JP6680275B2 - Foreign matter removal method - Google Patents
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- JP6680275B2 JP6680275B2 JP2017136095A JP2017136095A JP6680275B2 JP 6680275 B2 JP6680275 B2 JP 6680275B2 JP 2017136095 A JP2017136095 A JP 2017136095A JP 2017136095 A JP2017136095 A JP 2017136095A JP 6680275 B2 JP6680275 B2 JP 6680275B2
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- 238000000034 method Methods 0.000 title claims description 34
- 238000005338 heat storage Methods 0.000 claims description 112
- 239000000571 coke Substances 0.000 claims description 27
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000011449 brick Substances 0.000 description 72
- 238000002485 combustion reaction Methods 0.000 description 52
- 239000007789 gas Substances 0.000 description 31
- 238000004140 cleaning Methods 0.000 description 23
- 239000011230 binding agent Substances 0.000 description 14
- 238000003763 carbonization Methods 0.000 description 14
- 239000002737 fuel gas Substances 0.000 description 10
- 238000007664 blowing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 206010022000 influenza Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
本発明は、蓄熱室の異物を除去する異物の除去方法に関する。 TECHNICAL FIELD The present invention relates to a foreign matter removing method for removing foreign matter in a heat storage chamber.
室炉式コークス炉は、炭化室と、当該炭化室に熱を供給する燃焼室とが、炉幅方向に交互に並ぶように設けられた上部構造と、燃焼室に燃焼用空気と燃料ガスとを供給する蓄熱室が形成された下部構造とから構成される。燃焼室で発生した熱は、炉壁レンガを介して炭化室に供給され、この熱によって石炭が乾留されてコークスが生成する。コークスは、側面の炉口の炉蓋を開放し、一方の炉口から他方の炉口へ向けて押出されて排出される。 The chamber furnace type coke oven has an upper structure in which a carbonization chamber and a combustion chamber that supplies heat to the carbonization chamber are alternately arranged in the furnace width direction, and combustion air and fuel gas are provided in the combustion chamber. And a lower structure in which a heat storage chamber for supplying heat is formed. The heat generated in the combustion chamber is supplied to the carbonization chamber through the bricks of the furnace wall, and the heat causes carbon to be carbonized to produce coke. The coke is pushed out from one furnace opening toward the other furnace opening by opening the furnace lid of the side furnace opening and discharged.
蓄熱室は、燃焼排ガスの余熱を利用して燃焼室に供給される燃焼用空気と燃料ガスを予熱する。蓄熱室は、蓄熱室内に棒状レンガを格子状に組み上げる方式、蓄熱室内に多孔質レンガを組み上げる方式、ないしは両者を組み合わせた方式から構成される。蓄熱室にこれら方式によりレンガを設置し、これらのレンガに燃焼排ガスが有する余熱を受熱させ、受熱した熱で燃焼室に供給する燃焼用空気と燃料ガスとを予熱する。 The heat storage chamber preheats the combustion air and the fuel gas supplied to the combustion chamber by using the residual heat of the combustion exhaust gas. The heat storage chamber is composed of a system in which rod-shaped bricks are assembled in a lattice in the heat storage chamber, a system in which porous bricks are assembled in the heat storage chamber, or a system in which both are combined. Bricks are installed in the heat storage chamber by these methods, the residual heat of the combustion exhaust gas is received by these bricks, and the combustion air and the fuel gas supplied to the combustion chamber are preheated by the received heat.
近年では、コークス炉の寿命が４０年を超えるものが出てきている。コークス炉の長期間の使用により炭化室および燃焼室の炉壁レンガは劣化・損傷するが、コークス炉を全て取り壊し、改めて建設を行うと膨大な費用がかかる。このため、炉壁レンガの劣化・損傷に対しては、劣化・損傷した炉壁レンガのみを部分的に解体し、これを積み替える補修が実施されている。 In recent years, some coke ovens have a life of over 40 years. The long-term use of the coke oven deteriorates and damages the bricks in the carbonization chamber and the combustion chamber, but if the coke oven is completely demolished and rebuilt, it will be extremely expensive. For this reason, with respect to deterioration and damage of furnace wall bricks, repair is carried out by partially dismantling only the deteriorated and damaged furnace wall bricks and reloading them.
燃料ガスおよび燃焼用空気は、蓄熱室を経由して燃焼室に供給される。燃焼室の燃焼機能を維持するには、蓄熱室のガス流路の健全性を確保する必要がある。蓄熱室は、棒状レンガおよび／または多孔質レンガが組み上げられて構成されており、老朽炉では、損傷レンガやばいじん等によってこれらレンガの間隙で形成されるガス流路が閉塞し、これにより、燃料ガスまたは燃焼用空気の通気抵抗が上昇し、燃焼室の燃焼機能が低下する。 The fuel gas and the combustion air are supplied to the combustion chamber via the heat storage chamber. In order to maintain the combustion function of the combustion chamber, it is necessary to ensure the soundness of the gas flow path of the heat storage chamber. The heat storage chamber is configured by assembling rod-shaped bricks and / or porous bricks, and in an aging furnace, a gas flow path formed in a gap between these bricks is blocked by damaged bricks, dust, or the like, which causes fuel to flow. The ventilation resistance of gas or combustion air increases, and the combustion function of the combustion chamber decreases.
蓄熱室のガス流路の健全性を確保する技術として、特許文献１には、気吹ノズルが設けられたテレスコープ式の伸縮管と、当該伸縮管内に配設されたホースと巻き取りリールとを備え、気吹ノズルから蓄熱室へ直接空気を送り込み、蓄熱室内の比較的軽い異物を除去する蓄熱室清掃装置が開示されている。 As a technique for ensuring the soundness of the gas flow path of the heat storage chamber, Patent Document 1 discloses a telescopic expansion / contraction tube provided with an air-blowing nozzle, a hose and a take-up reel arranged in the expansion / contraction tube. There is disclosed a heat storage chamber cleaning device for directly feeding air from the air blowing nozzle to the heat storage chamber to remove relatively light foreign matter in the heat storage chamber.
室炉式コークス炉は、蓄熱室と燃焼室とが連結して閉じた系になっているので、特許文献１に開示された蓄熱室清掃装置では、圧縮空気の吹込みにより飛散した異物が燃焼室内にとどまり、コークス炉外へ排出されない。このため、コークス炉を使用していくうちに、再び、異物が蓄熱室に入り蓄熱室のガス流路を閉塞していた。 Since the chamber furnace type coke oven is a closed system in which the heat storage chamber and the combustion chamber are connected to each other, in the heat storage chamber cleaning device disclosed in Patent Document 1, foreign matter scattered by blowing compressed air is burned. It stays indoors and is not discharged outside the coke oven. Therefore, while the coke oven was used, foreign matter again entered the heat storage chamber and blocked the gas flow path of the heat storage chamber.
本発明は、このような従来技術の問題点を鑑みてなされたものであり、その目的とするところは、蓄熱室から除去された異物が、再び、蓄熱室に戻ることを防止できる異物の除去方法を提供することにある。 The present invention has been made in view of the above problems of the conventional technology, and an object thereof is to remove foreign matter that can prevent foreign matter removed from the heat storage chamber from returning to the heat storage chamber again. To provide a method.
このような課題を解決するための本発明の特徴は、以下の通りである。
（１）室炉式コークス炉における蓄熱室の異物の除去方法であって、
蓄熱室の上方の耐火物を解体除去した後に、前記蓄熱室の下方から蓄熱室へ気体を送給して異物を除去する、異物の除去方法。
（２）前記蓄熱室の上端における気体の流速が３．２ｍ／ｓｅｃより高くなるように、前記蓄熱室の下方より気体を送給する、（１）に記載の異物の除去方法。
（３）前記蓄熱室の下方から前記蓄熱室へ気体を送給するとともに、前記蓄熱室の上方から前記気体を吸引する、（１）または（２）に記載の異物の除去方法。
The features of the present invention for solving such a problem are as follows.
(1) A method for removing foreign matter from a heat storage chamber in a chamber furnace type coke oven,
A method for removing foreign matter, which comprises removing a refractory material above a heat storage chamber by dismantling and removing the foreign matter, and then supplying gas from below the heat storage chamber to the heat storage chamber to remove foreign matter.
(2) The foreign matter removing method according to (1), wherein the gas is fed from below the heat storage chamber such that the flow velocity of the gas at the upper end of the heat storage chamber is higher than 3.2 m / sec.
(3) The method for removing foreign matter according to (1) or (2), wherein the gas is supplied to the heat storage chamber from below the heat storage chamber, and the gas is sucked from above the heat storage chamber.
本発明に係る異物の除去方法では、蓄熱室上方の燃焼室を構成する炉壁レンガを解体除去した後に、蓄熱室の下方から蓄熱室に気体を送給する。蓄熱室に気体を供給するまでに燃焼室はすでに解体除去されているので、蓄熱室から除去された異物は、燃焼室に留まることなく室炉式コークス炉の系外に除去できる。これにより、蓄熱室から除去された異物が再び蓄熱室に戻ることを防止できる。 In the method of removing foreign matter according to the present invention, after the furnace wall bricks forming the combustion chamber above the heat storage chamber are dismantled and removed, gas is fed from below the heat storage chamber to the heat storage chamber. Since the combustion chamber has already been dismantled and removed by the time the gas is supplied to the heat storage chamber, the foreign matter removed from the heat storage chamber can be removed outside the system of the chamber furnace type coke oven without remaining in the combustion chamber. This can prevent foreign matter removed from the heat storage chamber from returning to the heat storage chamber again.
高炉で使用されるコークスは、室炉式コークス炉で石炭が乾留されて製造される。図１は、室炉式コークス炉の断面模式図である。室炉式コークス炉１０は、石炭を乾留する炭化室２２と燃料ガスを燃焼させて乾留に必要な熱を供給する燃焼室２４とが交互に並ぶよう配設された上部構造２０を有する。燃焼室２４にはフリュー２６が多数形成されている。燃焼室２４と炭化室２２とは炉長方向に延在する炉壁レンガ２８によって炉幅方向に区画され、燃焼室２４は、炉幅方向に延在するビンダーレンガ３０によって炉長方向に多数のフリューに区画されている。本実施形態において、炉壁レンガ２８、ビンダーレンガ３０は、蓄熱室４２の上方に設けられた耐火物の一例である。 The coke used in the blast furnace is produced by the carbonization of coal in a room furnace type coke oven. FIG. 1 is a schematic cross-sectional view of a chamber furnace type coke oven. The chamber furnace coke oven 10 has an upper structure 20 in which carbonization chambers 22 for carbonizing carbon are burned and combustion chambers 24 for burning fuel gas to supply heat necessary for carbonization are alternately arranged. A large number of flues 26 are formed in the combustion chamber 24. The combustion chamber 24 and the carbonization chamber 22 are partitioned in the furnace width direction by the furnace wall bricks 28 extending in the furnace length direction, and the combustion chamber 24 is divided in the furnace length direction by the binder bricks 30 extending in the furnace width direction. It is divided into flues. In the present embodiment, the furnace wall brick 28 and the binder brick 30 are an example of a refractory material provided above the heat storage chamber 42.
また、室炉式コークス炉１０は、燃焼室２４に供給される燃焼用空気と燃料ガスが通る蓄熱室４２および下部水平煙道４４と、燃焼排ガスが通る小煙道４６と、が形成された下部構造４０を有する。図２は、蓄熱室の断面模式図である。また、図３は、蓄熱室に配置されているレンガの斜視図である。蓄熱室４２は、クロスキャナル５０およびビンダーレンガ３０内部を介してフリュー２６に接続している。また、蓄熱室４２の下方には、蓄熱室４２を支えるグレートレンガ５２が設けられ、グレートレンガ５２の上方には吹かし孔５４が形成され、グレートレンガ５２の下方には下部水平煙道４４が形成されている。 Further, in the chamber furnace type coke oven 10, the heat storage chamber 42 and the lower horizontal flue 44 through which the combustion air and the fuel gas supplied to the combustion chamber 24 pass, and the small flue 46 through which the combustion exhaust gas passes are formed. It has a lower structure 40. FIG. 2 is a schematic sectional view of the heat storage chamber. Further, FIG. 3 is a perspective view of a brick arranged in the heat storage chamber. The heat storage chamber 42 is connected to the flu 26 via the black scanner 50 and the inside of the binder brick 30. Further, below the heat storage chamber 42, a great brick 52 that supports the heat storage chamber 42 is provided, an blowing hole 54 is formed above the great brick 52, and a lower horizontal flue 44 is formed below the great brick 52. Has been done.
本実施形態における蓄熱室４２は、上領域５６、中領域５８および下領域６０から構成される。上領域５６には、図３（ａ）に示す棒状のギッターレンガ６２が井桁状に組み上げられて設置されている。井桁状とは、格子状であって、ある段のギッターレンガ６２とその２段上のギッターレンガ６２とが上から見たときに隙間が見えないようにずらされた配置である。中領域５８には、図３（ｂ）に示す多孔質のチェッカーレンガ６４が組み上げられて設置されている。また、下領域６０には、上領域５６と同じギッターレンガ６２が井桁状に組み上げられて設置されている。 The heat storage chamber 42 in this embodiment includes an upper region 56, a middle region 58, and a lower region 60. In the upper region 56, the rod-shaped getter bricks 62 shown in FIG. 3A are assembled and installed in a cross beam shape. The cross girder-like shape is a grid-like arrangement in which the gitter bricks 62 at a certain step and the gitter bricks 62 at the second step are displaced so that no gap can be seen when viewed from above. In the middle region 58, a porous checker brick 64 shown in FIG. 3B is assembled and installed. Further, in the lower region 60, the same getter bricks 62 as those in the upper region 56 are assembled and installed in a cross beam shape.
再び、図１を参照する。燃焼室２４と蓄熱室４２は、炉長方向の中央部を境に左右２つに区分されている。図面の左側の燃焼室２４における燃料ガスの燃焼によって生じた高温の燃焼排ガスは、図面右側の燃焼室２４、蓄熱室４２を通り、右側の下部水平煙道４４を通って小煙道４６から排出される。このとき、高温の燃焼排ガスが蓄熱室４２のギッターレンガ６２およびチェッカーレンガ６４の間隙（以後、ガス流路と記載する）を通ることで、高温の燃焼排ガスの余熱がこれらレンガに受熱される。その後、ガス系統を切り換え、右側の下部水平煙道４４と右側の蓄熱室４２を通じて燃焼室２４に燃焼用空気と燃料ガスを供給する。これにより、蓄熱室４２のギッターレンガ６２およびチェッカーレンガ６４に受熱させた熱で燃焼用空気と燃料ガスとを予熱する。このようにして、室炉式コークス炉１０では熱の有効利用が図られている。 Referring again to FIG. The combustion chamber 24 and the heat storage chamber 42 are divided into two right and left with a central portion in the furnace length direction as a boundary. The high temperature flue gas generated by the combustion of the fuel gas in the combustion chamber 24 on the left side of the drawing passes through the combustion chamber 24 and the heat storage chamber 42 on the right side of the drawing, and is discharged from the small flue 46 through the lower horizontal flue 44 on the right side. To be done. At this time, the high temperature combustion exhaust gas passes through the gap (hereinafter referred to as a gas flow path) between the getter bricks 62 and the checker bricks 64 of the heat storage chamber 42, so that the residual heat of the high temperature combustion exhaust gas is received by these bricks. Then, the gas system is switched to supply combustion air and fuel gas to the combustion chamber 24 through the lower horizontal flue 44 on the right side and the heat storage chamber 42 on the right side. Thereby, the combustion air and the fuel gas are preheated by the heat received by the getter bricks 62 and the checker bricks 64 in the heat storage chamber 42. In this way, effective utilization of heat is achieved in the chamber furnace type coke oven 10.
損傷レンガやばいじん等の異物が蓄熱室４２に入り込み、当該異物によってギッターレンガ６２およびチェッカーレンガ６４のガス流路が閉塞されると、当該ガス流路の通気抵抗が上昇し、各フリュー２６に送られる燃焼用空気または燃料ガスが減少する。これにより、フリュー２６における燃焼機能が低下し、フリュー２６の温度および炭化室２２の温度が低下し、この結果、コークスの生産性が低下する。このため、ギッターレンガ６２およびチェッカーレンガ６４のガス流路を閉塞する異物の除去は、室炉式コークス炉１０の生産性を維持するために重要である。 When foreign matter such as damaged bricks and dust enters the heat storage chamber 42 and the foreign matter blocks the gas flow passages of the getter bricks 62 and the checker bricks 64, the ventilation resistance of the gas flow passages increases and is sent to each flue 26. Less combustion air or fuel gas is consumed. As a result, the combustion function of the flue 26 decreases, the temperature of the flue 26 and the temperature of the carbonization chamber 22 decrease, and as a result, the coke productivity decreases. Therefore, the removal of the foreign matter that blocks the gas flow paths of the getter bricks 62 and the checker bricks 64 is important for maintaining the productivity of the chamber coke oven 10.
本実施形態に係る異物の除去方法は、燃焼室２４を構成する炉壁レンガ２８およびビンダーレンガ３０を解体除去する除去工程と、蓄熱室４２の異物を除去する清掃工程とで構成される。除去工程では、異物の除去を行う蓄熱室４２を特定し、当該蓄熱室４２とクロスキャナル５０で接続された燃焼室２４の炉壁レンガ２８およびビンダーレンガ３０を解体除去する。炉壁レンガ２８およびビンダーレンガ３０を解体除去する方法は、特に限定するものではないが、例えば、重機を用いて炉頂側から順次、解体除去してよい。 The foreign matter removing method according to the present embodiment includes a removing step of dismantling and removing the furnace wall bricks 28 and the binder bricks 30 forming the combustion chamber 24, and a cleaning step of removing foreign matter in the heat storage chamber 42. In the removing step, the heat storage chamber 42 for removing foreign matter is specified, and the furnace wall bricks 28 and the binder bricks 30 of the combustion chamber 24 connected to the heat storage chamber 42 by the black scanner 50 are dismantled and removed. The method of dismantling and removing the furnace wall brick 28 and the binder brick 30 is not particularly limited, but, for example, it may be dismantled and removed sequentially from the furnace top side using a heavy machine.
炉壁レンガ２８およびビンダーレンガ３０を解体除去する除去工程が実施された後、蓄熱室４２の異物を除去する清掃工程が実施される。図４は、清掃工程を説明する室炉式コークス炉の断面模式図である。清掃工程は、蓄熱室４２の下方から蓄熱室４２へ空気を送給することで実施される。蓄熱室４２への空気の送給は、例えば、清掃装置７０を用いて実施される。なお、本実施形態において、空気は気体の一例である。 After the removal step of dismantling and removing the furnace wall brick 28 and the binder brick 30 is performed, a cleaning step of removing foreign matter in the heat storage chamber 42 is performed. FIG. 4 is a schematic sectional view of a chamber furnace type coke oven for explaining the cleaning step. The cleaning process is performed by sending air from below the heat storage chamber 42 to the heat storage chamber 42. The air is supplied to the heat storage chamber 42 by using, for example, the cleaning device 70. In addition, in this embodiment, air is an example of gas.
清掃装置７０は、長尺ノズル７２と、長尺ノズル７２の先端に設けられた上向きの空気噴出口７４とを備える。長尺ノズル７２および空気噴出口７４は、室炉式コークス炉１０の炉長方向の側端側から下部水平煙道４４に挿入され、上向きの空気噴出口７４が蓄熱室４２に対向する位置に位置決めされる。その状態で、空気噴出口７４から蓄熱室４２へ空気が直接送給される。 The cleaning device 70 includes a long nozzle 72 and an upward air ejection port 74 provided at the tip of the long nozzle 72. The long nozzle 72 and the air ejection port 74 are inserted into the lower horizontal flue 44 from the side end of the chamber-type coke oven 10 in the furnace length direction, and the upward air ejection port 74 faces the heat storage chamber 42. Positioned. In that state, air is directly fed from the air ejection port 74 to the heat storage chamber 42.
この蓄熱室４２への空気の送給により、ガス流路を閉塞させていた異物のうち、小さい異物は吹き飛ばされ、その一部は、クロスキャナル５０から外部に排出される。本実施形態に係る異物の除去方法では、清掃工程の前に除去工程が実施され、蓄熱室４２の上方の炉壁レンガ２８およびビンダーレンガ３０は解体除去されているので、クロスキャナル５０を通って排出された異物を室炉式コークス炉１０の系外に容易に除去できる。このため、蓄熱室４２から排出された異物は、再び蓄熱室４２に戻ることがない。 By supplying air to the heat storage chamber 42, among the foreign matters that have blocked the gas flow path, small foreign matters are blown off, and a part thereof is discharged to the outside from the black scanner 50. In the foreign matter removal method according to the present embodiment, the removal step is performed before the cleaning step, and the furnace wall bricks 28 and the binder bricks 30 above the heat storage chamber 42 have been dismantled and removed, so that they pass through the black scanner 50. The discharged foreign matter can be easily removed outside the system of the chamber furnace type coke oven 10. Therefore, the foreign matter discharged from the heat storage chamber 42 does not return to the heat storage chamber 42 again.
本実施形態に係る異物の除去方法では、清掃装置７０から蓄熱室４２へ空気を送給するが、蓄熱室４２の上端における空気の流速が３．２ｍ／ｓｅｃより高くなるように清掃装置７０から送給される空気の流量を定めることが好ましい。図５は、異物の直径と異物除去に必要な空気の流速との関係を示すグラフである。図５の横軸は異物直径（μｍ）であり、縦軸は空気の必要流速（ｍ／ｓ）である。図５は、異物重量と異物面圧（動圧×表面積）が同じになる空気の流速が異物除去に必要な流速であるとし、下記表１に示した条件で各直径の異物の除去に必要な空気の流速を算出したグラフである。 In the method of removing foreign matter according to the present embodiment, air is sent from the cleaning device 70 to the heat storage chamber 42, but the cleaning device 70 causes the air flow velocity at the upper end of the heat storage chamber 42 to be higher than 3.2 m / sec. It is preferred to define the flow rate of air delivered. FIG. 5 is a graph showing the relationship between the diameter of the foreign matter and the flow velocity of air required for removing the foreign matter. The horizontal axis of FIG. 5 is the foreign matter diameter (μm), and the vertical axis is the required air velocity (m / s). In FIG. 5, it is assumed that the flow velocity of air at which the foreign matter weight and the foreign matter surface pressure (dynamic pressure × surface area) are the same as the flow velocity required for foreign matter removal, and that the foreign matter of each diameter is removed under the conditions shown in Table 1 below. It is a graph which calculated the flow velocity of various air.
また、蓄熱室４２のガス流路を閉塞させる異物を調査した所、異物の約９０質量％が石炭を含む粒度５００μｍ以下の微粉であることがわかった。この結果と図５から、ガス流路を閉塞させる異物を移動させて閉塞を解消させるには、蓄熱室４２内の空気の流速を３．２ｍ／ｓｅｃより高くすればよいことがわかる。 Further, when foreign substances that block the gas flow path of the heat storage chamber 42 were investigated, it was found that about 90% by mass of the foreign substances was fine powder containing coal and having a particle size of 500 μm or less. From this result and FIG. 5, it can be understood that the flow velocity of the air in the heat storage chamber 42 may be set higher than 3.2 m / sec in order to move the foreign matter that blocks the gas flow path and remove the blockage.
蓄熱室４２には、チェッカーレンガ６４およびギッターレンガ６２が組み上げられており、これらレンガによる圧損があるが、蓄熱室４２の上端における空気の流速を３．２ｍ／ｓｅｃより高くすれば、それより下方の空気の流速は３．２ｍ／ｓｅｃより高くなる。このため、蓄熱室４２の上端における空気の流速を３．２ｍ／ｓｅｃより高くすることで、蓄熱室４２のガス流路を閉塞させるほぼ全ての異物を移動させることができ、これによりガス流路の閉塞を解消させることができる。 A checker brick 64 and a getter brick 62 are assembled in the heat storage chamber 42, and there is a pressure loss due to these bricks, but if the flow velocity of the air at the upper end of the heat storage chamber 42 is higher than 3.2 m / sec, it will be lower than that. The flow velocity of the air is higher than 3.2 m / sec. Therefore, by setting the flow velocity of the air at the upper end of the heat storage chamber 42 to be higher than 3.2 m / sec, almost all the foreign substances that block the gas flow passage of the heat storage chamber 42 can be moved, which allows the gas flow passage to be moved. It is possible to eliminate the blockage.
蓄熱室４２の上端における空気の流速は、クロスキャナル５０から排出される空気の流速を測定することによって測定できる。すなわち、クロスキャナル５０の断面積と空気の流速とからクロスキャナル５０から排出される空気の流量を算出し、当該空気の流量を蓄熱室４２の断面積で除算することで蓄熱室４２の上端における空気の流速を算出できる。 The flow velocity of air at the upper end of the heat storage chamber 42 can be measured by measuring the flow velocity of air discharged from the black scanner 50. That is, the flow rate of the air discharged from the black scanner 50 is calculated from the cross-sectional area of the black scanner 50 and the flow velocity of the air, and the flow rate of the air is divided by the cross-sectional area of the heat storage chamber 42 so that the temperature at the upper end of the heat storage chamber 42 is increased. The flow velocity of air can be calculated.
また、清掃工程では、蓄熱室４２の下方から蓄熱室４２へ空気を送給するとともに、空気を送給位置に最も近いクロスキャナル５０から空気を吸引することが好ましい。空気を吸引する設備として、吸引車８０を用いてよい。吸引車８０としては、例えば、兼松エンジニアリング株式会社製のパワープロベスター（登録商標）を用いることができる。除去工程によって蓄熱室４２の上方の炉壁レンガ２８およびビンダーレンガ３０は解体除去されているので、容易に吸引車８０の吸引ノズル８２をクロスキャナル５０の上端に密着させて蓄熱室４２の空気を吸引できる。 Further, in the cleaning step, it is preferable that the air is fed from the lower side of the heat storage chamber 42 to the heat storage chamber 42, and the air is sucked from the black scanner 50 closest to the feed position. A suction wheel 80 may be used as equipment for sucking air. As the suction wheel 80, for example, a power prober (registered trademark) manufactured by Kanematsu Engineering Co., Ltd. can be used. Since the furnace wall bricks 28 and the binder bricks 30 above the heat storage chamber 42 have been dismantled and removed by the removal process, the suction nozzle 82 of the suction wheel 80 can be easily brought into close contact with the upper end of the black scanner 50 to remove the air in the heat storage chamber 42. You can suck.
クロスキャナル５０から排出されない異物は、下部水平煙道４４に落下して除去されるか、蓄熱室４２に留まる。蓄熱室４２に留まった異物は、再び、ガス流路を閉塞させるおそれがある。吸引能力の高い吸引車８０を使用することで、蓄熱室４２の上方に吹き飛ばされた異物をクロスキャナル５０側に引き寄せ、当該異物をクロスキャナル５０の上方から捕集できる。このように、吸引車８０を使用することで、下方からの空気の送給だけでは除去できなかった異物も除去できるので、蓄熱室４２から除去される異物の量を増やすことができる。そして、蓄熱室４２から除去される異物の量を増やすことで、ガス流路の閉塞解消の効果を高めることができ、さらには、異物の飛散による作業環境の悪化をも抑制できる。 The foreign matter not discharged from the black scanner 50 falls to the lower horizontal flue 44 to be removed or remains in the heat storage chamber 42. The foreign matter remaining in the heat storage chamber 42 may again block the gas flow path. By using the suction wheel 80 having a high suction capability, the foreign matter blown above the heat storage chamber 42 can be drawn to the black scanner 50 side and the foreign matter can be collected from above the black scanner 50. As described above, by using the suction wheel 80, it is possible to remove foreign matter that could not be removed only by feeding air from below, so that the amount of foreign matter removed from the heat storage chamber 42 can be increased. Then, by increasing the amount of the foreign matter removed from the heat storage chamber 42, the effect of eliminating the blockage of the gas flow path can be enhanced, and further, the deterioration of the work environment due to the scattering of the foreign matter can be suppressed.
また、空気を吸引する装置として、例えば、掃除機のような簡易吸引装置を用いてもよい。除去工程によって蓄熱室４２の上方の炉壁レンガ２８およびビンダーレンガ３０は解体除去されているので、容易に掃除機の吸引ノズル８２をクロスキャナル５０の端部に密着させて空気を吸引できる。これにより、蓄熱室４２から排出される異物を捕集でき、異物の飛散による作業環境の悪化を抑制できる。このような清掃工程が実施された後に、除去工程で解体除去された蓄熱室４２の上方の炉壁レンガ２８およびビンダーレンガ３０を積み直し、フリュー２６を再構築する。 As a device for sucking air, for example, a simple suction device such as a vacuum cleaner may be used. Since the furnace wall bricks 28 and the binder bricks 30 above the heat storage chamber 42 have been dismantled and removed by the removing step, the suction nozzle 82 of the cleaner can be easily brought into close contact with the end portion of the black scanner 50 to suck air. Thereby, the foreign matter discharged from the heat storage chamber 42 can be collected, and the deterioration of the work environment due to the scattering of the foreign matter can be suppressed. After such a cleaning process is performed, the furnace wall bricks 28 and the binder bricks 30 above the heat storage chamber 42 that have been dismantled and removed in the removal process are reloaded, and the flue 26 is rebuilt.
なお、本実施形態に係る清掃工程において、清掃装置７０を用いて空気を蓄熱室４２に送給する例を示したがこれに限らない。例えば、空気を蓄熱室４２に案内する整流板を下部水平煙道４４に設置し、ブロワーを用いて空気を下部水平煙道４４に送給することで、空気を蓄熱室４２に送給してもよい。 In the cleaning process according to the present embodiment, the cleaning device 70 is used to supply air to the heat storage chamber 42, but the present invention is not limited to this. For example, a straightening vane that guides air to the heat storage chamber 42 is installed in the lower horizontal flue 44, and air is sent to the lower horizontal flue 44 by using a blower to send the air to the heat storage chamber 42. Good.
また、本実施形態に係る清掃工程において、清掃装置７０を下部水平煙道４４に挿入して実施する例を示したがこれに限らない。例えば、清掃装置７０をグレートレンガ５２の上方の吹かし孔５４に挿入して清掃工程を実施してもよい。 Further, in the cleaning process according to the present embodiment, an example in which the cleaning device 70 is inserted into the lower horizontal flue 44 and executed is shown, but the present invention is not limited to this. For example, the cleaning process may be performed by inserting the cleaning device 70 into the blowing hole 54 above the great brick 52.
また、除去工程において、まず、異物の除去を行う蓄熱室４２を特定し、当該蓄熱室４２と接続した燃焼室２４の炉壁レンガ２８およびビンダーレンガ３０を解体除去する例を示したがこれに限らない。例えば、まず、炉壁レンガ２８およびビンダーレンガ３０の積み替え補修が実施される燃焼室２４が特定され、当該燃焼室２４と接続した蓄熱室４２に、本実施形態に係る異物の除去方法を実施するとしてもよい。 Further, in the removal step, first, the heat storage chamber 42 for removing foreign matter is specified, and the furnace wall brick 28 and the binder brick 30 of the combustion chamber 24 connected to the heat storage chamber 42 are disassembled and removed. Not exclusively. For example, first, the combustion chamber 24 in which the transshipment repair of the furnace wall brick 28 and the binder brick 30 is performed is specified, and the heat storage chamber 42 connected to the combustion chamber 24 is subjected to the foreign matter removal method according to the present embodiment. May be
以上、説明したように、本実施形態に係る異物の除去方法の実施により、蓄熱室４２から除去された異物は、燃焼室２４に留まることなく室炉式コークス炉１０の系外に除去される。これにより、蓄熱室４２から除去された異物が再び蓄熱室４２に戻ることを防止できる。 As described above, the foreign matter removed from the heat storage chamber 42 is removed from the system of the chamber furnace type coke oven 10 without remaining in the combustion chamber 24 by performing the foreign matter removal method according to the present embodiment. . This can prevent the foreign matter removed from the heat storage chamber 42 from returning to the heat storage chamber 42 again.
室炉式コークス炉（炉高６．７ｍ、炉頂１５．８ｍ）における燃焼室の炉壁レンガ積み替え時に本実施形態に係る異物の除去方法を実施した。実施例１では、燃焼室を構成する炉壁レンガを解体除去後、図４に示した清掃装置７０と同じ装置を下部水平煙道に挿入し、圧縮空気（元圧０．５ＭＰａ）による蓄熱室への空気の送給を合計１時間実施した。 The foreign material removal method according to the present embodiment was carried out when the bricks of the furnace wall of the combustion chamber in the chamber furnace type coke oven (furnace height 6.7 m, furnace top 15.8 m) were reloaded. In Example 1, after the furnace wall bricks constituting the combustion chamber were dismantled and removed, the same device as the cleaning device 70 shown in FIG. 4 was inserted into the lower horizontal flue, and the heat storage chamber with compressed air (source pressure 0.5 MPa) was used. A total of 1 hour was supplied to the air.
上記方法で異物を除去した後、炉壁レンガを積み直して燃焼室を再構築した。その後、炭化室に石炭を装炭し、所定時間乾留させた後のフリュー温度を、炉長方向の炉壁側から７点、炉中央側から７点の計１４点の位置で測定した。所定時間後の各位置のフリューの温度を実施例１として図６に示す。 After removing the foreign matter by the above method, the bricks of the furnace wall were reloaded to reconstruct the combustion chamber. After that, coal was charged in the carbonization chamber, and the flue temperature after carbonization for a predetermined time was measured at a total of 14 points, 7 points from the furnace wall side in the furnace length direction and 7 points from the furnace center side. The temperature of the flue at each position after a predetermined time is shown as Example 1 in FIG.
実施例２では、燃焼室を構成する炉壁レンガを解体除去後、同じく図４に示した清掃装置７０と同じ装置を下部水平煙道に挿入し、圧縮空気（元圧０．５ＭＰａ）による蓄熱室への空気の送給を実施するとともに、パワープロベスター（登録商標）の吸引ノズルを、蓄熱室に空気を供給している位置に最も近いクロスキャナルに密着させて、蓄熱室の空気を吸引した。実施例２では、蓄熱室への空気の送給およびクロスキャナルからの空気の吸引（仕様吸引静圧：−９３ｋＰａ）を合計２時間実施した。 In Example 2, after the furnace wall bricks constituting the combustion chamber were dismantled and removed, the same device as the cleaning device 70 shown in FIG. 4 was inserted into the lower horizontal flue to store heat by compressed air (source pressure 0.5 MPa). The air is sent to the chamber, and the suction nozzle of the PowerProbester (registered trademark) is brought into close contact with the black scanner that is closest to the position supplying air to the heat storage chamber to suck the air in the heat storage chamber. did. In Example 2, feeding of air to the heat storage chamber and suction of air from the black scanner (specific suction static pressure: -93 kPa) were performed for a total of 2 hours.
上記方法で異物を除去した後、炉壁レンガを積み直して燃焼室を再構築した。その後、炭化室に石炭を装炭し、所定時間乾留させた後のフリュー温度を、炉長方向の炉壁側から７点、炉中央側から７点の計１４点の位置で測定した。所定時間後の各位置のフリューの温度を実施例２として図６に示す。 After removing the foreign matter by the above method, the bricks of the furnace wall were reloaded to reconstruct the combustion chamber. After that, coal was charged in the carbonization chamber, and the flue temperature after carbonization for a predetermined time was measured at a total of 14 points, 7 points from the furnace wall side in the furnace length direction and 7 points from the furnace center side. The temperature of the flue at each position after a predetermined time is shown as Example 2 in FIG.
比較例として、本実施形態に係る異物の除去方法が実施される前であって、実施例１、２と同じ条件でフリュー温度を、炉長方向の炉壁側から７点、炉中央側から７点の計１４点の位置で測定した。所定時間後の各位置のフリュー温度を比較例として図６に示す。 As a comparative example, the flue temperature was measured under the same conditions as in Examples 1 and 2 before the method for removing foreign matter according to the present embodiment was performed. The flue temperatures were 7 points from the furnace wall side in the furnace length direction and from the furnace center side. The measurement was carried out at a total of 14 points of 7 points. The flue temperature at each position after a predetermined time is shown in FIG. 6 as a comparative example.
図６は、各位置のフリュー温度を示すグラフである。図６において、横軸は炉長方向１６点のフリューの位置を示し、Ｙ１〜Ｙ７は炉壁側からの位置であり、Ｙ１６〜Ｙ１０は炉中央側からの位置である。また、縦軸はフリュー温度（℃）である。 FIG. 6 is a graph showing the flue temperature at each position. In FIG. 6, the horizontal axis indicates the positions of 16 flues in the furnace length direction, Y1 to Y7 are positions from the furnace wall side, and Y16 to Y10 are positions from the furnace center side. The vertical axis is the flue temperature (° C).
実施例１、２、比較例ともに炉壁側のフリュー温度は炉中央側のフリュー温度よりも低いが、これは、外気冷却および炉体劣化によるものである。実施例１、２のフリューの温度は、比較例のフリュー温度より高くなり、特に、実施例２のＹ１〜Ｙ７およびＹ１０〜Ｙ１６の平均温度は、比較例の平均温度より１０４℃も高くなった。この結果は、本実施形態に係る異物の除去方法の実施により各位置のフリューの燃焼性を向上できたことを示している。すなわち、本実施形態に係る異物の除去方法の実施により蓄熱室のガス流路を閉塞していた異物が除去され、且つ、この異物が除去された状態が維持され、これにより、各位置のフリューの燃焼性が向上したものと考えられる。 Although the flue temperature on the furnace wall side is lower than the flue temperature on the furnace center side in each of Examples 1 and 2 and Comparative Example, this is due to outside air cooling and deterioration of the furnace body. The flue temperatures of Examples 1 and 2 were higher than the flue temperature of the Comparative Example, and in particular, the average temperature of Y1 to Y7 and Y10 to Y16 of Example 2 was 104 ° C. higher than the average temperature of the Comparative Example. . This result indicates that the combustibility of the flue at each position could be improved by implementing the foreign matter removing method according to the present embodiment. That is, the foreign matter that has blocked the gas flow path of the heat storage chamber is removed by the foreign matter removal method according to the present embodiment, and the state in which the foreign matter is removed is maintained. It is considered that the flammability of
１０ コークス炉
２０ 上部構造
２２ 炭化室
２４ 燃焼室
２６ フリュー
２８ 炉壁レンガ
３０ ビンダーレンガ
４０ 下部構造
４２ 蓄熱室
４４ 下部水平煙道
４６ 小煙道
５０ クロスキャナル
５２ グレートレンガ
５４ 吹かし孔
５６ 上領域
５８ 中領域
６０ 下領域
６２ ギッターレンガ
６４ チェッカーレンガ
７０ 清掃装置
７２ 長尺ノズル
７４ 空気噴出口
８０ 吸引車
８２ 吸引ノズル
10 Coke Oven 20 Superstructure 22 Carbonization chamber 24 Combustion chamber 26 Flue 28 Furnace wall brick 30 Binder brick 40 Lower structure 42 Heat storage chamber 44 Lower horizontal flue 46 Small flue 50 Cross scanner 52 Great brick 54 Blowing hole 56 Upper area 58 Medium Area 60 Lower area 62 Gitter brick 64 Checker brick 70 Cleaning device 72 Long nozzle 74 Air jet 80 Suction wheel 82 Suction nozzle
Claims (3)
蓄熱室の上方の耐火物を解体除去した後に、前記蓄熱室の下方から蓄熱室へ気体を送給して異物を除去する、異物の除去方法。 A method for removing foreign matter from a heat storage chamber in a chamber furnace type coke oven,
A method for removing foreign matter, which comprises removing a refractory material above a heat storage chamber by dismantling and removing the foreign matter, and then supplying gas from below the heat storage chamber to the heat storage chamber to remove foreign matter.
Priority Applications (1)
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