CN216688206U - Quick reduction system of rotary kiln - Google Patents
Quick reduction system of rotary kiln Download PDFInfo
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- CN216688206U CN216688206U CN202220251972.8U CN202220251972U CN216688206U CN 216688206 U CN216688206 U CN 216688206U CN 202220251972 U CN202220251972 U CN 202220251972U CN 216688206 U CN216688206 U CN 216688206U
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Abstract
The utility model discloses a rotary kiln rapid reduction system, which adopts a rotary kiln body, a rotary kiln body blowing device and a control device, wherein the control device comprises a controller, the controller is used for controlling the actions of a multi-tube dust remover and a first high-temperature resistant exhaust fan, extracting reduction gas escaping from the slow cooling section close to the upper part of a material layer of a reduction roasting section, properly cooling the reduction gas by the multi-tube dust remover, and then sending the reduction gas into a low-temperature part of a preheating section close to a drying section by the first high-temperature resistant exhaust fan through the lower part of the material layer; and the second high-temperature resistant exhaust fan is also used for controlling the action of the second high-temperature resistant exhaust fan to remove the water vapor and CO at the tail of the drying section kiln2And a small amount of CO tail gas is pumped into the high-temperature part of the reduction roasting section. The utility model has high automation degree and good temperature control effect; reduce and returnThe reaction temperature required by the original reaction is increased, the temperature of the preheating section is increased, the deep proceeding of the reduction reaction of the preheating section is promoted, and the purposes of saving energy, reducing emission and improving the production efficiency are achieved.
Description
Technical Field
The utility model relates to the technical field of iron-containing solid waste treatment, and particularly discloses a rotary kiln rapid reduction system.
Background
A large amount of dust of iron-making furnace slag, gas mud and gas ash is generated in the production process of the iron and steel integrated enterprise; converter dust, steel slag and iron scale generated in the converter steelmaking process; and steel rolling oil sludge and iron oxide scales generated in the steel rolling process. Most of the materials have certain use value, and if the materials are not used, a large amount of pollution discharge cost is needed, and mineral resources are wasted.
The prior process for treating the iron-containing solid waste mainly adopts a coal-based rotary kiln method, which is the most important, most valuable and widely applied process in the coal-based method. The method can produce sponge iron and granular iron by reducing the iron ore according to different operation temperatures, but the method has the most significance for producing the sponge iron by using a rotary kiln operated at low temperature. The rotary kiln has the advantages that solid coal can be directly used as energy, and effective desulfurization can be realized.
The traditional reduction kiln is limited by small productivity and easy ring formation, and has the following problems from the aspect of a thermal system:
1) and because the feeding amount of the kiln tail coal is small, and the spraying distance of the kiln head coal can not cover the middle-rear part area of the rotary kiln, the pellets at the middle-rear part can not be covered by the reduced coal, so that the fluctuation of the metallization rate of the pellets discharged from the kiln is large, the number of unqualified pellets is large, and the production is unstable.
2) When the supply amount of kiln tail coal is increased in order to cover pellets at the middle rear part of the rotary kiln in operation, the temperature of a cold smoke chamber is rapidly increased to 1100-1200 ℃ due to the increase of the volatile component overflow amount of the kiln tail coal, dust in a reburning chamber is seriously softened and melted, the dust is bonded to form a 'ring formation', and when the 'ring formation' locally falls off and falls into a water seal tank, the phenomenon of 'water explosion' is seriously caused, so that potential safety hazards are brought.
3) The structural form of the secondary air nozzles of the kiln body determines that combustion-supporting air can only be introduced by about 10 secondary air nozzles, the temperature field fluctuation along the direction of the kiln body is large, and the rotary kiln is easy to form rings.
4) The structural form of the secondary air nozzle also determines that the secondary air and combustible components in the kiln are basically in a parallel flowing state, the mixing is not good, and the volatile components of the kiln tail coal cannot be completely combusted at the middle rear part of the kiln, so that the volatile components enter the smoke cooling chamber and are combusted, which is another important reason for overhigh temperature of the smoke cooling chamber.
Therefore, the above-mentioned defects existing in the existing treatment process of the solid waste containing iron are a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model provides a quick reduction system of a rotary kiln, aiming at solving the defects in the existing treatment process of iron-containing solid waste.
The utility model relates to a rotary kiln rapid reduction system, which comprises a rotary kiln body, a kiln head fuel supply device, a kiln tail raw fuel supply device, a rotary kiln body blowing device, a rotary kiln heat supply device, a rotary kiln tail gas treatment device and a control device, wherein the rotary kiln body comprises a kiln head, a kiln body and a kiln tail, the kiln head fuel supply device and the rotary kiln heat supply device are respectively communicated with the kiln head of the rotary kiln body, the kiln tail raw fuel supply device and the rotary kiln tail gas treatment device are respectively communicated with the kiln tail of the rotary kiln body, the rotary kiln body blowing device is communicated with the kiln body of the rotary kiln body, the kiln body of the rotary kiln body is sequentially divided into a drying section, a preheating section, a reduction roasting section and a slow cooling section from the tail to the head, the control device comprises a controller, a first air duct, a second air duct, a multi-tube dust remover, a first high-temperature resistant exhaust fan and a second high-temperature resistant exhaust fan, one end of the first air pipe is communicated with the bottom of the drying section, and the other end of the first air pipe is communicated with the bottom of the reduction roasting section; one end of the second air pipe is communicated with the top of the joint of the slow cooling section and the reduction roasting section, and the other end of the second air pipe is communicated with the bottom of the preheating section; the second high-temperature resistant exhaust fan is arranged on the first air pipe, and the multi-pipe dust remover and the first high-temperature resistant exhaust fan are sequentially arranged on the second air pipe; the controller is respectively and electrically connected with the multi-tube dust remover, the first high-temperature-resistant exhaust fan and the second high-temperature-resistant exhaust fan and is used for controlling the multi-tube dust remover and the first high-temperature-resistant exhaust fan to act, extracting the reducing gas escaping from the upper part of a material layer of the slow cooling section, which is close to the reduction roasting section, and after the reducing gas is properly cooled by the multi-tube dust remover, sending the reducing gas into a low-temperature part of the preheating section, which is close to the drying section, through the lower part of the material layer by the first high-temperature-resistant exhaust fan; and the second high-temperature resistant exhaust fan is also used for controlling the action of the second high-temperature resistant exhaust fan to remove the water vapor and CO at the tail of the drying section kiln2And a small amount of CO tail gas is pumped into the high-temperature part of the reduction roasting section.
Further, the kiln head fuel supply device and the rotary kiln body air blowing device are respectively communicated with the slow cooling section, the reduction roasting section and the preheating section through a dynamic and static combined air sleeve and are used for respectively blowing the pulverized coal supplied by the kiln head fuel supply device to the slow cooling section, the reduction roasting section and the preheating section through the rotary kiln body air blowing device; the dynamic and static combination air sleeve comprises a movable sleeve and a fixed sleeve, the movable sleeve is sleeved on the fixed sleeve, and the movable sleeve is fixedly connected to the kiln body of the rotary kiln body and used for rotating together with the rotary kiln body; the fixed sleeve is provided with an air inlet duct communicated with a blast device of the rotary kiln body.
Furthermore, a plurality of air ring tracks and a plurality of kiln body rotating devices which respectively rotate around the air ring tracks are arranged on the kiln body of the rotary kiln body, the air ring tracks are uniformly arranged along the axial direction of the outer wall of the kiln body of the rotary kiln body at intervals, the kiln body rotating devices are respectively communicated with a rotary kiln body air blowing device and the rotary kiln body and used for supplying air through the rotary kiln body air blowing device when the rotary kiln body rotates, each kiln body rotating device comprises a rotary kiln cylinder, a rotary ring outer cylinder, a kiln body air duct assembly, a baffle valve, a pull skewer, a rotary sliding assembly and a sliding bearing assembly, the kiln body air duct assembly is communicated with the rotary kiln cylinder, one end of the pull skewer is movably connected with the rotary ring outer cylinder through the rotary sliding assembly, and the other end of the pull skewer is connected with the baffle valve after penetrating through an air cavity of the kiln body air duct assembly; the sliding bearing group is connected with the outer wall of the outer cylinder of the rotating ring.
Further, a plurality of kiln body wind channel subassembly circumference is evenly spaced and is arranged around the rotary kiln barrel, and a plurality of rotary sliding subassembly circumference is evenly spaced and is arranged around rotatory ring urceolus, and a plurality of draws the skewer and correspond respectively and connect between kiln body wind channel subassembly and rotary sliding subassembly.
Furthermore, the kiln body air duct assembly comprises a cavity, a first air inlet air duct flange plate and a second air inlet air duct flange plate which are arranged on two sides of the cavity, a sealing cover arranged at the top end of the cavity and a secondary air nozzle arranged at the bottom end of the cavity; the rotary sliding assembly comprises a moving frame, a first roller, a second roller and a third roller, wherein the first roller, the second roller and the third roller are arranged on the moving frame; one end of the pull rod extends into the cavity and penetrates through the secondary air nozzle to be fixedly connected with the stop valve, and the other end of the pull rod is in threaded connection with the movable frame and is used for pulling the stop valve to act so as to open or close the secondary air nozzle; the sliding bearing group comprises a fixed frame, a fourth roller and a fifth roller, wherein the fourth roller and the fifth roller are vertically arranged on the fixed frame, the fixed frame is fixedly connected with the outer wall, and the fourth roller and the fifth roller are respectively in sliding connection with the wind ring rail.
Further, the kiln head fuel supply device comprises a kiln head cover and an air coal burner which is arranged in the kiln head cover and used for spraying pulverized coal; the heat supply device of the rotary kiln comprises a reburning chamber and a blower which is connected with the reburning chamber and is used for supplying air to the reburning chamber, and a conveying device for adding reducing materials and lump coal is arranged on the raw fuel supply device at the tail of the kiln; the rotary kiln tail gas treatment device comprises tail gas pumping equipment which is arranged above a kiln hood and used for pumping the tail gas of the rotary kiln.
The beneficial effects obtained by the utility model are as follows:
the utility model provides a rotary kiln rapid reduction system, which adopts a rotary kiln body, a kiln head fuel supply device, a kiln tail raw fuel supply device, a rotary kiln body blast device, a rotary kiln heat supply device, a rotary kiln tail gas treatment device and a control device, wherein the control device comprises a controller, a first air pipe, a second air pipe, a multi-pipe dust remover, a first high-temperature-resistant exhaust fan and a second high-temperature-resistant exhaust fan, and is used for controlling the actions of the multi-pipe dust remover and the first high-temperature-resistant exhaust fan, extracting reducing gas escaping from the slow cooling section close to the upper part of a material layer of a reduction roasting section, properly cooling the reducing gas by the multi-pipe dust remover, and sending the reducing gas into a low-temperature part of a preheating section close to a drying section by the first high-temperature-resistant exhaust fan through the lower part of the material layer; and the second high-temperature resistant exhaust fan is also used for controlling the action of the second high-temperature resistant exhaust fan to remove the water vapor and CO at the tail of the drying section kiln2And a small amount of CO tail gas is pumped into the high-temperature part of the reduction roasting section. The rotary kiln rapid reduction system provided by the utility model has the advantages of high automation degree and good temperature control effect; the main reaction rate of each section in the kiln is improved; drying, preheating, reducing roasting and slow cooling stages of water vapor, CO and CO in a coal-based rotary kiln2And the residual heat is reasonably redistributed, the utilization potential of preheating and residual energy is fully exerted, the reaction temperature required by the reduction reaction is reduced, the temperature of the preheating section is increased, the deep proceeding of the reduction reaction of the preheating section is promoted, and the purposes of saving energy, reducing emission and improving the production efficiency are achieved.
Drawings
FIG. 1 is a schematic diagram of the operation principle of a control device in a rapid reduction system of a rotary kiln according to the present invention;
FIG. 2 is a schematic structural diagram of a first embodiment of a rapid reduction system of a rotary kiln according to the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the rapid reduction system of a rotary kiln according to the present invention;
FIG. 4 is a schematic structural view of an embodiment of a dynamic and static combined wind jacket in the rapid reduction system of a rotary kiln provided by the present invention;
FIG. 5 is a schematic view of a rotary device and an air ring track in the rotary kiln rapid reduction system according to the present invention;
FIG. 6 is a schematic view of a rotary device and an air ring track in a rotary kiln rapid reduction system according to the present invention;
FIG. 7 is a schematic perspective view of a rotary device and an air ring track in cooperation with each other in the rapid reduction system of a rotary kiln according to the present invention;
FIG. 8 is a schematic side view of a rotary device and an air ring track in a rotary kiln rapid reduction system according to the present invention;
fig. 9 is a schematic cross-sectional view taken along plane C-C of fig. 8.
The reference numbers illustrate:
10. a rotary kiln body; 20. a kiln head fuel supply device; 30. a kiln tail raw fuel supply device; 40. a blower device; 50. a heating device of the rotary kiln; 60. a rotary kiln tail gas treatment device; 11. a drying section; 12. a preheating section; 13. a reduction roasting section; 14. a slow cooling section; 71. a first air duct; 72. a second air duct; 73. a multi-tube dust collector; 74. a first high temperature resistant exhaust fan; 75. A second high temperature resistant exhaust fan; 80. a dynamic and static combined wind sleeve; 81. a movable sleeve; 82. fixing a sleeve; 821. an air inlet duct; 15. a rotating device; 16. a wind ring track; 151. a rotary kiln cylinder; 152. rotating the outer cylinder; 153. a kiln body air duct assembly; 154. a stop valve; 155. pulling the skewer; 156. A rotating slide assembly; 157. a sliding bearing set; 1531. a cavity; 1532. a first air inlet duct flange plate; 1533. a second air inlet duct flange plate; 1534. a sealing cover; 1535. a secondary air nozzle; 1561. a movable frame; 1562. a first roller; 1563. a second roller; 1564. a third roller; 1521. a ring body; 1522. a groove; 1523. an outer wall; 1524. an inner wall; 1571. a fixed mount; 1572. a fourth roller; 1573. a fifth roller; 21. a kiln head cover; 22. a wind coal burner; 51. a reburning chamber; 52. a blower; 31. a conveying device; 61. and tail gas pumping equipment.
Detailed Description
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
As shown in FIG. 1 and FIG. 2, a first embodiment of the present invention provides a rapid reduction system for a rotary kiln, comprising a rotary kiln body 10, a kiln head fuel supply device 20, a kiln tail raw fuel supply device 30, a rotary kiln body blowing device 40, a rotary kiln heat supply device 50, a rotary kiln tail gas treatment device 60 and a control device, wherein the rotary kiln body 10 comprises a kiln head, a kiln body and a kiln tail, the kiln head fuel supply device 20 and the rotary kiln heat supply device 50 are respectively connected with the kiln head of the rotary kiln body 10, the kiln tail raw fuel supply device 30 and the rotary kiln tail gas treatment device 60 are respectively connected with the kiln tail of the rotary kiln body 10, the rotary kiln body blowing device 40 is connected with the kiln body of the rotary kiln body 10, the kiln body of the rotary kiln body 10 is sequentially divided into a drying section 11, a preheating section 12, a reduction roasting section 13 and a slow cooling section 14 from the tail to the head, the control device comprises a controller, a drying section 11, a preheating section 12, a reduction roasting section 13 and a slow cooling section 14, A first air pipe 71, a second air pipe 72, a multi-pipe dust collector 73, a first high-temperature-resistant exhaust fan 74 and a second high-temperature-resistant exhaust fan 75, wherein one end of the first air pipe 71 is communicated with the bottom of the drying section 11, and the other end of the first air pipe 71 is communicated with the bottom of the reduction roasting section 13; one end of the second air pipe 72 is communicated with the top of the joint of the slow cooling section 14 and the reduction roasting section 13, and the second air isThe other end of the tube 72 is connected to the bottom of the preheating section 12; the second high temperature resistant exhaust fan 75 is arranged on the first air pipe 71, and the multi-pipe dust collector 73 and the first high temperature resistant exhaust fan 74 are sequentially arranged on the second air pipe 72; the controller is respectively electrically connected with the multi-tube dust remover 73, the first high-temperature resistant exhaust fan 74 and the second high-temperature resistant exhaust fan 75 and is used for controlling the multi-tube dust remover 73 and the first high-temperature resistant exhaust fan 74 to act, extracting the reducing gas escaping from the upper part of the material layer of the slow cooling section 14 close to the reducing roasting section 13, properly cooling the reducing gas by the multi-tube dust remover 73, and then sending the reducing gas into the low-temperature part of the preheating section 12 close to the drying section 11 by the first high-temperature resistant exhaust fan 74 through the lower part of the material layer; and is also used for controlling the action of a second high-temperature resistant exhaust fan 75 to remove water vapor and CO at the tail of the kiln of the drying section 112And a small amount of CO tail gas is pumped into the high-temperature part of the reduction roasting section 13. In this embodiment, the kiln head fuel supply device 20 includes a kiln head cover 21 and an air-coal burner 22 arranged in the kiln head cover 21 for spraying pulverized coal; the rotary kiln heat supply device 50 comprises a reburning chamber 51 and a blower 52 which is connected with the reburning chamber 51 and used for supplying air to the reburning chamber 51, and a conveying device 31 for adding reduced materials and lump coal is arranged on the kiln tail raw fuel supply device 30; the rotary kiln tail gas treatment device 60 comprises a tail gas pumping device 61 which is arranged above the kiln head cover 21 and used for pumping the rotary kiln tail gas. The temperature requirement of the drying section 11 is less than 500 ℃. The temperature requirement of the preheating section 12 is less than 900 ℃. The temperature requirement of the reduction roasting section 13 is less than 1200 ℃. The temperature requirement of the slow cooling section 14 is less than 700 ℃.
The working principle of the rotary kiln rapid reduction system provided by the embodiment is as follows:
the drying section 11 of the rotary kiln mainly realizes the dehydration process of the raw materials, the temperature is about 300 ℃, and the main components in the airflow at the tail part (close to the waist tail section) of the drying section 11 are water vapor and CO2And a small amount of CO, etc. in the conventional condition, the tail gas is discharged out of the rotary kiln and then is subjected to reburning and dust removal treatment, and the CO is discharged out of the rotary kiln2The main outlet for discharge. The positions of the reduction roasting section 13 and the slow cooling section 14 of the rotary kiln are the highest temperature positions generated by a flame spray gun at the kiln head, and a large amount of high-temperature burning coal is contained in the materials at the positions, the temperature of the coal exceeds 1200 ℃, and the coal is an overheated part of the materials. For realizing the temperature in the whole rotary kilnThe temperature of the position is higher than the temperature required by reduction, namely the heat is excessive, the material, coal ash and the like are easy to melt under the high-temperature condition, and the position is also the main position of the ring formation of the rotary kiln, so that the temperature of the material at the position is reduced, and the inherent key effect of the rotary kiln is relieved. In this example, the tail of the drying section is treated with water vapor and CO at about 300 deg.C2And a small amount of CO tail gas is pumped into the highest temperature part of the reduction roasting section 13, and the tail gas is pumped from the lower parts of the material and the high-temperature combustion coal, so that two main functions can be realized, one is to properly reduce the temperature of an overheating part, and can effectively prevent ring formation; the second is water vapor and CO2Reacting with unreacted carbon at high temperature to obtain water gas and Boolean reaction to obtain H2And CO:
water gas reaction: h2O+C＝H2+CO
A Boolean reaction: CO 22+C＝2CO
The water gas reaction and the Boolean reaction are endothermic reactions, can also reduce the temperature of overheated materials and can also generate reducing gas H2And CO, the reducing atmosphere in the materials is improved, and the reduction reaction is promoted.
The temperature of the preheating section 12 in the rotary kiln is mainly below 900 ℃, the reaction of CO reducing materials mainly occurs in coal-based reduction, and the reduction reaction occurs slowly in the preheating section 12. How to increase the reduction reaction rate of the preheating section is the key to realize low-temperature rapid reduction. And H2In contrast, the reducibility of CO is weaker than that of H below 830 DEG C2Thus, H can be introduced into the preheating section2And raising the temperature of the preheating section to enable the preheating section to generate H2The reduction reaction with the materials achieves the purpose of improving the reduction reaction rate of the preheating section. In this embodiment, the reducing gas (mainly comprising H) escaping from the slow cooling section 14 near the upper part of the material layer of the reduction roasting section 132And CO), is pumped out, is properly cooled by a plurality of pipes, and is sent to the low-temperature part of the preheating section close to the drying section by a first high-temperature resistant exhaust fan 74 through the lower part of the material layer. The scheme can achieve two purposes, one purpose is that high-temperature gas passes through a low-temperature material layer at a preheating section to improve the temperature of the material layer; the second is H in high-temperature gas2And COAfter entering the material bed, the reduction reaction at the preheating section can be effectively promoted, and the aim of low-temperature rapid reduction is fulfilled.
The rotary kiln rapid reduction system provided by the embodiment has the following beneficial effects:
1. by using water vapor and CO in tail gas of rotary kiln2Realization of CO2And (4) emission reduction.
2. Properly reduce the temperature of the overheated part of the reduction roasting section and prevent the material from forming rings.
3. Increase H in the material layer at the reduction roasting stage2And the concentration of CO promotes the rapid reduction of the materials in the reduction roasting section, and improves the temperature and H of the materials in the preheating section2And the concentration of CO accelerates the reduction reaction in the preheating section, and the low-temperature rapid reduction is realized under the synergistic effect of the CO and the reduction reaction in the preheating section.
4. Effectively utilizes the residual heat and residual energy in the tail gas and the residual heat and residual energy of the gas in the slow cooling section.
In the above structure, please refer to fig. 3 and fig. 4, in the rotary kiln rapid reduction system provided in this embodiment, the kiln head fuel supply device 20 and the rotary kiln body air blowing device 40 are respectively communicated with the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 through the dynamic and static combined air jacket 80, and are used for respectively blowing the pulverized coal supplied by the kiln head fuel supply device 20 to the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 through the rotary kiln body air blowing device 40; the dynamic and static combination wind sleeve 80 comprises a movable sleeve 81 and a fixed sleeve 82, the movable sleeve 81 is sleeved on the fixed sleeve 82, and the movable sleeve 81 is fixedly connected to the kiln body of the rotary kiln body 10 and used for rotating together with the rotary kiln body 10; the fixed sleeve 82 is provided with an air inlet duct 821 communicated with an air outlet of the rotary kiln body air blowing device 40. In this embodiment, the pulverized coal supplied by the kiln head fuel supply device 20 is directly fed into the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 through the rotary kiln body air blowing device 40 by the dynamic and static combined air jacket 80, so as to rapidly heat up the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 and improve the heat transfer efficiency; the low-temperature rapid reduction of the coal-based rotary kiln can be realized, and the purposes of saving energy, reducing emission and improving production efficiency are achieved.
Preferably, referring to fig. 5 to 9, in the rapid reduction system of the rotary kiln provided in this embodiment, a plurality of wind ring rails 16 and a plurality of kiln body rotating devices 15 respectively corresponding to the wind ring rails 16 are disposed on the kiln body of the rotary kiln body 10, the plurality of wind ring rails 16 are uniformly spaced along the axial direction of the outer wall of the kiln body of the rotary kiln body 10, the kiln body rotating devices 15 are respectively communicated with the rotary kiln body blowing device 40 and the rotary kiln body 10 for blowing air through the rotary kiln body blowing device 40 when the rotary kiln body 10 rotates, the kiln body rotating devices 15 include a rotary kiln cylinder 151, a rotary ring outer cylinder 152, a kiln body wind channel assembly 153, a check valve 154, a pull rod 155, a rotary sliding assembly 156 and a sliding bearing set 157, the kiln body wind channel assembly 153 is communicated with the rotary kiln cylinder 151, one end of the pull rod 155 is movably connected with the rotary ring outer cylinder 152 through the rotary sliding assembly 156, the other end of the pull rod 155 passes through the air cavity of the kiln body air duct assembly 153 and is connected with the stop valve 154; the slide bearing set 157 is attached to the outer wall 1523 of the rotating ring outer cylinder 152. Specifically, a plurality of kiln body air duct assemblies 153 are circumferentially and uniformly spaced around the rotary kiln cylinder 151, a plurality of rotary sliding assemblies 156 are circumferentially and uniformly spaced around the rotary outer cylinder 152, and a plurality of pull rods 155 are respectively and correspondingly connected between the kiln body air duct assemblies 153 and the rotary sliding assemblies 156. Further, the kiln body air duct assembly 153 includes a cavity 1531, a first air inlet duct flange 1532 and a second air inlet duct flange 1533 disposed at two sides of the cavity 1531, a sealing cover 1534 disposed at the top end of the cavity 1531, and a secondary air nozzle 1535 disposed at the bottom end of the cavity 1531; the rotary sliding assembly 156 comprises a moving frame 1561, and a first roller 1562, a second roller 1563 and a third roller 1564 which are arranged on the moving frame 1561, wherein the first roller 1562 is transversely arranged on the moving frame 1561, the second roller 1563 and the third roller 1564 are positioned at two sides of the first roller 1562 and are radially arranged on the moving frame 1561, the rotary ring outer cylinder 152 comprises a ring body 1521, a groove 1522 arranged in the middle of the ring body 1521, and an outer wall 1523 and an inner wall 1524 arranged at two ends of the ring body 1521, the first roller 1562 is in rolling connection with the groove 1522, the second roller 1563 is in rolling connection with the outer wall 1523, and the third roller 1564 is in rolling connection with the inner wall 1524; one end of the pull rod 155 extends into the cavity 1531 and passes through the secondary tuyere 1535 to be fixedly connected with the damper 154, and the other end of the pull rod 155 is in threaded connection with the movable rack 1561 for pulling the damper 154 to open or close the secondary tuyere 1535; the sliding bearing set 157 includes a fixed frame 1571, and a fourth roller 1572 and a fifth roller 1573 vertically disposed on the fixed frame 1571, the fixed frame 1571 is fixedly connected to the outer wall 1523, and the fourth roller 1572 and the fifth roller 1573 are respectively slidably connected to the wind ring rail 16. In this embodiment, the air ring rail 16 is oval, so that the baffle valve 154 can block or open the outlet in real time, open at the wide aperture and close at the narrow aperture, thereby achieving the purpose of controlling the hot air intake and pulverized coal blowing. The pulverized coal supplied by the kiln head fuel supply device 20 is directly sent to the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 through the blast device 40 of the kiln body of the rotary kiln through the mutual matching of the plurality of air ring rails 16 and the plurality of kiln body rotating devices 15, the slow cooling section 14, the reduction roasting section 13 and the preheating section 12 are rapidly heated, and the heat transfer efficiency is improved; the low-temperature rapid reduction of the coal-based rotary kiln can be realized, and the purposes of saving energy, reducing emission and improving production efficiency are achieved.
Compared with the prior art, the rotary kiln rapid reduction system provided by the embodiment adopts a rotary kiln body, a kiln head fuel supply device, a kiln tail raw fuel supply device, a rotary kiln body blowing device, a rotary kiln heat supply device, a rotary kiln tail gas treatment device and a control device, wherein the control device comprises a controller, a first air pipe, a second air pipe, a multi-pipe dust remover, a first high-temperature-resistant exhaust fan and a second high-temperature-resistant exhaust fan, and is used for controlling the action of the multi-pipe dust remover and the first high-temperature-resistant exhaust fan, so that the reduction gas escaping from the slow cooling section close to the upper part of a material layer of a reduction roasting section is extracted, and is properly cooled by the multi-pipe dust remover and then is sent to the low-temperature part of the preheating section close to the drying section by the first high-temperature-resistant exhaust fan through the lower part of the material layer; and the second high-temperature resistant exhaust fan is also used for controlling the action of the second high-temperature resistant exhaust fan to remove the water vapor and CO at the tail of the drying section kiln2And a small amount of CO tail gas is pumped into the high-temperature part of the reduction roasting section. The rotary kiln rapid reduction system provided by the embodiment has high automation degree and good temperature control effect; the main reaction rate of each section in the kiln is improved; drying, preheating, reducing roasting and slow cooling stages of water vapor, CO and CO in a coal-based rotary kiln2And the reasonable redistribution of the waste heat, the utilization potential of preheating and waste energy is fully exerted, the reaction temperature required by the reduction reaction is reduced, and the reaction temperature is improvedThe temperature of the preheating section promotes the deep proceeding of the reduction reaction of the preheating section, thereby achieving the purposes of saving energy, reducing emission and improving production efficiency.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A rotary kiln rapid reduction system is characterized by comprising a rotary kiln body (10), a kiln head fuel supply device (20), a rotary kiln body air blowing device (40) and a control device, the rotary kiln body (10) comprises a kiln head, a kiln body and a kiln tail, the rotary kiln body blower device (40) is communicated with the kiln body of the rotary kiln body (10), the kiln body of the rotary kiln body (10) is divided into a drying section (11), a preheating section (12), a reduction roasting section (13) and a slow cooling section (14) from the tail to the head in sequence, the control device comprises a controller, a first air pipe (71), a second air pipe (72), a multi-pipe deduster (73), a first high-temperature resistant exhaust fan (74) and a second high-temperature resistant exhaust fan (75), one end of the first air pipe (71) is communicated with the bottom of the drying section (11), the other end of the first air pipe (71) is communicated with the bottom of the reduction roasting section (13); one end of the second air pipe (72) is communicated with the top of the joint of the slow cooling section (14) and the reduction roasting section (13), and the other end of the second air pipe (72) is communicated with the bottom of the preheating section (12); the second high-temperature resistant exhaust fan (75) is arranged on the first air pipe (71), and the multi-pipe deduster (73) and the first high-temperature resistant exhaust fan (74) are sequentially arranged on the second air pipe (72); the controller is respectively electrically connected with the multi-tube dust collector (73), the first high-temperature-resistant exhaust fan (74) and the second high-temperature-resistant exhaust fan (75).
2. The rotary kiln rapid reduction system according to claim 1, wherein the kiln head fuel supply device (20) and the rotary kiln body blowing device (40) are respectively communicated with the slow cooling section (14), the reduction roasting section (13) and the preheating section (12) through a dynamic and static combined wind sleeve (80), and are used for blowing the pulverized coal supplied by the kiln head fuel supply device (20) to the slow cooling section (14), the reduction roasting section (13) and the preheating section (12) through the rotary kiln body blowing device (40).
3. The rotary kiln rapid reduction system according to claim 2, wherein the dynamic and static combined windband (80) comprises a movable sleeve (81) and a fixed sleeve (82), the movable sleeve (81) is sleeved on the fixed sleeve (82), and the movable sleeve (81) is fixedly connected to the body of the rotary kiln body (10) and is used for rotating together with the rotary kiln body (10); and an air inlet duct (821) communicated with an air outlet of the rotary kiln body air blowing device (40) is arranged on the fixed sleeve (82).
4. The rotary kiln rapid reduction system according to claim 3, wherein a plurality of air ring rails (16) and a plurality of kiln body rotating devices (15) which respectively rotate around the air ring rails (16) are arranged on the kiln body of the rotary kiln body (10), the plurality of air ring rails (16) are axially and uniformly arranged at intervals along the outer wall of the kiln body of the rotary kiln body (10), the kiln body rotating devices (15) are respectively communicated with the rotary kiln body air blowing device (40) and the rotary kiln body (10) and are used for blowing air through the rotary kiln body air blowing device (40) when the rotary kiln body (10) rotates, the kiln body rotating devices (15) comprise a rotary kiln cylinder body (151), a rotary ring outer cylinder (152), a rotary kiln body air duct assembly (153), a stop valve (154), a pull rod (155), a rotary sliding assembly (156) and a sliding bearing group (157), the kiln body air duct assembly (153) is communicated with the rotary kiln cylinder (151), one end of the pull rod (155) is movably connected with the rotary ring outer cylinder (152) through the rotary sliding assembly (156), and the other end of the pull rod (155) penetrates through an air cavity of the kiln body air duct assembly (153) and then is connected with the stop valve (154); the sliding bearing set (157) is connected with the outer wall (1523) of the rotating ring outer cylinder (152).
5. The rotary kiln rapid reduction system according to claim 4, characterized in that a plurality of the kiln body air duct assemblies (153) are circumferentially and uniformly spaced around the rotary kiln cylinder (151), a plurality of the rotary slip assemblies (156) are circumferentially and uniformly spaced around the rotary ring outer cylinder (152), and a plurality of the pull rods (155) are respectively and correspondingly connected between the kiln body air duct assemblies (153) and the rotary slip assemblies (156).
6. The rotary kiln rapid reduction system as claimed in claim 5, wherein the kiln body air duct assembly (153) comprises a cavity (1531), a first air inlet duct flange (1532) and a second air inlet duct flange (1533) disposed at both sides of the cavity (1531), a sealing cover (1534) disposed at the top end of the cavity (1531), and a secondary air nozzle (1535) disposed at the bottom end of the cavity (1531); the rotary sliding assembly (156) comprises a moving frame (1561), and a first roller (1562), a second roller (1563) and a third roller (1564) which are arranged on the moving frame (1561), the first roller 1562 is transversely disposed on the moving frame 1561, the second roller 1563 and the third roller 1564 are positioned at both sides of the first roller 1562 and radially disposed on the moving frame 1561, the rotating ring outer cylinder (152) comprises a ring body (1521), a groove (1522) arranged in the middle of the ring body (1521), an outer wall (1523) and an inner wall (1524) arranged at two ends of the ring body (1521), the first roller (1562) is in rolling connection with the groove (1522), the second roller (1563) is in rolling connection with the outer wall (1523), and the third roller (1564) is in rolling connection with the inner wall (1524); one end of the pull rod (155) extends into the cavity (1531) and penetrates through the secondary air nozzle (1535) to be fixedly connected with the stop valve (154), and the other end of the pull rod (155) is in threaded connection with the movable rack (1561) and is used for pulling the stop valve (154) to open or close the secondary air nozzle (1535); the sliding bearing set (157) comprises a fixed frame (1571) and a fourth roller (1572) and a fifth roller (1573) which are vertically arranged on the fixed frame (1571), the fixed frame (1571) is fixedly connected with the outer wall (1523), and the fourth roller (1572) and the fifth roller (1573) are respectively in sliding connection with the wind ring rail (16).
7. The rotary kiln rapid reduction system according to claim 1, wherein the rotary kiln low-temperature rapid reduction drying system further comprises a kiln tail raw fuel supply device (30), a rotary kiln heat supply device (50) and a rotary kiln tail gas treatment device (60), the kiln head fuel supply device (20) and the rotary kiln heat supply device (50) are respectively communicated with a kiln head of the rotary kiln body (10), and the kiln tail raw fuel supply device (30) and the rotary kiln tail gas treatment device (60) are respectively communicated with a kiln tail of the rotary kiln body (10).
8. The rotary kiln rapid reduction system as claimed in claim 7, wherein the kiln head fuel supply device (20) comprises a kiln head cover (21) and an air-coal burner (22) arranged in the kiln head cover (21) and used for spraying pulverized coal; the rotary kiln heat supply device (50) comprises a reburning chamber (51) and a blower (52) which is connected with the reburning chamber (51) and used for supplying air to the reburning chamber (51), and a conveying device (31) used for adding a reducing material and lump coal is arranged on the kiln tail raw fuel supply device (30); the rotary kiln tail gas treatment device (60) comprises tail gas pumping equipment (61) which is arranged above the kiln head cover (21) and used for pumping the rotary kiln tail gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220251972.8U CN216688206U (en) | 2022-02-07 | 2022-02-07 | Quick reduction system of rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220251972.8U CN216688206U (en) | 2022-02-07 | 2022-02-07 | Quick reduction system of rotary kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216688206U true CN216688206U (en) | 2022-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220251972.8U Active CN216688206U (en) | 2022-02-07 | 2022-02-07 | Quick reduction system of rotary kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216688206U (en) |
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2022
- 2022-02-07 CN CN202220251972.8U patent/CN216688206U/en active Active
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Address after: Room 2201, Building 5, Hetang Yuese Community, No. 46, Hongqi South Road, Hetang District, Zhuzhou, Hunan Province, 412000 Patentee after: Zhuzhou Sanjiang building materials Machinery Manufacturing Co.,Ltd. Address before: 412000 No. 209-6, second floor, office building, No. 461, Tongxia Road, Shifeng District, Zhuzhou City, Hunan Province Patentee before: Zhuzhou Sanjiang building materials Machinery Manufacturing Co.,Ltd. |
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