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

Method and system for controlling emission source of sulfur dioxide in flue gas of iron-making hot blast stove Download PDF

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CN112226563A
CN112226563A CN202011162983.0A CN202011162983A CN112226563A CN 112226563 A CN112226563 A CN 112226563A CN 202011162983 A CN202011162983 A CN 202011162983A CN 112226563 A CN112226563 A CN 112226563A
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sulfur
hot blast
gas
blast stove
sulfur dioxide
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全魁
赵运建
范新库
孔大明
吕爽
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CISDI Engineering Co Ltd
CISDI Technology Research Center Co Ltd
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CISDI Engineering Co Ltd
CISDI Technology Research Center Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/10—Other details, e.g. blast mains
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/006—Automatically controlling the process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/42—Sulphur removal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2300/00—Process aspects
    • C21B2300/04—Modeling of the process, e.g. for control purposes; CII

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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Abstract

The invention belongs to the technical field of energy conservation and emission reduction of metallurgical steel, and provides a method and a system for controlling the emission source of flue gas sulfur dioxide of an iron-making hot blast stove, aiming at solving the problem of controlling the source sulfur element in the blast furnace iron-making process so as to achieve the purpose of full-time standard emission of the flue gas sulfur dioxide of the hot blast stove. The system comprises a data acquisition and transmission module, a memory, an analysis and calculation module, a data monitoring module and a control terminal, wherein the input end of the data acquisition and transmission module is respectively connected with the data monitoring module, a metering system and a component detection system of a blast furnace body, and the output end of the data acquisition and transmission module is respectively connected with the analysis and calculation module and the control terminal; the data acquisition and transmission module is in interactive connection with the memory, the analysis and calculation module and the control terminal. The invention performs origin control from the blast furnace raw materials and the operation source, and has the characteristics of less control action, short time, compact rhythm and high production efficiency.

Description

Method and system for controlling emission source of sulfur dioxide in flue gas of iron-making hot blast stove
Technical Field
The invention belongs to the technical field of energy conservation and emission reduction of metallurgical steel, and particularly relates to a method and a system for controlling a flue gas sulfur dioxide emission source of an iron-making hot blast stove.
Background
Pollutant SO of blast furnace ironmaking unit2The main part of the discharge is in the hot blast stove, the heating and combustion of which contains H2S and other sulfides in blast furnace gas or mixed gas, SO is discharged from the generated flue gas2. The sulfur compounds in the blast furnace gas are derived from the S amount in the raw and auxiliary materials of the blast furnace, which is called the charging S load. That is, the charging S load of a blast furnace unit affects the S content in the blast furnace gas and also the SO discharged from the hot blast stove2Concentration and production.
In 4 months of 2019, five ministries of national ministry of ecological environment and development and improvement committee issue 'opinion on promoting implementation of ultra-low emission in the steel industry' which requires that new (including relocation) projects in China emit pollutants SO2Emission concentration limit of 50mg/m3Is the emission limit value of 100mg/m of the iron-making hot blast stove (newly built, existing and special regions) of the national standard 'emission Standard of atmospheric pollutants for iron-making industry' GB (28663-3Half of that. SO discharged by combustion of hot blast stove in current iron and steel plant2The phenomenon of meeting the ultra-low emission requirement stably in all time. Therefore, it is necessary to provide a system for managing and controlling the source of the blast furnace raw material to help the blast furnace manage and control the source S element, so as to reduce the load of the furnace entering S.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for controlling a source of sulfur dioxide emission from flue gas of an ironmaking hot blast stove, and aims to solve a problem of controlling source sulfur in a blast furnace ironmaking process.
The invention is realized by the following technical scheme:
the invention provides a management and control system for a flue gas sulfur dioxide emission source of an iron-making hot blast stove, which comprises a data acquisition and transmission module, a memory, an analysis and calculation module, a data monitoring module and a management and control terminal, wherein the input end of the data acquisition and transmission module is respectively connected with the data monitoring module, a metering system and a component detection system of a blast furnace body, and the output end of the data acquisition and transmission module is 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 control terminal are respectively connected in an interactive manner.
Further, the analysis and calculation module is used for calculating the concentration value C of sulfur in the blast furnace gasBFGThe blast furnace gas sulfur concentration calculation submodule has the calculation formula as follows:
CBFG＝[(1-η1-η2)×Lt-Ldust and mud]/Gbfg；
Wherein the content of the first and second substances,
Lt＝Ltotal/Piron；
Ltotal＝∑Wi·υi；
η1the distribution ratio of sulfur element in molten iron; eta2The distribution ratio of sulfur element in the slag; l istIs the sulfur load value per unit of molten iron; gbfgThe blast furnace gas generation amount is unit molten iron; l isDust and mudCalculating a fixed value after sampling blast furnace gas dust removal ash and cast house dust removal ash data; pironThe yield of the raw iron; l istotalThe total sulfur load value is calculated according to the blast furnace metering data provided by the metering system, WiThe mass of the material i in the furnace is kg; upsilon isiIs the mass ratio of sulfur-containing elements in the material i.
Further, the distribution ratio of the sulfur element in the molten iron and the slag is calculated according to the component detection data provided by the component detection system, and the component detection data comprises the yield of the molten iron and the sulfur content therein, the yield of the slag and the sulfur content therein.
Further, the material i in the blast furnace metering data comprises: the coke charging amount, the coal powder charging amount, the mixed ore charging amount and the limestone and dolomite charging amount.
Further, the analysis and calculation module also comprises a concentration value C which is calculated according to the sulfur dioxide emission model and meets the standard of sulfur dioxide emission in the flue gas emission of the hot blast stove under the current production operation conditionSign boardHigh value L of charging sulfur load per unit molten ironmaxThe combustion analysis and calculation submodule of the hot blast stove.
Further, the sulfur dioxide discharge model is a sulfur concentration value C in blast furnace gasBFGAnd calculating the sulfur dioxide concentration value C in the combustion flue gas of the hot blast stove according to the combustion parameters of the hot blast stoveSO2The sulfur dioxide concentration value in the flue gas actually monitored by the data monitoring module is quantitatively established, and the calculation formula is as follows:
Figure BDA0002744845760000021
wherein:
Figure BDA0002744845760000022
Figure BDA0002744845760000023
Figure BDA0002744845760000024
Figure BDA0002744845760000025
Figure BDA0002744845760000026
Figure BDA0002744845760000027
the total sulfur content of the coal gas is mg: cBFGConcentration value of sulfur in blast furnace gas, mg/Nm3；VbfgVolume, Nm, of blast furnace gas used for combustion in hot-blast stoves3(ii) a Vi is the volume of each gas except blast furnace gas consumed by the hot blast stove in combustion, Nm3(ii) a Alpha is the excess air coefficient;
Figure BDA0002744845760000031
theoretical oxygen demand, Nm, for gas combustion3/Nm3Coal gas;
Figure BDA0002744845760000032
theoretical amount of air, Nm3/Nm3Coal gas; ci is the sulfur concentration of other coal gas for combustion, mg/Nm3；VyActual amount of flue gas, Nm, produced per unit gas3/Nm3Coal gas;
Figure BDA0002744845760000033
theoretical amount of flue gas, Nm, produced per unit gas3/Nm3And (7) coal gas.
Further, the control terminal comprises a furnace-entering sulfur load real-time analysis control submodule and a hot blast stove combustion control analysis submodule, wherein the furnace-entering sulfur load real-time analysis control submodule is associated with the blast furnace gas sulfur concentration operator module, and the hot blast stove combustion control analysis submodule is associated with the hot blast stove combustion analysis calculation submodule.
The invention also provides a method for controlling the emission source of the sulfur dioxide in the flue gas of the ironmaking hot blast stove, which adopts the system and comprises the following steps:
s1: collecting a real-time monitoring value of the blast furnace, and transmitting the real-time monitoring value to an analysis and calculation module and a control terminal;
s2: the analysis and calculation module calculates the total sulfur load value L of the furnacetotalSulfur load value L per molten irontAnd the concentration C of sulfur in the blast furnace gasBFG；
S3: by the concentration value C of sulfur in blast furnace gasBFGAnd the concentration value C of the combustion parameters of the hot blast stove to the sulfur dioxide in the combustion flue gas of the hot blast stoveSO2Carrying out analysis calculation;
s4: establishing a hot blast stove flue gas sulfur dioxide discharge model based on the charging sulfur load value;
s5: calculating a concentration value C meeting the emission standard of sulfur dioxide in the flue gas emission of the hot blast stove under the current production operation condition according to a sulfur dioxide emission modelSign boardHigh value L of charging sulfur load per unit molten ironmax；
S6: system auto-setting LmaxIs a threshold value, and judges the charging sulfur load value L of the unit molten iron in real timetAnd a threshold value LmaxAccording to the relation, the combustion parameters of the hot blast stove or the raw materials entering the stove are adjusted according to the system prompt.
Preferably, step S6 includes the following steps:
s61: judgment of LtAnd LmaxIf L is a relationship oft＜LmaxIf so, the existing parameter setting and operation are maintained unchanged;
s62: if L ist≥LmaxThen, alarming and prompting are carried out, the combustion parameters of the hot blast stove are adjusted through the interface of the control terminal, and the system predicts the sulfur dioxide concentration value C in the discharged flue gas by using a sulfur dioxide discharge model according to the adjusted parametersSO2And judging the concentration value C corresponding to the sulfur dioxide emission standardSign boardThe relationship of (1);
s63: if CSO2＜CSign boardIf so, the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if CSO2≥CSign boardThe system issues an instruction to indicate whether to improve the quality of the raw fuel entering the furnace? If not, entering a desulfurization mode, and automatically calculating the lowest desulfurization efficiency meeting the full-time standard by the system; if the selection is yes, the method enters a source control mode, the system automatically provides the source control mode, the raw materials entering the furnace are adjusted according to the prompt, and the total sulfur load L entering the furnace is reducedtotalThen, step S61 is performed.
By adopting the scheme, the method and the system for controlling the emission source of the sulfur dioxide in the flue gas of the ironmaking hot blast stove provide a set of system and a method for controlling the combustion emission of the sulfur dioxide in the hot blast stove from raw materials and operation sources for iron and steel enterprises, and the optimal furnace sulfur load value meeting the emission standard concentration of the sulfur dioxide in the ironmaking hot blast stove under specific conditions is calculated by butting the conventional detection analysis and composition analysis systems, so that the source control is carried out on the sulfur-containing raw and auxiliary materials entering the blast furnace, the accurate control on the boundary parameters which are over-limited in individual time periods is realized, and the standard emission in the whole time period is realized.
The invention has the advantages that: the invention performs origin control from the blast furnace raw material and the operation source, and realizes the purpose of full-time standard emission of sulfur dioxide in the flue gas of the hot blast furnace. The method has the characteristics of less control action, short time, compact rhythm and high production efficiency.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
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In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a block diagram of a source management and control system according to the present invention.
Fig. 2 is a structural diagram of a source management and control system according to the present invention.
Fig. 3 is a flowchart of a source management and control system according to the present invention.
Reference numerals: the system 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, a metering system 6 and a component detection system 7; the system comprises a blast furnace gas sulfur concentration calculation operator module 31 and a hot blast stove combustion analysis calculation submodule 32; a furnace-entering sulfur load real-time analysis and control submodule 51 and a hot blast stove combustion control and analysis submodule 52.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
As shown in fig. 1 and 2, the system for source control of sulfur dioxide emitted by a hot blast stove in a blast furnace ironmaking process according to the embodiment includes a data acquisition and transmission module 1, a memory 2, an analysis and calculation module 3, a data monitoring module 4, and a control terminal 5. The input end of the data acquisition and transmission module 1 is respectively connected with the data monitoring module 4, a metering system 6 and a component detection system 7 of the blast furnace body, and the output end of the data acquisition and transmission module is respectively connected with the analysis and calculation module 3 and the control terminal 5; the data acquisition and transmission module 1 and the memory 2, and the analysis and calculation module 3 and the control terminal 5 are respectively connected in an interactive manner. Like this, through the real-time supervision of the sulfur dioxide concentration value in gathering the sulfur dioxide concentration value in the sulfur dioxide of hot-blast furnace burning emission and the flue gas volume to the blast furnace measurement data and the composition detection data that will obtain from the measurement system 6 of blast furnace system own, composition detecting system 7 transmit this system to through data acquisition and transmission module 1, and then carry out analytical calculation and visual display respectively through analytical calculation module 3 and management and control terminal 5, also with data storage in memory 2 simultaneously. The analysis and calculation module 3 can interact with the 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 carries out analysis and calculation according to the monitoring data acquired by the system from the data monitoring module 4 and the interaction information of the control terminal 5, and the calculation result is visually displayed on the control terminal 5. The control terminal 5 is divided into a furnace sulfur load real-time analysis control submodule 51 and a hot blast stove combustion control analysis submodule 52 by constructing a computer software system.
During operation, a mathematical model is established for calculation and analysis according to the sulfur content and the charging amount data of the charging raw and auxiliary materials at the input end of the blast furnace, and the related complete data of the sulfur content of the molten iron, the sulfur content of the slag, the generation amount and the like at the output end in the production cycle of the blast furnace, so as to predict the sulfur dioxide concentration in the flue gas discharged by the hot blast furnace. And then according to the actual sulfur dioxide concentration and the actual sulfur dioxide output in the flue gas of the hot blast stove obtained by the data monitoring module, the comparison analysis is carried out with the prediction data, the iteration is carried out through data mining and machine learning, quantifiable influence relation is found out, a hot blast stove flue gas sulfur dioxide emission model based on blast furnace charging load parameters is established, and then according to the sulfur dioxide emission model, under the condition that production operation factors are not changed, the optimal charging sulfur load meeting the standard concentration of the sulfur dioxide emission of the iron-making hot blast stove is calculated, namely the sulfur content of the original and auxiliary materials can be selected to be regulated and controlled according to the optimal charging sulfur load, so that the sulfur-containing original and auxiliary materials entering the blast furnace are subjected to source control.
Specifically, the system firstly butts a metering system and a component detection system of the blast furnace, collects the coke charging amount and sulfur content, the coal powder charging amount and sulfur content, the mixed ore charging amount and sulfur content, the limestone and dolomite charging amount and sulfur content, the molten iron yield, the molten iron sulfur content, the slag yield, the slag sulfur content, the blast furnace gas generation amount and other parameters, and calculates the sulfur concentration value C in the blast furnace gas by using a blast furnace gas sulfur concentration operator moduleBFGFirstly, the total sulfur load value L of the furnace is calculated according to the calculation formula of the systemtotalAnd sulfur load value L of unit molten irontNamely: l istotal＝∑Wi·υi，Lt＝Ltotal/PironWherein W isiThe mass of the material i in the furnace is kg; upsilon isiThe mass ratio of sulfur-containing elements in the material i is; pironAnd (4) producing the crude iron. As blast furnace gas, slag, molten iron and blast furnace gas dust removal ash are generated in the production process of the blast furnace, the distribution ratio of sulfur elements in the molten iron and the slag is basically kept unchanged under stable operation conditions. Eta1The distribution ratio of sulfur element in molten iron, eta2The sulfur concentration value in the blast furnace gas can be calculated by taking the distribution ratio of the sulfur element in the slag as follows: cBFG＝[(1-η1-η2)×Lt-LDust and mud]/GbfgWherein G isbfgThe blast furnace gas generation amount is unit molten iron; l isDust and mudThe data of blast furnace gas dust removal ash, cast house dust removal ash and the like are sampled and then calculated to obtain fixed values, and the fixed values are manually input.
The hot blast stove combustion analysis and calculation submodule can obtain C according to calculationBFGCalculating the sulfur dioxide concentration value C in the combustion flue gas of the hot blast stove according to the input combustion parameters of the hot blast stove, the type and the amount of the combustion medium, the components of the combustion medium and the proportion thereofSO2. The calculation method comprises the following steps:
Figure BDA0002744845760000051
wherein:
Figure BDA0002744845760000052
Figure BDA0002744845760000053
Figure BDA0002744845760000061
Figure BDA0002744845760000062
the total sulfur content of the coal gas is mg: cBFGConcentration value of sulfur in blast furnace gas, mg/Nm3；VbfgVolume, Nm, of blast furnace gas used for combustion in hot-blast stoves3(ii) a Vi is the volume of each gas except blast furnace gas consumed by the hot blast stove, Nm3(ii) a Alpha is the excess air coefficient;
Figure BDA0002744845760000064
theoretical oxygen demand, Nm, for gas combustion3/Nm3Coal gas;
Figure BDA0002744845760000065
theoretical amount of air, Nm3/Nm3Coal gas; ci is other gas for combustionSulfur concentration, mg/Nm3；VyActual amount of flue gas, Nm, produced per unit gas3/Nm3Coal gas;
Figure BDA0002744845760000063
theoretical amount of flue gas, Nm, produced per unit gas3/Nm3And (7) coal gas. CO, C2H4，O2Etc. represent the volume fraction,%, of the corresponding gas in the gas, respectively. And carrying out data mining and machine learning on the concentration of sulfur dioxide in the flue gas actually monitored by the data monitoring module and the sulfur dioxide concentration theoretically calculated to find out quantifiable influence relation, establishing a hot blast furnace flue gas sulfur dioxide emission model based on blast furnace charging load parameters, and calculating the charging sulfur load high value L of unit molten iron meeting the standard concentration of the sulfur dioxide emission of the iron-making hot blast furnace under the production operation conditionmax。
The furnace-entering sulfur load real-time analysis and control submodule displays the names and the furnace-entering amounts of different sulfur-containing materials entering the blast furnace and the corresponding proportion of the furnace-entering sulfur loads through visual interfaces such as a construction chart and a table and calculates the sulfur load Lt of unit molten iron; the system automatically sets the calculated LmaxIs a threshold value, if Lt≥LmaxAnd then alarm prompt is carried out.
The hot blast stove combustion control analysis submodule guides a user to input preset analysis conditions of the coal gas types (such as blast furnace gas, converter gas and coke oven gas) for burning the hot blast stove, the ratio of different types of usage and the component content, sulfur content, air excess coefficient, theoretical combustion temperature and the like of other coal gas except the blast furnace gas by constructing an interactive interface, and links the preset analysis conditions to the L obtained by calculation in the furnace sulfur load real-time analysis control submoduletValue, predicting the discharge concentration C of sulfur dioxide in the flue gas of the hot blast stove through a sulfur dioxide discharge modelSO2And displaying results in a tabular form through a computer display interface and simultaneously displaying CSO2Concentration value C of sulfur dioxide emission standardSign boardThe magnitude relationship of (1). The combustion parameters of the hot blast stove are set in a reasonable range interval in the system, and the range interval is according to hot blastThe theoretical combustion temperature of the furnace is automatically set, and if the input combustion parameters exceed a reasonable range interval calculated by the system, the system displays that the combustion requirements cannot be met and does not participate in subsequent calculation.
Referring to fig. 3, the following details describe a method for performing source control on sulfur dioxide emitted from flue gas of a hot blast stove in a blast furnace ironmaking process according to the present invention, and specifically include the following steps:
s1: collecting a real-time monitoring value of the blast furnace, and transmitting the real-time monitoring value to an analysis and calculation module and a control terminal;
s2: the analysis and calculation module calculates according to the collected output and sulfur content data of molten iron, slag, blast furnace gas and the like of the blast furnace metering system and calculates the total sulfur load L in the furnacetotalAnd calculating the sulfur concentration C in the blast furnace gas by acquiring parameters such as the yield of the molten iron, the sulfur content of the molten iron, the yield of the slag, the sulfur content of the slag, the generation amount of the blast furnace gas and the likeBFG；
S3: the analysis of the concentration of sulfur dioxide in the flue gas discharged by the hot blast stove is realized by acquiring or inputting combustion condition parameters such as combustion media, excess air coefficients and the like of the hot blast stove;
s4: establishing a sulfur dioxide emission model in the flue gas of the hot blast stove based on the furnace-entering sulfur load parameter of the blast furnace;
s5: calculating a concentration value C meeting the sulfur dioxide emission standard of the hot blast stove under the production operation condition according to a sulfur dioxide emission modelSign boardThe highest charging sulfur load high value L of unit molten ironmax；
S6: system auto-setting LmaxIs a threshold value, and judges the calculated furnace-entering sulfur load value L of the blast furnace real-time unit molten irontAnd LmaxIf L is less than L, the system promptstAnd if the threshold value is exceeded, adjusting the combustion parameters of the hot blast stove or adjusting the raw materials entering the stove according to the system prompt.
Further, the specific step of S6 includes:
s61: judgment of LtAnd LmaxIf Lt < LmaxIf so, the existing parameter setting and operation are maintained unchanged;
s62: if L ist≥LmaxThen, alarming prompt is carried out, the combustion parameters of the hot blast stove are adjusted within a certain range through an interface of a control system, the model is used for predicting according to the adjusted parameters, and the system automatically inputs the sulfur dioxide concentration value C predicted to be dischargedSO2And judging it and emission standard CSign boardThe relationship of (1);
s63: if CSO2＜CSign boardIf so, the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if CSO2≥CSign boardThe system sends out an instruction, the raw materials entering the furnace are adjusted according to the prompt, and the total sulfur load L entering the furnace is reducedtotalThen, step S61 is performed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that 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, if such 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 such modifications and variations.

Claims (9)

1. A management and control system for a smoke sulfur dioxide emission source of an iron-making hot blast stove is characterized by comprising a data acquisition and transmission module (1), a memory (2), an analysis and calculation module (3), a data monitoring module (4) and a management and control terminal (5), wherein the input end of the data acquisition and transmission module is respectively connected with the data monitoring module, a metering system (6) and a component detection system (7) of a blast furnace body, and the output end of the data acquisition and transmission module is 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 control terminal are respectively connected in an interactive manner.
2. The system as claimed in claim 1, wherein the analyzing and calculating module is used to calculate a sulfur concentration value C in the blast furnace gasBFGThe blast furnace gas sulfur concentration calculating operator module (31)The calculation formula is as follows:
CBFG＝[(1-η1-η2)×Lt-Ldust and mud]/Gbfg；
Wherein the content of the first and second substances,
Lt＝Ltotal/Piron；
Ltotal＝∑Wi·υi；
η1the distribution ratio of sulfur element in molten iron; eta2The distribution ratio of sulfur element in the slag; l istIs the sulfur load value per unit of molten iron; gbfgThe blast furnace gas generation amount is unit molten iron; l isDust and mudCalculating a fixed value after sampling blast furnace gas dust removal ash and cast house dust removal ash data; pironThe yield of the raw iron; l istotalThe total sulfur load value is calculated according to the blast furnace metering data provided by the metering system, WiThe mass of the material i in the furnace is kg; upsilon isiIs the mass ratio of sulfur-containing elements in the material i.
3. The system as claimed in claim 2, wherein the distribution ratio of sulfur in the molten iron and the slag is calculated according to the component detection data provided by the component detection system, and the component detection data includes the yield of the molten iron, the sulfur content in the molten iron, the yield of the slag, and the sulfur content in the slag.
4. The system as claimed in claim 2, wherein the blast furnace measurement data includes material i: the coke charging amount, the coal powder charging amount, the mixed ore charging amount and the limestone and dolomite charging amount.
5. The system for managing and controlling the emission source of the sulfur dioxide in the flue gas of the ironmaking hot blast stove according to any one of claims 2 to 4, wherein the analysis and calculation module further comprises a module for calculating the emission of the sulfur dioxide in the flue gas of the hot blast stove under the current production operation condition according to a sulfur dioxide emission modelSulfur dioxide emission standard concentration value CSign boardHigh value L of charging sulfur load per unit molten ironmaxThe hot blast stove combustion analysis and calculation submodule (32).
6. The system as claimed in claim 5, wherein the sulfur dioxide emission model is a sulfur concentration value C in blast furnace gasBFGAnd calculating the sulfur dioxide concentration value C in the combustion flue gas of the hot blast stove according to the combustion parameters of the hot blast stoveSO2The sulfur dioxide concentration value in the flue gas actually monitored by the data monitoring module is quantitatively established, and the calculation formula is as follows:
Figure FDA0002744845750000021
wherein:
Figure FDA0002744845750000022
Figure FDA0002744845750000023
Figure FDA0002744845750000024
Figure FDA0002744845750000025
Figure FDA0002744845750000026
Figure FDA0002744845750000027
the total sulfur content of the coal gas is mg: cBFGConcentration value of sulfur in blast furnace gas, mg/Nm3；VbfgVolume, Nm, of blast furnace gas used for combustion in hot-blast stoves3(ii) a Vi is the volume of each gas except blast furnace gas consumed by the hot blast stove in combustion, Nm3(ii) a Alpha is the excess air coefficient;
Figure FDA0002744845750000028
theoretical oxygen demand, Nm, for gas combustion3/Nm3Coal gas;
Figure FDA0002744845750000029
theoretical amount of air, Nm3/Nm3Coal gas; ci is the sulfur concentration of other coal gas for combustion, mg/Nm3；VyActual amount of flue gas, Nm, produced per unit gas3/Nm3Coal gas;
Figure FDA00027448457500000210
theoretical amount of flue gas, Nm, produced per unit gas3/Nm3And (7) coal gas.
7. The system for managing and controlling the emission source of the sulfur dioxide in the flue gas of the iron-making hot blast stove according to claim 6, wherein the management and control terminal comprises a furnace-entering sulfur load real-time analysis and control submodule (51) associated with a blast furnace gas sulfur concentration sub-module, and a hot blast stove combustion management and control analysis submodule (52) associated with a hot blast stove combustion analysis and calculation submodule.
8. A method for managing and controlling the emission source of sulfur dioxide in flue gas of an iron-making hot blast stove, which is characterized by adopting the system of any one of claims 1 to 7, and comprises the following steps:
s1: collecting a real-time monitoring value of the blast furnace, and transmitting the real-time monitoring value to an analysis and calculation module and a control terminal;
s2: the analysis and calculation module calculates the total sulfur load value L of the furnacetotalSulfur load value L per molten irontAnd the concentration C of sulfur in the blast furnace gasBFG；
S3: by the concentration value C of sulfur in blast furnace gasBFGAnd the concentration value C of the combustion parameters of the hot blast stove to the sulfur dioxide in the combustion flue gas of the hot blast stoveSO2Carrying out analysis calculation;
s4: establishing a hot blast stove flue gas sulfur dioxide discharge model based on the charging sulfur load value;
s5: calculating a concentration value C meeting the emission standard of sulfur dioxide in the flue gas emission of the hot blast stove under the current production operation condition according to a sulfur dioxide emission modelSign boardHigh value L of charging sulfur load per unit molten ironmax；
S6: system auto-setting LmaxIs a threshold value, and judges the charging sulfur load value L of the unit molten iron in real timetAnd a threshold value LmaxAccording to the relation, the combustion parameters of the hot blast stove or the raw materials entering the stove are adjusted according to the system prompt.
9. The method for managing and controlling the emission source of the sulfur dioxide in the flue gas of the ironmaking hot blast stove according to the claim 8, wherein the step S6 comprises the following steps:
s61: judgment of LtAnd LmaxIf L is a relationship oft＜LmaxIf so, the existing parameter setting and operation are maintained unchanged;
s62: if L ist≥LmaxThen, alarming and prompting are carried out, the combustion parameters of the hot blast stove are adjusted through the interface of the control terminal, and the system predicts the sulfur dioxide concentration value C in the discharged flue gas by using a sulfur dioxide discharge model according to the adjusted parametersSO2And judging the concentration value C corresponding to the sulfur dioxide emission standardSign boardThe relationship of (1);
s63: if CSO2＜CSign boardIf so, the system recommends setting according to the adjusted combustion parameters of the hot blast stove; if CSO2≥CSign boardThe system issues an instruction to indicate whether to improve the quality of the raw fuel entering the furnace? If not, entering a desulfurization mode, and automatically calculating the lowest desulfurization efficiency meeting the full-time standard by the system; if so, entering into source controlThe mode is that the system automatically puts forward, the raw materials entering the furnace are adjusted according to the prompt, and the total sulfur load L entering the furnace is reducedtotalThen, step S61 is performed.
CN202011162983.0A 2020-10-27 2020-10-27 Method and system for controlling emission source of sulfur dioxide in flue gas of iron-making hot blast stove Pending CN112226563A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113421618A (en) * 2021-06-29 2021-09-21 鞍钢股份有限公司 Method for predicting sulfur content in blast furnace gas
CN114686629A (en) * 2022-04-02 2022-07-01 武汉钢铁有限公司 Reduce SO in blast furnace hot blast stove flue gas2Method of discharging
CN114686630A (en) * 2022-04-02 2022-07-01 武汉钢铁有限公司 Reduce SO in blast furnace hot blast stove flue gas2Burning process of discharged hot blast stove

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113421618A (en) * 2021-06-29 2021-09-21 鞍钢股份有限公司 Method for predicting sulfur content in blast furnace gas
CN113421618B (en) * 2021-06-29 2024-04-16 鞍钢股份有限公司 Method for predicting sulfur content in blast furnace gas
CN114686629A (en) * 2022-04-02 2022-07-01 武汉钢铁有限公司 Reduce SO in blast furnace hot blast stove flue gas2Method of discharging
CN114686630A (en) * 2022-04-02 2022-07-01 武汉钢铁有限公司 Reduce SO in blast furnace hot blast stove flue gas2Burning process of discharged hot blast stove
CN114686629B (en) * 2022-04-02 2023-08-18 武汉钢铁有限公司 Reduce SO in blast furnace hot-blast furnace flue gas 2 Method of venting

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