CN115259067A - Pressure relief device for road tank truck unloading facility and use method thereof - Google Patents
Pressure relief device for road tank truck unloading facility and use method thereof Download PDFInfo
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- CN115259067A CN115259067A CN202211082173.3A CN202211082173A CN115259067A CN 115259067 A CN115259067 A CN 115259067A CN 202211082173 A CN202211082173 A CN 202211082173A CN 115259067 A CN115259067 A CN 115259067A
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- liquid material
- pressure
- elastic membrane
- pressure relief
- relief device
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011344 liquid material Substances 0.000 claims abstract description 146
- 239000012528 membrane Substances 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims description 39
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000001273 butane Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 4
- 239000003502 gasoline Substances 0.000 claims description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001294 propane Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 229920000459 Nitrile rubber Polymers 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- 229920001973 fluoroelastomer Polymers 0.000 claims 1
- 239000003921 oil Substances 0.000 claims 1
- 229920003225 polyurethane elastomer Polymers 0.000 claims 1
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/78—Arrangements of storage tanks, reservoirs or pipe-lines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/42—Filling nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/58—Arrangements of pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/76—Arrangements of devices for purifying liquids to be transferred, e.g. of filters, of air or water separators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
The invention discloses a pressure relief device for an unloading facility of a road tank truck and a using method thereof. The pressure relief device comprises a pressure relief device (7), and the pressure relief device (7) is provided with a pressure relief device shell. An elastic membrane (21) is arranged in the inner cavity of the pressure relief device shell, the elastic membrane (21) divides the inner cavity of the pressure relief device shell into a liquid material chamber (19) and an air chamber (18), and the liquid material chamber (19) is positioned below the air chamber (18). The liquid material chamber (19) is connected with a pipe section of a pump outlet pipeline of a loading pump of a loading facility of the road tank car, which is positioned between the outlet of the numerical control valve and the inlet of a lower loading arm, through a pressure balance pipeline (15). The invention discloses a use method of a pressure relief device of a road tank truck loading facility. The invention is mainly used in the road tank car loading facilities of petrochemical plants and reservoir areas.
Description
Technical Field
The invention belongs to the technical field of storage and transportation of liquid oil products, liquefied petroleum gas or chemical products in the petrochemical industry, and relates to a pressure relief device of a road tank truck loading facility and a use method thereof.
Background
Transportation by road tank trucks is one of the main delivery modes of petrochemical liquid materials such as gasoline, diesel oil, liquefied petroleum gas and the like. With the increasing awareness of environmental protection, in order to realize organized collection and treatment of volatile organic compounds, the loading mode of highway tank trucks such as gasoline and diesel oil is changed from top loading to bottom loading, and a dry quick coupling (also called a dry separation valve) which is the same as a liquefied petroleum gas loading arm is adopted for a bottom loading arm, so that the dry quick coupling can effectively avoid leakage of liquid materials when the bottom loading arm is separated from the tank truck. When the loading amount of the liquid material reaches the loading amount set by the flowmeter, the flowmeter controls to close the numerical control valve through a signal line, and then the dry type quick connector of the lower loading arm is separated from the dry type quick connector on the road tank car manually. In order to meet the fairness and justness of trade handover, the numerical control valve behind the outlet of the flow meter is always in a closed state until the next time of loading, so as to ensure that no liquid material flows in the flow meter; that is to say, the pipeline between the outlet of the numerical control valve and the dry quick coupling of the lower loading arm is always in a closed state when the loading operation is not carried out. The high ambient temperature in summer or the long-time solarization in other seasons can cause the temperature and the pressure of the liquid material in the closed pipeline between the outlet of the numerical control valve and the dry quick connector of the lower loading arm to rise and the volume to expand. When the pressure relief measure is not taken on the closed pipeline by the road tank car unloading facility, the following problems exist: the sealing rubber ring at the connecting part of the outlet of the lower loading arm and the dry-type quick connector, the sealing rubber ring at the upper rotating part of the lower loading arm, the sealing gasket of the upper flange of the lower loading arm and the like have liquid material leakage, so that the possibility of accumulating explosive gas in a loading area is increased, and potential safety hazard exists.
In order to solve the problems, some existing road tank truck installations use a second safety valve or a check valve to relieve the pressure of the closed pipeline. The inlet of the second safety valve or the check valve is communicated with a pipe section of the outlet pipeline of the loading pump, which is positioned between the outlet of the numerical control valve and the inlet of the lower loading arm, through a pipeline, and the outlet of the second safety valve or the check valve is communicated with a pipe section of the outlet pipeline of the loading pump, which is positioned between the outlet of the outlet valve of the loading pump and the inlet of the flowmeter through a pipeline. The road tank car unloading facility is also provided with a first safety valve, the inlet of the first safety valve is communicated with the pipe section of the pump outlet pipeline of the loading pump, which is positioned between the outlet of the outlet valve of the loading pump and the inlet of the flowmeter, through a pipeline, and the outlet of the first safety valve is communicated with the pipe section of the pump inlet pipeline of the loading pump, which is positioned between the outlet of the tank root valve and the inlet of the inlet valve of the loading pump, through a pipeline. When the second safety valve or the check valve is used for pressure relief, the over-pressure liquid material is released to the storage tank through the second safety valve (or the check valve) and the first safety valve, and a seller easily performs repeated metering and cheating on the pressure-relieved liquid material. After pressure relief, if a closed pipeline between an outlet of the numerical control valve and a dry type quick coupling of a lower loading arm is subjected to temperature drop and vacuum occurs, opening difficulties of the numerical control valve and the dry type quick coupling can be caused. In addition, in the scheme of the cascade type pressure relief of the second safety valve and the first safety valve, the back pressure of the second safety valve is high, and the model selection is difficult.
Disclosure of Invention
The invention aims to provide a pressure relief device of a road tank truck loading facility and a use method thereof, and aims to solve the following problems of the pressure relief device and the pressure relief method of the conventional road tank truck loading facility: overpressure liquid materials in a closed pipeline between an outlet of the numerical control valve and a dry-type quick connector of a lower loading arm are discharged to a storage tank, and a seller can easily measure and cheat the pressure-released liquid materials repeatedly; after pressure relief, if the closed pipeline is subjected to temperature drop and vacuum occurs, the opening of the numerical control valve and the dry type quick coupling is difficult; in the scheme of cascade pressure relief of the second safety valve and the first safety valve, the back pressure of the second safety valve is high, and model selection is difficult.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the utility model provides a pressure relief device of highway tank car equipment down which characterized in that: the pressure relief device comprises a pressure relief device, the pressure relief device is provided with a pressure relief device shell, an inner cavity of the pressure relief device shell is provided with an elastic membrane, the inner cavity of the pressure relief device shell is divided into a liquid material chamber and an air chamber by the elastic membrane, the liquid material chamber is positioned below the air chamber, and the liquid material chamber is connected with a pipe section between an outlet of the numerical control valve and an inlet of a lower loading crane pipe of a lower loading facility of the road tank truck through a pressure balance pipeline.
The pressure relief device is further characterized in that: the pressure relief device shell consists of an upper shell and a lower shell, the bottom of the upper shell is connected with the top of the lower shell through a flange, and the periphery of the elastic membrane is clamped between the flange at the bottom of the upper shell and the flange at the top of the lower shell.
The invention discloses a use method of a pressure relief device of a road tank truck loading facility, which is characterized by comprising the following steps: after the loading of the road tank truck unloading facility is stopped, the liquid material in the closed pipeline between the outlet of the numerical control valve and the dry-type quick connector of the unloading arm of the road tank truck unloading facility enters the liquid material chamber of the pressure relief device through the pressure balance pipeline for pressure relief after the temperature and the pressure rise and the volume expansion, the elastic membrane deforms upwards under the combined action of the pressure of the liquid material in the liquid material chamber, the pressure of the gas in the gas chamber and the surface tension of the elastic membrane, and the volume of the liquid material chamber is increased.
The above method of use is further characterized in that: when the temperature and the pressure of the liquid materials in the closed pipeline and the liquid material chamber are reduced and the volume of the liquid materials in the liquid material chamber is reduced, the elastic membrane deforms downwards under the combined action of the pressure of the liquid materials in the liquid material chamber, the pressure of gas in the gas chamber and the surface tension of the elastic membrane, the volume of the liquid material chamber is reduced, and the liquid materials in the liquid material chamber return to the closed pipeline through the pressure balance pipeline;
or after the road tank car unloading facility starts to load the car next time, the liquid material in the liquid material chamber returns to the pipe section of the car-loading pump outlet pipeline between the outlet of the numerical control valve and the inlet of the lower loading arm through the pressure balance pipeline.
The invention has the following beneficial effects: (1) After the unloading facility of the road tank car stops loading, the liquid material in the closed pipeline of the unloading facility of the road tank car between the outlet of the numerical control valve and the dry quick coupling of the unloading arm enters a liquid material chamber of the pressure relief device for pressure relief after the temperature and the pressure are increased and the volume is expanded; when the temperature and the pressure of the liquid materials in the closed pipeline and the liquid material chamber are reduced and the volume is reduced, the liquid materials in the liquid material chamber return to the closed pipeline. Or after the road tank car unloading facility starts to load the car next time, the liquid material in the liquid material chamber returns to the pipe section of the outlet pipeline of the loading pump, which is positioned between the outlet of the numerical control valve and the inlet of the lower loading arm. Because the liquid material do not discharge to the storage tank, so can eliminate the seller and carry out repeated metering and the possibility of cheating to the liquid material of pressure release, be favorable to guaranteeing the fairness of trade handing-over. (2) After pressure relief, if a closed pipeline between an outlet of the numerical control valve and a dry type quick connector of a lower loading arm meets temperature drop, the pressure of liquid materials is reduced, the liquid materials in the liquid material chamber can return to the closed pipeline, vacuum is prevented from occurring, and the difficulty in opening the numerical control valve and the dry type quick connector is avoided. (3) The pressure relief device is used for relieving the pressure of the closed pipeline without using a safety valve, and the pressure relief device is different from the scheme that the second safety valve and the first safety valve are used for pressure relief in a cascading mode in the existing road tank truck unloading facility, so that the problems of high back pressure and difficulty in model selection of the second safety valve do not exist. (4) The liquid material in the closed pipeline can enter a liquid material chamber of the pressure relief device for pressure relief, so as to prevent the leakage of the liquid material at the positions of a sealing rubber ring at the connecting part of the outlet of the lower loading arm and the dry-type quick connector, a sealing rubber ring at the upper rotating part of the lower loading arm, a sealing gasket at the upper flange of the lower loading arm and the like. (5) The pressure relief device has the advantages of simple structure, safe and efficient use method and strong feasibility.
The invention is mainly used in the road tank car loading facilities of petrochemical plants and reservoir areas.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The drawings and detailed description do not limit the scope of the invention as claimed.
Drawings
FIG. 1 is a schematic illustration of a road tanker installation and storage tank employing the pressure relief device of the present invention.
Fig. 2 is a schematic view of the vent of the present invention arranged vertically with the elastic membrane in a concave shape.
Fig. 3 is a schematic diagram of the pressure relief device of the present invention arranged vertically with the elastic membrane in a planar shape.
Fig. 4 is a schematic view of the vent of the present invention arranged vertically with the elastic membrane in a convex shape.
Fig. 5 is a schematic view of the pressure relief device of the present invention, which is disposed obliquely and the elastic membrane is concave.
In fig. 1 to 5, the same reference numerals denote the same technical features. The reference numerals denote: 1, a storage tank; 2, loading a pump; 3, a flow meter; 4-a numerical control valve; 5, a crane pipe is arranged below; 6-installing a dry quick joint of the oil filling riser 5; 7-pressure relief device; 8-inlet pipeline of the loading pump; 9-a car-loading pump outlet pipeline; 10-pot root valve; 11-a truck-mounted pump inlet valve; 12-a filter; 13-a check valve; 14-a truck-loading pump outlet valve; 15-pressure balance pipeline; 16-a gas injection pipe; 17-pressure gauge; 18-air chamber; 19-a liquid material chamber; 201-upper shell; 202-lower shell; 21-an elastic film; 22-gas injection valve; 23-a valve; 24-safety valve; 25-safety valve inlet conduit; 26-safety valve outlet conduit; 27 — signal lines.
Y — pressure (resultant force) of the liquid material in the liquid material chamber 19; q-the pressure (resultant) of the gas in the chamber 18; b — surface tension (resultant force) of the elastic film 21.
In fig. 2 to 5, a pressure equalization duct 15 is also shown.
Detailed Description
The installation for loading the road tank car shown in figure 1 is provided with a loading pump 2, a safety valve 24, a loading arm 5 and a pressure relief device 7. The pressure relief device of the road tank truck loading facility is simply called as a pressure relief device and comprises a pressure relief device 7. An inlet pipeline 8 of the loading pump is arranged between the inlet of the loading pump 2 and the outlet of the tank root valve 10, an outlet pipeline 9 of the loading pump is arranged between the outlet of the loading pump 2 and the inlet of the lower loading arm 5, and the inlet of the tank root valve 10 is connected with the storage tank 1 through a pipeline. The direction of following jar root valve 10 export to loading pump 2 entry on the loading pump inlet pipeline 8 is equipped with loading pump inlet valve 11 and filter 12 in proper order, and loading pump outlet pipeline 9 is gone up along the direction of following loading pump 2 exports to the entry of lower loading arm 5 and is equipped with check valve 13, loading pump outlet valve 14, flowmeter 3 and numerical control valve 4 in proper order, is equipped with signal line 27 between flowmeter 3 and the numerical control valve 4. The inlet of the safety valve 24 is connected with one end of a safety valve inlet pipeline 25, and the other end of the safety valve inlet pipeline 25 is connected with a pipe section of the truck-mounted pump outlet pipeline 9, which is positioned between the outlet of the truck-mounted pump outlet valve 14 and the inlet of the flowmeter 3. The outlet of the safety valve 24 is connected to one end of a safety valve outlet conduit 26, and the other end of the safety valve outlet conduit 26 is connected to the section of the truck-mounted pump inlet conduit 8 located between the outlet of the canister root valve 10 and the inlet of the truck-mounted pump inlet valve 11. The valve 23 is arranged on both the safety valve inlet line 25 and the safety valve outlet line 26, the valve 23 serving to shut off the liquid material during maintenance of the safety valve 24.
The pressure relief device 7 is provided with a pressure relief device housing. The inner cavity of the pressure relief device shell is provided with an elastic membrane 21, the elastic membrane 21 divides the inner cavity of the pressure relief device shell into a liquid material chamber 19 and an air chamber 18, and the liquid material chamber 19 is positioned below the air chamber 18. The liquid material chamber 19 is connected with a pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5 through a pressure balance pipeline 15; one end of the pressure equalizing line 15 is connected to the pipe section and the other end of the pressure equalizing line 15 is connected to the liquid material chamber 19.
Referring to fig. 1-5, the vent housing is generally comprised of an upper housing 201 and a lower housing 202. The bottom of the upper case 201 is connected to the top of the lower case 202 via a flange, and the periphery of the elastic membrane 21 is clamped between the flange at the bottom of the upper case 201 and the flange at the top of the lower case 202. The end of the pressure equalizing pipe 15 connected to the liquid material chamber 19 is located on the lower case 202. The upper shell 201 is provided with an air injection pipe 16 and a pressure gauge 17, and the air injection pipe 16 is provided with an air injection valve 22.
The material of the pressure relief device shell is carbon steel, stainless steel or alloy steel and the like. The material of the elastic membrane 21 should have good elastic deformability and excellent corrosion resistance to the liquid material; the material of the elastic membrane 21 is typically urethane rubber, nitrile rubber or fluorine rubber.
Referring to fig. 5, the angle a between the center line of the vent housing and the vertical line is generally 0 to 30 degrees. When the included angle a is 0 degree, the pressure relief device shell and the pressure relief device 7 are vertically arranged. When the included angle a is greater than 0 degree and less than or equal to 30 degrees, the pressure relief device housing and the pressure relief device 7 are obliquely arranged. The pressure equalization conduit 15 is generally coaxial with the centerline of the vent housing.
The upper casing 201 and the lower casing 202 have the same shape and may be a semi-ellipsoidal casing, a hemispherical casing, or a rectangular parallelepiped casing. The centerlines of the upper housing 201 and the lower housing 202 are coaxial, and are both coaxial with the centerline of the vent housing. The center lines are perpendicular to the sealing surfaces of the flanges on the upper casing 201 and the lower casing 202. The elastic membrane 21 has a planar shape without being applied by an external force or with a resultant force of an external force of 0, and is perpendicular to the center lines of the upper case 201 and the lower case 202, as shown in fig. 1 and 3.
The road tanker installation shown in figure 1 comprises all the components and piping outside the storage tank 1.
When the equipment for loading the road tank car is normally loaded, the dry quick connector 6 of the loading arm 5 is connected with the dry quick connector on the road tank car and is opened. The loading pump 2 is started, the tank root valve 10, the loading pump inlet valve 11, the loading pump outlet valve 14 and the numerical control valve 4 are all opened, and the check valve 13 and the safety valve 24 are in a normal working state. The liquid material in the storage tank 1 enters the road tank car through the inlet pipeline 8 of the loading pump, the loading pump 2, the outlet pipeline 9 of the loading pump, the lower loading arm 5, the dry type quick connector 6 of the lower loading arm 5 and the dry type quick connector of the road tank car. Meanwhile, the liquid material in the pipe section between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5 of the loading pump outlet pipe 9 enters the liquid material chamber 19 of the pressure relief device 7 through the pressure balance pipe 15. The elastic membrane 21 is formed in a concave shape by the combined action of the pressure Y of the liquid material in the liquid material chamber 19, the pressure Q of the gas in the gas chamber 18, and the surface tension B of the elastic membrane 21, and the volume of the liquid material chamber 19 is minimized. In the invention, the pressure Y of the liquid material in the liquid material chamber 19 and the pressure Q of the gas in the gas chamber 18 (and the surface tension B of the elastic membrane 21) are acting forces, and the unit is Newton, kilogram force and the like; the remaining pressure is in fact pressure.
When the loading amount of the liquid material reaches the loading amount set by the flowmeter 3, the flowmeter 3 controls to close the numerical control valve 4 through the signal line 27, then the dry type quick connector 6 of the lower loading arm 5 is separated from the dry type quick connector on the road tank car manually, the dry type quick connector 6 of the lower loading arm 5 is closed, and the loading operation is finished; the truck-mounted pump 2 is stopped and the state of the other valves is unchanged, and the volume of the liquid material chamber 19 is kept to a minimum. The use method of the pressure relief device 7 in the pressure relief device is that after the unloading facility of the road tank car stops loading the car this time and before next loading, the liquid material in the closed pipeline (simply called closed pipeline) between the outlet of the numerical control valve 4 and the dry-type quick connector 6 of the lower loading arm 5 enters the liquid material chamber 19 of the pressure relief device 7 through the pressure balance pipeline 15 for pressure relief after the temperature and pressure rise and the volume expansion. The elastic membrane 21 is deformed upward by the pressure Y of the liquid material in the liquid material chamber 19, the pressure Q of the gas in the gas chamber 18, and the surface tension B of the elastic membrane 21, and the volume of the liquid material chamber 19 is increased.
When the liquid material in the closed pipeline and the liquid material chamber 19 is reduced in temperature and pressure and reduced in volume, the elastic membrane 21 is deformed downward under the combined action of the pressure Y of the liquid material in the liquid material chamber 19, the pressure Q of the gas in the gas chamber 18 and the surface tension B of the elastic membrane 21, the volume of the liquid material chamber 19 is reduced, and the liquid material in the liquid material chamber 19 returns to the closed pipeline through the pressure balance pipeline 15.
Or after the next loading of the road tank car unloading facility, the liquid material in the liquid material chamber 19 returns to the pipe section of the loading pump outlet pipeline 9 between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5 through the pressure balance pipeline 15, and then enters the road tank car through the lower loading arm 5, the dry type quick connector 6 of the lower loading arm 5 and the dry type quick connector on the road tank car. After this process is completed, the volume of the liquid material chamber 19 is minimized.
As the volume of the liquid material chamber 19 increases, the volume of the air chamber 18 decreases; the volume of the air chamber 18 is at a minimum when the volume of the liquid material chamber 19 is at a maximum. When the volume of the liquid material chamber 19 is decreased, the volume of the air chamber 18 is increased; when the volume of the liquid material chamber 19 is minimum, the volume of the air chamber 18 is maximum. And vice versa. When the volume of the liquid material chamber 19 is changed, the liquid material always fills the liquid material chamber 19.
When the liquid material in the closed pipe enters the liquid material chamber 19, referring to fig. 2 and 5, when the elastic membrane 21 is concave and Y + B > Q, the elastic membrane 21 is deformed upward. Referring to fig. 3, when the elastic membrane 21 has a planar shape, Y > Q, the elastic membrane 21 is deformed upward. Referring to fig. 4, when the elastic membrane 21 is in a convex shape, Y > Q + B, the elastic membrane 21 is deformed upward. When the elastic film 21 is in a planar shape, the surface tension B of the elastic film 21 is 0, and the elastic film 21 is not deformed.
When the liquid material in the liquid material chamber 19 returns to the closed pipeline, or when the road tank car unloading facility starts to load the liquid material for the next time, and the liquid material in the liquid material chamber 19 returns to the pipe section of the pump outlet pipeline 9 of the loading pump between the outlet of the numerical control valve 4 and the inlet of the lower loading arm 5, referring to fig. 4, when the elastic membrane 21 is in an upward convex shape, and Q + B is greater than Y, the elastic membrane 21 deforms downward. Referring to fig. 3, when the elastic membrane 21 has a planar shape, Q > Y, the elastic membrane 21 is deformed downward. Referring to fig. 2 and 5, when the elastic membrane 21 is in a concave shape, Q > Y + B, the elastic membrane 21 is deformed downward. When the volume of the liquid material chamber 19 reaches a minimum, the liquid material returning process is stopped; the degree of concavity of the elastic membrane 21 is at its maximum (refer to fig. 2 and 5, but the degree of concavity of the elastic membrane 21 shown in fig. 2 and 5 is generally not at its maximum). When the volume of the liquid material chamber 19 reaches a minimum, the liquid material therein remains in the liquid material chamber 19.
In the concave, flat or convex shape shown in the drawing, when the resultant force of the pressure Y of the liquid material in the liquid material chamber 19, the pressure Q of the gas in the gas chamber 18 and the surface tension B of the elastic membrane 21 is zero, the elastic membrane 21 stops deforming.
The liquid material is a liquid oil product, liquefied petroleum gas or a chemical product in the petrochemical industry. The oil product is gasoline, kerosene, diesel oil, naphtha or topped oil. The liquefied petroleum gas is propylene, butane or propane, or a mixture of butane and propane. The chemical product is benzene, methanol or ethanol. The temperature of the liquid material stored in the storage tank 1 is generally 10-40 ℃. When the liquid materials are oil products and chemical products, the pressure is generally 0.05-0.15 MPa at the joint of the outlet pipeline 9 of the loading pump and the pressure balance pipeline 15; when the liquid material is liquefied petroleum gas, the pressure is generally 0.4-1.2 MPa (the pressure is gauge pressure).
The gas in the chamber 18 of the vent 7 of the present invention is typically nitrogen, inert gas or carbon dioxide. Under the working condition that the loading facility of the road tank car is normally loaded or under the non-pressure-relief working condition that the loading facility of the road tank car stops loading, when the liquid material is oil or chemical product, the pressure of the gas in the gas chamber 18 is generally 0.1-0.4 MPa; when the liquid material is liquefied petroleum gas, the pressure of the gas in the gas chamber 18 is generally 0.5-1.8 MPa (the pressure is gauge pressure). The pressure of the gas in the gas chamber 18 is the pressure of the gas at the maximum volume of the gas chamber 18. As the volume of the chamber 18 decreases, the pressure of the gas increases, which can be calculated as the equation of state of the desired gas. The non-decompression working condition refers to a working condition that the liquid material in the closed pipeline does not enter the liquid material chamber 19 for decompression due to temperature and pressure rise and volume expansion.
Referring to fig. 1, after the loading of the road tank truck unloading facility is stopped, the liquid material in the pipe section between the outlet of the check valve 13 and the inlet of the numerical control valve 4 in the loading pump outlet pipeline 9 is decompressed to the pipe section between the outlet of the tank root valve 10 and the inlet of the loading pump inlet valve 11 through the safety valve inlet pipeline 25, the safety valve 24 and the safety valve outlet pipeline 26 after the temperature and the pressure are increased and exceed the constant pressure of the safety valve 24, and then returns to the storage tank 1 through the tank root valve 10. When the pressure of the liquid material in the pipe section of the loading pump outlet pipeline 9 between the outlet of the check valve 13 and the inlet of the numerical control valve 4 is reduced to the recoil pressure of the safety valve 24, the safety valve 24 is closed, and the discharge is stopped. The constant pressure of the safety valve 24 is 1.05 to 1.15 times of the pressure of the dead point of the loading pump 2, and the recoil pressure of the safety valve 24 is 95 to 97 percent of the constant pressure of the safety valve 24. The pressure of the closing point of the loading pump 2 is the maximum pressure of the outlet of the loading pump 2 when the outlet valve 14 of the loading pump is closed. The safety valve 24, the safety valve inlet pipeline 25, the safety valve outlet pipeline 26 and the valve 23 belong to a part of a pressure relief device of a road tank truck unloading facility; the pressure relief process is carried out by using a safety valve 24, and belongs to a part of the pressure relief method of the road tank truck unloading facility. The pressure relief device of the road tank truck unloading facility comprises a pressure relief device 7, a safety valve 24, a pressure balance pipeline 15, a safety valve inlet pipeline 25, a safety valve outlet pipeline 26 and a valve 23.
The flowmeter 3 used in the invention is a mass flowmeter and is used for measuring the mass flow of the liquid material. When the road tank truck unloading facility loads liquid materials to the road tank truck for the first time, the flowmeter 3 starts to measure the mass flow of the liquid materials after the pipeline between the storage tank 1 and the dry quick connector 6 of the unloading arm 5 and the liquid material chamber 19 with the smallest volume are filled with the liquid materials. After the last loading operation is finished, the liquid material remained in the pipeline between the outlet of the flowmeter 3 and the dry-type quick connector 6 of the lower loading arm 5 does not enter the highway tank truck of the last loading but enters the highway tank truck of the current loading. After the loading operation is finished, the liquid material remained in the pipeline between the outlet of the flowmeter 3 and the dry quick connector 6 of the lower loading arm 5 does not enter the road tank car for the loading operation, but enters the road tank car for the next loading operation.
Claims (13)
1. The utility model provides a pressure relief device of highway tank car equipment of downloading which characterized in that: pressure relief device include pressure release ware (7), pressure release ware (7) are equipped with the pressure release ware casing, the inner chamber of pressure release ware casing is equipped with elastic membrane (21), elastic membrane (21) divide into liquid material room (19) and air chamber (18) with the inner chamber of pressure release ware casing, liquid material room (19) are located air chamber (18) below, the pipeline section that loading pump outlet pipeline (9) of loading facility under liquid material room (19) and the highway tank car are located numerical control valve (4) export and loading arm (5) entry down links to each other through pressure balance pipeline (15).
2. The pressure relief device of claim 1, wherein: the pressure relief device shell consists of an upper shell (201) and a lower shell (202), the bottom of the upper shell (201) is connected with the top of the lower shell (202) through a flange, and the periphery of the elastic membrane (21) is clamped between the flange at the bottom of the upper shell (201) and the flange at the top of the lower shell (202).
3. The pressure relief device according to claim 1 or 2, wherein: the elastic membrane (21) is made of polyurethane rubber, nitrile rubber or fluororubber.
4. The pressure relief device according to claim 1 or 2, wherein: the included angle A between the central line of the pressure relief device shell and the vertical line is 0-30 degrees.
5. The pressure relief device of claim 4, wherein: the upper shell (201) and the lower shell (202) are the same in shape and are semi-ellipsoidal shells, hemispherical shells or rectangular shells.
6. The use method of the pressure relief device of the road tank truck installation facility as claimed in claim 1 or 2, characterized in that: after the loading of the road tank truck unloading facility is stopped, the liquid material in a closed pipeline between the outlet of the numerical control valve (4) and the dry quick connector (6) of the unloading arm (5) of the road tank truck unloading facility enters a liquid material chamber (19) of a pressure relief device (7) through a pressure balance pipeline (15) for pressure relief after temperature and pressure rise and volume expansion, an elastic membrane (21) deforms upwards under the combined action of the pressure Y of the liquid material in the liquid material chamber (19), the pressure Q of gas in a gas chamber (18) and the surface tension B of the elastic membrane (21), and the volume of the liquid material chamber (19) is increased.
7. The method of claim 6, wherein: when the temperature and the pressure of the liquid material in the closed pipeline and the liquid material chamber (19) are reduced and the volume is reduced, the elastic membrane (21) deforms downwards under the combined action of the pressure Y of the liquid material in the liquid material chamber (19), the pressure Q of the gas in the air chamber (18) and the surface tension B of the elastic membrane (21), the volume of the liquid material chamber (19) is reduced, and the liquid material in the liquid material chamber (19) returns to the closed pipeline through the pressure balance pipeline (15);
or after the road tank car unloading facility starts to load the car for the next time, the liquid material in the liquid material chamber (19) returns to the pipe section of the pump outlet pipeline (9) of the loading pump, which is positioned between the outlet of the numerical control valve (4) and the inlet of the unloading arm (5), through the pressure balance pipeline (15).
8. The method of claim 6, wherein: the liquid material in the closed pipeline enters the liquid material chamber (19), and when the elastic membrane (21) is concave and Y + B is larger than Q, or when the elastic membrane (21) is flat and Y is larger than Q, or when the elastic membrane (21) is convex and Y is larger than Q + B, the elastic membrane (21) deforms upwards.
9. The method of claim 7, wherein: the liquid material in the liquid material chamber (19) returns to the closed pipeline or returns to the pipe section of the truck pump outlet pipeline (9) between the outlet of the numerical control valve (4) and the inlet of the lower loading arm (5), and when the elastic membrane (21) is in an upward convex shape and Q + B is more than Y, or when the elastic membrane (21) is in a plane shape and Q is more than Y, or when the elastic membrane (21) is in a downward concave shape and Q is more than Y + B, the elastic membrane (21) deforms downwards.
10. The method according to any one of claims 6 to 9, characterized in that: the elastic membrane (21) is concave, flat or convex, and when the resultant force of the pressure Y of the liquid material, the pressure Q of the gas and the surface tension B of the elastic membrane (21) is zero, the elastic membrane (21) stops deforming.
11. The method according to claim 6 or 7, characterized in that: the liquid material is liquid oil, liquefied petroleum gas or chemical products in the petrochemical industry. The oil product is gasoline, kerosene, diesel oil, naphtha or topped oil, the liquefied petroleum gas is propylene, butane or propane, or a mixture of butane and propane, and the chemical product is benzene, methanol or ethanol.
12. The method of claim 11, wherein: the gas in the gas chamber (18) is nitrogen, inert gas or carbon dioxide.
13. The method of claim 12, wherein: under the working condition that the loading facility of the road tank car is normally loaded or under the non-pressure-relief working condition after the loading facility of the road tank car stops loading, when the liquid material is oil or chemical product, the pressure of the gas in the gas chamber (18) is 0.1-0.4 MPa, and when the liquid material is liquefied petroleum gas, the pressure of the gas in the gas chamber (18) is 0.5-1.8 MPa.
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| CN202211082173.3A CN115259067B (en) | 2022-09-06 | 2022-09-06 | Pressure relief device of road tank truck unloading facility and use method thereof |
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| CN117525771A (en) * | 2024-01-05 | 2024-02-06 | 深圳市誉辰智能装备股份有限公司 | Constant-pressure liquid injection sealing bin of battery and pressure reduction and relief method thereof |
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| CN115259068B (en) * | 2022-09-06 | 2024-09-27 | 中国石油化工股份有限公司 | Pressure relief device of road tank truck unloading facility and application method thereof |
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| CN115259067B (en) | 2024-09-27 |
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