CN101881440A - Annular constant-current hood - Google Patents
Annular constant-current hood Download PDFInfo
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- CN101881440A CN101881440A CN 201010228307 CN201010228307A CN101881440A CN 101881440 A CN101881440 A CN 101881440A CN 201010228307 CN201010228307 CN 201010228307 CN 201010228307 A CN201010228307 A CN 201010228307A CN 101881440 A CN101881440 A CN 101881440A
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- outer cover
- blast cap
- interior pipe
- hood
- around
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Abstract
The invention relates to an annular constant-current hood which comprises an outer hood, wherein an inner pipe is inserted into the outer hood to form an annular sealing structure, the bottom end of the outer hood is threaded connection with the inner pipe into a whole, the periphery of the inner pipe is provided with inner holes, the top end of the inner pipe is provided with a top cover, the top cover is provided with a small hole, the thickened cylindrical periphery of the middle of the outer hood is provided with outer holes, the axes of the outer holes and a horizontal direction have an included angle theta of 1-85 DEG, the lower part of the outer hood is in a taper structure, and the range of the taper angle beta is 1-70 DEG. The invention has characteristics of good wear resistance, large-particle deposition, less resistance and convenient maintenance and replacement.
Description
Technical field
The present invention relates to a kind of blast cap, particularly a kind of annular constant-current hood.
Background technology
The blast cap that existing CFBB adopts has many forms, and through updating, comparatively the typical structure of extensive use has T type and bell-jar.T type blast cap is to arrange several downward-sloping short tubes around the central tube, and its advantage is simple in structure, is convenient to make, but is prone to the in-furnace dust slag in actual use by the bleed phenomenon of air compartment of blast cap short tube, influences the normal operation of fluidized-bed combustion boiler.The bell-jar blast cap is made up of central tube and outer cover two parts, its design principle is to be furnished with aperture around the central tube upper end, have oval horizontal apertures in the outer cover lower end, the subject matter of this type blast cap is that resistance is bigger, be prone to wearing and tearing of outer cover top and aperture and form particle to the rapid wearing and tearing around the aperture because of injection, and bulky grain easily deposits in the stove, causes in the boiler hearth of circulating fluidized bed problems such as the inhomogeneous and bed coking of fluidisation.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the objective of the invention is to propose a kind of annular constant-current hood, the top of its outer cover is a hemispherical, middle cylindrical for what thicken, the bottom is a pyramidal structure, and the axis of the airing hole on the outer cover and horizontal direction have an angle theta, and the bottom of outer cover and interior pipe are by being threaded, interior pipe inserts and forms the close palace of annular gap structure in the outer cover, and this blast cap has the advantages that wearability is good, prevent that bulky grain from depositing, resistance is little, be convenient to safeguard replacing.
To achieve these goals, the technical solution used in the present invention is: a kind of annular constant-current hood, comprise outer cover 1, pipe 2 in inserting in the outer cover 1, described outer cover 1 top is that hemispherical, middle part are pyramidal structure for cylindrical, the bottom of thickening, in pipe 2 form annular close palace structure with outer cover 1, the bottom of outer cover 1 and interior pipe 2 are connected as a single entity replaceable outer cover 1 by screw thread.Dispose outer hole 3 around the thickening at outer cover 1 middle part columniform, the axis in outer hole 3 and horizontal direction have an angle theta, the scope of θ is 1 °～85 °, the top of interior pipe 2 disposes top cover 5, dispose aperture 6 on the top cover 5, in pipe dispose endoporus 4 around 2, outer cover 1 bottom is a pyramidal structure, cone angle beta scope be 1 °～70 °.
Because outer cover 1 adopts and has hemispheric smooth contour structure, and the outer gas flow hole emission direction on the outer cover 1 is downward-sloping, avoid the adjacent blast cap of gas flow purging and caused wearing and tearing, structurally, the present invention has adopted the outer hole of offering on outer cover 13 to be downward-sloping structure, make and can not be deposited on the air distribution plate as bulky grains such as gangues in the boiler hearth of circulating fluidized bed, thereby the fluidization quality stable in the stove and the normal operation of boiler have been guaranteed, and adopt the resistance of lower blast cap, can reduce the electrical energy consumption of ventilation of boiler, owing to by being threaded, when maintenance, be easy to dismounting and replacing outer cover between outer cover 1 and the interior pipe 2.
Description of drawings
Fig. 1 is the structure cutaway view of prior art T type blast cap.
Fig. 2 is the structure cutaway view of prior art bell-jar blast cap.
Fig. 3 is a structure cutaway view of the present invention.
Fig. 4 is the structure cutaway view of the embodiment of the invention.
Among the figure: 1 is outer cover, and 2 is interior pipe, and 3 is outer hole, and 4 is endoporus, and 5 is top cover, and 6 is endoporus, and 7 is air distribution plate, and 8 is refractory material, and 9 is the central tube of T type blast cap, and 10 is the short tube of T type blast cap, and 11 is the central tube of bell-jar blast cap, and 12 is the outer cover of bell-jar blast cap.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are elaborated.
As shown in Figure 1, the T type blast cap of prior art is to arrange several downward-sloping short tubes 11 around central tube 9, its advantage is simple in structure, be convenient to make, but be prone to the in-furnace dust slag in actual use by the bleed phenomenon of air compartment of blast cap short tube 11, influence the normal operation of fluidized-bed combustion boiler.
As shown in Figure 2, the bell-jar blast cap of prior art is made up of central tube 11 and outer cover 12 two parts, its design principle is to be furnished with aperture all around in central tube 11 upper ends, have oval horizontal apertures in outer cover 12 lower ends, the subject matter of this type blast cap is that resistance is bigger, be prone to outer cover top wearing and tearing and aperture and form particle to the rapid wearing and tearing around the aperture, and bulky grain easily deposits in the stove, cause in the boiler hearth of circulating fluidized bed problems such as the inhomogeneous and bed coking of fluidisation because of injection.
As shown in Figure 3, a kind of annular constant-current hood of the present invention, comprise outer cover 1, pipe 2 in inserting in the outer cover 1, described outer cover 1 top is that hemispherical, middle part are pyramidal structure for cylindrical, the bottom of thickening, it is bigger that this kind structure has solved prior art bell-jar blast cap resistance, is prone to wearing and tearing of outer cover top and aperture and forms particle to the rapid wear problems around the aperture because of injection; Interior pipe 2 forms annular close palace structure with outer cover 1, the bottom of outer cover 1 and interior pipe 2 are connected as a single entity by screw thread, replaceable outer cover 1, this kind structure has solved that bulky grain easily deposits in the prior art bell-jar blast cap stove, causes in the boiler hearth of circulating fluidized bed problems such as the inhomogeneous and bed coking of fluidisation.Dispose outer hole 3 around the thickening at outer cover 1 middle part columniform, the axis in outer hole 3 and horizontal direction have an angle theta, the scope of θ is 1 °～85 °, the top of interior pipe 2 disposes top cover 5, dispose aperture 6 on the top cover 5, in pipe dispose endoporus 4 around 2, outer cover 1 bottom is a pyramidal structure, cone angle beta scope be 1 °～70 °.
Operation principle of the present invention is: when air-flow when the lower end of interior pipe 2 upwards flows into, by interior pipe 2 up after, from around the annular gap that flows between outer covers 1 and the interior pipe 2 of endoporus 4, flow downward then, flow out from the outer hole 3 that outer cover 1 is offered at last.
As shown in Figure 4, a kind of annular constant-current hood of specific embodiments of the invention, by outer cover 1 and interior pipe 2 makeup ring clevis laminar labyrinth structures, after air-flow by the CFBB air compartment rises to its top by interior pipe 2, by the endoporus 4 around the interior pipe 2 flow to and outer cover 1 between annular gap in, flowed downward by interlayer, the outer hole 3 around at last from the outer cover 1 is tilted to down outflow.
The material of outer cover 1 is ZG40Cr25Ni20, and the material of interior pipe 2 is 1Cr18Ni9Ti.
The top of outer cover 1 is a hemispherical dome structure, and the shape of cross section of the middle part straight length that links to each other with the hemispherical at outer cover 1 top is for circular, and pipe thickness is greater than the top, and the bottom cone can make air-flow downward-sloping outflow along its 8 circular apertures 3 that evenly distribute all around.The top of interior pipe 2 disposes top cover 5, disposes the aperture 6 of 3 diameter 5mm on the top cover 5.The jet axis in outer hole 3 and horizontal direction angle theta are 15 °.Dispose the circular inner hole 4 of two row's air feed stream outflows around the upper end of interior pipe 2, aperture is along the circumferential direction uniform, and the aperture is 11.3mm, and every row's quantity is 8, and the aperture in the outer hole 3 of outer cover 1 is 25mm, and air velocity is 40m/s.Outer cover 1 bottom is a pyramidal structure, cone angle beta be 15 °.
By being threaded, interior pipe 2 is welded on the air distribution plate 7, lays the refractory material of 100mm thickness on the air distribution plate 7 between the bottom of outer cover 1 and the interior pipe 2.
Claims (5)
1. replaceable wear-resisting blast cap, comprise outer cover (1), pipe (2) in inserting in the outer cover (1), it is characterized in that: described outer cover (1) top is that hemispherical, middle part are pyramidal structure for cylindrical, the bottom of thickening, interior pipe (2) forms annular close palace structure with outer cover (1), and the bottom of outer cover (1) and interior pipe (2) are connected as a single entity by screw thread.
2. blast cap according to claim 1 is characterized in that: the columniform of the thickening at described outer cover (1) middle part disposes outer hole (3) all around, and the axis and the horizontal direction of outer hole (3) have an angle theta, and the scope of θ is 1 °～85 °.
3. blast cap according to claim 1 and 2 is characterized in that: the top of pipe (2) is provided with top cover (5) in described, has aperture (6) on the top cover (5).
4. according to claim 1 or 3 described blast caps, it is characterized in that: be provided with endoporus (4) around the described interior pipe (2).
5. blast cap according to claim 1 is characterized in that: described outer cover (1) bottom is a pyramidal structure, cone angle beta scope be 1 °～70 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010228307 CN101881440A (en) | 2010-07-15 | 2010-07-15 | Annular constant-current hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010228307 CN101881440A (en) | 2010-07-15 | 2010-07-15 | Annular constant-current hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101881440A true CN101881440A (en) | 2010-11-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010228307 Pending CN101881440A (en) | 2010-07-15 | 2010-07-15 | Annular constant-current hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101881440A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975396A (en) * | 2010-11-30 | 2011-02-16 | 哈尔滨哈锅锅炉工程技术有限公司 | Circulating fluidized bed boiler air hood |
| CN106287684A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of blast cap for CFBB |
| CN106678786A (en) * | 2017-03-13 | 2017-05-17 | 哈尔滨红光锅炉总厂有限责任公司 | Bell jar type wind cap for environment-friendly energy-saving circulating fluidized bed boiler |
| WO2017206430A1 (en) * | 2016-05-30 | 2017-12-07 | 广东工业大学 | Circulating fluidized bed combustion system with uniform air distribution device |
| CN113773879A (en) * | 2021-10-08 | 2021-12-10 | 新疆宜化化工有限公司 | Hood for circulating fluidized bed gasification furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207522Y (en) * | 1994-12-15 | 1995-09-13 | 烟台华鲁热电有限公司 | Nozzle button of circulating fluidizing bed boiler |
| CN2658578Y (en) * | 2003-09-28 | 2004-11-24 | 李正海 | Nozzle button of recirculating fluidized bed boiler |
| CN1236226C (en) * | 2001-10-31 | 2006-01-11 | 翟科展 | Anti-wear cowl |
| CN2789592Y (en) * | 2005-02-05 | 2006-06-21 | 太原锅炉集团有限公司 | Easy-to-change jacketed bell type nozzle button |
| CN2851868Y (en) * | 2005-11-03 | 2006-12-27 | 宜兴市申兴瓷件厂 | Highly-wearable alumina ceramic blast cap |
-
2010
- 2010-07-15 CN CN 201010228307 patent/CN101881440A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207522Y (en) * | 1994-12-15 | 1995-09-13 | 烟台华鲁热电有限公司 | Nozzle button of circulating fluidizing bed boiler |
| CN1236226C (en) * | 2001-10-31 | 2006-01-11 | 翟科展 | Anti-wear cowl |
| CN2658578Y (en) * | 2003-09-28 | 2004-11-24 | 李正海 | Nozzle button of recirculating fluidized bed boiler |
| CN2789592Y (en) * | 2005-02-05 | 2006-06-21 | 太原锅炉集团有限公司 | Easy-to-change jacketed bell type nozzle button |
| CN2851868Y (en) * | 2005-11-03 | 2006-12-27 | 宜兴市申兴瓷件厂 | Highly-wearable alumina ceramic blast cap |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975396A (en) * | 2010-11-30 | 2011-02-16 | 哈尔滨哈锅锅炉工程技术有限公司 | Circulating fluidized bed boiler air hood |
| CN106287684A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of blast cap for CFBB |
| WO2017206430A1 (en) * | 2016-05-30 | 2017-12-07 | 广东工业大学 | Circulating fluidized bed combustion system with uniform air distribution device |
| US10174936B2 (en) | 2016-05-30 | 2019-01-08 | Guangdong University Of Technology | Circular fluidizing bed combustion system with uniform airflow distributing device |
| CN106678786A (en) * | 2017-03-13 | 2017-05-17 | 哈尔滨红光锅炉总厂有限责任公司 | Bell jar type wind cap for environment-friendly energy-saving circulating fluidized bed boiler |
| CN113773879A (en) * | 2021-10-08 | 2021-12-10 | 新疆宜化化工有限公司 | Hood for circulating fluidized bed gasification furnace |
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Open date: 20101110 |