shown in figures 1-8, a device for removing isopropanol gas comprises an embedded rotary packed bed 25 for 3D printing of novel structured packing, wherein an air inlet pipe 5 and a liquid inlet pipe 6 are arranged on the side surface of a shell 4 of the embedded rotary packed bed, isopropanol gas and absorption liquid are introduced, a gas outlet 11 is arranged at the top of the shell and connected with a purified gas workshop section, a liquid outlet 3 is arranged at the bottom of the shell and used for discharging the absorption liquid, the liquid inlet pipe 6 is connected with a water pump 21, and the liquid outlet 3 is connected with a liquid enrichment tank 24.
3D prints novel regular embedded rotatory packed bed of packing and includes rotatory defroster 10, rotatory packed bed casing 4, 3D prints regular packing 17, annular liquid distributor 13 and redistributor, pivot 2 and filler rotor, filler rotor comprises immovable last gland 16 and independent rotatory lower gland 18, it is fixed with the upper cover plate of rotatory packed bed casing with drum 7 to go up 16 tops of gland, lower gland 18 is connected with pivot 2, frequency modulation motor 1 is connected to the pivot lower extreme, the filler rotor center is equipped with annular liquid distributor 13, annular liquid distributor side links to each other with feed liquor pipe 6.
In the device, the inner part of the embedded rotary packed bed shell is roughly divided into two communicated spaces, and an air collecting chamber 14 is arranged above the packed rotor and on the inner side of the cylinder and communicated with the rotary demister; a main chamber 19 is arranged below the filler rotor and communicated with a liquid discharge pipe; the rotating shaft 2 is a solid shaft, the rotating shaft is arranged at the center of the shell, the upper end of the rotating shaft is connected with the rotating demister 10, the lower end of the rotating shaft is connected with the frequency modulation motor 1, the middle of the rotating shaft is connected with the lower packing disc 18, and the rotating demister and the lower packing disc are driven to rotate at a high speed through the motor.
In the device, the liquid inlet pipes 6 are positioned at two sides of the shell of the embedded rotary packed bed and are connected with the annular liquid distributor;
two liquid inlet pipes are arranged in the liquid inlet pipe, so that liquid can be fed from two sides simultaneously, and liquid can be fed in one direction.
In the device, the rotary demister 10 is positioned at the upper part of the rotary packed bed, the bottom of the rotary packed bed is connected with the liquid collecting tank 9, and the rotary demister 10 is connected with the rotating shaft 2 and is driven to rotate by the frequency modulation motor 1; random packing or regular packing is arranged in the rotating demister 10, and the type and material of the packing are not limited.
In the device, the annular liquid distributor comprises an annular pipe 13 and branch pipes 15, the annular pipe is connected with the liquid inlet pipe, the branch pipes are vertical to the annular pipe and uniformly arranged with 2 pipes along the annular pipe, the branch pipes extend into the inner side of the center of the packing rotor in the direction, the outer sides of the annular pipe and the branch pipes are provided with the packing rotor, and the pipe wall of each branch pipe is uniformly provided with a plurality of holes; the holes are circular holes or grid holes; the number of holes is determined by the liquid flow rate and flow rate.
The redistributor comprises a liquid collecting tank 9 and a flow guide pipe 8, wherein the liquid collecting tank is positioned at the lower part of the rotary demister 10 and is connected with the inner wall of the rotary bed shell 4, and the liquid collecting tank is connected with the inner side of the fixed upper packing pan 16 through the flow guide pipe; liquid thrown out by the rotational flow in the demister is collected by the shell, flows into the liquid collecting tank 9 and flows to the center of the filler rotor along the flow guide pipe 8;
furthermore, the liquid collecting tank 9 is a circular ring, the section of the liquid collecting tank is a U-shaped groove consisting of a circular thin plate, an inner cylinder 12 and the inner wall of the rotating bed shell 4, and the liquid collecting tank is positioned at the inner side of the rotating bed shell, is perpendicular to the inner wall of the shell, is welded on the inner wall of the shell and is used for collecting liquid carried by mist in the demister; the inner cylinder 12 is a cylinder concentric with the shell and is welded with the annular thin plate into a whole.
In the above device, the height of the inner cylinder is determined by the flow rate of the absorption liquid, and the amount of the collected liquid cannot exceed the height of the cylinder.
In the device, the draft tube 8 is a circular tube, the diameter of the draft tube is determined by the flow velocity of the absorption liquid, the flow velocity is controlled to be 0.01-2 m/s, and the draft tube is arranged below the liquid collecting tank; in the embodiment, 3 flow guide pipes are uniformly arranged, are uniformly and obliquely arranged downwards along the circumferential direction of the liquid collecting tank towards the direction of the circle center and are connected with the inner side of the upper packing disc 16;
in the device, a plurality of circles of grooves are respectively formed in the upper packing disc and the lower packing disc, 3D printing structured packing is placed in the grooves 17 and is fixed with the packing discs through bolts, and gas short circuit is prevented; two layers of regular packing rings are respectively arranged on the inner radial outer diameter and the outer radial outer diameter, one layer of regular packing rings is static, the other layer of regular packing rings is dynamic, the regular packing rings are alternately arranged, the ring rings are buckled, and a gap is reserved between every two adjacent rings.
In the device, the novel 3D printing structured packing consists of a structured wire mesh structure and a fin structure; the filler is annular, and is mainly of a regular wire mesh structure, and a fin structure is arranged on the outer side of the filler.
The three-dimensional structure of the regular wire mesh structure is as follows: the silk screens tangent to the ring rings are arranged along the radial direction, each layer of silk screen is a circular ring formed by enclosing a plurality of cubes, the face diagonal lines and the body diagonal lines of the cubes are connected with each other to form a triangle in a three-dimensional space, the stability of the triangle is fully utilized, and the utilization rate of the filler is improved by the regular gas-liquid circulation channel; in order to ensure uniform gas-liquid circulation channels, the adjacent silk screen layers are staggered by 15-45 degrees, and the collision probability of liquid and filler is increased.
In the above device, the fin structure has a three-dimensional configuration: the unit arc pieces formed by bending the silk screen or the plate are assembled at the outer edge of the silk screen structure and are shaped like fan blade structures, and the bending direction of the unit arc pieces is opposite to the rotating direction of the rotor.
In the above device, the thickness of the regular wire mesh structure in the radial direction is 20 to 50 mm. Two bolt holes 26 are symmetrically formed along the central axis of the wire mesh structure, so that the wire mesh structure is conveniently fixed with a packing disc by bolts, and the aperture is 2-3 mm.
In the device, the unit arc sheets of the fin structure are formed by bending a silk screen or a sheet into 10-50 degrees, the arc length is 30-80 mm, the distance between every two adjacent arc sheets is 10-40 mm, and the radial thickness is 5-20 mm.
In the working state, the gas-liquid contact mode is reverse contact through the novel structured packing for 3D printing; liquid is sprayed 3D evenly when printing novel regular packing inner edge, receive huge centrifugal force effect, cut into tiny liquid drop, liquid drop this moment also has certain tangential velocity, the probability of colliding with next layer silk screen is very big, at this in-process, liquid probably collides each other and gathers after by the cutting of other silk screen layers, also can directly collide with other layer silk screens, still can return splash back and the collision atomizing of silk screen layer, constantly repeat this process, liquid is just torn into extremely thin liquid drop, liquid silk and liquid film, the gas-liquid area of contact has greatly been increased.
The specific operation steps are as follows: the motor 1 is started, the rotation speed is adjusted to be proper, the lean liquid pump 21 is started, the flow meter 22 is adjusted to control the flow of absorption liquid, the absorption liquid is uniformly sprayed on the inner edge of a 3D printed novel structured packing through the annular liquid distributor, the absorption liquid moves towards the outer edge along the inner edge of the packing under the action of huge centrifugal force, isopropanol gas A is introduced into the embedded rotary packing bed 25 through the gas inlet, the absorption liquid moves towards the inner edge from the outer edge of the packing under the action of pressure, gas and liquid are mixed vigorously in a countercurrent mode, in the process, the liquid is torn into millimeter-nanometer-level liquid filaments, liquid drops and liquid films, the absorption of the isopropanol gas is completed at a fast interface updating rate, the absorbed gas enters a purified gas working section after mist entrainment is eliminated through the rotary demister 10, and the absorption liquid is collected and gathered by the rotary packing bed shell 4 and flows into the isopropanol liquid-rich tank 24 from the liquid outlet 3. And the isopropanol liquid in the rich liquid tank enters a distillation tower to be recycled.
Example (b):
starting a motor, adjusting a rotor of an embedded rotary packed bed for 3D printing of novel structured packing to 800 r/min, starting a barren liquor pump, adjusting a liquid flowmeter to control the flow of an absorbent to be 150L/h, enabling the absorbent to enter the embedded rotary packed bed from a liquid inlet, introducing isopropanol gas with the concentration of 16000 ppm into the embedded rotary packed bed from a gas inlet, and adjusting the gas flow to be 40 m 3 And h, uniformly distributing and spraying the liquid into the inner edge of the 3D printed novel regular packing through the annular liquid distributor, moving towards the outer edge along the inner edge of the packing under the action of huge centrifugal force, enabling the gas containing the isopropanol to be in countercurrent contact with the absorption liquid in the 3D printed novel regular packing, absorbing the isopropanol gas, introducing purified gas coming out from a gas outlet into a purified gas workshop section after absorption is finished, and discharging the absorbent from a liquid outlet. The isopropanol concentration at the gas outlet was analyzed by a gas chromatography detector and found to be 960 ppm.
Claims (6)
1. A method for removing isopropanol gas is characterized in that: the method comprises the following steps of taking a mosaic type rotary packed bed of the 3D printed regular packing as absorption equipment, taking an isopropanol aqueous solution as an absorption liquid, removing isopropanol gas by a physical absorption method, enabling an absorbent and the isopropanol gas to be in contact absorption in a countercurrent mode in the mosaic type rotary packed bed of the 3D printed regular packing, and finishing the removal of the isopropanol gas under the shearing action of the 3D printed regular packing rotating at a high speed; and obtaining a rich solution with higher concentration; the 3D printing structured packing consists of a structured wire mesh structure and a fin structure; the filler is annular, mainly adopts a regular wire mesh structure, and is provided with a fin structure on the outer side; the three-dimensional structure of the regular wire mesh structure is as follows: the regular gas-liquid channel improves the utilization rate of the packing, promotes gas-liquid to be uniformly dispersed, and reduces resistance; the adjacent silk screen layers are staggered by 15-45 degrees, so that the collision probability of liquid and the filler is increased; the thickness of the regular wire mesh structure along the radial direction is 20-50 mm; two holes are symmetrically formed along the central axis of the screen structure, so that the screen structure is conveniently fixed with a packing disc by bolts, and the hole diameter is 2-10 mm;
the fin structure has the following three-dimensional configuration: the unit arc pieces formed by bending the silk screen or the plate are assembled at the outer edge of the silk screen structure and are shaped like a fan blade structure, and the bending direction of the unit arc pieces is opposite to the rotating direction of the rotor; the unit arc sheets of the fin structure are formed by bending silk screen or sheet into 10-50 degrees, the arc length is 30-80 mm, the distance between adjacent arc sheets is 10-40 mm, and the radial thickness is 5-20 mm;
the method for removing the isopropanol gas comprises the following steps:
absorption liquid enters the annular liquid distributor from the liquid inlet pipe, is uniformly sprayed on the inner edge of the lower packing disc of the 3D printing structured packing rotating at a high speed, moves from the inner edge of the packing to the outer edge of the packing along the radial direction, and the passive, static and alternate 3D printing structured packing rings are sheared into liquid filaments, liquid drops and liquid films layer by layer;
simultaneously, isopropanol gas is introduced into the gas inlet pipe, the gas is uniformly distributed on the static packing ring at the outer edge of the upper packing disc, moves towards the lower packing ring which rotates at a high speed and is adjacent to the inner edge, and is sheared by the lower packing ring rotating at the high speed, and then passes through the fin structure at the outer side of the static packing ring again, the gas is eliminated or weakened along the radial rotating trend and the circumferential moving trend which is the same as the rotating direction of the rotor by means of inertia, the gas turbulence degree is increased, finally, the redistributed gas continues to move towards the inner edge and is sheared at the high speed by the lower packing ring rotating at the high speed again, the gas is sheared by the packing rings at intervals of dynamic and static, the mass transfer resistance of a gas film is effectively reduced, the gas phase turbulence degree is increased, and the gas and liquid are in countercurrent contact with each other as a whole; finally, mist in the gas is eliminated by the rotary demister and then is discharged from the gas outlet, and absorption liquid which finishes the absorption process is collected and gathered in the shell of the rotary packed bed and is discharged from the liquid outlet, so that the function of multiple absorption and purification of a single device is realized, and the concentration of the absorption rich liquid is improved;
the liquid-gas volume flow ratio is as follows: 100 to 200; the rotating speed of the embedded rotary packed bed rotor is as follows: 100 to 1800 r/min; the absorption pressure is: 0.1 to 2 MPa; the absorption temperature was: 20 to 100 ℃.
2. An apparatus for removing isopropyl alcohol gas, which is used in the method for removing isopropyl alcohol gas according to claim 1, wherein: the embedded rotary packed bed comprises an embedded rotary packed bed for 3D printing of regular packing, wherein an air inlet pipe and a liquid inlet pipe are arranged on the side surface of a shell of the embedded rotary packed bed, isopropanol gas and absorption liquid are respectively introduced, a gas outlet is formed in the top of the shell and connected with a purified gas working section, a liquid outlet is formed in the bottom of the shell and used for discharging the absorption liquid, the liquid inlet is connected with a pump, and the liquid outlet is connected with a liquid enrichment tank;
the embedded rotary packed bed for printing regular packing by 3D comprises a rotary demister, a rotary packed bed shell, regular packing by 3D printing, an annular liquid distributor and a redistributor, a rotating shaft and a packing rotor, wherein the packing rotor comprises an upper fixed packing disc and a lower independently rotating packing disc, the upper packing disc is fixed with an upper cover plate of the rotary packed bed shell through a cylinder, the upper end of the cylinder is connected with an upper cover plate, the lower end of the cylinder is connected with the top of the upper packing disc, the lower packing disc is connected with the rotating shaft, the lower end of the rotating shaft is connected with a frequency modulation motor, the center of the packing rotor is provided with the annular liquid distributor, and the side surface of the annular liquid distributor is connected with a liquid inlet pipe.
3. The apparatus for removing isopropyl alcohol gas according to claim 2, wherein: the inner part of the embedded rotary packed bed shell is divided into two communicating spaces, and gas collection chambers are arranged above the packed rotor and on the inner side of the cylinder and communicated with the rotary demister; a main chamber is arranged below the filler rotor and communicated with a liquid outlet; the rotating shaft is a solid shaft, is arranged in the center of the shell, is connected with the rotating demister at the upper end and the frequency modulation motor at the lower end, is connected with the lower packing disc at the middle part, and drives the rotating demister and the lower packing disc to rotate at a high speed through the motor;
the liquid inlet pipes are positioned at two sides of the shell of the embedded rotary packed bed, are connected with the annular liquid distributor and simultaneously feed liquid from two sides or feed liquid in a single direction;
the rotating demister is positioned at the upper part of the rotating packed bed, the bottom of the rotating packed bed is connected with the liquid collecting tank, and the rotating demister is connected with the rotating shaft and is driven by a motor to rotate;
the upper packing disc and the lower packing disc are respectively provided with a plurality of circles of grooves, 3D printing structured packing is arranged in the grooves and fixed with the packing discs through bolts, and gas short circuit is prevented; two layers of regular packing rings are respectively arranged on the inner radial outer diameter and the outer radial outer diameter, wherein the regular packing rings are static, dynamic and alternate, the rings are buckled, and a gap is reserved between every two adjacent rings.
4. The apparatus for removing isopropyl alcohol gas according to claim 2, wherein: the annular liquid distributor comprises an annular pipe and branch pipes, wherein the annular pipe is connected with the liquid inlet pipe, the branch pipes are perpendicular to the annular pipe and are uniformly arranged along the annular pipe by 2-6, the branch pipes extend into the inner side of the center of the packing rotor in the direction, the packing rotors are arranged outside the annular pipe and the branch pipes, and a plurality of holes are uniformly formed in the pipe wall of each branch pipe;
the holes are circular holes or grid holes; the number of holes is determined by the liquid flow rate and flow rate.
5. The apparatus for removing isopropyl alcohol gas according to claim 2, wherein: the redistributor comprises a liquid collecting tank and a flow guide pipe, wherein the liquid collecting tank is positioned at the bottom of the rotary demister and is connected with the inner wall of the shell of the rotary bed, and the liquid collecting tank is connected with the inner side of the fixed upper packing disc through the flow guide pipe; the liquid thrown out from the demister is collected by the shell and flows into the liquid collecting tank and flows to the center of the filler rotor along the flow guide pipe.
6. The apparatus for removing isopropyl alcohol gas according to claim 5, wherein: the liquid collecting tank is a circular ring, the section of the liquid collecting tank is a U-shaped groove consisting of an annular thin plate, an inner cylinder and the inner wall of the shell of the rotating bed, the liquid collecting tank is positioned at the inner side of the shell of the rotating bed, and the annular thin plate is vertical to the inner wall of the shell, welded on the inner wall of the shell and used for collecting liquid in the demister; the inner cylinder is concentric with the shell and is welded with the annular thin plate into a whole; the height of the inner cylinder is determined by the flow of the absorption liquid, and the amount of the collected liquid cannot exceed the height of the cylinder;
the flow guide pipes are round pipes, are arranged below the liquid collecting tank, are uniformly arranged in 2-8 numbers, are uniformly arranged in the circumferential direction of the liquid collecting tank in an inclined downward mode towards the direction of the circle center and are connected with the inner side of the upper packing disc; the diameter of the draft tube is determined by the flow velocity of the absorption liquid, and the flow velocity of the absorption liquid is controlled to be 0.01-2 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541562.XA CN110339675B (en) | 2019-06-21 | 2019-06-21 | Method and device for removing isopropanol gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541562.XA CN110339675B (en) | 2019-06-21 | 2019-06-21 | Method and device for removing isopropanol gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110339675A CN110339675A (en) | 2019-10-18 |
| CN110339675B true CN110339675B (en) | 2022-10-21 |
Family
ID=68182664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910541562.XA Active CN110339675B (en) | 2019-06-21 | 2019-06-21 | Method and device for removing isopropanol gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110339675B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110898466A (en) * | 2019-12-07 | 2020-03-24 | 陈龙刚 | Electromagnetic stirring separation device for biological pharmacy |
| CN111974181B (en) * | 2020-08-31 | 2022-08-16 | 杭州易佑农业生产资料有限公司 | Flue gas processing apparatus in pitch workshop |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745245A (en) * | 2010-02-05 | 2010-06-23 | 北京化工大学 | Multi-level countercurrent rotating bed reaction and rectification device and application thereof |
| CN103463938A (en) * | 2013-09-07 | 2013-12-25 | 中北大学 | Device and process method for removing volatile organic compound contained in industrial waste gas |
| WO2015101826A1 (en) * | 2013-12-31 | 2015-07-09 | Hindustan Petroleum Corporation Ltd. | Rotating packed bed unit |
| CN106693858A (en) * | 2015-07-22 | 2017-05-24 | 北京化工大学 | Anti-blocking type super gravity rotating bed and system device comprising anti-blocking type super gravity rotating bed and application |
| CN108159844A (en) * | 2018-01-22 | 2018-06-15 | 中北大学 | The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) |
| CN108748973A (en) * | 2018-05-22 | 2018-11-06 | 中北大学 | The high-gravity rotating bed 3D printing method with gas compensation formula sector structured packing |
-
2019
- 2019-06-21 CN CN201910541562.XA patent/CN110339675B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745245A (en) * | 2010-02-05 | 2010-06-23 | 北京化工大学 | Multi-level countercurrent rotating bed reaction and rectification device and application thereof |
| CN103463938A (en) * | 2013-09-07 | 2013-12-25 | 中北大学 | Device and process method for removing volatile organic compound contained in industrial waste gas |
| WO2015101826A1 (en) * | 2013-12-31 | 2015-07-09 | Hindustan Petroleum Corporation Ltd. | Rotating packed bed unit |
| CN106693858A (en) * | 2015-07-22 | 2017-05-24 | 北京化工大学 | Anti-blocking type super gravity rotating bed and system device comprising anti-blocking type super gravity rotating bed and application |
| CN108159844A (en) * | 2018-01-22 | 2018-06-15 | 中北大学 | The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) |
| CN108748973A (en) * | 2018-05-22 | 2018-11-06 | 中北大学 | The high-gravity rotating bed 3D printing method with gas compensation formula sector structured packing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110339675A (en) | 2019-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2486966B1 (en) | Rotating packed bed | |
| CN110339675B (en) | Method and device for removing isopropanol gas | |
| CN104474996B (en) | A kind of rotary packed bed mass transfer of multistage cross flow and consersion unit | |
| US4549998A (en) | Contacting device | |
| CN101306258B (en) | Highly effective spin-rectifying bed | |
| CN102512913B (en) | Liquid distributor for rotary filling bed | |
| CN101912692A (en) | Multilayer heterogenic baffling ring high-speed centrifugal rectifying tower | |
| CN102240461A (en) | Multistage-absorption-type rotating packed bed | |
| CN105920861A (en) | Spray distillation device | |
| CN113082758A (en) | Device for strengthening gas-liquid mass and heat transfer | |
| CN108159844A (en) | The device and method of methanol removal in a kind of pyrolysis product from methyl tertiary butyl ether(MTBE) | |
| CN108786375A (en) | A kind of method and system of discharge gas of the processing containing volatile organic matter | |
| CN111939726A (en) | Filler absorption tower and application method thereof | |
| CN1611293A (en) | Ultragravity field rotary bed mass transfer and conversion unit | |
| CN1415396A (en) | Deflection of jet type revolving bed equipment in hyper gravity field | |
| CN201101903Y (en) | Hypergravity centrifugal separation device with vapour tension compensation | |
| CN101254356A (en) | Concentric ring adverse current type hypergravity swinging bed device | |
| CN211246600U (en) | Filler structure for increasing gas-liquid mass transfer | |
| CN214913503U (en) | Device for strengthening gas-liquid mass and heat transfer | |
| CN103239885A (en) | Supergravity rotating packed bed device with middle feeding function and built-in liquid collection redistributor | |
| CN211837852U (en) | Concentric corrugated ring rotating bed | |
| CN115177963B (en) | Double-dispersion gas-liquid mass transfer device | |
| CN108043191A (en) | A kind of device and method of Sodium/Calcium dual alkali scrubbing FGD process | |
| CN202506295U (en) | Liquid distribution device for rotation packed bed | |
| CN210595354U (en) | Novel stripping tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |