CN113215392B - Method for preparing fuel by sintering material and fuel preparation device - Google Patents
Method for preparing fuel by sintering material and fuel preparation device Download PDFInfo
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- CN113215392B CN113215392B CN202110462745.XA CN202110462745A CN113215392B CN 113215392 B CN113215392 B CN 113215392B CN 202110462745 A CN202110462745 A CN 202110462745A CN 113215392 B CN113215392 B CN 113215392B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
A method for preparing fuel by sintering materials, which comprises the following steps: a. screening: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin; b. primary ditching: ditching the iron-containing material of the sintering material conveying belt for the first time, and adding quicklime into the primary ditch; c. secondary ditching: secondary ditching is carried out on quick lime, and small-particle fuel is added into the secondary ditch; d. adding water; adding water to the quicklime; e. folding: folding the charge level; f. and (3) granulating: the sintered material after being mixed enters a granulator for granulation, and the invention has the following beneficial effects: 1. the defects of blocking gaps, reducing the productivity and the like caused by sintering small-particle fuel are eliminated; 2. the small particle fuel is prevented from being sucked away by the exhaust fan, so that the utilization rate of the fuel is improved; 3. the accuracy of the proportion of the fuel in the ingredients is ensured; 4. the loss of heat generated during the slaking of the quicklime is reduced.
Description
Technical Field
The invention relates to a carbon blending method and a fuel blending device for improving the utilization rate of small-particle-grade fuel, belonging to the technical field of ferrous metallurgy.
Background
Iron ore powder in the metallurgical industry is sintered, iron-containing ore powder in a certain particle size range is matched with fuel and flux which are crushed into small particles according to a preset alkalinity and the condition of energy consumption of the materials in a certain proportion, and then water is added for uniformly mixing and granulating to form a sintering ingredient. The sintering ingredients are uniformly distributed on a sintering device according to a certain thickness, and by means of ignition and air draft of a fan, a part of low-melting-point substances are generated by means of high temperature generated by fuel combustion and a series of physical and chemical changes among materials, and are softened and melted to generate a certain amount of liquid phase, iron minerals are wetted and bonded together, and after cooling, the porous blocky sintering ore with certain strength is formed. In the iron ore powder sintering process, fuel is one of indispensable materials, the commonly selected fuel is coke powder and coal powder, the combustion process of the fuel depends on the granularity of the coke powder or the coal powder, if the fuel granularity is too coarse, the specific surface area is too small, the combination condition of the fuel and oxygen is poor, the combustion speed is slow, the thickness of a combustion zone is widened, the air permeability of a sintering layer is poor, and further the vertical sintering speed is slowed down, so that the productivity is reduced; in addition, the excessive fuel granularity can cause the relative sparse and uneven distribution of fuel in the material bed, aggravate the temperature difference between the upper part and the lower part of the sintering ore bed, the inconsistent quality of the sintering ore, low yield and the like. When the particle size of the fuel is too fine, the specific surface area is increased, the fuel is easily dispersed in each part of a material layer, the combustion speed is high, and the heat conductivity of a sintering material is poor, the combustion speed of the solid fuel cannot reach the time for keeping high temperature and high temperature required by the melting of the material layer, the high-temperature reaction cannot be carried out in time, so that the sintering temperature is reduced, the generation amount of a liquid phase is insufficient, the binder phase of the sintering ore is reduced, the drum strength is reduced, the powder is more, the ore return amount is increased, the production rate is reduced, meanwhile, the fine particle fuel easily blocks the gaps of the material layer, the movement of air flow is blocked, the air permeability of the material layer is poor, the pressure difference is increased, the combustion zone is thickened, and the yield of the sintering ore is reduced; and the fuel is very easy to be pumped away by the air exhaust system after being too thin, the fuel utilization rate is reduced, and the fuel consumption is increased. In view of this, the fuel particle size is regulated to be less than 3mm and controlled to be 75-85% in the normal production process, but a large amount of parts less than 0.5mm, generally about 15%, appear in the fuel particle size composition, and the fuel is directly added into the powder, and the particle size is just a part with a fine particle size, which causes the carbon utilization rate to be reduced in the sintering process, the fuel consumption to be increased, the gap is blocked, the productivity is reduced, and even the fuel is extracted by the air extraction system, resulting in the waste of the fuel.
Disclosure of Invention
Aiming at overcoming the defects of the prior art, the invention provides a sintering material fuel blending method and a fuel blending device aiming at improving the utilization rate of small-particle fuel.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing fuel by sintering, the preparation process is carried out according to the following processes:
a. screening: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin;
b. primary ditching: ditching on an iron-containing material of a sintered material conveying belt for the first time, and adding quick lime into the primary ditch;
c. secondary ditching: secondary ditching is carried out on quick lime, and small-particle fuel is added into the secondary ditch;
d. adding water; adding water to the quicklime;
e. folding: folding the charge level;
f. granulating: and (4) feeding the sintered material subjected to burdening into a granulator for granulation.
According to the method for preparing the fuel by the sintering material, in the primary ditching step, the primary ditching depth is 7-10cm, and the ditching width is 10-15cm; adding quicklime into the primary ditch; and (3) ditching for the second time on quick lime, wherein the ditching depth is 5-8cm, and the ditching width is 8-10cm.
According to the method for preparing the fuel by the sintering material, the water adding temperature in the water adding step is not lower than 60 ℃.
The utility model provides a device of sintered charge fuel of joining in marriage, includes sintered charge conveyor belt, is equipped with fuel feed bin, iron powder feed bin, quick lime feed bin, tiny particle bunker on sintered charge conveyor belt upper portion, is equipped with first furrow opener between iron powder feed bin and quick lime feed bin, is equipped with the second furrow opener between quick lime feed bin and tiny particle bunker in proper order, sets gradually hot water shower nozzle and folds the ware behind tiny particle bunker.
According to the device for blending fuel in sintering materials, the first furrow opener and the second furrow opener are identical in structure, the first furrow opener comprises a furrow opener body and a connecting frame, the front portion of the furrow opener body is a triangular rigid section, the rear portion of the furrow opener body is a trapezoidal rigid section, a flexible section is arranged at the joint of the front portion and the rear portion, the furrow opener body is composed of an inner layer consisting of a belt, thin steel plate layers are arranged outside the belts of the triangular rigid section and the trapezoidal rigid section, and the thin steel plate layers are fixedly connected with the belt through screws; the connecting frame comprises a connecting pipe, a reinforcing end, a longitudinal beam and a reinforcing rib, the connecting pipe is vertically arranged, a fastening screw is arranged on the connecting pipe, the two ends of the longitudinal beam are fixedly connected with the reinforcing end and the lower part of the connecting pipe respectively, the reinforcing end is fixedly connected with the triangular rigid section in a matching mode, the upper part of the connecting pipe is fixedly connected with one end of the reinforcing rib, and the other end of the reinforcing rib is fixedly connected with the reinforcing end.
In the device for blending fuel in sintering material, the first furrow opener is also provided with an adjusting mechanism, the adjusting mechanism comprises pin shafts, springs and adjusting screws which are symmetrically arranged, one ends of the two springs are respectively and fixedly connected with the two sides of the longitudinal beam, the other ends of the two springs are respectively and fixedly connected with the two side plates of the trapezoidal rigid section, each pin shaft respectively penetrates through the trapezoidal rigid section and the spring, and the outer side end of each pin shaft is fixedly connected with the trapezoidal rigid section; one end of each screw rod is fixedly connected with the lower part of the connecting pipe, the other end of each screw rod penetrates through the trapezoidal rigid section, and a nut is screwed on the screw rod.
According to the device for blending the fuel by the sintering material, the approximator is composed of an approximator body and an approximator connecting frame, the approximator body is a regular triangular frame body, and an approximator body straight side plate is provided with an approximator opening; the approximator connecting frame is provided with an approximator connecting pipe, a fastening screw is arranged on the approximator connecting pipe, the front side of the approximator connecting pipe is fixedly connected with a straight edge of the approximator body through two connecting rods, and the rear side of the approximator connecting pipe is fixedly connected with two inclined edge plates of the approximator body through a T-shaped connecting rod.
According to the device for blending the fuel by the sintering material, the bottom edges of the two inclined edge plates of the approximator body are inclined upwards.
According to the device for blending the fuel by the sintering material, the upper part of the sintering material conveying belt is provided with the fixing rod for connecting the first furrow opener, the second furrow opener and the approximator.
The invention aims at solving the problem of utilization of small-particle fuel in the sintering process, and improves the method, wherein small particles with the particle size of less than 0.5mm in the fuel are screened out, the screened small-particle fuel is distributed in a quicklime ditch in the burdening process through ditching operation, hot water is added to digest the quicklime, the quicklime is promoted to form colloid in the digestion process, and meanwhile, the small-particle fuel is adhered to the surface of the quicklime and is fixed, and then the ditch is closed. The method has the following beneficial effects: 1. the defects of reduced carbon utilization rate, increased fuel consumption, clearance blockage, reduced productivity and the like caused by small-particle fuel in the sintering process are overcome; 2. the small particle fuel is prevented from being sucked away by the exhaust fan, so that the utilization rate of the fuel is improved; 3. the accuracy of the proportion of the fuel in the ingredients is ensured; 4. the ditching operation can reduce the thermal loss that produces when quick lime slaking, improves the mixture temperature, can also carry out preliminary nucleation, fixed pellet fuel in the colloid of flux quick lime with certain material sneaking into simultaneously. By adopting the method, the sintering index of the obtained sintering ore is superior to that of the sintering ore produced by the actual sintering machine under the condition of sintering control with the same operation parameters, and the utilization rate of fuel is improved.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view of a first furrow opener configuration;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic structural view of the approximator;
FIG. 5 is a left side view of FIG. 4;
fig. 6 is a top view of fig. 4.
The list of labels in the figure is: 1. the device comprises a fuel bin, 2, an iron powder bin, 3, a quicklime bin, 4, a small particle fuel bin, 5, a hot water spray head, 6, a sintering material conveying belt, 7, a first furrow opener, 7-1, a connecting pipe, 7-2, a fastening screw, 7-3, a reinforcing rib, 7-4, a longitudinal beam, 7-5, a reinforcing end, 7-6, a triangular rigid section, 7-7, a flexible section, 7-8, a trapezoidal rigid section, 7-9, a thin steel plate layer, 7-10, a belt layer, 7-11, a pin shaft, 7-12, a spring, 7-13, a screw rod, 8, a second furrow opener, 9, a folding device, 9-1, a folding device connecting pipe, 9-2, a T-shaped connecting rod, 9-3, a folding device body inclined side plate, 9-4, a folding device body straight side plate, 9-5, a connecting rod, 9-6, a folding opening, 10 and a fixing rod.
Detailed Description
The method is designed aiming at solving the problem of utilization of small-particle fuel in the sintering process, and comprises the steps of screening fuel (coke powder and coal powder) to be blended, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin. In the process of conveying the sintering material conveying belt, a groove with a certain depth is formed in the iron-containing powder on the sintering material conveying belt, quicklime is distributed in the groove, then secondary ditching is carried out on the quicklime, small-particle fuel with the size of less than 0.5mm after screening is distributed in the quicklime groove, the quicklime is sprayed by hot water to fully digest the quicklime, digestion of the quicklime is improved, and the material surface is folded. The hot water is to heat the surface water and the steam to raise the water temperature to 60-70 ℃ so as to achieve the effect of strengthening the quicklime digestion. After the slaked water temperature is increased, the slaked speed of the quicklime is increased, and the colloid can be quickly formed, small granular fuel can be adhered to enter the granulator and then can be quickly adhered to adjacent materials to form a mother nucleus, or the small granular fuel is adhered to the surface of the granular material to form the mother nucleus by taking the granular material as a core, the mother nucleus can continuously grow up along with the rotation of the granulator to form a mixture consisting of certain granularity, the small granular fuel is effectively fixed, and a foundation is laid for improving the carbon blending utilization rate. In addition, the material is under the action of adsorbed water (water molecules adsorbed on the surface of solid particles under the action of electrostatic force), film water (molecular layers which are not attracted by the unbalanced molecular force after forming the adsorbed water and are divided into strong bound water and weak bound water), capillary water (when the material is wetted to exceed the film water, water begins to fill in gaps among material particles), and gravity water (free water which can move under the action of gravity and pressure difference), so that the mineral powder material around the water drops is pulled to the centers of the water drops to form small balls. Wherein, the film water can improve the green ball strength and plasticity, and the capillary water plays a leading role to promote the particle nucleation. The whole pelletizing is carried out by depending on the mechanical force and the surface tension of water, and the viscosity and the surface tension are in an inverse relation relative to the surface tension, so that the higher the viscosity is, the lower the surface tension is, while the lower the viscosity of hot water is relative to cold water, the surface tension is increased, and the pelletizing action of the mixture is promoted. By adopting the method, the granulation behavior of the mixture is promoted, the utilization rate of the fuel is improved, the small-particle fuel is prevented from being drawn away by the exhaust fan, and the adverse effects of the small-particle fuel on the combustion consumption increase, the gap blockage, the productivity reduction and the like generated in the sintering process are eliminated. The addition amount of the small particle fuel is not more than 15% of the total amount of the fuel.
Referring to fig. 1, in order to realize the method, the invention designs a sintering material fuel proportioning device, which comprises a sintering material conveying belt 6, wherein a fuel bin 1, an iron powder bin 2, a quicklime bin 3 and a small-particle fuel bin 4 are arranged at the upper part of the sintering material conveying belt. A first opener 7 for opening a ditch for the iron-containing material powder is arranged between the iron powder bin and the quicklime bin, a second opener 8 for opening a ditch for the quicklime material surface is arranged between the quicklime bin and the small-particle fuel bin, and a hot water spray nozzle 5 and a folding device 9 for introducing hot water are sequentially arranged behind the small-particle fuel bin.
Referring to fig. 1 to 3, the first furrow opener and the second furrow opener are identical in structure, and the structure of the first furrow opener is specifically described below by taking the first furrow opener as an example. The first furrow opener comprises a furrow opener body and a connecting frame, wherein the furrow opener body is of a three-section type, the front part is a triangular rigid section 7-6, the rear part is a trapezoidal rigid section 7-8, and a flexible section 7-7 is arranged at the joint of the front part and the rear part. The inner layer of the furrow opener body is composed of belts 7-10, thin steel plate layers 7-9 are arranged outside the belts of the triangular rigid section and the trapezoidal rigid section to improve rigidity and wear resistance, and the thin steel plate layers are fixedly connected with the belts through screws. The connecting frame is used for installing a furrow opener, three fixing rods 10 are fixed on the upper portion of the sintering material conveying belt, and the first furrow opener, the second furrow opener and the folding device are respectively connected to the fixing rods. The connecting frame comprises a connecting pipe 7-1, a reinforcing end 7-5, a longitudinal beam 7-4 and a reinforcing rib 7-3. The connecting pipe is vertically arranged, the connecting pipe is connected with the fixed rod through a fastening screw 7-2, and the height of the furrow opener can be adjusted by loosening the fastening screw so as to meet the depth requirement of furrow opening. Two ends of the longitudinal beam are fixedly connected with a reinforcing end head and the lower part of the connecting pipe respectively, and the reinforcing end head of the triangle is fixedly connected with the rigid section of the triangle in a matching manner so as to improve the rigidity of the rigid section of the triangle. The upper part of the connecting pipe is fixedly connected with one end of a reinforcing rib, and the other end of the reinforcing rib is fixedly connected with a reinforcing end socket. In order to be suitable for different ditching widths, the first ditcher is also provided with an adjusting mechanism, and the adjusting mechanism is used for adjusting the width of the large-end opening of the trapezoidal rigid section, so that the requirement on the ditching width is met. The adjusting mechanism comprises two pin shafts 7-11, two springs 7-12 and two adjusting screws 7-13 which are symmetrically arranged. One end of each of the two springs is fixedly connected to two sides of the longitudinal beam, and the other end of each of the two springs is fixedly connected to two side plates of the trapezoidal rigid section. Each pin shaft respectively penetrates through the trapezoidal rigid section and the spring, and the outer side end of each pin shaft is fixedly connected with the trapezoidal rigid section. One end of each screw rod is fixedly connected with the lower part of the connecting pipe, the other end of each screw rod penetrates through the trapezoidal rigid section, and a nut is screwed on each screw rod. The width of the large end opening of the trapezoidal rigid section can be adjusted by rotating the nut.
Referring to fig. 1 and 4-6, the approximator 9 is used for approximating the opened charge level. The approximator is composed of an approximator body and an approximator connecting frame, the approximator body is a regular triangle frame body, an approximator body straight side plate 9-4 is provided with an approximator opening 9-6, and an opening of the approximator opening is from large to small. The approximator connecting frame is provided with an approximator connecting pipe 9-1 which is provided with a fastening screw. The front side (the big end side) of the approximator connecting pipe is fixedly connected with the straight edge of the approximator body through two connecting rods 9-5, and the rear side of the approximator connecting pipe is fixedly connected with two inclined edge plates 9-3 of the approximator body through a T-shaped connecting rod 9-2. The bottom edges of the two inclined edge plates of the approximator body are inclined upwards from front to back.
Two specific examples of the process of the invention are provided below:
example 1: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin; ditching for one time on the iron-containing materials distributed on the sintered material conveying belt, wherein the ditching depth is 8cm, and the ditching width is 12cm; adding quicklime into the primary ditch; ditching on quick lime for the second time, wherein the ditching depth is 6cm, and the ditching width is 10cm; adding small-particle fuel into the secondary channel, and spraying hot water at 65 ℃ on the quick lime; folding the charge level; and (4) feeding the sintered material subjected to burdening into a granulator for granulation. The sintering parameters were controlled as follows: 13.4 negative pressure (-kPa), 1150 ignition temperature (DEG C), 0.03044 vertical sintering speed (m/min), 1.607 horizontal sintering speed (m/min), 4.1 screened carbon (%) in the sintering mixture, 0.5mm (%) and 0.2 small particle fuel, 76.35 sintered ore drum index (%), 3.15 (%) and 79.35 RDI +, 10 percent (DEG C) drippage by loading reduction and soft melting, 1150 and 40 percent (DEG C) drippage by loading reduction and soft melting, 1253.
Example 2: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin; ditching for one time on the iron-containing materials distributed on the sintered material conveying belt, wherein the ditching depth is 9cm, and the ditching width is 14cm; adding quicklime into the primary ditch; ditching for the second time on quick lime, wherein the ditching depth is 8cm, and the ditching width is 10cm; adding small-particle fuel into the secondary ditch, and spraying hot water with the temperature of 63 ℃ on quick lime; folding the charge level; and feeding the sintered materials subjected to batching into a granulator for granulation. The sintering parameters were controlled as follows: 13.4 negative pressure (-kPa), 1150 ignition temperature (DEG C), 0.03044 vertical sintering speed (m/min), 1.607 horizontal sintering speed (m/min), 4.0 carbon (%) after screening, less than 0.5mm (%) 0.3 small particle fuel, 77.15 sintered ore rotary drum index (%) after detection and RDI +3.15 (%) 80.45, 10% (° c) 1155 of load reduction reflow dropping, and 1263 of load reduction reflow dropping 40% (° c).
Example 3: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin; ditching for one time on the iron-containing materials distributed on the sintered material conveying belt, wherein the ditching depth is 10cm, and the ditching width is 15cm; adding quicklime into the primary ditch; ditching is carried out on quick lime for the second time, wherein the ditching depth is 8cm, and the ditching width is 9cm; adding small-particle fuel into the secondary channel, and spraying hot water at 60 ℃ on the quick lime; folding the charge level; complete the processAnd (4) granulating the blended sintering material in a granulator. The sintering parameters were controlled as follows: 13.4 negative pressure (-kPa), 1150 ignition temperature (DEG C), 0.03044 vertical sintering speed (m/min), 1.607 horizontal sintering speed (m/min), 3.9 carbon after screening of the sintering mixture, less than 0.5mm (%) 0.4 small particle fuel, 77.69 sintered ore Rotary Drum Index (RDI) through detection +3.15 (%) 80.95, load reduced reflow dropping 10% (° c) 1164, load reduced reflow dropping 40% (° c) 1283.
Sample test data from the inventive method is compared to the operating data of the prior art method as shown in the following table.
As can be seen from the above table: according to the invention, the part of the fuel which is less than 0.5mm after being screened is added into the mixture along with the flux, and after hot water is added, quicklime can quickly form colloid, small-particle fuel can be adhered, the small-particle fuel is effectively fixed, the uniform distribution of the fuel in the mixture is realized, the segregation of the fuel is reduced, and the three-phase reaction is more sufficient and stable in the sintering process, so that under the condition of controlling the same operation parameters in sintering, the drum strength is averagely improved by 0.91%, the sintered ore metallurgical property RDI +3.15% index is averagely improved by 1.17%, the initial temperature of load softening is averagely improved by 8 ℃, the stable and smooth operation of a blast furnace is realized, the support is provided for enhancing the air permeability, and the improvement of the fuel utilization rate of the sintering process is realized.
Claims (6)
1. A method of sintering a batch fuel, characterized by: the burdening process is carried out according to the following processes:
a. screening: sieving the fuel to be blended by a square-hole sieve of 0.5mm, putting oversize materials into a fuel bin, and putting undersize materials into a small-particle fuel bin;
b. primary ditching: ditching on an iron-containing material of a sintered material conveying belt for the first time, and adding quick lime into the primary ditch;
c. secondary ditching: secondary ditching is carried out on quick lime, and small-particle fuel is added into the secondary ditch;
d. adding water; adding water to the quicklime;
e. folding: folding the charge level;
f. granulating: feeding the sintered material subjected to batching into a granulator for granulation;
in the primary ditching step, the primary ditching depth is 7-10cm, and the ditching width is 10-15cm; adding quicklime into the primary ditch; ditching on quick lime for the second time, wherein the ditching depth is 5-8cm, and the ditching width is 8-10cm;
the water adding temperature in the water adding step is not lower than 60 ℃;
after the temperature of the slaking water is increased, the slaking speed of the quicklime is increased, and the quicklime can quickly form colloid, so that small granular fuel can be adhered, and after entering the granulator, the adjacent materials can be quickly adhered to form a mother core or be adhered to the surface of a granular material.
2. An apparatus for use in a method of sintering a batch as claimed in claim 1, wherein: the device comprises a sintering material conveying belt, wherein a fuel bin, an iron powder bin, a quicklime bin and a small-particle fuel bin are arranged at the upper part of the sintering material conveying belt, a first furrow opener is arranged between the iron powder bin and the quicklime bin, a second furrow opener is sequentially arranged between the quicklime bin and the small-particle fuel bin, and a hot water spray nozzle and a folding device are sequentially arranged behind the small-particle fuel bin;
the structure of the first furrow opener is the same as that of the second furrow opener, the first furrow opener comprises a furrow opener body and a connecting frame, the front part of the furrow opener body is a triangular rigid section, the rear part of the furrow opener body is a trapezoidal rigid section, a flexible section is arranged at the joint of the front part and the rear part, the furrow opener body consists of a belt as an inner layer, thin steel plate layers are arranged outside the belts of the triangular rigid section and the trapezoidal rigid section, and the thin steel plate layers are fixedly connected with the belts through screws; the connecting frame comprises a connecting pipe, a reinforcing end, a longitudinal beam and a reinforcing rib, the connecting pipe is vertically arranged, a fastening screw is arranged on the connecting pipe, the two ends of the longitudinal beam are fixedly connected with the reinforcing end and the lower part of the connecting pipe respectively, the reinforcing end is fixedly connected with the triangular rigid section in a matching mode, the upper part of the connecting pipe is fixedly connected with one end of the reinforcing rib, and the other end of the reinforcing rib is fixedly connected with the reinforcing end.
3. The apparatus for use in a method of sintering a batch fuel according to claim 2, wherein: the first furrow opener is also provided with an adjusting mechanism, the adjusting mechanism comprises pin shafts, springs and adjusting screws which are symmetrically arranged, one ends of the two springs are fixedly connected to the two sides of the longitudinal beam respectively, the other ends of the two springs are fixedly connected to the two side plates of the trapezoidal rigid section respectively, each pin shaft penetrates through the trapezoidal rigid section and the spring respectively, and the outer side end of each pin shaft is fixedly connected to the trapezoidal rigid section; one end of each screw rod is fixedly connected with the lower part of the connecting pipe, the other end of each screw rod penetrates through the trapezoidal rigid section, and a nut is screwed on each screw rod.
4. The apparatus for use in a method of sintering a batch fuel according to claim 2, wherein: the approximator is composed of an approximator body and an approximator connecting frame, the approximator body is a regular triangular frame body, and a straight side plate of the approximator body is provided with an approximator opening; the approximator connecting frame is provided with an approximator connecting pipe, a fastening screw is arranged on the approximator connecting pipe, the front side of the approximator connecting pipe is fixedly connected with a straight edge of the approximator body through two connecting rods, and the rear side of the approximator connecting pipe is fixedly connected with two inclined edge plates of the approximator body through a T-shaped connecting rod.
5. The apparatus for use in a method of sintering a batch fuel according to claim 2, wherein: the bottom edges of the two inclined edge plates of the approximator body are inclined upwards.
6. The apparatus for use in a method of sintering a batch fuel according to claim 2, wherein: the upper part of the sintering material conveying belt is provided with a fixed rod for connecting the first furrow opener, the second furrow opener and the approximator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110462745.XA CN113215392B (en) | 2021-04-28 | 2021-04-28 | Method for preparing fuel by sintering material and fuel preparation device |
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