Optimization method and device of comprehensive injection device based on oxygen blast furnace

Abstract

The invention provides a method and a device for optimizing a comprehensive injection device based on an oxygen blast furnace. The method comprises the following steps: acquiring basic parameters of a to-be-optimized comprehensive injection device to construct a three-dimensional simulation model; according to the structural form parameters, the working parameters and the injection parameters, injection simulation is conducted on the three-dimensional simulation model, and a simulation result is obtained; if the simulation result does not meet the optimization requirement, the parameters are updated, injection simulation is conducted again till the simulation result meets the optimization requirement, and the comprehensive injection device to be optimized is optimized according to the current structural form parameters, the working parameters and the injection parameters. According to the method, a numerical simulation method is adopted to calculate a temperature field, a velocity field and a pressure field formed by oxygen, pulverized coal and a main injection medium in a tuyere area of blast furnaces with different volumes under the working condition of furnace top gas circulation oxygen blast furnace smelting. By controlling the mixing uniformity of oxygen and pulverized coal, sufficient combustion of the pulverized coal is ensured, the relative position relation of the oxygen-coal lance is optimized, interaction conflicts between injection devices are avoided, and the maintenance difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking in the metallurgical industry, and in particular to an optimization method and device for a comprehensive blowing device based on an oxygen blast furnace. Background Art

[0002] Blast furnace ironmaking is the core link of steel production, and the use of pulverized coal as a reducing agent directly affects production efficiency and quality. With environmental protection requirements and the trend of low-carbon development, the top gas circulation oxygen blast furnace, as a new type of low-carbon ironmaking technology, improves combustion efficiency, reduces coal dependence, and increases output and quality through comprehensive injection of pulverized coal, oxygen and coal gas, with significant advantages in energy saving and emission reduction.

[0003] However, despite the progress made in combustion efficiency and blast furnace production capacity, the existing oxygen blast furnace injection technology still has some challenges and limitations. First, the mixing uniformity control is insufficient, and oxygen and coal powder are difficult to mix evenly, resulting in incomplete or inefficient combustion of some coal powder, affecting production efficiency. Second, the relative position and angle between the injection devices are not optimized enough, which is prone to conflict, affecting the injection effect and increasing the risk of equipment failure. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides an optimization method and device for a comprehensive injection device based on an oxygen blast furnace to solve the problem of incomplete combustion or low efficiency of some coal powder.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] The first aspect of the present invention discloses an optimization method for a comprehensive blowing device based on an oxygen blast furnace, the method comprising:

[0007] Obtaining basic parameters of the comprehensive blowing device to be optimized and a plurality of preset working condition test parameters; the plurality of preset working condition test parameters include structural form parameters, working parameters and blowing parameters;

[0008] Constructing a three-dimensional simulation model based on the simulation engineering software and the basic parameters;

[0009] According to the structural form parameters, the working parameters and the blowing parameters, the three-dimensional simulation model is subjected to blowing simulation to obtain a simulation result;

[0010] If the simulation result does not meet the optimization requirement, the structural form parameters, the working parameters and the blowing parameters are updated, and the process returns to the step of performing blowing simulation on the three-dimensional simulation model according to the structural form parameters, the working parameters and the blowing parameters to obtain the simulation result;

[0011] If the simulation result meets the optimization requirements, the comprehensive blowing device to be optimized is optimized according to the current structural parameters, working parameters and blowing parameters.

[0012] Preferably, if the simulation result meets the optimization requirements, after optimizing the comprehensive blowing device to be optimized according to the current structural form parameters, working parameters and blowing parameters, the method further includes:

[0013] Verifying the optimized comprehensive blowing device to be optimized based on the current structural parameters, working parameters and blowing parameters to obtain a verification result;

[0014] An optimization report is generated and outputted according to the verification results.

[0015] Preferably, the updating of the structural parameters, the operating parameters and the blowing parameters includes:

[0016] According to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters, the structural form parameters are updated;

[0017] The working parameters are updated based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters;

[0018] The blowing parameters are updated according to the gas blowing amount in the basic parameters.

[0019] Preferably, the updating of the structural form parameters according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters includes:

[0020] The position parameter of the oxygen lance in the structural form parameter is set to the upper part of the position parameter of the coal injection lance in the basic parameter, and the outlet position of the oxygen lance in the structural form parameter is set to the outlet position of the oxygen lance of the comprehensive injection device to be optimized;

[0021] Or: setting the position parameter of the oxygen lance in the structural form parameter to the lower part of the position parameter of the coal injection gun in the basic parameter, and setting the outlet position of the oxygen lance in the structural form parameter to be flush with the outlet position of the coal injection gun in the basic parameter;

[0022] Or: setting the position parameter of the oxygen lance in the structural form parameter to the front of the position parameter of the coal injection gun in the basic parameter;

[0023] The outlet position of the oxygen lance in the structural form parameters is determined according to the outlet position of the oxygen lance of the integrated injection device to be optimized and the outlet position of the coal injection lance in the basic parameters.

[0024] Preferably, the updating of the working parameters based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters comprises:

[0025] Calculate the target oxygen lance radius according to the pressure difference between the oxygen blast furnace and the outside, the injection gas density and the injection gas flow rate of the oxygen lance in the basic parameters;

[0026] Calculating the difference between the target oxygen spray gun radius and the radius parameter of the oxygen spray gun in the basic parameters, and updating the radius parameter of the oxygen spray gun in the working parameters according to the difference;

[0027] Calculate the insertion depth variation according to the oxygen blast furnace volume parameter in the basic parameters;

[0028] updating the insertion depth parameter of the oxygen spray gun in the working parameters according to the insertion depth variation;

[0029] The insertion angle parameter of the oxygen spray gun in the working parameters is updated according to the insertion angle parameter of the oxygen spray gun in the basic parameters and the preset angle change value.

[0030] Preferably, updating the injection parameter according to the gas injection amount in the basic parameter includes:

[0031] Get the preset blowing change value;

[0032] The blowing parameters are updated according to the gas blowing amount in the basic parameters and the preset blowing change value.

[0033] The second aspect of the present invention discloses an optimization device for a comprehensive blowing device based on an oxygen blast furnace, the device comprising:

[0034] An acquisition unit, used to acquire basic parameters of the comprehensive blowing device to be optimized and a plurality of preset working condition test parameters; the plurality of preset working condition test parameters include structural form parameters, working parameters and blowing parameters;

[0035] A construction unit, used for constructing a three-dimensional simulation model based on the simulation engineering software and the basic parameters;

[0036] A simulation unit, used for performing a blowing simulation on the three-dimensional simulation model according to the structural form parameters, the working parameters and the blowing parameters to obtain a simulation result;

[0037] An updating unit, for updating the structural parameters, the operating parameters and the blowing parameters if the simulation result does not meet the optimization requirements, and returning to the simulation execution unit;

[0038] The optimization unit is used to optimize the comprehensive blowing device to be optimized according to the current structural parameters, working parameters and blowing parameters if the simulation result meets the optimization requirements.

[0039] Preferably, the device further comprises:

[0040] A verification unit, used for verifying the optimized comprehensive blowing device to be optimized based on current structural parameters, working parameters and blowing parameters, and obtaining a verification result;

[0041] The output unit is used to generate and output an optimization report based on the verification result.

[0042] Preferably, the updating unit comprises:

[0043] A first updating module is used to update the structural form parameters according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters;

[0044] A second updating module, used for updating the working parameters based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters;

[0045] The third updating module is used to update the blowing parameters according to the gas blowing amount in the basic parameters.

[0046] Preferably, the first update module is specifically used for:

[0047] The position parameter of the oxygen lance in the structural form parameters is set to the upper part of the position parameter of the coal injection gun in the basic parameters, and the outlet position of the oxygen lance in the structural form parameters is set to the outlet position of the oxygen lance of the comprehensive injection device to be optimized; or; the position parameter of the oxygen lance in the structural form parameters is set to the lower part of the position parameter of the coal injection gun in the basic parameters, and the outlet position of the oxygen lance in the structural form parameters is set to be flush with the outlet position of the coal injection gun in the basic parameters; or; the position parameter of the oxygen lance in the structural form parameters is set to the front part of the position parameter of the coal injection gun in the basic parameters; according to the outlet position of the oxygen lance of the comprehensive injection device to be optimized and the outlet position of the coal injection gun in the basic parameters, the outlet position of the oxygen lance in the structural form parameters is determined.

[0048] Based on the above-mentioned embodiment of the present invention, an optimization method and device for a comprehensive blowing device based on an oxygen blast furnace are provided, and the basic parameters of the comprehensive blowing device to be optimized are obtained to construct a three-dimensional simulation model; according to the structural form parameters, working parameters and blowing parameters, the three-dimensional simulation model is subjected to blowing simulation to obtain a simulation result; if the simulation result does not meet the optimization requirements, the parameters are updated and the blowing simulation is performed again until the simulation result meets the optimization requirements, and the comprehensive blowing device to be optimized is optimized according to the current structural form parameters, working parameters and blowing parameters. This method adopts a numerical simulation method to calculate the temperature field, velocity field and pressure field formed by oxygen, pulverized coal and main blowing medium in the tuyere area of ​​blast furnaces of different volumes under the working conditions of top gas circulation oxygen blast furnace smelting. By controlling the mixing uniformity of oxygen and pulverized coal, the pulverized coal is ensured to be fully burned, the relative position relationship of the oxygen-coal gun is optimized, the interaction conflict between the blowing devices is avoided, and the maintenance difficulty is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0050] Figure 1 A flowchart of an optimization method for a comprehensive blowing device based on an oxygen blast furnace provided in an embodiment of the present invention;

[0051] Figure 2 A schematic diagram of a three-dimensional physical numerical model provided by an embodiment of the present invention;

[0052] Figure 3 A schematic diagram of mesh division of a three-dimensional physical model provided in an embodiment of the present invention;

[0053] Figure 4 A schematic diagram of a velocity field provided by an embodiment of the present invention;

[0054] Figure 5 A schematic diagram of a temperature field provided by an embodiment of the present invention;

[0055] Figure 6 A schematic diagram of a gas distribution field provided in an embodiment of the present invention;

[0056] Figure 7 A distribution diagram of coal powder combustion trajectories provided in an embodiment of the present invention;

[0057] Figure 8 A structural block diagram of an optimization device for a comprehensive blowing device based on an oxygen blast furnace provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0060] From the background technology, it can be seen that the existing oxygen blast furnace injection technology still faces some problems in combustion efficiency and production capacity: first, the oxygen and coal powder are not mixed evenly, resulting in incomplete combustion of coal powder, affecting efficiency; second, the position and angle of the injection device are not well optimized, which may cause conflicts, affect the effect and increase the risk of equipment failure.

[0061] Therefore, the embodiment of the present invention provides an optimization method and device for a comprehensive blowing device based on an oxygen blast furnace, obtains the basic parameters of the comprehensive blowing device to be optimized to construct a three-dimensional simulation model; performs blowing simulation on the three-dimensional simulation model according to the structural form parameters, working parameters and blowing parameters to obtain simulation results; if the simulation results do not meet the optimization requirements, the parameters are updated and the blowing simulation is performed again until the simulation results meet the optimization requirements, and the comprehensive blowing device to be optimized is optimized according to the current structural form parameters, working parameters and blowing parameters. This method adopts a numerical simulation method to calculate the temperature field, velocity field and pressure field formed by oxygen, pulverized coal and main blowing medium in the tuyere area of ​​blast furnaces of different volumes under the working conditions of top gas circulation oxygen blast furnace smelting. By controlling the mixing uniformity of oxygen and pulverized coal, the pulverized coal is ensured to be fully burned, the relative position relationship of the oxygen-coal gun is optimized, the interaction conflict between the blowing devices is avoided, and the maintenance difficulty is reduced.

[0062] See also Figure 1 , showing a flow chart of an optimization method for a comprehensive blowing device based on an oxygen blast furnace provided in an embodiment of the present invention.

[0063] It should be noted that the embodiment of the present invention specifically optimizes the comprehensive injection device based on the oxygen blast furnace. The comprehensive injection device based on the oxygen blast furnace is a comprehensive injection device of oxygen, pulverized coal, and main injection medium, that is, a pure oxygen and pulverized coal comprehensive injection system of the top gas circulation oxygen blast furnace.

[0064] It is understood that this optimization method is applicable to oxygen blast furnaces with a volume greater than 380m 3 ~5000m 3 The optimization method for the tuyere area of ​​an oxygen blast furnace includes:

[0065] Step S101: Obtain basic parameters of the comprehensive blowing device to be optimized and multiple preset operating condition test parameters.

[0066] In the process of implementing step S101, basic parameters of the comprehensive injection device to be optimized are obtained, including but not limited to position parameters of the coal injection gun, position parameters of the direct blowing pipe, gas injection volume and oxygen blast furnace volume, as well as multiple preset operating condition test parameters.

[0067] It should be noted that the multiple preset operating condition test parameters include structural parameters, working parameters and injection parameters.

[0068] It can be understood that the basic parameters of the comprehensive blowing device to be optimized are shown in Table 1.

[0069]

[0070] Step S102: constructing a three-dimensional simulation model based on simulation engineering software and basic parameters.

[0071] In the specific implementation of step S102, simulation engineering software (such as ANSYS, Inc.) is used to construct a corresponding three-dimensional simulation model based on the basic parameters of the integrated blowing device to be optimized.

[0072] It can be understood that the three-dimensional physical numerical model (such as Figure 2 ), and perform corresponding mesh division (as shown in Figure 3 As shown in Figure 3), a three-dimensional simulation model is obtained.

[0073] It should be noted that when establishing a three-dimensional physical numerical model, it is necessary to set various conditions of the model, including model solution conditions, boundary conditions, and reaction material setting conditions.

[0074] Step S103: performing a blowing simulation on the three-dimensional simulation model according to the structural form parameters, the working parameters and the blowing parameters to obtain a simulation result.

[0075] In the process of implementing step S103, in the M.Hatano model, for example, different blowing conditions are simulated on the three-dimensional simulation model according to the structural parameters, working parameters and blowing parameters in a plurality of preset working condition test parameters to obtain simulation results.

[0076] It should be noted that when performing the injection simulation, the composition of the injected gas is as shown in Table 2.

[0077]

[0078] It can be understood that the optimization requirements are obtained, and it is determined whether the simulation results meet the optimization requirements. If the simulation results do not meet the optimization requirements, step S104 is executed; if the simulation results meet the optimization requirements, step S105 is executed.

[0079] Step S104: If the simulation result does not meet the optimization requirements, the structural parameters, working parameters and injection parameters are updated, and the process returns to step S103.

[0080] In the process of implementing step S104, when the simulation result does not meet the optimization requirements, the structural form parameters, working parameters and blowing parameters are updated, and the process returns to step S103, and the three-dimensional simulation model is subjected to blowing simulation using the updated structural form parameters, working parameters and blowing parameters to obtain the simulation result again.

[0081] It should be noted that when the simulation results do not meet the optimization requirements, the structural parameters are updated according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters; the working parameters are updated based on the radius parameters of the oxygen injection gun and the volume parameters of the oxygen blast furnace in the basic parameters; the injection parameters are updated according to the gas injection amount in the basic parameters, and the parameters are combined according to the updated structural parameters, working parameters and injection parameters, and the injection simulation is performed on the three-dimensional simulation model to obtain a parameter combination that meets the optimization requirements.

[0082] It can be understood that the injection simulation of the three-dimensional simulation model is specifically the calculation of the velocity field, temperature field, gas distribution field, coal powder particle burnout distribution and coal powder burnout rate of the spray gun, tuyere sleeve and cyclotron zone.

[0083] The following is an explanation of the process of updating the structural parameters, working parameters and injection parameters. First, according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters, the structural parameters are updated, specifically (such as process A1 to process A4):

[0084] Process A1: Set the position parameter of the oxygen lance in the structural form parameters to the upper part of the position parameter of the coal injection gun in the basic parameters, and set the outlet position of the oxygen lance in the structural form parameters to the outlet position of the oxygen lance of the integrated injection device to be optimized.

[0085] It can be understood that the position of the coal injection gun in the three-dimensional simulation model is kept unchanged, the position of the oxygen injection gun is set on the upper part of the coal injection gun, and the outlet position of the oxygen injection gun in the structural form parameters is set according to the arrangement distance between the oxygen injection gun and the coal injection gun in the integrated injection device to be optimized.

[0086] Taking Table 3 as an example, when the oxygen lance is arranged on the upper part of the coal injection lance, the distance between the outlet position of the oxygen lance and the end of the straight blowing pipe is 100 mm.

[0087]

[0088] Process A2: setting the position parameter of the oxygen lance in the structural form parameters to the lower part of the position parameter of the coal lance in the basic parameters, and setting the outlet position of the oxygen lance in the structural form parameters to be flush with the outlet position of the coal lance in the basic parameters.

[0089] It is understandable that, in addition to the updating method shown in process A1, the position of the coal injection gun in the three-dimensional simulation model can be kept unchanged, the position of the oxygen injection gun can be set below the coal injection gun, and the outlet position of the oxygen injection gun can be set at a position flush with the coal injection gun.

[0090] Taking Table 3 as an example, when the oxygen lance is arranged at the lower part of the coal injection lance, the distance between the outlet position of the oxygen lance and the end of the straight blowing pipe is 136 mm.

[0091] Process A3: The position parameters of the oxygen lance in the structural form parameters are set to the front of the position parameters of the coal injection lance in the basic parameters.

[0092] It can be understood that, in addition to the updating methods shown in process A1 and process A2, the position of the oxygen lance can also be set to the front of the coal injection lance by keeping the position of the coal injection lance in the three-dimensional simulation model unchanged.

[0093] It should be noted that the oxygen lance and the coal injection lance are not set on the same axis during the actual setting process. Therefore, the oxygen lance can be set at the upper part and front part of the coal injection lance or at the lower part and front part of the coal injection lance.

[0094] Process A4: Determine the outlet position of the oxygen lance in the structural form parameters according to the outlet position of the oxygen lance of the integrated injection device to be optimized and the outlet position of the coal injection lance in the basic parameters.

[0095] Taking Table 3 as an example, when the oxygen lance is set at the front of the coal injection gun, the distance between the outlet position of the oxygen lance and the end of the straight blowpipe is the sum of the distances in the two examples shown in process A1 and process A2, that is, 100+136, or 236 mm.

[0096] Secondly, the working parameters are updated based on the radius parameters of the oxygen lance and the volume parameters of the oxygen blast furnace in the basic parameters, specifically (such as process B1 to process B5):

[0097] Process B1: Calculate the target oxygen lance radius according to the pressure difference between the oxygen blast furnace and the outside, the injection gas density of the oxygen lance, and the injection gas flow rate in the basic parameters.

[0098] Specifically, the target oxygen spray gun radius is calculated by formula (1) and formula (2).

[0099]

[0100] Among them, V 标 is the standard speed, in m / s; is the pressure difference between the oxygen blast furnace and the outside world in the basic parameters, in Pa; ρ is the density of the injected gas, in g / L; R is the radius of the oxygen lance, in m; V 流 is the injection gas flow rate, in m 3 / s; n is the number of seals in the three-dimensional simulation model.

[0101] Process B2: Calculate the difference between the target oxygen spray gun radius and the radius parameter of the oxygen spray gun in the basic parameters, and update the radius parameter of the oxygen spray gun in the working parameters according to the difference.

[0102] It should be noted that for blast furnaces with smaller furnace capacity, the injection volume should not be too large, and the pipe diameter size should not be too large. Therefore, a symmetrical distribution is selected, and the difference between the target oxygen spray gun radius and the radius parameter of the oxygen spray gun in the basic parameters is used as the radius gradient. Starting from the radius of the oxygen spray gun of the comprehensive injection device to be optimized, multiple radius gradients are increased or decreased in sequence to update the radius parameter of the oxygen spray gun in the working parameters.

[0103] Process B3: Calculate the insertion depth change according to the oxygen blast furnace volume parameter in the basic parameters.

[0104] For example, 1 / 50 times (or 1 / 100 times) the volume parameter of the oxygen blast furnace in the basic parameters is used as the insertion depth change.

[0105] It is understandable that when the oxygen blast furnace volume parameter in the basic parameters exceeds an integer less than or equal to 50m 3 When the value is greater than 50m, round down. 3 , then round up.

[0106] Process B4: updating the insertion depth parameter of the oxygen spray gun in the working parameters according to the insertion depth variation.

[0107] For example, starting from the insertion depth of the oxygen lance of the integrated blowing device to be optimized, multiple insertion depth variation amounts are sequentially added to update the insertion depth parameter of the oxygen lance in the working parameters.

[0108] Process B5: updating the insertion angle parameter of the oxygen spray gun in the working parameters according to the insertion angle parameter of the oxygen spray gun in the basic parameters and the preset angle change value.

[0109] It should be noted that if the volume of the oxygen blast furnace is less than 2000m 3 The appropriate gas injection amount can be increased by adjusting the insertion angle of the oxygen lance to increase the mixing degree of the gas-coal stream.

[0110] It is understandable that due to the increase in the volume of the blast furnace, the gas injection volume will increase to a certain extent. In order to avoid the erosion and wear of the side walls of the tuyere sleeve and the like caused by the increase in the air gun angle, for example, taking the insertion angle of the oxygen spray gun of the integrated injection device to be optimized as the starting point and taking the preset angle change value of 3° as an example, multiple preset angle change values ​​are reduced or increased in turn to update the insertion angle parameters of the oxygen spray gun in the working parameters.

[0111] Finally, the blowing parameters are updated according to the gas blowing amount in the basic parameters. Specifically, the preset blowing change value is obtained; and the blowing parameters are updated according to the gas blowing amount in the basic parameters and the preset blowing change value.

[0112] It is understandable that more than 2000m 3 In the actual smelting production process of the blast furnace, the adjustment of the gas injection amount depends on many factors, including the permeability of the charge, the fuel injection amount, the tuyere area and length, and the smelting conditions.

[0113] It should be noted that, under the condition that other conditions remain constant, the on-site gas injection volume is taken as the starting point and 100m 3 / min is the preset blowing change value, and the same preset blowing change value is increased and decreased symmetrically, thereby updating the blowing parameters.

[0114] In some specific embodiments, in addition to updating the structural parameters, working parameters and injection parameters, the direct blowing pipe, the tuyere sleeve, the tuyere raceway and the calculation domain part outside the raceway may also be updated.

[0115] It should be noted that the size of the raceway of different oxygen blast furnace volumes needs to be calculated based on the modified M.Hatano model.

[0116] Step S105: If the simulation result meets the optimization requirements, the comprehensive blowing device to be optimized is optimized according to the current structural parameters, working parameters and blowing parameters.

[0117] In the specific implementation of step S105, when the simulation result meets the optimization requirements, the comprehensive blowing device to be optimized is optimized according to the current structural parameters, working parameters and blowing parameters (such as shown in Table 4).

[0118]

[0119] In some specific embodiments, after the integrated blowing device to be optimized is optimized, the optimized integrated blowing device to be optimized is verified based on the current structural parameters, working parameters and blowing parameters to obtain a verification result; an optimization report is generated and output based on the verification result.

[0120] In other words, the optimal structural form, working parameters and injection parameters corresponding to the better pulverized coal combustion state and higher pulverized coal burnout rate under the above injection conditions are selected and combined to obtain the final parameter combination (as shown in Table 4) to verify the pulverized coal combustion enhancement effect.

[0121] Taking Table 4 as an example, different parameters and forms are combined to calculate the volume of 2000m 3 The verification results of the velocity field, temperature field, gas distribution field, coal powder particle burnout distribution and coal powder burnout rate are shown in Figure 2. Figures 4 to 7 shown.

[0122] It is understandable that if Figure 4 The velocity field diagram and Figure 5 From the temperature field schematic diagram shown, it can be determined that the lower part of the cyclotron zone is the area where the reaction occurs violently. The end face velocity of the tuyere sleeve can reach about 320m / s, which is beneficial to increase the kinetic energy of the air blowing into the cyclotron zone. The average temperature in the cyclotron zone can reach about 2250K, and the maximum temperature can reach about 2900K. The high-temperature concentrated distribution area is not close to the tuyere sleeve and the oxygen spray gun, which is beneficial to extend the life of the tuyere blowing device.

[0123] It should be noted that if Figure 6 The schematic diagram of the gas distribution field shows that in the lower violent reaction area, CO and H 2 The content of CO is low, while 2 and H 2 The content of O is high. Then C and CO continue to occur at high temperature 2 As the combustion reaction of the pulverized coal particles in the upper area proceeds, the porosity increases, and CO and H 2The content of CO gradually increased, while 2 and H 2 The content of O gradually decreases. 2 , H 2 and H 2 The highest molar contents of O reached 0.792, 0.653, 0.104 and 0.056, respectively.

[0124] It is understandable that if Figure 7 The distribution diagram of coal powder combustion trajectories shows that the coal powder particle combustion trajectories in the cyclotron zone are dense and intertwined, indicating that the movement and combustion reaction of the particles in this area are complex and the flow velocity is fast. The color change indicates that the degree of combustion of coal powder particles in the cyclotron zone has been effectively improved, and some unburned coal powder particles escape from the cyclotron zone with the central flow. The color changes in different areas also indicate that the fluid velocity is non-uniformly distributed in space.

[0125] It should be noted that the calculation method shown in formula (3) is used to calculate the average burnout rate of coal powder in the cyclotron zone to be about 93%. Therefore, the calculation results of the above distribution fields show that the optimized combination of spray guns has promoted the combustion enhancement effect of coal powder.

[0126]

[0127] Among them, M 0 and M are the initial mass and current mass of the coal particles, respectively, m a，0 and m a are the initial ash content and current ash content of coal particles, respectively.

[0128] In an embodiment of the present invention, a numerical simulation method is used to calculate the temperature field, velocity field and pressure field formed by oxygen, pulverized coal and main injection medium in the tuyere area of ​​blast furnaces of different volumes under the working conditions of top gas circulation oxygen blast furnace smelting. Based on these numerical simulation calculation results, the oxygen lance and pulverized coal lance in the oxygen blast furnace process are provided with the determination ideas and parameter designs about the relative position, lance diameter, insertion depth, insertion angle and injection amount between them. This method not only strengthens the combustion of pulverized coal, but also provides an effective improvement method for improving the output and energy utilization efficiency of the blast furnace and optimizing the operating conditions of the blast furnace. In addition, by controlling the mixing uniformity of oxygen and pulverized coal, it is ensured that the pulverized coal can be fully burned, the relative position relationship of the oxygen-coal lance is optimized, and the interaction conflict between the injection devices is avoided, thereby reducing the investment cost and maintenance difficulty. These improvements help to achieve efficiency improvement and cost reduction in the blast furnace smelting process, while ensuring the stability and reliability of the process.

[0129] Corresponding to the optimization method of the comprehensive blowing device based on oxygen blast furnace provided by the above embodiment of the present invention, see Figure 8 , shows a structural block diagram of an optimization device for a comprehensive blowing device based on an oxygen blast furnace provided by an embodiment of the present invention. The optimization device includes: an acquisition unit 801, a construction unit 802, a simulation unit 803, an update unit 804 and an optimization unit 805.

[0130] The acquisition unit 801 is used to acquire basic parameters of the comprehensive blowing device to be optimized and multiple preset working condition test parameters; the multiple preset working condition test parameters include structural form parameters, working parameters and blowing parameters.

[0131] The construction unit 802 is used to construct a three-dimensional simulation model based on the simulation engineering software and basic parameters.

[0132] The simulation unit 803 is used to perform a blowing simulation on the three-dimensional simulation model according to the structural form parameters, working parameters and blowing parameters to obtain a simulation result.

[0133] The updating unit 804 is used to update the structural parameters, working parameters and injection parameters if the simulation result does not meet the optimization requirements, and return to the simulation execution unit.

[0134] The optimization unit 805 is used to optimize the comprehensive blowing device to be optimized according to the current structural parameters, working parameters and blowing parameters if the simulation results meet the optimization requirements.

[0135] In the embodiments of the present invention, the design ideas and parameters of the relative positions between the gas-coal guns, the diameter of the spray gun, the insertion depth, the insertion angle, and the injection volume are elaborated in detail. The core goal is to keep the high-temperature combustion area as far away as possible from the vulnerable parts of the tuyere sleeve and the spray gun, while maximizing the burnout efficiency of the pulverized coal, and providing a solid technical foundation for the oxygen and pulverized coal injection of the oxygen blast furnace. The optimized spray gun device can enhance the mixing between oxygen and pulverized coal, thereby improving the primary burnout rate of pulverized coal, reducing incompletely burned pulverized coal, and improving thermal efficiency and fuel utilization. As the burnout rate of pulverized coal increases, fuel consumption is reduced, thereby reducing production costs. In addition, this method can also reduce energy waste, achieve energy conservation and emission reduction, reduce the emission of smoke and harmful gases, and have a smaller negative impact on the environment.

[0136] Combination Figure 8 As shown in the figure, the optimization device also includes: a verification unit and an output unit.

[0137] The verification unit is used to verify the optimized comprehensive blowing device to be optimized based on the current structural form parameters, working parameters and blowing parameters to obtain a verification result.

[0138] The output unit is used to generate and output an optimization report based on the verification results.

[0139] Combination Figure 8 The content shown, the update unit, includes: a first update module, a second update module and a third update module.

[0140] The first updating module is used to update the structural form parameters according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters.

[0141] The first updating module is specifically used to: set the position parameter of the oxygen lance in the structural form parameter to the upper part of the position parameter of the coal injection gun in the basic parameter, and set the outlet position of the oxygen lance in the structural form parameter to the outlet position of the oxygen lance of the integrated injection device to be optimized.

[0142] Alternatively, the position parameter of the oxygen lance in the structural form parameters is set to the lower part of the position parameter of the coal lance in the basic parameters, and the outlet position of the oxygen lance in the structural form parameters is set to be flush with the outlet position of the coal lance in the basic parameters.

[0143] Alternatively, the position parameter of the oxygen lance in the structural form parameters is set to the front of the position parameter of the coal injection gun in the basic parameters; the outlet position of the oxygen lance in the structural form parameters is determined according to the outlet position of the oxygen lance of the comprehensive injection device to be optimized and the outlet position of the coal injection gun in the basic parameters.

[0144] The second updating module is used to update the working parameters based on the radius parameters of the oxygen lance and the volume parameters of the oxygen blast furnace in the basic parameters.

[0145] The third updating module is used to update the injection parameters according to the gas injection amount in the basic parameters.

[0146] The third updating module is specifically used to: obtain a preset blowing change value; and update the blowing parameters according to the gas blowing amount in the basic parameters and the preset blowing change value.

[0147] Combination Figure 8 As shown in the content, the second update module includes: a first calculation submodule, a second calculation submodule, a third calculation submodule, a first update submodule and a second update submodule.

[0148] The first calculation submodule is used to calculate the target oxygen spray gun radius according to the pressure difference between the oxygen blast furnace and the outside, the blowing gas density and the blowing gas flow rate of the oxygen spray gun in the basic parameters.

[0149] The second calculation submodule is used to calculate the difference between the target oxygen spray gun radius and the radius parameter of the oxygen spray gun in the basic parameters, and update the radius parameter of the oxygen spray gun in the working parameters according to the difference.

[0150] The third calculation submodule is used to calculate the insertion depth change according to the oxygen blast furnace volume parameter in the basic parameters.

[0151] The first updating submodule is used to update the insertion depth parameter of the oxygen spray gun in the working parameters according to the insertion depth change.

[0152] The second updating submodule is used to update the insertion angle parameter of the oxygen spray gun in the working parameters according to the insertion angle parameter of the oxygen spray gun in the basic parameters and the preset angle change value.

[0153] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0154] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0155] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optimization method for a comprehensive blowing device based on an oxygen blast furnace, characterized in that: The method comprises: Obtaining basic parameters of the comprehensive blowing device to be optimized and a plurality of preset working condition test parameters; the plurality of preset working condition test parameters include structural form parameters, working parameters and blowing parameters; Constructing a three-dimensional simulation model based on the simulation engineering software and the basic parameters; According to the structural form parameters, the working parameters and the blowing parameters, the three-dimensional simulation model is subjected to blowing simulation to obtain a simulation result; If the simulation result does not meet the optimization requirement, the structural form parameters, the working parameters and the blowing parameters are updated, and the process returns to the step of performing blowing simulation on the three-dimensional simulation model according to the structural form parameters, the working parameters and the blowing parameters to obtain the simulation result; If the simulation result meets the optimization requirements, the comprehensive blowing device to be optimized is optimized according to the current structural parameters, working parameters and blowing parameters.

2. The method according to claim 1, characterized in that If the simulation result meets the optimization requirements, after optimizing the comprehensive blowing device to be optimized according to the current structural parameters, working parameters and blowing parameters, the method further includes: Verifying the optimized comprehensive blowing device to be optimized based on the current structural parameters, working parameters and blowing parameters to obtain a verification result; An optimization report is generated and outputted according to the verification results.

3. The method according to claim 1, characterized in that The updating of the structural parameters, the operating parameters and the blowing parameters comprises: According to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters, the structural form parameters are updated; The working parameters are updated based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters; The blowing parameters are updated according to the gas blowing amount in the basic parameters.

4. The method according to claim 3, characterized in that The updating of the structural form parameters according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters includes: The position parameter of the oxygen lance in the structural form parameter is set to the upper part of the position parameter of the coal injection lance in the basic parameter, and the outlet position of the oxygen lance in the structural form parameter is set to the outlet position of the oxygen lance of the comprehensive injection device to be optimized; or; The position parameter of the oxygen lance in the structural form parameter is set to the lower part of the position parameter of the coal lance in the basic parameter, and the outlet position of the oxygen lance in the structural form parameter is set to be flush with the outlet position of the coal lance in the basic parameter; or; The position parameter of the oxygen lance in the structural form parameter is set to the front of the position parameter of the coal injection lance in the basic parameter; The outlet position of the oxygen lance in the structural form parameters is determined according to the outlet position of the oxygen lance of the integrated injection device to be optimized and the outlet position of the coal injection lance in the basic parameters.

5. The method according to claim 3, characterized in that: The updating of the working parameters based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters includes: Calculate the target oxygen lance radius according to the pressure difference between the oxygen blast furnace and the outside, the injection gas density and the injection gas flow rate of the oxygen lance in the basic parameters; Calculating the difference between the target oxygen spray gun radius and the radius parameter of the oxygen spray gun in the basic parameters, and updating the radius parameter of the oxygen spray gun in the working parameters according to the difference; Calculate the insertion depth variation according to the oxygen blast furnace volume parameter in the basic parameters; updating the insertion depth parameter of the oxygen spray gun in the working parameters according to the insertion depth variation; The insertion angle parameter of the oxygen spray gun in the working parameters is updated according to the insertion angle parameter of the oxygen spray gun in the basic parameters and the preset angle change value.

6. The method according to claim 3, characterized in that The updating of the blowing parameters according to the gas blowing amount in the basic parameters includes: Get the preset blowing change value; The blowing parameters are updated according to the gas blowing amount in the basic parameters and the preset blowing change value.

7. An optimization device for a comprehensive blowing device based on an oxygen blast furnace, characterized in that: The device comprises: An acquisition unit, used to acquire basic parameters of the comprehensive blowing device to be optimized and a plurality of preset working condition test parameters; the plurality of preset working condition test parameters include structural form parameters, working parameters and blowing parameters; A construction unit, used for constructing a three-dimensional simulation model based on the simulation engineering software and the basic parameters; A simulation unit, used for performing a blowing simulation on the three-dimensional simulation model according to the structural form parameters, the working parameters and the blowing parameters to obtain a simulation result; An updating unit, for updating the structural parameters, the operating parameters and the blowing parameters if the simulation result does not meet the optimization requirements, and returning to the simulation execution unit; The optimization unit is used to optimize the comprehensive blowing device to be optimized according to the current structural parameters, working parameters and blowing parameters if the simulation result meets the optimization requirements.

8. The device according to claim 7, characterized in that The device also includes: A verification unit, used for verifying the optimized comprehensive blowing device to be optimized based on current structural parameters, working parameters and blowing parameters, and obtaining a verification result; The output unit is used to generate and output an optimization report based on the verification result.

9. The device according to claim 7, characterized in that The updating unit comprises: A first updating module is used to update the structural form parameters according to the position parameters of the coal injection gun and the position parameters of the direct blowing pipe in the basic parameters; A second updating module, used for updating the working parameters based on the radius parameter of the oxygen lance and the volume parameter of the oxygen blast furnace in the basic parameters; The third updating module is used to update the blowing parameters according to the gas blowing amount in the basic parameters.

10. The device according to claim 9, characterized in that The first update module is specifically used for: The position parameter of the oxygen lance in the structural form parameter is set to the upper part of the position parameter of the coal injection lance in the basic parameter, and the outlet position of the oxygen lance in the structural form parameter is set to the outlet position of the oxygen lance of the comprehensive injection device to be optimized; or; The position parameter of the oxygen lance in the structural form parameter is set to the lower part of the position parameter of the coal lance in the basic parameter, and the outlet position of the oxygen lance in the structural form parameter is set to be flush with the outlet position of the coal lance in the basic parameter; or; The position parameter of the oxygen lance in the structural form parameter is set to the front of the position parameter of the coal injection lance in the basic parameter; The outlet position of the oxygen lance in the structural form parameters is determined according to the outlet position of the oxygen lance of the integrated injection device to be optimized and the outlet position of the coal injection lance in the basic parameters.

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