WO2021117969A1 - Combined power and desalination system using unused heat - Google Patents

Abstract

The present invention relates to a combined power and desalination system using unused heat and, more specifically, to a combined power and desalination system using unused heat, wherein surface ocean water, thermal effluents from power plants, and solar heat are used as an evaporation heat source to evaporate seawater by an evaporator, steam generated therefrom is used to produce power through a turbine-generator, and the steam discharged after used for the power production is produced into desalinated water through heat exchange with LNG.

Description

Power generation and desalination complex system using unutilized heat

The present invention uses sea surface water, hot water from a power plant, solar heat, etc. to evaporate moisture in seawater under reduced pressure in an evaporator, operate a turbine using the vaporized vapor under reduced pressure to generate electricity, and also convert the water vapor discharged from the turbine into LNG in a condenser. It relates to a power generation-fresh water complex system using unutilized heat that enables the production of fresh water by condensing it using cold heat.

In ocean temperature differential power generation, the pressure difference between the inlet and outlet of the turbine in the conventional temperature differential power generation system is at the level of evaporation and condensing pressure due to the low temperature difference between surface water and deep water, and since it is a cycle with only simple basic components, the power generation efficiency is different from other power generation methods. low level compared to

Low system efficiency in offshore temperature difference power generation system means that the scale of each component and the entire system to obtain a specific amount of power increases. In particular, the high initial investment cost of component equipment is one of the factors hindering the commercialization of the ocean temperature difference power generation system. .

Therefore, the development of various systems is emerging so as to improve system utilization efficiency and increase economic benefits through a complex system configuration that can produce various results in one system.

[Prior art literature]

[Patent Literature]

Republic of Korea Patent Publication No. 10-1110695 (Registered on Jan. 20, 2012)

The present invention has been devised to solve the above problems, and an object of the present invention is to produce electric power using seawater and unutilized heat, and also to produce fresh water using LNG as a power generation- freshwater complex system, Seawater is evaporated in an evaporator using surface water, hot water from a power plant, and solar heat, and electric power is produced by a turbine-generator with the water vapor generated from the seawater. An object of the present invention is to provide a power generation-fresh water complex system using unused heat that is condensed while exchanging heat with vaporization heat to produce fresh water.

Other objects and advantages of the present invention will be set forth below and will be learned by way of example of the present invention. Further, the objects and advantages of the present invention may be realized by means and combinations indicated in the claims.

The present invention is a means for solving the above problems,

a heat source unit 10 for supplying a heat source; an evaporator 20 for evaporating seawater flowing into and discharged from the inside, receiving an evaporation heat source from the heat source unit 10, and evaporating the seawater flowing into the evaporator 20 under reduced pressure to form water vapor; a turbine-generator 30 for generating electric power using the steam evaporated under reduced pressure of the evaporator 20; a condenser 40 through which the steam passing through the turbine-generator 30 passes, receiving cooling heat used in the LNG terminal 50, and condensing the steam into a liquid phase to produce and discharge fresh water; It is characterized in that it comprises a.

As described above, the present invention has the effect of simultaneously producing power generation and fresh water using seawater and unutilized heat.

In addition, the present invention supplies LNG to the place of use after vaporization at the LNG terminal, and at this time, as seawater is used as heat of vaporization, marine environmental problems (such as problems with cold drainage in the surrounding sea area) caused by the discharge of seawater having a lower temperature are prevented. It works.

In addition, the present invention has the effect of being able to produce fresh water without separate deep sea water intake in terms of the complex system, and reducing the problem of cold drainage in terms of LNG.

1 is a configuration diagram of an embodiment showing a power generation using unutilized heat according to the present invention - desalination complex system.

<Indication of Symbols for Main Parts of Drawings>

10: heat source

20: evaporator

30: turbine-generator

40: condenser

50: LNG terminal

Before describing various embodiments of the present invention in detail, it is to be understood that the application is not limited to the details of the construction and arrangement of components described in the following detailed description or shown in the drawings. The invention is capable of being embodied and practiced in other embodiments and of being carried out in various ways. Also, device or element orientation (eg "front", "back", "up", "down", "top", "bottom") The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are used merely to simplify the description of the invention, and the associated apparatus Or it will be appreciated that it does not simply indicate or imply that an element must have a particular orientation. Also, terms such as “first” and “second” are used in this application and the appended claims for the purpose of description and are not intended to indicate or imply relative importance or spirit.

In order to achieve the above object, the present invention has the following features.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

Looking at an embodiment according to the present invention is as follows.

a heat source unit 10 for supplying a heat source; an evaporator 20 for evaporating seawater flowing into and discharged from the inside, receiving an evaporation heat source from the heat source unit 10, and evaporating the seawater flowing into the evaporator 20 under reduced pressure to form water vapor; a turbine-generator 30 for generating electric power using the steam evaporated under reduced pressure of the evaporator 20; a condenser 40 through which the steam passing through the turbine-generator 30 passes, receiving cooling heat used in the LNG terminal 50, and condensing the steam into a liquid phase to produce and discharge fresh water; It is characterized in that it comprises a.

In addition, the heat source unit 10 is characterized in that any one or two or more of sea surface water, solar heat, and power plant hot water is used as an evaporation heat source.

In addition, LNG itself is used as the cooling and heating furnace of the LNG terminal 50, and when the LNG is used as cooling heat, the steam exchanges heat with the LNG cooling heat and vaporizes the heat of vaporization required for use by vaporizing from a liquid phase to a gas phase. It is characterized in that it is made available from

Hereinafter, with reference to FIG. 1, a power generation using unutilized heat according to a preferred embodiment of the present invention-desalination complex system will be described in detail.

Power generation using unutilized heat according to the present invention - the fresh water composite system includes a heat source unit 10, an evaporator 20, a turbine-generator 30, and a condenser 40.

The heat source part 10 is a part for supplying a heat source to the evaporator 20 to be described later, and any one or two or more of sea surface water, solar heat, and power plant hot wastewater may be used as an evaporation heat source in combination.

This is, when evaporating moisture in the seawater supplied to the evaporator 20 to be described later, if the supplied heat source is high, more water vapor can be produced, and for this purpose, renewable energy such as hot water from a power plant or solar heat is used as an evaporator without using fossil energy. (20) is used as a heat source, so as to induce the evaporation of moisture in the seawater in the evaporator (20).

The evaporator 20 is a part of the evaporator 20, the seawater flows in and discharged therein, receives the evaporative heat source from the heat source unit 10, evaporates the seawater flowing into the evaporator 20 under reduced pressure to form water vapor.

At this time, most of the incoming seawater is discharged to the sea (discharged water), and a part becomes steam and is supplied to the turbine-generator 30 to be described later.

The turbine-generator 30 is a part that generates electric power by using the steam evaporated under reduced pressure of the evaporator 20 .

The condenser 40 passes through the above-described turbine-generator 30 and is a part through which steam discharged after operating the turbine-generator 30 passes, and receives the cooling heat used in the LNG terminal 50 to convert the steam It is a part that condenses into a liquid phase to produce fresh water and discharge it.

In such a condenser 40, fresh water can be obtained by condensing water vapor in deep sea water at a temperature of usually 5 ° C. or less, but economic development of the system is hindered due to an increase in cost due to the intake of deep sea water, and when sea water is used as heat of vaporization, after vaporization The discharged seawater may have an impact on the marine environment due to the problem of cold drainage in the area where it is discharged due to a drop in temperature.

Accordingly, in the present invention, in addition to deep sea water of 5° C. or less, LNG itself may be used. When the LNG is used as cooling heat, water vapor exchanges heat with the LNG cold heat and vaporizes the vaporization heat required when using it by vaporizing it from a liquid phase to a gas phase. It is used from steam.

As a result, in the condenser 40 of the power generation-freshwater combined system using unutilized heat of the present invention, by exchanging the steam discharged from the turbine-generator 30 with the heat of vaporization of LNG, in terms of the combined system, fresh water is obtained without separate deep sea water intake. In terms of LNG, it will be possible to reduce the problem of cold drainage.

1, the system configuration of the present invention will be described as follows.

In order to evaporate moisture in the seawater flowing into the evaporator (20, ①), the sea surface water (②) is supplied to the evaporator 20, but hot water from a power plant or solar heat (③) is available to secure a higher heat source.

A predetermined amount of a heat source is circulated to the evaporator 20 by a circulating water pump and used as an evaporation heat source of the evaporator 20 .

In the evaporator 20, water in the seawater is evaporated under reduced pressure by an evaporation heat source to become water vapor, and then flows into the turbine-generator 30 (④) to produce electric power.

The steam (⑤) discharged after operation of the turbine-generator 30 is supplied to the condenser 40, (⑥), and the liquid LNG is supplied from the condenser 40 (⑦), and the heat of vaporization when the liquid is vaporized into a gaseous phase (⑦) is supplied from the steam discharged from the turbine.

Thereafter, the LNG is vaporized, and the water vapor is condensed into a liquid phase to produce fresh water (⑧).

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and changes are possible within the scope of equivalents of the claims to be described.

Claims (3)

1. a heat source unit 10 for supplying a heat source;

   an evaporator 20 for evaporating seawater flowing into and discharged from the inside, receiving an evaporation heat source from the heat source unit 10, and evaporating the seawater flowing into the evaporator 20 under reduced pressure to form water vapor;

   a turbine-generator 30 for generating electric power using the steam evaporated under reduced pressure of the evaporator 20;

   a condenser 40 through which the steam passing through the turbine-generator 30 passes, receiving cooling heat used in the LNG terminal 50, and condensing the steam into a liquid phase to produce and discharge fresh water;

   Power generation using unutilized heat, characterized in that it comprises a - freshwater complex system.
2. The method of claim 1,

   The heat source 10 is

   A power generation-fresh water complex system using unused heat, characterized in that any one or two or more of sea surface water, solar heat, and hot wastewater from a power plant are used as an evaporation heat source.
3. 3. The method of claim 1 or 2,

   The cooling furnace of the LNG terminal 50

   LNG itself is used,

   When the LNG is used as cold heat, water vapor exchanges heat with LNG cold heat, and vaporizes from the liquid phase to the gas phase so that the heat of vaporization required for use can be used from the steam.

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