JP2014061483A - Intermediate pressure outer irradiation type ultraviolet lamp and microorganism inactivation device for ballast water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microorganism inactivation device for ballast water satisfying the conditions of the internal pressure proof stress and heat resistant temperature of a water passage tube made of a fluororesin using a medium pressure mercury lamp.SOLUTION: The internal pressure outer irradiation type ultraviolet lamp comprises: a cylindrical barrel part 2; a pair of cylindrical header parts 3, 4 provided at both the edges of the barrel part; a lamp protective sleeve 16 arranged at the cylindrical shaft in the barrel part and provided projectingly to the outside from the respective header parts 3, 4; an intermediate pressure mercury lamp 15 stored in the lamp protective sleeve 16; a plurality of water passing tubes 18 made of fluororesin arranged around the shaft of the lamp protective sleeve 16, opened, respectively, to the respective header parts, and through which ballast water is circulated; and a cooling liquid circulation apparatus 30 in which ballast water is made to flow from either header part, the ballast water is exhausted from the other header part, and pure water is circulated from a pure water inlet nozzle 22 at one end side of the barrel part 2 toward a pure water outlet nozzle 22 at the other end side, and the pressure of the pure water is controlled so as to be set lower than the pressure of the ballast water to satisfy the conditions of the internal pressure proof stress and heat resistant temperature of the water passing tube.

Description

  The present invention relates to a medium pressure external irradiation type ultraviolet irradiation device, and more particularly to a medium pressure external irradiation type ultraviolet irradiation device suitable for inactivating microorganisms in ballast water.

  Usually, a ship is loaded with ballast water such as seawater in a ballast tank or the like in order to deepen the draft and stabilize the ship even when the load is small. Such ballast water is loaded with ballast water when the cargo is unloaded at the port of call and when leaving the port. ing. When ballast water is discarded in a port or the like, the ballast water is purified and discarded. Recently, it has been requested to inactivate or kill microorganisms and viruses in the ballast water.

  There are several methods for inactivating microorganisms and viruses in ballast water, but it is conceivable to inactivate microorganisms by irradiating ultraviolet rays to the ballast water to be discarded. However, the treatment of ballast water is required to treat a large amount of ballast water (for example, 500 to 1000 tons / h or more) in a relatively short time in order to shorten the berthing time. For this reason, when processing by ultraviolet irradiation, if a low-pressure mercury lamp that has been conventionally used as an ultraviolet lamp is used, there are practical problems such as a large ultraviolet irradiation device due to low processing capability.

  Therefore, it is conceivable to use a medium pressure mercury lamp described in Non-Patent Document 1 as an ultraviolet lamp. According to this document, as shown in Table 1, the medium pressure mercury lamp has an electric input per emission length (corresponding to ultraviolet light output) in the range of 50 to 250 W / cm, and the electric input of the low pressure mercury lamp is 0. Much larger than 5-10 W / cm. Therefore, by using a medium-pressure mercury lamp having a high processing capacity, the number of ultraviolet lamps can be greatly reduced and the apparatus can be downsized.

UV Disinfection Guidance Manual For the Final LT2ESWTR, US EPA, November 2006, P (2-17), Table2.1

  However, since the medium pressure mercury lamp generates a large amount of heat, various problems can be considered, and appropriate measures are required. For example, if a medium-pressure mercury lamp is housed in a protection sleeve made of quartz glass and placed in a flow path of ballast water, which is the liquid to be treated, and the so-called internal illumination system that irradiates ultraviolet light onto the ballast water, There is a problem that microorganisms and impurities in the ballast water adhere to the outer surface of the protective sleeve that becomes high temperature, and the transmittance of ultraviolet rays decreases in a short time. Therefore, an ultraviolet irradiation device for ballast water has a plurality of water pipes that circulate ballast water arranged at equal distances around the axis of a medium-pressure mercury lamp housed in a protective sleeve, and ultraviolet rays from the outer periphery of the water pipe. The so-called external illumination type is preferable.

In addition, since ballast water generally has a high pressure (for example, about 3 kg / cm ² ), a quartz glass tube having a low tensile strength is easily damaged by an internal pressure, and therefore is not suitable for a water pipe through which ballast water is circulated. Therefore, it is preferable to use a fluororesin water pipe that has a relatively high internal pressure proof stress and is difficult to get dirty.

  However, in the case of fluororesin water pipes, if the pipe thickness is reduced in order to ensure high UV transmittance, the internal pressure proof strength will decrease. May cause the water pipe to vibrate, and the vibration may damage the water pipe. In addition, since the medium pressure mercury lamp has a large calorific value and may reach an operating temperature of 600 to 900 ° C., when using a fluororesin water pipe with low heat resistance, ultraviolet rays are radiated even if ballast water is circulated. There is a possibility that the surface temperature of the irradiated water pipe exceeds the heat resistant temperature of the fluororesin (for example, 200 ° C.).

  The problem to be solved by the present invention is an intermediate-pressure externally irradiated ultraviolet irradiation device that uses a medium-pressure mercury lamp with high processing capacity and that can satisfy the conditions of the internal pressure proof strength and heat-resistant temperature of a fluororesin water pipe and The object is to provide a microbial inactivation apparatus for ballast water.

  In order to solve the above-described problems, an intermediate-pressure externally irradiated ultraviolet irradiation device of the present invention includes a cylindrical body, a pair of cylindrical headers connected to both ends of the body through flanges, respectively. An ultraviolet ray transmissive lamp protection sleeve disposed on the cylindrical shaft of the body portion and projecting from the header portions through the flanges, and an intermediate pressure mercury lamp accommodated in the lamp protection sleeve A plurality of fluororesin water pipes that are disposed around the axis of the lamp protection sleeve and that pass through the flanges and that are opened in the header parts, respectively, and the pair of header parts. It is characterized by comprising an inlet nozzle and an outlet nozzle for the liquid to be treated provided, and an inlet nozzle and an outlet nozzle for a cooling liquid provided at both ends of the body portion.

  In this way, a fluororesin water pipe is arranged around the axis of the lamp protection sleeve in which the medium pressure mercury lamp is accommodated, and the coolant is circulated between the lamp protection sleeve and the water pipe in the trunk portion. Therefore, by adjusting the flow rate and temperature of the coolant, the temperature of the water pipe can be easily suppressed to the heat resistant temperature of the fluororesin or lower. As a result, a medium pressure mercury lamp with a large power input (and consequently ultraviolet output) can be applied, so that the processing ability by ultraviolet rays can be increased.

  In addition, since the cooling liquid is circulated on the outer surface of the water pipe, the force applied to the pipe wall of the water pipe becomes a differential pressure between the pressure of the cooling liquid and the liquid to be treated circulated through the water pipe. Therefore, the internal pressure applied to the fluororesin water conduit can be reduced by keeping the pressure of the coolant lower than the pressure of the liquid to be treated according to the internal pressure resistance of the water conduit. As a result, the thickness of the fluororesin water pipe can be reduced to, for example, about 1 to 3 mm. Therefore, the amount of ultraviolet rays absorbed in the pipe wall is reduced, that is, the ultraviolet ray transmittance is increased, and the liquid to be treated is irradiated. The amount of ultraviolet irradiation can be increased. Thereby, the irradiation efficiency of ultraviolet rays improves and the apparatus can be miniaturized.

  Moreover, it is preferable to provide an ultraviolet reflecting member on the inner surface of the body portion. According to this, it is possible to irradiate the liquid to be treated inside the water pipe by reflecting the ultraviolet rays that pass through the plurality of water pipes or pass through the inside of the water pipe and reach the inner surface of the trunk. Therefore, it is possible to improve the irradiation efficiency of the ultraviolet rays onto the liquid to be treated.

  Further, it is preferable to use pure water having a high ultraviolet transmittance as the coolant. In this case, it is possible to provide a cooling liquid circulation device that circulates pure water from the inlet nozzle of the cooling liquid through the lamp protection sleeve and the body around the water pipe, and extracts and circulates the pure water from the outlet nozzle of the cooling liquid. This cooling liquid circulation device supplies a pure water tank and pure water in the pure water tank to a cooling liquid inlet nozzle, and returns the pure water flowing out from the cooling liquid outlet nozzle to the pure water tank. A heat exchanger that cools circulating pure water with a refrigerant (for example, seawater), a pressure control valve that controls the pressure of pure water supplied to the coolant inlet nozzle, and pure water that flows out of the coolant outlet nozzle A temperature sensor that detects the temperature of the liquid and a flow rate that controls the flow rate of pure water supplied to the coolant inlet nozzle and adjusts the temperature of pure water flowing out of the coolant outlet nozzle detected by the temperature sensor to a set range. A control valve can be provided. According to this, the temperature of the fluororesin water pipe can be reliably maintained below the heat resistant temperature of the fluororesin.

The cooling liquid circulation device includes a pressure sensor that detects the pressure of the processing target liquid supplied to the inlet nozzle of the processing target liquid, and the pressure control valve includes a differential pressure between the pressure of the processing target liquid and the pressure of pure water. Is maintained at a set pressure (for example, 1 kg / cm ² ), the supply pressure of pure water is preferably controlled to a low pressure. According to this, the internal pressure which acts on the pipe wall of a water flow pipe can be reliably suppressed below an allowable pressure (internal pressure proof stress). In addition, it is preferable that the coolant circulating device issues an alarm when the temperature of pure water flowing out from the coolant outlet nozzle exceeds a preset upper limit value. Further, it is preferable to issue an alarm even when the differential pressure between the pressure of the liquid to be treated and the pressure of pure water supplied to the coolant inlet nozzle exceeds a preset upper limit value.

  By using the medium-pressure externally irradiated ultraviolet irradiation device of the present invention as the treatment target liquid as ballast water, a microbial inactivation device for ballast water can be provided. In this case, since the outer surface of the lamp protection sleeve is in contact with a coolant such as pure water, it is difficult for dirt to adhere to it, so that a mechanical cleaning device such as a scraper that scrapes off the dirt on the surface is unnecessary. The same applies to the outer surface of the water pipe. On the other hand, since the ballast water of seawater circulates on the inner surface of the water pipe, there is a possibility that dead bodies of microorganisms and impurities in the ballast water may adhere, but during normal navigation where microbial inactivation treatment is not performed, If necessary, a cleaning liquid such as citric acid can be passed through the water pipe and removed. As described above, the medium pressure external irradiation type ultraviolet irradiation device of the present invention does not need to be equipped with a mechanical cleaning device that is damaged by the vibration or vibration of the ship, and is installed in the piping system for discarding the ballast water of the ship. can do.

  ADVANTAGE OF THE INVENTION According to this invention, the medium pressure external irradiation type ultraviolet irradiation device and the ballast water microbe which can use the medium pressure mercury lamp with a high processing capacity and can satisfy the conditions of the internal pressure proof stress and the heat resistant temperature of the water pipe made of fluororesin An inactivation device can be provided.

1 is a cross-sectional view of an intermediate-pressure externally irradiated ultraviolet irradiation device according to an embodiment of the present invention. It is the arrow line view seen from arrow II-II of FIG. It is a system configuration | structure figure of one Example of the microorganisms inactivation apparatus of the ballast water of this invention to which the medium pressure external irradiation type ultraviolet irradiation device of FIG. 1 is applied.

  Hereinafter, the present invention will be described based on an example of a microorganism inactivating apparatus for ballast water to which an intermediate-pressure external irradiation type ultraviolet irradiation apparatus of the present invention is applied. The present invention is not limited to a microbial inactivation apparatus for ballast water, uses a medium-pressure mercury lamp with a high treatment capacity, and satisfies the conditions of the internal pressure proof stress and heat resistance temperature of a water pipe made of fluororesin, Needless to say, the present invention can be applied to a medium-pressure externally irradiated ultraviolet irradiation device that inactivates or kills microorganisms or the like of the liquid to be treated.

  As shown in FIGS. 1 and 2, the microbial inactivation apparatus 1 of this embodiment includes a cylindrical body 2 constituting an ultraviolet irradiation unit, and a cylindrical body connected to both ends of the body 2. A pair of header portions 3 and 4 are provided. The flanges 5 and 6 fixed to both ends of the body portion 2 are connected to each other at one end of the header portions 3 and 4 by bolts (not shown) via the flanges 7 and 9, respectively. The flanges 11 and 12 are fixed to the flanges 8 and 10 at the other ends of the header portions 3 and 4 by bolts (not shown). In this embodiment, the body 2, the headers 3, 4, and the flanges are formed of a vinyl chloride material having corrosion resistance against seawater since it handles ballast water. However, the present invention is not limited to this, and although it is slightly inferior to seawater than vinyl chloride material, a stainless steel (SUS) material can be used.

  An intermediate pressure mercury lamp 15 is disposed on the central axis of the cylinder of the body 2, and the intermediate pressure mercury lamp 15 is accommodated in a lamp protection sleeve 16 formed of an ultraviolet transmitting material. The lamp protection sleeve 16 is inserted into the through holes formed in the flanges 5 and 6 and the flanges 7 and 9 in a watertight manner through a seal member (not shown). Both ends of the lamp protection sleeve 16 are watertightly held in through holes formed in the flanges 8 and 10 and the flanges 11 and 12 of the pair of header portions 3 and 4 via seal members (not shown). Further, both ends of the lamp protection sleeve 16 project outward and are opened, and are fixed to the flanges 11 and 12 by ring members 17, respectively. The medium pressure mercury lamp 15 is supplied with electric power from the power cable 13 through a base 15a provided at one end.

  A plurality (four in the illustrated example) of water pipes 18 through which ballast water is circulated around the axis of the lamp protection sleeve 16 are arranged. The water pipe 18 is arranged at an equidistant position with respect to the medium pressure mercury lamp 15, and both ends of each water pipe 18 pass through the through holes formed in the flanges 5, 6 and the flanges 7, 9, respectively, and the header portion 3. , 4 are opened inside. Further, both ends of each water pipe 18 are supported in a watertight manner through through-holes formed in the flanges 5, 6, 7, 9 through seal members (not shown) and fixed by ring members 19. The water conduit 18 may be formed using a fluororesin, for example, FEP (tetrafluoroethylene / hexafluoropropylene copolymer resin), PFA (tetrafluoroethylene), PTFE (polytetrafluoroethylene), or the like. it can.

  The cylindrical wall of the header part 3 is provided with an inlet nozzle 20 for supplying ballast water, and the cylindrical wall of the header part 4 is provided with an outlet nozzle 21 for discharging ballast water. Further, pure water inlet nozzles 22 and outlet nozzles 23 through which pure water as a coolant flows are provided on the cylindrical walls at both ends of the body 2.

  An ultraviolet reflecting member 24 is provided on the inner peripheral surface of the body portion 2. The reflecting member 24 is formed by coating the surface of an aluminum material with a fluororesin to form a reflecting surface, and coating the back surface with an inorganic material and sticking it to the inner peripheral surface of the body 2. In addition, when the inner surface of the flanges 5 and 6 of the trunk portion 2, the inner peripheral surface of the header portions 3 and 4, and the inner surfaces of the flanges 7, 8, 9, and 10 are irradiated with ultraviolet rays, the vinyl chloride material may be deteriorated. There is. Therefore, it is preferable to coat a reflecting member that reflects ultraviolet rays as necessary. Further, an ultraviolet intensity sensor 25 protected by a quartz glass tube is provided in the middle of the body part 2 so as to face the inside of the body part 2, and the representative or average ultraviolet intensity of the medium pressure mercury lamp 15 is measured. It is made possible. A drain valve 26 is provided in communication with the middle bottom of the body 2.

  In FIG. 3, the system block diagram of the microorganisms inactivation apparatus of the ballast water using the Example of FIG. 1 is shown. The cooling liquid circulation device 30 includes a pure water tank 31 that stores pure water as a cooling liquid, a cooling liquid circulation pump 32 that sucks pure water in the pure water tank 31 and supplies the pure water to the pure water inlet nozzle 22, A coolant circulation line that returns pure water flowing from the water inlet nozzle 22 and flowing through the body 2 around the lamp protection sleeve 16 and the water pipe 18 and flowing out from the pure water outlet nozzle 23 to the pure water tank 31. 33 is comprised. The pure water tank 31 is provided with a heat exchanger 34 that cools pure water in the tank with seawater as a refrigerant.

The coolant circulation pipe 33 includes a pressure control valve 35 that controls the pressure of pure water supplied to the pure water inlet nozzle 22, and a flow rate control valve that controls the flow rate of pure water supplied to the pure water inlet nozzle 22. 36, a temperature sensor 37 that detects an outlet temperature To of pure water flowing out from the pure water outlet nozzle 23, a pressure sensor 38 that detects a ballast water pressure P _B supplied to the inlet nozzle 20 of ballast water, A cooling control device 39 is provided. The cooling control device 39 controls the opening degree of the flow control valve 36 so as to adjust the outlet temperature To of pure water detected by the temperature sensor 37 to a preset temperature range. The cooling control unit 39 controls the pressure control valve 35 on the basis of the ballast water pressure P _B detected by the pressure sensor 38, the pure water pressure P _C and ballast water pressure supplied to the inlet nozzle 22 of the pure water differential pressure ΔP ₌ (P B -Pc) the set differential pressure P _B (e.g., ΔP = 1kg / cm ²⁾ is adapted to control the. A predetermined amount of seawater is circulated in the heat exchanger 34 by a seawater pump (not shown). In the present embodiment, the heat exchanger 34 in which the heat transfer pipe is arranged in the pure water tank 31 is shown. However, the heat exchanger 34 is not limited to this, and the coolant circulation pipe 33 on the discharge side of the coolant circulation pump 32 is used. A heat exchanger may be provided.

Operation | movement of the microorganisms inactivation apparatus of the ballast water of a present Example comprised in this way is demonstrated. First, before circulating the ballast water through the water pipe 18, the coolant circulation pump 32 is activated to circulate pure water to the trunk portion 2. At this time, the water pipe 18 is empty, the preparing activated so as not to collapse, the pure water pressure P _C previously distributed and held in sufficiently low pressure. Next, the ultraviolet lamp power supply 40 is activated and the medium pressure mercury lamp 15 is turned on so that the ballast water can be inactivated. On the other hand, ballast water pumped from a ballast tank (not shown) by a ballast water pump is subjected to chemical and / or physical water purification treatment (not shown). The purified ballast water flows into the ballast water inlet nozzle 20 by opening the original valve 41 of the ballast water. Ballast water that has flowed into the inlet nozzle 20 is diverted to a plurality of water pipes 18 in the header section 3, and ultraviolet rays are irradiated from the medium pressure mercury lamp 15 in the course of flowing through the water pipes 18. The irradiation of the ultraviolet rays inactivates or kills microorganisms, fungi or viruses in the ballast water, and the treated ballast water is discharged from the ballast water outlet nozzle 21 through the pipe line via the header portion 4. Thereafter, the flow rate of the ballast water is increased to a predetermined amount, and the pressure and temperature of pure water are adjusted by the cooling control device 39 in accordance with this, and the steady state is entered.

In the steady operation state, the flow rate of the ballast water flowing in through the original valve 41 is kept substantially constant by a ballast water pump and a flow rate control valve (not shown). Further, the ballast water pressure P _B flowing into the ballast water inlet nozzle 20 is kept substantially constant (for example, 3 kg / cm ² ). Based on this, the diameter and pressure loss of the water pipe 18 so that the flow rate of the ballast water in the water pipe 18 is substantially constant (for example, 2 to 4 m / sec, preferably 2 to 3 m / sec). Is set. On the other hand, the cooling control device 39 controls the pressure control valve 35 to control the pure water pressure Pc to a value lower than the ballast water pressure P _B by a set differential pressure ΔP. As a result, the differential pressure ΔP inside and outside the pipe wall of the water pipe 18 is maintained below the internal pressure resistance of the water pipe 15 made of fluororesin, so that the water pipe 18 can be protected from damage due to the ballast water pressure.

  On the other hand, the medium pressure mercury lamp 15 emits ultraviolet rays and becomes high temperature, and the lamp protection sleeve 16 and the water pipe 18 are irradiated with ultraviolet rays and the temperature rises. In this regard, according to the present embodiment, the pure water as the coolant from the coolant circulation pump 32 is circulated from the inlet nozzle 22 through the body 2 toward the outlet nozzle 23, so that the lamp protection sleeve 16, In particular, the temperature rise of the water pipe 18 can be suppressed. Pure water discharged from the outlet nozzle 23 is returned to the pure water tank 31 where it is cooled by seawater via the heat exchanger 34. At this time, the cooling control device 39 takes in the outlet temperature To of the pure water detected by the temperature sensor 37 and controls the opening degree of the flow control valve 36 so that the outlet temperature To falls within the set temperature range. Thereby, the deterioration by the temperature rise of the fluororesin water pipe 18 can be suppressed.

  As described above, according to the present embodiment, the fluororesin water pipe 18 is arranged around the axis of the lamp protection sleeve 16 in which the medium pressure mercury lamp 15 is accommodated, and the lamp of the trunk portion 2 is disposed. Since pure water as a coolant was circulated between the protective sleeve 16 and the water pipe 18, the temperature of the water pipe 18 can be easily kept below the heat resistant temperature of the fluororesin by adjusting the flow rate and temperature of the pure water. be able to. As a result, the medium pressure mercury lamp 15 having a large power input (and consequently ultraviolet output) can be applied, so that the processing capability by ultraviolet rays can be increased.

Moreover, since pure water is circulated on the outer surface of the water pipe 18, the force applied to the pipe wall of the water pipe 18 is the difference between the pressure of pure water and the pressure of the ballast water circulated through the water pipe 18. By keeping the pressure of pure water at a constant pressure (for example, 1 kg / cm ² ) lower than the pressure of ballast water according to the internal pressure resistance of the water pipe 18, the internal pressure applied to the fluororesin water pipe 18 is relieved. can do. As a result, the thickness of the fluororesin water pipe 18 can be reduced to, for example, about 1 to 3 mm. Therefore, the amount of ultraviolet rays absorbed in the pipe wall is reduced, that is, the ultraviolet ray transmittance is increased and the ballast water is irradiated. The amount of ultraviolet irradiation can be increased. Thereby, the irradiation efficiency of ultraviolet rays improves and the apparatus can be miniaturized.

  In addition, since an ultraviolet reflecting member is provided on the inner surface of the trunk portion 2, the ultraviolet rays that reach the inner surface of the trunk portion 2 through the water pipes 18 or through the water pipes 18 are provided. Can be reflected to irradiate the ballast water inside the water pipe 18, and the efficiency of irradiating the ballast water with ultraviolet rays can be improved.

In addition, since pure water is used as the cooling liquid, the absorption of ultraviolet rays by the cooling liquid can be reduced and the transmittance can be kept high. The cooling liquid circulation device includes a pressure sensor that detects the pressure of the processing target liquid supplied to the processing target liquid inlet nozzle, and the pressure control valve sets a differential pressure between the pressure of the processing target liquid and the pressure of pure water. It is preferable to control the supply pressure of pure water to a low pressure so as to keep the pressure (for example, 1 kg / cm ² ). According to this, the internal pressure which acts on the pipe wall of a water flow pipe can be reliably suppressed below an allowable pressure.

  In addition, it is preferable that the coolant circulating device 30 issues an alarm when the temperature of pure water flowing out from the pure water outlet nozzle 23 exceeds a preset upper limit value. Further, it is preferable to issue an alarm even when the differential pressure between the pressure of the ballast water and the pressure of pure water supplied to the pure water inlet nozzle exceeds a preset upper limit value.

  Further, according to the microbial inactivation apparatus of the ballast water of this embodiment, since the outer surface of the lamp protection sleeve 16 is in contact with pure water, it is difficult for dirt to adhere to it. No mechanical cleaning device is required. The same applies to the outer surface of the water pipe 18. Therefore, according to the present embodiment, since it is not necessary to provide a mechanical cleaning device that is damaged by the shaking or vibration of the ship, it can be installed in a piping system that discards the ballast water of the ship.

  On the other hand, since the ballast water of seawater circulates in the inner surface of the water conduit 18, there is a possibility that dead bodies of microorganisms and impurities in the ballast water may adhere. Depending on the situation, a cleaning liquid such as citric acid can be passed through the water pipe and removed.

  As mentioned above, although this invention was demonstrated based on the Example of the microorganisms inactivation apparatus of ballast water, this invention is not restricted to the microorganisms inactivation of ballast water, It uses the medium pressure mercury lamp with high processing capacity, and Since the conditions of the internal pressure proof stress and the heat-resistant temperature of the fluororesin water pipe can be satisfied, the present invention can be applied to an intermediate pressure external irradiation type ultraviolet irradiation device that irradiates various treatment target liquids with ultraviolet rays.

DESCRIPTION OF SYMBOLS 1 Medium pressure external irradiation type ultraviolet irradiation device 2 Body part 3, 4 Header part 15 Medium pressure mercury lamp 16 Lamp protection sleeve 18 Water pipe 20 (Ballast water) Inlet nozzle 21 (Ballast water) Outlet nozzle 22 (Pure water) ) Inlet nozzle 23 (Pure water) Outlet nozzle 30 Coolant circulation device 31 Pure water tank 32 Coolant circulation pump 33 Coolant circulation line 34 Heat exchanger 35 Pressure control valve 36 Flow control valve 37 Temperature sensor 38 Pressure sensor

Claims (5)

  A cylindrical barrel, a pair of cylindrical headers connected to both ends of the barrel via flanges, and a cylindrical shaft of the barrel that passes through the flange from each header. An ultraviolet ray transmissive lamp protection sleeve provided to protrude to the outside, an intermediate pressure mercury lamp accommodated in the lamp protection sleeve, and each header disposed around the axis of the lamp protection sleeve and passing through the flange A plurality of fluororesin water pipes through which the liquid to be treated that is opened in the respective parts circulates, an inlet nozzle and an outlet nozzle for the liquid to be treated provided in the pair of header parts, and both ends of the body part A medium pressure external irradiation type ultraviolet irradiation device comprising an inlet nozzle and an outlet nozzle for a cooling liquid provided in the apparatus. In the medium pressure external irradiation type ultraviolet irradiation device according to claim 1,
The body portion is provided with an ultraviolet reflection member on the inner surface, and the medium pressure external irradiation type ultraviolet irradiation device. In the medium pressure external irradiation type ultraviolet irradiation device according to claim 1,
An intermediate pressure external irradiation type ultraviolet irradiation device, wherein the water pipe has a wall thickness of 1 to 3 mm. A cylindrical barrel, a pair of cylindrical headers connected to both ends of the barrel via flanges, and a cylindrical shaft of the barrel that passes through the flange from each header. An ultraviolet ray transmissive lamp protection sleeve provided to protrude to the outside, an intermediate pressure mercury lamp accommodated in the lamp protection sleeve, and each header disposed around the axis of the lamp protection sleeve and passing through the flange A plurality of fluororesin water flow pipes that are opened in the respective parts and through which the ballast water of seawater circulates, the ballast water inlet and outlet nozzles provided in the pair of header parts, and both ends of the trunk part Provided pure water inlet nozzle and outlet nozzle;
A coolant circulating device that circulates pure water from the pure water inlet nozzle through the lamp protection sleeve and the body around the ballast water conduit, and circulates by extracting from the pure water outlet nozzle;
The cooling liquid circulation device supplies a pure water tank and pure water in the pure water tank to the pure water inlet nozzle, and returns pure water flowing out from the pure water outlet nozzle to the pure water tank. A coolant circulation pump, a heat exchanger that cools the pure water with a refrigerant, a pressure control valve that controls the pressure of pure water supplied to the pure water inlet nozzle, and the pure water outlet nozzle A temperature sensor that detects the temperature of pure water and a flow rate control valve that controls the flow rate of pure water supplied to the pure water inlet nozzle and adjusts the temperature of pure water detected by the temperature sensor to a set range. A microbial inactivation apparatus for ballast water. In the microbial inactivation apparatus of the ballast water of Claim 4,
The cooling liquid circulation device includes a pressure sensor that detects a pressure of the ballast water supplied to the ballast water inlet nozzle, and the pressure control valve is located at the pure water inlet nozzle rather than the pressure of the ballast water. A microbial inactivation apparatus for ballast water, wherein the pressure of pure water to be supplied is controlled to a pressure lower than a set pressure.

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