CN111974535A - Double-fan grinding system - Google Patents
Double-fan grinding system Download PDFInfo
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- CN111974535A CN111974535A CN202010765340.9A CN202010765340A CN111974535A CN 111974535 A CN111974535 A CN 111974535A CN 202010765340 A CN202010765340 A CN 202010765340A CN 111974535 A CN111974535 A CN 111974535A
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- dust remover
- double
- pipeline
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- 238000000227 grinding Methods 0.000 title claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 69
- 239000002912 waste gas Substances 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 19
- 239000003546 flue gas Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 18
- 239000000843 powder Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a double-fan grinding system which comprises a hot blast stove, a grinding machine, a dust removal device and a waste gas discharge pipeline, wherein the dust removal device comprises a first dust remover, a second dust remover, a first fan and a second fan, a smoke outlet of the hot blast stove is connected with a smoke inlet of the grinding machine, a discharge port of the grinding machine is respectively connected with a feeding port of the first dust remover and a feeding port of the second dust remover, a waste gas outlet of the first dust remover is connected with a gas inlet of the first fan, a gas outlet of the first fan is connected with the waste gas discharge pipeline, a waste gas outlet of the second dust remover is connected with a gas inlet of the second fan, a gas outlet of the second fan is connected with one end of a return pipeline, and the other end of the return pipeline is connected with the. The circulating air pipeline of the invention does not need a circulating air valve and a waste gas discharge pipeline, and the circulating air quantity directly passes through the frequency condition of the circulating fan, thereby reducing the energy consumption increased by the circulating air valve and the inlet valve of the chimney.
Description
Technical Field
The invention belongs to the technical field of material grinding, and particularly relates to a double-fan grinding system.
Background
The grinding system is widely used in the industries of building materials, metallurgy and the like, and is a production process system for grinding and drying materials. The system is widely used for preparing slag micro powder (steel slag micro powder, limestone micro powder, coal powder, cement micro powder and micro powder of other materials). At present, grinding systems mainly comprise two types, namely a traditional single-fan system and a traditional double-fan system.
As shown in fig. 1, when the conventional single-fan system works, the hot blast stove provides heat, materials are ground in the mill and dried by hot flue gas, the dried finished products are collected in the dust remover 1, part of the air outlet of the fan 1 is discharged through a chimney, and part of the air outlet enters the mill for recycling through a flue gas backflow pipeline. Part of the heat of the drying material comes from the hot blast stove, and part of the heat comes from the self-circulation flue gas. If no drying is needed, the hot blast stove will be converted into an air suction opening.
The traditional single-fan system drives circulating air to reach an inlet of a mill by using the pressure difference between an outlet of a fan and the inlet of the mill, and a circulating air regulating valve is arranged on a circulating air pipeline to regulate the flow of the circulating air according to different working conditions. Thus, the circulating air regulating valve consumes part of the fan pressure when the system is in operation, and thus part of the energy consumed by the main exhaust fan. On the other hand, in order to realize a larger flue gas circulation rate and reduce heat consumption, a chimney inlet valve (or a throttling device) is used for enabling a certain positive pressure to be formed at a fan outlet, and a sufficient pressure difference is formed between the positive pressure and a mill inlet, so that the flue gas is driven to self-circulate to the mill inlet. However, the chimney inlet valve (or throttle device) also consumes a portion of the main blower pressure and thus a portion of the main blower energy.
As shown in fig. 2, in the conventional dual-fan system, a dust remover 1 is arranged at the downstream of a mill, a fan 1 is arranged at the outlet of the dust remover 1, the outlet of the fan 1 is divided into two paths, and one path is discharged through a chimney through the dust remover 2 and the fan 2; one path is sent to the inlet of the mill for recycling through a circulating air pipeline. Compared with the traditional single-fan system, the cyclone dust collector with low use cost can treat part of air quantity, thereby reducing the area of the bag-type dust collector and reducing the investment. However, the air at the outlet of the mill in the traditional double-fan system is composed of two parts of circulating air and external air. The circulating air, that is, the part of the air returning to the inlet of the mill through the fan 1, needs to overcome the resistance of the dust remover 1 through the fan 1; the external exhaust, that is, the part of the air exhausted by the fan 2, needs to overcome the resistance of the dust remover 1 through the fan 1, and then overcome the resistance of the dust remover 2 through the fan 2. Under the condition of the same air quantity, the larger the resistance to be overcome, the larger the power consumed by the fan, so that the total power consumption of the traditional double-fan system is larger.
In addition, in the traditional double-fan system, the materials can be segregated in the cyclone dust collector (dust collector 1), the partial materials which are discharged from the exhaust port of the cyclone dust collector (dust collector 1) along with the flue gas and collected by the bag-type dust collector (dust collector 2) can be very fine, the specific surface area of the materials can be improved relative to the outlet of the mill, the materials which are directly discharged from the discharge port of the cyclone dust collector (dust collector 1) are relatively thick, two materials with different specific surfaces can be generated, and the energy is wasted.
Disclosure of Invention
The invention aims to provide a double-fan grinding system.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a double fan grinding system, includes hot-blast furnace, mill, dust collector, exhaust emission pipeline, dust collector includes first dust remover, second dust remover, first fan, second fan, hot-blast furnace exhanst gas outlet and mill flue gas entry linkage, the mill discharge gate is connected with first dust remover pan feeding mouth, second dust remover pan feeding mouth respectively, first dust remover exhaust outlet is connected with first fan air inlet, first fan gas outlet and exhaust emission pipeline connection, second dust remover exhaust outlet is connected with second fan air inlet, second fan gas outlet is connected with return line's one end, return line's the other end and mill flue gas entry linkage.
Preferably, the first fan and the second fan are both adjusted by frequency conversion.
Preferably, the working frequency difference between the first fan and the second fan is 5Hz-10Hz in the cold state, and the frequency difference between the first fan and the second fan is 10-15Hz in the hot state.
Preferably, the return pipeline is provided with an air charging pipeline and an air charging pipeline adjusting valve, and the air charging pipeline adjusting valve are arranged at one end close to the mill.
Preferably, the discharge port of the mill is connected with a one-to-two pipeline.
Preferably, the mill discharge outlet pipeline is a cylinder, and two ports are arranged on the side surface of the cylinder.
Preferably, a flow guide plate is arranged at the bottom of the mill discharge outlet pipeline.
Compared with the prior art, the invention has the following remarkable advantages:
the circulating air pipeline of the invention does not need a circulating air valve and a waste gas discharge pipeline, and the circulating air quantity directly passes through the frequency condition of the circulating fan, thereby reducing the energy consumption increased by the circulating air valve and a chimney inlet valve (or a throttling device);
compared with the traditional single-fan system, the invention saves energy by 10-15%;
the invention only needs to overcome the resistance of the first dust remover, and saves the fan energy consumption consumed by the traditional double-fan system when overcoming the resistance generated by the first dust remover under the condition of the same air volume;
the invention has low requirement on the fan, does not need to carry out special wear-resistant treatment on the fan impeller and the like, has small wear, long service life and low maintenance cost;
the specific surface areas of the materials collected from the two dust collectors are completely the same, so that the waste of production energy caused by large deviation of the specific surface areas of the materials collected by the two dust collectors of the traditional double-fan system is avoided.
The present invention is described in further detail below with reference to the attached drawings.
Drawings
Fig. 1 is a schematic diagram of a conventional single-fan pulverizing system.
Fig. 2 is a schematic diagram of a conventional double-fan grinding system.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4 is a schematic structural view of a double-fan grinding system with an air charging pipeline.
FIG. 5 is a schematic view of a conventional mill outlet.
FIG. 6 is a schematic view of the outlet of the mill of the present invention.
Fig. 7 is a schematic view of a baffle.
Detailed Description
As shown in fig. 3, a double-fan grinding system comprises a hot blast stove, a mill 2, a dust removal device and a waste gas discharge pipeline 3, wherein the dust removal device comprises a first dust remover 4, a second dust remover 5, a first fan 6 and a second fan 7, a flue gas outlet of the hot blast stove is connected with a flue gas inlet of the mill 2, a discharge port of the mill 2 is respectively connected with a feeding port of the first dust remover 4 and a feeding port of the second dust remover 5, a waste gas outlet of the first dust remover 4 is connected with a gas inlet of the first fan 6, a gas outlet of the first fan 6 is connected with the waste gas discharge pipeline 3, a waste gas outlet of the second dust remover 5 is connected with a gas inlet of the second fan 7, a gas outlet of the second fan 7 is connected with a return pipeline 8, and the return pipeline 8.
In a further embodiment, in order to save electricity consumption and heat consumption, the flue gas self-circulation rate of a larger proportion is 65-80%, and the first fan 6 and the second fan 7 are both adjusted by frequency conversion. During frequency conversion adjustment, the air quantity and the rotating speed form a primary square relation, the air pressure and the rotating speed form a quadratic relation, and the output change of the full pressure of the fan is large.
After one fan is started, the other fan forms an opposite phase dragging load, the working frequency difference of the two fans is required to be smaller, otherwise, the fan with the smaller frequency has an overcurrent jump stop fault. In a cold state, the working frequency difference between the first fan 6 and the second fan 7 is 5Hz-10Hz due to lower smoke temperature and higher density, and in a hot state, the frequency difference between the first fan 6 and the second fan 7 is 10 Hz-15 Hz due to the rise of smoke temperature and the reduction of gas density.
In the invention, all the air quantity at the outlet of the second fan 7 enters the inlet of the mill 2, and the air quantity of the part realizes complete self circulation, so that the two fans of the invention have different loaded air quantity and air pressure, and adopt two fans with different performance curves.
In a further embodiment, as shown in fig. 4, after the second fan 7 is operated, the zero point on the return line is shifted, the return line is provided with an air mixing duct for mixing cold air and a cooling duct adjusting valve, and the air mixing duct and the cooling duct adjusting valve are arranged close to the inlet of the mill. And under specific conditions, opening a regulating valve of the air charging pipe, and sucking the atmosphere through the air charging pipeline to cool the system process.
In a further embodiment, as shown in fig. 6, the discharge port of the mill 2 is connected to a one-to-two pipeline, so that the mill 2 has two outlets which are respectively connected to the inlets of the first dust remover 4 and the second dust remover 5 in a one-to-one correspondence manner.
Preferably, the discharge port of the mill 2 is a cylinder, two ports are arranged on the side surface of the discharge port, and the two ports are respectively connected with the first dust remover 4 and the second dust remover 5, so that the distance between the mill and the dust removers is greatly shortened, and the occupied space is saved.
In a further embodiment, as shown in fig. 7, a flow guide plate is arranged at the bottom of the cylinder to change the rotating flow field of the outlet of the powder concentrator into a vertical flow field, which is beneficial to the air flow distribution of the two outlets.
The mill 2 is a vertical mill.
According to the invention, the two dust collectors are connected in parallel, materials are collected by the two dust collectors at one time, and the particle size distributions of the materials collected by the two dust collectors are very close, so that the specific surface areas of the materials collected by the two dust collectors are very close or are considered to be almost the same.
The working process of the invention is as follows:
the hot blast stove provides heat, the material is ground in mill 2 and is dried by hot flue gas simultaneously, mill 2 has two routes discharge gate, and the material after being dried by hot flue gas is discharged through first dust remover 4, first fan 6 through exhaust emission pipeline 3 all the way from the mill discharge gate, and the export of mill all the way is sent to mill 2 entry recycling through second dust remover 5, second fan 7 rethread return line 8. Part of the heat of the drying material comes from the hot blast stove, and part of the heat comes from the self-circulation flue gas. If drying is not needed, the hot blast stove is changed into an air suction opening.
Example 1
Taking 150 ten thousand tons of slag micropowder lines as an example, 800000m3/h is uniformly selected as the air quantity required by the mill (at the outlet of the mill), the flue gas circulation rate is 70%, and as the resistance of the dust remover is related to the selection of the filtering air speed of the dust remover and the selection of the filter bag, 1500Pa is uniformly selected as the resistance of the dust remover for comparison, and if the resistance is required to be reduced, the dust removing equipment can be uniformly increased.
Compared with the traditional single-fan system, the invention saves the fan power by 238KW and saves energy by 14.58 percent; compared with the traditional double-fan system, the power of the fan is saved by 117KW, and the energy is saved by 7.76%.
1) Power consumption of single fan system
Atmospheric pressure: 101325Pa
Mill inlet pressure P1: -500Pa
Mill resistance: 3500Pa
Dust remover 1 and the inlet and outlet duct resistances: 1500Pa
Fan 1 outlet pressure P4: 500Pa, inlet pressure P3 of fan 1: 5500Pa
Stack inlet pressure P5: -200P
The total pressure of the fan 1 for doing work is 6000Pa, and the air volume of the fan 1 for doing work is as follows: 812523m3/h (800000 × (101325 + 4000)/(101325 + 5500) ═ 812523), the efficiency of the operating point of the fan 1 is calculated according to 0.83, and the consumed power is 1632 KW.
2) Power consumption of conventional dual fan system
For the traditional double-fan system, the flue gas circulation rate is also realized by 70 percent,
mill inlet pressure P1: -500Pa
Mill resistance: 3500Pa
Cloth bag 1 and inlet and outlet pipeline resistance: 1500Pa
Cloth bag 2 and inlet and outlet pipeline resistance: 1500Pa
Outlet pressure P4 of fan 1, -450Pa (considering circulating air duct resistance 50Pa), inlet pressure P3 of fan 1: 5500Pa
The outlet pressure P5 of the fan 2 is-200 Pa, the inlet pressure P6 of the fan 2 is-1950 Pa (-450-
Full pressure of fan 1 doing work: 5050pa, 812523m3/h (800000 (101325 + 4000)/(101325 + 5500) ═ 812523) of the air flow rate 812523m3/h of the fan 1 doing work, the efficiency of the working point of the fan is calculated according to 0.83, and the consumed power is 1373 KW.
Full pressure of fan 2 acting: 1750pa, the air quantity 235049m3/h (800000 0.3 (101325 + 4000)/(101325 + 1950) ═ 235049) of the fan 2 doing work, the fan operating point efficiency is calculated according to 0.83, and the consumed power is 138 KW.
The total power consumption of the fan is 1511KW, which saves 121KW of fan power and 7.40% of energy compared with the traditional single fan system
3) The power consumption of the invention is as follows
For the present invention, a flue gas circulation rate of 70% is also achieved,
mill inlet pressure P1: -500Pa
Mill resistance: 3500Pa
Cloth bag 1 and inlet and outlet pipeline resistance: 1500Pa
Second fan outlet pressure P4: -450Pa (considering circulating air duct resistance 50Pa), second fan inlet pressure P3: 5500Pa
The outlet pressure P5 of the first fan is-200 Pa, and the inlet pressure P6 of the first fan is-5500 Pa
Full pressure of second fan acting: 5050pa, the air quantity 568766m3/h (800000 × 0.7 (101325 + 4000)/(101325 + 5500) ═ 568766) of the second fan doing work, the fan operating point efficiency is calculated according to 0.83, and the consumed power is 961 KW.
Full pressure of first fan acting: 5300pa, the air volume 243757m3/h (800000 0.3 (101325 + 4000)/(101325 + 5500) ═ 243757) for the first fan to do work, the fan operating point efficiency is calculated according to 0.83, and the consumed power is 432 KW.
The total power consumption of the fan is 1394KW, and compared with the traditional single fan system, the fan power is saved by 238KW, and the energy is saved by 14.58%; compared with the traditional double-fan system, the power of the fan is saved by 117KW, and the energy is saved by 7.76%.
Comparing power consumption of fans of different systems
Claims (8)
1. A double-fan grinding system is characterized by comprising a hot blast stove, a grinding machine (2), a dust removal device and a waste gas discharge pipeline (3), the dust removing device comprises a first dust remover (4), a second dust remover (5), a first fan (6) and a second fan (7), the flue gas outlet of the hot blast stove is connected with the flue gas inlet of the mill (2), the discharge hole of the mill (2) is respectively connected with the feed inlet of the first dust remover (4) and the feed inlet of the second dust remover (5), the waste gas outlet of the first dust remover (4) is connected with the air inlet of a first fan (6), the air outlet of the first fan (6) is connected with the waste gas discharge pipeline (3), the waste gas outlet of the second dust remover (5) is connected with the air inlet of a second fan (7), the air outlet of the second fan (7) is connected with one end of a return pipeline (8), the other end of the return pipeline (8) is connected with a smoke inlet of the mill (2).
2. The double-fan grinding system according to claim 1, wherein the first fan (6) and the second fan (7) are both frequency-variable regulated.
3. The double-fan grinding system according to claim 1, wherein the frequency difference between the first fan (6) and the second fan (7) is 5Hz-10Hz in the cold state, and the frequency difference between the first fan (6) and the second fan (7) is 10-15Hz in the hot state.
4. The double-fan grinding system according to claim 1, wherein the return line is provided with an air charging pipe and an air charging pipe adjusting valve, and the air charging pipe adjusting valve are arranged at one end close to the mill (2).
5. The double-fan grinding system according to claim 1, wherein a discharge port of the mill (2) is connected with a one-to-two pipeline.
6. The double-fan grinding system according to claim 1, wherein the discharge pipe of the mill (2) is a cylinder, and two ports are arranged on the side surface of the cylinder.
7. The double-fan grinding system according to claim 6, wherein a flow guide plate is arranged at the bottom of a discharge hole pipeline of the grinding machine (2).
8. A double fan mill grinding system according to claim 1, characterized in that the mill (2) is a vertical mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765340.9A CN111974535A (en) | 2020-08-03 | 2020-08-03 | Double-fan grinding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765340.9A CN111974535A (en) | 2020-08-03 | 2020-08-03 | Double-fan grinding system |
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| Publication Number | Publication Date |
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| CN111974535A true CN111974535A (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010765340.9A Pending CN111974535A (en) | 2020-08-03 | 2020-08-03 | Double-fan grinding system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118371311A (en) * | 2024-06-25 | 2024-07-23 | 福建拓天生物科技有限公司 | Edible fungus slicing and powdering equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839032A (en) * | 2009-11-19 | 2012-12-26 | 李功民 | Dry separation and drying combined device |
| CN204638281U (en) * | 2015-03-13 | 2015-09-16 | 浙江拓翔建材有限公司 | A kind of slag milling device |
| CN105233953A (en) * | 2015-11-03 | 2016-01-13 | 江苏省冶金设计院有限公司 | Device and method for multiple low temperature drying chromite grinding and hierarchical powder collection |
| WO2016201652A1 (en) * | 2015-06-17 | 2016-12-22 | 许亮芳 | Cement dust removal system |
| CN212396995U (en) * | 2020-08-03 | 2021-01-26 | 大峘集团有限公司 | Double-fan grinding system |
-
2020
- 2020-08-03 CN CN202010765340.9A patent/CN111974535A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839032A (en) * | 2009-11-19 | 2012-12-26 | 李功民 | Dry separation and drying combined device |
| CN204638281U (en) * | 2015-03-13 | 2015-09-16 | 浙江拓翔建材有限公司 | A kind of slag milling device |
| WO2016201652A1 (en) * | 2015-06-17 | 2016-12-22 | 许亮芳 | Cement dust removal system |
| CN105233953A (en) * | 2015-11-03 | 2016-01-13 | 江苏省冶金设计院有限公司 | Device and method for multiple low temperature drying chromite grinding and hierarchical powder collection |
| CN212396995U (en) * | 2020-08-03 | 2021-01-26 | 大峘集团有限公司 | Double-fan grinding system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118371311A (en) * | 2024-06-25 | 2024-07-23 | 福建拓天生物科技有限公司 | Edible fungus slicing and powdering equipment |
| CN118371311B (en) * | 2024-06-25 | 2024-09-17 | 福建拓天生物科技有限公司 | Edible fungus slicing and powdering equipment |
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