A dehydration device for liquefied natural gas purification

Abstract

This utility model relates to the field of natural gas purification technology, and proposes a dehydration device for liquefied natural gas purification, comprising: a first dehydration component; a gas connecting pipe is provided at the top of the first dehydration component, and a heat exchange component is provided at the other end of the gas connecting pipe for reducing the gas temperature; a secondary dehydration component is provided at the top of the heat exchange component for secondary dehydration. Glycol is sprayed through a spray pipe onto the packing material to increase its surface area. Natural gas sprayed through the gas output pipe then contacts the glycol on the packing material, and the glycol's hygroscopic properties quickly adsorb the moisture from the natural gas, achieving dehydration. Afterwards, the gas undergoes secondary dehydration through the secondary dehydration component, and finally enters a molecular sieve adsorption tower for final dehydration. This reduces the burden on the molecular sieve adsorption tower and improves dehydration efficiency. Natural gas dehydration can be achieved without heating, increasing the safety of the equipment.

Description

Technical Field

[0001] This utility model belongs to the field of natural gas purification technology, specifically relating to a dehydration device for liquefied natural gas purification. Background Technology

[0002] Liquefied natural gas (LNG) is a liquid form of natural gas produced by cooling it to extremely low temperatures, significantly reducing its volume and facilitating long-distance transportation and storage. Its main component is methane, and its combustion emissions are significantly lower than those of traditional fossil fuels, making it a relatively clean energy option. It is widely used in power generation, industrial fuel, urban power supply, and marine propulsion, playing a crucial transitional role in the energy transition. With the growing demand for green energy, LNG is gradually replacing high-polluting fuels and forming a complementary system with renewable energy sources.

[0003] A known authorized patent with application number 202222610839.X discloses a dehydration device for liquefied natural gas purification, comprising: a base, a pretreatment mechanism, a dehydration mechanism, and a storage mechanism. The base has a stepped cross-section, with its height gradually decreasing from left to right. The pretreatment mechanism includes a pretreatment box, pre-filter plates, and a gas channel. The pretreatment box is located on the right side of the upper end face of the base. Two pre-filter plates are evenly spaced on the upper and lower sides inside the pretreatment box, and a gas channel is provided on the outer left surface of the pretreatment box. This dehydration device for liquefied natural gas purification allows the gas to be pretreated by the pretreatment mechanism, preventing larger impurities from entering the dehydration mechanism along with the gas. Furthermore, when not in use, the user can clean and maintain the interior of the pretreatment mechanism, meeting the user's needs.

[0004] However, the following problems were found in the implementation of the relevant technology: the device uses heating to dehydrate, but the degree of dehydration by heating is low, and there is still a high amount of moisture after dehydration. In addition, heating will cause excessive pressure, which will increase the probability of accidents during operation.

[0005] Therefore, a dehydration device for liquefied natural gas purification is proposed to solve the above problems. Utility Model Content

[0006] This utility model proposes a dehydration device for liquefied natural gas purification, which solves the problems in related technologies where the device uses heating for dehydration, but the dehydration degree is low, and there is still a high moisture content after dehydration. In addition, heating can lead to excessive pressure, increasing the probability of accidents during operation.

[0007] The technical solution of this utility model is as follows: A dehydration device for liquefied natural gas purification, comprising: First water removal component; The first water removal component is provided with a gas communication pipe at its top end, and a heat exchange component is provided at the other end of the gas communication pipe to reduce the gas temperature. The top of the heat exchange component is provided with a secondary water removal component for secondary water removal; An expansion valve is provided at the input end of the secondary dewatering component; The heat exchange component is provided with an output manifold at its output end, and a molecular sieve adsorption tower is provided at the output end of the output manifold. A regenerator is provided at the input end of the first water removal component.

[0008] Preferably, the first water removal component includes an absorption tank and packing material disposed inside the absorption tank. A spray pipe is disposed inside the absorption tank. An output hole is opened on the lower surface of the spray pipe. A connecting pipe is disposed at the input end of the spray pipe. The other end of the connecting pipe is connected to the output end of the regenerator. The spray pipe is located above the filler.

[0009] Preferably, the first water removal component further includes a gas output pipe disposed inside the absorption tank, the upper surface of the gas output pipe is provided with a gas outlet hole, the gas output pipe is located below the packing material, and the input end of the gas output pipe is provided with a natural gas input pipe; The bottom of the absorption tank is provided with a collection bottom.

[0010] Preferably, a pressure stabilizing bottle is provided at the bottom of the collecting base, and a recovery pipe is provided at the bottom end of the pressure stabilizing bottle, which is connected to the input end of the regenerator.

[0011] Preferably, the heat exchange assembly includes a cooling chamber and a cooling coil disposed inside the cooling chamber, and the output end of the gas connecting pipe is disposed at the bottom end of the cooling chamber. The input end of the output manifold is connected to the output end of the cooling coil.

[0012] Preferably, the secondary dewatering assembly includes an adhesion tank and a secondary output pipe and a secondary input pipe disposed at both ends of the upper side of the adhesion tank. The input end of the secondary input pipe is disposed at the top of the cooling chamber, and the output end of the secondary output pipe is connected to the input end of the cooling coil. The expansion valve is located on the outer wall of the secondary input pipe. A collection bottle is provided at the bottom of the adhesion tank.

[0013] Preferably, the secondary dewatering assembly further includes a support shaft rotatably disposed inside the adhesion tank, the outer wall of the support shaft being provided with multiple rotating blades, and a drive motor being fixedly connected to the outer wall of the adhesion tank, the output end of the drive motor being fixedly connected to the support shaft.

[0014] Preferably, the output end of the molecular sieve adsorption tower is provided with a connection port.

[0015] The working principle and beneficial effects of this utility model are as follows: 1. Glycol is sprayed onto the packing material through a spray pipe, increasing its surface area. Natural gas then sprayed through the gas output pipe comes into contact with the glycol on the packing material. The glycol's hygroscopic properties quickly adsorb the moisture from the natural gas, achieving dehydration. Afterward, it undergoes secondary dehydration through a secondary dehydration component, and finally enters the molecular sieve adsorption tower for final dehydration. This reduces the burden on the molecular sieve adsorption tower and improves dehydration efficiency. Natural gas dehydration can be achieved without heating, increasing the safety of the equipment.

[0016] 2. By setting up cooling components and secondary dehydration components, the gas after being dehydrated by the first dehydration component enters the interior of the cooling chamber. Then, it undergoes rapid pressure reduction and expansion through the expansion valve, causing the temperature to drop rapidly. After being dehydrated by the secondary dehydration component, the even cooler natural gas enters the cooling coil to pre-cool the gas inside the cooling chamber, allowing the equipment to cool down without the need for external equipment. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional three-dimensional structural diagram of the heat exchange component of this utility model; Figure 3 This is a cross-sectional three-dimensional structural diagram of the secondary water removal component of this utility model; Figure 4 This is a cross-sectional three-dimensional structural diagram of the water removal component of this utility model.

[0019] In the diagram: 1. First dehydration assembly; 101. Spray pipe; 102. Output port; 103. Packing material; 104. Gas output pipe; 105. Gas outlet; 106. Absorption tank; 107. Collection bottom; 2. Heat exchange assembly; 201. Cooling chamber; 202. Cooling coil; 3. Secondary dehydration assembly; 301. Secondary output pipe; 302. Secondary input pipe; 303. Rotating blade; 304. Drive motor; 305. Collection bottle; 306. Support shaft; 307. Adhesion tank; 4. Molecular sieve adsorption tower; 5. Regenerator; 6. Connecting pipe; 7. Recovery pipe; 8. Pressure stabilizing bottle; 9. Gas connecting pipe; 10. Output main pipe; 11. Connection port; 12. Expansion valve; 13. Natural gas input pipe. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0021] Implementation Please see Figure 1 -4. A dehydration device for liquefied natural gas purification, comprising: First water removal component 1; The top end of the first dewatering component 1 is provided with a gas connecting pipe 9, and the other end of the gas connecting pipe 9 is provided with a heat exchange component 2 for reducing the gas temperature. A secondary water removal component 3 is provided at the top of the heat exchange component 2 for secondary water removal; An expansion valve 12 is installed at the input end of the secondary water removal component 3; The output end of the heat exchange component 2 is provided with an output manifold 10, and the output end of the output manifold 10 is provided with a molecular sieve adsorption tower 4. The input end of the first water removal component 1 is equipped with a regenerator 5; The first dewatering component 1 includes an absorption tank 106 and a packing material 103 disposed inside the absorption tank 106. A spray pipe 101 is disposed inside the absorption tank 106. An output hole 102 is opened on the lower surface of the spray pipe 101. A connecting pipe 6 is disposed at the input end of the spray pipe 101. The other end of the connecting pipe 6 is connected to the output end of the regenerator 5. The spray pipe 101 is located above the filler 103; The first water removal assembly 1 also includes a gas output pipe 104 disposed inside the absorption tank 106. The upper surface of the gas output pipe 104 is provided with a gas outlet 105. The gas output pipe 104 is located below the packing 103. The input end of the gas output pipe 104 is provided with a natural gas input pipe 13. A collection bottom 107 is provided at the bottom of the inner part of the absorption tank 106; A pressure stabilizing bottle 8 is provided at the bottom of the collecting base 107, and a recycling pipe 7 is provided at the bottom end of the pressure stabilizing bottle 8. The recycling pipe 7 is connected to the input end of the regenerator 5. The heat exchange assembly 2 includes a cooling chamber 201 and a cooling coil 202 disposed inside the cooling chamber 201, and the output end of the gas connecting pipe 9 is disposed at the bottom end of the cooling chamber 201. The input terminal of the output manifold 10 is connected to the output terminal of the cooling coil 202; The secondary dewatering assembly 3 includes an adhesion tank 307 and a secondary output pipe 301 and a secondary input pipe 302 disposed at both ends of the upper side of the adhesion tank 307. The input end of the secondary input pipe 302 is disposed at the top of the cooling chamber 201. The output end of the secondary output pipe 301 is connected to the input end of the cooling coil 202. The expansion valve 12 is located on the outer wall of the secondary input pipe 302. A collection bottle 305 is provided at the bottom of the adhesion can 307; The secondary dewatering assembly 3 also includes a support shaft 306 rotatably disposed inside the adhesion tank 307. Multiple rotating blades 303 are provided on the outer wall of the support shaft 306. A drive motor 304 is fixedly connected to the outer wall of the adhesion tank 307. The output end of the drive motor 304 is fixedly connected to the support shaft 306. The output end of the molecular sieve adsorption tower 4 is equipped with a connection port 11.

[0022] The technical solution provided in this embodiment is as follows: In use, the natural gas input device is first connected to the natural gas input pipe 13, and when the regenerator 5 is started, glycol is output. Glycol enters the interior of the spray pipe 101 through the connecting pipe 6, and then enters the interior of the absorption tank 106 through the output hole 102, spraying onto the surface of the packing 103, forming a liquid film on the surface of the packing 103 and increasing its surface area. Natural gas then enters the interior of the gas output pipe 104 through the natural gas input pipe 13, and is output upwards through the gas outlet 105, contacting the packing 103 and the glycol on its surface. Dehydration occurs through the glycol, and the glycol rises to the top of the absorption tank 106, outputting through the gas connecting pipe 9. The glycol, after water absorption, drips to the collection bottom 107 and then enters the interior of the pressure stabilizing bottle 8. Next, it enters the interior of the regenerator 5 through the recovery pipe 7 to regenerate the glycol. After regeneration, it re-enters the interior of the spray pipe 101. The natural gas output through the gas connecting pipe 9 enters the interior of the cooling chamber 201, and then undergoes cooling... After passing through the heating coil 202, the gas enters the secondary input pipe 302. It undergoes pressure reduction and expansion via the expansion valve 12 installed in the secondary input pipe 302, cooling the gas. Any remaining small amount of water vapor in the gas condenses into liquid water, and the heavy hydrocarbons in the gas also condense into liquid. The gas then enters the secondary dehydration assembly 3. Next, the drive motor 304 is activated. The rotation of the drive motor 304 drives the support shaft 306 to rotate, which in turn drives the rotating blade 303 to rotate. The high-speed rotation of the rotating blade 303 causes the gas to rotate, thus... The centrifugal force generated by the rotation, and the liquid coming into contact with the rotating blade 303, throws the liquid against the inner wall of the adhesion tank 307 and into the collection bottle 305 for temporary storage. The gas is output through the secondary output pipe 301 to the interior of the cooling coil 202 and then output through the main output pipe 10. When the gas is inside the cooling coil 202, it cools the gas input into the cooling chamber 201 through the gas connecting pipe 9. The main output pipe 10 transports the gas to the molecular sieve adsorption tower 4 for final water removal and outputs it through the connection port 11. The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A dehydration device for purifying liquefied natural gas, characterized by comprising: include: First water removal component (1); The first water removal component (1) is provided with a gas connecting pipe (9) at its top end, and a heat exchange component (2) is provided at the other end of the gas connecting pipe (9) to reduce the gas temperature; The top of the heat exchange component (2) is provided with a secondary water removal component (3) for secondary water removal; An expansion valve (12) is provided at the input end of the secondary dewatering component (3). The heat exchange component (2) is provided with an output manifold (10) at its output end, and a molecular sieve adsorption tower (4) is provided at the output end of the output manifold (10). The input end of the first water removal component (1) is provided with a regenerator (5).

2. The dehydration device for purifying liquefied natural gas according to claim 1, characterized by: The first water removal component (1) includes an absorption tank (106) and a packing material (103) disposed inside the absorption tank (106). A spray pipe (101) is disposed inside the absorption tank (106). An output hole (102) is opened on the lower surface of the spray pipe (101). A connecting pipe (6) is disposed at the input end of the spray pipe (101). The other end of the connecting pipe (6) is connected to the output end of the regenerator (5). The spray pipe (101) is located above the filler (103).

3. A dehydration device for purifying liquefied natural gas according to claim 2, characterized by: The first water removal component (1) also includes a gas output pipe (104) disposed inside the absorption tank (106). The upper surface of the gas output pipe (104) is provided with a gas outlet (105). The gas output pipe (104) is located below the packing (103). The input end of the gas output pipe (104) is provided with a natural gas input pipe (13). The bottom of the absorption tank (106) is provided with a collection bottom (107).

4. The dehydration device for purifying liquefied natural gas according to claim 3, characterized by: The bottom of the collecting base (107) is provided with a pressure stabilizing bottle (8), and the bottom end of the pressure stabilizing bottle (8) is provided with a recycling pipe (7), which is connected to the input end of the regenerator (5).

5. The dehydration device for purifying liquefied natural gas according to claim 1, characterized by: The heat exchange component (2) includes a cooling chamber (201) and a cooling coil (202) disposed inside the cooling chamber (201), and the output end of the gas connecting pipe (9) is disposed at the bottom end of the cooling chamber (201); The input end of the output manifold (10) is connected to the output end of the cooling coil (202).

6. A dehydration device for purifying liquefied natural gas according to claim 5, characterized by: The secondary dewatering assembly (3) includes an adhesion tank (307) and a secondary output pipe (301) and a secondary input pipe (302) disposed at both ends of the upper side of the adhesion tank (307). The input end of the secondary input pipe (302) is disposed at the top of the cooling chamber (201). The output end of the secondary output pipe (301) is connected to the input end of the cooling coil (202). The expansion valve (12) is located on the outer wall of the secondary input pipe (302). The bottom of the adhesion tank (307) is provided with a collection bottle (305).

7. A dehydration device for purifying liquefied natural gas according to claim 6, characterized by: The secondary dewatering assembly (3) also includes a support shaft (306) rotatably disposed inside the adhesion tank (307). The outer wall of the support shaft (306) is provided with multiple rotating blades (303). The outer wall of the adhesion tank (307) is fixedly connected to a drive motor (304), and the output end of the drive motor (304) is fixedly connected to the support shaft (306).

8. The dehydration device for purifying liquefied natural gas according to claim 6, characterized by: The output end of the molecular sieve adsorption tower (4) is provided with a connecting port (11).

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