CN107036085B - Slice notch cuttype air distribution device of circulating fluidized bed boiler - Google Patents
Slice notch cuttype air distribution device of circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN107036085B CN107036085B CN201710476285.XA CN201710476285A CN107036085B CN 107036085 B CN107036085 B CN 107036085B CN 201710476285 A CN201710476285 A CN 201710476285A CN 107036085 B CN107036085 B CN 107036085B
- Authority
- CN
- China
- Prior art keywords
- inverted
- air distribution
- distribution plate
- air
- shaped directional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
-
- 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
Landscapes
- 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
A flaky step-shaped air distribution device of a circulating fluidized bed boiler belongs to the technical field of air supply and auxiliary equipment of the circulating fluidized bed boiler. The air distribution device comprises an inclined air distribution plate and an inverted L-shaped directional air cap, wherein a main air pipe of the inverted L-shaped directional air cap is vertically arranged on the inclined air distribution plate; the inverted L-shaped directional hoods are distributed on the inclined air distribution plate in a two-dimensional array; experimental research shows that the horizontal distance between two rows of inverted L-shaped directional air caps adjacent to each other along the descending direction of the inclined air distribution plate and the included angle between the outlet direction of the nozzle pipe and the descending direction of the inclined air distribution plate meet a certain functional relationship. By adopting the air distribution structure, high-speed air sprayed from the nozzle pipe of the rear row inverted L-shaped directional blast cap can be ensured to blow over the top of the front row inverted L-shaped directional blast cap, so that the impact abrasion of the rear exhaust cap on the front exhaust cap is avoided, the service life of the inverted L-shaped directional blast cap is prolonged, the operation period of the boiler is prolonged, and the economical efficiency and the safety of the circulating fluidized bed boiler are improved.
Description
Technical Field
The invention relates to an air distribution mode and an air distribution device in a hearth of a circulating fluidized bed boiler, in particular to a garbage incinerator, which mainly comprises an inclined air distribution plate and a reversed L-shaped directional hood and belongs to the field of air supply technology and auxiliary equipment of the circulating fluidized bed boiler.
Background
In recent years, with the increase of population and the improvement of living standard of people, the amount of garbage generated every day is increasing. If the garbage can not be disposed of in time, the garbage can cause great harm to human and environment. Currently, there are three more mature treatment methods: landfill method, incineration method and biological treatment. The burning method is favored because of a series of advantages of high harmless degree, large volume reduction, capability of recovering heat, timely treatment and the like. The technology of refuse incineration, whether abroad or domestically, is well established and is mainly represented by grate furnaces, fluidized beds and rotary drum type incinerators. Wherein, the application of the circulating fluidized bed combustion technology to treat the household garbage has three advantages: (1) the garbage has strong adaptability; (2) the incineration efficiency is high; and (3) low pollutant discharge.
The air distribution device is used as a main part of the circulating fluidized bed, and the working performance of the air distribution device directly influences the design of the circulating fluidized bed boiler, the particle mixing, flowing and chemical reaction processes, and the safe and economic operation of the boiler. Therefore, the reasonable air distribution mode should ensure the even concentration distribution of the materials in the bed, the timely particle discharge and the like. The horizontally arranged air distribution plate has the advantages of simple structure and the like, and is widely applied to the circulating fluidized bed boiler. When the circulating fluidized bed technology is applied to garbage disposal, the horizontally arranged air distribution plate exposes the following defects: because the municipal refuse has complex components and large difference between the granularity and the density of bed materials, and some large particles and heavy particles are deposited on the air distribution plate and are difficult to discharge, the flow uniformity and the stability in the bed are greatly reduced, and even the non-fluidized state of the bottom is caused. The inclined air distribution plate and the inverted L-shaped directional blast cap can promote heavy large particles to move towards the slag discharge port, and reasonable discharge of particles in the bed is realized.
When the inverted L-shaped directional hood is adopted in the operation of the boiler, the abrasion phenomenon is very serious, partial perforation and coking can be caused in the serious condition, the boiler is forced to be shut down, and the operation period of the boiler is shortened, so that the operation cost of the boiler is increased, and the operation safety of the boiler is seriously influenced. The rear surface of the top of the hood is seriously abraded by checking the hood and observing the damaged hood after the boiler is shut down every time, because the inverted L-shaped directional hood is arranged on the installation design, bed materials are carried by high-speed air coming out from the mouth of the rear exhaust hood to directly blow the top of the front exhaust hood to form impact abrasion, and along with the extension of the operation time, the high-speed air carrying a large number of particles cuts the top and the body of the front exhaust hood to form jet flow, thereby further intensifying the flow field disorder, not only influencing the fluidization quality, but also accelerating the abrasion of the hood and influencing the operation safety and efficiency of the boiler.
Disclosure of Invention
The invention aims to provide a flaky stepped air distribution device of a circulating fluidized bed boiler, which reduces the impact abrasion of a rear exhaust hood on a front exhaust hood on the basis of ensuring the slag discharge efficiency, prolongs the service time of the exhaust hood, further prolongs the operation period of the boiler, and is favorable for improving the safety and the economy of the circulating fluidized bed boiler.
The technical scheme of the invention is as follows:
the utility model provides a slice notch cuttype wind distribution device of circulating fluidized bed boiler, the device includes plenum, slope air distribution plate and arranges the directional hood of "gamma" shape on slope air distribution plate, and "gamma" shape directional hood comprises hood main air pipe and hood spout mouth pipe, its characterized in that: the blast cap main air pipe is vertically arranged on the inclined air distribution plate; the inverted L-shaped directional hoods are distributed on the inclined wind distribution plate in a two-dimensional array, and the horizontal distance delta x between two adjacent rows of directional hoods along the descending direction of the inclined wind distribution plate conforms to the following formula:
in the above formula, θ is an included angle θ between the inclined air distribution plate and the horizontal direction; alpha is the included angle between the main air pipe of the inverted L-shaped directional air cap and the central line of the nozzle pipe; d is the pipe diameter of the inverted L-shaped directional hood; delta is the wall thickness of the L-shaped directional hood; and x is the length of the nozzle pipe of the inverted L-shaped directional blast cap.
The invention is also characterized in that: the included angle beta between the outlet direction of the blast cap nozzle pipe and the descending direction of the inclined air distribution plate accords with the following formula:
in the formula, delta y is the horizontal distance between two adjacent rows of inverted L-shaped directional hoods which are vertical to the descending direction of the inclined air distribution plate in the horizontal direction; delta x is the horizontal distance between two adjacent rows of directional hoods along the descending direction of the inclined wind distribution plate; d is the pipe diameter of the inverted L-shaped directional hood; delta is the wall thickness of the L-shaped directional hood.
The invention is also characterized in that: the included angle alpha between the main air pipe of the inverted L-shaped directional blast cap and the central line of the nozzle pipe is between (90 degrees-theta) and 90 degrees.
The invention has the following advantages and prominent technical effects: (a) Experimental research shows that high-speed air sprayed out of the rear exhaust hood can blow through the top of the front exhaust hood by selecting the technical scheme of the invention, so that impact abrasion behind the hood is greatly improved, and the improvement of fluidization uniformity in a furnace and the operation period of the boiler are facilitated. (b) After the height difference exists between the inverted L-shaped directional blast caps, fluidized air sprayed out of the rear exhaust cap directly enters the hearth, so that the disturbance at the bottom of the bed layer can be enhanced, and the particle mixing is facilitated. (c) The inverted L-shaped directional hood is in a step shape, has stronger directional blowing capability and is beneficial to discharging heavy large particles.
Drawings
Fig. 1 is a schematic structural view of a sheet-shaped stepped air distribution device of a circulating fluidized bed boiler according to the present invention.
FIG. 2 is a top view of an inclined grid with an "L" shaped directional cowl.
Fig. 3 is an enlarged view of a portion a of fig. 1.
Fig. 4 is an enlarged view of a portion B of fig. 2.
Fig. 5 is a schematic partial structure diagram of the stepped air distribution device.
In the figure: 1-hearth; 2-inclined air distribution plate; 3- "gamma" shape directional hood; 4-an air chamber; 5-blast cap spout pipe; 6-a sheet-like structure; 7-blast cap main air pipe.
Detailed Description
The principles, specific structure and embodiments of the present invention are further described below in conjunction with the appended drawings.
Fig. 1 is a schematic structural view of a sheet-shaped step-type air distribution device of a circulating fluidized bed boiler of the present invention, and fig. 2 is a top view of an inclined air distribution plate on which a "Γ" -shaped directional hood is arranged, which shows that the "Γ" -shaped directional hood 3 is stepped in a height direction and has a sheet-shaped structure in a horizontal direction. The air distribution device comprises an air chamber 4, an inclined air distribution plate 2 and a reverse L-shaped directional air cap 3 arranged on the inclined air distribution plate 2, wherein a main air pipe 7 of the air cap is vertically arranged on the inclined air distribution plate 2; the same row of the inverted L-shaped directional air hoods 3 are arranged on the same straight line and show a sheet-shaped structure, and the inverted L-shaped directional air hoods are distributed on the inclined air distribution plate in a two-dimensional array (as shown in figure 2); the inverted L-shaped directional blast cap consists of a blast cap main air pipe 7 and a blast cap nozzle pipe 5.
As shown in fig. 3, 4 and 5, the wind distribution device mainly includes two components: an inclined air distribution plate 2 and a reversed L-shaped directional air cap 3. The parameters involved in the calculation are: an included angle theta between the inclined air distribution plate 2 and the horizontal direction, an included angle alpha between a main air pipe 7 of the air cap and the central line of an air cap spout pipe 5, a pipe diameter d of the inverted L-shaped directional air cap 3, a wall surface thickness delta of the inverted L-shaped directional air cap 3, a length x of the air cap spout pipe 5, a horizontal distance delta x between two adjacent rows of directional air caps in the descending direction of the inclined air distribution plate 2, a height difference delta z between the front row of directional air caps and the rear row of directional air caps in the descending direction of the inclined air distribution plate 2, and a horizontal distance delta y between the left row of inverted L-shaped directional air caps 3 which are perpendicular to the descending direction of the inclined air distribution plate 2 in the horizontal direction.
The height difference delta h of two adjacent rows of inverted L-shaped directional hoods 3 along the descending direction of the inclined air distribution plate 2 caused by the inclination angle theta of the inclined air distribution plate 2 1 Comprises the following steps:
Δh 1 ＝Δx×tan(θ) (1)
when high-speed wind ejected by the rear row inverted L-shaped directional blast caps 3 in the two adjacent rows of blast caps along the descending direction of the inclined blast distribution plate 2 reaches the outlet of the nozzle pipe of the front row blast cap, the displacement delta h of the fluidized wind in the z direction is caused by the included angle alpha between the main blast pipe 7 of the blast cap and the central line of the nozzle pipe 5 of the blast cap 2 ：
Δh 2 ＝(x+Δx)×tan(90°-a) (2)
The problem to be solved by the invention is that the high-speed wind ejected from the nozzle orifice of the rear row of inverted L-shaped directional blast caps cannot abrade the back and the top of the front row of blast caps, namely:
Δh 1 ≥Δh 2 +Δz，Δz＝d+δ (3)
as shown in fig. 5, the horizontal distance Δ x between two adjacent rows of directional hoods in the descending direction of the inclined grid plate 2 should satisfy the relations obtained by the expressions (1), (2) and (3):
the horizontal distance delta x between two adjacent rows of inverted L-shaped directional hoods 3, the included angle theta between the inclined air distribution plate 2 and the horizontal direction, the included angle alpha between the main air pipe 7 of the hood and the central line of the nozzle pipe 5 of the hood, the pipe diameter d of the inverted L-shaped directional hood 3, the wall thickness delta of the inverted L-shaped directional hood 3 and the length x of the nozzle pipe 5 of the hood are in a mutually restricted relationship, and any one parameter can be optimized according to other parameters. For example, the structure of the inverted L-shaped directional blast cap 3 and the arrangement mode of the blast distribution plates are determined, namely the included angle theta between the inclined blast distribution plates 2 and the horizontal direction, the included angle alpha between the blast cap main air pipe 7 and the central line of the blast cap nozzle pipe 5, the pipe diameter d of the inverted L-shaped directional blast cap 3, the wall thickness delta of the inverted L-shaped directional blast cap 3 and the length x of the blast cap nozzle pipe 5 are determined, and the horizontal distance delta x between two adjacent rows of the inverted L-shaped directional blast caps 3 can be preferably selected.
In consideration of the problem of slag leakage of the air chamber, the included angle alpha between the nozzle pipe of the inverted L-shaped directional blast cap and the main blast pipe 7 of the blast cap is not more than 90 degrees, namely alpha is not more than 90 degrees; considering that the high-speed air coming out of the nozzle pipe of the inverted L-shaped directional blast cap can not impact and wear the air distribution plate, the included angle alpha between the blast cap nozzle pipe 5 and the blast cap main air pipe 7 is larger than 90 degrees to theta, namely alpha is larger than or equal to 90 degrees to theta, namely the included angle alpha between the inverted L-shaped directional blast cap main air pipe and the central line of the blast cap nozzle pipe is between 90 degrees to theta and 90 degrees; considering the difficulty of slag discharge, under the condition of not generating impact abrasion to the surrounding blast caps, an included angle between the nozzle pipe of the inverted L-shaped directional blast cap and the x direction is allowed, as shown in FIG. 4, an included angle beta between the outlet direction of the nozzle pipe 5 of the blast cap and the descending direction of the inclined air distribution plate 2 is in accordance with the following formula:
the preferred embodiments of the wind distribution device of the present invention are described in detail above with reference to the drawings and calculation, and the specific technical parameters in the above embodiments can be determined by any suitable method without contradiction.
Claims (2)
1. The utility model provides a slice notch cuttype wind distribution device of circulating fluidized bed boiler, the device includes plenum (4), slope grid (2) and arranges "gamma" shape directional hood (3) on slope grid (2), and "gamma" shape directional hood comprises hood main air pipe (7) and hood nozzle pipe (5), its characterized in that: the blast cap main air pipe (7) is vertically arranged on the inclined air distribution plate (2); the inverted L-shaped directional hoods (3) are distributed on the inclined wind distribution plate (2) in a two-dimensional array, and the horizontal distance delta x between two adjacent rows of directional hoods along the descending direction of the inclined wind distribution plate conforms to the following formula:
in the above formula, θ is an included angle θ between the inclined air distribution plate and the horizontal direction; alpha is the included angle between the main air pipe of the inverted L-shaped directional air cap and the central line of the nozzle pipe; d is the pipe diameter of the inverted L-shaped directional hood; delta is the wall thickness of the L-shaped directional hood; x is the length of a nozzle pipe of the inverted L-shaped directional blast cap;
the included angle beta between the outlet direction of the blast cap nozzle pipe (5) and the descending direction of the inclined air distribution plate (2) accords with the following formula:
in the formula, delta y is the horizontal distance between two adjacent rows of inverted L-shaped directional hoods which are vertical to the descending direction of the inclined air distribution plate in the horizontal direction; delta x is the horizontal distance between two adjacent rows of directional hoods along the descending direction of the inclined wind distribution plate; d is the pipe diameter of the inverted L-shaped directional hood; delta is the wall thickness of the L-shaped directional hood.
2. The stepped laminar air distribution device of a circulating fluidized bed boiler according to claim 1, wherein the angle α between the main hood air duct (7) and the centerline of the nozzle pipe (5) of the hood is between (90 ° - θ) and 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710476285.XA CN107036085B (en) | 2017-06-21 | 2017-06-21 | Slice notch cuttype air distribution device of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710476285.XA CN107036085B (en) | 2017-06-21 | 2017-06-21 | Slice notch cuttype air distribution device of circulating fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107036085A CN107036085A (en) | 2017-08-11 |
| CN107036085B true CN107036085B (en) | 2022-12-23 |
Family
ID=59542551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710476285.XA Active CN107036085B (en) | 2017-06-21 | 2017-06-21 | Slice notch cuttype air distribution device of circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107036085B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344247A (en) * | 2008-08-07 | 2009-01-14 | 上海交通大学 | Side-placed arrow type fluidized bed hood |
| CN101614400A (en) * | 2009-07-31 | 2009-12-30 | 北京热华能源科技有限公司 | A kind of fluidized selective deslagging device |
| EP2759767A1 (en) * | 2013-01-25 | 2014-07-30 | Alstom Technology Ltd | A reactor chamber for a circulating fluidized bed boiler |
| CN105927972A (en) * | 2016-05-10 | 2016-09-07 | 北京热华能源科技有限公司 | Wind distribution device facilitating discharging of big particle matter and multi-flow circulating fluidized bed boiler |
| CN206018608U (en) * | 2016-09-12 | 2017-03-15 | 贵州新能源开发投资股份有限公司 | A kind of loosening wind structure of CFBB inertia separator returning charge passage |
-
2017
- 2017-06-21 CN CN201710476285.XA patent/CN107036085B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344247A (en) * | 2008-08-07 | 2009-01-14 | 上海交通大学 | Side-placed arrow type fluidized bed hood |
| CN101614400A (en) * | 2009-07-31 | 2009-12-30 | 北京热华能源科技有限公司 | A kind of fluidized selective deslagging device |
| EP2759767A1 (en) * | 2013-01-25 | 2014-07-30 | Alstom Technology Ltd | A reactor chamber for a circulating fluidized bed boiler |
| CN105927972A (en) * | 2016-05-10 | 2016-09-07 | 北京热华能源科技有限公司 | Wind distribution device facilitating discharging of big particle matter and multi-flow circulating fluidized bed boiler |
| CN206018608U (en) * | 2016-09-12 | 2017-03-15 | 贵州新能源开发投资股份有限公司 | A kind of loosening wind structure of CFBB inertia separator returning charge passage |
Non-Patent Citations (1)
| Title |
|---|
| 410t/h循环流化床锅炉风帽改造;郭志兵;《河北电力技术》;20110625(第03期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107036085A (en) | 2017-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101368732B (en) | Refuse incineration processing equipment and method | |
| CN105090980A (en) | Spiral-flow type fluidized bed incinerator | |
| CN104279556A (en) | Secondary air distribution method for circulating fluidized bed boiler | |
| CN207762914U (en) | A kind of fluid bed solids trash burner | |
| CN104990086B (en) | A kind of fluidized bed refuse incinerator | |
| CN102966959B (en) | Wall-attached air system for preventing high temperature corrosion of water cooled wall of garbage incinerator | |
| CN109268855A (en) | The slagging structure of single air compartment differential biomass fuel circulating fluidized bed boiler | |
| CN107036085B (en) | Slice notch cuttype air distribution device of circulating fluidized bed boiler | |
| CN211600710U (en) | Integrated fluidized bed garbage high-efficiency gasification combustion furnace | |
| CN215294894U (en) | Discharge device for reducing carbon content in boiler bottom slag | |
| CN110925774A (en) | Strong turbulence combustion system for reducing CO and NOx | |
| CN214536193U (en) | Secondary air device for inhibiting CO generation amount of garbage incinerator | |
| CN205504997U (en) | Dual -purpose cremator of oil gas of oxygen boosting multiple spot burning | |
| CN201225624Y (en) | Garbage cremator | |
| CN107020006A (en) | A kind of gas cleaning reactor and flue gas purification system | |
| CN202993228U (en) | Wall-attaching air system preventing high temperature corrosion of water wall of garbage incinerator | |
| CN218583140U (en) | Hidden hood type multi-step circulating fluidized bed surface structure | |
| CN111879118A (en) | Anti-blocking type heating furnace for metal smelting | |
| CN207196479U (en) | A kind of sheet step type air-distribution device of CFBB | |
| CN110762518A (en) | Fluidized bed furnace structure suitable for mixed combustion | |
| CN205299544U (en) | Scattered mechanism of qi of cloth tuber pipe formula fluidization constructs | |
| CN205939114U (en) | High -efficient environmental protection circulating fluidized bed burner | |
| CN201225638Y (en) | Flue gas processing device of garbage furnace | |
| CN105972584B (en) | A kind of high-efficiency environment friendly burning device of circulating fluidized bed and its combustion method | |
| CN218763419U (en) | Flue gas circulating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |