CN110562621B - Light oil storage tank VOCs recovery system and recovery process - Google Patents
Light oil storage tank VOCs recovery system and recovery process Download PDFInfo
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- CN110562621B CN110562621B CN201810571473.5A CN201810571473A CN110562621B CN 110562621 B CN110562621 B CN 110562621B CN 201810571473 A CN201810571473 A CN 201810571473A CN 110562621 B CN110562621 B CN 110562621B
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- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000007789 gas Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- 239000000110 cooling liquid Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 34
- 230000003584 silencer Effects 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 12
- 239000013589 supplement Substances 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 7
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
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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
- B01D53/002—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 condensation
-
- 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
- B65D90/30—Recovery of escaped vapours
-
- 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
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
-
- 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
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention discloses a safe recovery system and a safe recovery process for VOCs in a light oil storage tank, and belongs to the technical field of petrochemical engineering environmental protection treatment. The device comprises a first light oil storage tank, a second light oil storage tank, a first air suction water cooler, a second air suction water cooler, a first air suction cooling liquid window and a second air suction cooling liquid window, wherein an air suction fan is connected to an air outlet of the first light oil storage tank through a first pipeline; the air suction fan is also connected with a heating furnace burner, and the oil-containing mixed gas and the air mixed gas pumped out by the air suction fan are introduced into the heating furnace burner for incineration. The invention can prevent the pollution of the volatilization of the organic gas to the environment, ensure the safety and reliability of the recovery process and hardly consume nitrogen when in normal operation.
Description
Technical Field
The invention relates to the technical field of petrochemical engineering environmental protection treatment, in particular to a light oil storage tank VOCs recovery system and a recovery process.
Background
The design specification of vertical cylindrical steel welded oil tanks (GB50341-2014) stipulates that the operating pressure range of a fixed roof oil tank is-0.295-18 KPa. The conventional breather valve at the top of the light oil storage tank is directly discharged to the air, and when the pressure of the storage tank is higher than 18KPa, the breather valve is opened to discharge the oil-containing mixed gas in the gas phase space of the storage tank to the air, thereby causing environmental pollution. When the pressure of the storage tank is lower than-0.295 KPa, the breather valve is opened to inhale inwards; in order to ensure that air does not enter the storage tank to form a negative pressure state and generate explosive gas, the storage tank is provided with a nitrogen supplementing valve group. However, excessive nitrogen gas is supplied to the reaction chamber, resulting in a large amount of nitrogen gas being wasted.
In view of the above technical problems in the prior art, researchers have made relevant studies and made certain progress. If 201120095334 discloses a normal pressure storage tank nitrogen protection device, including normal pressure jar, nitrogen gas and nitrogen sealing cylinder, pressure sensor is installed at normal pressure storage tank top, and it is connected with two solenoid valves through the controller, guarantees the stability of nitrogen gas in the normal pressure storage tank. 201410613961 discloses a method for protecting a storage tank by pumping out the gas from the storage tank by a compressor and storing the gas in a buffer tank under pressure as a protective gas for later use. When the gas in the buffer tank does not meet the positive pressure protection of each storage tank, nitrogen from a nitrogen inlet pipeline is used for supplementing, and when the pressure in the buffer tank exceeds the designed pressure, redundant gas is treated by a flare or an incinerator.
The above prior art has a large consumption of nitrogen and a large dependence on the pressure sensor, and once the pressure sensor fails, the operation of the storage tank beyond the pressure range may occur.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention firstly provides a light oil storage tank VOCs safe recovery system which can prevent organic gas from volatilizing to pollute the environment, ensure the safety and reliability of the recovery process and hardly consume nitrogen when in normal operation.
The technical solution comprises:
a light oil storage tank VOCs safe recovery system comprises a light oil storage tank I, a light oil storage tank II, an air suction water cooler I, an air suction water cooler II, an air suction cooling liquid window I and an air suction cooling liquid window II, wherein an air exhaust port of the light oil storage tank I is connected with an air suction fan through a first pipeline;
the air suction fan is also connected with a heating furnace burner, and the oil-containing mixed gas and the air mixed gas pumped out by the air suction fan are introduced into the heating furnace burner for incineration;
an exhaust port of the second light oil storage tank is connected with the air suction fan through a third pipeline, the second air suction water cooler is installed on the third pipeline and used for cooling the mixed gas, and cooling liquid cooled by the second air suction water cooler is introduced into the underground sump oil tank through a fourth pipeline connected with the second air suction water cooler;
a first breather valve and a first air suction port silencer are respectively arranged on the first pipeline, and an air suction cooling liquid window I is arranged on the second pipeline, wherein the first breather valve is close to an air discharge port of the light oil storage tank I;
and a second breather valve and a second air suction port silencer are respectively arranged on the third pipeline, and an air suction cooling liquid window II is arranged on the fourth pipeline, wherein the second breather valve is close to an exhaust port of the first light oil storage tank.
As a preferable scheme of the invention, a first air suction inlet valve and a first air suction fan inlet main valve are sequentially arranged on a first pipeline between the first air suction water cooler and the air suction fan, and an air suction fan outlet one-way valve and an air suction fan outlet main valve are sequentially arranged between the air suction fan and the burner of the heating furnace.
As another preferable scheme of the invention, a flame arrester is further arranged between the suction fan and the heating furnace burner.
Preferably, the device further comprises a plant wind blowing device, wherein the plant wind blowing device is connected with the first pipeline, the second pipeline, the third pipeline and the fourth pipeline and used for dredging and blowing the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.
Further, the factory wind sweeps the device and is connected to respectively through the trunk line first pipeline, second pipeline intersection and third pipeline, fourth pipeline intersection, be provided with factory wind main valve, factory wind rotor flow meter, factory wind check valve on the trunk line be provided with first inspiration mouth purge valve between trunk line and first pipeline, the second pipeline the trunk line with be provided with the second between third pipeline, the fourth pipeline and inhale the mouth purge valve.
Furthermore, the first light oil storage tank and the second light oil storage tank are both connected with a nitrogen supply device, and when the pressure in the first light oil storage tank and the pressure in the second light oil storage tank are lower than-0.2 KPa, the nitrogen supply device is started to supplement nitrogen.
The invention also aims to provide a safe recovery process of the light oil storage tank VOCs, and the safe recovery system of the light oil storage tank VOCs comprises the following steps:
a, starting an air suction fan, wherein when the air suction fan sucks air through an air suction port directly communicated with the atmosphere, a first pipeline and a third pipeline communicated with the air suction fan are in a micro-negative pressure state, and meanwhile, the pressure in a light oil storage tank I and the pressure in a light oil storage tank II are also in a micro-negative pressure state;
b, along with the operation of the air suction fan, organic gas in the first light oil storage tank and the second light oil storage tank respectively enters the first air suction water cooler and the second air suction water cooler through the first pipeline and the third pipeline, oil-containing mixed gas volatilized by the first light oil storage tank and the second light oil storage tank, air mixture entering a system and air entering through an air suction port are mixed together, part of mixed gas is formed into condensate under the action of the first air suction water cooler and the second air suction water cooler, and the condensate respectively enters the underground sump oil tank through the second pipeline and the fourth pipeline;
and c, sending the mixed gas of the light oil and the air at the outlet of the air suction fan into a burner of the heating furnace for incineration.
Furthermore, the flow direction of the cooled light oil product is observed through the first air suction cooling liquid window and the second air suction cooling liquid window.
Furthermore, the first air inlet silencer and the second air inlet silencer can ensure that the aerodynamic noise is less than 60 decibels.
Further, the working pressure of the first light oil storage tank and the second light oil storage tank is kept between-0.2 KPa and-0.1 KPa.
The beneficial technical effects brought by the invention are as follows:
compared with the prior art, the invention directly keeps the light oil product storage tank to operate at the micro negative pressure (-0.2 to-0.1 KPa) through the designed air extractor and the fan, all volatile organic gases can not enter the atmosphere, thus realizing the essential environmental protection; the design of the air extractor keeps the light oil product storage tank to operate under the micro negative pressure (-0.2 to-0.1 KPa), so that the safety risk of the storage tank caused by over depending on a pressure sensor to supplement gas can be prevented, the air entering the storage tank is ensured to be above the upper explosion limit after being mixed with oil gas, and the intrinsic safety is realized; the outlet of the fan directly enters the inlet of the blower of the heating furnace or a burner for burning, the existing equipment and facilities of the device are fully utilized, the investment is not increased, and the treatment effect is better than that of the conventional oil gas recovery device; during normal operation, media such as nitrogen and the like do not need to be supplemented, and the aim of saving nitrogen consumption is fulfilled; the device is provided with a factory air blowing facility, so that the device can be used for dredging and blowing when the pipeline is blocked.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a flow diagram of the recovery process of the present invention;
in the figure: 1. the device comprises a first light oil storage tank, a second light oil storage tank, a third light oil storage tank, a first nitrogen sealing valve group, a second nitrogen sealing valve group, a third nitrogen sealing valve group, a fourth nitrogen sealing valve group, a fifth breathing valve group, a sixth breathing water cooler group, a fifth breathing water cooler group, a sixth breathing water cooler group, 11, a fifth breathing cooling liquid window group, 12, a sixth breathing cooling liquid window group, 13, a sixth breathing inlet valve group, a fifth breathing inlet valve group, 14, a sixth breathing inlet valve group, a sixth breathing fan inlet main valve group, 16, a breathing fan inlet, a 17, a fifth breathing fan outlet one-way valve, 18, a breathing fan outlet main valve, a 19, a flame arrester, 20, a factory air main valve, a factory air main air valve, a 21, a factory air flow meter, a factory air rotor, a factory air flow meter, 22, a factory air one-way valve, a 23, a factory air inlet one-way valve, a first nitrogen sealing valve, a second air inlet, a nitrogen sealing valve, a second air inlet, a nitrogen sealing valve, a second air inlet valve, a 6, a second breathing valve, a second breathing air inlet, a second breathing valve, a breathing air inlet, a breathing valve, a second breathing air inlet, a second breathing valve, a second breathing air inlet valve, a second breathing valve, a breathing air inlet, a second breathing valve, a second, a 13, a first breathing valve, a second breathing valve, a second, a breathing valve, a second breathing air inlet, a second breathing valve, a breathing valve.
Detailed Description
The invention provides a light oil storage tank VOCs safe recovery system and a recovery process, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail with reference to specific embodiments.
As shown in fig. 1, the system for safely recovering VOCs in a light oil storage tank of the present invention includes a first light oil storage tank 1, a second light oil storage tank 2, a first inspiration water cooler 9, a second inspiration water cooler 10, a first inspiration coolant window 11, a second inspiration coolant window 12, a first breather valve 5, a second breather valve 6, a first inspiration port silencer 7, a second inspiration port silencer 8, an inspiration fan 16, and a flame arrester 19.
The exhaust port of the light oil storage tank 1 is connected with the air suction fan 16 through a first pipeline, the volatile gas of the light oil is mostly C3-C8 components and is in a gas state at normal temperature, and in order to prevent the light oil from being recycled to the maximum degree, the first pipeline is provided with an air suction water cooler 9 and an air suction water cooler 10. And the cooled light oil product is discharged to an underground sump oil tank through the air suction cooling liquid window I, the air suction cooling liquid window II and the liquid discharge valve, so that centralized recovery is realized.
The air extractor is directly communicated with the atmosphere, and the size of the air extractor is specially designed, so that the pressure is not lower than-0.295 KPa, the storage tank cannot be deflated, the mixed gas of a small amount of air and oil gas entering the gas phase space of the storage tank is higher than the upper limit of the explosion limit range, and the explosion risk is avoided; because the first air suction inlet silencer 7 and the second air suction inlet silencer 8 are arranged at the inlet of the air extraction device, the aerodynamic noise of the air extraction device can be guaranteed not to be more than 60db, and therefore noise pollution can not be caused.
The air suction fan is connected with a heating furnace burner, and the gas pumped out by the air suction fan is introduced into the heating furnace burner for incineration; and an exhaust port of the second light oil storage tank is connected with an air suction fan through a third pipeline, a second air suction water cooler is arranged on the third pipeline, a second air suction water cooler 10 is used for cooling the mixed gas, and the light oil product cooled by the second air suction water cooler is introduced into the underground sump oil tank through a fourth pipeline connected with the light oil product.
In order to facilitate the operation and control of the system, a plurality of process pipe fittings are arranged on corresponding pipelines, for example, preferably, a first breather valve 5, a first air suction port silencer 7 and a first air suction cooling liquid window are respectively arranged on a first pipeline, wherein the first breather valve is close to an air outlet of the first light oil storage tank; and a second breather valve, a second air suction port silencer and a second air suction cooling liquid window are respectively arranged on the third pipeline, wherein the second breather valve is close to an exhaust port of the second light oil storage tank. Preferably, a first air suction inlet valve 13 and an air suction fan inlet main valve 15 are sequentially arranged on a first pipeline between the first air suction water cooler and the air suction fan, and an air suction fan outlet one-way valve 17 and an air suction fan outlet main valve 18 are sequentially arranged between the air suction fan and the burner of the heating furnace. A second suction inlet valve 14 is provided in the third conduit between the suction water cooler and the suction fan.
A flame arrester is further arranged between the air suction fan and the heating furnace burner, so that potential safety hazards are reduced.
The system is also provided with a factory air sweeping facility, so that dredging and sweeping can be ensured when the pipeline is slightly blocked. The specific plant air blowing device is connected with the first pipeline, the second pipeline, the third pipeline and the fourth pipeline and used for dredging and blowing the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.
Factory wind sweeps device and is connected to first pipeline, second pipeline intersection and third pipeline, fourth pipeline intersection respectively through the trunk line, is provided with factory wind main valve 20, factory wind rotor flow meter 21, factory wind check valve 22 on the trunk line be provided with first inspiration mouth purge valve 23 between trunk line and first pipeline, the second pipeline the trunk line with be provided with the second between third pipeline, the fourth pipeline and inhale the mouth purge valve 24.
In normal operation, the invention does not need to supplement nitrogen and other media; when the gas phase conditions of sudden drop in air temperature such as rainstorm and the like occur and the pressure of the storage tank is lower than-0.2 KPa, the light oil storage tank I1 and the light oil storage tank II 2 are connected with a nitrogen supply device, and a nitrogen sealing valve group I3 and a nitrogen sealing valve group II 4 are arranged on a pipeline between the light oil storage tank I1 and the light oil storage tank II 2; if the pressure continues to drop, the storage tank breather valve is automatically opened to supplement air into the tank, and the supplemental nitrogen is automatically opened.
The present invention will be described in detail with reference to specific examples.
The method comprises the following steps: when the air suction fan 16 sucks air through an air suction device (an air inlet is provided with a first air suction port silencer 7 and a second air suction port silencer 8) which is directly communicated with the atmosphere, outlet pipelines of a light oil storage tank I1 and a light oil storage tank II 2 which are communicated with the air suction fan are in a micro negative pressure state (-0.2 to-0.1 KPa), and the pressure in the light oil storage tank I and the light oil storage tank II is equal to the pressure in the light oil storage tank I and the light oil storage tank II. Therefore, the pressure in the reservoir is also in a slightly negative pressure state. The volatilized organic gas can enter the inlet of the fan with lower pressure, and can not enter the atmosphere disorderly to cause environmental pollution.
Step two: the outlet of the air suction fan 16 enters the inlet of a blower of the heating furnace or a burner for burning, so that the cost is not increased, and the method is safe and reliable. In order to prevent the safety accident caused by backfire, a flame arrester 19 is arranged between the outlet valve of the air extractor and the burner of the heating furnace.
Step three: the volatile gas of the light oil is mostly C3-C8 components, is gaseous at normal temperature, and in order to prevent the maximum recovery light oil, the pipeline between the air extractor and the air extractor is provided with a first air suction water cooler 9 and a second air suction water cooler 10. And the cooled light oil product is discharged to an underground sump oil tank through a first air suction cooling liquid window 11, a second air suction cooling liquid window 12 and a liquid discharge valve which are designed at the bottom of the pipeline, so that centralized recovery is realized.
Step four: during normal operation, the storage tank does not need to supplement media such as nitrogen and the like, and the purpose of saving nitrogen consumption is achieved. Under the conditions of sudden drop of air temperature (such as strong wind and rainy weather), oil supply of the storage tank and the like, sensing the pressure change of the storage tank through a pressure sensor, and automatically opening a nitrogen sealing valve group I3 and a nitrogen sealing valve group II 4 to supplement nitrogen to the storage tank; if the pressure continues to drop, the storage tank breather valve automatically opens to supplement air into the tank, and the pressure of the storage tank is kept stable.
Step five: the system is provided with factory air blowing facilities 20, 21, 22, 23 and 24, and can ensure dredging and blowing when the pipeline is blocked.
The invention relates to a safe recovery process of VOCs in a light oil storage tank, which adopts the recovery system and comprises the following steps:
a, starting an air suction fan, wherein when the air suction fan sucks air through an air suction port directly communicated with the atmosphere, a first pipeline and a third pipeline communicated with the air suction fan are in a micro-negative pressure state, and meanwhile, the pressure in a light oil storage tank I and the pressure in a light oil storage tank II are also in a micro-negative pressure state;
b, along with the operation of the air suction fan, organic gas in the first light oil storage tank and the second light oil storage tank respectively enters the first air suction water cooler and the second air suction water cooler through the first pipeline and the third pipeline, oil-containing mixed gas volatilized by the first light oil storage tank and the second light oil storage tank, air mixture entering a system and air entering through an air suction port are mixed together, part of mixed gas is formed into condensate under the action of the first air suction water cooler and the second air suction water cooler, and the condensate respectively enters the underground sump oil tank through the second pipeline and the fourth pipeline;
and c, sending the mixed gas of the light oil and the air at the outlet of the air suction fan into a burner of the heating furnace for incineration.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
Although terms such as suction fan, light oil storage tank one, suction water cooler one, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a light oil storage tank VOCs safety recovery system, its includes light oil storage tank one, light oil storage tank two, the water cooler one of breathing in, the water cooler two of breathing in, the coolant liquid window one of breathing in and the coolant liquid window two of breathing in, its characterized in that:
an air exhaust port of the first light oil storage tank is connected with an air suction fan through a first pipeline, a first air suction water cooler is arranged on the first pipeline and used for cooling mixed gas, and cooling liquid is introduced into an underground sump oil tank through a second pipeline connected with the first air suction water cooler;
the air suction fan is also connected with a heating furnace burner, and the oil-containing mixed gas and the air mixed gas pumped out by the air suction fan are introduced into the heating furnace burner for incineration;
an exhaust port of the second light oil storage tank is connected with the air suction fan through a third pipeline, the second air suction water cooler is installed on the third pipeline and used for cooling the mixed gas, and cooling liquid cooled by the second air suction water cooler is introduced into the underground sump oil tank through a fourth pipeline connected with the second air suction water cooler;
a first breather valve and a first air suction port silencer are respectively arranged on the first pipeline, and an air suction cooling liquid window I is arranged on the second pipeline, wherein the first breather valve is close to an air discharge port of the light oil storage tank I;
a second breather valve and a second air suction port silencer are respectively arranged on the third pipeline, and an air suction cooling liquid window II is arranged on the fourth pipeline, wherein the second breather valve is close to an air outlet of the light oil storage tank II;
a first air suction inlet valve and a first air suction fan inlet main valve are sequentially arranged on a first pipeline between the first air suction water cooler and the air suction fan, and an air suction fan outlet one-way valve and an air suction fan outlet main valve are sequentially arranged between the air suction fan and the burner of the heating furnace;
the light oil storage tank I and the light oil storage tank II are both connected with a nitrogen supply device, and when the light oil storage tank I and the light oil storage tank II are in a micro-negative pressure state in normal operation, the micro-negative pressure range is-0.2 to-0.1 KPa, and the nitrogen supply device is not required to supplement nitrogen; when the pressure in the light oil storage tank I and the light oil storage tank II is lower than-0.2 KPa, starting the nitrogen supply device to supplement nitrogen;
the device also comprises a plant wind blowing device, wherein the plant wind blowing device is connected with the first pipeline, the second pipeline, the third pipeline and the fourth pipeline and is used for dredging and blowing the first pipeline, the second pipeline, the third pipeline and the fourth pipeline;
the factory wind sweeps the device and is connected to respectively through the trunk line first pipeline, second pipeline intersection and third pipeline, fourth pipeline intersection, be provided with factory wind main valve, factory wind rotor flow meter, factory wind check valve on the trunk line be provided with first inspiration mouth purge valve between trunk line and first pipeline, the second pipeline intersection the trunk line with be provided with the second between third pipeline, the fourth pipeline intersection and inhale the mouth purge valve.
2. The system of claim 1, wherein the system further comprises: and a flame arrester is also arranged between the air suction fan and the heating furnace burner.
3. The safe recovery process of VOCs in the light oil storage tank is characterized by comprising the following steps: the safe recovery system of light oil storage tank VOCs of claim 1 is used, comprising the steps of:
a, starting an air suction fan, wherein when the air suction fan sucks air through an air suction port directly communicated with the atmosphere, a first pipeline and a third pipeline communicated with the air suction fan are in a micro-negative pressure state, and meanwhile, the pressure in a light oil storage tank I and the pressure in a light oil storage tank II are also in a micro-negative pressure state;
b, along with the operation of the air suction fan, organic gas in the first light oil storage tank and the second light oil storage tank respectively enters the first air suction water cooler and the second air suction water cooler through the first pipeline and the third pipeline, oil-containing mixed gas volatilized by the first light oil storage tank and the second light oil storage tank, air mixture entering a system and air entering through an air suction port are mixed together, part of mixed gas is formed into condensate under the action of the first air suction water cooler and the second air suction water cooler, and the condensate respectively enters the underground sump oil tank through the second pipeline and the fourth pipeline;
and c, sending the mixed gas of the light oil and the air at the outlet of the air suction fan into a burner of the heating furnace for incineration.
4. The safe recovery process of VOCs in the light oil storage tank according to claim 3, characterized in that: and observing the flow direction of the cooled light oil through the first air suction cooling liquid window and the second air suction cooling liquid window.
5. The safe recovery process of VOCs in the light oil storage tank according to claim 3, characterized in that: the first air suction silencer and the second air suction silencer can ensure that the aerodynamic noise is less than 60 decibels.
6. The safe recovery process of VOCs in the light oil storage tank according to claim 3, characterized in that: and the working pressure of the first light oil storage tank and the second light oil storage tank is kept between-0.2 KPa and-0.1 KPa.
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