JP2002022388A - Microorganism adhesion preventing method for external water intake heat exchange device - Google Patents
Microorganism adhesion preventing method for external water intake heat exchange deviceInfo
- Publication number
- JP2002022388A JP2002022388A JP2000199638A JP2000199638A JP2002022388A JP 2002022388 A JP2002022388 A JP 2002022388A JP 2000199638 A JP2000199638 A JP 2000199638A JP 2000199638 A JP2000199638 A JP 2000199638A JP 2002022388 A JP2002022388 A JP 2002022388A
- Authority
- JP
- Japan
- Prior art keywords
- external water
- water
- heat exchange
- temperature
- seawater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 147
- 244000005700 microbiome Species 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000498 cooling water Substances 0.000 claims abstract description 15
- 239000013505 freshwater Substances 0.000 claims description 29
- 239000000470 constituent Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000013535 sea water Substances 0.000 abstract description 75
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 8
- 229940014569 pentam Drugs 0.000 description 8
- YBVNFKZSMZGRAD-UHFFFAOYSA-N pentamidine isethionate Chemical compound OCCS(O)(=O)=O.OCCS(O)(=O)=O.C1=CC(C(=N)N)=CC=C1OCCCCCOC1=CC=C(C(N)=N)C=C1 YBVNFKZSMZGRAD-UHFFFAOYSA-N 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水、河川水、海
水等の外水を外水配管系統を通して熱交換器に導き外水
と冷却水を熱交換する外水取水熱交換装置の外水と接す
る部分への微生物の付着を防止する外水取水熱交換装置
の微生物付着防止方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external water of an external water intake heat exchange device for guiding external water such as sewage, river water, seawater, etc. to a heat exchanger through an external water piping system to exchange heat between external water and cooling water. The present invention relates to a method for preventing the attachment of microorganisms to an external water intake heat exchange device for preventing the attachment of microorganisms to a portion in contact with water.
【０００２】[0002]
【従来の技術】従来、海水を冷却水として使用する蒸気
タービン復水器では、ブラシやボールにより、熱交換器
細管内のスケールやスカムを機械的に除去する方法が行
われている。冷凍機の冷却源を冷却塔循環水でなく、下
水、河川水、海水に求めるシステムは冷却塔への補給水
が不要になるだけでなく、外気の湿球温度より決められ
た冷却温度よりも低い水温であり、冷凍機の成績数が向
上することが知られており新エネ促進法では「温度差エ
ネルギー」と呼ばれる技術として知られている。2. Description of the Related Art Conventionally, in a steam turbine condenser using seawater as cooling water, a method of mechanically removing scale and scum in a heat exchanger thin tube by a brush or a ball has been used. A system that requires the cooling source of the refrigerator to be not circulating water in the cooling tower but sewage, river water, and seawater not only eliminates the need for replenishing water to the cooling tower, but also reduces the cooling temperature determined from the wet bulb temperature of the outside air. It is known that the water temperature is low and the number of performances of the refrigerator is improved, and is known as a technique called “temperature difference energy” in the new energy promotion method.
【０００３】海水等を冷凍機の凝縮器に直接入れる直接
方式と、凝縮器と海水等の間に熱交換器を置く間接熱交
換方式がある。間接熱交換方式では凝縮器と熱交換器の
配管中には清水を循環させ、海水等と水−水熱交換器で
熱交換される。該水−水熱交換器の形式はシェル＆チュ
ーブ方式と、プレート方式の二つがある。プレート方式
は総括伝熱係数がシェル＆チューブ方式の総括伝熱係数
よりも高く、伝熱面積が少ないことと、プレス技術によ
る大量生産に適していることから、水−水熱交換器では
広く採用されている。There are a direct system in which seawater or the like is directly introduced into a condenser of a refrigerator and an indirect heat exchange system in which a heat exchanger is provided between the condenser and seawater. In the indirect heat exchange system, fresh water is circulated in the piping between the condenser and the heat exchanger, and heat is exchanged with seawater or the like by the water-water heat exchanger. There are two types of the water-water heat exchanger, a shell & tube type and a plate type. The plate type has a higher overall heat transfer coefficient than the shell and tube overall heat transfer coefficient, has a small heat transfer area, and is suitable for mass production by press technology, so it is widely used in water-water heat exchangers. Have been.
【０００４】海水等を取水した後、２ｍｍ径の孔が開か
れた円筒状スクリーンを持つオートストレーナはプレー
ト式熱交換器の隙間２．８ｍｍ以上の異物が入らないよ
うにしている。[0004] An auto-strainer having a cylindrical screen having a hole of 2 mm diameter after taking in seawater or the like prevents foreign substances having a gap of 2.8 mm or more in the plate heat exchanger from entering.
【０００５】海水を熱源水として使用した場合、プレー
ト式熱交換器に微生物が付着し、熱交換性能が低下する
と共に、圧力損失が増加するので、頻繁にプレート式熱
交換器を分解し、清掃する必要がある。[0005] When seawater is used as heat source water, microorganisms adhere to the plate-type heat exchanger, heat exchange performance is reduced, and pressure loss increases. Therefore, the plate-type heat exchanger is frequently disassembled and cleaned. There is a need to.
【０００６】微生物が付着しないためには、次亜塩素酸
ソーダを海水に注入殺菌（微生物死滅）する方法があ
る。この方法は薬品費用を必要とする他、ｐＨ調整のた
めの中和装置も必要となる。また、海水にオゾンを照射
して殺菌する方法もあるが、この方法はオゾン発生装置
を必要とする。In order to prevent microorganisms from adhering, there is a method in which sodium hypochlorite is injected into seawater and sterilized (killed by microorganisms). This method requires chemical costs and also requires a neutralizing device for pH adjustment. There is also a method of sterilizing seawater by irradiating it with ozone, but this method requires an ozone generator.
【０００７】また、熱交換装置の海水を温水に置換し
て、殺菌する実施例もある。温水供給設備と海水取水装
置との距離が短い場合には温水配管コストは問題となら
ないが、１，０００ｍ近く、海水取水設備と熱供給プラ
ントの距離が離れている場合は温水配管のコストが無視
できない。また、海水取水設備内に温水ボイラ等の熱源
設備を設置したとしても、燃料設備等も付帯しなければ
ならず設備費、維持費が上昇するという問題もある。There is also an embodiment in which seawater in a heat exchange device is replaced with warm water and sterilized. When the distance between the hot water supply equipment and the seawater intake device is short, the cost of the hot water piping is not a problem, but when the distance between the seawater intake equipment and the heat supply plant is close to 1,000 m, the cost of the hot water piping is ignored. Can not. Further, even if a heat source facility such as a hot water boiler is installed in the seawater intake facility, a fuel facility or the like must be additionally provided, and there is a problem that facility costs and maintenance costs increase.
【０００８】[0008]
【発明が解決しようとする課題】本発明は上述の点に鑑
みてなされたもので、安価な費用で外水取水熱交換装置
に微生物が付着するのを防止できる外水取水熱交換装置
の微生物付着防止方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-mentioned problems. An object of the present invention is to provide an adhesion preventing method.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
請求項１に記載の発明は、外水取水ポンプによりオート
ストレーナを通して熱交換器に外水を導く外水配管系統
を具備し、該外水と冷却水を熱交換する外水取水熱交換
装置の外水と接する部分への微生物の付着を防止するの
外水取水熱交換装置の微生物付着防止方法であって、外
水配管系統の熱交換器出口配管から外水取水ポンプの吸
込配管をつなぐバイパス配管を設けて外水が循環する外
水循環経路を形成し、外水取水ポンプを運転することに
より外水循環経路を循環する外水水温を６０℃以上に昇
温させことを特徴とする。According to the first aspect of the present invention, there is provided an external water piping system for guiding external water to a heat exchanger through an automatic strainer by an external water intake pump. A method for preventing the attachment of microorganisms to a portion of an external water intake heat exchange device that contacts heat with an external water of an external water intake heat exchange device that exchanges heat between water and cooling water, the method comprising: By providing a bypass pipe that connects the exchanger outlet pipe to the suction pipe of the external water intake pump to form an external water circulation path through which external water circulates, and by operating the external water intake pump, the external water temperature that circulates through the external water circulation path is controlled. It is characterized in that the temperature is raised to 60 ° C. or higher.
【００１０】上記のように熱交換器出口配管から外水取
水ポンプの吸込配管をつなぐバイパス配管を設けて外水
が循環する外水循環経路を形成し、外水取水ポンプを運
転することにより外水循環経路を循環する外水水温を６
０℃以上とするので、循環する外水水温中の微生物を殆
ど死滅させることができるから、外水と接触する部分に
微生物が付着するのを防止できる。[0010] As described above, a bypass pipe is provided from the heat exchanger outlet pipe to the suction pipe of the external water intake pump to form an external water circulation path through which external water circulates. Set the outside water temperature to 6
Since the temperature is set to 0 ° C. or higher, microorganisms in the circulating outside water temperature can be almost completely killed, so that it is possible to prevent the microorganisms from adhering to a portion that comes into contact with outside water.
【００１１】請求項２に記載の発明は、請求項１に記載
の外水取水熱交換装置の微生物付着防止方法において、
外水循環経路に連通するオートストレーナブロー弁を設
け、該オートストレーナブロー弁により、ブロー水量を
制御することにより循環外水温度を６０℃以上で外水接
触部構成材の許容温度以内とすることを特徴とする。According to a second aspect of the present invention, there is provided a method for preventing microorganisms from adhering to an external water intake heat exchange apparatus according to the first aspect,
An auto strainer blow valve communicating with the outside water circulation path is provided, and by controlling the blow water amount by the auto strainer blow valve, the temperature of the circulating outside water is controlled to be 60 ° C. or higher and within the allowable temperature of the constituent member of the outside water contact portion. Features.
【００１２】上記のように循環外水温度を６０℃以上で
外水接触部構成材の許容温度以内とすることにより、循
環する外水水温中の微生物を殆ど死滅させることができ
ると共に、外水と接する部分の構成部材を保護すること
ができる。例えば外水取水ポンプにケーシング、羽根車
の両方がペンタム樹脂である片吸込渦巻ポンプを用いて
もペンタム樹脂の許容温度以下とするからペンタム樹脂
は保護される。By setting the temperature of the circulating outside water to 60 ° C. or higher and within the allowable temperature of the constituent material of the outside water contact portion as described above, microorganisms in the circulating outside water temperature can be almost killed, and Can be protected. For example, even if a single suction centrifugal pump in which both the casing and the impeller are made of pentam resin is used as the external water intake pump, the pentam resin is protected because the temperature is lower than the allowable temperature of pentam resin.
【００１３】請求項３に記載の発明は、請求項１又は２
に記載の外水取水熱交換装置の微生物付着防止方法にお
いて、外水循環経路の外水を清水に置換する清水置換経
路を設け、外水循環経路の外水を清水に置換した後、外
水取水ポンプを運転することにより該外水循環経路を循
環する清水を上記温度に昇温させることができるように
したことを特徴とする。[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the method for preventing microorganisms from adhering to an external water intake heat exchanger according to the above, a fresh water replacement path for replacing external water in the external water circulation path with fresh water is provided, and after replacing the external water in the external water circulation path with fresh water, an external water intake pump. The fresh water circulating in the external water circulation path can be heated to the above-described temperature by operating the external water circulation path.
【００１４】外水循環経路の外水を清水に置換した後、
外水循環経路を循環する清水を上記温度以上に昇温させ
ることができるようにしたので、中間期、冬季のように
長期間、外水取水熱交換装置を休止する場合において
も、スカムの発生を防止することができる。After replacing the external water in the external water circulation path with fresh water,
Since the temperature of the fresh water circulating in the external water circulation path can be raised to the above temperature, scum is generated even when the external water intake heat exchange device is stopped for a long period of time, such as in the middle and winter. Can be prevented.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態例を図
面に基いて説明する。なお、本実施の形態例で示す数値
は１例であり、これに限定されるものでないことは当然
である。図１は本発明に係る海水取水熱交換器の系統構
成を示す図である。Embodiments of the present invention will be described below with reference to the drawings. It is to be noted that the numerical values shown in the present embodiment are merely examples, and are not limited to these. FIG. 1 is a diagram showing a system configuration of a seawater intake heat exchanger according to the present invention.
【００１６】図１において、１は海水を導く海水ポンプ
吸込水槽、２は海水取水ポンプ、３はオートストレー
ナ、４は熱交換器、５は冷却水ポンプ、６は冷凍凝縮
器、７は冷凍吸収器である。また、８は海水放流管、９
は熱交換器海水出口弁、１０はバイパス弁、１１はバイ
パス配管、１２は熱交換器冷却水入口弁、１３は海水温
度検出器、１４はオートストレーナブロー弁、１５は海
水ポンプ吸込弁、１６は清水置換弁、１７は清水タン
ク、１８は清水補給水、１９は導電率検出器、２０はブ
ロー配管である。In FIG. 1, 1 is a seawater pump suction water tank for guiding seawater, 2 is a seawater intake pump, 3 is an auto strainer, 4 is a heat exchanger, 5 is a cooling water pump, 6 is a refrigeration condenser, and 7 is a refrigeration absorption. It is a vessel. 8 is a seawater discharge pipe, 9
Is a heat exchanger seawater outlet valve, 10 is a bypass valve, 11 is a bypass pipe, 12 is a heat exchanger cooling water inlet valve, 13 is a seawater temperature detector, 14 is an automatic strainer blow valve, 15 is a seawater pump suction valve, 16 Is a fresh water displacement valve, 17 is a fresh water tank, 18 is fresh water makeup water, 19 is a conductivity detector, and 20 is a blow pipe.
【００１７】今海水温度が２５℃、取水量６０００ｍ3
／ｈ、許容温度差７℃を想定すると、海水放流温度は３
２℃、総熱交換量は１７５．８ＧＪ／ｈとなる。海水取
水ポンプ２は流量６００ｍ3／ｈ、全揚程３５ｍ、電動
機出力１１０ｋＷのものを１１台設置する。１１台の海
水取水ポンプ２の内、１台は予備機である。Now, the seawater temperature is 25 ° C. and the water intake is 6000 m 3.
/ H and an allowable temperature difference of 7 ° C, the seawater discharge temperature is 3
2 ° C., the total heat exchange amount is 175.8 GJ / h. 11 seawater intake pumps 2 having a flow rate of 600 m 3 / h, a total head of 35 m, and a motor output of 110 kW are installed. One of the eleven seawater intake pumps 2 is a spare machine.
【００１８】熱供給プラントの冷却水必要量は夏季ピー
ク時１００とすると、冬季の冷却水必要量は１０まで下
がることが想定される場合、１０台の台数分割は妥当で
ある。海水取水ポンプ２はポンプ容量が６００ｍ3／ｈ
程度まではケーシング、羽根車の両方がペンタム樹脂で
ある片吸込渦巻ポンプが実用化されており、金属製ポン
プにおける海水腐食の心配はない。Assuming that the cooling water requirement of the heat supply plant is 100 at the peak of summer, the cooling water requirement in winter is expected to decrease to 10, and it is reasonable to divide the number of cooling water into 10 units. Seawater intake pump 2 has a pump capacity of 600 m 3 / h
To the extent, a single suction centrifugal pump in which both the casing and the impeller are made of pentam resin has been put into practical use, and there is no need to worry about seawater corrosion in a metal pump.
【００１９】ポンプ吸込水槽１から海水が海水取水ポン
プ２に導かれ、オートストレーナ３より、２ｍｍ径以上
の固形物はオートストレーナ３内のスクリーンによって
捕捉される。オートストレーナ３を出た海水は熱交換器
４に導かれる。熱交換器４の形式はプレート式であり、
海水に対する腐食が少ないチタン製プレートを使用す
る。プレート間の隙間は２．８ｍｍ程度に製作されてい
るので、オートストレーナ３を通過した径２ｍｍ以下の
異物は熱交換器４を通過して、熱交換器海水出口弁９及
び海水放流管８を通して海に戻る。Seawater is guided from the pump suction water tank 1 to the seawater intake pump 2, and solids having a diameter of 2 mm or more are captured by the screen in the autostrainer 3 from the autostrainer 3. The seawater that has left the auto strainer 3 is guided to the heat exchanger 4. The type of the heat exchanger 4 is a plate type,
Use a titanium plate that is less corrosive to seawater. Since the gap between the plates is manufactured to be about 2.8 mm, foreign matter having a diameter of 2 mm or less that has passed through the auto strainer 3 passes through the heat exchanger 4 and passes through the heat exchanger seawater outlet valve 9 and the seawater discharge pipe 8. Return to the sea.
【００２０】本実施形態例の構成では、海水取水ポンプ
２、オートストレーナ３、熱交換器４からなる系列が１
１系列あり、その内１系列が予備となっているので、予
備系列の海水系統の温水殺菌（微生物死滅）とすること
が可能である。先ず、予備系列とした熱交換器海水出口
弁９を全閉とし、熱交換器４の出口と海水取水ポンプ２
と海水ポンプ吸込水槽１の間の吸込管とを接続するバイ
パス配管１１に設けられたバイパス弁１０を全開とす
る。予備系列の熱交換器４に冷却水が流れないように、
熱交換器冷却水入口弁１２を全閉とする。In the configuration of the present embodiment, the series consisting of the seawater intake pump 2, the automatic strainer 3, and the heat exchanger 4 has one system.
Since there is one line, one of which is reserved, it is possible to perform hot water sterilization (killing of microorganisms) of the seawater system of the reserved line. First, the heat exchanger seawater outlet valve 9 in the auxiliary system is fully closed, and the outlet of the heat exchanger 4 and the seawater intake pump 2
The bypass valve 10 provided in the bypass pipe 11 for connecting the suction pipe between the water tank 1 and the seawater pump suction tank 1 is fully opened. In order to prevent cooling water from flowing into the heat exchanger 4 of the auxiliary system,
The heat exchanger cooling water inlet valve 12 is fully closed.
【００２１】予備系列の海水取水ポンプ２を起動する
と、海水はオートストレーナ３、熱交換器４、バイパス
配管１１を循環する。ここで配管、機器からの放熱を除
くと、海水取水ポンプ２への軸動力は循環する海水の水
温上昇の入熱となる。熱交換器４、オートストレーナ
３、配管の保有水量を４ｍ3として、放熱を無視できる
ものとすると、海水取水ポンプ２の電動機から１００ｋ
Ｗの入熱は４ｍ3の循環海水に与えられ、放熱を無視で
きるものとすると時間あたりの水温上昇は２１℃とな
る。When the seawater intake pump 2 of the auxiliary system is started, the seawater circulates through the auto strainer 3, the heat exchanger 4, and the bypass pipe 11. Here, excluding heat radiation from piping and equipment, the shaft power to the seawater intake pump 2 becomes heat input due to a rise in the temperature of the circulating seawater. Assuming that the amount of water retained in the heat exchanger 4, the auto-strainer 3, and the piping is 4 m 3 , and the heat radiation can be ignored, 100 k from the electric motor of the seawater intake pump 2
The heat input of W is given to 4 m 3 of circulating seawater, and assuming that heat radiation can be ignored, the water temperature rise per hour is 21 ° C.
【００２２】海水取水ポンプ２の循環運転が２時間以上
となると微生物細胞の死滅温度である６０℃以上に達す
る。６０℃以上が１時間継続すると殆どの微生物が死滅
することが知られている。更に海水取水ポンプ２の循環
運転を継続すると海水水温は更に上昇し、８０℃に達す
る。ペンタム樹脂の許容温度は９０℃とされているの
で、海水取水ポンプ２の保護のため、海水取水ポンプ２
の出口に設けられた温度検出器１３の値が８０℃以上に
なった時、オートストレーナブロー弁１４を全開にす
る。When the circulation operation of the seawater intake pump 2 is carried out for 2 hours or more, the temperature reaches 60 ° C. or more, which is the temperature at which the microorganism cells are killed. It is known that most microorganisms are killed when the temperature is maintained at 60 ° C. or higher for one hour. If the circulation operation of the seawater intake pump 2 is further continued, the seawater temperature further rises and reaches 80 ° C. Since the allowable temperature of the pentam resin is 90 ° C., the seawater intake pump 2 is used to protect the seawater intake pump 2.
When the value of the temperature detector 13 provided at the outlet of the above becomes 80 ° C. or more, the automatic strainer blow valve 14 is fully opened.
【００２３】ブロー量に等しい海水が海水ポンプ吸込水
槽１より補給されるので循環水温度は低下する。前記温
度検出器１３で海水取水ポンプ２の出口温度の値が７５
℃以下になったら、オートストレーナブロー弁１４を全
閉にする。再度、循環水温が上昇し、前記操作を数回繰
返した時点で海水取水ポンプ２を停止する。この間、循
環海水の温度は６０℃以上で１時間以上保持されてお
り、海水中の微生物は死滅している。Since the seawater equal to the blow amount is supplied from the seawater pump suction water tank 1, the circulating water temperature decreases. With the temperature detector 13, the value of the outlet temperature of the seawater intake pump 2 is 75
When the temperature falls below ℃, the auto strainer blow valve 14 is fully closed. When the circulating water temperature rises again and the above operation is repeated several times, the seawater intake pump 2 is stopped. During this time, the temperature of the circulating seawater is maintained at 60 ° C. or higher for one hour or more, and the microorganisms in the seawater have died.
【００２４】中間期、冬季において長期間、熱交換器系
列を休止する場合は海水ポンプ吸込弁１５を全閉とし、
清水置換弁１６を全開とする。オートストレーナブロー
弁１４を全開とすると、清水タンク１７より、清水１８
が補給され、海水は清水に置換される。清水への置換の
確認はブロー配管２０に導電率検出器１９を設け、導電
率の低下をもって清水置換の完了とみなして、オートス
トレーナブロー弁１４を全閉にする。When the heat exchanger system is to be shut down for a long period of time in the middle and winter, the seawater pump suction valve 15 is fully closed,
The fresh water displacement valve 16 is fully opened. When the auto strainer blow valve 14 is fully opened, fresh water 18
Is supplied and seawater is replaced with fresh water. To confirm the replacement with fresh water, the conductivity detector 19 is provided in the blow pipe 20, and when the conductivity decreases, it is considered that the replacement of fresh water is completed, and the auto strainer blow valve 14 is fully closed.
【００２５】海水取水ポンプ２を起動し、循環清水の加
温を行い、前記操作と同様の循環清水温度は６０℃以上
で１時間以上保持させた後、海水取水ポンプ２を停止さ
せる。単に、海水を清水に置換するだけでなく、清水置
換後に加温して微生物を死滅（殺菌）させているので、
休止期間中のスカムの発生を防止することができる。The seawater intake pump 2 is started, the circulating fresh water is heated, and the circulating freshwater temperature is maintained at 60 ° C. or higher for at least one hour, and then the seawater intake pump 2 is stopped. Not only simply replacing seawater with fresh water, but also heating (after disposing of fresh water) to kill (kill) microorganisms.
It is possible to prevent the occurrence of scum during the suspension period.
【００２６】なお、上記実施例では外水取水ポンプに海
水取水ポンプ２を用い、外水として海水を取水する場合
を示したが、本発明に係る外水取水熱交換装置の微生物
付着防止方法で用いる外水は海水に限定されるものでは
なく、下水、河川水等でもよいことは当然である。In the above embodiment, the case where the seawater intake pump 2 is used as the outside water intake pump and the seawater is taken as the outside water has been shown. However, the method for preventing microorganisms from adhering to the outside water intake heat exchange apparatus according to the present invention is described. The external water used is not limited to seawater, but may be sewage, river water or the like.
【００２７】[0027]
【発明の効果】請求項１に記載の発明によれば、熱交換
器出口配管から外水取水ポンプの吸込配管をつなぐバイ
パス配管を設けて外水が循環する外水循環経路を形成
し、外水取水ポンプを運転することにより外水循環経路
を循環する外水水温を６０℃以上とするので、循環する
外水水温中の微生物を殆ど死滅させることができるから
下記のような優れた効果が得られる。According to the first aspect of the present invention, an external water circulation path for circulating external water is formed by providing a bypass pipe connecting the heat exchanger outlet pipe to the suction pipe of the external water intake pump. Since the temperature of the external water circulating in the external water circulation path is set to 60 ° C. or higher by operating the water intake pump, the microorganisms in the temperature of the external water circulating can be almost killed, and the following excellent effects can be obtained. .
【００２８】従来のように、高価なオゾン発生装置や
次亜塩素酸発生装置を必要としない安価な外水取水熱交
換装置の微生物付着防止方法を提供できる。As in the prior art, it is possible to provide a method for preventing microorganisms from adhering to an inexpensive external water intake heat exchange apparatus that does not require an expensive ozone generator or hypochlorous acid generator.
【００２９】従来の温水置換による微生物付着防止方
法に比べて、外水を温水化するため、置換清水使用量が
減る。Compared with the conventional method for preventing the adhesion of microorganisms by hot water replacement, the amount of replacement fresh water used is reduced because external water is warmed.
【００３０】熱供給プラントと外水取水熱交換器との
距離が離れている場合、加熱源に外水取水ポンプ（例え
ば海水取水ポンプ）を使用するため、温水配管敷設費用
が節約できる。また、温水ボイラを併設する場合と比較
しても、設備費用が節約できる。When the distance between the heat supply plant and the external water intake heat exchanger is large, an external water intake pump (for example, a seawater intake pump) is used as a heating source, so that the cost of laying hot water piping can be saved. Also, equipment costs can be reduced as compared with the case where a hot water boiler is additionally provided.
【００３１】また、請求項２に記載の発明によれば、循
環外水温度を６０℃以上で外水接触部構成材の許容温度
以内とすることにより、循環する外水水温中の微生物を
殆ど死滅させることができると共に、外水取水ポンプ等
の外水接触構成部材を保護することができる。例えば、
外水取水ポンプにケーシング、羽根車の両方がペンタム
樹脂である片吸込渦巻ポンプを用いてもペンタム樹脂の
許容温度以下とするから、ペンタム樹脂は保護される。According to the second aspect of the present invention, the temperature of the circulating outside water is set to 60 ° C. or higher and within the allowable temperature of the constituent material of the outside water contact portion, thereby almost eliminating microorganisms in the circulating outside water temperature. In addition to being able to be killed, external water contact components such as an external water intake pump can be protected. For example,
Even if the casing and the impeller are single-suction volute pumps in which both the casing and the impeller are made of pentam resin, the temperature is kept below the allowable temperature of pentam resin, so that the pentam resin is protected.
【００３２】また、請求項３に記載の発明によれば、外
水循環経路の外水を清水に置換した後、外水循環経路を
循環する清水を上記温度に昇温させることができるよう
にしたので、中間期、冬季のように長期間、外水取水熱
交換装置を休止する場合においても、スカムの発生を防
止することができる。According to the third aspect of the present invention, after replacing the external water in the external water circulation path with fresh water, the temperature of the fresh water circulating in the external water circulation path can be raised to the above-mentioned temperature. Even in the case where the external water intake heat exchange device is stopped for a long period of time, such as in the middle and winter, the occurrence of scum can be prevented.
【図１】本発明に係る海水取水熱交換器の系統構成を示
す図である。FIG. 1 is a diagram showing a system configuration of a seawater intake heat exchanger according to the present invention.
１ 海水ポンプ吸込水槽 ２ 海水取水ポンプ ３ オートストレーナ ４ 熱交換器 ５ 冷却水ポンプ ６ 冷凍凝縮器 ７ 冷凍吸収器 ８ 海水放流管 ９ 熱交換器海水出口弁 １０ バイパス弁 １１ バイパス配管 １２ 熱交換器冷却水入口弁 １３ 海水温度検出器 １４ オートストレーナブロー弁 １５ 海水ポンプ吸込弁 １６ 清水置換弁 １７ 清水タンク １８ 清水補給水 １９ 導電率検出器 ２０ ブロー配管 DESCRIPTION OF SYMBOLS 1 Seawater pump suction water tank 2 Seawater intake pump 3 Autostrainer 4 Heat exchanger 5 Cooling water pump 6 Refrigeration condenser 7 Refrigeration absorber 8 Seawater discharge pipe 9 Heat exchanger Seawater outlet valve 10 Bypass valve 11 Bypass pipe 12 Heat exchanger cooling Water inlet valve 13 Seawater temperature detector 14 Auto strainer blow valve 15 Seawater pump suction valve 16 Freshwater displacement valve 17 Freshwater tank 18 Freshwater make-up water 19 Conductivity detector 20 Blow pipe
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１２年７月３日（２０００．７．３）[Submission date] July 3, 2000 (2007.3.3)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００２[Correction target item name] 0002
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００２】[0002]
【従来の技術】従来、海水を冷却水として使用する蒸気
タービン復水器では、ブラシやボールにより、熱交換器
細管内のスケールやスカムを機械的に除去する方法が行
われている。冷凍機の冷却源を冷却塔循環水でなく、下
水、河川水、海水に求めるシステムは冷却塔への補給水
が不要になるだけでなく、外気の湿球温度より決められ
た冷却温度よりも低い水温であり、冷凍機の成績係数が
向上することが知られており新エネ促進法では「温度差
エネルギー」と呼ばれる技術として知られている。2. Description of the Related Art Conventionally, in a steam turbine condenser using seawater as cooling water, a method of mechanically removing scale and scum in a heat exchanger thin tube by a brush or a ball has been used. A system that requires the cooling source of the refrigerator to be not circulating water in the cooling tower but sewage, river water, and seawater not only eliminates the need for replenishing water to the cooling tower, but also reduces the cooling temperature determined by the wet-bulb temperature of the outside air. low is the water temperature, in the refrigerator new energy promotion Law grades coefficient have been known to improve is known as a technique referred to as the "temperature difference energy".
Claims (3)
を通して熱交換器に外水を導く外水配管系統を具備し、
該外水と冷却水を熱交換する外水取水熱交換装置の外水
と接触する部分への微生物の付着を防止するための外水
取水熱交換装置の微生物付着防止方法であって、 前記外水配管系統の熱交換器出口配管から前記外水取水
ポンプの吸込配管をつなぐバイパス配管を設けて外水が
循環する外水循環経路を形成し、 前記外水取水ポンプを運転することにより該外水循環経
路を循環する外水水温を６０℃以上に昇温させることを
特徴とする外水取水熱交換装置の微生物付着防止方法。1. An external water piping system for guiding external water to a heat exchanger through an automatic strainer by an external water intake pump,
A method for preventing microorganisms from adhering to an external water intake heat exchange device for preventing adhesion of microorganisms to a portion of the external water intake heat exchange device that exchanges heat with the external water and the cooling water, the method comprising: By providing a bypass pipe connecting the heat exchanger outlet pipe of the water pipe system to the suction pipe of the external water intake pump to form an external water circulation path for circulating external water, and operating the external water intake pump to circulate the external water. A method for preventing microorganisms from adhering to an external water intake heat exchange device, comprising raising the temperature of external water circulating in a path to 60 ° C. or higher.
微生物付着防止方法において、 前記外水循環経路に連通するオートストレーナブロー弁
を設け、該オートストレーナブロー弁により、ブロー水
量を制御することにより循環外水温度を６０℃以上で外
水接触部構成材の許容温度以内とすることを特徴とする
外水取水熱交換装置の微生物付着防止方法。2. The method for preventing microorganisms from adhering to an external water intake heat exchange device according to claim 1, further comprising an automatic strainer blow valve communicating with the external water circulation path, and controlling an amount of blow water by the automatic strainer blow valve. The method for preventing microorganisms from adhering to an external water intake heat exchange device, wherein the temperature of the circulating external water is set to 60 ° C. or higher and within the allowable temperature of the constituent material of the external water contact portion.
装置の微生物付着防止方法において、 前記外水循環経路の外水を清水に置換する清水置換経路
を設け、該外水循環経路の外水を清水に置換した後、前
記外水取水ポンプを運転することにより該外水循環経路
を循環する清水を上記温度以上に昇温させることができ
るようにしたことを特徴とする外水取水熱交換装置の微
生物付着防止方法。3. The method for preventing microorganisms from adhering to an external water intake heat exchange apparatus according to claim 1, wherein a fresh water replacement path for replacing external water in the external water circulation path with fresh water is provided. After replacing the water with fresh water, the external water intake heat exchange characterized in that the external water intake pump is operated to raise the temperature of the fresh water circulating in the external water circulation path to the temperature or more. A method for preventing microorganisms from adhering to the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000199638A JP2002022388A (en) | 2000-06-30 | 2000-06-30 | Microorganism adhesion preventing method for external water intake heat exchange device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000199638A JP2002022388A (en) | 2000-06-30 | 2000-06-30 | Microorganism adhesion preventing method for external water intake heat exchange device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002022388A true JP2002022388A (en) | 2002-01-23 |
Family
ID=18697622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000199638A Pending JP2002022388A (en) | 2000-06-30 | 2000-06-30 | Microorganism adhesion preventing method for external water intake heat exchange device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002022388A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014069097A (en) * | 2012-09-27 | 2014-04-21 | Chubu Electric Power Co Inc | Method for removing marine organisms from heat exchanger |
| JP2019178954A (en) * | 2018-03-30 | 2019-10-17 | 日立Ｇｅニュークリア・エナジー株式会社 | Seawater cooling system |
-
2000
- 2000-06-30 JP JP2000199638A patent/JP2002022388A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014069097A (en) * | 2012-09-27 | 2014-04-21 | Chubu Electric Power Co Inc | Method for removing marine organisms from heat exchanger |
| JP2019178954A (en) * | 2018-03-30 | 2019-10-17 | 日立Ｇｅニュークリア・エナジー株式会社 | Seawater cooling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2007533440A (en) | Sterilization system | |
| EP3306247A1 (en) | Air-water heat exchanger structure and method for controlling and enhancing the operation thereof | |
| CN209470582U (en) | A kind of instant heating type plate heat exchanger unit of steam-water | |
| JP2002022388A (en) | Microorganism adhesion preventing method for external water intake heat exchange device | |
| CN212511086U (en) | Novel waste heat utilization system of fixed-row flash tank | |
| KR100520815B1 (en) | Heat pump device for sea water | |
| CN210568905U (en) | Multiple energy-saving dehumidifying device | |
| CN112094031A (en) | A heat recovery type high-efficiency heat pump system and control method thereof | |
| CN118791174A (en) | Water treatment ion cleaning device and method | |
| CN117509789A (en) | High-hardness high-salinity high-organic matter liquid evaporation system | |
| JP3640410B2 (en) | Power generation and desalination equipment using seawater temperature difference | |
| CN211060213U (en) | Heating system directly using condenser of indirect air cooling unit as heating network heater | |
| CN208883648U (en) | A thermal power plant circulating water treatment system | |
| CN222348718U (en) | Purified water distribution storage system | |
| JP3973002B2 (en) | Fluid heat sterilizer | |
| CN207849519U (en) | A kind of domestic hot-water shares heat pump heat distribution system with air conditioning and heating | |
| CN221685259U (en) | A heat recovery device for MVR evaporative condenser | |
| RU2300050C1 (en) | Vacuum deairing machine | |
| CN222476244U (en) | Device for evaporating high-salt organic wastewater by utilizing water source heat pump to recover waste heat | |
| CN222279485U (en) | Anticorrosion structure of heat exchanger of power plant | |
| CN203534239U (en) | Plate-type evaporation air cooling condenser system with medicine adding device | |
| US11891317B2 (en) | Heating system | |
| CN222824670U (en) | Circulation cooling device | |
| CN214173067U (en) | Water inlet system of drain tank | |
| JP3754518B2 (en) | Marine turbine removal equipment for steam turbine plants |