CN220186804U - Pulverized coal combustion device - Google Patents
Pulverized coal combustion device Download PDFInfo
- Publication number
- CN220186804U CN220186804U CN202321945704.7U CN202321945704U CN220186804U CN 220186804 U CN220186804 U CN 220186804U CN 202321945704 U CN202321945704 U CN 202321945704U CN 220186804 U CN220186804 U CN 220186804U
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- inner shell
- pulverized coal
- air
- shell
- cavity
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 50
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a pulverized coal combustion device, which relates to the field of combustion equipment, and comprises a pulverized coal burner and a pilot cap arranged at the front end of the pulverized coal burner, wherein the pulverized coal burner comprises an outer shell, an inner shell, an igniter, an air inlet channel and a feeding channel, an interlayer between the inner shell and the outer shell is an air cavity, the front end of the inner shell is fixedly connected with the front end of the outer shell through an annular plate, and a plurality of air blowing holes for communicating the inner cavity of the pilot cap with the air cavity are arranged on the annular plate; a plurality of air injection holes for communicating the combustion chamber with the air cavity are formed in the inner shell; when the device works, secondary air in the air cavity is blown into the inner cavity of the ignition cover through a plurality of air blowing holes on the annular plate, and the inner wall surface of the ignition cover is continuously purged and cooled, so that the service life is prolonged; the pulverized coal and air are fully and uniformly mixed, the pulverized coal is thoroughly combusted, and the combustion efficiency is high; the pulverized coal combustion device has the advantages of few component parts, simple structure and low manufacturing cost.
Description
Technical Field
The utility model relates to the technical field of combustion equipment, in particular to a pulverized coal combustion device.
Background
The pulverized coal burner is equipment for generating high-temperature vortex by combusting pulverized coal in a short time, and is widely applied to boilers, material dryers, various annealing furnaces, metal heating furnaces, quenching furnaces, precision casting shell burning furnaces, smelting furnaces, forging furnaces, rotary kilns, other heating furnaces and the like.
For example, the Chinese patent publication No. CN212842632U, named material dryer and its feeding port, has a igniting hood in the front end of the burner, and the flame from the burner is led into the drying drum via the igniting hood to dry the material.
Although the purpose of drying materials is achieved, the defects of the prior art are that the ignition cover is made of heat-resistant castable and is close to the combustion chamber, and in the working process, the ignition cover is continuously baked at high temperature while achieving the ignition function, is easy to damage due to thermal stress, reduces the service life of the ignition cover, and influences the normal operation of drying equipment.
Disclosure of Invention
In view of this, the technical problems to be solved by the present utility model are: the pulverized coal combustion device has the advantages of prolonging the service life of the ignition cover, along with simple structure and low manufacturing cost.
In order to solve the technical problems, the technical scheme of the utility model is as follows: the pulverized coal combustion device comprises a pulverized coal burner and a igniting cover arranged at the front end of the pulverized coal burner, wherein the pulverized coal burner comprises an outer shell, an inner shell, an igniter, an air inlet channel and a feeding channel;
the inner shell is fixedly arranged in the outer shell, an interlayer between the inner shell and the outer shell is an air cavity, the inner shell comprises an inner shell front section, an inner shell transition section and an inner shell rear section which are sequentially arranged, the cross section size of the inner shell front section is larger than that of the inner shell rear section, the inner shell front section and the inner shell transition section enclose a combustion chamber, the ignition end of the igniter stretches into the combustion chamber, a plurality of air spraying holes are formed in the inner shell, and the combustion chamber is communicated with the air cavity through the air spraying holes;
the front end of the front section of the inner shell is fixedly connected with the front end of the outer shell through an annular plate, a plurality of air blowing holes are formed in the annular plate, and the air blowing holes are used for communicating the inner cavity of the ignition cover with the air cavity;
the air inlet channel is connected with the shell and communicated with the air cavity;
the feed channel penetrates through the outer shell and is connected with the rear section of the inner shell, and the feed channel is communicated with the inner cavity of the inner shell.
Wherein the rear end of the inner cavity of the ignition cover is arranged in a flaring shape.
Wherein the front end of the front section of the inner shell is in a closing shape.
After the technical scheme is adopted, the beneficial effects of the utility model are as follows:
the pulverized coal combustion device comprises a pulverized coal burner and a igniting cover arranged at the front end of the pulverized coal burner, wherein the pulverized coal burner comprises an outer shell, an inner shell, an igniter, an air inlet channel and a feeding channel, an interlayer between the inner shell and the outer shell is an air cavity, the inner shell comprises an inner shell front section, an inner shell transition section and an inner shell rear section which are sequentially arranged, the cross section size of the inner shell front section is larger than that of the inner shell rear section, the inner shell front section and the inner shell transition section enclose a combustion chamber, the ignition end of the igniter stretches into the combustion chamber, and a plurality of air injection holes for communicating the combustion chamber with the air cavity are formed in the inner shell; the front end of the front section of the inner shell is fixedly connected with the front end of the outer shell through an annular plate, and a plurality of air blowing holes are formed in the annular plate and communicate the inner cavity of the ignition cover with the air cavity; when the coal powder and air burner works, the mixture of coal powder and air (namely primary air) enters the inner cavity of the inner shell through the feeding channel, is sprayed into the combustion chamber from the rear section of the inner shell forwards, and is burnt after encountering the flame of the igniter; meanwhile, secondary air enters the air cavity through the air inlet channel and is sprayed into the combustion chamber through the air injection holes on the inner shell, and the secondary air blows to pulverized coal in the combustion chamber to have disturbance and combustion supporting effects on the pulverized coal, so that the pulverized coal and the air are fully and uniformly mixed, the pulverized coal is thoroughly combusted, and the combustion efficiency is high; meanwhile, secondary air in the air cavity is blown into the inner cavity of the ignition cover through a plurality of air blowing holes in the annular plate, and continuously sweeps and cools the inner wall surface of the ignition cover, so that the influence caused by thermal stress is reduced, the service life of the ignition cover can be prolonged, and the normal operation of drying equipment is facilitated. And the whole pulverized coal combustion device has fewer component parts, simple structure and low manufacturing cost.
Drawings
FIG. 1 is a schematic view of a pulverized coal burner according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a pulverized coal burner according to a second embodiment of the present utility model;
FIG. 3 is a schematic view of a pulverized coal burner according to a third embodiment of the present utility model;
FIG. 4 is a schematic diagram of a pulverized coal burner according to a fourth embodiment of the present utility model;
in the figure: 100-pulverized coal burner; 200-igniting cover; 201-flaring the inner cavity of the ignition cover;
1-a housing; 10-an annular plate; 10 a-a gas vent; 11-a housing front section; 12-a shell transition section; 13-the rear section of the housing; 2-an inner shell; 21-an inner shell front section; 21 a-a front section gas injection hole of the inner shell; 211-closing up the front section of the inner shell; 221-an inner shell sloped transition section; 222-an inner shell vertical transition section; 222 a-inner shell vertical transition section gas injection holes; 3-igniter; 4-a feed channel; 5-an air inlet channel; a-an air cavity; b-combustion chamber; c-inner cavity of igniting cover.
Closed arrows indicate material flow direction, and non-closed arrows indicate secondary air flow direction.
Detailed Description
The utility model is described in further detail below, without limitation, in connection with the accompanying drawings and examples.
For convenience of description, the direction of the flame is defined as "front" and the direction opposite to "front" is defined as "rear" along the axial direction of the pulverized coal combustion device.
Example 1
As shown in fig. 1, the pulverized coal combustion apparatus according to the first embodiment of the present utility model includes a pulverized coal burner 100 and a pilot cap 200 provided at a front end of the pulverized coal burner 100.
Wherein, the igniting cover 200 is a casting product made by casting of temperature resistant casting materials. Further, the rear end of the inner cavity of the ignition cover 200 is provided as an inner cavity flaring 201 of the ignition cover, and is in a horn shape.
The pulverized coal burner 100 includes an outer case 1, an inner case 2, an igniter 3, a feed channel 4, and an air intake channel 5.
The shell 1 comprises a shell front section 11, a shell transition section 12 and a shell rear section 13 which are sequentially arranged, wherein the cross section size of the shell front section 11 is larger than that of the shell rear section 13, and the rear end of the shell rear section 13 is closed.
Wherein, inner shell 2 is fixed to be set up in the inside of shell 1, with the basic adaptation of shell 1 shape, the intermediate layer between inner shell 2 and the shell 1 is air chamber A, inner shell 2 is including the inner shell anterior segment 21 that sets gradually, the inner shell changeover portion, inner shell back end 23, and the cross sectional dimension of inner shell anterior segment 21 is greater than the cross sectional dimension of inner shell back end 23, inner shell anterior segment 21, the inner shell changeover portion encloses into combustion chamber B, the rear end of some firearm 3 runs through the rear end of inner shell 2, the firing end of some firearm 3 stretches into combustion chamber B, be provided with a plurality of fumaroles on the inner shell 2, fumaroles communicate combustion chamber B with air chamber A.
Wherein, the front end of the inner shell front section 21 and the front end of the outer shell front section 11 are fixedly connected through an annular plate 10, and a plurality of air blowing holes 10a are arranged on the annular plate 10, and the air blowing holes 10a are used for communicating the inner cavity C of the ignition cover with the air cavity A.
Wherein the gas injection holes on the inner shell 2 comprise a plurality of inner shell front section gas injection holes 21a arranged on the inner shell front section 21. The secondary air is injected from the outer periphery to the center of the combustion chamber B through a plurality of inner shell front section air injection holes 21a to form radial air, the pulverized coal is stirred, the pulverized coal and the air are uniformly mixed, the combustion supporting effect is achieved on the pulverized coal, and the combustion efficiency is improved.
Wherein, the inner shell changeover portion includes inner shell inclined changeover portion 221 and inner shell vertical changeover portion 222, and the one end of inner shell vertical changeover portion 222 is connected with the front end of inner shell back section 23, and the other end of inner shell vertical changeover portion 222 is connected with the rear end of inner shell inclined changeover portion 221, and the front end of inner shell inclined changeover portion 221 is connected with the rear end of inner shell front section 21. The gas orifices on the inner shell 2 also include a plurality of inner shell vertical transition section gas orifices 222a disposed on the inner shell vertical transition section 222. The secondary air is sprayed into the combustion chamber B from back to front through a plurality of air spraying holes 222a of the vertical transition section of the inner shell to form axial air, and the pulverized coal is stirred, so that the pulverized coal and the air are fully and uniformly mixed.
Wherein the feed channel 4 penetrates the outer shell 1 and is connected with the rear section 23 of the inner shell, the feed channel 4 is communicated with the inner cavity of the inner shell 2, and the feed channel 4 is used for being connected with a pulverized coal conveying fan, such as a Roots blower.
Wherein an air inlet channel 5 is connected to the housing 1 and communicates with the air chamber a, the air inlet channel 5 being adapted to be connected to a blower device, such as a blower.
When in operation, the mixture of coal dust and air (namely primary air) enters the inner cavity of the inner shell 2 through the feeding channel 4, is sprayed into the combustion chamber B from the rear section of the inner shell to the front, and is burnt after encountering the flame of the igniter 3; meanwhile, secondary air enters an air cavity A through an air inlet channel 5 and is sprayed into a combustion chamber B through an air injection hole on the inner shell 2, and the secondary air blows to pulverized coal in the combustion chamber to have disturbance and combustion supporting effects on the pulverized coal, so that the pulverized coal and air are fully and uniformly mixed, the pulverized coal is thoroughly combusted, and the combustion efficiency is high; meanwhile, secondary air in the air cavity A enters the inner cavity C of the ignition cover along the flaring 201 of the inner cavity of the ignition cover through the plurality of air blowing holes 10a on the annular plate 10, continuously sweeps and cools the inner wall surface of the ignition cover, reduces the influence caused by thermal stress, and further prolongs the service life of the ignition cover, and is beneficial to the normal operation of drying equipment. The design of the flaring 201 of the inner cavity of the ignition cover is beneficial to smoothly guiding secondary air in the air cavity A into the ignition cover through the air blowing holes 10a and leading along the wall surface of the inner cavity of the ignition cover to blow and cool the wall surface of the inner cavity of the ignition cover; on the other hand, the flame of the combustion chamber B can smoothly enter the inner cavity C of the ignition cover and is guided forward.
Example two
As shown in fig. 2, the pulverized coal combustion apparatus according to the second embodiment of the present utility model is basically the same as that of the first embodiment, except that: the front end of the inner shell front section 21 is set to be in a closed state, namely, the front end of the inner shell front section 21 is connected with an inner shell front section closing-in 211, the radial size of the front end of the inner shell front section closing-in 211 is smaller than that of the rear end of the inner shell front section closing-in 211, and the inner shell front section is in a cone shape with small front and large rear; the closing-in structure plays a role in avoiding on one hand, and creates conditions for blowing external wind in the air cavity A into the inner cavity C of the ignition cover through the air blowing holes 10a on the annular plate 10; on the other hand, compared with the first embodiment, the combustion chamber B can be made to have a larger combustion chamber volume without changing the outer dimensions of the burner.
Example III
As shown in fig. 3, the pulverized coal combustion apparatus according to the third embodiment of the present utility model is basically the same as that of the first embodiment, except that: the inner wall surface of the ignition cover 200 is designed as an inner cylindrical surface, and the outer diameter of the ignition cover 200 is substantially the same as the outer diameter of the annular plate 10, and is larger than the outer diameter of the housing front section 11 of the pulverized coal burner 100.
Example IV
As shown in fig. 4, the pulverized coal burner of the fourth embodiment of the present utility model is basically the same as that of the second embodiment, except that: the inner wall surface of the ignition cover 200 is designed as an inner cylindrical surface, and the outer diameter of the ignition cover 200 is substantially the same as the outer diameter of the annular plate 10, and is larger than the outer diameter of the housing front section 11 of the pulverized coal burner 100.
The foregoing is illustrative of the preferred embodiments of the present utility model, and all parts not specifically mentioned are known in the art, and the scope of the present utility model is defined by the appended claims.
Claims (3)
1. The pulverized coal combustion device comprises a pulverized coal burner and a igniting cover arranged at the front end of the pulverized coal burner, and is characterized in that the pulverized coal burner comprises an outer shell, an inner shell, an igniter, an air inlet channel and a feeding channel;
the inner shell is fixedly arranged in the outer shell, an interlayer between the inner shell and the outer shell is an air cavity, the inner shell comprises an inner shell front section, an inner shell transition section and an inner shell rear section which are sequentially arranged, the cross section size of the inner shell front section is larger than that of the inner shell rear section, the inner shell front section and the inner shell transition section enclose a combustion chamber, the ignition end of the igniter stretches into the combustion chamber, a plurality of air spraying holes are formed in the inner shell, and the combustion chamber is communicated with the air cavity through the air spraying holes;
the front end of the front section of the inner shell is fixedly connected with the front end of the outer shell through an annular plate, a plurality of air blowing holes are formed in the annular plate, and the air blowing holes are used for communicating the inner cavity of the ignition cover with the air cavity;
the air inlet channel is connected with the shell and communicated with the air cavity;
the feed channel penetrates through the outer shell and is connected with the rear section of the inner shell, and the feed channel is communicated with the inner cavity of the inner shell.
2. The pulverized coal burner as claimed in claim 1, wherein the inner cavity rear end of the ignition cover is provided in a flare shape.
3. A pulverized coal combustion device as claimed in claim 1 or 2, characterized in that the front end of the front section of the inner housing is provided in a closed-up shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321945704.7U CN220186804U (en) | 2023-07-24 | 2023-07-24 | Pulverized coal combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321945704.7U CN220186804U (en) | 2023-07-24 | 2023-07-24 | Pulverized coal combustion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220186804U true CN220186804U (en) | 2023-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321945704.7U Active CN220186804U (en) | 2023-07-24 | 2023-07-24 | Pulverized coal combustion device |
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| CN (1) | CN220186804U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703597A (en) * | 2024-02-06 | 2024-03-15 | 中国空气动力研究与发展中心空天技术研究所 | Microchannel high-temperature-resistant ignition device of ramjet engine, design method and preparation method |
-
2023
- 2023-07-24 CN CN202321945704.7U patent/CN220186804U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703597A (en) * | 2024-02-06 | 2024-03-15 | 中国空气动力研究与发展中心空天技术研究所 | Microchannel high-temperature-resistant ignition device of ramjet engine, design method and preparation method |
| CN117703597B (en) * | 2024-02-06 | 2024-04-12 | 中国空气动力研究与发展中心空天技术研究所 | Microchannel high-temperature-resistant ignition device of ramjet engine, design method and preparation method |
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