CN111156501A - Center cylinder, method for forming center cylinder, separator and circulating fluidized bed boiler - Google Patents
Center cylinder, method for forming center cylinder, separator and circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN111156501A CN111156501A CN202010001178.3A CN202010001178A CN111156501A CN 111156501 A CN111156501 A CN 111156501A CN 202010001178 A CN202010001178 A CN 202010001178A CN 111156501 A CN111156501 A CN 111156501A
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- air
- separator
- central cylinder
- pressure
- virtual
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Classifications
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a central cylinder, which is composed of an air curtain with a circular section and is a virtual air curtain central cylinder. The invention changes a real object center cylinder of the traditional technology into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air deep staged combustion after the virtual center cylinder is introduced with air, and can reduce NO in the furnaceXThe emission of the boiler can also reduce the carbon content of the fly ash of the boiler, and the aim of improving the efficiency of the boiler can be fulfilled; and the height of the virtual central cylinder can be adjusted by adjusting the wind pressure and the wind volume, so that the efficiency of the separator can be adjusted on line.
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 wide combustion adaptability, inherent inferior coal combustion technology, strong load regulation characteristic, high combustion efficiency, low pollutant discharge, easy realization of comprehensive utilization of ash and slag, and the like, and is widely used in various countries in the world. The fluidized bed boiler has the unique advantages, presents a rapidly-developing situation in China, is the country with the largest total fluidized bed boiler amount in the world at present, and has the fluidized bed unit with the largest single-machine capacity at the same time.
The center cylinder of the separator can not be repaired after carbonization deformation due to long-time operation at high temperature, only a new center cylinder can be replaced, the cost for replacing the center cylinder is high, about 80-90 ten thousand yuan is needed for replacing one center cylinder of a 300MW unit, the maintenance period is long due to the inconvenience of maintenance of the position of the center cylinder, the minimum time is 15-20 days, and the normal power generation of the unit is seriously influenced.
Disclosure of Invention
The invention aims to solve the problem 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 a virtual air curtain central cylinder and is formed by an air curtain with a circular cross section.
Preferably, the virtual air curtain central cylinder is arranged at an air outlet of the cyclone separator.
Preferably, a circle of high-pressure nozzles are arranged along the circumferential direction of the air outlet of the cyclone separator; the high-pressure sprayer is connected with an air source, the air source sends high-pressure air into the high-pressure sprayer, and an air curtain with a circular cross section is formed through the high-pressure sprayer to form the virtual air curtain central cylinder.
Preferably, the air outlet direction of the high-pressure spray head is vertically downward to form a cylindrical central cylinder.
Preferably, the high-pressure nozzles are arranged on a plurality of groups of arc-shaped headers, and the plurality of groups of arc-shaped headers form a circle.
Preferably, an air inlet is formed in one side, close to the inner wall of the air outlet of the cyclone separator, of the header;
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 degree of the adjusting door.
A second aspect of the invention provides a method of forming a central cartridge by forming a downwardly directed air curtain at the outlet of the cyclonic separator; the height of the central cylinder can be adjusted by adjusting the wind pressure and the wind quantity of the outlet wind.
A third aspect of the invention provides a separator which is 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 central cylinder.
The invention has the advantages and positive effects that: the invention changes a real object center cylinder of the traditional technology into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air deep staged combustion after the virtual center cylinder is introduced with air, and can reduce NO in the furnaceXThe emission of the boiler can also reduce the carbon content of the fly ash of the boiler, and the aim of improving the efficiency of the boiler can be fulfilled; and the height of the virtual central cylinder can be adjusted by adjusting the wind pressure and the wind volume, so that the efficiency of the separator can be adjusted on line.
Drawings
FIG. 1 is a schematic view of the construction of a virtual air curtain central cartridge of the present invention;
FIG. 2 is a schematic top view of a virtual air curtain center tube 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, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
As shown in fig. 1, 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 10, that is, a vertically downward air curtain is formed at an air outlet 20 of a separator, and the air curtain forms the central cylinder.
The central cylinder is a key part of the separator, plays a decisive role in the separation efficiency of the separator, is generally manufactured by two modes of rolling or casting a steel plate, and has deformation and shedding phenomena caused by abrasion and high-temperature alternating stress after long-term operation because the central cylinder usually operates at the high temperature of 750-950 ℃ and in a high-ash environment.
The efficiency of the separator is greatly reduced after the central cylinder deforms and falls off, so that ash circulation cannot be normally established, the circulation multiplying power is reduced, and as a result, circulating materials returning to a hearth are reduced, so that the bed temperature of a boiler is increased, the carbon content of fly ash is increased, the efficiency of the boiler is reduced, the bed pressure of the boiler cannot be maintained to operate in severe cases, the possibility of coking of the boiler is increased, the boiler cannot operate, and meanwhile, NO at the outlet of the hearth cannot be maintained to ensure that the boiler can not operateXThe temperature can be greatly increased, the denitration medium is increased, and the safety and the economical efficiency of the boiler are seriously threatened.
The invention changes a real object center cylinder of the traditional technology into a virtual center cylinder, can thoroughly solve the problems of deformation and falling of the center cylinder of the separator, realizes air deep staged combustion after the virtual center cylinder is introduced with air, and can reduce NO in the furnaceXThe emission of the boiler can also reduce the carbon content of the fly ash of the boiler, and the aim of improving the efficiency of the boiler can be fulfilled.
Specifically, as shown in fig. 2, in a specific embodiment of the present invention, the virtual air curtain central cylinder 10 is disposed at the air outlet 20 of the cyclone separator; further, a circle of high-pressure nozzles 101 are arranged along the circumferential direction of the air outlet 20 of the cyclone separator; the high-pressure sprayer 101 is connected with an air source, high-pressure air is fed into the air source, and an air curtain with a circular section is formed through the high-pressure sprayer 101 to form the virtual air curtain central cylinder; the air outlet direction of the high-pressure spray head is vertical downward to form a cylindrical central cylinder 10.
In the 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 downwards to form a cylindrical air curtain to replace an original steel central cylinder, so that the problems of deformation and falling of the central cylinder are thoroughly solved.
Further, in a preferred embodiment of the present invention, the high pressure nozzles are disposed on a plurality of sets of arc-shaped headers 102, and the plurality of sets of arc-shaped headers 102 form a circumference, that is, the high pressure nozzles 101 are disposed at the air outlet 20 of the separator through the plurality of sets of arc-shaped headers 102; an air inlet 103 is formed in one side of the inner wall of the header 102, which is close to the air outlet 20 of the cyclone separator; 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 by a complete circumferential header, or may be formed by two sets of semi-arc headers, and the number of the sets of the headers does not limit the present invention; in a specific embodiment of the present invention, 4 sets of headers are fixedly disposed on an inner wall of the air outlet, the 4 sets of headers are all in a shape of a quarter of a circular arc, the 4 sets of headers are tightly attached to the inner wall of the air outlet to form a complete circumference, and the headers are fixedly connected to the inner wall of the air outlet; a plurality of high-pressure spray heads are uniformly distributed in the header, and the air outlet direction of the high-pressure spray heads is vertical downward.
Specifically, in order not to affect the outlet air of 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 header is provided with a plurality of gas outlets, every the gas outlet is connected with high pressure nozzle.
Further, in a specific embodiment of the present invention, 4 sets of headers are fixedly disposed on an inner wall of the air outlet, an air inlet of each set of headers penetrates through a sidewall of the air outlet of the cyclone separator and extends to an outside of the air outlet of the cyclone separator, the air inlet is connected to the air source through an air inlet pipe 104, the air inlet pipe 104 is provided with an adjusting door, and a height of the air curtain central cylinder is adjusted by adjusting an opening degree of the adjusting door; further, the regulation door include a set of electronic regulation door 105 and set up in manual regulation door 106 around the electronic regulation door, at the in-process of concrete work, the manual regulation door around the electronic regulation door keeps full open mode, adjusts the height of a virtual center section of thick bamboo of separator through the aperture of adjusting the electronic regulation door, because the efficiency of separator has the direct relation with the height of a center section of thick bamboo, in this embodiment, can adjust the height of a 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 present invention provides a method of forming a central cartridge, in particular: forming a vertically 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 outlet wind.
As shown in fig. 3, a third aspect of the present invention provides a separator, which includes a separator body 30, wherein the separator body 30 has a cylindrical upper portion and a conical lower portion, an inlet 40 is disposed at one side of a top end of the separator body 30, the inlet 40 is disposed along a side wall of the separator body, a material collecting opening 50 is disposed at a bottom of the separator body, an air outlet 20 is disposed at a top end of the separator body, and a virtual air curtain central cylinder 10 facing downward is disposed at the air outlet.
The invention provides a circulating fluidized bed boiler, which comprises a hearth, a cyclone separator, a tail flue and accessory 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 the air outlet is provided with a virtual air curtain central cylinder which vertically faces downwards.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. A center cartridge, characterized by: the central cylinder is composed of an air curtain with a circular section and is a virtual air curtain central cylinder.
2. The center cartridge as set forth in claim 1, wherein: the virtual air curtain central cylinder is arranged at an air outlet of the cyclone separator.
3. The central cartridge according to claim 1 or 2, characterized in that: a circle of high-pressure nozzles are arranged along the circumferential direction of the air outlet of the cyclone separator; the high-pressure sprayer is connected with an air source, the air source sends high-pressure air into the high-pressure sprayer, and an air curtain with a circular cross section is formed through the high-pressure sprayer to form the virtual air curtain central cylinder.
4. The center cartridge as set forth in claim 3, wherein: the air outlet direction of the high-pressure spray head is vertical downward to form a cylindrical central cylinder.
5. The center cartridge as set forth in claim 4, wherein: the high-pressure spray heads are arranged on a plurality of groups of arc-shaped headers, and the plurality of groups of arc-shaped headers form a circumference.
6. The center cartridge as set forth in claim 5, wherein: an air inlet is formed in one side, close to the inner wall of the air outlet of the cyclone separator, of the header;
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.
7. The center cartridge as set forth in claim 6, wherein: 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 degree of the adjusting door.
8. A method of forming a central cartridge, wherein a downwardly directed curtain of air is formed at the outlet of the cyclonic separator; the height of the central cylinder can be adjusted by adjusting the wind pressure and the wind quantity of the outlet wind.
9. A separator, characterized by: the separator is a cyclone separator comprising a central cartridge according to any one of claims 1 to 7.
10. A circulating fluidized bed boiler, characterized by: the circulating fluidized bed boiler comprises the separator of claim 8.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111156501A true CN111156501A (en) | 2020-05-15 |
| CN111156501B CN111156501B (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| CN (1) | CN111156501B (en) |
Cited By (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 (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9402526D0 (en) * | 1994-02-09 | 1994-03-30 | Wickham Mark F | Fluidised bed combustion |
| CN1240021A (en) * | 1996-10-15 | 1999-12-29 | 西纳吉技术有限公司 | Corrosion protection for utility boiler side walls |
| WO2003033158A1 (en) * | 2001-10-19 | 2003-04-24 | Rapid Granulator Ab | Dust separator |
| CN1676222A (en) * | 2004-12-14 | 2005-10-05 | 石油大学(北京) | Anti-coking cyclone separator |
| CN103398375A (en) * | 2013-07-01 | 2013-11-20 | 中国华能集团清洁能源技术研究院有限公司 | Cyclone separator with wear-resistant target section and guiding device for circulating fluidized bed boiler |
| CN103471092A (en) * | 2013-09-05 | 2013-12-25 | 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 |
| 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 |
| WO2017174751A1 (en) * | 2016-04-08 | 2017-10-12 | Steinmüller Engineering GmbH | Method for the low-nitrogen-oxide combustion of solid, liquid, or gaseous fuels, in particular coal dust, and a burner and a firing installation for performing the method |
-
2020
- 2020-01-02 CN CN202010001178.3A patent/CN111156501B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9402526D0 (en) * | 1994-02-09 | 1994-03-30 | Wickham Mark F | Fluidised bed combustion |
| CN1240021A (en) * | 1996-10-15 | 1999-12-29 | 西纳吉技术有限公司 | Corrosion protection for utility boiler side walls |
| WO2003033158A1 (en) * | 2001-10-19 | 2003-04-24 | Rapid Granulator Ab | Dust separator |
| CN1676222A (en) * | 2004-12-14 | 2005-10-05 | 石油大学(北京) | Anti-coking cyclone separator |
| CN103398375A (en) * | 2013-07-01 | 2013-11-20 | 中国华能集团清洁能源技术研究院有限公司 | Cyclone separator with wear-resistant target section and guiding device for circulating fluidized bed boiler |
| CN103471092A (en) * | 2013-09-05 | 2013-12-25 | 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 |
| 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 |
| WO2017174751A1 (en) * | 2016-04-08 | 2017-10-12 | Steinmüller Engineering GmbH | Method for the low-nitrogen-oxide combustion of solid, liquid, or gaseous fuels, in particular coal dust, and a burner and a firing installation for performing the method |
Cited By (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 |
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| Publication number | Publication date |
|---|---|
| CN111156501B (en) | 2023-05-30 |
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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 |