TWI424138B - Sintering trouble leak detection system and its detection method - Google Patents

Description

Sintering trolley leak detection system and detection method thereof

The invention relates to a gas leakage detecting system and a detecting method thereof, and more particularly to a sintering trolley gas leakage detecting system and a detecting method thereof.

The general ironworks is mainly responsible for the supply of molten iron required for steelmaking operations, while the ironmaking raw materials required for blast furnace ironmaking, such as coke and sinter, are supplied by coke ovens and sintering machines, respectively. Among them, the sintering workshop produces sinter as raw material for blast furnace ironmaking, and its main process is to use various materials such as Iron Ore, flux (Flux, such as limestone, etc.) and Coke Breeze. After setting the proportioning ingredients, the granules are mixed with water and stirred for granulation, and sent to a sintering machine for calcination. After the sintered sinter is crushed and sieved, the sinter with a particle size of 5~50 mm is sent to the sinter. The blast furnace is used as the main raw material for iron making.

One of the important indicators for detecting the quality of sintering during sintering is sintering gas permeability (JPU). The gas permeability of the Raw Mix is greatly affected by the particle size of the ore. Generally, the ore of the fine grain has poor gas permeability, so it is necessary to mix the ore with coarser particles to increase the void ratio to improve it. In addition, in addition to the influence of the particle size distribution of the raw material on the gas permeability of the mixture, the addition of moisture to the mixture and the promotion of the balling effect by the surface tension of the water can also improve the gas permeability.

Generally, the particle size of the raw material in the dry state is called the true particle size, and the particle size after adding the water and stirring and granulating is called Pseudo-Particle. The pseudo-like particles are mainly particles formed by fine-grained ore (less than 0.25 mm) attached to the core particles (1 to 5 mm), and particles with a general particle size of 0.25 to 1.0 mm are not easily granulated into pseudo-particles. Therefore, if some granulating agent (such as calcined lime powder) is added, it helps the ore to adhere to the core particles to form pseudo-particles. The gas permeability (JPU) of the mixture is as shown in the following equation: Where: F: ventilation amount (m ^{3 /} min.); A: suction area (m ² ); h: material layer thickness (m); S: extraction pressure (m. H ₂ O).

It can be seen from the above formula that the ventilation amount is positively related to the gas permeability. Therefore, when the sintering machine trolley leaks, the ventilation amount will be reduced, which directly causes the particles to be difficult to form, reduces the sinter output, and causes waste of energy.

The structure of the sintering machine is composed of a plurality of sintering trolleys. The sealing device at the front and the rear of each car is connected with the bottom of the trolley beam and the side of the bellows. The metal plate is in contact with the hard plate and needs to be left in the sintering process. A certain expansion space, at the same time, needs to be rubbed against the sharp sinter, thus causing scratches and grooves. Therefore, under the design of the conventional mechanism, the use of the sintering trolley does not take long to cause air leakage, so the inspection and exhaust system is an important item for each maintenance of the sintering plant.

In the prior art, it is detected by the personnel detection method during the operation of the sintering machine, so the personnel are exposed to high dust for a long time (for example, the sintering machine takes 60 to 70 minutes for one cycle) and high noise (about 85 to 95 decibels). Under the environment, using the human eyesight and hearing judgment, it is impossible to achieve the quantitative and positioning analysis of the trolley leakage. Therefore, the leakage detection rate of the conventional leak detection technology is low, and the personnel are seriously exposed to dust during the air leakage detection process. And the danger of noise.

In addition, the conventional leak detection technology focuses on the detection method based on the chemical reaction of the sintering process, which can be divided into four methods: flow method, sealing method, heat balance method and gas leakage analysis method. Among them, the flow method, the sealing method and the heat balance method lack reliable testing tools, so it is impossible to detect in actual conditions; and the air leak analysis method measures the same part in the sintering process, and compares the leaks of the first measurement and the subsequent measurement. According to the results of component analysis, the air leakage rate is calculated based on the material balance point of view, and the equilibrium equation is listed according to the change of the concentration of different components in the air leakage to obtain the relationship between the ratio of the front and rear air volume and the change of the component concentration, thereby indirectly calculating the leakage. Gas rate. However, none of the above conventional leak detection methods can achieve the effect of automatically detecting the leaking and leaking positioning of the sintering machine trolley.

Therefore, it is necessary to provide an innovative and progressive sintering trolley leak detection system and its detection method to solve the above problems.

The invention provides a sintering trolley air leakage detecting method, which comprises the following steps: (a) setting a preset resolution; (b) capturing a plurality of sound signals at the preset resolution; and (c) obtaining a sound signal according to a transmission signal. An interval information, wherein at least one radio frequency identification system (RFID) tag is disposed in at least one of a plurality of sintering trolleys, the RFID tag is configured to generate the transmitting signal; and (d) according to the interval Information, the sound signals and a set sound pressure value, calculate and judge the position of the gas leakage of the sintering trolley.

The invention further provides a sintering trolley air leakage detecting system, comprising: at least one RFID tag, at least one audio signal capturing unit, and a wireless receiving list Yuan and a data processing unit. The RFID tag is disposed on at least one of the plurality of sintering trolleys for generating a transmission signal. The sound signal capturing unit approaches the sintering trolleys and captures a plurality of sound signals at a predetermined resolution. The wireless receiving unit receives the transmitted signal to generate an interval signal. The data processing unit is configured to calculate and determine the position of the sintering trolley in which the air leak occurs based on the audio signal, the interval signal, and a set sound pressure value.

The sintering trolley air leakage detecting system and the detecting method thereof are combined with the sound signal analysis and the RFID technology to automatically detect the air leakage phenomenon and the occurrence position of the sintering trolleys, and provide the operation and maintenance personnel to instantly understand the air leakage occurrence. The position, as the basis for the repair of the sintering equipment, to repair the sintering equipment in a timely manner, so that the gas leakage phenomenon during the sintering process can be improved, and the sinter production capacity and quality can be improved. Furthermore, the sintering trolley air leakage detecting system and the detecting method thereof of the invention do not require personnel to perform detection during the operation of the sintering device, so the personnel are not exposed to dust and noise.

Fig. 1 is a schematic view showing the application of the sintering trolley gas leakage detecting system of the present invention to a sintering process. The sintering trolley air leakage detecting system 1 includes: at least one radio frequency identification system (RFID) tag 11, at least one audio signal capturing unit 12, a wireless receiving unit 13, a filtering unit 14, and a data processing Unit 15.

The sintering trolley air leak detection system 1 can have at least one RFID tag, wherein the RFID tag is disposed in at least one of a plurality of sintering trolleys for generating a transmission signal. In this embodiment, the sintering trolley leak detection The measurement system 1 has a plurality of RFID tags 11 disposed on each of the sintering carriages 16, and the sintering carriages 16 are moved along a track 17 of a sintering machine.

Referring to Figure 2, there is shown a schematic diagram of an RFID tag of the present invention. The RFID tag 11 is preferably an RFID tag using a single-polarized antenna. The RFID tag 11 using a single-polarized antenna includes a metal plate 111, an antenna structure 112, and an RFID chip 113. The antenna structure 112 is electrically connected to the metal plate 111. In this embodiment, the metal plate 111 has a first side edge 114 and a second side edge 115. The second side edge 115 is opposite to the first side edge 114. The antenna structure 112 is disposed on the metal plate. The first side 114 of the 111. The antenna structure 112 is electrically connected to the metal plate 111. It is to be noted that in other applications, the antenna structure 112 can be disposed in the middle portion of the metal plate 111.

The two ends of the RFID chip 113 are electrically connected to the antenna structure 112 such that the RFID chip 113, the antenna structure 112 and the metal plate 111 form a loop structure 116. In this embodiment, one of the reference planes 117 (shown by the dashed line) of the antenna structure 112 forms an angle θ ₁ with an extension plane 118 (shown by a broken line). The extending plane 118 is a plane extending from the first side 114 in a first direction, and the first direction is the direction of the second side 115 toward the first side 114.

In this embodiment, the antenna structure 112 further includes an extended metal piece 119 electrically connected to the circuit structure 116. The extended metal piece 119 has the functions of impedance matching and antenna gain.

In this embodiment, the RFID tag 11 using the single-polarized antenna has an electromagnetic wave emission direction, and the electromagnetic wave emission direction is changed according to the angle θ ₁ to have a larger readable distance, and the metal plate 111 is used. The angle θ _{1 of} the antenna structure 112 can adjust the direction of electromagnetic wave emission, so that the signal reading is easy and the recognition ability is better.

Referring to FIG. 1 , the sintering trolley air leakage detecting system 1 can have at least one sound signal capturing unit, wherein the sound signal capturing unit is disposed adjacent to one of the opposite sides and the top surface of the sintering trolley 16 . . In this embodiment, the sintering trolley air leakage detecting system 1 has a plurality of sound signal capturing units 12, and the sound signal capturing units 12 are respectively fixed on a support frame 18 supporting the wireless receiving unit 13 and located therein. And a top plate 19 above the sintering trolley 16 , wherein the support frame 18 is disposed adjacent to opposite sides of the sintering trolleys 16 (ie, the sound signal capturing units 12 are close to the sintering trolleys 16 Two opposite sides and a top surface), a plurality of sound signals are captured at a preset resolution. Preferably, the audio signal capturing unit 12 is a sound pressure microphone.

The wireless receiving unit 13 (for example, a labeling machine) is fixed to the supporting frame 18 and adjacent to the sintering trolley 16 for receiving the transmitting signal of the RFID tag 11 to generate an interval signal. The filtering unit 14 receives the audio signals from the audio signal capturing units 12 and filters the audio signals. In this embodiment, the filtering unit 14 is a high-pass filter, wherein the high-pass filter filters signals having a frequency lower than 20 Hz in the audio signals.

The data processing unit 15 receives the interval signal to obtain an interval information, and accepts the filtered audio signals and calculates the signal strength thereof, and Based on the signal strength and the interval information, the position of the sintering trolley 16 where air leakage occurs is calculated and judged. Preferably, the data processing unit 15 is a computer.

The preset resolution may be set according to the arrangement of the RFID tags 11, but is not limited to being set according to the configuration of the RFID tags 11. In this embodiment, each of the sintering carts is provided with an RFID tag 11, and the interval information is the distance between the RFID tags 11 of the RFID tags 11 (for example, adjacent RFID tags) and the movement of the sintering trolleys 16 The time of the separation distance. Each of the sintering carts 16 is provided with an RFID tag 11 respectively, the interval information can display the relative positions of the sintering carts 16 corresponding to the RFID tags 11, and the wireless receiving unit 13 can receive the RFID tags 11 The second RFID tag 11 transmits the signal and obtains a unit time of the vehicle, wherein the unit time of the vehicle is the time required for the sintering trolley to pass the distance of the sintering trolley. The unit time of the vehicle can be used as a reference for setting the preset resolution, and the sound pressure rms value and the position of the sintering trolley 16 where the air leakage occurs are calculated.

It should be noted that if the sintering trolley air leakage detecting system 1 has only one RFID tag, and the RFID tag is used as the starting point induction of the sintering trolleys 16, the interval information indicates that the sintering trolleys are operated for one cycle. The distance and movement time of the RFID tag. In addition, in the actual sintering process, since the speeds of the sintering trolleys 16 are controlled within a set range, the speeds of the sintering trolleys 16 may not coincide during an operation cycle, and therefore the sintering trolleys 16 are required to pass through in one operation cycle. The distance passed, divided by the time of the cycle, to obtain the average speed of the sintering trolleys 16, Combined with the sintering history time, the total distance traveled by the sintering process is calculated, and the root mean square value of the sound pressure is calculated according to the preset resolution set by the user (set according to different requirements, for example, 0.1 second to 1.0 second). The position of the sintering trolley 16 corresponding to the leaking air pressure corresponding to the root mean square value of the sound pressure is determined.

Fig. 3 is a flow chart showing the method for detecting the gas leakage of the sintering trolley of the present invention. In the present embodiment, the sintering trolley air leak detecting system 1 has a plurality of RFID tags 11 disposed on each of the sintering carts 16, respectively.

Referring to FIG. 1 and FIG. 3, first, with reference to step S31, a preset resolution is set. The preset resolution may be set according to the configuration of the RFID tags 11 (for example, every 0.1 second to 1 second or the trolley unit time), and the preset resolution setting method has been described in detail as before. Repeat them.

Referring to step S32, a plurality of audio signals are captured at the preset resolution. In this embodiment, the wireless receiving unit 13 receives the transmitting signals of the RFID tags 11 and utilizes the audio signal capturing units 12 that are adjacent to the opposite sides and the top surface of the sintering carriages 16 (Sound pressure microphone) captures the sound signals.

Referring to step S33, an interval information is obtained according to the transmission signals of the RFID tags 11. The interval information is the interval between the RFID tags 11 of the RFID tags 11 and the time when the sintering carts 16 move the separation distance. Step S33 further includes a filtering step of filtering the audio signals by the filtering unit 14. Preferably, in the filtering step, the audio signals are filtered by a high-pass filter to filter signals having frequencies below 20 Hz in the audio signals.

Referring to step S34, the signal strengths of the audio signals are calculated. In this reality In the example, it calculates the root mean square value of the audio signals. Among them, according to the actual measurement results, when one of the sintering trolleys leaks, broadband noise of more than 20 Hz is generated, and the background noise frequency in the general sintering process is below 20 Hz. Therefore, the filtering unit 14 (high-pass filter) is used to filter the signals whose frequencies are lower than 20 Hz in the audio signals, and then calculate the root mean square value of the audio signals (sound pressure signals).

Wherein, the present invention may also select one of the RFID tags 11 disposed on the sintering trolleys to serve as a starting and ending point of the sensing measurement, perform a plurality of operation cycles, and transmit the filtered audio signals. The data processing unit 15 is configured to calculate a root mean square value (the signal strength) of the filtered audio signals.

Referring to step S35, the position of the gas leakage of the sintering trolley is calculated and judged. If at least one of the signal strengths is greater than a set sound pressure value, the sound signal and the interval information whose intensity is greater than the set sound pressure value are used to calculate and determine the position of the gas leakage of the sintering trolley. In this embodiment, the set sound pressure value is set to a sound pressure root mean square value greater than 0.5 Pa (Pa).

Fig. 4 is a graph showing the rms value of the sound signal of the sintering trolley leak detection using the sintering trolley gas leakage detecting system of the present invention in a plurality of operation cycles. Curves L1 to L10 respectively show changes in the rms value of the sound signal in each operation cycle, wherein the curves L1 to L10 are at a position of 10 meters (derived from the interval information obtained by the transmitted signals of the RFID tags 11) A singular peak occurs (the rms value of the sound pressure is greater than 0.5 Pa), that is, the gas leakage of the sintering trolley occurs at a position of 10 meters. Therefore, according to the change of the rms value of the sound signals, the leakage of the sintering trolley can be quickly and clearly detected. The image and its location.

The sintering trolley air leakage detecting system and the detecting method thereof of the invention are combined with the sound signal (noise) analysis and the RFID technology to automatically detect the air leakage phenomenon and the occurrence position of the sintering trolleys, and provide an immediate understanding of the operation and maintenance personnel. The position where the air leakage occurs is used as the basis for the repair of the sintering equipment to repair the sintering equipment in a timely manner, so that the air leakage phenomenon during the sintering process can be improved, and the sinter production capacity and quality can be improved. Furthermore, the sintering trolley air leakage detecting system and the detecting method thereof of the invention do not require personnel to perform detection during the operation of the sintering device, so the personnel are not exposed to dust and noise.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims.

1‧‧‧Sintering trolley leak detection system of the invention

11‧‧‧RFID tags

12‧‧‧Sound signal acquisition unit

13‧‧‧Wire receiving unit

14‧‧‧Filter unit

15‧‧‧Data Processing Unit

16‧‧‧Sintered trolley

17‧‧‧Sintering machine track

18‧‧‧Support frame

19‧‧‧ top board

111‧‧‧ a metal plate

112‧‧‧Antenna structure

113‧‧‧RFID chip

114‧‧‧First side

115‧‧‧Second side

116‧‧‧Circuit structure

117‧‧‧ reference plane

118‧‧‧Extension plane

119‧‧‧Extended metal sheet

1 is a schematic view showing the application of the sintering trolley gas leakage detecting system of the present invention to a sintering process; FIG. 2 is a schematic view showing the RFID tag of the present invention; FIG. 3 is a flow chart showing the gas leakage detecting method of the sintering trolley of the present invention; The rms value curve of the sound signal of the sintering trolley air leakage detection using the sintering trolley gas leakage detecting system of the present invention in one operation cycle.

1‧‧‧Sintering trolley leak detection system of the invention

11‧‧‧RFID tags

12‧‧‧Sound signal acquisition unit

13‧‧‧Wire receiving unit

14‧‧‧Filter unit

15‧‧‧Data Processing Unit

16‧‧‧Sintered trolley

17‧‧‧Sintering machine track

18‧‧‧Support frame

19‧‧‧ top board

Claims (31)

A sintering trolley air leakage detecting method includes the following steps: (a) setting a preset resolution; (b) extracting a plurality of sound signals at the preset resolution; and (c) obtaining an interval information according to a transmitted signal At least one radio frequency identification system (RFID) tag is disposed in at least one of the plurality of sintering trolleys, the RFID tag is configured to generate the transmitting signal, and the preset resolution is according to the RFID tag. And (d) calculating and judging the location of the gas leakage of the sintering trolley based on the interval information, the sound signals, and a set sound pressure value. The detection method of claim 1, wherein the preset resolution is set to be 0.1 second to 1.0 second or one vehicle unit time in the step (a), wherein the trolley unit time is the sintering trolley length of the sintering trolley. Distance required time. The method of claim 1, wherein in the step (b), at least one audio signal capturing unit is disposed adjacent to one of the opposite sides and the top surface of the sintering trolley to capture the sound signals. . The method of claim 1, wherein in the step (b), a plurality of sound signal capturing units are disposed, which are respectively adjacent to opposite sides and a top surface of the sintering trolleys. The detection method of claim 1, wherein in step (b), the sound signals are captured by a sound pressure microphone. The detection method of claim 1, wherein the filtering is further included in the step (b) In step, the audio signals are filtered by a filtering unit. The detection method of claim 6, wherein the filtering signal is filtered by a high-pass filter. The detection method of claim 6, wherein in step (b), the signal having a frequency lower than 20 Hz in the audio signals is filtered. The detecting method of claim 1, wherein in step (c), the transmitting signal of the RFID tag is received by a wireless receiving unit. The detecting method of claim 1, wherein an RFID tag is disposed in each of the sintering carts in the detecting method. The detection method of claim 10, wherein in step (c), a wireless receiving unit receives the transmission signals of the RFID tags. The method of claim 1, wherein the step (d) further comprises the step of calculating the signal strength of the audio signals. The method of claim 12, wherein in step (d), if at least one of the signal strengths is greater than the set sound pressure value, calculating the sound signal and the interval information according to the intensity greater than the set sound pressure value And to determine the location of the gas leakage of the sintering trolley. The method of detecting the item 12, wherein in step (d), the root mean square value of the audio signals is calculated. The detecting method of claim 1, wherein in the step (d), the set sound pressure value is set to a sound pressure root mean square value greater than 0.5 Pa (Pa). A sintering trolley air leakage detecting system includes: at least one RFID tag disposed on at least one of a plurality of sintering trolleys for generating a transmitting signal; At least one sound signal capturing unit is adjacent to the sintering trolleys, and captures a plurality of sound signals at a preset resolution, the preset resolution is set according to the configuration of the RFID tags; and a wireless receiving unit receives the emission The signal is used to generate an interval signal; and a data processing unit is configured to calculate and determine the position of the sintering trolley in which the air leak occurs based on the sound signal, the interval signal and a set sound pressure value. The sintering trolley leak detection system of claim 16, wherein the RFID tag comprises: a metal plate; an antenna structure electrically connected to the metal plate; and an RFID chip, the two ends of which are electrically connected to the antenna structure, the RFID The wafer, the antenna structure and the metal plate form a loop structure. The sintering trolley air leakage detecting system of claim 16, wherein the preset resolution is set to 0.1 second to 1.0 second or one vehicle unit time, wherein the unit time of the trolley is the distance of the sintering trolleys through a sintering trolley length Time required. The sintering trolley leak detection system of claim 16, wherein the interval information indicates a distance during which the sintering trolley moves, and a distance at which the RFID tag moves and a moving time. The sintering trolley leak detection system of claim 16, wherein the leak detection system comprises a plurality of RFID tags, each RFID tag being disposed in each sintering trolley. The sintering trolley air leakage detecting system of claim 20, wherein the interval information is a distance between two RFID tags of the RFID tags and a time during which the sintering trolleys move the separation distance. The sintering trolley air leakage detecting system of claim 16, wherein the sound signal capturing unit is adjacent to one of the opposite side and the top surface of the sintering trolley. The sintering trolley air leakage detecting system of claim 16, wherein the air leakage detecting system comprises a plurality of sound signal capturing units respectively adjacent to opposite side and top surfaces of the sintering trolleys. The sintering trolley air leakage detecting system of claim 16, wherein the sound signal capturing unit is a sound pressure microphone. The sintering trolley leak detection system of claim 16, wherein the data processing unit is a computer. The sintering trolley leak detection system of claim 16, further comprising a filtering unit for receiving the sound signals and filtering the sound signals. The sintering trolley air leakage detecting system of claim 26, wherein the filtering unit filters signals having a frequency lower than 20 Hz in the audio signals. The sintering trolley leak detection system of claim 26, wherein the filtering unit is a high pass filter. The sintering trolley leak detection system of claim 26, wherein the data processing unit receives the interval signal to obtain an interval information, and receives the filtered audio signal and calculates the signal strength thereof, and according to the signal strength and the interval Information, calculation and judgment of the location of the sintering trolley where air leakage occurs. The sintering trolley leak detection system of claim 29, wherein the set sound pressure value is set to a sound pressure root mean square value greater than 0.5 Pa (Pa). The sintering trolley air leakage detecting system of claim 30, wherein if at least one of the signal strengths is greater than the set sound pressure value, calculating and judging sintering according to the sound signal and the interval information whose intensity is greater than the set sound pressure value The position where the trolley leaked.