CN112696879A - Magnesium chloride hexahydrate drying device - Google Patents
Magnesium chloride hexahydrate drying device Download PDFInfo
- Publication number
- CN112696879A CN112696879A CN202110087054.6A CN202110087054A CN112696879A CN 112696879 A CN112696879 A CN 112696879A CN 202110087054 A CN202110087054 A CN 202110087054A CN 112696879 A CN112696879 A CN 112696879A
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- magnesium chloride
- drying
- chloride hexahydrate
- drying device
- drying cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Sustainable Development (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a magnesium chloride hexahydrate drying device which comprises a drying cylinder, supporting partition plates, exhaust pipes, air supply pipes and microwave heaters, wherein a plurality of supporting partition plates are installed in the drying cylinder, blanking holes are formed in each supporting partition plate, the blanking holes in adjacent supporting partition plates are sequentially staggered, the exhaust pipes, the air supply pipes and the microwave heaters are installed on the drying cylinder on the outer side of each supporting partition plate, and the thicknesses of the microwave heaters and the magnesium chloride hexahydrate on the supporting partition plates are equal. The microwave heating device can uniformly heat the raw materials, simultaneously keeps the negative pressure state in the drying cylinder under the action of the air exhaust pump so as to quickly extract water generated by heating and transmit the water out of the drying cylinder under the action of the negative pressure so as to ensure the drying efficiency of the magnesium chloride hexahydrate, reduces the drying cost because the drying temperature and the pressure in the drying cylinder are reduced compared with the prior art, and simultaneously saves a fan from being arranged in the drying cylinder so as to further save the energy consumed by drying.
Description
Technical Field
The invention relates to the field of magnesium chloride production equipment, in particular to a magnesium chloride hexahydrate drying device.
Background
Magnesium chloride is an inorganic substance and is a colorless flaky crystal, and magnesium chloride can form hexahydrate, namely magnesium chloride hexahydrate containing six crystal waters. Drying is needed after the magnesium chloride is mined, and the anhydrous magnesium chloride used in industry is prepared. The existing drying of magnesium chloride hexahydrate adopts external heating type drying, namely natural gas is mixed into air, the air is heated to 380 ℃ and is sent into a drying container, the high pressure of 7000Pa is kept in the drying container, 10 layers of fluidized beds are distributed in the drying container along the vertical direction, the interval between every two adjacent fluidized beds is 1m, a magnesium chloride hexahydrate raw material is placed on the fluidized beds, in order to increase the contact area between the magnesium chloride hexahydrate and hot air, a fan is arranged below the fluidized beds, the fan also needs to make the raw material move downwards layer by layer until the raw material falls into the bottom of the container, the fan lifts the magnesium chloride hexahydrate on the fluidized beds to make the magnesium chloride hexahydrate raw material contact with the hot air, water in the magnesium chloride hexahydrate is evaporated by the hot air, hydrogen chloride gas is added in the evaporation process of the magnesium chloride hexahydrate to absorb oxygen in the raw material, then water vapor is discharged for cooling, the cooling temperature is less than 7 ℃ for condensing the water in the waste, and separating water from the waste gas, and introducing the separated hydrogen chloride gas into the drying container again for recycling.
However, the existing magnesium chloride hexahydrate has extremely serious drying energy consumption and limited yield, the contact area of hot air and the magnesium chloride hexahydrate is limited after the hot air enters a drying container, and the drying effect is poor, so that a fan needs to be added to lift the magnesium chloride hexahydrate and increase the contact area of the hot air, but the fan needs to consume extremely large energy due to more raw materials on a fluidized bed; meanwhile, the drying effect is poor, and the drying time needs to be increased, so that the yield is limited. In addition, what adopt is that external heating formula is dried, the stoving container can give off partly heat, and final steam cooling needs cool off the air, and in order to guarantee drying efficiency, steam is in getting into the stoving container constantly, also is continuous discharge when discharging at last, and the cold source quantity that leads to the digestion is also big, and current cold source is the liquid nitrogen, but the quantity of hot-air is big, and is also very serious to the consumption of cold source, and the above-mentioned reason leads to the manufacturing cost of magnesium chloride hexahydrate to be high.
Disclosure of Invention
The invention aims to provide a magnesium chloride hexahydrate drying device which can effectively control the production cost of magnesium chloride hexahydrate, save energy and simultaneously can produce more magnesium chloride products.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a magnesium chloride hexahydrate drying device, includes a stoving section of thick bamboo, hollow sleeve, supporting diaphragm, blast pipe, air supply pipe and microwave applicator, a stoving section of thick bamboo is for going into down the structure, a stoving section of thick bamboo middle part cover is equipped with hollow sleeve, installs the annular supporting diaphragm of polylith between a stoving section of thick bamboo and the hollow sleeve, all processes on every supporting diaphragm and has the blanking hole, and the blanking hole on the adjacent annular supporting diaphragm staggers in proper order, installs blast pipe, air supply pipe and microwave applicator on the stoving section of thick bamboo in the adjacent supporting diaphragm outside, the blast pipe is located the interior top between the adjacent supporting diaphragm, is connected with the aspiration pump on the blast pipe, the height such as magnesium chloride hexahydrate thickness on microwave applicator and the supporting diaphragm, the air supply pipe stretches into the interior bottom between the adjacent baffle, air supply pipe and hydrogen chloride.
The material dropping hole is provided with a conical leakage hopper, the top of the leakage hopper is aligned with the surface of the supporting partition plate, and the bottom of the leakage hopper extends into the lower part of the exhaust pipe.
And the supporting partition plate, the drying cylinder and the hollow sleeve are all processed with a layer of anti-corrosion coating.
The microwave heaters are arranged on the drying cylinders on the outer sides of the adjacent partition plates uniformly in an annular shape.
The heating temperature of the microwave heater is 200-280 ℃.
The air pump keeps the interior of the drying cylinder at 1-5 Pa.
The outlet end of the exhaust pipe is connected with a cooling chamber, and the temperature of the cooling chamber is less than 7 degrees.
The drying cylinder at the microwave heater is made of ceramic materials, so that microwave reflection is prevented.
The magnesium chloride hexahydrate drying device provided by the invention has the beneficial effects that:
(1) the microwave heater is used, so that the raw materials can be uniformly heated, and meanwhile, under the action of the air extraction pump, the drying cylinder is kept in a negative pressure state, so that water generated by heating can be quickly extracted out and is transmitted out of the drying cylinder under the action of the negative pressure, the drying efficiency of the magnesium chloride hexahydrate is ensured, the drying cost is reduced because the drying temperature and the pressure in the drying cylinder are reduced compared with the prior art, and meanwhile, a fan is omitted from being arranged in the drying cylinder, so that the energy consumed by drying is further saved;
(2) the negative pressure is kept in the drying cylinder through the exhaust fan, and no external air enters, so that the quantity of discharged waste gas is reduced, the cold source consumption in the waste gas cooling process is reduced, and the cost of the cold source is saved;
(3) by arranging the leakage hopper and extending the leakage hopper into the lower part of the exhaust pipe, water vapor generated by heating on the lower supporting partition plate can be prevented from being transmitted to the last time, the water vapor is prevented from flowing between the supporting partition plates, and the drying efficiency is ensured;
(4) through setting up a plurality of microwave applicator, after one of them microwave applicator broke down, other microwave applicator still can normally work, have avoided the stoving process to shut down, compare with current stoving and have guaranteed production efficiency, if one of them breaks down of fan of the magnesium chloride hexahydrate of uplifting among the current stoving process, then can lead to whole stoving process to shut down.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram provided in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of adjacent separators according to an embodiment of the present invention.
Reference numerals: 1. a drying drum; 2. a hollow sleeve; 3. supporting the partition plate; 31. a blanking hole; 4. a hopper; 5. an exhaust pipe; 6. an air pump; 7. a gas supply pipe; 8. a microwave heater; 9. and a cooling chamber.
Detailed Description
The existing magnesium chloride hexahydrate drying method is that raw materials are sent into a drying container through a lifting machine, the pressure in the drying container is kept at 7000Pa through a pressurizing fan, multiple layers of fluidized beds are sequentially arranged in the drying container from top to bottom, the distance between every two adjacent fluidized beds is 1m, the adjacent fluidized beds are arranged in a staggered manner, a fan which enables the magnesium chloride hexahydrate to be lifted and fall into the lower fluidized bed is arranged at the bottom of each fluidized bed, a heat source of the drying container is hot air, the hot air is obtained by mixing natural gas into air and igniting the natural gas, the temperature of the hot air needs to be heated to 380 ℃, then the lifted magnesium chloride hexahydrate is dried by the hot air, therefore, the magnesium chloride hexahydrate is dried under high pressure and high temperature, the dried water vapor content is large, because an exhaust pipe 5 is arranged at the top of the drying container, the water vapor generated by evaporation reacts with the added hydrogen chloride gas, the hydrochloric acid has strong corrosivity to the fan, and the fan needs to be replaced generally about three months, so that the cost of the fan is greatly input.
In the production process, once a fan fails due to hydrochloric acid corrosion, the whole system needs to be stopped to discharge the failure and then continue to produce, so that the production efficiency is low; the flowing water magnesium chloride on each fluidized bed is more in quantity during drying, the fan needs to lift the magnesium chloride, the required power is larger, the used electric quantity is larger, a large amount of cost investment is increased, the water vapor discharged by the exhaust pipe 5 contains hydrogen chloride gas and water vapor, the hydrogen chloride gas reacts with the water to generate hydrochloric acid, therefore, the water in the water vapor needs to be separated, the most convenient method for separating the water vapor is to directly cool the water vapor so as to condense the water vapor, but the temperature of the discharged water vapor is about 380 ℃, the quantity of cold sources required by cooling is large, and the hot air continuously flows, so that the quantity of the consumed cold sources is large, the hot air is adopted for drying, wherein the drying container can emit partial heat, the heat utilization rate of drying by utilizing air contact is lower, most of the hot air is discharged without participating in drying, the energy is directly consumed by cooling through the cold source, and the cost for producing the magnesium chloride is high.
Examples
Based on the above problems, the present patent proposes a new magnesium chloride hexahydrate drying device, which improves the utilization rate of heat energy, and reduces the cost investment, so as to increase the yield of magnesium chloride, and the specific scheme is as shown in fig. 1 and fig. 2, the magnesium chloride hexahydrate drying device provided in this embodiment includes a drying cylinder 1, a hollow sleeve 2, a supporting partition plate 3, an exhaust pipe 5, an air supply pipe 7 and a microwave heater 8, the drying cylinder 1 is of an up-in and down-out structure, the hollow sleeve 2 is sleeved in the middle of the drying cylinder 1, a plurality of annular supporting partition plates 3 are installed between the drying cylinder 1 and the hollow sleeve 2, since the cost of total replacement of equipment is large, we improve on the existing drying container, the fluidized bed is replaced by the supporting partition plates 3, therefore, the number of the supporting partition plates 3 is 10, each supporting partition plate 3 is provided with a blanking hole 31, the feeding device is characterized in that the blanking hole 31 is provided with a conical leakage hopper 4, the top of the leakage hopper 4 is aligned with the surface of the supporting partition plate 3, and the magnesium chloride hexahydrate on the adjacent supporting partition plate 3 flows to the lower layer through the leakage hopper 4 under the condition of gravity, so that the process that a fan drives the magnesium chloride hexahydrate to move is omitted, and the cost input of the fan is reduced.
After the fan has been removed from, blanking hole 31 on the adjacent annular supporting baffle 3 staggers in proper order, makes the raw materials can fall into lower floor's supporting baffle 3 from blanking hole 31, installs blast pipe 5, air supply pipe 7 and microwave heater 8 on the stoving section of thick bamboo 1 in the adjacent supporting baffle 3 outside, blast pipe 5 is located the interior top between the adjacent supporting baffle 3, and 4 bottoms of hopper stretch into blast pipe 5 below, and its purpose is in order to prevent to dry the steam that produces between the adjacent supporting baffle 3 and is detained in a stoving section of thick bamboo 1, reduces the formation volume of hydrochloric acid to play the effect of extension stoving section of thick bamboo 1 life-span.
The exhaust pipe 5 is connected with an air pump 6, the air pump 6 keeps 1-5 Pa in the drying cylinder 1, and the air pump 6 enables the drying cylinder 1 to generate 1-5 Pa micro negative pressure so as to suck out dried water vapor and reduce the detention time of the water vapor in the drying cylinder 1.
The microwave heaters 8 are multiple, the multiple microwave heaters 8 are uniformly arranged on the drying cylinder 1 on the outer side of the adjacent partition plates in an annular mode, in order to ensure the work of the microwave heaters 8, the drying cylinder 1 at the position of the microwave heaters 8 is made of ceramic materials, if the microwave heaters 8 break down in the using process, the rest microwave heaters 8 can also work normally, the shutdown of the whole production system is not caused, the processing efficiency is ensured, the height of the microwave heaters 8 is as high as the thickness of the magnesium chloride hexahydrate on the support partition plates 3, the heating temperature of the microwave heaters 8 is 200-280 ℃, the working principle of the microwave heaters 8 is that water in the magnesium chloride hexahydrate is shaken out through microwaves, and water vapor is pumped out of the drying cylinder 1 under the condition of micro negative pressure, so that the temperature consumption is less, the utilization rate of heat energy is obviously improved, the air supply pipe 7 extends into the inner bottom between the adjacent support partition plates 3, the gas supply pipe 7 is communicated with hydrogen chloride gas, and oxygen in the raw materials can be absorbed through the hydrogen chloride gas, so that the step essential for drying the hydrogen chloride hexahydrate is realized.
In order to prolong the service life of the drying device, the supporting partition plate 3, the drying cylinder 1 and the hollow sleeve 2 are all processed with a layer of anti-corrosion coating, and the corrosion of hydrochloric acid to the drying device is reduced through the anti-corrosion coating.
The outlet end of the exhaust pipe 5 is connected with a cooling chamber 9, the temperature of the cooling chamber 9 is less than 7 degrees, a cold source used by the cooling chamber 9 is liquid nitrogen, new air is not added in the patent, and the drying is carried out by the temperature generated by a microwave heater 8, so that the discharge amount of waste gas is reduced by times compared with the prior scheme, and the cold energy consumed by the cold source is also greatly reduced; meanwhile, the temperature of the microwave heater 8 is obviously reduced from the temperature of microwave drying in the prior art, so that the consumption of a cold source is further reduced.
The using method of the invention is as follows:
when the device is used, the magnesium chloride hexahydrate raw material is placed into the supporting partition plate 3 from the top of the drying cylinder 1, the microwave heater 8 positioned on the upper layer sends microwaves to dry the raw material, water vapor generated by drying is discharged from the exhaust pipe 5, during drying, the gas supply pipe 7 sends hydrogen chloride gas into the drying cylinder 1, along with the increase of the magnesium chloride hexahydrate raw material, the raw material flows from the hopper 4 on the supporting partition plate 3 to the supporting partition plate 3 on the lower layer along with gravity, when the raw material flows to the supporting partition plate 3 on the lower layer, the microwave heater 8 on the lower layer also sends microwaves to dry the raw material, and the raw material continuously falls on the supporting partition plate 3 until the bottom of the drying cylinder 1 to prepare the anhydrous magnesium chloride.
Compared with the prior art, this patent has reduced the input of fan, and just be enough to satisfy the electric quantity that microwave heater 8 consumed for the electric quantity that the fan provided, has removed the step of sneaking into the natural gas in the air simultaneously from, has saved the cost of natural gas, and is corresponding, has saved the cold source cost that follow-up cooling waste gas consumed. In addition, the patent does not need to worry about the shutdown in the production process, thereby ensuring the yield of the magnesium chloride. Overall, cost savings are achieved while increasing throughput.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention. It should be noted that structures or components illustrated in the drawings are not necessarily drawn to scale, and descriptions of well-known components and processing techniques and procedures are omitted to avoid unnecessarily limiting the invention.
Claims (8)
1. The utility model provides a magnesium chloride hexahydrate drying device which characterized in that: including a stoving section of thick bamboo, hollow sleeve, supporting diaphragm, blast pipe, air supply pipe and microwave heater, a stoving section of thick bamboo is for going into down the structure, a stoving section of thick bamboo middle part cover is equipped with hollow sleeve, installs the annular supporting diaphragm of polylith between a stoving section of thick bamboo and the hollow sleeve, all processes on every supporting diaphragm and has the blanking hole, and the blanking hole on the adjacent annular supporting diaphragm staggers in proper order, installs blast pipe, air supply pipe and microwave heater on the stoving section of thick bamboo in the adjacent supporting diaphragm outside, the blast pipe is located the interior top between the adjacent supporting diaphragm, is connected with the aspiration pump on the blast pipe, the height such as hexahydrate magnesium chloride thickness on microwave heater and the supporting diaphragm, the air supply pipe stretches into the interior bottom between the adjacent baffle, air supply pipe and hydrogen chloride gas intercommunication.
2. The magnesium chloride hexahydrate drying device of claim 1, wherein: the material dropping hole is provided with a conical leakage hopper, the top of the leakage hopper is aligned with the surface of the supporting partition plate, and the bottom of the leakage hopper extends into the lower part of the exhaust pipe.
3. The magnesium chloride hexahydrate drying device of claim 1, wherein: and the supporting partition plate, the drying cylinder and the hollow sleeve are all processed with a layer of anti-corrosion coating.
4. The magnesium chloride hexahydrate drying device of claim 1, wherein: the microwave heaters are arranged on the drying cylinders on the outer sides of the adjacent partition plates uniformly in an annular shape.
5. The magnesium chloride hexahydrate drying device of claim 1, wherein: the heating temperature of the microwave heater is 200-280 ℃.
6. The magnesium chloride hexahydrate drying device of claim 1, wherein: the air pump keeps the interior of the drying cylinder at 1-5 Pa.
7. The magnesium chloride hexahydrate drying device of claim 1, wherein: the outlet end of the exhaust pipe is connected with a cooling chamber, and the temperature of the cooling chamber is less than 7 degrees.
8. The magnesium chloride hexahydrate drying device of claim 1, wherein: the drying cylinder at the microwave heater is made of ceramic materials, so that microwave reflection is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110087054.6A CN112696879A (en) | 2021-01-22 | 2021-01-22 | Magnesium chloride hexahydrate drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110087054.6A CN112696879A (en) | 2021-01-22 | 2021-01-22 | Magnesium chloride hexahydrate drying device |
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| Publication Number | Publication Date |
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| CN112696879A true CN112696879A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110087054.6A Withdrawn CN112696879A (en) | 2021-01-22 | 2021-01-22 | Magnesium chloride hexahydrate drying device |
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| CN (1) | CN112696879A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294934A (en) * | 2021-12-30 | 2022-04-08 | 江苏道明化学有限公司 | Dicumyl peroxide drying process |
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2021
- 2021-01-22 CN CN202110087054.6A patent/CN112696879A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294934A (en) * | 2021-12-30 | 2022-04-08 | 江苏道明化学有限公司 | Dicumyl peroxide drying process |
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Application publication date: 20210423 |