CN113368716A - Air-oxygen mixer for oxygen-enriched ignition and control method thereof - Google Patents
Air-oxygen mixer for oxygen-enriched ignition and control method thereof Download PDFInfo
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- CN113368716A CN113368716A CN202110475969.4A CN202110475969A CN113368716A CN 113368716 A CN113368716 A CN 113368716A CN 202110475969 A CN202110475969 A CN 202110475969A CN 113368716 A CN113368716 A CN 113368716A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
- F23Q13/02—Igniters not otherwise provided for using gas burners, e.g. gas pokers
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- 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
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- 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
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Abstract
The invention discloses an air-oxygen mixer for oxygen-enriched ignition and a control method thereof, the air-oxygen mixer for oxygen-enriched ignition comprises a mixer main pipe, an oxygen conveying pipe, an inner sleeve pipe and an inner sleeve pipe lifting driving mechanism, wherein the lower end of the mixer main pipe is provided with an air inlet, the upper end of the mixer main pipe is provided with a mixed gas outlet, the oxygen conveying pipe comprises a first pipe section and a second pipe section, the first pipe section penetrates through the side wall of the mixer main pipe, the first pipe section is provided with an oxygen inlet outside the mixer main pipe, the second pipe section is positioned inside the mixer main pipe and extends towards the mixed gas outlet, the side wall of the second pipe section is provided with a plurality of groups of oxygen spraying holes arranged from top to bottom, the inner sleeve pipe is downwards inserted inside the second pipe section, the inner sleeve pipe lifting driving mechanism is connected with the inner sleeve pipe, and the air-oxygen mixer for oxygen-enriched ignition and the control method thereof aim at solving the problems of large pressure drop of mixed gas of the air-oxygen mixer in the prior art, The mixing effect is poor.
Description
Technical Field
The invention relates to the field of gas mixing devices for oxygen-enriched ignition, in particular to an air-oxygen mixer for oxygen-enriched ignition and a control method thereof.
Background
The iron ore sintering is a technological process that iron ore powder, solvent, fuel and other raw materials are mixed with a proper amount of water to prepare a mixture, the mixture is paved on a sintering machine, ignition is carried out on the surface of a material layer to form a combustion zone, the combustion zone descends under the action of air draft of a lower bellows and sequentially penetrates through the whole material layer, and the mixture is subjected to a series of physical and chemical processes such as melting, recrystallization and the like in the combustion zone to form sintered ore. The metallurgical properties of the iron ore treated by the sintering process, such as air permeability, mechanical strength, reduction degradation degree and the like, are obviously improved, and the iron ore becomes the mainstream blast furnace ironmaking raw material at present.
The oxygen-enriched ignition is an auxiliary ignition process which is characterized in that pure oxygen with a certain proportion is introduced into a combustion air pipeline of an ignition furnace, so that the oxygen content of the combustion air in the ignition furnace is increased, the combustion temperature of low-calorific-value fuel is increased, and the ignition effect of a charge level is enhanced. In the process, oxygen and air are uniformly mixed by a mixer and then are introduced into an ignition furnace. The mixing degree of oxygen and air directly influences the oxygen-enriched ignition effect, the mixing effect is too poor, the flame temperature in the ignition furnace is uneven, the reaction is violent in places with high oxygen concentration, the flame temperature is higher, and the reaction is milder and the flame temperature is lower in places with low oxygen concentration. The hearth temperature is uneven, the consistency of the charge level is reduced, and the ignition effect is poor.
The gas-gas mixer in the prior art is difficult to meet the special application scene of oxygen-enriched ignition. Firstly, the pressure and flow difference between the oxygen tube and the air tube in the mixer for oxygen-enriched ignition is very large, the mixers in the prior art cannot be matched with each other, and the mixing effect is limited. Secondly, the mixer for oxygen-enriched ignition is very sensitive to pressure loss of an air pipeline, the existing mixer mostly adopts the principle of scattering of mixing blades to realize mixing among gases, and the main source of mixed power is airflow pressure, so that the pressure drop of mixed gas is very large after the mixed gas flows through the mixer, the resistance loss of the mixer is large, and the influence on the air supply capacity is large.
Disclosure of Invention
Technical problem to be solved
Based on the technical scheme, the invention provides an air-oxygen mixer for oxygen-enriched ignition and a control method thereof, and aims to solve the technical problems of large pressure drop and poor mixing effect of mixed gas in the air-oxygen mixer in the prior art.
(II) technical scheme
In order to solve the technical problem, the invention provides an air-oxygen mixer for oxygen-enriched ignition, which comprises a mixer main pipe, an oxygen conveying pipe, an inner sleeve pipe and an inner sleeve pipe lifting driving mechanism, wherein the lower end of the mixer main pipe is provided with an air inlet, the upper end of the mixer main pipe is provided with a mixed gas outlet, the oxygen conveying pipe sequentially comprises a first pipe section and a second pipe section, the first pipe section penetrates through the side wall of the mixer main pipe, the first pipe section is provided with the oxygen inlet outside the mixer main pipe, the second pipe section is positioned inside the mixer main pipe and extends towards the mixed gas outlet, the side wall of the second pipe section is provided with a plurality of groups of oxygen spraying holes arranged from top to bottom, the oxygen spraying holes are obliquely arranged downwards towards the outer side of the second pipe section, the upper end of the inner sleeve pipe is closed, and the lower end of the inner sleeve pipe forms an opening, the inner sleeve is downwards inserted into the second pipe section and can slide and lift relative to the second pipe section to plug the oxygen spraying hole, and the inner sleeve lifting driving mechanism is installed on the mixer main pipe and connected with the inner sleeve.
Preferably, the outer side wall of the second pipe section is provided with a guide vane.
Preferably, an axial sealing strip arranged along the axial direction of the inner sleeve is arranged between the inner sleeve and the second pipe section, and a sealing ring arranged along the circumferential direction of the inner sleeve is arranged between the inner sleeve and the second pipe section.
Preferably, the lateral wall that the blender was responsible for is provided with the edge the axial extension's that the blender was responsible for leads to the groove, interior sleeve pipe lift actuating mechanism include the motor, with the gear that motor drive is connected and can install with sliding the rack of the lateral wall surface that the blender was responsible for, the rack is connected with the lifter, the lifter runs through lead to the groove with interior bushing, lead to groove department and install the sealing member.
Preferably, the sealing element is a dynamic and static sealing assembly or a soft sealing sleeve covering the rack and the through groove.
Preferably, the axes of the inner sleeve, the second pipe section and the mixer main pipe are coincident.
Preferably, each group of oxygen ejection holes has a plurality of oxygen ejection holes therein arranged in a circumferential direction of the second pipe section.
In addition, the invention also provides a control method of the air-oxygen mixer for oxygen-enriched ignition, which is characterized in that the air-oxygen mixer for oxygen-enriched ignition is adopted, and the control method comprises the following steps: the inner sleeve is driven to lift by the inner sleeve lifting driving mechanism, so that the inner sleeve is positioned at different heights to block oxygen spraying holes with different groups.
Preferably, the control method includes the steps of:
a. according to the oxygen concentration C of the mixed gas sprayed from the mixed gas outlet and the air flow Q entering from the air inletairThe oxygen flow Q of the oxygen delivery pipe is calculated according to the following formulaO2Target value of (c):
wherein
The value range of C is 0.23-0.31;
b. the oxygen flow adjustment coefficient R is calculated according to the following formula:
c. the number of groups of oxygen ejection holes blocked by the inner tube is determined based on the value of R, and the smaller the value of R, the larger the number of groups of oxygen ejection holes blocked by the inner tube.
Preferably, the control method further includes:
in the step b, the oxygen flow of the middle oxygen delivery pipe is taken as the reference oxygen flow when the oxygen-enriched concentration is 0.23
The sectional area A0 of the oxygen jet holes in a single group is designed to make the oxygen jet flow velocity V of the oxygen jet holesO2Is 20m/s, in this case
Is 0.026QairThe calculation formula is as follows:
preferably, in the step c, the number of groups in which the inner tube blocks the oxygen ejection holes is determined according to the value of R as follows:
when R belongs to [1,1.5), the inner sleeve is moved to the first station, and the inner sleeve seals all groups of oxygen spraying holes above the first group of oxygen spraying holes,
when R epsilon is 1.5,2.5), the inner sleeve pipe is moved to a second station, at the moment, the inner sleeve pipe blocks all groups of oxygen spraying holes above the first group and the second group of oxygen spraying holes,
when R is equal to [2.5,3.5), the inner sleeve moves to a third station, and the inner sleeve blocks all groups of oxygen spraying holes above the first group, the second group and the third group of oxygen spraying holes,
when R is equal to [3.5,4.5), the inner sleeve moves to a fourth station, the inner sleeve seals all groups of oxygen spraying holes above the first group, the second group, the third group and the fourth group of oxygen spraying holes,
when R is equal to 4.5,5.5), the inner sleeve moves to a fifth station, the inner sleeve seals all groups of oxygen spraying holes above the first group, the second group, the third group, the fourth group and the fifth group of oxygen spraying holes,
and when the R belongs to [5.5,6], the inner sleeve moves to a sixth station, and the inner sleeve blocks all the groups of oxygen spraying holes above the first group, the second group, the third group, the fourth group, the fifth group and the sixth group of oxygen spraying holes.
Preferably, the control method further comprises the step of regulating the flow of oxygen by means of a regulating valve and a flow meter on the oxygen delivery pipe.
(III) advantageous effects
Compared with the prior art, the air-oxygen mixer for oxygen-enriched ignition and the control method thereof have the beneficial effects that:
in the air-oxygen mixer for oxygen-enriched ignition, oxygen can be injected into the main pipe of the mixer at high speed from the oxygen ejection hole at a downward oblique speed, and is mixed with air in a counter-flow mode by utilizing the characteristics of high oxygen pressure and high flow speed. The dynamic pressure energy of the oxygen is converted into the driving force for mixing the air and the oxygen, so that the pressurization of the high-pressure oxygen is realized, and the high-efficiency mixing of the air and the oxygen is also completed.
The hybrid power between the air and the oxygen in the air-oxygen mixer for oxygen-enriched ignition mainly comes from the oxygen dynamic pressure, and the resistance loss of the air flowing through the mixing chamber is very small for large-flow air, so that the resistance of the mixer to the air flow is small. The forward driving force of the mixed gas is mainly air pressure, so that the driving force of the mixed gas is not greatly reduced after passing through the mixer.
In the control method of the air-oxygen mixer for oxygen-enriched ignition, the stability of the oxygen spraying flow speed is kept under the condition of dynamic change of the oxygen flow by adjusting the number of groups of actually-operated oxygen spraying holes, so that the mixer is in a proper flow speed range.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic diagram showing the structure of an air-oxygen mixer for oxygen-rich ignition according to an embodiment of the present invention;
FIG. 2 is a sectional plan view of a part of the oxygen-rich ignition air-oxygen mixer according to the embodiment of the present invention;
fig. 3 is a partial schematic view of an inner tube of an oxygen-enriched ignition air-oxygen mixer in a first working position according to an embodiment of the present invention.
Description of reference numerals:
1. the device comprises an inner sleeve, 2, a flow deflector, 3, an axial sealing strip, 4, a sealing ring, 5, a gear, 6, a rack, 7, a lifting rod, 100, a mixer main pipe, 101, a mixing cavity, 102, an air inlet, 103, a mixed gas outlet, 200, an oxygen conveying pipe, 201, a first pipe section, 202, a second pipe section, 203, an oxygen inlet, 204 and an oxygen ejection hole.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two or more elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, and may be connected through the inside of 2 elements, or may be "in transmission connection", that is, connected by various suitable means such as belt transmission, gear transmission or sprocket transmission, and the terms "a plurality" and "a plurality" mean "at least 2" and "at least 2" groups. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, the present invention provides an air-oxygen mixer for oxygen-enriched ignition, comprising a mixer main pipe 100 (a mixing chamber 101 is formed in the mixer main pipe and can be used for mixing oxygen and air), an oxygen delivery pipe 200, an inner sleeve 1 and an inner sleeve lifting drive mechanism, wherein the lower end of the mixer main pipe 100 is provided with an air inlet 102, the upper end of the mixer main pipe 100 is provided with a mixed gas outlet 103, the oxygen delivery pipe 200 comprises a first pipe section 201 and a second pipe section 202 in sequence, in one example, the first pipe section 201 is arranged along the transverse direction, the second pipe section 202 is arranged along the vertical direction, the connection between the first pipe section 201 and the second pipe section is a bent pipe section, the first pipe section 201 penetrates through the side wall of the mixer main pipe 100, the first pipe section 201 has an oxygen inlet 203 (which can be formed on the tail end face of the first pipe section 201) outside the mixer main pipe 100, the second pipe section 202 is located inside the mixer main pipe 100 and extends towards the mixed gas outlet 103, the side wall of the second pipe section 202 has a plurality of groups of oxygen spraying holes 204 arranged from top to bottom, each group of oxygen spraying holes 204 may further have a plurality of (but not limited to) oxygen spraying holes 204 arranged along the circumferential direction of the second pipe section 202, the oxygen spraying holes 204 are arranged obliquely downward toward the outer side of the second pipe section 202, the upper end of the inner sleeve 1 is closed, the lower end of the inner sleeve 1 is opened, the inner sleeve 1 is inserted downward into the second pipe section 202 and can slide and lift relative to the second pipe section 202 to block the oxygen spraying holes 204, the inner sleeve 1 is at different height positions due to the plurality of groups of oxygen spraying holes 204 arranged from top to bottom, the number of groups of the blocked oxygen spraying holes 204 is different, the lower the position of the inner sleeve 1 is, the larger the number of groups of the blocked oxygen spraying holes 204 is, the smaller the number of groups of the oxygen spraying holes 204 actually operated is, and the higher the position of the inner sleeve 1 is, the smaller the number of groups of the oxygen gas ejection holes 204 blocked, the larger the number of groups of the oxygen gas ejection holes 204 actually operated, and the inner jacket tube elevation drive mechanism is attached to the mixer main tube 100 and connected to the inner jacket tube 1.
As a preferred embodiment of the present invention, the guide vane 2 is disposed on the outer side wall of the second tube segment 202, and may be in the form of a spiral sheet that spirals from bottom to top, so as to guide a portion of the air to form a spirally rising airflow on the outer side of the second tube segment 202 of the oxygen conveying tube 200, thereby enhancing the mixing effect, and the present invention is not limited thereto.
Furthermore, an axial sealing strip 3 arranged in the axial direction of the inner jacket tube 1 is provided between the inner jacket tube 1 and the second tube section 202, and a sealing ring 4 arranged in the circumferential direction of the inner jacket tube 1 is provided between the inner jacket tube 1 and the second tube section 202.
As a specific embodiment, the side wall of the main mixer pipe 100 is provided with a through groove extending along the axial direction of the main mixer pipe 100, the inner sleeve pipe lifting driving mechanism comprises a motor, a gear 5 in transmission connection with the motor, and a rack 6 slidably mounted on the outer surface of the side wall of the main mixer pipe 100, the rack 6 is connected with a lifting rod 7, the lifting rod 7 penetrates through the through groove to be connected with the inner sleeve pipe 1 (specifically, the lifting rod can be connected at the upper end of the inner sleeve pipe 1), and a sealing member is mounted at the through groove. The sealing element is a dynamic and static sealing component or a soft sealing sleeve (not shown, but well understood) covering the rack 6 and the through groove, and of course, the inner sleeve lifting driving mechanism can also have various suitable alternative modes, such as a lifting hydraulic rod driving mode and the like.
According to the preferred embodiment of the present invention, the axes of the inner tube 1, the second pipe section 202, and the mixer main pipe 100 coincide with each other, and if necessary, the axes of the three may not coincide with each other as an alternative.
In addition, the invention also provides a control method of the air-oxygen mixer for oxygen-enriched ignition, wherein the control method comprises the following steps: the inner sleeve 1 is driven to move up and down by the inner sleeve lifting driving mechanism, so that the inner sleeve 1 is at different heights to seal different groups of oxygen spraying holes 204. Specifically, the control method comprises the steps of:
a. according to the oxygen concentration C of the mixed gas ejected from the mixed gas outlet 103 and the air flow Q entering from the air inlet 102airThe oxygen flow rate Q of the oxygen delivery pipe 200 is calculated as followsO2Target value of (c):
wherein
The value range of C is 0.23-0.31,
the relevant design principle of the step is as follows:
in the actual production process of oxygen enrichment ignition, the proper oxygen enrichment concentration is generally taken as a value within the range of 0.23-0.31, the oxygen enrichment cost is too high when the value is exceeded, the oxygen enrichment effect is not obvious when the value is lower than the value, and the specific value is determined by the heat value of the fuel. Due to fluctuations in the calorific value of the fuel, the oxygen concentration at the mixture outlet 103 is dynamically adjusted, which requires a corresponding adjustment of the oxygen flow rate. The oxygen concentration at the mixed gas outlet 103 is C (i.e. oxygen-rich concentration), and the oxygen flow rate and the air flow rate are Q respectivelyO2And QairThen there is
When the oxygen-enriched concentration C is adjusted between 0.23 and 0.31, the corresponding oxygen flow rate obtained by the above formula is between 0.026 and 0.145Qair, the adjustment range of the oxygen flow rate is very large, and the maximum flow rate is about 6 times of the minimum flow rate, so that the number of the oxygen ejection holes 204 needs to be correspondingly adjusted to prevent the situation that the oxygen ejection flow speed is too large or too small in the oxygen flow rate adjustment process. Aiming at the problem, a corresponding control method is provided, and the number of the injection holes which are put into operation is dynamically adjusted based on the change of the oxygen-enriched concentration so as to maintain the relative stability of the oxygen flow rate when the oxygen flow changes:
specifically, in step b, the oxygen flow rate of the medium oxygen delivery pipe 200 is taken as the reference oxygen flow rate when the oxygen-enriched concentration is 0.23
The sectional area A0 of the oxygen jet holes 204 in a single set is designed so that the oxygen jet flow velocity V of the oxygen jet holes 204O2Is 20m/s, in this case
Is 0.026QairThe calculation formula is as follows:
b. the oxygen flow adjustment coefficient R is calculated according to the following formula:
c. the number of groups in which the inner tube 1 blocks the oxygen ejection holes 204 is determined based on the value of R, the smaller the value of R, the larger the number of groups in which the inner tube 1 blocks the oxygen ejection holes 204, and specifically, the number of groups in which the inner tube 1 blocks the oxygen ejection holes 204 is determined based on the value of R in the following operation, it can be easily understood that, in the following specific operation, in conjunction with fig. 3, the oxygen ejection holes 204 are, in order from top to bottom, a first group of oxygen ejection holes, a second group of oxygen ejection holes, a third group of oxygen ejection holes, a fourth group of oxygen ejection holes, a fifth group of oxygen ejection holes, and a sixth group of oxygen ejection holes, but not limited to six groups, and cases less than or more than six groups will fall within the protection scope of the present invention:
referring to fig. 3, when R e [1,1.5), the inner tube 1 is moved to the first station, at which time the inner tube 1 closes all the groups of oxygen ejection holes 204 above the first group of oxygen ejection holes, the sectional area of the first group of oxygen ejection holes to be put into operation is a0, and the oxygen ejection flow rate V of the oxygen ejection holes 204O2＝(QO2the/A0) is epsilon [20,30) m/s, and based on the formulas, the specific oxygen jet flow velocity VO2The derivation process of the end value is as follows:
the oxygen flow rate of the medium oxygen delivery pipe 200 is set as the reference oxygen flow rate when the oxygen-rich concentration C is 0.23
Namely, it is
At this time VO2＝0.026R/(1.3×10-3) When R is 1, VO2When R is 1.5, V is 20O230, the following oxygen ejection flow rate VO2All the derivations of (a) can be referred to herein,
when R ∈ [1.5, 2.5)), the inner sleeve 1 is moved to the second station, at this time, the inner sleeve 1 blocks all the groups of oxygen ejection holes 204 above the first group and the second group of oxygen ejection holes, the sum of the sectional areas of the first group of oxygen ejection holes and the second group of oxygen ejection holes which are put into operation is 2A0, and the oxygen ejection flow velocity V of the oxygen ejection holes 204 isO2＝(QO2/2A0)∈[15,25)m/s，
When R ∈ [2.5, 3.5)), the inner tube 1 moves to the third station, at which time the inner tube 1 blocks all the groups of oxygen ejection holes 204 above the first, second, and third groups of oxygen ejection holes, the sum of the sectional areas of the first, second, and third groups of oxygen ejection holes that are put into operation is 3A0, and the oxygen ejection flow rate V of the oxygen ejection holes 204 isO2＝(QO2/3A0)∈[16.6,23.4)m/s，
When R belongs to [3.5,4.5), the inner sleeve 1 moves to the fourth station, at this time, the inner sleeve 1 blocks all the groups of oxygen spraying holes 204 above the first group, the second group, the third group and the fourth group of oxygen spraying holes, the sum of the sectional areas of the first group of oxygen spraying holes, the second group of oxygen spraying holes, the third group of oxygen spraying holes and the fourth group of oxygen spraying holes which are put into operation is 4A0, and the oxygen spraying flow velocity V of the oxygen spraying holes 204 isO2＝(QO2/4A0)∈[17.5,22.5)m/s，
When R epsilon is 4.5,5.5), the inner sleeve 1 moves to a fifth working position, and the inner sleeve 1 blocks the first group,The sum of the sectional areas of the oxygen ejection holes 204 of all the groups above the oxygen ejection holes of the second, third, fourth and fifth groups, the first, second, third, fourth and fifth groups, which were put into operation, was 5A0, and the oxygen ejection flow rate V of the oxygen ejection holes 204 was set to be equal toO2＝(QO2/5A0)∈[18,22)m/s，
When R is equal to [5.5,6]]At this time, the inner jacket tube 1 is moved to the sixth station, and at this time, the inner jacket tube 1 blocks all the groups of oxygen ejection holes 204 above the first, second, third, fourth, fifth and sixth groups of oxygen ejection holes, the sum of the sectional areas of the first, second, third, fourth, fifth and sixth groups of oxygen ejection holes, which are put into operation, is 6a0, and the oxygen ejection flow rate V of the oxygen ejection holes 204 is set to 6a0O2＝(QO2/6A0)∈[18.3,20]m/s，
The oxygen flow rate is regulated to Qo2, and can be regulated by a regulating valve and a flow meter on the oxygen delivery pipe.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (12)
1. The utility model provides an oxygen-enriched ignition is with empty oxygen blender, its characterized in that, is responsible for, oxygen delivery pipe, interior sleeve pipe and interior sleeve pipe lift actuating mechanism including the blender, air inlet has been seted up to the lower extreme that the blender was responsible for, the gas mixture export has been seted up to the upper end that the blender was responsible for, oxygen delivery pipe includes first pipeline section and second pipeline section in proper order, first pipeline section link up the lateral wall that the blender was responsible for, first pipeline section is in the outside that the blender was responsible for has the oxygen inlet, the second pipeline section is located the inside that the blender was responsible for just towards the gas mixture export extends, the lateral wall of second pipeline section has from last multiunit oxygen blowout hole of arranging down, oxygen blowout hole orientation the outside of second pipeline section sets up to the downside, interior sheathed tube upper end is sealed, interior sheathed tube lower extreme forms the opening, interior sleeve pipe cartridge is in downwards inside the second pipeline section and can for the second pipeline section slips and rises for And the inner sleeve lifting driving mechanism is arranged on the mixer main pipe and is connected with the inner sleeve.
2. The air-oxygen mixer for oxygen-enriched ignition according to claim 1, wherein a flow deflector is disposed on the outer side wall of the second pipe section.
3. The air-oxygen mixer for oxygen-enriched ignition according to claim 1, wherein an axial sealing strip arranged along the axial direction of the inner sleeve is arranged between the inner sleeve and the second pipe section, and a sealing ring arranged along the circumferential direction of the inner sleeve is arranged between the inner sleeve and the second pipe section.
4. An air-oxygen mixer for oxygen-enriched ignition according to claim 1, wherein the side wall of the main mixer tube is provided with a through groove extending along the axial direction of the main mixer tube, the inner sleeve tube lifting driving mechanism comprises a motor, a gear in transmission connection with the motor, and a rack slidably mounted on the outer surface of the side wall of the main mixer tube, the rack is connected with a lifting rod, the lifting rod penetrates through the through groove to be connected with the inner sleeve tube, and a sealing member is mounted at the through groove.
5. The air-oxygen mixer for oxygen-enriched ignition of claim 4, wherein the sealing element is a dynamic and static sealing component or a soft sealing sleeve covering the rack and the through groove.
6. An air-oxygen mixer for oxygen-enriched ignition according to any of claims 1 to 5, wherein the axes of the inner sleeve, the second pipe section and the mixer main pipe are coincident.
7. An air-oxygen mixer for oxygen-enriched ignition according to any one of claims 1 to 5, wherein each group of oxygen ejection holes has a plurality of oxygen ejection holes arranged along the circumferential direction of the second pipe section.
8. A control method of an oxygen-rich ignition air-oxygen mixer, characterized in that the oxygen-rich ignition air-oxygen mixer according to any one of claims 1 to 7 is used, the control method comprising: the inner sleeve is driven to lift by the inner sleeve lifting driving mechanism, so that the inner sleeve is positioned at different heights to block oxygen spraying holes with different groups.
9. The control method of the air-oxygen mixer for oxygen-enriched ignition according to claim 8, wherein the control method comprises the steps of:
a. according to the oxygen concentration C of the mixed gas sprayed from the mixed gas outlet and the air flow Q entering from the air inletairThe oxygen flow Q of the oxygen delivery pipe is calculated according to the following formulaO2Target value of (c):
wherein
The value range of C is 0.23-0.31;
b. the oxygen flow adjustment coefficient R is calculated according to the following formula:
c. The number of groups of oxygen ejection holes blocked by the inner tube is determined based on the value of R, and the smaller the value of R, the larger the number of groups of oxygen ejection holes blocked by the inner tube.
10. The control method of the air-oxygen mixer for oxygen-rich ignition according to claim 9, further comprising:
in the step b, the oxygen flow of the middle oxygen delivery pipe is taken as the reference oxygen flow when the oxygen-enriched concentration is 0.23
The sectional area A0 of the oxygen jet holes in a single group is designed to make the oxygen jet flow velocity V of the oxygen jet holesO2Is 20m/s, in this case
Is 0.026QairThe calculation formula is as follows:
11. the control method of the air-oxygen mixer for oxygen-rich ignition according to claim 9, further comprising: in the step c, the number of groups in which the inner tube blocks the oxygen ejection holes is determined based on the value of R as follows:
when R belongs to [1,1.5), the inner sleeve is moved to the first station, and the inner sleeve seals all groups of oxygen spraying holes above the first group of oxygen spraying holes,
when R epsilon is 1.5,2.5), the inner sleeve pipe is moved to a second station, at the moment, the inner sleeve pipe blocks all groups of oxygen spraying holes above the first group and the second group of oxygen spraying holes,
when R is equal to [2.5,3.5), the inner sleeve moves to a third station, and the inner sleeve blocks all groups of oxygen spraying holes above the first group, the second group and the third group of oxygen spraying holes,
when R is equal to [3.5,4.5), the inner sleeve moves to a fourth station, the inner sleeve seals all groups of oxygen spraying holes above the first group, the second group, the third group and the fourth group of oxygen spraying holes,
when R is equal to 4.5,5.5), the inner sleeve moves to a fifth station, the inner sleeve seals all groups of oxygen spraying holes above the first group, the second group, the third group, the fourth group and the fifth group of oxygen spraying holes,
and when the R belongs to [5.5,6], the inner sleeve moves to a sixth station, and the inner sleeve blocks all the groups of oxygen spraying holes above the first group, the second group, the third group, the fourth group, the fifth group and the sixth group of oxygen spraying holes.
12. The control method of an air-oxygen mixer for oxygen-enriched ignition according to claim 11, further comprising the step of adjusting the flow rate of oxygen by means of a regulating valve and a flow meter on the oxygen delivery pipe.
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