CN113213509A - Ammonium sulfate solution concentration drying system, process and application - Google Patents
Ammonium sulfate solution concentration drying system, process and application Download PDFInfo
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- CN113213509A CN113213509A CN202110454982.1A CN202110454982A CN113213509A CN 113213509 A CN113213509 A CN 113213509A CN 202110454982 A CN202110454982 A CN 202110454982A CN 113213509 A CN113213509 A CN 113213509A
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- sulfate solution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
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Abstract
The invention relates to a concentration drying system, a process and an application of an ammonium sulfate solution, belonging to the field of chemical industry; the device comprises a cyclone, a vacuum belt filter, a vacuum pumping system, a blower, a hot air heater, a flash evaporation dryer, a cyclone dust collector storage tank, a bag-type dust collector, an induced draft fan, a hopper, a screw conveyor, a packing machine, a material liquid tank, a material liquid pump, an auxiliary pipeline and other components. The device is characterized in that the ammonium sulfate solution conveyed by an external system is subjected to step-by-step dehydration treatment, so that the water content of the final ammonium sulfate solid material is reduced to be within 0.5 percent, and the standard of direct packaging and external selling is achieved.
Description
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to an ammonium sulfate solution concentration drying device and an ammonium sulfate solution concentration drying process, which are suitable for various systems for outputting ammonium sulfate solutions, can ensure that the water content of dried ammonium sulfate solids is reduced to be within 0.5 percent, and reach the standard of direct packaging and export sales.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
A traditional ammonium sulfate drying treatment device generally adopts a vibrating fluidized bed drying system. The simple flow of the drying system of the vibrated fluidized bed comprises the following steps: the air blower inputs the filtered air into the air heater, the heated hot air enters the lower box body of the main machine, and then the dried material is vertically blown in from bottom to top through the air distribution plate of the fluidized bed, so that the material is in a boiling state. The material enters the machine from the feeding hole, the main machine generates directional vibration under the action of the exciting force of the vibration motor, so that the material is thrown along the horizontal direction, and the dried material forms a fluidized state under the combined action of the hot air flow and the machine vibration, thereby obtaining the drying effect. After the vibrated fluidized bed drying system operates for a period of time, because the fluidized bed distribution plate is provided with a sieve plate, a screen and a sintered orifice plate, the material leakage phenomenon is easy to generate in the operation process, and if the filter screen is added, the system resistance is increased, and the drying effect is influenced. The core equipment of the vibrated fluidized bed drying system is a vibrated fluidized bed dryer, the vibration source of the vibrated fluidized bed dryer is a vibration motor, and the equipment has high running noise. The vibrating piece is easy to damage, the system operation period is short, and the maintenance is frequent.
Disclosure of Invention
In order to overcome the problems, the invention provides an ammonium sulfate solution concentrating and drying device, which is characterized in that the device carries out step-by-step dehydration treatment on an ammonium sulfate solution with the solid content of 15% or more, which is conveyed by an external system, so that the water content of a final ammonium sulfate solid material is reduced to be within 0.5%, and the standard of direct packaging and external selling is achieved. The device has good system sealing performance, is not easy to leak materials, has few easily damaged parts and has long system operation period.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided an ammonium sulfate solution concentrating and drying system, comprising: a cyclone, a vacuum belt filter, a flash dryer, a blower, a hot air heater, a cyclone dust collector, a bag-type dust collector and a hopper B; the cyclone, the vacuum belt filter, the flash dryer, the cyclone dust collector, the bag-type dust collector and the hopper B are sequentially connected, an air inlet at the bottom of the flash dryer is connected with an air outlet of a hot air heater, and the hot air heater is connected with a blower; the cyclone dust collector is also sequentially connected with a storage tank of the cyclone dust collector and a hopper A.
The invention has the following brief flow: ammonium sulfate solution with solid content of 15% or more and delivered from external system is fed into cyclone for primary solid-liquid separation, and the separated sulfuric acid isAnd (4) recovering the ammonium supernatant in a feed liquid tank, and performing suction filtration on the separated concentrated-phase ammonium sulfate solution in a vacuum belt filter. And (4) recovering the clear liquid after the vacuum filtration by the vacuum belt filter in a liquid tank, and drying the ammonium sulfate solid filter cake in a flash evaporation dryer. The air blower blows air into the hot air heater to heat, hot air is heated to about 150 ℃, an outlet of the hot air heater is directly connected with the flash evaporation dryer, hot air heated by the hot air heater enters the bottom of the flash evaporation dryer through an inlet pipe at a proper spraying speed by the air blower to enter the stirring, crushing and drying chamber, strong shearing, blowing and rotating effects are generated on materials, and the materials are atomized by centrifugation, shearing, collision and friction, so that mass and heat transfer are enhanced. At the bottom of the flash dryer, the larger and wetter particle groups are mechanically crushed under the action of the stirrer, the moisture content is lower, and the particles with smaller particle sizes are entrained by the rotating airflow and rise, and are further dried in the rising process. The hot air and the ammonium sulfate solid particles are mixed and transferred to enter the cyclone dust collector, gas-solid separation is carried out under the centrifugal force action of the cyclone dust collector, the ammonium sulfate solid particles are gathered at the bottom of the cyclone dust collector through the centrifugal action of the cyclone dust collector, and the ammonium sulfate solid particles enter a storage tank of the cyclone dust collector through a special discharge valve to be temporarily stored. And the hot air at the top of the cyclone dust collector enters the bag-type dust collector along with the ammonium sulfate solid particles which are not separated for secondary gas-solid separation. The ammonium sulfate solid particles separated by the bag-type dust collector are recycled to a hopper B, and the content of the ammonium sulfate solid particles in the gas penetrating through the bag is 5mg/Nm3And the waste gas reaches the discharge standard within the range, and is directly discharged into the atmosphere after passing through a draught fan. Ammonium sulfate that keeps in cyclone storage tank gets into hopper A in, carries to packagine machine through screw conveyer with the ammonium sulfate in the hopper B time-sharing and carries out the packing and handle. At this time, the water content of the ammonium sulfate solid is reduced to be within 0.5 percent, and the standard of package export is achieved. Clear liquid from the cyclone and clear liquid from the vacuum belt filter enter a feed liquid tank for storage, and a stirring device is arranged at the bottom of the feed liquid tank to prevent the ammonium sulfate solution from crystallizing. And after the liquid level in the feed liquid tank reaches the standard, pumping the ammonium sulfate solution into the original system through the feed liquid pump, and performing concentration treatment again.
In a second aspect of the present invention, there is provided a process for concentrating and drying an ammonium sulfate solution, comprising:
carrying out solid-liquid separation on the ammonium sulfate solution with the solid content of 15% or more to obtain a supernatant and a concentrated phase ammonium sulfate solution;
carrying out suction filtration on the concentrated phase ammonium sulfate solution to obtain a filter cake and a clear solution;
carrying out flash evaporation drying on the filter cake, and carrying out mass transfer and heat transfer with hot air to obtain an ammonium sulfate gas-solid mixture;
and carrying out gas-solid separation on the ammonium sulfate gas-solid mixture to obtain ammonium sulfate solid particles.
The invention can continuously and stably carry out concentration and drying treatment on the ammonium sulfate solution sent from production. The process flow is simple, the occupied area is small, the automatic adjustment is simple, the equipment operation cost is low, the water content of the treated ammonium sulfate solid can be reduced to be within 0.5 percent, and the treated ammonium sulfate solid reaches the standard of package export sales.
In a third aspect of the present invention, there is provided an application of any one of the above ammonium sulfate solution concentrating and drying systems in the chemical field.
The invention can efficiently treat the ammonium sulfate solution delivered by the external system, can reduce the comprehensive operation cost of enterprises and increase the economic benefits of the enterprises, and is expected to be widely applied in the chemical field.
The invention has the beneficial effects that:
(1) the invention can continuously and stably concentrate and dry the ammonium sulfate solution sent by production. The process flow is simple, the occupied area is small, the automatic adjustment is simple, the equipment operation cost is low, the water content of the treated ammonium sulfate solid can be reduced to be within 0.5 percent, and the treated ammonium sulfate solid reaches the standard of package export sales. And the system is flexible to operate, and the operation parameters of the device can be adjusted according to the amount of ammonium sulfate liquid conveyed by the external system, so that the ammonium sulfate drying device and the process are in an optimal state of long-term, stable and efficient operation. The device has good system sealing performance, is not easy to leak materials, has few easily damaged parts and does not need frequent maintenance. The method can efficiently treat the ammonium sulfate solution delivered by the external system in the long run, can reduce the comprehensive operation cost of enterprises, and can increase the economic benefits of the enterprises.
(2) The invention has simple structure, convenient operation, strong practicability and easy popularization.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an ammonium sulfate solution concentrating and drying apparatus and process;
1. the device comprises a cyclone, 2, a vacuum belt filter, 3, a vacuum pumping system, 4, a blower, 5, a hot air heater, 6, a flash evaporation dryer, 7, a cyclone dust collector, 8, a storage tank of the cyclone dust collector, 9, a bag-type dust collector, 10, an induced draft fan, 11, hoppers A, B, 12, a spiral conveyor, 13, a packing machine, 14, a material liquid tank, 15 and a material liquid pump.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
The utility model provides an ammonium sulfate solution concentration drying device, this device carries the ammonium sulfate solution that contains solid content 15% and above to the external system and carries out dehydration step by step, makes final ammonium sulfate solid material water content reduce to within 0.5%, reaches the standard of direct package export sales.
A concentration and drying process for ammonium sulfate solution includes such steps as delivering the ammonium sulfate solution with solid content of 15% or more from external system to cyclone for primary solid-liquid separation, delivering the supernatant of ammonium sulfate to liquid tank for recovery, delivering the concentrated ammonium sulfate solution with solid content up to 40-50%, vacuum filtering by belt filter, and reducing the solid water content to less than 8%. And (4) recovering the clear liquid after the vacuum filtration by the vacuum belt filter in a liquid tank, and drying the ammonium sulfate solid filter cake in a flash evaporation dryer. The air blower blows air into the hot air heater to heat, hot air is heated to about 150 ℃, an outlet of the hot air heater is directly connected with the flash evaporation dryer, hot air heated by the hot air heater enters the bottom of the flash evaporation dryer through an inlet pipe at a proper spraying speed by the air blower to enter the stirring, crushing and drying chamber, strong shearing, blowing and rotating effects are generated on materials, and the materials are atomized by centrifugation, shearing, collision and friction, so that mass and heat transfer are enhanced. At the bottom of the flash dryer, the larger and wetter particle groups are mechanically crushed under the action of the stirrer, the moisture content is lower, the particles with smaller particle size are entrained by the rotating airflow and rise, and in the rising processAnd (5) further drying. At the outlet of the flash dryer, the water content of the ammonium sulfate solid is reduced to less than 1%. The hot air and the ammonium sulfate solid particles are mixed and transferred to enter the cyclone dust collector, gas-solid separation is carried out under the centrifugal force action of the cyclone dust collector, 90% of the ammonium sulfate solid particles are gathered at the bottom of the cyclone dust collector through the centrifugal action of the cyclone dust collector, and the gathered ammonium sulfate solid particles enter a storage tank of the cyclone dust collector through a special discharge valve to be temporarily stored. And the hot air at the top of the cyclone dust collector enters the bag-type dust collector along with the ammonium sulfate solid particles which are not separated for secondary gas-solid separation. After separation by a bag-type dust collector, 99.99% of ammonium sulfate solid particles are recovered to a hopper B, and the content of the ammonium sulfate solid particles in the gas penetrating through the bag is 5mg/Nm3And the waste gas reaches the discharge standard within the range, and is directly discharged into the atmosphere after passing through a draught fan. Ammonium sulfate that keeps in cyclone storage tank gets into hopper A in, carries to packagine machine through screw conveyer with the ammonium sulfate in the hopper B time-sharing and carries out the packing and handle. At this time, the water content of the ammonium sulfate solid is reduced to be within 0.5 percent, and the standard of package export is achieved. Clear liquid from the cyclone and clear liquid from the vacuum belt filter enter a feed liquid tank for storage, and a stirring device is arranged at the bottom of the feed liquid tank to prevent the ammonium sulfate solution from crystallizing. And after the liquid level in the feed liquid tank reaches the standard, pumping the ammonium sulfate solution into the original system through the feed liquid pump, and performing concentration treatment again.
In some embodiments, the ammonium sulfate solution with a solid content of 15% or more, which is delivered by the external system, first enters a cyclone for preliminary solid-liquid separation, the separated ammonium sulfate supernatant enters a feed liquid tank for recovery, and the separated concentrated phase ammonium sulfate solution enters a vacuum belt filter for suction filtration.
Preferably, the clear liquid after the vacuum filtration by the vacuum belt filter enters a feed liquid tank for recovery, and the ammonium sulfate solid filter cake enters a flash evaporation dryer for drying treatment.
In some embodiments, the blower blows air into the hot air heater for heating, and the hot air is heated to about 150 ℃.
In some embodiments, the hot air heated by the hot air heater is fed into the bottom of the flash dryer through the inlet pipe at a proper spouting speed by the blower, and enters the stirring, crushing and drying chamber to generate strong shearing, floating and rotating effects on the materials, and the materials are micronized by centrifugation, shearing, collision and friction, so that the mass and heat transfer are enhanced. At the bottom of the flash dryer, the larger and wetter particle groups are mechanically crushed under the action of the stirrer, the moisture content is lower, and the particles with smaller particle sizes are entrained by the rotating airflow and rise, and are further dried in the rising process.
In some embodiments, the hot air is mixed with ammonium sulfate solid particles for heat transfer and then enters a cyclone dust collector, gas-solid separation is carried out in the cyclone dust collector, the ammonium sulfate solid particles are gathered at the bottom of the cyclone dust collector through the centrifugal action of the cyclone dust collector, and then enter a storage tank of the cyclone dust collector through a special discharge valve for temporary storage.
In some embodiments, the hot air at the top of the cyclone dust collector enters the bag-type dust collector along with the ammonium sulfate solid particles which are not separated for secondary gas-solid separation.
In some embodiments, the ammonium sulfate solid particles separated by the bag-type dust collector are recycled to the hopper B, the content of the ammonium sulfate solid particles in the gas penetrating through the bag is within 5mg/Nm3, the ammonium sulfate solid particles reach the external discharge standard, and the ammonium sulfate solid particles are directly discharged into the atmosphere after passing through the induced draft fan.
In some embodiments, the ammonium sulfate temporarily stored in the cyclone storage tank enters the hopper A, and is conveyed to a packaging machine for packaging processing by a screw conveyor in a time-sharing manner with the ammonium sulfate in the hopper B. At this time, the water content of the ammonium sulfate solid is reduced to be within 0.5 percent, and the standard of package export is achieved.
In some embodiments, the clear liquid from the cyclone and the clear liquid from the vacuum belt filter enter a feed tank for storage, and the bottom of the feed tank is provided with a stirring device for preventing the ammonium sulfate solution from crystallizing.
In some embodiments, after the liquid level in the feed liquid tank reaches the standard, the ammonium sulfate solution is pumped into the original system through the feed liquid pump, and the concentration treatment is carried out again.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
as shown in figure 1, ammonium sulfate solution with solid content of 15% or more (the treatment capacity of the system to the ammonium sulfate solution is 22.9 cubic meters per hour) conveyed by an external system firstly enters a cyclone 1 for primary solid-liquid separation, the separated ammonium sulfate supernatant enters a feed liquid tank for recovery, and the separated concentrated phase ammonium sulfate solution enters a vacuum belt filter 2 for suction filtration. And the clear liquid after the suction filtration of the vacuum belt filter 2 enters a feed liquid tank for recovery, and the ammonium sulfate solid filter cake enters a flash evaporation dryer 6 for drying treatment. The air blower 4 blows air into the hot air heater 5 to heat, the hot air is heated to about 150 ℃, an outlet of the hot air heater 5 is directly connected with the flash dryer 6, the hot air heated by the hot air heater 5 is fed into the bottom of the flash dryer 6 from an inlet pipe at a proper jetting speed by the air blower 4 to enter the stirring, crushing and drying chamber, strong shearing, blowing and rotating effects are generated on materials, and the materials are atomized by centrifugation, shearing, collision and friction, so that the mass and heat transfer are enhanced. At the bottom of the flash dryer 6, the larger and wetter particle mass is mechanically crushed under the action of the stirrer, the moisture content is lower, and the particles with smaller particle size are entrained by the rotating airflow and rise, and are further dried in the rising process. The hot air and the ammonium sulfate solid particles are mixed and transferred heat and then enter the cyclone dust collector 7, gas-solid separation is carried out under the centrifugal force action of the cyclone dust collector 7, the ammonium sulfate solid particles are gathered at the bottom of the cyclone dust collector 7 through the centrifugal action of the cyclone dust collector 7, and the ammonium sulfate solid particles enter the storage tank 8 of the cyclone dust collector through the discharge valve for temporary storage. The hot air at the top of the cyclone dust collector 7 enters the bag-type dust collector 9 along with the ammonium sulfate solid particles which are not separated for secondary gas-solid separation. The ammonium sulfate solid particles separated by the bag-type dust collector 9 are recycled to the hopper B (11), and the content of the ammonium sulfate solid particles in the gas penetrating through the bag is 5mg/Nm3And the waste gas reaches the discharge standard within the range, and is directly discharged into the atmosphere after passing through the induced draft fan 10. Ammonium sulfate temporarily stored in the storage tank 8 of the cyclone dust collector enters a hopper A (11), and is conveyed to a packing machine 13 for packing treatment through a screw conveyor 12 at intervals with the ammonium sulfate in the hopper B. At this point, the water content of the ammonium sulfate solids has decreasedWithin 0.5 percent, the product reaches the standard of package export sales. Clear liquid from the cyclone 1 and clear liquid from the vacuum belt filter 2 enter a feed tank 14 for storage, and a stirring device is arranged at the bottom of the feed tank 14 to prevent the ammonium sulfate solution from crystallizing. When the liquid level in the feed liquid tank 14 reaches the standard, the ammonium sulfate solution is pumped into the original system through the feed liquid pump 15, and concentration treatment is carried out again.
The data obtained by comparison with a common flash dryer without hot air indicates that: the drying efficiency of the system can be improved by 5-8%, and the system has obvious advantages for the ammonium sulfate device for continuous production.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An ammonium sulfate solution concentrating and drying system is characterized by comprising: a cyclone, a vacuum belt filter, a flash dryer, a blower, a hot air heater, a cyclone dust collector, a bag-type dust collector and a hopper B; the cyclone, the vacuum belt filter, the flash dryer, the cyclone dust collector, the bag-type dust collector and the hopper B are sequentially connected, an air inlet at the bottom of the flash dryer is connected with an air outlet of a hot air heater, and the hot air heater is connected with a blower; the cyclone dust collector is also sequentially connected with a storage tank of the cyclone dust collector and a hopper A.
2. The ammonium sulfate solution concentrating and drying system as claimed in claim 1, wherein the cyclone and the vacuum belt filter are further connected to a feed tank, respectively.
3. The ammonium sulfate solution concentrating and drying system as claimed in claim 2, wherein the outlet of the feed liquid tank is further connected with the inlet of the cyclone.
4. The ammonium sulfate solution concentrating and drying system as claimed in claim 2, wherein the feed liquid tank is provided with a stirring device and a feed liquid pump.
5. The ammonium sulfate solution concentrating and drying system as claimed in claim 1, wherein the hopper A and the hopper B are respectively connected to a packing machine.
6. The ammonium sulfate solution concentrating and drying system as claimed in claim 1, wherein the bag-type dust remover is connected with a draught fan.
7. A concentration and drying process of an ammonium sulfate solution is characterized by comprising the following steps:
carrying out solid-liquid separation on the ammonium sulfate solution with the solid content of 15% or more to obtain a supernatant and a concentrated phase ammonium sulfate solution;
carrying out suction filtration on the concentrated phase ammonium sulfate solution to obtain a filter cake and a clear solution;
carrying out flash evaporation drying on the filter cake, and carrying out mass transfer and heat transfer with hot air to obtain an ammonium sulfate gas-solid mixture;
and carrying out gas-solid separation on the ammonium sulfate gas-solid mixture to obtain ammonium sulfate solid particles.
8. The process for concentrating and drying ammonium sulfate solution as claimed in claim 7, wherein the ammonium sulfate solid particle content is 5mg/Nm3The water content is less than 0.5 percent.
9. The ammonium sulfate solution concentrating and drying process as claimed in claim 7, wherein the temperature of the hot air is 140-160 ℃.
10. Use of the ammonium sulphate solution concentrating and drying system of any one of claims 1 to 6 in the chemical industry.
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