US20180094885A1 - System and method of cleaning condenser for binary power generation - Google Patents
System and method of cleaning condenser for binary power generation Download PDFInfo
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- US20180094885A1 US20180094885A1 US15/713,794 US201715713794A US2018094885A1 US 20180094885 A1 US20180094885 A1 US 20180094885A1 US 201715713794 A US201715713794 A US 201715713794A US 2018094885 A1 US2018094885 A1 US 2018094885A1
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- Prior art keywords
- pipe
- condenser
- cooling medium
- cleaning
- power generation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
- F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G2015/006—Arrangements for processing a cleaning fluid after use, e.g. filtering and recycling
Definitions
- the present invention relates to a system of cleaning a condenser for binary power generation and a method of cleaning the condenser for binary power generation.
- Binary power generation systems configured to generate electric power by using vapor of a low-boiling working medium such as hydrocarbon or ammonia have been recently known.
- a condenser is used to condense the low-boiling working medium generated after a turbine is rotatably driven.
- seawater or river water externally supplied is used as a cooling medium to be heat-exchanged with the low-boiling working medium (for example, see Japanese Unexamined Patent Application Publication No. 2016-008042).
- the condenser includes: an inlet header into which the cooling medium flows; and a heat exchanger including plural branch ports into which the cooling medium flows from the inlet header, and the heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium.
- the force in the direction of flow of the cooling medium is likely to act on a surface of the inlet header into which the branch ports are opened; in other words, the force in the direction of pressing against the surface is likely to act thereon. Therefore, foreign substances tend to be adhered to the periphery of the branch ports in the surface.
- the condenser is regularly disassembled and cleaned; however, the work to disassemble and clean the condenser is complicated.
- the present invention is thus made in view of the foregoing problems, and it is an object of the present invention to provide a system of cleaning a condenser for binary power generation and a method of cleaning the condenser for binary power generation which enable the removal of foreign substances adhered to the inside of the condenser without disassembling the condenser.
- a system of cleaning a condenser for binary power generation is a system of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system.
- the condenser includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header.
- the heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium.
- the cleaning system includes a switching unit configured to switch a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
- the cleaning system includes the switching unit configured to switch the flow of the cooling medium to the direction from the heat exchanger to the inlet header. Accordingly, the force to separate foreign substances from the branch ports can be applied by the cooling medium to the foreign substances adhered to the periphery of the branch ports in a surface of the inlet header into which the branch ports are opened. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- the cleaning system may include a first pipe allowing the cooling medium to flow into the inlet header of the condenser.
- the cleaning system may include a second pipe allowing the cooling medium to flow out of the condenser.
- the cleaning system may include a third pipe adapted to connect the first pipe to the second pipe.
- the cleaning system may include a fourth pipe adapted to connect a second portion of the first pipe to a fourth portion of the second pipe.
- the second portion of the first pipe is located downward, in a flow direction of the cooling medium, of a first portion of the first pipe to which the third pipe is connected.
- the fourth portion of the second pipe is located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe to which the third pipe is connected.
- the switching unit may switch from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
- the switching unit switches from the first state where the cooling medium flows from the first pipe into the condenser to the second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser. Therefore, the flow of the cooling medium can be switched to the direction from the heat exchanger to the inlet header by the simple configuration.
- the cleaning system may include a strainer provided in the fourth pipe and configured to remove foreign substances in the cooling medium from the cooling medium.
- the cleaning system may include a first pressure meter provided in the first pipe and configured to measure a pressure of the cooling medium flowing from the first pipe to the condenser.
- the cleaning system may include a second pressure meter provided in the second pipe and configured to measure a pressure of the cooling medium flowing out of the condenser.
- an operator can recognize on the basis of a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter whether the flow passage for the cooling medium in the condenser is blocked. This is because as the flow passage for the cooling medium in the condenser is gradually blocked, the pressure of the cooling medium at an inlet side in the condenser increases and the pressure of the cooling medium at an outlet side in the condenser decreases.
- the cleaning system may include a control unit configured to, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has exceeded a predetermined value, control the switching unit to establish the second state.
- the second state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the second state.
- control unit may be configured to, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has reached a value smaller than or equal to the predetermined value, control the switching unit to establish the first state.
- the first state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the first state.
- the cleaning system may include: a first thermometer provided in the first pipe and configured to measure a temperature of the cooling medium flowing from the first pipe into the condenser; and a second thermometer provided in the second pipe and configured to measure a temperature of the cooling medium flowing out of the condenser.
- an operator can recognize on the basis of a temperature difference between a temperature measured by the first thermometer and a temperature measure by the second thermometer whether the flow passage for the cooling medium in the condenser is blocked. This is because as the flow passage for the cooling medium in the condenser is gradually blocked, the flow rate of the cooling medium decreases and the temperature of the cooling medium at the outlet side of the condenser increases.
- the cleaning system may include a control unit configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has exceeded a predetermined value, control the switching unit to establish the second state.
- the second state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the second state.
- control unit may be configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has reached a value smaller than or equal to the predetermined value, control the switching unit to establish the first state.
- a method of cleaning a condenser for binary power generation is a method of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system.
- the condenser includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header.
- the heat exchanger is configured to perform heat exchange between the working medium and the cooling medium and condense the working medium.
- the cleaning method includes the step of switching a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
- the cleaning method includes the step of switching the flow of the cooling medium to the direction from the heat exchanger to the inlet header. Therefore, the force to separate foreign substances from the branch ports can be applied by the switching step to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- the method may include a first branched pipe branched from a first pipe for allowing the cooling medium to flow into the inlet header of the condenser, and the first branched pipe may include a first joint at an end thereof.
- the method may include a second branched pipe branched from a second pipe for allowing the cooing medium to flow out of the condenser, and the second branched pipe may include a second joint at an end thereof.
- the method may include a third branched pipe branched from a second portion of the first pipe, which is located downstream, in a flow direction of the cooling medium, of a first portion of the first pipe from which the first branched pipe is branched, and the third branched pipe may include a third joint at an end thereof.
- the method may include a fourth branched pipe branched from a fourth portion of the second pipe, which is located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe from which the second branched pipe is branched, and the fourth branched pipe may include a fourth joint at an end thereof.
- the method may include a switching unit configured to stop the flow of the cooling medium between the first portion and the second portion of the first pipe and to stop the flow of the cooling medium between the third portion and the fourth portion of the second pipe.
- the method may include: a first step of connecting the first branched pipe through the third pipe to the second branched pipe via the first joint and via the second joint; a second step of connecting the third branched pipe through the fourth pipe to the fourth branched pipe via the third joint and via the fourth joint; and a third step of switching by the switching unit from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
- the first to third steps are performed; thereby, the flow of the cooling medium can be switched to the direction from the heat exchanger to the inlet header. Therefore, the force to separate foreign substances from the branch ports can be applied to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- a system of cleaning a condenser for binary power generation includes a switching unit configured to switch a flow direction of a cooling medium flowing in a condenser to an opposite direction to the flow direction. Accordingly, the flow direction of the cooling medium is switched to the opposite direction; thereby, the force to separate foreign substances from branch ports can be applied to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- FIG. 1 is a schematic configuration diagram showing a binary power generation system in which a system of cleaning a condenser for binary power generation according to a first embodiment is used.
- FIG. 2 is a schematic configuration diagram showing the condenser applied in the system of cleaning the condenser for binary power generation according to the first embodiment.
- FIG. 3 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during normal operation according to the first embodiment.
- FIG. 4 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the first embodiment.
- FIG. 5 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation according to a second embodiment.
- FIG. 6 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the second embodiment.
- FIG. 7 is a diagram illustrating the control operation of a control unit in the system of cleaning the condenser for binary power generation according to the second embodiment.
- FIG. 8 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation according to a third embodiment.
- FIG. 9 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the third embodiment.
- FIG. 10 is a diagram illustrating the control operation of a control unit in the system of cleaning the condenser for binary power generation according to the third embodiment.
- FIG. 11 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation of the condenser according to a fourth embodiment.
- FIG. 12 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during cleaning of the condenser according to the fourth embodiment.
- FIG. 13 is a schematic configuration diagram showing a method of cleaning the condenser for binary power generation during normal operation of the condenser according to a fifth embodiment.
- FIG. 14 is a schematic configuration diagram showing the method of cleaning the condenser for binary power generation during cleaning of the condenser according to the fifth embodiment.
- each of the drawings simply shows major components to be required for describing a system of cleaning a condenser for binary power generation according to each of the embodiments of the present invention. Accordingly, the system of cleaning the condenser for binary power generation according to each embodiment of the present invention can include any components that are not shown in the drawings referred to as by the specification.
- FIG. 1 is a schematic configuration diagram illustrating a binary power generation system 1 in which a system of cleaning a condenser for binary power generation is used.
- the binary power generation system 1 is a power generation system utilizing a Rankine cycle.
- the binary power generation system 1 includes a condenser 6 , a circulation pump 8 , a heater 10 , and an expander 14 .
- the condenser 6 , the circulation pump 8 , the heater 10 , and the expander 14 are provided in a circulation flow passage 4 in the mentioned order.
- a circulation circuit is configured in the binary power generation system 1 such that a working medium flows through the circulation flow passage 4 via the heater 10 , the expander 14 , the condenser 6 and the circulation pump 8 in the mentioned order.
- a cooling medium having a boiling point lower than the boiling point of water is applied as the working medium.
- the circulation pump 8 is provided downstream of the condenser 6 (between the heater 10 and the condenser 6 ) in the circulation flow passage 4 .
- the circulation pump 8 serves to circulate the working medium in the circulation flow passage 4 .
- the circulation pump 8 pressurizes the liquid working medium condensed in the condenser 6 to a predetermined pressure and thereafter pumps the working medium to the heater 10 .
- a centrifugal pump provided with an impeller as a rotor or a gear pump including a rotor formed by a pair of gears is applied as the circulation pump 8 .
- the circulation pump 8 is controlled to be driven by a controller 30 .
- the function of the controller 30 includes a pump control unit 30 a .
- the pump control unit 30 a is configured to control the number of rotations of the circulation pump 8 .
- the pump control unit 30 a controls the circulation pump 8 to be driven so that the degree of superheat of the working medium may fall within a preliminarily-established range. Also, the pump control unit 30 a controls the circulation pump 8 to start and stop.
- the heater 10 is provided downstream of the circulation pump 8 (between the circulation pump 8 and the expander 14 ) in the circulation flow passage 4 .
- the heater 10 includes a working medium flow passage 10 a through which the working medium flows and a heat source medium flow passage 10 b through which a heat source medium flows.
- the heat source medium flow passage 10 b is connected to a heat source medium circuit 72 .
- the heat source medium supplied from an external heat source flows through the heat source medium flow passage 10 b .
- the working medium flowing through the working medium flow passage 10 a is heat-exchanged with the heat source medium flowing through the heat source medium flow passage 10 b to evaporate.
- the heat source medium may include, for example, hot water, water vapor, or the like.
- a generator 16 is connected to the expander 14 .
- a gaseous working medium is expanded in the expander 14 ; thereby, the power to drive the generator 16 can be derived.
- FIG. 2 is a schematic configuration diagram illustrating the condenser 6 applied in a system X 1 of cleaning the condenser 6 for binary power generation.
- the condenser 6 serves to condense the gaseous working medium discharged from the expander 14 to generate the liquid working medium.
- the condenser 6 includes: a heat exchanger 6 a configured to conduct heat exchange between the working medium and a cooling medium and condense the working medium; an inlet header 6 b for allowing inflow of the cooling medium into the heat exchanger 6 a ; and an outlet header 6 c for allowing outflow of the cooling medium that has flowed through the heat exchanger 6 a .
- any of a plate condenser, a shell-and-tube condenser, and a fin-and-tube condenser can be used as the condenser 6 .
- the heat exchanger 6 a is formed such that working medium flow passages S 1 through each of which the gaseous working medium flows and cooling medium flow passages S 2 through each of which the cooling medium flows are arranged alternately side by side with each other in an up to down direction.
- the flow direction of the working medium is different by 90 degrees from the flow direction of the cooling medium.
- the heat exchanger 6 a includes: plural branch ports 11 for allowing inflow of the cooling medium from the inlet header 6 b ; and plural joint ports 12 for allowing outflow of the cooling medium to the outlet header 6 c.
- the inlet header 6 b is formed to be elongated in a direction perpendicular to the flow direction of the cooling medium.
- An inflow port 17 for the cooling medium is formed in a surface 13 of the inlet header 6 b , which is located upstream in the flow direction of the cooling medium.
- a first pipe 18 for allowing the cooling medium from a supply source of the cooling medium into the inlet header 6 b is connected to the inflow port 17 .
- the supply source (not shown) of the cooling medium may include, for example, seawater or river water.
- the plural branch ports 11 are provided at intervals and opened to a surface 19 of the inlet header 6 b , which is located downstream in the flow direction of the cooling medium.
- the outlet header 6 c is formed to be elongated in a direction perpendicular to the flow direction of the cooling medium.
- the plural joint ports 12 are opened to a surface 20 of the outlet header 6 c , which is located upstream in the flow direction of the cooling medium.
- An outflow port 22 for the cooling medium is formed in a surface 21 of the outlet header 6 c , which is located downstream in the flow direction of the cooling medium.
- a second pipe 23 for allowing the cooling medium to flow out from the outlet header 6 c into the supply source of the cooling medium is connected to the outflow port 22 .
- the circulation pump 8 When the circulation pump 8 is driven, the liquid working medium pumped from the circulation pump 8 flows into the working medium flow passage 10 a of the heater 10 .
- the working medium is heated by the heat source medium flowing through the heat source medium flow passage 10 b , therefore evaporating.
- the working medium evaporated in the heater 10 is supplied into the expander 14 .
- the working medium is supplied into the expander 14 and thereby the expander 14 is rotatably driven.
- the generator 16 is driven to generate electric power.
- the working medium expanded in the expander 14 is discharged into the circulation flow passage 4 .
- the gaseous working medium discharged from the expander 14 is supplied into the working medium flow passages S 1 of the condenser 6 .
- the working medium is cooled by the cooling medium flowing through the cooling medium flow passages S 2 to be condensed to the liquid working medium.
- the liquid working medium flows through the circulation flow passage 4 to be suctioned into the circulation pump 8 .
- such circulation is repeated and thereby electric power is generated in the generator 16 .
- FIG. 3 is a schematic configuration diagram illustrating the system X 1 of cleaning the condenser 6 for binary power generation during normal operation.
- the system X 1 of cleaning the condenser 6 for binary power generation includes a third pipe 24 and a fourth pipe 25 .
- the third pipe 24 establishes a connection between the first pipe 18 and the second pipe 23 .
- the fourth pipe 25 establishes a connection between a second portion P 2 of the first pipe 18 and a fourth portion P 4 of the second pipe 23 .
- the second portion P 2 is located downstream, in the flow direction of the cooling medium, of a first portion P 1 of the first pipe 18 to which the third pipe 24 is connected.
- the fourth portion P 4 is located downstream, in the flow direction of the cooling medium, of a third portion P 3 of the second pipe 23 to which the third pipe 24 is connected.
- the system X 1 of cleaning the condenser 6 for binary power generation further includes: a switching unit 26 configured to switch the flow of the cooling medium to a direction from the heat exchanger 6 a to the inlet header 6 b ; and a strainer 27 configured to remove foreign substances in the cooling medium from the cooling medium.
- the switching unit 26 includes a first on-off valve 26 a interposed between the first portion P 1 and the second portion P 2 of the first pipe 18 , a second on-off valve 26 b interposed between the third portion P 3 and the fourth portion P 4 of the second pipe 23 , a third on-off valve 26 c provided in the third pipe 24 , and a fourth on-off valve 26 d provided in the fourth pipe 25 .
- the switching unit 26 can switch from a first state where the cooling medium flows from the first pipe 18 into the condenser 6 to a second state where the cooling medium flows from the first pipe 18 through the third pipe 24 and the second pipe 23 into the condenser 6 .
- the switching unit 26 opens the first on-off valve 26 a and the second on-off valve 26 b and closes the third on-off valve 26 c and the fourth on-off valve 26 d , thereby establishing the first state.
- the switching unit 26 closes the first on-off valve 26 a and the second on-off valve 26 b and opens the third on-off valve 26 c and the fourth on-off valve 26 d , thereby establishing the second state.
- Manual valves that can manually open and close flow passages of fluid may be applied as the first to fourth on-off valves 26 a to 26 d.
- the system X 1 of cleaning the condenser 6 for binary power generation operates as follows.
- the first on-off valve 26 a and the second on-off valve 26 b are opened by an operator and the third on-off valve 26 c and the fourth on-off valve 26 d are closed by the operator.
- the flow of the cooling medium is brought into the first state where the cooling medium flows from the first pipe 18 into the condenser 6 and then flows out into the second pipe 23 .
- the force in the flow direction of the cooling medium i.e. the force in a direction in which foreign substances FS are pushed against the surface 19 is likely to act on the surface 19 of the inlet header 6 b , which is located downstream in the flow direction of the cooling medium. Therefore, the foreign substances FS are easily adhered to the surface 19 of the inlet header 6 b , which is located downstream in the flow direction of the cooling medium.
- FIG. 4 is a schematic configuration diagram illustrating the system X 1 of cleaning the condenser 6 for binary power generation during cleaning of the condenser 6 .
- the cooling medium in the condenser 6 flows in the direction from the heat exchanger 6 a to the inlet header 6 b , as shown in FIG. 2 . Accordingly, the force in such a direction to separate the foreign substances FS from the branch ports 11 acts on the foreign substances FS adhered to the periphery of the branch ports 11 in the surface 19 of the inlet header 6 b , which is located downstream in the flow direction of the cooling medium. Therefore, the foreign substances FS adhered to the periphery of the branch ports 11 in the surface 19 of the inlet header 6 b , which is located downstream in the flow direction of the cooling medium easily separate from the periphery of the branch ports 11 . Consequently, the foreign substances FS can be removed without disassembling the condenser 6 .
- the foreign substances FS separated from the periphery of the branch ports 11 are discharged together with the cooling medium into the first pipe 18 , thereafter flowing through the fourth pipe 25 . At this time, the foreign substances FS in the cooling medium are removed from the cooling medium by the strainer 27 . Therefore, the foreign substances FS are easily removed.
- FIG. 5 is a schematic configuration diagram illustrating the system X 2 of cleaning the condenser 6 for binary power generation during normal operation.
- FIG. 6 is a schematic configuration diagram illustrating the system X 2 of cleaning the condenser 6 for binary power generation during cleaning of the condenser 6 .
- the system X 2 of cleaning the condenser 6 for binary power generation according to the second embodiment includes a first pressure meter 31 , a second pressure meter 32 , a switching unit 33 , and a control unit 34 .
- the switching unit 33 of the second embodiment is different from that of the first embodiment where manual valves for manually opening and closing flow passages of fluid are used in that automatic valves for opening and closing flow passages of fluid on the basis of an electric signal are used.
- Other configurations of the switching unit 33 of the second embodiment are similar to the configurations of the first embodiment.
- the first pressure meter 31 includes a first pressure sensor (not shown) for measuring the pressure of the cooling medium flowing from the first pipe 18 into the condenser 6 .
- the first pressure meter 31 is provided in the first pipe 18 .
- the second pressure meter 32 includes a second pressure sensor (not shown) for measuring the pressure of the cooling medium flowing out of the condenser 6 .
- the second pressure meter 32 is provided in the second pipe 23 . Pressure values measured by the first pressure sensor and the second pressure sensor are output therefrom as electric signals to the control unit 34 .
- the control unit 34 controls the switching unit 33 to switch so that the flow of the cooling medium is brought into the second state. Further, when a pressure difference between a pressure value measured by the first pressure meter 31 and a pressure value measured by the second pressure meter 32 has reached a value smaller than or equal to the predetermined value, the control unit 34 controls the switching unit 33 to switch so that the flow of the cooling medium is brought into the first state.
- the predetermined value can be set accordingly in consideration of, for example, the pressure of a pump for pumping the cooling medium and a pressure loss and on the basis of a pressure difference assumed when the flow passage for the cooling medium in the condenser 6 is actually blocked.
- the predetermined value can be set to a pressure difference generated when a pressure value measured by the second pressure meter 32 has been half a pressure value measured by the first pressure meter 31 .
- FIG. 7 is a diagram illustrating the control operation of the control unit 34 in the system X 2 of cleaning the condenser 6 for binary power generation.
- the control unit 34 receives electric signals from the first pressure sensor and the second pressure sensor (step ST 1 ).
- the control unit 34 receives the electric signals in step ST 1 and thereafter subtracts a pressure value measured by the second pressure sensor from a pressure value measured by the first pressure sensor; thereby computing a pressure difference (step ST 2 ).
- the control unit 34 computes the pressure difference and thereafter determines whether the pressure difference is smaller than or equal to the predetermined value.
- the control unit 34 has determined that the pressure difference is smaller than or equal to the predetermined value (Yes in step ST 3 )
- the processing goes to step ST 4 .
- the control unit 34 has determined that the pressure difference is larger than the predetermined value (No in step ST 3 )
- the processing goes to step ST 6 .
- step ST 4 the control unit 34 determines whether the flow of the cooling medium is presently in the first state.
- the processing returns to step ST 1 .
- the control unit 34 has determined that the flow of the cooling medium is presently in the second state (No in step ST 4 )
- the processing goes to step ST 5 .
- step ST 5 the control unit 34 sends to the first to fourth on-off valves 26 a to 26 d control signals for switching the flow of the cooling medium to the first state (step ST 5 ).
- control unit 34 sends to the first on-off valve 26 a and the second on-off valve 26 b the control signals for opening the flow passage for the cooling medium and sends to the third on-off valve 26 c and the fourth on-off valve 26 d the control signals for closing the flow passage for the cooling medium. Accordingly, the flow passage for the cooling medium is opened by the first on-off valve 26 a and the second on-off valve 26 b and the flow passage for the cooling medium is closed by the third on-off valve 26 c and the fourth on-off valve 26 d . Thus, the flow of the cooling medium is switched from the second state to the first state. When the flow of the cooling medium has been switched from the second state to the first state, the control unit 34 returns the processing to step ST 1 (step ST 5 ).
- step ST 6 the control unit 34 determines whether the flow of the cooling medium is presently in the second state.
- the processing returns to step ST 1 .
- the control unit 34 has determined that the flow of the cooling medium is presently in the first state (No in step ST 6 )
- the processing goes to step ST 7 .
- step ST 7 the control unit 34 sends to the first to fourth on-off valves 26 a to 26 d control signals for switching the flow of the cooling medium to the second state (step ST 7 ).
- control unit 34 sends to the first on-off valve 26 a and the second on-off valve 26 b the control signals for closing the flow passage for the cooling medium and sends to the third on-off valve 26 c and the fourth on-off valve 26 d the control signals for opening the flow passage for the cooling medium. Accordingly, the flow passage for the cooling medium is closed by the first on-off valve 26 a and the second on-off valve 26 b and the flow passage for the cooling medium is opened by the third on-off valve 26 c and the fourth on-off valve 26 d . Thus, the flow of the cooling medium is switched from the first state to the second state.
- control unit 34 When the flow of the cooling medium has been switched from the first state to the second state, the control unit 34 returns the processing to step ST 1 (step ST 7 ).
- the control unit 34 repeats the processing of steps ST 1 to ST 7 until a power supply of the system X 2 of cleaning the condenser 6 for binary power generation according to the second embedment is turned off
- the system X 2 of cleaning the condenser 6 for binary power generation according to the second embodiment is automatically switched to the second state where the cooling medium flows from the first pipe 18 through the third pipe 24 and the second pipe 23 into the condenser 6 . Therefore, foreign substances FS adhered to the periphery of the branch ports 11 are automatically separated. Consequently, the foreign substances FS can be removed without disassembling the condenser 6 .
- the system X 2 of cleaning the condenser 6 for binary power generation according to the second embodiment is automatically switched to the first state where the cooling medium flows from the first pipe 18 via the condenser 6 to the second pipe 23 . Therefore, when the blocking of the flow passage for the cooling medium in the condenser 6 is solved, an operator does not need to perform the switching operation to the first state.
- the system X 2 of cleaning the condenser 6 for binary power generation according to the second embodiment includes the control unit 34 .
- the cleaning system X 2 may not include the control unit 34 .
- an operator determines on the basis of a pressure difference between a pressure value measured by the first pressure meter 31 and a pressure value measured by the second pressure meter 32 whether the flow passage for the cooling medium in the condenser 6 is blocked. If the operator has determined that the flow passage for the cooling medium in the condenser 6 is blocked, the operator manually performs the switching operation of the first to fourth on-off valves 26 a to 26 d so that the flow of the cooling medium is brought into the second state.
- the operator manually performs the switching operation of the first to fourth on-off valves 26 a to 26 d so that the flow of the cooling medium is brought into the first state.
- manual valves are applied as the first to fourth on-off valves 26 a to 26 d.
- the control unit 34 controls to switch between the first state and the second state on the basis of the pressure difference.
- the control unit 34 may control to switch between the first state and the second state on the basis of a pressure ratio.
- FIG. 8 is a schematic configuration diagram illustrating a system X 3 of cleaning the condenser 6 for binary power generation during normal operation.
- FIG. 9 is a schematic configuration diagram illustrating the system X 3 of cleaning the condenser 6 for binary power generation during cleaning of the condenser 6 .
- the system X 3 of cleaning the condenser 6 for binary power generation according to the third embodiment includes, in place of the first pressure meter 31 and the second pressure meter 32 of the second embodiment, a first thermometer 41 for measuring the temperature of the cooling medium flowing from the first pipe 18 into the condenser 6 and a second thermometer 42 for measuring the temperature of the cooling medium flowing out of the condenser 6 .
- the system X 3 of cleaning the condenser 6 for binary power generation according to the third embodiment further includes a control unit 43 in place of the control unit 34 of the second embodiment.
- Other configurations of the third embodiment are similar to the configurations of the second embodiment and thus will be assigned with the same reference numbers as the second embodiment and will not be described.
- the first thermometer 41 includes a first temperature sensor (not shown) for measuring the temperature of the cooling medium flowing from the first pipe 18 into the condenser 6 .
- the first thermometer 41 is provided in the first pipe 18 .
- the second thermometer 42 includes a second temperature sensor (not shown) for measuring the temperature of the cooling medium flowing out of the condenser 6 .
- the second thermometer 42 is provided in the second pipe 23 .
- the temperatures measured by the first temperature sensor and the second temperature sensor are output therefrom as electric signals to the control unit 43 .
- the control unit 43 controls the switching unit 33 to switch so that the flow of the cooling medium is brought into the second state. Further, when a temperature difference between the temperature measured by the first thermometer 41 and the temperature measured by the second thermometer 42 has reached a value smaller than or equal to the predetermined value, the control unit 43 controls the switching unit 33 to switch so that the flow of the cooling medium is brought into the first state.
- the predetermined value can be set accordingly in consideration of, for example, the specific heat of the cooling medium and the temperature of the working medium to be heat-exchanged with the cooling medium and on the basis of a temperature difference assumed when the flow passage for the cooling medium in the condenser 6 is actually blocked.
- the predetermined value can be set to a pressure difference generated when the temperature measured by the second thermometer 42 has become twice as high as the temperature measured by the first thermometer 41 .
- FIG. 10 is a diagram illustrating the control operation of the control unit 43 in the system X 3 of cleaning the condenser 6 for binary power generation.
- the control unit 43 subtracts the temperature value measured by the first temperature sensor from the temperature measured by the second temperature sensor to compute a temperature difference (step ST 8 ).
- Other steps of the third embodiment are similar to the steps of the second embodiment and thus will not be described.
- the flow of the cooling medium is automatically switched to the second state. Accordingly, foreign substances FS adhered to the periphery of the branch ports 11 are automatically separated therefrom; therefore, the foreign substances can be removed without disassembling the condenser 6 .
- the flow of the cooling medium is automatically switched to the first state. Accordingly, when the blocking of the flow passage for the cooling medium in the condenser 6 is solved, an operator does not need to perform switching operation to the first state.
- the system X 3 of cleaning the condenser 6 for binary power generation according to the third embodiment includes the control unit 34 .
- the system X 3 may not include the control unit 34 .
- an operator performs the switching operation from the first state to the second state in the same way as in the case of the second embodiment where the control unit 34 is not provided.
- the predetermined value is set on the basis of a pressure difference
- the predetermined value is set on the basis of a temperature difference
- each of the predetermine values may be set on the basis of a difference between flow rates.
- a first flowmeter (not shown) for measuring the flow rate of the cooling medium flowing from the first pipe 18 into the condenser 6
- a second flowmeter (not shown) for measuring the flow rate of the cooling medium flowing out of the condenser 6 are provided.
- FIG. 11 is a schematic configuration diagram illustrating a system X 4 of cleaning the condenser 6 for binary power generation during normal operation of the condenser 6 .
- the system X 4 of cleaning the condenser 6 for binary power generation according to a fourth embodiment is different from the system X 1 according to the first embodiment in that three-way valves are applied as a switching unit 51 for reversing the flow direction of the cooling medium in the condenser 6 .
- Other configurations of the fourth embodiment are similar to the configurations of the first embodiment and thus will be assigned with the same reference numbers as the first embodiment and will not be described.
- the switching unit 51 includes: a first three-way valve 51 a provided on the first portion P 1 in the first pipe 18 ; and a second three-way valve 51 b provided on the fourth portion P 4 in the second pipe 23 .
- the first three-way valve 51 a is configured to open and close the flow passage of the first pipe 18 and to open and close the flow passage of the third pipe 24 .
- the second three-way valve 51 b is configured to open and close the flow passage of the second pipe 23 and to open and close the flow passage of the fourth pipe 25 .
- the system X 4 of cleaning the condenser 6 for binary power generation according to the fourth embodiment operates as follows. In order that the flow of the cooling medium is brought into the first state during normal operation, firstly, an operator opens the flow passage of the first pipe 18 of the first three-way valve 51 a and closes the flow passage of the third pipe 24 , and in addition, the operator opens the flow passage of the second pipe 23 of the second three-way valve 51 b and closes the flow passage of the fourth pipe 25 . Thus, the system X 4 of cleaning the condenser 6 for binary power generation according to the fourth embodiment is brought into the first state where the cooling medium flows from the first pipe 18 into the condenser 6 and then flows out to the second pipe 23 .
- FIG. 12 is a schematic configuration diagram illustrating the system X 4 of cleaning the condenser 6 for binary power generation.
- the system X 4 of cleaning the condenser 6 for binary power generation according to the fourth embodiment is configured to switch between the first state and the second state by two valves, that is, the first three-way valve 51 a and the second three-way valve 51 b ; therefore, the switching operation is easy compared to the foregoing first to third embodiments.
- FIG. 13 is a schematic configuration diagram illustrating a method of cleaning the condenser 6 for binary power generation during normal operation of the condenser 6 .
- the method of cleaning the condenser 6 for binary power generation of a fifth embodiment is different from that of the first embodiment in that the third pipe 24 and the fourth pipe 25 are not provided during normal operation.
- the method of cleaning the condenser 6 for binary power generation according to the fifth embodiment is different from that of the first embodiment in that a switching unit 61 is provided in place of the switching unit 26 of the first embodiment.
- Other configurations of the fifth embodiment are similar to the configurations of the first embodiment and thus will be assigned with the same reference numbers as the first embodiment and will not be described.
- a cleaning system X 5 used in the method of cleaning the condenser 6 for binary power generation according to the fifth embodiment includes: a first branched pipe 62 branched from the first pipe 18 and provided with a first joint 62 a at an end thereof; and a second branched pipe 63 branched from the second pipe 23 and provided with a second joint 63 a at an end thereof.
- the cleaning system X 5 used in the method of cleaning the condenser 6 for binary power generation according to the fifth embodiment includes a third branched pipe 64 branched from the second portion P 2 .
- the second portion P 2 is located downstream, in the flow direction of the cooling medium, of the first portion P 1 of the first pipe 18 on which the first branched pipe 62 is located.
- a third joint 64 a is provided at an end of the third branched pipe 64 .
- the cleaning system X 5 used in the method of cleaning the condenser 6 for binary power generation according to the fifth embodiment includes a fourth branched pipe 65 branched from the fourth portion P 4 .
- the fourth portion P 4 is located downstream, in the flow direction of the cooling medium, of the third portion P 3 of the second pipe 23 on which the second branched pipe 63 is located.
- a fourth joint 65 a is provided at an end of the fourth branched pipe 65 .
- the switching unit 61 includes: a fifth on-off valve 61 a interposed between the first portion P 1 and the second portion P 2 of the first pipe 18 ; and a sixth on-off valve 61 b interposed between the third portion P 3 and the fourth portion P 4 of the second pipe 23 .
- an operator opens the fifth on-off valve 61 a and closes the sixth on-off valve 61 b so that the flow of the cooling medium is brought into the first state during normal operation.
- the cleaning system X 5 used in the method of cleaning the condenser 6 for binary power generation according to the fifth embodiment is brought into the first state where the cooling medium flows from the first pipe 18 into the condenser 6 and flows out to the second pipe 23 .
- the first to fourth joints 62 a to 65 a of the first to fourth branched pipes 62 to 65 are closed; therefore, no cooling medium flows out of the first to fourth branched pipes 62 to 65 .
- FIG. 14 is a schematic configuration diagram illustrating the method of cleaning the condenser 6 for binary power generation during cleaning of the condenser 6 .
- the operator performs the first step of connecting the first branched pipe 62 through the third pipe 24 to the second branched pipe 63 via the first joint 62 a and via the second joint 63 a .
- the operator performs the second step of connecting the third branched pipe 64 through the fourth pipe 25 to the fourth branched pipe 65 via the third joint 64 a and via the fourth joint 65 a .
- the operator performs the third step of closing the fifth on-off valve 61 a and the sixth on-off valve 61 b .
- the operator activates the pump (not shown) provided upstream in the first pipe 18 to flow the cooling medium.
- the flow of the cooling medium is stopped between the first portion P 1 and the second portion P 2 of the first pipe 18 and between the third portion P 3 and the fourth portion P 4 of the second pipe 23 . Therefore, the cooling medium flows through the first pipe 18 , the first branched pipe 62 , the third pipe 24 , the second branched pipe 63 , the second pipe 23 , the condenser 6 , the first pipe 18 , the third branched pipe 64 , the fourth pipe 25 , the fourth branched pipe 65 , and the second pipe 23 in the mentioned order.
- the flow of the cooling medium is switched to the second state; therefore, cleaning of the condenser 6 is performed.
- the operator stops the pump (not shown) provided upstream in the first pipe 18 to stop the flow of the cooling medium. Thereafter, the operator removes the third pipe 24 and the fourth pipe 25 and closes the first to fourth joints 62 a to 65 a . Finally, the operator activates the pump (not shown) provided upstream in the first pipe 18 to flow the cooling medium. Thus, the operator switches the flow of the cooling medium from the second state to the first state.
- the first to third steps are performed; thereby, the flow of the cooling medium can be switched to a direction from the heat exchanger 6 a to the inlet header 6 b . Accordingly, the force in a direction to separate foreign substances from the branch ports 11 can be applied to the foreign substances adhered to the periphery of the branch ports 11 . Therefore, the foreign substances adhered to the periphery of the branch ports 11 are easily separated therefrom. Consequently, the foreign substances can be removed without disassembling the condenser 6 .
- the method of cleaning the condenser 6 for binary power generation of the fifth embodiment as long as the blocking of the flow passage for the cooling medium in the condenser 6 does not occur, the operator may not have to perform the first step to the third step. Therefore, the method of cleaning the condenser 6 for binary power generation of the fifth embodiment can reduce installation costs.
- respective on-off valves (not shown) for opening and closing the flow passage for the cooling medium may be provided in the first to fourth branched pipes 62 to 65 . Therefore, in a state where the on-off valves are closed, an operator can connect the third pipe 24 to the first branched pipe 62 and the second branched pipe 63 without stopping the flow of the cooling medium. Likewise, the operator can connect the fourth pipe 25 to the third branched pipe 64 and the fourth branched pipe 65 without stopping the flow of the cooling medium.
- the strainer 27 for removing the foreign substances FS in the cooling medium from the cooling medium is provided in the fourth pipe 25 .
- the strainer 27 may not be provided.
- the foreign substances FS in the cooling medium are released together with the cooling medium into the sea or the river. Therefore, marine organisms adhered to the inside of the condenser 6 will be returned into the sea or the like, which is environmentally friendly.
Abstract
A system of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system, includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header. The heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium. The cleaning system includes a switching unit configured to switch a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
Description
- The present invention relates to a system of cleaning a condenser for binary power generation and a method of cleaning the condenser for binary power generation.
- Binary power generation systems configured to generate electric power by using vapor of a low-boiling working medium such as hydrocarbon or ammonia have been recently known. In each of such binary power generation systems, a condenser is used to condense the low-boiling working medium generated after a turbine is rotatably driven. In the condenser, seawater or river water externally supplied is used as a cooling medium to be heat-exchanged with the low-boiling working medium (for example, see Japanese Unexamined Patent Application Publication No. 2016-008042).
- Here, the condenser includes: an inlet header into which the cooling medium flows; and a heat exchanger including plural branch ports into which the cooling medium flows from the inlet header, and the heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium. The force in the direction of flow of the cooling medium is likely to act on a surface of the inlet header into which the branch ports are opened; in other words, the force in the direction of pressing against the surface is likely to act thereon. Therefore, foreign substances tend to be adhered to the periphery of the branch ports in the surface.
- In particular, if the seawater or the river water is applied as the cooling medium, marine organisms are possibly included in the cooling medium. Accordingly, foreign substances such as marine organisms tend to be adhered to the periphery of the branch ports in the surface. Therefore, a flow passage for the cooling medium in the condenser is blocked with the foreign substances and thus heat exchanging performance of the condenser may deteriorate. Consequently, the condenser is regularly disassembled and cleaned; however, the work to disassemble and clean the condenser is complicated.
- The present invention is thus made in view of the foregoing problems, and it is an object of the present invention to provide a system of cleaning a condenser for binary power generation and a method of cleaning the condenser for binary power generation which enable the removal of foreign substances adhered to the inside of the condenser without disassembling the condenser.
- A system of cleaning a condenser for binary power generation according to an aspect of the present invention is a system of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system. The condenser includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header. The heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium. The cleaning system includes a switching unit configured to switch a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
- According to this configuration, the cleaning system includes the switching unit configured to switch the flow of the cooling medium to the direction from the heat exchanger to the inlet header. Accordingly, the force to separate foreign substances from the branch ports can be applied by the cooling medium to the foreign substances adhered to the periphery of the branch ports in a surface of the inlet header into which the branch ports are opened. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- In the foregoing configuration, the cleaning system may include a first pipe allowing the cooling medium to flow into the inlet header of the condenser. The cleaning system may include a second pipe allowing the cooling medium to flow out of the condenser. The cleaning system may include a third pipe adapted to connect the first pipe to the second pipe. The cleaning system may include a fourth pipe adapted to connect a second portion of the first pipe to a fourth portion of the second pipe. The second portion of the first pipe is located downward, in a flow direction of the cooling medium, of a first portion of the first pipe to which the third pipe is connected. The fourth portion of the second pipe is located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe to which the third pipe is connected. The switching unit may switch from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
- According to this configuration, the switching unit switches from the first state where the cooling medium flows from the first pipe into the condenser to the second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser. Therefore, the flow of the cooling medium can be switched to the direction from the heat exchanger to the inlet header by the simple configuration.
- In the foregoing configuration, the cleaning system may include a strainer provided in the fourth pipe and configured to remove foreign substances in the cooling medium from the cooling medium.
- According to this configuration, the foreign substances separated from the periphery of the branch ports are caught by the strainer; therefore, the foreign substances are further easily removed.
- In the foregoing configuration, the cleaning system may include a first pressure meter provided in the first pipe and configured to measure a pressure of the cooling medium flowing from the first pipe to the condenser. The cleaning system may include a second pressure meter provided in the second pipe and configured to measure a pressure of the cooling medium flowing out of the condenser.
- According to this configuration, an operator can recognize on the basis of a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter whether the flow passage for the cooling medium in the condenser is blocked. This is because as the flow passage for the cooling medium in the condenser is gradually blocked, the pressure of the cooling medium at an inlet side in the condenser increases and the pressure of the cooling medium at an outlet side in the condenser decreases.
- In the foregoing configuration, the cleaning system may include a control unit configured to, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has exceeded a predetermined value, control the switching unit to establish the second state.
- According to this configuration, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has exceeded the predetermined value, the second state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the second state.
- In the foregoing configuration, the control unit may be configured to, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has reached a value smaller than or equal to the predetermined value, control the switching unit to establish the first state.
- According to this configuration, when a pressure difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has reached a value smaller than or equal to the predetermined value, the first state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the first state.
- In the foregoing configuration, the cleaning system may include: a first thermometer provided in the first pipe and configured to measure a temperature of the cooling medium flowing from the first pipe into the condenser; and a second thermometer provided in the second pipe and configured to measure a temperature of the cooling medium flowing out of the condenser.
- According to this configuration, an operator can recognize on the basis of a temperature difference between a temperature measured by the first thermometer and a temperature measure by the second thermometer whether the flow passage for the cooling medium in the condenser is blocked. This is because as the flow passage for the cooling medium in the condenser is gradually blocked, the flow rate of the cooling medium decreases and the temperature of the cooling medium at the outlet side of the condenser increases.
- In the foregoing configuration, the cleaning system may include a control unit configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has exceeded a predetermined value, control the switching unit to establish the second state.
- According to this configuration, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has exceeded the predetermined value, the second state is automatically established by the control unit. Therefore, an operator does not need to perform switching operation to the second state.
- In the foregoing configuration, the control unit may configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has reached a value smaller than or equal to the predetermined value, control the switching unit to establish the first state.
- According to this configuration, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has reached a value smaller than or equal to the predetermined value, the flow of the cooling medium is automatically switched to the first state by the control unit. Therefore, an operator does not need to perform switching operation to the first state.
- A method of cleaning a condenser for binary power generation according to another aspect of the present invention is a method of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system. The condenser includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header. The heat exchanger is configured to perform heat exchange between the working medium and the cooling medium and condense the working medium. The cleaning method includes the step of switching a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
- According to this configuration, the cleaning method includes the step of switching the flow of the cooling medium to the direction from the heat exchanger to the inlet header. Therefore, the force to separate foreign substances from the branch ports can be applied by the switching step to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- In the foregoing configuration, the method may include a first branched pipe branched from a first pipe for allowing the cooling medium to flow into the inlet header of the condenser, and the first branched pipe may include a first joint at an end thereof. The method may include a second branched pipe branched from a second pipe for allowing the cooing medium to flow out of the condenser, and the second branched pipe may include a second joint at an end thereof. The method may include a third branched pipe branched from a second portion of the first pipe, which is located downstream, in a flow direction of the cooling medium, of a first portion of the first pipe from which the first branched pipe is branched, and the third branched pipe may include a third joint at an end thereof. The method may include a fourth branched pipe branched from a fourth portion of the second pipe, which is located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe from which the second branched pipe is branched, and the fourth branched pipe may include a fourth joint at an end thereof. The method may include a switching unit configured to stop the flow of the cooling medium between the first portion and the second portion of the first pipe and to stop the flow of the cooling medium between the third portion and the fourth portion of the second pipe. The method may include: a first step of connecting the first branched pipe through the third pipe to the second branched pipe via the first joint and via the second joint; a second step of connecting the third branched pipe through the fourth pipe to the fourth branched pipe via the third joint and via the fourth joint; and a third step of switching by the switching unit from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
- According to this configuration, the first to third steps are performed; thereby, the flow of the cooling medium can be switched to the direction from the heat exchanger to the inlet header. Therefore, the force to separate foreign substances from the branch ports can be applied to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
- According to the present invention, a system of cleaning a condenser for binary power generation includes a switching unit configured to switch a flow direction of a cooling medium flowing in a condenser to an opposite direction to the flow direction. Accordingly, the flow direction of the cooling medium is switched to the opposite direction; thereby, the force to separate foreign substances from branch ports can be applied to the foreign substances adhered to the periphery of the branch ports. Therefore, the foreign substances adhered to the periphery of the branch ports are easily separated therefrom and thus the foreign substances can be removed without disassembling the condenser.
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FIG. 1 is a schematic configuration diagram showing a binary power generation system in which a system of cleaning a condenser for binary power generation according to a first embodiment is used. -
FIG. 2 is a schematic configuration diagram showing the condenser applied in the system of cleaning the condenser for binary power generation according to the first embodiment. -
FIG. 3 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during normal operation according to the first embodiment. -
FIG. 4 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the first embodiment. -
FIG. 5 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation according to a second embodiment. -
FIG. 6 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the second embodiment. -
FIG. 7 is a diagram illustrating the control operation of a control unit in the system of cleaning the condenser for binary power generation according to the second embodiment. -
FIG. 8 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation according to a third embodiment. -
FIG. 9 is a schematic configuration diagram showing the system of cleaning the condenser for binary power generation during cleaning of the condenser according to the third embodiment. -
FIG. 10 is a diagram illustrating the control operation of a control unit in the system of cleaning the condenser for binary power generation according to the third embodiment. -
FIG. 11 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during normal operation of the condenser according to a fourth embodiment. -
FIG. 12 is a schematic configuration diagram showing a system of cleaning the condenser for binary power generation during cleaning of the condenser according to the fourth embodiment. -
FIG. 13 is a schematic configuration diagram showing a method of cleaning the condenser for binary power generation during normal operation of the condenser according to a fifth embodiment. -
FIG. 14 is a schematic configuration diagram showing the method of cleaning the condenser for binary power generation during cleaning of the condenser according to the fifth embodiment. - Hereinafter, embodiments of the present invention will be described with reference to the drawings. For the purpose of illustration, each of the drawings simply shows major components to be required for describing a system of cleaning a condenser for binary power generation according to each of the embodiments of the present invention. Accordingly, the system of cleaning the condenser for binary power generation according to each embodiment of the present invention can include any components that are not shown in the drawings referred to as by the specification.
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FIG. 1 is a schematic configuration diagram illustrating a binarypower generation system 1 in which a system of cleaning a condenser for binary power generation is used. The binarypower generation system 1 is a power generation system utilizing a Rankine cycle. The binarypower generation system 1 includes acondenser 6, acirculation pump 8, aheater 10, and anexpander 14. Thecondenser 6, thecirculation pump 8, theheater 10, and theexpander 14 are provided in acirculation flow passage 4 in the mentioned order. A circulation circuit is configured in the binarypower generation system 1 such that a working medium flows through thecirculation flow passage 4 via theheater 10, theexpander 14, thecondenser 6 and thecirculation pump 8 in the mentioned order. A cooling medium having a boiling point lower than the boiling point of water is applied as the working medium. - The
circulation pump 8 is provided downstream of the condenser 6 (between theheater 10 and the condenser 6) in thecirculation flow passage 4. Thecirculation pump 8 serves to circulate the working medium in thecirculation flow passage 4. Thecirculation pump 8 pressurizes the liquid working medium condensed in thecondenser 6 to a predetermined pressure and thereafter pumps the working medium to theheater 10. For example, a centrifugal pump provided with an impeller as a rotor or a gear pump including a rotor formed by a pair of gears is applied as thecirculation pump 8. Thecirculation pump 8 is controlled to be driven by acontroller 30. The function of thecontroller 30 includes apump control unit 30 a. Thepump control unit 30 a is configured to control the number of rotations of thecirculation pump 8. Thepump control unit 30 a controls thecirculation pump 8 to be driven so that the degree of superheat of the working medium may fall within a preliminarily-established range. Also, thepump control unit 30 a controls thecirculation pump 8 to start and stop. - The
heater 10 is provided downstream of the circulation pump 8 (between thecirculation pump 8 and the expander 14) in thecirculation flow passage 4. Theheater 10 includes a workingmedium flow passage 10 a through which the working medium flows and a heat sourcemedium flow passage 10 b through which a heat source medium flows. The heat sourcemedium flow passage 10 b is connected to a heat sourcemedium circuit 72. The heat source medium supplied from an external heat source flows through the heat sourcemedium flow passage 10 b. The working medium flowing through the workingmedium flow passage 10 a is heat-exchanged with the heat source medium flowing through the heat sourcemedium flow passage 10 b to evaporate. The heat source medium may include, for example, hot water, water vapor, or the like. - A
generator 16 is connected to theexpander 14. A gaseous working medium is expanded in theexpander 14; thereby, the power to drive thegenerator 16 can be derived. -
FIG. 2 is a schematic configuration diagram illustrating thecondenser 6 applied in a system X1 of cleaning thecondenser 6 for binary power generation. Thecondenser 6 serves to condense the gaseous working medium discharged from theexpander 14 to generate the liquid working medium. Thecondenser 6 includes: aheat exchanger 6 a configured to conduct heat exchange between the working medium and a cooling medium and condense the working medium; aninlet header 6 b for allowing inflow of the cooling medium into theheat exchanger 6 a; and anoutlet header 6 c for allowing outflow of the cooling medium that has flowed through theheat exchanger 6 a. As long as thecondenser 6 is provided with an inlet header to which after-mentioned plural branch ports of theheat exchanger 6 a are opened, any of a plate condenser, a shell-and-tube condenser, and a fin-and-tube condenser can be used as thecondenser 6. - The
heat exchanger 6 a is formed such that working medium flow passages S1 through each of which the gaseous working medium flows and cooling medium flow passages S2 through each of which the cooling medium flows are arranged alternately side by side with each other in an up to down direction. The flow direction of the working medium is different by 90 degrees from the flow direction of the cooling medium. Theheat exchanger 6 a includes:plural branch ports 11 for allowing inflow of the cooling medium from theinlet header 6 b; and pluraljoint ports 12 for allowing outflow of the cooling medium to theoutlet header 6 c. - The
inlet header 6 b is formed to be elongated in a direction perpendicular to the flow direction of the cooling medium. Aninflow port 17 for the cooling medium is formed in asurface 13 of theinlet header 6 b, which is located upstream in the flow direction of the cooling medium. Afirst pipe 18 for allowing the cooling medium from a supply source of the cooling medium into theinlet header 6 b is connected to theinflow port 17. The supply source (not shown) of the cooling medium may include, for example, seawater or river water. Theplural branch ports 11 are provided at intervals and opened to asurface 19 of theinlet header 6 b, which is located downstream in the flow direction of the cooling medium. - The
outlet header 6 c is formed to be elongated in a direction perpendicular to the flow direction of the cooling medium. The pluraljoint ports 12 are opened to asurface 20 of theoutlet header 6 c, which is located upstream in the flow direction of the cooling medium. Anoutflow port 22 for the cooling medium is formed in asurface 21 of theoutlet header 6 c, which is located downstream in the flow direction of the cooling medium. Asecond pipe 23 for allowing the cooling medium to flow out from theoutlet header 6 c into the supply source of the cooling medium is connected to theoutflow port 22. - Here, the operation of the binary
power generation system 1 will be described. When thecirculation pump 8 is driven, the liquid working medium pumped from thecirculation pump 8 flows into the workingmedium flow passage 10 a of theheater 10. The working medium is heated by the heat source medium flowing through the heat sourcemedium flow passage 10 b, therefore evaporating. The working medium evaporated in theheater 10 is supplied into theexpander 14. The working medium is supplied into theexpander 14 and thereby theexpander 14 is rotatably driven. As a result, thegenerator 16 is driven to generate electric power. The working medium expanded in theexpander 14 is discharged into thecirculation flow passage 4. The gaseous working medium discharged from theexpander 14 is supplied into the working medium flow passages S1 of thecondenser 6. In thecondenser 6, the working medium is cooled by the cooling medium flowing through the cooling medium flow passages S2 to be condensed to the liquid working medium. The liquid working medium flows through thecirculation flow passage 4 to be suctioned into thecirculation pump 8. In thecirculation flow passage 4, such circulation is repeated and thereby electric power is generated in thegenerator 16. -
FIG. 3 is a schematic configuration diagram illustrating the system X1 of cleaning thecondenser 6 for binary power generation during normal operation. The system X1 of cleaning thecondenser 6 for binary power generation includes athird pipe 24 and afourth pipe 25. Thethird pipe 24 establishes a connection between thefirst pipe 18 and thesecond pipe 23. Thefourth pipe 25 establishes a connection between a second portion P2 of thefirst pipe 18 and a fourth portion P4 of thesecond pipe 23. The second portion P2 is located downstream, in the flow direction of the cooling medium, of a first portion P1 of thefirst pipe 18 to which thethird pipe 24 is connected. The fourth portion P4 is located downstream, in the flow direction of the cooling medium, of a third portion P3 of thesecond pipe 23 to which thethird pipe 24 is connected. The system X1 of cleaning thecondenser 6 for binary power generation further includes: a switchingunit 26 configured to switch the flow of the cooling medium to a direction from theheat exchanger 6 a to theinlet header 6 b; and astrainer 27 configured to remove foreign substances in the cooling medium from the cooling medium. - The switching
unit 26 includes a first on-offvalve 26 a interposed between the first portion P1 and the second portion P2 of thefirst pipe 18, a second on-offvalve 26 b interposed between the third portion P3 and the fourth portion P4 of thesecond pipe 23, a third on-offvalve 26 c provided in thethird pipe 24, and a fourth on-offvalve 26 d provided in thefourth pipe 25. The switchingunit 26 can switch from a first state where the cooling medium flows from thefirst pipe 18 into thecondenser 6 to a second state where the cooling medium flows from thefirst pipe 18 through thethird pipe 24 and thesecond pipe 23 into thecondenser 6. Specifically, the switchingunit 26 opens the first on-offvalve 26 a and the second on-offvalve 26 b and closes the third on-offvalve 26 c and the fourth on-offvalve 26 d, thereby establishing the first state. The switchingunit 26 closes the first on-offvalve 26 a and the second on-offvalve 26 b and opens the third on-offvalve 26 c and the fourth on-offvalve 26 d, thereby establishing the second state. Manual valves that can manually open and close flow passages of fluid may be applied as the first to fourth on-offvalves 26 a to 26 d. - The system X1 of cleaning the
condenser 6 for binary power generation according to the first embodiment operates as follows. In order to bring the flow of the cooling medium into the first state during normal operation, the first on-offvalve 26 a and the second on-offvalve 26 b are opened by an operator and the third on-offvalve 26 c and the fourth on-offvalve 26 d are closed by the operator. Thus, the flow of the cooling medium is brought into the first state where the cooling medium flows from thefirst pipe 18 into thecondenser 6 and then flows out into thesecond pipe 23. - Here, as show in
FIG. 2 , the force in the flow direction of the cooling medium, i.e. the force in a direction in which foreign substances FS are pushed against thesurface 19 is likely to act on thesurface 19 of theinlet header 6 b, which is located downstream in the flow direction of the cooling medium. Therefore, the foreign substances FS are easily adhered to thesurface 19 of theinlet header 6 b, which is located downstream in the flow direction of the cooling medium. -
FIG. 4 is a schematic configuration diagram illustrating the system X1 of cleaning thecondenser 6 for binary power generation during cleaning of thecondenser 6. When a predetermined time has elapsed during normal operation, in order to bring the flow of the cooling medium into the second state, the first on-offvalve 26 a and the second on-offvalve 26 b are closed by an operator and the third on-offvalve 26 c and the fourth on-offvalve 26 d are opened by the operator. Thus, the cooling medium flows from thefirst pipe 18 through thethird pipe 24 and thesecond pipe 23 into thecondenser 6 and then flows out to thefirst pipe 18. The cooling medium flows out to thefirst pipe 18, thereafter flowing through thefourth pipe 25 to thesecond pipe 23. - At this time, the cooling medium in the
condenser 6 flows in the direction from theheat exchanger 6 a to theinlet header 6 b, as shown inFIG. 2 . Accordingly, the force in such a direction to separate the foreign substances FS from thebranch ports 11 acts on the foreign substances FS adhered to the periphery of thebranch ports 11 in thesurface 19 of theinlet header 6 b, which is located downstream in the flow direction of the cooling medium. Therefore, the foreign substances FS adhered to the periphery of thebranch ports 11 in thesurface 19 of theinlet header 6 b, which is located downstream in the flow direction of the cooling medium easily separate from the periphery of thebranch ports 11. Consequently, the foreign substances FS can be removed without disassembling thecondenser 6. - The foreign substances FS separated from the periphery of the
branch ports 11 are discharged together with the cooling medium into thefirst pipe 18, thereafter flowing through thefourth pipe 25. At this time, the foreign substances FS in the cooling medium are removed from the cooling medium by thestrainer 27. Therefore, the foreign substances FS are easily removed. - Next, a cleaning system X2 for the
condenser 6 for binary power generation according to a second embodiment will be described with reference toFIG. 5 andFIG. 6 . In the second embodiment, only differences from the first embodiment will be described, and the same configurations as those of the first embodiment will be assigned with the same reference numbers and thus will not be described. -
FIG. 5 is a schematic configuration diagram illustrating the system X2 of cleaning thecondenser 6 for binary power generation during normal operation.FIG. 6 is a schematic configuration diagram illustrating the system X2 of cleaning thecondenser 6 for binary power generation during cleaning of thecondenser 6. The system X2 of cleaning thecondenser 6 for binary power generation according to the second embodiment includes afirst pressure meter 31, asecond pressure meter 32, a switchingunit 33, and acontrol unit 34. The switchingunit 33 of the second embodiment is different from that of the first embodiment where manual valves for manually opening and closing flow passages of fluid are used in that automatic valves for opening and closing flow passages of fluid on the basis of an electric signal are used. Other configurations of the switchingunit 33 of the second embodiment are similar to the configurations of the first embodiment. - The
first pressure meter 31 includes a first pressure sensor (not shown) for measuring the pressure of the cooling medium flowing from thefirst pipe 18 into thecondenser 6. Thefirst pressure meter 31 is provided in thefirst pipe 18. Thesecond pressure meter 32 includes a second pressure sensor (not shown) for measuring the pressure of the cooling medium flowing out of thecondenser 6. Thesecond pressure meter 32 is provided in thesecond pipe 23. Pressure values measured by the first pressure sensor and the second pressure sensor are output therefrom as electric signals to thecontrol unit 34. - When a pressure difference between a pressure value measured by the
first pressure meter 31 and a pressure value measured by thesecond pressure meter 32 has exceeded a predetermined value, thecontrol unit 34 controls the switchingunit 33 to switch so that the flow of the cooling medium is brought into the second state. Further, when a pressure difference between a pressure value measured by thefirst pressure meter 31 and a pressure value measured by thesecond pressure meter 32 has reached a value smaller than or equal to the predetermined value, thecontrol unit 34 controls the switchingunit 33 to switch so that the flow of the cooling medium is brought into the first state. The predetermined value can be set accordingly in consideration of, for example, the pressure of a pump for pumping the cooling medium and a pressure loss and on the basis of a pressure difference assumed when the flow passage for the cooling medium in thecondenser 6 is actually blocked. For example, the predetermined value can be set to a pressure difference generated when a pressure value measured by thesecond pressure meter 32 has been half a pressure value measured by thefirst pressure meter 31. -
FIG. 7 is a diagram illustrating the control operation of thecontrol unit 34 in the system X2 of cleaning thecondenser 6 for binary power generation. Thecontrol unit 34 receives electric signals from the first pressure sensor and the second pressure sensor (step ST1). Thecontrol unit 34 receives the electric signals in step ST1 and thereafter subtracts a pressure value measured by the second pressure sensor from a pressure value measured by the first pressure sensor; thereby computing a pressure difference (step ST2). Thecontrol unit 34 computes the pressure difference and thereafter determines whether the pressure difference is smaller than or equal to the predetermined value. When thecontrol unit 34 has determined that the pressure difference is smaller than or equal to the predetermined value (Yes in step ST3), the processing goes to step ST4. On the other hand, when thecontrol unit 34 has determined that the pressure difference is larger than the predetermined value (No in step ST3), the processing goes to step ST6. - In step ST4, the
control unit 34 determines whether the flow of the cooling medium is presently in the first state. When thecontrol unit 34 has determined that the flow of the cooling medium is presently in the first state (Yes in step ST4), the processing returns to step ST1. On the other hand, when thecontrol unit 34 has determined that the flow of the cooling medium is presently in the second state (No in step ST4), the processing goes to step ST5. In step ST5, thecontrol unit 34 sends to the first to fourth on-offvalves 26 a to 26 d control signals for switching the flow of the cooling medium to the first state (step ST5). In other words, thecontrol unit 34 sends to the first on-offvalve 26 a and the second on-offvalve 26 b the control signals for opening the flow passage for the cooling medium and sends to the third on-offvalve 26 c and the fourth on-offvalve 26 d the control signals for closing the flow passage for the cooling medium. Accordingly, the flow passage for the cooling medium is opened by the first on-offvalve 26 a and the second on-offvalve 26 b and the flow passage for the cooling medium is closed by the third on-offvalve 26 c and the fourth on-offvalve 26 d. Thus, the flow of the cooling medium is switched from the second state to the first state. When the flow of the cooling medium has been switched from the second state to the first state, thecontrol unit 34 returns the processing to step ST1 (step ST5). - In step ST6, the
control unit 34 determines whether the flow of the cooling medium is presently in the second state. When thecontrol unit 34 has determined that the flow of the cooling medium is presently in the second state (Yes in step ST6), the processing returns to step ST1. On the other hand, when thecontrol unit 34 has determined that the flow of the cooling medium is presently in the first state (No in step ST6), the processing goes to step ST7. In step ST7, thecontrol unit 34 sends to the first to fourth on-offvalves 26 a to 26 d control signals for switching the flow of the cooling medium to the second state (step ST7). In other words, thecontrol unit 34 sends to the first on-offvalve 26 a and the second on-offvalve 26 b the control signals for closing the flow passage for the cooling medium and sends to the third on-offvalve 26 c and the fourth on-offvalve 26 d the control signals for opening the flow passage for the cooling medium. Accordingly, the flow passage for the cooling medium is closed by the first on-offvalve 26 a and the second on-offvalve 26 b and the flow passage for the cooling medium is opened by the third on-offvalve 26 c and the fourth on-offvalve 26 d. Thus, the flow of the cooling medium is switched from the first state to the second state. When the flow of the cooling medium has been switched from the first state to the second state, thecontrol unit 34 returns the processing to step ST1 (step ST7). Thecontrol unit 34 repeats the processing of steps ST1 to ST7 until a power supply of the system X2 of cleaning thecondenser 6 for binary power generation according to the second embedment is turned off - If the flow passage for the cooling medium in the
condenser 6 is blocked, the system X2 of cleaning thecondenser 6 for binary power generation according to the second embodiment is automatically switched to the second state where the cooling medium flows from thefirst pipe 18 through thethird pipe 24 and thesecond pipe 23 into thecondenser 6. Therefore, foreign substances FS adhered to the periphery of thebranch ports 11 are automatically separated. Consequently, the foreign substances FS can be removed without disassembling thecondenser 6. - When a pressure difference between a pressure value measured by the
first pressure meter 31 and a pressure value measured by thesecond pressure meter 32 has reached a value smaller than or equal to the predetermined value, the system X2 of cleaning thecondenser 6 for binary power generation according to the second embodiment is automatically switched to the first state where the cooling medium flows from thefirst pipe 18 via thecondenser 6 to thesecond pipe 23. Therefore, when the blocking of the flow passage for the cooling medium in thecondenser 6 is solved, an operator does not need to perform the switching operation to the first state. - The system X2 of cleaning the
condenser 6 for binary power generation according to the second embodiment includes thecontrol unit 34. Alternatively, the cleaning system X2 may not include thecontrol unit 34. In this case, an operator determines on the basis of a pressure difference between a pressure value measured by thefirst pressure meter 31 and a pressure value measured by thesecond pressure meter 32 whether the flow passage for the cooling medium in thecondenser 6 is blocked. If the operator has determined that the flow passage for the cooling medium in thecondenser 6 is blocked, the operator manually performs the switching operation of the first to fourth on-offvalves 26 a to 26 d so that the flow of the cooling medium is brought into the second state. Likewise, if the operator has determined on the basis of the pressure difference that the blocking of the flow passage for the cooling medium in thecondenser 6 is solved, the operator manually performs the switching operation of the first to fourth on-offvalves 26 a to 26 d so that the flow of the cooling medium is brought into the first state. In this case, manual valves are applied as the first to fourth on-offvalves 26 a to 26 d. - The
control unit 34 controls to switch between the first state and the second state on the basis of the pressure difference. Alternatively, thecontrol unit 34 may control to switch between the first state and the second state on the basis of a pressure ratio. -
FIG. 8 is a schematic configuration diagram illustrating a system X3 of cleaning thecondenser 6 for binary power generation during normal operation.FIG. 9 is a schematic configuration diagram illustrating the system X3 of cleaning thecondenser 6 for binary power generation during cleaning of thecondenser 6. The system X3 of cleaning thecondenser 6 for binary power generation according to the third embodiment includes, in place of thefirst pressure meter 31 and thesecond pressure meter 32 of the second embodiment, afirst thermometer 41 for measuring the temperature of the cooling medium flowing from thefirst pipe 18 into thecondenser 6 and asecond thermometer 42 for measuring the temperature of the cooling medium flowing out of thecondenser 6. The system X3 of cleaning thecondenser 6 for binary power generation according to the third embodiment further includes acontrol unit 43 in place of thecontrol unit 34 of the second embodiment. Other configurations of the third embodiment are similar to the configurations of the second embodiment and thus will be assigned with the same reference numbers as the second embodiment and will not be described. - The
first thermometer 41 includes a first temperature sensor (not shown) for measuring the temperature of the cooling medium flowing from thefirst pipe 18 into thecondenser 6. Thefirst thermometer 41 is provided in thefirst pipe 18. Thesecond thermometer 42 includes a second temperature sensor (not shown) for measuring the temperature of the cooling medium flowing out of thecondenser 6. Thesecond thermometer 42 is provided in thesecond pipe 23. The temperatures measured by the first temperature sensor and the second temperature sensor are output therefrom as electric signals to thecontrol unit 43. - When a temperature difference between the temperature measured by the
first thermometer 41 and the temperature measured by thesecond thermometer 42 has exceeded a predetermined value, thecontrol unit 43 controls the switchingunit 33 to switch so that the flow of the cooling medium is brought into the second state. Further, when a temperature difference between the temperature measured by thefirst thermometer 41 and the temperature measured by thesecond thermometer 42 has reached a value smaller than or equal to the predetermined value, thecontrol unit 43 controls the switchingunit 33 to switch so that the flow of the cooling medium is brought into the first state. The predetermined value can be set accordingly in consideration of, for example, the specific heat of the cooling medium and the temperature of the working medium to be heat-exchanged with the cooling medium and on the basis of a temperature difference assumed when the flow passage for the cooling medium in thecondenser 6 is actually blocked. For example, the predetermined value can be set to a pressure difference generated when the temperature measured by thesecond thermometer 42 has become twice as high as the temperature measured by thefirst thermometer 41. -
FIG. 10 is a diagram illustrating the control operation of thecontrol unit 43 in the system X3 of cleaning thecondenser 6 for binary power generation. When receiving the electric signals from the first temperature sensor and the second temperature sensor, thecontrol unit 43 subtracts the temperature value measured by the first temperature sensor from the temperature measured by the second temperature sensor to compute a temperature difference (step ST8). Other steps of the third embodiment are similar to the steps of the second embodiment and thus will not be described. - According to the system X3 of cleaning the
condenser 6 for binary power generation according to the third embodiment, when a temperature difference between the temperature measured by thefirst thermometer 41 and the temperature measured by thesecond thermometer 42 has exceeded the predetermine value, the flow of the cooling medium is automatically switched to the second state. Accordingly, foreign substances FS adhered to the periphery of thebranch ports 11 are automatically separated therefrom; therefore, the foreign substances can be removed without disassembling thecondenser 6. - According to the system X3 of cleaning the
condenser 6 for binary power generation according to the third embodiment, when a temperature difference between the temperature measured by thefirst thermometer 41 and the temperature measured by thesecond thermometer 42 has reached a value smaller than or equal to the predetermine value, the flow of the cooling medium is automatically switched to the first state. Accordingly, when the blocking of the flow passage for the cooling medium in thecondenser 6 is solved, an operator does not need to perform switching operation to the first state. - The system X3 of cleaning the
condenser 6 for binary power generation according to the third embodiment includes thecontrol unit 34. Alternatively, the system X3 may not include thecontrol unit 34. In this case, an operator performs the switching operation from the first state to the second state in the same way as in the case of the second embodiment where thecontrol unit 34 is not provided. - In the system X2 of cleaning the
condenser 6 for binary power generation according to the second embodiment, the predetermined value is set on the basis of a pressure difference, and in the system X3 of cleaning thecondenser 6 for binary power generation according to the third embedment, the predetermined value is set on the basis of a temperature difference. Alternatively, each of the predetermine values may be set on the basis of a difference between flow rates. In this case, a first flowmeter (not shown) for measuring the flow rate of the cooling medium flowing from thefirst pipe 18 into thecondenser 6 and a second flowmeter (not shown) for measuring the flow rate of the cooling medium flowing out of thecondenser 6 are provided. -
FIG. 11 is a schematic configuration diagram illustrating a system X4 of cleaning thecondenser 6 for binary power generation during normal operation of thecondenser 6. The system X4 of cleaning thecondenser 6 for binary power generation according to a fourth embodiment is different from the system X1 according to the first embodiment in that three-way valves are applied as aswitching unit 51 for reversing the flow direction of the cooling medium in thecondenser 6. Other configurations of the fourth embodiment are similar to the configurations of the first embodiment and thus will be assigned with the same reference numbers as the first embodiment and will not be described. - The switching
unit 51 includes: a first three-way valve 51 a provided on the first portion P1 in thefirst pipe 18; and a second three-way valve 51 b provided on the fourth portion P4 in thesecond pipe 23. The first three-way valve 51 a is configured to open and close the flow passage of thefirst pipe 18 and to open and close the flow passage of thethird pipe 24. The second three-way valve 51 b is configured to open and close the flow passage of thesecond pipe 23 and to open and close the flow passage of thefourth pipe 25. - The system X4 of cleaning the
condenser 6 for binary power generation according to the fourth embodiment operates as follows. In order that the flow of the cooling medium is brought into the first state during normal operation, firstly, an operator opens the flow passage of thefirst pipe 18 of the first three-way valve 51 a and closes the flow passage of thethird pipe 24, and in addition, the operator opens the flow passage of thesecond pipe 23 of the second three-way valve 51 b and closes the flow passage of thefourth pipe 25. Thus, the system X4 of cleaning thecondenser 6 for binary power generation according to the fourth embodiment is brought into the first state where the cooling medium flows from thefirst pipe 18 into thecondenser 6 and then flows out to thesecond pipe 23. -
FIG. 12 is a schematic configuration diagram illustrating the system X4 of cleaning thecondenser 6 for binary power generation. When a predetermined time has elapsed during normal operation, in order to bring the flow of the cooling medium into the second state, an operator closes the flow passage of thefirst pipe 18 of the first three-way valve 51 a and opens the flow passage of thethird pipe 24, and in addition, the operator closes the flow passage of thesecond pipe 23 of the second three-way valve 51 b and opens the flow passage of thefourth pipe 25. Thus, the system X4 of cleaning thecondenser 6 for binary power generation according to the fourth embodiment is brought into the second state where the cooling medium flows from thefirst pipe 18 through thethird pipe 24 and thesecond pipe 23 into thecondenser 6. - The system X4 of cleaning the
condenser 6 for binary power generation according to the fourth embodiment is configured to switch between the first state and the second state by two valves, that is, the first three-way valve 51 a and the second three-way valve 51 b; therefore, the switching operation is easy compared to the foregoing first to third embodiments. -
FIG. 13 is a schematic configuration diagram illustrating a method of cleaning thecondenser 6 for binary power generation during normal operation of thecondenser 6. The method of cleaning thecondenser 6 for binary power generation of a fifth embodiment is different from that of the first embodiment in that thethird pipe 24 and thefourth pipe 25 are not provided during normal operation. Furthermore, the method of cleaning thecondenser 6 for binary power generation according to the fifth embodiment is different from that of the first embodiment in that aswitching unit 61 is provided in place of the switchingunit 26 of the first embodiment. Other configurations of the fifth embodiment are similar to the configurations of the first embodiment and thus will be assigned with the same reference numbers as the first embodiment and will not be described. - A cleaning system X5 used in the method of cleaning the
condenser 6 for binary power generation according to the fifth embodiment includes: a firstbranched pipe 62 branched from thefirst pipe 18 and provided with a first joint 62 a at an end thereof; and a secondbranched pipe 63 branched from thesecond pipe 23 and provided with a second joint 63 a at an end thereof. The cleaning system X5 used in the method of cleaning thecondenser 6 for binary power generation according to the fifth embodiment includes a thirdbranched pipe 64 branched from the second portion P2. The second portion P2 is located downstream, in the flow direction of the cooling medium, of the first portion P1 of thefirst pipe 18 on which the firstbranched pipe 62 is located. A third joint 64 a is provided at an end of the thirdbranched pipe 64. The cleaning system X5 used in the method of cleaning thecondenser 6 for binary power generation according to the fifth embodiment includes a fourthbranched pipe 65 branched from the fourth portion P4. The fourth portion P4 is located downstream, in the flow direction of the cooling medium, of the third portion P3 of thesecond pipe 23 on which the secondbranched pipe 63 is located. A fourth joint 65 a is provided at an end of the fourthbranched pipe 65. - The switching
unit 61 includes: a fifth on-offvalve 61 a interposed between the first portion P1 and the second portion P2 of thefirst pipe 18; and a sixth on-offvalve 61 b interposed between the third portion P3 and the fourth portion P4 of thesecond pipe 23. - In the method of cleaning the
condenser 6 for binary power generation according to the fifth embodiment, an operator opens the fifth on-offvalve 61 a and closes the sixth on-offvalve 61 b so that the flow of the cooling medium is brought into the first state during normal operation. Thus, the cleaning system X5 used in the method of cleaning thecondenser 6 for binary power generation according to the fifth embodiment is brought into the first state where the cooling medium flows from thefirst pipe 18 into thecondenser 6 and flows out to thesecond pipe 23. At this time, the first tofourth joints 62 a to 65 a of the first to fourthbranched pipes 62 to 65 are closed; therefore, no cooling medium flows out of the first to fourthbranched pipes 62 to 65. -
FIG. 14 is a schematic configuration diagram illustrating the method of cleaning thecondenser 6 for binary power generation during cleaning of thecondenser 6. When a predetermined time has elapsed during normal operation, an operator performs the following first to fourth steps to bring the flow of the cooling medium into the second state. - Firstly, the operator stops a pump (not shown) provided upstream in the
first pipe 18 to stop the flow of the cooling medium. Next, the operator performs the first step of connecting the firstbranched pipe 62 through thethird pipe 24 to the secondbranched pipe 63 via the first joint 62 a and via the second joint 63 a. After the first step, the operator performs the second step of connecting the thirdbranched pipe 64 through thefourth pipe 25 to the fourthbranched pipe 65 via the third joint 64 a and via the fourth joint 65 a. After the second step, the operator performs the third step of closing the fifth on-offvalve 61 a and the sixth on-offvalve 61 b. Finally, the operator activates the pump (not shown) provided upstream in thefirst pipe 18 to flow the cooling medium. - Accordingly, the flow of the cooling medium is stopped between the first portion P1 and the second portion P2 of the
first pipe 18 and between the third portion P3 and the fourth portion P4 of thesecond pipe 23. Therefore, the cooling medium flows through thefirst pipe 18, the firstbranched pipe 62, thethird pipe 24, the secondbranched pipe 63, thesecond pipe 23, thecondenser 6, thefirst pipe 18, the thirdbranched pipe 64, thefourth pipe 25, the fourthbranched pipe 65, and thesecond pipe 23 in the mentioned order. Thus, the flow of the cooling medium is switched to the second state; therefore, cleaning of thecondenser 6 is performed. - After a predetermined time has elapsed during cleaning of the condenser, in order to switch the flow of the cooling medium to the first state, the operator stops the pump (not shown) provided upstream in the
first pipe 18 to stop the flow of the cooling medium. Thereafter, the operator removes thethird pipe 24 and thefourth pipe 25 and closes the first tofourth joints 62 a to 65 a. Finally, the operator activates the pump (not shown) provided upstream in thefirst pipe 18 to flow the cooling medium. Thus, the operator switches the flow of the cooling medium from the second state to the first state. - According to the method of cleaning the
condenser 6 for binary power generation of the fifth embodiment, the first to third steps are performed; thereby, the flow of the cooling medium can be switched to a direction from theheat exchanger 6 a to theinlet header 6 b. Accordingly, the force in a direction to separate foreign substances from thebranch ports 11 can be applied to the foreign substances adhered to the periphery of thebranch ports 11. Therefore, the foreign substances adhered to the periphery of thebranch ports 11 are easily separated therefrom. Consequently, the foreign substances can be removed without disassembling thecondenser 6. - According to the method of cleaning the
condenser 6 for binary power generation of the fifth embodiment, as long as the blocking of the flow passage for the cooling medium in thecondenser 6 does not occur, the operator may not have to perform the first step to the third step. Therefore, the method of cleaning thecondenser 6 for binary power generation of the fifth embodiment can reduce installation costs. - According to the method of cleaning the
condenser 6 for binary power generation of the fifth embodiment, respective on-off valves (not shown) for opening and closing the flow passage for the cooling medium may be provided in the first to fourthbranched pipes 62 to 65. Therefore, in a state where the on-off valves are closed, an operator can connect thethird pipe 24 to the firstbranched pipe 62 and the secondbranched pipe 63 without stopping the flow of the cooling medium. Likewise, the operator can connect thefourth pipe 25 to the thirdbranched pipe 64 and the fourthbranched pipe 65 without stopping the flow of the cooling medium. - In the foregoing embodiments, the
strainer 27 for removing the foreign substances FS in the cooling medium from the cooling medium is provided in thefourth pipe 25. Alternatively, thestrainer 27 may not be provided. In this case, the foreign substances FS in the cooling medium are released together with the cooling medium into the sea or the river. Therefore, marine organisms adhered to the inside of thecondenser 6 will be returned into the sea or the like, which is environmentally friendly.
Claims (13)
1. A system of cleaning a condenser for binary power generation, the condenser being provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system, wherein
the condenser comprises:
an inlet header into which a cooling medium flows; and
a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header, the heat exchanger being configured to perform heat exchange between the working medium and the cooling medium to condense the working medium, and
the cleaning system comprises a switching unit configured to switch a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
2. The system of cleaning the condenser for binary power generation according to claim 1 , comprising:
a third pipe adapted to connect a first pipe for allowing the cooling medium to flow into the inlet header of the condenser, to a second pipe for allowing the cooling medium to flow out of the condenser; and
a fourth pipe adapted to connect a second portion of the first pipe to a fourth portion of the second pipe, the second portion being located downward, in a flow direction of the cooling medium, of a first portion of the first pipe to which the third pipe is connected, the fourth portion being located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe to which the third pipe is connected,
wherein the switching unit switches from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
3. The system of cleaning the condenser for binary power generation according to claim 2 , comprising a strainer provided in the fourth pipe and configured to remove foreign substances in the cooling medium from the cooling medium.
4. The system of cleaning the condenser for binary power generation according to claim 2 , comprising:
a first pressure meter provided in the first pipe and configured to measure a pressure of the cooling medium flowing from the first pipe into the condenser; and
a second pressure meter provided in the second pipe and configured to measure a pressure of the cooling medium flowing out of the condenser.
5. The system of cleaning the condenser for binary power generation according to claim 4 , comprising
a control unit configured to, when a difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has exceeded a predetermined value, control the switching unit to establish the second state.
6. The system of cleaning the condenser for binary power generation according to claim 5 , wherein the control unit is configured to, when a difference between a pressure value measured by the first pressure meter and a pressure value measured by the second pressure meter has reached a value smaller than or equal to the predetermined value, control the switch means to establish the first state.
7. The system of cleaning the condenser for binary power generation according to claim 2 , comprising:
a first thermometer provided in the first pipe and configured to measure a temperature of the cooling medium flowing from the first pipe into the condenser; and
a second thermometer provided in the second pipe and configured to measure a temperature of the cooling medium flowing out of the condenser.
8. The system of cleaning the condenser for binary power generation according to claim 7 , comprising
a control unit configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has exceeded a predetermined value, control the switching unit to establish the second state.
9. The system for the condenser for binary power generation according to claim 8 , wherein the control unit is configured to, when a temperature difference between a temperature measured by the first thermometer and a temperature measured by the second thermometer has reached a value smaller than or equal to the predetermined value, control the switching unit to establish the first state.
10. A method of cleaning a condenser for binary power generation, the condenser being provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system, wherein
the condenser comprises:
an inlet header into which a cooling medium flows; and
a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header, the heat exchanger being configured to perform heat exchange between the working medium and the cooling medium to condense the working medium, and
the cleaning method comprises the step of switching a flow of the cooling medium to a direction from the heat exchanger to the inlet header.
11. The method of cleaning the condenser for binary power generation according to claim 10 , comprising:
a first branched pipe branched from a first pipe for allowing the cooling medium to flow into the inlet header of the condenser, the first branched pipe including a first joint at an end thereof;
a second branched pipe branched from a second pipe for allowing the cooing medium to flow out of the condenser, the second branched pipe including a second joint at an end thereof;
a third branched pipe branched from a second portion of the first pipe, which is located downstream, in a flow direction of the cooling medium, of a first portion of the first pipe from which the first branched pipe is branched, the third branched pipe including a third joint at an end thereof;
a fourth branched pipe branched from a fourth portion of the second pipe, which is located downstream, in the flow direction of the cooling medium, of a third portion of the second pipe from which the second branched pipe is branched, the fourth branched pipe including a fourth joint at an end thereof; and
a switching unit configured to stop the flow of the cooling medium between the first portion and the second portion of the first pipe and to stop the flow of the cooling medium between the third portion and the fourth portion of the second pipe, wherein
the method comprises:
a first step of connecting the first branched pipe through the third pipe to the second branched pipe via the first joint and via the second joint;
a second step of connecting the third branched pipe through the fourth pipe to the fourth branched pipe via the third joint and via the fourth joint; and
a third step of switching by the switching unit from a first state where the cooling medium flows from the first pipe into the condenser to a second state where the cooling medium flows from the first pipe through the third pipe and the second pipe into the condenser.
12. The system of cleaning the condenser for binary power generation according to claim 3 , comprising:
a first pressure meter provided in the first pipe and configured to measure a pressure of the cooling medium flowing from the first pipe into the condenser; and
a second pressure meter provided in the second pipe and configured to measure a pressure of the cooling medium flowing out of the condenser.
13. The system of cleaning the condenser for binary power generation according to claim 3 , comprising:
a first thermometer provided in the first pipe and configured to measure a temperature of the cooling medium flowing from the first pipe into the condenser; and
a second thermometer provided in the second pipe and configured to measure a temperature of the cooling medium flowing out of the condenser.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016193210A JP2018054254A (en) | 2016-09-30 | 2016-09-30 | Cleaning system of condenser for binary power generation and cleaning method of condenser for binary power generation |
JP2016-193210 | 2016-09-30 |
Publications (1)
Publication Number | Publication Date |
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US20180094885A1 true US20180094885A1 (en) | 2018-04-05 |
Family
ID=61757022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/713,794 Abandoned US20180094885A1 (en) | 2016-09-30 | 2017-09-25 | System and method of cleaning condenser for binary power generation |
Country Status (4)
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US (1) | US20180094885A1 (en) |
JP (1) | JP2018054254A (en) |
KR (1) | KR20180036577A (en) |
CN (1) | CN107883806A (en) |
Cited By (3)
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WO2021245034A1 (en) * | 2020-06-05 | 2021-12-09 | Empig As | Method, system and apparatus for hydrocarbon flow system fluid cooling |
CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
EP4148348A1 (en) * | 2021-09-09 | 2023-03-15 | SHR GmbH | Method and apparatus for controlling the cleaning and cooling process of heat exchangers |
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JP5196460B2 (en) * | 2004-08-25 | 2013-05-15 | 勢一郎 笹原 | Skeleton type water purifier |
JP4869086B2 (en) * | 2007-01-19 | 2012-02-01 | 中国電力株式会社 | Condenser cooling pipe reverse cleaning system and cleaning method thereof |
KR20100092112A (en) * | 2009-02-12 | 2010-08-20 | 서진욱 | Cooler of air conditioning systemm |
KR101109014B1 (en) * | 2009-04-28 | 2012-01-31 | 삼오기계공업주식회사 | A Pipe Connector for Automatic Back Washing of Filter |
CN201607162U (en) * | 2009-12-17 | 2010-10-13 | 山东省鲁洲食品集团有限公司 | Plate-type heat exchanger device capable of automatically reversely washing on line |
CN201589576U (en) * | 2010-01-15 | 2010-09-22 | 浙江日风电气有限公司 | Back-washing system of plate type heat exchanger |
JP2011237150A (en) * | 2010-05-13 | 2011-11-24 | Chugoku Electric Power Co Inc:The | Bearing cooling-water cooler system |
JP5592305B2 (en) * | 2011-04-15 | 2014-09-17 | 株式会社神戸製鋼所 | Power generator |
JP5871661B2 (en) * | 2012-02-29 | 2016-03-01 | 株式会社神戸製鋼所 | Binary power generator control method |
KR101495741B1 (en) * | 2013-10-23 | 2015-02-26 | 한국에너지기술연구원 | Sea water heat pump system using backwash |
CN203848750U (en) * | 2014-06-03 | 2014-09-24 | 薛凤臣 | Back flushing circulating device of circulating water cooler |
CN204007194U (en) * | 2014-08-18 | 2014-12-10 | 广东汇嵘节能服务有限公司 | Heat conduction steam-water heat exchanging equipment |
CN205066558U (en) * | 2015-10-19 | 2016-03-02 | 广州鹿山新材料股份有限公司 | Condensation device's self -cleaning device |
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2016
- 2016-09-30 JP JP2016193210A patent/JP2018054254A/en active Pending
-
2017
- 2017-09-25 US US15/713,794 patent/US20180094885A1/en not_active Abandoned
- 2017-09-27 KR KR1020170124992A patent/KR20180036577A/en not_active Application Discontinuation
- 2017-09-29 CN CN201710907265.3A patent/CN107883806A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021245034A1 (en) * | 2020-06-05 | 2021-12-09 | Empig As | Method, system and apparatus for hydrocarbon flow system fluid cooling |
EP4148348A1 (en) * | 2021-09-09 | 2023-03-15 | SHR GmbH | Method and apparatus for controlling the cleaning and cooling process of heat exchangers |
CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
Also Published As
Publication number | Publication date |
---|---|
KR20180036577A (en) | 2018-04-09 |
JP2018054254A (en) | 2018-04-05 |
CN107883806A (en) | 2018-04-06 |
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