JP3958942B2 - Exhaust gas circulation system for regenerative burner - Google Patents

Exhaust gas circulation system for regenerative burner Download PDF

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Publication number
JP3958942B2
JP3958942B2 JP2001191496A JP2001191496A JP3958942B2 JP 3958942 B2 JP3958942 B2 JP 3958942B2 JP 2001191496 A JP2001191496 A JP 2001191496A JP 2001191496 A JP2001191496 A JP 2001191496A JP 3958942 B2 JP3958942 B2 JP 3958942B2
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exhaust gas
regenerative burner
pipe
gas circulation
branch pipes
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JP2003004226A (en
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剛 田中
知至 庄野
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Nippon Steel Corp
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Nippon Steel Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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Description

【０００１】
【発明の属する技術分野】
本発明はリジェネレイティブバーナ用排気ガス循環装置に関する。さらに詳しくは、循環する排気ガスの流量制御を長期的に安定して行なうことができ、しかも流量制御機構の設備費用が安価であるリジェネレイティブバーナ用排気ガス循環装置に関する。
【０００２】
【従来の技術】
連続焼鈍炉、熱処理炉などの比較的高温の加熱帯において、炉内加熱用のヒータとして、近年では省エネルギーの観点から、熱交換器を内蔵するラジアントチューブバーナが用いられている。たとえば、蓄熱型熱交換器を内蔵するリジェネレイティブラジアントチューブバーナ（以下、リジェネバーナという）は、蓄熱体を有する一対のバーナを備え、バーナを交互に燃焼させることにより、一方のバーナの燃焼によって生じる排気ガスの熱を他方のバーナの蓄熱体によって回収するものである。
【０００３】
一般的なリジェネバーナは、図３に示されるように、ラジアントチューブ４１と、該ラジアントチューブ４１の両端に設けられた、蓄熱体４３を有する一対のバーナ４２と、該一対のバーナ４２にそれぞれ接続された２対の燃焼空気切替弁４４および排気ガス切替弁４５とから構成されている。
【０００４】
燃焼空気ブロア５５から流量調整弁５６を介して燃焼空気を供給するとともに、２対の燃焼空気切替弁４４および排気ガス切替弁４５を所定の時間間隔（２０〜３０秒程度）ごとに切り替えることにより、一方の燃焼を行なうバーナに大気および燃料ガスを導入させ、他方の燃焼していないバーナを通して排気および蓄熱を行なうことができる。
【０００５】
このようなリジェネバーナは、燃焼用空気の温度を７００℃以上程度まで昇温するため、チッ素酸化物（以下、ＮＯｘという）の生成が著しい。そこで、ＮＯｘの生成を低減するためには、一般に排気ガスの一部を燃焼空気または燃焼ガスに混合する方法により、火炎温度や反応速度を低下させる方法が用いられている。
【０００６】
排気ガスの一部を燃焼空気または燃焼ガスに混合する方法としては、バーナの本体部分でガスまたは空気を通気させる際の吐出流れを利用する自己循環方式、および外部に排気ガス循環ブロアなどの送風手段を備えた強制循環方式がある。
【０００７】
たとえば、特開昭５２−１４２５５号、特開昭５６−２５６１７号、特開平８−６１６５７号公報などに記載された強制循環方式の排気ガス循環装置では、図３に示されるように、排気ガス切替弁４５を通過する排気ガスの大部分は煙突４６から炉外へ排気されるが、排気ガスの一部は、煙突４６から排気ガス循環ブロア４７により循環経路５４へ送られる。流量調節器４８では、温度センサ５０、ガス流量測定器５１、排気ガス流量測定器５２および燃焼空気量測定器５３などを用いて得られた炉温、燃焼負荷、燃焼空気量、燃焼ガス量または排気ガス循環率などのパラメータによって排ガス循環量を決定し、排気ガス調整弁４９で所定の流量を得るように制御している。
【０００８】
【発明が解決しようとする課題】
しかし、自己循環方式を利用する場合は、ガスまたは空気を高圧化する供給設備が高額となる。また、強制循環方式では、排気ガス循環量の調節のため、高価な流量調節弁が必要となり、また排気ガス中に含まれる煤やスケールが前記流量調節弁４９の弁体やシャフトに噛み込み、前記流量調節弁４９はたびたび動作不良が発生し、長期に排気ガスの流量制御を行なうことが困難であった。
【０００９】
本発明はかかる問題を解消するためになされたものであり、循環する排気ガスの流量制御を長期的に安定して行なうことができ、しかも流量制御機構の設備費用が安価であるリジェネレイティブバーナ用排気ガス循環装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明のリジェネレイティブバーナ用排気ガス循環装置は、リジェネレイティブバーナから排気される排気ガスを当該リジェネレイティブバーナの燃焼空気または燃焼ガス供給用配管へ循環させる循環経路を備えた、リジェネレイティブバーナから排出されるチッ素酸化物を低減するためのリジェネレイティブバーナ用排気ガス循環装置であって、
（ａ）前記循環経路に設けられた送風手段と、
（ｂ）前記循環経路に設けられた、並列に並ぶ複数の分岐管からなる並列配管と、
（ｃ）当該並列配管の分岐管のうち、少なくとも分岐管の数から１を減じた数の分岐管に設けられた、前記分岐管における排気ガスの流通を選択的に遮断する遮断手段とからなることを特徴とする。
【００１１】
前記並列配管の分岐管のそれぞれが、異なる圧力損失特性を有してなるのが好ましい。
【００１２】
前記並列配管の分岐管のそれぞれが、異なる配管径を有することにより、異なる圧力損失特性を有してなるのが好ましい。
【００１３】
前記並列配管の分岐管のそれぞれが、当該分岐管の圧力特性の設定を変更するための手動弁を有してなるのが好ましい。
【００１４】
前記遮断手段が、電気または圧縮空気により操作される遮断弁からなるのが好ましい。
【００１５】
前記循環経路全体の排気ガスの流通を選択的に遮断する遮断手段をさらに備えてなるのが好ましい。
【００１６】
【発明の実施の形態】
つぎに図面を参照しながら、本発明のリジェネバーナ用排気ガス循環装置をさらに詳細に説明する。図１は本発明のリジェネバーナ用排気ガス循環装置の一実施の形態を示す排気ガス循環装置を備えたリジェネバーナの全体構成を概略的に示す説明図、図２は図１の循環経路を流れる排気ガスの流量を示すグラフである。
【００１７】
図１に示される本実施の形態にかかわる排気ガス循環装置を備えたリジェネバーナは、循環経路７の排気ガスの流量制御を行なうための手段として、前述の多段階の流量調節を行なう排気ガス流量調整弁４９（図３参照）の代わりに並列配管１１および当該並列配管１１の分岐管１２、１３の少なくとも１つを選択的に遮断する遮断弁１４を採用した点に大きな特徴があり、その他の構成については図３に示されるリジェネバーナシステムとほぼ共通している。以下、図１のリジェネバーナシステムについてさらに具体的に説明する。
【００１８】
図１に示されるリジェネバーナは、ラジアントチューブ１と、該ラジアントチューブ１の両端に設けられた、蓄熱体３を有する一対のバーナ２と、該一対のバーナ２にそれぞれ接続された２対の燃焼空気切替弁４および排気ガス切替弁５とから構成されている。燃焼空気ブロア８から流量調整弁９を介して燃焼空気を供給するとともに、２対の燃焼空気切替弁４および排気ガス切替弁５を所定の時間間隔（２０〜３０秒程度）ごとに切り替えることにより、一方の燃焼を行なうバーナに大気および燃料ガスを導入させ、他方の燃焼していないバーナを通して排気および蓄熱を行なうことができる。
【００１９】
さらに、図１に示されるように、排気ガス切替弁５を通過する排気ガスの大部分は煙突６から炉外へ排気されるが、排気ガスの一部は、循環経路７へ送られる。
【００２０】
図１に示される排気ガス循環装置は、循環経路７に設けられた排気ガスを送風するための排気ガス循環ブロア１０と、循環経路７に設けられた、並列に並ぶ複数の分岐管１２、１３からなる並列配管１１と、並列配管１１の分岐管１２、１３の少なくとも１つに設けられた、分岐管における排気ガスの流通を選択的に遮断する遮断弁１４とから構成されている。
【００２１】
図１において、並列配管１１を構成する分岐管１２、１３は、それぞれに異なる配管の圧力損失特性を設定する。配管の圧力損失特性を設定する場合、たとえば、配管径を変更するのが安価で確実な流量制御を行なうことができるので好ましい。
【００２２】
また、分岐管１２、１３のそれぞれに手動弁１５を設けることにより、リジェネバーナの燃焼前に最適な圧力損失特性に設定することができる。
【００２３】
さらに、並列配管１１のうち少なくとも１つの分岐管１２に、遮断弁１４を設置しているので、流量調整器１７などからの信号をかかる遮断弁１４に送信して必要な排気ガス流量が得られる分岐管の遮断弁１４を開けたり、または閉めたりすることができる。なお、すべての分岐管１２、１３に遮断弁１４を設けてもよい。また、分岐管の本数も２本以上であればよく、循環量制御の精度の度合い（精度を上げれば本数が増える）に応じて適宜の本数を採用することができる。
【００２４】
遮断弁１４は、ＯＮ（開放）とＯＦＦ（遮断）のみの２動作だけを行なう単純な構成であるため、弁体の固着が起りにくいので、トラブルの発生頻度を減少することができる。このような遮断弁１４としては、電磁弁、高圧空気操作弁などを用いることができる。
【００２５】
さらに、図１に示されるように、循環経路７全体の排気ガスの流通を選択的に遮断する遮断弁１６をさらに備えていれば、排気ガスの循環の開始および停止を一括して制御することができるので好ましい。
【００２６】
前記遮断弁１４および１６の制御を行なうための流量調節器１７では、温度センサ１８、ガス流量測定器１９および燃焼空気量測定器２０などを用いて測定された炉温、燃焼負荷、燃焼空気量、燃焼ガス量または排気ガス循環率などのパラメータによって排ガス循環量を決定し、遮断弁１４および１６を所定の流量を得るように制御する。
【００２７】
２つの遮断弁１４および１６の開閉制御を行なうことにより、たとえば、表１および図２のグラフに示されるように３段階の排気ガス流量調節を行なうことができる。
【００２８】
【表１】

Figure 0003958942
【００２９】
表１および図２に示されるように、燃焼用空気量に応じて排気ガス循環量を最適に制御することができるため、従来の排気ガス循環機構と同様に、火炎温度や反応速度を低下させてＮＯｘの生成を低減させることが可能になる。
【００３０】
【発明の効果】
本発明によれば、遮断弁を備えた分岐管を含む複数の分岐管が並列に配置された並列配管を有することにより、並列配管の分岐管それぞれの単位で排気ガスの流量を制御することができるため、従来の流量調整弁への煤やスケールの付着による問題を低減することができる。その結果、循環する排気ガスの流量制御を長期的に安定して行なうことができ、しかも流量制御機構の設備費用を安価にすることができる。
【００３１】
また、並列配管の分岐管ごとに配管径を変更したり、または分岐管に燃焼前の初期調整用の手動弁を設けることにより、各分岐管ごとに最適な圧力損失特性を設定することができる。
【図面の簡単な説明】
【図１】本発明のリジェネバーナ用排気ガス循環装置の一実施の形態を示す排気ガス循環装置を備えたリジェネバーナの全体構成を概略的に示す説明図である。
【図２】図１の循環経路を流れる排気ガスの流量を示すグラフである。
【図３】従来の排気ガス循環装置を備えたリジェネバーナの全体構成を概略的に示す説明図である。
【符号の説明】
１ ラジアントチューブ
２ バーナ
３ 蓄熱体
１１ 並列配管
１２、１３ 分岐管
１４ 遮断弁
１５ 手動弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust gas circulation device for a regenerative burner. More specifically, the present invention relates to an exhaust gas circulation device for a regenerative burner that can stably control the flow rate of the exhaust gas that circulates for a long period of time, and that the equipment cost of the flow rate control mechanism is low.
[0002]
[Prior art]
In a relatively high-temperature heating zone such as a continuous annealing furnace or a heat treatment furnace, a radiant tube burner with a built-in heat exchanger is recently used as a heater for heating in the furnace from the viewpoint of energy saving. For example, a regenerative radiant tube burner (hereinafter referred to as a regenerative burner) having a built-in heat storage heat exchanger includes a pair of burners having heat storage bodies, and by burning the burners alternately, the combustion of one burner The heat of the generated exhaust gas is recovered by the heat storage body of the other burner.
[0003]
As shown in FIG. 3, the general regenerative burner is connected to a radiant tube 41, a pair of burners 42 having heat storage bodies 43 provided at both ends of the radiant tube 41, and the pair of burners 42. The two pairs of combustion air switching valve 44 and exhaust gas switching valve 45 are configured.
[0004]
By supplying combustion air from the combustion air blower 55 via the flow rate adjusting valve 56 and switching the two pairs of combustion air switching valves 44 and the exhaust gas switching valve 45 at predetermined time intervals (about 20 to 30 seconds). The air and fuel gas can be introduced into one burner that performs combustion, and exhaust and heat storage can be performed through the other non-burning burner.
[0005]
Such a regenerative burner raises the temperature of the combustion air to about 700 ° C. or higher, so that the generation of nitrogen oxide (hereinafter referred to as NOx) is remarkable. Therefore, in order to reduce the production of NOx, a method is generally used in which the flame temperature and reaction rate are reduced by a method in which a part of the exhaust gas is mixed with combustion air or combustion gas.
[0006]
As a method of mixing a part of the exhaust gas with the combustion air or the combustion gas, there are a self-circulation method using a discharge flow when the gas or air is ventilated in the main body part of the burner, and an air blower such as an exhaust gas circulation blower outside. There is a forced circulation system with means.
[0007]
For example, in the forced circulation type exhaust gas circulation device described in JP-A-52-14255, JP-A-56-25617, JP-A-8-61657, etc., as shown in FIG. Most of the exhaust gas passing through the switching valve 45 is exhausted from the chimney 46 to the outside of the furnace, but a part of the exhaust gas is sent from the chimney 46 to the circulation path 54 by the exhaust gas circulation blower 47. In the flow rate adjuster 48, the furnace temperature, combustion load, combustion air amount, combustion gas amount obtained by using the temperature sensor 50, the gas flow rate measuring device 51, the exhaust gas flow rate measuring device 52, the combustion air amount measuring device 53, etc. The exhaust gas circulation amount is determined by parameters such as the exhaust gas circulation rate, and the exhaust gas adjusting valve 49 is controlled to obtain a predetermined flow rate.
[0008]
[Problems to be solved by the invention]
However, when the self-circulation method is used, a supply facility for increasing the pressure of gas or air is expensive. Further, in the forced circulation system, an expensive flow rate control valve is required for adjusting the exhaust gas circulation amount, and soot and scale contained in the exhaust gas are bitten into the valve body and shaft of the flow rate control valve 49, The flow rate adjusting valve 49 frequently malfunctions, and it is difficult to control the flow rate of exhaust gas for a long time.
[0009]
The present invention has been made to solve such a problem. A regenerative burner that can stably control the flow rate of the exhaust gas that circulates for a long period of time and is inexpensive in equipment cost of the flow rate control mechanism. An object of the present invention is to provide an exhaust gas circulation device for use.
[0010]
[Means for Solving the Problems]
An exhaust gas circulation device for a regenerative burner according to the present invention comprises a regenerative burner provided with a circulation path for circulating exhaust gas exhausted from a regenerative burner to combustion air or a piping for supplying combustion gas of the regenerative burner. An exhaust gas circulation device for a regenerative burner for reducing nitrogen oxides discharged from a active burner,
(A) air blowing means provided in the circulation path;
(B) a parallel pipe comprising a plurality of branch pipes arranged in parallel provided in the circulation path;
(C) Among the branch pipes of the parallel pipe, at least one branch pipe obtained by subtracting 1 from the number of branch pipes is provided with blocking means for selectively blocking the flow of exhaust gas in the branch pipe. It is characterized by that.
[0011]
Each of the branch pipes of the parallel pipe preferably has different pressure loss characteristics.
[0012]
Each of the branch pipes of the parallel pipe preferably has different pressure loss characteristics by having different pipe diameters.
[0013]
Each of the branch pipes of the parallel pipe preferably has a manual valve for changing the setting of the pressure characteristic of the branch pipe.
[0014]
The shut-off means preferably comprises a shut-off valve operated by electricity or compressed air.
[0015]
It is preferable to further include a blocking means for selectively blocking the flow of exhaust gas in the entire circulation path.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, the exhaust gas circulation device for a regeneration burner according to the present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view schematically showing the entire configuration of a regenerative burner equipped with an exhaust gas circulation device showing an embodiment of an exhaust gas circulation device for a regeneration burner of the present invention, and FIG. 2 flows through the circulation path of FIG. It is a graph which shows the flow volume of exhaust gas.
[0017]
The regenerative burner provided with the exhaust gas circulation device according to the present embodiment shown in FIG. 1 serves as the means for controlling the flow rate of the exhaust gas in the circulation path 7 and performs the above-described multistage flow rate adjustment. A major feature is that a shutoff valve 14 that selectively shuts off at least one of the parallel pipe 11 and the branch pipes 12 and 13 of the parallel pipe 11 is employed instead of the regulating valve 49 (see FIG. 3). The configuration is almost the same as the regeneration burner system shown in FIG. Hereinafter, the regeneration burner system of FIG. 1 will be described in more detail.
[0018]
The regenerative burner shown in FIG. 1 includes a radiant tube 1, a pair of burners 2 having heat storage bodies 3 provided at both ends of the radiant tube 1, and two pairs of combustions respectively connected to the pair of burners 2. The air switching valve 4 and the exhaust gas switching valve 5 are configured. By supplying combustion air from the combustion air blower 8 via the flow rate adjusting valve 9 and switching the two pairs of combustion air switching valve 4 and exhaust gas switching valve 5 at predetermined time intervals (about 20 to 30 seconds). The air and fuel gas can be introduced into one burner that performs combustion, and exhaust and heat storage can be performed through the other non-burning burner.
[0019]
Furthermore, as shown in FIG. 1, most of the exhaust gas that passes through the exhaust gas switching valve 5 is exhausted from the chimney 6 to the outside of the furnace, but a part of the exhaust gas is sent to the circulation path 7.
[0020]
An exhaust gas circulation device shown in FIG. 1 includes an exhaust gas circulation blower 10 for blowing exhaust gas provided in a circulation path 7 and a plurality of branch pipes 12 and 13 provided in the circulation path 7 and arranged in parallel. And a shutoff valve 14 that is provided in at least one of the branch pipes 12 and 13 of the parallel pipe 11 and selectively shuts off the flow of the exhaust gas in the branch pipe.
[0021]
In FIG. 1, the branch pipes 12 and 13 constituting the parallel pipe 11 set different pressure loss characteristics of the pipes. When setting the pressure loss characteristic of the pipe, for example, it is preferable to change the pipe diameter because a cheap and reliable flow control can be performed.
[0022]
Moreover, by providing the manual valve 15 in each of the branch pipes 12 and 13, it is possible to set an optimum pressure loss characteristic before the combustion of the regeneration burner.
[0023]
Further, since the shutoff valve 14 is installed in at least one branch pipe 12 of the parallel pipe 11, a signal from the flow rate regulator 17 or the like is transmitted to the shutoff valve 14 to obtain a necessary exhaust gas flow rate. The shutoff valve 14 of the branch pipe can be opened or closed. In addition, you may provide the cutoff valve 14 in all the branch pipes 12 and 13. FIG. Further, the number of branch pipes may be two or more, and an appropriate number can be adopted according to the degree of accuracy of the circulation amount control (the number increases as the accuracy increases).
[0024]
Since the shut-off valve 14 has a simple configuration that performs only two operations of ON (opening) and OFF (shut-off), the valve body is less likely to stick, and the frequency of occurrence of trouble can be reduced. As such a shut-off valve 14, an electromagnetic valve, a high-pressure air operation valve, or the like can be used.
[0025]
Further, as shown in FIG. 1, if a shutoff valve 16 for selectively shutting off the exhaust gas circulation in the entire circulation path 7 is further provided, the start and stop of exhaust gas circulation can be controlled collectively. Is preferable.
[0026]
In the flow rate regulator 17 for controlling the shutoff valves 14 and 16, the furnace temperature, the combustion load, and the combustion air amount measured using the temperature sensor 18, the gas flow rate measuring device 19, the combustion air amount measuring device 20, and the like. The exhaust gas circulation amount is determined by a parameter such as the combustion gas amount or the exhaust gas circulation rate, and the shutoff valves 14 and 16 are controlled to obtain a predetermined flow rate.
[0027]
By performing opening / closing control of the two shut-off valves 14 and 16, for example, as shown in the graph of Table 1 and FIG. 2, the exhaust gas flow rate can be adjusted in three stages.
[0028]
[Table 1]
Figure 0003958942
[0029]
As shown in Table 1 and FIG. 2, since the exhaust gas circulation amount can be optimally controlled in accordance with the combustion air amount, the flame temperature and the reaction rate are reduced as in the conventional exhaust gas circulation mechanism. Thus, NOx generation can be reduced.
[0030]
【The invention's effect】
According to the present invention, the flow rate of the exhaust gas can be controlled in units of each branch pipe of the parallel pipe by having the parallel pipe in which a plurality of branch pipes including the branch pipe provided with the shut-off valve are arranged in parallel. Therefore, problems due to adhesion of soot and scale to the conventional flow rate regulating valve can be reduced. As a result, it is possible to stably control the flow rate of the exhaust gas that circulates for a long time, and to reduce the equipment cost of the flow rate control mechanism.
[0031]
In addition, the optimal pressure loss characteristics can be set for each branch pipe by changing the pipe diameter for each branch pipe of the parallel pipe or by providing a manual valve for initial adjustment before combustion in the branch pipe. .
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing an overall configuration of a regenerative burner equipped with an exhaust gas circulation device showing an embodiment of an exhaust gas circulation device for a regeneration burner of the present invention.
FIG. 2 is a graph showing the flow rate of exhaust gas flowing through the circulation path of FIG. 1;
FIG. 3 is an explanatory view schematically showing an overall configuration of a regenerative burner equipped with a conventional exhaust gas circulation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Radiant tube 2 Burner 3 Thermal storage body 11 Parallel piping 12, 13 Branch pipe 14 Shut-off valve 15 Manual valve

Claims (6)

リジェネレイティブバーナから排気される排気ガスを当該リジェネレイティブバーナの燃焼空気または燃焼ガス供給用配管へ循環させる循環経路を備えた、リジェネレイティブバーナから排出されるチッ素酸化物を低減するためのリジェネレイティブバーナ用排気ガス循環装置であって、
（ａ）前記循環経路に設けられた送風手段と、
（ｂ）前記循環経路に設けられた、並列に並ぶ複数の分岐管からなる並列配管と、
（ｃ）当該並列配管の分岐管のうち、少なくとも分岐管の数から１を減じた数の分岐管に設けられた、前記分岐管における排気ガスの流通を選択的に遮断する遮断手段とからなるリジェネレイティブバーナ用排気ガス循環装置。In order to reduce nitrogen oxides emitted from the regenerative burner, which has a circulation path for circulating the exhaust gas exhausted from the regenerative burner to the combustion air or the combustion gas supply pipe of the regenerative burner. An exhaust gas circulation device for a regenerative burner of
(A) air blowing means provided in the circulation path;
(B) a parallel pipe comprising a plurality of branch pipes arranged in parallel provided in the circulation path;
(C) Among the branch pipes of the parallel pipe, at least one branch pipe obtained by subtracting 1 from the number of branch pipes is provided with blocking means for selectively blocking the flow of exhaust gas in the branch pipe. Exhaust gas circulation device for regenerative burner. 前記並列配管の分岐管のそれぞれが、異なる圧力損失特性を有してなる請求項１記載のリジェネレイティブバーナ用排気ガス循環装置。The exhaust gas circulation device for a regenerative burner according to claim 1, wherein each of the branch pipes of the parallel pipe has different pressure loss characteristics. 前記並列配管の分岐管のそれぞれが、異なる配管径を有することにより、異なる圧力損失特性を有してなる請求項２記載のリジェネレイティブバーナ用排気ガス循環装置。The exhaust gas circulation device for a regenerative burner according to claim 2, wherein each of the branch pipes of the parallel pipe has a different pipe diameter, thereby having different pressure loss characteristics. 前記並列配管の分岐管のそれぞれが、当該分岐管の圧力特性の設定を変更するための手動弁を有してなる請求項２記載のリジェネレイティブバーナ用排気ガス循環装置。The regenerative burner exhaust gas circulation device according to claim 2, wherein each of the branch pipes of the parallel pipe has a manual valve for changing the setting of the pressure characteristic of the branch pipe. 前記遮断手段が、電気または圧縮空気により操作される遮断弁からなる請求項１、２、３または４記載のリジェネレイティブバーナ用排気ガス循環装置。The exhaust gas circulation device for a regenerative burner according to claim 1, 2, 3, or 4, wherein the shut-off means comprises a shut-off valve operated by electricity or compressed air. 前記循環経路全体の排気ガスの流通を選択的に遮断する遮断手段をさらに備えてなる請求項１、２、３、４または５記載のリジェネレイティブバーナ用排気ガス循環装置。The exhaust gas circulation device for a regenerative burner according to claim 1, 2, 3, 4, or 5, further comprising a blocking means for selectively blocking the flow of exhaust gas in the entire circulation path.
JP2001191496A 2001-06-25 2001-06-25 Exhaust gas circulation system for regenerative burner Expired - Fee Related JP3958942B2 (en)

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