CN213686896U - A concentrate powder process system for high moisture brown coal kind of coal - Google Patents
A concentrate powder process system for high moisture brown coal kind of coal Download PDFInfo
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- CN213686896U CN213686896U CN202022698422.4U CN202022698422U CN213686896U CN 213686896 U CN213686896 U CN 213686896U CN 202022698422 U CN202022698422 U CN 202022698422U CN 213686896 U CN213686896 U CN 213686896U
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- 239000000843 powder Substances 0.000 title claims abstract description 132
- 239000003245 coal Substances 0.000 title claims abstract description 104
- 239000003077 lignite Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title description 9
- 239000012141 concentrate Substances 0.000 title description 5
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000010298 pulverizing process Methods 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000002918 waste heat Substances 0.000 claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 description 17
- 239000000779 smoke Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 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
- 230000007547 defect Effects 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
- 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
- 238000000746 purification 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本实用新型公开了一种用于高水分褐煤煤种的集中制粉系统，原煤仓的出口与中速辊式磨煤机的入口相连通，中速辊式磨煤机的出口与分离系统的入口相连通，分离系统的乏气出口与布袋除尘器的入口相连通，分离系统的出粉口与集中粉仓的入口相连通，细粉分离器顶部的出口与布袋除尘器的入口相连通，布袋除尘器的出风口经排粉风机后分为两路，其中一路经余热回收装置与烟囱相连通，另一路经乏气再循环管与中速辊式磨煤机的入口相连通，调温冷风管及干燥热风管与中速辊式磨煤机的入口相连通；布袋除尘器的出粉口与集中粉仓相连通，各煤粉给料器的入口与集中粉仓的出口相连通，该系统的安全性较高，经济性较好，使用寿命长，且结构较为简单。
The utility model discloses a centralized pulverizing system for high-moisture lignite coal. The inlet is connected, the exhaust gas outlet of the separation system is connected with the inlet of the bag filter, the powder outlet of the separation system is connected with the inlet of the centralized powder bin, and the outlet at the top of the fine powder separator is connected with the inlet of the bag filter. The air outlet of the bag filter is divided into two paths after the powder discharge fan, one of which is connected to the chimney through the waste heat recovery device, and the other is connected to the inlet of the medium-speed roller mill through the spent gas recirculation pipe, and the temperature is adjusted. The cold air duct and the drying hot air duct are communicated with the inlet of the medium-speed roller mill; the powder outlet of the bag filter is communicated with the centralized powder silo, and the inlet of each pulverized coal feeder is communicated with the outlet of the centralized powder silo , The system has high safety, good economy, long service life and simple structure.
Description
Technical Field
The utility model relates to a powder process system, concretely relates to concentrate powder process system for high moisture brown coal kind.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a concentrate powder process system for high moisture brown coal kind, the security of this system is higher, and economic nature is better, long service life, and the structure is comparatively simple, arranges comparatively in a flexible way, and the powder distribution is comparatively convenient.
In order to achieve the purpose, 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 pulverized coal 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 utility model discloses following beneficial effect has:
a concentrate powder process system for high moisture brown coal kind when concrete operation, the raw coal gets into the desiccator earlier and carries out the predrying, reduce raw coal moisture by 30% -40% to within 15%, grind the system in getting into the medium speed roller mill again, with the realization to the processing of high moisture brown coal kind, security and economic nature are higher, long service life, the buggy of medium speed roller mill output enters into the piece-rate system and separates, wherein, the buggy of isolating enters into in concentrating the powder storehouse, it has a plurality of buggy dispensers to have through concentrating the powder storehouse, send into dense phase conveying system with the buggy through the buggy dispenser, rely on before compressed air with buggy remote transport stove again, carry into furnace burning by hot-blast, the structure is comparatively simple, arrange comparatively nimble, the distribution of powder volume is comparatively convenient, what need explain, adopt the utility model discloses replace traditional roller mill and fan mill formula coal mill straight blow formula powder process system to grind high moisture The moisture lignite can effectively reduce the moisture of the coal as fired, which is equivalent to improving the heat value of the coal as fired, and simultaneously, the exhaust gas temperature, the moisture content in the flue gas, the flue gas amount 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 present invention will be described in further detail 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 utility model discloses a concrete working process does:
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.
The utility model discloses advance into desiccator 3 with the raw coal and carry out the predrying, reduce raw coal moisture by 30% -40% to within 15%, get into intermediate speed roller mill 4 again and grind, adopt intermediate speed roller mill 4 to handle, intermediate speed roller mill 4 export sets up coarse powder separator 5 and fine powder separator 6, the qualified buggy that separates gets into concentrated powder storehouse 11 that has high explosion-proof function, the powder process exhaust gas gets into 7 dust fall of sack cleaner, the exhaust gas of purification is sent into chimney 10 behind waste heat recovery unit 9 and is discharged; 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)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022698422.4U CN213686896U (en) | 2020-11-19 | 2020-11-19 | A concentrate powder process system for high moisture brown coal kind of coal |
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| CN202022698422.4U CN213686896U (en) | 2020-11-19 | 2020-11-19 | A concentrate powder process system for high moisture brown coal kind of coal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283735A (en) * | 2020-11-19 | 2021-01-29 | 西安热工研究院有限公司 | A centralized pulverizing system for high-moisture lignite coal |
| CN113617471A (en) * | 2021-08-04 | 2021-11-09 | 苏州西热节能环保技术有限公司 | A system that can reduce the cooling air volume of steel ball mill |
| CN116592385A (en) * | 2023-03-31 | 2023-08-15 | 华能聊城热电有限公司 | Concentration adjustment mechanism, fine powder separator and enrichment powder feeding system |
-
2020
- 2020-11-19 CN CN202022698422.4U patent/CN213686896U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283735A (en) * | 2020-11-19 | 2021-01-29 | 西安热工研究院有限公司 | A centralized pulverizing system for high-moisture lignite coal |
| CN113617471A (en) * | 2021-08-04 | 2021-11-09 | 苏州西热节能环保技术有限公司 | A system that can reduce the cooling air volume of steel ball mill |
| CN116592385A (en) * | 2023-03-31 | 2023-08-15 | 华能聊城热电有限公司 | Concentration adjustment mechanism, fine powder separator and enrichment powder feeding system |
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