JPH0689655B2 - Power generator - Google Patents

Description

The present invention relates to a power generator using a gas combustion expander including a screw expander, a gas turbine and other gas combustion expanders, and more particularly to the gas combustion. The present invention relates to a power generation device that effectively uses exhaust gas from an expansion device.

“Conventional technology and its problems” Currently, power generators using combustion expanders with gas turbines are expanding their applications from large to medium-sized and small, and if tens of thousands of KW are large, then thousands of KW is in the medium-sized region. , Hundreds of KW are classified as small fields.

The power generators used in the medium-sized to the small-sized regions need to be packaged in a small size, and also need to be installed together in a case for soundproofing.

On the other hand, since the city gas sent to the gas turbine combustion expander needs to be boosted once, a fuel gas compressor is used.
Since the compressor is driven by an electric motor, it cannot be integrated with the power generator, and is generally installed in a separate room with an explosion-proof chamber, and an explosion-proof electric motor must be used as a driving motor. Nakatsuta.

Therefore, there are various problems such that the whole device cannot be packaged even in the medium-sized and small-sized power generators, the space is separated and explosion-proof equipment is required, and the equipment cost increases.

Further, the exhaust gas temperature of the gas turbine in the power generator is higher than the engine exhaust gas temperature, and it has been proposed that a technique utilizing this is to attach an exhaust gas boiler to obtain low pressure steam to obtain electric power. If it is used in steam turbine power generation because it is inefficient and strong, it will be more costly due to its small size, and it will be difficult to realize in practice.

In view of the above-mentioned drawbacks of the prior art, the present invention has an object to integrally package the entire gas expander power generator by driving the fuel gas compressor without using an electric motor.

Another object of the present invention is to use energy obtained from the exhaust gas boiler with high efficiency.

"Means for Solving Problems" The present invention is to solve the above problems. The present invention relates to volume expansion driven by steam from an exhaust gas boiler in a power generator using a gas combustion expander such as a gas turbine. The gas combustion expansion is performed in order to perform power recovery by interlocking the generators, drive the fuel gas compressor with the generator as both shafts without using the electric motor, and enable highly efficient driving of the gas combustion expander. The compressed air from the air compressor connected to the other shaft side of the machine is guided to the combustion chamber together with the compressed fuel gas from the fuel gas compressor.

That is, the present invention is a screw expander, a gas turbine or other gas combustion expander, an air compressor for introducing compressed air into the combustion chamber on one side, and a fuel gas consisting of a generator and a positive displacement rotary compressor on the other side. Compressors are directly or indirectly connected to each other, the compressed fuel gas from the fuel gas compressor is supplied into the combustion chamber and burned with the compressed air from the air compressor, and the combustion gas is injected into the gas combustion expander. Power is generated, the steam expander is driven by steam from an exhaust gas boiler that uses the exhaust gas from the gas combustion expander as a heat source, and the power recovered by the steam expander is used as the fuel gas compressor. It is characterized in that the fuel gas compressor is configured to be capable of being driven to the side.

By this, the fuel gas compressor can be driven without using an electric motor, and since there is no need to use an electric motor, there is no need for explosion protection and the entire power generator can be packaged, achieving soundproofness and compactness. To be done.

In this case, since a positive displacement rotary compressor, for example, a screw compressor is used as the fuel gas compressor, the fuel gas compressor can be driven smoothly even if the load of the gas combustion expander changes.

In this case, it is preferable to connect a generator to the gas combustion expansion device via a transmission.

Further, the present invention drives the steam expander with steam from an exhaust gas boiler that uses the exhaust gas from the gas combustion expander as a heat source, and transfers the power recovered by the steam expander to the generator side. By doing so, the power of the fuel expander can be obtained by the power obtained from the steam expander, and the energy of the exhaust gas boiler can be used efficiently, and the fuel gas compressor is installed on the output shaft side of the generator. The transmitted energy of the gas combustion expander due to the connection is not reduced.

In this case, since the steam from the exhaust gas boiler has a two-layer flow of gas-liquid mixture, it is preferable to use a positive displacement rotary compressor such as a screw expander as the steam expander.

Further, according to the present invention, compressed fuel gas from the fuel gas compressor is supplied into a combustion chamber and burned together with compressed air from an air compressor, and the combustion gas is injected into the gas combustion expander to generate power. With this configuration, it is possible to drive the gas combustion expander with high efficiency.

Further, according to a preferred embodiment of the present invention, since the induction motor is used for the generator, at the time of starting the gas combustion expander,
If the induction motor is rotated by using a commercial power source and the rotational force is transmitted to the gas combustion expander, a special starter is not required, and accordingly, the device can be downsized, and the installation cost and operating cost can be reduced. It is possible to reduce the number and simplify the configuration.
In this case, by using an induction-controllable induction motor for the generator, it is possible to freely change the rotation speed and the like, which facilitates smoother starting.

On the other hand, on the contrary, a combustion device having a gas or liquid fuel as a heat source is attached to the exhaust gas boiler, and the steam generated by performing combustion of the exhaust gas boiler in advance at the time of starting the power generator is guided to the steam expander, and the steam expansion is performed. The steam expander may be made to function as a starter of the gas combustion expander by transmitting the driving force of the machine to the gas combustion expander to start the gas combustion expander. It eliminates the need for a special starting device.

In this case, as the heat source of the combustion device, heavy gas or other special heat source is not required by branching the gas from the fuel gas introduction pipe leading to the fuel gas compressor.

Further, the gas combustion expansion device, the transmission device, the steam expansion device,
The generator and fuel gas compressor are preferably housed together in a package.

A gas turbine, a screw type gas expander, or the like can be used as the gas combustion expander, and an air compressor that supplies air to the combustion chamber of the combustion expander is also coaxially connected to the combustion expander. By using a screw type compressor, packaging can be facilitated and thermal efficiency can be improved.

In a preferred embodiment, the steam expander is driven by steam from an exhaust gas boiler that uses the exhaust gas from the gas combustion expander as a heat source, and the refrigerator is recovered by the power recovered by the expander. Discharge of the exhaust gas boiler by driving and further introducing steam discharged from the steam expander into the absorption refrigerator or / and introducing exhaust gas from the exhaust gas boiler directly into the absorption refrigerator to produce cold water. The most efficient and effective use of energy can be achieved, and no special drive source for the cooling or refrigerating device is required.

Further, since a cooling device is indispensable in the building having the power generation device, it is preferable from this aspect as well, and is particularly suitable for a cogeneration cooling and heating and co-generation power generation system.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be exemplarily described in detail with reference to the drawings. However, the types, sizes, materials, shapes, and the relative arrangements of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified, and are simply It is only an example.

Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a basic configuration diagram of a power generation device using a gas combustion expansion device, where A is a gas combustion expansion device and D is a package that houses the power generation device including the gas combustion expansion device A.

Reference numeral 1 is a gas combustion expander including a gas turbine or a screw expander. An air compressor 2 is provided on the input shaft 11 side, a generator 5 is provided on the output shaft 12 side via a transmission device 4, and an output shaft 14 of the generator 5 is provided.
Fuel gas compressors 6 are connected to the respective sides, and are housed in a package D together with a combustion chamber 3 that supplies combustion gas to the gas combustion expander 1.

A high-pressure fuel gas pipe 29 communicates with the combustion chamber 3 from the fuel gas compressor 6, and burns in the burner 3 ′ together with the compressed air from the gas combustion expander 1 and the air compressor 2 coaxial 11 to expand the combustion gas. 1 to generate power, the driving force of which is transmitted to the generator 5 via the transmission 4 to perform predetermined power generation, and the fuel gas compressor connected to the output shaft 14 side of the generator 5. 6 also rotates in synchronization, and compressed fuel gas is supplied to the burner 3'in the combustion chamber 3 through the high pressure fuel gas pipe 29 by the rotation of the fuel gas compressor 6, and the above operation is repeated.

As a result, a motor for driving the fuel gas compressor 6 and an explosion-proof device attached to the motor are unnecessary, and a package D in which the above devices are integrated can be formed.

As described above, an induction motor, in particular, an induction-controllable induction motor is used as the generator 5, and when the gas combustion expander 1 is started, the induction motor is rotated by using a commercial power source, and its rotational force is changed. If it is configured to be transmitted to the gas combustion expander 1, an air compressor or other special starter is unnecessary.

Further, the fuel gas compressor 6 can be connected to the transmission 4 side of the generator 5, so that it is possible to prevent the entire apparatus from becoming unnecessarily long.

FIG. 2 shows another embodiment aiming at high efficiency utilization of the exhaust gas boiler 8 according to the embodiment of the present invention, B is an exhaust gas boiler system, C is a screw type steam expander and a connection system,
D indicates a package.

In FIG. 2, steam generated in the heat exchanger 23 of the exhaust gas boiler 8 is injected into the screw type steam expander 7 through the conduit 19.

At this time, for example, the temperature from the gas turbine 1 is 600 ° to 700 ° C.
About 10kg / cm ² about pressure from the exhaust gas boiler 8 due to the exhaust gas of
The following compression steam is obtained, and by introducing this into the screw type expander 7, exhaust gas energy power is recovered from the screw type expander 7, and this power is transmitted to the transmission 4
Is added to the generator 5 through.

By the way, if it is assumed that the power from the gas combustion expander 1 can obtain an electric power of about 1,000 KW from the generator 5, the screw type steam expander 7 will output about 100 KW.
Since the output of W is obtained and the fuel gas compressor 6 is about 70 KW, the power of the fuel gas compressor 6 can be obtained by the power obtained by the exhaust gas recovery and smoothly driven, and the output of the generator 5 Is not reduced.

The steam expander 7 is connected to the transmission 4, and is housed in the package D together with the gas combustion power generator system.

On the other hand, in the exhaust gas boiler 8, a steam expander cycle is formed by the condenser 9 and the pump 10.

Further, the exhaust gas boiler 8 is additionally provided with a burner 47 connected to a branch pipe 28 branched from a gas conduit 27.

As a result, the exhaust gas boiler 8 supplies steam to the steam expander 7 during the operation of the gas combustion expander 1 to perform the above operation, but the steam is generated by the combustion of the burner 47 before starting and the steam expander 7 is generated. Upon activation, the gas expander 1 is activated through the transmission 4 to drive the air compressor 2, and the fuel gas compressor 6 is also activated.

As a result, the power is transmitted from the gas combustion expansion device A to the generator 5 to generate power.

Therefore, since the steam expander 7 also functions as a starter, a starter for starting the gas combustion expander 1 becomes unnecessary.

FIG. 3 shows another embodiment for obtaining cold water by utilizing the power and heat energy obtained from the exhaust gas boiler and the steam expander 7, where E is an absorption refrigeration system and F is a refrigeration cycle.

The difference from each of the above embodiments will be mainly described. The steam expander 7 driven by the steam from the exhaust gas boiler 8 has a refrigerator 30 connected to the output shaft side thereof, and the evaporator 30 is driven by the refrigerator 30. Get colder water.

Further, the steam discharged from the expander 7 is introduced into the regenerator 38 of the absorption chiller E through the pipe 33 and becomes a heat source,
Further, the exhaust gas from the exhaust gas boiler 8 is also regenerated through the pipe 22.
Heat 38.

Thereby, cold water can be obtained also from the evaporator 36.

In addition, 39 is an absorber and 40 is a condenser.

Further, the evaporator 36 and the evaporator 35 may be connected in series or may be connected in parallel and used.

According to this embodiment, all the heat energy from the exhaust gas boiler 8 can be used, and if it is further captured, all the combustion heat energy in the combustion chamber 3 can be used as co-generation power, so that there is extremely no waste of co-generation heat. It will be used.

[Advantages of the Invention] As described above, according to the present invention, the fuel gas compressor can be driven by utilizing the rotational force of the gas combustion expander or the generator, and the fuel gas compressor is a screw type. Since it is a fuel gas compressor, it can be driven smoothly even if the load of the gas combustion expansion device fluctuates, which eliminates the need for a special electric motor to drive the fuel gas compressor. As a result, there is no need for explosion protection by driving a motor, and soundproofing and compactness have been achieved, and since it has been made compact, the installation space becomes smaller and the cost can be reduced.

Moreover, the present invention can smoothly drive the fuel gas compressor by utilizing the exhaust gas heat energy from the gas combustion expander whose power is recovered from the exhaust gas boiler, and therefore the power generation efficiency can be significantly increased. .

Further, according to the preferred embodiment of the present invention, since the gas combustion expansion device can be started by utilizing the thermal energy from the exhaust gas boiler, a separately provided starting device is not required, resulting in cost reduction and power generation. It leads to improvement of efficiency.

Further, since it is possible to obtain chilled water such as cooling by using the heat energy from the exhaust gas boiler, not only the power generation efficiency but also the co-generation heat utilization as a co-generation power generator can be achieved without much waste. . It has various remarkable effects.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a power generator of the present invention using a gas combustion expansion device, and FIG. 2 is a flow chart according to an embodiment of the present invention in which the exhaust gas boiler is efficiently used in addition to the basic configuration. 3 is a flow chart showing another embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshi Yamamoto 10 of 32 Sakuragaoka, Kukizaki-cho, Inashiki-gun, Ibaraki Prefecture (72) Inventor Yoichi Katori 6-3 of Togashira, Toride City, Ibaraki Prefecture (56) References 61-40401 (JP, A) Actually opened 61-113196 (JP, U) Actually opened 60-104678 (JP, U)

Claims (5)

[Claims] 1. An air compressor for introducing compressed air into a combustion chamber on one side of a gas combustion expander, and a fuel gas compressor consisting of a generator and a positive displacement rotary compressor on the other side, either directly or indirectly. Connected to, the compressed fuel gas from the fuel gas compressor is supplied into the combustion chamber to burn with the compressed air from the air compressor, and the combustion gas is injected into the gas combustion expander to generate power, and The steam expander is driven by steam from an exhaust gas boiler that uses the exhaust gas from the gas combustion expander as a heat source, and the power recovered by the steam expander is transmitted to the fuel gas compressor side. Power generator characterized by being configured to drive a compressor 2. The power generator according to claim 1, wherein the generator is used as an induction motor, and is rotated as an induction motor when the gas combustion expander is started to function as a starter of the gas combustion expander. 3. The exhaust gas boiler is provided with a combustion device using a gas or liquid fuel as a heat source, and the steam generated by previously combusting the exhaust gas boiler at the time of starting the power generator is guided to a steam expander, and the steam is expanded. The power generator according to claim 1, wherein the driving force of the expander is transmitted to the gas combustion expander for starting. 4. A power generator according to claim 3, wherein a gas is branched from a fuel gas introduction pipe leading to a fuel gas compressor and guided to the combustion device. 5. The refrigerator is driven by the power recovered by the steam expander, while the exhaust gas discharged from the steam expander and / or the exhaust gas boiler is introduced into an absorption refrigerator. A cold water generator is used to produce cold water according to claim 1.