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CN-121977353-A - Sintering system and process for solid fuel treatment and grading and separate adding

CN121977353ACN 121977353 ACN121977353 ACN 121977353ACN-121977353-A

Abstract

The invention belongs to the field of metallurgical sintering, and particularly discloses a solid fuel treatment and grading and separate adding sintering system and process. According to the invention, the crushing and screening, air separation, fine particle granulation, batching, mixing and granulating, material distributing, sintering and sieving and granulating are sequentially carried out on the fuel, so that the fuel is systematically processed and classified, the ratio of each granularity of the fuel is optimized, the fuel with the granularity of 0-0.5mm and the fuel with the granularity of 0.5-3mm are respectively utilized, the utilization and production efficiency of the fuel are improved, the crushing effect of the fuel is improved, the water content of the fuel is optimized in the production process, and the problem of unsmooth transportation of the fuel in the pneumatic conveying process due to overhigh humidity is solved.

Inventors

  • CAO GUOXIANG
  • YU JUNJIE
  • ZHOU XIAOQING
  • WU QI
  • DAI YOUXUN
  • LI WENLIN
  • LI JIGAN
  • LI KANG
  • JING TAO
  • CHEN YU

Assignees

  • 中冶长天国际工程有限责任公司

Dates

Publication Date
20260505
Application Date
20260312

Claims (14)

  1. 1. A solid fuel processing and grading and adding sintering system is characterized by comprising The crushing and screening unit is used for crushing and screening out solid fuel with the particle size of 0-3 mm; The air separation unit is used for separating the solid fuel with the size of 0-3mm separated by the crushing and screening unit into solid fuel F3 with the size of 0-0.5mm and solid fuel with the size of 0.5-3mm, wherein the solid fuel with the size of 0.5-3mm comprises solid fuel F1 and solid fuel F2 with the size of 0.5-3 mm; the fine particle granulating unit is used for mixing and granulating the solid fuel F3 and the binder to obtain solid fuel F4 with the particle size of 0.5-3 mm; The batching unit is used for mixing the solid fuel F1 with quicklime, return ores, environmental dust removal and collection dust, flux and iron-containing uniformly mixed ores to obtain a sintered mixture M1; the mixing granulation unit is used for mixing the sintering mixture M1 with the solid fuel F4 to prepare a sintering mixture M2; the material distribution unit is used for sequentially distributing the base material, the sintering mixture M2 and the solid fuel F2 to the sintering unit; the sintering unit is used for sintering the materials distributed by the distribution unit; And the screening and granulating unit is used for screening the sintered ore with the particle size of 5-150mm in the sintered ore sintered and crushed by the sintering unit.
  2. 2. The solid fuel treatment and classification and addition sintering system according to claim 1, wherein the crushing and screening unit comprises a first fuel buffer bin (102), a first vibrating screen (107), a second fuel buffer bin (108), a first crusher (112), a second vibrating screen (113) and a bucket elevator (114) which are sequentially arranged along the fuel conveying direction, wherein fuel enters the first vibrating screen (107) from the first fuel buffer bin (102) to perform primary screening, screened upper fuel enters the second fuel buffer bin (108) and enters the first crusher (112) from the second fuel buffer bin (108) to crush, crushed fuel enters the second vibrating screen (113) to perform secondary screening, screened upper fuel enters the bucket elevator (114) from the second vibrating screen (114) and is conveyed back to the second fuel buffer bin (108), the pores of the first vibrating screen (107) and the second vibrating screen (113) are 3mm, and the screened upper fuel enters the second vibrating screen (113) from the second vibrating screen unit.
  3. 3. The solid fuel processing and classifying-adding sintering system according to claim 2, wherein the first crusher (112) is a six-roller crusher with adjustable roller gap, and the mass fraction of the fuel with the size of 0-3 mm in the crushed fuel of the first crusher (112) is more than 80%.
  4. 4. The solid fuel treatment and classification and addition sintering system according to claim 2 or 3, wherein the crushing and screening unit further comprises a first transfer belt conveyor (106) and an iron remover (105), the first transfer belt conveyor (106) is arranged between the first fuel buffer bin (102) and the first vibrating screen (107) and is used for transferring fuel discharged by the first fuel buffer bin (102) to the first vibrating screen (107), and the iron remover (105) is arranged above the first transfer belt conveyor (106).
  5. 5. The solid fuel treatment and classification sintering system according to any one of claims 2-4, wherein the air separation unit comprises a third fuel buffer bin (203), an air separation machine (206), a circular cooler (207) and a bag dust collector (214), the third fuel buffer bin (203) is used for accommodating undersize fuel of the first vibrating screen (107) and the second vibrating screen (113), the air separation machine (206) is used for separating the fuel discharged by the third fuel buffer bin (203) into solid fuel F3 with a particle size of 0-0.5mm, the solid fuel F1 and the solid fuel F2 with a particle size of 0.5-3mm enter the bag dust collector (214) along with air flow, an air inlet of the air separation machine (206) is communicated with a medium-low temperature exhaust gas outlet of the circular cooler (207), a first electric butterfly valve (208), a butterfly valve (209) and a heat regenerator ring (212) are sequentially arranged on the pipeline, and a heat regenerator ring (212) is further arranged between the air inlet of the electric butterfly valve and the air separation machine (209), and the air inlet of the normal temperature air regenerator ring (209) is further arranged at the normal temperature.
  6. 6. The solid fuel processing and classifying and feeding sintering system according to claim 5, wherein the air separation unit further comprises a third transfer tape machine (201), an online moisture detector (202) and a first air conveying pump (210), wherein the third transfer tape machine (201) is used for receiving undersize fuel of the first vibrating screen (107) and the second vibrating screen (113) and conveying the undersize fuel to the third fuel buffer bin (203), the online moisture detector (202) is arranged above the third transfer tape machine (201), and the first air conveying pump (210) is arranged at a dust outlet of the multi-pipe dust collector (209) and is used for conveying dust discharged by the multi-pipe dust collector (209) to the batching unit.
  7. 7. The solid fuel processing and classifying and adding sintering system according to claim 6, wherein the fine particle granulating unit comprises a second pneumatic conveying bin pump (301), a fourth fuel buffering bin (302), a binder buffering bin (305) and a pelletizing granulator (311), the second pneumatic conveying bin pump (301) is used for conveying solid fuel F3 collected by the bag-type dust collector (214) to the fourth fuel buffering bin (302), a first quantitative feeder (308) is arranged at a discharge hole of the fourth fuel buffering bin (302), the binder buffering bin (305) is used for containing a binder, a second quantitative feeder (309) is arranged at a discharge hole of the binder buffering bin (305), and the pelletizing granulator (311) is used for receiving the solid fuel F3 in the fourth fuel buffering bin (302) and the binder in the binder buffering bin (305) and granulating the solid fuel F4 into solid fuel of 0.5-3mm particle size.
  8. 8. The solid fuel processing and classifying-adding sintering system according to claim 7, wherein the proportioning unit comprises a proportioning fuel bin (402), a proportioning quicklime bin (403), a proportioning return mine bin (404), a proportioning dust bin (405), a proportioning flux bin (406) and a proportioning mixing mine bin (407), the proportioning fuel bin (402) is used for accommodating solid fuel F1 and solid fuel F2 separated by the winnowing machine (206), a third dosing machine (414) is arranged at a discharge port of the proportioning fuel bin (402), a fourth dosing machine (415) is arranged at a discharge port of the proportioning quicklime bin (403), a fifth dosing machine (416) is arranged at a discharge port of the proportioning return mine bin (404), a feed port of the proportioning flux bin (405) is communicated with the first air conveying pump (210), a sixth dosing machine (417) is arranged at a discharge port of the proportioning flux bin (406), a seventh dosing machine (418) is arranged at a discharge port of the proportioning flux bin (419) is arranged at a discharge port of the proportioning flux mixing machine (407).
  9. 9. The solid fuel processing and staged addition sintering system of claim 8, wherein the mixing and pelletization unit comprises a primary mixer (501) and a secondary granulator (503), wherein the primary mixer (501) is used for receiving and mixing solid fuel F1, quicklime, return ore, environmental dust, flux and iron uniformly mixed ore to form a sinter mixture M1, and the secondary granulator (503) is used for receiving the sinter mixture M1 in the primary mixer (501) and solid fuel F4 in the pelletization granulator (311) and pelletizing to form a sinter mixture M2.
  10. 10. The solid fuel processing and classifying-feeding sintering system according to claim 9, wherein the distributing unit comprises a third pneumatic conveying bin pump (601), a fifth fuel buffer bin (602), a ninth dosing machine (605) and a fuel distributor (606), a mixture distributor (607) and a base material distributor (608), the third pneumatic conveying bin pump (601) is used for conveying solid fuel F2 to the fifth fuel buffer bin (602), the ninth dosing machine (605) is arranged at a discharge port of the fifth fuel buffer bin (602) and used for conveying solid fuel F2 to the fuel distributor (606), the fuel distributor (606) is used for distributing solid fuel F2 to the sintering unit, the mixture distributor (607) is used for distributing sintered mixture M2 to the sintering unit, the base material distributor (608) is used for distributing base material to the sintering unit, and the mixture distributor (607) and the fuel distributor (606) are arranged in sequence along a material conveying direction of the sintering unit.
  11. 11. The solid fuel treatment and classification and addition sintering system according to claim 10, wherein the sintering unit comprises a sintering machine (701), an electric dust collector (703) and an exhaust fan (704), the sintering machine (701) is used for sintering materials conveyed by the distribution unit, and the electric dust collector (703) and the exhaust fan (704) are sequentially arranged at the downstream of the sintering machine (701) along the flowing direction of sintering waste gas.
  12. 12. A solid fuel treatment and classification adding sintering process is characterized by being applied to the solid fuel treatment and classification adding sintering system according to any one of claims 1-11, and comprises the following steps: s1, crushing and screening the fuel, namely, screening the solid fuel with the grain size of more than 3mm through pre-screening and crushing, checking and screening to obtain the solid fuel with the grain size of 0-3 mm; S2, winnowing, namely separating the solid fuel with the particle size of 0-3mm screened in the step S1 into solid fuel F3 with the particle size of 0-0.5mm and solid fuel with the particle size of 0.5-3mm, and separating the solid fuel with the particle size of 0.5-3mm into two parts of solid fuel F1 and solid fuel F2; S3, batching, namely mixing the solid fuel F1 separated in the step S2 with quicklime, return ores, dust collected by environmental dust removal, flux and iron-containing uniformly mixed ores to obtain a sintered mixture M1; S4, granulating the fine particles, namely mixing and granulating the solid fuel F3 separated in the step S2 with a binder to obtain solid fuel F4 with the particle size of 0.5-3 mm; s5, mixing and granulating, namely mixing and granulating the sintering mixture M1 obtained in the step S3 and the solid fuel F4 obtained in the step S4 to obtain a sintering mixture M2; s6, fuel distribution and sintering, namely sequentially distributing the backing material, the sintering mixture M2 obtained in the step S5 and the solid fuel F2 separated in the step S2 on a sintering machine trolley, and performing ignition, air draft and sintering; s7, screening and finishing, namely crushing and cooling the sintered ore obtained in the step S6, and screening the crushed and cooled sintered ore to obtain the sintered ore with the grain size of 5-150 mm.
  13. 13. The solid fuel treatment and staged addition sintering process of claim 12, wherein the solid fuel F1 comprises 70% -90% of the fuel blended by the sintering system, the solid fuel F2 comprises 5% -10% of the fuel blended by the sintering system, and the solid fuel F3 comprises 5% -20% of the fuel blended by the sintering system.
  14. 14. The solid fuel processing and staged addition sintering process according to claim 12 or 13, further comprising the step of: s201, detecting whether the moisture of the solid fuel on the third transfer tape machine (201) is less than or equal to 8% by using the online moisture detector (202); s202, if yes, the system controls the first electric butterfly valve (208) to be closed, and controls the second electric butterfly valve (211) to be opened; And S203, if not, the system controls the first electric butterfly valve (208) to be opened and controls the second electric butterfly valve (211) to be closed.

Description

Sintering system and process for solid fuel treatment and grading and separate adding Technical Field The invention relates to the technical field of metallurgical sintering, in particular to a sintering system and a sintering process for solid fuel treatment and grading and separate addition. Background The solid fuel is one of the main fuels adopted in the metallurgical sintering process and is also a main source of carbon emission in the ferrous metallurgy industry. Too fine or too coarse solid fuel particle size can have great influence on the sintering process, too fine solid fuel particle size can lead to too high sintering combustion speed, damage to the structure and the air permeability of a sintering material layer and increase of the difficulty of process control, and too coarse solid fuel particle size can lead to reduction of combustion efficiency, uneven fuel distribution and poor air permeability of the material layer. Therefore, the fuel particle size (usually 0-3mm, with 0.5-3mm being the most desirable range) should be strictly controlled in practical production, avoiding too coarse or too small particle size to ensure sinter quality and production efficiency. The problems in the prior art mainly include (1) the problems that in the process of crushing the fuel, the crushing effect is poor, such as an open-type double-roll and four-roll crushing mode in the conventional sintering method, the problems that the particle size ratio of the fuel with the particle size of 0.5-3mm cannot be checked, the situation that the particle size ratio of the fuel with the particle size of less than 0.5mm or more than 3mm is overlarge is unfavorable for the sintering process, the problems that the fine particle fuel with the particle size of less than 0.5mm cannot be effectively utilized after the treatment and classification of the sintering fuel in the prior art, such as the patent with the application number of CN202510217252.8 discloses a sintered fuel particle size sorting system and a method, and the patent with the application number of CN202510076684.1 discloses a sintered wet light fine fuel sorting system, the further direction and the treatment of the fine particle fuel with the particle size of less than 0.5mm are not referred to only in the conventional sintering fuel treatment and classification, and (3) the problems that the transportation is not carried in the pneumatic transportation process of the fuel due to the high water content of the fuel in the prior art, and the patent with the patent number of CN218619152U has the problem that the moisture content of the fuel is not optimized in the pneumatic transportation process, but the moisture content of the special device is not suitable for the smooth transportation of the fuel. Therefore, the present invention provides a solid fuel processing and staged addition sintering system and process for solving the above problems. Disclosure of Invention The invention mainly aims to provide a solid fuel treatment and grading addition sintering system and process, which are used for systematically treating and grading addition of sintered solid fuel, optimizing the ratio of each granularity of the fuel, respectively utilizing the fuels with different granularities, and improving the utilization and production efficiency of the fuel. In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: a solid fuel handling and staged addition sintering system comprising: And the crushing and screening unit is used for crushing and screening out solid fuel with the particle size of 0-3 mm. The air separation unit is used for separating the solid fuel with the size of 0-3mm separated by the crushing and screening unit into solid fuel F3 with the size of 0-0.5mm and solid fuel with the size of 0.5-3mm, wherein the solid fuel with the size of 0.5-3mm comprises solid fuel F1 and solid fuel F2 with the size of 0.5-3 mm. And the fine particle granulating unit is used for mixing and granulating the solid fuel F3 and the binder to obtain the solid fuel F4 with the particle size of 0.5-3 mm. The batching unit is used for mixing the solid fuel F1 with quicklime, return ores, environmental dust removal and collection dust, flux and iron-containing uniformly mixed ores to obtain a sintered mixture M1. And the mixing granulation unit is used for mixing the sintering mixture M1 with the solid fuel F4 to prepare the sintering mixture M2. And the distributing unit is used for sequentially distributing the base material, the sintering mixture M2 and the solid fuel F2 to the sintering unit. And the sintering unit is used for sintering the materials distributed by the distribution unit. And the screening and granulating unit is used for screening the sintered ore with the particle size of 5-150mm in the sintered ore sintered and crushed by the sintering unit. According to the invention, the solid fuel with the particle size of 0-3mm is