CN110411151A - A kind of device and method of microwave hot air combined drying brown coal - Google Patents

A kind of device and method of microwave hot air combined drying brown coal Download PDF

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Publication number
CN110411151A
CN110411151A CN201910626973.9A CN201910626973A CN110411151A CN 110411151 A CN110411151 A CN 110411151A CN 201910626973 A CN201910626973 A CN 201910626973A CN 110411151 A CN110411151 A CN 110411151A
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China
Prior art keywords
microwave
hot air
drying
brown coal
coal
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CN201910626973.9A
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Chinese (zh)
Inventor
刘晨辉
和志秀
高冀芸
王访
贾丽娟
赵鹏飞
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Yunnan Minzu University
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Yunnan Minzu University
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Priority to CN201910626973.9A priority Critical patent/CN110411151A/en
Publication of CN110411151A publication Critical patent/CN110411151A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F26B1/005Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12Machines 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
    • F26B17/14Machines 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 the materials moving through a counter-current of gas
    • F26B17/1433Machines 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 the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material
    • F26B17/1466Machines 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 the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material the members or bodies being in movement
    • F26B17/1475Machines 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 the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material the members or bodies being in movement the movement being a vibration or oscillation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001Handling, e.g. loading or unloading arrangements
    • F26B25/002Handling, e.g. loading or unloading arrangements for bulk goods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/04Agitating, stirring, or scraping devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/02Drying 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
    • F26B3/04Drying 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 circulating over or surrounding the materials or objects to be dried
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/32Drying 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
    • F26B3/34Drying 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
    • F26B3/347Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse 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 discloses a kind of device and method of microwave hot air combined drying brown coal, belong to brown coal drying equipment technical field, described device includes feeding device, vibration transmission mechanism, hot air generator, microwave generating apparatus, dry cavity, temp measuring system and exhaust gas processing device.Feeding device includes feed hopper and screw-feeder, hot air generator includes air blower and hot-blast stove, the top of dry cavity is equipped with 1 or more microwave generating apparatus and 1 or more exhaust outlet, the metal shell of insulating layer and maskable microwave is equipped in cavity, the vibration transmission mechanism is connected with the vibrating motor of containment portion, and end is equipped with the baffle and discharge port that can be twitched.The method of the microwave hot air combined drying brown coal is the following steps are included: raw coal is crushed, screened processing;Pass through screw-feeder sample introduction again;Open hot air generator and microwave generating apparatus;It is vibrated and is transmitted by vibration transmission mechanism, the microwave hot air combined lignite to microwave drying cavity is dried;The finished product being dried to obtain is collected into finished product coal bunker by flapper.Apparatus of the present invention structure is simple, and cost of investment is low, and occupied area is small, and operating efficiency height is, it can be achieved that continuous production;The thermal efficiency of material can be improved in the method for microwave combined heated-air drying, and rate of drying is fast;Waste heat recycling, capacity usage ratio is high, reduces energy consumption, environmentally friendly.

Description

A kind of device and method of microwave hot air combined drying brown coal
Technical field
The invention belongs to brown coal drying field, in particular to a kind of device and method of microwave hot air combined drying brown coal.
Background technique
Lignite belongs to low-quality coal, and since hole and surface are flourishing, therefore water imbibition is strong, itself moisture height (20~50%).Combustion Burning smog is big, calorific value is low, the self-defects such as easy-weathering and spontaneous combustion, is not easy to store and transport, greatly limits it Effective trans-utilization seriously restricts its economic benefit and competitiveness.In order to clean, lignite resource is efficiently utilized, reduces and utilizes Cost, the dehydration upgrading modification before burning to lignite is essential step.
Currently, conventional brown coal drying method is mainly fluidized bed or spin drying method both at home and abroad, it is generally existing following Disadvantage: 1. can only remove lignite free moisture, be not easy dry inherent water and capillary water, and dry finished product easily occurs moisture and relapses;② Easily there is fine coal accident of igniting, there is the burning even danger of explosion;3. drying equipment structure is complicated, energy consumption is big, occupied area Greatly, and high equipment cost;4. the water content of lignite end and block is uneven, uneven drying.Microwave drying rate is fast, selectivity Good, penetrability is strong, can stop using, and is a kind of environmentally friendly brown coal drying mode.
Patent No. CN102564095 is disclosed " a kind of device and method of low-pressure superheated steam drying brown coal ", is used Steam moves from bottom to top, and the mode that lignite moves from top to bottom is dried, and complex process, process conditions are stringent, exists The shortcomings that day output is low, uneven drying.Patent No. CN102207350B discloses " a kind of microwave fluidized drying lignite Method ", the method is to first pass through raw material lignite to be connected with the microwave device of hot wind and carry out predrying, using being connected with hot wind Fluidized bed plant carries out fluidized drying, realizes the drying process to lignite.But the patented method process is complicated, equipment takes up an area face Product is big, and the process implantation of hot wind, energy consumption height and industrial cost are high twice.
In order to achieve the purpose that expected energy conservation and environmental protection, consumption reduction and effectively upgrading.Therefore, a kind of process letter is developed Single, safety, low energy consumption, dehydration rate is high and does not relapse the brown coal drying technology of water, and the industrial applications for lignite are great realities Border meaning.
Summary of the invention
The purpose of the present invention is to provide a kind of device and method of microwave hot air combined drying brown coal, using microwave hot air Combined drying technology reduces problem of environmental pollution in operation process, improves the rate of drying and moisture of lignite in conjunction with vibrating screen Removal rate, can continuous processing lignite, increase day output, realize scale application.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of device of microwave hot air combined drying brown coal characterized by comprising feeding device, vibration transmission mechanism (13), Hot air generator, microwave generating apparatus (7), dry cavity (11), temp measuring system and exhaust gas processing device (10), the charging Device includes feed hopper (4) and screw-feeder (5), and the hot air generator includes air blower (1) and hot-blast stove (2), institute The top for stating dry cavity (11) is equipped with 1 or more microwave generating apparatus (7) and 1 or more exhaust outlet (6), is equipped with and protects in cavity The metal shell of warm layer and maskable microwave, the vibration transmission mechanism (13) are connected with the vibrating motor (12) of containment portion It connects, end is equipped with the baffle (18) and discharge port (19) that can be twitched, and the lignite after finally drying is collected into finished product coal bunker (20).
The microwave generating apparatus (7) further comprise AC power source (21), magnetron (22), microwave plumbing (23) and Antenna (24), the microwave generating apparatus (7) are adjusted frequency and power, and power is 1 ~ 20kW, frequency be 915 ± 50MHz or 2450±50MHz。
The vibration transmission mechanism (13) further comprises driving motor (25), active live-roller (26), vibrating screen surface (27), conveyer belt (28), bottom plate (29), bracket (30) and slave drive roller (31), the vibration transmission mechanism (13) have one Fixed inclination angle, lower end are equipped with damping spring (15) and support base (16), and the vibrating screen surface (27) is wear-resisting compass screen surface.
The temp measuring system further comprises infrared temperature probe (8) and number display temperature measurer (9).
Hot wind flow direction in the dry cavity (11) and the conveying direction of raw material lignite are reciprocal.
The hot blast temperature that the hot air generator provides is 80~220 DEG C, 20% or less oxygen content.
Air filter is equipped in the exhaust gas processing device (10), after routine techniques gas solid separation and dehydration Tail gas, by gas-separating valve (3) circulation heat recovery wind generation apparatus, solid is recovered in finished product coal bunker (20) by waste heat recycling.
In addition, method of the present invention as microwave hot air combined drying brown coal, it may include step:
1) raw coal is crushed, screened processing obtains coal sample;
2) screw-feeder is added by feed hopper in the coal sample for obtaining step 1), continuously to microwave under the stirring of helical blade It is supplied in dry cavity;
3) hot air generator and microwave generating apparatus are opened, provides hot wind and microwave to microwave drying cavity, and described in adjusting The power and frequency of the temperature of hot air generator and the microwave generating apparatus;
4) temperature measuring equipment is opened, real time temperature measurement is carried out to microwave drying cavity;
5) vibrate and transmit by vibration transmission mechanism, it is microwave hot air combined to be supplied to the lignite of the microwave drying cavity into Row drying;
6) finished product for being dried to obtain step 5) is collected into finished product coal bunker by flapper;
7) steam is supplied from the more than one exhaust outlet on microwave drying cavity top to exhaust gas processing device, and treated steams Vapour is recovered to hot air generator, and obtained solid is recovered in finished product coal bunker.
The method of the microwave hot air combined drying brown coal, which is characterized in that place is crushed and screened in the step 1) Coal sample size≤3mm of reason.
The method of the microwave hot air combined drying brown coal, which is characterized in that hot air generator in the step 3) Temperature be 80 ~ 220 DEG C, 20% or less oxygen content.
The method of the microwave hot air combined drying brown coal, which is characterized in that microwave generating apparatus in the step 3) Power be 1 ~ 20kW, frequency be 915 ± 50MHz or 2450 ± 50MHz, drying time be 2 ~ 20min.
The method of the microwave hot air combined drying brown coal, which is characterized in that temperature measuring equipment range in the step 4) It is -30 ~ 650 DEG C.
The method of the microwave hot air combined drying brown coal, which is characterized in that hot wind flow direction in the step 5) It is reciprocal with the conveying direction of raw material lignite, and become upward movement after hot wind horizontal movement to inclined vibration transmission mechanism and become Gesture is conducive to steam and is discharged.
The method of the microwave hot air combined drying brown coal, which is characterized in that entire drying process is continous way.
Beneficial effects of the present invention:
1, the present invention provides a kind of device of microwave hot air combined drying brown coal, and apparatus structure is simple, and cost of investment is low, takes up an area face Product is small, and operating efficiency height is, it can be achieved that continuous production.
2, in apparatus of the present invention, selective heating is carried out to the moisture in lignite using microwave energy, solves traditional drying Technology is unable to the problem of depth drying, is conducive to the integrality for keeping lignite matrix, the side of mass-and heat-transfer in microwave drying process To consistent, by lignite content to surface, in conjunction with heated-air drying, rate of drying is greatly speeded up.
3, apparatus of the present invention use the vibration transmission mechanism device with certain inclination angle, solve material in transmit process In easy putty the problem of so that material increases gas-solid contact area, and the movement of hot wind and material in entire drying process Direction is reciprocal, sufficiently exchanges heat, and drying effect more evenly, becomes upward after hot wind horizontal movement to inclined vibration transmission mechanism Movement tendency is conducive to steam and is discharged.
4, hot wind carries vapor and flows in the cavity, avoids microwave drying lignite and easily occurs striking sparks and burning in the process Security risk.
5, when microwave hot air combined dry, the micro coal tar being precipitated in lignite condenses blocking pore on its surface, To reduce the hydrophily of lignite, achieve the effect that brown coal drying and upgrading.
6, drying temperature is low, and the utilization rate of energy is high, reduces energy consumption, highly-safe, environmental pollution is small.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram of the microwave hot air combined drying brown coal of the present invention;
Fig. 2 is microwave generator schematic diagram;
Fig. 3 is vibration transmission mechanism schematic diagram;
Wherein: 1 is air blower, and 2 be hot-blast stove, and 3 be gas-separating valve, and 4 be feed hopper, and 5 be screw-feeder, and 6 be exhaust outlet, and 7 are Microwave generating apparatus, 8 be infrared temperature probe, and 9 be number display temperature measurer, and 10 be exhaust gas processing device, and 11 be dry cavity, 12 be vibrating motor, and 13 be vibration transmission mechanism, and 14 be insulating layer, and 15 be damping spring, and 16 be support base, and 17 is outside metals Shell, 18 be baffle, and 19 be discharge port, and 20 be finished product coal bunker, and 21 be AC power source, and 22 be magnetron, and 23 be microwave plumbing, 24 For antenna, 25 it is driving motor, 26 is active live-roller, 27 be vibrating screen surface, and 28 be conveyer belt, and 29 be bottom plate, and 30 be bracket, 31 be slave drive roller.
Specific embodiment
In order to which the technological means for realizing the present invention is easy to understand, in the following, referring to attached drawing, in conjunction with specific example to this The technical solution of invention is further described, but the present invention is not limited to following embodiments.
Embodiment 1
As shown in Figure 1, a kind of device of microwave hot air combined drying brown coal, comprising: feeding device, vibration transmission mechanism (13), Hot air generator, microwave generating apparatus (7), dry cavity (11), temp measuring system and exhaust gas processing device (10), the charging Device includes feed hopper (4) and screw-feeder (5), and the hot air generator includes air blower (1) and hot-blast stove (2), institute The top for stating dry cavity (11) is equipped with 1 or more microwave generating apparatus (7) and 1 or more exhaust outlet (6), is equipped with and protects in cavity The metal shell of warm layer and maskable microwave, the vibration transmission mechanism (13) are connected with the vibrating motor (12) of containment portion It connecing, end is equipped with the baffle (18) and discharge port (19) that can be twitched, and the lignite after finally drying is collected into finished product coal bunker (20), Dotted arrow indicates the direction of motion of gas, and solid arrow indicates the direction of motion of material.
As shown in Fig. 2, the microwave generating apparatus (7) further comprises AC power source (21), magnetron (22), microwave wave Frequency and power is adjusted in conduit (23) and antenna (24), the microwave generating apparatus (7).
As shown in figure 3, the vibration transmission mechanism (13) further comprise driving motor (25), active live-roller (26), Vibrating screen surface (27), conveyer belt (28), bottom plate (29), bracket (30) and slave drive roller (31), the vibration transmission mechanism (13) there is certain inclination angle, lower end is equipped with damping spring (15) and support base (16), and the vibrating screen surface (27) is resistance to Grind compass screen surface.
The temp measuring system further comprises infrared temperature probe (8) and number display temperature measurer (9).
Hot wind flow direction in the dry cavity (11) and the conveying direction of raw material lignite are reciprocal.
The hot blast temperature that the hot air generator provides is 80~220 DEG C, 20% or less oxygen content.
Air filter is equipped in the exhaust gas processing device (10), after routine techniques gas solid separation and dehydration Solid is recovered in finished product coal bunker (20) by tail gas by gas-separating valve (3) circulation heat recovery wind generation apparatus.
A kind of method of microwave hot air combined drying brown coal, the lignite coal sample used are including following for Zhaotong County, Yunnan lignite Step:
1) raw coal is crushed, it is≤1mm that screened processing, which obtains coal sample size,;
2) screw-feeder is added by feed hopper in the coal sample for obtaining step 1), continuously to microwave under the stirring of helical blade It is supplied in dry cavity;
3) hot air generator and microwave generating apparatus are opened, provides hot wind and microwave to microwave drying cavity, and described in adjusting The temperature of hot air generator is 100 DEG C and the power of the microwave generating apparatus is 2000W and frequency is 2450MHz;
4) temperature measuring equipment is opened, real time temperature measurement is carried out to microwave drying cavity;
5) it vibrates and transmits by vibration transmission mechanism, it is microwave hot air combined dry to the lignite for being supplied to the microwave drying cavity Dry 6min;
6) finished product for being dried to obtain step 5) is collected into finished product coal bunker by flapper;
7) steam is supplied from the more than one exhaust outlet on microwave drying cavity top to exhaust gas processing device, and treated steams Vapour is recovered to hot air generator, and obtained solid is recovered in finished product coal bunker.
By the device and method of this microwave hot air combined drying brown coal, lignite dehydration rate is up to 80% or more.
Embodiment 2
The apparatus structure of microwave hot air combined drying brown coal is the same as embodiment 1.
A kind of method of microwave hot air combined drying brown coal, the lignite coal sample used are including following for Zhaotong County, Yunnan lignite Step:
1) raw coal is crushed, it is≤2mm that screened processing, which obtains coal sample size,;
2) screw-feeder is added by feed hopper in the coal sample for obtaining step 1), continuously to microwave under the stirring of helical blade It is supplied in dry cavity;
3) hot air generator and microwave generating apparatus are opened, provides hot wind and microwave to microwave drying cavity, and described in adjusting The temperature of hot air apparatus is 120 DEG C and the power of the microwave generating apparatus is 1000W and frequency is 915MHz;
4) temperature measuring equipment is opened, real time temperature measurement is carried out to microwave drying cavity;
5) it vibrates and transmits by vibration transmission mechanism, it is microwave hot air combined dry to the lignite for being supplied to the microwave drying cavity Dry 8min;
6) finished product for being dried to obtain step 5) is collected into finished product coal bunker by flapper;
7) steam is supplied from the more than one exhaust outlet on microwave drying cavity top to exhaust gas processing device, and treated steams Vapour is recovered to hot air generator, and obtained solid is recovered in finished product coal bunker.
By the device and method of this microwave hot air combined drying brown coal, lignite dehydration rate is up to 85% or more.
Embodiment 3
The apparatus structure of microwave hot air combined drying brown coal is the same as embodiment 1.
A kind of method of microwave hot air combined drying brown coal, the lignite coal sample used are including following for Zhaotong County, Yunnan lignite Step:
1) raw coal is crushed, it is≤3mm that screened processing, which obtains coal sample size,;
2) screw-feeder is added by feed hopper in the coal sample for obtaining step 1), continuously to microwave under the stirring of helical blade It is supplied in dry cavity;
3) hot air generator and microwave generating apparatus are opened, provides hot wind and microwave to microwave drying cavity, and described in adjusting The temperature of hot air generator is 150 DEG C and the power of the microwave generating apparatus is 4000W and frequency is 915MHz;
4) temperature measuring equipment is opened, real time temperature measurement is carried out to microwave drying cavity;
5) it vibrates and transmits by vibration transmission mechanism, it is microwave hot air combined dry to the lignite for being supplied to the microwave drying cavity Dry 4min;
6) finished product for being dried to obtain step 5) is collected into finished product coal bunker by flapper;
7) steam is supplied from the more than one exhaust outlet on microwave drying cavity top to exhaust gas processing device, and treated steams Vapour is recovered to hot air generator, and obtained solid is recovered in finished product coal bunker.
By the device and method of this microwave hot air combined drying brown coal, lignite dehydration rate is up to 90% or more.

Claims (14)

1. a kind of device of microwave hot air combined drying brown coal characterized by comprising feeding device, vibration transmission mechanism (13), hot air generator, microwave generating apparatus (7), dry cavity (11), temp measuring system and exhaust gas processing device (10), institute Stating feeding device includes feed hopper (4) and screw-feeder (5), and the hot air generator includes air blower (1) and hot-blast stove (2), the top of the dry cavity (11) is equipped with 1 or more microwave generating apparatus (7) and 1 or more exhaust outlet (6), in cavity Metal shell equipped with insulating layer and maskable microwave, the vibrating motor (12) of the vibration transmission mechanism (13) and containment portion It is connected, end is equipped with the baffle (18) and discharge port (19) that can be twitched, and the lignite after finally drying is collected into finished product coal bunker (20)。
2. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the microwave fills Setting (7) further comprises AC power source (21), magnetron (22), microwave plumbing (23) and antenna (24), and the microwave occurs Frequency and power is adjusted in device (7), and power is 1 ~ 20kW, and frequency is 915 ± 50MHz or 2450 ± 50MHz.
3. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the vibration driver Structure (13) further comprise driving motor (25), active live-roller (26), vibrating screen surface (27), conveyer belt (28), bottom plate (29), Bracket (30) and slave drive roller (31), the vibration transmission mechanism (13) have certain inclination angle, and lower end is equipped with damping Spring (15) and support base (16), the vibrating screen surface (27) are wear-resisting compass screen surface.
4. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the temp measuring system into One step includes infrared temperature probe (8) and number display temperature measurer (9).
5. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the dry cavity (11) hot wind flow direction in and the conveying direction of raw material lignite are reciprocal.
6. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the hot wind fills The hot blast temperature for setting offer is 80~220 DEG C, 20% or less oxygen content.
7. the device of microwave hot air combined drying brown coal according to claim 1, which is characterized in that the vent gas treatment dress It sets and is equipped with air filter in (10), the tail gas after routine techniques gas solid separation and dehydration is recycled by gas-separating valve (3) Solid is recovered in finished product coal bunker (20) by backheat wind generation apparatus.
8. a kind of method of microwave hot air combined drying brown coal, which comprises the following steps:
1) raw coal is crushed, screened processing obtains coal sample;
2) screw-feeder is added by feed hopper in the coal sample for obtaining step 1), continuously to microwave under the stirring of helical blade It is supplied in dry cavity;
3) hot air generator and microwave generating apparatus are opened, provides hot wind and microwave to microwave drying cavity, and described in adjusting The power and frequency of the temperature of hot air generator and the microwave generating apparatus;
4) temperature measuring equipment is opened, real time temperature measurement is carried out to microwave drying cavity;
5) vibrate and transmit by vibration transmission mechanism, it is microwave hot air combined to be supplied to the lignite of the microwave drying cavity into Row drying;
6) finished product for being dried to obtain step 5) is collected into finished product coal bunker by flapper;
7) steam is supplied from the more than one exhaust outlet on microwave drying cavity top to exhaust gas processing device, treated steam It is recovered to hot air generator, obtained solid is recovered in finished product coal bunker.
9. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that warp in the step 1) Crush and screen coal sample size≤3mm of processing.
10. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that in the step 3) The temperature of hot air generator is 80 ~ 220 DEG C, 20% or less oxygen content.
11. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that in the step 3) The power of microwave generating apparatus is 1 ~ 20kW, and frequency is 915 ± 50MHz or 2450 ± 50MHz, and drying time is 2 ~ 20min.
12. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that in the step 4) Temperature measuring equipment range is -30 ~ 650 DEG C.
13. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that in the step 5) Hot wind flow direction and the conveying direction of raw material lignite are reciprocal, and become after hot wind horizontal movement to inclined vibration transmission mechanism Upward movement tendency is conducive to steam and is discharged.
14. the method for microwave hot air combined drying brown coal according to claim 8, which is characterized in that entire drying process For continous way.
CN201910626973.9A 2019-07-12 2019-07-12 A kind of device and method of microwave hot air combined drying brown coal Pending CN110411151A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111059866A (en) * 2019-12-25 2020-04-24 河海大学 Method for promoting microwave dehydration process of lignite by selecting cationic additive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111059866A (en) * 2019-12-25 2020-04-24 河海大学 Method for promoting microwave dehydration process of lignite by selecting cationic additive

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