CN220750658U

CN220750658U - Disc type activation unit and equipment for continuously drying and esterifying primary pulp

Info

Publication number: CN220750658U
Application number: CN202322194812.1U
Authority: CN
Inventors: 蔡春生; 谢忠团; 孙文凯; 李星星; 徐鼎峰; 林兴焕
Original assignee: Gannan Normal University
Current assignee: Gannan Normal University
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-04-09
Anticipated expiration: 2033-08-15

Abstract

The utility model discloses a disc type activation unit and continuous drying and esterification raw pulp equipment, which belong to the technical field of bamboo dissolving pulp preparation, and comprise a box body with a cavity, wherein a plurality of heating discs with hollow interiors are arranged in the cavity from top to bottom, the radial two ends of each heating disc are respectively communicated with a heat medium conveying pipeline and a heat medium backflow pipeline, a heat medium inlet is arranged on the box body, and heated heat medium flows into the heating discs in sequence according to the distance from the heat medium inlet; the middle part of the heating disc is provided with a rotating shaft, the part of the rotating shaft positioned in the cavity is provided with an air guide sleeve fixedly connected with the rotating shaft, the side wall of the air guide sleeve is provided with an air outlet, an air flow channel is arranged between the air guide sleeve and the rotating shaft, one end of the air flow channel is communicated with a hot air source, the other end of the air flow channel is communicated with the air outlet, and the size of the air outlet is gradually increased along with the increase of the distance between the air outlet and a heat medium inlet; the effect of reducing the temperature difference between the upper heating section and the lower heating section and the temperature difference in the vertical direction in the same heating section is achieved, and the activation efficiency is improved.

Description

Disc type activation unit and equipment for continuously drying and esterifying primary pulp

Technical Field

The utility model relates to the technical field of bamboo dissolving pulp preparation, in particular to equipment for preparing bamboo dissolving pulp by continuously drying and esterifying raw pulp.

Background

When bamboo dissolving pulp is prepared by using bamboo pulp, the upper and lower temperature requirements inside the disc type activating device are uniform, but the existing disc type activating unit is provided with a first heating disc, a second heating disc and a third heating disc which are respectively connected with an independent steam inlet, an independent exhaust pipe and an independent drain pipe according to the utility model with the application number of 201820068857.0; the steam inlet of the first heating disc is communicated with the inside of the second drying chamber, and the steam inlet of the second heating disc is communicated with the inside of the third drying chamber; the steam inlet of the third heating plate is connected with an external heat saturated steam source so as to gradually heat the materials through steam, but the temperature of the steam is gradually reduced from bottom to top, so that the temperatures of the lower part and the upper part of the drying tank are uneven, and the materials are not thoroughly dried;

the utility model with the application number of 201620124448.9 is characterized in that the disc assembly comprises a plurality of first discs and a plurality of second discs, heating layers are arranged in the first discs and the second discs, materials are heated through the first discs and the second discs during operation, the heating mode can reduce the temperature difference between the first discs and the second discs, but in a space perpendicular to the discs, a certain temperature difference still exists between the drying temperature of the upper-layer materials and the drying temperature of the lower-layer materials.

In summary, there is a lack of a disc type activation unit and a continuous device for drying and esterifying raw pulp in the prior art, which can reduce the temperature difference between the upper layer heating section and the lower layer heating section, and reduce the temperature difference in the vertical direction in the same heating section, thereby improving the activation efficiency of the material.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings in the prior art, and provides a disc type activation unit and equipment for continuously drying and esterifying raw pulp, so that the uniformity of the drying temperature of materials in the disc type activation unit is improved, and the activation efficiency is improved.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a disc type activation unit, which comprises a box body with a cavity inside, wherein a plurality of heating discs with hollow inside are sequentially arranged in the cavity from top to bottom, a heat medium conveying pipeline and a heat medium backflow pipeline are respectively arranged at the radial two ends of each heating disc, the heat medium conveying pipeline and the heat medium backflow pipeline which extend along the height direction of the box body are sequentially communicated with the plurality of heating discs, a heat medium inlet communicated with the heat medium conveying pipeline is arranged on the box body, and heated heat medium sequentially flows into the heating discs according to the distance from the heat medium inlet;

the middle part of the heating disc is provided with a rotating shaft which sequentially penetrates through a plurality of heating discs, a part of the rotating shaft, which is positioned in the cavity, is sleeved with a wind guide sleeve, the wind guide sleeve is fixedly connected with the rotating shaft, the side wall of the wind guide sleeve is provided with a plurality of wind outlet holes, an airflow channel is arranged between the wind guide sleeve and the rotating shaft, one end of the airflow channel is communicated with an outlet of a hot gas source, the other end of the airflow channel is communicated with the wind outlet holes, and the size of the wind outlet holes is gradually increased along with the increase of the distance between the wind outlet holes and the hot medium inlet;

preferably, the air guide sleeve is communicated with an outlet of the hot gas source through a rotary sealing piece, a gas outlet is arranged on the box body, and an inlet of the hot gas source is communicated with the gas outlet through a valve;

preferably, the valve is a three-way valve, the three-way valve is respectively communicated with the gas outlet, the hot gas source and the waste gas containing device through pipelines, and the pipelines for connecting the three-way valve and the hot gas source and the pipelines for connecting the three-way valve and the waste gas containing device are respectively provided with a switch valve;

preferably, the density of the air outlet holes is gradually increased along with the increase of the distance between the air outlet holes and the heat medium inlet;

preferably, the parts of the air guide sleeve provided with the air outlet holes are all provided with filter screens for intercepting materials, and the mesh size of the filter screens is smaller than the particle size of the materials;

preferably, the rotating shaft is fixedly provided with a plurality of rake arms for pushing materials on the heating disc to move, the wind guide sleeve is provided with a plurality of through holes matched with the cross section area of the rake arms, and the rake arms are connected with the through holes through sealing parts;

the utility model also provides equipment for continuously drying and esterifying raw pulp by using the disc type activating unit, which comprises a paddle type drying unit, a flash evaporation drying unit and the disc type activating unit which are sequentially connected in series, wherein the paddle type drying unit is connected with the flash evaporation drying unit, and the flash evaporation drying unit and the disc type activating unit are respectively connected through a conveying belt;

preferably, the blade drying unit comprises a second rotating shaft capable of rotating and a plurality of blades arranged on the second rotating shaft, cavities are formed in the second rotating shaft and the blades, the cavities of the second rotating shaft are respectively communicated with the cavities of the plurality of blades, and the end part of the second rotating shaft is communicated with a heating medium source through a bearing;

preferably, the blade is of a fan-shaped structure, and the chord length of the joint of the fan-shaped structure and the second rotating shaft is smaller than the chord length of the free end of the fan-shaped structure;

preferably, the flash drying unit comprises a flash dryer with a feeding hole at the lower part, a crushing mechanism for scattering materials is arranged at the lower part of the feeding hole, an air inlet for blowing the materials upwards is arranged at one side of the crushing mechanism, the air inlet is connected with a hot air mechanism through a pipeline, and the position of the air inlet along the height direction is not higher than that of the crushing mechanism.

Compared with the prior art, the utility model has the following technical effects:

1. the disc type activation unit adopts a mode that a heat medium conveying pipeline and a heat medium backflow pipeline are arranged, and the heat medium conveying pipeline and the heat medium backflow pipeline are respectively communicated with the two radial sides of a hollow heating disc to heat a plurality of heating discs; because the heating plate far from the heating medium inlet has longer flowing path and relatively lower temperature, the utility model sets the wind-guiding sleeve outside the rotating shaft penetrating the heating plate, sets the air flow channel between the wind-guiding sleeve and the heating plate, the side wall of the wind-guiding sleeve is provided with the air outlet, one end of the air flow channel is communicated with the hot air source, the other end of the air flow channel is communicated with the air outlet, and the size of the air outlet is in direct proportion to the distance between the air outlet and the heating medium inlet, so that the heating plate has relatively low temperature of the heating medium, relatively more hot air content, relatively higher temperature of the heating medium in the heating plate and relatively less hot air content, thereby improving the temperature uniformity between different heating sections of the disc type activating unit; in addition, as the heating medium heats only the heating disc, the temperature of the parts perpendicular to the same heating disc at different heights is uneven, namely the drying temperature of materials close to the heating disc is high, and the drying temperature of materials far away from the heating disc is low.

2. Because the disc type activating unit has a certain requirement on the water content of the material, the requirement on continuous production is hardly met by a single drying device, for example, the limit water content of the material still cannot meet the requirement on the water content of the material by the disc type activating unit after the material is continuously dried for multiple times by the blade type drying unit, the water content of the material can meet the activation requirement after the flash evaporation drying unit is dried at least twice, namely, the conventional single equipment is difficult to meet the requirement on continuous production, and the production efficiency is lower.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of a disc activation unit;

FIG. 2 is a schematic structural view of a rotating shaft;

FIG. 3 is a schematic view of the rake arms and blades in two adjacent heating plates;

fig. 4 is a schematic view showing a front view of a paddle drying unit;

fig. 5 is a schematic top view of a paddle drying unit;

fig. 6 is a schematic structural view of the flash drying unit.

Wherein, 1, cavity; 2. a heating plate; 3. a heat medium delivery pipe; 4. a heat medium return line; 5. a thermal medium inlet; 6. a rotating shaft; 7. an air guiding sleeve; 8. an air outlet hole; 9. an air flow channel; 10. a source of hot gas; 11. rotating the seal; 12. a gas outlet; 13. a valve; 14. an exhaust gas accommodating device; 15. a material outlet; 16. a rake arm; 17. harrow leaves; 18. a sealing member; 19. a second cavity; 20. a second rotating shaft; 21. a paddle; 22. a second feed inlet; 23. a second exhaust port; 24. a moisture removal fan; 25. a second discharge port; 26. a third feed inlet; 27. flash dryer; 28. a crushing mechanism; 29. a third air inlet; 30. a third hot air mechanism; 31. and a third discharge port.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1 to 6, the utility model provides a disc type activation unit, which comprises a box body with a cavity 1 inside, wherein a plurality of heating discs 2 with hollow inside are sequentially arranged in the cavity 1 from top to bottom, a heat medium conveying pipeline 3 and a heat medium return pipeline 4 are respectively arranged at two radial ends of each heating disc 2, the heat medium conveying pipeline 3 and the heat medium return pipeline 4 which extend along the height direction of the box body are sequentially communicated with the plurality of heating discs 2, a heat medium inlet 5 which is communicated with the heat medium conveying pipeline 3 is arranged on the box body, and heated heat medium sequentially flows into the heating discs 2 from far to near the heat medium inlet 5; the middle part of heating dish 2 is equipped with the pivot 6 that runs through a plurality of heating dishes 2 in proper order, and the part cover that pivot 6 is located cavity 1 is equipped with wind-guiding cover 7, and wind-guiding cover 7 and pivot 6 fixed connection, and a plurality of air-out holes 8 have been seted up to the lateral wall of wind-guiding cover 7, are equipped with air current channel 9 between wind-guiding cover 7 and the pivot 6, and air current channel 9 one end is linked together with the export of hot gas source 10, and air current channel 9's the other end is linked together with air-out hole 8, along with the increase of the distance between air-out hole 8 and the thermal medium import 5, the size of air-out hole 8 increases gradually.

Because the distances between the heating plates 2 and the heating medium inlet 5 are different, the temperature of the heating medium flowing into the heating plates 2 is different, so that the temperature of each part in the box body is uneven, and in order to solve the technical problem, the application improves a rotating shaft 6 which sequentially penetrates through a plurality of heating plates 2, an air guide sleeve 7 with an air outlet hole 8 is arranged outside the rotating shaft 6, an air flow channel 9 is arranged between the rotating shaft 6 and the air guide sleeve 7, one end of the air flow channel 9 is connected with a hot gas source 10, the other end of the air flow channel 9 is connected with the air outlet hole 8, under the rotation action of the rotating shaft 6, the hot gas conveyed to the air flow channel 9 is discharged, and the size of the air outlet hole 8 is inversely proportional to the distance between the air outlet hole 8 and the heating medium inlet 5, so that the hot air is sufficient at a part far away from the heating medium inlet 5, and the hot air is less at a part far away from the heating medium inlet 5, so that the temperature of each part in the box body is uniform, and the requirement of material activation is met; in addition, compared with the mode that one heating layer is arranged on each heating plate 2 in the prior art, the utility model greatly reduces the manufacturing cost of the plate type activating unit and is convenient for large-scale popularization and application.

As the preferred embodiment of the utility model, the heating medium is hot oil with the characteristics of controllable temperature, safety and low energy consumption, the air guide sleeve 7 is communicated with the outlet of the hot gas source 10 through the rotary sealing piece 11, the box body is provided with the gas outlet 12, and the inlet of the hot gas source 10 is communicated with the gas outlet 12 through the valve 13; compared with external cold air, the temperature of the gas generated after the material is evaporated is higher, the heating efficiency of the hot gas source 10 can be improved by leading out the gas and then introducing the gas into a heating machine, and the hot gas source 10 is a device capable of heating the gas, such as a heating fan, a heating furnace and the like. The rotary sealing element 11 is only required to be made of the existing parts in the prior art, and the rotary sealing element is not improved by the utility model; the valve 13 is a three-way valve, the three-way valve is respectively communicated with the gas outlet 12, the hot gas source 10 and the waste gas containing device 14 through pipelines, the three-way valve is connected with the hot gas source 10, and the pipelines connected with the waste gas containing device 14 are respectively provided with a switch valve, when the cavity 1 needs to be heated, the switch valve on the pipeline connected with the waste gas containing device 14 is closed, the switch valve on the pipeline connected with the heating fan is opened to enable gas to flow into the heating fan, after the material activation process is finished, the switch valve on the pipeline connected with the heating fan is closed, the switch valve on the pipeline connected with the waste gas containing device 14 is opened, and waste gas is discharged to the waste gas containing device 14; if the discharged waste gas can not reach the standard of directly discharging to the atmosphere, the waste gas is led to a waste gas accommodating device 14 with the functions of purifying and treating the waste gas, the waste gas is discharged to the atmosphere after being treated, and if the discharged waste gas reaches the standard of directly discharging to the atmosphere, the waste gas is directly discharged to the atmosphere; correspondingly, an exhaust gas purifying and treating device can be connected to the air inlet pipeline and/or the exhaust pipeline of the hot gas source 10, and the heated gas is purified and then is led back into the cavity 1. As a preferred embodiment of the present utility model, the gas discharge port 12 is provided on the top cover of the case, and the gas is pumped out of the cavity 1 by the vacuum pump and then is delivered to the hot gas source 10, and the lower part of the case is provided with the material outlet 15, so that the dry material discharged from the material outlet 15 can be directly packaged.

In order to further improve the uniformity of the temperature in the cavity, along with the increase of the distance between the air outlet holes 8 and the heat medium inlet 5, the density of the air outlet holes 8 is gradually increased, in order to avoid the material blocking the air outlet holes 8, a filter screen for intercepting the material is arranged at the position of the air guide sleeve 7, where the air outlet holes 8 are arranged, and the mesh size of the filter screen is smaller than the particle size of the material.

In order to facilitate pushing materials in the upper heating plate 2 to the lower heating plate 2, two adjacent heating plates 2 are taken as a group for description, the diameter of the upper heating plate 2 is smaller than that of the lower heating plate 2, rake arms 16 are arranged on the heating plate 2, a plurality of rake blades 17 are arranged on the rake arms 16, the lower surfaces of the rake blades 17 are attached to the heating plate 2, the rake blades 17 of the upper heating plate 2 are arranged in opposite directions with the rake blades 17 of the lower heating plate 2, so that the upper rake arms 16 can push the materials to the outer edge of the upper heating plate 2, after the materials fall into the lower heating plate 2 from the outer edge, the lower rake arms 16 push the materials to a blanking port of the lower heating plate 2 close to a rotating shaft 6, the materials fall into the lower heating plate 2 from the blanking port, and the large and small drying plates are alternately arranged up and down, so that the materials can continuously flow through the whole cavity 1.

The utility model also provides equipment for continuously drying and esterifying the raw pulp by using the disc type activating unit, which comprises a paddle type drying unit, a flash evaporation drying unit and a disc type activating unit which are sequentially connected in series, wherein the paddle type drying unit is connected with the flash evaporation drying unit, and the flash evaporation drying unit is connected with the disc type activating unit through a conveying belt;

the blade drying unit comprises a second box body with a second cavity 19 inside, a second rotating shaft 20 capable of rotating and a plurality of blades 21 mounted on the second rotating shaft 20 are arranged in the second cavity 19, cavities are formed in the second rotating shaft 20 and the blades 21, the second rotating shaft 20 extends to the cavity part outside the second cavity 19 and is communicated with a heating medium source through bearings, the cavity part of the second rotating shaft 20 positioned in the second cavity 19 is respectively communicated with the cavities of the blades 21, the heating medium source flows into the blades 21 through the second rotating shaft 20, and the blades 21 are in direct contact with materials, so that the heating area of the materials can be increased after the blades 21 are heated, and the heating effect is improved. Further, the blade 21 is in a fan-shaped structure, the chord length of the joint of the fan-shaped structure and the second rotating shaft 20 is smaller than the chord length of the free end of the fan-shaped structure, and two main heat transfer side surfaces of the blade 21 are inclined surfaces; in addition, a scraping plate is arranged at the fan-shaped bottom of the blade 21 so as to scrape the material deposited at the bottom of the shell and prevent dead angles. The upper part of the second box body is respectively provided with a second feeding port 22 and a second exhaust port 23, the second exhaust port 23 is connected with a moisture exhaust fan 24 and is used for exhausting moisture in the second cavity 19, and the lower part of the second box body is provided with a second discharge port 25.

The flash drying unit comprises a flash dryer 27 with a third feed inlet 26 at the lower part, a crushing mechanism 28 for scattering materials is arranged at the lower part of the third feed inlet 26, a third air inlet 29 for blowing the materials upwards is arranged at one side of the crushing mechanism 28, the third air inlet 29 is connected with a third hot air mechanism 30 through a pipeline, the position of the third air inlet 29 along the height direction is not higher than the position of the crushing mechanism 28, the contact area of the materials and a heat medium can be increased by arranging the crushing mechanism 28, and the heat transfer efficiency is improved; as a preferred embodiment of the utility model, natural wind is adopted for drying, after the natural wind passes through an air filter, the natural wind is blown into a steam heat exchanger, a coal-fired or fuel-fired hot blast furnace by a fan and is heated, heated hot wind is distributed into whirlwind with uniform and certain flow velocity and flow direction by a flash host hot blast distributor, the whirlwind enters a flash drying unit through an air inlet and then contacts and collides with crushed materials, a series of physical changes such as heat exchange and separation are started, the materials are separated from moisture, and the dried materials are discharged from a third discharge hole 31. The third feed port 26 is provided with a screw feeder through which material is continuously added to the interior of the flash drying unit cavity.

It should be noted that it will be apparent to those skilled in the art that the present utility model is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A disc activation unit, characterized by: the heating device comprises a box body with a cavity inside, wherein a plurality of heating discs with hollow inside are sequentially arranged in the cavity from top to bottom, a heat medium conveying pipeline and a heat medium backflow pipeline are respectively arranged at the two radial ends of the heating discs, the heat medium conveying pipeline and the heat medium backflow pipeline which extend along the height direction of the box body are sequentially communicated with the plurality of heating discs, a heat medium inlet which is communicated with the heat medium conveying pipeline is arranged on the box body, and heated heat medium sequentially flows into the heating discs according to the distance from the heat medium inlet;

the middle part of heating plate is equipped with and runs through a plurality of in proper order the pivot of heating plate, the pivot is located partial cover in the cavity is equipped with the wind-guiding cover, the wind-guiding cover with pivot fixed connection, a plurality of air-out holes have been seted up to the lateral wall of wind-guiding cover, the wind-guiding cover with be equipped with the air current passageway between the pivot, air current passageway one end is linked together with the export of hot gas source, the other end of air current passageway with the air-out hole is linked together, along with the air-out hole with the increase of distance between the thermal medium import, the size of air-out hole increases gradually.

2. A disc activation unit according to claim 1, characterized in that: the air guide sleeve is communicated with an outlet of the hot gas source through the rotary sealing piece, a gas outlet is formed in the box body, and an inlet of the hot gas source is communicated with the gas outlet through a valve.

3. A disc activation unit according to claim 2, characterized in that: the valve is a three-way valve, the three-way valve is respectively communicated with the gas outlet, the hot gas source and the waste gas containing device through pipelines, the three-way valve is connected with the pipeline of the hot gas source, and the three-way valve is connected with the waste gas containing device through pipelines, and switching valves are arranged on the pipelines.

4. A disc activation unit according to claim 1, characterized in that: and the density of the air outlet holes is gradually increased along with the increase of the distance between the air outlet holes and the heat medium inlet.

5. The disc activation unit of claim 4, wherein: the part of the air guide sleeve, which is provided with the air outlet holes, is provided with a filter screen for intercepting materials, and the mesh size of the filter screen is smaller than the particle size of the materials.

6. A disc activation unit according to claim 1, characterized in that: the rotary shaft is fixedly provided with a plurality of rake arms for pushing materials on the heating plate to move, the air guide sleeve is provided with a plurality of through holes matched with the cross section area of the rake arms, and the rake arms are connected with the through holes through sealing components.

7. An apparatus for continuous drying and esterifying a raw stock using a disc activating unit as claimed in any one of claims 1 to 6, characterized in that: the device comprises a paddle drying unit, a flash drying unit and a disc type activating unit which are sequentially connected in series, wherein the paddle drying unit is connected with the flash drying unit, and the flash drying unit is connected with the disc type activating unit through a conveying belt respectively.

8. The apparatus for continuously drying and esterifying a raw stock as recited in claim 7, wherein: the blade drying unit comprises a second rotating shaft capable of rotating and a plurality of blades arranged on the second rotating shaft, cavities are formed in the second rotating shaft and the blades, the cavities of the second rotating shaft are respectively communicated with the cavities of the blades, and the end part of the second rotating shaft is communicated with a heating medium source through a bearing.

9. The apparatus for continuously drying and esterifying a raw stock as recited in claim 8, wherein: the blade is of a fan-shaped structure, and the chord length of the joint of the fan-shaped structure and the second rotating shaft is smaller than the chord length of the free end of the fan-shaped structure.

10. The apparatus for continuously drying and esterifying a raw stock as recited in claim 9, wherein: the flash drying unit comprises a flash dryer with a feeding hole at the lower part, a crushing mechanism for scattering materials is arranged at the lower part of the feeding hole, an air inlet for blowing the materials upwards is arranged on one side of the crushing mechanism, the air inlet is connected with a hot air mechanism through a pipeline, and the position of the air inlet along the height direction is not higher than that of the crushing mechanism.