CN102650494B - Device and technology for drying lignite by jointly using superheated steam and high frequency - Google Patents
Device and technology for drying lignite by jointly using superheated steam and high frequency Download PDFInfo
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- CN102650494B CN102650494B CN201210158454.2A CN201210158454A CN102650494B CN 102650494 B CN102650494 B CN 102650494B CN 201210158454 A CN201210158454 A CN 201210158454A CN 102650494 B CN102650494 B CN 102650494B
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Abstract
The invention discloses a device and a technology for drying lignite by jointly using superheated steam and high frequency. The device comprises at least an internal heating fluidized bed dryer with a built-in heat exchanger, a high frequency drier and an external heat exchanger, wherein the internal heating fluidized bed dryer is provided with a material feeding device and a dedusting device; the built-in heat exchanger of the internal heating fluidized bed dryer is connected with saturated steam; a fluidized bed of the internal heating fluidized bed dryer is connected with superheated steam; the built-in heat exchanger is further connected with a condensate water system; after exhaust gas of the internal heating fluidized bed dryer is primarily dedusted by the dedusting device, pressurized by a pressurizing device and secondarily dedusted by the dedusting device, one part of the exhaust gas returns to the fluidized bed and the other part of the exhaust gas is evacuated after exchanging heat with pressurized air via the external heat exchanger; and the heated air enters the high frequency drier via a ventilation system. The device has the advantages of low energy consumption, good drying effect, environmental friendliness, water conservation, and the like.
Description
Technical field
The present invention relates to a kind of brown coal drying device and technique, relate in particular to device and the technique of a kind of superheated steam and high frequency combined drying brown coal.
Background technology
The dry technology of brown coal is a lot, mainly contains the direct contact drying of hot flue gas, saturated vapor contact drying, oil drying, hot water drying and superheat steam drying etc.The direct contact drying of hot flue gas adopts high-temperature flue gas directly to contact with brown coal the moisture removing in brown coal, it has, and technique is simple, easy to operate, treating capacity large, be easy to the advantages such as industrialization, be comparatively ripe at present a kind of brown coal drying technology, but have the shortcomings such as easy spontaneous combustion blast, UTILIZATION OF VESIDUAL HEAT IN difficulty.It is drying medium that saturated vapor contact drying adopts low-pressure saturated steam, removes moisture by tube wall heat transfer indirect brown coal, its have safe, can continued operation the advantage such as operation, but also have that disposal ability is little, power consumption and the deficiency such as water consumption is large.Oil drying is taking oils as drying medium, and coal and oil are mixed to pulping, generally thermal dehydration under normal pressure.Hot water drying mode is that coal-water mixture is packed in high-pressure bottle, and airtight this high-pressure bottle of rear heating, makes the moisture of the brown coal in HTHP hot water discharge with liquid form.Oil drying and hot water drying technology are still in experimental stage at present, and technique is still immature.Superheat steam drying refers to a kind of drying mode that utilizes superheated steam directly contact with material and to remove moisture, and it has that energy-saving effect is given prominence to, drying quality is good, nothing is caught fire and explosion danger, heat and mass efficiency high, is applicable to carrying out being dried of brown coal.
Patent (200910015753.9) discloses a kind of superheated steam brown coal pre-drying device and technique thereof, and the drying process of just internal heating fluidized bed and superheat steam drying grafting, is suitable for the dry processing of brown coal, has the advantages such as advanced person, efficient, safety.But there is constant rate drying period and falling rate drying period in brown coal superheat steam drying.At constant rate drying period, the moisture of brown coal drying is mainly free moisture, and rate of drying is very fast, and capacity usage ratio is high.And at falling rate drying period, the moisture of brown coal drying is mainly inherent moisture, the Changing Pattern of rate of drying is relevant with material properties and internal structure, total show as speed that moisture shifts to surface from material inside lower than material table the boil-off rate towards dry gas, evaporation is controlled and is transformed into diffusion inside control by surface vaporization, decline rapidly in this stage rate of drying, capacity usage ratio reduces.Therefore, this device and technique thereof are falling rate drying period in the later stage of brown coal drying, can have that rate of drying is little, drying time the long and deficiency such as large that consumes energy, need to improve this technique.
The present invention will utilize dielectric drying technology to have advantages of that applicable material internal moisture is dry, adopts this technology to substitute the inherent moisture of Superheated Steam Drying Technology for drying brown coal, further optimizes the drying effect of brown coal, improves capacity usage ratio.
Summary of the invention
The present invention proposes to adopt the internal heating fluidized bed dry technology of superheated steam and dielectric drying technical tie-up to be dried, adopt the free moisture of the internal heating fluidized bed technology drying brown coal of superheated steam, adopt the inherent moisture of dielectric drying technology drying brown coal, reasonable energy utilization, has improved brown coal drying effect.For achieving the above object, the present invention adopts following technical proposals:
A device for superheated steam and high frequency combined drying brown coal, comprises internal heating fluidized bed drying machine, dielectric dryer and the external heat exchanger of at least one built-in heat exchanger; Internal heating fluidized bed drying machine is provided with feeding device and dust arrester; The built-in heat exchanger of internal heating fluidized bed drying machine is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine is connected with superheated steam, and built-in heat exchanger is also connected with condensate system; The weary gas of internal heating fluidized bed drying machine returns to fluid bed through dust arrester dedusting and through pressue device pressurization, dust arrester dedusting rear portion, emptying after the air heat-exchange of another part after external heat exchanger and pressurization, heated air enters dielectric dryer through ventilating system.
Described dust arrester is made up of cyclone dust collectors and electric cleaner; Wherein weary gas is after cyclone dust collectors dedusting, and the dry powder of collection is sent into finished product district, and weary gas enters electric cleaner dedusting after pressue device pressurization, and dedusting Hou Yi returns to fluid bed in road, emptying after the air heat-exchange of another road after external heat exchanger and pressurization.
The discharging opening of charging aperture, discharging opening and the cyclone dust collectors of described internal heating fluidized bed drying machine is all connected with discharge valve.
Described feeding device comprises feed bin, and feed bin coordinates with screw conveyer, and screw conveyer is connected with discharge valve I, and discharge valve I is connected with internal heating fluidized bed drying machine.
Described pressue device is blower fan.
Described dielectric dryer tranmitting frequency is the electric wave of 6.78MHz or 13.56MHz or 27.12MHz or 40.68MHz, make dielectric molecule polarization repeatedly under the electric field action changing in material, the continuous frictional vibration of molecule between positive and negative two electrodes, produce heat energy, make the moisture vaporization in material.
The principle of dielectric drying is: tranmitting frequency is 6.78MHz(or 13.56MHz, 27.12MHz, 40.68MHz) high-frequency electric wave, the polar molecule of the material in electric field will rearrange, one end of positively charged is towards negative pole, and electronegative one end is towards positive pole.If change direction of an electric field, the orientation of polar molecule also changes thereupon.If electric field alternately changes rapidly direction, polar molecule is also along with rapid swing.Due to the interaction between warm-up movement and the adjacent molecule of molecule, polar molecule changes with direction of an electric field the rule of doing and swings and will be interfered and hinder, and has produced the effect of similar friction, makes molecule obtain energy, produces heat energy, the moisture vaporization in material.As can be seen here, thereby dielectric drying is mainly to make the hydrone effect of material inside and vaporize and reach the object of dry materials, thereby this dry technology is very suitable for the dry of brown coal inherent moisture.
Therefore, adopt internal heating fluidized bed superheated steam dry and drying process that dielectric drying is combined, free moisture and inherent moisture to brown coal are dried respectively, rationally, effectively utilized the energy.
A technique for superheated steam and high frequency combined drying brown coal, it directly contacts and takes away part steam with brown coal taking superheated steam as fluidizing agent, again through electromagnetic field of high frequency, further removes moisture from fluid bed brown coal out; Its detailed process is:
1) wet brown coal are sent into the charging aperture of internal heating fluidized bed drying machine by screw conveyer, discharge valve from feed bin, entered in fluid bed.
2) superheated steam enters fluid bed by internal heating fluidized bed bottom air compartment, after the equal wind of air-distribution device, enters bed.
3) saturated vapor is sent into its built-in heat exchanger as drying source.
4) by controlling the time of staying of brown coal in bed, be dried after its inherent moisture, brown coal are discharged and sent into dielectric dryer by discharge valve.
5) the dry moisture of separating out of internal heating fluidized bed drying machine and the weary gas of part superheated steam are after cyclone dust collectors dedusting, the brown coal powder of collecting is sent into dielectric dryer through discharge valve, weary gas enters electric cleaner dedusting after blower fan pressurization, dedusting Hou Yi returns to fluid bed in road, emptying after the air heat-exchange of another road through external heat exchanger and after being pressurizeed by blower fan.
6) air being heated by external heater enters dielectric dryer through ventilating system.
7) by controlling brown coal in the time of staying of dielectric drying chamber, be dried to after the moisture of requirement, brown coal are discharged and sent into finished product district.
8) air that passes into dielectric dryer is emptying by ventilating system together with dry moisture of separating out.
9) the whole return boiler recyclings of the condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine.
The water content of described wet brown coal is 30%-60%.
The invention has the beneficial effects as follows: by Superheated Steam Drying Technology and dielectric drying technology are combined, utilize the feature of these two kinds of dry technologies, respectively free moisture and the inherent moisture of drying brown coal, has the outstanding advantages such as energy-conservation, safety, environmental protection, water saving.This is environmentally friendly, resource-conserving clean coal technological project is applied to domestic brown coal power plant, colliery and Coal Chemical Engineering Project, by upgrading that brown coal pretreating process is undergone technological transformation, can obviously reduce fuel consumption and CO2 discharge, reduce the loss of corollary system, improve the overall efficiency of power plant, Coal Chemical Industry system.
Brief description of the drawings
Fig. 1 is process chart of the present invention.
Wherein, 1. feed bin, 2. conveying worm, 3. discharge valve I, 4. internal heating fluidized bed drying machine, 5. discharge valve II, 6. cyclone dust collectors, 7. discharge valve III, 8. blower fan I, 9. electric cleaner, 10. dielectric dryer, 11. external heat exchanger, 12. blower fan II.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
In Fig. 1, the device of the superheated steam of the present embodiment and high frequency combined drying brown coal, comprises internal heating fluidized bed drying machine 4, dielectric dryer 10 and the external heat exchanger 11 of a built-in heat exchanger;
Internal heating fluidized bed drying machine 4 is provided with feed bin 1, screw conveyer 2 and discharge valve I3, and feed bin 1 coordinates with screw conveyer 2, and screw conveyer 2 is connected with discharge valve I 3, and discharge valve I 3 is connected with internal heating fluidized bed drying machine 4.
Internal heating fluidized bed drying machine 4 is provided with cyclone dust collectors 6 and electric cleaner 9; Wherein weary gas is after cyclone dust collectors 6 dedustings, the dry powder of collecting is sent into finished product district, weary gas enters electric cleaner 9 dedustings after blower fan I8 pressurization, dedusting Hou Yi returns on road the fluid bed of internal heating fluidized bed drying machine 4, emptying after air heat-exchange after pressurizeing through external heat exchanger 11 and by blower fan II12 in another road, heated air enters dielectric dryer 10 through ventilating system.
The built-in heat exchanger of internal heating fluidized bed drying machine 4 is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine 4 is connected with superheated steam, and built-in heat exchanger is also connected with condensate system.
The discharging opening of charging aperture, discharging opening and the cyclone dust collectors 9 of described internal heating fluidized bed drying machine 4 connects respectively discharge valve I3, discharge valve II5 and discharge valve III7.
The whole return boiler recyclings of condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine 4.
Technique of the present invention is:
1) moisture 30%-60% wet brown coal are sent into the charging aperture of internal heating fluidized bed drying machine 4 by screw conveyer 2, discharge valve I 3 from feed bin 1, entered in fluid bed.
2) superheated steam enters fluid bed by internal heating fluidized bed bottom air compartment, after the equal wind of air-distribution device, enters bed.
3) saturated vapor is sent into its built-in heat exchanger as drying source.
4) by controlling the time of staying of brown coal in bed, be dried after its free moisture, brown coal are discharged and sent into dielectric dryer 10 by discharge valve II 5.
5) the dry moisture of separating out of internal heating fluidized bed drying machine 4 and the weary gas of part superheated steam are after cyclone dust collectors 6 dedustings, the brown coal powder of collecting is sent into dielectric dryer 10 through discharge valve III 7, weary gas enters electric cleaner 9 dedustings after 8 pressurizations of blower fan I, dedusting Hou Yi returns to fluid bed in road, emptying after the air heat-exchange of another road through external heat exchanger 11 and after being pressurizeed by blower fan II 12.
6) air being heated by external heater 11 enters dielectric dryer 10 through ventilating system.
7) by controlling brown coal in the time of staying of dielectric drying chamber, be dried to after the moisture of requirement, brown coal are discharged and sent into finished product district.
8) air that passes into dielectric dryer 10 is emptying by ventilating system together with dry moisture of separating out.
9) the whole return boiler recyclings of the condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine 4.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. a device for superheated steam and high frequency combined drying brown coal, is characterized in that, comprises internal heating fluidized bed drying machine, dielectric dryer and the external heat exchanger of at least one built-in heat exchanger; Internal heating fluidized bed drying machine is provided with feeding device and dust arrester I and dust arrester II; The built-in heat exchanger of internal heating fluidized bed drying machine is connected with saturated vapor, and the fluid bed of internal heating fluidized bed drying machine is connected with superheated steam, and built-in heat exchanger is also connected with condensate system; The weary gas of internal heating fluidized bed drying machine returns to fluid bed through the dedusting of dust arrester I and through pressue device pressurization, dust arrester II final dusting rear portion, emptying after the air heat-exchange of another part after external heat exchanger and pressurization, heated air enters dielectric dryer through ventilating system.
2. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal, is characterized in that, described dust arrester I is cyclone dust collectors, and described dust arrester II is electric cleaner; Wherein weary gas is after cyclone dust collectors dedusting, and the dry powder of collection is sent into finished product district, and weary gas enters electric cleaner dedusting after pressue device pressurization, and dedusting Hou Yi returns to fluid bed in road, emptying after the air heat-exchange of another road after external heat exchanger and pressurization.
3. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal, is characterized in that, the discharging opening of charging aperture, discharging opening and the cyclone dust collectors of described internal heating fluidized bed drying machine is all connected with discharge valve.
4. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal, it is characterized in that, described feeding device comprises feed bin, and feed bin coordinates with screw conveyer, screw conveyer is connected with discharge valve I, and discharge valve I is connected with internal heating fluidized bed drying machine.
5. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal, is characterized in that, described pressue device is blower fan.
6. the device of superheated steam as claimed in claim 1 and high frequency combined drying brown coal, it is characterized in that, described dielectric dryer tranmitting frequency is the electric wave of 6.78MHz or 13.56MHz or 27.12MHz or 40.68MHz, make dielectric molecule polarization repeatedly under the electric field action changing in material, the continuous frictional vibration of molecule between positive and negative two electrodes, produce heat energy, the moisture vaporization in material.
7. a technique for superheated steam and high frequency combined drying brown coal, comprises the following steps:
1) wet brown coal are sent into the charging aperture of internal heating fluidized bed drying machine by screw conveyer, discharge valve from feed bin, entered in fluid bed;
2) superheated steam enters fluid bed by internal heating fluidized bed bottom air compartment, after the equal wind of air-distribution device, enters bed;
3) saturated vapor is sent into its built-in heat exchanger as drying source;
4) by controlling the time of staying of brown coal in bed, be dried after its inherent moisture, brown coal are discharged and sent into dielectric dryer by discharge valve;
5) the dry moisture of separating out of internal heating fluidized bed drying machine and the weary gas of part superheated steam are after cyclone dust collectors dedusting, the brown coal powder of collecting is sent into dielectric dryer through discharge valve, weary gas enters electric cleaner dedusting after blower fan pressurization, dedusting Hou Yi returns to fluid bed in road, emptying after the air heat-exchange of another road through external heat exchanger and after being pressurizeed by blower fan;
6) air being heated by external heat exchanger enters dielectric dryer through ventilating system;
7) by controlling brown coal in the time of staying of dielectric drying chamber, be dried to after the moisture of requirement, brown coal are discharged and sent into finished product district;
8) air that passes into dielectric dryer is emptying by ventilating system together with dry moisture of separating out;
9) the whole return boiler recyclings of the condensed water in the built-in heat exchanger of internal heating fluidized bed drying machine.
8. the technique of superheated steam as claimed in claim 7 and high frequency combined drying brown coal, is characterized in that, in described step 1), the water content of wet brown coal is 30%-60%.
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| CN201210158454.2A CN102650494B (en) | 2012-05-21 | 2012-05-21 | Device and technology for drying lignite by jointly using superheated steam and high frequency |
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| CN103409198B (en) * | 2013-07-23 | 2014-12-10 | 山东天力干燥股份有限公司 | Drying, desulphurization and dehydration system and process for low-rank coal or coal slime |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201413003Y (en) * | 2009-06-04 | 2010-02-24 | 山东天力干燥设备有限公司 | Superheated steam lignite predrying system |
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
| CN202582098U (en) * | 2012-05-21 | 2012-12-05 | 山东天力干燥股份有限公司 | Device capable of drying lignite by combining superheated steam and high frequency |
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| RU2527904C2 (en) * | 2009-06-04 | 2014-09-10 | Шаньдун Тианли Драинг Эквипмент Ко, Лтд. | Multistage system and method of preliminary drying brown coal using superheated steam |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| CN201413003Y (en) * | 2009-06-04 | 2010-02-24 | 山东天力干燥设备有限公司 | Superheated steam lignite predrying system |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
| CN202582098U (en) * | 2012-05-21 | 2012-12-05 | 山东天力干燥股份有限公司 | Device capable of drying lignite by combining superheated steam and high frequency |
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