CN218411383U - LNG adds online calibrating installation of mechanism of qi - Google Patents

Abstract

The utility model discloses a LNG adds online calibrating installation of mechanism of qi, it includes liquid phase examination pipeline, gaseous phase examination pipeline, the unloading pipeline is used for carrying out the operation of unloading to liquid phase examination pipeline and gaseous phase examination pipeline, liquid phase examination pipeline includes liquid phase standard flowmeter, the liquid phase export, the access connection of liquid phase standard flowmeter is to the liquid feeding rifle interface of being examined the mechanism of qi, the exit linkage of liquid phase standard flowmeter is to the vacuum box, the vacuum box is connected with flow control valve, flow control valve is connected to the liquid phase export, wherein, gaseous phase examination pipeline includes gaseous phase interface air entrainment rifle, gaseous phase standard flowmeter, gaseous phase interface air entrainment rifle is connected to gaseous phase standard flowmeter via the vacuum box, the exit linkage of gaseous phase standard flowmeter returns to the vacuum box, be connected to the return port of being examined the mechanism of qi via the vacuum box, the unloading pipeline includes the drain, it is connected to gaseous phase atmospheric valve, the liquid phase air release valve, the relief valve is all drawn forth from the vacuum box.

Description

LNG adds online calibrating installation of mechanism of qi

Technical Field

The utility model belongs to the technical field of gas flow measurement, concretely relates to LNG adds online calibrating installation of mechanism of qi.

Background

LNG needs to be measured as a commodity, and an LNG dispenser needs to be forcibly verified as a measuring instrument for trade handover.

Conventional positive displacement meters must be sent to a specific metering department and calibrated off-line using a specific calibration device. The calibration devices of the standard container method and the standard volumetric tube method are large in equipment and complex in operation, cannot realize automation of online calibration, and are generally applied to offline calibration.

In addition, most of the existing LNG dispenser calibrating devices are of box structures or skid-mounted structures, and are hoisted and transported to a calibrating site by trucks. The mobility is poor, and the multi-place itinerant verification is not facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the traditional verification device, the invention provides a more accurate and more convenient metrological verification mode by adopting a standard table method according to the national metrological verification regulations of the liquefied natural gas dispenser, solves the problem of verification of the LNG dispenser in the follow-up verification and use, ensures the fairness and accuracy of LNG trade handover, avoids trade disputes and has great social benefit and economic benefit.

According to the embodiment of the utility model, an on-line verification device for an LNG dispenser is provided, which is characterized by comprising a liquid phase verification pipeline, a gas phase verification pipeline and a vent pipeline,

wherein the emptying pipeline is used for emptying the liquid phase verification pipeline and the gas phase verification pipeline,

wherein the liquid phase verification pipeline comprises a liquid phase standard flowmeter (3) and a liquid phase outlet (22), an inlet of the liquid phase standard flowmeter (3) is connected to a liquid adding gun interface (84) of the detected gas dispenser, an outlet of the liquid phase standard flowmeter (3) is connected to the vacuum box (20),

the vacuum box (20) is connected with a flow regulating valve (89), the flow regulating valve (89) is connected to the liquid phase outlet (22),

wherein the gas phase verification pipeline comprises a gas phase interface air filling gun (14) and a gas phase standard flowmeter (42), the gas phase interface air filling gun (14) is connected to the gas phase standard flowmeter (42) through the vacuum box (20), an outlet of the gas phase standard flowmeter (42) is connected back to the vacuum box (20) and is connected to an air return port (11) of the detected air filling machine through the vacuum box (20),

the emptying pipeline comprises an emptying opening (85) which is connected to a gas-phase emptying valve (86), a liquid-phase emptying valve (87) and a safety valve (88), and the gas-phase emptying valve (86), the liquid-phase emptying valve (87) and the safety valve (88) are led out of the vacuum box (20).

According to the utility model discloses an embodiment, vacuum box (20) are connected with temperature transmitter (33), pressure transmitter (35).

According to the utility model discloses an embodiment, vacuum box (20) still are connected with mechanical manometer (10).

According to an embodiment of the invention, the vacuum box (20) is connected to the gas phase blow-down valve (86) and the return air opening (11) via check valves.

According to the utility model discloses an embodiment, LNG adds mechanism of qi on-line verification device is on-vehicle mobile device, liquid phase export (22) are connected to on-vehicle storage tank.

According to the embodiment of the utility model, LNG adds online calibrating installation of mechanism of qi still holds including being used for the liquid phase examine and determine the pipeline the gaseous phase examine and determine the pipeline with the ultralow temperature insulation box body of unloading pipeline, the liquid phase examine and determine the pipeline the gaseous phase examine and determine the pipeline with the unloading pipeline adopts stainless steel vacuum hose.

The utility model discloses an advantage and beneficial effect that embodiment has include:

1. the LNG dispenser metering and calibrating device is typical multi-place mobile application equipment, is good in mobility, is beneficial to multi-place itinerant calibration, does not need to disassemble and assemble the LNG dispenser, and conducts calibration in the working state of the LNG dispenser.

2. The LNG dispenser metering and calibrating device can be integrally modified by an engineering truck, so that the calibrating device and the truck can form a special calibrating truck with an integrated structure, and the characteristics of special maneuverability of movable equipment and attractiveness of integral design of the calibrating device and the truck are realized;

3. the safe and effective working conditions of the LNG dispenser metering and calibrating device are guaranteed due to the arrangement of the emptying pipeline and the ultralow-temperature heat-insulating box body.

Drawings

Fig. 1 is a schematic view of the working principle of a metering and calibrating device for an LNG dispenser according to an embodiment of the present invention;

fig. 2 to 4 are according to the utility model discloses a LNG adds mechanism of qi metrological verification device's different visual angles's structure chart.

The reference numerals and corresponding descriptions for the various components in the figures are as follows:

Detailed Description

The following describes in detail preferred embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and various changes can be made to the idea of the present invention to extend various different forms of realization, which are all within the scope of the present invention.

Fig. 1 is according to the utility model discloses a LNG adds mechanism of qi metrological verification device's theory of operation schematic diagram.

As shown in fig. 1, the working principle of the calibrating apparatus mainly involves three pipelines, namely, a liquid filling gun interface of a gas dispenser → a liquid phase outlet of the calibrating apparatus; second, the gas phase interface of the calibrating device → the air return gun interface of the air dispenser; and the third is the relief (emptying) port of the two pipelines.

The LNG filling machine liquid filling gun interface is a standard liquid filling gun seat. When checking, the LNG dispenser liquid feeding gun is inserted. A liquid phase outlet of the verification device is connected with a vacuum hose with a standard liquid adding gun, and the LNG dispenser is inserted into a circulating liquid return port during single liquid phase verification; and inserting the vehicle-mounted storage tank during the complete machine verification. A liquid phase standard flowmeter is connected in series in the calibrating device between the two interfaces, and a check valve is arranged at the rear end of the flowmeter to prevent backflow; the temperature transmitter and the pressure transmitter on the pipeline are used as auxiliary metering parameter acquisition and state monitoring. One way behind the check valve is connected with the safety valve and then is discharged to the vent, the pressure is automatically relieved when the pipeline is over-pressurized, and the other way is connected with the stop valve and then is discharged to the vent for emptying the pipeline when the verification is finished. The process lines and equipment connections of the gas phase interface are basically the same as the liquid phase pipeline principle, and are not described in detail herein.

As shown by dotted lines in FIG. 1, the electric instrument on the pipeline of the verification device is connected into the PLC explosion-proof instrument box through a cable. When the system works, the instrument parameters are acquired, operated and processed by the PLC and displayed on the field liquid crystal display.

Fig. 2 to 4 are according to the utility model discloses a LNG adds mechanism of qi metrological verification device's different visual angles's structure chart.

Wherein, the liquid filling gun interface 84 of the detected gas filling machine is directly connected to the liquid phase standard flowmeter (low temperature mass flowmeter) 3, and the pipeline is very short, so as to directly measure the flow of the gas filling machine outlet. The outlet of the liquid phase standard flowmeter 3 enters a vacuum box 20, and a temperature transmitter 33 and a pressure transmitter 35 are embedded in the vacuum box; a check valve is connected in the vacuum box 20, and the check valve and the vacuum box 20 are respectively connected to a safety valve 88, a liquid phase emptying valve 87 and a mechanical pressure gauge 10. The vacuum box 20 is also connected with a flow control valve 89, and the flow control valve 89 is led out of the vacuum box 20 through a handle. The outlet of the flow regulating valve 89 is connected to the liquid phase outlet 22. In the figure, 25, 26, 27 and 28 form a bidirectional gas filling gun (filling gun) and a hose assembly, one end of the bidirectional gas filling gun is connected to the liquid phase outlet 22, and the other end of the bidirectional gas filling gun is connected to a gas filling machine liquid phase circulation port or an LNG storage tank.

The air return gun 14 of the gas phase interface of the certification device is connected to the vacuum box 20 through the rotary joint 15 and the air return gun connector 16 and the hose 13. After the temperature transmitter joint 33 and the pressure transmitter 35 are led out from the vacuum box 20, the vacuum box is led out and connected to a gas phase flowmeter (low-temperature mass flowmeter) 42; the outlet of the gas phase flowmeter 42 is returned to the vacuum box, a check valve is connected in the vacuum box, and the check valve leads out two lines of the vacuum box 20 and is connected to the gas phase emptying valve 86 and the gas return port 11.

Meanwhile, the vent 85 is connected to a gas phase vent valve 86, a liquid phase vent valve 87, and a safety valve 88.

Because LNG is ultralow temperature liquid, needs to prevent gasification, this design adopts double-deck high vacuum thermostated container special stainless steel ultra-vacuum whole insulation can, with the ultralow temperature equipment and the process line of calibrating installation sealed in the box, under the ultralow temperature LNG medium effect of-146 to-166 ℃, the outside does not frost. The liquid feeding pipe and the liquid return pipe are all stainless steel vacuum hoses, so that the gasification amount of the medium is reduced. The ultralow temperature pipeline is provided with a safety relief valve, and the safety relief valve is automatically opened to relieve pressure when the working pressure of the gas dispenser is too high.

The system power supply of the verification device is powered by a 20AH lithium battery. The lithium battery is independently installed in an explosion-proof box, and the input and output of a power supply enter the PLC explosion-proof box.

The utility model discloses a technical scheme's protection scope is still all belonged to above the utility model discloses the embodiment commonly used, it is not right the utility model discloses do any restriction, all according to the utility model discloses technical principle is to above implementing any modification, change and equivalent structure transform etc. of doing.

Claims (6)

1. An on-line verification device for an LNG dispenser is characterized by comprising a liquid phase verification pipeline, a gas phase verification pipeline and a vent pipeline,

wherein the emptying pipeline is used for emptying the liquid phase verification pipeline and the gas phase verification pipeline,

wherein the liquid phase verification pipeline comprises a liquid phase standard flowmeter (3) and a liquid phase outlet (22), an inlet of the liquid phase standard flowmeter (3) is connected to a liquid adding gun interface (84) of the detected gas dispenser, an outlet of the liquid phase standard flowmeter (3) is connected to the vacuum box (20),

the vacuum box (20) is connected with a flow regulating valve (89), the flow regulating valve (89) is connected to the liquid phase outlet (22),

wherein, the gas-phase verification pipeline comprises a gas-phase interface air filling gun (14) and a gas-phase standard flowmeter (42), the gas-phase interface air filling gun (14) is connected to the gas-phase standard flowmeter (42) through the vacuum box (20), the outlet of the gas-phase standard flowmeter (42) is connected back to the vacuum box (20), and the vacuum box (20) is connected to the air return port (11) of the detected air filling machine,

wherein the vent pipeline comprises a vent opening (85) which is connected to a gas-phase vent valve (86), a liquid-phase vent valve (87) and a safety valve (88), the gas-phase vent valve (86), the liquid-phase vent valve (87) and the safety valve (88) are all led out from the vacuum box (20),

the safety valve (88) is used for automatically opening for pressure relief when the working pressure of the LNG dispenser online detection device is too high.

2. The LNG dispenser online calibration device according to claim 1, wherein the vacuum tank (20) is connected with a temperature transmitter (33) and a pressure transmitter (35).

3. The LNG dispenser online calibration device according to claim 2, wherein the vacuum tank (20) is further connected with a mechanical pressure gauge (10).

4. The on-line verification apparatus for LNG dispenser of claim 3, characterized in that the vacuum tank (20) is connected to the gas phase vent valve (86) and the gas return port (11) via check valves.

5. The LNG dispenser online calibration device according to claim 4, characterized in that the LNG dispenser online calibration device is a vehicle-mounted mobile device, and the liquid phase outlet (22) is connected to a vehicle-mounted storage tank.

6. The LNG dispenser on-line calibrating device of claim 5, further comprising an ultra-low temperature heat preservation box for accommodating the liquid phase calibrating pipeline, the gas phase calibrating pipeline and the emptying pipeline, wherein the liquid phase calibrating pipeline, the gas phase calibrating pipeline and the emptying pipeline adopt stainless steel vacuum hoses.

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