JPH0226651A - Crushed material sorting apparatus - Google Patents
Crushed material sorting apparatusInfo
- Publication number
- JPH0226651A JPH0226651A JP17372688A JP17372688A JPH0226651A JP H0226651 A JPH0226651 A JP H0226651A JP 17372688 A JP17372688 A JP 17372688A JP 17372688 A JP17372688 A JP 17372688A JP H0226651 A JPH0226651 A JP H0226651A
- Authority
- JP
- Japan
- Prior art keywords
- crushing
- mill
- particles
- classification
- coarse
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title description 4
- 239000011362 coarse particle Substances 0.000 claims abstract description 18
- 238000010298 pulverizing process Methods 0.000 claims description 9
- 239000011802 pulverized particle Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 42
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003245 coal Substances 0.000 description 25
- 239000000047 product Substances 0.000 description 17
- 239000000843 powder Substances 0.000 description 13
- 239000010419 fine particle Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000008187 granular material Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 241001517013 Calidris pugnax Species 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は分級装置を有する粉砕装置に係り、特に分級部
に改良を加えた粉砕分級装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pulverizing device having a classification device, and particularly to a pulverizing and classifying device with an improved classification section.
例えば石炭燃焼用のボイラにおい、でも窒素酸化物（Ｎ
Ｏｘ）や未燃分の排出低減を行う低公害燃焼や、電力需
要の急速な変化に対応する急速負荷変動運用（ボイラに
対する給炭量の変化で対応）が実施され、これに伴い・
ボイラに石炭（微粉炭）を供給する微粉炭機（ミル）の
性能もより一層の向上が要求されている。For example, in coal-burning boilers, nitrogen oxides (N
Low-pollution combustion has been implemented to reduce emissions of Ox) and unburned matter, and rapid load fluctuation operation (responding to rapid changes in electricity demand by changing the amount of coal fed to the boiler) has been implemented.
The performance of pulverizers (mills) that supply coal (pulverized coal) to boilers is also required to be further improved.
石炭やセメント原料若しくは新素材原料等の塊状物を細
か（粉砕する粉砕機には何種かの形式があるが、粉砕テ
ーブルと複数のローラとを備えた竪型ミルが用いられて
いる。この形式のミルは基本性能が良（、今後火力発電
所ボイラの給炭としては代表機種となるものと思われる
。There are several types of pulverizers for pulverizing lumps such as coal, raw materials for cement, or raw materials for new materials into fine particles, but a vertical mill equipped with a pulverizing table and multiple rollers is used. This type of mill has good basic performance (and is expected to become the representative model for feeding coal to thermal power plant boilers in the future.
第８図を用いてこの粉砕装置の概略を先ず説明する。First, the outline of this crushing device will be explained using FIG. 8.
回転分級機のシャフト１２３内の給炭管を落下した石炭
１１３は粉砕部に至り、低速で回転する円板状の回転テ
ーブル１０３と、この回転テーブル１゜３の粉砕レース
面１０４に接触する粉砕ローラ１゜５との相対的な回転
により粉砕される。ミルケーシング１０１の基底部には
熱風１１１が導入され、この熱風１１１がエアスロート
１１０を介して粉砕部に吹き上げでいる。粉砕後の粉粒
体はこの熱風により乾燥されながらミルケーシング１０
１内を上昇する。ミルケーシング上部へ気流輸送された
粉粒体は分級部により分級され、所定の粒径のものは気
流と共にバーナ等の所定の機器に供給され、所定以上の
粒径のものは再度粉砕部に落下して粉砕される。The coal 113 that has fallen through the coal feed pipe in the shaft 123 of the rotary classifier reaches the crushing section, where it comes into contact with the disk-shaped rotary table 103 that rotates at a low speed and the crushing race surface 104 of this rotary table 1°3. It is pulverized by relative rotation with the roller 1°5. Hot air 111 is introduced into the base of the mill casing 101, and this hot air 111 is blown up into the grinding section through the air throat 110. The pulverized powder and granules are dried by this hot air and placed in a mill casing 10.
Rise within 1. The powder and granules transported by airflow to the upper part of the mill casing are classified by the classification section, and those of a predetermined particle size are supplied with the airflow to a predetermined equipment such as a burner, and those with a particle size larger than the predetermined size fall into the crushing section again. and shattered.
上述した竪型ミルの多くはミルケーシング上部に分級部
を有し、ミル内循環閉回路粉砕系を形成しているが、こ
のような系を有する装置では粉砕部の粉砕性能のみでな
く、分級部の分級性能も装置全体としての性能を大きく
左右する。Most of the vertical mills mentioned above have a classification section in the upper part of the mill casing, forming a closed-circuit grinding system within the mill. The classification performance of each section also greatly influences the performance of the entire device.
固定したカイトベーンを有する分級部に対して粉粒体含
有気流を導入することにより旋回流は発生させて分級を
行うサイクロンセパレータに代わり、最近では回転分級
機が多く使用されるようになってきた０回転分級機はシ
ャフト１２３に固定したロータ１１７に複数の羽根１１
６を、このロータ１１７の円周方向に形成し、粉砕テー
ブル１０３の駆動系とは別の駆動系によりこの羽根１１
６を回転させる構成となっている。粉砕部より熱風によ
り吹上られた粉粒体は回転する分級羽根１１６によって
生じる気流の遠心力の作用により所定の粒径よりも大き
い粒子は分級機の外周部に追いやられ、以後重力により
下降して粉砕部に再度供給される。一方所定の粒径より
も小さな粒子１１９は回転羽の間をすり抜けて通過し、
ダクト１２０をへて所定の機器に気流輸送される。In place of the cyclone separator, which performs classification by introducing a powder-containing airflow into a classification section with fixed kite vanes to generate a swirling flow, rotary classifiers have recently come into widespread use. The rotary classifier has a plurality of blades 11 on a rotor 117 fixed to a shaft 123.
6 is formed in the circumferential direction of the rotor 117, and the blades 11 are driven by a drive system different from the drive system of the crushing table 103.
6 is configured to rotate. Particles larger than a predetermined particle size are driven to the outer periphery of the classifier due to the action of the centrifugal force of the airflow generated by the rotating classification blades 116, and then descended by gravity. It is fed again to the crushing section. On the other hand, particles 119 smaller than a predetermined particle size slip through between the rotating blades,
The air is transported through the duct 120 to a predetermined device.
このような回転分級機が最近多く設置されるようになっ
ているが、その理由としては以下のことが考えられる。Recently, many rotary classifiers have been installed, and the following may be the reason for this.
（ｉ）以前にも増して製品微粉に対して正確な粒度分布
が要求されていること、この要求は特にセメントや新素
材の分野において厳しくなっている。(i) More than ever before, accurate particle size distribution is required for product fines, and this requirement is becoming particularly severe in the fields of cement and new materials.
（ｉｉ ）製品微粉が微粉炭である場合、微粉炭を使用
する発電所用ボイラの負荷応答性の向上が要求されティ
ること。この要求に対して従来のサイクロン式分級機を
有するミルで対応ずのは困難となってきており、回転数
制御の可能な回転式分級機を有する装置の方が断熱有利
となってきている等のことが挙げられる。(ii) When the product powder is pulverized coal, it is required to improve the load response of power plant boilers that use pulverized coal. It has become difficult to meet this demand with mills equipped with conventional cyclone classifiers, and equipment with rotary classifiers that can control the rotation speed are becoming more advantageous in heat insulation. This can be mentioned.
以上のように回転式分級機を有する粉砕装置の基本的性
能は高いが、次に示すような問題点もあり、その解決が
望まれている。As described above, although the basic performance of the crushing apparatus having a rotary classifier is high, there are problems as shown below, and it is desired to solve these problems.
先ず給炭（粉砕）容量を上昇させたり、或いは回転分級
機の回転数を増加させて分級性能を向上させようとする
場合に、第７図に示すように粉砕部から分級部に上昇し
ようとする粒子を高濃度に含む気流１２５と、分級部か
ら粉砕部に下降して戻ろうとする気流１２４とが衝突合
流してミルケーシング内に滞留部が生じるとという問題
がある。このような滞留部が生じるとミル内圧が増大し
て送風機に多大な負担をかけることになるばかりか、所
定の粒度を有する製品を得ることが困難となり、装置の
高負荷運用が不可能となる。なお、第７図及び第８図を
含めて、符号１０２は減速機、１０６はブラケット、１
０７は粉砕ローラ保持フレーム、１０８は油圧パイプ、
１０９は油圧シリンダ、１１２はウィンドボックス、１
１４は原料供給管、１２０は製品微粉ダクト、１２１は
回転分級機ケーシングである。First, when trying to improve the classification performance by increasing the coal feeding (pulverization) capacity or by increasing the rotation speed of the rotary classifier, the coal that rises from the crushing section to the classifying section as shown in Figure 7. There is a problem in that the airflow 125 containing a high concentration of particles is collided with the airflow 124 descending from the classification section to the crushing section and attempting to return, resulting in a stagnation section inside the mill casing. When such a stagnation occurs, the internal pressure of the mill increases, which puts a heavy burden on the blower, and it also becomes difficult to obtain a product with a predetermined particle size, making it impossible to operate the equipment under high load. . In addition, including FIGS. 7 and 8, the reference numeral 102 is a reducer, 106 is a bracket, and
07 is a crushing roller holding frame, 108 is a hydraulic pipe,
109 is a hydraulic cylinder, 112 is a wind box, 1
14 is a raw material supply pipe, 120 is a product fine powder duct, and 121 is a rotary classifier casing.
本発明は上述した問題点に鑑み構成したものであり、分
級機近傍のうち、滞留域が形成される部分を中心として
ガイド板を形成配置し、これにより気流を整流して滞留
域の発生を防止し、もって分級効率を向上させるように
した装置である。The present invention has been constructed in view of the above-mentioned problems, and a guide plate is formed and arranged around the area near the classifier where the stagnation area is formed, thereby rectifying the airflow and preventing the formation of the stagnation area. This device is designed to prevent this and thereby improve classification efficiency.
〔作用〕
回転分級機の遠心力によりミルケーシン内壁上で押しつ
けられるようにその円周方向に沿って流れる分級後の粗
粒は、ガイド板の上部で受は止められてその慣性力を失
い、重力によって粉砕部へと落下する。一方、粉砕ロー
ラで粉砕された後の微粒は送風ノズルからの噴射空気に
より上昇するが、前述のガイド板下部に衝突するように
流れて下降粒子群と混じり合うことなく回転分級部へと
上昇する０回転分綴部では微粒はそのままバーナへ供給
され、粗粉は気流の遠心力によりミルケーシング方向へ
分離される。これによりミル内部では石炭粒子を高濃度
で含有する上昇気流と、下降気流とが殆ど混じり合うこ
となく分離されて流れることになり、この結果余分な差
圧が発生しなくなり、送風機に対する負担が減少する。[Operation] The coarse particles that flow along the circumference of the mill casing and are pressed against the inner wall of the mill casing by the centrifugal force of the rotary classifier are stopped at the upper part of the guide plate, lose their inertial force, and become gravitational. The particles fall into the crushing section. On the other hand, the fine particles after being crushed by the crushing roller are lifted up by the air jetted from the blower nozzle, but they flow to collide with the lower part of the guide plate mentioned above and rise to the rotating classification section without mixing with the descending particle group. In the 0-rotation binding section, fine particles are supplied as they are to the burner, and coarse particles are separated in the direction of the mill casing by the centrifugal force of the air flow. As a result, inside the mill, the updraft containing a high concentration of coal particles and the downdraft flow separately with almost no mixing, and as a result, no extra pressure difference is generated, reducing the burden on the blower. do.
また分級部から粉砕部への粗粒フィードバックが極めて
効率良く行われるようになり、結果的に粉砕・分級効率
が向上する。In addition, feedback of coarse particles from the classification section to the crushing section becomes extremely efficient, resulting in improved crushing and classification efficiency.
以下本発明の実施例を図面を参考に具体的に説明する。 Embodiments of the present invention will be specifically described below with reference to the drawings.
第１図および第２図は本発明の第１の実施例を示す。1 and 2 show a first embodiment of the invention.
まず主として第２図おいて、符号１７は気流を制御する
ためのガイド板（以下「フローガイド」と称する）であ
る、このフローガイド１７は各粉砕ローラフの上部ミル
ケーシング１３に支持部を有する薄板構造とし、粉砕部
ケーシンク内壁面に直情接触固定しである第１ガイド部
１７ａと、この第１ガイド部１７ａからミル中心に向か
って下降するように展出する第２ガイド部１７ｂとから
構成しである０図示のローラミルの構成では粉砕ローラ
７は回転テーブル３の円周方向に対して１２０°間隔で
３基配置しであるが、これに対応してフローガイド１７
も各粉砕ローラフの上部に位置するよう３基等間隔で粉
砕部ケーシング円周方向に３基配置しである。またフロ
ーガイド１７の表面はセラミックスに代表される高硬度
材料によりコーティングしてあり、耐摩耗性を高く保持
している。First of all, mainly in FIG. 2, the reference numeral 17 is a guide plate (hereinafter referred to as "flow guide") for controlling airflow. It consists of a first guide part 17a that is fixed in direct contact with the inner wall surface of the crushing part casing, and a second guide part 17b that extends downward from the first guide part 17a toward the center of the mill. In the configuration of the roller mill shown in the figure, three crushing rollers 7 are arranged at 120° intervals in the circumferential direction of the rotary table 3.
The three crushing rollers are arranged at equal intervals in the circumferential direction of the crushing part casing so that they are located above each crushing roller ruff. Further, the surface of the flow guide 17 is coated with a high hardness material such as ceramics, and maintains high wear resistance.
この構成において、被粉砕原料１はミル中心軸と同軸に
配置した原料供給管２を経て回転テーブル３に落下供給
され、更に回転テーブル３の遠心力によりこの回転テー
ブル３の円周方向に設けた粉砕レース６と粉砕ローラ７
との噛み合いにより微粉砕れる。In this configuration, the raw material to be crushed 1 is dropped and supplied to the rotary table 3 via the raw material supply pipe 2 arranged coaxially with the center axis of the mill, and furthermore, due to the centrifugal force of the rotary table 3, a Grinding race 6 and grinding roller 7
It is finely pulverized by the meshing with the metal.
粉砕ローラ７はミルケーシング１３の外部に支持された
粉砕ローラシャフト９の先端に保持され、加圧状態で粉
砕ローラフの回転軸８を中心として回転し、前記被粉砕
原料を粉砕する。、粉砕生成された粉粒体は回転テーブ
ル３の外周に配設されたエアスロート１１から吹き上げ
る熱風１０によりミルケーシング上部へと気流搬送され
る。ミルケーシング１３内で浮遊状態となった粉粒体の
うち、粗大で重量の大きな粒子は重力により回転テーブ
ル３に落下して再粉砕される。この過程が一次分級であ
る。この−灰分綴部を通り抜けた粉粒体は複数枚の回転
分級羽根１６が回転分級ロータ１５に取り付けである回
転分級機に入り、所定の粒径以下の微粉はこの回転分級
機を貫通して製品微粉となる。一方所定の粒径よりも大
きな粗粒子は回転分級機の遠心送風作用によりミルケー
シング１３の半径方向においてその外周部に向かって吹
き飛ばされて回転テーブルに落下して再粉砕される。The crushing roller 7 is held at the tip of a crushing roller shaft 9 supported outside the mill casing 13, and rotates under pressure around the rotating shaft 8 of the crushing roller rough, thereby crushing the raw material to be crushed. The pulverized powder and granules are airflow-transported to the upper part of the mill casing by hot air 10 blown up from an air throat 11 disposed around the outer periphery of the rotary table 3. Among the powder particles suspended in the mill casing 13, coarse and heavy particles fall onto the rotary table 3 due to gravity and are re-pulverized. This process is primary classification. The powder and granules that have passed through this ash binding section enter a rotary classifier in which a plurality of rotary classification blades 16 are attached to a rotary classification rotor 15, and fine powder with a predetermined particle size or less passes through this rotary classifier. The product becomes a fine powder. On the other hand, coarse particles larger than a predetermined particle size are blown toward the outer circumference of the mill casing 13 in the radial direction by the centrifugal blowing action of the rotary classifier, fall onto the rotary table, and are re-pulverized.
以上の構成において第１図に示すミル内での粒子の飛行
軌跡（点線で示す）のように、回転分級機において分離
された粗粒子はフローガイド１７に受は止められて回転
テーブル３上に落下し、粉砕ローラ７と粉砕レース６と
から成る粉砕部へ戻され再粉砕される。ミルケーシング
内を落下する粗粒子は、その飛行経路がフローガイド１
７により規制・拘束されるためにエアスロート１１から
吹き上がって来る粒子群と干渉することは無く、従って
第７図に示すような粒子の滞留域は生じない、またエア
スロートから吹き上げ輸送される粉粒体は前記フローガ
イド１７の裏側を通って回転分級部に供給されるため干
渉は生じない。In the above configuration, as shown in the flight trajectory of particles in the mill (indicated by dotted lines) shown in FIG. It falls and is returned to the crushing section consisting of the crushing roller 7 and the crushing race 6 to be re-pulverized. The flight path of the coarse particles falling inside the mill casing is the flow guide 1.
Since the particles are regulated and restrained by the air throat 11, they do not interfere with the particles blowing up from the air throat 11, and therefore, the accumulation area of particles as shown in FIG. 7 does not occur, and the particles are blown up and transported from the air throat. Since the granular material is supplied to the rotary classification section through the back side of the flow guide 17, no interference occurs.
第３図は製品微粉を微粉炭として、その燃焼性を従来装
置の微粉炭と比較した結果を示す。FIG. 3 shows the results of comparing the combustibility of pulverized coal with that of a conventional device using pulverized coal as the product powder.
分級機回転数Ｎ（ｒｐｍ）に対する製品微粉粒度（２０
０メツシユパス量 ％）の変化を纏めたものである。Product fine particle size (20
This is a summary of changes in 0 mesh pass amount (%).
実験は石炭供給量１００ｋｇ／ｈの連続式テストミルを
用いて行った。従来型のミルでは分級機回転数が増加し
ても一定値以上では粒度の増加は頭打ちとなってしまい
、分級機の動力が無駄に消費されてしまう傾向がある。The experiment was conducted using a continuous test mill with a coal supply rate of 100 kg/h. In conventional mills, even if the rotational speed of the classifier increases, the increase in particle size reaches a ceiling above a certain value, and the power of the classifier tends to be wasted.
これは第７図に模式的に示すようにミルケーシング内の
粉砕部と分級部との中間位置において、下降する粒子群
の流れと上昇する粒子群の流れとが干渉し合い、この結
果粒子群の滞留部が生じて分級機能を妨げているためで
ある。これに対して本発明装置ではこのような滞留部が
生じないためミル回転数に対応して製品粒度が上昇・し
、装置の効率が大幅に上昇していることが分かる。また
従来装置においては粒度の増加が頭打ちになるのに対応
して第４図の如くミル差圧が上昇し、動力が無駄に消費
されていることが分かる。This is because, as schematically shown in Figure 7, the downward flow of particle groups and the upward flow of particle groups interfere with each other at an intermediate position between the crushing section and the classification section in the mill casing, resulting in particle groups. This is because a stagnation area is created, which impedes the classification function. On the other hand, in the apparatus of the present invention, such a stagnation part does not occur, so the product particle size increases in accordance with the mill rotation speed, and it can be seen that the efficiency of the apparatus is significantly increased. Furthermore, in the conventional apparatus, as the increase in particle size reaches a plateau, the mill differential pressure increases as shown in FIG. 4, and it can be seen that power is wasted.
第５図は給炭負荷（定格給炭量に対する比率 ％）の変
化と製品微粉炭の粒度との関係を示す。Figure 5 shows the relationship between the change in coal feeding load (ratio of rated coal feeding amount in %) and the particle size of the product pulverized coal.
この図において、本発明装置及び従来型装置の何れにお
いても給炭負荷の上昇に対応して微粉粒度は減少するが
、同一の給炭負荷で見ると本発明装置の方が製品微粉炭
の粒度がはるかに高く、特に低負荷時においてはその差
が拡大する。In this figure, in both the device of the present invention and the conventional device, the fine particle size decreases as the coal feeding load increases, but when looking at the same coal feeding load, the particle size of the product pulverized coal in the device of the present invention decreases. is much higher, and the difference widens especially at low loads.
第６図はバーナの負荷率に対する灰中未燃分率の変化を
示す。FIG. 6 shows the change in the unburned fraction in the ash with respect to the burner load factor.
従来形式のミルでは低負荷時および高負荷時において、
未燃分が増加するものの、本発明ミルでは負荷変動に係
わらず灰中未燃分が低いレベルで、かつほぼ一定値を保
持している。これは本発明装置においては、微粉粒度の
高いレベルでの制御によるところが大きい。With conventional mills, at low and high loads,
Although the unburned content increases, in the mill of the present invention, the unburned content in the ash remains at a low level and almost constant regardless of load fluctuations. This is largely due to the high level control of the fine powder particle size in the apparatus of the present invention.
第９図及び第１０図は第２の構成を示す。9 and 10 show the second configuration.
図中符号２１６はミルケーシング内壁に形成したポケッ
ト部であり、２１７はこのポケット部に連設した粗粒リ
ターンダクトである。このポケット部２１６及び粗粒リ
ターンダクト２１７は前述のフローガイドと同様粉砕ロ
ーラの上部に各々−基ずつ配置しである。また符号２１
９はこのポケット部２１６に対して蒸気等の気体を噴射
するするためのスプレィノズルであり、このノズル２１
９に対しては噴射媒体を供給する媒体供給ライン２２０
が接続している。 以上の構成において、分級機におい
て遠心力により外周部に吹き飛ばされた粗粒子は前記ポ
ケット部２１６に入り、そのポケット部内を下降する。In the figure, reference numeral 216 is a pocket formed on the inner wall of the mill casing, and 217 is a coarse grain return duct connected to this pocket. The pocket portion 216 and the coarse particle return duct 217 are arranged in pairs above the crushing roller, similar to the aforementioned flow guide. Also code 21
9 is a spray nozzle for injecting gas such as steam to this pocket portion 216, and this nozzle 21
9, a medium supply line 220 for supplying the injection medium;
is connected. In the above configuration, the coarse particles blown to the outer periphery by centrifugal force in the classifier enter the pocket portion 216 and descend within the pocket portion.
ポケット部に入った粗粒はその殆ど全部がポケット部内
を下降すため、再飛散の可能性は少なく非常に高い分級
効率を得ることができる。なお、ポケット部の形成高さ
、より具体的にはポケット部の上端部の位置は望ましく
は回転分級機における分級点、即ち回転分級機回転方向
に対する分級羽根高さの半分程度の位置に設定する。な
お、ポケット部に入った粗粒の再飛散防止をより徹底さ
せるため、ノズル２１９から少量の蒸気等の噴射媒体を
ポケット部内に噴射すれば再飛散は完全に防止できる。Since almost all of the coarse particles that have entered the pockets descend within the pockets, there is little possibility that they will be re-scattering, and a very high classification efficiency can be achieved. The formation height of the pocket part, more specifically, the position of the upper end of the pocket part is preferably set at the classification point of the rotary classifier, that is, about half the height of the classification blade with respect to the rotational direction of the rotary classifier. . In order to more thoroughly prevent the coarse particles that have entered the pocket from being re-scattering, re-scattering can be completely prevented by injecting a small amount of injection medium such as steam into the pocket from the nozzle 219.
第１３図は以上に示したポケット部２１６をケーンシン
グ内壁円周方向に沿って展開した状態を示す。FIG. 13 shows a state in which the pocket portion 216 described above is expanded along the circumferential direction of the inner wall of the casing.
第１１図は本発明装置のミルの粗粒分離ポケット１６内
で水スプレーを行うことによる粒度への影響を調べた結
果を示す、この結果から明らかなように水スプレーする
と同一給炭負荷比において製品粒度が向上、すなわち微
粒含有率が向上している。これは水スプレーを行うこと
により、粗粒子ポケット郡部における粗粒子の舞い上が
りを防止することができ、捕集した粒子を速やかに粉砕
部に戻すことが可能になった結果である。但しスプレー
量が多過ぎるとその水により粒子が凝集してリターンダ
クト１７に向かう粒子の粒子の流動を阻害するので、そ
の量は必要最小限度に止めるべきである。なお、水スプ
レーは粒子の減温効果もあり、高温揮発成分のミル内で
の発火を防止する作用も果たすことが期待できる。Figure 11 shows the results of investigating the effect of water spraying on grain size in the coarse grain separation pocket 16 of the mill of the present invention. The product particle size is improved, that is, the fines content is improved. This is because by spraying water, it is possible to prevent the coarse particles from flying up in the coarse particle pocket area, and it is now possible to quickly return the collected particles to the crushing section. However, if the amount of spray is too large, the particles will aggregate due to the water and the flow of particles toward the return duct 17 will be inhibited, so the amount should be kept to the minimum necessary amount. The water spray also has the effect of reducing the temperature of the particles, and can be expected to prevent high-temperature volatile components from igniting within the mill.
第１２図はこの第２の構成の装置と従来装置との性能を
、製品微粉である微粉炭を燃焼させることにより比較し
た試験結果を示すものであって、製品微粉燃焼時の排ガ
ス中の窒素酸化物（ＮＯｘ）量と排中未燃分との関係を
示す。Figure 12 shows the test results comparing the performance of the device with the second configuration and the conventional device by burning pulverized coal, which is the product powder. The relationship between the amount of oxides (NOx) and the unburned content in the exhaust is shown.
従来型のミルに比較して本発明ミルはＮＯｘ濃度と灰中
未燃分量は共に低い、これは粒度の向上によって保炎、
着火性が著しく向上したのと同時に、バーナ近傍火炎内
の高温還元域の形成が安定しており、ＮＯｘを安定なＮ
２に還元する中間生成物が活発に作り出されているため
である。Compared to conventional mills, the mill of the present invention has lower NOx concentrations and lower amounts of unburned matter in the ash.
At the same time, the ignitability has been significantly improved, and the formation of a high-temperature reduction zone in the flame near the burner is stable, converting NOx into stable N
This is because intermediate products that reduce to 2 are actively produced.
本発明は以上にその構成を具体的に説明したように、回
転型分級機の近傍に分離機能を有する板状物を配置する
ことにより、粗粒と微粒とを効率良く分離することが可
能となり、ローラミル全体としての粉砕分級効率を大幅
に向上させることが可能となる。As the configuration of the present invention has been specifically explained above, by arranging a plate-like object having a separation function near the rotary classifier, it is possible to efficiently separate coarse particles and fine particles. , it becomes possible to significantly improve the pulverization and classification efficiency of the roller mill as a whole.
第１図は本発明の実施例を示す竪型ローラミルの断面部
分図であって、第２図のＢ−Ｂ線による断面図、第２図
は第１図のＡ−Ａ線による視図、第３図は分級機回転数
と製品微粉粒度との関係を示すグラフ、第４図は分級機
回転数とミル差圧との関係を示すグラフ、第５図は給炭
負荷と製品微粉粒度との関係を示すグラフ、第６図はバ
ーナ負荷率と製品微粉炭燃焼時の灰中未燃分との関係を
示すグラフ、第７図は従来型ミルにおける粉砕粒子滞留
域を示すミル断面部分図、第８図は従来型ローラミルの
縦断面図、第９図は第２の構成を示すローラミル断面部
分図、第１０図は罵第９図のＢ−Ｂ線による視図、第１
１図は原料供給負荷比と製品比粒度との関係を示すグラ
フ、第１２図は製品微粉炭を燃焼させた際の灰中未燃分
とＮＯｘ濃度との関係を示すグラフ、第１３図は第２の
構成をミルケーシング円周方向に展開した状態を示す展
開図である。
１・・・被粉砕原料 １３・・・ミルケーシング６・
・・粉砕レース ７・・・粉砕ローラ１５・・・回転
分級機ロータ
１６・・・回転分級羽根 １７・・・フローガイド
６・・・粗粒子分離ボケッ
・粗粒子リターンダクト
・スプレィノズル
・スプレィ媒体供給ライン
第１図
第２図
りニー〉
第３
図
＋き及礎回牽ム政Ｎ
（ｒｐｍ）
第５図
ＯＯ
Ｊヨ古ノシＬ−即１ａｙ （％）
第４
図
今烈＋蚊口転吏支Ｎ
（ｒｌンｍ）
第６図
ミル（Ｋ寸）の負骨牽
ｃ％ノ
第
７図
一回転方句
第９図
第８図
第１Ｏ図
第１Ｉ図
イ１岬士＋イ芸９ り 智、仁ヒ―Ｃ％ノ第１２図
戻中禾太在゛ブト （％）FIG. 1 is a partial cross-sectional view of a vertical roller mill showing an embodiment of the present invention, and is a cross-sectional view taken along the line B-B in FIG. 2, and FIG. 2 is a perspective view taken along the line A-A in FIG. Figure 3 is a graph showing the relationship between classifier rotation speed and product fine particle size, Figure 4 is a graph showing the relationship between classifier rotation speed and mill differential pressure, and Figure 5 is a graph showing the relationship between coal feeding load and product fine particle size. Figure 6 is a graph showing the relationship between burner load factor and unburned content in the ash during combustion of product pulverized coal. Figure 7 is a partial mill cross-sectional view showing the pulverized particle retention area in a conventional mill. , FIG. 8 is a vertical cross-sectional view of a conventional roller mill, FIG. 9 is a partial cross-sectional view of a roller mill showing a second configuration, FIG. 10 is a perspective view taken along line B-B in FIG.
Figure 1 is a graph showing the relationship between raw material supply load ratio and product particle size, Figure 12 is a graph showing the relationship between unburned content in ash and NOx concentration when product pulverized coal is burned, and Figure 13 is FIG. 7 is a developed view showing a state in which the second configuration is developed in the circumferential direction of the mill casing. 1... Raw material to be crushed 13... Mill casing 6.
...Crushing race 7...Crushing roller 15...Rotary classifier rotor 16...Rotating classification vane 17...Flow guide 6...Coarse particle separation bucket・Coarse particle return duct・Spray nozzle・Spray medium Supply line Fig. 1 Fig. 2 Fig. Knee〉 Fig. 3 Fig. 3 + Foundation turning system N (rpm) Fig. 5 OO J Yokoronoshi L - Soku 1ay (%) Fig. 4 Fig. Konretsu + Mosquito mouth transfer Support N (rlnm) Figure 6 Mill (K dimension) negative bone tension c% Figure 7 One rotation phrase Figure 9 Figure 8 Figure 1O Figure 1I Figure A1 Misaki + I Gei9 Figure 12 of Satoshi, Jinhi-C% is back (%)
Claims (3)
る分級部において分級する粉砕分級装置において、分級
部近傍のミルケーシング内壁円周方向に対して、分級し
た粗粒を粉砕部の中心方向に供給するようガイド部を形
成したフローガイドを一以上配置したことを特徴とする
粉砕分級装置。(1) In a crushing and classifying device in which the pulverized particles pulverized in the pulverizing section are classified in the classification section having rotating blades, the classified coarse particles are placed at the center of the pulverizing section in the circumferential direction of the inner wall of the mill casing near the classification section. A pulverizing and classifying device characterized by having one or more flow guides each having a guide portion formed therein so as to supply the fluid in the same direction.
て、ポケット部とこれに連設する粗粒リターンダクトと
を１以上設け、分離した粗粒の再飛散を防止すよう構成
したことを特徴とする粉砕分級装置。(2) One or more pockets and one or more coarse grain return ducts connected to the pockets are provided in the circumferential direction of the inner wall of the mill casing near the classification section to prevent the separated coarse grains from being re-scattering. Characteristic crushing and classification equipment.
を噴射するノズルを配置したことを特徴とする特許請求
の範囲第（２）項記載の粉砕分級装置。(3) The crushing and classifying device according to claim (2), further comprising a nozzle that injects a re-entrainment prevention medium such as steam to the pocket portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17372688A JPH0226651A (en) | 1988-07-14 | 1988-07-14 | Crushed material sorting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17372688A JPH0226651A (en) | 1988-07-14 | 1988-07-14 | Crushed material sorting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0226651A true JPH0226651A (en) | 1990-01-29 |
Family
ID=15966005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17372688A Pending JPH0226651A (en) | 1988-07-14 | 1988-07-14 | Crushed material sorting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226651A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009297657A (en) * | 2008-06-13 | 2009-12-24 | Ihi Corp | Vertical-type crushing apparatus |
| JP2016083638A (en) * | 2014-10-29 | 2016-05-19 | 株式会社Ihi | Vertical roller mill |
| JP2016087544A (en) * | 2014-11-04 | 2016-05-23 | 株式会社Ihi | Vertical roller mill |
| JP2016101557A (en) * | 2014-11-28 | 2016-06-02 | 三菱日立パワーシステムズ株式会社 | Vertical type roller mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156440A (en) * | 1983-02-25 | 1984-09-05 | 宇部興産株式会社 | Vertical roller mill |
| JPS6064643A (en) * | 1983-09-20 | 1985-04-13 | 住友セメント株式会社 | Vertical mill with rotary classifier |
| JPS6342746A (en) * | 1986-08-06 | 1988-02-23 | 株式会社神戸製鋼所 | Air stream guide apparatus of roller mill |
| JPS6316845B2 (en) * | 1983-09-28 | 1988-04-11 | Hitachi Shomei Kk | |
| JPS63116749A (en) * | 1986-10-31 | 1988-05-21 | 宇部興産株式会社 | Vertical type crusher |
-
1988
- 1988-07-14 JP JP17372688A patent/JPH0226651A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156440A (en) * | 1983-02-25 | 1984-09-05 | 宇部興産株式会社 | Vertical roller mill |
| JPS6064643A (en) * | 1983-09-20 | 1985-04-13 | 住友セメント株式会社 | Vertical mill with rotary classifier |
| JPS6316845B2 (en) * | 1983-09-28 | 1988-04-11 | Hitachi Shomei Kk | |
| JPS6342746A (en) * | 1986-08-06 | 1988-02-23 | 株式会社神戸製鋼所 | Air stream guide apparatus of roller mill |
| JPS63116749A (en) * | 1986-10-31 | 1988-05-21 | 宇部興産株式会社 | Vertical type crusher |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009297657A (en) * | 2008-06-13 | 2009-12-24 | Ihi Corp | Vertical-type crushing apparatus |
| JP2016083638A (en) * | 2014-10-29 | 2016-05-19 | 株式会社Ihi | Vertical roller mill |
| JP2016087544A (en) * | 2014-11-04 | 2016-05-23 | 株式会社Ihi | Vertical roller mill |
| JP2016101557A (en) * | 2014-11-28 | 2016-06-02 | 三菱日立パワーシステムズ株式会社 | Vertical type roller mill |
| US10722899B2 (en) | 2014-11-28 | 2020-07-28 | Mitsubishi Hitachi Power Systems, Ltd. | Vertical roller mill |
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