CN102661658B - Air flow and high frequency combined lignite drying device and process - Google Patents
Air flow and high frequency combined lignite drying device and process Download PDFInfo
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- CN102661658B CN102661658B CN201210158451.9A CN201210158451A CN102661658B CN 102661658 B CN102661658 B CN 102661658B CN 201210158451 A CN201210158451 A CN 201210158451A CN 102661658 B CN102661658 B CN 102661658B
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Abstract
The invention discloses an air flow and high frequency combined lignite drying device and an air flow and high frequency combined lignite drying process. The air flow and high frequency combined lignite drying device comprises an air flow dryer, a high frequency dryer, an external heat exchanger, a feeding device, a compression device, a dust removal system and a hot flue gas generation device, wherein a feeding part of the air flow dryer is connected with the feeding device; a flue gas inlet part of the air flow dryer is connected with the hot flue gas generation device; a discharge part of the air flow dryer is connected with the dust removal system; the dust removal system is connected with the high frequency dryer and the compression device I; the compression device I is connected with the external heat exchanger and the hot flue gas generation device; the external heat exchanger is connected with the high frequency dryer through a ventilation system and is also connected with the compression device II; and the external heat exchanger and the high frequency dryer can be emptied. The air flow and high frequency combined lignite drying device and method have the advantages of safety, energy conservation, high efficiency, environmental friendliness and the like.
Description
Technical field
The present invention relates to a kind of brown coal drying device and technique, be specifically related to device and the technique of a kind of air-flow and high frequency combined drying brown coal.
Background technology
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, and it has, and technique is simple, easy to operate, treating capacity large, be easy to the advantages such as industrialization, is comparatively ripe at present a kind of brown coal drying technology.
There is constant rate drying period and falling rate drying period in the hot flue gas drying of brown coal.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, improve capacity usage ratio and brown coal drying effect, the dry of brown coal inherent moisture needs to be optimized.
Summary of the invention
The present invention is for solving the problems of the technologies described above, device and the technique of a kind of air-flow and high frequency combined drying brown coal are provided, the free moisture of its employing pneumatic conveying drying technology drying brown coal, adopt the inherent moisture of dielectric drying technology drying brown coal, there is reasonable energy utilization, improve the advantage of brown coal drying effect.
For achieving the above object, the present invention adopts as following technical proposals:
A device for air-flow and high frequency combined drying brown coal, comprises pneumatic drier, dielectric dryer, external heat exchanger, feeding device, pressue device, dust pelletizing system, hot smoke generating appts; Charging place of pneumatic drier connects feeding device, and the cigarette place of entering of pneumatic drier connects hot smoke generating appts, and discharging place of pneumatic drier connects dust pelletizing system; Dust pelletizing system is connected with dielectric dryer and pressue device I, pressue device I is connected with hot smoke generating appts with external heat exchanger, external heat exchanger is connected with dielectric dryer by ventilating system, external heat exchanger is also connected with pressue device II, and described external heat exchanger and dielectric dryer can be emptying.
On described pneumatic drier, be also connected with blower mill.
Described feeding device comprises feed bin and feed auger machine, and feed bin coordinates with feed auger machine, and feed auger machine is connected with pneumatic drier.
Described hot smoke generating appts comprises oil burner and electric heater I and electric heater II, electric heater II import is connected with oil burner outlet, the outlet of electric heater II is connected with the cigarette place of entering of pneumatic drier, electric heater II is also connected with electric heater I outlet, and the import of electric heater I is connected with the outlet of pressue device I.
Described dust pelletizing system is made up of cyclone dust collectors and sack cleaner, cyclone dust collectors import is connected with pneumatic drier discharging place, cyclone dust collectors gas outlet is connected with sack cleaner import, between cyclone dust collectors discharging opening and dielectric drying machine inlet capable, is connected by transfer pipeline; Sack cleaner gas outlet is connected with pressue device I, and sack cleaner discharging opening is provided with discharge valve, between discharge valve and dielectric drying machine inlet capable, is connected by transfer pipeline.
Described pressue device I is blower fan.
A technique for air-flow and high frequency combined drying brown coal, it directly contacts and takes away part steam with brown coal taking hot flue gas as drying source, again through electromagnetic field of high frequency, further removes moisture from pneumatic drier brown coal out; Its detailed process is:
1) moisture 30%-60% wet brown coal are sent into pneumatic drier, the hot flue gas of hot flue gas water spray formation after heating is mixed to reduction oxygen content send into pneumatic drier as drying source with superheated steam.
2) the meet the demands feed coal of particle diameter is carried secretly to the drying tube rising and follow-up equipment by hot flue gas, and realizes and dehydrating in course of conveying.
3) by controlling the time of staying of brown coal in drying machine, be dried after its free moisture, brown coal are discharged and sent into deduster.
4) the dry moisture of separating out of pneumatic drier and coal dust flue gas are after deduster dedusting, and the brown coal powder of collection is sent into dielectric dryer.
5) air being heated by external heater enters dielectric dryer through ventilating system.
6) 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.
7) air that passes into dielectric dryer is emptying by ventilating system together with dry moisture of separating out.
In described step (2), do not meet entering in the blower mill that is arranged at pneumatic drier below compared with the sedimentation after sorting of gathering coal/powder of granularity requirements, further pulverized, again be transported to and in pneumatic drier, carry out selection by winnowing again, undesirable reprocessing through pulverizing the coal dust producing.
In described step (4), flue gas enters electric heater through pressue device pressurization Hou Yi road and mixes utilization with the hot flue gas that oil burner produces, emptying after the air heat-exchange of another road after external heat exchanger and pressurization.
Described dielectric dryer tranmitting frequency is 6.78MHz(or 13.56MHz, 27.12MHz, 40.68MHz) electric wave, make dielectric molecule (hydrone) 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 the combined drying technique of pneumatic conveying drying and dielectric drying, the free moisture to brown coal and inherent moisture are dried respectively, can be rationally, effectively utilize the energy.
The invention has the beneficial effects as follows: by pneumatic conveying 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, the advantages such as safe, energy-conservation, efficient, environmental protection.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 CO
2discharge, reduces the loss of corollary system, improves 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. feed auger machine, 3. blower mill, 4. pneumatic drier, 5. electric heater I, 6. electric heater II, 7. oil burner, 8. cyclone dust collectors, 9. sack cleaner, 10. discharge valve, 11. blower fan I, 12. dielectric dryers, 13 external heat exchanger, 14. 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 air-flow of the present embodiment and high frequency combined drying brown coal, it is made up of pneumatic drier 4, dielectric dryer 12, external heat exchanger 13, feed bin 1, feed auger machine 2, blower fan I11, blower fan II14, cyclone dust collectors 8, sack cleaner 9, electric heater I5, electric heater II6, oil burner 7, blower mill 3 and discharge valve 10.
Charging place of pneumatic drier 4 connects feed auger machine 2, and feed bin 1 coordinates formation feeding device with feed auger machine 2, be also connected with two desk fan coal pulverizers 3 on pneumatic drier 4.
The outlet of entering cigarette place connection electric heater II6 of pneumatic drier 4, electric heater II6 import is connected with oil burner 7 outlets, and electric heater II6 is also connected with electric heater I5 outlet, and the import of electric heater I5 is connected with the outlet of blower fan I11.
Discharging place of pneumatic drier 4 connects cyclone dust collectors 8 imports; Cyclone dust collectors 8 gas outlets are connected with sack cleaner 9 imports, between the discharging opening of cyclone dust collectors 8 and dielectric dryer 12 charging apertures, are connected by transfer pipeline; Sack cleaner 9 gas outlets are connected with pressue device I, and the discharging opening of sack cleaner 9 is provided with discharge valve 10, between discharge valve 10 and dielectric dryer 12 charging apertures, are connected by transfer pipeline, and sack cleaner 9 gas outlets are also connected with blower fan I11.
Blower fan I11 is connected with electric heater I5 with external heat exchanger 13, and external heat exchanger 13 is connected with dielectric dryer 12 by ventilating system, and external heat exchanger 13 is also connected with blower fan II14, and described external heat exchanger 13 and dielectric dryer 12 can be emptying.
Technique of the present invention is:
1) moisture 30%-60% wet brown coal are sent into pneumatic drier 4, oil burner 7 produces hot flue gas, the hot flue gas of hot flue gas water spray formation after electric heater II6 heating is mixed to reduction oxygen content send into pneumatic drier 4 as drying source with superheated steam.
2) meet the demands particle diameter feed coal by hot flue gas carry secretly to rise drying tube and follow-up equipment in, and realize and dehydrating in course of conveying, do not meet entering in the blower mill 3 that is arranged at pneumatic drier below compared with the sedimentation after sorting of gathering coal/powder of granularity requirements, further pulverized, again be transported to and in pneumatic drier 4, carry out selection by winnowing again, undesirable reprocessing through pulverizing the coal dust producing.
3) by controlling the time of staying of brown coal in pneumatic drier 4, be dried after its free moisture, brown coal are discharged and sent into cyclone dust collectors 8.
4) dry moisture and the coal dust flue gas of separating out of pneumatic drier 4 enters cyclone dust collectors 8 and sack cleaner 9 dedustings, the brown coal powder of collecting through cyclone dust collectors 8 and discharge valve 10 is sent into dielectric dryer 12, flue gas enters the hot flue gas that electric heater I5 produces with oil burner 7 and mixes utilization through blower fan I11 pressurization Hou Yi road, another road is emptying after external heat exchanger 13 and the air heat-exchange after blower fan II14 pressurizes.
5) air being heated by external heater 13 enters dielectric dryer 12 through ventilating system.
6) by controlling brown coal in the time of staying of dielectric drying chamber 12, be dried to after the moisture of requirement, brown coal are discharged and sent into finished product district.
7) air that passes into dielectric dryer 12 is emptying by ventilating system together with dry moisture of separating out.
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 (4)
1. a device for air-flow and high frequency combined drying brown coal, is characterized in that, comprises pneumatic drier, dielectric dryer, external heat exchanger, feeding device, pressue device, dust pelletizing system, hot smoke generating appts; Charging place of pneumatic drier connects feeding device, and the cigarette place of entering of pneumatic drier connects hot smoke generating appts, and discharging place of pneumatic drier connects dust pelletizing system; Dust pelletizing system is connected with dielectric dryer, pressue device I, pressue device I is connected with hot smoke generating appts with external heat exchanger respectively, external heat exchanger is connected with dielectric dryer by ventilating system, external heat exchanger is also connected with pressue device II, and described external heat exchanger and dielectric dryer can be emptying;
On described pneumatic drier, be also connected with blower mill;
Described feeding device comprises feed bin and feed auger machine, and feed bin coordinates with feed auger machine, and feed auger machine is connected with pneumatic drier;
Described hot smoke generating appts comprises oil burner and electric heater I and electric heater II, electric heater II import is connected with oil burner outlet, the outlet of electric heater II is connected with the cigarette place of entering of pneumatic drier, electric heater II is also connected with electric heater I outlet, and the import of electric heater I is connected with the outlet of pressue device I;
Described dust pelletizing system is made up of cyclone dust collectors and sack cleaner, and sack cleaner outlet is provided with discharge valve, and discharge valve is connected with dielectric dryer; Cyclone dust collectors import is connected with pneumatic drier discharging place, and cyclone dust collectors outlets is connected with sack cleaner, cyclone dust collectors outlet also with discharge valve and dielectric dryer between transfer pipeline be connected, sack cleaner exports and is also connected with pressue device I;
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, produces heat energy, the moisture vaporization in material.
2. a technique that adopts the drying brown coal of the device of air-flow as claimed in claim 1 and high frequency combined drying brown coal, is characterized in that, comprises the following steps:
1) moisture 30%-60% wet brown coal are sent into pneumatic drier, the hot flue gas of the reduction oxygen content that the hot flue gas after heating is formed after water spray mixes and sends into pneumatic drier as drying source with superheated steam;
2) the meet the demands feed coal of particle diameter is carried secretly to the drying tube rising and follow-up equipment by hot flue gas, and realizes and dehydrating in course of conveying;
3) by controlling the time of staying of brown coal in drying machine, be dried after its free moisture, brown coal are discharged and sent into deduster;
4) the dry moisture of separating out of pneumatic drier and coal dust flue gas are after deduster dedusting, and the brown coal powder of collection is sent into dielectric dryer;
5) air being heated by external heat exchanger enters dielectric dryer through ventilating system;
6) 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;
7) air that passes into dielectric dryer is emptying by ventilating system together with dry moisture of separating out.
3. the technique of the drying brown coal of the device of air-flow as claimed in claim 2 and high frequency combined drying brown coal, it is characterized in that, in described step (2), do not meet entering in the blower mill that is arranged at pneumatic drier below compared with the sedimentation after sorting of gathering coal/powder of granularity requirements, further pulverized, again be transported to and in pneumatic drier, carry out selection by winnowing again, undesirable reprocessing through pulverizing the coal dust producing.
4. the technique of the drying brown coal of the device of air-flow as claimed in claim 2 and high frequency combined drying brown coal, it is characterized in that, in described step (4), flue gas enters electric heater through pressue device pressurization Hou Yi road and mixes utilization with the hot flue gas that oil burner produces, emptying after the air heat-exchange of another road after external heat exchanger and pressurization.
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| CN201210158451.9A CN102661658B (en) | 2012-05-21 | 2012-05-21 | Air flow and high frequency combined lignite drying device and process |
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| CN103134291B (en) * | 2013-02-02 | 2015-02-04 | 云南中翼鼎东能源科技开发有限公司 | Production line used for drying coal slime |
| CN106974318B (en) * | 2017-03-01 | 2018-06-26 | 河南中烟工业有限责任公司 | A kind of technique of high frequency and thin plate combined drying pipe tobacco |
| CN107764042A (en) * | 2017-10-24 | 2018-03-06 | 蚌埠市徐善种植农民专业合作社 | A kind of drying dust removal device recycled |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102120941A (en) * | 2010-01-11 | 2011-07-13 | 天华化工机械及自动化研究设计院 | Lignite drying, sloshing dust-removing and washing process |
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Patent Citations (6)
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| CN101294765A (en) * | 2008-06-05 | 2008-10-29 | 神华集团有限责任公司 | Low rank coal high temperature flue gas drying method and device |
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