JP2021032191A - Hot water storage power generation system and method for operating hot water storage power generation system - Google Patents

Abstract

To provide a hot water storage power generation system which can absorb both variation in power generation output in short cycle and variation in power generation output in long cycle in a power generation system using renewable energy.SOLUTION: A hot water storage power generation system of the present invention includes: a steam generation source 10 for generating steam; a rated load operation steam turbine 20 driven using super-heated steam 12 generated by the steam generation source; and a hot water storage tank 40 for storing hot water 7 and saturated steam 6 using the steam 5 generated by the steam generation source. A high-speed load tracking steam turbine 50 is provided which is driven by mixed steam of the super-heated steam generated in the steam generation source and the saturated steam in the hot water storage tank, or mixed steam of the super-heated steam generated in the steam generation source and the hot water in the hot water storage tank.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water storage power generation system and a method of operating the hot water storage power generation system.

In recent years, renewable energy has been used by combining a power generation system that uses renewable energy such as solar power generation and wind power generation with a steam turbine power generation system that uses high-temperature and high-pressure steam to drive a steam turbine to generate power. A power generation system has been proposed in which a steam turbine power generation system absorbs fluctuations in power generation output due to the power generation system.

In other words, a power generation system that uses renewable energy, for example, in photovoltaic power generation, has a long cycle due to fluctuations in the short cycle power output in which the sun hides in the clouds and changes in the power output, and the difference in the power output between daytime and nighttime. There are fluctuations in power output. The steam turbine power generation system absorbs fluctuations in the power generation output of the power generation system that uses such renewable energy.

In order to absorb the fluctuation of the power generation output by the power generation system using renewable energy, it is necessary to increase or decrease the power generation output by the steam turbine power generation system according to the fluctuation of the power generation output by the power generation system using renewable energy. .. The increase / decrease in the power generation output by the steam turbine power generation system can be realized, for example, by increasing / decreasing the fuel supply amount.

However, there is a limit to improving the load change rate of the steam turbine power generation system.

First, a steam generation source such as a direct-fired boiler recovers the apparent heat of the exhaust gas obtained by burning fuel and air as steam via a heat transfer tube. Therefore, after increasing or decreasing the fuel supply amount, the amount of exhaust gas increases or decreases. , There is a time lag before the temperature of the heat transfer tube rises and falls and the amount of steam generated increases or decreases.

As a background technique in this technical field, there is Japanese Patent Application Laid-Open No. 2016-160884 (Patent Document 1). In Patent Document 1, an exhaust heat recovery boiler, a steam turbine driven by steam generated by the exhaust heat recovery boiler, and steam generated by the exhaust heat recovery boiler are stored, and the stored steam is supplied to the steam turbine. A waste heat recovery system having a steam accumulator and a drain trap for storing the condensed water generated by the steam accumulator and using the condensed water of the drain trap or the steam of the steam accumulator as a heat source is described (see summary). ).

Japanese Unexamined Patent Publication No. 2016-160848

Patent Document 1 describes an exhaust heat recovery system including a steam accumulator that supplies stored steam to a steam turbine and a drain trap that stores condensed water generated by the steam accumulator.

However, Patent Document 1 describes a hot water storage power generation system that can absorb both fluctuations in short-period power generation output and fluctuations in long-period power generation output in a power generation system using renewable energy. It has not been.

Therefore, the present invention presents a hot water storage power generation system and a hot water storage power generation system that can absorb both fluctuations in short-period power generation output and fluctuations in long-period power generation output in a power generation system using renewable energy. Provides a driving method.

That is, in the present invention, for example, in photovoltaic power generation, fluctuations in short-period power generation output in which the sun hides in clouds and changes in power generation output and fluctuations in long-period power generation output due to differences in power generation output between daytime and nighttime can be described. Provided are a method of operating a hot water storage power generation system and a hot water storage power generation system that can be absorbed by a steam turbine power generation system and have an improved load change rate.

In order to solve the above problems, the hot water storage power generation system of the present invention includes a steam generation source that generates steam, a steam turbine for rated load operation that is driven by using superheated steam generated by the steam generation source, and steam. A hot water storage power generation system having a hot water storage tank for storing hot water and saturated steam using steam generated at the source, and superheated steam and hot water storage generated at the steam source. It is characterized by having a high-speed load tracking dedicated steam turbine driven by using mixed steam with saturated steam of the tank or mixed steam of superheated steam generated at the steam source and hot water of the hot water storage tank. And.

Further, the hot water storage power generation system of the present invention is characterized by having a mixer that mixes saturated steam and superheated steam, and a mixer that mixes hot water and superheated steam.

Further, the operation method of the hot water storage power generation system of the present invention is a mixed steam of superheated steam generated by a steam source and saturated steam of a hot water storage tank, or superheated steam and heat generated by a steam source. It is characterized by producing mixed steam with hot water in a water storage tank and driving a dedicated steam turbine for high speed load tracking.

According to the present invention, a hot water storage power generation system and a hot water storage power generation system capable of absorbing both short-period fluctuations in power generation output and fluctuations in long-period power generation output in a power generation system using renewable energy. Driving method can be provided.

Then, for example, in photovoltaic power generation, the fluctuation of the short-period power generation output in which the sun is hidden in the clouds and the change in the power generation output and the fluctuation of the long-period power generation output due to the difference in the power generation output between the daytime and the nighttime are measured by the steam turbine power generation system. It is possible to provide a method of operating a hot water storage power generation system and a hot water storage power generation system, which can be absorbed by the above and has an improved load change rate.

Issues, configurations, and effects other than those described above will be clarified by the explanation of the examples below.

It is explanatory drawing explaining the hot water storage power generation system and its control apparatus which describe in Example 1. FIG. It is explanatory drawing explaining the operation method 1 of the hot water storage power generation system described in Example 1. FIG. It is explanatory drawing explaining the operation method 2 of the hot water storage power generation system described in Example 1. FIG. It is explanatory drawing explaining the operation method 3 of the hot water storage power generation system described in Example 1. FIG. It is explanatory drawing explaining the operation method 4 of the hot water storage power generation system described in Example 1. FIG. It is explanatory drawing explaining the hot water storage power generation system described in Example 2.

Hereinafter, examples of the present invention will be described with reference to the drawings. In addition, substantially the same or similar configurations are designated by the same reference numerals, and when the explanations are duplicated, the explanations may be omitted.

First, the hot water storage power generation system and its control device described in the first embodiment will be described.

FIG. 1 is an explanatory diagram illustrating the hot water storage power generation system and its control device according to the first embodiment.

The hot water storage power generation system described in the first embodiment is referred to as a boiler 10, a hot water storage tank 40, a condenser 30, and a steam turbine 20 for rated load operation (hereinafter, for convenience of explanation, the term "steam turbine 20"). ), A steam turbine 50 dedicated to high-speed load tracking (hereinafter, referred to as a "steam turbine 50" for convenience of explanation), and a water supply pump 31.

In the first embodiment, the steam turbine power generation system is a steam turbine 20 and a steam turbine 50 that use high-temperature and high-pressure steam to drive a steam turbine to generate electricity (the same applies to the following examples).

Further, in the first embodiment, the description of the power generation system using renewable energy such as solar power generation and wind power generation will be omitted, but the fluctuation of the short-period power generation output in the power generation system using renewable energy and the fluctuation of the power generation output In order to absorb fluctuations in the power generation output over a long period, the fluctuations are added to the power generation command 90 (the same applies to the following examples).

The boiler 10 is a steam generation source that generates steam, and has a heat transfer tube 11 inside. Fuel 1 such as coal and heavy oil and air 2 are supplied to the boiler 10. Fuel 1 and air 2 burn to generate high-temperature exhaust gas. Then, the sensible heat of the high-temperature exhaust gas is recovered as steam via the heat transfer tube 11. That is, the boiler 10 uses high-temperature exhaust gas to generate steam 5 (steam in a gas-liquid mixed state) or superheated steam 12 (steam in a gaseous state, steam in a superheated state or steam in a supercritical state) from the boiler supply water 4. Generate. The sensible heat of the high-temperature exhaust gas is recovered and discharged from the boiler 10 as the exhaust gas 3.

In Example 1, the boiler 10 is a direct-fired boiler that generates steam by using fuel 1 such as coal or heavy oil to generate high-temperature exhaust gas and exchanging heat with the high-temperature exhaust gas. It is an exhaust heat recovery boiler that generates steam by driving a gas turbine and exchanging heat with high-temperature exhaust gas discharged from the gas turbine with combustion gas generated using fuel such as gas or liquefied petroleum gas. You may.

The hot water storage tank 40 stores hot water 7 and steam (saturated steam 6), and the hot water storage tank 40 stores steam 5 (steam in the rear middle stage of the heat transfer tube 11) generated by the boiler 10. Is supplied.

Superheated steam 12 (steam on the outlet side of the heat transfer tube 11) generated by the boiler 10 is supplied to the steam turbine 20, and the superheated steam 12 is used to drive the steam turbine 20. A generator 21 is connected to the steam turbine 20. The steam turbine 20 drives the generator 21, and the generator 21 generates electricity.

The hot water storage power generation system according to the first embodiment is a mixer 42 that mixes saturated steam 6 generated by boiling hot water 7 in a hot water storage tank 40 under reduced pressure and superheated steam 12 generated in a boiler 10. , A mixer 43, which mixes the hot water 7 of the hot water storage tank 40 and the superheated steam 12 generated by the boiler 10.

The steam turbine 50 is supplied with steam (mixed steam) mixed (produced) by the mixer 42 or steam (mixed steam) mixed (produced) by the mixer 43, and either of the mixed steams is used. Drive. A generator 51 is connected to the steam turbine 50. The steam turbine 50 drives the generator 51, and the generator 51 generates electricity.

The condenser 30 condenses the steam whose temperature and pressure discharged from the steam turbine 20 has decreased, or the steam whose temperature and pressure discharged from the steam turbine 50 has decreased, into the boiler supply water 4.

The water supply pump 31 supplies the boiler water supply 4 of the condenser 30 to the inlet side of the heat transfer pipe 11.

The steam turbine 50 has a size (power generation output) of about 1/10 to 1/5 of that of the steam turbine 20, and the gap between the rotor blade and the casing is slightly larger than that of the steam turbine 20, and the load changes. A high rate is preferred.

The hot water storage power generation system described in Example 1 has the following piping and flow rate control valve.

It has a pipe connecting the rear middle stage of the heat transfer tube 11 and the hot water storage tank 40, and supplies steam 5 to the hot water storage tank 40. This pipe has a flow rate control valve 61.

It has a pipe connecting the outlet side of the heat transfer tube 11 and the mixer 42, and supplies the superheated steam 12 to the mixer 42. This pipe has a flow rate control valve 62.

It has a pipe connecting the hot water storage tank 40 and the mixer 42, and supplies the saturated steam 6 of the hot water storage tank 40 to the mixer 42. This pipe has a flow rate control valve 63.

It has a pipe connecting the hot water storage tank 40 and the front middle stage of the heat transfer tube 11, and supplies the hot water 7 of the hot water storage tank 40 to the front middle stage of the heat transfer tube 11. This pipe has a flow rate control valve 64. Further, this pipe enables the hot water 7 of the hot water storage tank 40 to be supplied to the heat transfer tube 11 even when the pressure of the hot water storage tank 40 is lower than the pressure of the heat transfer tube 11. Therefore, it has a water supply pump 41.

It has a pipe connecting the hot water storage tank 40 and the mixer 43, and supplies the hot water 7 of the hot water storage tank 40 to the mixer 43. This pipe has a flow rate control valve 65.

It has a pipe connecting the mixer 43 and the steam turbine 50, and supplies the steam generated by the mixer 43 or the steam generated by the mixer 42 to the steam turbine 50. This pipe has a flow rate control valve 66.

When the steam turbine 50 is stopped, the steam turbine 50 has a pipe for supplying auxiliary steam 8 for warming, and this pipe has a flow rate control valve 67.

It has a flow rate control valve 68 that adjusts the flow rate of the fuel 1 supplied to the boiler 10.

It has a pipe connecting the outlet side of the heat transfer tube 11 and the steam turbine 20, and supplies the superheated steam 12 to the steam turbine 20.

It has a pipe connecting the mixer 42 and the mixer 43, and supplies the steam or superheated steam 12 generated by the mixer 42 to the mixer 43.

The hot water storage power generation system described in Example 1 has the following thermometer, pressure gauge, and the like.

The hot water storage tank 40 includes a thermometer 71, a pressure gauge 72, and a hot water level meter 73, and includes the temperature of hot water 7 in the hot water storage tank 40, the pressure of saturated steam 6 in the hot water storage tank 40, and hot water. The hot water level of the hot water 7 of the storage tank 40 is measured.

The pipe connecting the mixer 42 and the mixer 43 has a thermometer 74 and a pressure gauge 75, and measures the temperature and pressure of the steam or superheated steam 12 generated by the mixer 42 flowing through the pipe.

The pipe connecting the mixer 43 and the steam turbine 50 has a thermometer 76 and a pressure gauge 77, and the temperature of steam generated by the mixer 43 flowing through the pipe or the temperature of steam generated by the mixer 42 and Measure the pressure.

The control device 70 described in the first embodiment includes a thermometer 71, a pressure gauge 72, a hot water level gauge 73, a thermometer 74, a pressure gauge 75, a thermometer 76, and a measured value of the pressure gauge 77 and a generator. A flow rate control valve 61, a flow rate control valve 62, a flow rate control valve 63, a flow rate control valve 64, a flow rate control valve 65, by inputting a power generation output generated by 21, a power generation output generated by a generator 51, and a power generation command 90, It controls the flow rate control valve 66, the flow rate control valve 68, and the water supply pump 41.

As described above, the hot water storage power generation system described in the first embodiment has a steam turbine 20 driven by the superheated steam 12 and a steam turbine driven by the steam generated by the mixer 42 or the steam generated by the mixer 43. Has 50 and.

The hot water storage power generation system described in Example 1 includes a mixer 42 that mixes saturated steam 6 and superheated steam 12 in the hot water storage tank 40, and hot water 7 and superheated steam 12 in the hot water storage tank 40. It has a mixer 43 and a mixer 43 for mixing the above.

That is, the hot water storage power generation system according to the first embodiment uses steam (steam 5 or superheated steam 12) generated by the steam generation source (boiler 10), and uses a steam turbine (steam turbine 20 and / or steam turbine 50). ) Is driven to generate electricity in a steam turbine power generation system, a hot water storage tank 40 for storing saturated steam 6 and hot water 7, a mixer 42 for mixing saturated steam 6 and superheated steam 12 in the hot water storage tank, and heat. A mixer 43, which mixes the hot water 7 of the water storage tank 40 and the superheated steam 12, is installed.

As a result, it is possible to deal with both fluctuations in short-period power generation output and fluctuations in long-period power generation output in a power generation system that uses renewable energy.

Then, the time delay of the boiler 10 can be eliminated, and the load change rate of the steam turbine power generation system can be improved.

Further, when the temperature of the supplied steam fluctuates, the steam turbine consumes its life due to thermal fatigue. In the first embodiment, the fluctuation range of the temperature of the steam supplied to the steam turbine 20 and the fluctuation range of the temperature of the steam supplied to the steam turbine 50 can be reduced, respectively, and each of the steam turbine 20 and the steam turbine 50 can be reduced. Can extend the life of the turbine.

In addition, the steam turbine power generation system has the minimum load required to continue operation. Once the fuel supply is stopped and the operation is stopped, it takes time to restart the operation. Therefore, it is necessary to continue the operation with the minimum load, but surplus power is generated. In the first embodiment, such surplus power can be effectively used.

According to the first embodiment, for example, hot water or steam is stored in the daytime when the power generation output of the photovoltaic power generation is large and the power generation command for the steam turbine power generation system is small, and the stored hot water or steam is used at night. It is possible to absorb fluctuations in power generation output over a long period of time. Then, the sun is hidden in the clouds, and it is possible to absorb fluctuations in the power generation output in a short period in which the power generation output of the photovoltaic power generation changes. That is, according to the first embodiment, it is possible to cope with fluctuations in the power generation output on a time scale in which the power generation output of the photovoltaic power generation changes from moment to moment.

Further, according to the first embodiment, even when the power generation output of the power generation system using renewable energy is significantly reduced, by using the steam turbine 50, the insufficient power generation output can be used as fuel for the boiler 10. It can be supplemented without increasing the supply.

Next, the operation method of the hot water storage power generation system described in the first embodiment will be described.

First, in the rated load operation (operation method 0), the flow rate control valve 68 is opened, and the flow rate control valve 61, the flow rate control valve 62, the flow rate control valve 63, the flow rate control valve 64, the flow rate control valve 65, the flow rate control valve 66, Then, the flow rate control valve 67 is closed, and the superheated steam 12 is supplied to the steam turbine 20.

In the method of operating the hot water storage power generation system according to the first embodiment, steam is generated by the boiler 10, the superheated steam 12 generated by the boiler 10 is used to drive the steam turbine 20, and the steam turbine 20 is generated by the boiler 10. The steam 5 is used to store the hot water 7 and the saturated steam 6 in the hot water storage tank 40. Then, the mixed steam of the superheated steam 12 generated in the boiler 10 and the saturated steam 6 of the hot water storage tank 40, or the mixing of the superheated steam 12 generated in the boiler 10 and the hot water 7 of the hot water storage tank 40. Produces steam.

Further, a mixed steam of the superheated steam 12 generated by the boiler 10 and the saturated steam 6 of the hot water storage tank 40, or a mixture of the superheated steam 12 generated by the boiler 10 and the hot water 7 of the hot water storage tank 40. Steam is used to drive the steam turbine 50.

Next, the operation method 1 of the hot water storage power generation system described in the first embodiment will be described.

FIG. 2 is an explanatory diagram illustrating an operation method 1 of the hot water storage power generation system described in the first embodiment.

In the operation of supplying steam 5 to the hot water storage tank 40 and storing the hot water 7 (operation method 1), the flow rate control valve 61 is opened, and the flow rate control valve 62, the flow rate control valve 63, the flow rate control valve 64, The flow rate control valve 65 and the flow rate control valve 66 are closed, and steam 5 is supplied to the hot water storage tank 40. As a result, the hot water 7 is stored in the hot water storage tank 40. The flow rate control valve 67 is opened to supply the steam turbine 50 with auxiliary steam 8 for warming.

The steam turbine 50 repeatedly starts and stops. Therefore, when the steam turbine 50 is stopped (when the flow rate control valve 67 is closed), the auxiliary steam 8 for warming is supplied to the steam turbine 50. As a result, the life consumption of the steam turbine 50 due to thermal fatigue is suppressed.

That is, the steam turbine 50 may start at high speed. When high-temperature steam is supplied to the steam turbine 50 whose temperature has dropped, the life is consumed due to thermal fatigue. Then, the auxiliary steam flow rate of the warming auxiliary steam 8 supplied when the steam turbine 50 is stopped is adjusted by the flow rate adjusting valve 67 according to the metal temperature of the steam turbine 50.

In the operation method 1, the boiler 10 is supplied with more fuel than the fuel supply amount required to satisfy the power generation command 90 smaller than the rated load during the time period when the power generation command 90 is smaller than the rated load, and the steam turbine. 20 is operated so as to be equal to the power generation command 90, which is smaller than the rated load. Then, the surplus steam 5 is extracted from the boiler 10 and stored in the hot water storage tank 40 as hot water 7 and saturated steam 6.

The operation method 1 is effective when the power generation command 90 is smaller than the minimum load of the steam turbine 20. By installing the hot water storage tank 10, the steam that drives the steam turbine 50 can be generated, that is, the steam turbine 50 can be installed. This makes it possible to reduce the minimum load of the steam turbine power plant and widen the load range in which it can be operated.

Further, in the operation method 1, when the reduction rate of the power generation command 90 is larger than the maximum load change rate of the steam turbine 20, the steam turbine 20 is operated so as to be equal to the power generation command 90. Then, the surplus steam 5 is extracted from the boiler 10 and stored in the hot water storage tank 40 as hot water 7 and saturated steam 6. As a result, the steam turbine power plant can reduce the load faster than the maximum load change rate of the steam turbine 20. For example, it is possible to absorb fluctuations in the power generation output when the wind suddenly becomes strong and the power generation output of the wind power generation suddenly increases.

Next, an operation method using the hot water 7 and the saturated steam 6 stored in the hot water storage tank 40 will be described.

The operation method using the hot water 7 and the saturated steam 6 stored in the hot water storage tank 40 is executed in the following cases.
(1) When the power generation command 90 is larger than the power generation output of the steam turbine 20.
(2) When the power generation command 90 is equal to or less than the rated load of the steam turbine 20, and the rate of increase of the power generation command 90 is larger than the maximum load change rate of the steam turbine 20.

In either case, the power generation output can be increased without increasing the fuel supply amount to the boiler 10. In particular, in the case of (2), for example, in the case of wind power generation where the wind suddenly stops and the power generation output suddenly decreases, or in the case of solar power generation where the sun suddenly hides in the clouds and the power generation output suddenly decreases, the power generation output Can be raised at high speed to compensate for the sudden decrease in power generation output.

Then, there are the following two operating methods using the hot water 7 and the saturated steam 6 stored in the hot water storage tank 40.

The operation method 2 (the first of the two) of the hot water storage power generation system described in the first embodiment will be described.

FIG. 3 is an explanatory diagram illustrating an operation method 2 of the hot water storage power generation system described in the first embodiment.

In the operation method 2, for example, in the cases of (1) and (2), the saturated steam 6 and the superheated steam 12 of the hot water storage tank 40 are mixed, and the mixed steam is used to drive the steam turbine 50. Is.

In the operation method 2, the flow rate control valve 62, the flow rate control valve 63, and the flow rate control valve 66 are opened, and the flow rate control valve 61, the flow rate control valve 64, the flow rate control valve 65, and the flow rate control valve 67 are closed.

Then, the saturated steam 6 and the superheated steam 12 of the hot water storage tank 40 are mixed by the mixer 42, and the steam generated by the mixer 42 is used to drive the steam turbine 50.

As a result, the steam turbine 50 can make up for the shortage of the power generation output of the steam turbine 20.

In the operation method 2, the flow rate control valve 63 and the flow rate control valve 62 are adjusted under the steam conditions (steam flow rate) that can be supplied to the steam turbine 50 so that the steam turbine 50 can obtain the required power generation output. Adjust to.

In the operation method 2, the superheated steam 12 supplied to the steam turbine 20 is reduced (12 minutes of the superheated steam supplied to the mixer 42 is reduced). However, since the steam generated by the mixer 42 is used to drive the steam turbine 50, the power output of the steam turbine power plant increases.

The operation method 3 (the second of the two) of the hot water storage power generation system described in the first embodiment will be described.

FIG. 4 is an explanatory diagram illustrating an operation method 3 of the hot water storage power generation system described in the first embodiment.

In the operation method 3, for example, in the cases of (1) and (2), the hot water 7 of the hot water storage tank 40 and the superheated steam 12 are mixed, and the mixed steam is used to drive the steam turbine 50. Is.

In the operation method 3, the flow rate control valve 62, the flow rate control valve 65, and the flow rate control valve 66 are opened, and the flow rate control valve 61, the flow rate control valve 63, the flow rate control valve 64, and the flow rate control valve 67 are closed.

Then, the hot water 7 of the hot water storage tank 40 and the superheated steam 12 are mixed by the mixer 43, and the steam generated by the mixer 43 is used to drive the steam turbine 50.

As a result, the steam turbine 50 can make up for the shortage of the power generation output of the steam turbine 20.

In the operation method 3, the flow rate control valve 65 and the flow rate control valve 62 are adjusted under the steam conditions (steam flow rate) that can be supplied to the steam turbine 50 so that the steam turbine 50 can obtain the required power generation output. Adjust to.

Next, the operation method 4 of the hot water storage power generation system described in the first embodiment will be described.

FIG. 5 is an explanatory diagram illustrating an operation method 4 of the hot water storage power generation system described in the first embodiment.

The operation method 4 is an operation of supplying the hot water 7 of the hot water storage tank 40 to the front middle stage of the heat transfer tube 11.

In the operation method 4, the flow rate control valve 64 and the flow rate control valve 67 are opened, and the flow rate control valve 61, the flow rate control valve 62, the flow rate control valve 63, the flow rate control valve 65, and the flow rate control valve 66 are closed.

Then, the hot water 7 of the hot water storage tank 40 is supplied to the front middle stage of the heat transfer tube 11.

The temperature of the hot water 7 in the hot water storage tank 40 and the pressure of the saturated steam 6 in the hot water storage tank 40 decrease, and the hot water 7 in the hot water storage tank 40 and the saturated steam 6 in the hot water storage tank 40 are used. When the steam turbine 50 cannot be driven, particularly when the power generation command 90 is in the time zone of the rated load (including the vicinity of the rated load) of the steam turbine 20, the hot water 7 of the hot water storage tank 40 is transferred to the heat transfer tube. It is supplied to the front middle stage of No. 11 and the steam turbine 20 is operated so as to be equal to the power generation command 90.

As a result, the superheated steam 12 generated by the boiler 12 increases according to the supply amount of the hot water 7 supplied to the heat transfer tube 11, so that the fuel supply amount to the boiler 10 can be reduced.

When the hot water 7 is supplied from the hot water storage tank 40 to the heat transfer tube 11, the flow rate control valve 64 adjusts the supply amount of the hot water 7 supplied to the heat transfer tube 11.

Further, in the operation method 4, the water supply pump 41 is driven particularly when the pressure of the hot water storage tank 40 is lower than the pressure of the heat transfer tube 11.

As described above, the hot water storage power generation system described in the first embodiment is the heat of the hot water storage tank 40 measured by the thermometer 71, the pressure gauge 72, and the hot water level meter 73 installed in the hot water storage tank 40. Based on the temperature of the water 7, the pressure of the saturated steam 6 of the hot water storage tank 40, and the hot water level of the hot water 7 of the hot water storage tank 40, the operation method 1, the operation method 2, the operation method 3, and the operation method 4 Is selected as appropriate.

The operation method 2 is executed when the pressure of the hot water storage tank 40 can obtain the saturated steam 6. That is, the hot water 7 in the hot water storage tank 40 is boiled under reduced pressure to generate saturated steam 6, and the saturated steam 6 is used to drive the steam turbine 50. Then, in the case of the operation method 2, the temperature and pressure of the hot water storage tank 40 and the temperature of the superheated steam 12 are used so that the steam obtained by mixing is steam having a temperature and pressure that can be supplied to the steam turbine 50. Based on the pressure and the pressure, the control device 70 calculates the optimum mixing ratio and adjusts the flow control valve 62 and the flow control valve 63.

The operation method 3 is executed when the pressure of the hot water storage tank 40 cannot obtain the saturated steam 6. That is, the hot water 7 of the hot water storage tank 40 is used to drive the steam turbine 50. Then, in the case of the operation method 3, the temperature and pressure of the hot water storage tank 40 and the temperature of the superheated steam 12 are used so that the steam obtained by mixing is steam having a temperature and pressure that can be supplied to the steam turbine 50. Based on the pressure and the pressure, the control device 70 calculates the optimum mixing ratio and adjusts the flow control valve 62 and the flow control valve 65.

The operation method 4 is when the temperature of the hot water storage tank 40 drops and the steam for driving the steam turbine 50 cannot be obtained even if the hot water 7 of the hot water storage tank 40 is mixed with the superheated steam 12. Execute. That is, the hot water 7 of the hot water storage tank 40 is supplied to the boiler 10.

As described above, according to the first embodiment, in a power generation system using renewable energy by installing the steam turbine 20 and the steam turbine 50, and by installing the mixer 42 and the mixer 43. Both short-period fluctuations in power generation output and long-period fluctuations in power generation output can be absorbed.

Then, for example, in photovoltaic power generation, the fluctuation of the short-period power generation output in which the sun is hidden in the clouds and the change in the power generation output and the fluctuation of the long-period power generation output due to the difference in the power generation output between daytime and nighttime are measured by the steam turbine power generation system. It is possible to provide a hot water storage power generation system that can be absorbed by the vehicle and has an improved load change rate.

Next, the hot water storage power generation system described in Example 2 will be described.

FIG. 6 is an explanatory diagram illustrating the hot water storage power generation system described in the second embodiment.

In the hot water storage power generation system described in the second embodiment, the hot water storage power generation system described in the first embodiment uses a boiler 10 that burns fuel 1 and air 2 to generate high temperature exhaust gas. , Exhaust heat recovery boiler 80 is used.

The exhaust heat recovery boiler 80 is a combustion gas generated by using fuel such as natural gas or liquefied petroleum gas, drives a gas turbine, and exchanges heat with combustion exhaust gas 9 (high temperature exhaust gas) discharged from the gas turbine. By doing so, steam is generated.

The combustion exhaust gas 9 is supplied to the exhaust heat recovery boiler 80, and the sensible heat of the combustion exhaust gas 9 is recovered as steam via a heat transfer tube.

That is, the boiler water supply 4 is supplied to the economizer 82 of the exhaust heat recovery boiler 80, and the boiler water supply 4 heated by the economizer 82 is supplied to the steam drum 81. An evaporator 83 of the exhaust heat recovery boiler 80 is connected to the lower part of the steam drum 81, and steam 5 is generated by the steam drum 81.

The steam 5 generated by the steam drum 81 is supplied to the superheater 84 of the exhaust heat recovery boiler 80, and the superheated steam 12 is generated. The superheated steam 12 is supplied to the steam turbine 20. Further, the steam 5 generated by the steam drum 81 is supplied to the hot water storage tank 40.

The hot water storage power generation system described in Example 2 has the following piping and flow rate control valve.

It has a pipe connecting the steam drum 81 and the hot water storage tank 40, and supplies steam 5 to the hot water storage tank 40. This pipe has a flow rate control valve 61.

It has a pipe connecting the superheater 84 and the mixer 42, and supplies the superheated steam 12 to the mixer 42. This pipe has a flow rate control valve 62.

It has a pipe connecting the hot water storage tank 40 and the mixer 42, and supplies the saturated steam 6 of the hot water storage tank 40 to the mixer 42. This pipe has a flow rate control valve 63.

It has a pipe connecting the hot water storage tank 40 and the economizer 82, and supplies the hot water 7 of the hot water storage tank 40 to the economizer 82. This pipe has a flow rate control valve 64. Further, this pipe can supply the hot water 7 of the hot water storage tank 40 to the coal saving device 82 even when the pressure of the hot water storage tank 40 is lower than the pressure of the coal saving device 82. It has a water supply pump 41.

It has a pipe connecting the hot water storage tank 40 and the mixer 43, and supplies the hot water 7 of the hot water storage tank 40 to the mixer 43. This pipe has a flow rate control valve 65.

It has a pipe connecting the mixer 43 and the steam turbine 50, and supplies the steam generated by the mixer 43 or the steam generated by the mixer 42 to the steam turbine 50. This pipe has a flow rate control valve 66.

When the steam turbine 50 is stopped, the steam turbine 50 has a pipe for supplying auxiliary steam 8 for warming, and this pipe has a flow rate control valve 67.

It has a pipe connecting the superheater 84 and the steam turbine 20, and supplies the superheated steam 12 to the steam turbine 20.

It has a pipe connecting the mixer 42 and the mixer 43, and supplies the steam or superheated steam 12 generated by the mixer 42 to the mixer 43.

As described above, according to the second embodiment, in the power generation system using renewable energy by installing the steam turbine 20 and the steam turbine 50, and by installing the mixer 42 and the mixer 43. It is possible to absorb both the fluctuation of the short-period power generation output and the fluctuation of the long-period power generation output, and it is possible to provide a hot water storage power generation system with an improved load change rate.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been specifically described in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with a part of the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace a part of another configuration with respect to a part of the configuration of each embodiment.

1 ... Fuel, 2 ... Air, 3 ... Exhaust gas, 4 ... Boiler water supply, 5 ... Steam, 6 ... Saturated steam, 7 ... Hot water, 8 ... Auxiliary steam, 9 ... Combustion exhaust gas, 10 ... Boiler, 11 ... Heat transfer tube, 12 ... Superheated steam, 20 ... Steam turbine for rated load operation, 21 ... Generator, 30 ... Condenser, 31 ... Water supply pump, 40 ... Hot water storage tank, 41 ... Water supply pump, 42 ... Saturated steam and superheated steam Mixer, 43 ... Mixer of hot water and superheated steam, 50 ... Steam turbine for high-speed load tracking, 51 ... Generator, 61 ... Flow control valve, 62 ... Flow control valve, 63 ... Flow control valve, 64 ... Flow control valve, 65 ... Flow control valve, 66 ... Flow control valve, 67 ... Flow control valve, 68 ... Flow control valve, 70 ... Control device, 71 ... Thermometer, 72 ... Pressure gauge, 73 ... Hot water level gauge, 80 ... exhaust heat recovery boiler, 81 ... steam drum, 82 ... coal saver, 83 ... evaporator, 84 ... superheater, 90 ... power generation command.

Claims (12)

Hot water and hot water using a steam source that produces steam, a steam turbine for rated load operation that is driven using superheated steam generated by the steam source, and steam generated by the steam source. A hot water storage power generation system having a hot water storage tank for storing saturated steam.
A mixed steam of the superheated steam generated by the steam source and the saturated steam of the hot water storage tank, or a mixed steam of the superheated steam generated by the steam source and the hot water of the hot water storage tank. A hot water storage power generation system characterized by having a dedicated steam turbine for high speed load tracking driven using. The hot water storage power generation system according to claim 1.
A hot water storage power generation system comprising a mixer for mixing the saturated steam and the superheated steam, and a mixer for mixing the hot water and the superheated steam. Steam is generated at the steam source, the superheated steam generated at the steam source is used to drive the steam turbine for rated load operation, and the steam generated at the steam source is used for hot water storage. It is a method of operating a hot water storage power generation system that stores hot water and saturated steam in a tank.
A mixed steam of superheated steam generated by the steam source and a saturated steam of the hot water storage tank, or a mixed steam of superheated steam generated by the steam source and hot water of the hot water storage tank. A method of operating a hydrothermal storage power generation system, which is characterized by producing. The method of operating the hot water storage power generation system according to claim 3.
A mixed steam of the superheated steam generated by the steam source and the saturated steam of the hot water storage tank, or a mixed steam of the superheated steam generated by the steam source and the hot water of the hot water storage tank. A method of operating a hydrothermal storage power generation system characterized by using a steam turbine dedicated to high-speed load tracking. The method of operating the hot water storage power generation system according to claim 3.
A method for operating a hot water storage power generation system, which comprises extracting steam generated by the steam generation source and storing it in the hot water storage tank at a time when the power generation command is smaller than the rated load. The method of operating the hot water storage power generation system according to claim 3.
When the reduction rate of the power generation command is larger than the maximum load change rate of the rated load operation steam turbine, the steam generated by the steam source is extracted and stored in the hot water storage tank. How to operate the water storage power generation system. The method of operating the hot water storage power generation system according to claim 4.
When the rate of increase of the power generation command is larger than the maximum load change rate of the rated load operation steam turbine, the saturated steam and the superheated steam are mixed to generate a mixed steam, and the mixed steam is used exclusively for following the high-speed load. A method of operating a hot water storage power generation system characterized by driving a steam turbine. The method of operating the hot water storage power generation system according to claim 4.
When the rate of increase of the power generation command is larger than the maximum load change rate of the rated load operation steam turbine, the hot water and the superheated steam are mixed to generate mixed steam, and the mixed steam is used exclusively for following the high-speed load. A method of operating a hot water storage power generation system characterized by driving a steam turbine. The method of operating the hot water storage power generation system according to claim 4.
When the power generation command is larger than the power generation output of the rated load operation steam turbine, the saturated steam and the superheated steam are mixed to generate mixed steam, and the mixed steam drives the high-speed load tracking dedicated steam turbine. A method of operating a hot water storage power generation system, which is characterized in that. The method of operating the hot water storage power generation system according to claim 4.
When the power generation command is larger than the power generation output of the rated load operation steam turbine, the hot water and the superheated steam are mixed to generate mixed steam, and the mixed steam drives the high-speed load tracking dedicated steam turbine. A method of operating a hot water storage power generation system. The method of operating the hot water storage power generation system according to claim 4.
A method of operating a hot water storage power generation system, characterized in that the hot water is supplied to the steam generation source at a time zone in which the power generation command is at or near the rated load. In the operation method of the hot water storage power generation system according to claim 4,
A method for operating a hot water storage power generation system, which comprises supplying auxiliary steam for warming to the steam turbine dedicated to high-speed load tracking.

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