Method for quantitatively judging air passing state of sintering desulfurization and denitrification system

Abstract

The invention relates to the technical field of sintering desulfurization and denitrification, in particular to a method for quantitatively judging the air passing state of a sintering desulfurization and denitrification system, and the air passing state is judged by accurately detecting main components, temperature, air speed and air quantity of flue gas in a pipeline before and after sintering desulfurization and denitrification and calculating the air overflow and air leakage of the system. The method has the beneficial effects that the phenomenon that the local temperature in the system is too high or even spontaneous combustion is caused by insufficient treatment capacity due to too high temperature and too large air pressure of sintering desulfurization and denitrification incoming air is avoided; meanwhile, the air leakage state of the system can be accurately detected, the situation that environment air rushes into the desulfurization and denitrification system due to low incoming air volume is avoided, and energy loss is reduced.

Description

A method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system Technical Field

[0001] This invention relates to the field of sintering desulfurization and denitrification technology, and in particular to a method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system. Background Technology

[0002] The sintering process generates a large amount of SO2 and NO. x Direct emission of flue gas would cause serious environmental pollution. The function of a desulfurization and denitrification system is to use various technologies to remove SO2 and NO from the flue gas. x The process removes or converts SO2 into harmless substances to meet environmental emission standards. Activated carbon desulfurization and denitrification utilizes the adsorption and catalytic properties of activated carbon to adsorb SO2 in flue gas under certain conditions, oxidizing it to sulfuric acid. Simultaneously, the active sites on the activated carbon surface react with NO... x Catalytic reduction is carried out to convert it into nitrogen gas. The activated carbon method has unique advantages in the field of sintering desulfurization and denitrification, and its application prospects are broad with continuous technological development and improvement.

[0003] In the desulfurization and denitrification process of sintered activated carbon, the air flow condition and system air leakage can seriously affect the desulfurization and denitrification efficiency and operational stability. Abnormal treatment of the sintering tail gas will not only allow a large amount of cold air to enter the system, causing a decrease in flue gas temperature and changes in humidity, affecting adsorption and catalytic performance, but will also cause fluctuations in flue gas flow, increase the load on subsequent treatment, and even lead to excessive pollutant emissions.

[0004] Patent No. CN202321001539.X discloses an automatic adjustment system for the exhaust volume of sintering flue gas desulfurization. This system, belonging to the field of flue gas desulfurization technology, addresses the problems of low control efficiency and unstable operation in existing technologies that rely on manual adjustment of individual air volumes for different process sections. This adjustment system can coordinate the air distribution across the entire process section, resulting in higher control efficiency. However, this patent does not quantitatively determine the airflow status and leakage situation in the sintering desulfurization and denitrification system.

[0005] Patent application CN202222609065.9 discloses a pelletizing flue gas desulfurization and denitrification device. This device includes an annular cooler, a rotary kiln, and a chain grate arranged sequentially along the flue gas flow direction. The chain grate is connected to the rotary kiln via a first flue. Along the flue gas flow direction, a first dust collector, an SCR denitrification system, and a first fan are sequentially connected to the first flue. The outlet of the first fan is connected to the front of the chain grate. A second flue is connected to the front of the chain grate. Along the flue gas flow direction, a main exhaust fan, a desulfurization and dust removal system, a booster fan, and a chimney are sequentially connected to the second flue. However, this patent cannot determine the airflow status in the pipes of the desulfurization and denitrification system or the system leakage.

[0006] Patent application CN202211034788.9 discloses a desulfurization and denitrification method to reduce the consumption of rotary kilns using chain grate machines. This method relates to the field of tail gas desulfurization and denitrification technology in the steel industry, aiming to overcome the problem of high raw material and fuel consumption in existing desulfurization and low-temperature SCR denitrification processes for pellet production using chain grate rotary kilns. In this method, a portion of the tail gas enters the second stage of the annular cooler to exchange heat with the pellets, and after heat exchange, it is circulated back to the chain grate machine to preheat the green pellets; another portion of the tail gas is desulfurized; the desulfurized tail gas is then divided into two parts: one part of the desulfurized tail gas enters the vertical cooling kiln to exchange heat with the pellets, and after heat exchange, it is mixed with the other part of the desulfurized tail gas and heated to the temperature required for denitrification; the cooled pellets are then discharged. This method can be used for desulfurization and denitrification in chain grate rotary kilns, but this patent does not consider the airflow conditions or system leakage.

[0007] Patent application number CN202010117599.2 discloses a sintering flue gas desulfurization and denitrification circulation system. Belonging to the metallurgical field, it solves the problems of high investment, high operating costs, and high load on desulfurization and denitrification equipment in existing sintering flue gas desulfurization and denitrification processes. The circulation system includes a sintering machine, an annular cooler, wind boxes, an A flue, a B flue, a main flue gas duct, and a chimney. Multiple wind boxes are evenly and symmetrically distributed on both sides of the sintering machine. One side of the wind box is partially or completely connected to the A flue, and the other side is partially or completely connected to the B flue. The A and B flues are combined and connected to one end of the main flue gas duct. The main flue gas duct is equipped with a desulfurization unit, a denitrification reactor, and a waste heat recovery unit. The annular cooler is located between the desulfurization unit and the denitrification reactor, and includes a high-temperature section and a low-temperature section. The tail end of the main flue gas duct is connected to the chimney. The system has low operating costs and saves energy, and is suitable for desulfurization and denitrification of sintering flue gas. However, the patent does not take into account the situation of air leakage or system air leakage.

[0008] Currently, traditional methods for judging the airflow status of sintering desulfurization and denitrification systems mostly rely on manual inspections or single-parameter monitoring. There is no quantitative method for judging the airflow status of sintering desulfurization and denitrification systems, and manual inspections are inefficient and highly subjective. Therefore, there is an urgent need for a method to judge the airflow status of sintering desulfurization and denitrification systems. Summary of the Invention

[0009] To overcome the shortcomings of existing technologies, this invention provides a method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system. By accurately detecting parameters such as the main components, temperature, wind speed, and air volume of the flue gas in the pipeline before and after sintering desulfurization and denitrification, the method provides information on system overflow and leakage under different operating conditions, thereby improving the accuracy of airflow status determination. This avoids insufficient processing capacity due to excessively high incoming air temperature and pressure during sintering desulfurization and denitrification, which could lead to localized high temperatures or even spontaneous combustion within the system. Simultaneously, it accurately detects system leakage, preventing ambient air from entering the desulfurization and denitrification system due to low incoming air volume, thus reducing energy consumption.

[0010] To achieve the above objectives, the present invention employs the following technical solution: a method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system. This method involves accurately detecting the main components, temperature, wind speed, and air volume of the flue gas in the pipelines before and after sintering desulfurization and denitrification, calculating system overflow and leakage, and thus determining the airflow status. Specifically, the method includes the following steps: S1. Measurement of airflow temperature in the sintering desulfurization and denitrification system: Using thermocouples, the airflow temperature in the pipelines before and after the sintering desulfurization and denitrification system is measured continuously. For each test group, the maximum reading is taken when the temperature fluctuation is ≤0.8%. The number of test groups is ≥5 groups, and the average value is used to obtain the total flue gas temperature T1 before the inlet and the total flue gas temperature T2 after the outlet of the sintering desulfurization and denitrification system. The units for T1 and T2 are K. S2. Measurement of airflow atmosphere in the sintering desulfurization and denitrification system: Using a gas analyzer, the volume concentrations of O2, SO2, and NO in the pipeline air before and after the sintering desulfurization and denitrification system are measured continuously and simultaneously. x Mass concentration: Once the fluctuation of each component is ≤15%, start recording O2, SO2, and NO. x Concentration versus time curve A O (t), A S (t), A N (t), B O (t), B S (t), B N (t), and then calculate the O2, SO2, NO in the flue gas of the main pipeline before the inlet of the sintering desulfurization and denitrification system. x Content c O c S c N And the O2, SO2, NO in the flue gas from the main pipeline after the outlet x Content C O C S CN S3. Measurement of airflow in the sintering desulfurization and denitrification system: Continuously measure the air velocity in the main pipes before and after the sintering desulfurization and denitrification system to obtain the time fluctuation curves of the sintering tail gas air velocity before and after the system, v(t) and V(t), and then calculate the operating flow rate q of the main pipe before sintering desulfurization and denitrification and the operating flow rate Q of the main pipe after treatment; S4. Quantitative calculation: Accurately calculate the total overflow and leakage of the desulfurization and denitrification system based on the system airflow temperature and airflow data measured in S1-S3; S5. Determination of airflow status: Determine the airflow status of the sintering desulfurization and denitrification system based on the data obtained in S1-S4, including desulfurization failure, denitrification failure, total leakage, total overflow, and abnormal airflow; total leakage includes weak leakage with oxygen consumption and system normal leakage, and total overflow includes weak overflow with oxygen consumption, front overflow and rear leakage, and system normal overflow.

[0011] Furthermore, in step S2, the flue gas O2, SO2, and NO in the main pipeline before the inlet of the sintering desulfurization and denitrification system... x Content c O c S c N The calculation method is as follows: ;O2, SO2, NO in the flue gas after the outlet main pipeline x Content C O C S C N The calculation method is as follows: Where t is the test synchronization time. The test start time, To test the completion time, c O C O All units are %, c S C S c N C N All units are mg·Nm -3 .

[0012] Furthermore, the calculation methods for the main flue gas flow rate q before sintering desulfurization and denitrification and the main flue gas flow rate Q after treatment in step S3 are as follows: ; Where S1 is the cross-sectional area of ​​the main pipeline at the test location before sintering desulfurization and denitrification, in meters (m²). 2 S2 represents the cross-sectional area within the test location of the main pipeline after sintering desulfurization and denitrification, in meters (m²). 2 The units for q and Q are meters. 3 ·h -1 .

[0013] Furthermore, the precise calculation method for total system overflow and leakage in S4 is as follows: ; Where η is the percentage of total overflow and leakage air (%), and ω is the absolute air volume difference (Nm). 3 ·h -1 .

[0014] Furthermore, the q∈[500000m] 3 ·h -1 ,∞)Q∈[500000m 3 ·h -1 ,∞), T1(K)∈[353.15K, 493.15K], T2(K)∈[333.15K, 453.15K].

[0015] Furthermore, the method for determining the airflow status in step S5 is as follows: a) When When, it is determined to be desulfurization failure α; b) when When desulfurization and denitrification are not ineffective, and 0 < η ≤ 25%, it is determined to be an air overflow in the sintering desulfurization and denitrification system; when -25% ≤ η < 0, it is determined to be an air leak in the sintering desulfurization and denitrification system; when desulfurization and denitrification are not ineffective, and 0 < η ≤ 1%, it is determined to be an air leak in the sintering desulfurization and denitrification system. When, it is determined to be a slight overflow of air accompanied by oxygen consumption δ; e) when desulfurization and denitrification have not failed, 1% < η ≤ 25%, and When the system is in a state of overflow, it is determined that there is air leakage at the front of the system and air leakage at the rear of the system ε-1, indicating a total overflow state. When the system is in normal overflow state ε-2; f) when desulfurization and denitrification have not failed, When -1%≤η<0, it is judged as a slight air leakage accompanied by oxygen consumption ζ-1; when -25%≤η<-1%, it is judged as a normal air leakage state of the system ζ-2; g) when desulfurization and denitrification have not failed, and η>25% or η<-25%, it is judged as an abnormal air passage θ.

[0016] Compared with existing technologies, the beneficial effects of this invention are: 1) By accurately detecting the main components, temperature, wind speed, and air volume of flue gas in the pipeline before and after sintering desulfurization and denitrification, the system overflow and leakage volumes under different operating conditions are provided, thereby improving the accuracy of judging the airflow status. This avoids insufficient processing capacity caused by excessively high incoming air temperature and high air pressure during sintering desulfurization and denitrification, which could lead to localized high temperatures or even spontaneous combustion within the system, thus improving the safety of the desulfurization and denitrification system, enhancing system operating capacity, and extending system service life.

[0017] 2) It can accurately detect the air leakage status of the system, avoid the influx of ambient air into the desulfurization and denitrification system due to low air volume, reduce energy loss and improve energy utilization. Attached Figure Description

[0018] Figure 1 is a flowchart of the quantitative judgment of the air flow status of the sintering desulfurization and denitrification system according to the present invention.

[0019] Figure 2 shows the A described in this invention. O (t), A S (t), A N (t), B O (t), B S (t), B N The curve of (t).

[0020] Figure 3 is a graph of v(t) and V(t) as described in this invention. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: As shown in Figures 1-3, a method for quantitatively judging the air flow status of a sintering desulfurization and denitrification system specifically includes the following steps: S1, S1, Measurement of air flow temperature of the sintering desulfurization and denitrification system: The temperature of the air flow in the sintering desulfurization and denitrification system before and after the sintering desulfurization and denitrification system is measured by thermocouples using a continuous measurement method. For each test, the maximum reading is taken when the temperature fluctuation is ≤0.8%. The number of test groups is ≥5 groups, and the average value is taken to obtain the total flue gas temperature T1 of the inlet of the sintering desulfurization and denitrification system and the total flue gas temperature T2 of the outlet of the sintering desulfurization and denitrification system; T1∈[353.15K, 493.15K], T2∈[333.15K, 453.15K].

[0022] S2. Measurement of the air atmosphere in the sintering desulfurization and denitrification system: Using a gas analyzer, the volume concentrations of O2, SO2, and NO in the duct air before and after the sintering desulfurization and denitrification system are measured continuously and simultaneously. x Mass concentration: Once the fluctuation of each component is ≤15%, start recording O2, SO2, and NO. x Content change curve over time A O (t), A S (t), A N (t), B O (t), B S (t), B N (t), and then calculate the O2, SO2, NO in the flue gas of the main pipeline before the inlet of the sintering desulfurization and denitrification system. x Content c O c S c N And the O2, SO2, NO in the flue gas from the main pipeline after the outlet x Content C O C S C N .

[0023] A O (t): Curve of O2 volume concentration in the duct air before the sintering desulfurization and denitrification system as a function of time; A S(t): Curve showing the change of SO2 mass concentration in the duct air before the sintering desulfurization and denitrification system over time; A N (t): NO₂ in the duct air before the sintering desulfurization and denitrification system x Mass concentration versus time curve; B O (t): Curve of O2 volume concentration in pipeline air after sintering desulfurization and denitrification system as a function of time; B S (t): Curve of SO2 mass concentration in pipeline air after sintering desulfurization and denitrification system as a function of time; B N (t): NO₂ in the pipeline after the sintering desulfurization and denitrification system x Mass concentration versus time curve; c O O2 content in the flue gas from the main pipeline before the inlet of the sintering desulfurization and denitrification system; c S SO2 content in the flue gas from the main pipeline before the inlet of the sintering desulfurization and denitrification system; c N NO2 in the flue gas before the inlet of the sintering desulfurization and denitrification system x Content; C O O2 content in the flue gas from the main pipeline after the inlet of the sintering desulfurization and denitrification system; C S SO2 content in the flue gas from the main pipeline after the inlet of the sintering desulfurization and denitrification system; C N NO2 in the main flue gas after the inlet of the sintering desulfurization and denitrification system x Content; O2, SO2, NO in the flue gas before the inlet of the sintering desulfurization and denitrification system x Content c O c S c N The calculation method is as follows: ;O2, SO2, NO in the flue gas after the outlet main pipeline x Content C O C S C N The calculation method is as follows: Where t is the test synchronization time. c is the test start time, c is the test completion time. O C O All units are %, c S C S c N C N All units are mg·Nm -3 .

[0024] S3. Measurement of airflow in the sintering desulfurization and denitrification system: Continuously measure the air velocity in the main duct before and after the sintering desulfurization and denitrification system to obtain the time fluctuation curves v(t) and V(t) of the exhaust gas velocity before and after the system. Then, calculate the operating flow rate q of the main duct before and after the sintering desulfurization and denitrification process; q∈[500000m 3 ·h-1 ,∞)Q∈[500000m 3 ·h -1 ,∞).

[0025] The calculation method is as follows: ; Where S1 is the cross-sectional area of ​​the main pipeline at the test location before sintering desulfurization and denitrification, in meters (m²). 2 S2 represents the cross-sectional area within the test location of the main pipeline after sintering desulfurization and denitrification, in meters (m²). 2 The units for q and Q are meters. 3 ·h -1 .

[0026] S4. Quantitative Calculation: Based on the system air temperature and air volume data measured in S1-S3, accurately calculate the total overflow and leakage of the desulfurization and denitrification system; the calculation method is as follows. ; Where η is the percentage of total overflow and leakage air (%), and ω is the absolute air volume difference (Nm). 3 ·h -1 .

[0027] S5. Airflow Status Judgment: Based on the data obtained from S1-S4, determine the airflow status of the sintering desulfurization and denitrification system, including desulfurization failure, denitrification failure, total air leakage (divided into slight air leakage with oxygen consumption and system normal air leakage), total air overflow (divided into slight air overflow with oxygen consumption, front air overflow and rear air leakage, and system normal air overflow). The method for judging abnormal airflow status is as follows: a) When When, it is determined to be desulfurization failure α; b) when When desulfurization and denitrification are not ineffective, and 0 < η ≤ 25%, it is determined to be an air overflow in the sintering desulfurization and denitrification system; when -25% ≤ η < 0, it is determined to be an air leak in the sintering desulfurization and denitrification system; when desulfurization and denitrification are not ineffective, and 0 < η ≤ 1%, it is determined to be an air leak in the sintering desulfurization and denitrification system. When, it is determined to be a slight overflow of air accompanied by oxygen consumption δ; e) when desulfurization and denitrification have not failed, 1% < η ≤ 25%, and When the system is in a state of overflow, it is determined that there is air leakage at the front of the system and air leakage at the rear of the system ε-1, indicating a total overflow state. When the system is in normal overflow state ε-2; f) when desulfurization and denitrification have not failed, When -1%≤η<0, it is judged as a slight air leakage accompanied by oxygen consumption ζ-1; when -25%≤η<-1%, it is judged as a normal air leakage state of the system ζ-2; g) when desulfurization and denitrification have not failed, and η>25% or η<-25%, it is judged as an abnormal air passage θ.

[0028] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0029] [Example] A method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system. The results of on-site tests of parameters such as airflow temperature, atmosphere, and wind speed under different operating conditions for multiple sintering desulfurization and denitrification systems are shown in Table 1: Table 1 - Test Results of Each Parameter The total overflow, leakage percentage η, absolute air volume difference ω, and sulfur dioxide and nitrogen oxide removal rates are calculated using the formula. , The wind conditions and their determination are shown in Table 2.

[0030] Table 2 - Calculation of Parameters and Judgment of Airflow Status In the examples, the quantitative judgment of the airflow status of the sintering desulfurization and denitrification system using the method of the present invention is compared with conventional experience judgment. The judgment is more precise and accurate. Traditional conventional experience judgment only compares the volume percentage of oxygen in the flue gas before and after the system. As shown in Table 2, Examples 1, 5, 6, 7, and 8 are judged as system leakage, while Examples 2, 3, and 4 are judged as system no leakage. Using the airflow status determined by the method of the present invention, the overflow and leakage amounts (η) are accurately calculated. It can be determined that the system in Example 1 is in state α or β, i.e., desulfurization and denitrification failure; the system in Example 2 is in state β, i.e., denitrification failure; the system in Example 3 is in state δ, i.e., weak overflow with oxygen consumption; the system in Example 4 is in state ε-2, i.e., normal overflow; the system in Example 5 is in state θ, i.e., abnormal airflow; the system in Example 6 is in state ζ-2, i.e., normal leakage; the system in Example 7 is in state ζ-1, i.e., weak leakage with oxygen consumption; and the system in Example 8 is in state ε-1, i.e., overflow at the front and leakage at the rear, resulting in total overflow. The above embodiments utilize the method of the present invention to provide necessary data judgment support for sintering desulfurization and denitrification production, avoiding insufficient processing capacity caused by excessively high incoming air temperature and high air pressure in sintering desulfurization and denitrification, which may lead to local high temperature or even spontaneous combustion in the system; at the same time, it can accurately detect the air leakage status of the system, avoiding the influx of ambient air into the desulfurization and denitrification system due to low incoming air volume, which may cause unnecessary energy loss.

[0031] 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 quantitatively determining the airflow status of a sintering desulfurization and denitrification system, characterized in that, By accurately detecting the main components, temperature, wind speed, and air volume of the flue gas in the pipelines before and after sintering desulfurization and denitrification, and calculating the system's overflow and leakage, the airflow status is determined. Specifically, the following steps are included: S1. Measurement of airflow temperature in the sintering desulfurization and denitrification system: Using thermocouples, the air temperature in the pipelines before and after the sintering desulfurization and denitrification system is measured continuously. For each test group, the maximum reading is taken when the temperature fluctuation is ≤0.8%. The number of test groups is ≥5 groups, and the average value is taken to obtain the total flue gas temperature T1 before the inlet and the total flue gas temperature T2 after the outlet of the sintering desulfurization and denitrification system. The units for T1 and T2 are K. S2. Measurement of airflow atmosphere in the sintering desulfurization and denitrification system: Using a gas analyzer, the volume concentrations of O2, SO2, and NO in the pipeline air before and after the sintering desulfurization and denitrification system are measured continuously and simultaneously. x Mass concentration: Once the fluctuation of each component is ≤15%, start recording O2, SO2, and NO. x Concentration versus time curve A O (t), A S (t), A N (t), B O (t), B S (t), B N (t), and then calculate the O2, SO2, NO in the flue gas of the main pipeline before the inlet of the sintering desulfurization and denitrification system. x Content c O c S c N And the O2, SO2, NO in the flue gas from the main pipeline after the outlet x Content C O C S C N S3. Measurement of airflow in the sintering desulfurization and denitrification system: Continuously measure the air velocity in the main pipes before and after the sintering desulfurization and denitrification system to obtain the time fluctuation curves of the sintering tail gas air velocity before and after the system, v(t) and V(t), and then calculate the operating flow rate q of the main pipe before sintering desulfurization and denitrification and the operating flow rate Q of the main pipe after treatment; S4. Quantitative calculation: Accurately calculate the total overflow and leakage of the desulfurization and denitrification system based on the system airflow temperature and airflow data measured in S1-S3; S5. Determination of airflow status: Determine the airflow status of the sintering desulfurization and denitrification system based on the data obtained in S1-S4, including desulfurization failure, denitrification failure, total leakage, total overflow, and abnormal airflow; total leakage includes weak leakage with oxygen consumption and system normal leakage, and total overflow includes weak overflow with oxygen consumption, front overflow and rear leakage, and system normal overflow.

2. The method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system according to claim 1, characterized in that, In step S2, the flue gas O2, SO2, NO in the main pipeline before the inlet of the sintering desulfurization and denitrification system x Content c O c S c N The calculation method is as follows: The flue gas after the outlet main pipeline contains O2, SO2, and NO. x Content C O C S C N The calculation method is as follows: Where t is the test synchronization time. The test start time, To test the completion time, c O C O All units are %, c S C S c N C N All units are mg·Nm -3 .

3. The method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system according to claim 1, characterized in that, In step S3, the operating flow rate q of the main flue gas before sintering desulfurization and denitrification and the operating flow rate q of the main flue gas after treatment are... The calculation method is as follows: ； Where S1 is the cross-sectional area of ​​the main pipeline at the test location before sintering desulfurization and denitrification, in meters (m²). 2 S2 represents the cross-sectional area within the test location of the main pipeline after sintering desulfurization and denitrification, in meters (m²). 2 The units for q and Q are meters. 3 ·h -1 .

4. The method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system according to claim 1, characterized in that, The precise calculation method for total system overflow and leakage in S4 is as follows: ； Where η is the percentage of total overflow and leakage air, in %; and ω is the absolute air volume difference, in Nm³. 3 ·h -1 .

5. The method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system according to claim 1, characterized in that, The q∈[500000m 3 ·h -1 ,∞)Q∈[500000m 3 ·h -1 ,∞), T1∈[353.15K, 493.15K], T2∈[333.15K, 453.15K].

6. The method for quantitatively determining the airflow status of a sintering desulfurization and denitrification system according to claim 1, characterized in that, The method for determining the airflow status in step S5 is as follows: a) When When, it is determined to be desulfurization failure α; b) when When desulfurization and denitrification are not ineffective, and 0 < η ≤ 25%, it is determined to be an air overflow in the sintering desulfurization and denitrification system; when -25% ≤ η < 0, it is determined to be an air leak in the sintering desulfurization and denitrification system; when desulfurization and denitrification are not ineffective, and 0 < η ≤ 1%, it is determined to be an air leak in the sintering desulfurization and denitrification system. When, it is determined to be a slight overflow of air accompanied by oxygen consumption δ; e) when desulfurization and denitrification have not failed, 1% < η ≤ 25%, and When the system is in a state of overflow, it is determined that there is air leakage at the front of the system and air leakage at the rear of the system ε-1, indicating a total overflow state. When the system is in normal overflow state ε-2; f) when desulfurization and denitrification have not failed, When -1%≤η<0, it is judged as a slight air leakage accompanied by oxygen consumption ζ-1; when -25%≤η<-1%, it is judged as a normal air leakage state of the system ζ-2; g) when desulfurization and denitrification have not failed, and η>25% or η<-25%, it is judged as an abnormal air passage θ.

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