阅读说明：本技术 一种基于单螺杆膨胀机的海水温差发电循环系统 (Seawater temperature difference power generation circulating system based on single-screw expander ) 是由 智瑞平 吴玉庭 刘致君 雷标 张灿灿 马丹丹 于 2019-10-23 设计创作，主要内容包括：一种基于单螺杆膨胀机的海水温差发电循环系统,属于海洋能源利用技术领域。主要包括温海水泵、蒸发器、预热器、回热器、分离器、单螺杆膨胀机、发电机、引射器、冷凝器、工质泵、冷海水泵。该系统采用低沸点工质,利用表层温海水作为热源,加热低沸点工质,推动单螺杆膨胀机做功,使发电机发电,利用深层冷海水作为冷源,冷却工质,完成连续发电。由于采用结构简单、振动小、噪音低的单螺杆膨胀机,改善了整个海水温差发电系统结构的紧凑性,并且提高了经济性。(A seawater temperature difference power generation circulating system based on a single-screw expander belongs to the technical field of ocean energy utilization. The system mainly comprises a warm sea water pump, an evaporator, a preheater, a heat regenerator, a separator, a single-screw expander, a generator, an ejector, a condenser, a working medium pump and a cold sea water pump. The system adopts a low-boiling point working medium, uses surface layer temperature seawater as a heat source to heat the low-boiling point working medium, pushes a single-screw expander to do work, enables a generator to generate electricity, and uses deep layer cold seawater as a cold source to cool the working medium, so as to finish continuous electricity generation. Due to the adoption of the single-screw expander which is simple in structure, small in vibration and low in noise, the compactness of the whole seawater temperature difference power generation system is improved, and the economy is improved.)

1. A seawater temperature difference power generation circulating system based on a single-screw expander is characterized by comprising a warm seawater circulating system, a power generation circulating system, an ejector circulating system and a cold seawater circulating system; the system mainly comprises a single-screw expander (1), a generator (2), an ejector (3), a condenser (4), a cold seawater pump (5), a working medium pump (6), a preheater (7), a heat regenerator (8), an evaporator (9), a warm seawater pump (10), a separator (11), a separator inlet (A), a separator first outlet (B), a separator second outlet (C), an ejector first inlet (d), an ejector second inlet (e) and an ejector outlet (f);

an outlet of the warm sea water pump (10) is communicated with a warm sea water inlet of the evaporator (9), a warm sea water outlet of the evaporator (9) is communicated with a warm sea water inlet of the preheater (7), and a warm sea water outlet flowing out of the preheater (7) is communicated with the sea to form a warm sea water circulating system;

an outlet of the working medium pump (6) is sequentially connected with inlets of the preheater (7), the heat regenerator (8), the evaporator (9) and the separator (11) through pipelines, a first outlet (B) of the separator (11) is sequentially connected with second inlets (e) of the single-screw expander (1) and the ejector (3), an outlet of the ejector (3) is connected with the condenser (4), the condenser (4) is finally connected with the working medium pump (6) to form a power generation circulating system, and working media are adopted in the circulation; the main shaft of the single-screw expander (1) is connected with the generator (2) so as to drive the generator (2) to generate electricity;

the condenser (4), the cold seawater pump (5) and a relatively cold ocean area are communicated to form a cold seawater circulating system, the cold seawater pump (5) conveys the cold seawater of the ocean into the condenser (4), a low-pressure low-temperature working medium f at the outlet of the condensing ejector (3) returns the cold seawater with the increased temperature from the condenser (4) to the ocean through a pipeline, and then the cold seawater is conveyed to the condenser (4) through the cold seawater pump (5) to complete cold seawater circulation;

a second outlet (C) of the secondary separator (11) is connected with a first inlet (d) of the heat regenerator (8) and the ejector (3);

the high-pressure working medium liquid flowing out of the separator (11) releases heat through the heat regenerator (8) and becomes high-pressure super-cooling working medium liquid d, and the high-pressure super-cooling working medium liquid d and the waste gas of the working medium e flowing out of the single-screw expander (1) jointly enter the ejector (3) to form an ejector circulating system.

2. A seawater temperature difference power generation cycle system based on a single screw expander as claimed in claim 1, wherein the warm water refers to the surface area of the ocean system where the temperature becomes high after absorbing the sunlight, and the cold water refers to the area of the ocean system where the temperature is relatively low.

3. The seawater temperature difference power generation circulating system based on the single-screw expander as claimed in claim 1, wherein the words for expressing the working medium are all different states of the working medium.

4. The seawater temperature difference power generation circulating system based on the single-screw expander as claimed in claim 1, wherein the single-screw expander (1) and the generator (2) are connected by a coupler at the same rotating speed, and a speed reducer is used between the single-screw expander and the generator at different rotating speeds.

5. The seawater temperature difference power generation circulating system based on the single-screw expander as claimed in claim 1, wherein the inlet and the outlet of the single-screw expander (1) are provided with valves.

6. A seawater temperature difference power generation circulating system based on a single screw expander as claimed in claim 1, wherein the circulating cold seawater circulating system is provided with valves at the inlet and outlet of the condenser (4).

7. A seawater temperature difference power generation circulation system based on single screw expander according to claim 1, wherein the corresponding inlet and outlet of the separator (11) are provided with valves.

8. The operation mode of the seawater temperature difference power generation circulating system based on the single-screw expander as claimed in any one of claims 1 to 7, wherein the warm seawater pump (10), the evaporator (9) and the preheater (7) are connected in sequence through a warm seawater pipeline; the separator (11), the single-screw expander (1), the ejector (3), the condenser (4), the working medium pump (6), the preheater (7), the heat regenerator (8) and the evaporator (9) are sequentially connected through a working medium pipeline; the separator (11), the heat regenerator (8) and the ejector (3) are sequentially connected through a working medium pipeline; the condenser (4) is connected with a cold seawater pump (5) through a cold seawater pipeline; the single screw expander (1) is connected with the generator (2) through a coupler;

the warm sea water is changed into high-pressure liquid through a warm sea water pump (10), flows into an evaporator (9) to heat working medium, then flows into a preheater (7), preheats the working medium in the preheater (7), and then flows into the ocean; high-temperature and high-pressure working medium from the evaporator (9) enters from an inlet (A) of the separator (11) for gas-liquid separation, and working medium gas from a first outlet (B) of the separator enters the single-screw expander (1) to push the expander to do work, so that the generator (2) is driven to work and electric energy is output; the working medium liquid from the second outlet (C) of the separator flows into the heat regenerator (8) to release heat and is changed into supercooled liquid; supercooled liquid enters an ejector through a first inlet (d) of the ejector, exhaust gas from the single-screw expansion machine (1) enters the ejector (3) through a second inlet (e) of the ejector, the exhaust gas and the exhaust gas are mixed in the ejector and then enter a condenser (4) through an outlet (f) of the ejector; the cold seawater is pressurized by a cold seawater pump (5) and then is conveyed into a condenser (4), and a working medium in the condenser (4) is cooled to be changed into a saturated liquid; saturated liquid from the condenser (4) is pressurized by the working medium pump (6) and then sequentially enters the preheater (7), the heat regenerator (8) and the evaporator (9) to become high-temperature and high-pressure working media, and circulation is completed.

Technical Field

The invention relates to a seawater temperature difference power generation circulating system based on a single-screw expander, and belongs to the technical field of ocean energy utilization.

Background

With the shortage of energy sourcesThe problem of environmental pollution is increasingly aggravated, and the development of clean energy power generation technology becomes an important component for promoting the sustainable and healthy development of economy in China. According to the report of international organization energy policy, the large amount of ocean energy resources in ocean is considerable, and the theoretical value is about 4 multiplied by 10¹⁰kW, practical exploitability of about 1X 10⁸kW, provided that can be with the energy that supplies human use such as electric energy with the ocean temperature difference energy conversion, various energy problems and the environmental problem that can effectively alleviate face.

The natural resource reserves of the south China sea and the affiliated islands are abundant, the development prospect is considerable, and the strategic position is very important. However, most islands are in shortage of energy and difficult in fresh water supply, and development, construction and utilization of the islands are severely restricted. Many sea island residents face the difficulties of lack of fresh water, power and vegetables. But the south China sea area has sufficient sunlight, large and stable temperature difference of the seawater, and good conditions for developing and utilizing ocean temperature difference energy. Therefore, the seawater temperature difference power generation circulating system based on the single-screw expander is provided for developing and utilizing temperature difference energy resources and providing power for the island, and has positive influence on the construction and development of the island, thereby having great significance for improving the energy utilization rate, increasing the economic benefit and protecting the environment.

Disclosure of Invention

The invention aims to design a power generation system for reliably recovering ocean temperature difference energy by using a single-screw expander. The system is shown in attached figure 1, and the system is mainly characterized in that the solar heat absorbed by seawater is utilized to generate electricity, so that the utilization of ocean temperature difference energy is realized.

The invention specifically adopts the following technical scheme:

a seawater temperature difference power generation circulating system based on a single-screw expander is divided into a warm seawater circulating system, a power generation circulating system, an ejector circulating system and a cold seawater circulating system; the system mainly comprises a single-screw expander (1), a generator (2), an ejector (3), a condenser (4), a cold seawater pump (5), a working medium pump (6), a preheater (7), a heat regenerator (8), an evaporator (9), a warm seawater pump (10), a separator (11), a separator inlet (A), a separator first outlet (B), a separator second outlet (C), an ejector first inlet (d), an ejector second inlet (e) and an ejector outlet (f).

An outlet of the warm sea water pump (10) is communicated with a warm sea water inlet of the evaporator (9), a warm sea water outlet of the evaporator (9) is communicated with a warm sea water inlet of the preheater (7), and a warm sea water outlet flowing out of the preheater (7) is communicated with the sea to form a warm sea water circulating system;

an outlet of the working medium pump (6) is sequentially connected with inlets of the preheater (7), the heat regenerator (8), the evaporator (9) and the separator (11) through pipelines, a first outlet (B) of the separator (11) is sequentially connected with second inlets (e) of the single-screw expander (1) and the ejector (3), an outlet of the ejector (3) is connected with the condenser (4), the condenser (4) is finally connected with the working medium pump (6) to form a power generation circulating system, and working media are adopted in the circulation; the main shaft of the single-screw expander (1) is connected with the generator (2) so as to drive the generator (2) to generate electricity;

the condenser (4), the cold seawater pump (5) and a relatively cold ocean area are communicated to form a cold seawater circulating system, the cold seawater pump (5) conveys the cold seawater of the ocean into the condenser (4), a low-pressure low-temperature working medium f at the outlet of the condensing ejector (3) returns the cold seawater with the increased temperature from the condenser (4) to the ocean through a pipeline, and then the cold seawater is conveyed to the condenser (4) through the cold seawater pump (5) to complete cold seawater circulation;

the second outlet (C) of the secondary separator (11) is connected with the first inlets (d) of the heat regenerator (8) and the ejector (3),

the high-pressure working medium liquid flowing out of the separator (11) releases heat through the heat regenerator (8) to become high-pressure super-cooling working medium liquid d, and the high-pressure super-cooling working medium liquid d and the exhaust gas of the working medium e flowing out of the single-screw expander (1) enter the ejector (3) together to form an ejector circulating system;

the warm water refers to a surface area with a high temperature after the ocean system absorbs sunlight, and the cold water refers to an area with a relatively low temperature inside the ocean system.

The words and phrases of the high-pressure supercooling working medium liquid d and other expression working media are all different states of the working media.

When the single-screw expander (1) and the generator (2) have the same rotating speed, the single-screw expander and the generator are connected by a coupler, and when the single-screw expander and the generator have different rotating speeds, a speed reducer is required to be used between the single-screw expander and the generator.

The inlet and the outlet of the single screw expander (1) are provided with valves.

The circulating cold seawater circulating system is provided with valves at the inlet and the outlet of the condenser (4).

The inlet and outlet A, B, C of the separator (11) are provided with valves.

The invention relates to a seawater temperature difference power generation system based on a single-screw expander, which improves the structural compactness of the whole seawater temperature difference power generation system and improves the economical efficiency due to the adoption of the single-screw expander with simple structure, small vibration and low noise.

Drawings

FIG. 1 is a schematic structural diagram of a seawater temperature difference power generation system based on a single screw expander;

in the figure: the system comprises a single-screw expander (1), a generator (2), an ejector (3), a condenser (4), a cold seawater pump (5), a working medium pump (6), a preheater (7), a heat regenerator (8), an evaporator (9), a warm seawater pump (10), a separator (11), a separator inlet (A), a separator inlet (B), a separator outlet (C), an ejector inlet (d), an ejector inlet (e) and an ejector outlet (f).

Detailed Description

The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.