JP5326377B2

JP5326377B2 - Nitrogen displacement deoxygenator

Info

Publication number: JP5326377B2
Application number: JP2008163920A
Authority: JP
Inventors: 哲雄古賀; 靖田渕
Original assignee: Kurita Water Industries Ltd
Current assignee: Kurita Water Industries Ltd
Priority date: 2008-06-24
Filing date: 2008-06-24
Publication date: 2013-10-30
Anticipated expiration: 2028-06-24
Also published as: JP2010005484A

Description

この発明は、水中の溶存酸素を窒素ガスを用いて除去する窒素置換式脱酸素装置に関するものである。 The present invention relates to a nitrogen substitution type deoxygenation apparatus that removes dissolved oxygen in water using nitrogen gas.

例えば、ボイラ給水中に含まれる溶存酸素は、ボイラ並びに附帯装置、蒸気配管、蒸気使用機器、ドレン（凝縮水）回収配管等を腐食し、装置に故障を生じさせたり、重大な事故を生じさせる。このため、ボイラ給水は、例えば、窒素置換式脱酸素装置を用いて、水中の溶存酸素が除去される。 For example, dissolved oxygen contained in boiler feedwater corrodes the boiler, ancillary equipment, steam piping, steam-using equipment, drain (condensate) recovery piping, etc., causing equipment failure or serious accidents. . For this reason, as for boiler feed water, the dissolved oxygen in water is removed, for example using a nitrogen substitution type deoxygenation apparatus.

この窒素置換式脱酸素装置は、上方側から供給されて下方に向かう被処理水と下方側から供給されて上方に向かう窒素ガスとを接触させて、下部から溶存酸素が除去された脱酸素水が取り出され、上部から酸素を含む窒素ガスが排出される対向式の脱酸素塔を用いたものである。 This nitrogen substitution type deoxygenation device is a deoxygenated water in which dissolved water is removed from the lower part by contacting the water to be treated which is supplied from the upper side and directed downward and the nitrogen gas which is supplied from the lower side and directed upward. Is used, and a counter-type deoxygenation tower in which nitrogen gas containing oxygen is discharged from the top is used.

一方、窒素置換式脱酸素装置には、脱酸素水を貯める貯水タンクが必要であり、かつ、この貯水タンクを含む系内に、外気（空気）が侵入しないような処置をする必要があり、付属機器にコストがかかってしまうという欠点等があった。そこで、本出願人は、特許文献１に記載されているように、脱酸素塔をボイラの給水タンクと一体となるように設けて、脱酸素水の貯水タンクを無くした窒素置換式脱酸素装置（脱酸素水の供給システム）を提案している。 On the other hand, the nitrogen substitution type deoxygenation apparatus requires a water storage tank for storing deoxygenated water, and it is necessary to take measures to prevent outside air (air) from entering the system including the water storage tank. There was a drawback that the attached equipment was costly. Therefore, as described in Patent Document 1, the present applicant has provided a deoxygenation tower so as to be integrated with a water supply tank of a boiler, and eliminates the deoxygenated water storage tank, thereby removing nitrogen. (Deoxygenated water supply system) is proposed.

特願２００７−０７９２６５Japanese Patent Application No. 2007-079265

しかしながら、上記窒素置換式脱酸素装置では、脱酸素水を給水タンク側に供給する、脱酸素塔の下部を、給水タンクの水面から下方に深く没するように設けているが、この水没部分から、脱酸素塔の運転時に生じる、微小な酸素ガス気泡や、微小な酸素を含む窒素ガス気泡が給水タンク内に流出して、給水タンク内で酸素の再溶解が生じたり、この水没部分中で、酸素の水中への再溶解が生じたりしやすいという課題があった。このため、この窒素置換式脱酸素装置では、設計上の脱酸素率が得られにくいという課題があった。 However, in the above nitrogen substitution type deoxygenation device, the lower part of the deoxygenation tower that supplies deoxygenated water to the water supply tank side is provided so as to be deeply submerged downward from the water surface of the water supply tank. , Oxygen gas bubbles generated during the operation of the deoxygenation tower and nitrogen gas bubbles containing minute oxygen flow into the water supply tank, causing re-dissolution of oxygen in the water supply tank, There is a problem that oxygen is easily re-dissolved in water. For this reason, this nitrogen substitution type deoxygenation apparatus has a problem that it is difficult to obtain a designed deoxygenation rate.

また、以上の課題は、脱酸素塔下方に、通常の貯水タンクを有し、この脱酸素塔の下部の脱酸素水の供給部分を貯水タンクの水面下に水没させている窒素置換式脱酸素装置においても同様に生じる。さらに、上記課題は、貯水タンクの側方に脱酸素塔を配置し、脱酸素塔の下部の脱酸素水供給端部を、貯水タンクの水面より下方の側面側又は貯水タンクの底面側に接続した窒素置換式脱酸素装置においても同様に生じる。 In addition, the above problem is that a nitrogen-replacement-type deoxygenation system has a normal water storage tank below the deoxygenation tower, and the deoxygenated water supply portion at the bottom of the deoxygenation tower is submerged under the water surface of the water storage tank. The same occurs in the apparatus. Furthermore, the above-mentioned problem is that a deoxygenation tower is disposed on the side of the water storage tank, and the deoxygenation water supply end at the bottom of the deoxygenation tower is connected to the side surface below the water surface of the water storage tank or the bottom surface side of the water storage tank. This also occurs in the nitrogen substitution type deoxygenation apparatus.

この発明は、以上の点に鑑み、酸素の再溶解を防止して、脱酸素率の向上を図ることができる窒素置換式脱酸素装置を提供することを目的とする。 An object of this invention is to provide the nitrogen substitution type | mold deoxygenation apparatus which can aim at the improvement of a deoxidation rate by preventing remelting of oxygen in view of the above point.

この発明の請求項１記載の発明は、上方側から供給されて下方に向かう被処理水と、下方側から供給されて上方に向かう窒素ガスとを接触させて、下部から溶存酸素が除去された脱酸素水が取り出され、上部から酸素を含んだ窒素ガスが排出される脱酸素塔と、前記脱酸素塔からの前記脱酸素水を貯める貯水タンクとを有した窒素置換式脱酸素装置であって、前記脱酸素塔の下部の、前記貯水タンク側に向いた唯一の開口である前記脱酸素水の供給端側を、この貯水タンクの上面壁を貫通させて、その水面下に水没させた状態で、前記脱酸素塔を前記貯水タンクに取り付け、かつ、前記脱酸素水が下向きに流れる、前記脱酸素塔の下部の、前記貯水タンクに連通して形成される水面より下方に、前記窒素ガスを多数の小泡にして前記脱酸素塔内に供給する窒素ガス供給部を設けていることを特徴とする。 According to the first aspect of the present invention, the water to be treated that is supplied from the upper side and directed downward is brought into contact with the nitrogen gas that is supplied from the lower side and directed upward, so that dissolved oxygen is removed from the lower part. A nitrogen substitution type deoxygenation apparatus having a deoxygenation tower from which deoxygenated water is taken out and nitrogen gas containing oxygen is discharged from the upper part, and a water storage tank for storing the deoxygenated water from the deoxygenation tower. The deoxygenated water supply end side, which is the only opening facing the water storage tank side at the lower part of the deoxygenation tower, penetrates the upper surface wall of the water storage tank and is submerged under the water surface . In the state, the deoxygenation tower is attached to the water storage tank , and the deoxygenation water flows downward, below the water surface formed in communication with the water storage tank below the deoxygenation tower, the nitrogen The deoxygenation tower is made by making the gas into many small bubbles Characterized in that it provided a nitrogen gas supply unit for supplying a.

この発明では、脱酸素塔で脱酸素処理して作った脱酸素水は、脱酸素塔下部の供給端側から貯水タンク内に供給される。この場合、この供給端側が貯水タンクの水面より下方に位置するため、脱酸素塔下部には、貯水タンクとの連通作用によって、貯水タンクの水面に対応するように脱酸素水の水面が形成される。この脱酸素塔下部の水面下では、この水面に落下した脱酸素水と、落下に当たり巻き込まれたり又は被処理水に含まれていたガス泡（酸素を含む窒素ガス泡、酸素ガス泡、窒素ガス泡）とが混合した状態になっている。この状態で、窒素ガス供給部から、脱酸素塔下部の水面下の脱酸素水中に窒素ガスが供給されると、この窒素ガスは、脱酸素水中を多数の小さな泡となって上昇するが、この窒素ガスの小泡が、脱酸素水中に混在するガス泡と衝突して、このガス泡を取り込みつつ上昇するため、小さなガス泡が、脱酸素水中に留まったり、貯水タンク内に流入するのが防止される。 In this invention, deoxygenated water produced by deoxygenation treatment in a deoxygenation tower is supplied into the water storage tank from the supply end side at the lower part of the deoxygenation tower. In this case, since the supply end side is located below the water surface of the water storage tank, the water surface of the deoxygenated water is formed in the lower part of the deoxygenation tower so as to correspond to the water surface of the water storage tank by the communication action with the water storage tank. Is done. Under the surface of the water at the bottom of the deoxygenation tower, deoxygenated water dropped on the water surface and gas bubbles (nitrogen gas bubbles containing oxygen, oxygen gas bubbles, nitrogen gas) that were involved in the fall or contained in the water to be treated. Bubbles) are mixed. In this state, when nitrogen gas is supplied from the nitrogen gas supply unit into deoxygenated water below the surface of the deoxygenation tower, this nitrogen gas rises in the deoxygenated water as many small bubbles. The small bubbles of nitrogen gas collide with the gas bubbles mixed in the deoxygenated water and rise while taking in the gas bubbles, so that the small gas bubbles remain in the deoxygenated water or flow into the water storage tank. Is prevented.

すなわち、脱酸素塔下部の水面下の脱酸素水中のガス泡は、サイズが大きければ、速やかに上昇して脱酸素塔上部に移動するが、サイズが小さくなればなるほど上昇速度は低下する。一方、脱酸素塔下部の水面下の脱酸素水は、貯水タンク側に移動すべく、一定の速度で下降しているので、脱酸素水中のガス泡のうち、サイズの小さいものは、充分に上昇せず、脱酸素塔下部の脱酸素水中に留まったり、脱酸素水と共に貯水タンク側に移動して、脱酸素水中への酸素の再溶解を生じさせる。そこで、窒素ガス供給部によって、脱酸素塔下部の水面下の脱酸素水中で、上昇する多数の窒素ガス小泡を発生させ、この窒素ガス小泡とサイズの小さいガス泡とを衝突させて、窒素ガス小泡中にガス泡を取り込むことにより、サイズの小さいガス泡を脱酸素水から速やかに分離するようにして、ガス泡の脱酸素水中における停滞や貯水タンク側への移動を防止している。 That is, the gas bubbles in the deoxygenated water below the water surface at the lower part of the deoxygenation tower rise quickly and move to the upper part of the deoxygenation tower if the size is large, but the rising speed decreases as the size becomes smaller. On the other hand, the deoxygenated water below the surface of the deoxygenating tower is descending at a constant speed so as to move to the water storage tank side. It does not rise and stays in the deoxygenated water at the bottom of the deoxygenating tower, or moves to the storage tank side together with the deoxygenated water to cause re-dissolution of oxygen in the deoxygenated water. Therefore, the nitrogen gas supply unit generates a large number of ascending nitrogen gas bubbles in the deoxygenated water below the surface of the deoxygenation tower, and causes the nitrogen gas bubbles to collide with small gas bubbles, By incorporating the gas bubbles into the nitrogen gas bubbles, the small gas bubbles are quickly separated from the deoxygenated water to prevent stagnation of the gas bubbles in the deoxygenated water and movement to the water storage tank side. Yes.

この発明の請求項２記載の発明は、請求項１記載の発明の場合において、前記貯水タンクが、ボイラ側の要求に応じて、必要な量の脱酸素水をボイラ側に供給するための給水タンクであることを特徴とする。 The invention of claim 2, wherein the present invention is, in the case of the invention of claim 1, wherein the water storage tank, depending on the boiler side requests, the water supply for supplying deoxygenated water in an amount necessary to the boiler side It is a tank .

この発明では、窒素置換式脱酸素装置がボイラ給水用の脱酸素水を作る場合に、ボイラ側で必要とされるボイラの給水タンクと脱酸素塔とを一体に形成して、給水タンクに、脱酸素水用の貯水タンクの機能を持たせている。 In this invention, when the nitrogen substitution type deoxygenation device makes deoxygenated water for boiler feed water, the boiler water tank and deoxygenation tower required on the boiler side are integrally formed, It has the function of a storage tank for deoxygenated water.

この発明の請求項３記載の発明は、上方側から供給されて下方に向かう被処理水と、下方側から供給されて上方に向かう窒素ガスとを接触させて、下部から溶存酸素が除去された脱酸素水が取り出され、上部から酸素を含んだ窒素ガスが排出される脱酸素塔と、この脱酸素塔からの前記脱酸素水を貯める貯水タンクとを有した窒素置換式脱酸素装置であって、前記脱酸素塔を前記貯水タンクの側方に配置して、この脱酸素塔の下部の脱酸素水供給端部を、前記貯水タンクの水面より下方の側面側又は前記貯水タンクの底面側に接続しており、かつ、前記脱酸素水が下向きに流れる、前記脱酸素塔の下部の、前記貯水タンクに連通して形成される水面より下方に、前記窒素ガスを多数の小泡にして前記脱酸素塔内に供給する窒素ガス供給部を設けていることを特徴とする。 In the invention according to claim 3 of the present invention, the water to be treated supplied from the upper side and directed downward is brought into contact with the nitrogen gas supplied from the lower side and directed upward, so that the dissolved oxygen is removed from the lower part. A nitrogen-substituting deoxygenation apparatus having a deoxygenation tower from which deoxygenated water is taken out and nitrogen gas containing oxygen is discharged from the upper part, and a storage tank for storing the deoxygenated water from the deoxygenation tower. The deoxygenation tower is arranged on the side of the water storage tank, and the deoxygenation water supply end at the lower part of the deoxygenation tower is arranged on the side surface below the water surface of the water storage tank or the bottom surface side of the water storage tank. The nitrogen gas is made into a number of small bubbles below the water surface formed in communication with the water storage tank at the bottom of the deoxygenation tower, wherein the deoxygenated water flows downward. A nitrogen gas supply unit for supplying the deoxygenation tower is provided. And wherein the are.

この発明でも、脱酸素塔の下部の脱酸素水の供給端部が貯水タンクの水面より下方に位置するため、脱酸素塔の下部には、貯水タンクとの連通作用によって、貯水タンクの水面に対応するように脱酸素水の水面が形成される。したがって、この脱酸素塔の下部の水面下でも、脱酸素水とガス泡（酸素を含む窒素ガス泡、酸素ガス泡、窒素ガス泡）とが混合した状態になるが、このガス泡は、窒素ガス供給部によって供給された多数の窒素ガス小泡に取り込まれて、脱酸素水と容易に分離される。 In this invention, the feed end of deoxygenated water at the bottom of the deoxidation column is positioned below the water surface of the water storage tank, the bottom of the oxygen column, by communicating the action of the water tank, the water surface of the water storage tank The surface of deoxygenated water is formed correspondingly. Therefore, deoxygenated water and gas bubbles (oxygen-containing nitrogen gas bubbles, oxygen gas bubbles, nitrogen gas bubbles) are mixed even under the water surface at the bottom of the deoxygenation tower. It is taken in by a large number of nitrogen gas bubbles supplied by the gas supply unit and easily separated from deoxygenated water.

この発明の請求項１及び３記載の発明によれば、脱酸素塔の下部の脱酸素水の水面下に生じる、酸素等を含むガス泡を、脱酸素塔への窒素ガスの供給時に生じさせた窒素ガスの多数の小泡に衝突させて、この小泡内に取り込むようにしているので、酸素等を含む小さなガス泡が、脱酸素塔下部に漂ったり、貯水タンク側に移動することはなく、このようなガス泡を、脱酸素水から直ちに分離することができる。このため、この発明では、酸素を含む小さなガス泡に起因する、酸素の脱酸素水への再溶解を防止することができ、装置の脱酸素率の向上を図ることができる。 According to the first and third aspects of the present invention, gas bubbles containing oxygen and the like that are generated below the surface of deoxygenated water at the bottom of the deoxygenation tower are generated when nitrogen gas is supplied to the deoxygenation tower. Nitrogen gas collides with a large number of small bubbles so that they are taken into the small bubbles, so that small gas bubbles containing oxygen, etc. drift to the bottom of the deoxygenation tower or move to the storage tank side. Instead, such gas bubbles can be immediately separated from the deoxygenated water. For this reason, in this invention, it is possible to prevent re-dissolution of oxygen in deoxygenated water caused by small gas bubbles containing oxygen, and to improve the deoxygenation rate of the apparatus.

この発明の請求項２記載の発明によれば、脱酸素塔からの脱酸素水を、直接、ボイラの給水タンクに供給できるので、ボイラの給水タンクを脱酸素塔の貯水タンクとして用いることができ、装置の簡単化、低コスト化等を図ることができる。 According to the invention described in claim 2 of the present invention, the deoxygenated water from the deoxygenating tower can be directly supplied to the boiler water tank, so that the boiler water tank can be used as the deoxygenating tower water tank. Thus, the apparatus can be simplified and the cost can be reduced.

以下、この発明の実施の形態を図面を参照しつつ説明する。
実施形態１．
図１はこの発明の一実施の形態に係る窒素置換式脱酸素装置を示している。 Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1. FIG.
FIG. 1 shows a nitrogen substitution type deoxygenation apparatus according to an embodiment of the present invention.

窒素置換式脱酸素装置１は、図１で示されるように、給水タンク１０と、水位検出器１１と、脱酸素塔１２と、循環ポンプ１３、逆止弁１４、定流量弁１５、及び循環配管１６からなる水処理ラインＲと、流量調節弁１７、電磁弁１８、及び補給水配管１９からなる補給ラインＳと、給水ポンプ２０、及び給水配管２１からなる給水ラインＴと、窒素ガス供給ラインＵとから構成されている。 As shown in FIG. 1, the nitrogen substitution type deoxygenation apparatus 1 includes a water supply tank 10, a water level detector 11, a deoxygenation tower 12, a circulation pump 13, a check valve 14, a constant flow valve 15, and a circulation. A water treatment line R composed of a pipe 16, a replenishment line S composed of a flow control valve 17, a solenoid valve 18, and a makeup water pipe 19, a water supply line T composed of a water supply pump 20 and a water supply pipe 21, and a nitrogen gas supply line U.

給水タンク１０は、ボイラ給水Ｗ３となる水を一定量貯め、ボイラ側の要求に応じて、必要な脱酸素水Ｗ２をボイラ給水Ｗ３として供給するためのものであり、例えば、ボイラの瞬間最大負荷、すなわち給水ポンプ２０の最大給水流量の３０分程度のボイラ給水Ｗ３をタンク水Ｗ１として貯えている。この給水タンク１０は、水平断面が矩形状をした箱状のパネル式タンクであり、側面下部に、給水ラインＴへの給水取り出し口となる給水ノズル１００と、水処理ラインＲへのタンク水Ｗ１の取り出し口となる循環水ノズル１０１とが設けられている。また、この給水タンク１０には、上面に、脱酸素塔１２に窒素ガスＮを供給する窒素ガスノズル１０２と、水位検出器１１の取付部１０３と、外気との連通部となるベント管１０４とが設けられている。なお、窒素ガスノズル１０２は、脱酸素塔１２と接続するために、給水タンク１０の内方まで延びている。 The water supply tank 10 is for storing a certain amount of water to be the boiler feed water W3 and for supplying the necessary deoxygenated water W2 as the boiler feed water W3 in response to the demand on the boiler side. For example, the instantaneous maximum load of the boiler That is, boiler feed water W3 having a maximum feed water flow rate of feed water pump 20 of about 30 minutes is stored as tank water W1. The water supply tank 10 is a box-shaped panel tank having a rectangular horizontal cross section, and a water supply nozzle 100 serving as a water supply outlet to the water supply line T and tank water W1 to the water treatment line R at the lower side. And a circulating water nozzle 101 serving as a take-out port. The water supply tank 10 has a nitrogen gas nozzle 102 for supplying nitrogen gas N to the deoxygenation tower 12, a mounting portion 103 for the water level detector 11, and a vent pipe 104 serving as a communication portion with outside air. Is provided. The nitrogen gas nozzle 102 extends to the inside of the water supply tank 10 in order to connect to the deoxygenation tower 12.

ここで、給水タンク１０には、タンク水Ｗ１の水位が低下してくると、上部の空間部Ｖの容積が増加するため、ベント管１０４を介して内部に外気が取り込まれるととも、タンク水Ｗ１の水位が上昇してくると、この空間部Ｖの容積が減少するため、内部の空気がベント管１０ｄを介して外部に排出される。 Here, in the water supply tank 10, when the water level of the tank water W <b> 1 decreases, the volume of the upper space V increases, so that outside air is taken in through the vent pipe 104 and the tank water When the water level of W1 rises, the volume of the space V decreases, so that the internal air is discharged to the outside through the vent pipe 10d.

水位検出器１１は、給水タンク１０内に貯えられているタンク水Ｗ１の水位（水面レベル）のうち、所定の高レベルＬ１と低レベルＬ２とを検知するものである。この水位検出器１１は、タンク水Ｗ１の水位が、低レベルＬ２に達した場合には、補給ラインＳの電磁弁１８に、これを開けさせるような信号を発し、給水タンク１０側へ補給水Ｗ０を供給させ、これが、高レベルＬ１に達した場合には、補給ラインＳの電磁弁１８にこれを閉じさせるような信号を発し、給水タンク１０側への補給水Ｗ０の供給を停止させる。なお、給水タンク１０の高レベルＬ１と低レベルＬ２間の水位変動幅ｈは、タンク容量の１／１０、すなわち、給水タンク１０の満水高さの１／１０程度となっている。 The water level detector 11 detects a predetermined high level L1 and low level L2 of the water level (water level) of the tank water W1 stored in the water supply tank 10. When the water level of the tank water W1 reaches the low level L2, the water level detector 11 issues a signal to open the solenoid valve 18 of the supply line S so that the supply water is supplied to the water supply tank 10 side. When W0 is supplied and reaches the high level L1, a signal is sent to the electromagnetic valve 18 of the replenishment line S to close it, and the supply of the replenishment water W0 to the water supply tank 10 side is stopped. The water level fluctuation width h between the high level L1 and the low level L2 of the water supply tank 10 is about 1/10 of the tank capacity, that is, about 1/10 of the full water height of the water supply tank 10.

脱酸素塔１２は、水中の溶存酸素を窒素ガスＮ側に取り出す溶存酸素の除去手段であり、かつ、溶存酸素を除去した脱酸素水Ｗ２を給水タンク１０に直接供給する脱酸素水供給手段である。この脱酸素塔１２では、上方側から供給されて重力落下で下方に向かう処理水と、下方側から供給されて上方に向かう窒素ガスＮとを対向するように接触させて、下部から溶存酸素が除去された脱酸素水Ｗ２が取り出され、上部から処理済み窒素ガス（酸素ガスを含んだ窒素ガス）が排出される。 The deoxygenation tower 12 is a means for removing dissolved oxygen that takes out dissolved oxygen in water to the nitrogen gas N side, and a deoxygenated water supply means that directly supplies the deoxygenated water W2 from which dissolved oxygen has been removed to the water supply tank 10. is there. In this deoxygenation tower 12, the treated water supplied from the upper side and directed downward by gravity drop is brought into contact with the nitrogen gas N supplied from the lower side and directed upward, so that dissolved oxygen is introduced from the lower part. The removed deoxygenated water W2 is taken out, and treated nitrogen gas (nitrogen gas containing oxygen gas) is discharged from the top.

この脱酸素塔１２の主要部は、上部の水供給部１２０から下方に、上側のリアクター部１２１と、整流部１２３と、下側のリアクター部１２２と、ガス分離部１２４とが設けられたものであり、この主要部は、全体として、例えばサイズ８０Ａ〜３００Ａの配管を用いて、同径で一直線状の細長い筒状に形成されている。また、この脱酸素塔１２は、水供給部１２０上に、脱酸素処理によって酸素ガスを含むようになった処理済窒素ガスを排出するガス排出部１２５を有すとともに、ガス分離部１２４内に、脱酸素塔１２内に窒素ガスＮを供給する窒素ガス供給部としての散気管１２６を有している。なお、上側のリアクター部１２１と整流部１２３とは、１組だけでなく、被処理水の状況によって、上下方向に複数組のものが設けられていてもよい。 The main part of the deoxygenation tower 12 is provided with an upper reactor unit 121, a rectifying unit 123, a lower reactor unit 122, and a gas separation unit 124 below the upper water supply unit 120. As a whole, this main part is formed in a straight and elongated cylindrical shape with the same diameter using, for example, piping of sizes 80A to 300A. In addition, the deoxygenation tower 12 has a gas discharge unit 125 that discharges the treated nitrogen gas that contains oxygen gas by the deoxygenation process on the water supply unit 120, and in the gas separation unit 124. The deoxygenation tower 12 has an air diffuser 126 serving as a nitrogen gas supply unit for supplying nitrogen gas N. The upper reactor unit 121 and the rectifying unit 123 are not limited to one set, and a plurality of sets may be provided in the vertical direction depending on the state of the water to be treated .

この脱酸素塔１２は、給水タンク１０の上面側から、これを立てた状態で差し込むようにして、この給水タンク１０の上面に、この給水タンク１０と一体となるように取り付けられる。この場合、下側のリアクター部１２２は、給水タンク１０の上方に配置されるが、下部のガス分離部１２４の大部分は給水タンク１０内に配置され、このガス分離部１２４の多くの部分が給水タンク１０の水面Ｍ１下に水没するように位置決めされる。 The deoxygenation tower 12 is attached to the upper surface of the water supply tank 10 so as to be integrated with the water supply tank 10 so as to be inserted from the upper surface side of the water supply tank 10 in an upright state. In this case, the lower reactor unit 122 is disposed above the water supply tank 10, but most of the lower gas separation unit 124 is disposed in the water supply tank 10, and many parts of the gas separation unit 124 are formed. The water tank 10 is positioned so as to be submerged under the water surface M1.

水供給部１２０は、側面に脱酸素処理する被処理水の取入ノズル１２０ａが設けられているとともに、球面状の上端部にガス排出部１２５が取り付けられている。このガス排出部１２５は、大気解放されたパイプ１２５ａに逆止弁１２５ｂを設けたものである。 The water supply unit 120 is provided with an intake nozzle 120a for water to be deoxygenated on a side surface, and a gas discharge unit 125 is attached to a spherical upper end. This gas discharge part 125 is provided with a check valve 125b in a pipe 125a released to the atmosphere.

リアクター部１２１，２２は、被処理水と窒素ガスＮとを対向接触させて、ヘンリーの法則によって、被処理水中の溶存酸素を除去する働きを有している。整流部１２３は、上側のリアクター部１２１から重力落下してきた被処理水を一旦貯めて、この被処理水を、下側のリアクター部１２２に定流量で送る働きを有している。 Reactor unit 121,22 has a water to be treated and the nitrogen gas N is opposed contact, by Henry's Law, and has a function of removing dissolved oxygen in the treated in water. The rectifying unit 123 has a function of temporarily storing the water to be treated which has been dropped by gravity from the upper reactor unit 121 and sending the water to be treated to the lower reactor unit 122 at a constant flow rate.

ガス分離部１２４は、脱酸素された被処理水と、酸素ガスや窒素ガスとを最終的に分離して、脱酸素水Ｗ２を取り出し、この脱酸素水Ｗ２を給水タンク１０に供給する部分である。ガス分離部１２４は、下端の供給口１２４ａが、給水タンク１０内のタンク水Ｗ１の下部側まで延び、内部に、給水タンク１０との連通によって、給水タンク１０の水面Ｍ１とほぼ同一レベルの脱酸素水Ｗ２の水面Ｍ２が形成される。そして、このガス分離部１２４内では、図２で示されるように、この水面Ｍ２より下方において、脱酸素水Ｗ２の水面Ｍ２への落下によって巻き込まれたり、又は、脱酸素水Ｗ２中に含まれていた、酸素を含む窒素ガス泡、酸素ガス泡、及び窒素ガス泡といった多数のガス泡Ｂ１と脱酸素水Ｗ２との混在が生じた後、ガス泡Ｂ１の浮上による脱酸素水Ｗ２からの分離が生じる。ガス分離部１２４には、窒素ガス供給ノズル１０２と接続されるガスノズル１２４ｂが、内部に貫通するように設けられている。 The gas separation unit 124 is a part that finally separates the deoxygenated water from the oxygen gas and nitrogen gas, takes out the deoxygenated water W2, and supplies the deoxygenated water W2 to the water supply tank 10. is there. The gas separation unit 124 has a lower supply port 124a that extends to a lower side of the tank water W1 in the water supply tank 10, and is connected to the water supply tank 10 therein so that the gas separation unit 124 is detached from the water surface M1 of the water supply tank 10 at substantially the same level. A water surface M2 of the oxygen water W2 is formed. And in this gas separation part 124, as shown in FIG. 2, below this water surface M2, it is caught by the fall of the deoxygenated water W2 onto the water surface M2, or is contained in the deoxygenated water W2. After the mixed gas bubbles B1 such as nitrogen gas bubbles containing oxygen, oxygen gas bubbles, and nitrogen gas bubbles and the deoxygenated water W2 are mixed, separation from the deoxygenated water W2 by the rising of the gas bubbles B1 Occurs. The gas separation unit 124 is provided with a gas nozzle 124b connected to the nitrogen gas supply nozzle 102 so as to penetrate therethrough.

なお、水面Ｍ２の上下位置は、給水タンク１０の水位変動（高レベルＬ１と低レベルＬ２間の水位変動）に伴って変動するが、ガス分離部１２４の下端側が充分に下方まで延びているので、給水タンク１０の水位が低レベルＬ２になっても、ガス分離部１２４の水面Ｍ２下方には、充分な上下長さが確保されている。 Although the vertical position of the water surface M2 varies with the water level fluctuation (water level fluctuation between the high level L1 and the low level L2) of the water supply tank 10, the lower end side of the gas separation unit 124 extends sufficiently downward. Even when the water level of the water supply tank 10 becomes the low level L2, a sufficient vertical length is secured below the water surface M2 of the gas separation unit 124.

散気管１２６は、窒素ガスＮを脱酸素塔１２内に供給するものであるが、ガス分離部１２４の水面Ｍ２下方に配置されていて、窒素ガスＮを脱酸素水Ｗ２中で多数の窒素ガス小泡Ｂ２にして供給する機能を有するものである。この散気管１２６は、例えば、パンチングメタル等によって側面に多数の小孔（例えば直径１ｍｍの孔）が形成された、上下密閉タイプの円筒体から形成されている。この散気管１２６は、ガス分離部１２４内にこれと同心状に配置され、外径がガス分離部１２４内における脱酸素水Ｗ２等の流れに支障を生じさせないように充分小さく定められているとともに、下面側がガス分離部１２４のガスノズル１２４ｂの上向き内端と接続されて、このガスノズル１２４ｂを介してガス分離部１２４側に支持されている。この散気管１２６は、給水タンク１０の水位が低レベルＬ２のときの、ガス分離部１２４内の水面Ｍ２より、少なくとも距離Ｚ１だけ下方のガス分離部１２４内に位置決めされる。 The air diffuser 126 supplies nitrogen gas N into the deoxygenation tower 12, but is disposed below the water surface M2 of the gas separation unit 124, and the nitrogen gas N is removed from the deoxygenated water W2 by a large number of nitrogen gases. It has a function to supply as small bubbles B2. The air diffuser 126 is formed of, for example, a vertically sealed cylindrical body in which a large number of small holes (for example, holes having a diameter of 1 mm) are formed on a side surface by punching metal or the like. The air diffuser 126 is disposed concentrically in the gas separation unit 124, and the outer diameter is determined to be sufficiently small so as not to hinder the flow of the deoxygenated water W2 and the like in the gas separation unit 124. The lower surface side is connected to the upward inner end of the gas nozzle 124b of the gas separation unit 124, and is supported on the gas separation unit 124 side via the gas nozzle 124b. The air diffuser 126 is positioned in the gas separation unit 124 at least a distance Z1 below the water surface M2 in the gas separation unit 124 when the water level of the water supply tank 10 is at the low level L2.

ここで、散気管１２６の作用効果について説明する。
ガス分離部１２４内の水面Ｍ２より下方は、脱酸素水Ｗ２の落下によって巻き込まれたり、又は、脱酸素水Ｗ２中に含まれていた多数のガス泡Ｂ１と、脱酸素水Ｗ２とが混合した状態となっており、この状態で、脱酸素水Ｗ２は、一定の速度（例えば、０．２ｍ／Ｓの設計速度）で下降して、給水タンク１０側に移動する。この場合、ガス泡Ｂ１は、サイズが大きい場合は、速やかに上方に移動（浮上）して、脱酸素水Ｗ２と容易に分離されるが、サイズが小さくなればなるほど（マイクロバブルになればなるほど）、上昇速度が低下し、ガス分離部１２４の脱酸素水Ｗ２中に長時間漂って、なかなか分離されなかったり、場合によっては、脱酸素水Ｗ２と共に給水タンク１０内まで移動してしまうという事態が生じる。このことによって、脱酸素水Ｗ２中への酸素の再溶解が生じ、脱酸素塔１２による脱酸素率の低下が生じる。リアクター部１２１，１２２の性能を上げて被処理水を細かく粒子状にする程、脱酸素水Ｗ２中に含まれるガス泡も小径化する。よって、脱酸素能力は、リアクター部１２１，１２２の性能を上げても向上しなくなる。 Here, the effect of the diffuser 126 will be described.
Below the water surface M2 in the gas separator section 124, or caught by the falling of deoxygenated water W2, or the number of gas bubbles B1 that was contained in the deoxygenated water W2, the deoxygenated water W2 are mixed In this state, the deoxygenated water W2 descends at a constant speed (for example, a design speed of 0.2 m / S) and moves to the water supply tank 10 side. In this case, when the size of the gas bubble B1 is large, the gas bubble B1 quickly moves upward (floats) and is easily separated from the deoxygenated water W2. However, the smaller the size is, the more microbubbles are formed. ), The rising speed decreases, drifts in the deoxygenated water W2 of the gas separation unit 124 for a long time, and is not easily separated, or in some cases, moves into the water supply tank 10 together with the deoxygenated water W2. Occurs. As a result, re-dissolution of oxygen into the deoxygenated water W2 occurs, and the deoxygenation rate by the deoxygenation tower 12 decreases. The gas bubbles contained in the deoxygenated water W2 are also reduced in diameter as the performance of the reactor units 121 and 122 is increased to make the water to be treated finer particles. Therefore, the oxygen removal capacity does not improve even if the performance of the reactor parts 121 and 122 is increased.

したがって、ガス泡Ｂ１の上昇速度を、脱酸素水Ｗ２の下降速度（０．２ｍ／Ｓ）より大きくする必要があるが、この場合のガス泡Ｂ１の外径は、ストークスの公式によって、０．４２ｍｍと計算される。すなわち、ガス泡Ｂ１の外径を０．４２ｍｍ以上とすれば、ガス泡Ｂ１は、ガス分離部１２４中の脱酸素水Ｗ２中に留まるか、又は、ガス分離部１２４中を上昇して脱酸素水Ｗ２と分離される。散気管１２６は、ガス泡Ｂ１の外径を、０．４２ｍｍより充分に大きくして、このガス泡Ｂ１を脱酸素水Ｗ２から速やかに分離させる機能を有している。 Therefore, it is necessary to make the rising speed of the gas bubble B1 larger than the descending speed (0.2 m / S) of the deoxygenated water W2. In this case, the outer diameter of the gas bubble B1 is 0. Calculated as 42 mm. That is, if the outer diameter of the gas bubble B1 is 0.42 mm or more, the gas bubble B1 stays in the deoxygenated water W2 in the gas separation unit 124 or rises in the gas separation unit 124 and deoxygenates. Separated from water W2. The air diffuser 126 has a function of making the outer diameter of the gas bubble B1 sufficiently larger than 0.42 mm and quickly separating the gas bubble B1 from the deoxygenated water W2.

すなわち、ガス分離部１２４の水面Ｍ２下方の脱酸素水Ｗ２中で、窒素ガスＮの供給に当たって、図２で示されるように、散気管１２６により、例えば、外径が１ｍｍ以上の多数の窒素ガス小泡Ｂ２を発生させ、この窒素ガス小泡Ｂ２の上昇中に、この窒素ガス小泡Ｂ２とサイズの小さなガス泡Ｂ１とが衝突して、ガス泡Ｂ１は、窒素ガス小泡Ｂ２に取り込まれて全体サイズが拡大し、速やかに脱酸素水Ｗ２から分離される。ここで、窒素ガス小泡Ｂ２をガス泡Ｂ１に充分に衝突させるためには、ガス分離部１２４内の水面Ｍ２から散気管１２６までの距離Ｚ２が、ある程度必要となる。 That is, in supplying the nitrogen gas N in the deoxygenated water W2 below the water surface M2 of the gas separation unit 124, as shown in FIG. 2, a large number of nitrogen gases having an outer diameter of 1 mm or more are provided by the air diffuser 126 as shown in FIG. A small bubble B2 is generated, and the nitrogen gas bubble B2 collides with the small gas bubble B1 while the nitrogen gas bubble B2 rises, and the gas bubble B1 is taken into the nitrogen gas bubble B2. As a result, the overall size is increased and it is quickly separated from the deoxygenated water W2. Here, in order to cause the nitrogen gas small bubbles B2 to sufficiently collide with the gas bubbles B1, a distance Z2 from the water surface M2 in the gas separation unit 124 to the air diffuser 126 is required to some extent.

図３は、給水タンク１０内の温水（タンク水Ｗ１）を循環させるようにして、脱酸素塔１２で脱酸素処理した場合の脱酸素率の変化を、散気管１２６の無い場合、散気管１２６と水面Ｍ２との距離Ｚ２が０．１５ｍの場合、散気管１２６と水面Ｍ２との距離Ｚ２が０．４ｍの場合について示している。ここで、脱酸素率Ｋ（％）は、脱酸素塔１２入口の被処理水の溶存酸素濃度をＤ０、脱酸素塔１２出口の脱酸素水Ｗ２の溶存酸素濃度をＤ１とすれば、
Ｋ＝（（Ｄ０−Ｄ１）／Ｄ０）×１００
で示される。 FIG. 3 shows the change in the deoxygenation rate when the deoxygenation treatment is performed in the deoxygenation tower 12 by circulating the hot water (tank water W1) in the water supply tank 10. When the distance Z2 between the water surface M2 and the water surface M2 is 0.15 m, the distance Z2 between the air diffuser 126 and the water surface M2 is 0.4 m. Here, the deoxygenation rate K (%) can be determined by assuming that the dissolved oxygen concentration of the water to be treated at the inlet of the deoxygenation tower 12 is D0 and the dissolved oxygen concentration of the deoxygenated water W2 at the outlet of the deoxygenation tower 12 is D1.
K = ((D0−D1) / D0) × 100
Indicated by

図３から、脱酸素率Ｋは、脱酸素塔１２の運転時間にはあまり関係せず、散気管１２６の無い場合には８４％であり、散気管１２６と水面Ｍ２との距離Ｚ２が０．１５ｍの場合には８９％であり、散気管１２６と水面Ｍ２との距離Ｚ２が０．４ｍの場合には９４％であることが分かった。このことから、この脱酸素塔１２では、散気管１２６が無い場合に比べて、散気管１２６がある場合に、脱酸素率が充分に高くなることが分かるとともに、散気管１２６がある場合でも、距離Ｚ２が大きい方が脱酸素率が高くなることが分かる。ここで、距離Ｚ２が０．４ｍより大きい場合の脱酸素率と、距離Ｚ２が０．４ｍの場合の脱酸素率とには、大きな変化は見られなかったので、距離Ｚ２の最適値は、０．４ｍであることが分かった。すなわち、散気管１２６は、給水タンク１０の水位が低レベルＬ２のときの、ガス分離部１２４内の水面Ｍ２からの距離Ｚ１が、０．４ｍ以上となる位置に配置されるのが最適である。 From FIG. 3, the deoxygenation rate K is not so related to the operation time of the deoxygenation tower 12, and is 84% when the air diffuser 126 is not present, and the distance Z2 between the air diffuser 126 and the water surface M2 is 0. It was found that it was 89% when the distance was 15 m, and 94% when the distance Z2 between the air diffuser 126 and the water surface M2 was 0.4 m. From this, in this deoxygenation tower 12, it can be seen that the deoxygenation rate is sufficiently high when the air diffuser 126 is present, compared with the case where the air diffuser 126 is not present, and even when the air diffuser 126 is present, It can be seen that the larger the distance Z2, the higher the deoxygenation rate. Here, since there was no significant change in the deoxygenation rate when the distance Z2 is greater than 0.4 m and the deoxygenation rate when the distance Z2 is 0.4 m, the optimum value of the distance Z2 is It was found to be 0.4 m. That is, the air diffusion pipe 126 is optimally disposed at a position where the distance Z1 from the water surface M2 in the gas separation unit 124 is 0.4 m or more when the water level of the water supply tank 10 is at the low level L2. .

一方、ガス分離部１２４の下端の供給口１２４ａ近傍に散気管１２６があると、散気管１２６周りのガス泡Ｂ１が、給水タンク１０内に入り込み易いことが分かっている。このため、散気管１２６は、ガス分離部１２４の供給口１２４ａより、距離Ｚ３、例えば０．４ｍだけ上方にある方が望ましい。 On the other hand, it is known that the gas bubble B1 around the air diffusion pipe 126 easily enters the water supply tank 10 when the air diffusion pipe 126 is in the vicinity of the supply port 124a at the lower end of the gas separation unit 124. For this reason, it is desirable that the air diffusion pipe 126 is located at a distance Z3, for example, 0.4 m above the supply port 124a of the gas separation unit 124.

水処理ラインＲは、一端が給水タンク１０の循環水ノズル１０１に接続され、他端が脱酸素塔１２の取入ノズル１２０ａに接続されているとともに、逆止弁１６と定流量弁１７との間に補給ラインＳが接続されている。この水処理ラインＲでは、補給ラインＳの電磁弁１８が閉じている場合には、循環ポンプ１３の作動により、給水タンク１０内のタンク水Ｗ１が逆止弁１４と定流量弁１５とを通って、一定流量（例えば、ボイラの最大連続負荷時に要求される給水量より多い流量Ｑ）で脱酸素塔１２に供給される。また、この水処理ラインＲでは、補給ラインＳの電磁弁１８が開いている場合には、所定流量ｑ（例えば、ボイラの最大連続負荷時に要求される給水量と同量）の補給水Ｗ０と、タンク水Ｗ１とが、一定の処理流量Ｑ（したがって、タンク水Ｗ１の流量は、流量Ｑ−流量ｑとなる）となるように脱酸素塔１２に供給される。 One end of the water treatment line R is connected to the circulating water nozzle 101 of the water supply tank 10, the other end is connected to the intake nozzle 120 a of the deoxygenation tower 12, and the check valve 16 and the constant flow valve 17 are connected to each other. A supply line S is connected between them. In this water treatment line R, when the solenoid valve 18 of the replenishment line S is closed, the tank water W1 in the water supply tank 10 passes through the check valve 14 and the constant flow valve 15 by the operation of the circulation pump 13. Thus, the deoxygenation tower 12 is supplied at a constant flow rate (for example, a flow rate Q higher than the amount of water supply required at the maximum continuous load of the boiler). Further, in this water treatment line R, when the solenoid valve 18 of the replenishment line S is open, the replenishment water W0 having a predetermined flow rate q (for example, the same amount as the water supply amount required at the maximum continuous load of the boiler) The tank water W1 is supplied to the deoxygenation tower 12 so as to have a constant processing flow rate Q (therefore, the flow rate of the tank water W1 is the flow rate Q−the flow rate q).

補給ラインＳは、脱酸素塔１２を介して給水タンク１０側に流量ｑの補給水Ｗ０を供給するものである。流量調節弁１７は、補給水Ｗ０が流量ｑになるように弁開度を制御する。給水ラインＴは、ボイラ側の要求に応じて、ボイラ側にボイラ給水Ｗ３を送るものである。窒素ガス供給ラインＵは、給水タンク１０の窒素ガスノズル１０２と接続されて、脱酸素塔１２の散気管１２７に、脱酸素処理用の窒素ガスＮを一定流量（水処理ラインＲにおける処理流量Ｑの１／５程度）で供給するものである。 The replenishment line S supplies replenishment water W0 having a flow rate q to the water supply tank 10 via the deoxygenation tower 12. The flow rate control valve 17 controls the valve opening so that the makeup water W0 becomes the flow rate q. The water supply line T sends boiler feed water W3 to the boiler side in response to a request on the boiler side. The nitrogen gas supply line U is connected to the nitrogen gas nozzle 102 of the water supply tank 10, and nitrogen gas N for deoxygenation treatment is supplied to the aeration pipe 127 of the deoxygenation tower 12 at a constant flow rate (of the treatment flow rate Q in the water treatment line R). (About 1/5).

つぎに、この窒素置換式脱酸素装置１の作用効果について説明する。
ボイラ運転前の給水タンク１０内は、温度の高いタンク水Ｗ１が、タンク上部の水面Ｍ１近くに集まり、温度の低いタンク水Ｗ１が、給水取り出し口（給水ノズル１００）近くのタンク下部に集まっている。水面Ｍ１は、空気に触れているので、水面Ｍ１近くのタンク水Ｗ１の溶存酸素濃度は上がっているとともに、タンク下部の温度の低いタンク水Ｗ１の溶存酸素濃度も温度に見合った分だけ上昇している。したがって、ボイラ運転前に脱酸素塔１２等の運転を開始し、給水タンク１０内の溶存酸素濃度をある程度下げてやる必要がある。 Next, the function and effect of this nitrogen substitution type deoxygenation apparatus 1 will be described.
In the water supply tank 10 before the boiler operation, the tank water W1 having a high temperature gathers near the water surface M1 in the upper part of the tank, and the tank water W1 having a low temperature gathers in the lower part of the tank near the water supply outlet (water supply nozzle 100). Yes. Since the water surface M1 is in contact with the air, the dissolved oxygen concentration of the tank water W1 near the water surface M1 is increased, and the dissolved oxygen concentration of the tank water W1 having a lower temperature at the bottom of the tank is also increased by an amount corresponding to the temperature. ing. Therefore, it is necessary to start the operation of the deoxygenation tower 12 and the like before the boiler operation and lower the dissolved oxygen concentration in the feed water tank 10 to some extent.

そこで、ボイラの運転前には、一定時間、補給ラインＳの電磁弁１８を閉じた状態で、水処理ラインＲの循環ポンプ１３を運転し、被処理水となる給水タンク１０内のタンク水Ｗ１を、一定流量Ｑで、水処理ラインＲと脱酸素塔１２とを介して循環させるとともに、脱酸素塔１２に窒素ガスＮを供給して、タンク水Ｗ１の脱酸素塔１２による脱酸素処理を行う。 Therefore, before the operation of the boiler, the solenoid valve 18 of the replenishment line S is closed for a certain period of time, the circulation pump 13 of the water treatment line R is operated, and the tank water W1 in the water supply tank 10 that becomes the treated water. Is circulated through the water treatment line R and the deoxygenation tower 12 at a constant flow rate Q, and nitrogen gas N is supplied to the deoxygenation tower 12 to deoxidize the tank water W1 by the deoxygenation tower 12. Do.

ここで、脱酸素塔１２のガス分離部１２４内の、給水タンク１０との連通作用によって形成される水面Ｍ２下には、脱酸素水Ｗ２とともに、酸素を含んだ大小のガス泡Ｂ１が混在した状態になっている。この場合、大きいガス泡Ｂ１は、脱酸素水Ｗ２中を上昇して、この脱酸素水Ｗ２と容易に分離されるが、小さいガス泡Ｂ１は、ガス分離部１２４内の脱酸素水Ｗ２中を浮遊したり、脱酸素水Ｗ２とともに給水タンク１０側に移動しようとする。一方、ガス分離部１２４の水面Ｍ２下には、脱酸素用の窒素ガスＮが供給されるが、この窒素ガスＮが、散気管１２６によって、多数の窒素ガス小泡Ｂ２として脱酸素水Ｗ２中を上昇するように供給される。このため、この窒素ガス小泡Ｂ２とガス泡Ｂ１とが衝突し、このガス泡Ｂ１が、窒素ガス小泡Ｂ２に取り込まれて脱酸素水Ｗ２中を上昇し、脱酸素水Ｗ２と速やかに分離され、ガス泡Ｂ１による酸素の再溶解が防止される。 Here, under the water surface M2 formed by the communication action with the water supply tank 10 in the gas separation part 124 of the deoxygenation tower 12, together with the deoxygenated water W2, large and small gas bubbles B1 containing oxygen are mixed. It is in a state. In this case, the large gas bubbles B1 rise in the deoxygenated water W2 and are easily separated from the deoxygenated water W2. However, the small gas bubbles B1 pass through the deoxygenated water W2 in the gas separation unit 124. It floats or tries to move to the water supply tank 10 side together with the deoxygenated water W2. On the other hand, nitrogen gas N for deoxygenation is supplied below the water surface M2 of the gas separation unit 124. This nitrogen gas N is converted into a large number of nitrogen gas bubbles B2 by the air diffuser 126 in the deoxygenated water W2. Supplied to rise. For this reason, the nitrogen gas bubble B2 and the gas bubble B1 collide, and the gas bubble B1 is taken into the nitrogen gas bubble B2 and rises in the deoxygenated water W2, and is quickly separated from the deoxygenated water W2. Thus, re-dissolution of oxygen by the gas bubbles B1 is prevented.

循環ポンプ１３等を一定時間運転して、タンク水Ｗ１全体の溶存酸素濃度が所定値より低下した後、ボイラの運転が開始される。ボイラの運転に伴い、給水タンク１０の水面Ｍ１のレベルが、低レベルＬ２に達すると、電磁弁１８が開けられ、補給ラインＳから、所定流量ｑの補給水Ｗ０が補給されるので、給水タンク１０からは、流量Ｑ−流量ｑ分のタンク水Ｗ１が循環することとなる。この場合、ボイラの負荷が、小さい場合には、給水タンク１０の水位は上がるが、ボイラの負荷が、最大連続負荷と同じ場合には、給水タンク１０の水位は変動しない。そして、給水タンク１０の水位が高レベルＬ１に達すると、電磁弁１８が閉じられ、補給ラインＳからの補給水Ｗ０の供給は停止される。なお、脱酸素塔１２に供給される水の流量が一定なので、脱酸素塔１２に供給される窒素ガスＮの流量も、変動させる必要はない。 The operation of the boiler is started after the circulating pump 13 and the like are operated for a certain period of time and the dissolved oxygen concentration in the entire tank water W1 falls below a predetermined value. When the level of the water surface M1 of the water supply tank 10 reaches the low level L2 with the operation of the boiler, the electromagnetic valve 18 is opened and the supply water W0 having a predetermined flow rate q is supplied from the supply line S. 10, the tank water W1 corresponding to the flow rate Q-flow rate q is circulated. In this case, when the load on the boiler is small, the water level of the feed water tank 10 rises, but when the load on the boiler is the same as the maximum continuous load, the water level of the feed water tank 10 does not fluctuate. When the water level in the water supply tank 10 reaches the high level L1, the electromagnetic valve 18 is closed and the supply of the makeup water W0 from the makeup line S is stopped. Since the flow rate of water supplied to the deoxygenation tower 12 is constant, the flow rate of the nitrogen gas N supplied to the deoxygenation tower 12 does not need to be changed.

ところで、給水タンク１０の水位が減少すると、給水タンク１０に連通する脱酸素塔１２内の水面Ｍ２の位置もこれに伴って下降し、脱酸素塔１２の水面Ｍ２より上の空間部分の体積もその分増加する。ここで、給水タンク１０と脱酸素塔１２との断面積比は１００：１で設計され、かつ、窒素ガスＮの供給量は、水処理ラインＲの流量Ｑの約１／５、すなわち、Ｑ／５である。このため、給水タンク１０上部の空間部Ｖの体積が、実際には、ボイラへの給水量分だけ増加するが、最大Ｑ（ｍ３／ｍｉｎ）の割合で増加して、脱酸素塔１２の空間部が、最大Ｑ／１００（ｍ３／ｍｉｎ）の割合で増えたと考えた場合でも、窒素ガスＮの供給量は、Ｑ／５（ｍ３／ｍｉｎ）であり、脱酸素塔１２の空間部の増分の２０倍もある。したがって、給水タンク１０の水位の減少によって、脱酸素塔１２のガス排出部１２５から外気を吸引してしまうことはない。 By the way, when the water level of the water supply tank 10 decreases, the position of the water surface M2 in the deoxygenation tower 12 communicating with the water supply tank 10 also falls, and the volume of the space portion above the water surface M2 of the deoxygenation tower 12 also increases. Increase by that amount. Here, the cross-sectional area ratio between the water supply tank 10 and the deoxygenation tower 12 is designed to be 100: 1, and the supply amount of the nitrogen gas N is about 1/5 of the flow rate Q of the water treatment line R, that is, Q / 5. For this reason, the volume of the space V at the upper part of the water supply tank 10 actually increases by the amount of water supplied to the boiler, but increases at a rate of maximum Q (m3 / min), and the space of the deoxygenation tower 12 increases. Even if it is considered that the portion has increased at a rate of maximum Q / 100 (m3 / min), the supply amount of the nitrogen gas N is Q / 5 (m3 / min), and the increment of the space portion of the deoxygenation tower 12 There are 20 times as much. Therefore, outside air is not sucked from the gas discharge part 125 of the deoxygenation tower 12 due to a decrease in the water level of the water supply tank 10.

以上のように、この窒素置換式脱酸素装置１では、脱酸素塔１２と給水タンク１０とを一体となるように設けて、脱酸素塔１２からの脱酸素水Ｗ２を、直接、ボイラの給水タンク１０に供給できるようにしているので、ボイラの給水タンク１０を脱酸素塔１２の貯水タンクとして用いることができ、装置の簡単化、低コスト化等を図ることができる。この場合、脱酸素塔１２の下部のガス分離部１２４の多くの部分を給水タンク１０の水面Ｍ１下に水没させるようにしているので、ガス分離部１２４には、給水タンク１０との連通作用により脱酸素水Ｗ２の水面Ｍ２が形成される。このため、この窒素置換式脱酸素装置１では、この水面Ｍ２下において、この水面Ｍ２に落下した脱酸素水Ｗ２と、落下に当たり巻き込まれたり又は脱酸素水Ｗ２に含まれていたガス泡Ｂ１とが混合した状態になっても、ガス分離部１２４の水面Ｍ２下の長さがある程度あれば、大部分のガス泡Ｂ１はガス分離部１２４中を浮上して脱酸素水Ｗ２と分離され、この脱酸素塔１２により充分な脱酸素効果を得ることができる。 As described above, in this nitrogen substitution type deoxygenation apparatus 1, the deoxygenation tower 12 and the water supply tank 10 are provided so as to be integrated, and the deoxygenation water W2 from the deoxygenation tower 12 is directly supplied to the boiler water supply. Since it can supply to the tank 10, the water supply tank 10 of a boiler can be used as a water storage tank of the deoxygenation tower 12, and simplification of an apparatus, cost reduction, etc. can be achieved. In this case, many parts of the gas separation unit 124 below the deoxygenation tower 12 are submerged under the water surface M1 of the water supply tank 10, so that the gas separation unit 124 has a communication effect with the water supply tank 10. A water surface M2 of the deoxygenated water W2 is formed. For this reason, in this nitrogen substitution type deoxygenation apparatus 1, under this water surface M2, deoxygenated water W2 that has fallen to this water surface M2, and gas bubbles B1 that are involved in the fall or contained in the deoxygenated water W2 If the gas separation part 124 has a certain length below the water surface M2 even if it is in a mixed state, most of the gas bubbles B1 float up in the gas separation part 124 and are separated from the deoxygenated water W2. A sufficient deoxygenation effect can be obtained by the deoxygenation tower 12.

また、この窒素置換式脱酸素装置１では、脱酸素塔下部（ガス分離部１２４）内の脱酸素水Ｗ２の水面Ｍ２下に生じる、酸素等を含むガス泡Ｂ１を、脱酸素塔１２への窒素ガスＮの供給時に生じさせた多数の窒素ガス小泡Ｂ２に衝突させて、この窒素ガス小泡Ｂ２内に取り込むようにしているので、酸素等を含む小さなガス泡Ｂ１が、脱酸素塔１２の下部（ガス分離部１２４）内に漂ったり、給水タンク１０側に移動することはなく、このようなガス泡Ｂ１を、脱酸素水Ｗ２から直ちに分離することができる。このため、この窒素置換式脱酸素装置１では、酸素を含む小さなガス泡Ｂ１に起因する、酸素の脱酸素水Ｗ２への再溶解を防止することができ、装置の脱酸素効率の向上を図ることができる。 Further, in this nitrogen substitution type deoxygenation apparatus 1, gas bubbles B1 containing oxygen and the like generated under the water surface M2 of the deoxygenated water W2 in the lower part of the deoxygenation tower (gas separation section 124) are supplied to the deoxygenation tower 12. The nitrogen gas bubbles B2 collided with the nitrogen gas bubbles B2 generated during the supply of the nitrogen gas N and are taken into the nitrogen gas bubbles B2, so that the small gas bubbles B1 containing oxygen or the like are removed from the deoxygenation tower 12. The gas bubbles B1 can be immediately separated from the deoxygenated water W2 without drifting into the lower part (gas separation part 124) of the gas or moving to the water supply tank 10 side. For this reason, in this nitrogen substitution type deoxygenation apparatus 1, it is possible to prevent re-dissolution of oxygen into deoxygenated water W2 due to small gas bubbles B1 containing oxygen, and to improve the deoxygenation efficiency of the apparatus. be able to.

さらに、この窒素置換式脱酸素装置１では、給水タンク１０と脱酸素塔１２とを接続して、給水タンク１０内のタンク水Ｗ１を脱酸素処理のために脱酸素塔１２に供給する水処理ラインＲを設けるとともに、この水処理ラインＲに、補給水Ｗ０の補給ラインＳを接続している。このため、この窒素置換式脱酸素装置１では、補給水Ｗ０が供給される場合はもちろん、補給水Ｗ０の供給が無い場合でも、水処理ラインＲを使用して、脱酸素塔１２により、給水タンク１０内のタンク水Ｗ１の脱酸素処理を行うことができる。すなわち、この窒素置換式脱酸素装置１では、補給水Ｗ１が供給されない場合でも、給水タンク１０内のタンク水Ｗ１の溶存酸素濃度を減少でき、この脱酸素塔１２を効率的に使用することができる。 Furthermore, in this nitrogen substitution type deoxygenation apparatus 1, the water treatment tank 10 and the deoxygenation tower 12 are connected so that the tank water W1 in the water supply tank 10 is supplied to the deoxygenation tower 12 for the deoxidation treatment. A line R is provided, and a replenishment line S for make-up water W0 is connected to the water treatment line R. For this reason, in this nitrogen substitution type deoxygenation apparatus 1, not only when the makeup water W0 is supplied but also when the makeup water W0 is not supplied, the water treatment line R is used to supply the water. Deoxygenation of the tank water W1 in the tank 10 can be performed. That is, in this nitrogen substitution type deoxygenation apparatus 1, even when the makeup water W1 is not supplied, the dissolved oxygen concentration of the tank water W1 in the water supply tank 10 can be reduced, and this deoxygenation tower 12 can be used efficiently. it can.

実施形態２．
図４は、この発明の他の実施の形態に係る窒素置換式脱酸素装置２を示している。
この窒素置換式脱酸素装置２は、脱酸素水Ｗ２を貯める貯水タンク４０を有していて、処理水ラインＣを介して、ボイラの給水タンク１０から脱酸素塔１２に供給されたタンク水Ｗ１を、この脱酸素塔１２で脱酸素処理して貯水タンク４０内に貯め、この貯水タンク４０内の脱酸素水Ｗ２を、供給ラインＤを介して給水タンク１０側に供給するものである。なお、実施形態１で説明したものと、同一機能を有するものには同一符号を付しその説明を省略する。 Embodiment 2. FIG.
FIG. 4 shows a nitrogen substitution type deoxygenation apparatus 2 according to another embodiment of the present invention.
This nitrogen substitution type deoxygenation apparatus 2 has a water storage tank 40 for storing deoxygenated water W2, and tank water W1 supplied from a boiler water supply tank 10 to a deoxygenation tower 12 via a treated water line C. Is deoxygenated in the deoxygenation tower 12 and stored in the water storage tank 40, and deoxygenated water W2 in the water storage tank 40 is supplied to the water supply tank 10 side through the supply line D. In addition, the same code | symbol is attached | subjected to what has the same function as what was demonstrated in Embodiment 1, and the description is abbreviate | omitted.

窒素置換式脱酸素装置２は、脱酸素塔１２と、貯水タンク４０と、水位検出器４１と、処理水ラインＣと、供給ラインＤとから構成されている。なお、処理水ラインＣは、給水タンク１０と脱酸素塔１２とをつなぐものであり、処理ポンプ２４と、流量調整弁２５と、配管２６とから構成されている。供給ラインＤは、貯水タンク４０と給水タンク１０側の給水ラインＴとをつなぐものであり、供給ポンプ２７と、配管２８とから構成されている。 The nitrogen substitution type deoxygenation apparatus 2 includes a deoxygenation tower 12, a water storage tank 40, a water level detector 41, a treated water line C, and a supply line D. The treated water line C connects the water supply tank 10 and the deoxygenation tower 12 and includes a treatment pump 24, a flow rate adjustment valve 25, and a pipe 26. The supply line D connects the water storage tank 40 and the water supply line T on the side of the water supply tank 10, and includes a supply pump 27 and a pipe 28.

ここで、ボイラの給水タンク１０には、補給ラインＥを介して、補給水Ｗ０が供給され、給水タンク１０からは、給水ラインＴを介して、脱酸素処理されたタンク水Ｗ１（脱酸素水Ｗ２）がボイラに供給される。また、給水タンク１０の水位は、給水タンク１０の上面に設置された水位検出器１１で検知され、これが低レベルＬ２に達すると、補給ラインＥの電磁弁２９が開かれて、配管３０を介して給水タンク１０に補給水Ｗ０が供給され、これが高レベルＬ１に達すると、電磁弁２９が閉じられて、給水タンク１０への補給水Ｗ０の供給は停止される。 Here, the water supply tank 10 of the boiler is supplied with supply water W0 via a supply line E. From the water supply tank 10, tank water W1 (deoxygenated water) subjected to deoxygenation treatment via a water supply line T is supplied. W2) is supplied to the boiler. Further, the water level of the water supply tank 10 is detected by a water level detector 11 installed on the upper surface of the water supply tank 10, and when this reaches a low level L 2, the electromagnetic valve 29 of the replenishment line E is opened and connected via the pipe 30. When the makeup water W0 is supplied to the water supply tank 10 and reaches the high level L1, the electromagnetic valve 29 is closed and the supply of the makeup water W0 to the water supply tank 10 is stopped.

貯水タンク４０は、脱酸素塔１２で作った脱酸素水Ｗ２を所定時間分だけ貯めるものである。この貯水タンク４０には、側面下部に、供給ラインＤと接続される供給ノズル４００が設けられ、上面に、窒素ガス供給ラインＵと接続される窒素ガスノズル４０１と、水位検出器４１の取付部４０２とが設けられている。なお、窒素ガスノズル４０１は、貯水タンク４０の内方に延びている。 The water storage tank 40 stores the deoxygenated water W2 produced by the deoxygenation tower 12 for a predetermined time. The water storage tank 40 is provided with a supply nozzle 400 connected to the supply line D at the lower part of the side surface, and a nitrogen gas nozzle 401 connected to the nitrogen gas supply line U and an attachment part 402 for the water level detector 41 on the upper surface. And are provided. The nitrogen gas nozzle 401 extends inward of the water storage tank 40.

水位検出器４１は、貯水タンク４０の水位の高低にしたがって、処理水ラインＣの流量調整弁２５の開度を調整させ、貯水タンク４０内の脱酸素水Ｗ２の水位を一定に保つものである。なお、この場合でも、貯水タンク４０の水位は、僅かであるが、高レベルＬ３と低レベルＬ４に変化する。 The water level detector 41 adjusts the opening degree of the flow rate adjustment valve 25 of the treated water line C according to the level of the water level in the water storage tank 40, and keeps the water level of the deoxygenated water W2 in the water storage tank 40 constant. . Even in this case, the water level of the water storage tank 40 is slightly changed, but changes between the high level L3 and the low level L4.

脱酸素塔１２は、水供給部１２０と、リアクター部１２１と、整流部１２３と、リアクター部１２２と、ガス分離部１２４と、ガス排出部１２５と、散気管１２６とから構成されている。この脱酸素塔１２は、貯水タンク４０の上面側から、これを立てた状態で差し込むようにして、この貯水タンク４０の上面に、この貯水タンク４０と一体となるように取り付けられる。この場合、下側のリアクター部１２２は、貯水タンク４０の上方に配置されるが、下部のガス分離部１２４の大部分は貯水タンク４０内に配置され、このガス分離部１２４の多くの部分が貯水タンク４０の水面Ｍ３下に水没するように位置決めされる。この場合、水供給部１２０の取入ノズル１２０ａと処理水ラインＣとが接続され、ガス分離部１２４のガスノズル１２４ｂと貯水タンク４０の窒素ガスノズル４０１とが接続される。 The deoxygenation tower 12 includes a water supply unit 120, a reactor unit 121, a rectification unit 123, a reactor unit 122, a gas separation unit 124, a gas discharge unit 125, and an air diffuser 126. The deoxygenation tower 12 is attached to the upper surface of the water storage tank 40 so as to be integrated with the water storage tank 40 so as to be inserted in an upright state from the upper surface side of the water storage tank 40. In this case, the lower reactor section 122 is disposed above the water storage tank 40, but most of the lower gas separation section 124 is disposed within the water storage tank 40, and many parts of the gas separation section 124 are formed. The water storage tank 40 is positioned so as to be submerged under the water surface M3. In this case, the intake nozzle 120a of the water supply unit 120 and the treated water line C are connected, and the gas nozzle 124b of the gas separation unit 124 and the nitrogen gas nozzle 401 of the water storage tank 40 are connected.

この脱酸素塔１２でも、ガス分離部１２４内には、貯水タンク４０との連通作用によって、脱酸素水Ｗ２の水面Ｍ２が形成され、この水面Ｍ２が、貯水タンク４０の水面Ｍ３の高レベルＬ３と低レベルＬ４に対応して上下に変動している。また、この脱酸素塔１２でも、散気管１２６を、貯水タンク４０の水位が低レベルＬ４のときの、ガス分離部１２４内の水面Ｍ２より、少なくとも距離Ｚ１（０．４ｍ）だけ下方に配置しており、かつ、ガス分離部１２４の供給口１２４ａより、距離Ｚ３（０．４ｍ）だけ上方に配置している。 Also in this deoxygenation tower 12, a water surface M2 of deoxygenated water W2 is formed in the gas separation part 124 by the communication action with the water storage tank 40, and this water surface M2 is a high level L3 of the water surface M3 of the water storage tank 40. And it fluctuates up and down corresponding to the low level L4. Also in this deoxygenation tower 12, the air diffuser 126 is arranged at least a distance Z1 (0.4 m) below the water surface M2 in the gas separation unit 124 when the water level of the water storage tank 40 is at the low level L4. And a distance Z3 (0.4 m) above the supply port 124a of the gas separation unit 124.

したがって、この窒素置換式脱酸素装置２でも、脱酸素塔下部（ガス分離部１２４）内の脱酸素水Ｗ２の水面Ｍ２下に生じる、酸素等を含むガス泡Ｂ１を、脱酸素塔１２への窒素ガスＮの供給時に生じさせた多数の窒素ガス小泡Ｂ２に衝突させて、この窒素ガス小泡Ｂ２内に取り込むことができる。このため、この窒素置換式脱酸素装置２でも、酸素等を含む小さなガス泡Ｂ１が、脱酸素塔１２の下部（ガス分離部１２４）内に漂ったり、貯水タンク４０側に移動することはなく、このようなガス泡Ｂ１を、脱酸素水Ｗ２から直ちに分離することができる。このため、この窒素置換式脱酸素装置２でも、酸素を含む小さなガス泡Ｂ１に起因する、酸素の脱酸素水Ｗ２への再溶解を防止することができ、装置の脱酸素効率の向上を図ることができる。 Therefore, also in this nitrogen substitution type deoxygenation apparatus 2, the gas bubbles B1 containing oxygen and the like generated under the water surface M2 of the deoxygenated water W2 in the lower part of the deoxygenation tower (gas separation unit 124) are supplied to the deoxygenation tower 12. It can collide with a large number of nitrogen gas bubbles B2 generated at the time of supply of the nitrogen gas N and can be taken into the nitrogen gas bubbles B2. For this reason, even in this nitrogen substitution type deoxygenation apparatus 2, small gas bubbles B1 containing oxygen or the like do not drift in the lower part (gas separation part 124) of the deoxygenation tower 12 or move to the water storage tank 40 side. Such gas bubbles B1 can be immediately separated from the deoxygenated water W2. For this reason, even in this nitrogen substitution type deoxygenation apparatus 2, it is possible to prevent re-dissolution of oxygen in the deoxygenated water W2 due to the small gas bubbles B1 containing oxygen, and to improve the deoxygenation efficiency of the apparatus. be able to.

実施形態３．
図５は、この発明の他の実施の形態に係る窒素置換式脱酸素装置を示している。
この窒素置換式脱酸素装置３は、実施形態１で説明した給水タンク１０を貯水タンク４２に置き換え、かつ、脱酸素塔１２Ａを貯水タンク４２の側方に配置するとともに、脱酸素塔１２Ａの下部の端部を、貯水タンク４２の水面Ｍ４より下方の側面に接続したものであり、装置の機能等は、窒素置換式脱酸素装置１と同じである。なお、実施形態１、２で説明したものと、同一機能を有するものには同一符号を付しその説明を省略する。 Embodiment 3. FIG.
FIG. 5 shows a nitrogen substitution type deoxygenation apparatus according to another embodiment of the present invention.
This nitrogen-substitution deoxygenation device 3 replaces the water supply tank 10 described in the first embodiment with a water storage tank 42 and disposes the deoxygenation tower 12A on the side of the water storage tank 42, and at the bottom of the deoxygenation tower 12A. Is connected to the side surface below the water surface M4 of the water storage tank 42, and the function and the like of the device are the same as those of the nitrogen substitution type deoxygenation device 1. In addition, the same code | symbol is attached | subjected to what has the same function as what was demonstrated in Embodiment 1, 2, and the description is abbreviate | omitted.

窒素置換式脱酸素装置３は、貯水タンク４２と、水位検出器４３と、脱酸素塔１２Ａと、偏流防止手段４４と、支持架台４５と、水処理ラインＲと、補給ラインＳと、窒素ガスラインＵとから構成されている。 The nitrogen displacement deoxygenation apparatus 3 includes a water storage tank 42, a water level detector 43, a deoxygenation tower 12A, a drift prevention means 44, a support frame 45, a water treatment line R, a replenishment line S, and nitrogen gas. Line U.

貯水タンク４２は、貯水タンク４０と同様に、脱酸素塔１２で作った脱酸素水Ｗ２を所定時間分だけ貯めるものである。貯水タンク４２には、側面下部に、供給ラインＤと接続される供給ノズル４２０と、水処理ラインＲと接続される循環水ノズル４２１とが設けられ、側面の中程よりやや下側に、脱酸素塔１２Ａとの接続部となる脱酸素水ノズル４２２が設けられている。また、貯水タンク４２には、上面側に、水位検出器４３の取付部４２３と、外気との連通部となるベント管４２４とが設けられている。貯水タンク４２内の、タンク水Ｗ４上方の空間部Ｖには、水位の下降によってベント管４２４により外気が取り入れられるとともに、水位の上昇によって、ベント管４２４により空間部Ｖ内の空気が外部に排出される。 Similar to the water storage tank 40, the water storage tank 42 stores the deoxygenated water W2 produced by the deoxygenation tower 12 for a predetermined time. The water storage tank 42 is provided with a supply nozzle 420 connected to the supply line D and a circulating water nozzle 421 connected to the water treatment line R at the lower part of the side surface. A deoxygenated water nozzle 422 serving as a connection portion with the oxygen tower 12A is provided. In addition, the water storage tank 42 is provided with an attachment portion 423 of the water level detector 43 and a vent pipe 424 serving as a communication portion with the outside air on the upper surface side. Outside space is taken into the space V above the tank water W4 in the water storage tank 42 by the vent pipe 424 when the water level is lowered, and air in the space V is discharged to the outside by the vent pipe 424 when the water level is raised. Is done.

水位検出器４３は、供給ラインＤからの脱酸素水Ｗ２（タンク水Ｗ４）の流出に伴って、貯水タンク４２の水位が低レベルＬ６まで減少すると、補給ラインＳの電磁弁１８を開かせて、脱酸素塔１２Ａを介して補給水Ｗ０（脱酸素水Ｗ２）を貯水タンク４２に供給させるとともに、貯水タンク４２の水位が高レベルＬ５まで上昇すると、電磁弁１８を閉じさせて、補給水Ｗ０の供給を停止させる。 The water level detector 43 opens the solenoid valve 18 of the replenishment line S when the water level in the water storage tank 42 decreases to the low level L6 as the deoxygenated water W2 (tank water W4) flows out from the supply line D. When the makeup water W0 (deoxygenation water W2) is supplied to the water storage tank 42 via the deoxygenation tower 12A, and the water level of the water storage tank 42 rises to the high level L5, the solenoid valve 18 is closed to supply the makeup water W0. Stop supplying.

脱酸素塔１２Ａは、脱酸素塔１２のガス分離部１２４の下端部に、一端側が９０度屈曲して水平に延びる処理水供給部１２７が設けられたものである。この処理水供給部１２７は、脱酸素塔１２Ａの他の部分と同サイズに形成されており、脱酸素塔１２Ａからの脱酸素水Ｗ２を貯水タンク４２に供給するためのものである。 The deoxygenation tower 12A is provided with a treated water supply section 127 that is bent at 90 ° at one end side and extends horizontally at the lower end of the gas separation section 124 of the deoxygenation tower 12. The treated water supply unit 127 is formed in the same size as the other part of the deoxygenation tower 12A, and supplies deoxygenated water W2 from the deoxygenation tower 12A to the water storage tank.

この脱酸素塔１２Ａは、貯水タンク４２の側方に、上下方向に立った状態で設けられていて、貯水タンク４２側に屈曲して延びる処理水供給部１２７の端部が、貯水タンク４２の側面側に設けられた脱酸素水ノズル４２２に、フランジ部Ｆを介して直接接続されている。そして、この脱酸素塔１２Ａは、貯水タンク４２とは無関係に地上に設置された、簡単な支持架台４５によって支持される。また、貯水タンク４２内には、脱酸素水ノズル４２２と処理水供給部１２７とのフランジ部Ｆ間にリング板４４０（図６参照）を挟み付けるようにして、偏流防止手段４４の突き当て板４４１が内方に突出するように位置決めされている。偏流防止手段４４は、図６で示されるように、リング板４４０と突き当て板４４１とを複数の支持部材４４２で連結したもので、処理水供給部１２７から供給される脱酸素水Ｗ２に流れを与えて、この脱酸素水Ｗ２が貯水タンク４２全体に行き渡るようにするものである。 The deoxygenation tower 12 </ b> A is provided on the side of the water storage tank 42 so as to stand in the vertical direction, and the end of the treated water supply unit 127 that bends and extends toward the water storage tank 42 is connected to the water storage tank 42. It is directly connected to the deoxygenated water nozzle 422 provided on the side surface via the flange portion F. The deoxygenation tower 12A is supported by a simple support frame 45 installed on the ground regardless of the water storage tank 42. Further, in the water storage tank 42, a ring plate 440 (see FIG. 6) is sandwiched between the flange portions F of the deoxygenated water nozzle 422 and the treated water supply unit 127, so that the abutting plate of the drift prevention means 44. 441 is positioned so as to protrude inward. As shown in FIG. 6, the drift prevention means 44 is formed by connecting a ring plate 440 and a butting plate 441 with a plurality of support members 442, and flows into deoxygenated water W <b> 2 supplied from the treated water supply unit 127. The deoxygenated water W2 is distributed throughout the water storage tank 42.

この窒素置換式脱酸素装置３でも、窒素置換式脱酸素装置１と同様に、水処理ラインＲの一端が貯水タンク４２に接続され、水処理ラインＲの他端が脱酸素塔１２Ａに接続されていて、貯水タンク４２内のタンク水Ｗ４が、循環するようにしつつ、脱酸素塔１２Ａにより脱酸素処理される。 Also in this nitrogen substitution type deoxygenation device 3, as in the nitrogen substitution type deoxygenation device 1, one end of the water treatment line R is connected to the water storage tank 42, and the other end of the water treatment line R is connected to the deoxygenation tower 12A. The tank water W4 in the water storage tank 42 is deoxidized by the deoxygenation tower 12A while circulating.

この脱酸素塔１２Ａでも、ガス分離部１２４内には、貯水タンク４２との連通作用によって、脱酸素水Ｗ２の水面Ｍ２が形成され、この水面Ｍ２が、貯水タンク４０の水面Ｍ４の高レベルＬ３と低レベルＬ４に対応して上下に変動している。また、この脱酸素塔１２Ａでも、散気管１２６を、貯水タンク４０の水位が低レベルＬ６のときの、ガス分離部１２４内の水面Ｍ２より、少なくとも距離Ｚ１（０．４ｍ）だけ下方に配置しており、かつ、処理水供給部１２７の水平部より、距離Ｚ３（０．４ｍ）だけ上方に配置している。 Also in this deoxygenation tower 12A, a water surface M2 of deoxygenated water W2 is formed in the gas separation section 124 by the communication action with the water storage tank 42, and this water surface M2 is a high level L3 of the water surface M4 of the water storage tank 40. And it fluctuates up and down corresponding to the low level L4. Also in this deoxygenation tower 12A, the aeration pipe 126 is disposed at least a distance Z1 (0.4 m) below the water surface M2 in the gas separation unit 124 when the water level of the water storage tank 40 is at the low level L6. And it arrange | positions only distance Z3 (0.4m) from the horizontal part of the treated water supply part 127. FIG.

したがって、この窒素置換式脱酸素装置３でも、脱酸素塔下部（ガス分離部１２４）内の脱酸素水Ｗ２の水面Ｍ２下に生じる、酸素等を含むガス泡Ｂ１を、脱酸素塔１２への窒素ガスＮの供給時に生じさせた多数の窒素ガス小泡Ｂ２に衝突させて、この窒素ガス小泡Ｂ２内に取り込むことができる。このため、この窒素置換式脱酸素装置３でも、酸素等を含む小さなガス泡Ｂ１が、脱酸素塔１２Ａの下部（ガス分離部１２４や処理水供給部１２７）内に漂ったり、貯水タンク４０側に移動することはなく、このようなガス泡Ｂ１を、脱酸素水Ｗ２から直ちに分離することができる。このため、この窒素置換式脱酸素装置３でも、酸素を含む小さなガス泡Ｂ１に起因する、酸素の脱酸素水Ｗ２への再溶解を防止することができ、装置の脱酸素効率の向上を図ることができる。 Therefore, also in this nitrogen substitution type deoxygenation apparatus 3, the gas bubbles B1 containing oxygen and the like generated under the water surface M2 of the deoxygenated water W2 in the lower part of the deoxygenation tower (gas separation unit 124) are supplied to the deoxygenation tower 12. It can collide with a large number of nitrogen gas bubbles B2 generated at the time of supply of the nitrogen gas N and can be taken into the nitrogen gas bubbles B2. For this reason, even in this nitrogen substitution type deoxygenation device 3, small gas bubbles B1 containing oxygen or the like drift in the lower part of the deoxygenation tower 12A (the gas separation unit 124 and the treated water supply unit 127), or on the water storage tank 40 side. The gas bubbles B1 can be immediately separated from the deoxygenated water W2. For this reason, even in this nitrogen substitution type deoxygenation apparatus 3, it is possible to prevent re-dissolution of oxygen in the deoxygenated water W2 due to the small gas bubbles B1 containing oxygen, and to improve the deoxygenation efficiency of the apparatus. be able to.

なお、図７で示されるように、貯水タンク４２の本体部４２ａが複数の柱４２ｂで支持されている場合には、脱酸素塔１２Ａの処理水供給部１２７の端部を、貯水タンク４２の本体部４２ａの底部側に接続してもよい。 As shown in FIG. 7, when the main body portion 42 a of the water storage tank 42 is supported by a plurality of columns 42 b, the end of the treated water supply portion 127 of the deoxygenation tower 12 A is connected to the water storage tank 42. You may connect to the bottom part side of the main-body part 42a.

また、窒素置換式脱酸素装置３は、水処理ラインＲを有さず、補給ラインＳから直接、脱酸素塔１２Ａに給水されるものであってもよい。 Further, the nitrogen substitution type deoxygenation device 3 may not be provided with the water treatment line R but may be supplied directly from the replenishment line S to the deoxygenation tower 12A.

この発明の実施形態１に係る窒素置換式脱酸素装置を示す図である。It is a figure which shows the nitrogen substitution type deoxygenation apparatus which concerns on Embodiment 1 of this invention. 脱酸素塔のガス分離部内の脱酸素水等の流れの状態を示す図である。It is a figure which shows the state of the flow of deoxygenated water etc. in the gas separation part of a deoxygenation tower. 散気管がない脱酸素塔と、散気管がある脱酸素塔における脱酸素率の違い等を示すグラフである。It is a graph which shows the difference in the deoxygenation rate etc. in the deoxygenation tower without an air diffuser, and the deoxygenation tower with an air diffuser. この発明の実施形態２に係る窒素置換式脱酸素装置を示す図である。It is a figure which shows the nitrogen substitution type deoxygenation apparatus which concerns on Embodiment 2 of this invention. この発明の実施形態３に係る窒素置換式脱酸素装置を示す図である。It is a figure which shows the nitrogen substitution type deoxygenation apparatus which concerns on Embodiment 3 of this invention. 偏流防止手段の外観斜視図である。It is an external appearance perspective view of a drift prevention means. 脱酸素塔の処理水供給部を貯水タンクの底部に接続している状態を示す図である。It is a figure which shows the state which has connected the treated-water supply part of the deoxygenation tower to the bottom part of the water storage tank.

符号の説明Explanation of symbols

１，２，３窒素置換式脱酸素装置
１０給水タンク
１２，１２Ａ脱酸素塔
４０，４２貯水タンク
１２０水供給部（脱酸素塔の上部）
１２４ガス分離部（脱酸素塔の下部）
１２６散気管（窒素ガス供給部）
１２７処理水供給部（脱酸素塔の下部）
Ｂ２窒素ガス小泡（小泡）
Ｍ１給水タンクの水面
Ｍ２脱酸素塔の水面
Ｍ３，Ｍ４貯水タンクの水面
Ｎ窒素ガス
Ｗ０補給水（被処理水）
Ｗ１，Ｗ４タンク水（被処理水）
Ｗ２脱酸素水
1, 2, 3 Nitrogen substitution type deoxygenation device 10 Water supply tank 12, 12A Deoxygenation tower 40, 42 Water storage tank 120 Water supply part (upper part of deoxygenation tower)
124 Gas separation section (lower part of deoxygenation tower)
126 Air diffuser (nitrogen gas supply unit)
127 treated water supply section (lower part of deoxygenation tower)
B2 Nitrogen gas bubble (small bubble)
M1 Water surface of water tank M2 Water surface of deoxidation tower M3, M4 Water surface of water tank N Nitrogen gas W0 Makeup water (treated water)
W1, W4 tank water (treated water)
W2 deoxygenated water

Claims

上方側から供給されて下方に向かう被処理水と、下方側から供給されて上方に向かう窒素ガスとを接触させて、下部から溶存酸素が除去された脱酸素水が取り出され、上部から酸素を含んだ窒素ガスが排出される脱酸素塔と、前記脱酸素塔からの前記脱酸素水を貯める貯水タンクとを有した窒素置換式脱酸素装置であって、
前記脱酸素塔の下部の、前記貯水タンク側に向いた唯一の開口である前記脱酸素水の供給端側を、この貯水タンクの上面壁を貫通させて、その水面下に水没させた状態で、前記脱酸素塔を前記貯水タンクに取り付け、
かつ、前記脱酸素水が下向きに流れる、前記脱酸素塔の下部の、前記貯水タンクに連通して形成される水面より下方に、前記窒素ガスを多数の小泡にして前記脱酸素塔内に供給する窒素ガス供給部を設けていることを特徴とする窒素置換式脱酸素装置。 The treated water that is supplied from the upper side and is directed downward is brought into contact with the nitrogen gas that is supplied from the lower side and is directed upward, so that deoxygenated water from which dissolved oxygen has been removed is extracted from the lower part, and oxygen is removed from the upper part. A nitrogen-substituting deoxygenation device having a deoxygenation tower for discharging the contained nitrogen gas and a water storage tank for storing the deoxygenated water from the deoxygenation tower,
Wherein the lower portion of the oxygen column, the feed end side of the sole of the deoxygenated water is an opening facing the water storage tank side and is passed through the upper wall of the storage tank, while being submerged under the water surface , Attaching the deoxygenation tower to the water storage tank ,
And the deoxygenated water flows downward, below the water surface formed in communication with the water storage tank at the lower part of the deoxygenated tower, the nitrogen gas is made into a large number of small bubbles into the deoxygenated tower. A nitrogen-substituting deoxygenation device characterized in that a nitrogen gas supply unit is provided.

前記貯水タンクが、ボイラ側の要求に応じて、必要な量の脱酸素水をボイラ側に供給するための給水タンクであることを特徴とする請求項１記載の窒素置換式脱酸素装置 The nitrogen-replacement-type deoxygenation device according to claim 1, wherein the water storage tank is a water supply tank for supplying a necessary amount of deoxygenated water to the boiler side in response to a request from the boiler side.

上方側から供給されて下方に向かう処理水と、下方側から供給されて上方に向かう窒素ガスとを接触させて、下部から溶存酸素が除去された脱酸素水が取り出され、上部から酸素を含んだ窒素ガスが排出される脱酸素塔と、この脱酸素塔からの前記脱酸素水を貯める貯水タンクとを有した窒素置換式脱酸素装置であって、
前記脱酸素塔を前記貯水タンクの側方に配置して、この脱酸素塔の下部の脱酸素水供給端部を、前記貯水タンクの水面より下方の側面側又は前記貯水タンクの底面側に接続しており、
かつ、前記脱酸素水が下向きに流れる、前記脱酸素塔の下部の、前記貯水タンクに連通して形成される水面より下方に、前記窒素ガスを多数の小泡にして前記脱酸素塔内に供給する窒素ガス供給部を設けていることを特徴とする窒素置換式脱酸素装置。 The treated water supplied from the upper side and directed downward is brought into contact with the nitrogen gas supplied from the lower side and directed upward, and deoxygenated water from which dissolved oxygen is removed from the lower part is taken out, and oxygen is contained from the upper part. A nitrogen-replacement-type deoxygenation apparatus having a deoxygenation tower from which nitrogen gas is discharged and a water storage tank for storing the deoxygenated water from the deoxygenation tower,
The deoxygenation tower is disposed on the side of the water storage tank, and the deoxygenation water supply end at the bottom of the deoxygenation tower is connected to the side surface below the water surface of the water storage tank or the bottom surface side of the water storage tank. And
And the deoxygenated water flows downward, below the water surface formed in communication with the water storage tank at the lower part of the deoxygenated tower, the nitrogen gas is made into a large number of small bubbles into the deoxygenated tower. A nitrogen-substituting deoxygenation device characterized in that a nitrogen gas supply unit is provided.