CN218720623U - Compressed gas emptying device for LNG unloading - Google Patents
Compressed gas emptying device for LNG unloading Download PDFInfo
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- CN218720623U CN218720623U CN202223007926.2U CN202223007926U CN218720623U CN 218720623 U CN218720623 U CN 218720623U CN 202223007926 U CN202223007926 U CN 202223007926U CN 218720623 U CN218720623 U CN 218720623U
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Abstract
The utility model discloses a LNG emptier for unloading, including the box, be provided with tank wagon interface and storage tank interface on the lateral wall of box, be provided with heat exchanger, oil and gas separator and compressor in the box, the heat exchanger sets up on box upper portion through two fixed, and the first entry end of heat exchanger connects the tank wagon interface through first pipeline, and the first exit end of heat exchanger communicates to the compressor air inlet through the second pipeline, and the compressor gas outlet communicates to the second entry end of heat exchanger through oil and gas separator through the third pipeline, and the second exit end of heat exchanger communicates to the storage tank interface through the fourth pipeline; and the side wall of the box body is also provided with an inlet switch valve and an outlet switch valve. The utility model has the advantages of being simple in structure and convenient in operation, be applicable to the tank wagon that has from the pressure boost function and unload, can be with remaining gaseous discharge to the storage tank in the tank wagon, when having avoided the waste, provide reliable guarantee for loading once more of tank wagon next time.
Description
Technical Field
The utility model relates to a liquefied natural gas technical field especially relates to a LNG is compressed gas emptying devices for unloading.
Background
Ultralow temperature liquid such as Liquefied Natural Gas (LNG) is one of important energy sources in energy supply in China, and most of the LNG is transported by a tank car and then is unloaded from the tank car into a storage tank after being transported to a gas station. The main mode that present liquefied natural gas tank wagon unloaded is pump pressure boost unloading or from pressure boost unloading, and no matter what kind of mode of adoption unloads, the cryogenic liquids tank wagon all can produce the gasification at the loading and unloading in-process, and the product gas if this part gas is emptied, can cause serious waste to if not empty, the tank wagon will not fill the dress operation once more.
The Chinese prior patent 202021510470.X discloses an unloading device and an unloading system of a low-temperature liquid tank wagon, wherein the unloading device comprises a compressor, a heat regenerator, a cooling device, a control valve group, a low-temperature liquid storage tank interface and a tank wagon interface, the control valve group selects to communicate the storage tank interface with a second heat exchange outlet and/or a first heat exchange inlet of the heat regenerator, and communicates the tank wagon interface with the first heat exchange inlet and/or the second heat exchange outlet; the device realizes pressurization, unloading and evacuation operation through the back-and-forth switching of the control valve group, can realize normal-temperature pressurization unloading, and can evacuate gas generated in the tank car, thereby avoiding waste.
However, most tank cars at present are pressurized by a pressurizing device in a gas station, and can be unloaded directly by pressure difference after being connected with a storage tank, and only gas generated in the tank car in the unloading process cannot be exhausted, so that the unloading device cannot be applied to the unloading process of the tank car.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a LNG compressed gas emptying devices for unloading of simple structure is provided, can be in the tank wagon after liquid unloads the dress and finishes, with remaining gas outgoing to the storage tank in the tank wagon, when avoiding extravagant, provide the guarantee for loading once more of next tank wagon.
In order to solve the technical problem, the utility model adopts the following technical proposal.
The compressed gas emptying device for LNG unloading comprises a box body, wherein a tank car interface communicated with an inner cavity of a tank car through a metal hose and a storage tank interface communicated with an air inlet of a storage tank through a metal hose are arranged on the side wall of the box body; and the side wall of the box body is also provided with an inlet switch valve for controlling the first pipeline to be opened and closed and an outlet switch valve for controlling the fourth pipeline to be opened and closed.
Above-mentioned LNG is compressed gas emptying devices for unloading, still be provided with the pressure measurement mechanism of monitoring inlet pressure and pressure of giving vent to anger on the box, pressure measurement mechanism is including setting up the manometer of admitting air on the box lateral wall, the manometer of giving vent to anger and the fixed electric cabinet that sets up on the box bottom face and lie in between two supports, the manometer of admitting air is connected to in the first pipeline, and the manometer of giving vent to anger is connected to in the fourth pipeline, and the manometer of admitting air and the manometer output of giving vent to anger are connected with the input of electric cabinet respectively, and the controlled end of compressor is connected to the output of electric cabinet, and the electric cabinet is according to the pressure value of admitting air and the operating condition of the pressure value control compressor of giving vent to anger.
According to the compressed gas emptying device for LNG unloading, the alarm is arranged in the box body, and the controlled end of the alarm is connected with the output end of the electric cabinet.
Above-mentioned LNG is unloaded and is used compressed gas emptying devices, the air inlet department of compressor is provided with the temperature sensor who detects the gaseous temperature value, and temperature sensor's output is connected to the input of electric cabinet.
The compressed gas emptying device for LNG unloading is characterized in that an oil collecting tank communicated with an oil outlet of the oil-gas separator through an oil pipe is further arranged in the tank body.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model has the advantages of being simple in structure and convenient in operation, the tank wagon that is applicable to and has self-pressurization function uses at the in-process of unloading, can unload the back that finishes in the tank wagon liquid, with remaining gas outgoing to the storage tank in the tank wagon, when having avoided extravagant, provides reliable guarantee for loading once more of next tank wagon.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention;
fig. 2 is a schematic view of the internal structure of the present invention at another angle.
Wherein: 1. the tank comprises a tank body, 2 storage tank connectors, 3 tank car connectors, 4 inlet switch valves, 5 outlet switch valves, 6 air inlet pressure gauges, 7 air outlet pressure gauges, 8 electric cabinets, 9 heat exchangers, 10 supports, 11 oil-gas separators, 12 compressors, 13 oil collecting tanks, 14 first pipelines, 15 second pipelines and 16 third pipelines.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the following detailed description.
A compressed gas emptying device for LNG unloading is structurally shown in figures 1 and 2 and comprises a box body 1, wherein a tank car connector 3, a storage tank connector 2, an inlet switch valve 4 and an outlet switch valve 5 are arranged on the side wall of the box body 1, and a heat exchanger 9, an oil-gas separator 11 and a compressor 12 are arranged in the box body 1.
The heat exchanger 9 is erected at the upper part of the box body by two brackets 10 fixedly arranged on the bottom end face of the box body, as shown in figure 1. The first inlet end of the heat exchanger 9 is connected with the inner end of the tank wagon interface 3 through a first pipeline 14, the outer end of the tank wagon interface 3 is communicated with the inner cavity of the tank wagon through a metal hose, the first outlet end of the heat exchanger 9 is communicated to the air inlet of the compressor 12 through a second pipeline 15, the air outlet of the compressor is communicated to the second inlet end of the heat exchanger 9 through a third pipeline 16, the second outlet end of the heat exchanger 9 is communicated to the inner end of the storage tank interface 2 through a fourth pipeline, and the storage tank interface 2 is communicated with the storage tank interface 2 of the storage tank air inlet through a metal hose, as shown in fig. 2.
The tank wagon, the metal hose, the tank wagon interface, the first pipeline 14, the first inlet end of the heat exchanger 9, the first outlet end of the heat exchanger 9, the air inlet of the compressor 12, the air outlet of the compressor, the third pipeline 16, the second inlet end of the heat exchanger 9, the second outlet end of the heat exchanger 9, the fourth pipeline, the storage tank interface 2, the metal hose and the storage tank are connected in series to form a circulation path of gas in the tank wagon.
Because the gas of the tank wagon contains oil, in order to ensure that the gas entering the storage tank is clean, the oil-gas separator 11 is connected into a third pipeline between the outlet end of the compressor and the second inlet end of the heat exchanger, and is used for separating the oil in the compressed gas; and the oil outlet of the oil-gas separator is communicated with an oil collecting tank 13 through an oil pipe, so that separated oil can be collected conveniently, and the oil collected in the oil storing tank can be provided for a compressor to use.
The utility model discloses an inlet switch valve 4 and outlet switch valve 5 set up on the lateral wall of box, have seted up the through-hole on the box, and inlet switch valve 4 and outlet switch valve 5's valve shaft passes the through-hole, and its valve block is located corresponding pipeline respectively. A valve plate of the inlet switch valve 4 is positioned in the first pipeline, a hand wheel of the inlet switch valve is positioned outside the box body, and the opening and the closing of the first pipeline are controlled by operating the hand wheel; the valve block of the outlet switch valve 5 is positioned in the fourth pipeline, the hand wheel of the outlet switch valve is also positioned outside the box body, and the opening and the closing of the fourth pipeline are controlled by operating the hand wheel.
For the security of guaranteeing when the evacuation is operated, the utility model discloses pressure measurement mechanism has still been set up on the box for monitor inlet pressure and the pressure of giving vent to anger. The pressure detection mechanism comprises an air inlet pressure gauge 6 and an air outlet pressure gauge 7 which are arranged on the side wall of the box body and an electric cabinet 8 which is fixedly arranged on the bottom end face of the box body, wherein the electric cabinet 8 is positioned between the two supports in the embodiment, as shown in figure 1. Wherein, the manometer 6 of admitting air is connected to in the first pipeline, and the manometer 7 of giving vent to anger is connected to in the fourth pipeline, and the manometer 6 of admitting air and the manometer 7 output of giving vent to anger are connected with the input of electric cabinet respectively, and the controlled end of compressor is connected to the output of electric cabinet, and the electric cabinet firstly supplies power for the compressor, secondly according to the pressure value of admitting air and the operating condition of the pressure value control compressor of giving vent to anger. And an air inlet pressure threshold and an air outlet pressure threshold are arranged in the electric cabinet, and when the air inlet pressure is lower than the air inlet pressure threshold or the outlet pressure is higher than the air outlet pressure threshold, the compressor is controlled to stop running.
In this embodiment, the air inlet department of compressor is provided with the temperature sensor who detects the gas temperature value, and temperature sensor's output is connected to the input of electric cabinet. The electric cabinet can be according to the gaseous temperature value of the air inlet of compressor, the operating condition of control compressor. And an air inlet temperature threshold is arranged in the electric cabinet, and when the air inlet temperature is lower than the air inlet temperature threshold, the compressor is controlled to stop running.
Certainly, the utility model discloses the electric cabinet still can gather the operating current of compressor, when operating current is greater than the rated value, controls the compressor shut down to guarantee the safety of equipment.
An alarm is also arranged in the box body, the alarm is fixed above the electric cabinet, and the controlled end of the alarm is connected with the output end of the electric cabinet; when the pressure, the temperature or the working current exceed the threshold value, the alarm sends out an alarm to remind an operator to process in time.
The utility model is used for when the surplus gas in the tank wagon is emptied, the tank wagon is communicated with the tank wagon interface of the utility model and the storage tank is communicated with the storage tank interface of the utility model through two metal hoses; the inlet and outlet switching valves 4 and 5 are opened to connect the gas flow path. At the moment, gas in the tank car firstly enters a heat exchanger, and low-temperature gas is heated to normal-temperature gas through the heat exchanger; then the normal temperature gas enters a compressor to be pressurized, so that the pressure of the gas output from the gas outlet of the compressor is greater than the pressure of the storage tank; then sending the high-pressure gas into an oil-gas separator to separate oil in the high-pressure gas; the gas enters the heat exchanger again, is changed into high-pressure low-temperature gas after heat exchange and flows into the storage tank; therefore, the purpose of completely exhausting the gas in the tank wagon is realized, and the waste of liquefied gas is avoided.
Claims (5)
- LNG is unloaded and is used compressed gas emptying devices, including box (1), its characterized in that: a tank car interface (3) communicated with an inner cavity of a tank car through a metal hose and a storage tank interface (2) communicated with a storage tank air inlet through a metal hose are arranged on the side wall of the tank body (1), a heat exchanger (9), an oil-gas separator (11) and a compressor (12) are arranged in the tank body (1), the heat exchanger (9) is erected on the upper portion of the tank body through two supports (10) fixedly arranged on the bottom end face of the tank body, a first inlet end of the heat exchanger (9) is connected with the tank car interface (3) through a first pipeline (14), a first outlet end of the heat exchanger (9) is communicated to the air inlet of the compressor (12) through a second pipeline (15), an air outlet of the compressor is communicated to a second inlet end of the heat exchanger (9) through a third pipeline (16) and the oil-gas separator (11), and a second outlet end of the heat exchanger (9) is communicated to the storage tank interface (2) through a fourth pipeline; and the side wall of the box body is also provided with an inlet switch valve (4) for controlling the first pipeline to be opened and closed and an outlet switch valve (5) for controlling the fourth pipeline to be opened and closed.
- 2. The compressed gas evacuation device for LNG unloading according to claim 1, wherein: the pressure detection mechanism is arranged on the box body and used for monitoring air inlet pressure and air outlet pressure, the pressure detection mechanism comprises an air inlet pressure gauge (6) arranged on the side wall of the box body, an air outlet pressure gauge (7) and an electric cabinet (8) fixedly arranged on the bottom end face of the box body and located between the two supports, the air inlet pressure gauge (6) is connected to the first pipeline, the air outlet pressure gauge (7) is connected to the fourth pipeline, the output ends of the air inlet pressure gauge (6) and the air outlet pressure gauge (7) are respectively connected with the input end of the electric cabinet, the output end of the electric cabinet is connected with the controlled end of the compressor, and the electric cabinet controls the working state of the compressor according to the air inlet pressure value and the air outlet pressure value.
- 3. The compressed gas evacuation device for LNG unloading according to claim 2, wherein: an alarm is arranged in the box body, and the controlled end of the alarm is connected with the output end of the electric cabinet.
- 4. The compressed gas evacuation device for LNG unloading according to claim 1, wherein: the air inlet department of compressor is provided with the temperature sensor who detects the gas temperature value, and temperature sensor's output is connected to the input of electric cabinet.
- 5. The compressed gas evacuation device for LNG unloading according to claim 1, wherein: an oil collecting tank (13) communicated with an oil outlet of the oil-gas separator through an oil pipe is further arranged in the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223007926.2U CN218720623U (en) | 2022-11-11 | 2022-11-11 | Compressed gas emptying device for LNG unloading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223007926.2U CN218720623U (en) | 2022-11-11 | 2022-11-11 | Compressed gas emptying device for LNG unloading |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218720623U true CN218720623U (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223007926.2U Active CN218720623U (en) | 2022-11-11 | 2022-11-11 | Compressed gas emptying device for LNG unloading |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218720623U (en) |
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2022
- 2022-11-11 CN CN202223007926.2U patent/CN218720623U/en active Active
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