A device for real-time measurement and control of high-temperature liquid molten slag flow rate with side discharge.

Abstract

This invention discloses a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side-discharge. A first-stage slag bag is connected to a granulation device via a second-stage slag bag. The second-stage slag bag is connected to a flow measurement device for monitoring the flow rate of high-temperature liquid molten slag within both the first and second-stage slag bags. Flow control devices are installed between the first and second-stage slag bags, and between the second-stage slag bag and the granulation device, to control the flow rate of the high-temperature liquid molten slag. This invention solves the problem of difficulty in real-time monitoring of the molten slag storage in the liquid slag buffer device during the dry granulation process of liquid molten slag due to intermittent slag discharge from the blast furnace.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature liquid molten slag waste heat recovery technology, specifically relating to a device for real-time measurement and control of high-temperature liquid molten slag flow rate with side slag discharge. Background Technology

[0002] The smelting of pig iron also produces blast furnace slag, which contains a huge amount of heat. The tapping temperature of blast furnace slag is generally between 1400 and 1550℃, and each ton of slag contains (1260–1880) × 10³ kJ of sensible heat, equivalent to 60 kg of standard coal. Under current ironmaking technology, 0.3 tons of blast furnace slag are produced as a byproduct of every ton of pig iron produced. Based on a pig iron production of 771 million tons, this translates to approximately 231 million tons of blast furnace slag, with a sensible heat equivalent to approximately 13.8798 million tons of standard coal.

[0003] Dry slag pit cooling and water flushing are currently the most common methods for treating blast furnace slag. The dry slag pit method generates a large amount of water vapor during cooling, while also releasing significant amounts of H2S and SO2 gases, which corrode buildings, damage equipment, and deteriorate the working environment. The water flushing method wastes a large amount of water resources, generates harmful gases such as SO2 and H2S, and cannot effectively recover the high-quality waste heat resources contained in the high-temperature molten slag. Currently, these methods are no longer adequate to meet the urgent needs of energy conservation and emission reduction in the steel industry.

[0004] Compared to the water-based slag method, dry slag treatment technology not only saves a significant amount of water resources but also releases almost no harmful gases such as H2S and SO2, thus exhibiting significant economic and environmental advantages and attracting considerable attention within the industry. In the dry centrifugal granulation process, high-temperature, high-viscosity slag is ejected from the surface of a high-speed rotating disc, forming droplets in the air. These droplets then undergo intense direct heat exchange with the heat transfer medium in the space, causing the droplet temperature to decrease and a phase change to occur on their surface, forming a solidified layer. As the temperature further decreases, the droplets gradually transform into small solid particles. Since blast furnace slag discharge is mostly intermittent, a high-temperature buffer device is required to ensure the stable operation of the dry centrifugal granulation system. Therefore, a liquid molten slag buffer device with real-time flow measurement technology is needed to ensure the safe and stable operation of the entire system.

[0005] In summary, there is an urgent need for a new device for real-time measurement and control of the flow rate of high-temperature liquid molten slag. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side slag discharge, in order to solve the technical problem that it is difficult to monitor the slag storage of the liquid molten slag buffer device in real time due to the intermittent slag discharge of the blast furnace during the current dry granulation process of liquid molten slag.

[0007] The present invention adopts the following technical solution:

[0008] A real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side discharge includes a first-stage slag pot, which is connected to a granulation device via a second-stage slag pot. The second-stage slag pot is connected to a flow measurement device for monitoring the flow rate of high-temperature liquid molten slag in both the first-stage and second-stage slag pots. Flow control devices are installed between the first-stage and second-stage slag pots, and between the second-stage slag pot and the granulation device. The flow control devices are used to control the flow rate of the high-temperature liquid molten slag.

[0009] Specifically, the flow control device includes a sizing nozzle, which is respectively located between the first-stage slag bag and the second-stage slag bag, and between the second-stage slag bag and the granulation device.

[0010] Furthermore, a flow control plug is installed at the sizing nozzle between the second-stage slag bag and the first-stage slag bag, and one end of the flow control plug is connected to a stepper motor.

[0011] Furthermore, the stepper motor is located on the outside of the second-stage slag bag.

[0012] Furthermore, the flow control plug rod includes a plug rod rod, one end of which is connected to a stepper motor, and the other end is provided with a plug rod head, which is located at the plug rod operation port.

[0013] Furthermore, the stopper head is fitted with a sealing cover.

[0014] Furthermore, the sizing nozzle between the second-stage slag bag and the granulation unit is located on the lower side of the second-stage slag bag.

[0015] Specifically, the flow measurement device includes a weight sensor, which is located at the bottom of the second-quarter slag bag and electrically connected to the data processing equipment.

[0016] Specifically, the volume of the second-stage slag bag is smaller than that of the first-stage slag bag.

[0017] Specifically, the sidewall of the second-stage slag bag is sealed to the first-stage slag bag.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] This invention discloses a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side slag discharge. The molten slag flows into a first slag bag through a slag ditch. The side of the first slag bag is connected to a second slag bag. The bottom of the second slag bag is equipped with a slag discharge pipe, through which the molten slag enters the granulation bin. The first slag bag buffers the molten slag intermittently discharged from the blast furnace, while the second slag bag regulates the flow rate of molten slag entering the granulation bin, thus solving the problem of matching the intermittent slag discharge of the blast furnace with the operation of the waste heat recovery device.

[0020] Furthermore, a fixed-sizing nozzle and a flow control plug are provided at the connection between the side of the first slag bag and the second slag bag for emergency flow control; a fixed-sizing nozzle and a flow control plug are provided at the bottom of the second slag bag; by controlling the gap between the plug and the fixed-sizing nozzle, the flow rate can be controlled in real time, ensuring flow stability and achieving safe and stable operation of the system.

[0021] Furthermore, a sizing nozzle and a flow control plug are provided at the connection between the first slag bag and the second slag bag for emergency flow control; a sizing nozzle and a flow control plug are provided at the bottom of the second slag bag; the flow rate is controlled in real time by controlling the gap between the plug and the sizing nozzle. Furthermore, a stepper motor is used to control the raising and lowering of the plug, ensuring stable flow and achieving safe and stable operation of the system.

[0022] Furthermore, a stepper motor is positioned outside the second-stage slag bag to control the two-stage stopper rods.

[0023] Furthermore, while achieving the purpose of flow control with the stopper rod, the sealing cover isolates the high-temperature molten slag from contact with the outside world, providing heat insulation and protecting the safety of operators and equipment.

[0024] Furthermore, in order to facilitate the smooth flow of high-temperature molten slag by utilizing gravity, it is placed alongside the granulation device.

[0025] Furthermore, a device is installed at the bottom of the second slag pot to calculate the slag flow rate by weighing the second slag pot; connected to a data processing device, the weighing data can be obtained in real time to calculate the slag flow rate.

[0026] Furthermore, the first slag bag mainly serves as a slag buffer, so it has a larger volume. The second slag bag serves as a flow control device. Reducing the volume of the second slag bag can save on the cost of weighing equipment.

[0027] Furthermore, to ensure the safe operation of the equipment and prevent molten slag from overflowing or the equipment from overheating.

[0028] In summary, this invention overcomes the practical limitations of discontinuous slag discharge from blast furnaces. The molten slag discharged from the blast furnace slag discharge channel flows into the first slag ladle, which acts as a buffer, storing the intermittently discharged molten slag. Combined with the second slag ladle and a matching flow control device and weighing equipment, it indirectly measures the flow rate, ensuring the stability of subsequent equipment operation regardless of the blast furnace slag discharge flow rate.

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] The components include: 1. First-stage slag bag; 2. Stepper motor; 3. Flow control plug; 4. Sizing nozzle; 5. Weight sensor; 6. Second-stage slag bag. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0039] This invention provides a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side slag discharge. The flow rate of molten slag flowing out of the sizing nozzle is calculated by taking into account the weight and volume of the two-stage slag bag and the size of the sizing nozzle. This solves the problem that it is difficult to monitor the molten slag storage in the liquid molten slag buffer device in real time due to the intermittent slag discharge of the blast furnace during the dry granulation of liquid molten slag.

[0040] Please see Figure 1 The present invention discloses a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side discharge, comprising two-stage slag bags, a flow control device and a flow measurement device. The two-stage slag bags are connected in sequence and connected to a granulation device via the flow control device. The flow control device is installed inside the two-stage slag bags and is used to monitor the flow rate of high-temperature liquid molten slag from the slag bags to the granulation device.

[0041] The flow control device includes a flow control plug 3 and a sizing nozzle 4. The two-stage slag bag includes a first-stage slag bag 1 and a second-stage slag bag 6. The first-stage slag bag 1 and the second-stage slag bag 6, as well as the second-stage slag bag 6 and the granulation device, are connected by a sizing nozzle 4. The flow control plug 3 is installed inside the second-stage slag bag 6. One end is connected to the sizing nozzle 4 connected to the first-stage slag bag 1, and the other end is connected to a stepper motor 2 installed outside the second-stage slag bag 6. The stepper motor 2 controls the horizontal movement of the flow control plug 3 to control the liquid level of the second-stage slag bag 6.

[0042] The flow measurement device includes a weight sensor 5 and a data processing device. The weight sensor 5 is located at the bottom of the second-stage slag bag 6 and is electrically connected to the data processing device to collect data from the second-stage slag bag 6 and send it to the data processing device.

[0043] The probes in the weight sensor 5 are evenly arranged at the bottom of the second-stage slag bag 6 according to the volume, shape, connection method with other devices, and stress conditions of the slag bag, so as to achieve a stable and accurate measurement effect.

[0044] The volume of the second-stage slag bag 6 is smaller than that of the first-stage slag bag 1. The side wall of the second-stage slag bag 6 is sealed to the first-stage slag bag 1. The flow control plug 3 is located at the connection between the second-stage slag bag 6 and the first-stage slag bag 1.

[0045] The lower part of the second-stage slag bag 6 is connected to the granulation device through the corresponding sizing nozzle 4.

[0046] The flow control stopper rod 3 includes a stopper rod rod and a stopper rod head. The stopper rod operating port is located on the sealing cover, the stopper rod rod is located inside the stopper rod operating port, and the end of the stopper rod rod located inside the sealing cover is provided with a stopper rod head.

[0047] The working principle of the high-temperature liquid molten slag flow rate real-time measurement and control device with side slag discharge of the present invention is as follows:

[0048] The system incorporates two-stage slag bags, as well as flow measurement and flow control devices, overcoming the production challenges posed by the discontinuous slag discharge from the blast furnace.

[0049] The molten slag discharged from the blast furnace slag discharge ditch flows into the first slag bag through the slag ditch. The first slag bag acts as a buffer, storing the molten slag intermittently discharged from the blast furnace. Regardless of the blast furnace slag discharge flow rate, it can ensure the stability of the operation of subsequent equipment.

[0050] The first slag bag is connected to the second slag bag on the side. A flow control plug is installed at the connection to control the flow rate and velocity of molten slag from the first slag bag to the second slag bag, so as to ensure a controllable relationship between the amount of molten slag buffered in the first slag bag and the amount of molten slag in the second slag bag.

[0051] The bottom of the second slag pot is equipped with a slag discharge pipe and a matching flow control plug. The molten slag enters the granulation chamber through the slag discharge pipe. The flow rate and velocity of the molten slag entering the granulation chamber are regulated by adjusting the opening of the plug. A weighing device is installed at the bottom of the second slag pot. The flow rate of the molten slag is further calculated by weighing the second slag pot. The weighing data is obtained in real time by connecting to the data processing equipment, and the molten slag flow rate is calculated in real time.

[0052] In summary, the present invention provides a real-time measurement and control device for the flow rate of high-temperature liquid molten slag with side slag discharge, which ensures stable flow rate, realizes safe and stable system operation, solves the problems of excessive and unstable slag flow rate and irregular slag discharge time during intermittent slag discharge in blast furnaces, and addresses the technical difficulties of matching the operation of waste heat recovery devices.

[0053] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A real-time measurement and control device for high-temperature liquid slag flow with side slagging, characterized in that, The application relates to a granulation device for high-temperature liquid slag, which comprises a first-stage slag ladle (1), wherein the first-stage slag ladle (1) is connected with a granulation device through a second-stage slag ladle (6); the second-stage slag ladle (6) is connected with a flow measuring device for monitoring the flow of high-temperature liquid slag in the first-stage slag ladle (1) and the second-stage slag ladle (6); flow control devices are arranged between the first-stage slag ladle (1) and the second-stage slag ladle (6) and between the second-stage slag ladle (6) and the granulation device, and the flow control devices are used for controlling the flow of high-temperature liquid slag. The flow control device comprises a sizing nozzle (4), which is arranged between the first-stage slag ladle (1) and the second-stage slag ladle (6) and between the second-stage slag ladle (6) and the granulation device; a flow control plug rod (3) is arranged at the sizing nozzle (4) between the second-stage slag ladle (6) and the first-stage slag ladle (1); one end of the flow control plug rod (3) is connected with a stepping motor (2), and the stepping motor (2) is arranged outside the second-stage slag ladle (6); the volume of the second-stage slag ladle (6) is smaller than that of the first-stage slag ladle (1); the flow control plug rod (3) comprises a plug rod stem, one end of the plug rod stem is connected with the stepping motor (2), and the other end is provided with a plug rod head; the plug rod head is arranged at a plug rod operating port; the sizing nozzle (4) between the second-stage slag ladle (6) and the granulation device is arranged at the lower side of the second-stage slag ladle (6); and the side wall of the second-stage slag ladle (6) is sealingly connected with the first-stage slag ladle (1). The flow measuring device comprises a weight sensor (5), which is arranged at the bottom of the second-stage slag ladle (6) and is electrically connected with a data processing device.

2. The real time flow measurement and control device for high temperature liquid slag with side deslagging according to claim 1, characterized in that, The plug rod head is externally sleeved with a sealing cover.

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