阅读说明：本技术 一种富氧点火用空氧混合器及其控制方法 (Air-oxygen mixer for oxygen-enriched ignition and control method thereof ) 是由 刘前 何璐瑶 周浩宇 于 2021-04-29 设计创作，主要内容包括：本发明公开了一种富氧点火用空氧混合器及其控制方法,富氧点火用空氧混合器包括混合器主管、氧气输送管以及绕流发生装置,混合器主管的下端开设有空气入口,混合器主管的上端开设有混合气出口,氧气输送管贯通混合器主管的侧壁,氧气入口位于混合器主管的外部,氧气出口位于混合器主管的内部,绕流发生装置设置在空气入口与氧气出口之间,绕流发生装置包括氧气侧绕流发生体和空气侧绕流发生体,氧气侧绕流发生体的上端形成凸面朝向所述氧气出口的半圆球部,空气侧绕流发生体形成尖端朝向空气入口的圆锥球部,该富氧点火用空氧混合器及其控制方法旨在解决现有技术中的空氧混合器混合气体的压降大、混合效果差的技术问题。(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.)

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 Q_air，

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 inlet_airThe oxygen flow Q of the oxygen delivery pipe is calculated according to the following formula_O2Target value of (c):

whereinThe 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＝Q_air/Q_air,0，

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 (relative to the initial flow) of the air flow and the oxygen flow is too large (exceeds a threshold), namely whether the following formula is satisfied, if so, turning to the step i, and if not, turning to the step e:

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 Q_airAnd Q_O2；

h. Reset to L₀＝L₀-x₁tanα、Z₀＝Z₀-x₂、Q_air,0＝Q_air、Skipping to step j;

i. adjusting the flow of air and oxygen in the main tube of the mixer to a target value Q_airAnd Q_O2；

j. Judgment targets C and Q_airIf 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 for controlling an air-oxygen mixer for oxygen-enriched ignition according to claim 8, wherein α is α in the step d₁、α₂And alpha₃The values of the two are 1.1-1.4.

11. The control method for an oxygen-rich ignition air-oxygen mixer as claimed in claim 8, wherein in said step e, L is calculated as follows,in said step e, Z is calculated as follows,Δ＝b²-4ac，a＝1，c＝-1，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,the area of the oxygen passage between the oxygen side-winding flow generator and the inner wall of the main pipe of the mixer.

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 bypass generating 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 bypass generating device is arranged inside the mixer main pipe and is positioned between the air inlet and the oxygen outlet, the bypass generating device comprises an oxygen side bypass generating body and an air side bypass generating body, the oxygen side bypass generating body and the air side bypass generating body are respectively capable of independently moving up and down, 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 Q_air，

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 inlet_airThe oxygen flow Q of the oxygen delivery pipe is calculated according to the following formula_O2Target value of (c):

whereinThe 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＝Q_air/Q_air,0，

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 (relative to the initial flow) of the air flow and the oxygen flow is too large (exceeds a threshold), namely whether the following formula is satisfied, if so, turning to the step i, and if not, turning to the step e:

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)/tan α，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 Q_airAnd Q_O2；

h. Reset to L₀＝L₀-x₁tan α、Z₀＝Z₀-x₂、Q_air,0＝Q_air、Skipping to step j;

i. adjusting the flow of air and oxygen in the main tube of the mixer to a target value Q_airAnd Q_O2；

j. Judgment targets C and Q_airIf 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,in said step e, Z is calculated as follows,Δ＝b²-4ac，a＝1，c＝-1，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,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 diagram corresponding to the air flow rate control principle in the control method of the air-oxygen mixer for oxygen-enriched ignition 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 a simulation structure of the air-oxygen mixer for oxygen-enriched ignition according to the embodiment of the present invention.

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 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 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 Q_airWherein 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 101_airThe oxygen flow rate Q of the oxygen delivery pipe 200 is calculated as follows_O2Target value of (c):

whereinThe 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＝Q_air/Q_air,0，

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):

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)/tan α，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,in said step e, Z is calculated as follows,Δ＝b²-4ac，a＝1，c＝-1，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,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 Q_airAnd Q_O2；

h. Reset to L₀＝L₀-x₁tanα、Z₀＝Z₀-x₂、Q_air,0＝Q_air、Skipping to step j;

i. adjusting the flow of air and oxygen within the mixer main 100 to a target value Q_airAnd Q_O2Obviously and automatically adjusting to the next step j after the step is finished;

j. judgment targets C and Q_airIf 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:target air flow rate Q_airDetermined 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:

A_air,0＝π·((L₀+R₀)²-R₀ ²)

at the reference air flow rate Q_air,0Lower, the reference flow rate of air is V_air,0Comprises the following steps:

air side-stream generator 302 moves down 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·tan α

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 100_airComprises the following steps:

A_air＝π·((L+R₀)²-R₀ ²)

simultaneous A_air,0＝π·((L₀+R₀)²-R₀ ²) And A_air＝π·((L+R₀)²-R₀ ²) The method comprises the following steps:

at actual air flow rate Q_airActual flow velocity V of air_airComprises the following steps:

regulating x₁And (2) making:

i.e. can be at Q_airIn case of change, make V_airThe 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:

corresponding downward displacement x of the air side-winding current generator 302₁：

x₁＝(L₀-L)/tan α

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:

the oxygen side-stream generator 301 moves up over 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:

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 Q_O2In case of change, make V_O2If left unchanged, then there should be:

then there are:

is composed ofObtaining:

the formula for solving the root is as follows:

wherein Δ ═ b²-4ac，a＝1，c＝-1

Is composed ofZ＝Z₀-x₂Comprises the following steps:

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 center cross section of the mixer is shown in the figure, and it can be seen from the figure that the oxygen flow from the oxygen inlet and the air flow from the air inlet meet near the bypass flow generating device, and then are intensively mixed, and the oxygen concentration rapidly drops 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 structural 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.