阅读说明：本技术 一种超导能源管道的运行控制系统 (Operation control system of superconducting energy pipeline ) 是由 赵延兴 公茂琼 盛勃闻 毛航银 徐晨博 李振明 陈盼盼 于国鹏 于 2019-11-18 设计创作，主要内容包括：本发明提供的超导能源管道的运行控制系统,包括：超导能源管道、与所述超导能源管道两端连接的储液罐、与其中一储液罐一端管道连接的LNG潜液泵、与所述LNG潜液泵管道连接的制冷单元、与所述制冷单元管道连接的换热器、所述换热器通过管道连接另一所述储液罐,当LNG的需求量减少时,将过量的LNG反向输送回起点,反向输运所用管道为普通输运管道,为保证在输运过程中温升过大,采用混合工质制冷机进行降温；最后,反向输运的LNG进入储液罐前,进入换热器与液氮换热,进一步降温后,进入储液罐,电力正常输送的前提下,实现了LNG输运量的调节。(The invention provides an operation control system of a superconducting energy pipeline, which comprises: the system comprises a superconducting energy pipeline, liquid storage tanks connected with two ends of the superconducting energy pipeline, an LNG immersed pump connected with a pipeline at one end of one liquid storage tank, a refrigeration unit connected with the LNG immersed pump pipeline, a heat exchanger connected with the refrigeration unit pipeline, and the heat exchanger is connected with the other liquid storage tank through a pipeline; and finally, the LNG transported reversely enters the liquid storage tank, enters the heat exchanger to exchange heat with liquid nitrogen, further cools and enters the liquid storage tank, and the LNG transportation volume is adjusted on the premise of normal power transmission.)

1. An operation control system of a superconducting energy pipeline, comprising: the system comprises a superconducting energy pipeline, a first liquid storage tank, a second liquid storage tank, an LNG immersed pump, a refrigeration unit and a heat exchanger, wherein the first liquid storage tank and the second liquid storage tank are connected with two ends of the superconducting energy pipeline, the LNG immersed pump is connected with one end of the second liquid storage tank through a pipeline, the refrigeration unit is connected with the LNG immersed pump through a pipeline, the heat exchanger is connected with the other first liquid storage tank through a pipeline, when the demand of LNG is reduced, the excess LNG is reversely conveyed to the LNG immersed pump through the second liquid storage tank, is cooled through the refrigeration unit, enters the heat exchanger for heat exchange, and then enters the first liquid storage tank.

2. The system according to claim 1, wherein a plurality of the superconducting energy pipelines are disposed between the liquid storage tanks, an even number of the superconducting energy pipelines are grouped into two by two, and the superconducting energy pipelines in the same group are connected by a first solenoid valve.

3. The system according to claim 1, wherein the refrigerating unit is a mixed refrigerant refrigerator.

4. The system for controlling the operation of a superconducting energy pipeline according to claim 1, wherein the heat exchanger uses liquid nitrogen as a cooling medium.

Technical Field

The invention relates to the technical field of superconducting cables, in particular to an operation control system of a superconducting energy pipeline.

Background

The geographical distribution of energy resources and load resources in China is extremely unbalanced, most of power resources are distributed in the west and north, and most of population and load resources are distributed in the middle and east. In consideration of the future development of renewable energy, the contradiction of unbalanced distribution of energy resources and load resources in the future of China is more prominent. Meanwhile, about 5 billion kilowatts of electricity are required to be transmitted from the western region to the middle-east region in China, and annual transmission of electric energy reaches 2.3 to 2.5 trillions. Therefore, with the increasing proportion of renewable energy resources in energy resources, not only the basic patterns of 'west electric east transmission' and 'north electric south transmission' in China are not changed, but also the contradiction between the imbalance distribution of power resources and load resources is further deepened, and the development of a large-capacity remote power transmission technology is still necessary.

With the continuous starting of projects such as west-gas-east transportation and west-electricity-east transportation, gas and electricity are simultaneously transported to enter the field of view of superconducting research, and the natural gas liquefaction equipment is utilized to simultaneously meet the requirements of superconducting power transmission, reduce the cost of the superconducting power transmission and improve the stability and the safety of natural gas transportation.

If liquefied natural gas (the liquefaction temperature is 110K) or liquid hydrogen (the liquefaction temperature is 27K) is adopted as a cooling medium in a cooling system required by the superconducting direct current transmission cable, the integration of power transmission and gas transmission can be realized. This is because, on one hand, the critical temperature of the existing high-temperature superconducting materials such as TlBaCuO (Tc-125K) and HgBaCuO (Tc-150K) exceeds the liquefied natural gas temperature, and only from the perspective of the critical temperature, the possibility of developing a power transmission and gas transmission integrated superconducting energy pipeline is provided; on the other hand, the renewable energy has the characteristic of volatility, and natural gas or hydrogen is prepared by utilizing the renewable energy, so that the non-schedulable fluctuating energy can be converted into schedulable energy, and the superconductivity transmission cable cooling device can be used for cooling the superconductivity transmission cable.

However, during the transportation process of the superconducting energy pipeline, the transportation volume of the pipeline needs to change according to the change of the actual demand volume, when the demand volume is reduced, the transportation volume is reduced, due to the reduction of the transportation volume, the temperature rise during the transportation process is increased, and when the temperature is increased to be higher than the superconducting critical temperature (90K), the cable is not superconducting any more.

Disclosure of Invention

Therefore, there is a need to provide an operation control system for a superconducting energy pipeline, which can solve the problem of cooperative control of LNG flow and superconducting cable temperature during transportation, aiming at the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an operation control system of a superconducting energy pipeline, which comprises: the system comprises a superconducting energy pipeline, a first liquid storage tank, a second liquid storage tank, an LNG immersed pump, a refrigeration unit and a heat exchanger, wherein the first liquid storage tank and the second liquid storage tank are connected with two ends of the superconducting energy pipeline, the LNG immersed pump is connected with one end of the second liquid storage tank through a pipeline, the refrigeration unit is connected with the LNG immersed pump through a pipeline, the heat exchanger is connected with the other first liquid storage tank through a pipeline, when the demand of LNG is reduced, the excess LNG is reversely conveyed to the LNG immersed pump through the second liquid storage tank, is cooled through the refrigeration unit, enters the heat exchanger for heat exchange, and then enters the first liquid storage tank.

In some preferred embodiments, a plurality of the superconducting energy pipelines are included between the liquid storage tanks, an even number of the superconducting energy pipelines are set into a group in pairs, and the superconducting energy pipelines in the same group are connected by a first electromagnetic valve.

In some preferred embodiments, the refrigeration unit is a mixed refrigerant refrigerator.

In some preferred embodiments, the heat exchanger uses liquid nitrogen as a cooling medium.

The invention adopts the technical scheme that the method has the advantages that:

the invention provides an operation control system of a superconducting energy pipeline, which comprises: the system comprises a superconducting energy pipeline, liquid storage tanks connected with two ends of the superconducting energy pipeline, an LNG immersed pump connected with a pipeline at one end of one liquid storage tank, a refrigeration unit connected with the LNG immersed pump pipeline, a heat exchanger connected with the refrigeration unit pipeline, and the heat exchanger is connected with the other liquid storage tank through a pipeline; and finally, the LNG transported reversely enters the liquid storage tank, enters the heat exchanger to exchange heat with liquid nitrogen, further cools and enters the liquid storage tank, and the LNG transportation volume is adjusted on the premise of normal power transmission.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an operation control system of a superconducting energy pipeline according to an embodiment of the present invention.

Fig. 2 is a schematic view of a self-circulation system of an operation control system of a superconducting energy pipeline according to an embodiment of the present invention.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.