JP2017113674A - Blower control method - Google Patents

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JP2017113674A
JP2017113674A JP2015249664A JP2015249664A JP2017113674A JP 2017113674 A JP2017113674 A JP 2017113674A JP 2015249664 A JP2015249664 A JP 2015249664A JP 2015249664 A JP2015249664 A JP 2015249664A JP 2017113674 A JP2017113674 A JP 2017113674A
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air supply
blower
supply pipe
air
control valve
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JP6316270B2 (en
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章生 橋本
Akio Hashimoto
章生 橋本
佳久 藤本
Yoshihisa Fujimoto
佳久 藤本
健一郎 森
Kenichiro Mori
健一郎 森
佑太郎 永井
Yutaro Nagai
佑太郎 永井
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Kawasaki Heavy Industries Ltd
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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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

PROBLEM TO BE SOLVED: To provide a blower control method enabling power consumption of a blower to be reduced.SOLUTION: The blower control method is provided for controlling at least one blower that supplies air to a plurality of reaction tanks via a manifold in a sewage treatment plant. One admission pipe among a plurality of admission pipes each connecting a plurality of the reaction tanks to the manifold is selected as a reference admission pipe. An actual pressure loss of an air flow control valve provided in the reference admission pipe is calculated based on an opening of the air flow control valve and a measured air flow rate in the reference admission pipe. A set pressure of the manifold is determined by PID control so that the calculated actual pressure loss agrees with a target pressure loss. At least one blower is controlled by PID control so that the measured pressure of the manifold agrees with the set pressure.SELECTED DRAWING: Figure 1

Description

本発明は、下水処理場における送風機の制御方法に関する。   The present invention relates to a blower control method in a sewage treatment plant.

下水処理場では、複数の送風機から集合管を介して複数の反応タンクに空気が供給される（例えば、特許文献１参照）。集合管と複数の反応タンクとは複数の給気管によってそれぞれ接続され、各給気管には風量制御弁が設けられる。一般的に、各風量制御弁は、対応する反応タンク内の汚水の溶存酸素濃度に基づいて制御される。一方、送風機は、集合管の測定圧力が設定圧力となるようにＰＩＤ制御される。   In a sewage treatment plant, air is supplied from a plurality of blowers to a plurality of reaction tanks via a collecting pipe (see, for example, Patent Document 1). The collecting pipe and the plurality of reaction tanks are respectively connected by a plurality of air supply pipes, and each air supply pipe is provided with an air volume control valve. Generally, each air volume control valve is controlled based on the dissolved oxygen concentration of the sewage in the corresponding reaction tank. On the other hand, the blower is PID controlled so that the measurement pressure of the collecting pipe becomes the set pressure.

実公平４−９５８号公報No. 4-958

ところで、下水処理場では、送風機の運転に要する電力が総消費電力のうちでかなり高い割合を占める。従って、送風機の運転に要する電力を削減することが望まれる。   By the way, in the sewage treatment plant, the electric power required for the operation of the blower accounts for a considerably high proportion of the total power consumption. Therefore, it is desired to reduce the power required for operating the blower.

そこで、本発明は、送風機の運転に要する電力を低減することができる送風機の制御方法を提供することを目的とする。   Then, an object of this invention is to provide the control method of the air blower which can reduce the electric power which driving | operation of an air blower requires.

前記課題を解決するために、本発明の発明者らは、鋭意研究の結果、従来の送風機の制御方法では、集合管の設定圧力が高く設定されて給気管の風量制御弁で大きな圧損が生じていることに着目し、これを改善することを考案した。本発明は、このような観点からなされたものである。   In order to solve the above-mentioned problems, the inventors of the present invention, as a result of earnest research, in the conventional blower control method, the set pressure of the collecting pipe is set high and a large pressure loss occurs in the air volume control valve of the supply pipe I devised to improve this. The present invention has been made from such a viewpoint.

すなわち、本発明の一つの側面からの送風機の制御方法は、下水処理場において集合管を介して複数の反応タンクに空気を供給する少なくとも１つの送風機の制御方法であって、前記集合管と前記複数の反応タンクとをそれぞれ接続する複数の給気管のうちの１つを基準給気管として選択し、前記基準給気管に設けられた風量制御弁の開度および前記基準給気管の測定風量に基づいて前記風量制御弁の実圧損を算出し、算出された実圧損が目標圧損となるようにＰＩＤ制御により前記集合管の設定圧力を決定し、前記集合管の測定圧力が前記設定圧力となるように前記少なくとも１つの送風機をＰＩＤ制御により制御する、ことを特徴とする。   That is, the method for controlling a blower according to one aspect of the present invention is a method for controlling at least one blower that supplies air to a plurality of reaction tanks via a collection pipe in a sewage treatment plant, the method comprising: One of a plurality of air supply pipes respectively connected to the plurality of reaction tanks is selected as a reference air supply pipe, and based on the opening degree of the air volume control valve provided in the reference air supply pipe and the measured air volume of the reference air supply pipe The actual pressure loss of the air flow control valve is calculated, the set pressure of the collecting pipe is determined by PID control so that the calculated actual pressure loss becomes the target pressure drop, and the measured pressure of the collecting pipe becomes the set pressure. The at least one blower is controlled by PID control.

上記の構成によれば、送風機の吐出圧力の目標値である集合管の設定圧力を、基準給気管に設けられた風量制御弁での実圧損が目標圧損となる程度に低く抑えることができる。従って、送風機の運転に要する電力を低減することができる。   According to the above configuration, the set pressure of the collecting pipe, which is the target value of the discharge pressure of the blower, can be suppressed to such an extent that the actual pressure loss at the air volume control valve provided in the reference air supply pipe becomes the target pressure loss. Therefore, the electric power required for the operation of the blower can be reduced.

前記複数の給気管のそれぞれについて、当該給気管に設けられた風量制御弁のＣＶ値を当該給気管の測定風量で割って選択参照値を算出し、算出された選択参照値のうちで最も高い選択参照値の給気管を前記基準給気管として選択してもよい。この構成によれば、風量制御弁の実圧損が最も低い給気管を基準給気管として選択することができる。   For each of the plurality of supply pipes, the selected reference value is calculated by dividing the CV value of the air volume control valve provided in the supply pipe by the measured air volume of the supply pipe, and is the highest of the calculated selection reference values An air supply pipe having a selected reference value may be selected as the standard air supply pipe. According to this configuration, the air supply pipe with the lowest actual pressure loss of the air volume control valve can be selected as the reference air supply pipe.

また、本発明の別の側面からの送風機の制御方法は、下水処理場において集合管を介して複数の反応タンクに空気を供給する少なくとも１つの送風機の制御方法であって、前記集合管と前記複数の反応タンクとをそれぞれ接続する複数の給気管のうちの１つを基準給気管として選択し、前記基準給気管に設けられた風量制御弁の開度が予め定められた目標開度となるようにＰＩＤ制御により前記集合管の設定圧力を決定し、前記集合管の測定圧力が前記設定圧力となるように前記少なくとも１つの送風機をＰＩＤ制御により制御する、ことを特徴とする。   A blower control method according to another aspect of the present invention is a control method for at least one blower that supplies air to a plurality of reaction tanks via a collection pipe in a sewage treatment plant, the collection pipe and the One of the plurality of air supply pipes respectively connecting the plurality of reaction tanks is selected as a reference air supply pipe, and the opening degree of the air volume control valve provided in the reference air supply pipe becomes a predetermined target opening degree. Thus, the set pressure of the collecting pipe is determined by PID control, and the at least one blower is controlled by PID control so that the measured pressure of the collecting pipe becomes the set pressure.

上記の構成によれば、送風機の吐出圧力の目標値である集合管の設定圧力を、基準給気管に設けられた風量制御弁での実圧損が目標圧損となる程度に低く抑えることができる。従って、送風機の運転に要する電力を低減することができる。   According to the above configuration, the set pressure of the collecting pipe, which is the target value of the discharge pressure of the blower, can be suppressed to such an extent that the actual pressure loss at the air volume control valve provided in the reference air supply pipe becomes the target pressure loss. Therefore, the electric power required for the operation of the blower can be reduced.

例えば、前記複数の給気管のそれぞれには風量制御弁が設けられており、前記複数の給気管のうちで風量制御弁の開度が最も大きい給気管を前記基準給気管として選択してもよい。   For example, each of the plurality of air supply pipes may be provided with an air flow control valve, and the air supply pipe with the largest opening of the air flow control valve may be selected as the reference air supply pipe among the plurality of air supply pipes. .

本発明によれば、送風機の運転に要する電力を低減することができる。   According to the present invention, it is possible to reduce the power required for operating the blower.

本発明の一実施形態に係る送風機の制御方法を実行する送風システムの概略構成図である。It is a schematic block diagram of the ventilation system which performs the control method of the air blower which concerns on one Embodiment of this invention. 風量制御弁の開度とＣＶ値の関係を示すグラフである。It is a graph which shows the relationship between the opening degree of a flow volume control valve, and CV value.

図１に、本発明の一実施形態に係る送風機の制御方法を実行する、下水処理場における送風システム１を示す。下水処理場は、汚水を貯留する複数の反応タンク１１を含み、送風システム１は、それらの反応タンク１１に集合管３を介して空気を供給する複数の送風機２を含む。ただし、送風機２は必ずしも複数設けられている必要はなく、１つだけ設けられていてもよい。   FIG. 1 shows a blower system 1 in a sewage treatment plant that executes a blower control method according to an embodiment of the present invention. The sewage treatment plant includes a plurality of reaction tanks 11 that store sewage, and the blower system 1 includes a plurality of blowers 2 that supply air to the reaction tanks 11 through a collecting pipe 3. However, a plurality of blowers 2 are not necessarily provided, and only one blower 2 may be provided.

本実施形態では、送風システム１が反応タンク１１と同数の溶存酸素制御装置５１および風量制御装置５２を含むとともに、１つの圧力制御装置５３を含む。ただし、全ての溶存酸素制御装置５１および風量制御装置５２が１つのユニットとして構成されていてもよいし、全ての風量制御装置５２および圧力制御装置５３が１つのユニットとして構成されていてもよい。   In the present embodiment, the air blowing system 1 includes the same number of dissolved oxygen control devices 51 and air volume control devices 52 as the reaction tank 11 and one pressure control device 53. However, all the dissolved oxygen control devices 51 and the air volume control devices 52 may be configured as one unit, or all the air volume control devices 52 and the pressure control devices 53 may be configured as one unit.

具体的に、各送風機２は、吐出管２１により集合管３と接続されている。集合管３には、全ての送風機２から当該集合管３に集められた空気の圧力を測定する圧力計３１と、当該集合管３内の空気の温度を測定する温度計３２が設けられている。なお、温度計３２は、各吐出管２１に設けられていてもよい。   Specifically, each blower 2 is connected to the collecting pipe 3 by a discharge pipe 21. The collecting pipe 3 is provided with a pressure gauge 31 that measures the pressure of the air collected in the collecting pipe 3 from all the fans 2 and a thermometer 32 that measures the temperature of the air in the collecting pipe 3. . The thermometer 32 may be provided in each discharge pipe 21.

各送風機２は、圧力制御装置５３により制御される。圧力制御装置５３には、圧力計３１からの測定圧力Ｐｎと温度計３２からの測定温度Ｔが入力される。圧力制御装置５３は、集合管３の測定圧力Ｐｎに基づいて送風機２の運転台数を決定するとともに、運転される送風機２を、集合管３の測定圧力Ｐｎが設定圧力Ｐｓとなるように各送風機２の風量設定を変えることでＰＩＤ制御する。   Each blower 2 is controlled by a pressure control device 53. The pressure control device 53 receives the measured pressure Pn from the pressure gauge 31 and the measured temperature T from the thermometer 32. The pressure control device 53 determines the number of fans 2 to be operated based on the measured pressure Pn of the collecting pipe 3, and sets each of the blowers 2 to be operated so that the measured pressure Pn of the collecting pipe 3 becomes the set pressure Ps. PID control is performed by changing the air volume setting of 2.

集合管３は、複数の給気管４により反応タンク１１とそれぞれ接続されている。各給気管４には、当該給気管４の風量を変更する風量制御弁４２が設けられている。また、各給気管４には、当該給気管４の風量を測定する風量計４１が設けられている。図例では、風量計４１が風量制御弁４２の上流側に位置しているが、風量制御弁４２の下流側に位置していてもよい。各風量制御弁４２は、風量制御装置５２により制御される。風量制御装置５２には、風量計４１からの測定風量Ｑｎが入力される。   The collecting pipe 3 is connected to the reaction tank 11 by a plurality of air supply pipes 4. Each air supply pipe 4 is provided with an air volume control valve 42 for changing the air volume of the air supply pipe 4. Each air supply pipe 4 is provided with an air flow meter 41 for measuring the air volume of the air supply pipe 4. In the illustrated example, the air flow meter 41 is located upstream of the air flow control valve 42, but may be located downstream of the air flow control valve 42. Each air volume control valve 42 is controlled by an air volume control device 52. The measured air volume Qn from the anemometer 41 is input to the air volume control device 52.

各給気管４は反応タンク１１内まで延びており、給気管４の先端には散気パネル４３が設けられている。各反応タンク１１には、当該反応タンク１１内の汚水の溶存酸素濃度ＤＯを測定する溶存酸素濃度計１２が設けられている。溶存酸素濃度計１２で測定された溶存酸素濃度ＤＯは、対応する溶存酸素制御装置５１に入力される。   Each air supply pipe 4 extends into the reaction tank 11, and an air diffusion panel 43 is provided at the tip of the air supply pipe 4. Each reaction tank 11 is provided with a dissolved oxygen concentration meter 12 for measuring the dissolved oxygen concentration DO of sewage in the reaction tank 11. The dissolved oxygen concentration DO measured by the dissolved oxygen concentration meter 12 is input to the corresponding dissolved oxygen control device 51.

各溶存酸素制御装置５１は、溶存酸素濃度ＤＯに基づいて、対応する反応タンク１１に対する要求風量Ｑｓを決定する。要求風量Ｑｓは、対応する風量制御装置５２に送信される。   Each dissolved oxygen control device 51 determines the required air volume Qs for the corresponding reaction tank 11 based on the dissolved oxygen concentration DO. The requested air volume Qs is transmitted to the corresponding air volume control device 52.

各風量制御装置５２は、風量計４１からの測定風量Ｑｎが要求風量Ｑｓとなるように風量制御弁４２の開度Ｘを調整する。各風量制御装置５２から圧力制御装置５３へは、風量制御弁４２の開度Ｘと測定風量Ｑｎが送信される。   Each air volume control device 52 adjusts the opening degree X of the air volume control valve 42 so that the measured air volume Qn from the air volume meter 41 becomes the required air volume Qs. The opening degree X of the air volume control valve 42 and the measured air volume Qn are transmitted from each air volume control device 52 to the pressure control device 53.

圧力制御装置５３は、まず、給気管４のうちの１つを基準給気管として選択する。圧力制御装置５３には、各給気管４に設けられた風量制御弁４２のＣＶ値に関する性能曲線が予め格納されている。ＣＶ値は、風量制御弁４２の容量を示す数値であり、図２に示すように開度Ｘが大きくなると高くなる。   First, the pressure control device 53 selects one of the supply pipes 4 as a reference supply pipe. In the pressure control device 53, a performance curve related to the CV value of the air volume control valve 42 provided in each air supply pipe 4 is stored in advance. The CV value is a numerical value indicating the capacity of the air volume control valve 42 and increases as the opening degree X increases as shown in FIG.

圧力制御装置５３は、各給気管４について、現在の開度Ｘでの風量制御弁４２のＣＶ値を当該給気管４の測定風量Ｑｎで割って選択参照値（＝ＣＶ／Ｑｎ）を算出する。その後、圧力制御装置５３は、算出された選択参照値のうちで最も高い選択参照値の給気管４を基準給気管として選択する。   The pressure control device 53 calculates the selected reference value (= CV / Qn) for each air supply pipe 4 by dividing the CV value of the air volume control valve 42 at the current opening degree X by the measured air volume Qn of the air supply pipe 4. . Thereafter, the pressure control device 53 selects the supply pipe 4 having the highest selected reference value among the calculated selected reference values as the reference supply pipe.

次に、圧力制御装置５３は、基準給気管に設けられた風量制御弁４２の開度Ｘおよび基準給気管の測定風量Ｑｎに基づいて集合管３の設定圧力Ｐｓを決定する。まず、圧力制御装置５３は、現在の開度Ｘでの風量制御弁４２のＣＶ値、測定風量Ｑｎおよび測定温度Ｔを用いて、例えば、以下の式１により、風量制御弁４２の実圧損ΔＰｎを算出する。   Next, the pressure control device 53 determines the set pressure Ps of the collecting pipe 3 based on the opening degree X of the air volume control valve 42 provided in the reference air supply pipe and the measured air volume Qn of the reference air supply pipe. First, the pressure control device 53 uses the CV value, the measured air volume Qn, and the measured temperature T of the air volume control valve 42 at the current opening degree X, for example, according to the following formula 1, the actual pressure loss ΔPn of the air volume control valve 42: Is calculated.

Figure 2017113674
各記号の単位 ΔＰｎ：ｋｇ／ｃｍ2
Ｑｎ：ｍ3／ｍｉｎ
Ｔ：Ｋ
Ｐ１，Ｐ２：ｋｇ／ｃｍ2 ａｂｓ
Figure 2017113674
 Unit of each symbol ΔPn: kg / cm 2
Qn: m 3 / min
T: K
P1, P2: kg / cm 2 abs

式中のＰ１およびＰ２は、それぞれ風量制御弁４２の入口および出口の圧力である。ただし、式１の計算結果に対するＰ１，Ｐ２の影響は小さいため、本実施形態では、Ｐ１，Ｐ２に固定値を採用している。   P1 and P2 in the equation are the pressures at the inlet and the outlet of the air volume control valve 42, respectively. However, since the influence of P1 and P2 on the calculation result of Expression 1 is small, in this embodiment, fixed values are adopted for P1 and P2.

ついで、圧力制御装置５３は、算出された実圧損ΔＰｎが目標圧損ΔＰｓ（例えば、２ｋＰａ）となるように、ＰＩＤ制御により集合管３の設定圧力Ｐｓを決定する。具体的には、実圧損ΔＰｎが目標圧損ΔＰｓよりも小さければ、それらの偏差（ΔＰｓ−ΔＰｎ）に応じて設定圧力Ｐｓを現在の値よりも大きくし、逆に実圧損ΔＰｎが目標圧損ΔＰｓよりも大きければ、それらの偏差（ΔＰｎ−ΔＰｓ）に応じて設定圧力Ｐｓを現在の値よりも小さくする。設定圧力Ｐｓを決定した後は、圧力制御装置５３は、上述したように集合管３の測定圧力Ｐｎが設定圧力Ｐｓとなるように各送風機２の風量設定を変えることで送風機２をＰＩＤ制御する。なお、設定圧力Ｐｓを決定する演算およびＰＩＤ制御は専用の演算器および制御装置で行い、決定された設定圧力Ｐｓを圧力制御装置５３へ入力してもよい。   Next, the pressure control device 53 determines the set pressure Ps of the collecting pipe 3 by PID control so that the calculated actual pressure loss ΔPn becomes the target pressure loss ΔPs (for example, 2 kPa). Specifically, if the actual pressure loss ΔPn is smaller than the target pressure loss ΔPs, the set pressure Ps is made larger than the current value according to the deviation (ΔPs−ΔPn), and conversely, the actual pressure loss ΔPn is greater than the target pressure loss ΔPs. Is larger, the set pressure Ps is made smaller than the current value in accordance with the deviation (ΔPn−ΔPs). After determining the set pressure Ps, the pressure control device 53 performs PID control of the blower 2 by changing the air volume setting of each blower 2 so that the measured pressure Pn of the collecting pipe 3 becomes the set pressure Ps as described above. . The calculation and PID control for determining the set pressure Ps may be performed by a dedicated calculator and control device, and the determined set pressure Ps may be input to the pressure control device 53.

以上説明したように、本実施形態では、送風機２の吐出圧力の目標値である集合管３の設定圧力Ｐｓを、基準給気管に設けられた風量制御弁４２での実圧損ΔＰｎが目標圧損ΔＰｓとなる程度に低く抑えることができる。従って、送風機２の運転に要する電力を低減することができる。   As described above, in the present embodiment, the set pressure Ps of the collecting pipe 3 that is the target value of the discharge pressure of the blower 2 is set to the target pressure loss ΔPs by the actual pressure loss ΔPn at the air volume control valve 42 provided in the reference air supply pipe. Can be kept low. Therefore, the electric power required for the operation of the blower 2 can be reduced.

また、本実施形態では、全ての給気管４について選択参照値が算出され、これらの選択参照値の比較により基準給気管が選択されるので、風量制御弁４２の実圧損ΔＰｎが最も低い給気管４を基準給気管として選択することができる。   In the present embodiment, the selected reference value is calculated for all the supply pipes 4, and the reference supply pipe is selected by comparing these selection reference values. Therefore, the supply pipe with the lowest actual pressure loss ΔPn of the air volume control valve 42 is selected. 4 can be selected as the reference air supply pipe.

＜変形例＞
圧力制御装置５３は、基準給気管の実圧損ΔＰｎを算出する代わりに、基準給気管に設けられた風量制御弁４２の開度Ｘが予め定められた目標開度Ｘｓとなるように、集合管３の設定圧力ＰｓをＰＩＤ制御により決定してもよい。具体的には、現在の開度Ｘが目標開度Ｘｓよりも小さければ、それらの偏差（Ｘｓ−Ｘ）に応じて設定圧力Ｐｓを現在の値よりも小さくし、現在の開度Ｘが目標開度Ｘｓよりも大きければ、それらの偏差（Ｘ−Ｘｓ）に応じて設定圧力Ｐｓを現在の値よりも大きくする。 <Modification>
Instead of calculating the actual pressure loss ΔPn of the reference air supply pipe, the pressure control device 53 collects the collecting pipe so that the opening X of the air volume control valve 42 provided in the reference air supply pipe becomes a predetermined target opening Xs. The set pressure Ps of 3 may be determined by PID control. Specifically, if the current opening degree X is smaller than the target opening degree Xs, the set pressure Ps is made smaller than the current value in accordance with the deviation (Xs−X), and the current opening degree X becomes the target. If it is larger than the opening degree Xs, the set pressure Ps is made larger than the current value in accordance with the deviation (X−Xs).

本変形例では、圧力制御装置５３が、給気管４のうちで風量制御弁４２の開度Ｘが最も大きい給気管４を基準給気管として選択する。ただし、前記実施形態と同様に、圧力制御装置５３が、各給気管４について選択参照値を算出し、算出された選択参照値のうちで最も高い選択参照値の給気管４を基準給気管として選択してもよい。目標開度Ｘｓは、例えば３０〜６０％の範囲内でオペレータにより任意に設定される。   In this modification, the pressure control device 53 selects the air supply pipe 4 having the largest opening degree X of the air volume control valve 42 among the air supply pipes 4 as the reference air supply pipe. However, as in the above-described embodiment, the pressure control device 53 calculates the selection reference value for each supply pipe 4, and the supply pipe 4 with the highest selected reference value among the calculated selection reference values is used as the reference supply pipe. You may choose. The target opening Xs is arbitrarily set by the operator within a range of 30 to 60%, for example.

本変形例では、前記実施形態に比べて送風機２の運転に要する電力の低減効果が小さくなるものの、前記実施形態と同様の効果を得ることができる。しかも、本変形例では、開度ＸのＣＶ値への換算および実圧損ΔＰｎの算出が不要であるために、制御用のプログラムを簡易化することができる。   In this modification, although the effect of reducing the power required for the operation of the blower 2 is smaller than that in the embodiment, the same effect as in the embodiment can be obtained. In addition, in this modification, since the conversion of the opening degree X into the CV value and the calculation of the actual pressure loss ΔPn are unnecessary, the control program can be simplified.

（その他の実施形態）
本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変形が可能である。 (Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

例えば、前記実施形態では、圧力制御装置５３が各給気管４の選択参照値を算出しているが、各風量制御装置５２に風量制御弁４２のＣＶ値に関する性能曲線が予め格納され、各風量制御装置５２が対応する給気管４の選択参照値を算出してもよい。   For example, in the above-described embodiment, the pressure control device 53 calculates the selected reference value for each air supply pipe 4, but each air volume control device 52 stores in advance a performance curve related to the CV value of the air volume control valve 42, and each air volume. The control device 52 may calculate the selected reference value of the corresponding supply pipe 4.

また、前記実施形態において、基準給気管の選択は、必ずしも選択参照値の比較によって行われる必要はなく、例えば、給気管４のうちで風量制御弁４２の開度Ｘが最も大きい給気管４が基準給気管として選択されてもよい。   In the above embodiment, the selection of the reference air supply pipe does not necessarily have to be performed by comparing the selection reference values. For example, among the air supply pipes 4, the air supply pipe 4 with the largest opening X of the air volume control valve 42 is selected. It may be selected as a reference air supply pipe.

また、各反応タンク１１に対する要求風量Ｑｓは、必ずしも溶存酸素濃度ＤＯに基づいて決定される必要はなく、例えば、汚水中の硝酸濃度やアンモニア濃度に基づいて決定されてもよいし、反応タンク１１への汚水流入量に係数を積算して算出されてもよい。   Further, the required air volume Qs for each reaction tank 11 is not necessarily determined based on the dissolved oxygen concentration DO, and may be determined based on, for example, the nitric acid concentration or ammonia concentration in the sewage. It may be calculated by adding a coefficient to the amount of inflow of sewage into the water.

１ 送風システム
１１ 反応タンク
２ 送風機
３ 集合管
４ 給気管
４２ 風量制御弁
４３ 散気パネル DESCRIPTION OF SYMBOLS 1 Blower system 11 Reaction tank 2 Blower 3 Collecting pipe 4 Air supply pipe 42 Air flow control valve 43 Air diffuser panel

Claims (4)

下水処理場において集合管を介して複数の反応タンクに空気を供給する少なくとも１つの送風機の制御方法であって、
前記集合管と前記複数の反応タンクとをそれぞれ接続する複数の給気管のうちの１つを基準給気管として選択し、
前記基準給気管に設けられた風量制御弁の開度および前記基準給気管の測定風量に基づいて前記風量制御弁の実圧損を算出し、算出された実圧損が目標圧損となるようにＰＩＤ制御により前記集合管の設定圧力を決定し、
前記集合管の測定圧力が前記設定圧力となるように前記少なくとも１つの送風機をＰＩＤ制御により制御する、送風機の制御方法。 A control method for at least one blower for supplying air to a plurality of reaction tanks via a collecting pipe in a sewage treatment plant,
Selecting one of a plurality of air supply pipes respectively connecting the collecting pipe and the plurality of reaction tanks as a reference air supply pipe;
The actual pressure loss of the air volume control valve is calculated based on the opening degree of the air volume control valve provided in the reference air supply pipe and the measured air volume of the reference air supply pipe, and PID control is performed so that the calculated actual pressure loss becomes the target pressure loss. To determine the set pressure of the collecting pipe,
A blower control method, wherein the at least one blower is controlled by PID control so that a measured pressure of the collecting pipe becomes the set pressure. 前記複数の給気管のそれぞれについて、当該給気管に設けられた風量制御弁のＣＶ値を当該給気管の測定風量で割って選択参照値を算出し、
算出された選択参照値のうちで最も高い選択参照値の給気管を前記基準給気管として選択する、請求項１に記載の送風機の制御方法。 For each of the plurality of air supply pipes, the selected reference value is calculated by dividing the CV value of the air volume control valve provided in the air supply pipe by the measured air volume of the air supply pipe,
The blower control method according to claim 1, wherein an air supply pipe having the highest selected reference value among the calculated selection reference values is selected as the reference air supply pipe. 下水処理場において集合管を介して複数の反応タンクに空気を供給する少なくとも１つの送風機の制御方法であって、
前記集合管と前記複数の反応タンクとをそれぞれ接続する複数の給気管のうちの１つを基準給気管として選択し、
前記基準給気管に設けられた風量制御弁の開度が予め定められた目標開度となるようにＰＩＤ制御により前記集合管の設定圧力を決定し、
前記集合管の測定圧力が前記設定圧力となるように前記少なくとも１つの送風機をＰＩＤ制御により制御する、送風機の制御方法。 A control method for at least one blower for supplying air to a plurality of reaction tanks via a collecting pipe in a sewage treatment plant,
Selecting one of a plurality of air supply pipes respectively connecting the collecting pipe and the plurality of reaction tanks as a reference air supply pipe;
The set pressure of the collecting pipe is determined by PID control so that the opening degree of the air volume control valve provided in the reference air supply pipe becomes a predetermined target opening degree,
A blower control method, wherein the at least one blower is controlled by PID control so that a measured pressure of the collecting pipe becomes the set pressure. 前記複数の給気管のそれぞれには風量制御弁が設けられており、
前記複数の給気管のうちで風量制御弁の開度が最も大きい給気管を前記基準給気管として選択する、請求項３に記載の送風機の制御方法。
Each of the plurality of supply pipes is provided with an air volume control valve,
The blower control method according to claim 3, wherein an air supply pipe having the largest opening of an air flow control valve is selected as the reference air supply pipe among the plurality of air supply pipes.
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JP2020151627A (en) * 2019-03-18 2020-09-24 住友重機械エンバイロメント株式会社 Aeration system, method of operating aeration system, and method of replacing blower
CN113864224A (en) * 2021-11-30 2021-12-31 华电电力科学研究院有限公司 Double-fan control method, device and equipment and double-fan system

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CN113864224A (en) * 2021-11-30 2021-12-31 华电电力科学研究院有限公司 Double-fan control method, device and equipment and double-fan system
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