CN209801523U - Direct-fired pulverizing system using furnace smoke as drying medium - Google Patents
Direct-fired pulverizing system using furnace smoke as drying medium Download PDFInfo
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- CN209801523U CN209801523U CN201920524054.6U CN201920524054U CN209801523U CN 209801523 U CN209801523 U CN 209801523U CN 201920524054 U CN201920524054 U CN 201920524054U CN 209801523 U CN209801523 U CN 209801523U
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Abstract
The utility model provides an utilize flue gas as drying medium's direct-fired formula powder process system, simple structure sets up rationally, and make full use of boiler flue gas can satisfy the requirement of grinding high moisture coal kind. The system comprises a powder making device and a smoke extraction device; the powder making device comprises a coal feeder, a coal mill and a coarse powder separator which are connected in sequence; a coal powder outlet of the coarse powder separator is connected with a coal powder inlet of the boiler; a coal economizer is arranged in a flue of the boiler, and an induced draft fan is arranged at the outlet of the flue; the flue gas draw-out device include the high temperature flue gas passageway of connecting economizer entry flue all the way, connect the medium temperature flue gas passageway of economizer export flue all the way, connect the low temperature flue gas passageway of draught fan export flue all the way, three routes flue gas passageways insert mixing line input respectively, mixing line output connects the coal pulverizer through the flue gas fan in proper order, lets in mixed flue gas as dry and explosion-proof medium.
Description
Technical Field
The utility model belongs to the technical field of coal-fired power generation, specifically be an utilize stove cigarette as dry medium's direct-fired formula powder process system.
Background
The coal pulverizing system is an important component of a combustion system of a pulverized coal boiler of a power station, and is mainly used for preparing and conveying pulverized coal and providing a pulverized coal mixture with qualified fineness and air-powder mixture with proper temperature for the boiler. Pulverized coal boilers can be divided into lean coal anthracite boilers, bituminous coal boilers and lignite boilers according to different fuel properties, and the design and model selection of a pulverizing system are performed according to different coal types, and one pulverizing system is only suitable for one type of coal.
Under the conditions of complex change of the current coal market and frequent fluctuation of the coal price, the prices of lignite, lean coal, anthracite and bituminous coal are often in large difference and have large fluctuation range, and the coal pulverizing system only suitable for single coal type influences the coal purchasing economy and the fuel supply safety of a power plant to a great extent.
The phenomenon that the drying output of a powder making system is insufficient often appears when high-moisture coal is ground in a traditional positive-pressure direct-fired power station boiler of the powder making system, and the load capacity of the boiler is seriously influenced.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides an utilize flue gas as dry medium's direct-fired formula powder process system, simple structure sets up rationally, and make full use of boiler flue gas can satisfy the requirement of grinding high moisture coal kind.
The utility model discloses a realize through following technical scheme:
a direct-fired pulverizing system using furnace smoke as a drying medium comprises a pulverizing device and a smoke extraction device;
the powder making device comprises a coal feeder, a coal mill and a coarse powder separator which are connected in sequence; a coal powder outlet of the coarse powder separator is connected with a coal powder inlet of the boiler; a coal economizer is arranged in a flue of the boiler, and an induced draft fan is arranged at the outlet of the flue;
The flue gas draw-out device include the high temperature flue gas passageway of connecting economizer entry flue all the way, connect the medium temperature flue gas passageway of economizer export flue all the way, connect the low temperature flue gas passageway of draught fan export flue all the way, three routes flue gas passageways insert mixing line input respectively, mixing line output connects the coal pulverizer through the flue gas fan in proper order, lets in mixed flue gas as dry and explosion-proof medium.
Preferably, the high-temperature flue gas channel is provided with a high-temperature flue gas adjusting door, the medium-temperature flue gas channel is provided with a medium-temperature flue gas adjusting door, the low-temperature flue gas channel is provided with a low-temperature flue gas adjusting door, and the mixing pipeline is provided with a mixing adjusting door; the outlet of the furnace smoke fan is connected with a coal mill through an outlet adjusting door of the furnace smoke fan and an outlet stop door of the furnace smoke fan.
Preferably, the outlet of the coarse powder separator is connected with the pulverized coal inlet of the pulverized coal burner through the pulverized coal distributor, the outlet of the pulverized coal burner is connected with the pulverized coal inlet of the boiler, and the isolation door is arranged between the pulverized coal distributor and the pulverized coal burner.
Further, an air preheater located at the downstream of the economizer is arranged in a flue of the boiler, a secondary air inlet of the air preheater is connected with an outlet of a blower, and a secondary air outlet of the air preheater is connected with a secondary air inlet of the pulverized coal burner through a secondary air box.
And furthermore, a hot primary air inlet of the air preheater is connected with an outlet of the primary fan, and a hot primary air outlet of the air preheater is connected with a primary air inlet of the coal mill.
Furthermore, the outlet of the primary air fan is respectively connected with the primary air inlet of the coal mill and the inlet of the sealing air fan; and the outlet of the sealing fan is respectively connected with the coal mill, the coarse powder separator and the coal feeder and used for providing sealing air.
Furthermore, a hot primary air outlet of the air preheater is connected with a primary air inlet of the coal mill through a hot air adjusting door and an air quantity measuring device in sequence; the outlet of the primary air fan is connected with the inlet end of the hot air adjusting door.
preferably, the outlet of the raw coal hopper is connected with the inlet of the coal feeder for supplying coal.
Compared with the prior art, the utility model discloses following profitable technological effect has:
The utility model discloses can be according to the requirement of different coal types, utilize the flue gas fan to mix the high temperature flue gas that the boiler afterbody different regions extracted, medium temperature flue gas, low temperature flue gas and regard as the high temperature medium, send into the coal pulverizer of medium speed and improve the dry power of powder process system as dry and explosion-proof medium, can control flue gas temperature through the adjustment to three routes flue gas extraction volume to the requirement of different coal types, and finally carry the buggy through the coarse powder separator and let in the boiler, can not influence the holistic state balance in the boiler; the adaptability of the coal pulverizing system to coal types can be effectively improved through the direct-fired coal pulverizing system.
furthermore, the mixed flue gas and the hot-blast certain proportion of coal pulverizer entry mix the back and get into the powder process system and grind the raw coal, and the hot-blast temperature adjustment to letting in the new trend of the hot-blast and cold wind realization of coal pulverizer entry to the atmosphere temperature in the coal pulverizer that can be better carries out secondary adjustment and cooperation, and better adaptation corresponds the coal type.
Drawings
Fig. 1 is a schematic structural diagram of a novel direct-fired pulverizing system using furnace smoke as a drying medium.
Wherein: 1. a boiler; 2. an air preheater; 3. a blower; 4. a primary air fan; 5. sealing the fan; 6. a coal mill; 7. a coarse powder separator; 8. an air volume measuring device; 9. a raw coal hopper; 10. a coal feeder; 11. a pulverized coal distributor; 12. an isolation door; 13. a pulverized coal burner; 14. a secondary air box; 15. a high temperature flue gas regulating gate; 16. a medium temperature flue gas regulating gate; 17. a low temperature flue gas regulating gate; 18. a mixing adjustment gate; 19. a fume fan; 20. an outlet regulating door of the smoke blower; 21. a furnace smoke fan outlet stop gate; 22. a hot air adjusting door; 23. a coal economizer; 24. an induced draft fan.
Detailed Description
the present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
referring to fig. 1, the utility model relates to an utilize direct-fired formula powder process system of flue gas as drying medium, including air heater 2, forced draught blower 3, primary air fan 4, sealing fan 5, coal pulverizer 6, middlings separator 7, raw coal fill 9, coal feeder 10, pulverized coal distributor 11, isolated door 12, burner 13, secondary air box 14, high temperature flue gas damper 15, medium temperature flue gas damper 16, low temperature flue gas damper 17, mixed damper 18, flue gas fan 19, flue gas fan export damper 20, flue gas fan export stop gate 21, hot-blast damper 22, economizer 23, draught fan 24.
The raw coal hopper 9 is used for supplying coal to the coal feeder 10, the outlet of the coal feeder 10 is connected with the raw coal inlet of the coal pulverizer 6, the coal powder outlet of the coal pulverizer 6 is connected with the inlet of the coarse powder separator 7, the outlet of the coarse powder separator 7 is connected with the inlet of the coal powder distributor 11, the outlet of the coal powder distributor 11 is connected with the coal powder inlet of the coal powder burner 13, the outlet of the coal powder burner 13 is connected with the air and coal powder inlets of the boiler 1, and the isolation door 12 is arranged between the coal powder distributor 11 and the coal powder burner 13;
The outlet of the blower 3 is connected with the secondary air inlet of the air preheater 2, the secondary air outlet of the air preheater 2 is connected with the inlet of the secondary air box 14, and the outlet of the secondary air box 14 is connected with the secondary air inlet of the pulverized coal burner 13;
The export of primary air fan 4 is divided into two cold primary air passageways and hot primary air passageway, and the hot primary air entry of air heater 2 is connected to hot primary air passageway, and the primary air entry of the hot primary air exit linkage coal pulverizer 6 of air heater 2, and cold primary air passageway is divided into two tunnel, links to each other with the primary air entry of coal pulverizer 6 all the way, links to each other with the entry of sealing fan 5 all the way, and sealing fan 5 is used for providing sealed air for coal pulverizer 6 and coarse powder separator 7 and feeder 10.
The tail smoke of the extraction boiler 1 is divided into three paths, one path is high-temperature smoke and is connected with an inlet flue of the economizer 23, the other path is medium-temperature smoke and is connected with an outlet flue of the economizer 23, the other path is low-temperature smoke and is connected with an outlet flue of the induced draft fan 24, and the three paths of smoke are connected with the coal mill 6 to serve as drying and explosion-proof media.
Wherein, the air quantity measuring device 8 and the hot air adjusting door 22 are arranged on a primary air inlet end pipeline of the coal mill 6.
Furthermore, a high-temperature furnace smoke adjusting door 15, a medium-temperature furnace smoke adjusting door 16, a low-temperature furnace smoke adjusting door 17 and a mixing adjusting door 18 are arranged on an inlet pipeline of the furnace smoke fan 19, and a furnace smoke fan outlet adjusting door 20 and a furnace smoke fan outlet stop door 21 are arranged on an outlet pipeline of the furnace smoke fan 19.
The utility model relates to an utilize novel direct-fired formula powder process system of stove cigarette as drying medium, including following step:
1) After high-temperature furnace smoke, medium-temperature furnace smoke and low-temperature furnace smoke at the tail part of the boiler are pressurized by a furnace smoke blower 19, the pressurized furnace smoke is sent into a coal mill 6;
2) after being pressurized by a blower 3, natural cold air enters an air preheater 2 and is heated to a preset temperature, then is sent into a secondary air box 14 through a pipeline and then is sent into a boiler 1 through a pulverized coal burner 13;
3) After the natural cold air is boosted by the primary air fan 4, one part of the cold primary air with pressure is divided into two paths: one path is sent into a sealing fan 5 through a pipeline, and the other path is sent into a primary air inlet of a coal mill 6 through a pipeline;
4) After natural cold air is boosted by a primary air fan 4, a part of the natural cold air is heated by an air preheater 2 to form hot primary air, and the hot primary air is sent to a coal mill 6;
5) The cold primary air, the hot primary air and the furnace smoke are mixed with raw coal which is fed into a coal mill 6 through a raw coal bin 9 and a coal feeder 10, pulverized coal which is milled is fed into a pulverized coal burner 13 through a pulverized coal separator 7 under the conveying of hot air, and the pulverized coal burner 13 organizes the combustion in a boiler 1.
the utility model discloses can satisfy the high moisture coal kind of the formula of directly blowing milling system mill, can be according to different coal kinds, adjustment milling system entry wind-warm syndrome satisfies the dry output of milling system, improves boiler coal kind adaptability, guarantees milling system safety, economic operation.
Claims (8)
1. A direct-fired pulverizing system using furnace smoke as a drying medium is characterized by comprising a pulverizing device and a smoke extraction device;
The powder making device comprises a coal feeder (10), a coal mill (6) and a coarse powder separator (7) which are connected in sequence; a coal powder outlet of the coarse powder separator (7) is connected with a coal powder inlet of the boiler (1); a coal economizer (23) is arranged in a flue of the boiler (1), and an induced draft fan (24) is arranged at the outlet of the flue;
The flue gas draw-out device include the high temperature flue gas passageway of connecting economizer (23) entry flue all the way, connect the medium temperature flue gas passageway of economizer (23) export flue all the way, connect the low temperature flue gas passageway of draught fan (24) export flue all the way, three routes flue gas passageways insert mixing line input respectively, mixing line output connects coal pulverizer (6) through stove smoke blower (19) in proper order, lets in mixed flue gas as dry and explosion-proof medium.
2. a direct-fired pulverizing system using flue gas as drying medium according to claim 1, wherein the high-temperature flue gas passage is provided with a high-temperature flue gas regulating gate (15), the medium-temperature flue gas passage is provided with a medium-temperature flue gas regulating gate (16), the low-temperature flue gas passage is provided with a low-temperature flue gas regulating gate (17), and the mixing pipe is provided with a mixing regulating gate (18); the outlet of the furnace smoke blower (19) is connected with the coal mill (6) through a furnace smoke blower outlet adjusting door (20) and a furnace smoke blower outlet stop door (21).
3. a direct-blowing pulverizing system using furnace smoke as drying medium according to claim 1, characterized in that the outlet of the coarse powder separator (7) is connected to the pulverized coal inlet of the pulverized coal burner (13) through the pulverized coal distributor (11), the outlet of the pulverized coal burner (13) is connected to the pulverized coal inlet of the boiler (1), and the isolation door (12) is disposed between the pulverized coal distributor (11) and the pulverized coal burner (13).
4. a direct-blowing pulverizing system using furnace smoke as drying medium according to claim 3, characterized in that an air preheater (2) is arranged in the flue of the boiler (1) and located downstream of the economizer (23), the secondary air inlet of the air preheater (2) is connected with the outlet of the blower (3), and the secondary air outlet of the air preheater (2) is connected with the secondary air inlet of the pulverized coal burner (13) through the secondary air box (14).
5. A direct-fired pulverizing system using furnace smoke as drying medium in accordance with claim 4, characterized in that the hot primary air inlet of the air preheater (2) is connected to the outlet of the primary air fan (4), and the hot primary air outlet of the air preheater (2) is connected to the primary air inlet of the coal pulverizer (6).
6. A direct-fired pulverizing system using furnace smoke as drying medium according to claim 5, characterized in that the outlet of the primary air blower (4) is connected to the primary air inlet of the coal mill (6) and the inlet of the sealing air blower (5); the outlet of the sealing fan (5) is respectively connected with the coal feeding machine (6), the coarse powder separator (7) and the coal feeding machine (10) and used for providing sealing air.
7. A direct-fired pulverizing system using furnace smoke as drying medium according to claim 5, characterized in that the hot primary air outlet of the air preheater (2) is connected to the primary air inlet of the coal mill (6) through the hot air adjusting door (22) and the air quantity measuring device (8) in turn; the outlet of the primary air fan (4) is connected with the inlet end of a hot air adjusting door (22).
8. A direct-fired pulverizing system using furnace fume as drying medium in accordance with claim 1, characterized in that the outlet of the raw coal hopper (9) is connected to the inlet of the coal feeder (10) for supplying coal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920524054.6U CN209801523U (en) | 2019-04-17 | 2019-04-17 | Direct-fired pulverizing system using furnace smoke as drying medium |
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| CN201920524054.6U CN209801523U (en) | 2019-04-17 | 2019-04-17 | Direct-fired pulverizing system using furnace smoke as drying medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959023A (en) * | 2019-04-17 | 2019-07-02 | 西安西热锅炉环保工程有限公司 | It is a kind of using furnace cigarette as the unit pulverized-coal system of dried medium and method |
| CN113446617A (en) * | 2021-07-28 | 2021-09-28 | 西安热工研究院有限公司 | Power generation system of pulverized coal burner direct-fired coupling living beings |
| CN113685837A (en) * | 2021-08-24 | 2021-11-23 | 西安西热锅炉环保工程有限公司 | Multi-medium dry biomass direct coupling power generation system and method |
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2019
- 2019-04-17 CN CN201920524054.6U patent/CN209801523U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959023A (en) * | 2019-04-17 | 2019-07-02 | 西安西热锅炉环保工程有限公司 | It is a kind of using furnace cigarette as the unit pulverized-coal system of dried medium and method |
| CN113446617A (en) * | 2021-07-28 | 2021-09-28 | 西安热工研究院有限公司 | Power generation system of pulverized coal burner direct-fired coupling living beings |
| CN113685837A (en) * | 2021-08-24 | 2021-11-23 | 西安西热锅炉环保工程有限公司 | Multi-medium dry biomass direct coupling power generation system and method |
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