CN115253329A - Pressure spray drying equipment and feed liquid drying method thereof - Google Patents
Pressure spray drying equipment and feed liquid drying method thereof Download PDFInfo
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- CN115253329A CN115253329A CN202210769080.1A CN202210769080A CN115253329A CN 115253329 A CN115253329 A CN 115253329A CN 202210769080 A CN202210769080 A CN 202210769080A CN 115253329 A CN115253329 A CN 115253329A
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- 238000001694 spray drying Methods 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000001035 drying Methods 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 86
- 239000002912 waste gas Substances 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000010419 fine particle Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims description 34
- 238000007664 blowing Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 22
- 238000004064 recycling Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 10
- 239000011344 liquid material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007791 dehumidification Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- -1 and meanwhile Substances 0.000 claims description 3
- 238000009688 liquid atomisation Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000008187 granular material Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000008235 industrial water Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses pressure spray drying equipment which comprises a feed liquid atomizing device, a hot air generating device, a spray drying tower, a material receiving device and a gas-solid separating device. The invention also discloses a feed liquid drying method based on the pressure spray drying equipment. According to the invention, the material receiving device is arranged at the bottom of the spray drying tower, and the gas-solid separation device is arranged at the upper end of the spray drying tower, so that the working mode of collecting powder or fine particle finished products in an up-exhaust and down-exhaust manner is realized, the waste gas and the finished products move in opposite directions in the spray drying tower, the waste gas and the finished products can be rapidly separated, the mixing between the waste gas and the finished products is reduced, the mutual interference between the waste gas and the finished products is avoided, the complete separation between the waste gas and the finished products is facilitated, and the production efficiency is improved.
Description
Technical Field
The invention relates to pressure spray drying equipment, in particular to pressure spray drying equipment and a feed liquid drying method thereof.
Background
The pressure spray dryer is a device which can simultaneously complete drying and granulation. During the production process, the finished granules are obtained, and simultaneously, exhaust gas with tiny powder is generated. In current pressure spray dryer, the granule finished product is collected from pressure spray dryer bottom, and simultaneously, the waste gas of taking the tiny powder also collects the processing from the bottom, then inside pressure spray dryer, the moving direction of granule finished product and the waste gas of taking the tiny powder is all downward, can have the interference each other, the condition of intermixing appears even, for example waste gas is along with the granule finished product is collected, the granule finished product is a small amount along with waste gas collection processing, lead to both to separate thoroughly, produce very big influence to production efficiency.
Disclosure of Invention
In view of the above disadvantages, an object of the present invention is to provide a pressure spray drying apparatus and a feed liquid drying method thereof, which can achieve a working mode of collecting powder or fine particle products in an upward-exhaust and downward-exhaust manner, and facilitate movement of exhaust gas and the finished product in opposite directions in a spray drying tower, thereby facilitating rapid separation of the exhaust gas and the finished product, reducing mixing between the exhaust gas and the finished product, avoiding interference between the exhaust gas and the finished product, facilitating thorough separation of the exhaust gas and the finished product, and improving production efficiency.
The technical scheme adopted by the invention to achieve the aim is as follows:
a pressure spray drying apparatus, comprising:
a feed liquid atomizing device for atomizing the feed liquid into mist-shaped liquid drops;
the hot air generating device is used for heating air to generate hot air;
a spray drying tower which is respectively connected with the feed liquid atomization device and the hot air generation device and is used for fully contacting the atomized liquid drops with the hot air to rapidly complete the drying process to obtain powder or fine particle finished products;
the material receiving device is arranged at the bottom of the spray drying tower and is used for collecting powder or fine particle finished products;
and the gas-solid separation device is connected to the upper end of the spray drying tower and is used for separating the waste gas and the powder.
As a further improvement of the present invention, the feed liquid atomizing device comprises a pressure type atomizer connected to the spray drying tower, and a feed pipe connected to the head end of the pressure type atomizer, wherein a water inlet valve, a feed valve, a pneumatic pump electromagnetic valve and a high pressure pump are sequentially arranged from the head end to the tail end of the feed pipe, and the tail end of the feed pipe is connected to the pressure type atomizer.
As a further improvement of the present invention, the hot air generating device includes an air inlet dehumidifier, a first steam heat exchanger, a first air inlet duct connected between the air inlet dehumidifier and the first steam heat exchanger, a blower arranged on the first air inlet duct, and a first hot air duct connected between the first steam heat exchanger and the upper end of the spray drying tower.
As a further improvement of the present invention, the hot air generating apparatus further comprises a second steam heat exchanger, a hot air blower disposed at the head end of the second steam heat exchanger, a second air inlet duct connected between the first air inlet duct and the hot air blower, and a second hot air duct connected to the second steam heat exchanger and the lower portion of the spray drying tower.
As a further improvement of the invention, the gas-solid separation device comprises a cyclone separator, the upper end of the cyclone separator is provided with an air inlet and an air outlet, the lower end of the cyclone separator is provided with a powder outlet, the air inlet is connected with the upper end of the spray drying tower through an air inlet pipeline, and the lower end of the powder outlet is provided with a powder recovery bin.
As a further improvement of the invention, the powder recycling device further comprises a powder recycling device connected to the powder recycling bin, wherein the powder recycling device comprises a third steam heat exchanger, a blowing hot air pipeline connected between the powder recycling bin and the third steam heat exchanger, and a powder return pipeline connected between the powder recycling bin and the upper end of the spray drying tower, wherein a blowing steam pipeline and a blowing air pipeline are arranged at the head end of the third steam heat exchanger, a blowing adjusting valve is arranged on the blowing steam pipeline, and a blowing fan and an air filter are arranged on the blowing air pipeline.
As a further improvement of the invention, the waste gas dust removal device also comprises a waste gas dust removal device connected with the exhaust port, the waste gas dust removal device comprises a primary waste gas dust removal mechanism and a secondary waste gas dust removal mechanism which are connected with each other, the primary waste gas dust removal mechanism comprises a primary spray dust remover and a waste gas pipeline connected between the primary spray dust remover and the exhaust port, and an exhaust fan is arranged on the waste gas pipeline; the secondary waste gas dust removal mechanism comprises a secondary spray dust remover connected with a primary spray dust remover.
As a further improvement of the invention, the material receiving device comprises a material receiving pipeline connected to the bottom of the spray drying tower, the head end of the material receiving pipeline is connected with a cold air dehumidifier, the tail end of the material receiving pipeline is connected with a material receiving bin, the material receiving bin is connected with a material receiving fan, a tower air-lock valve is arranged on the material receiving pipeline and between the cold air dehumidifier and the spray drying tower, and at least one material receiving air-lock valve is arranged on the material receiving bin.
The feed liquid drying method based on the pressure spray drying equipment is characterized by comprising the following steps of:
(1) The liquid material is sent into a pressure type atomizer from a feed pipeline at the high pressure of 10-20MPa, the liquid material is atomized into small droplets by the pressure type atomizer and is conveyed to a spray drying tower;
(2) The air with steam enters an air inlet dehumidifier for dehumidification, the dehumidified air enters a first steam heat exchanger from a first air inlet pipeline, the first steam heat exchanger heats the air to hot air with the temperature of 150-200 ℃, and then the hot air is conveyed to a spray drying tower;
(3) The small drops entering the spray drying tower are fully contacted with hot air, the drying process is rapidly completed, the obtained powder or fine particle finished product moves downwards and receives materials, and meanwhile, waste gas with the temperature of 80-100 ℃ is upwards discharged.
Wherein, the step (1) and the step (2) have no sequence;
(4) The waste gas discharged upwards is provided with micro powder and enters a cyclone separator, the cyclone separator is used for separating the waste gas from the powder, and finally the waste gas is discharged and the powder is collected;
(5) And heating the air to 60-100 ℃ by a third steam heat exchanger of the powder recycling device, blowing air into the powder recycling bin, and blowing the powder back to the spray drying tower for secondary drying treatment.
As a further improvement of the invention, the side wall pipeline of the feeding pipe in the step (1) is connected with a liquid pressurizer with a pressure display
The beneficial effects of the invention are as follows: through setting up material collecting device in spray drying tower bottom, and set up gas-solid separator in spray drying tower upper end, realize collecting powder or the off-the-shelf working method of tiny granule under the last exhaust, do benefit to waste gas and finished product and remove with opposite direction in spray drying tower to do benefit to separation that both can be quick, reduce the mixture between the two, mutual noninterference does benefit to both and thoroughly separates, improves production efficiency.
The above is an overview of the technical solutions of the present invention, and the present invention is further described below with reference to the accompanying drawings and the detailed description thereof.
Drawings
Fig. 1 is a block diagram of the overall structure of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purposes, the following detailed description of the embodiments of the present invention is provided with the accompanying drawings and the preferred embodiments.
Referring to fig. 1, an embodiment of the present invention provides a pressure spray drying apparatus, including:
a feed liquid atomizing device 1 for atomizing the feed liquid into mist-like droplets;
a hot air generating device 2 for heating air to generate hot air;
a spray drying tower 3 connected to the feed liquid atomizing device 1 and the hot air generating device 2, respectively, for fully contacting the atomized liquid droplets with the hot air to rapidly complete the drying process, thereby obtaining a finished product of powder or fine particles;
and the material receiving device 4 is arranged at the bottom of the spray drying tower 3 and is used for collecting powder or fine particle finished products.
And a gas-solid separation device 5 connected to the upper end of the spray drying tower 3 for separating the waste gas and the powder.
Through setting up material collecting device 4 in spray drying tower 3 bottoms, and set up gas-solid separator 5 in spray drying tower 3 upper ends, realize collecting powder or the off-the-shelf working method of tiny granule under the last exhaust, do benefit to waste gas and finished product and remove with opposite direction in spray drying tower 3 to do benefit to separation that both can be quick, reduce the mixture between the two, mutual noninterference does benefit to both and thoroughly separates, improves production efficiency.
In this embodiment, the feed liquid atomizing apparatus 1 includes a pressure type atomizer 11 connected to the spray drying tower 3, and a feeding pipe 12 connected to the head end of the pressure type atomizer 11, a water inlet valve 13, a feeding valve 14, a pneumatic pump electromagnetic valve 15 and a high pressure pump 16 are sequentially disposed from the head end to the tail end of the feeding pipe 12, and the tail end of the feeding pipe 12 is connected to the pressure type atomizer 11. The feeding valve 14 and the water inlet valve 13 respectively control the material and the industrial water to enter from the feeding pipeline 12, the pneumatic pump electromagnetic valve 15 and the high-pressure pump 16 control the feeding pressure, the material and the industrial water are mixed into the feed liquid and enter the pressure type atomizer 11 at high pressure, and then the feed liquid is atomized into mist-shaped small liquid drops by the pressure type atomizer 11, so that the feed liquid enters the spray drying tower 3 for drying treatment in the mist-shaped small liquid drops. Through reasonable control feeding pressure, be favorable to that the feed liquid can be fast, smooth and easy and stable feeding, be favorable to improving feed liquid whole drying efficiency.
In this embodiment, the hot air generating device 2 includes an air inlet dehumidifier 21, a first steam heat exchanger 22, a first air inlet duct 23 connected between the air inlet dehumidifier 21 and the first steam heat exchanger 22, a blower 24 disposed on the first air inlet duct 23, and a first hot air duct 25 connected between the first steam heat exchanger 22 and the upper end of the spray drying tower 3. The air with steam enters the air inlet dehumidifier 21 for dehumidification, and under the conveying power provided by the blower 24, the dehumidified air is sucked into the first steam heat exchanger 22 from the first air inlet pipeline 23, and the air is heated into hot air by the first steam heat exchanger 22 and then conveyed to the spray drying tower 3. The hot air generating device 2 can heat the air fully, uniformly and efficiently, and is favorable for providing stable hot air with a certain temperature for the spray drying tower 3.
In this embodiment, the hot air generating device 2 further includes a second steam heat exchanger 26, a hot air blower 27 disposed at the head end of the second steam heat exchanger 26, a second air inlet duct 28 connected between the first air inlet duct 23 and the hot air blower 27, and a second hot air duct 29 connected to the second steam heat exchanger 26 and the lower portion of the spray drying tower 3. When the vaporific liquid drop that gets into spray drying tower 3 fully contacts with the hot-air, accomplish drying process rapidly, obtain powder or tiny particle finished product after, for powder or tiny particle can be smooth move down the collection, this embodiment adopts the hot-air to provide power, blows powder or tiny particle down for powder or tiny particle can be quick drop down, be convenient for receive the material and handle.
In this embodiment, the gas-solid separation device 5 comprises a cyclone separator 51, the cyclone separator 51 has an air inlet 52 and an air outlet 53 at the upper end thereof, and a powder outlet 54 at the lower end thereof, the air inlet 52 is connected with the upper end of the spray drying tower 3 through an air inlet pipe 55, and a powder recovery bin 56 is disposed at the lower end of the powder outlet 54. After the feed liquid is dried in the spray drying tower 3, the generated waste gas has the fine powder, the cyclone separator 51 separates the waste gas from the fine powder, and then the waste gas is discharged upwards, and the fine powder drops downwards for recycling, so that the waste gas and the fine powder are quickly separated, the waste gas is discharged, and the fine powder is recycled. The mode of collecting the tiny powder under the adoption is discharged from the top, does benefit to waste gas and can abundant quick separation of tiny powder, raises the efficiency.
In order to recycle the fine powder processed by the gas-solid separation device 5 and reduce the waste of resources, the pressure spray drying apparatus of this embodiment further includes a powder recycling device 6 connected to the powder recycling bin 56, where the powder recycling device 6 includes a third steam heat exchanger 61, a blowing hot air pipeline 62 connected between the powder recycling bin 56 and the third steam heat exchanger 61, and a powder return pipeline 63 connected between the powder recycling bin 56 and the upper end of the spray drying tower 3, where a blowing steam pipeline 611 and a blowing air pipeline 612 are provided at the head end of the third steam heat exchanger 61, a blowing adjusting valve 613 is provided on the blowing steam pipeline 611, and a blowing fan 614 and an air filter 615 are provided on the blowing air pipeline 612. Under the conveying power provided by the blowing fan 614, the air with steam is sucked into the third steam heat exchanger 61, the air is heated into hot air by the third steam heat exchanger 61, the hot air is blown into the powder recovery bin 56, the tiny powder in the powder recovery bin 56 is blown back to the spray drying tower 3 from the powder return pipeline 63 for drying treatment again, and therefore the tiny powder is recycled, and the waste of resources is reduced.
In order to meet the environmental protection requirement when the exhaust gas is discharged, the pressure spray drying equipment of the embodiment further comprises an exhaust gas dust removal device 7 connected to the exhaust port 53, the waste dust removal device 7 comprises a primary exhaust gas dust removal mechanism 71 and a secondary exhaust gas dust removal mechanism 72 which are connected with each other, the primary exhaust gas dust removal mechanism 71 comprises a primary spray dust remover 711 and an exhaust gas pipeline 712 connected between the primary spray dust remover 711 and the exhaust port 53, and an exhaust fan 713 is arranged on the exhaust gas pipeline 712; the secondary exhaust gas dust removing mechanism 72 includes a secondary spray dust collector 721 connected to the primary spray dust collector 711. The primary waste gas dust removal mechanism 71 is combined with the secondary waste gas dust removal mechanism 72 to perform two-stage dust removal treatment on waste gas, so that the waste gas emission meets the environmental protection requirement.
In this embodiment, the material receiving device 4 includes a material receiving pipeline 41 connected to the bottom of the spray drying tower 3, a cold air dehumidifier 42 is connected to the head end of the material receiving pipeline 41, a material receiving bin 43 is connected to the tail end of the material receiving pipeline 41, the material receiving bin 43 is connected to a material receiving blower 44, a tower air-lock valve 45 is arranged on the material receiving pipeline 41 and between the cold air dehumidifier 42 and the spray drying tower 3, and at least one material receiving air-lock valve 46 is arranged on the material receiving bin 43. The air is dehumidified by the cold-air dehumidifier 42, and then the dehumidified air is pumped into the material receiving pipeline 41 under the conveying power provided by the material receiving fan 44, so that the dehumidified air blows the dried powder or fine particle product into the material receiving bin 43, and the material receiving process is completed.
The embodiment of the invention also provides a feed liquid drying method based on the pressure spray drying equipment, which comprises the following steps:
(1) The liquid material is sent into a pressure type atomizer 11 from a feeding pipeline 12 at a high pressure of 10-20MPa, the liquid material is atomized into small droplets by the pressure type atomizer 11 and is conveyed to a spray drying tower 3;
a liquid supercharger with a pressure display is connected to a pipeline on the side wall of the feeding pipeline 12, liquid flowing inside the feeding pipeline 12 is pressurized through the liquid supercharger to reach the expected pressure, and the real-time flowing pressure of the liquid is judged through the pressure display carried by the outer side of the supercharger;
(2) The air with steam enters an air inlet dehumidifier 21 for dehumidification, the dehumidified air enters a first steam heat exchanger 22 from a first air inlet pipeline 23, the air is heated to hot air with the temperature of 150-200 ℃ by the first steam heat exchanger 22, and then the hot air is conveyed to a spray drying tower 3;
(3) The small drops entering the spray drying tower 3 are fully contacted with hot air, the drying process is rapidly completed, the obtained powder or fine particle finished product moves downwards and receives materials, and meanwhile, waste gas with the temperature of 80-100 ℃ is upwards discharged;
wherein, the step (1) and the step (2) have no sequence.
The droplets entering the spray drying tower 3 are fully contacted with hot air to complete drying treatment, after a finished powder or fine particle product is obtained, the finished product moves downwards to receive the material, meanwhile, the waste gas is discharged upwards, the working mode of discharging the gas upwards and collecting the finished product downwards is realized, the waste gas and the finished product move in opposite directions in the spray drying tower 3, the waste gas and the finished product can be rapidly separated, the mixing between the waste gas and the finished product can be reduced, the interference between the waste gas and the waste gas is avoided, the thorough separation between the waste gas and the finished product is facilitated, the production efficiency is improved, and when the spray drying tower 3 is used for drying, the exhaust temperature of the spray drying tower 3 needs to be increased, the feeding amount is reduced, and the increase of the moisture content caused by insufficient drying is avoided;
(4) The waste gas discharged upwards is provided with micro powder and enters a cyclone separator 51, the waste gas and the powder are separated by the cyclone separator 51, and finally the waste gas is discharged and the powder is collected;
(5) The air is heated to 60 to 100 ℃ by the third steam heat exchanger 61 of the powder recovery and reuse apparatus 6, and the air is blown into the powder recovery silo 56, and the powder is blown back to the spray drying tower 3 to be dried again.
The waste gas and the micro powder are separated by the steps (4) and (5), the waste gas can be discharged according with the environmental protection requirement, the micro powder is recovered and returned to the spray drying tower (3) for drying again, the resource is recycled, and the resource waste is reduced;
in the embodiment of the invention, a liquid pressurizer with a pressure display is connected to the side wall pipeline of the feeding pipe in the step (1).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that other structures obtained by using the same or similar technical features as the above-described embodiments of the present invention are within the protection scope of the present invention.
Claims (10)
1. A pressure spray drying apparatus, comprising:
a feed liquid atomizing device for atomizing the feed liquid into mist-shaped liquid drops;
the hot air generating device is used for heating air to generate hot air;
a spray drying tower which is respectively connected with the feed liquid atomization device and the hot air generation device and is used for fully contacting the atomized liquid drops with the hot air to rapidly complete the drying process to obtain powder or fine particle finished products;
the material receiving device is arranged at the bottom of the spray drying tower and is used for collecting powder or fine particle finished products;
and the gas-solid separation device is connected to the upper end of the spray drying tower and is used for separating the waste gas from the powder.
2. A pressure spray drying apparatus according to claim 1, wherein the feed liquid atomizing device comprises a pressure atomizer connected to the spray drying tower, and a feed pipe connected to the head end of the pressure atomizer, wherein a water inlet valve, a feed valve, a pneumatic pump solenoid valve and a high pressure pump are sequentially arranged from the head end to the tail end of the feed pipe, and the tail end of the feed pipe is connected to the pressure atomizer.
3. The pressure spray drying apparatus of claim 1, wherein the hot air generating device comprises an air inlet dehumidifier, a first steam heat exchanger, a first air inlet duct connected between the air inlet dehumidifier and the first steam heat exchanger, a blower disposed on the first air inlet duct, and a first hot air duct connected between the first steam heat exchanger and the upper end of the spray drying tower.
4. A pressure spray drying apparatus according to claim 3, wherein the hot air generating device further comprises a second steam heat exchanger, a hot air blower disposed at the head end of the second steam heat exchanger, a second air inlet pipe connected between the first air inlet pipe and the hot air blower, and a second hot air pipe connected to the second steam heat exchanger and the lower portion of the spray drying tower.
5. A pressure spray drying device according to claim 1, wherein the gas-solid separation device comprises a cyclone separator, the cyclone separator has an air inlet and an air outlet at the upper end, and a powder outlet at the lower end, the air inlet is connected with the upper end of the spray drying tower through an air inlet pipeline, and the powder outlet is provided with a powder recovery bin at the lower end.
6. A pressure spray drying apparatus according to claim 5 further comprising a powder recycling apparatus connected to the powder recovery bin, the powder recycling apparatus comprising a third steam heat exchanger, a blowing hot air conduit connected between the powder recovery bin and the third steam heat exchanger, and a powder return conduit connected between the powder recovery bin and the upper end of the spray drying tower, wherein a blowing steam conduit and a blowing air conduit are provided at the head end of the third steam heat exchanger, a blowing regulating valve is provided on the blowing steam conduit, and a blowing fan and an air filter are provided on the blowing air conduit.
7. A pressure spray drying device according to claim 5, further comprising an exhaust gas dust removing device connected to the exhaust port, the exhaust gas dust removing device comprising a primary exhaust gas dust removing mechanism and a secondary exhaust gas dust removing mechanism connected to each other, the primary exhaust gas dust removing mechanism comprising a primary spray dust remover, and an exhaust gas pipe connected between the primary spray dust remover and the exhaust port, the exhaust gas pipe being provided with an exhaust fan; the secondary waste gas dust removal mechanism comprises a secondary spray dust remover connected with a primary spray dust remover.
8. A pressure spray drying apparatus according to claim 1, wherein the receiving device comprises a receiving pipe connected to the bottom of the spray drying tower, a cold air dehumidifier is connected to the head end of the receiving pipe, a receiving bin is connected to the tail end of the receiving pipe, a receiving blower is connected to the receiving bin, a tower air-lock valve is disposed on the receiving pipe between the cold air dehumidifier and the spray drying tower, and at least one receiving air-lock valve is disposed on the receiving bin.
9. Feed liquid drying method based on the pressure spray drying equipment of any one of claims 1 to 8, characterized by comprising the steps of:
(1) The liquid material is sent into a pressure type atomizer from a feed pipeline at the high pressure of 10-20MPa, the liquid material is atomized into small droplets by the pressure type atomizer and is conveyed to a spray drying tower;
(2) The air with steam enters an air inlet dehumidifier for dehumidification, the dehumidified air enters a first steam heat exchanger from a first air inlet pipeline, the first steam heat exchanger heats the air to hot air with the temperature of 150-200 ℃, and then the hot air is conveyed to a spray drying tower;
(3) The small drops entering the spray drying tower are fully contacted with hot air, the drying process is rapidly finished, the obtained powder or fine particle finished product moves downwards and receives materials, and meanwhile, waste gas with the temperature of 80-100 ℃ is upwards discharged;
wherein, the step (1) and the step (2) have no sequence;
(4) The waste gas discharged upwards is provided with micro powder and enters a cyclone separator, the cyclone separator is used for separating the waste gas from the powder, and finally the waste gas is discharged and the powder is collected;
(5) And heating the air to 60-100 ℃ by a third steam heat exchanger of the powder recycling device, blowing air into the powder recycling bin, and blowing the powder back for drying again.
10. The feed liquid drying method according to claim 9, wherein a liquid pressure booster with a pressure display is connected to the side wall pipeline of the feed pipe in the step (1).
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| CN202210769080.1A CN115253329A (en) | 2022-07-01 | 2022-07-01 | Pressure spray drying equipment and feed liquid drying method thereof |
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