WO2017181548A1 - Chambre de combustion de four rotatif - Google Patents

Chambre de combustion de four rotatif Download PDF

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Publication number
WO2017181548A1
WO2017181548A1 PCT/CN2016/091987 CN2016091987W WO2017181548A1 WO 2017181548 A1 WO2017181548 A1 WO 2017181548A1 CN 2016091987 W CN2016091987 W CN 2016091987W WO 2017181548 A1 WO2017181548 A1 WO 2017181548A1
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WO
WIPO (PCT)
Prior art keywords
combustion chamber
rotary kiln
barrier
barrier wall
chamber body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/091987
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English (en)
Chinese (zh)
Inventor
胡俊杰
李彦文
付明录
祁卫玺
肖述兵
何德成
孙明
朵国良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhu Xiaotao
Original Assignee
Zhu Xiaotao
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhu Xiaotao filed Critical Zhu Xiaotao
Publication of WO2017181548A1 publication Critical patent/WO2017181548A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/30—Arrangements of partitions

Definitions

  • the invention relates to the technical field of rotary kiln, in particular to a rotary kiln combustion chamber.
  • the raw material enters from the kiln tail, and the material calcined at a high temperature in the kiln enters the cooling machine from the kiln head through the moving chute.
  • the unburned volatiles in the flue gas and part of the dust are transferred to the post-kiln combustion chamber for secondary combustion, and then enter the waste heat boiler.
  • the raw material is fully burned into a calcined coke, and if the dust and volatile matter in the combustion chamber cannot be fully burned or deposited, it will enter the waste heat boiler, causing the boiler to easily accumulate too much dust, causing the boiler differential pressure to be too large, affecting safe operation, resulting in the boiler stopping.
  • the rotary kiln was forced to stop the kiln, the lining life was damaged.
  • the sedimentation chamber is used after the small and medium-sized rotary kiln, and the sedimentation chamber can fully realize the dust deposition, but it is difficult to realize the re-burning of the volatile matter in the flue gas, and the utilization efficiency of the waste heat cannot be improved.
  • the combustion chamber is usually used after the large rotary kiln, and the combustion chamber can realize secondary combustion of volatiles in the flue gas, increase the temperature of the flue gas, improve the utilization efficiency of waste heat, and realize waste heat power generation.
  • the direct combustion chamber behind the large rotary kiln is the patented technology of Metso Kiln.
  • the technical principle of the combustion chamber is that the dust and the unburned volatiles are both burned in the combustion chamber.
  • the U-shaped combustion chamber is lower than the Metso kiln combustion chamber.
  • the flue gas flow enters the waste heat boiler, resulting in serious accumulation of ash in the waste heat boiler.
  • the present invention provides a rotary kiln combustion chamber, which can reduce the deposition effect in the waste heat boiler, ensure the boiler pressure difference and its normal operation and protect the rotary kiln lining.
  • a rotary kiln combustion chamber comprising a combustion chamber body and two respectively connected to the combustion chamber body At the same end of the inlet and outlet, the combustion chamber body protrudes from the inner wall toward the air flow passage with a barrier wall.
  • the combustion chamber body is formed by at least three stages of bending, and the inlet and the outlet are respectively disposed at both ends of the combustion chamber body.
  • the combustion chamber body is of a straight cylinder type.
  • barrier wall is perpendicular to the direction of the airflow.
  • At least one of the barrier walls is inclined toward the outlet direction.
  • the barrier wall is plural, and at least one of the barrier walls has a height different from that of the other barrier walls.
  • the rotary kiln combustion chamber comprises a barrier wall located in the middle of one inner wall and a barrier wall on both sides of the barrier wall in the middle portion and adjacent to the inlet and the outlet respectively, the central barrier wall having the lowest height .
  • At least two inner walls on both sides of the airflow direction of the combustion chamber body are provided with the barrier wall.
  • barrier walls on the opposite inner walls of the combustion chamber body are spaced apart and alternately arranged in the direction of the air flow.
  • barrier walls on the opposite inner walls of the combustion chamber body are staggered in a direction perpendicular to the direction of the air flow.
  • the airflow passage can block the passing airflow, and the airflow collides with the corresponding barrier wall to generate a foldback, which increases the flow path of the airflow and reduces the flow speed thereof.
  • the combustion rate of unburned sufficient volatiles in the flue gas and dust in the airflow and the degree of precipitation in the combustion chamber body are improved, and the deposition effect in the waste heat boiler is reduced.
  • FIG. 1 is a schematic view showing the structure of a combustion chamber according to Embodiment 1 of the present invention.
  • Embodiment 2 is a comparison of parameters of a combustion chamber according to Embodiment 1 of the present invention before and after a barrier wall is provided on a bottom wall of a horizontal section of a U-shaped combustion chamber body.
  • Figure 3 is a schematic view showing the structure of a combustion chamber according to Embodiment 2 of the present invention.
  • Figure 4 is a schematic view showing the structure of a combustion chamber according to Embodiment 3 of the present invention.
  • the rotary kiln combustion chamber of the present embodiment includes a combustion chamber body 10 and an inlet 11 and an outlet 12 respectively connected at two different ends of the combustion chamber body 10, and the combustion chamber body 10 protrudes from the inner wall toward the air flow passage with a barrier wall 13 .
  • the combustion chamber body 10 of the present embodiment is U-shaped, including a horizontal section 10a fixed on a support portion such as the ground and a vertical inlet section 10b, an outlet section 10c, an inlet 11 and a top portion of the horizontal section 10a.
  • the outlets 12 are respectively connected to the inlet section 10b and the outlet section 10c at both ends of the combustion chamber body 10.
  • the flue gas and part of the dust discharged from the rotary kiln enter the combustion chamber from the inlet section 10b, and are discharged from the outlet section 10c after the secondary combustion through the horizontal section 10a. It is discharged to the waste heat boiler, and by increasing the temperature of the flue gas, the utilization efficiency of waste heat can be increased.
  • each barrier wall 13 is perpendicular to the airflow direction X of the corresponding section thereof, so that the airflow has the most direct blocking effect, and the blocked airflow is mostly perpendicular to the barrier wall 13
  • the flow forms convection with the inflowing airflow behind, reducing the flow rate of the airflow.
  • the height of the at least one barrier wall 13 is different from the other barrier walls 13.
  • the horizontal section 10a of the rotary kiln combustion chamber includes a barrier wall 13 in the middle of one inner wall and a barrier wall 13 on both sides of the barrier wall 13 in the middle and adjacent to the inlet 11 and the outlet 12, respectively, and the central barrier wall 13 has the lowest height.
  • the barrier wall 13 at both ends is higher than the intermediate barrier wall 13 so that the airflow at both ends can be blocked by the barrier wall just after entering the horizontal section 10a.
  • the airflow flows through
  • the central barrier wall 13 and the central barrier wall 13 have the lowest velocity, so that the gas accelerates and collides to the barrier wall 13 near the outlet 12, and then accelerates and folds back, and the rear airflow again forms a sharp collision deceleration, increasing the flow path of the airflow and slowing down the flow rate.
  • each of the barrier walls 13 can produce a reentry function, and can function to block the precipitated flue gas and the particulate matter in a part of the dust to float again.
  • the height of the barrier wall 13 in the middle is 1.3 m
  • the height of the barrier wall 13 near the inlet 11 and the outlet 12 is 2.5 m
  • the end of the horizontal section 10a near the inlet 11 is provided with a 24 cm thick refractory brick layer
  • the barrier wall 13 is A 37 cm thick refractory brick layer
  • the barrier wall 13 near the inlet 11 is about 3.8 m from its nearest end
  • the barrier wall 13 near the outlet 12 is about 3.5 m from its nearest end.
  • FIG. 2 is a comparison of parameters before and after the barrier wall 13 is disposed on the bottom wall of the horizontal section 10a of the U-shaped combustion chamber body 10.
  • the temperature of the A and the kiln head is lowered, and the temperature of the calcination zone is lowered.
  • the control is stable, and the exit temperature of the combustion chamber is significantly reduced by 50-1000C, both within the design value.
  • B. The vacuum pressure control of the kiln head and the kiln tail is stable, and the frequency of the main induced draft fan is reduced by about 10HZ. It is stable before operation and has obvious power saving.
  • the amount of dust in the flue gas is significantly reduced, and the ash accumulation of the waste heat boiler economizer is greatly reduced. It is once cleaned every two months and reduced to at least four months of cleaning.
  • This embodiment only shows the case where the inner wall of the lower portion of the horizontal section 10a of the U-shaped combustion chamber body 10 is provided with the barrier wall 13. It can be understood that the inlet section 10b and the outlet section 10c of the U-shaped combustion chamber body 10 can also be disposed. There is a corresponding barrier wall 13.
  • the barrier wall 13 is also applicable to other shapes of the combustion chamber body, such as "S" shape, "Z” shape, "W” shape, "V” shape, and straight type.
  • At least one of the barrier walls 13 of the present embodiment is inclined toward the outlet 12.
  • the barrier wall 13 near the inlet 11 is inclined toward the inlet 11, and the top portion thereof forms a constricted space with the adjacent inner wall of the end portion, and the airflow flowing in from the inlet 11 enters the constricted wall along the barrier wall 13 and the detour path is extended again.
  • the inclination of the barrier wall 13 near the outlet 12 can also form a space for the constriction with the adjacent barrier wall 13 or the end inner wall adjacent thereto, extending the path of the corresponding portion, indirectly prolonging the combustion and precipitation time.
  • the inner walls of the horizontal section 10a of the airflow direction X of the combustion chamber body 10 of the present embodiment are each provided with a barrier wall 13.
  • the inner walls of the inlet section 10b and the outlet section 10c may also be provided with a barrier wall 13.
  • the barrier walls 13 on the upper and lower walls of the horizontal section 10a are spaced apart and alternately arranged in the direction of the airflow X, i.e., the barrier walls 13 on both are staggered in the direction of the airflow X.
  • the barrier walls 13 on the two inner walls are staggered in a direction perpendicular to the airflow direction X, that is, the barrier walls 13 on the two partially overlap in the extending direction to form a circuitous path, increasing the number of collisions between the airflow and the barrier wall 13 and The number of collisions between airflow and airflow.
  • the airflow passage can block the passing airflow, and the airflow collides with the corresponding barrier wall to generate a foldback, which increases the flow path of the airflow and reduces the flow speed thereof.
  • the combustion rate of unburned sufficient volatiles in the flue gas and dust in the airflow and the degree of precipitation in the combustion chamber body are improved, and the deposition effect in the waste heat boiler is reduced.
  • the technology is universal in U-shaped combustion chamber application, suitable for all large rotary kiln combustion chambers. It can be used by carbon enterprises and electrolytic aluminum enterprises in China to build large-scale rotary kiln. It can also be used in similar occasions in other industries. Good promotion value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)

Abstract

L'invention concerne une chambre de combustion de four rotatif comprenant un corps de chambre de combustion (10) et une entrée (11) et une sortie (12) raccordées à deux extrémités différentes du corps de chambre de combustion (10), ledit corps de chambre de combustion (10) ayant des parois barrières (13) faisant saillie de sa paroi interne dans le trajet de flux d'air ; au moyen des parois barrières (13) faisant saillie de la paroi interne du corps de chambre de combustion (10), le passage d'un flux d'air peut être entravé dans le trajet du flux d'air. Le flux d'air entrant en collision avec une paroi barrière correspondante (13) produit des inversions, ce qui rallonge le trajet de circulation du flux d'air et abaisse la vitesse de circulation, augmente le taux de combustion de substances volatiles non totalement brûlées dans le gaz de combustion et de la poussière dans le flux d'air ; cela augmente également le degré de précipitation dans le corps de chambre de combustion (10), ce qui diminue les effets de dépôt dans la chaudière de récupération de chaleur.
PCT/CN2016/091987 2016-04-18 2016-07-28 Chambre de combustion de four rotatif Ceased WO2017181548A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201620323912.7 2016-04-18
CN201620323912.7U CN205718426U (zh) 2016-04-18 2016-04-18 一种回转窑燃烧室

Publications (1)

Publication Number Publication Date
WO2017181548A1 true WO2017181548A1 (fr) 2017-10-26

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PCT/CN2016/091987 Ceased WO2017181548A1 (fr) 2016-04-18 2016-07-28 Chambre de combustion de four rotatif

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CN (1) CN205718426U (fr)
WO (1) WO2017181548A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108826630B (zh) * 2018-06-12 2023-12-19 福建优净星环境科技有限公司 一种高效除菌的隐形出风口装置
CN109282641A (zh) * 2018-08-28 2019-01-29 江苏金牛环保工程设备有限公司 一种固体废盐热解氧化专用回转窑
CN111486471A (zh) * 2019-07-25 2020-08-04 国家电投集团黄河上游水电开发有限责任公司 一种燃烧室阻尼装置
CN114452722A (zh) * 2021-12-27 2022-05-10 杰瑞环保科技有限公司 热脱附设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0880431A (ja) * 1994-09-13 1996-03-26 Mitsui Eng & Shipbuild Co Ltd 移動床装置
JPH10267238A (ja) * 1997-03-25 1998-10-09 Nikko Kinzoku Kk 有機塩素系化合物を含む産業廃棄物の焼却処理方法及びそれを実施するための焼却炉
JP2001226110A (ja) * 2000-02-17 2001-08-21 Yoji Hirai 活性炭製造装置及び方法
CN102745925A (zh) * 2012-07-20 2012-10-24 息烽捷浪建材开发有限公司 煅烧磷石膏的回转炉窑

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0880431A (ja) * 1994-09-13 1996-03-26 Mitsui Eng & Shipbuild Co Ltd 移動床装置
JPH10267238A (ja) * 1997-03-25 1998-10-09 Nikko Kinzoku Kk 有機塩素系化合物を含む産業廃棄物の焼却処理方法及びそれを実施するための焼却炉
JP2001226110A (ja) * 2000-02-17 2001-08-21 Yoji Hirai 活性炭製造装置及び方法
CN102745925A (zh) * 2012-07-20 2012-10-24 息烽捷浪建材开发有限公司 煅烧磷石膏的回转炉窑

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