CN111336505A - Variable-resistance energy-saving hood - Google Patents
Variable-resistance energy-saving hood Download PDFInfo
- Publication number
- CN111336505A CN111336505A CN202010259673.4A CN202010259673A CN111336505A CN 111336505 A CN111336505 A CN 111336505A CN 202010259673 A CN202010259673 A CN 202010259673A CN 111336505 A CN111336505 A CN 111336505A
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- China
- Prior art keywords
- inner cover
- core pipe
- variable
- air
- resistance
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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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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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
According to the variable-resistance energy-saving blast cap provided by the invention, the inner cover is movably sleeved on the core pipe, so that the size of a gap between the inner cover and the core pipe can be realized when primary air is introduced, when the low-load operation is carried out, the introduced primary air volume is smaller, at the moment, the gap between the inner cover and the core pipe is smaller, and the resistance generated when air flows through is larger, so that the uniform air distribution of a plurality of blast caps is realized when the air volume is small; when the high-load running is carried out, the amount of introduced primary air is large, at the moment, the gap between the inner cover and the core pipe is large, the resistance generated when airflow flows through is reduced, and therefore the energy consumption of the fan is reduced when the high load is carried out; therefore, the invention can realize the uniform air distribution of low-load small air quantity, reduce the over-oxygen amount and reduce the NOx emission; high load, large air quantity, small resistance and uniform air distribution, reduces the energy consumption of a fan and improves the boiler efficiency.
Description
Technical Field
The invention belongs to the field of circulating fluidized bed boilers, and particularly relates to a variable-resistance energy-saving hood.
Background
The resistance and the structural form of the air distribution plate hood of the circulating fluidized bed boiler have great influence on the fluidization of bed materials and the operation economy of the boiler. The proper resistance can ensure that the air quantity passing through the blast cap is uniformly distributed, thereby ensuring that the furnace is uniformly fluidized and avoiding the phenomena of poor local fluidization and high temperature; from the aspect of fluidization wind distribution uniformity, the larger the resistance is, the more suitable the resistance is, but the larger the resistance is, the larger the primary wind pressure loss is, the larger the primary fan current is, and the larger the boiler operation energy consumption is.
At present, the conventional air cap is designed into a fixed structure, the resistance of the air cap is in direct proportion to the square of the air quantity, so that the air quantity is large in high load, the resistance of the air cap is large, the air quantity is small in low load, and the resistance of the air cap is small. During peak shaving of a power plant boiler, the boiler is required to operate under low load, primary air is excessive at low load of the boiler to ensure fluidization, and NOx emission is increased at low load due to excessive oxygen. The current blast cap can not well solve the problem of contradiction between fluidization uniformity (blast cap resistance) and excessive oxygen amount of low-load materials.
Disclosure of Invention
The invention aims to provide a variable-resistance energy-saving blast cap, which solves the problem that the existing blast cap cannot well solve the contradiction between the fluidization uniformity and the peroxide amount of low-load materials.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a variable-resistance energy-saving blast cap which comprises an outer cover, an inner cover and a core pipe, wherein the outer cover is sleeved on the inner cover, and the inner cover is movably sleeved on the core pipe; the core pipe is arranged on the air distribution plate, and the air distribution plate, the core pipe and the inner cover are communicated; when primary air is introduced, a gap with the size capable of being automatically adjusted is formed between the inner cover and the core pipe; when no primary wind exists, the inner cover is contacted with the top of the core pipe.
Preferably, the top of the inner cavity of the inner cover is in a conical structure.
Preferably, a gap is arranged between the side edge of the top of the core tube and the side wall of the conical top of the inner cover; a channel is arranged between the top of the core pipe and the bottom of the inner cover.
Preferably, a turning gap is arranged between the bottom of the inner cover and the air distribution plate.
Preferably, the side wall of the outer cover is provided with a hood hole, and the hood hole is arranged along the circumferential direction of the outer cover.
Preferably, the air outlet of the hood hole is arranged obliquely downwards.
Preferably, the top of the housing is provided with a recess for accumulating bed material during operation.
Compared with the prior art, the invention has the beneficial effects that:
according to the variable-resistance energy-saving blast cap provided by the invention, the inner cover is movably sleeved on the core pipe, so that the size of a gap between the inner cover and the core pipe can be realized when primary air is introduced, when the low-load operation is carried out, the introduced primary air volume is smaller, at the moment, the gap between the inner cover and the core pipe is smaller, and the resistance generated when air flows through is larger, so that the uniform air distribution of a plurality of blast caps is realized when the air volume is small; when the high-load running is carried out, the amount of introduced primary air is large, at the moment, the gap between the inner cover and the core pipe is large, the resistance generated when airflow flows through is reduced, and therefore the energy consumption of the fan is reduced when the high load is carried out; therefore, the invention can realize the uniform air distribution of low-load small air quantity, reduce the over-oxygen amount and reduce the NOx emission; the high-load, large-air-volume and small-resistance uniform air distribution reduces the energy consumption of the fan and improves the boiler efficiency; further solves the problem of contradiction between fluidization uniformity (blast cap resistance) and peroxide amount of low-load materials, and simultaneously solves the problems of overlarge high load resistance and overhigh energy consumption.
Drawings
FIG. 1 is a schematic structural view of a variable-resistance energy-saving hood according to the present invention;
FIG. 2 is a view showing the arrangement of a gap between an inner cover and a core pipe according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the variable-resistance energy-saving hood provided by the invention comprises an outer cover 1, an inner cover 2, a core pipe 3 and a hood hole 4, wherein the outer cover 1 is sleeved on the inner cover 2, and the inner cover 2 is sleeved on the core pipe 3.
The side wall of the outer cover 1 is provided with a wind cap hole 4, and the wind cap hole 4 is arranged along the circumferential direction of the outer cover 1.
An inclination angle is arranged between the axis of the blast cap hole 4 and the side wall of the outer cover, the inclination angle is 10-45 degrees, and the inclination angle is arranged to reduce the opposite-blowing abrasion effect between the blast caps and ensure that bed materials at the lower part of the blast caps are better fluidized.
The top of the outer cover 1 is provided with a groove for storing bed materials during operation, so that abrasion is prevented.
The top of the inner cover 2 is of a conical structure, and the inner cover 2 is guided and positioned through the conical structure.
A gap a is formed between the top of the core tube 3 and the side wall of the conical top of the inner cover 2; a passage b is provided between the top of the core tube 3 and the bottom of the inner cover 2.
A turning gap c is arranged between the bottom of the inner cover 2 and the air distribution plate, primary air passes through the core pipe 3, the gap a, the channel b and the turning gap c in sequence, and is finally sprayed out of the hood from the hood hole 4.
The uniform air distribution with low load and small air quantity is realized through the clearance a, the channel b and the steering clearance c.
The core tube 3 is welded on the grid plate 5.
The outer cover 1 is buckled on the air distribution plate 5.
The working principle of the invention is as follows:
when no load is applied, the inner cover 2 is in contact with the top side of the core tube 3.
When having load, wind once flows through the top of core pipe 3 until inner cover 2 through air distribution plate 5, overcomes the gravity of inner cover 2 by wind energy for produce the clearance between inner cover 2 and the core pipe 3, wind once flows through clearance an, the passageway b between inner cover 2 and the 3 top sides of core pipe, and through turning to clearance c, finally flows out hood hole 4, specifically:
when the load is low load, because the clearance a, the channel b and the steering clearance c are all small, the resistance generated when the airflow flows through is large, and therefore the uniform air distribution of a plurality of air caps is realized when the air volume is small;
when the load is high load, the clearance a, the channel b and the turning clearance c are all enlarged, so that resistance generated when the airflow flows through is reduced, and the energy consumption of the fan is reduced when the load is high.
Therefore, the invention can realize the uniform air distribution of low-load small air quantity, reduce the over-oxygen amount and reduce the NOx emission; high load, large air quantity, small resistance and uniform air distribution, reduces the energy consumption of a fan and improves the boiler efficiency.
The above description is intended to illustrate an embodiment of the present invention, but the present invention is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. All changes and modifications that come within the scope of the invention are desired to be protected.
Claims (7)
1. A resistance-variable energy-saving hood is characterized by comprising an outer cover (1), an inner cover (2) and a core pipe (3), wherein the outer cover (1) is sleeved on the inner cover (2), and the inner cover (2) is movably sleeved on the core pipe (3); the core pipe (3) is arranged on the air distribution plate, and the air distribution plate, the core pipe (3) and the inner cover (2) are communicated; when primary air is introduced, a gap with the size capable of being automatically adjusted is formed between the inner cover (2) and the core pipe (3); when no primary wind exists, the inner cover (2) is contacted with the top of the core pipe (3).
2. A variable-resistance energy-saving hood as claimed in claim 1, wherein the top of the inner cavity of the inner cover (2) is conical.
3. A variable-resistance energy-saving hood according to claim 2, characterized in that a gap (a) is arranged between the side edge of the top of the core tube (3) and the side wall of the conical top of the inner cover (2); a channel (b) is arranged between the top of the core pipe (3) and the bottom of the inner cover (2).
4. A variable-resistance energy-saving hood according to claim 3, characterized in that a turning gap (c) is arranged between the bottom of the inner cover (2) and the wind distribution plate.
5. A variable-resistance energy-saving hood according to claim 1, characterized in that the side wall of the outer cover (1) is provided with hood holes (4), and the hood holes (4) are arranged along the circumferential direction of the outer cover (1).
6. A variable-resistance energy-saving hood according to claim 5, wherein the air outlet of the hood hole (4) is arranged obliquely downwards.
7. A variable resistance energy saving hood according to claim 1 characterized in that the top of the outer cover (1) is provided with a groove (101) for storing bed material during operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010259673.4A CN111336505A (en) | 2020-04-03 | 2020-04-03 | Variable-resistance energy-saving hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010259673.4A CN111336505A (en) | 2020-04-03 | 2020-04-03 | Variable-resistance energy-saving hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111336505A true CN111336505A (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010259673.4A Pending CN111336505A (en) | 2020-04-03 | 2020-04-03 | Variable-resistance energy-saving hood |
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| Country | Link |
|---|---|
| CN (1) | CN111336505A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983456A (en) * | 2021-12-02 | 2022-01-28 | 重庆大学 | CFB air distribution plate bell-type hood with adjustable resistance characteristic |
-
2020
- 2020-04-03 CN CN202010259673.4A patent/CN111336505A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983456A (en) * | 2021-12-02 | 2022-01-28 | 重庆大学 | CFB air distribution plate bell-type hood with adjustable resistance characteristic |
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