KR102173088B1 - Hydrogen mixed gas supply device for vehicle charging - Google Patents

Abstract

The present invention relates to a hydrogen mixed gas supply device for vehicle charging. This includes a liquefied gas tank for receiving liquefied gas supplied from the outside; A hydrogen tank receiving and receiving liquefied hydrogen supplied from the outside; A mixing unit connected to the liquefied gas tank and the hydrogen tank and receiving and mixing the liquefied gas and liquefied hydrogen; A plurality of mixed gas passages connected in parallel to the mixing unit and configured to receive and store the hydrogen mixed gas in a mixed state; A case body providing a plurality of isolation spaces separated from each other, an inner width case provided in each isolation space of the case body and having a gas cylinder pocket for receiving and protecting the mixed gas cylinder therein; A gas charger installed on the ground and connected to each of the mixed gas cylinders and supplying a hydrogen mixed gas to the vehicle; And a control unit for controlling the mixing unit.
In the hydrogen mixed gas supply device for vehicle charging of the present invention made as described above, since the gas cylinders for receiving the hydrogen mixed gas are accommodated in the inner width space blocked from each other, there is a risk that the mixed gas cylinder may explode even when shaking or impact is applied. There is little, and even if it explodes, it is safe because the explosive power is not transmitted to the surroundings. In addition, since uniform mixing of hydrogen gas and liquefied gas is stably maintained, a hydrogen mixed gas having the best performance can be supplied.

Description

Hydrogen mixed gas supply device for vehicle charging

The present invention relates to a supply device for supplying a hydrogen mixed gas in which liquefied gas for fuel and hydrogen gas are mixed, and more specifically, a hydrogen mixed gas that is installed at a gas charging station along the road and maintains a uniform mixed state is safely stored and It relates to a hydrogen mixed gas supply device for vehicle charging that can be supplied.

A gas charging station installed on a roadside or a vehicle base is a facility that stores and supplies fuel gas such as compressed natural gas (CNG) or liquefied petroleum gas (LPG). Buses, taxis, or vehicles using gas stop at a gas charging station to refill gas.

As is known, fuel gas is relatively inexpensive compared to gasoline or diesel, and is eco-friendly due to low carbon emissions, so existing diesel buses are gradually being replaced with compressed natural gas buses, and gas charging stations are also increasing accordingly.

However, the gas stored in the gas charging station is under high pressure, and it is not located in the downtown area or downtown where there are many people because it has the risk of a large explosion or gas leak. A safe technology is needed to completely prevent an explosion or gas leak accident at a gas charging station.

On the other hand, in recent years, a hydrogen gas mixture in which hydrogen gas is mixed with natural gas or liquefied petroleum gas has been developed. Hydrogen mixed gas is a mixture of hydrogen gas with liquefied petroleum gas (LPG) or liquefied natural gas (LNG) in a ratio of about 9:1, and has characteristics such as a fast flame speed and a wide flammable range. Improves.

However, the performance of the hydrogen gas mixture can be realized only when the liquefied gas (LNG or LPG) and hydrogen are uniformly mixed. For example, if liquefied gas and hydrogen gas are not evenly mixed, for example, if they are separated by a difference in weight, the size of the flame is not constant and combustion efficiency is also reduced.

In order to solve this problem, Korean Patent Publication No. 10-0729277 (gas mixer) has been proposed. In the above publication, a chamber having a mixing space, first and second injection pipes installed in the mixing space and guiding hydrogen gas and liquefied gas into the mixing space, and screw rods installed at the outlet side of the first and second injection pipes, etc. Is composed. The screw rod plays a role in inducing the injection of hydrogen gas and liquefied gas to cause a whirl. The reason for applying screw rod is to induce even mixing of hydrogen gas and liquefied gas.

However, in the conventional gas mixer described above, even if a screw rod is applied, the mixing efficiency is not very high. The reason is that the kinetic energy of the fluid injected in the form of a tornado collides with the splitting steel plate and rapidly weakens.

Domestic Patent Publication No. 10-0729277 (Gas Mixer) Domestic Patent Publication No. 10-1351921 (Remote control and monitoring device to prevent corrosion of gas storage tanks at gas filling stations, oil tanks at gas stations, and metal pipes)

The present invention was created to solve the above problems, and there is little risk of explosion of the mixed gas cylinder even when shaking or impact is applied, and even if it explodes, the hydrogen mixed gas supply device for safe vehicle charging is not transmitted to the surroundings. There is a purpose to provide.

In addition, since uniform mixing of hydrogen gas and liquefied gas is stably maintained, another object is to provide a hydrogen mixed gas supply device for vehicle charging capable of supplying a hydrogen mixed gas having the best performance.

A hydrogen mixed gas supply device for vehicle charging as a means of solving the problems for achieving the above object comprises: a liquefied gas tank for receiving liquefied gas supplied from the outside; A hydrogen tank receiving and receiving liquefied hydrogen supplied from the outside; A mixing unit connected to the liquefied gas tank and the hydrogen tank and receiving and mixing the liquefied gas and liquefied hydrogen; A plurality of mixed gas passages connected in parallel to the mixing unit and configured to receive and store the hydrogen mixed gas in a mixed state; A case body providing a plurality of isolation spaces separated from each other, an inner width case provided in each isolation space of the case body and having a gas cylinder pocket for receiving and protecting the mixed gas cylinder therein; A gas charger installed on the ground and connected to each of the mixed gas cylinders and supplying a hydrogen mixed gas to the vehicle; And a control unit for controlling the mixing unit.

In addition, the mixing unit; The housing and the sealed chamber are installed to be elevating inside the housing and connected to the liquefied gas tank and the hydrogen gas tank through the gas supply hose and the hydrogen supply hose, and the sealed chamber repeatedly lifts and descends within a certain stroke distance. It is installed inside the sealed chamber, a lifting part that guides the lifting movement of the sealed chamber, and is supported on the inner wall surface of the sealed chamber by a plurality of elastic ropes, and liquefied gas and hydrogen are transported in the thickness direction. The mesh body that can pass through the mesh body is fixed at the center of the mesh body and is raised and lowered by the inertial force when the airtight chamber is moved up and down, and the inertial weight that allows the liquefied gas and hydrogen to be mixed by making the mesh body sway up and down within the stretch range. It includes a mixing mesh with.

In addition, the lifting unit; A cam installed to be rotatable in the lower part of the sealed chamber, a cam driving motor that rotates the cam to cause the cam to lift the sealed chamber, and a spring provided on the upper part of the sealed chamber, and pressurizing the sealed chamber downward elastically. Have.

In addition, inside the case body, a plurality of vertical barrier walls intersecting each other in a manner orthogonal to each other are installed to form the isolation space, and wrinkles that add elastic deformability to the barrier walls Wealth is formed.

In addition, the gas cylinder pocket; An inner shell receiving and protecting the mixed gas cylinder, an outer shell surrounding the inner shell and having a nitrogen filling space filled with nitrogen, and fixed between the inner shell and the outer shell, and the inner shell And a gap maintaining member for maintaining a gap between the shell and the outer shell.

In the hydrogen mixed gas supply device for vehicle charging of the present invention made as described above, since the gas cylinders for receiving the hydrogen mixed gas are accommodated in the inner width space blocked from each other, there is a risk that the mixed gas cylinder may explode even when shaking or impact is applied. There is little, and even if it explodes, it is safe because the explosive power is not transmitted to the surroundings.

In addition, since uniform mixing of hydrogen gas and liquefied gas is stably maintained, a hydrogen mixed gas having the best performance can be supplied.

1 is a view showing the overall structure of a hydrogen mixed gas supply device for vehicle charging according to an embodiment of the present invention.
2 is a cross-sectional view for explaining the configuration of the mixing unit of FIG. 1.
3 is a cutaway perspective view showing the internal structure of the lifting unit shown in FIG. 2.
4 is a view for explaining the operation of the lifting unit shown in FIG.
5 is a plan view of the inner width case and the gas cylinder pocket shown in FIG. 1.
6 is a side cross-sectional view separately showing the gas cylinder pocket of FIG. 5.

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

Basically, the hydrogen mixed gas supply device of the present invention makes a hydrogen mixed gas by mixing liquefied gas and liquefied hydrogen, and uses the produced hydrogen mixed gas in the same manner as in which the vehicle is filled with gas at a normal gas charging station. It has a configuration to supply to. The supply device of the present invention may be additionally installed and operated in an existing gas charging station or may be newly installed and operated.

1 is a view showing the overall structure of a hydrogen mixed gas supply device for vehicle charging according to an embodiment of the present invention.

As shown, the vehicle charging hydrogen mixed gas supply device 20 according to the present embodiment includes a hydrogen tank 21, a liquefied gas tank 23, a mixing unit 30, a plurality of mixed gas cylinders 67, It includes an inner width case 60, a gas charger 12, and a control unit 40.

First, the hydrogen tank 21 is installed buried under the ground (G), and receives liquefied hydrogen supplied from the outside through the hydrogen injection unit 15 and temporarily stores it. In some cases, the hydrogen tank 21 may be installed on the ground. In addition, the volume of the hydrogen tank 21 may be changed as needed.

The liquefied gas tank 23 is installed on the side of the hydrogen tank 21 and receives and stores the liquefied gas supplied through the gas injection unit 17 from the outside. The liquefied gas includes all gases that can be used for fuel such as LNG, LPG, and CNG.

The mixing unit 30 serves to receive hydrogen from the hydrogen tank 21 and the liquefied gas from the liquefied gas tank 23 and mix them therein. The supply hoses 21a and 23a connecting the hydrogen tank 21 and the mixing unit 30 and the liquefied gas tank 23 and the mixing unit 30 have flexible properties. In particular, the ratio of hydrogen and liquefied gas supplied to the mixing unit 30 is about 1:9 to 1:10. Liquefied gas is mixed with hydrogen 1 in a ratio of 9 to 10. However, the mixing ratio described above can be changed as much as necessary.

The structure and operating principle of the mixing unit 30 will be described first through FIGS. 2 to 4.

As shown in Figs. 2 and 3, the mixing unit 30 includes a box-shaped housing 31, a sealed chamber 37, an elevating unit, an elevating guider 32, and a mixing mesh 38.

The housing 31, for example, takes the form of a box and provides an internal space, and accommodates and protects the sealed chamber 37 and the elevating portion. The supply hoses 21a and 23a are connected to the sealed chamber 37 through one side wall of the housing 31. In addition, the mixed gas delivery pipe 30a passes through the other side wall of the housing 31. The mixed gas transfer pipe (30a) has a flexible property and transfers the mixed gas (Z) inside the sealed chamber (37) to the mixed gas cylinder (67).

The sealed chamber 37 is a mixing container installed in the housing 31 so as to be elevated and lowered by the action of the elevating portion, and liquefied gas and hydrogen are shaken up and down to mix.

The elevating guider 32 guides the elevating movement of the sealed chamber 37, thereby preventing the elevating guider 32 from moving in the lateral direction while elevating. In other words, the lifting guide is constrained to move in the vertical direction only.

The elevating guide 32 includes a fixing ring 32a fixed to the center of the ceiling surface of the housing 31 and extending downward, and an elevating ring 32b mounted on the upper portion of the sealed chamber 37. The lifting ring 32b is located vertically below the fixed ring 32a.

The fixed ring (32a) and the lifting ring (32b) take the shape of a ring having a constant diameter, and the lifting ring (32b) is inserted into the inner side of the fixed ring (32a) to allow a sliding motion. The lifting ring (32b) is in contact with the inner circumferential surface of the fixing ring (32a) and is provided with a supporting force from the fixing ring (32a), it moves only in the vertical direction, but cannot move in the lateral direction.

The elevating unit includes a cam 35, a cam driving motor 34, and a spring 33. The cam 35 is a mechanical element installed to be rotatable under the cam receiver 36 fixed to the bottom of the sealed chamber 37, and rotates by receiving a rotational force from the cam driving motor 34 to raise and lower the sealed chamber 37 Exercise.

The spring 33 is installed inside the lifting guide 32 and serves to pressurize the sealing chamber 37 downward elastically. By the action of the spring 33, the cam receiver 36 and the cam 35 come into close contact, and the sealed chamber 37, which has reached the top dead center, descends without delay and elastically.

On the other hand, the mixing mesh 38 is installed inside the sealed chamber 37 and slumps up and down following the lifting motion of the sealed chamber 37 to promote mixing of liquefied gas and hydrogen. The number of applications of the mixing mesh 38 varies according to need.

The mixing mesh 38 is a mesh body 38a, which takes the shape of a square and is horizontally arranged, and is fixed to the vertex of the mesh body 38a and is fixed to the inner wall surface of the sealed chamber 37. , It is provided with an inertial weight (38c), fixed block (38d) fixed to the center of the mesh body (38a).

The mesh body 38a is a flexible sheet member and mixes liquefied gas and hydrogen while passing through it in the thickness direction. The mesh body 38a can be made of a nylon material.

The elastic rope 38b is a rubber band having elasticity, and the other end thereof is fixed to the inner wall surface of the sealing chamber 37 through a fixing block 38d. The elastic rope 38b pulls the mesh body 38a taut so that it does not stretch downward.

The inertial weight 38c is a member made of synthetic resin or rubber, and is fixed to the center of the mesh body 38a to apply an inertial force to the mesh body 38a. In other words, it moves up and down in response to the lifting motion of the sealed chamber, and provides a force that causes the mesh body to sway up and down within the expansion and contraction range.

4A and 4B are views for explaining the operation of the lifting unit and the mixing weight 38.

As mentioned above, when the cam 35 is rotated, the sealing chamber 37 reciprocates between the top dead center and the bottom dead center by the action of the elastic force and gravity of the cam 74 and the spring 33. At this time, the mixed gas and the inertial weight 38c in the sealed chamber 37 are also raised and lowered.

That is, the inertia weight 38c further rises in the direction of the arrow u by the inertial force at the moment when the sealed chamber 37 reaches the top dead center and stops. At this time, the elastic rope 38b of the four corners is increased, and the mesh body 38a is bent upward as shown in FIG. 4A.

Similarly, the moment the sealing chamber 37 reaches the bottom dead center and stops, the inertia weight 38c further descends in the direction of arrow d by the inertial force. Accordingly, the elastic rope 38b at the four corners descends and the mesh body 38a is bent downward as shown in FIG. 4A.

Eventually, while the cam continues to rotate, by the inertial motion of the inertial weight 38c and the stretching and contracting action of the elastic rope 38b, the mesh body 38a repeats the vertical swinging motion. Accordingly, hydrogen and liquefied gas filled in the sealed chamber 37 are evenly mixed while passing through the mesh body 38a in the thickness direction.

The mixed gas Z mixed in the sealed chamber 37 is transferred to the storage unit 50 through the mixed gas transfer pipe 30a, as shown in FIG. 1.

The storage unit 50 includes a plurality of mixed gas cylinders 67, an inner width case 60, and a gas cylinder pocket (65 in FIG. 5). The inner width case 60 and the gas cylinder pocket 65 support the mixed gas cylinder 67 vertically in a space isolated from each other, and have the configurations shown in FIGS. 6 and 6.

5 is a plan view of the inner width case 60 and the gas cylinder pocket 65 shown in FIG. 1, and FIG. 6 is a side cross-sectional view separately showing the gas cylinder pocket of FIG. 5.

As shown, the inner width case 60 is composed of a case body 61 taking the form of a rectangular frame, and a blocking wall 63 built into the case body 61. The blocking wall 63 is a plate-shaped member that divides the inner region of the case body 61 into a plurality of isolation space portions 61a and is fixed in a manner that is orthogonal to each other. That is, a plurality of blocking walls 63 are arranged to be orthogonal to each other. Each of the barrier walls 63 may be welded to each other. As long as a plurality of isolation spaces 61a can be provided inside the case body 61, the structure of the blocking wall 63 can be changed as much as possible. The blocking wall 63 is a wall extending in the vertical direction and has the same cross-sectional shape in the vertical direction.

In addition, each of the blocking walls 63 has a serrated corrugated corrugated portion 63a and a flat plate portion 63b. The corrugated portion 63a provides elastic deformability to the blocking wall 63. For example, when an impact comes in from the outside, it spreads elastically and attenuates the impact. For example, by absorbing the shock generated when the mixed gas cylinder 67 explodes, the impact is greatly reduced from being transmitted to the mixed gas cylinder 67 in the neighboring isolation space 61a.

Reference numeral 64 denotes a side supporter. The side supporter 64 is a support member that supports the gas cylinder pocket 65 while being fixed to the flat plate portion 63b. The side supporter 64 can be made of hard rubber, acetal, or engineering plastic. The gas cylinder pocket 65 is supported by the side supporter 64 in a state accommodated in the isolation space 61a and does not move back and forth, left and right.

The gas cylinder pocket 65 is made of steel and provides an inner width 65d for accommodating and protecting the mixed gas cylinder 67 therein. The inner peripheral surface of the inner width space (65d) is in close contact with the outer peripheral surface of the mixed gas cylinder (67). The gas cylinder pocket 65 accommodates the mixed gas cylinder 67, and serves to primarily absorb the impact when the mixed gas cylinder is exploded and to remove the flame.

The gas cylinder pocket 65 is made of an inner shell 65a, an outer shell 65b, and a bending bracket 65c. The gas cylinder pocket 65 extends in the vertical direction and has the same cross-sectional shape in the extending direction.

The inner shell 65a is a cylindrical member providing an inner width space 65d. If necessary, a synthetic resin sheet for preventing corrosion may be laminated on the inner circumferential surface of the inner shell 65a.

The outer shell 65b is a cylindrical member that surrounds and protects the inner shell 65a. In particular, the outer circumferential surface of the inner shell 65a and the inner circumferential surface of the outer shell 65b are spaced apart at regular intervals and have a nitrogen filling space 65e therebetween. The nitrogen filling space 65e is an enclosed space filled with nitrogen gas.

The nitrogen gas is ejected to the outside at the moment the gas cylinder pocket 65 is torn due to the explosion of the gas cylinder 67, and serves to immediately extinguish the flame generated during the gas explosion. Initial evolution is possible by filling the gas cylinder pocket 65 with nitrogen gas.

The bending bracket 65c is a member that maintains a gap between the inner shell 65a and the outer shell 65b.

In addition, a residual amount detection sensor 68 is provided in each mixed gas cylinder 67. The residual amount detection sensor 68 detects the residual amount of the mixed gas contained in the mixed gas cylinder 67 and transmits it to the control unit 40. The sensing method of the residual amount detection sensor 68 may be various, for example, a method of sensing the weight of the mixed gas under the mixed gas cylinder 67 may be employed. In other words, when only the weight of the mixed gas cylinder 67 is sensed, it is determined that there is no residual amount of the mixed gas.

Meanwhile, the mixing unit 30 and each of the mixed gas cylinders 67 are connected by a mixed gas transfer pipe 30a. The mixed gas cylinder 67 is connected in parallel to the mixing unit 30. The mixed gas transfer pipe (30a) is branched while extending from the mixing unit (30) toward the storage unit (50) to be connected to each mixed gas cylinder (67). Reference numeral 30e denotes a pump for pumping mixed gas.

In addition, a first individual valve 30b is installed in the mixed gas delivery pipe 30a after branching. The first individual valve 30b is opened and closed by the control unit 40. This means that the mixed gas can be supplied only to the desired mixed gas cylinder 67 among the plurality of mixed gas cylinders 67. That is, through the residual amount detection sensor 68, it is possible to immediately fill the mixed gas into the mixed gas cylinder 67, which is determined to be empty (empty). In this way, by applying the first individual valve 30b, the residual amount detection sensor 68 and the control unit 40, all the mixed gas cylinders 67 are kept filled with an appropriate amount of mixed gas.

Meanwhile, a supply pipeline 66 is disposed between each of the mixed gas cylinders 67 and the gas charger 12. The supply pipeline 66 is a pipe that guides the mixed gas inside the mixed gas cylinder 67 to the gas charger 12, and is connected to the gas charger 12 after extending from each mixed gas cylinder 67 and being merged into one.

In addition, a second individual valve 67a and a metering pump 69 are sequentially installed in a portion of the supply pipeline 55 before being combined, that is, a portion extending vertically above each mixed gas cylinder 67 in the drawing. . Opening and closing of the second individual valve 67a is also performed by the control unit 40. The control unit 40 is capable of selectively opening or blocking a required second individual valve 67a among the plurality of second individual valves 67a.

The metering pump 69 serves to pump the mixed gas that has passed through the second individual valve 67a to the gas charger 12 side. The pumping amount of the metering pump 69 is determined by the gas charger 12. In other words, when the gas filling source inputs flow rate information corresponding to the amount desired by the customer, it pumps the flow rate as input.

Reference numeral 71 is a circuit breaker. The circuit breaker 71 operates when the mixed gas leaks and immediately stops the supply of the mixed gas.

The gas charger 12 is the same equipment installed in a general gas charging station 10. For example, when the vehicle stops next to the gas charger 12, the charging source opens the fuel inlet of the vehicle and injects the hydrogen mixed gas in a fixed state by fitting the injection nozzle 14.

In the above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill in the art within the scope of the technical idea of the present invention.

10: charging station 12: gas charger 14: injection nozzle
15: hydrogen injection unit 17: gas injection unit 20: supply device
21: hydrogen tank 21a: supply hose 23: liquefied gas tank
23a: supply hose 30: mixing part 30a: mixed gas transfer pipe
30b: first individual valve 30e: pump 31: housing
32: elevating guide 32a: fixing ring 32b: elevating ring
33: spring 34: cam driving motor 35: cam
36: cam receiver 37: sealed chamber 38: mixing mesh
38a: mesh body 38b: elastic rope 38c: inertia weight
38d: fixed block 40: control unit 50: storage unit
60: inner width case 61: case body 61a: isolation space
63: blocking wall 63a: wrinkle portion 63b: flat plate portion
64: side supporter 65: gas cylinder pocket 65a: inner shell
65b: outer shell 65c: bending bracket 65d: inner width
65e: nitrogen filling space 66: supply pipeline 67: mixed gas cylinder
67a: second individual valve 68: residual amount detection sensor 69: metering pump
71: circuit breaker

Claims (5)

delete A liquefied gas tank for receiving liquefied gas supplied from the outside; A hydrogen tank receiving and receiving liquefied hydrogen supplied from the outside; A mixing unit connected to the liquefied gas tank and the hydrogen tank and receiving and mixing the liquefied gas and liquefied hydrogen; A plurality of mixed gas passages connected in parallel to the mixing unit and configured to receive and store the hydrogen mixed gas in a mixed state; A case body providing a plurality of isolation spaces separated from each other, an inner width case provided in each isolation space of the case body and having a gas cylinder pocket for receiving and protecting the mixed gas cylinder therein; A gas charger installed on the ground and connected to each of the mixed gas cylinders and supplying a hydrogen mixed gas to the vehicle; And a control unit for controlling the mixing unit,
The mixing unit includes a housing, an airtight chamber connected to the liquefied gas tank and the hydrogen gas tank through a gas supply hose and a hydrogen supply hose, and the airtight chamber within a predetermined stroke distance. A lifting part for repeatedly lifting and descending, an lifting guide for guiding the lifting motion of the sealed chamber, and installed inside the sealed chamber, supported on the inner wall of the sealed chamber by a plurality of elastic ropes, and liquefied gas and hydrogen The mesh body that can pass in the thickness direction, is fixed at the center of the mesh body, and moves up and down by inertial force when the airtight chamber moves up and down, and the liquefied gas and hydrogen are mixed by making the mesh body sway up and down within the stretch range Hydrogen mixed gas supply device for vehicle charging that includes a mixing mesh having an inertial weight. The method of claim 2,
The elevating part;
A cam installed to be rotatable in the lower part of the sealed chamber,
A cam driving motor for causing the cam to lift the sealed chamber by rotating the cam,
A hydrogen mixed gas supply device for vehicle charging, which is provided on the upper portion of the sealed chamber and has a spring for elastically pressing the sealed chamber downward. The method of claim 2,
Inside the case body, a plurality of vertical barrier walls intersecting each other in a manner orthogonal to each other are installed to form the isolation space,
A hydrogen mixed gas supply device for vehicle charging in which each barrier wall has a corrugated portion for adding elastic deformability to the barrier wall. The method of claim 4,
The gas cylinder pocket;
An inner shell accommodating and protecting the mixed gas cylinder,
An outer shell surrounding the inner shell and having a nitrogen filling space filled with nitrogen between the inner shell and the inner shell,
A hydrogen mixed gas supply device for charging a vehicle, which is fixed between the inner shell and the outer shell, and includes a gap maintaining member for maintaining a gap between the inner shell and the outer shell.

Images