JPS606008A - Power production engine - Google Patents

Abstract

PURPOSE:To enable power producing operation suitable to the load, by connecting a load detector and a heat source detector to an auxiliary heat source then operating the auxiliary heat source in accordance to the detected load and heat source temperature and controlling the cycle circulation. CONSTITUTION:When requiring an auxiliary heat source operation, an auxiliary heat source 9 is operated upon droppage of heat source temperature to bring it same with the target level thus to maintain the heat source temperature and perform circulation control. If the available maximum output at current operating point (B) is lower than the load (E), the auxiliary heat source 9 is operated to rise the heat source temperature such that the available maximum output will match with the load (E). Then the heat source temperature is brought same with the target level to maintain the heat source temperature and to set to the circulation control or the level indicating the available maximum output. Same control is performed when the load increases during operation of the auxiliary heat source. Consequently, operation suitable for the load can be performed for both variation of the heat source and the load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power generating engine, and particularly to a power generating engine suitable for recovering power from alternative energy such as solar heat or waste heat.

[Background of the invention]

Conventional power generating engines of this type include an expander and a condenser.

A liquid pump and a steam generator are operatively connected, and a load for absorbing power is connected to the expander, a cooling medium conveying means is connected to the condenser, and a high temperature medium conveying means is connected to the steam generator. If the temperature of the high temperature medium is lower than the set temperature,
The system uses an auxiliary heat source. However,
Conventional power generating engines have the disadvantage that when the load connected to the expander fluctuates, the output cannot be controlled in response to the load fluctuation.

[Purpose of the invention]

An object of the present invention is to eliminate all of the above-mentioned drawbacks and to provide a power generation engine that can perform power generation operation that is suitable for the load, even when both the heat source and the load change.

[Summary of the invention]

In order to achieve the above object, the present invention operatively connects an expander, a condenser, a liquid bonder, and a steam generator, and provides a load for absorbing all the power to the expander, and a cooling medium conveying means to the condenser. In a power generation engine in which an auxiliary heat source is connected to the steam generator via a high-temperature medium conveying means, a load detector is connected to the load, and the steam generator and the high-temperature medium conveying means are connected to each other. A heat source temperature detector is provided between them, both of the detectors are connected to the auxiliary heat source, the load and the heat source temperature are respectively detected by the two detectors, and all of the auxiliary heat sources are operated according to these detected values, The total cycle circulation amount is controlled.

[Embodiments of the invention]

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

In FIG. 11, 1 is an expander, and to this expander 1, a power conversion means 5 for converting the power obtained by the expander 1 into another type of power and a load 6 for absorbing the power are connected. There is. Reference numeral 2 denotes a condenser connected to the discharge side of the expander 1, and a heat exchange tube 2a connected to the cooling medium conveying means 8 is housed in the condenser 2. 3 is a liquid bonder connected to the condenser 2; 4 is a steam generator connected to the suction side of the liquid pump 3 and the expander 1; inside the steam generator 4 is a high temperature medium conveying means 7 and a high temperature medium for heating. A heat exchange tube 4a connected to the auxiliary heat source 9 is housed.

10 is a load detector connected to the load 6; 11 is a high temperature medium temperature sensor (hereinafter referred to as a heat source temperature sensor) provided between the steam generator 4 and the high temperature medium conveying means 7; 12 is a heat source temperature sensor 13 is a liquid pump 30 rotation speed controller, which is connected to the load detector 1 and calculates the maximum possible output corresponding to a certain heat source temperature.
0, a signal generator 14 which is connected to a computing unit 12 and an auxiliary heat source 9. This signal generator 14r/'i sends all start and stop signals to the auxiliary heat source 9.

Next, the characteristics and operation flow of this embodiment, which is constructed as described above, will be explained.

The relationship between power (maximum possible output at a certain heat source temperature) and circulation amount is shown in Figure 2 (aXb), and curves (c) and (f) show the characteristics when the heat source temperature is low, respectively. . From Figure 2, (i) the cycle efficiency and output are maximum at a certain circulation amount, (11) the higher the heat source temperature, the thicker the circulation amount that maximizes the output;
It can be seen that the magnitude relationship of 1D cycle efficiency is similar to the magnitude relationship of output.

In this embodiment, output control corresponding to load fluctuations is performed based on the above characteristics and according to the operation flow shown in FIG. 3. First, to explain the case when the auxiliary heat source 9 is not operating, the load detector 10 detects the load 20, the heat source temperature detector 11 detects the heat source temperature 21, and the heat (
The raw temperature detection 21 is input to the computing unit 12, and a maximum possible output calculation 22 is performed. Both the maximum possible output of the maximum possible output calculation 22 and the load of the load detection 2o are input to the rotation speed controller 13 and a comparison 23 is performed. In the case of the operating point A (FIG. 4) where 24 is not required, the circulation amount control 31 is performed by the rotation speed controller 13 to match the output full load.

On the other hand, when the auxiliary heat source operation 24 (f-) is required, the auxiliary heat source 9 is activated to make the heat source temperature equal to the target temperature 26, and the heat source temperature maintenance 27 is controlled by the circulation rate control 31. conduct.

Contrary to the above, if the maximum possible output at the current operating point (heat source temperature) B is smaller than the load E, as shown in FIG. The heat source temperature is increased 28 by heating the high temperature medium to the temperature (target temperature). Next, the heat source temperature is set equal to the target temperature 29, and the heat source temperature maintenance 30 is set to a value indicating the circulation amount control 31, that is, the maximum possible output.

Note that while the heat source temperature is rising, the circulation amount may be increased in accordance with a certain heat source temperature.

Furthermore, when the auxiliary heat source is activated, similar control is performed even when the load increases.

In order to maintain the full heat source temperature, if the load decreases while the auxiliary heat source 9 is operating, the current operating point C (maximum possible output) will change to the temperature (target temperature), the auxiliary heat source 9 until the heat source temperature decreases.
Then, the heat source temperature is maintained at the target temperature and the circulation amount is set to a value indicating the maximum possible output. If the heat source temperature does not decrease to the target temperature 1 even if the auxiliary heat source is stopped,
The circulation amount control shown in FIG. 4 is performed. Note that while the heat source temperature is decreasing, the cycle circulation amount may be set in accordance with the load, and then the cycle circulation amount may be increased in accordance with the decreasing heat source temperature.

When operating the auxiliary heat source to maintain the heat source temperature, in order to completely prevent hunting when the auxiliary heat source is activated, when the heat source temperature is ΔTC lower than the target heat source temperature, the auxiliary heat source is fully activated.

Conversely, when the heat source temperature is higher than the target heat source temperature by ΔTtZ', K may adopt a method of stopping the auxiliary heat source.

In addition, in order to control the circulation amount, a circulation control valve 15 is installed in the bypass path of the 7ffl pump 3 as shown in FIG.
- may be provided and the opening degree of the control valve 15 may be electrically controlled by the signal generator 16.

The signal generator 16 is connected to a negative pressure detector 10, a maximum possible output calculator 12 corresponding to a certain heat source temperature, and a signal generator 14 connected to an auxiliary heat source.

FIG. 8 shows the main system of the second embodiment of the present invention.
This embodiment differs from the first embodiment (Fig. 1) in that a cooling medium temperature sensor 17 is provided between the condenser 2 and the cooling medium conveying means 8, and the other configurations are the same, so drawings and explanations are omitted. did. Note that the same reference numerals in the figures as those in FIG. 1 indicate the same parts. In this second embodiment, the cycle circulation amount is determined by the temperature of the hot medium supplied to the condenser 2 and the load value.

Figure 9 shows the relationship between the coolant temperature and the output when other operating conditions are held constant in the second embodiment with the above configuration.As the coolant temperature decreases, the condensing pressure increases. decreases, and the differential pressure between the low pressure side and high pressure side of the cycle increases, so the output also increases. Therefore, the relationship between the output and the circulation amount using the coolant temperature as a parameter is shown in FIG. 10. That is, the curve (A.

B), (E, F), and (C, D) show the characteristics when the heat source temperature is changed when the cooling medium temperature is low, high, and intermediate, respectively. As is clear from this figure, when the coolant temperature decreases, the coolant moves upward, that is, the output increases, and when the coolant temperature rises, the coolant moves downward, that is, the output decreases. .

In the second embodiment described above, the maximum possible output is calculated by detecting the high temperature medium temperature and the cooling medium temperature, and from then on, the first embodiment
The same operation as in the embodiment, that is, each operation of the maximum possible output calculation 22 and below in the operation flow shown in FIG. 3 is performed sequentially. Such a second embodiment is effective when the coolant temperature fluctuates greatly during the period of use.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to perform all operations in accordance with the load, even when both the heat source and the load change.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a first embodiment of the power generating engine of the present invention, Figs. 2 and 3 are diagrams showing the characteristic diagram and operation flow of the same embodiment, and Figs. 4 to 6 are the same diagrams. A diagram showing the direction of change of the operating point with respect to load fluctuation in the embodiment, FIG. 7 is a system diagram when a bypass valve is used in the liquid pump, and FIG. 8 is a summary of the second embodiment of the power generation 1 front gate according to the present invention. The partial system diagram, FIGS. 9 and 10 are diagrams showing the relationship between the coolant temperature and the output in the second embodiment, and are characteristic diagrams of the power generating engine using the coolant temperature as a parameter. 2... Condenser, 3... Liquid pump, 4... Steam generator, 6... Load, 7... High temperature medium conveying means, 8...
- Cooling medium conveyance means, 9... Auxiliary heat source, lo... Load detector, 11... Heat source temperature detector, 12... Arithmetic unit, 13... Rotation speed controller, 17... Cooling Media temperature sensor. 3rd figure 1 figure 7th item n9 figure 12゛2-11 insect ()

Claims (1)

[Claims] 1. An expander, a condenser, a liquid bonder, and a steam generator are operatively connected, and a load for absorbing power to the expander is provided;
In the power generating engine, in which the condenser is connected to a cooling medium conveying means, and the steam generator is connected to an auxiliary heat source via a high m medium conveying means, a load #\i is connected to the load. , a heat source temperature detector is provided between the steam generator and the high-temperature medium conveying means, and both detectors are connected to the auxiliary heat source V, and both the detectors detect the load and heat source temperatures, respectively. A power generating engine characterized in that all auxiliary heat sources are activated in accordance with the detected value of , and the amount of cycle circulation is fully controlled. 2. A cooling medium temperature sensor is provided between the condenser and the cooling medium conveying means, and this temperature sensor is connected to an auxiliary heat source, and the auxiliary heat source is activated according to the cooling medium temperature detected by the temperature sensor. The power generating engine according to claim 1, characterized in that the power generating engine is configured to