CN104406395B - Trigger the dry method of coal using cold plasma - Google Patents
Trigger the dry method of coal using cold plasma Download PDFInfo
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- CN104406395B CN104406395B CN201410681442.7A CN201410681442A CN104406395B CN 104406395 B CN104406395 B CN 104406395B CN 201410681442 A CN201410681442 A CN 201410681442A CN 104406395 B CN104406395 B CN 104406395B
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Abstract
Trigger coal dry method that raw coal is worn into the particle or powder of the mesh of granularity 20~200 the present invention relates to a kind of utilization cold plasma；Coal sample is loaded into plasm reaction cavity；Air or non-flammable gases and its admixture of gas are passed through reaction chamber；Under atmospheric pressure, 5000~20000V alternating voltage is applied at electrode two ends using high voltage power supply, 30 100W input power makes gas discharge, and the time is 5 30min, thus reaches that plasma guides the purpose of coal sample drying process.The present invention triggers gas discharge by plasma discharge apparatus, by the effect of the free radical and free electron and coal particle that are produced in the electric field and plasma of change, change the distribution of charges in coal particle surface and duct, reduction and the binding ability of hydrone, so as to reach the purpose of drying and dehydrating.Compared with conventional method, plasma dry process has that dehydration rate is high, rate of drying is fast, it is environmentally friendly the features such as.
Description
Technical field
The present invention relates to a kind of drying means of coal, particularly with the drying means of water content lignite high.It belongs to coal
Processing technique field, especially a kind of cold plasma trigger the coal method for dehydrating rapidly and efficiently.
Background technology
Lignite is a kind of relatively low coal of degree of coalification.It worldwide reserves it is larger, and be easy to exploitation.But
It is because brown moisture in coal and ash content are larger, thus to cause on its utilization aborning very big influence.First, lignite exists
It is easy to weathering fragmentation in air, and burning-point is low, and spontaneous combustion easily occurs for a large amount of long-term storages, thus is not easy to storage.Meanwhile, it is high
Moisture result in cost of transportation and increase, and especially easily freezes in northern area and is difficult to load and unload.Other high-moisture is also resulted in
The problem of caloric value of lignite is low, the economic benefit for accordingly acting as fuel is poor.The dehydration process of lignite is most common
Lignite quality-improving processing technique.Lignite can increase substantially caloric value by drying process, while can also reduce combustion process
Harmful gas emission, this reasonable utilization to lignite has great significance.
It is several that the dehydration of lignite is broadly divided into mechanical dehydration, dehydration by evaporation and non-evaporating dehydrolysis etc..Wherein mechanical dehydration is
The bulk water and a small amount of capillary water in coal sample are removed by methods such as centrifugation, extruding, the problem of dehydration rate is low is faced with, therefore very
Difficulty meets the requirement of lignite process for upgrading.Dehydration by evaporation is to make the moisture gas in coal sample using the method for directly or indirectly heating
Change, so as to reach dry purpose.But the method one side energy consumption is larger, there is explosion danger in another aspect convection drying,
And the water consumption of contact drying is larger.Non-evaporating dehydrolysis is dried using high steam, can obvious reducing energy consumption, so
And there is also the insufficient shortcoming of moisture removal.At present, going deep into surface chemistry research, electrochemical method is received and ground
Study carefully the attention of worker, and be applied to the dehydration of the washing process fine cleaned coal of coal separation, this is our dewatering process
There is provided new thinking.
Plasma be deprived of by part electronics after atom and atomic group ionization after the positron-electron that produces constitute
Ionized gas shape material, by free electron, the ion of positively charged and unionized atom composition.Cold plasma is a kind of
The plasma of thermodynamics nonequilibrium condition, it has typical plasma properties, and electron temperature is higher, but bulk temperature compared with
It is low, or even close to normal temperature, therefore cold plasma processing procedure has treatment effeciency and relatively low energy consumption higher.Some wait from
To the dehydration of solid powder significantly, but work before is seldom used daughter process.In plasma discharge
During, the electric field of change and the free radical of generation can change solid particles surface distribution of charges with free electron, reduce solid
Suction-operated of the body particle to water.The generation free radical and fuel factor in discharge process can also make full use of dehydration simultaneously
In.
The content of the invention
The purpose of the present invention is directed to the equipment complexity that existing brown coal drying technology is present, and high energy consumption, lignite dehydration is not filled
Grade deficiency, propose a kind of to trigger the dry method of coal using cold plasma.This method is easy to operate, mild condition, dehydration
Rate is high, and processing speed is fast, environmentally friendly.
The present invention is achieved through the following technical solutions：
A kind of method that low temperature plasma triggers coal drying process；It is characterized in that：The processing method includes following step
Suddenly：
(1) raw coal is worn into the particle or powder of the mesh of granularity 20~200；
(2) coal sample is loaded into plasm reaction cavity；
(3) air or non-flammable gases and its admixture of gas are passed through reaction chamber；
(4) under atmospheric pressure, the alternating voltage of 5000~20000V, 30- are applied at electrode two ends using high voltage power supply
100W input power makes gas discharge, and the time is 5-30min, thus reaches that plasma guides the mesh of coal sample drying process
's.
And, described raw coal is the larger coals of water content such as lignite, jet coal, bottle coal.
Moreover, the plasma discharge gas can be the mixture of air, nitrogen, argon gas, helium or more gas.
Moreover, the gas discharge form can be dielectric barrier discharge or corona discharge.
Prior art is compared, and the drying process process is simple of coal, dehydration rate are high under action of plasma, and rate of drying is fast,
Energy-conserving and environment-protective, the program is particularly suitable for use in the high lignite of water content, jet coal, bottle coal etc..
For when the deficiency of brown coal drying method, we trigger dehydration by using plasma, normal pressure, room temperature or compared with
By the process that dehydrates of AC gas discharge initiation coal under low gas temperature (being less than 150 DEG C), process is simple and pacify
It is complete quick, with dewatering efficiency higher.
The advantages of the present invention are：
1., the present invention relates to a kind of coal drying method, it is to trigger gas discharge by plasma discharge apparatus, is passed through
The free radical and free electron that are produced in the electric field and plasma of change and the effect of coal particle, change coal particle surface and hole
Distribution of charges in road, reduces the binding ability with hydrone, so as to reach the purpose of drying and dehydrating.Compared with conventional method,
Plasma dry process has the characteristics of dehydration rate is high, rate of drying is fast.
2. the present invention is used plasma dry method rate of drying is fast, temperature close to normal temperature, on the one hand to ature of coal sheet
Body changes smaller, the huge energy consumption of conventional method mechanical presses and high temperature evaporation is on the other hand avoided, relative to conventional method
More energy-conservation.
3. the plasma dry method that the present invention is used avoids the complicated drying process of conventional method, it is not necessary to extra
Other chemical reagent are added, is more easily operated, and to more environment-friendly.
Brief description of the drawings
Fig. 1 is flat type dielectric barrier discharge drying equipment schematic diagram；
Fig. 2 is the lignite sample dehydrating effect curve of different disposal time；
Fig. 3 is different grain size lignite sample saturation moisture content and the dehydrating effect schematic diagram for handling 30min；
Fig. 4 is coaxial tubular type dielectric barrier discharge drying equipment schematic diagram；
Wherein：1- high-field electrodes；2- earth electrodes；3- discharge mediums；4- coal samples to be dried；5- plasma generators；
6- air inlet gas circuits；7- is vented gas circuit.
Specific embodiment
The present invention is described in further detail by following examples combination accompanying drawing.But the technology contents that the present embodiment is described are to say
Bright property, rather than limited, protection scope of the present invention should not be limited to according to this.
Embodiment 1
It is coal dusts more than 200 mesh that lignite is worn into fineness, and coal dust then is added into flat type dielectric barrier discharge reaction
In chamber, as shown in Figure 1.Argon gas is passed through to reaction chamber to completely cut off air, and argon gas flow velocity is 50mL/min.Using high voltage power supply two
Apply 7000V alternating currents between electrode, power frequency is 8kHz.Treatment time is 6min, 9min, 15min, 30min.
After processing procedure terminates, the lignite sample moisture content to the different disposal time is analyzed, as shown in Figure 2.With
Process time increases, and brown moisture in coal is gradually removed, the plasma soma of the lignite sample of water content 25% or so in 30min
Water content is 5% or so after dry processing procedure.
Embodiment 2
Lignite is worn into the coal dust that fineness is respectively 20 mesh, 40 mesh, 60 mesh, 100 mesh and 200 mesh, then coal dust is added
In flat type dielectric barrier discharge reaction chamber.Argon gas is passed through to reaction chamber to completely cut off air, argon gas flow velocity is 10mL/min.Utilize
High voltage power supply applies 7000V alternating currents between electrodes, and power frequency is 8kHz.Treatment time is 30min.
After processing procedure terminates, the water content to varigrained lignite sample is analyzed, as shown in Figure 3.It can see
Go out the method has good dehydrating effect for varigrained lignite sample.
Embodiment 3
Bottle coal is worn into the coal dust of 200 mesh, added in flat type dielectric barrier discharge reaction chamber.Helium is passed through to reaction chamber
To completely cut off air, helium flow velocity is 10mL/min.Apply 20000V alternating currents between electrodes using high voltage power supply, electric current is frequently
Rate is 8kHz.Process time is 5min.
Processing procedure finds that plasma treatment procedure has good dehydrating effect to bottle coal sample after terminating.
Embodiment 4
Jet coal is worn into the coal dust of 200 mesh, in addition corona discharge reaction chamber.To reaction chamber be passed through dry air with
Moisture is taken away, air velocity is 10mL/min.Apply 5000V alternating currents, power frequency between electrodes using high voltage power supply
It is 8kHz.Process time is 30min.
Processing procedure finds that plasma treatment procedure has preferable dehydrating effect, coal sample water content to coal sample after terminating
Drop to less than 5%.
Embodiment 5
It is coal dusts more than 200 mesh that lignite is worn into fineness, then adds coaxial tubular type dielectric barrier discharge anti-coal dust
Answer in chamber, as shown in Figure 4.Nitrogen is passed through to reaction chamber to completely cut off air, and nitrogen flow rate is 50mL/min.Existed using high voltage power supply
Apply 5000V alternating currents between two electrodes, power frequency is 10kHz.Treatment time is 30min.
Processing procedure finds that plasma treatment procedure has good dehydrating effect to lignite sample after terminating.
The present invention triggers gas discharge by plasma discharge apparatus, by being produced in the electric field and plasma of change
Free radical and free electron and coal particle effect, change the distribution of charges in coal particle surface and duct, reduction and moisture
The binding ability of son, so as to reach the purpose of drying and dehydrating.Compared with conventional method, plasma dry process has dehydration rate
High, rate of drying is fast, it is environmentally friendly the features such as.
Claims (3)
1. a kind of method that utilization low temperature plasma triggers coal drying process；It is characterized in that：
(1) raw coal is worn into the particle or powder of the mesh of granularity 20~200；
(2) coal sample is loaded into plasm reaction cavity；
(3) mixture of air or nitrogen, argon gas, helium or more gas is passed through reaction chamber；
(4) under atmospheric pressure, the alternating voltage of 5000~20000V is applied at electrode two ends using high voltage power supply, 30-100W's
Input power makes gas discharge, and the time is 5-30min, thus reaches the purpose that plasma guides coal sample drying process.
2. according to the method described in claim 1, it is characterized in that described raw coal is lignite, jet coal or bottle coal.
3. according to the method described in claim 1, it is characterized in that described gas discharge form is dielectric barrier discharge or corona
Electric discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681442.7A CN104406395B (en) | 2014-11-24 | 2014-11-24 | Trigger the dry method of coal using cold plasma |
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|---|---|---|---|
| CN201410681442.7A CN104406395B (en) | 2014-11-24 | 2014-11-24 | Trigger the dry method of coal using cold plasma |
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| CN104406395A CN104406395A (en) | 2015-03-11 |
| CN104406395B true CN104406395B (en) | 2017-07-11 |
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| CN201410681442.7A Expired - Fee Related CN104406395B (en) | 2014-11-24 | 2014-11-24 | Trigger the dry method of coal using cold plasma |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107218788A (en) * | 2017-06-16 | 2017-09-29 | 泰州市姜堰新型纺织有限公司 | A kind of special weaving face fabric drying unit |
| NZ765167A (en) * | 2018-03-09 | 2022-01-28 | Green Eco Int Pty Ltd | System and method for food waste decomposition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1131564A (en) * | 1994-10-11 | 1996-09-25 | 庄臣及庄臣医药有限公司 | Plasma-enhanced vacuum drying |
| CN1861197A (en) * | 2006-03-16 | 2006-11-15 | 王立飞 | Method for continuous hypothermal desiccation and sterilization of bony tissue, and equipment therefor |
| CN102259364A (en) * | 2010-05-26 | 2011-11-30 | 朱斌 | Wood drying and modification method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003264978A1 (en) * | 2002-04-29 | 2003-11-17 | Solid Solutions Limited | Material dewatering apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1131564A (en) * | 1994-10-11 | 1996-09-25 | 庄臣及庄臣医药有限公司 | Plasma-enhanced vacuum drying |
| CN1861197A (en) * | 2006-03-16 | 2006-11-15 | 王立飞 | Method for continuous hypothermal desiccation and sterilization of bony tissue, and equipment therefor |
| CN102259364A (en) * | 2010-05-26 | 2011-11-30 | 朱斌 | Wood drying and modification method |
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Address after: 300350 District, Jinnan District, Tianjin Haihe Education Park, 135 beautiful road, Beiyang campus of Tianjin University Patentee after: Tianjin University Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92, Tianjin University Patentee before: Tianjin University |
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