CN112283735A - A centralized pulverizing system for high-moisture lignite coal - Google Patents
A centralized pulverizing system for high-moisture lignite coal Download PDFInfo
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- CN112283735A CN112283735A CN202011304076.5A CN202011304076A CN112283735A CN 112283735 A CN112283735 A CN 112283735A CN 202011304076 A CN202011304076 A CN 202011304076A CN 112283735 A CN112283735 A CN 112283735A
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- 239000003245 coal Substances 0.000 title claims abstract description 132
- 239000003077 lignite Substances 0.000 title claims abstract description 25
- 238000010298 pulverizing process Methods 0.000 title claims description 22
- 239000000843 powder Substances 0.000 claims abstract description 134
- 239000000428 dust Substances 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 11
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims description 11
- 239000002023 wood Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Classifications
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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
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a centralized powder-making system for high-moisture lignite coal, wherein an outlet of a raw coal bin is communicated with an inlet of a medium-speed roller type coal mill, an outlet of the medium-speed roller type coal mill is communicated with an inlet of a separation system, an exhaust gas outlet of the separation system is communicated with an inlet of a bag-type dust remover, a powder outlet of the separation system is communicated with an inlet of a centralized powder bin, an outlet at the top of a fine powder separator is communicated with an inlet of the bag-type dust remover, an air outlet of the bag-type dust remover is divided into two paths after passing through a powder exhaust fan, one path of the two paths is communicated with a chimney through a waste heat recovery device, the other path of the two paths is communicated with an inlet of the medium-speed roller type coal mill through an exhaust gas recirculation; the powder outlet of the bag-type dust collector is communicated with the concentrated powder bin, and the inlet of each coal powder feeder is communicated with the outlet of the concentrated powder bin.
Description
Technical Field
The invention relates to a pulverizing system, in particular to a centralized pulverizing system for high-moisture lignite coal.
Background
At present, a large power station boiler usually adopts a medium-speed roller coal mill direct-fired pulverizing system or a fan coal mill to grind high-moisture lignite. Because the moisture content of the lignite is high, the drying output of the direct-fired pulverizing system is easy to be insufficient, in addition, moisture generated by grinding the lignite enters a hearth, the smoke gas amount, the smoke exhaust temperature and the smoke exhaust heat loss are higher than those of other coal types, and the operation economy of a boiler unit is influenced. The biggest defect of the fan mill for grinding high-moisture lignite is that a grinding part is fast in abrasion, the overhaul period is short, the workload of impeller replacement is large, when the fan mill direct-blowing type coal pulverizing system participates in peak shaving, a coal mill runs under low and medium output, so that the power consumption of pulverized coal is high, cold air needs to be doped as a temperature adjusting medium for controlling the outlet temperature of the coal mill, the oxygen content of the pulverized coal pulverizing system is increased while the running economy of a boiler is reduced, the deflagration risk of the pulverized coal pulverizing system is increased, and the safety of the pulverized coal pulverizing system is reduced.
In addition, the large power station boiler using the traditional medium-speed roller coal mill has the following problems when high-moisture lignite is burned: 1) for a direct-blowing pulverizing system of a medium-speed roller type coal mill, the air speed and the powder quantity distribution in a powder pipe are often uneven, especially the powder quantity distribution is often uneven, the powder quantity deviation can reach +/-40 percent when the powder quantity deviation is large, the furnace is burnt partially or the local temperature is over-heated, and the powder quantity distribution at the outlet of most coal mills in power plants has no adjustable means. 2) For a direct-fired pulverizing system of a medium-speed roller coal mill, because the operating characteristics of each mill are different, the fineness of pulverized coal at the outlet of each burner is different, and the direct-fired pulverizing system is not favorable for combustion organization. The fan mill direct-fired pulverizing system has the following problems when being used for milling high-moisture lignite: 1) a large power station boiler burning lignite with moisture less than 40% generally adopts a fan coal mill direct-blowing pulverizing system, but the impeller of the fan coal mill is seriously worn, the service life is only 2000-4000 hours, and the overhaul workload is large. 2) The pressure head of the fan coal mill is limited, the flow rate of the outlet of the burner is limited, and the combustion power field in the furnace is not easy to control. 3) The fan coal mill can only be arranged around the boiler, which causes difficulty in arranging the coal bunker and the coal feeder. 4) The high-temperature furnace smoke drying pipe of the fan coal mill has a complex structure, a stainless steel inner bushing is expensive and easy to damage, and a smoke exhaust port is easy to slag.
In order to solve the problems, a fuel supply system which is more excellent when being suitable for grinding high-moisture lignite by a large power station boiler is searched and found so as to improve the operation safety and the economical efficiency. For high-moisture lignite, the concept of concentrated pulverizing is applied to a pre-drying and medium-speed coal mill system, so that the water content in flue gas can be further reduced, the volume of a hearth is reduced, the furnace efficiency is improved, and the arrangement is more flexible.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a centralized powder making system for high-moisture lignite coal, which has the advantages of higher safety, better economy, long service life, simpler structure, more flexible arrangement and more convenient powder distribution.
In order to achieve the aim, the centralized powder making system for the high-moisture lignite coal comprises a raw coal bin, a medium-speed roller type coal mill, a separation system, a bag-type dust remover, a centralized powder bin, a fine powder separator, a powder discharge fan, a waste heat recovery device, a chimney, an exhaust gas recirculation pipe, a temperature-adjusting cold air pipe, a drying hot air pipe and a plurality of coal powder feeders;
the outlet of the raw coal bin is communicated with the inlet of a medium-speed roller-type coal mill, the outlet of the medium-speed roller-type coal mill is communicated with the inlet of a separation system, the exhaust gas outlet of the separation system is communicated with the inlet of a bag-type dust remover, the powder outlet of the separation system is communicated with the inlet of a concentrated powder bin, the outlet of the top of a fine powder separator is communicated with the inlet of the bag-type dust remover, the air outlet of the bag-type dust remover is divided into two paths after passing through a powder exhaust fan, one path is communicated with a chimney through a waste heat recovery device, the other path is communicated with the inlet of the medium-speed roller-type coal mill through an exhaust gas recirculation pipe, and a temperature; the powder outlet of the bag-type dust collector is communicated with the concentrated powder bin, and the inlet of each coal powder feeder is communicated with the outlet of the concentrated powder bin.
The separation system comprises a coarse powder separator and a fine powder separator, wherein an outlet of the medium-speed roller type coal mill is communicated with an inlet of the coarse powder separator, a fine powder outlet at the top of the coarse powder separator is communicated with an inlet of the fine powder separator, an outlet at the bottom of the fine powder separator is communicated with an inlet of the concentrated powder bin, and an outlet at the top of the fine powder separator is communicated with an inlet of the bag-type dust remover.
An outlet at the bottom of the coarse powder separator is communicated with a medium-speed roller coal mill through a powder return pipe.
The outlet of the raw coal bin is communicated with the inlet of the medium-speed roller coal mill through a belt coal feeder and a drier.
The fine powder separator is a primary-secondary fine powder separator.
The outlet at the bottom of the fine powder separator is communicated with the inlet of the concentrated powder bin through the air lock and the sawdust separator.
The invention has the following beneficial effects:
when the concentrated powder making system for the high-moisture lignite coal is specifically operated, raw coal firstly enters the dryer for pre-drying, the moisture of the raw coal is reduced to be within 15% from 30% -40%, then the raw coal enters the medium-speed roller type coal mill for grinding, so that the high-moisture lignite coal is treated, the concentrated powder making system is high in safety and economy and long in service life, pulverized coal output by the medium-speed roller type coal mill enters the separation system for separation, the separated pulverized coal enters the concentrated powder bin, a plurality of pulverized coal feeders are arranged below the concentrated powder bin, the pulverized coal is fed into the concentrated phase conveying system through the pulverized coal feeders, the pulverized coal is conveyed to the front of the furnace remotely by virtue of compressed air and is carried into a hearth for combustion by hot air, the concentrated powder making system is simple in structure, flexible in arrangement and convenient in powder quantity distribution, and the invention is used for replacing the conventional straight-blowing type powder making system of the roller type coal mill and the fan type coal mill to grind the high-moisture lignite coal The water content of the coal as fired can be effectively reduced, which is equivalent to improving the heat value of the coal as fired, and simultaneously, the exhaust gas temperature, the water content in the exhaust gas, the exhaust gas quantity and the exhaust gas heat loss can be effectively reduced, thereby improving the boiler efficiency and reducing the coal consumption. In addition, under the same load, after the concentrated powder making is adopted, the power consumption of a coal mill, the power consumption of a primary fan and the power consumption of a draught fan are reduced, and the expected indexes are as follows: the heat efficiency of the boiler is improved by 0.92-1 percentage point, the economical efficiency of the unit is improved by comprehensively pumping steam for drying, the coal consumption is reduced by 3.6-4g/kWh, the uniformity of pulverized coal distribution of each combustor can be ensured, the peak regulation requirement of the unit is better adapted, and the flexibility of the unit is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a raw coal bin, 2 is a belt coal feeder, 3 is a dryer, 4 is a medium-speed roller coal mill, 5 is a coarse powder separator, 6 is a fine powder separator, 7 is a bag-type dust remover, 8 is a powder exhaust fan, 9 is a waste heat recovery device, 10 is a chimney, 11 is a concentrated powder bin, 12 is a coal powder feeder, 13 is a drying hot air pipe, 14 is a temperature-adjusting cold air pipe, 15 is a powder return pipe, 16 is an air locker, 17 is a wood chip separator, and 18 is an exhaust gas recirculation pipe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the centralized coal pulverizing system for high-moisture lignite coal of the present invention comprises a raw coal bunker 1, a medium-speed roller coal mill 4, a separation system, a bag-type dust collector 7, a centralized coal bunker 11, a fine powder separator 6, a powder discharge fan 8, a waste heat recovery device 9, a chimney 10, an exhaust gas recirculation pipe 18, a temperature-adjusting cold air pipe 14, a drying hot air pipe 13 and a plurality of pulverized coal feeders 12; an outlet of the raw coal bin 1 is communicated with an inlet of a medium-speed roller type coal mill 4, an outlet of the medium-speed roller type coal mill 4 is communicated with an inlet of a separation system, an exhaust gas outlet of the separation system is communicated with an inlet of a bag-type dust remover 7, a powder outlet of the separation system is communicated with an inlet of a concentrated powder bin 11, an outlet at the top of a fine powder separator 6 is communicated with an inlet of the bag-type dust remover 7, an air outlet of the bag-type dust remover 7 is divided into two paths by a powder exhaust fan 8, one path is communicated with a chimney 10 through a waste heat recovery device 9, the other path is communicated with an inlet of the medium-speed roller type coal mill 4 through an exhaust gas recirculation pipe 18, and a temperature-adjusting cold air pipe 14 and a; the powder outlet of the bag-type dust collector 7 is communicated with the concentrated powder bin 11, and the inlet of each coal powder feeder 12 is communicated with the outlet of the concentrated powder bin 11.
Specifically, the separation system comprises a coarse powder separator 5 and a fine powder separator 6, wherein an outlet of the medium-speed roller type coal mill 4 is communicated with an inlet of the coarse powder separator 5, a fine powder outlet at the top of the coarse powder separator 5 is communicated with an inlet of the fine powder separator 6, an outlet at the bottom of the fine powder separator 6 is communicated with an inlet of the concentrated powder bin 11, and an outlet at the top of the fine powder separator 6 is communicated with an inlet of the bag-type dust collector 7.
An outlet at the bottom of the coarse powder separator 5 is communicated with a medium-speed roller coal mill 4 through a powder return pipe 15; an outlet of the raw coal bin 1 is communicated with an inlet of a medium-speed roller type coal mill 4 through a belt coal feeder 2 and a drier 3; the fine powder separator 6 is a primary-secondary fine powder separator; the outlet at the bottom of the fine powder separator 6 is communicated with the inlet of the concentrated powder bin 11 through an air locker 16 and a wood chip separator 17.
The specific working process of the invention is as follows:
raw coal enters a medium-speed roller type coal mill 4 through a raw coal bin 1, a belt coal feeder 2 and a dryer 3 to be milled, coal powder output by the medium-speed roller type coal mill 4 is subjected to coarse powder separation through a coarse powder separator 5, unqualified separated coal powder enters the medium-speed roller type coal mill 4 through a powder return pipe 15, qualified separated coal powder enters a fine powder separator 6 to be separated, qualified separated coal powder enters a concentrated powder bin 11 through an air locker 16 and a sawdust separator 17, exhaust gas output by the fine powder separator 6 enters a bag-type dust remover 7 to be purified, dust collected by the bag-type dust remover 7 is sent to the concentrated powder bin 11, the purified exhaust gas is divided into two paths through a powder exhaust fan 8, one path of the exhaust gas is sent to the medium-speed roller type coal mill 4 through an exhaust gas recirculation pipe 18 to be used as a temperature adjusting medium, and is mixed with dry hot air at a mill inlet output by a dry hot air pipe 13 and temperature adjusting cold air output by a medium speed temperature adjusting air pipe 14 and then enters the roller type, the other path is subjected to waste heat utilization through a waste heat recovery device 9 and then discharged through a chimney 10; a plurality of coal powder feeders 12 are arranged below the concentrated powder bin 11, coal powder is fed into a dense phase conveying system through the coal powder feeders 12, and then the coal powder is conveyed to the front of the furnace remotely by means of compressed air and is carried into a hearth by hot air to be combusted.
Raw coal is firstly put into a dryer 3 for pre-drying, the moisture of the raw coal is reduced to be within 15 percent from 30 to 40 percent, then the raw coal enters a medium-speed roller type coal mill 4 for grinding, the medium-speed roller type coal mill 4 is adopted for processing, a coarse powder separator 5 and a fine powder separator 6 are arranged at the outlet of the medium-speed roller type coal mill 4, qualified coal powder is separated and enters a concentrated powder bin 11 with high explosion-proof function, powder-making exhaust gas enters a bag-type dust remover 7 for dust fall, and purified exhaust gas passes through a waste heat recovery device 9 and then is sent into a chimney 10 for discharge; the pulverized coal in the centralized powder bin 11 is conveyed to a powder bin at the furnace side through a pulverized coal feeder 12 and a concentrated phase conveying system, the pulverized coal is conveyed into a hearth through an impeller powder feeder and primary air, and dry hot air input by the medium-speed roller type coal mill 4 is heated by taking steam extracted by a steam turbine as a heat source.
Claims (6)
1. A centralized pulverizing system for high-moisture lignite coal is characterized by comprising a raw coal bin (1), a medium-speed roller type coal mill (4), a separation system, a bag-type dust remover (7), a centralized powder bin (11), a fine powder separator (6), a powder discharge fan (8), a waste heat recovery device (9), a chimney (10), an exhaust gas recirculation pipe (18), a temperature-adjusting cold air pipe (14), a drying hot air pipe (13) and a plurality of pulverized coal feeders (12);
an outlet of the raw coal bin (1) is communicated with an inlet of a medium-speed roller type coal mill (4), an outlet of the medium-speed roller type coal mill (4) is communicated with an inlet of a separation system, an exhaust gas outlet of the separation system is communicated with an inlet of a bag-type dust collector (7), a powder outlet of the separation system is communicated with an inlet of a concentrated powder bin (11), an outlet of the top of a fine powder separator (6) is communicated with an inlet of the bag-type dust collector (7), an air outlet of the bag-type dust collector (7) is divided into two paths after passing through a powder exhaust fan (8), one path is communicated with a chimney (10) through a waste heat recovery device (9), the other path is communicated with an inlet of the medium-speed roller type coal mill (4) through an exhaust gas recirculation pipe (18), and a temperature adjusting cold air pipe (14) and a drying hot air pipe (13) are communicated with the; the powder outlet of the bag-type dust collector (7) is communicated with the concentrated powder bin (11), and the inlet of each coal powder feeder (12) is communicated with the outlet of the concentrated powder bin (11).
2. The centralized pulverizing system for high-moisture lignite coal kind according to claim 1, characterized in that the separation system comprises a coarse powder separator (5) and a fine powder separator (6), wherein an outlet of the medium speed roller type coal mill (4) is communicated with an inlet of the coarse powder separator (5), a fine powder outlet at the top of the coarse powder separator (5) is communicated with an inlet of the fine powder separator (6), an outlet at the bottom of the fine powder separator (6) is communicated with an inlet of the centralized powder bin (11), and an outlet at the top of the fine powder separator (6) is communicated with an inlet of the bag-type dust collector (7).
3. The centralized pulverizing system for high-moisture lignite coal kind according to claim 2, characterized in that the outlet at the bottom of the coarse powder separator (5) is communicated with the medium speed roller mill (4) through a powder return pipe (15).
4. The centralized pulverizing system for high-moisture lignite coal kind according to claim 1, characterized in that the outlet of the raw coal bunker (1) is communicated with the inlet of the medium speed roller mill (4) through the belt coal feeder (2) and the dryer (3).
5. The centralized pulverizing system for high-moisture lignite coal kind according to claim 2, characterized in that the fine powder separator (6) is a son-mother type fine powder separator.
6. The concentrated pulverizing system for high-moisture lignite coal kind according to claim 2, characterized in that an outlet at the bottom of the fine powder separator (6) is communicated with an inlet of the concentrated powder bin (11) through an air locker (16) and a wood chip separator (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011304076.5A CN112283735A (en) | 2020-11-19 | 2020-11-19 | A centralized pulverizing system for high-moisture lignite coal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011304076.5A CN112283735A (en) | 2020-11-19 | 2020-11-19 | A centralized pulverizing system for high-moisture lignite coal |
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| CN112283735A true CN112283735A (en) | 2021-01-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
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| CN105276608A (en) * | 2015-11-06 | 2016-01-27 | 西安热工研究院有限公司 | Lignite drying residual heat and water recovery system |
| US20170153025A1 (en) * | 2014-05-20 | 2017-06-01 | Tianhua Institute Of Chemical Machinery And Automation Co., Ltd. | Method for drying high moisture, low calorific value lignite for a generating set and recovering water contained therein and apparatus thereof |
| CN207563059U (en) * | 2017-11-16 | 2018-07-03 | 神华集团有限责任公司 | A kind of coal dust preparation system |
| CN109442477A (en) * | 2018-09-30 | 2019-03-08 | 航天神洁（北京）环保科技有限公司 | A kind of plasma igniting test method applied to lignite |
| CN213686896U (en) * | 2020-11-19 | 2021-07-13 | 西安热工研究院有限公司 | A concentrate powder process system for high moisture brown coal kind of coal |
-
2020
- 2020-11-19 CN CN202011304076.5A patent/CN112283735A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN103925605A (en) * | 2014-04-04 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning |
| US20170153025A1 (en) * | 2014-05-20 | 2017-06-01 | Tianhua Institute Of Chemical Machinery And Automation Co., Ltd. | Method for drying high moisture, low calorific value lignite for a generating set and recovering water contained therein and apparatus thereof |
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