CN105567335B - A kind of coal dust pressure treatment method - Google Patents

A kind of coal dust pressure treatment method Download PDF

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Publication number
CN105567335B
CN105567335B CN201410535502.4A CN201410535502A CN105567335B CN 105567335 B CN105567335 B CN 105567335B CN 201410535502 A CN201410535502 A CN 201410535502A CN 105567335 B CN105567335 B CN 105567335B
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China
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coal
gas
coal dust
fine
duff
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CN201410535502.4A
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Chinese (zh)
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CN105567335A (en
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彭万旺
杨宝友
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彭万旺
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Abstract

The invention discloses a kind of coal dust pressure treatment method, including step:Coal dust to be prepared is subjected to particle separation, coarse granule coal dust of the granularity at 60 microns or more is separated, and collect respectively in different coal bunkers with fine breeze of the granularity less than 60 microns;Coarse granule coal dust is sent into coarse powder container, and is pressurizeed to the coarse granule coal dust;Fine breeze is sent into duff fine coal lock container, the inside ventilation terminal into duff fine coal lock container, which is passed through, pressurizes to fine breeze by pre-warmed inert gas;After the completion of pressurization, coarse granule coal dust and fine breeze are drawn off respectively.The coal dust of preparation is divided into coarse granule coal dust and fine breeze by the present invention, and pressurized treatments are carried out using different gas to coarse granule coal dust and fine breeze, and the diffused gas of coal lock container is recycled, so as to save or reduce to greatest extent the supplement needs of coal lock and coal process to inert gas, production cost is reduced.

Description

A kind of coal dust pressure treatment method

Technical field

The present invention relates to Coal Gasification Technology field, specifically a kind of coal dust pressure treatment method.

Background technology

For modern large size coal chemical industry using advanced Coal Gasification Technology, these Coal Gasification Technology majorities are operation with high pressure.How It is one of major technique difficulty of Coal Gasification Technology that coal under normal pressure, which is added in reaction under high pressure system,.Water-coal slurry pump pressurization adds Material and the lock boosting charging of dry coal coal dust are two kinds of mainstream coal dust condensation techniques, they have the characteristics of respective.To dry pulverized coal charging Speech, in order to improve whole energy efficiency, does not add in additional water in whole process into system.

Dry pulverized coal charging generally by coal lock be used as intermediate means coal dust is forced into from normal pressure it is consistent with gasification system Pressure.Coal lock operation is batch process, mainly locks a lower high pressure cut-off valve respectively having and pressurization, pressure loading valve by coal To realize.Coal is locked portion and is connect with low pressure coal bunker, and coal lock lower part is connect with high pressure coal bunker.First, it is that bottom stop valve is closed, subtracts Pressure valve is opened, and residual gas diffuses decompression during coal is locked, until closing bottom pressure relief valve after normal pressure.Normal pressure coal by gravity into Enter coal lock, etc. after material positions reach requirement, upper valve is closed.Gas-pressurized is passed through, and makes coal lock pressurization, until with high pressure coal bunker etc. Pressure, opens coal lock bottom valve, and coal falls into high pressure coal bunker from coal lock by gravity, is then shut off bottom valve.One is completed in this way A cycle.Circulating repetition carries out, high pressure coal bunker to be given to provide continuous pressure coal charge.

Coal lock technology and equipment etc. are very ripe, but it is also always persistently to occur coal lock cutting stock problems in actual mechanical process Execute-in-place is annoying, there is presently no effective solutions.Main reason is that coal dust, in pressure process, pressure is terraced Degree is squeezed the coal dust at most of particularly coal lock middle part, and coal dust has the molding trend of caking.After caking is built bridge, work as boosting Afterwards, lower part valve is opened, and material may be stopped in coal lock without declining.High pressure coal bunker is likely to occur in this way to lack material and cause to gasify Stove stops.The trend that caking is built bridge, increases as coal powder size becomes smaller;The presence of coal surface moisture greatly enhances caking effect It should.

In addition, coal dust pressurization generally requires inert gas, to prevent spontaneous combustion of pulverized coal.Inert gas is generally nitrogen or dioxy Change carbon, factory needs lasting separation to prepare these gases, and coal lock then continues to diffuse these gases, therefore increase factory Consumption.Coal lock diffused gas is diffused from high pressure to low pressure, and high pressure gas is directly diffused and concretely wastes utilisable energy.

Invention content

The technical problem to be solved in the present invention is to provide a kind of coal dust pressure treatment method, to coarse granule coal dust and fine breeze Pressurized treatments respectively by preheating gas and are uniformly distributed gas-pressurized, effectively overcome in coal lock container blanking process and easily tie The problem of block, and the diffused gas for recycling coal lock container is produced and used for next time, reduces gas consumption.

In order to solve the above-mentioned technical problem, the present invention takes following technical scheme:

A kind of coal dust pressure treatment method, includes the following steps:

Coal dust to be prepared is subjected to particle separation, coarse granule coal dust of the granularity at 60 microns or more is less than 60 with granularity The fine breeze of micron separates, and collect respectively in different coal bunkers;

Coarse granule coal dust is sent into coarse powder container, and is pressurizeed to the coarse granule coal dust;

Fine breeze is sent into duff fine coal lock container, is passed through into duff fine coal lock container by pre-warmed indifferent gas Body pressurizes to fine breeze;

After the completion of pressurization, coarse granule coal dust and fine breeze are drawn off respectively.

The method further includes:

Pressurization is completed after fine breeze is drawn off, and is pressed during the part gas-pressurized that duff fine coal is locked in container is diffused and is introduced into In gas collection tank, until the coal lock pressure of duff fine coal lock container drops to P1;

After the coal lock pressure of duff fine coal lock container is down to P1, duff fine coal is locked into the gas-pressurized in container and is diffused simultaneously It leads in low-pressure gas collecting tank, until the coal lock pressure of duff fine coal lock container drops to P2, wherein P2 is less than P1.

The method further includes:Clear water is added in medium pressure gas collecting tank and low-pressure gas collecting tank, gas is carried out Washing filtering.

The method further includes:The gas after filtering will be washed and be sent into recycle compressor pressurization, the gas after pressurization is protected It deposits and is used to produce next time.

When being passed through into duff fine coal lock container by pre-warmed inert gas, it is introduced into the inert gas and is located at Gas distributor in duff fine coal lock container, each portion that the inert gas is made to evenly spread in duff fine coal lock container Position.

The inert gas being passed through into duff fine coal lock container is pre-heated to 60~150 DEG C.

The inert gas being passed through in duff fine coal lock container is nitrogen or carbon dioxide.

To coarse granule coal dust under pressure using inert gas or the gas containing partial oxidation.

Coal charge to be prepared is carried out particle size separation by the present invention, is divided into coarse granule coal dust and fine breeze, and respectively to thick Pellet coal dust and fine breeze progress pressurized treatments, by preheating gas and are uniformly distributed gas-pressurized, effectively solve to add in coal lock The problem of coal dust easily lumps during pressure.And the diffused gas of coal lock is recycled, reduces the consumption of factory, is saved Save production cost.

Description of the drawings

Attached drawing 1 is the schematic device that the method for the present invention uses;

Attached drawing 2 locks container schematic diagram for fines of the present invention.

Specific embodiment

For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings.

Present invention is disclosed a kind of coal dust pressure treatment methods, include the following steps:

Coal dust to be prepared is carried out particle separation, by coarse granule coal dust and grain of the granularity at 60 microns or more by step S1 Fine breeze of the degree less than 60 microns separates, and collect respectively in different coal bunkers.Particle separation is carried out to coal dust, can be led to It crosses in preparation process, increases a separation process in Geldart-D particle link, coarse granule coal dust separation first is carried out to coal dust, will divide The coarse granule coal dust separated out is collected after separating in special coal bunker, and the fine breeze isolated then is collected special at another In coal bunker.Further, since coal has many types, therefore, granularity herein needs flexibly setting.According to the spy of different types of coal Property, the granularity boundary of particle separation can adjust between 45 to 100 microns.

Coarse granule coal dust is sent into coarse powder container, and pressurizes to the coarse granule coal dust by step S2.In the present embodiment In, it is pressurizeed to coarse granule coal dust using inert gas or is pressurizeed using the gas containing certain oxygen, to thick The gas of beans powder pressurization is using room temperature, without additionally heating.

Step S3 after coarse granule coal dust is disposed, fine breeze is sent into duff fine coal lock container, is locked to duff fine coal It is passed through in container and pressurizes by pre-warmed inert gas to fine breeze.First the inert gas is preheated, pre-add For heat to 60~150 DEG C, the temperature is more slightly higher than the temperature for preparing coal dust, which is led to and duff fine coal is locked In container, pressurize to fine breeze.The preheating gas also can directly use compressor outlet gas, by gas cooler Road keeps compressor exit temperature so that the gas has certain temperature, can be used directly to pressurize to fine breeze.

After the completion of coarse granule coal dust and fine breeze pressurization, coarse granule coal dust and fine breeze are drawn off respectively by step S4, complete Into pressurized treatments.

In addition, in step s3, when being passed through into duff fine coal lock container 3 by pre-warmed inert gas, make this Inert gas is uniformly distributed to each position in duff fine coal lock container, and gas-pressurized is sent to coal lock container as far as possible Each area of space, and as possible reduce gas distributed point distance, it is ensured that the fine breeze of all directions can be pressurized place Reason.It as shown in Figure 2, can be in duff fine coal for each position that gas is made uniformly to be distributed in duff fine coal lock container Locking one gas distributor of setting, the gas distributor in container may include a supervisor, which extends to duff fine coal lock container Interior bottom, the inert gas of outside enter through the supervisor in duff fine coal lock container, and more positions are set on the side wall of the supervisor Different air outlet pipes is put, several ventholes are set again in air outlet pipe, so that the inert gas entered by supervisor is through going out Venthole on tracheae is discharged into duff fine coal lock container, since venthole is distributed in each portion in duff fine coal lock container Position, therefore, which can be uniformly dispersed in each position, and comprehensive pressurization is carried out to fine breeze, And it can realize individual control if necessary, i.e., by the way that air outlet pipe is controlled to realize that the gas in which orientation is discharged, which Gas in orientation does not need to.Can be nitrogen or carbon dioxide to the inert gas that fine breeze pressurizes.

In addition, the pressure treatment method further includes:

Step S5, pressurization are completed after fine breeze is drawn off, and the pressure in duff fine coal lock container was originally P0(Such as 4.0 MPa), the part gas-pressurized that duff fine coal is locked in container is diffused and is introduced into medium pressure gas collecting tank, until duff fine coal The coal lock pressure of lock container drops to P1(Such as 0.6MPa);After the coal lock pressure of duff fine coal lock container is down to P1, by duff Gas-pressurized in fine coal lock container is diffused and is led in low-pressure gas collecting tank, until the coal of duff fine coal lock container locks pressure Drop to P2(Such as 0.05MPa), wherein P2 is less than P1.

Step S6 locks the gas directly collected in container due to being contacted with coal dust from duff fine coal, in the gas Inevitably containing certain dust, can be recycled again for the gas of collection, in medium pressure gas collecting tank and low-pressure gas Clear water is added in collecting tank, washing filtering is carried out to gas, the dust-filtering in gas is fallen, gas is made to be free of dust.It is and thin Remaining micro pressure gas directly can be diffused individually after dedusting in coal dust coal lock container.

In order to smoothly collect gas, gas be washed and voltage stabilizing etc., at least two sets of high positions/low level phase coupling is established Gas collection/washing/voltage-stabilizing system of conjunction, as shown in Figure 1, water as pressure head stable, while also to diffused gas into Row washing function;In first set coupled system, low level tank is on ground, and gravity tank is positioned at 60 meters an or so high positions, low level tank bottom Portion has water pipe to be connected with high-order pot bottom, and the top of two tanks also has gas pipeline to be connected.In second set of coupled system, low level tank On ground, gravity tank is positioned at 5 meters an or so high positions, and low level pot bottom has water pipe to be connected with high-order pot bottom, the top of two tanks There is gas pipeline to be connected, realize the convenience of operation.

Gas after the washing filtering in medium pressure gas collecting tank and low-pressure gas collecting tank is sent into cycle pressure by step S7 Contracting machine pressurizes, and the gas after pressurization is preserved and is used to produce next time.It is sent in the relevant pressure grade of recycle compressor (If the first order is 0.6 MPa), the pressure rating needed for the gas pressurized to air source of the feeding recycle compressor(Such as 4.5MPa) Pressurization is locked for next dant to use.

It is recycled by the gas after the coal dust pressurization to preparation, and the coal lock pressurization for next time uses, and has Effect saves consumption, saves production cost.

It should be noted that described above is not the restriction to technical scheme of the present invention, do not departing from the present invention's Under the premise of creating design, any obvious replacement is within protection scope of the present invention.

Claims (7)

1. a kind of coal dust pressure treatment method, includes the following steps:
Coal dust to be prepared is subjected to particle separation, granularity is micro- less than 60 in 60 microns or more of coarse granule coal dust and granularity The fine breeze of rice separates, and collect respectively in different coal bunkers;
Coarse granule coal dust is sent into coarse powder container, and is pressurizeed to the coarse granule coal dust;
Fine breeze is sent into duff fine coal lock container, is passed through into duff fine coal lock container by pre-warmed inert gas pair Fine breeze pressurizes;After the completion of pressurization, coarse granule coal dust and fine breeze are drawn off respectively;
Pressurization is completed after fine breeze is drawn off, and the part gas-pressurized that duff fine coal is locked in container is diffused and introduces medium pressure gas In collecting tank, until the coal lock pressure of duff fine coal lock container drops to P1;
After the coal lock pressure of duff fine coal lock container is down to P1, the gas-pressurized that duff fine coal is locked in container is diffused and drawn Into low-pressure gas collecting tank, until the coal lock pressure of duff fine coal lock container drops to P2, wherein P2 is less than P1.
2. coal dust pressure treatment method according to claim 1, which is characterized in that the method further includes:It calms the anger in Clear water is added in body collecting tank and low-pressure gas collecting tank, washing filtering is carried out to gas.
3. coal dust pressure treatment method according to claim 2, which is characterized in that the method further includes:It will be washed Gas after filter is sent into recycle compressor pressurization, and the gas after pressurization is preserved and is used to produce next time.
4. the coal dust pressure treatment method according to claim 3, which is characterized in that be passed through into duff fine coal lock container During by pre-warmed inert gas, the inert gas is made to be introduced into the gas distributor being located in duff fine coal lock container, Each position that the inert gas is made to evenly spread in duff fine coal lock container.
5. the coal dust pressure treatment method according to claim 4, which is characterized in that be passed through into duff fine coal lock container Inert gas be pre-heated to 60~150 DEG C.
6. the coal dust pressure treatment method according to claim 5, which is characterized in that described to be passed through duff fine coal lock container Interior inert gas is nitrogen or carbon dioxide.
7. the coal dust pressure treatment method according to claim 1, which is characterized in that coarse granule coal dust under pressure Gas using inert gas or containing partial oxidation.
CN201410535502.4A 2014-10-13 2014-10-13 A kind of coal dust pressure treatment method CN105567335B (en)

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CN105567335B true CN105567335B (en) 2018-06-29

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1868843A (en) * 2005-05-27 2006-11-29 上海金申德粉体工程有限公司 Air-flow conveying device for both powder and granular material
JP2007056100A (en) * 2005-08-23 2007-03-08 Babcock Hitachi Kk Char-conveying apparatus equipped with coarse grain separation function and coal gasification system
CN102154029A (en) * 2009-12-21 2011-08-17 南方服务有限公司 A high pressure feeder and method of operation to feed granular or fine materials
CN103112720A (en) * 2013-02-18 2013-05-22 安徽晋煤中能化工股份有限公司 High pressure conveyance gas recovery method
CN103146435A (en) * 2013-02-18 2013-06-12 上海锅炉厂有限公司 High-moisture coal pulverizing, drying and conveying apparatus and method thereof
CN203346345U (en) * 2013-04-28 2013-12-18 上海泽玛克敏达机械设备有限公司 Coaling system utilizing byproduct carbon dioxide gas to perform pressure charging and relief on coal locks

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1868843A (en) * 2005-05-27 2006-11-29 上海金申德粉体工程有限公司 Air-flow conveying device for both powder and granular material
JP2007056100A (en) * 2005-08-23 2007-03-08 Babcock Hitachi Kk Char-conveying apparatus equipped with coarse grain separation function and coal gasification system
CN102154029A (en) * 2009-12-21 2011-08-17 南方服务有限公司 A high pressure feeder and method of operation to feed granular or fine materials
CN103112720A (en) * 2013-02-18 2013-05-22 安徽晋煤中能化工股份有限公司 High pressure conveyance gas recovery method
CN103146435A (en) * 2013-02-18 2013-06-12 上海锅炉厂有限公司 High-moisture coal pulverizing, drying and conveying apparatus and method thereof
CN203346345U (en) * 2013-04-28 2013-12-18 上海泽玛克敏达机械设备有限公司 Coaling system utilizing byproduct carbon dioxide gas to perform pressure charging and relief on coal locks

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