CN113477108B - 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 PDF

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CN113477108B
CN113477108B CN202110475970.7A CN202110475970A CN113477108B CN 113477108 B CN113477108 B CN 113477108B CN 202110475970 A CN202110475970 A CN 202110475970A CN 113477108 B CN113477108 B CN 113477108B
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oxygen
air
mixer
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generator
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CN113477108A (en
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刘前
何璐瑶
周浩宇
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Zhongye Changtian International Engineering Co Ltd
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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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 delivery pipe and a streaming generation device, 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 delivery pipe penetrates through the side wall of the mixer main pipe, the oxygen inlet is positioned outside the mixer main pipe, the oxygen outlet is positioned inside the mixer main pipe, the streaming generation device is arranged between the air inlet and the oxygen outlet, the streaming generation device comprises an oxygen side streaming generation body and an air side streaming generation body, the upper end of the oxygen side streaming generation body forms a semicircular ball part with a convex surface facing the oxygen outlet, the air side streaming generation body forms a conical ball part with a tip facing the air inlet, and the air-oxygen-enriched ignition air mixer for oxygen-enriched ignition and the control method thereof aim to solve the problems of large pressure drop of mixed gas of the air-oxygen mixer in the prior art, The mixing effect is poor.

Description

Air-oxygen mixer for oxygen-enriched ignition and control method thereof
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 a mixer in the prior art.
(II) technical scheme
In order to solve the technical problems, the invention provides an air-oxygen mixer for oxygen-enriched ignition, which comprises a mixer main pipe, an oxygen conveying pipe and a streaming generation device, 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 penetrates through the side wall of the mixer main pipe, the oxygen inlet of the oxygen conveying pipe is positioned outside the mixer main pipe, the oxygen outlet of the oxygen conveying pipe is positioned inside the mixer main pipe and faces the air inlet, the streaming generation device is arranged inside the mixer main pipe and is positioned between the air inlet and the oxygen outlet, the streaming generation device comprises an oxygen side streaming generation body and an air side streaming generation body, the oxygen side streaming generation body and the air side streaming generation body are respectively and independently vertically moved, the upper end of the oxygen side-winding flow generator forms a semi-circular ball part with a convex surface facing the oxygen outlet, and the air side-winding flow generator forms a conical ball part with a tip facing the air inlet.
Preferably, the bypass flow generating device further comprises a fixing rod connected to the inner wall of the mixer main pipe, a fixing sleeve connected to the fixing rod, and a bracket disposed in the fixing sleeve, wherein the upper portion of the bracket is connected to the oxygen side bypass flow generating body through a first up-down telescopic driving device, the lower portion of the bracket is connected to the air side bypass flow generating body through a second up-down telescopic driving device, the lower portion of the oxygen side bypass flow generating body is accommodated in the fixing sleeve, and the upper portion of the air side bypass flow generating body is accommodated in the fixing sleeve.
Preferably, the flow-around generating means further comprises a first sealing ring disposed between a lower portion of the oxygen-side flow-around generating body and an inner wall of the fixing sleeve, and a second sealing ring disposed between an upper portion of the air-side flow-around generating body and the inner wall of the fixing sleeve.
Preferably, the first up-down telescopic driving device and the second up-down telescopic driving device are hydraulic cylinders respectively.
Preferably, the oxygen delivery pipe is provided with a swirl plate inside near the oxygen outlet.
Preferably, the oxygen delivery pipe comprises a horizontal pipe section penetrating through the side wall of the mixer main pipe and a bent pipe section connected with the horizontal pipe section, the bent pipe section is located inside the mixer main pipe, and the lower port of the bent pipe section is the oxygen outlet.
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 air injection flow rate of an air inlet is controlled by adjusting the vertical displacement of the air side-winding flow generator, and the oxygen injection flow rate of the oxygen outlet is controlled by adjusting the vertical displacement of the oxygen side-winding flow generator.
Preferably, the control method includes the steps of:
a. obtaining a target oxygen concentration C and a target air flow rate Qair，
b. 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):
Figure GDA0003540655700000041
wherein
Figure GDA0003540655700000042
The value range of C is 0.23-0.31;
c. the oxygen flow rate adjustment coefficients k1 and k2 are calculated according to the following formula:
k1＝Qair/Qair，0，
Figure GDA0003540655700000043
wherein Qair,0 is the target air flow and the initial air flow, respectively; qo2 Qo2,0 is the target oxygen flow and the initial oxygen flow, respectively;
d. judging whether the fluctuation of the air flow and the oxygen flow is too large, namely whether the following formula is established, if so, turning to the step i, and if not, turning to the step e:
Figure GDA0003540655700000044
wherein alpha is1Is the air fluctuation threshold, alpha2Is the oxygen fluctuation threshold, alpha3The air-oxygen ratio fluctuation threshold value is in the range of 1.1-1.4;
e. calculating x1And x2；
x1＝(L0-L)/tanα，x2＝Z-Z0
Wherein, alpha is the air side blunt body half cone angle, L0The horizontal distance between the oxygen side-winding current generator and the inner wall of the main pipe of the mixer under the initial working condition; l is the horizontal distance, Z, from the oxygen side-stream-winding generator to the inner wall of the main pipe of the mixer after adjustment0When the oxygen side-winding flow generator is at an initial station, the vertical distance from the center of the semi-spherical part of the oxygen side-winding flow generator to the oxygen outlet is Z, and the oxygen side-winding flow generator moves upwards by x2The horizontal distance between the oxygen side-winding current generator and the inner wall of the main pipe of the mixer;
f. moving the air side around the current generator down x1Moving the oxygen side up around the current generator x2；
g. Adjusting the flow of air and oxygen in the main tube of the mixer to a target value QairAnd QO2；
h. Reset to make
Figure GDA0003540655700000059
Figure GDA0003540655700000051
Qair,0＝Qair、
Figure GDA0003540655700000058
Skipping to step j;
i. adjusting the flow of air and oxygen in the main tube of the mixer to a target value QairAnd QO2；
j. Judgment targets C and QairIf so, turning to the step a, otherwise, turning to the step k;
k. the control method ends.
Preferably, in the step a, C is a value within the range of 0.23-0.31.
Preferably, in said step d, α1、α2And alpha3The values of the two are 1.1-1.4.
Preferably, in said step e, L is calculated as follows,
Figure GDA0003540655700000053
in said step e, Z is calculated as follows,
Figure GDA0003540655700000054
Δ＝b2-4ac，a＝1，
Figure GDA00035406557000000510
c＝-1，
Figure GDA0003540655700000056
wherein r is the radius of the oxygen conveying pipe, l is the distance from the outlet edge of the oxygen conveying pipe to the center of the top surface of the semi-spherical part,
Figure GDA0003540655700000057
the area of the oxygen passage between the oxygen side-winding flow generator and the inner wall of the main pipe of the mixer.
(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 invention, oxygen is injected into the mixing chamber from the oxygen nozzle at high speed, and is mixed with air in a counter-flow mode by utilizing the characteristics of high oxygen pressure and high oxygen flow rate. 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 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.
When oxygen and air flow through the bypass generating device, two intersected bypasses are formed around the bypass generating device to complete mixing of the two gases, and the oxygen flow rate and the air flow rate can be conveniently and flexibly controlled to meet the required requirements by adjusting the upward movement position and the downward movement position of the bypass generating device.
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 an enlarged view of a bypass flow generating device according to an embodiment of the present invention;
fig. 3 is a schematic structural view corresponding to the principle of air flow rate control in the method for controlling an oxygen-rich ignition air-oxygen mixer according to the embodiment of the present invention;
FIG. 4 is a schematic structural diagram corresponding to the principle of oxygen flow rate control in the method for controlling an air-oxygen mixer for oxygen-enriched ignition according to the embodiment of the present invention;
FIG. 5 is a simplified flow diagram of a method of controlling an air-oxygen mixer for oxygen-rich ignition according to an embodiment of the present invention;
fig. 6 is a schematic diagram of simulation when the air-oxygen mixer for oxygen-enriched ignition according to the embodiment of the present invention is used.
Description of reference numerals:
100. the mixer is responsible for, 101, air inlet, 102, gas mixture export, 103, mixing chamber, 200, oxygen delivery pipe, 201, oxygen inlet, 202, oxygen outlet, 203, spinning disk, 300, the stream generating device that flows, 301, the oxygen side stream generating body, 302, the air side stream generating body, 303, dead lever, 304, fixed cover, 305, support, 306, first flexible drive arrangement from top to bottom, 307, the flexible drive arrangement from top to bottom of second, 308, first sealing ring, 309, the second sealing ring.
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 than those specifically described herein, and it will be apparent to those skilled in the art that many more modifications are possible without departing from the spirit and scope of the 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 and 2, the present invention provides an air-oxygen mixer for oxygen-enriched ignition, comprising a mixer main pipe 100 (forming a mixing cavity 103 inside), an oxygen delivery pipe 200 and a bypass flow generator 300, wherein the lower end of the mixer main pipe 100 is provided with an air inlet 101, the upper end of the mixer main pipe 100 is provided with a mixed gas outlet 102, the oxygen delivery pipe 200 penetrates through the side wall of the mixer main pipe 100, the oxygen inlet 201 of the oxygen delivery pipe 200 is located outside the mixer main pipe 100, the oxygen outlet 202 of the oxygen delivery pipe 200 is located inside the mixer main pipe 100 and faces the air inlet 101, the bypass flow generator 300 is located inside the mixer main pipe 100 and between the air inlet 101 and the oxygen outlet 202, the bypass flow generator 300 comprises an oxygen side bypass flow generator 301 (also called oxygen side bluff body) and an air side bypass flow generator 302 (also called air side bluff body) located below the oxygen side bypass flow generator 301, the upper end of the oxygen side winding flow generator 301 forms a semi-circular ball part with a convex surface facing the oxygen outlet 202, the air side winding flow generator 302 forms a conical ball part with a tip facing the air inlet 101, and when oxygen and air flow through the winding flow generator 300, two intersecting winding flows are formed around the winding flow generator 300, so that the mixing of the two gases is completed.
According to the embodiment of the present invention, the bypass flow generating device 300 further includes a fixing rod 303 connected to the inner wall of the mixer main pipe 100, a fixing housing 304 connected to the fixing rod 303, and a bracket 305 provided in the fixing housing 304, an upper portion of the bracket 305 is connected to the oxygen-side bypass flow generating body 301 by a first up-down telescopic driving device 306, a lower portion of the bracket 305 is connected to the air-side bypass flow generating body 302 by a second up-down telescopic driving device 307, a lower portion of the oxygen-side bypass flow generating body 301 is accommodated in the fixing housing 304, the apparatus 300 for generating a circumferential flow of air-side circumferential flow of generator 302 received in the stationary sheath 304 further comprises a first sealing ring 308 disposed between the lower portion of the oxygen-side circumferential flow of generator 301 and the inner wall of the stationary sheath 304 and a second sealing ring 309 disposed between the upper portion of the air-side circumferential flow of generator 302 and the inner wall of the stationary sheath 304 (the first and second sealing rings are preferably, but not limited to, double layer sealing rings).
According to the preferred embodiment of the present invention, the first up-down telescopic driving device 306 and the second up-down telescopic driving device 307 are hydraulic cylinders, respectively, and the inner portion of the oxygen delivery pipe 200 is provided with the swirl plate 203 near the oxygen outlet 202 to guide the oxygen to form a swirl flow when the oxygen exits the oxygen delivery pipe 200, so as to enhance the mixing effect, but these preferred embodiments can be flexibly replaced.
As a specific embodiment, the oxygen delivery pipe 200 includes a horizontal pipe section penetrating the side wall of the mixer main pipe 100 and a bent pipe section connecting the horizontal pipe section, the bent pipe section is located inside the mixer main pipe 100, and the lower port of the bent pipe section is the oxygen outlet 202, but the specific structural form of the oxygen delivery pipe 200 is obviously not limited thereto.
Referring to fig. 3 to fig. 6, the present invention further provides a control method of an oxygen-rich ignition air-oxygen mixer, where the control method includes: the air injection flow rate of the air inlet 101 is controlled by adjusting the vertical displacement of the air-side-winding current generator 302, and the oxygen ejection flow rate of the oxygen outlet 202 is controlled by adjusting the vertical displacement of the oxygen-side-winding current generator 301.
As a specific embodiment, the control method includes the steps of:
a. obtaining a target oxygen concentration C and a target air flow rate QairWherein the target oxygen concentration C is determined by the fuel heating value,
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.
b. According to the oxygen concentration C of the mixed gas ejected from the mixed gas outlet 102 and the air flow Q entering from the air inlet 101airThe oxygen flow rate Q of the oxygen delivery pipe 200 is calculated as followsO2Target value of (c):
Figure GDA0003540655700000101
wherein
Figure GDA0003540655700000102
The value range of C is 0.23-0.31;
c. the oxygen flow rate adjustment coefficients k1 and k2 are calculated according to the following formula:
k1＝Qair/Qair，0，
Figure GDA0003540655700000103
wherein Qair,0 is the target air flow and the initial air flow, respectively; qo2 Qo2,0 is the target oxygen flow and the initial oxygen flow, respectively;
d. judging whether the following formula is satisfied, if yes, turning to the step i, and if not, turning to the step e (simply called judgment 1):
Figure GDA0003540655700000104
wherein alpha is1Is the air fluctuation threshold, alpha2Is the oxygen fluctuation threshold, alpha3Adjusting the position of the bypass flow generating device 300 when the fluctuation of the flow rate of the air and oxygen exceeds a threshold value for the fluctuation threshold value of the air and oxygen ratio, and not adjusting the position of the bypass flow generating device 300 when the fluctuation of the flow rate is within the threshold value range, specifically, not adjusting the position of the bluff body when the fluctuation amounts k1 and k2 satisfy the above relation, or otherwise, adjusting the bluff body to the corresponding position, wherein alpha is1、α2And alpha3Generally, 1.1 to 1.4 can be selected;
e. calculating x1And x2Besides the following formula, the specific calculation formula can adopt other various suitable formulas;
x1＝(L0-L)/tanα，x2＝Z-Z0
wherein, alpha is the air side blunt body half cone angle, L0The horizontal distance between the oxygen side-winding current generator and the inner wall of the main pipe of the mixer under the initial working condition; l is the horizontal distance, Z, from the oxygen side-stream-winding generator to the inner wall of the main pipe of the mixer after adjustment0When the oxygen side-winding flow generator is at an initial station, the vertical distance from the sphere center of the semi-spherical part of the oxygen side-winding flow generator to the oxygen outlet is Z, and the oxygen side-winding flow generator moves upwards by x2The horizontal distance of the oxygen side-stream-winding generator from the inner wall of the main pipe of the mixer, specifically, in step e, L is calculated as follows,
Figure GDA0003540655700000111
in said step e, Z is calculated as follows,
Figure GDA0003540655700000112
Δ＝b2-4ac，a＝1，
Figure GDA0003540655700000113
c＝-1，
Figure GDA0003540655700000114
wherein r is the radius of the oxygen delivery pipe 200, l is the distance from the outlet edge of the oxygen delivery pipe 200 to the center of the top surface of the semi-spherical part,
Figure GDA0003540655700000115
the area of an oxygen channel between the oxygen side-winding flow generator and the inner wall of the main pipe of the mixer is provided;
f. moving the air side around the current generator 302 down x1Moving the oxygen side up x around the current generator 3012；
g. Adjusting the flow of air and oxygen within the mixer main 100 to a target value QairAnd QO2；
h. Reset to make
Figure GDA0003540655700000118
Qair,0＝Qair、
Figure GDA0003540655700000119
Skipping to step j;
i. adjusting the flow of air and oxygen within the mixer main 100 to a target value QairAnd QO2Obviously and automatically adjusting to the next step j after the step is finished;
j. judgment targets C and QairIf the new change exists, turning to the step a, otherwise, turning to the step k (simply called judgment 2);
k. the control method ends. But the specific control method steps are obviously not limited thereto.
The derivation process of the related formula is as follows:
due to the fluctuation of the fuel calorific value, the oxygen concentration of the air-oxygen mixture outlet 102 is dynamically adjusted, which requires the corresponding adjustment of the oxygen flow. The oxygen concentration at the mixed gas outlet 102 is C, and the oxygen flow and the air flow are QO2 and Qair respectively, then:
Figure GDA0003540655700000121
target air flow rate QairDetermined by the amount of fuel, typically a fixed value;
at the initial station, the horizontal distance between the oxygen side-winding current generator 301 and the inner wall of the mixer main pipe 100 is L0The radius of the semi-spherical part is R0Then the air passage area between the air side-winding current generator 302 and the inner wall of the mixer main pipe 100 is calculated by the following equation:
Aair,0＝π·((L0+R0)2-R0 2)
at the reference air flow rate Qair,0Lower, the reference flow rate of air is Vair,0Comprises the following steps:
Figure GDA0003540655700000122
the air side-winding flow generator 302 moves downward x1At this time, the horizontal distance L from the outer edge of the air-side current generator 302 to the inner wall of the mixer main pipe 100 is calculated by the following equation:
L＝L0-x1·tanα
at this time, the air passage area A of the air passage area between the air side bypass flow generator 302 and the inner wall of the mixer main pipe 100airComprises the following steps:
Aair＝π·((L+R0)2-R0 2)
simultaneous Aair,0＝π·((L0+R0)2-R0 2) And Aair＝π·((L+R0)2-R0 2) The method comprises the following steps:
Figure GDA0003540655700000123
at actual air flow rate QairActual flow velocity V of airairComprises the following steps:
Figure GDA0003540655700000131
regulatingx1And (2) making:
Figure GDA0003540655700000132
i.e. can be at QairIn case of change, make VairThe horizontal distance L from the outer edge of the air-side current generator 302 to the inner wall of the mixer main pipe 100 is calculated by the following equation:
Figure GDA0003540655700000133
corresponding downward displacement x of the air side-winding current generator 3021：
x1＝(L0-L)/tanα
At the initial station, the vertical distance from the spherical center of the semi-spherical part of the oxygen side-winding current generator 301 to the oxygen outlet 202 is Z0The oxygen passage area between the oxygen side-winding current generator 301 and the inner wall of the mixer main tube 100 is calculated by the following equation:
Figure GDA0003540655700000134
the oxygen side-winding flow generator 301 moves upward through x2At this time, the oxygen passage area between the oxygen side-winding current generator 301 and the inner wall of the mixer main tube 100 is calculated by the following equation:
Figure GDA0003540655700000135
Z＝Z0-x2
wherein r is the radius of the oxygen delivery tube 200, l is the distance from the outlet edge of the oxygen delivery tube 200 to the center of the top surface of the hemispherical portion, l0The distance from the outlet edge of the oxygen delivery tube 200 to the center of the top surface of the hemispherical portion in the initial position is QO2In case of change, make VO2Remain unchanged, then shouldComprises the following steps:
Figure GDA0003540655700000141
then there are:
Figure GDA0003540655700000142
is composed of
Figure GDA0003540655700000143
Obtaining:
Figure GDA0003540655700000144
the formula for solving the root is as follows:
Figure GDA0003540655700000145
wherein Δ ═ b2-4ac，a＝1，
Figure GDA0003540655700000149
c＝-1
Is composed of
Figure GDA0003540655700000147
Z＝Z0-x2Comprises the following steps:
Figure GDA0003540655700000148
x2＝Z-Z0
fig. 6 shows simulation results for the present air-oxygen mixer for oxygen-enriched ignition. The oxygen concentration distribution at each position on the central cross section of the mixer is shown in the figure, and it can be seen from the figure that after the oxygen flow flowing in from the oxygen inlet and the air flow flowing in from the air inlet meet near the bypass flow generating device, intensive mixing occurs, and the oxygen concentration rapidly decreases to near the average concentration along the axial direction of the mixer. The oxygen concentration is substantially equal everywhere near the mixture outlet, indicating that the oxygen and air have been substantially mixed uniformly. The simulation result verifies the reasonability of the structure arrangement of the air-oxygen mixer for oxygen-enriched ignition.
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 (11)

1. The utility model provides an oxygen-enriched ignition is with empty oxygen blender, its characterized in that includes that the blender is responsible for, oxygen conveyer pipe and stream generating device, the air inlet has been seted up to the lower extreme that the blender is responsible for, the gas mixture export has been seted up to the upper end that the blender is responsible for, oxygen conveyer pipe link up the lateral wall that the blender is responsible for, oxygen inlet of oxygen conveyer pipe is located the outside that the blender is responsible for, oxygen outlet of oxygen conveyer pipe is located the inside that the blender is responsible for and towards air inlet, stream generating device sets up the blender is responsible for inside and is located air inlet with between the oxygen outlet, stream generating device includes that each can independently reciprocate oxygen side stream generator and is located the air side stream generator of oxygen side stream generator below, the upper end of oxygen side stream generator forms the convex surface towards the semicircle bulb portion of oxygen outlet, the air side-by-side flow generator forms a conical bulb with a tip facing the air inlet.
2. An air-oxygen mixer for oxygen-enriched ignition as claimed in claim 1, wherein the bypass flow generating device further comprises a fixing rod connected to the inner wall of the mixer main pipe, a fixing sheath connected to the fixing rod, and a bracket disposed in the fixing sheath, wherein the upper portion of the bracket is connected to the oxygen side bypass flow generating body by a first up-down telescopic driving device, the lower portion of the bracket is connected to the air side bypass flow generating body by a second up-down telescopic driving device, the lower portion of the oxygen side bypass flow generating body is accommodated in the fixing sheath, and the upper portion of the air side bypass flow generating body is accommodated in the fixing sheath.
3. An air-oxygen mixer for oxygen-enriched ignition according to claim 2, wherein the flow-around generating means further comprises a first seal ring disposed between a lower portion of the oxygen-side flow-around generating body and the inner wall of the jacket, and a second seal ring disposed between an upper portion of the air-side flow-around generating body and the inner wall of the jacket.
4. The air-oxygen mixer for oxygen-enriched ignition according to claim 2, wherein the first up-down telescopic driving means and the second up-down telescopic driving means are hydraulic cylinders, respectively.
5. An air-oxygen mixer for oxygen-enriched ignition according to any of claims 1 to 4, wherein a swirl plate is provided inside the oxygen delivery pipe near the oxygen outlet.
6. An air-oxygen mixer for oxygen-enriched ignition according to any of claims 1 to 4, wherein the oxygen delivery pipe comprises a horizontal pipe section penetrating through the side wall of the mixer main pipe and a bent pipe section connecting the horizontal pipe section, the bent pipe section is located inside the mixer main pipe, and the lower port of the bent pipe section is the oxygen outlet.
7. 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 6 is used, the control method comprising: the air injection flow rate of an air inlet is controlled by adjusting the vertical displacement of the air side-winding flow generator, and the oxygen injection flow rate of the oxygen outlet is controlled by adjusting the vertical displacement of the oxygen side-winding flow generator.
8. The control method of the air-oxygen mixer for oxygen-enriched ignition according to claim 7, wherein the control method comprises the steps of:
a. obtaining a target oxygen concentration C and a target air flow rate Qair，
b. 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):
Figure FDA0003540655690000021
wherein
Figure FDA0003540655690000031
The value range of C is 0.23-0.31;
c. the oxygen flow rate adjustment coefficients k1 and k2 are calculated according to the following formula:
k1＝Qair/Qair,0，
Figure FDA0003540655690000032
wherein Qair,0 is the target air flow and the initial air flow, respectively; qo2 Qo2,0 is the target oxygen flow and the initial oxygen flow, respectively;
d. judging whether the fluctuation of the air flow and the oxygen flow is too large, namely whether the following formula is established, if so, turning to the step i, and if not, turning to the step e:
Figure FDA0003540655690000033
wherein alpha is1Is the air fluctuation threshold, alpha2Is the oxygen fluctuation threshold, alpha3The air-oxygen ratio fluctuation threshold value is in the range of 1.1-1.4;
e. calculating x1And x2；
x1＝(L0-L)/tanα，x2＝Z-Z0
Wherein, alpha is the air side blunt body half cone angle, L0The horizontal distance between the oxygen side-winding current generator and the inner wall of the main pipe of the mixer under the initial working condition; l is the horizontal distance, Z, from the oxygen side-stream-winding generator to the inner wall of the main pipe of the mixer after adjustment0When the oxygen side-winding flow generator is at an initial station, the vertical distance from the sphere center of the semi-spherical part of the oxygen side-winding flow generator to the oxygen outlet is Z, and the oxygen side-winding flow generator moves upwards by x2The horizontal distance between the oxygen side-winding current generator and the inner wall of the main pipe of the mixer;
f. moving the air side around the current generator down x1Moving the oxygen side up around the current generator x2；
g. Adjusting the flow of air and oxygen in the main tube of the mixer to a target value QairAnd QO2；
h. Reset to L0＝L0-x1tanα、Z0＝Z0-x2、Qair,0＝Qair、
Figure FDA0003540655690000034
Skipping to step j;
i. adjusting the flow of air and oxygen in the main tube of the mixer to a target value QairAnd QO2；
j. Judgment targets C and QairIf so, turning to the step a, otherwise, turning to the step k;
k. the control method ends.
9. The method for controlling the air-oxygen mixer for oxygen-enriched ignition according to claim 8, wherein in the step a, C is a value in the range of 0.23-0.31.
10. The method of controlling an air-oxygen mixer for oxygen-rich ignition according to claim 8, wherein the air-oxygen mixer is provided in the air-oxygen mixer for oxygen-rich ignitionIn step d, α1、α2And alpha3The values of the two are 1.1-1.4.
11. The method of controlling an air-oxygen mixer for oxygen-rich ignition according to claim 8, wherein in the step e, L is calculated as follows,
Figure FDA0003540655690000041
in said step e, Z is calculated as follows,
Figure FDA0003540655690000042
Δ＝b2-4ac，a＝1，
Figure FDA0003540655690000043
c＝-1，
Figure FDA0003540655690000044
wherein r is the radius of the oxygen conveying pipe, l is the distance from the outlet edge of the oxygen conveying pipe to the center of the top surface of the semi-spherical part,
Figure FDA0003540655690000045
the area of the oxygen passage between the oxygen side-winding flow generator and the inner wall of the main pipe of the mixer.
CN202110475970.7A 2021-04-29 2021-04-29 Air-oxygen mixer for oxygen-enriched ignition and control method thereof Active CN113477108B (en)

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Citations (9)

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Publication number Priority date Publication date Assignee Title
US2767727A (en) * 1952-02-09 1956-10-23 Union Carbide & Carbon Corp Air-oxygen mixing apparatus for hospitals
GB1141888A (en) * 1965-06-18 1969-02-05 Basf Ag Mixing hydrocarbonaceous gases and/or vapours with oxygen or oxygen-containing gases
GB1206031A (en) * 1968-01-12 1970-09-23 Gen Dynamics Corp Method of and apparatus for producing substantially homogeneous quantities of microscopic gas bubbles
GB1417289A (en) * 1972-11-28 1975-12-10 Sulzer Ag Apparatus for mixing gaseous flows
CN102908920A (en) * 2012-11-08 2013-02-06 中国华电工程(集团)有限公司 Ammonia and air mixer for denitrification device
CN202823191U (en) * 2012-08-30 2013-03-27 江苏微浪电子科技有限公司 Fluid proportioning and mixing device
CN108525159A (en) * 2017-03-01 2018-09-14 中国石油化工股份有限公司 A kind of big flow foam-generating device and foam fire-fighting equipment
CN110906027A (en) * 2019-11-28 2020-03-24 上海佳晖流体工程技术有限公司 Mechanical proportional valve capable of being synchronously adjusted
CN111282462A (en) * 2020-04-13 2020-06-16 洛阳德明石化设备有限公司 Method for injecting mixer medium

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767727A (en) * 1952-02-09 1956-10-23 Union Carbide & Carbon Corp Air-oxygen mixing apparatus for hospitals
GB1141888A (en) * 1965-06-18 1969-02-05 Basf Ag Mixing hydrocarbonaceous gases and/or vapours with oxygen or oxygen-containing gases
GB1206031A (en) * 1968-01-12 1970-09-23 Gen Dynamics Corp Method of and apparatus for producing substantially homogeneous quantities of microscopic gas bubbles
GB1417289A (en) * 1972-11-28 1975-12-10 Sulzer Ag Apparatus for mixing gaseous flows
CN202823191U (en) * 2012-08-30 2013-03-27 江苏微浪电子科技有限公司 Fluid proportioning and mixing device
CN102908920A (en) * 2012-11-08 2013-02-06 中国华电工程(集团)有限公司 Ammonia and air mixer for denitrification device
CN108525159A (en) * 2017-03-01 2018-09-14 中国石油化工股份有限公司 A kind of big flow foam-generating device and foam fire-fighting equipment
CN110906027A (en) * 2019-11-28 2020-03-24 上海佳晖流体工程技术有限公司 Mechanical proportional valve capable of being synchronously adjusted
CN111282462A (en) * 2020-04-13 2020-06-16 洛阳德明石化设备有限公司 Method for injecting mixer medium

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