CN108815881A - A kind of hydrate slurry processing device and method - Google Patents

Abstract

The invention relates to a hydrate slurry processing device and method, and belongs to the technical field of natural gas hydrate application. Design four sets of dehydration pipes with the same shape and size, and distribute the hydrate slurry flow into different dehydration pipes according to the bending degree and bending direction of the dehydration pipe inlet pipeline; design the dehydration pipe connector, and the outlet position of the dehydration pipe changes with the rotation of the dehydration pipe. The position of the outlet of the dehydration pipe and the opening at the bottom of the dehydration pipe connector at different times can be changed to realize the dehydration and discharge treatment of the hydrate slurry at regular intervals. The hydrate slurry processing device and method described in the present invention are mainly aimed at the industrialized continuous production system of hydrate, which overcomes harsh dry hydrate production conditions, long production time, difficult shipment and low natural gas transportation efficiency in hydrate slurry transportation. In the hydrate production process, the dehydration treatment and storage of hydrate slurry, and the self-pressurized loading and transportation of hydrate slurry can be realized simultaneously.

Description

A hydrate slurry processing device and method

technical field

The invention relates to a hydrate slurry processing device and method, and belongs to the technical field of natural gas hydrate application.

Background technique

After the natural gas hydrate is formed, it is usually stored and transported after dehydration processing. The transportation methods of NGH mainly include dry hydrate transportation, hydrate slurry transportation and NGH oil slurry transportation.

Dry hydrate transportation is carried in ships similar to LNG carriers, and the operation is relatively simple. The research team of Japan’s Mitsui Engineering and Shipbuilding Co., Ltd. has successfully developed a natural gas hydrate into a hydrate snowball with a diameter of 5-100mm. method, and the output has reached 600t/d. However, the generation cost of dry hydrate is relatively high, and the shipment of dry hydrate is difficult.

The transportation of NGH oil slurry is to fully mix the prepared dry hydrate with crude oil frozen to -10°C to form a natural gas hydrate oil slurry suspended in crude oil. Under the condition of close to normal pressure, an adiabatic tanker is used for heat insulation and sealing. For oil pipeline transportation with a short transportation distance, this process has a high effective utilization rate of natural gas transportation and simple operation, but the cost of dry hydrate formation is relatively high, and the technology is not yet mature.

The hydrate slurry is pumped into the heat-insulated and sealed compartment on the double-hull transport ship after twice dehydration, and the hydrate slurry with a consistency of 1:1 is transported. Compared with dry hydrate transportation and NGH oil slurry transportation, hydrate slurry The transportation operation is simple, the hydrate slurry formation conditions are easier to realize, and the shipment process is simpler, but the effective utilization rate of its transportation capacity is low.

Therefore, designing a hydrate slurry processing device and providing a hydrate slurry processing method for the device is of great practical significance for improving the hydrate slurry transport capacity and reducing the production and operation costs of oil and gas fields.

Contents of the invention

The object of the present invention is to provide a hydrate slurry processing device and method for separating hydrate particles and water in the natural gas hydrate production process, which overcomes the strict requirements for dry hydrate production, long production time, and difficult shipment And other issues. The device simultaneously removes the free water in the hydrate slurry during the hydrate production process, reduces the hydrate production conditions and production operation costs, and greatly improves the transport efficiency of the hydrate slurry.

The present invention mainly solves the following problems:

(1) Design the first, second, third, and fourth dehydration pipes. The hydrate slurry flows into different dehydration pipes are distributed according to the bending degree and bending direction of the dehydration pipe inlet pipeline at different times, and the hydrate slurry flows through the dehydration pipes continuously. The rotary motion realizes the dehydration treatment of the hydrate slurry.

(2) Design the dehydration pipe connector. The outlet position of the dehydration pipe changes continuously with the rotation of the dehydration pipe. According to the position of the outlet of the dehydration pipe and the opening position at the bottom of the dehydration pipe connector at different times, the timing dehydration of the hydrate slurry and the timing discharge of the slurry are realized. .

(3) Design the processing method of hydrate slurry, remove the free water of the external slurry, recycle and temporarily store the slurry, use the reaction gas to pressurize the slurry storage unit, and realize the automatic loading and transportation of the hydrate slurry .

In order to achieve the above object, the technical solution of the present invention is as follows.

A hydrate slurry processing device includes 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, and a first liquid return pipe 10 , the second liquid return pipe 11, the natural gas recovery pipe 12, the booster pipe 13 of the slurry storage tank;

The dehydration treatment unit 5 is connected to the hydration reaction unit 3, the slurry storage unit 6, and the liquid storage unit 1 respectively through the first slurry discharge pipe 7, the second slurry discharge pipe 8, and the second liquid return pipe 11. The slurry storage unit 6 is connected with the liquid storage unit 1, the hydration reaction unit 3, and the gas storage unit 2 respectively through the first liquid return pipe 10, the natural gas recovery pipe 12, and the slurry storage tank booster pipe 13.

Further, 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, second connector 22;

The mounting seat 14 is installed on the mounting frame 15, and the first connector 16, the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, the fourth dehydration pipe 20, The dehydration outer cylinder 21 is connected, and the dehydration outer cylinder 21 is arranged outside the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, and the fourth dehydration pipe 20, through the first connector 16 and the first slurry Outlet pipe 7 is connected.

Further, the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, and the fourth dehydration pipe 20 are bent pipes with the same shape and size, and their central angles are 20°-45°.

Further, the walls of the first dehydration pipe 17 , the second dehydration pipe 18 , the third dehydration pipe 19 and the fourth dehydration pipe 20 are provided with several small holes.

Further, a round hole is provided at the bottom of the second connector 22 , the size of which is the same as that of the first dehydration pipe 17 , the second dehydration pipe 18 , the third dehydration pipe 19 , and the fourth dehydration pipe 20 .

Further, a hydrate slurry processing method includes the following steps;

S1. Hydrate slurry dehydration treatment

S11. The water in the liquid storage unit 1 and the natural gas in the gas storage unit 2 undergo hydration reaction in the hydration reaction unit 3, and the generated hydrate slurry enters the rotating dehydration treatment unit 5 through gravity flow. According to the first dehydration pipe 17, the second Dehydration pipe 18, third dehydration pipe 19, fourth dehydration pipe 20 inlet pipeline bending degree and bending direction distribute the flow of hydrate slurry entering different dehydration pipes;

S12. The hydrate slurry is subjected to centrifugal dehydration under the rotation of the dehydration pipe. The water in the slurry enters the dehydration outer cylinder 21 and enters the liquid storage unit 1 through the second liquid return pipe 11. The hydrate particles are in the first dehydration pipe 17, the second Continuous movement in two dehydration pipes 18, the third dehydration pipe 19, and the fourth dehydration pipe 20;

S13. When the outlet positions of the four sets of dehydration pipes are staggered from the 6 o'clock position, the hydrate slurry is dehydrated in the dehydration pipes until the outlet position of a certain dehydration pipe is aligned with the 6 o'clock position, and the outlet position of the dehydration pipe is aligned with the 6 o'clock position. The second connector 22 has a round hole at the bottom, and the hydrate particles in the tube enter the slurry storage unit 6 through the second slurry discharge pipe 8;

S2. Storage and transportation of hydrate slurry

The hydrate slurry enters the slurry storage unit 6 for short-term storage. When the slurry transport tanker arrives there, connect the slurry storage unit 6 with the slurry transport tanker, open the valve of the pressurization pipe 13 of the slurry storage tank, and pressurize the natural gas to the slurry storage tank. Pressurization is carried out, and the hydrate slurry flows from the slurry storage tank into the slurry transport tanker.

The beneficial effects of the invention are:

(1) The present invention is mainly aimed at the industrialized continuous production system of hydrate, and designs a dehydration treatment unit and a slurry storage unit to realize the dehydration treatment of hydrate slurry and the short-term storage of hydrate slurry in the hydrate production process, and overcome the severe dry hydrate production conditions. There are many problems such as harshness, long production time, difficult shipment and low efficiency of natural gas transportation of hydrate slurry.

(2) Design four sets of dehydration pipes with the same shape and size. The flow distribution of hydrate slurry in the dehydration pipes is determined by the bending degree and bending direction of the inlet pipelines of the dehydration pipes. The dehydration of the hydrate slurry and the dehydration of the hydrate slurry are realized through the outlet position of the dehydration pipes. Timed discharge.

(3) Design hydrate slurry processing methods to achieve efficient removal of free water in hydrate slurry, storage of hydrate slurry and self-pressurized loading and transportation.

Description of drawings

Fig. 1 is a schematic diagram of a hydrate slurry processing device in an embodiment of the present invention.

Fig. 2 is a flow chart of hydrate slurry processing in the embodiment of the present invention.

Fig. 3 is a schematic structural view of the mounting support of the dehydration treatment unit in the embodiment of the present invention.

Fig. 4 is a three-view diagram of the hydrate slurry dehydration treatment unit in the embodiment of the present invention.

Fig. 5 is a bottom view of the dehydration treatment unit when the hydrate slurry does not flow out of the dehydration treatment unit in the embodiment of the present invention.

Fig. 6 is a bottom view of the dehydration treatment unit when the hydrate slurry flows out of the dehydration treatment unit in the embodiment of the present invention.

Fig. 7 is a schematic structural view of a slurry transport tank car in an embodiment of the present invention.

Fig. 8 is a sectional view of a slurry transport tank car in an embodiment of the present invention.

Detailed ways

Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so as to better understand the present invention.

Example

In this embodiment, Fig. 1 is a schematic diagram of the hydrate slurry processing device in the embodiment of the present invention. The hydrate slurry processing device includes a dehydration treatment unit 5, a slurry storage unit 6, a first slurry discharge pipe 7, a second Slurry discharge pipe 8 , third slurry discharge pipe 9 , first liquid return pipe 10 , second liquid return pipe 11 , natural gas recovery pipe 12 , and slurry storage tank booster pipe 13 .

The dehydration treatment unit 5 is connected to the hydration reaction unit 3, the slurry storage unit 6, and the liquid storage unit 1 respectively through the first slurry discharge pipe 7, the second slurry discharge pipe 8, and the second liquid return pipe 11. The slurry storage unit 6 is connected with the liquid storage unit 1, the hydration reaction unit 3, and the gas storage unit 2 respectively through the first liquid return pipe 10, the natural gas recovery pipe 12, and the slurry storage tank booster pipe 13.

Fig. 2 is a flow chart of hydrate slurry processing in the embodiment of the present invention. The hydration reaction unit 3, the liquid storage unit 1, and the gas storage unit 2 are respectively connected to the dehydration treatment unit through the first slurry discharge pipe 7 and the natural gas recovery pipe 12. 5. The slurry storage unit 6 is connected, the liquid storage unit 1 is respectively connected to the dehydration processing unit 5 and the slurry storage unit 6 through the first liquid return pipe 10 and the second liquid return pipe 11, and the gas storage unit 2 is connected through the The slurry storage tank booster pipe 13 is connected to the slurry storage unit 6, and the slurry storage unit 6 is respectively connected to the dehydration treatment unit 5 and the slurry transport tanker through the second slurry discharge pipe 8 and the third slurry discharge pipe 9.

Fig. 3 is a schematic structural view of the mounting support of the dehydration treatment unit in the embodiment of the present invention, and Fig. 4 is a three-view view of the hydrate slurry dehydration treatment unit in the embodiment of the present invention. The dehydration treatment unit 5 includes 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, a second dehydration pipe Connector 22.

The mounting seat 14 is installed on the mounting frame 15, and the first connector 16, the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, the fourth dehydration pipe 20, The dehydration outer cylinder 21, the dehydration outer cylinder 21 is arranged outside the first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, and the fourth dehydration pipe 20, through the first connector 16 and the first slurry outer The row pipe 7 is connected. The first dehydration pipe 17, the second dehydration pipe 18, the third dehydration pipe 19, and the fourth dehydration pipe 20 are curved pipes with the same shape and size, and the wall surface is provided with some small holes, and the central angle is 20° ~45°. The bottom of the second connector 22 is provided with a round hole with the same diameter as the first dehydration pipe 17 , the second dehydration pipe 18 , the third dehydration pipe 19 and the fourth dehydration pipe 20 .

Fig. 5 is a bottom view of the dehydration treatment unit when the hydrate slurry does not flow out of the dehydration treatment unit in the embodiment of the present invention, and Fig. 6 is a bottom view of the dehydration treatment unit when the hydrate slurry flows out of the dehydration treatment unit in the embodiment of the present invention. As shown in Figure 5, the hydrate slurry is dehydrated in the dehydration treatment unit. During the rotation process of the dehydration treatment unit, the water in the slurry enters the dehydration outer cylinder 21 through centrifugation, and enters the liquid storage unit through the second liquid return pipe 11. 1. Hydrate particles move continuously in the first dehydration pipe 17 , the second dehydration pipe 18 , the third dehydration pipe 19 and the fourth dehydration pipe 20 . As shown in Figure 6, the hydrate slurry is automatically discharged into the slurry storage unit after being dehydrated. When the outlet position is aligned with the 6 o'clock position, the outlet position of the dehydration pipe is aligned with the round hole at the bottom of the second connector 22 , and the hydrate particles in the tube enter the slurry storage unit 6 through the second slurry outlet pipe 8 .

The hydrate slurry processing method comprises the following steps:

S1. Hydrate slurry dehydration treatment

S11. The water in the liquid storage unit 1 and the natural gas in the gas storage unit 2 undergo hydration reaction in the hydration reaction unit 3, and the generated hydrate slurry enters the rotating dehydration treatment unit 5 through gravity flow. According to the first dehydration pipe 17, the second Dehydration pipe 18, third dehydration pipe 19, fourth dehydration pipe 20 inlet pipeline bending degree and bending direction distribute the flow of hydrate slurry entering different dehydration pipes;

S12. The hydrate slurry is subjected to centrifugal dehydration under the rotation of the dehydration pipe. The water in the slurry enters the dehydration outer cylinder 21 and enters the liquid storage unit 1 through the second liquid return pipe 11. The hydrate particles are in the first dehydration pipe 17, the second Continuous movement in two dehydration pipes 18, the third dehydration pipe 19, and the fourth dehydration pipe 20;

S13. When the outlet positions of the four sets of dehydration pipes are staggered from the 6 o'clock position, the hydrate slurry is dehydrated in the dehydration pipes until the outlet position of a certain dehydration pipe is aligned with the 6 o'clock position, and the outlet position of the dehydration pipe is aligned with the 6 o'clock position. The second connector 22 has a round hole at the bottom, and the hydrate particles in the tube enter the slurry storage unit 6 through the second slurry discharge pipe 8;

S2. Storage and transportation of hydrate slurry

The hydrate slurry enters the slurry storage unit 6 for short-term storage. When the slurry transport tanker arrives there, connect the slurry storage unit 6 with the slurry transport tanker, open the valve of the pressurization pipe 13 of the slurry storage tank, and pressurize the natural gas to the slurry storage tank. Pressurization is carried out, and the hydrate slurry flows from the slurry storage tank into the slurry transport tanker.

Fig. 7 is a schematic structural view of a slurry transport tank car in an embodiment of the present invention, and Fig. 8 is a cross-sectional view of a slurry transport tank car in an embodiment of the present invention. The slurry transport tank car includes three parts: a car body, a thermal insulation outer tank 23 and a dehydration separation inner tank 27. The wall surface of the dehydration separation inner tank 27 is provided with a number of small holes, and is installed in the heat insulation outer tank 23. The heat insulation outer tank 23 is installed on the vehicle body. The slurry transport tanker receives the hydrate slurry from the slurry storage unit 6, transports it to the destination, connects the slurry transport tanker and the natural gas receiving pipeline, and injects hot water into the slurry transport tanker through the hot water filling pipe 26. The hydrate is decomposed into water and natural gas, the natural gas enters the natural gas receiving pipeline through the liquid inlet and exhaust multipurpose pipe, and the decomposed water is discharged through the residual liquid outlet pipe 24 .

The above description is a preferred embodiment of the present invention, and it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (6)

1. a kind of hydrate slurry processing device, it is characterised in that：Including dehydration unit (5), slurry storage unit (6), the outer comb (7) of the first slurries, the outer comb (8) of the second slurries, third slurries outer comb (9), the first liquid back pipe (10), second Liquid back pipe (11), natural gas recovery tube (12), serum storage tank pressure inlet (13)；

The dehydration unit (5) passes through the outer comb (7) of the first slurries, the second slurries outer comb (8), the second liquid back pipe (11) it is connect respectively with hydration reaction unit (3), slurry storage unit (6), liquid storage unit (1), the slurry storage unit (6) by the first liquid back pipe (10), natural gas recovery tube (12), serum storage tank pressure inlet (13) respectively with liquid storage unit (1), water Close reaction member (3), gas storage unit (2) connection.

2. hydrate slurry processing device according to claim 1, it is characterised in that：The dehydration unit It (5) include mounting base (14), mounting rack (15), the first connector (16), the first dehydrating tube (17), the second dehydrating tube (18), Three dehydrating tubes (19), the 4th dehydrating tube (20), dehydration outer cylinder (21), the second connector (22)；

The mounting base (14) is mounted on mounting rack (15), passes through the second connector (22) and the first connector (16), the One dehydrating tube (17), the second dehydrating tube (18), third dehydrating tube (19), the 4th dehydrating tube (20), dehydration outer cylinder (21) connection, institute The dehydration outer cylinder (21) stated is set to the first dehydrating tube (17), the second dehydrating tube (18), third dehydrating tube (19), the 4th dehydrating tube (20) external, it is connect by the first connector (16) with the outer comb (7) of the first slurries.

3. hydrate slurry processing device according to claim 2, it is characterised in that：First dehydrating tube (17), the second dehydrating tube (18), third dehydrating tube (19), the 4th dehydrating tube (20) are that shape, size are identical curved Pipe, central angle are 20 °~45 °.

4. hydrate slurry processing device according to claim 2, it is characterised in that：First dehydrating tube (17), the wall surface of the second dehydrating tube (18), third dehydrating tube (19), the 4th dehydrating tube (20) is equipped with several apertures.

5. hydrate slurry processing device according to claim 2, it is characterised in that：Second connector (22) bottom is equipped with a circular hole, size and the first dehydrating tube (17), the second dehydrating tube (18), third dehydrating tube (19), the 4th dehydrating tube (20) pipe diameter size is identical.

6. a kind of hydrate slurry processing and treating method, it is characterised in that：Include the following steps；

S1, hydrate slurry dehydration

The natural gas of S11, the water of liquid storage unit (1) and gas storage unit (2) carry out hydration reaction in hydration reaction unit (3), raw At hydrate slurry enter by gravity flow mode the dehydration unit (5) of rotation, according to the first dehydrating tube (17), second de- Water pipe (18), third dehydrating tube (19), the 4th dehydrating tube (20) suction line bending degree and bending direction distribution enter different The flow of hydrate slurry in dehydrating tube；

S12, hydrate slurry carry out centrifugal dehydration under the turning effort of dehydrating tube, and the water in slurries enters dehydration outer cylinder (21), enter liquid storage unit (1) through the second liquid back pipe (11), hydrate particle is in the first dehydrating tube (17), the second dehydrating tube (18), third dehydrating tube (19), constantly move in the 4th dehydrating tube (20)；

S13, when four groups of dehydrating tube outlet ports and 6 o'clock position are staggered, hydrate slurry carries out at dehydration in dehydrating tube Reason, when a certain dehydrating tube outlet port is directed at 6 o'clock position, which is directed at the second connector (22) bottom Portion's circular hole, hydrate particle enters slurry storage unit (6) through comb (8) outside the second slurries in the pipe；

S2, the storage transport of hydrate slurry

Hydrate slurry enters slurry storage unit (6) and carries out of short duration storage, after slurries transportation tank car reaches at this, by slurries Storage element (6) is connect with slurries transportation tank car, serum storage tank pressure inlet (13) valve is opened, by compressed natural gas to slurries Storage tank is pressurized, and hydrate slurry flows into slurries transportation tank car from serum storage tank.