CN107537335B - Nozzle, mixer and feeding system - Google Patents
Nozzle, mixer and feeding system Download PDFInfo
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- CN107537335B CN107537335B CN201710936533.4A CN201710936533A CN107537335B CN 107537335 B CN107537335 B CN 107537335B CN 201710936533 A CN201710936533 A CN 201710936533A CN 107537335 B CN107537335 B CN 107537335B
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- nozzle
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- main channel
- mixer
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- 239000012530 fluid Substances 0.000 claims abstract description 91
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Nozzles (AREA)
- Accessories For Mixers (AREA)
Abstract
The invention relates to the technical field of combustion equipment, in particular to a nozzle, a mixer and a feeding system. The nozzle comprises a main channel, a plurality of annular channels, a plurality of communicating pipes and a regulating valve, wherein the cross section area of a fluid inlet of the nozzle is larger than that of a fluid outlet of the nozzle. The cross-sectional area of the fluid inlet is larger than that of the fluid outlet, so that a pressure difference is formed at the fluid outlet; the nozzle comprises a main channel and a plurality of annular channels sleeved on the outer side of the main channel, one end of the annular channel positioned in the nozzle is not communicated with the main channel, the other end of the annular channel is communicated with the outside, each annular channel is respectively communicated with the main channel through a communicating pipe, a regulating valve is arranged on each communicating pipe, the opening degree of the regulating valve is regulated, the stable pressure difference between the pressure at the fluid outlet and the atmospheric pressure is realized, and the technical problems that the nozzle is seriously worn and the fluid and the material are unevenly mixed are solved.
Description
Technical Field
The invention relates to the technical field of combustion equipment, in particular to a nozzle, a mixer and a feeding system.
Background
Most of small-sized thermal power plants, central heating stations, kilns and blast furnaces which take coal dust as materials adopt warehouse type coal dust supply systems. The pulverized coal is fed into a pulverized coal mixer from a pulverized coal bin through a coal feeding metering device by a coal dropping pipe, and air conveyed by positive pressure is uniformly mixed with the pulverized coal in the pulverized coal mixer and then is transmitted into a boiler through a conveying pipeline to participate in combustion.
The difficulty of positive pressure pulverized coal conveying lies in how to uniformly send pulverized coal into positive pressure air flow, the existing practice is that a nozzle is arranged on a mixer, the caliber of the nozzle along the axial direction is gradually reduced, and the venturi principle is adopted: the flow area of the gas is reduced, the flow speed of the gas is increased, an environment lower than the atmospheric pressure is formed at the outlet, and the coal dust falling from the upper part is sucked into the air by means of the formed negative pressure, so that the uniform mixing with the air is realized.
However, the existing nozzles often cause excessive negative pressure (pressure lower than atmospheric pressure) or micro positive pressure (pressure higher than atmospheric pressure) at the nozzle outlet due to the influence of the air flow or the subsequent mixed gas supply amount introduced into the nozzle. When the negative pressure (pressure difference from the atmospheric pressure) is too large, the abrasion at the nozzle will be serious; when micro positive pressure is generated, the pulverized coal falling from the upper part can be in powder supporting phenomenon, and the pulverized coal can fall to be mixed with air only when the pulverized coal is accumulated to a certain degree, but the uniform mixing of the pulverized coal and the air is not facilitated.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a nozzle for maintaining a stable pressure difference at the outlet of the nozzle, and reducing wear of the nozzle.
To achieve the purpose, the invention adopts the following technical scheme:
a nozzle having a fluid inlet with a cross-sectional area greater than a fluid outlet with a cross-sectional area of the nozzle, the nozzle comprising:
a main channel;
the annular channels are sleeved on the outer side of the main channel, one end of each annular channel positioned in the nozzle is not communicated with the main channel, and the other end of each annular channel is communicated with the outside;
a plurality of communicating pipes, each annular channel is respectively communicated with the main channel through the communicating pipe; and
and the regulating valves are arranged on each communicating pipe, and the stable pressure difference between the pressure at the fluid outlet and the atmospheric pressure is realized by regulating the opening of the regulating valves.
Further, the nozzle further comprises:
a sensor disposed at the fluid outlet for detecting a pressure differential at the fluid outlet; and
and the controller is respectively and electrically connected with the regulating valve and the sensor, and is used for receiving the pressure difference information fed back by the sensor and adjusting the opening degree of the regulating valve so as to realize stable pressure difference at the fluid outlet.
Further, the main channels are revolution bodies, each annular channel comprises a advection part and a constriction part which are communicated, and the constriction parts incline towards the central line of the main channels along the flowing direction of the fluid.
Further, the fluid is a liquid or a gas.
A second object of the present invention is to propose a mixer which solves the problem of non-uniform mixing of the fluid with the material.
To achieve the purpose, the invention adopts the following technical scheme:
a mixer, comprising:
a nozzle as described above;
a fluid inlet pipe connected with one end of the nozzle provided with the fluid inlet;
the inner cavity of the feeding chamber is communicated with the fluid outlet, a feeding hole for feeding materials is formed in the feeding chamber, and the position of the feeding hole is higher than that of the fluid outlet.
Further, the nozzle is arranged on the side wall of the feeding chamber, the side wall is connected with the bottom plate of the feeding chamber through a deflector which is obliquely arranged, and the deflector is positioned below the nozzle.
Further, a flange is arranged on the periphery of the nozzle, and the nozzle is fixed with the side wall through the flange.
Further, the main body of the feeding chamber is cuboid.
Further, the fluid is air, and the material is pulverized coal.
The third purpose of the invention is to provide a feeding system which is used for solving the problems of unstable pulverized coal feeding and combustion and high energy consumption.
To achieve the purpose, the invention adopts the following technical scheme:
a feed system comprising a mixer as described above.
The beneficial effects of the invention are as follows:
the nozzle provided by the invention comprises a main channel, a plurality of annular channels, a plurality of communicating pipes and a regulating valve, wherein the cross section area of a fluid inlet of the nozzle is larger than that of a fluid outlet of the nozzle. A cross-sectional area through the fluid inlet is greater than a cross-sectional area of the fluid outlet for creating a pressure differential at the fluid outlet; the nozzle comprises a main channel and a plurality of annular channels sleeved on the outer side of the main channel, one end of the annular channel positioned in the nozzle is not communicated with the main channel, the other end of the annular channel is communicated with the outside, each annular channel is respectively communicated with the main channel through a communicating pipe, a regulating valve is arranged on each communicating pipe, the opening of the regulating valve is regulated, stable pressure difference can be realized at a fluid outlet, and the technical problems that the nozzle is seriously worn and the fluid and the material are unevenly mixed are solved.
Drawings
FIG. 1 is a schematic view of the internal structure of a nozzle provided by the present invention;
fig. 2 is a schematic view of the internal structure of the mixer provided by the present invention.
In the figure:
a 100-mixer;
1-a nozzle; 2-fluid inlet pipe; 3-a feed chamber; 4-a deflector; 5-a mixing chamber; 6-a diffusion tube;
11-fluid inlet; 12-fluid outlet; 13-main channel; 14-an annular channel; 15-communicating pipe; 16-a regulating valve; 31-lumen; 32-a feed inlet; 33-a body;
141-advection part; 142-constriction.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be further described by the following detailed description with reference to the accompanying drawings.
As shown in fig. 1, the cross-sectional area of the fluid inlet 11 of the nozzle 1 provided in this embodiment is larger than the cross-sectional area of the fluid outlet 12 of the nozzle 1, and the nozzle 1 includes a main channel 13, a plurality of annular channels 14, a plurality of communicating pipes 15, and a regulating valve 16. Wherein, the annular channel 14 is sleeved outside the main channel 13, one end of the annular channel 14 positioned inside the nozzle 1 is not communicated with the main channel 13, and the other end is communicated with the outside. Each annular channel 14 is respectively communicated with the main channel 13 through a communicating pipe 15, a regulating valve 16 is arranged on each communicating pipe 15, and the opening degree of the regulating valve 16 is regulated to realize the stable pressure difference between the pressure at the fluid outlet 12 and the atmospheric pressure, and the pressure difference referred to in the application is that: the difference between the pressure developed at the fluid outlet 12 and atmospheric pressure (negative pressure means pressure less than atmospheric pressure and positive pressure means pressure greater than atmospheric pressure).
The present embodiment is used to achieve the technical effect of forming negative pressure at the fluid outlet 12 by the technical means that the cross-sectional area of the fluid inlet 11 is larger than the cross-sectional area of the fluid outlet 12; in the embodiment, the nozzle 1 comprises a main channel 13 and a plurality of annular channels 14 sleeved on the outer side of the main channel 13, one end of the annular channel 14 positioned in the nozzle 1 is not communicated with the main channel 13, the other end of the annular channel is communicated with the outside, each annular channel 14 is respectively communicated with the main channel 13 through a communicating pipe 15, a regulating valve 16 is arranged on each communicating pipe 15, the opening degree of the regulating valve 16 is regulated, the stable pressure difference between the pressure at the fluid outlet 12 and the atmospheric pressure is realized, and the technical problems that the nozzle 1 is seriously worn and the fluid and the material are unevenly mixed are solved. The specific control mode is that when the pressure difference at the fluid outlet 12 exceeds the steady pressure difference, the opening of the regulating valve 16 is increased, so that the effective cross-sectional area of the fluid passing through the fluid outlet 12 is increased (note that the cross-sectional area of the fluid outlet 12 is different from the effective cross-sectional area, the cross-sectional area refers to the cross-sectional area of the appearance, the effective cross-sectional area refers to the cross-sectional area of the fluid passing through), when the total flow rate of the introduced fluid is kept unchanged, the pressure difference at the fluid outlet 12 is reduced, and the steady pressure difference is realized through reasonable regulation; when the pressure difference at the fluid outlet 12 is lower than the steady pressure difference, the opening of the regulating valve 16 is reduced, the effective cross-sectional area of the fluid passing through the fluid outlet 12 is reduced, and when the total amount of the introduced fluid is kept unchanged, the pressure difference at the fluid outlet 12 is raised, and the steady pressure difference is realized through reasonable regulation. When there are a plurality of annular channels 14, the opening of one or more of the regulator valves 16 may be adjusted so long as the effective cross-sectional area of fluid passing through the fluid outlet 12 is changed.
In this embodiment, the cross-sectional area of the fluid inlet 11 of the nozzle 1 is larger than the cross-sectional area of the fluid outlet 12 of the nozzle 1, so that the flow velocity of the fluid passing through the nozzle 1 can be increased, thereby achieving the technical effect of better mixing with the subsequent materials. Specifically, the cross-sectional area of the fluid inlet 11 is DN100, the cross-sectional area of the fluid outlet 12 is DN50, and subsonic speeds (i.e., sound speeds of 0.4 to 0.7 times) can be obtained after the fluid delivered under pressure flows out of the nozzle 1.
In this embodiment, the nozzle 1 further comprises a sensor and a controller. The sensor is disposed at the fluid outlet 12 and is used for detecting a pressure difference at the fluid outlet 12, and the controller is electrically connected with the regulating valve 16 and the sensor respectively and is used for receiving pressure difference information fed back by the sensor and judging a relationship between the pressure difference information and a stable pressure difference. When the detected pressure difference is higher than the stable pressure difference, the controller controls the opening of the regulating valve 16 to increase, so that the effective cross-sectional area of the fluid passing through the fluid outlet 12 increases, and the pressure difference at the fluid outlet 12 is reduced; when the detected differential pressure is lower than the steady differential pressure, the controller controls the reduction of the opening of the regulator valve 16 to reduce the effective cross-sectional area of the fluid passing through the fluid outlet 12 and increase the differential pressure at the fluid outlet 12, thereby achieving automatic adjustment of the steady differential pressure.
In this embodiment, the main channel 13 is a revolution body, each annular channel 14 includes a advection portion 141 and a constriction portion 142 which are communicated, the constriction portion 142 is inclined toward the center line of the main channel 13 along the direction of fluid flow, and by providing the constriction portion 142, a differential pressure is formed at the outlet of the constriction portion 142 by venturi principle.
In this embodiment, the fluid is a liquid or a gas. In the case of a liquid, the liquid may be delivered by a pump; in the case of gas, the gas can be conveyed by a Roots blower.
As shown in fig. 2, the present embodiment also provides a mixer 100. The mixer 100 comprises a nozzle 1 as mentioned above, an inlet fluid pipe 2 and a feed chamber 3. Wherein, the fluid inlet pipe 2 is connected with one end of the nozzle 1 provided with the fluid inlet 11, air enters from the inlet of the fluid inlet pipe 2 along the direction A shown in figure 2, the inner cavity 31 of the feeding chamber 3 is communicated with the fluid outlet 12, the feeding chamber 3 is provided with a feeding hole 32 for feeding pulverized coal, the pulverized coal enters from the feeding hole 32 into the inner cavity 31 of the feeding chamber 3 along the direction B shown in figure 2, and the position of the feeding hole 32 is higher than that of the fluid outlet 12. The pulverized coal fed in this way enters the inner cavity 31 to be fully mixed with air under the action of self gravity and stable pressure difference at the fluid outlet 12. The problems that the nozzle 1 provided on the mixer 100 is worn seriously and the air is unevenly mixed with the pulverized coal are solved.
In this embodiment, nozzle 1 sets up on the lateral wall of feed chamber 3, and the lateral wall is connected through the guide plate 4 that the slope set up with the bottom plate of feed chamber 3, and guide plate 4 is located nozzle 1's below, can prevent that the buggy from entering into the dead angle that lateral wall and bottom plate formed, guarantees the intensive mixing of buggy and air. In addition, the feeding chamber 3 is also sequentially communicated with a mixing chamber 5 and a diffusion pipe 6, and the diffusion pipe 6 expands to the periphery along the flowing direction of the gas, so that the accelerated and pressurized air is restored to the normal speed and pressure to participate in the follow-up process.
In the embodiment, the periphery of the nozzle 1 is provided with a flange, and the nozzle 1 is fixed with the side wall through the flange, so that the disassembly and assembly are convenient. The main body 33 of the feed chamber 3 is rectangular parallelepiped and has planar side walls, so that the nozzle 1 is easily installed. In addition, in this embodiment, air may be replaced by other gases or liquids, and pulverized coal may be replaced by other materials, which are selected differently for different mixing processes, and are all within the scope of protection of the present application.
The present embodiment also provides a feeding system including the above mixer 100 to solve the problems that the abrasion of the nozzle 1 is serious and the mixing of fluid and material is not uniform.
It should be noted that the mixer and the feeding system in this embodiment are the same technical concept as the nozzle described above. Therefore, details of the mixer and the feeding system, which are not described in detail, are referred to the nozzle in this embodiment, and will not be described here.
Note that the basic principles and main features of the present invention and advantages of the present invention are shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the principles of the invention, and that various changes and modifications may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. A nozzle, characterized in that the cross-sectional area of the fluid inlet (11) of the nozzle (1) is larger than the cross-sectional area of the fluid outlet (12) of the nozzle (1), the nozzle (1) comprising:
a main channel (13);
a plurality of annular channels (14) sleeved on the outer side of the main channel (13), wherein one end of the annular channel (14) positioned in the nozzle (1) is not communicated with the main channel (13), and the other end is communicated with the outside;
a plurality of communicating pipes (15), wherein each annular channel (14) is respectively communicated with the main channel (13) through the communicating pipe (15); and
and a regulating valve (16) provided on each of the communicating pipes (15), the regulating valve (16) being provided with an opening degree for regulating a stable pressure difference between the pressure at the fluid outlet (12) and the atmospheric pressure.
2. The nozzle according to claim 1, characterized in that the nozzle (1) further comprises:
a sensor disposed at the fluid outlet (12) for detecting a pressure differential at the fluid outlet (12); and
and the controller is respectively and electrically connected with the regulating valve (16) and the sensor, and is used for receiving the pressure difference information fed back by the sensor and adjusting the opening degree of the regulating valve (16) so as to realize stable pressure difference at the fluid outlet (12).
3. Nozzle according to claim 1, characterized in that the main channel (13) is a revolution body, each of the annular channels (14) comprising a advection (141) and a constriction (142) in communication, the constriction (142) being inclined towards the centre line of the main channel (13) in the direction of the fluid flow.
4. A nozzle according to any one of claims 1 to 3, wherein the fluid is a liquid or a gas.
5. A mixer, comprising:
a nozzle (1) according to any one of claims 1 to 3;
a fluid inlet pipe (2) connected with one end of the nozzle (1) provided with the fluid inlet (11);
the feeding chamber (3), the inner chamber (31) of feeding chamber (3) with fluid outlet (12) are linked together, offer on feeding chamber (3) and be used for the feed inlet (32) that the material was put in, the position of feed inlet (32) is higher than fluid outlet (12).
6. Mixer according to claim 5, characterized in that the nozzle (1) is arranged on a side wall of the feed chamber (3), which side wall is connected to the floor of the feed chamber (3) by means of a deflector (4) arranged obliquely, which deflector (4) is located below the nozzle (1).
7. Mixer according to claim 6, characterized in that the nozzle (1) is provided with a flange on its outer circumference, by means of which the nozzle (1) is fastened to the side wall.
8. Mixer according to any one of claims 5 to 7, characterized in that the main body (33) of the feeding chamber (3) is rectangular parallelepiped.
9. A mixer according to any one of claims 5 to 7, wherein the fluid is air and the material is coal dust.
10. A feed system, characterized by comprising a mixer (100) according to any one of claims 5-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936533.4A CN107537335B (en) | 2017-10-10 | 2017-10-10 | Nozzle, mixer and feeding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936533.4A CN107537335B (en) | 2017-10-10 | 2017-10-10 | Nozzle, mixer and feeding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107537335A CN107537335A (en) | 2018-01-05 |
| CN107537335B true CN107537335B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710936533.4A Active CN107537335B (en) | 2017-10-10 | 2017-10-10 | Nozzle, mixer and feeding system |
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| Country | Link |
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| CN (1) | CN107537335B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847653B (en) * | 2019-01-21 | 2020-10-27 | 西安交通大学 | Mixed fuel pressurization continuous feeding system and method |
| CN111097299B (en) * | 2019-12-26 | 2022-03-15 | 煤科院节能技术有限公司 | Pressure regulating mixer |
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| CN106861961A (en) * | 2017-03-10 | 2017-06-20 | 山东大学 | A kind of self-adjustable injector |
| CN206425119U (en) * | 2017-01-21 | 2017-08-22 | 河南能化技研有限公司 | The ejector system for realizing circulation in derived energy chemical field, volleying and mixing |
| CN207307634U (en) * | 2017-10-10 | 2018-05-04 | 中煤科工清洁能源股份有限公司 | A kind of nozzle, mixer and feeding system |
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2017
- 2017-10-10 CN CN201710936533.4A patent/CN107537335B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885084A (en) * | 1988-06-22 | 1989-12-05 | Flint & Walling, Inc. | Nozzle/venturi with pressure differentiating bypass |
| CN2386885Y (en) * | 1998-12-16 | 2000-07-12 | 赵桂生 | Metallurgical ore jetting appts. |
| JP2012030200A (en) * | 2010-08-03 | 2012-02-16 | Jfe Engineering Corp | Fluid atomization nozzle and fluid atomizing device |
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| CN105065341A (en) * | 2015-07-15 | 2015-11-18 | 西安交通大学 | Ejector of which mixing cavity is in parallel connection with bypasses |
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