JP2016113989A - Retained water determination device and cogeneration system having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retained water determination device which can detect that a water-sealed part in which drain water is temporarily retained is generated in a trap pipe which can trap the drain such as condensed water by a simple constitution, and a cogeneration system having the same.SOLUTION: A retained water determination device comprises: an upstream pipe 31 having conductivity; a downstream pipe 32 having conductivity; a first joint member 33 which has an electrical insulation property, and connects the upstream pipe 31 and the downstream pipe 32; a first electrode part 52 which can be electrified to the upstream pipe 31; and a second electrode part 53 which can be electrified to the downstream pipe 32. The first joint member 33 connects the upstream pipe 31 and the downstream pipe 32 in a state that an upstream-side opening end 320 of the downstream pipe 32 and a downstream-side opening end 310 of the upstream pipe 31 are separated from each other. Determination means is connected to the first electrode part 52 and the second electrode part 53 so as to be electrified, and determines whether or not the first electrode part 52 and the second electrode part 53 are in electrified states.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stagnant water determination device capable of trapping condensed water contained in exhaust gas of an internal combustion engine.

  Conventionally, a drain pipe for trapping drain water such as condensed water generated in an exhaust pipe is connected to an exhaust pipe through which exhaust from an internal combustion engine or the like flows. This drain pipe is configured by connecting a downwardly convex U-shaped part and an upwardly convex inverted U-shaped part. When the drain water stays in the downwardly convex U-shaped portion, the drain pipe is sealed with the drain water, and therefore it is possible to prevent the exhaust from flowing out through the drain pipe. When the water level rises and reaches the top of the convex U-shaped part, the accumulated drain water constituting the water sealing part passes over the top and flows down to the outside and is drained.

  Thus, forming the water seal portion in the drain pipe at the time of exhaust discharge is inherently important for preventing the exhaust from flowing out through the drain pipe for discharging drain water. If the exhaust pressure in the drain pipe becomes too high, the drained water is pushed out of the water seal portion due to the exhaust pressure and is cut off. In order to prevent this, conventionally, an exhaust pressure switch is provided in the drain pipe, and the system is stopped when the exhaust pressure rises above a certain value.

  As an apparatus for detecting the level of stagnant water in a downwardly convex U-shaped pipe, an apparatus disclosed in Patent Document 1 is known. This water level detection device is mounted on a trap structure used in a drainage section of a biohazard clean room or the like. Two contact points are provided at the same height on the vertical part of the U-tube part projecting downward, these contact points pass through the inside and outside of the U-tube part, and the inner ends face each other inside the U-tube part However, the outer end is exposed to the outside of the U-shaped tube portion. Two sets of contacts having the same configuration as such a set of contact points are further provided in the vertical portion of the downwardly convex U-shaped tube portion with a space therebetween. Each of these contacts is installed in close contact with the U-shaped tube portion so that the accumulated water does not leak from the attachment position of each contact.

  A contact ring that is coaxial with the U-shaped tube portion is arranged outside the contact points of each of the three sets that are provided at intervals in the vertical direction. The contact ring is configured such that a pair of contacts provided on the inner peripheral surface thereof can selectively contact the outer ends of the respective contacts. That is, the contact ring is attached so that it can be selectively brought into contact with each contact by moving in the axial direction of the U-shaped tube portion to a position corresponding to each contact of each set. This contact is connected to the alarm via a signal cable.

  The alarm is configured to issue an alarm by detecting a current change between the pair of contacts. For example, if the water level of the accumulated water is high enough, the alarm detects a current value indicating that the uppermost contact with which the contactor is in contact is energized, and the contact between all sets of contacts Electricity is supplied through the staying water. When the water level of the staying water drops, the contact point where the contactor touched is exposed above the surface of the water, so the current between the contact points changes, and the alarm device detects this and issues an alarm. become.

JP 58-11002 A

  In the prior art described above, an expensive detection device called an exhaust pressure switch is required to detect the presence or absence of a water seal in the drain pipe. In addition, when the water seal portion is not originally formed in the drain pipe, the exhaust pressure does not rise, so that there is a problem that the presence of the water seal portion cannot be detected by the exhaust pressure switch.

  In the apparatus disclosed in Patent Document 1, components such as contacts and contact rings are necessary, and a seal structure for preventing water leakage is necessary between each contact and the mounting position of the U-shaped tube portion. Therefore, the configuration for detecting the water level becomes complicated. Furthermore, although the apparatus of patent document 1 can detect the water level of three steps height by changing a contact ring, it must act to change the attachment position of a contact ring for that purpose.

  Therefore, the present invention has been made in view of the above-described problems, and it is easy to understand that a water seal portion in which drainage is temporarily accumulated is generated in a trap pipe that can trap drainage such as condensed water. It is an object of the present invention to provide a stagnant water determination device that can be detected with a simple configuration and a cogeneration system including the same.

  The present invention employs the following technical means to achieve the above object. It should be noted that the reference numerals in parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and the technical scope of the present invention is as follows. It is not limited.

One of the disclosed inventions is that the drain water staying in the drain pipe (3) that communicates with the exhaust pipe (15) through which the exhaust exhausted from the internal combustion engine (1) flows, and that can detect the drain water staying in the drain pipe. An invention relating to a water determination device,
An upstream pipe (31) having electrical conductivity and extending downward from the exhaust pipe side;
An upstream opening end (320) that is electrically conductive and is located on the upstream pipe side is provided apart from the downstream opening end (310) of the upstream pipe, extends downward from the upstream opening end, and A downstream pipe (32; 32A, 32B) that constitutes a downwardly convex passage so as to be folded upward;
A first joint member (33; 133) having electrical insulation and connecting the upstream pipe and the downstream pipe in a state where the upstream opening end of the downstream pipe and the downstream opening end of the upstream pipe are separated from each other;
A first electrode portion (52) installed to be energized to the upstream pipe;
A second electrode portion (53) installed to be energized to the downstream pipe;
Determining means (50) for determining whether or not the first electrode portion and the second electrode portion are energized by being connected to each of the first electrode portion and the second electrode portion; ,
With
When the first electrode part and the second electrode part are in an energized state, the determination means is configured such that the water level staying in the downstream pipe is equal to or higher than the downstream opening end of the upstream pipe. If the first electrode portion and the second electrode portion are in a non-energized state, the water level staying in the downstream pipe is higher than the downstream opening end of the upstream pipe. It is determined to be in a lower position.

  According to the present invention, the drain pipe for connecting the conductive upstream pipe and the downstream pipe by the electrically insulating joint member while maintaining the electrical insulation relationship is configured, and depending on whether both pipes are energized or not energized. Thus, the level of the accumulated water can be detected in at least two stages. In addition, by detecting the non-energized state of the electrodes provided in each pipe by utilizing the conductivity of drain water, the water seal part of the drain pipe is not sufficient or does not exist with a simple configuration Can be recognized. Therefore, unlike the prior art, it does not require an expensive exhaust pressure switch, and contributes to preventing problems due to water sealing. As described above, according to the present invention, it is possible to provide a stagnant water determination device that can determine with a simple configuration that a water seal has occurred in a trap pipe.

  In addition, the downstream pipe has conductivity, a first downstream pipe (32A) that constitutes a downwardly projecting path, and an upstream opening that has conductivity and is located on the first downstream pipe side. An end (322) is provided apart from the downstream opening end (321) of the first downstream pipe, and configures a passage that protrudes upward from the upstream opening end and further protrudes downward The second downstream pipe (32B) that has electrical insulation and the first downstream pipe in a state where the upstream opening end of the second downstream pipe and the downstream opening end of the first downstream pipe are separated from each other. And a second joint member (34; 134) for connecting the pipe and the second downstream pipe. Further, the second downstream pipe is provided with a third electrode portion (54) so as to be able to energize the second downstream pipe.

  When the first electrode portion, the second electrode portion, and the third electrode portion are energized, the determination means determines that the water level of the accumulated water is the downstream open end of the upstream pipe and the second downstream pipe. It is determined that it is at a height position equal to or higher than that of the upper portion of the upstream opening end. In addition, when only the electrode part and the second electrode part installed in the pipe located on the lower side of the downstream opening end of the upstream pipe and the upstream opening end of the second downstream pipe are in the energized state It is determined that the water level of the staying water is at a position below the opening end located on the upper side. In addition, when the second electrode portion is in a non-energized state in both the first electrode portion and the third electrode portion, the water level of the staying water is lower than the opening end on the lower side. It is characterized by determining that it is in a position.

  According to the present invention, it is not necessary to change the detection position of the water level by replacing the detection parts as in the prior art described above, and the level of the retained water is at least three levels with a simple configuration. It is possible to detect it separately. Therefore, it is possible to provide a stagnant water determination device that eliminates complicated work and complicated configuration and enables water level detection over a wide range.

  One of the disclosed inventions is that a generator (2) that generates electric power, an internal combustion engine (1) that drives the generator, and heat of exhaust gas discharged from the internal combustion engine is used as cooling water for the internal combustion engine. An exhaust heat recovery device (12) for recovering heat, a heating heat exchanger (10) for recovering heat from the cooling water, and a fluid whose temperature is raised by heat exchange with the cooling water in the heating heat exchanger for hot water supply or heating A tank (11) for storing heat as a heat source, an exhaust pipe (15) that constitutes an exhaust passage through which the exhaust absorbed by the exhaust heat recovery unit flows outward, and a pipe that communicates with the exhaust pipe, A cogeneration system comprising: a stagnant water determination device (3, 5; 5, 103) according to the preceding invention in which the separated water flows down.

  According to the present invention, the drain pipe communicating with the exhaust pipe in the cogeneration can be provided with a function that makes it possible to detect the water level of the accumulated water according to the energized state and the non-energized state between the pipes. Therefore, unlike the prior art, it is possible to provide a cogeneration system that can prevent an exhaust outflow problem due to a water seal without requiring an expensive exhaust pressure switch or a complicated detection structure.

It is the schematic which showed the structure of the gas engine system provided with the piping for drains which concerns on this invention. It is drawing which shows the structure of piping for drains of 1st Embodiment. It is a control block diagram for determining whether the water seal part is generated in the stagnant water determination device of the first embodiment. FIG. 3 is a partial cross-sectional view showing a connection relationship between a first joint member and a conductive pipe in the drain pipe according to the first embodiment. In 1st Embodiment, it is a flowchart regarding the control which judges whether a water seal part generate | occur | produces. In the stagnant water determination apparatus of 2nd Embodiment, it is a control block diagram for determining whether a water seal part is generate | occur | produced. It is drawing which shows the structure of piping for drains of 2nd Embodiment. In the drain piping of 2nd Embodiment, it is a fragmentary sectional view which shows the connection relation of a 1st coupling member and an electroconductive pipe | tube. In 2nd Embodiment, it is a flowchart regarding the control which judges whether a water seal part generate | occur | produces.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. In addition to combinations of parts that clearly indicate that each embodiment can be combined specifically, the embodiments may be partially combined even if they are not clearly specified, unless there is a problem with the combination. Is possible.

(First embodiment)
1st Embodiment which is one Embodiment of disclosed invention is described with reference to FIGS. The stagnant water determination device of the first embodiment is applied to a gas engine system 100 as an example of a cogeneration system. The gas engine system 100 is an engine that is driven by using gas as fuel. For example, a gas engine for power generation drives a device such as a heat pump or uses a liquid heated by engine cooling water as a heat source to perform hot water supply, heating, and the like To go. Therefore, the gas engine system 100 is an energy supply system that uses the power of an internal combustion engine or the like to extract electric power and exhaust heat to extract heat and the like, thereby improving the overall energy efficiency.

  As shown in FIG. 1, a gas engine system 100 (hereinafter also referred to as a system 100) includes a generator 2, a gas engine 1 that is an example of an internal combustion engine that drives the generator 2, an exhaust heat recovery device 12, A heating heat exchanger 10 that recovers heat from the cooling water of the gas engine 1. Further, the system 100 includes a tank 11 that stores hot water that has been heated by the heat exchanger 10 for heating and an exhaust pipe 15 that constitutes an exhaust passage through which the exhaust absorbed by the exhaust heat recovery unit 12 flows outward. And a silencer 13 and a separator 14 provided in the exhaust pipe 15. Further, the system 100 includes a drain pipe 3 which is a pipe communicating with the exhaust pipe 15 and into which water separated from the exhaust gas by the separator 14 flows down.

  The gas engine 1 is, for example, a water-cooled engine that uses city gas or LP gas (hereinafter simply referred to as “gas”) as fuel. The intake air and gas supplied to the gas engine 1 are mixed by a mixer. The generated air-fuel mixture flows into the combustion chamber and burns when ignited by the spark plug to drive the piston and rotate the crankshaft connected to the piston. By such an operation, the generated exhaust gas is heat-exchanged with the cooling water of the gas engine 1 by the exhaust heat recovery device 12, and the cooling water is heated to raise the temperature. Since the cooling water passes through the exhaust heat recovery device 12 and passes through a heat generation portion such as a cylinder block of the gas engine 1, heat exchange with the exhaust is performed by the exhaust heat recovery device 12, and then heat exchange with the heat generation portion such as the cylinder block. Thus, the temperature is raised while cooling the gas engine 1.

  The generator 2 is fixed on a crankcase inside a flywheel attached to the upper end of the crankshaft, and generates AC power when rotating relative to the flywheel. The power generation amount of the generator 2 is proportional to the number of revolutions of the engine, and the output of the generator 2 is transmitted to a commercial power source or an electric load by, for example, a power control unit having an electronic control unit, a DC / DC converter and an inverter, It is stored in a storage battery or the like.

  The heating heat exchanger 10 heats up the fluid (for example, hot water) flowing through the secondary side circulation path 17 with the cooling water flowing through the primary side circulation path 16 to raise the temperature. In the heat exchanger 10 for heating, the primary side circulation path 16 and the secondary side circulation path 17 are locally approached to form a heat exchange section. In the heating heat exchanger 10, the cooling water flowing through the primary side circulation path 16 is cooled by transferring heat to the hot water flowing through the secondary side circulation path 17. The primary side circulation path 16 and the secondary side circulation path 17 are respectively provided with a pump 16a and a pump 17a for forcibly circulating the fluid.

  The primary side circulation path 160 is connected to the exhaust heat recovery device 12 from the cooling water outlet of the gas engine 1 through the heating heat exchanger 10. Therefore, after the cooling water heated through the heat generating part of the gas engine 1 flows through the primary circulation path 16 from the cooling water outlet of the gas engine 1 and is heat-exchanged by the heat exchanger 10 for heating, It passes through the exhaust heat recovery device 12 and returns to the cooling water inlet of the gas engine 1.

  The secondary side circulation path 17 is connected from a water outlet located at the lower part of the tank 11 to a water inlet located at the upper part of the tank 11 through the heat exchanger 10 for heating. Therefore, the low-temperature hot water discharged from the water outlet of the tank 11 is heated by the heating heat exchanger 10 and returned to the tank 11 from the water inlet.

  The tank 11 is a hermetically sealed tank, and the periphery is covered with a heat insulating material. Warm water is stored in the tank 11 so as to form a layer in which the temperature of the warm water decreases from the upper part toward the lower part. A water supply port 32c through which tap water such as tap water is supplied is provided in the lower part of the tank 11, and hot water stored in the tank 11 is used in the upper part for hot water supply equipment such as a kitchen and a bath, underfloor heating, etc. A hot water outlet for supplying to a heating device (an example of a heat load) is provided.

  Further, the exhaust pipe 15 connected to the gas engine 1 constitutes an exhaust passage through which the exhaust discharged from the gas engine 1 flows outward. In the middle of the exhaust pipe 15, an exhaust heat recovery device 12, a silencer 13, a separator 14, and a catalyst device are provided. The exhaust gas is separated into gas and water containing condensed water in the separator 14, the gas is discharged from a pipe extending upward, and the water flows as drain water to the drain pipe 3 extending downward from the separator 14. .

  Next, the stagnant water determination device will be described. The stagnant water determination device is a device that detects stagnant water (drain water) that has accumulated in the drain pipe 3. If the accumulated water stays in a certain amount or more in the drain pipe 3, water remains so that the exhaust does not leak to the outside through the drain pipe 3 even if the pressure of the exhaust acts on the drain pipe 3. Configure the seal. If this water seal portion is not formed, the exhaust gas leaks to the outside through the drain pipe 3, and the exhaust gas is discharged to an unexpected place. In order to avoid this situation, it is important to determine whether or not a water seal portion is formed inside the drain pipe 3.

  As shown in FIG. 2, the drain pipe 3 communicates with an exhaust pipe 15 through which exhaust gas discharged from the gas engine 1 flows, and constitutes a drain water drainage passage. The drain pipe 3 includes an upstream pipe 31, a first joint member 33, and a downstream pipe 32.

  The upstream pipe 31 is a pipe extending downward from the exhaust pipe 15 side. The upstream pipe 31 has conductivity and is configured as, for example, a metal pipe. A first electrode portion 52 is installed in the upstream pipe 31 so that the upstream pipe 31 can be energized. The first electrode unit 52 is electrically connected to the control device 5, and an electric signal from the first electrode unit 52 is input to the control device 5. Accordingly, when the passage in the upstream pipe 31 is filled with the staying water, it is electrically connected to other members and pipes having conductivity through the staying water. Further, the upstream pipe 31 may be a pipe extending directly from the separator 14 or a pipe connected to the pipe extending from the separator 14 and further extending downward.

  The downstream pipe 32 is a pipe connected to the upstream pipe 31 via the first joint member 33, and configures a passage that extends downward from the upstream opening end 320 and protrudes downward so as to be folded upward. To do. The downstream pipe 32 has a U-shaped portion that protrudes downward in this portion. The downstream pipe 32 has conductivity like the upstream pipe 31, and is configured as, for example, a metal pipe. The downstream pipe 32 is provided such that the upstream opening end 320 located on the upstream pipe 31 side is separated from the downstream opening end 310 of the upstream pipe 31. Therefore, the upstream opening end 320 is separated so as to be positioned below the downstream opening end 310.

  A second electrode portion 53 is installed in the downstream pipe 32 so that the downstream pipe 32 can be energized. The second electrode unit 53 is electrically connected to the control device 5, and an electric signal from the second electrode unit 53 is input to the control device 5. Therefore, when the stagnant water filled in the passage in the downstream pipe 32 has a water level in contact with the upstream pipe 31, the downstream pipe 32 and the upstream pipe 31 are electrically connected via the stagnant water. become.

  The 1st coupling member 33 is a member which fixes and connects the downstream pipe 32 and the upstream pipe 31 in the state which left the space | interval, and is comprised with the material which has electrical insulation. The first joint member 33 is made of electrically insulating resin, rubber, or the like. Furthermore, the first joint member 33 may be a member that has flexibility and is easily deformed by an external force. According to this, it is easy to change the shape of the drain pipe 3, and it is easy to adjust the installation position and perform the installation work.

  The first joint member 33 is a cylindrical member having both ends opened. The shape of the inner peripheral surface of the first joint member 33 is formed in the same shape as the outer peripheral shape of the downstream opening end 310 of the upstream pipe 31 and the upstream opening end 320 of the downstream pipe 32. The first joint member 33 holds and fixes the upstream pipe 31 so that the outer peripheral surface of the upstream pipe 31 inserted from one opening end and the inner peripheral surface near the one opening end are in close contact with each other. The first joint member 33 holds and fixes the downstream pipe 32 so that the outer peripheral surface of the downstream pipe 32 inserted from the other opening end and the inner peripheral surface near the other opening end are in close contact with each other. At this time, since the downstream opening end 310 and the upstream opening end 320 are spaced apart from each other, when the water level of the accumulated water is below the downstream opening end 310, the upstream pipe 31 and the downstream pipe 32. Is not electrically conductive. When the water level is equal to or higher than the downstream opening end 310, the upstream pipe 31 and the downstream pipe 32 are electrically connected.

  Further, the downstream pipe 32 has at least a convex U-shaped part downward, but may have a convex inverted U-shaped part on the downstream side of the downward convex U-shaped part. The structure may be omitted. That is, when the height position of the downstream opening end from which drain water flows out is lower than the highest position at the highest position of the downwardly convex U-shaped portion, the upper position is as shown in FIG. A convex inverted U-shaped portion. The stagnant water staying in the downwardly convex U-shaped part will get over the highest part when the water level becomes higher than the highest part of the downwardly convex U-shaped part, and will flow out from the downstream opening end. Become.

  The retained water determination device will be described with respect to control for determining whether or not a water seal portion has occurred. The stagnant water determination device includes a control device 5 that determines whether or not a water seal portion is generated. The control device 5 includes a microcomputer that includes functions such as a CPU (central processing unit) that performs arithmetic processing and control processing, a memory such as a ROM and a RAM, and an I / O port (input / output circuit). ing. The control device 5 includes an input circuit to which an electric signal from the first electrode unit 52 and the second electrode unit 53, a signal indicating the state of the gas engine 1, a signal from the indoor remote controller indicating the state of the device, and the like are input. Prepare. The control device 5 is an arithmetic circuit unit that constitutes a determination unit, and includes a determination unit 50 that executes predetermined calculations and determinations using various information based on various signals input to the input unit, an arithmetic program, and the like. The control device 5 includes an operation control unit 51 that controls the operation and stop of the gas engine 1 according to the determination result by the determination unit 50 and generates a predetermined display or alarm on the indoor remote controller 6 or the like. The operation control unit 51 constitutes an output circuit that controls the operation of various devices.

  The 1st coupling member 33 is good also as a shape like the 1st coupling member 133 illustrated in FIG. The first joint member 133 has a box shape, and includes an upper wall 133b and a lower wall 133c facing each other in the vertical direction, and a side wall extending in the vertical direction that connects the upper wall 133b and the lower wall 133c. It is a box shape. The side wall extending in the vertical direction is provided so as to surround the inner space of the first joint member 133 by connecting the outer peripheral edge of the upper wall 133b and the outer peripheral edge of the lower wall 133c.

  The upstream pipe 31 is fixed to the upper wall 133b such that the downstream opening end 310 is positioned below the upper wall 133b and penetrates the upper wall 133b. The downstream pipe 32 is fixed to the lower wall 133c such that the upstream opening end 320 is positioned above the lower wall 133c and penetrates the lower wall 133c. Further, the inner surface 133 a of the vertical side wall is configured to be separated from both the upstream opening end 320 of the downstream pipe 32 and the downstream opening end 310 of the upstream pipe 31. Therefore, the inner peripheral surface of the side wall of the first joint member 133 is separated from both the upstream side open end 320 and the downstream side open end 310, and outside the outer peripheral portion at each open end of the downstream pipe 32 and the upstream pipe 31. Located in the direction.

  Next, control for determining whether or not a water seal portion has occurred by the stagnant water determination device of the first embodiment will be described with reference to the flowchart of FIG. This flowchart is started when the control device 5 is powered on, and is executed by the control device 5. This flowchart is repeatedly performed at predetermined time intervals. That is, once this flowchart is finished, the processing after step 10 is executed again after a predetermined time has elapsed.

  When this flowchart is started, it is first determined in step 10 whether or not an activation command from the gas engine 1 has been input. The determination process in step 10 is repeated until a start command from the gas engine 1 is input. If it is determined in step 10 that an activation command from the gas engine 1 has been input, then in step 20, the control device 5 acquires an electrical signal from each of the first electrode unit 52 and the second electrode unit 53.

  The determination unit 50 in the control device 5 determines in step 30 whether the water level in the drain pipe 3 is equal to or higher than the H level shown in FIG. The determination unit 50 determines the water level of the accumulated water based on the current level flowing through the first electrode unit 52 and the second electrode unit 53 using an electrical signal acquired from each electrode unit. For example, when the current value for conducting the first electrode unit 52 and the second electrode unit 53 is larger than a predetermined conduction threshold value, the determination unit 50 has the first electrode unit 52 and the second electrode unit 53. Are determined to be in an energized state. Thus, when it is in an energized state, since the upstream pipe 31 and the downstream pipe 32 are energized, both pipes separated in the first joint member 33 fill the inside of the first joint member 33. It is electrically connected by the staying water. Accordingly, the water level of the staying water is equal to or higher than the downstream opening end 310 of the upstream pipe 31, and the control device 5 determines in step 30 that the water level of the staying water is higher than the H level.

  In addition, when the current value for conducting the first electrode unit 52 and the second electrode unit 53 is equal to or less than a predetermined conduction threshold, the determination unit 50 performs the first electrode unit 52 and the second electrode unit 53. Are determined to be in a non-energized state. Thus, in the non-energized state, since the upstream pipe 31 and the downstream pipe 32 are not energized, the downstream opening end 310 of the upstream pipe 31 is not in contact with the accumulated water. Therefore, the level of the staying water is at a position lower than the downstream side open end 310 of the upstream pipe 31 or no staying water is present. It is determined that:

  If it is determined in step 30 that the water level of the staying water is below the L level, the operation control unit 51 displays a command that water should be replenished to the indoor remote controller 6 in step 40 or executes a process of sounding. Furthermore, the operation control part 51 performs the process which stops starting of the gas engine 1 by step 50, and complete | finishes this flowchart. In response to this rehydration instruction, the indoor remote controller 6 displays characters and marks indicating “replenishment”, turns on and blinks the LED lamp, and sounds a sound and warning sound for prompting “refilling”. In response to this rehydration instruction, the user, the maintenance worker, etc. replenish the water so that it flows into the drain pipe 3. When the water level of the stagnant water becomes higher than the H level due to the supplementary water, it is determined as YES in Step 30 and the process of Step 60 is executed.

  If it is determined in step 30 that the water level is higher than the H level, the exhaust gas is not discharged through the drain pipe 3 by the operation of the gas engine 1, so that the operation control unit 51 starts the gas engine 1 in step 60. Execute. Next, in step 70, it is determined whether or not the level of the accumulated water in the drain pipe 3 is higher than the H level during the operation of the gas engine 1. In step 70, the same determination process as in step 30 described above is performed. The operation of the gas engine 1 is continued while it is determined in step 70 that the level of the staying water is higher than the H level.

  If it determines with the water level of stagnant water not being more than H level in step 70, the operation control part 51 will perform the process which stops the driving | operation of the gas engine 1 in step 80. FIG. Further, in step 90, the operation control unit 51 displays a command for water replenishment to the indoor remote controller 6 or executes a sounding process (the same process as in the above-described step 40), and ends this flowchart.

  Next, the effect which the stagnant water determination apparatus of 1st Embodiment brings is demonstrated. The stagnant water determination device is connected to each of the first electrode portion 52 and the second electrode portion 53 so as to be energized, and whether or not the first electrode portion 52 and the second electrode portion 53 are in an energized state. Determination means for determining whether or not. When the first electrode portion 52 and the second electrode portion 53 are energized, this determination means determines that the water level staying in the downstream pipe 32 is the downstream open end 310 of the upstream pipe 31. Is determined to be at a height position equal to or greater than. In addition, when the first electrode portion 52 and the second electrode portion 53 are in a non-energized state, the determination means determines that the water level staying in the downstream pipe 32 is higher than the downstream opening end 310. Determined to be in the lower position.

  According to this configuration, it is possible to configure the drain pipe 3 that connects the conductive upstream pipe 31 and the downstream pipe 32 with the electrically insulating first joint member 33 while maintaining the electrical insulation relationship. Depending on whether the upstream pipe 31 and the downstream pipe 32 are energized or not energized, the water level of the accumulated water can be detected in at least two stages. Moreover, the water seal part of the drain pipe 3 is insufficient or cut by detecting the non-energized state of the electrode parts provided in each pipe using the property that drain water conducts electricity. The state can be detected by a configuration that does not require a complicated mechanism with a reliable and simple control process. Therefore, the stagnant water determination device according to the first embodiment can contribute to preventing a malfunction due to water sealing without requiring an expensive exhaust pressure switch or the like as in the prior art.

  Further, the first joint member 133 is configured such that the inner surface 133a of the side wall extending in the vertical direction is separated from both the upstream opening end 320 of the downstream pipe 32 and the downstream opening end 310 of the upstream pipe 31. Is preferred. According to this configuration, drain water that hangs downward from the downstream opening end 310 does not travel along the side wall of the first joint member 133 and falls to the upstream opening end 320. For this reason, it is possible to prevent the drain water that wets the side wall of the first joint member 133 from becoming a conduction path and electrically connecting the upstream pipe 31 and the downstream pipe 32. Therefore, it is possible to provide a stagnant water determination device that can reliably detect the energized state of the upstream pipe 31 and the downstream pipe 32 when the water level of the stagnant water rises to the inside of the upstream pipe 31.

  Further, according to the gas engine system 100, the drain pipe 3 communicating with the exhaust pipe 15 can be provided with a function that makes it possible to detect the water level of the accumulated water according to the energized state and non-energized state between the pipes. . From the detection result of the water level, when the water seal portion is not in a sufficient state, it is possible to urge the supply of water to the drain pipe 3, and it is possible to prevent a problem of exhaust outflow. Therefore, it is possible to provide a cogeneration system that can prevent a malfunction due to a water seal without requiring an expensive exhaust pressure switch or a complicated detection structure as in the prior art.

(Second Embodiment)
In the second embodiment, another embodiment of the drain pipe 3 and stagnant water detection control described in the first embodiment will be described with reference to FIGS. In each figure, the structure which attached | subjected the same code | symbol as the above-mentioned drawing is the same structure, and there exists the same effect. Only the contents different from the first embodiment will be described below.

  As shown in FIG. 6, in addition to the first electrode portion 52 and the second electrode portion 53, the control device 5 includes an electrical signal from the third electrode portion 54, a signal indicating the state of the gas engine 1, An input circuit for receiving a signal from an indoor remote controller indicating the state is provided.

  As shown in FIG. 7, the drain pipe 103 communicates with the exhaust pipe 15 through which the exhaust discharged from the gas engine 1 flows, and constitutes a drain water drainage passage. The drain pipe 103 includes an upstream pipe 31, a first downstream pipe 32A as a downstream pipe, a first joint member 33, a second downstream pipe 32B as a downstream pipe, and a second joint member 34. , And is configured.

  The first downstream pipe 32A is a pipe connected to the upstream pipe 31 through the first joint member 33, extends downward from the upstream opening end 320 thereof, and further protrudes downward so as to be folded back upward. Configure the passage. The first downstream pipe 32A has conductivity like the upstream pipe 31, and is configured as, for example, a metal pipe. The first downstream pipe 32 </ b> A is provided such that the upstream opening end 320 located on the upstream pipe 31 side is separated from the downstream opening end 310 of the upstream pipe 31.

  A second electrode portion 53 is installed in the first downstream pipe 32A so that the first downstream pipe 32A can be energized. Therefore, when the stagnant water filled in the passage in the first downstream pipe 32A has a water level in contact with the upstream pipe 31, the first downstream pipe 32A and the upstream pipe 31 are connected via the stagnant water. It becomes electrically conductive.

  The first joint member 33 is a member that fixes and connects the first downstream pipe 32A and the upstream pipe 31 with a space therebetween, and is made of a material having electrical insulation. Therefore, when the water level is equal to or higher than the downstream opening end 310, the upstream pipe 31 and the first downstream pipe 32A are electrically connected.

  The second downstream pipe 32B is a pipe connected to the first downstream pipe 32A via the second joint member 34. The second downstream pipe 32B extends upward from the upstream opening end 322 thereof, and further upwards so as to be folded downward. Constructs a convex path. The second downstream pipe 32B has an upside-down inverted U-shaped portion in this portion. The second downstream pipe 32B has conductivity like the upstream pipe 31 and the first downstream pipe 32A, and is configured as, for example, a metal pipe. The second downstream pipe 32B is provided such that the upstream opening end 322 located on the first downstream pipe 32A side is separated from the downstream opening end 321 of the first downstream pipe 32A. Therefore, the upstream opening end 322 is separated so as to be positioned above the downstream opening end 321.

  A third electrode portion 54 is installed in the second downstream pipe 32B so as to be able to energize the second downstream pipe 32B. The third electrode unit 54 is electrically connected to the control device 5, and an electric signal from the third electrode unit 54 is input to the control device 5. Therefore, when the stagnant water filled in the passage in the first downstream pipe 32A has a water level that contacts the second downstream pipe 32B, the first downstream pipe 32A and the second downstream pipe are connected via the stagnant water. The downstream pipe 32B and the upstream pipe 31 are electrically connected.

  The second joint member 34 is a member that fixes and connects the first downstream pipe 32A and the second downstream pipe 32B with a space therebetween, and is made of a material having electrical insulation. The second joint member 34 is made of electrically insulating resin, rubber, or the like. Further, the second joint member 34 may be a member that has flexibility and is easily deformed by an external force. According to this, it is easy to change the shape of the drain pipe 103, and it is easy to adjust the installation position and perform the mounting operation.

  The second joint member 34 is a cylindrical member that is open at both ends. The shape of the inner peripheral surface of the second joint member 34 is formed in the same shape as the outer peripheral shape of the downstream opening end 321 of the first downstream pipe 32A and the upstream opening end 322 of the second downstream pipe 32B. . The second joint member 34 connects the first downstream pipe 32A so that the outer peripheral surface of the first downstream pipe 32A inserted from one opening end and the inner peripheral surface near the one opening end are in close contact with each other. Hold and fix. The second joint member 34 connects the second downstream pipe 32B so that the outer peripheral surface of the second downstream pipe 32B inserted from the other opening end and the inner peripheral surface near the other opening end are in close contact with each other. Hold and fix. At this time, because the downstream opening end 321 and the upstream opening end 322 have a predetermined interval, when the water level of the staying water is below the upstream opening end 322, the first downstream pipe 32A The second downstream pipe 32B is not electrically connected. When the water level is equal to or higher than the upstream opening end 322, the first downstream pipe 32A and the second downstream pipe 32B are electrically connected.

  In addition, the staying water staying in the first downstream pipe 32A that is a downward convex U-shaped part has a higher water level than the highest part of the second downstream pipe 32B that is an upward convex U-shaped part. In this case, the vehicle passes over the highest portion and flows out from the downstream opening end of the second downstream pipe 32B.

  Further, the second joint member 34 may have a shape like the second joint member 134 illustrated in FIG. 8. The second joint member 134 has a box shape, and includes an upper wall 134b and a lower wall 134c facing each other in the vertical direction, and a side wall extending in the vertical direction that connects the upper wall 134b and the lower wall 134c. It is a box shape. The side wall extending in the vertical direction is provided so as to surround the inner space of the second joint member 134 by connecting the outer peripheral edge of the upper wall 134b and the outer peripheral edge of the lower wall 134c.

  The second downstream pipe 32B is fixed to the upper wall 134b so that the upstream opening end 322 is positioned below the upper wall 134b and penetrates the upper wall 134b. The first downstream pipe 32A is fixed to the lower wall 134c such that the downstream opening end 321 is positioned above the lower wall 134c and penetrates the lower wall 134c. Furthermore, the inner surface 134a of the vertical side wall is configured to be separated from both the upstream opening end 322 of the second downstream pipe 32B and the downstream opening end 321 of the first downstream pipe 32A. Therefore, the inner peripheral surface of the side wall of the second joint member 134 is separated from both the upstream opening end 322 and the downstream opening end 321, and each opening of the first downstream pipe 32A and the second downstream pipe 32B. Located outside the outer peripheral portion at the end.

  Next, control for determining whether or not a water seal portion is generated by the stagnant water determination device of the second embodiment will be described with reference to the flowchart of FIG. 9. In the stagnant water detection control in the second embodiment, it is possible to detect the water level of stagnant water remaining in the drain pipe 103 in three stages (H level, M level, and L level).

  The flowchart of FIG. 9 differs from the flowchart of FIG. 5 in the determination process in step 120, the subsequent process in the case of determining NO in step 120, and the determination process in step 170. Steps 100, 110, 130, 150, 160, 180, and 190 in FIG. 9 correspond to steps 10, 20, 30, 40, 50, 60, 80, and 90 in FIG. The step of FIG. 9 corresponding to the step of FIG. 5 of the first embodiment performs the same processing as the first embodiment and has the same effect.

  In step 120, the determination unit 50 determines whether or not the water level in the drain pipe 103 is equal to or higher than the H level shown in FIG. The determination unit 50 uses the electrical signal acquired from each electrode unit to determine the level of the accumulated water based on the current level flowing through the first electrode unit 52, the second electrode unit 53, and the third electrode unit 54. judge. For example, when the current value for conducting the first electrode unit 52 and the third electrode unit 54 is larger than a predetermined conduction threshold value, the determination unit 50 has the first electrode unit 52 and the second electrode unit 53. It is determined that all of the third electrode parts 54 are energized.

  Thus, in the energized state, since the upstream pipe 31 and the second downstream pipe 32B are energized, the first joint member 33 and the second joint member 341 filled with stagnant water are used. The upstream pipe 31, the first downstream pipe 32A, and the second downstream pipe 32B are electrically connected. Therefore, the water level of the staying water is at a height equal to or higher than the upstream opening end 322 of the second downstream pipe 32B, and the control device 5 determines that the water level of the staying water is at the H level or higher in step 120. judge.

  In addition, when the current value for conducting the first electrode unit 52 and the third electrode unit 54 is equal to or less than a predetermined conduction threshold value, the determination unit 50 performs the first electrode unit 52 and the third electrode unit 54. Are determined to be in a non-energized state. Thus, when it is a non-energized state, since the upstream pipe 31 and the 2nd downstream pipe 32B are not supplying with electricity, the upstream opening end 322 is not contacting the accumulated water. Therefore, the water level of the staying water is at a position lower than the upstream opening end 322, and the control device 5 determines in step 120 that the water level of the staying water is equal to or lower than the M level.

  If it is determined in step 120 that the water level of the staying water is below the M level, the operation control unit 51 displays a command that water is to be replenished to the indoor remote controller 6 in step 130 or executes a sounding process. Proceed to step 140.

  In step 140, it is determined whether or not the water level in the drain pipe 103 is equal to or higher than the M level shown in FIG. The determination unit 50 determines the water level of the accumulated water based on the current level flowing through the first electrode unit 52 and the second electrode unit 53 using an electrical signal acquired from each electrode unit. For example, when the current value for conducting the first electrode unit 52 and the second electrode unit 53 is larger than a predetermined conduction threshold value, the determination unit 50 has the first electrode unit 52 and the second electrode unit 53. Are determined to be in an energized state.

  Thus, in the energized state, since the upstream pipe 31 and the first downstream pipe 32A are energized, the upstream pipe 31 and the first pipe 31 are connected via the first joint member 33 filled with the accumulated water. The downstream pipe 32A is electrically connected. Therefore, the water level of the staying water is below the upstream opening end 322 of the second downstream pipe 32B and at a height equal to or higher than the downstream opening end 310 of the upstream pipe 31, and the control device 5 Determines in step 140 that the water level of the accumulated water is M level.

  In addition, when the current value for conducting the first electrode unit 52 and the second electrode unit 53 is equal to or less than a predetermined conduction threshold, the determination unit 50 performs the first electrode unit 52 and the second electrode unit 53. Are determined to be in a non-energized state. Thus, in the non-energized state, since the upstream pipe 31 and the first downstream pipe 32A are not energized, the downstream opening end 310 is not in contact with the accumulated water. Therefore, the water level of the staying water is at a position lower than the downstream side open end 310, and the control device 5 determines in step 140 that the water level of the staying water is L level or less.

  If it is determined in step 140 that the level of the staying water is at the M level, the process proceeds to step 160, where the operation control unit 51 executes a process for starting the gas engine 1. If it is determined in step 140 that the water level of the accumulated water is equal to or lower than the L level, the operation control unit 51 executes a process for stopping the start of the gas engine 1 in step 150 and ends this flowchart.

  During operation after the gas engine 1 is started in step 160, it is determined in step 170 whether or not the water level of the accumulated water in the drain pipe 103 is equal to or higher than the M level. In step 170, the same determination process as in step 140 described above is executed. The operation of the gas engine 1 is continued while it is determined in step 170 that the water level of the accumulated water is equal to or higher than the M level.

  If it is determined in step 170 that the water level of the accumulated water is not equal to or higher than the M level, the operation control unit 51 executes a process for stopping the operation of the gas engine 1 in step 180. Further, in step 190, the operation control unit 51 displays a command for water replenishment to the indoor remote controller 6 or executes a sounding process (the same process as in the above-described step 130), and ends this flowchart.

  As described above, in the stagnant water detection control of the second embodiment, when the stagnant water level is at the H level, the first electrode portion 52, the second electrode portion 53, and the third electrode portion 54 are used. All of which are conducted through stagnant water. Moreover, when the water level of a staying water is M level, the 1st electrode part 52 and the 2nd electrode part 53 conduct | electrically_connect through a staying water. Further, when the water level of the staying water is at the L level, none of the first electrode part 52, the second electrode part 53, and the third electrode part 54 is electrically connected to the other electrode part.

  In the stagnant water detection control of the second embodiment, when the downstream opening end 310 of the upstream pipe 31 is installed so as to be positioned above the upstream opening end 322 of the second downstream pipe 32B, The boundary position at the H level is set at the downstream opening end 310. In this configuration, when the detected level of accumulated water is at the H level, the water level exists at a height equal to or higher than that of the downstream opening end 310, and when it is at the M level, it is below the downstream opening end 310. Thus, the water level exists at a height position equal to or higher than the upstream opening end 322.

  Next, the effect which the staying water determination apparatus of 2nd Embodiment brings is demonstrated. The downstream pipe of the stagnant water determination device includes a first downstream pipe 32A, a second downstream pipe 32B, and second joint members 34 and 134. The first downstream pipe 32A has conductivity and constitutes a path that protrudes downward. The second downstream pipe 32B has conductivity, and the upstream opening end 322 located on the first downstream pipe 32A side is provided away from the downstream opening end 321 of the first downstream pipe 32A. A path that protrudes upward and extends upward from the upstream opening end 322 is formed. The second joint members 34 and 134 have electrical insulation, and the second joint members 34 and 134 are in a state where the upstream opening end 322 of the second downstream pipe 32B and the downstream opening end 321 of the first downstream pipe 32A are separated from each other. The first downstream pipe 32A and the second downstream pipe 32B are connected. Further, the second downstream pipe 32B is provided with a third electrode portion 54 so that the second downstream pipe 32B can be energized.

  Furthermore, when all the electrode parts 52, 53, 54 are energized, the determination unit 50 determines that the water level of the accumulated water is the upstream side 310 of the upstream pipe 31 and the upstream side of the second downstream pipe 32B. It is determined that the opening end 322 is at a height position equal to or higher than the portion located above. When only the electrode part and the second electrode part 53 installed in the pipe located on the lower side of the downstream side open end 310 and the upstream side open end 322 are in the energized state, the determination unit 50 It is determined that the water level is lower than the opening end located on the upper side. In addition, when the second electrode unit 53 is in a non-energized state for both the first electrode unit 52 and the third electrode unit 54, the determination unit 50 determines that the water level of the staying water is located below. It is determined that it is at a position below the open end of.

  According to the stagnant water determination device of the second embodiment, it is not necessary to change the detection position of the water level by, for example, replacing the detection parts, and the water level detection divided into at least three stages with a simple configuration. realizable. That is, it is possible to provide a stagnant water determination device that eliminates complicated setting work and complicated configuration and enables fine water level detection.

  The stagnant water determination device includes a first joint member 133 and a second joint member 34. The second joint member 34 has an inner surface 134a of a side wall extending in the vertical direction so as to be separated from both the downstream opening end 321 of the first downstream pipe 32A and the upstream opening end 322 of the second downstream pipe 32B. Preferably, it is configured. According to this configuration, drain water that hangs down from the upstream opening end 322 does not travel along the inner surface of the side wall of the second joint member 34, and falls to the downstream opening end 321. For this reason, it is possible to prevent the drain water that wets the inner surface of the side wall of the second joint member 34 from being a conduction path and electrically connecting the first downstream pipe 32A and the second downstream pipe 32B. Therefore, a stagnant water determination device is provided that can reliably detect the energized state of the first downstream pipe 32A and the second downstream pipe 32B when the water level of the stagnant water enters the second downstream pipe 32B. it can.

(Other embodiments)
The preferred embodiments of the disclosed invention have been described above, but the disclosed invention is not limited to the above-described embodiments, and various modifications can be made. The structure of the above-described embodiment is merely an example, and the technical scope of the disclosed invention is not limited to the scope of these descriptions. The technical scope of the disclosed invention is indicated by the description of the scope of claims, and further includes all modifications within the meaning and scope equivalent to the description of the scope of claims.

  The cogeneration system included in the disclosed invention is not limited to the gas engine system 100 described in the above embodiment. This cogeneration system is a system that generates electric power and uses waste heat as a heat source for hot water supply, heating, and operation of equipment, and the fuel for driving the internal combustion engine is not limited to gas.

  In the above-described embodiment, when there is a water replenishment instruction, the system 100 having an automatic water replenishment function is configured so that water replenishment work is performed by a user, a maintenance worker, etc., and water replenishment is automatically performed. Also good.

DESCRIPTION OF SYMBOLS 1 ... Gas engine (internal combustion engine), 3 ... Drain piping 15 ... Exhaust pipe, 31 ... Upstream pipe, 32 ... Downstream pipe 33 ... 1st coupling member 50 ... Determination part (determination means)
52 ... 1st electrode part, 53 ... 2nd electrode part 310 ... Downstream opening end 320 ... Upstream opening end

Claims (5)

A stagnant water determination device that communicates with an exhaust pipe (15) through which exhaust gas discharged from an internal combustion engine (1) flows, and that can detect drain water accumulated in a drain pipe (3) that constitutes a drainage passage,
An upstream pipe (31) having electrical conductivity and extending downward from the exhaust pipe side;
An upstream opening end (320) that is electrically conductive and is located on the upstream pipe side is provided apart from the downstream opening end (310) of the upstream pipe, and extends downward from the upstream opening end. A downstream pipe (32; 32A, 32B) that constitutes a path that extends downward and protrudes downward so as to be folded upward;
A first joint member having electrical insulation and connecting the upstream pipe and the downstream pipe in a state where the upstream opening end of the downstream pipe and the downstream opening end of the upstream pipe are separated from each other ( 33; 133)
A first electrode portion (52) installed to be energized to the upstream pipe;
A second electrode portion (53) installed to be energized to the downstream pipe;
Determination means connected to each of the first electrode portion and the second electrode portion so as to be energized, and determining whether or not the first electrode portion and the second electrode portion are in an energized state. (50),
With
When the first electrode portion and the second electrode portion are energized, the determination means determines that the water level staying in the downstream pipe is the downstream open end of the upstream pipe. When the first electrode portion and the second electrode portion are in a non-energized state, the level of the accumulated water staying in the downstream pipe is It is determined that the upstream pipe is located at a position below the downstream opening end of the upstream pipe. The downstream pipe is
A first downstream pipe (32A) having conductivity and forming a downwardly projecting path;
An upstream opening end (322) having conductivity and located on the first downstream pipe side is provided apart from the downstream opening end (321) of the first downstream pipe, and A second downstream pipe (32B) constituting a passage extending upward from the side opening end and projecting upward so as to be folded downward;
It has electrical insulation, and the first downstream pipe and the second downstream pipe are spaced apart from the upstream opening end of the second downstream pipe and the downstream opening end of the first downstream pipe. A second coupling member (34; 134) connecting the downstream pipe;
Configured with
Further, the second downstream pipe is provided with a third electrode portion (54) so as to be able to energize the second downstream pipe,
The determination means includes
When the first electrode portion, the second electrode portion, and the third electrode portion are energized, the water level of the accumulated water is determined by the downstream open end of the upstream pipe and the second It is determined that it is at a height position equal to or higher than the part located on the upper side of the upstream side open end of the downstream pipe,
Only the electrode part and the second electrode part installed in the pipe located on the lower side of the downstream opening end of the upstream pipe and the upstream opening end of the second downstream pipe are in the energized state. In this case, it is determined that the water level of the staying water is in a position below the opening end on the upper side,
When the second electrode portion is in a non-energized state with respect to both the first electrode portion and the third electrode portion, the water level of the stagnant water is from the opening end on the lower side. 2 is determined to be in a lower position, the stagnant water determination device according to claim 1.   The first joint member (133) is configured such that the inner surface (133a) of the side wall extending in the vertical direction is separated from both the upstream opening end of the downstream pipe and the downstream opening end of the upstream pipe. The stagnant water determination device according to claim 1, wherein: In the first joint member (133), the inner surface (133a) of the side wall extending in the vertical direction is separated from both the downstream opening end of the upstream pipe and the upstream opening end of the first downstream pipe. Configured to
In the second joint member (134), the inner surface (134a) of the side wall extending in the vertical direction has both the downstream open end of the first downstream pipe and the upstream open end of the second downstream pipe. The stagnant water determination device according to claim 2, wherein the stagnant water determination device is configured to be separated from the water. A generator (2) for generating electric power;
An internal combustion engine (1) for driving the generator;
An exhaust heat recovery device (12) for recovering the heat of the exhaust discharged from the internal combustion engine into the cooling water of the internal combustion engine;
A heating heat exchanger (10) for recovering heat from the cooling water;
A tank (11) for storing a fluid heated up by heat exchange with the cooling water in the heating heat exchanger as a heat source for hot water supply or heating;
An exhaust pipe (15) that constitutes an exhaust passage through which the exhaust absorbed by the exhaust heat recovery device flows toward the outside;
The stagnant water determination device (3, 5; 5, 103) according to any one of claims 1 to 4, which is a pipe communicating with the exhaust pipe, and water separated from the exhaust flows down.
Cogeneration system characterized by comprising.

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