TW202407106A - Inspection method of material in top bin of blast furnace - Google Patents

Abstract

The present disclosure provides an inspection method of material in a top bin of a blast furnace, including using a microwave rangefinder to measure a material height of material in the top bin of the blast furnace. Use a thermal imager to measure a material shape of the material in the top bin of the blast furnace and a cross section of the top bin of the blast furnace at the material height. Compute a flow rate of volume when a distributing trough is distributing material at a distributing angle according to a variation of the material height within a time interval and the cross section. Adjust quantity of the material flowing out from the top bin of the blast furnace according to the flow rate of the volume.

Description

Method for detecting cloth in blast furnace top silo

The present disclosure relates to a detection method, and in particular, to a method for detecting the material in a blast furnace top silo that can detect the material in a blast furnace top silo.

The conventional blast furnace ironmaking process has long been based on the numerical detection of a scale installed at the bottom of the silo as the basis for silo operation.

However, during the process of transporting the furnace materials to the furnace top silo by belts, vibrations often cause the furnace materials to occasionally overflow outwards. After a long period of conveying operation, the overflowing charge accumulates in the gap between the weighing scale and the silo structure, causing the scale to interfere with the structure, thereby causing the weighing value to be inaccurate. In addition, the blast furnace silo must be gas-filled. Due to the close operation, there will be pressure charging and releasing actions. This pressure charging and releasing process will also cause the zero point of the scale to drift, which will cause variations in the calculation of the cloth distribution time, and ultimately affect the stability of the blast furnace cloth operation.

Therefore, one of the purposes of the embodiments of the present disclosure is to provide a method for detecting the material distribution in the blast furnace top silo, using thermal imaging technology and microwave ranging technology to detect the material in the blast furnace top silo, as a basis for the detection of material distribution in the blast furnace top silo. Thermal imaging technology allows the operator to confirm the material surface shape of the raw materials in the blast furnace top silo, which can then be used as a basis for adjusting the amount of material in and out of the blast furnace top silo, so that the silo can maximize the material distribution volume without interfering with the blast furnace top material. The air-tight valve of the warehouse interferes. Microwave ranging technology is used as a representative value of the material height of the blast furnace top silo. By changing the material height value directly at the center of the bottom of the silo, the action time of the material can be calculated, and then the distribution process of the blast furnace top silo can be grasped. , and then grasp the amount of material discharged by the distribution trough at each cloth corner in the blast furnace top silo during the cloth distribution process, so that the resulting material surface shape is not subject to changes in raw material characteristics and raw material particle size variations under the operator's supervision. influence, thereby stabilizing blast furnace production.

According to the above purpose of the present disclosure, a method for detecting the material distribution in the blast furnace top silo is proposed, which includes using a microwave range finder to measure the height of the material distribution in the blast furnace top silo. Use a thermal imager to measure the distribution shape of the raw materials in the blast furnace top silo and the cross-sectional area of the blast furnace top silo at the height of the distribution. The volume flow rate under the cloth angle when distributing material in the distribution trough on the top of the blast furnace is calculated based on the change in cloth height within time and the cross-sectional area. The amount of raw material flowing out of the blast furnace top silo is adjusted accordingly according to the volume flow rate.

According to some embodiments of the present disclosure, the above-mentioned method for detecting the distribution of materials in the blast furnace top silo further includes calculating the distribution of the raw material distributed by the blast furnace top distribution trough under the cloth corner within the amount of time through the volume flow rate and the amount of time. Material volume.

According to some embodiments of the present disclosure, the above-mentioned method for detecting the distribution of materials in the blast furnace top silo further includes calculating the amount of raw materials distributed by the distribution trough of the blast furnace top under the cloth corner within the amount of time based on the distribution volume and the volume density of the raw materials. fabric weight.

According to some embodiments of the present disclosure, the above method for detecting the material in the blast furnace top silo further includes adjusting the opening of the flow opening control valve of the blast furnace top material trough when the weight of the material exceeds the control standard range.

According to some embodiments of the present disclosure, the above-mentioned method for detecting the distribution in the blast furnace top silo further includes setting the amount of raw material entering the blast furnace top silo based on the average particle size and volume-to-weight ratio of the raw material.

According to some embodiments of the present disclosure, the above-mentioned blast furnace top silo includes an upper airtight valve disposed on the top of the blast furnace top silo, and the upper airtight valve is used to control the pressure in the blast furnace top silo.

According to some embodiments of the present disclosure, the above-mentioned method for detecting the material in the blast furnace top silo further includes adjusting the amount of raw material entering the blast furnace top silo when the height of the material is close to the height of the upper air-tight valve.

According to some embodiments of the present disclosure, the above-mentioned method for detecting the material in the blast furnace top silo further includes setting the material according to the average particle size and volume-to-weight ratio of the raw material before using a microwave range finder to measure the height of the raw material in the blast furnace top silo. Flow opening controls the opening of the valve.

According to some embodiments of the present disclosure, the selection point of the microwave range finder relative to the bottom of the blast furnace top silo is disposed on the top of the blast furnace top silo.

According to some embodiments of the present disclosure, the above selected point is the center of the bottom of the blast furnace top silo.

As can be seen from the above embodiments of the present disclosure, the present disclosure mainly detects the raw materials in the blast furnace top silo by arranging a microwave range finder and a thermal imager on the top of the blast furnace top silo. Among them, the microwave range finder detects the height of the cloth, and uses the height of the cloth as the reference value. Through the change of the cloth height, the action time of the blast furnace top silo during cloth distribution is calculated, and then the blast furnace top silo is used in the cloth distribution process. , the amount of material the fabric trough places at each fabric corner. On the other hand, the thermal imager detects the distribution shape of the raw materials in the blast furnace top silo, which is then used as a basis for adjusting the amount of material in and out of the blast furnace top silo, so that the blast furnace top silo can maximize the distribution volume without disturbing the Operation of the upper airtight valve.

Embodiments of the present disclosure are discussed in detail below. It is to be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The embodiments discussed and disclosed are for illustration only and are not intended to limit the scope of the present disclosure.

Please refer to FIG. 1 , which is a schematic diagram of a blast furnace top silo 100 according to some embodiments of the present disclosure. In one embodiment, the blast furnace top silo 100 includes a microwave range finder 200, a thermal imager 300, a flow opening control valve 400, an upper airtight valve 500, and a lower airtight valve 600.

The microwave range finder 200 is installed on the blast furnace top silo 100 and is configured to measure the distribution height of raw materials in the blast furnace top silo 100 using microwave ranging technology. In one embodiment, the selection point of the microwave range finder 200 relative to the bottom of the blast furnace top silo 100 is disposed on the top of the blast furnace top silo 100 . In an exemplary example, the selected point is the center of the bottom of the blast furnace top silo 100, so the operator can measure the cloth height after aligning with the center of the bottom of the blast furnace top silo 100 as the reference value. By measuring the change in the cloth height after facing the center of the bottom of the blast furnace top silo 100, we can calculate the action time of the blast furnace top silo 100 during the cloth distribution, and then grasp the blast furnace top silo 100 during the cloth distribution process. , the feeding amount of the distribution trough (not shown) at each cloth corner makes the resulting material surface shape not affected by changes in raw material characteristics and raw material particle size variations under the operator's monitoring, thus stabilizing the production of the blast furnace.

The thermal imager 300 is installed on the top of the blast furnace top silo 100 . The thermal imager 300 is configured to use thermal imaging technology to detect the distribution shape of the raw materials in the blast furnace top silo 100, and then use it as a basis for adjusting the amount of material in and out of the blast furnace top silo 100, so that the blast furnace top silo 100 can maximize its use. amount of cloth, and does not interfere with the operation of the upper air-tight valve 500.

The flow opening control valve 400 is disposed at the bottom of the blast furnace top silo 100 and is coupled to the air-tight valve 600 . The flow opening control valve 400 is configured to increase or decrease the flow rate of raw materials when they are discharged from the blast furnace top silo 100 . In one embodiment, before using the microwave range finder 200 to measure the height of the raw materials in the blast furnace top silo 100, the opening of the flow opening control valve 400 is set based on the average particle size and volume-to-weight ratio of the raw materials.

The lower airtight valve 600 is provided at the bottom of the blast furnace top silo 100, and is configured to charge and relieve the pressure of the blast furnace top silo 100, thereby preventing the gas in the blast furnace from leaking during the discharge process of the blast furnace top silo 100, and This allows the blast furnace to complete the addition of raw materials in a closed manner, allowing for continuous production without interruption.

Please refer to FIG. 2 , which is a flow chart of a method 700 for detecting cloth in a blast furnace top silo according to an embodiment of the present disclosure. The method 700 for detecting the material in the blast furnace top silo is applicable to the blast furnace top silo 100 in Figure 1 or other similar blast furnace top silos. The following description takes the blast furnace top silo 100 used in FIG. 1 as an example. The method 700 for detecting the material distribution in the blast furnace top silo includes operation 710 of using the microwave range finder 200 to measure the distribution height of the raw materials in the blast furnace top silo 100 . In one embodiment, when the height of the material distribution is close to the height of the upper air-tight valve 500, the amount of raw materials entering the blast furnace top silo 100 is adjusted to avoid accumulation of raw materials and not interfere with the opening and closing of the upper air-tight valve 500, and The amount of raw materials with different characteristics that can be added to the blast furnace top silo 100 is determined based on the cloth height. In one embodiment, the operator can set the amount of raw materials entering the blast furnace top silo 100 based on the average particle size and volume-to-weight ratio of the raw materials. After completing the weight proportioning on the ground in advance, the blast furnace top materials are then input through the conveyor belt. In the warehouse 100, the flexibility of adding raw materials to the blast furnace is improved.

In operation 720 , the thermal imager 300 is used to measure the distribution shape of the raw materials in the blast furnace top silo 100 and the cross-sectional area of the blast furnace top silo 100 at height. In some embodiments, in order to keep the distribution shape of the raw materials stable in the blast furnace top silo 100, during the discharging process of the blast furnace top silo 100, changes in the weight of the blast furnace top silo 100 relative to time are recorded, so as to After calculating the raw material out of the blast furnace top silo 100, through the rotation of the distribution trough, the distribution weight of the blast furnace is distributed under different settings of the number of turns. In some embodiments, when the weight of the cloth exceeds the control standard range set by the operator, the opening of the flow opening control valve 400 of the blast furnace top silo 100 is adjusted so that the weight of the cloth falls within the control standard range. This further stabilizes the distribution operation of the blast furnace (not shown).

Please refer to FIGS. 2 and 3 . FIG. 3 is a schematic diagram illustrating the cross-sectional area of the blast furnace top silo 100 in FIG. 1 at the raw material distribution height. In operation 730 , the volume flow rate under the cloth angle when the material is distributed in the blast furnace top silo 100 is calculated based on the change of the cloth height within a time amount and the cross-sectional area. In operation 740, the amount of raw material flowing out of the blast furnace top silo 100 is adjusted accordingly according to the volumetric flow rate.

Specifically, assuming that the distance D between the top of the blast furnace top silo 100 and the cloth height is higher than the height L ₁ (D<L ₁ ), since there is an angle a in the blast furnace top silo 100, the amount of time is Δt ₁ , when the maximum diameter of the blast furnace top silo 100 is R, the volume flow rate at this time is:

When the distance D between the top of the blast furnace top silo 100 and the height of the cloth is greater than the height L ₁ and higher than the height L ₂ (L ₁ <D <L ₂ ), the maximum diameter of the blast furnace top silo 100 is R In the case of , when the amount of time is Δt ₂ , the volume flow rate at this time is:

When the distance D between the top of the blast furnace top silo 100 and the cloth height is much lower than the height L ₂ (D>L ₂ ), since there is an angle b in the blast furnace top silo 100, in the amount of time Δt ₃ , When the maximum diameter of the blast furnace top silo 100 is R, the volume flow rate at this time is:

In one embodiment, since the distribution trough (not shown) rotates at a constant speed for distribution, the operator can start timing after the lower airtight valve 600 is opened, and calculate the blast furnace top material based on the volume flow rate and the amount of time. The warehouse 100 lays out the cloth volume of the raw material under the cloth corner within a certain amount of time. In this embodiment, the cloth weight of the raw materials laid out in the blast furnace top silo 100 under the cloth angle within a time amount can be further calculated based on the cloth volume and the bulk density of the raw materials.

As can be seen from the above embodiments of the present disclosure, the present disclosure mainly detects the raw materials in the blast furnace top silo by arranging a microwave range finder and a thermal imager on the top of the blast furnace top silo. Among them, the microwave range finder detects the height of the cloth, and uses the height of the cloth as the reference value. Through the change of the cloth height, the action time of the blast furnace top silo during cloth distribution is calculated, and then the blast furnace top silo is used in the cloth distribution process. , the amount of material the fabric trough places at each fabric corner. On the other hand, the thermal imager detects the distribution shape of the raw materials in the blast furnace top silo, which is then used as a basis for adjusting the amount of material in and out of the blast furnace top silo, so that the blast furnace top silo can maximize the distribution volume without disturbing the Operation of the upper airtight valve.

Although the disclosure has been disclosed above through embodiments, they are not intended to limit the disclosure. Anyone with ordinary knowledge in the technical field may make slight changes and modifications without departing from the spirit and scope of the disclosure. Therefore, The scope of protection of this disclosure shall be determined by the scope of the appended patent application.

100: Blast furnace top silo 200:Microwave range finder 300: Thermal imager 400: Flow opening control valve 500: Upper air tight valve 600: Lower air tight valve 700: Method for detecting cloth in blast furnace top silo 710: Operation 720: Operation 730: Operation 740: Operation D: distance L1: height L2: height R: diameter a: angle b: angle

In order to make the above and other objects, features, advantages and embodiments of the present invention more apparent and understandable, the detailed description of the accompanying drawings is as follows: Figure 1 is a schematic diagram of a blast furnace top silo device according to some embodiments of the present disclosure; Figure 2 is a flow chart illustrating a method for detecting cloth in a blast furnace top silo according to an embodiment of the present disclosure; and Figure 3 is a schematic diagram illustrating the cross-sectional area of the blast furnace top silo in Figure 1 at the material distribution height.

Domestic storage information (please note in order of storage institution, date and number) without Overseas storage information (please note in order of storage country, institution, date, and number) without

100: Blast furnace top silo

200:Microwave range finder

300: Thermal imager

400: Flow opening control valve

500: Upper air tight valve

600: Lower air tight valve

Claims (10)

A method for detecting cloth in a blast furnace top silo, including: Use a microwave range finder to measure a distribution height of a raw material in a blast furnace top silo; Use a thermal imager to measure a distribution shape of the raw material in the blast furnace top silo and a cross-sectional area of the blast furnace top silo at the height of the distribution; Calculate a volume flow rate under a cloth corner when distributing material in a blast furnace top distribution trough based on the change in the distribution height within a period of time and the cross-sectional area; and According to the volume flow rate, the amount of the raw material flowing out of the blast furnace top silo is correspondingly adjusted. The method for detecting cloth in the blast furnace top silo as described in request item 1 further includes: A distribution volume of the raw material distributed by the blast furnace top distribution trough under the cloth angle within the period of time is calculated based on the volume flow rate and the amount of time. The method for detecting cloth in the blast furnace top silo as described in request item 2 further includes: A cloth weight of the raw material distributed by the blast furnace top distribution trough under the cloth corner within the amount of time is calculated based on the cloth volume and the bulk density of the raw material. The method for detecting cloth in the blast furnace top silo as described in request item 3 further includes: When the weight of the distribution exceeds a control standard range, the opening of the flow opening control valve of the distribution trough on the top of the blast furnace is adjusted. The method for detecting cloth in the blast furnace top silo as described in request item 1 further includes: The amount of the raw material entering the blast furnace top silo is set based on an average particle size of the raw material and a volume-to-weight ratio. The method for detecting the material in the blast furnace top silo as described in claim 5, wherein the blast furnace top silo includes: An upper airtight valve is arranged on a top of the blast furnace top silo, and the upper airtight valve is used to control the pressure in the blast furnace top silo. The method for detecting cloth in the blast furnace top silo as described in request item 6 further includes: When the height of the material distribution is close to a height of the upper air-tight valve, the amount of the raw material entering the blast furnace top silo is adjusted. The method for detecting cloth in the blast furnace top silo as described in request item 4 further includes: Before using the microwave range finder to measure the height of the raw material in the blast furnace top silo, the opening of the flow opening control valve is set based on the average particle diameter of the raw material and the volume-to-weight ratio. The method for detecting materials in a blast furnace top silo as described in claim 1, wherein the microwave range finder is disposed on the top of the blast furnace top silo relative to a selection point at a bottom of the blast furnace top silo. The method for detecting the material in the blast furnace top silo as described in claim 9, wherein the selected point is the center of the bottom of the blast furnace top silo.

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