JP3221123B2 - Gas turbine device equipped with evaporator for LPG mixed water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine apparatus using LPG as a fuel, and more particularly to a gas turbine cycle used in the field of gas turbine cogeneration to realize energy saving and low NOx.

[0002]

2. Description of the Related Art The configuration of a conventional two-fluid cycle gas turbine apparatus (hereinafter simply referred to as a gas turbine apparatus) using LPG as a fuel is, for example, as shown in FIG. In this figure, 20 is a compressor, 21 is a turbine, 22 is a combustor,
23 is a power generator, 24 is an LPG evaporator, 25 is a waste heat boiler, 26 is a feed water heater, 27 is a feed water pump, 28 is a steam flow control valve, 29 is an exhaust chimney, and 29 is an exhaust chimney. Is the combustor 2 after being compressed by the compressor 20
Flow into 2. The compressed air flowing into the combustor 22 is LPG
The combustion of the gas 7 (evaporated gas of LPG) turns into a high-temperature combustion gas, which is mixed with the steam 5 generated by the exhaust heat of the turbine 21 and flows into the turbine 21. Turbine 21
The exhaust gas boiler 3 that has worked in the step (a) generates utility steam 8 in the exhaust heat boiler 25, and then is exhausted to the atmosphere through the feed water heater 26 and the exhaust chimney 29. The work generated by the turbine 21 drives the compressor 20 and simultaneously drives the generator 23 to generate the electric power 2. A feed water heater 26 that is heated by the gas turbine exhaust 3 is disposed downstream of the exhaust heat boiler 25. In such a conventional gas turbine device, the heat exchange in the feed water heater 26 is a sensible heat exchange between the gas turbine exhaust and water.

[0003]

The above-mentioned conventional gas turbine device has the following problems. (1) LPG in liquid state as fuel for gas turbine
(Hereinafter referred to as liquid LPG) to evaporating gas 7 of LPG.
(Hereinafter referred to as LPG gas), and for this purpose, it is necessary to provide an external LPG evaporator 24 and consume extra heat. (2) Since the temperature level in the feed water heater 26 is relatively low (for example, 200 ° C. or less), high-pressure steam cannot be generated. (3) When the steam 5 having a sufficient pressure to be supplied to the gas turbine is generated by the gas turbine exhaust 3, it is impossible to recover the gas turbine exhaust to 100 ° C. or lower.

The present invention has been made to solve such a problem. That is, an object of the present invention is to eliminate the need for a separate evaporator for evaporating the liquid LPG and an external heat source therefor, while at the same time having sufficient pressure to be injected into the combustor of the gas turbine. It is an object of the present invention to provide a gas turbine device provided with an LPG mixing evaporator that can obtain steam.

[0005]

According to the present invention, an LPG is provided.
Gas turbine using gas as fuel, exhaust heat boiler using gas turbine exhaust as heat source, LPG / water mixer that mixes liquid LPG and water to produce LPG mixed water, and gas turbine exhaust as heat source An evaporator for LPG mixed water for evaporating the LPG mixed water, a steam-water separator for separating a mixed gas of LPG gas and water vapor evaporated by the evaporator and hot water, and a mixture separated by the steam-water separator. A gas line for supplying gas to a combustor of the gas turbine, and a hot water line for supplying hot water separated by the steam-water separator to the waste heat boiler. Provided is a gas turbine device having the same. According to a preferred embodiment of the present invention, in the evaporator for mixed LPG water, heat exchange is performed by gas-liquid equilibrium between liquid LPG and water. Further, the evaporator for LPG mixed water heats a mixture of liquid LPG and water through a heat transfer wall by exhaust of a gas turbine, evaporates a part of the liquid LPG and water, and a predetermined amount is provided at an outlet of the evaporator. The proportions are LPG gas, steam and hot water. Further, it is preferable that the apparatus further includes a device for measuring liquid LPG and a device for measuring water on the upstream side of the LPG / water mixer.

[0006]

According to the configuration of the present invention, an LPG / water mixer for mixing liquid LPG and water to produce LPG mixed water;
An LPG mixed water evaporator for evaporating the LPG mixed water using the exhaust gas of the gas turbine as a heat source;
By evaporating the liquid LPG by the mixed water evaporator, a separate evaporator for evaporating the liquid LPG and an external heat source therefor can be eliminated. The gas turbine further includes a steam separator for separating a mixed gas of LPG gas and water vapor evaporated by an evaporator and hot water, and a gas line for supplying the mixed gas separated by the steam separator to a combustor of the gas turbine. Therefore, it is possible to obtain steam having a pressure sufficient to be injected into the combustor of the gas turbine.

That is, the present invention uses a mixture of liquid LPG and water as a medium to be heated in an evaporator for LPG mixed water, and utilizes gas-liquid equilibrium heat exchange of both substances. In other words, a phenomenon is used in which the medium to be heated, which is a two-fluid mixture, evaporates at a predetermined rate at each temperature during the heat exchange process. This eliminates the need for a separate evaporator for evaporating the liquid LPG and an external heat source therefor, and also enables the mixed water to evaporate at a relatively low temperature. In the heat exchange process in the evaporator, it is possible to obtain steam having a sufficient pressure to be injected into the combustor of the gas turbine.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for common parts in each drawing. FIG. 1 is an overall configuration diagram showing a preferred embodiment of a gas turbine device according to the present invention. In this figure, a gas turbine device equipped with an LPG mixed water evaporator according to the present invention includes a gas turbine (composed of a compressor 20, a turbine 21, and a combustor 22) using LPG gas as fuel, and An exhaust heat boiler 25 using exhaust gas as a heat source, an LPG / water mixer 34 for mixing the liquid LPG 6 and the water 9 to generate LPG mixed water, and a turbine 21
LP for evaporating the LPG mixed water using the exhaust gas of the above as a heat source
G mixed water evaporator 36 and L evaporated by evaporator 36
A steam-water separator 32 for separating a mixed gas 11 of PG gas and steam and hot water 10, and an LPG separated by the steam-water separator 32
The mixed gas 11 of gas and steam is supplied to the combustor 2 of the gas turbine.
2 and a hot water line for supplying the hot water 10 separated by the steam separator 32 to the exhaust heat boiler 25.

The LPG / water mixer 34 is arranged on the upstream side of the line of the medium to be heated of the evaporator 36 for LPG mixed water. The evaporator 36 is connected to the gas turbine exhaust 3 as a heating medium and a two-phase four-fluid heating medium (water,
Heat exchange with water vapor, liquid LPG, LPG gas). As a result, the fluid at the outlet of the evaporator 36 on the side of the medium to be heated is composed of two-phase three fluids (saturated water, water vapor, and LPG gas). A steam separator 32 is provided to separate these two-phase fluids. Further, as shown in the figure, a gas line for sending the mixed gas 11 (LPG gas, steam) separated by the steam separator 32 to the combustor 22 and a separated hot water 10 (saturated water) for the waste heat boiler 25. It is equipped with a hot water line for supplying water.

FIG. 2 shows a mixed gas 11 of LPG gas and water vapor separated by a steam separator 32 and a combustor 22 of a gas turbine.
FIG. 3 is a detailed view of a gas line supplied to the apparatus. As shown in the figure, a fuel gas control valve 35 for controlling the flow rate of the mixed gas 11 in response to a signal from a control device (not shown) of the gas turbine is provided downstream of the steam separator 32. . FIG. 3 is a detailed view of an upstream line of the LPG / water mixer 34. As shown in the figure, it is preferable to separately provide a feedwater flow control valve 38 and an LPG flow control valve 37 upstream of the LPG / water mixer 34.

The gas turbine apparatus provided with the evaporator for mixed LPG water according to the present invention shown in FIG. 1 operates as follows. 1. The operation of the working air and the combustion gas is the same as that of the conventional gas turbine device. 2. After the liquid LPG and water are mixed in the LPG / water mixer 34, they flow into the evaporator 36. In the evaporator 36, both the water and the liquid LPG evaporate at a predetermined rate by the gas turbine exhaust 3 through the heat transfer wall, and at the outlet of the evaporator 36, the two phases 3 of the LPG gas, the water vapor, and the saturated water It will be in a fluid state. FIG. 4 shows an example of the heat exchange process in the evaporator 36 for LPG mixed water. As is clear from FIG. 4, a mixture of liquid LPG and water is used as a medium to be heated in the LPG mixed water evaporator 36, and the two substances perform gas-liquid equilibrium heat exchange. At each temperature of the medium during the heat exchange process, both fluids evaporate at a predetermined rate. Therefore, the mixed water can be evaporated at a relatively low temperature and can have a sufficient pressure for charging the combustor of the gas turbine. Further, the gas turbine exhaust gas can be recovered to 100 ° C. or less. For reference, FIG. 5 shows an example of a heat exchange process in a feed water heater in a conventional gas turbine device. In FIG. 5, the temperature of the feedwater rises linearly because it is merely sensible heat exchange. Also,
Gas turbine exhaust can only be recovered up to around 130 ° C. 3. The LPG gas, water vapor and saturated water that have exited the evaporator are separated into a mixed gas 11 of LPG gas and water vapor and hot water 10 (saturated water) by a steam-water separator 32, and the mixed gas is sent to the combustor 22 as fuel. The saturated water is sent to the waste heat boiler 25 as feed water. 4. The saturated water sent to the waste heat boiler 25 is
The steam is heated in the gas turbine and is turned into steam.
Sent to In this case, a part of the generated steam may be used as the utility steam 8 without being sent to the combustor.

As described above, according to the configuration of the present invention,
LP for mixing liquid LPG and water to produce LPG mixed water
The liquid LPG is provided by evaporating the liquid LPG with the LPG mixed water evaporator that uses the exhaust gas of the gas turbine as a heat source and evaporates the LPG mixed water. A separate evaporator for evaporating the water and an external heat source therefor can be dispensed with. The gas turbine further includes a steam separator for separating a mixed gas of LPG gas and water vapor evaporated by an evaporator and hot water, and a gas line for supplying the mixed gas separated by the steam separator to a combustor of the gas turbine. Therefore, it is possible to obtain steam having a pressure sufficient to be injected into the combustor of the gas turbine.

That is, the present invention uses a mixture of liquid LPG and water as a medium to be heated in an evaporator for LPG mixed water, and utilizes gas-liquid equilibrium heat exchange of both substances. In other words, a phenomenon is used in which the medium to be heated, which is a two-fluid mixture, evaporates at a predetermined rate at each temperature during the heat exchange process. This eliminates the need for an evaporator for evaporating the liquid LPG and an external heat source therefor, and also enables the mixed water to evaporate at a relatively low temperature. It is possible to obtain steam having a sufficient pressure to be introduced into a combustor of a gas turbine in a heat exchange process in the inside.

[0014]

Therefore, according to the present invention, the following effects can be obtained. 1. Since the liquid LPG can be evaporated by the LPG mixed water evaporator operated by the exhaust heat of the gas turbine, there is no need to separately provide an external LPG evaporator and no need to consume an extra amount of heat. . 2. Since the temperature level in the feed water heater 26 in the conventional gas turbine device is relatively low (for example, 200 ° C. or less), it was impossible to generate high-pressure steam. However, the LPG mixed water evaporator 36 of the present invention was not used. Inside, it is possible to generate high-pressure steam in a mixed state with LPG gas.
This water vapor enters the combustor with the LPG gas, and after further raising the temperature, can work in the turbine. 3. Since latent heat exchange is performed also in the evaporator 36, exhaust heat of the gas turbine can be recovered to 100 ° C. or less. Therefore, the cycle efficiency of the gas turbine is higher than the conventional one. 4. Since the amount of water vapor in the mixed gas 11 sent from the steam separator 32 to the combustor 22 is equal to or greater than that of the LPG gas, there is an effect of considerably reducing the generation of NOx in the combustor 22.

In summary, the gas turbine apparatus equipped with the LPG mixed water evaporator of the present invention can eliminate a separate evaporator for evaporating the liquid LPG and an external heat source therefor, and at the same time, Steam with sufficient pressure to be introduced into the combustor of the gas turbine can be obtained, and further, the various beneficial effects described above can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a preferred embodiment of a gas turbine device according to the present invention.

FIG. 2 is a detailed view of a gas line that supplies a mixed gas to a combustor of a gas turbine.

FIG. 3 is a detailed view of an upstream line of the LPG / water mixer.

FIG. 4 is an example of a heat exchange process in the LPG mixed water evaporator of the present invention.

FIG. 5 is an example of a heat exchange process in a conventional feed water heater.

FIG. 6 is an overall configuration diagram of a conventional gas turbine device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Atmospheric air 2 Electric power 3 Gas turbine exhaust 4 LPG heating steam 5 Injection steam to gas turbine 6 Liquid LPG 7 LPG gas 8 Utility steam 9 Water 10 Hot water 11 Mixed gas of LPG gas and steam 20 Compressor 21 Turbine 22 Combustor 23 Generator 24 LPG Evaporator 25 Waste Heat Boiler 26 Feed Water Heater 27 Feed Water Pump 28 Steam Flow Control Valve 29 Exhaust Chimney 30 LPG Pump 32 Gas Water Separator 34 LPG / Water Mixer 35 Fuel Gas Control Valve 36 LPG Mixed Water Evaporator 37 LPG flow control valve 38 Feedwater flow control valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02C 3/20 F02C 3/30 F02C 6/18 F02C 7/22

Claims (4)

(57) [Claims] 1. A gas turbine using LPG gas as fuel, an exhaust heat boiler using gas turbine exhaust as a heat source, and an LP for mixing liquid LPG and water to produce LPG mixed water
A G / water mixer, an evaporator for LPG mixed water that evaporates the LPG mixed water using exhaust gas from a gas turbine as a heat source, and a gas for separating a mixed gas of LPG gas and water vapor evaporated by the evaporator from hot water. A water separator, a gas line that supplies the mixed gas separated by the steam separator to the combustor of the gas turbine, and a hot water line that supplies hot water separated by the steam separator to the exhaust heat boiler. A gas turbine device comprising an evaporator for mixed LPG water, comprising: 2. The liquid LPG mixed water evaporator comprises a liquid LP
The gas turbine device provided with the evaporator for LPG mixed water according to claim 1, wherein heat exchange is performed by gas-liquid equilibrium between G and water. 3. The evaporator for LPG mixed water heats a mixture of liquid LPG and water through a heat transfer wall by exhaust of a gas turbine to evaporate a part of the liquid LPG and water, and an outlet of the evaporator. The LPG gas, water vapor, and hot water in a predetermined ratio are used for the gas turbine apparatus provided with the LPG mixed water evaporator according to claim 1. 4. The liquid LPG upstream of the LPG / water mixer
The LPG of claim 1, further comprising: a device for measuring water; and a device for measuring water.
A gas turbine device equipped with a mixed water evaporator.