CN113969349B - Blowing structure and nozzle thereof - Google Patents
Blowing structure and nozzle thereof Download PDFInfo
- Publication number
- CN113969349B CN113969349B CN202010728099.2A CN202010728099A CN113969349B CN 113969349 B CN113969349 B CN 113969349B CN 202010728099 A CN202010728099 A CN 202010728099A CN 113969349 B CN113969349 B CN 113969349B
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- China
- Prior art keywords
- nozzle
- fuel gas
- gas
- blowing
- ring sleeve
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
Abstract
The invention discloses a blowing structure and a nozzle thereof, comprising: the upper end of the nozzle shell along the fuel gas flowing direction is provided with a nozzle opening communicated with the nozzle cavity and the outside, and the nozzle cavity is communicated with a fuel gas supply pipeline; and the adjustable expansion ring is used for adjusting the inner diameter size of the nozzle shell, is positioned at the lower end of the nozzle shell along the fuel gas flowing direction, and is communicated with the compressed medium pipeline. When fuel gas enters the spray cavity and is sprayed out through the nozzle opening, and the fuel gas and air pass through the adjustable expansion ring, the spray direction of the nozzle can be changed due to the coanda effect, so that the spray range of the mixed gas is adjusted, and the spray uniformity is improved. After the mixed gas is sprayed out of the nozzle, because the speed and the pressure are high, the air nearby is sucked into the mixed gas, and the fuel sprayed out of the nozzle can suck a large amount of air to be mixed with the mixed gas, so that the mixing degree of the gas and the total amount of the gas sprayed into the surface of the sintering material are improved, and the mixing uniformity degree of the gas is improved.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a blowing structure and a nozzle thereof.
Background
Sintering is a main raw material processing technology for steel smelting in China, and more than 75% of blast furnace raw materials are derived from sinter. However, sintering is a typical high-energy and high-pollution industry, the energy consumption of which is the second place in the steel industry, and the pollution load of which is 40% of the steel industry and is the first place. Along with the increasingly strict environmental protection requirements, the research and development of the high-energy-efficiency low-emission sintering clean production technology and equipment thereof have great significance in supporting the upgrading of the steel industry in China and realizing the green sustainable development.
In view of the above technical problems, gas injection and steam injection enhanced sintering technologies are proposed, and the two technologies are advanced sintering greening transformation technologies at present.
The gas injection technology is to replace part of coke powder added by sintering by injecting gas below the lower limit of the explosion concentration of the gas to the surface of the sinter bed after the ignition furnace, so that the gas enters the sinter bed from the surface of the bed and burns near the upper part of the burning zone. The technology can effectively reduce the consumption of the coke powder and the emission of pollutants in the whole production process. In addition, the technology can also effectively avoid the overhigh sintering peak temperature, prolong the sintering high-temperature holding time and improve the quality of the sintering ore.
The steam injection technology is to inject steam on the surface of the sinter bed, so that the steam passes through the upper sintered ore and then contacts the coke powder of the combustion zone to react, the water gas reaction is utilized to play a role in strengthening the combustion of the coke powder, the combustion is more complete, the combustion efficiency and the quality of the sinter are improved, and the use amount of the coke powder is reduced. In order to further improve sintering effect, the steam injection technology and the gas injection technology are coupled together, and the steam and the gas are coupled together in a coupling section and then sprayed out of a nozzle.
At present, the existing nozzle has poor uniformity of gas sprayed into a material surface, so that the blowing efficiency is low, and the sintering is not facilitated. In addition, the mixing efficiency of the pure fuel gas and the air is low, so that the total amount of the fuel gas sprayed in unit time is small, and the total amount of the fuel gas sprayed cannot be improved. And the gas entering the material level also depends on the air permeability of the material level, the power of the exhaust fan and the magnitude of negative pressure.
The amount of oxygen injected cannot be increased, and the amount of oxygen entering the material surface depends on the air permeability of the material surface, the power of the exhaust fan and the negative pressure.
Therefore, how to provide a nozzle with a blowing structure to improve the uniformity of blowing is a technical problem to be solved in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a nozzle with a blowing structure, which improves the uniformity of blowing. Another object of the present invention is to provide a blowing structure having the above nozzle.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a nozzle of a blowing structure, comprising:
the upper end of the nozzle shell along the flowing direction of the fuel gas is provided with a nozzle opening which is communicated with the nozzle cavity and the outside, and the nozzle cavity is communicated with a fuel gas supply pipeline;
and the adjustable expansion ring is used for adjusting the size of the inner diameter of the nozzle shell, is positioned at the lower end of the nozzle shell along the fuel gas flowing direction, and is communicated with a compressed medium pipeline.
Preferably, in the above nozzle, the nozzle housing includes:
the spray nozzle comprises a nozzle outer ring sleeve and a nozzle inner ring sleeve positioned at the inner side of the nozzle outer ring sleeve, wherein the nozzle inner ring sleeve is in sealing connection with the nozzle outer ring sleeve to form the spray cavity;
the adjustable expansion ring is sleeved on the inner side of the nozzle inner ring sleeve.
Preferably, in the above nozzle, the upper end of the nozzle outer ring sleeve and the upper end of the nozzle inner ring sleeve can be opened and closed to form the nozzle opening.
Preferably, in the above nozzle, the upper and lower distances between the nozzle outer ring sleeve and the nozzle inner ring sleeve are adjustable.
Preferably, in the above nozzle, the lower end of the nozzle outer ring sleeve is mounted by threads.
A blowing structure comprising a nozzle, wherein the nozzle is any one of the above.
Preferably, in the above injection structure, the fuel gas supply pipe is connected to the air inlet pipe of the nozzle through a connecting pipe and a reducing pipe, and the reducing pipe is tapered from the fuel gas supply pipe to the direction of the nozzle.
Preferably, in the above blowing structure, the taper angle of the reducer is adjustable, and the length of the connecting pipe is adjustable.
Preferably, in the above blowing structure, the distance between two adjacent nozzles is L, and the overlapping height of the blowing ranges of the two adjacent nozzles is h c The spray angle of the nozzle is a, and the height h of the nozzle from the material surface is as follows:
L＝2 tan a×(h-h c )
nozzle spacing materialThe surface height h is determined by the velocity v of the mixed gas 0 Determining;
the overlapping height h of the blowing ranges of two adjacent nozzles c Determined by h, generally h c 5 to 10 percent of h;
the mixed gas velocity of the fuel and the air sprayed from the nozzle is v 0 Pressure is p 0 The pressure of the sintered material surface is constant to be p 1 The gas velocity of the sintered material surface is constant v 1 The following equation can be derived from the bernoulli equation:
when v 0 If the calculated value is larger than the actual value, the taper angle of the reducer and/or the gas flow rate in the gas supply pipeline can be increased until the calculated value v 0 Equal to the actual v 0 。
Preferably, in the blowing structure described above, the nozzles are symmetrically arranged with respect to the gas supply line.
According to the technical scheme, the nozzle with the blowing structure disclosed by the invention has the advantages that the fuel gas enters the blowing cavity and is discharged through the nozzle opening, and when the fuel gas and the air pass through the adjustable expansion ring, the blowing direction of the nozzle can be changed due to the coanda effect, so that the blowing range of the mixed gas is adjusted, and the blowing uniformity is improved. After the mixed gas is sprayed out of the nozzle, because the speed and the pressure are high, the air nearby is sucked into the mixed gas, and the fuel sprayed out of the nozzle can suck a large amount of air to be mixed with the mixed gas, so that the mixing degree of the gas and the total amount of the gas sprayed into the surface of the sintering material are improved, and the mixing uniformity degree of the gas is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a side view of a blowing structure disclosed in an embodiment of the present invention;
FIG. 2 is a top view of a blowing structure disclosed in an embodiment of the present invention;
FIG. 3 is a schematic view of the blowing range of a nozzle according to an embodiment of the present invention;
fig. 4 is a diagram showing the positional relationship of nozzles disclosed in the embodiment of the present invention.
Detailed Description
In view of the above, the core of the present invention is to provide a nozzle with a blowing structure, which improves the uniformity of blowing. Another object of the core of the present invention is to provide a blowing structure having the nozzle described above.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1 to 4, the present invention discloses a nozzle of a blowing structure, which includes: a nozzle housing and an adjustable expansion ring 10. Wherein the nozzle housing has a spray chamber 1, and a nozzle opening 2 communicating the spray chamber 1 with the outside is provided at an upper end of the nozzle housing, the spray chamber 1 is communicated with a fuel gas supply line 9, in this application, a place located high in a direction in which the fuel gas flows is an upper end, and a place located low is a lower end. An adjustable expansion ring 10 is used to adjust the inner diameter size of the nozzle housing and is located at the lower end of the nozzle housing, the adjustable expansion ring 10 being in communication with a compressed medium line 11, where the compressed medium may be compressed air or hydraulic oil. By adjusting the amount of compressed medium entering the adjustable expansion ring 10, the degree of expansion of the adjustable expansion ring 10 is changed, thereby adjusting the blowing range of the outlet.
When in use, after the high-speed fuel gas is sprayed out of the nozzle opening 2, the mixed gas deviates from the original spraying direction perpendicular to the axial lead due to the coanda effect, and is sprayed out along with the raised annular wall surface of the annular nozzle, namely, the direction of the vertical axial lead is changed into the direction along the axial lead. According to Bernoulli's equation, the fuel gas velocity is high and the pressure is low, the pressure of air above the nozzle is larger than the pressure of mixed gas, and the air above the nozzle is sucked into the nozzle and mixed with the fuel gas while accelerating.
The fuel gas supply pipeline 9 is communicated with the spray cavity 1, the fuel gas enters the spray cavity 1 and is discharged through the nozzle opening 2, and when the fuel gas and the air pass through the adjustable expansion ring 10, the spraying direction of the nozzle can be changed due to the coanda effect, so that the spraying range of the mixed gas is adjusted, and the spraying uniformity is improved. After the mixed gas is sprayed out of the nozzle, because the speed and the pressure are high, the air nearby is sucked into the mixed gas, and the fuel sprayed out of the nozzle can suck a large amount of air to be mixed with the mixed gas, so that the mixing degree of the gas and the total amount of the gas sprayed into the surface of the sintering material are improved, and the mixing uniformity degree of the gas is improved.
In a specific embodiment, the nozzle housing includes: the outer nozzle ring sleeve 4 and the inner nozzle ring sleeve 5, wherein the outer nozzle ring sleeve 4 is used as the outer structure of the whole nozzle, the inner nozzle ring sleeve 5 is positioned inside the outer nozzle ring sleeve 4, and an annular spray cavity 1 is formed between the outer nozzle ring sleeve 4 and the inner nozzle ring sleeve 5. The adjustable expansion ring 10 is sleeved on the inner side of the nozzle inner ring sleeve 5. The injection range of the fuel gas is adjusted by changing the size of the adjustable expansion ring 10, thereby adjusting the size of the lower end of the nozzle inner collar 5.
In a further embodiment, the upper end of the nozzle outer ring sleeve 4 and the upper end of the nozzle inner ring sleeve 5 can be opened and closed to form the nozzle opening 2. Specifically, the upper end of the nozzle outer ring sleeve 4 is of a conical structure, the bottom surface of the conical structure abuts against the top end of the upper end of the nozzle inner ring sleeve 5, after the fuel gas enters the spray cavity 1, the pressure gradually becomes larger, and the position of the conical structure abutting against the upper end of the nozzle inner ring sleeve 5 can be opened under the action of the pressure, namely the nozzle opening 2 is opened.
In a preferred embodiment, the upper and lower distance of the nozzle outer collar 4 relative to the nozzle inner collar 5 is adjustable. By the arrangement, the size of the nozzle opening 2 can be adjusted, so that the blowing amount is controlled. In practice the lower end of the nozzle outer collar 4 can be mounted by means of a screw thread 3 and the size of the nozzle opening 2 can be adjusted by means of an adjusting screw thread 3. The adjustment of the size of the nozzle opening 2 can be achieved according to different embodiments.
In addition, the application also discloses a blowing structure, which comprises a nozzle, wherein the nozzle is specifically disclosed in the above embodiment, so that the blowing structure with the nozzle also has all the technical effects described above, and is not described in detail herein.
In practice, the fuel gas supply line 9 in the present application is connected to the inlet pipe 6 of the nozzle through a connecting pipe 8 and a reducer 7, and the reducer 7 is tapered from the fuel gas supply line 9 toward the nozzle. The reducer 7 in the present application can adjust the degree of tapering according to the degree of acceleration of the fuel gas. In addition, the length of the connection pipe 8 may be lengthened or shortened according to the nozzle position. In addition, the whole nozzle can move up and down by utilizing a tube bank lifting device on the fuel gas supply pipeline 9, and the vertical height of the nozzle and the material level is adjusted.
In particular, the fuel gas supply lines 9 connect symmetrically arranged nozzles, and the nozzle position on the fuel gas supply lines 9 can be determined according to the injection method. In particular, the installation height of the nozzle is such that the material level is positioned at the tail end of the primary mixing section and the front end of the mixing section, so that the uniformity of mixing of fuel gas, steam and air is improved.
Specific data relationship: the distance between two adjacent nozzles is L, and the coincidence height of the blowing ranges of the two adjacent nozzles is h c The spray angle of the spray nozzle is a, and the height h of the spray nozzle from the material surface is as follows:
L＝2 tan a×(h-h c )
the height h of the nozzle from the material surface is determined by the velocity v of the fuel gas 0 Determining;
the overlapping height h of the blowing ranges of two adjacent nozzles c Determined by h, generally h c 5 to 10 percent of h;
the jet angle a of the jet is determined by the jet structure, the jet can be regulated by the adjustable expansion ring 10 to a size, the adjustable expansion ring 10 is regulated to a smaller size, and conversely, the size a is increased;
the height h of the nozzle from the material surface is determined by the velocity v of the fuel gas 0 Determining that the total length of the jet section and the primary mixing section is larger than that of the jet section and the primary mixing section, wherein h is generally in the range of 0.2-0.7 m;
the mixed gas velocity of the fuel and the air sprayed from the nozzle is v 0 Pressure is p 0 The pressure of the sintered material surface is constant to be p 1 The gas velocity of the sintered material surface is constant v 1 The following equation can be derived from the bernoulli equation:
when v 0 If the calculated value is greater than the actual value, the taper angle of the reducer 7 and/or the gas flow rate in the gas supply line 9 may be increased up to the calculated value v 0 Equal to the actual v 0 。
Because the density of the fuel gas is smaller, the gravitational potential energy has less influence. Pressure p of the sinter level 1 And gas velocity v 1 Typically a fixed value. Sintering material surface pressure p 1 The pressure is about-15 to-7 pa relative to the atmospheric pressure.
The height h of the nozzle from the sintering material surface is reduced by the pipe row lifting device, so that fuel gas can enter the material surface more easily and cannot escape easily, but the mixing degree is reduced. H should be greater than the total length of the jet section and the primary mixing section. While the total length of the injection section and the primary mixing section and the velocity v of the mixed gas 0 Is in direct proportion. The height h of the nozzle from the material surface is adjusted through the pipe row lifting device, so that the speed v of the mixed gas is found out 0 And the requirement is optimal h which meets the requirement of the mixing degree.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A nozzle of a blowing structure, comprising:
a nozzle housing having a nozzle chamber (1), the upper end of the nozzle housing in the direction of fuel gas flow having a nozzle opening (2) communicating the nozzle chamber (1) with the outside, the nozzle chamber (1) communicating with a fuel gas supply line (9);
an adjustable expansion ring (10) for adjusting the inner diameter size of the nozzle housing, wherein the adjustable expansion ring (10) is positioned at one end of the nozzle housing far away from the nozzle opening, and the adjustable expansion ring (10) is communicated with a compressed medium pipeline (11).
2. The nozzle of claim 1, wherein the nozzle housing comprises:
the spray nozzle comprises a nozzle outer ring sleeve (4) and a nozzle inner ring sleeve (5) positioned at the inner side of the nozzle outer ring sleeve (4), wherein the nozzle inner ring sleeve (5) is in sealing connection with the nozzle outer ring sleeve (4) to form the spray cavity (1);
the adjustable expansion ring (10) is sleeved on the inner side of the nozzle inner ring sleeve (5).
3. Nozzle according to claim 2, characterized in that the upper end of the nozzle outer collar (4) and the upper end of the nozzle inner collar (5) can be opened and closed to form the nozzle opening (2).
4. A nozzle according to claim 3, characterized in that the outer nozzle collar (4) is adjustable in distance up and down relative to the inner nozzle collar (5).
5. Nozzle according to claim 4, characterized in that the lower end of the nozzle outer collar (4) is mounted by means of threads (3).
6. A blowing structure comprising a nozzle as claimed in any one of claims 1 to 5.
7. The blowing structure according to claim 6, characterized in that the fuel gas supply line (9) is connected to the inlet pipe (6) of the nozzle by means of a connecting pipe (8) and a reducer (7), the reducer (7) tapering from the fuel gas supply line (9) to the direction of the nozzle.
8. Blowing structure according to claim 7, characterized in that the taper angle of the reducer (7) is adjustable and the length of the connecting tube (8) is adjustable.
9. The blowing structure of claim 8 wherein the distance between two adjacent nozzles is L and the overlap of the blowing ranges of two adjacent nozzles is h c The spray angle of the nozzle is a, and the height h of the nozzle from the material surface is as follows:
L＝2tana×(h-h c )
the height h of the nozzle from the material surface is determined by the speed y of the mixed gas 0 Determining;
the overlapping height h of the blowing ranges of two adjacent nozzles c Determined by h, generally h c 5 to 10 percent of h;
the mixed gas velocity of the fuel and the air sprayed from the nozzle is v 0 Pressure is p 0 The pressure of the sintered material surface is constant to be p 1 The gas velocity of the sintered material surface is constant v 1 P is the density of the mixed gas, the following formula can be obtained by Bernoulli equation:
when v 0 If the calculated value is greater than the actual value, the taper angle of the reducer (7) and/or the gas flow rate in the gas supply line (9) can be increased up to a calculated value v 0 Equal to the actual v 0 。
10. Blowing structure according to claim 6, characterized in that the nozzles are arranged symmetrically with respect to the gas supply line (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728099.2A CN113969349B (en) | 2020-07-23 | 2020-07-23 | Blowing structure and nozzle thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728099.2A CN113969349B (en) | 2020-07-23 | 2020-07-23 | Blowing structure and nozzle thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113969349A CN113969349A (en) | 2022-01-25 |
| CN113969349B true CN113969349B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010728099.2A Active CN113969349B (en) | 2020-07-23 | 2020-07-23 | Blowing structure and nozzle thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1294552A (en) * | 1969-07-25 | 1972-11-01 | Hans Maile | Improvements in atmospheric gas burners |
| GB1303266A (en) * | 1969-02-11 | 1973-01-17 | ||
| US4260563A (en) * | 1976-07-28 | 1981-04-07 | Societe Sacilor, Acieries Et Laminoirs De Lorraine | Apparatus including a venturi for removing impurities from a gaseous mixture |
| CN1252018A (en) * | 1997-04-11 | 2000-05-03 | 格拉沃贝尔公司 | Lance for heating or ceramic welding |
| CN108386240A (en) * | 2018-04-19 | 2018-08-10 | 杭州中能汽轮动力有限公司 | A kind of steam turbine atomizer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2645299B1 (en) * | 2016-06-03 | 2018-09-12 | Bsh Electrodomésticos España, S.A. | GAS BURNER AND DOMESTIC COOKING APPLIANCE |
-
2020
- 2020-07-23 CN CN202010728099.2A patent/CN113969349B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1303266A (en) * | 1969-02-11 | 1973-01-17 | ||
| GB1294552A (en) * | 1969-07-25 | 1972-11-01 | Hans Maile | Improvements in atmospheric gas burners |
| US4260563A (en) * | 1976-07-28 | 1981-04-07 | Societe Sacilor, Acieries Et Laminoirs De Lorraine | Apparatus including a venturi for removing impurities from a gaseous mixture |
| CN1252018A (en) * | 1997-04-11 | 2000-05-03 | 格拉沃贝尔公司 | Lance for heating or ceramic welding |
| CN108386240A (en) * | 2018-04-19 | 2018-08-10 | 杭州中能汽轮动力有限公司 | A kind of steam turbine atomizer |
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| CN113969349A (en) | 2022-01-25 |
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