CN216704274U - System for utilize high concentration calcium liquid production pellet form calcium chloride - Google Patents
System for utilize high concentration calcium liquid production pellet form calcium chloride Download PDFInfo
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- CN216704274U CN216704274U CN202122559773.1U CN202122559773U CN216704274U CN 216704274 U CN216704274 U CN 216704274U CN 202122559773 U CN202122559773 U CN 202122559773U CN 216704274 U CN216704274 U CN 216704274U
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Abstract
The utility model discloses a system for producing spherical calcium chloride by using high-concentration calcium liquid, which comprises the following components: the gas outlet of the spray fluidized bed is connected with a tail gas treatment device; the discharge port of the spray fluidized bed is connected with a screening machine, the output of the screening machine is divided into two paths, one path outputs finished products, and the other path outputs and is connected with a material returning device; the compressed air is heated and then sent to the spraying fluidized bed to be used as an atomizing medium. The utility model adopts the heated compressed air as the atomizing medium, wherein one path is used as the atomizing medium, and the other path is used for cleaning scabs at the spray nozzle, thereby optimizing the structure of the spray nozzle and preventing the scabs of the calcium liquid at the spray hole from blocking the spray hole.
Description
Technical Field
The utility model relates to the technical field of production of spherical calcium chloride, in particular to a system for producing spherical calcium chloride by using high-concentration calcium liquid.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The spherical calcium chloride is generally anhydrous calcium chloride, the existing application is a spray fluidized bed granulation process, the content of calcium chloride in raw materials is 25-40%, the process flow is shown in figure 1, the return material of the calcium chloride enters the fluidized bed from a feeding screw conveyor, the feed liquid of the calcium chloride is sprayed out from a spray head above a wind distribution plate of the fluidized bed through a pump, and the feed liquid is mixed with the seed crystal of the return material to grow the crystal form and dry and dehydrate the crystal form; the heat source for drying and dehydration comes from high-temperature flue gas generated by burning of an external gas furnace, and the high-temperature flue gas is blown into a spraying fluidized bed by a blower to dry calcium chloride above an air distribution plate in the fluidized bed; and after the drying process is finished, discharging the fluidized bed, separating the fluidized bed by using a vibrating screen, feeding oversize products into subsequent packages, and feeding undersize products into the fluidized bed again for reaction and drying through a return screw conveyor and a bucket elevator.
The process is only suitable for low-concentration (less than or equal to 40%) calcium chloride raw materials, when the concentration of the calcium chloride is increased, the viscosity of the solution is increased, the crystallization temperature is increased rapidly, the calcium chloride solution is easy to have the phenomena of nonuniform atomization, liquid flowing and the like at a nozzle, the diameter of solid particles around the nozzle is expanded too fast, and the solid particles are easy to agglomerate, so that the fluidized bed is dead.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a system for producing spherical calcium chloride by using high-concentration calcium solution, which can adapt to the characteristics of easy crystallization and high viscosity of the high-concentration calcium chloride solution (the calcium chloride solution with the concentration of 50-70%), avoid the internal agglomeration of a fluidized bed and ensure the continuous and stable operation of the fluidized bed.
In some embodiments, the following technical scheme is adopted:
a system for producing calcium chloride pellets from a high concentration calcium solution comprising: the gas outlet of the spray fluidized bed is connected with a tail gas treatment device; the discharge port of the spray fluidized bed is connected with a screening machine, the output of the screening machine is divided into two paths, one path outputs finished products, and the other path outputs the finished products and is connected with a material returning device; the compressed air is heated and then sent to the spraying fluidized bed to be used as an atomizing medium.
As a further scheme, a fluidizing section of the spray fluidized bed is provided with a plurality of nozzles, and each nozzle comprises two paths of compressed air channels; the output of one channel is used as an atomizing medium, and the output of the other channel is used for cleaning scabs at the nozzle.
As a further scheme, the nozzle adopts two-fluid spraying, and the atomization mode is upward spraying.
As a further proposal, the high-concentration calcium liquid enters a nozzle of a spray fluidized bed through a raw material pump, and the high-concentration calcium liquid is atomized after heated compressed air is mixed with the high-concentration calcium liquid.
As a further scheme, natural air enters the gas furnace after being pressurized by the air blower, the air enters the pressure equalizing zone of the spray fluidized bed after being heated to a set temperature and then enters the independent air chambers after being equalized by the air distribution plate of the spray fluidized bed.
As a further scheme, calcium chloride particles are pre-paved on a fluidizing section of the spray fluidized bed to serve as seed crystals, and heated air passes through the air distribution plate to directly contact the seed crystals and atomized liquid drops.
As a further proposal, the local opening rate of the fluidized bed air distribution plate around the nozzle is higher than the opening rate of other positions.
As a further aspect, the tail gas treatment device includes: and the cyclone dust collector is connected with the gas outlet of the spray fluidized bed and is sequentially connected with the wet dust collector and the induced draft fan.
As a further scheme, the bottom discharge end of the cyclone dust collector is connected with a screening machine.
As a further scheme, the material returning device comprises: the crusher is connected with the screening machine, the crusher is sequentially connected with the material returning screw conveyor, the material returning hopper lifting machine and the feeding screw conveyor, and the feeding screw conveyor is connected with the spraying fluidized bed.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the utility model adopts the heated compressed air as the atomizing medium, wherein one path is used as the atomizing medium, and the other path is used for cleaning scabs at the spray nozzle, thereby optimizing the structure of the spray nozzle and preventing the scabs of the calcium liquid at the spray hole from blocking the spray hole.
(2) The conveying pipeline and the conveying pump of the utility model perform steam tracing, thereby avoiding crystallization of calcium chloride solution.
(3) The utility model increases the local aperture ratio of the air distribution plate of the fluidized bed around the nozzle, and strengthens the fluidization effect; the nozzle is arranged above the fluidized layer, and the atomization direction is downward, so that the bottom of the fluidized layer is prevented from caking.
Additional features and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic system diagram of a conventional anhydrous calcium chloride spray fluidized bed production process;
FIG. 2 is a schematic view of a system for producing calcium chloride pellets using a high-concentration calcium solution according to an embodiment of the present invention;
the system comprises an air blower 1, a gas furnace 2, a raw material pump 3, a compressed air heater 4, a return hopper lifter 5, a feeding screw conveyor 6, a spray fluidized bed 7, a cyclone dust collector 8, a wet dust collector 9, an induced draft fan 10, a screening machine 11, a crusher 12 and a return screw conveyor 13.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application 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 example embodiments according to the present application. 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.
Example one
In one or more embodiments, disclosed is a system for producing calcium chloride pellets by using a high-concentration calcium solution, which specifically includes, with reference to fig. 2: the spray fluidized bed 7, the air outlet of the spray fluidized bed 7 connects the tail gas processing unit; the discharge hole of the spraying fluidized bed 7 is connected with a sieving machine 11, the output of the sieving machine 11 is divided into two paths, one path outputs finished products, and the other path outputs and is connected with a material returning device.
The high-concentration calcium solution in the present embodiment is a calcium chloride solution having a concentration of 50 to 70%.
A plurality of nozzles are arranged above an air distribution plate of the spray fluidized bed 7, and each nozzle comprises two paths of compressed air channels; the output of one channel is used as an atomizing medium, and the output of the other channel is used for cleaning scabs at the nozzle.
In the embodiment, the nozzle adopts two-fluid spraying, the atomizing mode is that high-concentration calcium chloride solution with the upward spraying concentration of 50-70% is pressurized and conveyed to the spraying fluidized bed 7 through the raw material pump 3 and enters the spraying fluidized bed from the axial direction of the nozzle, compressed air is heated by the compressed air heater and then enters the spraying fluidized bed from the side surface of the nozzle, two compressed air channels are arranged in the spraying fluidized bed, the compressed air in one channel is fully mixed with the calcium chloride solution and then is atomized, and the compressed air sprayed from the other channel is used for cleaning scabs at the tail end of the spraying fluidized bed.
The nozzle is arranged in a fluidized bed fluidization section, a large number of calcium chloride particles are pre-paved in the fluidization section to serve as seed crystals, a calcium chloride solution is atomized at the nozzle under the action of compressed air, atomized liquid drops are directly contacted with the seed crystals of the fluidization section and are coated and condensed on the surface of the seed crystals, partial moisture in the liquid drops is evaporated under the action of the fluidized gas (high-temperature air), solids are attached to the surface of the seed crystals, and the seed crystals grow up to finally form the calcium chloride particles.
The system adopts air as a drying medium and a fluidizing medium, natural air is pressurized by an air blower 1 and then enters a gas furnace 2, a small amount of air participates in the combustion of natural gas, the rest of air is mixed with high-temperature flue gas generated by the combustion, the air is heated to a set temperature and then enters a pressure equalizing area at the bottom of a spray fluidized bed 7, the air enters each independent air chamber after pressure equalization, the high-temperature air passes through an air distribution plate to directly contact with seed crystals and atomized liquid drops, moisture is evaporated, and the air temperature is reduced.
In this embodiment, the exhaust gas treatment device includes: the cyclone dust collector 8 is connected with the air outlet of the spraying fluidized bed 7, and the cyclone dust collector 8 is sequentially connected with a wet dust collector 9 and an induced draft fan 10; in addition, the bottom discharge end of the cyclone 8 is connected with a screening machine 11.
The cooled air carries part of fine powder and water to separate a spray fluidized bed 7 and enters a cyclone dust collector 8, most of the fine powder is collected in the cyclone dust collector 8 and returns to be used as seed crystal, and tail gas discharged from the cyclone dust collector 8 enters a wet dust collector 9 to be washed and purified and then is exhausted by a draught fan 10.
The material returning device comprises: the crusher 12 is connected with the sieving machine 11, the crusher 12 is sequentially connected with a return material screw conveyer 13, a return material hopper lifting machine 5 and a feeding screw conveyer 6, and the feeding screw conveyer 6 is connected with the spraying fluidized bed 7.
The dried calcium chloride particles are discharged from the tail part of the spraying fluidized bed 7 and enter a sieving machine 11, the qualified particles (1-5 mm) after being sieved are used as finished products and enter a subsequent cooling system, and coarse particles (larger than 5mm) are crushed by a crusher 12 and then return to the spraying fluidized bed 7 through a material returning screw conveyor 13, a material returning hopper lifter 5 and a feeding screw conveyor 6 to serve as seed crystals together with fine particles (smaller than 1 mm).
In the embodiment, the opening rate of the air distribution plate of the fluidized bed at the nozzle is obviously higher than that of other positions, so that the fluidization effect of the nozzle is enhanced, and the continuous and stable operation of the fluidized bed is ensured.
In the embodiment, heated compressed air is used as an atomizing medium, and the nozzle structure is optimized, so that the nozzle is prevented from scabbing. Can be suitable for high-concentration (50-70%) calcium chloride solution, and can reduce evaporation quantity of ton product and energy consumption of ton product.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the utility model, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (7)
1. A system for producing spherical calcium chloride by using high-concentration calcium liquid is characterized by comprising the following components: the gas outlet of the spray fluidized bed is connected with a tail gas treatment device; the discharge port of the spray fluidized bed is connected with a screening machine, the output of the screening machine is divided into two paths, one path outputs finished products, and the other path outputs and is connected with a material returning device; the compressed air is heated and then sent to the spraying fluidized bed to be used as an atomizing medium.
2. The system for producing calcium chloride pellets from high-concentration calcium solution as claimed in claim 1, wherein the fluidizing section of the spray fluidized bed is provided with a plurality of nozzles, each of which comprises two compressed air passages; the output of one channel is used as an atomizing medium, and the output of the other channel is used for cleaning scabs at the nozzle.
3. The system for producing calcium chloride pellets using a high concentration calcium solution as claimed in claim 2, wherein the nozzle is a two-fluid spray and the atomization is an upward spray.
4. The system for producing calcium chloride pellets from a high-concentration calcium solution as claimed in claim 1, wherein the spray fluidized bed further comprises an air distribution plate, a plurality of nozzles are provided above the air distribution plate of the spray fluidized bed, and the air distribution plate of the fluidized bed has a higher local opening ratio around the nozzles than at other positions.
5. The system for producing calcium chloride pellets using a high-concentration calcium solution as set forth in claim 1, wherein the tail gas treatment device comprises: and the cyclone dust collector is connected with the gas outlet of the spray fluidized bed and is sequentially connected with the wet dust collector and the induced draft fan.
6. The system for producing calcium chloride pellets from high-concentration calcium liquid according to claim 5, wherein the bottom discharge end of the cyclone is connected with a sieving machine.
7. The system for producing calcium chloride pellets using a high-concentration calcium solution as set forth in claim 1, wherein said returning means comprises: the crusher is connected with the screening machine, the crusher is sequentially connected with the material returning screw conveyor, the material returning hopper lifting machine and the feeding screw conveyor, and the feeding screw conveyor is connected with the spraying fluidized bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122559773.1U CN216704274U (en) | 2021-10-22 | 2021-10-22 | System for utilize high concentration calcium liquid production pellet form calcium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122559773.1U CN216704274U (en) | 2021-10-22 | 2021-10-22 | System for utilize high concentration calcium liquid production pellet form calcium chloride |
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| Publication Number | Publication Date |
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| CN216704274U true CN216704274U (en) | 2022-06-10 |
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| CN202122559773.1U Active CN216704274U (en) | 2021-10-22 | 2021-10-22 | System for utilize high concentration calcium liquid production pellet form calcium chloride |
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2021
- 2021-10-22 CN CN202122559773.1U patent/CN216704274U/en active Active
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