CN217784844U - Hydraulic direct-charging type supercharging device for CNG (compressed natural gas) automobile gas filling substation - Google Patents
Hydraulic direct-charging type supercharging device for CNG (compressed natural gas) automobile gas filling substation Download PDFInfo
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Abstract
The utility model discloses a hydraulic direct-charging type supercharging device for a CNG automobile gas filling substation, wherein an oil suction filter, a hydraulic pump and a fuel supply pressure adjusting module are arranged on a connecting pipeline at the fuel supply end of a hydraulic fuel tank; an explosion-proof oil return electromagnetic valve is arranged on a connecting pipeline at the oil return end of the hydraulic oil tank; the connecting pipeline at the oil supply end and the connecting pipeline at the oil return end are communicated with the pressurized part through an oil way reversing pneumatic valve group, and the oil way reversing pneumatic valve group controls the hydraulic oil tank to supply oil to the pressurized part or return oil from the pressurized part; an explosion-proof type differential pressure switch is arranged at the top of the hydraulic oil tank to measure the change of differential pressure in the working process of the hydraulic oil tank; the hydraulic oil tank is provided with an oil filtering device and is communicated with the oil filtering device through a connecting pipeline. The technical scheme is used for pressurizing a pressurized part; the hydraulic oil is convenient to pressurize, output and return.
Description
Technical Field
The utility model relates to a gas filling substation, in particular to a hydraulic direct-filling type supercharging device for a CNG automobile gas filling substation.
Background
As a clean and efficient energy source, natural gas has been increasingly popular in world energy consumption, and gradually becomes an important "strategic energy source". The natural gas automobile takes a gas engine as a power source, the main emission products of the natural gas automobile are carbon dioxide and water, harmful pollutants are not contained, and the natural gas automobile has the advantages of good antiknock property, complete combustion, no carbon deposition and the like, and is the most recognized clean and pollution-free energy automobile in the world at present. Therefore, as an automobile fuel, natural gas has the characteristics of low cost, high benefit, no pollution, safe use and the like, and increasingly shows strong development potential along with the continuous improvement of the technical level. Therefore, the function of the natural gas as a bridge for the transition from fossil energy to non-fossil energy is increasingly prominent, the vigorous development of natural gas automobiles is beneficial to greatly relieving the greenhouse effect and the environmental pollution of cities, the environmental problem caused by the rapid development of the cities (particularly the super-huge cities) is fundamentally improved, and the method is an important force for realizing the double-carbon target and beautiful China. The key period of adjusting the energy structure of China is positive by fourteen five, and particularly, the key period is strongly promoted along with continuous speed increase of novel urbanization process and oil and gas system reformation, so that the energy production and consumption revolution is accelerated, and the dual pressure of petroleum energy and environmental pollution can be effectively relieved by reasonably developing and utilizing natural gas, so that the development of the natural gas industry faces good historical opportunity.
To facilitate the storage and transportation of natural gas, the natural gas is usually compressed to 10 to 25MPa, and this form of natural gas is usually called Compressed Natural Gas (CNG). The compressed natural gas has the advantages of low price, safety, environmental protection, convenient storage and transportation and the like, and the technology of compressed natural gas automobiles is basically mature, and the compressed natural gas automobiles become the prime force of urban public transport. With the breakthrough of China in CNG automobile core technologies such as natural gas engine electric control units, pressure reducers, mixers, high-pressure gas storage cylinders and the like and the guidance of national energy and environmental protection policies, the hold quantity of CNG automobiles in China leaps the world first, and the hold quantity of CNG automobiles in China at the end of thirteen five reaches 632 thousands. Although China's CNG automobile develops rapidly, the corresponding related supporting facilities and equipment, especially the development of the CNG automobile gas station, which is the basic facility for supporting the CNG automobile development, are not matched with the CNG automobile gas station. By the end of 2020, a domestic CNG gas station built and operated in China has more than 9900 seats, about 1100 vehicles are served by an average single station, and the service capability of the CNG automobile gas station is seriously insufficient.
At present, CNG automobile gas stations mainly have two basic forms. One is a CNG standard station (also called a conventional station) and the other is a CNG parent station. The CNG standard station is established on an urban high-medium pressure natural gas pipe network area, raw natural gas is received through a natural gas pipeline, the raw gas is purified and dried through processes of dehydration, desulfurization and the like, the natural gas is compressed by a compressor, and then enters gas storage facilities such as a gas storage cylinder group or a gas storage well for buffering, pressure stabilization and storage, and finally a CNG automobile is aerated through a CNG aerating machine. Therefore, the construction of the CNG standard station is limited by the layout of a natural gas pipe network and the pressure of the pipe network, and a CNG compressor of a gas filling station is usually a high-power and high-energy-consumption device, and in many areas, due to the limited capacity of a city gas pipe network, the CNG standard station can face the embarrassment of 'short gas flow limiting' or even 'gas cutoff' during peak gas consumption periods, thereby bringing great influence on the operation and service of the CNG automobile standard gas filling station. The CNG parent-subsidiary station is a pipeless transmission and distribution technology developed aiming at the condition limitations of pipe networks, land acquisition, safety and the like. The main station is generally built near a receiving gate station, a pressure regulating station or a natural gas backbone network of an urban gas pipe network, and the sub-station is built in an area where a transmission and distribution pipe network is not laid yet and is far away from a main urban area or an urban area center. The CNG transfer vehicle (CNG long pipe transport trailer) takes gas from the gas filling mother station, transports the gas to each gas filling substation through a road, and then fills gas into the CNG automobile. The CNG automobile gas filling substation does not need a desulfurization and dehydration device and a high-power compressor, so the CNG automobile gas filling substation has the advantages of simple process flow, less required equipment and smaller floor area, and is particularly suitable for urban areas with nervous land and no surrounding natural gas underground pipe networks. The sub-stations radiate the periphery of the main station within a range of about 200km, dry and desulfurized compressed natural gas transported from the main station is fed into a CNG automobile through a CNG transfer trolley, a gas supply network can be formed quickly, the contradiction between the gas supply capacity of the gas station and the natural gas demand is relieved quickly, and the main way of 'natural gasification' of a non-pipe network in a built-up area of a city is realized. Particularly, a great number of CNG gas filling stations are built into a gas filling and filling combined building station in the future, and the master station and the slave station modes of the CNG automobile gas filling stations have stronger adaptability and larger development trend.
At present, CNG automobile gas filling substations are mainly of two types, namely, a mechanical compressor type CNG automobile gas filling substation and a hydraulic horizontal pushing type CNG automobile gas filling substation.
The mechanical compressor type CNG automobile gas filling substation adopts a mechanical compressor supercharging technology, so that the gas filling process is simple, but the system has more process equipment and higher energy consumption, and not only is the gas filling pressure unstable, but also the gas filling speed is slower and the gas filling rate is lower (only 85%) in the operation process.
The hydraulic horizontal-pushing CNG automobile gas filling substation is a novel technology which is rapidly developed in the field of CNG automobile gas filling substations in the last decade, and is characterized in that a natural gas compressor is replaced by a hydraulic pressurization system, the pressurization of the compressor and the gas storage of a gas storage cylinder group are not needed, and the hydraulic horizontal-pushing CNG automobile gas filling substation has the advantages of high gas filling speed, high gas taking rate (up to 95%), small occupied area, low station building investment, suitability for combined construction of gas filling stations in urban construction areas or already built gas stations and the like. However, due to the restriction of a plurality of technical bottlenecks, the main problems of the current hydraulic horizontal-pushing type CNG automobile gas filling substation are as follows: the hydraulic pressure booster device directly fills hydraulic oil into the gas storage steel cylinder of the CNG long pipe transport trailer, so that a special CNG long pipe transport trailer is required to be configured, the transport trailer in the form has the advantages of complex manufacture, heavy vehicle body, small transport volume, high transport cost and no interchangeability with a common CNGCNG long pipe transport trailer, and the investment cost for building a station is increased; the hydraulic horizontal-pushing CNG automobile gas filling substation needs to be provided with a large amount of hydraulic oil, so that the waste oil pollution problem is serious; the system design of the hydraulic gas filling substation is simple, low-end and monotonous in function, effective and necessary safety protection such as interlocking, self-locking and interlocking is lacked, the functions of recording and storing operation data are lacked, manual intervention is more, and accidents such as overpressure and oil injection of the system often occur, even hydraulic oil is injected into a CNG fuel automobile by mistake and the like.
Therefore, no matter what CNG automobile gas filling substation building form is adopted at the present stage, the investment and operation cost are high, and the development of the CNG gas filling station industry is severely restricted and hindered.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a hydraulic direct-charging type supercharging device for a CNG automobile gas filling substation, which is used for building the hydraulic direct-charging type CNG automobile gas filling substation and pressurizing a pressurized part through the device; the hydraulic oil can be output under pressure and return oil conveniently.
In order to solve the above technical problem, the utility model discloses a following technical means:
a hydraulic direct-charging type supercharging device for a CNG automobile gas filling substation comprises a hydraulic oil tank and a hydraulic pump, wherein an oil absorption filter, the hydraulic pump and an oil supply pressure adjusting module are arranged on a connecting pipeline at the oil supply end of the hydraulic oil tank; an explosion-proof oil return electromagnetic valve is arranged on a connecting pipeline at the oil return end of the hydraulic oil tank; the connecting pipeline at the oil supply end and the connecting pipeline at the oil return end are communicated with the pressurized part through an oil way reversing pneumatic valve group, and the oil way reversing pneumatic valve group controls a hydraulic oil tank to supply oil to the pressurized part or return oil from the pressurized part; an explosion-proof type differential pressure switch is arranged at the top of the hydraulic oil tank to measure the change of differential pressure in the working process of the hydraulic oil tank; the hydraulic oil tank is provided with an oil filtering device and is communicated with the oil filtering device through a connecting pipeline; the oil way reversing pneumatic valve group is provided with an OB valve, an OC valve, an OA valve and an OD valve; a connecting pipeline at the oil supply end of the hydraulic oil tank supplies oil to the pressurized component through an OB valve and an OA valve; the connecting pipeline at the oil return end of the hydraulic oil tank returns oil from the pressurized component through the OC valve and the OD valve.
According to the technical scheme, the hydraulic oil tank and the hydraulic pump are arranged to form output of hydraulic oil; the oil way reversing pneumatic valve set is arranged to control the hydraulic oil tank to supply oil to the pressurized part or return oil from the pressurized part; an explosion-proof type differential pressure switch is arranged at the top of the hydraulic oil tank to measure the change of differential pressure in the working process of the hydraulic oil tank; the hydraulic pump and the oil way reversing pneumatic valve set are controlled by utilizing the change of the pressure difference.
The further preferred technical scheme is as follows:
the hydraulic pump is driven by an explosion-proof variable-frequency asynchronous three-phase motor through coupling connection.
Through the arrangement, the explosion-proof variable-frequency asynchronous three-phase motor is used for driving the hydraulic pump to work.
The explosion-proof type differential pressure switch set up two altogether, be explosion-proof type differential pressure switch PE, explosion-proof type differential pressure switch PE respectively, explosion-proof type differential pressure switch PE set up at the hydraulic oil tank top, explosion-proof type differential pressure switch PE measure the pressure variation at hydraulic oil tank top.
Through setting up two explosion-proof type differential pressure switches, can't normally work when avoiding a damage data distortion.
The hydraulic oil tank is provided with an explosion-proof oil temperature heater.
Through setting up explosion-proof type oil temperature heater, be convenient for heat the hydraulic oil in the hydraulic tank in the lower environment of temperature, keep the good mobility of hydraulic oil.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a system diagram of a hydraulic direct-charging booster-type CNG automobile gas filling substation assembled by the utility model.
Description of reference numerals: 1-a hydraulic oil tank, 2-an oil absorption filter, 3-a hydraulic pump, 4-a coupler, 5-an explosion-proof variable frequency asynchronous three-phase motor, 6-an oil supply pressure adjusting module, 7-an oil way reversing pneumatic valve group, 01-OB valve, 702-OC valve, 703-OA valve, 704-OD valve, 8-an air way reversing pneumatic valve group, 801-GD valve, 802-GA valve, 803-GC valve, 804-GB valve, 9-a pressurizing bottle group (9), 901-a pressurizing bottle and 902-a second pressurizing bottle; 10-fast mounting street, 11-explosion-proof type oil return electromagnetic valve, 12-high pressure oil-gas separation filter, 13-safety valve, 14-main liquid level meter, 15-auxiliary liquid level meter, 16-explosion-proof type oil temperature heater and 17-oil filtering device.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1, the hydraulic direct-charging type supercharging device for the CNG automobile gas filling substation of the present invention is composed of a hydraulic oil tank 1, a hydraulic pump 3, and an oil-way reversing pneumatic valve group 7; an oil absorption filter 2, a hydraulic pump 3 and an oil supply pressure adjusting module 6 are arranged on a connecting pipeline at the oil supply end of the hydraulic oil tank 1; an explosion-proof oil return electromagnetic valve 11 is arranged on a connecting pipeline at the oil return end of the hydraulic oil tank 1; the connecting pipeline at the oil supply end and the connecting pipeline at the oil return end are communicated with the pressurized part, and the oil way reversing pneumatic valve group 7 controls the hydraulic oil tank 1 to supply oil to the pressurized part or return oil from the pressurized part; the top of the hydraulic oil tank 1 is provided with an explosion-proof differential pressure switch for measuring the change of differential pressure in the working process of the hydraulic oil tank 1; the hydraulic oil tank 1 is provided with an oil filtering device 17, and the hydraulic oil tank 1 is communicated with the oil filtering device 17 through a connecting pipeline; the oil way reversing pneumatic valve group 7 is provided with an OB valve 701, an OC valve 702, an OA valve 703 and an OD valve 704; a connecting line at the oil supply end of the hydraulic oil tank 1 supplies oil to the pressurized parts through an OB valve 701 and an OA valve 703; the connection line at the return end of the hydraulic tank 1 returns oil from the pressurized member through the OC valve 702 and the OD valve 704.
The hydraulic pump 3 is driven by the explosion-proof variable frequency asynchronous three-phase motor 5 through the coupling 4.
Through the arrangement, the explosion-proof variable-frequency asynchronous three-phase motor 5 is used for driving the hydraulic pump 3 to work.
Explosion-proof type differential pressure switch sets up two altogether, is explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 respectively, and explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 set up at hydraulic tank 1 top, and explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 measure the pressure variation at hydraulic tank 1 top.
By arranging two explosion-proof pressure difference switches, the phenomenon that one explosion-proof pressure difference switch cannot work normally when data is damaged is avoided.
The hydraulic oil tank 1 is provided with an explosion-proof oil temperature heater 16.
By arranging the explosion-proof oil temperature heater 16, the hydraulic oil in the hydraulic oil tank 1 can be conveniently heated in a low-temperature environment, and good fluidity of the hydraulic oil is kept.
According to the technical scheme, the hydraulic oil tank 1 and the hydraulic pump 3 are arranged to form output of hydraulic oil; the oil way reversing pneumatic valve group 7 is arranged to control the hydraulic oil tank 1 to supply oil to the pressurized part or return oil from the pressurized part; the top of the hydraulic oil tank 1 is provided with an explosion-proof type differential pressure switch for measuring the change of differential pressure in the working process of the hydraulic oil tank 1; and the hydraulic pump 3 and the oil way reversing pneumatic valve bank 7 are controlled by utilizing the change of the pressure difference.
Referring to fig. 2, the utility model discloses an assembled hydraulic pressure direct-charging booster-type CNG automobile gas station system, by CNG long tube transport trailer, hydraulic pressure direct-charging booster-type device, station with fixed CNG high pressure gas storage cylinder group, CNG gas dispenser and electrical control system constitute, CNG long tube transport trailer provides CNG for gas station transport; CNG in the CNG long pipe transport trailer is input into a booster cylinder group 9 by utilizing the pressure potential energy of the CNG long pipe transport trailer, and a hydraulic direct charging and boosting device boosts the CNG in the booster cylinder group 9 by utilizing a hydraulic direct charging and boosting technology and conveys the CNG to a fixed CNG high-pressure gas storage cylinder group for a station; the station fixed CNG high-pressure gas storage cylinder group is used for storing pressurized CNG and providing CNG to a CNG dispenser, and the CNG dispenser is used for metering and filling natural gas for CNG fuel automobiles; the electric control system mainly controls the automatic operation and automatic monitoring of the whole hydraulic direct filling type CNG filling substation system through a PLC control program.
The hydraulic direct-charging type supercharging device consists of a hydraulic oil tank 1, an oil absorption filter 2, a hydraulic pump 3, a coupler 4, an explosion-proof variable-frequency asynchronous three-phase motor 5, an oil supply pressure adjusting module 6, an oil way reversing pneumatic valve group 7, an air way reversing pneumatic valve group 8, an explosion-proof oil return electromagnetic valve 11, a main liquid level meter 14, an auxiliary liquid level meter 15, an explosion-proof oil temperature heater 16, an oil filtering device 17, explosion-proof pressure sensors PT1-PT5, an explosion-proof differential pressure switch PE1 and an explosion-proof differential pressure switch PE 2.
A GL valve and a high-pressure oil-gas separation filter 12 are arranged on a CNG low-pressure or medium-pressure connecting pipeline in the CNG long-tube transportation trailer, the GL valve is used for controlling transportation, and the high-pressure oil-gas separation filter 12 is used for filtering the transported CNG; CNG in the CNG long tube transport trailer is still through connecting line, pneumatic valves 8 of gas circuit switching-over and pressure boost bottle group 9 intercommunication. The CNG long pipe transport trailer is input into the booster cylinder group 9 through the gas circuit reversing pneumatic valve group 8 to be directly charged and boosted hydraulically, and the CNG of the booster cylinder group 9 after being boosted is input into the fixed CNG high-pressure gas storage cylinder group for the station through the gas circuit reversing pneumatic valve group 8.
The GAs path reversing pneumatic valve group 8 is provided with a GD valve 801, a GA valve 802, a GC valve 803 and a GB valve 804; the input end of a GD valve 801 in the gas path reversing pneumatic valve group 8 is communicated with a CNG long pipe transportation trailer through a pipeline, and the output end of the GD valve 801 is communicated with a first pressure increasing bottle 901 through a pipeline; the input end of a GC valve 803 in the gas path reversing pneumatic valve group 8 is communicated with a CNG long pipe transportation trailer through a pipeline, and the output end of the GC valve 803 is connected with a second booster bottle 902; the first pressure increasing bottle 901 is communicated with the input end of the fixed CNG high-pressure GAs storage bottle group for the station through a connecting pipeline and a GA valve 802; the second booster bottle 902 is communicated with the input end of the station fixed CNG high-pressure gas storage cylinder group through a connecting pipeline and a GB valve 804; CNG in the first pressurizing bottle 901 and the second pressurizing bottle 902 is directly pressurized by hydraulic pressure and then conveyed to a fixed CNG high-pressure gas storage bottle group for stations.
One oil supply end of the hydraulic oil tank 1 is communicated with a pressure boosting bottle group 9 through a connecting pipeline, a hydraulic pump 3, an oil supply pressure adjusting module 6 and an oil way reversing pneumatic valve group 7; the hydraulic pump 3 is driven by an explosion-proof variable frequency asynchronous three-phase motor 5 through a coupling 4; an oil absorption filter 2 is arranged on a connecting pipeline for communicating the hydraulic oil tank 1 with the pressure boosting bottle group 9; one end of the hydraulic oil tank 1 is communicated with the pressure boosting bottle group 9 through a connecting pipeline, an explosion-proof oil return electromagnetic valve 11 and an oil way reversing pneumatic valve group 7.
The fuel supply pressure adjusting module 6 adjusts the fuel supply pressure. The module mainly comprises a pilot-operated overflow valve and a two-position four-way pneumatic slide valve, wherein the pilot-operated overflow valve and the two-position four-way pneumatic slide valve are integrated on a valve block, and the pilot-operated overflow valve mainly has the functions of pressure regulation, overpressure protection and overflow.
The oil way reversing pneumatic valve group 7 is provided with an OB valve 701, an OC valve 702, an OA valve 703 and an OD valve 704; one oil supply end of the hydraulic oil tank 1 is communicated with a first pressurizing bottle 901 through a connecting pipeline and an OB valve 701; one oil supply end of the hydraulic oil tank 1 is communicated with a second booster bottle 902 through a connecting pipeline and an OA valve 703; one end of the hydraulic oil tank 1, which returns oil, is communicated with a first pressurizing bottle 901 through a connecting pipeline and an OC valve 702; one end of the hydraulic oil tank 1 is communicated with a second pressure boosting bottle 902 through a connecting pipeline and an OD valve 704.
The nominal pressure rating of the pressurized cylinder group 9 is 25MPa.
The direct-charging pressurizing device II can be designed into an integrated skid body for saving the accumulated liquid occupying the ground, a gas alarm sensor is arranged in the integrated skid body and is interconnected with a gas alarm control device in an electrical control system IV, if gas leakage occurs, the gas alarm sensor immediately sends a signal to the gas alarm control device to control a power supply of a power distribution system in a gas filling substation to cut off a power supply of equipment, and sends out an acousto-optic alarm signal to remind an operator of corresponding treatment.
The gas filling method of the hydraulic direct-filling booster-type CNG automobile gas filling substation system comprises the following steps:
(1) After the CNG long pipe transport trailer is connected with the hydraulic direct-filling type supercharging device through the fast-assembling street 10, CNG is divided into two paths, one path is directly connected with a CNG filling machine through a low-pressure (or medium-pressure) pipeline, and the CNG direct-supply function is realized; the other path of the compressed gas passes through a pneumatic reversing valve group 8 of the hydraulic direct-charging type supercharging device and then is charged into a supercharging bottle group 9, and the compressed gas is charged into a fixed CNG high-pressure gas storage bottle group for the station after being supercharged by the supercharging bottle group 9;
(2) A GD valve 801 in the GAs circuit pneumatic reversing valve group 8 is opened, CNG enters a first pressure boosting bottle 901, when a pressure detection value PT2 of a second explosion-proof pressure sensor is equal to a detection value PT1 of a first explosion-proof pressure sensor, the GD valve 801 is closed, an explosion-proof variable frequency asynchronous three-phase motor 5 of a hydraulic direct-charging pressurization device II is started, a control system transmits compressed air to a two-position four-way pneumatic sliding valve in an oil supply pressure adjusting module 6 to open the valve, a pilot-operated overflow valve is controlled to perform pressurization, an OB valve 701 in the oil circuit pneumatic reversing valve group 7 is opened to fill the first pressure boosting bottle 901 for oil pressurization, when the pressure detection value PT2 of the second explosion-proof pressure sensor is equal to a fourth explosion-proof pressure sensor PT4, a GA valve 802 is opened, and the pressurized CNG is stored in a station fixed CNG high-pressure GAs storage bottle group;
(3) The system sets the lower liquid level limits of a main liquid level meter 14 and an auxiliary liquid level meter 15 of the hydraulic oil tank 1 according to the volume of a single booster bottle of the booster bottle group 9 in advance, and the lower liquid level limits are set to be 95% of the volume of the single booster bottle in the embodiment; when the main liquid level meter 14 or the auxiliary liquid level meter 15 detects a lower limit signal of the liquid level, the CNG of the pressurization bottle 901 a is pushed out to the fixed CNG high-pressure GAs storage bottle group for the station, at this time, the OB valve 701 and the GA valve 802 are closed, and an oil return program of the pressurization bottle 901 a is opened; when the system is filled with oil, the liquid level meter detects a lower limit signal, and then the CNG output in the pressurization steel cylinder is determined to be finished;
(4) During oil return, the explosion-proof oil return electromagnetic valve 11 is opened, the OC valve 702 in the oil way pneumatic reversing valve group 7 is opened, hydraulic oil in the first pressurizing bottle 901 can return to the hydraulic oil tank 1 under the action of residual pressure until the oil return of the first pressurizing bottle 901 is finished after the explosion-proof pressure difference switch PE1 or PE2 on the hydraulic oil tank 1 detects an air pressure signal, and then the explosion-proof oil return electromagnetic valve 11 and the OC valve 702 are closed; in the oil return process, the pressure in the hydraulic oil tank 1 is relatively stable due to the hydraulic oil which starts to enter the hydraulic oil tank 1. When oil return is finished, gas in the pressurizing bottle enters the hydraulic oil tank 1 to enable the internal pressure of the hydraulic oil tank to be increased rapidly, and the explosion-proof type pressure difference switch PE1 or PE2 provides a signal to enable the explosion-proof type oil return electromagnetic valve 11 to be closed after detecting the signal that the pressure is increased rapidly;
(5) In the process of directly charging and pressurizing the first booster cylinder 901 by hydraulic pressure, a GC valve 803 in the gas path pneumatic reversing valve group 8 is opened, CNG in the CNG long pipe transportation trailer enters a second booster cylinder 902 of the booster cylinder group 9, and when the detection value PT3 of the third explosion-proof pressure sensor is equal to the detection value PT1 of the first explosion-proof pressure sensor, the GC valve 803 is closed; when the first booster bottle 901 returns oil, the oil injection system is restarted, the OA valve 703 in the oil-way pneumatic reversing valve group 7 is opened, hydraulic oil in the hydraulic oil tank 1 enters the second booster bottle 902, the hydraulic booster system starts to boost CNG in the second booster bottle 902, when the detection value PT3 of the third explosion-proof pressure sensor is equal to the detection value PT4 of the fourth explosion-proof pressure sensor, the GB valve 804 in the gas-way pneumatic reversing valve group 8 is opened, and the boosted CNG enters the fixed CNG high-pressure gas storage bottle group;
(6) When the main liquid level meter 14 or the auxiliary liquid level meter 15 detects a liquid level lower limit signal, the CNG of the second booster bottle 902 is pushed out to the station high-pressure gas storage bottle group III, at this time, the OA valve 703 and the GB valve 804 are closed, and an oil return program of the second booster bottle 902 is started;
(7) When the second booster bottle 902 returns oil, the explosion-proof oil return electromagnetic valve 11 is opened, the OD valve 704 is opened, the hydraulic oil in the second booster bottle 902 returns to the hydraulic oil tank 1 under the action of residual pressure until the pressure difference switch PE1 or PE2 on the hydraulic oil tank 1 detects an air pressure signal, the oil return process of the second booster bottle 902 is completed, and the explosion-proof oil return electromagnetic valve 11 and the OD valve 704 are closed;
(8) And repeating the steps from 1 to 6 until the pressure of the CNG in the CNG long pipe transport trailer is reduced to about 1 to 2MPa, ending the unloading of the CNG, and replacing the next CNG long pipe transport trailer to continuously provide a CNG gas source for the CNG filling station.
In the oil injection and oil return processes, after the oil injection of the first pressure boosting bottle 901 is finished, the oil return program of the first pressure boosting bottle 901 is started at an interval of time T1; after a time T2, the oil injection program of the second booster bottle 902 is started again, namely the system is in a state of oil injection while oil return; generally, the oil return speed of the system is higher than the oil injection speed of the system, but due to uncertainty of the system, if the opening degree of some valves in an oil return pipeline is insufficient in the using process, the oil return pipeline is blocked, the oil return speed is lower than the oil injection speed, CNG in a booster bottle is not completely discharged in the oil return and oil injection process of the system, the liquid level in an oil tank reaches the lower limit, the system determines that the oil injection of a second booster bottle 902 is finished, and then the oil return program of the second booster bottle 902 is started, namely the system fault; in order to prevent the fault, the system is in the stage of oil filling while oil returning, the program design is restricted by an oil filling time threshold value T, and the electric control system sets two restriction conditions, wherein the lower limit of the liquid level meter is 95% of the volume of a single booster cylinder, and the oil filling time threshold value is determined according to the displacement of the hydraulic pump and the volume of the booster cylinder, T = V/nq, wherein V represents the volume (L) of the single booster cylinder, n represents the rotating speed (RPM) of the hydraulic pump, and q represents the displacement (L/Rev) of the hydraulic pump per revolution. If the oil injection time is less than T, even if the liquid level meter generates a lower limit signal, the system does not consider that the oil injection is finished, but sends a fault alarm signal to prompt that the oil injection time is too short and the oil return system has a fault.
The above description is only a preferred and practical embodiment of the present invention, and not intended to limit the scope of the present invention, and all structural equivalents made by using the contents of the specification and drawings are included in the scope of the present invention.
Claims (4)
1. The utility model provides a hydraulic pressure direct-charging formula supercharging device for CNG car gas filling substation, includes hydraulic tank (1), hydraulic pump (3), its characterized in that: an oil suction filter (2), a hydraulic pump (3) and an oil supply pressure adjusting module (6) are arranged on a connecting pipeline at the oil supply end of the hydraulic oil tank (1); an explosion-proof oil return electromagnetic valve (11) is arranged on a connecting pipeline at the oil return end of the hydraulic oil tank (1); the connecting pipeline at the oil supply end and the connecting pipeline at the oil return end are communicated with the pressurized part through an oil way reversing pneumatic valve group (7), and the oil way reversing pneumatic valve group (7) controls the hydraulic oil tank (1) to supply oil to the pressurized part or return oil from the pressurized part; the top of the hydraulic oil tank (1) is provided with an explosion-proof differential pressure switch for measuring the change of differential pressure in the working process of the hydraulic oil tank (1); the hydraulic oil tank (1) is provided with an oil filtering device (17), and the hydraulic oil tank (1) is communicated with the oil filtering device (17) through a connecting pipeline;
the oil way reversing pneumatic valve group (7) is provided with an OB valve (701), an OC valve (702), an OA valve (703) and an OD valve (704); a connecting pipeline at one end of the hydraulic oil tank (1) for supplying oil is used for supplying oil to the pressurized parts through an OB valve (701) and an OA valve (703); a connecting line at the oil return end of the hydraulic oil tank (1) returns oil from the pressurized member through the OC valve (702) and the OD valve (704).
2. The hydraulic direct-charging type pressurization device for the CNG automobile gas filling substation according to claim 1, wherein: the hydraulic pump (3) is driven by the explosion-proof variable frequency asynchronous three-phase motor (5) through the connection of a coupler (4).
3. The hydraulic direct-charging type supercharging device for the CNG automobile gas filling substation according to claim 1, characterized in that: the explosion-proof type differential pressure switch set up two altogether, be explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 respectively, explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 set up at hydraulic tank (1) top, explosion-proof type differential pressure switch PE1, explosion-proof type differential pressure switch PE2 measure the pressure variation at hydraulic tank (1) top.
4. The hydraulic direct-charging type supercharging device for the CNG automobile gas filling substation according to claim 1, characterized in that: the hydraulic oil tank (1) is provided with an explosion-proof oil temperature heater (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221790967.0U CN217784844U (en) | 2022-07-13 | 2022-07-13 | Hydraulic direct-charging type supercharging device for CNG (compressed natural gas) automobile gas filling substation |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN202221790967.0U CN217784844U (en) | 2022-07-13 | 2022-07-13 | Hydraulic direct-charging type supercharging device for CNG (compressed natural gas) automobile gas filling substation |
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