JPH0454205A - Power generation and refrigeration combined cycle device - Google Patents

Abstract

PURPOSE:To save the floor area and the cost of installation and avoid duplication of equipment and devices by constituting both working mediums common to both power generation cycle and refrigerating cycle to flow through both cycles with each other. CONSTITUTION:Working medium, cooling water 8, a cooling water pump 10 and a cooling tower 11 are commonly used, and a motor-generator 19 is coupled to a turbine 5 and a compressor 15 through the intermediary of clutches 20a, 20b. In addition, there are provided medium pipe lines 21a, 21b by which the systems of mediums 3a, 3b for a power generation cycle and a refrigerating cycle are coupled with each other. During operation of the electric power generation cycle, the clutch 20a is engaged while the clutch 20b is released, the motor-driven generator 19 is turned into the condition of a generator 6. The cooling water 8 is circulated through the cooling tower 11, a cooling water selector 22a, a condenser 7a and the cooling tower 11 in that order. Meanwhile, upon operation of the refrigerating cycle, the clutch 20a is released while the clutch 20b is engaged so that the motor-driven power generator 19 serves as a motor 14 so as to drive the compressor 15. The cooling water 8 is circulated through the cooling tower 11, a cooling water selector switch 22a, a condenser 7a and the cooling tower 11 in that order.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to power generation using medium- and low-temperature heat sources and cold generation using surplus electricity at night.

(Conventional technology) As a method of obtaining motive power and electric power using medium- to low-temperature heat such as geothermal heat and industrial waste heat, low-boiling organic media such as fluorocarbons and volatile hydrocarbons are evaporated using this heat. There is a technology that uses its evaporation to drive a prime mover, such as an organic medium turbine.

In addition, surplus electricity at night is used to generate cold energy using an electric refrigerator, and this cold energy is stored.

There is a technology used for daytime cooling.

To explain the outline of the conventional technology with reference to FIG. 8, a medium/low temperature heat source fluid 1 such as geothermal heat or industrial waste heat is heated and evaporated by a low boiling point working medium 3a in an evaporator 2a, and then transferred to a preheater. 4, the working medium 3a is preheated and discharged outside the plant system. The working medium 3a in a liquid state is heated to near the evaporation temperature in the preheater 4, and then evaporated in the evaporator@2a to become a high-energy medium vapor.

This medium steam is guided to the turbine 5 to drive the turbine 5, and a generator 6 coupled to the turbine 5 generates electric power. The medium vapor whose pressure and temperature have been lowered by giving energy to the turbine 5 enters the condenser 7a, is cooled by the cooling water 8a, condenses, and returns to a liquid state, and then is sent to the preheater 4 again by the medium pump 9, and this Cycle through the system. The cooling water 8a whose temperature has increased due to cooling the medium vapor is sent to the cooling tower 11a by the cooling water pump 10a, cooled by air, and circulated to the condenser 7a. A medium pump outlet valve 25 is provided at the outlet of the medium pump 9, and a main steam stop valve 26 is provided at the inlet of the turbine 5.

On the other hand, the vapor of the working medium 3b, also called refrigerant.

It is cooled and condensed by the cooling water 8b in the condenser 7b, and after being depressurized in the expansion mechanism 12, it is evaporated in the evaporator 2b, taking away the heat of vaporization from the cooling medium I3, and becomes a low-temperature, low-pressure medium vapor. This low-temperature, low-pressure medium vapor is compressed by a compressor 15 driven by an electric motor 14, and circulated to the condenser 7b. The cooling water 8b that cools the medium vapor in the condenser 7b is sent to the cooling tower 11b by the cooling water pump IOb, cooled by air, and circulated to the condenser 7b.

The cold medium 13 cooled by the condenser 7b cools the heat storage material in the heat storage tank 17 by the cold medium circulation pump 16, and cold heat is stored there. This cold energy is given to the cold water 18 and the like as needed, and used for air conditioning and the like.

There are various other accessories, but those that are not directly related to the description of the present invention are omitted from illustration.

In this way, with conventional technology, both the power generation and refrigeration cycles require many similar devices.

Each was composed individually.

(Plot M to be solved by the invention) The purpose of the present invention is to avoid duplication of equipment when installing equipment for both a power generation cycle and a refrigeration cycle using a low-boiling organic medium as a working medium. The aim is to provide equipment that can save installation space, equipment costs, etc.

[Structure of the invention]

(Means for Solving Problem 11) In the present invention, the above object is achieved by allowing the power generation cycle and the refrigeration cycle to share common equipment.

(Function) Since the condensation temperatures of the working media 3a and 3b in the condensers 7a and 7b are almost the same in the power generation cycle and the refrigeration cycle,
It is conceivable to share both working media 3a and 3b. Also, condensers 7a and 7b, and a cooling water pump 10a.

10b, cooling tower 11a, and llb may be shared.

Furthermore, the generator 6 and the electric motor 14, and the turbine 5 and the compressor 15 may be shared.

(Example) An embodiment of the present invention is shown in FIG.

In this embodiment, 1 working medium 3. Cooling water8. Cooling water pump 1
0, a motor generator I9 that shares the cooling tower II and has the functions of both a generator 6 and an electric motor 14, a clutch 20a,
It is coupled to turbine 5 and compressor 15 via 20b. In addition, a medium communication pipe 21a that connects the working media 3a and 3b systems of the power generation cycle and the refrigeration cycle;
21b is provided.

When operating the power generation cycle in this example,
The clutch 20a is engaged, the clutch 20b is disengaged, and the motor/generator I9 is set as the generator 6 to generate electricity. The cooling water system opens the cooling water switching valve 22a and closes the cooling water switching valve 22b, and the cooling water 8 is supplied to the cooling tower 11. Cooling water? Fup 10° Cooling water switching valve 2
2a, condenser 7a, and cooling tower 11 in this order.

When operating the refrigeration cycle in a state where it is desired to generate cold heat rather than electric power, the crack 20a is released.
b is a coupling, and the motor-generator 19 drives the compressor 15 as the motor 14. In the cooling water system, the cooling water switching valve 22a is closed and the cooling water switching valve 22b is opened, and the cooling water 8 is supplied to the cooling tower 11° and the cooling water pump 10. Cooling water switching valve 22b, condenser 7a.

The cooling tower 11 is circulated in this order.

If necessary, it is also possible to connect both clutches 20a and 20b to utilize the entire system and directly drive the compressor 15 with the power generated in the power generation cycle to operate the refrigeration cycle. In this case, if the output of the turbine 5 and the input of the compressor 15 are equal, the motor generator 19 will be in an idling state, and if there is a difference, it will generate an electric power output equal to the difference or consume electric input.

The medium communication pipes 21a and 21b are used to adjust the amount of working medium held in both cycles, and when it is desired to increase the amount held in the refrigeration cycle, the medium communication valve 23a is opened and the medium pump 9 is used to pump the medium. Transfer the liquid to the refrigeration cycle side. Conversely, if it is desired to increase the amount held in the power generation cycle, the medium connection valve 23b is opened and the compressor 15 transfers the medium vapor to the power generation cycle side.

The state of the medium during both cycles is shown in FIG.

FIG. 2 is a pressure (P)-enthalpy (i) diagram of the medium, and point A is the state where the medium is condensed in the condensers 7a and 7b and becomes a saturated liquid. In the power generation cycle, the medium is pressurized by the medium pump 9, becomes B, evaporates in the preheater 4, evaporator 2a to become C, expands in the turbine 5 to become D, condenses in the condenser 7a, and returns to A. In the refrigeration cycle, from the state A, the expansion mechanism 12 expands and reduces the pressure to E, and the evaporator 2b evaporates to F.
, the pressure is increased by the compressor 15 to G, which is condensed by the condenser 7b and returns to A.

In this way, by constructing a system in which the condensing pressure and therefore the condensing temperature of both cycles are set to the same value, it is possible to combine both cycles as in the present invention.

FIG. 3 shows a second embodiment. In this embodiment, a working medium 3, a condenser 7, a cooling water 8, a cooling water pump 10, a cooling tower 1
1 is shared. In this embodiment, when the power generation cycle is operated, the stop valves 24a and 24b are fully closed and the electric motor 14 is stopped, so that the refrigeration cycle is in a closed state. On the other hand, when operating the refrigeration cycle, the medium pump 9 is stopped, the medium pump outlet valve 25 and the main steam stop valve 26 are fully closed, and the stop valve 24a is closed.
, 24b are fully opened and the compressor 15 is driven by the electric motor 14. Simultaneous operation of both cycles is also possible, in which case the stop valves 24a, 2
The working medium 3a, 3b of the rain cycle is controlled by controlling the opening degree of 4b.
Operate while adjusting the flow rate.

FIG. 4 shows a third embodiment. In this embodiment, a working medium 3, a condenser 7, a cooling water 8, a cooling water pump 10, a cooling tower 1
1 is shared. Furthermore, the motor generator 19 having the functions of both the generator 6 and the electric motor 14 is connected to the clutch 20a,
It is coupled to turbine 5 and compressor 15 via 20b. In this embodiment, when operating the power generation cycle, the stop valves 24a and 24b are fully closed, and the clutch 20 is closed.
It is assumed that a is connected, 20b is released, and the motor generator 19 is in the state of the generator 6. When operating the refrigeration cycle,
Stop the medium pump 9.

The medium pump outlet valve 25 and the main steam stop valve 26 are fully closed, the stop valves 24a and 24b are fully opened, and the clutch 20a is released.
0b is a coupling, and the motor-generator 19 is in the state of the motor 14 and is implemented by driving the compressor 15.

Simultaneous operation of both cycles is also possible by engaging both clutches 20a and 20b, and in that case, the opening degrees of stop valves 24a and 24b are controlled to adjust the flow rates of working media 3a and 3b for both cycles. while driving.

If the output of the turbine 5 and the input of the compressor 15 are equal, the motor generator 19 is in an idling state, and if there is a difference, it generates an electrical output equal to the difference or consumes the electrical input.

FIG. 5 shows a fourth embodiment. In this embodiment, the working medium 3, the condenser 7. Cooling water 8, cooling water pump 10, cooling tower 1
1 is shared. Further, a turbine/compressor 27 having the functions of both the turbine 5 and the compressor 15, and a motor generator 19 having the functions of both the generator 6 and the electric motor 14 are provided.

In this embodiment, the state in which the power generation cycle is operated is set to the sixth state.
In this case, the good valve 24a is shown by the solid line in the figure.

By fully closing 24c, the refrigeration cycle becomes disconnected. Power is generated by making the turbine/compressor 27 function as the turbine 5 and the motor generator 19 function as the generator 6.

In this embodiment, the state in which the refrigeration cycle is operated is the seventh state.
Shown by the solid line in the figure. In this case, the medium pump outlet valve 25 and the main steam stop valve 26 are fully closed, thereby disconnecting the power generation cycle. and stop valve 24a, 2
4c is fully opened, the turbine/compressor 27 functions as the compressor 15, and the motor generator 19 functions as the electric motor 14, thereby generating cold heat in the evaporator 2b.

In the above example, a system having equipment for storing cold heat has been described. Although the present invention is effectively applied to such systems, it is equally applicable to systems that do not have cold/heat storage equipment.

Note that the capacities of the power generation cycle and the refrigeration cycle do not need to be the same.

〔Effect of the invention〕

According to the present invention, the power generation cycle and the refrigeration cycle, which use a low boiling point organic medium as a working medium, share common equipment, thereby avoiding duplication of equipment and reducing plant installation area and equipment costs. etc. can be saved.

[Brief explanation of drawings]

Fig. 1 is a system diagram of the first embodiment of the combined power generation/refrigeration cycle device according to the present invention, Fig. 2 is a pressure-enthalpy diagram showing the state of the working medium in the power generation/refrigeration surface cycle, and Fig. 3 is a diagram showing the state of the working medium in the power generation/refrigeration surface cycle. The system diagram of the second embodiment of the present invention, FIG. 4 is the system diagram of the third embodiment of the present invention.
Fig. 5 is a system diagram of the fourth embodiment of the present invention, Fig. 6 is a diagram showing the state in which the power generation cycle is operated in the fourth embodiment, and Fig. 7 is a system diagram of the fourth embodiment of the present invention. A diagram showing a state in which the refrigeration cycle is operating in the fourth embodiment,
FIG. 8 is a system diagram of the prior art. l... Heat source fluid 2.2a, 2b... Evaporator 3, 3a, 3b... Working medium 4... Preheater 5... Turbine 6... Generator 7, 7a,
7b-Condenser 8.8a, 8b-Cooling water 9...
Medium pump 10, IOa, 10b・=cooling pump 11, ll
a, Ilb...Cooling tower 12...Expansion mechanism 13.
...Cold heat medium 14...Electric motor 15...Compressor 16...Cold heat medium circulation pump 17...Heat storage tank 18...Cold water 19...
- Motor generator 20...Clutch 21...Medium communication pipes 22a, 22b...Cooling water switching valve 23...Medium communication valve 24a, 24b, 24cm stop valve 25...Medium pump outlet valve 26. ...Main steam stop valve 27...Turbine/compressor agent Patent attorney Noriyuki Chika Diagram Diagram Diagram Diagram

Claims (4)

[Claims] (1) It has an evaporator, prime mover, condenser, medium pump, and generator for the power generation cycle, and an evaporator, compressor, condenser, expansion mechanism, and electric motor for the refrigeration cycle, and the working medium is common to both cycles. A power generation/refrigeration combined cycle device characterized by a fused flow of water within both cycles. (2) It has an evaporator, a prime mover, a condenser, and a medium pump for the power generation cycle, and an evaporator, a compressor, a condenser, and an expansion mechanism for the refrigeration cycle, and the prime mover and the compressor are connected to each other via a clutch. A power generation/refrigeration combined cycle device comprising a motor/generator coupled to each other, wherein a working medium common to the two cycles flows integrally in both cycles. (3) The power generation/refrigeration combined cycle device according to claim 1 or 2, wherein the evaporator or condenser is used for both a power generation cycle and a refrigeration cycle. (4) The prime mover and compressor are a dual-purpose turbine/compressor, and the generator and electric motor are a dual-purpose motor/generator, and during power generation cycle operation, the turbine/compressor functions as a turbine and a motor/generator. each functions as a generator, and during refrigeration cycle operation, the above turbines and
2. The power generation/refrigeration combined cycle device according to claim 1, wherein the compressor is configured to function as a compressor, and the motor generator is configured to function as an electric motor.