JP3289151B2 - Pumped storage combined heat storage facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for pumping using surplus electric power at night, which consumes a small amount of electricity, and to generate electricity by flowing the pump down during the daytime when the amount of consumption is concentrated, and to load external electric power at night and day. The present invention relates to a pumped storage combined use heat storage facility for storing heat sources, such as district cooling and heating, using the storage of pumped storage power generation that aims to equalize the water level.

[0002]

2. Description of the Related Art In recent years, with the remarkable development of the socio-economic situation, demand for industrial power has increased exponentially, and room air conditioners have almost completely spread to general residential environments.
In particular, in the summertime, the power consumed for cooling has become extremely large, and a situation in which the power supply is panicked has actually become possible. This situation is particularly serious in large cities. Therefore, as one of the solutions to the above situation, redevelopment of a part of the city, a pumped-storage power generation facility to cut the peak of power consumption and to level the external power load has been developed. In consideration of this, a plan has been proposed for an urban regional pumped storage power plant that will be constructed underground and open above ground to green spaces, parks, shopping centers, etc. However, since the above-mentioned urban-type regional pumped storage power generation facility is located in the consuming area, there is an advantage that transmission and distribution loss and cost can be reduced, but there is a problem that the construction cost of the underground facility becomes considerably enormous. In addition, in the case of district heating and cooling in one area of the redeveloped city, the amount of cooling and heating required for cooling and heating is made with surplus electricity at night, this heat is stored in the heat storage tank and taken out during the day, and the external power load is leveled. Although it is necessary, since the amount of heat required for district heating and cooling is quite large, if a large-capacity heat storage tank to cover this is to be constructed underground separately from the pumped-storage power generation facility, the construction cost of this heat storage facility will be considerably high There is a problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in view of the current situation of electric power, and has been made to solve the above-mentioned problems. By storing heat, pumped-storage power generation can improve facility efficiency and operation efficiency and significantly reduce construction costs compared to the case where underground pumped storage power generation facilities and underground heat storage facilities for district cooling and heating heat sources are separately constructed. The purpose is to provide a combined heat storage facility.

[0004]

In order to achieve the above object, the present invention relates to a method of connecting an upper water storage tank and a lower water storage tank with a pumping pipe and a downflow pipe, and using the surplus electric power to store the water in the lower water storage tank. The pump is operated by a pump to be pumped to the upper reservoir through a pumping pipe, and the pumped water in the upper reservoir is drained to a lower reservoir through a downflow pipe when power consumption is concentrated. A heat exchanger cools or heats the water stored in the upper water storage tank to store heat, and the heat storage is taken out by a heat exchanger arranged in the downflow pipe and used for pumping power generation combined with district cooling and heating. It features facilities.

[0005]

As described above, since the peak of power consumption is cut by pumped storage power generation and the external power load is leveled, it is possible to avoid a situation where the power supply falls into a panic state.
By using the storage tank of pumped storage power to store the heat of the district cooling and heating heat source, the facility efficiency and operation efficiency are improved and constructed compared to the case where the underground pumped storage power generation facility and the underground heat storage facility for the cooling and heating heat source are separately constructed. A significant reduction in costs is realized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to one embodiment shown in the drawings. FIG. 1 is a layout elevation view of a pumped storage combined heat storage facility according to the present invention. In FIG. 1, reference numeral 1 denotes a pumped storage power generation facility that cuts a peak of power consumption and leveles an external power load.
Underground pumped storage combined heat storage facility that uses a heat storage tank that stores cooling and heating heat sources for cooling and heating in the area. 2 is an upper storage tank for pumped storage power generation consisting of multiple tanks. 3 is a lower storage tank for pumped storage power generation also consisting of multiple tanks. The tank 4 stores the water in the lower water tank 3 in the upper water tank 2.
5 is a downflow pipe for flowing water stored in the upper water storage tank 2 to the lower water storage tank 3. Pumping pipe 4
A heat exchanger 8 connected to a cooling / heating machine such as a heat pump 7 capable of switching between cooling and heating is provided above the pipe, and an inflow valve 9 is provided at the upper end of each upper water storage tank 2 at the upper end of the pipe. The lower end is connected to the outermost end of the lower water tank 3 that is connected to each other by the communication pipe 10. The downflow pipe 5 has a generator 11 below the pipe,
Above the pipe, a heat exchanger 12 connected to a cooling / heating facility and other heat source equipment (not shown) is provided. The upper end of the pipe is connected to the lower part of each upper water storage tank 2 via an outflow valve 13, and the lower end of the pipe is connected to The lower water tank 3 is connected to the other outermost one.

Next, a description will be given of the summer operation of the above-mentioned pumped storage combined heat storage facility 1 in which the power consumption for cooling reaches a peak. The pump 6 is operated by using the general power at night when surplus power is generated. Then, the water in the lower water storage tank 3 is pumped through the water pumping pipe 4, the inflow valve 9 is opened, and the water is stored in the upper water storage tank 2. At this time, the heat pump 7 switched to the cooling side at the same time is operated with the same nighttime electric power to cool the pumped water via the heat exchanger 8 and store the low-temperature heat in the upper water storage tank 2. At the time of social activity, when the consumption of cooling power together with power machinery, electric appliances, lighting, and various other powers peaks,
The outflow valve 13 of the upper water storage tank 2 is opened to cause the heat storage water to flow down to the lower water storage tank 3 through the downflow pipe 5, and the pumped power generated by the generator 11 on the way is reduced to general power to level the power peak. Further, the low-temperature heat storage water in the upper water storage tank 2 is exchanged with the working medium whose temperature has been raised by operating the local cooling and heating equipment and other heat source devices, and cooled by the heat exchanger 12 provided above the downflow pipe 5. The working medium is returned to the cooling and heating equipment and other heat source equipment, and the heated heat storage water passes through the downflow pipe 5, the lower water storage tank 3, and passes through the heat exchange unit 8 above the water pumping pipe 4.
Is cooled by exchanging heat with the low temperature medium, and the circulation of the stored water is repeated, and the power generation and heat storage of the pumped storage combined heat storage facility 1 are continued. At the time of heating in winter, the heat pump 7 connected to the heat exchanger 8 of the pumping pipe 4 is switched to the heating side, so that the heating water is stored in the upper water storage tank 2 to be in the heating mode.

FIG. 2A is a graph schematically showing consumption of general power, power of lighting, etc., and power for cooling / heating over a period of 24 hours a day when cooling or heating equipment is fully operated in summer or winter. as shown, when power consumption peaks, general power, power consumption P ₁ and cold such as lighting, consumption P ₂ of the heating power peaked toward hours of around 17 o'clock from around 8:00, generator Consumption, which could exceed the capacity of the plant, while general power, lighting,
In addition, the power consumptions P ₁ and P ₂ for cooling and heating are remarkably reduced, and the facility efficiency of the power plant is extremely reduced. FIG.
(B) is a graph schematically showing the power consumption when the pumped storage combined use thermal storage facility of the present invention is operated. In the pumped storage combined use thermal storage facility 1 of the present invention, as shown in FIG. until o'clock next morning 8, using the general power at night which is surplus, operation while pumping the water in the lower water storage tank 3 to the upper water tank 2 in the amount of power P _3, a heat pump 7 at a power amount P ₄ Then, the water stored in the upper water storage tank 2 is cooled or heated. From about 8 o'clock to about 17 o'clock in the daytime, the water in the upper water tank 2 is allowed to flow down to the lower water tank 3 to generate pumped water, and this power is returned to general power, so that power consumption is concentrated in the daytime. reduced amount of power up to P _5, the peak of the power consumption is leveled.

Next, a trial calculation of a model for cooling in a relatively small area will be made. <Regional scale> Total floor area of the building to be cooled = 160,000 m ² Peak load of cooling = Approximately 16,000 Mcal / h Power required for cooling (Refrigerator efficiency is assumed to be 3.0) Rating for refrigerator operation Electric energy = 16,000 (Mcal /
h) / {0.86 (Mcal / kW) X 3.0} = approximately 6200 kW General power, lighting, etc. = approximately 7700 kW (from past statistical values) <Pumping power generation> Head = 100 m Water storage = 30,000 m ³ Power generation scale = 1200 kW / h Operating time per day = 5 hours (for example, 10:00 to 15:00) Power generation per day = 1200 kW X 5h = 6,000
kWh <heat storage amount> reservoir scale = 30,000 m ³ cooling utilizing the temperature difference (cold water feed temperature - chilled water went back temperature) = 5 °
C water storage tank heat storage amount = 30,000 m ³ X 5 ° X 1.0
(Mcal / m ³ ° C) = 150,000
0Mcal ≒ 16,000Mcal / h (cooling peak load) X 9.5h (9.5 hours of peak load) According to the above calculation, 30,000 cold water lower than the outside temperature
By storing m ³ and using it for cooling with a temperature difference of 5 ° C., it is possible to obtain sufficient heat storage to cover the 6200 kW (full daytime) load of district cooling on the peak day of power consumption in summer. Power consumption by power, lighting, etc. 7700
About 16% (1200 kW) of kW will be peak-cut for 5 hours. Compared with the case where only the underground pumped storage power generation facility of 1200 kW power generation is separately constructed, in the heat storage facility combined with pumped storage power generation of the present invention, 1200 kW power generation on a peak day in summer and electric power for cooling 6200
The kW cover significantly improves facility efficiency and operation efficiency and reduces construction costs. In addition, it is a matter of course that the pumped-storage combined-use heat storage facility 1 of the present invention can be used as a heat storage tank for a period of one year and 12 months as well as a peak cut of power in a 24-hour cycle.

[0010]

As described above, according to the present invention, the upper water storage tank and the lower water storage tank are connected by the pumping pipe and the downflow pipe,
The water in the lower storage tank is pumped to the upper storage tank through a water pump by a water pump operated by using surplus electricity, and the stored water in the upper water tank is caused to flow down to the lower water tank through a downflow pipe when power consumption is concentrated. In the pumped-storage power generation to generate power, the heat stored in the upper water storage tank is cooled or heated by the heat exchanger disposed in the pumping pipe to store heat, and this heat storage is taken out by the heat exchanger disposed in the downflow pipe. Because it was used for district heating and cooling,
Pumped-storage power generation cuts the peak of power demand to equalize the power generation load, avoiding a situation where the power supply falls into a panic state, and using the pumped-storage water storage tank to store heat from the heat source for district cooling and heating. By doing so, it is possible to improve the facility efficiency and operation efficiency of both facilities and greatly reduce the construction cost compared to the case where the underground pumped storage power generation facility and the underground heat storage facility for the heating and cooling There is an effect that the realization of the energy storage facility becomes realistic.

[0011]

[Brief description of the drawings]

FIG. 1 is a layout elevation view of a pumped storage combined heat storage facility according to the present invention.

FIG. 2 (A) is a graph schematically showing power consumption of general power, lighting and the like, and power consumption of cooling and heating for 24 hours a day when cooling or heating equipment is fully operated in summer or winter. It is. (B) is a graph schematically showing the power consumption when the pumped storage combined use heat storage facility of the present invention is operated.

[0012]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat storage facility combined with pumped-storage power generation 2 Upper storage tank downflow pipe 3 Lower storage tank 4 Pumping pipe 5 Downflow pipe 6 Pumping pump 7 Heat pump 8 Heat exchanger of pumping pipe 11 Generator 12 Heat exchanger of downflow pipe

Claims (1)

(57) [Claims] 1. An upper water storage tank and a lower water storage tank are connected by a pumping pipe and a downflow pipe, and the water stored in the lower water storage tank is pumped to the upper water storage tank through a water pump by a water pump operated by using surplus power. In pumped-storage power generation, in which the pumped-up water in the upper storage tank is caused to flow down to the lower storage tank through a downflow pipe when power consumption is concentrated, the water stored in the upper storage tank is cooled or cooled by a heat exchanger disposed in the pumping pipe. A heat storage facility combined with pumped storage power generation, characterized in that heat is stored by storing heat, and the heat storage is taken out by a heat exchanger disposed in a downflow pipe and used for district cooling and heating.