CN105627345A - Pulverized coal preparation system and pulverized coal preparation method - Google Patents
Pulverized coal preparation system and pulverized coal preparation method Download PDFInfo
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- CN105627345A CN105627345A CN201610054305.XA CN201610054305A CN105627345A CN 105627345 A CN105627345 A CN 105627345A CN 201610054305 A CN201610054305 A CN 201610054305A CN 105627345 A CN105627345 A CN 105627345A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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Abstract
The invention discloses a pulverized coal preparation system and a pulverized coal preparation method. The pulverized coal preparation system comprises a heat source device, a drying device, a pulverizing device, a powder colleting implement, an air blower, a bag-type dust collector and an induced draft fan. The smoke outlet end of the drying device is connected with the smoke inlet end of the bag-type dust collector. The smoke outlet end of the bag-type dust collector is connected with the induced draft fan. Dry raw materials of the drying device are fed into the pulverizing device. a closed grinding circulatory system is formed among the pulverizing device, the powder colleting implement and the air blower. The pulverized coal preparation system further comprises a balance air pipe. The outlet end of the air blower is then connected with the smoke inlet end of the bag-type dust collector through the balance air pipe. According to the pulverized coal preparation system and the pulverized coal preparation method, full negative pressure running of a system air leak position is achieved, and accordingly the purpose of clean production is achieved. The temperature of powder collected by the bag-type dust collector is lowered, and the possibility of powder spontaneous combustion and explosion is reduced, so that the safety performance of the pulverized coal preparation system is significantly improved. Compared with the traditional process, the number of equipment and sites are reduced, and the cost is reduced.
Description
Technical field
The invention belongs to powder body manufacture field, relate to feed coal be raw material a kind of coal dust preparation system and the method for pulverized coal preparation.
Background technology
Pulverized coal preparation refers to the coal dust that block raw coal grinds to form certain fineness, to provide the essential accessory such as various pulverized-coal fired boiler, heating furnace, cement kiln, steel-making blast furnace. Generally it is made up of thermal source, raw coal conveyer, dehydrator, coal pulverizer, cleaner unit, blower fan, pulverized coal channel, airduct, chimney etc.
As the auxiliary facility of pulverized coal combustion system, the powder coal milling system of compartmentalization construction obtains quick utilization. Especially process is stored with dry method pulverized coal preparation, coal dust, if dealing with improperly in pulverized coal preparation, storage, transport, not only easy contaminated environment, even there is powder process security incident, cause casualties and device damage.
Spontaneous combustion of pulverized coal is because coal dust deposition, and surface starts oxidation, releases heat and urgees to elevate the temperature, and accelerated oxidation, heat release and intensification again reaches burning-point and be concurrently conigenous combustion after certain time. For different coals, along with the raising of coal volatile matter, the rising of fineness of pulverized coal, oxygen content increase, the probability of spontaneous combustion of pulverized coal increases.
The key element condition of coal dust explosion is: coal dust reaches certain particle size, has certain volatile matter, is dispersed into certain density suspended state, and system has enough oxygen contents, has enough ignition energies it is possible to blast. Namely combustible mass concentration, oxygen concentration reaches limit value and temperature reaches more than burning-point. The coal powder ignition point that volatile matter is high is relatively low, is more easy to and reaches burning-point; The more thin specific surface area of granularity is more big, and the area contacted with oxygen is more big, more oxidizable; The more low required ignition energy of moisture is more low; Therefore, the coal dust that volatile matter is more high, granularity is more thin, moisture is more low is more easy to blasts.
Dry method flouring technology is divided into drying, coal-grinding integral type and drying, coal-grinding split two kinds.
The technical process that baking operation and coal-grinding operation unite two into one is: the flue gas that being generally adopted thermal source provides is directly entered coal pulverizer, dry in coal pulverizer and pulverizing carries out simultaneously, the coal dust of finished product gathers dust through dust-precipitator, the power that flue gas is provided by circulating fan, it is again introduced into coal pulverizer after mixing with thermal source flue gas in part through circulation airduct, forming a closed cycle, another part passes through chimney discharged to air. This technique is suitable for extensive powder process, and flow process is short, equipment is few, specific investment is little, and safety precautions requires height. This technique suffers from the drawback that
(1) raw coal of high-moisture is likely to result in cloth bag condensation and sticks with paste bag;
(2) there may be spark when coal pulverizer grinding powder coal, be a kind of potential safety hazard in hot environment;
(3) in order to prevent paste bag from often improving disintegrating outlet temperature, the temperature of coal dust is also higher simultaneously, brings certain security risk to the conveying of coal dust and storage.
The process characteristic that baking operation and coal-grinding operation are divided into two is that baking operation separates with coal-grinding operation, is suitable for middle and small scale powder process, and safety precautions is relatively easy, but flow process is slightly long, equipment is many, specific investment is slightly larger. Independent coal-grinding operation is shown in accompanying drawing 2, its general technological process is: the boosted equipment of raw coal enters coal pulverizer, coal pulverizer, aerator, powder collector form a closed cycle, under the power that aerator provides, raw coal is ground in flour mill, the coal dust of finished product is collected in powder collector, and the finished product coal dust in powder collector delivers to finished product storage tank through powder conveying device. Owing to system is in an air balance state, it is achieved the negative pressure at place of leaking out, the total blast volume of system will certainly be increased, so must by outside the air quantity discharge system increased of leaking out. Setting up balance wind pipe at blower export, balance wind pipe outlet connects cloth bag powder collector, the wind powder mixture that balance wind pipe is released gather dust in cloth bag powder collector after discharged to air, thus achieve the negative pressure state at place of leaking out. Coal dust collected by cloth bag powder collector delivers to finished product storage tank through defeated powder equipment. When technique needs the low coal dust of moisture content, it is necessary for combining drying course and coal-grinding process, sees accompanying drawing 3. The drying course flow process increased is: raw coal delivers to drying plant through raw coal conveyer device, and the high-temperature flue gas provided by thermal source in drying plant is dried, and enters after sack cleaner gathers dust through air-introduced machine and chimney discharged to air after flue gas drying raw coal. If simply simply combining, now just run into a following difficult problem:
(1) what sack cleaner was collected is the coal dust that carries of dehydrator exiting flue gas, and its fine size, moisture are low. Coal dust is more thin, and moisture content is more low, spontaneous combustion of pulverized coal, blast probability more big;
(2) balance wind pipe still sets up cloth bag powder collector, adds the complexity of system, and floor space is relatively big, and cost of investment uprises, and due to the limited height of gas discharging, the ambient temperature around powder process workshop also can rise;
(3) coal dust that cloth bag powder collector is collected needs powder conveying device to carry, and which increases the complexity of system and potential safety hazard;
(4) air quantity of balance wind pipe cannot regulate, it is impossible to system negative pressure according to actual needs regulates this parameter;
(5) owing to being not equipped with automatic ash removing device, the coal dust that cloth bag powder collector is collected needs artificial rapping to get off, and workload is very big;
(6) along with the long-play of cloth bag powder collector, its resistance increases, and the wind of balance wind pipe can be caused not in time not discharge smoothly if processing, causing the malleation at system air leakage place, and coal dust escapes into contaminated environment outside system.
Summary of the invention
For defect of the prior art, present invention aim at providing a kind of coal dust preparation system, solve the problem of cleanly production and raising security of system in existing dry process coal dust process.
Another object of the present invention is to provide a kind of method utilizing described coal dust preparation system to carry out pulverized coal preparation.
To achieve these goals, the present invention takes techniques below scheme:
A kind of coal dust preparation system, including heat power supply device, drying unit, milling device, powder collector and aerator, sack cleaner and air-introduced machine, heat power supply device provides heat energy for drying unit, and the smoke outlet of drying unit is connected with the gas approach end of sack cleaner; The smoke outlet of sack cleaner is connected with air-introduced machine; Milling device sent into by the dry raw material of drying unit, the wind powder mixture port of export of milling device is connected with the wind powder mixture entrance point of powder collector, the wind powder mixture port of export of powder collector is connected with the entrance point of aerator, the port of export of aerator is connected with the wind powder mixture entrance point of milling device, the grinding blood circulation of closing is formed between milling device, powder collector, aerator, also including balance wind pipe, the port of export of aerator is connected with the gas approach end of sack cleaner further through balance wind pipe.
Further, described balance wind pipe is provided with balance wind and regulates valve.
Further, the outlet of described air-introduced machine is connected with chimney.
Further, the smoke outlet of described heat power supply device is connected with the entrance point of the flue gas of drying unit.
Further, also including raw coal screening bucket and raw coal conveyer device, coal is sent into drying unit by raw coal conveyer device by raw coal screening bucket.
Further, also including elevator, the dry material outlet end of described drying unit is closed with elevator feed end and is connected, and elevator discharge end is closed with the charging aperture of milling device and is connected.
Further, also include powder conveying device A, powder conveying device B, powder conveying device C and powder-storage bin, the coal dust of sack cleaner is delivered to powder conveying device B by powder conveying device A, the coal dust of powder collector also delivers to powder conveying device B, coal dust in powder conveying device B gives powder conveying device C, coal dust is delivered to powder-storage bin by powder conveying device C, or the coal dust in powder conveying device B and the coal dust in powder conveying device C can also be delivered in powder-storage bin separately through powder conveying device.
Utilize the method that described coal dust preparation system carries out pulverized coal preparation, raw coal sends into dehydrator through raw coal screening bucket and raw coal conveyer device, raw coal is dried by the flue gas that heat power supply device is delivered to, flue gas after drying is drawn onto sack cleaner by air-introduced machine and gathers dust, then through chimney discharged to air; Flour mill delivered to by the boosted machine of raw coal dried, and the power cycle provided by aerator is ground, and the qualified fine coal of major part is collected in cyclone separator, and underproof fine coal is fallen and carried out regrinding in flour mill, until qualified; Fine coal qualified on a small quantity enters blower inlet, the balance wind pipe of blower export place erection, wind powder mixture is delivered to sack cleaner through this airduct and is gathered dust, trap the coal dust that carries with dehydrator flue gas of coal dust mix, the coal dust of sack cleaner is delivered to powder conveying device B by powder conveying device A, the coal dust of powder collector also delivers to powder conveying device B, and the coal dust in powder conveying device B gives powder conveying device C, and coal dust is delivered to powder-storage bin by powder conveying device C; Coal dust in powder conveying device B and the coal dust in powder conveying device C can also be delivered in powder-storage bin separately through powder conveying device.
Compared with prior art, the present invention has following beneficial effect:
(1) ensure that the negative pressure of whole system, while eliminating the dust pollution in pulverizing process, coal dust moisture content, granularity that sack cleaner is collected are more uniform, largely reduce the probability of spontaneous combustion of pulverized coal and blast, improve the safety of system;
(2) balance wind pipe sets up on sack cleaner, and original cloth bag powder collector just can omit, and gathering dust of balance wind pipe does not need another oil (gas) filling device, decreases cost and floor space, and system complexity reduces; The wind powder mixture of balance wind pipe gather dust after through chimney discharged to air, the height of smoke evacuation raises significantly, and surrounding working environment has had obvious improvement;
(3) balance wind pipe sets up on sack cleaner, is originally used for carrying the device of cloth bag powder collector coal dust to omit, decreases the equipment of system, reduce the complexity of system;
(4) on balance wind pipe, add adjustment valve, system negative pressure as required can carry out the size of adjustment air quantity.
Accompanying drawing explanation
Executing, to non-limiting, the detailed description that example is made with reference to the following drawings by reading, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 is the structural representation of coal dust preparation system in the present invention;
Fig. 2 is the schematic diagram of coal-grinding working procedure systems in prior art;
Fig. 3 is the schematic diagram of integration coal dust preparation system in prior art.
In figure: 1-raw coal screening bucket; 2-raw coal conveyer device; 3-heat power supply device; 4-drying unit; 5-elevator; 6-milling device; 7-powder collector; 8-aerator; 9-balance wind pipe; 10-balances wind and regulates valve; 11-sack cleaner; 12-air-introduced machine; 13-chimney; 14-powder conveying device A; 15-powder conveying device B; 16-powder conveying device C; 17-powder-storage bin; 18-cloth bag powder collector.
Detailed description of the invention
The present invention is described in detail specifically to execute example below in conjunction with accompanying drawing 1. It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement. These broadly fall into protection scope of the present invention.
A kind of coal dust preparation system, bucket 1 is sieved including raw coal, raw coal conveyer device 2, heat power supply device 3, drying unit 4, elevator 5, milling device 6, powder collector 7 and aerator 8, sack cleaner 11, air-introduced machine 12, powder conveying device A14, powder conveying device B15, powder conveying device C16 and powder-storage bin 17, coal is sent into drying unit 4 by raw coal conveyer device by raw coal screening bucket 1, the smoke outlet of described heat power supply device 3 is connected with the entrance point of the flue gas of drying unit 4, the dry material outlet end of described drying unit 4 is closed with elevator 5 feed end and is connected, elevator 5 discharge end is closed with the charging aperture of milling device 6 and is connected, the wind powder mixture port of export of milling device 6 is connected with the wind powder mixture entrance point of powder collector 7, the wind powder mixture port of export of powder collector 7 is connected with the entrance point of aerator 8, the port of export of aerator 8 is connected with the wind powder mixture entrance point of milling device 6, milling device 6, powder collector 7, the grinding blood circulation of closing is formed between aerator 8. the smoke outlet of drying unit 4 is connected with the gas approach end of sack cleaner 11, the smoke outlet of sack cleaner 11 is connected with air-introduced machine 12, and the outlet of air-introduced machine 12 is connected with chimney 13, the coal dust of sack cleaner 11 is delivered to powder conveying device B15 by powder conveying device A14, the coal dust of powder collector 7 also delivers to powder conveying device B15, coal dust in powder conveying device B15 gives powder conveying device C16, coal dust is delivered to powder-storage bin 17 by powder conveying device C16, or the coal dust in powder conveying device B15 and the coal dust in powder conveying device C16 can also be delivered in powder-storage bin 17 separately through powder conveying device.
The maximum feature of patent of the present invention is: also include balance wind pipe 9, and the port of export of aerator 8 is connected with the gas approach end of sack cleaner 11 further through balance wind pipe 9. Described balance wind pipe 9 is provided with balance wind and regulates valve 10.
Sack cleaner outlet is connected with air-introduced machine, by the effect of air-introduced machine, it is achieved following two effects:
(1) heat smoke in drying unit is evacuated to sack cleaner, heat smoke is discharged, and coal dust is stayed in sack cleaner;
(2) milling device is evacuated in sack cleaner through balance wind pipe, gas is discharged, and coal dust is stayed in sack cleaner.
Accompanying drawing 1 system and accompanying drawing 2 systematic comparison, in pulverized coal preparation and coal dust stocking system, adopt erection balance wind pipe to sack cleaner to have very big superiority:
(1) namely ensure that whole system place of leaking out is completely in negative pressure state, sack cleaner is collected simultaneously coal dust moisture content, granularity are more uniform, largely reduce the probability of spontaneous combustion and blast, improve the safety of system;
(2) equipment is simple, and floor space is few, and balance wind pipe, without bridge joint to cloth bag powder collector, is saved cloth bag powder collector, decreased cost and floor space, and system complexity reduces; The wind powder mixture of balance wind pipe gather dust after through chimney discharged to air, the height of smoke evacuation raises significantly, and surrounding working environment has had obvious improvement;
(3) originally it is used for carrying the device of cloth bag powder collector coal dust to omit, decreases the equipment of system, reduce the complexity of system;
(4) on balance wind pipe, add balance wind regulate valve, system negative pressure as required can carry out the size of adjustment air quantity.
The method that coal dust preparation system described in utilizing carries out pulverized coal preparation is as follows:
Raw coal sends into drying unit 4 through raw coal screening bucket 1 and raw coal conveyer device 2, and raw coal is dried by the heat smoke that heat power supply device 3 is delivered to, and the flue gas after drying is drawn onto sack cleaner 11 by air-introduced machine 13 and gathers dust, then through chimney 13 discharged to air, flour mill 6 delivered to by the boosted machine 5 of raw coal dried, and the power cycle provided by aerator 8 is ground, and the qualified fine coal of major part is collected in cyclone separator 7, and underproof fine coal is fallen and carried out regrinding in flour mill 6, until qualified, fine coal qualified on a small quantity enters aerator 8 entrance, the balance wind pipe 9 of aerator 8 exit erection, wind powder mixture is delivered to sack cleaner 11 through this airduct and is gathered dust, trap the coal dust that carries with dehydrator flue gas of coal dust mix, the coal dust of sack cleaner 11 is delivered to powder conveying device B15 by powder conveying device A14, the coal dust of powder collector 7 also delivers to powder conveying device B15, coal dust in powder conveying device B15 gives powder conveying device C16, coal dust is delivered to powder-storage bin 17 by powder conveying device C16, or the coal dust in powder conveying device B15 and the coal dust in powder conveying device C16 can also be delivered in powder-storage bin 17 separately through powder conveying device.
Above specific embodiments of the invention are described. It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (8)
1. a coal dust preparation system, including heat power supply device (3), drying unit (4), milling device (6), powder collector (7) and aerator (8), sack cleaner (11) and air-introduced machine (12), heat power supply device (3) provides heat energy for drying unit (4), and the smoke outlet of drying unit (4) is connected with the gas approach end of sack cleaner (11), the smoke outlet of sack cleaner (11) is connected with air-introduced machine (12), milling device (6) sent into by the dry raw material of drying unit (4), the wind powder mixture port of export of milling device (6) is connected with the wind powder mixture entrance point of powder collector (7), the wind powder mixture port of export of powder collector (7) is connected with the entrance point of aerator (8), the port of export of aerator (8) is connected with the wind powder mixture entrance point of milling device (6), milling device (6), powder collector (7), the grinding blood circulation of closing is formed between aerator (8), it is characterized in that, also include balance wind pipe (9), the port of export of aerator (8) is connected further through the gas approach end of balance wind pipe (9) with sack cleaner (11).
2. a kind of coal dust preparation system according to claim 1, it is characterised in that described balance wind pipe (9) is provided with balance wind and regulates valve (10).
3. a kind of coal dust preparation system according to claim 1, it is characterised in that the outlet of described air-introduced machine (12) is connected with chimney (13).
4. a kind of coal dust preparation system according to claim 1, it is characterised in that the smoke outlet of described heat power supply device (3) is connected with the entrance point of the flue gas of drying unit (4).
5. a kind of coal dust preparation system according to claim 1, it is characterised in that also include raw coal screening bucket
With raw coal conveyer device (2), coal is sent into drying unit (4) by raw coal conveyer device (2) by raw coal screening bucket (1).
6. a kind of coal dust preparation system according to claim 1, it is characterized in that, also including elevator (5), the dry material outlet end of described drying unit (4) is closed with elevator (5) feed end and is connected, and elevator (5) discharge end is closed with the charging aperture of milling device (6) and is connected.
7. a kind of coal dust preparation system according to claim 1, it is characterized in that, also include powder conveying device A(14), powder conveying device B(15), powder conveying device C(16) and powder-storage bin (17), powder conveying device A(14) coal dust of sack cleaner (11) is delivered to powder conveying device B(15), the coal dust of powder collector (7) also delivers to powder conveying device B(15), powder conveying device B(15) in coal dust give powder conveying device C(16), powder conveying device C(16) coal dust delivered to powder-storage bin (17), or powder conveying device B(15) in coal dust and powder conveying device C(16) in coal dust can also deliver in powder-storage bin (17) separately through powder conveying device.
8. utilize the method that a kind of coal dust preparation system described in claim 1 to 7 carries out pulverized coal preparation, it is characterized in that, raw coal sends into dehydrator through raw coal screening bucket and raw coal conveyer device, raw coal is dried by the flue gas that air stove is delivered to, flue gas after drying is drawn onto sack cleaner by air-introduced machine and gathers dust, then through chimney discharged to air, flour mill delivered to by the boosted machine of raw coal dried, and the power cycle provided by aerator is ground, and the qualified fine coal of major part is collected in cyclone separator, and underproof fine coal is fallen and carried out regrinding in flour mill, until qualified, fine coal qualified on a small quantity enters blower inlet, the balance wind pipe of blower export place erection, wind powder mixture is delivered to sack cleaner through this airduct and is gathered dust, trap the coal dust that carries with dehydrator flue gas of coal dust mix, the coal dust of sack cleaner is delivered to powder conveying device B by powder conveying device A, the coal dust of powder collector also delivers to powder conveying device B, coal dust in powder conveying device B gives powder conveying device C, coal dust is delivered to powder-storage bin by powder conveying device C, or the coal dust in powder conveying device B and the coal dust in powder conveying device C can also be delivered in powder-storage bin separately through powder conveying device.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238185A (en) * | 2016-08-30 | 2016-12-21 | 王政 | A kind of raw coal disintegrating machine |
| CN106669940A (en) * | 2017-01-11 | 2017-05-17 | 安徽特维工程科技有限公司 | Coal powder preparation process method based on vertical mill |
| CN110404650A (en) * | 2019-07-04 | 2019-11-05 | 国能绿色能源股份有限公司 | A kind of safe and efficient coal mill system and its method for preparing lignite |
| CN111020084A (en) * | 2019-12-24 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Recovery processing method for blast furnace injection coking |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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| CN111020084A (en) * | 2019-12-24 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Recovery processing method for blast furnace injection coking |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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Application publication date: 20160601 |