A device and method for taking a mixed sample of a sintering machine pallet without stopping

Abstract

The present application relates to a kind of device of sintering machine trolley without stopping taking mixed sample, the device includes nine roller distributor, off roller distributor, work platform, refractory material, ignition furnace, mixed material, trolley, round handle, connecting rod, sampling cylinder, material blocking disc, disc rod and handle rod, wherein nine roller distributor is arranged below off roller distributor, work platform is between ignition furnace and off roller distributor, ignition furnace is above trolley, round handle is welded with connecting rod, connecting rod and sampling cylinder are welded, material blocking disc and handle rod are welded through disc rod, and mixed material is conveniently and conveniently layered;The sampling device of the scheme has low manufacturing cost and simple structure;Sampling is carried out without stopping in the case of sintering machine trolley, avoids a large amount of raw ore production caused by sampling, loss of sintered ore production, and the problem of off-machine dust unorganized emission exceeding standard.

Description

Technical Field

[0001] This invention relates to a device and method for taking samples of sintered mixtures without stopping the sintering machine trolley, thereby detecting the chemical composition of the sintered mixture from top to bottom on the trolley, belonging to the field of sintering technology in the iron and steel metallurgy industry. Background Technology

[0002] In ironmaking technology, the sinter used in blast furnaces is produced through a sintering process. Various ores are mixed evenly with fuel and flux, and then fed onto the sintering machine trolley via a roller distributor and a nine-roll distributor. The thickness of the mixture is generally 500-1000 mm. The mixture is ignited by an igniter, and air is drawn from below the trolley to sinter it into ore particles, which are called sinter.

[0003] Due to differences in particle size and bulk density of the ore, fuel, and flux, segregation occurs in the mixture on the sintering trolley during the feeding process, affecting particle size, fixed carbon content, and basicity, among other factors. A desirable segregation behavior is characterized by a gradual decrease in fixed carbon from top to bottom, thus maximizing the automatic heat storage function of the sintering machine and reducing fuel consumption. The most direct way to evaluate the effectiveness of the sintering feeding segregation is to stop ignition during production, wait for the raw material to exit the furnace, then hoist a section of the trolley and take samples from top to bottom for chemical composition analysis. This sampling method has the following problems: 1) The ignition furnace covers an area of ​​about 7 to 8 trolley cars. In addition, with the start and stop times at the beginning and end, about 13 trolley cars are used for sampling each time. These raw materials go directly into the small ore bin and become internal return ore, causing significant economic losses; 2) The raw materials entering the small ore bin will generate a lot of dust, exceeding the capacity of the tail dust collector, which can easily cause excessive fugitive emissions; 3) During the trolley hoisting process, the raw materials on both sides are prone to collapse and fall into the sintering air box or the main flue, making cleaning difficult.

[0004] A search of patent literature on sintering trolley sampling revealed three main patents. Patent application CN95213564.7 discloses a sintering trolley mixture sampling device, primarily used for sampling before ignition. However, this device has limitations in sampling methods, and the high temperature and confined space between the igniter and the material distribution roller pose safety risks for manual operation. Patent application CN201120049191.2 discloses a self-closing sampling device for sintering mixtures, but it does not describe the sampling method. The structure of our device differs from this one. Furthermore, it involves specific sampling methods. Patent application number CN201710585865.2 discloses a sintering trolley layered sampling device and method. This method involves placing a layered sampling device before the material is fed, without igniting it when it passes the igniter, and then hoisting the sampling device for testing. However, this method has problems. The sintering machine has a material release device before the material is fed, and above the release device is the nine-roller material feeder. There is no space to place the sampling device. Moreover, the mixed material rolls down the material surface during feeding, and the baffle on one side of the device can obstruct the rolling of particles, affecting the test results. The sampling device in this invention differs from the device in the aforementioned patent. The sampling position is after the igniter and does not require shutting off the igniter, thus having less impact on production. Therefore, a new solution is urgently needed to address the aforementioned technical problems. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by providing a device for taking samples of the mixture on a sintering machine trolley without stopping the machine. The purpose of this technical solution is to quickly and safely take samples of the mixture on the sintering trolley for testing of chemical composition, particle size, etc. By laying heat-insulating refractory material on the material surface before the ignition furnace, and without stopping the ignition, after the raw material passes through the ignition furnace, the sampling device is used to take samples of the mixture under the refractory material according to certain steps.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a device for taking samples of a mixture without stopping the sintering machine trolley, characterized in that the device includes a nine-roller distributor, a roller distributor, a working platform, refractory material, an ignition furnace, a mixture, a trolley, a circular handle, a connecting rod, a sampling cylinder, a baffle disc, a disc rod, and a handle rod, wherein the nine-roller distributor is located below the roller distributor, the working platform is located between the ignition furnace and the roller distributor, the ignition furnace is located above the trolley, the circular handle is welded to the connecting rod, the connecting rod is welded to the sampling cylinder, and the baffle disc and the handle rod are welded together via the disc rod, which facilitates the stratification of the mixture.

[0007] As an improvement of the present invention, the sampling cylinder is provided with three insertion ports, which are, from top to bottom, the upper insertion port, the middle insertion port and the lower insertion port, respectively, and the retaining disc is inserted into them after sampling.

[0008] As an improvement of the present invention, the refractory material is asbestos, made of fibrous silicate, which can be folded, has a size of 1m*1m, a thickness of 3 to 8cm, can withstand temperatures greater than 1500℃, and has a heat insulation function to ensure that the mixture below the refractory material is not ignited when it passes through the ignition furnace.

[0009] As an improvement of the present invention, the circular handle, connecting rod, sampling cylinder, stop disc, disc rod, and handle rod are all made of 304 stainless steel. The sampling cylinder is a hollow cylinder with a height of 100cm, a diameter of 10cm, and a thickness of 2mm. The circular handle has a diameter of 8cm.

[0010] As an improvement of the present invention, the opening depth of the upper, middle and lower inlets is 5cm and the height is 2mm. The lower inlet is 2cm away from the bottom of the sampling cylinder. The distance from the upper inlet to the middle inlet is equal to the distance from the lower inlet to the middle inlet, which is equal to 1 / 2 of the material layer thickness, ensuring that the obtained mixed sample can be divided into three equal parts: upper, middle and lower.

[0011] As an improvement of the present invention, the baffle disc is a solid thin sheet with a thickness of 1 mm and a diameter of 9 cm.

[0012] A method for taking samples of a mixture without stopping the sintering machine trolley, the method comprising the following steps:

[0013] (1) The trolley runs to the right at a certain speed. The mixture is fed from the roller distributor to the nine roller distributor and then enters the trolley. The mixture passes through the working platform and the ignition furnace in sequence. The ignition furnace ignites and sinters the mixture.

[0014] (2) During the process of the mixture moving to the right, a piece of refractory material is placed between the working platform and the ignition furnace;

[0015] (3) When the refractory material and the mixture pass through the ignition furnace, the refractory material is removed when the distance from the ignition furnace is greater than 5m. At this time, the mixture under the refractory material is not ignited.

[0016] (4) In the center of the unignited mixture, use the trolley mixture sampling device to perform sampling operations. Manually press the circular handle to push the sampling cylinder into the mixture, and press it in to a depth equal to the thickness of the mixture layer.

[0017] (5) Dig out a 10cm space in the mixture next to the upper, middle and lower inlets, insert the baffle discs into each, divide the mixture in the sampling cylinder into three parts, take out the sampling cylinder, and test the particle size and chemical composition of the three parts of the mixture respectively.

[0018] (6) Take a portion of the mixture to fill the space left by the sampling cylinder.

[0019] Compared with the prior art, the present invention has the following advantages: 1) The sintering machine trolley, nine-roller feeder, off-roller feeder, and ignition furnace described in the present invention are general equipment for sintering plants, and the working platform is an ordinary carbon steel working platform; the refractory asbestos material can be the asbestos material used for pipe insulation in steel plants, which can be reused; after the mixture comes out of the ignition furnace, there is still a distance of about 60m from the end, and the sampling point has about 30 minutes to run to the end, which is sufficient sampling time; only a small part of the mixture under the asbestos is taken from the center, and although the surrounding sintered ore is hot, the temperature of the mixture is not high when it is not ignited, so there will be no safety problem; 2) This method The solution allows for top-to-bottom stratified sampling of the mixture without stopping the sintering machine trolley. Based on the particle size and chemical composition of the stratified mixture, the segregation effect of the sintering material is assessed, avoiding the generation of large amounts of raw ore, resulting in lost sinter production and excessive fugitive dust emissions from the tail end of the machine. 3) The sampling device in this solution has low manufacturing cost and a simple structure; sampling is performed without stopping the sintering machine trolley, avoiding the generation of large amounts of raw ore, resulting in lost sinter production and excessive fugitive dust emissions from the tail end of the machine. 4) This solution prevents the mixture from spilling and clogging the main flue and air box during the hoisting process. Attached Figure Description

[0020] Figure 1 : Sampling diagram of the trolley;

[0021] Figure 2 Schematic diagram of the sampling device.

[0022] In the diagram: 1-Nine-roller material distributor; 2-Off-roller material distributor; 3-Working platform; 4-Refractory material; 5-Ignition furnace; 6-Mixed material; 7-Trolley; 8-Circular handle; 9-Connecting rod; 10-Sampling cylinder; 11-Upper insertion port; 12-Middle insertion port; 13-Lower insertion port; 14-Stopping disc; 15-Disc rod; 16-Handle rod. Detailed Implementation

[0023] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0024] Example 1: See Figure 1 , Figure 2 See also Figure 1 and Figure 2A sampling device for a sintering machine trolley includes a nine-roller feeder 1, a roller feeder 2, a working platform 3, refractory material 4, an ignition furnace 5, a mixture 6, and a trolley 7. The device further includes a circular handle 8, a connecting rod 9, a sampling cylinder 10, a baffle disc 14, a disc rod 15, and a handle rod 16. The circular handle 8 is welded to the connecting rod 9, and the connecting rod 9 is welded to the sampling cylinder 10. The baffle disc 14 and the handle rod 16 are welded together via the disc rod 15, facilitating convenient stratification of the mixture. The nine-roller feeder is positioned below the roller feeder, the working platform is located between the ignition furnace and the roller feeder, and the ignition furnace is above the trolley. The circular handle is welded to the connecting rod, the connecting rod is welded to the sampling cylinder, and the baffle disc and the handle rod are welded together via the disc rod, facilitating convenient stratification of the mixture.

[0025] The sampling cylinder is provided with three insertion ports, which are, from top to bottom, upper insertion port 11, middle insertion port 12, and lower insertion port 13, respectively. After sampling, the material blocking disc 14 is inserted into each of them.

[0026] Example 2: See Figure 1 , Figure 2 As an improvement of the present invention, the refractory material is asbestos, made of fibrous silicate, foldable, 1m*1m in size, 3-8cm thick, and can withstand temperatures greater than 1500℃. It has a heat insulation function, ensuring that the mixture below the refractory material is not ignited when passing through the ignition furnace. The remaining structure and advantages are exactly the same as in Example 1.

[0027] Example 3: See Figure 1 , Figure 2 As an improvement of the present invention, the circular handle, connecting rod, sampling cylinder, stop disc, disc rod, and handle rod are all made of 304 stainless steel. The sampling cylinder is a hollow cylinder with a height of 100cm, a diameter of 10cm, and a thickness of 2mm. The circular handle has a diameter of 8cm. The remaining structure and advantages are exactly the same as in Embodiment 1.

[0028] Example 4: See Figure 1 , Figure 2 As an improvement of the present invention, the upper, middle, and lower insertion ports are all 5cm deep and 2mm high. The lower insertion port is 2cm from the bottom of the sampling cylinder. The distance from the upper insertion port to the middle insertion port is equal to the distance from the lower insertion port to the middle insertion port, which is equal to 1 / 2 of the material layer thickness, ensuring that the obtained mixed sample can be divided into three equal parts (upper, middle, and lower). The remaining structure and advantages are exactly the same as in Example 1.

[0029] Example 5: See Figure 1 , Figure 2 A method for taking samples of a mixture without stopping the sintering machine trolley, the method comprising the following steps:

[0030] (1) The trolley 7 runs to the right at a certain speed. The mixture 6 passes through the roller distributor 2 and goes down to the nine roller distributor 1, and then enters the trolley 7. The mixture passes through the working platform 3 and the ignition furnace 5 in sequence. The ignition furnace 5 ignites and sinters the mixture.

[0031] (2) During the process of the mixture 6 moving to the right, a piece of refractory material 4 is placed between the working platform 3 and the ignition furnace 5;

[0032] (3) When the refractory material 4 and the mixture 6 pass through the ignition furnace 5 and the distance from the ignition furnace is greater than 5m, the refractory material is removed. At this time, the mixture under the refractory material is not ignited.

[0033] (4) In the center of the unignited mixture 6, the trolley mixture sampling device is used to perform sampling operations. The sampling cylinder 10 is pressed into the mixture by the manual force of the circular handle 8 and the depth of the pressing is equal to the thickness of the mixture layer.

[0034] (5) Dig out a 10cm space in the mixture next to the upper inlet 11, middle inlet 12 and lower inlet 13, insert the baffle disc 14 into each, divide the mixture in the sampling cylinder into three parts, take out the sampling cylinder, and test the particle size and chemical composition of the three parts of the mixture respectively.

[0035] (6) Take a portion of the mixture to fill the space left by the sampling cylinder 10.

[0036] Example 6: Taking a sintering plant's trolley sampling without shutting down the machine as an example. The trolley's running speed is 1.9 m / min, its total length is 90 m, and it is 65 m from the dust collector at the tail end of the ignition furnace. The ignition furnace temperature is 1050℃, and the refractory material is asbestos removed from the insulation layer of the blast furnace gas pipeline. Sampling begins when the asbestos has exited the ignition furnace at a distance greater than 5 m.

[0037] A method for sampling on a sintering machine trolley without shutting down the machine includes the following steps:

[0038] The trolley 7 moves to the right at a speed of 1.9 m / min. The mixture 6 passes through the off-roller distributor 2 and then onto the nine-roller distributor 1, before entering the trolley 7. The mixture passes through the working platform 3 and the ignition furnace 5 in sequence, and the ignition furnace 5 ignites and sinters the mixture.

[0039] As the mixture 6 moves to the right, a 1m×1m piece of refractory material 4 is placed between the working platform 3 and the ignition furnace 5.

[0040] When the refractory material 4 and the mixture 6 pass through the ignition furnace 5, and the distance from the ignition furnace 5 is greater than 5m, the refractory material 4 is removed. At this time, the mixture 6 under the refractory material 4 is not ignited.

[0041] At the center of the unignited mixture 6, a sampling operation is carried out using a trolley-mounted mixture sampling device. The sampling cylinder 10 is pressed into the mixture 6 by manual force using the circular handle 8, and the depth of insertion is equal to the thickness of the mixture layer.

[0042] A 10cm space is carved out of the mixture next to the upper inlet 11, middle inlet 12, and lower inlet 13. The material blocking discs 14 are inserted into each of these discs. The mixture inside the sampling cylinder 10 is divided into three portions. The sampling cylinder 10 is then removed, and the particle size and chemical composition of the three portions of the mixture are tested.

[0043] Take a portion of the mixture 6 to fill the space left by the sampling cylinder 10.

[0044] The mixture inside the sampling cylinder was poured out for sieving and sample preparation in one go. The test results are as follows:

[0045] Table 1. Sampling and testing results of each vehicle

[0046] Location Combustible carbon, % Average particle size, mm alkalinity upper part 3.08 3.24 1.86 Central 2.92 3.49 1.77 lower part 2.80 3.49 1.85

[0047] The results show that the combustible carbon gradually decreases from top to bottom, which is in line with the pattern, but the particle size segregation of the mixture is irregular and needs to be improved; the alkalinity distribution of the mixture is uneven, which also needs to be improved.

[0048] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A device for taking samples of a mixture without stopping the sintering machine trolley, characterized in that, The device includes a nine-roller distributor, a roller distributor, a working platform, refractory material, an ignition furnace, a mixture, a trolley, and a sampling device. The sampling device is located after the ignition furnace and includes a circular handle, a connecting rod, a sampling cylinder, a baffle disc, a disc rod, and a handle rod. The refractory material is placed between the working platform and the ignition furnace and passes through the ignition furnace with the trolley. The nine-roller distributor is located below the roller distributor, the working platform is between the ignition furnace and the roller distributor, and the ignition furnace is above the trolley. The circular handle is welded to the connecting rod, the connecting rod is welded to the sampling cylinder, and the baffle disc and the handle rod are welded together via the disc rod.

2. The device for taking samples of the mixture without stopping the sintering machine trolley according to claim 1, characterized in that, The sampling cylinder has three insertion ports, which are the upper insertion port, the middle insertion port and the lower insertion port from top to bottom. After sampling, the blocking disc is inserted into each of them.

3. The device for taking samples of the mixture without stopping the sintering machine trolley according to claim 2, characterized in that, The refractory material is asbestos, made of fibrous silicate, with a size of 1m*1m and a thickness of 3~8cm, and can withstand temperatures greater than 1500℃.

4. The apparatus for taking samples of the mixture without stopping the sintering machine trolley according to claim 3, characterized in that, The circular handle, connecting rod, sampling cylinder, stop disc, disc rod, and handle rod are all made of 304 stainless steel. The sampling cylinder is a hollow cylinder with a height of 100cm, a diameter of 10cm, and a thickness of 2mm. The circular handle has a diameter of 8cm.

5. The apparatus for taking samples of the mixture without stopping the sintering machine trolley according to claim 3 or 4, characterized in that, The upper, middle, and lower inlets all have an opening depth of 5cm and a height of 2mm. The lower inlet is 2cm from the bottom of the sampling cylinder. The distance from the upper inlet to the middle inlet is equal to the distance from the lower inlet to the middle inlet, which is equal to 1 / 2 of the material layer thickness, ensuring that the obtained mixed material sample can be divided into three equal parts: upper, middle, and lower.

6. The apparatus for taking samples of a mixture without stopping the sintering machine trolley according to claim 5, characterized in that, The baffle disc is a solid thin sheet with a thickness of 1 mm and a diameter of 9 cm.

7. A method for taking samples of a mixture without stopping the sintering machine trolley, characterized in that, The method, employing the apparatus according to any one of claims 1-6, comprises the following steps: (1) The trolley runs to the right at a certain speed. The mixture is fed from the roller distributor to the nine roller distributor and then into the trolley. The mixture passes through the working platform and the ignition furnace in sequence. The ignition furnace ignites and sinters the mixture. (2) During the process of the mixture moving to the right, a piece of refractory material is placed between the working platform and the ignition furnace; (3) When the refractory material and the mixture pass through the ignition furnace, the refractory material is removed when the distance from the ignition furnace is greater than 5m. At this time, the mixture under the refractory material is not ignited. (4) In the center of the unignited mixture, use the trolley mixture sampling device to perform sampling operations. Manually press the circular handle to push the sampling cylinder into the mixture, and press it in to a depth equal to the thickness of the mixture layer. (5) Dig out 10cm of space in the mixture next to the upper, middle and lower inlets, insert the baffle discs into them respectively, divide the mixture in the sampling cylinder into three parts, take out the sampling cylinder, and test the particle size and chemical composition of the three parts of the mixture respectively. (6) Take a portion of the mixture to fill the space left by the sampling cylinder.

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