JPS62223579A - Heat pump system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat pump system, and in particular to a technique for improving the performance, particularly the coefficient of performance, of a large heat pump system during temperature rise.

[Prior art]

Previously, in order to effectively utilize the energy contained in the condensate drawn out from the condenser, the present inventor expanded the condensate under reduced pressure (flash) and used the generated steam to drive a turbine, thereby driving the compressor of a heat pump. We proposed a technology to recover it as part of the power.

The present invention further develops this technology. It is a well-known fact that as the temperature increases by a heat pump, the degree of superheating of compressed steam increases, and a condenser with a larger heat transfer area per heat transfer amount is required.

Furthermore, since the optimum expansion pressure of the condensate is approximately constant depending on the condensation pressure, if the amount of condensate can be increased, the recovery power of the turbine will increase, and the efficiency of the system will increase.

[Purpose of the invention]

An object of the present invention is to increase the amount of steam generated in the throttling mechanism by increasing the amount of condensate, thereby increasing the recovery power of the steam turbine, thereby increasing the performance of the heat pump, particularly the coefficient of performance. Furthermore, by reducing the degree of superheating of the vapor compressed by the compressor, there is also the effect of reducing the heat transfer area of the condenser.

[Structure of the invention]

The heat pump system of the present invention, which can achieve the above object, is a heat pump system consisting of an evaporator, a compressor, a condenser, a throttling mechanism, a gas-liquid separation mechanism, an expansion turbine, and a condenser. By spraying the liquid drawn out from the gas-liquid separation mechanism into the post-cooler, exchanging heat with the vapor, cooling the evaporated vapor, and cooling the vapor to near the saturation temperature. ,
It is characterized by increasing the amount of medium vapor flowing from the condenser to the gas-liquid separator, thereby increasing the output of the expansion turbine by increasing the amount of steam generated from the gas-liquid separator.

〔Example〕

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

FIG. 1 is a system diagram of the heat pump system according to the present invention, in which the heat medium supplied from the pipe 12 to the evaporator 11 absorbs heat from the heat exchanger 13 of the evaporator 11 and becomes steam S1, and the heat medium is supplied to the evaporator 11 from the pipe 14. The air is introduced into the first stage compressor 15 via the air. Here, it is compressed into high-temperature, high-pressure steam S2, which is further introduced into the second stage compressor 17 via the pipe 16. Here, it is compressed into high-temperature, high-pressure steam, that is, superheated steam S3, and is further supplied to an aftercooler 37 disposed in the middle of the pipe 18. This aftercooler 37 has a nozzle 38, and a liquid heat medium sprayed from the nozzle 38 cools the superheated steam S until it reaches a saturated state. Saturated steam S4 is supplied to condenser 19 via piping 18. Since the heat medium sprayed from the nozzle 38 also turns into steam, the amount of steam introduced into the condenser 19 increases. This will contribute to an increase in the output of the turbine on the second day, which will be described later. As the output of the turbine 28 increases, the compression ratio of the first stage compressor 15 improves, so it becomes possible to reduce the power of the motor 40 that drives the second compressor 17.

Saturated steam S4 through the heat exchanger 20 in the condenser 19
of thermal energy is supplied to the high temperature heat source, and the saturated steam S4 is condensed. The heat medium condensed and liquefied in the condenser 19 is expanded in an expansion valve 22 as a throttling mechanism via a pipe 21, and separated into liquid L1 and steam S in a Franch tank 23 as a gas-liquid separator. be done.

The liquid L1 is pressurized by a pump 35 via a pipe 34, and is supplied to a nozzle 37 in the aftercooler via a pipe 36.

On the other hand, the steam S passes through the pipe 24 to the first stage compression a15.
is introduced into a steam turbine 28 for driving the . As the amount of heat medium condensed in the condenser 19 increases, the amount of frudge steam increases, contributing to an increase in the output of the turbine 28. Since the compression ratio of the first stage compressor 15 improves as the output of the turbine 28 increases, it becomes possible to reduce the power of the motor 40 that drives the second stage compressor 17. Steam S derived from steam turbine 2nd,
is sent to the condenser 30 via the pipe 29, where it is condensed to become a low-temperature liquid L2. Then, the pressure is increased by a pump 32 via a pipe 31, and the water is circulated and supplied to the evaporator 11 via pipes 33 and 12.

A pipe 39 branched from the pipe 34 is connected to the pipe 12, and part of the liquid L1 is mixed with the liquid L2 and circulated to the evaporator 11.

FIG. 2 is a Moliere diagram of the heat pump system according to the present invention, and the locations indicated by the symbols in FIG. 2 indicate the conditions at the locations indicated by the same symbols in FIG.

〔Effect of the invention〕

As described above, the present invention provides a heat pump system comprising an evaporator, a compressor, a condenser, a throttling mechanism, a gas-liquid separation mechanism, an expansion turbine, and a condenser, in which steam compressed by a compressor is transferred to a post-cooler. The liquid drawn out from the gas-liquid separation mechanism is sprayed into the aftercooler, heat exchanged with the vapor, and the evaporated vapor is cooled to a temperature close to the saturation temperature, thereby forming a condenser. The output of the expansion turbine was increased by increasing the amount of medium steam from the gas-liquid separator to the gas-liquid separator, and as a result, the output of the expansion turbine was increased by increasing the amount of steam generated from the gas-liquid separator.
By increasing the amount of steam generated in the throttling mechanism and increasing the recovery power of the steam turbine, it is possible to improve the performance of the heat pump, especially the coefficient of performance. Furthermore, by reducing the degree of superheating of the vapor compressed by the compressor, there is also the effect of reducing the heat transfer area of the condenser.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a heat pump system according to the present invention, and FIG. 2 is a Molière diagram of the heat pump system according to the present invention. 11...Evaporator, 15.17...Compressor, 19...
- Condenser, 22... Throttle mechanism, 23... Gas-liquid separator, 2nd... Turbine, 37... Aftercooler. Figure 2

Claims (1)

[Claims] In a heat pump system consisting of an evaporator, a compressor, a condenser, a throttle mechanism, a gas-liquid separation mechanism, an expansion turbine, and a condenser, steam compressed by the compressor is guided to a post-cooler and then extracted from the gas-liquid separation mechanism. The amount of medium vapor from the condenser to the gas-liquid separator is reduced by spraying the liquid to the post-cooler, exchanging heat with the vapor, cooling the evaporated vapor, and cooling the vapor to near the saturation temperature. 1. A heat pump system characterized in that the output of an expansion turbine is increased by increasing the amount of steam generated from a gas-liquid separator.