A blast furnace slag treatment system and method

Abstract

The present invention discloses a blast furnace slag treatment system and method. The blast furnace slag granulation treatment system includes: a horizontal trough, a hydrogen content detection module, a temperature detection module, a flow rate detection module, a control module, a first refractory baffle, and a second refractory baffle; the hydrogen content detection module is used to detect the hydrogen content in the granulation box; the temperature detection module is used to detect the first temperature of the slag and the second temperature of the granulation water; the control module is used to determine an energy loss coefficient according to the first temperature, the second temperature, the first flow rate, and the second flow rate, and control the first refractory baffle and / or the second refractory baffle to be located in the horizontal trough according to the hydrogen content in the granulation box when the energy loss coefficient is less than a reference value. The present invention can greatly reduce the waste caused by the molten iron flowing into the granulation box, improve the detonation phenomenon in the granulation box, increase the molten iron recovery rate, and can also improve the water quenching effect of the granulated slag and improve the quality of the granulated slag.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel smelting, and particularly relates to a blast furnace slag treatment system and method. Background Art

[0002] Most of the slag generated by blast furnace smelting is processed through the granulated slag process. There are various types of granulated slag processes. No matter what kind of water quenching process it is, it uses high-speed and high-pressure flowing slag flushing water to quench the high-temperature liquid slag. The slag-water mixture is then separated to obtain a granulated slag product that can be reused.

[0003] In the blast furnace slag and iron tapping process, the slag-iron mixture flowing out from the taphole is separated into slag and iron through the main blast furnace trough. The upper-layer liquid slag has a lower density than the molten iron and flows out from the slag notch set along the upper edge of the main trough, entering the slag trough to be mixed with the high-pressure and high-speed slag flushing water.

[0004] There are many existing granulated slag processes, such as: Jiaheng method, Minter method, bottom filtration method, sedimentation tank method, etc. From the perspective of the collection point of the slag-water mixture, in most processes, the slag-water mixing occurs inside the flushing box. The steam generated during the water extraction by the flushing box is collected, and then discharged to the high altitude through the exhaust pipe above. This process mainly avoids the harm to the health of ground operators caused by the diffusion of steam in the area very close to the ground.

[0005] Under the existing conditions, a small number of blast furnace granulated slag processes adopt the sedimentation tank method. The slag flows through the slag trough and is mixed with high-pressure and high-speed slag flushing water at a certain position to achieve the water quenching function. This process must be set at a position on the furnace platform that is relatively lower than the ground (to ensure the free flow of the slag). During the water quenching process, a large amount of steam is directly diffused in the area near the ground. The steam contains other toxic gas components such as hydrogen, which causes greater harm to the regional equipment and the health of personnel.

[0006] In the existing granulated slag process, when the blast furnace temperature is relatively low, the slag is very likely to carry molten iron. The molten iron enters the slag flushing water with the slag, and hydrogen gas will be generated when it contacts water. The volume expansion will cause a detonation phenomenon. When the taphole is abnormal and the slag-iron flow rate is too large, the slag and iron do not have enough time to be effectively separated in the main trough, and the molten iron enters the slag trough and contacts the slag flushing water, and the hydrogen gas generated instantaneously expands in volume, causing a detonation phenomenon. When the slag-iron flow rate from the taphole is too large and the flow velocity is too fast, and the slag and iron do not have enough time to be separated, the slag will inevitably carry molten iron, and when it enters the slag flushing water, the hydrogen gas generated instantaneously expands in volume, causing a detonation phenomenon. No matter what the reason is, when the molten iron contacts the slag flushing water, a detonation phenomenon will inevitably be triggered. If the amount of molten iron entering the slag trough is relatively large, the detonation will be particularly prominent, forming an explosion.

[0007] In the open (sedimentation tank method) slag flushing process, explosions will inevitably cause high-temperature slag flushing water to carry slag and splash everywhere, which is very likely to damage regional equipment and personnel. In the flushing box, if a large amount of molten iron enters the flushing box and mixes with the slag flushing water, a large amount of hydrogen will be generated. When the hydrogen content reaches the explosion limit, an explosion accident will occur, which is very likely to damage the valves, pipes, equipment, etc. inside the flushing box, and will also cause harm to regional inspection personnel.

[0008] Under existing technical conditions, the slag ditch is generally in a closed state, and the operating status of the slag ditch cannot be monitored during the slag discharge process. It is difficult to accurately judge whether molten iron is contained in the slag. Only when the slag-water mixture produces an audible explosion sound can a preliminary judgment be made whether there is iron in the slag.

[0009] Under existing technical conditions, a large amount of hydrogen is generated when slag and water are mixed, and the volume expands until explosion occurs. As long as it does not endanger equipment and personnel, there is no good way to deal with it. If the amount of molten iron entering the slag flushing water increases and develops into an explosion, emergency plugging of the iron mouth is usually adopted to cut off the slag source and gradually eliminate the explosion. This operation process is time-consuming. It takes at least 5 minutes from the start of the plugging operation to the slag stopping flow. Emergency plugging will seriously affect the smooth operation of the blast furnace and increase energy consumption.

[0010] Under existing technical conditions, as long as there is iron in the slag, regardless of whether detonation occurs, it will lead to reduced molten iron recovery and some iron entering the slag, which will inevitably lead to reduced blast furnace output and increased smelting costs. Summary of the invention

[0011] The present invention provides a blast furnace slag treatment system and method, which can greatly reduce the waste caused by molten iron flowing into a punching box, improve the detonation phenomenon in the punching box, increase the molten iron recovery rate, and also improve the water quenching effect of the slag and improve the slag quality.

[0012] According to one aspect of the present invention, a blast furnace slag flushing treatment system is provided, the blast furnace slag flushing treatment system comprising: a horizontal ditch, a hydrogen content detection module, a temperature detection module, a flow rate detection module, a control module, a first refractory baffle and a second refractory baffle;

[0013] The horizontal groove is connected between the main groove and the slag groove; the main groove is connected to the blast furnace; the slag groove is connected to the punching box;

[0014] The hydrogen content detection module is used to detect the hydrogen content in the brewing box;

[0015] The temperature detection module is used to detect a first temperature of the slag and a second temperature of the slag flushing water;

[0016] The flow rate detection module is used to detect a first flow rate of slag and a second flow rate of slag flushing water in the horizontal groove;

[0017] The control module is connected to the hydrogen content detection module, the temperature detection module, and the flow rate detection module. The control module is configured to determine an energy loss coefficient based on the first temperature, the second temperature, the first flow rate, and the second flow rate, and control the first refractory baffle and / or the second refractory baffle to be located in the horizontal trench according to the hydrogen content in the punching box when the energy loss coefficient is less than a reference value; wherein, the first refractory baffle and the second refractory baffle located in the horizontal trench are used to block the slag in the horizontal trench from flowing into the slag trench.

[0018] Optionally, the control module is specifically configured to control the first refractory baffle to be located in the horizontal trench when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a first set value, control the first refractory baffle to withdraw from the horizontal trench and control the second refractory baffle to be located in the horizontal trench when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a second set value; control both the first refractory baffle and the second refractory baffle to be located in the horizontal trench when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a third set value; wherein, the position of the first refractory baffle in the horizontal trench is closer to the connection between the horizontal trench and the main trench than the position of the second refractory baffle in the horizontal trench; the first set value is less than the second set value, and the second set value is less than the third set value; the control module is further configured to control the second refractory baffle to withdraw from the horizontal trench when both the first refractory baffle and the second refractory baffle are located in the horizontal trench and the energy loss coefficient is less than the reference value and the energy loss coefficient is gradually increasing, and control the first refractory baffle to withdraw from the horizontal trench when the energy loss coefficient is equal to the reference value and the first refractory baffle is located in the horizontal trench.

[0019] Optionally, the blast furnace slag flushing treatment system provided in this embodiment further includes: a gas pressure detection module and an exhaust module;

[0020] The gas pressure detection module is used to detect the gas pressure in the punching box;

[0021] The exhaust module is used to release the gas pressure in the punching box;

[0022] The control module is connected to the air pressure detection module and the exhaust module. The control module is further configured to control the exhaust module in the punching box to open when the energy loss coefficient is greater than the reference value and the gas pressure in the punching box is greater than a fourth set value. When the energy loss coefficient is higher than the reference value and the gas pressure in the punching box is greater than a fifth set value, the control module is configured to control the first refractory baffle to be located in the horizontal groove. When the energy loss coefficient is higher than the reference value and the gas pressure in the punching box is greater than a sixth set value, the control module is configured to control both the first refractory baffle and the second refractory baffle to be located in the horizontal groove, wherein the fourth set value is less than the fifth set value, and the fifth set value is less than the sixth set value.

[0023] Optionally, the control module is further configured to determine the flow rate of the slag according to the first flow rate, and control the first refractory baffle to be located in the horizontal groove when the flow rate of the slag exceeds a seventh set value.

[0024] Optionally, the energy loss coefficient is determined according to the following formula:

[0025]

[0026] Wherein, is the energy loss coefficient, C1 is the specific heat capacity of water, M1 is the flow rate of the slag washing water, t2 is the second temperature of the slag washing water after mixing with the slag, t1 is the second temperature of the slag washing water before mixing with the slag, M3 is the amount of water vapor in the punching box, C2 is the specific heat capacity of the slag, M3 is the flow rate of the slag, and t3 is the first temperature of the slag.

[0027] Optionally, the thickness range of the first refractory baffle is 10 mm to 50 mm, and the height range of the first refractory baffle is 20 mm to 40 mm;

[0028] The thickness range of the second refractory baffle is 10 mm to 50 mm, and the height range of the second refractory baffle is 30 mm to 60 mm;

[0029] The distance range of the first refractory baffle from the slag outlet is 10 mm to 20 mm;

[0030] The distance range of the second refractory baffle from the slag outlet is 80 mm to 100 mm.

[0031] Optionally, the length range of the horizontal groove is 300 mm to 500 mm, and the width range of the horizontal groove is 300 mm to 400 mm;

[0032] The width of the horizontal groove is 100 mm to 200 mm wider than the width of the slag outlet.

[0033] Optionally, the horizontal groove includes a first groove and a second groove;

[0034] The first groove is used to accommodate the first refractory baffle, and the second groove is used to accommodate and fix the second refractory baffle;

[0035] The depth of the first groove is less than the height of the first refractory baffle; the depth of the second groove is less than the height of the second refractory baffle.

[0036] Optionally, the depth range of the first groove includes 8 mm to 10 mm; the depth range of the second groove includes 8 mm to 10 mm;

[0037] The width of the first groove is 3 mm to 10 mm larger than the thickness of the first refractory baffle;

[0038] The width of the second groove is 3 mm to 10 mm larger than the thickness of the second refractory baffle.

[0039] According to another aspect of the present invention, there is provided a blast furnace slag treatment method, which is applied to the blast furnace slag treatment system provided in any embodiment of the present invention;

[0040] The blast furnace slag treatment method includes:

[0041] The hydrogen content detection module detects the hydrogen content in the flushing box; the temperature detection module detects the first temperature of the slag and the second temperature of the slag flushing water; the flow rate detection module detects the first flow rate of the slag in the horizontal groove and the second flow rate of the slag flushing water;

[0042] The control module determines an energy loss coefficient according to the first temperature, the second temperature, the first flow rate and the second flow rate, and controls the first refractory baffle and / or the second refractory baffle to be located in the horizontal groove according to the hydrogen content in the flushing box when the energy loss coefficient is less than a reference value; wherein, the first refractory baffle and the second refractory baffle located in the horizontal groove are used to block the slag in the horizontal groove from flowing into the slag ditch.

[0043] This embodiment provides a blast furnace slag treatment system. A horizontal channel is provided in this blast furnace slag treatment system. The horizontal channel is connected between the main channel and the slag channel. The setting of the horizontal channel facilitates the temperature detection module to detect the first temperature of the slag and also facilitates the flow rate detection module to detect the first flow rate of the slag. The temperature detection module is also used to detect the second temperature of the slag flushing water, and the flow rate detection module is also used to detect the second flow rate of the slag flushing water. The hydrogen content detection module can detect the hydrogen content in the flushing box. The control module can determine the energy loss coefficient according to the first temperature, the second temperature, the first flow rate and the second flow rate. When the energy loss coefficient is less than the reference value, the control module can determine that molten iron flows into the flushing box, and hydrogen is generated after the molten iron reacts with the slag flushing water in the flushing box. The control module can control the first refractory baffle and / or the second refractory baffle to be located in the horizontal channel according to the hydrogen content in the flushing box, so as to reduce the amount of slag with molten iron flowing into the flushing box, thereby improving the water quenching effect of the granulated slag. In summary, the blast furnace slag treatment system provided by this embodiment can greatly reduce the waste caused by molten iron flowing into the flushing box, improve the detonation phenomenon in the flushing box, improve the molten iron recovery rate, can also improve the water quenching effect of the granulated slag, and improve the quality of the granulated slag.

[0044] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Brief Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0046] Figure 1 is a schematic mechanical structure diagram of a blast furnace slag flushing treatment system provided according to an embodiment of the present invention;

[0047] Figure 2 is a schematic functional structure diagram of a blast furnace slag flushing treatment system provided according to an embodiment of the present invention;

[0048] Figure 3 is a schematic flow chart of a blast furnace slag treatment method provided according to an embodiment of the present invention. Detailed Embodiments

[0049] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] Figure 1 is a schematic mechanical structure diagram of a blast furnace slag granulation treatment system provided according to an embodiment of the present invention. Refer to Figure 1 , the blast furnace slag granulation treatment system provided in this embodiment includes: a horizontal groove 110, a first refractory baffle 120, and a second refractory baffle 130; the horizontal groove 110 is connected between the main trough 310 and the slag trough 320; the main trough 310 is connected to the blast furnace 330; the slag trough 320 is connected to the punching box 340. Figure 2 is a schematic functional structure diagram of a blast furnace slag granulation treatment system provided according to an embodiment of the present invention. Refer to Figure 1 and Figure 2 , the blast furnace slag granulation treatment system provided in this embodiment further includes: a hydrogen content detection module 140, a temperature detection module 150, a flow rate detection module 160, and a control module 170.

[0052] The hydrogen content detection module 140 is used to detect the hydrogen content in the punching box 340; the temperature detection module 150 is used to detect the first temperature of the slag and the second temperature of the slag flushing water; the flow rate detection module 160 is used to detect the first flow rate of the slag and the second flow rate of the slag flushing water in the horizontal groove 110; the control module 170 is connected to the hydrogen content detection module 140, the temperature detection module 150 and the flow rate detection module 160. The control module 170 is used to determine the energy loss coefficient according to the first temperature, the second temperature, the first flow rate and the second flow rate, and control the first refractory baffle 120 and / or the second refractory baffle 130 to be located in the horizontal groove 110 according to the hydrogen content in the punching box 340 when the energy loss coefficient is less than the reference value; wherein, the first refractory baffle 120 and the second refractory baffle 130 located in the horizontal groove 110 are used to block the flow of the slag in the horizontal groove 110 to the slag ditch 320.

[0053] Specifically, continuing to refer to Figure 1 , the blast furnace slag granulation treatment system provided in this embodiment may further include a main trough 310, a slag ditch 320, a blast furnace 330, a punching box 340, a slag skimmer 360, a cylinder push rod 370, a valve 380 and an exhaust duct 390. After the taphole of the blast furnace 330 is opened, the molten iron and slag mixture flows from the blast furnace 330 into the main trough 310, and the slag flows from the slag notch 350 into the horizontal groove 110, and the molten iron separated from the slag flows towards the slag skimmer 360. River sand 351 is filled on both sides of the slag notch 350. The filling of the river sand 351 can make the slag flow into the horizontal groove 110 in an aggregated manner, and improve the problem of slag overflow caused by the slag flowing towards both sides of the horizontal groove 110.

[0054] The horizontal groove 110 in this embodiment is horizontally placed, which is more conducive to daily sampling of the closed slag ditch (environmental protection requirements), observing the fluidity of the slag, and also convenient for measuring the liquid level height of the slag in the horizontal groove 110, the first flow rate of the slag and the first temperature of the slag. The slag ditch 320 can be inclined so that the slag can quickly flow into the punching box 340. The width of the horizontal groove 110 is 100 mm to 200 mm wider than the width of the slag ditch 320, and the distance from the center line of the slag ditch 320 to both sides of the horizontal groove 110 is equal.

[0055] The widths of the first refractory baffle 120 and the second refractory baffle 130 can be equal to the width of the horizontal trench 110. Both the first refractory baffle 120 and the second refractory baffle 130 are cast with refractory materials, and the middle parts of the first refractory baffle 120 and the second refractory baffle 130 are supported by cast iron plates. The first refractory baffle 120 and the second refractory baffle 130 can be pushed by the cylinder push rod 370. The control module 170 can control the working state of the cylinder push rod 370 to control the first refractory baffle 120 and the second refractory baffle 130 to be located in the horizontal trench 110, or can also control the first refractory baffle 120 and the second refractory baffle 130 to withdraw from the horizontal trench 110. When the first refractory baffle 120 or the second refractory baffle 130 is located in the horizontal trench 110, the amount of slag flowing into the punching box 340 in the horizontal trench 110 can be reduced. When the first refractory baffle 120 and the second refractory baffle 130 are both located in the horizontal trench 110, more slag can be blocked from flowing into the punching box 340, improving the blocking effect.

[0056] The hydrogen content detection module 140 can be located inside the punching box 340 for real-time dynamic detection of the hydrogen content inside the punching box 340 during the slag flushing process. An air extraction pipeline 390 is installed inside the punching box 340. The diameter of the air extraction pipeline 390 can be 800 mm to 1000 mm, and the valve 380 connected to the air extraction pipeline 390 can adopt pneumatic control.

[0057] The temperature detection module 150 can include a first temperature detection unit and a second temperature detection unit. The first temperature detection unit can be set in the horizontal trench 110 for real-time detection of the first temperature of the slag in the horizontal trench 110, and the second temperature detection unit can be located inside the punching box 340 for real-time detection of the second temperature of the slag flushing water in the punching box 340.

[0058] Before opening the iron notch of the blast furnace 330, start the slag flushing pump first, and high-pressure and high-speed slag flushing water enters the punching box 340. After the iron notch of the blast furnace 330 is opened, the blast furnace 330 discharges slag and iron. After the slag reacts with the slag flushing water, the high-temperature slag will increase the temperature of the slag flushing water and cause part of the slag flushing water in the punching box 340 to evaporate into steam. The energy loss coefficient represents the part of the heat of the slag converted into steam during the water quenching process and the heat energy lost during the process of heating the slag flushing water. The energy loss coefficient represents the level of energy conversion during the water quenching process of the slag and the slag flushing water. The specific calculation method of the energy loss coefficient can be: Among them, is the energy loss coefficient, C1 is the specific heat capacity of water, M1 is the flow rate of slag flushing water, t2 is the temperature of the slag flushing water after mixing with the slag, t1 is the temperature of the slag flushing water before and after mixing with the slag, M3 is the amount of water vapor in the flushing box 340, C2 is the specific heat capacity of the slag, M2 is the flow rate of the slag, t3 is the temperature of the slag, that is, the first temperature. t1 and t2 are the temperatures of the slag flushing water, both are the second temperature, but the second temperature at different times. M1 can be calculated through the second flow rate, and M2 can be calculated through the liquid level height of the slag in the horizontal groove 110 and the first flow rate of the slag. M3 is the amount of slag flushing water generating steam, which is basically equal to the makeup water volume in the flushing box 340.

[0059] There is molten iron in the slag. The reaction between the liquid high-temperature molten iron and water generates hydrogen, which requires absorbing a large amount of heat energy. The heat energy is converted into hydrogen energy. Because the specific heat capacity of hydrogen is much larger than that of iron and the metal elements in the slag, it causes less heat energy conversion during the slag flushing process. When the energy loss coefficient becomes smaller and is less than the reference value, the control module 170 can determine that there is some molten iron in the slag, where the reference value represents the energy loss coefficient after the reaction between the slag without molten iron and the slag flushing water.

[0060] The molten iron in the slag enters the flushing box 340 and reacts with the slag flushing water in the flushing box 340 to generate hydrogen. To avoid more molten iron flowing into the flushing box 340 and reacting with the slag flushing water in the flushing box 340 to generate more hydrogen, after the control module 170 detects that there is molten iron in the slag, it controls the first refractory baffle 120 and / or the second refractory baffle 130 to be located in the horizontal groove 110 according to the hydrogen content in the flushing box 340. Exemplarily, when the hydrogen content is low, the control module 170 can control the first refractory baffle 120 or the second refractory baffle 130 to be located in the horizontal groove 110. When the hydrogen content is high, the control module 170 can control the first refractory baffle 120 and the second refractory baffle 130 to be located in the horizontal groove 110 simultaneously. After the first refractory baffle 120 and / or the second refractory baffle 130 are located in the horizontal groove 110, the slag flow rate in the horizontal groove 110 will decrease. When the slag flow rate in the horizontal groove 110 decreases, the slag liquid level in the main groove 310 will rise, and the flow rate of the upper-layer slag in the main groove 310 will become slower, thereby improving the slag-iron separation effect in the main groove 310, reducing the flow of molten iron to the horizontal groove 110, making the hydrogen content in the flushing box 340 smaller, and increasing the recovery rate of molten iron. In addition, after the flow of molten iron to the slag ditch 320 decreases, the water quenching effect of the water slag will be improved, and the quality of the water slag can be improved.

[0061] This embodiment provides a blast furnace slag treatment system. A horizontal channel is provided in the blast furnace slag treatment system. The horizontal channel is connected between the main channel and the slag channel. The setting of the horizontal channel facilitates the temperature detection module to detect the first temperature of the slag and also facilitates the flow rate detection module to detect the first flow rate of the slag. The temperature detection module is also used to detect the second temperature of the slag flushing water, and the flow rate detection module is also used to detect the second flow rate of the slag flushing water. The hydrogen content detection module can detect the hydrogen content in the punching box. The control module can determine the energy loss coefficient according to the first temperature, the second temperature, the first flow rate and the second flow rate. When the energy loss coefficient is less than the reference value, the control module can determine that molten iron flows into the punching box, and hydrogen is generated after the molten iron reacts with the slag flushing water in the punching box. The control module can control the first refractory baffle and / or the second refractory baffle to be located in the horizontal channel according to the hydrogen content in the punching box, so as to reduce the amount of slag with molten iron flowing into the punching box, thereby improving the water quenching effect of the granulated slag. In summary, the blast furnace slag treatment system provided by this embodiment can greatly reduce the waste caused by the molten iron flowing into the punching box, improve the detonation phenomenon in the punching box, increase the molten iron recovery rate, and can also improve the water quenching effect of the granulated slag and improve the quality of the granulated slag.

[0062] Optionally, continue to refer to Figure 1 and Figure 2 , the control module 170 is specifically configured to control the first refractory baffle 120 to be located in the horizontal channel 110 when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box 340 is greater than the first set value, and control the first refractory baffle 120 to exit the horizontal channel 110 and control the second refractory baffle 130 to be located in the horizontal channel 110 when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box 340 is greater than the second set value; control the first refractory baffle 120 and the second refractory baffle 130 to be both located in the horizontal channel 110 when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box 340 is greater than the third set value; wherein, the position of the first refractory baffle 120 in the horizontal channel 110 is closer to the connection of the horizontal channel 110 and the main channel 310 than the position of the second refractory baffle 130 in the horizontal channel 110; the first set value is less than the second set value, and the second set value is less than the third set value; the control module 170 is further configured to control the second refractory baffle 130 to exit the horizontal channel 110 when the first refractory baffle 120 and the second refractory baffle 130 are both located in the horizontal channel 110 and the energy loss coefficient is less than the reference value and the energy loss coefficient is gradually increasing, and control the first refractory baffle 120 to exit the horizontal channel 110 when the energy loss coefficient is equal to the reference value and the first refractory baffle 120 is located in the horizontal channel 110.

[0063] Specifically, the first set value can be 1%, the second set value can be 2%, and the third set value can be 3%. The upper limit of the hydrogen content in the punching box 340 is 3.5%. In this embodiment, setting the third set value to be less than 3.5% can prevent a large degree of detonation in the punching box 340 when the hydrogen content reaches 3.5% and then controlling the first refractory baffle 120 and the second refractory baffle 130 to be located in the horizontal groove 110.

[0064] Compared with the distance between the second refractory baffle 130 and the slag notch 350, the distance between the first refractory baffle 120 and the slag notch 350 is smaller. Since the distance between the second refractory baffle 130 and the slag notch 350 is relatively far, when only the second refractory baffle 130 is located in the horizontal groove 110, part of the slag can stay in the horizontal groove 110, which can improve the problem of slag overflowing from the slag notch 350 when the slag content is too high.

[0065] The hydrogen content, the first temperature, the second temperature, the first flow rate, and the second flow rate will change dynamically in real time. Therefore, the energy loss coefficient will also change dynamically in real time. The control module 170 will control the positions of the first refractory baffle 120 and the second refractory baffle 130 in real time according to the energy loss coefficient and the hydrogen content to control the amount of molten iron flowing into the punching box 340, and finally reduce the amount of molten iron mixed into the slag.

[0066] When the energy loss coefficient is less than the reference value and the hydrogen content in the punching box 340 is greater than the third set value, while controlling the first refractory baffle and the second refractory baffle to be located in the horizontal groove, the control module can also control the valve 380 to open to quickly release the hydrogen in the punching box 340.

[0067] After the first refractory baffle 120 and / or the second refractory baffle 130 are located in the horizontal groove 110 for a period of time, the liquid level in the main trough 310 can rise, and more molten iron can flow from the main trough 310 to the skimmer 360, thereby reducing the amount of molten iron in the slag. Therefore, when the control module 170 detects an increase in the energy loss coefficient and the energy loss coefficient is less than the reference value when the first refractory baffle 120 and the second refractory baffle 130 are both located in the horizontal groove 110, it controls the first refractory baffle 120 and the second refractory baffle 130 to gradually withdraw from the horizontal groove 110 so that the slag can flow into the punching box 340 normally.

[0068] Optionally, continue to refer to Figure 1 and Figure 2, the blast furnace slag treatment system provided by this embodiment further includes a gas pressure detection module 180 and an exhaust module 190; the gas pressure detection module 180 is used to detect the gas pressure in the punching box 340; the exhaust module 190 is used to release the gas pressure in the punching box 340; the control module 170 is connected to the gas pressure detection module 180 and the exhaust module 190, and the control module 170 is further configured to control the exhaust module 190 to open when the energy loss coefficient is greater than the reference value and the gas pressure in the punching box 340 is greater than the fourth set value, and to control the first refractory baffle 120 to be located in the horizontal groove 110 when the energy loss coefficient is higher than the reference value and the gas pressure in the punching box 340 is greater than the fifth set value, and to control both the first refractory baffle 120 and the second refractory baffle 130 to be located in the horizontal groove 110 when the energy loss coefficient is higher than the reference value and the gas pressure in the punching box 340 is greater than the sixth set value, where the fourth set value is less than the fifth set value, and the fifth set value is less than the sixth set value.

[0069] Specifically, the exhaust module 190 includes a valve 380 and an exhaust duct 390. The control module 170 controls the exhaust module 190 to open, that is, controls the valve in the exhaust module 190 to open, so as to reduce the gas pressure in the punching box 340. The gas in the punching box 340 includes hydrogen. After the exhaust module 190 is opened, the hydrogen content in the punching box 340 is reduced, thereby improving the explosion problem caused by too high hydrogen content in the punching box 340.

[0070] The fourth set value can be 5 kPa, the fifth set value can be 10 kPa, and the sixth set value can be 50 kPa. When the gas pressure in the punching box 340 is greater than the fourth set value but not greater than the fifth set value, the control module 170 can only control the exhaust module 190 to open, and it is not necessary to place the first refractory baffle 120 and the second refractory baffle 130 in the horizontal groove 110. When the gas pressure in the punching box 340 is greater than the fifth set value but not greater than the sixth set value, the control module 170 can control the first refractory baffle 120 to be located in the horizontal groove 110 and control the exhaust module 190 to open, so as to reduce the amount of slag (slag with molten iron) flowing into the punching box 340, and further reduce the amount of molten iron flowing into the punching box 340, and finally reduce the hydrogen content and gas pressure in the punching box 340. When the gas pressure in the punching box 340 is greater than the sixth set value, the control module 170 controls both the first refractory baffle 120 and the second refractory baffle 130 to be located in the horizontal groove 110 and controls the exhaust module 190 to open, which can further reduce the amount of molten iron flowing into the punching box 340, and finally reduce more hydrogen content and gas pressure in the punching box 340.

[0071] Optionally, the control module is further configured to determine the flow rate of the slag according to the first flow rate, and control the first refractory baffle to be located in the horizontal groove when the flow rate of the slag exceeds the seventh set value.

[0072] Specifically, the seventh set value can be the normal slag flow rate. When the slag flow rate is too large, the control module controls the first refractory baffle to be located in the horizontal groove to reduce the slag flow rate, thereby reducing the molten iron carried in the slag.

[0073] Optionally, the energy loss coefficient is determined according to the following formula:

[0074]

[0075] Wherein, is the energy loss coefficient, C1 is the specific heat capacity of water, M1 is the flow rate of the slag flushing water, t2 is the second temperature of the slag flushing water after mixing with the slag, t1 is the second temperature of the slag flushing water before mixing with the slag, M3 is the amount of water vapor in the punching box, C2 is the specific heat capacity of the slag, M3 is the slag flow rate, and t3 is the first temperature of the slag.

[0076] Specifically, under normal circumstances, the pressure of the slag flushing water is fixed, and the flow rate of the slag flushing water is basically stable. The slag generated during the internal smelting of the blast furnace is in a relatively balanced state of generation and discharge during the smelting process. The longer the slag discharge time, the greater the amount of slag quenched by reacting with the slag flushing water, the more heat generated by the reaction, the greater the increase in the temperature of the slag flushing water, the more steam generated, and the greater the consumption of the slag flushing water. Both t2 and t3 are dynamically changing in real time, thereby making the energy loss coefficient dynamically change.

[0077] Optionally, continuing to refer to Figure 1 , the thickness range of the first refractory baffle 120 is 10 mm to 50 mm, and the height range of the first refractory baffle 120 is 20 mm to 40 mm; the thickness range of the second refractory baffle 130 is 10 mm to 50 mm, and the height range of the second refractory baffle 130 is 30 mm to 60 mm; the distance range of the first refractory baffle 120 from the slag notch 350 is 10 mm to 20 mm; the distance range of the second refractory baffle 130 from the slag notch 350 is 80 mm to 100 mm. Such settings can improve the effect of the first refractory baffle 120 and the second refractory baffle 130 in blocking the slag.

[0078] Specifically, the thickness of the first refractory baffle 120 can be 50 mm, the height is 20 mm, the thickness of the second refractory baffle 130 can be 50 mm, and the height is 40 mm.

[0079] It should be noted that the distance of the first refractory baffle 120 from the slag notch 350 represents the distance of the first refractory baffle 120 from the slag notch 350 when the first refractory baffle 120 is located in the horizontal groove 110, and the distance of the second refractory baffle 130 from the slag notch 350 represents the distance of the second refractory baffle 130 from the slag notch 350 when the second refractory baffle 130 is located in the horizontal groove 110.

[0080] Optionally, the length of the horizontal groove ranges from 300 mm to 500 mm, and the width of the horizontal groove ranges from 300 mm to 400 mm. Such a setting is beneficial to the sampling of slag and the monitoring of the slag flow rate, and can also avoid the problem that the slag is not easy to flow into the punching box due to the too long length of the slag. The width of the horizontal groove is 100 mm to 200 mm wider than the width of the slag notch. Such a setting can cause the slag passing through the slag notch to converge into the horizontal groove.

[0081] Optionally, the horizontal groove includes a first groove and a second groove; the first groove is used to accommodate the first refractory baffle, and the second groove accommodates and fixes the second refractory baffle; the depth of the first groove is less than the height of the first refractory baffle; the depth of the second groove is less than the height of the second refractory baffle.

[0082] Specifically, when the control module controls the first refractory baffle to be located in the horizontal groove, the first refractory baffle is placed in the first groove. When the control module controls the second refractory baffle to be located in the horizontal groove, the second refractory baffle is placed in the second groove. The settings of the first groove and the second groove can make the first refractory baffle and the second refractory baffle more stable in the horizontal groove.

[0083] Based on any of the above embodiments, optionally, the depth range of the first groove includes 8 mm to 10 mm; the depth range of the second groove includes 8 mm to 10 mm; the width of the first groove is 3 mm to 10 mm larger than the thickness of the first refractory baffle; the width of the second groove is 3 mm to 10 mm larger than the thickness of the second refractory baffle.

[0084] Specifically, the depth of the first groove can be equal to the depth of the second groove. In this embodiment, setting the width of the first groove to be 3 mm to 10 mm larger than the thickness of the first refractory baffle can make it easier to place the first refractory baffle in the first groove. Setting the width of the second groove to be 3 mm to 10 mm larger than the thickness of the second refractory baffle can make it easier to place the second refractory baffle in the second groove.

[0085] It should be noted that the width direction of the first groove is the same as the thickness direction of the first refractory baffle, and the width direction of the second groove is the same as the thickness direction of the second refractory baffle.

[0086] According to incomplete statistics, by using the blast furnace slag treatment system provided in this embodiment, for a single blast furnace at the 3000m 3 level, more than 500 tons of iron can be effectively recovered every year. It can be seen that the blast furnace slag treatment system provided in this embodiment greatly reduces the waste caused by the molten iron entering the slag ditch and increases the molten iron recovery rate.

[0087] This embodiment also provides a method for treating blast furnace slag. The method for treating blast furnace slag is applied to the blast furnace slag treatment system provided in any embodiment of the present invention;

[0088] Figure 3 is a schematic flow chart of a blast furnace slag treatment method provided according to an embodiment of the present invention. Referring to Figure 3 , the blast furnace slag treatment method provided in this embodiment includes:

[0089] S110. The hydrogen content detection module detects the hydrogen content in the flushing box; the temperature detection module detects the first temperature of the slag and the second temperature of the slag flushing water; the flow rate detection module detects the first flow rate of the slag in the horizontal trench and the second flow rate of the slag flushing water.

[0090] S120. The control module determines the energy loss coefficient according to the first temperature, the second temperature, the first flow rate and the second flow rate, and controls the first refractory baffle and / or the second refractory baffle to be located in the horizontal trench according to the hydrogen content in the flushing box when the energy loss coefficient is less than the reference value; wherein, the first refractory baffle and the second refractory baffle located in the horizontal trench are used to block the flow of the slag in the horizontal trench to the slag trench.

[0091] The blast furnace slag treatment method provided in this embodiment has corresponding beneficial effects with the blast furnace slag treatment system provided in any embodiment of the present invention. For the technical details not elaborated in this embodiment, please refer to the blast furnace slag treatment system provided in any embodiment of the present invention.

[0092] It should be understood that various forms of the processes shown above can be used, reordering, adding or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0093] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blast furnace slag granulation treatment system, characterized in that, Comprising: A horizontal groove, a hydrogen content detection module, a temperature detection module, a flow rate detection module, a control module, a first refractory baffle, and a second refractory baffle; The horizontal groove is connected between the main groove and the slag groove; the main groove is connected to the blast furnace; the slag groove is connected to the punching box; The hydrogen content detection module is used to detect the hydrogen content in the punching box; The temperature detection module is used to detect the first temperature of the slag and the second temperature of the slag flushing water; The flow rate detection module is used to detect the first flow rate of the slag and the second flow rate of the slag flushing water in the horizontal groove; The control module is connected to the hydrogen content detection module, the temperature detection module, and the flow rate detection module. The control module is used to determine an energy loss coefficient according to the first temperature, the second temperature, the first flow rate, and the second flow rate, and control the first refractory baffle and / or the second refractory baffle to be located in the horizontal groove according to the hydrogen content in the punching box when the energy loss coefficient is less than a reference value; wherein, the first refractory baffle and the second refractory baffle located in the horizontal groove are used to block the slag in the horizontal groove from flowing to the slag groove; wherein, the energy loss coefficient represents the magnitude of the energy conversion level during the water quenching process of the slag and the slag flushing water.

2. The blast furnace slag granulation treatment system according to claim 1, characterized in that, Specifically, the control module is used to control the first refractory baffle to be located in the horizontal groove when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a first set value, control the first refractory baffle to withdraw from the horizontal groove and control the second refractory baffle to be located in the horizontal groove when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a second set value; control both the first refractory baffle and the second refractory baffle to be located in the horizontal groove when the energy loss coefficient is less than the reference value and the hydrogen content in the punching box is greater than a third set value; wherein, the position of the first refractory baffle in the horizontal groove is closer to the connection between the horizontal groove and the main groove than the position of the second refractory baffle in the horizontal groove; the first set value is less than the second set value, and the second set value is less than the third set value; the control module is further used to control the second refractory baffle to withdraw from the horizontal groove when both the first refractory baffle and the second refractory baffle are located in the horizontal groove and the energy loss coefficient is less than the reference value and the energy loss coefficient is gradually increasing, and control the first refractory baffle to withdraw from the horizontal groove when the energy loss coefficient is equal to the reference value and the first refractory baffle is located in the horizontal groove.

3. The blast furnace slag granulation treatment system according to claim 1, wherein, Further comprising: A gas pressure detection module and an exhaust module; The gas pressure detection module is used to detect the gas pressure in the punching box; The exhaust module is used to release the gas pressure in the punching box; The control module is connected to the air pressure detection module and the exhaust module. The control module is further configured to control the exhaust module in the punching box to open when the energy loss coefficient is greater than the reference value and the gas pressure in the punching box is greater than a fourth set value, to control the first refractory baffle to be located in the horizontal groove when the energy loss coefficient is higher than the reference value and the gas pressure in the punching box is greater than a fifth set value, and to control both the first refractory baffle and the second refractory baffle to be located in the horizontal groove when the energy loss coefficient is higher than the reference value and the gas pressure in the punching box is greater than a sixth set value, wherein the fourth set value is less than the fifth set value, and the fifth set value is less than the sixth set value.

4. The blast furnace slag granulation treatment system according to claim 1, characterized in that, The control module is further configured to determine the flow rate of the slag according to the first flow rate, and to control the first refractory baffle to be located in the horizontal groove when the flow rate of the slag exceeds a seventh set value.

5. The blast furnace slag granulation treatment system according to claim 1, characterized in that, The energy loss coefficient is determined according to the following formula: Among them, is the energy loss coefficient, C1 is the specific heat capacity of water, M1 is the flow rate of the slag flushing water, t2 is the second temperature of the slag flushing water after mixing with the slag, t1 is the second temperature of the slag flushing water before mixing with the slag, M3 is the amount of water vapor in the flushing box, C2 is the specific heat capacity of the slag, M2 is the flow rate of the slag, and t3 is the first temperature of the slag.

6. The blast furnace slag granulation treatment system according to claim 1, wherein The thickness range of the first refractory baffle is 10 mm to 50 mm, and the height range of the first refractory baffle is 20 mm to 40 mm; The thickness range of the second refractory baffle is 10 mm to 50 mm, and the height range of the second refractory baffle is 30 mm to 60 mm; The distance range of the first refractory baffle from the slag notch is 10 mm to 20 mm; The distance range of the second refractory baffle from the slag notch is 80 mm to 100 mm.

7. The blast furnace slag granulation treatment system according to claim 1, characterized in that, The length range of the horizontal groove is 300 mm to 500 mm, and the width range of the horizontal groove is 300 mm to 400 mm; The width of the horizontal groove is 100 mm to 200 mm wider than the width of the slag notch.

8. The blast furnace slag granulation treatment system according to any one of claims 1-7, characterized in that, The horizontal groove includes a first groove and a second groove; The first groove is used to accommodate the first refractory baffle, and the second groove is used to accommodate and fix the second refractory baffle; The depth of the first groove is less than the height of the first refractory baffle; the depth of the second groove is less than the height of the second refractory baffle.

9. The blast furnace slag granulation treatment system according to claim 8, characterized in that, The depth range of the first groove includes 8 mm to 10 mm; the depth range of the second groove includes 8 mm to 10 mm; The width of the first groove is 3 mm to 10 mm larger than the thickness of the first refractory baffle; The width of the second groove is 3 mm to 10 mm larger than the thickness of the second refractory baffle.

10. A method for treating blast furnace slag, characterized in that, Applied to the blast furnace slag treatment system according to any one of claims 1-9; The blast furnace slag treatment method includes: The hydrogen content detection module detects the hydrogen content in the punching box; the temperature detection module detects the first temperature of the slag and the second temperature of the slag flushing water; the flow rate detection module detects the first flow rate of the slag and the second flow rate of the slag flushing water in the horizontal groove; The control module determines an energy loss coefficient based on the first temperature, the second temperature, the first flow rate, and the second flow rate, and controls the first refractory baffle and / or the second refractory baffle to be located in the horizontal trench according to the hydrogen content in the punching box when the energy loss coefficient is less than a reference value; wherein, the first refractory baffle and the second refractory baffle located in the horizontal trench are used to block the slag in the horizontal trench from flowing into the slag trench.

Images