JPH0536096B2 - - Google Patents
Info
- Publication number
- JPH0536096B2 JPH0536096B2 JP61084354A JP8435486A JPH0536096B2 JP H0536096 B2 JPH0536096 B2 JP H0536096B2 JP 61084354 A JP61084354 A JP 61084354A JP 8435486 A JP8435486 A JP 8435486A JP H0536096 B2 JPH0536096 B2 JP H0536096B2
- Authority
- JP
- Japan
- Prior art keywords
- fluidized
- clinker
- furnace
- seed
- kiln
- 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.)
- Expired - Lifetime
Links
- 238000010304 firing Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 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
- 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、流動焼成炉の起動方法に関するもの
で、詳しくは、セメントやアルミナなどの粉末原
料を流動焼成炉で焼成するに際して、その流動焼
成炉の起動方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for starting a fluidized fluidized kiln, and more specifically, when firing powder raw materials such as cement or alumina in a fluidized kiln. This is related to the startup method.
従来の技術
従来のセメント粉末原料を焼成する流動焼成炉
の起動方法は、その流動焼成炉を空の状態にして
流動焼成炉のバーナに着火するとともに流動焼成
炉内に空気を導入して該炉内を昇温させ、つぎ
に、流動媒体としての種クリンカを該炉内に投入
し、該炉内に前記種クリンカによる適当な層高と
温度（約1350℃）の流動層を形成させ、このの
ち、セメント粉末原料を該炉内に投入していた。
そして、前記種クリンカとしては、所定の粒径範
囲（１〜５mm）に揃えたものとするが、その形状
については、流動焼成によつて得られた球状（後
述する形状係数が１）のセメントクリンカをその
まま使用していた。BACKGROUND TECHNOLOGY The conventional method for starting a fluidized furnace for firing cement powder raw materials is to empty the fluidized fluidized furnace, ignite the burner of the fluidized furnace, and introduce air into the fluidized furnace to start the furnace. Next, a seed clinker as a fluidized medium is introduced into the furnace, and a fluidized bed with an appropriate bed height and temperature (approximately 1350°C) is formed by the seed clinker in the furnace. Afterwards, cement powder raw material was put into the furnace.
The seed clinker has a predetermined particle size range (1 to 5 mm), and its shape is a spherical cement (with a shape factor of 1, which will be described later) obtained by fluidized firing. Clinker was used as is.
発明が解決しようとする問題点
前述のように、従来の流動焼成炉の起動方法に
おいては、流動焼成炉の起動時に流動媒体として
使用する種クリンカの形状が球状であるため、す
なわち、形状係数（形状係数は、
粒子と同体積の球の表面積／粒子の外部表面積で表わさ
れる。）が１
であるため、一瞬停止したり、塊ができたりし
て、初期の流動が良好でないという問題点があ
る。すなわち、安定運転中は、クリンカの形状係
数が１でも、流動に問題は生じないが、起動時の
昇温中における種クリンカの形状係数は流動床内
の流動に大きく影響する。つまり、起動時の昇温
中は、流動空気の温度が低く、膨張量が少なく、
流動空気の上昇速度が遅く、浮力が足りないた
め、形状係数１の種クリンカでは、一瞬停止をし
たり、それぞれの種クリンカの表面の液相が相互
に付着し合つて塊ができたりして流動状態が不安
定になる。本発明は、このような問題点を解決し
ようとするものである。すなわち、本発明は、流
動焼成炉内の初期の流動を良好にし、立上り時の
運転を容易にすることができる流動焼成炉の起動
方法を提供することを目的とするものである。Problems to be Solved by the Invention As mentioned above, in the conventional method for starting a fluidized fluidized kiln, since the shape of the seed clinker used as a fluidizing medium at the time of starting the fluidized kiln is spherical, that is, the shape factor ( The shape factor is
It is expressed as the surface area of a sphere with the same volume as the particle/the external surface area of the particle. ) is 1, there is a problem that the initial flow is not good because it stops momentarily or lumps form. That is, during stable operation, even if the shape factor of the clinker is 1, there will be no problem with the flow, but the shape factor of the seed clinker during the temperature rise at startup greatly affects the flow in the fluidized bed. In other words, during the temperature rise at startup, the temperature of the flowing air is low, the amount of expansion is small,
Because the rising speed of the flowing air is slow and the buoyancy is insufficient, seed clinker with a shape factor of 1 may stop momentarily or the liquid phase on the surface of each seed clinker may adhere to each other and form lumps. The flow state becomes unstable. The present invention attempts to solve these problems. That is, an object of the present invention is to provide a method for starting a fluidized fluidized furnace that can improve the initial flow in the fluidized fluidized furnace and facilitate operation at startup.
問題点を解決するための手段
流動焼成炉の起動時に使用する種クリンカの形
状係数を0.6〜0.8とした。すなわち、本発明の構
成は、粉末原料を流動焼成する流動焼成炉の起動
時の流動媒体として、はじめに形状係数が0.6〜
0.8の種クリンカだけを用い、該流動焼成炉の内
部に前記種クリンカによる高温の流動層を形成さ
せたのち、該流動焼成炉に粉末原料を投入するこ
とを特徴としている。Means for solving the problem The shape factor of the seed clinker used when starting up the fluidized fluidized kiln was set to 0.6 to 0.8. That is, the configuration of the present invention is such that a fluid medium with a shape factor of 0.6 to
The method is characterized in that only a seed clinker of 0.8 mm is used to form a high-temperature fluidized bed with the seed clinker inside the fluidized fluidized kiln, and then the powder raw material is introduced into the fluidized kiln.
作 用
流動焼成炉の起動時の流動媒体として使用する
種クリンカの形状係数の上限が0.8であるため、
形状係数が１である従来の種クリンカのような一
瞬停止などの流動悪化がなく、またその形状係数
の下限が0.6であるため、流動焼成炉のフリーボ
ードへの飛散などがなく、したがつて、起動時の
セツトされた風速に対して初期の流動が良好とな
り、立上り時の運転が容易となる。Effect Since the upper limit of the shape factor of the seed clinker used as the fluidizing medium at the time of startup of the fluidized kiln is 0.8,
Unlike conventional seed clinker with a shape factor of 1, there is no flow deterioration such as momentary stoppage, and the lower limit of the shape factor is 0.6, so there is no scattering on the free board of the fluidized kiln. , the initial flow is good for the set wind speed at start-up, and operation at start-up becomes easier.
実施例
図は本発明の方法を実施する装置の一例を示し
ている。図において、１はセメントの粉末原料を
焼成する流動焼成炉、２は前記流動焼成炉１で焼
成された高温のクリンカを導入してそのクリンカ
を空気によつて急冷するクーラ、３は前記流動焼
成炉１に種クリンカを供給する種クリンカ供給装
置、４は主排風機、５はセメント粉末原料供給装
置、６はサスペンシヨンプレヒータの最上段サイ
クロン、７は最下段サイクロン、８は仮焼炉、９
は前記流動焼成炉１に設けられたバーナ、１０は
前記クーラ２からの排気を該流動焼成炉１に供給
する燃焼用二次空気ダクトである。EXAMPLE The figure shows an example of a device implementing the method of the invention. In the figure, 1 is a fluidized firing furnace for firing powder raw materials for cement, 2 is a cooler that introduces the high-temperature clinker fired in the fluidized fluidized firing furnace 1 and rapidly cools the clinker with air, and 3 is a fluidized firing furnace for the fluidized firing furnace. A seed clinker supply device that supplies seed clinker to the furnace 1, 4 a main exhaust fan, 5 a cement powder raw material supply device, 6 an uppermost cyclone of a suspension preheater, 7 a lowermost cyclone, 8 a calciner, 9
10 is a burner provided in the fluidized firing furnace 1, and 10 is a combustion secondary air duct that supplies exhaust gas from the cooler 2 to the fluidized fluidized firing furnace 1.
図示のように構成されたセメント流動焼成装置
における流動焼成炉１の起動方法は、まず、流動
焼成炉１を空の状態にしてバーナ９に着火すると
ともに流動焼成炉１内に空気を導入して流動焼成
炉１内を昇温させ、つぎに、後述する流動媒体と
しての種クリンカを種クリンカ供給装置３から流
動焼成炉１内に投入し、流動焼成炉１内に前記種
クリンカによる層高比約1.5の層高と約1350℃の
温度の流動層を形成させ、こののち、種クリンカ
供給装置３からの種クリンカの投入を停止すると
ともにセメント粉末原料供給装置５からサスペン
シヨンプレヒータなどの所定の経路を経て流動焼
成炉１内にセメントの粉末原料を投入する。 The method of starting up the fluidized fluidized furnace 1 in the cement fluidized fluidized firing apparatus configured as shown in the figure is to first empty the fluidized fluidized furnace 1, ignite the burner 9, and introduce air into the fluidized fluidized furnace 1. The temperature inside the fluidized firing furnace 1 is raised, and then seed clinker as a fluidized medium, which will be described later, is introduced into the fluidized firing furnace 1 from the seed clinker supply device 3. A fluidized bed with a bed height of about 1.5 and a temperature of about 1350°C is formed, and then the seed clinker feed from the seed clinker feeder 3 is stopped, and the cement powder raw material feeder 5 is fed to a predetermined location such as a suspension preheater. Cement powder raw material is introduced into the fluidized fluidized kiln 1 through a passage.
ここで、本発明においては、種クリンカとして
は、形状係数が0.6〜0.8のものを使用する。その
種クリンカの製造例としては、流動焼成されたま
まのセメントクリンカは球形であるため、すなわ
ち、形状係数が１であるため、その球形のクリン
カを破砕機にかけて破砕して形状係数を0.6〜0.8
に下げた多面体のクリンカとし、これを適当に篩
分けして、その代表寸法を１〜５mmの範囲に揃え
る。 Here, in the present invention, a seed clinker having a shape factor of 0.6 to 0.8 is used. As an example of manufacturing this type of clinker, since the cement clinker that has been fluidized and fired is spherical, that is, the shape factor is 1, the spherical clinker is crushed by a crusher to have a shape factor of 0.6 to 0.8.
A polyhedral clinker is prepared, and the clinker is suitably sieved so that its representative dimensions are in the range of 1 to 5 mm.
このように、形状係数が0.6〜0.8である種クリ
ンカを使用することにより、流動焼成炉１の初期
の流動が良好になる。すなわち、本発明者がテス
トプラントで実験をしたところ、種クリンカの形
状が0.8を越えるものでは、セツト風速に対して、
一瞬停止など、流動状態が急激に形状係数１の球
形のクリンカと同様に悪化することが確認され
た。また形状係数が0.6より小さくなると、セツ
ト風速に対して、流動焼成炉１のフリーボードへ
の飛散が急激に起り、安定した流動状態を得るこ
とができないことを確認した。なおアルミナの流
動焼成炉においても、同様な実験結果が得られ
た。 In this way, by using a seed clinker with a shape factor of 0.6 to 0.8, the initial flow of the fluidized fluidized kiln 1 is improved. In other words, when the present inventor conducted an experiment at a test plant, it was found that when the seed clinker shape exceeds 0.8, the
It was confirmed that the flow state suddenly deteriorated, such as momentary stoppage, similar to that of a spherical clinker with a shape factor of 1. It was also confirmed that when the shape factor was smaller than 0.6, scattering to the freeboard of the fluidized fluidized kiln 1 occurred rapidly in response to the set wind speed, making it impossible to obtain a stable fluidized state. Similar experimental results were obtained in an alumina fluidized fluidized furnace.
発明の効果
本発明は、粉末原料を流動焼成する流動焼成炉
の起動時に、流体媒体として、形状係数が0.6〜
0.8の種クリンカを使用するので、一瞬停止や塊
の生成およびフリーボードへの飛散などがなく、
初期の流動が安定し、立上り時の運転が容易とな
るEffects of the Invention The present invention provides a fluid medium with a shape factor of 0.6 to
Since 0.8 seed clinker is used, there is no momentary stoppage, formation of lumps, or scattering on the freeboard.
The initial flow is stable, making it easier to operate at startup.
図は本発明の方法を実施する装置の一例を示し
た説明図である。
１……流動焼成炉、２……クーラ、３……種ク
リンカ供給装置、４……主排風機、５……セメン
ト粉末原料供給装置、６……最上段サイクロン、
７……最下段サイクロン、８……仮焼炉、９……
バーナ、１０……燃焼用二次空気ダクト。
The figure is an explanatory diagram showing an example of an apparatus for carrying out the method of the present invention. 1... Fluidized fluidized kiln, 2... Cooler, 3... Seed clinker supply device, 4... Main exhaust fan, 5... Cement powder raw material supply device, 6... Top stage cyclone,
7... Bottom cyclone, 8... Calciner, 9...
Burner, 10...Secondary air duct for combustion.
Claims (1)
の流動媒体として、はじめに形状係数が0.6〜0.8
の種クリンカだけを用い、該流動焼成炉の内部に
前記種クリンカによる高温の流動層を形成させた
のち、該流動焼成炉に粉末原料を投入することを
特徴とする、流動焼成炉の起動方法。1 Initially, the shape factor is 0.6 to 0.8 as the fluidized medium at the time of startup of the fluidized fluidized furnace for fluidized fluidized firing of powder raw materials.
A method for starting a fluidized kiln, comprising using only the seed clinker, forming a high-temperature fluidized bed with the seed clinker inside the fluidized kiln, and then charging a powder raw material into the fluidized kiln. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8435486A JPS62241545A (en) | 1986-04-14 | 1986-04-14 | Starting method for fluidized kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8435486A JPS62241545A (en) | 1986-04-14 | 1986-04-14 | Starting method for fluidized kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62241545A JPS62241545A (en) | 1987-10-22 |
| JPH0536096B2 true JPH0536096B2 (en) | 1993-05-28 |
Family
ID=13828177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8435486A Granted JPS62241545A (en) | 1986-04-14 | 1986-04-14 | Starting method for fluidized kiln |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62241545A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0717411B2 (en) * | 1986-08-29 | 1995-03-01 | 川崎重工業株式会社 | Raw material supply method in cement clinker manufacturing equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4994578A (en) * | 1973-01-16 | 1974-09-07 | ||
| JPS6032086A (en) * | 1983-08-03 | 1985-02-19 | 株式会社日立製作所 | Liquid crystal display |
-
1986
- 1986-04-14 JP JP8435486A patent/JPS62241545A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4994578A (en) * | 1973-01-16 | 1974-09-07 | ||
| JPS6032086A (en) * | 1983-08-03 | 1985-02-19 | 株式会社日立製作所 | Liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62241545A (en) | 1987-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |