CN110564441B - Safe recovery system and recovery process for VOCs in styrene storage tank - Google Patents
Safe recovery system and recovery process for VOCs in styrene storage tank Download PDFInfo
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- CN110564441B CN110564441B CN201810582872.1A CN201810582872A CN110564441B CN 110564441 B CN110564441 B CN 110564441B CN 201810582872 A CN201810582872 A CN 201810582872A CN 110564441 B CN110564441 B CN 110564441B
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- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 title claims abstract description 195
- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 43
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- 239000000110 cooling liquid Substances 0.000 claims abstract description 23
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 18
- 230000003584 silencer Effects 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 claims 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 230000000621 autoagglutination Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000000694 effects Effects 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G5/00—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas
- C10G5/06—Recovery of liquid hydrocarbon mixtures from gases, e.g. natural gas by cooling or compressing
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Incineration Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a safe recovery system and a safe recovery process for VOCs (volatile organic compounds) in a styrene storage tank, and belongs to the technical field of petrochemical engineering environmental protection treatment. The system comprises a first styrene normal-pressure storage tank, a second styrene normal-pressure storage tank, a first air suction deep cooler, a second air suction deep 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 styrene normal-pressure storage tank through a first pipeline; the air suction fan is also connected with a steam superheater burner, and the mixed gas of the styrene and the air pumped by the air suction fan is introduced into the steam superheater burner for incineration. The invention can prevent the pollution of the volatilization of the styrene 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 system and a process for safely recovering VOCs (volatile organic compounds) of a styrene storage tank.
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 styrene storage tank is directly discharged to the air, and when the pressure of the storage tank is higher than 18KPa, the breather valve opens organic gas containing styrene and the like in the gas phase space of the storage tank and discharges the organic gas into 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, which comprises pumping out the gas from the storage tank by a compressor, storing the gas in a buffer tank under pressure, and using the gas as the protective gas for standby. 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.
However, the above prior art has a large consumption of nitrogen and a large reliance on the pressure sensor, which may cause the tank to operate beyond the pressure range in case of a failure of the pressure sensor.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention firstly provides a safe recovery system for VOCs in a styrene storage tank, which can prevent the pollution of styrene gas volatilization to the environment, ensure the safety and reliability of the recovery process and hardly consume nitrogen in normal operation.
The technical solution comprises:
a styrene storage tank VOCs safe recovery system comprises a first styrene normal pressure storage tank, a second styrene normal pressure storage tank, a first air suction deep cooler, a second air suction deep 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 styrene normal pressure storage tank through a first pipeline;
the air suction fan is also connected with a steam superheater burner, and the mixed gas of the styrene and the air pumped by the air suction fan is introduced into the steam superheater burner for incineration;
the exhaust port of the second styrene normal-pressure storage tank is connected with the air suction fan through a third pipeline, the second air suction chiller is arranged on the third pipeline and used for cooling the mixed gas, and the cooling liquid cooled by the second air suction chiller is introduced into the underground sump oil tank through a fourth pipeline connected with the second air suction chiller;
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 first styrene storage tank;
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 styrene storage tank II.
In a preferred embodiment of the present invention, a first suction inlet valve and a first suction fan inlet main valve are sequentially disposed on a first pipeline between the first suction chiller and the suction fan, and a suction fan outlet check valve and a suction fan outlet main valve are sequentially disposed between the suction fan and the steam superheater burner.
In another preferred embodiment of the present invention, a flame arrester is further disposed between the suction fan and the steam superheater burner.
Preferably, the first air suction chiller and the second air suction chiller both use a lithium bromide refrigerating unit as a cold source, and the lithium bromide refrigerating unit uses system waste heat as a heat source.
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.
Preferably, 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 breathe in the entry purge valve.
Preferably, the first styrene atmospheric storage tank and the second styrene atmospheric storage tank are both connected with a nitrogen supply device, and when the pressure in the first styrene atmospheric storage tank and the pressure in the second styrene atmospheric storage tank are lower than-0.2 KPa, the nitrogen supply device is started to supplement nitrogen.
The second task of the invention is to provide a safe recovery process of VOCs in a styrene 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 first styrene normal-pressure storage tank and a second styrene normal-pressure storage tank is also in a micro-negative pressure state;
b, along with the operation of the air suction fan, organic gases in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank enter a first air suction chiller and a second air suction chiller through a first pipeline and a third pipeline respectively, the styrene gas volatilized by the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank, an air mixture entering a system and air entering the system through an air suction port are mixed together, part of mixed gas forms condensate under the action of the first air suction chiller and the second air suction chiller, and the condensate enters the underground sump oil tank through a second pipeline and a fourth pipeline respectively;
and c, feeding the mixed gas of the styrene and the air at the outlet of the air suction fan into a burner of the steam superheater for incineration.
Furthermore, the flow direction of the condensate 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.
The beneficial technical effects brought by the invention are as follows:
compared with the prior art, the invention directly keeps the styrene normal pressure storage tank to operate at the micro negative pressure through the designed air extractor and the fan, all volatile organic gases cannot enter the atmosphere, and the essential environmental protection is realized; the outlet of the fan directly enters the steam superheater for incineration, the existing equipment and facilities are utilized, the investment is not increased, and the treatment effect is superior to 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 slightly 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 system comprises a first styrene normal-pressure storage tank, 2, a second styrene normal-pressure storage tank, 3, a first nitrogen sealing valve group, 4, a second nitrogen sealing valve group, 5, a first breather valve, 6, a second breather valve, 7, a first air suction port silencer, 8, a second air suction port silencer, 9, a first air suction deep cooler, 10, a second air suction deep cooler, 11, a first air suction cooling liquid window, 12, a second air suction cooling liquid window, 13, a first air suction inlet valve, 14, a second air suction inlet valve, 15, an air suction fan inlet main valve, 16, an air suction fan, 17, an air suction fan outlet one-way valve, 18, an air suction fan outlet main valve, 19, a flame arrester, 20, a factory air main valve, 21, a factory air flow meter rotor, 22, a factory air one-way valve, 23, a first air suction inlet purging valve, 24, a second air suction inlet purging valve, 25 and a lithium bromide refrigerating unit.
Detailed Description
The invention provides a safe recovery system and a recovery process for VOCs in a styrene storage tank, and the invention is described in detail with reference to specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
As shown in fig. 1, the system for safely recycling VOCs in a styrene storage tank of the present invention comprises a first styrene atmospheric storage tank 1, a second styrene atmospheric storage tank 2, a first suction chiller 9, a second suction chiller 10, a first suction coolant window 11, a second suction coolant window 12, a first breather valve 5, a second breather valve 6, a first suction muffler 7, a second suction muffler 8, a suction air 16, and a flame arrester 19.
The exhaust port of the styrene normal-pressure storage tank I2 is connected with an air suction fan 16 through a first pipeline, a first air suction chiller is arranged on the first pipeline and used for cooling the mixed gas, wherein the cooling liquid is introduced into the underground sump oil tank through a second pipeline connected with the first air suction chiller.
The above-mentioned gas mixture mainly means the volatile styrene gas of storage tank, through the sealed air mixture who gets into the system of storage tank and the air that gets into through the extraction opening, considers the easy auto-agglutination's of styrene normal temperature characteristic, uses the refrigerated water of no more than 5 ℃ that lithium bromide refrigerating unit 25 provided to the design of air suction fan entry as the cooler of cold source, cools off the gas mixture, and the coolant liquid gets into the underground sump oil tank of device.
The outlet of the air suction fan is connected with a steam superheater burner, and the mixed gas of the styrene and the air pumped by the air suction fan is introduced into the steam superheater burner for incineration; an exhaust port of the second styrene normal-pressure storage tank is connected with an air suction fan through a third pipeline, a second air suction deep cooler is installed on the third pipeline, a second air suction deep cooler 10 is used for cooling the mixed gas, and cooling liquid cooled by the second air suction deep cooler is introduced into the underground sump oil tank through a fourth pipeline connected with the second air suction deep cooler;
in order to facilitate the operation and control of the system, a plurality of process pipe fittings are arranged on corresponding pipelines, for example, a first breather valve 5, a first air suction port silencer 7 and a first air suction cooling liquid window are preferably arranged on a first pipeline respectively, wherein the first breather valve is close to an air outlet of the first styrene 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 styrene 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 chiller 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 steam superheater burner. A second suction inlet valve 14 is arranged on the third line between the suction chiller two and the suction fan.
And a flame arrester is also arranged between the air suction fan and the steam superheater 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 are met and the pressure of the storage tank is lower than-0.2 KPa, the first styrene normal pressure storage tank 1 and the second styrene normal pressure storage tank 2 are connected with a nitrogen supply device, and a first nitrogen sealing valve group 3 and a second nitrogen sealing valve group 4 are arranged on a pipeline between the first styrene normal pressure storage tank 1 and the second styrene normal pressure storage tank 2, so that the nitrogen is automatically opened and supplemented; if the pressure continues to drop, the storage tank breather valve is automatically opened to supplement air into the tank, and the pressure of the storage tank is kept stable.
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 first breather valve 5 and a second breather valve 6 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 first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank is equal to the pressure in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank. 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. The air extractor is directly communicated with the atmosphere, and the size of the air extractor is specially designed, so that the pressure can be ensured to be-0.2 to-0.1 KPa, and the storage tank cannot be deflated; the first air suction inlet silencer 7 and the second air suction inlet silencer 8 are designed at the inlet of the air extraction device, so that the aerodynamic noise is not more than 60db, and noise pollution is avoided.
Step two: the outlet of the air suction fan 16 enters a burner of a steam superheater of the styrene device for incineration, 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 suction fan and the burner of the steam superheater.
Step three: the styrene monomer has the characteristics of easy auto-agglutination at normal atmospheric temperature, and for preventing the auto-agglutination that causes after the styrene gas condenses between air exhaust device to the air exhaust fan from blockking up the pipeline, the long period running that influences VOCs recovery unit goes out the design at this pipeline and uses the suction chiller 9, the suction chiller two 10 of lithium bromide refrigerating unit as the cold source.
Step four: and the cooled styrene liquid 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 five: the lithium bromide refrigerating unit 25 uses the waste heat of the device as a heat source, and utilizes the strong water absorption of the lithium bromide to realize the deep cooling of the cooling medium, and the temperature of the cooling medium at the outlet of the unit is not more than 5 ℃.
Step six: during normal operation, media such as nitrogen and the like do not need to be supplemented by the nitrogen seal valve group I and the nitrogen seal valve group II, so that the aim of saving nitrogen consumption is fulfilled; in rare cases (such as rainstorm and other gas phase conditions with suddenly dropping air temperature), when the pressure of the storage tank is lower than-0.2 KPa, the first and second nitrogen sealing valve groups are automatically opened to supplement nitrogen; if the pressure is continuously reduced to-0.295 KPa, the breather valve of the storage tank is automatically opened to supplement air into the tank, so that the pressure of the storage tank is kept stable.
Step seven: 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 slightly blocked.
The invention relates to a safe recovery process of VOCs in a styrene 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, meanwhile, the pressure in a first styrene normal-pressure storage tank and a second styrene normal-pressure storage tank is also in a micro-negative pressure state, and volatilized organic gas can enter an inlet of the fan with lower pressure and cannot enter the atmosphere in a disordered manner to cause environmental pollution;
b, along with the operation of the air suction fan, organic gases in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank enter a first air suction chiller and a second air suction chiller through a first pipeline and a third pipeline respectively, the styrene gas volatilized by the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank, an air mixture entering a system and air entering the system through an air suction port are mixed together, part of mixed gas forms condensate under the action of the first air suction chiller and the second air suction chiller, and the condensate enters the underground sump oil tank through a second pipeline and a fourth pipeline respectively;
and c, feeding the mixed gas of the styrene and the air at the outlet of the air suction fan into a burner of the steam superheater 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, styrene atmospheric storage tank one, suction chiller 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 (4)
1. The utility model provides a styrene storage tank VOCs safety recovery system, it includes styrene atmospheric pressure storage tank one, styrene atmospheric pressure storage tank two, the deep cooler one of breathing in, the deep 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 outlet of the first styrene normal-pressure storage tank is connected with an air suction fan through a first pipeline, the air suction fan sucks air through an air suction device directly communicated with the atmosphere, a first air suction port silencer and a second air suction port silencer are arranged at an air inlet of the air suction device, outlet pipelines of a first breather valve and a second breather valve communicated with the air suction fan are in a micro-negative pressure state of-0.2 to-0.1 KPa, and the pressure in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank is equal to the pressure in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank;
the first air suction chiller is arranged on the first pipeline and is used for cooling the mixed gas, and the cooling liquid is introduced into the underground sump oil tank through a second pipeline connected with the first air suction chiller;
the air suction fan is also connected with a steam superheater burner, and the mixed gas of the styrene and the air pumped by the air suction fan is introduced into the steam superheater burner for incineration;
the exhaust port of the second styrene normal-pressure storage tank is connected with the air suction fan through a third pipeline, the second air suction chiller is arranged on the third pipeline and used for cooling the mixed gas, and the cooling liquid cooled by the second air suction chiller is introduced into the underground sump oil tank through a fourth pipeline connected with the second air suction chiller;
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 first styrene normal-pressure storage tank;
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 styrene normal-pressure 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 deep 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 steam superheater burner;
a flame arrester is also arranged between the air suction fan and the steam superheater burner;
the first air suction chiller and the second air suction chiller are both cryocoolers taking a lithium bromide refrigerating unit as a cold source, and the lithium bromide refrigerating unit takes system waste heat as a heat source;
the plant air 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 first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank are both connected with a nitrogen supply device, and when the pressure in the first styrene normal-pressure storage tank and the pressure in the second styrene normal-pressure storage tank are lower than-0.2 KPa, the nitrogen supply device is started to supplement nitrogen;
the plant wind purging device is connected to the intersection of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline through a main pipeline respectively, a plant wind main valve, a plant wind rotor flow meter and a plant wind one-way valve are arranged on the main pipeline, a first air suction inlet purging valve is arranged between the main pipeline and the intersection of the first pipeline and the second pipeline, and a second air suction inlet purging valve is arranged between the main pipeline and the third pipeline and the fourth pipeline.
2. A safe recovery process of VOCs in a styrene storage tank is characterized by comprising the following steps: the safe recovery system of VOCs in a styrene storage tank of claim 1, 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 first styrene normal-pressure storage tank and a second styrene normal-pressure storage tank is also in a micro-negative pressure state;
b, along with the operation of the air suction fan, organic gases in the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank enter a first air suction chiller and a second air suction chiller through a first pipeline and a third pipeline respectively, the styrene gas volatilized by the first styrene normal-pressure storage tank and the second styrene normal-pressure storage tank, an air mixture entering a system and air entering the system through an air suction port are mixed together, part of mixed gas forms condensate under the action of the first air suction chiller and the second air suction chiller, and the condensate enters the underground sump oil tank through a second pipeline and a fourth pipeline respectively;
and c, feeding the mixed gas of the styrene and the air at the outlet of the air suction fan into a burner of the steam superheater for incineration.
3. The safe recovery process of VOCs in styrene storage tanks according to claim 2, characterized in that: and the flow direction of the condensate is observed through the first air suction cooling liquid window and the second air suction cooling liquid window.
4. The safe recovery process of VOCs in styrene storage tanks according to claim 2, 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.
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| CN201810582872.1A CN110564441B (en) | 2018-06-06 | 2018-06-06 | Safe recovery system and recovery process for VOCs in styrene storage tank |
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| CN202440010U (en) * | 2012-01-21 | 2012-09-19 | 浙江卫星石化股份有限公司 | Storage tank for volatile liquid materials |
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| CN206528878U (en) * | 2017-03-07 | 2017-09-29 | 河北峰煤焦化有限公司 | A kind of nitrogen seal device of harmful influence storage tank |
| CN107763639A (en) * | 2016-08-17 | 2018-03-06 | 中国石化工程建设有限公司 | A kind of method for handling volatile organic matter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2663357Y (en) * | 2003-11-28 | 2004-12-15 | 王勇 | Light oil recovery device of oil storage tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5100318B2 (en) * | 2007-11-12 | 2012-12-19 | 太平洋セメント株式会社 | Low flash point fuel storage system |
| CN202440010U (en) * | 2012-01-21 | 2012-09-19 | 浙江卫星石化股份有限公司 | Storage tank for volatile liquid materials |
| CN203558373U (en) * | 2013-10-29 | 2014-04-23 | 盖金祥 | Oil gas recovery device of oil product storage tanks |
| CN107763639A (en) * | 2016-08-17 | 2018-03-06 | 中国石化工程建设有限公司 | A kind of method for handling volatile organic matter |
| CN206528878U (en) * | 2017-03-07 | 2017-09-29 | 河北峰煤焦化有限公司 | A kind of nitrogen seal device of harmful influence storage tank |
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