CN218421053U - Multi-element hot air spray dryer - Google Patents

Abstract

The utility model relates to a field of spray drying technique discloses a hot-blast spray drier of many units, including the drying can, seted up drying chamber in the drying can, be provided with on the drying can and be used for letting in the outer passageway of low velocity of flow time high temperature air current in to drying chamber, be provided with in the outer passageway and be used for letting in the interior passageway of high velocity of flow high temperature air current in to drying chamber, the atomizing device is installed in the position department that corresponds interior passageway in drying chamber. This application has drying efficiency height, avoids the material to adhere to the effect of inner wall.

Description

Multi-element hot air spray dryer

Technical Field

The application relates to the field of spray drying technology, in particular to a multi-element hot air spray dryer.

Background

The spray dryer is a device capable of simultaneously performing drying and granulation, and is widely used for manufacturing dry fuel, soap powder, inorganic salt and the like.

At present common spray drier structure includes the fuselage, the drying chamber has been seted up in the fuselage, atomizer is installed at the top of drying chamber, the drying chamber top is provided with the hot air channel who is used for letting in the high temperature air current in atomizer's week side, during the use, earlier heat material solution, spout into to the drying chamber in atomizer atomizing again, hot air channel inputs hot-blastly in to the drying chamber simultaneously, hot-blastly take the in-process of atomizing material downstream, detach moisture and accomplish the drying and the granulation of material.

In the above related art, the temperature of the inner wall of the drying chamber is lower than that of the atomized material, the atomized material is likely to contact with the inner wall of the drying chamber in the falling process, the moisture in the material particles at the top is not completely evaporated, and the material is likely to adhere to the inner wall of the drying chamber.

SUMMERY OF THE UTILITY MODEL

In order to prevent the adhesion inner wall of dry material, this application provides a many first hot-blast spray drier.

The application provides a many first hot-blast spray drier adopts following technical scheme:

the utility model provides a many first hot-blast spray drier, includes the drying can, the drying chamber has been seted up in the drying can, be provided with on the drying can be used for to let in the outer passageway of low velocity of flow time high temperature air current in the drying chamber, be provided with in the outer passageway be used for to let in the interior passageway of high velocity of flow high temperature air current in the drying chamber, in the drying chamber in corresponding the position department of interior passageway installs atomizing device.

By adopting the technical scheme, when the device is used, the atomizing device atomizes and sprays the materials into the high-flow-rate high-temperature airflow supplied by the inner channel, the materials absorb heat, the moisture on the outer surface of the particles is quickly gasified to reach the expected moisture content, meanwhile, the volume is expanded, the particles are diffused into the low-flow-rate secondary high-temperature airflow supplied by the outer channel, and further drying is carried out; in this application, set up outer passageway, through feeding low velocity of flow time high temperature air current in to the drying cylinder, form and be used for restraining the air curtain that does not dry material circumference scatters, accelerate the falling speed of marginal material, reduce the diffusion radius of material drying process to greatly reduced material is not dry just with the probability of inner wall contact, the realization prevents the effect of adhering to the inner wall.

Preferably, a rectifying plate for rectifying the airflow into parallel airflow is arranged in one end of each of the outer channel and the inner channel, which is close to the drying tank.

By adopting the technical scheme, the mutual interference between the high-flow-rate high-temperature airflow and the low-flow-rate secondary high-temperature airflow is reduced.

Preferably, a partition plate is arranged on one side of the atomizing device in the drying chamber, an upper discharging channel for discharging is formed between the partition plate and the inner wall of the drying chamber, and cyclone separation equipment connected with the upper discharging channel is arranged on the side wall of the drying tank.

By adopting the technical scheme, the particles suspended in the drying chamber are discharged through the upper discharge channel and the cyclone separation equipment in sequence.

Preferably, a separation plate is installed in the upper discharge channel, a lower discharge channel is formed between the separation plate and the inner wall of the drying chamber, the height of an inlet of the lower discharge channel is lower than that of an inlet of the upper discharge channel, and the cyclone separation equipment is connected with the lower discharge channel; the bottom of drying cabinet is provided with the perforated plate, perforated plate below is provided with dehumidification warm braw passageway.

Through adopting above-mentioned technical scheme, fall on the granule in drying chamber bottom, humidity is big volumetrically, and the warm wind passageway that dehumidifies blows the granule through the perforated plate, does secondary drying process to the granule, ensures the drying effect of granule.

Preferably, the perforated plate is lower in height on one side close to the inlet of the lower discharge channel than on the other side.

Through adopting above-mentioned technical scheme, utilize granule dead weight guide granule to be close to discharge channel entry down.

Preferably, a dehumidifying cold air channel is arranged below the porous plate and corresponds to the inlet of the lower discharging channel.

Through adopting above-mentioned technical scheme, when the discharging channel was gone into to the granule, adopted dehumidification cold wind air current to cool down the processing to the granule, prevented that the granule from attaching to the cyclone inner wall, in addition, the dehumidification cold wind passageway sets up towards discharging channel entry down, and the dehumidification cold wind air current gets into in the cyclone through discharging channel down to play the effect to the cyclone cooling.

Preferably, the cyclone separation equipment comprises a secondary cyclone separator and a primary cyclone separator connected to an upper connector of the secondary cyclone separator, a feed inlet of the primary cyclone separator is communicated with the upper discharge channel, and the secondary cyclone separator is communicated with the lower discharge channel.

Through adopting above-mentioned technical scheme, because the particle temperature of suspension in dry chamber is higher, to avoid the high wall that glues of particle temperature, the particle of suspension is through the preliminary cooling of one-level cyclone, further fully cools down at second grade cyclone again to the condition of avoiding the particle to glue the wall takes place.

Preferably, a first spray head is installed at the top of the drying chamber, a second spray head is installed in the upper discharging channel, and a third spray head is installed in the lower discharging channel.

Through adopting above-mentioned technical scheme, carry out abundant cleaning to the drying cylinder.

In summary, the present application includes at least one of the following beneficial technical effects:

the method has the advantages that the undried materials are prevented from adhering to the inner wall, the low-flow-rate secondary high-temperature airflow is fed through the outer channel, an air curtain for inhibiting the undried materials from scattering in the circumferential direction is formed on the periphery side of the high-flow-rate high-temperature airflow, the diffusion radius of the materials in the drying process is reduced, the probability that the materials are in contact with the inner wall without being dried is greatly reduced, and the effect of preventing the adhesion to the inner wall is achieved;

the volume of the drying chamber is reduced, the material particles sprayed in an atomizing mode are distributed in the drying chamber in a normal distribution mode, the diffusion radius of the material in the drying process is reduced by arranging the outer channel, and the volume of the drying chamber is reduced to be less than one fifth of the volume of the traditional drying chamber;

the drying and granulating efficiency is greatly improved, the drying mode applied by the method is two steps, wherein in the first step, atomized particles are subjected to high-temperature treatment at an inner channel, the moisture on the surfaces of the particles is quickly gasified, in the second step, the atomized particles are transferred to an outer channel under the action of gas expansion, the water vapor in the particles is completely discharged through secondary high-temperature treatment, the particles are fully dried, and the drying and granulating efficiency is higher;

granule quality after the dry granulation is high, and this application is earlier dry to anticipated moisture content in the twinkling of an eye particle surface, and particle surface is still soft this moment, is carrying out time high temperature treatment, further the inside moisture of dry granule, and the inside moisture gasification inflation of granule, fracture, discharge can automatic recovery at the line that the particle surface formed to the granule surface is mellow and full and moist after guaranteeing the granulation.

Drawings

Fig. 1 is a schematic structural diagram of a multiple hot air spray dryer according to an embodiment of the present disclosure.

Description of reference numerals: 1. a drying tank; 2. a drying chamber; 3. an outer channel; 4. an inner channel; 5. an atomizing device; 6. a rectifying plate; 7. a partition plate; 8. an upper discharge channel; 9. a separator plate; 10. a lower discharge channel; 11. a perforated plate; 12. a dehumidification warm air channel; 13. a dehumidification cold air channel; 14. a secondary cyclone separator; 15. a primary cyclone separator; 16. a first shower head; 17. a second shower head; 18. and a third spray header.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses a multi-element hot air spray dryer and a drying method.

Referring to fig. 1, a multi-element hot air spray dryer comprises a drying tank 1, wherein the cross section of the drying tank 1 is rectangular or circular, a drying chamber 2 is formed in the drying tank 1, an outer channel 3 used for introducing low-flow-rate secondary high-temperature air flow into the drying chamber 2 is installed at the top of the drying tank 1, the temperature of the air flow introduced from the outer channel 3 is 70 ℃ -100 ℃, an inner channel 4 used for introducing high-flow-rate high-temperature air flow into the drying chamber 2 is arranged in the outer channel 3, the temperature of the air flow introduced from the inner channel 4 is 200 ℃ -345 ℃, the outer channel 3 and the inner channel 4 adopt cylindrical channels, the outer channel 3 and the inner channel 4 are concentrically arranged, an atomizing device 5 is installed at a position corresponding to the inner channel 4 in the drying chamber 2, the atomizing device 5 is arranged at the center of the inner channel 4, the spraying direction of the atomizing device 5 is arranged downwards, and the atomizing device 5 adopts a pressure atomizing nozzle.

When the device is used, the atomizing device 5 atomizes and sprays the liquid raw material in the drying chamber 2, the atomized raw material is firstly contacted with high-flow-rate high-temperature airflow, moisture is instantly evaporated from the surface of particles, the outer surface of the particles is instantly dried to the expected moisture content, the volume of the atomized raw material is rapidly expanded along with the change of the moisture from the liquid state to the gaseous state, the atomized raw material is diffused into low-flow-rate secondary high-temperature airflow, the coking of the surface of the particles or the formation of a drying film, which can damage the quality of the material, is avoided by reducing the temperature of the airflow, the moisture in the particles can be prevented from being discharged if the drying film is formed, and after the particles are sufficiently dried, because the bubbles of the water vapor in the particles are broken, the internal moisture can be diffused out, the drying film is damaged, and wrinkles, cracks or multiple layers are formed under the outer surface of the particles, so that the quality of the particles is reduced; in low-flow-rate secondary high-temperature airflow, water vapor bubbles in the particles are broken, internal moisture is discharged, the outer surfaces of the particles are soft under the condition that the outer surfaces of the particles are in an expected moisture content state, and the broken parts of the water vapor bubbles can be closed again, so that the drying quality of the particles is ensured; because the low-flow-rate secondary high-temperature air flow is arranged around the high-flow-rate high-temperature air flow, under the action of pressure, the particles move to the high-flow-rate high-temperature air flow in the falling process, and the particles stay in the high-flow-rate high-temperature air flow while the initial drying speed is improved, so that the condition that the non-dried substances are attached to the inner wall is avoided.

Referring to fig. 1, the rectifying plates 6 for rectifying the air flow into parallel air flow are respectively arranged in one end of the outer channel 3 and one end of the inner channel 4 close to the drying tank 1, and in this embodiment, the rectifying plates 6 adopt honeycomb modules made of porous discs and thin plates and guide the air flow to flow vertically downwards so as to reduce the mutual interference between the high-flow-rate high-temperature air flow and the low-flow-rate secondary high-temperature air flow, so that an air curtain is formed conveniently and the adhesion of the undried matter to the inner wall is prevented.

One side of atomizing device 5 is provided with baffle 7 in drying chamber 2, form the last discharging channel 8 that is used for the ejection of compact between baffle 7 and the drying chamber 2 inner wall, drying can 1 lateral wall is provided with the cyclone separation equipment of being connected with last discharging channel 8, cyclone separation equipment is two-stage cyclone, it includes one-level cyclone 15 and second grade cyclone 14, one-level cyclone 15 is connected in second grade cyclone 14 upper interface, the feed inlet of one-level cyclone 15 and last discharging channel 8 intercommunication, the granule water content of suspension in drying chamber 2 is low, and is light in weight, get into one-level cyclone 15 through the higher last discharging channel 8 of opening and accomplish solid-gas separation, fall into second grade cyclone 14 again, discharge after reseparating once, because the granule temperature of suspension in drying chamber 2 is higher, in order to avoid granule temperature height to glue the wall, the granule of suspension is through one-level cyclone 15 preliminary cooling, further fully cool down at second grade cyclone 14, thereby avoid the condition that the granule glues the wall to take place.

Referring to fig. 1, a partition plate 9 is installed in an upper discharging channel 8, a lower discharging channel 10 is formed between the partition plate 9 and the inner wall of a drying chamber 2, the inlet height of the lower discharging channel 10 is lower than that of the upper discharging channel 8, a feeding port of a secondary cyclone separator 14 is communicated with the lower discharging channel 10, a porous plate 11 is arranged at the bottom of the drying tank 1, one side, close to the inlet of the lower discharging channel 10, of the porous plate 11 is lower than the other side, particles guided by gravity to approach the lower discharging channel 10 at the bottom are guided to approach the lower discharging channel 10, a dehumidifying warm air channel 12 is arranged below a guide plate corresponding to an atomizing device 5, when the drying tank is used, dehumidifying warm air flow is introduced into the dehumidifying warm air channel 12, the particles positioned at the bottom of the drying chamber 2 are high in water content and heavy, the dehumidifying warm air flow blows the particles to approach the lower discharging channel 10 while floating up and down, and enters the secondary cyclone separator 14 from the lower discharging channel 10, and separation of the particles is completed.

The granule temperature that gets into second grade cyclone 14 from discharging channel 10 down is high, in order to avoid gluing the wall, the below of stock guide corresponds discharging channel 10 entrance down and is provided with dehumidification cold wind passageway 13, the granule is when getting into discharging channel 10 down, adopt dehumidification cold wind air current to cool down the processing to the granule, furthermore, dehumidification cold wind passageway 13 sets up towards discharging channel 10 entrance down, dehumidification cold wind air current gets into in second grade cyclone 14 and the one-level cyclone 15 through discharging channel 10 down, thereby play the effect to the cooling of cyclone.

The top of the drying chamber 2 is provided with a first spray head 16, the upper discharging channel 8 is internally provided with a second spray head 17, and the lower discharging channel 10 is internally provided with a third spray head 18 for cleaning different positions in the drying tank 1 to avoid dead angles.

To sum up, the multi-element hot air spray dryer disclosed by the application at least has the following advantages:

firstly, the undried materials are prevented from adhering to the inner wall; through setting up outer passageway 3, supply low velocity of flow time high temperature air current, form in high velocity of flow high temperature air current week side and be used for suppressing the air curtain that does not dry material circumference and fly off, reduce the diffusion radius of material drying process to greatly reduced material is not dry just with the probability of inner wall contact, realizes preventing the effect of adhering to the inner wall.

Secondly, the volume of the drying chamber is reduced; the material granule that the atomizing was sprayed distributes with normal distribution's mode in the drying chamber, and traditional desiccator, in order to avoid atomizing material not dry with the contact of drying chamber inner wall, increases the drying chamber radius many, and this application reduces the diffusion radius of material drying process through setting up outer passageway 3, reduces the drying chamber volume to below the fifth of traditional drying chamber volume.

Thirdly, the drying and granulating efficiency is greatly improved; the traditional drying device only adopts a pipeline to introduce hot air flow into the drying chamber, the temperature in the drying chamber is stable, for example, the temperature of the drying chamber is 70-150 ℃, particles can be completely dried in a longer time, the drying efficiency is very low, the drying mode applied by the drying device is two steps, the first step is that atomized particles are subjected to high-temperature treatment in an inner channel 4, the moisture on the surfaces of the particles is rapidly gasified, the second step is that the atomized particles are transferred to an outer channel 3 under the action of gas expansion, the water vapor in the particles is completely discharged by secondary high-temperature treatment, the particles are sufficiently dried, and the drying granulation efficiency is higher.

Fourthly, the quality of the dried and granulated product is high; the traditional mode, in order to improve drying efficiency, the condition that the drying temperature is forcibly improved can be realized, for example, the temperature of a drying chamber is 150-450 ℃, the temperature is too high at this moment, and for the powder with high content of saccharides or low-melting fat, the surface of the particle is easy to be coked or crusted to influence the product quality.

Fifthly, the drying degree is high, and a dehumidifying warm air channel 12 is arranged at the bottom of the drying chamber to carry out secondary drying on the particles.

Sixthly, hot particles are prevented from being attached to the cyclone separation equipment; a dehumidifying cold air channel 13 is arranged below the material guide plate corresponding to the inlet of the lower discharging channel 10, and particles with high humidity are cooled before entering the cyclone separation equipment, so that hot particles are effectively prevented from being attached to the cyclone separation equipment.

A multi-element hot air spray drying method comprises the following steps,

s1, forming internal parallel airflow in a drying working environment, wherein the direction of the internal parallel airflow is from top to bottom, and the cross section of the internal parallel airflow is circular;

s2, arranging one or more annular parallel air flows outside the periphery of the inner parallel air flow, wherein the annular parallel air flow is annular parallel air flow, the inner parallel air flow is coaxially arranged relative to the annular parallel air flow, the air flow directions of the annular parallel air flows are the same as those of the inner parallel air flow, the temperature of the inner parallel air flow is higher than that of the annular parallel air flow, the temperature of the annular parallel air flows is gradually increased from outside to inside, the flow velocity of the inner parallel air flow is higher than that of the annular parallel air flow, and the flow velocity of the annular parallel air flows is gradually increased from outside to inside;

and S3, balancing the gas flow in the inner side to atomize and spray the material.

The implementation principle of the multi-element hot air spray dryer in the embodiment of the application is as follows: after the atomized material is sprayed to the inner parallel airflow, because the temperature of the inner parallel airflow is far higher than the temperature of water boiling, the material absorbs heat quickly, the moisture on the surface of the particle is gasified quickly, the outer surface of the particle is dried instantly to the expected moisture content, the volume of the sprayed material expands rapidly along with the gasification of the moisture, the particle at the middle part is driven by the inner parallel airflow to be away from the spraying position quickly and enters the lower end of the inner parallel airflow, the temperature is lower than the spraying position, the particle is dried continuously at a second high temperature, the interior of the particle is further dried, the hardening or coking of the outer surface of the particle is avoided, the quality of the dried particle is ensured, the particle at the peripheral side enters the annular parallel airflow under the pushing of the expansion of the airflow, the interior of the particle is further dried in the annular parallel airflow, the hardening or coking of the outer surface of the particle is avoided, and the quality of the dried particle is ensured; in addition, in the process that the particles fall in the annular parallel airflow, the particles dried fully in the annular parallel airflow return to the inner parallel airflow under the action of pressure because the flow velocity of the inner parallel airflow is high, so that the temperature of the particles attached to the inner wall is avoided.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a many first hot-blast spray drier which characterized in that: including drying cylinder (1), set up drying chamber (2) in drying cylinder (1), be provided with on drying cylinder (1) be used for to outer passageway (3) of letting in low velocity of flow time high temperature air current in drying chamber (2), be provided with in outer passageway (3) be used for to interior passageway (4) of letting in high velocity of flow high temperature air current in drying chamber (2), in drying chamber (2) corresponding to the position department of interior passageway (4) installs atomizing device (5).

2. The multi-element hot air spray dryer according to claim 1, wherein: outer passageway (3) with interior passageway (4) are close to all be provided with in the one end of drying cylinder (1) and be used for becoming parallel air current's cowling panel (6) with the air current rectification.

3. The multiple hot air spray dryer according to claim 1 or 2, wherein: a partition plate (7) is arranged on one side of the atomizing device (5) in the drying chamber (2), an upper discharging channel (8) used for discharging is formed between the partition plate (7) and the inner wall of the drying chamber (2), and cyclone separation equipment connected with the upper discharging channel (8) is arranged on the side wall of the drying tank (1).

4. The multi-element hot air spray dryer according to claim 3, wherein: a partition plate (9) is installed in the upper discharging channel (8), a lower discharging channel (10) is formed between the partition plate (9) and the inner wall of the drying chamber (2), the height of an inlet of the lower discharging channel (10) is lower than that of the inlet of the upper discharging channel (8), and the cyclone separation equipment is connected with the lower discharging channel (10); the bottom of drying cylinder (1) is provided with perforated plate (11), perforated plate (11) below is provided with dehumidification warm braw passageway (12).

5. The multi-element hot air spray dryer according to claim 4, wherein: the height of one side of the porous plate (11) close to the inlet of the lower discharging channel (10) is lower than that of the other side.

6. The multi-element hot air spray dryer according to claim 5, wherein: and a dehumidifying and cold air channel (13) is arranged below the porous plate (11) corresponding to the inlet of the lower discharging channel (10).

7. The multi-element hot air spray dryer according to claim 4, wherein: the cyclone separation equipment comprises a secondary cyclone separator (14) and a primary cyclone separator (15) connected to an upper connector of the secondary cyclone separator (14), a feed inlet of the primary cyclone separator (15) is communicated with the upper discharge channel (8), and the secondary cyclone separator (14) is communicated with the lower discharge channel (10).

8. The multi-element hot air spray dryer according to claim 4, wherein: a first spray head (16) is installed at the top of the drying chamber (2), a second spray head (17) is installed in the upper discharging channel (8), and a third spray head (18) is installed in the lower discharging channel (10).

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