JP5670173B2

JP5670173B2 - Heat recovery equipment

Info

Publication number: JP5670173B2
Application number: JP2010287766A
Authority: JP
Inventors: 中山　道夫; 道夫中山; 能史安部; 佐藤　雅典; 雅典佐藤
Original assignee: Yoshizawa Lime Industry Co Ltd; JP Steel Plantech Co
Current assignee: Yoshizawa Lime Industry Co Ltd; JP Steel Plantech Co
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2015-02-18
Anticipated expiration: 2030-12-24
Also published as: JP2012137197A

Description

本発明は、ロータリーキルンの外周側の熱を回収するための熱回収装置に関する。 The present invention relates to a heat recovery apparatus for recovering heat on the outer peripheral side of a rotary kiln.

セメントや生石灰等を焼成するロータリーキルンとして、円筒状に形成される鋼鉄製の外筒部（鉄皮）と、外筒部に内張りされる耐火物とを備えるロータリーキルンが広く利用されている。ロータリーキルンの外筒部の温度は、４００℃を超す温度となる。そこで、従来、ロータリーキルンの外周側の熱を回収して有効利用するための熱回収装置が提案されている（たとえば、特許文献１参照）。 As a rotary kiln for firing cement, quicklime, or the like, a rotary kiln having a steel outer cylinder part (iron skin) formed in a cylindrical shape and a refractory lined on the outer cylinder part is widely used. The temperature of the outer cylinder part of the rotary kiln is a temperature exceeding 400 ° C. Therefore, conventionally, a heat recovery apparatus has been proposed for recovering and effectively using the heat on the outer peripheral side of the rotary kiln (see, for example, Patent Document 1).

特許文献１記載の熱回収装置は、ロータリーキルンの外筒部の全体を被覆するジャケットカバーを備えている。このジャケットカバーには、空気の導入口と排気口とが形成されている。導入口には、ロータリーキルンの外筒部とジャケットカバーとの間に空気を送り込む送風機が接続され、排気口には、ロータリーキルンの外筒部とジャケットカバーとの間から空気を吸い出す排風機が接続されている。この熱回収装置では、排気口から排出された高温の空気が、ロータリーキルンのバーナーに送り込まれ、バーナーの燃焼用空気として利用されている。 The heat recovery apparatus described in Patent Document 1 includes a jacket cover that covers the entire outer cylinder portion of the rotary kiln. The jacket cover is formed with an air inlet and an exhaust port. A blower that sends air between the outer cylinder of the rotary kiln and the jacket cover is connected to the introduction port, and a blower that sucks air from between the outer cylinder of the rotary kiln and the jacket cover is connected to the exhaust port. ing. In this heat recovery apparatus, high-temperature air discharged from the exhaust port is sent to the burner of the rotary kiln and used as combustion air for the burner.

特開２００６−２９６６７号公報JP 2006-29667 A

一般に、ロータリーキルンの外筒部の温度は、高温の炉内から耐火物を介して伝導される熱と、外筒部の外周面から外部へ放散される熱とによって決定される。また、耐火物の仕様は、炉内温度、耐火物の厚みおよび耐火物の熱伝達率等を考慮して、大気中に配置される外筒部の温度が耐熱温度以下になるように決定されている。そのため、ロータリーキルンの外筒部がジャケットカバーで被覆されていると、ロータリーキルンの外筒部とジャケットカバーとの間を通過する空気の流量によっては、外筒部の外周面から外部へ放散される熱量が減少し、外筒部の温度が上昇して耐熱温度以上となるおそれがある。 Generally, the temperature of the outer cylinder part of a rotary kiln is determined by the heat conducted through a refractory from a high temperature furnace and the heat dissipated to the outside from the outer peripheral surface of the outer cylinder part. In addition, the specifications of the refractory are determined so that the temperature of the outer cylinder portion disposed in the atmosphere is equal to or lower than the heat resistant temperature in consideration of the furnace temperature, the thickness of the refractory, the heat transfer coefficient of the refractory, etc. ing. Therefore, if the outer cylinder part of the rotary kiln is covered with a jacket cover, the amount of heat dissipated to the outside from the outer peripheral surface of the outer cylinder part depending on the flow rate of air passing between the outer cylinder part of the rotary kiln and the jacket cover May decrease, and the temperature of the outer cylinder portion may rise and become higher than the heat resistance temperature.

そこで、本発明の課題は、ロータリーキルンの外周側の熱を回収するための熱回収装置において、ロータリーキルンを構成する外筒部の温度が耐熱温度以上となるのを適切に防止することが可能な熱回収装置を提供することにある。 Accordingly, an object of the present invention is to provide a heat recovery apparatus for recovering heat on the outer peripheral side of the rotary kiln, which is capable of appropriately preventing the temperature of the outer cylinder part constituting the rotary kiln from exceeding the heat resistant temperature. It is to provide a recovery device.

上記の課題を解決するため、本発明の熱回収装置は、円筒状に形成される鋼鉄製の外筒部と、外筒部に内張りされる耐火物とを有するロータリーキルンの外周側の熱を回収するための熱回収装置において、所定の隙間を介して外筒部の外周面を覆う少なくとも１個のカバー部材を備え、カバー部材には、空気の流入口と、流入口から流入し外筒部の外周面とカバー部材との間の隙間を通過した空気が排出される排気口とが形成され、外筒部の長手方向におけるカバー部材の長さは、外筒部の、カバー部材の内側に配置される部分の最大温度と最小温度との差が５０℃以内に収まるように設定され、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、熱回収装置が２個以上のカバー部材を備えている場合、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、カバー部材は、水平方向に分割可能な２個のカバー半体によって構成され、カバー半体は、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように水平方向へ移動可能となっていること、または、２個のカバー半体は、蝶番によって繋がれるとともに、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように蝶番を中心に回動可能となっていることを特徴とする。また、上記の課題を解決するため、本発明の熱回収装置は、円筒状に形成される鋼鉄製の外筒部と、外筒部に内張りされる耐火物とを有するロータリーキルンの外周側の熱を回収するための熱回収装置において、所定の隙間を介して外筒部の外周面を覆う少なくとも１個のカバー部材を備え、カバー部材には、空気の流入口と、流入口から流入し外筒部の外周面とカバー部材との間の隙間を通過した空気が排出される排気口とが形成され、外筒部の長手方向におけるカバー部材の長さは、外筒部の外径の２．５倍以内であり、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、熱回収装置が２個以上のカバー部材を備えている場合、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、カバー部材は、水平方向に分割可能な２個のカバー半体によって構成され、カバー半体は、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように水平方向へ移動可能となっていること、または、２個のカバー半体は、蝶番によって繋がれるとともに、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように蝶番を中心に回動可能となっていることを特徴とする。 In order to solve the above problems, the heat recovery apparatus of the present invention recovers heat on the outer peripheral side of a rotary kiln having a steel outer cylinder part formed in a cylindrical shape and a refractory lined on the outer cylinder part. In the heat recovery apparatus for carrying out, it is provided with the at least 1 cover member which covers the outer peripheral surface of an outer cylinder part through a predetermined | prescribed clearance gap. An exhaust port through which air that has passed through the gap between the outer peripheral surface of the cover member and the cover member is discharged is formed, and the length of the cover member in the longitudinal direction of the outer tube portion is on the inner side of the cover member of the outer tube portion. When the difference between the maximum temperature and the minimum temperature of the portion to be arranged is set to be within 50 ° C., and the heat recovery apparatus includes only one cover member, the outer peripheral surface of the outer cylinder portion and the cover member The flow rate of air passing through the gap between When the heat recovery device is provided with two or more cover members, each cover member, the flow rate of air passing through the gap between the outer peripheral surface and the cover member of the outer cylindrical portion has become adjustable, cover The member is composed of two cover halves that can be divided in the horizontal direction, and the cover half moves in the horizontal direction so that the outer peripheral surface of the portion of the outer cylinder portion that is disposed inside the cover member is exposed. The two cover halves are connected by a hinge, and the outer cylinder is rotated around the hinge so that the outer peripheral surface of the portion disposed inside the cover member is exposed. It is possible to move . In order to solve the above-described problem, the heat recovery apparatus of the present invention is a heat recovery device on the outer peripheral side of a rotary kiln having a steel outer cylinder part formed in a cylindrical shape and a refractory lined on the outer cylinder part. In the heat recovery apparatus for recovering air, at least one cover member that covers the outer peripheral surface of the outer cylinder portion through a predetermined gap is provided, and the cover member flows from the air inlet and the inlet to the outside. An exhaust port through which air that has passed through the gap between the outer peripheral surface of the cylindrical portion and the cover member is discharged is formed, and the length of the cover member in the longitudinal direction of the outer cylindrical portion is 2 of the outer diameter of the outer cylindrical portion. If the heat recovery device is provided with only one cover member, the flow rate of air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted. If the heat recovery device has two or more cover members, The flow rate of air passing through the gap between the outer peripheral surface and the cover member of the outer cylindrical portion has become adjustable, the cover member is constituted by a horizontally dividable two cover halves, The cover half is movable in the horizontal direction so that the outer peripheral surface of the outer cylinder portion disposed inside the cover member is exposed, or the two cover halves are hinged. In addition to being connected, the outer cylindrical portion is rotatable about a hinge so that the outer peripheral surface of the portion disposed inside the cover member is exposed .

一般に、ロータリーキルンでは、外筒部の長手方向の一端側に燃焼用のバーナーが配置され、外筒部の長手方向の他端側に原料の投入口が配置されており、外筒部の長手方向において、外筒部の温度は変動する。本発明では、外筒部の長手方向におけるカバー部材の長さは、外筒部の、カバー部材の内側に配置される部分の最大温度と最小温度との差が５０℃以内に収まるように設定され、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、熱回収装置が２個以上のカバー部材を備えている場合、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっている。または、本発明では、外筒部の長手方向におけるカバー部材の長さは、外筒部の外径の２．５倍以内であり、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、熱回収装置が２個以上のカバー部材を備えている場合、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっている。そのため、外筒部の、カバー部材の内側に配置される部分の温度に応じた適切な流量の空気が外筒部の外周面とカバー部材との間の隙間を流れるように、カバー部材ごとに空気の流量を調整することが可能になる。したがって、本発明では、外筒部の外周面を覆うようにカバー部材が配置されていても、外筒部の長手方向で変動する外筒部の温度の上昇を適切に抑制して、外筒部の温度が耐熱温度以上となるのを適切に防止することが可能になる。 Generally, in a rotary kiln, a burner for combustion is disposed on one end side in the longitudinal direction of the outer cylinder portion, and a raw material inlet is disposed on the other end side in the longitudinal direction of the outer cylinder portion. The temperature of the outer cylinder part fluctuates. In the present invention, the length of the cover member in the longitudinal direction of the outer cylinder portion is set so that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion arranged inside the cover member is within 50 ° C. When the heat recovery device has only one cover member, the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted, and the heat recovery device When two or more cover members are provided, the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder portion and the cover member can be adjusted for each cover member . Alternatively, in the present invention, the length of the cover member in the longitudinal direction of the outer tube portion is within 2.5 times the outer diameter of the outer tube portion, and the heat recovery apparatus includes only one cover member. The flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted, and when the heat recovery device includes two or more cover members, for each cover member, The flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted. For this reason, each cover member is arranged so that air of an appropriate flow rate according to the temperature of the portion of the outer cylinder portion arranged inside the cover member flows through the gap between the outer peripheral surface of the outer cylinder portion and the cover member. It becomes possible to adjust the air flow rate. Therefore, in the present invention, even if the cover member is disposed so as to cover the outer peripheral surface of the outer cylinder portion, the outer cylinder is appropriately suppressed from increasing in temperature in the outer cylinder portion that varies in the longitudinal direction of the outer cylinder portion. It is possible to appropriately prevent the temperature of the portion from exceeding the heat resistance temperature.

また、本願発明者の検討によると、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が増えると、外筒部の温度上昇を抑制することはできるが、外筒部の外周側の熱の回収効率が低下する。本発明では、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっており、熱回収装置が２個以上のカバー部材を備えている場合、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっているため、外筒部の、温度がそれほど高くならない部分では、外筒部の温度が耐熱温度以上とならない範囲で、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量を減らすことが可能になる。したがって、外筒部の、温度がそれほど高くならない部分では、外筒部の温度が耐熱温度以上となるのを防止しつつ、外筒部の外周側の熱の回収効率を高めることが可能になる。 Further, according to the study of the present inventor, when the flow rate of air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member increases, the temperature rise of the outer cylinder part can be suppressed. The heat recovery efficiency on the outer peripheral side of the part is reduced. In the present invention, when the heat recovery device includes only one cover member, the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder portion and the cover member can be adjusted, and the heat recovery device When the device includes two or more cover members, the flow rate of the air passing through the gap between the outer peripheral surface of the outer tube portion and the cover member can be adjusted for each cover member. In the part where the temperature is not so high, the flow rate of air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be reduced as long as the temperature of the outer cylinder part does not exceed the heat resistance temperature. become. Therefore, in the portion of the outer cylinder portion where the temperature is not so high, it is possible to increase the heat recovery efficiency on the outer peripheral side of the outer cylinder portion while preventing the temperature of the outer cylinder portion from exceeding the heat resistance temperature. .

また、本発明では、外筒部の長手方向におけるカバー部材の長さが、外筒部の、複数のカバー部材のそれぞれの内側に配置される部分の最大温度と最小温度との差が５０℃以内に収まるように設定されているため、または、外筒部の長手方向におけるカバー部材の長さが外筒部の外径の２．５倍以内であるため、カバー部材の内側での外筒部の温度の変動量を小さくすることが可能になる。したがって、本発明では、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量調整を容易に行うことが可能になる。また、本発明では、カバー部材は、水平方向に分割可能な２個のカバー半体によって構成され、カバー半体は、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように水平方向へ移動可能となっている、または、２個のカバー半体は、蝶番によって繋がれるとともに、外筒部の、カバー部材の内側に配置される部分の外周面が露出するように蝶番を中心に回動可能となっているため、外筒部の外周面とカバー部材との間の隙間の空気の流れが停止した場合や、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が必要以上に低下した場合であっても、カバー部材を移動させて、外筒部の外周面を露出させることで、外筒部の温度が耐熱温度以上となるのを防止することが可能になる。 In the present invention, the length of the cover member in the longitudinal direction of the outer cylinder portion is such that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion disposed inside each of the plurality of cover members is 50 ° C. Because the length of the cover member in the longitudinal direction of the outer cylinder part is within 2.5 times the outer diameter of the outer cylinder part, so that the outer cylinder inside the cover member It is possible to reduce the fluctuation amount of the temperature of the part. Therefore, in the present invention, it is possible to easily adjust the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member. Further, in the present invention, the cover member is constituted by two cover halves that can be divided in the horizontal direction, and the cover half is exposed at the outer peripheral surface of a portion of the outer cylinder portion that is disposed inside the cover member. So that the two cover halves are connected by a hinge and the outer peripheral surface of the portion of the outer cylinder portion disposed inside the cover member is exposed. Since the air flow in the gap between the outer peripheral surface of the outer cylinder part and the cover member stops or between the outer peripheral surface of the outer cylinder part and the cover member Even when the flow rate of the air passing through the gap is reduced more than necessary, the temperature of the outer cylinder part becomes equal to or higher than the heat-resistant temperature by moving the cover member and exposing the outer peripheral surface of the outer cylinder part. Can be prevented.

本発明において、熱回収装置は、外筒部の長手方向で分割された複数のカバー部材を備えることが好ましい。このように構成すると、外筒部の長手方向におけるカバー部材の長さが、外筒部の、複数のカバー部材のそれぞれの内側に配置される部分の最大温度と最小温度との差が所定範囲内に収まるように設定されている場合であっても、ロータリーキルンの外周側からより多くの熱を回収することが可能になる。なお、本発明では、複数のカバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっているため、外筒部の、複数のカバー部材のそれぞれの内側に配置される部分の温度に応じた適切な流量の空気が外筒部の外周面とカバー部材との間の隙間を流れるように、カバー部材ごとに空気の流量を調整することが可能である。また、複数のカバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整可能となっているため、外筒部の、温度がそれほど高くならない部分では、外筒部の温度が耐熱温度以上とならない範囲で、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量を減らすことが可能である。 In this invention, it is preferable that a heat recovery apparatus is provided with the some cover member divided | segmented by the longitudinal direction of the outer cylinder part. With this configuration, the length of the cover member in the longitudinal direction of the outer cylinder portion is such that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion disposed inside each of the plurality of cover members is within a predetermined range. Even when it is set so as to be within, it becomes possible to recover more heat from the outer peripheral side of the rotary kiln. In the present invention, since the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted for each of the plurality of cover members, the plurality of covers of the outer cylinder part can be adjusted. The air flow rate is adjusted for each cover member so that air of an appropriate flow rate according to the temperature of the portion disposed inside each member flows through the gap between the outer peripheral surface of the outer cylinder portion and the cover member. It is possible. In addition, since the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be adjusted for each of the plurality of cover members, the part of the outer cylinder part where the temperature does not become so high The flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member can be reduced within a range in which the temperature of the outer cylinder part does not exceed the heat resistance temperature.

本発明において、熱回収装置は、複数のカバー部材の排気口に個別に接続される複数の空気吸引手段を備え、空気吸引手段の吸引流量を調整することで、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整されることが好ましい。このように構成すると、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量を比較的容易に制御することが可能になる。 In the present invention, the heat recovery apparatus includes a plurality of air suction means individually connected to the exhaust ports of the plurality of cover members, and adjusts the suction flow rate of the air suction means so that the outer cylinder portion is provided for each cover member. It is preferable that the flow rate of the air passing through the gap between the outer peripheral surface of the cover and the cover member is adjusted. If comprised in this way, it will become possible to control the flow volume of the air which passes the clearance gap between the outer peripheral surface of an outer cylinder part, and a cover member comparatively easily.

本発明では、熱回収装置が１個のみのカバー部材を備えている場合、外筒部の、カバー部材の内側に配置される部分の温度の測定結果に基づいて、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整され、熱回収装置が２個以上のカバー部材を備えている場合、外筒部の、カバー部材の内側に配置される部分の温度の測定結果に基づいて、カバー部材ごとに、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量が調整されることが好ましい。このように構成すると、外筒部の温度が耐熱温度以上となるのを確実に防止することが可能になる。また、このように構成すると、測定された温度が耐熱温度に達していない場合には、外筒部の外周面とカバー部材との間の隙間を通過する空気の流量を減らすことが可能になるため、ロータリーキルンの外周側の熱の回収効率を効果的に高めることが可能になる。 In the present invention, when the heat recovery device includes only one cover member, based on the measurement result of the temperature of the portion of the outer cylinder portion arranged inside the cover member, When the flow rate of air passing through the gap between the cover member is adjusted and the heat recovery device includes two or more cover members, the temperature of the portion of the outer cylinder portion disposed inside the cover member is adjusted . Based on the measurement result, it is preferable that the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder portion and the cover member is adjusted for each cover member. If comprised in this way, it will become possible to prevent reliably that the temperature of an outer cylinder part becomes more than heat-resistant temperature. Further, with this configuration, when the measured temperature does not reach the heat resistant temperature, the flow rate of air passing through the gap between the outer peripheral surface of the outer cylinder portion and the cover member can be reduced. Therefore, it is possible to effectively increase the heat recovery efficiency on the outer peripheral side of the rotary kiln.

本発明において、カバー部材には、たとえば、外筒部の、カバー部材の内側に配置される部分の温度を測定するための温度測定用窓が形成されている。この場合には、たとえば、放射温度計を利用して、外筒部の、カバー部材の内側に配置される部分の温度を測定することが可能になる。 In the present invention, the cover member is formed with, for example, a temperature measurement window for measuring the temperature of a portion of the outer cylinder portion disposed inside the cover member. In this case, for example, using a radiation thermometer, it is possible to measure the temperature of the portion of the outer cylinder portion disposed inside the cover member.

本発明において、カバー部材には、外筒部の、カバー部材の内側に配置される部分の外周面を目視で確認するための覗き窓が形成されていることが好ましい。外筒部に内張りされた耐火物が落下すると、耐火物が落下した箇所では外筒部の温度が急上昇して、外筒部の外周面が赤くなるため、このように構成すると、外筒部の外周面を覆うカバー部材が配置されている場合であっても、外筒部の内周面からの耐火物の落下を目視で発見することが可能になる。 In the present invention, it is preferable that a viewing window for visually confirming an outer peripheral surface of a portion of the outer cylinder portion disposed inside the cover member is formed on the cover member. When the refractory lined on the outer cylinder part falls, the temperature of the outer cylinder part rises suddenly at the place where the refractory falls, and the outer peripheral surface of the outer cylinder part becomes red. Even when a cover member that covers the outer peripheral surface of the outer tube portion is disposed, it is possible to visually detect the fall of the refractory from the inner peripheral surface of the outer cylinder portion.

以上のように、本発明の熱回収装置では、ロータリーキルンを構成する外筒部の温度が耐熱温度以上となるのを適切に防止することが可能になる。 As described above, in the heat recovery apparatus of the present invention, it is possible to appropriately prevent the temperature of the outer cylinder part constituting the rotary kiln from being higher than the heat resistant temperature.

本発明の実施の形態にかかる熱回収装置の構成を説明するための側面図である。It is a side view for demonstrating the structure of the heat recovery apparatus concerning embodiment of this invention. 図１のＥ部の拡大図である。It is an enlarged view of the E section of FIG. 図２のＦ−Ｆ断面の断面図である。It is sectional drawing of the FF cross section of FIG. 図３に示すカバー部材を移動させて外筒部の外周面を露出させた状態の断面図である。It is sectional drawing of the state which moved the cover member shown in FIG. 3, and exposed the outer peripheral surface of the outer cylinder part. 熱回収装置が設置されていないときの外筒部の温度分布の一例を示すグラフである。It is a graph which shows an example of the temperature distribution of an outer cylinder part when the heat recovery apparatus is not installed. 吸引ファンの吸引流量と外筒部の温度との関係、および、吸引ファンの吸引流量と吸引ファンから排出される加熱空気の温度との関係の一例を示すグラフである。It is a graph which shows an example of the relationship between the suction flow rate of a suction fan and the temperature of an outer cylinder part, and the relationship between the suction flow rate of a suction fan and the temperature of the heating air discharged | emitted from a suction fan. 吸引ファンの吸引流量の設定例とその設定例に基づく外筒部の温度等の測定結果を示す一覧表である。It is a table | surface which shows the measurement result, such as the temperature of an outer cylinder part based on the setting example of the suction flow rate of a suction fan, and the setting example.

以下、図面を参照しながら、本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（ロータリーキルンおよび熱回収装置の構成）
図１は、本発明の実施の形態にかかる熱回収装置１の構成を説明するための側面図である。図２は、図１のＥ部の拡大図である。図３は、図２のＦ−Ｆ断面の断面図である。図４は、図３に示すカバー部材８を移動させて外筒部４の外周面４ｃを露出させた状態の断面図である。図５は、熱回収装置１が設置されていないときの外筒部４の温度分布の一例を示すグラフである。 (Configuration of rotary kiln and heat recovery device)
FIG. 1 is a side view for explaining the configuration of a heat recovery apparatus 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion E in FIG. 3 is a cross-sectional view taken along the line FF in FIG. 4 is a cross-sectional view showing a state in which the outer peripheral surface 4c of the outer cylinder portion 4 is exposed by moving the cover member 8 shown in FIG. FIG. 5 is a graph showing an example of the temperature distribution of the outer cylinder portion 4 when the heat recovery apparatus 1 is not installed.

本形態の熱回収装置１は、ロータリーキルン２の外周側の熱を回収するための装置である。ロータリーキルン２は、セメント、生石灰あるいはセラミックス等の被焼成物３（図３参照）を焼成するための回転式の炉である。 The heat recovery apparatus 1 of this embodiment is an apparatus for recovering heat on the outer peripheral side of the rotary kiln 2. The rotary kiln 2 is a rotary furnace for firing an object to be fired 3 (see FIG. 3) such as cement, quicklime or ceramics.

ロータリーキルン２は、長尺の円筒状に形成される鋼鉄製の外筒部（鉄皮）４と、外筒部４に内張りされた耐火レンガ等の耐火物５とを備えている。外筒部４の一端４ａ側には、被焼成物３の原料が投入される原料投入部６が取り付けられている。外筒部４の他端４ｂ側には、被焼成物３の排出口が形成されるとともに、焼成用のバーナー（図示省略）が取り付けられている。バーナーは、外筒部４の一端４ａ側に向かって燃料を噴射する。 The rotary kiln 2 includes a steel outer cylinder portion (iron skin) 4 formed in a long cylindrical shape, and a refractory material 5 such as a refractory brick lined on the outer cylinder portion 4. On the one end 4a side of the outer cylinder part 4, a raw material charging part 6 into which the raw material of the material to be fired 3 is charged is attached. On the other end 4 b side of the outer cylinder portion 4, a discharge port for the object to be fired 3 is formed, and a burner (not shown) for firing is attached. The burner injects fuel toward the one end 4 a side of the outer cylinder portion 4.

外筒部４の外周面４ｃには、外筒部４の長手方向を回転軸の方向として外筒部４を回転させる回転駆動機構（図示省略）が連結されている。また、外筒部４の外周面４ｃには、図示を省略する複数のドラムタイヤが所定のピッチで取り付けられており、このドラムタイヤは、図示を省略するローラによって回転可能に支持されている。外筒部４は、一端４ａが他端４ｂよりもわずかに高くなるように傾斜した状態でローラに支持されている。 The outer peripheral surface 4c of the outer cylinder part 4 is connected to a rotation drive mechanism (not shown) that rotates the outer cylinder part 4 with the longitudinal direction of the outer cylinder part 4 as the direction of the rotation axis. A plurality of drum tires (not shown) are attached to the outer peripheral surface 4c of the outer cylinder portion 4 at a predetermined pitch, and the drum tires are rotatably supported by rollers (not shown). The outer cylinder portion 4 is supported by the roller in an inclined state so that the one end 4a is slightly higher than the other end 4b.

ロータリーキルン２では、原料投入部６から投入された原料は、外筒部４の回転動作に伴って外筒部４内で回転しながら、外筒部４の一端４ａから他端４ｂまで送られる。また、外筒部４の他端４ｂまで送られる過程で、原料は焼成されて被焼成物３となり、被焼成物３は、外筒部４の他端４ｂに形成される排出口から排出される。 In the rotary kiln 2, the raw material charged from the raw material charging portion 6 is sent from one end 4 a to the other end 4 b of the outer cylinder portion 4 while rotating in the outer cylinder portion 4 as the outer cylinder portion 4 rotates. In addition, in the process of being sent to the other end 4 b of the outer cylinder portion 4, the raw material is baked to become an object to be fired 3, and the object to be fired 3 is discharged from a discharge port formed at the other end 4 b of the outer cylinder portion 4. The

上述のように、ロータリーキルン２では、外筒部４の一端４ａ側に原料投入部６が取り付けられ、外筒部４の他端４ｂ側にバーナーが取り付けられているため、外筒部４の長手方向において、外筒部４の温度は変動する。たとえば、外筒部４の長さＬ１（図１参照）が５５（ｍ）であり、外筒部４の外径Ｄ（図２参照）が３．２５（ｍ）である場合に、外筒部４の一端４ａからの距離と外筒部４の温度との関係を測定すると、図５のようになる。すなわち、ロータリーキルン２では、バーナーが配置される外筒部４の他端４ｂ側の温度が高くなり、原料が投入される外筒部４の一端４ａ側の温度が低くなっている。 As described above, in the rotary kiln 2, the raw material charging portion 6 is attached to the one end 4 a side of the outer cylinder portion 4 and the burner is attached to the other end 4 b side of the outer cylinder portion 4. In the direction, the temperature of the outer cylinder portion 4 varies. For example, when the length L1 (see FIG. 1) of the outer cylinder portion 4 is 55 (m) and the outer diameter D (see FIG. 2) of the outer cylinder portion 4 is 3.25 (m), the outer cylinder When the relationship between the distance from the one end 4a of the part 4 and the temperature of the outer cylinder part 4 is measured, it is as shown in FIG. That is, in the rotary kiln 2, the temperature on the other end 4b side of the outer cylinder part 4 where the burner is arranged is high, and the temperature on the one end 4a side of the outer cylinder part 4 into which the raw material is charged is low.

熱回収装置１は、外筒部４の長手方向で分割された複数のカバー部材８を備えている。カバー部材８は、鋼鉄と断熱材料とで形成されている。また、カバー部材８は、略円筒状に形成されており、図３に示すように、所定の隙間Ｓを介して外筒部４の外周面４ｃを覆っている。すなわち、外筒部４の外周面４ｃとカバー部材８の内周面との間には、円筒状の隙間Ｓが形成されている。複数のカバー部材８は、図１に示すように、互いに所定の間隔をあけた状態で、外筒部４の長手方向に沿って配置されている。なお、複数のカバー部材８の間には、上述の回転駆動機構を構成するギアやドラムタイヤ等が配置されている。 The heat recovery apparatus 1 includes a plurality of cover members 8 divided in the longitudinal direction of the outer cylinder portion 4. The cover member 8 is made of steel and a heat insulating material. Further, the cover member 8 is formed in a substantially cylindrical shape, and covers the outer peripheral surface 4c of the outer cylinder portion 4 via a predetermined gap S as shown in FIG. That is, a cylindrical gap S is formed between the outer peripheral surface 4 c of the outer cylinder portion 4 and the inner peripheral surface of the cover member 8. As shown in FIG. 1, the plurality of cover members 8 are arranged along the longitudinal direction of the outer cylinder portion 4 with a predetermined interval therebetween. Note that gears, drum tires, and the like that constitute the rotational drive mechanism described above are disposed between the plurality of cover members 8.

外筒部４の長手方向におけるカバー部材８の長さＬ２（図２参照）は、外筒部４の長さＬ１よりも短くなっている。具体的には、カバー部材８の長さＬ２は、外筒部４の、複数のカバー部材８のそれぞれの内周側に配置される部分の最大温度と最小温度の差が所定範囲内に収まるように設定されている。たとえば、外筒部４の温度分布が図５に示す温度分布となるロータリーキルン２の場合には、矢印Ｖ１〜Ｖ５で示す５箇所にカバー部材８が配置されており、外筒部４の、５個のカバー部材８のそれぞれの内周側に配置される部分の最大温度と最小温度の差（たとえば、外筒部４の、矢印Ｖ１で示す箇所に設置されるカバー部材８の内周側に配置される部分の最大温度と最小温度の差）が５０（℃）以内となるように、カバー部材８の長さＬ２は、外筒部４の外径Ｄの２．５倍以内に設定されている。具体的には、たとえば、カバー部材８の長さＬ２は、５（ｍ）に設定されている。なお、全てのカバー部材８の長さＬ２が同じであっても良いし、長さＬ２が他のカバー部材８と異なるカバー部材８があっても良い。 The length L2 (see FIG. 2) of the cover member 8 in the longitudinal direction of the outer cylinder part 4 is shorter than the length L1 of the outer cylinder part 4. Specifically, the length L2 of the cover member 8 is such that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of each of the plurality of cover members 8 is within a predetermined range. Is set to For example, in the case of the rotary kiln 2 in which the temperature distribution of the outer cylinder portion 4 is the temperature distribution shown in FIG. 5, the cover members 8 are arranged at five locations indicated by arrows V1 to V5. The difference between the maximum temperature and the minimum temperature of the portions arranged on the inner peripheral side of each of the cover members 8 (for example, on the inner peripheral side of the cover member 8 installed at the location indicated by the arrow V1 of the outer cylinder portion 4 The length L2 of the cover member 8 is set within 2.5 times the outer diameter D of the outer cylinder portion 4 so that the difference between the maximum temperature and the minimum temperature of the portion to be arranged is within 50 (° C.). ing. Specifically, for example, the length L2 of the cover member 8 is set to 5 (m). Note that the length L2 of all the cover members 8 may be the same, or there may be a cover member 8 having a length L2 different from that of the other cover members 8.

カバー部材８は、水平方向に分割可能な略半円筒状の２個のカバー半体９、１０によって構成されている。カバー半体９とカバー半体１０との境界部分には、図３に示すように、空気の流入口８ａと、空気の排気口８ｂとが形成されている。具体的には、カバー部材８の下端に配置されるカバー半体９とカバー半体１０との境界部分に流入口８ａが形成され、カバー部材８の上端に配置されるカバー半体９とカバー半体１０との境界部分に排気口８ｂが形成されている。 The cover member 8 is configured by two substantially half-cylindrical cover halves 9 and 10 that can be divided in the horizontal direction. As shown in FIG. 3, an air inlet 8a and an air outlet 8b are formed at the boundary between the cover half 9 and the cover half 10. Specifically, an inflow port 8 a is formed at the boundary between the cover half 9 and the cover half 10 disposed at the lower end of the cover member 8, and the cover half 9 and the cover disposed at the upper end of the cover member 8. An exhaust port 8 b is formed at the boundary with the half body 10.

カバー部材８の上端側には、ダクト１１の一部が取り付けられている。具体的には、ダクト１１の内部が排気口８ｂに連通するように、カバー部材８の上端側にダクト１１の一部が取り付けられている。ダクト１１には、空気吸引手段としての吸引ファン１２の吸入側が接続されている。すなわち、排気口８ｂには、ダクト１１を介して吸引ファン１２が接続されている。 A part of the duct 11 is attached to the upper end side of the cover member 8. Specifically, a part of the duct 11 is attached to the upper end side of the cover member 8 so that the inside of the duct 11 communicates with the exhaust port 8b. The duct 11 is connected to the suction side of a suction fan 12 as air suction means. That is, the suction fan 12 is connected to the exhaust port 8b through the duct 11.

吸引ファン１２が駆動すると、流入口８ａから空気（大気）が流入する。流入口８ａから流入した空気は、隙間Ｓを通過しながら、外筒部４から放散される熱を吸収して加熱空気となり、排気口８ｂから排出される。排気口８ｂから排出され、ダクト１１を通過した加熱空気は、加熱空気の利用先に向かって吸引ファン１２から排出される。 When the suction fan 12 is driven, air (atmosphere) flows from the inlet 8a. The air flowing in from the inflow port 8a absorbs the heat dissipated from the outer cylinder part 4 while passing through the gap S, becomes heated air, and is discharged from the exhaust port 8b. The heated air discharged from the exhaust port 8b and passing through the duct 11 is discharged from the suction fan 12 toward the usage destination of the heated air.

カバー半体９の下端側には、外筒部４の、カバー部材８の内周側に配置される部分の温度を測定するための温度測定用窓９ａが形成されている。温度測定用窓９ａは、図２に示すように、外筒部４の長手方向に細長いスリット状に形成されるとともに、外筒部４の長手方向におけるカバー半体９の略全域に形成されている。本形態では、放射温度計によって、外筒部４の、カバー部材８の内周側に配置される部分の温度が測定される。 On the lower end side of the cover half body 9, a temperature measurement window 9 a for measuring the temperature of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 is formed. As shown in FIG. 2, the temperature measuring window 9 a is formed in a slit shape elongated in the longitudinal direction of the outer cylinder portion 4, and is formed in substantially the entire area of the cover half body 9 in the longitudinal direction of the outer cylinder portion 4. Yes. In this embodiment, the temperature of the portion arranged on the inner peripheral side of the cover member 8 of the outer cylinder portion 4 is measured by the radiation thermometer.

カバー半体１０には、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃを目視で確認するための覗き窓１０ａが形成されている。覗き窓１０ａは、温度測定用窓９ａと同様に、外筒部４の長手方向に細長いスリット状に形成されるとともに、外筒部４の長手方向におけるカバー半体１０の略全域に形成されている。 The cover half 10 is formed with a viewing window 10a for visually confirming the outer peripheral surface 4c of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8. Similar to the temperature measurement window 9a, the observation window 10a is formed in the shape of a long and narrow slit in the longitudinal direction of the outer cylinder portion 4, and is formed in substantially the entire area of the cover half body 10 in the longitudinal direction of the outer cylinder portion 4. Yes.

カバー半体９、１０は、支持部材１３に支持されている。また、支持部材１３の下端は、台車１４に固定されている。図４に示すように、本形態では、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃが露出するように、カバー半体９、１０は、水平方向へ移動可能となっている。具体的には、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃが露出するように、台車１４と一緒にカバー半体９、１０が互いに離れる方向へ移動可能となっている。 The cover halves 9 and 10 are supported by the support member 13. The lower end of the support member 13 is fixed to the carriage 14. As shown in FIG. 4, in this embodiment, the cover halves 9, 10 are moved in the horizontal direction so that the outer peripheral surface 4 c of the portion disposed on the inner peripheral side of the cover member 8 of the outer cylinder portion 4 is exposed. It is movable. Specifically, the cover halves 9 and 10 move in a direction away from each other together with the carriage 14 so that the outer peripheral surface 4c of the portion disposed on the inner peripheral side of the cover member 8 of the outer cylinder portion 4 is exposed. It is possible.

上述のように、カバー部材８ごとにダクト１１を介して吸引ファン１２が接続されているため、本形態では、個々の吸引ファン１２の吸引流量を調整することで、カバー部材８ごとに、排気口８ｂからの空気の排出量を調整することが可能である。すなわち、本形態では、個々の吸引ファン１２の吸引流量を調整することで、カバー部材８ごとに、隙間Ｓを通過する空気の流量を調整することが可能である。また、本形態では、温度測定用窓９ａから測定される外筒部４の、カバー部材８の内周側に配置される部分の温度に基づいて、個々の吸引ファン１２の吸引流量が調整されて、カバー部材８ごとに隙間Ｓを通過する空気の流量が調整される。 As described above, since the suction fan 12 is connected to each cover member 8 via the duct 11, in the present embodiment, the exhaust flow rate of each suction fan 12 is adjusted to exhaust the cover member 8. It is possible to adjust the amount of air discharged from the port 8b. That is, in this embodiment, the flow rate of air passing through the gap S can be adjusted for each cover member 8 by adjusting the suction flow rate of each suction fan 12. Further, in this embodiment, the suction flow rate of each suction fan 12 is adjusted based on the temperature of the portion of the outer cylinder portion 4 that is measured from the temperature measurement window 9a and disposed on the inner peripheral side of the cover member 8. Thus, the flow rate of the air passing through the gap S is adjusted for each cover member 8.

（吸引ファンの吸引流量の設定例）
図６は、吸引ファン１２の吸引流量と外筒部４の温度との関係、および、吸引ファン１２の吸引流量と吸引ファン１２から排出される加熱空気の温度との関係の一例を示すグラフである。図７は、吸引ファン１２の吸引流量の設定例とその設定例に基づく外筒部４の温度等の測定結果を示す一覧表である。 (Setting example of suction fan suction flow rate)
FIG. 6 is a graph showing an example of the relationship between the suction flow rate of the suction fan 12 and the temperature of the outer cylinder portion 4, and the relationship between the suction flow rate of the suction fan 12 and the temperature of the heated air discharged from the suction fan 12. is there. FIG. 7 is a list showing a setting example of the suction flow rate of the suction fan 12 and measurement results such as the temperature of the outer cylinder portion 4 based on the setting example.

たとえば、外筒部４の外径Ｄが３．２５（ｍ）である場合に、長さＬ２が５（ｍ）であり、かつ、内径が３．４（ｍ）である（すなわち、外筒部４の外周面４ｃとカバー部材８の内周面との距離が７５（ｍｍ）である）カバー部材８を外筒部４の外周側に設置して、吸引ファン１２の吸引流量を変化させたときの、吸引ファン１２の吸引流量と外筒部４の温度との関係、および、吸引ファン１２の吸引流量と吸引ファン１２から排出される加熱空気の温度との関係を計算で求めると、図６のようになる。 For example, when the outer diameter D of the outer cylinder portion 4 is 3.25 (m), the length L2 is 5 (m) and the inner diameter is 3.4 (m) (that is, the outer cylinder The distance between the outer peripheral surface 4c of the portion 4 and the inner peripheral surface of the cover member 8 is 75 (mm). The cover member 8 is installed on the outer peripheral side of the outer cylindrical portion 4, and the suction flow rate of the suction fan 12 is changed. When calculating the relationship between the suction flow rate of the suction fan 12 and the temperature of the outer cylinder part 4 and the relationship between the suction flow rate of the suction fan 12 and the temperature of the heated air discharged from the suction fan 12, As shown in FIG.

図６に示すように、吸引ファン１２の吸引流量を増やしていくと、カバー部材８の内周側に配置される外筒部４の温度は低くなっていき、また、吸引ファン１２から排出される加熱空気の温度も低くなっていく。すなわち、吸引ファン１２の吸引流量を減らしていくと、カバー部材８の内周側に配置される外筒部４の温度および吸引ファン１２から排出される加熱空気の温度は高くなっていく。なお、この計算では、カバー部材８が設置されていないときの外筒部４の温度を４２０（℃）、外気の温度を２５（℃）としており、カバー部材８が設置されたときのカバー部材８の内周側の外筒部４の温度を４２０（℃）で維持するために必要な吸引ファン１２の吸引流量は、１３０００ｍ^３Ｎ／ｈとなる。 As shown in FIG. 6, when the suction flow rate of the suction fan 12 is increased, the temperature of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 becomes lower and is discharged from the suction fan 12. The temperature of the heated air is getting lower. That is, as the suction flow rate of the suction fan 12 is decreased, the temperature of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 and the temperature of the heated air discharged from the suction fan 12 are increased. In this calculation, the temperature of the outer cylinder portion 4 when the cover member 8 is not installed is 420 (° C.), the temperature of the outside air is 25 (° C.), and the cover member when the cover member 8 is installed. The suction flow rate of the suction fan 12 required to maintain the temperature of the outer cylinder portion 4 on the inner peripheral side of 8 at 420 (° C.) is 13000 m ³ N / h.

以下、長さＬ１が５５（ｍ）、外径Ｄが３．２５（ｍ）であり、かつ、外筒部４の温度分布が図５に示す温度分布となるロータリーキルン２に熱回収装置１を設置したときの、吸引ファン１２の吸引流量の設定例と、その設定例に基づく外筒部４の温度等の測定結果を図７を参照しながら説明する。この測定では、矢印Ｖ１〜Ｖ５で示す５箇所にカバー部材８を設置した。また、この測定で用いた外筒部４の耐熱温度は、４５０℃程度である。 Hereinafter, the heat recovery apparatus 1 is attached to the rotary kiln 2 in which the length L1 is 55 (m), the outer diameter D is 3.25 (m), and the temperature distribution of the outer cylinder portion 4 is the temperature distribution shown in FIG. A setting example of the suction flow rate of the suction fan 12 when installed and a measurement result such as the temperature of the outer cylinder portion 4 based on the setting example will be described with reference to FIG. In this measurement, cover members 8 were installed at five locations indicated by arrows V1 to V5. Moreover, the heat-resistant temperature of the outer cylinder part 4 used by this measurement is about 450 degreeC.

なお、図７における「熱回収前外筒部温度」とは、熱回収装置１が設置されていないときのカバー部材８の各設置予定位置における外筒部４の温度である。また、図７における「熱回収後外筒部温度」とは、熱回収装置１を設置して吸引ファン１２を駆動したときのカバー部材８の各設置位置における外筒部４の温度であり、「熱回収後加熱空気温度」とは、各設置位置に設置されたカバー部材８のそれぞれに接続された吸引ファン１２から排出される加熱空気の温度である。 7 is the temperature of the outer cylinder portion 4 at each planned installation position of the cover member 8 when the heat recovery apparatus 1 is not installed. 7 is the temperature of the outer cylinder portion 4 at each installation position of the cover member 8 when the heat recovery device 1 is installed and the suction fan 12 is driven. The “heated air temperature after heat recovery” is the temperature of the heated air discharged from the suction fan 12 connected to each cover member 8 installed at each installation position.

熱回収前外筒部温度が耐熱温度に近い矢印Ｖ２で示す位置に設置されたカバー部材８に接続される吸引ファン１２では、外筒部４の温度上昇を抑制するため、その吸引流量を増やす必要がある。そのため、図７に示すように、この吸引ファン１２の吸引流量は高く設定されており、その結果、この設置位置では、外筒部４の温度上昇を抑制して、外筒部４の温度を耐熱温度以下に抑えることはできたが、吸引ファン１２から排出される加熱空気の温度は低下した。 In the suction fan 12 connected to the cover member 8 installed at the position indicated by the arrow V2 where the outer cylinder part temperature before heat recovery is close to the heat resistance temperature, the suction flow rate is increased in order to suppress the temperature rise of the outer cylinder part 4. There is a need. Therefore, as shown in FIG. 7, the suction flow rate of the suction fan 12 is set high. As a result, in this installation position, the temperature rise of the outer cylinder part 4 is suppressed and the temperature of the outer cylinder part 4 is reduced. Although the temperature could be kept below the heat-resistant temperature, the temperature of the heated air discharged from the suction fan 12 decreased.

これに対して、熱回収前外筒部温度が矢印Ｖ２で示す位置よりも低い矢印Ｖ１、Ｖ３で示す位置に設置されたカバー部材８に接続される吸引ファン１２では、外筒部４の温度が耐熱温度以上にならない程度まで、その吸引流量を減らすことができる。そのため、この設置位置では、外筒部４の温度を耐熱温度以下に抑えつつ、吸引ファン１２から排出される加熱空気の温度を高めることができた。 On the other hand, in the suction fan 12 connected to the cover member 8 installed at the positions indicated by the arrows V1 and V3 where the temperature of the outer cylinder before heat recovery is lower than the position indicated by the arrow V2, the temperature of the outer cylinder 4 The suction flow rate can be reduced to the extent that does not exceed the heat-resistant temperature. Therefore, at this installation position, the temperature of the heated air discharged from the suction fan 12 could be increased while keeping the temperature of the outer cylinder portion 4 below the heat resistance temperature.

また、熱回収前外筒部温度がさらに低い矢印Ｖ４、Ｖ５で示す位置に設置されたカバー部材８に接続される吸引ファン１２では、その吸引流量を大幅に減らすことができる。そのため、この設置位置では、熱回収前外筒部温度が低いにもかかわらず、吸引ファン１２から排出される加熱空気の温度を高めることができた。 Further, in the suction fan 12 connected to the cover member 8 installed at the position indicated by the arrows V4 and V5 where the outer cylinder part temperature before heat recovery is lower, the suction flow rate can be greatly reduced. Therefore, at this installation position, the temperature of the heated air discharged from the suction fan 12 was able to be increased despite the low temperature of the outer cylinder before heat recovery.

（本形態の主な効果）
以上説明したように、本形態では、カバー部材８ごとにダクト１１を介して吸引ファン１２が接続されており、個々の吸引ファン１２の吸引流量を調整することで、カバー部材８ごとに、排気口８ｂからの空気の排出量を調整することが可能となっている。そのため、たとえば、図５に示すように、外筒部４の温度はその長手方向において変動するが、各カバー部材８の内周側に配置される外筒部４の温度に応じた適切な流量の空気が隙間Ｓを流れるように、カバー部材８ごとに空気の流量を調整することが可能になる。したがって、本形態では、外筒部４の外周面４ｃを覆うようにカバー部材８が配置されていても、外筒部４の長手方向で変動する外筒部４の温度の上昇を適切に抑制して、外筒部４の温度が耐熱温度以上となるのを適切に防止することが可能になる。 (Main effects of this form)
As described above, in this embodiment, the suction fan 12 is connected to each cover member 8 via the duct 11, and the exhaust flow rate of each suction fan 12 is adjusted so that the exhaust gas is exhausted to each cover member 8. It is possible to adjust the amount of air discharged from the port 8b. Therefore, for example, as shown in FIG. 5, the temperature of the outer cylinder portion 4 varies in the longitudinal direction, but an appropriate flow rate according to the temperature of the outer cylinder portion 4 disposed on the inner peripheral side of each cover member 8. It is possible to adjust the air flow rate for each cover member 8 so that the air flows through the gap S. Therefore, in this embodiment, even if the cover member 8 is disposed so as to cover the outer peripheral surface 4 c of the outer cylinder portion 4, the temperature increase of the outer cylinder portion 4 that fluctuates in the longitudinal direction of the outer cylinder portion 4 is appropriately suppressed. And it becomes possible to prevent appropriately that the temperature of the outer cylinder part 4 becomes more than heat-resistant temperature.

また、本形態では、カバー部材８ごとに隙間Ｓを流れる空気の流量を調整することが可能となっているため、外筒部４の、温度がそれほど高くならない部分では、外筒部４の温度が耐熱温度以上とならない範囲で、隙間Ｓを通過する空気の流量を減らすことが可能になる。したがって、外筒部４の、温度がそれほど高くならない部分では、吸引ファン１２の吸引流量を減らすことで、たとえば、図６に示すように、吸引ファン１２から排出される加熱空気の温度を高めることができ、その結果、外筒部４の温度が耐熱温度以上となるのを防止しつつ、外筒部４の外周側の熱の回収効率を高めることが可能になる。たとえば、図７に示すように、矢印Ｖ１、Ｖ３〜Ｖ５で示すカバー部材８の設置位置では、外筒部４の温度が耐熱温度以上となるのを防止しつつ、外筒部４の外周側の熱の回収効率を高めることができる。 Further, in this embodiment, since the flow rate of the air flowing through the gap S can be adjusted for each cover member 8, the temperature of the outer cylinder portion 4 is the portion of the outer cylinder portion 4 where the temperature is not so high. As a result, the flow rate of air passing through the gap S can be reduced within a range where the temperature does not exceed the heat resistant temperature. Accordingly, in the portion of the outer cylinder portion 4 where the temperature does not become so high, the temperature of the heated air discharged from the suction fan 12 is increased by reducing the suction flow rate of the suction fan 12, for example, as shown in FIG. As a result, it is possible to increase the heat recovery efficiency on the outer peripheral side of the outer cylinder part 4 while preventing the temperature of the outer cylinder part 4 from exceeding the heat resistance temperature. For example, as shown in FIG. 7, at the installation position of the cover member 8 indicated by arrows V <b> 1 and V <b> 3 to V <b> 5, while preventing the temperature of the outer cylinder part 4 from exceeding the heat resistant temperature, The heat recovery efficiency can be increased.

本形態では、カバー部材８の長さＬ２は、外筒部４の、複数のカバー部材８のそれぞれの内周側に配置される部分の最大温度と最小温度の差が所定範囲内に収まるように設定されている。そのため、本形態では、それぞれのカバー部材８の内周側での外筒部４の温度の変動量を小さくすることが可能になり、その結果、隙間Ｓを通過する空気の流量調整を容易に行うことが可能になる。なお、外筒部４の、複数のカバー部材８のそれぞれの内周側に配置される部分の最大温度と最小温度の差は、吸引ファン１２の吸引流量の調整によって、外筒部４の温度が耐熱温度以上となるのを防止しつつ、外筒部４の外周側の熱の回収効率を効果的に高めることが可能となるような範囲に収められていることが好ましい。 In this embodiment, the length L2 of the cover member 8 is set so that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion 4 arranged on the inner peripheral side of each of the plurality of cover members 8 is within a predetermined range. Is set to Therefore, in this embodiment, it becomes possible to reduce the amount of fluctuation of the temperature of the outer cylinder portion 4 on the inner peripheral side of each cover member 8, and as a result, the flow rate of the air passing through the gap S can be easily adjusted. It becomes possible to do. The difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion 4 arranged on the inner peripheral side of each of the plurality of cover members 8 is the temperature of the outer cylinder portion 4 by adjusting the suction flow rate of the suction fan 12. It is preferable to be within a range that can effectively increase the heat recovery efficiency on the outer peripheral side of the outer cylinder part 4 while preventing the temperature from exceeding the heat-resistant temperature.

本形態では、熱回収装置１は、外筒部４の長手方向で分割された複数のカバー部材８を備えている。そのため、カバー部材８の長さＬ２が、外筒部４のカバー部材８の内周側に配置される部分の最大温度と最小温度の差が所定範囲内に収まるように設定されていても、ロータリーキルン２の外周側からより多くの熱を回収することが可能になる。 In this embodiment, the heat recovery apparatus 1 includes a plurality of cover members 8 divided in the longitudinal direction of the outer cylinder portion 4. Therefore, even if the length L2 of the cover member 8 is set so that the difference between the maximum temperature and the minimum temperature of the portion disposed on the inner peripheral side of the cover member 8 of the outer cylinder portion 4 is within a predetermined range, More heat can be recovered from the outer peripheral side of the rotary kiln 2.

本形態では、温度測定用窓９ａから測定される外筒部４の、カバー部材８の内周側に配置される部分の温度に基づいて、個々の吸引ファン１２の吸引流量が調整されて、カバー部材８ごとに隙間Ｓを通過する空気の流量が調整されている。そのため、カバー部材８ごとに隙間Ｓを通過する空気の流量をより適切に調整して、外筒部４の温度が耐熱温度以上となるのを確実に防止することが可能になる。また、測定された温度が耐熱温度に達していない場合には、隙間Ｓを通過する空気の流量を減らすことができるため、外筒部４の外周側の熱の回収効率を効果的に高めることが可能になる。 In this embodiment, the suction flow rate of each suction fan 12 is adjusted based on the temperature of the portion of the outer cylinder portion 4 measured from the temperature measurement window 9a, which is disposed on the inner peripheral side of the cover member 8. The flow rate of air passing through the gap S is adjusted for each cover member 8. Therefore, the flow rate of the air passing through the gap S for each cover member 8 can be adjusted more appropriately to reliably prevent the temperature of the outer cylinder portion 4 from reaching the heat resistant temperature or higher. Further, when the measured temperature does not reach the heat resistant temperature, the flow rate of the air passing through the gap S can be reduced, so that the heat recovery efficiency on the outer peripheral side of the outer cylinder portion 4 is effectively increased. Is possible.

本形態では、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃが露出するように、カバー半体９、１０が水平方向へ移動可能となっている。そのため、たとえば、隙間Ｓの空気の流れが停止した場合や隙間Ｓを通過する空気の流量が必要以上に低下した場合であっても、カバー半体９、１０を移動させて、外筒部４の外周面４ｃを露出させることで、外筒部４の温度が耐熱温度以上となるのを防止することが可能になる。 In this embodiment, the cover halves 9 and 10 are movable in the horizontal direction so that the outer peripheral surface 4c of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 is exposed. Therefore, for example, even when the air flow in the gap S is stopped or the flow rate of the air passing through the gap S is unnecessarily lowered, the cover halves 9 and 10 are moved to move the outer cylinder portion 4. By exposing the outer peripheral surface 4c, it is possible to prevent the temperature of the outer cylinder portion 4 from exceeding the heat resistance temperature.

本形態では、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃを目視で確認するための覗き窓１０ａがカバー半体１０に形成されている。外筒部４に内張りされた耐火物５が落下すると、耐火物５が落下した箇所では外筒部４の温度が急上昇して外周面４ｃが赤くなるため、本形態では、外筒部４の外周面４ｃの一部を覆うカバー部材８が配置されている場合であっても、外筒部４の内周面からの耐火物５の落下を目視で発見することが可能になる。 In this embodiment, a viewing window 10a for visually confirming the outer peripheral surface 4c of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 is formed in the cover half body 10. When the refractory 5 lined on the outer cylinder part 4 falls, the temperature of the outer cylinder part 4 suddenly rises at the place where the refractory 5 falls and the outer peripheral surface 4c becomes red. Even when the cover member 8 covering a part of the outer peripheral surface 4c is arranged, it is possible to visually detect the fall of the refractory 5 from the inner peripheral surface of the outer cylinder portion 4.

（他の実施の形態）
上述した形態では、熱回収装置１は、複数のカバー部材８を備えているが、熱回収装置１が備えるカバー部材８の数は、１個であっても良い。この場合であっても、上述した形態と同様の効果を得ることができる。 (Other embodiments)
In the form mentioned above, although the heat recovery apparatus 1 is provided with the some cover member 8, the number of the cover members 8 with which the heat recovery apparatus 1 is provided may be one. Even in this case, the same effect as that of the above-described embodiment can be obtained.

上述した形態では、台車１４に載置されたカバー半体９、１０が互いに離れる方向へ水平移動すると、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃが露出するが、たとえば、蝶番によって繋がれたカバー半体９とカバー半体１０とがこの蝶番を中心に回動すると、外筒部４の、カバー部材８の内周側に配置される部分の外周面４ｃが露出するように、カバー部材８等が構成されても良い。 In the embodiment described above, when the cover halves 9 and 10 placed on the carriage 14 move horizontally in a direction away from each other, the outer peripheral surface 4c of the portion of the outer cylinder portion 4 disposed on the inner peripheral side of the cover member 8 is For example, when the cover half 9 and the cover half 10 connected by a hinge are rotated around the hinge, the portion of the outer cylinder portion 4 arranged on the inner peripheral side of the cover member 8 is exposed. The cover member 8 or the like may be configured so that the outer peripheral surface 4c is exposed.

上述した形態では、複数のカバー部材８の排気口８ｂに個別に吸引ファン１２が接続されており、個々の吸引ファン１２の吸引流量を調整することで、カバー部材８ごとに、排気口８ｂからの空気の排出量が調整されている。この他にもたとえば、複数のカバー部材８の排気口８ｂに共通の吸引ファン１２が接続されるとともに、複数のカバー部材８の排気口８ｂのそれぞれと吸引ファン１２との間に流量調整弁等の流量調整手段が配置され、この流量調整手段での流量調整によって、カバー部材８ごとに、排気口８ｂからの空気の排出量が調整されても良い。 In the embodiment described above, the suction fans 12 are individually connected to the exhaust ports 8 b of the plurality of cover members 8, and by adjusting the suction flow rate of each suction fan 12, for each cover member 8, from the exhaust ports 8 b. The amount of air discharged is adjusted. In addition, for example, a common suction fan 12 is connected to the exhaust ports 8 b of the plurality of cover members 8, and a flow rate adjusting valve or the like is provided between each of the exhaust ports 8 b of the plurality of cover members 8 and the suction fan 12. The flow rate adjusting means may be arranged, and the amount of air discharged from the exhaust port 8b may be adjusted for each cover member 8 by the flow rate adjustment by the flow rate adjusting means.

上述した形態では、カバー部材８ごとに、隙間Ｓを通過する空気の流量が調整されているが、カバー部材８ごとに、隙間Ｓを通過する空気の流量が調整されなくても良い。たとえば、外筒部４の長手方向における所定の領域であって、外筒部４の最大温度と最小温度との差が所定範囲内に収まる複数の領域のそれぞれに２個以上のカバー部材８が配置される場合には、それぞれの領域に配置される２個以上のカバー部材８に共通の吸引ファン１２が接続され、この共通の吸引ファン１２によって、領域ごとに、隙間Ｓを通過する空気の流量がセットで調整されても良い。すなわち、たとえば、外筒部４の温度分布が図５に示す温度分布となるロータリーキルン２の場合に、矢印Ｖ１〜Ｖ５で示す箇所を含む５個の領域のそれぞれに長さＬ２が２（ｍ）程度であるカバー部材８が２個ずつ配置されるとともに、各領域に配置される２個のカバー部材８に共通の吸引ファン１２が接続され、共通の吸引ファン１２によって、各領域に形成される２箇所の隙間Ｓを通過する空気の流量がセットで調整されても良い。 In the embodiment described above, the flow rate of air passing through the gap S is adjusted for each cover member 8, but the flow rate of air passing through the gap S may not be adjusted for each cover member 8. For example, two or more cover members 8 are provided in each of a plurality of regions that are predetermined regions in the longitudinal direction of the outer tube portion 4 and in which the difference between the maximum temperature and the minimum temperature of the outer tube portion 4 falls within a predetermined range. In the case of being arranged, a common suction fan 12 is connected to two or more cover members 8 arranged in the respective regions, and the air that passes through the gap S for each region is connected by the common suction fan 12. The flow rate may be adjusted as a set. That is, for example, in the case of the rotary kiln 2 in which the temperature distribution of the outer cylinder portion 4 is the temperature distribution shown in FIG. 5, the length L2 is 2 (m) in each of the five regions including the locations indicated by the arrows V1 to V5. Two cover members 8 each having the same degree are arranged, and a common suction fan 12 is connected to the two cover members 8 arranged in each region, and is formed in each region by the common suction fan 12. The flow rate of the air passing through the two gaps S may be adjusted as a set.

１熱回収装置
２ロータリーキルン
４外筒部
４ｃ外周面
５耐火物
８カバー部材
８ａ流入口
８ｂ排気口
９ａ温度測定用窓
１０ａ覗き窓
１２吸引ファン（空気吸引手段）
Ｌ２カバー部材の長さ
Ｓ隙間 DESCRIPTION OF SYMBOLS 1 Heat recovery apparatus 2 Rotary kiln 4 Outer cylinder part 4c Outer peripheral surface 5 Refractory material 8 Cover member 8a Inlet 8b Exhaust port 9a Temperature measuring window 10a Viewing window 12 Suction fan (air suction means)
L2 Cover member length S Clearance

Claims

In a heat recovery apparatus for recovering heat on the outer peripheral side of a rotary kiln having a cylindrical outer tube portion formed in a cylindrical shape and a refractory lined on the outer tube portion,
Comprising at least one cover member that covers the outer peripheral surface of the outer cylinder part through a predetermined gap;
The cover member is formed with an air inflow port, and an exhaust port through which air that flows in from the inflow port and passes through a gap between the outer peripheral surface of the outer cylinder part and the cover member is discharged,
The length of the cover member in the longitudinal direction of the outer cylinder portion is set so that the difference between the maximum temperature and the minimum temperature of the portion of the outer cylinder portion arranged inside the cover member is within 50 ° C. And
When only one cover member is provided, the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member is adjustable,
In the case where two or more cover members are provided, the flow rate of air passing through the gap between the outer peripheral surface of the outer tube portion and the cover member can be adjusted for each cover member ,
The cover member is composed of two cover halves that can be divided in the horizontal direction,
The cover half is movable in the horizontal direction so that an outer peripheral surface of a portion of the outer cylinder portion disposed inside the cover member is exposed, or
The two cover halves are connected by a hinge and are rotatable about the hinge so that an outer peripheral surface of a portion of the outer cylinder portion disposed inside the cover member is exposed. heat recovery apparatus characterized by there.

In a heat recovery apparatus for recovering heat on the outer peripheral side of a rotary kiln having a cylindrical outer tube portion formed in a cylindrical shape and a refractory lined on the outer tube portion,
Comprising at least one cover member that covers the outer peripheral surface of the outer cylinder part through a predetermined gap;
The cover member is formed with an air inflow port, and an exhaust port through which air that flows in from the inflow port and passes through a gap between the outer peripheral surface of the outer cylinder part and the cover member is discharged,
The length of the cover member in the longitudinal direction of the outer cylinder part is within 2.5 times the outer diameter of the outer cylinder part,
When only one cover member is provided, the flow rate of the air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member is adjustable,
In the case where two or more cover members are provided, the flow rate of air passing through the gap between the outer peripheral surface of the outer tube portion and the cover member can be adjusted for each cover member ,
The cover member is composed of two cover halves that can be divided in the horizontal direction,
The cover half is movable in the horizontal direction so that an outer peripheral surface of a portion of the outer cylinder portion disposed inside the cover member is exposed, or
The two cover halves are connected by a hinge and are rotatable about the hinge so that an outer peripheral surface of a portion of the outer cylinder portion disposed inside the cover member is exposed. heat recovery apparatus characterized by there.

The heat recovery apparatus according to claim 1, further comprising a plurality of cover members divided in a longitudinal direction of the outer cylinder portion.

A plurality of air suction means individually connected to the exhaust ports of the plurality of cover members;
By adjusting the suction flow rate of the air suction means, the flow rate of air passing through the gap between the outer peripheral surface of the outer cylinder part and the cover member is adjusted for each cover member. The heat recovery apparatus according to claim 3.

In the case where only one cover member is provided, based on the measurement result of the temperature of the portion of the outer tube portion that is disposed inside the cover member, the outer peripheral surface of the outer tube portion, the cover member, The flow rate of air passing through the gap between
In the case where two or more cover members are provided, an outer circumference of the outer cylinder portion is determined for each cover member based on a measurement result of a temperature of a portion of the outer cylinder portion arranged inside the cover member. The heat recovery apparatus according to any one of claims 1 to 4, wherein a flow rate of air passing through a gap between a surface and the cover member is adjusted.

The temperature measurement window for measuring the temperature of the part arrange | positioned inside the said cover member of the said outer cylinder part is formed in the said cover member, The any one of Claim 1 to 5 characterized by the above-mentioned. A heat recovery apparatus according to any one of the above.

The viewing member for visually confirming the outer peripheral surface of the part arrange | positioned inside the said cover member of the said outer cylinder part in the said cover member is formed of Claim 1 to 6 characterized by the above-mentioned. The heat recovery apparatus according to any one of the above.