Rapid sampling device and sampling method for raw material layer granulation quasi-particles of sintering pallet

Abstract

The invention relates to a quick sampling device and a sampling method for raw material layer granulation quasi-particles of a sintering pallet, and belongs to the technical field of iron ore sintering sampling detection. According to the technical scheme, a cold air flow guide pipe is arranged on the central axis in a sampling pipe and upwards penetrates through a round hole in the central axis of a top cover plate of the sampling pipe to enter a space between the top cover plate of the sampling pipe and a top cover; the vortex tube cold air system is connected with a round hole formed in the circumference of the top cover through a metal hose and is communicated with a space between the top cover plate of the sampling tube and the top cover; cold air of-10 DEG C to-40 DEG C provided by the vortex tube cold air system quickly freezes the granulated quasi-particle swarms entering the sampling tube from the sintered raw material layer through the cold air guide tube, and then tensile force is applied to the upper end of the top cover, so that the sampling tube and the quasi-particle swarms in the sampling tube can be quickly taken out from the sintering trolley, and sampling is completed. The problems of complex flow, high cost, large influence on normal production and the like of a traditional sampling method can be avoided, and sampling can be completed at low cost and high efficiency.

Description

Technical Field

[0001] The invention relates to a sintering trolley raw material layer granulation quasi-granule rapid sampling device and a sampling method thereof, belonging to the technical field of iron ore sintering sampling and detection. Background Art

[0002] Sintering is a smelting process in which a series of physical and chemical changes occur in the quasi-particles of the raw material layer under the guidance of surface ignition and ventilation, and the bulk materials are bonded and converted into porous irregular clinker with the help of the local liquid phase generated by the high-temperature combustion zone. This process usually requires the iron ore powder, iron ore powder, flux, and fuel to be stirred and mixed by a primary mixer and a secondary mixer, and then transported to the mixed material bin above the sintering trolley by a belt conveyor. After the granulated quasi-particles are discharged from the bin, they are graded and segregated on the sintering trolley through a distribution device. The basic requirement for sintering machine distribution is that the particle size of the granulated quasi-particles is evenly distributed in the horizontal direction (the width direction of the trolley) of the sintering material layer and segregated in the vertical direction, so that the mixture with large particle size and low carbon content can be distributed as much as possible to the lower part of the material layer, and the mixture with small particle size and high carbon content can be distributed as much as possible to the upper part of the material layer. It is generally believed in the industry that only when the particle size distribution is uniform in the horizontal direction and the segregation distribution is appropriate in the vertical direction can the effective achievement of quality improvement and carbon reduction in thick material layer sintering be guaranteed.

[0003] Scientific and effective sampling and analysis have very important guiding value for the optimization of iron ore sintering production line equipment and process parameters. Chinese patent CN201620215581.5 (a lime powder sampler for sintering production) discloses a system composed of a ash conveying straight pipe, a sampling straight pipe, an electric gate valve and a filter bag to achieve rapid sampling of flux powder in a tank truck, but it is not suitable for sampling particles in the sintering raw material layer. CN201010509675.0 (a method for determining the particle size of sintering mixtures) discloses freezing the sintering mixture samples in a refrigerator after shrinking them, which can solve the problems that the traditional particle size determination method cannot objectively reflect the particle size composition of the mixture under actual production conditions and cannot reasonably evaluate the effect of enhanced mixing granulation. However, it is impossible to quickly sample the sintering raw material layer. The defects of the existing technical sampling method are: the sintering machine is required to be temporarily stopped and large-scale lifting equipment is used during sampling, resulting in a complicated sampling process for the sintering raw material layer and high sampling and detection costs, which will have a greater impact on the sintering quality. Summary of the invention

[0004] The purpose of the present invention is to provide a sintering trolley raw material layer granulation quasi-particle rapid sampling device and a sampling method thereof, which uses the cold air produced by the vortex tube system to realize the rapid sampling operation of the sintering raw material layer granulation quasi-particle group, realizes low-cost and high-efficiency sampling, is conducive to guiding the sintering to increase production, improve quality and reduce consumption, and solves the defects and problems existing in the existing technology.

[0005] The technical solution proposed by the present invention is as follows: A sintering trolley raw material layer granulation quasi-particle rapid sampling device comprises a sampling tube, a granulation quasi-particle group to be sampled, a sampling tube top cover, a top cover, a cold air guide pipe, a vortex tube refrigeration air system and a thermal resistance temperature measurement system. The granulation quasi-particle group to be sampled is located in the sampling tube, a sampling tube top cover is provided on the top of the sampling tube, a top cover is provided on the top cover of the sampling tube, a cold air guide pipe is provided on the central axis of the sampling tube, the cold air guide pipe passes upward through a circular hole on the central axis of the sampling tube top cover and is connected to the sampling tube top cover and the top cover of the sampling tube. The vortex tube refrigeration air system is connected to the circular hole opened on the circumference of the top cover through a metal hose and is thus connected to the space between the top cover plate of the sampling tube and the top cover; a thermal resistor temperature measurement system is arranged outside the sampling tube; the -10°C to -40°C cold air provided by the vortex tube refrigeration air system passes through the cold air guide pipe to quickly freeze the granulation quasi-particle group entering the sampling tube from the sintering raw material layer, and a pulling force is applied at the upper end of the top cover to quickly remove the sampling tube and the quasi-particle group inside it from the sintering trolley to complete the rapid sampling.

[0006] The cold air guide pipe is a ventilation pipe with a cone barrel shape at the end, and a plurality of air permeable slits are evenly opened along the circumference on the pipe wall of the cold air guide pipe.

[0007] The overall shape of the top cover is cylindrical and has an internal thread structure. A circular hole is opened on one side of the bottom of the top cover cylinder. The vortex tube cooling air system is connected to the circular hole through a metal hose and supplies cold air to the cold air guide pipe through the space between the top cover plate of the sampling tube and the top cover. A cylindrical platform is welded to the outside of the cylinder in the center of the top cover, and external force can be applied to the sampling tube through the cylindrical platform.

[0008] The top cover plate of the sampling tube is connected to and seals the top of the sampling tube. The top cover plate of the sampling tube is in the shape of a circular boss. The outer diameter of the lower part of the circular boss is equivalent to the inner diameter of the sampling tube, and is engaged with the inner thread of the sampling tube through an external thread structure; the external thread structure of the upper part of the circular boss of the top cover plate of the sampling tube is engaged with the inner thread structure of the top cover; a circular through hole is opened on the central axis of the top cover plate of the sampling tube, and the cold air guide tube can pass through the circular through hole and be engaged with the top cover plate of the sampling tube.

[0009] A method for rapid sampling of quasi-granules of granulation in a raw material layer of a sintering trolley is provided, which rapidly cools the quasi-granules of granulation entering a sampling tube of the raw material layer of the sintering trolley, and realizes rapid sampling of quasi-granules of granulation in the raw material layer of the sintering machine under the action of the force applied by the upper end of the top cover; the method comprises the following steps: The sampling tube is quickly pressed into the raw material layer by applying pressure through the top cover. When the sampling tube is pressed into the material layer to a depth of 0.8 to 0.9 times the height of the sintering trolley, the granulated quasi-particles entering the sampling tube in the sintered raw material layer are quickly frozen with the help of -10°C to -40°C cold air provided by the vortex tube refrigeration air system and the cold air guide tube. At the same time, a thermal resistor temperature measurement system is used to detect in real time the freezing effect of the granulated quasi-particle group in the local area at the bottom of the sampling tube. When the detected temperature in the bottom area of ​​the sampling tube is between -2°C and -5°C, a pulling force is applied through the top cover to quickly remove the sampling tube and the quasi-particle group inside it from the material layer, thereby completing the rapid sampling operation of the quasi-particles in the raw material layer.

[0010] The beneficial effects of the present invention are as follows: by rapidly cooling the granulation quasi-particle group entering the sampling tube of the raw material layer of the sintering trolley, rapid sampling of the granulation quasi-particles of the raw material layer of the sintering machine is achieved under the action of the thrust or pull force applied at the upper end of the top cover. The present invention can avoid the problems faced by the traditional sampling method of the sintering raw material layer, such as the complicated process, high sampling cost, and great impact on the normal production of sintering. The sampling can be completed at low cost and high efficiency. According to the detection and analysis after sampling, the development and progress of sintering production increase, quality improvement and consumption reduction can be significantly promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of a quasi-granular rapid sampling device for raw material layer granulation of a sintering trolley according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the cold air guide pipe according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a sampling tube and a thermal resistance temperature measurement system according to an embodiment of the present invention; Figure 4 A schematic top view of a sampling tube and a thermal resistance temperature measurement system according to an embodiment of the present invention; In the figure: sampling tube 1, granulated quasi-particle group to be sampled 2, sampling tube top cover 3, top cover 4, cold air guide tube 5, vortex tube refrigeration air system 6, thermal resistance temperature measurement system 7, air permeable seam 8. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0013] A sintering trolley raw material layer granulation quasi-particle rapid sampling device comprises a sampling tube 1, a granulation quasi-particle group 2 to be sampled, a sampling tube top cover 3, a top cover 4, a cold air guide pipe 5, a vortex tube refrigeration air system 6 and a thermal resistor temperature measurement system 7, the granulation quasi-particle group 2 to be sampled is located in the sampling tube 1, the sampling tube 1 is provided with a sampling tube top cover 3 on the top, the sampling tube top cover 3 is provided with a top cover 4, a cold air guide pipe 5 is provided on the central axis of the sampling tube 1, and the cold air guide pipe 5 passes upward through the circular hole on the central axis of the sampling tube top cover 3 and is connected to the sampling tube top cover 3 The space between the top cover 4 and the vortex tube refrigeration air system 6 is connected to the circular hole opened on the circumference of the top cover through a metal hose and is thus connected to the space between the top cover plate 3 of the sampling tube and the top cover 4; the sampling tube 1 is provided with a thermal resistor temperature measurement system 7; the -10°C to -40°C cold air provided by the vortex tube refrigeration air system 6 passes through the cold air guide pipe 5 to quickly freeze the granulation quasi-particle group 2 entering the sampling tube 1 from the sintering raw material layer, and a pulling force is applied at the upper end of the top cover 4 to quickly remove the sampling tube and the quasi-particle group inside it from the sintering trolley, thereby completing the rapid sampling operation.

[0014] The cold air guide pipe 5 is a ventilation pipe with a cone barrel shape at the end, and a plurality of air permeable slits 8 are evenly opened along the circumference on the wall of the cold air guide pipe 5 .

[0015] The upper end of the sampling tube 1 has an internal thread, the inner diameter of the internal thread section is the same as the inner diameter of the sampling tube 1, and the tube wall at the lower end of the sampling tube is ground into a cone shape to facilitate the sampling tube to be quickly pressed into or out of the material layer.

[0016] The top cover 4 has an overall cylindrical shape and an internal thread structure. A circular hole is opened on one side of the bottom of the cylinder of the top cover 4. The vortex tube cooling air system 6 is connected to the circular hole through a metal hose and supplies cold air to the cold air guide pipe 5 through the space between the top cover plate 3 of the sampling tube and the top cover 4. A cylindrical platform is welded to the outside of the cylinder in the center of the top cover 4, and the external thrust or pull can be applied to the sampling tube 1 through the cylindrical platform.

[0017] The sampling tube top cover plate 3 is connected to and covers the top of the sampling tube 1. The sampling tube top cover plate is in the shape of a circular boss. The outer diameter of the lower part of the circular boss is equivalent to the inner diameter of the sampling tube 1, and is engaged with the inner thread of the sampling tube 1 through an external thread structure; the external thread structure of the circular boss upper part of the sampling tube top cover plate 3 is engaged with the inner thread structure of the top cover 4; there is a circular through hole on the central axis of the sampling tube top cover plate 3, and the cold air guide tube 5 can pass through the circular through hole and be engaged with the sampling tube top cover plate.

[0018] The thermal resistance temperature measurement system 7 adopts a nickel thermal resistance thermometer or a copper thermal resistance thermometer.

[0019] A method for quickly sampling granulated quasi-particles in a raw material layer of a sintering trolley, which quickly cools the granulated quasi-particle group entering the sampling tube 1 of the raw material layer of the sintering trolley, and realizes the rapid sampling of the granulated quasi-particles in the raw material layer of the sintering machine under the action of the thrust or pulling force applied at the upper end of the top cover 4; the method comprises the following steps: applying pressure through the top cover 4 to quickly press the sampling tube 1 into the raw material layer, and when the sampling tube is pressed into the material layer to a depth of 0.8 to 0.9 times the height of the sintering trolley, the granulated quasi-particles entering the sampling tube 1 in the sintering raw material layer are quickly frozen by means of -10°C to -40°C cold air provided by a vortex tube refrigeration air system 6 and a cold air guide pipe 5, and at the same time, a thermal resistance temperature measurement system 7 is used to detect the freezing effect of the granulated quasi-particle group in the sampling tube 1 in real time, and when the sampling tube 1 When the detected temperature in the bottom area is between -2°C and -5°C, a pulling force is applied through the top cover 4 to quickly remove the sampling tube 1 and the quasi-particle group inside it from the material layer, thereby completing the rapid sampling operation of the quasi-particles in the raw material layer.

[0020] This embodiment is for a sintering machine production line with a trolley height of 800mm. The compressed air of the vortex tube cooling air system 6 enters the vortex tube at a pressure of 0.65Mpa, an air intake flow rate of 500L / min, a cold air temperature of -26°C at the cold end of the vortex tube, and a cold air flow rate of 300L / min.

[0021] A method for rapid sampling of quasi-particles of granulation in the raw material layer of a sintering trolley comprises the following steps: rapid sampling operation of quasi-particles of the raw material layer. First, pressure is applied through the top cover 4 to quickly press the sampling tube 1 into the raw material layer. When the depth of the sampling tube 1 pressed into the material layer reaches 0.85 times the height of the sintering trolley (i.e., the pressing depth is 680 mm), the granulation quasi-particles entering the sampling tube 1 in the sintering raw material layer are quickly frozen by means of the -26°C cold air provided by the vortex tube refrigeration air system 6 and the cold air guide tube 5, and the freezing effect of the granulation quasi-particle group in the sampling tube 1 is synchronously and in real time detected by the thermal resistor temperature measurement system 7; secondly, when the temperature detected at the bottom end area of ​​the sampling tube 1 is -3°C, a pulling force is applied through the top cover 4 to quickly remove the sampling tube 1 from the material layer, thereby completing the rapid sampling operation of the quasi-particles of the raw material layer.

Claims

1. A sintering trolley raw material layer granulation quasi-particle rapid sampling device, characterized in that: The invention comprises a sampling tube (1), a granulated quasi-particle group to be sampled (2), a sampling tube top cover (3), a top cover (4), a cold air guide tube (5), a vortex tube cooling air system (6) and a thermal resistance temperature measurement system (7); wherein the granulated quasi-particle group to be sampled (2) is located in the sampling tube (1), a sampling tube top cover (3) is provided on the top of the sampling tube (1), a top cover (4) is provided on the top cover (3) of the sampling tube, a cold air guide tube (5) is provided on the central axis of the sampling tube (1), and the cold air guide tube (5) passes upward through a circular hole on the central axis of the sampling tube top cover (3) and is connected to the sampling tube top cover (3). The vortex tube refrigeration air system (6) is connected to the circular hole opened on the circumference of the top cover through a metal hose and is thus connected to the space between the top cover plate (3) of the sampling tube and the top cover (4); the sampling tube (1) is provided with a thermal resistor temperature measurement system (7); the -10°C to -40°C cold air provided by the vortex tube refrigeration air system (6) passes through the cold air guide pipe (5) to quickly freeze the granulation quasi-particle group (2) entering the sampling tube (1) from the sintering raw material layer, and a pulling force is applied to the upper end of the top cover (4) to quickly remove the sampling tube and the quasi-particle group inside it from the sintering trolley, thereby completing the rapid sampling.

2. The sintering trolley raw material layer granulation quasi-particle rapid sampling device according to claim 1 is characterized by: The cold air guide pipe (5) is a ventilation pipe with a conical barrel-shaped end, and a plurality of air permeable slits (8) are evenly opened along the circumference on the wall of the cold air guide pipe (5).

3. The sintering trolley raw material layer granulation quasi-particle rapid sampling device according to claim 1 or 2, characterized in that: The top cover (4) has an overall cylindrical shape, and the top cover (4) has an internal thread structure. A circular hole is opened on one side of the bottom of the cylinder of the top cover (4). The vortex tube cooling air system (6) is connected to the circular hole through a metal hose and supplies cold air to the cold air guide pipe (5) through the space between the top cover plate (3) of the sampling tube and the top cover (4). A cylindrical platform is welded to the outside of the cylinder in the center of the top cover (4), and the force applied from the outside can effectively act on the sampling tube (1) through the cylindrical platform.

4. The sintering trolley raw material layer granulation quasi-particle rapid sampling device according to claim 3 is characterized in that: The sampling tube top cover plate (3) is connected to and covers the top of the sampling tube (1); the sampling tube top cover plate is in the shape of a circular boss; the outer diameter of the lower portion of the circular boss is equivalent to the inner diameter of the sampling tube (1), and is engaged with the inner thread structure of the sampling tube (1) via an outer thread structure; the outer thread structure of the upper portion of the circular boss of the sampling tube top cover plate (3) is engaged with the inner thread structure of the top cover (4); a circular through hole is provided on the central axis of the sampling tube top cover plate (3), and the cold air guide tube (5) can pass through the circular through hole and be engaged with the sampling tube top cover plate.

5. A quasi-particle rapid sampling method for raw material layer granulation of a sintering trolley, using the quasi-particle rapid sampling device for raw material layer granulation of a sintering trolley according to any one of claims 1 to 4, characterized in that: By rapidly cooling the granulated quasi-particles group entering the sampling tube (1) from the raw material layer of the sintering trolley, rapid sampling of the granulated quasi-particles from the raw material layer of the sintering machine is achieved under the action of force applied at the upper end of the top cover (4); the process comprises the following steps: First, pressure is applied through the top cover (4) to quickly press the sampling tube (1) into the raw material layer. After the sampling tube (1) is vertically inserted into the material layer to a depth that reaches 0.8 to 0.9 times the height of the sintering trolley, the granulated quasi-particles entering the sampling tube (1) in the sintered raw material layer are quickly frozen by means of -10°C to -40°C cold air provided by the vortex tube refrigeration air system (6) and the cold air guide pipe (5). At the same time, a thermal resistance temperature measurement system (7) is used to detect in real time the freezing effect of the granulated quasi-particle group in the local area at the bottom of the sampling tube (1). Subsequently, when the detected temperature of the bottommost area of ​​the sampling tube (1) is between -2°C and -5°C, a pulling force is applied through the top cover (4) to quickly remove the sampling tube (1) and the quasi-particle group therein from the material layer, thereby completing the rapid sampling operation of the quasi-particles in the raw material layer.

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