CN113060433A - Gas collection and detection device and method for gas phase space in internal floating roof oil tank - Google Patents
Gas collection and detection device and method for gas phase space in internal floating roof oil tank Download PDFInfo
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- CN113060433A CN113060433A CN202110362597.4A CN202110362597A CN113060433A CN 113060433 A CN113060433 A CN 113060433A CN 202110362597 A CN202110362597 A CN 202110362597A CN 113060433 A CN113060433 A CN 113060433A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1431—Pretreatment by other processes
- B01D53/1437—Pretreatment by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
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- 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
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
- B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0042—Specially adapted to detect a particular component for SO2, SO3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
Abstract
The invention discloses a gas collection and detection device and a gas collection and detection method for a gas phase space in an internal floating roof oil tank, wherein the device comprises an oil storage tank, a floating disc arranged in the oil storage tank, a collection system and a gas treatment system; the gas collection system comprises a sampling pipeline and a first control device, wherein the sampling pipeline is arranged on the floating disc. The gas treatment system comprises a pumping module, a waste gas treatment device, an oil gas recovery device and a second control device. In order to avoid spontaneous combustion fire accidents of corrosion products of a sulfur-containing oil storage tank, the invention discovers spontaneous combustion signs in advance and takes corresponding inhibition measures by arranging the acquisition system and the gas treatment system at the early stage of the oxidation decomposition of the corrosion products, namely the pyrite, and the heat storage phenomenon, so as to achieve the purposes of avoiding accidents and reducing loss. The flame arrester is arranged on the gas collecting pipe and is used for inhibiting flames generated under the condition of accidents of equipment downstream of the gas collecting pipe. The fire retardant core in the flame arrester adopts a corrugated filter core.
Description
Technical Field
The invention belongs to the technical field of sulfur-related oil product storage equipment, and particularly relates to a gas collection and detection device and method for a gas phase space in an internal floating roof oil tank.
Background
The fire problem caused by spontaneous combustion dangerous corrosion products generated in the processes of production, storage and transportation of sulfur-containing oil products is always a difficult problem in petroleum storage and transportation and petrochemical industry. The inner floating roof oil storage tank is one of vertical cylindrical metal oil tanks, and an inner floating disc in the tank body floats on the oil surface, so that the oil product has no evaporation space, and the evaporation loss can be reduced by 85-90%; in addition, air and oil products are separated through the floating disc, so that the air pollution is reduced, and meanwhile, the degree of fire hazard is reduced; finally, because no gas space exists on the oil product, the oscillation generated in the transportation process is reduced, the oil product is prevented from impacting the inner wall of the tank or increasing the internal pressure, the corrosion of the tank top and the tank wall is reduced, and the service life of the storage tank is prolonged, so that a large amount of sulfur-containing oil products are stored in the inner floating top tank in the refinery at present. However, after the internal floating roof oil storage tank is used for a period of time, due to abrasion of the floating disc, the moving parts and the sealing parts, gas phase components of oil gas leak into a space between the floating disc and the tank roof, corrosion products of the storage tank self-ignite, and thus a fire disaster occurs, and the oil storage tank can be exploded, so that safety accidents are caused. The occurrence of the spontaneous combustion fire accident not only can cause casualties and serious equipment property loss, but also can cause secondary disasters such as fire, explosion and the like of adjacent storage tanks in a tank area due to the spread of the fire and the high temperature and high heat action, so that the accident scale and the hazard degree are further enlarged.
The existing gas detection device in the oil tank can not completely isolate the gas detection process which can generate electric sparks in the operation process of equipment from the inside of the oil tank, and basically does not consider the fire hazard of preventing the spontaneous combustion of sulfur and iron compounds which are corrosion products of the wall of the tank. Based on the flammable and explosive characteristics of the crude oil as the storage substance and the electric sparks possibly generated by equipment in the gas detection process, the detection system has certain limitations and potential safety hazards.
Disclosure of Invention
The invention aims to provide a gas collection and detection device and a gas collection and detection method for a gas phase space in an internal floating roof oil tank, and solves the technical problems that in the prior art, most of gas detection devices in the oil tank cannot completely isolate the gas detection process which can generate electric sparks in the operation process of equipment from the inside of the oil tank, and the gas detection devices in the oil tank do not consider the fire hazard for preventing the spontaneous combustion of pyrite serving as a corrosion product of a tank wall.
In order to realize the purpose, the invention adopts the specific technical scheme that:
a gas collection and detection device for a gas phase space in an internal floating roof oil tank comprises an oil storage tank, a floating disc arranged in the oil storage tank, a collection system and a gas treatment system;
the gas collection system comprises a sampling pipeline and a first control device, wherein the sampling pipeline is arranged on the floating disc, a plurality of openings are formed in the sampling pipeline, and the sampling pipeline is communicated with the lower end of the flexible hose; the sampling pipeline and the flexible hose are positioned in a gas phase space at the upper part of the oil storage tank; the upper end of the flexible hose is communicated with the front end of the gas collecting pipe, the gas collecting pipe is positioned outside the oil storage tank, and the front end of the gas collecting pipe is fixedly connected with the top of the oil storage tank; a manual valve, a sampling pump, a flame arrester and a first electric valve are sequentially arranged on the gas collecting pipe from front to back; the first control device comprises a gas buffer tank, a first controller and a man-machine control display screen, wherein the gas buffer tank, the first controller and the man-machine control display screen are arranged in the first box body; the sampling pump, the flame arrester, the first electric valve pressure transmitter, the sulfur dioxide gas detection and man-machine control display screen are electrically connected with the first controller;
the gas treatment system comprises an air extraction module, a waste gas treatment device, an oil gas recovery device and a second control device, wherein the air extraction module comprises a second electric valve, an oil gas vacuum pump, a first check valve and a third electric valve which are sequentially arranged on an air extraction pipeline from front to back; the front end of the air extraction pipeline is communicated with a gas phase space at the upper part of the oil storage tank, the tail end of the air extraction pipeline is communicated with a waste gas treatment device, and the waste gas treatment device is communicated with the oil gas recovery device through a pipeline; the second control device comprises a power cabinet and a second controller arranged on the power cabinet, and the second electric valve, the oil-gas vacuum pump and the third electric valve are all electrically connected with the second controller;
the tail end of the gas buffer tank is communicated with a waste gas treatment device through a gas treatment pipeline, and a fourth electric valve and a second check valve are arranged on the gas treatment pipeline; the fourth electric valve is electrically connected with the first controller;
the first controller and the second controller are electrically connected through a cable.
In order to avoid spontaneous combustion fire accidents of corrosion products of a sulfur-containing oil storage tank, the invention discovers spontaneous combustion signs in advance and takes corresponding inhibition measures by arranging the acquisition system and the gas treatment system at the early stage of the oxidation decomposition of the corrosion products, namely the pyrite, and the heat storage phenomenon, so as to achieve the purposes of avoiding accidents and reducing loss.
The flame arrester is arranged on the gas collecting pipe and is used for inhibiting flames generated under the condition of accidents of equipment downstream of the gas collecting pipe. The fire retardant core in the flame arrester adopts a corrugated filter core.
The flexible hose can move along with the shaking of the floating plate, the adaptability is good, and the flexible hose is made of PVC-O materials, so that the high strength, rigidity and toughness are provided, and friction fire and electrostatic sparks generated in the process that the flexible hose moves along with the inner floating plate can be prevented.
The sampling pipeline comprises a circular pipeline and three connecting pipes, the circular pipeline is arranged at the upper edge of the inner floating disc, the three connecting pipes are radially and uniformly distributed by taking the circle center of the circular pipeline as the center, one end of each connecting pipe is communicated with the circular pipeline, and the other end of each connecting pipe is communicated with the lower end of the flexible hose through a connector; the circular pipeline is provided with a plurality of holes. The annular pipeline is adopted to collect oil gas leaked from the floating disc sealing ring, so that gas existing in a gas phase space between primary sealing and secondary sealing of the floating disc sealing ring is collected to the maximum extent, and the precision is high.
Further optimization, the number of the air exhaust modules is two, and the two air exhaust modules are connected on the air exhaust pipeline in parallel. The two air extraction modules adopt a 'one-use-one-standby' design to ensure normal work.
Further optimizing, gas acquisition pipe and exhaust pipeline all lay along oil storage tank outer wall top-down, and the oil storage tank bottom outside is provided with the stainless steel support, and first controlling means and second controlling means set up on the stainless steel support.
Further optimize, be provided with the alarm in the first box, the alarm is connected with first controller electricity.
Further optimizing, the waste gas treatment device comprises a dry vacuum pump and an active carbon adsorption tank, wherein the inlet end of the dry vacuum pump is communicated with the tail end of the air exhaust pipeline and the gas treatment pipeline at the tail end of the gas buffer tank through a tee; the outlet end of the dry vacuum pump is communicated with the activated carbon adsorption tank.
Further optimizing, the oil gas recovery device comprises an oil gas vacuum pump and an oil gas absorption tower; the inlet end of the oil-gas vacuum pump is communicated with an outlet of the activated carbon adsorption tank through a pipeline, and the outlet end of the oil-gas vacuum pump is communicated with the oil-gas absorption tower.
The detection and processing method based on the gas collection and detection device for the gas phase space in the internal floating roof oil tank comprises the following steps:
firstly, a manual valve on a gas collecting pipe is in a normally open state, a first controller starts a sampling pump once every certain time, gas existing in a gas phase space on the upper portion of an oil storage tank is extracted through a plurality of holes in a circular pipeline and enters a gas buffer tank through a flexible hose and the gas collecting pipe, a sulfur dioxide gas detector detects the gas concentration of sulfur dioxide in the gas buffer tank, and a detection result is transmitted to a man-machine control display screen through the first controller to be displayed;
step two, the first controller judges whether the detection value of the sulfur dioxide concentration in the step one is larger than a set value:
if the detected value of the sulfur dioxide gas is smaller than the set value, the sulfur dioxide gas is considered to be safe;
if the detected value of the sulfur dioxide gas is larger than the set value, the situation that the sulfur ferrite is oxidized, decomposed and stored heat occurs in the oil storage tank is considered, and spontaneous combustion fire accidents are likely to occur; at the moment, the first controller gives an alarm through the alarm, the first controller controls the fourth electric valve to be opened, the gas buffer tank is discharged into the waste gas treatment device, and the third step is carried out;
step three, the first controller transmits the detection result to a second controller through a cable, the second controller sends an instruction to open the air extraction module, the second electric valve, the oil-gas vacuum pump, the first check valve and the third electric valve start to work, harmful oil gas in a gas phase space at the upper part of the oil storage tank is treated through an exhaust gas treatment device through an air extraction pipeline, and the treated oil gas enters an oil-gas recovery device; and after the oil gas is pumped out for treatment, the air pumping module stops working.
Further optimizing, the waste gas treatment device sucks the gas pumped out by the air pumping module and the gas buffer tank into the activated carbon adsorption tank through a dry vacuum pump, and adsorbs harmful impurity gas in the activated carbon adsorption tank; the oil gas recovery device sucks the processed oil gas into the oil gas absorption tower through the oil gas vacuum pump to complete oil gas recovery.
Further optimization, the first controller starts the sampling pump to work once every 10 minutes, and the sampling pump works for one minute every time.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention aims at improving the defects that the existing gas detection device in the storage tank can not completely isolate the gas detection process which can generate electric sparks from the inside of the oil tank and can not early warn the fire disaster of the spontaneous combustion of the sulfur and iron compounds which are corrosion products of the tank wall in advance, and can eliminate the danger that flammable and explosive oil gas in the storage tank is contacted with the electric sparks which can be generated by the device in the gas collection and detection process.
2. The annular pipeline with holes at the periphery is arranged at the upper edge of the floating disc, so that gas existing in a gas phase space between the primary seal and the secondary seal of the sealing ring of the floating disc is collected to the maximum extent, and heat storage spontaneous combustion accidents caused by oxidative decomposition of a corrosion product, namely a pyrite, on the inner wall of the storage tank are effectively prevented.
Drawings
Fig. 1 is a schematic structural diagram of a gas collection and detection device for a gas phase space in an internal floating roof oil tank.
FIG. 2 is a top view of the upper annular conduit of the floating plate of the internal floating roof tank of the present invention.
FIG. 3 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, the gas collection and detection device for the gas phase space in the internal floating roof oil tank comprises an oil storage tank 3 and a floating disc 31 arranged in the oil storage tank, wherein the floating disc 31 is provided with a breather valve 2, and further comprises a collection system and a gas treatment system.
The gas collection system comprises a sampling pipeline 4 and a first control device, wherein the sampling pipeline 4 is arranged on the floating disc 31, a plurality of open holes 5 are formed in the sampling pipeline, and the sampling pipeline 4 is communicated with the lower end of the flexible hose 7; the sampling pipeline 4 and the flexible hose 7 are positioned in the gas phase space at the upper part of the oil storage tank; the upper end of the flexible hose 7 is communicated with the front end of the gas collecting pipe 8, the gas collecting pipe is positioned outside the oil storage tank 3, and the front end of the gas collecting pipe is fixedly connected with the top of the oil storage tank; the gas collecting pipe is sequentially provided with a manual valve 9, a sampling pump 10, a flame arrester 17 and a first electric valve 11-1 from front to back; the first control device comprises a gas buffer tank 20 arranged in a first box body 22, a first controller and a man-machine control display screen 21, wherein a pressure transmitter 19 and a sulfur dioxide gas detector 18 are arranged on a tank body of the gas buffer tank 20, and the tail end of a gas collecting pipe 8 is communicated with the gas buffer tank; the sampling pump 10, the flame arrester 17, the first electric valve 11-1, the pressure transmitter 19, the sulfur dioxide gas detection 18 and the man-machine control display screen 21 are all electrically connected with the first controller.
The gas treatment system comprises an air extraction module 14, a waste gas treatment device 15, an oil gas recovery device 16 and a second control device, wherein the air extraction module 14 comprises a second electric valve 11-2, an oil gas vacuum pump 12, a first check valve 13-1 and a third electric valve 11-3 which are sequentially arranged on an air extraction pipeline 30 from front to back; the front end of the air extraction pipeline 30 is communicated with the gas phase space at the upper part of the oil storage tank 3, the tail end of the air extraction pipeline is communicated with the waste gas treatment device 15, and the waste gas treatment device 15 is communicated with the oil gas recovery device 16 through a pipeline; the second control device comprises a power supply cabinet 23 and a second controller arranged in the power supply cabinet, and the second electric valve 11-2, the oil-gas vacuum pump 12 and the third electric valve 11-3 are all electrically connected with the second controller.
The tail end of the gas buffer tank 20 is communicated with the waste gas treatment device 15 through a gas treatment pipeline, and a fourth electric valve 11-4 and a second check valve 13-2 are arranged on the gas treatment pipeline; the fourth electric valve 11-4 is electrically connected to the first controller.
The first controller and the second controller are electrically connected through a cable.
In order to avoid spontaneous combustion fire accidents of corrosion products of a sulfur-containing oil storage tank, the invention discovers spontaneous combustion signs in advance and takes corresponding inhibition measures by arranging the acquisition system and the gas treatment system at the early stage of the oxidation decomposition of the corrosion products, namely the pyrite, and the heat storage phenomenon, so as to achieve the purposes of avoiding accidents and reducing loss.
The flame arrester is arranged on the gas collecting pipe and is used for inhibiting flames generated under the condition of accidents of equipment downstream of the gas collecting pipe. The fire retardant core in the flame arrester adopts a corrugated filter core.
The flexible hose can move along with the shaking of the floating plate, the adaptability is good, and the flexible hose is made of PVC-O materials, so that the high strength, rigidity and toughness are provided, and friction fire and electrostatic sparks generated in the process that the flexible hose moves along with the inner floating plate can be prevented.
In this embodiment, the sampling pipeline 4 includes a circular pipeline 41 and three connecting pipes 42, the circular pipeline 41 is arranged at the upper edge of the inner floating plate, the three connecting pipes 42 are radially and uniformly distributed around the center of the circular pipeline 41, one end of each connecting pipe 42 is communicated with the circular pipeline 41, and the other end is communicated with the lower end of the flexible hose 7 through the connector 6; the circular pipe 41 is provided with a plurality of holes 5. The annular pipeline is adopted to collect oil gas leaked from the floating disc sealing ring, so that gas existing in a gas phase space between the primary sealing and the secondary sealing of the floating disc sealing ring 1 is collected to the maximum extent, and the precision is high.
In this embodiment, there are two air extraction modules 14, and the two air extraction modules are connected in parallel to the air extraction pipeline. The two air extraction modules adopt a 'one-use-one-standby' design to ensure normal work.
In this embodiment, the gas collection pipe 8 and the air extraction pipeline 30 are both arranged from top to bottom along the outer wall of the oil storage tank, a stainless steel bracket is arranged on the outer side of the bottom of the oil storage tank, and the first control device and the second control device are arranged on the stainless steel bracket.
In this embodiment, an audible and visual alarm is arranged in the first box body, and the alarm is electrically connected with the first controller.
In the embodiment, the detection range of the pressure transmitter attached to the tank body of the gas buffer tank is-100 kPa to 0 kPa. The oil gas vacuum pump adopts a roots vacuum pump, and the parameters of the pump are determined according to the gas collection rate required by specific working conditions.
In this embodiment, the exhaust gas treatment device 15 includes a dry vacuum pump and an activated carbon adsorption tank, and an inlet end of the dry vacuum pump is communicated with a gas treatment pipeline at the tail end of the gas extraction pipeline and the tail end of the gas buffer tank through a tee; the outlet end of the dry vacuum pump is communicated with the activated carbon adsorption tank.
In this embodiment, the oil gas recovery device comprises an oil gas vacuum pump and an oil gas absorption tower; the inlet end of the oil-gas vacuum pump is communicated with an outlet of the activated carbon adsorption tank through a pipeline, and the outlet end of the oil-gas vacuum pump is communicated with the oil-gas absorption tower.
Example two:
the detection and processing method based on the gas collection and detection device for the gas phase space in the internal floating roof oil tank comprises the following steps:
step one, the manual valve 9 on the gas collecting pipe is in a normally open state, the first controller starts the sampling pump 10 and the first electric valve 11-1 once every 10 minutes, and the sampling pump and the first electric valve work for one minute each time. After the gas storage tank is opened, gas existing in a gas phase space at the upper part of the oil storage tank is extracted through a plurality of holes 5 on the circular pipeline 4 and enters a gas buffer tank 20 through a flexible hose 7 and a gas collecting pipe, a sulfur dioxide gas detector 18 detects the gas concentration of sulfur dioxide in the gas buffer tank, and a detection result is transmitted to a man-machine control display screen 21 through a first controller to be displayed;
step two, the first controller judges whether the detection value of the sulfur dioxide concentration in the step one is larger than a set value:
if the detected value of the sulfur dioxide gas is smaller than the set value, the sulfur dioxide gas is considered to be safe;
if the detected value of the sulfur dioxide gas is larger than the set value, the situation that the sulfur ferrite is oxidized, decomposed and stored heat occurs in the oil storage tank is considered, and spontaneous combustion fire accidents are likely to occur; at the moment, the first controller gives an alarm through the alarm, the first controller controls the fourth electric valve to be opened, the gas buffer tank is discharged into the waste gas treatment device 15, and the third step is carried out;
step three, the first controller transmits the detection result to a second controller through a cable, the second controller sends an instruction to open the air extraction module 14, the second electric valve, the oil-gas vacuum pump, the first check valve and the third electric valve start to work, harmful oil gas in the gas phase space at the upper part of the oil storage tank is extracted through an air extraction pipeline, the oil gas extracted by the air extraction module 14 is processed through a waste gas processing device 15, and the processed oil gas enters an oil-gas recovery device 16; and after the oil gas is pumped out for treatment, the air pumping module stops working.
In this embodiment, the exhaust gas treatment device 15 sucks the gas pumped by the pumping module and the gas buffer tank into the activated carbon adsorption tank through the dry vacuum pump, so as to adsorb the harmful impurity gas therein; the oil gas recovery device 16 sucks the processed oil gas into the oil gas absorption tower through an oil gas vacuum pump to complete oil gas recovery.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A gas collection and detection device for a gas phase space in an internal floating roof oil tank comprises an oil storage tank and a floating disc arranged in the oil storage tank, and is characterized by further comprising a collection system and a gas treatment system;
the gas collection system comprises a sampling pipeline and a first control device, wherein the sampling pipeline is arranged on the floating disc, a plurality of openings are formed in the sampling pipeline, and the sampling pipeline is communicated with the lower end of the flexible hose; the sampling pipeline and the flexible hose are positioned in a gas phase space at the upper part of the oil storage tank; the upper end of the flexible hose is communicated with the front end of the gas collecting pipe, the gas collecting pipe is positioned outside the oil storage tank, and the front end of the gas collecting pipe is fixedly connected with the top of the oil storage tank; a manual valve, a sampling pump, a flame arrester and a first electric valve are sequentially arranged on the gas collecting pipe from front to back; the first control device comprises a gas buffer tank, a first controller and a man-machine control display screen, wherein the gas buffer tank, the first controller and the man-machine control display screen are arranged in the first box body; the sampling pump, the flame arrester, the first electric valve pressure transmitter, the sulfur dioxide gas detection and man-machine control display screen are electrically connected with the first controller;
the gas treatment system comprises an air extraction module, a waste gas treatment device, an oil gas recovery device and a second control device, wherein the air extraction module comprises a second electric valve, an oil gas vacuum pump, a first check valve and a third electric valve which are sequentially arranged on an air extraction pipeline from front to back; the front end of the air extraction pipeline is communicated with a gas phase space at the upper part of the oil storage tank, the tail end of the air extraction pipeline is communicated with a waste gas treatment device, and the waste gas treatment device is communicated with the oil gas recovery device through a pipeline; the second control device comprises a power cabinet and a second controller arranged on the power cabinet, and the second electric valve, the oil-gas vacuum pump and the third electric valve are all electrically connected with the second controller;
the tail end of the gas buffer tank is communicated with a waste gas treatment device through a gas treatment pipeline, and a fourth electric valve and a second check valve are arranged on the gas treatment pipeline; the fourth electric valve is electrically connected with the first controller;
the first controller and the second controller are electrically connected through a cable.
2. The gas collection and detection device for the gas phase space in the internal floating roof oil tank is characterized in that the sampling pipeline comprises a circular pipeline and three connecting pipes, the circular pipeline is arranged at the upper edge of the internal floating plate, the three connecting pipes are radially and uniformly distributed by taking the circle center of the circular pipeline as the center, one end of each connecting pipe is communicated with the circular pipeline, and the other end of each connecting pipe is communicated with the lower end of the flexible hose through a connector; the circular pipeline is provided with a plurality of holes.
3. The gas collection and detection device for the gas phase space in the internal floating roof tank is characterized in that the number of the air exhaust modules is two, and the two air exhaust modules are connected to the air exhaust pipeline in parallel.
4. The gas collection and detection device for the gas phase space in the internal floating roof tank as claimed in claim 1, wherein the gas collection pipe and the air exhaust pipeline are arranged from top to bottom along the outer wall of the oil storage tank, a stainless steel bracket is arranged on the outer side of the bottom of the oil storage tank, and the first control device and the second control device are arranged on the stainless steel bracket.
5. The gas collection and detection device for the gas phase space in the internal floating roof oil tank is characterized in that an alarm is arranged in the first tank body and is electrically connected with the first controller.
6. The gas collection and detection device for the gas phase space in the internal floating roof oil tank is characterized in that the waste gas treatment device comprises a dry vacuum pump and an activated carbon adsorption tank, wherein the inlet end of the dry vacuum pump is communicated with a gas treatment pipeline at the tail end of an air exhaust pipeline and the tail end of a gas buffer tank through a tee joint; the outlet end of the dry vacuum pump is communicated with the activated carbon adsorption tank.
7. The gas collection and detection device for the gas phase space in the internal floating roof oil tank as claimed in claim 6, wherein the oil gas recovery device comprises an oil gas vacuum pump and an oil gas absorption tower;
the inlet end of the oil-gas vacuum pump is communicated with an outlet of the activated carbon adsorption tank through a pipeline, and the outlet end of the oil-gas vacuum pump is communicated with the oil-gas absorption tower.
8. A detection and processing method based on the gas collection and detection device for the gas phase space in the internal floating roof oil tank of any one of claims 1 to 7 is characterized by comprising the following steps:
firstly, a manual valve on a gas collecting pipe is in a normally open state, a first controller starts a sampling pump once every certain time, gas existing in a gas phase space on the upper portion of an oil storage tank is extracted through a plurality of holes in a circular pipeline and enters a gas buffer tank through a flexible hose and the gas collecting pipe, a sulfur dioxide gas detector detects the gas concentration of sulfur dioxide in the gas buffer tank, and a detection result is transmitted to a man-machine control display screen through the first controller to be displayed;
step two, the first controller judges whether the detection value of the sulfur dioxide concentration in the step one is larger than a set value:
if the detected value of the sulfur dioxide gas is smaller than the set value, the sulfur dioxide gas is considered to be safe;
if the detected value of the sulfur dioxide gas is larger than the set value, the situation that the sulfur ferrite is oxidized, decomposed and stored heat occurs in the oil storage tank is considered, and spontaneous combustion fire accidents are likely to occur; at the moment, the first controller gives an alarm through the alarm, the first controller controls the fourth electric valve to be opened, the gas buffer tank is discharged into the waste gas treatment device, and the third step is carried out;
step three, the first controller transmits the detection result to a second controller through a cable, the second controller sends an instruction to open the air extraction module, the second electric valve, the oil-gas vacuum pump, the first check valve and the third electric valve start to work, harmful oil gas in a gas phase space at the upper part of the oil storage tank is treated through an exhaust gas treatment device through an air extraction pipeline, and the treated oil gas enters an oil-gas recovery device; and after the oil gas is pumped out for treatment, the air pumping module stops working.
9. The detection and treatment method according to claim 8, wherein the exhaust gas treatment device sucks the gas pumped out by the air pumping module and the gas buffer tank into the activated carbon adsorption tank through a dry vacuum pump, and adsorbs harmful impurity gases in the activated carbon adsorption tank; the oil gas recovery device sucks the processed oil gas into the oil gas absorption tower through the oil gas vacuum pump to complete oil gas recovery.
10. The method for detecting and processing according to claim 8, wherein the first controller turns on the sampling pump to operate once every 10 minutes, and once every minute.
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