JP2009279465A - Apparatus for neutralizing alkaline waste water - Google Patents
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本発明は、ボイラーのブロー排水など、各種工場から排出されるアルカリ排水をＣＯ2 含有ガスによって中和処理するアルカリ排水中和装置に関する。 The present invention relates to an alkaline wastewater neutralizer for neutralizing alkaline wastewater discharged from various factories, such as blower wastewater from a boiler, with a CO 2 -containing gas.
火力発電所を始めとする多くの工業分野で多種多様なボイラーが使用されている。そのボイラーは高温に加熱されるため激しい腐食環境にあり、このためボイラーを構成する材料に高耐食性金属材料が使用されると共に、ボイラー水としてｐＨが１１〜１２というような高アルカリ水が使用される。その結果、ボイラーへの給水に伴ってボイラーから排出されるいわゆるブロー排水も高アルカリ水となり、その中和処理が必要となる。 A wide variety of boilers are used in many industrial fields, including thermal power plants. Since the boiler is heated to a high temperature, it is in a severe corrosive environment. For this reason, a highly corrosive metal material is used as the material constituting the boiler, and high alkaline water having a pH of 11 to 12 is used as the boiler water. The As a result, so-called blow drainage discharged from the boiler as water is supplied to the boiler also becomes highly alkaline water and needs to be neutralized.
ボイラーブロー排水の中和処理の一つとして、そのボイラーで生じる燃焼排ガスを用いる方法が、特許文献１により提示されている。また、燃焼排ガスを用いる効率的な中和装置として、複数の中和槽をタンデムに連結して使用するものが、特許文献２により提示されている。 Patent Document 1 proposes a method of using combustion exhaust gas generated in a boiler as one of the neutralization treatment of boiler blow drainage. Further, Patent Document 2 proposes an efficient neutralization apparatus using combustion exhaust gas that uses a plurality of neutralization tanks connected in tandem.
燃焼排ガスを用いる中和処理は、薬剤を使用しないために後処理の必要がなく、薬剤コストも節減できる。特に、特許文献２に記載された中和装置は、タンデムに連結された複数の中和槽を使用し、２槽型の場合、原水であるアルカリ排水は第１の中和槽へ導入され、その中和槽から第２の中和槽へ送られる。燃焼排ガスは、第１の中和槽及び第２の中和槽へそれぞれ供給され、各槽で燃焼排ガスによる中和処理が行われる。 Since the neutralization process using combustion exhaust gas does not use a chemical, no post-treatment is required, and the chemical cost can be reduced. In particular, the neutralization device described in Patent Document 2 uses a plurality of neutralization tanks connected to a tandem, and in the case of a two tank type, alkaline drainage that is raw water is introduced into the first neutralization tank, The neutralization tank is sent to the second neutralization tank. The combustion exhaust gas is supplied to the first neutralization tank and the second neutralization tank, respectively, and neutralization treatment with the combustion exhaust gas is performed in each tank.
この結果、例えばｐＨが１２〜１１のアルカリ排水が第１の中和槽でｐＨ９〜８まで中和され、第２の中和槽でｐＨ８以下まで中和される。このタンデム処理により、燃焼排ガス中のＣＯ2 濃度が数〜１０容量％であっても、処理効率が高いために、必要な燃焼排ガス量を低減できるとされている。 As a result, for example, alkaline drainage having a pH of 12 to 11 is neutralized to pH 9 to 8 in the first neutralization tank and neutralized to pH 8 or less in the second neutralization tank. According to this tandem treatment, even if the CO 2 concentration in the combustion exhaust gas is several to 10% by volume, the treatment efficiency is high, so that the necessary amount of combustion exhaust gas can be reduced.
しかしながら、この中和装置は１槽式に比べると能力が高いが、個々の中和槽での処理能力が高くないため、装置全体としての効率はさほど高くなく、処理水量に対する燃焼排ガス必要量は依然として多い。また、槽数に比例して装置規模が増大するため、設備コストが高いという問題もある。このため、従来より更に小型で高性能な中和装置が求められている。 However, this neutralizer has a higher capacity than the single tank type, but the processing capacity in each neutralizer is not high, so the efficiency of the entire apparatus is not so high, and the required amount of combustion exhaust gas relative to the amount of treated water is Still many. Moreover, since the apparatus scale increases in proportion to the number of tanks, there is also a problem that the equipment cost is high. For this reason, there is a need for a neutralizing device that is smaller and has higher performance than conventional ones.
本発明の目的は、中和剤としてＣＯ2 含有ガスを使用するにもかかわらず、小型で高性能なアルカリ排水中和装置を提供することにある。 An object of the present invention is to provide a small-size and high-performance alkaline wastewater neutralizing apparatus despite the use of a CO 2 -containing gas as a neutralizing agent.
上記目的を達成するために、本発明のアルカリ排水中和装置は、中和処理すべきアルカリ排水が上部から導入される気液接触筒が貯水槽の上方に連設された処理装置と、処理装置の貯水槽に付設され、ＣＯ2 含有ガスを中和剤として貯水槽内の被処理水に注入する散気装置とを具備しており、貯水槽内の被処理水に注入されたＣＯ2 含有ガスが気液接触筒の上部から筒外へ排出され、貯水槽から槽外へ処理水が導出されるように構成されている。 In order to achieve the above object, the alkaline wastewater neutralization apparatus of the present invention includes a treatment device in which a gas-liquid contact cylinder into which alkaline wastewater to be neutralized is introduced from above is continuously provided above the water storage tank, and a treatment CO 2 is attached to the water tank of the apparatus and infuses CO 2 -containing gas into the water to be treated in the water tank as a neutralizing agent. CO 2 injected into the water to be treated in the water tank The contained gas is discharged from the upper part of the gas-liquid contact cylinder to the outside of the cylinder, and the treated water is led out from the water storage tank to the outside of the tank.
本発明のアルカリ排水中和装置においては、原水であるアルカリ排水は、処理装置における気液接触筒の上部から筒内へ導入され、気液接触筒内を流下して下方の貯水槽に滞留する。一方、ＣＯ2 含有ガスは、処理装置の貯水槽に付設された散気装置により槽内の被処理水中へ注入され、気液接触筒内を経てその上部から筒外へ排出される。 In the alkaline drainage neutralization apparatus of the present invention, the alkaline drainage which is raw water is introduced into the cylinder from the upper part of the gas-liquid contact cylinder in the treatment apparatus, flows down in the gas-liquid contact cylinder and stays in the lower water storage tank. . On the other hand, the CO 2 -containing gas is injected into the water to be treated in the tank by an air diffuser attached to the water storage tank of the processing apparatus, and is discharged from the upper part through the gas-liquid contact cylinder.
これにより、原水であるアルカリ排水は、第１段階として、処理装置の気液接触筒内でＣＯ2 含有ガスと向流接触して中和処理される。その後、第２段階として、貯水槽内で、散気装置から注入されるＣＯ2 含有ガスと接触し中和処理される。このような２段階処理により、本発明のアルカリ排水中和装置においては、小型の設備で高効率な中和処理が行われる。 As a result, the alkaline drainage that is the raw water is neutralized by countercurrent contact with the CO 2 -containing gas in the gas-liquid contact cylinder of the processing apparatus as the first stage. Thereafter, as a second stage, the CO 2 -containing gas injected from the air diffuser is brought into contact with the CO 2 -containing gas in the water tank and neutralized. By such a two-stage process, the alkaline wastewater neutralization apparatus of the present invention performs a highly efficient neutralization process with a small facility.
本発明のアルカリ排水中和装置においては、貯水槽内の被処理水を槽外へ抜き出して気液接触筒の上部から筒内へ再導入する循環系を設けるのがよい。そうすると、貯水槽内の被処理水の一部は、循環系により気液接触筒の上部から筒内へ再導入され、処理装置を循環することにより、２段階処理を繰り返し受け、ルカリ排水が一つの処理装置内においてＣＯ2 含有ガスと何回も接触するので、処理効率が更に向上する。 In the alkaline wastewater neutralization apparatus of the present invention, it is preferable to provide a circulation system for extracting the water to be treated in the water storage tank out of the tank and reintroducing it into the cylinder from the upper part of the gas-liquid contact cylinder. Then, a part of the water to be treated in the water tank is reintroduced into the cylinder from the upper part of the gas-liquid contact cylinder by the circulation system, and is repeatedly subjected to the two-stage treatment by circulating through the treatment apparatus, so Since the CO 2 -containing gas is contacted many times in one processing apparatus, the processing efficiency is further improved.
散気装置としては、ＣＯ2 含有ガスを自ら吸引して貯水槽内の被処理水に注入する自吸式散気装置が、高効率であり、好ましい。 As the air diffuser, a self-priming air diffuser that sucks CO 2 -containing gas by itself and injects it into the water to be treated in the water storage tank is highly efficient and preferable.
本発明のアルカリ排水中和装置は、ボイラーのブロー水の中和処理に特に好適である。なぜなら、ボイラーのブロー水の中和処理に本発明を適用した場合、そのボイラーで生じる燃焼排ガスをＣＯ2 含有ガスとして利用でき、自己完結型のシステムを構成することができるからである。 The alkaline wastewater neutralization apparatus of the present invention is particularly suitable for the neutralization treatment of boiler blow water. This is because when the present invention is applied to the neutralization treatment of the blow water of the boiler, the combustion exhaust gas generated in the boiler can be used as the CO 2 -containing gas, and a self-contained system can be configured.
気液接触筒へアルカリ排水を供給する原水供給系に流量制御弁を設け、貯水槽から導出される処理水のｐＨ値が目標範囲内に管理されるように、開閉制御または流量制御を行うならば、処理水のより厳密なｐＨ管理が可能となる。 If the raw water supply system that supplies alkaline drainage to the gas-liquid contact cylinder is equipped with a flow control valve, and the open / close control or flow control is performed so that the pH value of the treated water derived from the water storage tank is managed within the target range If this is the case, stricter pH control of the treated water becomes possible.
吸気式散気装置へＣＯ2 含有ガスを供給するガス供給系に対して、バックアップ用のＣＯ2 ガスボンベを接続可能とすることにより、必要量のＣＯ2 含有ガスを確保できない場合でも、アルカリ排水の処理量を減らすことなく中和処理を続けることができ、ボイラーの燃焼排ガスを使用する場合は、ボイラーの負荷変動の影響を受けることなく安定的に中和処理を行うことができる。 Even if the required amount of CO 2 -containing gas cannot be secured by making it possible to connect a CO 2 gas cylinder for backup to the gas supply system that supplies CO 2 -containing gas to the intake air diffuser, Neutralization can be continued without reducing the amount of treatment, and when boiler combustion exhaust gas is used, neutralization can be performed stably without being affected by boiler load fluctuations.
本発明のアルカリ排水中和装置は、貯水槽の上に気液接触筒を連結した処理装置において、アルカリ排水をＣＯ2 含有ガスと何回も繰り返し接触させるので、ガス中のＣＯ2 を有効利用でき、処理効率に著しく優れる。このため、小型で安価な設備により多量のアルカリ排水を処理でき、設備コスト低減、及び処理コスト低減の両方に大きな効果を発揮する。 Alkaline wastewater neutralizing device of the invention, effective utilization in the processing devices coupled to the gas-liquid contact cylinder on the water tank, since to repeated contact with alkaline waste water containing CO 2 gas and many times, the CO 2 in the gas The processing efficiency is extremely excellent. For this reason, a large amount of alkaline drainage can be treated with a small and inexpensive facility, and a great effect is exhibited in both reducing the facility cost and the treatment cost.
以下に本発明の実施形態を図面に基づいて説明する。図１は本発明の一実施形態を示すアルカリ排水中和装置の構成図である。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an alkaline drainage neutralizing apparatus showing an embodiment of the present invention.
本実施形態のアルカリ排水中和装置は、ボイラー１０から排出される高アルカリのブロー水を、当該ボイラー１０で生じる燃焼排ガスを利用して中和処理するものであり、その中和処理のために、ブロー水を燃焼排ガスと接触させて中和処理する縦型の処理装置２０を具備している。 The alkaline wastewater neutralization apparatus of the present embodiment neutralizes high alkali blow water discharged from the boiler 10 by using combustion exhaust gas generated in the boiler 10 for the neutralization treatment. A vertical processing apparatus 20 is provided for neutralizing the blow water by bringing it into contact with the combustion exhaust gas.
縦型の処理装置２０は、被処理水を貯留する貯水槽２１と、その上に連結された垂直な気液接触筒２２と、貯水槽２１の側壁に取付けられた自吸式散気装置２３と、貯水槽２１内の被処理水をポンプにより槽底部から汲み上げて気液接触筒２２の最上部内へ戻す循環系２４とを有している。 The vertical treatment apparatus 20 includes a water storage tank 21 for storing water to be treated, a vertical gas-liquid contact cylinder 22 connected thereto, and a self-priming diffuser 23 attached to the side wall of the water storage tank 21. And a circulation system 24 that pumps water to be treated in the water storage tank 21 from the bottom of the tank by a pump and returns it to the uppermost part of the gas-liquid contact cylinder 22.
処理装置２０の気液接触筒２２内には、ブロー水と燃焼排ガスの接触面積、接触時間を増大させるために、ラッシヒリング材などからなる静止型の接触促進部材が充填されている。自吸式散気装置２３は、水平軸により支持された槽内の回転羽根と槽外の羽根駆動モータとからなり、槽内の被処理水中で回転羽根が回転駆動されることによりガスを吸引して槽内の被処理水中に拡散注入する。 The gas-liquid contact cylinder 22 of the processing apparatus 20 is filled with a stationary contact promoting member made of a Raschig ring material or the like in order to increase the contact area and contact time of blow water and combustion exhaust gas. The self-priming diffuser 23 is composed of a rotating blade in a tank supported by a horizontal axis and a blade driving motor outside the tank, and sucks gas by rotating the rotating blade in the water to be treated in the tank. Then, it is diffused and injected into the water to be treated in the tank.
貯水槽２１内の自吸式散水装置２３に対向する側は、処理水の取り出し側である。貯水槽２１の取り出し側には、その側の側壁に沿って仕切り壁２５が設けられている。仕切り壁２５は、貯水槽２１の槽底から若干離れた位置に支持されおり、取り出し側の側壁との間に処理水滞留部２６を形成し、その反対側（散水装置側）の側壁との間に気液接触部２７を形成している。処理水滞留部２６には、処理水のｐＨを測定するためにｐＨ計２８が設置されている。 The side facing the self-priming water sprinkler 23 in the water storage tank 21 is the treated water take-out side. On the take-out side of the water storage tank 21, a partition wall 25 is provided along the side wall on that side. The partition wall 25 is supported at a position slightly away from the tank bottom of the water storage tank 21, forms a treated water retaining portion 26 between the partition wall 25 and the side wall on the opposite side (watering device side). A gas-liquid contact portion 27 is formed therebetween. The treated water retention unit 26 is provided with a pH meter 28 for measuring the treated water pH.
処理装置２０には、ボイラー１０からブロー水及び燃焼排ガスが導入される。ボイラー１０から排出された高アルカリのブロー水は、原水槽１１に冷却水と共に導入される。原水槽１１内のブロー水は、ｐＨが例えば１１．０〜１１．８であり、ポンプをもつ原水導入系１２により、処理装置２０の気液接触筒２２内に最上部から導入される。原水導入系１２には流量制御弁１３が設けられている。流量制御弁１３は、前記ｐＨ計２８にて測定された処理水のｐＨが目標範囲内に管理されるように、図示されない制御部により開閉制御される。 Blow water and combustion exhaust gas are introduced into the processing apparatus 20 from the boiler 10. The highly alkaline blow water discharged from the boiler 10 is introduced into the raw water tank 11 together with the cooling water. The blow water in the raw water tank 11 has a pH of, for example, 11.0 to 11.8, and is introduced from the top into the gas-liquid contact tube 22 of the processing apparatus 20 by the raw water introduction system 12 having a pump. The raw water introduction system 12 is provided with a flow control valve 13. The flow rate control valve 13 is controlled to be opened and closed by a control unit (not shown) so that the pH of the treated water measured by the pH meter 28 is managed within a target range.
一方、ボイラー１０から排出される燃焼排ガスは、処理装置２０の貯水槽２１に設けられた自吸式散気装置２３の作動に伴い、排ガス供給系１４を経由して当該散気装置２３に吸引され、当該散気装置２３から貯水槽２１の処理水滞留部２６内のブロー水中に細かな気泡として注入される。排ガス供給系１４には、バックアップ用のＣＯ2 ガスボンベ１５が接続されている。 On the other hand, the combustion exhaust gas discharged from the boiler 10 is sucked into the air diffuser 23 via the exhaust gas supply system 14 in accordance with the operation of the self-priming air diffuser 23 provided in the water storage tank 21 of the processing device 20. Then, it is injected as fine bubbles from the diffuser 23 into the blow water in the treated water retention part 26 of the water storage tank 21. A backup CO 2 gas cylinder 15 is connected to the exhaust gas supply system 14.
次に、本実施形態のアルカリ排水中和装置の機能について説明する。 Next, the function of the alkaline wastewater neutralization apparatus of this embodiment will be described.
本実施形態のアルカリ排水中和装置の稼働中は、原水導入系１２内のポンプ、循環系２４内のポンプ、及び自吸式散水装置２３のモータが作動する。原水導入系１２内のポンプが作動することにより、原水槽１１内の高アルカリのブロー水が、原水導入系１２を経由して処理装置２０の気液接触筒２２内に最上部から導入される。気液接触筒２２内に導入されたブロー水は、気液接触筒２２内の接触促進部材を経て貯水槽２１内の気液接触部２７に流入し、ここに滞留する。 During operation of the alkaline wastewater neutralization device of the present embodiment, the pump in the raw water introduction system 12, the pump in the circulation system 24, and the motor of the self-priming watering device 23 are operated. By operating the pump in the raw water introduction system 12, the highly alkaline blow water in the raw water tank 11 is introduced from the top into the gas-liquid contact cylinder 22 of the processing apparatus 20 via the raw water introduction system 12. . The blow water introduced into the gas-liquid contact tube 22 flows into the gas-liquid contact part 27 in the water storage tank 21 through the contact promoting member in the gas-liquid contact tube 22 and stays there.
また、循環系２４内のポンプが作動することにより、貯水槽２１内の気液接触部２７に滞留するブロー水が、循環系２４を経由して気液接触筒２２の最上部内に再導入される。再導入されたブロー水は、気液接触筒２２内を経て貯水槽２１内の気液接触部２７に流入する。すなわち、原水槽１１内のブロー水は、処理装置２０に導入されつつ、処理装置２０を循環する。 Further, when the pump in the circulation system 24 is operated, blow water staying in the gas-liquid contact portion 27 in the water storage tank 21 is reintroduced into the uppermost portion of the gas-liquid contact cylinder 22 via the circulation system 24. The The re-introduced blow water flows into the gas-liquid contact part 27 in the water storage tank 21 through the gas-liquid contact cylinder 22. That is, the blow water in the raw water tank 11 is circulated through the processing device 20 while being introduced into the processing device 20.
そして、自吸式散気装置２３の駆動モータが作動することにより、ボイラー１０から燃焼排ガスの一部が排ガス供給系１４を経て自吸式散気装置２３に吸引され、貯水槽２１内の気液接触部２７に存在するブロー水中に拡散して注入される。これにより、貯水槽２１内の気液接触部２７に存在するブロー水を中和処理する。貯水槽２１内の気液接触部２７にあるブロー水中に注入された燃焼排ガスは、気液接触部２７から気液接触筒２２内に下方より流入し、気液接触筒２２内を上昇して、その最上部から筒外へ排出される。燃焼排ガスが気液接触筒２２内を上昇する過程で、その燃焼排ガスは気液接触筒２２内を流下するブロー水と向流接触し、そのブロー水を中和処理する。 Then, when the drive motor of the self-priming diffuser 23 is operated, a part of the combustion exhaust gas is sucked from the boiler 10 through the exhaust gas supply system 14 into the self-priming diffuser 23 and the air in the water storage tank 21 is exhausted. It is diffused and injected into the blow water present in the liquid contact portion 27. Thereby, the blow water which exists in the gas-liquid contact part 27 in the water storage tank 21 is neutralized. The combustion exhaust gas injected into the blown water in the gas-liquid contact portion 27 in the water storage tank 21 flows from the gas-liquid contact portion 27 into the gas-liquid contact tube 22 from below and rises in the gas-liquid contact tube 22. , It is discharged from the top of the cylinder. In the process in which the combustion exhaust gas rises in the gas-liquid contact cylinder 22, the combustion exhaust gas comes into countercurrent contact with the blow water flowing down in the gas-liquid contact cylinder 22, and neutralizes the blow water.
すなわち、ボイラー１０から原水槽１１を経て処理装置２０に導入されたブロー水は、気液接触筒２２から貯水槽２１の気液接触部２７に至る過程で、燃焼排ガスにより２段階の中和処理を受ける。しかも、気液接触部２７に存在するブロー水の一部が循環系２４を経て気液接触筒２２及び貯水槽２１の気液接触部２７に循環し、２段階の中和処理を繰り返し受ける。そして、処理装置２０へのブロー水の新たな供給に伴って、気液接触部２７に存在するブロー水の一部が、貯水槽２１の処理水滞留部２６を経て槽外へ処理水として流出する。 That is, the blow water introduced from the boiler 10 through the raw water tank 11 into the treatment device 20 is neutralized in two stages by the combustion exhaust gas in the process from the gas-liquid contact tube 22 to the gas-liquid contact portion 27 of the water storage tank 21. Receive. In addition, a part of the blow water present in the gas-liquid contact part 27 is circulated through the circulation system 24 to the gas-liquid contact cylinder 22 and the gas-liquid contact part 27 of the water storage tank 21 and repeatedly undergoes a two-step neutralization process. Along with the new supply of blow water to the treatment device 20, a part of the blow water present in the gas-liquid contact portion 27 flows out as treated water to the outside of the tank through the treated water retention portion 26 of the water storage tank 21. To do.
かくして、本実施形態のアルカリ排水中和装置においては、ボイラー１０から排出されるｐＨ１１以上の高アルカリのブロー水が、ＣＯ2 濃度が３容量％程度の低濃度であっても、単一の処理装置２０においてｐＨ８未満まで高い効率で中和処理される。 Thus, the alkaline waste water neutralizer of the present embodiment, blow water pH11 more highly alkaline discharged from the boiler 10, CO 2 concentration even at low concentration of about 3 volume%, a single processing In the apparatus 20, neutralization is performed with high efficiency up to a pH of less than 8.
本実施形態のアルカリ排水中和装置においては又、貯水槽２１の処理水滞留部２６に存在するブロー水のｐＨがｐＨ計２８により測定される。ブロー水のｐＨ測定値が目標範囲より高い場合、すなわちアルカリ度が目標範囲より高く、中和処理が不足している場合は、原水導入系１２に設けられた流量制御弁１３の開度が小さくなる。これにより、処理装置２０へのブロー水の導入量が減少し、その分、処理装置２０からの処理水の流出量が減少するので、ブロー水の処理装置２０への循環量が相対的に増大し、中和処理の程度が増すことにより、アルカリ度が低下する。 In the alkaline wastewater neutralization apparatus of the present embodiment, the pH of the blow water present in the treated water retention portion 26 of the water storage tank 21 is measured by the pH meter 28. When the measured pH value of the blow water is higher than the target range, that is, when the alkalinity is higher than the target range and the neutralization treatment is insufficient, the opening degree of the flow control valve 13 provided in the raw water introduction system 12 is small. Become. As a result, the amount of blow water introduced into the treatment device 20 is reduced, and the amount of treated water flowing out of the treatment device 20 is reduced accordingly, so that the circulation amount of the blow water to the treatment device 20 is relatively increased. However, as the degree of neutralization increases, the alkalinity decreases.
反対に、ブロー水のｐＨ測定値が目標範囲より低い場合、すなわちアルカリ度が目標範囲より低く、中和処理が過剰の場合は、原水導入系１２に設けられた流量制御弁１３の開度が大きくなる。これにより、処理装置２０へのブロー水の導入量が増加し、その分、処理装置２０からの処理水の流出量が増加するので、ブロー水の処理装置２０への循環量が相対的に減少し、中和処理の程度が減ることにより、アルカリ度が上昇する。 On the contrary, when the measured pH value of the blow water is lower than the target range, that is, when the alkalinity is lower than the target range and the neutralization process is excessive, the opening degree of the flow control valve 13 provided in the raw water introduction system 12 is increased. growing. As a result, the amount of blow water introduced into the treatment device 20 is increased, and the amount of treated water flowing out of the treatment device 20 is increased accordingly, so that the circulation amount of the blow water to the treatment device 20 is relatively reduced. However, the alkalinity increases as the degree of neutralization treatment decreases.
これにより、処理水のｐＨが目標範囲内に管理されつつ、最大限の処理量が確保される。原水であるブロー水の処理要求量に対して燃焼排ガス量が不足する場合は、バックアップ用のＣＯ2 ガスボンベ１５から排ガス供給系１４へＣＯ2 ガスが補充される。 Thereby, the maximum treatment amount is ensured while the pH of the treated water is managed within the target range. When the amount of combustion exhaust gas is insufficient with respect to the required processing amount of blow water, which is raw water, CO 2 gas is replenished from the backup CO 2 gas cylinder 15 to the exhaust gas supply system 14.
特許文献２に記載された２段タンデム式のアルカリ排水中和装置と、本実施形態のアルカリ排水中和装置とを、原水ｐＨ及び処理水ｐＨが同一、処理量が同一で比較した場合、必要排ガス量は概ね、前者が後者の２倍を必要とする。これに伴って、排ガス吸引動力も概ね、前者が後者の２倍を必要とする。設備コストは概ね、前者が後者の１．５倍となる。 Necessary when comparing the two-stage tandem type alkaline wastewater neutralizer described in Patent Document 2 and the alkaline wastewater neutralizer of this embodiment with the same raw water pH and treated water pH and the same treatment amount. The amount of exhaust gas generally requires twice as much as the latter. Along with this, the exhaust gas suction power generally requires twice as much as the latter. The facility cost is roughly 1.5 times higher for the former than for the latter.
ここにおける原水のｐＨは１１．８、水温は４０℃、電気伝導度は３５０ｍＳ／ｍであり、処理水のｐＨは７．５、処理量は１．０ｍ3 ／Ｈｒである。また、排ガスのＣＯ2 濃度は４．０％であり、必要排ガス量は、特許文献２に記載された２段タンデム式のアルカリ排水中和装置の場合は３０ｍ3 ／Ｈｒであるのに対し、本実施形態のアルカリ排水中和装置は半分の１５ｍ3 ／Ｈｒとなる。 Here, the pH of the raw water is 11.8, the water temperature is 40 ° C., the electric conductivity is 350 mS / m, the pH of the treated water is 7.5, and the treatment amount is 1.0 m 3 / Hr. Further, the CO 2 concentration of the exhaust gas is 4.0%, and the required exhaust gas amount is 30 m 3 / Hr in the case of the two-stage tandem alkaline waste water neutralizer described in Patent Document 2, whereas The alkaline wastewater neutralization apparatus of the present embodiment is half of 15 m 3 / Hr.
１０ ボイラー
１１ 原水タンク
１２ 原水導入系
１３ 流量制御弁
１４ 排ガス供給系
１５ ＣＯ2 ガスボンベ
２０ 処理装置
２１ 貯水槽
２２ 気液接触筒
２３ 自吸式散気装置
２４ 循環系
２５ 仕切り壁
２６ 原水滞留部
２７ 気液接触部
２８ ｐＨ計
10 Boiler 11 raw water tank 12 the raw water inlet system 13 the flow control valve 14 gas supply system 15 CO 2 gas cylinder 20 processor 21 water tank 22 gas-liquid contact cylinder 23 self-priming air diffuser 24 circulation 25 partition wall 26 raw water retention portion 27 Gas-liquid contact part 28 pH meter
Claims (4)
処理装置の貯水槽に付設され、ＣＯ2 含有ガスを中和剤として貯水槽内の被処理水に注入する散気装置とを具備しており、
貯水槽内の被処理水に散気装置により注入されたＣＯ2 含有ガスが気液接触筒の上部から筒外へ排出され、貯水槽から槽外へ処理水が導出されるアルカリ排水中和装置。 A gas-liquid contact cylinder into which alkaline drainage to be neutralized is introduced from above, a treatment device connected continuously above the water tank,
An aeration device attached to the water tank of the treatment device and injecting the CO 2 -containing gas into the water to be treated in the water tank as a neutralizing agent,
Alkaline drainage neutralization device in which CO 2 -containing gas injected into the water to be treated in the water storage tank is discharged from the upper part of the gas-liquid contact cylinder to the outside of the cylinder, and the treated water is led out of the tank from the water tank .
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| JP2020131117A (en) * | 2019-02-20 | 2020-08-31 | 株式会社Ihi | Neutralizing apparatus |
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|---|---|---|---|---|
| JPS551814B1 (en) * | 1969-12-02 | 1980-01-17 | ||
| JP2003225681A (en) * | 2002-02-07 | 2003-08-12 | Miura Co Ltd | Neutralization device for boiler drainage |
| JP2004202386A (en) * | 2002-12-25 | 2004-07-22 | Kurita Water Ind Ltd | Apparatus for neutralizing boiler blow water |
| JP2006192386A (en) * | 2005-01-14 | 2006-07-27 | Miura Co Ltd | Neutralization device |
| JP2006263641A (en) * | 2005-03-25 | 2006-10-05 | Toyobo Engineering Kk | Gas dissolution method and its apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551814B1 (en) * | 1969-12-02 | 1980-01-17 | ||
| JP2003225681A (en) * | 2002-02-07 | 2003-08-12 | Miura Co Ltd | Neutralization device for boiler drainage |
| JP2004202386A (en) * | 2002-12-25 | 2004-07-22 | Kurita Water Ind Ltd | Apparatus for neutralizing boiler blow water |
| JP2006192386A (en) * | 2005-01-14 | 2006-07-27 | Miura Co Ltd | Neutralization device |
| JP2006263641A (en) * | 2005-03-25 | 2006-10-05 | Toyobo Engineering Kk | Gas dissolution method and its apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020131117A (en) * | 2019-02-20 | 2020-08-31 | 株式会社Ihi | Neutralizing apparatus |
| JP7230574B2 (en) | 2019-02-20 | 2023-03-01 | 株式会社Ihi | Neutralization device |
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