JPS603489A - Power generation device - Google Patents

Abstract

PURPOSE:To make it possible to operate a Rankine cycle engine for producing power with no use of a pressure-booster pump, by providing an accumulator and a valve device between a condenser and a vapor generator in a Rankine cycle system so that working medium is circulated. CONSTITUTION:When liquid in a vapor generator 3 gradually decreases so that the level of the liquid becomes lower than a predetermined liquid level, a float valve 23 opens, and therefore, the vapor generator 3 and an accumulator 21 are pressure-equalized together under the action of a pressure equalizer 22 so that both are set at the same pressure. At this time, since the accumulator 21 is positioned above the vapor generator 3, liquid in the accumulator 21 flows through a pipe line 9J and a check valve 8 under gravitational action, and then returns to the vapor evaporator 3 through a pipe line 9K. When the liquid returns into the vapor generator 3, the float valve 23 in closed so that the original condition is recovered. With this arrangement, the working fluid may be circulated to operate a Rankine cycle engine for power generation with no use of a pressure booster pump.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to increasing the pressure of a working fluid in a Rankine cycle engine driven by solar heat, various types of waste heat, or the like.

BACKGROUND ART In recent years, there has been a strong desire for effective use of energy, and various devices have been developed in response to this, one of which is a Rankine cycle engine using solar heat.

FIG. 1 is a diagram showing an example of a solar heat generating Rankine cycle engine system that has been commonly used in the past. In the figure, 1 is a pyrothermal pump for circulating a heat medium for collecting solar heat, 2 is a heat shield, and 3 is for generating steam by exchanging the collected solar heat with the working fluid of the Rankine cycle. 4 is an expander, 5 is a load, 6 is a condenser, 7 is a boost pump, and 8 is a check valve, and these are connected in a closed loop by piping. In other words, the pipe 9a is between the heat collector pump 1 and the heat collector 2, the pipe 9b is between the heat collector 2 and the steam generator 3, the pipe 9C is between the f-air generator 3 and the heat collector pump 1, and the pipe 9C is used to generate steam. A pipe 9d is connected between the expander 3 and the expander 4, a pipe 9e is connected between the expander 4 and the condenser 6, a pipe 9f is connected between the condenser 6 and the boost pump 7, and a pipe 9g is connected between the boost pump 7 and the check valve 8. The check valve 8 and the steam generator 3 are connected to each other by a pipe 9h.

In the device configured in this way, solar heat is collected by the prefecture heater 2 by driving the heat collecting pump 1 and sent to the steam generator 3. The steam generator 3 evaporates the pressurized working fluid in a liquid state sent by the boost pump 7 to generate high-temperature, high-pressure steam close to the heat collection temperature.

High-temperature, high-pressure steam produced by the steam generator 3 flows into the expander 4 and is adiabatically expanded to a low pressure, generating shaft power corresponding to the enthalpy difference accompanying the expansion and driving the load 5. . The expanded low-pressure steam flows into the condenser 6, where it is cooled and liquefied, and then sucked into the boost pump 7. The reverse J-to-valve 8 functions to prevent backflow of working fluid when the boost pump 7 is stopped. In this way, the Rankine cycle engine (・
can convert thermal energy into mechanical energy.

However, because the conventional power generation device using a Rankine cycle engine is configured as described above, a boosting pump is required to circulate the working fluid, which not only requires electric power. Since it is conceivable that the boost pump may cause cavity collapse and malfunction, it is necessary to maintain a relatively high degree of supercooling of the working fluid sucked into the boost pump. Furthermore, since it is a rotating mechanical part, it has low reliability and requires two maintenance inspections.

Therefore, this invention was made to eliminate the above-mentioned conventional drawbacks, and by providing an accumulator and a valve device between the condenser and the steam generator, power is generated by a Rankine cycle engine that eliminates the need for a boost pump. The purpose is to provide equipment. It is something. Hereinafter, the power generation device according to the present invention will be explained in detail using the drawings.

FIG. 2 is a circuit diagram showing an embodiment of the power generating device according to the present invention, and the same parts as in FIG. 1 are indicated using the same symbols. In the same figure, 21 is an accumulator provided between the condenser 6 and the check valve 8, and is located above the steam generator 3. Condenser 6 and accumulator 21 are connected by piping 91 and accumulator 2
1 and the check valve 8 are connected by a pipe 9j, and the check valve 8 and the steam generator 3 are connected by a pipe 9k.

Further, the upper part of the steam generator 3 and the accumulator 21 are connected by a pressure equalizing pipe 22, and there is a part in the middle of the pressure equalizing pipe 22 that is connected to the upper part of the accumulator 21. A float valve 23 which is opened is provided. Further, 24 indicates a working fluid of the Rankine cycle.

In the device configured in this way, the working fluid 24 that has evaporated into steam in the steam generator 3 is expanded in the expander 4, and as it expands, it generates tx, a shaft power equal to half the enthalpy difference, and 9 The action of pivoting the load 5 is the same as in the conventional example, so a description thereof will be omitted.

At this time, the working fluid 24 that has become a liquid condensed in the condenser 6
flows into the accumulator 21 through the piping 91, or because the pressure of the steam generator 3 is higher than the pressure of the accumulator 21, the check valve 8 is in the "closed" state, and the working fluid 24 in the accumulator 21 is It is stored in the accumulator 21 without returning to the steam generator 3.

This operation continues while the liquid in the steam generator 3 is higher than a predetermined liquid level.

When the liquid in the steam generator 3 gradually decreases and becomes lower than a predetermined liquid level, the float valve 23 is opened, and the pressure of the steam generator 3, Acyuno, and Rake 21 is equalized by the action of the pressure equalizing pipe 220. The pressure will be the same. At this time, accumulator 21
Since it is located above the steam generator 3, the liquid in the accumulator 21 passes through the piping 9j and the check valve 8 and returns to the steam generator 3 from the piping 9k due to the action of gravity. When the liquid flows back into the steam generator 3, the float valve 23 closes and returns to its original state.

Through the above operations, the working fluid is circulated, and the Rankine cycle engine is operated using the booster pump, thereby making it possible to generate power.

In the above embodiment, an embodiment in which solar heat is used has been described, but it goes without saying that this can also be used in a Rankine cycle system that uses other heat sources such as exhaust heat. Further, in the embodiment, a case is shown in which a float valve is provided to detect the liquid level of the steam generator, but the same effect can be obtained even if another valve device having an equivalent function is provided.

As described above, according to the power generation device according to the present invention, since the accumulator valve device is provided between the condenser and the steam generator of the sink-recycle system, an external pressure pump is not required. Since this does not occur, it is possible to obtain a power generation device using a Rankine cycle engine that has high @axial property and does not require power for a booster pump.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a power generation device using a conventional solar heat generating Rankine cycle engine, and FIG. 2 is a block diagram showing a power generation device using a Rankine cycle engine β1 according to an embodiment of the present invention. l... Heat collection pump, 2... Hayabusa heater, 3... Steam generator, 4... Expander, 5... Load, 6... Condenser, 7... Boost pump , 8゛°° check valve, 9... Piping, 21... Accumulator, 22... Pressure equalization pipe, 23
...Float valve, 24°/working fluid. In the drawings, the same reference numerals indicate the same or half parts. Agent: Masuo Oiwa (2 others) 2WJ Procedural Amendment (Voluntary) Attorney: 1, Office Director's Palace 1, Indication of the case: Patent Application No. 58-112198 2, Name of Invention Power Generation Apparatus 3, Representative Hitoshi Katayama of the person making the amendment Section 5, Subject of amendment (1) Detailed description of the invention in the specification column 6゜Contents of amendment (1) Lines 14-15 of page 2 of the specification ``8 is a check valve, and these are connected in a closed loop by the subordinates. In other words,'' is corrected to ``8 is a check valve.'' (2) On page 7, line 9, the phrase "accumulator valve device" is amended to read "accumulator and valve device."

Claims (1)

[Claims] The working fluid is evaporated by the steam generator installed on the high-temperature heat source side, and the steam is led to the expander and expanded to extract power, and then liquefied in the condenser, and this liquefied working fluid is sent back to the steam generator. In the Rankine cycle system, in which the steam is fed into the steam generator to achieve a closed loop, the accumulator is located in the middle of the piping between the condenser and the steam generator and above the steam generator, and a check valve is installed between the accumulator and the steam generator. The steam generator is interposed, and the upper part of the steam generator and the upper part of the accumulator are connected by a pressure equalizing pipe, and a valve system is provided in the middle of the pipe that opens only when the liquid level in the steam generator drops below a certain level. Power generation device using Rankine cycle system.