JP2012217920A - Vertical mill - Google Patents

Vertical mill Download PDF

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JP2012217920A
JP2012217920A JP2011085997A JP2011085997A JP2012217920A JP 2012217920 A JP2012217920 A JP 2012217920A JP 2011085997 A JP2011085997 A JP 2011085997A JP 2011085997 A JP2011085997 A JP 2011085997A JP 2012217920 A JP2012217920 A JP 2012217920A
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cylindrical
pulverized coal
speed increasing
flow
primary air
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Takahiro Shimada
貴弘 島田
Satoshi Ohashi
聡 大橋
Shusaku Yamazaki
秀作 山崎
Yoshiyuki Yamane
善行 山根
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Ihi Corp
株式会社Ihi
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PROBLEM TO BE SOLVED: To provide a vertical mill achieving the enhancement of classification efficiency by increasing the flow velocity of the primary air rising through a classification chamber while revolving to increase the centrifugal force acting on an object to be ground.SOLUTION: The vertical mill includes a housing 2, which is constituted of a cylindrical grinding part 3, a truncated cone-shaped speed increasing part 4 upwardly extending from the upper end of the grinding part to upwardly reduce in diameter and a rectification part 5 upwardly extending from the upper end of the cone-shaped speed increasing part 4, and which forms a classification chamber 12; a classifier 21 provided to the rectification part; a grinding table 7 provided to the lower part of the grinding part; and pressure rollers 9 pressed to the grinding table and grinding a lumpy substance, wherein primary air is ejected from the periphery of the grinding table so as to revolve in the classification chamber.

Description

本発明は、石炭、石灰岩等の塊状物を微粉に粉砕する竪型ミルに関するものである。   The present invention relates to a vertical mill that pulverizes lumps such as coal and limestone into fine powder.
石炭を燃料とする石炭焚きボイラでは、塊状の石炭を竪型ミルにより粉砕して微粉炭とし、微粉炭を1次空気と共に燃焼装置であるバーナに供給している。   In a coal-fired boiler using coal as fuel, massive coal is pulverized by a vertical mill into pulverized coal, and the pulverized coal is supplied together with primary air to a burner that is a combustion apparatus.
竪型ミルは、ハウジングと、ハウジングの上部に収納され所定の回転数で回転する回転式の分級機と、ハウジングの下部に収納され所定の回転数で回転する粉砕テーブルと、ハウジングに支持された加圧ローラユニットとを有し、加圧ローラユニットは回転自在な加圧ローラを粉砕テーブルに押圧する構造となっている。   The vertical mill is supported by the housing, a rotary classifier that is housed in the upper part of the housing and rotates at a predetermined rotational speed, a grinding table that is housed in the lower part of the housing and rotates at the predetermined rotational speed, and the housing. A pressure roller unit, and the pressure roller unit is configured to press a rotatable pressure roller against the crushing table.
粉砕テーブルにはシュートから塊状の石炭が粉砕テーブルの中心に投入され、供給される。供給された塊状の石炭は、粉砕テーブルの回転遠心力によって外周へと移動し、石炭が粉砕テーブルの外周に移動する過程で、加圧ローラと粉砕テーブルの間に噛込まれて粉砕される。粉砕された粉砕炭は粉砕テーブル周囲の1次空気吹出し口より吹上がる1次空気によって旋回しながら上昇する。   A lump of coal is fed from the chute to the center of the crushing table and supplied to the crushing table. The supplied massive coal moves to the outer periphery by the rotational centrifugal force of the pulverizing table, and is pulverized by being caught between the pressure roller and the pulverizing table in the process of moving the coal to the outer periphery of the pulverizing table. The pulverized pulverized coal rises while swirling by the primary air blown up from the primary air outlet around the pulverization table.
粉砕炭が上昇する過程で、粉砕炭には旋回の遠心力による遠心分級が行われると共に、自重による重力が作用する重力分級が行われる。粉砕炭の内、粒径の大きい粗粉炭に作用する遠心力及び重力が大きいことから、粗粉炭は1次空気の上昇流より分離し、粉砕テーブル上に落下する。   In the process of raising the pulverized coal, centrifugal classification is performed on the pulverized coal by a centrifugal force of rotation, and gravity classification in which gravity by its own weight acts is performed. Among the pulverized coal, the centrifugal force and the gravity acting on the coarse pulverized coal having a large particle size are large, so that the pulverized coal is separated from the rising flow of the primary air and falls on the pulverization table.
遠心分級及び重力分級により分級された後の粉砕炭は、ハウジング上部の分級機により衝突分級が行われ、更に粗粉炭が粉砕炭から分離されることで、粒径の小さい微粉炭が1次空気と共にバーナに供給される。   The pulverized coal after classification by centrifugal classification and gravity classification is subjected to collision classification by a classifier at the upper part of the housing, and further, the coarse pulverized coal is separated from the pulverized coal, so that the pulverized coal with a small particle size is primary air. And supplied to the burner.
従来の竪型ミルの場合、1次空気の旋回流はハウジングを上昇するのに伴い、次第に弱くなっていく為、遠心分級の効果を充分に発揮することができなかった。   In the case of a conventional vertical mill, the swirling flow of the primary air gradually weakens as the housing moves up, so that the centrifugal classification effect cannot be fully exhibited.
尚、各側壁に囲まれた容器内部の断面積が、下部から上部に向って減少する様にしたことで、容器内部へ流入する熱空気量を低減しても十分な吹上げ流速を得ることができる竪型ローラミルとして、特許文献1に示されるものがある。   In addition, since the cross-sectional area inside the container surrounded by each side wall decreases from the lower part toward the upper part, a sufficient blowing flow rate can be obtained even if the amount of hot air flowing into the container is reduced. As a vertical roller mill that can perform the above, there is one disclosed in Patent Document 1.
特開2000−93820号公報JP 2000-93820 A
本発明は斯かる実情に鑑み、分級室を旋回しながら上昇する1次空気の流速を増大させ、粉砕物に作用する遠心力を増大させることで、分級効率の向上を図る竪型ミルを提供するものである。   In view of such circumstances, the present invention provides a vertical mill that improves the classification efficiency by increasing the flow velocity of primary air that rises while swirling the classification chamber and increasing the centrifugal force that acts on the pulverized product. To do.
本発明は、円筒状の粉砕部と、該粉砕部の上端より上方に延出し上方に向って縮径する円錐台形状の増速部と、該増速部の上端より上方に延出する整流部とで構成され、分級室を形成するハウジングと、前記整流部に設けられた分級機と、前記粉砕部の下部に設けられた粉砕テーブルと、該粉砕テーブルに押圧され、塊状物を粉砕する加圧ローラと、前記粉砕テーブルの周囲より前記分級室内を旋回する様1次空気を噴出する竪型ミルに係るものである。   The present invention relates to a cylindrical pulverizing part, a truncated cone-shaped speed increasing part extending upward from the upper end of the pulverizing part, and a rectification extending upward from the upper end of the speed increasing part. And a classifier provided in the rectifying unit, a crushing table provided in a lower part of the crushing unit, and pressed by the crushing table to crush the lump. The present invention relates to a vertical roller that ejects primary air from the periphery of the pressure roller and the grinding table so as to swirl in the classification chamber.
又本発明は、前記整流部は、前記増速部の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部と、該倒立円錐台部の上端より上方に向って延出する円筒形状の大円筒部と、該大円筒部の上端より上方に延出し上方に向って縮径する円錐台形状の2次増速部と、該2次増速部の上端より上方に向って延出する円筒形状の小円筒部とからなり、前記分級機は前記小円筒部に設けられた竪型ミルに係るものである。   Further, according to the present invention, the rectifying unit has an inverted truncated cone shape that extends upward from the upper end of the speed increasing portion and expands upward, and is directed upward from the upper end of the inverted truncated cone portion. A cylindrical large cylindrical portion extending from the upper end of the large cylindrical portion; a truncated cone-shaped secondary speed increasing portion extending upward from the upper end of the large cylindrical portion; and an upper end of the secondary speed increasing portion The classifier includes a vertical mill provided on the small cylindrical portion. The small classifier includes a cylindrical small cylindrical portion extending upward.
又本発明は、前記大円筒部は、周面より接線方向に補助1次空気を噴出し、旋回流を増速する補助1次空気供給口を更に具備する竪型ミルに係るものである。   Further, the present invention relates to a vertical mill in which the large cylindrical portion further includes an auxiliary primary air supply port for jetting auxiliary primary air in a tangential direction from the peripheral surface to increase the swirling flow.
又本発明は、前記整流部が、前記増速部の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部と、該倒立円錐台部の上端より上方に向って延出する円筒形状の円筒部とからなり、前記分級機は前記円筒部に設けられた竪型ミルに係るものである。   Further, according to the present invention, the rectifying portion extends upward from the upper end of the speed increasing portion and has an inverted truncated conical shape with a diameter increasing upward, and is directed upward from the upper end of the inverted truncated conical portion. The classifier is related to a vertical mill provided in the cylindrical portion.
更に又本発明は、前記整流部が、円筒形状である竪型ミルに係るものである。   Furthermore, the present invention relates to a vertical mill in which the rectifying portion has a cylindrical shape.
本発明によれば、円筒状の粉砕部と、該粉砕部の上端より上方に延出し上方に向って縮径する円錐台形状の増速部と、該増速部の上端より上方に延出する整流部とで構成され、分級室を形成するハウジングと、前記整流部に設けられた分級機と、前記粉砕部の下部に設けられた粉砕テーブルと、該粉砕テーブルに押圧され、塊状物を粉砕する加圧ローラと、前記粉砕テーブルの周囲より前記分級室内を旋回する様1次空気を噴出する吹出し口とを具備するので、1次空気が前記分級室内を上昇する過程で、前記増速部の縮径に伴い1次空気の流速が増大し、1次空気に運ばれる粉砕された塊状物に作用する遠心力が増大する為、増大した遠心力により粒径の大きい塊状物を1次空気の上昇流からより多く分離させることができ、分級性能の向上を図ることができるという優れた効果を発揮する。   According to the present invention, a cylindrical pulverizing part, a truncated cone-shaped speed increasing part extending upward from the upper end of the pulverizing part, and extending upward from the upper end of the speed increasing part. A rectifying unit configured to form a classification chamber, a classifier provided in the rectifying unit, a pulverizing table provided below the pulverizing unit, and pressed by the pulverizing table, A pressure roller for pulverization and a blow-out port for ejecting primary air from the periphery of the pulverization table so as to swirl in the classification chamber. The primary air flow rate increases with the diameter reduction of the part, and the centrifugal force acting on the crushed lump conveyed to the primary air increases. It can be separated from the upward flow of air more, improving the classification performance. Possible to exhibit an excellent effect that it is.
本発明の第1の実施例に係る竪型ミルの概略立断面図である。1 is a schematic sectional elevation view of a vertical mill according to a first embodiment of the present invention. 本発明の第2の実施例に係る竪型ミルの概略立断面図である。It is a schematic sectional elevation view of a vertical mill according to a second embodiment of the present invention. 本発明の第3の実施例に係る竪型ミルの概略立断面図である。It is a schematic sectional elevation of a vertical mill according to a third embodiment of the present invention. 本発明の第4の実施例に係る竪型ミルの概略立断面図である。It is a schematic elevation sectional drawing of the vertical mill which concerns on the 4th Example of this invention.
以下、図面を参照しつつ本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.
先ず、図1に於いて、本発明の第1の実施例について説明する。   First, referring to FIG. 1, a first embodiment of the present invention will be described.
図1中、1は竪型ミルであり、該竪型ミル1は図示しない基台に立設されたハウジング2を有し、該ハウジング2は内部に密閉された空間を形成する。又、該ハウジング2は円筒形状の粉砕部3と、該粉砕部3の上端より上方に延出し上方に向って縮径する円錐台形状の増速部4と、該増速部4の上端より上方に延出する円筒形状の整流部5とで構成される。   In FIG. 1, 1 is a vertical mill, and the vertical mill 1 has a housing 2 erected on a base (not shown), and the housing 2 forms a sealed space inside. The housing 2 includes a cylindrical crushing portion 3, a frustoconical speed increasing portion 4 extending upward from the upper end of the crushing portion 3 and reducing in diameter upward, and an upper end of the speed increasing portion 4. It is comprised with the cylindrical rectification | straightening part 5 extended upwards.
前記ハウジング2の下方にはテーブル駆動装置(図示せず)が設けられ、該テーブル駆動装置には前記ハウジング2を下方から前記粉砕部3の下部迄垂直に貫通する駆動軸6が連結されている。該駆動軸6の上端には粉砕テーブル7が設けられており、該粉砕テーブル7は前記駆動軸6を介して前記テーブル駆動装置によって定速又は可変速で回転される。   A table drive device (not shown) is provided below the housing 2, and a drive shaft 6 that passes through the housing 2 vertically from the lower portion to the lower portion of the crushing unit 3 is connected to the table drive device. . A crushing table 7 is provided at the upper end of the drive shaft 6, and the crushing table 7 is rotated at a constant speed or a variable speed by the table driving device via the drive shaft 6.
前記粉砕テーブル7の上面には、凹溝8が前記粉砕テーブル7の中心と同心円に形成され、前記粉砕テーブル7の回転中心から放射状に所要組数、例えば120°間隔で3組の加圧ローラ9が傾動自在に設けられている。該加圧ローラ9は、アクチュエータ、例えば図示しない油圧シリンダ等により前記凹溝8に押圧される様になっている。   A concave groove 8 is formed concentrically with the center of the pulverizing table 7 on the upper surface of the pulverizing table 7, and a required number of sets, for example, three sets of pressure rollers at intervals of 120 ° are formed radially from the rotation center of the pulverizing table 7. 9 is tiltably provided. The pressure roller 9 is pressed against the concave groove 8 by an actuator such as a hydraulic cylinder (not shown).
前記ハウジング2内部の前記粉砕テーブル7の下方には1次空気室11が形成され、前記粉砕テーブル7より上方は、分級室12となっている。又、該分級室12は、前記粉砕部3の内部に形成される粉砕室13、前記増速部4の内部に形成される増速室14、前記整流部5の内部に形成される整流室15からなっている。尚、前記増速室14は、1次遠心分級を行う1次遠心分級部として作用する。   A primary air chamber 11 is formed below the grinding table 7 in the housing 2, and a classification chamber 12 is located above the grinding table 7. The classification chamber 12 includes a crushing chamber 13 formed inside the crushing unit 3, a speed increasing chamber 14 formed inside the speed increasing unit 4, and a rectifying chamber formed inside the rectifying unit 5. It consists of 15. The speed increasing chamber 14 functions as a primary centrifugal classifying unit that performs primary centrifugal classification.
前記ハウジング2の下部には1次空気供給口16が取付けられ、該1次空気供給口16は図示しない送風機に接続されると共に、前記1次空気室11に連通している。前記粉砕テーブル7の周囲には、周方向に傾斜した1次空気の吹出し口17が全周に設けられている。   A primary air supply port 16 is attached to the lower portion of the housing 2, and the primary air supply port 16 is connected to a blower (not shown) and communicates with the primary air chamber 11. Around the pulverizing table 7, primary air outlets 17 inclined in the circumferential direction are provided on the entire circumference.
前記ハウジング2の上側には原料給排部(図示せず)が設けられ、該原料給排部はパイプ状のシュート18を有している。該シュート18は前記ハウジング2の内部の前記粉砕室13迄延出し、下端が前記粉砕テーブル7の中央上方に位置している。前記シュート18には塊状の石炭が供給され、供給された石炭は前記粉砕テーブル7の中心部に落下する様になっている。   A raw material supply / discharge portion (not shown) is provided above the housing 2, and the raw material supply / discharge portion has a pipe-like chute 18. The chute 18 extends to the crushing chamber 13 inside the housing 2, and the lower end is positioned above the center of the crushing table 7. Bulk coal is supplied to the chute 18, and the supplied coal falls to the center of the crushing table 7.
又、前記整流室15には、ブレード19を有する分級機21が前記シュート18に対して回転自在に設けられ、前記分級機21は分級機駆動装置(図示せず)によって回転される。前記ブレード19は短冊状であり、倒立円錐曲面上に円周方向に所定角度ピッチで所定枚数、例えば20枚〜60枚配設される。又、前記ブレード19は下端から上端に向って前記整流室15の中心から離反する様に傾斜している。   The rectifying chamber 15 is provided with a classifier 21 having a blade 19 so as to be rotatable with respect to the chute 18. The classifier 21 is rotated by a classifier driving device (not shown). The blades 19 are in the shape of strips, and a predetermined number, for example, 20 to 60, is disposed on the inverted conical curved surface at a predetermined angular pitch in the circumferential direction. The blade 19 is inclined from the lower end toward the upper end so as to be separated from the center of the rectifying chamber 15.
前記原料給排部には、粉砕された微粉炭を送給する微粉炭送給管22が接続されており、該微粉炭送給管22はボイラのバーナ(図示せず)に接続されている。   A pulverized coal feed pipe 22 for feeding the pulverized pulverized coal is connected to the raw material supply / discharge section, and the pulverized coal feed pipe 22 is connected to a burner (not shown) of a boiler. .
次に、前記竪型ミル1に於ける石炭の粉砕について説明する。   Next, the pulverization of coal in the vertical mill 1 will be described.
前記粉砕テーブル7が、前記駆動軸6を介してテーブル駆動装置(図示せず)によって回転され、前記1次空気供給口16より200℃前後の1次空気が前記1次空気室11に導入された状態で、前記シュート18より塊状の石炭が投入される。塊状の石炭は、前記シュート18の下端より前記粉砕テーブル7の中心部に流落し、該粉砕テーブル7上に供給される。   The crushing table 7 is rotated by a table driving device (not shown) via the drive shaft 6, and primary air at around 200 ° C. is introduced into the primary air chamber 11 from the primary air supply port 16. In this state, lump coal is introduced from the chute 18. The lump coal flows down from the lower end of the chute 18 to the center of the crushing table 7 and is supplied onto the crushing table 7.
該粉砕テーブル7上の石炭は、該粉砕テーブル7の回転による遠心力で外周方向に移動し、前記加圧ローラ9に噛込まれて粒径の大きい粗粉炭と粒径の小さい微粉炭からなる粉砕炭に粉砕され、更に遠心力によって外周に移動する。   The coal on the crushing table 7 is moved in the outer peripheral direction by the centrifugal force generated by the rotation of the crushing table 7, and is caught by the pressure roller 9 and consists of coarse coal with a large particle size and pulverized coal with a small particle size. It is pulverized into pulverized charcoal and further moved to the outer periphery by centrifugal force.
前記1次空気供給口16より前記1次空気室11に導入された1次空気が、前記粉砕テーブル7の前記吹出し口17より吹上がり、遠心力によって前記凹溝8を乗越えた粉砕炭は、前記吹出し口17から吹上がった1次空気に乗り、粉砕炭流23として前記分級室12の外周部を前記粉砕部3の内壁面に沿って旋回しながら上昇する。   The primary air introduced into the primary air chamber 11 from the primary air supply port 16 blows up from the outlet 17 of the pulverizing table 7, and the pulverized coal that has climbed over the concave groove 8 by centrifugal force is: It rides on the primary air blown up from the outlet 17, and rises as a pulverized coal flow 23 while turning the outer peripheral portion of the classification chamber 12 along the inner wall surface of the pulverization unit 3.
尚、粉砕炭流23の旋回流速は、旋回流の直径の2乗に反比例する。又、遠心力は旋回流速の2乗に比例(直径の4乗に反比例)し、旋回流の回転半径(直径)の1乗に反比例する。従って、粉砕炭流23に作用する遠心力は、旋回流の直径の5乗に反比例する。一方、旋回流や上昇流による抗力は、流速の2乗に比例(直径の4乗に反比例)する様になっている。   Note that the swirl flow velocity of the pulverized coal flow 23 is inversely proportional to the square of the diameter of the swirl flow. The centrifugal force is proportional to the square of the swirl flow velocity (inversely proportional to the fourth power of the diameter), and inversely proportional to the first power of the rotational radius (diameter) of the swirl flow. Accordingly, the centrifugal force acting on the pulverized coal flow 23 is inversely proportional to the fifth power of the diameter of the swirling flow. On the other hand, the drag force caused by the swirling flow and the upward flow is proportional to the square of the flow velocity (inversely proportional to the fourth power of the diameter).
粉砕炭流23には、先ず前記粉砕室13の外周を上昇する過程で、1次空気の旋回による遠心力が作用し遠心分級が行われると共に、粉砕炭の自重による重力が作用し重力分級が行われる。この時、粒径の大きい粗粉炭に対して大きい遠心力及び重力が作用する為、粗粉炭のみが粉砕炭流23から径方向に分離され、前記粉砕部3の内壁に飛ばされると共に、重力方向に分離され、前記粉砕テーブル7上に落下する。   In the course of ascending the outer periphery of the pulverizing chamber 13, the pulverized coal flow 23 is subjected to centrifugal classification due to the swirling of the primary air, and centrifugal classification is performed. Done. At this time, since a large centrifugal force and gravity act on the coarse pulverized coal having a large particle size, only the coarse pulverized coal is separated in the radial direction from the pulverized coal flow 23 and is blown to the inner wall of the pulverized portion 3, and the direction of gravity And fall on the crushing table 7.
前記粉砕室13を上昇する粉砕炭流23は、次いで上方に向って縮径する前記増速室14を旋回しながら上昇する。   The pulverized coal flow 23 rising in the pulverizing chamber 13 then moves upward while turning around the speed increasing chamber 14 whose diameter is reduced upward.
前述した様に、粉砕炭流23の流速は旋回流の直径の2乗に反比例し、粉砕炭流23に作用する遠心力は旋回流の直径の5乗に反比例する為、粉砕炭流23が前記増速室14を上昇し、該増速室14の径が縮小されるのに伴い、粉砕炭流23の旋回流の回転半径が減少し、流速が増大すると共に、粉砕炭流23の中の粉砕炭に作用する遠心力が大きくなる。尚、旋回流の回転半径は漸次減少するので、縮径する際の旋回流の圧損の増大を抑制できる。   As described above, the flow velocity of the pulverized coal flow 23 is inversely proportional to the square of the diameter of the swirling flow, and the centrifugal force acting on the pulverized coal flow 23 is inversely proportional to the fifth power of the diameter of the swirling flow. As the speed increasing chamber 14 is raised and the diameter of the speed increasing chamber 14 is reduced, the rotational radius of the swirling flow of the pulverized coal flow 23 decreases, the flow velocity increases, The centrifugal force acting on the pulverized coal becomes larger. In addition, since the rotational radius of the swirl flow gradually decreases, an increase in swirl flow pressure loss when the diameter is reduced can be suppressed.
従って、前記増速室14では、粉砕炭流23に対する遠心分級の効果が大きくなるので、前記粉砕室13に於いて遠心分級及び重力分級で分離できなかった粗粉炭を、遠心力により粉砕炭流23から径方向に分離させることができる。   Accordingly, in the speed increasing chamber 14, the effect of centrifugal classification on the pulverized coal flow 23 is increased. Therefore, the coarse pulverized coal that could not be separated in the pulverization chamber 13 by centrifugal classification and gravity classification is crushed by the centrifugal force. 23 can be separated in the radial direction.
又、前記増速室14は円錐台形状となっているので、粉砕炭流23から分離され、前記増速室14の内壁に衝突した粗粉炭は、下方向への反力を受け、容易に下方へと落下する。   Further, since the speed increasing chamber 14 has a truncated cone shape, the pulverized coal separated from the pulverized coal flow 23 and colliding with the inner wall of the speed increasing chamber 14 receives a reaction force in the downward direction and is easily Fall down.
前記増速室14を上昇した粉砕炭流23は、次いで前記整流室15を上昇する。該整流室15では、縮径しながら旋回していた粉砕炭流23が、前記整流部5の内壁に沿って再度上昇方向が垂直な旋回流へと整流され、整流された粉砕炭流23が前記分級機21に流入し、衝突分級が行われる。   The pulverized coal flow 23 that has moved up the speed increasing chamber 14 then moves up the rectifying chamber 15. In the rectifying chamber 15, the pulverized coal stream 23 swirling while being reduced in diameter is rectified again into a swirling flow whose ascending direction is vertical along the inner wall of the rectifying unit 5. It flows into the classifier 21 and collision classification is performed.
該分級機21に流入した粉砕炭流23は、前記ブレード19を横切る際に、所定粒径以上の粗粉炭が前記ブレード19によって弾かれ、前記粉砕テーブル7上に落下する。又、前記ブレード19を通過した所定粒径以下の微粉炭は、前記微粉炭送給管22より送出され、図示しないボイラのバーナに供給される。   When the pulverized coal flow 23 flowing into the classifier 21 crosses the blade 19, coarse coal having a predetermined particle size or more is repelled by the blade 19 and falls onto the pulverization table 7. The pulverized coal having a predetermined particle size or less that has passed through the blade 19 is fed from the pulverized coal feed pipe 22 and supplied to a burner of a boiler (not shown).
重力分級、遠心分級、衝突分級によって分級され、前記粉砕テーブル7上に落下した粗粉炭は、該粉砕テーブル7の回転遠心力によって前記凹溝8迄移動し、前記加圧ローラ9によって再度粉砕され、前記分級室12を上昇し、前記分級機21に流入する過程で再度重力分級、遠心分級、衝突分級により分級が行われる。   Coarse coal that has been classified by gravity classification, centrifugal classification, and collision classification and dropped onto the pulverizing table 7 moves to the concave groove 8 by the rotational centrifugal force of the pulverizing table 7 and is pulverized again by the pressure roller 9. In the process of ascending the classification chamber 12 and flowing into the classifier 21, classification is performed again by gravity classification, centrifugal classification, and collision classification.
上述の様に、第1の実施例では、前記ハウジング2に上方に向って縮径する円錐台形状の前記増速部4を設け、前記分級室12内を上昇する粉砕炭流23の旋回速度を増大させ、粉砕炭流23に作用する遠心力が大きくなる様にしたので、遠心分級の効果が増大し、前記竪型ミル1に於ける分級性能を向上させることができる。   As described above, in the first embodiment, the speed increasing portion 4 having a truncated cone shape with a diameter decreasing upward is provided in the housing 2, and the swirling speed of the pulverized coal flow 23 rising in the classification chamber 12. Since the centrifugal force acting on the pulverized coal flow 23 is increased, the effect of centrifugal classification is increased, and the classification performance in the vertical mill 1 can be improved.
又、前記増速部4の上端より延出する円筒形状の前記整流部5を設け、粉砕炭流23が前記整流部5の内壁に沿って旋回しながら垂直方向に上昇する様整流したので、粉砕炭流23が縮径しながら前記分級機21の一部に集中して流入するのを防止することができ、該分級機21に流入する粉砕炭流23の流量分布の均一化を図り分級性能を向上させることができる。   In addition, since the cylindrical rectifying unit 5 extending from the upper end of the speed increasing unit 4 is provided and rectified so that the pulverized coal flow 23 rises in the vertical direction while turning along the inner wall of the rectifying unit 5, The pulverized coal stream 23 can be prevented from concentrating and flowing into a part of the classifier 21 while being reduced in diameter, and the flow distribution of the pulverized coal stream 23 flowing into the classifier 21 is made uniform and classified. Performance can be improved.
更に、第1の実施例では、前記粉砕部3よりも径の小さい前記整流部5に前記分級機21を設けるので、該分級機21を小型化することができ、コストの低減を図ることができる。   Furthermore, in the first embodiment, since the classifier 21 is provided in the rectifying unit 5 having a diameter smaller than that of the pulverizing unit 3, the classifier 21 can be miniaturized and the cost can be reduced. it can.
次に、図2に於いて、本発明の第2の実施例について説明する。尚、図2中、図1中と同等のものには同符号を付し、その説明を省略する。   Next, referring to FIG. 2, a second embodiment of the present invention will be described. 2 that are the same as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
第2の実施例では、ハウジング2が粉砕部3と増速部4と整流部24とによって構成されている。該整流部24は、増速部4の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部25と、該倒立円錐台部25の上端より上方に向って延出する円筒形状の円筒部26により構成され、前記整流部24の内部に整流室27が形成される。   In the second embodiment, the housing 2 is constituted by a pulverizing part 3, a speed increasing part 4, and a rectifying part 24. The rectifying unit 24 extends upward from the upper end of the speed increasing unit 4 and extends upward from the upper end of the inverted frustoconical portion 25. A rectifying chamber 27 is formed inside the rectifying unit 24.
尚、分級機21は、前記整流室27の上部、即ち前記円筒部26に同心に収納される。   The classifier 21 is housed concentrically in the upper part of the rectifying chamber 27, that is, in the cylindrical part 26.
シュート18より投入され、加圧ローラ9により粉砕された粉砕炭は、1次空気に吹上げられて粉砕炭流23として分級室12内の外周部を旋回しながら上昇する。   The pulverized coal introduced from the chute 18 and pulverized by the pressure roller 9 is blown up to the primary air and ascends as the pulverized coal flow 23 turns around the outer periphery of the classification chamber 12.
増速室14を上昇する過程で速度が増大された粉砕炭流23は、次いで前記整流室27を上昇する。該整流室27を上昇する粉砕炭流23は、前記倒立円錐台部25の内壁に沿って旋回流の直径が拡径されるのに伴い、前記粉砕炭流23の流速が減少する。   The pulverized coal flow 23 whose speed has been increased in the process of ascending the speed increasing chamber 14 then moves up the rectifying chamber 27. As the diameter of the swirling flow increases along the inner wall of the inverted truncated cone portion 25, the flow velocity of the pulverized coal flow 23 rising in the rectifying chamber 27 decreases.
粉砕炭流23は、流速が減少することで安定した流れとなり、更に前記円筒部26の内壁に沿って旋回しながら垂直に上昇する様整流される。上昇方向が垂直な旋回流へと整流されることで、粉砕炭流23が前記分級機21の一部に集中して流入するのを防止することができるので、該分級機21に流入する粉砕炭流23の流量分布の均一化を図ることができ、分級性能を向上させることができる。   The pulverized coal flow 23 becomes a stable flow as the flow velocity decreases, and is further rectified so as to rise vertically while swirling along the inner wall of the cylindrical portion 26. Since the ascending direction is rectified into a vertical swirling flow, the pulverized coal flow 23 can be prevented from concentrating and flowing into a part of the classifier 21, so that the pulverization flowing into the classifier 21 can be prevented. The flow distribution of the coal flow 23 can be made uniform, and the classification performance can be improved.
又、粉砕炭流23を旋回しながら垂直に上昇する様整流したことで、粉砕炭流23がブレード19に対して直交する方向から前記分級機21に流入し易くなり、該分級機21の性能を安定させることができる。   Further, since the pulverized coal stream 23 is rectified so as to rise vertically while swirling, the pulverized coal stream 23 easily flows into the classifier 21 from the direction orthogonal to the blade 19, and the performance of the classifier 21 is improved. Can be stabilized.
次に、図3に於いて、本発明の第3の実施例について説明する。尚、図3中、図1中と同等のものには同符号を付し、その説明を省略する。   Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
第3の実施例では、ハウジング2が粉砕部3と増速部4と整流部28とによって構成されている。該整流部28は、増速部4の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部29と、該倒立円錐台部29の上端より上方に延出する円筒形状の大円筒部31と、該大円筒部31の上端より上方に延出し上方に向って縮径する円錐台形状の2次増速部32と、該2次増速部32の上端より上方に向って延出する円筒形状の小円筒部33により構成され、前記整流部28の内部に整流室34が形成される。尚、該整流室34は、前記2次増速部32により2次遠心分級を行う2次遠心分級部としても作用する。   In the third embodiment, the housing 2 is constituted by the pulverizing part 3, the speed increasing part 4, and the rectifying part 28. The straightening portion 28 extends upward from the upper end of the speed increasing portion 4 and extends upward from the upper end of the inverted truncated cone portion 29, and an inverted truncated cone portion 29 having an inverted truncated cone shape that expands in diameter upward. From a cylindrical large cylindrical portion 31, a frustoconical secondary speed increasing portion 32 that extends upward from the upper end of the large cylindrical portion 31 and contracts in diameter upward, and from the upper end of the secondary speed increasing portion 32 A rectifying chamber 34 is formed inside the rectifying unit 28, which is constituted by a small cylindrical portion 33 having a cylindrical shape extending upward. The rectifying chamber 34 also functions as a secondary centrifugal classifying unit that performs secondary centrifugal classification by the secondary speed increasing unit 32.
尚、分級機21は前記整流室34の上部、即ち前記小円筒部33に同心に収納される。   The classifier 21 is housed concentrically in the upper portion of the rectifying chamber 34, that is, in the small cylindrical portion 33.
シュート18より投入され、加圧ローラ9により粉砕された粉砕炭は、1次空気に吹上げられて粉砕炭流23として分級室12内の外周部を旋回しながら上昇する。   The pulverized coal introduced from the chute 18 and pulverized by the pressure roller 9 is blown up to the primary air and ascends as the pulverized coal flow 23 turns around the outer periphery of the classification chamber 12.
増速室14を上昇する過程で速度が増大された粉砕炭流23は、次いで前記整流室34を上昇する。該整流室34を上昇する粉砕炭流23は、前記倒立円錐台部29の内壁に沿って旋回流の直径が拡径されるのに伴い、粉砕炭流23の流速が低下する。   The pulverized coal flow 23 whose speed has been increased in the process of moving up the speed increasing chamber 14 then moves up the rectifying chamber 34. As the diameter of the swirling flow increases along the inner wall of the inverted truncated cone portion 29, the flow velocity of the pulverized coal flow 23 decreases.
その後、前記大円筒部31の内壁に沿って粉砕炭流23が旋回しながら垂直に上昇する様整流された後、前記2次増速部32の内壁に沿って再度旋回流の直径が縮径され、粉砕炭流23の流速が増大する。   Thereafter, the pulverized coal flow 23 is rectified so as to rise vertically while turning along the inner wall of the large cylindrical portion 31, and then the diameter of the swirling flow is reduced again along the inner wall of the secondary speed increasing portion 32. As a result, the flow rate of the pulverized coal flow 23 increases.
粉砕炭流23の流速が再度増大されることで、粉砕炭流23中の粉砕炭に作用する遠心力が大きくなり、再度遠心分級が行われ、前記粉砕室13、前記増速室14で分離できなかった粗粉炭を、遠心力により粉砕炭流23から径方向に分離させることができる。   By increasing the flow rate of the pulverized coal flow 23 again, the centrifugal force acting on the pulverized coal in the pulverized coal flow 23 is increased, and centrifugal classification is performed again, and the pulverized coal stream 23 and the speed increasing chamber 14 are separated. Coarse coal that could not be produced can be separated from the pulverized coal flow 23 in the radial direction by centrifugal force.
粉砕炭流23から分離された粗粉炭は、前記2次増速部32の内壁から下方へ力を受け落下し、前記倒立円錐台部29の内壁に沿って滑落し、前記粉砕テーブル7上に落下する。   Coarse coal separated from the pulverized coal flow 23 receives a force downward from the inner wall of the secondary speed increasing portion 32 and falls down, slides down along the inner wall of the inverted truncated cone portion 29, and is placed on the pulverizing table 7. Fall.
又、前記2次増速部32の内壁に沿って縮径されることで流速が増大した粉砕炭流23は、前記小円筒部33の内壁に沿って再度上昇方向が垂直な旋回流へと整流され、整流された粉砕炭流23が前記分級機21に流入する。   Further, the pulverized coal flow 23 whose flow velocity has been increased by being reduced in diameter along the inner wall of the secondary speed increasing portion 32 is again turned into a swirling flow whose ascending direction is vertical along the inner wall of the small cylindrical portion 33. The rectified and rectified pulverized coal stream 23 flows into the classifier 21.
この時、該分級機21の回転速度は、前記2次増速部32による粉砕炭流23の流速の増大に応じて増大させるのが望ましい。   At this time, it is desirable to increase the rotational speed of the classifier 21 in accordance with the increase in the flow rate of the pulverized coal flow 23 by the secondary speed increasing unit 32.
粉砕炭流23が上昇方向が垂直な旋回流へと整流されることで、分級機21に流入する粉砕炭流23の流量分布が均一となり、分級性能を向上させることができる。   Since the pulverized coal flow 23 is rectified into a swirl flow whose vertical direction is vertical, the flow distribution of the pulverized coal flow 23 flowing into the classifier 21 becomes uniform, and the classification performance can be improved.
又、前記2次増速部32によって、粉砕炭流23に作用する遠心力を増大させ、再度遠心分級を行う様にしたので、前記粉砕室13、前記増速室14で分離できなかった粗粉炭を、遠心力により粉砕炭流23から径方向に分離させることができ、前記竪型ミル1に於ける分級性能を向上させることができる。   In addition, since the centrifugal force acting on the pulverized coal flow 23 is increased by the secondary speed increasing portion 32 and the centrifugal classification is performed again, the coarse that could not be separated in the pulverizing chamber 13 and the speed increasing chamber 14 could be obtained. The pulverized coal can be separated from the pulverized coal flow 23 in the radial direction by centrifugal force, and the classification performance in the vertical mill 1 can be improved.
又、前記整流室34内で粉砕炭流23を再度増速させる様にしたので、前記分級機21にて分級され、図示しないボイラのバーナに送給される微粉炭の量を増加させることができる。従って、前記増速室14と前記整流室34に於ける粉砕炭流23の上昇速度の差によって粉砕炭が前記整流室34内に滞留し、ミル差圧が上昇するのを抑制することができると共に、粉砕容量の増大を図ることができる。   Further, since the speed of the pulverized coal flow 23 is increased again in the rectifying chamber 34, the amount of pulverized coal classified by the classifier 21 and fed to a burner (not shown) can be increased. it can. Therefore, it is possible to suppress the pulverized coal from staying in the rectifying chamber 34 due to the difference in the rising speed of the pulverized coal flow 23 in the speed increasing chamber 14 and the rectifying chamber 34, thereby preventing the mill differential pressure from rising. At the same time, the grinding capacity can be increased.
次に、図4に於いて、本発明の第4の実施例について説明する。尚、図4中、図3中と同等のものには同符号を付し、その説明を省略する。   Next, a fourth embodiment of the present invention will be described with reference to FIG. 4 that are the same as those in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted.
第4の実施例では、第3の実施例に於ける整流部28の大円筒部31に、図示しない送風機に接続され、整流室34に接線方向から連通する補助1次空気供給口35を設けている。   In the fourth embodiment, an auxiliary primary air supply port 35 connected to a blower (not shown) and communicating from the rectifying chamber 34 in the tangential direction is provided in the large cylindrical portion 31 of the rectifying portion 28 in the third embodiment. ing.
該補助1次空気供給口35は、供給された補助1次空気が上方に向って旋回する旋回流を形成できる様、前記大円筒部31の外壁に対して下方且つ周方向に傾斜して設けられている。尚、前記補助1次空気供給口35の傾斜角度(水平に対する角度)は、供給された補助1次空気が、前記整流室34内を旋回しながら上昇する粉砕炭流23の流速を加速可能な角度とすることが望ましい。   The auxiliary primary air supply port 35 is provided so as to be inclined downward and circumferentially with respect to the outer wall of the large cylindrical portion 31 so as to form a swirling flow in which the supplied auxiliary primary air swirls upward. It has been. The inclination angle of the auxiliary primary air supply port 35 (the angle with respect to the horizontal) can accelerate the flow rate of the pulverized coal flow 23 that rises while the supplied auxiliary primary air swirls in the rectifying chamber 34. An angle is desirable.
石炭の粉砕処理時には、前記整流室34内を旋回しながら上昇する粉砕炭流23に対して、前記補助1次空気供給口35より補助1次空気を供給することで、粉砕炭流23の流速を増大させることができる。従って、2次増速部32に於いて再度行われる遠心分級の効果を更に増大させることができ、分級性能の向上を図ることができる。   At the time of the coal pulverization process, the auxiliary primary air is supplied from the auxiliary primary air supply port 35 to the pulverized coal flow 23 that rises while swirling in the rectifying chamber 34, whereby the flow velocity of the pulverized coal flow 23 is increased. Can be increased. Therefore, the effect of centrifugal classification performed again in the secondary speed increasing unit 32 can be further increased, and the classification performance can be improved.
又この時、前記分級機21の回転速度は、上昇する粉砕炭流23の流速に合わせて増大させる。   At this time, the rotational speed of the classifier 21 is increased in accordance with the flow speed of the rising pulverized coal flow 23.
補助1次空気により粉砕炭流23の流速を増大可能としたことで、図示しないボイラのバーナに送給される微粉炭の量を、第3の実施例よりも更に増加させることができる為、前記増速室14と前記整流室34の粉砕炭流23の上昇速度の違いによるミル差圧の上昇を更に抑制でき、更に粉砕容量の増大を図ることができる。   Since the flow rate of the pulverized coal flow 23 can be increased by the auxiliary primary air, the amount of pulverized coal fed to a boiler burner (not shown) can be further increased than in the third embodiment. It is possible to further suppress an increase in the mill differential pressure due to a difference in the rising speed of the pulverized coal flow 23 between the speed increasing chamber 14 and the rectifying chamber 34, and further increase the pulverization capacity.
尚、本発明では、石炭の粉砕について説明したが、本発明の竪型ミルは、石灰岩等他の塊状物の粉砕に於いても適用可能であるのは言う迄もない。   In the present invention, the pulverization of coal has been described, but it is needless to say that the vertical mill of the present invention can also be applied to the pulverization of other massive materials such as limestone.
1 竪型ミル
2 ハウジング
3 粉砕部
4 増速部
5 整流部
7 粉砕テーブル
9 加圧ローラ
17 吹出し口
21 分級機
23 粉砕炭流
24 整流部
25 倒立円錐台部
26 円筒部
27 整流室
28 整流部
29 倒立円錐台部
31 大円筒部
32 2次増速部
33 小円筒部
34 整流室
35 補助1次空気供給口
DESCRIPTION OF SYMBOLS 1 Vertical mill 2 Housing 3 Crushing part 4 Speed increasing part 5 Rectification part 7 Crushing table 9 Pressure roller 17 Outlet 21 Classifier 23 Crushing coal flow 24 Rectification part 25 Inverted truncated cone part 26 Cylindrical part 27 Rectification room 28 Rectification part 29 Inverted truncated cone part 31 Large cylindrical part 32 Secondary acceleration part 33 Small cylindrical part 34 Rectification room 35 Auxiliary primary air supply port

Claims (5)

  1. 円筒状の粉砕部と、該粉砕部の上端より上方に延出し上方に向って縮径する円錐台形状の増速部と、該増速部の上端より上方に延出する整流部とで構成され、分級室を形成するハウジングと、前記整流部に設けられた分級機と、前記粉砕部の下部に設けられた粉砕テーブルと、該粉砕テーブルに押圧され、塊状物を粉砕する加圧ローラと、前記粉砕テーブルの周囲より前記分級室内を旋回する様1次空気を噴出することを特徴とする竪型ミル。   Consists of a cylindrical pulverizing part, a truncated cone-shaped speed increasing part extending upward from the upper end of the pulverizing part and reducing the diameter upward, and a rectifying part extending upward from the upper end of the speed increasing part A classification chamber, a classifier provided in the rectifying unit, a pulverizing table provided in a lower portion of the pulverizing unit, and a pressure roller that is pressed by the pulverizing table and pulverizes the lump. A vertical mill that ejects primary air from the periphery of the crushing table so as to swivel in the classification chamber.
  2. 前記整流部は、前記増速部の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部と、該倒立円錐台部の上端より上方に向って延出する円筒形状の大円筒部と、該大円筒部の上端より上方に延出し上方に向って縮径する円錐台形状の2次増速部と、該2次増速部の上端より上方に向って延出する円筒形状の小円筒部とからなり、前記分級機は前記小円筒部に設けられた請求項1の竪型ミル。   The straightening portion includes an inverted truncated cone portion extending upward from the upper end of the speed increasing portion and expanding upward, and a cylinder extending upward from the upper end of the inverted truncated cone portion. A large cylindrical portion having a shape, a truncated cone-shaped secondary speed increasing portion extending upward from the upper end of the large cylindrical portion, and extending upward from the upper end of the secondary speed increasing portion. The vertical mill according to claim 1, further comprising a cylindrical small cylindrical portion that comes out, wherein the classifier is provided in the small cylindrical portion.
  3. 前記大円筒部は、周面より接線方向に補助1次空気を噴出し、旋回流を増速する補助1次空気供給口を更に具備する請求項2の竪型ミル。   3. The vertical mill according to claim 2, wherein the large cylindrical portion further includes an auxiliary primary air supply port that ejects auxiliary primary air in a tangential direction from a peripheral surface to increase a swirl flow.
  4. 前記整流部は、前記増速部の上端より上方に延出し上方に向って拡径する倒立円錐台形状の倒立円錐台部と、該倒立円錐台部の上端より上方に向って延出する円筒形状の円筒部とからなり、前記分級機は前記円筒部に設けられた請求項1の竪型ミル。   The straightening portion includes an inverted truncated cone portion extending upward from the upper end of the speed increasing portion and expanding upward, and a cylinder extending upward from the upper end of the inverted truncated cone portion. The vertical mill according to claim 1, further comprising a cylindrical portion having a shape, wherein the classifier is provided in the cylindrical portion.
  5. 前記整流部は、円筒形状である請求項1の竪型ミル。   The vertical mill according to claim 1, wherein the rectifying unit has a cylindrical shape.
JP2011085997A 2011-04-08 2011-04-08 Vertical mill Pending JP2012217920A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105080667A (en) * 2014-05-23 2015-11-25 郭怀铭 Vertical centrifugal mill
WO2018016266A1 (en) * 2016-07-21 2018-01-25 株式会社Ihi Vertical roller mill
WO2018016104A1 (en) * 2016-07-21 2018-01-25 株式会社Ihi Vertical roller mill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6283052A (en) * 1985-10-07 1987-04-16 Ube Industries Vertical type crusher
JPH0322539U (en) * 1989-07-13 1991-03-08
JPH03193142A (en) * 1989-12-22 1991-08-22 Babcock Hitachi Kk Vertical mill
JP2005113125A (en) * 2003-09-17 2005-04-28 Ube Ind Ltd Production process of woody fuel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6283052A (en) * 1985-10-07 1987-04-16 Ube Industries Vertical type crusher
JPH0322539U (en) * 1989-07-13 1991-03-08
JPH03193142A (en) * 1989-12-22 1991-08-22 Babcock Hitachi Kk Vertical mill
JP2005113125A (en) * 2003-09-17 2005-04-28 Ube Ind Ltd Production process of woody fuel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105080667A (en) * 2014-05-23 2015-11-25 郭怀铭 Vertical centrifugal mill
WO2018016266A1 (en) * 2016-07-21 2018-01-25 株式会社Ihi Vertical roller mill
WO2018016104A1 (en) * 2016-07-21 2018-01-25 株式会社Ihi Vertical roller mill
US10967382B2 (en) 2016-07-21 2021-04-06 Ihi Corporation Vertical roller mill

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