JP3922876B2 - Gas turbine power generation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas turbine power generation facility that generates power by turning a turbine using a high-temperature and high-pressure gas.
[0002]
[Prior art]
Conventionally, as this type of gas turbine power generation equipment, for example, as shown in FIG. 6, a combustor 60 that generates high-temperature and high-pressure gas, a gas turbine 61, and heat of exhaust gas discharged from the gas turbine 61 are recovered. A waste heat recovery boiler 62 and a chimney 63 that discharges exhaust gas that has passed through the waste heat recovery boiler 62 into the atmosphere are provided. Part of the power generated in the gas turbine 61 is used to drive an air compressor 64 that supplies air to the combustor 60, and the remaining power is used to drive the generator 65 to generate power.
[0003]
An upstream path 66 leading from the exhaust side of the gas turbine 61 to the inlet side of the waste heat recovery boiler 62 and a downstream path 67 leading from the outlet side of the waste heat recovery boiler 62 to the chimney 63 are provided. Further, a bypass path 68 is provided which branches from the middle of the upstream path 66 and bypasses (detours) the waste heat recovery boiler 62 and joins in the middle of the downstream path 67. The bypass path 68 is provided with an adjustment valve 69 that adjusts the flow rate of the exhaust gas flowing through the bypass path 68. Further, an injection path 70 is provided for injecting steam obtained by the waste heat recovery boiler 62 into the combustor 60.
[0004]
According to this, the gas turbine 61 is rotated by the high-temperature and high-pressure gas generated in the combustor 60 and the steam injected from the injection path 70 into the combustor 60, and electric power is generated. The exhaust gas discharged from the gas turbine 61 passes through the upstream path 66, recovers waste heat by the waste heat recovery boiler 62, and then discharges from the chimney 63 through the downstream path 67 to the atmosphere.
[0005]
As described above, since steam is injected into the combustor 60 from the injection path 70, the exhaust gas contains a large amount of steam. When the outside air temperature is low in winter, the exhaust gas is rapidly cooled, Since the steam contained in the exhaust gas is condensed, white smoke may be generated in the chimney 63. This white smoke is usually harmless, but is not desirable for the landscape.
[0006]
Therefore, by dividing a part of the exhaust gas flowing in the upstream path 66 to the bypass path 68, the exhaust gas flowing into the downstream path 67 through this bypass path 68 and the downstream path 67 through the waste heat recovery boiler 62. The exhaust gas that has flowed into is mixed. At this time, the exhaust gas flowing into the downstream path 67 through the bypass path 68 has a higher temperature than the exhaust gas flowing into the downstream path 67 through the waste heat recovery boiler 62, so the temperature of the exhaust gas in the downstream path 67 Increases and the relative humidity of the exhaust gas decreases, thereby preventing the generation of white smoke.
[0007]
Further, as a conventional example different from the above, there is one in which a condenser 75 and a heater 76 are provided in the middle of a downstream path 67 as shown in FIG. A circulation path 77 for circulating cooling water (refrigerant) is formed between the condenser 75 and the heater 76, and a cooling water pump 78 is provided in the circulation path 77.
[0008]
According to this, since the exhaust gas discharged from the waste heat recovery boiler 62 is cooled by the condenser 75 and the steam contained in the exhaust gas is removed as water, the absolute humidity of the exhaust gas is reduced. Thereafter, the exhaust gas is heated by a heater 76 provided on the downstream side of the condenser 75, thereby preventing the generation of white smoke.
[0009]
[Problems to be solved by the invention]
However, in the gas turbine power generation facility 71 shown in FIG. 6, the amount of exhaust gas supplied from the upstream path 66 to the waste heat recovery boiler 62 decreases by the amount flowing from the upstream path 66 to the bypass path 68. . Accordingly, the amount of steam generated in the waste heat recovery boiler 62 is reduced, and accordingly, the amount of steam injected from the injection path 70 into the combustor 60 is also reduced. There is a problem that will decrease.
[0010]
Further, in the gas turbine power generation facility 79 shown in FIG. 7, in order to sufficiently remove the steam contained in the exhaust gas discharged from the waste heat recovery boiler 62 by the condenser 75, the cooling water (refrigerant) is circulated. A large amount of power is required to circulate along the path 77. As a result, the power consumption of the cooling water pump 78 increases, and as a result, there is a problem that the total power output of the power generation facility decreases.
[0011]
The present invention provides a gas turbine power generation facility capable of preventing generation of white smoke when exhaust gas from a turbine is discharged into the atmosphere, and further capable of preventing a decrease in power generation output. With the goal.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the first invention comprises a combustor for supplying high-temperature and high-pressure gas to a gas turbine, a waste heat recovery boiler for recovering heat of exhaust gas discharged from the gas turbine, and a waste heat recovery boiler. In a gas turbine power generation facility equipped with a discharge unit that discharges exhaust gas that has passed to the atmosphere,
A low-pressure turbine is provided between the gas turbine and the waste heat recovery boiler to lower the exhaust gas discharged from the gas turbine to less than atmospheric pressure,
Between the waste heat recovery boiler and the discharge part, a low-pressure compressor for pressurizing exhaust gas to atmospheric pressure is provided,
Between the waste heat recovery boiler and the low pressure compressor, a condenser for cooling and condensing steam contained in the exhaust gas is provided,
Connect the circulation path through which the refrigerant circulates to the condenser,
A pump for circulating the refrigerant is provided in the circulation path ,
An upstream main path that leads from the gas turbine to the waste heat recovery boiler through the low pressure turbine, an upstream bypass path that bypasses the low pressure turbine from the gas turbine to the waste heat recovery boiler, and an upstream main path that flows the exhaust gas Bypass the low-pressure compressor from the waste heat recovery boiler, the upstream main valve that switches to either the upstream bypass path, the downstream main path that leads from the waste heat recovery boiler through the low-pressure compressor to the discharge section, or A downstream bypass path that leads to the discharge section and a downstream switching valve that switches the flow of exhaust gas to either the downstream main path or the downstream bypass path are provided .
[0013]
According to this, the exhaust gas discharged from the gas turbine is lowered to a pressure lower than the atmospheric pressure by the low-pressure turbine, and then the waste heat is recovered in the waste heat recovery boiler, discharged from the waste heat recovery boiler, and cooled by the condenser. Then, it is pressurized to atmospheric pressure by a low-pressure compressor, and is discharged from the discharge portion to the atmosphere in this state.
[0014]
In this way, the exhaust gas is lowered to a pressure lower than the atmospheric pressure in the path between the low-pressure turbine and the low-pressure compressor, and further, the exhaust gas is cooled by the condenser and the temperature is lowered. Along with this, the amount of steam contained in the exhaust gas decreases, and the steam in the exhaust gas is condensed by the condenser to be removed as water. Therefore, generation of white smoke can be prevented by reducing the amount of steam in the exhaust gas that causes white smoke.
[0015]
In addition, when exhaust gas that has been reduced to a pressure lower than atmospheric pressure is pressurized to atmospheric pressure by a low-pressure compressor, the exhaust gas is adiabatically compressed, so that the temperature of the exhaust gas rises and the relative humidity of the exhaust gas decreases. In this state, exhaust gas is discharged from the discharge section. Thereby, generation | occurrence | production of white smoke can be prevented further.
[0016]
Furthermore, since all the exhaust gas discharged from the gas turbine passes through the low-pressure turbine and is supplied to the waste heat recovery boiler, the amount of exhaust gas supplied to the waste heat recovery boiler is reduced as in the prior art (see FIG. 6). Never do. Therefore, the amount of steam generated in the waste heat recovery boiler does not decrease, and even when the steam obtained in the waste heat recovery boiler is injected into the combustor, the amount of steam injected into the combustor decreases. There is nothing. Thereby, the fall of the power generation output by a gas turbine can be prevented.
[0018]
When the load (operating state) is unstable immediately after starting the power generation equipment, the upstream switching valve is switched to the upstream bypass path, and the downstream switching valve is switched to the downstream bypass path. As a result, the exhaust gas discharged from the gas turbine bypasses the low-pressure turbine and is supplied to the waste heat recovery boiler, and then passes through the condenser from the waste heat recovery boiler and bypasses the low-pressure compressor from the condenser ( Detours) and flows to the discharge section, where it is discharged into the atmosphere.
[0019]
Thereafter, when the load (operating state) is stabilized, the upstream switching valve is switched to the upstream main path, and the downstream switching valve is switched to the downstream main path. As a result, the exhaust gas discharged from the gas turbine is supplied to the waste heat recovery boiler through the low pressure turbine, and then flows from the waste heat recovery boiler through the condenser to the exhaust section through the low pressure compressor. , Discharged from the discharge section into the atmosphere. Thereby, generation | occurrence | production of white smoke can be prevented.
[0020]
The second invention is provided with a water supply path for supplying water to the waste heat recovery boiler,
A recovery path is formed in which the water liquefied from the steam by the condenser is recovered and sent to the water supply path.
[0021]
According to this, when the exhaust gas is cooled by the condenser, the steam contained in the exhaust gas becomes water, and this water is sent to the water supply route through the recovery route and supplied to the waste heat recovery boiler from the water supply route. Is done. Therefore, the water generated in the condenser can be effectively used as water supply to the waste heat recovery boiler without being discarded.
[0022]
The third invention is provided with a refrigerator that cools the refrigerant supplied to the condenser,
A part of the steam generated in the waste heat recovery boiler is used as a heating source for vaporizing the refrigerant.
[0023]
According to this, when the refrigerant is supplied to the condenser, the exhaust gas discharged from the waste heat recovery boiler is cooled by the condenser, and the steam contained in the exhaust gas becomes water. In addition, the said refrigerant | coolant is heated and vaporized by a part of vapor | steam which generate | occur | produced with the waste-heat recovery boiler, and is radiated | emitted and liquefied after that with a heat radiator.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, reference numeral 1 denotes a gas turbine power generation facility, which generates a high-temperature and high-pressure gas and supplies it to the gas turbine 2, and waste heat that recovers the heat of the exhaust gas discharged from the gas turbine 2. A recovery boiler 4 and a chimney 5 (an example of a discharge unit) that discharges exhaust gas that has passed through the waste heat recovery boiler 4 into the atmosphere are provided. Part of the power generated in the gas turbine 2 is used to drive the air compressor 6 that supplies air to the combustor 3, and the generator 7 is driven by the remaining power to generate power. Has been.
[0025]
A low-pressure turbine 8 is provided between the discharge side of the gas turbine 2 and the inlet side of the waste heat recovery boiler 4 to expand and reduce the exhaust gas discharged from the gas turbine 2 to below atmospheric pressure. Further, between the outlet side of the waste heat recovery boiler 4 and the chimney 5, a condenser 10 for cooling and condensing steam contained in the exhaust gas and a low-pressure compressor 11 for pressurizing the exhaust gas to atmospheric pressure are provided. It has been. The low-pressure compressor 11 is driven by the electric motor 27 and is disposed on the downstream side of the condenser 10.
[0026]
The waste heat recovery boiler 4 includes a superheater 12 that heats saturated steam to form superheated steam, an evaporator 13, and a economizer 14 that preheats feed water. Further, an injection path 15 for injecting superheated steam obtained by the superheater 12 into the combustor 3 is provided.
[0027]
Further, in the gas turbine power generation facility 1, the upstream main path 17 that leads from the gas turbine 2 through the low-pressure turbine 8 to the inlet side of the waste heat recovery boiler 4 and the low-pressure turbine 8 from the gas turbine 2 are bypassed (bypassed). Then, the upstream bypass path 18 leading to the inlet side of the waste heat recovery boiler 4, the downstream main path 19 leading from the condenser 10 to the chimney 5 through the low pressure compressor 11, and the low pressure compressor 11 from the condenser 10 A downstream bypass path 20 that bypasses and leads to the chimney 5 is provided. The upstream main path 17, the upstream bypass path 18, the downstream main path 19, and the downstream bypass path 20 are respectively openable and closable with one upstream switching valve 22 and the other upstream switching valve 23. A downstream switching valve 24 and the other downstream switching valve 25 are provided.
[0028]
The condenser 10 is connected to a circulation path 28 for supplying and recovering cooling water (an example of a refrigerant) to the condenser 10. The circulation path 28 is provided with a pump 29 that circulates the cooling water, a flow rate control valve 30 that adjusts the flow rate of the cooling water (refrigerant), and a radiator 31 that dissipates heat and lowers the temperature of the cooling water. Yes.
[0029]
Further, the gas turbine power generation facility 1 is provided with a water supply path 33 for supplying water to the economizer 14 of the waste heat recovery boiler 4. The water supply path 33 is provided with a water treatment device 34 and a water supply pump 35. The water supplied from the water supply path 33 to the economizer 14 is preheated by the economizer 14, becomes steam in the evaporator 13, then becomes superheated steam in the superheater 12, and is discharged from the injection path 15. It is injected into the combustor 3.
[0030]
A recovery path 36 is formed between the condenser 10 and the water supply path 33 to recover water liquefied from the vapor in the exhaust gas by the condenser 10 and send it to the water supply path 33.
The operation in the above configuration will be described.
[0031]
If the load (operating state) is still unstable immediately after starting the power generation facility 1, one upstream switching valve 22 is closed, the other upstream switching valve 23 is opened, and one downstream switching valve 24 is closed. Then, the other downstream side switching valve 25 is opened. Accordingly, the upstream bypass path 18 and the downstream bypass path 20 are opened, and the upstream main path 17 and the downstream main path 19 are blocked. The exhaust gas discharged from the gas turbine 2 flows through the upstream bypass path 18, bypasses the low-pressure turbine 8, and is supplied to the waste heat recovery boiler 4, and then passes through the condenser 10 from the waste heat recovery boiler 4. It flows through the downstream bypass path 20, bypasses the low-pressure compressor 11, and is discharged from the chimney 5 into the atmosphere.
[0032]
Thereafter, when the load (operating state) is stabilized, one upstream switching valve 22 is opened, the other upstream switching valve 23 is closed, one downstream switching valve 24 is opened, and the other downstream switching valve 25 is opened. close. Thus, the upstream bypass path 18 and the downstream bypass path 20 are blocked, and the upstream main path 17 and the downstream main path 19 are opened. The exhaust gas discharged from the gas turbine 2 flows through the upstream main path 17, is supplied to the waste heat recovery boiler 4 through the low-pressure turbine 8, and then flows from the waste heat recovery boiler 4 through the condenser 10 to the downstream main path. 19, passes through the low-pressure compressor 11, and is discharged from the chimney 5 to the atmosphere.
[0033]
At this time, the exhaust gas is expanded by the low-pressure turbine 8 and lowered to a pressure lower than the atmospheric pressure. After the waste heat is recovered in the waste heat recovery boiler 4, the exhaust gas is cooled by the condenser 10 and the temperature is decreased. The compressor 11 is pressurized to atmospheric pressure. Thus, the exhaust gas is lowered to a pressure lower than the atmospheric pressure in the path between the low-pressure turbine 8 and the low-pressure compressor 11, and further cooled by the condenser 10 to lower the temperature. As the saturated vapor pressure decreases, the amount of vapor contained in the exhaust gas also decreases, and the vapor in the exhaust gas is condensed by the condenser 10 to be removed as water. Therefore, generation of white smoke can be prevented by reducing the amount of steam in the exhaust gas that causes white smoke.
[0034]
Further, when the exhaust gas lowered to a pressure lower than atmospheric pressure is pressurized to atmospheric pressure by the low-pressure compressor 11, the exhaust gas is adiabatically compressed, so that the temperature of the exhaust gas rises and the relative humidity of the exhaust gas decreases, In this state, exhaust gas is discharged from the chimney 5. Thereby, generation | occurrence | production of white smoke can be prevented further.
[0035]
Further, since all the exhaust gas discharged from the gas turbine 2 is supplied to the waste heat recovery boiler 4 through the low-pressure turbine 8, the exhaust gas supplied to the waste heat recovery boiler 62 as in the prior art (see FIG. 6). The amount of will never decrease. Therefore, the amount of steam generated in the waste heat recovery boiler 4 does not decrease, and the amount of steam injected from the waste heat recovery boiler 4 through the injection path 15 into the combustor 3 does not decrease. Thereby, the fall of the power generation output by the gas turbine 2 can be prevented.
[0036]
Further, as described above, since the vapor in the exhaust gas is removed by the condenser 10, the amount of exhaust gas that passes through the low-pressure compressor 11 is smaller than the amount of exhaust gas that passes through the low-pressure turbine 8. For this reason, the difference between the power recovered by the low-pressure turbine 8 and the power required to operate the low-pressure compressor 11 is such that the amount of exhaust gas passing through the low-pressure compressor 11 is the same as the amount of exhaust gas passing through the low-pressure turbine 8. Compared with the case where it is, since the required power required to operate the low-pressure compressor 11 is reduced, it is increased accordingly. Thereby, a power generation output can be increased.
[0037]
Further, the water generated in the condenser 10 as described above (the vapor in the exhaust gas is liquefied) is sent to the water supply path 33 through the recovery path 36 and supplied to the waste heat recovery boiler 4 from the water supply path 33. Is done. Thereby, the water generated in the condenser 10 can be effectively used as water supply to the waste heat recovery boiler 4 without being discarded.
[0038]
The graph shown in FIG. 2 represents the relationship between the pressure ratio of the low-pressure turbine 8 and the increase rate of the power generation output and the relationship between the pressure ratio of the low-pressure turbine 8 and the exhaust gas temperature in the power generation facility 1 of the first embodiment. It is a thing. Here, the pressure ratio is defined by (inlet side pressure of the low pressure turbine 8 / outlet side pressure of the low pressure turbine 8). Further, the increase rate of the power generation output is a value based on the power generation output of the conventional power generation equipment in which the white smoke prevention bypass path 68 (see FIG. 6) and the condenser 75 (see FIG. 7) are not provided. It is. Further, the exhaust gas temperature is the temperature of the exhaust gas at the exit of the chimney 5.
[0039]
According to this, when the pressure ratio is 1.8, for example, since the exhaust gas temperature exceeds the white smoke generation limit temperature T, the generation of white smoke is prevented. At this time, the increase rate of the power generation output of the power generation facility 1 according to the first embodiment is 105%, and the decrease in the power generation output is prevented as compared with the conventional case (without the bypass path 68 and the condenser 75). Has been. At this time, for example, when the pressure on the inlet side of the low-pressure turbine 8 is 1.5 atm, the pressure on the outlet side of the low-pressure turbine 8 becomes 0.83 atm.
[0040]
Further, the table shown in FIG. 3 is a comparison between the power generation facility 1 of the first embodiment and the conventional power generation facilities A, B, and C. In addition, in the table | surface, each numerical value regarding the power generation equipment 1 of 1st Embodiment is a thing in case the said pressure ratio is 1.8. Further, the conventional power generation facility B corresponds to the one shown in FIG. 6, and the conventional power generation facility C corresponds to the one shown in FIG. Furthermore, the conventional power generation equipment A corresponds to the one not provided with the white smoke prevention bypass path 68 (see FIG. 6) or the condenser 75 (see FIG. 7). The generated steam amount indicates the amount of steam generated from the waste heat recovery boiler 4, and the water consumption amount indicates the amount of water supplied to the waste heat recovery boiler 4.
[0041]
According to this, compared with the conventional power generation facilities A, B, and C, the power generation facility 1 of the first embodiment has a higher power generation output and excellent overall thermal efficiency. Further, in the power generation facility 1 of the first embodiment, when all the steam generated in the waste heat recovery boiler 4 is injected into the combustor 3 from the injection path 15, this steam is combined with the exhaust gas into the gas turbine 2 → low pressure turbine. 8 → After passing through the waste heat recovery boiler 4, it is liquefied in the condenser 10 to become water, and is recovered from the recovery path 36 to the water supply path 33. The water recovered in this way is supplied to the waste heat recovery boiler 4 through the water supply path 33, becomes steam in the waste heat recovery boiler 4, and is again injected into the combustor 3 from the injection path 15. Thus, since the water supplied to the waste heat recovery boiler 4 from the water supply path 33 circulates between the condenser 10 and the combustor 3, the water consumption becomes zero.
[0042]
In contrast, the conventional power generation facilities A and B (see FIG. 6) are not provided with a condenser for recovering the steam in the exhaust gas discharged from the waste heat recovery boiler 62 as water. The water supplied to the waste heat recovery boiler 4 is consumed by the amount of steam generated from the boiler 62. Note that the amount of steam generated by the conventional power generation equipment B is smaller than the others, as shown in FIG. 6, the amount of exhaust gas supplied to the waste heat recovery boiler 62 decreases by the amount flowing to the bypass path 68. Therefore, the amount of steam generated in the waste heat recovery boiler 62 is also reduced.
[0043]
In the first embodiment, cooling water is used as an example of the refrigerant circulating in the circulation path 28, but chlorofluorocarbon, alcohol, or the like may be used.
Next, a second embodiment of the present invention will be described with reference to FIG.
[0044]
Freon, alcohol, or the like is injected as a refrigerant into the circulation path 28, and a refrigerating machine 45 that cools the refrigerant supplied to the condenser 10 is provided in the circulation path 28. The freezer 45 is provided with the radiator 31. Further, an input path 46 leading from the evaporator 13 of the waste heat recovery boiler 4 to the refrigerator 45 and a discharge path 47 leading from the refrigerator 45 to the water supply path 33 are provided.
[0045]
According to this, when the refrigerant circulates through the circulation path 28 by the pump 29 and is supplied to the condenser 10, the exhaust gas discharged from the waste heat recovery boiler 4 is cooled by the condenser 10, and the steam contained in the exhaust gas is reduced. Become water.
[0046]
At this time, a part of the steam generated in the evaporator 13 of the waste heat recovery boiler 4 is input to the refrigerator 45 from the input path 46, and the refrigerant in the circulation path 28 is heated by using the input steam as a heating source. Then, the heat is dissipated and liquefied by the radiator 31. The steam input from the charging path 46 to the freezer 45 is then converted into water, discharged from the freezer 45, and supplied to the water supply path 33 via the discharge path 47. In this way, a part of the steam generated in the waste heat recovery boiler 4 is used as the heating source, and after use, water liquefied from the steam is effectively used as water supply to the waste heat recovery boiler 4 without being discarded. Can be used.
[0047]
Next, a third embodiment of the present invention will be described with reference to FIG.
Cooling water is injected as a refrigerant into the circulation path 28, and a heat exchanger 48 is provided between the freezer 45 and the circulation path 28. The heat exchanger 48 is provided with a refrigerant circulation path 49 through which refrigerants such as chlorofluorocarbon and alcohol circulate. According to this, a part of the steam generated in the evaporator 13 of the waste heat recovery boiler 4 is input to the refrigerator 45 from the input path 46, and the refrigerant in the refrigerant circulation path 49 is heated by using the input steam as a heating source. Then, it is vaporized and then radiated and liquefied by the radiator 31 to cool the cooling water in the circulation path 28.
[0048]
【The invention's effect】
As described above, according to the first invention, the exhaust gas is lowered to a pressure lower than the atmospheric pressure in the path between the low-pressure turbine and the low-pressure compressor, and further, the temperature is lowered by being cooled by the condenser. The saturated vapor pressure of the exhaust gas is lowered, and accordingly, the amount of vapor contained in the exhaust gas is reduced, and the vapor in the exhaust gas is condensed by the condenser to be removed as water. Therefore, generation of white smoke can be prevented by reducing the amount of steam in the exhaust gas that causes white smoke.
[0049]
In addition, when exhaust gas that has been reduced to a pressure lower than atmospheric pressure is pressurized to atmospheric pressure by a low-pressure compressor, the exhaust gas is adiabatically compressed, so that the temperature of the exhaust gas rises and the relative humidity of the exhaust gas decreases. In this state, exhaust gas is discharged from the discharge section. Thereby, generation | occurrence | production of white smoke can be prevented further.
[0050]
Furthermore, since all the exhaust gas discharged from the gas turbine is supplied to the waste heat recovery boiler through the low pressure turbine, the amount of steam generated in the waste heat recovery boiler does not decrease, and the waste heat recovery boiler Even when the resulting steam is injected into the combustor, the amount of steam injected into the combustor does not decrease. Thereby, the fall of the power generation output by a gas turbine can be prevented.
[0051]
Further, as described above, since the vapor in the exhaust gas is removed by the condenser, the amount of exhaust gas that passes through the low-pressure compressor is smaller than the amount of exhaust gas that passes through the low-pressure turbine. For this reason, the difference between the power recovered by the low-pressure turbine and the power required to operate the low-pressure compressor is the same as when the amount of exhaust gas passing through the low-pressure compressor is the same as the amount of exhaust gas passing through the low-pressure turbine. In comparison, since the power required to operate the low-pressure compressor is reduced, the power is increased accordingly. Thereby, a power generation output can be increased.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a gas turbine power generation facility according to a first embodiment of the present invention.
FIG. 2 is a graph showing the relationship between the pressure ratio of the low-pressure turbine of the power generation equipment, the rate of increase in power generation output, and the exhaust gas temperature.
FIG. 3 is a chart comparing power generation equipment and conventional power generation equipment.
FIG. 4 is a diagram showing a configuration of a gas turbine power generation facility in a second embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a gas turbine power generation facility according to a third embodiment of the present invention.
FIG. 6 is a diagram showing a configuration of a conventional gas turbine power generation facility.
FIG. 7 is a diagram showing a configuration of a conventional gas turbine power generation facility.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas turbine power generation equipment 2 Gas turbine 3 Combustor 4 Waste heat recovery boiler 5 Chimney (discharge part)
8 Low-pressure turbine 10 Condenser 11 Low-pressure compressor 17 Upstream main path 18 Upstream bypass path 19 Downstream main path 20 Downstream bypass paths 22 and 23 Upstream switching valves 24 and 25 Downstream switching valves 28 Circulation path 29 Pump 33 Water supply path 36 Collection path 45 Freezer

Claims (3)

Combustor that supplies high-temperature and high-pressure gas to the gas turbine, a waste heat recovery boiler that recovers the heat of the exhaust gas discharged from the gas turbine, and a discharge unit that discharges the exhaust gas that has passed through the waste heat recovery boiler to the atmosphere Gas turbine power generation equipment
A low-pressure turbine is provided between the gas turbine and the waste heat recovery boiler to lower the exhaust gas discharged from the gas turbine to less than atmospheric pressure,
Between the waste heat recovery boiler and the discharge part, a low-pressure compressor for pressurizing exhaust gas to atmospheric pressure is provided,
Between the waste heat recovery boiler and the low pressure compressor, a condenser for cooling and condensing steam contained in the exhaust gas is provided,
Connect the circulation path through which the refrigerant circulates to the condenser,
A pump for circulating the refrigerant is provided in the circulation path ,
An upstream main path that leads from the gas turbine to the waste heat recovery boiler through the low pressure turbine, an upstream bypass path that bypasses the low pressure turbine from the gas turbine to the waste heat recovery boiler, and an upstream main path that flows the exhaust gas Bypass the low-pressure compressor from the waste heat recovery boiler, the upstream main valve that switches to either the upstream bypass path, the downstream main path that leads from the waste heat recovery boiler through the low-pressure compressor to the discharge section, or A gas turbine power generation facility, comprising: a downstream bypass path that leads to a discharge unit; and a downstream switching valve that switches an exhaust gas flow to either a downstream main path or a downstream bypass path . A water supply path is provided to supply water to the waste heat recovery boiler,
The gas turbine power generation facility according to claim 1, wherein a recovery path for recovering water liquefied from steam by a condenser and sending it to the water supply path is formed . A refrigerator that cools the refrigerant supplied to the condenser is provided,
The gas turbine power generation facility according to claim 1 or 2, wherein a part of the steam generated in the waste heat recovery boiler is used as a heating source for vaporizing the refrigerant .

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