Spray drying device

Abstract

The utility model belongs to the technical field of drying devices, and particularly relates to a spray drying device which comprises a spray drying tower, the spray drying tower comprises an upper barrel and a lower cone, a feeding unit is arranged at the top of the barrel, a hot air unit is arranged on the side wall of the barrel, and an air conveying cooling unit is arranged on the side wall of the cone. An automatic packaging unit is arranged at the bottom of the air conveying cooling unit, the hot air unit comprises a hot air conveying pipeline, one end of the hot air conveying pipeline is connected with the upper portion of the side wall of the barrel, and a steam heat exchanger is arranged in the hot air conveying pipeline. The output end of the first-stage rotary dehumidifier is connected with a first-stage air supply pipe, and the output end of the second-stage rotary dehumidifier is connected with a second-stage air supply pipe. According to the device, the to-be-dried feed liquid can be quickly dried, the to-be-dried feed liquid is prevented from being adhered to the inner wall of the drying tower, meanwhile, dust emission is reduced, and dust pollution is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to drying device technical field, concretely relates to a spray drying device. BACKGROUND

[0002] In the production field of food raw materials, malt dextrin, resistant dextrin, creamer and functional sugar substances such as fructo-oligosaccharide, isomalto-oligosaccharide and polydextrose are widely used. Malt dextrin is produced by using starch as raw material, precisely controlling the degree of hydrolysis by enzyme process, and then going through processes such as purification and drying. Resistant dextrin is obtained by specific heating and enzyme treatment of starch to promote polymerization of starch molecules, and then purification and drying. The production process of creamer, as a kind of composite food additive, also involves drying of the mixture. Fructo-oligosaccharide, isomalto-oligosaccharide and polydextrose are usually in a solution or a state with certain humidity before drying. Before drying, they are all in the form of slurry or paste containing a large amount of water. This high-moisture state makes them extremely vulnerable to microbial attack, which in turn leads to deterioration, mold and spoilage, and other adverse phenomena, seriously affecting product quality and safety. Therefore, in the entire production process, the spray drying process plays an indispensable key role in ensuring product quality.

[0003] However, there are many difficulties in spray drying these substances. Malt dextrin and resistant dextrin have certain stickiness, which easily adheres to the inner wall of the drying tower during the spray drying process, not only reducing the drying efficiency, but also causing the wall-stuck part to become scorched, seriously damaging the product quality. For creamer, its complex composition can cause uneven drying distribution during spray drying, affecting the taste and stability of the product. Fructo-oligosaccharide and isomalto-oligosaccharide are heat-sensitive, and their physiological activity is easily destroyed if the high-temperature time is too long during spray drying. Polydextrose also undergoes degradation reaction due to high temperature during spray drying, changing its physical and chemical properties. In addition, malt dextrin, resistant dextrin and other powders after drying are prone to dust during collection and transportation, causing dust pollution and adversely affecting the environment of the workplace. SUMMARY

[0004] The utility model aims at providing a spray drying device, which can quickly dry the material liquid to be dried, prevent the material liquid to be dried from sticking to the inner wall of the drying tower, control the moisture content of the material, make the dried material flow well without caking, dissolve quickly in water, and reduce dust emission and dust pollution.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The spray drying device comprises a spray drying tower, the spray drying tower comprises an upper cylinder and a lower cone, the top of the cylinder is provided with a feeding unit, the sidewall of the cylinder is provided with a hot air unit, the sidewall of the cone is provided with a wind delivery and cooling unit, and the bottom of the wind delivery and cooling unit is provided with an automatic packaging unit.

[0007] The hot air unit comprises a hot air conveying pipeline, one end of the hot air conveying pipeline is connected to the upper portion of the sidewall of the cylinder, and a steam heat exchanger is arranged in the hot air conveying pipeline.

[0008] The wind delivery and cooling unit comprises a first rotary dehumidifier and a second rotary dehumidifier, the output end of the first rotary dehumidifier is connected with a first air supply pipe, one end of the first air supply pipe away from the first rotary dehumidifier is connected with a first cyclone separator, the output end of the second rotary dehumidifier is connected with a second air supply pipe, one end of the second air supply pipe away from the second rotary dehumidifier is connected with a second cyclone separator, the bottom of the first air supply pipe is connected with the bottom of the second air supply pipe, and the bottom of the first cyclone separator is connected with the second air supply pipe.

[0009] Among them:

[0010] One end of the hot air conveying pipeline away from the cylinder is connected with an air equalization chamber, one end of the air equalization chamber away from the hot air conveying pipeline is connected with a blower, and one end of the blower away from the air equalization chamber is connected with a sub-high-efficiency air filter.

[0011] The top end of the first cyclone separator is provided with a first exhaust pipe, one end of the first exhaust pipe away from the first cyclone separator is connected with the sidewall of the cone away from the hot air conveying pipeline, the top end of the second cyclone separator is connected with a second exhaust pipe, one end of the second exhaust pipe away from the second cyclone separator is connected with the sidewall of the cone away from the hot air conveying pipeline, an air induction machine two is arranged on the first exhaust pipe, and an air induction machine three is arranged on the second exhaust pipe.

[0012] The sidewall of the cylinder close to the hot air conveying pipeline is connected with a cyclone separator at the lower portion, the top of the cyclone separator is connected with an air induction machine one, the output end of the air induction machine one is connected with a hot air discharge pipeline one, the top end of the hot air discharge pipeline one is connected with the bottom end of the air equalization chamber, the top end of the air equalization chamber is connected with a hot air discharge pipeline two, the top end of the hot air discharge pipeline two is connected with a water film dust collector, and the bottom of the cyclone separator is connected with the sidewall of the cone.

[0013] The automatic packaging unit comprises an aging bin, the top end of the aging bin is connected with the bottom end of the second cyclone separator, the bottom end of the aging bin is connected with a screening machine, the bottom end of the screening machine is connected with a packaging machine stock bin, and the bottom end of the packaging machine stock bin is connected with an automatic packaging machine.

[0014] The feeding unit comprises a feeding tank, the bottom of the feeding tank is connected with a feeding pump, the output end of the feeding pump is connected with a high-pressure pump group, the output end of the high-pressure pump group is connected with the top end of the cylinder, and a water inlet pipe and a water outlet pipe are arranged on the feeding pump in a matched mode.

[0015] The water film dust collector comprises a primary dust collector, the top of which is connected to a secondary dust collector, a circulation pipe is provided on one side of the primary dust collector, and a dust collector circulation pump is provided on the circulation pipe.

[0016] A wastewater discharge pipe is provided at the bottom of the side wall of the hot air discharge pipe away from the induced draft fan. A spray head is provided inside the hot air discharge pipe. The bottom of the spray head is connected to a water supply pipe, which runs through one side wall of the hot air discharge pipe.

[0017] The high-pressure pump group includes high-pressure pump 1 and high-pressure pump 2. The output end of high-pressure pump 1 and the output end of high-pressure pump 2 are commonly connected to the top of the spray drying tower, and the input end of high-pressure pump 1 and the input end of high-pressure pump 2 are commonly connected to the output end of the feed pump.

[0018] The air equalizing chamber and the cyclone separator are provided with an insulation layer with a thickness of 200 mm and made of aluminum silicate wool; the hot air conveying pipeline is provided with an insulation layer with a thickness of 50 mm and made of aluminum silicate wool; the spray drying tower is provided with an insulation layer with a thickness of 100 mm and made of aluminum silicate wool.

[0019] The beneficial effects of the utility model are:

[0020] By setting up a spray drying tower, a feeding unit and a hot air unit, the liquid to be dried can be dried quickly and prevented from sticking to the inner wall of the spray drying tower; by setting up an air supply and cooling unit, the dried material is always in a ventilated state during the discharge process, preventing the dried material from absorbing moisture in the air during discharge, while reducing dust emissions and dust pollution; by setting up an automatic packaging unit, the dried material is automatically sealed and packaged to avoid external environmental pollution and improve product quality and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0023] In the picture:

[0024] 1. Spray drying tower; 2. Feed tank; 3. Feed pump; 4. High-pressure pump group; 401. High-pressure pump 1; 402. High-pressure pump 2; 5. Sub-high-efficiency air filter; 6. Blower; 7. Air distribution chamber; 8. Hot air delivery pipeline; 9. Steam heat exchanger; 10. Cyclone separator; 11. Induced draft fan 1; 12. Hot air discharge pipeline 1; 13. Hot air discharge pipeline 2; 14. Water film dust collector; 1401. Primary dust collector; 140 2. Secondary dust collector; 1403. Dust collector circulation pump; 15. Primary rotary dehumidifier; 16. Secondary rotary dehumidifier; 17. Primary air supply duct; 18. Primary cyclone separator; 19. Primary exhaust duct; 20. Secondary air supply duct; 21. Secondary cyclone separator; 22. Secondary exhaust duct; 23. Secondary induced draft fan; 24. Third induced draft fan; 25. Aging bin; 26. Screening machine; 27. Packaging machine silo; 28. Automatic packaging machine. DETAILED DESCRIPTION

[0025] The present invention will be described and illustrated in detail below with reference to the embodiments.

[0026] Example 1

[0027] like Figures 1-2 As shown, the spray drying device of the present invention comprises a spray drying tower 1, which comprises an upper cylinder and a lower cone. A feeding unit is provided on the top of the cylinder, a hot air unit is provided on the side wall of the cylinder, an air supply and cooling unit is provided on the side wall of the cone, and an automatic packaging unit is provided at the bottom of the air supply and cooling unit.

[0028] The hot air unit includes a hot air delivery pipeline 8, one end of which is connected to the upper part of the side wall of the cylinder, and a steam heat exchanger 9 is provided in the hot air delivery pipeline 8;

[0029] The air supply cooling unit includes a first-stage rotary dehumidifier 15 and a second-stage rotary dehumidifier 16. The output end of the first-stage rotary dehumidifier 15 is connected to a first-stage air supply pipe 17, and the end of the first-stage air supply pipe 17 away from the first-stage rotary dehumidifier 15 is connected to a first-stage cyclone separator 18. The output end of the second-stage rotary dehumidifier 16 is connected to a second-stage air supply pipe 20, and the end of the second-stage air supply pipe 20 away from the second-stage rotary dehumidifier 16 is connected to a second-stage cyclone separator 21. The bottom of the cone is connected to the first-stage air supply pipe 17, and the bottom of the first-stage cyclone separator 18 is connected to the second-stage air supply pipe 20.

[0030] The end of the hot air conveying pipeline 8 away from the cylinder is connected to the air distribution chamber 7, the end of the air distribution chamber 7 away from the hot air conveying pipeline 8 is connected to the blower 6, and the end of the blower 6 away from the air distribution chamber 7 is connected to the sub-high efficiency air filter 5.

[0031] A first-stage exhaust duct 19 is provided at the top of the first-stage cyclone separator 18, and the end of the first-stage exhaust duct 19 away from the first-stage cyclone separator 18 is connected to the side wall of the cone away from the hot air conveying pipeline 8. A second-stage exhaust duct 22 is connected to the top of the second-stage cyclone separator 21, and the end of the second-stage exhaust duct 22 away from the second-stage cyclone separator 21 is connected to the side wall of the cone away from the hot air conveying pipeline 8. An induced draft fan 23 is provided on the first-stage exhaust duct 19, and an induced draft fan 3 24 is provided on the second-stage exhaust duct 22.

[0032] A cyclone separator 10 is connected to the lower part of the side wall of the cylinder near the hot air conveying pipeline 8, and an induced draft fan 11 is connected to the top of the cyclone separator 10. The output end of the induced draft fan 11 is connected to a hot air exhaust pipeline 12, and the top of the hot air exhaust pipeline 12 is connected to the bottom of the air balancing chamber 7. The top of the air balancing chamber 7 is connected to a hot air exhaust pipeline 2 13, and the top of the hot air exhaust pipeline 2 13 is connected to a water film dust collector 14. The bottom of the cyclone separator 10 is connected to the side wall of the cone.

[0033] The automatic packaging unit includes an aging bin 25, the top of which is connected to the bottom of the secondary cyclone separator 21, the bottom of which is connected to a screening machine 26, the bottom of which is connected to a packaging machine silo 27, and the bottom of which is connected to an automatic packaging machine 28.

[0034] The feeding unit includes a feeding tank 2, the bottom of the feeding tank 2 is connected to a feeding pump 3, the output end of the feeding pump 3 is connected to a high-pressure pump group 4, the output end of the high-pressure pump group 4 is connected to the top of the cylinder, and the feeding pump 3 is equipped with a water inlet pipe and a water outlet pipe.

[0035] The water film dust collector 14 includes a primary dust collector 1401 , the top of which is connected to a secondary dust collector 1402 . A circulation pipe is provided on one side of the primary dust collector 1401 , and a dust collector circulation pump 1403 is provided on the circulation pipe.

[0036] A wastewater discharge pipe is provided at the bottom of the side wall of the hot air discharge pipe 12 away from the induced draft fan 11. A spray head is provided inside the hot air discharge pipe 12. The bottom of the spray head is connected to a water supply pipe, which runs through the side wall of the hot air discharge pipe 12.

[0037] The high-pressure pump group 4 includes a high-pressure pump 1 401 and a high-pressure pump 2 402. The output end of the high-pressure pump 1 401 and the output end of the high-pressure pump 2 402 are commonly connected to the top of the spray drying tower 1, and the input end of the high-pressure pump 1 401 and the input end of the high-pressure pump 2 402 are commonly connected to the output end of the feed pump 3.

[0038] The heat preservation layer is arranged on the uniform air chamber 7 and the cyclone separator 10, the thickness of the heat preservation layer is 200 mm, and the material of the heat preservation layer is aluminum silicate cotton; the heat insulation layer is arranged on the hot air conveying pipeline 8, the thickness of the heat insulation layer is 50 mm, and the material of the heat insulation layer is aluminum silicate cotton; and the heat insulation layer is arranged on the spray drying tower 1, the thickness of the heat insulation layer is 100 mm, and the material of the heat insulation layer is aluminum silicate cotton.

[0039] Operation process and principle:

[0040] I. Hot air supply

[0041] The air is filtered by the sub-high efficiency air filter 5 first, and then is sent into the hot air conveying pipeline 8 by the air blower 6 after impurities are removed; in the hot air conveying pipeline 8, the air is heated by the steam heat exchanger 9, and the hot air enters the inside of the spray drying tower 1 from the top of the side wall of the cylinder.

[0042] II. Spray drying

[0043] The to-be-dried liquid is stored in the feed tank 2, is pumped out by the feed pump 3, is pressurized by the high-pressure pump set 4, and is then conveyed to the top of the spray drying tower 1.

[0044] The to-be-dried liquid entering the top of the spray drying tower 1 is atomized and dispersed into fine droplets, the droplets are fully mixed and contacted with the hot air in the inside of the spray drying tower 1, the water in the droplets evaporates due to the high temperature of the hot air, and the to-be-dried liquid is dried into fine solid material.

[0045] III. Air conveying and cooling

[0046] Most of the dried solid material is discharged from the bottom of the spray drying tower 1 into the primary air conveying pipe 17, the air output by the primary rotary dehumidifier 15 carries the dried solid material into the primary cyclone separator 18 through the primary air conveying pipe 17, the separated solid material is discharged from the bottom of the primary cyclone separator 18 into the secondary air conveying pipe 20, air conveying and cooling of the dried solid material are realized, and the separated gas is sent into the spray drying tower 1 through the primary air exhaust pipe 19.

[0047] The solid material after air conveying and cooling is discharged from the bottom of the primary cyclone separator 18 into the secondary air conveying pipe 20, the solid material is further air conveyed and cooled, the air output by the secondary rotary dehumidifier 16 carries the solid material after air conveying and cooling into the secondary cyclone separator 21 through the secondary air conveying pipe 20, the separated solid material is discharged from the bottom of the secondary cyclone separator 21 into the aging bin 25, and the separated gas is sent into the spray drying tower 1 through the secondary air exhaust pipe 22.

[0048] IV. Automatic packaging

[0049] The solid material cooled by the air flow enters the aging bin 25, and after a certain time of storage in the aging bin 25, the solid material falls into the screening machine 26 to remove unqualified large particles or impurities, and then enters the packaging machine bin 27 to be automatically packaged by the automatic packaging machine 28.

[0050] V. Gas exhaust

[0051] The hot air, the gas discharged by the first exhaust pipe 19, the gas discharged by the second exhaust pipe 22, and the small amount of dried solid material enter the cyclone separator 10, and two phases are separated in the cyclone separator 10. The separated solid material settles at the bottom of the cyclone separator 10 and is returned to the spray drying tower 1. The separated gas is sent to the hot air exhaust pipeline I 12 by the induced draft fan I 11. The gas is cooled in the hot air exhaust pipeline I 12. The cooled gas enters the water film dust collector 14 through the air distribution chamber 7 and the hot air exhaust pipeline II 13 in turn. The water film dust collector 14 further captures the escaped fine particles in the cooled gas, and finally exhausts.

Claims

1. A spray drying apparatus comprising a spray drying tower (1) comprising an upper cylindrical section and a lower conical section, characterized in that, The top of the cylinder is provided with a feeding unit, the side wall of the cylinder is provided with a hot air unit, the side wall of the cone is provided with a wind delivery and cooling unit, and the bottom of the wind delivery and cooling unit is provided with an automatic packaging unit. The hot air unit comprises a hot air conveying pipeline (8), one end of the hot air conveying pipeline (8) is connected to the upper part of the side wall of the cylinder, and a steam heat exchanger (9) is arranged in the hot air conveying pipeline (8). The wind delivery and cooling unit comprises a first-stage rotary drum dehumidifier (15) and a second-stage rotary drum dehumidifier (16), the output end of the first-stage rotary drum dehumidifier (15) is connected to a first-stage air supply pipe (17), one end of the first-stage air supply pipe (17) away from the first-stage rotary drum dehumidifier (15) is connected to a first-stage cyclone separator (18), the output end of the second-stage rotary drum dehumidifier (16) is connected to a second-stage air supply pipe (20), one end of the second-stage air supply pipe (20) away from the second-stage rotary drum dehumidifier (16) is connected to a second-stage cyclone separator (21), the bottom of the first-stage cyclone separator (18) is connected to the first-stage air supply pipe (17), and the bottom of the second-stage air supply pipe (20) is connected to the second-stage cyclone separator (21).

2. The spray drying apparatus of claim 1, wherein, One end of the hot air conveying pipeline (8) away from the cylinder is connected to an air uniformizing chamber (7), one end of the air uniformizing chamber (7) away from the hot air conveying pipeline (8) is connected to a blower (6), and one end of the blower (6) away from the air uniformizing chamber (7) is connected to a sub-high-efficiency air filter (5).

3. The spray drying apparatus of claim 1, wherein, The top end of the first-stage cyclone separator (18) is provided with a first-stage air exhaust pipe (19), one end of the first-stage air exhaust pipe (19) away from the first-stage cyclone separator (18) is connected to the side wall of the cone away from the hot air conveying pipeline (8), the top end of the second-stage cyclone separator (21) is connected to a second-stage air exhaust pipe (22), one end of the second-stage air exhaust pipe (22) away from the second-stage cyclone separator (21) is connected to the side wall of the cone away from the hot air conveying pipeline (8), an air inducer two (23) is arranged on the first-stage air exhaust pipe (19), and an air inducer three (24) is arranged on the second-stage air exhaust pipe (22).

4. The spray drying apparatus of claim 2, wherein, The side wall of the cylinder close to the hot air conveying pipeline (8) is connected to a cyclone separator (10) at the lower part, the top of the cyclone separator (10) is connected to an air inducer one (11), the output end of the air inducer one (11) is connected to a hot air exhaust pipeline one (12), the top end of the hot air exhaust pipeline one (12) is connected to the bottom end of the air uniformizing chamber (7), the top end of the air uniformizing chamber (7) is connected to a hot air exhaust pipeline two (13), the top end of the hot air exhaust pipeline two (13) is connected to a water film dust collector (14), and the bottom of the cyclone separator (10) is connected to the side wall of the cone.

5. The spray drying apparatus of claim 1, wherein, The automatic packaging unit comprises an aging bin (25), the top end of the aging bin (25) is connected to the bottom end of the second-stage cyclone separator (21), the bottom end of the aging bin (25) is connected to a screening machine (26), the bottom end of the screening machine (26) is connected to a packaging machine bin (27), and the bottom end of the packaging machine bin (27) is connected to an automatic packaging machine (28).

6. The spray drying apparatus of claim 1, wherein, The feeding unit comprises a feeding tank (2), the bottom of the feeding tank (2) is connected to a feeding pump (3), the output end of the feeding pump (3) is connected to a high-pressure pump group (4), the output end of the high-pressure pump group (4) is connected to the top end of the cylinder, and a water inlet pipe and a water outlet pipe are arranged on the feeding pump (3) in a matched mode.

7. The spray drying apparatus of claim 4, wherein, The water film dust collector (14) comprises a first-stage dust collector (1401), a second-stage dust collector (1402) connected to the top end of the first-stage dust collector (1401), and a circulating pipeline arranged on one side of the first-stage dust collector (1401), wherein a dust collector circulating pump (1403) is arranged on the circulating pipeline.

8. The spray drying apparatus of claim 4, wherein, The side wall bottom of the hot air exhaust pipeline one (12) is provided with a waste water exhaust pipeline, and the inside of the hot air exhaust pipeline one (12) is provided with a spray head, and the bottom of the spray head is connected with a water supply pipeline which penetrates through the side wall of the hot air exhaust pipeline one (12).

9. The spray drying apparatus of claim 6, wherein, The high-pressure pump group (4) comprises a high-pressure pump one (401) and a high-pressure pump two (402), and the output ends of the high-pressure pump one (401) and the high-pressure pump two (402) are connected to the top end of the spray drying tower (1), and the input ends of the high-pressure pump one (401) and the high-pressure pump two (402) are connected to the output end of the feed pump (3).

10. The spray drying apparatus of claim 4, wherein, The uniform air chamber (7) and the cyclone separator (10) are provided with a heat preservation layer, the thickness of the heat preservation layer is 200mm, and the material of the heat preservation layer is aluminum silicate cotton; the hot air conveying pipeline (8) is provided with a heat insulation layer, the thickness of the heat insulation layer is 50mm, and the material of the heat insulation layer is aluminum silicate cotton; the spray drying tower (1) is provided with an insulating layer, the thickness of the insulating layer is 100mm, and the material of the insulating layer is aluminum silicate cotton.

Images