A loosening device and method capable of increasing the temperature of sintering mixture

Abstract

The present invention belongs to the technical field of sintering of iron and steel metallurgy, and is a loosening device and method capable of increasing the temperature of sintering mixture, which comprises a mounting frame, a mounting plate, a steam main pipe, a steam branch pipe, a fixed loosening pipe and an oblique loosening pipe, a mounting plate is vertically fixedly mounted at the bottom of the mounting frame, vertically hanging steam branch pipes are evenly spaced on the mounting plate, a steam main pipe is connected at the upper end of each steam branch pipe, a fixed loosening pipe is connected and arranged on the pipe body of each steam branch pipe, each adjacent fixed loosening pipe is arranged at different heights and extends horizontally on the steam branch pipe, an oblique loosening pipe is obliquely pulled between each fixed loosening pipe and the steam branch pipe, and the steam branch pipe, the fixed loosening pipe and the oblique loosening pipe are connected and arranged. The structural design of the present invention is scientific and reasonable, and has the advantages of increasing the temperature of the mixture, improving the sintering quality, extending the service life, and being easy to implement.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy sintering, and relates to a loosening device, in particular to a loosening device and method capable of increasing the temperature of a sintering mixture. Background Art

[0002] At present, in order to improve the sintering permeability of thick iron ore powder layers, the sintering industry generally installs looseners at the head feeding position of the sintering machine. The existing looseners are plate structures, that is, strip steel plates with a length of 1000mm-2000mm, a width of 100-300mm, and a thickness of 8-10mm are arranged side by side in the width direction of the trolley at a spacing of 500mm. The looseners penetrate 200-500mm into the sintering mixture to loosen the material layer and improve the permeability of the sintering material layer.

[0003] However, the prior art still has the following defects and shortcomings:

[0004] 1. The plate-type loosening device cannot supply heat to the material layer and cannot increase the temperature of the mixed material, so as to reduce the influence of the over-wet layer in the material layer on the sintering process;

[0005] 2. Plate-type loosening device: the upper surface of the strip steel plate frequently sticks to the material, causing collapsed holes in the sintering material layer. The collapsed holes are prone to air leakage, which makes the air volume distribution of the sintering material layer uneven, resulting in the decline of sintered ore quality and the reduction of qualified rate;

[0006] 3. The plate-type structure loosener has a heavy weight, which creates a large load on the bracket that fixes the loosener. After a period of use, the bracket is prone to deformation, causing the loosener installed on it to sag. After sagging, it is easy to scratch against the sintering machine trolley, causing double scratching problems between the loosener and the grate bars. Summary of the invention

[0007] The purpose of the present invention is to provide a loosening device and method which has a scientific and reasonable structural design, can increase the temperature of the mixed material, improve the sintering quality, extend the service life, and is easy to implement and can increase the temperature of the sintering mixed material.

[0008] The present invention solves the technical problem by the following technical solutions:

[0009] A loosening device capable of increasing the temperature of a sintering mixture, characterized in that it comprises a mounting frame, a mounting plate, a steam main pipe, a steam branch pipe, a fixed loosening pipe and an oblique loosening pipe, the mounting frame being composed of a crossbeam and vertical beams mounted at both ends of the crossbeam, a mounting plate being vertically fixedly mounted on the bottom of the crossbeam, through holes being evenly spaced and arranged transversely on the mounting plate, a vertically hanging steam branch pipe being hung on each through hole, a steam main pipe being connected at the pipe opening at the upper end of each steam branch pipe, a steam inlet being formed at the end of the steam main pipe, a steam source being connected at the steam inlet, a fixed loosening pipe being connected and arranged on the pipe body of each steam branch pipe, adjacent fixed loosening pipes being arranged at different heights and extending horizontally on the steam branch pipe, an oblique loosening pipe being obliquely stretched between each fixed loosening pipe and the steam branch pipe, steam outlet holes being spaced at a distance at the front position at the bottom of the pipe body of the fixed loosening pipe and the oblique loosening pipe, and the steam branch pipe, the fixed loosening pipe and the oblique loosening pipe being connected and arranged.

[0010] Moreover, it also includes valves, and valves are arranged on each of the steam branch pipes.

[0011] Moreover, it also includes an auxiliary loosening mechanism, which includes a cylinder and a telescopic loosening pipe. Mounting holes arranged longitudinally between two steam branch pipes are provided on the mounting plate. Cylinders are installed at the corresponding mounting holes on the back side of the mounting plate through a hanging bracket. The cylinder rod of each cylinder extends out from the mounting hole and is driven and connected to the horizontally arranged telescopic loosening pipe.

[0012] Moreover, it also includes angle steel, which is arranged at the top front end of the fixed loose material pipe and the inclined loose material pipe.

[0013] Moreover, it also comprises a vibrator, and the vibrator is installed on the back side of the installation plate.

[0014] A loosening method capable of increasing the temperature of a sintering mixture, characterized in that it comprises the following methods:

[0015] Step 1, according to the properties of the mixture and the process requirements, a corresponding number of telescopic loosening pipes are extended by the cylinder;

[0016] Step 2, turn on the gas source switch, the steam enters the steam branch pipe through the steam main pipe, and then enters the fixed loose material pipe and the inclined loose material pipe through the steam branch pipe, and finally outputs from the steam outlet holes of the fixed loose material pipe and the inclined loose material pipe;

[0017] Step 3, the mixture is transported to the sintering trolley through the nine-roller distributor. During the falling process, due to the buffering effect of the fixed loosening pipe and the oblique loosening pipe on the material flow, the mixture is not directly sprinkled on the trolley grate, and the particle size of the mixture is segregated when bypassing the fixed loosening pipe and the oblique loosening pipe, so that the particle size of the mixture directly below the fixed loosening pipe and the oblique loosening pipe is larger. At the same time, as the trolley moves forward, the material layer also moves forward, and the fixed loosening pipe and the oblique loosening pipe are slowly extracted from the mixture. The space occupied by the fixed loosening pipe and the oblique loosening pipe leaves a cross section as the trolley moves, and the cross section forms a breathable surface. The scraped mixture is sprinkled on the trolley grate, and the telescopic loosening pipe is extracted to leave horizontal holes, and the horizontal holes form a breathable belt;

[0018] Step 4: Under the action of high-pressure steam, the temperature of the mixed material is further increased before ignition, and the heat released by the steam is fully transferred to the sintering material, reducing heat loss and improving the utilization efficiency of steam heat.

[0019] Moreover, the extended telescopic material loosening tubes are arranged in a staggered manner.

[0020] The advantages and beneficial effects of the present invention are:

[0021] 1. The loosening device and method for increasing the temperature of the sintering mixture can increase the temperature of the mixture by inputting steam while loosening the material, thereby reducing the influence of the over-wet layer in the material layer on the sintering process; the problem of sticking materials is reduced by designing the loosening device with a plate structure as a tubular structure; the problem of scratching the trolley due to the drooping of the feeder is avoided by the design of the inclined loosening pipe, thereby extending the service life of the equipment.

[0022] 2. The loosening device and method for increasing the temperature of the sintering mixture can select an appropriate number of telescopic loosening tubes to act on the mixture according to the process requirements through the setting of the auxiliary loosening mechanism to meet the air permeability requirements.

[0023] 3. The material loosening device and method capable of increasing the temperature of the sintering mixture, through the setting of angle steel, enables the tops of the fixed material loosening pipe and the inclined material loosening pipe to form a pointed top structure, thereby solving the problem of material storage on the upper end surface.

[0024] 4. The structural design of the present invention is scientific and reasonable, and has the advantages of increasing the temperature of the mixture, improving the sintering quality, extending the service life, and being easy to implement. It is a highly innovative loosening device and method that can increase the temperature of the sintering mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2It is a side view of the present invention.

[0027] Reference numerals

[0028] 1-sintering machine trolley, 2-cylinder, 3-mounting frame, 4-mounting plate, 5-steam branch pipe, 6-inclined loosening pipe, 7-fixed loosening pipe, 8-nine-roller distributor, 9-mixed material, 10-vertical beam, 11-cross beam, 12-trolley grate, 13-telescopic loosening pipe, 14-angle steel. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0030] A loosening device capable of increasing the temperature of the sintering mixture, the tubular steam loosening device is installed at a position 2.5 meters in front of the nine-roller distributor 8, and its innovation lies in: comprising a mounting frame 3, a mounting plate 4, a steam main pipe, a steam branch pipe 5, a fixed loosening pipe 7 and an inclined loosening pipe 6, the mounting frame is composed of a crossbeam 11 and vertical beams 10 installed at both ends of the crossbeam, a mounting plate is vertically fixed at the bottom of the crossbeam, and transversely arranged perforations are evenly spaced on the mounting plate, and vertically hanging steam branch pipes are hung on each perforation, the steam branch pipes are 2000mm long, and a steam is connected to the upper end of each steam branch pipe. Main pipe, the steam main pipe is a steel pipe with a length of 3000mm and a diameter of 25mm. A steam inlet is formed at the end of the steam main pipe, and a steam source is connected to the steam inlet. A fixed loosening pipe is connected to the pipe body of each steam branch pipe. Adjacent fixed loosening pipes are arranged at different heights and extend horizontally on the steam branch pipe. An oblique loosening pipe is obliquely pulled between each fixed loosening pipe and the steam branch pipe. Steam outlet holes are arranged at intervals at the front position of the bottom of the pipe body of the fixed loosening pipe and the oblique loosening pipe. The steam branch pipe, the fixed loosening pipe and the oblique loosening pipe are connected.

[0031] In this embodiment, there are two layers of fixed loose material pipes arranged at different heights, each layer is 300 mm and 500 mm away from the plane of the grate bars 12 of the trolley respectively, and extends parallel to the running direction of the sintering machine trolley 1 to about 400-600 mm into the mixed material 9.

[0032] In order to facilitate the control of the amount of steam introduced, the present invention is further provided with a valve, and a valve is provided on each of the steam branch pipes.

[0033] It also includes an auxiliary loosening mechanism, which includes a cylinder 2 and a telescopic loosening pipe 13. Mounting holes arranged longitudinally between the steam branch pipes are provided on the mounting plate. Cylinders are installed at the corresponding mounting holes on the back side of the mounting plate through a hanging bracket. The cylinder rod of each cylinder extends out from the mounting hole and is driven and connected to the horizontally arranged telescopic loosening pipe.

[0034] In this embodiment, there are 4 fixed loose material pipes at intervals on the upper layer, 4 fixed loose material pipes at intervals on the lower layer, and 8 inclined loose material pipes, which meet the basic air permeability requirements. When the mixture conditions or operating parameters change, the air permeability of the mixture needs to be adjusted, that is, when the original particle size of the mixture increases or the spheroidization is enhanced, the air permeability of the material layer itself will increase. At this time, the use of fixed loose material pipes and inclined loose material pipes can meet the air permeability requirements; when the air permeability of the mixture itself deviates, the air permeability of the material layer is enhanced by increasing the number of telescopic loose material pipes inserted. If the air permeability meets the process requirements, it will increase the sintering speed, shorten the sintering time, and significantly improve the quality and output of the sintered ore.

[0035] In order to solve the problem of material accumulation on the upper end surface of the fixed loose material pipe and the oblique loose material pipe, the present invention designs an angle steel 14, and an angle steel is arranged at the top front end of the fixed loose material pipe and the oblique loose material pipe.

[0036] In order to further solve the problem of material accumulation on the upper end surface of the fixed loose material pipe, the inclined loose material pipe and the telescopic loose material pipe, the utility model is also designed with a vibrator, and the vibrator is installed on the back of the mounting plate. After the loose material pipe works for a period of time, the vibrator is turned on to vibrate the fixed loose material pipe, the inclined loose material pipe and the telescopic loose material pipe to make the material accumulated on the loose material pipe fall off.

[0037] The steam source is dry steam, and the wet steam is separated into gas and liquid by a gas-liquid separator. The separated dry steam is connected to the steam inlet on the steam main pipe through a pipeline, and is output from the steam outlet holes on the fixed loosening pipe and the inclined loosening pipe to steam preheat the sintering mixture and increase the temperature of the mixture. In this way, the mixture is directly fed into the sintering machine for the sintering process after being preheated, thereby reducing the heat demand for preheating the mixture.

[0038] A loosening method capable of increasing the temperature of a sintering mixture, the innovation of which is that it includes the following methods:

[0039] Step 1, according to the properties of the mixture and the process requirements, a corresponding number of telescopic loosening pipes are extended by the cylinder;

[0040] Step 2, turn on the gas source switch, the steam enters the steam branch pipe through the steam main pipe, and then enters the fixed loose material pipe and the inclined loose material pipe through the steam branch pipe, and finally outputs from the steam outlet holes of the fixed loose material pipe and the inclined loose material pipe;

[0041] Step 3, the mixture is transported to the sintering trolley through the nine-roller distributor. During the falling process, due to the buffering effect of the fixed loosening pipe and the oblique loosening pipe on the material flow, the mixture is not directly sprinkled on the trolley grate, and the particle size of the mixture is segregated when bypassing the fixed loosening pipe and the oblique loosening pipe, so that the particle size of the mixture directly below the fixed loosening pipe and the oblique loosening pipe is larger. At the same time, as the trolley moves forward, the material layer also moves forward, and the fixed loosening pipe and the oblique loosening pipe are slowly extracted from the mixture. The space occupied by the fixed loosening pipe and the oblique loosening pipe leaves a cross section as the trolley moves, and the cross section forms a breathable surface. The scraped mixture is sprinkled on the trolley grate, and the telescopic loosening pipe is extracted to leave horizontal holes, and the horizontal holes form a breathable belt;

[0042] Step 4: Under the action of high-pressure steam, the temperature of the mixed material is further increased before ignition, and the heat released by the steam is fully transferred to the sintering material, reducing heat loss and improving the utilization efficiency of steam heat.

[0043] In order to ensure the uniformity of the air permeability of the mixture, the extended telescopic loosening pipes are arranged in a staggered manner.

[0044] The increase in the temperature of the mixture can weaken or even eliminate the over-wet layer in the sintering material layer. The thinning or disappearance of the over-wet layer is conducive to improving the air permeability of the sintering material and reducing the resistance of the combustion air passing through the sintering material layer. As a result, the negative pressure of the main pipe has been significantly reduced compared with that before the transformation. As the combustion layer moves from top to bottom, the moisture in the mixture is gradually enriched by the hot exhaust gas. The temperature of the steam-preheated mixture is higher than the dew point temperature, and the water vapor cannot condense into liquid water. The reduction in exhaust resistance directly increases the vertical sintering speed. At the same time, the solid fuel consumption is also improved. The main technical and economic indicators of the sintered ore, such as the yield, strength, utilization coefficient, and screening index, have been improved to varying degrees.

[0045] According to the calculation of sintering process, the fuel consumption can be reduced by 0.296Kg / t for every 1℃ increase in the temperature of the sintering mixture. According to the production data, the temperature of the mixture rises to 70℃ after the steam is injected into the loosening device, which is 10℃ higher than the temperature of the mixture in the small ore trough. By preheating the mixture in the loosening device pipeline to increase the material temperature, good results have been achieved. The output and quality of sintered ore have been greatly improved, and the comprehensive process energy consumption has been reduced, which has met the needs of blast furnace production to a certain extent.

[0046] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A loosening device capable of increasing the temperature of a sintering mixture, characterized in that: The utility model comprises a mounting frame, a mounting plate, a steam main pipe, a steam branch pipe, a fixed loose material pipe and an oblique loose material pipe. The mounting frame is composed of a cross beam and a vertical beam installed at both ends of the cross beam. A mounting plate is vertically fixedly installed at the bottom of the cross beam. The mounting plate is evenly and evenly spaced with transversely arranged perforations. A vertically hanging steam branch pipe is hung on each perforation. A steam main pipe is connected to the upper end of each steam branch pipe. A steam inlet is formed at the end of the steam main pipe. A steam source is connected to the steam inlet. A fixed loose material pipe is connected on the pipe body of each steam branch pipe. Each adjacent fixed loose material pipe is staggered in height and extends horizontally from the steam branch pipe. An oblique loose material pipe is obliquely stretched between each fixed loose material pipe and the steam branch pipe. Steam outlet holes are spaced at intervals at the front position of the bottom of the pipe body of the fixed loose material pipe and the oblique loose material pipe. The steam branch pipe, the fixed loose material pipe and the oblique loose material pipe are connected.

2. A loosening device capable of increasing the temperature of sintering mixed materials according to claim 1, characterized in that: It also includes valves, and each of the steam branch pipes is provided with a valve.

3. A loosening device capable of increasing the temperature of sintering mixed materials according to claim 1, characterized in that: It also includes an auxiliary loosening mechanism, which includes a cylinder and a telescopic loosening pipe. Mounting holes arranged longitudinally between the steam branch pipes are provided on the mounting plate. Cylinders are installed at the corresponding mounting holes on the back side of the mounting plate through a hanging bracket. The cylinder rod of each cylinder extends out from the mounting hole and is driven and connected to the horizontally arranged telescopic loosening pipe.

4. A loosening device capable of increasing the temperature of sintering mixed materials according to claim 1, characterized in that: It also includes angle steel, which is arranged at the top front end of the fixed loose material pipe and the inclined loose material pipe.

5. The loosening device capable of increasing the temperature of the sintering mixture according to claim 1, characterized in that: It also includes a vibrator, which is installed on the back of the installation plate.

6. A loosening method capable of increasing the temperature of a sintering mixture, characterized in that: The method is implemented based on the loosening device described in any one of claims 1 to 5, and includes the following method: Step 1, according to the properties of the mixture and the process requirements, a corresponding number of telescopic loosening pipes are extended by the cylinder; Step 2, turn on the gas source switch, the steam enters the steam branch pipe through the steam main pipe, and then enters the fixed loose material pipe and the inclined loose material pipe through the steam branch pipe, and finally outputs from the steam outlet holes of the fixed loose material pipe and the inclined loose material pipe; Step 3, the mixture is transported to the sintering trolley through the nine-roller distributor. During the falling process, due to the buffering effect of the fixed loosening pipe and the oblique loosening pipe on the material flow, the mixture is not directly sprinkled on the trolley grate, and the particle size of the mixture is segregated when bypassing the fixed loosening pipe and the oblique loosening pipe, so that the particle size of the mixture directly below the fixed loosening pipe and the oblique loosening pipe is larger. At the same time, as the trolley moves forward, the material layer also moves forward, and the fixed loosening pipe and the oblique loosening pipe are slowly extracted from the mixture. The space occupied by the fixed loosening pipe and the oblique loosening pipe leaves a cross section as the trolley moves, and the cross section forms a breathable surface. The scraped mixture is sprinkled on the trolley grate, and the telescopic loosening pipe is extracted to leave horizontal holes, and the horizontal holes form a breathable belt; Step 4: Under the action of high-pressure steam, the temperature of the mixed material is further increased before ignition, and the heat released by the steam is fully transferred to the sintering material, reducing heat loss and improving the utilization efficiency of steam heat.

7. A loosening method for increasing the temperature of a sintering mixture according to claim 6, characterized in that: The extended telescopic material loosening pipes are arranged in a staggered manner.

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