Front-mounted high-pressure rear-mounted dehydration device for compressed natural gas

Abstract

The utility model relates to the technical field of natural gas production, in particular to a front-mounted high-pressure rear-mounted dehydration device for compressed natural gas, and aims to solve the technical problems that after a molecular sieve of a dehydration device absorbs water, long-time reduction dehydration is needed, dehydration operation cannot be carried out in the period, and the production time is wasted. Comprising a normal-pressure gas inlet pipe, a compressor, a multi-way valve, a high-pressure gas inlet pipe, a dehydration tank, a molecular sieve, a valve pipe, a high-pressure exhaust ring, a high-pressure exhaust pipe and a molecular sieve reduction mechanism, normal-pressure natural gas is compressed and injected into the dehydration tank through the compressor, the natural gas penetrates through the molecular sieve and is exhausted through the valve pipe, and dehydration is completed; the controller controls the multi-way valve to switch the gas transmission dehydration tank, close the valve pipe of the previous dehydration tank and open the valve pipe of the new dehydration tank, the dehydration operation is continued in this way, and the molecular sieve in the previous dehydration tank is controlled by the controller to be subjected to dehydration reduction by the molecular sieve reduction mechanism to wait for the next dehydration operation, so that continuous dehydration is realized, and the production time is not wasted.

Description

Technical Field

[0001] This utility model relates to the field of natural gas production technology, specifically to a pre-pressurized and post-dehydration device for compressed natural gas. Background Technology

[0002] With increasing global emphasis on environmental protection and energy diversification, compressed natural gas (CNG), as a clean and efficient alternative energy source, is finding increasingly widespread applications in transportation, industrial fuel, and residential use. Taking transportation as an example, CNG vehicles offer advantages such as low emissions and low operating costs, leading to their widespread adoption in urban public transport and taxis. To meet the diverse demands for CNG, a large number of CNG refueling stations and other infrastructure are needed. The pre-pressurized, post-dehydration unit is a key component of any CNG refueling station. If the natural gas contains moisture during compression, it can cause a series of problems. Under high pressure and low temperature conditions, moisture easily combines with hydrocarbons in the natural gas to form hydrates, clogging pipelines, valves, and equipment, thus affecting the normal production and transportation of compressed natural gas.

[0003] Current technology employs adsorption for dehydration. Its core component is the adsorption tower, which is filled with adsorbents such as molecular sieves and activated alumina. These adsorbents possess a large specific surface area and a unique crystal structure, exhibiting a strong affinity for water molecules. Under high pressure, natural gas enters the adsorption tower, where water vapor molecules are captured and fixed by the micropores on the adsorbent surface, thus achieving the separation of natural gas from water.

[0004] In existing dewatering devices, after the molecular sieve absorbs water, it requires a long time to revert and dewater. During this period, dewatering cannot be performed, which wastes production time. Utility Model Content

[0005] This invention addresses the technical problem that existing dehydration devices require a long reduction and dehydration time after the molecular sieve absorbs water, during which dehydration cannot be performed and production time is wasted. Therefore, it provides a pre-pressurized post-dehydration device for compressed natural gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pre-pressure post-pressure dehydration device for compressed natural gas, comprising: an atmospheric pressure inlet pipe connected to the compressor inlet, a compressor outlet connected to a multi-way valve, the multi-way valve being able to switch between one-on-one and multiple-closed states, the multi-way valve outlet being connected to the lower part of the dehydration tank via a high-pressure inlet pipe, the number of dehydration tanks corresponding to the number of control paths of the multi-way valve and evenly distributed around the compressor, a molecular sieve in the middle of the dehydration tank, the upper part of the dehydration tank being connected to a high-pressure exhaust ring via a valve pipe, the high-pressure exhaust ring being connected to a high-pressure exhaust pipe, each dehydration tank being connected to a molecular sieve reduction mechanism, the molecular sieve reduction mechanism being able to dehydrate the molecular sieve, and a controller controlling the opening and closing of the multi-way valve, the opening and closing of the solenoid valve in the valve pipe, and the dehydration of the designated molecular sieve by the molecular sieve reduction mechanism via a time relay.

[0007] Preferably, the multi-way valve includes a motor connected to the upper part of the valve housing. A cylindrical chamber is provided inside the valve housing. The cylindrical chamber is connected to the dehydration tank through a high-pressure air inlet pipe. A valve core is provided in the upper part of the cylindrical chamber. The diameter of the valve core is equal to the inner diameter of the cylindrical chamber. The circumferential surface of the valve core can block the air inlet of the high-pressure air inlet pipe. A notch is provided on the circumferential surface of the valve core. The lower part of the valve housing is connected to the air outlet of the compressor.

[0008] Preferably, the molecular sieve includes a slide rail connected to the middle of the dehydration tank, a sieve frame slidably and sealed inside the slide rail, the sieve frame has holes, the molecular sieve plate can be inserted into the sieve frame, and the sieve frame and the slide rail are fastened together by bolts.

[0009] Preferably, the molecular sieve reduction mechanism includes an atmospheric pressure inlet pipe II, which is connected to an air pump. The air pump can pump high-temperature reducing gas into the atmospheric pressure inlet pipe II. The atmospheric pressure inlet pipe II is connected to an inlet valve pipe through an atmospheric pressure inlet ring. Each dehydration tank is connected to a corresponding inlet valve pipe at the bottom and to a corresponding exhaust valve pipe at the top. The exhaust valve pipe is connected to an atmospheric pressure exhaust pipe through an atmospheric pressure exhaust ring. The controller controls the opening and closing of the inlet valve pipe and the exhaust valve pipe through a time relay.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The compressor compresses atmospheric natural gas and injects it into the dehydration tank. The natural gas passes through the molecular sieve and is discharged through the valve pipe, completing the dehydration. After the preset time is reached by the time relay, the controller controls the multi-way valve to switch the gas delivery dehydration tank, close the valve pipe of the previous dehydration tank, and open the valve pipe of the new dehydration tank. The dehydration operation continues in this way. Meanwhile, the molecular sieve in the previous dehydration tank is dehydrated and restored by the molecular sieve reduction mechanism controlled by the controller, so as to wait for the next dehydration operation. In this way, continuous dehydration is achieved without wasting production time.

[0012] Multiple dehydration tanks share the same compressor, high-pressure exhaust ring, and molecular sieve reduction mechanism, which greatly saves the cost of uninterrupted operation, and the circular layout reduces the footprint. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure One ;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention. Figure Two ;

[0015] Figure 3 This is a schematic diagram of the structure of the present invention. Figure Three ;

[0016] Figure 4 This is a schematic diagram of the structure of the present invention. Figure Four .

[0017] In the diagram: 1. Atmospheric pressure inlet pipe 1; 2. Compressor; 3. Multi-way valve; 31. Motor; 32. Valve housing; 33. Valve core; 34. Notch; 4. High pressure inlet pipe; 5. Dehydration tank; 6. Molecular sieve; 61. Slide rail; 62. Sieve frame; 7. Valve pipe; 8. High pressure exhaust ring; 9. High pressure exhaust pipe; 10. Molecular sieve reduction mechanism; 101. Atmospheric pressure inlet pipe 2; 102. Atmospheric pressure inlet ring; 103. Atmospheric pressure exhaust ring; 104. Atmospheric pressure exhaust pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to the connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] The following is in conjunction with the appendix Figures 1-4This embodiment describes a pre-high pressure post-dehydration device for compressed natural gas, comprising: an atmospheric pressure inlet pipe 1 connected to the inlet of compressor 2; an outlet of compressor 2 connected to a multi-way valve 3 capable of switching between open and closed states; an outlet of multi-way valve 3 connected to the lower part of dehydration tank 5 via a high pressure inlet pipe 4; the number of dehydration tanks 5 corresponding to the number of control paths of multi-way valve 3 and evenly distributed around compressor 2; a molecular sieve 6 located in the middle of dehydration tank 5; an upper part of dehydration tank 5 connected to a high pressure exhaust ring 8 via a valve pipe 7; a high pressure exhaust ring 8 connected to a high pressure exhaust pipe 9; and each dehydration tank 5 connected to a molecular sieve reduction mechanism 10 capable of dehydrating molecular sieve 6. A controller controls the opening and closing of multi-way valve 3, the opening and closing of solenoid valve in valve pipe 7, and the dehydration of designated molecular sieve 6 by molecular sieve reduction mechanism 10 via a time relay.

[0022] Atmospheric natural gas is injected into compressor 2 through atmospheric inlet pipe 1. Compressed by compressor 2, the atmospheric natural gas is compressed under the control of multi-way valve 3 and enters the designated dehydration tank 5 through high-pressure inlet pipe 4. The natural gas passes through molecular sieve 6 in the middle of dehydration tank 5 from bottom to top, and is discharged through valve pipe 7 to high-pressure exhaust ring 8, and then discharged through high-pressure exhaust pipe 9, completing the dehydration. After the preset time of time relay, the molecular sieve 6 is full of water. The controller controls multi-way valve 3 to switch the gas delivery dehydration tank 5, close the valve pipe 7 of the previous dehydration tank 5, and open the valve pipe 7 of the new dehydration tank 5, so as to continue the dehydration operation. Meanwhile, the molecular sieve 6 in the previous dehydration tank is dehydrated and reduced by the molecular sieve reduction mechanism 10 controlled by the controller, so as to wait for the next dehydration operation. In this way, continuous dehydration is achieved without wasting production time. Multiple dehydration tanks 5 share the same compressor 2, high-pressure exhaust ring 8 and molecular sieve reduction mechanism 10, which greatly saves the cost of uninterrupted operation. The circular layout reduces the footprint.

[0023] The multi-way valve 3 includes a motor 31, which is connected to the upper part of the valve housing 32. The valve housing 32 has a cylindrical chamber inside, which is connected to the dehydration tank 5 through a high-pressure air inlet pipe 4. A valve core 33 is provided in the upper part of the cylindrical chamber. The diameter of the valve core 33 is equal to the inner diameter of the cylindrical chamber. The circumferential surface of the valve core 33 can block the air inlet of the high-pressure air inlet pipe 4. A notch 34 is provided on the circumferential surface of the valve core 33. The lower part of the valve housing 32 is connected to the air outlet of the compressor 2.

[0024] When the multi-way valve 3 is switched, the control motor 31 rotates at a specified angle. The output shaft of the motor 31 drives the valve core 33 to rotate. The valve core 33 drives the notch 34 to rotate to the new high-pressure air inlet pipe 4, thus blocking the high-pressure air inlet pipe 4. The high-pressure gas is then discharged through the notch at the bottom of the valve body 32, completing the switching.

[0025] The molecular sieve 6 includes a slide rail 61, which is connected to the middle of the dehydration tank 5. A sieve frame 62 is slidably and sealed inside the slide rail 61. The sieve frame 62 has holes, and the molecular sieve plate can be inserted into the sieve frame 62. The sieve frame 62 and the slide rail 61 are fastened together by bolts.

[0026] The sieve frame 62 and the slide rail 61 are fastened with bolts and are tightly sealed by the sealing gasket at the junction. When replacing the molecular sieve plate, the sieve frame 62 can be removed and the old molecular sieve plate inside the sieve frame 62 can be pulled out to complete the replacement, which is very convenient.

[0027] The molecular sieve reduction mechanism 10 includes an atmospheric pressure inlet pipe 2 101, which is connected to an air pump. The air pump can pump high-temperature reducing gas into the atmospheric pressure inlet pipe 2 101. The atmospheric pressure inlet pipe 2 101 is connected to the inlet valve pipe through an atmospheric pressure inlet ring 102. Each dehydration tank 5 has a corresponding inlet valve pipe connected to its lower part and a corresponding exhaust valve pipe connected to its upper part. The exhaust valve pipe is connected to the atmospheric pressure exhaust pipe 104 through an atmospheric pressure exhaust ring 103. The controller controls the opening and closing of the inlet valve pipe and the exhaust valve pipe through a time relay.

[0028] Atmospheric pressure high-temperature reducing gas enters atmospheric pressure intake ring 102 through atmospheric pressure intake pipe 2 101. The controller opens the intake valve pipe and exhaust valve pipe of the dehydration tank 5 to be dehydrated. The gas enters the dehydration tank 5 from the bottom and passes through molecular sieve 6 for reduction and dehydration. The gas is discharged through exhaust valve pipe and enters atmospheric pressure exhaust ring 103 and atmospheric pressure exhaust pipe 104 to be discharged, completing the exhaust.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-high pressure post-dehydration device for compressed natural gas, comprising: The atmospheric pressure inlet pipe one (1) is connected with the compressor (2) inlet end, the compressor (2) outlet end is connected with the multi-way valve (3), the multi-way valve (3) can switch one-way multi-closed state, Its characterized in that: the multi-way valve (3) outlet end is connected with the dehydration tank (5) lower part through the high pressure inlet pipe (4), the dehydration tank (5) number corresponds with the multi-way valve (3) control road and is distributed around the compressor (2), the dehydration tank (5) middle part is equipped with the molecular sieve (6), the dehydration tank (5) upper part is connected with the high pressure exhaust ring (8) through the valve pipe (7), the high pressure exhaust ring (8) is connected with the high pressure exhaust pipe (9), each dehydration tank (5) is connected with the molecular sieve reduction mechanism (10), the molecular sieve reduction mechanism (10) can carry out dehydration to the molecular sieve (6), the controller controls the multi-way valve (3) on-off, the electromagnetic valve on-off in the valve pipe (7) and the molecular sieve reduction mechanism (10) dehydration to the specified molecular sieve (6) through time relay.

2. The CNG pre-high pressure post-dehydration device according to claim 1, characterized in that: The multi-way valve (3) includes motor (31), motor (31) is connected to the valve housing (32) upper part, the valve housing (32) inside is provided with cylindrical chamber, cylindrical chamber is connected with the dehydration tank (5) through the high pressure inlet pipe (4), the upper part in the cylindrical chamber is equipped with the valve core (33), the valve core (33) diameter is equal to the cylindrical chamber inner diameter, the valve core (33) circumferential surface can block the high pressure inlet pipe (4) gas inlet, the valve core (33) circumferential surface is equipped with notch (34), the valve housing (32) lower part is connected with the compressor (2) outlet end.

3. The CNG pre-high pressure post dehydration device according to claim 1, characterized in that: The molecular sieve (6) includes slide rail (61), slide rail (61) is connected to the dehydration tank (5) middle part, the slide rail (61) is slidably connected with the sieve frame (62) in the seal, the sieve frame (62) is equipped with hole, the molecular sieve plate can be inserted into the sieve frame (62) inside, the sieve frame (62) is fastened with the slide rail (61) through bolt.

4. The CNG pre-high pressure post-dehydration device according to claim 1, characterized in that: The molecular sieve reduction mechanism (10) includes atmospheric pressure inlet pipe two (101), atmospheric pressure inlet pipe two (101) is connected with the air pump, the air pump can pump high temperature reducing gas into atmospheric pressure inlet pipe two (101), atmospheric pressure inlet pipe two (101) is connected with the inlet valve pipe through atmospheric pressure inlet ring (102), each dehydration tank (5) lower part is connected with corresponding inlet valve pipe, each dehydration tank (5) upper part is connected with corresponding exhaust valve pipe, the exhaust valve pipe is connected with the atmospheric pressure exhaust pipe (104) through the atmospheric pressure exhaust ring (103), the controller controls the inlet valve pipe and exhaust valve pipe on-off through time relay.

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