Method for regulating sinter production based on flue gas no x Concentration

Abstract

This invention discloses a method based on NO in flue gas x A method for controlling the concentration in sintering production. This method includes the following steps: collecting the current denitrification rate (DN) of the denitrification system. rate and NO x Emission concentration target threshold OUT NO Calculate NO produced from sintered ore x Emission concentration target threshold IN NO Based on the unit time fuel quantity F and unit time NO produced by sintered ore within a preset historical time period x The emission concentration C was fitted to obtain the functional relationship 1, and the NO emission concentration per unit time was determined. x Equation 2 shows the functional relationship between emission concentration fluctuation C0 and fuel consumption per unit time F; if IN NO ≤C1+C 01 If IN NO >C1+C 01 Then, the fuel quantity F(IN) per unit time can be calculated according to equations 1 and 2. NO ), and adjust the fuel quantity F(IN) per unit time obtained. NO Continue sintering production. This invention can balance ultra-low emissions and sinter production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sintering in the metallurgical industry, and particularly relates to a sintering production regulation method based on flue gas NO x concentration, and further relates to a method for responding to abnormal flue gas NO x concentration in sintering production. BACKGROUND

[0002] Sintering flue gas desulfurization and denitrification technology has been widely applied. Specifically, for example, a denitrification system is arranged behind a sintering machine, and the denitrification system is used to perform denitrification treatment on flue gas discharged from the sintering machine while sinter production is performed by the sintering machine, so that the flue gas is discharged from the denitrification system to meet the ultra-low emission standard of environmental protection requirements. Overall, various types of desulfurization technology can achieve relatively stable effects in actual production, but the performance of denitrification technology varies greatly. For a considerable number of enterprises, denitrification has become a limiting link of sinter production, and production must be controlled according to the denitrification effect on a daily basis. The existing operation is to reduce sinter production when the flue gas NO x concentration is high and the denitrification outlet emission is unstable, so as to ensure that the outlet NO x concentration is stable below the ultra-low emission index.

[0003] However, in the existing operation, sinter production is often blindly reduced in order to ensure ultra-low emission, and usually either the reduction range is too small to ensure ultra-low emission, or the reduction range is too large to cause unnecessary loss of sinter production.

[0004] In view of the above production status, it is necessary to study a sinter production control technology that can balance ultra-low emission and sinter production. SUMMARY

[0005] To solve the above technical problems, the purpose of the present application is a sintering production regulation method based on flue gas NO x concentration, and particularly a method for responding to abnormal flue gas NO x concentration in sintering production.

[0006] To achieve the above-mentioned purpose of the application, an embodiment of the present application provides a sintering production regulation method based on flue gas NO x concentration, which includes the following steps:

[0007] collecting a current denitrification rate DN rate of the denitrification system and a NOx emission concentration target threshold OUT NO , and calculating a NO x emission concentration target threshold IN NO of sinter production according to the formula IN NO = OUT NO ÷(1-DN rate ).;

[0008] Based on the unit time fuel quantity F and unit time NOx emission concentration C of sintered ore production within a preset historical time period, the functional relationship 1 is obtained by fitting, and the functional relationship 2 between the unit time NOx emission concentration fluctuation C0 and the unit time fuel quantity F is determined.

[0009]

[0010]

[0011] Compare IN NO and C1+C 01 Size relationship;

[0012] If IN NO ≤C1+C 01 If so, the sintering production will be stopped and maintenance will be initiated.

[0013] If IN NO >C1+C 01 Then according to the formula IN NO =C2+k×F+C 02 Calculate fuel quantity per unit time F(IN) NO ), and adjust the fuel quantity F(IN) per unit time obtained. NO Continue sintering production.

[0014] Preferably, in step "If IN" NO >C1+C 01 Then according to the formula IN NO =C2+k×F+C 02 Calculate fuel quantity per unit time F(IN) NO ), and adjust the fuel quantity F(IN) per unit time obtained. NO "Continuing sintering production":

[0015] According to the formula IN NO =C2+k×F+C 02 Calculate fuel quantity per unit time F(IN) NO );

[0016] Based on the obtained fuel quantity per unit time F(IN) NO ) and the preset solid fuel ratio R, calculate the sintering feed amount F(IN) for sintering production. NO ) / R;

[0017] Controlled by the amount of fuel obtained per unit time F(IN) NO ), Sintering feed amount F(IN) NO Production continues.

[0018] Preferably, the current denitration rate DN rate is an average value of the denitration rate in the current unit time period, for example, preferably, the current denitration rate DN rate is an average value of the denitration rate in the current 1 hour.

[0019] Preferably, in the step of "determining the current denitration rate DN x based on the fuel quantity F per unit time and the NO NO emission concentration C in the sinter production in a preset historical time period", the unit time period is 1 hour, and the preset historical time period is not less than 120 hours, for example, preferably, the preset historical time period is any value in the range of 240h-360h.

[0020] Preferably, the units of OUT NO , IN NO , C, C1, C2, C0, C 01 and C 02 are mg / m 3 , and the units of F, F0 and F1 are t / h.

[0021] Compared with the prior art, the present application has the beneficial effects that: not only can the flue gas NO x concentration in the sinter production be stably maintained within the preset emission standard, thereby meeting the requirement of ultra-low emission, but also in the case of abnormal flue gas NO x concentration (for example, sudden large increase or exceeding the emission standard), the flue gas NO x concentration in the sinter production can be restored to normal or it can be screened whether the denitration system is abnormal, and more importantly, the sinter production quantity can be taken into account, so that the sinter production quantity is maximized, thereby avoiding the derived problems such as still abnormal emission or too low production quantity caused by blind reduction of production quantity in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 shows a functional relationship diagram of the fuel quantity F per unit time and the NO x emission concentration C in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be further described below in combination with specific embodiments.

[0024] An embodiment of the present application provides a sinter production control method based on the flue gas NO x concentration, which can control the fuel quantity in the sinter production based on at least the flue gas NO x concentration.

[0025] This control method can also be applied to the daily control of sintering production to ensure that the NO emission from the denitrification system in sintering production is within acceptable limits. x The concentration is stabilized within the target range, such as below ultra-low emission standards; or it can be applied to NO in flue gas during sintering production. x Abnormal control when the concentration suddenly increases or other abnormalities occur, such as the NO concentration in the denitrification system. x Excessive emissions (e.g., current NO emissions detected in the denitrification system) x Emission concentration reached NO x Emission concentration target threshold OUT NO This method can reduce NO in the flue gas emitted by the denitrification system. x The concentration will decrease or return to normal.

[0026] Furthermore, in addition to controlling NO in the flue gas during sintering production... x In addition to concentration, the control method of the present invention can also take into account maximizing the yield of sintered ore.

[0027] The following is a detailed description of each step of the control method of the present invention.

[0028] Step S100: Collect the current denitrification rate DN of the denitrification system. rate and NO x Emission concentration target threshold OUT NO According to the formula IN NO =OUT NO ÷(1-DN rate ), calculate NO produced from sintered ore x Emission concentration target threshold IN NO .

[0029] In a preferred embodiment, the current denitrification rate DN of the denitrification system rate This refers to the average denitrification rate over the current unit of time (e.g., 1 hour). For example, when NO is detected in flue gas during production... x When the concentration is abnormal, the average denitrification rate of the denitrification system is collected within the most recent unit time period (e.g., 1 hour) before the time of the abnormality. Specifically, historical denitrification data of the denitrification system within the current unit time period is collected, including inlet NO. x Concentration (i.e., the NO concentration corresponding to the sintering machine) x Emission concentration, i.e., NO produced from sintered ore x Emission concentration (C) and export NO x Concentration (i.e., NO in the denitrification system) x (Emission concentration), the unit for both concentrations here is mg / m³. 3It is understandable that there are multiple sets of historical denitrification data within a unit of time period, such as multiple monitoring of the aforementioned inlet NOx concentration and outlet NO. x Concentration, and the inlet NO measured each time. x Concentration and export NO x The concentration constitutes a set of historical denitrification data; for each set of historical denitrification data, the denitrification rate is the outlet NO. x relative concentration of NO at the inlet x The decrease in concentration and the inlet NO x The ratio of concentrations, i.e. (inlet NO) x Concentration - Export NO x Concentration) / Inlet NO x Concentration; furthermore, in this preferred embodiment, the current denitrification rate DN of the denitrification system rate This represents the average denitrification rate of multiple sets of historical denitrification data within the current unit time period. Therefore, in this preferred embodiment, the average denitrification rate within the current unit time period is used to characterize the current denitrification rate (DN). rate This can improve the accuracy of the entire control method and avoid NO at the outlet of the denitrification system. x Concentration and inlet NO x Occasional fluctuations in concentration can affect the accuracy of the control method results.

[0030] In addition, the current denitrification rate (DN) of the denitrification system is characterized by the average denitrification rate of multiple sets of historical denitrification data within the current unit time period. rate In this case, it is preferable to remove abnormal data from multiple sets of historical denitrification data, such as denitrification data during equipment maintenance.

[0031] In another preferred embodiment, the current denitrification rate DN of the denitrification system is... rate This is the average denitrification rate over a preset historical time period (e.g., any duration between 10 and 15 days). For example, when NO is detected in flue gas during production... x When the concentration is abnormal, the average denitrification rate of the denitrification system is collected within the most recent preset historical time period (e.g., 15 days) prior to the time of the abnormality. The specific calculation method for this average value is similar to that for the average denitrification rate within a unit time period (e.g., 1 hour) mentioned above, and those skilled in the art can deduce it without creative effort, so it will not be described in detail here.

[0032] Of course, in a variation of the implementation, the current denitrification rate DN of the denitrification system described in step S100 is... rate It can also be the data collected at the current moment (e.g., in the flue gas NO). x In application scenarios with abnormal concentrations, the NO concentration at the outlet of the denitrification system (i.e., the moment the abnormality occurs) is... x Concentration and inlet NO x The concentration data were obtained from a single set of data.

[0033] As is known in the art, or as can be seen from the above description, DN rate It is a pure decimal greater than 0 and less than 1.

[0034] Furthermore, in step S100, NO from the denitrification system is collected. x Emission concentration target threshold OUT NO The NOx emission concentration target threshold OUT NO Typically set to not exceed the industry NO. x Ultra-low emission standards.

[0035] Step S200: Based on the unit time fuel quantity F and unit time NO produced by sintered ore within a preset historical time period... x The emission concentration C was fitted to obtain the functional relationship 1, and the NO emission concentration per unit time was determined. x Equation 2 shows the functional relationship between emission concentration fluctuation C0 and fuel consumption per unit time F.

[0036]

[0037]

[0038] Specifically, the preset historical time period mentioned in this step is not less than the unit time period, and preferably can be an integer multiple of the unit time period. For example, if the unit time period is 1 hour, then the preset historical time period is not less than 120 hours, and can be any value in the range of 240h to 360h (e.g., 15 days).

[0039] Specifically, the historical sinter production data of the sintering machine for a preset historical time period is statistically analyzed, including: First, fuel consumption F per unit time, which can be in tons per hour (t / h); Second, NO per unit time. x Emission concentration C (i.e., NO from the sintering machine) x Emission concentration), in mg / m³ 3 Specifically, this can be achieved by monitoring the NO at the sintering machine outlet multiple times within a unit time period. x The concentration is obtained by averaging.

[0040] Furthermore, in step S200, the reference... Figure 1 Previously collected (e.g., in flue gas NO) x In application scenarios involving abnormal concentrations, the current moment (the moment the abnormality occurs) is used to calculate the fuel quantity F and NO content per unit time (e.g., every hour) within a preset historical time period (e.g., 15 days). x Emission concentration C constitutes a set of data, as shown in the example. Figure 1The data point P represents the total number of data points P within a historical time period. Next, curve fitting is performed on these data points P to obtain function equation 1, as shown below.

[0041]

[0042] It should be noted that the inventors' research has found that the amount of fuel affects the NO content in the flue gas at the sintering machine outlet. x The most important reason for the concentration, and the inventors also discovered, is the amount of fuel and the NO concentration in the flue gas at the sintering machine outlet. x The concentration exhibits a correlation as shown in Equation 1 above. Combined with... Figure 1 That is, when F≤F0, C fluctuates around a constant value C1, such as Figure 1 The solid line to the left of F0; when F > F0 + F1, C and F are linearly positively correlated, as shown in the figure. Figure 1 The solid line to the right of F0+F1 represents the condition; however, when F0<F≤F0+F1, 0≤F1≤2t / h, meaning that within a very small range above F0, C and F do not have a clear specific functional relationship. Figure 1 The middle mark indicates the transition zone.

[0043] In addition, when using these data points P to perform curve fitting to obtain the functional relationship 1, it is preferable to remove abnormal data points, such as data points during equipment maintenance.

[0044] Furthermore, in step S200, the reference... Figure 1 While performing curve fitting using these data points P, we can also determine NO per unit time. x The functional relationship between emission concentration fluctuation C0 and fuel consumption per unit time F is shown in Equation 2 below.

[0045]

[0046] Among them, NO per unit time x The emission concentration fluctuation C0 characterizes the NO emission rate per unit time within each preset time period (e.g., every hour). x The fluctuation range of emission concentration C, for example, when F≤F0, C0 takes the value C. 01 C is above or below the constant value C1. 01 Fluctuations within a range, such as Figure 1 The two dashed lines to the left of F0; when F > F0 + F1, C0 takes the value C. 02 C in Figure 1 The upper and lower C of the solid line to the right of F0+F1 (i.e., the C2+kF function line) 02 Fluctuations within a range, such as Figure 1 The two dashed lines to the right of F0+F1.

[0047] In addition, in determining the function relationship 2 by using the data points P, preferably, the abnormal data points (which can be understood as corresponding to the abnormal data points removed in determining the function relationship 1) such as the data points during equipment maintenance are removed. Furthermore, in determining the function relationship 2 by using the data points P, the determined value of C0 needs to cover more than 90% of all the effective data points (i.e. the remaining data points after removing the abnormal data points), that is, in the case of F0+F1, the total number of data points in the area between the upper and lower dashed lines on the left side of F0 is more than 90% of all the data points when F≤F0, and the total number of data points in the area between the upper and lower dashed lines on the right side of F0+F1 is more than 90% of all the data points when F>F0+F1. Figure 1 In the case of F0+F1, the total number of data points in the area between the upper and lower dashed lines on the right side of F0+F1 is more than 90% of all the data points when F>F0+F1. Figure 1 In the case of F0+F1, the total number of data points in the area between the upper and lower dashed lines on the right side of F0+F1 is more than 90% of all the data points when F>F0+F1.

[0048] Further, in the above formula 1 and formula 2, the units of C, C1, C2, C0, C 01 and C 02 are mg / m 3 , the units of F, F0 and F1 are t / h, and the unit of k is (mg·h) / (t·m 3 ). C1, C2, C 01 , C 02 , F0, F1 and k are all constants.

[0049] Step S300, compare the size relationship between IN NO and C1+C 01 ; that is, compare the calculated IN NO in step S100 with the constant C1+C 01 determined in step S200, and according to the comparison result, enter the subsequent step S400 or step S500.

[0050] Step S400, if the comparison result in step S300 is IN NO ≤C1+C 01 , then control the sintering production to stop and start the maintenance. In the present application, when IN NO ≤C1+C 01 , it is determined that the current denitration rate DN rate of the denitration system is too low to meet the preset emission requirement (for example, it cannot be stably maintained at the NO x emission concentration target threshold OUT NO and below), and if the production continues, there is a high risk of exceeding the OUT NO and being uncontrollable, so the sintering production is controlled to stop and the system is maintained.

[0051] Step S500, if the comparison result in step S300 is INNO >C1+C 01 , then according to the formula IN NO =C2+kxF+C 02 , the fuel amount F(IN NO ) per unit time is calculated, and the sintering production is continued with the obtained fuel amount F(IN NO ) per unit time.

[0052] Specifically, in the step S500, when IN NO >C1+C 01 , it is determined that the current denitration rate DN rate of the denitration system meets the production requirement, so that: first, the fuel amount F(IN NO ) per unit time is calculated according to the formula IN 02 =C2+kxF+C NO ; and then, the fuel amount for the sintering production is regulated, and the sintering production is continued with the obtained fuel amount F(IN NO ) per unit time. It should be noted that, although there is no obvious function relationship in the transition zone, the transition zone is very small (for example, only 0-2 t / h), so the fuel amount is regulated according to the function relationship 1 when F>F0+F1, which can also ensure the optimization of the production.

[0053] Of course, preferably, in the step S500, in addition to regulating the fuel amount, the sintered ore production sintering discharging amount F(IN NO ) / R is calculated according to the calculated fuel amount F(IN NO ) per unit time and the preset solid fuel ratio R; and the production is continued with the obtained sintered ore production sintering discharging amount F(IN NO ) / R. That is, the discharging amount of the sintering machine is also adjusted and optimized.

[0054] In this way, according to the regulation method of the present application, the flue gas NO x concentration in the sintering production can be stably maintained within the preset emission standard, thereby meeting the ultra-low emission requirement, especially in the case of abnormal flue gas NO x concentration (for example, sudden large increase or exceeding the emission standard), the flue gas NO x concentration in the sintering production can be restored to normal, or it can be screened whether the denitration system is abnormal, and more importantly, the sintered ore production can be considered, so that the sintered ore production is maximized, thereby avoiding the derived problems such as abnormal emission or too low production caused by blind reduction in the prior art.

[0055] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

[0056] The following experimental examples further illustrate the technical solution of the present invention. Of course, these experimental examples are only a preferred subset of the numerous variations contained in the present invention, and not all of them.

[0057] Experimental Example 1

[0058] NO was detected in the flue gas of the sintering machine during sintering production. x Emission concentration from 250 mg / m³ 3 Abnormally high to 350 mg / m³ 3 NO in flue gas from denitrification system x Emission concentration from 30 mg / m³ 3 Abnormally elevated to 47 mg / m³ 3 The growth rate has increased dramatically and is approaching the industry's ultra-low emission standard of 50mg / m³. 3 The assessment carries significant risk. In this situation, the regulatory process should be initiated:

[0059] 1) Collect the denitrification data of the denitrification system for the previous 15 days (i.e., 15 days backward from the time the anomaly was detected). After removing the abnormal data, calculate the average denitrification rate as 86.5%. Based on this, obtain the current denitrification rate DN. rate It was 86.5%; and, NO was collected. x Emission concentration target threshold OUT NO 38mg / m 3 (Specific settings will be made according to needs); based on formula IN NO =OUT NO ÷(1-DN rate ), calculate NO produced from sintered ore x Emission concentration target threshold IN NO 281 mg / m 3 .

[0060] 2) Compile historical sinter production data (including fuel quantity F and NO quantity per unit time) for the previous 15 days (i.e., 15 days backward from the time the anomaly was detected) of the sintering machine. x After removing outliers, the emission concentration C was fitted to obtain the functional relationship 1, and the NO emission concentration per unit time was determined. x Equation 2 shows the functional relationship between emission concentration fluctuation C0 and fuel consumption per unit time F.

[0061]

[0062]

[0063] wherein F0 is 21.0 t / h, F1 is 1.0 t / h, C1 is 238 mg / m 3 , C 01 is 60 mg / m 3 , C2 is 248 mg / m 3 , k is 0.95 (mg·h) / (t·m 3 ), C 02 is 82 mg / m 3 .

[0064] 3) Comparing the size of IN NO and C1+C 01 , it can be seen that IN NO ≤ C1+C 01 (i.e. 281 mg / m 3 < (238+60) mg / m 3 ), it is determined that the current denitration rate DN rate of the denitration system is too low to meet the preset emission requirement (e.g. cannot be stably maintained below 38 mg / m 3 ), the sintering production is controlled to be suspended and the maintenance is started.

[0065] Experimental Example 2

[0066] In the sintering production, the flue gas NO x emission concentration of the sintering machine is abnormally increased from 230 mg / m 3 to 310 mg / m 3 , the flue gas NO x emission concentration of the denitration system is abnormally increased from 30 mg / m 3 to 48 mg / m 3 , the growth rate is dramatically increased and close to the industrial ultra-low emission standard of 50 mg / m 3 , which has a great risk. In this case, the regulation process is started:

[0067] 1) The denitration data of the denitration system in the previous 15 days (i.e. starting from the time when the abnormality is monitored, backtracking 15 days) is counted, after excluding the abnormal data, the average denitration rate is calculated as 87.3%, from which the current denitration rate DN rate is 87.3%; and the NO x emission concentration target threshold OUT NO is 38 mg / m 3 (which is specifically set according to the need); according to the formula IN NO = OUT NO ÷(1-DN rate ), the NOx emission concentration threshold value IN NO is 299 mg / m 3 .

[0068] 2) Statistics of the historical sinter production data (including the fuel amount F per unit time and the NO x emission concentration C) of the sinter machine in the previous 15 days (i.e. starting from the moment when the anomaly is monitored, backtracking 15 days), after excluding abnormal data, the function relationship formula 1 is fitted, and the function relationship formula 2 of the NO x emission concentration fluctuation amount C0 and the fuel amount F per unit time is determined.

[0069]

[0070]

[0071] Wherein, F0 is 20.5 t / h, F1 is 1.0 t / h, C1 is 217 mg / m 3 , C 01 is 50 mg / m 3 , C2 is 201 mg / m 3 , k is 0.94 (mg·h) / (t·m 3 ), C 02 is 78 mg / m 3 .

[0072] 3) Compare the size of IN NO and C1+C 01 , it can be seen that IN NO >C1+C 01 (i.e. 299 mg / m 3 <(217+50) mg / m 3 ), then: according to the formula IN NO =C2+k×F+C 02 , calculate the fuel amount F per unit time (IN NO )=(299-201-78) mg / m 3 ÷0.94 (mg·h) / (t·m 3 )=21.3 t / h; and the preset solid fuel ratio R is 3.3%, calculate the sinter production sintering discharging amount F (IN NO ) / R is 645 t / h; next, control the sinter machine to carry out subsequent production of sinter according to the fuel amount per unit time 21.3 t / h, the discharging amount 645 t / h.

[0073] Finally, after adjustment, it is found that the NO x emission concentration of the sinter machine gradually decreases to 280 mg / m 3The flue gas NOx of the denitration system x The emission concentration gradually reduces to 38 mg / m 3 The following, and maintain stable.

Claims

1. A method for sinter production control based on flue gas NOx x concentration, characterized by The method comprises the steps of: Collect the current denitrification rate (DN) of the denitrification system rate and NO x Emission concentration target threshold OUT NO According to the formula IN NO =OUT NO ÷(1-DN rate ), calculate NO produced from sintered ore x Emission concentration target threshold IN NO ; According to the unit time fuel consumption F of sinter production and the unit time NO x emission concentration C in the preset historical time period, a function relationship formula 1 is fitted, and the unit time NO x emission concentration fluctuation amount C0 and the unit time fuel consumption F function relationship formula 2; Comparing IN NO and C1+C 01 for size. If IN NO ≤ C1 + C 01 , then control the sintering production to stop and start the maintenance; if IN NO > C1+C 01 , then the fuel quantity F(IN NO ) per unit time is calculated according to the formula IN 02 = C2+k×F+C NO , and the sintering production is continued with the obtained fuel quantity F(IN NO ) per unit time. The OUT NO , IN NO , C, C1, C2, C0, C 01 and C 02 are in mg / m 3 , the F, F0, F1 are in t / h, the k is in (mg·h) / (t·m 3 ), the C1, C2, C 01 , C 02 , F0, F1 and k are constants.

2. The flue gas NOx based process according to claim 1, wherein the NOx is selected from the group consisting of NO, NO2, N2O, N2O4, and mixtures thereof. x The sintering production control method at a high concentration, characterized by comprising the steps of: In step "if IN NO > C1+C 01 , then the fuel amount F(IN NO ) per unit time is calculated according to the formula IN 02 =C2+k×F+C NO , and the sintering production is continued with the resulting fuel amount F(IN NO ) per unit time. The method comprises the steps of: According to the formula IN NO = C2+ k x F + C 02 The fuel amount F(IN NO ) per unit time is calculated. According to the obtained fuel amount F(IN NO ) per unit time and the preset solid fuel ratio R, the sintered ore production sintered ore discharging amount F(IN NO ) / R is calculated. The control is made with the fuel quantity F(IN NO ) per unit of time obtained, the sintering feed quantity F(IN NO ) per unit of time and the ratio R.

3. The flue gas NOx based process according to claim 1, wherein the NOx concentration is in the range of 100- 1000 ppm. x The sintering production control method according to claim 1 or 2, characterized in that, The current denitration rate DN rate is the average value of the denitration rate in the current unit time period.

4. The flue gas NOx based process according to claim 1, wherein the NOx concentration is in the range of 100- 1000 ppm. x The sintering production control method according to claim 1, characterized in that, The current denitration rate DN rate is the average value of the denitration rate in the preset historical time period.

5. The flue gas NOx based process according to claim 1 or 4, wherein the process is a sintering production control method, characterized by, x the sintering production control method, characterized by, The step "determining the fuel consumption F per unit time for sinter production in a predetermined historical time period, and the NOx emission concentration C" in the predetermined historical time period, in units of 1 hour time period, is not less than 120 hours. x The step "determining the fuel consumption F per unit time for sinter production in a predetermined historical time period, and the NOx emission concentration C" in the predetermined historical time period, in units of 1 hour time period, is not less than 120 hours.

6. The flue gas-based NOx reduction system according to claim 5, wherein the NOx reduction system is a system according to any one of claims 1 to 4. x The sintering production control method according to claim 1 or 2, characterized in that, The preset historical time period is any value in the range of 240h-360h.

7. NO in flue gas during sintering production x The method for dealing with abnormal concentrations is characterized by, The method comprises the steps of: The method comprises the steps of: monitoring that the current NOx emission concentration of the de-NOx system reaches the NOx emission concentration target threshold OUT NO ; Collect the current denitrification rate (DN) of the denitrification system rate According to the formula IN NO =OUT NO ÷(1-DN rate ), calculate NO produced from sintered ore x Emission concentration target threshold IN NO ; According to the unit time fuel consumption F of sinter production and the unit time NO x emission concentration C in the preset historical time period, a function relationship formula 1 is fitted, and the unit time NO x emission concentration fluctuation amount C0 and the unit time fuel consumption F function relationship formula 2; Comparing IN NO and C1+C 01 for size. If IN NO ≤ C1 + C 01 , then control the sintering production to stop and start the overhaul; if IN NO > C1+C 01 , then the fuel quantity F(IN NO ) per unit time is calculated according to the formula IN 02 =C2+k×F+C NO , and the sintering production is continued with the obtained fuel quantity F(IN NO ) per unit time. The OUT NO , IN NO , C, C1, C2, C0, C 01 , and C 02 are in mg / m 3 , the F, F0, F1 are in t / h, and the k is in (mg·h) / (t·m 3 ). The C1, C2, C 01 , C 02 , F0, F1, and k are constants.

8. The sinter production flue gas NOx according to claim 7, wherein the NOx is reduced by 30% or more. x A method for coping with abnormality of concentration, characterized by, In the step "if IN NO > C1+C 01 , then the fuel quantity F(IN NO ) per unit time is calculated according to the formula IN 02 =C2+k×F+C NO , and the sintering production is continued with the resulting fuel quantity F(IN NO ) per unit time." According to the formula IN NO = C2+ k x F + C 02 The fuel amount F(IN NO ) per unit time is calculated. According to the obtained fuel amount F(IN NO ) per unit time and the preset solid fuel ratio R, the sintered ore production sintered ore discharging amount F(IN NO ) / R is calculated. The control is made with the fuel quantity F(IN NO ) per unit of time obtained, the sintering feed quantity F(IN NO ) / R continues to be produced.

9. The sinter production flue gas NOx according to claim 7, wherein the NOx is reduced by 30% or more. x Method for coping with abnormality of concentration, characterized by, The current denitration rate DN rate is the average value of the denitration rate in the preset historical time period; The step "determining the fuel consumption F per unit time for sinter production in a predetermined historical time period and the NOx emission concentration C" in the predetermined historical time period, and calculating the correlation between the fuel consumption F per unit time and the NOx emission concentration C" in the predetermined historical time period" is performed by the correlation calculation unit 20. x The predetermined historical time period is not less than 120 hours in the unit time period of 1 hour in the NOx emission concentration C".

Images