JPS5925004A - Steam power plant - Google Patents

Abstract

PURPOSE:To secure daily-use water and power source for ships etc. and use spaces effectively in said ships etc. by providing in the steam power plant system, means of separating sea water into gaseous and liquid phases, i.e., steam and concentrated sea water by flushing said sea water which is heated as a liquid phase. CONSTITUTION:Sea water 1 is introduced through a sea-water feed pump 11 into a condenser 12 and a heat exchanger 13, and is sent under pressurization to a heater 14 to be heated up to a certain temp. as in liquid phase. The heated sea water is flushed through a reducing vlave 16 and separated into gaseous and liquid phases of steam and concentrated sea water through a vapor liquid separator 17. Operating an expander 18 for the separated steam, the discharged steam is concentrated in the condenser 12 and then used as daily-use water. The steam and concentrated sea water introduced into the vapor liquid separator 17 provide smooth recovery of energy thereafter through cushioning action of the vapor liquid separator 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam power station used in ships and the like.

BACKGROUND ART Conventionally, in steam power stations where boilers, steam turbines, etc. of ships and the like are installed, where fresh water cannot be easily obtained, water machines such as multi-effect cans are installed to extract fresh water from seawater. That is, as shown in FIG. 1, seawater 1 is introduced into a water dispenser 2, fresh water is collected, and concentrated seawater 3 is discarded. The fresh water sampled above is introduced into the receiver 5 as water for the boiler, and a considerable portion is used as water 4 for daily use such as drinking water.The fresh water in the receiver 5 is fed to the boiler 7 by the boiler pump 6. It is pumped to generate steam. This steam drives a steam turbine 8 that powers a generator, etc., is then cooled and condensed by seawater in a condenser 9, is returned to the liquid receiver 5, and is again sent to the boiler 7 by the boiler pump 6@as described above. Boiler water is circulated ◎Also, a gas-liquid multiphase flow occurs inside the tubes of the boiler, which corrodes the inner surface of the boiler tubes, but a can cleaning agent is usually added to prevent this corrosion. Therefore, boiler circulating water cannot be used for other purposes. The amount of circulating water in the boiler decreases due to extraction from the drain separator 10 of the boiler 7, partial one-pass heating, etc., but fresh water from the water dispenser 2 is replenished to keep the water amount constant. The can cleaning agent is also replenished so that the concentration remains constant.

By the way, in the ships mentioned above where space is limited,
It is important to reduce the space taken up by equipment;
Various efforts have been made to reduce equipment space.

In view of the above circumstances, it is an object of the present invention to provide a steam power station system that does not require a water generator such as a multi-effect can. Then, this is flashed through a pressure reducing valve to separate it into steam and concentrated seawater into a gas phase and a liquid phase, and after driving an expander with the steam, the discharged steam is condensed in a condenser to recover fresh water. This is what I did.

The present invention will be explained below with reference to the drawings.

FIG. 2 shows an embodiment of a steam power station according to the present invention. First, seawater 1 is introduced into a condenser 12 by a seawater supply pump 11, and exhaust steam from an expander, which will be described later, is condensed and the seawater is preheated.Then, this water is passed through a heat exchanger 1.
3, and further preheated to a high temperature using high-temperature, high-pressure concentrated seawater, which will be described later.

This preheated seawater is forced into the heater 14 and heated to a predetermined temperature while maintaining the liquid phase. The heated seawater passes through a check valve 15 and is flushed by a pressure reducing valve 16 to reduce its pressure to a predetermined value, and is then introduced into a gas-liquid separator 17 where it is separated into vapor and concentrated seawater into a gas-liquid phase. Most of this separated steam is led to and drives the expander 18, and the discharged steam is condensed in the condenser 12i and used as water 4 for daily use such as drinking. Note that a part of the steam from the gas-liquid separator 17 may be used for heating or other purposes.

On the other hand, the gas-liquid separated high-temperature, high-pressure condensed seawater is transferred to the heat exchanger 13 (where the seawater is further preheated).

This high-pressure concentrated seawater whose temperature has been lowered by preheating is
The sea water is guided to a pressure reducing machine (for example, a water turbine) 19 that recovers pressure energy, and the pressure energy held therein is recovered and becomes low pressure, which is then disposed of as waste concentrated seawater 3.

Next, the operation of the steam power station according to the present invention configured as above will be explained.

Seawater 1 is first sent through a condenser 12 and a heat exchanger 13 by a feed pump 11 . During this period, the thermal energy of steam and seawater is collected by preheating the seawater. Therefore steam and concentrated tUJ
It is possible to sufficiently recover the thermal energy held by water. In addition, since the seawater in the heater 14 is in a liquid phase, unlike a gas-liquid multiphase flow, corrosion of the heating pipe is less likely to occur.
It is less than G multiphase flow. In addition, the condensed water in the condenser 12 can be used once as daily water 4. The steam and condensed seawater are flushed by the pressure reducing valve 16 and introduced into the gas-liquid separator 17. Effect I
This allows subsequent energy recovery operations to be carried out smoothly. In particular, recovery of the pressure energy possessed by the commercially concentrated seawater from which thermal energy has been recovered is due to the cushioning effect of the gas-liquid separator 17.

The steam power station described above is designed to effectively recover the generated heat and pressure energy within the steam power station. 17, expander 18, and condenser 12
If necessary, the energy recovery I may be separately Jν to effectively recover energy.

As mentioned above, the steam power station according to the present invention can secure daily water and a power source without installing a water generator, so it is extremely suitable as a steam power station where space is limited such as ships. It can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional steam power station, and FIG. 2 is a diagram showing an embodiment of the steam power station according to the present invention. l...Seawater, 2...Water generator, 3...
...Waste concentrated seawater, 4...Water for daily use, 5...
...Liquid receiver, 6...Boiler pump, 7.
...boiler, 8 ... steam turbine, 9 ... condenser, 10 ... drain separator, 11 ... seawater supply pump, 12・・・・・・
... Condenser, 13 ... Heat exchanger, 14 ...
...Heater, 15...Check valve, 16'...
...Pressure reducing valve, 17... Gas-liquid separator, 18...
...expander, 19...pressure reducer.

Claims (1)

[Claims] It is driven by a heater that heats the pumped seawater to a predetermined temperature, a pressure reducing valve that flashes the heated day-pressure seawater, a gas-liquid separator that separates the flashed seawater into steam and concentrated seawater, and the steam that has been separated into gas and liquid. A steam power station equipped with an expander and a condenser that condenses water vapor discharged from the expander.