CN115164597A - Segregation distributing device and method for sintering machine - Google Patents
Segregation distributing device and method for sintering machine Download PDFInfo
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- CN115164597A CN115164597A CN202210802308.2A CN202210802308A CN115164597A CN 115164597 A CN115164597 A CN 115164597A CN 202210802308 A CN202210802308 A CN 202210802308A CN 115164597 A CN115164597 A CN 115164597A
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- 238000005245 sintering Methods 0.000 title claims abstract description 84
- 238000005204 segregation Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 98
- 239000000446 fuel Substances 0.000 claims abstract description 96
- 238000009826 distribution Methods 0.000 claims abstract description 47
- 238000007664 blowing Methods 0.000 claims abstract description 37
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 50
- 239000003546 flue gas Substances 0.000 claims description 50
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 20
- 230000035699 permeability Effects 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 20
- 229910052799 carbon Inorganic materials 0.000 description 20
- 239000003245 coal Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000004449 solid propellant Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
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Abstract
The invention relates to a segregation distributing device and a segregation distributing method for a sintering machine, wherein the segregation distributing device for the sintering machine comprises a feeding device, a multi-roller distributor, a sintering trolley and a fuel steam injection unit, and a blowing pipe assembly of the fuel steam injection unit is arranged between the multi-roller distributor and the sintering trolley so as to form a uniform and stable fuel steam phase in the space. The invention injects fuel and steam to the mixed material falling from the gap between the rollers by combining the multi-roller distributing device and the fuel steam injection unit, so that the part of the mixed material is adhered with the fuel and then falls to the upper part of the formed accumulated material on the sintering trolley, thereby increasing the fuel content of the upper material layer, improving the air permeability of the material layer and balancing the heat distribution difference in the vertical direction, and achieving better fuel segregation distribution effect while realizing segregation distribution of the mixed material.
Description
Technical Field
The invention belongs to the technical field of sintering processes, and relates to a segregation material distribution device and method for a sintering machine.
Background
Sintering is an important process for producing steel, and the proportion of sintered ore in the blast furnace burden in China is more than 70%. In the sintering process, due to the action of the negative pressure of air draft, the flue gas carrying heat enters the lower material layer through the upper hot sintering belt, so that the sintering temperature of the lower part of the material layer is higher, the phenomenon is called as the self-heat storage effect of the sintering material layer, and the self-heat storage effect is more obvious when the material layer is thicker. The full utilization of the self-heat storage function can save energy consumption and cost, and production practices show that the solid fuel consumption can be reduced by 10kgce/t when the material layer thickness is increased by 100mm, the utilization coefficient of the sintering machine can be increased by 6.5%, and meanwhile, the thick material layer sintering also has a beneficial effect on reducing the sulfur content in the sintering ore, improving the reducibility of the sintering ore and the like, so that the demand of steel enterprises on the ultra-thick material layer sintering technology is increasingly urgent.
How to further increase the thickness of a material layer, reduce solid fuel consumption by utilizing the automatic heat storage function of the material layer to the maximum extent, improve the quality index of sintered mineral products and have great significance for the development of sintering technology. Wherein, the key for further increasing the thickness of the material layer is to improve the air permeability and the temperature distribution of the material layer.
Segregation distribution of the sintering and homogenizing material on a sintering trolley is an effective means for solving the problems. In an ideal segregation distributing structure formed in the distributing process, the raw materials with small particle size are distributed at the upper part of the material layer, and the raw materials with large particle size are distributed at the bottom of the material layer, so that the air permeability of the material layer can be improved; when the carbon content in the material layer is gradually reduced from top to bottom, the heat can be effectively utilized, thereby ensuring the quality of the sinter and reducing the solid fuel consumption.
Patent CN106949740a discloses a sintered mixture segregation distributing device, which is provided with a multi-stage multi-roller distributing device and an air flow blowing opening, wherein the roller spacing of the lower multi-roller distributing device is not smaller than that of the upper multi-roller distributing device, so that uniform distribution can be effectively realized, and the distribution distance is increased to a certain extent. Patent CN114136094A discloses a sintering mixture segregation distributing device, which is provided with a multi-stage nine-roller distributing device, a multi-stage water spraying pipe opening and a pressing device, so that a flat material plate is not piled, a trolley is not partially lack of materials, the pressing degree is adjusted through the pressing device to achieve the purpose of adjusting the initial air permeability of a sintering material layer, the moisture of the sintering materials of the whole trolley is ensured to be consistent through a spraying device, but the invention does not show a great effect on the fuel distribution in the vertical direction of the material layer. Patent CN114061314a discloses a sintering mixture efficient distributing system, wherein a reflecting plate distributor is arranged between a mixer and a storage bin, the reflecting plate promotes segregation distribution of the sintering mixture in the mixing storage bin, and the segregation material discharged from the mixing storage bin is subjected to secondary segregation distribution by two multi-roller distributors, but efficient segregation distribution of fuel is not achieved; patent CN106959012B discloses a sintering machine distributing device and a method for distributing materials by using the same, which adopts a combination of multi-roller distributing device and air blowing, and adjusts the height of each distributing roller through an adjusting part, so that the size of the gap between different distributing rollers changes, and thus, the size of the material flow entering the sintering machine body from different gap parts also changes, thereby completing the purpose of adjusting the thickness of different parts of different material flow layers on the sintering machine body, and realizing the uniformity of material flow distribution, but the invention has no obvious function on fuel segregation distribution.
The grain size distribution of the sintering material can be optimized by arranging the distributing device, but the prior art cannot achieve efficient fuel segregation distribution while achieving grain size segregation distribution of the sintering material and achieve optimization while achieving permeability and temperature uniformity of a material layer, so that a new segregation distributing device and a new segregation distributing method need to be developed.
Disclosure of Invention
In view of the problems in the prior art, the present invention aims to provide a segregation distributing device and a segregation distributing method for a sintering machine, wherein the segregation distributing device for a sintering machine comprises a feeding device, a multi-roller distributor, a sintering trolley and a fuel steam injection unit, and an injection pipe assembly of the fuel steam injection unit is arranged between the multi-roller distributor and the sintering trolley so as to form a uniform and stable fuel steam phase in the space. The invention injects fuel and steam to the uniform material falling from the gap between the rollers in a mode of combining the multi-roller distributor and the fuel steam injection unit, so that the part of the uniform material adheres to the fuel and then falls to the upper part of the formed accumulated material on the sintering trolley, thereby increasing the fuel content of the upper material layer, improving the air permeability of the material layer and balancing the heat distribution difference in the vertical direction, and achieving better fuel segregation distribution effect while realizing segregation distribution of the uniform material.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a segregation and distribution device for a sintering machine, which comprises a feeding device, a multi-roller distributor, a sintering trolley and a fuel steam injection unit, wherein the feeding device, the multi-roller distributor and the sintering trolley are sequentially arranged from top to bottom according to the flow direction of a mixed material; the fuel vapor injection unit comprises a flue gas inlet.
Different from the air flow segregation material distribution in the prior art, the invention arranges the injection pipe component of the fuel steam injection unit below the multi-roller distributor to form a stable fuel steam phase in the space, so that part of the uniform material falling from the gap between the rollers of the multi-roller distributor passes through the fuel steam phase to be further processed, the uniform material with smaller grain diameter falls on the upper part of the formed stacking material on the sintering trolley after a certain amount of fuel is adhered in the fuel steam phase, the fuel content of the upper material layer is increased, the grain size segregation distribution of the uniform material is realized, simultaneously, the grain size segregation distribution of the whole material layer in the vertical direction is enabled to achieve a better effect, meanwhile, after the processing of the fuel steam phase, the upper small particles absorb the heat of the steam, the temperature of the upper material layer is increased, the air permeability and the vertical heat distribution condition of the material layer are improved, the preheating is realized, and the subsequent ignition sintering is facilitated. It should be noted that the fuel steam injection unit comprises a flue gas inlet, the flue gas inlet is used for providing flue gas to the interior of the sintering machine segregation distributing device, the flue gas can be utilized to fully and uniformly mix fuel and steam in a pipeline and ensure sufficient and stable air pressure, and the waste heat of the flue gas can be effectively utilized to transfer heat to the fuel, so that the fuel can reach a target temperature more quickly, and meanwhile, energy conservation and emission reduction are effectively realized.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferable aspect of the present invention, the blowing pipe assembly includes at least one pair of a blowing pipe a and a blowing pipe B.
Preferably, the surface of the blowing pipe is provided with uniformly equidistant nozzles in the axial direction.
Preferably, the nozzle of the injection tube a is horizontally opposed to the nozzle of the injection tube B.
It should be noted that, although only one blowing tube may be provided in the blowing tube assembly of the present invention, when two blowing tubes are used and the nozzles are disposed to face each other, the space for forming the fuel and the vapor which are ejected to each other is more stable and uniform.
As a preferable technical solution of the present invention, the outlet end of the blowing pipe assembly is provided with a pressure relief valve and a filter in this order.
Specifically, the relief valve a and the filter a are connected to the outlet side of the injection tube a in this order, and the relief valve B and the filter B are connected to the outlet side of the injection tube B in this order.
As a preferred technical scheme of the present invention, the inlet end of the injection tube assembly is connected to a flue gas surge tank through a conveying pipe, and the air inlet of the flue gas surge tank is used as the flue gas inlet of the fuel steam injection unit and is used for providing flue gas to the conveying pipe; and a fuel inlet pipe, a steam inlet pipe, a fuel concentration sensor and a pressure sensor are sequentially arranged on a conveying pipeline between the flue gas pressure stabilizing tank and the injection pipe assembly along the flow direction of flue gas.
As a preferable technical scheme of the invention, an inlet of the fuel inlet pipe is connected with an outlet of the pulverizer, and an air inlet of the pulverizer is connected with an air outlet of the fan.
As a preferred technical solution of the present invention, the fuel concentration sensor is electrically connected to a feedback control system, and the feedback control system is electrically connected to the fan and is configured to adjust an intake of the fuel.
As a preferred embodiment of the present invention, the multi-roll distributor is inclined at an angle of 33 to 43 °, for example, 33 °, 34 °, 35 °, 36 °, 37 °, 38 °, 39 °, 40 °, 41 °, 42 ° or 43 °, but not limited to the values listed above, and other values not listed above are also applicable.
As a preferred embodiment of the present invention, the number of the rollers of the multi-roller distributor is 6 to 9, for example, 6, 7, 8, 9, etc.
Preferably, the individual rollers in the multiple roller distributor are of equal diameter and have a roller spacing of 2 to 8mm, for example 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7.5mm or 8mm, but not limited to the values listed, other values not listed within the above range of values being equally applicable.
Preferably, the feeding means comprises a round roller feeder.
Preferably, the upper part of the round roller feeder is provided with a blending bin.
As the preferable technical scheme of the invention, the flue gas inlet is connected with a superior flue gas circulating pipeline and used for providing flue gas for the conveying pipeline.
Preferably, the temperature of the flue gas discharged from the upper circulation line is 150 to 300 ℃, for example, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃, 260 ℃, 270 ℃, 280 ℃, 290 ℃ or 300 ℃, but is not limited to the recited values, and other values not recited in the above-mentioned range of values are also applicable.
Preferably, the fuel is heated by steam and flue gas together to 80 to 180 ℃, for example 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ or 180 ℃ in the transport duct, but not limited to the recited values, and other values not recited in the above range of values are equally applicable.
The flue gas inlet is connected with the upper-level flue gas circulation pipeline, flue gas with the temperature of 150-300 ℃ in the upper-level flue gas circulation pipeline is used as a carrier for fuel injection and a medium for preheating fuel, effective utilization of waste heat of sintering flue gas is facilitated, the flue gas with the temperature range can heat the fuel to 80-180 ℃ in the conveying process under the cooperation of steam, the temperature of the fuel reaches the target temperature, and preheating of upper-layer mixed materials after segregation distribution is facilitated.
In a second aspect, the invention provides a segregation distributing method for a sintering machine, which utilizes the segregation distributing device for a sintering machine of any one of claims 1 to 9 to enable the sintering trolley to move at a constant speed along a direction opposite to the main discharging direction of the multi-roller distributing device, and the uniformly mixed materials sequentially pass through the feeding device and the multi-roller distributing device and then fall on the sintering trolley; and in the process, a uniform and stable fuel steam distribution phase is formed below the multi-roller distributor through a blowing pipe assembly of the fuel steam blowing unit, so that the mixed material falling from the gap between the rollers of the multi-roller distributor passes through the fuel steam distribution phase and falls to the upper part of the stacked material, and the mixed material and the fuel segregation distribution are completed.
Compared with the prior art, the invention at least has the following beneficial effects:
the invention combines the fuel steam injection unit and the multi-roller distributing device for distributing, can realize reasonable grain size segregation distribution of the mixed material in the vertical direction along the movement of the sintering trolley, optimizes the air permeability of the material layer, and simultaneously realizes better fuel segregation distribution in the vertical direction.
Drawings
FIG. 1 is a schematic structural diagram of a segregation distributing apparatus of a sintering machine according to embodiment 1 of the present invention;
FIG. 2 is a schematic top view of a fuel vapor injection unit according to embodiment 1 of the present invention;
FIG. 3 is a schematic process diagram of a segregation distributing method for a sintering machine according to embodiment 1 of the invention;
in the figure: 1-a round roller feeder, 2-a multi-roller distributor, 3-a sintering trolley, 4-a flue gas surge tank, 5-a fuel inlet pipe, 6-a steam inlet pipe, 7-an injection pipe A, 8-an injection pipe B, 9-a conveying pipeline, 10-a pulverizer, 11-a fan, 12-a pressure sensor, 13-a nozzle, 14-a flue gas inlet, 15-a blending bin, 16-a fuel concentration sensor, 17-a feedback control system, 18-a pressure release valve A, 19-a pressure release valve B, 20-a filter A and 21-a filter B;
figure 4 is a schematic structural view of a blowing tube assembly as described in embodiment 3 of the present invention.
Detailed Description
In order to better explain the present invention and to facilitate an understanding of the technical solutions of the present invention, the following further detailed description of the embodiments of the present invention is provided. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Example 1
The structure schematic diagram of the device for distributing the sintering machine segregation is shown in fig. 1, the device for distributing the sintering machine segregation comprises a round roller feeder 1, a multi-roller distributor 2 and a sintering trolley 3 which are sequentially arranged from top to bottom according to the flow direction of the mixture, and further comprises a fuel steam injection unit, and a blowing pipe assembly of the fuel steam injection unit is arranged between the multi-roller distributor and the sintering trolley so as to form a uniform and stable fuel steam phase in the space; the schematic top view structure of the fuel steam injection unit is shown in fig. 2, and the fuel steam injection unit comprises a flue gas inlet 14;
the blowing pipe assembly comprises a pair of blowing pipes A7 and B8; a row of nozzles 13 with uniform and equal distance are arranged on the surfaces of the blowing pipes A and B along the axial direction; the nozzle 13 of the blowing pipe A7 and the nozzle 13 of the blowing pipe B8 are horizontally arranged opposite to each other; a pressure relief valve and a filter are sequentially arranged at the outlet end of the injection pipe assembly, a pressure relief valve A18 and a filter A20 are sequentially connected to one side of the outlet of the injection pipe A, and a pressure relief valve B19 and a filter B21 are connected to one side of the outlet of the injection pipe B;
the inlet end of the injection pipe assembly is connected with a flue gas pressure stabilizing tank 4 through a conveying pipeline 9, and the gas inlet of the flue gas pressure stabilizing tank 4 is used as a flue gas inlet of the fuel steam injection unit and used for providing flue gas for the conveying pipeline 9; a fuel inlet pipe 5, a steam inlet pipe 6, a fuel concentration sensor 16 and a pressure sensor 12 are sequentially arranged on a conveying pipeline 9 between the flue gas pressure stabilizing tank 4 and the injection pipe assembly along the flow direction of flue gas; the inlet of the fuel inlet pipe 5 is connected to the outlet of the pulverizer 10, and the air inlet of the pulverizer 10 is connected to the air outlet of the fan 11; the fuel concentration sensor 16 is electrically connected to a feedback control system 17, and the feedback control system 17 is electrically connected to the fan 11 and used for adjusting the input amount of fuel;
the upper part of the round roller feeder 1 is provided with a blending bin 15; the number of rolls of multiroll distributing device 2 is 9, and each single roll passes through transmission and rotates the connection, and the diameter is 150mm, and the roll spacing is 4mm, multiroll distributing device 2 is the slope setting, and inclination is 38.
The invention also provides a sintering machine segregation distributing method by using the sintering machine segregation distributing device in the embodiment 1, the process schematic diagram of the method is shown in figure 3, and the method comprises the following steps:
the method uses coal powder as fuel, and makes the sintering trolley 3 move at a constant speed along the direction (as shown by an arrow) opposite to the main discharging direction of the multi-roller distributing device 2, the mixed material falls from a mixing material bin 15, sequentially passes through the round roller feeder 1 and the multi-roller distributing device 2, and then falls on the sintering trolley 3 to form accumulated material;
in the process, the flue gas pressure stabilizing tank 4 connected to the upper stage flue gas circulation pipeline sends flue gas into the conveying pipeline 9, the fan 11 sends pulverized coal in the pulverizer 10 into the conveying pipeline 9 through the fuel inlet pipe 5, and meanwhile, steam is introduced into the conveying pipeline 9 through the steam inlet pipe 6; under the assistance of the flue gas, the pulverized coal and the steam are fully and uniformly mixed in the pipeline, the concentration of the pulverized coal in the pipeline is detected through the fuel concentration sensor 16, the converted electric signal is transmitted to the feedback control system 17, and the control of the fan 11 is realized, so that the concentration of the pulverized coal in the pipeline is changed; the pressure in the pipeline is monitored by the pressure sensor 12, and the input amount of the flue gas and the steam is adjusted, so that the mixed gas phase formed by the pulverized coal and the steam in the pipeline has sufficient air pressure and the supply is kept stable;
at this time, the pulverized coal and steam ejected by the horizontally oppositely arranged injection pipe A7 and the horizontally oppositely arranged injection pipe B8 can form a uniform and stable pulverized coal steam phase in the space below the multi-roller distributor 2, so that part of the uniform material falling from the gap between the rollers of the multi-roller distributor 2 is processed by the pulverized coal steam phase and adheres to the pulverized coal, and then falls to the upper part of the accumulated material on the sintering trolley 3, thereby completing the material mixing and fuel segregation distribution.
Example 2
The segregation distributing device for the sintering machine is provided in the embodiment, the injection pipe assembly in the fuel steam injection unit is only composed of one injection pipe, a row of nozzles with uniform equal distance are arranged on the surface of the injection pipe along the axial direction, the gas injection direction of the nozzles is parallel to the horizontal plane, a stable pulverized coal steam phase is formed in the lower space of the multi-roller distributor through the nozzles, and except for the adjustment, other conditions in the segregation distributing device for the sintering machine in the embodiment are completely the same as those in the embodiment 1.
Example 3
The embodiment provides a segregation distributing device of a sintering machine, wherein the injection pipe assembly in the fuel steam injection unit comprises two pairs of injection pipes A and B (shown in figure 4); the blowing pipes are arranged in parallel to the horizontal plane and are sequentially and alternately arranged in a mode of blowing pipe A/blowing pipe B/blowing pipe A/blowing pipe B, and a row of nozzles which are uniformly and equidistantly arranged along the axial direction are arranged on the surfaces, which are opposite to each other, of two adjacent blowing pipes A and B in the horizontal direction, so that the nozzles of the two adjacent blowing pipes A and B are horizontally opposite; the stable coal powder steam phase is formed in the lower space of the multi-roller distributor through the nozzles, and except for the adjustment, other conditions in the segregation and distribution device of the sintering machine in the embodiment are completely the same as those in the embodiment 1.
Comparative example 1
The comparative example provides a segregation and distribution device for a sintering machine, which is different from the segregation and distribution device in example 1 in that the device does not comprise a fuel vapor injection unit, namely, the device comprises a blending bin, a round roller feeder, a multi-roller distributor and a sintering trolley which are sequentially arranged from top to bottom according to the flow direction of the blending; the blending material falls into from the blending feed bin in proper order on round roller feeder, the multiroll distributing device and the sintering pallet, forms the pile material.
Respectively distributing the same uniform mixture A provided by the previous step in the segregation distributing devices of the sintering machines provided in examples 1 to 3 and comparative example 1, wherein the carbon content of the uniform mixture A is 4.15%; for the piled material layer of which the cloth is finished, JPU = (Q/A) × (H/delta P) according to the Voice formula 0.6 Wherein Q represents the amount of air passing through the bed, in m 3 Min; a represents the cross-sectional area of the bed in m 2 (ii) a H represents the thickness of the material layer and the unit mm; delta P represents the negative pressure of air draft, unit 10 4 Pa, calculating the air permeability index JPU of the stacking material layer as an index of segregation distribution of the uniformly mixed material to reflect the segregation effect of particle size distribution; meanwhile, the upper, middle and lower parts of the stacking material layer were sampled, and the carbon content was measured as an index for quantifying the fuel content to reflect the effect of fuel segregation distribution, and the obtained results are shown in table 1.
Further, in order to better exhibit the material distribution effect of the present invention and to be suitable for practical production, the blending material B, the blending material C, and the blending material D, which have carbon contents of 3.95%, 4.10%, and 3.80% respectively in the previous step, are applied to examples 1, 2, and 3, respectively, so that the total carbon content in the stacked material layer after the material distribution of each example is completed is consistent and close to the total carbon content of the stacked material layer obtained after the material distribution of the blending material a in comparative example 1, so as to enhance the material distribution effect by comparison, and the obtained results are shown in table 2.
TABLE 1
TABLE 2
As can be seen from table 1:
the air permeability of examples 1, 2 and 3 is slightly improved compared with that of comparative example 1, and the improvement effect is more obvious as the number of the blowing pipes is increased;
the total carbon content of the resulting buildup material layer in the example was increased with the increase in the number of the injection pipes, and specifically, the difference in carbon content between the lower and middle portions of the buildup material layer obtained in the example was small compared to that in comparative example 1, the main change was the change in carbon content in the upper portion, and the more the carbon content in the upper portion layer was increased with the increase in the number of the injection pipes, the final total carbon content was gradually increased.
As can be seen from table 2:
when the materials are distributed in each example by using the mixed materials with different carbon contents, each piled material layer with approximate total carbon content or average carbon content can be obtained, and the air permeability of examples 1, 2 and 3 is still effectively improved compared with that of comparative example 1;
because of the influence of the carbon content of the mixed material, the carbon contents of the middle part and the lower part of the stacking material layer of the comparative example 1 are higher than those obtained in each embodiment, but because the invention can achieve better distribution effect of fuel segregation, the carbon content of the upper layer of each embodiment is further optimized, and the fuel segregation effect is better than that of the comparative example 1; in example 2 in which only one blowing pipe is provided, compared with example 1 in which a pair of blowing pipes is provided, the carbon content of the kneaded material in the upper layer of example 2 is low, and the fuel segregation effect of example 1 is good, but the fuel segregation effect of example 2 is better than that of comparative example 1; compared with the embodiment 1 provided with a pair of injection pipes, the embodiment 3 provided with four injection pipes has higher carbon content of the upper-layer mixture, better fuel segregation effect of the embodiment 3 and better fuel segregation effect than that of the comparative example 1;
from the comparative analysis, the invention can find that the carbon content of the upper material layer is improved and the fuel segregation effect is improved while the grain size segregation of the blending material is kept by arranging the fuel steam injection unit below the multi-roller distributor, and the fuel segregation effect is enhanced when the number of the injection pipes is increased.
The present invention is described in detail with reference to the above embodiments, but the present invention is not limited to the above detailed structural features, that is, the present invention is not meant to be implemented only by relying on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The device for distributing the sintering machine in the segregation manner is characterized by comprising a feeding device, a multi-roller distributing device, a sintering trolley and a fuel steam injection unit, wherein the feeding device, the multi-roller distributing device and the sintering trolley are sequentially arranged from top to bottom according to the flow direction of a mixed material; the fuel vapor injection unit comprises a flue gas inlet.
2. The apparatus for segregation distributing materials of a sintering machine according to claim 1, wherein the blowing pipe assembly comprises at least one pair of a blowing pipe A and a blowing pipe B;
preferably, the surface of the blowing tube assembly is provided with uniformly equidistant nozzles in the axial direction;
preferably, the nozzle of the injection tube a is horizontally opposed to the nozzle of the injection tube B.
3. The segregation distributing device of the sintering machine according to claim 1 or 2, wherein the outlet end of the blowing pipe assembly is provided with a pressure relief valve and a filter in sequence.
4. The segregation distributing device of the sintering machine according to any one of claims 1 to 3, wherein the inlet end of the injection pipe assembly is connected with a flue gas surge tank through a conveying pipe, and the gas inlet of the flue gas surge tank is used as the flue gas inlet of the fuel steam injection unit and used for supplying flue gas to the conveying pipe; and a fuel inlet pipe, a steam inlet pipe, a fuel concentration sensor and a pressure sensor are sequentially arranged on a conveying pipeline between the flue gas pressure stabilizing tank and the injection pipe assembly along the flow direction of the flue gas.
5. The segregation distributing device of the sintering machine according to claim 4, wherein the inlet of the fuel inlet pipe is connected to the outlet of the grinding machine, and the air inlet of the grinding machine is connected to the air outlet of the fan.
6. The segregation distributing device of the sintering machine according to claim 5, wherein the fuel concentration sensor is electrically connected to a feedback control system, and the feedback control system is electrically connected to the fan for adjusting the feeding amount of the fuel.
7. The segregation distributing device of the sintering machine according to any one of claims 4 to 6, wherein the multi-roller distributor is arranged obliquely and the inclination angle is 33-43 degrees.
8. The segregation distributing device of the sintering machine according to any one of claims 4 to 7, wherein the number of the rollers of the multi-roller distributing device is 6 to 9;
preferably, the diameters of the single rollers in the multi-roller distributor are equal, and the roller spacing is 2-8 mm;
preferably, the feeding device comprises a round roller feeder;
preferably, the upper part of the round roller feeder is provided with a blending bin.
9. The segregation distributing device of the sintering machine according to any one of claims 4 to 8, wherein the flue gas inlet is connected with a superior flue gas circulation pipeline for supplying flue gas to the conveying pipeline;
preferably, the temperature of the flue gas output by the upper-stage circulating pipeline is 150-300 ℃;
preferably, the fuel is heated by steam and flue gas together to 80-180 ℃ in the conveying pipeline.
10. A segregation and distribution method for a sintering machine, which is characterized in that the segregation and distribution device for the sintering machine of any one of claims 1 to 9 is utilized to enable the sintering trolley to move at a constant speed along the direction opposite to the main discharging direction of the multi-roller distributor, and the uniformly mixed materials sequentially pass through the feeding device and the multi-roller distributor and then fall on the sintering trolley; during the process, a uniform and stable fuel steam distribution phase is formed below the multi-roller distributor through a blowing pipe assembly of the fuel steam blowing unit, so that the mixed material falling from gaps among the rollers of the multi-roller distributor passes through the fuel steam distribution phase and falls to the upper part of the stacked material to finish the mixed material and fuel segregation distribution.
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