JPH09217604A - Gas accumulation type electric power storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high electric power storage efficiency by a compact facility. SOLUTION: Hydrogen gas 5 occluded in a hydrogen storage alloy 1 on the low pressure side is compressed by opening a passage 3 for an accumulator by valves 19, 20 during the night when electric power is in excess, making a passage for expansion in a closed state rotating compressors 10, 11 by using inexpensive midnight electric power, and it is stored in a hydrogen storage alloy 2 on the high pressure side. At the daytime when electric power demand becomes large, the hydrogen gas 5 in an accumulated state stored in the hydrogen storage alloy 2 on the high pressure side flows to the hydrogen storage alloy 1 on the low pressure side through the passage 12 for expansion by closing the passage 3 for the accumulator and opening the passage for expansion by the valves 19, 20, it enters expanding machines 15, 16 on the way, rotates the expanding machines 15, 16, drives generators 13, 14 connected to the expanding machines 15, 16 and makes them generate electric power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure type electric power storage facility.

[0002]

2. Description of the Related Art Compressed air is stored in a tank by compressing air with a compressor by using electric power at midnight at night when electric power is surplus, and compressed air stored in the tank during daytime when power demand is high. Conventionally, a gas accumulator type electric power storage facility has been considered in which a turbine is utilized to drive a turbine to rotate a generator to generate electric power.

[0003]

However, the gas accumulator type electric power storage facility using air as the medium has the following problems.

That is, since air has a large pressure storage capacity,
A large-capacity tank is required to store compressed air,
The entire equipment becomes huge.

Further, since the power required to compress the air is large, the power storage efficiency is low.

In view of the above situation, it is an object of the present invention to provide a gas pressure type electric power storage equipment which can obtain high electric power storage efficiency with compact equipment by using hydrogen as a medium. Is.

[0007]

According to the present invention, a low pressure side hydrogen storage alloy and a high pressure side hydrogen storage alloy housed in a pressure vessel are connected by a pressure accumulating path equipped with a compressor, and The hydrogen storage alloy on the high pressure side and the hydrogen storage alloy on the low pressure side were connected by an expansion path equipped with an expander connected to the generator, and valves were attached to the pressure accumulation path and the expansion path, respectively. The present invention relates to a gas pressure storage type electric power storage facility.

In this case, a cooler for cooling the hydrogen gas by the cold heat of the liquefied natural gas may be provided on the inlet side of the compressor in the pressure accumulating path.

Further, a heater adapted to heat the hydrogen gas by the heat medium may be provided on the inlet side of the expander in the expansion path.

According to the above means, the following effects can be obtained.

At night when there is excess power, the valve opens the pressure accumulation path and closes the expansion path.

[0012] Then, the compressor is rotated by using the inexpensive late-night power to compress the hydrogen gas stored in the low-pressure side hydrogen storage alloy and store it in the high-pressure side hydrogen storage alloy in a stored state.

At this time, on the inlet side of each compressor, hydrogen gas is cooled and contracted by the cold heat of the liquefied natural gas by the cooler, so that the compression power of the hydrogen gas by the compressor is reduced.

In this way, when hydrogen gas is stored in the hydrogen storage alloy on the high-pressure side in a pressure-accumulated state, when the daytime power demand increases, the valve closes the pressure-accumulation path and opens the expansion path.

Then, the hydrogen gas in a pressure-accumulated state stored in the hydrogen storage alloy on the high pressure side flows to the hydrogen storage alloy on the low pressure side through the expansion path, and enters the expander on the way to rotate the expander. Thus, the generator connected to the expander is driven to generate power.

At this time, the temperature of the hydrogen gas is raised by a heating medium such as seawater or hot waste water from a factory, so that the output of the expander is increased and the amount of power generation is improved.

By storing hydrogen gas in the hydrogen storage alloy as a medium in this way, a large amount of hydrogen gas can be stored with a small volume of hydrogen storage alloy, and the equipment can be made compact. It will be possible.

Further, since the cold heat of the normally discarded liquefied natural gas is used to shrink the hydrogen gas in the cooler and then to compress it in the compressor, the compression power of the hydrogen gas is greatly reduced. Therefore, the power storage efficiency can be improved.

Further, since the temperature of the hydrogen gas is raised by the heating medium by the heat medium such as seawater or hot waste water from the factory, the hydrogen gas is sent to the expander. Can be improved.

As a result, the overall power storage efficiency can be increased to about 90%.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of an embodiment of the present invention.

A pressure accumulating path 3 is provided between the low-pressure side hydrogen storage alloy 1 and the high-pressure side hydrogen storage alloy 2 housed in the pressure vessel.
And coolers 6 and 7 for connecting the pressure accumulating path 3 to cool the hydrogen gas 5 by the cold heat of the liquefied natural gas 4.
The compressors 10 and 11 connected to the electric motors 8 and 9 driven by using the late-night electric power are alternately provided in a single stage or multiple stages (two stages in the figure). Here, the compressors 10, 1
1 may be connected coaxially.

Further, the high-pressure side hydrogen storage alloy 2 and the low-pressure side hydrogen storage alloy 1 are connected by an expansion path 12, and the expansion path 12 is connected to the generators 13 and 14 by an expander. 15 and 16 and heat medium 1 such as seawater or hot wastewater from factories 1
Heater 18 adapted to heat hydrogen gas 5 by 7
And are alternately single-stage or multi-stage (in the figure, expanders 15, 16
Is provided in two stages and the heater 18 is provided in one stage). Here, the expanders 15 and 16 may be coaxially connected.

Reference numeral 19 is a valve provided on the inlet / outlet side of the pressure accumulation path 3, and 20 is a valve provided on the inlet / outlet side of the expansion path 12.

Next, the operation will be described.

At night when there is excess power, the valve 19 opens the pressure accumulation path 3 and the valve 20 closes the expansion path 12.

Then, by driving the electric motors 8 and 9 using inexpensive late-night power, the compressors 10 and 11 are rotated to compress the hydrogen gas 5 stored in the hydrogen storage alloy 1 on the low pressure side, and the high pressure side. The hydrogen storage alloy 2 is stored under pressure.

At this time, on the inlet side of each compressor 10, 11, the hydrogen gas 5 is cooled and contracted by the cooling heat of the liquefied natural gas 4 by the coolers 6, 7 to shrink the compressors 10, 1.
The compression power of the hydrogen gas 5 by 1 is reduced.

In this way, when the hydrogen gas 5 is stored in the hydrogen storage alloy 2 on the high pressure side in a pressure-accumulated state, the valve 19 closes the pressure-accumulation path 3 and the valve 20 causes the expansion-path when the demand for electricity during the daytime becomes large. Open 12

Then, the hydrogen gas 5 in the pressure-accumulated state stored in the hydrogen storage alloy 2 on the high pressure side flows to the hydrogen storage alloy 1 on the low pressure side via the expansion path 12, and the expander 15,
By entering 16 and rotating the expanders 15 and 16, the generators 13 and 14 connected to the expanders 15 and 16 are driven to generate power.

At this time, the temperature of the hydrogen gas 5 is raised by the heat medium 17 such as seawater or hot waste water from a factory in the heater 18, thereby increasing the output of the expander 16 and improving the amount of power generation. .

As described above, the hydrogen storage alloys 1 and 2 are allowed to store hydrogen gas 5 as a medium, so that a large amount of hydrogen gas 5 can be stored in the hydrogen storage alloys 1 and 2 having a small volume. Therefore, the equipment can be made compact.

Further, since the cold heat of the liquefied natural gas 4, which is normally discarded, is used to shrink the hydrogen gas 5 by the coolers 6 and 7 and then the hydrogen gas 5 is compressed by the compressors 10 and 11. The compression power of No. 5 can be significantly reduced, and the power storage efficiency can be improved.

Further, since the temperature of the hydrogen gas 5 is raised by the heat medium 17 such as seawater or hot waste water from a factory in the heater 18 and then sent to the expander 16, the output of the expander 16 is increased. Therefore, the amount of power generation can be improved.

As a result, the overall power storage efficiency can be increased to about 90%.

FIG. 2 shows an example in which the gas pressure type electric power storage equipment is applied to a boiler power generation equipment. In the figure, 21 is a liquefied natural gas tank for storing liquefied natural gas 4 and 22 is a liquefaction from the liquefied natural gas tank 21. A fuel supply system for supplying the natural gas 4, 23 and 24 are evaporators for heating the liquefied natural gas 4 provided in the fuel supply system 22 into the natural gas, 25 is a boiler using the natural gas as a fuel, 26 is a water supply system of the boiler 25, 27 is a steam turbine provided in the water supply system 26, and 28 is a condenser.

In the boiler power generation facility, the liquefied natural gas 4 from the liquefied natural gas tank 21 is fed to the boiler 25 via the fuel supply system 22, and the liquefied natural gas 4 is vaporized by the evaporators 23 and 24 on the way. To produce natural gas, and the boiler 25 burns the natural gas.

In the boiler 25, the boiler feed water is circulated through the water supply system 26, and the combustion of natural gas in the boiler 25 evaporates the boiler feed water that has entered the boiler 25 to generate steam, which is then steam turbine. Electric power is generated by sending the steam to the steam generator 27 to rotate the steam turbine 27, and the steam rotated by the steam turbine 27 is sent to the condenser 28 to be condensed in the condenser 28 and then circulated to the boiler 25.

In such a boiler power generation facility, since the evaporators 23 and 24 and the condenser 28 normally use seawater or the like as a heat medium, the cold heat of the liquefied natural gas 4 and the hot heat of the steam are transferred to the sea. Abandoned

However, since the gas pressure type electric power storage equipment according to the present invention is compact, it can be installed in the existing boiler power generation equipment sufficiently, and when it is installed in the boiler power generation equipment. , The evaporators 23 and 24 in the middle of the fuel supply system 22 are used as the coolers 6 and 7, and
It is possible to use the condenser 28 and the like in the middle of the water supply system 26 as the heater 18, whereby it is possible to effectively recover and use the cold heat of the liquefied natural gas 4 that has been wasted and the warm heat of the steam. It is possible to improve the overall equipment efficiency including the boiler power generation equipment.

It should be noted that the present invention is not limited to the above-described embodiment, but can be attached to various plants other than the boiler power generation facility, and the like.
Needless to say, various changes can be made without departing from the scope of the present invention.

[0043]

As described above, according to the gas pressure type electric power storage equipment of the present invention, it is possible to obtain an excellent effect that a high electric power storage efficiency can be obtained with a compact equipment.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of an embodiment of the present invention.

FIG. 2 is a system diagram when FIG. 1 is applied to a boiler power generation facility.

[Explanation of symbols]

 1, 2 Hydrogen storage alloy 3 Storage path 4 Liquefied natural gas 5 Hydrogen gas 6,7 Cooler 8,9 Electric motor 10,11 Compressor 12 Expansion path 13,14 Generator 15,16 Expander 17 Heat medium 18 Heating Vessel 19, 20 valves

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02C 6/14 F02C 6/14

Claims (3)

[Claims] 1. A low pressure side hydrogen storage alloy and a high pressure side hydrogen storage alloy housed in a pressure vessel are connected by a pressure accumulating path equipped with a compressor, and a high pressure side hydrogen storage alloy and a low pressure side are stored. Gas storage type electric power, characterized in that it is connected to the hydrogen storage alloy on the side by an expansion path equipped with an expander connected to a generator, and valves are attached to the pressure accumulation path and the expansion path, respectively. Storage equipment. 2. The gas pressure type electric power storage facility according to claim 1, wherein a cooler configured to cool hydrogen gas by cold heat of liquefied natural gas is provided on the inlet side of the compressor of the pressure accumulation path. 3. The gas pressure type electric power storage facility according to claim 1, wherein a heater adapted to heat the hydrogen gas by a heat medium is provided on the inlet side of the expander of the expansion path.