CN110143380B - Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank - Google Patents
Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank Download PDFInfo
- Publication number
- CN110143380B CN110143380B CN201810148570.3A CN201810148570A CN110143380B CN 110143380 B CN110143380 B CN 110143380B CN 201810148570 A CN201810148570 A CN 201810148570A CN 110143380 B CN110143380 B CN 110143380B
- Authority
- CN
- China
- Prior art keywords
- storage tank
- pressure
- vocs
- valve
- open fire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of safety of equipment for safely collecting and discharging volatile organic compounds of normal-pressure and low-pressure storage tanks, and discloses a safety device of equipment for discharging Volatile Organic Compounds (VOCs) from a storage tank, which comprises a storage tank group for various materials, air extraction equipment and open fire equipment. The invention can effectively control the gas phase space of the storage tank to form an explosive environment, reduces the risk of fire hazard of the storage tank, can dually prevent explosive gas from being formed in the pipeline before entering open fire equipment, and ensures the absolute safety of the open fire equipment. Meanwhile, the invention also realizes the treatment of VOCs in various material storage tanks.
Description
Technical Field
The invention relates to the technical field of safe collection and discharge of volatile organic compounds of normal-pressure and low-pressure storage tanks, in particular to a safety device of open fire equipment for discharging VOCs (volatile organic compounds) of a storage tank.
Background
The emission of malodorous gases caused by the breathing of a storage tank, the volatilization of residual oil, shutdown sweeping lines, the volatilization of solvents carried in oil products and the like becomes a great pollution source of air pollution of petroleum, petrochemical and chemical enterprises, and is one of the main sources of Volatile Organic Compounds (VOCs) in plant areas. Along with the increasing attention of the country to environmental protection, relevant regulation standards are increasingly strict, and in order to meet the requirements of national laws and regulations, various refining enterprises begin to implement large-area VOCs collection and treatment engineering of an oil product storage system.
At present, the storage tank VOCs treatment mode that the enterprise adopted is to connect a plurality of storage tank groups into a whole through gaseous phase connecting wire and collect VOCs to send to follow-up oil gas processing apparatus through booster fan. The most common oil gas treatment device is an oil gas recovery device, but with the stricter and stricter discharge indexes of VOCs in the national environmental protection standard, the up-to-standard discharge of the VOCs in the storage tank is difficult to realize simply by improving the oil gas recovery efficiency. Therefore, enterprises often introduce VOCs into open flame facilities such as thermal oxidation furnaces (TO), regenerative thermal oxidation furnaces (RTO), incinerators, heating furnaces, cracking furnaces, and catalyst regenerators for incineration treatment. However, these open fire devices are themselves ignition sources, and their flames may propagate along the VOCs collection lines to the tank farm, causing a significant group of tank fires. Meanwhile, after the storage tanks are connected into a whole through the gas-phase communicating pipeline collecting system, when a fire breaks out in one storage tank, flame can be transmitted to other storage tanks along the gas-phase communicating pipeline, and a great risk of fire of a group of storage tanks exists. In recent years, accidents frequently happen to gas phase communication tank groups, and after a No. 6 tank of a certain petrochemical enterprise of Nanjing explodes, the No. 7 and No. 8 tanks are subjected to flash explosion sequentially due to the fact that gas phase pipelines of the tanks are communicated. When the induced draft fan of the Ningbo chemical plant incinerator breaks down, the combustible gas of the production device flows back to each storage tank through the tank area waste gas collecting pipe, and fire disasters are caused. Therefore, in order to meet the higher requirements of high-standard environmental protection measures on safety, the safety device of the storage tank VOCs open fire discharge equipment needs to be researched and developed urgently, and the safety device has very important significance for solving the problem of treatment of the storage tank VOCs and preventing the fire of the large group of gas-phase communicated tanks.
Disclosure of Invention
The invention aims to solve the problems that the gas phase space of a storage tank in the prior art is easy to form an explosive environment and open fire equipment is easy to explode, and provides a safety device of the open fire equipment for discharging VOCs (volatile organic chemicals) in the storage tank.
In order to achieve the above object, the present invention provides a safety device for an open fire device for discharging VOCs from a storage tank, comprising a plurality of storage tank sets for storing materials, an air extractor and an open fire device; the system comprises a storage tank group, a plurality of storage tank roofs, an oil-gas manifold, an oil-gas main pressure monitor, an oxygen content analyzer and a cut-off valve, wherein each storage tank roof in the storage tank group is respectively provided with the storage tank pressure monitor and the oil-gas branch pipe; each storage tank in the storage tank group is connected with a nitrogen supplementing pipeline through a nitrogen seal valve, and the opening and closing of the nitrogen seal valve are controlled through monitoring signals of a storage tank pressure monitor; be equipped with trip valve and pressure monitor on the pipeline between air exhaust equipment and the naked light equipment in proper order, be equipped with urgent blow-down pipe on the pipeline between trip valve and the air exhaust equipment, be equipped with the control valve on the urgent blow-down pipe, through closing of pressure monitor monitoring signal interlocking control trip valve and opening of control valve.
Compared with the prior art, the invention has the following beneficial effects:
(1) the storage tank gas phase space of the same kind of or similar material is stored in the direct intercommunication, utilizes pressure and pressure differential monitoring control, not only realizes the VOCs of multiple material storage tank and handles, still can effectively reduce the storage tank and breathe greatly, reduces the emission of VOCs.
(2) The storage tank gas phase space is effectively controlled through the classified collection pipeline, the nitrogen sealing facility and the like to form an explosive environment, and the risk of fire of the storage tank is reduced.
(3) The oxygen content control device prevents explosive gas from forming in the pipeline before entering the open fire equipment, thereby preventing flash explosion in the open fire equipment.
(4) And the facility is purged by nitrogen, so that the tempering and flash explosion accidents are prevented when the flow of the VOCs is low.
Drawings
Fig. 1 is a schematic diagram of a safety device of the equipment for discharging the VOCs from the storage tank in the embodiment 1.
Description of the reference numerals
1A/B-storage tank group, 2-storage tank pressure monitoring, 3-oil gas branch pipe, 4-oil gas branch pipe flame arrester, 5-tank group oil gas collection pipe pressure monitoring, 6-exhaust valve, 7-nitrogen sealing valve, 8-oil gas main pipe, 9A/B-tank group oil gas collection pipe, 10-pressure difference monitoring, 11-tank group oil gas collection pipe pressure monitoring, 12-oxygen content analyzer, 13-air extraction equipment, 14-air extraction equipment flame arrester, 15-nitrogen supply control valve, 16-nitrogen supply pipeline, 17-cut-off valve, 18-emergency vent pipe, 19-control valve, 20-pipe end flame arrester, 21-pressure monitoring, 22-nitrogen supply control valve, 23-nitrogen blowing pipeline, 24-flame arrester and 25-open fire equipment, 26-nitrogen supplement pipeline.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
A safety device of open fire equipment for discharging VOCs (volatile organic compounds) from a storage tank comprises a storage tank group 1, air extraction equipment 13 and open fire equipment 25 for various materials; the system comprises a storage tank group 1, an oil-gas main pipe 8, an air pumping device 13 and an open fire device 25, wherein each storage tank top in the storage tank group 1 is respectively provided with a storage tank pressure monitor 2 and an oil-gas branch pipe 3, the oil-gas branch pipes 3 of a plurality of storage tank tops for storing same or similar materials are respectively connected to the oil-gas main pipe 9 of the storage tank group for storing same or similar oil gas, the oil-gas main pipe 9 of the storage tank group for storing same or similar oil gas is respectively connected to the oil-gas main pipe 8, the oil-gas main pipe 8 in front of the air pumping device 13 is sequentially provided with a tank group oil-gas main pipe pressure monitor 11 and an oxygen content analyzer 12, the opening and closing of the air pumping device 13 are controlled by monitoring signals; each storage tank in the storage tank group 1 is connected with a nitrogen supplementing pipeline 26 through a nitrogen sealing valve 7, and the opening and closing of the nitrogen sealing valve 7 are controlled through monitoring signals of a storage tank pressure monitor 2; be equipped with trip valve 17 and pressure monitor 21 on the pipeline in proper order between suction apparatus 13 and naked light equipment 25, be equipped with urgent blow-down pipe 18 on the pipeline between trip valve 17 and the suction apparatus 13, be equipped with control valve 19 on the urgent blow-down pipe 18, through closing of pressure monitor 21 monitoring signal interlocking control trip valve 17 and opening of control valve 19.
The gas phase spaces of the plurality of storage tanks for storing the same or similar materials are directly communicated, so that discharged gas is contained by other discharged storage tanks when the storage tanks receive the materials, the emission of volatile organic compounds of the storage tanks is reduced, and facilities such as nitrogen seal and the like are added to effectively control the gas phase spaces of the storage tanks to form an explosive environment, so that the risk of fire hazard of the storage tanks is reduced; through the first safety line of oxygen content analysis facility interlocking control air exhaust equipment and trip valve, prevent to get into the interior explosive gas of pipeline before the naked light equipment to prevented to explode in the naked light equipment, through the second safety line of emergency evacuation facility again, dual absolute safety who ensures the naked light equipment. Meanwhile, the invention realizes the treatment of VOCs of various material storage tanks through the pressure monitoring facility of the oil-gas main pipe of the tank group.
According to the invention, the air extraction device 13 is started when the pressure monitor 11 of the oil and gas collecting pipe of the tank group monitors that the pressure in the oil and gas collecting pipe 8 reaches the set value of the starting pressure of the air extraction device 13, the air extraction device 13 is started, and VOCs are conveyed to the open fire device 25, so that the VOCs of various material storage tanks are treated.
According to the invention, the air extraction device 13 is closed, when the tank group oil and gas collecting pipe pressure monitor 11 detects that the pressure in the oil and gas collecting pipe 8 reaches the closing pressure set value of the air extraction device 13, the air extraction device 13 is closed, and the delivery of VOCs to the open fire device 25 is stopped.
Preferably, the set value of the opening pressure of the air exhaust device 13 is 0.6-1.2kPa, and the set value of the closing pressure of the air exhaust device 13 is 0-0.2 kPa.
According to the invention, the air extraction device 13 and the cut-off valve 17 are closed in an interlocking manner when the oxygen content analyzer 12 detects that the oxygen content in the VOCs in the oil gas main pipe 8 exceeds the oxygen content interlocking volume concentration B, and the double-protection line ensures the flash explosion accident of open fire equipment.
Preferably, the oxygen content interlocking volume concentration B is 2 to 8%, and may be, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or any value in the range of any two of these values.
According to the invention, the nitrogen sealing valve 7 is opened when the storage tank pressure monitor 2 monitors that the storage tank pressure reaches the opening pressure set value of the nitrogen sealing valve 7, the nitrogen sealing valve 7 is opened, and the nitrogen supplementing pipeline 26 supplements nitrogen to the storage tank, so that the negative pressure of the storage tank is prevented from entering air.
According to the invention, the closing of the nitrogen sealing valve 7 is to close the nitrogen sealing valve 7 when the tank pressure monitor 2 detects that the tank pressure is lower than the closing pressure set value of the nitrogen sealing valve 7, and the nitrogen supplementing pipeline 26 stops supplementing nitrogen to the tank.
According to the invention, the opening pressure setting value of the nitrogen sealing valve 7 is 0.1-0.3kPa, for example, 0.1kPa, 0.15kPa, 0.2kPa, 0.25kPa, 0.3kPa and any of the range of any two of these point values, and the closing pressure setting value of the nitrogen sealing valve 7 is 0.4-0.8kPa, for example, 0.4kPa, 0.45kPa, 0.5kPa, 0.55kPa, 0.6kPa, 0.65kPa, 0.7kPa, 0.75kPa, 0.8kPa and any of the range of any two of these point values.
Preferably, the difference between the opening pressure set point and the closing pressure set point is not less than 0.3 kPa.
According to the invention, the closing of the interlocking control cut-off valve 17 and the opening of the control valve 19 are realized in such a way that when the pressure monitor 21 detects that the pressure in the pipeline before the open fire equipment 25 is lower than 0.5-5kPa, the interlocking closes the cut-off valve 17, the delivery of VOCs to the open fire equipment 25 is stopped, and simultaneously, the control valve 19 is opened, and the emergency emptying is carried out through the emergency emptying pipe 18.
In the invention, in order to prevent the oxygen content concentration in the oil gas main pipe from exceeding the standard, a nitrogen supplement pipeline 16 is also arranged on the oil gas main pipe 8 in front of the oxygen content analyzer 12, a nitrogen supplement control valve 15 is also arranged on the nitrogen supplement pipeline 16, and the opening of the nitrogen supplement control valve 15 is controlled by a detection signal of the oxygen content analyzer 12, so that the safety control of the oxygen content is realized.
According to the invention, the nitrogen supplement control valve 15 is opened when the oxygen content analyzer 12 detects that the oxygen content in the VOCs in the oil-gas main pipe 8 exceeds the oxygen content interlocking volume concentration A, the nitrogen supplement control valve 15 is opened to supplement nitrogen to the VOCs, so that the oxygen content is reduced to be lower than the oxygen content interlocking volume concentration A.
Preferably, the oxygen content interlocking volume concentration A is from 1 to 6%. For example, it may be 1%, 2%, 3%, 4%, 5%, 6%, or any value within a range defined by any two of these point values.
In the invention, in order to realize the treatment of the VOCs of the storage tanks for various materials, a tank group oil-gas collecting pipe pressure monitor 5 and an exhaust valve 6 are respectively arranged on the tank group oil-gas collecting pipe 9, pressure difference monitors 10 are arranged in front of and behind the exhaust valve 6, the opening of the exhaust valve 6 is controlled by monitoring signals of the storage tank pressure monitor 2, the tank group oil-gas collecting pipe pressure monitor 5 and the pressure difference monitors 10, and the closing of the exhaust valve 6 is controlled by monitoring signals of the storage tank pressure monitor 2, the tank group oil-gas collecting pipe pressure monitor 5 or the pressure difference monitors 10.
According to the invention, the exhaust valve 6 is opened when the storage tank pressure monitor 2 monitors that the storage tank pressure and the tank group oil and gas collecting main pipe pressure monitor 5 monitors that the main pipe pressure reaches the opening pressure set value of the exhaust valve 6, and the condition that the differential pressure monitor 10 monitors that the differential pressure before and after the exhaust valve 6 is not less than 0 is also met, the exhaust valve 6 is opened, and the storage tank exhausts gas to the oil and gas main pipe 8.
According to the invention, the closing of the exhaust valve 6 is to close the exhaust valve 6 when the storage tank pressure monitor 2 monitors that the storage tank pressure or the oil and gas collecting pipe pressure monitor 5 of the tank group monitors that the main pipe pressure is lower than the closing pressure set value of the exhaust valve 6, or when the differential pressure monitor 10 monitors that the differential pressure before and after the exhaust valve 6 is less than 0, and the storage tank stops exhausting to the oil and gas collecting pipe 8.
According to the invention, the set value of the opening pressure of the exhaust valve 6 < positive pressure of the breathing valve setting x (1-overpressure value of the breathing valve), the set value of the closing pressure of the exhaust valve 6 > the set value of the closing pressure of the nitrogen-sealed valve 7.
In the invention, in order to prevent the backfire and flash explosion accidents when the flow of VOCs is low, the triple safety of open fire equipment is ensured. A nitrogen purging pipeline 23 is further arranged between the open fire equipment 25 and the pressure monitor 21, a nitrogen supplementing control valve 22 is further arranged on the nitrogen purging pipeline 23, and the opening of the nitrogen supplementing control valve 15 is controlled through a detection signal of the pressure monitor 21.
According to the invention, the opening pressure of the nitrogen supply control valve 15 is 0.5-5 kPa.
In the invention, in order to effectively prevent flame from spreading along the communication pipe network and avoid the occurrence of a large group of tank fires, the front and rear pipelines of the air extraction equipment 13 are respectively provided with an air extraction equipment flame arrester 14.
In the invention, in order to effectively prevent flame from spreading along a communication pipe network and avoid fire accidents of major groups of tanks, an oil-gas branch pipe flame arrester 4 is further arranged on the oil-gas branch pipe 3 of each storage tank, and preferably, the oil-gas branch pipe flame arrester 4 is a pipeline detonation type flame arrester.
In the invention, in order to effectively prevent flame from spreading along the communication pipe network and avoid the occurrence of a large tank group fire, the emergency emptying pipe 18 is also provided with a pipe end fire arrestor 20.
In the invention, in order to effectively prevent flame from spreading along the communication pipe network and avoid the occurrence of a large group of tank fire, a fire arrestor 24 is also arranged on the pipeline before entering the open fire equipment 25.
The flame arrestor 24 is preferably a deflagration-type flame arrestor with a temperature monitoring function and is installed at a location where the ratio of the length of the pipe to the diameter of the pipe before entering the open flame equipment is less than 50.
In the present invention, the pressure means gauge pressure.
The present invention will be described in detail below by way of examples. In the following examples, the oxygen content interlocking volume concentration parameter was measured by a laser oxygen content monitoring method.
Example 1
Referring to fig. 1, the safety device of the open fire equipment for discharging the VOCs in the storage tank comprises a storage tank group 1A/B of two materials, an air extraction device 13 and an open fire equipment 25.
Each storage tank filling top in the storage tank group 1A/B is respectively provided with a storage tank pressure monitor 2 and an oil-gas branch pipe 3, the oil-gas branch pipes 3 of a plurality of storage tank tops for storing one kind of same or similar materials are respectively connected with a tank group oil-gas collecting pipe 9A, the tank group oil-gas collecting pipes 9A are respectively connected to an oil-gas main pipe 8, similarly, the oil-gas branch pipes 3 of the plurality of storage tank tops for storing another kind of same or similar materials are respectively connected with a tank group oil-gas collecting pipe 9B, and the tank group oil-gas collecting pipes 9B are respectively connected to the oil-gas main pipe 8, so that the gas phase spaces of the plurality of storage tanks for storing the same kind of same or similar materials are communicated, discharged gas is contained by other storage tanks which pay materials at the same time when the storage tanks receive the materials; the oil-gas main pipe 8 is sequentially connected with an air extraction device 13 and an open fire device 25, a tank group oil-gas main pipe pressure monitor 11 and an oxygen content analyzer 12 are sequentially arranged on the oil-gas main pipe 8 in front of the air extraction device 13, the opening and closing of the air extraction device 13 are controlled through monitoring signals of the tank group oil-gas main pipe pressure monitor 11, and the air extraction device 13 and a cut-off valve 17 are closed in an interlocking manner through detection signals of the oxygen content analyzer 12; each storage tank in the storage tank group 1 is connected with a nitrogen supplementing pipeline 26 through a nitrogen sealing valve 7, and the opening and closing of the nitrogen sealing valve 7 are controlled through monitoring signals of a storage tank pressure monitor 2; be equipped with trip valve 17 and pressure monitor 21 on the pipeline in proper order between suction apparatus 13 and naked light equipment 25, be equipped with urgent blow-down pipe 18 on the pipeline between trip valve 17 and the suction apparatus 13, be equipped with control valve 19 on the urgent blow-down pipe 18, through closing of pressure monitor 21 monitoring signal interlocking control trip valve 17 and opening of control valve 19.
And the starting of the air pumping equipment 13 is to start the air pumping equipment 13 when the pressure monitor 11 of the oil gas main pipe of the tank group monitors that the pressure in the oil gas main pipe 8 reaches a set value of the starting pressure of the air pumping equipment 13, and convey the VOCs to the open fire equipment 25 to realize the treatment of the VOCs of the two material storage tanks.
And the air extraction equipment 13 is closed, when the tank group oil gas main pressure monitor 11 monitors that the pressure in the oil gas main 8 reaches the closing pressure set value of the air extraction equipment 13, the air extraction equipment 13 is closed, and the delivery of the VOCs to the open fire equipment 25 is stopped.
Wherein the set value of the opening pressure of the air extraction equipment 13 is 0.9kPa, and the set value of the closing pressure of the air extraction equipment 13 is 0 kPa.
The interlocking closing air extraction device 13 and the cut-off valve 17 are used for interlocking closing the air extraction device 13 and the cut-off valve 17 when the oxygen content analyzer 12 detects that the oxygen content in the VOCs in the oil gas main pipe 8 exceeds the oxygen content interlocking volume concentration B, and the double-prevention line ensures the flash explosion accident of the open fire equipment.
The oxygen content interlocking volume concentration B was 4 vol%.
The opening of the nitrogen sealing valve 7 is to open the nitrogen sealing valve 7 when the storage tank pressure monitor 2 monitors that the storage tank pressure reaches the opening pressure set value of the nitrogen sealing valve 7, and the nitrogen supplementing pipeline 26 supplements nitrogen to the storage tank to prevent the negative pressure of the storage tank from entering air.
The closing of the nitrogen sealing valve 7 is to close the nitrogen sealing valve 7 and stop the nitrogen supplement of the storage tank through the nitrogen supplement pipeline 26 when the storage tank pressure monitor 2 monitors that the storage tank pressure is lower than the closing pressure set value of the nitrogen sealing valve 7.
Wherein, the set value of the opening pressure of the nitrogen sealing valve 7 is 0.2kPa, and the set value of the closing pressure of the nitrogen sealing valve 7 is 0.5 kPa.
The interlocking control cut-off valve 17 is closed and the control valve 19 is opened, when the pressure monitor 21 monitors that the pressure in the pipeline before the open fire equipment 25 is lower than 2kPa, the interlocking closes the cut-off valve 17, the delivery of VOCs to the open fire equipment 25 is stopped, and simultaneously, the control valve 19 is opened, and the emergency emptying is carried out through the emergency emptying pipe 18.
Still be equipped with on the oil gas house steward 8 before oxygen content analysis appearance 12 and mend nitrogen line 16, still be equipped with on the nitrogen line 16 and mend nitrogen control valve 15, open through 12 detection signal control nitrogen control valve 15 of oxygen content analysis appearance, realize the safety control of oxygen content.
And the opening of the nitrogen supplement control valve 15 is to open the nitrogen supplement control valve 15 to supplement nitrogen into the VOCs when the oxygen content analyzer 12 detects that the oxygen content in the oil gas main pipe 8 to the VOCs exceeds 6% of the oxygen content interlocking volume concentration, so that the oxygen content is reduced to be lower than 6% of the oxygen content interlocking volume concentration.
Still be equipped with jar group oil gas collecting pipe pressure monitor 5 and discharge valve 6 on jar group oil gas collecting pipe 9 respectively, be equipped with pressure difference monitor 10 around discharge valve 6, the monitoring signal through storage tank pressure monitor 2, jar group oil gas collecting pipe pressure monitor 5 and pressure difference monitor 10 controls opening of discharge valve 6 jointly, and the monitoring signal through storage tank pressure monitor 2, jar group oil gas collecting pipe pressure monitor 5 or pressure difference monitor 10 controls closing of discharge valve 6.
The opening of the exhaust valve 6 is to open the exhaust valve 6 and exhaust the storage tank to the oil gas main pipe 8 when the storage tank pressure monitor 2 monitors that the storage tank pressure and the main pipe pressure monitored by the tank group oil gas main pipe pressure monitor 5 both reach the opening pressure set value of the exhaust valve 6 and the pressure difference monitor 10 monitors that the pressure difference before and after the exhaust valve 6 is not less than 0.
And the closing of the exhaust valve 6 is to close the exhaust valve 6 when the storage tank pressure monitor 2 monitors the storage tank pressure or the tank group oil and gas collecting pipe pressure monitor 5 monitors that the main pipe pressure is lower than the closing pressure set value of the exhaust valve 6, or the differential pressure monitor 10 monitors that the differential pressure before and after the exhaust valve 6 is less than 0, and the storage tank stops exhausting gas to the oil and gas collecting pipe 8.
The set value of the opening pressure of the exhaust valve 6 is set to be positive pressure (1-overpressure value of the respiratory valve) -0.1kPa of the respiratory valve, and the set value of the closing pressure of the exhaust valve 6 is greater than the set value of the closing pressure of the nitrogen sealing valve 7.
A nitrogen purging pipeline 23 is further arranged between the open fire equipment 25 and the pressure monitor 21, a nitrogen supplementing control valve 22 is further arranged on the nitrogen purging pipeline 23, and the opening of the nitrogen supplementing control valve 15 is controlled through a detection signal of the pressure monitor 21.
Wherein the opening pressure of the nitrogen supply control valve 15 is 0.2 kPa.
Still respectively be equipped with an air exhaust equipment spark arrester 14 on the pipeline around air exhaust equipment 13 respectively, still be equipped with oil gas branch pipe spark arrester 4 (pipeline detonation type flame arrester) on the oil gas branch pipe 3 of every storage tank, still be equipped with pipe end spark arrester 20 on the urgent blow-down pipe 18, still be equipped with spark arrester 24 on getting into naked light equipment 25 front-tube road, spark arrester 24 is the deflagration type flame arrester who takes temperature monitoring function to install and be less than 50 position department for getting into the ratio of the length of naked light equipment front-tube and pipe diameter.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (22)
1. A safety device of open fire equipment for discharging VOCs (volatile organic compounds) from a storage tank is characterized by comprising a storage tank group (1) for various materials, air extraction equipment (13) and open fire equipment (25); wherein, each storage tank top in the storage tank group (1) is respectively provided with a storage tank pressure monitor (2) and an oil-gas branch pipe (3), the oil-gas branch pipes (3) of a plurality of storage tank tops for storing same or similar materials are respectively connected to a tank group oil-gas collecting pipe (9) of same or similar oil gas, the tank group oil-gas collecting pipes (9) of same or similar oil gas are respectively connected to an oil-gas main pipe (8), the oil-gas main pipe (8) is sequentially connected with an air extraction device (13) and an open fire device (25), a tank group oil gas main pipe pressure monitor (11) and an oxygen content analyzer (12) are sequentially arranged on an oil gas main pipe (8) in front of the air extraction equipment (13), the opening and closing of the air suction device (13) are controlled by the monitoring signal of the tank group oil gas main pipe pressure monitor (11), the air extraction equipment (13) and the cut-off valve (17) are closed in an interlocking way through the detection signal of the oxygen content analyzer (12); each storage tank in the storage tank group (1) is connected with a nitrogen supplement pipeline (26) through a nitrogen seal valve (7), and the opening and closing of the nitrogen seal valve (7) are controlled through monitoring signals of a storage tank pressure monitor (2); a cutoff valve (17) and a pressure monitor (21) are sequentially arranged on a pipeline between the air extraction equipment (13) and the open fire equipment (25), an emergency vent pipe (18) is arranged on the pipeline between the cutoff valve (17) and the air extraction equipment (13), a control valve (19) is arranged on the emergency vent pipe (18), and the cutoff valve (17) is controlled to be closed and the control valve (19) is controlled to be opened in an interlocking mode through monitoring signals of the pressure monitor (21);
when the pressure monitor (21) monitors that the pressure in a pipeline in front of the open fire equipment (25) is lower than 0.5-5kPa, the interlocking control cut-off valve (17) is closed and the control valve (19) is opened, so that the VOCs are stopped from being conveyed to the open fire equipment (25), and meanwhile, the control valve (19) is opened, and accident emptying is carried out through the emergency emptying pipe (18).
2. The safety device for the storage tank VOCs discharging open fire equipment according to claim 1, wherein the air extraction equipment (13) is started to convey VOCs to the open fire equipment (25) when the tank group oil gas main pressure monitor (11) monitors that the pressure in the oil gas main (8) reaches the set value of the starting pressure of the air extraction equipment (13);
and the air extraction equipment (13) is closed, when the pressure monitor (11) of the oil-gas main pipe of the tank group monitors that the pressure in the oil-gas main pipe (8) reaches the set value of the closing pressure of the air extraction equipment (13), the air extraction equipment (13) is closed, and the VOCs are stopped being conveyed to the open fire equipment (25).
3. A safety arrangement for a tank VOCs venting open fire installation as claimed in claim 2, wherein said suction device (13) has an opening pressure setting of 0.6-1.2kPa and said suction device (13) has a closing pressure setting of 0-0.2 kPa.
4. A safety arrangement for a tank VOCs fire venting apparatus as claimed in claim 1, wherein said interlock close bleed device (13) and shut-off valve (17) are adapted to interlock close bleed device (13) and shut-off valve (17) when oxygen content analyzer (12) detects that the oxygen content of VOCs in manifold (8) exceeds oxygen content interlock volume concentration B.
5. The safety apparatus for open fire containment of storage tank VOCs according to claim 4, wherein said oxygen content interlock volume concentration B is between 2% and 8%.
6. The safety device for the open fire equipment for discharging the VOCs in the storage tank is characterized in that the nitrogen sealing valve (7) is opened when the storage tank pressure monitor (2) monitors that the storage tank pressure reaches the opening pressure set value of the nitrogen sealing valve (7), the nitrogen sealing valve (7) is opened, and the nitrogen supplementing pipeline (26) supplements nitrogen to the storage tank;
and the closing of the nitrogen sealing valve (7) is to close the nitrogen sealing valve (7) when the storage tank pressure monitor (2) monitors that the storage tank pressure is lower than a closing pressure set value of the nitrogen sealing valve (7), and the nitrogen supplementing pipeline (26) stops the storage tank nitrogen supplementation.
7. A safety arrangement for a tank VOCs emitting open flame equipment according to claim 6, characterized in that the opening pressure setting of the nitrogen sealing valve (7) is 0.1-0.3kPa, and the closing pressure setting of the nitrogen sealing valve (7) is 0.4-0.8 kPa.
8. The safety apparatus for a tank VOCs venting open fire installation of claim 7, wherein said opening pressure set point differs from said closing pressure set point by no less than 0.3 kPa.
9. The safety device for the open fire equipment for discharging the VOCs in the storage tank is characterized in that a nitrogen supplementing pipeline (16) is further arranged on the oil gas main pipe (8) in front of the oxygen content analyzer (12), a nitrogen supplementing control valve (15) is further arranged on the nitrogen supplementing pipeline (16), and the opening of the nitrogen supplementing control valve (15) is controlled through a detection signal of the oxygen content analyzer (12).
10. The safety device for open fire equipment for discharging storage tank VOCs according to claim 9, wherein said nitrogen supplement control valve (15) is opened to supplement nitrogen into the VOCs to reduce the oxygen content below the oxygen content interlock volume concentration a when the oxygen content analyzer (12) detects that the oxygen content in the VOCs in the oil and gas manifold (8) exceeds the oxygen content interlock volume concentration a.
11. The safety apparatus for a storage tank VOCs fire venting apparatus as claimed in claim 10, wherein said oxygen content interlock volume concentration a is in the range of 1-6%.
12. The safety device for the storage tank VOCs open fire discharging equipment is characterized in that a tank group oil and gas collecting pipe pressure monitor (5) and an exhaust valve (6) are further arranged on the tank group oil and gas collecting pipe (9) respectively, a pressure difference monitor (10) is arranged in front of and behind the exhaust valve (6), the opening of the exhaust valve (6) is controlled jointly through monitoring signals of the storage tank pressure monitor (2), the tank group oil and gas collecting pipe pressure monitor (5) and the pressure difference monitor (10), and the closing of the exhaust valve (6) is controlled through monitoring signals of the storage tank pressure monitor (2), the tank group oil and gas collecting pipe pressure monitor (5) or the pressure difference monitor (10).
13. The safety device for the open fire equipment for discharging the VOCs in the storage tank according to claim 12, wherein the exhaust valve (6) is opened when the storage tank pressure monitor (2) monitors that the storage tank pressure and the tank group oil and gas collecting main pipe pressure monitor (5) monitors that the main pipe pressure reaches the opening pressure set value of the exhaust valve (6), and the pressure difference monitor (10) monitors that the pressure difference before and after the exhaust valve (6) is more than or equal to 0, the exhaust valve (6) is opened, and the storage tank exhausts gas to the oil and gas main pipe (8);
and the closing of the exhaust valve (6) is to close the exhaust valve (6) when the storage tank pressure monitor (2) monitors that the storage tank pressure or the tank group oil gas collecting pipe pressure monitor (5) monitors that the main pipe pressure is lower than the closing pressure set value of the exhaust valve (6), or when the differential pressure monitor (10) monitors that the front and back differential pressure of the exhaust valve (6) is less than 0, and the storage tank stops exhausting gas to the oil gas main pipe (8).
14. Safety device for open fire installations for the discharge of VOCs from storage tanks according to claim 13, characterized in that the opening pressure set value of the exhaust valve (6) < positive breathing valve set pressure x (1-breathing valve overpressure value), the closing pressure set value of the exhaust valve (6) > closing pressure set value of the nitrogen seal valve (7).
15. The safety device for the open fire equipment for discharging the VOCs in the storage tank is characterized in that a purging nitrogen pipeline (23) is further arranged between the open fire equipment (25) and the pressure monitor (21), a nitrogen supplementing control valve (22) is further arranged on the purging nitrogen pipeline (23), and the opening of the nitrogen supplementing control valve (15) is controlled through a detection signal of the pressure monitor (21).
16. Safety device for tank VOCs emitting open flame equipment according to claim 15, wherein the pressure of the nitrogen supplement control valve (15) is 0.5-5 kPa.
17. A safety device for open fire equipment for discharging VOCs from storage tanks as claimed in claim 1, wherein a flame arrester (14) is provided in each of the front and rear pipes of the air-extracting device (13).
18. The safety device for the storage tank VOCs open fire discharging equipment is characterized in that an oil-gas branch pipe flame arrester (4) is further arranged on the oil-gas branch pipe (3) of each storage tank.
19. The safety device for open fire equipment for discharging VOCs from a storage tank as claimed in claim 18, wherein the flame arrestor (4) of the branch oil and gas pipe is a pipe detonation type flame arrestor.
20. A safety arrangement for a storage tank VOCs fire safety arrangement as claimed in claim 1, wherein a pipe end fire arrestor (20) is also provided in said emergency evacuation pipe (18).
21. A safety arrangement for open fire installations for the discharge of VOCs from storage tanks according to claim 1, characterized in that a flame arrester (24) is also provided in the piping before entering the open fire installation (25).
22. A safety arrangement for a storage tank VOCs venting open fire device as claimed in claim 21, wherein said flame arrestor (24) is a deflagration type flame arrestor with temperature monitoring capability and is mounted at a location where the ratio of the length of the pipe to the diameter of the pipe before entering the open fire device is less than 50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810148570.3A CN110143380B (en) | 2018-02-13 | 2018-02-13 | Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810148570.3A CN110143380B (en) | 2018-02-13 | 2018-02-13 | Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110143380A CN110143380A (en) | 2019-08-20 |
| CN110143380B true CN110143380B (en) | 2020-12-25 |
Family
ID=67588152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810148570.3A Active CN110143380B (en) | 2018-02-13 | 2018-02-13 | Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110143380B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111167771B (en) * | 2020-02-17 | 2023-06-02 | 青岛诺诚化学品安全科技有限公司 | System and process method for online airtight cleaning and detection of flame arresters |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009120204A (en) * | 2007-11-12 | 2009-06-04 | Taiheiyo Cement Corp | Storing system for low flash point fuel |
| US7762082B1 (en) * | 2003-09-25 | 2010-07-27 | IES Consulting Inc. | Apparatus and method of recovering vapors |
| CN204056865U (en) * | 2014-07-09 | 2014-12-31 | 南京天膜科技股份有限公司 | A kind of full regenerative apparatus of breathing emission gases of nitrogen-sealed storage tank |
| CN106039915A (en) * | 2016-07-20 | 2016-10-26 | 谢玉勋 | Oil and gas recovery device and recovery method thereof |
| CN106241099A (en) * | 2016-07-28 | 2016-12-21 | 中国石油集团东北炼化工程有限公司吉林设计院 | Storage tank volatile organic matter recovery system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106697658B (en) * | 2016-12-21 | 2018-12-11 | 谢玉勋 | Gas of oil storage tank recycles safety control system and its control method |
-
2018
- 2018-02-13 CN CN201810148570.3A patent/CN110143380B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7762082B1 (en) * | 2003-09-25 | 2010-07-27 | IES Consulting Inc. | Apparatus and method of recovering vapors |
| JP2009120204A (en) * | 2007-11-12 | 2009-06-04 | Taiheiyo Cement Corp | Storing system for low flash point fuel |
| CN204056865U (en) * | 2014-07-09 | 2014-12-31 | 南京天膜科技股份有限公司 | A kind of full regenerative apparatus of breathing emission gases of nitrogen-sealed storage tank |
| CN106039915A (en) * | 2016-07-20 | 2016-10-26 | 谢玉勋 | Oil and gas recovery device and recovery method thereof |
| CN106241099A (en) * | 2016-07-28 | 2016-12-21 | 中国石油集团东北炼化工程有限公司吉林设计院 | Storage tank volatile organic matter recovery system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110143380A (en) | 2019-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110160065B (en) | Method for system for safely collecting and discharging low-pressure gas from storage tank VOCs | |
| CN110143379B (en) | Safety device of low-pressure gas system for discharging VOCs (volatile organic compounds) from storage tank | |
| CN110143376B (en) | Zero discharge apparatus is collected to storage tank VOCs safety | |
| CN110143378B (en) | Zero-emission method for safely collecting VOCs (volatile organic compounds) in storage tank | |
| CN110143380B (en) | Safety device of open fire equipment for discharging VOCs (volatile organic compounds) in storage tank | |
| CN216281438U (en) | Dimethyl ether flash distillation waste gas oxidation treatment device | |
| CN108426257A (en) | A kind of industrial waste gas burning processing system | |
| CN208671025U (en) | A kind of industrial waste gas burning processing system | |
| CN113877372A (en) | Multistage absorption negative pressure oxidation treatment device of high concentration dimethyl ether flash distillation waste gas | |
| CN213983002U (en) | VOCs self-adaptation intelligence conveyor | |
| CN110143377B (en) | Safety control method for storage tank VOCs (volatile organic compounds) discharge open fire equipment | |
| CN110155551A (en) | Storage tank VOCs safe collection method | |
| CN105299661B (en) | A kind of processing system and method suitable for rich acetylene torch gas | |
| CN211987887U (en) | Tail gas recovery explosion-proof equipment | |
| CN214635233U (en) | VOCs pipeline transportation and terminal management collaborative fire-proof and explosion-proof process control system | |
| CN213433606U (en) | Coke and asphalt smoke tail gas treatment device | |
| CN113501223A (en) | Recovery and purification device for waste gas in storage tank area | |
| CN214581133U (en) | Thermal oxidation treatment system with safety diffusion function | |
| CN110155552A (en) | Storage tank VOCs safe collection device | |
| CN220689088U (en) | Safety system in waste gas incineration system | |
| CN217329826U (en) | Ground torch system for treating toxic combustible gas | |
| CN212456891U (en) | Tail gas treatment system for multiple polyester production lines | |
| CN210463039U (en) | Movable emptying torch | |
| CN221035767U (en) | Waste gas recovery incineration system | |
| CN110562620B (en) | Safe recovery system and recovery process for VOCs in heavy oil storage tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |