Gas-liquid isolation type gas compression equipment

Abstract

The utility model relates to gas-liquid isolation type gas compression equipment. The gas-liquid isolation type gas compression equipment comprises at least three groups of compression gas storage tanks, a gas inlet assembly, a gas outlet assembly and a liquid adding and returning assembly. And the pressure bearing capacities of the at least three groups of compressed air storage tanks are sequentially reduced. The multiple groups of compressed air storage tanks are defined as the nth group of compressed air storage tanks according to the sequence of the pressure bearing capacities from small to large, and n meets the following relation: n = 1, 2,..., and n is less than or equal to the number of the compressed air storage tanks. The control device is constructed to be capable of controlling on-off of all channels in the gas inlet assembly, the gas exhaust assembly and the liquid adding and returning assembly so that the working state of the gas-liquid isolation type gas compression equipment can be sequentially switched to the gas discharging state and the nth gas compression state according to the sequence of n from small to large till n = the group number of the compressed gas storage tanks minus 1. According to the gas-liquid isolation type gas compression equipment, the gas storage cost of a hydrogen refueling station can be effectively reduced, and the safety of gas compression work in the storage process can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas compression equipment, in particular to a gas-liquid isolation type gas compression equipment. Background Art

[0002] As a secondary clean energy, hydrogen energy is known as the "ultimate energy of the 21st century", and the production, storage, transportation and application technology of hydrogen will also become the focus of attention in the 21st century. Among them, hydrogen storage is a crucial technology and has become a bottleneck for the large-scale utilization of hydrogen energy. Hydrogen is a gas, and its transportation and storage are more difficult than solid coal and liquid petroleum. The main storage methods of hydrogen include high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage and hydrogen storage material storage. High-pressure gaseous hydrogen storage is the most commonly used hydrogen storage method and the most mature hydrogen storage technology. Hydrogen is compressed and stored in the form of gas in a cylinder.

[0003] At present, the technical types of hydrogen refueling stations can be divided into off-site hydrogen production and on-site hydrogen production according to the source of hydrogen. Among them, off-site hydrogen production is widely used due to its lower hydrogen production cost. Off-site hydrogen production refers to centralized production at the hydrogen production plant, and then transported to the hydrogen refueling station through transportation equipment such as containers and long-tube trailers. The low-pressure hydrogen transported is compressed in the hydrogen refueling station and stored in the high-pressure hydrogen storage container in the station. However, the gas tank of the transportation equipment is large in volume, and the gas compression capacity of a single hydrogen compressor is limited. Therefore, the process of compressing the hydrogen in the transportation equipment and storing it in the high-pressure gas storage container takes a long time. During this process, the transportation equipment can only wait in place, resulting in a long waiting time for the transportation equipment and low vehicle utilization, which makes the hydrogen transportation cost high. Moreover, as hydrogen is a flammable and explosive gas, the longer the transportation equipment and the hydrogen compressor work at the same time, the higher the risk of accidents between the two.

[0004] In order to solve the above problems, the waiting time of transport vehicles during the hydrogen compression process is usually shortened by increasing the number of hydrogen compressors or increasing the compression volume of hydrogen compressors and other parameters. However, since the hydrogen compressor and the high-pressure hydrogen storage container are set independently, the pressure bearing capacity of the compression tank in the hydrogen compressor needs to meet the pressure bearing requirements of the high-pressure hydrogen storage container. Therefore, increasing the number of hydrogen compressors or increasing the compression volume of hydrogen compressors and other parameters will inevitably cause a rapid increase in equipment costs. Therefore, this method cannot completely solve the problem of high high-pressure hydrogen storage costs. Utility Model Content

[0005] Based on this, it is necessary to provide a gas-liquid isolation gas compression device that is safe to use and can reduce the cost of hydrogen.

[0006] A gas-liquid isolation type gas compression device, comprising:

[0007] At least three groups of compressed gas storage tanks, whose pressure bearing capacity decreases in sequence; the multiple groups of compressed gas storage tanks are defined as the nth group of compressed gas storage tanks in the order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of groups of compressed gas storage tanks;

[0008] An air intake assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to open or close an air intake passage between the air intake assembly and all of the compressed air storage tanks;

[0009] an exhaust assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to selectively open an exhaust passage between the nth group of compressed air storage tanks and the n+1th group of compressed air storage tanks, and simultaneously close an exhaust passage between all other compressed air storage tanks;

[0010] Liquid adding and liquid returning components are respectively connected to the bottom ends of the compressed gas storage tanks other than the group of compressed gas storage tanks with the largest pressure bearing capacity, and have liquid injection passages capable of respectively injecting liquid into the multiple groups of compressed gas storage tanks and liquid returning passages for allowing the liquid in the compressed gas storage tanks to flow out;

[0011] The control device is configured to control the opening and closing of each passage in the air intake assembly, the air exhaust assembly and the liquid adding and returning assembly respectively, so as to switch the working state of the gas-liquid isolation type gas compression device to the gas discharge state and the nth gas compression state, and switch in order from small to large n until n=the number of groups of the compressed gas storage tanks-1;

[0012] When in the gas unloading state, the air intake passage and liquid return passage of at least one of the compressed air storage tanks in each group are in an open state, and all the exhaust passages and all the liquid injection passages are in a closed state;

[0013] When in the nth gas compression state, all the air intake passages and all the liquid return passages are in a closed state, the liquid injection passage corresponding to the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks and the compressed gas tank filled with gas to be compressed in the n+1th group of compressed gas tanks is in an open state, and the other exhaust passages are in a closed state.

[0014] The above-mentioned gas-liquid isolation type gas compression equipment can select different numbers of compressed gas storage tanks in each group of compressed gas storage tanks for gas storage and compression work according to the different gas transportation volumes of the transportation equipment, which greatly improves the applicability. In the gas unloading state, at least one compressed gas storage tank in each group of compressed gas storage tanks can be filled with the gas to be compressed, so the gas to be compressed in the transportation equipment can be unloaded all at once, and then quickly leave without waiting, and can quickly enter the next gas transportation work, which greatly improves the utilization rate of the transportation equipment and is conducive to reducing the cost of gas transportation. At the same time, during the gas compression process, the transportation equipment has driven away from the gas-liquid isolation type gas compression equipment, reducing the probability of accidents such as fire and explosion due to the close distance between the two.

[0015] The above-mentioned gas-liquid isolation type gas compression equipment can be switched to the nth gas compression state in sequence, so that the gas in the nth group of compressed gas storage tanks can be compressed by pressure liquid in sequence and then injected into the n+1th group of compressed gas storage tanks, so as to realize multiple superimposed compression of the compressed gas. Therefore, only the pressure bearing capacity of the last group of compressed gas storage tanks is required to meet the pressure requirements during gas storage, and the pressure bearing capacity of the remaining compressed gas storage tanks is reduced in order from large to small in order of n, thereby reducing the manufacturing cost of the gas-liquid isolation type gas compression equipment and further reducing the gas storage cost. Therefore, the above-mentioned gas-liquid isolation type gas compression equipment can effectively reduce the gas storage cost of the hydrogen refueling station, as well as the safety of gas compression work during storage, and has high applicability.

[0016] A gas-liquid isolation type gas compression device, comprising:

[0017] At least three groups of compressed gas storage tanks, whose pressure bearing capacity decreases in sequence; the multiple groups of compressed gas storage tanks are defined as the nth group of compressed gas storage tanks in the order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of groups of compressed gas storage tanks;

[0018] An air intake assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to open or close an air intake passage between the air intake assembly and all of the compressed air storage tanks;

[0019] an exhaust assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to selectively open an exhaust passage between the nth group of compressed air storage tanks and the n+1th group of compressed air storage tanks, and simultaneously close an exhaust passage between all other compressed air storage tanks;

[0020] Liquid adding and liquid returning components are respectively connected to the bottom ends of the compressed gas storage tanks other than the group of compressed gas storage tanks with the largest pressure bearing capacity, and have liquid injection passages capable of respectively injecting liquid into the multiple groups of compressed gas storage tanks and liquid returning passages for allowing the liquid in the compressed gas storage tanks to flow out;

[0021] The control device is configured to control the opening and closing of each passage in the air intake assembly, the air exhaust assembly and the liquid adding and returning assembly respectively, so as to switch the working state of the gas-liquid isolation type gas compression device to the first gas unloading state and the nth gas compression state, and switch in order from small to large n until n=the number of groups of the compressed gas storage tanks-1;

[0022] In the first gas unloading state, the air intake passage and liquid return passage of at least one of the compressed gas storage tanks in each group are in an open state, and all the exhaust passages and all the liquid injection passages are in a closed state;

[0023] When in the nth gas compression state, the liquid injection passage corresponding to the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks and the compressed gas tank filled with gas to be compressed in the n+1th group of compressed gas tanks is in an open state, and the other exhaust passages are in a closed state, the air intake passage and the corresponding liquid return passage corresponding to at least one of the compressed gas tanks in the n-1th group of compressed gas tanks are in an open state, and the other air intake passages and the liquid return passages are in a closed state.

[0024] The above-mentioned gas-liquid isolation type gas compression equipment can be switched to the nth gas compression state in sequence, so that the gas in the nth group of compressed gas storage tanks can be compressed by pressure liquid in sequence and then injected into the n+1th group of compressed gas storage tanks, so as to realize the sequential superposition compression of the gas to be compressed. Therefore, only the pressure bearing capacity of the last compressed gas storage tank is required to meet the pressure requirement during gas storage, and the pressure bearing capacity of the remaining compressed gas storage tanks is reduced in order from large to small, so as to reduce the manufacturing cost of the gas-liquid isolation type gas compression equipment and the gas storage cost; at the same time, while the nth group of compressed gas storage tanks are performing gas compression, the gas to be compressed can be filled into the n-1th group of compressed gas storage tanks, so that the gas to be compressed can be injected into the previous group of compressed gas storage tanks while the current group of compressed gas storage tanks are being compressed, which is beneficial to the improvement of the gas storage efficiency of the hydrogen refueling station. Therefore, the use of the above-mentioned gas-liquid isolation type gas compression equipment can effectively reduce the gas storage cost of the hydrogen refueling station and improve the storage efficiency of the hydrogen refueling station. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a simplified structural diagram of a gas-liquid isolation type gas compression device in one embodiment of the utility model.

[0026] Description of the accompanying drawings in the specific implementation method: 100, gas-liquid isolation gas compression equipment; 110, compressed gas storage tank; 111, gas inlet and outlet; 112, liquid inlet and outlet; 120, air intake assembly; 121, air intake main pipe; 122, air intake branch pipe; 123, air intake valve; 124, air intake main valve; 130, exhaust assembly; 131, exhaust main pipe; 132, exhaust branch pipe; 133, exhaust valve; 134, air supply pipe; 135, air supply valve; 140, liquid addition and return assembly; 141, liquid storage tank; 142, liquid inlet main pipe; 143, liquid inlet branch pipe; 144, liquid return main pipe; 145, liquid return branch pipe; 146, liquid inlet valve; 147, liquid return valve; 148, infusion device. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0030] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0031] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0032] See also Figure 1 The gas-liquid isolation type gas compression device 100 in the preferred embodiment of the utility model is used for gas compression when storing gases such as hydrogen, nitrogen, argon, helium, etc. For the convenience of explanation, in the following embodiments, the gas-liquid isolation type gas compression device 100 is used for hydrogen compression as an example. Among them, the gas-liquid isolation type gas compression device 100 includes at least three groups of compressed gas storage tanks 110, an air intake component 120, an exhaust component 130, a liquid adding and returning component 140 and a control device (not shown).

[0033] The pressure bearing capacity of at least three groups of compressed gas storage tanks 110 decreases in sequence. Multiple groups of compressed gas storage tanks 110 are defined as the nth group of compressed gas storage tanks 110 in order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of groups of compressed gas storage tanks 110. That is, the pressure bearing capacity of the first group of compressed gas storage tanks 110 is the smallest, and the pressure bearing capacity of the last group of compressed gas storage tanks 110 is the largest, and the pressure bearing capacity of multiple groups of compressed gas storage tanks 110 is different from each other. Among them, the compressed gas storage tank 110 can be a hollow container in the shape of a sphere, an ellipsoid, a three-dimensional rectangle, a cylinder, etc., as long as it can withstand high pressure and has good airtightness.

[0034] It should be noted that a group of compressed air storage tanks 110 may include only one compressed air storage tank 110 or may include multiple compressed air storage tanks 110 , and the number of compressed air storage tanks 110 in multiple groups of compressed air storage tanks 110 may be the same or different.

[0035] The air intake assembly 120 is respectively connected to the top end of each compressed air storage tank 110 in the plurality of compressed air storage tanks 110, and is configured to open or close the air intake passage (not shown) between the air intake assembly 120 and all compressed air storage tanks 110. That is, the air intake assembly has a plurality of air intake passages for charging gas into the plurality of compressed air storage tanks 110 one by one.

[0036] The exhaust assembly 130 is respectively connected to the top end of each compressed air tank 110 in the plurality of compressed air tanks 110, and is configured to selectively open the exhaust passage (not labeled in the figure) between the nth compressed air tank 110 and the n+1th compressed air tank 110, and simultaneously close the exhaust passages (not labeled in the figure) between all other compressed air tanks 110. That is, the exhaust assembly 130 has a plurality of exhaust passages, and the exhaust passage corresponding to the first group of compressed air tanks 110 is used to connect the first group of compressed air tanks 110 and the second group of compressed air tanks 110. Similarly, the exhaust passage corresponding to the nth group of compressed air tanks 110 is used to connect the nth group of compressed air tanks 110 and the n+1th group of compressed air tanks 110.

[0037] The liquid adding and liquid returning assembly 140 is respectively connected to the bottom ends of the other compressed gas storage tanks 110 other than the group of compressed gas storage tanks 110 with the largest pressure bearing capacity, and has a liquid injection passage (not marked in the figure) that can respectively inject liquid into the multiple groups of compressed gas storage tanks 110 and a liquid return passage (not marked in the figure) that allows the liquid in the compressed gas storage tanks 110 to flow out. That is, the liquid adding and liquid returning assembly 140 is not connected to the compressed gas storage tank 110 with the largest pressure bearing capacity. In other words, the compressed gas storage tank 110 with the largest pressure bearing capacity can only be used to compress gas and store high-pressure gas, and liquid will not be injected into the compressed gas storage tank 110 with the largest pressure bearing capacity.

[0038] The control device is constructed to be able to control the opening and closing of each passage in the air intake assembly 120, the air exhaust assembly 130 and the liquid adding and returning assembly 140 respectively, so as to switch the working state of the gas-liquid isolation type gas compression device 100 to the gas discharge state and the nth gas compression state in sequence, and switch in order from small to large until n=the number of groups of the compressed gas storage tank 110-1. That is, under the action of the control device, the working state of the gas-isolated gas compression device can be automatically switched to the gas discharge state, the first gas compression state...the nth gas compression state, where n is the number of groups of the compressed gas storage tank 110-1. In this way, the control device realizes the automatic switching of the working state of the gas-liquid isolation type gas compression device 100 by controlling the operation of the air intake assembly 120, the air exhaust assembly 130 and the liquid adding and returning assembly 140.

[0039] When the gas-liquid isolation gas compression device 100 is in the gas unloading state, the air intake passage and the liquid return passage of at least one compressed gas storage tank 110 in each group of compressed gas storage tanks 110 are in the open state, and all exhaust passages and all liquid injection passages are in the closed state.

[0040] When the gas-liquid isolation gas compression device 100 is in the nth gas compression state, all air intake passages and all liquid return passages are in a closed state, the liquid injection passage corresponding to the compressed gas tank 110 filled with gas to be compressed in the nth group of compressed gas tanks 110 is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank 110 filled with gas to be compressed in the nth group of compressed gas tanks 110 and the compressed gas tank 110 filled with gas to be compressed in the n+1th group of compressed gas tanks 110 is in an open state, and the other exhaust passages are in a closed state.

[0041] It should be noted that the pressurized liquid injected into the compressed gas storage tank 110 is not miscible with the gas filled into the compressed gas storage tank 110 , or the solubility of the two is extremely low.

[0042] For ease of understanding, the working process of the gas-liquid isolation type gas compression device 100 is briefly described below:

[0043] Gas unloading process: the gas inlet assembly 120 is connected to the gas storage tank of the transport equipment, and the working state of the gas-liquid isolation type gas compression device 100 is automatically switched to the gas unloading state. At this time, the gas to be compressed in the transport equipment enters the corresponding compressed gas storage tanks 110 through multiple gas inlet passages, so as to realize the gas unloading work of the gas to be compressed in the transport equipment;

[0044] The first gas compression process: the air intake assembly 120 is disassembled from the transportation equipment, and the working state of the gas-liquid isolation type gas compression device 100 is automatically switched to the first gas compression state. At this time, the liquid adding and returning assembly 140 injects pressure liquid into the compressed gas storage tank 110 filled with the gas to be compressed in the first group of compressed gas storage tanks 110 to compress the gas in the first group of compressed gas storage tanks 110. At the same time, under the push of the pressure liquid, the gas in the first group of compressed gas storage tanks 110 is pressed into the compressed gas storage tank 110 filled with the gas to be compressed in the second group of compressed gas storage tanks 110, until all the gas in the first group of compressed gas storage tanks 110 enters the second group of compressed gas storage tanks 110;

[0045] …

[0046] The nth gas compression process: the working state of the gas-liquid isolation gas compression device 100 is automatically switched to the nth gas compression state, at which time the liquid adding and returning component 140 injects pressurized liquid into the compressed gas storage tank 110 filled with the gas to be compressed in the nth group of compressed gas storage tanks 110, so as to compress the gas in the nth group of compressed gas storage tanks 110, and at the same time, under the driving effect of the pressurized liquid, the gas in the nth group of compressed gas storage tanks 110 is pressed into the compressed gas storage tank 110 filled with the gas to be compressed in the n+1th group of compressed gas storage tanks 110, until all the gas in the nth group of compressed gas storage tanks 110 enters the n+1th group of compressed gas storage tanks 110;

[0047] …

[0048] The last gas compression process: the working state of the gas-liquid isolation gas compression device 100 is automatically switched to the (number of compressed gas transmission tank groups-1)th gas compression state. At this time, the liquid adding and returning component 140 injects pressurized liquid into the compressed gas storage tank 110 filled with gas to be compressed in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity, so as to compress the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity. At the same time, under the driving effect of the pressurized liquid, the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity is pressed into the compressed gas storage tank 110 filled with gas to be compressed in the group of compressed gas storage tanks 110 with the largest pressure bearing capacity, until all the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity enters the compressed gas storage tank 110 with the largest pressure bearing capacity.

[0049] It should be noted that when all the gases to be compressed are compressed and stored in the compressed gas storage tank 110 with the largest pressure-bearing capacity, all the compressed gas storage tanks 110 except the compressed gas storage tank 110 with the largest pressure-bearing capacity are filled with liquid; in this way, when the next gas unloading operation is carried out, the liquid in the compressed gas storage tank 110 will be gradually discharged through the liquid return passage as the gas to be compressed enters, thereby ensuring the purity of the gas to be compressed in the compressed gas storage tank 110.

[0050] Therefore, all compressed gas storage tanks 110 in the gas-liquid isolation gas compression device 100 have the functions of gas storage and gas compression. In practical applications, the number and volume of compressed gas storage tanks 110 can be selected according to the gas transport volume of the transport equipment and the pressure requirement of the compressed gas.

[0051] The above-mentioned gas-liquid isolation type gas compression equipment 100 can select different numbers of compressed gas storage tanks in each group of compressed gas storage tanks to store and compress gas according to the different gas transportation volumes of the transportation equipment, which greatly improves the applicability. In the gas unloading state, at least one compressed gas storage tank in each group of compressed gas storage tanks can be filled with the gas to be compressed, so the gas to be compressed in the transportation equipment can be unloaded all at once, and then quickly leave without waiting, and can quickly enter the next gas transportation work, which greatly improves the utilization rate of the transportation equipment, is conducive to reducing the gas transportation cost, and thus can reduce the storage cost of hydrogen. At the same time, when the gas-liquid isolation type gas compression equipment 100 is compressing the gas, the transportation equipment has already left the gas-liquid isolation type gas compression equipment 100, reducing the probability of accidents such as fire and explosion due to the close distance between the two.

[0052] Furthermore, the gas-liquid isolation type gas compression device 100 can be switched to the nth gas compression state (n=1, 2... the number of compressed gas storage tanks 110 - 1) in sequence, so that the gas in the nth group of compressed gas storage tanks 110 can be compressed in sequence by injecting pressure liquid, and at the same time, the compressed gas in the nth group of compressed gas storage tanks 110 will be squeezed into the n+1th group of compressed gas storage tanks 110, so as to realize multiple superimposed compression of the compressed gas (i.e., the gas in the first group of compressed gas transmission tanks 110 is compressed and sent to the second group The gas in the compressed gas storage tank 110 is compressed, and then the gas in the second group of compressed gas transmission tanks 110 is compressed and sent to the third group of compressed gas storage tanks 110... Finally, the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity is compressed and sent to the compressed gas storage tank 110 with the largest pressure bearing capacity). Therefore, only the compressed gas storage tank 110 with the largest pressure bearing capacity is required to meet the pressure requirement during gas storage, and the pressure bearing capacities of the remaining compressed gas storage tanks 110 are all less than the pressure requirement during gas storage, and decrease in order from large to small according to n.

[0053] In the manufacture of pressure vessels, the manufacturing cost of high-pressure vessels will rise sharply with the increase of pressure-bearing capacity. Therefore, selecting a compressed gas storage tank 110 with a smaller pressure-bearing capacity can greatly reduce the manufacturing cost of each group of compressed gas storage tanks 110. The compressed gas storage tank 110 with the largest pressure-bearing capacity is used to store high-pressure gas that meets the pressure requirements, so it is smaller in size. Compared with the traditional gas compression equipment, the high-pressure gas storage container and the gas compression container are independently set, and both need to meet the pressure requirements for gas storage. In the utility model, multiple groups of compressed gas storage tanks 110 with different pressure-bearing capacities and gas storage and gas compression functions can effectively reduce the manufacturing cost of the gas-liquid isolation gas compression equipment 100, thereby further reducing the storage cost of the gas.

[0054] Therefore, the above-mentioned gas-liquid isolation type gas compression equipment 100 can effectively reduce the storage cost of hydrogen during compression and storage and the safety risk during the hydrogen compression process, and at the same time has high applicability.

[0055] In some embodiments, each compressed gas storage tank 110 has an air inlet and outlet 111 at the top thereof. Each air inlet and outlet 111 is connected to a corresponding air intake passage in the air intake assembly 120 and a corresponding air exhaust passage in the air exhaust assembly 130, respectively.

[0056] That is, through an air inlet and outlet 111, the intake assembly or the exhaust assembly 130 can inflate or exhaust the compressed air storage tank 110. When in use, it is necessary to ensure that one of the intake channel and the exhaust channel is open, or the intake channel and the exhaust channel are closed at the same time, so as to ensure the normal unloading and gas compression work.

[0057] Compared with opening several holes on the compressed gas storage tank 110 to realize the filling and discharge of gas, under the same material and the same structure, the compressed gas storage tank 110 with only one gas inlet and outlet 111 has a higher pressure-bearing capacity, thereby further reducing the manufacturing cost of the compressed gas storage tank 110 while ensuring the same pressure-bearing capacity.

[0058] Of course, in other embodiments, the top of the compressed gas storage tank 110 may also be provided with an air inlet and an air outlet, respectively, to communicate with the corresponding air inlet passage and exhaust passage, respectively.

[0059] In some embodiments, except for a group of compressed gas storage tanks 110 with the largest pressure bearing capacity, the bottom ends of all other compressed gas storage tanks 110 are provided with liquid inlet and outlet ports 112. Each liquid inlet and outlet port 112 is respectively connected to a corresponding liquid injection passage and a corresponding liquid return passage.

[0060] That is, the liquid injection passage and the liquid return passage are connected to the corresponding compressed gas storage tank 110 through the same liquid inlet and outlet 112. When in use, it is necessary to ensure that one of the liquid injection passage and the liquid return passage is open, or the liquid injection passage and the liquid return passage are closed at the same time, so as to ensure the normal operation of gas unloading and gas compression.

[0061] Compared with opening several holes on the compressed gas storage tank 110 to realize the injection and discharge of liquid, under the same material and the same structure, the compressed gas storage tank 110 with only one liquid inlet and outlet 112 has a higher pressure-bearing capacity, thereby further reducing the manufacturing cost of the compressed gas storage tank 110 while ensuring the same pressure-bearing capacity.

[0062] Of course, in other embodiments, except for the compressed gas storage tank 110 with the largest pressure bearing capacity, the bottom ends of the other compressed gas storage tanks 110 are respectively provided with liquid inlets and liquid outlets to be connected to the corresponding liquid injection passages and the corresponding liquid return passages respectively.

[0063] In some embodiments, the air intake assembly 120 includes an air intake manifold 121, a plurality of air intake branch pipes 122, and a plurality of air intake valves 123. One end of each of the plurality of air intake manifolds 121 is connected to the air intake manifold 121, and the other end is connected to the top ends of the plurality of compressed air storage tanks 110 in a one-to-one correspondence. The plurality of air intake valves 123 are arranged on the plurality of air intake branch pipes 122 in a one-to-one correspondence. The control device is electrically connected to the plurality of air intake valves 123, respectively, and is used to control the plurality of air intake valves 123 to be closed or opened at the same time. Therefore, the air intake manifold 121 is connected to the air intake branch pipes 122 to form an air intake passage, and the opening and closing of the air intake passage is controlled by controlling the opening or closing of the air intake valves 123.

[0064] When it is necessary to discharge all the gas to be compressed on the transport equipment into all the compressed gas storage tanks 110, it is only necessary to connect the air intake manifold 121 to the transport equipment and switch the working state of the gas-liquid isolation type gas compression device 100 to the gas discharge state. At this time, the gas to be compressed in the transport equipment will first enter the air intake manifold 121, and then be divided into a plurality of air intake branch pipes 122 to respectively charge at least one compressed gas storage tank 110 in each group of compressed gas storage tanks 110. The air intake assembly 120 is configured as the air intake manifold 121, the air intake branch pipe 122 and the air intake valve 123, which not only makes the gas discharge operation simple, but also simplifies the structure of the air intake assembly 120.

[0065] Of course, in other embodiments, the air intake assembly 120 can also be configured as multiple air intake pipes and an air intake valve 123 arranged on each air intake pipe. When in use, the multiple air intake pipes need to be connected to the transportation equipment simultaneously or sequentially to inflate multiple compressed air storage tanks 110 simultaneously or sequentially.

[0066] Furthermore, in some embodiments, an air intake main valve 124 is also provided on the air intake main pipe 121. When the gas-liquid isolation type gas compression device 100 is not used for a long time, the air intake main valve 124 can be closed to ensure the safety of the device. When the gas-liquid isolation type gas compression device 100 is in use, the air intake main valve 124 can be opened, and the opening and closing of the air intake passage can be controlled by controlling the opening and closing of the air intake valve 123, which is convenient for use.

[0067] In some embodiments, the exhaust assembly 130 includes an exhaust main pipe 131, a plurality of exhaust branch pipes 132, and a plurality of exhaust valves 133. One end of each of the plurality of exhaust branch pipes 132 is connected to the exhaust main pipe 131, and the other end is connected to the top end of each of the plurality of compressed gas storage tanks 110. The plurality of exhaust valves 133 are respectively disposed on the plurality of exhaust branch pipes 132 in a one-to-one correspondence.

[0068] The control device is electrically connected to the plurality of exhaust valves 133, respectively, and is used to control the opening and closing of the plurality of exhaust valves 133 according to a first preset sequence. That is, when the gas-liquid isolation type gas compression device 100 is switched to the gas discharge state, the control device controls the plurality of exhaust valves 133 to be closed simultaneously, so as to close all exhaust passages simultaneously; when the gas-liquid isolation type gas compression device 100 is switched to the nth compression state, the control device can selectively control the exhaust valve 133 corresponding to the compressed gas storage tank 110 filled with the gas to be compressed in the nth group of compressed gas storage tanks 110 and the exhaust valve 133 corresponding to the compressed gas storage tank 110 filled with the gas to be compressed in the n+1th group of compressed gas storage tanks 110 to be opened simultaneously and control the remaining exhaust valves 133 to be closed, so as to open the exhaust passage between the compressed gas storage tank 110 filled with the gas to be compressed in the nth group of compressed gas storage tanks 110 and the compressed gas storage tank 110 filled with the gas to be compressed in the n+1th group of compressed gas storage tanks 110.

[0069] That is, the exhaust branch pipe 132 corresponding to the compressed air tank 110 filled with gas to be compressed in the nth group of compressed air tanks 110, the exhaust main pipe 131, and the exhaust branch pipe 132 corresponding to the compressed air tank 110 filled with gas to be compressed in the n+1th group of compressed air tanks 110 are connected in sequence to form an exhaust passage between the nth group of compressed air tanks 110 and the n+1th group of compressed air tanks 110.

[0070] Therefore, in actual use, the control device controls the on / off of the exhaust passage by controlling the opening and closing of the exhaust valve 133. The exhaust assembly 130 is configured as an exhaust main pipe 131, a plurality of exhaust branch pipes 132 connected to the exhaust main pipe 131, and an exhaust valve 133 corresponding to each exhaust branch pipe 132. It is sufficient to open an opening for exhaust on the compressed gas storage tank 110. While ensuring that the compressed gas storage tank 110 has a high pressure bearing capacity, the structure of the exhaust assembly 130 is also simplified.

[0071] In this way, when only one air inlet and outlet 111 is opened at the top of the compressed air storage tank 110, the air inlet branch pipe 122 and the air exhaust branch pipe 132 can be connected to the air inlet and outlet 111 at the same time through a three-way joint or a connecting pipe to ensure that there are as few holes as possible on the compressed air storage tank 110, so that the air tightness and pressure resistance of the compressed air storage tank 110 are relatively high.

[0072] Of course, in other embodiments, two groups of compressed gas storage tanks 110 with adjacent pressure bearing capacities may be connected through an independent exhaust pipe, and an exhaust valve 133 may be provided on the exhaust pipe, that is, the exhaust assembly 130 may be composed of multiple independent exhaust pipes and exhaust valves 133 provided on the exhaust pipes.

[0073] Furthermore, in some embodiments, the exhaust assembly 130 further includes an air supply pipe 134 and an air supply valve 135 disposed on the air supply pipe 134. One end of the air supply pipe 134 is connected to an exhaust branch pipe 132 and / or an exhaust main pipe 131 connected to the compressed air storage tank 110 with the largest pressure bearing capacity. The control device is electrically connected to the air supply valve 135.

[0074] Specifically, when it is necessary to supply the compressed gas in the compressed gas tank with the largest pressure-bearing capacity to the outside, it is necessary to open the air supply valve 135 and close all the exhaust valves 133 at the same time; when the gas-liquid isolation gas compression equipment 100 is in the gas unloading state, it is necessary to close the air supply valve 135 and all the exhaust valves 133 at the same time, and open the air intake valve 1213 corresponding to at least one compressed gas tank 110 in each group; when the gas-liquid isolation gas compression equipment 100 is in the nth compression state, it is necessary to close the air supply valve 100 and all the air intake valves 123, and open the exhaust valve 133 corresponding to the compressed gas tank 110 filled with gas to be compressed in the nth group of compressed gas tanks 110 and the exhaust valve 133 corresponding to the compressed gas tank 110 filled with gas to be compressed in the n+1th group of compressed gas tanks 110, and close the remaining exhaust valves 133.

[0075] In this way, the gas supply work to the gas-consuming equipment can be achieved without adding any holes on the compressed gas storage tank 110 with the largest pressure-bearing capacity, which not only makes the gas supply work convenient, but also reduces the number of holes punched on the compressed gas storage tank 110 as much as possible. The fewer the openings on the compressed gas storage tank 110, the better its air tightness and pressure-bearing capacity, which is conducive to further reducing the manufacturing cost of the compressed gas storage tank 110.

[0076] In some embodiments, the liquid adding and liquid returning assembly 140 includes a liquid reservoir, a liquid inlet main pipe 142, a plurality of liquid inlet branch pipes 143 connected to the liquid inlet main pipe 142, a liquid return main pipe 144, a plurality of liquid return branch pipes 145 connected to the liquid return main pipe 144, a plurality of liquid inlet valves 146, a plurality of liquid return valves 147, and a liquid infusion device 148. The liquid infusion device 148 may be a water pump, a hydraulic pump, etc., as long as it is a device that can provide power for the liquid in the liquid injection path.

[0077] One end of the main liquid inlet pipe 142 away from the branch liquid inlet pipe 143 rises to the bottom of the liquid reservoir. The infusion device 148 is arranged on the main liquid inlet pipe 142 and is used to provide power for the liquid in the main liquid inlet pipe 142. One end of the plurality of branch liquid inlet pipes 143 away from the main liquid inlet pipe 142 is connected to the bottom of the other compressed gas storage tanks 110 except the compressed gas storage tank 110 with the largest pressure bearing capacity in a one-to-one correspondence. The plurality of liquid inlet valves 146 are respectively arranged on the plurality of branch liquid inlet pipes 143 in a one-to-one correspondence.

[0078] One end of the liquid return main pipe 144 away from the liquid return branch pipe 145 is connected to the liquid storage tank. One end of the multiple liquid return branch pipes 145 away from the liquid return main pipe 144 is connected to the bottom of the compressed gas storage tanks 110 other than the compressed gas storage tank 110 with the largest pressure bearing capacity. Multiple liquid return valves 147 are respectively provided on the multiple liquid return branch pipes 145 in a one-to-one correspondence.

[0079] The control device is electrically connected to the infusion device 148, the plurality of inlet valves 146 and the plurality of liquid return valves 147, respectively, and is used to control the infusion device 148, the plurality of inlet valves 146 and the plurality of liquid return valves 147 to open and close according to a second preset sequence. When in the gas unloading state, the infusion device 148 and all the inlet valves 146 are in a closed state, and the liquid return valve 147 corresponding to at least one compressed gas storage tank 110 in each group of compressed gas storage tanks 110 is in an open state. When in the nth gas compression state, the infusion device 148 is in an open state, and all the inlet valves 146 corresponding to the compressed gas storage tank 110 of the nth group of compressed gas storage tanks 110 filled with gas to be compressed are in an open state, and the remaining inlet valves 146 are in a closed state, and all the liquid return valves 147 are in a closed state.

[0080] When gas unloading is required, the control device controls the air inlet valve 123 and the corresponding liquid return valve 147 corresponding to at least one compressed gas tank 110 in each group of compressed gas tanks 110 to open, so as to ensure that when the gas to be compressed in the transportation equipment enters the compressed gas tank 110, the liquid in each group of compressed gas tanks 110 except for the group of compressed gas tanks 110 with the largest pressure bearing capacity will flow back to the liquid storage tank 141 through the liquid return pipe.

[0081] When the nth gas compression operation is required, the control device controls the infusion device 148 to start, and at the same time controls the liquid inlet valve 146 and the corresponding exhaust valve 133 corresponding to the compressed gas tank 110 of the nth group of compressed gas tanks 110 filled with gas to be compressed, and the exhaust valve 133 corresponding to the compressed gas tank 110 of the n+1th group of compressed gas tanks 110 filled with gas to be compressed to open, so that the liquid in the liquid storage tank 141 is sucked into all the compressed gas tanks 110 of the nth group of compressed gas tanks 110 through the liquid inlet pipe by the infusion device 148, so as to compress the gas in the nth group of compressed gas tanks 110, and inject the compressed gas into the compressed gas tank 110 of the n+1th group of compressed gas tanks 110 filled with gas to be compressed.

[0082] When gas supply is required, the control device controls the infusion device 148 to be closed, all the air inlet valves 123, all the exhaust valves 133, all the liquid inlet valves 146, and all the liquid return valves 147 to be closed, and controls the air supply valve 135 to be opened to ensure that the high-pressure gas in the compressed gas storage tank 110 with the largest pressure-bearing capacity can be discharged through the exhaust branch pipe 132 and the air supply pipe 134.

[0083] The utility model also provides a gas-liquid isolation type gas compression device 100, whose structure is the same as the above gas-liquid isolation type gas compression device 100, and the difference is only that the preset control instructions when the control device is working are different. Specifically, the gas-liquid isolation type gas compression device 100 includes at least three groups of compressed gas storage tanks 110, an air intake component 120, an exhaust component 130, a liquid adding and returning component 140 and a control device (not shown).

[0084] The pressure bearing capacity of at least three groups of compressed gas storage tanks 110 decreases one by one. Multiple groups of compressed gas storage tanks 110 are defined as the nth group of compressed gas storage tanks 110 in the order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of compressed gas storage tanks 110. That is, the pressure bearing capacity of the first group of compressed gas storage tanks 110 is the smallest, and the pressure bearing capacity of the last group of compressed gas storage tanks 110 is the largest, and the pressure bearing capacity of multiple groups of compressed gas storage tanks 110 is different from each other. Among them, the compressed gas storage tank 110 can be a hollow container in the shape of a sphere, an ellipsoid, a three-dimensional rectangle, a cylinder, etc., as long as it can withstand high pressure and has good airtightness.

[0085] It should be noted that a group of compressed air storage tanks 110 may include only one compressed air storage tank 110 or may include multiple compressed air storage tanks 110 , and the number of compressed air storage tanks 110 in multiple groups of compressed air storage tanks 110 may be the same or different.

[0086] The air intake assembly 120 is respectively connected to the top end of each compressed air storage tank 110 in the plurality of compressed air storage tanks 110, and is configured to open or close the air intake passage (not shown) between the air intake assembly 120 and all compressed air storage tanks 110. That is, the air intake assembly has a plurality of air intake passages for charging gas into the plurality of compressed air storage tanks 110 one by one.

[0087] The exhaust assembly 130 is respectively connected to the top end of each compressed air tank 110 in the plurality of compressed air tanks 110, and is configured to selectively open the exhaust passage (not labeled in the figure) between the nth compressed air tank 110 and the n+1th compressed air tank 110, and simultaneously close the exhaust passages (not labeled in the figure) between all other compressed air tanks 110. That is, the exhaust assembly 130 has a plurality of exhaust passages, and the exhaust passage corresponding to the first group of compressed air tanks 110 is used to connect the first group of compressed air tanks 110 and the second group of compressed air tanks 110. Similarly, the exhaust passage corresponding to the nth group of compressed air tanks 110 is used to connect the nth group of compressed air tanks 110 and the n+1th group of compressed air tanks 110.

[0088] The liquid adding and liquid returning assembly 140 is respectively connected to the bottom ends of the other compressed gas storage tanks 110 other than the group of compressed gas storage tanks 110 with the largest pressure bearing capacity, and has a liquid injection passage (not marked in the figure) that can respectively inject liquid into the multiple groups of compressed gas storage tanks 110 and a liquid return passage (not marked in the figure) that allows the liquid in the compressed gas storage tanks 110 to flow out. That is, the liquid adding and liquid returning assembly 140 is not connected to the compressed gas storage tank 110 with the largest pressure bearing capacity. In other words, the compressed gas storage tank 110 with the largest pressure bearing capacity can only be used to compress gas and store high-pressure gas, and liquid will not be injected into the compressed gas storage tank 110 with the largest pressure bearing capacity.

[0089] The control device is constructed to be able to control the opening and closing of each passage in the air intake assembly 120, the air exhaust assembly 130 and the liquid adding and returning assembly 140 respectively, so as to switch the working state of the gas-liquid isolation type gas compression device 100 to the first gas discharge state and the nth gas compression state in sequence, and switch in order from small to large until n=the number of groups of the compressed gas storage tank 110-1. That is, under the action of the control device, the working state of the gas-isolated gas compression device can be automatically switched to the first gas discharge state, the first gas compression state...the nth gas compression state, where n is the number of groups of the compressed gas storage tank 110-1. In this way, the control device realizes the automatic switching of the working state of the gas-liquid isolation type gas compression device 100 by controlling the operation of the air intake assembly 120, the air exhaust assembly 130 and the liquid adding and returning assembly 140.

[0090] When the gas-liquid isolation gas compression device 100 is in the initial gas unloading state, the air intake passage and liquid return passage of at least one compressed gas storage tank 110 in each group of compressed gas storage tanks 110 are in an open state, and all exhaust passages and all liquid injection passages are in a closed state.

[0091] When the gas-liquid isolation gas compression device 100 is in the nth gas compression state, the liquid injection passage corresponding to the compressed gas tank 110 filled with gas to be compressed in the nth group of compressed gas tanks 110 is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank 110 filled with gas to be compressed in the nth group of compressed gas tanks 110 and the compressed gas tank 110 filled with gas to be compressed in the n+1th group of compressed gas tanks 110 is in an open state, and the other exhaust passages are in a closed state, the air intake passage and the corresponding liquid return passage corresponding to at least one compressed gas tank 110 in the n-1th group of compressed gas tanks 110 are in an open state, and the other air intake passages and liquid return passages are in a closed state.

[0092] For ease of understanding, the working process of the gas-liquid isolation type gas compression device 100 is briefly described below:

[0093] First gas unloading process: connect the gas inlet assembly 120 to the gas storage tank of the transport equipment, and automatically switch the working state of the gas-liquid isolation type gas compression device 100 to the first gas unloading state, at which time the gas to be compressed in the transport equipment enters the corresponding compressed gas storage tank 110 through the gas inlet passage corresponding to at least one compressed gas storage tank 110 in each group of compressed gas storage tanks 110, so as to realize the gas unloading work of the gas to be compressed in the transport equipment;

[0094] The first gas compression process: the air intake assembly 120 is disassembled from the transportation equipment, and the working state of the gas-liquid isolation type gas compression device 100 is automatically switched to the first gas compression state. At this time, the liquid adding and returning assembly 140 injects pressure liquid into the compressed gas storage tank 110 filled with the gas to be compressed in the first group of compressed gas storage tanks 110 to compress the gas in the first group of compressed gas storage tanks 110. At the same time, under the push of the pressure liquid, the gas in the first group of compressed gas storage tanks 110 is pressed into the compressed gas storage tank 110 filled with the gas to be compressed in the second group of compressed gas storage tanks 110, until all the gas in the first group of compressed gas storage tanks 110 enters the second group of compressed gas storage tanks 110;

[0095] …

[0096] The nth gas compression process: the working state of the gas-liquid isolation gas compression device 100 is automatically switched to the nth gas compression state, at which time the liquid adding and liquid returning component 140 injects pressurized liquid into the compressed gas tank 110 filled with the gas to be compressed in the nth group of compressed gas tanks 110, so as to compress the gas in the nth group of compressed gas tanks 110, and at the same time, under the driving action of the pressurized liquid, the gas in the nth group of compressed gas tanks 110 is pressed into the compressed gas tank 110 filled with the gas to be compressed in the n+1th group of compressed gas tanks 110, until all the gas in the nth group of compressed gas tanks 110 enters the n+1th group of compressed gas tanks 110, and at the same time, the air intake component 120 injects the gas to be compressed into at least one compressed gas tank 110 in the n-1th group of compressed gas tanks 110, and discharges the liquid in the corresponding compressed gas tank 110 in the n-1th group of compressed gas tanks 110 through the corresponding liquid return passage;

[0097] …

[0098] The last gas compression process: the working state of the gas-liquid isolation gas compression device 100 is automatically switched to the (number of compressed gas transmission tank groups-1)th gas compression state. At this time, the liquid adding and liquid returning component 140 injects pressurized liquid into the compressed gas storage tank 110 filled with the gas to be compressed in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity, so as to compress the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity. At the same time, under the driving effect of the pressurized liquid, the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity is pressed into the compressed gas storage tank 110 with the largest pressure bearing capacity, until all the gas in the group of compressed gas storage tanks 110 with the second largest pressure bearing capacity enters the compressed gas storage tank 110 with the largest pressure bearing capacity. At the same time, the air intake component 120 is used to inject the gas to be compressed into at least one compressed gas storage tank 110 in the group of compressed gas storage tanks 110 with the third largest pressure bearing capacity, and the liquid in the corresponding compressed gas storage tank 110 in the group of compressed gas storage tanks 110 with the third largest pressure bearing capacity is discharged through the corresponding liquid return passage.

[0099] It should be noted that when all the gases to be compressed are compressed and stored in the compressed gas storage tank 110 with the largest pressure-bearing capacity, all the compressed gas storage tanks 110 except the compressed gas storage tank 110 with the largest pressure-bearing capacity are filled with liquid; in this way, when the next gas unloading operation is carried out, the liquid in the compressed gas storage tank 110 will be gradually discharged through the liquid return passage as the gas to be compressed enters, thereby ensuring the purity of the gas to be compressed in the compressed gas storage tank 110.

[0100] Therefore, all compressed gas storage tanks 110 in the gas-liquid isolation gas compression device 100 have the functions of gas storage and gas compression. In practical applications, the number and volume of compressed gas storage tanks 110 can be selected according to the gas transport volume of the transport equipment and the pressure requirement of the compressed gas.

[0101] The gas-liquid isolation type gas compression device 100 can be switched to the nth gas compression state (n=1, 2... the number of compressed gas storage tanks 110 - 1) in sequence, so that the gas in the nth group of compressed gas storage tanks 110 can be compressed in sequence by injecting pressure liquid, and at the same time, the compressed gas in the nth group of compressed gas storage tanks 110 will be squeezed into the n+1th group of compressed gas storage tanks 110, so as to realize multiple superimposed compression of the compressed gas (i.e., the gas in the first group of compressed gas transmission tanks 110 is compressed and then sent to the second group of compressed gas transmission tanks 110). The gas in the second group of compressed gas transmission tanks 110 is then compressed and sent to the third group of compressed gas storage tanks 110... Finally, the gas in the compressed gas storage tank 110 with the second largest pressure bearing capacity is compressed and sent to the compressed gas storage tank 110 with the largest pressure bearing capacity). Therefore, only the compressed gas storage tank 110 with the largest pressure bearing capacity is required to meet the pressure requirement during gas storage, and the pressure bearing capacities of the remaining compressed gas storage tanks 110 are all less than the pressure requirement during gas storage, and decrease in order from large to small according to n.

[0102] In the manufacture of pressure vessels, the manufacturing cost of high-pressure vessels will rise sharply with the increase of pressure bearing capacity. Therefore, selecting a compressed gas storage tank 110 with a smaller pressure bearing capacity can greatly reduce the manufacturing cost of each compressed gas storage tank 110. The compressed gas storage tank 110 with the largest pressure bearing capacity is used to store high-pressure gas that meets the pressure requirements, so it is smaller in size. Compared with the traditional gas compression equipment, the high-pressure gas storage container and the gas compression container are independently set, and both need to meet the pressure requirements during gas storage. The multiple groups of compressed gas storage tanks 110 with different pressure bearing capacities in the utility model and with gas storage and gas compression functions can effectively reduce the manufacturing cost of the gas-liquid isolation gas compression equipment 100, thereby further reducing the storage cost of the gas.

[0103] At the same time, while the nth group of compressed gas storage tanks 110 is performing gas compression, the gas to be compressed can be filled into the n-1th group of compressed gas storage tanks 110, so that while the current group of compressed gas storage tanks 110 is performing gas compression, the gas to be compressed can be injected into the previous group of compressed gas storage tanks 110, which is beneficial to improving the gas storage efficiency of the hydrogen filling station.

[0104] Therefore, the use of the above-mentioned gas-liquid isolation type gas compression device 100 can effectively reduce the gas storage cost of the hydrogen refueling station and improve the storage efficiency of the hydrogen refueling station.

[0105] It should be noted that the difference between the two gas-liquid isolation type gas compression devices provided by the utility model is only the difference in the preset control instructions in the control device, and the preset control instructions are only used for the control device to control the various passages in the air intake component 120, the exhaust component 130 and the liquid addition and return component 140 to be turned on and off in a certain order, that is, the control device controls the various passages in the above two gas-liquid isolation type gas compression devices 100 to be turned on and off in different orders according to two different preset control instructions. The above preset control instructions that can control the various passages to be turned on and off in a certain order are very easy to implement in the prior art, so they are not described in detail here.

[0106] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A gas-liquid isolation gas compression device, characterized in that: include: At least three groups of compressed gas storage tanks, whose pressure bearing capacity decreases in sequence; the multiple groups of compressed gas storage tanks are defined as the nth group of compressed gas storage tanks in the order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of groups of compressed gas storage tanks; An air intake assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to open or close an air intake passage between the air intake assembly and all of the compressed air storage tanks; an exhaust assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to selectively open an exhaust passage between the nth group of compressed air storage tanks and the n+1th group of compressed air storage tanks, and simultaneously close an exhaust passage between all other compressed air storage tanks; Liquid adding and liquid returning components are respectively connected to the bottom ends of the compressed gas storage tanks other than the group of compressed gas storage tanks with the largest pressure bearing capacity, and have liquid injection passages capable of respectively injecting liquid into the multiple groups of compressed gas storage tanks and liquid returning passages for allowing the liquid in the compressed gas storage tanks to flow out; The control device is configured to control the opening and closing of each passage in the air intake assembly, the air exhaust assembly and the liquid adding and returning assembly respectively, so as to switch the working state of the gas-liquid isolation type gas compression device to the gas discharge state and the nth gas compression state in sequence, and switch in order from small to large n, until n=the number of groups of the compressed gas storage tanks-1; When in the gas unloading state, the air intake passage and liquid return passage of at least one of the compressed air storage tanks in each group are in an open state, and all the exhaust passages and all the liquid injection passages are in a closed state; When in the nth gas compression state, all the air intake passages and all the liquid return passages are in a closed state, the liquid injection passage corresponding to the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks and the compressed gas tank filled with gas to be compressed in the n+1th group of compressed gas tanks is in an open state, and the other exhaust passages are in a closed state.

2. The gas-liquid isolation type gas compression equipment according to claim 1, characterized in that: An air inlet and an air outlet are provided at the top of each compressed air storage tank; each of the air inlet and an air outlet is respectively connected to the corresponding air intake passage in the air intake component and the corresponding exhaust passage in the exhaust component.

3. The gas-liquid isolation type gas compression equipment according to claim 1, characterized in that: Except for a group of compressed gas storage tanks with the largest pressure bearing capacity, liquid inlets and outlets are provided at the bottom ends of all other compressed gas storage tanks; each of the liquid inlets and outlets is respectively connected to the corresponding liquid injection passage and the corresponding liquid return passage.

4. The gas-liquid isolation type gas compression device according to claim 1, characterized in that: The air intake assembly includes an air intake main pipe, multiple air intake branch pipes and multiple air intake valves; one end of the multiple air intake main pipes are connected to the air intake main pipe, and the other end are connected to the top ends of the multiple compressed air storage tanks one by one; the multiple air intake valves are arranged one by one on the multiple air intake branch pipes; the control device is electrically connected to the multiple air intake valves, respectively, and is used to control the multiple air intake valves to be closed or opened at the same time.

5. The gas-liquid isolation type gas compression device according to claim 4, characterized in that: The air intake main pipe is also provided with an air intake main valve.

6. The gas-liquid isolation type gas compression device according to claim 1, characterized in that: The exhaust assembly includes an exhaust main pipe, a plurality of exhaust branch pipes and a plurality of exhaust valves; one end of each of the plurality of exhaust branch pipes is connected to the exhaust main pipe, and the other end is connected to the top of each of the plurality of compressed air storage tanks; the plurality of exhaust valves are respectively arranged on the plurality of exhaust branch pipes in a one-to-one correspondence; The control device is electrically connected to the plurality of exhaust valves respectively, and is used to control the plurality of exhaust valves to open and close according to a first preset sequence.

7. The gas-liquid isolation type gas compression device according to claim 6, characterized in that: The exhaust assembly also includes an air supply pipe and an air supply valve arranged on the air supply pipe; one end of the air supply pipe is connected to the exhaust branch pipe and / or the exhaust main pipe connected to the compressed air storage tank with the largest pressure-bearing capacity; the control device is electrically connected to the air supply valve.

8. The gas-liquid isolation type gas compression device according to claim 1, characterized in that: The liquid adding and liquid returning assembly comprises a liquid storage tank, a liquid inlet main pipe, a plurality of liquid inlet branch pipes connected to the liquid inlet main pipe, a liquid return main pipe, a plurality of liquid return branch pipes connected to the liquid return main pipe, a plurality of liquid inlet valves, a plurality of liquid return valves and a liquid infusion device; One end of the main liquid inlet pipe away from the branch liquid inlet pipe rises to the bottom of the liquid storage tank; the liquid infusion device is arranged on the main liquid inlet pipe and is used to provide power for the liquid in the main liquid inlet pipe; one end of the plurality of branch liquid inlet pipes away from the main liquid inlet pipe is respectively connected to the bottom of the other compressed gas storage tanks except the compressed gas storage tank with the largest pressure bearing capacity in a one-to-one correspondence; the plurality of liquid inlet valves are respectively arranged on the plurality of branch liquid inlet pipes in a one-to-one correspondence; One end of the liquid return main pipe away from the liquid return branch pipe is connected to the liquid storage tank; one end of the plurality of liquid return branch pipes away from the liquid return main pipe is connected to the bottom of the other compressed gas storage tanks except the compressed gas storage tank with the largest pressure bearing capacity in a one-to-one correspondence; and the plurality of liquid return valves are respectively and one-to-one correspondingly arranged on the plurality of liquid return branch pipes; The control device is electrically connected to the infusion device, the plurality of liquid inlet valves and the plurality of liquid return valves respectively, and is used to control the infusion device, the plurality of liquid inlet valves and the plurality of liquid return valves to open and close according to a second preset sequence.

9. A gas-liquid isolation gas compression device, characterized in that: include: At least three groups of compressed gas storage tanks, whose pressure bearing capacity decreases in sequence; the multiple groups of compressed gas storage tanks are defined as the nth group of compressed gas storage tanks in the order of pressure bearing capacity from small to large, and n satisfies the following relationship: n=1, 2..., and n≤the number of groups of compressed gas storage tanks; An air intake assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to open or close an air intake passage between the air intake assembly and all of the compressed air storage tanks; an exhaust assembly, connected to the top end of each of the plurality of groups of compressed air storage tanks, and configured to selectively open an exhaust passage between the nth group of compressed air storage tanks and the n+1th group of compressed air storage tanks, and simultaneously close an exhaust passage between all other compressed air storage tanks; Liquid adding and liquid returning components are respectively connected to the bottom ends of the compressed gas storage tanks other than the group of compressed gas storage tanks with the largest pressure bearing capacity, and have liquid injection passages capable of respectively injecting liquid into the multiple groups of compressed gas storage tanks and liquid returning passages for allowing the liquid in the compressed gas storage tanks to flow out; The control device is configured to control the opening and closing of each passage in the air intake assembly, the air exhaust assembly and the liquid adding and returning assembly respectively, so as to switch the working state of the gas-liquid isolation type gas compression device to the first gas unloading state and the nth gas compression state, and switch in order from small to large n until n=the number of groups of the compressed gas storage tanks-1; In the first gas unloading state, the air intake passage and liquid return passage of at least one of the compressed gas storage tanks in each group are in an open state, and all the exhaust passages and all the liquid injection passages are in a closed state; When in the nth gas compression state, the liquid injection passage corresponding to the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks is in an open state, and the other liquid injection passages are in a closed state, the exhaust passage between the compressed gas tank filled with gas to be compressed in the nth group of compressed gas tanks and the compressed gas tank filled with gas to be compressed in the n+1th group of compressed gas tanks is in an open state, and the other exhaust passages are in a closed state, the air intake passage and the corresponding liquid return passage corresponding to at least one compressed gas tank in the n-1th group of compressed gas tanks are in an open state, and the other air intake passages and the liquid return passages are in a closed state.

Images