CN104747904A - Hydraulic type compressed natural gas secondary filling station and control method thereof - Google Patents
Hydraulic type compressed natural gas secondary filling station and control method thereof Download PDFInfo
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- CN104747904A CN104747904A CN201310731826.0A CN201310731826A CN104747904A CN 104747904 A CN104747904 A CN 104747904A CN 201310731826 A CN201310731826 A CN 201310731826A CN 104747904 A CN104747904 A CN 104747904A
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Abstract
The invention discloses a hydraulic type compressed natural gas secondary filling station and a control method of the hydraulic type compressed natural gas secondary filling station. The method for carrying out air filling on equipment with air to be filled comprises the steps that hydraulic oil is extracted from an oil storage device through an oil path, hydraulic oil is injected into a steel cylinder stored with compressed natural gas, and the hydraulic oil pushes the stored compressed natural gas out of the steel cylinder; the compressed natural gas passes through an exhaust pipe to reach an air filling device, and the air filling device is utilized for enabling the air filling equipment to carry out air filling; the compressed natural gas stored in the steel cylinder is not exhausted to the preset exhaust value, when air filling of the equipment with air to be filled is finished, an oil path is stopped from injecting hydraulic oil to the steel cylinder and is revered into an oil returning pipeline, and pressure force of the compressed natural gas is utilized for enabling hydraulic oil in the steel cylinder to flow back to an oil storage device; when the hydraulic oil in the steel cylinder flows back to an oil returning stop position, the oil path finishes the oil returning motion; when air filling in the next time is carried out, hydraulic oil is injected into the steel cylinder continuously, next equipment with air to be filled is filled with air until air filling of the equipment with air to be filled is finished; and hydraulic oil can conveniently flow back to an oil storage device in time.
Description
Technical field
The present invention relates to compressed natural gas filling system, particularly relate to one and can ensure hydraulic natural gas air entraining substation hydraulic compressed natural gas air entraining substation and controlling method thereof.
Background technique
Rock gas is used as fuel for motor vehicle more and more as a kind of clean energy resource, and such as, compressed natural gas (CNG) is exactly a kind of common gas fuel.In order to give automobile with compressed natural gas fueling, need special fuel delivery system, i.e. compressed natural gas filling system.This system can be built near gas distributing system, also can build in the place without pipe network.Building at the compressed natural gas filling substation system without pipe network area, mostly comprising for transporting, the gas source unit of store compressed rock gas, the aerating unit for providing aerating to operate.Usually, gas source unit can comprise the trailer of carrying steel cylinder components, so that it moves.
Each gas source unit can have multiple steel cylinder components, and each steel cylinder components can comprise: one for storing the steel cylinder of compressed natural gas, an outlet pipe be connected with this steel cylinder and one for controlling the final controlling element of outlet pipe opening and closing.Aerating unit comprises oil circuit device, Fuel Tanking Unit, gas path device and the control gear for controlling whole refueling system.Two oil circuit joints be connected with Fuel Tanking Unit are also provided with in the oil circuit device of aerating unit.
When needs aerating, the gas exhausting operator of corresponding steel cylinder components opened by control gear, makes the compressed natural gas stored in steel cylinder, and the gas path joint via outlet pipe and gas path device arrives filling machine, and recycling filling machine is for treating that aerating equipment carries out aerating operation.When being vented, usually to the steel cylinder injection liquid force feed of correspondence, can discharge to contribute to compressed natural gas in steel cylinder; Deng the compressed natural gas in steel cylinder close to after emptying, make the oil be injected into wherein be back to Fuel Tanking Unit, thus oil can repetitive cycling be used.At ordinary times, oil is stored in the Fuel Tanking Unit of aerating unit oil circuit device, and is supplied to gas source unit by two oil circuit joints and is returned Fuel Tanking Unit.
Application number is 200810115135.7, name is called the background technique part of the Chinese invention patent of " gas source unit, the refueling system with it and gas charging control method ", disclose a kind of traditional air entraining substation system that can realize above-mentioned functions, wherein, gas source unit generally includes eight steel cylinder components (only show 4 in figure, other omits).With reference to shown in Fig. 1, its gas source unit comprises eight steel cylinder components, and each steel cylinder components comprises steel cylinder, an outlet pipe 11, oil pipe (namely noting return tube) 12 and two final controlling element, i.e. gas exhausting operator 13 and note oil return final controlling element 14.Eight steel cylinder components are divided into two groups in equal size, and namely often the quantity of steel cylinder components is identical in group.The note return tube 12 of first group of steel cylinder components 1-1,1-2,1-3,1-4 is pooled to the first main oil pipe 15, and the note return tube 12 of second group of steel cylinder components 2-1,2-2,2-3,2-4 is pooled to the second main oil pipe 16.Similar with traditional refueling system, the outlet pipe of all steel cylinder components is pooled to total air escape pipe 17.First and second main oil pipes 15,16 and total air escape pipe 17 are detachably connected to the first oil circuit joint of aerating unit, the second oil circuit joint and gas path joint 18 respectively.
When needs aerating, from first group, alternately oiling bleeding is carried out to the steel cylinder components of in first group and second group, make the hydraulic oil in Fuel Tanking Unit enter into steel cylinder via the note return tube of corresponding in the first and second main oil pipes and corresponding steel cylinder components, and the compressed natural gas in this steel cylinder is discharged via the outlet pipe of correspondence and total air escape pipe.After the oiling bleeding of each steel cylinder components is completed, oil return operation is carried out to same steel cylinder components, the hydraulic oil in corresponding steel cylinder is got back in described Fuel Tanking Unit via one corresponding in note return tube and first group and second group of main oil pipe.
In existing air entraining substation pattern, gas source unit and aerating unit use possibly under different ambient temperatures.Such as, when air entraining substation uses when ambient temperature is very low, be injected into the steel cylinder in gas source unit when hydraulic oil after.If downstream there is no vehicle aerating and in bottle, gas pressure does not fall time, aerating unit is by autostop.Because this steel cylinder does not complete the oil filling amount that whole volume normally sets, now hydraulic oil by by long-time storage in the steel cylinder of gas source unit, the too low meeting of ambient temperature makes the hydraulic oil viscosity in bottle increase, and explosion-proof for considering in gas source unit, can not arrange heating measures.If therefore this steel cylinder is after the long period is waited for, when completing the working state of this steel cylinder and start oil return, hydraulic oil, by low temperature effect, can make hydraulic oil viscosity increase.
Two kinds of problems can be brought like this:
Hydraulic oil back-flow velocity reduces, and can not be back to as early as possible in the Fuel Tanking Unit of aerating unit, if Fuel Tanking Unit oil level is to minimum, then aerating operation can only suspend, and can affect the continuous operation of equipment.
And in prior art, consider the pressure stability of the compressed natural gas of Economy and output, in the control program of existing hydraulic pressure air entraining substation, when only having steel cylinder to be vented to the default discharge value of class as 95%, just understand oil return and continue to another new steel cylinder servicing fluids force feed, in system, hydraulic oil will continue to maintain pressurized state, other time hydraulic oil in system can't be considered to carry out oil return operation, even if when changing gas source unit, can pressurized state be maintained equally, can be see application number: the Chinese invention patent of 200520133308.X and 200810115135.7.So in order to solve Low Temperature Problems, only can expect in prior art being incubated or temperature correction process steel cylinder.
Summary of the invention
For solving technical problem of the prior art, the object of the invention is to, a kind of hydraulic compressed natural gas air entraining substation controlling method that hydraulic natural gas air entraining substation can run in cold environments that can ensure is provided.
In order to address this problem, the invention provides a kind of hydraulic natural gas air entraining substation controlling method: treat that the step that aerating equipment carries out aerating comprises to one:
Extract hydraulic oil by oil circuit from a Fuel Tanking Unit, the steel cylinder to a store compressed rock gas injects described hydraulic oil, releases the compressed natural gas stored in described steel cylinder with described hydraulic oil;
The compressed natural gas stored in described steel cylinder arrives an aerator via outlet pipe, utilize described aerator for described in treat that aerating equipment carries out aerating;
The compressed natural gas stored in described steel cylinder does not drain into one and presets discharge value, when described treat the aerating of aerating equipment at the end of, described oil circuit stops in described steel cylinder, note described hydraulic oil and commutation is return line, utilizes compressed natural gas pressure to be back in described Fuel Tanking Unit by hydraulic oil in described steel cylinder;
When in described steel cylinder, described hydraulic oil is back to an oil return cut-off position, described oil circuit stops this oil return action; When carrying out next aerating, continue to described steel cylinder injection liquid force feed, for next treats that aerating equipment carries out aerating, until this treats that the aerating of aerating equipment terminates.
The controlling method that the present invention provides, overcomes that related domain designer thinks: aerating unit must continue to maintain the technology prejudice of pressurized state.The present invention can environmentally temperature variation, controls to be back in Fuel Tanking Unit after timely for hydraulic oil release, can overcome low temperature and bring technical problem and potential safety hazard.Though need when again continuing to recover pressurization, actual cost is far below cost steel cylinder being carried out to moisturizing or temperature correction, and safer.Further, utilize controlling method of the present invention not need to adjust system hardware on a large scale, transformation and upgrade cost is lower.
According to above-mentioned design of the present invention, aforementioned in the described aerating operation treating aerating equipment, when the compressed natural gas in described steel cylinder drains into described default discharge value, described oil circuit stops in described steel cylinder, note described hydraulic oil and commutation is return line, and described hydraulic oil starts to be back to described Fuel Tanking Unit; While described hydraulic oil starts backflow, the steel cylinder then to a new store compressed rock gas injects described hydraulic oil, proceeds aerating operation; Until described in treat that the aerating of aerating equipment terminates.
According to above-mentioned design of the present invention, when described treat the aerating of aerating equipment at the end of, as as described in the compressed natural gas that stores in steel cylinder do not drain into as described in preset discharge value, with a control gear environmentally temperature determine whether to carry out compressed oil backflow action, and determine the delay time carrying out compressed oil backflow action, and according to described delay time time delay, hydraulic oil in described steel cylinder is back in Fuel Tanking Unit.
This automatic control mode, environmentally temperature variation accurately controls oil return opportunity, to neglect, and forget oil return because of staff.Adopt this controlling method can avoid hydraulic oil at low ambient temperatures, in long-time delay steel cylinder, thus it is too low effectively to solve hydraulic fluid temperature, can not oil return in time or the halfway problem of oil return after viscosity increases, coordinate Fuel Tanking Unit oil return liquid level cut off point, also effectively can prevent the rock gas of high pressure from entering in Fuel Tanking Unit and cause fuel injection event.
According to above-mentioned design of the present invention, if this is after the aerating of aerating equipment terminates, when described treat the aerating of aerating equipment at the end of, the compressed natural gas stored in described steel cylinder does not drain into described default discharge value, is back in Fuel Tanking Unit by hydraulic oil in described steel cylinder with Non-follow control.
This manual control mode, can grasp the oil return opportunity of hydraulic oil flexibly, can the quick hydraulic control oil oil return when these air entraining substation business hours terminate or suspend business, and also rule of thumb, can select not oil return in busy, then to reset in time oil return in idle.Adopt this controlling method can avoid hydraulic oil at low ambient temperatures, in long-time delay steel cylinder, thus it is too low effectively to solve hydraulic fluid temperature, can not oil return in time or the halfway problem of oil return after viscosity increases, coordinate Fuel Tanking Unit oil return liquid level cut off point, also effectively can prevent the rock gas of high pressure from entering in Fuel Tanking Unit and cause fuel injection event.
According to above-mentioned design of the present invention, have level meter in described Fuel Tanking Unit, have level meter in described Fuel Tanking Unit, described level meter has the highest Liquid level point, minimum liquid level control point and oil return Liquid level point, wherein, below the highest Liquid level point, oil return liquid level cut off point is increased; When compressed natural gas does not drain into default discharge value in described steel cylinder, when hydraulic oil oil return is to described oil return liquid level cut off point in described steel cylinder, stop the oil return action of described hydraulic oil.
The present invention also provides a kind of hydraulic compressed natural gas air entraining substation, comprises aerating unit and at least one gas source unit; Each gas source unit has at least one steel cylinder components; Each steel cylinder components comprises: the steel cylinder of at least one store compressed rock gas, outlet pipe be connected with described steel cylinder, one for controlling the final controlling element of described outlet pipe opening and closing, note return tube be connected with described steel cylinder, one for controlling the final controlling element of described note return tube opening and closing, and the gas path joint be connected with an aerating unit;
Described aerating unit comprises oil circuit device, stores the Fuel Tanking Unit of hydraulic oil, gas path device and the control gear for controlling whole refueling system; Described oil circuit device comprises the selector valve group flowed to the oil hydraulic pump of described steel cylinder supply hydraulic oil, switching controls hydraulic oil, the oil filling pipeline and being connected described steel cylinder note return tube by described selector valve group is switched to the return line of described Fuel Tanking Unit by described selector valve group, it is characterized in that, in described Fuel Tanking Unit, there is level meter, described level meter has the highest Liquid level point, minimum liquid level control point and oil return Liquid level point, wherein, below the highest Liquid level point, oil return liquid level cut off point is increased;
The compressed natural gas stored in described steel cylinder does not drain into one and presets discharge value, at the end for the treatment of the aerating of aerating equipment to one, oil circuit device described in described control gear delays time to control stops in described steel cylinder, note described hydraulic oil and commutation is return line, utilizes compressed natural gas pressure to be back in described Fuel Tanking Unit by hydraulic oil in described steel cylinder; When the described hydraulic oil refluxed makes described Fuel Tanking Unit liquid level to described oil return liquid level cut off point, described control gear controls the oil return action that described oil circuit device stops described hydraulic oil.
According to above-mentioned design of the present invention, described Fuel Tanking Unit is provided with heating equipment, and is provided with temperature transducer in Fuel Tanking Unit; According to the data of temperature sensor senses, described control gear controls described heating equipment and heats described hydraulic oil.Described heating equipment can be anti-explosion electric heating stick.
Hydraulic compressed natural gas air entraining substation that the present invention proposes, overcomes that related domain designer thinks: aerating unit must continue to maintain the technology prejudice of pressurized state.The present invention is temperature variation environmentally, controls to be back in Fuel Tanking Unit after timely for hydraulic oil release, can overcome low temperature and bring technical problem and potential safety hazard.Though need when again continuing to recover pressurization, actual cost far below cost steel cylinder being carried out to moisturizing or temperature correction, and greatly reduces the security of system hidden danger that low temperature brings.Further, utilize controlling method of the present invention not need to adjust system hardware on a large scale, transformation and upgrade cost is lower.
Accompanying drawing explanation
Fig. 1 is a kind of sketch adopting the compressed natural gas filling substation system of controlling method of the present invention.
Description of reference numerals:
Outlet pipe 11, oil pipe 12, gas exhausting operator 13, note oil return final controlling element 14, first main oil pipe 15, first group of steel cylinder components 1-1, 1-2, 1-3, second group of steel cylinder components 2-1, 2-2, 2-3, second main oil pipe 16, total air escape pipe 17, gas path joint 18, filling machine pipeline 19, first oil circuit joint 20, second oil circuit joint 21, oil hydraulic pump 22, selector valve group 23, oil filling pipeline 24, level meter 26, oil return Liquid level point 27, minimum liquid level control point 28, the highest Liquid level point 29, oil return liquid level cut off point 29a, Fuel Tanking Unit 3, gas buffer bottle 4.
Embodiment
The exemplary embodiments embodying feature & benefits of the present invention will describe in detail in the following description.Be understood that the present invention can have various changes in different embodiments, it neither departs from the scope of the present invention, and explanation wherein and to be shown in be use when explain in essence, and be not used to limit the present invention.
As shown in Figure 1, compressed natural gas filling system of the present invention comprises gas source unit and aerating unit.Similarly to the prior art, each steel cylinder components in gas source unit comprises one for storing the steel cylinder 1-1 to 2-3 of compressed natural gas, an outlet pipe be connected with steel cylinder 11 and one for controlling the gas exhausting operator 13 of outlet pipe opening and closing.Each in first group of steel cylinder components of gas source unit and second group of steel cylinder components also comprises: an oil pipe be connected with steel cylinder (namely noting return tube) 12 and one are for controlling the final controlling element 14 of this note return tube opening and closing.Wherein, the outlet pipe 11 of each steel cylinder components is pooled to the first main oil pipe 15 of total air escape pipe 17, first group of steel cylinder components of gas source unit and the second main oil pipe 16 dismountable first oil circuit joint 20, second oil circuit joint 21 being connected to aerating unit respectively of second group of steel cylinder components.
Being provided with oil circuit device in aerating unit, storing the Fuel Tanking Unit 3 of hydraulic oil, gas path device and the control gear for controlling whole refueling system, aerating unit can be positioned at a prying body, can be incubated prying body or temperature correction process.Oil circuit device contains oil hydraulic pump 22, selector valve group 23, oil filling pipeline 24, return line 25; Gas path device contains the gas path joint 18 be connected with gas source unit, the pipeline 19 of gas buffer bottle 4, connection filling machine; One control gear is for controlling the automatic operation of whole compressed natural gas filling system, and control gear can be a PLC, each valve member in connection control system.There is in aerating unit the first oil circuit joint 20, second oil circuit joint 21 and gas path joint 18.Wherein, the first and second oil circuit joints 20,21 are connected with Fuel Tanking Unit 3 respectively, and gas path joint 18 is connected with surge flask 4, filling machine pipeline 19.
Also can increase anti-explosion electric heating stick in Fuel Tanking Unit 3, under low-temperature condition, after oil return operation, again during starting device, the hydraulic oil in Fuel Tanking Unit 3 is heated, and control gear can establish temperature transducer in oil circuit, to detect the temperature of hydraulic oil, and control startup and the stopping of heating stick accordingly.
Gas source unit first group and second group of main oil pipe 15,16 are detachably connected to the first and second oil circuit joints 20,21 respectively by high-pressure oil pipe; Total air escape pipe 17 is detachably connected to gas path joint 18 by high-pressure air pipe.Control gear is connected respectively with oil circuit device, gas path device, to control the working state of corresponding intrument.Each final controlling element of gas source unit is also connected respectively to control gear, thus controls by control gear is unified.
The pipeline that gas source unit is connected with aerating unit has first group and second group of main oil pipe 15,16 to be detachably connected to the first and second oil circuit joints 20,21 respectively by high-pressure oil pipe; Total air escape pipe 17 is detachably connected to gas path joint 18 by high-pressure air pipe.
Automobile with compressed natural gas refueling system workflow is: the pipeline connecting gas source unit and aerating unit, control system is from first group of gas source unit, alternately oil injection operation is carried out to the steel cylinder components of in first group and second group, make the hydraulic oil in Fuel Tanking Unit 3 via one of correspondence in the first and second main oil pipes, and first of corresponding steel cylinder components group and second group of main oil pipe 15, 16 enter into steel cylinder, and the compressed natural gas in this steel cylinder is discharged via outlet pipe 11 total air escape pipe 17 of correspondence, now with the compressed natural gas of gas source unit along total air escape pipe road 17, gas path joint 18, arrive surge flask 4, and arrive filling machine through connecting filling machine pipeline 19, to vehicle aerating.
When steel cylinder components carries out oiling, if be injected into the amount of the hydraulic oil of steel cylinder components, liquid level in Fuel Tanking Unit is made to arrive oil return Liquid level point 27, then selector valve group 23 can commutate, first group of main oil pipe 15 of such as gas source unit is in oiling state, steel cylinder components is in oiling state, if the hydraulic oil of steel cylinder components 1-1 reaches the volume 95% of steel cylinder components, then system can think that oiling completes, selector valve group 23 commutates, after commutation, first group of main oil pipe 15 is in oil return state, namely the hydraulic oil of steel cylinder components 1-1 makes hydraulic oil turn back in the Fuel Tanking Unit 3 of oil circuit device under the pressure of the compressed natural gas of steel cylinder volume 5%, and second group of main oil pipe 16 can be in oiling state, namely hydraulic oil can arrive in second group of main oil pipe 16 of gas source unit along selector valve group 23, now steel cylinder components 2-1 can be in oiling state.So alternately oil injection operation is carried out to the steel cylinder components of in first group and second group.
When equipment normally runs, control oil return operation when whole refueling system runs by the level meter 26 of Fuel Tanking Unit 3.The level meter 26 of usual Fuel Tanking Unit 3 can be provided with the oil return Liquid level point 27 a little more than minimum liquid level control point 28, in i.e. oiling process when the liquid level of Fuel Tanking Unit 3 reaches oil return Liquid level point 27, the control point of oil return Liquid level point 27 can feed back signal to control gear.According to the signal that oil return Liquid level point 27 feeds back, control gear confirms that oiling terminates.Control gear controls the final controlling element (pneumatic control valve) 13 of selector valve group 23 and gas source unit, makes current steel cylinder components terminate oil injection operation.Wherein level meter 26 is provided with minimum liquid level control point 28, can be reported to the police by minimum liquid level control point 28 control system when oil return Liquid level point 27 breaks down.May not exceed the highest Liquid level point 29 when Fuel Tanking Unit 3 fills hydraulic oil, level meter 26 arranges minimum liquid level control point and makes to be injected into hydraulic oil in gas source unit steel cylinder components in a suitable scope.Usually the hydraulic oil be injected in steel cylinder is about the default discharge value (such as user can be set as that hydraulic oil has accounted for 95% of steel cylinder volume) of steel cylinder volume, and the compressed natural gas of remaining 5% makes the hydraulic oil be injected in steel cylinder turn back in Fuel Tanking Unit 3.
If when gas source unit and aerating unit use when ambient temperature is very low.Section hydraulic oil is pressed into by high pressure after in first group of steel cylinder components 1-1 of gas source unit by such as aerating unit, downstream does not have aerating vehicle, and this steel cylinder internal pressure keeps original pressure not reduce, now aerating unit control system can be automatically out of service by whole system, treats that pressure drop could realize oiling state by the automatic starting device of PLC in limited time to the lower of setting pressure.When ambient temperature is very low, because gas source unit considers Explosion-Proof, can not be provided with corresponding electric heating measure, hydraulic oil is deposited for a long time and its viscosity can be made to increase in steel cylinder.When this steel cylinder complete oiling state start oil return time, full-bodied hydraulic oil can through being just back in the hydraulic oil container of aerating unit for a long time, and the equipment that affects normally runs.
Due under normal circumstances, it is lean on the oil return Liquid level point 27 that the level meter 26 of Fuel Tanking Unit 3 in aerating unit is arranged to control that system starts oil return, only have when liquid level reaches this Liquid level point, system just can stop oiling in steel cylinder, and hydraulic oil could be got back in the Fuel Tanking Unit 3 of aerating unit from gas source unit.If so (when the liquid level namely in Fuel Tanking Unit 3 does not reach the oil return Liquid level point 27 that level meter 26 is arranged) system can not start oil return when the hydraulic oil in gas source unit does not complete be filled into steel cylinder volume 95%, hydraulic oil can be deposited in the steel cylinder of gas source unit in this process for a long time.Under cold ambient temperature effect, hydraulic pressure oil viscosity can great changes will take place, causes system can not normally oil return.
In view of the foregoing, in order to avoid the generation of this phenomenon, the present invention will increase manually and/or automatic control mode in a control program, so that when needed, in time hydraulic oil in the steel cylinder not draining into default discharge value is carried out oil return reset operation, hydraulic oil major part is got back in Fuel Tanking Unit 3.This reset operation timely can avoid external environment on the impact of hydraulic oil in steel cylinder, when air entraining substation also can be made to close, without the high pressure conditions of maintenance medium force feed, cold snap obviously also can be avoided better on the impact of hydraulic oil in steel cylinder.And, the present invention also will arrange the finishing control point of this oil return homing action, when in steel cylinder, hydraulic oil is back to an oil return cut-off position, this oil return action of timely termination, to prevent the compressed natural gas of high pressure from pouring Fuel Tanking Unit 3, specifically oil return liquid level cut off point 29a can be increased below the highest Liquid level point 29 of the level meter 26 of Fuel Tanking Unit 3.When this oil return reset operation, this oil return liquid level cut off point 29a plays cut-off effect, in case during non-return oil reset operation, the compressed natural gas of high pressure pours in Fuel Tanking Unit 3.
Certainly, alternate manner also can be utilized to reach oil return cut-off position this purpose, such as: establish rock gas inductor in oil circuit, after sensing that in oil circuit concentration of natural gas exceeds setting value, end oil return action by control gear in time.The control gear control oil return time can also be utilized to avoid compressed natural gas to pour in Fuel Tanking Unit 3, be not limited to the mode of execution of above-mentioned oil return liquid level cut off point 29a, certainly, arranging oil return liquid level cut off point 29a is current most preferred mode, it with minimum change, can obtain the most accurate control effects.
In the present invention, the highest Liquid level point 29 of oil return liquid level cut off point 29a distance has a suitable distance, this distance can according to the tubing length of selector valve group 23 to Fuel Tanking Unit 3, converse the amount of hydraulic oil in this section of oil pipe, and add the amount that upper controller controls before selector valve group 23 is ended completely reflux liquid force feed, being scaled Fuel Tanking Unit 3 liquid level distance can draw.In a word, before making the compressed natural gas of high pressure arrive the valve member implementing cut-off, oil return homing action is ended in advance.
The present invention now provides the following two kinds controlling method:
The first controlling method: arrange manual oil return operating switch on equipment control cabinet, can be located in aerating unit, and its signal connects the control gear of aerating unit.At low ambient temperatures, if operator think follow-up long-time in can not carry out aerating operation, manual mode can be adopted to interfere the method for operation of control gear, make control gear control system carry out oil return operation.With manual circuit, carry out the successfully oil return of hydraulic control oil in Fuel Tanking Unit 3, and, when liquid level on the level meter 26 of the Fuel Tanking Unit 3 of aerating unit reaches oil return liquid level cut off point 29a, control gear can stop oil return automatically, prevents the rock gas of high pressure to be back in Fuel Tanking Unit 3 and causes fuel injection event.This kind of controlling method is only being in oil injection operation and the steel cylinder that do not complete of oil injection operation to current, and the oil return carried out especially operates.When there being aerating vehicle (such as second day), through the hydraulic oil in Fuel Tanking Unit 3 is heated, hydraulic oil after heating is injected into the steel cylinder (namely carrying out the current steel cylinder of oil return operation in winter) be not vented completely through oil hydraulic pump, system can recover normal cycling successively afterwards, can not cause hydraulic oil remaining in steel cylinder.The present invention addresses prior art Problems existing from two aspects.
When carrying out next aerating, continue to not drained steel cylinder injection liquid force feed, after in steel cylinder, compressed natural gas returns to former pressure, just for next treats that aerating equipment carries out aerating, until this treats that the aerating of aerating equipment terminates.
If in aerating operation, after the compressed natural gas in steel cylinder drains into default discharge value (95%), the same hydraulic control oil automatically of control gear starts to be back to Fuel Tanking Unit 3; And hydraulic oil start backflow while, the steel cylinder controlled to a new store compressed rock gas injects this hydraulic oil, proceed aerating operation; Until treat that the aerating of aerating equipment terminates.
This manual control mode, can grasp the oil return opportunity of hydraulic oil flexibly, can the quick hydraulic control oil oil return when these air entraining substation business hours terminate or suspend business, and also rule of thumb, can select not oil return in busy, in idle then oil return in time.Adopt this controlling method can avoid hydraulic oil at low ambient temperatures, in long-time delay steel cylinder, thus it is too low effectively to solve hydraulic fluid temperature, can not oil return in time or the halfway problem of oil return after viscosity increases, coordinate Fuel Tanking Unit 3 oil return liquid level cut off point 29a, also effectively can prevent high-pressure natural gas from entering in Fuel Tanking Unit 3 and cause fuel injection event.
The second controlling method; Increase low-temperature condition in the control program of control gear under, automatic oil return operation control mode, and temperature transducer and pressure transducer is increased in gas source unit, aerating unit or oil circuit.
After Whole Equipment powers on, if when device detection system pressure maintenance high pressure does not reduce, oil hydraulic pump 22 is in holding state out of service, and control gear can according to the temperature transducer of peripheral hardware, automatic testing environment temperature.
If ambient temperature is lower than (temperature can set according to hydraulic oil material behavior) when 0 degree Celsius, if equipment holding state out of service exceedes a certain delay time (as 60 minutes, delay time user can set according to actual conditions, certainly also multiple time can be set in control gear program, environmentally temperature range carries out corresponding selection), now system will automatically perform low temperature oil return operation control mode until the hydraulic oil oil return of current steel cylinder terminates.When carrying out next aerating, continue to not drained steel cylinder injection liquid force feed, after in steel cylinder, compressed natural gas returns to former pressure, just for next treats that aerating equipment carries out aerating, until this treats that the aerating of aerating equipment terminates.
If in aerating operation, after the compressed natural gas in steel cylinder drains into default discharge value (95%), the same hydraulic control oil automatically of control gear starts to be back to Fuel Tanking Unit 3; And hydraulic oil start backflow while, the steel cylinder controlled to a new store compressed rock gas injects this hydraulic oil, proceed aerating operation; Until treat that the aerating of aerating equipment terminates.
This automatic control mode, environmentally temperature variation accurately controls oil return opportunity, to neglect, and forget oil return because of staff.Adopt this controlling method can avoid hydraulic oil at low ambient temperatures, in long-time delay steel cylinder, thus it is too low effectively to solve hydraulic fluid temperature, can not oil return in time or the halfway problem of oil return after viscosity increases, coordinate Fuel Tanking Unit 3 oil return liquid level cut off point 29a, also effectively can prevent high-pressure natural gas from entering in Fuel Tanking Unit 3 and cause fuel injection event.This kind of controlling method is only being in oil injection operation and the steel cylinder that do not complete of oil injection operation to current, and the oil return carried out especially operates.When there being aerating vehicle (such as second day), through the hydraulic oil in Fuel Tanking Unit 3 is heated, hydraulic oil after heating is injected into the steel cylinder (namely carrying out the current steel cylinder of oil return operation in winter) be not vented completely through oil hydraulic pump, system can recover normal cycling successively afterwards, can not cause hydraulic oil remaining in steel cylinder.
Certainly, preferably by above two kinds of controlling method connected applications, increase hand control switch, while can Non-follow control oil return being carried out, will add low temperature control mode to control gear equally, when ambient temperature is lower, control system is by the timely oil return of setting delay time.The present invention can apply the system of the various control mode of present hydraulic type air entraining substation, illustrate with a concrete refueling system though above, but actual also unrestricted, such as application number for: shown in the Chinese invention patent of 200520133308.X and 200810115135.7, each hydraulic type air entraining substation all can apply above-mentioned controlling method of the present invention.
The controlling method that the present invention provides, overcomes that related domain designer thinks: aerating unit must continue to maintain the technology prejudice of pressurized state.The present invention is temperature variation environmentally, controls to be back in Fuel Tanking Unit after timely for hydraulic oil release, can overcome low temperature and bring technical problem and potential safety hazard.Though need when again continuing to recover pressurization, actual cost far below cost steel cylinder being carried out to moisturizing or temperature correction, and greatly reduces the security of system hidden danger that low temperature brings.Further, utilize controlling method of the present invention not need to adjust system hardware on a large scale, transformation and upgrade cost is lower.
Although it should be pointed out that invention has been described by above-mentioned mode of execution, but the present invention also can have other numerous embodiments.Without departing from the spirit and scope of the present invention; those of ordinary skill in the art obviously can make various corresponding change and distortion to the present invention, but these change and distortion all should belong in the scope that claims of the present invention and equivalent thereof protect.
Claims (10)
1. a hydraulic compressed natural gas air entraining substation controlling method, is characterized in that, treats that the step that aerating equipment carries out aerating comprises to one:
Extract hydraulic oil by oil circuit from a Fuel Tanking Unit, the steel cylinder to a store compressed rock gas injects described hydraulic oil, releases the compressed natural gas stored in described steel cylinder with described hydraulic oil;
The compressed natural gas stored in described steel cylinder arrives an aerator via outlet pipe, utilize described aerator for described in treat that aerating equipment carries out aerating;
The compressed natural gas stored in described steel cylinder does not drain into one and presets discharge value, when described treat the aerating of aerating equipment at the end of, described oil circuit stops in described steel cylinder, note described hydraulic oil and commutation is return line, utilizes compressed natural gas pressure to be back in described Fuel Tanking Unit by hydraulic oil in described steel cylinder;
When in described steel cylinder, described hydraulic oil is back to an oil return cut-off position, described oil circuit stops this oil return action; When carrying out next aerating, continue to described steel cylinder injection liquid force feed, for next treats that aerating equipment carries out aerating, until this treats that the aerating of aerating equipment terminates.
2. hydraulic compressed natural gas air entraining substation controlling method as claimed in claim 1, is characterized in that,
Aforementioned in the described aerating operation treating aerating equipment, when the compressed natural gas in described steel cylinder drains into described default discharge value, described oil circuit stops in described steel cylinder, note described hydraulic oil and commutation is return line, and described hydraulic oil starts to be back to described Fuel Tanking Unit;
While described hydraulic oil starts backflow, the steel cylinder then to a new store compressed rock gas injects described hydraulic oil, proceeds aerating operation; Until described in treat that the aerating of aerating equipment terminates.
3. hydraulic compressed natural gas air entraining substation controlling method as claimed in claim 1, it is characterized in that, when described treat the aerating of aerating equipment at the end of, as as described in the compressed natural gas that stores in steel cylinder do not drain into as described in preset discharge value, with a control gear environmentally temperature determine whether to carry out compressed oil backflow action, and determine the delay time carrying out compressed oil backflow action, and according to described delay time time delay, hydraulic oil in described steel cylinder is back in Fuel Tanking Unit.
4. hydraulic compressed natural gas air entraining substation controlling method as claimed in claim 1, it is characterized in that, when described treat the aerating of aerating equipment at the end of, the compressed natural gas stored in described steel cylinder does not drain into described default discharge value, is back in Fuel Tanking Unit by hydraulic oil in described steel cylinder with Non-follow control.
5. the hydraulic compressed natural gas air entraining substation controlling method as described in any one of Claims 1-4, it is characterized in that, in described Fuel Tanking Unit, there is level meter, described level meter has the highest Liquid level point, minimum liquid level control point and oil return Liquid level point, wherein, below the highest Liquid level point, oil return liquid level cut off point is increased; When compressed natural gas does not drain into default discharge value in described steel cylinder, when hydraulic oil oil return is to described oil return liquid level cut off point in described steel cylinder, stop the oil return action of described hydraulic oil.
6. the hydraulic compressed natural gas air entraining substation controlling method as described in any one of Claims 1-4, is characterized in that, described default discharge value is that described hydraulic oil has accounted for 95% of described steel cylinder volume.
7. hydraulic compressed natural gas air entraining substation controlling method as claimed in claim 5, it is characterized in that, described default discharge value is that described hydraulic oil has accounted for 95% of described steel cylinder volume.
8. a hydraulic compressed natural gas air entraining substation, comprises aerating unit and at least one gas source unit;
Each gas source unit has at least one steel cylinder components; Each steel cylinder components comprises: the steel cylinder of at least one store compressed rock gas, outlet pipe be connected with described steel cylinder, one for controlling the final controlling element of described outlet pipe opening and closing, note return tube be connected with described steel cylinder, one for controlling the final controlling element of described note return tube opening and closing, and the gas path joint be connected with an aerating unit;
Described aerating unit comprises oil circuit device, stores the Fuel Tanking Unit of hydraulic oil, gas path device and the control gear for controlling whole refueling system; Described oil circuit device comprises the selector valve group flowed to the oil hydraulic pump of described steel cylinder supply hydraulic oil, switching controls hydraulic oil, the oil filling pipeline and being connected described steel cylinder note return tube by described selector valve group is switched to the return line of described Fuel Tanking Unit by described selector valve group, it is characterized in that, in described Fuel Tanking Unit, there is level meter, described level meter has the highest Liquid level point, minimum liquid level control point and oil return Liquid level point, wherein, below the highest Liquid level point, oil return liquid level cut off point is increased;
The compressed natural gas stored in described steel cylinder does not drain into one and presets discharge value, at the end for the treatment of the aerating of aerating equipment to one, oil circuit device described in described control gear delays time to control stops in described steel cylinder, note described hydraulic oil and commutation is return line, utilizes compressed natural gas pressure to be back in described Fuel Tanking Unit by hydraulic oil in described steel cylinder; When the described hydraulic oil refluxed makes described Fuel Tanking Unit liquid level to described oil return liquid level cut off point, described control gear controls the oil return action that described oil circuit device stops described hydraulic oil.
9. air entraining substation as claimed in claim 8, it is characterized in that, described Fuel Tanking Unit is provided with heating equipment, and is provided with temperature transducer in Fuel Tanking Unit; According to the data of temperature sensor senses, described control gear controls described heating equipment and heats described hydraulic oil.
10. air entraining substation as claimed in claim 9, it is characterized in that, described heating equipment is anti-explosion electric heating stick.
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