KR102190371B1 - Method and vehicle mounted type apparatus for lpg quantitative test using thereof - Google Patents

Abstract

The present invention relates to an inspection vehicle for a quantitative test of liquefied petroleum gas. The inspection vehicle includes: a charging tank charging the liquefied petroleum gas from a charging station; an inspection part performing a quantitative test of the liquefied petroleum gas stored in the charging tank; and a liquefied petroleum gas recovery device discharging the liquefied petroleum gas charged in the charging tank after the liquefied petroleum gas is inspected in the inspection part. Therefore, the inspection vehicle can quickly and easily inspect whether a fixed amount of LPG is supplied in the site and can simply recover the liquefied petroleum gas after the inspection.

Description

Vehicle-mounted LPG inspection device and LPG injection quantity conformance inspection method using the same{METHOD AND VEHICLE MOUNTED TYPE APPARATUS FOR LPG QUANTITATIVE TEST USING THEREOF}

The present invention relates to a vehicle-mounted liquefied petroleum gas (LPG, hereinafter referred to as'LPG') inspection device and a method for testing the suitability of an LPG injection amount using the same, and in more detail, an LPG sample is supplied quantitatively at a charging station, etc. It relates to a quantitative test method and device that can quickly check whether it is.

LPG is largely divided into household, commercial and automotive use. In order to secure the performance of these LPGs, there are LPG quality standards, and accordingly, quality must always be maintained.

In particular, because the quality standards for summer use (April to October) and winter use (November to March of the following year) are different, if the LPG quality standards are not met during the changing season, the cause of consumer damage and air pollution It is also possible. In fact, in the case of the turnaround season, there are many cases that do not meet the quality standards because the existing summer LPG and winter LPG are not completely replaced.

In addition to these quality checks, LPG injection quantity conformity tests are also conducted through quantitative tests. Recently, the Ministry of Trade, Industry and Energy has completed the revision of sub-laws to stipulate tolerances for under-quantified supply, inspection methods, and disclosure of violations in the Liquefied Petroleum Gas Business Act for quantitative LPG inspection.

In the conventional quantitative test of LPG injection amount, a weight measurement method was used as a test method. To measure the weight, first measure the LPG density and temperature through a density add-on, and then apply the conversion standard at 15℃ to obtain the converted density, and then inject LPG using a flat-mouthed container, and then use an electronic balance to weigh the LPG. Measure Finally, the weight, the converted density, and the filling amount were calculated in the same manner as in Equation 1 below to check the tolerance.

W: Liquefied petroleum gas weight (kg) measured in the inspection container,

d: 15℃ conversion density (g/cm ³ )

I: Charge amount displayed on the liquefied petroleum gas filling machine (L)

In the case of quantitative measurement using the weight measurement method of Equation 1, while measuring the density sublimation scale with the naked eye, there is a possibility that the error value may fluctuate depending on the measurement conditions (the position where the scale is read, weather conditions, etc.), and the residual gas Difficulty arises in recovering. In addition, there were many inconveniences, such as taking about 30 minutes for the test.

Therefore, in the present invention, as described above, an LPG inspection device that can easily determine whether the amount of LPG injected is supplied in a quantitative manner at the same time as charging at the charging station site, and the number of times that the remaining LPG can be safely recovered to the charging station storage tank. It is intended to provide a method for quantitative inspection in a vehicle by manufacturing a device and mounting an integrated device for measuring equipment and collection equipment on a vehicle.

The present invention is to solve the above-described problems of the prior art, and a method and apparatus for quickly and easily inspecting whether a quantity of LPG injection is supplied to a vehicle-mounted inspection device in the field, and simply recovering liquefied petroleum gas after the inspection. to provide.

An embodiment of the present invention relates to an inspection vehicle for quantitative inspection of liquefied petroleum gas, the inspection vehicle comprising: a charging tank for filling liquefied petroleum gas from a charging station; An inspection unit for performing a quantitative inspection of the liquefied petroleum gas stored in the filling tank; And a liquefied petroleum gas recovery device for discharging the liquefied petroleum gas filled in the filling tank after being inspected by the inspection unit.

Further, the inspection unit determines a converted density based on temperature information, density information, and weight information of the filled liquefied petroleum gas, and determines whether it is within an allowable error range based on the converted density, weight information, and filling amount.

In addition, when it is determined that the final error value of the converted density is out of a preset allowable error range, the inspection unit is set to perform a quantitative inspection of the filled liquefied petroleum gas using an electronic balance, a density add-on meter, and a flattened container. do.

In addition, the liquefied petroleum gas recovery device includes a pipe for recovering the filled liquefied petroleum gas to the filling station.

In addition, the liquefied petroleum gas recovery device is set so that the liquefied petroleum gas charged in the filling tank is transferred to the fuel tank of the vehicle.

In addition, the liquefied petroleum gas recovery device is set to be transferred from the filled flat-ball container to the storage tank of the recovery device after weighing the filled liquefied petroleum gas.

In addition, the inspection unit is set to pre-discharge and inspect air in the inspection vehicle piping above a predetermined capacity for air separation or the like when the inspection vehicle is turned off.

Another embodiment of the present invention relates to a method for quantitatively inspecting liquefied petroleum gas, comprising: charging liquefied petroleum gas into a liquefied petroleum gas filling tank of a vehicle through a pipe connected to a charging station; Obtaining temperature information, density information, and weight information of the filled liquefied petroleum gas; Determining a converted density using the obtained temperature information, density information, and weight information; And discharging the liquefied petroleum gas filled in the filling tank.

In addition, the step of discharging the filled liquefied petroleum gas is discharged through a liquefied petroleum gas recovery device for recovering the filled liquefied petroleum gas to the loading arm of the charging station.

In addition, the step of discharging the filled liquefied petroleum gas is characterized in that the transfer to the fuel tank of the vehicle.

In addition, the step of discharging the filled liquefied petroleum gas may include weighing the filled liquefied petroleum gas and transferring the filled liquefied petroleum gas to a storage tank of the liquefied petroleum gas recovery device from the filled flattened container.

According to the present invention, it is possible to quickly and accurately perform a quantitative LPG test through a mass flow meter mounted on a vehicle in the field.

According to the present invention, there is an advantageous effect of being able to easily recover the filled liquefied petroleum gas for inspection.

In addition, there is an advantageous effect of solving the safety problem of inspectors that may occur while moving heavy containers for inspection in the field.

Since the quantitative test is measured accurately and precisely, it is possible to prevent damage to LPG consumers in advance by cracking down on businesses that maliciously sell under-quantity.

In addition, it is possible to share the test results of LPG in real time from outside through wireless communication of data being inspected in the field. In other words, it is connected to the operating program of data processing devices such as a notebook computer in the field, and inspection results can be checked both on-site and outside.

1 is a view showing a vehicle-mounted LPG quantitative test equipment according to an example of the present invention.
2 to 3 are views conceptually showing the structure of an inspection vehicle according to an example of the present invention.
4 is a flow chart showing a vehicle-mounted LPG quantitative test method according to an example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element interposed therebetween. . In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

In the present invention, “Liquefied Petroleum Gas (LPG)” is called LPG, and is liquefied by pressurizing gas at room temperature as a main component of hydrocarbons with low boiling points such as propane and butane among petroleum components. .

1 is a view showing a vehicle-mounted LPG quantitative test equipment according to an example of the present invention.

As shown in FIG. 1, a vehicle-mounted LPG quantitative inspection equipment may be used for quantitative inspection of an LPG charging station.

In general, quantitative inspection of fuels is an essential part to establish a fair trade order and consumers who purchase fuel. Therefore, the Ministry of Trade, Industry and Energy has promulgated the enforcement rules for the full-scale implementation of the LPG quantitative inspection system for automobiles, and according to the safety management and business law of liquefied petroleum gas, the method of inspection for violation of the obligation to supply quantitatively, administration for each violation. The criteria for disposition, the subject of publication, and the content are specified in detail.

More specifically, the subject of inspection is a filling business that handles liquefied petroleum gas, and is a business that fills a container fixed to a vehicle. That is, LPG charging station operators may correspond to this.

In the quantitative test, the tolerance is -1.5%, based on the measurement of 20 liters, if it exceeds -300ml, it can be prescribed as a violation of the obligation to supply quantitatively. First, Coriolis flow measurement is performed as the first simple test, and if the result of the first simple test is out of tolerance, a formal test of weighing is performed.

Violating business operators who have violated their obligation to supply quantity are subject to administrative dispositions as shown in Table 1 below.

division Less than quantitative Business facilities
Installation and remodeling Less than quantitative
Business facilities
Installation and remodeling Progress room Otherwise Business suspension 60 days Cancellation of permission 1 violation warning 30 days of business suspension Cancellation of permission - 2 violations 30 days of business suspension Business suspension 60 days - - 3 violations Business suspension 60 days Cancellation of permission - - 4 violations Cancellation of permission - - -

As the mass flow measurement method introduced in the above inspection operation, the Coriolis Flow Meter method is applied. Coriolis flow measurement is a simple method that calculates the quantity by simultaneously measuring mass, density, and temperature using a vibration method when liquid LPG flows into the Coriolis flow meter. This is a significantly improved method compared to the conventional method in which the temperature and density are measured in advance, the volume is calculated by measuring the weight of the container after filling LPG, and the error is calculated according to the calculation method.

As shown in FIG. 1, the LPG quantitative test is performed in the inspection vehicle 10. When LPG is injected (charged) into the test vehicle 10 through the charger 20 of the LPG charging station, it passes through the mass flow meter 100 of the test vehicle 10, and the mass flow meter 100 quantitatively inspects the LPG being charged. Perform.

The LPG recovery device 200 allows the LPG for which the quantitative test has been performed to be discharged from the charging tank of the test vehicle 10. At this time, there are three ways to be discharged from the filling tank. The first method is a method of recovering the LPG stored in the storage tank of the LPG recovery device 200 to the storage tank 50 of the charging station using the compressor 30 and the loading arm 40 of the charging station, and the second method is a test vehicle. This is a method of transferring to the fuel tank of (10). The third method is to transfer the weight from the filled flat-mouthed container to the storage tank of the recovery device after weighing.

Conventionally, in order to perform a quantitative test, a considerable amount of time had to be spent in order to discharge LPG from the container again after filling the LPG container and weighing the container to perform the test. However, in accordance with the present invention, LPG It is possible to recover.

In order to discharge the measured LPG from the inspection vehicle 10, the filling tank may be pressurized with a self pump or a filling station compressor. The self-pump takes about 40 to 50 minutes based on 100L, and about 10 minutes with the filling station compressor. When recovering to the charging station storage tank 50, the loading arm liquid/gas line and the liquid/gas line of the recovery device are connected.

2 to 3 are views conceptually showing the structure of an inspection vehicle according to an example of the present invention.

2 is a left side view of an inspection vehicle according to an example of the present invention. The inspection vehicle 10 includes a flow meter 100, a drawer 11, a forced ventilation fan 12, an air reel 13, an electric wire reel 14, a stationary fire extinguisher 15 and a partition wall 16.

In addition, as shown in FIG. 3, the inspection vehicle 10 may include an electronic scale 130 in the drawer 11, and a formal inspection of a weight measurement method can be performed using the electronic scale 130. have.

The inspection vehicle 10 includes a flow meter 100, a gauge 110, and a density meter storage box 120, and is designed in a structure in which a quantitative inspection can be performed within the inspection vehicle 10.

Since the inspection vehicle 10 is equipped with integrated equipment of the flow meter 100 and the LPG recovery device, it is manufactured as a special vehicle by receiving self-certification according to Article 30 of the Automobile Management Act. In addition, the interior floor of the vehicle in which the equipment is mounted may be installed with plywood having a thickness of 18 T (mm) or more to form a foundation floor, and a Luck-Strong flooring may be installed on the top of the plywood.

In the inspection vehicle 10, a separate partition may be installed behind the driver's seat so that the driver's seat and the equipment room of the vehicle can be separated. In addition, the inspection vehicle 10 is provided with safety equipment such as a vent, a ventilator, a gas leak detector, and a fire extinguishing device to prepare for fire and explosion accidents. As shown in FIG. 3, a separate space may be provided inside the vehicle in which an electronic scale, a density liquid meter, and a flat-mouthed container used for a weighing method, which is a formal inspection, can be loaded.

4 is a flow chart showing a vehicle-mounted LPG quantitative test method according to an example of the present invention.

As a vehicle-mounted LPG quantitative test method, it can be carried out in a state where the test vehicle is turned off for quantitative testing, and after the mass flow meter and pipes are connected, about 5L or more can be pre-discharged for air separation.

First, liquefied petroleum gas is filled into the liquefied petroleum gas charging tank of the inspection vehicle through a pipe connected to the charging station (S410). In this case, the filling tank is not a fuel tank in which fuel for operation of the inspection vehicle is stored, but a filling tank for storing LPG to be inspected.

Equipment for quantitative measurement is provided between the charging tank inlet and the charging tank of the inspection vehicle, and the port of the inlet tube (pipe) is structured to be able to be coupled (Quick Coupling) with the dispenser (charger) of the charging station. At this time, the outlet tube is connected using the LPG recovery device of the inspection vehicle and the LPG hose pipe.

The Coriolis Flow Meter is fixed in a case made in the form of a stainless steel rack between the pipe and the filling tank so that LPG passing through the inlet tube is measured. For fixation, the Coriolis mass flowmeter can be fixed at the midpoint of the inlet tube.

The Coriolis mass flowmeter measures the temperature, density, weight, etc. of the charged LPG and is connected to the pipe to be moved to the filling tank (S420).

At this time, a needle valve is installed in the inlet tube to remove air bubbles that may be generated during measurement and to prevent rapid flow or pressure changes. It has an advantageous effect of providing a safe inspection environment for inspectors performing inspection through safety devices such as needle valves.

The data processing unit of the inspection equipment determines the converted density by using the temperature information, density information, and weight information of LPG obtained from the mass flowmeter (S430). The data processing unit finally calculates the error from the 15°C conversion density through the measured value of LPG input to the preset operation program.

If the test result is out of the tolerance, a formal test of the weight measurement method other than the simple test method through the Coriolis mass flowmeter is performed.If the test result in the weight measurement method is also outside the tolerance, the administrative disposition of the competent administrative agency This can be down.

After the quantitative test by the Coriolis mass flow meter, the LPG is moved to the charging tank, and the charged LPG is discharged to the LPG recovery device of the test vehicle (S440).

The LPG recovery apparatus according to the present invention largely discharges LPG in three ways, the first is a method of transferring it to a storage tank of a filling station, and the second is a method of transferring it to a fuel tank of an inspection vehicle. Third, after weighing, it is transferred from the filled flat-mouthed container to the storage tank of the recovery device.

The LPG recovery device according to the present invention may be composed of a storage tank, a pump, a combustion facility, an overcharge prevention device, a liquid level gauge, a safety valve, a pressure gauge, a flexible metal hose, a loading arm coupling, and the like. Preferably, the manufacturing and inspection standards for specific facilities in accordance with Article 3, No. 5 of the High Pressure Gas Safety Management Act may be applied.

In the LPG recovery device, a safety valve is installed in the gas phase part of the recovery tank (including a container) and a bypass relief valve is installed in the pump discharge part so that gas can be automatically discharged when the pressure rises abnormally. In addition, a stop valve (2.0MPa) is installed at the front end of the relief valve.

The LPG recovery device may include a ground terminal for removing LPG static electricity and a viewing window for visually checking the flow of liquid.

Rubber and non-metallic materials (except those built into the compressor) that come into contact with the gas in the LPG recovery device are in LPG liquid (15-35 mol% C3 hydrocarbons, more than 60 mol% C4 hydrocarbons) at -20℃ for 24 hours at 20℃. When maintained for 48 hours, there is no abnormality such as embrittlement, softening, and expansion, and the mass change rate is within +20 to -10%.

Although the methods and systems of the present invention have been described in connection with specific embodiments, some or all of their components or operations may be implemented using general-purpose structures.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

10: inspection vehicle
100: mass flow meter
200: LPG recovery device

Claims (11)

In the inspection vehicle for quantitative inspection of liquefied petroleum gas,
The inspection vehicle,
A filling tank for filling liquefied petroleum gas from a filling station;
An inspection unit for performing a quantitative inspection of the liquefied petroleum gas stored in the filling tank; And
A liquefied petroleum gas recovery device for discharging liquefied petroleum gas filled in the filling tank after being inspected by the inspection unit;
Including,
The inspection unit,
Determining a converted density based on temperature information, density information, and weight information of the charged liquefied petroleum gas, determining whether it is within an allowable error range based on the converted density and the weight information and filling amount,
The inspection unit,
When it is determined that the final error value of the converted density is out of a preset tolerance range,
Characterized in that it is set to perform a quantitative test of the filled liquefied petroleum gas using an electronic balance, a density liquid meter, and a flat container. delete delete The method of claim 1,
The liquefied petroleum gas recovery device,
And a pipe for recovering the filled liquefied petroleum gas to the charging station. The method of claim 1,
The liquefied petroleum gas recovery device,
Characterized in that the liquefied petroleum gas charged in the charging tank is set to be introduced into the fuel tank of the vehicle. The method of claim 1,
The liquefied petroleum gas recovery device,
After measuring the weight of the filled liquefied petroleum gas, it is characterized in that it is set to be transferred to the storage tank of the recovery device from the filled flat container. The method of claim 1,
The inspection unit,
The inspection vehicle, characterized in that in a state in which the start of the inspection vehicle is turned off, the air in the pipe of the inspection vehicle is pre-discharged and inspected by a predetermined capacity or more. delete delete delete delete

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