CN217997088U - Gas injection and oil removal device for gas storage - Google Patents

Abstract

The utility model discloses a gas storage gas injection deoiling device, including the degreaser barrel, the degreaser barrel is vertical structure, and the inside of degreaser barrel is provided with elementary filtration separation element and secondary accurate coalescence unit, secondary accurate coalescence unit includes high pressure coalescence filter core and stay tube, and the stay tube is connected with the lower extreme of high pressure coalescence filter core, and the lower extreme of stay tube connects the baffle, and the baffle is fixed connection with the inner wall of degreaser barrel, be provided with the limiting plate on the stay tube lateral surface, the top of high pressure coalescence filter core is provided with the filter core gland, and degreaser barrel top is provided with quick-opening blind plate; the utility model discloses reduced the maintenance use cost of a whole set of gas storage gas injection device, increased substantially the deoiling effect under the original technological condition of change of minimality, can reduce lubricating oil content to below 4ppmw, solved current technology and risen and the drawback that the deoiling effect was discounted greatly along with natural gas temperature.

Description

Gas injection and oil removal device for gas storage

Technical Field

The utility model relates to a gas storage gas injection deoiling technical field specifically is a gas storage gas injection deoiling device.

Background

Under the situation that the dependence of natural gas import in China is continuously high, the reasonable natural gas storage layout is constructed, and the method has important practical significance for guaranteeing the energy safety of China and promoting the sustainable development of the economy of China. The underground gas storage is an artificial gas field or a gas reservoir formed by reinjecting natural gas produced from a gas field into an underground space capable of preserving the gas. The core flow of the gas storage is that purified gas is injected into the gas storage, the gas storage is filled into the underground gas storage after filtering, separating, pressurizing, cooling and metering the gas in the long-distance pipeline, the natural gas from the long-distance pipeline enters a gas injection compressor after impurities carried in the natural gas are filtered by a filter, the compressed natural gas enters a gas injection manifold after being cooled by a cooler after the compressor, and the compressed natural gas enters the gas injection well through a gas distribution valve group.

The existing centralized injection station in China mostly adopts a prying compressor, the gas injection pressure is generally 8-30MPa, the compressor generally adopts a multistage reciprocating compressor, and due to the characteristics of high working pressure, large pressure fluctuation, high working temperature and the like of the compressor, a large amount of lubricating oil is needed to lubricate and cool the compressor in the working process, along with the compression process, the lubricating oil can enter a gas injection manifold along with natural gas and further enter a gas injection well to cause the loss of a large amount of lubricating oil of the compressor, the lubricating oil of the compressor needs to be frequently added, the damage and major accidents of the high-pressure compressor can be caused in a short time, meanwhile, the problem of a lubricating oil pollution production layer can be caused, the problems of soft oil contamination and blockage of a shaft of the gas storage well and oil contamination and blockage of gas production equipment can be caused in the daily operation process of a plurality of gas storage pools, abnormal alcohol leakage can occur due to oil contamination and blockage, the normal safety production can be seriously influenced, and the maintenance cost of the gas production equipment can be greatly increased.

Through the on-the-spot tracking detection to a plurality of gas storage storehouses, statistical data shows that the natural gas oil content that gets into compressor low reaches is 10.1 to 17ppmw, according to literature and producer investigation, and it is less to stratum osmotic pressure and gas production influence when lubricating oil content is less than or equal to 4ppmw, to the ubiquitous lubricating oil problem that exceeds standard of present internal gas storage storehouse reciprocating compressor group pressure boost gas injection, need carry out high-efficient deoiling to gas injection compressor export natural gas, the utility model provides an among the gas storage storehouse gas injection process deoiling technology and deoiling device.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, a gas storage gas injection deoiling device is provided, this technology, low cost, the effect is showing, reduce a large amount of compressor lubricating oil losses by a wide margin and cause high-pressure compressor's damage and the risk of other major accidents, the maintenance use cost of a whole set of gas storage gas injection device has been reduced, increase substantially the deoiling effect under the original technological condition of change of minimality, can reduce lubricating oil content to below 4ppmw, solve current technology and rise and the drawback that the deoiling effect was discounted greatly along with natural gas temperature, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: the gas storage gas injection oil removal device comprises an oil remover barrel, wherein the oil remover barrel is of a vertical structure, a primary filtering and separating unit and a secondary precise coalescing unit are arranged inside the oil remover barrel, the secondary precise coalescing unit comprises a high-pressure coalescing filter element and a supporting tube, the supporting tube is connected with the lower end of the high-pressure coalescing filter element, a partition plate is connected with the lower end of the supporting tube, the partition plate is fixedly connected with the inner wall of the oil remover barrel, a limiting plate is arranged on the outer side surface of the supporting tube, a filter element pressing cover is arranged at the top of the high-pressure coalescing filter element, a quick-opening blind plate is arranged at the top of the oil remover barrel, an inlet, an outlet and an upper liquid discharge port are formed in the oil remover barrel, a safety valve port, an upper liquid level port, a pressure port and a lower liquid level port are formed in the oil remover barrel, and a sealing head is arranged at the bottom of the sealing head.

Further, an upper liquid level switch and a lower liquid level switch are respectively installed on the upper liquid level port and the lower liquid level port, the upper liquid level port and the lower liquid level port respectively correspond to an upper liquid accumulation cavity and a lower liquid accumulation cavity of the oil eliminator cylinder body, an upper liquid level transmitter and a lower liquid level transmitter are respectively installed on the oil eliminator cylinder body, an upper automatic liquid discharge valve is arranged on the upper liquid level port, a lower automatic liquid discharge valve and a lower liquid discharge stop valve are arranged on the lower liquid discharge port, and an upper liquid discharge stop valve is arranged on a pipeline connected with the upper automatic liquid discharge valve and the lower liquid discharge stop valve.

Further, a pressure difference transmitter is arranged on the side face of the oil remover barrel, a pressure transmitter is arranged at the top of the oil remover barrel, a safety valve assembly is arranged at the position of a safety valve opening in the oil remover barrel, and an outlet anti-pinch device is arranged at the position of an outlet of the oil remover barrel.

Furthermore, the primary filtering and separating unit has five filtering modes, namely horizontal blade type primary filtering, axial flow type primary filtering, tangential type primary filtering, volute double tangential type primary filtering and vertical blade type primary filtering.

Compared with the prior art, the beneficial effects of the utility model are that:

the vertical structure of the oil remover barrel ensures that the device has small occupied area and is convenient to be directly loaded in the existing gas injection system; when the liquid collected by the upper and lower liquid accumulation cavities of the oil remover barrel body reaches the set values of the upper liquid level switch and the lower liquid level switch or the upper liquid level transmitter and the lower liquid level transmitter, the upper automatic liquid discharge valve or the lower automatic liquid discharge valve is opened under the action of a master control signal to realize online liquid discharge; the pressure transmitter and the pressure difference transmitter can monitor the pressure in the equipment locally and remotely, and the pressure difference transmitter can monitor the pressure difference of the high-pressure coalescence filter element of the secondary precise coalescence unit in the equipment locally and remotely to remind the filter element to be replaced.

The process has the advantages of low cost and obvious effect, greatly reduces the risks of damage to a high-pressure compressor and other major accidents caused by the loss of a large amount of lubricating oil of the compressor, reduces the maintenance and use cost of the whole set of gas storage gas injection device, greatly improves the oil removal effect under the condition of changing the original process to the minimum extent, can reduce the content of the lubricating oil to be below 4ppmw, and solves the defect that the oil removal effect is greatly reduced along with the rise of the temperature and the pressure of natural gas in the conventional process.

Drawings

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

FIG. 2 is a simplified structure of the oil removing device of the present invention;

FIG. 3 is a gas injection and oil removal diagram of the present invention;

FIG. 4 is a schematic view of the connection between the gas injection oil removal system and the existing gas injection system;

FIG. 5 is a schematic view of the horizontal blade type primary filter structure of the present invention;

FIG. 6 is a schematic view of the axial flow primary filter of the present invention;

FIG. 7 is a schematic view of the tangential primary filtration structure of the present invention;

FIG. 8 is a schematic view of the dual tangential primary filtration structure of the volute of the present invention;

fig. 9 is a schematic view of the vertical blade type primary filter structure of the present invention;

fig. 10 is a schematic view of a secondary precision coalescing element according to the present invention.

In the figure: the device comprises a support 1, a heat preservation support ring 2, an inlet 3, an upper drainage outlet 4, an oil remover barrel 5, an outlet 6, an outlet 7, a belt clamping prevention device 8, a prewelded part 9, a quick-opening blind plate, a boom 10, a safety valve port 11, a secondary precise coalescence unit 12, an upper liquid level port 13, a pressure port 14, a primary filtration and separation unit 15, a lower liquid level port 16, a seal head 17, a lower drainage outlet vortex prevention device 18, a lower drainage outlet 19, a lower drainage stop valve 20, a lower automatic drainage valve 21, an upper liquid level transmitter 22, a ladder platform 23, a safety valve assembly 24, a pressure transmitter 25, a differential pressure transmitter 26, an upper liquid level switch 27, an upper automatic drainage valve 28, an upper drainage stop valve 29, a lower liquid level switch 30, a lower liquid level transmitter 31, a partition plate 32, a support pipe 33, a limiting plate 34, a high-pressure coalescence filter core 35, a filter core gland 36, a main system shutoff valve 37, an oil removal device inlet shutoff valve 38 and an oil removal device outlet shutoff valve 39.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-10, the present invention provides a technical solution: a gas storage gas injection and oil removal device comprises an oil remover cylinder body 5, wherein the oil remover cylinder body 5 is of a vertical structure, a primary filtering and separating unit 15 and a secondary precise coalescing unit 12 are arranged inside the oil remover cylinder body 5, the primary filtering and separating unit 15 is installed inside the oil remover cylinder body 5 through a fixing plate, the primary filtering and separating unit 15 has five filtering modes, namely horizontal blade type primary filtering, axial flow type primary filtering, tangential type primary filtering, volute double tangential type primary filtering and vertical blade type primary filtering, the secondary precise coalescing unit 12 comprises a high-pressure coalescing filter element 35 and a support tube 33, the support tube 33 is connected with the lower end of the high-pressure coalescing filter element 35, the lower end of the support tube 33 is connected with a partition plate 32, the partition plate 32 is fixedly connected with the inner wall of the oil remover cylinder body 5, and a limit plate 34 is arranged on the outer side face of the support tube 33, the top of the high-pressure coalescence filter element 35 is provided with a filter element gland 36, the top of the oil remover barrel 5 is provided with a quick-opening blind plate 9, the quick-opening blind plate 9 is provided with a suspension arm 10, the suspension arm 10 is convenient for the quick-opening blind plate 9 to rotate to one side after an upper cover is opened, so that the maintenance is convenient, the oil remover barrel 5 is provided with an inlet 3, an outlet 6 and an upper drainage outlet 4, the oil remover barrel 5 is provided with a safety valve port 11, an upper liquid level port 13, a pressure port 14 and a lower liquid level port 16, the lower end of the oil remover barrel 5 is provided with a seal head 17, the bottom of the seal head 17 is provided with a lower drainage outlet 19, the oil remover barrel 5 is provided with a pre-welded part 8, the pre-welded part 8 is connected with a ladder platform 23, and the ladder platform 23 is convenient for replacing the high-pressure coalescence filter element 35 of the secondary precision coalescence unit 12 and maintaining the oil removing device.

The upper liquid level port 13 and the lower liquid level port 16 are respectively provided with an upper liquid level switch 27 and a lower liquid level switch 30, the upper liquid level port 13 and the lower liquid level port 16 respectively correspond to upper and lower liquid accumulation cavities of the oil remover barrel 5, the oil remover barrel 5 is respectively provided with an upper liquid level transmitter 22 and a lower liquid level transmitter 31, the upper liquid level port 13 is provided with an upper automatic liquid discharge valve 28, the lower liquid discharge port 19 is provided with a lower automatic liquid discharge valve 21 and a lower liquid discharge stop valve 20, a pipeline connecting the upper automatic liquid discharge valve 28 and the lower liquid discharge stop valve 20 is provided with an upper liquid discharge stop valve 29, the upper liquid discharge stop valve 29 and the lower liquid discharge stop valve 20 are designed to solve the problem that when the upper automatic liquid discharge valve 28 or the lower automatic liquid discharge valve 21 fails, when liquid collected in the upper and lower liquid accumulation cavities of the oil remover barrel 5 reaches set values of the upper liquid level switch 27 and the lower liquid level switch 30 or the upper liquid discharge transmitter 22 and the lower liquid level transmitter 31, the upper automatic liquid discharge valve 28 or the lower automatic liquid discharge valve 21 is opened under the action of a master liquid discharge signal to realize online liquid discharge.

The upper liquid level switch 27 and the lower liquid level switch 30 can be in an air control signal type or an electric control signal type, the upper automatic drain valve 28 or the lower automatic drain valve 21 can be in an electric control type or an air control type, and the upper liquid level switch 27 and the lower liquid level switch 30 in the air control signal type and the upper automatic drain valve 28 or the lower automatic drain valve 21 in the air control type can easily realize automatic control liquid drainage without electric signals.

The side surface of the oil remover cylinder body 5 is provided with a differential pressure transmitter 26, the top of the oil remover cylinder body 5 is provided with a pressure transmitter 25, the pressure transmitter 25 and the differential pressure transmitter 26 can monitor the pressure in the equipment in situ and remotely, and the differential pressure transmitter 26 can monitor the differential pressure of the high-pressure coalescence filter element 35 of the secondary precise coalescence unit 12 in the equipment in situ and remotely so as to remind the filter element replacement; a safety valve component 24 is arranged at a safety valve port 11 on the degreaser cylinder 5, an outlet anti-pinch device 7 is arranged at an outlet 6 of the degreaser cylinder 5, and the anti-pinch device 7 is used for preventing liquid separated by the secondary precise coalescence unit 12 from being carried to a gas injection manifold by natural gas again; the vortex-preventing device 18 of the lower drainage outlet arranged on the lower drainage outlet 19 is used for preventing over drainage caused by vortex in the drainage process or error signals of the lower liquid level transmitter 31, the bottom of the oil remover barrel 5 is provided with a support 1 and a heat-insulating support ring 2, the heat-insulating support ring 2 is used for enabling the oil removing device to realize heat preservation or heat tracing heat preservation in cold regions, and the support 1 is used for enabling the oil remover barrel 5 to be fixed stably.

The existing gas storage gas injection processing unit mainly comprises a filter separator, a multistage compressor supercharger, a cooler and a metering unit, wherein a part of natural gas conveyed in a long-distance pipeline is collected from a pipe network in a light season, solid particle impurities and liquid impurities generated in the conveying process are removed through the filter separator in the gas injection processing unit, purified medium-pressure natural gas is pressurized to 15-30MPa grade gas injection pressure through a 2~3 stage by a compressor supercharging unit, then is cooled by the cooler to meet gas injection conditions, and is conveyed to each well mouth through a gas injection manifold after metering and is injected into an underground gas storage.

In the existing gas storage gas injection process, a large amount of compressor lubricating oil can be carried in natural gas after a compressor supercharger and a cooler, and meanwhile, after cooling, original saturated water in the natural gas can reach below a dew point and be condensed into liquid water, so that an oil-water mixture enters a gas well along with the natural gas, and a series of adverse effects are caused.

A gas injection and oil removal process for a gas storage comprises the following steps: closing the main system shutoff valve 37, opening the oil removal device inlet shutoff valve 38 and the oil removal device outlet shutoff valve 39, and allowing the liquid-containing natural gas passing through the cooler to enter the oil removal device through the oil removal device inlet shutoff valve 38; after entering the oil removal device, the natural gas firstly flows into the primary filtering and separating unit 15 through the inlet 3, removes solids and liquid with the particle size of more than 8 mu m under the action of centrifugal force and inertia, and then enters the high-pressure coalescence filter element 35 of the secondary precise coalescence unit 12; under the combined action of the coalescence layer and the separation layer of the high-pressure coalescence filter element 35, intercepted micro solid particles are left inside the high-pressure coalescence filter element 35, separated liquid is gathered outside the high-pressure coalescence filter element 35 and falls to the upper side of the partition plate 32 under the action of gravity along with the growth of liquid drops and is collected, purified clean natural gas is obtained and flows out of the oil removal device through the outlet anti-pinch device 7 and then flows into the gas injection manifold through the outlet 6, and therefore oil removal of the natural gas is achieved.

The process has the advantages of low cost and obvious effect, greatly reduces the risks of damage to a high-pressure compressor and other major accidents caused by the loss of a large amount of lubricating oil of the compressor, reduces the maintenance and use cost of the whole set of gas storage gas injection device, greatly improves the oil removal effect under the condition of changing the original process to the minimum extent, can reduce the content of the lubricating oil to be below 4ppmw, and solves the defect that the oil removal effect is greatly reduced along with the rise of the temperature and the pressure of natural gas in the conventional process.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a gas storage gas injection deoiling device, includes degreaser barrel (5), its characterized in that: the oil remover barrel (5) is of a vertical structure, a primary filtering and separating unit (15) and a secondary precise coalescing unit (12) are arranged inside the oil remover barrel (5), the secondary precise coalescing unit (12) comprises a high-pressure coalescing filter element (35) and a supporting tube (33), the supporting tube (33) is connected with the lower end of the high-pressure coalescing filter element (35), the lower end of the supporting tube (33) is connected with a partition plate (32), the partition plate (32) is fixedly connected with the inner wall of the oil remover barrel (5), a limiting plate (34) is arranged on the outer side surface of the supporting tube (33), a filter element gland (36) is arranged at the top of the high-pressure coalescing filter element (35), a quick-opening blind plate (9) is arranged at the top of the oil remover barrel (5), an inlet (3), an outlet (6) and an upper drainage outlet (4) are arranged on the oil remover barrel (5), a safety valve port (11), an upper liquid level outlet (13), a pressure port (14) and a lower liquid level outlet (16) are arranged on the oil remover barrel (5), a seal head (17) is arranged at the lower end of the oil remover barrel (5), and a liquid drainage port (19) is arranged at the bottom of the lower drainage port (17).

2. The gas storage injection and oil removal device of claim 1, wherein: the oil remover is characterized in that an upper liquid level switch (27) and a lower liquid level switch (30) are respectively installed on the upper liquid level port (13) and the lower liquid level port (16), the upper liquid level port (13) and the lower liquid level port (16) respectively correspond to an upper liquid collecting cavity and a lower liquid collecting cavity of the oil remover barrel body (5), an upper liquid level transmitter (22) and a lower liquid level transmitter (31) are respectively installed on the oil remover barrel body (5), an upper automatic liquid discharge valve (28) is arranged on the upper liquid level port (13), a lower automatic liquid discharge valve (21) and a lower liquid discharge stop valve (20) are arranged on the lower liquid discharge port (19), and an upper liquid discharge stop valve (29) is arranged on a pipeline connecting the upper automatic liquid discharge valve (28) and the lower liquid discharge stop valve (20).

3. The gas storage gas injection and oil removal device of claim 1, wherein: the pressure difference transmitter (26) is arranged on the side face of the oil remover barrel body (5), the pressure transmitter (25) is arranged at the top of the oil remover barrel body (5), the safety valve assembly (24) is arranged at the safety valve port (11) on the oil remover barrel body (5), and the outlet anti-pinch device (7) is arranged at the outlet (6) of the oil remover barrel body (5).

4. The gas storage injection and oil removal device of claim 1, wherein: the primary filtering and separating unit (15) has five filtering modes, namely horizontal blade type primary filtering, axial flow type primary filtering, tangential type primary filtering, volute double tangential type primary filtering and vertical blade type primary filtering.

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