High-performance ladle magnesia carbon brick preparation system and method

Abstract

The invention relates to the field of steel ladle magnesia carbon brick preparation, in particular to a high-performance steel ladle magnesia carbon brick preparation system and method.The high-performance steel ladle magnesia carbon brick preparation system comprises a forming module used for converting a green brick raw material into a steel ladle magnesia carbon brick in a target shape and comprising a pressing assembly and a sintering furnace; the filling module is used for filling green brick raw materials; the tail gas discharging module is used for treating and discharging tail gas generated by the sintering furnace; the detection module is used for detecting magnesia carbon brick preparation characteristic parameters; and the control module is used for adjusting the filling mode of the raw materials of the green bricks according to the compressive strength of the green bricks, adjusting the heating mode in the sintering furnace according to the flowing speed of the raw materials of the green bricks, and adjusting the duration of low-speed heating in the sintering furnace according to the variable quantity of the emission rate of the tail gas in the unit period. The thermal shock resistance of the ladle magnesia carbon brick is improved by precisely regulating and controlling the raw material filling mode, the sintering furnace heating mode and the heating time interval.

Description

Technical Field

[0001] The present invention relates to the field of preparation of ladle magnesia-carbon bricks, and particularly to a high-performance preparation system and method for ladle magnesia-carbon bricks. Background Art

[0002] With the continuous development of the iron and steel industry, the demand for high-quality steel has been increasing day by day, which puts higher requirements on the performance of ladle lining materials. High-performance ladle magnesia-carbon bricks can meet the needs of iron and steel enterprises for improving production efficiency, reducing costs, and ensuring product quality, so the market prospect is broad. As an important equipment in the steelmaking process, the ladle undertakes the important tasks of storing, transporting, and refining molten steel. The performance of the ladle lining material directly affects the service life of the ladle, the quality of molten steel, and the efficiency of steelmaking. Magnesia-carbon bricks are widely used in ladle linings due to their good erosion resistance, thermal shock resistance, and high-temperature resistance. High-performance ladle magnesia-carbon bricks can improve the service life of the ladle, reduce the number of ladle repairs, lower production costs, and at the same time ensure the stability of the quality of molten steel. Traditional methods for preparing ladle magnesia-carbon bricks often have problems such as uneven composition and non-dense structure, resulting in unstable performance of magnesia-carbon bricks. For example, cracking and spalling are likely to occur during use, affecting the service life of the ladle. With the continuous improvement of environmental protection requirements, traditional preparation methods are facing increasing environmental protection pressure and need to seek more environmentally friendly preparation technologies. With the continuous enhancement of environmental awareness, the environmental protection requirements during the preparation process of ladle magnesia-carbon bricks are also getting higher and higher. Developing green and environmentally friendly preparation technologies, reducing pollutant emissions, and realizing the recycling of resources have become an inevitable trend in the development of the industry.

[0003] Chinese Patent Publication No.: CN115093236A discloses a magnesia olivine-based VD / VOD ladle freeboard magnesia-carbon brick and a preparation method thereof, including: prepared from raw materials according to the following weight ratios: 15-30% of 3-5 mm magnesia olivine particles, 15-30% of 1-3 mm magnesia olivine particles, 40-60% of ≤1 mm recycled magnesia-carbon brick particle material, 0-5% of additives, and 3-5% of binder; the performance index requirements of the magnesia olivine particles are that the MgO content ≥42%, the Fe2O3 content ≤8.5%, the SiO2 content ≤45%, the loss on ignition ≤6.5%, and the bulk density ≥2.69 g / cm 3 ; the bulk density of the recycled magnesia-carbon brick particle material ≥3.25 g / cm 3; The preparation method is to first add raw materials, additives, and binders into a blender in proportion and stir evenly; press them into brick blanks on a 630-ton press; send them into a drying kiln for sintering. The sintering furnace is heated to 200 ± 10 °C in 12 hours and then kept warm for 4 hours. Thus, the invention has the problem that the pressing rate cannot be detected through the flow rate of the brick blank raw materials, so the heating method of the sintering furnace cannot be adjusted, and further, the quality of the magnesia-carbon brick cannot be detected whether it meets the requirements. Summary of the Invention

[0004] Therefore, the present invention provides a preparation system and method for high-performance ladle magnesia-carbon bricks to overcome the problems in the prior art that the pressing rate cannot be detected through the flow rate of the brick blank raw materials, so the heating method of the sintering furnace cannot be adjusted, and further, the quality of the magnesia-carbon brick cannot be detected whether it meets the requirements.

[0005] To achieve the above object, the present invention provides a preparation system for high-performance ladle magnesia-carbon bricks, including: A forming module for converting brick blank raw materials into ladle magnesia-carbon bricks of a target shape, including a pressing component for pressing the brick blank raw materials to output brick blanks and a sintering furnace arranged below the pressing component for sintering the brick blanks into finished ladle magnesia-carbon bricks; A feeding module connected to the forming module for feeding brick blank raw materials, including a raw material tank for providing a stirring place for the brick blank raw materials and a feeding component connected to the raw material tank for inputting the brick blank raw materials into the raw material tank; An exhaust gas emission module connected to the forming module for treating and discharging the exhaust gas output by the sintering furnace; A detection module respectively connected to the forming module, the feeding module, and the exhaust gas emission module for detecting the characteristic parameters of magnesia-carbon brick preparation; A control module respectively connected to the feeding module, the forming module, and the exhaust gas emission module for determining the feeding method of the feeding component according to the compressive strength of the brick blank, determining whether the moisture retention ability of the brick blank meets the requirements according to the compressive strength of the brick blank and the flow rate of the brick blank raw materials, adjusting the pressing rate of the pressing component and adjusting the heating method in the sintering furnace according to the determination result, and adjusting the low-speed heating duration in the sintering furnace according to the change amount of the exhaust gas emission rate per unit cycle; Wherein, the characteristic parameters of magnesia-carbon brick preparation include the compressive strength of the brick blank, the flow rate of the brick blank raw materials, and the exhaust gas emission rate.

[0006] Further, the feeding component includes: A raw material feeding pipe arranged above the raw material tank; The binder feeding pipe is arranged above the raw material box away from the raw material feeding pipe; The stirrer is arranged at the bottom of the raw material box for stirring the brick blank raw materials; The feeding and conveying pipeline is arranged below the raw material box for conveying the brick blank raw materials to the target position.

[0007] Further, the pressing assembly includes: The pressing mold is arranged below the raw material box for restricting the pressing shape of the brick blank raw materials; The punch is arranged above the pressing mold for compressing the brick blank; The hydraulic cylinder is arranged above the punch for providing the moving power of the punch in the vertical direction; The piston push rod is connected to the hydraulic cylinder for transmitting the moving torque in the vertical direction to the punch.

[0008] Further, the forming module further includes a conveyor belt arranged below the pressing mold for conveying the brick blank to the target position.

[0009] Further, the tail gas emission module includes: The exhaust pipeline is connected to the sintering furnace for discharging tail gas; The activated carbon adsorption box is connected to the exhaust pipeline for adsorbing organic pollutants and odors in the tail gas.

[0010] Further, the detection module includes: The hot test flowmeter is arranged on the inner wall of the exhaust pipeline for detecting the emission rate of the tail gas; The laser Doppler velocimeter is arranged on the inner wall of the feeding and conveying pipeline for detecting the flow velocity of the brick blank raw materials; The pressure testing machine is arranged on the side of the conveyor belt for detecting the compressive strength of the brick blank.

[0011] Further, if the compressive strength of the brick blank is less than the preset compressive strength, the feeding method of the brick blank raw materials and the binder is adjusted from the method of adding the brick blank raw materials and the binder successively to the alternating adding method of adding a unit weight of brick blank raw materials first and then a unit weight of binder.

[0012] Further, if the compressive strength of the brick blank is less than the preset compressive strength and the flow velocity of the brick blank raw materials is greater than the preset flow velocity, it is determined that the moisture retention capacity of the brick blank does not meet the requirements, the pressing rate of the pressing assembly is reduced, and the heating method in the sintering furnace is changed from uniform heating to heating at a first heating rate first and then at a second heating rate. Among them, the first heating rate is less than the second heating rate; the reduction amplitude of the pressing rate is determined by the difference between the flow rate of the green brick raw material and the preset flow rate.

[0013] Further, if the change amount of the emission rate of the tail gas within a unit cycle is greater than the preset emission rate change amount, the duration of low-speed heating in the sintering furnace is increased; Among them, the duration of low-speed heating is the duration of heating at the first heating rate, and the change amount of the emission rate of the tail gas within a unit cycle is the absolute value of the difference between the emission rate at the end moment of the unit cycle and the emission rate at the start moment.

[0014] The present invention also provides a preparation method for a high-performance ladle magnesia-carbon brick, including: Respectively add the green brick raw materials into the raw material box and stir to output the green brick raw materials; Press the green brick raw materials to output green bricks; Use a sintering furnace to sinter the green bricks to output ladle magnesia-carbon bricks; Treat and discharge the tail gas generated by the sintering furnace; Adjust the feeding method of the green brick raw materials according to the compressive strength of the green bricks; Determine whether the moisture retention capacity of the green bricks meets the requirements according to the compressive strength of the green bricks and the flow rate of the green brick raw materials; If the moisture retention capacity of the green bricks does not meet the requirements, adjust the heating method in the sintering furnace and the pressing rate of the pressing component; Adjust the duration of low-speed heating in the sintering furnace according to the change amount of the emission rate of the tail gas within a unit cycle.

[0015] Compared with the prior art, the beneficial effects of the present invention are that the system of the present invention overcomes the problem that the magnesia-carbon brick products cannot reach a relatively stable compressive strength due to uneven mixing of the green brick raw materials by setting a feeding module, a forming module, a tail gas emission module, a detection module and a control module, and adjusting the feeding method of the green brick raw materials according to the compressive strength of the green bricks; determines whether the moisture retention capacity of the green bricks meets the requirements according to the flow rate of the green brick raw materials, and overcomes the error in the pressing effect caused by inaccurate determination of the excessive moisture retention capacity of the green bricks reflected by the too fast flow rate of the green brick raw materials; adjusts the heating method in the sintering furnace according to the flow rate of the green brick raw materials, and overcomes the problem of errors in the sintering uniformity and the consistency of the sintering structure that may occur during the sintering process due to the too high moisture retention capacity of the green bricks; adjusts the duration of low-speed heating in the sintering furnace according to the change amount of the emission rate of the tail gas within a unit cycle, and overcomes the problem of unstable reaction caused by improper heating time interval.

[0016] Furthermore, the present invention sets a preset compressive strength, determines that the internal connection degree of the green brick is not in line with the requirements according to the structural integrity of the green brick after compacting, and changes the feeding method of the brick raw materials and the binder from sequential feeding to alternating feeding, overcoming the problem that some raw materials are mixed with the binder first while other raw materials are not fully mixed, thereby making the distribution of the raw materials and the binder more uniform in the entire mixing system.

[0017] Furthermore, the present invention sets a preset flow rate, adjusts the heating method of the sintering furnace according to the flow rate of the brick raw materials, changing from the original uniform heating to first low-speed heating and then uniform heating, overcoming the problem that side reactions occur in the sintering furnace due to improper heating method, which affects the structure of the bricks, and also overcoming the problem of product quality decline caused by improper pressing rate, and achieving an improvement in the qualified rate of the bricks.

[0018] Furthermore, the present invention sets a preset discharge rate change amount, and overcomes the problem that due to too fast heating, stress concentration occurs inside the sintering furnace, resulting in a relatively violent chemical reaction in the sintering furnace, or, due to local overheating, dangerous situations such as equipment damage or even explosion may occur, by adjusting the heating method in the sintering furnace, improving the controllability of the sintering furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural diagram of a high-performance ladle magnesia-carbon brick preparation system according to an embodiment of the present invention; Figure 2 is an overall structural block diagram of a high-performance ladle magnesia-carbon brick preparation system according to an embodiment of the present invention; Figure 3 is a structural block diagram of a forming module of a high-performance ladle magnesia-carbon brick preparation system according to an embodiment of the present invention; Figure 4 is a flowchart of a high-performance ladle magnesia-carbon brick preparation method according to an embodiment of the present invention; The reference numerals are as follows: 1 - raw material feeding pipe, 2 - raw material box, 3 - stirrer, 4 - feeding and conveying pipeline, 5 - laser Doppler velocimeter, 6 - conveyor belt, 7 - sintering furnace, 8 - exhaust pipeline, 9 - hot test flowmeter, 10 - activated carbon adsorption box, 11 - pressing die, 12 - punch, 13 - piston push rod, 14 - hydraulic cylinder, 15 - binder feeding pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0022] Those skilled in the art can understand that unless specifically stated, the singular forms "a", "an", and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in this specification means the presence of features, integers, steps, operations, elements / components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements / components. It should be understood that when we say a module is "connected" or "coupled" to another module, it can be directly connected or coupled to other modules, or there may also be intermediate units. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling.

[0023] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 as shown, which are respectively the structure diagram of the high-performance ladle magnesia-carbon brick preparation system of the embodiment of the present invention, the overall structure block diagram, the structure block diagram of the forming module, and the flow chart of the high-performance ladle magnesia-carbon brick preparation method; A high-performance ladle magnesia-carbon brick preparation system of the present invention includes: A forming module for converting brick blank raw materials into ladle magnesia-carbon bricks of a target shape, including a pressing assembly for pressing the brick blank raw materials to output brick blanks and a sintering furnace 7 provided below the pressing assembly for sintering the brick blanks into finished ladle magnesia-carbon bricks; A filling module connected to the forming module for filling brick blank raw materials, including a raw material tank 2 for providing a mixing place for brick blank raw materials and a feeding assembly connected to the raw material tank 2 for inputting brick blank raw materials into the raw material tank 2; An exhaust gas emission module connected to the forming module for treating and discharging the exhaust gas output by the sintering furnace 7; A detection module respectively connected to the forming module, the filling module, and the exhaust gas emission module for detecting the characteristic parameters of magnesia-carbon brick preparation; A control module respectively connected to the filling module, the forming module, and the exhaust gas emission module for determining the filling method of the feeding assembly according to the compressive strength of the brick blank, determining whether the moisture retention ability of the brick blank meets the requirements according to the compressive strength of the brick blank and the flow rate of the brick blank raw materials, and adjusting the pressing rate of the pressing assembly and adjusting the heating method in the sintering furnace 7 according to the determination result, and adjusting the low-speed heating duration in the sintering furnace 7 according to the change amount of the exhaust gas emission rate per unit cycle; Among them, the characteristic parameters for preparing the magnesia-carbon brick include the compressive strength of the brick blank, the flow rate of the raw materials of the brick blank, and the emission rate of the tail gas.

[0024] In implementation, the system of the present invention overcomes the problem that the magnesia-carbon brick product cannot achieve a relatively stable compressive strength due to uneven mixing of the raw materials of the brick blank by setting a filling module, a forming module, a tail gas emission module, a detection module, and a control module, and adjusting the filling method of the raw materials of the brick blank according to the compressive strength of the brick blank; determines whether the moisture retention capacity of the brick blank meets the requirements according to the flow rate of the raw materials of the brick blank, and overcomes the error in the pressing effect caused by inaccurate determination of the excessive moisture retention capacity of the brick blank reflected by the too fast flow rate of the raw materials of the brick blank; adjusts the heating method in the sintering furnace 7 according to the flow rate of the raw materials of the brick blank, and overcomes the problem of errors in the sintering uniformity and the consistency of the sintering structure that may occur during the sintering process due to the excessive moisture retention capacity of the brick blank; adjusts the duration of low-speed heating in the sintering furnace 7 according to the change amount of the emission rate of the tail gas within a unit cycle, and overcomes the problem of unstable reaction caused by improper heating time interval.

[0025] Specifically, the feeding assembly includes: A raw material feeding pipe 1, which is arranged above the raw material tank 2; A binder feeding pipe 15, which is arranged above the raw material tank 2 far away from the raw material feeding pipe; A stirrer 3, which is arranged at the bottom of the raw material tank 2 for stirring the raw materials of the brick blank; A feeding conveying pipeline 4, which is arranged below the raw material tank 2 for conveying the raw materials of the brick blank to the target position.

[0026] Specifically, the pressing assembly includes: A pressing mold 11, which is arranged below the raw material tank 2 for restricting the pressing shape of the raw materials of the brick blank; A punch 12, which is arranged above the pressing mold 11 for compressing the brick blank; A hydraulic cylinder 14, which is arranged above the punch 12 for providing the moving power of the punch 12 in the vertical direction; A piston push rod 13, which is connected to the hydraulic cylinder 14 for transmitting the moving torque in the vertical direction to the punch 12.

[0027] Specifically, the forming module further includes a conveyor belt 6 arranged below the pressing mold 11 for conveying the brick blank to the target position.

[0028] Specifically, the raw materials of the brick blank are a mixture of magnesia and graphite mixed in a ratio of 1:1.

[0029] Specifically, the tail gas emission module includes: An exhaust duct 8, which is connected to the sintering furnace 7 for discharging tail gas; An activated carbon adsorption box 10, which is connected to the exhaust duct 8 for adsorbing organic pollutants and odors in the tail gas; A chimney, which is connected to the activated carbon adsorption box 10 for discharging the gas treated by the activated carbon adsorption box 10.

[0030] Specifically, the detection module includes: A hot test flowmeter 9, which is arranged on the inner wall of the exhaust duct 8 for detecting the emission rate of the tail gas; A laser Doppler velocimeter 5, which is arranged on the inner wall of the feeding and conveying pipeline 4 for detecting the flow velocity of the brick blank raw material; A pressure testing machine (not shown in the figure), which is arranged on the side of the conveyor belt for detecting the compressive strength of the brick blank.

[0031] Specifically, if the compressive strength of the brick blank is less than the preset compressive strength, the feeding method of the brick blank raw material and the binder is adjusted from the method of adding the brick blank raw material and the binder successively to the alternating adding method of first adding a unit weight of the brick blank raw material and then adding a unit weight of the binder.

[0032] In implementation, by setting the preset compressive strength, the present invention determines that the internal connection degree of the brick blank does not meet the requirements according to the structural integrity of the brick blank after pressing, and changes the feeding method of the brick blank raw material and the binder from sequential feeding to alternating feeding, overcoming the problem that some raw materials are mixed with the binder first while other raw materials are not fully mixed, so that the raw materials and the binder are more evenly distributed in the whole mixing system.

[0033] Optionally, the value range of the preset compressive strength can be [30 MPa, 60 MPa]; Preferably, the preferred embodiment of the preset compressive strength is 50 MPa; In a specific embodiment, the compressive strength of the brick blank is 35 MPa, which is less than the preset compressive strength, then the feeding method of the brick blank raw material and the binder is changed from the method of first adding the brick blank raw material and then adding the binder to the alternating feeding of the brick blank raw material and the binder.

[0034] Specifically, if the compressive strength of the brick blank is less than the preset compressive strength and the flow velocity of the brick blank raw material is greater than the preset flow velocity, it is determined that the moisture retention capacity of the brick blank does not meet the requirements, the pressing rate of the pressing component is reduced, and the heating method in the sintering furnace 7 is changed from uniform heating to heating at a first heating rate first and then heating at a second heating rate. Wherein, the first heating rate is less than the second heating rate; the reduction amplitude of the pressing rate is determined by the difference between the flow rate of the green brick material and the preset flow rate.

[0035] Optionally, the value range of the preset flow rate can be [0.08 m / s, 0.12 m / s]; Preferably, a preferred embodiment of the preset flow rate is 0.1 m / s.

[0036] In implementation, the optional range of the first heating rate is [4 °C / min, 7 °C / min], and the optional range of the second heating rate is [8 °C / min, 11 °C / min].

[0037] Preferably, a preferred embodiment of the first heating rate is 5 °C / min, and a preferred embodiment of the second heating rate is 10 °C / min.

[0038] In implementation, by setting the preset flow rate, the present invention adjusts the heating method of the sintering furnace 7 according to the flow rate of the green brick material, changing from the original uniform heating to first low-speed heating and then uniform heating, overcoming the problem that side reactions occur in the sintering furnace 7 due to improper heating methods and affecting the brick structure, and also overcoming the problem of product quality decline caused by improper pressing rate, achieving an improvement in the qualified rate of bricks.

[0039] In implementation, when the value by which the flow rate of the green brick material exceeds the preset flow rate is within 0.05 m / s, the pressing rate is adjusted to 0.92 times the pressing rate of the current pressing component. If the value by which the flow rate of the green brick material exceeds the preset flow rate exceeds 0.05 m / s, then for every 0.005 m / s exceeded, the pressing rate of the pressing component is reduced by 0.01 m / min. In a possible embodiment, the pressing rate of the pressing component is 2 m / min, the compressive strength of the green brick is 35 MPa, less than the preset compressive strength, and the flow rate of the green brick material is 0.2 m / s, greater than the preset flow rate. Then, the heating method in the sintering furnace 7 is changed from uniform heating to first low-speed heating and then uniform heating, and at the same time, the pressing rate of the pressing component is adjusted to 2 m / min × 0.92 - 0.01 m / min × (0.2 m / s - 0.1 m / s) / 0.005 m / s = 1.64 m / min.

[0040] Specifically, if the change amount of the emission rate of the tail gas within a unit cycle is greater than the preset emission rate change amount, the duration of low-speed heating in the sintering furnace 7 is increased; Wherein, the duration of the low-speed temperature rise is the duration of the temperature rise at the first temperature rise rate, and the change amount of the emission rate of the tail gas in a unit cycle is the absolute value of the difference between the emission rate at the end moment and the emission rate at the start moment of the unit cycle.

[0041] In implementation, by setting a preset change amount of the emission rate and adjusting the temperature rise mode in the sintering furnace 7, the present invention overcomes the problem that the internal stress concentration in the sintering furnace 7 may be caused by too fast temperature rise, resulting in a relatively intense chemical reaction in the sintering furnace 7, or, due to local overheating, dangerous situations such as equipment damage or even explosion may occur, and improves the controllability of the sintering furnace 7.

[0042] Optionally, the value range of the preset change amount of the emission rate can be [8 g / min, 20 g / min]; Preferably, a preferred embodiment of the preset change amount of the emission rate is 15 g / min; In implementation, the change amount of the emission rate of the tail gas in a unit cycle is 24 g / min, which is greater than the preset change amount of the emission rate. For every 2 g / min that the change amount of the emission rate of the tail gas in a unit cycle exceeds the preset change amount of the emission rate, the duration of the low-speed temperature rise in the sintering furnace 7 increases by 2 s compared to the current duration of the low-speed temperature rise. The current duration of the low-speed temperature rise is 2 minutes, and the adjusted duration of the low-speed temperature rise is 2 + [(24 - 15) / 2]×0.5 = 4.25 min.

[0043] The present invention also provides a preparation method for a high-performance ladle magnesia-carbon brick preparation system, including: Step S1, adding brick blank raw materials into the raw material box 2 respectively and stirring to output brick blank raw materials; Step S2, pressing the brick blank raw materials to output brick blanks; Step S3, sintering the brick blanks with the sintering furnace 7 to output ladle magnesia-carbon bricks; Step S4, treating and discharging the tail gas generated by the sintering furnace 7; Step S5, adjusting the feeding mode of the brick blank raw materials according to the compressive strength of the brick blanks; Step S6, determining whether the moisture retention ability of the brick blanks meets the requirements according to the compressive strength of the brick blanks and the flow rate of the brick blank raw materials; Step S7, if the moisture retention ability of the brick blanks does not meet the requirements, adjusting the temperature rise mode in the sintering furnace 7 and the pressing rate of the pressing component; Step S8, adjusting the duration of the low-speed temperature rise in the sintering furnace 7 according to the change amount of the emission rate of the tail gas in a unit cycle.

[0044] Specifically, the composition and weight ratio of the brick blank raw materials include 80% magnesia (MgO) and 15% graphite (carbon).

[0045] Specifically, the binder is preferably a phenolic resin or asphalt, and the component proportion of the binder is 5%.

[0046] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A preparation system for high-performance ladle magnesia-carbon bricks, characterized in that, Comprising: A forming module for converting refractory raw materials into ladle magnesia-carbon bricks of a target shape, including a pressing assembly for pressing the refractory raw materials to output green bricks and a sintering furnace disposed below the pressing assembly for sintering the green bricks into finished ladle magnesia-carbon bricks; A feeding module connected to the forming module for feeding refractory raw materials, including a raw material tank for providing a mixing place for the refractory raw materials and a feeding assembly connected to the raw material tank for inputting refractory raw materials into the raw material tank; An exhaust gas emission module connected to the forming module for treating and discharging the exhaust gas output from the sintering furnace; A detection module respectively connected to the forming module, the feeding module, and the exhaust gas emission module for detecting the characteristic parameters of magnesia-carbon brick preparation; A control module respectively connected to the feeding module, the forming module, and the exhaust gas emission module for determining the feeding method of the feeding assembly according to the compressive strength of the green bricks, determining whether the moisture retention capacity of the green bricks meets the requirements according to the compressive strength of the green bricks and the flow rate of the refractory raw materials, and adjusting the pressing rate of the pressing assembly and adjusting the heating method in the sintering furnace according to the determination result, and, adjusting the duration of low-speed heating in the sintering furnace according to the change amount of the exhaust gas emission rate per unit cycle; Wherein, the characteristic parameters of magnesia-carbon brick preparation include the compressive strength of the green bricks, the flow rate of the refractory raw materials, and the exhaust gas emission rate.

2. The high-performance ladle magnesia-carbon brick preparation system according to claim 1, characterized in that, The feeding assembly includes: A raw material feeding pipe disposed above the raw material tank; A binder feeding pipe disposed above the raw material tank away from the raw material feeding pipe; A stirrer disposed at the bottom of the raw material tank for stirring the refractory raw materials; A feeding conveying pipeline disposed below the raw material tank for conveying the refractory raw materials to a target position.

3. The high-performance ladle magnesia-carbon brick preparation system according to claim 2, characterized in that, The pressing assembly includes: A pressing die disposed below the raw material tank for restricting the pressing shape of the refractory raw materials; A punch disposed above the pressing die for compressing the green bricks; A hydraulic cylinder disposed above the punch for providing the moving power of the punch in the vertical direction; A piston push rod connected to the hydraulic cylinder for transmitting the moving torque in the vertical direction to the punch.

4. The high-performance ladle magnesia-carbon brick preparation system according to claim 3, wherein The forming module further includes a conveyor belt disposed below the pressing die for conveying the green bricks to a target position.

5. The high-performance ladle magnesia-carbon brick preparation system according to claim 4, characterized in that, The exhaust gas emission module includes: An exhaust pipeline connected to the sintering furnace for discharging exhaust gas; An activated carbon adsorption box connected to the exhaust pipeline for adsorbing organic pollutants and odors in the exhaust gas.

6. The high-performance ladle magnesia-carbon brick preparation system according to claim 5, characterized in that, The detection module includes: A thermal test flowmeter disposed on the inner wall of the exhaust pipeline for detecting the exhaust gas emission rate; A laser Doppler velocimeter disposed on the inner wall of the feeding conveying pipeline for detecting the flow rate of the refractory raw materials; A pressure testing machine disposed on the side of the conveyor belt for detecting the compressive strength of the green bricks.

7. The high-performance ladle magnesia-carbon brick preparation system according to claim 6, characterized in that, If the compressive strength of the green brick is less than the preset compressive strength, the feeding method of the green brick raw material and the binder is adjusted from the method of adding the green brick raw material and the binder successively to the alternating feeding method of adding a unit weight of the green brick raw material first and then a unit weight of the binder.

8. The high-performance ladle magnesia-carbon brick preparation system according to claim 7, characterized in that, If the compressive strength of the green brick is less than the preset compressive strength and the flow rate of the green brick raw material is greater than the preset flow rate, it is determined that the moisture retention capacity of the green brick does not meet the requirements, the pressing rate of the pressing assembly is reduced, and the heating method in the sintering furnace is changed from uniform heating to heating at a first heating rate first and then at a second heating rate. Wherein, the first heating rate is less than the second heating rate; the reduction amplitude of the pressing rate is determined by the difference between the flow rate of the green brick raw material and the preset flow rate.

9. The high-performance ladle magnesia-carbon brick preparation system according to claim 8, characterized in that, If the change amount of the emission rate of the tail gas in a unit cycle is greater than the preset emission rate change amount, the duration of low-speed heating in the sintering furnace is increased. Wherein, the duration of low-speed heating is the duration of heating at the first heating rate, and the change amount of the emission rate of the tail gas in a unit cycle is the absolute value of the difference between the emission rate at the end of the unit cycle and the emission rate at the start time.

10. A preparation method applied to the preparation system of the high-performance ladle magnesia-carbon brick according to any one of claims 1-9, characterized in that, Including: Adding the green brick raw material into the raw material box and stirring to output the green brick raw material; Pressing the green brick raw material to output the green brick; Using a sintering furnace to sinter the green brick to output a ladle magnesia-carbon brick; Treating and discharging the tail gas generated by the sintering furnace; Adjusting the feeding method of the green brick raw material according to the compressive strength of the green brick; Determining whether the moisture retention capacity of the green brick meets the requirements according to the compressive strength of the green brick and the flow rate of the green brick raw material; If the moisture retention capacity of the green brick does not meet the requirements, adjusting the heating method in the sintering furnace and the pressing rate of the pressing assembly; Adjusting the duration of low-speed heating in the sintering furnace according to the change amount of the emission rate of the tail gas in a unit cycle.

Images