CN213020681U - Salt, nitre material drying system - Google Patents
Salt, nitre material drying system Download PDFInfo
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- CN213020681U CN213020681U CN202021492586.5U CN202021492586U CN213020681U CN 213020681 U CN213020681 U CN 213020681U CN 202021492586 U CN202021492586 U CN 202021492586U CN 213020681 U CN213020681 U CN 213020681U
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Abstract
The utility model provides a salt, nitre material drying system, including rotary drying device, circulation returning charge device, screening plant, cooling device and dust removal recovery unit. The method effectively solves the problems that the energy consumption is high, a large amount of tail gas easily causes environmental pollution and the adaptability to materials to be dried is poor in the prior art. The system has good adaptability to wet materials with different water contents; the heat energy utilization efficiency is high, the energy consumption is low, and the operation cost is low; the tail gas emission is less, and the environmental protection effect is good.
Description
Technical Field
The utility model relates to a drying field especially relates to a drying system of salt, nitre material.
Background
The salt and nitrate materials are important industrial raw materials, are sourced from seawater or underground brine, meet quality standards after evaporation, crystallization, dehydration and drying, and are convenient to transport and use. Drying is an important production step.
At present, fluidized bed drying and airflow drying are widely applied to drying salt and nitre materials. The fluidized bed drying is that the materials are fluidized in the fluidized bed by hot air, and the materials are dried by directly contacting with the hot air, and a large amount of drying air is needed to be used as fluidizing air. The air flow drying is to take materials into a drying pipe by high-speed air flow for dehydration, a large amount of drying air is needed to carry the materials to move, a large amount of hot air is needed in the drying process, the energy consumption of the existing drying system is high, a large amount of tail gas is formed after drying, the environmental pollution is easily caused, and when wet salt and wet nitre with strong viscosity are dried, the wet salt and the wet nitre are easily adhered and hardened in a pipeline, the heat exchange efficiency is reduced, and even the production is interrupted.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to solve prior art energy consumption height, the tail gas volume is big, environmental pollution, and the easy bonding of strong viscidity material, the relatively poor problem of adaptability of dry material, a salt is provided, nitre material drying system, use rotary drying device to carry out material drying, the energy consumption is low, tail gas discharge is little, environmental protection is effectual, return material is carried out through circulation return material device, the adaptability to the wet material of different moisture contents has been improved, can effectively solve the desiccator that high moisture content material caused and glue the pipe, glue the wall problem, the adaptability and the operating stability of system have been strengthened.
The utility model discloses a solve the concrete technical scheme that above-mentioned technical problem adopted and be: a salt and saltpeter material drying system comprising:
the rotary drying device comprises a rotatable barrel, a riding wheel mechanism and a transmission mechanism, wherein the riding wheel mechanism supports the barrel, the transmission mechanism is used for driving the barrel to rotate, a plurality of groups of heat exchange tubes are arranged in the barrel, and an exhaust port is arranged at the discharge end of the rotary drying device and used for exhausting dried tail gas;
the circulating material returning device is connected with the discharge end and the feed end of the rotary drying device and is used for conveying and returning part of dried materials to be mixed with wet materials which are not dried;
the screening device is connected with the discharge end of the rotary drying device through a conveying mechanism and is used for screening the dried material;
the cooling device is connected with the screening device and is used for cooling the screened materials;
and the air inlet end of the dust removal recovery device is connected with the air outlet at the discharge end of the rotary drying device and is used for recovering materials in the tail gas and purifying the tail gas to be discharged into the atmosphere.
Optionally, the circulating material returning device is a material returning pipe arranged on the outer wall of the cylinder of the rotary drying device and used for conveying part of dried materials to the feeding end of the rotary drying device.
Optionally, the circulating material returning device is an independently arranged material returning screw conveyor, and the material returning screw conveyor conveys part of dried materials to the feeding end of the rotary drying device.
Optionally, the barrel adopts an inclined structure, and the height of the feeding end is higher than that of the discharging end.
Optionally, the heat exchange tubes are fixed in the cylinder through a support seat, each group of heat exchange tubes comprises two straight tubes which are axially parallel to each other and a plurality of circular tubes connected between the two straight tubes, and the circular tubes are arranged in a concentric circle manner in the cross section direction of the cylinder.
Optionally, the barrel is equipped with ejection of compact end plate near discharge end department, be equipped with the overflow mouth on the ejection of compact end plate, be equipped with height-adjustable's apron on the overflow mouth, be used for adjusting the size of overflow mouth, the bottom of ejection of compact end plate is equipped with the bin outlet that can close.
Optionally, the cylinder is axially divided into a feeding section and a drying section, the distance between the circular pipes in the feeding section is large, the distance between the circular pipes in the drying section is small, 1-2 groups of baffle plates are arranged in the drying section, the drying section is divided into 2-3 drying zones, each group of baffle plates consists of 6-10 baffle plates, and a gap for discharging materials after shutdown is formed between each baffle plate and the supporting seat.
Optionally, the screening device comprises a vibrating screen or a drum screen.
Optionally, the cooling device comprises a powder flow cooler, a rotary cooler or a fluidized bed cooler.
Optionally, the dust removal recovery device comprises a cyclone dust collector, a wet dust collector and an induced draft fan.
As described above, compared with the closest prior art, the present invention has at least the following beneficial effects:
1. the material is returned by adopting the circulating material returning device, so that the adaptability to wet materials with different water contents is improved, the problems of pipe sticking and wall sticking in the drier caused by the materials with high water contents are effectively solved, and the adaptability and the operation stability of the system are enhanced;
2. the material is dried by using a rotary drying device, and the tail gas emission amount generated by drying each ton of the same material is reduced by more than 80% compared with that generated by the traditional fluidized bed drying, so that the environment-friendly effect is good;
3. the heat energy utilization efficiency is high, the operation cost is low, and compared with the traditional fluidized bed drying, the steam consumption of the material with the same steam consumption per ton is reduced by 25-40%.
Drawings
FIG. 1 is a schematic diagram of the system in a self-circulation mode according to the present invention;
FIG. 2 is a schematic diagram of the system in the external circulation mode according to the present invention;
FIG. 3 is a schematic structural view of the cover plate and the discharge opening of the present invention;
fig. 4 is a schematic structural diagram of a retainer plate according to the present invention;
FIG. 5 is a schematic structural view of a heat exchange tube of the present invention;
FIG. 6 is a schematic view of the rotary drying device according to the present invention;
description of the element reference numerals
1 Rotary drying device
2 return pipe
3 material returning screw conveyer
4 screening device
5 Cooling device
6 dust removal recovery unit
11 barrel
12 riding wheel mechanism
13 heat exchange tube
14 drive mechanism
15 mixer
16 discharge screw conveyer
17 bucket elevator
18 discharge end plate
19 striker plate
61 cyclone dust collector
62 wet type dust collector
63 induced draft fan
131 straight pipe
132 grommet
133 support seat
181 overflow outlet
182 cover plate
183 discharge outlet
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
The structure, proportion, size, etc. of the present specification are only used to cooperate with the content disclosed in the specification, so as to be known and read by the people familiar with the technology, and not to limit the practical limit condition of the present invention, so the present invention has no technical essential meaning, and any structure modification, proportion relation change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
In the present embodiment, the first and second electrodes are,
referring to fig. 1, 5 and 6, the present invention provides a drying system for salt and saltpeter materials, which comprises a rotary drying device 1, a circulating material returning device, a screening device 4, a cooling device 5 and a dust removing and recycling device 6. The rotary drying device 1 comprises a rotatable barrel 11, a supporting wheel mechanism 12 and a transmission mechanism 14, wherein the supporting wheel mechanism 12 supports the barrel 11, the transmission mechanism 14 is used for driving the barrel 11 to rotate, a plurality of groups of heat exchange tubes 13 are arranged in the barrel 11, and an exhaust port is arranged at the discharge end of the rotary drying device 1 and used for exhausting tail gas after drying. The circulating material returning device is connected with the discharge end and the feed end of the rotary drying device 1 and used for conveying and returning part of dried materials to be mixed with wet materials which are not dried. The screening device 4 is connected with the discharge end of the rotary drying device 11 through a conveying mechanism and used for screening the dried materials. The cooling device 5 is connected with the screening device 4 and used for cooling screened materials. And the air inlet end of the dedusting recovery device 6 is connected with the air outlet of the discharge end of the rotary drying device and is used for recovering materials in the tail gas and purifying the tail gas and then discharging the tail gas into the atmosphere.
When materials such as salt, nitre are dried, the utility model discloses according to following method use:
1) mixing materials: the wet material and the dried portion of the returned material are mixed uniformly in the mixer 15, ready for drying.
2) Rotary drying: the materials enter the rotary drying device 1 after passing through the mixer 15, and the rotary drying device 1 comprises a cylinder body 11, a riding wheel mechanism 12 and a transmission mechanism 14. The barrel 11 has certain installation inclination, and the feed end highly is higher than the discharge end, riding wheel mechanism 12 supports barrel 11, drive mechanism 14 is used for driving barrel 11 rotates, and this embodiment adopts the motor to pass through drive mechanism 14 drives barrel 11 rotates. A plurality of groups of heat exchange tubes 13 are arranged in the cylinder body 11, the heat exchange tubes 13 are fixed in the cylinder body 11 through a support seat 133, each group of heat exchange tubes 13 comprises two straight tubes 131 which are axially parallel to each other and a plurality of ring tubes 132 connected between the two straight tubes 131, and the plurality of groups of ring tubes 132 are arranged in a concentric circle manner in the cross section direction of the cylinder body 11. The rotary drying device 1 can use high-temperature steam or heat conducting oil as a drying heat source, and the high-temperature steam is adopted to dry materials outside the pipe through the heat exchange pipe 13 in the rotary drying device 1. The material moves from the feeding end to the discharging end along with the rotation of the cylinder body 11, the temperature is gradually increased for dehydration, and the dried material is discharged from the discharging end of the cylinder body 11.
The materials are dried by using high-temperature steam entering the heat exchange tube 13 in the rotary drying device 1, the materials are in indirect contact with a drying heat source, collision and abrasion among material particles are light, the crystal form of the materials can be kept, and the product quality is improved. Meanwhile, air as moisture-carrying gas enters from the feeding end of the rotary drying device 1, and is discharged from the upper part of the discharging end of the rotary drying device 1 as tail gas after carrying evaporated moisture. Under the condition, the air is only used as the moisture-carrying gas, the air is not needed to drive the materials to move, the required air quantity is small, the tail gas is less, the energy loss is less, the heat utilization rate is high, the environmental pollution is not easy to cause, and the environment-friendly effect is good.
The wet gas that will carry in this embodiment heats the back reentrant rotary drying device 1 has improved the temperature of carrying wet gas, helps improving the drying efficiency of material.
3) And (3) circulating material returning: and returning part of the dried materials through a circulating material returning device, wherein the material returning amount can be adjusted according to wet materials with different water contents, and the wet materials are mixed in the material mixing step. Through reasonable setting of the material returning ratio, the drying of materials with different water contents can be adapted.
Adopt the mode of self-loopa to carry out the returning charge in this embodiment, the returning charge is through fixed setting up returning charge pipe 2 on the barrel 11 outer wall of rotary drying device 1 returns rotary drying device 1's feed end, returning charge pipe 2 is the rectangular pipe of heliciform distribution on the barrel 11 outer wall, the returning charge volume by returning charge pipe 2 with the control valve of barrel 11 junction is controlled, and returning charge and wet material are in mix in the rotary drying device 1.
Through setting up the circulation returning charge, improved the adaptability to the wet material of different moisture contents, can effectively solve the desiccator that high moisture content material caused and glue the pipe, glue the wall problem, strengthened the adaptability and the operating stability of system.
4) Screening and cooling: after being dried, the materials except the return materials are discharged from the rotary drying device 1, conveyed by a discharge screw conveyor 16 and a bucket elevator 17, enter a screening device 4 for screening, and enter a cooling device 5 after large-particle materials are removed. Screening plant 4 can adopt shale shaker or drum sieve, cooling device 5 can select for use powder to flow cooler, rotary cooler or fluidized bed cooler, and this embodiment adopts shale shaker 4 to sieve the material, adopts powder flow cooler 5 to cool down to the material after the drying, obtains required product.
The screening device 4 can be placed at a suitable position between the discharge port of the rotary drying device 1 and the cooling device 5 according to the arrangement requirement. In the embodiment, the vibrating screen 4 is directly connected with the powder flow cooler 5, so that the installation height can be reduced, and the civil engineering investment can be reduced. Meanwhile, material agglomeration in the drying process and the conveying process can be sufficiently removed, and blocking of the powder flow cooler 5 by lump materials is avoided.
5) Dust removal and recovery: the tail gas in the rotary drying step is discharged and then enters the dust removal recovery device 6, and the dust removal recovery device 6 comprises a cyclone dust collector 61, a wet dust collector 62 and an induced draft fan 63. The tail gas generated by drying is firstly subjected to primary dust removal through the cyclone dust collector 61, and the materials in the tail gas are separated by the cyclone dust collector 61 and then recovered as products, so that the waste and the pollution to the environment are reduced.
And the tail gas after primary dust removal is subjected to secondary dust removal through the wet dust remover 62, and then is pumped out by the induced draft fan 63 and discharged into the atmosphere. Fresh water, brine or filtered mother liquor can be used as the spray water of the wet dust collector 62 in the secondary dust collection, in this embodiment, the filtered mother liquor is used as the spray water of the wet dust collector 62, and the filtered mother liquor after dust collection can be recycled.
By adopting the mode, the pipeline can be prevented from being blocked by the washing water crystallization, the washing water does not need to be frequently replaced, and higher dust removal efficiency can be always kept. Meanwhile, materials carried in the tail gas can be recovered, and water pollution and resource waste are avoided.
In the present embodiment, the first and second electrodes are,
referring to fig. 2, in the embodiment, the material is returned by an external circulation manner, the circulation material returning device is a separately arranged material returning screw conveyor 3, and a part of the material dried by the rotary drying device 1 is sent to the mixer 15 by the material returning screw conveyor 3 to be mixed with the wet material.
In the present embodiment, the first and second electrodes are,
referring to fig. 5 and 6, the inside of the cylinder 11 is divided into a feeding section and a drying section along the axial direction, and the ring pipes 132 of the feeding section are spaced at a larger distance to prevent the wet material from adhering between the heat exchange pipes and improve the fluidity of the material. The small space between the ring pipes 132 in the drying section can increase the effective heat exchange area and increase the utilization rate of the volume.
In the present embodiment, the first and second electrodes are,
referring to fig. 1, 3 and 4, a discharge end plate 18 is disposed at a position close to a discharge end of the cylinder 11 of the rotary drying device 1, an overflow port 181 is disposed on the discharge end plate 18, and dried materials are discharged through the overflow port 181 on the discharge end plate 18. The overflow port 181 is provided with a cover plate 182 with adjustable height, which is used for adjusting the size of the overflow port. The bottom of the discharging end plate 18 is provided with a closable discharging opening 183 for discharging the materials in the rotary drying device 1 after shutdown, so that the materials are prevented from being stored and moisture-absorbed and hardened in the rotary drying device 1.
The drying section of the barrel body 11 is provided with 1-2 groups of material baffle plates 19, the drying section is divided into 2-3 areas, each group of material baffle plates 19 is divided into 6-10 blocks, and a discharge gap is reserved between the material baffle plates 19 and a supporting seat 133 for fixing the heat exchange tube 13 and used for discharging materials after shutdown.
In conclusion, the utility model has better adaptability to wet materials with different water contents, and can effectively solve the problems of pipe sticking and wall sticking caused by materials with high water content; the tail gas emission is small, the energy consumption is low, and the environmental protection effect is good; the heat energy utilization efficiency is high, and the operation cost is low. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A salt, nitre material drying system which characterized in that includes:
the rotary drying device comprises a rotatable barrel, a riding wheel mechanism and a transmission mechanism, wherein the riding wheel mechanism supports the barrel, the transmission mechanism is used for driving the barrel to rotate, a plurality of groups of heat exchange tubes are arranged in the barrel, and an exhaust port is arranged at the discharge end of the rotary drying device and used for exhausting dried tail gas;
the circulating material returning device is connected with the discharge end and the feed end of the rotary drying device and is used for conveying and returning part of dried materials to be mixed with wet materials which are not dried;
the screening device is connected with the discharge end of the rotary drying device through a conveying mechanism and is used for screening the dried material;
the cooling device is connected with the screening device and is used for cooling the screened materials;
and the air inlet end of the dust removal recovery device is connected with the air outlet at the discharge end of the rotary drying device and is used for recovering materials in the tail gas and purifying the tail gas and then discharging the purified tail gas into the atmosphere.
2. The salt and nitrate material drying system of claim 1, wherein the circulating material returning device is a material returning pipe arranged on the outer wall of the cylinder body of the rotary drying device and used for conveying part of dried materials to the feeding end of the rotary drying device.
3. The salt and nitrate material drying system of claim 1, wherein the circulating material returning device is an independently arranged material returning screw conveyor, and the material returning screw conveyor conveys part of dried materials to the feeding end of the rotary drying device.
4. The salt and nitrate material drying system of claim 1, wherein the barrel is of an inclined structure, and the height of the feeding end is higher than that of the discharging end.
5. The salt and nitrate material drying system according to claim 1, wherein the heat exchange tubes are fixed in the cylinder through a support seat, each group of heat exchange tubes comprises two straight tubes which are axially parallel to each other and a plurality of circular tubes connected between the two straight tubes, and a plurality of groups of circular tubes are arranged in a concentric circle manner in the cross-sectional direction of the cylinder.
6. The salt and nitrate material drying system of claim 1, wherein the barrel is provided with a discharge end plate near the discharge end, the discharge end plate is provided with an overflow port, the overflow port is provided with a cover plate with adjustable height for adjusting the size of the overflow port, and the bottom of the discharge end plate is provided with a closable discharge port.
7. The salt and nitrate material drying system according to claim 5, wherein the cylinder is axially divided into a feeding section and a drying section, the distance between the circular pipes in the feeding section is large, the distance between the circular pipes in the drying section is small, the drying section is provided with 1-2 groups of baffle plates, the drying section is divided into 2-3 drying zones, each group of baffle plates consists of 6-10 baffle plates, and a gap for discharging materials after shutdown is reserved between each baffle plate and the supporting seat.
8. The salt and nitrate material drying system of claim 1, wherein the screening device comprises a vibrating screen or a trommel screen.
9. The salt and nitrate material drying system of claim 1, wherein the cooling device comprises a powder flow cooler, a rotary cooler, or a fluidized bed cooler.
10. The salt and nitrate material drying system of claim 1, wherein the dust removal and recovery device comprises a cyclone, a wet dust collector and an induced draft fan.
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| CN202021492586.5U CN213020681U (en) | 2020-07-27 | 2020-07-27 | Salt, nitre material drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107940937A (en) * | 2017-12-19 | 2018-04-20 | 北京中矿环保科技股份有限公司 | Coal slime contact drying system |
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2020
- 2020-07-27 CN CN202021492586.5U patent/CN213020681U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107940937A (en) * | 2017-12-19 | 2018-04-20 | 北京中矿环保科技股份有限公司 | Coal slime contact drying system |
| CN107940937B (en) * | 2017-12-19 | 2023-04-18 | 光大清洁技术股份有限公司 | Indirect drying system of coal slime |
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