CN111156501B - Center tube, method of forming center tube, separator, and circulating fluidized bed boiler - Google Patents
Center tube, method of forming center tube, separator, and circulating fluidized bed boiler Download PDFInfo
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- CN111156501B CN111156501B CN202010001178.3A CN202010001178A CN111156501B CN 111156501 B CN111156501 B CN 111156501B CN 202010001178 A CN202010001178 A CN 202010001178A CN 111156501 B CN111156501 B CN 111156501B
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- air
- separator
- central cylinder
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- cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
- B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
Abstract
The invention provides a central cylinder, which consists of an air curtain with a circular cross section and is a virtual air curtain central cylinder. The invention removes the physical center cylinder in the prior art, changes the physical center cylinder into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air depth staged combustion after the virtual center cylinder is filled with air, and can reduce NO in the furnace X The carbon content of fly ash of the boiler can be reduced, and the aim of improving the efficiency of the boiler can be fulfilled; and the height of the virtual center cylinder can be adjusted by adjusting the wind pressure and the wind quantity, so that the on-line adjustment of the efficiency of the separator can be realized.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a central cylinder, a method for forming the central cylinder, a separator and a circulating fluidized bed boiler.
Background
The circulating fluidized bed boiler has the advantages of vivid combustion technology of inferior coal, strong load regulation property, high combustion efficiency, low pollutant emission, easy realization of comprehensive utilization of ash and the like, has wide combustion adaptability and is widely used in countries of the world. The fluidized bed boiler has the unique advantages, the situation of rapid development is presented in China, the China is the country with the largest total amount of the global fluidized bed boiler, and the fluidized bed unit with the largest single machine capacity is provided at present, but the problems brought by the fluidized bed boiler are more at the same time of development, wherein the deformation and the falling off of the central cylinder are one of the most serious problems, and the problem needs to be solved.
The central cylinder of the separator can not be repaired after carbonization deformation due to long-time operation at high temperature, only a new central cylinder can be replaced, the cost for replacing the central cylinder is high, about 80-90 ten thousand yuan is needed for replacing one central cylinder of a 300MW unit, and the maintenance period is long due to the fact that the central cylinder is inconvenient to maintain, 15-20 days are needed at least, and normal power generation of the unit is seriously affected.
Disclosure of Invention
The invention aims to solve the problems of deformation and falling of a central cylinder of a separator in the prior art.
The first aspect of the present invention provides a central cylinder, which is formed by an air curtain with a circular cross section, and is a virtual air curtain central cylinder.
Preferably, the virtual air curtain center cylinder is arranged at an air outlet of the cyclone separator.
Preferably, a circle of high-pressure spray heads are arranged along the circumferential direction of the air outlet of the cyclone separator; the high-pressure spray head is connected with a gas source, the gas source is used for feeding high-pressure gas, and a gas curtain with a circular section is formed through the high-pressure spray head, so that the virtual gas curtain central cylinder is formed.
Preferably, the air outlet direction of the high-pressure spray head is vertically downward to form a cylindrical central cylinder.
Preferably, the high-pressure spray heads are arranged on a plurality of groups of arc-shaped headers, and a plurality of groups of arc-shaped headers form a circumference.
Preferably, an air inlet is arranged on one side of the inner wall of the header close to the air outlet of the cyclone separator;
the air inlet penetrates through the side wall of the air outlet of the cyclone separator and extends to the outside of the air outlet of the cyclone separator;
the air inlet is connected with the air source.
Preferably, the air inlet is connected with the air source through an air inlet pipeline;
the air inlet pipeline is provided with an adjusting door, and the height of the air curtain central cylinder is adjusted by adjusting the opening of the adjusting door.
In a second aspect of the invention, there is provided a method of forming a central cylinder, forming a downward air curtain at the outlet of the cyclone; the height of the central cylinder can be adjusted by adjusting the wind pressure and the wind quantity of the wind outlet.
A third aspect of the invention provides a separator, the separator being a cyclonic separator comprising a virtual air curtain central cylinder.
A fourth aspect of the present invention is a circulating fluidized bed boiler, characterized in that: the circulating fluidized bed boiler comprises a cyclone separator, wherein the cyclone separator comprises a virtual air curtain center cylinder.
The invention has the advantages and positive effects that: the invention removes the physical center cylinder in the prior art, changes the physical center cylinder into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air depth staged combustion after the virtual center cylinder is filled with air, and can reduce NO in the furnace X The carbon content of fly ash of the boiler can be reduced, and the aim of improving the efficiency of the boiler can be fulfilled; and the height of the virtual center cylinder can be adjusted by adjusting the wind pressure and the wind quantity, so that the on-line adjustment of the efficiency of the separator can be realized.
Drawings
FIG. 1 is a schematic view of the structure of a virtual air curtain center cylinder of the present invention;
FIG. 2 is a schematic top view of a virtual air curtain center cylinder of the present invention;
fig. 3 is a schematic view of the structure of the separator of the present invention.
Detailed Description
For a better understanding of the present invention, the present invention is further described below with reference to specific examples and drawings.
As shown in fig. 1, the present invention provides a central cylinder, which is formed by a gas curtain with a circular cross section, and is a virtual gas curtain central cylinder 10, i.e. a vertically downward gas curtain is formed at the air outlet 20 of the separator, and the gas curtain forms the central cylinder.
The central cylinder is a key component of the separator, plays a decisive role in the separation efficiency of the separator, is generally manufactured by two modes of rolling or casting of steel plates, and is deformed and falls off due to abrasion and high-temperature alternating stress in long-term operation because the central cylinder is often operated under the high-temperature and high-ash environment of 750-950 ℃.
The efficiency of the separator is greatly reduced after the central cylinder is deformed and falls off, and the guide is realizedThe ash-causing circulation cannot be normally established, the circulation multiplying power is reduced, the result is that the circulation material returned to the hearth is reduced to cause the increase of the temperature of the boiler bed, the increase of the carbon content of fly ash and the reduction of the boiler efficiency, the boiler bed pressure cannot be maintained to operate in severe cases, the possibility of coking of the boiler is increased, the boiler cannot operate finally, and meanwhile, the NO at the outlet of the hearth is not available X Can greatly increase, the denitration medium is increased, and the safety and the economy of the boiler are seriously dangerous.
The invention removes the physical center cylinder in the prior art, changes the physical center cylinder into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air depth staged combustion after the virtual center cylinder is filled with air, and can reduce NO in the furnace X The carbon content of the fly ash of the boiler can be reduced, and the purpose of improving the efficiency of the boiler can be achieved.
Specifically, as shown in fig. 2, in a specific embodiment of the present invention, the virtual air curtain center cylinder 10 is disposed at an air outlet 20 of the cyclone separator; further, a ring of high-pressure nozzles 101 is arranged along the circumferential direction of the cyclone air outlet 20; the high-pressure spray nozzle 101 is connected with a gas source, the gas source is used for feeding high-pressure gas, and a gas curtain with a circular section is formed through the high-pressure spray nozzle 101 to form the virtual gas curtain central cylinder; the air outlet direction of the high-pressure spray head is vertically downward to form a cylindrical central cylinder 10.
In this embodiment, a circle of high-pressure nozzles 101 are arranged along the circumferential direction of the air outlet of the cyclone separator, the air outlet direction of the high-pressure nozzles 101 is vertically downward, and high-pressure air is fed downward to form a cylindrical air curtain, so that the problems of deformation and falling of the central cylinder are thoroughly solved instead of the original steel central cylinder.
Further, in a preferred embodiment of the present invention, the high-pressure spray nozzles are disposed on a plurality of groups of arc-shaped headers 102, and a plurality of groups of arc-shaped headers 102 form a circumference, that is, the high-pressure spray nozzles 101 are disposed at the air outlet 20 of the separator through a plurality of groups of arc-shaped headers 102; an air inlet 103 is arranged on one side of the header 102, which is close to the inner wall of the cyclone separator air outlet 20; the air inlet 103 penetrates through the side wall of the cyclone air outlet 20 and extends to the outside of the cyclone air outlet 20; the air inlet is connected with the air source.
The header 102 may be formed of a complete circumferential header or two sets of semi-circular headers, the number of sets of which is not limiting to the invention; in a specific embodiment of the invention, the inner wall of the air outlet is fixedly provided with 4 groups of headers, the 4 groups of headers are in a quarter circular arc shape, the 4 groups of headers are tightly attached to the inner wall of the air outlet to form a complete circumference, and the headers are fixedly connected with the inner wall of the air outlet; the inside evenly distributed of header has a plurality of high pressure shower nozzles, and the direction of giving vent to anger of high pressure shower nozzle is perpendicular downward.
Specifically, in order not to influence the air outlet of the separator, the air inlet of the header is arranged on one side of the inner wall of the header, which is close to the air outlet of the cyclone separator; the air inlet penetrates through the side wall of the air outlet of the cyclone separator and extends to the outside of the air outlet of the cyclone separator; the air inlet is connected with the air source; the bottom of the header is provided with a plurality of air outlets, and each air outlet is connected with a high-pressure spray head.
Further, in a specific embodiment of the present invention, the inner wall of the air outlet is fixedly provided with 4 groups of headers, the air inlet of each group of headers penetrates through the side wall of the air outlet of the cyclone separator and extends to the outside of the air outlet of the cyclone separator, the air inlet is connected with the air source through an air inlet pipeline 104, the air inlet pipeline 104 is provided with an adjusting door, and the height of the air curtain central cylinder is adjusted by adjusting the opening of the adjusting door; further, the adjusting door includes a set of electric adjusting door 105 and set up in the manual adjusting door 106 around the electric adjusting door, and in the in-process of concrete work, the manual adjusting door around the electric adjusting door keeps full open state, adjusts the height of the virtual center section of thick bamboo of separator through adjusting the aperture of electric adjusting door, because the efficiency of separator has direct relation with the height of center section of thick bamboo, in this embodiment, can adjust the height of virtual center section of thick bamboo through adjusting wind pressure and amount of wind to can realize the online adjustable of separator efficiency.
A second aspect of the invention provides a method of forming a central cartridge, in particular: forming a vertical downward air curtain at an air outlet of the cyclone separator; and the height of the central cylinder can be adjusted by adjusting the wind pressure and the wind quantity of the wind outlet.
As shown in fig. 3, a third aspect of the present invention provides a separator, which includes a separator body 30, wherein an upper portion of the separator body 30 is cylindrical, a lower portion of the separator body 30 is conical, an inlet 40 is provided at a top end side of the separator body 30, the inlet 40 is provided along a sidewall of the separator body, a collecting port 50 is provided at a bottom of the separator body, an air outlet 20 is provided at a top end of the separator body, and a vertical downward virtual air curtain central cylinder 10 is provided at the air outlet.
The fourth aspect of the invention provides a circulating fluidized bed boiler, which comprises a hearth, a cyclone separator, a tail flue and auxiliary equipment thereof, wherein the cyclone separator comprises a separator body, the upper part of the separator body is cylindrical, the lower part of the separator body is conical, one side of the top end of the separator body is provided with an inlet, the inlet is arranged along the side wall of the separator body, the bottom of the separator body is provided with a material collecting port, the top end of the separator body is provided with an air outlet, and a vertical downward virtual air curtain central cylinder is arranged at the air outlet.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by this patent.
Claims (4)
1. The separator is characterized by comprising a central cylinder, wherein the central cylinder consists of an air curtain with a circular cross section and is a virtual air curtain central cylinder, the virtual air curtain central cylinder is arranged at an air outlet of the cyclone separator, and a circle of high-pressure spray heads are arranged along the circumferential direction of the air outlet of the cyclone separator; the high-pressure spray head is connected withThe air source is used for sending high-pressure air, and an air curtain with a circular section is formed through the high-pressure spray head to form the virtual air curtain central cylinder, and after the virtual air curtain central cylinder is filled with air, the air depth staged combustion is realized; thereby reducing NO in the furnace X The discharge of the fly ash and the carbon content of the boiler are reduced;
the air outlet direction of the high-pressure spray head is vertically downward to form a cylindrical central cylinder, the high-pressure spray head is arranged on a plurality of groups of arc-shaped headers, and a plurality of groups of arc-shaped headers form a circumference; an air inlet is formed in one side of the inner wall of the header, which is close to the air outlet of the cyclone separator; the air inlet penetrates through the side wall of the air outlet of the cyclone separator and extends to the outside of the air outlet of the cyclone separator; the air inlet is connected with the air source, and the height of the virtual center cylinder is adjusted by adjusting the air pressure and the air quantity, so that the on-line adjustable separator efficiency is realized.
2. A separator according to claim 1, wherein the inlet is connected to the gas source by an inlet conduit;
the air inlet pipeline is provided with an adjusting door, and the height of the air curtain central cylinder is adjusted by adjusting the opening of the adjusting door.
3. A separator according to claim 2, wherein a downward curtain of air is formed at the outlet of the cyclone separator; the height of the central cylinder can be adjusted by adjusting the wind pressure and the wind quantity of the wind outlet.
4. A circulating fluidized bed boiler, characterized in that the circulating fluidized bed boiler comprises a separator according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001178.3A CN111156501B (en) | 2020-01-02 | 2020-01-02 | Center tube, method of forming center tube, separator, and circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001178.3A CN111156501B (en) | 2020-01-02 | 2020-01-02 | Center tube, method of forming center tube, separator, and circulating fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN111156501A CN111156501A (en) | 2020-05-15 |
| CN111156501B true CN111156501B (en) | 2023-05-30 |
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| CN202010001178.3A Active CN111156501B (en) | 2020-01-02 | 2020-01-02 | Center tube, method of forming center tube, separator, and circulating fluidized bed boiler |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923355A (en) * | 2021-02-04 | 2021-06-08 | 东南大学 | Cyclone separator without central cylinder and separation method |
| CN114011232A (en) * | 2021-12-06 | 2022-02-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Process for separating solid particles from flue gas by using vaporous central barrel cyclone separator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676222A (en) * | 2004-12-14 | 2005-10-05 | 石油大学(北京) | Anti-coking cyclone separator |
| CN105180159A (en) * | 2015-08-26 | 2015-12-23 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method capable of realizing cooling by afterflaming air |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2286345A (en) * | 1994-02-09 | 1995-08-16 | Mark Frederick Wickham | Feeding a fluidised bed |
| US5809913A (en) * | 1996-10-15 | 1998-09-22 | Cinergy Technology, Inc. | Corrosion protection for utility boiler side walls |
| SE0103501D0 (en) * | 2001-10-19 | 2001-10-19 | Rapid Granulator Ab | Separation |
| CN103398375B (en) * | 2013-07-01 | 2016-01-13 | 中国华能集团清洁能源技术研究院有限公司 | With the cyclone separator of circulating fluidized bed boiler of wear-resisting target area and guider |
| CN103471092B (en) * | 2013-09-05 | 2015-07-15 | 无锡华光锅炉股份有限公司 | Supporting structure used for preventing circulating fluidized bed boiler center cylinder from falling off |
| PL3228935T3 (en) * | 2016-04-08 | 2020-05-18 | Steinmüller Engineering GmbH | Method for low nitrous oxide combustion of solid, liquid or gaseous fuels, especially coal dust, a burner and a furnace for performing said method |
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- 2020-01-02 CN CN202010001178.3A patent/CN111156501B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676222A (en) * | 2004-12-14 | 2005-10-05 | 石油大学(北京) | Anti-coking cyclone separator |
| CN105180159A (en) * | 2015-08-26 | 2015-12-23 | 中国科学院工程热物理研究所 | Circulating fluidized bed combustion method capable of realizing cooling by afterflaming air |
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| CN111156501A (en) | 2020-05-15 |
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Effective date of registration: 20230926 Address after: 010090 1303, Unit 2, 13th Floor, Building B7, Greenland Central Plaza, No. 15 Chilechuan Street, Saihan District, Hohhot City, Inner Mongolia Autonomous Region Patentee after: Inner Mongolia Chuyang Intelligent Technology Co.,Ltd. Address before: 010000 Collective household of Electric Power Science Research Institute, No. 21 Xilingol South Road, Yuquan District, Hohhot City, Inner Mongolia Autonomous Region Patentee before: Yuan Donghui Patentee before: Zheng Xiuping |
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