CN213100890U

CN213100890U - Stirring device for efficiently recovering NMP solvent in polymer

Info

Publication number: CN213100890U
Application number: CN202021265986.2U
Authority: CN
Inventors: 李海明; 魏强; 张婉婧; 张斌; 王国军
Original assignee: Xinjiang Markorchem Co ltd
Current assignee: Xinjiang Markorchem Co ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-05-04
Anticipated expiration: 2030-07-02

Abstract

The utility model relates to a NMP solvent recovery technical field in natural gas acetylene chemical production, a high efficiency is retrieved agitating unit of NMP solvent in polymer, it includes the dry distillation jar, driving motor, the paddle board, the transmission shaft, mechanical seal, driving motor bottom fixed mounting has the reduction gear, axis of rotation lower extreme fixed mounting has two above paddle boards, every paddle board bottom fixed mounting has a broach No. two above, No. two broach of every broach lower extreme fixedly connected with, the axis of rotation lower extreme cover on paddle board upper portion is equipped with the fixed cover card, two at least fixed bracing of fixedly connected with between fixed cover card and the paddle board, dry distillation jar lower part is provided with the slagging-off manhole. The utility model has the advantages of reasonable and compact structure, convenient to use, it can utilize the stirring to accelerate NMP solvent vaporization rate in the retort, but the high-efficient NMP solvent of retrieving the cycle recycle that shortens the operating cycle of retort simultaneously greatly, fully practices thrift the cost, has safety, laborsaving, simple and convenient, efficient characteristics.

Description

Stirring device for efficiently recovering NMP solvent in polymer

Technical Field

The utility model relates to a NMP solvent recovery technical field in the natural gas acetylene chemical production is a high-efficient agitating unit who retrieves NMP solvent in the polymer.

Background

The name of the compound is N-methyl pyrrolidone, colorless, tasteless and transparent oily liquid, and can be dissolved in most organic and inorganic compounds, polar gases, natural gas and synthetic high molecular compounds. In the process of preparing acetylene from natural gas, NMP solvent is used as a circulating solvent in a concentration section and is used for purifying acetylene.

In the prior art, NMP loss in the process of preparing acetylene from natural gas is mostly in a dry distillation device. The NMP solvent absorbed with the higher alkyne gas is mixed in the NMP solvent because of the change of temperature and pressure when the higher alkyne is polymerized to form solid polymer in the circulating process. In order to avoid blocking the filler and the tower tray due to overhigh polymer content, the dry distillation device is specially arranged, NMP solvent with high polymer content is continuously extracted by using the cyclone separator, the NMP solvent in the dry distillation tank is vaporized by heating external steam under the pressure of about 0.005MPa (absolute), and dry polymer residues are left after about 20 hours, so that the operation period is longer. Because of the intermittent evaporation, which is faster at the beginning and gradually slower at the end, the vaporization is not complete and the NMP solvent in the polymer residue is not completely vaporized. The long-term operation causes the loss of a large amount of NMP solvent along with the deslagging operation, and the waste of the NMP solvent is caused.

Disclosure of Invention

The utility model provides a high-efficient agitating unit who retrieves NMP solvent in polymer has overcome above-mentioned prior art not enough, and it can effectively solve the dry distillation device life cycle that exists among the current natural gas acetylene chemical production, the extravagant problem of NMP solvent.

The technical scheme of the utility model is realized through following measure: a stirring device for efficiently recovering an NMP solvent in a polymer comprises a dry distillation tank, a driving motor, paddle boards, a transmission shaft and a mechanical seal, wherein a speed reducer is fixedly arranged at the bottom of the driving motor, a connecting hole is formed in the center of the top of the dry distillation tank, the upper end of the transmission shaft extends out of the connecting hole in the top of the dry distillation tank and is fixedly connected with the bottom of the speed reducer, more than two paddle boards are fixedly arranged at the lower end of a rotating shaft, more than two comb teeth are fixedly arranged at the bottom of each paddle board, the lower end of each comb tooth is fixedly connected with a second comb tooth, a fixing sleeve clamp is sleeved at the lower end of the rotating shaft at the upper part of each paddle board, at least two fixing inclined struts are fixedly connected between the fixing sleeve clamp and the paddle boards, a positioning bearing is fixedly arranged in the center of the, the right side of the top of the dry distillation tank is provided with a vacuumizing exhaust port, and the lower part of the dry distillation tank is provided with a deslagging manhole.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the height of the paddle board is higher than that of the deslagging manhole.

The length of the single paddle board is less than the radius of the retort, the length of the single paddle board is more than half of the radius of the retort, and the width of the single paddle board is 15 cm-40 cm.

The length of the first comb teeth is 10cm, the length of the second comb teeth is 30cm to 40cm, and the included angle between the lower ends of the first comb teeth and the upper ends of the second comb teeth is larger than 90 degrees.

The distance between the lower end of the second comb teeth and the bottom of the retort is 10cm to 15 cm.

The included angle between the paddle board and the horizontal plane is 15 degrees.

The outer wall of the retort is wrapped with a heating coil.

The positioning bearing is a rolling bearing.

The driving motor is an explosion-proof three-phase asynchronous motor.

The transmission shaft is a circular single shaft.

The utility model has the advantages of reasonable and compact structure, convenient to use, it can utilize the stirring to accelerate NMP solvent vaporization rate in the retort, but the high-efficient NMP solvent of retrieving the cycle recycle that shortens the operating cycle of retort simultaneously greatly, fully practices thrift the cost, has safety, laborsaving, simple and convenient, efficient characteristics.

Drawings

FIG. 1 is a schematic view of the retort of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure of the paddle board of the present invention.

Fig. 3 is a schematic view of the top view structure of the paddle board of the present invention.

The codes in the figures are respectively: 1 is the retort, 2 is driving motor, 3 is the paddle, 4 is the transmission shaft, 5 is mechanical seal, 6 is the reduction gear, 7 is heating coil, 8 is the broach No. one, 9 is the broach No. two, 10 is fixed cover card, 11 is fixed bracing, 12 is the location bearing, 13 is the feed port, 14 is the evacuation gas vent, 15 is the slagging-off manhole.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in attached figures 1, 2 and 3, the stirring device for efficiently recovering the NMP solvent in the polymer comprises a dry distillation tank 1, a driving motor 2, a paddle board 3, a transmission shaft 4 and a mechanical seal 5, wherein a speed reducer 6 is fixedly arranged at the bottom of the driving motor 2, a connecting hole is formed in the center of the top of the dry distillation tank 1, the upper end of the transmission shaft 4 extending out of the top of the dry distillation tank 1 is fixedly connected with the bottom of the speed reducer 6, more than two paddle boards 3 are fixedly arranged at the lower end of a rotating shaft 4, more than two first comb teeth 8 are fixedly arranged at the bottom of each paddle board 3, a second comb tooth 9 is fixedly connected at the lower end of each first comb tooth 8, a fixed sleeve clamp 10 is sleeved at the lower end of the rotating shaft 4 at the upper part of each paddle board 3, at least two fixed inclined struts 11 are fixedly connected between the fixed sleeve clamp 10 and, a mechanical seal 5 is arranged between a connecting hole in the top of the dry distillation tank 1 and the rotating shaft 4, a feeding hole 13 is formed in the left side of the top of the dry distillation tank 1, a vacuumizing exhaust port 14 is formed in the right side of the top of the dry distillation tank 1, and a slag removal manhole 15 is formed in the lower portion of the dry distillation tank 1.

In the prior art, the dry distillation system at the concentration section of the process for preparing acetylene from natural gas comprises three dry distillation tanks 1 connected in parallel, wherein the dry distillation tank 1 heats and vaporizes an NMP solvent in the tank in a negative-pressure high-temperature mode to achieve the effect of separating the NMP solvent from a polymer, when the dry distillation tank 1 runs, slurry in the tank is in a static state, the vaporization speed of the NMP solvent is low, when the polymer on the surface of the slurry is hardened, NMP solvent gas at the bottom of the dry distillation tank 1 cannot be separated out, most of the NMP solvent gas can be vaporized within a long time, the production cost is increased, and the NMP solvent which is not vaporized during deslagging can cause personal injury to operators; the utility model discloses in, through improving current dry distillation jar 1, increase paddle 3, broach 8, No. two broach 9 and stir, the thick liquid is stirred rotatory and is kept slow flow in the dry distillation jar 1, and the polymer of 1 internal surface of dry distillation jar just can not harden like this, and the NMP solvent of lower part just can better vaporization, has shortened dry distillation jar 1's operating cycle greatly, and NMP solvent rate of recovery has very big improvement before than moreover. Adopt the utility model discloses afterwards, NMP solvent recovery rate can reach 99.9% (96.4% before the transformation), and 1 operating cycle of retort shortens to 4h, and steam 11.52t/h can be practiced thrift to three retort 1, practices thrift about 700 ten thousand yuan/year of cost, has fully improved production efficiency, has practiced thrift time and cost.

The utility model discloses in, mechanical seal 5's model can be C8BV-70 TP-SGF 88/2, and mechanical seal 5 can ensure that retort 1 does not have the gas leakage at the stirring operation in-process, and reduction gear 6's model can be RF 97, and reduction gear 6's model also can be selected according to the concentration of the interior thick liquids of retort 1.

The stirring device for efficiently recovering the NMP solvent in the polymer can be further optimized or/and improved according to actual needs:

as shown in fig. 1, the height of the paddle board 3 is higher than the height of the deslagging manhole 15. Avoiding the paddle 3 from hindering the deslagging operation. The radius of the deslagging manhole 15 can be 340 mm.

As shown in figure 1, the length of the single paddle 3 is smaller than the radius of the retort 1, the length of the single paddle 3 is larger than half of the radius of the retort 1, and the width of the single paddle 3 is 15cm to 40 cm. Because the NMP solvent is continuously vaporized, the content of the polymer in the retort 1 is relatively continuously increased, the viscosity of the mixture is continuously increased, the pulp plate 3 not only can play a role in stirring, but also can reduce the resistance as much as possible, and the pulp plate 3 can be made of stainless steel.

As shown in the attached figures 1 and 2, the length of the first comb teeth 8 is 10cm, the length of the second comb teeth 9 is 30cm to 40cm, and the included angle between the lower ends of the first comb teeth 8 and the upper ends of the second comb teeth 9 is larger than 90 degrees. No. 8, No. two broach 9 can adopt 4mm thick carbon steel plate to make, and the size of No. 8, No. two broach 9 can be adjusted according to actual need. At 1 operation later stage of retort, because of a large amount of liquid vaporization, the mixture liquid level descends, the pulp sheet 3 exposes the liquid surface, can't continue effective stirring, guarantee the stirring effect for the maximize, utilize a bolted connection broach 8 on every pulp sheet, No. two broach 9, broach 8, No. two broach 9's quantity can increase and decrease according to actual need, with bolted connection, avoid appearing welding interface, the later maintenance of being convenient for (because the device overhauls and belongs to limited space, consider the safety inspection, be difficult for moving the fire operation in inside).

As shown in attached figures 1 and 2, the distance between the lower end of the second comb teeth 9 and the bottom of the retort 1 is 10cm to 15 cm. No. 8, No. 9 broach can guarantee to stir effectively when the liquid level is lower in retort 1, and retort 1 radius can be 1000mm, and retort 1 volume can be for the 5.46m year of cultivation.

As shown in fig. 1 and 2, the included angle between the paddle 3 and the horizontal plane is 15 °.

As shown in figure 1, the outer wall of the retort 1 is wrapped with a heating coil 7. The heating coil 7 heats the slurry in the retort 1 to promote vaporization of the slurry.

As shown in fig. 1, the positioning bearing 12 is a rolling bearing. The rolling bearing can be a TURNUP 32020 model, and the positioning bearing 12 can fix the rotating shaft 4 to prevent the rotating shaft 4 from moving in the stirring process.

As shown in fig. 1, the driving motor 2 is an explosion-proof three-phase asynchronous motor. The type of the explosion-proof three-phase asynchronous motor can be YB 132S-4/380V. The type of the driving motor 2 can also be selected according to the concentration of the slurry in the retort 1 so as to safely and efficiently stir, and the driving motor 2 can be started intermittently.

As shown in fig. 1, the drive shaft 4 is a circular single shaft.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

The utility model discloses best embodiment's use: in the acetylene preparation concentration working section by natural gas, a polymer to be concentrated and dry distilled enters a dry distillation tank 1 through a feed hole 13, a driving motor 2 drives a speed reducer 6, a transmission shaft 4, a paddle board 3, a first comb 8 and a second comb 9 to stir the polymer in the dry distillation tank 1, the polymer in the dry distillation tank 1 is heated by a heating coil 7, the dry distillation tank 1 is vacuumized through a vacuumizing exhaust port 14, an NMP solvent in the polymer in the dry distillation tank 1 is continuously vaporized under the conditions of negative pressure high temperature and intermittent stirring, and after the vaporization of the NMP solvent is finished, residual polymer residues in the dry distillation tank 1 are discharged through a deslagging manhole 15.

Claims

1. A stirring device for efficiently recovering an NMP solvent in a polymer is characterized by comprising a dry distillation tank, a driving motor, paddle boards, a transmission shaft and a mechanical seal, wherein a speed reducer is fixedly arranged at the bottom of the driving motor, a connecting hole is formed in the center of the top of the dry distillation tank, the upper end of the transmission shaft extends out of the top of the dry distillation tank and is fixedly connected with the bottom of the speed reducer, more than two paddle boards are fixedly arranged at the lower end of a rotating shaft, more than two comb teeth are fixedly arranged at the bottom of each paddle board, the lower end of each comb tooth is fixedly connected with two comb teeth, a fixed sleeve clamp is sleeved at the lower end of the rotating shaft at the upper part of each paddle board, at least two fixed inclined struts are fixedly connected between the fixed sleeve clamp and the paddle boards, a positioning bearing is fixedly arranged in the, the left side of the top of the dry distillation tank is provided with a feeding hole, the right side of the top of the dry distillation tank is provided with a vacuumizing exhaust port, and the lower part of the dry distillation tank is provided with a deslagging manhole.

2. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1, wherein the height of the paddle board is higher than that of the manhole for removing a residue.

3. The stirring apparatus for efficiently recovering an NMP solvent in a polymer according to claim 1 or 2, wherein the length of the single paddle is shorter than the radius of the retort, the length of the single paddle is longer than a half of the radius of the retort, and the width of the single paddle is 15cm to 40 cm.

4. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the length of the first comb teeth is 10cm, the length of the second comb teeth is 30cm to 40cm, and the angle between the lower ends of the first comb teeth and the upper ends of the second comb teeth is greater than 90 °.

5. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the distance between the lower ends of the second comb teeth and the bottom of the retort is 10cm to 15 cm.

6. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the angle between the paddle and the horizontal plane is 15 °.

7. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the outer wall of the retort is covered with a heating coil.

8. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the positioning bearing is a rolling bearing.

9. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the driving motor is an explosion-proof three-phase asynchronous motor.

10. The stirring apparatus for efficiently recovering an NMP solvent from a polymer according to claim 1 or 2, wherein the driving shaft is a circular single shaft.