阅读说明：本技术 耦合地热的lng冷能再热发电系统及方法 (Geothermal-coupling LNG cold energy reheating power generation system and method ) 是由 张文祥 袁晓旭 邓国梁 刘勐 郭勇 张小波 魏小龙 杨佐卫 周帅 宋放放 李志明 于 2019-10-10 设计创作，主要内容包括：本发明涉及能源系统领域,旨在解决现有的LNG冷能发电系统的循环效率较低的问题,提供一种耦合地热的LNG冷能再热发电系统及方法,其包括依次串联的冷凝器、升压泵、蒸发器、第一透平、再热器和第二透平,且第二透平连通冷凝器,以形成工质循环通道；所述第一透平和所述第二透平的输出端分别连接第一发电机和第二发电机,用于发电；所述冷凝器具有LNG进口和LNG出口,用于通过用作工质的冷源的LNG；所述蒸发器具有地热水进口和地热水出口,用于通过用于加热工质的地热水；所述再热器具有地热水进口和地热水出口,用于通过用于加热工质的地热水。本发明的有益效果是系统循环效率较高,且受自然气候影响小。(The invention relates to the field of energy systems, aims to solve the problem of low cycle efficiency of the existing LNG cold energy power generation system, and provides a geothermal-coupled LNG cold energy reheating power generation system and a geothermal-coupled LNG cold energy reheating power generation method, wherein the geothermal-coupled LNG cold energy reheating power generation system comprises a condenser, a booster pump, an evaporator, a first turbine, a reheater and a second turbine which are sequentially connected in series, and the second turbine is communicated with the condenser to form a working medium cycle channel; the output ends of the first turbine and the second turbine are respectively connected with a first generator and a second generator for generating electricity; the condenser is provided with an LNG inlet and an LNG outlet and is used for passing LNG used as a cold source of the working medium; the evaporator is provided with a geothermal water inlet and a geothermal water outlet and is used for passing geothermal water used for heating working media; the reheater has a geothermal water inlet and a geothermal water outlet for passing geothermal water for heating the working medium. The invention has the advantages of high system circulation efficiency and small influence of natural climate.)

1. The utility model provides a geothermal coupling's LNG cold energy reheat power generation system which characterized in that:

the system comprises a condenser, a booster pump, an evaporator, a first turbine, a reheater and a second turbine which are sequentially connected in series, wherein the second turbine is communicated with the condenser to form a working medium circulation channel; the output ends of the first turbine and the second turbine are respectively connected with a first generator and a second generator for generating electricity; the condenser is provided with an LNG inlet and an LNG outlet and is used for passing LNG used as a cold source of the working medium; the evaporator is provided with a geothermal water inlet and a geothermal water outlet and is used for passing geothermal water used for heating working media; the reheater has a geothermal water inlet and a geothermal water outlet for passing geothermal water for heating the working medium.

2. A geothermal-coupled LNG cold energy reheat power generation system as claimed in claim 1 wherein:

the geothermal water outlet of the evaporator is communicated with the geothermal water inlet of the reheater to form a geothermal water channel in series.

3. A geothermal-coupled LNG cold energy reheating power generation method is characterized by comprising the following steps:

boosting the organic working medium to working pressure by a booster pump;

the organic working medium enters an evaporator and is heated and evaporated to high-temperature gas by geothermal water;

the organic working medium enters a first turbine to expand and do work and drive a first generator to generate electricity;

organic working media enter a reheater to be reheated;

the organic working medium enters a second turbine to expand and do work and drive a second generator to generate electricity;

the organic working medium enters a condenser and is cooled into liquid by LNG;

and the organic working medium enters a booster pump to complete circulation.

4. A geothermal-coupled LNG cold energy reheat power generation method as claimed in claim 3, wherein:

the reheater has a geothermal water inlet and a geothermal water outlet to pass geothermal water as its heat source.

5. A geothermal-coupled LNG cold energy reheating power generation method according to claim 4, wherein:

the reheater geothermal water inlet is communicated with the geothermal water outlet of the evaporator to form a geothermal water channel connected in series.

Technical Field

The invention relates to the field of energy systems, in particular to a geothermal coupling LNG cold energy reheating power generation system and a geothermal coupling LNG cold energy reheating power generation method.

Background

For the convenience of natural gas transportation, natural gas is generally liquefied, and the electricity consumption of the LNG is about 850kW.h per liquefied 1t of the LNG under the normal pressure and the liquefaction temperature of the natural gas is-163 ℃. In the LNG receiving station and the LNG vaporizing station, LNG is generally vaporized by a vaporizer and then used, and a large amount of cold energy is discharged during vaporization, and the value thereof is about 830 kJ/kg. Usually, the part of cold energy is lost along with the seawater and the air in the natural gas gasifier, so that the energy is wasted, and considerable economic benefit and environmental protection benefit can be obtained by reasonably recycling the part of cold energy.

The conventional LNG cold energy power generation system is a circulating system which utilizes liquid natural gas as a cold source, seawater or river water as a heat source, adopts organic working medium Rankine cycle and utilizes low-grade heat energy in seawater to generate power. River water and seawater are used as high-temperature heat sources, although the specific heat capacity is large and the heat exchange efficiency is high, the seawater temperature is low, the temperature difference between the heat source and the cold source is small, and the circulation efficiency of the whole system is low.

Disclosure of Invention

The invention aims to provide a geothermal coupling LNG cold energy reheating power generation system and a geothermal coupling LNG cold energy reheating power generation method, so as to solve the technical problem.

The embodiment of the invention is realized by the following steps:

a geothermal-coupled LNG cold energy reheating power generation system comprises a condenser, a booster pump, an evaporator, a first turbine, a reheater and a second turbine which are sequentially connected in series, wherein the second turbine is communicated with the condenser to form a working medium circulation channel; the output ends of the first turbine and the second turbine are respectively connected with a first generator and a second generator for generating electricity; the condenser is provided with an LNG inlet and an LNG outlet and is used for passing LNG used as a cold source of the working medium; the evaporator is provided with a geothermal water inlet and a geothermal water outlet and is used for passing geothermal water used for heating working media; the reheater has a geothermal water inlet and a geothermal water outlet for passing geothermal water for heating the working medium.

When the geothermal-combined LNG cold energy reheating power generation system is used, organic working media are boosted by the booster pump, heated and evaporated by geothermal water in the evaporator, expanded by the first turbine to do work, and the first turbine drives the first power generator to generate power; the organic working medium which is expanded by the first turbine to do work is reheated by a reheater, the reheated gas is expanded by the second turbine to do work, and the second turbine drives a second generator to generate power; and the organic working medium which is expanded by the second turbine to do work enters a condenser, is condensed by LNG and then is sent to a booster pump for next circulation.

The scheme has the following beneficial technical effects:

(1) compared with the conventional LNG cold energy power generation, the system has the advantages that the temperature of the heat source is increased after geothermal water is adopted, the temperature difference between the heat source and the cold source is increased, and the circulation efficiency is improved.

(2) In the scheme, the reheater and the second turbine are additionally arranged, the gas after the first turbine does work is reheated and then participates in the work again, and the circulation efficiency is greatly improved.

(3) In the scheme, the geothermal water serving as the heat source has stable temperature, so that the whole system can run stably and is slightly influenced by natural environments such as winter and summer climate.

Optionally, the geothermal water outlet of the evaporator is communicated with the geothermal water inlet of the reheater to form a geothermal water channel in series.

The application also provides a geothermal coupling LNG cold energy reheating power generation method, which comprises the following steps:

boosting the organic working medium to working pressure by a booster pump;

the organic working medium enters an evaporator and is heated and evaporated to high-temperature gas by geothermal water;

the organic working medium enters a first turbine to expand and do work and drive a first generator to generate electricity;

organic working media enter a reheater to be reheated;

the organic working medium enters a second turbine to expand and do work and drive a second generator to generate electricity;

the organic working medium enters a condenser and is cooled into liquid by LNG;

and the organic working medium enters a booster pump to complete circulation.

Optionally, the reheater has a geothermal water inlet and a geothermal water outlet to pass geothermal water as its heat source.

Optionally, the reheater geothermal water inlet is communicated with the outlet of the geothermal water of the evaporator to form a geothermal water channel in series.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

FIG. 1 is a schematic diagram of a geothermal-coupled LNG cold energy reheat power generation system in an embodiment of the present invention;

fig. 2 is a schematic diagram of another embodiment of a geothermal-coupled LNG cold reheat power generation system in an example of the present invention.

Icon: 1-a condenser; 2-a booster pump; 3-an evaporator; 4-a first turbine; 5-a first generator; 6-a reheater; 7-a second turbine; 8-a second generator; 9-working medium circulation channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the terms are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.