KR102342949B1 - Method and vehicle mounted type apparatus for lpg quantitative test using thereof - Google Patents

Abstract

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

Description

Vehicle-mounted LPG inspection device and LPG injection quantity suitability inspection method using the same

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 more particularly, a quantitative supply of LPG samples at a charging station site, etc. It relates to a quantitative test method and device that can quickly check whether

LPG is largely divided into household, commercial and automobile uses. There are LPG quality standards to ensure the performance of these LPGs, and the quality must always be maintained accordingly.

In particular, since the quality standards for summer (April to October) and winter (November to March of the following year) are different, if the LPG quality standards are not met during the changing season, consumer damage and air pollution may occur. can be In fact, in the case of a changeover season, there are many cases in which the existing summer LPG and winter LPG are not completely replaced, so they do not meet the quality standards.

In addition to these quality inspections, LPG injection quantity suitability inspection is performed through quantitative inspection. Recently, the Ministry of Trade, Industry and Energy has completed the revision of subordinate statutes to stipulate the tolerance, inspection method, and violation of the Liquefied Petroleum Gas Business Act for the quantitative inspection of LPG.

In the existing quantitative test of LPG injection amount, the weighing method was used as an inspection method. The weight measurement method is to first measure the LPG density and temperature through a density flotation meter, obtain the converted density by applying the 15℃ conversion standard, and then inject the LPG using a single-ball container, and then use an electronic scale to weigh the LPG measure Finally, the weight, converted density, and filling amount were calculated in the same way as in Equation 1 below to check the tolerance.

W: Weight (kg) of liquefied petroleum gas measured in the container for inspection,

d: 15℃ conversion density (g/cm ³ )

I: The amount of filling indicated on the liquefied petroleum gas filling machine (L)

In the case of quantitative measurement by the weighing method of Equation 1, there is a possibility that the error value may be changed depending on the measurement conditions (the position at which the scale is read, weather conditions, etc.) while measuring the scale of the density flotation meter with the naked eye, and the residual gas Difficulties arise in recovering. In addition, there were many inconveniences such as taking about 30 minutes for the examination time.

Therefore, in the present invention, as described above, the LPG inspection device that can easily determine whether the injection amount of LPG is supplied in a quantitative manner at the same time as charging at the charging station site, and the recovery that can safely recover the remaining LPG after the measurement 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 and recovery equipment in the vehicle.

The present invention provides a method and apparatus for quickly and easily inspecting whether an LPG injection amount is supplied in a quantitative manner to a vehicle-mounted inspection device in the field, and simply recovering liquefied petroleum gas after the inspection, in order to solve the problems of the prior art 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 charging liquefied petroleum gas from a charging station; an inspection unit for quantitatively inspecting the liquefied petroleum gas stored in the charging tank; and a liquefied petroleum gas recovery device for discharging the liquefied petroleum gas filled in the charging tank after being inspected by the inspection unit.

In addition, the inspection unit determines the converted density based on the 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 and weight information, and the filling amount.

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

In addition, the liquefied petroleum gas recovery device includes a pipe through which the filled liquefied petroleum gas is recovered to the charging station.

In addition, the liquefied petroleum gas recovery device is set so that the liquefied petroleum gas filled in the charging tank is introduced into the fuel tank of the vehicle.

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

In addition, the inspection unit is configured to pre-discharge and inspect the air in the inspection vehicle pipe to a predetermined capacity or more for air separation, etc. in a state in which the engine of the inspection vehicle is turned off.

Another embodiment of the present invention relates to a method for quantitative inspection of liquefied petroleum gas, the method 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 acquired temperature information, density information, and weight information; and discharging the liquefied petroleum gas filled in the charging 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 into the fuel tank of the vehicle.

In addition, the step of discharging the filled liquefied petroleum gas is characterized in that it is transferred to the storage tank of the liquefied petroleum gas recovery device from the filled single-ball container after measuring the weight of the filled liquefied petroleum gas.

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

According to the present invention, there is an advantageous effect that the liquefied petroleum gas filled for inspection can be easily recovered.

In addition, there is an advantageous effect of solving the safety problem of the inspector that may occur during the movement of heavy containers for inspection in the field.

Because quantitative inspection is accurately and precisely measured, it is possible to prevent damage to LPG consumers in advance by cracking down on business operators who maliciously sell under-quantitative products.

In addition, it is possible to share the test results of LPG from the outside in real time through wireless communication with the data being inspected at the site. In other words, it is connected to the operation program of the data processing device such as a laptop 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 inspection equipment according to an example of the present invention.
2 to 3 are diagrams conceptually illustrating the structure of an inspection vehicle according to an example of the present invention.
4 is a flowchart illustrating a vehicle-mounted LPG quantitative inspection method according to an example of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

In the present invention, "Liquefied Petroleum Gas (LPG)" is called LPG, and it is liquefied by pressurizing the gas at room temperature with hydrocarbons having a low boiling point such as propane and butane among petroleum components. .

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

As shown in FIG. 1 , vehicle-mounted LPG quantitative inspection equipment may be used for quantitative inspection of LPG filling stations.

In general, quantitative inspection of fuels is a necessary part for the formation of a fair trade order and consumers who purchase fuels. Accordingly, the Ministry of Trade, Industry and Energy has promulgated the enforcement rules for the full-scale implementation of the quantitative inspection system for liquefied petroleum gas (LPG) for automobiles. It specifically stipulates the criteria for disposition, the subject of publication, and the contents.

To be more specific, the inspection target is a charging company that handles liquefied petroleum gas, and a company that charges a container fixed to a vehicle. That is, LPG filling station operators may fall under this.

In quantitative inspection, the allowable error is -1.5%, and if it exceeds -300ml based on 20 liters of measurement, it can be defined as a violation of the duty to supply quantitatively. First, the Coriolis flow rate is measured as the first simple test, and if the result of the first simple test is out of the allowable error, a formal test of the weight measurement is carried out.

Administrative measures as shown in Table 1 below are applicable to violators who violate the duty to supply quantity.

division under-quantitative business facilities
Installation/remodeling under-quantitative
business facilities
Installation/remodeling passage room otherwise 60 days of business suspension Permission revocation 1 violation warning 30 days of business suspension Permission revocation - 2 violations 30 days of business suspension 60 days of business suspension - - 3 violations 60 days of business suspension Permission revocation - - 4 violations Permission revocation - - -

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 amount by simultaneously measuring mass, density, and temperature using a vibration method when liquid LPG flows into a Coriolis flow meter. This is a greatly improved method compared to the existing method in which the temperature and density are measured in advance, the volume is calculated by measuring the weight of the container after LPG filling, 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 inspection vehicle 10 through the charger 20 of the LPG filling station, it passes through the mass flow meter 100 of the inspection vehicle 10, and the mass flow meter 100 performs quantitative inspection of the LPG being charged. carry out

The LPG recovery device 200 allows the quantitatively inspected LPG to be discharged from the charging tank of the inspection vehicle 10 . At this time, there are three main methods for discharging from the filling tank. The first method is a method of recovering 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 the inspection vehicle It is a method of transferring to the fuel tank of (10). The third method is to transfer the filled single-ball container to the storage tank of the recovery device after weighing.

In the prior art, in order to perform a quantitative test, it was necessary to spend a considerable amount of time to discharge the LPG from the container again after the test was carried out by filling the LPG container and measuring the weight of the container. recovery is possible.

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

2 to 3 are diagrams conceptually illustrating 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 chest of drawers 11 , a forced ventilation fan 12 , an air reel 13 , an electric wire reel 14 , a stationary fire extinguisher 15 , and a bulkhead 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 to have a structure in which quantitative inspection can be performed in the inspection vehicle 10 .

Since the inspection vehicle 10 is equipped with the 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 Vehicle Management Act. In addition, the floor inside the vehicle of the loading box equipped with equipment may be installed with plywood with a thickness of 18 T (mm) or more to form a base floor, and 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 separately separated. In addition, the inspection vehicle 10 is equipped with safety facilities such as a ventilation hole, a ventilator, a gas leak detector, and a fire extinguishing device, so that fire and explosion accidents can be prepared. As shown in FIG. 3 , a separate space may be provided inside the vehicle in which an electronic scale, a density flotation meter, and a single-ball container used for a weight measurement method, which is a formal inspection, can be loaded.

4 is a flowchart illustrating a vehicle-mounted LPG quantitative inspection method according to an example of the present invention.

As a vehicle-mounted LPG quantitative inspection method, for quantitative inspection, it can be carried out with the engine of the inspection vehicle turned off.

First, liquefied petroleum gas is filled into the liquefied petroleum gas filling tank of the inspection vehicle through a pipe connected to the charging station (S410). At this time, 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.

The equipment for quantitative measurement is provided between the filling tank inlet of the inspection vehicle and the filling tank, and the port of the inlet tube (pipe) has a structure that can be combined with the dispenser (charger) of the charging station (quick coupling). At this time, the outlet tube is connected using the LPG recovery device of the inspection vehicle and the hose pipe for LPG.

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

The Coriolis mass flow meter measures the temperature, density, weight, etc. of the filled LPG and is connected to the pipe so that it is 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 abrupt flow rate or pressure change. It has an advantageous effect of providing a safe inspection environment for inspectors who perform inspections through safety devices such as needle valves.

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

If the inspection result is out of the allowable error, a formal inspection using a weight measurement method other than the simple inspection method through the Coriolis mass flowmeter is performed. this can be taken down

After the quantitative test in the Coriolis mass flow meter has been completed, the LPG is moved to the charging tank, and the filled LPG is discharged to the LPG recovery device of the test vehicle (S440).

The LPG recovery apparatus according to the present invention mainly discharges LPG in three ways, the first method is to transfer it to the storage tank of the charging station, and the second method is to transfer the LPG to the fuel tank of the inspection vehicle. The third method is to transfer the filled single-ball container to the storage tank of the recovery device after weighing.

The LPG recovery device according to the present invention may include 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 equipment according to 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 of the recovery tank (including the 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 (2.0 MPa) is installed in front of the relief valve.

The LPG recovery device may include a grounding terminal for removing LPG static electricity and a viewing window through which the liquid flow can be visually checked.

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

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

The description of the present invention described above is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms 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 restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents 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 (4)

In the quantitative inspection method of liquefied petroleum gas,
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 acquired temperature information, density information, and weight information; and
discharging the liquefied petroleum gas filled in the charging tank;
Including, liquefied petroleum gas quantitative test method. According to claim 1,
The step of discharging the filled liquefied petroleum gas,
Liquefied petroleum gas quantitative inspection method, characterized in that the discharge through a liquefied petroleum gas recovery device for recovering the liquefied petroleum gas filled with the loading arm of the charging station. According to claim 1,
The step of discharging the filled liquefied petroleum gas,
Liquefied petroleum gas quantitative inspection method, characterized in that the transfer into the fuel tank of the vehicle. According to claim 1,
The step of discharging the filled liquefied petroleum gas,
After measuring the weight of the filled liquefied petroleum gas, the liquefied petroleum gas quantitative test method, characterized in that it is transferred from the filled single-ball container to the storage tank of the liquefied petroleum gas recovery device.

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