CN113088322A - Offshore oilfield crude oil and associated gas combined desulfurization treatment device and method - Google Patents
Offshore oilfield crude oil and associated gas combined desulfurization treatment device and method Download PDFInfo
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- CN113088322A CN113088322A CN202110423420.0A CN202110423420A CN113088322A CN 113088322 A CN113088322 A CN 113088322A CN 202110423420 A CN202110423420 A CN 202110423420A CN 113088322 A CN113088322 A CN 113088322A
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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
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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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
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/201—Impurities
- C10G2300/202—Heteroatoms content, i.e. S, N, O, P
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- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to a device and a method for combined desulfurization treatment of crude oil and associated gas in an offshore oil field, wherein the device comprises the following steps: the inlet of the heater is connected with the outlet of the dehydrated crude oil conveying pipe; the first inlet of the gas stripping desulfurization tower is connected with the outlet of the heater, and the first outlet of the gas stripping desulfurization tower is connected with the input end of the compressor; the inlet of the first cooler is connected with the output end of the compressor and the outlet of the oilfield associated gas conveying pipe; the inlet of the coalescence separator is connected with the outlet of the first cooler; the desulfurizing tower, the exit linkage of the first entry and the coalescence-separation ware of desulfurizing tower, the first export of desulfurizing tower and the entry linkage of complex ferrous redox ware, the export of complex ferrous redox ware and the second entry linkage of desulfurizing tower, the second export of desulfurizing tower is used for exporting the desulfurization natural gas. The device can realize the combined treatment of crude oil and associated gas, and the sulfur content of the crude oil and the associated gas reaches the standard.
Description
Technical Field
The invention relates to a device and a method for combined desulfurization treatment of crude oil and associated gas in an offshore oil field, and belongs to the technical field of offshore oil field equipment.
Background
The problem of associated hydrogen sulfide exists in the development of offshore oil fields in part of China, and great challenges are brought to the treatment of crude oil and natural gas, the utilization of fuel oil and fuel gas, the corrosion prevention of equipment and pipelines, the safety of personnel and the like. In the traditional non-desulfurization production flow, crude oil and natural gas which are not desulfurized enter a downstream flow, so that the grade of anticorrosive material selection of equipment and pipelines is increased, fuel oil and fuel gas can not meet the gas requirement of a generator or a boiler user, and the corrosion leakage risk is greatly increased. Once corrosion perforation occurs, the safety of offshore platform operators is also compromised.
Disclosure of Invention
Aiming at the outstanding problems, the invention provides a device and a method for combined desulfurization treatment of crude oil and associated gas of an offshore oil field.
In order to achieve the purpose, the invention adopts the following technical scheme:
a desulfurization treatment device is united to offshore oil field crude oil and associated gas, includes following part:
the inlet of the heater is connected with the outlet of the dehydrated crude oil conveying pipe;
the first inlet of the gas stripping desulfurization tower is connected with the outlet of the heater, the first outlet of the gas stripping desulfurization tower is connected with the input end of the compressor, and the second outlet of the gas stripping desulfurization tower is a desulfurized crude oil output port;
the inlet of the first cooler is connected with the output end of the compressor and the outlet of the oilfield associated gas conveying pipe;
a coalescer having an inlet connected to the outlet of the first cooler;
the first inlet of the desulfurizing tower is connected with the outlet of the coalescence separator, the first outlet of the desulfurizing tower is connected with the inlet of the complexing ferrous iron redox device, the outlet of the complexing ferrous iron redox device is connected with the second inlet of the desulfurizing tower, the second outlet of the desulfurizing tower is used for outputting desulfurized natural gas, and a branch outlet is further arranged at the second outlet of the desulfurizing tower and is used for being connected with the second inlet of the gas stripping desulfurizing tower.
Offshore oil field crude oil and associated gas unite desulfurization processing apparatus, preferably, the desulfurizing tower includes a jar body, the upper portion of jar body is provided with filters the silk screen, the middle part of jar body is provided with a plurality of grid boards, the lower part of jar body is provided with the distribution pipe, filter the silk screen and be configured to filter liquid and sulphur granule in the natural gas after the desulfurization, the grid board is configured to increase the area of contact and the contact time of natural gas and complex iron solution, the distribution pipe is configured to contain sulphur natural gas evenly distributed to the bottom of jar body.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device is characterized in that preferably, the plurality of grid plates comprise a plurality of layers of second grid plates which are vertically arranged, grid holes are formed in the second grid plates, and the second grid plates are configured to accelerate the flow distribution of the complex iron solution among the plurality of grid plates.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device preferably comprises a plurality of grid plates, wherein the grid plates further comprise first grid plates arranged above the second grid plates, the first grid plates are also provided with grid holes and are horizontal grid plates, and the first grid plates are configured to accelerate the flowing of a complex iron solution and the escape of desulfurized natural gas.
Offshore oil field crude oil and associated gas unite desulfurization processing apparatus, preferably, still include booster pump filter, booster pump and second cooler, the entry of booster pump filter with the second exit linkage of gas stripping desulfurizing tower, the export of booster pump filter with the input of booster pump is connected, the output of booster pump with the entry linkage of second cooler, the export of second cooler and the entry linkage of desulfurization crude oil storage tank.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device preferably further comprises a nitrogen storage tank, an outlet of the nitrogen storage tank is connected with a second inlet of the gas stripping desulfurization tower, and a gas stripping gas flow regulating valve and a standby nitrogen switching valve are arranged on a pipeline connected with the nitrogen storage tank and the second inlet of the gas stripping desulfurization tower.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device preferably further comprises a complexing ferrous iron redox sprayer which is arranged in the desulfurization tower and is positioned above the first grid plate.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device is characterized in that preferably, the diameter of the grid hole is 3-5 cm.
The offshore oilfield crude oil and associated gas combined desulfurization treatment device is preferably characterized in that the distance between every two adjacent second grating plates is 12-15 cm.
Based on the offshore oil field crude oil and associated gas combined desulfurization treatment device, the invention also provides a treatment method of the device, which comprises the following steps:
after the temperature of the dehydrated crude oil is raised by the heater, the dehydrated crude oil enters the gas stripping desulfurization tower, hydrogen sulfide dissolved in the crude oil is flashed out by the gas stripping desulfurization tower to obtain desulfurized crude oil, the desulfurized crude oil is discharged from a second outlet of the gas stripping desulfurization tower, impurities are filtered by a booster pump filter, the pressure of the desulfurized crude oil is raised by the booster pump, and the desulfurized crude oil is conveyed to a downstream qualified crude oil conveying flow after the temperature is controlled by the second cooler; the stripping desulfurization tower discharges gas containing hydrogen sulfide flashed from crude oil from a first outlet of the stripping desulfurization tower, the gas is pressurized by the compressor, is converged with sulfur-containing associated gas conveyed by the oilfield associated gas conveying pipe, is subjected to temperature control by the first cooler and then enters the coalescence separator to remove liquid drops in natural gas, the sulfur-containing natural gas enters the desulfurization tower to be contacted with a complex iron solution, most of the desulfurized natural gas is discharged to a downstream qualified gas conveying process through a second outlet of the desulfurization tower, and a small part of the natural gas without sulfur is used as a gas stripping gas to circulate and then enters the stripping desulfurization tower.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the device can realize the combined treatment of the crude oil and the associated gas and realize the standard of sulfur content of the crude oil and the associated gas.
2. The device is a totally-enclosed flow, high-concentration hydrogen sulfide removed from crude oil enters natural gas desulfurization treatment, and hydrogen sulfide gas-free torch is discharged.
3. The gas stripping gas is recycled, and the qualified natural gas after desulfurization treatment is used as the gas of the crude oil gas desulfurization tower and can be recycled after hydrogen sulfide is removed through recycling.
4. The invention utilizes nitrogen to carry out gas source standby, and can utilize nitrogen to supplement gas flow when the device is started or the desulfurization associated gas is insufficient.
5. The natural gas desulfurization tower utilizes the redox characteristic of the complex iron solution, hydrogen sulfide is oxidized to generate elemental sulfur and then is removed for outward transportation, and the toxicity and corrosivity of the hydrogen sulfide are completely eliminated. Therefore, the method can be widely applied to the technical field of desulfurization treatment of crude oil and associated gas in offshore oil fields.
6. According to the invention, the grid plate is arranged in the desulfurization tower, so that natural gas bubbles and the grid plate can collide and be crushed, and the contact area and the contact time of the natural gas and the complexing iron solution are further increased; in addition, the large inclination and fluctuation of the liquid level in the desulfurization tower are effectively inhibited through the cooperation between the multi-layer vertically arranged grid plates and the horizontal grid plates; by arranging the filtering wire mesh in the desulfurizing tower, liquid and sulfur particles in desulfurized natural gas can be filtered out, so that the blockage of a desulfurized natural gas conveying pipeline is avoided; through set up the natural gas distribution pipe in the bottom of desulfurizing tower, make the natural gas bubble evenly distributed in jar body bottom, increased with the area of contact of solution.
Drawings
FIG. 1 is a schematic structural diagram of an offshore oilfield crude oil and associated gas combined desulfurization treatment device provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a natural gas desulfurization tower provided by the embodiment of the invention;
fig. 3 is a top view of a horizontal grid plate in the natural gas desulfurization tower according to the embodiment of the present invention;
FIG. 4 is a top view of a vertical grid plate in a natural gas desulfurization tower according to this embodiment of the present invention;
the respective symbols in the figure are as follows:
1-a heater; 2-a gas stripping desulfurization tower; 3-a compressor; 4-a first cooler; 5-a coalescing separator; 6-a desulfurizing tower, 601-a tank body, 602-a filtering screen, 603-a first washing nozzle, 604-a second washing nozzle, 605-a first grating plate, 606-a second grating plate and 607-a distribution pipe; 7-booster pump filter; 8-a booster pump; 9-a second cooler; 10-liquid level regulating valve; 11-gas stripping gas flow regulating valve; 12-spare nitrogen switching valve; 13-dehydrated crude oil delivery pipe; 14-oil field associated gas conveying pipe; 15-nitrogen storage tank; 16-complex ferrous iron redox device, 1601-complex iron solution nozzle; 17-a desulfurized natural gas storage tank; 18-desulfurized crude oil storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As shown in fig. 1, the invention provides a combined desulfurization treatment device for crude oil and associated gas in an offshore oil field, which comprises the following components:
the inlet of the heater 1 is connected with the outlet of the dehydrated crude oil conveying pipe 13; a first inlet of the gas stripping desulfurization tower 2 is connected with an outlet of the heater 1, a first outlet of the gas stripping desulfurization tower 2 is connected with an input end of the compressor 3, and a second outlet of the gas stripping desulfurization tower 2 is a desulfurized crude oil output port; a first cooler 4, wherein the inlet of the first cooler 4 is connected with the output end of the compressor 3 and the outlet of the oilfield associated gas conveying pipe 14; a coalescer 5, the inlet of the coalescer 5 being connected to the outlet of the first cooler 4; desulfurizing tower 6, the exit linkage of the first entry and coalescence separator 5 of desulfurizing tower 6, the entry linkage of the first export and the complexing ferrous redox ware 16 of desulfurizing tower 6, the export of complexing ferrous redox ware 16 and the second entry linkage of desulfurizing tower 6, the second export of desulfurizing tower 6 is used for exporting the desulfurization natural gas, the second exit of desulfurizing tower 6 still is provided with the branch export and is used for the second entry linkage with gas stripping desulfurizing tower 2. The device can realize the combined treatment of the crude oil and the associated gas and realize the standard of sulfur content of the crude oil and the associated gas.
In the embodiment, the operation pressure of the stripping desulfurization tower 2 is 30kPaG, the operation temperature is 120-150 ℃, and the content of hydrogen sulfide in the desulfurized crude oil is less than or equal to 2 ppm.
In the embodiment, the operation pressure of the desulfurizing tower 6 is 400-600 kPaG, the operation temperature is 40-50 ℃, and the content of hydrogen sulfide in the desulfurized natural gas is less than or equal to 20 ppm.
In a preferred embodiment of the present invention, the desulfurization tower 6 comprises a tank 601, a filtering screen 602 is disposed at the upper part of the tank 601, a plurality of grating plates are disposed at the middle part of the tank 601, a distribution pipe 607 is disposed at the lower part of the tank 601, the filtering screen 602 is configured to filter out liquid and sulfur particles in the desulfurized natural gas, the grating plates are configured to increase the contact area and contact time of the natural gas and the complexing iron solution, and the distribution pipe 607 is configured to uniformly distribute the sulfur-containing natural gas to the bottom of the tank 601.
In a preferred embodiment of the present invention, the plurality of grid plates includes a plurality of layers of vertically arranged second grid plates 606, the second grid plates 606 are provided with grid holes, and the second grid plates 606 are configured to accelerate the flow distribution of the complexed iron solution between the plurality of grid plates.
In a preferred embodiment of the present invention, the plurality of grid plates further comprises a first grid plate 605 disposed above the second grid plate 606, the first grid plate 605 is also provided with grid holes and is a horizontal grid plate, and the first grid plate 605 is configured to accelerate the flow of the complex iron solution and the escape of the natural gas after desulfurization.
In a preferred embodiment of the invention, the system further comprises a booster pump filter 7, a booster pump 8 and a second cooler 9, wherein an inlet of the booster pump filter 7 is connected with a second outlet of the gas stripping desulfurization tower 2, an outlet of the booster pump filter 7 is connected with an input end of the booster pump 8, an output end of the booster pump 8 is connected with an inlet of the second cooler 9, and an outlet of the second cooler 9 is connected with an inlet of the desulfurized crude oil storage tank 18.
In a preferred embodiment of the invention, the device further comprises a nitrogen storage tank 15, wherein an outlet of the nitrogen storage tank 15 is connected with a second inlet of the stripping desulfurization tower 2, and a stripping gas flow regulating valve 11 and a standby nitrogen switching valve 12 are arranged on a pipeline connected with the nitrogen storage tank 15.
In a preferred embodiment of the present invention, the complexed ferrous redox reactor 16 further comprises a complexed ferric solution spray 1601 disposed within the desulfurization tower 6 above the first grid plate 605.
In a preferred embodiment of the present invention, the diameter of the grid holes is 3 to 5 cm.
In a preferred embodiment of the present invention, the distance between the adjacent second grid plates 606 is 12 to 15 cm.
Based on the offshore oil field crude oil and associated gas combined desulfurization treatment device, the invention also provides a treatment method of the device, which comprises the following steps:
the dehydrated crude oil enters a gas stripping desulfurization tower 2 after the temperature of the dehydrated crude oil is raised by a heater 1, the gas stripping desulfurization tower 2 flashes out hydrogen sulfide dissolved in the crude oil by utilizing the action of high temperature, low pressure and gas stripping to obtain desulfurized crude oil, the desulfurized crude oil is discharged from a second outlet of the gas stripping desulfurization tower 2, impurities are filtered by a booster pump filter 7, the pressure of the desulfurized crude oil is raised by utilizing a booster pump 8, the temperature of the desulfurized crude oil is controlled by a second cooler 9, and the desulfurized crude oil is conveyed to a downstream qualified crude oil conveying flow (the liquid level of the gas stripping desulfurization tower 2 is controlled by a liquid level regulating valve 10 on an outlet; gas containing hydrogen sulfide flashed from crude oil by the gas stripping desulfurization tower 2 is discharged from a first outlet of the gas stripping desulfurization tower, is pressurized by a compressor 3 (specifically a low-pressure gas recovery compressor), is converged with sulfur-containing associated gas conveyed by an oil field associated gas conveying pipe 14, is subjected to temperature control by a first cooler 4, and then enters a coalescing separator 5 to remove liquid drops in natural gas, the sulfur-containing natural gas enters a desulfurization tower 6 to be contacted with a complex iron solution, and the hydrogen sulfide content of the desulfurized natural gas reaches less than or equal to 20 ppm; most of the desulfurized natural gas is discharged to a downstream qualified gas conveying flow through a second outlet of the desulfurizing tower 6, and a small part of the natural gas without sulfur is used as stripping gas to circularly enter the stripping desulfurizing tower 2 again. And in the initial starting stage of the device or when the gas quantity associated with desulfurization is insufficient, a nitrogen gas source needs to be started to supplement the gas stripping gas quantity. The gas stripping gas flow is controlled by a flow regulating valve.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a desulfurization processing apparatus is united to offshore oil field crude oil and associated gas which characterized in that includes following part:
the inlet of the heater (1) is connected with the outlet of the dehydrated crude oil conveying pipe (13);
the first inlet of the stripping desulfurization tower (2) is connected with the outlet of the heater (1), the first outlet of the stripping desulfurization tower (2) is connected with the input end of the compressor (3), and the second outlet of the stripping desulfurization tower (2) is a desulfurized crude oil output port;
a first cooler (4), wherein the inlet of the first cooler (4) is connected with the output end of the compressor (3) and the outlet of an oilfield associated gas conveying pipe (14);
a coalescer (5), the inlet of the coalescer (5) being connected to the outlet of the first cooler (4);
the first entry of desulfurizing tower (6) with the exit linkage of coalescence-separation ware (5), the first export of desulfurizing tower (6) and the entry linkage of complex ferrous redox ware (16), the export of complex ferrous redox ware (16) with the second entry linkage of desulfurizing tower (6), the second export of desulfurizing tower (6) is used for exporting the desulfurization natural gas, the second exit of desulfurizing tower (6) still be provided with branch export be used for with the second entry linkage of gas stripping desulfurizing tower (2).
2. The offshore oilfield crude oil and associated gas combined desulfurization treatment device according to claim 1, wherein the desulfurization tower (6) comprises a tank body (601), the upper part of the tank body (601) is provided with a filtering wire mesh (602), the middle part of the tank body (601) is provided with a plurality of grating plates, the lower part of the tank body (601) is provided with a distribution pipe (607), the filtering wire mesh (602) is configured to filter out liquid and sulfur particles in desulfurized natural gas, the grating plates are configured to increase the contact area and contact time of the natural gas and the complexing iron solution, and the distribution pipe (607) is configured to uniformly distribute sulfur-containing natural gas to the bottom of the tank body (601).
3. The offshore oilfield crude oil and associated gas combined desulfurization processing unit of claim 2, wherein the plurality of grid plates comprises a plurality of layers of vertically arranged second grid plates (606), wherein the second grid plates (606) are provided with grid holes, and the second grid plates (606) are configured to accelerate flow distribution of the complexed iron solution among the plurality of grid plates.
4. The offshore oilfield crude oil and associated gas combined desulfurization treatment device according to claim 3, wherein the plurality of grid plates further comprises a first grid plate (605) disposed above the second grid plate (606), the first grid plate (605) is also provided with the grid holes and is a horizontal grid plate, and the first grid plate (605) is configured to accelerate the flow of the complex iron solution and the escape of the desulfurized natural gas.
5. The offshore oilfield crude oil and associated gas combined desulfurization processing device according to claim 1, further comprising a booster pump filter (7), a booster pump (8) and a second cooler (9), wherein an inlet of the booster pump filter (7) is connected with a second outlet of the stripping desulfurization tower (2), an outlet of the booster pump filter (7) is connected with an input end of the booster pump (8), an output end of the booster pump (8) is connected with an inlet of the second cooler (9), and an outlet of the second cooler (9) is connected with an inlet of the desulfurized crude oil storage tank (18).
6. The offshore oilfield crude oil and associated gas combined desulfurization processing unit according to claim 1, further comprising a nitrogen storage tank (15), wherein an outlet of the nitrogen storage tank (15) is connected with a second inlet of the stripping desulfurization tower (2), and a stripping gas flow regulating valve (11) and a standby nitrogen switching valve (12) are arranged on a pipeline connected with the nitrogen storage tank (15).
7. The offshore oilfield crude oil and associated gas combined desulfurization treatment device according to claim 4, wherein the complexed ferrous redox reactor (16) further comprises a complexed iron solution spray nozzle (1601) disposed in the desulfurization tower (6) and above the first grid plate (605).
8. The offshore oilfield crude oil and associated gas combined desulfurization treatment device according to claim 3 or 4, wherein the diameter of the grid holes is 3-5 cm.
9. The offshore oilfield crude oil and associated gas combined desulfurization treatment device according to claim 3, wherein the distance between adjacent second grid plates (606) is 12-15 cm.
10. The method for processing the offshore oilfield crude oil and associated gas combined desulfurization processing unit according to claim 5, comprising the steps of:
the dehydrated crude oil enters the gas stripping desulfurization tower (2) after the temperature of the dehydrated crude oil is raised by the heater (1), hydrogen sulfide dissolved in the crude oil is flashed out by the gas stripping desulfurization tower (2) to obtain desulfurized crude oil, the desulfurized crude oil is discharged from a second outlet of the gas stripping desulfurization tower (2), impurities are filtered by the booster pump filter (7), the pressure of the desulfurized crude oil is raised by the booster pump (8), and the desulfurized crude oil is conveyed to a downstream qualified crude oil conveying flow after the temperature is controlled by the second cooler (9); the stripping desulfurization tower (2) discharges gas containing hydrogen sulfide flashed from crude oil from a first outlet of the stripping desulfurization tower, the gas is pressurized by the compressor (3), is merged with the sulfur-containing associated gas conveyed by the oilfield associated gas conveying pipe (14), is subjected to temperature control by the first cooler (4), enters the coalescence separator (5) to remove liquid drops in natural gas, the sulfur-containing natural gas enters the desulfurization tower (6) to be contacted with the complex iron solution, most of the desulfurized natural gas is discharged to a downstream qualified gas conveying flow through a second outlet of the desulfurization tower (6), and a small part of the natural gas without sulfur is used as stripping gas to circulate and enter the stripping desulfurization tower (2) again.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114806665A (en) * | 2022-05-18 | 2022-07-29 | 西南石油大学 | Complex iron desulfurization process flow suitable for medium-sulfur shale oil associated gas |
| CN114933923A (en) * | 2022-06-15 | 2022-08-23 | 重庆和友实业股份有限公司 | High-temperature desulfurization device for synthetic ammonia natural gas |
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| CN114933923A (en) * | 2022-06-15 | 2022-08-23 | 重庆和友实业股份有限公司 | High-temperature desulfurization device for synthetic ammonia natural gas |
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