Gas storage tank pressure management and control system and management and control method

Abstract

The invention relates to a gas storage tank pressure management and control system and method, the system comprises an exhaust control unit and a pressure management unit, the pressure management unit is used for managing and controlling the pressure of a plurality of gas storage tanks, the exhaust control unit comprises a venturi suction device, the venturi suction device is provided with an exhaust channel and a suction channel, and in the plurality of gas storage tanks, the venturi suction channel is communicated with the exhaust channel. Wherein one air storage tank is only communicated with the air suction channel through a pipeline, and the rest air storage tanks are communicated with the air suction channel through a pipeline and also communicated with the inlet section of the exhaust channel through a pipeline. The pressure management unit is communicated with each gas storage tank through a pipeline, the pressure management unit comprises a gas catalysis device, gas evaporated in the gas storage tanks is discharged into the gas catalysis device, the gas catalysis device is filled with a catalyst capable of reacting with the gas, and the gas is liquefied and stored in the gas catalysis device. The pressure of the air storage tank can be controlled, and the problem that the air storage tank overflows due to too high pressure or the problem that the air storage tank cannot be discharged due to too low pressure is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas storage tank management and control, and in particular to a gas storage tank pressure control system and a control method. Background Art

[0002] LNG (Liquefied Natural Gas) is a liquefied natural gas that is purified and cooled to about -162°C at normal pressure. As a clean energy, LNG has the characteristics of low pollution and low carbon emissions. Its use helps reduce greenhouse gas emissions and improve environmental quality. With the increase in global demand for clean energy, the LNG industry is developing rapidly, including as a peak-shaving gas source for urban pipeline gas supply, vehicle fuel, and distributed energy systems.

[0003] In the field of automotive fuel use, LNG is stored in gas tanks. In daily use, the management and control of gas tanks mainly include: exhaust control and pressure management, including: In terms of exhaust control: the existing gas tanks generally store 700 bar (maximum pressure) of high-pressure gas, and the working pressure of the gas outside the gas tank is about 260 bar. These gases will be released into the engine for combustion to generate energy. After the release, the pressure inside the LNG gas tank will decrease. When the gas pressure inside the LNG gas tank drops to 260 bar or below, due to the high working pressure of the gas outside the gas tank, this part of the gas in the gas tank will not be able to be output to the outside of the gas tank for use by the engine, resulting in low utilization of the gas energy in the LNG gas tank and the storage space of the gas tank cannot be effectively utilized; In terms of pressure management: LNG is stored in double-layer stainless steel tanks at a temperature of about -160℃. Due to the huge temperature difference between the ambient temperature and LNG, heat conduction between the environment and LNG is inevitable at any time. Part of the LNG liquid will evaporate into gas when heated. When the engine is not running for a long time, as the amount of LNG evaporates into gas increases, the pressure in the LNG tank gradually increases. When it exceeds 700bar, the current LNG tanks are equipped with safety valves. When the pressure in the tank reaches the set pressure, methane is discharged into the atmosphere, which is easy to cause air pollution.

[0004] Therefore, when the gas pressure in the existing LNG storage tank is lower than the working pressure of the gas outside the gas tank, the gas tank will not be able to exhaust to the outside, and this part of the gas cannot be used; when the pressure is too high, exceeding the pressure upper limit of 700 bar, the existing LNG storage tank either uses a safety valve to discharge the over-pressure evaporated natural gas into the atmosphere, or passes it into the engine intake duct for combustion, or recovers the over-pressure evaporated natural gas to the gas tank of the filling station when refueling. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem of too high or too low pressure in the gas tank in the prior art, and to provide a gas tank pressure control system and a control method. On the one hand, the exhaust efficiency of the gas tank can be improved, and the gas tank can be exhausted when the pressure is too low. On the other hand, the pressure of the gas tank can be controlled. When the pressure is too high, the pressure in the gas tank can be reduced without causing waste.

[0006] In order to solve the above technical problems, the present invention provides a gas tank pressure control system, including: an exhaust control unit and a pressure management unit, which are used to control the pressure of multiple gas tanks, wherein: The exhaust control unit comprises a Venturi air intake device, the Venturi air intake device comprises a Venturi tube, the Venturi tube has an exhaust passage and an air intake passage, the exhaust passage comprises: an inlet section, a contraction section and an expansion section, the air intake passage is connected with the contraction section through a pipeline, among a plurality of air storage tanks, one of the air storage tanks is only connected with the air intake passage through a pipeline, and the remaining air storage tanks are not only connected with the air intake passage through a pipeline, but also connected with the inlet section of the exhaust passage through a pipeline; The pressure management unit is connected to each of the gas storage tanks through a pipeline. The pressure management unit includes a gas catalytic device. The evaporated gas in the gas storage tank is discharged into the gas catalytic device. The gas catalytic device is filled with a catalyst that can react with the gas. The catalyst reacts with the gas to liquefy the gas and store it in the gas catalytic device.

[0007] In one embodiment of the present invention, the number of the gas storage tanks is 3 to 5.

[0008] In one embodiment of the present invention, the Venturi suction device further comprises: a housing, wherein the venturi tube is disposed in the housing; A first one-way intake valve assembly is disposed in the housing, the first one-way intake valve assembly is connected to the inlet section of the exhaust passage through a pipeline, and the first one-way intake valve assembly controls gas to enter only from the inlet section; The second one-way air intake valve assembly is arranged in the housing. The second one-way air intake valve assembly is connected to the inlet section of the air intake passage through a pipeline. The one-way air intake valve assembly controls the gas to enter only from the air intake passage.

[0009] In one embodiment of the present invention, the first one-way air intake valve assembly and the second one-way air intake valve assembly both include: A valve plug and an elastic member, wherein the elastic member elastically supports the valve plug to block the air inlet; When the gas flows from the valve plug toward the elastic member, the gas pushes the valve plug to compress the elastic member, the valve plug is separated from the air inlet, the air inlet is opened, and the gas passes through; When the gas flows from the elastic member toward the valve plug, the gas pushes the valve plug to block the air inlet.

[0010] In one embodiment of the present invention, a switch check valve is provided on the pipeline between the gas storage tank and the Venturi suction device.

[0011] In one embodiment of the present invention, the exhaust control unit further includes an accumulator, which is connected to the expansion section of the exhaust channel through a pipeline, and the gas in the gas storage tank is discharged into the accumulator, and a pressure sensor is provided on the accumulator.

[0012] In one embodiment of the present invention, the gas storage tank stores liquefied natural gas or hydrogen.

[0013] In one embodiment of the present invention, the pressure management unit includes an air intake pipe connecting the gas storage tank and the gas catalytic device, the air intake pipe extends into the interior of the gas storage tank, and the air intake pipe is arranged at the highest point of the gas phase space inside the gas storage tank.

[0014] In one embodiment of the present invention, a switch control valve is further provided on the connecting pipeline between the gas storage tank and the gas catalytic device.

[0015] In one embodiment of the present invention, the switch control valve is a pressure control valve, which can be automatically started according to the gas pressure in the gas storage tank.

[0016] In one embodiment of the present invention, the gas catalytic device has a discharge port.

[0017] In one embodiment of the present invention, a liquid level detection sensor is provided in the gas catalytic device.

[0018] In one embodiment of the present invention, a water cooling system is provided in the gas catalytic device, and the temperature of the gas catalytic device is controlled by the water cooling system.

[0019] In one embodiment of the present invention, which is applied in the field of automobile air supply, the coolant of the automobile engine can be introduced into the water cooling system.

[0020] In order to solve the above technical problems, the present invention also provides a gas tank pressure control method, which is implemented by applying the above gas tank pressure control system, and includes the following steps: When the gas tank is in normal use: S101, determining the number of gas storage tanks, opening the first gas storage tank, allowing the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharging the gas in the first gas storage tank into the accumulator, and when the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank; S102, opening the second gas tank, allowing the gas in the second gas tank to enter from the exhaust passage of the venturi tube, and discharging the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section of the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the intake passage of the venturi tube into the accumulator. S103, referring to step S102, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together; When the gas tank is not in use: S201, the pressure in the gas storage tank is continuously increased, and when a pressure difference is formed between the gas storage tank and the gas catalytic device, when the pressure difference reaches a threshold control pressure, the gas catalytic device is controlled to be connected with the gas storage tank, and the gas in the gas storage tank is introduced into the gas catalytic device to balance the pressure between the gas storage tank and the gas catalytic device; S202, after the pressure is balanced, the gas catalytic device is controlled to be disconnected from the gas storage tank, the gas is liquefied in the gas catalytic device, the pressure is reduced, and a pressure difference is formed between the gas storage tank and the gas catalytic device again; S203, controlling the gas catalytic device to be connected to the gas storage tank again, introducing the gas in the gas storage tank into the gas catalytic device, so that the pressure between the gas storage tank and the gas catalytic device is balanced, and repeating the above step S202 until the pressure difference between the gas storage tank and the gas catalytic device is lower than the threshold control pressure.

[0021] The above technical solution of the present invention has the following advantages compared with the prior art: The gas tank pressure control system and control method described in the present invention can control the pressure of the gas tank: First, the air intake characteristic of the venturi tube is used to realize the exhaust control of the gas tank. Multiple gas tanks are connected to the exhaust channel and the intake channel of the venturi tube respectively. The gas in the previous gas tank is discharged normally through the venturi tube first. When the gas pressure in the gas tank is equal to or lower than the use pressure, a certain amount of gas remains in the gas tank. At this time, the gas in the next gas tank is opened to enter through the exhaust channel of the venturi tube. When the gas in the next gas tank passes through the contraction section in the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the previous gas tank is adsorbed and discharged from the intake channel of the venturi tube to achieve the effect of secondary exhaust. At this time, even if the gas pressure in the previous gas tank is lower than the use pressure, it can be discharged, so that the gas can be discharged when the pressure of the gas tank is relatively low, which can improve the utilization rate of the gas energy in the gas tank and effectively utilize the storage space of the gas tank. Secondly, the gas catalytic device can react chemically with the gas in the gas tank. When the gas pressure in the gas tank is too high, the gas is controlled to be discharged into the gas catalytic device, and liquefied and recovered in the gas catalytic device. This can reduce the pressure in the gas tank without causing waste, and at the same time prevent the gas from being discharged into the air, thereby avoiding air pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 It is a structural schematic diagram of the gas tank pressure control system of the present invention; Figure 2 It is a structural schematic diagram of a pressure management unit in the gas tank pressure control system of the present invention; Figure 3 It is a schematic structural diagram of the Venturi suction device of the present invention; Figure 4 It is a flow chart of the steps of exhaust control of the gas storage tank pressure control method of the present invention; Figure 5 It is a flow chart of the steps of pressure management of the gas tank pressure control method of the present invention.

[0023] Explanation of the reference numerals in the specification: 1. Gas storage tank; 2. Exhaust control unit; 21. Venturi suction device; 211. Venturi tube; 212. Shell; 213. First one-way intake valve assembly; 214. Second one-way intake valve assembly; 22. Switch check valve; 3. Pressure management unit; 31. Gas catalytic device; 32. Intake pipe; 33. Switch control valve. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Example 1

[0025] Reference Figure 1 As shown, the present invention discloses a gas tank pressure control system for realizing the control of the gas pressure in a plurality of gas tanks 1, comprising: an exhaust control unit 2 and a pressure management unit 3, wherein: the exhaust control unit 2 can discharge the gas from the gas tank 1 when the gas pressure in the gas tank 1 is insufficient, thereby improving the utilization rate of the gas energy in the gas tank 1 and effectively utilizing the storage space of the gas tank 1; the pressure management unit 3 can liquefy and recover the gas when the gas pressure in the gas tank 1 is too high, thereby avoiding gas overflow, waste and pollution.

[0026] The exhaust control unit 2 includes a Venturi air intake device 21, and the Venturi air intake device 21 includes a Venturi tube 211. The Venturi tube 211 has an exhaust channel and an air intake channel. The exhaust channel includes: an inlet section, a contraction section, and an expansion section. The air intake channel is connected to the contraction section through a pipeline. Among the multiple air storage tanks 1, one of the air storage tanks 1 is only connected to the air intake channel through a pipeline, and the remaining air storage tanks 1 are not only connected to the air intake channel through pipelines, but also connected to the inlet section of the exhaust channel through pipelines. In this embodiment, the air intake characteristic of the venturi tube 211 is utilized to realize the exhaust control of the gas storage tank 1, and multiple gas storage tanks 1 are respectively connected to the exhaust channel and the intake channel of the venturi tube 211, and the gas in the previous gas storage tank 1 is first discharged normally through the venturi tube 211. When the gas pressure in the gas storage tank 1 is equal to or lower than the use pressure, a certain amount of gas remains in the gas storage tank 1. At this time, the gas in the next gas storage tank 1 is opened to enter through the exhaust channel of the venturi tube 211. When the gas in the next gas storage tank 1 passes through the contraction section in the venturi tube 211, its flow rate increases and the pressure decreases. At this time, the residual gas in the previous gas storage tank 1 is adsorbed and discharged from the intake channel of the venturi tube 211 to achieve the effect of secondary exhaust. At this time, even if the gas pressure in the previous gas storage tank 1 is lower than the use pressure, it can be discharged, so that the gas can be discharged when the pressure of the gas storage tank 1 is relatively low, which can improve the utilization rate of the gas energy in the gas storage tank 1 and effectively utilize the storage space of the gas storage tank 1.

[0027] Reference Figure 1 As shown, in this embodiment, the exhaust control unit 2 of the gas storage tank composed of three gas storage tanks 1 is taken as an example to further illustrate the exhaust control unit 2 of the gas storage tank of the present invention.

[0028] As shown in the figure, in this embodiment, three gas storage tanks 1 are provided, namely, gas storage tank No. 1, gas storage tank No. 2 and gas storage tank No. 3, wherein: Connect the No. 1 gas storage tank to the air inlet passage of the Venturi tube 211 in the Venturi air suction device 21 through a pipeline; The No. 2 gas storage tank is connected to the air inlet channel and the exhaust channel of the venturi tube 211 in the venturi air suction device 21 through pipelines; The No. 3 gas storage tank is connected to the exhaust passage of the Venturi tube 211 in the Venturi air suction device 21 through a pipeline.

[0029] The purpose of using the above-mentioned gas tank 1 exhaust control system is to discharge the gas in gas tanks No. 1, No. 2 and No. 3 into the accumulator for use by the engine. Therefore, the accumulator is connected to the expansion section of the exhaust channel through a pipeline so that the gas in the gas tank 1 is discharged into the accumulator. The specific exhaust process is as follows: First, open the No. 1 gas tank, let the gas in the No. 1 gas tank enter from the suction channel of the venturi tube 211, and discharge the gas in the No. 1 gas tank into the accumulator. When the gas pressure in the No. 1 gas tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the No. 1 gas tank 1; Open the No. 2 gas tank again, so that the gas in the No. 2 gas tank enters from the exhaust passage of the venturi tube 211, and discharges the gas in the No. 2 gas tank into the accumulator. When the gas in the No. 2 gas tank passes through the contraction section in the venturi tube 211, its flow rate increases and the pressure decreases. At this time, the Venturi effect is generated, so that the residual gas in the No. 1 gas tank is adsorbed and discharged from the suction passage of the venturi tube 211 into the accumulator again, so that the residual gas in the No. 1 gas tank is less. When the gas pressure in the No. 2 gas tank is the same as the gas pressure in the accumulator, the exhaust process stops, and the No. 3 gas tank is opened again, so that the gas in the No. 3 gas tank enters from the exhaust passage of the Venturi tube 211, and the gas in the No. 3 gas tank is discharged into the accumulator. When the gas in the No. 3 gas tank passes through the contraction section in the Venturi tube 211, its flow rate increases and the pressure decreases. At this time, the Venturi effect is generated, so that the residual gas in the No. 1 gas tank and the residual gas in the No. 2 gas tank are adsorbed together and discharged from the suction passage of the Venturi tube 211 into the accumulator again, so that the residual gas in the No. 1 gas tank and the No. 2 gas tank is less; It can be seen that now only the gas in gas tank No. 3 has the same pressure as the gas in the accumulator, and the gas pressures in the remaining gas tanks No. 1 and No. 2 are lower than the gas pressure in the accumulator, which solves the problem in the prior art that the gas cannot be discharged when the gas pressure in gas tank 1 is the same as the working pressure. In contrast, in the present invention, part of the gas can be discharged even when the gas pressure in gas tank No. 1 and No. 2 is lower than the working pressure, thereby improving the utilization rate of the gas energy in gas tank 1 and effectively utilizing the storage space of gas tank 1.

[0030] Specifically, according to actual experimental verification, when three gas tanks 1 are set, the gas in gas tank No. 3 enters the accumulator through the exhaust channel of the venturi tube 211. When the gas pressure in gas tank No. 3 is the same as the gas pressure in the accumulator, the gas in gas tank No. 1 has been basically completely passively discharged after two adsorptions of the Venturi effect. Therefore, when the gas tank 1 exhaust control system of the present invention is adopted, when three or more gas tanks 1 are set, the exhaust efficiency is maximized. Theoretically, the more gas tanks 1 are set, the higher the efficiency. However, according to actual usage requirements, as well as application scenarios and floor space distribution, setting 3 to 5 gas tanks 1 in a general vehicle engine is the best configuration, which can both maximize efficiency and meet actual setting conditions.

[0031] In this embodiment, an air tank 1 exhaust control system consisting of three air tanks 1 is provided. To facilitate subsequent expansion, the air tank No. 3 is also connected to the air intake passage of the Venturi tube 211 in the Venturi suction device 21 through a pipeline to facilitate the subsequent increase in the number of air tanks 1.

[0032] Specifically, in order to achieve the communication control between different gas storage tanks 1 and the Venturi tube 211 , a switch check valve 22 is provided on the pipeline between the gas storage tank 1 and the Venturi suction device 21 .

[0033] Specifically, according to actual usage requirements, liquefied natural gas, hydrogen or other combustible gases are stored in the gas storage tank 1 .

[0034] Specifically, when the present invention uses the Venturi tube 211, it is necessary to ensure the unidirectional flow of the airflow, that is, when the airflow enters from the exhaust channel of the Venturi tube 211, it can only flow along the direction from the inlet section, the contraction section to the expansion section, and when the airflow enters from the suction channel of the Venturi tube 211, it can only be discharged from the expansion section; In order to achieve the above-mentioned unidirectional flow, refer to Figure 3As shown, the Venturi air intake device 21 of the present invention also includes: a shell 212, a first one-way air intake valve assembly 213 and a second one-way air intake valve assembly 214, wherein: the Venturi tube 211, the first one-way air intake valve assembly 213 and the second one-way air intake valve assembly 214 are all arranged in the shell 212, the first one-way air intake valve assembly 213 is connected to the inlet section of the exhaust channel through a pipeline, and the first one-way air intake valve assembly 213 controls the gas to enter only from the inlet section, the second one-way air intake valve assembly 214 is connected to the inlet section of the intake channel through a pipeline, and the one-way air intake valve assembly controls the gas to enter only from the intake channel.

[0035] In this embodiment, the first one-way air intake valve assembly 213 and the second one-way air intake valve assembly 214 have similar structures. The first one-way air intake valve assembly 213 and the second one-way air intake valve assembly 214 both include: a valve plug and an elastic member, wherein the elastic member elastically supports the valve plug to block the air inlet; When the gas flows from the valve plug toward the elastic member, the gas pushes the valve plug to compress the elastic member, the valve plug is separated from the air inlet, the air inlet is opened, and the gas passes through; When the gas flows from the elastic member toward the valve plug, the gas pushes the valve plug to block the air inlet.

[0036] Reference Figure 1 and Figure 2 As shown, the pressure management unit 3 is connected to each of the gas storage tanks 1 through a pipeline, and the pressure management unit 3 includes a gas catalytic device 31. The evaporated gas in the gas storage tank 1 is discharged into the gas catalytic device 31. The gas catalytic device 31 is filled with a catalyst that can react with the gas. The catalyst reacts with the gas to liquefy the gas and store it in the gas catalytic device 31. When the gas pressure in the gas storage tank 1 is too high, the gas is controlled to be discharged into the gas catalytic device 31, and is liquefied and recovered in the gas catalytic device 31. Under the premise of not causing waste, the pressure in the gas storage tank 1 can be reduced, and at the same time, the gas can be prevented from being discharged into the air to avoid air pollution.

[0037] Specifically, in the gas tank 1, gas evaporation will exist at the top of the gas tank 1. Therefore, in this embodiment, the pressure management unit 3 includes an intake pipe 32 connecting the gas tank 1 and the gas catalytic device 31, and the intake pipe 32 extends into the interior of the gas tank 1. The intake pipe 32 is set at the highest point of the gas phase space inside the gas tank 1.

[0038] Specifically, a switch control valve 33 is further provided on the air intake pipe 32. In actual use, the switch control valve 33 can be provided in two control modes: First, the switch control valve 33 can be set as a solenoid valve, and a pressure sensor is set in each of the gas storage tanks 1. The pressure in the gas storage tank 1 is detected in real time by the pressure sensor, and a detection threshold of the pressure sensor is set. When the pressure reaches the threshold, an electrical signal is transmitted to the switch control valve 33 through the pressure sensor, thereby controlling the switch of the solenoid valve.

[0039] Second, the switch control valve 33 can be set as a pressure control valve, which can be automatically activated according to the gas pressure in the gas storage tank 1, that is, when the gas storage tank 1 and the gas catalytic device 31 are connected, the switch is realized by the pressure difference between the two. Specifically, the pressure control valve includes: The mechanical pressure control valve can control the pressure in the gas tank 1 at a constant value by setting the spring opening pressure. When the evaporation pressure in the gas tank 1 is higher than the set value, the control valve spring is opened, and the gas in the tank flows to the gas catalyst device 31 through the pressure control valve and is liquefied in the gas catalyst device 31. As more and more gas is liquefied, the evaporation pressure of the gas in the gas tank 1 gradually decreases. When it is lower than the set value of the pressure control valve spring, the pressure control valve automatically closes, thereby always controlling the gas pressure in the gas tank 1 at the set value.

[0040] The electronically controlled pressure control valve can directly set the pressure setting value of the pressure valve, thereby flexibly adjusting the pressure in the gas storage tank 1. The basic principle of pressure regulation is the same as that of the mechanical pressure control valve.

[0041] Specifically, in this embodiment, the gas catalyst device 31 also has a discharge port, and a discharge valve is provided on the discharge port. The discharge pipeline is connected to the recovery box at the discharge port. The discharge port is switched by controlling the discharge valve, so that the liquid liquefied and stored in the gas catalyst device 31 can be recovered.

[0042] Specifically, a liquid level detection sensor is provided in the gas catalyst device 31. When the liquid level detection sensor detects that the liquid in the gas catalyst device 31 reaches the storage threshold, the liquid level detection sensor generates an electrical signal to control the release valve to open, thereby discharging the liquid to prevent the gas catalyst device 31 from being full and causing the gas to be unable to liquefy.

[0043] Specifically, a water cooling system is provided in the gas catalyst device 31. The temperature of the gas catalyst device 31 is controlled by the water cooling system, which can increase the speed of gas liquefaction and optimize the reaction efficiency of the catalyst. When the gas storage tank 1 of the present invention is used in the field of automobile gas supply, the coolant of the automobile engine can be introduced into the water cooling system during actual setting. The engine coolant can provide a temperature of 80-90 degrees Celsius for the gas catalyst device 31 during engine operation, thereby effectively improving the activity of the catalyst.

[0044] Specifically, take the natural gas stored in the gas tank 1 as an example: the main component of natural gas is methane. In the prior art: the single iron center confined in graphene, the coordinated unsaturated single iron and double iron sites confined in the ZSM-5 channel lattice can activate hydrogen peroxide to decompose and produce active Fe-O species, which can effectively activate methane and dissociate carbon-hydrogen bonds, so that methane (the main component of natural gas, molecular formula CH4) is highly selectively oxidized to formic acid (HCOOH) through a free radical mechanism via methanol (CH30H) and formaldehyde (HCHO), and effectively inhibits the production of carbon dioxide. By changing the silicon-aluminum ratio of the ZSM-5 molecular sieve and the catalyst Fe loading, the conversion efficiency is the highest under the condition of 80°C. Therefore, the engine coolant can provide a better conversion environment during engine operation; after the natural gas is catalytically reacted into formic acid, the pressure in the gas catalyst device 31 is greatly reduced, thereby freeing up the necessary space to transfer more natural gas with a pressure higher than that in the gas catalyst device 31 from the gas tank 1 to the gas catalyst device 31 to continue the chemical reaction. Example 2

[0045] Using the gas tank pressure control system of the above embodiment 1, refer to Figure 4-5 As shown, the present invention also discloses a management control method, comprising the following steps: When the gas tank is in normal use: S101, determining the number of gas storage tanks, opening the first gas storage tank, allowing the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharging the gas in the first gas storage tank into the accumulator, and when the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank; S102, opening the second gas tank, allowing the gas in the second gas tank to enter from the exhaust passage of the venturi tube, and discharging the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section of the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the intake passage of the venturi tube into the accumulator. S103, referring to step S102, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together; When the gas tank is not in use: S201, the pressure in the gas storage tank is continuously increased, and when a pressure difference is formed between the gas storage tank and the gas catalytic device, when the pressure difference reaches a threshold control pressure, the gas catalytic device is controlled to be connected with the gas storage tank, and the gas in the gas storage tank is introduced into the gas catalytic device to balance the pressure between the gas storage tank and the gas catalytic device; S202, after the pressure is balanced, the gas catalytic device is controlled to be disconnected from the gas storage tank, the gas is liquefied in the gas catalytic device, the pressure is reduced, and a pressure difference is formed between the gas storage tank and the gas catalytic device again; S203, controlling the gas catalytic device to be connected to the gas storage tank again, introducing the gas in the gas storage tank into the gas catalytic device, so that the pressure between the gas storage tank and the gas catalytic device is balanced, and repeating the above step S202 until the pressure difference between the gas storage tank and the gas catalytic device is lower than the threshold control pressure.

[0046] The specific implementation steps of the gas tank pressure control method of the present invention have been illustrated in Example 1, and will not be repeated here. The gas tank pressure control system of the present invention can control the pressure of the gas tank: When the pressure in a single gas storage tank is insufficient, the gas below the working pressure can be discharged from the gas storage tank through the exhaust control unit, which can improve the utilization rate of the gas energy in the gas storage tank and effectively utilize the storage space of the gas storage tank; When the pressure in a single gas tank is too high, the evaporated gas can be reacted with the catalyst to generate liquid for recovery through the pressure management unit. This can reduce the pressure in the gas tank without causing waste, and can also prevent the gas from being discharged into the air, thus avoiding air pollution.

[0047] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A gas tank pressure control system, characterized in that: include: The exhaust control unit and the pressure management unit are used to control the pressure of multiple gas tanks, including: The exhaust control unit comprises a Venturi air intake device, the Venturi air intake device comprises a Venturi tube, the Venturi tube has an exhaust passage and an air intake passage, the exhaust passage comprises: an inlet section, a contraction section and an expansion section, the air intake passage is connected with the contraction section through a pipeline, among a plurality of air storage tanks, one of the air storage tanks is only connected with the air intake passage through a pipeline, and the remaining air storage tanks are not only connected with the air intake passage through a pipeline, but also connected with the inlet section of the exhaust passage through a pipeline; The pressure management unit is connected to each of the gas storage tanks through a pipeline. The pressure management unit includes a gas catalytic device. The evaporated gas in the gas storage tank is discharged into the gas catalytic device. The gas catalytic device is filled with a catalyst that can react with the gas. The catalyst reacts with the gas to liquefy the gas and store it in the gas catalytic device.

2. The gas tank pressure control system according to claim 1, characterized in that: The number of the gas storage tanks is 3 to 5.

3. The gas tank pressure control system according to claim 1, characterized in that: The venturi suction device also includes: a housing, wherein the venturi tube is disposed in the housing; A first one-way intake valve assembly is disposed in the housing, the first one-way intake valve assembly is connected to the inlet section of the exhaust passage through a pipeline, and the first one-way intake valve assembly controls gas to enter only from the inlet section; The second one-way air intake valve assembly is arranged in the housing. The second one-way air intake valve assembly is connected to the inlet section of the air intake passage through a pipeline. The one-way air intake valve assembly controls the gas to enter only from the air intake passage.

4. The gas tank pressure control system according to claim 3, characterized in that: The first one-way air intake valve assembly and the second one-way air intake valve assembly both include: A valve plug and an elastic member, wherein the elastic member elastically supports the valve plug to block the air inlet; When the gas flows from the valve plug toward the elastic member, the gas pushes the valve plug to compress the elastic member, the valve plug is separated from the air inlet, the air inlet is opened, and the gas passes through; When the gas flows from the elastic member toward the valve plug, the gas pushes the valve plug to block the air inlet.

5. The gas tank pressure control system according to claim 1, characterized in that: A switch check valve is arranged on the pipeline between the gas storage tank and the Venturi air suction device.

6. The gas tank pressure control system according to claim 1, characterized in that: The exhaust control unit also includes an accumulator, which is connected to the expansion section of the exhaust channel through a pipeline, and the gas in the gas storage tank is discharged into the accumulator. The accumulator is provided with a pressure sensor.

7. The gas tank pressure control system according to claim 1, characterized in that: The gas storage tank stores liquefied natural gas or hydrogen.

8. The gas tank pressure control system according to claim 1, characterized in that: The pressure management unit includes an air intake pipe connecting the gas storage tank and the gas catalytic device, the air intake pipe extends into the interior of the gas storage tank, and the air intake pipe is arranged at the highest point of the gas phase space inside the gas storage tank.

9. The gas tank pressure control system according to claim 1, characterized in that: A switch control valve is also arranged on the connecting pipeline between the gas storage tank and the gas catalytic device.

10. The gas tank pressure control system according to claim 9, characterized in that: The switch control valve is a pressure control valve, which can be automatically started according to the gas pressure in the gas storage tank.

11. The gas tank pressure control system according to claim 1, characterized in that: The gas catalytic device has a discharge port.

12. The gas tank pressure control system according to claim 1, characterized in that: A liquid level detection sensor is arranged in the gas catalytic device.

13. The gas tank pressure control system according to claim 1, characterized in that: A water cooling system is provided in the gas catalyst device, and the temperature of the gas catalyst device is controlled by the water cooling system.

14. The gas tank pressure control system according to claim 13, characterized in that: When applied in the field of automobile air supply, the coolant of the automobile engine can be introduced into the water cooling system.

15. A method for controlling the pressure of a gas storage tank, implemented by using the gas storage tank pressure control system according to any one of claims 1 to 14, characterized in that: The following steps are involved: When the gas tank is in normal use: S101, determining the number of gas storage tanks, opening the first gas storage tank, allowing the gas in the first gas storage tank to enter from the air intake channel of the venturi tube, and discharging the gas in the first gas storage tank into the accumulator, and when the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, the exhaust process stops, and a certain amount of gas remains in the first gas storage tank; S102, opening the second gas tank, allowing the gas in the second gas tank to enter from the exhaust passage of the venturi tube, and discharging the gas in the second gas tank into the accumulator. When the gas in the second gas tank passes through the contraction section of the venturi tube, its flow rate increases and the pressure decreases. At this time, the residual gas in the first gas tank is adsorbed and discharged from the intake passage of the venturi tube into the accumulator. S103, referring to step S102, opening subsequent gas storage tanks in sequence, allowing the gas in the subsequent gas storage tank to enter from the exhaust channel of the venturi tube, allowing the residual gas in the previous gas storage tank to be adsorbed and enter from the intake channel of the venturi tube, and the gas in the two gas storage tanks is discharged into the accumulator together; When the gas tank is not in use: S201, the pressure in the gas storage tank is continuously increased, and when a pressure difference is formed between the gas storage tank and the gas catalytic device, when the pressure difference reaches a threshold control pressure, the gas catalytic device is controlled to be connected with the gas storage tank, and the gas in the gas storage tank is introduced into the gas catalytic device to balance the pressure between the gas storage tank and the gas catalytic device; S202, after the pressure is balanced, the gas catalytic device is controlled to be disconnected from the gas storage tank, the gas is liquefied in the gas catalytic device, the pressure is reduced, and a pressure difference is formed between the gas storage tank and the gas catalytic device again; S203, controlling the gas catalytic device to be connected to the gas storage tank again, introducing the gas in the gas storage tank into the gas catalytic device, so that the pressure between the gas storage tank and the gas catalytic device is balanced, and repeating the above step S202 until the pressure difference between the gas storage tank and the gas catalytic device is lower than the threshold control pressure.

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