CN-121994018-A - Rotary hearth furnace pellet cooling equipment and method based on partition cooling and anti-scouring structure

CN121994018ACN 121994018 ACN121994018 ACN 121994018ACN-121994018-A

Abstract

The invention discloses rotary hearth furnace pellet cooling equipment and a method based on a partition cooling and anti-scouring structure, which relate to the technical field of rotary hearth furnace accessories, and comprise a rotary cylinder and a plurality of material-uniformizing guide plates, wherein the rotary cylinder is sequentially divided into a scouring-resistant slow cooling area and a uniform water cooling area which are functionally connected along the pellet cooling flow direction, the anti-scouring slow cooling zone is characterized in that a wear-resistant lining plate is fixedly paved on the inner surface of the anti-scouring slow cooling zone, a plurality of water-cooling spray rings are arranged on the outer side of the anti-scouring slow cooling zone, a plurality of rows of water-cooling tube bundles which are arranged in parallel are arranged in the uniform water cooling zone, a feeding cylinder is fixedly connected with a fixing plate which is rotationally connected with the anti-scouring slow cooling zone, and a stepped chute is arranged on the bottom plate of the feeding cylinder. The sectional cooling design of the invention realizes gradient cooling of the pellets, avoids cracking of the pellets caused by rapid cooling, and the stepped chute of the feeding cylinder weakens impact kinetic energy of the pellets through the inclination angle decreasing design, thereby reducing equipment abrasion.

Inventors

ZHONG JINXING
Pang Dongxing
ZHAO HAIYANG
LIU JIANMAO
WANG LIANBO
LIU WEIHONG
LIU XILONG

Assignees

河北津西新材料科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260109

Claims (9)

1. Rotary hearth furnace pellet cooling arrangement based on subregion cooling and scour protection structure, including supporting base (1), support base (1) top is provided with supporting roller (11) and rotating assembly (12), its characterized in that still includes: The rotary cylinder (2) and a plurality of material homogenizing guide plates (25), the rotary cylinder (2) is rotatably arranged at the top of the supporting base (1) through supporting rollers (11), the rotary cylinder (2) is sequentially divided into a flushing-resistant slow cooling zone (21) and a uniform water cooling zone (22) which are functionally connected along the pellet cooling flow direction from left to right, the material homogenizing guide plates (25) are adapted to cover the inner surfaces of the flushing-resistant slow cooling zone (21) and the uniform water cooling zone (22), the inner surface of the flushing-resistant slow cooling zone (21) is fixedly paved with a wear-resistant lining plate (4), a plurality of water cooling spray rings (3) are arranged outside the flushing-resistant slow cooling zone (21), and a plurality of rows of water cooling tube bundles which are arranged in parallel are arranged inside the uniform water cooling zone (22); The feeding cylinder (23), feeding cylinder (23) tip rigid coupling has fixed plate (231) with wash-resistant slow cooling district (21) swivelling joint, be provided with cascaded chute on feeding cylinder (23) bottom plate, cascaded chute contains a plurality of along pellet direction of delivery slope chute unit (6) that link up in proper order, adjacent inclination of chute unit (6) is the progressively setting of angle decline along pellet direction of delivery, feeding cylinder (23) inside still is provided with screening subassembly and powder absorbing subassembly.
2. The rotary hearth furnace pellet cooling device based on the partition cooling and anti-scouring structure according to claim 1, wherein the tail end of the stepped chute is provided with a short chute (62), the inclination angle of the short chute (62) is smaller than that of the last chute unit (6) in the stepped chute, the end of the short chute (62) extends to the middle position of the feeding barrel (23) along the radial direction of the feeding barrel (23), the bottom of the short chute (62) is fixedly provided with a plurality of protruding blocks (8), the protruding blocks (8) are all triangular, and the protruding blocks are distributed in an staggered array on the bottom plate of the feeding barrel (23) and are used for dispersing materials conveyed by the stepped chute unit (6).
3. The rotary hearth furnace pellet cooling device based on the partition cooling and scour prevention structure according to claim 1, wherein the screening assembly comprises a supporting rod (61), the supporting rod (61) is connected to the bottom of the chute unit (6), the chute unit (6) is connected with the inner wall of the feeding cylinder (23) through the supporting rod (61), the distance between the chute unit (6) and the bottom plate of the feeding cylinder (23) is smaller than the diameter of pellets to be conveyed, so that complete pellets are prevented from falling from a gap between the chute unit (6) and the bottom plate of the feeding cylinder (23), broken pellets generated in the conveying process are allowed to pass through between the chute unit (6) and the bottom plate of the feeding cylinder (23), a plurality of strip-shaped through holes (7) are formed in the bottom plate of the feeding cylinder (23), and each strip-shaped through hole (7) is located at the rear of the downstream of the corresponding chute unit (6) and is used for receiving and discharging the broken pellets passing through between the chute unit (6) and the bottom plate of the feeding cylinder (23).
4. The rotary hearth furnace pellet cooling device based on the partition cooling and anti-scouring structure according to claim 3, wherein a plurality of filtering holes (63) are distributed and formed in a bottom plate of the feeding barrel (23), a collecting box (64) communicated with the filtering holes (63) and the strip-shaped through holes (7) is arranged at the bottom of the feeding barrel (23), the collecting box (64) is used for receiving powder falling from the filtering holes (63) and the strip-shaped through holes (7), a drawing box (65) is detachably arranged on the side face of the collecting box (64), and sealing strips are arranged between the drawing box (65) and the collecting box in a matched mode.
5. The rotary hearth furnace pellet cooling device based on the partition cooling and anti-scouring structure according to claim 4, wherein an interception plate (71) is fixedly arranged at the lower edge of each strip-shaped through hole (7), the interception plate (71) circumferentially or locally extends along the lower edge of the strip-shaped through hole (7) and is used for guiding and intercepting broken balls, so that the broken balls are prevented from continuously sliding along the conveying direction due to inertia and directly falling into the subsequent cooling device, and meanwhile, the broken balls are guided to turn to fall into the strip-shaped through holes (7).
6. The rotary hearth furnace pellet cooling device based on the partition cooling and anti-scouring structure according to claim 1, wherein the powder suction assembly comprises a mixing box (53) and a circulating pipe (52), the mixing box (53) is installed on the outer side of a feeding cylinder (23), dust suction pipes (5) are arranged above two sides inside the feeding cylinder (23), dust suction ports (51) are formed in each dust suction pipe (5), the circulating pipe (52) is provided with two dust suction ports (51) which are communicated with the mixing box (53) through the corresponding circulating pipe (52), ceramic fiber filters are arranged on each circulating pipe (52), conveying pipes (54) are connected in a penetrating manner on the mixing box (53), air supplementing pipes (55) are installed on two sides of the conveying pipes (54), air supplementing nozzles (56) are arranged on the air supplementing pipes (55), the axes of the air supplementing nozzles (56) form included angles of 15-30 degrees with the axial center line of a feeding cylinder (23) and face the directions of the feeding cylinder (23) respectively, and the air supplementing pipes (23) are inclined towards the directions of the feeding cylinder (5) to guide the dust suction ports to form the dust suction ports along the direction of the feeding cylinder body (23).
7. The rotary hearth furnace pellet cooling device based on the partition cooling and scour prevention structure according to claim 6, wherein a heat-collecting pipe (57) is connected to the mixing box (53) in a penetrating way, an adjusting valve (58) is arranged on the heat-collecting pipe (57), an adjustable throttle valve is arranged on the conveying pipe (54), a temperature sensor is arranged inside the conveying pipe (54), a controller is arranged on the supporting base (1), a ceramic fiber filter is arranged on the heat-collecting pipe (57), and a pressure sensor is arranged inside the feeding cylinder (23), and the temperature sensor, the pressure sensor, the adjustable throttle valve and the adjusting valve (58) are all electrically connected with the controller.
8. The rotary hearth furnace pellet cooling method based on the partition cooling and anti-scouring structure adopts the rotary hearth furnace pellet cooling equipment based on the partition cooling and anti-scouring structure as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps: s1, feeding and preprocessing, namely discharging the pellets after roasting by a rotary hearth furnace, entering a feeding cylinder (23), separating broken pellets, fine powder and dust captured by a dust absorbing component by a stepped chute decelerating and buffering and screening component, and stably entering the rotary cylinder (2) to be guided by a material homogenizing guide plate (25) to form a uniform material layer; S2, scour prevention and slow cooling, namely, the pellets enter a scour prevention and slow cooling area (21), natural slow cooling is carried out for 3-5 minutes under the protection of a wear-resistant lining plate (4), and the whole temperature of the pellets is reduced to 900+/-50 ℃; S3, uniformly cooling the material layer in a partition way, namely, enabling the material layer to enter a uniform water cooling region (22), performing heat exchange with a water cooling tube bundle for 25-30 minutes, and enabling the surface temperature of the pellets to be reduced to 130+/-50 ℃ and the core temperature to be reduced to 150+/-50 ℃ through the cooperative cooling of a water cooling spray ring (3) and the water cooling tube bundle; S4, discharging and recycling, namely discharging the cooled pellets through a discharging cylinder (24), and recycling hot water of the water-cooling spray ring (3) and dust trapped by the powder suction assembly in the process to recycle waste heat and materials.
9. The rotary hearth furnace pellet cooling method based on the partition cooling and scour prevention structure according to claim 8, wherein in the uniform water cooling step, the cooling medium is water, the water inlet temperature is 25-40 ℃, the flow is adjusted according to the equipment size and the yield, and in the scour prevention and slow cooling step, the pellet material layer is directly scoured without using high-speed forced cooling air flow, and the method mainly relies on natural cooling, radiation heat dissipation or indirect heat exchange.

Description

Rotary hearth furnace pellet cooling equipment and method based on partition cooling and anti-scouring structure Technical Field The invention relates to the technical field of rotary hearth furnace accessories, in particular to rotary hearth furnace pellet cooling equipment and method based on a partition cooling and anti-scouring structure. Background After the rotary hearth furnace pellets are baked at the high temperature of 1200-1400 ℃, the temperature of the finished pellets is usually over 1000 ℃, and the finished pellets cannot directly enter the subsequent transportation, storage and smelting processes. On the one hand, if the high-temperature pellets are in direct contact with normal-temperature environment or conveying equipment, thermal stress is generated due to sudden temperature change, so that the pellets are cracked and pulverized, and the yield and the product quality are reduced, and on the other hand, the high-temperature pellets can also threaten the running safety of equipment in subsequent procedures and the occupational health of operators. Therefore, the high-temperature pellets of the rotary hearth furnace are efficiently cooled, and are key links for guaranteeing production continuity, improving product quality and maintaining production safety. The core of the conventional rotary hearth furnace pellet cooling equipment is that the cooling of pellets is realized through heat exchange, the basic working flow is that after high-temperature pellets are continuously discharged from a roasting area of the rotary hearth furnace, the pellets are sent into a closed or semi-closed cavity of the cooling equipment by a conveying mechanism, cooling medium is introduced into the cavity by the equipment, heat carried by the pellets is taken away through direct contact heat exchange or indirect contact heat exchange, the temperature of the pellets is gradually reduced to a safe area, and cooled finished pellets are sent to the next working procedure by an output mechanism. In addition, the single-zone air cooling or simple water cooling is adopted to perform one-cut quenching mode, the quenching mode directly causes rapid shrinkage of the surface of the pellets and high-temperature expansion of the interior, thermal stress concentration is caused, the pellets are cracked, the quality of products is seriously affected, meanwhile, the temperature of the pellets which enter the cooling zone is as high as 900-1100 ℃ and the hardness is extremely strong, and in the conveying and cooling processes, the pellets roll and collide due to self gravity and air flow disturbance to form severe scouring and abrasion on the conveying track of the equipment and the wall surface of the cooling cavity, and the strong abrasion can shorten the service life of the equipment and increase the maintenance cost. Disclosure of Invention Aiming at the defects of the prior art, the invention provides rotary hearth furnace pellet cooling equipment and a rotary hearth furnace pellet cooling method based on a partition cooling and anti-scouring structure, and solves the problems in the background art. In order to achieve the above purpose, the present invention adopts the following technical scheme: Rotary hearth furnace pellet cooling arrangement based on subregion cooling and scour protection structure, including supporting the base, it is provided with supporting roller and rotating assembly to support the base top, still includes: The rotary cylinder is arranged at the top of the supporting base in a rotating way through the supporting rollers, the rotary cylinder is sequentially divided into a scouring-resistant slow cooling zone and a uniform water cooling zone which are connected in function along the pellet cooling flow direction, the uniform material guide plates are adapted to cover the inner surfaces of the scouring-resistant slow cooling zone and the uniform water cooling zone, the inner surfaces of the scouring-resistant slow cooling zone are fixedly paved with wear-resistant lining plates, a plurality of water-cooling spray rings are arranged on the outer side of the scouring-resistant slow cooling zone, and a plurality of rows of water-cooling tube bundles which are arranged in parallel are arranged in the uniform water cooling zone; The feeding cylinder, feeding cylinder tip rigid coupling has the fixed plate with wash-resistant slow cooling zone swivelling joint, be provided with cascaded chute on the feeding cylinder bottom plate, cascaded chute contains a plurality of along pellet direction of delivery's slope chute unit that links up in proper order, adjacent chute unit's inclination is the progressively setting of angle decline along pellet direction of delivery, inside screening subassembly and the powder subassembly of inhaling of still being provided with of feeding cylinder. Further, the end of the stepped chute is provided with a short chute, the inclination angle of the short chute is smaller than th