CN112628604A - Multifunctional liquefied hydrocarbon spherical tank system and control method - Google Patents
Multifunctional liquefied hydrocarbon spherical tank system and control method Download PDFInfo
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- CN112628604A CN112628604A CN202010936511.XA CN202010936511A CN112628604A CN 112628604 A CN112628604 A CN 112628604A CN 202010936511 A CN202010936511 A CN 202010936511A CN 112628604 A CN112628604 A CN 112628604A
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 59
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 59
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 239000007791 liquid phase Substances 0.000 claims abstract description 58
- 230000018044 dehydration Effects 0.000 claims abstract description 42
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 42
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 239000012071 phase Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 53
- 239000000463 material Substances 0.000 claims description 30
- 238000011144 upstream manufacturing Methods 0.000 claims description 21
- 230000005484 gravity Effects 0.000 claims description 14
- 239000002699 waste material Substances 0.000 claims description 7
- 238000002309 gasification Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 239000007792 gaseous phase Substances 0.000 claims description 2
- 239000010865 sewage Substances 0.000 abstract description 8
- 208000005156 Dehydration Diseases 0.000 description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 9
- 238000007599 discharging Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 206010016754 Flashback Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a multifunctional liquefied hydrocarbon spherical tank system which comprises a full-pressure storage tank for storing liquefied hydrocarbon, a gasifier and a dehydration tank, wherein the top of the full-pressure storage tank is provided with a gas-phase backflow port, and the bottom of the full-pressure storage tank is provided with a first liquid-phase output port and a second liquid-phase output port. The liquefied hydrocarbon spherical tank system integrates the functions of water cutting, pressure regulation, discharge and conveying, simplifies the integral structure of the original system, and reduces potential risks in the running process of the liquefied hydrocarbon spherical tank system by switching and operating different functions of one set of flow; in the water cutting process, liquid in the full-pressure storage tank is gasified through the gasifier, gas-liquid separation is achieved in the pipeline, the liquid after the gas-liquid separation enters the dehydration tank, secondary separation is conducted in the tank, the gas phase returns to the top of the gasifier, the liquid phase is sent out through the liquid level valve, the whole process is safe and reliable, liquefied hydrocarbon in the dehydration process is completely removed, and potential safety hazards in the sewage sending-out or operation process are reduced.
Description
Technical Field
The invention relates to the technical field of liquefied hydrocarbon storage equipment, in particular to a multifunctional liquefied hydrocarbon spherical tank system and a control method.
Background
In petrochemical enterprises, a full-pressure spherical tank is one of the most common storage devices for liquefied hydrocarbon, and the liquefied hydrocarbon is a flammable and explosive medium, so that the importance of ensuring the safe operation of the spherical tank is high. At present, a water cutting system, a conveying system, a vacuum breaking system and a discharging system of the spherical tank are respectively and independently arranged, and the specific arrangement mode is as follows:
(1) water cutting system
At present, the spherical tank water cutting modes include manual water cutting and automatic water cutting. The manual water cutting is generally carried out by adopting a secondary dehydration system, a water cutting pipeline is led out from the lowest part of the spherical tank and enters the dehydration tank, the design pressure of the dehydration tank is the same as that of the spherical tank, the dehydration tank adopts steam heat tracing so as to prevent freezing, liquefied hydrocarbon brought out in the water cutting process is gasified and discharged to a torch system, and the sewage of the liquefied hydrocarbon gas is removed and sent out. The automatic water cutting is generally realized by the density difference between liquefied hydrocarbon and water through the principles of floating balls, levers and the like or through an automatic control instrument. For example, an automatic water-cutting device for liquefied hydrocarbon tank, an automatic water-cutting device for oil tank (No. CN205216278U), an automatic dewatering device for liquid hydrocarbon in oil product (No. CN2456801Y), an automatic water-cutting device for oil tank container (No. CN2372282Y), a safety device for dewatering spherical tank and a dewatering device for spherical tank (No. CN108753350A) are disclosed.
(2) Conveying system
At present, the gasifier is used for pressurizing the spherical tank to realize unpowered conveying of liquefied hydrocarbon, which is one of common and mature technologies, and the gasifier is used for gasifying the liquefied hydrocarbon to pressurize and convey the spherical tank, so that the requirements of downstream users are met.
(3) Vacuum breaking system
When the temperature is reduced to a certain degree in winter and the pressure of liquefied hydrocarbon steam is lower than the atmospheric pressure, the spherical tank is in a vacuum state, and in order to prevent fire or explosion accidents caused by air entering, the vacuum needs to be broken, and the positive pressure of the storage tank needs to be maintained. The current common method is to arrange a nitrogen sealing system to supplement nitrogen to prevent the vacuum of the spherical tank. However, the supplemented nitrogen gas is finally discharged, which causes material waste and increases energy consumption.
(4) Relief system
According to the relevant national standards and relevant regulatory provisions, the spherical tanks are provided with at least 2 safety valves and 1 emergency vent line. Once the spherical tank is over-pressurized, the safety valve jumps or the emergency emptying valve is opened to meet the pressure relief requirement. During the operation of the spherical tank, if the spherical tank is in overpressure caused by improper operation (non-fire working condition), a safety valve at the top of the spherical tank jumps when the spherical tank is in overpressure, and a large amount of liquefied hydrocarbon is discharged to a torch, so that a large amount of liquefied hydrocarbon is wasted. And the temperature will decrease from the higher pressure to the lower pressure of the flare system during the discharge of the liquefied hydrocarbon gas, which may cause the risk of flashback due to the vacuum of the flare system.
In the prior art, all the systems are independently arranged, only the functions of water cutting or pressurization conveying can be realized, and some potential safety hazards exist in part of the operation process. For example, a manual water cutting system is simple, liquefied hydrocarbon brought out in the water cutting process cannot be completely discharged from a dehydration tank, and the outward delivery of sewage containing the liquefied hydrocarbon causes great potential safety hazard and even safety accidents; the automatic water cutting structure is complex, the investment is large, the fault is easy, and the maintenance cost is high. Although the nitrogen sealing system can meet the requirement of maintaining positive pressure of the spherical tank, the nitrogen sealing system has the defects of material waste, high energy consumption and the like. The bleed system, while safe, can result in a large discharge of liquefied hydrocarbons to the flare, resulting in wasted material.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a multifunctional liquefied hydrocarbon spherical tank system which is simple and reasonable in structure, integrates water cutting, pressure regulation, discharge and conveying into a whole, and can balance the pressure in the tank and improve the safety performance at a lower cost.
The second technical problem to be solved by the present invention is to provide a method for controlling the multifunctional liquefied hydrocarbon spherical tank system in view of the current state of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a multi-functional liquefied hydrocarbon spherical tank system, includes the full pressure type storage tank that is used for depositing liquefied hydrocarbon, and the top of this full pressure type storage tank has gaseous phase backward flow mouth, bottom and has first liquid phase delivery outlet and second liquid phase delivery outlet, its characterized in that: also comprises
The gasifier is provided with a gas phase output port at the top and a liquid phase input port and a liquid phase output port at the bottom, the gas phase output port is connected with a gas phase return port of the full-pressure storage tank through a first pipeline, and the first pipeline is provided with a valve; the liquid phase input port is connected with a first liquid phase output port of the full-pressure storage tank through a second pipeline;
the first end of the third pipeline is connected with the first pipeline, and the second end of the third pipeline is connected with a torch; the liquid phase output port of the gasifier is connected with the third pipeline through a fourth pipeline, and a valve is arranged on the fourth pipeline;
a fifth pipeline, the first end of which is connected with the second liquid phase output port of the full-pressure storage tank, and is used for sending out the liquid phase in the full-pressure storage tank;
the top of the dehydration tank is provided with an input port and a gas phase output port, the bottom of the dehydration tank is provided with a liquid phase output port, the input port is connected with the fourth pipeline through a sixth pipeline, and the sixth pipeline is provided with a valve; the gas phase output port is connected with the third pipeline through a seventh pipeline, and a valve is arranged on the seventh pipeline;
the first end of the eighth pipeline is connected with the upstream of the fourth pipeline, and a valve is arranged on the eighth pipeline; and the liquid phase output port of the dewatering tank is connected with an eighth pipeline through a ninth pipeline, and a valve is arranged on the ninth pipeline.
Preferably, the dewatering tank is provided with a pressure detector and a temperature detector, the ninth pipeline is provided with a liquid level valve, and the dewatering tank is provided with a liquid level detector in electrical signal connection with the liquid level valve. So as to control the pressure and temperature of the dewatering tank and the whole system in real time and operate according to the set parameters.
Further preferably, the dewatering tank is also provided with a glass plate liquid level meter which can measure the liquid level in real time and is used for checking the data of the liquid level detector. After the device is used for a long time, the system parameters are calibrated by using the structure, so that the safety performance and the operation precision are improved.
In the invention, under the condition that the pressure of a downstream user is lower than the design pressure of the full-pressure type storage tank, the fifth pipeline is not provided with a power pump; and a horizontal pump is arranged on the fifth pipeline under the condition that the pressure of a downstream user is higher than the design pressure of the full-pressure type storage tank. When the pressure of a downstream user is higher than the design pressure of the storage tank, the conveying pump must be installed, but because the gasifier is used for pressurization, the conveying pump can be a common horizontal pump, a barrel pump which is expensive and inconvenient to operate and maintain is not needed, the investment is saved, the maintenance cost is reduced, and the safety risk is reduced.
Preferably, the bottom of the full-pressure storage tank is further provided with a third liquid-phase output port, the third liquid-phase output port is connected with the second pipeline through a tenth pipeline, and the tenth pipeline is provided with a valve.
In each of the above solutions, the first pipe is provided with a valve 7 located upstream and a valve 8 located downstream;
the connection position of the third pipeline and the first pipeline is positioned at the upstream of the valve 7, and the third pipeline is provided with a valve 14 positioned at the upstream and a valve 13 positioned at the downstream;
the connection between the fourth pipeline and the third pipeline is positioned between the valve 14 and the valve 13, and the fourth pipeline is provided with the upstream valve 4;
the joint of the eighth pipeline and the fourth pipeline is positioned at the downstream of the valve 4, and the eighth pipeline is provided with a valve 6;
the joint of the ninth pipeline and the eighth pipeline is positioned at the downstream of the valve 6, and the ninth pipeline is provided with a valve 9;
the joint of the sixth pipeline and the fourth pipeline is positioned at the downstream of the joint of the eighth pipeline and the fourth pipeline, and the sixth pipeline is provided with a valve 5;
the connection position of the seventh pipeline and the third pipeline is positioned at the downstream of the connection position of the fourth pipeline and the third pipeline and at the upstream of the valve 13, and the seventh pipeline is provided with a valve 10;
the second pipeline is provided with a valve 1 positioned at the upstream and a valve 3 positioned at the downstream;
the joint of the tenth pipeline and the second pipeline is positioned between the valve 1 and the valve 3, and the tenth pipeline is provided with a valve 2.
The control method of the multifunctional liquefied hydrocarbon spherical tank system is characterized by comprising the following steps:
(1) cutting water
Filling a full-pressure storage tank to a designed liquid level, starting a water cutting process after settling, allowing a liquid-phase material to enter a gasifier through a valve 1 and a valve 3 for gasification, allowing a gas-phase material obtained in the gasifier to flow back to the full-pressure storage tank through a valve 7 and a valve 8, allowing the liquid-phase material obtained in the gasifier to enter a dehydration tank through the valve 4 and the valve 5, arranging a vertical expanding pipe section Q on a pipeline where the valve 4 and the valve 5 are arranged, determining the pipe diameter of the expanding pipe section Q through calculation according to the designed flow, controlling the flow rate to be 0.8 m/s, allowing the length L1 of the expanding pipe section to be 3-3.5 m, leading out the pipeline where the valve 5 is arranged from the upper part of the expanding pipe section Q, leading out a connecting point which is higher than the elevation of an upper end socket flange of the gasifier B, allowing the liquid to have a large gravity due to different specific weights of gas and liquid, generating a downward speed while the gas still moves upward, and settling through the gravity at a lower flow rate, thus, gas and liquid in the expanding pipe section Q are completely separated, the liquid after gas and liquid separation enters a dehydration tank, gas phase materials obtained in the dehydration tank return to the top of the gasifier through a valve 10 and a valve 14, and liquid phase materials obtained in the dehydration tank are sent out through a liquid level valve through a valve 9.
The process is safe and reliable, the liquefied hydrocarbon is completely removed in the dehydration process, and the potential safety hazard in the sewage delivery or operation process is reduced;
(2) pressure boost
Under the normal operation condition, liquid phase materials enter a gasifier through a valve 2 or a valve 1 and a valve 3, gasified gas in the gasifier enters a full-pressure storage tank through a valve 7 and a valve 8, and the full-pressure storage tank is pressurized to meet the pressure requirement of conveying the materials to downstream users;
the process is simple and easy to operate, an external air source is not needed to be supplemented, and a delivery pump is not needed when the pressure of a downstream user is lower than the design pressure of the storage tank (when the pressure of the downstream user is higher than the design pressure of the storage tank, the delivery pump is installed, but because of the pressurization of the gasifier, the delivery pump can be a common horizontal pump, a barrel pump which is expensive and inconvenient to operate and maintain is not needed, the investment is saved, the maintenance cost is reduced, and the safety risk is reduced);
(3) breaking vacuum
After the temperature is reduced to the set temperature in winter, when the pressure of the liquefied hydrocarbon steam is lower than the atmospheric pressure, starting the pressurization process of the step (2), so that the positive pressure is maintained in the full-pressure storage tank, and air is prevented from entering;
(4) pressure relief
The full-pressure storage tank is manually decompressed, gas in the full-pressure storage tank enters the gasifier through the valve 8 and the valve 7 and then is discharged to the torch system through the valve 4 and the valve 13, waste of liquefied hydrocarbon is reduced, and safety of the torch system is guaranteed.
When the pressure of the spherical tank rises to be close to the set pressure of the spherical tank safety valve due to improper operation (non-fire working condition), in order to avoid the waste of a large amount of liquefied hydrocarbon caused by the jumping of the safety valve, a manual pressure relief flow is started, gas in the spherical tank enters a gasifier through a valve 8 and a valve 7, and then is discharged to a torch system through a valve 4 and a valve 13; the temperature can be reduced along with the higher pressure discharged to the lower pressure of the torch system in the liquefied hydrocarbon gas discharging process, the danger of backfire caused by vacuum of the torch system can be caused, and the danger is avoided through the manual pressure discharging process of the invention when the gas is heated by the gasifier and then discharged into the torch system.
Preferably, (1) in the water cutting process, a section of vertical expanded diameter pipe section is arranged on a pipeline where the valve 4 and the valve 5 are located, the pipe diameter of the expanded diameter pipe section is determined by calculation according to the design flow, the flow rate is controlled to be 0.8 m/s, the length of the expanded diameter pipe section is 3-3.5 m, the pipeline where the valve 5 is located is led out from the upper part of the expanded diameter pipe section, the height of a leading-out point connecting pipe is higher than the elevation of a flange of an upper end enclosure of a gasifier, the gravity borne by liquid is larger due to different specific gravity of gas and liquid, a downward speed is generated, the gas still moves upwards, and the gas and the liquid are completely separated in the expanded diameter pipe section through gravity settling at the lower flow rate. The liquid after gas-liquid separation enters a dehydration tank, the gas phase material obtained in the dehydration tank returns to the top of the gasifier through a valve 10 and a valve 14, and the liquid phase material obtained in the dehydration tank is delivered out through a liquid level valve through a valve 9.
The process is safe and reliable, the liquefied hydrocarbon is completely removed in the dehydration process, and the potential safety hazard in the sewage delivery or operation process is reduced.
Compared with the prior art, the invention has the advantages that: the liquefied hydrocarbon spherical tank system integrates the functions of water cutting, pressure regulation, discharge and conveying, simplifies the integral structure of the original system, and reduces potential risks in the running process of the liquefied hydrocarbon spherical tank system by switching and operating different functions of one set of flow; in the water cutting process, liquid in the full-pressure storage tank is gasified through the gasifier, gas-liquid separation is achieved in the pipeline, the liquid after the gas-liquid separation enters the dehydration tank, secondary separation is conducted in the tank, the gas phase returns to the top of the gasifier, the liquid phase is sent out through the liquid level valve, the whole process is safe and reliable, liquefied hydrocarbon in the dehydration process is completely removed, and potential safety hazards in the sewage sending-out or operation process are reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is an enlarged view of the expanded diameter section of fig. 1.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 and 2, the multifunctional liquefied hydrocarbon spherical tank system of the present embodiment includes a full-pressure storage tank a for storing liquefied hydrocarbon, where the full-pressure storage tank a has a gas phase reflux port at the top and a first liquid phase output port and a second liquid phase output port at the bottom. The multifunctional liquefied hydrocarbon spherical tank system of the embodiment further comprises:
the top of the gasifier B is provided with a gas phase output port, the bottom of the gasifier B is provided with a liquid phase input port and a liquid phase output port, the gas phase output port is connected with a gas phase return port of the full-pressure storage tank A through a first pipeline B1, and a valve is arranged on the first pipeline B1; the liquid phase input port is connected with a first liquid phase output port of the full-pressure storage tank A through a second pipeline B2;
a third pipeline C, the first end of which is connected with the first pipeline B1, and the second end of which is connected with a torch; the liquid phase output port of the gasifier B is connected with the third pipeline C through a fourth pipeline D, and a valve is arranged on the fourth pipeline D;
a fifth pipeline E, the first end of which is connected with the second liquid phase output port of the full-pressure storage tank A and is used for sending out the liquid phase in the full-pressure storage tank A;
the top of the dehydration tank F is provided with an input port and a gas phase output port, the bottom of the dehydration tank F is provided with a liquid phase output port, the input port is connected with a fourth pipeline D through a sixth pipeline G, and the sixth pipeline G is provided with a valve; the gas phase output port is connected with a third pipeline C through a seventh pipeline H, and a valve is arranged on the seventh pipeline H;
the first end of the eighth pipeline I is connected with the upstream of the fourth pipeline D, and a valve is arranged on the eighth pipeline I; and a liquid phase output port of the dewatering tank F is connected with the eighth pipeline I through a ninth pipeline J, and a valve is arranged on the ninth pipeline J.
The dewatering tank F is provided with a pressure detector and a temperature detector, the ninth pipeline J is provided with a liquid level valve J1, and the dewatering tank F is provided with a liquid level detector electrically connected with the liquid level valve J1. So as to control the pressure and temperature of the dewatering tank and the whole system in real time and operate according to the set parameters. And a glass plate liquid level meter which can measure the liquid level in real time and is used for checking the data of the liquid level detector is also arranged on the dehydration tank F. After the device is used for a long time, the system parameters are calibrated by using the structure, so that the safety performance and the operation precision are improved.
In the embodiment, under the condition that the pressure of a downstream user is lower than the design pressure of the full-pressure type storage tank A, the fifth pipeline E is not provided with a power pump; and a horizontal pump K is arranged on the fifth pipeline E under the condition that the pressure of a downstream user is higher than the design pressure of the full-pressure type storage tank A. When the pressure of a downstream user is higher than the design pressure of the storage tank, the conveying pump must be installed, but because the gasifier is used for pressurization, the conveying pump can be a common horizontal pump, a barrel pump which is expensive and inconvenient to operate and maintain is not needed, the investment is saved, the maintenance cost is reduced, and the safety risk is reduced.
The bottom of the above-mentioned full pressure type storage tank a is also provided with a third liquid phase output port, and this third liquid phase output port is connected with second pipeline B2 through tenth pipeline L, and is provided with the valve on this tenth pipeline L.
In the present embodiment, the first conduit B1 is provided with the upstream valve 7 and the downstream valve 8;
the junction of the third pipeline C and the first pipeline B1 is positioned upstream of the valve 7, and the third pipeline C is provided with a valve 14 positioned upstream and a valve 13 positioned downstream;
the joint of the fourth pipeline D and the third pipeline C is positioned between the valve 14 and the valve 13, and the fourth pipeline D is provided with a valve 4 positioned at the upstream;
the joint of the eighth pipeline I and the fourth pipeline D is positioned at the downstream of the valve 4, and the eighth pipeline I is provided with a valve 6;
the joint of the ninth pipeline J and the eighth pipeline I is positioned at the downstream of the valve 6, and the ninth pipeline J is provided with a valve 9;
the joint of the sixth pipeline G and the fourth pipeline D is positioned at the downstream of the joint of the eighth pipeline I and the fourth pipeline D, and the sixth pipeline G is provided with a valve 5;
the connection position of the seventh pipeline H and the third pipeline C is positioned at the downstream of the connection position of the fourth pipeline D and the third pipeline C and at the upstream of the valve 13, and the seventh pipeline H is provided with a valve 10;
the second pipeline B2 is provided with a valve 1 positioned at the upstream and a valve 3 positioned at the downstream;
the connection between the tenth pipe L and the second pipe B2 is between the valves 1 and 3, and the tenth pipe L is provided with a valve 2.
The control method of the multifunctional liquefied hydrocarbon spherical tank system comprises the following steps:
(1) cutting water
Filling a full-pressure storage tank to a designed liquid level, starting a water cutting process after sedimentation, allowing a liquid-phase material to enter a gasifier through a valve 1 and a valve 3 for gasification, allowing a gas-phase material obtained from the gasifier to flow back to the full-pressure storage tank through a valve 7 and a valve 8, allowing the liquid-phase material obtained from the gasifier to enter a dehydration tank through the valve 4 and the valve 5, arranging a vertical expanding pipe section Q on a pipeline where the valve 4 and the valve 5 are located, determining the pipe diameter of the expanding pipe section through calculation according to the designed flow, controlling the flow rate to be 0.8 m/s, controlling the length L1 of the expanding pipe section Q to be 3-3.5 m, leading out the pipeline where the valve 5 is located from the upper part of the expanding pipe section Q, and marking the height of a leading-out point to be higher than the height delta H at the upper end socket of the gasifier B, wherein the height difference. Because the specific gravity of the gas and the liquid is different, the liquid is subjected to higher gravity, a downward speed is generated, the gas still moves upwards, the gas and the liquid are completely separated in the expanding tube section through gravity settling at a lower flow speed, the liquid after the gas and the liquid are separated enters a dehydration tank, a gas phase material obtained in the dehydration tank returns to the top of the gasifier through a valve 10 and a valve 14, and a liquid phase material obtained in the dehydration tank is sent out through a liquid level valve through a valve 9.
The process is safe and reliable, the liquefied hydrocarbon is completely removed in the dehydration process, and the potential safety hazard in the sewage delivery or operation process is reduced;
(2) pressure boost
Under the normal operation condition, liquid phase materials enter a gasifier through a valve 2 or a valve 1 and a valve 3, gasified gas in the gasifier enters a full-pressure storage tank through a valve 7 and a valve 8, and the full-pressure storage tank is pressurized to meet the pressure requirement of conveying the materials to downstream users;
the process is simple and easy to operate, an external air source is not needed to be supplemented, and a delivery pump is not needed when the pressure of a downstream user is lower than the design pressure of the storage tank (when the pressure of the downstream user is higher than the design pressure of the storage tank, the delivery pump is installed, but because of the pressurization of the gasifier, the delivery pump can be a common horizontal pump, a barrel pump which is expensive and inconvenient to operate and maintain is not needed, the investment is saved, the maintenance cost is reduced, and the safety risk is reduced);
(3) breaking vacuum
After the temperature is reduced to the set temperature in winter, when the pressure of the liquefied hydrocarbon steam is lower than the atmospheric pressure, starting the pressurization process of the step (2), so that the positive pressure is maintained in the full-pressure storage tank, and air is prevented from entering;
(4) pressure relief
The full-pressure storage tank is manually decompressed, gas in the full-pressure storage tank enters the gasifier through the valve 8 and the valve 7 and then is discharged to the torch system through the valve 4 and the valve 13, waste of liquefied hydrocarbon is reduced, and safety of the torch system is guaranteed.
When the pressure of the spherical tank rises to be close to the set pressure of the spherical tank safety valve due to improper operation (non-fire working condition), in order to avoid the waste of a large amount of liquefied hydrocarbon caused by the jumping of the safety valve, a manual pressure relief flow is started, gas in the spherical tank enters a gasifier through a valve 8 and a valve 7, and then is discharged to a torch system through a valve 4 and a valve 13; the temperature can be reduced along with the higher pressure discharged to the lower pressure of the torch system in the liquefied hydrocarbon gas discharging process, the danger of backfire caused by vacuum of the torch system can be caused, and the danger is avoided through the manual pressure discharging process of the invention when the gas is heated by the gasifier and then discharged into the torch system.
Preferably, (1) in the water cutting process, a section of vertical expanded diameter pipe section is arranged on a pipeline where the valve 4 and the valve 5 are located, the pipe diameter of the expanded diameter pipe section is determined by calculation according to the design flow, the flow rate is controlled to be 0.8 m/s, the length of the expanded diameter pipe section is 3-3.5 m, the pipeline where the valve 5 is located is led out from the upper part of the expanded diameter pipe section, the height of a leading-out point connecting pipe is higher than the elevation of a flange of an upper end enclosure of a gasifier, the gravity borne by liquid is larger due to different specific gravity of gas and liquid, a downward speed is generated, the gas still moves upwards, and the gas and the liquid are completely separated in the expanded diameter pipe section through gravity settling at the lower flow rate. The liquid after gas-liquid separation enters a dehydration tank, the gas phase material obtained in the dehydration tank returns to the top of the gasifier through a valve 10 and a valve 14, and the liquid phase material obtained in the dehydration tank is delivered out through a liquid level valve through a valve 9.
The process is safe and reliable, the liquefied hydrocarbon is completely removed in the dehydration process, and the potential safety hazard in the sewage delivery or operation process is reduced.
Claims (8)
1. The utility model provides a multi-functional liquefied hydrocarbon spherical tank system, includes the full pressure type storage tank that is used for depositing liquefied hydrocarbon, and the top of this full pressure type storage tank has gaseous phase backward flow mouth, bottom and has first liquid phase delivery outlet and second liquid phase delivery outlet, its characterized in that: also comprises
The gasifier is provided with a gas phase output port at the top and a liquid phase input port and a liquid phase output port at the bottom, the gas phase output port is connected with a gas phase return port of the full-pressure storage tank through a first pipeline, and the first pipeline is provided with a valve; the liquid phase input port is connected with a first liquid phase output port of the full-pressure storage tank through a second pipeline;
the first end of the third pipeline is connected with the first pipeline, and the second end of the third pipeline is connected with a torch; the liquid phase output port of the gasifier is connected with the third pipeline through a fourth pipeline, and a valve is arranged on the fourth pipeline;
a fifth pipeline, the first end of which is connected with the second liquid phase output port of the full-pressure storage tank, and is used for sending out the liquid phase in the full-pressure storage tank;
the top of the dehydration tank is provided with an input port and a gas phase output port, the bottom of the dehydration tank is provided with a liquid phase output port, the input port is connected with the fourth pipeline through a sixth pipeline, and the sixth pipeline is provided with a valve; the gas phase output port is connected with the third pipeline through a seventh pipeline, and a valve is arranged on the seventh pipeline; and
the first end of the eighth pipeline is connected with the upstream of the fourth pipeline, and a valve is arranged on the eighth pipeline; and the liquid phase output port of the dewatering tank is connected with an eighth pipeline through a ninth pipeline, and a valve is arranged on the ninth pipeline.
2. The multifunctional liquefied hydrocarbon spherical tank system according to claim 1, wherein: the dewatering tank is provided with a pressure detector and a temperature detector, the ninth pipeline is provided with a liquid level valve, and the dewatering tank is provided with a liquid level detector electrically connected with the liquid level valve.
3. The multifunctional liquefied hydrocarbon spherical tank system according to claim 2, wherein: and the dewatering tank is also provided with a glass plate liquid level meter which can measure the liquid level in real time and is used for checking the data of the liquid level detector.
4. The multifunctional liquefied hydrocarbon spherical tank system according to claim 1, wherein: under the condition that the pressure of a downstream user is lower than the design pressure of the full-pressure type storage tank, the fifth pipeline is not provided with a power pump; and a horizontal pump is arranged on the fifth pipeline under the condition that the pressure of a downstream user is higher than the design pressure of the full-pressure type storage tank.
5. The multifunctional liquefied hydrocarbon spherical tank system according to any one of claims 1 to 4, wherein: the bottom of the full-pressure storage tank is also provided with a third liquid phase output port, the third liquid phase output port is connected with the second pipeline through a tenth pipeline, and the tenth pipeline is provided with a valve.
6. The multifunctional liquefied hydrocarbon spherical tank system according to claim 5, wherein: the first pipeline is provided with a valve 7 positioned at the upstream and a valve 8 positioned at the downstream;
the connection position of the third pipeline and the first pipeline is positioned at the upstream of the valve 7, and the third pipeline is provided with a valve 14 positioned at the upstream and a valve 13 positioned at the downstream;
the connection between the fourth pipeline and the third pipeline is positioned between the valve 14 and the valve 13, and the fourth pipeline is provided with the upstream valve 4;
the joint of the eighth pipeline and the fourth pipeline is positioned at the downstream of the valve 4, and the eighth pipeline is provided with a valve 6;
the joint of the ninth pipeline and the eighth pipeline is positioned at the downstream of the valve 6, and the ninth pipeline is provided with a valve 9;
the joint of the sixth pipeline and the fourth pipeline is positioned at the downstream of the joint of the eighth pipeline and the fourth pipeline, and the sixth pipeline is provided with a valve 5;
the connection position of the seventh pipeline and the third pipeline is positioned at the downstream of the connection position of the fourth pipeline and the third pipeline and at the upstream of the valve 13, and the seventh pipeline is provided with a valve 10;
the second pipeline is provided with a valve 1 positioned at the upstream and a valve 3 positioned at the downstream;
the joint of the tenth pipeline and the second pipeline is positioned between the valve 1 and the valve 3, and the tenth pipeline is provided with a valve 2.
7. A method for controlling the multifunctional liquefied hydrocarbon spherical tank system as claimed in claim 6, wherein:
(1) cutting water
Filling the full-pressure storage tank to a designed liquid level, starting a water cutting process after settling, allowing a liquid-phase material to enter a gasifier through a valve 1 and a valve 3 for gasification, allowing a gas-phase material obtained in the gasifier to flow back to the full-pressure storage tank through a valve 7 and a valve 8, allowing the liquid-phase material obtained in the gasifier to enter a dehydration tank through a valve 4 and a valve 5, further realizing complete gas-liquid separation in a pipeline where the valve 4 and the valve 5 are located, allowing the liquid after gas-liquid separation to enter the dehydration tank, allowing the gas-phase material obtained in the dehydration tank to return to the top of the gasifier through a valve 10 and a valve 14, and allowing the liquid-phase material obtained in the dehydration tank to be delivered out through a liquid level valve through a valve;
(2) pressure boost
Under the normal operation condition, liquid phase materials enter a gasifier through a valve 2 or a valve 1 and a valve 3, gasified gas in the gasifier enters a full-pressure storage tank through a valve 7 and a valve 8, and the full-pressure storage tank is pressurized to meet the pressure requirement of conveying the materials to downstream users;
(3) breaking vacuum
After the temperature is reduced to the set temperature in winter, when the pressure of the liquefied hydrocarbon steam is lower than the atmospheric pressure, starting the pressurization process of the step (2), so that the positive pressure is maintained in the full-pressure storage tank, and air is prevented from entering;
(4) pressure relief
The full-pressure storage tank is manually decompressed, gas in the full-pressure storage tank enters the gasifier through the valve 8 and the valve 7 and then is discharged to the torch system through the valve 4 and the valve 13, waste of liquefied hydrocarbon is reduced, and safety of the torch system is guaranteed.
8. The control method according to claim 7, characterized in that: (1) in the water cutting process, a section of vertical expanding pipe section is arranged on a pipeline where the valves 4 and 5 are located, the flow velocity in the expanding pipe section is controlled to be 0.8 m/s, the length of the expanding pipe section is 3-3.5 m, the pipeline where the valve 5 is located is led out from the upper portion of the expanding pipe section, the height mark of a leading-out point is higher than the elevation of a flange of an upper end enclosure of the gasifier, due to the fact that the specific gravity of gas and liquid is different, the gravity of the liquid is large, a downward speed is generated, the gas still moves upwards, the gas and the liquid are completely separated in the expanding pipe section through gravity settling at a low flow velocity, the liquid after gas and liquid separation enters a dehydration tank, gas-phase materials obtained in the dehydration tank return to the top of the gasifier through the valves 10 and 14, and liquid-phase materials obtained in the dehydration tank are sent out through the liquid level valve.
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Application publication date: 20210409 |