Pressure reduction and heat exchange system for natural gas

Abstract

The utility model belongs to the technical field of natural gas, and discloses a pressure reduction heat exchange system for natural gas, which comprises a first pipeline assembly, a second pipeline assembly, a heat exchange pipeline assembly and a collecting pipeline. The first pipeline assembly is provided with a first gas inlet, a first gas outlet and a pressure reduction heat exchange device, the first gas inlet is used for receiving first natural gas, the pressure reduction heat exchange device is used for reducing the pressure of the first natural gas, the heat exchange pipeline assembly is provided with a first heat exchange part and a second heat exchange part which are arranged at intervals, and heat exchange liquid is arranged in the heat exchange pipeline assembly; the heat exchange liquid moves in the heat exchange pipeline assembly, the first heat exchange part and the pressure reduction heat exchange device are oppositely arranged, the second pipeline assembly is provided with a second gas inlet, a second gas outlet and a third heat exchange part, the second gas inlet is used for receiving second natural gas, and the third heat exchange part and the second heat exchange part are oppositely arranged. According to the pressure reduction heat exchange system for the natural gas, an additional heat source does not need to be arranged, the situation that a large amount of energy is consumed is avoided, and the energy consumption loss of the compressor unit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas technical field especially relates to a natural gas pressure reducing heat exchange system. BACKGROUND

[0002] Oil and gas fields will produce scattered, small amount of scattered natural gas in the development process, including scattered single well gas, low-yield gas well gas and oilfield associated gas. They are either because of small gas production, or because of far away from the pipeline system, often can only be vented and burned, causing energy waste and environmental pollution. In order to reduce waste, scattered natural gas is mostly compressed by compressor to high pressure compressed natural gas (CNG) at wellhead, transported to natural gas station / valve room by CNG transport vehicle, and transmitted to natural gas trunk pipeline.

[0003] The existing CNG transport vehicle loading natural gas station / valve room includes two processes. When the CNG pressure is higher than the station / valve room pressure, process 1, i.e. pressure reducing process, is carried out: about 20 MPa CNG is filtered, heated (natural gas preheating, to prevent hydrate formation below 0℃ after pressure reducing throttle cooling), pressure reduced (pressure from 20 MPa to about 5-10 MPa of station / valve room operating pressure, accompanied by significant throttle cooling of natural gas during pressure regulating process), metered, flow controlled and then transmitted to the station / valve room, and then transmitted to the natural gas transmission pipeline. When the CNG pressure gradually decreases and is lower than the natural gas station / valve room operating pressure, process 2, i.e. pressure increasing transmission process, is carried out: 0-10 MPa CNG is filtered, compressed by compressor, metered, flow controlled and then transmitted to the station / valve room, and then transmitted to the natural gas transmission pipeline.

[0004] However, it is found in application that when process 1 is carried out, about 20 MPa CNG is pressure reduced to 5-10 MPa by pressure reducing valve, and the CNG is significantly pressure reduced, throttled and cooled, the CNG temperature after the pressure reducing valve will be lower than 0℃, causing hydrate to block the pipeline. In order to avoid the formation of hydrate, the CNG needs to be preheated to 50℃ or higher temperature before pressure reduction. The heating process requires additional heat source, consumes a large amount of energy, at the same time, the external energy source will cause the CNG entropy value to increase significantly, which will further increase the energy consumption of the compressor unit of the gas compression station after being mixed into the natural gas transmission pipeline, resulting in large energy consumption of the compressor unit of the gas compression station.

[0005] Therefore, there is an urgent need for a natural gas pressure reducing heat exchange system to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a natural gas pressure reducing heat exchange system to solve the problem of requiring additional heat source, consuming a large amount of energy and large energy consumption of the compressor unit of the gas compression station in the prior art.

[0007] The technical scheme adopted by the utility model is as follows:

[0008] The natural gas pressure-reducing heat exchange system comprises:

[0009] The first pipeline assembly has a first gas inlet, a first gas outlet and a pressure-reducing heat exchange device, the first gas inlet is used for receiving first natural gas, and the pressure-reducing heat exchange device is used for reducing the pressure of the first natural gas.

[0010] The heat exchange pipeline assembly has a first heat exchange part and a second heat exchange part arranged at intervals, heat exchange liquid is arranged in the heat exchange pipeline assembly, the heat exchange liquid moves in the heat exchange pipeline assembly, the first heat exchange part is arranged opposite to the pressure-reducing heat exchange device and is used for adjusting the temperature of the pressure-reducing heat exchange device.

[0011] The second pipeline assembly has a second gas inlet, a second gas outlet and a third heat exchange part, the second gas inlet is used for receiving second natural gas, the third heat exchange part is arranged opposite to the second heat exchange part and is used for adjusting the temperature of the second heat exchange part, and the temperature of the second natural gas is higher than that of the first natural gas.

[0012] The first gas outlet and the second gas outlet are both connected to the collecting pipeline.

[0013] Further, the two ends of the heat exchange pipeline assembly are connected, and the heat exchange liquid moves along the extension direction of the heat exchange pipeline assembly.

[0014] Further, the heat exchange pipeline assembly comprises a heat exchange pipeline and a driving member, the driving member, the first heat exchange part and the second heat exchange part are all arranged in the heat exchange pipeline, the heat exchange liquid is located in the heat exchange pipeline, and the driving member is used for driving the heat exchange liquid to move in the heat exchange pipeline.

[0015] Further, the heat exchange pipeline assembly comprises a heat exchange pipeline and a driving member, the first heat exchange part and the second heat exchange part are both formed by part of the heat exchange pipeline, the driving member is installed on the heat exchange pipeline, the heat exchange liquid is located in the heat exchange pipeline, and the driving member is used for driving the heat exchange liquid to move in the heat exchange pipeline.

[0016] Further, the first heat exchange part and the second heat exchange part are both formed by bending part of the heat exchange pipeline, and the first heat exchange part and the second heat exchange part are both in a wave shape.

[0017] Further, the first pipeline assembly comprises a first pipeline, the first gas inlet and the first gas outlet are respectively located at the two ends of the first pipeline, and the pressure-reducing heat exchange device is arranged at one end of the first pipeline close to the first gas inlet.

[0018] Further, the first pipeline assembly further comprises a detection assembly, the detection assembly is arranged in the first pipeline, the detection assembly is located between the pressure reducing heat exchange device and the first gas outlet, the detection assembly comprises a detection member and a control member, the detection member is used for detecting the flow of the first natural gas in the first pipeline, and the control member controls the flow of the first natural gas in the first pipeline.

[0019] Further, the second pipeline assembly comprises a second pipeline, the second gas inlet and the second gas outlet are located at two ends of the second pipeline respectively, and the third heat exchange part is arranged in the second pipeline.

[0020] Further, the third heat exchange part is formed by bending part of the second pipeline, and the third heat exchange part is in a wave shape.

[0021] Further, the second gas inlet is communicated with a third pipeline, and is located at one end of the third pipeline close to a third gas inlet of the third pipeline, the third gas inlet is used for receiving the second natural gas, and a fourth gas outlet of the collecting pipeline is communicated with the third pipeline and is located at one end of the third pipeline close to a third gas outlet of the third pipeline.

[0022] The utility model discloses beneficial effects:

[0023] The utility model provides a kind of natural gas pressure reducing heat exchange system, including first pipeline component, second pipeline component, heat exchange pipeline component and collection pipeline.First pipeline component has first gas inlet, first gas outlet and pressure reducing heat exchange device, first gas inlet is used to receive first natural gas, pressure reducing heat exchange device is used to reduce the pressure of first natural gas, heat exchange pipeline component has interval arrangement first heat exchange part and second heat exchange part, heat exchange pipeline component is provided with heat exchange liquid, heat exchange liquid moves in heat exchange pipeline component, first heat exchange part is oppositely arranged with pressure reducing heat exchange device, for adjusting the temperature of pressure reducing heat exchange device, second pipeline component has second gas inlet, second gas outlet and third heat exchange part, second gas inlet is used to receive second natural gas, third heat exchange part is oppositely arranged with second heat exchange part, for adjusting the temperature of second heat exchange part, the temperature of second natural gas is higher than the temperature of first natural gas, and first gas outlet and second gas outlet are all connected with collection pipeline.The temperature of second natural gas is higher than the temperature of first natural gas, third heat exchange part can heat transfer to second heat exchange part, improve the temperature of second heat exchange part, and then heat the heat exchange liquid in second heat exchange part, heat exchange liquid moves in heat exchange pipeline component, and heated heat exchange liquid can move to first heat exchange part, since first heat exchange part is oppositely arranged with pressure reducing heat exchange device, and the temperature of second natural gas is higher than the temperature of first natural gas, first heat exchange part can heat first natural gas in pressure reducing heat exchange device, while pressure reducing heat exchange device reduces the pressure of first natural gas, to realize the pressure reduction and temperature rise of first natural gas, i.e. directly using second natural gas to heat first natural gas, without setting additional heat source, avoid the case of consuming a large amount of energy.At the same time, using second natural gas to heat first natural gas, the temperature of first natural gas increases, and the temperature of second natural gas decreases, compared with the prior art of setting additional heat source to heat first natural gas, the temperature of first natural gas and second natural gas after collection in the embodiment is lower than the temperature of first natural gas and second natural gas after collection of setting additional heat source, which reduces the energy consumption of gas compressor unit. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings for those skilled in the art without creating labor.

[0025] Figure 1 It is the structure schematic diagram of natural gas pressure reducing heat exchange system provided by the embodiments of the utility model.

[0026] In the drawing:

[0027] 1, first pipeline; 11, first air inlet; 12, second valve body; 2, pressure reducing heat exchange device; 21, first pressure reducing valve; 22, first heat exchange tube bundle; 23, second pressure reducing valve; 24, second heat exchange tube bundle; 3, detection assembly; 4, heat exchange pipeline; 41, first heat exchange part; 42, second heat exchange part; 43, driving piece; 5, second pipeline; 51, second air inlet; 52, third valve body; 53, third heat exchange part; 54, fourth valve body; 6, collecting pipeline; 61, fourth air outlet; 62, fifth valve body; 7, third pipeline; 71, third air inlet; 72, third air outlet; 73, first valve body; 8, first heat exchange assembly; 9, second heat exchange assembly. DETAILED DESCRIPTION

[0028] To make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for convenience of description, not all.

[0029] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the embodiment, if not specially stated, "a plurality of" specifically refers to two or more than two.

[0032] In the description of the present embodiment, the terms "upper", "lower", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0033] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a mediating element.

[0034] The technical scheme of the present application will be further illustrated below in conjunction with the drawings and through specific embodiments.

[0035] The natural gas pressure reducing and heat exchanging system provided by the present application does not need to set an additional heat source, avoids the consumption of a large amount of energy, and reduces the energy consumption loss of the compressor unit.

[0036] For example, Figure 1As shown, the natural gas pressure reduction heat exchange system comprises a first pipeline assembly (not shown in the figure), a second pipeline assembly (not shown in the figure), a heat exchange pipeline assembly (not shown in the figure), and a collecting pipeline 6. The first pipeline assembly has a first gas inlet 11 for receiving first natural gas, a first gas outlet (not shown in the figure), and a pressure reduction heat exchange device 2 for reducing the pressure of the first natural gas. The heat exchange pipeline assembly has a first heat exchange part 41 and a second heat exchange part 42 arranged at intervals, and a heat exchange liquid is arranged in the heat exchange pipeline assembly and moves in the heat exchange pipeline assembly. The first heat exchange part 41 is arranged opposite to the pressure reduction heat exchange device 2 and is used to adjust the temperature of the pressure reduction heat exchange device 2. The second pipeline assembly has a second gas inlet 51 for receiving second natural gas, a second gas outlet (not shown in the figure), and a third heat exchange part 53 arranged opposite to the second heat exchange part 42 and used to adjust the temperature of the second heat exchange part 42. The temperature of the second natural gas is higher than that of the first natural gas. The first gas outlet and the second gas outlet are both in communication with the fourth gas inlet of the collecting pipeline 6. It can be understood that, since the temperature of the second natural gas is higher than that of the first natural gas, the third heat exchange part 53 can perform heat transfer to the second heat exchange part 42, increase the temperature of the second heat exchange part 42, and then heat the heat exchange liquid in the second heat exchange part 42. The heat exchange liquid moves in the heat exchange pipeline assembly and can move to the first heat exchange part 41. Since the first heat exchange part 41 is arranged opposite to the pressure reduction heat exchange device 2, and the temperature of the second natural gas is higher than that of the first natural gas, the first heat exchange part 41 can heat the first natural gas in the pressure reduction heat exchange device 2, while the pressure reduction heat exchange device 2 reduces the pressure of the first natural gas, thereby realizing pressure reduction and temperature increase of the first natural gas, i.e., directly heating the first natural gas using the second natural gas, without the need to set an additional heat source, thereby avoiding the consumption of a large amount of energy. At the same time, the use of the second natural gas to heat the first natural gas increases the temperature of the first natural gas and reduces the temperature of the second natural gas. Compared with the prior art of setting an additional heat source to heat the first natural gas, the temperature of the first natural gas and the second natural gas after being collected in the embodiment is lower than that of the first natural gas and the second natural gas after being collected by setting an additional heat source to heat the first natural gas, thereby reducing the energy consumption of the compressor unit of the gas compression station.

[0037] It should be noted that the temperature of the second natural gas is higher than that of the first natural gas and higher than that of the heat exchange liquid. The temperature of the heat exchange liquid is higher than or equal to that of the first natural gas. In the embodiment, the temperature of the heat exchange liquid is higher than that of the first natural gas, so as to more efficiently heat the first natural gas.

[0038] In this embodiment, the first natural gas is compressed natural gas (CNG). The second natural gas can be conventional natural gas, or it can be low-grade natural gas (natural gas resources that are difficult to extract and have low permeability), as long as it meets the usage requirements. This embodiment does not impose any specific limitations.

[0039] For example, the heat exchange fluid serves as the medium for heat exchange. The heat exchange fluid can be an ethylene glycol solution, which has a low freezing point and good thermal conductivity, facilitating heat transfer. Of course, in other embodiments, the heat exchange fluid can also be water. Using water instead of ethylene glycol can further reduce costs. The specific type of heat exchange fluid is chosen to meet the usage requirements; this embodiment does not impose any specific limitations.

[0040] Furthermore, the two ends of the heat exchange pipeline assembly are connected, and the heat exchange fluid moves along the extension direction of the heat exchange pipeline assembly. In other words, the heat exchange pipeline assembly is connected end to end, and the heat exchange pipeline assembly is a closed structure. The heat exchange fluid circulates along the extension direction of the heat exchange pipeline assembly to achieve multiple heat exchanges, further improving the heating effect on the pressure reducing heat exchange device 2, thereby improving the heating effect on the first natural gas. In this embodiment, the two ends of the heat exchange pipeline assembly can be connected through existing pipeline joints, which facilitates the injection of heat exchange fluid into the heat exchange pipeline assembly before use, making it convenient to use. Of course, in other embodiments, the two ends of the heat exchange pipeline assembly can also be connected in other ways to meet the usage requirements. This embodiment does not specifically limit the specific connection method of the two ends of the heat exchange pipeline assembly.

[0041] like Figure 1 As shown, it can be further understood that the third heat exchange section 53 and the second heat exchange section 42 are arranged opposite each other to exchange heat, forming the first heat exchange assembly 8. The first heat exchange section 41 and the pressure reducing heat exchange device 2 are arranged opposite each other to exchange heat, forming the second heat exchange assembly 9. During the circulation of the heat exchange liquid along the extension direction of the heat exchange pipeline assembly, the heat exchange liquid is heated at the first heat exchange assembly 8 and heated at the second heat exchange assembly 9 to reduce the temperature of the heat exchange liquid. Then the circulation continues, and the heat exchange liquid in the heat exchange pipeline assembly continuously heats the pressure reducing heat exchange device 2, thereby improving the heating effect on the first natural gas.

[0042] Further, the heat exchange pipeline assembly comprises the heat exchange pipeline 4 and a driving member 43, the driving member 43, the first heat exchange part 41 and the second heat exchange part 42 are all arranged in the heat exchange pipeline 4, the heat exchange liquid is located in the heat exchange pipeline 4, and the driving member 43 is used for driving the heat exchange liquid to move in the heat exchange pipeline 4. Specifically, the driving member 43, the first heat exchange part 41 and the second heat exchange part 42 are all in communication with the heat exchange pipeline 4, and the driving member 43 is used for driving the heat exchange liquid to move in the heat exchange pipeline 4, the driving member 43, the first heat exchange part 41 and the second heat exchange part 42. It can be understood that by arranging the driving member 43, the heat exchange liquid is facilitated to move and circulate in the heat exchange pipeline 4, the first heat exchange part 41 and the second heat exchange part 42, and the heating effect of the pressure reducing heat exchange device 2 is improved. In this embodiment, the driving member 43 includes but is not limited to a water pump.

[0043] Exemplarily, the first heat exchange part 41 and the second heat exchange part 42 can both be existing heat exchangers, such as heat pipe heat exchangers, both ends of the first heat exchange part 41 and both ends of the second heat exchange part 42 are in communication with the heat exchange pipeline 4, and the heat exchange liquid moves and circulates in the heat exchange pipeline 4, the first heat exchange part 41 and the second heat exchange part 42.

[0044] Of course, in other embodiments, the first heat exchange part 41 and the second heat exchange part 42 are both formed by part of the heat exchange pipeline 4. Specifically, the first heat exchange part 41 and the second heat exchange part 42 are both formed by bending part of the heat exchange pipeline 4, and both are in a wave shape. It can be understood that by bending part of the heat exchange pipeline 4 to form a wave-shaped heat exchange part, the first heat exchange part 41 and the second heat exchange part 42 are directly formed by the heat exchange pipeline 4, without the need for additional heat exchange members. For the specific types and structures of the first heat exchange part 41 and the second heat exchange part 42, the use requirements are met, and this embodiment is not limited in particular.

[0045] Further, the first pipeline assembly comprises the first pipeline 1, the first gas inlet 11 and the first gas outlet are located at both ends of the first pipeline 1, and the pressure reducing heat exchange device 2 is arranged on one side of the first pipeline 1 close to the first gas inlet 11. It can be understood that the pressure reducing heat exchange device 2 is arranged at one end of the first pipeline 1 close to the first gas inlet 11, so that the first natural gas is facilitated to be subjected to pressure reduction when entering the first pipeline 1 through the first gas inlet 11, and other structures are facilitated to be arranged at a position of the first pipeline 1 between the pressure reducing heat exchange device 2 and the first gas outlet.

[0046] Further, the first pipeline assembly further comprises a detection assembly 3, the detection assembly 3 is arranged on the first pipeline 1, and the detection assembly 3 is located between the pressure reducing heat exchange device 2 and the first gas outlet. Specifically, the detection assembly 3 comprises a detection member (not shown in the figure) and a control member (not shown in the figure), the detection member is used for detecting the flow of the first natural gas in the first pipeline 1, and the control member controls the flow of the first natural gas in the first pipeline 1. Specifically, the detection assembly 3 comprises the detection member and the control member in communication. It can be understood that by arranging the detection assembly 3, the flow of the first natural gas can be detected, and the flow of the first natural gas can be adjusted, so that the flow of the first natural gas can be determined according to the actual situation, and the operation is convenient. For example, when the temperature of the second natural gas is not very high, the flow of the first natural gas can be appropriately reduced to ensure the heating effect of the second heat exchange part 42 on the first natural gas. In the embodiment, the detection member includes but is not limited to an existing flow meter, and the control member includes but is not limited to an existing regulating valve. For the specific types of the detection member and the control member, the use requirements can be met, and the embodiment is not limited in particular.

[0047] In the embodiment, a second valve body 12 is further arranged between the detection assembly 3 and the first gas outlet to control the opening and closing of the first pipeline 1, and the second valve body 12 includes but is not limited to a ball valve.

[0048] Further, the second pipeline assembly comprises a second pipeline 5, a second gas inlet 51 and a second gas outlet are located at two ends of the second pipeline 5, and a third heat exchange part 53 is arranged on the second pipeline 5. Specifically, the third heat exchange part 53 is located between the second gas inlet 51 and the third gas inlet 71, and when the second natural gas passes through the third heat exchange part 53, the third heat exchange part 53 heats the second heat exchange part 42 because the temperature of the second natural gas is higher than the temperature of the heat exchange liquid and the second heat exchange part 42, and then heats the heat exchange liquid, and the heat exchange liquid moves to the first heat exchange part 41 to heat the pressure reducing heat exchange device 2, and then heats the first natural gas. In the embodiment, a third valve body 52 is arranged between the third heat exchange part 53 and the second gas outlet, a fourth valve body 54 is arranged between the third heat exchange part 53 and the second gas inlet 51, and the third valve body 52 and the fourth valve body 54 can control the opening and closing of the second pipeline 5. The third valve body 52 includes but is not limited to a throttling stop valve, and the fourth valve body 54 includes but is not limited to a station ball valve. For the types of the third valve body 52 and the fourth valve body 54, the use requirements can be met, and the embodiment is not limited in particular.

[0049] Exemplarily, the third heat exchange part 53 is formed by bending part of the second pipeline 5, and the third heat exchange part 53 is in a wave shape. It can be understood that, by bending part of the second pipeline 5 to form the third heat exchange part 53 in a wave shape, the third heat exchange part 53 is directly formed by the second pipeline 5, without the need for an additional heat exchange part, reducing the steps of connecting the second pipeline 5 and the heat exchange part, convenient operation, and the third heat exchange part 53 is in a wave shape, increasing the heat exchange area of the third heat exchange part 53, and further improving the heat exchange effect of the second heat exchange part 42.

[0050] It is further conceivable that the second heat exchange part 42 can be formed by bending part of the heat exchange pipeline 4, the third heat exchange part 53 can be formed by bending part of the second pipeline 5, and the second heat exchange part 42 and the third heat exchange part 53 can be provided in a wave shape, which is beneficial to maximize the relative area of the second heat exchange part 42 and the third heat exchange part 53, and further improve the heat exchange effect of the third heat exchange part 53 and the second heat exchange part 42.

[0051] Further, the second gas inlet 51 is connected to the third pipeline 7 and located at one end of the third pipeline 7 close to the third gas inlet 71 of the third pipeline 7, and the third gas inlet 71 is used to receive the second natural gas. The fourth gas outlet 61 of the collecting pipeline 6 is connected to the third pipeline 7 and located at one end of the third pipeline 7 close to the third gas outlet 72 of the third pipeline 7. Specifically, the third pipeline 7 is a conveying pipeline for the second natural gas. It can be understood that the fourth gas outlet 61 of the collecting pipeline 6 is connected to the third pipeline 7 and located at one end of the third pipeline 7 close to the third gas outlet 72, and the second natural gas after heat exchange and the first natural gas after pressure reduction and temperature rise can be collected at the third gas outlet 72 of the third pipeline 7, realizing the collection of the first natural gas and the second natural gas. Moreover, the third pipeline 7 is a conveying pipeline for the second natural gas, and the second pipeline 5 is equivalent to being provided in parallel with part of the third pipeline 7, that is, part of the second hot gas is used for heat exchange of the second heat exchange part 42, thereby realizing heating of the first natural gas, without the need for an additional heat source to heat the first natural gas, avoiding the consumption of a large amount of energy, and being clean and environmentally friendly. In this embodiment, the fifth valve body 62 is provided between the fourth gas inlet and the fourth gas outlet 61 of the collecting pipeline 6 to control the opening and closing of the collecting pipeline 6, and the fifth valve body 62 includes but is not limited to a ball valve.

[0052] Further, the third pipeline 7 is provided with a first valve body 73, the first valve body 73 is located between the third gas inlet 71 and the third gas outlet 72, the second gas inlet 51 is communicated with the part of the third pipeline 7 between the third gas inlet 71 and the first valve body 73, and the fourth gas outlet 61 is communicated with the part of the third pipeline 7 between the third gas outlet 72 and the first valve body 73. In the embodiment, the first valve body 73 includes but is not limited to a gas-liquid linkage trunk valve, which plays a crucial role in the long-distance natural gas pipeline and can quickly cut off the gas trunk line in an emergency to ensure the safety of the pipeline.

[0053] In the embodiment, the pressure reducing heat exchange device 2 includes a first pressure reducing valve 21, a first heat exchange tube bundle 22, a second pressure reducing valve 23, and a second heat exchange tube bundle 24 connected in sequence, and the first heat exchange part 41 heats the first heat exchange tube bundle 22 and the second heat exchange tube bundle 24. It can be understood that, in actual operation, the first heat exchange part 41 heats the first heat exchange tube bundle 22 and the second heat exchange tube bundle 24, the first pressure reducing valve 21 reduces the pressure of the first natural gas to reduce the pressure of the second natural gas, then the first heat exchange tube bundle 22 heats the first natural gas after the first pressure reduction, then the second pressure reducing valve 23 reduces the pressure of the first natural gas after the first heating, and then the second heat exchange tube bundle 24 heats the first natural gas after the second pressure reduction. After two pressure reductions, the first natural gas is heated to ensure that the first natural gas is heated to above 0℃, so as to avoid that the temperature of the first natural gas after pressure reduction is lower than 0℃ and causes hydrate to block the pipeline.

[0054] In the embodiment, the first heat exchange tube bundle 22 and the second heat exchange tube bundle 24 are both in a wave shape, which is beneficial to improve the heat exchange effect of the first heat exchange part 41 on the first heat exchange tube bundle 22 and the second heat exchange tube bundle 24, so as to further improve the heating effect on the first natural gas.

[0055] It should be noted that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A pressure reducing heat exchange system for natural gas, characterized by, The application relates to a natural gas pipeline assembly. The first pipeline assembly comprises a first gas inlet (11) for receiving first natural gas, a first gas outlet and a pressure-reducing heat exchange device (2) for reducing the pressure of the first natural gas. The heat exchange pipeline assembly comprises a first heat exchange part (41) and a second heat exchange part (42) arranged at intervals, and heat exchange liquid is arranged in the heat exchange pipeline assembly and moves in the heat exchange pipeline assembly. The second pipeline assembly comprises a second gas inlet (51) for receiving second natural gas, a second gas outlet and a third heat exchange part (53) arranged opposite to the second heat exchange part (42) for adjusting the temperature of the second heat exchange part (42). The second natural gas has a higher temperature than the first natural gas.

2. The pressure reduction heat exchange system for natural gas according to claim 1, wherein The first gas outlet and the second gas outlet are connected to a collecting pipeline (6).

3. The pressure reduction heat exchange system for natural gas according to claim 2, wherein The two ends of the heat exchange pipeline assembly are connected, and the heat exchange liquid moves along the extension direction of the heat exchange pipeline assembly.

4. The pressure reduction heat exchange system for natural gas according to claim 2, wherein The heat exchange pipeline assembly comprises a heat exchange pipeline (4) and a driving member (43), the driving member (43), the first heat exchange part (41) and the second heat exchange part (42) are arranged in the heat exchange pipeline (4), the heat exchange liquid is arranged in the heat exchange pipeline (4), and the driving member (43) is used for driving the heat exchange liquid to move in the heat exchange pipeline (4).

5. The pressure reduction heat exchange system for natural gas according to claim 4, wherein The heat exchange pipeline assembly comprises a heat exchange pipeline (4) and a driving member (43), the first heat exchange part (41) and the second heat exchange part (42) are formed by part of the heat exchange pipeline (4), the driving member (43) is arranged in the heat exchange pipeline (4), the heat exchange liquid is arranged in the heat exchange pipeline (4), and the driving member (43) is used for driving the heat exchange liquid to move in the heat exchange pipeline (4).

6. The pressure reduction heat exchange system for natural gas according to claim 1, wherein The first heat exchange part (41) and the second heat exchange part (42) are formed by bending part of the heat exchange pipeline (4), and the first heat exchange part (41) and the second heat exchange part (42) are in a wave shape.

7. The pressure reduction heat exchange system for natural gas according to claim 6, wherein The first pipeline assembly comprises a first pipeline (1), the first gas inlet (11) and the first gas outlet are arranged at the two ends of the first pipeline (1), and the pressure-reducing heat exchange device (2) is arranged at one end of the first pipeline (1) close to the first gas inlet (11). The first pipeline assembly further comprises a detection assembly (3) arranged in the first pipeline (1), the detection assembly (3) is arranged between the pressure-reducing heat exchange device (2) and the first gas outlet, the detection assembly (3) comprises a detection member and a control member, the detection member is used for detecting the flow of the first natural gas in the first pipeline (1), and the control member is used for controlling the flow of the first natural gas in the first pipeline (1).

8. The pressure reduction heat exchange system for natural gas according to claim 1, wherein The second pipeline assembly comprises a second pipeline (5), the second gas inlet (51) and the second gas outlet are respectively located at two ends of the second pipeline (5), and the third heat exchange part (53) is arranged in the second pipeline (5).

9. The pressure reduction heat exchange system for natural gas according to claim 8, wherein The third heat exchange part (53) is formed by bending part of the second pipeline (5), and the third heat exchange part (53) is in a wave shape.

10. The pressure reduction heat exchange system for natural gas according to claim 8, wherein The second gas inlet (51) is connected with the third pipeline (7) and is located at one end of the third pipeline (7) close to a third gas inlet (71) of the third pipeline (7), the third gas inlet (71) is used for receiving the second natural gas, the fourth gas outlet (61) of the collecting pipeline (6) is connected with the third pipeline (7) and is located at one end of the third pipeline (7) close to a third gas outlet (72) of the third pipeline (7).

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