CN113203035A - Chain type constant-pressure gas storage system - Google Patents

Chain type constant-pressure gas storage system Download PDF

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Publication number
CN113203035A
CN113203035A CN202110423387.1A CN202110423387A CN113203035A CN 113203035 A CN113203035 A CN 113203035A CN 202110423387 A CN202110423387 A CN 202110423387A CN 113203035 A CN113203035 A CN 113203035A
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pressure
low
liquid
container
operating state
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Chinese (zh)
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姜彤
周淳
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North China Electric Power University
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North China Electric Power University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer

Abstract

The invention aims to provide a chain type constant-pressure gas storage system and a high-efficiency constant-parameter gas storage and discharge method. The system comprises: three or more pressure vessels A with equal effective volumes, a liquid driving device G, high-pressure and low-pressure liquid pipelines HT and LT and high-pressure and low-pressure gas pipelines HP and LP. The pressure vessels are connected to a high-pressure gas line HP, a low-pressure gas line LP and a high-pressure liquid line HT, a low-pressure liquid line LT, and the liquid drive G can be seen as being connected between the two pressure vessels via the high-pressure liquid line HT and the low-pressure liquid line LT. According to the chain type gas storage and chain type gas exhaust strategies, liquid is continuously transferred between the pressure containers to realize gas exhaust and gas storage.

Description

Chain type constant-pressure gas storage system
Technical Field
The invention relates to the field of large-scale power system energy storage, in particular to a condition that compressed gas energy storage needs to ensure constant pressure in a gas storage process.
Background
In recent years, with the continuous development of economy in China, the power consumption is continuously increased. The problems of grid frequency caused by the large-scale application of new energy and intermittent renewable energy, the expansion and growth of the traditional power peak-valley difference value and the related problems of various power energy sources continuously appear. The compressed air energy storage is an important energy storage technology, has the advantages of low construction and operation cost, long working time, long service life, small site limitation and the like, and is an energy storage technology with great development prospect.
In compressed air energy storage, a scheme of variable pressure air storage is often adopted. Because the initial pressure changes greatly, when the gas storage pressure is lower than a value, the power generation cannot be carried out, and the capacity of the equipment cannot be fully utilized. On the other hand, the continuous change of the initial pressure causes the continuous change of the operation parameters of the equipment, reduces the efficiency of the compression equipment and also has adverse effect on the service life of the equipment. Constant pressure gas storage can keep the operating parameters of the compression equipment stable, and almost all stored energy can be fully utilized, thereby effectively solving the problems. The existing constant-pressure gas storage technology, such as a water-sealed double-layer constant-pressure gas storage system, needs to occupy space by using liquid with the same volume when compressed air with a certain volume flows in or flows out, and needs a storage container with the same volume as a gas storage space, so that the occupied space of the system is increased, and the construction cost is increased.
It is therefore desirable to solve the problems of the prior art while maintaining the advantages of the constant pressure gas storage technology.
Disclosure of Invention
The invention aims to provide a chain type constant-pressure gas storage system and a high-efficiency constant-parameter gas storage and discharge method. The system comprises: three or more pressure vessels A with equal effective volumes, a liquid driving device G, high-pressure and low-pressure liquid pipelines HT and low-pressure and high-pressure and low-pressure gas pipelines HP and LP.
A chain-type constant-pressure gas storage system is composed of three or more pressure containers A with same effective volume, which are connected to high-and low-pressure gas pipelines HP and LP and high-and low-pressure liquid pipelines HT and LT via valves. Two ends of the liquid driving device G are respectively connected with the high-pressure and low-pressure liquid pipelines HT and LT through valve control, and can be considered to be communicated between high-pressure and low-pressure operation state containers. In operation, pressure vessel a has four states: a high-voltage static state HS, a low-voltage static state LS, a high-voltage operation state HO and a low-voltage operation state LO. During gas storage, a chain type gas storage control strategy is adopted, high-pressure gas enters the high-pressure operation state container HO from the high-pressure gas pipeline HP, and liquid in the high-pressure operation state container HO enters the low-pressure operation state container LO through the liquid driving device G. After the low pressure operating state container LO is completely filled with liquid, the high pressure operating state HO is converted into the high pressure static state HS, the low pressure operating state LO is converted into the high pressure operating state HO, and one low pressure static state container LS is selected to be converted into the low pressure operating state container LO. And the circulation is continuous, so that the number of the high-pressure static containers HS is increased, the number of the low-pressure static containers LS is reduced, and the chained gas storage is realized. During exhausting, a chain type exhaust control strategy is adopted, low-pressure gas enters the low-pressure operation state container LO from the low-pressure gas pipeline LP, and liquid in the low-pressure operation state container LO enters the high-pressure operation state container HO through the liquid driving device G. After the high pressure operating state vessel HO is completely filled with liquid, the low pressure operating state LO is converted into the low pressure static state LS, the high pressure operating state HO is converted into the low pressure operating state LO, and one high pressure static state vessel HS is selected to be converted into the high pressure operating state vessel HO. And the circulation is continuous, so that the number of high-pressure static containers HS is reduced, the number of low-pressure static containers LS is increased, and the chained exhaust is realized.
Four states of the pressure vessel are defined as follows:
high-pressure static state HS: a container which is communicated with the high-pressure gas pipeline HP and filled with high-pressure gas, is not communicated with the low-pressure gas pipeline LP, is not communicated with the high-pressure liquid pipeline HT and is not communicated with the low-pressure liquid pipeline LT;
low-voltage static state LS: a container which is communicated with the low pressure gas pipeline LP and filled with low pressure gas is not communicated with the high pressure gas pipeline HP, is not communicated with the low pressure liquid pipeline LT and is not communicated with the high pressure liquid pipeline HT;
high-voltage operating state HO: the container communicated with the high-pressure gas pipeline HP and the high-pressure liquid pipeline HT is not communicated with the low-pressure liquid pipeline LT and is not communicated with the low-pressure gas pipeline LP;
low-voltage operation state: the container communicating with the low-pressure gas line LP and the low-pressure liquid line LT is not communicated with the high-pressure liquid line HT, and is not communicated with the high-pressure gas line HP.
Of all the pressure vessels, at least one is filled with liquid, the liquid-filled vessel being switchable between a high-pressure operating state HO and a low-pressure operating state LO, the low-pressure gas-filled vessel being switchable between a low-pressure operating state LO and a low-pressure rest state LS, the high-pressure gas-filled vessel being switchable between a high-pressure operating state HO and a high-pressure rest state HS.
The fluid driver G may be considered to be connected between the high pressure operating state vessel HO and the low pressure operating state vessel LO via fluid conduits.
During the gas storage or exhaust process, all pressure vessels have only two pressures, including a high-pressure static state and a high-pressure operation state, which are communicated with the high-pressure gas pipeline HP, so that the pressures are kept consistent, and the pressure is kept basically stable during operation. The low-pressure static state and the low-pressure operation state are communicated with the low-pressure gas pipeline LP, the pressure is kept consistent, and the pressure is kept basically stable in operation.
The chained gas storage control strategy is as follows:
the method comprises the following steps: one of the pressure vessels filled with liquid is selected as the high pressure operating state vessel and is in communication with the high pressure gas line HP and the high pressure liquid line HT, and the remaining vessels are in communication with the low pressure gas line LP as the low pressure quiescent state LS. A low-pressure static state container LS is selected as the low-pressure operation state container LO and is communicated with the low-pressure liquid pipe LT. According to the control strategy of the liquid pipeline valve, the liquid driving device G is connected between the high-pressure operation state container HO and the low-pressure operation state container LO through a high-pressure liquid pipeline HT and a low-pressure liquid pipeline LT;
step two: the high-pressure gas enters the high-pressure operating state container HO, and the driving liquid does work outwards through the liquid driving device G and then is transferred from the high-pressure operating state container HO to the low-pressure operating state container LO. When the liquid is completely transferred to the low pressure operating state vessel LO and the high pressure operating state vessel HO is filled with high pressure gas, the high pressure operating state vessel HO is converted to the high pressure static state vessel HS and the low pressure operating state vessel LO is converted to the high pressure operating state vessel HO;
step three: and step two is carried out in a circulating way, the number of the high-pressure static containers HS is continuously increased, the number of the low-pressure static containers LS is continuously reduced, high-pressure gas is injected into the container group, and low-pressure gas is discharged from the container group, so that the gas storage process is realized.
Similarly, the chained exhaust control strategy refers to:
the method comprises the following steps: one of the pressure vessels filled with liquid is selected as a low-pressure operating state vessel LO and connected to a low-pressure gas line LP and a low-pressure liquid line LT, and the remaining vessels are connected to a high-pressure gas line HP as a high-pressure stationary state HS. A high pressure static vessel HS is selected as the high pressure operating vessel HO and is in communication with the high pressure liquid line HT. According to the control strategy of the liquid pipeline valve, the liquid driving device G is connected between the high-pressure operation state container HO and the low-pressure operation state container LO through a high-pressure liquid pipeline HT and a low-pressure liquid pipeline LT;
step two: the low-pressure gas enters the low-pressure operation state container LO, the liquid driving device G is connected with an external power source, and the driving liquid is transferred from the low-pressure operation state container LO to the high-pressure operation state container HO, so that the high-pressure gas is discharged. When the low-pressure operation state container LO is filled with low-pressure gas, the low-pressure operation state container LO is converted into a low-pressure static state container LS, and the high-pressure operation state container HO is converted into a low-pressure operation state container LO;
step three: and step two is carried out in a circulating mode, the number of low-pressure static containers LS is increased continuously, the number of high-pressure static containers HS is reduced continuously, low-pressure gas is injected into the container group, high-pressure gas is discharged from the container group, and the exhaust process is achieved.
The control strategy for controlling the liquid pipeline valve is as follows: the valve between the high-pressure operation state container HO and the high-pressure liquid pipeline HT is closed, the valve between the low-pressure operation state container LO and the low-pressure liquid pipeline LT is closed, the valve between the liquid driving device G and the liquid pipeline is always closed, the valve can be regarded as being connected between the high-pressure operation state container HO and the low-pressure operation state container LO, and other pressure containers are not communicated with the liquid pipeline.
The pressure vessel used in the structure can be formed by connecting a plurality of sub-pressure vessels, and can be regarded as one pressure vessel externally.
When the liquid in one operation state container is judged to be transferred completely, the liquid driving device G is connected between other operation state containers through the switching of the valve between the liquid driving device G and the liquid pipeline. The standard for judging the completion of liquid transfer in the operation state container is as follows: when the height of the liquid in the container reaches a preset zero water level, the liquid in the container is judged to be transferred completely, and the valve acts to enable the liquid driving device G to switch positions.
In the system, the liquid driving device G can adopt a reversible water turbine generator set, or adopt the combination of the water turbine generator set and a water pump at the same time, or adopt a hydraulic mechanism. The device can be operated in various modes, and can be externally connected with a motor and a generator to realize energy conversion.
The liquid driving device G serves as a different role transferring liquid during the air storage and exhaust processes. In the gas storage process, the liquid driving device is used as a load, the high-pressure gas is used as a power source to drive the liquid driving device G to act, and at the moment, the liquid driving device G can be connected with external power generation equipment to recover energy. And in the exhaust process, the liquid driving device G is externally connected with a power device and used as a power source to drive liquid to be transferred between the pressure containers.
The air storage and exhaust processes are mutually reverse actions, and continuous air storage and exhaust actions can be realized. For example, when the gas storage process is completed, the role of the pressure vessel is switched, and the venting action can be continued.
In the gas storage process of the system, the volume of the transferred liquid is equal to the volume of the stored high-pressure gas; during the venting process, the volume of liquid displaced is equal to the volume of high pressure gas displaced. The equal-volume liquid is used for occupying space, so that the constant pressure intensity of high-pressure gas in the gas storage and exhaust processes is ensured.
The pressure vessels are connected to each other through gas pipes, and the interconnected structures are formed into a pressure vessel group.
The invention provides a chain type constant-pressure gas storage method, which has the beneficial effects that:
compared with the prior constant-pressure air storage technology, the liquid quantity used in the process of storing the compressed air with the same volume is less. If the number of the pressure containers used by the chain type gas storage system is n and the gas storage capacity is v, the volume of the liquid used by the invention is the volume of the liquid used by the common gas storage equipment.
Under the same liquid cost, the volume of the used liquid is smaller, so the invention can use the liquid with high unit price cost and better performance. The solubility of compressed gas and the rusting and corrosion degree of a gas storage system are reduced, and the performance and the service life of the system are improved.
A series of small pressure containers are connected in parallel to realize constant-pressure gas storage, the requirement on pressure change is not high, and the device can be operated at high pressure, low pressure and medium pressure. Unlike common constant pressure gas storage techniques, the system is primarily directed to stabilization of operating parameters rather than constant pressure for all pressure vessels. The compressor expander operates under fixed parameters, so that the manufacturing cost of pressure vessel pressure level reduction can be saved while the operating efficiency is improved.
On the premise of the same gas storage capacity, the total volume of the equipment of the chain type gas storage system is smaller than that of the common gas storage system, and if the total volume of the pressure container used in the invention is V, the total volume of the pressure container of the common constant-pressure gas storage system is V.
The device has strong flexibility, and the gas storage volume of the pressure container chain can be adjusted by increasing or decreasing the pressure container according to the different required gas storage volumes.
Drawings
Fig. 1 is a view showing a structure of a complete system of the present invention, in which each device is connected to a pipe when four pressure vessels are used to form a compression vessel chain.
Fig. 2 is a schematic view of roles of devices in the operation process of the present invention.
FIG. 3 is a schematic view of the transfer of the liquid from one process vessel to another and complete filling of the process vessel according to the present invention.
FIG. 4 is a schematic diagram illustrating the steps of the gas storage process when four pressure vessels are used to form a pressure vessel group according to the present invention.
FIG. 5 is a schematic diagram illustrating the steps of the venting process when four pressure vessels are used to form a pressure vessel cluster according to the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention.
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting 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.
As shown in fig. 1, a chain type liquid piston compression system in which four pressure vessels constitute a pressure vessel chain includes: pressure vessel a1, pressure vessel a2, pressure vessel A3 and pressure vessel a 4. D1 and D3 are high-pressure gas pipeline valves, and D2 and D4 are low-pressure gas pipeline valves. D5-D12 are valves controlling the connection of gas lines between pressure vessels. B1-B8 are valves for controlling the connection of liquid channels, wherein B1, B2, B4 are connected with high-pressure liquid pipeline, B3, B5, B6 are connected with low-pressure liquid pipeline, and B7, B8 are valves for connecting liquid driving device G with liquid channel bus.
The pressure vessels in the pressure vessel chain have four states, and are connected in groups according to the pressure vessel states, and the states of the pressure vessels are defined as follows:
high-pressure static state: the container is communicated with the high-pressure gas pipeline and filled with high-pressure gas, is not communicated with the low-pressure gas pipeline, is not communicated with the high-pressure liquid pipeline and is not communicated with the low-pressure liquid pipeline;
low-pressure static state: the container is communicated with the low-pressure gas pipeline and filled with low-pressure gas, and is not communicated with the high-pressure gas pipeline, the low-pressure liquid pipeline and the high-pressure liquid pipeline;
high-voltage operation state: the container communicated with the high-pressure gas pipeline and the high-pressure liquid pipeline is not communicated with the low-pressure liquid pipeline and is not communicated with the low-pressure gas pipeline;
low-voltage operation state: the container communicated with the low-pressure gas pipeline and the low-pressure liquid pipeline is not communicated with the high-pressure liquid pipeline and is not communicated with the high-pressure gas pipeline;
at least one of the pressure vessels is filled with liquid, the liquid-filled vessel is switchable between a high-pressure operating state and a low-pressure operating state, the low-pressure gas-filled vessel is switchable between a low-pressure operating state and a low-pressure rest state, and the high-pressure gas-filled vessel is switchable between a high-pressure operating state and a high-pressure rest state
The liquid driving device can be regarded as being connected between the high-pressure operation state container and the low-pressure operation state container through the liquid pipeline.
As shown in fig. 2, in the system in operation, the roles of each device are: a low pressure quiescent pressure vessel LS at a1, a low pressure operating pressure vessel LO at a2, a high pressure operating pressure vessel HO at A3, a high pressure quiescent pressure vessel HS at a4, a LP low pressure gas conduit, a HP high pressure gas conduit, a LT low pressure liquid conduit, a HT high pressure liquid conduit.
As shown in fig. 1 and 3, the complete process of transferring liquid from one container to another is:
in FIG. 3-A, A2 is used as a high-pressure operating state container and filled with liquid, A1 is used as a low-pressure operating state container, and a liquid driver G is connected between A1 and A2. In fig. 3-B, liquid in a2 is driven by high pressure gas through liquid driver G into a 1. In fig. 3-C, the liquid completely enters a1, a1 is filled with liquid as a high-pressure operation state container, and the liquid driving device G is switched between a1 and another low-pressure operation state container to complete a liquid transfer.
As shown in fig. 1 and 4, the gas storage process of the chain type constant pressure gas storage device includes:
the first state: as shown in fig. 2-a, pre-gas storage state. The pressure vessel A4 is connected with a high-pressure gas pipeline as a high-pressure operation state vessel, the A4 is filled with liquid, and the D3 is kept closed. The valves D12, D5, D7 and D9 are closed, the pressure vessels A1, A2 and A3 are communicated with each other as low-pressure static vessels and are communicated with a low-pressure gas pipeline, and the D2 is kept closed. Valves B4, B6, B7, B8 are closed, A3 is selected as a low-pressure operation state container, and a liquid driving device is connected between the pressure containers A3 and a4 to drive liquid transfer;
and a second state: as shown in fig. 2-B, the gas storage process. The high-pressure gas enters the pressure container A4 and is used as a power source to drive the liquid to be transferred from A4 to A3 through the driving device G, A4 becomes a high-pressure operation state container, and A3 becomes a low-pressure operation state container. Until the liquid in A4 was completely transferred to A3, A4 became the high pressure static container and A3 became the high pressure operating container. The valves B4 and B6 are disconnected, and the next step of gas storage is carried out;
and a third state: as shown in fig. 2-C, the gas storage process. The valve D10 is closed, the valve D9 is opened, and the pressure vessel A1 is connected with the pressure vessel A2, and the pressure vessel A3 is connected with the pressure vessel A4. The valves B2, B5, A3 were closed as high pressure operating state vessels and A2 was closed as low pressure operating state vessels. The liquid enters A2 from A3 under the push of high-pressure gas, until the liquid in A3 is completely transferred to A2, A3 becomes a high-pressure static container, and A2 becomes a high-pressure operating container. The valves B2 and B5 are disconnected, and the next step of gas storage is carried out;
and a fourth state: as shown in fig. 2-D, the gas storage process. The valve D8 is closed, the valve D7 is opened, and the pressure vessels A2, A3 and A4 are connected. The valves B1, B3, A2 were closed as high pressure operating state vessels and A1 was closed as low pressure operating state vessels. Liquid enters A1 from A2 under the push of high-pressure gas, until the liquid in A2 is completely transferred to A1, A2 becomes a high-pressure static state container, and A1 becomes a low-pressure operation state container. Disconnect valves B2, B5;
and a fifth state: as shown in fig. 2-E, the gas storage process is complete. The valves B7 and B8 are disconnected, and the valves D2 and D3 are disconnected to cut off the communication with the external air source. The high-pressure gas is stored in a communicating vessel formed by A2, A3 and A4.
As shown in fig. 1 and 5, the exhaust process of the chain type constant pressure gas storage apparatus includes:
the first state: as shown in fig. 3-a, pre-venting condition. A1 is connected with low-pressure gas pipeline as a low-pressure operation state container, A1 is filled with liquid, and D2 valve is closed. Valves B1, B3, B7, B8 were closed. The valve D6 is opened, the valves D5, D8, D10 and D12 are closed, the pressure containers A2, A3 and A4 are connected with a high-pressure gas pipeline as a high-pressure static state container group, and the valve D3 is closed. Selecting A2 as high-pressure operation container, and driving liquid between A1 and A2 by external power source to transfer liquid;
and a second state: as shown in fig. 3-B, the exhaust process. The low pressure gas enters the pressure vessel a1 and the liquid driving device G acts as a power source to drive the liquid transfer from a1 to a 2. Until the liquid in A1 was completely transferred to A2, A1 became the low pressure static container and A2 became the low pressure operating container. The valves B1 and B3 are disconnected, and the next step of exhausting is carried out;
and a third state: as shown in fig. 3-C, the venting process. The valve D7 is closed, the valve D8 is opened, and the pressure vessel A1 is connected with the pressure vessel A2, and the pressure vessel A3 is connected with the pressure vessel A4. The valves B2, B5, A3 were closed as high pressure operating state vessels and A2 was closed as low pressure operating state vessels. The liquid is driven by the liquid driving device to enter A3 from A2 until the liquid in A2 is completely transferred to A3, A2 becomes a low-pressure static state container, and A3 becomes a low-pressure operation state container. The valves B2 and B5 are disconnected, and the next step of gas storage is carried out;
and a fourth state: as shown in fig. 3-D, the venting process. The valve D9 is closed, the valve D10 is opened, and the pressure vessels A1, A2 and A3 are connected. The valves B4, B6, A4 were closed as high pressure operating state vessels and A3 was closed as low pressure operating state vessels. The liquid is driven by the liquid driving device to enter A4 from A3 until the liquid in A3 is completely transferred to A4, A3 becomes a low-pressure static state container, and A4 becomes a low-pressure operation state container. Disconnect valves B4, B6;
and a fifth state: as shown in fig. 3-E, the gas storage process is complete. The valves B7 and B8 are disconnected, and the valves D2 and D3 are disconnected to cut off the communication with the external air source. The exhaust process is completed.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A chain type constant-pressure gas storage system and an operation method thereof are characterized in that the system comprises: three or more than three pressure containers (A) with the same effective volume and liquid driving equipment (G), wherein each pressure container is connected with a high-pressure gas pipeline (HP), a low-pressure gas pipeline (LP), a high-pressure liquid pipeline (HT) and a low-pressure liquid pipeline (LT) through valve control; two ends of the liquid driving device (G) are respectively connected with the high-pressure liquid pipeline (HT) and the low-pressure liquid pipeline (LT); in operation, the pressure vessel (a) has four states: a high voltage quiescent state (HS), a low voltage quiescent state (LS) and a high voltage operating state (HO), a low voltage operating state (LO); during gas storage, a chain type gas storage control strategy is adopted, high-pressure gas enters a high-pressure operation state container (HO) from a high-pressure gas pipeline (HP), and liquid in the high-pressure operation state container (HO) enters a low-pressure operation state container (LO) through a liquid driving device (G); after the low-pressure operating state container (LO) is completely filled with liquid, the high-pressure operating state (HO) is converted into a high-pressure static state (HS), the low-pressure operating state (LO) is converted into a high-pressure operating state (HO), and one low-pressure static state container (LS) is selected to be converted into the low-pressure operating state container (LO); the circulation is continuous, so that the number of high-pressure static containers (HS) is increased, the number of low-pressure static containers (LS) is reduced, and chain type gas storage is realized; during exhausting, adopting a chain type exhaust control strategy, enabling low-pressure gas to enter a low-pressure operation state container (LO) from a low-pressure gas pipeline (LP), and enabling liquid in the low-pressure operation state container (LO) to enter a high-pressure operation state container (HO) through a liquid driving device (G); after the high-pressure operating state container (HO) is completely filled with liquid, the low-pressure operating state (LO) is converted into a low-pressure static state (LS), the high-pressure operating state (HO) is converted into a low-pressure operating state (LO), and one high-pressure static state container (HS) is selected to be converted into a high-pressure operating state container (HO); the circulation is continuous, so that the number of high-pressure static containers (HS) is reduced, the number of low-pressure static containers (LS) is increased, and chain type exhaust is realized.
2. The system of claim 1, wherein the four states of the pressure vessel are specifically defined as:
high pressure static (HS): a container which is communicated with the high pressure gas pipeline (HP) and filled with high pressure gas, is not communicated with the low pressure gas pipeline (LP), is not communicated with the high pressure liquid pipeline (HT) and is not communicated with the low pressure liquid pipeline (LT);
low pressure static (LS): a container which is communicated with the low pressure gas pipeline (LP) and is filled with low pressure gas, is not communicated with the high pressure gas pipeline (HP), is not communicated with the low pressure liquid pipeline (LT), and is not communicated with the high pressure liquid pipeline (HT);
high voltage operating state (HO): a container communicating with the high pressure gas conduit (HP) and the high pressure liquid conduit (HT), not communicating with the low pressure liquid conduit (LT), not communicating with the low pressure gas conduit (LP);
low voltage operating state (LO): a container communicating with the low pressure gas Line (LP) and the low pressure liquid Line (LT), not communicating with the high pressure liquid line (HT), not communicating with the high pressure gas line (HP);
of all pressure vessels, at least one is filled with liquid, the liquid-filled vessel being switchable between a high-pressure operating state (HO) and a low-pressure operating state (LO), the low-pressure gas-filled vessel being switchable between a low-pressure operating state (LO) and a low-pressure rest state (LS), the high-pressure gas-filled vessel being switchable between a high-pressure operating state (HO) and a high-pressure rest state (HS)
The liquid drive (G) may be considered to be connected between the high pressure operating state vessel (HO) and the low pressure operating state vessel (LO) via a liquid conduit.
3. The system of claim 1, wherein the chained gas storage control strategy is: in the gas storage process, selecting a pressure container filled with liquid, communicating the pressure container with a high-pressure gas pipeline (HP) and a high-pressure liquid pipeline (HT) to convert the pressure container into a high-pressure operating state container (HO), selecting one of low-pressure static state containers (LS) to communicate with a low-pressure liquid pipeline (LT) to convert the low-pressure operating state container (LO), and communicating a liquid driving device (G) between the high-pressure operating state container (HO) and the low-pressure operating state container (LO); high-pressure gas enters a high-pressure operating state container (HO), liquid in the high-pressure operating state container (HO) enters a low-pressure operating state container (LO) after being worked outwards through a liquid driving device (G), the low-pressure gas in the low-pressure operating state container (LO) is discharged to a low-pressure gas pipeline (LP), after the low-pressure operating state container (LO) is filled with the liquid, the high-pressure operating state container (HO) is disconnected from the high-pressure liquid pipeline (HT) and is kept communicated with the high-pressure gas pipeline (HP), the high-pressure operating state container (HO) is converted into a high-pressure static state container (HS), the low-pressure operating state container (LO) filled with the liquid is disconnected from the low-pressure gas pipeline (LP) and the low-pressure liquid pipeline (LT), the high-pressure gas pipeline (HP) and the high-pressure liquid pipeline (HT) are communicated, and the high-pressure operating state container (HO) is converted into the high-pressure operating state container (HO); the process is circulated, the number of high-pressure static containers (HS) is increased, the number of low-pressure static containers (LS) is reduced, and the gas storage process is realized.
4. The system as described in claim 1, said chained exhaust control strategy is: during the exhaust process, selecting a pressure container filled with liquid, connecting the pressure container to a low-pressure gas pipeline (LP) and a low-pressure liquid pipeline (LT), converting the pressure container into a low-pressure operating state container (LO), selecting one of high-pressure static state containers (HS) to be connected to a high-pressure liquid pipeline (HT), and converting the pressure container into a high-pressure operating state container (HO); the liquid driving device (G) is connected with an external power source, liquid in the low-pressure operation state container (LO) is driven by the liquid driving device (G) to enter the high-pressure operation state container (HO) so that high-pressure gas is discharged to the high-pressure gas pipeline (HP), and after the high-pressure operation state container (HO) is filled with the liquid, the low-pressure operation state container (LO) disconnects the low-pressure liquid pipeline (LT) and keeps communicating with the low-pressure gas pipeline (LP), and the low-pressure operation state container (LO) is converted into a low-pressure static state container (LS); the high pressure operating state container (HO) is filled with liquid, the communication state with the high pressure gas pipeline (HP) and the high pressure liquid pipeline (HT) is cut off, the low pressure gas pipeline (LP) and the low pressure liquid pipeline (LT) are connected, and the low pressure operating state container (LO) is converted; the process is circulated, the number of low-pressure static containers (LO) is increased, the number of high-pressure static containers (HS) is reduced, and the exhaust process is realized.
5. The system according to claim 1, wherein the fluid driving device (G) is a reversible hydro-generator set, or a combination of a hydro-generator set and a water pump, or a hydraulic mechanism.
6. The system of claim 1, wherein each pressure vessel is formed by connecting a plurality of sub-pressure vessels, the plurality of sub-pressure vessels form a communicating vessel, and the communicating vessel is regarded as one pressure vessel.
CN202110423387.1A 2021-04-20 2021-04-20 Chain type constant-pressure gas storage system Pending CN113203035A (en)

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CN202110423387.1A CN113203035A (en) 2021-04-20 2021-04-20 Chain type constant-pressure gas storage system

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CN113203035A true CN113203035A (en) 2021-08-03

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CN202110423387.1A Pending CN113203035A (en) 2021-04-20 2021-04-20 Chain type constant-pressure gas storage system

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