CN201897215U - Circulating fluidized bed boiler system capable of burning stone coal - Google Patents
Circulating fluidized bed boiler system capable of burning stone coal Download PDFInfo
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- CN201897215U CN201897215U CN2010205961638U CN201020596163U CN201897215U CN 201897215 U CN201897215 U CN 201897215U CN 2010205961638 U CN2010205961638 U CN 2010205961638U CN 201020596163 U CN201020596163 U CN 201020596163U CN 201897215 U CN201897215 U CN 201897215U
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Abstract
The utility model discloses a circulating fluidized bed boiler system capable of burning stone coal, which comprises a stone coal preparing and feeding system, a circulating fluidized bed boiler body, a circulating ash discharge cooler, a slag cooler, an ash and slag conveying system and an air feeder. The stone coal preparing and feeding system and the air feeder are respectively connected with the circulating fluidized bed boiler body and are used for feeding coal and air to the inside of the circulating fluidized bed boiler body, and the circulating ash discharge cooler and the slag cooler are respectively connected to the bottom of the circulating fluidized bed boiler body and are further connected with the ash and slag conveying system. The circulating fluidized bed boiler system greatly increases arrangement flexibility and operation reliability, and simultaneously reduces power consumption of an auxiliary engine of a CFB (circulating fluidized bed) boiler.
Description
Technical field
The utility model relates to a kind of circulating fluidized bed boiler systems of the bone coal that burns, and belongs to the energy and power industry field.
Technical background
At present, more than 3000kCal/kg, the calorific value that uses fuel on a small quantity is low to moderate 2500kCal/kg to the calorific value that recirculating fluidized bed (CFB) boiler uses fuel, at home and abroad there is no and uses the report that calorific value is lower than 2500kCal/kg fuel for a long time usually.With respect to conventional boiler fuel, the bone coal calorific value is low, ash is high (the As-received ash can reach more than 70%), the coal ash wearing character is strong, even consider suitably to mix burning, the bone coal fuel value that need use has exceeded the fuel scope of application of existing conventional CFB boiler in 1000～2300kCal/kg scope.When the CFB boiler is considered to use bone coal, the time have coal supply system and dreg removing system difficult arrangement in design, problem such as the big and subsidiary engine power consumption height of heating surface wear speed when causing moving greatly because of ash, can reduce the reliability and the availability of boiler, even make bone coal CFB boiler be difficult to normal operation.
The utility model content
The purpose of this utility model is to solve the CFB boiler and uses the problems referred to above that bone coal brings, by existing CFB boiler island system is adopted the specific aim design, increase substantially the flexibility and the reliability of operation of system layout, reduce the power consumption of CFB boiler accessory machinery simultaneously.
At shortcoming above-mentioned in the prior art, the utility model provides a kind of circulating fluidized bed boiler systems of the bone coal that burns, and comprises bone coal preparation and coal supply system, circulating fluid bed boiler body, circulating ash drain cooler, slag cooler, lime-ash induction system and pressure fan; Wherein, bone coal preparation and coal supply system link to each other with circulating fluid bed boiler body respectively with pressure fan, are used for delivering coal in circulating fluid bed boiler body and blowing; Circulating ash drain cooler and slag cooler are connected to the bottom of circulating fluid bed boiler body, and the circulating ash drain cooler also links to each other with the lime-ash induction system with slag cooler.
Described circulating fluid bed boiler body is provided with a plurality of coal feeding holes, and described a plurality of coal feeding holes are arranged on front wall, back wall and both walls, or on the combination in twos arbitrarily between the four sides wall.
The water wall surface of described circulating fluid bed boiler body is provided with shoe, and described shoe comprises ridge portion that is fixed on the water wall surface and the material feeding of watering that covers on the described ridge portion.
Described shoe forms multiple-rank arrangement along arranging at interval on the short transverse of water wall surface.
Described circulating ash drain cooler comprise ash inlet and ash hole, described ash inlet and ash hole are arranged at the two ends of circulating ash drain cooler respectively; The inside of described circulating ash drain cooler also is provided with snakelike heat-exchange tube, and the two ends of heat-exchange tube are respectively cooling medium inlet and cooling medium outlet.
Described slag cooler is a spent-bed cooler, comprises inlet of cold air and cold-air vent, and described inlet of cold air and cold-air vent are arranged at the two ends of slag cooler respectively; Inside at slag cooler also is provided with heat-exchange tube, and the two ends of heat-exchange tube are main feed-water inlet and the main water out of giving, and perhaps are the outlet of condensate water import and condensate water.
Described circulating ash drain cooler links to each other with the lime-ash induction system by slag cooler.
The utility model also has following advantage:
(1) compare with conventional ature of coal, because the calorific value of bone coal is very low, the boiler fired coal amount under the same load will rise significantly.And the coal feeding hole of existing low capacity CFB boiler is usually only on the perpend wall of boiler, the coal supply point of jumbo CFB boiler just the while on the relative wall in the two sides of boiler.Because the significantly increase of coal-supplying amount the utility model proposes and can on the multiaspect wall of boiler coal feeding hole be set simultaneously simultaneously, the flexibility that the coal supply system of increase is arranged;
(2) owing to bone coal ash height, the ash concentration during burning in the burner hearth is higher, and boiler furnace of the present utility model is provided with shoe, has reduced the wearing and tearing of burner hearth internal heating surface significantly, has improved the reliability and the availability of boiler;
(3) because the ash height of bone coal, when normally moving in the burner hearth and the ash amount in the main circulation loop will significantly increase.The utility model has increased circulating ash discharging and cooling device in the boiler main circulation loop, circulating ash can discharged by this equipment, reduces the ash concentration in burner hearth and the back-end ductwork significantly, alleviates heating surface wear and reduces the boiler accessory machinery power consumption;
(4) because the ash amount of bone coal is big, the bed drain purge of the cooling that needs, the corresponding increase of needs of slag cooler cooling medium amount.The cooling medium of conventional CFB boiler slag-cooling device is usually from the condensate water and the cold air of unit.Because the quantity of slag significantly increases, the condensate water water yield is less relatively.The cooling medium of the utility model slag cooler has increased boiler master feedwater.The slag cooler cooling water can also adopt the condensate water of unit separately separately from boiler master feedwater, can also be the combination of boiler master feedwater and unit condensate water.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of the circulating fluidized bed boiler systems of the utility model burning bone coal;
Fig. 2 arranges schematic diagram for the CFBB coal feeding hole;
Fig. 3 is the schematic diagram of shoe;
Fig. 4 is the structural representation of circulating ash drain cooler;
Fig. 5 is the schematic diagram of slag cooler;
Fig. 6 is the schematic diagram of another embodiment of the circulating fluidized bed boiler systems of the utility model burning bone coal.
The specific embodiment
Below in conjunction with accompanying drawing preferred implementation of the present utility model is elaborated.
With reference to shown in Figure 1, be the schematic diagram of an embodiment of the circulating fluidized bed boiler systems of the utility model burning bone coal.By this figure as can be seen, the circulating fluidized bed boiler systems of the utility model burning bone coal mainly comprises bone coal preparation and coal supply system 1, CFB (recirculating fluidized bed) boiler body 2, circulating ash drain cooler 3, slag cooler 4, lime-ash induction system 5 and pressure fan 6.Wherein, bone coal preparation and coal supply system 1 link to each other with CFB boiler body 2 respectively with pressure fan 6, are used for delivering coal and blowing in CFB boiler body 2.Circulating ash drain cooler 3 and slag cooler 4 are connected to the bottom of CFB boiler body 2, and circulating ash drain cooler 3 also links to each other with lime-ash induction system 5 respectively with slag cooler 4.
In order to increase coal-supplying amount, the coal feeding hole of CFB boiler body of the present utility model is a plurality of, and as shown in Figure 2, coal feeding hole 20 can be located at front wall, back wall and the both walls of boiler body, or on the combination in twos arbitrarily between the four sides wall.
High in-furnace dust concentration is to the wearing and tearing of water wall surface when using bone coal, also be provided with shoe 21 on the water wall surface of the burner hearth of the circulating fluid bed boiler body 2 of native system, concrete structure is as shown in Figure 3: water wall surface is provided with ridge portion, cover the top-pour material feeding again on ridge portion, above-mentioned ridge portion can adopt pin etc. to be welded on the water-supply-pipe of water wall surface and form.Preferably, above-mentioned shoe forms multiple-rank arrangement along arranging at interval on the short transverse of water wall surface.And, being further to reduce heating surface wear, the burner hearth of this circulating fluid bed boiler body 2 adopts lower design void tower cigarette speed (4.0～4.8m/s), and conventional CFB boiler furnace design void tower cigarette speed is more than the 5m/s, can cause the heavy wear of heating surface.
The effect of circulating ash drain cooler 3 is to reduce the in-furnace dust concentration level, and circulating ash is discharged main circulation loop, avoids the problem of bringing because of the in-furnace dust excessive concentration.The interface of circulating ash drain cooler 3 can be located at standpipe, the material returning device of boiler separator, on refeed line and the external heat exchanger.The concrete structure of circulating ash drain cooler 3 is as shown in Figure 4: comprise ash inlet 31 and ash hole 32, ash inlet 31 and ash hole 32 are arranged at the two ends of circulating ash drain cooler 3 respectively.Inside in circulating ash drain cooler 3 also is provided with snakelike heat-exchange tube, and the two ends of heat-exchange tube are respectively cooling medium inlet 33 and cooling medium outlet 34.
In the utility model, slag cooler 4 adopts spent-bed cooler, cooling medium adopts empty G﹠W to unite cooling, and cooling water source proposes to adopt the condensate water of CFB boiler unit and the main feedwater of CFB boiler to make up as cooling water first, thereby guarantees the cooling effect to the big quantity of slag.The structure of above-mentioned slag cooler 4 is as shown in Figure 5: comprise inlet of cold air 41, cold-air vent 42, inlet of cold air 41 and cold-air vent 42 are arranged at the two ends of slag cooler 4 respectively.Inside at slag cooler 4 also is provided with heat-exchange tube, and the cooling water in the heat-exchange tube can adopt the feedwater from the boiler master separately, can also adopt the condensate water of unit separately, can also be the combination of boiler master feedwater and unit condensate water.Therefore, the two ends of heat-exchange tube are main feed-water inlet 43 and the main water out 44 of giving, and perhaps are condensate water import 45 and condensate water outlet 46.
With reference to shown in Figure 6, be the schematic diagram of another embodiment of the circulating fluidized bed boiler systems of the utility model burning bone coal.By this figure as can be seen, circulating fluidized bed boiler systems among this embodiment is identical with system among first embodiment, also comprises bone coal preparation and coal supply system 1, CFB (recirculating fluidized bed) boiler body 2, circulating ash drain cooler 3, slag cooler 4, lime-ash induction system 5 and pressure fan 6.Difference is that in first embodiment, circulating ash drain cooler 3 links to each other with lime-ash induction system 5 respectively with slag cooler 4, and the circulating ash of process circulating ash drain cooler 3 directly enters lime-ash induction system 5; And in this embodiment, circulating ash drain cooler 3 links to each other with slag cooler 4, after the circulating ash of process circulating ash drain cooler 3 enters slag cooler 4 like this, enters lime-ash induction system 5 again.
Need to prove; the above only is preferred embodiment of the present utility model; rather than to the qualification of technical solutions of the utility model, any the utility model technical characterictic being equal to of being done replaced or corresponding improvement, still within protection domain of the present utility model.
Claims (7)
1. the circulating fluidized bed boiler systems of the bone coal that burns, it is characterized in that, comprise bone coal preparation and coal supply system (1), circulating fluid bed boiler body (2), circulating ash drain cooler (3), slag cooler (4), lime-ash induction system (5) and pressure fan (6); Wherein, bone coal preparation and coal supply system (1) link to each other with circulating fluid bed boiler body (2) respectively with pressure fan (6), deliver coal and blow in circulating fluid bed boiler body (2); Circulating ash drain cooler (3) and slag cooler (4) are connected to the bottom of circulating fluid bed boiler body (2), and circulating ash drain cooler (3) also links to each other with lime-ash induction system (5) with slag cooler (4).
2. the circulating fluidized bed boiler systems of burning bone coal according to claim 1, it is characterized in that, described circulating fluid bed boiler body (2) is provided with a plurality of coal feeding holes (20), described a plurality of coal feeding hole (20) is arranged on front wall, back wall and both walls, or on the combination in twos arbitrarily between the four sides wall.
3. the circulating fluidized bed boiler systems of burning bone coal according to claim 1, it is characterized in that, the water wall surface of described circulating fluid bed boiler body (2) is provided with shoe (21), and described shoe (21) comprises ridge portion that is fixed on the water wall surface and the material feeding of watering that covers on the described ridge portion.
4. the circulating fluidized bed boiler systems of burning bone coal according to claim 3 is characterized in that, described shoe (21) forms multiple-rank arrangement along arranging at interval on the short transverse of water wall surface.
5. the circulating fluidized bed boiler systems of burning bone coal according to claim 4, it is characterized in that, described circulating ash drain cooler (3) comprise ash inlet (31) and ash hole (32), described ash inlet (31) and ash hole (32) are arranged at the two ends of circulating ash drain cooler (3) respectively; The inside of described circulating ash drain cooler (3) also is provided with snakelike heat-exchange tube, and the two ends of heat-exchange tube are respectively cooling medium inlet (33) and cooling medium outlet (34).
6. the circulating fluidized bed boiler systems of burning bone coal according to claim 5, it is characterized in that, described slag cooler (4) is a spent-bed cooler, comprise inlet of cold air (41) and cold-air vent (42), described inlet of cold air (41) and cold-air vent (42) are arranged at the two ends of slag cooler (4) respectively; Inside at slag cooler (4) also is provided with heat-exchange tube, and the two ends of heat-exchange tube are main feed-water inlet (43) and the main water out (44) of giving, and perhaps are condensate water import (45) and condensate water outlet (46).
7. the circulating fluidized bed boiler systems of burning bone coal according to claim 1 is characterized in that, described circulating ash drain cooler (3) links to each other with lime-ash induction system (5) by slag cooler (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205961638U CN201897215U (en) | 2010-11-08 | 2010-11-08 | Circulating fluidized bed boiler system capable of burning stone coal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205961638U CN201897215U (en) | 2010-11-08 | 2010-11-08 | Circulating fluidized bed boiler system capable of burning stone coal |
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| CN201897215U true CN201897215U (en) | 2011-07-13 |
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| CN2010205961638U Expired - Fee Related CN201897215U (en) | 2010-11-08 | 2010-11-08 | Circulating fluidized bed boiler system capable of burning stone coal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264996A (en) * | 2013-04-28 | 2013-08-28 | 中国华能集团清洁能源技术研究院有限公司 | Circulating fluidized bed boiler system for extraction of selenium from bone coal |
| CN103900076A (en) * | 2014-03-24 | 2014-07-02 | 中国华能集团清洁能源技术研究院有限公司 | Ultralow-emission power generation system using low-calorific-value fuel for combustion |
| CN109708105A (en) * | 2018-12-29 | 2019-05-03 | 中国能源建设集团广东省电力设计研究院有限公司 | The novel recovery system of circulating fluid bed boiler slag heat and its control method |
-
2010
- 2010-11-08 CN CN2010205961638U patent/CN201897215U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264996A (en) * | 2013-04-28 | 2013-08-28 | 中国华能集团清洁能源技术研究院有限公司 | Circulating fluidized bed boiler system for extraction of selenium from bone coal |
| CN103264996B (en) * | 2013-04-28 | 2014-10-29 | 中国华能集团清洁能源技术研究院有限公司 | Circulating fluidized bed boiler system for extraction of selenium from bone coal |
| CN103900076A (en) * | 2014-03-24 | 2014-07-02 | 中国华能集团清洁能源技术研究院有限公司 | Ultralow-emission power generation system using low-calorific-value fuel for combustion |
| CN109708105A (en) * | 2018-12-29 | 2019-05-03 | 中国能源建设集团广东省电力设计研究院有限公司 | The novel recovery system of circulating fluid bed boiler slag heat and its control method |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20181108 |