JP2000248507A - Asphalt compound manufacturing device - Google Patents
Asphalt compound manufacturing deviceInfo
- Publication number
- JP2000248507A JP2000248507A JP11049634A JP4963499A JP2000248507A JP 2000248507 A JP2000248507 A JP 2000248507A JP 11049634 A JP11049634 A JP 11049634A JP 4963499 A JP4963499 A JP 4963499A JP 2000248507 A JP2000248507 A JP 2000248507A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- mixing chamber
- combustion
- burner
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Road Paving Machines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、道路舗装材である
アスファルト合材を製造する装置に関し、特に、新材ド
ライヤと廃材ドライヤとを併設し、各ドライヤに１基の
バーナから発生する熱風を分流させて供給するアスファ
ルト合材製造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing an asphalt mixture, which is a road pavement material, and more particularly, to an apparatus in which a new material dryer and a waste material dryer are provided in parallel, and each dryer has a hot air generated from one burner. The present invention relates to an asphalt mixture production apparatus that supplies a separated flow.
【０００２】[0002]
【従来の技術】道路工事等によって掘り起こされたアス
ファルト舗装廃材（以下「廃材」という）を加熱再生し
て新規骨材に混入してアスファルト合材として再利用す
るために、新規骨材を加熱する新材ドライヤと廃材を加
熱する廃材ドライヤが併設されることが多くなってい
る。2. Description of the Related Art Asphalt pavement waste material (hereinafter referred to as "waste material") excavated by road construction or the like is heated and regenerated, mixed with new aggregate and reused as asphalt mixture to heat the new aggregate. New material dryers and waste material dryers for heating waste materials are often installed side by side.
【０００３】そこで、本出願人は、特願平１０−３２９
３０５号に示すように、一基のバーナで新材ドライヤと
廃材ドライヤの両方に熱風を供給して効率良く加熱する
アスファルト合材製造装置を提案している。この装置は
バーナの前方に混合室を配設すると共に、混合室に圧力
センサを備え、バーナの燃焼量を調整することにより混
合室の内圧を昇降させ、新材ドライヤ及び廃材ドライヤ
への必要熱風量を維持するようにしている。Accordingly, the present applicant has filed a Japanese Patent Application No. Hei 10-329.
As shown in Japanese Patent No. 305, an asphalt mixture production apparatus has been proposed in which a single burner supplies hot air to both a new material dryer and a waste material dryer to efficiently heat them. This equipment has a mixing chamber in front of the burner and a pressure sensor in the mixing chamber.The internal pressure of the mixing chamber is raised and lowered by adjusting the combustion amount of the burner. Try to maintain the amount.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の装置ではバーナの燃焼量に対する燃焼空気量、即ち
空気比がほぼ一定で運転されることが多く、燃焼量が多
くなると燃焼空気量が多くなって排ガス量が多くなる。
そこで排ガス量が多くなると持ち去る熱量も多くなり、
省エネルギーの観点から好ましくない。また、燃焼空気
量が多くなるとサーマルＮｏｘの生成の機会も増えて環
境保全の観点からも好ましくない。However, in the above-mentioned conventional apparatus, the amount of combustion air with respect to the amount of combustion of the burner, that is, the air ratio is often almost constant, and as the amount of combustion increases, the amount of combustion air increases. The amount of exhaust gas increases.
Therefore, as the amount of exhaust gas increases, the amount of heat carried away also increases,
It is not preferable from the viewpoint of energy saving. In addition, when the amount of combustion air increases, the chance of generating thermal Nox increases, which is not preferable from the viewpoint of environmental protection.
【０００５】本発明は上記の点に鑑み、ドライヤのバー
ナ燃焼時に燃焼用空気が過剰とならないように空気比を
調整可能とするようにしたアスファルト合材製造装置を
提供することを課題とする。SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an asphalt mixture production apparatus capable of adjusting an air ratio so that combustion air does not become excessive during burner combustion of a dryer.
【０００６】[0006]
【課題を解決するための手段】本発明は上記の課題を解
決するために、燃焼室を備えたバーナの前方に所定長さ
の混合室を配設し、該混合室の下流に新材ドライヤを配
設すると共に、新材ドライヤと混合室とを連通部により
連結する一方、前記混合室に熱風導出ダクトを連結し、
該熱風導出ダクトを廃材を加熱する廃材ドライヤに連結
すると共に、廃材ドライヤの排気ダクトを前記燃焼室に
排風機を介して連結したアスファルト合材製造装置にお
いて、前記混合室に酸素濃度を検出する酸素濃度計を備
え、該酸素濃度計により検出される酸素濃度が所定の値
となるようにバーナの燃焼量及び空気比を調整制御する
ようにしたことを特徴としている。According to the present invention, in order to solve the above-mentioned problems, a mixing chamber having a predetermined length is provided in front of a burner having a combustion chamber, and a new material dryer is provided downstream of the mixing chamber. And, while connecting the new material dryer and the mixing chamber by a communication portion, connecting a hot air outlet duct to the mixing chamber,
In the asphalt mixture production apparatus in which the hot air outlet duct is connected to a waste material dryer for heating waste material and an exhaust duct of the waste material dryer is connected to the combustion chamber via an exhaust fan, the oxygen concentration in the mixing chamber is detected. A concentration meter is provided, and the burner combustion amount and the air ratio are adjusted and controlled so that the oxygen concentration detected by the oxygen concentration meter becomes a predetermined value.
【０００７】[0007]
【発明の実施の形態】本発明に係るアスファルト合材製
造装置によれば、燃焼室を備えたバーナの前方に配設し
た混合室より連通部を通してドライヤに熱風を送り込む
と共に、ドライヤに骨材を供給して骨材を加熱乾燥する
にあたって、バーナでの燃料燃焼時に混合室において酸
素濃度計により熱風中の酸素濃度を検出し、検出した酸
素濃度が所定の値を越える場合にはバーナでの燃焼量と
燃焼空気量を調整して空気比を低減させた状態で燃焼さ
せるようにする。このように、燃焼時の酸素濃度を所定
以上とならないように空気比を調整することでドライヤ
より導出される排ガス量及びサーマルＮｏｘ量の低減を
図る。According to the asphalt mixture manufacturing apparatus of the present invention, hot air is sent to a dryer through a communicating portion from a mixing chamber disposed in front of a burner having a combustion chamber, and aggregate is supplied to the dryer. When supplying and drying the aggregate by heating, the oxygen concentration in the hot air is detected by the oxygen concentration meter in the mixing chamber at the time of fuel combustion in the burner, and if the detected oxygen concentration exceeds a predetermined value, the combustion in the burner The combustion is performed with the air ratio reduced by adjusting the amount and combustion air amount. As described above, by adjusting the air ratio so that the oxygen concentration during combustion does not exceed a predetermined value, the amount of exhaust gas and the amount of thermal NOx derived from the dryer are reduced.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は本発明のアスファルト合材製造装置
を示すもので、図中の１は新規骨材を加熱乾燥するアス
ファルトプラントの新材ドライヤであって、内部に多数
の掻上げ羽根を周設した円筒状のドラム２を回転自在に
傾斜支持し、駆動装置（図示せず）により所定の速度で
回転させている。FIG. 1 shows an asphalt mixture manufacturing apparatus according to the present invention. In the figure, reference numeral 1 denotes a new material dryer of an asphalt plant for heating and drying a new aggregate, in which a number of raised blades are provided. The provided cylindrical drum 2 is rotatably inclined and supported, and is rotated at a predetermined speed by a driving device (not shown).
【００１０】３は新材ドライヤ１のホットホッパ４上流
側に設けたバーナであって、燃焼室５内で火炎を形成
し、その熱風を混合室６内を通過させてドラム２に送り
込む一方、コールドホッパ７側に設けたコンベヤ８を介
して新規骨材を投入し、新規骨材を掻上げ羽根で掻き上
げながら転動流下させる間に新規骨材を所定温度まで加
熱して排出部９より排出する。Reference numeral 3 denotes a burner provided on the upstream side of the hot hopper 4 of the new material dryer 1, which forms a flame in the combustion chamber 5 and sends the hot air to the drum 2 while passing through the mixing chamber 6; The new aggregate is charged through a conveyor 8 provided on the cold hopper 7 side, and the new aggregate is heated to a predetermined temperature while being rolled down while the new aggregate is being scraped up by the scraper blades. Discharge.
【００１１】混合室６とドラム２との間には熱風を通過
させる連通部１０を配設し、該連通部１０には流路の断
面積を所定量減少させて通過する熱風に所定の圧力損失
を生じさせて混合室６に背圧を与える背圧発生部１１を
備えており、該背圧発生部１１によって混合室６内の圧
力をバーナ３の風量及び燃焼量の調整によって２０ｍｍ
Ａｑ〜１００ｍｍＡｑ程度に調整可能としている。A communication portion 10 for passing hot air is provided between the mixing chamber 6 and the drum 2. The communication portion 10 reduces the cross-sectional area of the flow path by a predetermined amount and applies a predetermined pressure to the hot air passing therethrough. A back pressure generating unit 11 is provided for causing a back pressure to the mixing chamber 6 by causing a loss, and the back pressure generating unit 11 controls the pressure in the mixing chamber 6 to 20 mm by adjusting the air volume and the combustion volume of the burner 3.
It can be adjusted to about Aq to 100 mmAq.
【００１２】そして、混合室６には混合室６内の圧力を
検出する圧力センサ１２を配設すると共に酸素濃度を検
出する酸素濃度計１３を配設する一方、新材ドライヤ１
の排出部９には新材の骨材温度を検出する温度センサ１
４を配設している。The mixing chamber 6 is provided with a pressure sensor 12 for detecting the pressure in the mixing chamber 6 and an oximeter 13 for detecting the oxygen concentration.
Temperature sensor 1 that detects the aggregate temperature of new wood
4 are arranged.
【００１３】更に混合室６にはバーナ３の風量及び燃焼
量を制御するバーナ燃焼制御装置１５を配設しており、
バーナ燃焼制御装置１５は、バーナ３の燃焼量を制御す
る制御部１６と、各種データを設定入力する入力部１７
と、入力した各種データを記憶する記憶部１８と、圧力
センサ１２や酸素濃度計１３及び温度センサ１４の信号
を受け入れたり制御部１６からの制御信号を出力する入
出力部１９とを備えている。Further, the mixing chamber 6 is provided with a burner combustion control device 15 for controlling the air volume and the combustion volume of the burner 3.
The burner combustion control device 15 includes a control unit 16 for controlling the combustion amount of the burner 3 and an input unit 17 for setting and inputting various data.
And a storage unit 18 for storing various input data, and an input / output unit 19 for receiving signals from the pressure sensor 12, the oximeter 13 and the temperature sensor 14, and outputting a control signal from the control unit 16. .
【００１４】そして、バーナ燃焼制御装置１５には、運
転時に検出した骨材温度と予め設定した骨材温度とを比
較し、骨材温度が設定骨材温度より越えているか、下回
っているかを判断し、その温度差値量と骨材供給量から
増減させる必要熱量を算出し、また、その必要熱量を増
減させるためには混合室の圧力をどの程度上昇または下
降させれば良いかを決定するデータ等を記憶している。The burner combustion control device 15 compares the aggregate temperature detected during operation with the preset aggregate temperature to determine whether the aggregate temperature is higher or lower than the set aggregate temperature. Then, the required heat amount to be increased or decreased from the temperature difference value amount and the aggregate supply amount is calculated, and how much the pressure of the mixing chamber should be increased or decreased to increase or decrease the required heat amount is determined. Data and the like are stored.
【００１５】また、運転時に検出した酸素濃度と予め設
定した設定酸素濃度とを比較し、検出した酸素濃度が設
定酸素濃度をこえている場合に、その過剰な酸素濃度に
応じてどのような空気比によって燃焼を行えば良いかを
決定するデータ等をも記憶させている。また、圧力セン
サ１２や酸素濃度計１３による検出圧力及び酸素濃度が
適正な値になるようにバーナの風量及び燃焼量を増減さ
せて骨材温度をコントロールするプログラムを内蔵して
いる。[0015] Further, the oxygen concentration detected during operation is compared with a preset oxygen concentration, and if the detected oxygen concentration exceeds the preset oxygen concentration, what kind of air depends on the excess oxygen concentration is determined. Data for determining whether to perform combustion based on the ratio is also stored. Further, a program for controlling the aggregate temperature by increasing or decreasing the air volume and the combustion volume of the burner so that the pressure detected by the pressure sensor 12 and the oxygen concentration meter 13 and the oxygen concentration become appropriate values is incorporated.
【００１６】新材ドライヤ１のコールドホッパ７には排
ガスを導出させる排気煙道２０を連結し、その下流には
排ガスを吸引する排風機２１と排ガス中のダストを除去
するバグフィルター２２及び排ガスを大気中に放出する
煙突２３を配設しており、更に、排気煙道２０の途中を
分岐してリターン煙道２４を連結し、風量調整ダンパー
２５を介してその端部を燃焼室５の上流側に連結してい
る。なお、風量調整ダンパー２５の開閉制御は、混合室
６の室内温度に基づいて行っており、室内温度が上昇し
すぎると内壁の材料によっては焼損に至ることがあるた
めにダンパー開度を調整して室内温度を低下調整できる
ようにしている。An exhaust flue 20 for discharging exhaust gas is connected to the cold hopper 7 of the new material dryer 1, and an exhaust fan 21 for sucking the exhaust gas, a bag filter 22 for removing dust in the exhaust gas, and the exhaust gas A chimney 23 for discharging into the atmosphere is provided, and a return flue 24 is connected by branching off the middle of the exhaust flue 20, and the end of the chimney 23 is upstream of the combustion chamber 5 via a flow rate adjusting damper 25. Connected to the side. The opening / closing control of the air volume adjustment damper 25 is performed based on the room temperature of the mixing chamber 6, and if the room temperature rises too much, depending on the material of the inner wall, burnout may occur. So that the room temperature can be adjusted to lower.
【００１７】２６は廃材を加熱再生する廃材ドライヤで
あって、新材ドライヤ１とほぼ同様の構造をしており、
回転自在に傾斜支持した円筒状のドラム２７内に掻上げ
羽根を周設し、一端部にホットホッパ２８を、他端部に
コールドホッパ２９を配設している。そしてコンベヤ３
０により廃材をホットホッパ２８側から供給し、掻上げ
羽根で掻き上げながらドラム２７内を転動流下させる間
に廃材を所定温度まで加熱し、排出部３１より排出す
る。Reference numeral 26 denotes a waste material dryer for heating and regenerating the waste material, and has a structure substantially similar to that of the new material dryer 1.
A scraping blade is provided around a cylindrical drum 27 rotatably supported in an inclined manner, and a hot hopper 28 is provided at one end and a cold hopper 29 is provided at the other end. And conveyor 3
At 0, the waste material is supplied from the hot hopper 28 side, is heated to a predetermined temperature while rolling down the inside of the drum 27 while being scraped up by the scraping blades, and is discharged from the discharge unit 31.
【００１８】バーナ３により発生する熱風を廃材ドライ
ヤ２６に導くために、燃焼室５の下流側の混合室６と廃
材ドライヤ２５のホットホッパ２８とを熱風導出ダクト
３２により連結している。また、廃材ドライヤ２６のコ
ールドホッパ２９には排気ダクト３３を連結し、該排気
ダクト３３の途中にサイクロン集塵機３４及び排風機３
５を配設している。また、排風機３５の上流側の排気ダ
クト３３には風量調整用ダンパー３６を配設しており、
該風量調整用ダンパー３６は排風機３５によって廃材ド
ライヤ２６に導入する熱風量を調整するもので、その開
閉制御は、廃材ドライヤ２６から排出される加熱廃材温
度や排ガス温度に基づいて行うようにしている。In order to guide the hot air generated by the burner 3 to the waste material dryer 26, the mixing chamber 6 on the downstream side of the combustion chamber 5 and the hot hopper 28 of the waste material dryer 25 are connected by a hot air outlet duct 32. An exhaust duct 33 is connected to the cold hopper 29 of the waste material dryer 26, and a cyclone dust collector 34 and an exhaust
5 are arranged. Further, a damper 36 for adjusting the air volume is arranged in the exhaust duct 33 on the upstream side of the exhaust fan 35,
The air volume adjusting damper 36 adjusts the amount of hot air introduced into the waste material dryer 26 by the air blower 35, and its opening and closing control is performed based on the temperature of the heated waste material and the exhaust gas temperature discharged from the waste material dryer 26. I have.
【００１９】また、排風機３５の下流側の排気ダクト３
３には背圧調整用ダンパー３７を配設しており、該背圧
調整用ダンパー３７は前記風量調整用ダンパー３６の上
流側と下流側との差圧が所定の差圧になるように風量調
整用ダンパー３６の下流側の背圧を調整するもので、風
量調整用ダンパー３６の前後に渡って配設した差圧セン
サ３８により検出する差圧が予め設定した差圧になるよ
うに排気ダクト背圧制御装置３９によりその開度を調整
するようにしている。The exhaust duct 3 on the downstream side of the exhaust fan 35
3 is provided with a back pressure adjusting damper 37. The back pressure adjusting damper 37 has an air flow rate such that the differential pressure between the upstream side and the downstream side of the air volume adjusting damper 36 becomes a predetermined differential pressure. The exhaust duct adjusts the back pressure on the downstream side of the adjustment damper 36, so that the differential pressure detected by the differential pressure sensor 38 disposed before and after the air volume adjustment damper 36 becomes a preset differential pressure. The opening is adjusted by the back pressure control device 39.
【００２０】これは、前記風量調整用ダンパー３６の上
流側と下流側との差圧が安定しないと風量調整用ダンパ
ー３６の開度と風量の関係が相関関係に維持されず、風
量調整用ダンパー３６の開度調整にもかかわらず期待通
りの風量調整ができないためである。If the pressure difference between the upstream side and the downstream side of the air volume adjusting damper 36 is not stable, the relationship between the opening degree of the air volume adjusting damper 36 and the air volume will not be maintained in a correlation, and the air volume adjusting damper will not be maintained. This is because the air volume cannot be adjusted as expected despite the opening degree adjustment of 36.
【００２１】また、排気ダクト３３には必要に応じて排
風機３５の下流を分岐させて循環ダクト４０を連結し、
該循環ダクト４０の途中に風量調整用ダンパー４１を配
設すると共に、その他端部を熱風導出ダクト３２に連結
し、廃材ドライヤ２６から排出される温度の低下した排
ガスの一部を循環させて熱風導出ダクト３２内の高温熱
風と合流させている。風量調整用ダンパー４１の開閉制
御は、廃材ドライヤ２６の入り口の熱風温度に基づいて
行い、廃材ドライヤ２６に導入する熱風を廃材の加熱に
適した温度に適宜調整できるようにしている。なお、廃
材ドライヤ２６に導入する熱風温度の調整は外気を吸引
して行っても良い。Further, a circulation duct 40 is connected to the exhaust duct 33 by branching the downstream of the blower 35 as necessary.
An air flow adjusting damper 41 is provided in the middle of the circulation duct 40, and the other end is connected to a hot air outlet duct 32 to circulate a part of the exhaust gas at a reduced temperature discharged from the waste material dryer 26 to generate hot air. It joins with the high temperature hot air in the outlet duct 32. The opening / closing control of the air volume adjustment damper 41 is performed based on the hot air temperature at the entrance of the waste material dryer 26, so that the hot air introduced into the waste material dryer 26 can be appropriately adjusted to a temperature suitable for heating the waste material. The temperature of the hot air introduced into the waste material dryer 26 may be adjusted by sucking outside air.
【００２２】４２は排気煙道２０の排風機２１下流に配
設した風量調整用ダンパーであって、新材ドライヤ１の
ホットホッパ４内隅部の静圧を検出してこの静圧をほぼ
大気圧程度に維持するように開閉制御され、ホットホッ
パ４の隙間から余分な外気をを吸引しないようにしてい
る。また、４３は熱風導出ダクト３２に配設した風量調
整用ダンパーであって、前記と同様に廃材ドライヤ２６
のホットホッパ２８内隅部の静圧に基づいて開閉制御さ
れる。Reference numeral 42 denotes an air volume adjusting damper disposed downstream of the exhaust fan 21 of the exhaust flue 20, and detects a static pressure in the inner corner of the hot hopper 4 of the new material dryer 1 to increase the static pressure substantially. Opening / closing is controlled so as to be maintained at about the atmospheric pressure, so that excess outside air is not sucked through the gap of the hot hopper 4. Reference numeral 43 denotes a damper for adjusting the air volume provided in the hot air outlet duct 32.
Is controlled based on the static pressure at the inner corner of the hot hopper 28.
【００２３】しかして、上記アスファルト合材製造装置
を運転して新規骨材と廃材とを加熱する場合には、先
ず、バーナ燃焼制御装置１５に新規骨材温度の加熱目標
温度である設定骨材温度を設定する。そしてバーナ３を
燃焼させて燃焼室５内に火炎を形成すると共に、下流の
排風機２１により熱風を吸引して混合室６及びドラム２
内を通過する高温ガス流を維持しながらコンベヤ８によ
って新規骨材をドラム２内に供給する。When the asphalt mixture manufacturing apparatus is operated to heat the new aggregate and the waste material, first, the burner combustion control device 15 first sets the set aggregate which is the heating target temperature of the new aggregate temperature. Set the temperature. Then, the burner 3 is burned to form a flame in the combustion chamber 5, and hot air is sucked by a downstream exhaust 21 to mix the mixing chamber 6 and the drum 2.
New aggregate is fed into the drum 2 by the conveyor 8 while maintaining a hot gas flow passing through it.
【００２４】このとき、混合室６と新材ドライヤ１とを
連結する連通部１０を熱風が通過すると、連通部１０の
一部の断面積を狭くした背圧発生部１１で圧力損失が生
じて混合室６に背圧を生じさせるが、混合室６内の圧力
は低くても２０ｍｍＡｑ程度に維持して新材ドライヤ１
と廃材ドライヤ２６の両方に熱風を分配供給できるよう
にし、またバーナ３の風量及び燃焼量を増加させれば圧
力を１００ｍｍＡｑ程度まで高めれるようにしている。At this time, when hot air passes through the communicating portion 10 connecting the mixing chamber 6 and the new material dryer 1, a pressure loss occurs in the back pressure generating portion 11 in which the sectional area of a part of the communicating portion 10 is reduced. A back pressure is generated in the mixing chamber 6, but the pressure in the mixing chamber 6 is maintained at about 20 mmAq at least, and the new material dryer 1 is maintained.
The hot air can be distributed and supplied to both the waste material dryer 26 and the waste material dryer 26, and the pressure can be increased to about 100 mmAq by increasing the air volume and the combustion volume of the burner 3.
【００２５】新材ドライヤ１内に送り込まれた骨材がド
ラム２から排出され始め、加熱骨材の温度が検出され始
めると、骨材温度を所定周期で読み取り、予め設定した
設定骨材温度と比較する。読み取った骨材温度が骨材温
度設定値より低い場合には、その温度差や骨材供給量か
ら補給する必要熱量を求め、その必要熱量を補給するた
めに混合室６の圧力をどの程度上昇させるかを決定し、
混合室６の圧力がその値になるようにバーナ３の風量及
び燃焼量を増加させることによって新材ドライヤ１内に
送り込む熱風量を多くして骨材温度を高める。また、骨
材温度が設定値よりも高い場合には、減少させる熱量を
求め、この熱量分を減少させるには混合室６の圧力をど
の程度下降させるかを決定し、混合室６の圧力がその値
になるようにバーナ３の風量及び燃焼量を減少させて新
材ドライヤ１内に送り込む熱風量を少なくして骨材温度
を低下させる。When the aggregate sent into the new material dryer 1 starts to be discharged from the drum 2 and the temperature of the heated aggregate starts to be detected, the aggregate temperature is read at a predetermined cycle, and the preset aggregate temperature and the preset aggregate temperature are compared. Compare. If the read aggregate temperature is lower than the aggregate temperature set value, the required amount of heat to be replenished is determined from the temperature difference and the amount of aggregate supplied, and how much the pressure of the mixing chamber 6 is increased to replenish the required amount of heat. Decide what to do,
By increasing the air volume and the combustion volume of the burner 3 so that the pressure of the mixing chamber 6 becomes the same value, the amount of hot air sent into the new material dryer 1 is increased to increase the aggregate temperature. If the aggregate temperature is higher than the set value, the amount of heat to be reduced is determined, and to reduce the amount of heat, how much the pressure of the mixing chamber 6 is reduced is determined. The amount of air and the amount of combustion of the burner 3 are reduced so as to have the values, and the amount of hot air sent into the new material dryer 1 is reduced to lower the aggregate temperature.
【００２６】また、混合室６内の酸素濃度を酸素濃度計
１３によって所定周期で読み取り、予め設定した設定酸
素濃度と比較する。設定酸素濃度は約５％以内程度とす
ると良い。読み取った酸素濃度が設定酸素濃度より高い
場合には、先ず、燃焼量に対する燃焼空気量の比、即
ち、空気比をどの程度減少させれば良いかを決定すると
共に、決定した空気比において必要な熱量を得るにはは
どの程度の燃焼量が必要かを決定し、バーナ３の風量及
び燃焼量を調整することによって混合室６内の酸素濃度
を所望濃度以下に維持する。The oxygen concentration in the mixing chamber 6 is read at a predetermined cycle by the oxygen concentration meter 13 and compared with a preset oxygen concentration. The set oxygen concentration is preferably about 5% or less. If the read oxygen concentration is higher than the set oxygen concentration, first, the ratio of the combustion air amount to the combustion amount, that is, how much the air ratio should be reduced is determined, and the necessary air ratio is determined for the determined air ratio. The amount of combustion required to obtain the heat is determined, and the air concentration and the combustion amount of the burner 3 are adjusted to maintain the oxygen concentration in the mixing chamber 6 at or below the desired concentration.
【００２７】一方、廃材ドライヤ２５側では、下流の排
風機３５を駆動して混合室６内の熱風を熱風導出ダクト
３２を通してドラム２７内へと導くと共に、コンベヤ３
０にて廃材をドラム２７内に供給する。廃材ドライヤ２
６へ導く熱風量の調整は、ドラム２７から排出される廃
材の温度に応じて排気ダクト３３に配設された風量調整
用ダンパー３６の開度を調整することによって行う。On the other hand, on the waste material dryer 25 side, the downstream air blower 35 is driven to guide the hot air in the mixing chamber 6 through the hot air outlet duct 32 into the drum 27 and the conveyor 3.
At 0, the waste material is supplied into the drum 27. Waste material dryer 2
The adjustment of the amount of hot air guided to 6 is performed by adjusting the opening of the air volume adjusting damper 36 provided in the exhaust duct 33 according to the temperature of the waste material discharged from the drum 27.
【００２８】このとき、新材ドライヤ１側の骨材温度を
制御するためにバーナ３の風量及び燃焼量を増減するこ
とによって混合室６内の圧力が変動すると、廃材ドライ
ヤ２６に吸引される熱風の静圧が変動し、吸引される熱
風量に変化をもたらすようになるが、排気ダクト背圧制
御装置３９では差圧センサ３８によって検出される風量
調整用ダンパー３６の上流側と下流側との差圧を逐次取
り込み、この差圧が予め設定している値からはずれる
と、排風機３５の下流に配設した背圧調整ダンパー３７
の開度を調整し、風量調整用ダンパー３６の上流側と下
流側との差圧を予め設定している値になるように制御す
る。これによって風量調整用ダンパー３６の開度の変化
量と熱風量の変化量とを相関関係に維持でき、安定した
熱風量の調整が可能となって廃材温度を正確にコントロ
ールできる。At this time, if the pressure in the mixing chamber 6 fluctuates by increasing or decreasing the air volume and the combustion volume of the burner 3 in order to control the aggregate temperature on the new material dryer 1 side, the hot air sucked into the waste material dryer 26 The static pressure of the air flow fluctuates, causing a change in the amount of hot air to be sucked. However, the exhaust duct back pressure control device 39 detects a difference between the upstream side and the downstream side of the air volume adjusting damper 36 detected by the differential pressure sensor 38. When the differential pressure deviates from a preset value, a back pressure adjusting damper 37 disposed downstream of the exhaust fan 35 is taken in.
Is controlled so that the differential pressure between the upstream side and the downstream side of the air volume adjusting damper 36 becomes a preset value. As a result, the amount of change in the degree of opening of the air volume adjusting damper 36 and the amount of change in the amount of hot air can be maintained in a correlation, and the amount of hot air can be adjusted stably, and the temperature of the waste material can be accurately controlled.
【００２９】そして廃材ドライヤ２６を通過した排ガス
はサイクロン集塵機３４によりダストを除去された後、
その多くは燃焼室５側に流れ、燃焼室５にて約１２００
℃程度の火炎に晒されながら混合室６内を通過する間に
バーナ３の高温熱風と混合されて再加熱される。このと
き、排ガス中の悪臭分も燃焼されて除去される。The exhaust gas having passed through the waste material dryer 26 is subjected to dust removal by a cyclone dust collector 34.
Most of it flows to the combustion chamber 5 side, and in the combustion chamber 5, about 1200
While passing through the mixing chamber 6 while being exposed to a flame of about ° C., it is mixed with the high-temperature hot air of the burner 3 and reheated. At this time, the offensive odor in the exhaust gas is also burned and removed.
【００３０】このように、新材ドライヤ１から排出され
る加熱骨材温度に応じて混合室６内の圧力を適宜変化さ
せるようにバーナ３の燃焼制御を行うことによって新材
ドライヤ１への熱風量調整を行うのみならず、混合室６
内の酸素濃度を所定濃度以下に維持するようにすること
で、燃焼空気量ができるだけ少なくなるようにして排ガ
ス量が多くなるのを抑制するようにしている。このこと
により排ガス量が持ち去る熱量が減少して省エネルギー
の観点から好ましいものとなり、また、燃焼空気量の低
減からサーマルＮｏｘの生成の機会も減少して環境保全
の観点からも好ましいものとなる。As described above, by controlling the combustion of the burner 3 so as to appropriately change the pressure in the mixing chamber 6 in accordance with the temperature of the heated aggregate discharged from the new material dryer 1, hot air to the new material dryer 1 is obtained. In addition to adjusting the volume, the mixing chamber 6
By maintaining the oxygen concentration in the inside at a predetermined concentration or less, the amount of combustion air is reduced as much as possible, and the increase in the amount of exhaust gas is suppressed. As a result, the amount of exhaust gas is reduced and the amount of heat carried away is reduced, which is preferable from the viewpoint of energy saving. In addition, since the amount of combustion air is reduced, the opportunity for generation of thermal Nox is reduced, which is preferable from the viewpoint of environmental conservation.
【００３１】[0031]
【発明の効果】以上のように本発明に係るアスファルト
合材製造装置によれば、燃焼室を備えたバーナの前方に
所定長さの混合室を配設し、該混合室の下流に新材ドラ
イヤを配設すると共に、新材ドライヤと混合室とを連通
部により連結する一方、前記混合室に熱風導出ダクトを
連結し、該熱風導出ダクトを廃材を加熱する廃材ドライ
ヤに連結すると共に、廃材ドライヤの排気ダクトを前記
燃焼室に排風機を介して連結したアスファルト合材製造
装置において、前記混合室に酸素濃度を検出する酸素濃
度計を備え、該酸素濃度計により検出される酸素濃度が
所定の値となるようにバーナの燃焼量及び空気比を調整
制御するようにしたので、検出した酸素濃度が所定の値
を越える場合にはバーナでの燃焼量と燃焼空気量を調整
して空気比を低減させた状態で燃焼させることができて
燃焼空気量を適正化することができ、ドライヤより導出
する排ガス量及びサーマルＮｏｘ量の低減を図ることが
できて省エネルギー及び環境保全について好ましいもの
となる。As described above, according to the asphalt mixture manufacturing apparatus of the present invention, a mixing chamber having a predetermined length is provided in front of a burner having a combustion chamber, and a new material is provided downstream of the mixing chamber. A dryer is provided, and the new material dryer and the mixing chamber are connected by a communicating portion, while a hot air outlet duct is connected to the mixing chamber, and the hot air outlet duct is connected to a waste material dryer that heats the waste material. In an asphalt mixture production apparatus in which an exhaust duct of a dryer is connected to the combustion chamber via an exhaust fan, an oxygen concentration meter for detecting an oxygen concentration is provided in the mixing chamber, and the oxygen concentration detected by the oxygen concentration meter is a predetermined value. When the detected oxygen concentration exceeds a predetermined value, the burner combustion amount and the combustion air amount are adjusted and the air ratio is adjusted. Reduce And it can be burned in a state in which it is possible to optimize the quantity of combustion air, which is preferable for energy conservation and environmental protection to be able to reduce the quantity of exhaust gas and thermal Nox quantity derived from the dryer.
【図１】本発明に係るアスファルト合材製造装置の一実
施例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing one embodiment of an asphalt mixture production apparatus according to the present invention.
１…新材ドライヤ ３…バーナ ５…燃焼室 ６…混合室 １０…連通部 １１…背圧発生
管 １２…圧力センサ １３…酸素濃度
計 １４…温度センサ １５…バーナ燃
焼制御装置 ２０…排気煙道 ２１…排風機 ２４…リターン煙道 ２６…廃材ドラ
イヤ ３２…熱風導出ダクト ３３…排気ダク
ト ３５…排風機 ３６…風量調整
用ダンパー ３７…背圧調整用ダンパーDESCRIPTION OF SYMBOLS 1 ... New material dryer 3 ... Burner 5 ... Combustion chamber 6 ... Mixing chamber 10 ... Communication part 11 ... Back pressure generation pipe 12 ... Pressure sensor 13 ... Oxygen concentration meter 14 ... Temperature sensor 15 ... Burner combustion control device 20 ... Exhaust flue 21 ... exhaust fan 24 ... return flue 26 ... waste material dryer 32 ... hot air outlet duct 33 ... exhaust duct 35 ... exhaust fan 36 ... air volume adjustment damper 37 ... back pressure adjustment damper
Claims (1)
混合室を配設し、該混合室の下流に新材ドライヤを配設
すると共に、新材ドライヤと混合室とを連通部により連
結する一方、前記混合室に熱風導出ダクトを連結し、該
熱風導出ダクトを廃材を加熱する廃材ドライヤに連結す
ると共に、廃材ドライヤの排気ダクトを前記燃焼室に排
風機を介して連結したアスファルト合材製造装置におい
て、前記混合室に酸素濃度を検出する酸素濃度計を備
え、該酸素濃度計により検出される酸素濃度が所定の値
となるようにバーナの燃焼量及び空気比を調整制御する
ようにしたことを特徴とするアスファルト合材製造装
置。A mixing chamber having a predetermined length is provided in front of a burner provided with a combustion chamber, a new material dryer is provided downstream of the mixing chamber, and a communication section is provided between the new material dryer and the mixing chamber. And a hot air outlet duct connected to the mixing chamber, the hot air outlet duct connected to a waste material dryer for heating waste material, and an exhaust duct of the waste material dryer connected to the combustion chamber via a blower. In the composite material manufacturing apparatus, the mixing chamber is provided with an oxygen concentration meter for detecting the oxygen concentration, and the burner combustion amount and the air ratio are adjusted and controlled so that the oxygen concentration detected by the oxygen concentration meter becomes a predetermined value. An asphalt mixture manufacturing apparatus, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11049634A JP2000248507A (en) | 1999-02-26 | 1999-02-26 | Asphalt compound manufacturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11049634A JP2000248507A (en) | 1999-02-26 | 1999-02-26 | Asphalt compound manufacturing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000248507A true JP2000248507A (en) | 2000-09-12 |
Family
ID=12836660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11049634A Pending JP2000248507A (en) | 1999-02-26 | 1999-02-26 | Asphalt compound manufacturing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000248507A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004014782A1 (en) * | 2004-03-23 | 2005-10-13 | Ammann Asphalt Gmbh | Asphalt system for drying, heating and mixing mineral material with liquid bitumen comprises a control circuit with a pressure sensor and a drum suction flap, and a control circuit with a pressure sensor and a mixing tower suction flap |
| JP2013508577A (en) * | 2009-10-23 | 2013-03-07 | ロエシェ ゲーエムベーハー | Method and system for producing an asphalt mixture |
| JP2013104257A (en) * | 2011-11-16 | 2013-05-30 | Nikko Co Ltd | Asphalt mixture manufacturing device |
| EP3533929A1 (en) * | 2018-03-02 | 2019-09-04 | Benninghoven GmbH & Co. KG | Method for generating a controlled underpressure in at least one dryer drum of a system for asphalt manufacturing and said system for asphalt manufacturing |
-
1999
- 1999-02-26 JP JP11049634A patent/JP2000248507A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004014782A1 (en) * | 2004-03-23 | 2005-10-13 | Ammann Asphalt Gmbh | Asphalt system for drying, heating and mixing mineral material with liquid bitumen comprises a control circuit with a pressure sensor and a drum suction flap, and a control circuit with a pressure sensor and a mixing tower suction flap |
| DE102004014782B4 (en) * | 2004-03-23 | 2008-11-06 | Ammann Asphalt Gmbh | Asphalt plant and method for dedusting an asphalt plant |
| JP2013508577A (en) * | 2009-10-23 | 2013-03-07 | ロエシェ ゲーエムベーハー | Method and system for producing an asphalt mixture |
| JP2013104257A (en) * | 2011-11-16 | 2013-05-30 | Nikko Co Ltd | Asphalt mixture manufacturing device |
| EP3533929A1 (en) * | 2018-03-02 | 2019-09-04 | Benninghoven GmbH & Co. KG | Method for generating a controlled underpressure in at least one dryer drum of a system for asphalt manufacturing and said system for asphalt manufacturing |
| EP3533930A1 (en) * | 2018-03-02 | 2019-09-04 | Benninghoven GmbH & Co. KG | Method for generating a controlled underpressure in at least one dryer drum of a system for asphalt manufacturing and said system for asphalt manufacturing |
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