CN211289555U

CN211289555U - Environment-friendly energy-saving liquefied natural gas cylinder

Info

Publication number: CN211289555U
Application number: CN201922107527.5U
Authority: CN
Inventors: 刘高伦; 吴德平; 罗宇; 刘多刚; 赵海
Original assignee: China Natural Gas Guangyuan Co ltd
Current assignee: China Natural Gas Guangyuan Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-08-18
Anticipated expiration: 2029-11-29

Abstract

The utility model provides an environment-friendly energy-saving liquefied natural gas bottle, which comprises a bottle body, a buffer tank, a liquid inlet pipeline, a liquid outlet pipeline and an exhaust pipeline; a liquid reserving groove is formed in the bottom in the bottle body, and the pipe opening of the liquid outlet pipeline is positioned at the bottom of the bottle body and outside the liquid reserving groove; the buffer tank is arranged at one end part in the bottle body, a buffer pipeline communicating the inner cavity of the bottle body and the inner cavity of the buffer tank is arranged at the lower side of the buffer tank, and an emptying port is arranged on the side wall of the buffer pipeline and is positioned at the bottom part, close to the buffer tank, in the buffer tank; the exhaust pipeline is provided with a first branch and a second branch, the first branch is connected with the liquid outlet pipeline, and a first pressure regulating valve is arranged on the first branch; and a second pressure regulating valve is arranged on the second branch, and the second branch is used for connecting an air return gun of the gas station. The liquefied natural gas cylinder can avoid the influence on filling caused by the complete use of liquid in the cylinder; and the influence of flash gas on the pressure in the cylinder can be effectively discharged or slowed down, the normal operation of the liquefied natural gas cylinder is ensured, the loss of natural gas is reduced, and the energy is saved.

Description

Environment-friendly energy-saving liquefied natural gas cylinder

Technical Field

The utility model relates to a vehicular liquefied natural gas bottle technical field especially relates to an energy-conserving liquefied natural gas bottle of environmental protection.

Background

The filling of the liquefied natural gas cylinder is divided into two conditions, one is conventional filling, which means a normally used gas cylinder, and when the filling is carried out, an inner container of the gas cylinder is in a low-temperature state and has a part of liquid; and secondly, hot cylinder filling refers to filling of the liquefied natural gas cylinder which is filled with LNG for the first time and stops working for more than two weeks. When filling a "hot bottle", the bottle liner needs to be cooled, which consumes a long time and wastes LNG. Therefore, the gas cylinder in use should ensure that the liquefied natural gas in the gas cylinder is not used up as much as possible, certain residual gas is reserved, the gas cylinder is ensured to be in a cold state and not to be converted into a 'hot cylinder', and the gas cylinder can be filled conventionally when being filled, so that the time and the energy are saved. When the existing liquefied natural gas bottle is used, the residual liquid in the bottle is usually determined according to the reading of a sensor connected with a liquid level meter, the fuel quantity which needs to be reserved when the gas bottle is in a cold state is ensured to be lower, the gas bottle is in the lower reading limit of the liquid level meter, and the liquid level information at the moment is difficult to accurately monitor, so that the liquefied natural gas in the gas bottle is used up.

In addition, liquefied natural gas all forms flash gas (BOG) easily in filling, use and storage process, causes the gas cylinder internal pressure to increase, and the flash gas that traditional gas cylinder produced discharges through the relief valve, and this kind of discharge pressure release mode exists natural gas extravagant, environmental pollution and potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an environment-friendly and energy-saving liquefied natural gas bottle, which is provided with a liquid reserving groove and can avoid the influence on filling caused by the complete use of liquid in the bottle; and this liquefied natural gas cylinder establishes buffer tank, first branch road, second branch road etc. can effectively discharge or slow down the influence of flash gas to the bottle internal pressure, guarantees liquefied natural gas cylinder normal operating, and reduces the natural gas loss, the energy saving.

In order to achieve the above object, the utility model adopts the following technical scheme:

an environment-friendly and energy-saving liquefied natural gas bottle comprises a bottle body, a buffer tank, a liquid inlet pipeline, a liquid outlet pipeline and an exhaust pipeline, wherein a one-way valve and a first safety valve are arranged on the liquid inlet pipeline, and a pressure gauge, a second safety valve and a discharge valve are sequentially arranged on the exhaust pipeline from the bottle body to the outside; the buffer tank is arranged at one end part in the bottle body, a buffer pipeline communicated with the inner cavity of the bottle body and the inner cavity of the buffer tank is arranged at the lower side of the buffer tank, and an emptying port is arranged on the side wall of the buffer pipeline and is positioned at the bottom part, close to the buffer tank, in the buffer tank; the exhaust pipeline is provided with a first branch and a second branch, the first branch is connected with the liquid outlet pipeline, and the first branch is provided with a first pressure regulating valve; and a second pressure regulating valve is arranged on the second branch, and the second branch is used for connecting an air return gun of the gas station.

Furthermore, the volume of the liquid retention tank is 0.5% -1.0% of the volume of the bottle body.

Furthermore, the lower end of the buffer pipeline is close to the bottom of the bottle body, and the upper end of the buffer pipeline is close to the top of the buffer tank.

Further, first branch road and second branch road all locate on the exhaust duct between discharge valve and the bottle.

Furthermore, a filter valve, a liquid valve, a vaporizer and a pressure reducing valve are sequentially arranged on the liquid outlet pipeline from the bottle body to the outside, and the first branch is connected to the liquid outlet pipeline between the bottle body and the filter valve.

Further, liquid inlet pipe, liquid outlet pipe and exhaust duct all are located the another tip of bottle that sets up the buffer tank.

Further, a liquid level meter is further arranged in the bottle body and connected with a display controller.

Further, the bottle is double-deck steel construction, including inner bag and shell, the outer winding of inner bag has the insulating layer, be the vacuum between inner bag and the shell.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a liquefied natural gas bottle, the cistern is stayed to bottom in the bottle, and the liquid outlet pipe mouth of pipe is located outside staying the cistern, can guarantee in the bottle that liquefied natural gas is not used up completely, stays in the cistern and is detained liquefied natural gas and make and remain the cold attitude in the liquefied natural gas bottle throughout and leave certain liquid, can adopt conventional mode to fill the dress when the bottle fills the dress, needn't cool off, and it is fast to fill the dress, avoids too much LNG's gasification and loss.

2. The utility model discloses an internal buffer tank that is equipped with of liquefied natural gas bottle, when the bottle fills the dress liquid level when high on the left and right sides, the space that receives BOG in the bottle is not enough, and liquid is impressed in the buffer tank through pressure, increases the space that holds BOG in the bottle, reduces bottle internal pressure, and when bottle internal pressure reduces or the liquid level reduces, liquid in the buffer tank returns the bottle through the evacuation mouth again in, effectively delays bottle internal pressure, and avoids the natural gas emission loss. When the liquefied natural gas in the bottle body is heated and vaporized for use, if the BOG in the bottle body is too much and the pressure is high, the BOG can be discharged into the liquid outlet pipeline through the first branch on the exhaust pipeline and is utilized after being heated, the use efficiency is improved, and the discharge loss is reduced. When liquid is filled, the BOG in the bottle body is too much, the pressure is too large, and the BOG can be led back to the gas station through the second branch on the exhaust pipeline, so that the BOG discharge loss is avoided.

3. The utility model discloses well first relief valve and second relief valve are BOG bleeder valve, and when the bottle internal pressure was too high, can not effectively be alleviated, utilized or retrieve, can discharge the pressure release through first relief valve and/or second relief valve, guarantee the security of liquefied natural gas cylinder's use, avoid the explosion accident.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the part a of the present invention.

Fig. 3 is a schematic structural view of the middle bottle body of the present invention.

Reference numerals:

1: a bottle body; 11: an inner container; 12: a housing; 13: a thermal insulation layer; 14: a liquid retention tank; 15: a liquid level meter; 151: a display controller; 2: a buffer tank; 21: a buffer pipe; 211: emptying the air; 3: a liquid inlet pipeline; 31: a one-way valve; 32: a first safety valve; 4: a liquid outlet pipeline; 41: a filter valve; 42: a liquid valve; 43: a vaporizer; 44: a pressure reducing valve; 5: an exhaust duct; 51: a pressure gauge; 52: a second relief valve; 53: a discharge valve; 6: a first branch; 61: a first pressure regulating valve; 7: a second branch circuit; 71: a second pressure regulating valve.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the product of the present invention is usually placed when in use, or the position or positional relationship that a person skilled in the art usually understands, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the embodiment of the utility model provides an energy-conserving liquefied natural gas cylinder of environmental protection, this liquefied natural gas cylinder include bottle 1, buffer tank 2, stay cistern 14, inlet line 3, liquid outlet pipe way and exhaust duct 5 etc..

The pipe orifice of the liquid inlet pipeline 3 extending into the bottle body 1 is positioned at the upper part of the bottle body 1, and the liquefied natural gas is filled from the top; the part of the liquid inlet pipeline 3 outside the bottle body 1 is provided with a one-way valve 31 and a first safety valve 32, and the first safety valve 32 is positioned between the one-way valve 31 and the bottle body 1; when filling natural gas, the liquid inlet pipeline 3 is connected with the gas filling gun.

The pipe orifice of the exhaust pipe 5 extending into the bottle body 1 is also positioned at the upper part in the bottle body 1 and is used for discharging flash vapor (BOG) generated by the liquefied natural gas. The part of the exhaust pipe 5 located outside the flask body 1 is provided with a pressure gauge 51, a second safety valve 52 and a discharge valve 53, and the pressure gauge 51, the second safety valve 52 and the discharge valve 53 are arranged in this order from the flask body 1 to the outside. The second safety valve 52 has a higher pressure set point than the first safety valve 32, i.e. the opening pressure of the second safety valve 52 is higher than the first safety valve 32, and in case of overpressure the first safety valve 32 is opened first, and in case of failure or blockage of the first safety valve 32 the second safety valve 52 is activated.

The liquid outlet pipe 4 extends into the mouth of the bottle body 1 and is positioned at the bottom of the bottle body 1, and liquefied natural gas is discharged and utilized from the bottom. The liquid outlet pipe 4 is located on the outside of the bottle body 1, and is provided with a filter valve 41, a liquid valve 42, a vaporizer 43 and a pressure reducing valve 44 in sequence from the bottle body 1 to the outside. The liquefied natural gas enters the natural gas utilization equipment after being filtered, heated and vaporized and pressure-regulated by the liquid outlet pipeline 4, the temperature of the gas required by the equipment is reached, and the pressure and the flow are stable over time.

The exhaust duct 5 is provided with a first branch 6 and a second branch 7. Wherein, one end of the first branch 6 is connected with the exhaust pipeline 5, and the other end is connected with the liquid outlet pipeline 4; the connection of the first branch 6 and the exhaust pipe 5 is located between the discharge valve 53 and the gas cylinder 1; the joint of the first branch 6 and the liquid outlet pipe 4 is located between the filter valve 41 and the bottle body 1, and the BOG gas is filtered by the filter valve 41 after entering the liquid outlet pipe 4. The first branch 6 is provided with a first regulating valve 61 for regulating the opening and closing of the first branch 6 and the flow rate. The junction of the second branch 7 and the exhaust pipeline 5 is also positioned between the discharge valve 53 and the gas cylinder 1, a second pressure regulating valve 71 is arranged on the second branch 7, and the second pressure regulating valve 71 controls the opening and closing of the second branch 7. Second branch road 7 is used for connecting the gas return rifle of gas station, uses when carrying out filling of liquefied natural gas, retrieves the flash gas that produces in the bottle 1, reduces the loss of natural gas outward discharge, and can once only accomplish and fill dress, improves and fills dress efficiency.

As shown in fig. 3, the bottle body 1 is of a double-layer steel structure and comprises an inner container 11 and an outer shell 12, wherein a plurality of layers of heat preservation and insulation materials are wound outside the inner container 11 to form a heat insulation layer 13; a sealed space is formed between the inner container 11 and the outer shell 12, and the vacuum pumping device is vacuumized and has the functions of heat preservation and heat insulation. A liquid retaining groove 14 and a buffer tank 2 are arranged in the bottle body 1, the liquid retaining groove 14 is arranged at the bottom of the bottle body 1 and is fixedly connected with the bottom, and the upper side of the liquid retaining groove 14 is opened and can be filled with liquid; the pipe orifice of the liquid outlet pipe 4 in the bottle body 1 is positioned outside the liquid retention tank 14, and when the liquefied natural gas is discharged for use through the liquid outlet pipe 4, the liquid in the liquid retention tank 14 cannot be discharged, so that the liquid in the bottle body 1 cannot be completely used up. The volume of the liquid retention tank 14 is preferably 0.5% -1.0% of the volume of the bottle body 1, so that after the liquefied natural gas is used, at least 0.5% -1.0% of liquid is left in the bottle body 1, the cold state of the inner container of the bottle body 1 can be kept, the bottle body 1 can be filled in a conventional mode, cooling treatment is not needed, and filling time and energy are saved. As shown in fig. 1 and 2, the buffer tank 2 is arranged at one end part in the bottle body 1, and a buffer pipeline 21 for communicating the inner cavity of the bottle body 1 and the inner cavity of the buffer tank 2 is arranged at the lower side of the buffer tank 2; the side wall of the buffer pipeline 21 is provided with a drain 211, the drain 211 is located in the buffer tube 2 and near the bottom of the buffer tank 2, that is, the drain 211 is located on the bottom wall of the buffer tube 2 and near the bottom wall, and is used for discharging the liquid in the buffer tank 2. Preferably, the lower end of the buffer pipeline 21 is close to the bottom of the bottle body 1, and the upper end of the buffer pipeline is close to the top of the buffer tank 2, when the pressure in the bottle body 1 is higher than that in the buffer tank 2, liquid enters the buffer tank 2 through the buffer pipeline 21, and the function of reducing the pressure in the bottle body 1 is achieved; when the pressure in the bottle body 1 is reduced and is lower than the pressure in the buffer tank 2, the liquid in the buffer tank 2 enters the bottle body 1.

The embodiment of the utility model provides an in, inlet channel 3, outlet channel 4 and flowing back pipeline 5 are located same tip of bottle 1, and are located another tip of bottle 1 that sets up buffer tube 2. Preferably, the end parts of the bottle body 1 provided with the liquid inlet pipeline 3, the liquid outlet pipeline 4 and the exhaust pipeline 5 are provided with protective rings to protect pipelines, valves and the like.

Furthermore, a liquid level meter 15 is arranged in the bottle body 1, and the liquid level meter 15 is connected with a display controller 151. The level gauge 15 is the capacitanc level gauge, and level gauge 15 installs in bottle 1, converts the capacitance signal of liquid level information into voltage signal, transmits display controller 151, and display controller 151 shows liquid level information and sends control signal, and when the liquid level was higher than bottle 1 design liquid loading volume, display controller 151 sent alarm signal. Preferably, the display controller 151 is provided on a guard ring at the end of the bottle body 1.

Claims

1. The environment-friendly and energy-saving liquefied natural gas bottle comprises a bottle body (1), a buffer tank (2), a liquid inlet pipeline (3), a liquid outlet pipeline (4) and an exhaust pipeline (5), wherein a one-way valve (31) and a first safety valve (32) are arranged on the liquid inlet pipeline (3), a pressure gauge (51), a second safety valve (52) and a discharge valve (53) are sequentially arranged on the exhaust pipeline (5) from the bottle body (1) to the outside, and the liquefied natural gas bottle is characterized in that a liquid reserving groove (14) is arranged at the bottom in the bottle body (1), and a pipe orifice of the liquid outlet pipeline (4) is positioned at the bottom of the bottle body (1) and outside the liquid reserving groove (14); the buffer tank (2) is arranged at one end part in the bottle body (1), a buffer pipeline (21) communicating the inner cavity of the bottle body (1) with the inner cavity of the buffer tank (2) is arranged at the lower side of the buffer tank, a drain hole (211) is formed in the side wall of the buffer pipeline (21), and the drain hole (211) is positioned in the buffer tank (2) and close to the bottom of the buffer tank (2); a first branch (6) and a second branch (7) are arranged on the exhaust pipeline (5), the first branch (6) is connected with the liquid outlet pipeline (4), and a first pressure regulating valve (61) is arranged on the first branch (6); and a second pressure regulating valve (71) is arranged on the second branch (7), and the second branch (7) is used for connecting an air return gun of the gas station.

2. The environmentally friendly and energy-saving liquefied natural gas cylinder as claimed in claim 1, wherein the volume of the liquid retention tank (14) is 0.5% -1.0% of the volume of the cylinder body.

3. The environmentally friendly and energy-saving liquefied natural gas cylinder as claimed in claim 1, wherein the lower end of the buffer pipe (21) is close to the bottom of the cylinder body (1), and the upper end is close to the top of the buffer tank (2).

4. An environmentally friendly and energy saving liquefied natural gas cylinder according to claim 1, wherein the first branch (6) and the second branch (7) are provided on the exhaust pipe (5) between the discharge valve (53) and the cylinder body (1).

5. The environment-friendly and energy-saving liquefied natural gas cylinder according to claim 1, wherein the liquid outlet pipe (4) is provided with a filter valve (41), a liquid valve (42), a vaporizer (43) and a pressure reducing valve (44) in sequence from the cylinder (1) to the outside, and the first branch (6) is connected to the liquid outlet pipe (4) between the cylinder (1) and the filter valve (41).

6. An environment-friendly and energy-saving liquefied natural gas cylinder according to any one of claims 1 to 5, wherein the liquid inlet pipe (3), the liquid outlet pipe (4) and the gas outlet pipe (5) are located at the other end of the cylinder body (1) where the buffer tank (2) is located.

7. The environment-friendly and energy-saving liquefied natural gas cylinder as claimed in claim 1, wherein a liquid level meter (15) is further arranged in the cylinder body (1), and the liquid level meter (15) is connected with a display controller (151).

8. The liquefied natural gas cylinder of the environmental protection and energy saving of claim 1, wherein the cylinder body (1) is of a double-layer steel structure and comprises a liner (11) and a shell (12), a heat insulation layer (13) is wound outside the liner (11), and a vacuum is formed between the liner (11) and the shell (12).