CN108815881B - Hydrate slurry processing device and method - Google Patents
Hydrate slurry processing device and method Download PDFInfo
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- CN108815881B CN108815881B CN201810886506.5A CN201810886506A CN108815881B CN 108815881 B CN108815881 B CN 108815881B CN 201810886506 A CN201810886506 A CN 201810886506A CN 108815881 B CN108815881 B CN 108815881B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
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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
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Abstract
The invention relates to a device and a method for processing hydrate slurry, belonging to the technical field of natural gas hydrate application. Designing four groups of dewatering pipes with identical shapes and sizes, and distributing the flow of hydrate slurry entering different dewatering pipes according to the bending degree and the bending direction of inlet pipelines of the dewatering pipes; the dehydration pipe connector is designed, the position of the outlet of the dehydration pipe changes along with the rotation movement of the dehydration pipe, and the hydrate slurry is dehydrated and discharged at fixed time by the positions of the outlet of the dehydration pipe and the opening of the bottom of the dehydration pipe connector at different moments. The processing device and the processing method of the hydrate slurry mainly aim at a continuous production system of the hydrate industrialization, solve the problems of harsh production conditions, long production time, large shipment difficulty, low natural gas conveying efficiency in the hydrate slurry conveying process and the like of the dry hydrate, and can realize synchronous dehydration treatment and storage of the hydrate slurry and self-press loading and conveying of the hydrate slurry in the hydrate production process.
Description
Technical Field
The invention relates to a device and a method for processing hydrate slurry, belonging to the technical field of natural gas hydrate application.
Background
The natural gas hydrate is generally dehydrated and then stored and transported. The transportation mode of the NGH mainly comprises dry hydrate transportation, hydrate slurry transportation and NGH oil slurry transportation.
The dry hydrate transportation is carried in a ship similar to an LNG carrier, the operation is simple, the research and development work of Japan three-well engineering and shipbuilding companies develops a method for processing natural gas hydrate into hydrate snowballs with the diameter of 5-100 mm, and the yield reaches 600t/d. However, the dry hydrate generation cost is high, and the shipment of the dry hydrate has certain difficulty.
The NGH oil slurry is conveyed by fully mixing the prepared dry hydrate with crude oil frozen to the temperature of minus 10 ℃ to form natural gas hydrate oil slurry suspended in the crude oil, and conveying the natural gas hydrate oil slurry by adopting an oil conveying pipeline which is good in heat insulation and sealing and short in conveying distance by adopting a heat insulation oil tanker under the condition of being close to normal pressure.
The hydrate slurry is transported by pumping the hydrate slurry with the consistency of 1:1 after two times of dehydration into the heat-insulating sealed cabin on the double-shell transport ship, compared with the dry hydrate transportation and the NGH oil slurry transportation, the operation of the hydrate slurry transportation is simple, the formation condition of the hydrate slurry is easier to realize, the transportation process is simpler, and the effective utilization rate of the transportation capacity is low.
Therefore, the hydrate slurry processing device is designed, and the hydrate slurry processing method matched with the device is provided, so that the device has important practical significance for improving the conveying capacity of the hydrate slurry and reducing the production and operation cost of an oil-gas field.
Disclosure of Invention
The invention aims to provide a hydrate slurry processing device and method, which are used for separating hydrate particles and water in a natural gas hydrate production process, and solve the problems of severe production requirements, long production time, large shipment difficulty and the like of dry hydrates. The device synchronously removes free water in the hydrate slurry in the production process of the hydrate, reduces the production conditions and the production operation cost of the hydrate, and greatly improves the conveying efficiency of the hydrate slurry.
The invention mainly solves the following problems:
(1) The first, second, third and fourth dewatering pipes are designed, the hydrate slurry is distributed into the hydrate slurry flow of different dewatering pipes according to the bending degree and the bending direction of the inlet pipeline of the dewatering pipe at different moments, and the dewatering treatment of the hydrate slurry is realized through continuous rotary movement of the dewatering pipes.
(2) The dehydration pipe connector is designed, the position of the outlet of the dehydration pipe is changed continuously along with the rotation movement of the dehydration pipe, and the hydrate slurry is dehydrated and discharged at regular time according to the positions of the outlet of the dehydration pipe and the opening of the bottom of the dehydration pipe connector at different moments.
(3) The hydrate slurry processing method is designed, free water removal and recycling of the externally conveyed slurry and short-term storage of the slurry are carried out, and the reaction gas is utilized to pressurize the slurry storage unit, so that automatic loading and transportation of the hydrate slurry are realized.
In order to achieve the above object, the present invention has the following technical scheme.
The hydrate slurry processing device comprises a dehydration treatment unit 5, a slurry storage unit 6, a first slurry discharge pipe 7, a second slurry discharge pipe 8, a third slurry discharge pipe 9, a first liquid return pipe 10, a second liquid return pipe 11, a natural gas recovery pipe 12 and a slurry storage tank pressurizing pipe 13;
the dehydration treatment unit 5 is respectively connected with the hydration reaction unit 3, the slurry storage unit 6 and the liquid storage unit 1 through a first slurry outer drain pipe 7, a second slurry outer drain pipe 8 and a second liquid return pipe 11, and the slurry storage unit 6 is respectively connected with the liquid storage unit 1, the hydration reaction unit 3 and the gas storage unit 2 through a first liquid return pipe 10, a natural gas recovery pipe 12 and a slurry storage tank pressurizing pipe 13.
Further, the dehydration unit 5 includes a mounting base 14, a mounting frame 15, a first connector 16, a first dehydration pipe 17, a second dehydration pipe 18, a third dehydration pipe 19, a fourth dehydration pipe 20, a dehydration outer cylinder 21, and a second connector 22;
the mounting seat 14 is mounted on the mounting frame 15 and is connected with the first connector 16, the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19, the fourth dewatering pipe 20 and the dewatering outer cylinder 21 through the second connector 22, and the dewatering outer cylinder 21 is arranged outside the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20 and is connected with the first slurry discharging pipe 7 through the first connector 16.
Further, the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20 are bent pipes with identical shapes and sizes, and the central angle of the bent pipes is 20-45 degrees.
Further, the walls of the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20 are provided with a plurality of small holes.
Further, a round hole is formed at the bottom of the second connector 22, and the size of the round hole is the same as the pipe diameters of the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20.
Further, a method for processing and treating hydrate slurry comprises the following steps;
s1, dehydration treatment of hydrate slurry
S11, carrying out hydration reaction on water of the liquid storage unit 1 and natural gas of the gas storage unit 2 in the hydration reaction unit 3, enabling the generated hydrate slurry to enter the rotary dehydration treatment unit 5 in a self-flowing mode, and distributing the flow of the hydrate slurry entering different dehydration pipes according to the bending degree and the bending direction of inlet pipelines of the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19 and the fourth dehydration pipe 20;
s12, centrifugally dehydrating the hydrate slurry under the rotation action of a dehydration pipe, wherein water in the slurry enters a dehydration outer cylinder 21, and enters a liquid storage unit 1 through a second liquid return pipe 11, and hydrate particles continuously move in a first dehydration pipe 17, a second dehydration pipe 18, a third dehydration pipe 19 and a fourth dehydration pipe 20;
s13, when the outlet positions of the four groups of dewatering pipes are staggered from the 6 o 'clock position, the hydrate slurry is dewatered in the dewatering pipes until the outlet position of one dewatering pipe is aligned with the 6 o' clock position, the outlet position of the dewatering pipe is aligned with the round hole at the bottom of the second connector 22, and hydrate particles in the pipe enter the slurry storage unit 6 through the second slurry discharge pipe 8;
s2, storing and transporting hydrate slurry
The hydrate slurry enters the slurry storage unit 6 for temporary storage, and when the slurry transportation tank truck arrives at the position, the slurry storage unit 6 is connected with the slurry transportation tank truck, a valve of a slurry storage tank pressurizing pipe 13 is opened, the slurry storage tank is pressurized by compressed natural gas, and the hydrate slurry flows into the slurry transportation tank truck from the slurry storage tank.
The beneficial effects of the invention are as follows:
(1) The invention mainly aims at a continuous industrial production system of the hydrate, designs a dehydration treatment unit and a slurry storage unit, realizes dehydration treatment of the hydrate slurry and temporary storage of the hydrate slurry in the production process of the hydrate, and solves the problems of harsh production conditions, long production time, large shipping difficulty, low natural gas conveying efficiency of the hydrate slurry and the like of the dry hydrate.
(2) Four groups of dewatering pipes with identical shapes and sizes are designed, the flow distribution condition of the hydrate slurry in the dewatering pipes is determined through the bending degree and the bending direction of inlet pipelines of the dewatering pipes, and the timed dewatering and the timed discharge of the hydrate slurry are realized through outlet positions of the dewatering pipes.
(3) The hydrate slurry processing method is designed to realize the efficient removal of free water in the hydrate slurry, the storage of the hydrate slurry and the transportation of the self-pressing loading vehicle.
Drawings
FIG. 1 is a schematic view of an apparatus for processing a hydrate slurry according to an embodiment of the present invention.
FIG. 2 is a flow chart of a hydrate slurry processing process in an embodiment of the present invention.
Fig. 3 is a schematic view showing the structure of a mounting bracket of a dehydration processing unit in the embodiment of the present invention.
Fig. 4 is a three view of a hydrate slurry dewatering treatment unit according to an embodiment of the present invention.
Fig. 5 is a bottom view of the dewatering unit when the hydrate slurry is not flowing out of the dewatering unit in an embodiment of the present invention.
Fig. 6 is a bottom view of the dewatering unit as the hydrate slurry exits the dewatering unit in an embodiment of the present invention.
Fig. 7 is a schematic structural view of a slurry transport tank car according to an embodiment of the present invention.
Fig. 8 is a cross-sectional view of a slurry transport tank car in an embodiment of the invention.
Detailed Description
The following description of specific embodiments of the invention is provided in connection with the accompanying drawings to provide a better understanding of the invention.
Examples
In this embodiment, fig. 1 is a schematic diagram of a hydrate slurry processing apparatus according to an embodiment of the present invention, wherein the hydrate slurry processing apparatus includes a dehydration processing unit 5, a slurry storage unit 6, a first slurry discharge pipe 7, a second slurry discharge pipe 8, a third slurry discharge pipe 9, a first liquid return pipe 10, a second liquid return pipe 11, a natural gas recovery pipe 12, and a slurry storage tank pressurization pipe 13.
The dehydration treatment unit 5 is respectively connected with the hydration reaction unit 3, the slurry storage unit 6 and the liquid storage unit 1 through a first slurry outer drain pipe 7, a second slurry outer drain pipe 8 and a second liquid return pipe 11, and the slurry storage unit 6 is respectively connected with the liquid storage unit 1, the hydration reaction unit 3 and the gas storage unit 2 through a first liquid return pipe 10, a natural gas recovery pipe 12 and a slurry storage tank pressurizing pipe 13.
Fig. 2 is a flow chart of processing and treating hydrate slurry in the embodiment of the invention, the hydration reaction unit 3 is connected with the liquid storage unit 1 and the gas storage unit 2 through a first slurry discharge pipe 7 and a natural gas recovery pipe 12 respectively with the dehydration treatment unit 5 and the slurry storage unit 6, the liquid storage unit 1 is connected with the dehydration treatment unit 5 and the slurry storage unit 6 through a first liquid return pipe 10 and a second liquid return pipe 11 respectively, the gas storage unit 2 is connected with the slurry storage unit 6 through a slurry storage tank pressurizing pipe 13, and the slurry storage unit 6 is connected with the dehydration treatment unit 5 and a slurry transportation tank truck respectively through a second slurry discharge pipe 8 and a third slurry discharge pipe 9.
Fig. 3 is a schematic structural view of a mounting support of a dewatering unit according to an embodiment of the present invention, and fig. 4 is a three-dimensional view of a dewatering unit for a hydrate slurry according to an embodiment of the present invention. The dehydration treatment unit 5 includes a mounting base 14, a mounting frame 15, a first connector 16, a first dehydration pipe 17, a second dehydration pipe 18, a third dehydration pipe 19, a fourth dehydration pipe 20, a dehydration outer cylinder 21, and a second connector 22.
The installation seat 14 is installed on the installation frame 15, and is connected with the first slurry discharge pipe 7 through the first connector 16, the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19, the fourth dewatering pipe 20 and the dewatering outer cylinder 21 through the second connector 22, wherein the dewatering outer cylinder 21 is arranged outside the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20. The first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20 are bent pipes with identical shapes and sizes, the wall surface is provided with a plurality of small holes, and the central angle of the small holes is 20-45 degrees. The bottom of the second connector 22 is provided with a round hole with the same pipe diameter as the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20.
Fig. 5 is a bottom view of the dewatering unit when the hydrate slurry does not flow out of the dewatering unit according to the embodiment of the present invention, and fig. 6 is a bottom view of the dewatering unit when the hydrate slurry flows out of the dewatering unit according to the embodiment of the present invention. As shown in fig. 5, the hydrate slurry is dehydrated in a dehydration treatment unit, and during the rotation of the dehydration treatment unit, water in the slurry enters a dehydration outer cylinder 21 through centrifugal action, and enters a liquid storage unit 1 through a second liquid return pipe 11, and hydrate particles continuously move in a first dehydration pipe 17, a second dehydration pipe 18, a third dehydration pipe 19 and a fourth dehydration pipe 20. As shown in fig. 6, the hydrate slurry is automatically discharged into the slurry storage unit after dehydration treatment, when the outlet position of one of the first dewatering pipe 17, the second dewatering pipe 18, the third dewatering pipe 19 and the fourth dewatering pipe 20 is aligned with the 6 o' clock position, the outlet position of the dewatering pipe is aligned with the circular hole at the bottom of the second connector 22, and the hydrate particles in the pipe enter the slurry storage unit 6 through the second slurry discharge pipe 8.
The processing method of the hydrate slurry comprises the following steps:
s1, dehydration treatment of hydrate slurry
S11, carrying out hydration reaction on water of the liquid storage unit 1 and natural gas of the gas storage unit 2 in the hydration reaction unit 3, enabling the generated hydrate slurry to enter the rotary dehydration treatment unit 5 in a self-flowing mode, and distributing the flow of the hydrate slurry entering different dehydration pipes according to the bending degree and the bending direction of inlet pipelines of the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19 and the fourth dehydration pipe 20;
s12, centrifugally dehydrating the hydrate slurry under the rotation action of a dehydration pipe, wherein water in the slurry enters a dehydration outer cylinder 21, and enters a liquid storage unit 1 through a second liquid return pipe 11, and hydrate particles continuously move in a first dehydration pipe 17, a second dehydration pipe 18, a third dehydration pipe 19 and a fourth dehydration pipe 20;
s13, when the outlet positions of the four groups of dewatering pipes are staggered from the 6 o 'clock position, the hydrate slurry is dewatered in the dewatering pipes until the outlet position of one dewatering pipe is aligned with the 6 o' clock position, the outlet position of the dewatering pipe is aligned with the round hole at the bottom of the second connector 22, and hydrate particles in the pipe enter the slurry storage unit 6 through the second slurry discharge pipe 8;
s2, storing and transporting hydrate slurry
The hydrate slurry enters the slurry storage unit 6 for temporary storage, and when the slurry transportation tank truck arrives at the position, the slurry storage unit 6 is connected with the slurry transportation tank truck, a valve of a slurry storage tank pressurizing pipe 13 is opened, the slurry storage tank is pressurized by compressed natural gas, and the hydrate slurry flows into the slurry transportation tank truck from the slurry storage tank.
Fig. 7 is a schematic structural view of a slurry transport tank car according to an embodiment of the present invention, and fig. 8 is a sectional view of the slurry transport tank car according to an embodiment of the present invention. The slurry transportation tank truck comprises a truck body, a heat-insulating outer tank 23 and a dehydration separation inner tank 27, wherein a plurality of small holes are formed in the wall surface of the dehydration separation inner tank 27 and are arranged in the heat-insulating outer tank 23, and the heat-insulating outer tank 23 is arranged on the truck body. The slurry transportation tank truck receives the hydrate slurry from the slurry storage unit 6, and after the slurry transportation tank truck is transported to a destination, the slurry transportation tank truck is connected with a natural gas receiving pipeline, hot water filling is carried out in the slurry transportation tank truck through a hot water filling pipe 26, the hydrate is decomposed into water and natural gas, the natural gas enters the natural gas receiving pipeline through a liquid inlet and exhaust multipurpose pipe, and the decomposed water is discharged through a residual liquid discharge pipe 24.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (5)
1. A hydrate slurry processing device is characterized in that: the device comprises a dehydration treatment unit (5), a slurry storage unit (6), a first slurry discharge pipe (7), a second slurry discharge pipe (8), a third slurry discharge pipe (9), a first liquid return pipe (10), a second liquid return pipe (11), a natural gas recovery pipe (12) and a slurry storage tank pressurizing pipe (13);
the dehydration treatment unit (5) is respectively connected with the hydration reaction unit (3), the slurry storage unit (6) and the liquid storage unit (1) through a first slurry outer drain pipe (7), a second slurry outer drain pipe (8) and a second liquid return pipe (11), and the slurry storage unit (6) is respectively connected with the liquid storage unit (1), the hydration reaction unit (3) and the gas storage unit (2) through a first liquid return pipe (10), a natural gas recovery pipe (12) and a slurry storage tank booster pipe (13);
the dehydration treatment unit (5) comprises a mounting seat (14), a mounting frame (15), a first connector (16), a first dehydration pipe (17), a second dehydration pipe (18), a third dehydration pipe (19), a fourth dehydration pipe (20), a dehydration outer cylinder (21) and a second connector (22);
the installation seat (14) is installed on the installation frame (15), is connected with the first connector (16), the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19), the fourth dewatering pipe (20) and the dewatering outer cylinder (21) through the second connector (22), and the dewatering outer cylinder (21) is arranged outside the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19) and the fourth dewatering pipe (20) and is connected with the first slurry discharge pipe (7) through the first connector (16);
the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19) and the fourth dewatering pipe (20) are bent pipes with identical shapes and sizes, and a round hole is formed in the bottom of the second connector (22);
the hydrate slurry is centrifugally dehydrated under the rotation action of the dehydration pipe, and when the outlet position of the dehydration pipe is aligned with the round hole at the bottom of the second connector (22), hydrate particles in the dehydration pipe enter the slurry storage unit (6) through the second slurry discharge pipe (8).
2. The hydrate slurry processing apparatus according to claim 1, wherein: the central angles of the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19) and the fourth dewatering pipe (20) are 20-45 degrees.
3. The hydrate slurry processing apparatus according to claim 1, wherein: the walls of the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19) and the fourth dewatering pipe (20) are provided with a plurality of small holes.
4. The hydrate slurry processing apparatus according to claim 1, wherein: the size of the round hole at the bottom of the second connector (22) is the same as the pipe diameters of the first dewatering pipe (17), the second dewatering pipe (18), the third dewatering pipe (19) and the fourth dewatering pipe (20).
5. A processing method of hydrate slurry is characterized in that: comprises the following steps of;
s1, dehydration treatment of hydrate slurry
S11, carrying out hydration reaction on water of the liquid storage unit (1) and natural gas of the gas storage unit (2) in the hydration reaction unit (3), enabling the generated hydrate slurry to enter the rotary dehydration treatment unit (5) in a self-flowing mode, and distributing the flow of the hydrate slurry entering different dehydration pipes according to the bending degree and the bending direction of inlet pipelines of the first dehydration pipe (17), the second dehydration pipe (18), the third dehydration pipe (19) and the fourth dehydration pipe (20);
s12, centrifugally dehydrating the hydrate slurry under the rotation action of a dehydration pipe, enabling water in the slurry to enter a dehydration outer cylinder (21), enabling water to enter a liquid storage unit (1) through a second liquid return pipe (11), and enabling hydrate particles to continuously move in a first dehydration pipe (17), a second dehydration pipe (18), a third dehydration pipe (19) and a fourth dehydration pipe (20);
s13, when the outlet positions of the four groups of dewatering pipes are staggered from the 6 o 'clock position, the hydrate slurry is dewatered in the dewatering pipes until the outlet position of one dewatering pipe is aligned to the 6 o' clock position, the outlet position of the dewatering pipe is aligned to a round hole at the bottom of the second connector (22), and hydrate particles in the dewatering pipe enter the slurry storage unit (6) through a second slurry discharge pipe (8);
s2, storing and transporting hydrate slurry
The hydrate slurry enters the slurry storage unit (6) for temporary storage, and after the slurry transportation tank truck arrives at the position, the slurry storage unit (6) is connected with the slurry transportation tank truck, a valve of a slurry storage tank pressurizing pipe (13) is opened, the slurry storage tank is pressurized by compressed natural gas, and the hydrate slurry flows into the slurry transportation tank truck from the slurry storage tank.
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| CN110345384B (en) * | 2019-08-20 | 2024-03-26 | 西南石油大学 | Shale gas hydrate slurry rapid transferring and unloading device and method |
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