CN213746753U - Circulating fluidized bed boiler system for burning waste blades - Google Patents
Circulating fluidized bed boiler system for burning waste blades Download PDFInfo
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- CN213746753U CN213746753U CN202022690680.8U CN202022690680U CN213746753U CN 213746753 U CN213746753 U CN 213746753U CN 202022690680 U CN202022690680 U CN 202022690680U CN 213746753 U CN213746753 U CN 213746753U
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Abstract
The utility model discloses a burn circulating fluidized bed boiler system of old and useless blade belongs to fluidized bed boiler technical field. A secondary air port of the circulating fluidized bed boiler is connected with a secondary fan through a secondary air pipeline; the crushing device is connected with the iron removal device, the iron removal device is connected with the conveying device, the conveying device is connected with the crushing device, the crushing device is connected with the secondary air pipeline through a conveying pipeline, and a first induced draft fan is arranged on the conveying pipeline; the flue gas outlet of the circulating fluidized bed boiler is connected with the inlet of the cyclone separator through the horizontal flue, and the upper end outlet of the cyclone separator is connected with a flue gas tail gas treatment system; the bottom outlet of the cyclone separator is connected with a material returning system through a vertical pipe, and the material returning system is connected with a material returning inlet of the circulating fluidized bed boiler. The system has reasonable structure, changes little to the original CFB boiler system, makes full use of the heat value of the waste blade, and realizes the centralized, harmless and resource treatment of the waste blade.
Description
Technical Field
The utility model belongs to the technical field of fluidized bed boiler, concretely relates to burn circulating fluidized bed boiler system of old and useless blade.
Background
In recent years, the wind power industry keeps the characteristic of continuous and rapid development. From another perspective, the comprehensive disposal of waste leaves is of concern. As the service life of the fan is 20 years, from this year, the fan which gradually reaches the quality guarantee period is inevitably eliminated or modified to improve the quality and efficiency (such as blade replacement and the like), a large amount of eliminated blades are generated, broken blades appear in the operation of the fan, and production corner wastes (such as demoulding cloth, a flow guide net, a vacuum film and the like) of blade enterprises are also generated to jointly form waste blades (generally called) which need comprehensive environment-friendly disposal.
The increase in unit capacity also drives the enlargement of the blades, with a consequent significant increase in blade weight. In the case of prior wind turbines, the weight of the waste blades produced by a single wind turbine is not negligible. For example, the total weight of the blades of a 2MW 3-blade fan is up to 7-8 tons. Nearly 5 million tons of waste leaves will be expected to be produced in 2020, and up to 20 million tons will be expected in 2034.
In terms of materials, the fan blade is still mainly made of composite materials such as fiber reinforced materials (such as glass fibers and carbon fibers), plastic polymers (such as polyester and epoxy vinyl resin), sandwich materials (such as PVC, PET or balsa), coatings (such as polyurethane) and the like, and traditional materials (such as alloy steel, aluminum alloy and the like) are not used any more. As the main material of the fan blade, the composite material accounts for more than 90 percent of the weight of the blade. Because the proportion of the composite materials is large, the method is the optimal mode for separating and recycling each composite material from the perspective of recycling raw materials. However, large scale blade material recovery techniques are not yet mature at present and do not adequately separate the fibers from the polymer resin. In addition, because the length of the blade is relatively large, the industry mainly uses an adhesive mode to connect the sectional type blades, 50 to 300 kilograms of adhesive (such as epoxy adhesive, polyurethane adhesive and the like) is used for producing each blade, the separation difficulty is increased due to the use of the adhesive, and the method becomes a key for preventing the large-scale recycling of the fan blade. The appearance of large quantities of waste leaves every year will put a great strain on the environment if not properly disposed of in terms of the quantity and material composition of the waste leaves.
In fact, whether the fiber or resin composite material or the organic viscose glue has the overall combustible performance, the waste blades are regarded as combustible waste to be subjected to combustion treatment, and the method is an effective means for effectively disposing the waste blade stacking, relieving or even eliminating the environmental protection pressure before the high-efficiency and low-cost blade material separation technology is applied on a large scale. In germany, incinerators have been built which are used exclusively for incinerating waste blades. From the economical point of view, although the total amount of the waste blades is huge, the waste blades are distributed all over the world, and the possibility that the incinerator is specially designed and built for intensively incinerating and disposing all the waste blades in China can be eliminated from the aspects of transportation cost and the like.
Disclosure of Invention
In order to solve the defect that exists among the above-mentioned prior art, the utility model aims to provide an burn circulating fluidized bed boiler system of old and useless blade, system architecture is reasonable, and it is little to original CFB boiler system change, make full use of the calorific value of old and useless blade, realized the concentration of old and useless blade, innoxious and resourceful treatment.
The utility model discloses a following technical scheme realizes:
the utility model discloses a circulating fluidized bed boiler system for incinerating waste blades, which comprises a crushing device, an iron removal device, a conveying device, a crushing device, a first draught fan, an overfire fan, a circulating fluidized bed boiler, a cyclone separator, a material returning system and a flue gas tail gas treatment system;
a secondary air port of the circulating fluidized bed boiler is connected with a secondary fan through a secondary air pipeline; the crushing device is connected with the iron removal device, the iron removal device is connected with the conveying device, the conveying device is connected with the crushing device, the crushing device is connected with the secondary air pipeline through a conveying pipeline, and a first induced draft fan is arranged on the conveying pipeline; the flue gas outlet of the circulating fluidized bed boiler is connected with the inlet of the cyclone separator through the horizontal flue, and the upper end outlet of the cyclone separator is connected with a flue gas tail gas treatment system; the bottom outlet of the cyclone separator is connected with a material returning system through a vertical pipe, and the material returning system is connected with a material returning inlet of the circulating fluidized bed boiler.
Preferably, the flue gas and tail gas treatment system comprises a tail flue, a dust remover, a desulfurizing tower, a second induced draft fan and a chimney which are connected in sequence; an economizer and an air preheater are arranged in the tail flue.
Further preferably, the dust remover is a bag-type dust remover.
Preferably, the size of the waste blade entering the crushing device is 2-3 m.
Preferably, the size of the waste blade particles obtained by the treatment of the crushing device is 2-5 cm.
Preferably, the average particle size of the powder of the waste and old blades obtained by the treatment of the crushing device is 3-5 mm.
Preferably, the pipe diameter of the conveying pipeline between the crushing device and the secondary air pipeline is 200-400 mm.
Compared with the prior art, the utility model discloses following profitable technological effect has:
almost every city has Circulating Fluidized Bed (CFB) boilers of different capacity of quantity inequality, utilize CFB boiler combustion temperature low, fuel adaptability is wide, pollutant emission level low grade characteristic, burn the processing to old and useless blade, utilize calorific value of combustible material in the blade, non-combustible material such as glass fiber, etc. turn into the lime-ash in the high-temperature environment of furnace, because mix the fan blade proportion of burning, the glass fiber, etc. has limited influence to the quality of ash or sediment, do not influence the downstream comprehensive utilization of lime-ash, and burn the flue gas that processing blade produced and the flue gas of coal can utilize the flue gas pollutant removal device that the boiler was equipped with together to realize the discharge to reach standard, it is the harmless processing mode of a high-efficient feasible old and useless blade.
The utility model discloses a burn circulating fluidized bed boiler system of old and useless blade, with the help of CFB boiler system, realized the resourceization and the innoxious comprehensive utilization of old and useless blade. The waste blade primary crushing, deep crushing and pneumatic conveying system is designed, the waste blade primary crushing, deep crushing and pneumatic conveying system is used for feeding the waste blade secondary crushing, deep crushing and pneumatic conveying system into a hearth through a secondary air port of a CFB boiler to burn and dispose, and the waste blade primary crushing, deep crushing and pneumatic conveying system is combined with an inherent tail gas treatment system of the CFB boiler to burn and dispose the standard-reaching emission of flue gas. The heat value of the organic material of the waste blades is fully utilized, the smoke is discharged up to the standard by utilizing the environmental protection equipment of the CFB boiler, the fly ash or bottom slag is formed by the glass fiber, and the concentrated, harmless and resource treatment of the waste blades is realized. The system can effectively treat eliminated blades, broken blades and blade production leftover materials of blade enterprises in a larger range of nearby CFB boiler power plants, and fully utilize the fuel property of blade materials. Before the comprehensive recycling technology of the blade material is mature and utilized in a large scale, the method is an ideal and effective alternative scheme, is particularly suitable for the conditions of small distance from a CFB boiler power plant, high cost in long-distance transportation and the like, and can obtain remarkable environmental protection and social benefits.
Further, the system utilizes the mature flue gas desulfurization, denitration and dust pelletizing system of CFB boiler, realizes burning the emission up to standard of handling the flue gas, realizes innocent treatment.
Furthermore, the bag-type dust collector is adopted, so that the dust collection efficiency is high.
Furthermore, the size of the waste blades entering the crushing device is 2-3 m, so that on one hand, the waste blades are convenient to transport before, and on the other hand, the waste blades are convenient to crush by the crushing device.
Furthermore, the size of the waste blade particles obtained by the crushing device is 2-5 cm, so that the system conveying and the subsequent crushing treatment are facilitated, and the system efficiency is comprehensively improved.
Furthermore, the average particle size of the waste blade powder obtained by the crushing device is 3-5 mm, so that pneumatic transmission is facilitated, and the waste blade powder can be fully combusted in a hearth.
Furthermore, because the blending burning proportion of the waste blade powder is small, the conveying pipeline between the crushing device and the secondary air pipeline can realize the efficient conveying of the waste blade powder by adopting the pipe diameter of about 200-400 mm, the diameter of the pipeline is specifically determined by combining the conveying air speed and the waste blade treatment capacity, and the equipment investment can be reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the circulating fluidized bed boiler system for burning waste blades of the present invention.
In the figure: 1 is a crushing device; 2 is an iron removing device; 3 is a conveying device; 4, a crushing device; 5 is a first induced draft fan; 6 is a secondary air pipeline; 7 is a secondary fan; 8 is a circulating fluidized bed boiler; 9 is a horizontal flue; 10 is a cyclone separator; 11 is a vertical pipe; 12 is a material returning system; 13 is a tail flue; 14 is an economizer; 15 is an air preheater; 16 is a dust remover; 17 is a desulfurizing tower; 18 is a second induced draft fan; and 19 is a chimney.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
referring to fig. 1, in the circulating fluidized bed boiler system for incinerating waste blades of the present invention, a secondary air port of a circulating fluidized bed boiler 8 is connected to a secondary air fan 7 through a secondary air duct 6; the crushing device 1 is connected with the iron removal device 2, the iron removal device 2 is connected with the conveying device 3, the conveying device 3 is connected with the crushing device 4, the crushing device 4 is connected with the secondary air pipeline 6 through a conveying pipeline, and a first induced draft fan 5 is arranged on the conveying pipeline; a flue gas outlet of the circulating fluidized bed boiler 8 is connected with an inlet of a cyclone separator 10 through a horizontal flue 9, and an outlet at the upper end of the cyclone separator 10 is sequentially connected with a tail flue 13, a dust remover 16, a desulfurizing tower 17, a second induced draft fan 18 and a chimney 19; an economizer 14 and an air preheater 15 are arranged in the tail flue 13. The bottom outlet of the cyclone separator 10 is connected with a material returning system 12 through a vertical pipe 11, and the material returning system 12 is connected with the material returning inlet of the circulating fluidized bed boiler 8.
Preferably, the conveying device 3 employs a belt conveyor; the dust remover 16 adopts a bag-type dust remover;
after the waste blades are collected from the wind power plant and the blade enterprise in a centralized mode, the waste blades are subjected to primary treatment (such as being divided into sections 2-3 meters long) so as to be convenient to transport, and the sections are transported to the open place of the circulating fluidized bed boiler power plant for temporary storage. When needs burn and handle, carry the segment form blade and send into breaker 1, through the mechanical structure of mutual interlock cutting in breaker 1, tentatively break into the cubic raw materials that average length is 2 ~ 5cm, cubic raw materials falls into deironing device 2 in the low reaches after the export of breaker 1 is discharged, utilizes and establishes electromagnetic adsorption system in to adsorb the metalwork (like small-size bolt etc.) in the broken raw materials. A belt conveyor with a certain angle is arranged below the outlet of the iron removal device 2, the blocky raw materials are lifted to the inlet of the crushing device 4, and the crushing device 4 further crushes the blocky raw materials into powder with the average particle size of 3-5 mm, and the powder can be directly fed into a furnace to participate in incineration.
The connection crushing device 4 and the first small induced draft fan 5 are connected through a pipeline with a certain diameter (such as DN 200-400 mm), the air speed in the pipeline is 20-25 m/s, the blade powder can be smoothly wrapped, and the full-force conveying is realized.
The downstream of the first induced draft fan 5 is directly connected with the secondary air pipeline 6, and the blade powder enters the hearth of the circulating fluidized bed boiler 8 through the secondary air inlet arranged on the wall surface of the hearth through the secondary air pipeline 6.
In the environment of high temperature (850-980 ℃) and oxygen (the excess air coefficient of the boiler is 1.10-1.25) in the hearth of the circulating fluidized bed boiler 8, the organic materials of the blade powder are quickly heated and ignited to burn, and the glass fiber and the like are melted into fine particles in the collision environment of high temperature and high particle concentration to form fly ash or bottom slag.
In the central airflow environment from bottom to top in the CFB boiler furnace, burning blade powder is carried upwards by flue gas and enters the cyclone separator 10 through the horizontal flue 9, and in the cyclone separator 10, larger particles fall into the vertical pipe 11 at the bottom through circumferential rotation and collision, and return to the furnace through the material returning system 12 to continue burning. This process is repeated several times, and after the organic material in the vane powder has been fully combusted, the remaining fine particles, which contain mainly glass fibers, are carried by the flue gas away from the cyclone 10 and into the tail flue 13.
Because the mixing combustion proportion of the blades is small, a large amount of flue gas generated by burning coal mainly completes heat exchange in the tail flue 13 through a superheater, a reheater, an economizer 14, an air preheater 15 and the like. The flue gas after heat exchange enters the dust collector 16 from the downstream of the air preheater 15, and the glass fiber particles and other conventional fly ash particles are fully captured in the dust collector 16. The collected fly ash is discharged by the dust collector 16 and can be used in downstream, such as building materials.
The flue gas from which the fly ash is removed enters a downstream desulfurizing tower 17, and SO in the flue gas is removed under the action of limestone and the like2. The flue gas denitration of the CFB boiler generally adopts an SNCR denitration method, a spray gun is arranged on the wall surface of a horizontal flue 9, and reducing agent solutions such as urea or ammonia water are sprayed to further remove NOx in the flue gas. And after the flue gas subjected to dust removal, desulfurization and denitration meets the emission standard of atmospheric pollutants, the flue gas is discharged into the atmosphere through a chimney 19 under the action of a second induced draft fan 18 of the CFB boiler.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made by the system described in the present invention are all included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.
Claims (7)
1. A circulating fluidized bed boiler system for incinerating waste blades is characterized by comprising a crushing device (1), an iron removal device (2), a conveying device (3), a crushing device (4), a first induced draft fan (5), a secondary air fan (7), a circulating fluidized bed boiler (8), a cyclone separator (10), a material returning system (12) and a flue gas tail gas treatment system;
a secondary air port of the circulating fluidized bed boiler (8) is connected with a secondary air fan (7) through a secondary air pipeline (6); the crushing device (1) is connected with the iron removal device (2), the iron removal device (2) is connected with the conveying device (3), the conveying device (3) is connected with the crushing device (4), the crushing device (4) is connected with the secondary air pipeline (6) through a conveying pipeline, and a first induced draft fan (5) is arranged on the conveying pipeline; a flue gas outlet of the circulating fluidized bed boiler (8) is connected with an inlet of a cyclone separator (10) through a horizontal flue (9), and an outlet at the upper end of the cyclone separator (10) is connected with a flue gas tail gas treatment system; the bottom outlet of the cyclone separator (10) is connected with a material returning system (12) through a vertical pipe (11), and the material returning system (12) is connected with a material returning inlet of the circulating fluidized bed boiler (8).
2. The circulating fluidized bed boiler system for incinerating waste blades according to claim 1, wherein the flue gas and tail gas treatment system comprises a tail flue (13), a dust remover (16), a desulfurizing tower (17), a second induced draft fan (18) and a chimney (19) which are connected in sequence; an economizer (14) and an air preheater (15) are arranged in the tail flue (13).
3. A circulating fluidized bed boiler system for incinerating waste blades according to claim 2, characterized in that the dust separator (16) is a bag-type dust separator.
4. The circulating fluidized bed boiler system for incinerating waste blades as claimed in claim 1, wherein the size of the waste blades entering the crushing device (1) is 2-3 m.
5. The circulating fluidized bed boiler system for incinerating waste blades according to claim 1, wherein the size of the waste blade particles obtained by the treatment of the crushing device (1) is 2-5 cm.
6. The circulating fluidized bed boiler system for incinerating waste blades as set forth in claim 1, wherein the average particle size of the powder of the waste blades obtained by the treatment of the pulverizing device (4) is 3 to 5 mm.
7. The circulating fluidized bed boiler system for incinerating waste blades according to claim 1, wherein the pipe diameter of the conveying pipeline connecting the crushing device (4) and the secondary air pipeline (6) is 200-400 mm.
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| CN202022690680.8U CN213746753U (en) | 2020-11-19 | 2020-11-19 | Circulating fluidized bed boiler system for burning waste blades |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815284A (en) * | 2021-11-04 | 2023-03-21 | 北京工商大学 | Device system and method for resource utilization of waste wind power blades |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115815284A (en) * | 2021-11-04 | 2023-03-21 | 北京工商大学 | Device system and method for resource utilization of waste wind power blades |
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