Method for analyzing and controlling concentration of SO2 in flue gas of steel rolling heating furnace

Abstract

The invention relates to the technical field of steel rolling environmental protection, in particular to a method for analyzing and controlling the concentration of SO2 in flue gas of a steel rolling heating furnace, which comprises the following steps of: constructing a steel rolling heating furnace flue gas monitoring platform and a flow path of same fuel used in different production lines in a pipe network, and establishing an excessive SO2 analysis and feedback control mechanism in the flue gas of the steel rolling heating furnace; the final source of the concentration of SO2 in flue gas is analyzed, the reason of upstream gas is fed back in time, the relation between the concentration of SO2 and the concentration of oxygen is studied for the steel rolling heating furnace and the reason, and'dynamic adjustment of excess air coefficient-real-time feedback of flue gas parameters' is taken as core logic. The method has the beneficial effects that the accident that flue gas SO2 of the fuel gas of the heating furnace exceeds the standard is avoided, and normal production of steel enterprises is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology in steel rolling, and in particular to a method for analyzing and controlling SO2 concentration in flue gas from steel rolling heating furnaces. Background Technology

[0002] The heating furnace is a major energy-consuming and pollutant-emitting device in the steel rolling process. While meeting heating quality requirements, the heating furnace must achieve both maximum energy efficiency and compliant pollutant emissions. The treatment of flue gas pollutants mainly falls into two categories: source control and end-of-pipe treatment. Analyzing the sources of flue gas pollutants from the heating furnace: SO2 is mainly introduced from combustion gas and generated through incomplete combustion.

[0003] Furnaces typically use blast furnace gas (CO content 20%-30%) and converter gas (CO content 60%-80%) as fuel. These gases generally have a high sulfur content and require desulfurization before reaching downstream furnaces. However, due to operational fluctuations in the desulfurization unit, desulfurization may be incomplete, leaving the gas with a still high sulfur content. If this gas is still sent to downstream furnaces, it may cause SO2 concentrations in the flue gas to exceed standards. Alternatively, the high-sulfur gas may not exceed standards because it mixes and redistributes with other fuel gases along the pipeline network before reaching the downstream furnaces. In this case, the sulfur content of the fuel gas may not be too high, and the SO2 concentration in the flue gas may not exceed the limit.

[0004] In addition, steel rolling heating furnaces mainly use gaseous fuels as combustion media. The combustion of fuel is a violent oxidation reaction, which is an oxidation reaction between the combustible components in the fuel and oxygen in the air. The combustion process is very complex. In order to achieve complete combustion of the fuel and make full use of the heat it releases, gaseous fuels will produce more SO2 when they are not completely burned, causing the SO2 concentration in the flue gas of the heating furnace to exceed the standard.

[0005] Therefore, regardless of whether the source treatment of coal gas is carried out by fine desulfurization or the end-of-combustion treatment of the heating furnace is adopted, a method for analyzing and controlling SO2 concentration in the flue gas of steel rolling heating furnace is needed to facilitate rapid analysis of the causes of SO2 concentration in steel rolling heating furnace. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a method for analyzing and controlling SO2 concentration in the flue gas of a steel rolling mill heating furnace. It constructs a monitoring platform for flue gas from the steel rolling mill heating furnace and establishes the flow paths of the same fuel used in different production lines within the pipeline network. A mechanism for analyzing and controlling SO2 exceedances in the flue gas of the steel rolling mill heating furnace is established. The method analyzes the ultimate sources of SO2 concentration in the flue gas and provides timely feedback on upstream gas-related causes. It also studies the relationship between SO2 and O2 concentrations related to the steel rolling mill heating furnace itself and the underlying causes. A flue gas environmental monitoring data platform and a dynamic combustion condition control system are established. With "dynamic adjustment of excess air coefficient - real-time feedback of flue gas parameters" as the core logic, this method achieves the analysis and control of SO2 concentration in the flue gas of the steel rolling mill heating furnace, preventing accidents caused by excessive SO2 levels in the furnace fuel gas flue gas and ensuring normal production in steel enterprises.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A method for analyzing and controlling SO2 concentration in flue gas from a steel rolling furnace, specifically including the following steps:

[0009] S1. Construct a flow model of fuel gas in the pipeline network; establish a node gas monitoring platform to collect gas monitoring data along the flow path;

[0010] S2. Establish an exhaust gas environmental monitoring data platform for different heating furnaces to obtain exhaust gas monitoring data of each heating furnace in real time during production.

[0011] S3. Establish a dynamic combustion condition control system based on the stoichiometric ratio of gaseous fuels, set the excess air coefficient α, calculate the initial air supply based on the initial value of α and deliver it to the heater burner to establish the initial combustion conditions;

[0012] S4. The gas monitoring platform obtains the measured SO2 concentration throughout the entire flow path during the same time period, and compares and analyzes it with the measured SO2 concentration obtained from the exhaust gas monitoring platforms of other production line heating furnaces to determine the reasons for SO2 exceeding the standard and control them accordingly.

[0013] a) The measured SO2 concentration in the flue gas of a heating furnace is >50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was >50 mg / m³. 3 This is caused by the high sulfur content in the gas, and the high sulfur content is fed back to the blast furnace or coke oven to control the sulfur content in the gas.

[0014] b) Measured SO2 concentration in flue gas from a heating furnace > 50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was <50 mg / m³. 3Furthermore, the historical trend concentration value fluctuation range is <20%. The O2 content in the flue gas is retrieved from the environmental monitoring platform. O2 <8% is considered as oxygen-deficient in the furnace after combustion. For the oxygen-deficient working condition, with the air-fuel ratio of 2:1 corresponding to a calorific value of 2000 kcal as the benchmark, a dynamic relationship is established that "for every 100 kcal decrease in calorific value, the air-fuel ratio decreases by 0.1 simultaneously". The target air-fuel ratio λ corresponding to the current calorific value is calculated by formula. After correcting the real-time calorific value and locking it, the excess air coefficient α is then corrected to control O2, increasing the O2 content to 8%~12%, and finally achieving SO2 <50 mg / m³.

[0015] c) The measured SO2 concentration in the flue gas of a heating furnace is >50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was <50 mg / m³. 3 The O2 content in the flue gas from the heating furnace is 8%–12%. Check whether the monitoring equipment is damaged.

[0016] Furthermore, the flow model in step S1 covers the scope of nodes and gas pipelines between nodes; the nodes include gas holders, various heating furnace combination valves, chimneys, and gas pipeline connection intersections.

[0017] Furthermore, the gas monitoring data in step S1 includes gas pressure at each node, gas flow rate at each node, measured SO2 concentration, and O2 content.

[0018] Furthermore, the exhaust gas monitoring data of the heating furnace in step S2 includes: measured SO2 concentration and O2 content.

[0019] Furthermore, the dynamic combustion condition control system in step S3 uses "dynamic adjustment of excess air coefficient - real-time feedback of flue gas parameters" as its core logic to achieve complete combustion of gaseous fuels.

[0020] I. Calculation of Fuel Composition and Theoretical Air Quantity: Volume fraction of gaseous fuel used in steel rolling furnace; calculation of the theoretical air quantity V required for complete combustion of fuel based on component content. o The calculation formula is: V o =0.01×[0.5CO+0.5H2+1.5H2S+Σ(2.5C n H m [)-O2], where V o The unit is m³;

[0021] II. Initial Combustion Conditions and Process Coefficient Setting: Based on the theoretical air volume V calculated in step I. o The initial value of the excess air coefficient α is set to be 1.02 to 1.5. The excess air coefficient α is the difference between the actual supplied air volume V and the theoretical air volume V. o The ratio: α = V / V oThe flow controller calculates the initial air supply based on the actual flow rate of the gaseous fuel and the initial value of α, and delivers it to the burner of the heating furnace to establish the initial combustion conditions.

[0022] Furthermore, the target air-fuel ratio formula in step S4 is: λ=2-[(2000-Q) / 100]×0.1; Q is the real-time calorific value measured by the gas calorific value meter, in units of Kcal / m³.

[0023] Furthermore, in step S4, the excess air coefficient α is corrected. 修正 The formula is:

[0024] α 初始 =1.02+(8%-O 2初始 )×0.05; where, α 初始 Let α be the initial value; O 2初始 This is the first measurement of flue gas O2 concentration under oxygen-deficient conditions;

[0025] Δα = 0.04 × (8% - O 2实测 ); where Δα is the value of α that needs to be increased each time; O 2实测 Current O2 concentration in flue gas;

[0026] α 修正 =α 初始 +Δα.

[0027] Furthermore, the method for analyzing and controlling SO2 concentration in the flue gas of the steel rolling heating furnace is implemented by an electronic device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor.

[0028] Furthermore, the method for analyzing and controlling SO2 concentration in the flue gas of the steel rolling heating furnace is implemented through a computer-readable storage medium, on which a computer program is stored.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] By monitoring the flue gas from the heating furnace and the flow path of the fuel gas pipeline, and based on real-time data and basic information on SO2 concentration in the flue gas of the rolling mill heating furnace, the SO2 concentration information of each heating furnace is compared to determine whether the SO2 concentration limit has been reached. This allows for analysis of the source of sulfur content and enables early warning of SO2 concentration in the rolling mill heating furnace. O2 The concentration can also be monitored to allow for immediate human intervention and control, quickly analyze the causes of SO2 concentration in steel rolling furnaces, and provide feedback to upstream and downstream control centers so that they can adopt effective and targeted control measures to ensure that the SO2 concentration in steel rolling furnaces is within the control requirements, avoid accidents caused by excessive SO2 in furnace fuel gas flue gas, and ensure the normal production of steel rolling enterprises. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating the principle of SO2 concentration analysis and control in the heating furnace described in this invention.

[0032] Figure 2 This is a diagram of the gas pipeline system where the heating furnace described in this invention is located.

[0033] Figure 3 This is a graph showing the relationship between O2 content in the range of 4%-8% and SO2 as described in this invention.

[0034] In the diagram: 1. Chimney; 2. Heating furnace; 3. Gas holder; 4. Gas pipeline; 5. Heating furnace combination valve. Detailed Implementation

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0036] like Figures 1-2 As shown, a method for analyzing and controlling SO2 concentration in flue gas from a steel rolling furnace includes the following steps:

[0037] S1. Based on the distribution of heating furnaces in each production line within the upstream fuel gas pipeline network, construct the flow path of the same fuel gas in the pipeline network for different production lines, and construct a flow model of the fuel gas in the pipeline network. The flow model covers: nodes and gas pipelines 4 between nodes; the nodes include gas holders 3, combined valves 5 of each heating furnace, chimneys 1, and the intersection of gas pipelines 4; establish a node gas monitoring platform for the gas pipeline network flow model, collect gas monitoring data on the flow path, and obtain the O2 content in the flow model.

[0038] S2. Establish an exhaust gas environmental monitoring data platform for heating furnaces using the same fuel gas in different production lines, and obtain exhaust gas monitoring data of each heating furnace 2 in real time during production, and obtain the measured SO2 concentration of each heating furnace 2.

[0039] S3. Establish a dynamic combustion condition control system based on the stoichiometric ratio of gaseous fuels, with "dynamic adjustment of excess air coefficient - real-time feedback of flue gas parameters" as the core logic, to achieve complete combustion of gaseous fuels:

[0040] I. Calculation of Fuel Composition and Theoretical Air Quantity: Volume fraction of gaseous fuel used in steel rolling heating furnace 2; Calculation of the theoretical air quantity V required for complete combustion of fuel based on component content. o The calculation formula is: V o =0.01×[0.5CO+0.5H2+1.5H2S+Σ(2.5C n H m [)-O2], where V oThe unit is m³;

[0041] II. Initial Combustion Conditions and Process Coefficient Setting: Based on the theoretical air volume V calculated in step I. o The initial value of the excess air coefficient α is set to be 1.02 to 1.5. The excess air coefficient α is the difference between the actual supplied air volume V and the theoretical air volume V. o The ratio: α = V / V o The initial air supply is calculated based on the actual flow rate of the gaseous fuel using the flow controller and delivered to the burner of the heating furnace 2 to establish the initial combustion conditions.

[0042] S4. The gas monitoring platform obtains the measured SO2 concentration throughout the entire flow path during the same time period, and compares and analyzes it with the measured SO2 concentration obtained from the exhaust gas monitoring platforms of other production line heating furnaces to determine the reasons for SO2 exceeding the standard and control them accordingly.

[0043] a) The measured SO2 concentration in the flue gas of a heating furnace is >50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was >50 mg / m³. 3 This is caused by the high sulfur content in the gas, and the high sulfur content is fed back to the blast furnace or coke oven to control the sulfur content in the gas.

[0044] b) Measured SO2 concentration in flue gas from a heating furnace > 50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was <50 mg / m³. 3 Furthermore, the historical trend concentration value fluctuation range is <20%. The O2 content in the flue gas is retrieved from the environmental monitoring platform. O2 <8% is considered as oxygen-deficient in the furnace after combustion. For the oxygen-deficient working condition, with the air-fuel ratio of 2:1 corresponding to a calorific value of 2000 kcal as the benchmark, a dynamic relationship is established that "for every 100 kcal decrease in calorific value, the air-fuel ratio decreases by 0.1 simultaneously". The target air-fuel ratio λ corresponding to the current calorific value is calculated by formula, locked, and then the excess air coefficient α is adjusted to control O2, increasing the O2 content to 8% to 12%, and finally achieving SO2 <50 mg / m³.

[0045] c) The measured SO2 concentration in the flue gas of one heating furnace is >50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnace 2 of other production lines was <50 mg / m³. 3 The O2 content in the flue gas of heating furnace 2 is 8% to 12%. Check whether the monitoring equipment is damaged.

[0046] 1. Calculation of target air-fuel ratio (λ target) (based on real-time calorific value of coal gas)

[0047] Based on the real-time calorific value (Q, unit: Kcal / m³) measured by the gas calorific value analyzer, the target air-fuel ratio to be matched is calculated using the following formula: λ 目标=2-[(2000-Q) / 100]×0.1

[0048] - Symbol definition:

[0049] -Q: Real-time measured calorific value of coal gas (Kcal / m³, obtained on-site by a calorific value meter, typically ranging from 1800 to 2200 Kcal / m³).

[0050] -2: The baseline air-fuel ratio corresponding to 2000 kcal of coal gas;

[0051] -[(2000-Q) / 100]×0.1: Air-fuel ratio correction when the calorific value deviates from 2000Kcal; the correction is -0.1 for every 100Kcal decrease in calorific value.

[0052] -Example verification:

[0053] -When Q=2000Kcal: λ 目标 =2-[(2000-2000) / 100]×0.1=2; meets the benchmark;

[0054] -When Q=1900Kcal: λ 目标 =2-[(2000-1900) / 100]×0.1=1.9; Correct λ 目标 Increase the calorific value to 2000Kcal, and adjust α based on 2000Kcal;

[0055] -When Q=2100Kcal: λ 目标 =2-[(2000-2100) / 100]×0.1=2.1; Reverse correction, reduce the real-time calorific value to 2000Kcal, and correct α based on 2000Kcal.

[0056] 2. The correction amount of α is directly calculated using the formula. Within the range of 1.02-1.5, α is gradually increased to improve the total air volume, ultimately precisely controlling O2 to 8%-12%. The complete correction formula for the excess air coefficient α is as follows:

[0057] 1) Formula for setting the initial value of α

[0058] Based on the initial O2 value (<8% in oxygen-deficient conditions), set an initial α value to ensure the starting point is within the range of 1.02-1.5, as shown in the following formula: α 初始 =1.02+(8%-O 2初始 )×0.05

[0059] - Symbol definition:

[0060] -O 2初始 The first measurement of flue gas O2 concentration under oxygen-deficient conditions

[0061] -1.02: The lower limit of α, to avoid α being too low and aggravating hypoxia;

[0062] -0.05: The optimal compensation value for the initial value of α.

[0063] -Constraint: If the calculation result > 1.5, take α. 初始 =1.5; if <1.02, take α. 初始 =1.02.

[0064] Example 1:

[0065] -O 2初始 =5.5%:α 初始 =1.02+(8-5.5)×0.05=1.02+0.125=1.145 (within 1.02-1.5);

[0066] Example 2

[0067] -O 2初始 =7.8%:α 初始 =1.02+(8-7.8)×0.05=1.02+0.01=1.03 (meets the lower limit requirement).

[0068] 2) Formula for calculating the α adjustment amount (Δα) (gradually increase the adjustment when O2 does not meet the target)

[0069] When O 2实测 When O2 is less than 8%, the required adjustment value α is calculated based on the difference between O2 and 8%, as shown in the following formula:

[0070] Δα = 0.04 × (8% - O 2实测 )

[0071] - Symbol definition:

[0072] -O 2实测 Current flue gas O2 concentration (%, <8% when oxygen is deficient);

[0073] -0.04: Single adjustment increment of α

[0074] Example 1

[0075] -O 2实测 =5.5% (gap 2.5%): Δα=0.04×2.5=0.1, α 修正 =α 初始 +0.1=1.145+0.1=1.245;

[0076] Example 2

[0077] -O 2实测 =7.2% (gap 0.8%): Δα=0.04×0.8=0.032, α修正 =α 初始 +0.032=1.03+0.032=1.062;

[0078] -Constraints: α 修正 ≤1.5, and take 1.5 when exceeding the limit to avoid excessive air leading to heat loss.

[0079] 3) The final value of α and the O2 compliance verification formula ensure that O2 is between 8% and 12%.

[0080] The final value of α is used to predict O2 and verify whether the target is met. The formula is as follows:

[0081] O 2预判 =8%+(α 修正 -α 初始 )×12.5

[0082] - Symbol definition:

[0083] -α 修正 : α initial + cumulative Δα, α 修正 ≤1.5;

[0084] -12.5: The estimated increase in O2 for every 0.01 increase in α, in percentage terms, derived from fitting multiple sets of field data, with an error of ±0.2%.

[0085] -Verification logic:

[0086] -If O 2预判 =8.3% (within 8%-12%): α is locked in at the end;

[0087] -If O 2预判 =11.8% (close to the upper limit): Stop increasing α and maintain the current value;

[0088] Example 1: α 初始 =1.145, α 修正 =1.145 + 0.1 = 1.245, then O 2预判 =8+(1.245-1.145)×12.5=8+1.25=9.25% (meets the standard).

[0089] Example 2: α 初始 =1.03, α 修正 =1.03 + 0.032 = 1.062, then O 2预判 =8 + (1.062 - 1.03) × 12.5 = 8 + 0.4 = 8.4%

[0090] c) The measured SO2 concentration in the flue gas of a heating furnace is >50 mg / m³ 3 The measured SO2 concentration in the flue gas from the heating furnaces of other production lines was <50 mg / m³.3 The O2 content in the flue gas from the heating furnace is 8%–12%, and the operation of the monitoring equipment is checked.

[0091] The exhaust gas monitoring data of the heating furnace 2 in step S2 includes: measured SO2 concentration, O2 content, measured particulate matter concentration, and calculated particulate matter concentration.

[0092] Furthermore, the gas monitoring data in step S3 includes gas pressure at each node, gas flow rate at each node, measured SO2 concentration, and O2 content.

[0093] like Figure 3 As shown, there is an indirect relationship between the converted SO2 concentration and the oxygen content:

[0094] The oxygen content is controlled between 4% and 8%. During production, the SO2 concentration will exceed the standard abnormally.

[0095] The relationship between SO2 and O2 content is demonstrated as follows: When the oxygen content in the chimney is controlled within the range of 4% to 8% during online monitoring, the oxygen content in the heating furnace is between 1% and 2%, which is almost in a state of oxygen deficiency. Incomplete combustion occurs, and the sulfides in the gas cannot be completely burned, resulting in SO2 exceeding the measured standard.

[0096] Furthermore, the method for analyzing and controlling SO2 concentration in the flue gas of the steel rolling heating furnace 2 is implemented by electronic equipment, which includes a memory, a processor, and a computer program stored in the memory and running on the processor.

[0097] Furthermore, the method for analyzing and controlling SO2 concentration in the flue gas of the steel rolling heating furnace 2 is implemented through a computer-readable storage medium, on which a computer program is stored.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for analyzing and controlling the concentration of SO2 in the flue gas of a steel rolling heating furnace, characterized in that, Specifically comprising the following steps: S1, a flow model of fuel gas in the pipe network is constructed; a node gas monitoring platform is established to collect gas monitoring data on the flow path; S2, a waste gas environmental monitoring data platform is established for different heating furnaces to obtain real-time waste gas monitoring data of each heating furnace in the production state; S3, a dynamic combustion condition regulation system based on the stoichiometric ratio of gas fuel is established, the air excess coefficient a is set, the initial air supply is calculated according to the initial value of a and is delivered to the heating furnace burner to establish the initial combustion condition; S4, the SO2 measured concentration of the entire flow path in the same time period is obtained by the gas monitoring platform, and is compared and analyzed with the SO2 measured concentration obtained by the waste gas detection platform of other production line heating furnaces to obtain the reason for SO2 exceeding the standard and to control it: a) the measured concentration of SO2 in the flue gas of a heating furnace > 50 mg / m 3 b) the measured concentration of SO2 in the flue gas of a heating furnace > 50 mg / m 3 is caused by high sulfur content in the coal gas, and the high sulfur content is fed back to the blast furnace or coke oven to control the sulfur content in the coal gas; b) One heating furnace flue gas SO2 measured concentration > 50mg / m 3 Other production line heating furnace flue gas SO2 measured concentration < 50mg / m 3 And the historical trend concentration value range fluctuation < 20%, from the environmental monitoring platform to call the flue gas O2 content, O2 < 8% is considered to be poor oxygen in the combustion furnace, for the lean oxygen condition, with the coal gas calorific value 2000Kcal corresponding to the air-fuel ratio 2:1 as the benchmark, to establish the dynamic relationship of "heat value each reduced by 100 kilocalories, air-fuel ratio reduced by 0.1 synchronously", through formula calculation the target air-fuel ratio λ corresponding to the current heat value, correct the real-time heat value and then correct the air excess coefficient α control O2, to improve the O2 content to 8% ~ 12%, ultimately realize SO2 < 50mg / m³; c) One of the heating furnace flue gas SO2 measured concentration > 50mg / m 3 Other production line heating furnace flue gas SO2 measured concentration < 50mg / m 3 O2 content in the heating furnace flue gas 8% ~ 12%, check if the monitoring equipment is damaged.

2. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The flow model in step S1 covers: node and node gas pipeline; the node includes gas tank, each heating furnace combination valve, chimney and gas pipeline connection intersection.

3. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The gas monitoring data in step S1 includes: each node gas pressure, each node gas flow, SO2 measured concentration, O2 content.

4. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The waste gas monitoring data of the heating furnace in step S2 includes: SO2 measured concentration, O2 content.

5. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The dynamic combustion condition regulation system in step S3 takes "air excess coefficient dynamic adjustment-smoke gas parameter real-time feedback" as the core logic to realize complete combustion of gas fuel: I. Fuel composition and theoretical air quantity calculation: the volume fraction of gaseous fuel used in the steel rolling heating furnace; the theoretical air quantity V required for complete combustion of the fuel is calculated according to the component content o , and the calculation formula is: V o =0.01×[0.5CO+0.5H2+1.5H2S+Σ(2.5CH n H m )-O2], wherein the unit of V o is m³; II. Initial combustion condition and process coefficient setting: according to the theoretical air quantity V calculated in step I o , the initial value of air excess coefficient a is set to 1.02-1.5, and the air excess coefficient a is the ratio of actual air supply quantity V to theoretical air quantity V o : a = V / V o ; through the flow controller, the initial air supply quantity is calculated according to the actual flow of gaseous fuel and the initial value of a, and is delivered to the heating furnace burner to establish the initial combustion condition.

6. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The target air-fuel ratio formula in step S4 is: λ=2-[(2000-Q) / 100]×0.1; Q is the real-time heat value measured by the gas calorimeter, unit: Kcal / m³.

7. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The air excess factor α is corrected in step S4 修正 The formula is: α 初始 =1.02+(8%-O 2初始 )×0.05; where, α 初始 Let α be the initial value; O 2初始 This is the first measurement of flue gas O2 concentration under oxygen-deficient conditions; Δα = 0.04 x (8% - O 2实测 ); wherein, Δα is the value of α to be increased each time; O 2实测 : current flue gas O2 concentration; α 修正 =α 初始 +Δα.

8. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The rolling steel heating furnace flue gas SO2 concentration analysis and control method is realized by an electronic device, which includes a memory, a processor and a computer program stored on the memory and running on the processor.

9. The method for analyzing and controlling SO2 concentration in flue gas of a steel rolling heating furnace according to claim 1, characterized in that, The rolling steel heating furnace flue gas SO2 concentration analysis and control method is realized by a computer readable storage medium, and the computer readable storage medium stores a computer program.

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