CN216612513U - Oil storage tank top gas and wharf oil gas recovery system of combined station - Google Patents
Oil storage tank top gas and wharf oil gas recovery system of combined station Download PDFInfo
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- CN216612513U CN216612513U CN202122376322.4U CN202122376322U CN216612513U CN 216612513 U CN216612513 U CN 216612513U CN 202122376322 U CN202122376322 U CN 202122376322U CN 216612513 U CN216612513 U CN 216612513U
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Abstract
The utility model discloses a tank top gas and wharf oil gas recovery system of an oil storage tank of a combined station, which comprises a nitrogen making unit, wherein a first pipeline and a second pipeline are arranged at the downstream of the nitrogen making unit, an adsorption type oil gas recovery device, a separator, a Roots blower, a dryer, an oil remover and a heating furnace are sequentially arranged at the downstream of the first pipeline, a storage tank area and a safe pressure relief water seal device are arranged at the downstream of the second pipeline in parallel, the outlet of the oil remover is connected with a self-operated regulating valve through a third pipeline, and the outlet of the self-operated regulating valve is connected with the inlet of the safe pressure relief water seal device. The nitrogen making machine set is arranged at the wharf, the oil tank of the oil tanker is inerted, the pressure balance of the system is realized, the purposes of saving energy, reducing emission and reducing environmental pollution can be realized, and the self-use fuel required by heat supply equipment is effectively saved.
Description
Technical Field
The utility model relates to oil and gas field ground engineering, in particular to a system for recovering tank top gas of an oil storage tank of a combined station and oil and gas at a wharf.
Background
In some oil and gas field ground projects, because the oil amount processed by entering a station is more, and the oil is a closed flow with pressure, a certain amount of dissolved gas exists in oil, and gas-containing crude oil is stored in a closed oil storage tank, after the operations of heating, continuous oil inlet and the like, more tank top gas is volatilized from the top of the oil tank, so that the emission can not meet the environmental protection standard requirement, the emission seriously exceeds the standard, the phenomenon of seriously polluting the atmospheric environment exists, and resources are wasted.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problems in the prior art, and provides a system for recovering tank top gas of an oil storage tank of a combined station and oil gas at a wharf.
The technical problem of the utility model is mainly solved by the following technical scheme:
a system for recovering tank top gas and wharf oil gas of an oil storage tank of a combination station is characterized by comprising a nitrogen making unit, wherein a first pipeline and a second pipeline are arranged at the downstream of the nitrogen making unit,
the downstream of the first pipeline is provided with an adsorption type oil gas recovery device, a separator, a Roots blower, a dryer, an oil remover and a heating furnace in sequence,
a storage tank area and a safe pressure relief water seal device are arranged in parallel at the downstream of the second pipeline,
the outlet of the oil remover is connected with a self-operated regulating valve through a third pipeline, and the outlet of the self-operated regulating valve is connected with the inlet of the safe pressure relief water seal device.
In a preferred embodiment of the present invention, the adsorption type oil and gas recovery apparatus comprises a pair of first adsorption tanks and a second adsorption tank arranged in parallel, the first adsorption tank and the second adsorption tank being filled with an adsorbent,
the first pipeline is connected with the bottom of the first adsorption tank through a first electromagnetic valve, the top of the first adsorption tank is connected with a vent through a second electromagnetic valve, the bottom of the first adsorption tank is connected with a vacuum pump through a third electromagnetic valve,
the first pipeline is connected with the bottom of the second adsorption tank through a fourth electromagnetic valve, the top of the second adsorption tank is connected with the evacuation port through a fifth electromagnetic valve, the bottom of the second adsorption tank is connected with the vacuum pump through a sixth electromagnetic valve,
a nitrogen supplementing port is arranged between the top of the first adsorption tank and the top of the second adsorption tank,
the low reaches of vacuum pump be equipped with a buffer tank, the first export of buffer tank arrange the gas that does not reach standard to the day lamp, the second export of buffer tank send the gas that reaches standard to low reaches.
In a preferred embodiment of the present invention, the first adsorption tank and the second adsorption tank are provided with temperature sensors inside.
In a preferred embodiment of the present invention, the adsorption type oil and gas recovery device is of a skid-mounted type.
The oil storage tank top gas and wharf oil gas recovery system of the combination station has the following advantages:
1. the tank top gas and wharf oil gas are recycled and enter the adsorption type oil gas recycling device, air and inert gas are separated, and the separated air and inert gas enter the heating furnace after entering the Roots blower for pressurization and then are combusted. The problem of the recovery of oil tanker gas during oil loading is solved, the surrounding environment is effectively protected, the safety production is met, the harmonious industry and agriculture relation is established, and the aims of energy conservation, emission reduction and green low-carbon development and production are fulfilled.
2. The recovery system adopts technologies of 'utilizing wharf oil ship gas as make-up gas for loading oil tank' and setting 'adsorption type oil gas recovery device' to separate air and inert gas, wherein the adsorption type oil gas recovery device is integrally in a skid-mounted structure, all systems are completely integrated in a skid block, and a gas collection main pipe is only butted with a unit on site to distribute power for equipment. The skid block is designed according to a stainless steel shell, so that the skid block is anticorrosive and attractive. The process is advanced, the operation is safe and reliable, all equipment in the recovery system operates in a closed cycle mode, and the energy conservation is high; the automation degree of the process equipment control is high. And the DCS distributed control system is adopted to comprehensively monitor the running parameter state of the system, and the functions of dynamic display of a flow chart, fault alarm, trend record display and the like are adopted to effectively guarantee the production process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the connection structure of the combined station oil storage tank top gas and terminal oil gas recovery system of the present invention;
fig. 2 is a schematic diagram of a connection structure of the adsorption type oil gas recovery apparatus in fig. 1.
Detailed Description
As shown in figure 1, the system for recovering the tank top gas and the oil gas at the wharf of the oil storage tank of the combined station comprises a nitrogen generating unit 1, a first pipeline L1 and a second pipeline L2 are arranged at the downstream of the nitrogen generating unit 1,
an adsorption type oil gas recovery device 2, a separator 3, a roots blower 4, a dryer 5, an oil remover 6 and a heating furnace 9 are arranged at the downstream of the first pipeline L1 in sequence.
A storage tank area 7 and a safety pressure relief water seal device 8 are arranged in parallel at the downstream of the second pipeline L2,
the outlet of the degreaser 6 is connected to a self-operated regulating valve 10 through a third pipeline L3, and the outlet of the self-operated regulating valve 10 is connected to the inlet of the safety relief water seal device 8.
The pressure after the self-operated regulating valve 10 was set to 100 Pa. The set pressure relief pressure of the safe pressure relief water seal device 8 is 1200-1400 Pa, and the nominal volume flow of the Roots blower is 2Nm3Min, suction pressure of 0.2-0.5 KPa, exhaust pressure of 15-30KPa and gas outlet temperature of 100 ℃.
As shown in fig. 2, the adsorption type oil gas recovery apparatus 2 includes a pair of first adsorption tanks 11 and a second adsorption tank 12 arranged in parallel.
The first line L1 is connected to the bottom of the first canister 11 via a first solenoid valve S1, the top of the first canister 11 is connected to a drain K via a second solenoid valve S2, and the bottom of the first canister 11 is connected to a vacuum pump 13 via a third solenoid valve S3.
The first line L1 is connected to the bottom of the second adsorption tank 12 through a fourth solenoid valve S4, the top of the second adsorption tank 12 is connected to the drain K through a fifth solenoid valve S5, and the bottom of the second adsorption tank 12 is connected to the vacuum pump 13 through a sixth solenoid valve S6.
A nitrogen supplementing opening S7 is arranged between the top of the first adsorption tank 11 and the top of the second adsorption tank 12.
The downstream of the vacuum pump 13 is provided with a buffer tank 14, a first outlet 141 of the buffer tank 14 discharges unqualified gas to a ceiling lamp, a second outlet 142 of the buffer tank 14 sends qualified gas to the downstream, and the oxygen content is less than or equal to 1.8 percent.
It is noted that the nitrogen yield of the nitrogen generating unit 1 is more than or equal to 280Nm3And h, the nitrogen production purity is more than or equal to 99 percent. The treatment gas amount of the adsorption type oil gas recovery device 2 is more than or equal to 355Nm3The removal efficiency of the non-methane total hydrocarbon is more than or equal to 95 percent.
The operation of the adsorption type oil gas recovery apparatus 2 will be described.
The adsorption type oil gas recovery device 2 adopts a structure consisting of two adsorption tanks, and alternately performs adsorption, desorption and cleaning processes. The first adsorption tank 11 and the second adsorption tank 12 are each filled with an adsorbent.
The first adsorption tank 11 adsorbs the oil gas component in the mixed gas at normal pressure. After the adsorption is saturated, the system automatically switches into the second adsorption tank 12 for adsorption treatment, and simultaneously, the vacuum pump 13 is used for carrying out vacuum analysis on the first adsorption tank 11, so that the adsorbent is regenerated.
In the initial stage of the desorption, the lower part of the adsorbent in the first adsorption tank 11 is the original gas (containing a large amount of oxygen), and the gas first enters the buffer tank 14, and then the adsorbed gas is recovered by vacuum desorption. Since nitrogen is supplemented to the upper part of the adsorbent in the first adsorption tank 11, the oxygen content of the adsorption gas is low, and the oxygen concentration is reduced after nitrogen supplementation. An oxygen detector is arranged in the buffer tank for continuous detection, when the oxygen concentration in the gas in the buffer tank 14 is below 1.8%, the buffer tank is automatically opened to exhaust the gas, and the gas enters a large tank air extractor system to recover the volatile gas. Thus, the collection of the boil-off gas is discontinuous and the gap time is short.
Because the adsorbent can release heat at the in-process of adsorbing the oil gas, all be equipped with temperature sensor on first adsorption tank 11 and second adsorption tank 12 for monitor active carbon adsorption tank temperature. If the temperature is too high, the system is switched to another tank, and nitrogen is introduced to reduce the temperature. If necessary, the shutdown program is automatically started and an alarm is given.
The adsorbent needs to be an imported special brand adsorbent to ensure the adsorption performance, and needs to be capable of recovering part of methane gas and discharging part of carbon dioxide gas.
The adsorption type oil gas recovery device adopts a skid-mounted structure, all systems are integrated in a skid block, and a gas collection main pipe is only butted with a unit on site to distribute power for equipment. Gas treatment amount of adsorption type oil gas recovery device
≥355Nm3And h, the removal efficiency of the non-methane total hydrocarbons reaches more than 95 percent.
Volatile gas of the oil storage tank top and the wharf oil tanker is recovered and then passes through an adsorption type oil gas recovery device to filter air and inert gas, the volatile gas is separated out from the pipe through a separator and enters a Roots blower to be pressurized to 15-30kpa, and then is cooled to 10-40 ℃ through a natural gas drier and finally supplied to a heating furnace for combustion after passing through an oil remover.
Taking the project implementation of the city continental united station as an example, the city continental united station is reduced by about 39.8-64 multiplied by 104Nm each year3The emission of large-tank volatile gas is reduced by about 28.6-38.2 multiplied by 104Nm each year at an oil loading dock3Discharging the oil tanker volatile gas; the total non-methane hydrocarbon emission of the adsorption device of the Zhongcheng united station is about 8-20 g/m3And meets the regulation of the atmospheric pollutant emission standard of oil storage (GB 20950-2007): the mass concentration of oil gas emission is less than or equal to 25g/m3The actual total oil gas emission is very little, about 2.2-5.5 multiplied by 104Nm3And a, an adsorption type oil gas recovery device is arranged for constructing 3.2 to 5.4 percent of the front of a large tank air extraction device, so that the concentration of oxygen in natural gas can be reduced, and the operation is safe and reliable. Reducing the supplementary nitrogen gas entering the air extractor system when the big tank is supplemented with airThe nitrogen flow rate was 260Nm3The duration is about 8h, and the nitrogen flow is 40Nm after the gas is supplemented3The two parts enter a boiler combustion system, and about 6-10 Nm is reduced3The carbon dioxide gas enters a boiler combustion system, the loss of combustion heat is reduced by about 1.2 ten thousand yuan/year, the boiler is convenient to burn, the amount of gas entering the Roots blower is reduced (nitrogen and the carbon dioxide gas are useless parts), the power consumption of a motor of the Roots blower is reduced by about 4.7 ten thousand yuan/year, and the total operation cost is reduced by about 5.9 ten thousand yuan/year.
The nitrogen making machine set is arranged at the wharf, the oil tank of the oil tanker is inerted, the pressure balance of the system is realized, the purposes of saving energy, reducing emission and reducing environmental pollution can be realized, and the self-use fuel required by heat supply equipment is effectively saved.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (4)
1. A system for recovering oil storage tank top gas and wharf oil gas of a combined station is characterized by comprising a nitrogen making unit (1), wherein a first pipeline (L1) and a second pipeline (L2) are arranged at the downstream of the nitrogen making unit (1),
an adsorption type oil gas recovery device (2), a separator (3), a Roots blower (4), a dryer (5), an oil remover (6) and a heating furnace (9) are sequentially arranged at the downstream of the first pipeline (L1),
a storage tank area (7) and a safe pressure relief water seal device (8) are arranged in parallel at the downstream of the second pipeline (L2),
the outlet of the oil remover (6) is connected with a self-operated regulating valve (10) through a third pipeline (L3), and the outlet of the self-operated regulating valve (10) is connected with the inlet of the safe pressure relief water seal device (8).
2. The terminal storage tank head gas and terminal oil and gas recovery system according to claim 1, wherein the adsorption type oil and gas recovery device (2) comprises a pair of first adsorption tank (11) and a second adsorption tank (12) which are arranged in parallel, the first adsorption tank (11) and the second adsorption tank (12) are filled with an adsorbent,
the first pipeline (L1) is connected with the bottom of the first adsorption tank (11) through a first electromagnetic valve (S1), the top of the first adsorption tank (11) is connected with an exhaust port (K) through a second electromagnetic valve (S2), the bottom of the first adsorption tank (11) is connected with a vacuum pump (13) through a third electromagnetic valve (S3),
the first pipeline (L1) is connected with the bottom of the second adsorption tank (12) through a fourth electromagnetic valve (S4), the top of the second adsorption tank (12) is connected with the evacuation port (K) through a fifth electromagnetic valve (S5), the bottom of the second adsorption tank (12) is connected with the vacuum pump (13) through a sixth electromagnetic valve (S6),
a nitrogen supplementing opening (S7) is arranged between the top of the first adsorption tank (11) and the top of the second adsorption tank (12),
a buffer tank (14) is arranged at the downstream of the vacuum pump (13), a first outlet (141) of the buffer tank (14) discharges unqualified gas to the skylight, and a second outlet (142) of the buffer tank (14) sends the qualified gas to the downstream.
3. The terminal storage tank cap gas and terminal oil and gas recovery system according to claim 1, wherein the first adsorption tank (11) and the second adsorption tank (12) are internally provided with temperature sensors.
4. The terminal storage tank topping and terminal oil and gas recovery system of claim 1 wherein the adsorption oil and gas recovery unit (2) is skid mounted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122376322.4U CN216612513U (en) | 2021-09-29 | 2021-09-29 | Oil storage tank top gas and wharf oil gas recovery system of combined station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122376322.4U CN216612513U (en) | 2021-09-29 | 2021-09-29 | Oil storage tank top gas and wharf oil gas recovery system of combined station |
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