CN217535932U - Low-temperature separator with small light hydrocarbon content for treating natural gas - Google Patents

Abstract

A low-temperature separator for processing natural gas with less light hydrocarbon liquid content, a shell is divided into a liquid phase space and a gas-liquid separation space, and the condition that the gas-liquid separation space is larger than the liquid phase space is met; the medium inlet is arranged on the shell at the adjacent position of the liquid phase space and the gas-liquid separation space, the medium inlet is provided with an inlet diffuser, a separation component is arranged in the gas-liquid separation space above the inlet diffuser, the separation component is a three-stage separation component, and a coalescence wire mesh, an NC-TP plate separation component and a plurality of multi-stage cyclone tubes are sequentially arranged in the fluid inlet direction; the coalescing screen and NC-TP plate separation modules are arranged linearly and vertically in the diameter and axial direction of the shell, and the space between the coalescing screen and the inner wall of the shell is a fluid inlet. The utility model discloses can get rid of the particle that 100% is greater than 5um in the natural gas, get rid of the liquid drop that 100% is greater than 5um in the natural gas to guarantee that the gas after the separation is under same operating pressure, the hydrocarbon dew point reduces 35 to 45 ℃.

Description

Low-temperature separator with small light hydrocarbon content for treating natural gas

Technical Field

The utility model relates to a process units of oil, petrochemical industry natural gas purification separation processing, in particular to natural gas purification low temperature separation processing technology equipment, specifically indicate a low temperature separator that handles natural gas and contain light hydrocarbon liquid measure fewly.

Background

The low-temperature separator is key equipment for controlling hydrocarbon and water dew points in a dehydration and dealkylation process of natural gas of an oil and gas field by a low-temperature method, and the separation efficiency of the low-temperature separator determines whether the hydrocarbon and water dew points of the natural gas of the oil and gas field are qualified or not, so that the quality and the energy consumption of downstream products are influenced. The types of cryogenic separators currently in common use are: wire mesh type separator, vane type separator, cyclone separator.

Chinese patent 202121140406.1 discloses a multiple separation type natural gas low temperature separator, natural gas in a container enters from an air inlet pipe of the container, enters from an air inlet at the lower end of an air lifting pipe, is discharged from an air outlet at the upper end of the air lifting pipe, is separated by a secondary wire mesh demister, is discharged through an air outlet pipe, and separated liquid is discharged from a liquid discharge pipe at the bottom of the container. However, the equipment is difficult to ensure the hydrocarbon dew point and the water dew point of the natural gas under certain pressure for a low-temperature separator with large amount of light hydrocarbon liquid for processing the natural gas.

Chinese patent 201821571993.8 discloses a packing type natural gas low-temperature separator, wherein after a medium passes through an inlet distributor, the medium sequentially passes through a packing layer, a mist catching screen and a blade structure, and then gas flows out from a natural gas outlet. However, the flow direction of the screen medium designed by the device is opposite to the drop settling direction, and the coalescence function of the screen is not fully utilized.

The existing low-temperature separator only changes the structural form of the internal parts of the separator, and no solution is provided for the specific function of the low-temperature separator.

SUMMERY OF THE UTILITY MODEL

The utility model provides a handle low temperature separator that natural gas contains light hydrocarbon liquid measure few, when handling the operating mode that natural gas liquid measure is few, can get rid of the solid particle that 100% is greater than 5um in the natural gas, get rid of the liquid drop that 100% is greater than 5um in the natural gas, and under the same operating pressure of low temperature separator, the hydrocarbon dew point reduces 35 to 45 ℃.

The utility model provides a technical scheme that its technical problem adopted is:

a low-temperature separator for treating natural gas with small light hydrocarbon liquid content comprises a shell, an upper end enclosure, a lower end enclosure, a gas outlet, a medium inlet and a separation assembly, wherein the upper end enclosure and the lower end enclosure are used for closing the shell, the gas outlet is arranged on the upper end enclosure, the medium inlet is arranged on the shell, and the separation assembly is arranged in the shell; the medium inlet is arranged on the shell at the adjacent position of the liquid phase space and the gas-liquid separation space, the medium inlet is provided with an inlet diffuser, a separation component is arranged in the gas-liquid separation space above the inlet diffuser, the separation component is a three-stage separation component, and a coalescence wire mesh, an NC-TP plate separation component and a plurality of multi-stage cyclone tubes are sequentially arranged in the fluid inlet direction; the coalescing screen and NC-TP plate separation modules are arranged linearly and vertically in the diameter and axial direction of the shell, and the space between the coalescing screen and the inner wall of the shell is a fluid inlet.

The coalescence screen and NC-TP plate separation component is sealed and supported by an upper partition plate arranged on the shell and a lower partition plate supporting the separation element; the lower clapboard of the supporting and separating element is a sector round plate, and a sector gap is a fluid inlet; a closed space formed by the NC-TP plate separation component, the upper partition plate and the lower partition plate of the supporting separation element is internally provided with a multi-stage cyclone tube; the upper part of the multi-stage cyclone tube is arranged on the upper clapboard, and the lower part of the multi-stage cyclone tube is arranged on the lower clapboard for supporting the multi-stage cyclone tube; the lower partition plate of the supporting multistage cyclone tube, the side partition plate connected in a right angle and the inner wall of the shell form a liquid collecting tank of the multistage cyclone tube, and a liquid discharge port is arranged on the shell which is flush with the lower partition plate of the supporting multistage cyclone tube; the lower clapboard of the supporting and separating element is provided with a downcomer, and the other end of the downcomer extends into the liquid phase space.

And a second liquid level meter or a liquid level transmitter is arranged in the liquid collection tank).

The distance between the NC-TP plate separation assembly and a side partition plate of the multi-stage cyclone tube in the horizontal direction is 200mm to 300mm.

The distance between the lower partition plate of the supporting and separating element and the lower partition plate of the supporting multistage cyclone tube in the vertical direction is 400mm to 600mm.

A liquid separation plate is arranged in the outflow direction of the NC-TP plate separation assembly, and the height is 250 to 350mm; and the distance between the liquid separation plate and the outlet of the NC-TP plate separation assembly is 100 to 150mm.

And differential pressure transmitters are arranged on the shells at the medium inlet and the gas outlet.

And the shell walls of the upper part and the lower part of the liquid phase space are respectively provided with a first liquid level meter/a liquid level transmitter.

A safety valve is provided on the housing in front of the separator assembly above the inlet diffuser.

The low-temperature separator is of a vertical structure and is supported by a skirt.

The utility model discloses because of multistage centrifugal separation has improved separation efficiency greatly, can realize the high-efficient separation of natural gas, can get rid of 100% in the natural gas and be greater than 5 um's particle moreover, get rid of 100% in the natural gas and be greater than 5 um's liquid drop. Meanwhile, the device has the advantages of simple structure, large treatment capacity, excellent performance, small volume and maintenance-free, and can realize automatic and continuous gas-liquid separation. The utility model discloses guarantee that the gas after the separation is under same operating pressure, the hydrocarbon dew point reduces 35 to 45 ℃. Has good effects of reducing the engineering investment and saving the operation cost.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 isbase:Sub>A schematic view taken along line A-A in FIG. 1;

FIG. 4 is a schematic view of an inlet diffuser configuration according to the present invention;

FIG. 5 is an assembly process diagram of the NC-TP plate separation assembly adopted by the structure of the utility model;

FIG. 6 is a schematic view of a multi-stage cyclone tube assembly according to the present invention;

reference numbers in the figures: the device comprises a shell 1, a medium inlet 2, a gas phase outlet 3, a liquid phase outlet 4, a liquid discharge port 6, a first liquid level meter/liquid level transmitter 7, a differential pressure transmitter 8, a manhole 9, a safety valve port 10, a coalescent silk screen 11, a 12NC-TP plate separation component, a multistage cyclone pipe 13, an upper partition 14, a side partition 15, a lower partition 16 supporting the multistage cyclone pipe, a lower partition 17 supporting a separation element, an inlet diffuser 18, a skirt 19, a second liquid level meter/liquid level transmitter 20, a downcomer 21, a liquid separation plate 22 and a discharge port 23.

Detailed Description

In order to further disclose the technical scheme of the invention, the following is combined with the attached drawings of the specification and is explained in detail through embodiments.

Referring to fig. 1, 2 and 3, a low-temperature separator for treating natural gas with small amount of liquid containing light hydrocarbon comprises a shell 1, an upper end enclosure, a lower end enclosure, a gas outlet 3, a medium inlet 2 and a separation assembly, wherein the upper end enclosure and the lower end enclosure are closed, the gas outlet is arranged on the upper end enclosure, the medium inlet is arranged on the shell, the separation assembly is arranged in the shell, the shell 1 is divided into a liquid phase space and a gas-liquid separation space, the condition that the gas-liquid separation space is larger than the liquid phase space is met, and the shell size of the low-temperature separator is designed and calculated according to the amount of gas in the medium. The cross-sectional area of the shell is equal to the gas flow area required for gas-liquid separation. The medium inlet 2 is tangentially arranged on the shell 1 at the adjacent position of the liquid phase space and the gas-liquid separation space, the inlet diffuser 18 is arranged at the position of the medium inlet 2, a separation component is arranged in the gas-liquid separation space above the inlet diffuser 18, the separation component is a three-stage separation component, and a coalescence wire mesh 11, an NC-TP plate separation component 12 and a plurality of multi-stage cyclone tubes 13 are sequentially arranged in the fluid inlet direction; the coalescing screen 11 and NC-TP plate separation modules 12 are arranged linearly and vertically in the diameter and axial direction of the housing, and the space between the coalescing screen 11 and the inner wall of the housing is the fluid inlet.

The NC-TP plate separation module 12 is a demister with liquid diversion and named as ZL202021311084.8, as shown in fig. 5.

The cyclone tube structure adopts a structure which is named as a multistage separation cyclone tube with the patent number of ZL2019110119164.8 and is used for the cyclone tube structure with high standard requirements of gas-liquid separation, and is shown in figure 6.

The inlet diffuser 18 is constructed as shown in fig. 4, and is assembled by connecting a steel plate having bolt holes at the medium inlet with the steel plate having bolt holes of the inlet diffuser by bolts and sealing with gaskets. The bottom of the inlet diffuser is supported by angle steel. This configuration is easy to install, removable, and facilitates replacement and maintenance of the inlet diffuser 18.

Referring to fig. 1 and 3, the coalescing screen 11 and NC-TP plate separator assembly 12 are enclosed and supported by an upper partition 14 removably enclosed in the housing and a lower partition 17 supporting the separation elements; the lower baffle 17 of the supporting separating element is a sector-shaped circular plate, and a sector-shaped gap (i.e. the space between the coalescing screen 11 and the inner wall of the shell) is a fluid inlet; a multi-stage cyclone tube 13 is arranged in a closed space formed by the NC-TP plate separation component 12, the upper partition plate 14 and the lower partition plate 17 of the supporting separation element; the upper part of the multi-stage cyclone tube 13 is arranged on an upper clapboard 14, and the lower part is arranged on a lower clapboard 16 for supporting the multi-stage cyclone tube; the lower clapboard 16 for supporting the multistage cyclone tube, the side clapboard 15 connected with the lower clapboard at right angle and the inner wall of the shell form a liquid collecting box of the multistage cyclone tube, and a liquid discharging port 6 is arranged on the shell which is flush with the lower clapboard 16 for supporting the multistage cyclone tube and is used for discharging liquid separated by the multistage cyclone tube.

After the medium flows into the diffuser 18, the gas and liquid are separated by a combination of gravity and buoyancy, and the liquid flows vertically downward and exits through the liquid phase outlet 4. The gas enters a separation component of an upper gas-liquid separation space and sequentially passes through a coalescence wire mesh 11, an NC-TP plate separation component 12 with a serpentine channel and a multi-stage cyclone pipe 13. The coalescence screen 11 coalesces the mist into small droplets, the gas with the small droplets passes through the NC-TP plate separation assembly 12 with the serpentine channel, the gas flow changes direction continuously, the small droplets collide with each other continuously, and coalesce on the surface of the NC-TP plate with the serpentine channel continuously to form larger droplets, and the larger droplets are collected at the bottom of the lower partition plate of the support separation element through diversion and are discharged through the downcomer 21. The gas after liquid removal flows out of the NC-TP plate separation component 12 and enters the multi-stage cyclone tubes 13 to carry out high-efficiency gas-liquid separation, the separated dry gas is discharged from the exhaust pipes of the cyclone tubes 13, the separated liquid falls on the lower partition plates 16 of the supporting multi-stage cyclone tubes and is discharged from the liquid discharge port 6 which is flush with the lower partition plates 16 of the supporting multi-stage cyclone tubes, and the rest liquid amount is gathered on the lower partition plates 17 of the supporting separation elements and flows into a liquid collection area through the downcomer 21.

And a second liquid level meter or a liquid level transmitter 20 is arranged in the liquid collection box, the liquid level of the separated liquid is displayed through the liquid level meter/the liquid level transmitter, and the liquid level transmitter transmits a liquid level signal to the central control room for centralized control, so that the liquid level can be automatically controlled within a set range.

The distance between the NC-TP board separation assembly 12 and a side partition board of the multi-stage cyclone tube 13 in the horizontal direction is 15 200mm to 300mm, and a buffer space of gas is ensured.

The distance between the lower partition plate 17 of the supporting and separating element and the lower partition plate 16 of the supporting multistage cyclone tube in the vertical direction is 400mm to 600mm, so that gas can uniformly enter the cyclone tube.

The liquid isolating plate 22 is arranged in the outflow direction of the NC-TP plate separation assembly, the height is about 250 to 350mm, and the purpose is to prevent liquid separated by the blades from excessively flowing into the cyclone tube cavity and influencing the separation efficiency of the high-efficiency cyclone tube. And the distance between the liquid separation plate 22 and the outlet of the NC-TP plate separation assembly 12 is 100 to 150mm, and liquid drops are buffered and separated.

Differential pressure transmitters 8 are arranged on the shells at the medium inlet 2 and the gas outlet 3 to ensure the separation performance of the demisting internal part and the multistage cyclone tube, and if the differential pressure is too large, the separation element needs to be cleaned.

And a first liquid level meter/liquid level transmitter 7 is arranged on the shell wall of the upper part and the lower part of the liquid phase space. The liquid level of the separated liquid is displayed by the liquid level meter/the liquid level transmitter, and the liquid level transmitter transmits a liquid level signal to the central control room for centralized control, so that the liquid level can be automatically controlled within a set range.

A safety valve 10 is provided in the housing in front of the separator assembly above the inlet diffuser 18 to provide overpressure protection.

The low-temperature separator is of a vertical structure and is supported by the skirt 19, so that the flowing space of gas in the height direction can be effectively enlarged, the flowing time of gas phase and liquid phase is prolonged, and the gas-liquid phase separation efficiency can be effectively improved.

The utility model discloses still include following structure: seal heads are welded at two ends of the shell 1, and a vent 23 is also arranged on the upper seal head. The lower part of the shell 1 is provided with a lower manhole 9, which is convenient for the installation and replacement of the inner parts. A liquid phase outlet 4 is arranged on the lower end socket of the shell 1.

Claims (10)

1. A low-temperature separator for processing natural gas with small light hydrocarbon liquid content comprises a shell, an upper end enclosure, a lower end enclosure, a gas outlet, a medium inlet and a separation assembly, wherein the upper end enclosure and the lower end enclosure are closed, the gas outlet is formed in the upper end enclosure, the medium inlet is formed in the shell, and the separation assembly is arranged in the shell; the medium inlet (2) is tangentially arranged on the shell (1) at the adjacent position of the liquid phase space and the gas-liquid separation space, an inlet diffuser (18) is arranged at the medium inlet (2), a separation component is arranged in the gas-liquid separation space above the inlet diffuser (18), the separation component is a three-stage separation component, and a coalescence wire mesh (11), an NC-TP plate separation component (12) and a plurality of multi-stage cyclone tubes (13) are sequentially arranged in the fluid inlet direction; the coalescence screen (11) and the NC-TP plate separation assembly (12) are arranged linearly and vertically in the diameter and axial direction of the shell, and the space between the coalescence screen (11) and the inner wall of the shell is a fluid inlet.

2. A cryogenic separator for processing natural gas with a low content of light hydrocarbons according to claim 1, wherein the coalescing screen (11) and NC-TP plate separation modules (12) are enclosed and supported by an upper partition (14) mounted on the housing and a lower partition (17) supporting the separation elements; the lower baffle plate (17) of the supporting and separating element is a sector circular plate, and a sector gap is a fluid inlet; a closed space formed by the NC-TP plate separation component (12), the upper partition plate (14) and the lower partition plate (17) of the supporting separation element is internally provided with a multi-stage cyclone tube (13); the upper part of the multi-stage cyclone tube (13) is arranged on an upper clapboard (14), and the lower part of the multi-stage cyclone tube is arranged on a lower clapboard (16) for supporting the multi-stage cyclone tube; the lower clapboard (16) for supporting the multistage cyclone tube, the side clapboard (15) which is connected at a right angle and the inner wall of the shell form a liquid collecting box of the multistage cyclone tube, and a liquid outlet (6) is arranged on the shell which is flush with the lower clapboard (16) for supporting the multistage cyclone tube; a down-flow pipe (21) is arranged on the lower clapboard (17) of the supporting and separating element, and the other end of the down-flow pipe (21) extends into the liquid phase space.

3. The cryogenic separator of claim 2 wherein a second level gauge or level transmitter (20) is provided in the header tank.

4. The low-temperature separator for treating the natural gas with the small amount of light hydrocarbon liquid as claimed in claim 2, wherein the distance between the NC-TP plate separation assembly (12) and a side partition plate (15) of the multistage cyclone tube (13) in the horizontal direction is 200mm to 300mm.

5. The cryogenic separator for treating the natural gas with the small amount of light hydrocarbon liquid as claimed in claim 2, wherein the distance between the lower supporting separation element partition (17) and the lower supporting multistage cyclone tube partition (16) in the vertical direction is 400mm to 600mm.

6. The low-temperature separator for processing natural gas with small amount of light hydrocarbon liquid according to claim 1, characterized in that a liquid separation plate (22) is arranged in the outflow direction of the NC-TP plate separation assembly (12), and the height is 250-350mm; and the distance between the liquid separation plate (22) and the outlet of the NC-TP plate separation component (12) is 100 to 150mm.

7. The cryogenic separator for treating natural gas with a small amount of light hydrocarbon liquid according to claim 1, wherein a differential pressure transmitter (8) is installed on the housing at the medium inlet (2) and the gas outlet (3).

8. The cryogenic separator for treating natural gas with a small amount of light hydrocarbons according to claim 1, wherein the housing walls of the upper and lower parts of the liquid phase space are provided with first level gauges/level transmitters (7).

9. The cryogenic separator for processing natural gas with a low amount of light hydrocarbons according to any of claims 1 to 8, wherein a safety valve (10) is provided in the housing before the separation module in the upper part of the inlet diffuser (18).

10. The cryogenic separator of claim 9, wherein the cryogenic separator is of a vertical configuration and is supported by a skirt (19).

Images