Separating device based on LNG (Liquefied Natural Gas) cold energy utilization

Abstract

The utility model relates to the technical field of LNG (Liquefied Natural Gas) separation devices, in particular to a separation device based on LNG cold energy utilization. The separation device comprises a first separation tower, a first condenser, a second separation tower, a second condenser, a first cold energy guide pipe and a second cold energy guide pipe, the first separation tower is externally connected with a feeding pipe; the bottom end of the first separation tower is communicated with the top of the second condenser through the second separation tower; the top end of the first separation tower is communicated with the top of the first condenser; the side lower part of the first separation tower is communicated with the side part of the first condenser through a first cold energy guide pipe; the first cold energy guide pipe further communicates with the side portion of the second condenser through a second cold energy guide pipe. A discharge pipe is also arranged at the bottom end of the second separation tower. According to the utility model, while the separation is realized, the required refrigeration energy consumption is reduced through cold energy utilization, and the energy utilization efficiency is improved, so that the problem of cold energy waste in the background technology is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to LNG separation device technical field, concretely is a kind of separation device based on LNG cold energy utilization. BACKGROUND

[0002] LNG is liquefied natural gas, main component is methane, is a clean fossil energy, in global LNG trade, due to the different natural gas exploitation region, the LNG component exported by each country is also different, the alkane contained in LNG is all excellent chemical raw material, if for producing ethylene, can light ethylene raw material, energy consumption reduces 30%~40%, greatly reduce environmental pollution, simultaneously reduce the production cost of ethylene, therefore need separation device to realize the separation of methane and C2+ in LNG raw material, then realize the separation of C2 and LPG.

[0003] LNG (liquefied natural gas) is separated, lighter components will gather in tower top, then need to be condensed into liquid state output, need to use refrigerant when condensing, and LNG will release a large amount of cold energy in gasification process, if these cold energy cannot be utilized, not only will increase the energy consumption of separation process, also will improve operating cost, cause waste.Therefore provide a kind of separation device based on LNG cold energy utilization. SUMMARY

[0004] The utility model aims at providing a kind of separation device based on LNG cold energy utilization to solve the problem of cold energy waste in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of separation device based on LNG cold energy utilization, including first separation tower, first condenser, second separation tower, second condenser, first cold energy conduit and second cold energy conduit;

[0007] The first separation tower is circumscribed with feed pipe;And the bottom end of the first separation tower is communicated with the top of second condenser through second separation tower;The top of the first separation tower is communicated with the top of first condenser;The side lower part of the first separation tower is communicated with the side of first condenser by first cold energy conduit;The first cold energy conduit is also communicated with the side of second condenser by second cold energy conduit;The bottom end of the second separation tower is also provided with discharge pipe.

[0008] Further limit, first pressure regulating valve is arranged on the feed pipe.

[0009] Further limit, guide pipe is arranged between the bottom end of the first separation tower and the top of second condenser;Second pressure regulating valve is arranged on the guide pipe.

[0010] Further limited, the first cold energy conduit is provided with a gas pump.

[0011] Further limited, the first separation tower is provided with a first pressure sensor, and the second separation tower is provided with a second pressure sensor.

[0012] Further limited, the first condenser is internally provided with a first condensing chamber, the first condensing chamber is internally provided with a first condensing pipe, the first cold energy conduit is communicated with the first condensing chamber, and the first separation tower is communicated with the first condensing pipe.

[0013] Further limited, the second condenser is internally provided with a second condensing chamber, the second condensing chamber is internally provided with a second condensing pipe, the second cold energy conduit is communicated with the second condensing chamber, and the second separation tower is communicated with the second condensing pipe.

[0014] Further limited, a first collecting groove communicated with the first condensing pipe is arranged below the first condenser, and a second collecting groove communicated with the second condensing pipe is arranged below the second condenser.

[0015] Further limited, the first separation tower and the second separation tower are both externally provided with a heating jacket, and a heating element is arranged at a central position in the heating jacket.

[0016] Further limited, heat-conducting rings are arranged at both ends in the heating jacket, and the heat-conducting rings are connected with the heating element through heat-conducting rods.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1、In the utility model, the light component separated from the LNG raw material is condensed into liquid product output through the first separation tower, the second separation tower, the first condenser and the second condenser, and the heavy component is further separated to obtain C2 component and LPG component; meanwhile, a large amount of cold energy is released in the gasification process of the LNG raw material at the bottom of the first separation tower, and the cold energy enters the first condenser and the second condenser through the first cold energy conduit and the second cold energy conduit respectively, so that the energy utilization efficiency is improved, the energy consumption and emission of the system are reduced, and the environmental protection requirement is met.

[0019] 2、In the utility model, the first pressure sensor and the second pressure sensor are used to monitor the pressure change in the first separation tower and the second separation tower in real time, and then the valve opening degree of the first pressure regulating valve and the valve opening degree of the second pressure regulating valve are adjusted according to the feedback pressure value, so that the separation pressure in the first separation tower and the separation pressure in the second separation tower are controlled, the separation efficiency is improved, and the stable operation of the separator is ensured.

[0020] 3. The utility model discloses a heating jacket, heating element and heat conducting ring and heat conducting rod are arranged in the first separating tower and the second separating tower, and the heating jacket, heating element, heat conducting ring and heat conducting rod form a heating structure, which can ensure that the raw materials are gradually gasified, improve the heating efficiency and save energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawing needed to be used in the embodiment, should understand, the following drawing only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0022] Figure 1 It is the front view structure schematic diagram of the utility model;

[0023] Figure 2 It is the first condenser section structure schematic diagram of the utility model;

[0024] Figure 3 It is the first separating tower section structure schematic diagram of the utility model;

[0025] Figure 4 It is the heating jacket overhead section structure schematic diagram of the utility model;

[0026] Figure 5 It is the second separating tower section structure schematic diagram of the utility model;

[0027] In the drawing:

[0028] 1, separating device main body;2, first separating tower;3, feed pipe;4, first pressure regulating valve;5, guide pipe;6, second pressure regulating valve;7, air pump;8, discharge pipe;9, first condenser;10, second separating tower;11, second condenser;12, first pressure sensor;13, first cold energy guide pipe;14, first condensing chamber;15, first condensing pipe;16, second cold energy guide pipe;17, first collection groove;18, heating jacket;19, heating element;20, first filler layer;21, second pressure sensor;22, heat conducting ring;23, heat conducting rod;24, second filler layer. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0031] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0032] Embodiments

[0033] Please refer to Figures 1-5 The present application provides an embodiment: a separation device based on LNG cold energy utilization includes a first separation tower 2, a first condenser 9, a second separation tower 10, a second condenser 11, a first cold energy conduit 13 and a second cold energy conduit 16.

[0034] In this embodiment, the first separation tower 2 is externally connected with a feed pipe 3; and the bottom end of the first separation tower 2 is communicated with the top of the second separation tower 10 and the second condenser 11; the top end of the first separation tower 2 is communicated with the top of the first condenser 9; the side lower part of the first separation tower 2 is communicated with the side of the first condenser 9 through the first cold energy conduit 13; the first cold energy conduit 13 is further communicated with the side of the second condenser 11 through the second cold energy conduit 16; and the bottom end of the second separation tower 10 is further provided with a discharge pipe 8.

[0035] In this embodiment, the first cold energy conduit 13 is provided with an air pump 7. The first cold energy conduit 13 is communicated with the first condenser 9 and the second cold energy conduit 16 through the air pump 7. In the implementation, a large amount of cold energy is released during the gasification of the LNG raw material in the first separation tower 2, which enters the first condenser 9 and the second condenser 11 through the first cold energy conduit 13 and the second cold energy conduit 16, respectively, reduces the refrigeration energy consumption required by the first condenser 9 and the second condenser 11 when condensing methane and C2+ components, improves energy utilization efficiency, reduces system energy consumption and emissions, and meets environmental protection requirements.

[0036] Preferably, the first separation tower 2 is provided with a first packing layer 20, and the second separation tower 10 is provided with a second packing layer 24, so that the mass transfer efficiency is improved by the first packing layer 20 and the second packing layer 24, thereby improving the separation efficiency of the materials (LNG and C2+ components).

[0037] In the embodiment, the feed pipe 3 is provided with a first pressure regulating valve 4. The bottom end of the first separation tower 2 is connected to the top of the second condenser 11 through a guide pipe 5, and the guide pipe 5 is provided with a second pressure regulating valve 6. The first separation tower 2 is provided with a first pressure sensor 12, and the second separation tower 10 is provided with a second pressure sensor 21.

[0038] In use, the first pressure sensor 12 and the second pressure sensor 21 monitor the pressure changes in the first separation tower 2 and the second separation tower 10 in real time, and then the valve opening degree of the first pressure regulating valve 4 and the valve opening degree of the second pressure regulating valve 6 are adjusted according to the feedback pressure value, so as to control the separation pressure in the first separation tower 2 and the separation pressure in the second separation tower 10. The separation pressure in the first separation tower 2 and the separation pressure in the second separation tower 10 are not limited here, and are limited according to the composition of the actual separation raw material, which is not described here.

[0039] Referring to Figure 2 In the embodiment, the first condenser 9 is provided with a first condensing chamber 14, and the first condensing chamber 14 is provided with a first condensing pipe 15. The first cold energy guide pipe 13 is in communication with the first condensing chamber 14, and the first separation tower 2 is in communication with the first condensing pipe 15.

[0040] In the embodiment, the first condenser 9 is further provided with a first collection tank 17 in communication with the first condensing pipe 15. After the LNG raw material is heated and gasified, due to the different boiling points of methane and C2+ components, methane as a lighter component is mainly enriched at the top of the first separation tower 2 and enters the first condensing pipe 15 through a gas guide pipe. The coolant is added to the first condensing chamber 14 to exchange heat with the methane in the first condensing pipe 15, so that the methane is condensed into a liquid product and collected through the first collection tank 17. The C2+ component is a heavier component, which is enriched at the bottom of the first separation tower 2 and enters the second separation tower 10 through the guide pipe 5.

[0041] In the embodiment, the second condenser 11 has the same structure as the first condenser 9. Specifically, the second condenser 11 is internally provided with a second condensing chamber; the second condensing chamber is internally provided with a second condensing pipe; the second condensing pipe 16 is in communication with the second condensing chamber; and the second separating tower is in communication with the second condensing pipe. A second collecting tank in communication with the second condensing pipe is arranged below the second condenser 11. The C2+ component mixture is gradually gasified after being heated in the second separating tower 10. Since the boiling points of the C2 component (ethane) and the LPG component (mainly propane and butane) are different, the C2 component (ethane) is mainly enriched at the top of the second separating tower 10 and enters the second collecting tank after being condensed into a liquid product by the second condensing pipe in the second condenser 11, and the LPG component is enriched at the bottom of the second separating tower 10 and is output through the discharge pipe 8 as a heavier component.

[0042] Referring to Figure 3 、 Figure 4 and Figure 5 In the embodiment, the outer side of the first separating tower 2 and the outer side of the second separating tower 10 are both provided with a heating jacket 18, and a heating element 19 is arranged at the central position in the heating jacket 18. Both ends of the heating jacket 18 are provided with heat-conducting rings 22, and the heat-conducting rings 22 are connected with the heating element 19 through heat-conducting rods 23. In use, the heating element 19 in the heating jacket 18 generates heat after being powered on, and the heat is uniformly transmitted to the heat-conducting rings 22 through the heat-conducting rods 23. The heat-conducting rings 22 are clamped on the outer wall of the first separating tower 2, and can uniformly heat the raw materials entering the interiors of the first separating tower 2 and the second separating tower 10 to make them gradually gasify, thereby saving energy consumption and improving heating efficiency.

[0043] The separation device based on LNG cold energy utilization provided by the utility model further includes a separation device main body 1, and the first separating tower 2, the first condenser 9, the second separating tower 10 and the second condenser 11 are all arranged on the separation device main body 1. In this way, on the one hand, the separation device main body 1 supports various devices to improve stability; on the other hand, the separation device main body 1 integrates various devices, thereby reducing space and facilitating the connection between devices.

[0044] It should be noted that: in the utility model, the C2+ component refers to a component with carbon atoms greater than or equal to 2; in addition, the specific model specifications of the first pressure regulating valve 4, the second pressure regulating valve 6, the first pressure sensor 12, the second pressure sensor 21 and the heating element 19 are determined according to the processing capacity of the device and the like through selection calculation, the selection calculation method is prior art, and therefore will not be described in detail.

[0045] The separation device based on LNG cold energy utilization provided by the utility model has the working principle that:

[0046] The LNG raw material enters the first separation tower 2 through the feed pipe 3, the heating element 19 in the heating jacket 18 is powered to generate heat, the heat is uniformly transmitted to the heat conducting ring 22 through the heat conducting rod 23, the heat conducting ring 22 is clamped on the outer wall of the first separation tower 2, and the LNG raw material inside can be uniformly heated to gradually gasify, energy consumption is saved while the heating efficiency is ensured, after the LNG raw material is heated and gasified, the LNG raw material is contacted and heat-exchanged with the liquid on the first filler layer 20, due to the different boiling points of methane and C2+ components, the methane as a lighter component is mainly enriched at the top of the first separation tower 2 and enters the first condenser 9 to be condensed into a liquid product and then is collected in the first collection tank 17; the C2+ component mixture is heavier and is enriched at the bottom of the first separation tower 2 and enters the second separation tower 10 through the guide pipe 5, the C2+ component mixture in the second separation tower 10 is heated by the heating jacket 18, the heating element 19, the heat conducting ring 22 and the heat conducting rod 23 and is gradually gasified, and is contacted and heat-exchanged with the liquid on the second filler layer 24, due to the different boiling points of the C2 component (ethane) and the LPG component (mainly propane and butane), the C2 component is mainly enriched at the top of the second separation tower 10 and enters the second condenser 11 to be condensed into a liquid product and then is collected in the second collection tank, and the LPG component is heavier and is enriched at the bottom of the second separation tower 10 and is output through the discharge pipe 8; in the bottom area of the first separation tower 2, a large amount of cold energy is released during the gasification of the LNG raw material, and the cold energy is correspondingly introduced into the first condenser 9 and the second condenser 11 through the first cold energy guide pipe 13 and the second cold energy guide pipe 16, respectively, so that the refrigeration energy consumption of the first condenser 9 and the second condenser 11 during condensation is reduced, the energy utilization efficiency is improved, the energy consumption and emission of the system are reduced, and the environmental protection requirement is met.

[0047] The preferred embodiments of the utility model are merely used for limiting the utility model, and the utility model can be changed and varied in various ways for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A separation device based on LNG cold energy utilization, characterized in that, The first separation tower (2), the first condenser (9), the second separation tower (10), the second condenser (11), the first cold energy conduit (13) and the second cold energy conduit (16) are included. The first separation tower (2) is externally connected with the feed pipe (3); the bottom end of the first separation tower (2) is communicated with the top of the second separation tower (10) and the second condenser (11); the top end of the first separation tower (2) is communicated with the top of the first condenser (9); the side lower part of the first separation tower (2) is communicated with the side of the first condenser (9) through the first cold energy conduit (13); the first cold energy conduit (13) is further communicated with the side of the second condenser (11) through the second cold energy conduit (16); the bottom end of the second separation tower (10) is further provided with the discharge pipe (8).

2. The separation device based on LNG cold energy utilization according to claim 1, characterized in that, The first pressure regulating valve (4) is arranged on the feed pipe (3).

3. The separation device based on LNG cold energy utilization according to claim 2, characterized in that, The guide pipe (5) is arranged between the bottom end of the first separation tower (2) and the top of the second condenser (11); the second pressure regulating valve (6) is arranged on the guide pipe (5).

4. The separation device based on LNG cold energy utilization according to claim 3, characterized in that, The air pump (7) is arranged on the first cold energy conduit (13).

5. The separation device based on LNG cold energy utilization according to claim 4, characterized in that, The first pressure sensor (12) is arranged on the first separation tower (2); the second pressure sensor (21) is arranged on the second separation tower (10).

6. The separation device based on LNG cold energy utilization according to claim 5, characterized in that, The first condenser (9) is provided with the first condensing chamber (14); the first condensing chamber (14) is internally provided with the first condensing pipe (15); the first cold energy conduit (13) is communicated with the first condensing chamber (14); the first separation tower (2) is communicated with the first condensing pipe (15).

7. The separation device based on LNG cold energy utilization according to claim 6, characterized in that, The second condenser (11) is provided with the second condensing chamber; the second condensing chamber is internally provided with the second condensing pipe; the second cold energy conduit (16) is communicated with the second condensing chamber; the second separation tower is communicated with the second condensing pipe.

8. The separation device based on LNG cold energy utilization according to claim 7, characterized in that, The first condenser (9) is provided with the first collecting groove (17) communicated with the first condensing pipe (15); the second condenser (11) is provided with the second collecting groove communicated with the second condensing pipe.

9. The separation device based on LNG cold energy utilization according to any one of claims 1-8, characterized in that, The heating jacket (18) is arranged on the outside of the first separation tower (2) and the second separation tower (10); the heating element (19) is arranged at the central position inside the heating jacket (18).

10. The separation device based on LNG cold energy utilization according to claim 9, characterized in that: The heat conducting ring (22) is arranged at both ends inside the heating jacket (18); the heat conducting rod (23) is connected with the heating element (19) and uniformly passes through the heat conducting ring (22).

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