CN215113520U

CN215113520U - Preprocessing device for natural gas liquefaction

Info

Publication number: CN215113520U
Application number: CN202120949214.9U
Authority: CN
Inventors: 高雄; 李财; 赵晋国; 高扬
Original assignee: Shanxi Ningyang Energy Co ltd
Current assignee: Shanxi Ningyang Energy Co ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-12-10
Anticipated expiration: 2031-05-06

Abstract

The utility model discloses a pretreatment device for natural gas liquefaction, which comprises a treatment tank, wherein the inner cavity of the treatment tank is provided with a cooling chamber, deacidify room and dehydration room, the inner chamber of cooling chamber is provided with the coiled pipe, the below of cooling chamber is provided with the water storage box, the bottom of water storage box is provided with the condenser tube that is linked together with cooling chamber top right side, the top of water storage box is provided with the back flow that is linked together with cooling chamber bottom left side, be provided with the booster pump on the condenser tube, be provided with driving motor in the middle of the top of deacidify room, driving motor improves the axis of rotation and is provided with the stirring leaf, the top left side of deacidify room is provided with the feed inlet, the left end of treatment tank is provided with the intake pipe that meets with the coiled pipe, the right-hand member of treatment tank is provided with the outlet duct that meets with the top right side of dehydration room, the outside of deacidify room is provided with outer box, the inner chamber of outer box is provided with electric heater. The utility model discloses can carry out deacidification dehydration to the natural gas before the natural gas carries out liquefaction processing to protect subsequent piping installation.

Description

Preprocessing device for natural gas liquefaction

Technical Field

The utility model relates to a natural gas preliminary treatment technical field, in particular to preprocessing device for natural gas liquefaction.

Background

Natural gas requires pretreatment of the natural gas prior to its treatment as feed gas for liquefied natural gas. Because impurities such as moisture, carbon dioxide and hydrogen sulfide exist in natural gas and damage pipeline equipment, deacidification and dehydration are needed before natural gas liquefaction, otherwise, equipment aging is accelerated in the subsequent natural gas liquefaction process, and maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a preprocessing device for natural gas liquefaction, main aim at can carry out deacidification dehydration to the natural gas before the natural gas carries out liquefaction processing to protect subsequent piping installation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a pretreatment device for natural gas liquefaction comprises a treatment tank, wherein a cooling chamber, an acid removal chamber and a dehydration chamber are arranged in an inner cavity of the treatment tank, the cooling chamber, the acid removal chamber and the dehydration chamber are connected through a first pipeline and a second pipeline respectively, a coiled pipe is arranged in the inner cavity of the cooling chamber, a water storage tank is arranged below the cooling chamber, a cooling water pipe communicated with the right side of the top of the cooling chamber is arranged at the bottom of the water storage tank, a return pipe communicated with the left side of the bottom of the cooling chamber is arranged at the top of the water storage tank, a booster pump is arranged on the cooling water pipe, a driving motor is arranged in the middle of the top of the acid removal chamber, a rotating shaft extending into the inner cavity of the acid removal chamber is arranged at the bottom power output end of the driving motor, stirring blades are arranged on the outer wall of the rotating shaft, a feed inlet is arranged on the left side of the top of the acid removal chamber, and a first liquid outlet pipe is arranged at the bottom of the acid removal chamber, be provided with first valve on the first drain pipe, the bottom of valve is provided with the second drain pipe, be provided with the second valve on the second drain pipe, the left end of handling the jar is provided with the intake pipe that meets with the coiled pipe, the right-hand member of handling the jar is provided with the outlet duct that meets with the top right side of dehydration room, the outside of deacidification room is provided with outer box, the inner chamber of outer box is provided with electric heater.

Preferably, the cooling water pipe is a stainless steel pipe, and a cooling fan is arranged right above the cooling water pipe at the top of the inner cavity of the treatment tank.

Based on the technical characteristics, the water entering the cooling water pipe can realize the cooling effect of the cooling water through the stainless steel pipe with good heat conductivity under the action of the cooling fan.

Preferably, the inner cavity of the deacidification chamber is provided with alkali liquor, and one end of the first pipeline extending into the inner cavity of the deacidification chamber extends into the inside of the alkali liquor.

Based on the technical characteristics, after entering the deacidification chamber, the natural gas in the first pipeline can completely enter the alkali liquor, so that the acid gases such as carbon dioxide, hydrogen sulfide and the like in the gas are fully absorbed by the alkali liquor.

Preferably, the inner cavity of the dehydration chamber is provided with glycol solution dehydrated according to the glycol method.

Based on the technical characteristics, most of water in the natural gas can be removed, the water content of the natural gas is reduced, and the corrosion to equipment caused by overhigh water content is reduced.

Preferably, the inner cavity of the outer box is provided with heating oil heated by an oil bath.

Based on the technical characteristics, the oil in the outer box body is heated so as to heat the liquid in the deacidification chamber, and after the heating, acid gases such as carbon dioxide and the like combined by neutralization reaction are accelerated to be decomposed at high temperature and discharged through the gas outlet pipe, so that the utilization rate of alkali liquor is improved.

Preferably, the right side of the top of the deacidification chamber is provided with an exhaust pipe extending out of the top of the treatment tank, and the exhaust pipe is provided with an air valve.

Based on the above technical features, it is possible to discharge the decomposed acid gas with the gas valve opened.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model absorbs the acid gas in the natural gas by the alkali liquor in the deacidification chamber, and heats the alkali liquor which generates neutralization reaction and absorbs the acid gas by the oil bath heating mode, so that the temperature of the reaction product rises to accelerate the decomposition, and the oxide of carbon and sulfur is volatilized and discharged in a gas form, thereby improving the utilization rate of the alkali liquor and reducing the cost of separating the acid gas;

2. the utility model discloses owing to carry out the deacidification through neutralization reaction, and acid-base neutralization reaction can produce the heat, consequently cools down the natural gas in the cooling chamber, can reduce the temperature of taking off liquid in the acid room as far as possible, improves the absorptive capacity of alkali lye.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-treatment tank; 101-a cooling chamber; 102-a deacidification chamber; 103-a dehydration chamber; 2-a serpentine tube; 3-a water storage tank; 4-a cooling water pipe; 5-a return pipe; 6-a booster pump; 7-driving a motor; 8-a rotating shaft; 9-stirring blade; 10-a feed inlet; 11-a first liquid outlet pipe; 12-a first valve; 13-a first conduit; 14-a second conduit; 15-air inlet pipe; 16-an air outlet pipe; 17-an outer box; 18-an electric heater; 19-a second liquid outlet pipe; 20-a second valve; 21-a heat dissipation fan; 22-an exhaust pipe; 23-air valve.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in the attached drawing 1 of the specification, the utility model discloses a pretreatment device for natural gas liquefaction, which comprises a treatment tank 1, wherein the inner cavity of the treatment tank 1 is provided with a cooling chamber 101, a deacidification chamber 102 and a dehydration chamber 103, the cooling chamber 101, the deacidification chamber 102 and the dehydration chamber 103 are respectively connected through a first pipeline 13 and a second pipeline 14, the inner cavity of the cooling chamber 101 is provided with a coiled pipe 2, a water storage tank 3 is arranged below the cooling chamber 101, the bottom of the water storage tank 3 is provided with a cooling water pipe 4 communicated with the right side of the top of the cooling chamber 101, the top of the water storage tank 3 is provided with a return pipe 5 communicated with the left side of the bottom of the cooling chamber 101, a booster pump 6 is arranged on the cooling water pipe 4, a driving motor 7 is arranged in the middle of the top of the deacidification chamber 102, the bottom power output end of the driving motor 7 is provided with a rotating shaft 8 extending into the inner cavity of the deacidification chamber 102, the outer wall of the rotating shaft 8 is provided with a stirring blade 9, the left side of the top of the deacidification chamber 102 is provided with a feed inlet 10, the bottom of the deacidification chamber 102 is provided with a first liquid outlet pipe 11, a first valve 12 is arranged on the first liquid outlet pipe 11, a second liquid outlet pipe 19 is arranged at the bottom of the valve, a second valve 20 is arranged on the second liquid outlet pipe 19, an air inlet pipe 15 connected with the coiled pipe 2 is arranged at the left end of the treatment tank 1, an air outlet pipe 16 connected with the right side of the top of the dehydration chamber 103 is arranged at the right end of the treatment tank 1, an outer box 17 is arranged outside the deacidification chamber 102, and an electric heater 18 is arranged in an inner cavity of the outer box 17.

The cooling water pipe 4 adopts stainless steel pipe, and the inner chamber top of processing jar 1 is located cooling water pipe 4 and is provided with radiator fan 21 directly over, and the effect of cooling water cooling can be realized to the water that gets into in cooling water pipe 4 under radiator fan 21's effect by the stainless steel pipe that the heat conductivility is good.

The inner cavity of the deacidification chamber 102 is provided with alkali liquor, one end of the first pipeline 13 extending into the inner cavity of the deacidification chamber 102 extends into the alkali liquor, and natural gas in the first pipeline 13 can completely enter the alkali liquor after entering the deacidification chamber 102, so that acid gases such as carbon dioxide, hydrogen sulfide and the like in the gas are fully absorbed by the alkali liquor.

The inner cavity of the dehydration chamber 103 is provided with glycol solution dehydrated according to the glycol method, most of moisture in the natural gas can be removed, the water content of the natural gas is reduced, and the corrosion to equipment caused by overhigh water content is reduced.

The inner cavity of the outer box body 17 is provided with heating oil heated by oil bath, so that the oil in the outer box body 17 is heated to heat the liquid in the deacidification chamber 102, after heating, acid gases such as carbon dioxide combined by neutralization reaction are accelerated to be decomposed at high temperature and discharged through the gas outlet pipe 16, and the utilization rate of alkali liquor is improved.

An exhaust pipe 22 extending out of the top of the treatment tank 1 is provided on the right side of the top of the deacidification chamber 102, and a gas valve 23 is provided on the exhaust pipe 22, so that the decomposed acid gas can be discharged under the condition that the gas valve 23 is opened.

The utility model discloses in the use, the natural gas passes through intake pipe 15 and gets into in the coiled pipe 2 in the cooling chamber 101, cooling water in the 101 water storage tanks 3 of cooling chamber this moment is under booster pump 6's effect, water in the water storage tanks 3 gets into the top right side of cooling chamber 101 through condenser tube 4 back, after cooling the natural gas in the coiled pipe 2 in the cooling chamber 101, get into water storage tank 3 again by back flow 5, wherein the flow direction of the cooling water in the cooling chamber 101 is opposite with the flow direction of natural gas, thereby fully cool off the natural gas, and the water that gets into in condenser tube 4 is under radiator fan 21's effect, can realize the effect of cooling water cooling by the stainless steel pipe that the heat conductivility is good. After the natural gas is cooled, the natural gas in the first pipeline 13 enters the deacidification chamber 102 and then can completely enter alkali liquor, so that acid gases such as carbon dioxide, hydrogen sulfide and the like in the gas are fully absorbed by the alkali liquor, when the acid gases are absorbed, the driving motor 7 is started, the stirring blade 9 is driven to rotate through the rotating shaft 8, the alkali liquor is stirred and fully mixed with the gas, and the capacity of removing the acid gases is improved. After deacidifying, can be inevitable increase water content in the gas, get into dehydration chamber 103 through second pipeline 14 after, most moisture in the natural gas can be detached to the glycol solution in the dehydration chamber 103 inner chamber, reduces the water content of natural gas, reduces the water content and too high and cause the corruption to equipment, discharges the natural gas after the processing through outlet duct 16 at last.

During the process of treating the natural gas, the alkali liquor in the deacidification chamber 102 continuously absorbs the acid gas to generate neutralization reaction, the concentration of hydroxide ions is reduced, the capacity of absorbing the acid gas is reduced, at the moment, the oil in the outer box body 17 is heated through the electric heater 18 to heat the liquid in the deacidification chamber 102, after the heating, the acid gas such as carbon dioxide combined by the neutralization reaction is accelerated to be decomposed at high temperature and is discharged through the gas outlet pipe 16, and the utilization rate of the alkali liquor is improved.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pretreatment device for natural gas liquefaction, comprising a treatment tank (1), characterized in that: the inner cavity of the treatment tank (1) is provided with a cooling chamber (101), a deacidification chamber (102) and a dehydration chamber (103), the cooling chamber (101), the deacidification chamber (102) and the dehydration chamber (103) are connected through a first pipeline (13) and a second pipeline (14), the inner cavity of the cooling chamber (101) is provided with a coiled pipe (2), a water storage tank (3) is arranged below the cooling chamber (101), the bottom of the water storage tank (3) is provided with a cooling water pipe (4) communicated with the right side of the top of the cooling chamber (101), the top of the water storage tank (3) is provided with a return pipe (5) communicated with the left side of the bottom of the cooling chamber (101), the cooling water pipe (4) is provided with a booster pump (6), the middle of the top of the deacidification chamber (102) is provided with a driving motor (7), the bottom power output end of the driving motor (7) is provided with a rotating shaft (8) extending into the inner cavity of the deacidification chamber (102), the outer wall of axis of rotation (8) is provided with stirring leaf (9), the top left side of deacidification room (102) is provided with feed inlet (10), the bottom of deacidification room (102) is provided with first drain pipe (11), be provided with first valve (12) on first drain pipe (11), the bottom of valve is provided with second drain pipe (19), be provided with second valve (20) on second drain pipe (19), the left end of treatment tank (1) is provided with intake pipe (15) that meet with coiled pipe (2), the right-hand member of treatment tank (1) is provided with outlet duct (16) that meet with the top right side of dehydration room (103), the outside of deacidification room (102) is provided with outer container (17), the inner chamber of outer container (17) is provided with electric heater (18).

2. The pretreatment device for natural gas liquefaction according to claim 1, characterized in that: the cooling water pipe (4) adopts a stainless steel pipe, and a heat radiation fan (21) is arranged right above the cooling water pipe (4) at the top of an inner cavity of the treatment tank (1).

3. The pretreatment device for natural gas liquefaction according to claim 1, characterized in that: an alkali liquor is arranged in the inner cavity of the deacidification chamber (102), and one end of the first pipeline (13) extending into the inner cavity of the deacidification chamber (102) extends into the alkali liquor.

4. The pretreatment device for natural gas liquefaction according to claim 1, characterized in that: the inner cavity of the dehydration chamber (103) is provided with glycol solution dehydrated according to a glycol method.

5. The pretreatment device for natural gas liquefaction according to claim 1, characterized in that: the inner cavity of the outer box body (17) is provided with heating oil heated by adopting oil bath.

6. The pretreatment device for natural gas liquefaction according to claim 1, characterized in that: an exhaust pipe (22) extending out of the top of the treatment tank (1) is arranged on the right side of the top of the deacidification chamber (102), and an air valve (23) is arranged on the exhaust pipe (22).