CN112226563A - Method and system for source management and control of sulfur dioxide emission in flue gas of iron-making hot blast furnace - Google Patents

Abstract

The invention belongs to the technical field of energy saving and emission reduction of metallurgical steel, and proposes a source control method and system for the emission of sulfur dioxide in flue gas from an ironmaking hot blast furnace, aiming to solve the problem of source sulfur element control in a blast furnace ironmaking process, so as to realize the sulfur dioxide emission in hot blast furnace flue gas. The goal of meeting the emission standards at all times. The system includes a data acquisition and transmission module, a memory, an analysis and calculation module, a data monitoring module, and a management and control terminal. The input end of the data acquisition and transmission module is respectively connected with the data monitoring module and the measurement system and component detection system of the blast furnace body. The output ends are respectively connected with the analysis and calculation module and the management and control terminal; the data acquisition and transmission module and the memory, and the analysis and calculation module and the management and control terminal are respectively connected interactively. The invention controls the origin from the blast furnace raw material and the operation source, and has the characteristics of few control actions, short time, compact rhythm and high production efficiency.

Description

Method and system for source management and control of sulfur dioxide emission in flue gas of iron-making hot blast furnace

technical field

The invention belongs to the technical field of energy saving and emission reduction of metallurgical iron and steel, and in particular relates to a method and a system for controlling the source of sulfur dioxide emission in flue gas of an ironmaking hot blast furnace.

Background technique

The main link of pollutant SO ₂ emission in blast furnace ironmaking unit is in the hot blast furnace. When the blast furnace gas or mixed gas containing sulfides such as H ₂ S is heated and burned, SO ₂ will be emitted from the flue gas generated. The sulfide in the blast furnace gas comes from the amount of S in the raw and auxiliary materials fed into the blast furnace, which is called the S load in the furnace. That is to say, the S load of the blast furnace unit into the furnace affects the S content in the blast furnace gas, and also affects the concentration and production of SO ₂ emitted by the hot blast stove.

In April 2019, five ministries and commissions including the National Ministry of Ecology and Environment and the National Development and Reform Commission issued the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Iron and Steel Industry", which requires the emission of pollutant SO ₂ from iron-making hot blast stoves in new (including relocation) projects across the country The concentration limit is 50mg/m ³ , which is the current implementation of the national standard "Air Pollutant Emission Standard for Ironmaking Industry" GB(28663-2012). ³ half. At present, there is a phenomenon that the SO ₂ emitted from the combustion of the hot blast stove cannot stably meet the ultra-low emission requirements at all times in the current iron and steel plants. Therefore, it is necessary to set up a source control system from the blast furnace raw materials to help the blast furnace to control the source S elements in order to reduce the S load of the furnace.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a source control method and system for sulfur dioxide emission in the flue gas of an ironmaking hot blast furnace, aiming to solve the problem of source sulfur control in the blast furnace ironmaking process.

The present invention is achieved through the following technical solutions:

The invention provides a source management and control system for the emission of sulfur dioxide in flue gas from an iron-smelting hot blast stove, including a data acquisition and transmission module, a memory, an analysis and calculation module, a data monitoring module, and a control terminal. The input ends of the data acquisition and transmission module are respectively connected with the data monitoring module The module is connected to the metering system and the component detection system that comes with the blast furnace body, and its output terminals are respectively connected to the analysis and calculation module and the control terminal; the data acquisition and transmission module and the memory, and between the analysis and calculation module and the control terminal respectively interact. connect.

Further, the analysis and calculation module includes a blast furnace gas sulfur concentration calculation sub-module for calculating the sulfur concentration value C _BFG in the blast furnace gas, and its calculation formula is:

C _BFG = [(1-η ₁ -η ₂ )×L _t -L _{dust sludge} ]/G _bfg ;

in,

L _t =L _total /P _iron ;

L _total =∑W _i ·υ _i ;

η ₁ is the distribution ratio of sulfur in molten iron; η ₂ is the distribution ratio of sulfur in slag; L _t is the sulfur load value per unit of molten iron; G _bfg is the blast furnace gas generation per unit of molten iron; L _is the sampling Fixed value calculated from blast furnace gas dust removal and iron yard dust removal data; P _iron is the output of pig iron; L _total is the total sulfur load value in the furnace, which is calculated according to the blast furnace metering data provided by the metering system, and _Wi is The mass of the material i into the furnace, kg; υ _i is the mass proportion of the sulfur element in the material i.

Further, the distribution ratio value of sulfur element in molten iron and slag, respectively, is calculated according to the component detection data provided by the component detection system, and the component detection data includes molten iron output and its sulfur content, slag output and its sulfur content. .

Further, the material i in the blast furnace measurement data includes: the amount of coke entering the furnace, the amount of pulverized coal entering the furnace, the amount of mixed ore entering the furnace, and the amount of limestone and dolomite entering the furnace.

Further, the analysis and calculation module also includes a hot blast stove combustion analysis for calculating the high value L _max of the sulfur load per unit of molten iron that meets the _standard concentration value C of sulfur dioxide emission in the flue gas emission of the hot blast stove under the current production and operating conditions according to the sulfur dioxide emission model. Computational submodule.

Further, the sulfur dioxide emission model is based on the sulfur concentration value C _BFG in the blast furnace gas and the combustion parameters of the hot blast stove to calculate the sulfur dioxide concentration value C _SO2 in the combustion flue gas of the hot blast stove and the sulfur dioxide concentration value in the flue gas actually monitored by the data monitoring module. The quantitative establishment is carried out, and its calculation formula is:

in:

为煤气总硫含量，mg：C_BFG为高炉煤气中含硫浓度值，mg/Nm³；V_bfg为热风炉燃烧所用高炉煤气的体积，Nm³；Vi为热风炉燃烧耗用高炉煤气以外的其他每种煤气的体积，Nm³；α为过剩空气系数；

为煤气燃烧的理论氧气需求量，Nm³/Nm³煤气；

为理论空气量， Nm³/Nm³煤气；Ci为燃用的其他煤气含硫浓度，mg/Nm³；V_y为单位煤气产生的实际烟气量， Nm³/Nm³煤气；

为单位煤气产生的理论烟气量，Nm³/Nm³煤气。

is the total sulfur content of the gas, mg: C _BFG is the sulfur concentration value in the blast furnace gas, mg/Nm ³ ; V _bfg is the volume of the blast furnace gas used for the combustion of the hot blast stove, Nm ³ ; Vi is the consumption of the blast furnace gas other than the blast furnace gas for the combustion of the hot blast stove The volume of each other gas, Nm ³ ; α is the excess air coefficient;

is the theoretical oxygen demand for gas combustion, Nm ³ /Nm ³ gas;

is the theoretical air volume, Nm ³ /Nm ³ gas; Ci is the sulfur concentration of other coal gas used for combustion, mg/Nm ³ ; V _y is the actual amount of flue gas produced by unit gas, Nm ³ /Nm ³ gas;

It is the theoretical flue gas volume produced by unit gas, Nm ³ /Nm ³ gas.

Further, the management and control terminal includes a real-time analysis and control sub-module of incoming sulfur sulfur load associated with the blast furnace gas sulfur concentration calculation sub-module, and a hot-blast stove combustion control and analysis sub-module associated with the hot-blast stove combustion analysis and calculation sub-module.

The present invention also provides a source control method for the emission of sulfur dioxide in flue gas from an iron-smelting hot blast stove, which adopts the above-mentioned system and includes the following steps:

S1: Collect the real-time monitoring value of the blast furnace and transmit it to the analysis and calculation module and the control terminal;

S2: The analysis and calculation module calculates the total sulfur load value L _total entering and leaving the furnace, the sulfur load value L _t per unit of molten iron, and the sulfur concentration value C _BFG in the blast furnace gas;

S3: Analyze and calculate the sulfur dioxide concentration value C _SO2 in the combustion flue gas of the hot blast stove with the sulfur concentration value C _BFG in the blast furnace gas and the combustion parameters of the hot blast stove;

S4: Establish a hot blast furnace flue gas sulfur dioxide emission model based on the sulfur load value of the furnace;

S5: Calculate, according to the sulfur dioxide emission model, the high value L _max of the sulfur load per unit of molten iron that meets the _standard concentration value C of sulfur dioxide emission in the flue gas emission of the hot blast furnace under the current production and operating conditions;

S6: The system automatically sets L _max as the threshold value, and judges the relationship between the real-time unit molten iron sulfur load value L _t and the threshold value L _max , and adjusts the combustion parameters of the hot blast stove or the incoming raw materials according to the system prompts.

Preferably, step S6 includes the following steps:

S61: Determine the relationship between L _t and L _max , if L _t <L _max , keep the existing parameter settings and operations unchanged;

S62: If L _t ≥ L _max , an alarm prompt will be given, and the combustion parameters of the hot blast _stove will be adjusted through the interface of the management and control terminal. The relationship with the _standard concentration value C of sulfur dioxide emission;

S63: If C _SO2 < C _standard , the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if C _SO2 ≥ C _standard , the system will issue a command to prompt whether to improve the quality of the raw fuel into the furnace? If you choose No, it will enter desulfurization mode, and the system will automatically calculate the minimum desulfurization efficiency that meets the standard for the whole time; _total , and then go to step S61.

By adopting the above-mentioned scheme, the method and system for controlling the source of sulfur dioxide emission in the flue gas of an iron-making hot blast stove of the present invention provide iron and steel enterprises with a system and method for controlling the combustion and discharge of sulfur dioxide from a hot blast stove from raw materials and operation sources. The analysis and composition analysis system calculates the optimal sulfur load value that meets the sulfur dioxide emission standard concentration of iron-making hot blast furnace under specific conditions, so as to control the source of sulfur-containing raw and auxiliary materials entering the blast furnace, so as to realize the exceeding limit of individual time periods. The boundary parameters are precisely controlled to achieve full-time compliance.

The advantages of the present invention are: the present invention controls the origin from the blast furnace raw materials and operation sources, and realizes the purpose of discharging sulfur dioxide in the flue gas of the hot blast furnace up to the standard at all times. It has the characteristics of few control actions, short time, compact rhythm and high production efficiency.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a frame diagram of the source management and control system of the present invention.

FIG. 2 is a structural diagram of the source control system of the present invention.

FIG. 3 is a flow chart of the source control system of the present invention.

Reference numerals: data acquisition and transmission module 1, memory 2, analysis and calculation module 3, data monitoring module 4, management and control terminal 5, metering system 6, component detection system 7; blast furnace gas sulfur concentration calculation sub-module 31, hot blast stove combustion analysis The calculation sub-module 32 ; the real-time analysis and control sub-module 51 of the sulfur load entering the furnace, and the hot-blast stove combustion control and analysis sub-module 52 .

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

As shown in Figures 1 and 2, the system for source control of sulfur dioxide emitted by hot blast furnace flue gas in blast furnace ironmaking process mentioned in this embodiment includes a data acquisition and transmission module 1, a memory 2, an analysis and calculation module 3, Data monitoring module 4 , management and control terminal 5 . Wherein, the input end of the data acquisition and transmission module 1 is respectively connected with the data monitoring module 4 and the metering system 6 and the component detection system 7 that come with the blast furnace body, and the output end thereof is respectively connected with the analysis and calculation module 3 and the management and control terminal 5; The data acquisition and transmission module 1 and the memory 2 and the analysis and calculation module 3 and the management and control terminal 5 are each connected interactively. In this way, by collecting the concentration value of sulfur dioxide emitted from the combustion of the hot blast stove and the real-time monitoring of the concentration value of sulfur dioxide in the flue gas volume, the blast furnace measurement data and component detection obtained from the measurement system 6 and the component detection system 7 of the blast furnace system are collected. The data is transmitted to the system through the data acquisition and transmission module 1 , and then analyzed, calculated and visualized through the analysis and calculation module 3 and the management and control terminal 5 respectively, and the data is also stored in the memory 2 . The analysis and calculation module 3 can interact with the management and control terminal 5, and is divided into a blast furnace gas sulfur concentration calculation sub-module 31 and a hot blast stove combustion analysis and calculation sub-module 32, and according to the monitoring data obtained by the system from the data monitoring module 4 and the management and control terminal 5. The interactive information is analyzed and calculated, and the calculation result is visually displayed on the management and control terminal 5 . The control terminal 5 is divided into a sub-module 51 for real-time analysis and control of the sulfur load entering the furnace and a sub-module 52 for the control and analysis of the combustion of the hot blast stove by constructing a computer software system.

During operation, according to the sulfur content of raw and auxiliary materials entering the blast furnace and the data of the incoming furnace, as well as the sulfur content of molten iron, the sulfur content of slag and the production amount of the output end of the blast furnace, the relevant complete data in the production cycle of the blast furnace process are established to establish mathematics. The model performs calculation analysis to predict the sulfur dioxide concentration in the flue gas emitted by the hot blast stove. Then, according to the actual concentration and production of sulfur dioxide emitted in the flue gas of the hot blast stove obtained by the data monitoring module, compare and analyze the predicted data, and iterate through data mining and machine learning to find out the quantifiable influence relationship and establish a basis for it. The hot blast furnace flue gas sulfur dioxide emission model of the blast furnace charging load parameters, and then according to this sulfur dioxide emission model, under the condition of unchanged production and operation factors, calculate the optimal charging sulfur load that meets the sulfur dioxide emission standard concentration of iron-making hot blast furnace , that is, the sulfur content of raw and auxiliary materials can be adjusted according to the optimal sulfur load into the furnace, so as to control the source of sulfur-containing raw and auxiliary materials entering the blast furnace.

Specifically, the system first connects to the blast furnace metering system and composition detection system, and collects the coke and sulfur content, the coal powder and the sulfur content, the mixed ore and the sulfur content, the limestone and the sulfur content. The amount of dolomite entering the furnace and its sulfur content, as well as the production of molten iron, sulfur content of molten iron, slag production, sulfur content of slag, blast furnace gas generation and other parameters, using the blast furnace gas sulfur concentration calculation sub-module to calculate the sulfur content in blast furnace gas For the concentration value C _BFG , first calculate the total sulfur load value L _total entering and leaving the furnace and the sulfur load value L _t per unit of molten iron according to the calculation formula of this system, namely: L _total =∑W _i ·υ _i , L _t =L _total /P _iron , where Wi is the mass of material _i into the furnace, kg; υ _i is the mass proportion of sulfur-containing elements in material i; P _iron is the output of pig iron. Since blast furnace gas, slag, molten iron and blast furnace gas dust are generated during blast furnace production, the distribution ratio of sulfur in molten iron and slag remains basically unchanged under stable operating conditions. η ₁ is the distribution ratio of sulfur element in molten iron, η ₂ is the distribution ratio of sulfur element in slag, then the sulfur concentration value in blast furnace gas can be calculated: C _BFG = [(1-η ₁ -η ₂ )× L _t -L _{dust sludge} ]/G _bfg , where G _bfg is the blast furnace gas generation per unit of molten iron; L _{dust sludge} is a fixed value calculated after sampling data such as blast furnace gas dust removal, iron dust removal dust, etc. enter.

其中：

The combustion analysis and calculation sub-module of the hot blast stove can calculate the sulfur dioxide concentration value in the combustion flue gas of the hot blast stove according to the calculated C _BFG value, according to the input combustion parameters of the hot blast stove, the type, amount of combustion medium, the composition of the combustion medium and its proportion. _CSO2 . The calculation method is:

in:

为煤气总硫含量，mg：C_BFG为高炉煤气中含硫浓度值，mg/Nm³；V_bfg为热风炉燃烧所用高炉煤气的体积，Nm³；Vi为热风炉燃烧耗用的高炉煤气以外的其他每种煤气的体积，Nm³；α为过剩空气系数；

为煤气燃烧的理论氧气需求量，Nm³/Nm³煤气；

为理论空气量，Nm³/Nm³煤气；Ci为燃用的其他煤气含硫浓度，mg/Nm³；V_y为单位煤气产生的实际烟气量，Nm³/Nm³煤气；

为单位煤气产生的理论烟气量，Nm³/Nm³煤气。CO、C₂H₄，O₂等分别代表煤气中相应气体的体积分数，％。并通过数据监测模块实际监测到的烟气中二氧化硫的浓度，与理论计算出的二氧化硫浓度进行数据挖掘和机器学习，找出可量化的影响关系，建立基于高炉入炉负荷参数的热风炉烟气二氧化硫排放模型，且以此来计算出该生产操作条件下满足炼铁热风炉二氧化硫排放标准浓度的单位铁水的入炉硫负荷高值L_max。

is the total sulfur content of the gas, mg: C _BFG is the sulfur concentration value in the blast furnace gas, mg/Nm ³ ; V _bfg is the volume of the blast furnace gas used for the combustion of the hot blast stove, Nm ³ ; Vi is the blast furnace gas other than the blast furnace gas consumed by the hot blast stove combustion The volume of each other gas, Nm ³ ; α is the excess air coefficient;

is the theoretical oxygen demand for gas combustion, Nm ³ /Nm ³ gas;

is the theoretical air volume, Nm ³ /Nm ³ gas; Ci is the sulfur concentration of other coal gas used for combustion, mg/Nm ³ ; V _y is the actual amount of flue gas produced by unit gas, Nm ³ /Nm ³ gas;

It is the theoretical flue gas volume produced by unit gas, Nm ³ /Nm ³ gas. CO, C ₂ H ₄ , O ₂ , etc. represent the volume fraction, %, of the corresponding gas in the coal gas, respectively. And the concentration of sulfur dioxide in the flue gas actually monitored by the data monitoring module is used for data mining and machine learning with the theoretically calculated concentration of sulfur dioxide to find out the quantifiable influence relationship, and establish a hot blast furnace flue gas based on blast furnace load parameters. The sulfur dioxide emission model is used to calculate the high value L _max of the sulfur load per unit of molten iron that meets the sulfur dioxide emission standard concentration of the iron-making hot blast furnace under the production operating conditions.

The real-time analysis and control sub-module of sulfur load into the furnace displays the names of different sulfur-containing materials entering the blast furnace, the amount of sulfur-containing materials and the corresponding proportion of sulfur load into the furnace through the construction of graphs, tables and other visual interfaces, and calculates the sulfur load Lt per unit of molten iron. ; The system automatically sets the calculated L _max as the threshold, and if L _t ≥ L _max , an alarm will be prompted.

By building an interactive interface, the hot blast stove combustion control analysis sub-module guides the user to input the type of gas (such as blast furnace gas, converter gas, coke oven gas) used in the hot blast stove, the proportion of different types of consumption, and other gases except blast furnace gas. The preset analysis conditions such as component content, sulfur content, air excess coefficient, theoretical combustion temperature, etc., are linked to the L _t value calculated in the real-time analysis and control sub-module of furnace sulfur load, and the hot blast furnace flue gas is predicted through the sulfur dioxide emission model. The emission concentration value C _SO2 of medium sulfur dioxide is displayed in the form of a table through the computer display interface, and the relationship between C _SO2 and the standard concentration value C _standard of sulfur dioxide emission is also displayed. The combustion parameters of the hot blast stove are set within a reasonable range in the system. This range is automatically set according to the theoretical combustion temperature of the hot blast stove. If the input combustion parameters exceed the reasonable range calculated by the system, the system will display "Cannot meet the Combustion requirements", do not participate in subsequent calculations.

Referring to Fig. 3 again, the method for source control of sulfur dioxide emitted by the hot blast furnace flue gas in the blast furnace ironmaking process of the present invention will be described in detail below, which specifically includes the following steps:

S1: Collect the real-time monitoring value of the blast furnace and transmit it to the analysis and calculation module and the control terminal;

S2: The analysis and calculation module calculates the output and sulfur content data of the blast furnace metering system, such as molten iron, slag, and blast furnace gas, and calculates the total sulfur load L _total in the furnace. , slag output, slag sulfur content, blast furnace gas generation and other parameters, calculate the sulfur concentration C _BFG in blast furnace gas;

S3: By obtaining or inputting the combustion conditions parameters such as the combustion medium and air excess coefficient of the hot blast stove, the analysis of the sulfur dioxide concentration in the flue gas emitted by the hot blast stove is realized;

S4: Establish a sulfur dioxide emission model in hot blast furnace flue gas based on blast furnace sulfur load parameters;

S5: according to the sulfur dioxide emission model, calculate the highest sulfur load high value L _max of the unit molten iron that meets the _standard concentration value C of sulfur dioxide emission of the hot blast furnace under the production and operating conditions;

S6: The system automatically sets L _max as the threshold value, and judges the relationship between the calculated real-time unit molten iron sulphur load value L _t and L _max of the blast furnace, and the system prompts. If L _t exceeds the threshold value, proceed according to the system prompt. Adjustment of combustion parameters of hot blast stove or adjustment of incoming raw materials.

Further, the specific steps of S6 include:

S61: Determine the relationship between _Lt and _Lmax , if Lt< _Lmax , keep the existing parameter settings and operations unchanged;

S62: If L _t ≥ L _max , an alarm will be given, and the combustion parameters of the hot blast stove are adjusted within a certain range through the interface of the management and control system. According to the adjusted parameters, the model is used to predict, and the system automatically inputs the predicted sulfur dioxide concentration value C. _SO2 , and judge its relationship with emission _standard C;

S63: If C _SO2 < C _standard , the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if C _SO2 ≥ C _standard , the system sends an instruction to adjust the raw materials into the furnace according to the prompts to reduce the total sulfur load L _total , Go to step S61 again.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (9)

1. An ironmaking hot blast stove flue gas sulfur dioxide emission source control system, characterized in that it comprises a data acquisition and transmission module (1), a memory (2), an analysis and calculation module (3), a data monitoring module (4), a control Terminal (5), the input ends of the data acquisition and transmission module are respectively connected with the data monitoring module and the metering system (6) and the component detection system (7) that come with the blast furnace body, and the output ends are respectively connected with The analysis and calculation module is connected with the management and control terminal; the data acquisition and transmission module and the memory, and the analysis and calculation module and the management and control terminal are respectively connected interactively. 2. ironmaking hot blast stove flue gas sulfur dioxide emission source control system according to claim 1, is characterized in that, described analysis calculation module comprises the blast furnace gas sulfur concentration calculation that is used to calculate the sulfur concentration value C _BFG in blast furnace gas Submodule (31), its calculation formula is: C _BFG = [(1-η ₁ -η ₂ )×L _t -L _{dust sludge} ]/G _bfg ; in, L _t =L _total /P _iron ; L _total =∑W _i ·υ _i ; η ₁ is the distribution ratio of sulfur in molten iron; η ₂ is the distribution ratio of sulfur in slag; L _t is the sulfur load value per unit of molten iron; G _bfg is the blast furnace gas generation per unit of molten iron; L _is the sampling Fixed value calculated from blast furnace gas dust removal and iron yard dust removal data; P _iron is the output of pig iron; L _total is the total sulfur load value in the furnace, which is calculated according to the blast furnace metering data provided by the metering system, and _Wi is The mass of the material i into the furnace, kg; υ _i is the mass proportion of the sulfur element in the material i. 3. ironmaking hot blast stove flue gas sulfur dioxide emission source control system according to claim 2, is characterized in that, the distribution ratio value of sulfur element in molten iron and slag respectively is calculated according to the composition detection data that composition detection system provides, And the component detection data includes molten iron production and its sulfur content, slag production and its sulfur content. 4. The ironmaking hot blast stove flue gas sulfur dioxide emission source control system according to claim 2, is characterized in that, the material i in the blast furnace metering data comprises: the amount of coke entering the furnace, the amount of pulverized coal entering the furnace, and the amount of mixed ore entering the furnace The amount of limestone and dolomite into the furnace. 5. The ironmaking hot blast stove flue gas sulfur dioxide emission source control system according to any one of claims 2-4, characterized in that, the analysis and calculation module also includes a sulfur dioxide emission model that is calculated to satisfy the current production operating conditions. The hot blast stove combustion analysis and calculation sub-module (32) is the high value _Lmax of the sulfur load of the unit molten iron, which is the _standard concentration value of sulfur dioxide emission in the flue gas discharge of the hot blast stove. 6. The ironmaking hot blast stove flue gas sulfur dioxide emission source control system according to claim 5, wherein the sulfur dioxide emission model calculates the hot blast stove with the sulfur concentration value C _BFG in the blast furnace gas and the hot blast stove combustion parameter. The sulfur dioxide concentration value C _SO2 in the combustion flue gas is quantitatively established with the sulfur dioxide concentration value in the flue gas actually monitored by the data monitoring module. The calculation formula is:

in:

is the total sulfur content of the gas, mg: C _BFG is the sulfur concentration value in the blast furnace gas, mg/Nm ³ ; V _bfg is the volume of the blast furnace gas used for the combustion of the hot blast stove, Nm ³ ; Vi is the consumption of the blast furnace gas other than the blast furnace gas for the combustion of the hot blast stove The volume of each other gas, Nm ³ ; α is the excess air coefficient;

is the theoretical oxygen demand for gas combustion, Nm ³ /Nm ³ gas;

is the theoretical air volume, Nm ³ /Nm ³ gas; Ci is the sulfur concentration of other coal gas used for combustion, mg/Nm ³ ; V _y is the actual amount of flue gas produced by unit gas, Nm ³ /Nm ³ gas;

It is the theoretical flue gas volume produced by unit gas, Nm ³ /Nm ³ gas. 7. The ironmaking hot blast stove flue gas sulfur dioxide emission source management and control system according to claim 6, wherein the control terminal comprises a furnace gas sulfur concentration calculation submodule associated with the furnace sulfur load real-time analysis and control submodule ( 51) A hot-blast stove combustion control analysis sub-module (52) associated with the hot-blast stove combustion analysis and calculation sub-module. 8. A method for source control of flue gas sulfur dioxide emission from an iron-smelting hot blast stove, characterized in that, using the system according to any one of claims 1-7, the method comprises the following steps: S1: Collect the real-time monitoring value of the blast furnace and transmit it to the analysis and calculation module and the control terminal; S2: The analysis and calculation module calculates the total sulfur load value L _total entering and leaving the furnace, the sulfur load value L _t per unit of molten iron, and the sulfur concentration value C _BFG in the blast furnace gas; S3: Analyze and calculate the sulfur dioxide concentration value C _SO2 in the combustion flue gas of the hot blast stove with the sulfur concentration value C _BFG in the blast furnace gas and the combustion parameters of the hot blast stove; S4: Establish a hot blast furnace flue gas sulfur dioxide emission model based on the sulfur load value of the furnace; S5: Calculate, according to the sulfur dioxide emission model, the high value L _max of the sulfur load per unit of molten iron that meets the _standard concentration value C of sulfur dioxide emission in the flue gas emission of the hot blast furnace under the current production and operating conditions; S6: The system automatically sets L _max as the threshold value, and judges the relationship between the real-time unit molten iron sulfur load value L _t and the threshold value L _max , and adjusts the combustion parameters of the hot blast stove or the incoming raw materials according to the system prompts. 9. The method for source control of flue gas sulfur dioxide emission from an ironmaking hot blast stove according to claim 8, wherein step S6 comprises the following steps: S61: Determine the relationship between L _t and L _max , if L _t <L _max , keep the existing parameter settings and operations unchanged; S62: If L _t ≥ L _max , an alarm prompt will be given, and the combustion parameters of the hot blast _stove will be adjusted through the interface of the management and control terminal. The relationship with the _standard concentration value C of sulfur dioxide emission; S63: If C _SO2 < C _standard , the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if C _SO2 ≥ C _standard , the system will issue a command to prompt whether to improve the quality of the raw fuel into the furnace? If you choose No, it will enter desulfurization mode, and the system will automatically calculate the minimum desulfurization efficiency that meets the standard for the whole time; _total , and then go to step S61.

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