JPS58202033A - Apparatus for calcination of particulate material - Google Patents
Apparatus for calcination of particulate materialInfo
- Publication number
- JPS58202033A JPS58202033A JP7259783A JP7259783A JPS58202033A JP S58202033 A JPS58202033 A JP S58202033A JP 7259783 A JP7259783 A JP 7259783A JP 7259783 A JP7259783 A JP 7259783A JP S58202033 A JPS58202033 A JP S58202033A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- supplied
- kiln
- jet stream
- calcination
- 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.)
- Granted
Links
- 238000001354 calcination Methods 0.000 title claims abstract description 22
- 239000011236 particulate material Substances 0.000 title abstract 3
- 239000000446 fuel Substances 0.000 claims abstract description 36
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000002829 reductive effect Effects 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims description 28
- 239000000725 suspension Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract 3
- 239000002912 waste gas Substances 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010011224 Cough Diseases 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1836—Heating and cooling the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/001—Calcining
- B01J6/004—Calcining using hot gas streams in which the material is moved
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
本発明ハ、キルンとサスペンションブレヒータとの関に
介装される粉粒体原料の仮焼装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention (c) relates to a calcination device for granular raw materials that is interposed between a kiln and a suspension breheater.
近年開発された仮焼炉を有するサスペンションプレヒー
タ付キルンにおいては、セメント焼成過程のうち、原料
の加熱分解（仮焼）過程に多くの熱量が消費されるとと
に着目し、加熱分解（石灰石の脱炭酸）のための仮焼炉
を別個に設け、従来、キルン焚口から供給した燃料の４
０〜６０％を仮焼炉へ直接供給する方式を採用している
。Recently developed kilns with suspension preheaters have calcining furnaces, focusing on the fact that a large amount of heat is consumed in the thermal decomposition (calcination) process of raw materials in the cement firing process. A separate calciner for decarbonation (decarboxylation) is installed, and the fuel that was conventionally supplied from the kiln
A method is adopted in which 0% to 60% is directly supplied to the calcining furnace.
本発明は、か＼る仮焼・炉において、燃料の燃焼反応を
効率よく行ない、それＫよって粉粒体原料の仮焼を十分
に行なうことができる装置を提供しようとするもので、
その要旨は、炉体下部を逆錐体状に形、成し、その縮少
部に開口を設けそ、これをキルンの立上りダクトに連結
し、炉体の側壁に燃料供給装置とその燃料を燃焼させる
ための２次空気導入口とを近接して設けるとともに該開
口上部の炉体内に噴流層を形成すべく炉体の側壁に粉粒
体原料の供給装置を接続し、該投入された原料を上記燃
料の燃焼熱により仮焼するように構成し、炉体の上部を
サスペンションプレヒータのサイクロンに連結してなる
粉粒体原料の仮焼装置にある。The present invention aims to provide an apparatus that can efficiently carry out the combustion reaction of fuel in such a calcination/furnace, and thereby sufficiently calcinate powdered raw materials.
The gist is to form the lower part of the furnace body into an inverted conical shape, provide an opening in the reduced part, connect this to the riser duct of the kiln, and install the fuel supply device and its fuel on the side wall of the furnace body. A secondary air inlet for combustion is provided in close proximity to the furnace body, and a supply device for powder and granular raw material is connected to the side wall of the furnace body to form a spouted bed in the furnace body above the opening. The apparatus is configured to perform calcination using combustion heat of the fuel, and the upper part of the furnace body is connected to a cyclone of a suspension preheater.
図示のものは、実施例であって、その構成は次のとおり
である。The illustrated example is an example, and its configuration is as follows.
１はロータリーキルン、２は立上抄ダクトである。３け
仮焼炉々体４の下部に形成された逆錐体状部４′の底部
に設けた開口であり、該開口は立上りダク）２に連結さ
れている。上記炉体４および逆錐体状部４′の側壁には
燃料バーナ６および６′が設けられ、燃料バーナ６に近
接して、咳バーナの燃料を燃焼させるための２次空気導
入ロアが配設されている。５，５′は粉粒体原料の投入
シュートであって、投入シュート５は上記２次空気導入
ロアに向けて原料を投入するよう配設され、投入シュー
ト５′は逆錐体状部４’に向けて原料を投入するよう配
設されている。1 is a rotary kiln, and 2 is an upright duct. This is an opening provided at the bottom of an inverted cone-shaped portion 4' formed at the lower part of the three-tier calcining furnace body 4, and the opening is connected to the rising duct 2. Fuel burners 6 and 6' are provided on the side walls of the furnace body 4 and the inverted conical portion 4', and a secondary air introduction lower is arranged adjacent to the fuel burner 6 for burning the fuel of the cough burner. It is set up. Reference numerals 5 and 5' designate input chutes for granular raw materials, and the input chute 5 is arranged to input the raw materials toward the secondary air introduction lower, and the input chute 5' is connected to the inverted cone-shaped portion 4'. It is arranged so that raw materials can be inputted for this purpose.
８は炉体に設けた縮少部、該縮少部８は、衝突ｌ１１９
をもつ拡大空間１０の底部に連結されている。１１は排
出管、１２はサスペンションプレヒーキルン１から排出
された燃焼排ガスは、立上りダクト２を通り、開口３か
ら炉体４に上向きの噴流とかつて導入される。一方、燃
料バーナ６あるいは燃料バーナ６．６′から燃料が供給
され、２次空気導入ロアより燃焼用空気が導入されると
ともＫ、シュート５又は及び５，５′より粉粒体原料が
供給される。8 is a reduced part provided in the furnace body, and this reduced part 8 is a collision l119
It is connected to the bottom of an enlarged space 10 having a diameter. Reference numeral 11 indicates an exhaust pipe, and 12 indicates a suspension. Combustion exhaust gas discharged from the preheating kiln 1 passes through a rising duct 2 and is introduced into the furnace body 4 through an opening 3 as an upward jet. On the other hand, fuel is supplied from the fuel burner 6 or fuel burner 6.6', combustion air is introduced from the secondary air introduction lower, and granular material is supplied from K, chute 5 or 5, 5'. be done.
上に２開口３は縮少部をなしてお９、これは逆錐体状部
４′に連結されているので、上記上向きの噴流によって
原料の噴流層が形成されるので原料の炉内帯領時間が長
い。このため炉内に投入された原料は燃料の燃焼熱によ
り効率よく仮焼される。そのさい、仮焼とともに脱硝を
行ないたい場合は、燃料バーナ６．６′から燃料を供給
するが、必要とされる脱硝の程度に応じて燃料バーナ６
′の燃料量を変える。The upper two openings 3 form a reduced part 9, which is connected to the inverted conical part 4', so that the upward jet forms a spouted layer of the raw material, so that the inner zone of the raw material is reduced. The territory time is long. Therefore, the raw material charged into the furnace is efficiently calcined by the combustion heat of the fuel. At that time, if it is desired to perform denitration together with calcination, fuel is supplied from the fuel burners 6 and 6', but depending on the degree of denitration required,
′ change the amount of fuel.
本発明の仮焼装置をセメントの焼成設備に適用し、仮焼
とともに脱硝を行なう場合について、以下詳述する。A case in which the calcination apparatus of the present invention is applied to cement calcination equipment to perform denitrification along with calcination will be described in detail below.
第１図において、キルンｌで発生した燃焼排ガスは、キ
ルン内部で熱交換したのち、１０００〜１３００℃で開
口３から、上向きの噴流として仮焼炉４に導入される。In FIG. 1, the combustion exhaust gas generated in the kiln 1 undergoes heat exchange inside the kiln, and then is introduced into the calciner 4 from the opening 3 at 1000 to 1300° C. as an upward jet stream.
仮焼炉４には、シュート５及び又はダにより５５０〜６
５０℃に予熱された原料が供給され、上記上向きの噴流
によって原料が流動化し、その一部が仮焼され、開口３
の上部には、セメント原料とその仮焼物ＣａＯの噴流層
が形成される。この噴流層は、原料の吸熱分解作用によ
り、上記燃焼排ガスの温度よりも低い８２０〜９５０℃
の温度に維持きれる。The calcining furnace 4 has a chute 5 and/or a diameter of 550 to 6
A raw material preheated to 50°C is supplied, and the above-mentioned upward jet fluidizes the raw material, a part of which is calcined, and the opening 3
A spouted layer of the cement raw material and its calcined product CaO is formed on the top. Due to the endothermic decomposition effect of the raw material, this spouted bed has a temperature of 820 to 950°C, which is lower than the temperature of the combustion exhaust gas.
Can be maintained at a temperature of
なお上記噴流層内に、キルン排ガス中に含まれる余剰空
気を消費する量以上の燃料をバーナ６′から供給すると
、燃料の一部は燃焼し、残部は、層内の激しい混合作用
と上記温度８２０〜９５０℃によって、急激に、Ｃｏ
、 Ｈ，、ＣＨ４等の還元性物質に分解され、層内は活
性度の高い還元性雰囲気となる。If more fuel is supplied from the burner 6' into the spouted bed than is necessary to consume the excess air contained in the kiln exhaust gas, part of the fuel will be burned, and the remaining part will be absorbed by the intense mixing action within the bed and the above-mentioned temperature. By 820-950℃, Co
, H, and CH4, and the inside of the layer becomes a highly active reducing atmosphere.
キんン排ガス導入用の開口３から排ガスと共に導入され
たＮＯＸの分子は、上記８２０〜９５０℃の還元性雰囲
気内で、噴流層において原料及び触媒として作用する仮
焼物ＣａＯと激しく衝突、分散を繰抄返すことによね、
速やかに還元される。The NOX molecules introduced together with the exhaust gas from the exhaust gas introduction opening 3 collide violently with calcined CaO, which acts as a raw material and catalyst in the spouted bed, in the above-mentioned reducing atmosphere of 820 to 950°C, and are dispersed. By repeating it,
will be promptly refunded.
キルン排ガス中に含オれるＮＯｘが還元される割合は、
バーナ６′より供給される燃料の供給量によって制御可
能である。通常、上記ＮＯＸの全量を還元するに資する
燃料の量は、セメント原料焼成に必要な燃料量の２０チ
程度であり、一方、仮焼に必要な燃料は６０チであるの
で、その量の燃料で理論的には、焼成設備全体から発生
するＮＯｘ量を無視可能な微量まで低減させることがで
きる。The rate at which NOx contained in kiln exhaust gas is reduced is:
It can be controlled by the amount of fuel supplied from the burner 6'. Normally, the amount of fuel that contributes to reducing the total amount of NOx mentioned above is about 20 inches, which is the amount of fuel required for cement raw material firing, and on the other hand, the fuel required for calcination is 60 inches, so that amount of fuel is Theoretically, the amount of NOx generated from the entire firing equipment can be reduced to a negligible amount.
噴流層の上部には、シュート５から供給された原料及び
仮焼物によって浮遊層が形成されている。導入ロアより
２次空気が供給され、それに近接して設けられたバーナ
６から燃料が供給される。噴流層内でガス化した燃料は
、浮遊層で新たな酸素の供給を受けて、急速に燃焼し、
セメント原料を仮焼する。しかし、浮遊層内の燃焼も、
浮遊原料の分解吸熱作用によ抄、９５０℃以上の高温度
に上昇することはなく、したがって、燃焼によって新た
にＮＯｘを発生するおそれはない。A floating layer is formed above the spouted bed by the raw materials and calcined material supplied from the chute 5. Secondary air is supplied from the introduction lower, and fuel is supplied from the burner 6 provided adjacent to it. The fuel gasified in the spouted layer receives new oxygen supply in the floating layer and burns rapidly.
Calcining cement raw materials. However, combustion within the floating layer also
Due to the endothermic effect of decomposition of the floating raw materials, the temperature does not rise to a high temperature of 950° C. or higher during papermaking, and therefore there is no risk of newly generating NOx due to combustion.
図示の実施例においては、浮遊層の上部に、縮少部８．
衝突壁９．拡大空間１０と排気管１１を有する混合層を
設置した。In the illustrated embodiment, on top of the floating layer there is a reduced portion 8.
Collision wall9. A mixed layer with an expansion space 10 and an exhaust pipe 11 was installed.
浮遊層より上昇してきた未燃分を含む燃焼ガスは、この
混合層において、まず縮少部８によって加速され、拡大
空間１０に入って減速し、次いで衝突壁９に衝突して反
転することにより、その速度変化と方向変化による混合
作用で、未燃分と残余の酸素とが十分に接触し、その間
に未燃分が燃焼する。ついで廃燃焼ガスは、拡大空間１
０から排出管１１を通って、サイクロン１ａに送られる
。In this mixed layer, the combustion gas containing unburned components that has risen from the floating layer is first accelerated by the contraction part 8, enters the expansion space 10 and decelerated, and then collides with the collision wall 9 and reverses. Due to the mixing effect due to the speed change and direction change, the unburned matter and the remaining oxygen come into sufficient contact, and the unburned matter is combusted during that time. Then, the waste combustion gas is transferred to expanded space 1.
0, passes through the discharge pipe 11, and is sent to the cyclone 1a.
本発明の仮焼装置は、炉体４の下部を逆錐体状に形成し
、その底部に開口３を設け、これにキルンの立上クダク
）２に連結し、炉体の側壁に燃料供給装置６とその燃料
を燃焼させるための２次空気導入ロアとを近接して設け
るとと本に該開口の上部の炉体内に噴流層を形成すべく
炉体の側壁に粉粒体原料の供給装置５が設けられている
ので、開口３の上部の炉体内には、開口３からの噴流に
よってセメント原料の噴流層が形成されるので、原料の
炉内帯留時間が長い。In the calcination device of the present invention, the lower part of the furnace body 4 is formed in the shape of an inverted cone, and an opening 3 is provided at the bottom of the furnace body 4, and the opening 3 is connected to the opening 3 of the kiln to supply fuel to the side wall of the furnace body. When the device 6 and the secondary air introduction lower for combusting the fuel are provided in close proximity, the granular raw material is supplied to the side wall of the furnace body to form a spouted bed in the furnace body above the opening. Since the device 5 is provided, a spouted layer of the cement raw material is formed in the furnace above the opening 3 by the jet from the opening 3, so that the residence time of the raw material in the furnace is long.
このため炉内に投入された原料は燃料の熔暁熱により効
率よく仮焼され、燃料の燃焼も十分に行なうことができ
る。Therefore, the raw material charged into the furnace is efficiently calcined by the melting heat of the fuel, and the fuel can be sufficiently combusted.
第１図は、本発明による粉粒体原料の仮焼装置の概略図
である。
１・・・・・・キルン、 ２・・・・・・立上松ダ
クト、３・・・・・・排ガス導入用の開口、
４・・・・・・仮焼炉、 ５・・・・・・原料供給装置
（シュート）、６．６′・・・・・・燃料供給装置（バ
ーナ）、７・・・・・・２次空気導入口、８・・・・・
・縮少部、９・・・・・・衝突壁、 １０・・・
・・・拡大空間、１１・・・・・・排気口、１２・・・
・・・サイクロン。FIG. 1 is a schematic diagram of a calcination device for powder raw materials according to the present invention. 1... Kiln, 2... Standing pine duct, 3... Opening for introducing exhaust gas, 4... Calcining furnace, 5... - Raw material supply device (chute), 6.6'...Fuel supply device (burner), 7...Secondary air inlet, 8...
・Reduction part, 9... Collision wall, 10...
... Expanded space, 11... Exhaust port, 12...
···Cyclone.
Claims (1)
て、これをキルンの立上りダクトに連結し、炉体の側壁
に燃料供給装置とその燃料を燃焼させるための２次空気
導入口とを近接して設けるとともに該開口上部の炉体内
に噴流層を形成すべく炉体の側壁に粉粒体原料の供給装
置を接続し、該投入された原料を上記燃料の燃焼熱によ
り仮焼するように構成し、炉体の上部ヲサスペンション
プレヒータのサイクロンニ連結してなる粉粒体原料の仮
焼装置。The lower part of the furnace body is formed in the shape of an inverted cone, and an opening is provided in the reduced part, which is connected to the riser duct of the kiln, and a fuel supply device and a secondary duct for burning the fuel are installed on the side wall of the furnace body. An air inlet is provided in close proximity to the air inlet, and a supply device for granular raw material is connected to the side wall of the furnace body in order to form a spouted bed in the furnace body above the opening, and the input raw material is transferred to the combustion heat of the fuel. This is a calcination device for powder and granular raw materials, which is configured to perform calcination using a suspension preheater and a cyclone connected to the upper part of a furnace body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7259783A JPS5938015B2 (en) | 1983-04-25 | 1983-04-25 | Calcination equipment for powder and granular raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7259783A JPS5938015B2 (en) | 1983-04-25 | 1983-04-25 | Calcination equipment for powder and granular raw materials |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8134476A Division JPS536267A (en) | 1976-07-08 | 1976-07-08 | Method and apparatus for reducing nitrogen oxides from combustion formed gases |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58202033A true JPS58202033A (en) | 1983-11-25 |
| JPS5938015B2 JPS5938015B2 (en) | 1984-09-13 |
Family
ID=13493965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7259783A Expired JPS5938015B2 (en) | 1983-04-25 | 1983-04-25 | Calcination equipment for powder and granular raw materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5938015B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015133161A1 (en) * | 2014-03-06 | 2015-09-11 | 太平洋エンジニアリング株式会社 | Cement burning apparatus, and method for denitrating exhaust gas from cement kiln |
| WO2019043036A1 (en) * | 2017-08-30 | 2019-03-07 | Flsmidth A/S | Low nox calciner |
| JPWO2021019753A1 (en) * | 2019-08-01 | 2021-02-04 |
-
1983
- 1983-04-25 JP JP7259783A patent/JPS5938015B2/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015133161A1 (en) * | 2014-03-06 | 2015-09-11 | 太平洋エンジニアリング株式会社 | Cement burning apparatus, and method for denitrating exhaust gas from cement kiln |
| JPWO2015133161A1 (en) * | 2014-03-06 | 2017-04-06 | 太平洋エンジニアリング株式会社 | Cement firing device and denitration method for cement kiln exhaust gas |
| WO2019043036A1 (en) * | 2017-08-30 | 2019-03-07 | Flsmidth A/S | Low nox calciner |
| CN111051802A (en) * | 2017-08-30 | 2020-04-21 | Fl史密斯公司 | Low NOx calciner |
| US10974992B2 (en) | 2017-08-30 | 2021-04-13 | Flsmidth A/S | Low NOx calciner |
| CN111051802B (en) * | 2017-08-30 | 2022-04-29 | Fl史密斯公司 | Low NOx calciner |
| JPWO2021019753A1 (en) * | 2019-08-01 | 2021-02-04 | ||
| WO2021019753A1 (en) * | 2019-08-01 | 2021-02-04 | 太平洋エンジニアリング株式会社 | Cement firing device and cement kiln exhaust gas denitrification method |
| KR20210015601A (en) * | 2019-08-01 | 2021-02-10 | 다이헤이요 엔지니어링 가부시키가이샤 | Cement firing apparatus and method of denitrification of cement kiln exhaust gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5938015B2 (en) | 1984-09-13 |
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