RU46555U1 - DEVICE FOR FILLING FUEL VEHICLES - Google Patents

Abstract

The vehicle fueling device comprises a pressure fuel supply tank and a vehicle fuel tank, supply and bypass pipelines having flexible sections in contact with a connection associated with a fuel tank to be filled, a measuring device for determining the volume of liquid cryogenic fuel supplied, valves and temperature and pressure sensors located in the valve box. The aim of the proposed technical solution is to create a device for refueling cryogenic fuel of fuel cryogenic tanks of vehicles under pressure with the choice of a refueling algorithm for the temperature sensor installed on the bypass pipeline. In the proposed device, the valve box is made in the form of a filling column; a filter is installed on the inlet pipe for cleaning from mechanical impurities, the contacting device is made in the form of a filling gun, docked to the neck of a cryogenic fuel tank; the bypass pipe is equipped with overflow and temperature sensors; a purge gas supply pipe, for example nitrogen, is connected to the inlet of the supply pipeline through a tap, the other end of which is connected through a tap to a nozzle fixed to the filling column housing. Thanks to this embodiment of the device for refueling vehicles, a reliable assessment of the state of the fuel tank before refueling and, accordingly, the choice of refueling mode is achieved, which is more economical.

Description

Known devices for refueling vehicles with liquefied natural gas (see Overview XM-6 "Cryogenic and Vacuum Engineering. Use of liquefied natural gas in transport. M., TSINTIHIMNEFTEMASH, 1987), which are conducted both at atmospheric pressure and at increased pressure with the discharge of gas into the gas tank or receiver during drainless refueling or when pushed into the refueling tank using a pump without venting the gas phase, which do not reflect solutions to specific technical problems.

A known system for refueling a cryogenic tank with liquefied gas (see patent RU 2221965, MKI 7F 17C 6/00, 13/00, Publ. 20.01.04r, Bull. No. 2), containing a tank (tanker) with cryogenic liquefied gas, refueling and drainage pipelines connected to a bypass valve and pressure and temperature sensors. The system operates when the cryogenic product is supercooled to a charge to equilibrium temperature, for example, by evacuating and pumping vapors from a filling tank, which requires the installation of additional equipment, in particular a vacuum pump.

We also know a device for refueling cryogenic fuel of vehicles taken by us as a prototype (see EP 0779470 A1, MKI 6F 17C 9/00, publ. 06/18/97, Patentblatt 1997/25, Prior. 12/14/95,

DE 19546659) comprising a reservoir for supplying cryogenic fuel under pressure, a vehicle fuel tank, a supply pipe and a bypass pipe having flexible portions in contact with a connection associated with the fuel tank; measuring device for determining the volume of liquid cryogenic fuel, valves and temperature and pressure sensors installed in the valve box.

The disadvantages of the device include the complexity of the device, the use of double metering of liquid and gas costs and the fact that in order to create pressure in the liquid cryogenic fuel supply pipeline, two tanks are required: a low pressure storage tank and a pressure fuel supply tank, the gas cavities of which are connected a pipeline with a compressor, with which gas from the low pressure storage tank is supplied to the tank for supplying fuel under pressure.

The aim of the proposed technical solution is to create a device for refueling cryogenic fuel of fuel cryogenic tanks of vehicles under pressure with the choice of a refueling algorithm for the temperature sensor installed on the bypass pipeline.

The proposed device for refueling vehicles with liquefied natural gas (LNG), such as methane, (see Fig.1,2 and 3) consists of a tank 1 for storing and supplying fuel (LNG), a cryogenic fuel tank 2, supply 3, bypass 4 and drainage 5 pipelines. The inlet 3 and the bypass 4 pipelines have flexible sections 6 and 7 connected through tearing devices 8 and 9 with a filling hose 10 made in the form of a metal hose and a bypass hose 11 in contact with the filling nozzle 12 of the filling gun 13, which is connected to the neck 14 when refueling refueling cryogenic fuel tank 2 of the vehicle, and at the end

refueling (in the idle position) - to an identical neck 15 mounted on the housing 16 of the dispenser 17, inside which the above-mentioned pipelines 3,4,5 are mounted with fittings and sensors. (see figure 3).

The main supply pipe 3 (see FIG. 1) serves to supply LNG to the cryogenic fuel tank 2 of the vehicle (not shown in FIG. 1) and consists of a filter 18 for cleaning of mechanical impurities, a cold valve 19, a flow meter-counter 20 for liquefied gas with an electronic pointer 21 (see figure 3), placed on the housing 16 of the column 17, valves 22 and 23, for example, electro-pneumatic valves, two safety valves 24 and 25, protecting the refueling cryogenic fuel tank 2 and the main pipe fittings and 3 against overpressure. The discharge of gas from the safety valves 24 and 25 is connected by a pipe 26 to the supply to the candle or the disposal system (not shown in FIG.).

To control the temperature and pressure of the refueling gas flow, temperature sensors 27 and pressure 28 are installed on the supply pipe 3, and pressure gauges 29 and 30 are installed for visual pressure control.

A valve 23, for example, an electro-pneumatic hydraulic valve, is used to discharge vapors of liquid evaporating during cooling from the main supply pipe 3 to the drain pipe 26 through a throttle washer 31, and then to a candle or to a disposal system (not shown in Fig.).

At the bypass pipe 4, there are installed: a valve 32, a temperature sensor 33, according to which, depending on the temperature state of the fuel tank 2 being filled (cold or warm), the filling start algorithm is selected, an overflow sensor 34 controls the ingress of liquid into the pipe 4, which characterizes the end of the filling, and pressure gauge 35.

For safety reasons and for cleaning and drying the entire piping system and fittings of the filling column 17 of residual air (gas), a purge line 36 with nitrogen gas is provided before operation, connected via fittings 37 and 38 to a nitrogen cylinder (not shown in FIG. 1) through ball valve 39 to the main supply pipe 3 in front of the filter 18, and through the ball valve 40 to the nozzle 15 (inoperative) mounted on the housing 16 of the filling column 17. To control the pressure of the supplied nitrogen on the purge line 37 installed manoma mp 41.

The device operates as follows.

The filling gun 13 is attached to the neck 14 of the cryogenic fuel tank 2. The LNG from the storage tank 1, which is under pressure, enters the supply pipe 3 and the filling column 17, having been cleaned of mechanical impurities in the filter 18, the open valve 19 and the flow meter-counter 20 approaches the normally closed solenoid valve 22, which opens upon the operator’s signal to open, and then enters the inlet of the electrohydraulic valve 23 and metal sleeve 7 through a bursting device 8 and a filling hose 10 to the refueling nozzle 12 of the refueling gun 13, docked to the neck 14 of the refueling cryogenic fuel tank 2 of the vehicle ..

With the open electro-pneumatic hydraulic valve 22, the primary supply pipe 3 is initially chilled.

During the cooling process, the vapor-liquid mixture formed in the pipeline 3 is discharged through the electro-pneumatic and hydraulic valve 23 and the pipe 26 to the disposal system or to the candle (not shown in Fig.), While gas vapor from the fuel tank 2 through the bypass hose 11 through

the explosive device 9 and the flexible pipe 6 enters the bypass pipe 4, with the valve 32 open, into the drain pipe 5 and then also into the disposal system or to the candle. According to the temperature sensor 33 at the bypass pipe 4, the state of the refueling fuel tank 2 is determined, which can be “warm” or “cold”, and, accordingly, the control system algorithm is generated by its signals: filling the “warm” or filling the “cold” tank.

The cooling process ends when the temperature of the LNG in the main supply pipe 3 reaches 132K, and the pressure is 0.2 - 0.25 MPa. The signal from the temperature sensors 27 and pressure 28 is supplied to an electro-pneumatic hydraulic valve 23, which is closed, the LNG stream flows through a pipe 3 through an open valve 22, a flexible metal hose 7, a bursting device 8 and a filling hose 10 to fill the cryogenic fuel tank 2. At the same time, the LNG vapor from the fuel tank 2 of the vehicle through the bypass hose 11 of the refueling gun 13, the bursting device 9, a flexible metal hose 6 via the bypass 4 and drain 5 pipelines are fed to the disposal system or to the candle.

According to the signal from the flow meter-counter 20 or when the LNG liquid phase overflow sensor 4 appears in the bypass pipe 4 according to the readings of the overflow sensor 35, electric signals for closing are supplied to the electro-pneumatic and hydraulic valve 22 and, at the same time, electric signals for opening to the electro-pneumatic and hydraulic valve 23. The cryogenic fuel tank 2 of the vehicle is refueling.

When the pressure in the drainage pipe 5 decreases below 0.05 MPa, the electro-pneumatic and hydraulic valve 23 closes. The filling gun 13 is undocked from the neck 14 of the cryogenic fuel tank 2 and docked to the identical neck 15 on the housing 16 of the filling column 17.

If the pressure in the main supply pipe 3 is exceeded above 0.55 + 0.02 MPa, the safety valves 24 and 25 are activated, while the LNG through the pipeline 26 also enters the disposal system or the candle.

The entire refueling process is carried out automatically in accordance with the specified algorithm.

To clean and dry the entire piping system and fittings of the dispenser 17 before operating from the residual air (gas) using nozzles 37 and 38, a nitrogen gas cylinder (not shown in FIG. 1) is connected to the purge line 36, and then, depending on the need either the main supply pipe 3 with fittings is blown (filling column 17) when the necks 13 and 15 are joined in the idle position (see Fig. 1) and nitrogen is supplied through a ball valve 40. If necessary, purge and dry the fuel tank 2 by supplying nitrogen through a ball valve 39 main supply line 3 (and further as when filling), in both cases with a gas outlet in the recycling system, or a candle.

Thanks to this embodiment of the device for refueling vehicles, a reliable assessment of the state of the fuel tank before refueling and, accordingly, the choice of refueling mode, which is more economical, are achieved.

Claims (1)

A vehicle fueling device, comprising a pressure fuel supply tank and a vehicle fuel tank, supply and bypass pipelines having flexible sections in contact with a connection associated with a fuel tank to be filled, a measuring device for determining the volume of liquid cryogenic fuel supplied, valves and temperature and pressure sensors located in the valve box, characterized in that the valve box is made in the form of a filling column; a filter is installed on the inlet pipe for cleaning from mechanical impurities, the contacting device is made in the form of a filling gun, docked to the neck of a cryogenic fuel tank; the bypass pipe is equipped with overflow and temperature sensors; a purge gas supply pipe, for example nitrogen, is connected to the inlet of the supply pipeline through a tap, the other end of which is connected through a tap to a nozzle fixed to the filling column housing.