TWI688659B - Online real-time air leakage rate measuring device and measuring method for sintering process exhaust system - Google Patents

Abstract

The invention relates to an on-line real-time air leakage rate measuring device and measuring method for a sintering process exhaust system. The online real-time air leakage rate measuring device of the sintering process exhaust system includes a support frame, at least one protective sleeve and at least one anemometer. The at least one protective sleeve is connected to the support frame. The at least one anemometer has a sensor, and the sensor is disposed in the at least one protective sleeve.

Description

Online real-time air leakage rate measuring device and measuring method for sintering process exhaust system

The invention relates to an air leakage rate measuring device and a measuring method, and more specifically, to an online real-time air leakage rate measuring device and a measuring method of a sintering process exhaust system.

In the production process of sinter ore, the air leakage of the exhaust system of the sintering process has always been one of the problems that is difficult to solve completely. The air leakage mainly refers to that the air does not pass through the sintered material surface under the action of exhaust, but enters the main sinter exhaust through each leakage point The pipeline reduces the effective air flow through the sintered material layer, reduces the output of the sinter, affects the quality of the sinter and wastes a lot of electric energy (more than 50% of the energy consumption of the sintering site is charged on the windmill).

Therefore, if you can immediately monitor the changes in the air leakage of the exhaust system of the sintering process, it will help the maintenance personnel to take effective measures to repair and replace the equipment in a timely manner. According to the practical experience of the process, for every 1% reduction in air leakage, the power consumption per ton of sintered ore can be reduced by about 0.15kWh. Therefore, sintering sites at home and abroad continue to study and improve the reduction of sintering air leakage rate. At present, the leakage rate of the exhaust system of the sintering process of advanced steel mills in foreign countries (such as Japan, Germany, South Korea, etc.) is about 30-35%; while in mainland China, Baosteel is about 40%, Anshan Steel, Wuhan Steel and Shougang are about 45-50 %, other steel mills are about 50-60%.

The measurement method of the air leakage rate of the conventional exhaust system of the sintering process is as follows:

1. Balance calculation

In this method, the analysis results of flue gas components at the measurement points before and after the measured part are taken to calculate the air leakage rate. According to the change of the concentration of different components in the flue gas, find the relationship between the ratio of the front and back air volume and the change of the component concentration, and indirectly calculate the air leakage rate.

Disadvantages: At present, there are still problems such as large gas synchronous sampling workload, long measurement process time, complicated operation, large absolute error in the measurement results of each bellows, large gas analysis volume, and the inability to determine the specific air leakage position. Although this method is widely used, the gas analysis method is not suitable for long-term continuous detection because the measuring element is easily corroded by acid gas in the sintered exhaust gas.

2. Calorie method

This method assumes that there is a system where the heat of the gas entering the system is equal to the heat of the exhaust gas leaving the system plus the amount of change in system heat loss and heat storage. In addition, under normal and stable operating conditions, a heat balance type should be established assuming that the amount of change in heat storage is zero and the heat loss remains unchanged. Finally, the air leakage rate can be obtained by measuring the temperature.

Disadvantages: The data used in this method is too subjective, and the accuracy is poor, and it is susceptible to uncertain factors, so this method is only theoretically meaningful.

3. Sealing method

This method is to seal the gap between the trolley casters, drive the exhaust fans to adjust the negative pressure of each bellows during production, and consider the amount of air drawn by the fans as the amount of air leakage. The ratio of the amount of air leakage to the total amount of exhaust gas is the air leakage rate.

Disadvantages: This method is not easy to implement in production and must be shut down to affect normal production. Moreover, this method does not calculate the air leakage of the gap between the trolley wall and the crack of the material surface, resulting in poor accuracy when used in the field.

Based on the above analysis, it is necessary to provide an innovative and progressive sintering process exhaust system online real-time air leakage rate measurement device and measurement method to solve the above-mentioned lack of knowledge.

In one embodiment, an on-line real-time air leakage rate measuring device package for an exhaust system of a sintering process It includes a support frame, at least one protective sleeve and at least one anemometer. The at least one protective sleeve is connected to the support frame. The at least one anemometer has a sensor, and the sensor is disposed in the at least one protective sleeve.

In one embodiment, a method for measuring the online real-time air leakage rate of the sintering process exhaust system includes the following steps: providing an online real-time air leakage rate measuring device for the sintering process exhaust system, and measuring the online real-time air leakage rate of the sintering process exhaust system The device includes a support frame, a plurality of protection sleeves and a plurality of anemometers, the protection sleeves are connected to the support frame at intervals, each of the anemometers has a sensor, and each of the sensors is respectively arranged in each protection Inside the sleeve; span the support frame across a sintering bed material surface; use these wind speeds to measure the wind speed values at multiple locations of the sintering bed material surface; calculate the sintering material surface based on the wind speed values at these locations Average effective wind speed; use the sinter bed area and the average effective wind speed of the sintered material surface to calculate the average effective air intake of the sintered material surface; and use the average effective air intake of the sintered material surface to calculate the air leakage rate.

50: Online real-time air leakage rate measuring device for sintering process exhaust system

51: Support frame

52: Protection sleeve

53: Anemometer

53S: Sensor

54: connector

Ad: protection sleeve axial

D: Inner diameter of protective sleeve

k: wet material ratio

L: length of sensor

Ld: length direction of sensor

L1: Length of support frame

M: Ignition hood

S: sinter bed surface

S31~S36: Step

SG-1~SG-6: sintered cloth valve

W: width of sinter bed surface

WB-3~WB-16: Bellows

FIG. 1 shows a schematic structural diagram of an on-line real-time air leakage rate measuring device of the sintering process exhaust system of the present invention.

FIG. 2 shows a schematic diagram of the configuration of the anemometer and protective sleeve of the present invention.

FIG. 3 shows a flow chart of the on-line real-time air leakage measurement method of the sintering process extraction system of the present invention.

FIG. 4 shows a schematic diagram of measuring the effective air volume of the sintering bed material surface of the present invention.

Figure 5 shows a schematic diagram of the sintering reaction of the present invention.

Figure 6 shows the test results of the single anemometer of the present invention.

Fig. 7 shows the effect of the height of the distance from the material surface of the present invention on the measurement of the anemometer.

Figure 8 shows the handheld anemometer (close to the material surface) and online anemometer (not close to the material surface) of the present invention Comparison chart of measurement results.

FIG. 9 is a graph showing the relationship between the air leakage rate of the exhaust system of the sintering process of the present invention and the wet material ratio (k).

FIG. 10 shows the calculation results of the air leakage rate of the exhaust system of the sintering process of the present invention.

FIG. 11 shows the interface of the system for measuring the air leakage rate on the exhaust system of the sintering process of the present invention.

The drawings and the common reference numbers used herein indicate the same or similar components. The present invention will be more apparent from the following detailed description in conjunction with the accompanying drawings.

Referring to FIG. 1, it shows a schematic structural diagram of an on-line real-time air leakage rate measuring device of the sintering process exhaust system of the present invention. The on-line real-time air leakage rate measuring device 50 of the sintering process extraction system of the present invention includes a support frame 51, at least one protective sleeve 52 and at least one anemometer 53.

In this embodiment, the support frame 51 is a movable support frame. In one or more embodiments, the support frame 51 may be a fixed support frame.

The at least one protective sleeve 52 is connected to the support frame 51. In this embodiment, the at least one protective sleeve 52 is connected to the support frame 51 via a connecting member 54. In addition, the at least one protective sleeve 52 is an elastic protective sleeve to produce an anti-collision effect.

The at least one anemometer 53 has a sensor 53S disposed in the at least one protective sleeve 52, and one end of the at least one anemometer 53 is connected to the support frame 51. In this embodiment, the at least one anemometer 53 is a hot wire anemometer. The hot wire anemometer heats the metal wire with current, heats the flowing air, utilizes the heat dissipation rate and the square root of the wind speed to have a linear relationship and passes through the electronic circuit line. Sexualization is converted to wind speed readings. In addition, the hot wire anemometer has a temperature compensation range of 0°C to 60°C.

FIG. 2 shows a schematic diagram of the configuration of the anemometer and protective sleeve of the present invention. With reference to FIGS. 1 and 2, in order to improve the accuracy of the wind speed value measured by the sensor 53S of the at least one anemometer 53 In the embodiment, the length L of the sensor 53S is smaller than the inner diameter D of the at least one protection sleeve 52, and the length direction Ld of the sensor 53S is perpendicular to the axial direction of the at least one protection sleeve 52 Ad.

FIG. 3 shows a flow chart of the on-line real-time air leakage measurement method of the sintering process extraction system of the present invention. With reference to step S31 and FIG. 1 of FIG. 3, an online real-time air leakage rate measuring device 50 of the sintering process exhaust system is provided. The online real-time air leakage rate measuring device 50 of the sintering process exhaust system includes a support frame 51 and a plurality of protections Sleeve 52 and plural anemometers 53. In this embodiment, the support frame 51 is a movable support frame.

The protection sleeves 52 are connected to the support frame 51 at intervals, and preferably, each of the protection sleeves 52 is connected to the support frame 51 by a connecting member 54. In addition, the protective sleeves 52 are elastic protective sleeves to produce an anti-collision effect.

Each of the anemometers 53 has a sensor 53S, each of the sensors 53S is disposed in each of the protective sleeves 52, and one end of each of the anemometers 53 is connected to the support frame 51. In this embodiment, the anemometers 53 are hot-wire anemometers. The hot-wire anemometer heats the wire with electric current, heats the flowing air, utilizes the heat dissipation rate to be linearly related to the square root of the wind speed, and is linear through the electronic circuit. Turn into wind speed reading. In addition, the hot wire anemometer has a temperature compensation range of 0°C to 60°C.

1 and 2 again, in order to improve the accuracy of the wind speed value measured by each sensor 53S of each anemometer 53, in this embodiment, the length L of each sensor 53S is less than The inner diameter D of each protection sleeve 52 and the longitudinal direction Ld of each sensor 53S are perpendicular to the axial direction Ad of each protection sleeve 52.

FIG. 4 shows a schematic diagram of measuring the effective air volume of the sintering bed material surface of the present invention. Referring to step S32 of FIG. 3, FIG. 1 and FIG. 4, the support frame 51 is straddled over the material surface S of a sintering bed. In this step, the length L1 of the support frame 51 is greater than the width W of the material surface S of the sintering bed.

Referring to step S33 and FIG. 4 of FIG. 3, the complex of the material surface S of the sintering bed is measured by the anemometers 53 Wind speed values at several location points. In this step, the anemometers 53 move to measure the wind speed values at these points, and the anemometers 53 correspond to different numbers of wind boxes (WB-3~WB-16 in sequence) during the movement measurement ) To obtain the wind speed values on the material surfaces of the multiple bellows. In addition, the anemometers 53 respectively correspond to a sintered cloth valve (SG-1~SG-6).

In this embodiment, the six anemometers 53 are aligned with the lateral orientation of the No. 1-6 sintered cloth valve (SG-1~SG-6), and the No. 3-16 after the full measurement of the ignition cover M The longitudinal orientation of the air box (WB-3~WB-16) is to achieve the purpose of scanning the effective wind speed of the material surface S of the sintering bed.

Referring to step S34 of FIG. 3, the average effective wind speed of the sintered material surface is calculated according to the wind speed values at these positions. In this step, the average effective wind speed of the sintered material surface is the average value of the wind speed values at these positions.

Referring to step S35 of FIG. 3, the average effective air intake of the sintered material surface is calculated by using the sintered bed area and the average effective wind speed of the sintered material surface. In this step, the average effective air intake of the sintering material surface is the product of the area of the sintering bed and the average effective air velocity of the sintering material surface.

Referring to step S36 and FIG. 4 of FIG. 3, the air leakage rate is calculated using the average effective air intake of the sintered material surface. In this step, the air leakage rate is calculated as follows:

(A) Data collection: Collect (WB-3~WB-16) wind speed data on the azimuth surface of each wind box, a total of 14 wind boxes and 84 location points.

(B) The principle of mass balance: the sintering process draws air into the sintering material layer through an exhaust fan, and uses the oxygen in the air to burn with the carbon in the mixture, generating heat to cause a physical and chemical reaction inside the sintering material, thereby burning the mixture The process of agglomeration. Blower drawn into the total air volume in large flue (V _total) is composed of three parts: (1) enters the effective air volume of the sinter bed (V _feed); harmful leakage quantity (2) sintering system (V _drain) ; (3) The additional amount of gas (V _amount ) added by the physical and chemical reaction of the material layer during the sintering process. The additional amount of gas is the amount of water vapor in the mixture that changes from liquid to gaseous state, and the difference between the amount of gas generated by the chemical reaction and the amount of gas consumed. The chemical reaction consumes O ₂ in the air, and produces CO, CO ₂ and a very small amount of SO ₂ and other gases. The following gas reactions occur during the sintering process: C+O ₂ =CO ₂

2C+O ₂ = 2CO

C+CO ₂ = 2CO

S+O ₂ =SO ₂

As can be seen from the above reaction formula, the production of 1 mole of CO ₂ and 1 mole of SO ₂ each consumes 1 mole of O ₂ ; while the production of 1 mole of CO consumes 1/2 mole of O ₂ . Under the same pressure and temperature conditions, the gas mass is proportional to the volume, that is, the additional gas volume through the chemical reaction is 1/2 of the volume of CO in the exhaust gas in the large flue, that is, V _amount = 1/2 V _CO + V _{H2O (gas)} . However, through the detection of flue gas composition, it is found that the volume content of CO in flue gas is about 0.16%-0.32%, so the additional amount of gas through the chemical reaction accounts for about 0.08%-0.16% of the flue gas volume, and the content is very small , So part of the gas volume can be ignored. However, the volume of the water in the mixture turned into water vapor is about 10% of the volume of the flue gas. If the gas volume in this part is large, it cannot be ignored, that is, the _{amount of} V = V _{H2O (gas)} .

(C) Estimation of the amount of water vapor: The amount of water in the mixture that turns into water vapor is calculated by measuring the bulk density of the mixture and the moisture content between the particles of the mixture. The present invention considers the actual sintering process. It is believed that when the moisture between the particles in the mixture is 100°C, it can be completely evaporated into water vapor. However, the reaction temperature in the actual sintering process is far more than 100°C, so the crystal water in the particles in the mixture The ratio should also completely evaporate, so the present invention additionally adds the crystallization water ratio to estimate a more complete amount of water vapor to avoid underestimation. The water content of the mixture in the unit time is as follows (1):

The volume of water vapor V _{H2O in} the standard state per unit time is _marked as:

In formula (1) and formula (2), n _H2O is the water content in the mixture per unit time (unit: mole/s), λ is the bulk density of the mixture (unit: kg/m ³ ), and α is Moisture content between particles in the mixture (unit: %), β is the ratio of crystalline water in the mixture (unit: %), W is the width of the trolley (unit: m), H is the height of the layer (unit: m) ), v is the moving speed of the trolley (unit: m/s).

Refer to FIG. 5, which shows a schematic diagram of the sintering reaction of the present invention. In this embodiment, the present invention also considers the actual operation of the sintering process. When the entire bed body undergoes a sintering reaction, some of the mixture is still wet, as shown in FIG. 5, so it is assumed that the volume of the entire bed body is at the material surface. When the wind speed is measured, if there is still k% of wet material, its formula (2) should be modified as follows (3):

(D) Calculation of the air leakage rate of the sintering system: Since the effective air entering the sintering material surface is different from the wind in the large flue, before calculating the air leakage rate, it must be converted to the same standard state for comparison calculation. According to the ideal gas formula PV=nRT, we can see that PV/T=nR is a constant, then the air flow calculation formula under the standard state of each part is as follows:

(i) The average effective air intake V _{in the} sintered surface under standard conditions _{, standard} :

In formula (4), V _inlet is the average effective air inlet volume (unit: m ³ /s) during operation, P ₁ is atmospheric pressure during operation (unit: Pa), and T ₁ is atmospheric temperature during operation (unit: K ), the _subscript T is a standard condition atmosphere temperature (unit: K), P state _marked as standard atmospheric pressure (unit: Pa).

(ii) In the standard state, the total air volume V in the large flue _{, standard} :

Where V is the total air volume of the _total flue large operation: when (in m ³ / s), P ₂ as large flue operation pressure (unit: Pa), T ₂ is large flue temperature (unit operation : K), the _subscript T standard state air temperature (unit: K), atmospheric pressure (in the standard state _subscript P: Pa).

(iii) Air leakage rate SLR:

In formula (6), the _total V is _marked as the total air volume in the large flue in the standard state, the V _{inlet is marked} as the average effective air volume of the sintered surface in the standard state, and the V _H2O is the volume of water vapor in the standard state per unit time .

The following examples illustrate the invention in detail, but it does not mean that the invention is limited to what is disclosed by these examples.

[Test result of single anemometer]

Figure 6 shows the test results of the single anemometer of the present invention. With reference to Figures 4 and 6, first fix a single hot-wire anemometer to the sintering machine flybridge, at the position of the No. 10 wind box (Windbox-10, WB-10), about 5 cm away from the sintering surface, right The quasi-sixth sintering distribution valve (Subgate-6, SG-6) is used to measure the air speed of the material surface. The test process is divided into two stages. The first stage is the measurement performed under normal operation. The results are shown in the more stable curve in Figure 6. The wind speed value is within 0.2-0.3m/s. In the second stage, the sixth sintering cloth valve was temporarily closed to measure the conditions of the material surface vacancy and the incomplete combustion of the igniter. The results are shown in the curve of the high and low fluctuations in Figure 6 with a wind speed value of 0.4 -1.2m/s, this is due to incomplete combustion of sintered raw materials, raw clinker mixing and uneven material surface, the air passes through the looser and more irregular bed, so the instability of the material surface wind speed .

As can be seen from the above, the sensitivity and stability of the hot wire anemometer selected in the present invention are suitable for measuring the wind speed of the material surface. In addition, in order to verify that this type of anemometer is sufficient to withstand the high temperature and high powder of the sinter field In the dusty atmospheric environment, the present invention placed this single anemometer on the flyover for about four months, and found that the stability of wind speed measurement value and data transmission are not affected, and it also shows that the hot wire anemometer has sufficient Weather resistance.

[Test results of 6 anemometers]

(A) The effect of the height of the protective cover and the anemometer from the material surface on the measurement result:

Fig. 7 shows the effect of the height of the distance from the material surface of the present invention on the measurement of the anemometer. With reference to FIGS. 4 and 7, the present invention uses an anemometer equipped with a protective sleeve to measure from the material surface of the third wind box (WB-3) to the third along the longitudinal direction of the third sintering cloth valve (SG-3) 16 bellows (WB-16) material surface, the test results are shown in Figure 7. The sensor of the anemometer of the present invention is surrounded by a protective sleeve, and is not affected by the external environment airflow. The test results show that the anemometer is within 15 cm from the material surface, and has little effect on the measurement result of the anemometer.

Refer to FIG. 8, which is a comparison chart showing the measurement results of the handheld anemometer (close to the material surface) and the online anemometer (not close to the material surface) of the present invention. Comparison of the measurement results in Fig. 8 shows that, except for the large difference between the head and tail of the sintered material bed, the error value in the middle section of the material bed should be within the acceptable range. This phenomenon should also be related to the irregularity that most of the sintering process is still wet material and the sintering cake shrinkage phenomenon in the later stage, and the middle position of the sintering bed surface has a stable wind speed with relatively little effect on the distance between the material surfaces.

(B) Online wind speed measurement results:

Refer to Table 1 below, which shows the average measurement value and trend change of 84 positions of the six anemometers scanning the material surface of the sintering bed in the present invention. According to the average wind speed of each wind box in Table 1, the effective wind speed of the sintering material bed at both ends of the sintering material bed is relatively large, and the average wind speed at the middle section is relatively small, especially at the head and tail ends of the sintering material bed. The wind speed near the side plate of the trolley is relatively large, and this result is consistent with the results published by the Steel Research Center of the Ranchi Steel Plant in India.

[Calculation result of air leakage rate of sintering machine]

According to the calculation method of the air leakage rate of the present invention, the average effective wind speed of the sintered material surface can be obtained as 0.398 m/s, converted into the average effective air intake of the sintered material surface as 451650 m ³ /hr. At that time, the average temperature in the flue was 142.5°C, the average wind speed was 12.23m/s, the cross-sectional area of the flue was 25.44m ² , and the total air volume in the flue was 803609m ³ /hr. In terms of water vapor volume estimation, based on the raw material moisture content (7.2%), raw material crystallization water ratio (7.97%), raw meal bulk density (1920kg/m ³ ), trolley width (4.5m), and bed height (0.7 m), the trolley speed (0.031m/s), and the present invention assumes that the wet material ratio (k) of the mixture is substituted into equation (3), and the relationship between the water vapor volume and the wet material ratio (k), and then the smoke Substituting the total air volume of the channel and the average effective air volume of the sintered material into equation (6), the relationship between the air leakage rate of the exhaust system of the sintering process and the wet material ratio (k) can be obtained.

FIG. 9 is a graph showing the relationship between the air leakage rate of the exhaust system of the sintering process of the present invention and the wet material ratio (k). FIG. 10 shows the calculation results of the air leakage rate of the exhaust system of the sintering process of the present invention. With reference to Figure 9 and Figure 10, as the wet material ratio increases, the air leakage rate will increase slightly (as shown in Figure 9), when the wet material ratio is 50%, the water vapor volume is 65116m ³ /hr., sintering The air leakage rate of the process extraction system is 38.8%, as shown in Figure 10.

[Establishment of online air leakage rate measurement system]

Referring to FIG. 11, it shows the interface of the air leakage rate measurement system on the sintering process extraction system of the present invention. The invention can be written through a man-machine interface to establish an online air leakage rate measurement system for the sintering process exhaust system (as shown in FIG. 11). However, the effective wind speed measurement of the position set by the anemometer may still be affected by the air leakage of the bellows below or the difference in the distribution scheme. Therefore, the instant correction parameters of the present invention can be corrected by regular online scanning measurement.

The measuring device of the invention can obtain the wind speed of the same lateral position at the same time, and can reduce the influence of the airflow fluctuation of the material surface, and increase the measurement accuracy. The measurement method of the invention can achieve the effects of online continuous monitoring and simple, rapid and accurate operation, and the calculation of the air leakage rate also takes into account the fact that some of the mixture is still wet in the actual sintering process, and the accuracy is greatly improved.

The above-mentioned embodiments are only to illustrate the principles and effects of the present invention, but not to limit the present invention. Therefore, those skilled in the art may modify and change the above embodiments without departing from the spirit of the present invention. The scope of the rights of the present invention shall be as listed in the patent application scope described later.

50‧‧‧Online real-time air leakage rate measuring device for sintering process exhaust system

51‧‧‧Support frame

52‧‧‧Protection sleeve

53‧‧‧Anemometer

53S‧‧‧Sensor

54‧‧‧Connector

Claims (17)

A method for measuring the on-line real-time air leakage rate of the sintering process exhaust system includes the following steps: (a) providing an on-line real-time air leakage rate measuring device for the sintering process exhaust system. The on-line real-time air leakage rate measuring device for the sintering process exhaust system includes A support frame, a plurality of protection sleeves and a plurality of anemometers, the protection sleeves are connected to the support frame at intervals, one end of each anemometer is connected to the support frame, each of the anemometer has a sensor, each The sensors are respectively arranged in each of the protective sleeves; (b) the support frame is straddled over a sinter bed material surface; (c) the wind speed is used to measure a plurality of position points of the sinter bed material surface The wind speed value of (d) Calculate the average effective wind speed of the sintered material surface based on the wind speed values of these locations, the average effective wind speed of the sintered material surface is the average of the wind speed values of these locations; (e) use the sinter bed The area and the average effective wind speed of the sintered material surface are used to calculate the average effective air intake of the sintered material surface; and (f) The average effective air intake of the sintered material surface is used to calculate the air leakage rate. For example, the method for measuring the on-line real-time air leakage rate of the sintering process extraction system of claim 1, wherein the support frame in step (a) is a movable support frame. As in the method for measuring the on-line real-time air leakage rate of the sintering process extraction system of claim 1, each of the protection sleeves in step (a) is connected to the support frame by a connecting member. For example, the method for measuring the instantaneous air leakage rate of the sintering process exhaust system of claim 1 The protective sleeves in step (a) are elastic protective sleeves. As in the method for measuring the on-line instantaneous air leakage rate of the sintering process extraction system of claim 1, wherein the length of each sensor in step (a) is smaller than the inner diameter of each protection sleeve. As in the method for measuring the on-line air leakage rate of the sintering process extraction system of claim 1, wherein the length direction of each sensor in step (a) is perpendicular to the axial direction of each protection sleeve. For example, the method for measuring the on-line real-time air leakage rate of the sintering process extraction system of claim 1, wherein the anemometers in step (a) are hot wire anemometers. For example, the method of measuring the real-time air leakage rate of the sintering process exhaust system of claim 7, wherein the hot wire anemometer heats the metal wire with current, heats the flowing air, uses the heat dissipation rate and the square root of the wind speed to have a linear relationship and linear through the electronic circuit Turn into wind speed reading. For example, the method for measuring the on-line instantaneous air leakage rate of the sintering process extraction system of claim 7, wherein the hot wire anemometer has a temperature compensation range of 0°C to 60°C. For example, in the method for measuring the on-line air leakage rate of the sintering process extraction system of claim 1, wherein the length of the support frame in step (b) is greater than the width of the material surface of the sintering bed. For example, the method for measuring the on-line real-time air leakage rate of the sintering process exhaust system of claim 1, wherein the anemometers in step (c) respectively correspond to a sintering cloth valve. For example, the method for measuring the on-line real-time air leakage rate of the sintering process extraction system of claim 1, wherein the anemometers in step (c) move to measure the wind speed values at the location points. For example, the online real-time air leakage rate measurement method of the sintering process extraction system of claim 12, wherein the anemometers correspond to different numbers of wind boxes in sequence during the moving measurement process, so as to obtain the wind speed on the surface of the multiple wind box positions value. For example, the method for measuring the on-line real-time air leakage rate of the sintering process extraction system of claim 1, wherein the calculation formula of the air leakage rate in step (f) is as follows:

In the formula, SLR is the air leakage rate, V _{total, marked} as the total air flow in the large flue in the standard state, V _{inlet, marked} as the average effective air intake of the sintered material surface in the standard state, V _{H2O, marked} as the water vapor in the standard state per unit time volume of. For example, the measurement method of the instantaneous air leakage rate on the line of the sintering process extraction system of claim 14, in which the volume of water vapor in the standard state per unit time V _{H2O, the standard} calculation formula is as follows: V _{H2O, standard} = (100-k)×22.4× n _H2O

Where k is the wet material ratio, n _H2O is the water content of the mixture in unit time (unit: mole/s), λ is the bulk density of the mixture (unit: kg/m ³ ), and α is the mixture The moisture content between the particles (unit: %), β is the ratio of crystalline water in the mixture (unit: %), W is the width of the trolley (unit: m), H is the height of the layer (unit: m), v The moving speed of the trolley (unit: m/s). For example, the measurement method of the on-line real-time air leakage rate of the sintering process extraction system of claim 14, in which the average effective air intake V of the sintered material surface in the standard state _{, the standard} calculation formula is as follows:

Wherein V _feed is the frit surface average effective intake air volume during operation: when (in m ³ / s), P ₁ is operating atmospheric pressure (unit: Pa), T ₁ is operating air temperature (unit: K), T _{It is marked} as atmospheric temperature (unit: K) in the standard state, and P is _marked as atmospheric pressure (unit: Pa) in the standard state. For example, the measurement method of the on-line real-time air leakage rate of the sintering process exhaust system of claim 14, in which the total air volume V in the large flue under standard conditions _{, the standard} calculation formula is as follows:

In formula (5), V is _{always the} total air volume in the large flue during operation (unit: m ³ /s), P ₂ is the pressure in the large flue during operation (unit: Pa), and T ₂ is the large flue during operation temperature (unit: K), the _subscript T standard state air temperature (unit: K), atmospheric pressure P _labeled standard conditions (unit: Pa).

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