JP2014181861A - Air-fuel mixture supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-fuel mixture supply system capable of supplying an air-fuel mixture suitable to combustion in a combustion device while suppressing loss of preliminary fuel gas.SOLUTION: An air-fuel mixture supply system includes an air-fuel mixture supply path 4 which supplies an air-fuel mixture M, obtained by mixing air A with preliminary fuel gas G2 supplied from a preliminary fuel gas tank, to a combustion device, and allows the combustion device to burn the air-fuel mixture M supplied by the air-fuel mixture supply path 4. The air-fuel mixture supply system includes a discharge path 22 for discharging the air-fuel mixture M from the air-fuel mixture supply path 4 to the outside, opening/closing means 23 capable of freely opening and closing the discharge path 22, and heating value measuring means 24 for measuring the heating value of the air-fuel mixture M discharged to the outside from the discharge path 22, and further includes determination means 27 for determining whether the heating value measured by the heating value measuring means 24 is within a proper heating value range adapted to the operation of the combustion device.

Description

The present invention relates to a combustion apparatus that burns when supplied with a normal fuel gas, and a reserve fuel gas tank that stores a reserve fuel gas that is different from the normal fuel gas, the reserve fuel gas supplied from the reserve fuel gas tank. An air-fuel mixture supply path for supplying air-fuel mixture to the combustion device;
The present invention relates to an air-fuel mixture supply system that enables combustion with the air-fuel mixture supplied through the air-fuel mixture supply path.

  As a conventional air-fuel mixture supply system, for example, in Patent Document 1, a venturi mixer that generates air-fuel mixture by mixing air with a raw material gas supplied from a raw material gas cylinder as a reserve fuel gas tank, a venturi mixer, a combustion device, and the like And an air-fuel mixture supply system that supplies an air-fuel mixture to a combustion device or the like.

  In addition, this air-fuel mixture supply system is a portable system, and when a natural disaster occurs and the supply of city gas is stopped, the air-fuel mixture supply system is transported to the disaster area and the existing city gas is installed. It can be connected to piping, and can supply a mixture of raw material gas and air instead of city gas to a combustion device or the like connected to the existing piping, and the existing combustion device can be operated. ing.

JP 2010-2133 A

  In the air-fuel mixture supply system disclosed in Patent Document 1, when the air-fuel mixture generated by the venturi mixer is supplied to the combustion device, the air-fuel mixture remains in the air-fuel mixture supply path between the venturi mixer and the combustion device. When the air-fuel mixture is left in the air-fuel mixture supply path for a long period of time as described above, the air constituting the air-fuel mixture and the source gas are separated by the difference in specific gravity. Therefore, if the air-fuel mixture remaining in the air-fuel mixture supply path when a certain disaster occurs remains in the air-fuel mixture supply pipe for a long time until the next disaster occurs, it is separated by the long-term residual The inventors have found that the air-fuel mixture is supplied to the combustion device, which may cause a problem that the combustion device cannot be operated properly.

  On the other hand, in order to operate the combustion apparatus appropriately, the inventors supply the newly generated air-fuel mixture to the air-fuel mixture supply path before supplying the air-fuel mixture to the combustion apparatus. In a state where the air-fuel mixture remaining by the air-fuel mixture is pushed out from the air-fuel mixture supply passage, the remaining air-fuel mixture is supplied to the combustion device by being discharged to the outside from the discharge passage provided in the air-fuel mixture supply passage. I thought about avoiding it.

  However, in such an air-fuel mixture supply system, the distance between the installation position and the combustion device varies, and thus the length of the air-fuel mixture supply path cannot be specified. Furthermore, since the volume of the air-fuel mixture remaining in the air-fuel mixture supply path varies depending on the pressure in the air-fuel mixture supply path where the air-fuel mixture remains, the air-fuel mixture remaining in the air-fuel mixture supply path is discharged from the discharge path. It is difficult to find the optimal release period required to do so. Therefore, when the discharge period is excessively shortened, the mixture remaining in the mixture supply path is not completely released, but the mixture obtained by separating the air and the raw material gas is supplied to the combustion device. The combustion apparatus cannot be operated properly. On the other hand, if the release period is excessively long, in addition to the mixture remaining in the mixture supply path, the newly generated mixture supplied to the mixture supply path will be released to the outside, Source gas loss occurs.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an air-fuel mixture supply system capable of supplying an air-fuel mixture suitable for combustion in a combustion device while suppressing the loss of reserve fuel gas. There is to do.

In order to achieve the above object, an air-fuel mixture supply system according to the present invention comprises:
Combustion apparatus that receives normal fuel gas and burns, and reserve fuel gas tank that stores reserve fuel gas different from the normal fuel gas, mix air with the reserve fuel gas supplied from the reserve fuel gas tank. An air-fuel mixture supply path for supplying the air-fuel mixture to the combustion device,
An air-fuel mixture supply system in which the combustion device can combust with the air-fuel mixture supplied in the air-fuel mixture supply path,
A discharge path for discharging the air-fuel mixture from the air-fuel mixture supply path; an opening / closing means capable of opening and closing the discharge path; and a calorimeter measuring means for measuring the heat amount of the air-fuel mixture discharged from the discharge path to the outside. Provided,
There is provided judgment means for judging whether or not the heat quantity measured by the heat quantity measurement means belongs to a compatible heat quantity range suitable for operation of the combustion device.

  According to the above characteristic configuration, the air-fuel mixture remaining in the air-fuel mixture supply path in which the amount of heat does not belong to the compatible heat amount range suitable for the operation of the combustion device is the air-fuel mixture introduced into the air-fuel mixture supply path. It can be discharged from the discharge path in an extruded state. When this determination result is output and displayed in this release state, the user of the mixture supply system switches the state of the system from the state of releasing the mixture from the discharge passage to the state of supplying the mixture to the combustion device. The combustion apparatus can be operated satisfactorily by releasing the air-fuel mixture without excess or deficiency.

Furthermore, regarding the configuration for automatically executing the determination of the heat quantity range by the determination means,
Before supplying the air-fuel mixture from the air-fuel mixture supply path to the combustion device, the open / close means is opened while the air-fuel mixture is introduced into the air-fuel mixture supply path, and the air-fuel mixture is supplied from the opening / closing means. The opening / closing means is closed, on condition that the discharge of the air-fuel mixture remaining in the passage is started to the outside, and the determination means determines that the amount of heat of the air-fuel mixture belongs to the adaptive heat amount range. There is an air-fuel mixture supply control means for supplying the air-fuel mixture from the air-fuel mixture supply path to the combustion device.

Even with the above-described feature configuration, the air-fuel mixture remaining in the air-fuel mixture supply path in which the amount of heat does not belong to the adaptive heat amount range suitable for the operation of the combustion apparatus is pushed out by the air-fuel mixture introduced into the air-fuel mixture supply path. It can be discharged from the discharge path in a state. And, since it is determined that the heat quantity of the air-fuel mixture belongs to the compatible heat quantity range suitable for the combustion of the combustion device, the open / close means is closed, so that only the air-fuel mixture whose heat quantity does not belong to the compatible heat quantity range is released. be able to. Thereby, the excessive discharge | release of air-fuel | gaseous mixture can be prevented and the loss of reserve fuel gas can be suppressed.
In addition, in this way, by releasing the air-fuel mixture whose calorie does not belong to the compatible heat quantity range from the gas mixture supply path, the air-fuel mixture supply path is filled with the air-fuel mixture whose calorific value belongs to the compatible heat quantity range. By supplying the air-fuel mixture from the air-fuel mixture supply path to the combustion device in this state, the air-fuel mixture whose calorific value is in the compatible heat quantity range suitable for the operation of the combustion device is supplied to the combustion device. It can be operated.

A further characteristic configuration of the air-fuel mixture supply system according to the present invention is:
The mixture supply path includes a connection part to which a normal gas flow path through which the normal fuel gas flows is connected to the mixture supply path;
An air-fuel mixture generating section that mixes air with the preliminary fuel gas to generate the air-fuel mixture;
A flow for an air-fuel mixture in which the connection portion and the combustion device are connected, a common supply path through which the normal fuel gas or the air-fuel mixture flows, and a connection portion and the air-fuel mixture generation portion are connected, and the air-fuel mixture flows. Composed of roads,
An air-fuel mixture supply state in which the common supply path and the air-fuel mixture flow path are connected to the connecting portion to supply the air-fuel mixture to the combustion device, and the common supply path and the normal gas flow path A switching means that is switchable between a normal fuel gas supply state that is connected to supply the normal fuel gas to the combustion device;
The discharge path is provided at a position closer to the switching means than the connection portion in the air-fuel mixture flow path.

According to the above characteristic configuration, in the air-fuel mixture supply path, since the normal fuel gas flows through the common supply path from the connection portion provided with the switching means to the combustion device, the air-fuel mixture is generated in the flow path portion where the air-fuel mixture remains. It can be limited to the range of only the air-fuel mixture flow path from the part to the connection part provided with the switching means.
In the air-fuel mixture flow path from the air-fuel mixture generating section to the switching means where the air-fuel mixture remains, a discharge path is provided at a position closer to the switching means than the connection section, so that the air-fuel mixture generating section newly mixes A state in which the remaining air-fuel mixture is pushed out toward the discharge path close to the switching means and the newly generated air-fuel mixture remains by introducing air into the air-fuel mixture flow path The remaining air-fuel mixture can be discharged from the discharge portion while being replaced with air.
As a result, the remaining air-fuel mixture is sequentially released from the discharge passage while the air-fuel mixture flow path is filled with the newly generated air-fuel mixture, thereby preventing excessive release of the newly generated air-fuel mixture. In addition to suppressing the loss of the reserve fuel gas, the air-fuel mixture suitable for the combustion of the combustion device can be supplied from the air-fuel mixture flow path to the combustion device, and the combustion device can be operated properly. it can.

A further characteristic configuration of the air-fuel mixture supply system according to the present invention is:
The output means for outputting the determination result of the determination means is provided.

  According to the above characteristic configuration, it can be confirmed by the output means that the amount of heat of the air-fuel mixture has entered the state of the adaptive heat amount range, and the air-fuel mixture channel is filled with the air-fuel mixture in the state of the appropriate heat amount range. Then, it can be determined that the air-fuel mixture in the air-fuel mixture flow path is in a state where it can be supplied to the combustion device.

A further characteristic configuration of the air-fuel mixture supply system according to the present invention is:
The air-fuel mixture generating unit is configured by a venturi mixer that generates air-fuel mixture by sucking air by the suction force generated by the supply of the preliminary fuel gas and mixing the air with the preliminary fuel gas. is there.

  According to the above characteristic configuration, the supply of the preliminary fuel gas to the mixture generation unit generates the mixture and introduces the mixture into the mixture supply path. Therefore, only by supplying the preliminary fuel gas to the mixture generation unit, A state in which the air-fuel mixture remaining in the air-fuel mixture supply path is pushed out toward the discharge path by the newly generated air-fuel mixture, and the air-fuel mixture remaining in the air-fuel mixture supply path is replaced with the newly generated air-fuel mixture. In the state, the remaining air-fuel mixture can be discharged from the discharge portion.

A further characteristic configuration of the air-fuel mixture supply system according to the present invention is:
The combustion device includes an internal combustion engine that is operated using the normal fuel gas or the air-fuel mixture as fuel, a power generation device that generates electric power using the internal combustion engine as a power source, and exhaust heat recovery that recovers exhaust heat generated in the internal combustion engine. The present invention resides in a cogeneration system including an apparatus and an exhaust purification catalyst that purifies exhaust gas discharged from the internal combustion engine.

  According to the above characteristic configuration, the air-fuel mixture remaining in the air-fuel mixture supply path is discharged, and the air-fuel mixture suitable for combustion of the internal combustion engine newly generated in the air-fuel mixture generation unit is supplied to the internal combustion engine. Thus, it is possible to obtain an optimum operating state from the start of operation of the internal combustion engine, and it is possible to generate power with high thermal efficiency by a power generation device that generates power using the internal combustion engine as a power source.

Schematic of the air-fuel mixture supply system according to this embodiment Configuration diagram of mixture release device and mixture generation device The figure which shows the time when it judges that the calorific value of the air-fuel mixture belongs to the applicable calorific value range Diagram showing the wobbe index range for gas engines and the wobbe index range for burners

Hereinafter, an air-fuel mixture supply system according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the air-fuel mixture supply system 1 according to the present embodiment includes a plurality of combustion apparatuses that burn by receiving a supply of city gas G <b> 1 (corresponding to normal fuel gas) flowing through a city gas flow path 2. The supply of LP gas G2 is received from an LP gas tank 3 (corresponding to a reserve fuel gas tank) storing LP gas G2 (corresponding to a reserve fuel gas) different from the city gas G1 with S as a supply target of the air-fuel mixture M, An air-fuel mixture supply path 4 for supplying an air-fuel mixture M obtained by mixing the LP gas G2 with air A to the combustion device S is provided. The air-fuel mixture M is generated by the air-fuel mixture generating device N provided in the air-fuel mixture supply path 4.
Thereby, when supply of city gas G1 is no longer received by the city gas flow path 2, the combustion apparatus S uses the mixture M of LP gas G2 and air A supplied in the mixture supply path 4. Combustible.

  As shown in FIG. 1, the gas flow path through which the city gas G1 and the LP gas G2 flow in the air-fuel mixture supply system 1 is a city gas flow path 2 (corresponding to a normal gas flow path) and an air-fuel mixture flow path 21. Are connected at the connection portion 5, and a single common flow path 6 is formed downstream from the connection portion 5. And the common flow path 6 branches in the branch part 7 of the downstream of the common flow path 6, and the supply path 8 for gas engines and burner connection which are connected with the cogeneration system S1 as the combustion apparatus S mentioned later and the heating apparatus S2 A supply path 9 is formed. Here, the common supply path 20 includes a common flow path 6, a branch portion 7, a gas engine supply path 8, and a burner supply path 9.

  The air-fuel mixture supply path 4 for supplying the air-fuel mixture M to the combustion device S has a connecting portion 5 to which the city gas flow path 2 through which the city gas G1 flows is connected to the LP gas G2 by mixing the air A with the air-fuel mixture M. The venturi mixer 31 (corresponding to the air-fuel mixture generating section, see FIG. 2) of the air-fuel mixture generating apparatus N for generating the air-fuel mixture generating apparatus N is connected to the connecting section 5 and the venturi mixer 31, and the air-fuel mixture flow path 21 through which the air-fuel mixture M flows And the connection part 5 and the combustion apparatus S are connected, and it is comprised by the common supply path 20 through which the city gas G1 or the air-fuel mixture M flows.

  The connecting portion 5 is connected to the common supply passage 20 and the air-fuel mixture passage 21 to form the air-fuel mixture supply passage 4, and the mixture supply state for supplying the air-fuel mixture M to the combustion device S and the common supply passage A switching means 10 is provided that is switchable between a city gas supply state in which the city gas G1 is supplied to the combustion device S by connecting the city gas channel 20 to the city gas flow path 2.

  A discharge passage 22 for discharging the mixture M remaining in the mixture passage 21 to the outside is connected to the mixture passage 21 of the mixture supply passage 4. The discharge path 22 is connected to a connection position 21 a that is as close as possible to the switching means 10 in the range between the air-fuel mixture generating device N of the air-fuel mixture flow path 21 and the switching means 10. The discharge path 22 is provided with a mixture discharge device P that controls the discharge of the mixture M.

  As the combustion apparatus S, a cogeneration system S1 (corresponding to a combustion apparatus) having a gas engine V1 (corresponding to an internal combustion engine) in which the appropriate combustion range of the Wobbe index of the mixture M is the Wobbe index range W1 for the gas engine. ) And a heating device S2 (corresponding to a combustion device) having a burner V2 in which the appropriate combustion range is a Wobbe index range W2 for burners different from the Wobbe index range W1 for gas engines.

  A gas engine supply path 8 for supplying the city gas G1 or the air-fuel mixture M to the gas engine V1 and a burner supply path 9 for supplying the city gas G1 or the air-fuel mixture M to the burner V2 are provided. 6 is connected to the common flow path 6 and the gas engine supply path 8 to connect the common flow path 6 and the gas engine supply path 8 to the gas engine V1 and supply the city gas G1 to the gas engine V1. A combustion apparatus side three-way valve 11 is provided that connects the path 6 and the burner supply path 9 and can selectively select a burner connection state in which the city gas G1 or the mixture M can be supplied to the burner V2. ing.

  The cogeneration system S1 includes a gas engine V1, an exhaust purification catalyst 12 that purifies the exhaust gas E of the gas engine V1, a power generation device 13 that generates power using the gas engine V1 as a power source, and exhaust gas generated by the gas engine V1. An exhaust heat recovery device 14 that recovers heat is provided. On the other hand, the heating device S2 includes a burner V2 and an ignition means 15.

In the cogeneration system S1, the opening of a throttle valve (not shown) is adjusted so that the gas engine V1 increases or decreases its output in accordance with the load from the power generation device 13. The power generation device 13 is driven by the gas engine V1 and is configured to be able to supply power generated by linking with a commercial power system (not shown) to the commercial power system.
On the other hand, the exhaust heat recovery device 14 includes an exhaust gas heat exchanger 19 that circulates and heats water supplied to the hot water storage tank 17 with the exhaust gas E discharged from the gas engine V1. The exhaust heat recovery device 14 is configured to recover the exhaust heat of the exhaust gas E by operating a circulation pump (not shown) to circulate the water in the hot water storage tank 17 to the exhaust gas heat exchanger 19. And the warm water heated by the exhaust heat of the collect | recovered waste gas E is stored in the hot water storage tank 17, and the warm water is comprised so that hot water can be supplied to heat loads (not shown), such as a hot-water supply location and a heating apparatus.

  On the other hand, in the heating device S2, the burner V2 premixes air with the city gas G1 or the air-fuel mixture M supplied through the burner supply passage 9, and burns it with the flame nozzle of the burner V2. For example, various types of general burners are applicable, such as a type that is provided immediately before the flame nozzle of the burner V2 and premixes the city gas G1 or the air-fuel mixture M with air. The heating device S2 is provided with an ignition means 15 that can ignite the burner V2.

  Further, the exhaust purification catalyst 12 that purifies the exhaust gas E of the gas engine V1 can be configured as, for example, a three-way catalyst configured by supporting iridium on an inorganic oxide mainly composed of zirconium oxide. As a result, the methane which is the main component of the unburned city gas G1 discharged into the exhaust gas E or the propane which is the main component of the LP gas G2 discharged into the exhaust gas E is made to be a reducing agent while the exhaust gas E has excellent low temperature purification performance even at low temperatures. As a result, nitrogen oxides in the exhaust gas E can be purified.

Next, the air-fuel mixture discharge device P provided in the discharge path 22 for discharging the air-fuel mixture M from the air-fuel mixture channel 21 to the outside will be described with reference to FIG.
The air-fuel mixture releasing device P includes an opening / closing means 23 that can freely open and close the discharge path 22, a calorific value measuring means 24 that measures a calorific value Q (corresponding to the heat quantity) of the air-fuel mixture M discharged from the discharge path 22 to the outside, The air-fuel mixture supply control means 25 for controlling the opening and closing of the means 23 and the determination means 27 for determining whether or not the calorific value Q measured by the calorific value measurement means 24 belongs to the compatible heat quantity range Qr suitable for the operation of the combustion device S. And a display unit 26 as output means for outputting the judgment result of the judgment means 27. Here, the determination unit 27 is provided in the mixture supply control unit 25 in a state where information can be exchanged with the mixture supply control unit 25.

The opening / closing means 23 is composed of an electromagnetic valve whose opening / closing is controlled by the air-fuel mixture supply control means 25, and is provided at a position upstream of the flow of the air-fuel mixture M in the discharge path 22 in the discharge path 22. It has been.
Further, the calorific value measuring means 24 measures the calorific value Q of the air-fuel mixture M discharged to the outside from the discharge path 22, and has a quick measurement response and excellent stability. For example, the air-fuel mixture M is allowed to flow through a heated filament or the like, the temperature rise of the filament or the like is detected, and the calorific value Q is measured. It is also possible to calculate the Wobbe index of the mixture M from the measured calorific value Q.

Before supplying the mixture M from the mixture supply path 4 to the combustion device S, the mixture supply control means 25 opens the opening / closing means 23 with the mixture M introduced into the mixture supply path 4. The discharge of the air-fuel mixture M remaining in the air-fuel mixture supply passage 4 from the discharge passage 22 is started.
Then, the opening / closing means 23 is set to the closed state on condition that the display unit 26 outputs the determination result together with the determination result that the calorific value Q of the air-fuel mixture M belongs to the adaptive heat amount range Qr in the determination means 27. Then, the remaining mixture M is released from the discharge path 22 and the mixture M is supplied from the mixture supply path 4 to the combustion device S.

Specifically, the air-fuel mixture supply control means 25 sets the switching means 10 to the city gas supply state so that the air-fuel mixture M does not flow into the common supply path 20 in the air-fuel mixture supply path 4. In the state where the air-fuel mixture M is generated in the venturi mixer 31 provided on one end side of the air-fuel mixture flow path 21 and the generated air-fuel mixture M is introduced into the air-fuel mixture flow path 21, the air-fuel mixture flow path 21 The opening / closing means 23 of the discharge path 22 provided on the other end side of the is opened. Then, with the mixture M introduced into the mixture flow path 21 in the mixture supply path 4, the mixture M remaining in the mixture flow path 21 in the mixture supply path 4 is pushed out, Released from the discharge path 22.
Note that the air-fuel mixture M remaining between the connection position 21a to which the discharge passage 22 is connected and the switching means 10 is released by the introduction of the air-fuel mixture M into the air-fuel mixture passage 21 by the air-fuel mixture generating device N. It becomes difficult to push out from the path 22. Therefore, in the air-fuel mixture channel 21, the discharge path 22 is provided at the connection position 21 a as close as possible to the switching means 10, thereby reducing the capacity in the range between the connection position 21 a and the switching means 10 as much as possible. The amount of the air-fuel mixture M remaining without being discharged from the passage 22 is reduced.
Then, the judging means 27 judges whether or not the calorific value Q measured by the calorie measuring means 24 belongs to the adaptive heat quantity range Qr suitable for the operation of the combustion device S, and the calorific value Q falls within the adaptive heat quantity range Qr. If determined to belong, the determination result is output to the display unit 26 via the mixture supply control means 25.
When the determination result that the calorific value Q of the air-fuel mixture M belongs to the compatible heat amount range Qr is output to the display unit 26, the air-fuel mixture supply control means 25 closes the opening / closing means 23 and switches the switching means 10 From the city gas supply state to the mixture supply state, the mixture flow path 21 and the common supply path 20 are connected, and the mixture M is supplied from the mixture supply path 4 to the combustion device S.

  When the combustor side three-way valve 11 of the branching section 7 is connected to the gas engine and the mixture M is supplied to the gas engine V1 of the cogeneration system S1, the compatible heat quantity range Qr is the Wobbe index of the mixture M as the gas engine. The gas engine compatible heat quantity range Q1 obtained from the Wobbe index range W1 for the gas engine which is the appropriate combustion range of V1 is set. On the other hand, the combustion apparatus side three-way valve 11 of the branching portion 7 is set in the burner connection state to heat the mixture M When supplying to the burner V2 of the apparatus S2, the Wobbe index of the mixture M is set to the burner compatible heat amount range obtained from the burner Wobbe index range W2, which is the appropriate combustion range of the burner V2.

  Whether the combustion device side three-way valve 11 is in the gas engine connection state or the burner connection state is determined by operating the command switch 32 provided in the command control unit 33 from the command control unit 33 to the gas engine connection state. A signal indicating whether the burner is connected or not is input to the combustion device side three-way valve 11 and controlled. At that time, a signal indicating whether the combustor side three-way valve 11 is in the gas engine connection state or the burner connection state is also input to the determination means 27, and an adaptive heat amount range Qr for the input signal is obtained. The calorific value of the air-fuel mixture M measured by comparing the obtained calorific value range Qr and the calorific value Q of the air-fuel mixture M discharged from the discharge passage 22 measured and input by the heat amount measuring means 24. It is determined whether or not Q belongs to the compatible heat quantity range Qr.

The determination means 27 determines whether or not the air-fuel mixture M belongs to the compatible heat quantity range Qr by determining whether the calorific value Q of the air-fuel mixture M measured by the heat quantity measuring means 24 reaches the compatible heat quantity range Qr. It is determined that M belongs to the compatible heat quantity range Qr.
For example, in the case where the air-fuel mixture M is supplied to the gas engine V1 of the cogeneration system S1, the calorific value Q of the air-fuel mixture M measured by the calorie measuring means 24 and the air-fuel mixture M in the discharge path 22 as shown in FIG. Based on the relationship of the time T from the start of the release, the determination means 27 determines that the gas engine at the time T1 when the calorific value Q measured by the calorie measuring means 24 reaches the gas engine compatible heat quantity range Q1. It is determined that the gas engine is in a state that belongs to the compatible heat amount range Q1 for the gas engine suitable for V1 combustion. Although not shown, when the air-fuel mixture M is supplied to the burner V2 of the heating device S2, the calorific value Q of the air-fuel mixture M measured by the calorific value measuring means 24 and the discharge of the air-fuel mixture M in the discharge passage 22 are similarly released. Based on the relationship of the time T from the start, the determination means 27 determines that the burner V2 suitable for combustion of the burner V2 at the time when the calorific value Q measured by the calorie measuring means 24 reaches the burner compatible heat quantity range. Judged to be in a state that belongs to the applicable heat range.

  Next, the air-fuel mixture generator N will be described with reference to FIG. As shown in FIG. 2, the air-fuel mixture generating apparatus N is configured by a mixture ratio adjusting valve 30 and a venturi mixer 31 provided in the air-fuel mixture supply path 4. The mixture ratio adjustment valve 30 that can adjust the mixture ratio of the gas mixture M includes a gas engine supply state that adjusts the mixture ratio to a gas engine mixture ratio in which the Wobbe index of the gas mixture M is within the Wobbe index range W1 for the gas engine. The burner supply state is adjusted so that the mixing ratio is adjusted to the mixing ratio for the burner in which the Wobbe index of the mixture M is within the wobbe index range W2 for the burner. The mixing ratio adjustment valve 30 is constituted by, for example, a butterfly flow rate adjustment valve.

  Then, as shown in FIG. 2, the venturi mixer 31 injects the LP gas G2 toward the gas flow direction in the venturi pipe 31a provided in the gas mixture supply path 4 and the inlet opening of the venturi pipe 31a. And an air supply port 31c for air A provided in the vicinity of the injection nozzle 31b.

  The Venturi mixer 31 is configured to generate a suction force by the flow of the LP gas G2, to suck the air A by the suction force and mix the air A with the LP gas G2, and a mixing ratio adjustment valve 30 is adjusting the flow rate of the air A sucked into the venturi mixer 31 in a state where the gas flow rate or the gas pressure of the LP gas G2 as the flow state of the LP gas G2 in the mixture supply path 4 is maintained. The mixing ratio can be adjusted. That is, the mixing ratio adjusting valve 30 is configured to be able to adjust the intake amount of the air A to the venturi mixer 31 by switching the opening degree between the gas engine supply state and the burner supply state as described above. Yes.

  Specifically, in the venturi mixer 31, the gas mixture M is blown into the venturi pipe 31a by the LP gas G2 from the injection nozzle 31b, and the air is supplied from the air supply port 31c provided near the inlet of the venturi pipe 31a. A is sucked into the venturi tube 31a at a predetermined rate by the suction force generated by the ejector action, and the air A and the LP gas G2 are mixed to generate an air-fuel mixture M. At that time, the mixing ratio adjusting valve 30 is configured to be able to switch between the gas engine supply state and the burner supply state to adjust the intake amount of the air A into the venturi mixer 31.

  The gas pressure in the LP gas tank 3 is about 0.15 to 1.56 MPa, and this gas pressure is reduced by the pressure regulating valve 34 and supplied to the injection nozzle 31b in the venturi mixer 31 to generate the air-fuel mixture M. ing. Further, the pressure of the air-fuel mixture M is supplied to the combustion device S by the adjustment valve 35 as a desired pressure (for example, 1.5 to 2.5 kPa).

  In addition, the air-fuel mixture generating device N is provided with a command switch 32 that instructs the mixture ratio adjusting valve 30 to switch to the gas engine supply state and to switch to the burner supply state. 33 is a gas engine supply that adjusts the mixture ratio to a gas engine mixture ratio in which the Wobbe index of the mixture M is within the Wobbe index range W1 for the gas engine based on a command from the command switch 32. The opening degree is switched between the state and the burner supply state in which the mixing ratio is adjusted to the mixing ratio for the burner in which the Wobbe index of the air-fuel mixture M is within the wobbe index range W2 for the burner.

  FIG. 4 is a diagram showing the relationship between the Wobbe index (WI) and the maximum combustion rate (MCP) of the city gas G1 and the mixture M. The burner Wobbe index range W2 of the air-fuel mixture M that enables proper combustion in the burner V2 is different depending on the type of the burner V2, but is, for example, a range indicated by a chain line in FIG. 4 (WI = 53.0 to 54.0). Further, the Wobbe index range W1 for the gas engine of the air-fuel mixture M that enables proper combustion in the gas engine V1 varies depending on the type of the gas engine V1, for example, a range indicated by a chain line in FIG. 4 (WI = 56. 0 to 58.0). Further, the Wobbe index range W1 for the gas engine is more preferably in the range of 56.4 to 57.53.

  Here, the Wobbe index WI is represented by WI = Q / SQRT (S), Q is the calorific value of the mixture M, and S is the specific gravity of the mixture M. The reason why the calorific value Q is divided by the square root of the specific gravity S is that the amount of gas mixture M ejected from the fuel nozzles of the gas engine V1 and the burner V2 is proportional to 1 / SQRT (S). Here, the calorific value Q means the total calorific value. Therefore, the Wobbe index is an index indicating the heat input amount of the air-fuel mixture M to the gas engine V1 and the burner V2. The gas engine V1 and the burner V2 have an optimum unique Wobbe index range depending on the combustion method. Therefore, in order for the air-fuel mixture M to burn properly in the gas engine V1 and the burner V2, the air-fuel mixture M supplied to the gas engine V1 is the air-fuel mixture M adjusted within the Wobbe index range W1 for the gas engine. The air-fuel mixture M supplied to V2 needs to be the air-fuel mixture M adjusted within the burner Wobbe index range W2.

  On the other hand, the maximum combustion speed is the maximum value of the combustion speed obtained when the air-fuel mixture M has an air ratio, and is a value unique to the air-fuel mixture M. If this maximum combustion speed deviates from the range in which proper combustion can be obtained, for example, a phenomenon in which the flame floats up from the burner V2 or a phenomenon in which the flame burns back into the burner V2 occurs, making it difficult to ensure stable combustion. . Therefore, the maximum combustion speed of the air-fuel mixture M supplied to the burner V2 needs to be a value within the burner combustion speed range C2 in which stable combustion can be ensured in the burner V2. Similarly, the maximum combustion speed of the gas engine mixture M1 supplied to the gas engine V1 needs to be a value within the gas engine combustion speed range C1 in which stable combustion can be secured in the gas engine V1.

  Thus, the air-fuel mixture M generated with the mixing ratio adjusting valve 30 in the gas engine supply state or the burner supply state is supplied to the gas engine V1 or the burner V2. In the command control unit 33, The operation of the air-fuel mixture supply system 1 when the burner supply state or the gas engine supply state is selected will be described below.

When the operation of the command switch 32 provided in the command control unit 33 is selected to set the mixing ratio adjustment valve 30 to the gas engine supply state,
The command control unit 33 sets the mixture ratio adjustment valve 30 to a gas engine supply state in which the opening degree is smaller than that in the burner supply state, and a smaller amount of air A is supplied into the mixture M than when the burner supply state is set. A gas engine mixture M1 having a higher calorific value Q than the burner mixture M2 is generated. Accordingly, for example, as shown in FIG. 4, the Wobbe index is adjusted to the Wobbe index Wa (for example, Wa = 56.5) within the Wobbe index range W1 for the gas engine that is larger than the Wobbe index range W2 for the burner. In addition, a gas engine mixture M1 having a maximum combustion speed within the gas engine combustion speed range C1 is generated. The gas engine wobbe index Wa is substantially the same as the wobbe index of the city gas G1 supplied from the city gas flow path 2 to the gas engine V1 in the city gas supply state.
In addition, the combustion controller side three-way valve 11 is controlled by the command control unit 33, and the gas engine connection state in which the gas engine supply passage 8 and the common passage 6 are connected is established.
Further, the fact that the gas engine supply state has been selected is transmitted from the command control unit 33 to the mixture supply control means 25.

When the gas mixture supply control means 25 is notified from the command control unit 33 that the gas engine supply state has been selected, the mixture supply control means 25 opens the opening / closing means 23 and releases it to the outside by the heat quantity measurement means 24. The measurement of the calorific value Q of the air-fuel mixture M is started.
Further, the determination means 27 obtains a suitable heat amount range Q1 for the gas engine, which is a suitable heat amount range Qr corresponding to the Wobbe index range W1 for the gas engine, and the obtained suitable heat amount range Q1 for the gas engine and the heat amount measuring means 24. Is compared with the calorific value Q of the air-fuel mixture M measured by the above, and it is determined whether or not the calorific value Q of the measured air-fuel mixture M belongs to the gas engine compatible calorific value range Q1. When it is determined that the calorific value Q of the air-fuel mixture M belongs to the gas engine compatible heat amount range Q1, the determination result is displayed on the display unit 26.
When the determination result is displayed on the display unit 26, the air-fuel mixture supply control means 25 closes the opening / closing means 23 and changes the switching means 10 from the city gas supply state to the air-fuel mixture supply state. The passage 21 and the common supply passage 20 are connected, and an air-fuel mixture M having a calorific value Q in the gas engine compatible heat amount range Q1 is introduced into the common supply passage 20 to the gas engine V1 of the cogeneration system S1. An air-fuel mixture M is supplied. Thereby, cogeneration system S1 can be operated appropriately.

On the other hand, when the operation of the command switch 32 provided in the command control unit 33 is selected to set the mixing ratio adjustment valve 30 to the burner supply state,
The mixture ratio adjusting valve 30 is controlled by the command control unit 33 to be in a burner supply state in which the opening degree is larger than that in the gas engine supply state, and more air A is supplied than in the gas engine supply state. As shown in FIG. 4, for example, as shown in FIG. 4, the mixture M is adjusted to a burner Wobbe index Wb (for example, Wb = 53.5) within the Wobbe index range W2. At the same time, the burner air-fuel mixture M2 whose maximum combustion speed is within the burner combustion speed range C2 is generated.
Further, the combustor side three-way valve 11 is controlled by the command control unit 33, and the burner connection state in which the burner supply path 9 and the common flow path 6 are connected is established.
Further, the selection of the burner supply state is transmitted from the command control unit 33 to the mixture supply control means 25.

When the command control unit 33 informs the mixture supply control means 25 that the burner supply state has been selected, the mixture supply control means 25 opens the opening / closing means 23 and at the same time, the heat quantity measurement means 24 sends it to the outside. The measurement of the calorific value Q of the discharged air-fuel mixture M is started.
Further, the judging means 27 obtains the burner compatible heat quantity range which is the compatible heat quantity range Qr corresponding to the burner Wobbe index range W2, and the burner from which the calorific value Q of the mixture M measured by the heat quantity measuring means 24 is obtained. When it is determined that it belongs to the applicable heat quantity range, the determination result is displayed on the display unit 26.
Then, the air-fuel mixture supply control means 25 is connected to the air-fuel mixture flow path 21 and the common supply path 20 while closing the opening / closing means 23 and changing the switching means 10 from the city gas supply state to the air-fuel mixture supply state. Then, the air-fuel mixture M in which the calorific value Q is in the burner compatible heat amount range is caused to flow into the common supply path 20, and the air-fuel mixture M is supplied to the burner V2 of the heating device S2. Thereby, heating device S2 can be operated appropriately.

  Further, the air-fuel mixture supply system 1 is configured as described above, and in the event of an emergency such as an earthquake, the city gas G1 supply pipe is cut and the city gas G1 is no longer supplied. The air-fuel mixture M is generated by the LP gas G2 and the air A stored in the LP gas tank 3 and supplied to the combustion device S, thereby enabling the combustion device S to be operated.

[Another embodiment]
(A) In the above embodiment, the supply ratio of the air A to the venturi mixer 31 is adjusted by the mixing ratio adjustment valve 30 so that the mixing ratio of the mixture M is adjustable. A flow rate adjusting valve for adjusting the flow rate of the LP gas G2 is provided upstream of the injection nozzle 31b for injecting the LP gas G2 provided in the gas supply path 4, and the supply amount of the LP gas G2 to the venturi mixer 31 is adjusted. Then, the mixture ratio of the air-fuel mixture M may be adjustable, or both the mixture ratio adjusting valve 30 and the flow rate adjusting valve for adjusting the flow rate of the LP gas G2 are provided to the venturi mixer 31 for the air A and the LP gas G2. The supply ratio of the gas mixture M may be adjusted to adjust the mixture ratio of the air-fuel mixture M.

(B) In the above embodiment, the air A supplied to the venturi mixer 31 in the air-fuel mixture supply path 4 is sucked from the air supply port 31c by the suction force generated by the flow of the LP gas G2 and becomes the LP gas G2. Although it is set as the structure mixed, this air A may be supplied to the air supply port 31c in the pressurized state. Thereby, the Wobbe index of the air-fuel mixture M can be quickly adjusted in a wide range.

(C) In the above-described embodiment, the venturi mixer 31 and the adjustment valve 35 are connected only by the mixture supply path 4. However, the invention is not limited to this, and the venturi mixer 31 and the adjustment valve are not limited to this. A small cushion tank in which the air-fuel mixture M is temporarily stored may be provided in between.

(D) In the above embodiment, switching between the gas engine supply state and the burner supply state in the mixing ratio adjusting valve 30 has been described as being based on the selection of the command switch 32. Because of the characteristics of the supply destination of the air-fuel mixture M, information on whether the combustion device S supplying the air-fuel mixture M is the cogeneration system S1 or the heating device S2 is acquired from the cogeneration system S1 and the heating device S2. The mixing ratio adjusting valve 30 is provided with command means for instructing switching to the gas engine supply state and switching to the burner supply state, and the mixing ratio adjusting valve 30 is based on the command from the command means. Switching between the supply state and the burner supply state may be performed.
If it does in this way, accurate information can be obtained automatically from the combustion apparatus S which supplies the air-fuel mixture M, and appropriate combustion can be ensured.

(E) In the above-described embodiment, it is determined that the air-fuel mixture M belongs to the adaptive heat quantity range Qr at the time when the calorific value Q of the air-fuel mixture M measured by the calorie measuring means 24 reaches the adaptive heat quantity range Qr. Not limited to this, when the calorific value Q measured by the calorie measuring means 24 is stable within the adaptive heat quantity range Qr for a predetermined period, it is determined that it belongs to the adaptive heat quantity range Qr. It may be configured.

(F) In the above embodiment, in the discharge path 22, the opening / closing means 23 is provided at a position on the upstream side of the flow of the air-fuel mixture M in the discharge path 22 relative to the calorific value measurement means 24, but this is not restrictive. In the discharge path 22, the opening / closing means 23 may be provided at a position downstream of the heat amount measuring means 24 in the flow of the air-fuel mixture M in the discharge path 22.

(G) In the above embodiment, the discharge path 22 is provided at a position close to the switching means 10 of the mixture flow path 21 in the mixture supply path 4. However, the present invention is not limited to this, and the discharge path 22 is mixed. The air supply path 4 may be provided at a position close to the combustion device S of the common supply path 20.

(H) In the above embodiment, the suitable heat quantity range Qr is obtained based on the Wobbe index range W1 for the gas engine or the Wobbe index range W2 for the burner. However, the present invention is not limited to this. The compatible heat amount range Qr may be obtained based on the Wobbe index Wb for use.

(I) In the above embodiment, the display unit 26 is provided as the output unit, and the determination result of the determination unit 27 is output in the form of being displayed on the display unit 26. You may comprise so that the judgment result of the judgment means 27 may be output with an audio | voice etc.

(J) In the above embodiment, the opening / closing means 23 of the discharge passage 22 is opened and closed according to the calorific value Q of the air-fuel mixture M measured by the calorific value measuring means 24 and automatically performed by the air-fuel mixture supply control means 25. However, regarding the opening / closing of the opening / closing means 23 of the discharge path 22, the judgment means 27 and the output means described so far are provided so that the user is responsible for the output from the output means (for example, A configuration in which the user looks at the display output on the display unit 26 and switches the discharge path 22 from the open state to the closed state may be employed.

(K) In the above embodiment, a plurality of combustion devices S are provided, and the combustion device S that supplies the mixture M is selected by switching the three-way valve 11 on the combustion device side. It is good also as a structure provided only with the apparatus.

(L) In the above embodiment, on condition that the display unit 26 outputs the determination result together with the determination result that the calorific value Q of the air-fuel mixture M belongs to the compatible heat amount range Qr in the determination means 27, Although the opening / closing means 23 is in the closed state, the present invention is not limited thereto, and the opening / closing means 23 may be in the closed state on condition that the determination means 27 determines that the heat generation amount Q of the mixture M belongs to the adaptive heat amount range Qr. Good.

  As described above, it is possible to provide an air-fuel mixture supply system that can supply an air-fuel mixture suitable for combustion in the combustion device while suppressing loss of the reserve fuel gas.

1 Mixture Supply System 2 City Gas Channel (Normal Gas Channel)
3 LP gas tank (spare fuel gas tank)
4 Mixture Supply Path 5 Connection Unit 10 Switching Unit 12 Exhaust Purification Catalyst 13 Power Generation Device 14 Exhaust Heat Recovery Device 20 Common Supply Path 21 Mixture Channel 22 Release Path 23 Opening / Closing Unit 24 Calorie Measurement Unit 25 Mixture Supply Control Unit 26 Display section (output means)
27 Judging means 31 Mixture generation part A Air G1 City gas (normal fuel gas)
G2 LP gas (spare fuel gas)
M Mixture Q Calorific value (calorie)
Qr Applicable heat range S Combustion device V1 Gas engine (internal combustion engine)

Claims (6)

Combustion apparatus that receives normal fuel gas and burns, and reserve fuel gas tank that stores reserve fuel gas different from the normal fuel gas, mix air with the reserve fuel gas supplied from the reserve fuel gas tank. An air-fuel mixture supply path for supplying the air-fuel mixture to the combustion device,
An air-fuel mixture supply system in which the combustion device can combust with the air-fuel mixture supplied in the air-fuel mixture supply path,
A discharge path for discharging the air-fuel mixture from the air-fuel mixture supply path; an opening / closing means capable of opening and closing the discharge path; and a calorimeter measuring means for measuring the heat amount of the air-fuel mixture discharged from the discharge path to the outside. Provided,
An air-fuel mixture supply system comprising: a determination unit that determines whether or not the amount of heat measured by the heat amount measurement unit belongs to a compatible heat amount range suitable for operation of the combustion device.   Before supplying the air-fuel mixture from the air-fuel mixture supply path to the combustion device, the open / close means is opened while the air-fuel mixture is introduced into the air-fuel mixture supply path, and the air-fuel mixture is supplied from the opening / closing means. The opening / closing means is closed, on condition that the discharge of the air-fuel mixture remaining in the passage is started to the outside, and the determination means determines that the amount of heat of the air-fuel mixture belongs to the adaptive heat amount range. The air-fuel mixture supply system according to claim 1, further comprising air-fuel mixture supply control means for supplying the air-fuel mixture to the combustion device from an air-fuel mixture supply path. The mixture supply path includes a connection part to which a normal gas flow path through which the normal fuel gas flows is connected to the mixture supply path;
An air-fuel mixture generating section that mixes air with the preliminary fuel gas to generate the air-fuel mixture;
A flow for an air-fuel mixture in which the connection portion and the combustion device are connected, a common supply path through which the normal fuel gas or the air-fuel mixture flows, and a connection portion and the air-fuel mixture generation portion are connected, and the air-fuel mixture flows. Composed of roads,
An air-fuel mixture supply state in which the common supply path and the air-fuel mixture flow path are connected to the connecting portion to supply the air-fuel mixture to the combustion device, and the common supply path and the normal gas flow path A switching means that is switchable between a normal fuel gas supply state that is connected to supply the normal fuel gas to the combustion device;
3. The air-fuel mixture supply system according to claim 1, wherein the discharge path is provided in a position closer to the switching unit than the connection portion in the air-fuel mixture flow path.   The air-fuel mixture supply system according to any one of claims 1 to 3, further comprising an output unit that outputs a determination result of the determination unit.   The air-fuel mixture generating unit is configured by a venturi mixer that generates air-fuel mixture by sucking air by suction force generated by supplying the preliminary fuel gas and mixing the air with the preliminary fuel gas. 3. The gas mixture generation system according to 3.   The combustion device includes an internal combustion engine that is operated using the normal fuel gas or the air-fuel mixture as fuel, a power generation device that generates electric power using the internal combustion engine as a power source, and exhaust heat recovery that recovers exhaust heat generated in the internal combustion engine. The air-fuel | gaseous mixture supply system as described in any one of Claims 1-5 comprised by the cogeneration system provided with the apparatus and the exhaust gas purification catalyst which purifies the exhaust gas discharged | emitted from the said internal combustion engine.

Images