CN115523729A - Continuous drying device and drying method for lignite - Google Patents
Continuous drying device and drying method for lignite Download PDFInfo
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- CN115523729A CN115523729A CN202211221293.7A CN202211221293A CN115523729A CN 115523729 A CN115523729 A CN 115523729A CN 202211221293 A CN202211221293 A CN 202211221293A CN 115523729 A CN115523729 A CN 115523729A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
- F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
- F26B11/0486—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements being held stationary, e.g. internal scraper blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0495—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for drying by electro-magnetic means, e.g. radiation, microwaves
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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
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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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
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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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
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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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
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
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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
- F26B25/04—Agitating, stirring, or scraping devices
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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
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a continuous lignite drying device and a continuous lignite drying method, belongs to the technical field of lignite drying, and solves the problems that in the prior art, a lignite drying device cannot reasonably distribute drying energy, and manual viscosity breaking is needed to cause interruption of a production flow. The microwave tail gas circulation device comprises a feeding mechanism, a rolling mechanism, a microwave generating mechanism, a discharging mechanism and a tail gas circulation mechanism, wherein the feeding mechanism is respectively connected with a rolling mechanism and the tail gas circulation mechanism, the microwave generating mechanism is arranged in the rolling mechanism, and the rolling mechanism is connected with the tail gas circulation mechanism through the discharging mechanism. The drying device has the advantages that the low-temperature pre-drying area and the high-temperature intensified drying area of the drying device optimize drying energy configuration; the strength of the lignite particles is ensured, the condition of particle crushing can be effectively relieved, and the spontaneous combustion phenomenon of the lignite dry powder is prevented; the microwave generating mechanism enables the wall-sticking materials to generate cracks and burst, so that the wall-sticking materials can fall off from the wall of the roller quickly, the wall-sticking materials are removed under the state of no stopping, the efficiency of the drying device is improved, and the continuous operation of the drying process of the moisture-containing lignite is ensured.
Description
Technical Field
The invention belongs to the technical field of lignite drying, and particularly relates to a lignite continuous drying device and a lignite continuous drying method.
Background
Lignite accounts for about 13% of the total amount of coal resources in China, not only is the mining cost low, but also the reaction activity is high, and the lignite is mainly used for power generation and is also an important chemical raw material.
However, the water content of the lignite is up to 30% -60%, and the lignite needs to be dried in order to improve the heat efficiency of a mechanism, reduce the emission of greenhouse gases and realize the efficient quality-improving comprehensive utilization of the lignite. However, the high moisture content brown coal is soft in texture and easy to stick to the wall in the drying process of the roller, so that the thermal efficiency of the drying mechanism is reduced, the carbon emission is increased, the roller needs to be stopped for manual cleaning, the operation difficulty is high, the production flow needs to be interrupted, and the production efficiency is low. In addition, the heat distribution of the drying medium in the existing roller dryer is not matched with the heat required by wet materials, and the heat efficiency of the mechanism is lower.
Therefore, a continuous lignite drying device and a continuous lignite drying method which can reasonably distribute drying energy and automatically break viscosity so as to continuously operate are urgently needed.
Disclosure of Invention
In view of the above analysis, the embodiments of the present invention are directed to providing a continuous lignite drying apparatus and a drying method, so as to solve the problems of the prior art that a lignite drying apparatus cannot reasonably distribute drying energy and needs manual de-bonding, which causes interruption of a production process.
The invention is mainly realized by the following technical scheme:
the utility model provides a continuous drying device of brown coal, includes feed mechanism, rolls mechanism, microwave generation mechanism, discharge mechanism and tail gas circulation mechanism, and feed mechanism is connected with roll-over mechanism and tail gas circulation mechanism respectively, and microwave generation mechanism sets up in rolling mechanism, and roll-over mechanism passes through discharge mechanism and tail gas circulation mechanism and connects.
Further, the feed mechanism includes a feed inlet.
Further, the rolling mechanism includes a first roller, a second roller, and a roller connector.
Furthermore, the rolling mechanism is arranged obliquely, and the included angle between the rolling mechanism and the ground is 5 degrees.
Furthermore, a plurality of lifting plates are arranged in the first roller and the second roller.
Further, the material raising plate is arranged on the inner walls of the first roller and the second roller.
Further, the height of the material raising plate is 0.3 meter.
Furthermore, a low-temperature pre-drying area is arranged in the first roller, and the initial temperature is 80 ℃.
Furthermore, a high-temperature intensified drying area is arranged in the second roller, and the initial temperature is 180-190 ℃.
A drying method of a lignite continuous drying device comprises the following steps:
step 1: feeding and feeding low-temperature heat carrier gas;
and 2, step: pre-drying lignite at low temperature;
and step 3: conveying and reheating the lignite in the middle;
and 4, step 4: high-temperature intensified drying of lignite;
and 5: recycling the tail gas;
step 6: discharging.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) The drying device has the advantages that the drying temperature of the drum low-temperature pre-drying area and the drying temperature of the drum high-temperature intensified drying area are respectively matched with the drying characteristics, and the drying energy configuration is optimized.
(2) According to the drying device, the core drying is respectively provided with the roller low-temperature pre-drying area and the roller high-temperature intensified drying area, the rotating speeds of the rollers in the two areas are different, the particle crushing condition can be effectively relieved while the strength of the lignite particles is ensured, the content of fine particle dust of the product is low, and the spontaneous combustion or deflagration phenomenon of the lignite dried powder can be prevented.
(3) The drying device is provided with the tail gas circulating mechanism, the discharged high-temperature tail gas is preheated by the heat exchanger for the hot carrier gas with high-temperature intensified drying, then is purified by the cyclone dust collector, and returns to the low-temperature pre-drying stage to be used as the low-temperature hot carrier gas for heating materials, so that the overall thermal efficiency is improved.
(4) The drying device is provided with an inclined angle, and the high moisture-containing lignite enters the low-temperature pre-drying area from a higher material and a low-temperature hot carrier gas inlet. When the equipment is operated, the roller continuously rolls, the materials slowly move forward from the low-temperature pre-drying area of the roller, enter the high-temperature intensified drying area through the roller connector and then are discharged from the discharge hole, and therefore the continuous operation of the multi-section continuous drying and viscosity breaking device for the high-moisture lignite roller is realized.
(5) The microwave generating mechanism of the drying device can perform microwave radiation on materials adhered to the wall of the drum, wherein the adhered materials are wet materials and contain a large amount of moisture inside. The water is vaporized instantly under the action of the microwave field to generate a large amount of water vapor, and high-pressure steam is generated in the adhered materials. The wall-sticking materials can generate cracks and can quickly fall off from the wall of the roller when the wall-sticking materials burst, so that the wall-sticking materials are removed without stopping, the efficiency of the drying device is improved, and the smooth conveying of the moisture-containing lignite in the hot air drying process of the roller is ensured.
(6) The air outlet of the drying device is aligned with the second microwave generator, the airflow sprayed out from the air outlet directly blows the second microwave generator to take away the lignite particles attached to the second microwave generator, and the microwave generating mechanism is ensured to work efficiently.
In the invention, the above technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view showing an internal structure of the drum connector;
FIG. 3 is a schematic flow diagram of the drying method of the present invention.
Reference numerals:
1-a feed inlet; 2-a first drum; 3-a second drum; 4-a roller connector; 5-a material raising plate; 6-an air inlet; 7-air outlet; 8-a first microwave generator; 9-a second microwave generator; 10-a discharge hole; 11-an exhaust port; 12-a heat exchanger; 13-a heater; 14-a dust remover; 15-a first gas path; 16-a second gas circuit; 17-a third air path.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
Example 1
One embodiment of the present invention, as shown in fig. 1, discloses a continuous drying device for lignite (hereinafter referred to as drying device), which comprises a feeding mechanism, a rolling mechanism, a microwave generating mechanism, a discharging mechanism and a tail gas circulating mechanism, wherein the feeding mechanism is respectively connected with a rolling mechanism and the tail gas circulating mechanism, the microwave generating mechanism is arranged in the rolling mechanism, and the rolling mechanism is connected with the tail gas circulating mechanism through the discharging mechanism. The drying device is suitable for drying the lignite with the water content of 30-60% by mass.
Preferably, the feeding mechanism comprises a feeding hole 1, and the feeding hole 1 is used for feeding lignite particles and guiding hot carrier gas conveyed by the tail gas circulating mechanism into the rolling mechanism.
Specifically, the particle size of the lignite particles is less than 25 mm, and the mass ratio of the water content is 60% at most. Lignite particles are conveyed from the coal bunker to the feed inlet 1 through the conveying belt, meanwhile, low-temperature hot carrier gas conveyed by the tail gas circulating mechanism is conveyed to the feed inlet 1, the lignite particles and the low-temperature hot carrier gas simultaneously enter the rolling mechanism through the feed inlet 1, and the low-temperature hot carrier gas is 90 ℃.
Preferably, the tumbling mechanism includes a first drum 2, a second drum 3, and a drum connector 4.
Preferably, the rolling mechanism is arranged obliquely, and the included angle between the rolling mechanism and the ground is 5 degrees. The lignite particles are transferred from the first drum 2 to the second drum 3 under the influence of gravity.
Preferably, a plurality of lifting blades 5 are arranged in the first roller 2 and the second roller 3, the lifting blades 5 are arranged on the inner walls of the first roller 2 and the second roller 3, and the height of each lifting blade 5 is 0.3 m. When the first roller 2 and the second roller 3 roll, the lignite particles roll under the action of the material raising plate 5, so that the lignite particles are fully contacted with the low-temperature hot carrier gas.
Preferably, a low-temperature pre-drying area is arranged in the first roller 2, the drying stage is a low-temperature pre-drying stage, the initial temperature of the stage is 80 ℃, and the rotating speed of the first roller 2 is 8 revolutions per minute. In the stage, the temperature of the lignite particles is rapidly increased to 80 ℃ from room temperature, free water existing in fracture and macropore structures in the lignite particles is rapidly removed, and the residence time of the lignite particles in a low-temperature pre-drying area is 10 minutes.
Preferably, the inside of the second drum 3 is a high-temperature intensified drying zone, and the drying stage is a high-temperature intensified drying stage, which mainly removes pore water existing in the internal pores, the interaction force of the partial water and the coal is strong, and the removing process is driven by the internal steam pressure. High-temperature drying is adopted in the stage, so that the internal steam pressure is improved, the diffusion process of moisture in the particles is strengthened, and the drying rate is improved. However, the steam pressure inside the drum is too high, and the particles can be broken under the action of high steam pressure, so that the drum at the stage adopts low rotating speed, the action of mechanical force is weakened, and the particles are prevented from being crushed excessively. The initial temperature of this stage is 180 ℃ to 190 ℃ and the rotational speed of the second drum 3 is 3 rpm.
As shown in fig. 2, the drum connector 4 includes an air inlet 6, an air outlet 7, and a hollow portion.
Preferably, the roller connectors 4 connect the first roller 2 and the second roller 3, respectively. Lignite particles can pass through the hollow part from the first drum 2 to the second drum 3.
Preferably, the gas inlet 6 is connected with an exhaust gas circulating mechanism, the opening of the gas outlet 7 is arranged in the hollow part, and the exhaust gas circulating mechanism conveys high-temperature hot carrier gas to the rolling mechanism through the gas inlet 6 and the gas outlet 7.
Preferably, the high temperature hot carrier gas temperature is 200 ℃.
In the low-temperature pre-drying stage, the strength of the lignite particles is high, the contact effect of the particles and hot air flow can be enhanced by adopting a high rotating speed, heat conduction is facilitated, and free water in surface cracks and macropores of the lignite particles can be rapidly removed. In the stage of forced drying, the rotating speed of the second roller 3 is 3 revolutions per minute, and the rotating speed is slowed down, so that the lignite particles can be ensured to be fully contacted with hot carrier gas, and the spontaneous combustion of the lignite particles can be effectively avoided because the temperature of the carrier gas is lower than the ignition point of the lignite on the premise of ensuring the drying efficiency. The humidity of the lignite particles is reduced in the stage, the lignite particles are loose in structure and are easy to break under the action of external force to generate dust. If the carbon-containing dust reaches 150-1500g/m 3 And 10-15% of the carbon-containing particles have a particle size of less than 80 microns, and deflagration can occur in a hot air environment. The second drum 3 adopts a low rotating speed, so that the damage of the lifting plate 5 and the drum rolling to the integrity of lignite particles is weakened on the premise of ensuring the gas-solid contact effect, the dust is reduced, and the detonation of lignite is effectively avoided.
Preferably, the microwave generating means comprises a first microwave generator 8 and a second microwave generator 9, as shown in fig. 1, the first microwave generator 8 is disposed on the feeding means, as shown in fig. 2, the second microwave generator 9 is disposed on the drum connector 4, the air outlet 7 is aligned with the second microwave generator 9, the hot air ejected from the air outlet 7 directly blows the second microwave generator 9, and takes away the lignite particles adhered on the second microwave generator 9, thus ensuring the efficient operation of the second microwave generator 9.
When the drying device provided by the invention operates, the inner wall of the rolling mechanism can be adhered with moisture-containing lignite. When the thickness of the adhered wet lignite exceeds 0.15 m, the rolling effect of the material lifting plate 5 on lignite particles is weakened, the microwave generating mechanism needs to be opened at the moment, the internal temperature of the lignite adhered to the wall of the roller exceeds 100 ℃ instantly, the internal moisture is quickly vaporized to generate high-pressure steam, the lignite particles are cracked instantly and separated from the wall of the roller, so that the viscosity breaking effect of the lignite is achieved, the inner wall of the rolling mechanism is automatically cleaned, the wall-adhered materials are removed under the non-stop state, the efficiency of the drying device is improved, and the smooth conveying of the wet lignite in the hot air drying process of the roller is ensured.
Preferably, the discharge mechanism comprises a discharge port 10 and an exhaust port 11.
The dried lignite particles are discharged from a discharge port 10, and the tail gas is discharged from an exhaust port 11. The water content of the lignite is less than 15% by mass, the temperature of the tail gas is 130 ℃, and the tail gas carries pulverized coal particles.
Preferably, the off-gas circulation mechanism includes a heat exchanger 12, a heater 13, a dust separator 14, a first gas line 15, a second gas line 16, and a third gas line 17.
Preferably, a heat exchanger 12 is connected to the exhaust port 11, the heater 13, and the dust collector 14, respectively, and the heat exchanger 12 can preheat the air delivered to the intake port 6 using the residual heat of the exhaust gas.
Preferably, the heat exchanger 12 includes an inner air passage and an outer air passage (not shown), the inner air passage being disposed within the outer air passage.
Preferably, the starting point of the first gas path 15 is the exhaust port 11, and the exhaust gas passes through the internal gas path to the dust separator 14, and the exhaust gas is delivered to the dust separator 14 through the first gas path 15.
Preferably, the starting point of the second air path 16 is a heat exchanger 12, the temperature of the inlet of the inner air path is 130 ℃, the temperature of the fresh air is heated by the outer air path, the temperature of the air is increased to 100 ℃, and the temperature of the tail gas is decreased to 100 ℃; the air is heated by the heater 13 and then is conveyed to the air inlet 6; the heater 13 heats the air preheated by the heat exchanger 12 to 200 c to prepare a high temperature heat carrier gas.
The second gas path 16 fully utilizes the waste heat of the tail gas to preheat the high-temperature hot carrier gas, so that the energy is saved, and the overall thermal efficiency of the drying device is improved; the tail gas contains water vapor, the temperature of the tail gas is not less than 100 ℃, the water still keeps in a gaseous state and is conveyed to the dust remover 14 along with the tail gas, the water vapor is prevented from being condensed, and the smoothness of an internal gas channel is ensured.
Preferably, the third gas path 17 starts at the dust separator 14 and ends at the feed port 1.
Preferably, the tail gas enters the dust remover 14 for purification, entrained particles are discharged, and the tail gas after dust removal and purification is conveyed to the feed port 1 through the third gas path 17.
Preferably, the dust separator 14 is a cyclone.
Preferably, the first air path 15, the second air path 16 and the third air path 17 are all coated with insulating layers to maintain the air temperature and reduce the heat loss.
Compared with the prior art, the drying device provided by the embodiment has the advantages that the low-temperature pre-drying area and the high-temperature intensified drying area optimize the drying energy configuration; the strength of the lignite particles is guaranteed, the particle crushing condition can be effectively relieved, the content of fine particle dust of the product is low, and the spontaneous combustion phenomenon of lignite dry powder can be prevented; the discharged high-temperature tail gas is preheated for the high-temperature enhanced drying hot carrier gas through the heat exchanger 12, purified through the dust remover 14 and returned to the low-temperature pre-drying stage to be used as the low-temperature hot carrier gas for heating materials, so that the overall heat efficiency is improved; the material slowly advances from the low-temperature pre-drying area, enters the high-temperature enhanced drying area through the roller connector 4, and is discharged from the discharge hole 10, so that the continuous operation of the drying device is realized; the microwave generating mechanism can cause the wall-sticking material to generate cracks and burst, so that the wall-sticking material can quickly fall off from the wall of the roller, the wall-sticking material can be removed without stopping, the efficiency of the drying device is improved, and the smooth conveying of the moisture-containing lignite in the drying process is ensured; the air outlet 7 is aligned with the second microwave generator 9, the hot air sprayed from the air outlet 7 directly blows the second microwave generator 9 to take away the lignite particles attached to the second microwave generator 9, and the second microwave generator 9 is ensured to work efficiently.
Example 2
In another embodiment of the invention, referring to fig. 3, a method for continuously drying lignite is disclosed, which comprises the following steps:
step 1: feeding, and feeding low-temperature hot carrier gas;
specifically, the particle size of the lignite is less than 25 mm, and the mass ratio of the water content is 60% at most. Lignite particles are conveyed from the coal bunker to the feed inlet 1 through a conveying belt, meanwhile, the tail gas circulating mechanism conveys low-temperature hot carrier gas at 90 ℃ to the feed inlet 1, and the lignite particles and the low-temperature hot carrier gas are conveyed to enter the rolling mechanism through the feed inlet 1;
step 2: pre-drying lignite at low temperature;
the rolling mechanism comprises a first roller 2, a second roller 3 and a roller connector 4;
the step 2 comprises the following sub-steps:
step 21: rolling at low temperature and predrying;
a plurality of lifting blades 5 are arranged in the first roller 2, the height of each lifting blade 5 is 0.3 m, when the first roller 2 rolls, lignite particles roll under the action of the lifting blades 5, the lignite particles are guaranteed to be fully contacted with low-temperature hot carrier gas, the initial temperature of the low-temperature pre-drying stage is 80 ℃, and the rotating speed of the first roller 2 is 8 revolutions per minute;
in the stage, the temperature of the lignite particles is rapidly increased from room temperature to 80 ℃, free water in cracks and macropore structures in the lignite particles is rapidly removed, and the residence time of the lignite particles in a low-temperature pre-drying area is 10 minutes;
step 22: pre-drying at low temperature to break viscosity;
when the thickness of the adhered wet lignite exceeds 0.15 m, the rolling effect of the material lifting plate 5 on lignite particles is weakened, at the moment, the microwave generating mechanism is opened, the internal temperature of the lignite adhered to the wall of the roller exceeds 100 ℃ instantly, the internal moisture is quickly vaporized to generate high-pressure steam, the lignite particles are cracked instantly and separated from the wall of the roller, and thus the effect of breaking the viscosity of the lignite is achieved;
and step 3: conveying and reheating the lignite in the middle;
lignite particles and low-temperature hot carrier gas pass through the hollow part and are conveyed to the second roller 3 from the first roller 2, and the gas outlet 7 conveys the high-temperature hot carrier gas with the temperature of 200 ℃ to the rolling mechanism to heat the lignite particles;
and 4, step 4: the high-temperature reinforced drying of the lignite comprises the following steps;
step 41: rolling at high temperature for strengthening drying;
the initial temperature is 180 ℃ -190 ℃, the rotating speed of the second roller 3 is 3 rpm, a plurality of lifting blades 5 are arranged in the second roller 3, the height of each lifting blade 5 is 0.3 m, and when the second roller 3 rolls, the lignite particles roll under the action of the lifting blades 5, so that the lignite particles are ensured to be fully contacted with high-temperature hot carrier gas.
Step 42: drying and breaking the viscosity at high temperature;
when the thickness of the adhered wet lignite exceeds 0.15 m, the rolling effect of the material lifting plate 5 on lignite particles is weakened, at the moment, the microwave generating mechanism is opened, the internal temperature of the lignite adhered to the wall of the roller exceeds 100 ℃ instantly, the internal moisture is quickly vaporized to generate high-pressure steam, the lignite particles are cracked instantly and separated from the wall of the roller, and thus the effect of breaking the viscosity of the lignite is achieved;
and 5: recycling the tail gas, comprising the following steps;
the tail gas circulating mechanism comprises a heat exchanger 12, a heater 13, a dust remover 14, a first gas circuit 15, a second gas circuit 16 and a third gas circuit 17.
Step 51: tail gas dust removal;
the tail gas is conveyed to a dust remover 14 through a first gas path 15, enters the dust remover 14 for purification, and discharges entrained lignite particles;
step 52: preparing high-temperature heat carrier gas;
the temperature of the inlet of the inner air duct is 130 ℃, the temperature of the air is room temperature when the air enters the outer air duct, the temperature of the air is increased to 100 ℃ after the air is heated by the outer air duct, and the temperature of the tail gas is reduced to 100 ℃; the air is heated by the heater 13 and then is conveyed to the air inlet 6; the heater 13 heats the air preheated by the heat exchanger 12 to 200 ℃ to prepare high-temperature hot carrier gas;
step 53; preparation of low-temperature heat carrier gas
The starting point of the third gas path 17 is a dust remover 14, the end point is a feed inlet 1, the tail gas after dust removal and purification is 100 ℃, the tail gas is conveyed to the feed inlet 1 through the third gas path 17, the temperature is reduced to 90 ℃, and the tail gas is prepared into low-temperature heat carrier gas;
step 6: discharging;
the dried lignite granules are discharged from a discharge hole 10, and the moisture content of the lignite is less than 15% by mass.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The continuous lignite drying device is characterized by comprising a feeding mechanism, a rolling mechanism, a microwave generating mechanism, a discharging mechanism and a tail gas circulating mechanism, wherein the feeding mechanism is respectively connected with the rolling mechanism and the tail gas circulating mechanism, the microwave generating mechanism is arranged in the rolling mechanism, and the rolling mechanism is connected with the tail gas circulating mechanism through the discharging mechanism.
2. The lignite continuous drying device according to claim 1, characterized in that the feeding mechanism comprises a feeding port (1).
3. The lignite continuous drying device according to claim 1, characterized in that the rolling mechanism comprises a first roller (2), a second roller (3) and a roller connector (4).
4. The lignite continuous drying device according to claim 1, wherein the rolling mechanism is arranged obliquely, and the included angle between the rolling mechanism and the ground is 5 degrees.
5. The lignite continuous drying device according to claim 3, characterized in that a plurality of lifting blades (5) are arranged in the first drum (2) and the second drum (3).
6. The continuous lignite drying device according to claim 5, characterized in that the lifting blades (5) are arranged on the inner walls of the first drum (2) and the second drum (3).
7. The continuous lignite drying device according to claim 5, characterized in that the height of the lifting blades (5) is 0.3 m.
8. A continuous lignite drying apparatus according to claim 3, characterized in that the first drum (2) is a low temperature pre-drying zone with an initial temperature of 80 ℃.
9. A continuous lignite drying apparatus according to claim 3, characterized in that the second drum (3) is internally provided with a high temperature intensive drying zone with an initial temperature of 180-190 ℃.
10. The drying method of the lignite continuous drying device according to any one of claims 1 to 9, characterized by comprising the steps of:
step 1: feeding and feeding low-temperature heat carrier gas;
step 2: pre-drying lignite at low temperature;
and 3, step 3: conveying and reheating the lignite in the middle;
and 4, step 4: high-temperature intensified drying of lignite;
and 5: recycling the tail gas;
step 6: discharging.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507621A (en) * | 2022-10-08 | 2022-12-23 | 中国矿业大学 | Continuous drying method for lignite |
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