JPH0330562Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a marine power generator using a low boiling point medium,
In particular, it relates to improving the followability of power generation to load fluctuations.

[Conventional technology]

In recent years, with the rise in energy costs, various efforts have been made to save energy on ships. Among these, highly efficient propulsion engines have been developed. However, as a result, the temperature of the exhaust gas discharged from the main engine tends to decrease. For this reason, there are expectations for power generation devices that use a medium with a low boiling point in order to recover waste heat at medium to low temperatures.

Figure 2 is a system diagram showing the configuration of a conventional marine power generator using a low-boiling point medium. Economizer that reheats heated liquid using exhaust gas from the main engine, 3
4 is a flasher that evaporates the liquid heated by the economizer 2 to produce high-pressure steam; 4 is a steam turbine that guides the high-pressure steam supplied from the flasher 3 to a high-pressure stage and converts the thermal energy of the high-pressure steam into rotational work; 5 is a steam turbine that It is a rotating generator.

6 is a sensor that detects the steam flow rate between the flasher 3 and the high pressure stage of the steam turbine 4; 7 is the sensor 6;
8 is a vacuum condenser that condenses low-pressure steam flowing out from the steam turbine 4, and 9 is a water supply pump.

In a marine power generation system that uses a low boiling point medium, the low boiling point medium is expensive, so in order to minimize the amount of low boiling point medium used, the main engine cooling system 1, economizer 2, flasher 3, steam A once-through type system consisting of a turbine 4, a vacuum condenser 8, and a water supply pump 9 is employed.

In this once-through type marine power generator, the amount of incoming steam supplied to the steam turbine 4 is controlled by adjusting the opening of a damper valve 7 using a sensor 6 .

[Problem that the invention attempts to solve]

Generally, in the case of a water boiler that has a boiler drum as a steam supply source, even if a sudden sudden power load change occurs and the steam pressure in the boiler drum decreases, steam is generated by boiling at the same time. The steam sent to the steam turbine can follow the changes in the electric power load, and the amount of power generated can also follow the fluctuations in the electric power load.

However, in the above-mentioned once-through type marine power generator that does not have a boiler drum, when the power load fluctuates and the power consumption increases, the damper valve 7 is closed and the entire amount of steam generated in the flasher 3 is transferred to the steam turbine 4. However, since the flow rate passing through the flasher 3 is limited, there is a problem that power generation cannot follow sudden sudden power load fluctuations.

This idea was made in order to solve such problems, and the purpose is to propose a marine power generation device using a low boiling point medium that can cope with temporary load fluctuations.

[Means for solving problems]

A marine power generation device using a low boiling point medium according to this invention includes a main engine cooling device that heats a low boiling point liquid, an economizer connected to the main engine cooling device and reheating the heated liquid using main engine exhaust gas, and the economizer. A once-through type marine vessel comprising: a flusher connected to the flusher to evaporate heated liquid; a steam turbine having a high-pressure stage connected to the steam outlet of the flusher; and a condenser and water pump connected between the steam turbine outlet and the main engine cooling system. In the power generation device, a liquid circulation circuit connects the liquid outlet of the main engine cooling device and the inlet of the water supply pump via a solenoid valve, and connects the liquid outlet of the main engine cooling device and the low pressure stage of the steam turbine via a solenoid valve and a flusher. The present invention is characterized by comprising: a connected low-pressure steam supply circuit; and pressure detection means connected to the high-pressure stage of the steam turbine and outputting a switching signal for the electromagnetic valves of the liquid circulation circuit and the low-pressure steam supply circuit.

[Effect]

This idea uses a liquid circulation circuit to increase the flow rate that circulates through the main engine cooling system, making effective use of the waste heat from the main engine cooling system. By evaporating the high-temperature liquid in the circulation circuit and supplying it to the steam turbine, the ability to follow fluctuations in the amount of power generation is improved.

〔Example〕

FIG. 1 is a system diagram showing the configuration of an embodiment of this invention. In the diagram, numerals 1 to 9 are the same as those in the conventional example shown in FIG. 2 above. 10 is a solenoid valve 12 provided in a liquid circulation circuit 11 connecting the liquid outlet of the main engine cooling device 1 and the inlet of the water supply pump 9;
14 is a solenoid valve provided in the low-pressure steam supply circuit 13 connecting the liquid outlet of the main engine cooling device 1 and the low-pressure stage of the steam turbine 4, 14 is a pressure reducing valve provided after the solenoid valve 12, and 15 is a pressure reducing valve 14. The auxiliary flasher 16 provided at the rear stage is a pressure switch attached to the high pressure stage inlet of the steam turbine 4.

In the marine power generator configured as above,
During steady state, a part of the low boiling point solution heated by the main engine cooling device 1 is sent to the economizer 2 and reheated. Other solutions are sent to the liquid circulation circuit 11 via the electromagnetic valve 10 and returned to the main engine cooling device 1 by the water supply pump 9, thereby effectively utilizing the waste heat of the main engine cooling device 1.

The solution reheated in the economizer 2 is evaporated into steam in the flasher 3, and some of the steam is bypassed via the damper valve 7, and the remaining steam is sent to the high pressure stage of the steam turbine 4 to drive the generator 5. . Normally, the amount of steam flowing into the steam turbine 4 is controlled by adjusting the opening of the damper valve 7 using a sensor 6. When the damper valve 7 closes due to a change in the power load, the amount of steam generated in the flasher 3 is controlled. The entire amount flows into the steam turbine 4.

However, if the power load fluctuations are large and the amount of steam is insufficient under the control using the damper valve 7,
The pressure switch 16 detects a drop in steam pressure at the high-pressure stage inlet of the steam turbine 4, closes the solenoid valve 10 of the liquid circulation circuit 11, opens the solenoid valve 12 of the low-pressure steam supply circuit 13, and closes the liquid circulation circuit 11. The circulating high temperature solution is made to flow into the low pressure steam supply circuit 13.

The high temperature solution flowing into the low pressure steam supply circuit 13 flows into the auxiliary flusher 15 through the pressure reducing valve 14 and becomes saturated steam. This saturated steam is supplied to the low pressure stage of the steam turbine 4 to make up for the lack of steam.

When the electric power load returns to the normal state, the pressure switch 16 detects the normality of the steam pressure flowing into the high pressure stage of the steam turbine 4, closes the solenoid valve 12, and closes the solenoid valve 1.
0 to return to the normal state. Therefore, even if sudden power load fluctuations occur, the amount of power generated by the generator 5 can be made to follow the load fluctuations.

[Effect of idea]

As explained above, this invention aims to increase the amount of liquid circulating through the main engine cooling device using the liquid circulation circuit, so that the waste heat of the main engine cooling device can be effectively utilized. Furthermore, in the event of a sudden change in power load, the high temperature liquid circulating in the liquid circulation circuit is evaporated and supplied to the steam turbine.
The ability to follow load fluctuations of a power generation device using a low boiling point solution can be improved with a simple configuration, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of an embodiment of this invention, and FIG. 2 is a system diagram showing the configuration of a conventional device. 1...Main engine cooling system, 2...Economizer, 3
...Flushier, 4 ... Steam turbine, 5 ... Generator, 8 ... Vacuum condenser, 9 ... Water supply pump, 10, 12 ... Solenoid valve, 11 ... Liquid circulation circuit, 13 ... Low pressure steam supply circuit , 15... Auxiliary flasher, 16... Pressure switch.

Claims (1)

[Claims for Utility Model Registration] A main engine cooling device that heats a low boiling point liquid, an economizer connected to the main engine cooling device that reheats the heated liquid using main engine exhaust gas, and an economizer connected to the economizer that evaporates the heated liquid. In a once-through type marine power generation system, the main engine cooling system is provided with a once-through type marine power generating apparatus comprising: a flusher for causing the air to flow; a steam turbine having a high-pressure stage connected to the steam outlet of the flasher; and a condenser and a feed water pump connected between the steam turbine outlet and the main engine cooling system. a liquid circulation circuit that connects the liquid outlet of the main engine cooling device and the water supply pump inlet via a solenoid valve; and a low-pressure steam supply circuit that connects the liquid outlet of the main engine cooling device and the low-pressure stage of the steam turbine via a solenoid valve and a flusher. , A marine power generation device using a low boiling point medium, characterized in that it is equipped with pressure detection means connected to the high pressure stage of the steam turbine and outputting a switching signal for the electromagnetic valve of the liquid circulation circuit and the low pressure steam supply circuit. .