CN216716840U - Energy-conserving drying system of calcium hydrogen phosphate - Google Patents
Energy-conserving drying system of calcium hydrogen phosphate Download PDFInfo
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- CN216716840U CN216716840U CN202123122228.2U CN202123122228U CN216716840U CN 216716840 U CN216716840 U CN 216716840U CN 202123122228 U CN202123122228 U CN 202123122228U CN 216716840 U CN216716840 U CN 216716840U
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Abstract
The utility model relates to an energy-saving drying system for calcium hydrophosphate, which comprises: the rotary dryer comprises a dryer main body and a transmission device, wherein the dryer main body comprises a shell, a steam pipe is arranged in the shell and is connected with a saturated steam source, steam condensate water is introduced into a rear-end process through a siphon pipe arranged at a discharge port end of the equipment, and the transmission device is connected with the dryer main body; the air inlet is arranged at the feed end of the dryer main body, the air outlet is arranged at the discharge end of the dryer main body, and the air inlet is communicated with the shell pass of the dryer main body; and the air outlet of the dryer cylinder is connected with the dust removal device. Along with the rotation of the rotary dryer, the calcium hydrophosphate moves along with the rotation of the rotary dryer, so that the problem of wall sticking of the calcium hydrophosphate is avoided. The tail gas treatment amount is relatively less.
Description
Technical Field
The utility model belongs to the field of drying treatment of calcium hydrophosphate products, and particularly relates to an energy-saving drying system for calcium hydrophosphate.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model 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.
Calcium hydrogen phosphate is often present in the form of a dihydrate that is stable in air and that begins to lose water of crystallization upon heating to 75 ℃ to become an anhydrous compound and that becomes a pyrophosphate at high temperatures. Because of the material property of calcium hydrogen phosphate, the temperature of calcium hydrogen phosphate is controlled between 100 ℃ and 200 ℃ during drying, too low temperature has slow drying efficiency, easy wall adhesion and poor drying effect, and too high temperature can change the chemical components.
The existing drying processes comprise direct heating type rotary drying, fluidized bed drying and airflow drying; the direct heating type drying is suitable for materials which can bear higher drying temperature, and the energy consumption is higher; the fluidized bed drying has strict requirements on feeding, and the normal fluidization of the fluidized bed dryer can be influenced by the size fraction distribution and the water content of the material; the air-flow type drying has more tail gas treatment problems and higher energy consumption.
SUMMERY OF THE UTILITY MODEL
In view of the problems in the prior art, the utility model aims to provide an energy-saving drying system for calcium hydrophosphate.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
an energy-saving drying system for calcium hydrophosphate, comprising:
the rotary dryer comprises a dryer main body and a transmission device, wherein the dryer main body comprises a shell, a steam pipe is arranged in the shell and is connected with a saturated steam source, steam condensate water is introduced into a rear-end process through a siphon pipe arranged at a discharge port end of the equipment, and the transmission device is connected with the dryer main body;
the air inlet is arranged at the feed end of the dryer main body, the air outlet is arranged at the discharge end of the dryer main body, and the air inlet is communicated with the shell pass of the dryer main body;
and the air outlet of the dryer cylinder is connected with the dust removal device.
The utility model relates to an energy-saving drying system for calcium hydrophosphate, which mainly utilizes a rotary dryer to dry the calcium hydrophosphate, the rotary dryer drives a dryer main body to rotate through a transmission device, so that the rotary drying of the calcium hydrophosphate is realized, the calcium hydrophosphate is continuously turned over along with equipment in the drying process, the problem that materials are stuck to walls is effectively avoided, and qualified products can be successfully obtained by controlling the rotating speed and adjusting the time interval of the materials entering and exiting the rotary dryer.
The rotary dryer makes the materials continuously overturn along with the equipment in the drying process through rotation, so that the drying effect is improved, and the drying effect can be improved compared with fluidized bed drying.
The rotary dryer adopts an indirect heat exchange mode, saturated steam is introduced into a steam pipe and serves as a heat source, and therefore condensed water obtained after the saturated steam is condensed can be reused. And a small amount of non-condensable gas is discharged by an exhaust device at the feed end of the rotary dryer.
The tail gas that the rotary drier produced carries the vapor and the tiny particle material that dry volatilizees for the air that air inlet got into, introduces dust collector and handles, compares in air-flowing drying method and can significantly reduce the tail gas handling capacity.
One or more technical schemes of the utility model have the following beneficial effects:
the energy-saving drying system for the calcium hydrophosphate is rotary equipment, materials are continuously turned over along with the equipment in the drying process, the problem that the materials are stuck to the wall is effectively avoided, the time interval of the materials entering and exiting the rotary dryer can be adjusted by controlling the rotating speed, qualified products can be successfully obtained, most of the materials are recycled from the discharge end of the rotary dryer, only a small amount of small-particle materials are recycled through a bag-type dust collector, and the load of a subsequent tail gas treatment section is effectively reduced;
according to the energy-saving drying system for the calcium hydrophosphate, the steam pipe is arranged in the dryer main body, saturated steam is introduced into the steam pipe, calcium hydrophosphate materials are introduced into the outer side of the steam pipe, the steam and the materials are in indirect contact in the dryer, the saturated steam is adopted for heating, the temperature is simple and convenient to control, after the steam is used for drying, condensed water is used for providing heat for the heat exchanger and the cloth bag for dust removal, most of the steam is changed into the condensed water, the heat utilization rate is high, the energy consumption is low, and under the condition of equal energy consumption, the single machine has large capacity.
The utility model adopts an indirect heating drying mode, only a small amount of air is needed to be used as a carrier after drying, and water vapor and small-particle materials volatilized from the materials in the drying process are introduced into the tail gas treatment system, so that the tail gas has simple components, small gas amount and convenient treatment, and the tail gas treatment system is greatly reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a block diagram of a rotary dryer;
FIG. 2 is a block diagram of an energy efficient drying system for dibasic calcium phosphate of the present invention;
the drying machine comprises a drying machine main body 1, a steam pipe 2, a steam pipe 3, a rotary joint assembly 4, a condensate water drain pipe 5, a catch wheel device 6, a transmission device 7, a tug wheel device 8, compressed air 9, a draught fan 10, an air heat exchanger 11, a condensate water return pipe network 12, a rotary drying machine 13, a bag-type dust collector 14, a discharge valve 15, a downstream process 16, a spiral conveyor 17, a weighing belt 18, a double-spiral feeder 19, a material 20, steam 21 and air.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model 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 disclosure 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 disclosure. 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.
As described in the background section, the prior art drying process is described as follows:
one-step and direct heating type rotary drying process
The process adopts an electric heating or fuel oil and gas mode to provide a heat source, and the core equipment is a rotary drying kiln. The advantages are large handling capacity and stable operation; the defects are that the occupied area is large, the tail gas has more heat loss, and the treatment process of the tail gas is complex, so that the energy consumption of the system is large and the investment is large. The process has high drying temperature and is not suitable for drying calcium hydrophosphate.
Second, fluidized bed drying process
The fluidized bed drying system has strict requirements on feeding, the normal fluidization of the fluidized bed dryer can be influenced by the size fraction distribution and the water content range of the materials, and the phenomenon of dead bed caused by caking of the materials is easy to occur in the drying process. The core equipment of the process is a drying fluidized bed, the single machine treatment capacity is small, the requirement of large-scale production cannot be met, and the air distribution plate of a fluidized bed dryer and the granular materials in the bed body need to be cleaned regularly. At present, no application example of the process for drying the calcium hydrophosphate is available at home and abroad.
Third, air-flow type drying
The calcium hydrogen phosphate dried by the process has a large number of applications in engineering. The material is dried by adopting a heat transfer mode of realizing fluidization by directly contacting hot gas with the material, and the continuous operation can be realized and the mass production can be realized. However, the process still has some problems that can be improved, such as: the hot air is obtained by equipment such as a heat exchanger, a heater or a hot air furnace, so that the energy consumption is high, the heat efficiency is low, and the precision requirement of the temperature control range of the hot air is high; the problem of material wall sticking is easy to occur; after the drying is finished, a large amount of tail gas containing water vapor and fine powder materials needs to be treated, and all the dried materials need to be recovered in the subsequent tail gas treatment process, and corresponding large-size rear-section tail gas treatment and material recovery equipment needs to be added, so that the load of a tail gas treatment section is increased.
The utility model relates to an energy-saving drying system for calcium hydrophosphate, which comprises:
the rotary dryer comprises a dryer main body 1 and a transmission device 6, wherein the dryer main body 1 comprises a shell, a steam pipe 2 is arranged in the shell, the steam pipe 2 is connected with a saturated steam source, steam condensate water is introduced into a rear-end process through a siphon pipe arranged at a discharge port end of equipment, and the transmission device is connected with the dryer main body;
the feeding end of the dryer main body 1 is provided with an air inlet, the discharging end is provided with an air outlet, and the air inlet is communicated with the shell pass of the dryer main body;
and the air outlet of the dryer cylinder is connected with the dust removal device.
The utility model relates to an energy-saving drying system for calcium hydrophosphate, wherein a steam pipe is arranged in a shell of a dryer main body 1, the calcium hydrophosphate is in the shell pass of the dryer main body 1 during drying, saturated steam in the steam pipe indirectly exchanges heat with the calcium hydrophosphate, so that the temperature of the calcium hydrophosphate is raised, and water molecules are evaporated. Along with the rotation of the rotary dryer, the calcium hydrophosphate overturns, so that the problem of wall sticking of the calcium hydrophosphate is avoided. The calcium hydrophosphate material is fully dried.
The condensed water of the saturated steam after condensation is discharged through a siphon tube for reuse.
The dryer main body 1 is provided with an air inlet and an air outlet and is communicated with the shell side of the dryer main body 1, and the air carries out the treatment of tail gas and the recovery of materials after entering the steam and the small-particle materials and then enters the bag-type dust collector. The tail gas treatment amount is relatively less.
As shown in fig. 1, the condensed water in the steam pipe is discharged through the condensed water drain pipe 4.
The transmission device is connected with the dryer body 1, further comprises a motor, the transmission device is connected with the motor, and the dryer body is driven to rotate through transmission of the transmission device.
As a further technical scheme, the dust removal device is a bag-type dust remover, the bag-type dust remover is provided with a heat tracing pipe, and an outlet of the siphon pipe is connected with an inlet of the heat tracing pipe. The comdenstion water of discharge saturated steam in the siphon enters into the heat tracing pipe, utilizes the waste heat heating heat tracing pipe of comdenstion water for as the heat tracing of sack dust removal, guarantees the interior temperature of equipment, can ensure by gyration desiccator exhaust year moisture, can not condense again here, prevents the phenomenon of the sticky sack that links of material, ensures the recovery of calcium hydrogen phosphate.
As a further technical scheme, the device also comprises an induced draft fan 9, wherein an inlet of the induced draft fan 9 is connected with an outlet of the bag-type dust collector 13. The gas discharged by the bag-type dust collector 13 is led out by the induced draft fan 9 to enter the next working procedure or be evacuated.
As a further technical scheme, the bag-type dust collector 13 is connected with a compressed air source. The compressed air can discharge the filtered materials in the bag-type dust collector to the screw conveyer through a discharge valve 14 connected with a discharge hole of the bag-type dust collector, and then the materials enter the next working procedure.
As a further technical scheme, the dryer further comprises a gas-solid separator and a spiral conveyer 16, wherein a discharge port of the dryer main body is connected with the gas-solid separator, a gas outlet of the gas-solid separator is connected with a bag-type dust collector 13, and the gas-solid separator and the bag-type dust collector 13 are respectively connected with the spiral conveyer 16 in a matching manner. The discharge port of the gas-solid separator is connected with a discharge valve, and the screw conveyor 16 is used for outputting materials to the next process.
As a further technical scheme, the device also comprises a weighing belt 17, and the weighing belt 17 is connected with the feed inlet of the rotary dryer 12. The weighing belt 17 is used to discharge a measured quantity of material.
As a further technical scheme, the drying device further comprises a double-screw feeder 18, a discharge hole of the double-screw feeder 18 is connected with a feed inlet of the rotary dryer 12, the double-screw feeder 18 is provided with an air inlet and a feed inlet, and the air inlet is connected with an air source.
As a further technical scheme, the heat exchanger further comprises an air heat exchanger 10, an air source is connected with the air heat exchanger 10, and an outlet of a siphon is connected with a heat exchange medium inlet of the air heat exchanger 10. The condensed water discharged from the siphon enters the air heat exchanger for heating the natural air as moisture-carrying gas, and the air can be heated to about 120-130 ℃.
Further, the condensed water discharged by the heat tracing pipe of the bag-type dust collector 13 and the air heat exchanger 10 is discharged to a condensed water return pipe network.
As a further technical solution, as shown in fig. 1, the rotary dryer 12 includes a catch wheel device 5 and a tug wheel device 7, wherein the tug wheel device 7 is connected with the dryer main body 1, and the catch wheel device 5 is connected with the tug wheel device 7.
As a further technical solution, the transmission device 6 is a transmission gear, and the transmission gear is arranged on the outer surface of the shell of the dryer main body 1. Further, the dryer body 1 is inclined relative to the horizontal plane, and the inclination angle is 0.5-1.5 degrees. The transmission gear is engaged with the transmission shaft of the motor and is driven by the transmission gear. The obliquely arranged dryer body contributes to the flow of the material.
Example 1
As shown in fig. 2, an energy-saving drying method for calcium hydrogen phosphate, the process flow of which is briefly described:
calcium hydrogen phosphate materials 19 to be dried are conveyed to a double-screw feeder 18 in front of the rotary dryer through a weighing belt 17, the double-screw feeder 18 can effectively prevent the materials from being adhered to equipment, then the materials are conveyed into the rotary dryer 12 to be dried, and the dried materials are introduced into a screw conveyor 16 through a rotary discharge valve to enter a lower-stage process;
steam 20 (saturated steam) enters a steam pipe in the rotary dryer 12 through a rotary joint component 3 at the discharge end of the rotary dryer, the steam after drying calcium hydrophosphate is changed into condensed water at about 150-160 ℃, the condensed water is introduced into a waste heat utilization system through a condensed water pipe at the discharge end of the rotary dryer, and a small amount of non-condensable gas is discharged through an exhaust device at the feed end of the rotary dryer 12;
waste heat recovery utilizes the system: a siphon is arranged at the discharge end of the rotary dryer 12, and high-temperature condensed water obtained after the material is dried by water vapor is respectively conveyed to the air heat exchanger 10 and the bag-type dust collector 13; the condensed water to the air heat exchanger 10 is used for heating the natural air 21 as moisture-carrying gas, the air can be heated to about 120-130 ℃, and the waste heat is fully utilized and then recovered through a condensed water return pipe network; the condensed water to the bag-type dust collector 13 is used as heat tracing for bag-type dust collection, the temperature in the equipment is ensured, moisture carried by the discharged moisture of the rotary dryer 12 can be ensured, recondensation can not be carried out at the position, the phenomenon that the materials are adhered to the bag is prevented, and the recovery of calcium hydrogen phosphate is ensured.
Description of the wind System: a small-flow draught fan provides power, so that natural air flows through the air heat exchanger 10 to be heated and then enters the rotary dryer 12 to be used as moisture, water vapor and small-particle materials evaporated after the materials are dried are introduced into the bag-type dust collector 13, and the filtered tail gas is emptied. The small-particle materials filtered by the bag-type dust collector 13 are discharged to the rear-section screw conveyor 16 through the bag-type lower discharge valve by pulse compressed air, and then enter the next-section process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.
Claims (10)
1. An energy-conserving drying system of calcium hydrogen phosphate which characterized in that: the method comprises the following steps:
the rotary dryer comprises a dryer main body and a transmission device, wherein the dryer main body comprises a shell, a steam pipe is arranged in the shell and is connected with a saturated steam source, steam condensate water is introduced into a rear-end process through a siphon pipe arranged at a discharge port end of the equipment, and the transmission device is connected with the dryer main body;
the air inlet is arranged at the feed end of the dryer main body, the air outlet is arranged at the discharge end of the dryer main body, and the air inlet is communicated with the shell pass of the dryer main body;
and the air outlet of the dryer cylinder is connected with the dust removal device.
2. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the dust removing device is a bag-type dust remover, the bag-type dust remover is provided with a heat tracing pipe, and the outlet of the siphon pipe is connected with the inlet of the heat tracing pipe.
3. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 2, wherein: still include the draught fan, the import of draught fan and the exit linkage of sack cleaner.
4. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the dust removing device is connected with a compressed air source.
5. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the dryer further comprises a gas-solid separator and a screw conveyor, a discharge port of the dryer main body is connected with the gas-solid separator, a gas outlet of the gas-solid separator is connected with a dust removal device, and the gas-solid separator and the dust removal device are respectively connected with the screw conveyor in a matching manner.
6. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the rotary dryer is characterized by further comprising a double-screw feeder, a discharge port of the double-screw feeder is connected with a feed port of the rotary dryer, the double-screw feeder is provided with an air inlet and a feed port, and the air inlet is connected with an air source.
7. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the air source is connected with the air heat exchanger, and the outlet of the siphon is connected with the heat exchange medium inlet of the air heat exchanger.
8. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the rotary dryer comprises a blocking wheel device and a tug device, wherein the tug device is connected with the dryer body, and the blocking wheel device is connected with the tug device.
9. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the transmission device is a transmission gear which is arranged on the outer surface of the shell of the dryer main body.
10. An energy efficient drying system for dibasic calcium phosphate as set forth in claim 1, wherein: the dryer main body is obliquely arranged relative to a horizontal plane, and the inclination angle is 0.5-1.5 degrees.
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| CN202123122228.2U CN216716840U (en) | 2021-12-10 | 2021-12-10 | Energy-conserving drying system of calcium hydrogen phosphate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115371414A (en) * | 2022-09-15 | 2022-11-22 | 南漳龙蟒磷制品有限责任公司 | Environment-friendly calcium hydrophosphate steam drying method |
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2021
- 2021-12-10 CN CN202123122228.2U patent/CN216716840U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115371414A (en) * | 2022-09-15 | 2022-11-22 | 南漳龙蟒磷制品有限责任公司 | Environment-friendly calcium hydrophosphate steam drying method |
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