JP6482021B2 - Power generation equipment - Google Patents

Description

  The present invention relates to a power generation facility in which a renewable energy power generation facility using renewable energy is used in combination.

  Renewable energy power generation facilities using renewable energy that does not use fossil fuels are being introduced. Since the output of the renewable energy power generation facility varies greatly depending on the natural environment, it is necessary to simultaneously use the thermal power generation facility and follow the output of the thermal power generation facility in order to meet the power demand. When the output of the renewable energy power generation facility changes (decreases) due to changes in the natural environment, it is necessary to change (increase) the output of the thermal power generation facility in a short time in order to cover the power demand.

  From such a situation, a steam power plant that can quickly respond to a rapid load change in the system has been proposed (Patent Document 1). The technique disclosed in Patent Document 1 stores steam generated in a boiler in an accumulator, and normally operates an emergency steam turbine with no load or low load by steam from the accumulator, so that power generation is urgently required. In some cases, the steam is transferred from the accumulator to full load operation.

  By applying the technique of Patent Document 1, the output of the system can be increased in a short time, and even when the output of the renewable energy power generation facility changes (decreases), the power demand can be followed.

  However, in order to operate the system (thermal power generation facility) at a low output, it is necessary to generate steam in a boiler using fuel such as natural gas and drive a low-pressure steam turbine. For this reason, fuel for generating steam is required, and there is a problem in that the efficiency (fuel consumption) of the thermal power generation facility is lowered, and environmental conditions may not be protected.

  Among facilities that use a renewable energy power generation facility and a thermal power generation facility at the same time, there is also a facility that covers both the renewable energy power generation facility and the thermal power generation facility at the same time to cover the power demand. In such a case, when the output of the renewable energy power generation facility changes (decreases), it is necessary to quickly respond to the output of the thermal power generation facility during operation.

  However, it is necessary to finely control the supply of fuel such as pulverized coal in order to make the output of the thermal power generation facility in operation finely follow the change in the output of the renewable energy power generation facility. However, in order to finely control the supply of fuel such as pulverized coal, there is a problem that the fuel supply means becomes large, and it has been difficult to realize it.

JP-A-8-232608

  The present invention has been made in view of the above situation, and in a power generation facility that uses a renewable energy power generation facility and a thermal power generation facility at the same time, the output of the thermal power generation facility during operation with respect to a change in the output of the renewable energy power generation facility An object of the present invention is to provide a power generation facility capable of closely following the power generation.

In order to achieve the above object, a power generation facility according to a first aspect of the present invention includes a combustion means for supplying fuel, a power generation means for generating power using energy obtained by the combustion means, and power generated by the power generation means. An electric power system to which electric power is sent, a renewable energy power generation facility connected to the electric power system and covering a required load together with electric power from the electric power generation means, an ammonia input means for introducing ammonia into the combustion means, and the renewable According to the fluctuation of the output of the energy power generation facility, when the power generation output for the required load is insufficient, the ammonia is input to increase the output of the power generation unit by supplying the ammonia and cover the required load. And an ammonia adjusting means for controlling the introduction of the ammonia.

  In the present invention according to claim 1, when the output of the renewable energy power generation facility changes, the ammonia adjusting means controls the input of ammonia from the ammonia charging means to the combustion means, and the output of the renewable energy power generation facility is controlled. The output of the power generation means is made to follow the change. As a result, the output of the operating power generation means (thermal power generation equipment) can be made to closely follow changes in the output of the renewable energy power generation equipment without affecting the supply of main fuel input to the combustion means. it can.

  A power generation facility according to a second aspect of the present invention is the power generation facility according to the first aspect, wherein the power generation facility according to the first aspect includes a hydrogen generation unit that obtains hydrogen from the ammonia input from the ammonia input unit using a heat source in the system. And hydrogen supply means for supplying hydrogen generated by the hydrogen generation means to the combustion means.

  In the present invention according to claim 2, since hydrogen is obtained from ammonia using a heat source in the system by the hydrogen generation means and hydrogen is supplied to the combustion means by the hydrogen supply means, the combustion means is used without using external energy. Can reduce nitrogen oxides.

  According to a third aspect of the present invention, there is provided the power generation facility according to the first or second aspect of the present invention, wherein the combustion means is a boiler that generates steam by burning fuel in a furnace. The power generation means is a steam turbine that obtains power generation by expanding the steam generated in the boiler.

  In this invention which concerns on Claim 3, the output of the thermal power generation equipment which drives a steam turbine with the steam which generate | occur | produced in the boiler with respect to the change of the output of a renewable energy power generation equipment can be made to follow finely.

  According to a fourth aspect of the present invention, there is provided the power generation facility according to the first or second aspect, wherein the combustion means is a combustor that obtains combustion gas when fuel is introduced, and the power generation means. Is a gas turbine that expands the combustion gas obtained by the combustor to obtain power generation power.

  In the present invention according to claim 4, the output of the thermal power generation facility that generates power by driving the gas turbine with the combustion gas obtained by the combustor can be made to closely follow the change in the output of the renewable energy power generation facility. it can.

  A power generation facility according to a fifth aspect of the present invention is the power generation facility according to the third or fourth aspect, further comprising a denitration means for denitrating exhaust gas of the combustion means, wherein the ammonia charging means is the The ammonia is supplied to the denitration means, and is a means for charging the combustion means.

  In the present invention according to claim 5, ammonia used in the denitration means provided in the system can be introduced into the combustion means, and no separate facility for supplying ammonia is required.

  The power generation facility according to the present invention is a power generation facility that uses a renewable energy power generation facility and a thermal power generation facility at the same time, and can closely follow the output of the thermal power generation facility during operation with respect to changes in the output of the renewable energy power generation facility. It becomes possible.

1 is a schematic system diagram of a power generation facility according to an embodiment of the present invention. It is a schematic system diagram of the thermal power generation equipment provided with the steam turbine. It is a schematic system diagram of the thermal power generation equipment provided with the gas turbine. It is a schematic system diagram of the thermal power generation equipment provided with the gas turbine. It is a graph showing the time-dependent change of the request | requirement output of electric power.

  FIG. 1 is a schematic system for explaining the overall configuration of a power generation facility according to an embodiment of the present invention, FIG. 2 is a schematic system of a thermal power generation facility equipped with a steam turbine, and FIG. 3 is a thermal power system equipped with a gas turbine. FIG. 4 is a schematic system diagram of a power generation facility, FIG. 4 is a schematic system diagram of a thermal power generation facility according to another embodiment, and FIG. 5 is a graph illustrating a power supply distribution at a required output.

  As shown in FIG. 1, the power generation facility 1 is provided with a boiler 2 as combustion means using coal as fuel, and a steam turbine 3 using steam generated by the boiler 2 as a drive source. The generator 4 is driven by the steam turbine 3 to obtain electric power (power generation means). The electric power generated by the generator 4 is sent to the electric power system 9. Power is supplied from the power system 9 to an external load 10.

  In addition, the power generation facility 11 includes, for example, a combustor 12 as combustion means using coal gasification gas as a fuel, and a turbine facility 14 including a turbine 13 using the combustion gas generated by the combustor 12 as a drive source. Is provided. The power generator 15 is driven by the turbine 13 to obtain electric power (power generation means). The electric power generated by the generator 15 is sent to the electric power system 9.

  On the other hand, power from the renewable energy power generation facility 20 is supplied to the power system 9. As the renewable energy power generation facility 20, for example, a plurality of solar power generation means 21 and a plurality of wind power generation means 22 are applied. In addition, as a power generation means of the renewable energy power generation facility 20, a power generation facility that does not use fossil fuel, such as hydropower, geothermal heat, tidal current, and biomass fuel, is applied.

  The power generation facilities 1 and 11 and the renewable energy power generation facility 20 are operated in parallel. For example, the required output of power supplies the power from the renewable energy power generation facility 20 and the power of the power generation facilities 1 and 11 to the power system 9 to cover the power of the load 10 (required output). Since the output of the renewable energy power generation facility 20 varies greatly depending on the natural environment, it is necessary to respond to stable power demand (required output).

  For this reason, when the output of the renewable energy power generation facility 20 decreases, ammonia is supplied to the boiler 2 and the combustor 12 (ammonia input means) in order to cover the required output of the electric power system 9, the steam turbine 3, and the turbine 13. (The output of the power generation means) is increased to follow the decrease in the output of the renewable energy power generation facility 20. That is, according to the decrease in the output of the renewable energy power generation facility 20, the input of ammonia is controlled (ammonia adjusting means), and the outputs of the steam turbine 3 and the turbine 13 (output of the power generating means) are increased.

  Thus, the power generation facilities 1 and 11 (thermal power generation facilities) in operation without affecting the supply of the main fuel input to the boiler 2 and the combustor 12 with respect to changes in the output of the renewable energy power generation facility 20 , And the required output of the load 10 can be maintained.

  The power generation facility 1 will be specifically described based on FIG.

  As shown in FIG. 2, coal (pulverized coal) is input to the boiler 2 as fuel, and steam is generated by combustion of the coal. Steam generated in the boiler 2 is introduced into the steam turbine 3 to obtain driving force. When the steam turbine 3 is driven, a power generation output is obtained by the power generator 4. The exhaust steam from the steam turbine 3 is condensed and condensed in the condenser 5, and the condensed water from the condenser 5 is supplied to the boiler 2.

The exhaust gas from the boiler 2 is discharged from the chimney to the atmosphere after NO _x is removed by the denitration device 31 (denitration means). The denitration apparatus 31 ammonia is supplied from the ammonia supply device 32, the ammonia is turned NO _x is purified in the exhaust gas. From the ammonia supply device 32, ammonia can be supplied to the boiler 2 as fuel (ammonia charging means).

  From the ammonia supply device 32, ammonia is supplied to the boiler 2 as fuel according to a command from the ammonia adjustment device 33. That is, the information on the output fluctuation of the renewable energy power generation facility 20 (see FIG. 1) is input to the ammonia adjusting device 33, and a command to input ammonia to the boiler 2 is output according to the output fluctuation.

  For example, when the output of the renewable energy power generation facility 20 (refer to FIG. 1) decreases, the ammonia adjusting device 33 so that ammonia is input to the boiler 2 in order to cover the required output of the power system 9 (refer to FIG. 1). Command is output from. Ammonia is supplied from the ammonia supply device 32 to the boiler 2 as additional fuel, and the output of the steam turbine 3 is increased to follow the decrease in the output of the renewable energy power generation facility 20 (see FIG. 1). That is, in accordance with a decrease in the output of the renewable energy power generation facility 20 (see FIG. 1), the input of ammonia is controlled and the output of the steam turbine 3 is increased.

  As a result, changes in the output of the renewable energy power generation facility 20 (see FIG. 1) are made to closely follow the output of the operating power generation facility 1 without affecting the supply of the main fuel input to the boiler 2. The required output of the load 10 can be maintained.

  In addition, it is also possible to generate hydrogen from a part of ammonia from the ammonia supply device 32 using heat in the system and supply the hydrogen to the boiler 2 (hydrogen supply means). By supplying hydrogen to the boiler 2, nitrogen oxides can be reduced by the boiler 2 without using external energy.

  Based on FIG. 3, the electric power generation equipment 11 is demonstrated concretely.

As shown in FIG. 3, the power generation facility 11 includes a compressor 16 and a turbine 13, and compressed air and fuel (gas or liquid) compressed by the compressor 16 are sent to the combustor 12. The combustion gas from the combustor 12 is expanded by the turbine 13 to obtain power, and the generator 15 is driven. Exhaust gas turbine 13 is heat recovered by the waste heat recovery boiler 17, after the NO _x is removed by the denitration apparatus 18 (denitration means) is released from a chimney into the atmosphere.

The denitration apparatus 18 ammonia is supplied from the ammonia supply device 25, the ammonia is turned NO _x is purified in the exhaust gas. From the ammonia supply device 25, ammonia as fuel can be supplied to the combustor 12 (ammonia charging means).

  From the ammonia supply device 25, ammonia is supplied to the combustor 12 as fuel by a command from the ammonia adjustment device 26. That is, the information on the output fluctuation of the renewable energy power generation facility 20 (see FIG. 1) is input to the ammonia adjusting device 26, and a command to input ammonia to the combustor 12 is output according to the output fluctuation.

  For example, when the output of the renewable energy power generation facility 20 (see FIG. 1) decreases, the ammonia adjusting device is configured so that ammonia is input to the combustor 12 in order to cover the required output of the power system 9 (see FIG. 1). A command is output from 26. Ammonia is supplied from the ammonia supply device 25 to the combustor 12 as additional fuel, and the output of the turbine 13 is increased to follow the decrease in the output of the renewable energy power generation facility 20 (see FIG. 1). That is, in accordance with a decrease in the output of the renewable energy power generation facility 20 (see FIG. 1), the input of ammonia is controlled to increase the output of the turbine 13.

  As a result, changes in the output of the renewable energy power generation facility 20 (see FIG. 1) closely follow the output of the operating power generation facility 11 without affecting the supply of the main fuel input to the combustor 12. The required output of the load 10 can be maintained.

  As shown in FIG. 4, a part of the ammonia from the ammonia supply device 25 is heated by the exhaust heat recovery boiler 17 to generate hydrogen, and the hydrogen generated by the exhaust heat recovery boiler 17 is supplied to the combustor 12. It is also possible to supply (hydrogen supply means). By supplying the hydrogen generated by the exhaust heat recovery boiler 17 to the combustor 12, the nitrogen oxide can be reduced by the combustor 12 without using external energy. Since high-temperature hydrogen is supplied to the combustor 12, it is easy to follow changes in the output of the renewable energy power generation facility 20 (see FIG. 1).

  Further, when a reburning type exhaust heat recovery boiler equipped with combustion means is applied, a part (or all) of hydrogen obtained by heating with the exhaust heat recovery boiler 17 is put into the combustion means of the exhaust heat recovery boiler. It is also possible (indicated by a dotted line in the figure). In this case, it is also possible to put a part of ammonia from the ammonia supply device 25 into the combustion means of the exhaust heat recovery boiler 17 (shown by a dotted line in the figure).

  As described above, when the output of the renewable energy power generation facility 20 decreases, ammonia is input to the boiler 2 and the combustor 12 in order to cover the required output of the power system 9, and the outputs of the steam turbine 3 and the turbine 13 are reduced. It is made to follow the fall of the output of the renewable energy power generation equipment 20.

  The change with time of the required output of power will be described with reference to FIG.

  If power generation by the renewable energy power generation facility 20 becomes unstable during the day due to changes in the natural environment, the output will decrease and become unstable with respect to the required output (shown by the solid line). (Indicated by the dotted line). By controlling the input of ammonia in the power generation facilities 1 and 11 (ammonia adjusting means) and increasing the output of the steam turbine 3 and the turbine 13 (output of the power generating means), the required output indicated by the solid line in FIG. It is possible to cover the output (net part) between the drop output indicated by the dotted line.

  In other words, by adding ammonia as a fuel, the output of the operating power generation facilities 1 and 11 can be made to follow closely without affecting the supply of the main fuel that is input to the boiler 2 and the combustor 12. The required output of the load 10 can be maintained.

  Therefore, in the power generation facility using the renewable energy power generation facility 20 and the thermal power generation facility (power generation facilities 1 and 11) at the same time, the output of the power generation facilities 1 and 11 in operation with respect to the change in the output of the renewable energy power generation facility 20 Can be made to follow in detail.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field of power generation facilities that are combined with renewable energy power generation facilities that use renewable energy.

DESCRIPTION OF SYMBOLS 1,11 Power generation equipment 2 Boiler 3 Steam turbine 4, 15 Generator 5 Condenser 9 Electric power system 10 Load 12 Combustor 13 Turbine 16 Compressor 17 Waste heat recovery boiler 18, 31 Denitration device 20 Renewable energy power generation equipment 21 Solar Photovoltaic power generation equipment 22 Wind power generation equipment 25, 32 Ammonia supply device 26, 33 Ammonia adjustment device

Claims (5)

Combustion means into which fuel is introduced;
Power generation means for generating power with energy obtained by the combustion means;
A power system to which the power generated by the power generation means is sent;
Renewable energy power generation facility connected to the power system and covered by the power demand from the power generation means ,
Ammonia charging means for charging ammonia into the combustion means;
In response to fluctuations in the output of the renewable energy power generation facility, when the power generation output for the required load is insufficient, the ammonia is added to increase the output of the power generation means to cover the required load. A power generation facility comprising: ammonia adjusting means for controlling charging of the ammonia by the charging means. The power generation facility according to claim 1,
Using a heat source in the system, hydrogen generating means for obtaining hydrogen from the ammonia input from the ammonia input means,
A power generation facility comprising: hydrogen supply means for supplying hydrogen generated by the hydrogen generation means to the combustion means. In the power generation facility according to claim 1 or claim 2,
The combustion means is a boiler that generates steam by burning fuel in a furnace,
The power generation means is a steam turbine that obtains power generation by expanding steam generated in the boiler. In the power generation facility according to claim 1 or claim 2,
The combustion means is a combustor that receives fuel and obtains combustion gas,
The power generation facility is characterized in that the power generation means is a gas turbine that expands the combustion gas obtained in the combustor to obtain power generation power. In the power generation equipment according to claim 3 or claim 4,
A denitration means for denitrating the exhaust gas of the combustion means,
The power generation facility, wherein the ammonia charging means is means for charging ammonia supplied to the denitration means into the combustion means.

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