CN110285400B - Pure fuel oil shale CFB boiler - Google Patents

Pure fuel oil shale CFB boiler Download PDF

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Publication number
CN110285400B
CN110285400B CN201910571604.4A CN201910571604A CN110285400B CN 110285400 B CN110285400 B CN 110285400B CN 201910571604 A CN201910571604 A CN 201910571604A CN 110285400 B CN110285400 B CN 110285400B
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China
Prior art keywords
cylinder
hearth
oil shale
shale
separator
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CN201910571604.4A
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Chinese (zh)
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CN110285400A (en
Inventor
韩大彬
丁乾彬
李小龙
任亚萍
康钦福
胡柳英
刘训志
钟思梅
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China Western Power Industrial Co Ltd
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China Western Power Industrial Co Ltd
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Priority to CN201910571604.4A priority Critical patent/CN110285400B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0069Systems therefor

Abstract

The invention relates to the field of boilers, and aims to solve the problem that the existing boiler can not be well adapted to small-particle oil shale and the problem that semi-coke, a byproduct after the dry distillation of the oil shale, is used as fuel, and provides a pure oil shale CFB boiler, which comprises a hearth, an ignition device, a separator, a tail vertical shaft flue and a feeding device, and is characterized in that: the pure oil shale CFB boiler takes small-particle shale and/or shale semicoke which is a byproduct after oil shale dry distillation as fuel; the upper part of the side surface of the hearth is communicated with the upper part of the side surface of the separator through a connecting cylinder; the tail vertical shaft flue is communicated with the upper part of the separator through an L-shaped pipe; the L-shaped pipe comprises a transverse pipe and a central cylinder which are communicated with each other; the central cylinder is inserted into a separation cavity of the separator from top to bottom; and, the inlet of the center cylinder is positioned higher than the lower end of the connection cylinder. The invention has the advantages of greatly realizing the recovery of combustible fly ash and slowing down the speed of blocking the channel by bonding the fly ash.

Description

Pure fuel oil shale CFB boiler
Technical Field
The invention relates to the field of boilers, in particular to a pure fuel oil shale CFB boiler.
Background
The oil shale is a solid combustible organic ore body with high ash content and low calorific value, is in a black or brown sheet shape with fine texture, and can be subjected to low-temperature dry distillation to obtain shale oil similar to natural petroleum. From the perspective of reserves and utility value, oil shale is an important alternative energy source with a great development prospect.
The existing boiler can not be well adapted to the use of oil shale with small particles (such as less than 12 mm) and the use of semicoke which is a byproduct after the dry distillation of the oil shale as fuel.
Disclosure of Invention
The invention aims to provide a pure oil shale CFB boiler to solve the problem that the existing boiler can not be well adapted to oil shale with small particles (such as less than 12 mm) and semicoke which is a byproduct after oil shale is retorted is used as fuel.
The embodiment of the invention is realized by the following steps:
the utility model provides a pure fuel shale CFB boiler, its includes furnace, ignition, separator, afterbody shaft flue and feeder, its characterized in that: the pure oil shale CFB boiler takes small-particle shale and/or shale semicoke which is a byproduct after oil shale dry distillation as fuel; the upper part of the side surface of the hearth is communicated with the upper part of the side surface of the separator through a connecting cylinder; the tail vertical shaft flue is communicated with the upper part of the separator through an L-shaped pipe; the L-shaped pipe comprises a transverse pipe and a central cylinder which are communicated with each other; the central cylinder is inserted into a separation cavity of the separator from top to bottom; and, the inlet of the center cylinder is positioned higher than the lower end of the connection cylinder.
Optionally: the section of the hearth is of a rectangular structure with the length of 9500mm and the width of 4750 mm.
Optionally: a screen type heating surface is arranged in the hearth; the screen type heating surface is three screen type superheaters, two of the screen type superheaters are parallel to the short side of the hearth, the other screen type superheaters are parallel to the long side of the hearth, and the three are distributed at intervals in a delta shape.
Optionally: the lower part of the hearth is a tapered section which is gradually reduced, and the dense phase zone height of the tapered section is at least 12 m. The arrangement can increase the heat storage capacity of the boiler, keep the distribution of the temperature field of the hearth and ensure the normal combustion of special fuel.
Optionally: the hearth is at least provided with two feeding ports which are mutually spaced in the height direction of the hearth; the feeding device is communicated with the feeding port and supplies materials to the hearth through the feeding port. The multipoint feeding can ensure that the small-particle shale and/or the shale semicoke which is the byproduct after the dry distillation of the oil shale can be stably combusted in the boiler as fuel.
Optionally: the ignition device is connected to the lower opening of the conical section of the hearth and is used for ignition; and a plurality of low-temperature superheaters, high-temperature superheaters, coal economizers and air preheaters are sequentially arranged in the tail vertical shaft flue.
Optionally: the separator comprises a cylindrical middle cylinder section; the side wall of the middle cylinder section is provided with a connecting hole for communicating the hearth; a conical lower cylinder section with the diameter gradually reduced is connected below the middle cylinder section; the lower part of the lower cylinder section is communicated to a hearth through a material returning device and used for returning materials; the upper end of the middle cylinder section is communicated with the upper cylinder section; the upper cylinder section is a cylindrical structure with the diameter smaller than that of the middle cylinder section; the central cylinder penetrates through the upper cylinder section and enters the middle cylinder section from top to bottom, and the opening position of the central cylinder is positioned above the central axis of the connecting hole.
The applicant has noticed that when small particle shale and/or shale semicoke, which is a by-product of retorting oil shale, is used as fuel, the fuel has a very large amount of fly ash in the products after combustion in the furnace, and more large ash lumps are formed. Due to the action of gravity, the larger ash lumps enter the separator from the lower part of the connecting hole, and due to the higher position of the central cylinder, the ash lumps of the parts do not contact and adhere to the wall of the central cylinder but directly descend into the material returning device for material returning and recycling, while the smaller ash lumps existing in the lower part of the connecting hole can fully fall into the material returning device after being blocked and decelerated by the cylinder wall of the central cylinder. Therefore, the arrangement mode of the central cylinder in the embodiment is very favorable for sedimentation with ash lumps and cannot cause the problem that the ash lumps adhered to the outer wall of the central cylinder too fast cause channel blockage. Furthermore, an annular cavity is defined between the part of the central cylinder extending into the middle cylinder section and the middle cylinder section, a gap for communicating the annular cavity with the interior of the central cylinder is arranged at the part of the central cylinder extending into the middle cylinder section, which is back to the connecting hole, and the section of the part of the central cylinder extending into the middle cylinder section is in an incomplete annular shape due to the gap. The part of the central cylinder extending into the middle cylinder section is provided with the notch at the part back to the connecting hole, so that the ash mass at the higher part of the position is blocked by the front wall and is still prevented from falling down due to insufficient gravity, and the ash mass can smoothly enter the central cylinder from the notch and is further discharged outwards through the tail shaft flue, and the ash mass cannot be excessively adhered to the surface of the annular cavity to form channel blockage.
In summary, the pure oil shale CFB boiler in this embodiment can recover or release the combustion fly ash of the shale semi-coke fuel, which is a byproduct after the dry distillation of the small particle shale and/or the oil shale with extremely large fly ash content, in different layers according to the size due to the special arrangement, and can greatly recover the combustible fly ash and reduce the speed of blocking the passage by bonding the fly ash.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a front view of a pure oil shale CFB boiler in an embodiment of the present invention;
FIG. 2 is a horizontal view of a pure oil shale CFB boiler in an embodiment of the present invention;
FIG. 3 is a schematic view of the hidden support system of FIG. 1;
fig. 4 is a cross-sectional view of a portion of the central barrel extending into the middle barrel section.
Icon: 10-pure fuel shale CFB boiler; 11-a hearth; 16-an ignition device; 12-a separator; 13-tail shaft flue; 15-a feeding device; 40-a connecting cylinder; 46-L-shaped tubes; 44-cross tube; 45-a central cartridge; q1-separation chamber; k1-inlet; d1-lower end of connecting cylinder; 21-platen superheater; 22-a cone section; 23-a low temperature superheater; 24-high temperature superheater; 25-an economizer; 26-an air preheater; 41-middle cylinder section; k2-connection hole; 42-lower cylinder section; 14-a material returning device; 43-upper barrel section; l1-center axis; q2-ring cavity; k3-notch; s1-support system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, 2, 3 and 4, the present embodiment provides a pure oil shale CFB boiler 10 comprising a furnace 11, an ignition device 16, a separator 12, a tail shaft flue 13 and a feeding device 15. The pure oil shale CFB boiler 10 takes small-particle shale and/or shale semicoke which is a byproduct after oil shale dry distillation as fuel; the upper part of the side surface of the hearth 11 is communicated with the upper part of the side surface of the separator 12 through a connecting cylinder 40; the tail vertical shaft flue 13 is communicated with the upper part of the separator 12 through an L-shaped pipe 46; the L-shaped pipe 46 includes a cross pipe 44 and a center cylinder 45 communicating with each other; is inserted into the separation chamber Q1 of the separator 12 from the top downwards; also, the inlet K1 of the center cylinder 45 is positioned higher than the lower end of the connection cylinder 40.
Optionally, the hearth 11 has a rectangular section with a length of 9500mm and a width of 4750 mm. In this embodiment, a screen-type heating surface is arranged in the furnace 11; the screen type heating surface is three screen type superheaters 21, wherein two screen type superheaters 21 are parallel to the short side of the hearth 11, the other screen type superheaters are parallel to the long side of the hearth 11, and the three are distributed at intervals in a delta shape. The lower part of the furnace 11 is a tapered section 22 which is gradually reduced, and the dense phase area height of the tapered section 22 is at least 12 m. The arrangement can increase the heat storage capacity of the boiler, keep the distribution of the temperature field of the hearth 11 and ensure the normal combustion of special fuel. The hearth 11 is at least provided with two feeding ports which are mutually spaced in the height direction of the hearth 11; the feeding device 15 is connected to the feeding port and feeds the hearth 11 through the feeding port. The multipoint feeding can ensure that the small-particle shale and/or the shale semicoke which is the byproduct after the dry distillation of the oil shale can be stably combusted in the boiler as fuel. In this embodiment, the ignition device 16 is connected to the lower opening of the conical section 22 of the furnace 11 for ignition; and a plurality of low-temperature superheaters 23, high-temperature superheaters 24, coal economizers 25 and air preheaters 26 are sequentially arranged in the tail vertical shaft flue 13.
In the present embodiment, the separator 12 includes a cylindrical middle cylindrical section 41; the side wall of the middle cylinder section 41 is provided with a connecting hole K2 for communicating the hearth 11; a conical lower cylinder section 42 with gradually reduced diameter is connected below the middle cylinder section 41; the lower part of the lower cylinder section 42 is communicated to the hearth 11 through a material returning device 14 for returning materials; the upper end of the middle cylinder section 41 is communicated with an upper cylinder section 43; the upper barrel section 43 is a cylindrical structure with a diameter smaller than that of the middle barrel section 41; the center cylinder 45 passes through the upper cylinder section 43 from the top down and enters the middle cylinder section 41, and the opening position of the center cylinder 45 is located above the center axis L1 of the connecting hole K2. The applicant has noticed that when the small-particle shale and/or the shale semicoke which is the byproduct of the retorting of the oil shale is used as the fuel, the fly ash in the products of the combustion of the fuel in the furnace 11 is very much and forms larger ash masses more. Due to the gravity, the larger ash lumps enter the separator 12 from the lower part of the connecting hole K2, and due to the higher position of the central cylinder 45, the ash lumps of the larger part do not contact and stick on the wall of the central cylinder 45, but directly descend downwards into the reclaimer 14 for reclaiming, while the smaller ash lumps existing in the lower part of the connecting hole K2 can fall into the reclaimer 14 more fully after being decelerated by the blocking of the cylinder wall of the central cylinder 45. Thus, the central cylinder 45 of the present embodiment is disposed in a manner that is very advantageous for settling with ash lumps and does not cause the problem that the ash lumps too quickly adhered to the outer wall of the central cylinder 45 cause channel blockage. Further, an annular cavity Q2 is defined between the part of the central cylinder 45 extending into the middle cylinder section 41 and the middle cylinder section 41, the part of the central cylinder 45 extending into the middle cylinder section 41 is provided with a notch K3 communicating the annular cavity Q2 with the inside of the central cylinder 45 at the part back to the connecting hole K2, and the notch K3 ensures that the section of the part of the central cylinder 45 extending into the middle cylinder section 41 is in an incomplete circular ring shape. A gap K3 is formed in the part, back to the connecting hole K2, of the part, extending into the middle cylinder section 41, of the central cylinder 45, so that ash lumps at the higher part can smoothly enter the central cylinder 45 from the gap K3 after being blocked and decelerated by the front wall and a small amount of ash lumps which cannot fall down due to insufficient gravity and are further discharged outside through the tail vertical shaft flue 13, and the ash lumps are not excessively adhered to the surface of the annular cavity Q2 and are not turned into channel blockage.
Portions of the pure oil shale CFB boiler 10 in this embodiment are supported by a truss-like support system S1.
In summary, the pure oil shale CFB boiler 10 in the embodiment can recycle or release the combustion fly ash of the shale semi-coke fuel, which is a byproduct after the dry distillation of the small-particle shale and/or the extremely large amount of the fly ash after the combustion, according to the classification of the sizes due to the special arrangement thereof, and can greatly realize the recycling of the combustible fly ash and reduce the speed of blocking the passage by bonding the fly ash.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a pure fuel shale CFB boiler, includes furnace, ignition, separator, afterbody shaft flue and feeder, its characterized in that: the pure fuel oil shale CFB boiler takes small-particle shale and/or shale semicoke which is a byproduct after oil shale dry distillation as fuel;
the upper part of the side surface of the hearth is communicated with the upper part of the side surface of the separator through a connecting cylinder;
the tail vertical shaft flue is communicated with the upper part of the separator through an L-shaped pipe; the L-shaped pipe comprises a transverse pipe and a central cylinder which are communicated with each other; the central cylinder is inserted into a separation cavity of the separator from top to bottom; and, the inlet of the central cylinder is positioned higher than the lower end of the connecting cylinder;
the separator comprises a cylindrical middle barrel section; the side wall of the middle cylinder section is provided with a connecting hole for communicating the hearth;
a conical lower cylinder section with the diameter gradually reduced is connected below the middle cylinder section; the lower part of the lower cylinder section is communicated to a hearth through a material returning device and used for returning materials; the upper end of the middle cylinder section is communicated with the upper cylinder section; the upper cylinder section is a cylindrical structure with the diameter smaller than that of the middle cylinder section; the central cylinder penetrates through the upper cylinder section from top to bottom and enters the middle cylinder section, and the opening position of the central cylinder is positioned above the central axis of the connecting hole;
an annular cavity is defined between the part of the central cylinder extending into the middle cylinder section and the middle cylinder section, a gap communicating the annular cavity with the interior of the central cylinder is arranged on the part of the central cylinder extending into the middle cylinder section, which is back to the connecting hole, and the gap enables the section of the part of the central cylinder extending into the middle cylinder section to be in an incomplete annular shape.
2. A pure oil shale CFB boiler as claimed in claim 1, wherein:
the hearth section is of a rectangular structure with the length of 9500mm and the width of 4750 mm.
3. A pure oil shale CFB boiler as claimed in claim 1, wherein:
a screen type heating surface is arranged in the hearth; the screen type heating surface is three screen type superheaters, two of the screen type superheaters are parallel to the short side of the hearth, the other screen type superheaters are parallel to the long side of the hearth, and the three are distributed at intervals in a delta shape.
4. A pure oil shale CFB boiler as claimed in claim 1, wherein:
the lower part of the hearth is a tapered section which is gradually reduced, and the dense phase zone height of the tapered section is at least 12 m.
5. A pure oil shale CFB boiler according to claim 4, wherein:
the hearth is at least provided with two feeding ports which are mutually spaced in the height direction of the hearth; the feeding device is communicated with the feeding port and supplies materials to the hearth through the feeding port.
6. A pure oil shale CFB boiler according to claim 4, wherein:
the ignition device is connected to the lower opening of the conical section of the hearth and is used for ignition;
and a plurality of low-temperature superheaters, high-temperature superheaters, coal economizers and horizontal air preheaters are sequentially arranged in the tail vertical shaft flue.
CN201910571604.4A 2019-06-28 2019-06-28 Pure fuel oil shale CFB boiler Active CN110285400B (en)

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CN201910571604.4A CN110285400B (en) 2019-06-28 2019-06-28 Pure fuel oil shale CFB boiler

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Application Number Priority Date Filing Date Title
CN201910571604.4A CN110285400B (en) 2019-06-28 2019-06-28 Pure fuel oil shale CFB boiler

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CN110285400B true CN110285400B (en) 2020-10-09

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1954176A (en) * 2004-04-29 2007-04-25 福斯特韦勒能源股份公司 Method of combusting oil shale in a circulating fluidized bed boiler
CN101113344A (en) * 2007-05-09 2008-01-30 东北电力大学 Kerosene shale comprehensive utilization process
CN101117584A (en) * 2007-05-09 2008-02-06 东北电力大学 Integral process for oil shale retorting oil refining and coal-char combustion power generation
CN105444144A (en) * 2015-12-24 2016-03-30 哈尔滨锅炉厂有限责任公司 300MWCFB boiler and distribution method for oil shale for combustion
CN206386922U (en) * 2016-12-28 2017-08-08 郑州锅炉股份有限公司 A kind of central tube offset efficient cyclone separator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1954176A (en) * 2004-04-29 2007-04-25 福斯特韦勒能源股份公司 Method of combusting oil shale in a circulating fluidized bed boiler
CN101113344A (en) * 2007-05-09 2008-01-30 东北电力大学 Kerosene shale comprehensive utilization process
CN101117584A (en) * 2007-05-09 2008-02-06 东北电力大学 Integral process for oil shale retorting oil refining and coal-char combustion power generation
CN105444144A (en) * 2015-12-24 2016-03-30 哈尔滨锅炉厂有限责任公司 300MWCFB boiler and distribution method for oil shale for combustion
CN206386922U (en) * 2016-12-28 2017-08-08 郑州锅炉股份有限公司 A kind of central tube offset efficient cyclone separator

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