CN112082157A - Water-coal-slurry nozzle with high-pressure steam - Google Patents
Water-coal-slurry nozzle with high-pressure steam Download PDFInfo
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- CN112082157A CN112082157A CN202010919489.8A CN202010919489A CN112082157A CN 112082157 A CN112082157 A CN 112082157A CN 202010919489 A CN202010919489 A CN 202010919489A CN 112082157 A CN112082157 A CN 112082157A
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- nozzle
- coal
- pressure steam
- cavity
- water slurry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/22—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour the gaseous medium being vaporised fuel, e.g. for a soldering lamp, or other gaseous fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/38—Nozzles; Cleaning devices therefor
- F23D11/383—Nozzles; Cleaning devices therefor with swirl means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A coal-water slurry nozzle with high-pressure steam, comprising: the transition nozzle is communicated with the inlet end of the main nozzle, and the swirl core is arranged in the main nozzle. A plurality of secondary nozzles are uniformly arranged on the transition nozzle; the main nozzle includes: a vortex chamber, an outlet section, and a high pressure steam channel, wherein: the vortex cavity is communicated with the outlet end of the transition nozzle, the outlet section is connected with the outlet end of the vortex cavity, and the high-pressure steam channel surrounds the periphery of the vortex cavity. The invention can make the coal water slurry enter the swirling flow cavity at a higher speed by arranging the swirling flow cavities with different hierarchical structures and arranging the plurality of times of nozzles on the transition nozzle, the swirling flow core is provided with the tangential inlet, the coal water slurry can obtain a higher tangential speed so as to rotate in the swirling flow cavity, the service life of the nozzle is greatly prolonged while the effective atomization of the coal water slurry is realized, in addition, a high-pressure steam protective layer is added, the coal water slurry is prevented from being oxidized and combusted at a high temperature, a great amount of + H generated by the pyrolysis of water vapor has a promoting effect on the reduction of NOx by the coal water slurry, and the coal water slurry can be widely applied to industry as a reducing agent, and has certain industrial application value and commercial prospect.
Description
Technical Field
The invention relates to a technology in the field of clean combustion, in particular to a coal water slurry nozzle with high-pressure steam.
Background
The coal water slurry is a novel clean fuel, has the advantages of convenient storage, high concentration, fine granularity, good fluidity, high combustion efficiency, large load regulation range, environmental protection, energy conservation and the like, can be widely applied to the fields of power generation, industrial heating, urban heat supply and the like as a fuel, and can also be applied to the environmental protection field as a reducing agent, for example, being used as a reburning fuel to reduce NOx emission in pulverized coal combustion and the like. The traditional water-coal-slurry nozzle mostly adopts a compressed air atomization structure, when the water-coal-slurry is used as a reducing agent, the nozzle structure ensures that the water-coal-slurry carries a large amount of air, so that the water-coal-slurry is oxidized in a high-temperature environment, the aim of reducing NOx cannot be fulfilled, and the application of the water-coal-slurry is greatly limited; in addition, the coal water slurry is used as a coal-based liquid fuel, the existence of fine coal powder particles enables the coal water slurry nozzle to be easily blocked and abraded, frequent replacement of the nozzle is not only unfavorable for long-term stable operation of equipment, but also greatly improves operation and maintenance costs, and is a difficult problem which is always puzzled in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the water-coal-slurry nozzle with high-pressure steam, and the water-coal-slurry nozzle is provided with the rotational flow cavities with different hierarchical structures and the plurality of secondary nozzles, so that the water-coal-slurry obtains larger tangential speed to rotate in the rotational flow cavities, the atomization effect of the water-coal-slurry is enhanced, and the service life is greatly prolonged; the steam channel is arranged outside the swirling flow cavity, high-pressure steam is ejected together with atomized water coal slurry at high speed through the channel to form a protective layer, oxidation combustion caused by contact with oxygen after the water coal slurry is ejected is avoided, and meanwhile, more + H participating in NOx reduction reaction is pyrolyzed by the ejected steam at high temperature, so that the water coal slurry is used as a reducing agent to achieve a better effect in application.
The invention is realized by the following technical scheme:
the invention comprises the following steps: transition spout, main nozzle and whirl core, wherein: the transition nozzle is communicated with the inlet end of the main nozzle, and the rotational flow core is arranged in the main nozzle. A plurality of secondary nozzles are uniformly arranged on the transition nozzle; the main nozzle includes: a vortex chamber, an outlet section, and a high pressure steam channel, wherein: the vortex cavity is communicated with the outlet end of the transition nozzle, the outlet section is connected with the outlet end of the vortex cavity, and the high-pressure steam channel is arranged on the periphery of the vortex cavity in a surrounding manner.
The whirl chamber include: the cylindricality whirl chamber and the toper whirl chamber that top-down set gradually, wherein: the cylindrical cyclone cavity is arranged below the transition nozzle and communicated with the transition nozzle, the cyclone core is arranged at the bottom of the cylindrical cyclone cavity and connected with the conical cyclone cavity, and the outlet of the conical cyclone cavity is connected with the outlet section.
The high pressure steam channel comprises: a middle ring channel and an outer ring channel, wherein: the middle ring channel is arranged outside the cylindrical annular flow cavity, and the outer ring channel is arranged outside the middle ring channel and communicated with the middle ring channel.
The inner diameter of the conical cyclone cavity is gradually reduced from top to bottom.
The rotational flow core is provided with a tangential inlet.
Technical effects
Compared with the prior art, the multi-layer rotational flow cavity is arranged in the main nozzle structure, so that the coal water slurry continuously rotates by obtaining a larger tangential speed, the atomization effect of the coal water slurry is improved, and the service life of the nozzle is greatly prolonged as the coal water slurry is prevented from directly impacting the nozzle; meanwhile, the high-pressure steam channel is arranged in the main nozzle, so that atomized water-coal-slurry and high-pressure steam are sprayed out at a high speed, the water-coal-slurry is prevented from being oxidized due to contact with oxygen at a high temperature, a large amount of reducing active substances and H radicals can be generated, and the reducing effect of the water-coal-slurry when used as a reducing agent is obviously improved.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a cross-sectional view of the present invention taken along the center thereof;
FIG. 3 is a schematic view of a swirl core of the present invention;
FIG. 4 is an axial cross-sectional view of the swirl core;
FIG. 5 is a cross-sectional view of the nozzle body of the present invention with the swirl core removed along the axis;
in the figure: the device comprises a cyclone cavity 1, a cyclone core 2, a cylindrical cyclone cavity 3, a conical cyclone cavity 4, an outlet section 5, a tangential inlet 6, an outer ring channel 7, a middle ring channel 8, a transition nozzle 9, a main nozzle 10, a secondary nozzle 11 and high-pressure steam 12.
Detailed Description
As shown in fig. 1, the present embodiment relates to a coal-water slurry nozzle with high-pressure steam, which comprises: transition spout 9, main nozzle 10 and whirl core 2, wherein: the outlet end of the transition nozzle 9 is connected with the inlet end of the main nozzle 10, and the cyclone core 2 is arranged in the main nozzle 10 and is connected with the main nozzle 10 through threads. The main nozzle 9 and the inner liner of the cyclone core 2 are made of plasma sprayed silicon carbide ceramic, the hardness can reach HRC70, and the abrasion resistance is strong.
The main nozzle 10 includes: a swirl chamber 1, an outlet section 5 and a high pressure steam channel 12, wherein: the vortex cavity 1 is connected with the outlet end of the transition nozzle 9, the outlet section 5 is connected with the outlet end of the vortex cavity 1, and the high-pressure steam channel 12 is arranged on the outer layer of the vortex cavity 1.
The cyclone chamber 1 comprises: cylindrical vortex chamber 3 and toper vortex chamber 4 that set gradually along coal slurry incoming flow direction, wherein: the cylindrical vortex cavity 3 is communicated with the outlet end of the transition nozzle 9, the vortex core 2 is arranged at the bottom of the cylindrical vortex cavity 4 and is connected with the conical vortex cavity 5, and the conical vortex cavity 4 is connected with the inlet end of the outlet section 5.
The high pressure steam passage 12 includes: a middle ring channel 8 and an outer ring channel 7, wherein: the middle ring channel 8 is arranged outside the cylindrical swirling flow cavity 3, the outer ring channel 7 is arranged outside the middle ring channel 8 and communicated with the middle ring channel 8, high-pressure steam for factories is introduced into the outer ring channel 7 and is sprayed out from the middle ring channel 8, the steam pressure is 0.8-1.2MPa, and the temperature is 250-300 ℃.
The inner diameter of the conical swirling cavity 4 is gradually reduced from top to bottom, the rotating speed and the swirling strength of the coal water slurry in the cavity are gradually increased, and the atomization effect of the coal water slurry at the outlet is enhanced; the atomization angle of the water-coal-slurry at the nozzle outlet is 60-115 degrees, the average diameter of atomized particles is less than 120 microns, and the specific surface area is greatly improved.
The cyclone core 2 is provided with 4/6 tangential inlets 6, and the coal water slurry enters the cyclone cavity from the tangential inlets 6 to obtain a larger tangential speed, so that the coal water slurry does a rotary motion in the cylindrical cyclone cavity 3, the inner wall of the cyclone cavity 1 is prevented from being directly scoured by the high-speed coal water slurry jet, and the service life of the cyclone cavity 1 is prolonged.
The transition nozzle 9 is evenly provided with 4 secondary nozzles, the coal water slurry forms high-speed coal water slurry jet after passing through the transition nozzle 9, and the coal water slurry can be broken into coal water slurry particles after impacting the rotational flow core 2, so that the fluidity and the atomization effect of the coal water slurry particles are improved, and the blockage of the coal water slurry in the cavity is avoided.
Compared with the prior art, the invention can lead the coal water slurry to obtain larger tangential speed through the structural change so as to do continuous rotary motion in the cyclone cavity, thereby enhancing the atomization effect and prolonging the service life of the nozzle; through setting up the high-pressure steam passageway, must utilize high-pressure steam ingeniously at the peripheral protective layer that forms of the coal water slurry of spraying to avoid the oxidative combustion under the high temperature, and under the promotion that the steam pyrolysis produced a large amount of + H, promote the reduction effect greatly, make the coal water slurry can regard as the reductant of ideal to use in practical application.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A coal water slurry nozzle with high-pressure steam is characterized by comprising: transition spout, main nozzle and whirl core, wherein: the transition nozzle is communicated with the inlet end of the main nozzle, the cyclone core is arranged in the main nozzle, and a plurality of secondary nozzles are uniformly arranged on the transition nozzle; the main nozzle includes: a vortex chamber, an outlet section, and a high pressure steam channel, wherein: the vortex cavity is communicated with the outlet end of the transition nozzle, the outlet section is connected with the outlet end of the vortex cavity, and the high-pressure steam channel surrounds the periphery of the vortex cavity.
2. The water-coal-slurry nozzle with high-pressure steam as claimed in claim 1, wherein the swirling chamber comprises: the cylindricality whirl chamber and the toper whirl chamber that top-down set gradually, wherein: the cylindrical cyclone cavity is arranged below the transition nozzle and communicated with the transition nozzle, the cyclone core is arranged at the bottom of the cylindrical cyclone cavity and connected with the conical cyclone cavity, and the outlet of the conical cyclone cavity is connected with the outlet section.
3. The water-coal-slurry nozzle with high-pressure steam as claimed in claim 1, wherein the high-pressure steam passage comprises: a middle ring channel and an outer ring channel, wherein: the middle ring channel is arranged outside the cylindrical annular flow cavity, and the outer ring channel is arranged outside the middle ring channel and communicated with the middle ring channel.
4. The water-coal-slurry nozzle according to claim 2, wherein the inner diameter of the conical swirling chamber is gradually reduced from top to bottom.
5. A coal-water slurry nozzle as claimed in claim 1 or claim 2 in which the swirl element is provided with a tangential inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010919489.8A CN112082157B (en) | 2020-09-04 | 2020-09-04 | Water-coal-slurry nozzle with high-pressure steam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010919489.8A CN112082157B (en) | 2020-09-04 | 2020-09-04 | Water-coal-slurry nozzle with high-pressure steam |
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| Publication Number | Publication Date |
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| CN112082157A true CN112082157A (en) | 2020-12-15 |
| CN112082157B CN112082157B (en) | 2022-02-11 |
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| CN202010919489.8A Active CN112082157B (en) | 2020-09-04 | 2020-09-04 | Water-coal-slurry nozzle with high-pressure steam |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB375569A (en) * | 1931-07-14 | 1932-06-30 | Angelo Paganini | Improvements in spray nozzles for oil burners |
| CN87103318A (en) * | 1986-05-07 | 1987-12-02 | 株式会社日立制作所 | Atomizer and the coal-water slurry fired boiler of use atomizer |
| CN2141868Y (en) * | 1992-12-19 | 1993-09-08 | 李富林 | Multipurpose centrifugal fuel atomizing burner |
| CN2320910Y (en) * | 1997-11-28 | 1999-05-26 | 烟台开发区龙源电力燃烧控制工程有限公司 | Steam mechanical atomization oil gun head |
| CN2727558Y (en) * | 2004-05-12 | 2005-09-21 | 北京航空航天大学 | Heavy (residual) oil atomizing nozzle |
| CN2727573Y (en) * | 2004-06-21 | 2005-09-21 | 江阴市锅炉容器厂 | Pneumatic, electric or hydraulic logical combination valve for coal water slurry fired burner |
| CN201129724Y (en) * | 2007-09-18 | 2008-10-08 | 广东天乙集团有限公司 | Compound impact mixed cyclone-type petroleum water coke slurry nozzle |
| CN101435576A (en) * | 2008-11-28 | 2009-05-20 | 北京大学 | Double-stage injection type pre-film pneumatic atomizing nozzle |
| CN102433164A (en) * | 2011-10-20 | 2012-05-02 | 清华大学 | Entrained-flow bed gasification system and method for vapour conveyed pulverized coal |
| CN203586256U (en) * | 2013-09-27 | 2014-05-07 | 青岛开源集团有限公司 | Novel steam atomization type coal water slurry boiler |
| CN107763615A (en) * | 2016-08-19 | 2018-03-06 | 河南汇金智能装备有限公司 | Oil gun |
| CN209782662U (en) * | 2019-03-01 | 2019-12-13 | 上海逐源机械科技有限公司 | Three-fluid atomizing nozzle |
| CN110925747A (en) * | 2019-12-19 | 2020-03-27 | 上海交通大学 | Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame |
-
2020
- 2020-09-04 CN CN202010919489.8A patent/CN112082157B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB375569A (en) * | 1931-07-14 | 1932-06-30 | Angelo Paganini | Improvements in spray nozzles for oil burners |
| CN87103318A (en) * | 1986-05-07 | 1987-12-02 | 株式会社日立制作所 | Atomizer and the coal-water slurry fired boiler of use atomizer |
| CN2141868Y (en) * | 1992-12-19 | 1993-09-08 | 李富林 | Multipurpose centrifugal fuel atomizing burner |
| CN2320910Y (en) * | 1997-11-28 | 1999-05-26 | 烟台开发区龙源电力燃烧控制工程有限公司 | Steam mechanical atomization oil gun head |
| CN2727558Y (en) * | 2004-05-12 | 2005-09-21 | 北京航空航天大学 | Heavy (residual) oil atomizing nozzle |
| CN2727573Y (en) * | 2004-06-21 | 2005-09-21 | 江阴市锅炉容器厂 | Pneumatic, electric or hydraulic logical combination valve for coal water slurry fired burner |
| CN201129724Y (en) * | 2007-09-18 | 2008-10-08 | 广东天乙集团有限公司 | Compound impact mixed cyclone-type petroleum water coke slurry nozzle |
| CN101435576A (en) * | 2008-11-28 | 2009-05-20 | 北京大学 | Double-stage injection type pre-film pneumatic atomizing nozzle |
| CN102433164A (en) * | 2011-10-20 | 2012-05-02 | 清华大学 | Entrained-flow bed gasification system and method for vapour conveyed pulverized coal |
| CN203586256U (en) * | 2013-09-27 | 2014-05-07 | 青岛开源集团有限公司 | Novel steam atomization type coal water slurry boiler |
| CN107763615A (en) * | 2016-08-19 | 2018-03-06 | 河南汇金智能装备有限公司 | Oil gun |
| CN209782662U (en) * | 2019-03-01 | 2019-12-13 | 上海逐源机械科技有限公司 | Three-fluid atomizing nozzle |
| CN110925747A (en) * | 2019-12-19 | 2020-03-27 | 上海交通大学 | Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame |
Non-Patent Citations (1)
| Title |
|---|
| 翁卫国等: "220t/h水煤浆锅炉NOx排放特性的研究", 《浙江大学学报（工学版）》 * |
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| CN112082157B (en) | 2022-02-11 |
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