JP2005342552A - Treating method for marine life such as jellyfish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treating method for a marine life such as a jellyfish by which scrapping treatment cost can be reduced by reducing volume of the marine life such as the jellyfish and further growth of malodor can be suppressed. <P>SOLUTION: The treating method for the marine life comprises a process of freezing the recovered jellyfish, or the like, by using heat of vaporization of liquefied fuel used for power generation and a process of performing vacuum freeze drying of the frozen jellyfish, or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for treating marine organisms such as jellyfish that have flowed into a seawater intake line.

  Seawater is used as cooling water because the condenser of the thermal power plant near the coast requires a large amount of cooling water. A large amount of floating marine organisms such as jellyfish and seaweed rush to the intake channel (intake line) for intake of seawater. If these jellyfish, etc. are left unattended, they may cause various obstacles such as piping blockage, reduction in seawater intake, cooling efficiency, etc .. Usually, it is processed as a product.

  As a treatment method for such industrial waste, treatment by landfill, incineration, fermentation, etc. is common, but the jellyfish component consists of about 95% moisture, about 5% organic matter such as protein, and a large amount Since seawater is mixed in, it is difficult to pick up and the disposal cost increases. In addition, especially in summer, the generation of odors such as rot of fish becomes a problem due to the large amount of jellyfish.

As a method for treating the collected jellyfish and the like, the jellyfish and the like are crushed into suspension water, the suspension water is coagulated and precipitated (Patent Document 1), the jellyfish and the like are crushed and dehydrated, and the dehydrated filtrate is oxidized. A method of purifying by this method (Patent Document 2) is known.
JP-A-4-48986 No. 1-31343

  On the other hand, the present invention reduces the waste disposal cost by reducing the volume of jellyfish and the like by a novel and novel method different from these conventional methods, and suppresses the generation of bad odor.

  The method for treating marine organisms such as jellyfish according to the present invention includes both a gas turbine using a combustion gas of liquefied fuel as a working medium, and a steam turbine using steam obtained by heat exchange with the combustion gas as a working medium. A method for treating marine organisms such as jellyfish that flow into a water intake line when water is taken in as a cooling water for cooling steam in a thermal power plant that generates power by a generator. And the like using the heat of vaporization of the liquefied fuel, and a step of vacuum freeze-drying the frozen jellyfish and the like.

  Such a power plant vaporizes and burns the liquefied fuel, guides the combustion gas as a working medium to the gas turbine, and converts water into steam by heat exchange with the combustion gas, and guides the steam as a working medium to the steam turbine. Thus, the system configuration is such that both the gas turbine and the steam turbine rotate to generate power with the generator. Such a power plant uses seawater as cooling water in order to cool the steam after turning the steam turbine, so that jellyfish and the like flow into the intake line. Therefore, the present invention is to freeze the recovered jellyfish using the heat of vaporization of the liquefied fuel, and vacuum freeze-dry the frozen jellyfish.

  Further, a method for treating marine organisms such as jellyfish according to another invention is a thermal power generation in which power is generated by a generator by operating a steam turbine using steam obtained by heat exchange with combustion gas of liquefied fuel as a working medium. Is a method for treating marine organisms such as jellyfish that flow into a water intake line when taking seawater as cooling water for cooling steam, and the recovered jellyfish is frozen using the heat of vaporization of liquefied fuel. And a step of vacuum freeze-drying the frozen jellyfish and the like.

  Such a power plant vaporizes and burns liquefied fuel, converts water into steam by heat exchange with the combustion gas, and guides this steam to the steam turbine as a working medium, thereby turning the steam turbine to generate power with the generator. It is a system configuration to be performed. Such a power plant uses seawater as cooling water in order to cool the steam after turning the steam turbine, so that jellyfish and the like flow into the intake line. Therefore, the present invention is to freeze the recovered jellyfish using the heat of vaporization of the liquefied fuel and vacuum freeze-dry the frozen jellyfish.

  As described above, the method for treating marine organisms such as jellyfishes according to the present invention can reduce the volume by removing the water occupying most of the components such as jellyfishes by vacuum freeze-drying. Processing costs can be reduced. Moreover, since the moisture of jellyfish etc. is dried, generation | occurrence | production of malodor can also be suppressed.

<First embodiment>
First, the system configuration of a power plant in which the method for treating marine organisms such as jellyfishes according to the first embodiment will be described with reference to FIG.

  LNG (liquefied natural gas) as liquefied fuel is stored in the storage tank 1, sent from there through the supply line 2 to the combustor 3 and combusted, and the combustion gas is guided to the gas turbine 4. And when the gas turbine 4 rotates, the generator 5 will rotate and electric power generation will be performed.

  The combustion gas is exhausted from the chimney 7 through the exhaust duct 6. An evaporator 8 is disposed in the exhaust duct 6, and the water in the evaporator 8 exchanges heat with the combustion gas. As a result, steam is generated and the steam is guided to the steam turbine 9. Then, when the steam turbine 9 rotates, the generator 5 rotates at a higher speed in combination with the rotation of the gas turbine 4, and the power generation efficiency is increased.

  The steam after turning the steam turbine 9 is cooled by the seawater taken from the water intake 10 in the sea by the circulation pump 11 and supplied into the condenser 12, and returns to the water. Then, the water in the condenser 12 is supplied to the evaporator 8 by the feed water pump 13, where it is converted into steam and led again to the steam turbine 9, and after turning the steam turbine 9, the water enters the condenser 12. Follow the return circuit. On the other hand, the seawater that has cooled the steam is discharged from the discharge port 14 into the sea after heat exchange with the water in the condenser 12.

  A processing tank 16 is connected to the LNG supply line 2 via a heat exchanger 15, and the inside of the processing tank 16 can be cooled using the heat of vaporization of LNG in the supply line 2. Further, a vacuum pump 17 is connected to the processing tank 16 so that the processing tank 16 can be evacuated.

  The system configuration of the power plant according to the first embodiment is as described above. Next, a jellyfish processing method will be described.

  First, the jellyfish that has flowed into the water intake line is collected, and the collected jellyfish is put into the treatment tank 16. At this time, the valve 18 on the vacuum pump 17 side is closed. Then, since the inside of the processing tank 16 is cooled by the heat of vaporization of LNG, the jellyfish thrown into a frozen state when a predetermined time elapses. In addition, the collection method of a jellyfish is well-known and omits reference.

  In this state, the valve 18 is opened and the vacuum pump 17 is operated to perform vacuum deaeration in the processing tank 16. When in a vacuum state, the boiling point of water decreases. For example, when the atmospheric pressure in the processing tank 16 is 0.8 Torr, the boiling point is −20 ° C., and when 0.03 Torr, the boiling point is −50 ° C. Since the jellyfish in the processing tank 16 is cooled to below freezing point by freezing, the water of the jellyfish is sublimated from the solid state by freezing and released into the processing tank 16. This reason is vacuum freeze-drying.

  And, by this vacuum freeze-drying, the water occupying most of the components of the jellyfish is removed, and the volume of the jellyfish is reduced. Furthermore, the jellyfish that has finished this treatment is either landfilled or incinerated as industrial waste. Thus, since the volume of the jellyfish is reduced, the disposal cost can be reduced. Moreover, since the jellyfish is in a dry state from which moisture has been removed, the generation of malodor is also suppressed.

<Second embodiment>
First, a system configuration of a power plant in which the method for treating marine organisms such as jellyfishes according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol shall be attached | subjected to the same structure as 1st embodiment, or the structure similar to this.

  LNG as liquefied fuel is stored in the storage tank 1 and sent from there to the boiler 3 ′ via the supply line 2 for combustion, and then exhausted from the chimney 7, but in the boiler 3 ′. The steam pipe 8 ′ is arranged, and the water in the steam pipe 8 ′ is exchanged with the combustion gas to become steam, and the steam is guided to the steam turbine 9. And when the steam turbine 9 rotates, the generator 5 will rotate and electric power generation will be performed.

  The steam after turning the steam turbine 9 is cooled by the seawater taken from the water intake 10 in the sea by the circulation pump 11 and supplied into the condenser 12, and returns to the water. Then, the water in the condenser 12 passes through the steam pipe 8 ′, where it is converted into steam, led again to the steam turbine 9, circulated back to the condenser 12 after turning the steam turbine 9. Follow the path. On the other hand, the seawater that has cooled the steam is discharged from the discharge port 14 into the sea after heat exchange with the water in the condenser 12.

  A processing tank 16 is connected to the LNG supply line 2 via a heat exchanger 15, and the inside of the processing tank 16 can be cooled using the heat of vaporization of LNG in the supply line 2. Further, a vacuum pump 17 is connected to the processing tank 16 so that the processing tank 16 can be evacuated.

  The system configuration of the power plant according to the second embodiment is as described above. Next, a jellyfish processing method will be described.

  First, the jellyfish that has flowed into the water intake line is collected, and the collected jellyfish is put into the treatment tank 16. At this time, the valve 18 on the vacuum pump 17 side is closed. Then, since the inside of the processing tank 16 is cooled by the heat of vaporization of LNG, the jellyfish thrown into a frozen state when a predetermined time elapses. In addition, the collection method of a jellyfish is well-known and omits reference.

  In this state, the valve 18 is opened and the vacuum pump 17 is operated to perform vacuum deaeration in the processing tank 16. When in a vacuum state, the boiling point of water decreases. For example, when the atmospheric pressure in the processing tank 16 is 0.8 Torr, the boiling point is −20 ° C., and when 0.03 Torr, the boiling point is −50 ° C. Since the jellyfish in the processing tank 16 is cooled to below freezing point by freezing, the water of the jellyfish is sublimated from the solid state by freezing and released into the processing tank 16.

  And, by this vacuum freeze-drying, the water occupying most of the components of the jellyfish is removed, and the volume of the jellyfish is reduced. Furthermore, the jellyfish that has finished this treatment is either landfilled or incinerated as industrial waste. Thus, since the volume of the jellyfish is reduced, the disposal cost can be reduced. Moreover, since the jellyfish is in a dry state from which moisture has been removed, the generation of malodor is also suppressed.

  In addition, the processing method of marine organisms, such as a jellyfish based on this invention, is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the above-described embodiment, the process of freezing the recovered jellyfish and the like using the heat of vaporization of the liquefied fuel and the process of vacuum freeze-drying the frozen jellyfish and the like are performed in one processing tank 16. These steps may be performed by separate apparatuses.

  Moreover, in the said embodiment, although LNG which is a liquefied fuel is used as a vaporization heat source for freezing a jellyfish, as a liquefied fuel, it is not restricted to LNG.

The system block diagram of the power plant which concerns on 1st embodiment is shown. The system block diagram of the power plant which concerns on 2nd embodiment is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage tank 2 Supply line 3 Combustor 3 'Boiler 4 Gas turbine 5 Generator 9 Steam turbine 10 Water intake 12 Condenser 15 Heat exchanger 16 Treatment tank 17 Vacuum pump

Claims (2)

Steam in a thermal power plant that generates power with a generator by operating both a gas turbine that uses combustion gas of liquefied fuel as a working medium and a steam turbine that uses steam obtained by heat exchange with the combustion gas as a working medium A method for treating marine organisms such as jellyfish that flow into a water intake line when taking seawater as cooling water for cooling the jellyfish, wherein the recovered jellyfish and the like are frozen using the heat of vaporization of liquefied fuel; and A method for treating marine organisms such as jellyfish, comprising: a step of vacuum-freezing and drying frozen jellyfish. When taking seawater as cooling water for cooling steam in a thermal power plant that generates electricity with a generator by operating a steam turbine using steam obtained by heat exchange with the combustion gas of liquefied fuel as a working medium A method for treating marine organisms such as jellyfish that flows into a water intake line, comprising: a step of freezing the recovered jellyfish using the heat of vaporization of liquefied fuel; and a step of vacuum freeze-drying the frozen jellyfish etc. A method for treating marine organisms such as jellyfish.

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