CN114251948B - Sintered fuel segregation distributing device and method - Google Patents
Sintered fuel segregation distributing device and method Download PDFInfo
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- CN114251948B CN114251948B CN202011003581.6A CN202011003581A CN114251948B CN 114251948 B CN114251948 B CN 114251948B CN 202011003581 A CN202011003581 A CN 202011003581A CN 114251948 B CN114251948 B CN 114251948B
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- trolley
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- sintering
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0003—Heating elements or systems with particulate fuel, e.g. aspects relating to the feeding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0001—Positioning the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of steel sintering processes, in particular to a sintering fuel segregation distribution device and a sintering fuel segregation distribution method. The sintering fuel segregation distributing device is connected between the mixing tank and the trolley below the mixing tank. The device comprises a raw material distribution mechanism and a gas particle distribution mechanism. The material distributing mechanism is connected between the material mixing groove and the trolley and is used for guiding the raw materials mixed with the solid fuel to form a raw material belt between the material mixing groove and the trolley; the gas granule distributing mechanism is connected above the trolley, and is provided with a plurality of distributing openings for throwing gas granules on the trolley, and each distributing opening is arranged behind the raw material belt in sequence by taking the travelling direction of the trolley as the front. The device can change the material layer structure of the sintering mixture by using the sintering fuel segregation distribution method so as to reduce the fuel quantity in the material layer structure formed in the sintering system, thereby effectively reducing the carbon emission of the sintering system and realizing energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of steel sintering processes, in particular to a sintering fuel segregation distribution device and a sintering fuel segregation distribution method.
Background
As a key link in iron and steel industry iron making process, the sintering process mainly comprises the steps of mixing various powdery iron-containing raw materials with proper amount of fuel and flux, adding proper amount of water, mixing and pelletizing, making the materials undergo a series of physical and chemical changes on sintering equipment, sintering into blocks, and conveying the blocks to a blast furnace for the next blast furnace process. The higher the strength and reducibility of the sinter entering the blast furnace, the lower the consumption of coke in blast furnace smelting, thereby reducing CO 2 And (5) discharging. The sinter produced by the sintering process is therefore generally required to have higher strength, high yield, lower return yield, and lower fuel consumption.
In the existing sintering system, the solid arrow in fig. 1 shows the combustion direction of the material layer 6, and after the fuel on the upper part of the material layer 6 is ignited, sintering proceeds from top to bottom through the action of air suction. Due to the heat accumulation of the sinter bed, the heat of the upper bed is transferred to the lower bed along with the flue gas, and the heat required by the fuel from top to bottom of the bed 6 is gradually reduced in ideal conditions. In practice, some large-particle fuel rolls to the bottom of the material layer 6 in the process of distributing materials in the sintering system, so that the fuel distribution of the material layer 6 is in a structure with high solid fuel at the lower part and low solid fuel at the middle and upper parts, and the problem that the upper heat of the material layer 6 is insufficient and the middle and lower heat of the material layer 6 is excessive in the sintering material layer during sintering production is caused, so that the sintering production quality is reduced, and meanwhile, pollutants in smoke are increased.
Aiming at the problems in the sintering process, in the prior art, a blowing device shown in fig. 1 can be additionally arranged in a sintering system, the blowing device consists of a blowing main pipe 1, a blowing branch pipe 2, a blowing pipe 8 and a blowing hole 7, a top sealing element 3 and a side sealing element 4 are additionally arranged outside an existing trolley 5, during production, combustible gas enters the blowing main pipe 1 from a factory gas pipeline, then enters the blowing branch pipe 2, finally enters the blowing pipe 8, is sprayed out through the blowing hole 7 arranged at the end part of the blowing pipe 8, and is mixed and diluted with air in a blowing cover formed by the top sealing element 3 and the side sealing element 4, so that mixed gas meeting the concentration requirement is formed, and the mixed gas can enter the interior of a material layer 6 to assist sintering. The internal combustion heat supply of the sinter bed is realized by carrying out gas fuel injection on the material surface of the sinter bed, namely: in the sintering process, after the solid fuel proportion of the sintering raw materials is integrally reduced, the gas fuel diluted below the lower explosion limit is blown above the sintering material surface positioned at a certain distance behind the ignition furnace through a blowing device, so that the gas fuel is combusted in the sintering material layer, and the heat required by completing sintering at the upper middle part of the material layer 6 is supplemented. The blowing device is arranged to add fuel to the material layer 6 twice during sintering to replace part of the solid carbon fuel in the material layer, and the larger the amount of fuel gas sucked into the material layer is, the more the solid carbon fuel is reduced. However, since the gas injection concentration is limited by safety factors such as explosion limit and gas diffusion, there is a maximum threshold for the gas injection concentration of the material layer 6, and the gas permeability of the material layer 6 also limits the gas suction of the material surface, the carbon reduction amount of the injection device is limited. In addition, the gas combustion position entering the material layer is positioned behind the combustion zone, so that great contribution is difficult to the improvement of the front of the combustion zone and the highest temperature in the combustion zone in the sintering process, and the effect of substituting the solid fuel by the gas is further weakened.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a sintering fuel segregation distribution device, which changes the material layer structure of a sintering mixture by using segregation distribution so as to solve the problem of non-ideal fuel distribution of the existing sintering system and the problem of insufficient carbon reduction caused by limited gas suction amount and a rear combustion position after a gas injection device is added.
The invention also provides a segregation distribution method of the sintered fuel.
According to the embodiment of the first aspect of the invention, the sintering fuel segregation distribution device is connected between the mixing tank and the trolley below the mixing tank; the sintered fuel segregation distributing device comprises:
the raw material distributing mechanism is connected between the mixing tank and the trolley and used for guiding raw materials mixed with solid fuel to form a raw material belt between the mixing tank and the trolley;
the gas granule distributing mechanism is connected to the upper part of the trolley, and is provided with a plurality of distributing openings for putting gas granules on the trolley, the travelling direction of the trolley is taken as the front, and the distributing openings are sequentially arranged at the rear of the raw material belt.
According to one embodiment of the invention, the gas granule distribution mechanism comprises:
the gas particle storage bin is internally stored with gas particles, and compressed gas is filled in the gas particles;
and one end of the material conveying channel is communicated with the gas particle storage bin, a plurality of material distributing openings are formed in the other end of the material conveying channel, and the material distributing openings are sequentially arranged above the trolley.
According to one embodiment of the invention, the plurality of distribution openings comprise a first distribution opening, a second distribution opening and a third distribution opening which are sequentially arranged behind the raw material belt from back to front, and the diameters of the first distribution opening, the second distribution opening and the third distribution opening are respectively L 1 、L 2 And L 3 Has L 1 ＞L 2 ＞L 3 The method comprises the steps of carrying out a first treatment on the surface of the The number of the gas particles passing through the first distribution port, the second distribution port and the third distribution port is Q 1 、Q 2 And Q 3 With Q 1 ＞Q 2 ＞Q 3 。
According to one embodiment of the invention, the material conveying channel is horizontally arranged above the trolley, and the bottom plate of the material conveying channel is arranged at a preset angle with the horizontal plane, and the preset angle ranges from 5 degrees to 15 degrees; the first material distribution port and the second material distribution port are respectively arranged at the bottom of the material conveying channel and respectively face the trolley, and the third material distribution port is arranged on the end face of the material conveying channel.
According to one embodiment of the present invention, the raw material distribution mechanism includes:
the distributing device is arranged between the mixing tank and the trolley and can drive the raw materials to move forwards from the mixing tank through rotation;
the material guide plate is positioned in front of the distributing device so that the raw materials fall on the material guide plate, the material guide plate is obliquely arranged above the trolley, and the oblique direction of the material guide plate is opposite to the outflow direction of the raw materials;
the material leveling plate is obliquely arranged above the trolley and positioned in front of the material guiding plate, and one end of the material leveling plate is level with the upper surface of the trolley;
the distributor comprises a guide roller, wherein the axis of the guide roller is parallel to the width direction of the trolley, and the rotation direction of the guide roller is clockwise from front to back;
wherein, be equipped with on the blending tank towards the feed inlet of distributing device, install the gate on the feed inlet.
A sintered fuel segregation distribution method according to an embodiment of the second aspect of the present invention is performed by the sintered fuel segregation distribution device described above, or by the sintering system described above;
the sintering fuel segregation distribution method comprises the following steps:
in the process that the raw material distributing mechanism fills the raw material mixed with the solid fuel into the trolley, the gas particles are mixed into the raw material from bottom to top and back to front by utilizing each distributing opening of the gas particle distributing mechanism so as to construct the sintering mixture with a material layer structure in segregation distribution in the trolley.
According to one embodiment of the invention, the material layer structure comprises a first material layer structure formed before sintering starts, the first material layer structure comprises a raw material mixed with solid fuel and a plurality of gas particles, the raw material is filled in the trolley, and the gas particles are mixed in the raw material in a segregation distribution.
According to one embodiment of the invention, the volume of each of the gas particles in the first bed structure gradually decreases from bottom to top.
According to one embodiment of the invention, the gas particles comprise a capsule wall and compressed gas, the capsule wall is internally provided with an inner cavity in a sealing structure, and the capsule wall is made of a combustible organic material; the compressed fuel gas is filled in the inner cavity, and is hydrogen, natural gas or coke oven gas.
According to an embodiment of the present invention, the sintered fuel segregation distribution method further includes:
the material layer structure further comprises a second material layer structure formed in the sintering process, wherein the cross-section structure formed by the second material layer structure comprises an original material belt, an overwetting belt, a drying preheating belt, a combustion belt and a sintering ore belt which are arranged in the trolley from bottom to top, and the gas particles are mixed in the raw materials filled in the original material belt, the overwetting belt and the drying preheating belt.
The above technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the embodiment of the invention relates to a sintering fuel segregation distributing device which is connected between a mixing tank and a trolley positioned below the mixing tank. The sintering fuel segregation distributing device comprises a raw material distributing mechanism and a gas particle distributing mechanism. The material distributing mechanism is connected between the material mixing groove and the trolley and is used for guiding the raw materials mixed with the solid fuel to form a raw material belt between the material mixing groove and the trolley; the gas granule distributing mechanism is connected above the trolley, and is provided with a plurality of distributing openings for throwing gas granules on the trolley, and each distributing opening is arranged behind the raw material belt in sequence by taking the travelling direction of the trolley as the front. The device utilizes the positional relationship formed between a plurality of cloth openings and the raw material belt, and can utilize each cloth opening to mix gas particles into the raw material from bottom to top and back to front in the process of filling the raw material mixed with solid fuel into the trolley so as to construct a material layer structure with segregation distribution in the trolley. Therefore, the device can change the material layer structure of the sintering mixture by utilizing the segregation cloth, so that more fuel gas particles tend to be distributed at the lower part of the material layer structure, and occupy part of the solid fuel distribution space, and therefore, the segregation distribution of the combustion heat value on the vertical height of the material layer structure is realized during material distribution, and better carbon reduction effect can be obtained compared with the prior art.
Furthermore, the sintering fuel segregation distribution device can also ensure that the material layer structure has high-efficiency and high-quality sintering effect by mixing gas particles into the raw materials mixed with the solid fuel, and simultaneously can effectively replace part of the solid fuel by the gas particles so as to reduce the fuel quantity of the material layer structure formed in the sintering system, thereby effectively reducing the carbon emission of the sintering system and realizing energy conservation and emission reduction.
The method for distributing the sintered fuel segregation is carried out by the device for distributing the sintered fuel segregation. According to the method, the raw material distribution mechanism and the gas particle distribution mechanism are respectively utilized to synchronously distribute materials into the trolley, so that a sintering mixture with a material layer structure in segregation distribution is constructed in the trolley. According to the method, the vertical section structure of the sintering mixture can be changed by utilizing segregation cloth, and by mixing gas particles in the raw materials mixed with the solid fuel, the gas particles can be utilized to effectively replace part of the solid fuel while ensuring that the material layer structure has a high-efficiency high-quality sintering effect, so that the fuel quantity of the material layer structure formed in the sintering system is reduced, the carbon emission of the sintering system is effectively reduced, and the energy conservation and emission reduction are realized.
Furthermore, according to the sintering fuel segregation distribution method, the gas particles are mixed into the raw materials according to segregation distribution by using the sintering fuel segregation distribution device in operation, when the outer wall of the gas particles burns and breaks, the internal compression combustion of the material layer structure can slightly explode outwards, corresponding shock waves are generated for the material layer structure, the improvement of the internal air permeability of the material layer structure is facilitated, and therefore the sintering quality is improved.
Still further, in the method for distributing the segregated sintered fuel, according to the ignition direction of the fuel gas, the material layer structure is provided with the combustion zone on the cross-section structure formed in the sintering process, the combustion zone moves downwards from top to bottom along the vertical direction of the cross-section structure of the material layer structure, the ignition combustion position of the fuel gas is always kept below the combustion zone, the released heat and the combustion released heat of the solid fuel are directly used for heating the raw materials at the position of the combustion zone so as to maintain the decomposition of the raw materials and the high temperature required by forming the liquid phase, a series of problems that the ignition position of the fuel gas is above the combustion zone, the heat released by combustion needs to heat the sub-high temperature zone, the contribution to the improvement of the highest temperature of the lower front line of the combustion zone and the inside of the combustion zone in the sintering process is weak, the combustion position is uncontrollable, the effect of the fuel gas replacing the solid fuel is finally weakened and the like are avoided, and therefore, the high-hydrogen low-carbon sintering with higher efficiency can be realized finally.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a conventional blowing device;
FIG. 2 is a schematic view of a sintered fuel segregation distribution device according to an embodiment of the present invention installed in a sintering system;
FIG. 3 is a schematic structural view of a sintered fuel segregation distribution device according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a gas capsule of an embodiment of the present invention;
FIG. 5 is a schematic view of a first layer structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second material layer structure according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another structure of the first material layer according to an embodiment of the present invention.
Reference numerals:
1: blowing a main pipe; 2: blowing a branch pipe; 3: a top seal; 4: a side seal; 5: an existing trolley; 6: a material layer; 7: blowing holes; 8: a blowing pipe;
9: gas particles; 91: compressing the fuel gas; r1: an inner diameter; delta: thickness;
10: a raw material bin; 11: a primary mixing chamber; 12: a secondary mixing chamber; 13: a material distribution bin; 14: igniting a furnace; 15: a trolley; 151: a flue; 152: an exhaust fan;
16: a material flattening plate; 17: a material guide plate; 18: a distributing device; 19: a material mixing groove; 20: a gate; 21: a gas granule storage bin; 22: a material conveying channel; 23: a first cloth port; 24: a second cloth port; 25: a third cloth port;
26: an original material belt; 27: overwet belt; 28: drying the preheating zone; 29: a combustion zone; 30: a sinter belt.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
As shown in fig. 2 to 7, an embodiment of the present invention provides a sintered fuel segregation distribution device (simply referred to as "distribution device" in the embodiment of the present invention), and a sintering system is proposed based on the distribution device.
As shown in fig. 2, in the sintering system, a distributing device is connected between a mixing tank 19 and a trolley 15 positioned below the mixing tank 19, so that raw materials mixed with solid fuel and gas particles 9 are mixed and filled into the trolley 15, the fuel combustion amount in a material layer structure constructed in the trolley 15 is made into segregation distribution, meanwhile, the segregation distribution of the total heat value of the fuel in the distributing process is realized, high-hydrogen low-carbon efficient sintering is realized, and the cleanliness and environmental friendliness of a sintering process are improved.
It is understood that the segregation distribution of the total heating value of the fuel means: in the process of material distribution, the vertical direction along the section structure of the material layer structure is the advancing direction of the combustion belt 29 from top to bottom, so that the total combustion amount of the fuel gas particles 9 and the solid fuel distributed from top to bottom of the material layer structure is gradually reduced, the quality index of a finished product can be greatly improved under the same fuel consumption index, or the fuel consumption index can be greatly reduced under the same quality index of the finished product, and the purposes of energy conservation and carbon emission reduction are achieved.
As shown in fig. 3, the distributing device comprises a raw material distributing mechanism and a gas granule distributing mechanism. Wherein the raw material distributing mechanism is connected between the mixing tank 19 and the trolley 15 and is used for guiding the raw materials mixed with the solid fuel to form a raw material belt between the mixing tank 19 and the trolley 15; the gas granule distributing mechanism is connected in the top of platform truck 15, and gas granule distributing mechanism is equipped with a plurality of and is used for throwing in the cloth mouth of gas granule on the platform truck 15 to the advancing direction of platform truck 15 is the place ahead, and each cloth mouth is arranged in the rear of raw materials area in proper order. The positional relationship formed between the plurality of distributing openings and the raw material belt can enable the raw material belt to be paved into the trolley 15 from front to back in an inclined manner, and meanwhile, gas particles can be mixed into the raw material from back to front from bottom to top, so that a material layer structure with segregation distribution is formed in the trolley 15.
Therefore, the device can change the vertical structure of the sintering mixture by utilizing segregation cloth, and can effectively replace part of solid fuel by utilizing the gas particles 9 while ensuring the high-efficiency and high-quality sintering effect of the material layer structure by mixing the gas particles 9 into the raw materials mixed with the solid fuel so as to reduce the fuel quantity of the material layer structure formed in the sintering system, thereby effectively reducing the carbon emission of the sintering system and realizing energy conservation and emission reduction. Furthermore, the sintered fuel segregation distribution device can also enable more gas particles 9 to be prone to be distributed at the lower part of the material layer structure and occupy part of the solid fuel distribution space, so that segregation distribution of combustion heat value in the vertical height direction of the material layer structure can be realized in the distribution process, and better carbon reduction effect can be obtained compared with the prior art.
In one embodiment, as shown in fig. 3, the raw material distribution mechanism includes a distributor 18 and a guide plate 17. The distributor 18 is installed between the mixing tank 19 and the carriage 15, and the distributor 18 can move forward from the mixing tank 19 by rotating and driving the raw material, and moves forward in a parabolic manner with the rotation of the distributor 18. The material guiding plate 17 is positioned in front of the distributing device 18 so that the raw material travels in a parabolic manner and falls on the material guiding plate 17, the material guiding plate 17 is obliquely arranged above the trolley 15, and the oblique direction of the material guiding plate 17 is opposite to the outflow direction of the raw material, so that the raw material is guided along the material guiding plate 17 obliquely from front to back and paved in the trolley 15, the gas particles 9 are mixed into the raw material to form a sintering mixture filled in the inner groove of the trolley 15 in the trolley 15, and the sintering mixture is sent into the ignition furnace 14 positioned in front of the distributing structure to be ignited and sintered. The guide plate 17 can increase the mixing area of the raw material band during mixing of the gas particles 9 into the raw material band, and the distribution of the gas particles 9 in the raw material band can follow the segregation distribution rule of the total fuel value.
In one embodiment, the distributor 18 preferably comprises a guide roller. The axis of the guide roller is parallel to the width direction of the trolley 15, and the rotation direction of the guide roller is clockwise from front to back, namely, the section of the guide roller of the distributor 18 shown in fig. 3 is clockwise, so that the raw materials can be enabled to be impacted on the guide plate 17 forwards in a throwing arc under the rotation drive of the guide roller, and are uniformly filled in the trolley 15 from front to back, from top to bottom and obliquely under the guiding action of the guide plate 17.
In one embodiment, a feed inlet facing the distributor 18 is preferably provided on the mixing tank 19, and a gate 20 is mounted on the feed inlet, and the flow rate of the raw material can be controlled by opening and closing the gate 20.
In one embodiment, the raw material distribution mechanism further comprises a flat material plate 16. The flat plate 16 is obliquely arranged above the trolley 15 and in front of the guide plate 17, and one end of the flat plate 16 is flush with the upper surface of the trolley 15. The material leveling plate 16 plays a role in leveling the top of the material layer structure filled with the trolley 15, so that the sintered mixture is guaranteed to be leveled and filled in the trolley 15, and the structural reliability of the material layer structure is improved.
In one embodiment, as shown in fig. 3, the gas granule distribution mechanism includes a gas granule storage bin 21 and a feed passage 22. The gas particles 9 are stored in the gas particle storage bin 21, and compressed gas 91 is filled in the gas particles 9. One end of the material conveying channel 22 is communicated with the gas particle storage bin 21, and a plurality of material distributing openings are formed in the other end of the material conveying channel 22. The cloth ports are arranged above the carriage 15 in order. Since the distribution openings are arranged behind the material guiding plate 17 from back to front, in order to ensure that the gas particles 9 can be mixed into the surface of the raw material belt sequentially or simultaneously in the process of the raw material belt obliquely flowing into the trolley 15, the gas particles 9 are mixed into the raw material from back to front and from bottom to top, and part of solid fuel mixed in the raw material is replaced by the gas particles 9.
It will be appreciated that the sinter mix filled in the trolley 15 according to the embodiment of the invention has a layer structure comprising the gas particles 9 and the solid fuel-mixed raw material. The raw material is uniformly filled in the carriage 15, and the gas particles 9 are mixed in the raw material, the gas particles 9 being in the layer structure. Preferably, the gas particles 9 are solid coal dust particles. As shown in fig. 4, the gas particles 9 comprise a capsule wall and compressed gas 91, wherein an inner cavity is formed in the capsule wall in a sealing way, and the capsule wall is made of combustible organic materials; the compressed gas 91 fills the cavity. The compressed gas 91 in the gas particles 9 is preferably hydrogen or natural gas or coke oven gas. The capsule wall of the gas particles 9 is preferably made of a combustible organic material and is configured in the form of a sphere or other capsule shape, for example, it can be made in the form of a capsule. A quantity of pressurized compressed gas 91 is encased within a sealed lumen of the wall construction by a sealed wall. The pressure of the compressed gas 91 is selected according to the manufacturing process, cost and material compressive strength of the capsule wall of the gas pellet 9. Taking the sphere capsule wall as an example, the sphere inner diameter R1 of the gas particles 9 is preferably 3 mm to 5 mm, and can accommodate a volume of compressed gas 91 of about 0.11 ml to 0.52 ml. The thickness delta of the capsule wall is preferably 0.5 mm to 1 mm to ensure that it can withstand the internal gas pressure and extrusion of the external mix.
The wall material of the gas particles 9 is preferably one of aerogel composite material, high temperature resistant inorganic nano composite material and high temperature resistant halogen-free flame retardant silicone rubber composite material, so that the wall has certain compressive strength and good sealing property, the gas particles 9 sealed with compressed gas 91 can bear the extrusion of internal pressure and external mixture in the sintering mixture and no gas leakage occurs, and meanwhile, the wall of the gas particles 9 can melt or burn within the range of at least 900-1100 ℃ to release the compressed gas 91 wrapped inside. The product of the wall of the gas particle 9 after combustion is CO 2 And H 2 O, will not contain toxic or environmentally polluting products.
In one embodiment, as shown in fig. 3, in order to drive the gas particles 9 in the feed passage 22 from the gas particle storage bin 21 toward the end provided with the distribution port, it is preferable that the feed passage 22 is placed flat above the carriage 15, and the bottom plate of the feed passage 22 is disposed at a preset angle with respect to the horizontal plane, the preset angle ranging from 5 degrees to 15 degrees, and the distribution port is disposed at the lowest position of the bottom plate.
In one embodiment, the plurality of cloth orifices includes a first cloth orifice 23, a second cloth orifice 24, and a third cloth orifice 25 sequentially arranged from back to front behind the raw material strip. Preferably, the first distribution port 23 and the second distribution port 24 are respectively arranged at the bottom of the material conveying channel 22 and respectively arranged towards the trolley 15, and the third distribution port 25 is arranged on the end surface of the material conveying channel 22, so that the three distribution ports respectively have different heights relative to the trolley 15, and the heights of the first distribution port 23, the second distribution port 24 and the third distribution port 25 are respectively increased one by one, so that the process of ensuring that the gas particles 9 flow out of the three distribution ports can be matched with the inclination degree of the raw material belt.
In one embodiment, the apertures of the first cloth opening 23, the second cloth opening 24 and the third cloth opening 25 are L respectively 1 、L 2 And L 3 Has L 1 ＞L 2 ＞L 3 . Since more gas particles 9 pass through the larger-caliber distribution openings at the same time, the quantity of the gas particles 9 respectively pass through the first distribution opening 23, the second distribution opening 24 and the third distribution opening 25 is Q 1 、Q 2 And Q 3 With Q 1 ＞Q 2 ＞Q 3 . The travelling route of the trolley 15 is shown by an arrow in fig. 3, so that in the process of distributing by the distributing device, in the cross-section structure of the material layer structure in the trolley 15, the number of the gas particles 9 can be changed from bottom to top, and the distribution state of the gas particles 9 is shown in fig. 5.
In consideration of the fact that the combustion heat release amount of the solid fuel mixed in the raw materials is larger than the gas combustion heat release amount after the gas particles 9 are melted under the unit volume, more gas particles 9 occupy more solid fuel space at the bottom of the material layer structure, compared with the situation that the method is not adopted, the distribution amount of the solid fuel at the bottom of the material layer structure is smaller, and the distribution amount of the solid fuel at the top of the material layer structure is larger, so that in the cross section structure of the material body structure formed after material distribution, the heat value distribution of the fuel is gradually increased from bottom to top according to the vertical height direction, the segregation distribution of the combustion heat value is realized in the material distribution process of the material distribution device, the more heat is released in the material layer combustion process of the sintered mixture formed after material distribution in the material distribution process, the heat released in the material layer combustion process of the material layer near the top is relatively less, the material layer near the bottom is not excessive while the material layer heat near the top is sufficient can be ensured.
As shown in fig. 2, the sintering system according to the embodiment of the present invention includes a mixing device, a material distributing bin 13, a trolley 15, an ignition furnace 14, and an air exhausting device. The material distributing bin 13 and the ignition furnace 14 are arranged above the trolley 15 along the travelling direction of the trolley 15, so that the material distributing bin 13 is used for constructing the sintering mixture according to the embodiment of the invention into the trolley 15, and the distributed sintering mixture is sent to the position below the ignition furnace 14 for sintering along with the travelling of the trolley 15. Wherein, the compounding device is connected with cloth storehouse 13, and the compounding device is used for mixing and pelletization with solid fuel with the raw materials to obtain the raw materials that mixes the solid fuel according to the embodiment of the invention. It is understood that the raw materials in the embodiment of the invention are all raw materials mixed with solid fuel except the raw materials in the raw material bin. A mixing tank 19 is arranged in the material distribution bin 13, and the sintering fuel segregation material distribution device is arranged between the mixing tank 19 and the trolley 15. The exhaust device is arranged at the bottom of the trolley 15 so as to extract flue gas formed in the sintering process in the trolley 15, play a role in promoting flue gas emission, ensure that combustion heat of the sintering mixture in the sintering process is segregated, reasonably distribute heat of the upper part, the middle part and the lower part of the sintering mixture, and meet heat requirements of all positions so as to realize a high-efficiency high-quality high-hydrogen low-carbon sintering process. By arranging the sintering fuel segregation distribution device, the sintering system has all the advantages of the sintering fuel segregation distribution device, and detailed description is omitted.
In one embodiment, the mixing device comprises a raw material bin 10 and at least one mixing chamber, wherein the raw material bin 10 and each mixing chamber are sequentially connected to a feed inlet of a material distributing bin 13. Preferably, the at least one mixing chamber comprises a primary mixing chamber 11 and a secondary mixing chamber 12, the primary mixing chamber 11 and the secondary mixing chamber 12 are sequentially connected between the raw material bin 10 and the material distribution bin 13, and the primary mixing chamber 11 and the secondary mixing chamber 12 are used for mixing and granulating so as to mix the raw materials and the solid fuel uniformly and sufficiently through twice full mixing.
In one embodiment, the suction device includes a flue 151 and a suction fan 152. The flue 151 is arranged below the trolley 15, one end of the flue 151 is connected with the exhaust fan 152, a plurality of exhaust openings which are arranged at intervals along the travelling direction of the trolley 15 are formed in the flue 151, and the exhaust fan 152 can enable the sintering mixture in the trolley 15 to contain CO generated in the sintering process 2 Is led out into the flue 151 and ensures that combustion and sintering in the material layer structure can continue downwards.
Based on the above-mentioned material distributing device and/or sintering system, the embodiment of the invention further provides a sintering fuel segregation material distributing method (the embodiment of the invention is simply referred to as a method). The method is performed by a sintering fuel segregation distribution apparatus as described above, or by a sintering system as described above.
The sintering fuel segregation distribution method comprises the following steps: in the process that the raw material distributing mechanism fills the raw material mixed with the solid fuel into the trolley 15, the gas particles 9 are mixed into the raw material from bottom to top and from back to front by utilizing the respective distributing openings of the gas particle distributing mechanism, so as to construct the sintering mixture with the material layer structure in segregation distribution in the trolley 15. In other words, the method sequentially or synchronously distributes materials into the carriage 15 by the raw material distribution mechanism and the gas particle distribution mechanism, respectively, thereby constructing a sintered mixture having a material layer structure in which segregation is distributed in the carriage 15. The specific implementation process of the method is basically the same as the operation process of the material distribution device, and the same points are not repeated.
Therefore, the method can change the material layer structure of the sintering mixture by utilizing the segregation cloth, and can effectively replace part of solid fuel by utilizing the gas particles 9 while ensuring the material layer structure to have the high-efficiency and high-quality sintering effect by mixing the gas particles 9 into the raw materials mixed with the solid fuel so as to reduce the fuel quantity of the material layer structure formed in the sintering system, thereby effectively reducing the carbon emission of the sintering system and realizing energy conservation and emission reduction.
Furthermore, according to the sintering fuel segregation distribution method, the gas particles 9 are mixed into the raw materials according to segregation distribution by using the sintering fuel segregation distribution device in operation, when the outer wall of the gas particles 9 burns and breaks, the internal compression combustion of the material layer structure can slightly explode outwards, corresponding shock waves are generated for the material layer structure, the improvement of the internal air permeability of the material layer structure is facilitated, and therefore the sintering quality is improved.
Still further, in the method for distributing the sintered fuel segregation, according to the ignition direction of the fuel gas, the combustion zone 29 is known to be arranged on the cross-section structure of the material layer structure, the combustion zone 29 moves downwards from top to bottom along the vertical direction of the cross-section structure of the material layer structure, the ignition combustion position of the fuel gas is always kept below the combustion zone 29, the released heat and the released heat of the combustion of the solid fuel are directly used for heating the raw materials at the position of the combustion zone 29 so as to maintain the decomposition of the raw materials and the high temperature required by the formation of the liquid phase, a series of problems that in the sintering system in the prior art, the ignition position of the fuel gas is above the combustion zone 29, the released heat of the combustion needs to be heated for a second high temperature zone, the contribution to the improvement of the highest temperature in the lower front line of the combustion zone 29 and the inside of the combustion zone 29 in the sintering process is weak, the combustion position is uncontrollable, and the effect of the fuel gas replacing the solid fuel is finally weakened are avoided, so that the high-efficiency low-hydrogen low-carbon sintering can be finally realized.
In one embodiment, the method further comprises: as shown in fig. 6, the layer structure further includes: a second material layer structure formed during sintering. The cross-sectional structure of the second material layer structure comprises a raw material belt 26, an overwetting belt 27, a drying preheating belt 28, a burning belt 29 and a sintering ore belt 30 which are arranged in the trolley 15 from bottom to top, wherein the raw materials filled in the raw material belt 26, the overwetting belt 27 and the drying preheating belt 28 are mixed with gas particles 9.
During the sintering mixture passing through the ignition furnace 14, the ignition furnace 14 ignites the charge level of the sintering mixture, i.e., the cross-sectional structure of the material bed structure as shown in fig. 6, the combustion zone 29 moves downward from the top charge level, and after the charge level is sintered, a sinter zone 30 is formed above the combustion zone 29. A dry preheating zone 28, an over-wet zone 27 and a raw material zone 26 are formed in this order below the combustion zone 29. A plurality of gas particles 9 are respectively and uniformly distributed in the drying preheating zone 28, the overwetting zone 27 and the original material zone 26 according to a proportion. When the combustion zone 29 moves to the vicinity of the corresponding gas particles 9, the gas particles 9 are heated to a temperature above 1100 ℃, the capsule wall begins to melt and ignite, the compressed gas 91 pressurized in the capsule wall is released into the material layer, and the surrounding material layer and gas are heated to ignite and burn, thereby providing heat for the physical and chemical changes of sintering.
In one embodiment, as shown in fig. 7, the volume of gas particles 9 mixed in the feedstock gradually decreases from bottom to top. Namely, by changing the volume size of the gas particles 9 mixed into the raw material belt, the gas particles 9 of different sizes are mixed with the raw material by the above-mentioned distributing device and arranged in the carriage 15. Due to the difference in the size and mass of the gas particles 9 at different positions, the larger volume of gas particles 9 will fall to the bottom of the sinter mix, and the smaller volume of gas particles 9 will be at a position relatively upper, as shown in fig. 7. Because the combustion heat value of the solid fuel is far greater than that of the fuel gas in unit volume, the larger volume of the fuel gas particles 9 at the bottom occupies the space of the solid fuel, so that the solid fuel is less distributed at the bottom of the sintering mixture when the method is not adopted, and the distribution of the solid fuel is increased towards the upper layer. After the distribution, the fuel distribution (namely the total heat value of the fuel gas particles 9 and the solid fuel) of the cross section structure of the material layer structure is gradually increased from bottom to top along the vertical height direction, so that the segregation distribution of different fuels in the material layer structure along the vertical height direction is realized.
It will be appreciated that the present method may also achieve a segregation distribution of the fuel burn rate by controlling the gas pressure within the gas particles 9. For example, in the process of preparing the gas particles 9, the gas pressure inside the gas particles 9 is reasonably controlled, so that the pressure of the compressed gas 91 wrapped in the gas particles 9 with smaller volume is higher, and the pressure of the compressed gas 91 wrapped in the gas particles 9 with larger volume is lower, so that the amount of the gas wrapped in the gas particles 9 with larger volume is more. After the material layer structure shown in fig. 7 is obtained, since the smaller volume of the gas particles 9 containing more compressed gas 91 is closer to the upper portion of the material layer structure, the effect of the fuel segregation distribution in the height direction in the material layer structure can be more remarkable.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and it is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. The sintering fuel segregation distributing device is characterized by being connected between a mixing tank and a trolley positioned below the mixing tank; the sintered fuel segregation distributing device comprises:
the raw material distributing mechanism is connected between the mixing tank and the trolley and used for guiding raw materials mixed with solid fuel to form a raw material belt between the mixing tank and the trolley;
the gas particle distribution mechanism is connected above the trolley, and is provided with a plurality of distribution openings for throwing gas particles onto the trolley, and each distribution opening is sequentially arranged behind the raw material belt by taking the travelling direction of the trolley as the front; the gas particles comprise a capsule wall and compressed gas, an inner cavity is formed in the capsule wall in a sealing mode, and the capsule wall is made of combustible organic materials; the compressed fuel gas is filled in the inner cavity, and is hydrogen, natural gas or coke oven gas.
2. The sintered fuel segregation distribution device of claim 1, wherein the gas particulate distribution mechanism comprises:
the gas particle storage bin is internally stored with gas particles, and compressed gas is filled in the gas particles;
and one end of the material conveying channel is communicated with the gas particle storage bin, a plurality of material distributing openings are formed in the other end of the material conveying channel, and the material distributing openings are sequentially arranged above the trolley.
3. The apparatus according to claim 2, wherein the plurality of distribution openings includes a first distribution opening, a second distribution opening and a third distribution opening which are sequentially arranged from the back to the front behind the raw material belt, and apertures of the first distribution opening, the second distribution opening and the third distribution opening are L respectively 1 、L 2 And L 3 Has L 1 ＞L 2 ＞L 3 The method comprises the steps of carrying out a first treatment on the surface of the The number of the gas particles passing through the first distribution port, the second distribution port and the third distribution port is Q 1 、Q 2 And Q 3 With Q 1 ＞Q 2 ＞Q 3 。
4. The sintered fuel segregation distribution device of claim 3, wherein the feed channel is disposed horizontally above the trolley and a bottom plate of the feed channel is disposed at a predetermined angle to a horizontal plane, the predetermined angle ranging from 5 degrees to 15 degrees; the first material distribution port and the second material distribution port are respectively arranged at the bottom of the material conveying channel and respectively face the trolley, and the third material distribution port is arranged on the end face of the material conveying channel.
5. The sintered fuel segregation distribution device of any one of claims 1 to 4, wherein the raw material distribution mechanism includes:
the distributing device is arranged between the mixing tank and the trolley and can drive the raw materials to move forwards from the mixing tank through rotation;
the material guide plate is positioned in front of the distributing device so that the raw materials fall on the material guide plate, the material guide plate is obliquely arranged above the trolley, and the oblique direction of the material guide plate is opposite to the outflow direction of the raw materials;
the material leveling plate is obliquely arranged above the trolley and positioned in front of the material guiding plate, and one end of the material leveling plate is level with the upper surface of the trolley;
the distributor comprises a guide roller, wherein the axis of the guide roller is parallel to the width direction of the trolley, and the rotation direction of the guide roller is clockwise from front to back;
wherein, be equipped with on the blending tank towards the feed inlet of distributing device, install the gate on the feed inlet.
6. A sintered fuel segregation distribution method, characterized in that it is performed by the sintered fuel segregation distribution device according to any one of claims 1 to 5;
the sintering fuel segregation distribution method comprises the following steps:
in the process that the raw material distributing mechanism fills the raw material mixed with the solid fuel into the trolley, the gas particles are mixed into the raw material from bottom to top and back to front by utilizing each distributing opening of the gas particle distributing mechanism so as to construct the sintering mixture with a material layer structure in segregation distribution in the trolley.
7. The method of claim 6, wherein the material layer structure comprises a first material layer structure formed before sintering starts, the first material layer structure comprising a raw material mixed with solid fuel and a plurality of gas particles, the raw material being filled in the trolley, the gas particles being mixed in the raw material in a segregation distribution.
8. The method of claim 7, wherein the volume of each of the gas particles in the first bed structure gradually decreases from bottom to top.
9. The sintered fuel segregation distribution method of claim 6, further comprising:
the material layer structure further comprises a second material layer structure formed in the sintering process, wherein the cross-section structure formed by the second material layer structure comprises an original material belt, an overwetting belt, a drying preheating belt, a combustion belt and a sintering ore belt which are arranged in the trolley from bottom to top, and the gas particles are mixed in the raw materials filled in the original material belt, the overwetting belt and the drying preheating belt.
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