JPS63253102A - Compound generating system - Google Patents

Abstract

PURPOSE:To improve utilization efficiency and save energy by recovering heat such as industrial waste heat, etc., by means of a heat pump system to accumu late the heat in a heat accumulating medium in a heat accumulating system, and converting the quantity of heat into electric power energy by means of a generating system. CONSTITUTION:Environmental heat such as industrial waste heat, etc., is recovered by an evaporator 5 in a heat pump system 1. A high temperature working fluid heated by the evaporator 5 is compressed by a compressor 7, heats a working fluid from a low temperature bath 13 through a condenser 9, and is accumulated in a high temperature bath 12. The heated high tempera ture working fluid circulates to the low temperature bath 13 through an evapora tor 22, heats and evaporates a working fluid in an organic Rankine cycle gener ating system 18, generates electricity through a turbine 23, and a generator 24. Then, the high temperature working fluid passes through a condenser 25, and is preheated by environmental heat through a preheater 20, and continues to circulate. The heat sources such as industrial waste heat, geothermal energy, etc., can therefore be efficiently utilized and energy can also be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combined power generation system that uses environmental heat as a main or auxiliary heat source and is a combination of a heat pump device, a heat storage device, and a power generation device.

Conventional technology In recent years, maximum power demand has continued to increase due to the rapid spread of not only industrial equipment but also air conditioning equipment for general businesses and homes, while the load factor has continued to decline. . This is causing a decline in the utilization rate of power generation facilities or the need to develop new power sources.

Also, about half of the primary energy consumed is
It is released into the environment without being used in the form of waste heat. It is important to effectively recover and utilize this emitted energy.

Therefore, as one of these measures, for example, by using low-floor surplus electricity at night, peak loads during the day can be reduced.
A device that generates a discharge at the time of loading is known in the art.

That is, a large-scale power generation device is pumped storage power generation, and a small-scale power generation device is a storage battery.

To briefly explain these, in Moeha's pumped storage power generation, a hydraulic turbine generator that can also be used as a pump is installed between regulating reservoirs with a difference in head, and surplus electricity from thermal power is used at night to transfer from the lower regulating reservoir to the upper regulating reservoir. This is a device that pumps up water and releases it to the lower regulating pond during peak load periods during the day to generate electricity.

On the other hand, in the latter storage battery, surplus power (energy) at night is stored as chemical energy within the storage battery, and like the former, this chemical energy is reversibly converted back into electrical energy during peak loads during the day. This is a device to take it out.

Problems to be Solved by the Invention The conventional power generating apparatus described above, however, has the following problems.

The utilization efficiency of nighttime power from pumped storage power generation and storage batteries is based on the power input (human energy) added at night.
On the other hand, the output (output energy) during daytime extraction is about 60 to 7
Currently, it is around 0%.

However, pumped storage power generation has the disadvantage that the installation points are extremely limited due to the need to obtain a head and water resources, and are generally far from areas with large demand for electricity. Moreover, it had the disadvantage that unless the capacity was increased, there would be no benefits in terms of efficiency or economy.

On the other hand, storage batteries have a small capacity and a very short service life, so in practice they cannot meet the demand for electricity all the time, and they also have the disadvantage of being high in cost.

Means for Solving the Problems In order to solve these conventional problems, the present invention provides the following:
In a combined power generation system, there is a heat pump device that collects and pumps industrial waste heat or heat m of geothermal water, a heat storage device that stores the body in high-temperature heat storage whose temperature level is raised by the heat pump device, and a heat storage device that stores the heat amount from this heat storage device. It is equipped with a power generation device that converts energy into electric power.

Effect: According to such a means, by operating the heat pump device, the heat amount can be recovered from the environmental heat amount, pumped up, and constantly stored in the heat storage device, so that heat storage amount can be transferred to the power generation device connected to the heat storage device. Optionally, the energy can be converted into electrical power by supplying it.

EXAMPLES Hereinafter, examples according to the present invention will be described in detail with reference to FIGS. 1 and 2.

According to the present invention, the first embodiment shown in FIG. 1 is equipped with a heat pump device l for recovering and pumping an appropriate amount of heat from environmental heat sinking, eg, industrial waste heat or geothermal heat (water). ing. In this heat pump device,
2 is the intake of environmental heat (amount), 3 is the outlet, 4 is the first
Heating pipe, 5 is an evaporator, 6 is a main pipe, 7 is a compressor,
8 is a motor (?II motor), 9 is a condenser, and IO is an expansion valve.

A heat storage device 11 is provided that stores a high-temperature heat storage body, such as water, chemicals (liquid, gas), etc., whose temperature level is raised by the heat pump device 1 .

In this heat storage device, 12 is a high temperature tank, 13 is a low temperature tank,
14 is a first transfer pipe for the heat storage body, 15 is a low temperature pump, 16 is a high temperature pump, and 17 is a second transfer pipe for the heat storage body.

Further, a power generation device that converts the environmental heat from the heat storage device into electric power, that is, an organic Rankine cycle power generation device 18 as a first embodiment is provided. In the power generation device 18, 19 is a second heating pipe connected to the middle of the first heating pipe 4 on the heat pump device l side, 20 is a preheater, and 21 is the main pipe, 22 is the evaporator, 23 is the (organic medium) turbine,
24 is a generator, 25 is a condenser, 26 is a cooling water pipe, 27 is a cooling water intake, 28 is a drain port, and 29 is a liquid supply pump.

Furthermore, in the second embodiment shown in FIG. 2, the heat pump device 1 and the heat storage device 11 are the same as those shown in the first embodiment, except for some of the components and piping. This power generation device and the heat storage device 11 are connected via a flash device 31 provided in the middle of the second transfer pipe 17, that is, a first flasher 32 and a second flasher 33.

As mentioned above, the difference from the first embodiment is that first, in the heat pump device l, the second heating pipe 19 connected to the first heating pipe is abolished, and second, in the heat storage device 11. has been changed to the upper pump 34 of the high temperature tank 12.

On the other hand, in the flash device 31, a main pipe 21 is provided between the first and second flashers 32, 33, and a drain pump 34 is further provided downstream of the second flasher.

Further, in the turbine generator 30, 35 is a (Furanoyu steam) turbine, 24 is a generator, 36 is a condenser, 3
7 is a condensate pump, 26 is a cooling water pipe, 27 is a cooling water intake port, and 28 is a drain port.

With the above configuration, as a first step, the heat pump device 1 is driven at night.

First, in the first embodiment (see Fig. 1), as a heat source, environmental heat (amount) such as industrial waste heat or geothermal heat (water) is used directly as a gas or liquid (or other heat medium is connected to a pipe 6). The heat is recovered by the working fluid, such as an organic medium, passing through the chamber.
The snore is discharged outside the system through the snore outlet 3 of the heating tube 4.

Therefore, by receiving low floor surplus power at night and driving the motor 8, the compressor 7 directly connected to the motor pumps the working fluid (steam) which has become high temperature in the evaporator 5 as described above. Compress. The compression work of the compressor causes the working fluid to be discharged into the condenser 9, while the cryogenic pump I5 installed in the middle of the first transfer pipe 14 connected to the condenser 9 pumps the heat storage material stored in the cryogenic tank 13. pass.

As a result, the working fluid releases its retained heat (environmental heat) while being cooled by the low-temperature, low-heat heat storage body. The heat storage body, which has received heat and has become high in temperature, is stored in the high temperature tank 12 through the first transfer pipe 14, and stores the environmental heat.

Then, the working fluid (liquid) that has transferred the amount of heat passes through the main pipe 6 and returns to the evaporator 5 after appropriately lowering its pressure and flow rate at the expansion valve 10.

In this way, the heat pump device 1 completes one cycle (system) by collecting and pumping environmental heat.

During the daytime, this heat pump will be operated.

This power generation device 18 has a second power generator on the side of the preheater 20 as a main heat source.
Through the heating pipe 19, the environmental heat intake port 2 on the first heating pipe 4 side
Takes in environmental heat from At the same time, in the preheater 20,
The organic medium passing through the main pipe 21 recovers the environmental heat. In addition, the environmental heat medium that has completed transferring the heat amount passes through the second heating pipe 19, passes through the discharge port 3 of the first heating pipe 4, and is discarded to the outside of the system.

Furthermore, the organic medium evaporated in the preheater 20 is transferred to the evaporator 2.
At the same time, the high temperature tank 12 is introduced into the high temperature tank 12 by the high temperature pump 16 installed in the middle of the second transfer pipe 17 connected to this evaporator.
A heat storage element that was stored during the night as an auxiliary heat source is passed through.

As a result, the organic medium receives and absorbs the amount of heat (environmental heat) while being superheated by the high-temperature heat storage body.

Further, the heat storage body that has been given a heat amount to be lowered in temperature and heat I7 is returned to the low temperature tank → through the second transfer pipe 17.

After such heat exchange, the organic medium is introduced into the turbine S23, and its expansion work drives a generator 24 directly connected to this turbine to generate electric power.

The organic medium that has completed this expansion work and released heat is introduced into the condenser 25, and is cooled and liquefied by the cooling water taken in from the cooling water intake port 27 of the cooling water pipe 26 connected to the condenser. do. Note that the cooling water is disposed of outside the system through the outlet 28 of the cooling water pipe 26.

After that, the organic medium that has been liquefied and has a low temperature and low heat is used to appropriately increase its pressure and flow rate using the liquid supply pump 29, and then is returned to the preheater 20. Similarly, environmental heat is stored in the high temperature tank 12 of the heat storage device 11 by the heat pump device 1 during the night.

During the daytime, the heat pump device is stopped or activated as appropriate, and the turbine power generation device 30 is operated via the flash device 31.

In the case of this power generation device 30, instead of exchanging heat from the heat storage body to the organic medium as in the first embodiment, the heat storage body stored in the heat storage device 11 as described above is used as the main heat source. .

In other words, an appropriate amount of the heat storage body is introduced into the first flasher 32, and is evaporated (flashed) in the first flasher, and high-temperature steam is taken out and sent to the turbine 35 via the main pipe 21. The expansion work drives the generator 8 directly connected to this turbine to generate electric power.

In this case, the heat storage body in the first flasher 32 is not completely evaporated and is in a two-phase state of gas phase and liquid, and among these, the heat storage body that remains in the vessel and is still hot is transferred to the second flasher 32. Introduced in 33, it also returns the flash to green.

On the other hand, the heat storage body that has completed its expansion work in the turbine 35 and released heat is introduced into the condenser 36, and the cooling water taken in from the cooling water intake port 27 of the cooling water pipe 26 connected to this condenser is introduced into the condenser 36. It liquefies. Note that the cooling water is disposed of outside the system through a discharge port 28.

Thereafter, the heat storage body, which has been liquefied and has become low temperature and low heat, is returned to the low temperature tank 13 after appropriately increasing its pressure and flow rate using the condensate pump 37. At the same time, most of the heat storage body in the second flasher 33 evaporates and is introduced into the low pressure side (midway) of the turbine 35, similar to the action in the first flasher, and is reheated during the expansion process. let And that is the first
After it has expanded together with the flash steam from the flattener 32 side, it is introduced into the condenser 36. Even after such a process, the low-temperature, low-heat heat storage body that remains in the second flasher 33, in other words, the drain, is returned to the low-temperature bath 13 by the drain pump 34 via the second transfer pipe 17.
- Finishing the journey of the cycle. Note that a circulation pump 33 is installed to recirculate the heat storage body from the low temperature tank 13 to the high temperature tank 12.
It's loud to use.

In this way, it is possible to form power generation devices such as those of the first and second embodiments.

Next, the relationship between the driving power and the coefficient of performance during operation of the heat pump device l (at night) will be explained.

The driving power for operating this heat pump device, that is, the power to the motor 8 for (driving) the compressor 7, is added as heat to the environmental heat such as industrial waste heat and geothermal heat pumped up by the pump, so the heat storage bond that is pumped up is is multiplied by the coefficient of performance (COPh) of the heat pump device 1. In other words, the heat pump is used for the work of compressing the working fluid, and the working fluid receives the amount of heat corresponding to the work to form a cycle. Therefore, the heat of condensation released by the working fluid in the condenser 9 is equal to the environmental heat recovered in the evaporator 5 and the amount of heat equivalent to the amount of work applied to the working fluid in the compressor 7.
(heat amount converted to 860 kcal per kwh), and C0Ph is usually about 2.5 to 4 times the value.

i.e. 2.5-4K using IKN night power
Since heat equivalent to W can be obtained, it can be seen that this is an effective means for both energy saving and economic efficiency.

As described above, by appropriately supplying the high temperature and high pressure heat storage body sufficiently stored in the heat storage device 11 to the power generation device 18 or 30, efficient organic Rankine cycle power generation (first embodiment) or (flash steam) Turbine power generation (second embodiment) can be performed respectively.

In these cases, at least the pumped storage i! A utilization efficiency of about 60 to 70% (not shown) can be ensured.

However, in the former organic Rankine cycle power generation,
It goes without saying that the main heat source of the after-sound turbine power generation is the environmental heat from the preheater 20, compared to only the environmental heat from the flash device 31, and the auxiliary heat source is simultaneously supplied as heat storage from the evaporator 22. Nor. Therefore, if the environmental heat is continuously used in parallel during this power generation operation,
The output (output energy) when extracting electric power can be further increased, and the utilization efficiency can be 80 to 90%, which is a value that exceeds pumped storage power generation.

Effects of the Invention As detailed above, according to the present invention, by combining a heat pump device and an organic Rankine cycle power generation device or a (flash steam) turbine power generation device, no matter which power generation device is used, the installation point It” This can be done at any location where there is a heat source such as industrial waste heat or geothermal heat (water), so it has a greater degree of freedom than pumped storage power generation currently in practical use, and can also sufficiently increase utilization efficiency.

Furthermore, since low power at night is effectively used to operate the heat pump device, energy saving and economical efficiency can be improved.

In addition, the high-temperature environmental heat stored in the heat storage device can be efficiently taken in either as a main heat source or as an auxiliary heat source, thereby making it possible to sufficiently cover power generation operations during peak load times during the day. be able to. Then, the power load difference between day and night can be effectively alleviated and equalized.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an example of a combined power generator according to the present invention, and FIG. 2 is a system diagram showing another example. 1... Heat pump device, 11... Heat storage device, 18...
Organic Rankine cycle power generation device, 30... (flash steam) turbine power generation device, 31...Flash (and 1 other person)

Claims (1)

[Claims] A heat pump device that recovers and pumps the heat of industrial waste heat or geothermal water, a heat storage device that stores a high-temperature heat storage body whose temperature level has been raised by the heat pump device, and a power generation device that converts the heat from this heat storage device into electricity. A combined power generation device comprising: