A high-performance ladle magnesia carbon brick preparation system and method

Abstract

The present invention relates to the field of ladle magnesia carbon brick preparation, and in particular to a high-performance ladle magnesia carbon brick preparation system and method, comprising: a forming module for converting brick green material into ladle magnesia carbon brick of target shape, including a pressing assembly and a sintering furnace; a filling module for filling brick green material; an exhaust gas emission module for processing and discharging the exhaust gas generated by the sintering furnace; a detection module for detecting characteristic parameters of magnesia carbon brick preparation; a control module for adjusting the filling method of brick green material according to the compressive strength of the brick green material, adjusting the heating method in the sintering furnace according to the flow rate of the brick green material, and adjusting the duration of low-speed heating in the sintering furnace according to the change in the exhaust gas emission rate within a unit cycle. The present invention improves the thermal shock resistance of ladle magnesia carbon bricks by precisely controlling the raw material filling method, the sintering furnace heating method, and the heating time interval.

Description

Technical Field

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

[0002] With the continuous development of the steel industry, the demand for high-quality steel is increasing, placing higher demands on the performance of ladle lining materials. High-performance ladle magnesia carbon bricks can meet the steel industry's needs for improving production efficiency, reducing costs, and ensuring product quality, and therefore have broad market prospects. Ladles are crucial equipment in the steelmaking process, responsible for storing, transporting, and refining molten steel. The performance of ladle lining materials directly impacts the ladle's service life, molten steel quality, and steelmaking efficiency. Magnesia carbon bricks are widely used for ladle linings due to their excellent corrosion resistance, thermal shock resistance, and high-temperature resistance. High-performance ladle magnesia carbon bricks can extend the ladle's service life, reduce ladle maintenance, lower production costs, and ensure stable molten steel quality. Traditional ladle magnesia carbon brick production methods often suffer from uneven composition and a loose structure, resulting in unstable performance. For example, cracking and flaking are common during use, affecting the ladle's service life. With increasing environmental protection requirements, traditional production methods face increasing pressure, necessitating the development of more environmentally friendly production technologies. With the continuous enhancement of environmental awareness, the environmental protection requirements in the preparation process of ladle magnesia carbon bricks are becoming higher and higher. Developing green and environmentally friendly preparation technologies, reducing pollutant emissions, and realizing resource recycling have become the inevitable trend of industry development.

[0003] Chinese Patent Publication No. CN115093236A discloses a forsterite VD / VOD ladle clearance area magnesia carbon brick and its preparation method, comprising: preparing from the following raw materials in weight ratio: 15-30% forsterite particles of 3-5mm, 15-30% forsterite particles of 1-3mm, 40-60% recycled magnesia carbon brick particles of ≤1mm, 0-5% additives, and 3-5% binder; the performance index requirements of the forsterite particles are MgO content ≥42%, Fe2O3 content ≤8.5%, SiO2 content ≤45%, loss on ignition ≤6.5%, and bulk density ≥2.69g / cm 3 The bulk density of the recycled magnesia carbon brick particles is ≥3.25g / cm 3The preparation method is to first add the raw materials, additives, and binders in a mixer in proportion and mix them evenly; then press them into bricks on a 630-ton press; and then send them into a drying kiln for sintering. The sintering furnace takes 12 hours to heat the temperature to 200±10℃, and then keeps the temperature for another 4 hours. Therefore, this invention has the problem of not being able to detect the pressing rate by the flow rate of the brick raw materials, and thus being unable to adjust the heating method of the sintering furnace, which in turn makes it impossible to detect whether the quality of the magnesia carbon bricks meets the requirements. Summary of the Invention

[0004] To this end, the present invention provides a high-performance ladle magnesia carbon brick preparation system and method to overcome the problem in the prior art that the pressing rate cannot be detected by the flow velocity of the brick raw material, thereby being unable to adjust the heating mode of the sintering furnace, and further resulting in being unable to detect whether the quality of the magnesia carbon bricks meets the requirements.

[0005] To achieve the above objectives, the present invention provides a high-performance ladle magnesia carbon brick preparation system, comprising:

[0006] A forming module, for converting the brick raw material into a ladle magnesia carbon brick of a target shape, comprising a pressing assembly for pressing the brick raw material to output the bricks and a sintering furnace arranged below the pressing assembly for sintering the bricks into finished ladle magnesia carbon bricks;

[0007] A filling module connected to the forming module for filling brick raw materials, comprising a raw material box for providing a mixing place for the brick raw materials and a feeding component connected to the raw material box for inputting the brick raw materials into the raw material box;

[0008] An exhaust gas emission module, connected to the forming module, for processing and discharging the exhaust gas output by the sintering furnace;

[0009] A detection module, which is respectively connected to the forming module, the filling module and the tail gas emission module, and is used to detect the characteristic parameters of the preparation of magnesia carbon bricks;

[0010] a control module, which is respectively connected to the filling module, the forming module and the exhaust gas emission module, and is used to determine the filling method of the feeding component according to the compressive strength of the brick, determine whether the moisture retention capacity of the brick meets the requirements according to the compressive strength of the brick and the flow rate of the brick raw material, and adjust the pressing rate of the pressing component and the heating method in the sintering furnace according to the judgment result, and adjust the duration of the low-speed heating in the sintering furnace according to the change in the exhaust gas emission rate within a unit cycle;

[0011] The characteristic parameters for preparing the magnesia carbon bricks include the compressive strength of the bricks, the flow rate of the brick raw materials, and the emission rate of the tail gas.

[0012] Furthermore, the feeding assembly includes:

[0013] a raw material feeding pipe, which is arranged above the raw material box;

[0014] a binder feeding pipe, which is arranged above the raw material box away from the raw material feeding pipe;

[0015] A stirrer is provided at the bottom of the raw material box and is used to stir the brick raw materials;

[0016] A feeding and conveying pipeline is arranged below the raw material box and is used for conveying the brick raw materials to a target location.

[0017] Furthermore, the pressing assembly includes:

[0018] A pressing mold, which is arranged below the raw material box and is used to constrain the pressed shape of the brick raw material;

[0019] a punch, which is arranged above the pressing die and is used to compress the brick;

[0020] A hydraulic cylinder is provided above the punch to provide power for the punch to move in the vertical direction;

[0021] A piston push rod is connected to the hydraulic cylinder and is used to transmit a moving torque along the vertical direction to the punch.

[0022] Furthermore, the forming module also includes a conveyor belt arranged below the pressing mold for transporting the bricks to a target position.

[0023] Furthermore, the exhaust emission module includes:

[0024] an exhaust pipe connected to the sintering furnace for discharging exhaust gas;

[0025] An activated carbon adsorption box is connected to the exhaust pipe and is used to adsorb organic pollutants and odors in the exhaust gas.

[0026] Furthermore, the detection module includes:

[0027] a thermal test flow meter, which is arranged on the inner wall of the exhaust pipe and is used to detect the emission rate of the exhaust gas;

[0028] A laser Doppler velocimeter, which is arranged on the inner wall of the feeding and conveying pipe and is used to detect the flow velocity of the brick raw materials;

[0029] A pressure testing machine is arranged on the side of the conveyor belt and is used to test the compressive strength of the bricks.

[0030] Furthermore, if the compressive strength of the brick is less than the preset compressive strength, the method of adding the brick raw materials and the binder is adjusted from adding the brick raw materials and the binder successively to adding the unit weight of the brick raw materials first and then the unit weight of the binder alternately.

[0031] Furthermore, 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 first heating according to the first heating rate and then heating according to the second heating rate.

[0032] Wherein, the first heating rate is less than the second heating rate; and the reduction range of the pressing rate is determined by the difference between the flow rate of the brick raw material and the preset flow rate.

[0033] Furthermore, if the change in the exhaust gas emission rate within a unit period is greater than a preset emission rate change, the duration of the low-speed temperature increase in the sintering furnace is increased;

[0034] Among them, the duration of the low-speed heating is the duration of heating according to the first heating rate, and the change in the exhaust gas emission rate within 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 beginning.

[0035] The present invention also provides a method for preparing high-performance ladle magnesia carbon bricks, comprising:

[0036] Adding the brick raw materials into the raw material box respectively and stirring them to output the brick raw materials;

[0037] Pressing the brick raw materials to output the bricks;

[0038] The bricks are sintered in a sintering furnace to output ladle magnesia carbon bricks;

[0039] Treating and discharging the tail gas generated by the sintering furnace;

[0040] Adjusting the filling method of the brick blank raw materials according to the compressive strength of the brick blank;

[0041] Determining whether the water retention capacity of the brick meets the requirements based on the compressive strength of the brick and the flow rate of the brick raw material;

[0042] If the water retention capacity of the green brick does not meet the requirements, adjusting the heating mode in the sintering furnace and the pressing rate of the pressing assembly;

[0043] The duration of the low-speed temperature increase in the sintering furnace is adjusted according to the change in the exhaust gas emission rate within a unit cycle.

[0044] Compared with the prior art, the beneficial effects of the present invention are that the system of the present invention, by setting a filling module, a forming module, an exhaust emission module, a detection module and a control module, adjusts the filling method of the brick raw materials according to the compressive strength of the brick, thereby overcoming the problem that the magnesium carbon brick product cannot achieve a relatively stable compressive strength due to the uneven mixing of the brick raw materials; determines whether the moisture retention capacity of the brick meets the requirements according to the flow rate of the brick raw materials, thereby overcoming the error in the pressing effect caused by the inaccurate judgment of the excessive moisture retention capacity of the brick due to the excessive flow rate of the brick raw materials; adjusts the heating method in the sintering furnace according to the flow rate of the brick raw materials, thereby overcoming the problem of errors in sintering uniformity and consistency of the sintering structure during the sintering process caused by the excessive moisture retention capacity of the brick; adjusts the duration of low-speed heating in the sintering furnace according to the change in the exhaust emission rate within a unit cycle, thereby overcoming the problem of unstable reaction caused by improper heating time interval.

[0045] Furthermore, the present invention sets a preset compressive strength, determines whether the internal connection degree of the brick does not meet the requirements based on the structural integrity of the brick after pressing, and changes the method of adding brick raw materials and binders from sequential addition to alternating addition, thereby overcoming the problem that some raw materials are mixed with the binder first while other raw materials are not mixed sufficiently, thereby making the raw materials and binders more evenly distributed in the entire mixing system.

[0046] Furthermore, the present invention adjusts the heating mode of the sintering furnace according to the flow rate of the brick raw materials by setting a preset flow rate, changing the original uniform heating mode to first low-speed heating and then uniform heating. This overcomes the problem of side reactions in the sintering furnace affecting the brick structure due to improper heating mode, and also overcomes the problem of product quality degradation due to improper pressing rate, thereby achieving an improvement in the brick qualification rate.

[0047] Furthermore, the present invention overcomes the problem of stress concentration inside the sintering furnace due to excessively rapid heating, which may lead to more intense chemical reactions in the sintering furnace, or local overheating that may cause equipment damage or even explosions and other dangerous situations, by setting a preset emission rate change and adjusting the heating method in the sintering furnace, thereby improving the controllability of the sintering furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural diagram of a high-performance ladle magnesia-carbon brick preparation system according to an embodiment of the present invention;

[0049] Figure 2 This is a block diagram of the overall structure of a high-performance ladle magnesia-carbon brick preparation system according to an embodiment of the present invention;

[0050] Figure 3This 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;

[0051] Figure 4 This is a flow chart of a method for preparing high-performance ladle magnesia-carbon bricks according to an embodiment of the present invention;

[0052] The figures are marked as follows: 1-raw material feeding pipe, 2-raw material box, 3-agitator, 4-feeding and conveying pipe, 5-laser Doppler velocimeter, 6-conveyor belt, 7-sintering furnace, 8-exhaust pipe, 9-thermal test flowmeter, 10-activated carbon adsorption box, 11-pressing mold, 12-punch, 13-piston push rod, 14-hydraulic cylinder, 15-binder feeding pipe. DETAILED DESCRIPTION

[0053] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0054] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0055] It will be understood by those skilled in the art that, unless otherwise 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 refers to 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 that a module is "connected" or "coupled" to another module, it can be directly connected or coupled to the other module, or there can be an intermediate unit. In addition, "connected" or "coupled" as used herein may include wireless connection or wireless coupling.

[0056] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, they are respectively a structural diagram of a high-performance ladle magnesia carbon brick preparation system, an overall structural block diagram, a structural block diagram of a forming module, and a flow chart of a high-performance ladle magnesia carbon brick preparation method according to an embodiment of the present invention; a high-performance ladle magnesia carbon brick preparation system according to the present invention comprises:

[0057] A forming module, used to convert the brick raw materials into ladle magnesia carbon bricks of target shape, including a pressing assembly for pressing the brick raw materials to output the bricks and a sintering furnace 7 arranged below the pressing assembly for sintering the bricks into finished ladle magnesia carbon bricks;

[0058] A filling module connected to the forming module for filling brick raw materials, comprising a raw material box 2 for providing a mixing place for the brick raw materials and a feeding component connected to the raw material box 2 for inputting the brick raw materials into the raw material box 2;

[0059] An exhaust gas emission module, connected to the forming module, for processing and discharging the exhaust gas output by the sintering furnace 7;

[0060] A detection module, which is respectively connected to the forming module, the filling module and the tail gas emission module, and is used to detect the characteristic parameters of the preparation of magnesia carbon bricks;

[0061] a control module, which is respectively connected to the filling module, the forming module and the tail gas emission module, and is used to determine the filling method of the feeding assembly according to the compressive strength of the brick, determine whether the moisture retention capacity of the brick meets the requirements according to the compressive strength of the brick and the flow rate of the brick raw material, and adjust the pressing rate of the pressing assembly and the heating method in the sintering furnace 7 according to the judgment result, and adjust the duration of the low-speed heating in the sintering furnace 7 according to the change in the exhaust gas emission rate within a unit cycle;

[0062] The characteristic parameters for preparing the magnesia carbon bricks include the compressive strength of the bricks, the flow rate of the brick raw materials, and the emission rate of the tail gas.

[0063] In implementation, the system of the present invention is provided with a filling module, a forming module, an exhaust emission module, a detection module and a control module, and adjusts the filling method of the brick raw materials according to the compressive strength of the brick, thereby overcoming the problem that the magnesium carbon brick products cannot achieve a relatively stable compressive strength due to the uneven mixing of the brick raw materials; determines whether the moisture retention capacity of the brick meets the requirements according to the flow rate of the brick raw materials, thereby overcoming the error in the pressing effect caused by the inaccurate judgment of the excessive moisture retention capacity of the brick due to the excessive flow rate of the brick raw materials; adjusts the heating method in the sintering furnace 7 according to the flow rate of the brick raw materials, thereby overcoming the problem of errors in the sintering uniformity and the consistency of the sintered structure during the sintering process due to the excessive moisture retention capacity of the brick; adjusts the duration of the low-speed heating in the sintering furnace 7 according to the change in the exhaust emission rate within a unit period, thereby overcoming the problem of unstable reaction caused by improper heating time interval.

[0064] Specifically, the feeding assembly includes:

[0065] A raw material feeding pipe 1 is provided above the raw material box 2;

[0066] a binder feeding pipe 15, which is arranged above the raw material box 2 away from the raw material feeding pipe;

[0067] A stirrer 3, which is arranged at the bottom of the raw material box 2 and is used to stir the brick raw materials;

[0068] The feeding and conveying pipeline 4 is arranged below the raw material box 2 and is used to convey the brick raw materials to the target location.

[0069] Specifically, the pressing assembly includes:

[0070] A pressing mold 11 is provided below the raw material box 2 to constrain the pressed shape of the brick raw material;

[0071] a punch 12, which is arranged above the pressing die 11 and is used to compress the brick;

[0072] A hydraulic cylinder 14 is provided above the punch 12 to provide power for the punch 12 to move in the vertical direction;

[0073] The piston push rod 13 is connected to the hydraulic cylinder 14 and is used to transmit the moving torque along the vertical direction to the punch 12 .

[0074] Specifically, the forming module further includes a conveyor belt 6 disposed below the pressing mold 11 for transporting the bricks to a target position.

[0075] Specifically, the raw material for the bricks is a mixture of magnesia and graphite in a ratio of 1:1.

[0076] Specifically, the exhaust emission module includes:

[0077] an exhaust pipe 8 connected to the sintering furnace 7 for discharging exhaust gas;

[0078] An activated carbon adsorption box 10, which is connected to the exhaust pipe 8 and is used to adsorb organic pollutants and odors in the exhaust gas;

[0079] A chimney is connected to the activated carbon adsorption box 10 and is used to discharge the gas treated by the activated carbon adsorption box 10 .

[0080] Specifically, the detection module includes:

[0081] a thermal test flow meter 9, which is arranged on the inner wall of the exhaust pipe 8 and is used to detect the emission rate of the exhaust gas;

[0082] A laser Doppler velocimeter 5 is provided on the inner wall of the feeding and conveying pipe 4 to detect the flow velocity of the brick raw material;

[0083] A pressure testing machine (not shown) is provided on the side of the conveyor belt to test the compressive strength of the bricks.

[0084] Specifically, if the compressive strength of the brick is less than the preset compressive strength, the method of adding the brick raw materials and the binder is adjusted from adding the brick raw materials and the binder successively to adding the unit weight of the brick raw materials first and then the unit weight of the binder alternately.

[0085] In practice, the present invention sets a preset compressive strength, determines whether the internal connection degree of the brick does not meet the requirements based on the structural integrity of the brick after pressing, and changes the method of adding brick raw materials and binders from sequential addition to alternating addition, thereby overcoming the problem that some raw materials are mixed with the binder first while other raw materials are not mixed sufficiently, thereby making the raw materials and binders more evenly distributed in the entire mixing system.

[0086] Optionally, the preset compressive strength value range may be [30 MPa, 60 MPa];

[0087] Preferably, the preferred embodiment of the preset compressive strength is 50 MPa;

[0088] In a specific embodiment, the compressive strength of the brick is 35 MPa, which is less than the preset compressive strength. The method of adding the brick raw materials and the binder is changed from adding the brick raw materials first and then adding the binder to alternately adding the brick raw materials and the binder.

[0089] Specifically, 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 7 is changed from uniform heating to first heating according to the first heating rate and then heating according to the second heating rate.

[0090] Wherein, the first heating rate is less than the second heating rate; and the reduction range of the pressing rate is determined by the difference between the flow rate of the brick raw material and the preset flow rate.

[0091] Optionally, the preset flow velocity may be in the range of [0.08 m / s, 0.12 m / s];

[0092] Preferably, the preset flow velocity is 0.1 m / s.

[0093] 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].

[0094] Preferably, the first heating rate is 5° C. / min, and the second heating rate is 10° C. / min.

[0095] In practice, the present invention adjusts the heating mode of the sintering furnace 7 according to the flow rate of the brick raw material by setting a preset flow rate, changing the original uniform heating mode to first low-speed heating and then uniform heating. This overcomes the problem of side reactions in the sintering furnace 7 affecting the brick structure due to improper heating mode, and also overcomes the problem of product quality degradation due to improper pressing rate, thereby achieving an improvement in the brick qualification rate.

[0096] During implementation, every time the flow velocity of the brick raw material exceeds the preset flow velocity within 0.05 m / s, the pressing rate is adjusted to 0.92 times the pressing rate of the current pressing assembly. If the flow velocity of the brick raw material exceeds the preset flow velocity by more than 0.05 m / s, the pressing rate of the pressing assembly is reduced by 0.01 m / min for every 0.005 m / s it exceeds. In a possible embodiment, the pressing rate of the pressing assembly is 2 m / min, the compressive strength of the brick is 35 MPa, which is less than the preset compressive strength, and the flow velocity of the brick raw material is 0.2 m / s, which is greater than the preset flow velocity. The heating mode 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 assembly 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.

[0097] Specifically, if the change in the exhaust gas emission rate within a unit period is greater than the preset emission rate change, the duration of the low-speed heating in the sintering furnace 7 is increased;

[0098] Among them, the duration of the low-speed heating is the duration of heating according to the first heating rate, and the change in the exhaust gas emission rate within 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 beginning.

[0099] In practice, the present invention overcomes the problem of stress concentration inside the sintering furnace 7 due to excessively rapid heating, which may lead to more intense chemical reactions in the sintering furnace 7, or local overheating may cause equipment damage or even explosion and other dangerous situations, by setting a preset emission rate change and adjusting the heating method in the sintering furnace 7, thereby improving the controllability of the sintering furnace 7.

[0100] Optionally, the preset emission rate variation may be in the range of [8 g / min, 20 g / min];

[0101] Preferably, the preferred embodiment of the preset discharge rate variation is 15 g / min;

[0102] During implementation, the change in the emission rate of exhaust gas within a unit period is 24 g / min, which is greater than the preset emission rate change. For every 2 g / min that the change in the emission rate of exhaust gas within a unit period exceeds the preset emission rate change, the duration of low-speed heating in the sintering furnace 7 is increased by 2s compared with the current low-speed heating duration. The current low-speed heating duration is 2 minutes, and the adjusted low-speed heating duration is 2+[(24-15) / 2]×0.5=4.25min.

[0103] The present invention also provides a method for preparing a high-performance ladle magnesia carbon brick preparation system, comprising:

[0104] Step S1, adding the brick raw materials into the raw material box 2 and stirring to output the brick raw materials;

[0105] Step S2, pressing the brick raw material to output the brick;

[0106] Step S3, using a sintering furnace 7 to sinter the bricks to output ladle magnesia carbon bricks;

[0107] Step S4, treating and discharging the tail gas generated by the sintering furnace 7;

[0108] Step S5, adjusting the filling method of the brick raw material according to the compressive strength of the brick;

[0109] Step S6, determining whether the water retention capacity of the brick meets the requirements based on the compressive strength of the brick and the flow rate of the brick raw material;

[0110] Step S7: If the water retention capacity of the green brick does not meet the requirements, the heating mode in the sintering furnace 7 and the pressing rate of the pressing assembly are adjusted;

[0111] Step S8, adjusting the duration of the low-speed temperature increase in the sintering furnace 7 according to the change in the exhaust gas emission rate within a unit cycle.

[0112] Specifically, the composition and weight ratio of the brick raw materials include 80% magnesia (MgO) and 15% graphite (carbon).

[0113] Specifically, phenolic resin or asphalt is preferably used as the binder, and the binder content is 5%.

[0114] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A high-performance ladle magnesia carbon brick preparation system, characterized in that: include: A forming module, for converting the brick raw material into a ladle magnesia carbon brick of a target shape, comprising a pressing assembly for pressing the brick raw material to output the bricks and a sintering furnace arranged below the pressing assembly for sintering the bricks into finished ladle magnesia carbon bricks; A filling module connected to the forming module for filling brick raw materials, comprising a raw material box for providing a mixing place for the brick raw materials and a feeding component connected to the raw material box for inputting the brick raw materials into the raw material box; An exhaust gas emission module, connected to the forming module, for processing and discharging the exhaust gas output by the sintering furnace; A detection module, which is respectively connected to the forming module, the filling module and the tail gas emission module, and is used to detect the characteristic parameters of the preparation of magnesia carbon bricks; a control module, which is respectively connected to the filling module, the forming module and the exhaust gas emission module, and is used to determine the filling method of the feeding component according to the compressive strength of the brick, determine whether the moisture retention capacity of the brick meets the requirements according to the compressive strength of the brick and the flow rate of the brick raw material, and adjust the pressing rate of the pressing component and the heating method in the sintering furnace according to the judgment result, and adjust the duration of the low-speed heating in the sintering furnace according to the change in the exhaust gas emission rate within a unit cycle; The characteristic parameters of the preparation of magnesia carbon bricks include the compressive strength of the bricks, the flow rate of the brick raw materials and the emission rate of the tail gas; If the compressive strength of the brick is less than the preset compressive strength, the method of adding the brick raw materials and the binder is adjusted from the method of adding the brick raw materials and the binder in sequence to the method of adding the unit weight of the brick raw materials first and then the unit weight of the binder alternately; 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 water 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 first heating according to the first heating rate and then heating according to the second heating rate. The first heating rate is less than the second heating rate; the reduction in the pressing rate is determined by the difference between the flow rate of the brick raw material and the preset flow rate; If the change in the exhaust gas emission rate within a unit period is greater than a preset emission rate change, increasing the duration of the low-speed heating in the sintering furnace; The duration of the low-speed heating is the duration of heating according to the first heating rate, and the change in the exhaust gas emission rate within 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 beginning.

2. The high-performance ladle magnesia carbon brick preparation system according to claim 1 is characterized in that: The feeding assembly comprises: a raw material feeding pipe, which is arranged above the raw material box; a binder feeding pipe, which is arranged above the raw material box away from the raw material feeding pipe; A stirrer is provided at the bottom of the raw material box and is used to stir the brick raw materials; A feeding and conveying pipeline is arranged below the raw material box and is used for conveying the brick raw materials to a target location.

3. The high-performance ladle magnesia carbon brick preparation system according to claim 2 is characterized in that: The pressing assembly comprises: A pressing mold, which is arranged below the raw material box and is used to constrain the pressed shape of the brick raw material; a punch, which is arranged above the pressing die and is used to compress the brick; A hydraulic cylinder is provided above the punch to provide power for the punch to move in the vertical direction; A piston push rod is connected to the hydraulic cylinder and is used to transmit a moving torque along the vertical direction to the punch.

4. The high-performance ladle magnesia carbon brick preparation system according to claim 3 is characterized in that: The forming module further includes a conveyor belt arranged below the pressing mold for conveying the bricks to a target position.

5. The high-performance ladle magnesia carbon brick preparation system according to claim 4 is characterized in that: The tail gas emission module includes: an exhaust pipe connected to the sintering furnace for discharging exhaust gas; An activated carbon adsorption box is connected to the exhaust pipe and is used to adsorb 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 flow meter, which is arranged on the inner wall of the exhaust pipe and is used to detect the emission rate of the exhaust gas; A laser Doppler velocimeter, which is arranged on the inner wall of the feeding and conveying pipe and is used to detect the flow velocity of the brick raw materials; A pressure testing machine is arranged on the side of the conveyor belt and is used to test the compressive strength of the bricks.

7. A method for preparing high-performance ladle magnesia carbon bricks, applied to the high-performance ladle magnesia carbon brick preparation system according to any one of claims 1 to 6, characterized in that: include: Adding the brick raw materials into the raw material box respectively and stirring them to output the brick raw materials; Pressing the brick raw materials to output the bricks; The bricks are sintered in a sintering furnace to output ladle magnesia carbon bricks; Treating and discharging the tail gas generated by the sintering furnace; Adjusting the filling method of the brick blank raw materials according to the compressive strength of the brick blank; Determining whether the water retention capacity of the brick meets the requirements based on the compressive strength of the brick and the flow rate of the brick raw material; If the water retention capacity of the green brick does not meet the requirements, adjusting the heating mode in the sintering furnace and the pressing rate of the pressing assembly; The duration of the low-speed temperature increase in the sintering furnace is adjusted according to the change in the exhaust gas emission rate within a unit cycle.

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