CN202532843U - High-moisture brown coal pre-drying system for coal-fired power plant - Google Patents
High-moisture brown coal pre-drying system for coal-fired power plant Download PDFInfo
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- CN202532843U CN202532843U CN2012201973438U CN201220197343U CN202532843U CN 202532843 U CN202532843 U CN 202532843U CN 2012201973438 U CN2012201973438 U CN 2012201973438U CN 201220197343 U CN201220197343 U CN 201220197343U CN 202532843 U CN202532843 U CN 202532843U
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Abstract
The utility model discloses a high-moisture brown coal pre-drying system for a coal-fired power plant. A fan powder milling system is adopted for pre-drying in a boiler powder milling system of a brown coal-fired power plant, severe air leakage problem and high potential safety hazard exist, and as moisture in raw coal is evaporated in the powder milling system and a boiler hearth, high pulverized coal consumption is required in the process of evaporating raw coal. The high-moisture brown coal pre-drying system comprises a raw coal conveying device for inputting raw coal through a power plant coal conveying system and a dry coal conveying device for outputting dry coal to the power plant coal conveying system, and the high-moisture brown coal pre-drying system is characterized in that a raw coal storage device and a raw coal pre-drying device are arranged between the raw coal conveying device and the dry coal conveying device; the raw coal pre-drying device is connected with a steam and condensate conveying device; and the tail of the raw coal pre-drying device is provided with a dried tail gas dust removal device. According to the high-moisture brown coal pre-drying system for the coal-fired power plant, a medium-speed powder milling system which is stable and reliable in operation and low in investment operating cost can be adopted in the power plant boiler powder milling system, and the equipment scales of a boiler and the powder milling system are reduced.
Description
Technical field
The utility model relates to drying system, specifically a kind of coal-burning power plant predrying system of high-moisture brown coal.
Background technology
Present domestic low-order coal dry technology great majority are in test or industrial demonstration phase, and for combustion brown coal power plant, it is predrying that boiler milling system often adopts fanned powder-grinding system to carry out, and goes into the stove moisture content of coal to reduce.The fanned powder-grinding system one-time investment is big, and operation stability is relatively poor, and the shock plate wearing and tearing are big, and maintenance workload is big, and operation and maintenance cost is high, for high-moisture (greater than 58%%) brown coal, does not have fan to grind the achievement of making and moving especially.Fanned powder-grinding system is smoked high temperature furnace and is carried out drying; There is the more serious problem of leaking out; Potential safety hazard is big, and the moisture in the raw coal evaporates in pulverized coal preparation system and boiler furnace, and required heat is that coal dust provides from the burning in boiler; Moisture in the evaporation raw coal need consume coal dust, and consumption is big.
The utility model content
In order to address the above problem; The utility model provides a kind of coal-burning power plant predrying system of high-moisture brown coal; Its brown coal with high-moisture carry out predrying; Operation is more reliable and more stable so that the boiler of power plant pulverized coal preparation system adopts, the lower medium-speed pulverizer pulverized coal preparation system of investment operating cost, reduces furnace coal weight, reduces boiler and pulverized coal preparation system equipment scale thereof.
For realizing above-mentioned purpose; The utility model adopts following technical scheme: a kind of coal-burning power plant predrying system of high-moisture brown coal; Comprise the dry coal transport of exporting dry coal by the raw coal transport of power plant's coal handling system input raw coal with to power plant's coal handling system; It is characterized in that; Be provided with raw coal storage device and raw coal pre-drying device between described raw coal transport and the dry coal transport, the raw coal pre-drying device is connected with steam and lime set transport, and the afterbody of raw coal pre-drying device is provided with the dried tail gas dust arrester.
As preferably, described raw coal storage device comprises run coal bin and the rotation coal bunker that is connected the run coal bin bottom, to realize with power plant's coal handling system method of operation coupling and to prevent coal bunker outlet chute blockage.
As preferably, described raw coal pre-drying device comprises with the low-pressure superheated steam being the steam pipe swinging main drying of drying medium indirect heat exchange, Gravimetric Coal Feeders that raw coal gets into main drying or conveying worm and dry back coal are delivered to the dry coal transport from main drying conveying worm or drag conveyor.
As preferably, described steam and lime set transport comprise behind the steam pipeline system of extracted steam from turbine and steam heat-exchanging and are used for lime set jar, lime set pump and the pipe-line system that lime set stores and carries.
As preferably, described dried tail gas dust arrester comprises deduster, air-introduced machine and aiutage.
As preferably, described deduster is dry collector or wet scrubber.Dry collector can be selected cyclone separator, sack cleaner, electrostatic precipitator, electric-bag complex dust collector etc. for use; Wet scrubber can be selected Venturi wet-process deduster, disintegrating scrubber, wet scrubbing tower etc. for use.
As preferably, described raw coal transport and dry coal transport are connected through transfer station with the power plant coal handling system.
As preferably, described raw coal storage device adopts the through type arrangement, and the raw coal pre-drying device arranges along raw coal transport and dry transport depth direction, and vertical with the dry coal transport with the raw coal transport.
Described raw coal transport comprises ribbon conveyer, coal plough and electronic baffle plate threeway, can realize that raw coal carries switching between the predrying system of raw coal and power plant's coal handling system.Described dry coal transport comprises ribbon conveyer, coal plough and electronic baffle plate threeway, can realize that dried coal directly gets into power plant's main building coal bunker or gets into indoor coal storage yard.
The quantity of said raw coal storage device and raw coal pre-drying device can vertically increase along raw coal and dry coal transport, at this moment the length extend longitudinally of raw coal and dry coal transport.
The beneficial effect of the utility model: coal handling system is included a predrying system of bypass raw coal in the coal-burning power plant; Raw coal can directly arrive the main building coal bunker by power plant's coal handling system; Also can after the predrying system of raw coal drying, get into the main building coal bunker again, when boiler load changed, dried coal also can get into indoor coal storage yard; The predrying system of raw coal includes power plant's coal handling system operational management in, realizes slitless connection fully with the power plant coal handling system.Simultaneously, adopt the later low-quality steam of steam turbine acting as drying medium, the condensate liquid behind the steam heat-exchanging is got back to oxygen-eliminating device system of power plant, forms closed cycle, with waste heat recovery, reduces heat loss, and energy savings reduces carbon emission, improves boiler efficiency.Raw coal is after predrying, and the big minimizing of furnace coal weight reduces carbon emission, and boiler and pulverized coal preparation system equipment scale thereof reduce greatly simultaneously, and pulverized coal preparation system adopts stable, safe and reliable medium-speed pulverizer system, reduces one-time investment and operation and maintenance cost.
Below in conjunction with the Figure of description and the specific embodiment the utility model is described further.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure, 1. raw coal transport, 2. run coal bin, 3. rotation coal bunker, 4. Gravimetric Coal Feeders; 5. main drying, 6. conveying worm or drag conveyor, 7. dry coal transport, 8. lime set jar; 9. lime set pump, 10. deduster, 11. air-introduced machines, 12. dredge pumps; 13. the humidification blender, 14. aiutages, 15. raw coal transfer stations, 16. dry coal transfer stations.
The specific embodiment
The coal-burning power plant predrying system of high-moisture brown coal as shown in Figure 1; Its raw coal transport 1, form to dry coal transport 7, raw coal storage device and the raw coal pre-drying device of power plant's coal handling system output dry coal by power plant coal handling system input raw coal; The raw coal pre-drying device is connected with steam and lime set transport, and the afterbody of raw coal pre-drying device is provided with the dried tail gas dust arrester.
Described raw coal storage device is made up of run coal bin 2 and the rotation coal bunker 3 that is connected the run coal bin bottom.Described raw coal pre-drying device is made up of from the conveying worm 6 that main drying is delivered to the dry coal transport Gravimetric Coal Feeders 4 and dry back coal that the steam pipe swinging main drying 5, raw coal that with the low-pressure superheated steam are the drying medium indirect heat exchange get into main drying.Lime set stores and lime set jar 8, lime set pump 9 and the pipe-line system of carrying are formed by behind the steam pipeline system of extracted steam from turbine and steam heat-exchanging, being used for for described steam and lime set transport.Described dried tail gas dust arrester is made up of deduster 10, air-introduced machine 11 and aiutage 14, and deduster 10 is selected dry collector or wet scrubber for use.Described raw coal transport is connected through raw coal transfer station 15 with the power plant coal handling system, and described dry coal transport is connected through dry coal transfer station 16 with the power plant coal handling system.The raw coal storage device adopts the through type arrangement, and the raw coal pre-drying device arranges along raw coal transport and dry transport depth direction, and vertical with the dry coal transport with the raw coal transport.
The brief description of the process of the utility model is following: raw coal gets into raw coal transport 1 by the raw coal transfer station after fragmentation; Be dispensed to each run coal bin 2 then; Draw off through rotation coal bunker 3 and to get into Gravimetric Coal Feeders 4, join after the quantitative analysis in main drying 5 cylindrical shells, raw coal in main drying 5 cylindrical shells with the drying tube indirect heat exchange that is connected with steam; Moisture constantly evaporates; Become the dry coal of the moisture that requires when arriving main drying 5 discharging openings, dried coal is transported on the dry coal transport 7 through conveying worm 6, is back to power plant's induction system or directly gets into the main building coal bunker or the entering indoor coal storage yard via the dry coal transfer station.Low-pressure steam as drying medium extracts from power plant steam turbine; Get into the drying tube in the steam-tube rotatory dryer by steam pipework and the control of valve group; Behind drying tube and the raw coal indirect heat exchange, steam is condensed into saturation water, in drying machine 5, discharges entering lime set jar 8; Then via 9 dozens of lime set pumps to oxygen-eliminating device system of power plant, recycle.Discharge by aiutage 14 after the moisture that raw coal is evaporated dedusting in air-introduced machine 11 is pumped to deduster 10 is up to standard.The coal dust that dry collector is collected is through being back on the dry coal transport 7 behind the humidification blender 13.Wet scrubber is collected contains coal waste water and gets to power plant's coal water treatment system through waste water pump 12 and focus on.The utility model is provided with dried tail gas oxygen analysis and checkout gear, in main drying 5, feeds inert gas (protection steam or nitrogen) when exceeding standard when oxygen contains.The utility model also is provided with dry back coal temperature checkout gear, when dried coal temperature is too high, sprays into humidification water to main drying 5, guarantees security of system stable operation.
Claims (8)
1. coal-burning power plant predrying system of high-moisture brown coal; Comprise the dry coal transport (7) of exporting dry coal by the raw coal transport (1) of power plant's coal handling system input raw coal with to power plant's coal handling system; It is characterized in that; Be provided with raw coal storage device and raw coal pre-drying device between described raw coal transport and the dry coal transport, the raw coal pre-drying device is connected with steam and lime set transport, and the afterbody of raw coal pre-drying device is provided with the dried tail gas dust arrester.
2. the coal-burning power plant according to claim 1 predrying system of high-moisture brown coal is characterized in that, described raw coal storage device comprises run coal bin (2) and is connected the rotation coal bunker (3) of run coal bin bottom.
3. the coal-burning power plant according to claim 1 and 2 predrying system of high-moisture brown coal; It is characterized in that described raw coal pre-drying device comprises with the low-pressure superheated steam being the steam pipe swinging main drying (5) of drying medium indirect heat exchange, the Gravimetric Coal Feeders (4) of raw coal entering main drying and dry back coal is delivered to the dry coal transport from main drying conveying worm (6) or drag conveyor.
4. the coal-burning power plant according to claim 3 predrying system of high-moisture brown coal; It is characterized in that described steam and lime set transport comprise and be used for lime set jar (8), lime set pump (9) and the pipe-line system that lime set stores and carries behind the steam pipeline system of extracted steam from turbine and the steam heat-exchanging.
5. the coal-burning power plant according to claim 3 predrying system of high-moisture brown coal is characterized in that, described dried tail gas dust arrester comprises deduster (10), air-introduced machine (11) and aiutage (14).
6. the coal-burning power plant according to claim 5 predrying system of high-moisture brown coal is characterized in that described deduster (10) is dry collector or wet scrubber.
7. the coal-burning power plant according to claim 1 predrying system of high-moisture brown coal is characterized in that, described raw coal transport and dry coal transport are connected through transfer station with the power plant coal handling system.
8. the coal-burning power plant according to claim 1 predrying system of high-moisture brown coal; It is characterized in that; Described raw coal storage device adopts the through type arrangement; The raw coal pre-drying device arranges along raw coal transport and dry transport depth direction, and vertical with the dry coal transport with the raw coal transport.
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| CN2012201973438U CN202532843U (en) | 2012-05-02 | 2012-05-02 | High-moisture brown coal pre-drying system for coal-fired power plant |
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| CN2012201973438U CN202532843U (en) | 2012-05-02 | 2012-05-02 | High-moisture brown coal pre-drying system for coal-fired power plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373947A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN104373951A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN107450469A (en) * | 2017-09-29 | 2017-12-08 | 四川德胜集团钒钛有限公司 | A kind of system and its adjusting method for being used to adjust raw coal moisture |
| CN108679969A (en) * | 2018-05-19 | 2018-10-19 | 芜湖中淇节能科技有限公司 | A kind of uniform dryer for low-order coal |
-
2012
- 2012-05-02 CN CN2012201973438U patent/CN202532843U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373947A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN104373951A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN107450469A (en) * | 2017-09-29 | 2017-12-08 | 四川德胜集团钒钛有限公司 | A kind of system and its adjusting method for being used to adjust raw coal moisture |
| CN108679969A (en) * | 2018-05-19 | 2018-10-19 | 芜湖中淇节能科技有限公司 | A kind of uniform dryer for low-order coal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang Rongzhi Energy Technology Co., Ltd. Assignor: Ceng Yongjian|Xu Furong Contract record no.: 2014330000003 Denomination of utility model: High-moisture brown coal pre-drying system for coal-fired power plant Granted publication date: 20121114 License type: Exclusive License Record date: 20140113 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20180502 |
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| CF01 | Termination of patent right due to non-payment of annual fee |