A method and device for calculating excess oxygen coefficient of sintering furnace

Abstract

The present application provides a method and device for calculating the oxygen excess coefficient of a sintering furnace, wherein the method includes: obtaining the attribute information of each wind box of the sintering furnace, the operating parameters of the sintering furnace, and the sintering flue gas parameters of each wind box; calculating the required oxygen amount for fuel combustion in each wind box and the actual oxygen amount supplied for fuel combustion in each wind box through a first calculation model and a second calculation model according to the attribute information, the operating parameters, and the sintering flue gas parameters; calculating the oxygen excess coefficient of each wind box according to the required oxygen amount and the actual oxygen amount. The present application solves the problem that the oxygen excess coefficient of different sintering stages cannot be detected and calculated. The solution proposed in the present application can intuitively and quantitatively measure the oxygen surplus degree of the fuel combustion process through the calculated oxygen excess coefficient, thereby ensuring the smooth progress of sintering production and improving the quality of sintered ore.

Description

Technical Field

[0001] The present application relates to the technical field of iron ore sintering, and in particular to a method and device for calculating an excess oxygen coefficient of a sintering furnace. Background Art

[0002] Oxygen is one of the important elements involved in the sintering process and is an essential chemical component for fuel combustion in the sintering material layer. The amount of oxygen involved in fuel combustion directly determines the combustion efficiency and quality, which in turn affects the amount of liquid phase generated during the sintering process, and thus affects the quality and indicators of sintered ore. The "oxygen excess coefficient", that is, the ratio of the actual amount of oxygen supplied by fuel combustion to the amount of oxygen required for fuel combustion, can be used to intuitively and quantitatively measure the excess of oxygen in the fuel combustion process.

[0003] As the permeability of the material layer changes during the sintering process, the oxygen excess coefficient of fuel combustion at different positions in the sintering machine's running direction is different. At present, there is no effective and accurate method to detect and calculate the oxygen excess coefficient at different sintering stages, which restricts the further optimization of sintering process parameters.

[0004] Based on this, how to use an effective calculation method to obtain the oxygen excess coefficient of each wind box of the sintering furnace, and intuitively and quantitatively measure the oxygen abundance of the fuel combustion process according to the oxygen excess coefficient, to ensure the smooth progress of sintering production and improve the quality of sintered ore, is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present application is to provide a method and device for calculating the excess oxygen coefficient of a sintering furnace. The present application solves the problem that the excess oxygen coefficients of different sintering stages cannot be detected and calculated. The scheme proposed in the present application can intuitively and quantitatively measure the excess oxygen degree of the fuel combustion process through the calculated excess oxygen coefficient, thereby ensuring the smooth progress of sintering production and improving the quality of sintered ore.

[0006] Specifically, this application adopts the following technical solutions:

[0007] According to one aspect of an embodiment of the present application, a method for calculating the excess oxygen coefficient of a sintering furnace is provided, characterized in that the method includes: obtaining attribute information of each wind box of the sintering furnace, operating parameters of the sintering furnace, and sintering flue gas parameters of each wind box; calculating the required amount of oxygen for fuel combustion in each wind box through a first calculation model based on the attribute information, the operating parameters, and the sintering flue gas parameters; calculating the actual amount of oxygen supplied for fuel combustion in each wind box through a second calculation model based on the attribute information, the operating parameters, and the sintering flue gas parameters; and calculating the excess oxygen coefficient of each wind box based on the required oxygen amount and the actual oxygen amount.

[0008] In some embodiments of the present application, based on the above solution, the first calculation model includes:

[0009]

[0010] Among them, OC i is the amount of oxygen required for fuel combustion in the i-th wind box, j is the number of wind boxes occupied by the igniter, n is the number of wind boxes in the sintering furnace, gSF i is the amount of fuel consumed by the ith wind box, and Csf is the fixed carbon content of the fuel.

[0011] In some embodiments of the present application, based on the above scheme, the gSF i The calculation formula is:

[0012]

[0013] Among them, gSF i is the amount of fuel consumed by the i-th bellows, Q i is the hourly sintering flue gas flow rate of the i-th wind box, T i is the temperature of the sintering flue gas of the i-th wind box, P a is the local atmospheric pressure, P i is the sintering flue gas pressure of the i-th wind box, CO i is the CO concentration of the sintering flue gas from the i-th windbox, is the CO2 concentration of the sintering flue gas of the i-th wind box, gCO2sf is the total amount of CO2 generated by the fuel combustion of the i-th wind box, and gCO2T is the total amount of CO2 in the sintering flue gas of the i-th wind box.

[0014] In some embodiments of the present application, based on the above scheme, the calculation formula of gCO2sf is:

[0015]

[0016] Among them, w is the hourly feeding amount of the sintering furnace, Rsf is the fuel ratio in the mixture, Msf is the water content of the fuel, gSt is the hourly output of the raw sintered ore, and Cst is the residual carbon content of the sintered ore.

[0017] In some embodiments of the present application, based on the above scheme, the calculation formula of gCO2T is:

[0018]

[0019] In some embodiments of the present application, based on the above solution, the second calculation model includes:

[0020]

[0021] Among them, OAi is the actual amount of oxygen supplied by the fuel combustion in the ith windbox, OSF i is the amount of oxygen consumed by fuel combustion and reduced iron oxidation in the i-th bellows, is the hourly production of O2 of the ith bellows, gO2L i is the amount of O2 brought in by the leakage of the i-th bellows.

[0022] In some embodiments of the present application, based on the above scheme, the OSF i The calculation formula is:

[0023]

[0024] In some embodiments of the present application, based on the above scheme, the and gO2L i The calculation formula is:

[0025]

[0026]

[0027] in, is the O2 concentration of the sintering flue gas of the i-th wind box, δ i is the air leakage rate of the i-th bellows.

[0028] In some embodiments of the present application, based on the above scheme, the oxygen excess coefficient of each wind box is calculated according to the required oxygen amount and the actual oxygen amount, and the calculation formula of the oxygen excess coefficient is:

[0029]

[0030] Among them, Oe i is the oxygen excess coefficient of fuel combustion in the i-th wind box.

[0031] According to one aspect of an embodiment of the present application, a calculation device for calculating the excess oxygen coefficient of a sintering furnace is provided, and the device includes: an acquisition unit, which is used to acquire the attribute information of each wind box of the sintering furnace, the operating parameters of the sintering furnace, and the sintering flue gas parameters of each wind box; a first calculation unit, which is used to calculate the required oxygen amount for fuel combustion in each wind box through a first calculation model based on the attribute information, the operating parameters, and the sintering flue gas parameters; a second calculation unit, which is used to calculate the actual oxygen amount supplied for fuel combustion in each wind box through a second calculation model based on the attribute information, the operating parameters, and the sintering flue gas parameters; and a third calculation unit, which is used to calculate the excess oxygen coefficient of each wind box based on the required oxygen amount and the actual oxygen amount.

[0032] It can be seen from the above technical solution that the present application has at least the following advantages and positive effects:

[0033] The solution proposed in this application can solve the problem of being unable to detect and calculate the oxygen excess coefficient in different sintering stages. The solution proposed in this application can intuitively and quantitatively measure the excess oxygen in the fuel combustion process through the calculated oxygen excess coefficient, thereby ensuring the smooth progress of sintering production and improving the quality of sintered ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A flow chart showing the calculation of the excess oxygen coefficient of a sintering furnace in one embodiment of the present application is shown;

[0036] Figure 2 A structural block diagram of a device for calculating the excess oxygen coefficient of a sintering furnace in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0038] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0039] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0041] In this application, the sintering process is first briefly described. With the rapid development of the steel industry, the output and quality of natural rich ores with metal fillers are far from meeting the requirements of blast furnace smelting, and the concentrate powder obtained after beneficiation of a large number of lean ores cannot be directly put into the furnace for smelting. These powder ores can only be sintered into blocks for use in blast furnaces. Sintering is to mix iron-containing raw materials, fuels, solvents, etc. in proportion, mix and granulate them, wet them with water, and spread them on sintering equipment, ignite and sinter from top to bottom. At the same time as ignition, the sintering furnace starts to ventilate. While the fuel in the mixed ore is burning from top to bottom, the fusible substances are melted and moistened with infusible substances. The liquid phase gradually cools and sticks the infusible substances together. The block object obtained through this process is called sintered ore.

[0042] During the sintering process, oxygen is one of the important elements involved in sintering and is an indispensable chemical component for fuel combustion in the sintering material layer. The amount of oxygen involved in fuel combustion directly determines the combustion efficiency and quality, which in turn affects the amount of liquid phase generated during the sintering process, and further affects the quality and indicators of the sintered ore. At present, there is no effective and accurate method to detect and calculate the oxygen excess coefficient in different sintering stages, and it is impossible to intuitively and quantitatively measure the excess degree of oxygen in the fuel combustion process, which restricts the further optimization of the sintering process parameters. The present application proposes a method and device for calculating the oxygen excess coefficient of a sintering furnace, which can solve the above problems, ensure the quality of the sintered ore, and improve the production efficiency of the sintering furnace.

[0043] The implementation details of the technical solution of the embodiment of the present application are described in detail below:

[0044] Reference Figure 1 , Figure 1 This is a flow chart of an annealing control method for an iron-chromium-aluminum alloy bar in one embodiment of the present application.

[0045] According to a typical embodiment of the present application, a method for calculating the excess oxygen coefficient of a sintering furnace is provided, and the method includes the following steps S1 to S4:

[0046] Step S1, acquiring attribute information of each wind box of the sintering furnace, operating parameters of the sintering furnace, and sintering fume parameters of each wind box.

[0047] Step S2, calculating the necessary amount of oxygen for fuel combustion in each wind box through a first calculation model according to the attribute information, the operating parameters, and the sintering flue gas parameters.

[0048] Step S3, calculating the actual amount of oxygen supplied by the fuel combustion in each wind box through a second calculation model according to the attribute information, the operation parameters, and the sintering flue gas parameters.

[0049] Step S4, calculating the oxygen excess coefficient of each wind box according to the required oxygen amount and the actual oxygen amount.

[0050] In the present application, the sintering furnace may include a bellows and an igniter, wherein the bellows of the sintering furnace is one of the important equipment in sintering production, and plays the role of guiding ventilation of the material layer in sintering production. The exhaust gas generated in the sintering production process is sucked away by the main exhaust fan through the bellows and the large flue and discharged into the atmosphere. The control of the ventilation volume by the bellows has a direct impact on the production efficiency, output and quality of the sintering furnace; the igniter of the sintering furnace is used to supply a certain amount of heat and temperature to the sintering material surface to ensure that the sintering process automatically proceeds downward after ignition. The purpose of igniting the sintering material in the sintering furnace is to ignite the fuel in the surface sintering material and to make the surface sintered ore have a certain strength and permeability to ensure the smooth progress of the sintering production.

[0051] In the present application, the sintering furnace is segmented according to the number of its bellows, by obtaining the attribute information of each bellows of the sintering furnace, the operating parameters of the sintering furnace, and the sintering flue gas parameters of each bellows. When the sintering furnace is segmented, it is assumed that there are 27 bellows of the sintering furnace. After excluding the number of bellows occupied by the igniter of the sintering furnace (assuming that the number of bellows occupied by the igniter is 3), the sintering furnace is divided into 24 sections, and then the attribute information and the sintering flue gas parameters of each bellows of the sintering furnace excluding the bellows occupied by the igniter are obtained respectively.

[0052] In the present application, the attribute information of the bellows may include the number of the bellows, the number of bellows occupied by the ignition machine, and the air leakage rate of each bellows. Since the bellows of the sintering furnace are welded to each other, weld leakage may occur, so it is necessary to obtain the air leakage rate of each bellows. The air leakage rate of the sintering furnace body segment corresponding to each bellows can be measured according to the sintering air leakage rate test standard YB / T 4784.1-2019.

[0053] In the present application, after obtaining the attribute information of each bellows of the sintering furnace, the operating parameters of the sintering furnace, and the sintering flue gas parameters of each bellows, the required oxygen amount for fuel combustion in each bellows can be calculated according to the attribute information, the operating parameters, the sintering flue gas parameters, and through a first calculation model. The actual oxygen amount supplied for fuel combustion in each bellows can also be calculated according to the attribute information, the operating parameters, the sintering flue gas parameters, and through a second calculation model. The oxygen excess coefficient of each bellows is calculated according to the required oxygen amount and the actual oxygen amount. The ratio of the actual oxygen amount to the required oxygen amount is the oxygen excess coefficient. After obtaining the oxygen excess coefficient, the oxygen excess coefficient can be used to intuitively and quantitatively measure the oxygen abundance in the fuel combustion process to ensure the smooth progress of sintering production.

[0054] In one embodiment of the present application, the first calculation model includes:

[0055]

[0056] Among them, OC i is the amount of oxygen required for fuel combustion in the i-th wind box, j is the number of wind boxes occupied by the igniter, n is the number of wind boxes in the sintering furnace, gSF i is the amount of fuel consumed by the ith wind box, and Csf is the fixed carbon content of the fuel.

[0057] In the present application, after obtaining the attribute information of each wind box of the sintering furnace, the operating parameters of the sintering furnace, and the sintering flue gas parameters of each wind box, the necessary oxygen amount for fuel combustion in each wind box can be calculated by the above-mentioned first calculation model. In the above-mentioned first calculation model, j is the number of wind boxes occupied by the igniter, i is the i-th wind box (the i-th wind box is taken as an example in the formula of the present application), n is the number of wind boxes of the sintering furnace, and gSF i is the amount of fuel consumed by the i-th wind box (the amount of fuel consumed when the sintered ore is sintered in the i-th wind box), and Csf is the fixed carbon content of the fuel (when sintering, a certain amount of fuel is required, and the fuel used has a certain carbon content).

[0058] In one embodiment of the present application, the gSF i The calculation formula is:

[0059]

[0060] Among them, gSF i is the amount of fuel consumed by the i-th bellows, Q i is the hourly sintering flue gas flow rate of the i-th wind box, T i is the temperature of the sintering flue gas of the i-th wind box, P ais the local atmospheric pressure, P i is the sintering flue gas pressure of the i-th wind box, CO i is the CO concentration of the sintering flue gas from the i-th windbox, is the CO2 concentration of the sintering flue gas of the i-th wind box, gCO2sf is the total amount of CO2 generated by the fuel combustion of the i-th wind box, and gCO2T is the total amount of CO2 in the sintering flue gas of the i-th wind box.

[0061] In the present application, the gCO2sf in the first calculation model is the total amount of CO2 generated by the combustion of fuel in the ith wind box, and the gCO2sf needs to be calculated. Among them, it is necessary to obtain the sintering flue gas parameters of each wind box, which may include the hourly sintering flue gas flow rate of the ith wind box, the temperature of the sintering flue gas of the ith wind box, the air pressure of the sintering flue gas of the ith wind box, the CO concentration of the sintering flue gas of the ith wind box, which is the CO2 concentration of the sintering flue gas of the ith wind box, and it is also necessary to obtain the local atmospheric pressure, the total amount of CO2 generated by the combustion of fuel in the ith wind box, which is the total amount of CO2 in the sintering flue gas of the ith wind box. Then according to the above gSF i The calculation formula is used to calculate the amount of fuel consumed by the i-th bellows.

[0062] In one embodiment of the present application, the calculation formula of gCO2sf is:

[0063]

[0064] Among them, w is the hourly feeding amount of the sintering furnace, Rsf is the fuel ratio in the mixture, Msf is the water content of the fuel, gSt is the hourly output of the raw sintered ore, and Cst is the residual carbon content of the sintered ore.

[0065] In this application, when calculating the fuel consumption gSF of the i-th wind box, i It is also necessary to calculate the total amount of CO2 generated by the combustion of the fuel in the ith wind box, wherein the operating parameters of the sintering furnace need to be obtained, and the operating parameters may include the hourly feeding amount of the sintering furnace, the fuel ratio in the mixture, the water content of the fuel, the hourly output of the raw sintered ore, the residual carbon content of the sintered ore and other parameters, and then calculate the total amount of CO2 gCO2sf generated by the combustion of the fuel in the ith wind box to obtain the total amount of CO2 gCO2sf generated by the combustion of the fuel in the ith wind box.

[0066] In one embodiment of the present application, the calculation formula of gCO2T is:

[0067]

[0068] In this application, when calculating the fuel consumption gSF of the i-th wind box, iIn the process, it is also necessary to calculate the total amount of CO2 gCO2T in the sintering flue gas of the i-th bellows, wherein the hourly sintering flue gas flow rate of the i-th bellows, the temperature of the sintering flue gas of the i-th bellows, the air pressure of the sintering flue gas of the i-th bellows, the CO concentration of the sintering flue gas of the i-th bellows, and the CO2 concentration of the sintering flue gas of the i-th bellows can be obtained, and then the total amount of CO2 in the sintering flue gas of the i-th bellows can be calculated by the calculation formula of the total amount of CO2 gCO2T in the sintering flue gas of the i-th bellows.

[0069] In one embodiment of the present application, the second computing model includes:

[0070]

[0071] Among them, OA i is the actual amount of oxygen supplied by the fuel combustion in the ith windbox, OSF i is the amount of oxygen consumed by fuel combustion and reduced iron oxidation in the i-th bellows, is the hourly production of O2 of the ith bellows, gO2L i is the amount of O2 brought in by the leakage of the i-th bellows.

[0072] In this application, it is necessary to obtain the oxygen excess coefficient of each wind box, and it is also necessary to calculate the actual amount of oxygen supplied by the fuel combustion in each wind box. Taking the ith wind box as an example, when calculating the actual amount of oxygen supplied by the fuel combustion in the ith wind box, it is necessary to obtain the amount of oxygen consumed by the fuel combustion and the oxidation of reduced iron in the ith wind box. 2 The hourly production is the O brought in by the leakage of the i-th bellows. 2 The actual amount of oxygen supplied by the combustion of fuel in the i-th wind box is calculated according to the second calculation model.

[0073] In one embodiment of the present application, the OSF i The calculation formula is:

[0074]

[0075] In the present application, when calculating the actual amount of oxygen supplied by the combustion of the fuel in the i-th wind box according to the second calculation model, it is also necessary to calculate the amount of oxygen OSF consumed by the combustion of the fuel and the oxidation of the reduced iron in the i-th wind box. i , where the hourly sintering flue gas flow rate of the i-th bellows, the temperature of the sintering flue gas of the i-th bellows, the pressure of the sintering flue gas of the i-th bellows, the CO concentration of the sintering flue gas of the i-th bellows, and the CO 2 concentration, and through the above OSF iThe calculation formula is used to calculate the oxygen consumption OSF for fuel combustion and reduced iron oxidation in the i-th wind box. i .

[0076] In one embodiment of the present application, the and gO2L i The calculation formula is:

[0077]

[0078]

[0079] in, is the O2 concentration of the sintering flue gas of the i-th wind box, δ i is the air leakage rate of the i-th bellows.

[0080] In the present application, when calculating the actual amount of oxygen supplied by the combustion of the fuel in the i-th wind box according to the second calculation model, it is also necessary to calculate the O2 hourly production of the i-th wind box. The amount of O2 introduced by the leakage of the i-th bellows gO2L i It is necessary to first obtain the hourly sintering flue gas flow rate of the i-th bellows, the temperature of the sintering flue gas of the i-th bellows, the air pressure of the sintering flue gas of the i-th bellows, the CO concentration of the sintering flue gas of the i-th bellows, the CO2 concentration of the sintering flue gas of the i-th bellows, and the air leakage rate of the i-th bellows. The O2 hourly production of the i-th bellows can be calculated based on the and the amount of O2 introduced by the leakage of the i-th bellows gO2L i The calculation formula is used to calculate the O2 hourly production of the i-th bellows and the amount of O2 introduced by the leakage of the i-th bellows gO2L i .

[0081] In one embodiment of the present application, the oxygen excess coefficient of each wind box is calculated according to the required oxygen amount and the actual oxygen amount, and the calculation formula of the oxygen excess coefficient is:

[0082]

[0083] Among them, Oe i is the oxygen excess coefficient of fuel combustion in the i-th wind box.

[0084] In the present application, after calculating the required oxygen amount and the actual oxygen amount of the i-th bellows, the oxygen excess coefficient of the i-th bellows is calculated according to the required oxygen amount and the actual oxygen amount according to the above-mentioned oxygen excess coefficient calculation formula, and then the combustion state of the fuel in the i-th bellows can be intuitively and accurately understood based on the oxygen excess coefficient, and the excess degree of oxygen in the fuel combustion process can be quantitatively measured to ensure the smooth progress of sintering production.

[0085] In the present application, the above calculations are all based on the i-th bellows as an example. In actual production, the values ​​of various parameters can be taken and calculated according to the actual conditions of the bellows of the sintering furnace, and the present application does not impose any special restrictions on this.

[0086] The specific implementation manner of the present application is further illustrated below through specific examples, but the specific implementation manner of the present application is not limited to the following examples.

[0087] In a specific embodiment of the present application, the sintering furnace to be tested has a specification of 500m 2 There are 27 wind boxes in total, and the wind boxes where the igniter is located are the first to third wind boxes (the igniter occupies the first three wind boxes, and the wind boxes under test are divided into the first section starting from the fourth wind box). The hourly feeding capacity of the sintering furnace under test is 1050t / h, the fuel ratio in the mixture is 3.5%, the fuel moisture is 9.0%, the fuel fixed carbon content is 80%, the hourly output of the raw sintered ore is 900t / h, and the residual carbon content of the sintered ore is 0.015%. The sintering flue gas parameters of each wind box and the air leakage rate detection data of each wind box are shown in Table 1 below.

[0088]

[0089]

[0090] According to the calculation formula of sintering stage oxygen excess coefficient, the sintering oxygen excess coefficient in different stages is calculated, as shown in Table 2 below.

[0091]

[0092] In this embodiment, after calculating the oxygen excess coefficient of each wind box of the sintering furnace under test, the oxygen surplus degree of the fuel combustion process can be intuitively and quantitatively measured according to the oxygen excess coefficient of each wind box, and the oxygen surplus degree of the fuel combustion process can be adjusted in time to ensure the smooth progress of sintering production and improve the quality of sintered ore.

[0093] The following describes an apparatus embodiment of the present application, which can be used to execute the method for calculating the excess oxygen coefficient of a sintering furnace in the above-mentioned embodiment of the present application. For details not disclosed in the apparatus embodiment of the present application, please refer to the embodiment of the method for calculating the excess oxygen coefficient of a sintering furnace in the above-mentioned embodiment of the present application.

[0094] Figure 2 It is a structural block diagram of a device for calculating the excess oxygen coefficient of a sintering furnace according to an embodiment of the present application.

[0095] Reference Figure 2As shown, according to an embodiment of the present application, a device for calculating the excess oxygen coefficient of a sintering furnace comprises: an acquisition unit 201 , a first calculation unit 202 , a second calculation unit 203 , and a third calculation unit 204 .

[0096] The acquisition unit 201 is used to acquire the property information of each wind box of the sintering furnace, the operation parameters of the sintering furnace, and the sintering flue gas parameters of each wind box.

[0097] The first calculation unit 202 is used to calculate the necessary oxygen amount for fuel combustion in each wind box according to the attribute information, the operation parameters, and the sintering flue gas parameters through a first calculation model.

[0098] The second calculation unit 203 is used to calculate the actual amount of oxygen supplied by the fuel combustion in each wind box through a second calculation model according to the attribute information, the operation parameters, and the sintering flue gas parameters.

[0099] The third calculation unit 204 is used to calculate the oxygen excess coefficient of each wind box according to the required oxygen amount and the actual oxygen amount.

[0100] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0101] It can be seen from the above technical solution that the present application has at least the following advantages and positive effects:

[0102] Firstly, the solution proposed in this application can solve the problem that the oxygen excess coefficient in different sintering stages cannot be detected and calculated. The calculated oxygen excess coefficient can be used to intuitively and quantitatively measure the oxygen abundance in the fuel combustion process, thereby ensuring the smooth progress of sintering production and improving the quality of sintered ore.

[0103] Secondly, the solution proposed in this application can intuitively and accurately reflect the combustion state of the fuel in the sintering material layer, and has the advantages of strong operability, simple test process, and accurate results.

[0104] Thirdly, the scheme proposed in this application can adapt to different sintering production process conditions and has extremely high promotion and application value and good development prospects.

[0105] Although the present application has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the application, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A method for calculating the excess oxygen coefficient of a sintering furnace, characterized in that: The method comprises: Acquire the property information of each wind box of the sintering furnace, the operation parameters of the sintering furnace, and the sintering fume parameters of each wind box; According to the attribute information, the operation parameters, and the sintering flue gas parameters, the necessary oxygen amount for fuel combustion in each wind box is calculated by a first calculation model; According to the attribute information, the operation parameters, and the sintering flue gas parameters, the actual amount of oxygen supplied by the fuel combustion in each wind box is calculated by a second calculation model; Calculating the oxygen excess coefficient of each wind box according to the required oxygen amount and the actual oxygen amount; The first calculation model includes: Among them, OC i is the amount of oxygen required for fuel combustion in the i-th wind box, j is the number of wind boxes occupied by the igniter, n is the number of wind boxes in the sintering furnace, gSF i is the amount of fuel consumed by the ith wind box, and Csf is the fixed carbon content of the fuel.

2. The method according to claim 1, characterized in that The gSF i The calculation formula is: Among them, gSF i is the amount of fuel consumed by the i-th bellows, Q i is the hourly sintering flue gas flow rate of the i-th wind box, T i is the temperature of the sintering flue gas of the i-th wind box, P a is the local atmospheric pressure, P i is the sintering flue gas pressure of the i-th wind box, CO i is the CO concentration of the sintering flue gas from the i-th bellows, is the CO2 concentration of the sintering flue gas of the i-th wind box, gCO2sf is the total amount of CO2 generated by the fuel combustion of the i-th wind box, and gCO2T is the total amount of CO2 in the sintering flue gas of the i-th wind box.

3. The method according to claim 2, characterized in that The calculation formula of gCO2sf is: Among them, w is the hourly feeding amount of the sintering furnace, Rsf is the fuel ratio in the mixture, Msf is the water content of the fuel, gSt is the hourly output of the raw sintered ore, and Cst is the residual carbon content of the sintered ore.

4. The method according to claim 3, characterized in that: The calculation formula of gCO2T is:

5. The method according to claim 4, characterized in that The second calculation model comprises: Among them, OA i is the actual amount of oxygen supplied by the fuel combustion in the ith windbox, OSF i is the amount of oxygen consumed by fuel combustion and reduced iron oxidation in the i-th bellows, is the hourly production of O2 of the ith bellows, gO2L i is the amount of O2 brought in by the leakage of the i-th bellows.

6. The method according to claim 5, characterized in that The OSF i The calculation formula is:

7. The method according to claim 6, characterized in that Said and gO2L i The calculation formula is: in, is the O2 concentration of the sintering flue gas of the i-th wind box, δ i is the air leakage rate of the i-th bellows.

8. The method according to claim 7, characterized in that The oxygen excess coefficient of each wind box is calculated according to the required oxygen amount and the actual oxygen amount, and the calculation formula of the oxygen excess coefficient is: Among them, Oe i is the oxygen excess coefficient of fuel combustion in the i-th wind box.

9. A device for calculating the excess oxygen coefficient of a sintering furnace, characterized in that: The device comprises: An acquisition unit is used to acquire attribute information of each wind box of the sintering furnace, operating parameters of the sintering furnace, and sintering fume parameters of each wind box; A first calculation unit is used to calculate the amount of oxygen required for fuel combustion in each wind box through a first calculation model according to the attribute information, the operation parameters, and the sintering flue gas parameters; The first calculation model includes: Among them, OC i is the amount of oxygen required for fuel combustion in the i-th wind box, j is the number of wind boxes occupied by the igniter, n is the number of wind boxes in the sintering furnace, gSF i is the amount of fuel consumed by the ith windbox, Csf is the fixed carbon content of the fuel; A second calculation unit is used to calculate the actual amount of oxygen supplied by the fuel combustion in each wind box through a second calculation model according to the attribute information, the operation parameters, and the sintering flue gas parameters; The third calculation unit is used to calculate the oxygen excess coefficient of each wind box according to the required oxygen amount and the actual oxygen amount.

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