Improved liquefied petroleum gas station

Abstract

In order to overcome the defects in the prior art, the utility model provides an improved liquefied petroleum gas station which comprises at least two liquefied petroleum gas storage tanks. The liquefied petroleum gas storage tank is connected with the fire extinguishing system, the emptying pipeline, the pressurization system, the LPG supply system, the LPG output system, the LPG pressure return system and the balance pressure system. And the LPG supply system supplies the LPG input by unloading to the liquefied petroleum gas storage tank. LPG in the liquefied petroleum gas storage tank is output to the vaporizer through the LPG output system, and the vaporizer gasifies the LPG and then outputs the gasified LPG to the LPG pipe network through the LPG output pipeline. The end, close to the vaporizer, of the LPG output system conveys redundant LPG back to the liquefied petroleum gas storage tank through the LPG back-pressure system. According to the liquefied petroleum gas station, the advantages of the technological process of a traditional liquefied petroleum gas station are combined, and safe, stable and continuous operation of the liquefied petroleum gas station can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas supply of liquefied petroleum gas stations, in particular to an improved liquefied petroleum gas station. Background Art

[0002] As a chemical raw material, liquefied petroleum gas can be separated into propane, propylene, butane, etc., which are used to synthesize plastics, rubber, medicine, dyes, etc., and are increasingly valued by people. At the same time, due to its high calorific value, no smoke, no carbon slag and many other advantages, liquefied petroleum gas can also be used as fuel and is widely used in industrial kilns, furnaces, torches, and other fields.

[0003] In many cases, LPG stations are used as energy sources, and the transmission pipeline network must be continuous and stable. At present, LPG stations are mostly operated intermittently or with disturbances in the gas supply network, and it is impossible to unload the LPG station while it is running to ensure that the pipeline network is not disturbed. At the same time, the existing technology is difficult to deal with the problem of unstable gas supply of LPG stations caused by equipment failure, unloading, etc. during the operation of LPG stations.

[0004] At present, the gas supply process of liquefied petroleum gas stations in the industry is mainly divided into two design modes:

[0005] (1) Use an above-ground liquefied petroleum gas storage tank, and the liquefied gas flows to the vaporizer by itself. When the user has higher pipe network requirements, the liquefied gas cannot flow to the vaporizer by itself, and when the temperature is low, the saturated vapor pressure of the liquefied petroleum gas in the storage tank is low, which will lead to insufficient liquefied gas in the vaporizer, and then lead to insufficient gas supply capacity of the liquefied petroleum gas station.

[0006] (2) Use underground storage tanks and configure high-pressure nitrogen to pressurize liquefied gas to the vaporizer. This mode is not conducive to the inspection of leak points. At the same time, the water injection protection process of the storage tank is difficult to implement, and the high-pressure nitrogen pressure stabilization system has high precision requirements, which is easy to cause fluctuations in the gas supply network. Utility Model Content

[0007] In order to solve the deficiencies of the prior art, the utility model provides an improved liquefied petroleum gas station, comprising: at least two liquefied petroleum gas storage tanks. The liquefied petroleum gas storage tanks are respectively connected to a fire protection system, a venting pipeline, a pressurizing system, an LPG supply system, an LPG output system, an LPG back pressure system, and a balanced pressure system.

[0008] The LPG supply system supplies the LPG input from the unloading truck to the liquefied petroleum gas storage tank. The LPG in the liquefied petroleum gas storage tank is output to the vaporizer through the LPG output system, and the vaporizer vaporizes the LPG and outputs it to the LPG network through the LPG output pipeline. The LPG output system transports the excess LPG back to the liquefied petroleum gas storage tank through the LPG back pressure system at the end close to the vaporizer.

[0009] The fire fighting system is used for fire fighting of liquefied petroleum gas storage tanks.

[0010] The venting pipeline is respectively connected to the liquefied petroleum gas storage tank, the vaporizer, and the boosting system, and is used to vent the tail gas to the flare.

[0011] The boosting system is used to boost the LPG in the liquefied petroleum gas storage tank.

[0012] One end of the pressure balancing system is connected to the corresponding liquefied petroleum gas storage tank through a gate valve, and the other end is connected to the external pressure balancing tank through a ball valve, a gate valve and a hose. The pressure balancing system is used to balance the pressure of the liquefied petroleum gas storage tank.

[0013] Furthermore, the liquefied petroleum gas storage tank is provided with an LPG input pipe, an LPG output pipe, an LPG back pressure pipe, a vent pipe, a cold liquid pipe, and a boost pipe, wherein:

[0014] The LPG input pipe is connected to the LPG supply system, the LPG output pipe is connected to the LPG output system, the LPG back pressure pipe is connected to the LPG back pressure system, the vent pipe is connected to the vent line, the cold liquid pipe is connected to the fire protection system, and the boost pipe is connected to the boost system.

[0015] Furthermore, the LPG supply system includes: an LPG unloading interface device connected to the unloading vehicle, the LPG unloading interface device is connected to the LPG supply pipe through the first LPG supply pipeline and the second LPG supply pipeline, and the LPG supply pipe is respectively connected to the LPG supply interface end of the liquefied petroleum gas storage tank.

[0016] The first LPG supply pipeline and the second LPG supply pipeline are installed with the same mechanisms, which are: a first ball valve, a first Y-type filter, a first hose, a first boosting hydrocarbon pump, a second hose, a first check valve, and a second ball valve are arranged in sequence from the LPG unloading interface device to the LPG supply pipe.

[0017] Furthermore, the LPG output system includes: an LPG output main pipe connected to the LPG output interface end of each liquefied petroleum gas storage tank. The LPG output main pipe is connected to the output pipe through a first output pipeline system. One end of the output pipe is connected to the back pressure main pipe of the LPG back pressure system, and the other end is connected to the LPG input end of the vaporizer through a second output pipeline system.

[0018] Furthermore, the first output pipeline system includes: a first output pipeline, a second output pipeline, and a third output pipeline arranged in parallel between the LPG output main pipe and the output pipe. The first output pipeline is provided with a third ball valve. The second output pipeline and the third output pipeline are provided with the same mechanism, which are: a fourth ball valve, a second Y-type filter, a third hose, a second boosting hydrocarbon pump, a fourth hose, a second check valve, and a fifth ball valve arranged in sequence from the LPG output main pipe to the output pipe.

[0019] The second output pipeline system includes: a fourth output pipeline and a fifth output pipeline arranged in parallel between the output pipe and the vaporizer. The pipeline of the fourth output pipeline is provided with a sixth ball valve, a third Y-type filter, a first pneumatic shut-off valve, and a seventh ball valve in sequence from the output pipe to the vaporizer. The fifth output pipeline is provided with a first shut-off valve.

[0020] Furthermore, the heat source end of the vaporizer is connected to the saturated steam network through the heating system, the heat exhaust end is connected to the steam condensate network through the condensate discharge system, the vent end is connected to the vent pipeline through the vaporizer vent pipe group, and the output end is connected to the LPG network through the LPG output pipeline.

[0021] The heating system is provided with a first heating pipe and a second heating pipe in parallel at one end close to the vaporizer. The first heating pipe is provided with a second stop valve, and the second heating pipe is provided with a first gate valve, a fourth Y-type filter, a first pressure regulating valve, and a second gate valve in sequence from the saturated steam pipe network to the vaporizer.

[0022] The condensate discharge system is provided with a first row of cold pipes and a second row of cold pipes in parallel at one end close to the evaporator. The first row of cold pipes is provided with a third stop valve, and the second row of cold pipes is provided with a third gate valve, a steam trap, and a fourth gate valve in sequence from the evaporator to the steam condensate pipe network.

[0023] The carburetor vent pipe group is provided with a first carburetor vent pipe and a second carburetor vent pipe in parallel at one end close to the carburetor. The first carburetor vent pipe is provided with an eighth ball valve. The second carburetor vent pipe is provided with a ninth ball valve, a first angle spring safety valve, and a tenth ball valve in sequence from the carburetor to the vent pipeline.

[0024] Furthermore, the LPG output pipeline is provided with a first flow meter, a second pressure regulating valve, and an eleventh ball valve in sequence from the gas phase output end of the vaporizer to the LPG pipeline network, and is connected to the vent pipeline through a fourth stop valve, a second angle spring safety valve, and a twelfth ball valve which are arranged in sequence between the second pressure regulating valve and the eleventh ball valve.

[0025] Furthermore, the boosting system includes: a boosting exhaust pipe and a boosting pipeline.

[0026] One end of the booster pipeline is connected to the high-pressure nitrogen system, and the other end is connected to the liquefied petroleum gas storage tank. At the end close to the high-pressure nitrogen system, a thirteenth ball valve and a third pressure regulating valve are sequentially arranged from the high-pressure nitrogen system to the liquefied petroleum gas storage tank.

[0027] One end of the pressurized exhaust pipe is connected to the pressurized pipeline between the third pressure regulating valve and the liquefied petroleum gas storage tank near the third pressure regulating valve, and the other end is connected to the exhaust pipeline through the fourteenth ball valve, the third angle spring safety valve, and the fifteenth ball valve which are arranged in sequence.

[0028] Furthermore, the fire protection system includes a cooling water pipeline and a sprinkler pipe group.

[0029] One end of the cooling water pipeline is connected to the fire water network, and the other end is connected to the fire water interface end of the liquefied petroleum gas storage tank. At the end close to the liquefied petroleum gas storage tank, the sixteenth ball valve, the fifth hose, the water injection pump, the sixth hose, and the seventeenth ball valve are sequentially provided from the fire water network to the liquefied petroleum gas storage tank.

[0030] One end of the nozzle pipe group is connected to the fire water pipe network, and the other end extends to the top of each liquefied petroleum gas storage tank, and a nozzle group consisting of several nozzles is provided at a position corresponding to each liquefied petroleum gas storage tank. The nozzle pipe group is provided with an eighteenth ball valve and a fourth pressure regulating valve in sequence from the fire water pipe network to the nozzle group near the nozzle group.

[0031] Furthermore, the LPG back pressure system includes: a back pressure main pipe having one end connected to the LPG back pressure receiving end of the liquefied petroleum gas storage tank and the other end connected to the LPG output system. The back pressure main pipe is provided with a diaphragm valve and a nineteenth ball valve in sequence from the LPG output system to the liquefied petroleum gas storage tank near the LPG output system.

[0032] The utility model has at least one of the following beneficial effects:

[0033] (1) The utility model organically combines the advantages of the process flow of the traditional liquefied petroleum gas station, the process and operation are simple, and the liquefied petroleum gas station can be operated safely, stably and continuously.

[0034] (2) The utility model avoids the shortcomings of the traditional liquefied petroleum gas station, such as unstable gas supply pressure, mutual interference between the unloading and operation systems, incomplete unloading of tank trucks, difficulty in implementing the underground tank water filling process and inconvenience in leak detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the equipment pipeline structure of the improved liquefied petroleum gas station of the utility model;

[0036] Figure 2 This is a schematic diagram of the structure of the liquefied petroleum gas storage tank of the utility model;

[0037] Figure 3 It is a partial structural schematic diagram of the LPG supply system of the utility model;

[0038] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle A1 part;

[0039] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of the middle A2 part;

[0040] Figure 6 This is a partial structural diagram of the LPG output system of the utility model;

[0041] Figure 7 for Figure 6 A schematic diagram of the enlarged structure of the middle B1 part;

[0042] Figure 8 for Figure 6 A schematic diagram of the enlarged structure of the middle B2 part;

[0043] Fig. 9 It is a partial structural schematic diagram of the vaporizer and supporting devices of the utility model;

[0044] Fig.10 for Fig. 9 A schematic diagram of the enlarged structure of the C1 part;

[0045] Fig.11 for Fig. 9 A schematic diagram of the enlarged structure of the middle C2 part;

[0046] Fig.12 for Fig. 9 A schematic diagram of the enlarged structure of the C3 part;

[0047] Fig.13 for Fig. 9 A schematic diagram of the enlarged structure of the middle C4 part;

[0048] Fig.14 It is a partial structural schematic diagram of the boosting system of the utility model;

[0049] Fig.15 It is a partial structural schematic diagram of the fire protection system of the utility model;

[0050] Fig.16 for Fig.15 The enlarged structural diagram of the E1 part in the middle;

[0051] Fig.17 for Fig.15 Schematic diagram of the enlarged structure of the E2 part in the middle. DETAILED DESCRIPTION

[0052] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0053] Please note that the terms "above", "below", "left", "right", "top", "top", "bottom", "bottom", etc. used in the present invention to describe the positional relationship do not represent the absolute positional relationship between the modules / components / assemblies / components / parts, but the relative positional relationship between the modules / components / assemblies / components / parts.

[0054] The utility model exemplarily provides an improved liquefied petroleum gas station, such as Figure 1 As shown, it comprises: at least two liquefied petroleum gas storage tanks 1. The liquefied petroleum gas storage tanks 1 are connected to a fire protection system 10, a venting pipeline 8, a pressurizing system 9, an LPG supply system 2, an LPG output system 3, an LPG back pressure system 11, and a balanced pressure system 12 respectively.

[0055] The LPG supply system 2 supplies the LPG input from the unloading truck to the liquefied petroleum gas storage tank 1. The LPG in the liquefied petroleum gas storage tank 1 is output to the vaporizer 4 through the LPG output system 3. The vaporizer 4 vaporizes the LPG and outputs it to the LPG network through the LPG output pipeline 7. The LPG output system 3 transports the excess LPG back to the liquefied petroleum gas storage tank 1 through the LPG back pressure system 11 at one end close to the vaporizer 4.

[0056] The fire fighting system 10 is used for fire fighting of the liquefied petroleum gas storage tank 1 .

[0057] The venting pipeline 8 is respectively connected to the liquefied petroleum gas storage tank 1, the vaporizer 4, and the boosting system, and is used to vent the tail gas to the flare.

[0058] The boosting system 9 is used to boost the LPG in the liquefied petroleum gas storage tank 1 .

[0059] One end of the pressure balancing system 12 is connected to the corresponding liquefied petroleum gas storage tank 1 through a gate valve, and the other end is connected to the external pressure balancing tank through a ball valve, a gate valve, and a hose. The pressure balancing system 12 is used to balance the pressure of the liquefied petroleum gas storage tank 1.

[0060] Compared with the prior art, the present invention is provided with at least two liquefied petroleum gas storage tanks 1, which can ensure that when one liquefied petroleum gas storage tank 1 is inputting LPG or fails, at least one liquefied petroleum gas storage tank 1 can deliver LPG to the outside. And the pressure inside each liquefied petroleum gas storage tank 1 is equalized by the balance pressure system 12 through the external balance pressure tank, especially before the online tank cutting, the pressure equalization operation can ensure that the liquefied gas entering the vaporizer is uniform and constant, thereby ensuring the stability of the pipeline network pressure and realizing the disturbance-free online tank cutting.

[0061] At the same time, the LPG in the liquefied petroleum gas storage tank 1 is pressurized by the set boosting system 9, thereby overcoming the problem that the liquefied petroleum gas storage tank 1 cannot provide sufficient pressure when the weather is cold or the pressure requirement of the liquefied petroleum gas pipeline network is high, resulting in poor self-flow of liquefied gas.

[0062] The utility model exemplarily provides a liquefied petroleum gas storage tank 1, such as Figure 2 As shown, it includes: an LPG input pipe 101, an LPG output pipe 102, an LPG back pressure pipe 103, a vent pipe 104, a cold liquid pipe 105, and a boost pipe 106, wherein:

[0063] The LPG input pipe 101 is connected to the LPG supply system 2, the LPG output pipe 102 is connected to the LPG output system 3, the LPG back pressure pipe 103 is connected to the LPG back pressure system 11, the vent pipe 104 is connected to the vent line 8, the cold liquid pipe 105 is connected to the fire protection system 10, and the boost pipe 106 is connected to the boost system 9.

[0064] This arrangement separates the interfaces inside the liquefied petroleum gas storage tank 1 from each other, thus avoiding crosstalk between pipelines.

[0065] The present invention exemplarily provides an LPG supply system 2, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, it includes: an LPG unloading interface device 202 connected to an unloading vehicle 201, wherein the LPG unloading interface device 201 is connected to an LPG supply pipe 205 through a first LPG supply pipeline 203 and a second LPG supply pipeline 204, and the LPG supply pipe 205 is respectively connected to an LPG supply interface end of a liquefied petroleum gas storage tank 1, for example Figure 2 The LPG input pipe 101 is shown. The LPG unloading interface device 202 can be an existing LPG unloading system.

[0066] The first LPG supply pipeline 203 and the second LPG supply pipeline 204 are installed with the same mechanisms, which are: a first ball valve, a first Y-type filter, a first hose, a first boosting hydrocarbon pump, a second hose, a first check valve, and a second ball valve are arranged in sequence from the LPG unloading interface device 202 to the LPG supply pipe 205.

[0067] Compared with the traditional single-design LPG supply pipeline, the utility model adopts a double pipeline group design, and the two pipeline groups are provided with booster hydrocarbon pumps. In this way, when the delivery pressure fluctuates, the fluctuation change borne by each pipeline group will be halved. Therefore, through the pressure balancing effect of the booster hydrocarbon pumps of the two pipeline groups, the pressure fluctuation of the LPG delivered to the liquefied petroleum gas storage tank 1 can be significantly reduced compared with the pressure fluctuation at the unloading end, thereby ensuring the stability of the LPG input.

[0068] The present invention exemplarily provides an LPG output system 3, such as Figure 1 , Figure 6 , Figure 7 , Figure 8 As shown, it includes: an LPG output interface end with each liquefied petroleum gas storage tank 1, such as Figure 2 The LPG output pipe 102 is connected to the LPG output main pipe 301. The LPG output main pipe 301 is connected to the output pipe 302 through a first output pipeline system. One end of the output pipe 302 is connected to the back pressure main pipe 1101 of the LPG back pressure system 11, and the other end is connected to the LPG input end of the vaporizer 4 through a second output pipeline system.

[0069] The first output pipeline system includes: a first output pipeline 307, a second output pipeline 304, and a third output pipeline 303, which are arranged in parallel between the LPG output main pipe 301 and the output pipe 302. The first output pipeline 307 is provided with a third ball valve. The second output pipeline 304 and the third output pipeline 303 are installed with the same mechanism, which are: a fourth ball valve, a second Y-type filter, a third hose, a second boosting hydrocarbon pump, a fourth hose, a second check valve, and a fifth ball valve, which are arranged in sequence from the LPG output main pipe 301 to the output pipe 302.

[0070] The second output pipeline system includes: a fourth output pipeline 306 and a fifth output pipeline 305 which are arranged in parallel between the output pipe 302 and the vaporizer 4. A sixth ball valve, a third Y-type filter, a first pneumatic shut-off valve, and a seventh ball valve are arranged in sequence on the fourth output pipeline 306 from the output pipe 302 to the vaporizer 4. A first shut-off valve is arranged on the fifth output pipeline 305.

[0071] The prior art generally directly connects the liquefied petroleum gas storage tank 1 and the vaporizer 4 through a delivery pipe, so the LPG pressure in the delivery process cannot be effectively adjusted. The utility model makes improvements on this. When the pressure of the liquefied petroleum gas storage tank 1 is sufficient, the first output pipeline 307 is opened, the second output pipeline 304 and the third output pipeline 303 are closed, and the pressure of the liquefied petroleum gas storage tank 1 itself is used as the power source for LPG delivery. When the pressure of the liquefied petroleum gas storage tank 1 is insufficient, the first output pipeline 307 is closed, one of the second output pipeline 304 and the third output pipeline 303 is opened, or the second output pipeline 304 and the third output pipeline 303 are opened at the same time, and the boosting hydrocarbon pumps on the second output pipeline 304 and the third output pipeline 303 are used to boost and output LPG. Opening the second output pipeline 304 and the third output pipeline 303 at the same time can also play a role in reducing pressure fluctuations.

[0072] During normal delivery, the fourth output pipeline 306 is opened, and a safety interlock mechanism is formed by the sixth ball valve, the third Y-type filter, the first pneumatic shut-off valve, and the seventh ball valve, which can be closed when necessary to stop delivering LPG to the vaporizer 4. When a valve failure occurs in the fourth output pipeline 306, the first shut-off valve is activated, and the fifth output pipeline 305 for temporary supply is opened to deliver LPG to the vaporizer 4.

[0073] The utility model exemplarily provides a vaporizer 4, such as Fig. 9 As shown, the heat source end of the vaporizer 4 is connected to the saturated steam network through the heating system 5, the heat exhaust end is connected to the steam condensate network through the condensate discharge system 6, the vent end is connected to the vent pipeline 8 through the vaporizer vent pipe group, and the output end is connected to the LPG network through the LPG output pipeline 7.

[0074] like Fig.10 As shown, the heating system 5 is provided with a first heating pipe 501 and a second heating pipe 502 in parallel at one end close to the vaporizer 4. The first heating pipe 501 is provided with a second stop valve, and the second heating pipe 502 is provided with a first gate valve, a fourth Y-type filter, a first pressure regulating valve, and a second gate valve in sequence from the saturated steam network to the vaporizer 4.

[0075] like Fig.11 As shown, the condensate discharge system 6 is provided with a first cooling pipe 601 and a second cooling pipe 602 in parallel at one end close to the evaporator 4. The first cooling pipe 601 is provided with a third stop valve, and the second cooling pipe 602 is provided with a third gate valve, a steam trap, and a fourth gate valve in sequence from the evaporator 4 to the steam condensate pipe network.

[0076] like Fig.12As shown, the vaporizer vent pipe group is provided with a first vaporizer exhaust pipe 401 and a second vaporizer exhaust pipe 402 in parallel at one end close to the vaporizer 4. The first vaporizer exhaust pipe 401 is provided with an eighth ball valve. The second vaporizer exhaust pipe 402 is provided with a ninth ball valve, a first angle spring safety valve, and a tenth ball valve in sequence from the vaporizer 4 to the vent line 8.

[0077] The above arrangement forms a safety backup mechanism. When the second heat supply pipe 502 has a valve abnormality, the second stop valve can be opened and the first heat supply pipe 501 can be used for temporary heat supply. Similarly, when the second cold discharge pipe 602 has a valve abnormality, the third stop valve can be opened and the first cold discharge pipe 601 can be used for temporary cold discharge. Similarly, when the second vaporizer exhaust pipe 402 has a valve abnormality, the eighth ball valve can be opened and the first vaporizer exhaust pipe 401 can be used for temporary emptying.

[0078] The utility model exemplarily provides an LPG output pipeline 7, such as Figure 1 , Fig. 9 , Fig.13 As shown, it includes: a first flow meter, a second pressure regulating valve, and an eleventh ball valve are sequentially arranged between the gas phase output end of the vaporizer 4 and the LPG pipeline network, and the second pressure regulating valve and the eleventh ball valve are connected to the vent pipeline 8 through a fourth stop valve, a second angle spring safety valve, and a twelfth ball valve arranged in sequence.

[0079] When the LPG gas pressure output by the vaporizer 4 exceeds the LPG pipeline network, the excess LPG can be vented to the vent pipeline 8 by opening the fourth stop valve, the second angle spring safety valve and the twelfth ball valve.

[0080] The present invention exemplarily provides a boosting system 9, such as Figure 1 and Fig.14 As shown, it includes: a pressurization exhaust pipe 901 and a pressurization pipeline 902.

[0081] One end of the booster pipeline 902 is connected to the high-pressure nitrogen system, and the other end is connected to the liquefied petroleum gas storage tank 1, for example Figure 2 The boost pipe 106 shown in the figure has a thirteenth ball valve and a third pressure regulating valve arranged in sequence from the high-pressure nitrogen system to the liquefied petroleum gas storage tank 1 at one end close to the high-pressure nitrogen system.

[0082] One end of the boost exhaust pipe 901 is connected to the boost pipeline 902 between the third pressure regulating valve and the liquefied petroleum gas storage tank 1 near the third pressure regulating valve, and the other end is connected to the exhaust pipeline 8 through the fourteenth ball valve, the third angle spring safety valve, and the fifteenth ball valve which are arranged in sequence.

[0083] At this time, the thirteenth ball valve and the third pressure regulating valve can be opened to increase the pressure of LPG in the liquefied petroleum gas storage tank 1 through the high-pressure nitrogen supplied by the high-pressure nitrogen system, thereby pressurizing the LPG in the liquefied petroleum gas storage tank 1.

[0084] When the pressure provided by the high-pressure nitrogen system is relatively high, the fourteenth ball valve, the third angle spring safety valve and the fifteenth ball valve can be opened to discharge the excess high-pressure nitrogen to the discharge pipeline 8 through the pressurized discharge pipe 901.

[0085] The utility model exemplarily provides a fire fighting system 10, such as Figure 1 , Fig.15 , Fig.16 , Fig.17 As shown, it includes a cooling water pipeline 1001 and a nozzle pipe group 1002.

[0086] One end of the cooling water pipeline 1001 is connected to the fire water network, and the other end is connected to the fire water interface of the liquefied petroleum gas storage tank 1. Figure 2 The cold liquid pipe 105 shown in the figure has a sixteenth ball valve, a fifth hose, a water injection pump, a sixth hose and a seventeenth ball valve arranged in sequence from the fire water pipe network to the liquefied petroleum gas storage tank 1 at one end close to the liquefied petroleum gas storage tank 1.

[0087] One end of the nozzle pipe group 1002 is connected to the fire water pipe network, and the other end extends to the top of each liquefied petroleum gas storage tank 1, and a nozzle group consisting of several nozzles is provided at a position corresponding to each liquefied petroleum gas storage tank 1. The nozzle pipe group 1002 is provided with an eighteenth ball valve and a fourth pressure regulating valve in sequence from the fire water pipe network to the nozzle group near the nozzle group.

[0088] At this point, you can choose:

[0089] By opening the sixteenth ball valve, the fifth hose, the water injection pump, the sixth hose, and the seventeenth ball valve, fire water is directly injected into the liquefied petroleum gas storage tank 1, which plays a role in emergency cooling of the interior of the liquefied petroleum gas storage tank 1. Since the pressure in the liquefied petroleum gas storage tank 1 may be higher than the pressure in the fire water pipe network, the utility model adds a water injection pump to increase the injection pressure of the fire water.

[0090] Open the eighteenth ball valve and the fourth pressure regulating valve, so that the fire water in the fire water pipe network is sprayed out from the nozzle, which plays a role in emergency cooling of the outside of the liquefied petroleum gas storage tank 1.

[0091] This arrangement effectively realizes fire control of the liquefied petroleum gas storage tank 1 .

[0092] The present invention exemplarily provides an LPG back pressure system 11, such as Figure 1 , Figure 7As shown, it includes: one end is connected to the LPG back pressure receiving end of the liquefied petroleum gas storage tank 1, for example Figure 2 The LPG back pressure pipe 103 shown in FIG. The other end of the back pressure main pipe 1101 is connected to the LPG output system 3. The back pressure main pipe 1101 is provided with a diaphragm valve and a nineteenth ball valve in sequence from the LPG output system 3 to the liquefied petroleum gas storage tank 1 near the LPG output system 3.

[0093] When the LPG pressure outputted from the liquefied petroleum gas storage tank 1 to the vaporizer 4 through the LPG output system 3 is relatively high, a portion of the LPG can be transported back to the liquefied petroleum gas storage tank 1 through the back pressure main pipe 1101 by opening the diaphragm valve and the nineteenth ball valve, thereby preventing the over-pressure LPG from damaging the vaporizer 4.

[0094] When the vaporizer 4 stops accepting LPG input, if high-pressure LPG still exists in the LPG output system 3, the remaining LPG in the LPG output system 3 can be transported back to the liquefied petroleum gas storage tank 1 by starting the active conveying device of the LPG output system 3, such as a booster hydrocarbon pump, and connecting the LPG back-pressure system 11.

[0095] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An improved liquefied petroleum gas station, characterized in that: include: At least two liquefied petroleum gas storage tanks (1); the liquefied petroleum gas storage tanks (1) are respectively connected to a fire protection system (10), a venting pipeline (8), a pressurization system (9), an LPG supply system (2), an LPG output system (3), an LPG back pressure system (11), and a balanced pressure system (12); The LPG supply system (2) supplies the LPG input from the unloading truck to the liquefied petroleum gas storage tank (1); the LPG in the liquefied petroleum gas storage tank (1) is output to the vaporizer (4) through the LPG output system (3); the vaporizer (4) vaporizes the LPG and outputs it to the LPG network through the LPG output pipeline (7); the LPG output system (3) at one end close to the vaporizer (4) transports the excess LPG back to the liquefied petroleum gas storage tank (1) through the LPG back pressure system (11); The fire fighting system (10) is used for fire fighting on a liquefied petroleum gas storage tank (1); The venting pipeline (8) is respectively connected to the liquefied petroleum gas storage tank (1), the vaporizer (4), and the boosting system, and is used to vent the tail gas to the flare; The boosting system (9) is used to boost the LPG in the liquefied petroleum gas storage tank (1); One end of the pressure balancing system (12) is connected to the corresponding liquefied petroleum gas storage tank (1) via a gate valve, and the other end is connected to an external pressure balancing tank via a ball valve, a gate valve, and a hose; the pressure balancing system (12) is used to balance the pressure of the liquefied petroleum gas storage tank (1).

2. The improved liquefied petroleum gas station according to claim 1, characterized in that: The liquefied petroleum gas storage tank (1) is provided with an LPG input pipe (101), an LPG output pipe (102), an LPG back pressure pipe (103), a vent pipe (104), a cold liquid pipe (105), and a boost pipe (106), wherein: The LPG input pipe (101) is connected to the LPG supply system (2), the LPG output pipe (102) is connected to the LPG output system (3), the LPG back pressure pipe (103) is connected to the LPG back pressure system (11), the vent pipe (104) is connected to the vent line (8), the cold liquid pipe (105) is connected to the fire protection system (10), and the boost pipe (106) is connected to the boost system (9).

3. The improved liquefied petroleum gas station according to claim 1, characterized in that: The LPG supply system (2) comprises: an LPG unloading interface device (202) connected to the unloading vehicle (201); the LPG unloading interface device (201) is connected to an LPG supply pipe (205) via a first LPG supply pipeline (203) and a second LPG supply pipeline (204); and the LPG supply pipe (205) is respectively connected to an LPG supply interface end of a liquefied petroleum gas storage tank (1); The first LPG supply pipeline (203) and the second LPG supply pipeline (204) are installed with the same mechanism, which are: a first ball valve, a first Y-type filter, a first hose, a first boosting hydrocarbon pump, a second hose, a first check valve, and a second ball valve are arranged in sequence from the LPG unloading interface device (202) to the LPG supply pipe (205).

4. The improved liquefied petroleum gas station according to claim 1, characterized in that: The LPG output system (3) comprises: an LPG output main pipe (301) connected to the LPG output interface end of each liquefied petroleum gas storage tank (1); the LPG output main pipe (301) is connected to an output pipe (302) through a first output pipeline system; one end of the output pipe (302) is connected to a back pressure main pipe (1101) of an LPG back pressure system (11), and the other end is connected to an LPG input end of a vaporizer (4) through a second output pipeline system.

5. The improved liquefied petroleum gas station according to claim 4, characterized in that: The first output pipeline system comprises: a first output pipeline (307), a second output pipeline (304), and a third output pipeline (303) which are arranged in parallel between the LPG output main pipe (301) and the output pipe (302); the first output pipeline (307) is provided with a third ball valve; the second output pipeline (304) and the third output pipeline (303) are provided with the same mechanism, which are: a fourth ball valve, a second Y-type filter, a third hose, a second boosting hydrocarbon pump, a fourth hose, a second check valve, and a fifth ball valve which are arranged in sequence from the LPG output main pipe (301) to the output pipe (302); The second output pipeline system comprises: a fourth output pipeline (306) and a fifth output pipeline (305) which are arranged in parallel between the output pipe (302) and the vaporizer (4); a sixth ball valve, a third Y-type filter, a first pneumatic shut-off valve, and a seventh ball valve are arranged in sequence on the pipeline of the fourth output pipeline (306) from the output pipe (302) to the vaporizer (4); and a first shut-off valve is arranged on the fifth output pipeline (305).

6. The improved liquefied petroleum gas station according to claim 1, characterized in that: The heat source end of the vaporizer (4) is connected to the saturated steam network through the heating system (5), the heat exhaust end is connected to the steam condensate network through the condensate discharge system (6), the vent end is connected to the vent line (8) through the vaporizer vent pipe group, and the output end is connected to the LPG network through the LPG output line (7); The heating system (5) is provided with a first heating pipe (501) and a second heating pipe (502) in parallel at one end close to the vaporizer (4); the first heating pipe (501) is provided with a second stop valve, and the second heating pipe (502) is provided with a first gate valve, a fourth Y-type filter, a first pressure regulating valve, and a second gate valve in sequence from the saturated steam network to the vaporizer (4); The condensate discharge system (6) is provided with a first cooling pipe (601) and a second cooling pipe (602) in parallel at one end close to the vaporizer (4); the first cooling pipe (601) is provided with a third stop valve, and the second cooling pipe (602) is provided with a third gate valve, a steam trap, and a fourth gate valve in sequence from the vaporizer (4) to the steam condensate pipe network; The carburetor vent pipe group is provided with a first carburetor vent pipe (401) and a second carburetor vent pipe (402) in parallel at one end close to the carburetor (4); the first carburetor vent pipe (401) is provided with an eighth ball valve; the second carburetor vent pipe (402) is provided with a ninth ball valve, a first angle spring safety valve, and a tenth ball valve in sequence from the carburetor (4) to the vent pipeline (8).

7. The improved liquefied petroleum gas station according to claim 1, characterized in that: The LPG output pipeline (7) is provided with a first flow meter, a second pressure regulating valve, and an eleventh ball valve in sequence from the gas phase output end of the vaporizer (4) to the LPG pipeline network, and is connected to the vent pipeline (8) through a fourth stop valve, a second angle spring safety valve, and a twelfth ball valve that are arranged in sequence between the second pressure regulating valve and the eleventh ball valve.

8. The improved liquefied petroleum gas station according to claim 1, characterized in that: The pressurizing system (9) comprises: a pressurizing exhaust pipe (901) and a pressurizing pipeline (902); One end of the boosting pipeline (902) is connected to the high-pressure nitrogen system, and the other end is connected to the liquefied petroleum gas storage tank (1). At the end close to the high-pressure nitrogen system, a thirteenth ball valve and a third pressure regulating valve are sequentially provided from the high-pressure nitrogen system to the liquefied petroleum gas storage tank (1); One end of the pressurized exhaust pipe (901) is connected to the pressurized pipeline (902) between the third pressure regulating valve and the liquefied petroleum gas storage tank (1) near the third pressure regulating valve, and the other end is connected to the exhaust pipeline (8) through the fourteenth ball valve, the third angle spring safety valve, and the fifteenth ball valve which are arranged in sequence.

9. The improved liquefied petroleum gas station according to claim 1, characterized in that: The fire protection system (10) comprises a cooling water pipeline (1001) and a nozzle pipe group (1002); One end of the cooling water pipeline (1001) is connected to the fire water network, and the other end is connected to the fire water interface of the liquefied petroleum gas storage tank (1). At the end close to the liquefied petroleum gas storage tank (1), a sixteenth ball valve, a fifth hose, a water injection pump, a sixth hose, and a seventeenth ball valve are sequentially provided from the fire water network to the liquefied petroleum gas storage tank (1); One end of the nozzle pipe group (1002) is connected to the fire water pipe network, and the other end extends to the top of each liquefied petroleum gas storage tank (1), and a nozzle group consisting of a plurality of nozzles is provided at a position corresponding to each liquefied petroleum gas storage tank (1); the nozzle pipe group (1002) is provided with an eighteenth ball valve and a fourth pressure regulating valve in sequence from the fire water pipe network to the nozzle group near the nozzle group.

10. The improved liquefied petroleum gas station according to claim 1, characterized in that: The LPG back pressure system (11) comprises: a back pressure main pipe (1101) having one end connected to the LPG back pressure receiving end of the liquefied petroleum gas storage tank (1) and the other end connected to the LPG output system (3); the back pressure main pipe (1101) is provided with a diaphragm valve and a nineteenth ball valve in sequence from the LPG output system (3) to the liquefied petroleum gas storage tank (1) near the LPG output system (3).

Images