JPH1182912A - Hot water heat accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water heat accumulator accumulating heat of surplus steam generated by gas turbine facilities with the form of usable hot water without waste. SOLUTION: A hot water heat accumulator is structured as follows. It is provided with a hot water cistern 12 storing hot water and a hot water generator 18 at the outer part of the hot water cistern 12. Lower temperature hot water is conducted from the lower part of the hot water cistern 12 by the hot water generator 18 and fed to the hot water cistern 12 heating the hot water mixing it with steam from the outside. A hot water taking out path 45 for taking out the hot water and feeding it to hot water using part is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heat storage device capable of storing heat of steam generated in gas turbine equipment or the like as hot water without waste.

[0002]

2. Description of the Related Art Conventionally, in a factory or the like, in order to promote energy saving, power is generated by a gas turbine, and steam is generated by recovering exhaust heat of the gas turbine to cope with heat demand for cooling and heating and hot water supply. Gas turbine equipment such as systems has been introduced. However, in recent years, the ratio of electricity demand to steam demand has been increasing in factories, and excess steam is often generated in the cogeneration system and the like. In that case, the exhaust heat of the gas turbine is not recovered, but is released to the atmosphere as it is, or is often discarded in the form of excess steam.
Heat recovery efficiency is low.

Therefore, as means for effectively utilizing such excess steam, a small-capacity inner tank having a communication hole with the hot water tank is installed at the lower portion of the hot water tank, and a pipe having an injection pipe at the tip is provided. By disposing a heat exchanger in the inner tank and supplying steam to the heat exchanger from the outside, the steam is blown into the inner tank to heat water, and heat exchange in the inner tank from the outside is performed. There is known a feed water heating device in which hot water in an inner tank is taken out by a hot water take-out pipe facing downward of a vessel (see FIG. 6).
3-179405).

[0004]

However, in the case of the above-mentioned feed water heating apparatus, the inlet of the hot water outlet pipe, that is, the hot water outlet, is disposed below the heat exchanger so that steam does not enter, so that the hot water It will be located at the bottom of the tank.
On the other hand, the hot water heated by the steam rises above the hot water tank. Therefore, the hot water that has risen cannot be taken out from the hot water outlet located at the lower portion in the hot water tank, so that there is much thermal waste. For this reason, it is impossible to store a large amount of excess steam.

Therefore, the present invention provides a cogeneration system, a combined cycle in which a gas turbine is combined with a steam turbine using steam generated by heat recovery of exhaust gas as a working fluid, a large amount of power generated in various power generation plants, boiler equipment, and the like. It is an object of the present invention to provide a hot water heat storage device capable of efficiently storing excess steam as usable high-temperature water.

[0006]

Means for Solving the Problems In order to achieve the above object, a hot water heat storage device according to claim 1 is provided with a hot water tank for storing hot water and drawn out from a lower portion of the hot water tank provided outside the hot water tank. It is provided with a hot water generator for supplying high-temperature hot water by mixing steam from the outside with low-temperature hot water and supplying the hot water to a hot water tank, and a hot water extracting passage for taking out hot water to be supplied to a hot water using section from an upper portion of the hot water tank. I have.

[0007] According to the hot water heat storage device, low-temperature hot water derived from the lower portion of the hot water tank and steam from the outside are mixed in the hot water generator, converted into high-temperature hot water, and supplied to the hot water tank. High-temperature hot water is taken out from the upper part of the hot water tank and supplied to the hot water usage part, and low-temperature hot water at the lower part of the hot water tank is led out to the hot water generator. It is stored and can store enough heat in the entire hot water tank. In addition, by extracting high-temperature hot water from the upper part of the hot water tank, the stored high-temperature hot water can be used effectively.
In addition, since the hot water generator is provided outside the hot water tank,
Maintenance is easy, the control of the amount of low-temperature water drawn from the hot water tank to the hot water generator becomes easy, and the temperature control of high-temperature water produced by the hot water generator also becomes easy.

A hot water heat storage device according to a second aspect of the present invention includes a cogeneration system having a gas turbine and a waste heat boiler that generates steam by using exhaust gas discharged from the gas turbine as a heat source. A hot water tank, and a hot water generator that is provided outside the hot water tank and mixes steam from the waste heat boiler with low-temperature hot water derived from a lower portion of the hot water tank to produce high-temperature hot water and supplies the hot water to the hot water tank And a hot water extraction passage for extracting hot water to be supplied to the hot water use section from an upper portion of the hot water tank.

According to the hot water heat storage device, the low-temperature hot water derived from the lower portion of the hot water tank and the steam generated by the exhaust heat boiler using the exhaust gas of the gas turbine as a heat source are mixed by the hot water generator to generate a high-temperature hot water. Since it is changed to hot water and supplied to the hot water tank, a large amount of excess steam in the gas turbine equipment can be stored as hot water. In addition, high-temperature hot water is taken out from the upper part of the hot water tank and supplied to the hot water use part, and low-temperature hot water at the lower part of the hot water tank is led to the hot water generator, so that there is a relatively small temperature difference from the lower part to the upper part of the hot water tank. Hot water is stored, and heat can be sufficiently stored in the entire hot water tank. Also, by taking out high-temperature hot water from the upper part of the hot water tank, the stored hot water can be used effectively. Furthermore, since the hot water generator is provided outside the hot water tank, maintenance is easy, the control of the amount of low-temperature water flowing from the hot water tank to the hot water generator is easy, and the temperature control of the high-temperature water generated by the hot water generator is also easy. It will be easier.

A third aspect of the present invention provides the hot water heat storage device according to the first or second aspect, further comprising an injection passage for injecting the hot water from the hot water generator below a surface of the hot water tank. According to this hot water heat storage device, the saturation temperature of the hot water injected into the hot water tank from the hot water generator exceeds 100 ° C. due to the head pressure of the hot water stored in the hot water tank. As a result, it is possible to reliably prevent the heat efficiency of the mixing from lowering, and also to prevent the generated steam from being sucked into a water supply pump usually provided in the middle of the hot water discharge passage to generate cavitation.

According to a fourth aspect of the present invention, there is provided the hot water heat storage device according to any one of the first to third aspects, wherein the inlets of the hot water discharge passage are arranged at a plurality of different locations in the hot water tank. According to this hot water heat storage device, the hot water can be uniformly taken out from a wide area in the hot water tank in the hot water tank, so that it is possible to prevent the occurrence of a dead water area where the hot water always remains without being taken out.

According to a fifth aspect of the present invention, there is provided the hot water heat storage device according to any one of the first to third aspects, based on a temperature of the hot water entering the hot water generator and a temperature of the hot water discharged from the hot water generator. Hot water control means for controlling the amount of hot water drawn out from the lower part of the hot water tank to the hot water generator and the amount of steam supplied to the hot water generator to maintain the temperature of the discharged hot water within a predetermined range. Have. According to this hot water heat storage device, low-temperature hot water derived from the lower portion of the hot water tank can always be heated to high-temperature hot water within a predetermined temperature range and returned to the upper portion of the hot water tank.

A hot water heat storage device according to a sixth aspect of the present invention is the hot water heat storage device according to any one of the first to fifth aspects, wherein the cold water supply passage for supplying cold water to the hot water tank, and the cold water supply passage based on a water level in the hot water tank. Water level control means for adjusting the supply amount of cold water from the passage to the hot water tank to maintain the water level within a predetermined range, wherein an inlet of the hot water discharge passage is arranged below the predetermined range. According to this hot water heat storage device, even when hot water is taken out to the hot water use section, the water level of the hot water tank can be always kept within a predetermined level range, and the hot water can be reliably taken out from a position below the water level.

According to a seventh aspect of the present invention, in the hot water heat storage device of the sixth aspect, an outlet of the cold water supply passage is arranged below the hot water tank. According to this hot water heat storage device, the hot water in the upper layer of the hot water tank can be maintained at a high temperature without mixing the high-temperature hot water in the upper layer of the hot water tank and the cold water supplied to the hot water tank from the cold water supply passage.

According to an eighth aspect of the present invention, there is provided the hot water heat storage device according to any one of the first to seventh aspects, wherein the hot water is taken out from a position below an inlet of the hot water discharge passage and guided to the hot water discharge passage. A passage, and a control valve for opening the auxiliary hot water passage when the water level of the hot water tank falls below a certain level. According to this hot water heat storage device, even when the water level of the hot water tank falls below the inlet of the hot water discharge passage, the hot water in the hot water tank can be continuously guided from the auxiliary hot water passage to the hot water discharge passage and taken out to the hot water use section. it can.

According to a ninth aspect of the present invention, there is provided the hot water heat storage device according to any one of the first to eighth aspects, wherein the hot water generator ejects the steam and sucks the low-temperature hot water by its ejector effect. Consists of a valve. According to this hot water heat storage device, low-temperature hot water can be led from the lower portion of the hot water tank to the hot water generator without using a water supply pump, so that the device can be simplified and power energy can be reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment in which the present invention is applied to a cogeneration system including a gas turbine and a waste heat boiler. In FIG. 1, a gas turbine 1 compresses air by a compressor 2 and guides it to a combustor 3, and injects and burns a gas fuel such as a liquid fuel or a city gas into the combustor. The turbine 4 is driven by the combustion gas. The turbine 4 drives the compressor 2 and also drives the generator 7 via the speed reducer 5 and the coupling 6. The generated power from the generator 7 is supplied to various power loads.

The exhaust gas G of the gas turbine 1 is guided to a waste heat boiler 9 provided in an exhaust gas channel 8,
Released into the atmosphere through the chimney 10. On the other hand, when the gas turbine fuel is liquid, the hot water taken out from the hot water tank 12 storing hot water by the water supply pump 14 is preheated by indirect heat exchange with steam in the water supply preheater 15,
The temperature is further increased by heat exchange with the exhaust gas G in the economizer 16 in the chimney 10 and then supplied to the exhaust heat boiler 9. The waste heat boiler 9 is provided with the supplied hot water and the exhaust gas passage 8.
A large amount of steam is generated by heat exchange with the exhaust gas G introduced into the tank. This steam is supplied as process steam SP to various steam-using devices such as the water supply preheater 15, a heating / cooling device, and a hot water supply device via an on-off valve 17 and a pressure control valve (not shown), and is used in these devices. Excess steam S that cannot be stored is stored in the hot water tank 12 as high-temperature hot water as described later.

Outside the hot water tank 12, there is provided a hot water generator 18 which mixes low-temperature hot water WL derived from the lower part of the hot water tank with steam S from the outside to form high-temperature hot water WH and supplies it to the hot water tank 12. Is provided. Thus, the hot water generator 18
Is provided outside the hot water tank 12, maintenance of the hot water generator 18 is facilitated, and the hot water tank 1 is provided.
The control of the amount of the low-temperature hot water WL derived from the second water 2 becomes easy, and the temperature control of the high-temperature hot water WH generated by the hot water generator 18 also becomes easy.

The hot water generator 18 blows out the steam from the outside, and the ejector effect causes the hot water tank 12 to emit the steam.
And an ejector valve for sucking the low-temperature hot water WL from below. In this way, by configuring the hot water generator 18 with the ejector valve, without using a water supply pump,
A low-temperature hot water WL is supplied from a lower portion of the hot water tank 12 to a hot water generator 18.
Can be derived, so that the device can be simplified and the power energy can be reduced. In this case, surplus steam S of the process steam SP is used as the external steam.

A low-temperature water suction passage 19 which connects the lower part of the hot water tank 12 with the hot water generator 18 has a temperature sensor 20 for detecting the temperature of the hot water WL passing through the passage, and controls the flow rate of the hot water. A flow control valve 21 is provided. The steam supply passage 22 for supplying the surplus steam S to the hot water generator 18 has a pressure sensor 23 for detecting the pressure of the steam passing through the passage 22 and a flow control valve 24 for controlling the flow rate of the steam S. Is provided. Further, an injection passage 25 for injecting the high-temperature hot water WH produced by the hot water generator 18 into the hot water tank 12 has a temperature sensor 26 for detecting the temperature of the hot water WH passing through the passage 25, and a check valve 27.
Is provided.

The temperature signals of the temperature sensors 20 and 26 are transmitted to a control circuit 28, and the control circuit 28 adjusts the opening of the flow control valves 21 and 24 based on the temperature signals. The hot water generator 1 is controlled by the temperature sensors 20 and 26, the flow control valves 21 and 24, and the control circuit 28.
A temperature control means 29 is configured to maintain the temperature of the hot water discharged from the nozzle 8 within a predetermined range. Thus, by configuring the temperature control means 29, the low-temperature hot water WL derived from the lower portion of the hot water tank 12 can be constantly heated to the high-temperature hot water WH within a predetermined temperature range and returned to the upper portion of the hot water tank 12. it can.

An opening signal from the control circuit 28 to the flow control valve 24 is transmitted to the flow control valve 24 via a low selector device 30, and the control circuit 28 detects the pressure of the excess steam S detected by the pressure sensor 23. Control valve 2 while monitoring
4 is controlled. As a result, it is possible to prevent the pressure of the process steam SP from decreasing in other steam-using devices until the use of the process steam SP is hindered. In the low selector device 30, a pressure lower limit value of the surplus steam S detected by the pressure sensor 23 is set in advance, and when the pressure of the surplus steam S reaches the lower limit value, the control of the control circuit 28 takes precedence. , The low selector device 30 controls the flow control valve 24 in the closing direction so that the steam pressure is maintained. Accordingly, when the inlet pressure of the hot water generator 18 decreases until the hot water generator 18 cannot perform its function, the low pressure switch 61 is operated to send a pressure drop detection signal to the control circuit 28, and this control circuit 28, the flow control valve 24 is fully closed, the supply of the surplus steam S is stopped, and the operation of the hot water generator 18 is stopped.

In the steam supply passage 22, steam traps 33 and 34 are provided in drain passages 31 and 32 branching upstream and downstream of the flow control valve 24, respectively. The injection port of the injection passage 25 is set to be located below the water surface of the hot water tank 12. As a result, the hot water generator 18
The saturation temperature of the high-temperature hot water WH injected into the hot water reaches a value exceeding 100 ° C. (for example, 105 ° C.), and the injected hot water is vaporized in the hot water tank 12 to lower the heat efficiency of mixing, or the generated steam is discharged with hot water. It is possible to prevent the water from being sucked into the water supply pump 14 from the passage 45 and causing cavitation in the pump.

The hot water tank 12 is supplied with condensed water slightly higher than room temperature and soft water at room temperature collected from steam facilities in the factory from the cold water supply passages 35 and 36, respectively. The outlets of the cold water supply passages 35 and 36 are arranged below the hot water tank 12. Since the soft water has a lower temperature than the condensed water, the outlet of the cold water supply passage 36 for soft water is set at a position slightly (about 150 mm) lower than the outlet of the cold water supply passage 35 for condensed water. Thus, the cold water supplied from the cold water supply passages 35 and 36 to the hot water tank 12 does not mix with the high temperature hot water in the upper layer of the hot water tank 12, and the high temperature hot water is supplied to the upper layer of the hot water tank 12 by the supplied cold water. Because it is pushed up, the warm water in the upper layer can always be maintained at a high temperature. Also, siphon break holes 37, 3 are provided at positions higher than the water surface of the hot water tank 12 in the cold water supply passages 35, 36, respectively.
8 are provided. Thereby, it is possible to prevent the cold water at the lower portion of the hot water tank 12 from rising in the cold water supply passages 35 and 36.

The cold water supply passage 36 for soft water is communicated with a water storage device 41 via a raw water pump 39 and a soft water device 40. The normal temperature cold water pumped from the water storage device 41 by the raw water pump 39 is, for example, ionized water. The water is softened by removing magnesium ions, calcium ions and the like in the water softener 40 containing the exchange resin, and then supplied to the hot water tank 12. A level transmitter 42 for detecting the water level of the hot water tank 12 based on the water head pressure at the lower part of the hot water tank 12 is provided, and a level signal from the level transmitter 42 is transmitted to the control circuit 43.

The control circuit 43, based on the level signal from the level transmitter 42, controls the chilled water supply passage 36 for soft water.
Of the raw water pump 39 is controlled. Thus, the supply amount of soft water from the cold water supply passage 36 to the hot water tank 12 is adjusted, the water level of the hot water tank 12 in the normal operating state, held within a predetermined range from the upper level L _U until the lower level L _D Is done. That is, the raw water pump 39, the level transmitter 42, and the control circuit 43 constitute a water level control means 44 for maintaining the water level of the hot water tank 12 within a predetermined range.

By configuring the water level control means 44 in this way, even if hot water is taken out of the hot water tank 12 into the hot water use section, the water level of the hot water tank 12 can be always kept within a predetermined level range. Hot water can be reliably taken out from a position below the water level. The position close to the upper level L _U within a predetermined range of the water level in the hot water tank 12, Yes and communicates the overflow passage 50, the hot water overflow is discharged into the pit from the passageway.

Further, the hot water tank 12 communicates with a hot water discharge passage 45 for taking out hot water W from the upper portion thereof and supplying the hot water W to a hot water use section. The inlet of the passage has a temperature controlled by the water level control means 44. Two different places below a predetermined range of the water level of the water tank 12, that is, for example, the hot water WH
Are arranged at positions 90 ° apart from each other in the circumferential direction from the injection port of the injection passage 25 to the left and right. This allows
In the hot water tank 12, the hot water W can be uniformly taken out from the two regions separated by 180 °, so that it is possible to prevent a dead water area that always remains without being taken out. The hot water discharge passage 45 may be distributed and arranged in a larger number, so that the hot water can be discharged more uniformly.

Corresponding to each of the hot water discharge passages 45, there is provided an auxiliary hot water passage 46 for taking out the hot water W from a position below the inlet of each of the hot water discharge passages 45 and guiding it to each of the hot water discharge passages 45. . Each of the auxiliary hot water passages 46 is provided with a control valve 47 that opens when the water level of the hot water tank 12 falls below a certain level slightly above the inlet of the hot water discharge passage 45. The opening of the control valve 47 is performed by the control circuit 43 based on the level signal of the level transmitter 42 described above. The inlet of each of the hot water discharge passages 45 and the auxiliary hot water passages 46 is set to have an ascending gradient of about 1/10 toward the inlet. This can prevent air from accumulating in these passages.

The hot water discharge passage 45 allows the hot water tank 12
Hot water W taken out of the tank is supplied to a hot water use unit such as a combustion boiler other than the gas turbine 1 or a feed preheater 15 of the gas turbine via the feed water header 48 and the feed pumps 13 and 14. . A drain passage 49 for discharging a drain D having a water temperature of about 95 ° C. is connected to a steam passage of the feed water preheater 15, and an outlet of the drain passage 49 has a water tank wall surface located above the water surface of the hot water tank 12. It is arranged along. Thereby, the water supply preheater 15
When the high-temperature drain D discharged in step (1) is collected in the hot water tank 12, the water surface of the hot water tank 12 can be prevented from foaming. Hot water tank 1
An air vent 51 is provided at the upper part of the second.

Next, the operation of the hot water heat storage device will be described. Of the saturated steam generated in the exhaust heat boiler 9 of the gas turbine equipment, surplus steam S that cannot be used as the process steam SP in steam-using equipment such as a heating / cooling device and a hot-water supply device flows from the steam supply passage 22 to the flow control valve 24. Is supplied to the hot water generator 18 via the. In the hot water generator 18, the ejector effect by the ejection of the surplus steam S causes
The low-temperature hot water WL at the lower portion of the hot water tank 12 is sucked from the low-temperature water suction passage 19 through the flow control valve 21, and the steam S is mixed with the hot water WL to discharge the high-temperature hot water WH. The high-temperature hot water WH discharged from the hot water generator 18 is injected into the upper part of the hot water tank 12 from the injection passage 25 through the check valve 27. Thereby, in the hot water tank 12, stratified hot water is stored such that the upper layer becomes high-temperature hot water and the lower layer becomes low-temperature hot water. Thus, the amount of heat of the surplus steam S is
Heat is stored inside.

The hot water in the hot water tank 12 is taken out from the upper part of the hot water tank 12 through a hot water take-out passage 45. That is, high-temperature hot water is taken out from the upper portion of the hot water tank 12, and low-temperature hot water WL is led out to the hot water generator 18 from the lower portion. Therefore, warm water having a relatively small temperature difference is stored in the hot water tank 12 from the lower part to the upper part.
The heat can be sufficiently stored over the entire area. Further, since the hot water W is taken out from the upper part of the hot water tank 12, high-temperature hot water can be taken out efficiently.

The hot water W discharged from the hot water generator 18
The temperature of H is maintained within a predetermined range by the following control by the hot water control means 29. That is, when the temperature of the discharged hot water WH from the hot water generator 18 detected by the temperature sensor 26 is lower than a predetermined range, the flow control valve of the low temperature water suction passage 19 is controlled by the opening control signal from the control circuit 28. The opening degree of 21 is reduced, and the amount of low-temperature hot water led out to the hot water generator 18 from the lower part of the hot water tank 12 is limited.
Conversely, when the temperature of the discharge hot water WH becomes higher than a value in a predetermined range, the opening degree of the flow control valve 21 is increased, and the amount of the low-temperature hot water guided to the hot water generator 18 is increased. . The opening degree of the flow control valve 21 is determined by the temperature sensor 2
Introduced hot water WL to hot water generator 18 detected by 0
The temperature is also adjusted according to the temperature.

If the temperature of the discharge hot water WH becomes higher than a predetermined range with the flow control valve 21 fully opened, the flow control valve of the steam supply passage 22 is controlled by an opening control signal from the control circuit 28. 24, the degree of opening is reduced, and the hot water generator 1
8 is suppressed. Further, when the pressure of the steam from the steam supply passage 22 detected by the pressure sensor 23 drops below a value preset in the low selector device 30, the flow control valve is given priority over the opening control by the control circuit 28. 24 is controlled by the low selector device 30 in the closing direction so that the steam pressure is maintained. Thereby, when the steam pressure at the inlet of the hot water generator 18 decreases until the hot water generator 18 cannot perform its function, the low pressure switch 61 is operated, and the flow control valve 24 is fully closed via the control circuit 28. As a result, the supply of the surplus steam S to the hot water generator 18 is automatically stopped.

FIG. 2 is a graph showing an example of the hot water control. In FIG. 2, the vertical axis on a logarithmic scale represents the temperature (°
C), steam pressure (kg / m ² G) and suction volume (m ³ / h)
The horizontal axis indicates the heating time (hr). A graph G1 plotted with a mark indicates steam pressure (kg / m ² G), and a graph G2 plotted with a mark indicates low-temperature hot water WL sucked into the hot water generator 18.
G in which the inhalation amount (m ³ / h) of
3 is the temperature of the hot water WH discharged from the hot water generator 18 (°
C) is a graph G4 in which the temperature (° C.) of the suction hot water WL is plotted with a circle, and a graph G5 is plotted with a square.
Indicates the total amount of steam (ton) supplied to the hot water generator 18.

In this hot water control example, first, the discharge hot water WH
The opening degree of the flow control valve 21 on the suction hot water side is reduced so that the temperature difference between the suction hot water WL and the hot water WL becomes 37 ° C., and the flow control valve 24 on the steam side is fully opened (step 1). Next, the flow rate control valve 21 on the suction hot water side is opened and the flow rate control valve 24 on the steam side is fully opened so that the temperature of the discharge hot water WH does not exceed 95 ° C. (step 2). Further, when the temperature of the discharge hot water WH is about to rise further in a state where the flow rate control valve 21 on the suction hot water side is fully opened under the state where the temperature of the discharge hot water WH is controlled to 95 ° C. Then, the opening degree of the flow control valve 24 on the steam side is reduced (step 3). Further, when the steam pressure becomes 1 (kg / m ² G) or less, the two flow control valves 21 and
4 are fully closed, and the heating operation ends (step 4).

The warm water stored in the warm water tank 12 is driven by the water supply pumps 13 and 14 in a normal operation state in which the water level is controlled within the range of the upper level L _U and the lower level L _D. From 45, a water supply header 48 is supplied to the water supply preheater 15 on the gas turbine equipment side and other steam-using equipment. When the water level decreases with the use of warm water, the level transmitter 42 detects a change in the water level. Upon receiving the level signal, the control circuit 43 sets the chilled water supply passage 3
6 is driven. The cold water drawn from the water storage device 41 is softened through the water softening device 40 and supplied to the hot water tank 12. Thereby, the water surface of the hot water tank 12 is maintained within the range of the predetermined level.

When the ion exchange resin of the water softener 40 is to be replaced, for example, the hot water tank
Supply of soft water is stopped, and supply of cold water is only condensed from the other cold water supply passage 35. If the use of hot water continues in this state, the water level during normal operation cannot be maintained. The water level of the hot water tank 12 is lowered. Water level at this time, the lower than the lower level L _D, and the decreases to slightly higher degree of level than the inlet of the hot water extraction passage 45, the water level at this time the level transmitter 42 detects.
Upon receiving the level signal, the control circuit 43 opens the control valve 47 of the auxiliary hot water passage 46. Thus, even if the water level of the hot water tank 12 drops below the inlet of the hot water discharge passage 45, the hot water in the hot water tank 12 passes through the auxiliary hot water passage 46 and the hot water discharge passage 4.
5, it is possible to use hot water afterwards,
There is no hindrance to the supply of hot water to boilers and the like.

In the above-described embodiment, an example is shown in which, of the saturated steam generated in the gas turbine equipment, the excess steam S that cannot be used as the process steam SP is used to heat the hot water below the hot water tank 12. However, surplus steam generated in a combined cycle, various power plants, boiler facilities, and the like may be used for heating the hot water in the hot water tank 12.

[0041]

As described above, according to the hot water storage device according to the first aspect of the present invention, high-temperature hot water is taken out from the upper part of the hot water tank and supplied to the hot water use part, and low-temperature hot water at the lower part of the hot water tank is Since the hot water is led out to the hot water generator, hot water having a relatively small temperature difference is stored from the lower portion to the upper portion of the hot water tank, so that sufficient heat can be stored in the entire hot water tank. Further, the stored high-temperature hot water is taken out from the upper portion of the hot water tank and can be used without waste. Furthermore, since the hot water generator is provided outside the hot water tank, maintenance is easy, the control of the amount of low-temperature water led out of the hot water tank is easy, and the temperature control of the high-temperature water produced by the hot water generator is also easy.

According to the hot water heat storage device of the second aspect of the present invention, in addition to the effect of the first aspect, a large amount of excess steam in the gas turbine equipment can be stored with high thermal efficiency as high-temperature hot water.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a hot water heat storage device according to one embodiment of the present invention.

FIG. 2 is a graph showing hot water heating control in the hot water heat storage device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas turbine, 9 ... Waste heat boiler, 12 ... Hot water tank, 1
8 hot water generator, 25 injection path, 29 hot water control means, 35, 36 cold water supply path, 44 water level control means
45: hot water discharge passage, 46: auxiliary hot water passage, 47: control valve, G: exhaust gas

Claims (9)

[Claims] 1. A hot water tank for storing hot water, and a high-temperature hot water produced by mixing steam from the outside with low-temperature hot water provided outside the hot water tank and derived from a lower portion of the hot water tank to produce the high-temperature hot water. A hot water heat storage device comprising: a hot water generator for supplying hot water to the hot water tank; 2. A gas turbine, an exhaust heat boiler for generating steam using exhaust gas discharged from the gas turbine as a heat source, a hot water tank for storing hot water, and a hot water tank provided outside the hot water tank. The steam from the waste heat boiler is mixed with the low-temperature hot water derived from the lower part to produce high-temperature hot water and supplied to the hot water tank, and the hot water supplied to the hot water use part is taken out from the upper part of the hot water tank. A hot water heat storage device including a hot water extraction passage. 3. The hot water heat storage device according to claim 1, further comprising an injection passage for injecting hot water from the hot water generator below a surface of the hot water tank. 4. The method according to claim 1, wherein
A hot water heat storage device, wherein the inlet of the hot water discharge passage is disposed at a plurality of different locations in a hot water tank. 5. The method according to claim 1, wherein
Based on the temperature of the hot water entering the hot water generator and the temperature of the hot water discharged from the hot water generator, the amount of hot water discharged from the lower part of the hot water tank to the hot water generator and the amount of steam supplied to the hot water generator And a hot water control device for controlling the temperature of the discharged hot water within a predetermined range. 6. The method according to claim 1, wherein
A cold water supply passage for supplying cold water to the hot water tank, and a water level control for adjusting a supply amount of the cold water from the cold water supply passage to the hot water tank based on a water level of the hot water tank to maintain the water level within a predetermined range. Means, wherein an inlet of the hot water discharge passage is disposed below the predetermined range. 7. The hot water heat storage device according to claim 6, wherein an outlet of the cold water supply passage is disposed below the hot water tank. 8. The method according to claim 1, wherein
An auxiliary hot water passage that extracts hot water from a position below the inlet of the hot water extraction passage and guides the hot water to the hot water extraction passage; and a control valve that opens the auxiliary hot water passage when the water level of the hot water tank falls below a certain level. Hot water storage device equipped with 9. The method according to claim 1, wherein
The hot water heat storage device is an ejector valve that ejects the steam and sucks the low-temperature hot water by an ejector effect.