CN109404718B - System and method for reducing VOCs emission and sealed nitrogen consumption of oil storage tank - Google Patents
System and method for reducing VOCs emission and sealed nitrogen consumption of oil storage tank Download PDFInfo
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- CN109404718B CN109404718B CN201811525598.0A CN201811525598A CN109404718B CN 109404718 B CN109404718 B CN 109404718B CN 201811525598 A CN201811525598 A CN 201811525598A CN 109404718 B CN109404718 B CN 109404718B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 21
- 230000001502 supplementing effect Effects 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 238000009833 condensation Methods 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005094 computer simulation Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 239000011261 inert gas Substances 0.000 abstract description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 21
- 239000000047 product Substances 0.000 description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012536 storage buffer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Treating Waste Gases (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a system for reducing the discharge amount of VOCs (volatile organic compounds) in an oil product storage tank and the consumption amount of sealed nitrogen, which comprises the oil product storage tank, a pressure calculator, a fan, a condenser, a separation tank and a high-low pressure selection controller, wherein the top of the oil product storage tank is provided with a nitrogen supplementing inlet, a recycling inlet and a gas outlet, the gas outlet is connected with the inlet of the fan through a pipeline, the outlet of the fan is connected with the inlet of the condenser through a pipeline, and the outlet of the condenser sends condensed gas into the separation tank through a pipeline; the bottom of the separation tank is provided with a heavy component discharge port, the top of the separation tank is provided with a light component escape port and an emergency port, and the light component escape port is connected with a recovery inlet arranged at the top of the oil product storage tank through a pipeline. The process equipment is simple, and the materials are easy to select. A fan and a separation tank are adopted, a reasonable pressure control system is provided, heavy components in VOCs can be recovered in a VOCs collecting and storing tank, and light components are used as inert gas to replace conventional nitrogen sealing gas.
Description
Technical Field
The invention relates to the fields of oil storage and transportation, environmental protection and chemical processes, in particular to a system and a method for reducing the VOCs emission of an oil storage tank and the consumption of sealing nitrogen.
Background
VOCs collection treatment is a process commonly existing in petrochemical products and raw material storage systems, and VOCs discharged in a feeding process are treated by processes such as low-temperature condensation recovery, activated carbon adsorption, heat storage combustion and the like at present; in order to prevent the pressure of the storage tank from being too low caused by the discharging process, a nitrogen regulating valve is usually arranged to supplement the pressure of the storage tank.
The main problems of the prior art for VOCs collection treatment are as follows: first, conventional condensation recovery processes require a low temperature medium; secondly, the consumption of nitrogen for sealing is high; thirdly, the problem of cold source of low-temperature condensation is easy to generate frosting in the process; fourth, the capital cost of post-treatment of VOCs is high.
Disclosure of Invention
The invention aims to provide a system and a method for reducing the VOCs emission and the sealing nitrogen consumption of an oil product storage tank, and aims to solve the technical problems of high VOCs post-treatment investment cost, complex treatment flow and high sealing nitrogen consumption in the processes of collecting and recycling the VOCs of the oil product storage tank and sealing the inert gas of the storage tank in the petrochemical industry (including coal chemical industry and coal coking industry).
In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a system for reducing the discharge amount of VOCs (volatile organic compounds) in an oil product storage tank and the consumption amount of sealed nitrogen, which comprises the oil product storage tank, a pressure calculator, a fan, a condenser, a separation tank (namely the VOCs pressure storage tank) and a high-low selective pressure controller, wherein the top of the oil product storage tank is provided with a nitrogen supplementing inlet, a recycling inlet and a gas outlet;
the bottom of the separation tank is provided with a heavy component discharge port, the top of the separation tank is provided with a light component escape port and an emergency port, and the light component escape port is connected with a recovery inlet arranged at the top of the oil product storage tank through a pipeline;
the externally added nitrogen is connected with the nitrogen supplementing inlet through a pipeline.
Further, a pressure control valve is arranged on the pipeline between the gas outlet and the fan inlet.
Further, the emergency standby port is connected with emergency treatment equipment through a pipeline; the emergency treatment device is a de-pressurizing gas or VOVs treatment device.
Further, a nitrogen supplementing valve is arranged on a pipeline between the externally added nitrogen and the nitrogen supplementing inlet; an isolation valve is arranged on a pipeline between the gas outlet and the fan inlet; an isolation valve is arranged on a pipeline between the light component escape port and the recovery inlet arranged at the top of the oil storage tank.
Further, pressure transmitters are arranged on the separating tank and the oil storage tank.
Further, the system also includes a heat exchanger; the outlet of the fan is communicated with the inlet of the heat exchanger through a pipeline, and the outlet of the heat exchanger sends cooled gas into the inlet of the condenser through a pipeline; a temperature detection device is arranged on a pipeline between the outlet of the heat exchanger and the inlet of the condenser.
Further, the fan is a high-voltage variable-frequency fan; the condenser is condensed by circulating water or air.
Further, there are at least three oil storage tanks; the oil storage tanks are connected in parallel.
Further, the heavy components in VOCs are recovered in the form of condensate.
In another aspect, the invention provides a process method of the system for reducing the emission of VOCs and the consumption of sealing nitrogen in an oil storage tank, comprising the following steps:
step one, laying out pipelines according to a design drawing; a pressure measuring point is arranged on the oil product storage tank, and a pressure control valve is arranged on a pipeline between the gas outlet and the inlet of the fan;
step two, according to the composition of the storage medium and the VOCs involved, performing simulation calculation, determining whether other gases need to be selected as gas mediums, determining the content of the gas mediums, calculating the amount of the high-temperature-condensation recovered VOCs according to the outlet pressure of the selectable high-pressure fan, and adjusting the type and the content of the medium gases if necessary;
step three, preliminarily determining the set values of a high-low selective pressure controller, a pressure reducing valve and a pressure control valve according to the design pressure of an oil product storage tank and the size of a system space (including a pipeline system);
and step four, verifying the reliability of the set value through dynamic simulation calculation.
The beneficial effects of the invention are as follows:
the system and the method for reducing the emission of the VOCs in the oil product storage tank and the consumption of the sealing nitrogen adopt a fan and a separation tank, are provided with a reasonable pressure control system, and the heavy components in the VOCs can be recovered in a VOCs collecting and storing tank, and the light components are used as inert gas to replace the conventional nitrogen sealing gas. The process equipment is simple, the materials are easy to select, and the method is a novel process for reducing the emission and consumption of VOCs.
2. According to the system and the method for reducing the VOCs emission and the sealed nitrogen consumption of the oil product storage tank, the high-pressure fan is adopted for pressurization, so that the problem that a low-temperature medium is needed in a conventional condensation recovery process is solved. The separation tank is arranged, so that the separation tank can be used for separating VOCs and also provides a storage buffer space for gas for sealing the oil product storage tank. The nitrogen consumption for sealing is reduced. The condensation process adopts circulating water or air cooling, so that the problem of low-temperature condensation cold source sources is avoided, and the problem of frosting in the process is avoided. The emission of VOCs in the process is reduced, light VOCs are used as sealing gas to be recycled to the storage system to be used as storage tank pressure supplementing gas, and the investment cost of VOCs after-treatment is reduced.
3. And the pressure control system and the parameter setting are carried out, and the mixing proportion of the VOCs gas and the nitrogen gas in the storage tank is verified by dynamic simulation calculation, so that the safe operation of the system under various working conditions is ensured. Along with the accumulation of light components in the VOCs in the process, part of the light components are condensed, so that the recovery rate of the VOCs is improved, the investment of a subsequent VOCs treatment system is reduced, a VOCs adsorption or incineration system can not be arranged under the condition of a low-pressure gas system, the investment, the material consumption and the energy consumption are saved, and the method has a certain significance and value for places with conditional utilization of the process.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The main objects and other advantages of the invention may be realized and attained by means of the instrumentalities and particularly pointed out in the specification and claims.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Reference numerals: 1-oil storage tank, 2-pressure control valve, 3-fan, 4-condenser, 5-knockout drum, 6-high-low selective pressure controller, 7-nitrogen supplementing inlet, 8-recycling inlet, 9-gas outlet, 10-heat exchanger, 11-light component escape outlet, 12-emergency standby port, 13-heavy component discharge port, 14-additional nitrogen, 15-nitrogen supplementing valve, 16-temperature detecting device and 17-pressure transmitter.
Detailed Description
The following examples are given by way of illustration only and are not to be construed as limiting the scope of the invention.
VOCs in petrochemical systems are mostly light components dissolved in oil products or raw material components volatilized when chemical raw materials change in temperature and pressure, are originally useful substances, but are discharged into the atmosphere to become waste gas. The compression of the VOCs can improve the condensation temperature on one hand, recover heavy components in the VOCs at normal temperature, improve the pressure of light components in the VOCs on the other hand, and can be used as storage tank pressure supplementing gas after decompression, so that the consumption of nitrogen is reduced.
The embodiment 1 of the invention provides a system for reducing the emission of VOCs (volatile organic compounds) in an oil product storage tank and the consumption of sealing nitrogen, which comprises the oil product storage tank 1, a pressure calculator, a fan 3, a condenser 4, a separation tank 5 and a high-low selective pressure controller 6, wherein the top of the oil product storage tank 1 is provided with a nitrogen supplementing inlet 7, a recycling inlet 8 and a gas outlet 9, the gas outlet 9 is connected with the inlet of the fan 3 through a pipeline, and a pressure control valve 2 is arranged on the pipeline between the gas outlet 9 and the inlet of the fan 3.
The outlet of the fan 3 is connected with the inlet of the condenser 4 through a pipeline, and the outlet of the condenser 4 sends the condensed gas into the separation tank 5 through a pipeline; the bottom of the separation tank 5 is provided with a heavy component discharge port 13, the top of the separation tank 5 is provided with a light component escape port 11 and an emergency standby port 12, and the emergency standby port 12 is connected with emergency treatment equipment through a pipeline; the emergency treatment device is a de-pressurizing gas or VOVs treatment device. The light component escape port 11 is connected with a recovery inlet 8 arranged at the top of the oil storage tank 1 through a pipeline; the additional nitrogen 14 is connected with the nitrogen supplementing inlet 7 through a pipeline.
A nitrogen supplementing valve 15 is arranged on a pipeline between the externally added nitrogen 14 and the nitrogen supplementing inlet 7; an isolation valve is arranged on a pipeline between the gas outlet 9 and the inlet of the fan 3; an isolation valve is arranged on a pipeline between the light component escape port 11 and the recovery inlet 8 arranged at the top of the oil storage tank 1. Pressure transmitters 17 are arranged on the separation tank 5 and the oil storage tank 1.
Wherein, the fan 3 is a high-voltage variable-frequency fan 3; the condenser 4 condenses with circulating water or air.
As shown in fig. 1, there are at least three oil storage tanks 1; the oil storage tanks 1 are connected in parallel. The number of the oil storage tanks 1 is set according to actual demands, and branch pipes and a main pipe are arranged during pipeline connection. The volatilized light component can be used as a pressurizing medium to circulate in the system to replace part of nitrogen.
The technological method of the system for reducing the discharge amount of VOCs in the oil storage tank and the consumption amount of sealing nitrogen comprises the following steps:
step one, laying out pipelines according to a design drawing; a pressure measuring point is arranged on the oil product storage tank 1, and a pressure control valve 2 is arranged on a pipeline between a gas outlet 9 and an inlet of the fan 3;
step two, according to the composition of the storage medium and the VOCs involved, performing simulation calculation, determining whether other gases need to be selected as the gas medium, determining the content of the gas medium, calculating the amount of the high-temperature-condensation recovered VOCs according to the outlet pressure of the optional high-pressure fan 3, and adjusting the type and the content of the medium gases if necessary.
Step three, preliminarily determining the set values of the high-low selective pressure controller 6, the pressure reducing valve and the pressure control valve according to the design pressure of the oil product storage tank 1 and the size of a system space (including a pipeline system);
and step four, verifying the reliability of the set value through dynamic simulation calculation.
Embodiment 2, a system and a method for reducing the emission of VOCs in an oil storage tank and the consumption of sealing nitrogen, which are similar to embodiment 1, are different in that they further include a heat exchanger 10; the outlet of the fan 3 is communicated with the inlet of the heat exchanger 10 through a pipeline, and the outlet of the heat exchanger 10 sends cooled gas into the inlet of the condenser 4 through a pipeline; a temperature detecting device 16 is arranged on a pipeline between the outlet of the heat exchanger 10 and the inlet of the condenser 4. See fig. 2.
Example 3 a chemical plant has three 3000 cubic meter methanol storage tanks (dome tanks, design pressure-500 Pa-2000 Pa) with exhausted VOCs components of methanol vapor and nitrogen seal nitrogen, a breathing valve exhalation pressure of 655Pa and a breathing valve inhalation pressure of 100Pa.
The maximum discharge of large breath during simultaneous feeding is 240m 3 The small breath considers 10-degree temperature difference, the discharge amount is 280 m3/h, and the total is 520m3/h; at the same time, the maximum suction amount of the discharged material is 2070m 3 /h。
If an internal floating roof tank is not used, the nitrogen consumption is 2072Nm 3 /h。
The invention provides a system and a method for reducing the discharge amount of VOCs in an oil product storage tank and the consumption amount of sealing nitrogen, wherein the consumption amount of nitrogen is 24Nm 3 /h (this nitrogen is the amount of nitrogen dissolved in methanol and carried away). The flow rate of the circulating gas is 2500m 3 And/h, the outlet pressure of the fan 3 is 200kPa, the power of the fan 3 is 80kW, and the consumption of circulating water is 25m 3 And/h, the liquid-phase methanol in the separation tank 5 after condensation is 580kg/h.
The methanol volatilized in the process circulates in the closed system, so that the material loss caused by VOCs emission is avoided, VOCs post-treatment facilities are not required to be arranged, an inner floating roof tank is not required to be arranged, and the cost can be effectively reduced.
In summary, the invention provides a system and a method for reducing the emission of VOCs in an oil storage tank and the consumption of sealing nitrogen, and the VOCs volatilized in the oil storage tank 1 are recovered after being properly pressurized and condensed, and the unretracted gas is recycled to the oil storage tank 1 and used as the pressure-supplementing sealing gas.
By adopting the fan 3 and the separating tank and being provided with a reasonable pressure control system, heavy components in the VOCs can be recovered at a heavy component discharge outlet 13 arranged at the bottom of the separating tank 5. The light component is used as inert gas to replace the conventional nitrogen sealing gas. The problem that low-temperature medium is needed in the conventional condensation recovery process is avoided, the problem of nitrogen consumption in conventional nitrogen sealing is reduced (or cancelled), and the load of the subsequent VOCs treatment process (activated carbon adsorption or incineration process) is reduced. And under the condition of good conditions, the subsequent VOCs treatment process can be canceled.
It should be noted that: the heavy components will vary depending on the materials stored in the tank, which is relatively speaking. In the case of a methanol tank, nitrogen is used as a protection, and methanol is a heavy component. Because of the different pressure in the separator tank, the condensed components will also be different.
The foregoing is merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions that would occur to those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A process method for utilizing a system for reducing the discharge amount of VOCs in an oil product storage tank and the consumption amount of sealing nitrogen is characterized in that,
the system comprises an oil product storage tank (1), a fan (3), a condenser (4), a separation tank (5) and a high-low pressure selection controller (6), wherein a nitrogen supplementing inlet (7), a recycling inlet (8) and a gas outlet (9) are formed in the top of the oil product storage tank (1), the gas outlet (9) is connected with the inlet of the fan (3) through a pipeline, the outlet of the fan (3) is connected with the inlet of the condenser (4) through a pipeline, and the outlet of the condenser (4) sends condensed gas into the separation tank (5) through a pipeline;
the bottom of the separation tank (5) is provided with a heavy component discharge outlet (13), the top of the separation tank (5) is provided with a light component escape outlet (11) and an emergency standby outlet (12), and the light component escape outlet (11) is connected with a recovery inlet (8) arranged at the top of the oil product storage tank (1) through a pipeline;
the externally added nitrogen (14) is connected with the nitrogen supplementing inlet (7) through a pipeline; a pressure control valve (2) is arranged on a pipeline between the gas outlet (9) and the inlet of the fan (3); the emergency standby port (12) is connected with emergency treatment equipment through a pipeline; the emergency treatment equipment is low-pressure gas;
the method comprises the following steps:
step one, laying out pipelines according to a design drawing; a pressure measuring point is arranged on the oil product storage tank (1), and a pressure control valve (2) is arranged on a pipeline between the gas outlet (9) and the inlet of the fan (3);
step two, according to the composition of the storage medium and the VOCs involved, performing simulation calculation, determining whether other gases need to be selected as the gas medium, determining the content of the gas medium, calculating the maximum amount of the VOCs recovered by normal temperature condensation according to the outlet pressure of the optional high-pressure fan (3), and adjusting the type and the content of the gas medium;
step three, preliminarily determining set values of a high-low selective pressure controller (6), a pressure reducing valve and a pressure control valve (2) according to the design pressure of the oil product storage tank (1) and the size of a system space;
and step four, verifying the reliability of the set value through dynamic simulation calculation.
2. Process according to claim 1, characterized in that a nitrogen supplementing valve (15) is arranged on the line between the additional nitrogen (14) and the nitrogen supplementing inlet (7); an isolation valve is arranged on a pipeline between the gas outlet (9) and the inlet of the fan (3); an isolation valve is arranged on a pipeline between the light component escape port (11) and the recovery inlet (8) arranged at the top of the oil storage tank (1).
3. A process according to claim 1, characterized in that the separator tank (5) and the oil storage tank (1) are provided with pressure transmitters (17).
4. The process according to claim 1, wherein the system further comprises a heat exchanger (10); the outlet of the fan (3) is communicated with the inlet of the heat exchanger (10) through a pipeline, and the outlet of the heat exchanger (10) sends cooled gas into the inlet of the condenser (4) through a pipeline; a temperature detection device (16) is arranged on a pipeline between the outlet of the heat exchanger (10) and the inlet of the condenser (4).
5. The process according to claim 1, characterized in that the fan (3) is a high-voltage variable-frequency fan (3); the condenser (4) uses circulating water or air for condensation.
6. The process according to claim 1, characterized in that there are at least three oil storage tanks (1); the oil product storage tanks (1) are connected in parallel.
7. The process of claim 1 wherein the heavy components of the VOCs are recovered as a condensate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811525598.0A CN109404718B (en) | 2018-12-13 | 2018-12-13 | System and method for reducing VOCs emission and sealed nitrogen consumption of oil storage tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811525598.0A CN109404718B (en) | 2018-12-13 | 2018-12-13 | System and method for reducing VOCs emission and sealed nitrogen consumption of oil storage tank |
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| CN109404718B true CN109404718B (en) | 2023-12-19 |
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