Temperature returning device and method of light hydrocarbon deep recovery system

Abstract

The invention provides a temperature returning device and method of a light hydrocarbon deep recovery system, the temperature returning device comprises a temperature returning assembly, and the light hydrocarbon deep recovery system is provided with a temperature returning assembly; an inlet of the temperature returning assembly is connected with an outlet of an output natural gas compressor on the light hydrocarbon deep recovery system, and an outlet of the temperature returning assembly is connected with an inlet of a component to be subjected to temperature returning in the light hydrocarbon deep recovery system; the device can solve the problem of difficulty in temperature return of a light hydrocarbon deep recovery device, so that natural gas is not emptied in the temperature return process, air pollution is avoided, and the effects of large temperature return gas amount, high temperature return speed and high temperature return temperature are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas field development, and particularly relates to a temperature-raising device and method for a light hydrocarbon deep recovery system. Background Art

[0002] When the light hydrocarbon deep recovery device is shut down for maintenance, due to the low temperature of the low-temperature tower, packing, equipment, and pipelines, a large amount of low-temperature liquid hydrocarbons that are not easily volatilized accumulate at the low points. To accelerate the nitrogen replacement effect and speed before device maintenance, and at the same time prevent freezing blockage and frostbite of workers during the maintenance of the low-temperature light hydrocarbon recovery device, it is necessary to heat and raise the temperature of the containers, equipment, and pipelines before maintenance, and forcibly accelerate the volatilization of the low-temperature liquid hydrocarbons to ensure the safety of the maintenance process and shorten the nitrogen replacement time. The traditional temperature-raising methods are divided into natural temperature-raising and forced temperature-raising. Generally, small-scale treatment devices use natural temperature-raising. Due to reasons such as large tower, a large number of internal packings, large pipeline diameter, and long pipeline distance in large-scale treatment devices, forced temperature-raising methods are mostly used to save the time-consuming of the temperature-raising operation during maintenance.

[0003] Since there is no fixed temperature-raising process for the light hydrocarbon recovery device, the current temperature-raising processes of most oil and gas field light hydrocarbon recovery devices are to heat the dehydrated raw material gas with heat-conducting oil and then introduce it into the low-temperature light hydrocarbon recovery device for purging, while purging and venting at the same time, so as to achieve the purpose of raising the temperature of the low-temperature light hydrocarbon recovery device, thereby heating and volatilizing the accumulated low-temperature liquid hydrocarbons in the light hydrocarbon recovery device. However, this temperature-raising method will cause a large amount of natural gas to be wasted by venting and environmental pollution. When the temperature-raising device uses heat-conducting oil as the heating medium to heat the raw material gas, due to the method of purging and venting at the same time, in order to improve the temperature-raising effect, it is necessary to control the gas volume of the raw material gas. When the gas volume is large, the temperature is not easily reached the target temperature value, and the vented natural gas volume is even larger; while a smaller gas volume will cause the heating temperature of the raw material gas to be not easily controlled, increasing the operation risk (the cold box requires that the medium temperature does not exceed 60 degrees Celsius). Therefore, only intermittent temperature increase can be carried out, resulting in a very slow temperature-raising speed, poor temperature-raising effect, and long time. Summary of the Invention

[0004] The purpose of the present invention is to provide a temperature-raising device and method for a light hydrocarbon deep recovery system, which solves the defects of poor temperature-raising effect and long time existing in the existing temperature-raising methods of light hydrocarbon deep recovery devices.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A temperature-raising device for a light hydrocarbon deep recovery system provided by the present invention includes a temperature-raising assembly. Among them, the light hydrocarbon deep recovery system is configured with one temperature-raising assembly;

[0007] The inlet of the temperature-raising component is connected to the outlet of the external gas compressor in the light hydrocarbon deep recovery system, and the outlet of the temperature-raising component is connected to the inlet of the component to be temperature-raised in the light hydrocarbon deep recovery system.

[0008] Preferably, the component to be temperature-raised in the light hydrocarbon deep recovery system includes a mercury removal and dehydration device and a light hydrocarbon deep recovery device. Among them, the outlet of the temperature-raising component is sequentially connected to the mercury removal and dehydration device and the light hydrocarbon deep recovery device.

[0009] Preferably, the temperature-raising component includes an external gas compressor outlet pipeline and a regenerated gas compressor inlet pipeline. Among them, the inlet of the external gas compressor outlet pipeline is connected to the external gas outlet in the light hydrocarbon deep recovery system, and the outlet of the external gas compressor outlet pipeline is connected to the inlet of the mercury removal and dehydration device through the regenerated gas compressor inlet pipeline.

[0010] Preferably, the regenerated gas compressor inlet pipeline is connected to the inlet of the regenerated gas compressor in the mercury removal and dehydration device.

[0011] Preferably, a flow regulating valve group is arranged on the regenerated gas compressor inlet pipeline.

[0012] Preferably, the inlet of the temperature-raising component is connected to the outlet of the external gas compressor in the light hydrocarbon deep recovery system.

[0013] A temperature-raising method for a light hydrocarbon deep recovery device includes the following steps:

[0014] First, adjust the pressure in the light hydrocarbon deep recovery system to a preset range value;

[0015] Second, input the external gas output from the light hydrocarbon deep recovery system into the temperature-raising component, and adjust the pressure value of the gas at the outlet of the temperature-raising component to within the preset range;

[0016] Finally, lead the gas at the outlet of the temperature-raising component to the inlet of the component to be temperature-raised in the light hydrocarbon deep recovery system to realize the temperature-raising treatment of the light hydrocarbon deep recovery system.

[0017] Preferably, the method of adjusting the pressure in the light hydrocarbon deep recovery system to a preset range value is as follows:

[0018] Use the vent valve set at the inlet of the cold box in the light hydrocarbon deep recovery device to reduce the pressure in the light hydrocarbon deep recovery system to 4.2 MPa - 4.5 MPa, and the inlet temperature of the cold box in the light hydrocarbon deep recovery device is greater than or equal to minus 10 degrees Celsius;

[0019] Gradually open the J-T valve, increase the pressure of the DHX tower and the deethanizer tower, and use the vent valve set at the top of the DHX tower in the light hydrocarbon deep recovery unit to reduce the pressure in the light hydrocarbon deep recovery system to 3.6 MPa - 3.8 MPa, then close the J-T valve.

[0020] Preferably, use a regeneration gas compressor to boost the pressure value of the natural gas at the outlet of the temperature recovery component to 4.0 MPa - 4.2 MPa.

[0021] Preferably, during the temperature recovery process, if the pressure in the light hydrocarbon deep recovery system is insufficient, use the natural gas at the inlet of the light hydrocarbon deep recovery system to pressurize the light hydrocarbon deep recovery system so that the pressure of the light hydrocarbon deep recovery system meets 3.6 MPa - 3.8 MPa.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The temperature recovery device of a light hydrocarbon deep recovery system provided by the present invention uses a temperature recovery component to transport the natural gas in the system to enter a mercury removal and dehydration device for dehydration and heating. The heated natural gas enters the light hydrocarbon deep recovery device through the discharge valve of the mercury removal and dehydration device to recover the temperature of each part of the low-temperature system, and then is input into an external transmission natural gas compressor, finally forming a closed-loop temperature recovery process to complete the temperature recovery of the light hydrocarbon deep recovery system. This device can solve the problem of difficult temperature recovery of the light hydrocarbon deep recovery device, realize that natural gas is not vented during the temperature recovery process, avoid air pollution, and achieve the effects of a large amount of temperature recovery gas, a fast temperature recovery speed, and a high temperature recovery temperature; the present invention can shorten the temperature recovery time before the maintenance of the light hydrocarbon deep recovery device by more than 1 time, shorten the device maintenance time by nearly 1 day, and reduce the natural gas venting volume by more than 1 million cubic meters. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a temperature recovery device of a light hydrocarbon deep recovery system provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of a temperature recovery device of a light hydrocarbon deep recovery system provided by another embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a mercury removal and dehydration device of a temperature recovery device of a light hydrocarbon deep recovery system provided by an embodiment of the present invention;

[0027] Among them, 11(21) is a pigging device; 12(22) is a separation and metering area; 13(23) is a mercury and water removal device; 14(24) is a light hydrocarbon deep recovery device; 15(25) is an exported natural gas compressor; 16(26) is a temperature recovery component; 131 is a raw material separator; 132 is a raw material gas filter separator; 133 is a mercury removal tower; 134 is a mercury removal agent dust filter; 135 is a molecular sieve dehydration and regeneration device; 1351 is a first molecular sieve tower; 1352 is a second molecular sieve tower; 1353 is a third molecular sieve tower; 1354 is a regeneration gas heater; 1355 is a regeneration gas heat exchanger; 1356 is a regeneration gas air cooler; 1357 is a regeneration gas separator; 1358(2358) is a regeneration gas compressor; 1359(2359) is a flow regulating valve group; 141(241) is a cold box; 142(242) is a low-temperature separator; 143(243) is an expander; 144(244) is a DHX tower; 145(245) is a deethanizer; 146(246) is an inlet vent valve; 161(261) is an exported natural gas compressor outlet pipeline; 162(262) is a regeneration gas compressor inlet pipeline. Detailed implementation manners

[0028] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0029] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0030] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0032] In addition, in the description of the specification and the appended claims of the present application, the terms "first", "second", "third", etc. are only used for differential description and should not be construed as indicating or implying relative importance.

[0033] The reference to "one embodiment" or "some embodiments" in the description of the present application means that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0034] Embodiment 1

[0035] Refer to the appendix Figure 1 A temperature-raising device for a light hydrocarbon deep recovery system provided in this embodiment includes a temperature-raising assembly. Among them, the light hydrocarbon deep recovery system is configured with one temperature-raising assembly;

[0036] The inlet of the temperature-raising assembly is connected to the external transmission natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the temperature-raising assembly is connected to the inlet of the component to be temperature-raised in the light hydrocarbon deep recovery system.

[0037] Embodiment 2

[0038] A temperature-raising device for a light hydrocarbon deep recovery system provided in this embodiment includes a temperature-raising assembly. Among them, the light hydrocarbon deep recovery system is configured with one temperature-raising assembly;

[0039] The inlet of the temperature-raising assembly is connected to the external transmission natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the temperature-raising assembly is connected to the inlet of the component to be temperature-raised in the light hydrocarbon deep recovery system.

[0040] The light hydrocarbon deep recovery system includes a pigging device 11, a separation and metering area 12, a mercury removal and dehydration device 13, a light hydrocarbon deep recovery device 14, an external transmission natural gas compressor 15, and an external transmission downstream pipeline network connected in sequence.

[0041] A bypass is provided at the outlet of the external transmission natural gas compressor 15. The inlet of the temperature-raising assembly is connected to this bypass, and the outlet of the temperature-raising assembly is connected to the inlet of the mercury removal and dehydration device 13.

[0042] Embodiment 3

[0043] A temperature recovery device for a light hydrocarbon deep recovery system provided in this embodiment includes a temperature recovery component. Among them, the light hydrocarbon deep recovery system is configured with one temperature recovery component;

[0044] The inlet of the temperature recovery component is connected to the external gas export on the light hydrocarbon deep recovery system, and the outlet of the temperature recovery component is connected to the inlet of the component to be temperature recovered in the light hydrocarbon deep recovery system.

[0045] The light hydrocarbon deep recovery system includes a pigging device 11, a separation and metering area 12, a mercury removal and dehydration device 13, a light hydrocarbon deep recovery device 14, an external gas compressor 15, and an external downstream pipe network connected in sequence.

[0046] A bypass is provided at the outlet of the external gas compressor 15. The inlet of the temperature recovery component is connected to this bypass, and the outlet of the temperature recovery component is connected to the inlet of the mercury removal and dehydration device 13.

[0047] The temperature recovery component 16 includes an external gas compressor outlet pipeline 161 and a regenerated gas compressor inlet pipeline 162. Among them, the external gas compressor outlet pipeline 161 is connected to this bypass, and the external gas compressor outlet pipeline 161 is connected to the inlet of the mercury removal and dehydration device 13 through the regenerated gas compressor inlet pipeline 162.

[0048] Embodiment 4

[0049] A temperature recovery device for a light hydrocarbon deep recovery system provided in this embodiment includes a temperature recovery component. Among them, the light hydrocarbon deep recovery system is configured with one temperature recovery component;

[0050] The inlet of the temperature recovery component is connected to the external gas export on the light hydrocarbon deep recovery system, and the outlet of the temperature recovery component is connected to the inlet of the component to be temperature recovered in the light hydrocarbon deep recovery system.

[0051] The light hydrocarbon deep recovery system includes a pigging device 11, a separation and metering area 12, a mercury removal and dehydration device 13, a light hydrocarbon deep recovery device 14, an external gas compressor 15, and an external downstream pipe network connected in sequence.

[0052] A bypass is provided at the outlet of the external gas compressor 15. The inlet of the temperature recovery component is connected to this bypass, and the outlet of the temperature recovery component is connected to the inlet of the mercury removal and dehydration device 13.

[0053] As Figure 3 shown, the mercury removal and dehydration device 13 at least includes a raw material separator 131, a raw material gas filter separator 132, a mercury removal tower 133, a mercury removal agent dust filter 134, and a molecular sieve dehydration and regeneration device 135 connected in sequence.

[0054] The molecular sieve dehydration and regeneration device 135 includes a molecular sieve tower, a regeneration gas heater 1354, a regeneration gas heat exchanger 1355, a regeneration gas air cooler 1356, a regeneration gas separator 1357, and a regeneration gas compressor 1358 that are connected in sequence.

[0055] The molecular sieve tower includes a first molecular sieve tower 1351, a second molecular sieve tower 1352, and a third molecular sieve tower 1353. Natural gas can be dehydrated through one of the first molecular sieve tower 1351, the second molecular sieve tower 1352, and the third molecular sieve tower 1353, which can improve the efficiency of dehydration treatment.

[0056] The working process of the mercury removal and dehydration device in this embodiment:

[0057] Natural gas enters the molecular sieve dehydration and regeneration device 135 after being pretreated by a raw material separator 131, a raw material gas filter separator 132, a mercury removal tower 133, and a mercury removal agent dust filter 134. Among them, the regeneration gas heater 1354 and the regeneration gas air cooler 1356 are used to adjust the temperature of the warmed natural gas. The natural gas is dehydrated through the molecular sieve tower and then enters the regeneration gas heater 1354 for heating up. The regeneration gas heater 1354 is also connected with a heat source inlet pipeline and a heat source outlet pipeline. The heat source can be heat-conducting oil. The heat-conducting oil completes the heating of the natural gas through the heat source inlet pipeline, the regeneration gas heater, and the heat source outlet pipeline. The natural gas enters the light hydrocarbon deep recovery device through the regeneration gas heat exchanger 1355 and the outlet valve.

[0058] Embodiment 5

[0059] A temperature warming device for a light hydrocarbon deep recovery system provided in this embodiment includes a temperature warming assembly. Among them, the light hydrocarbon deep recovery system is configured with one temperature warming assembly;

[0060] The inlet of the temperature warming assembly is connected to the external transmission natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the temperature warming assembly is connected to the inlet of the component to be temperature warmed in the light hydrocarbon deep recovery system.

[0061] The light hydrocarbon deep recovery system includes a pigging device 11, a separation and metering area 12, a mercury removal and dehydration device 13, a light hydrocarbon deep recovery device 14, an external transmission natural gas compressor 15, and an external transmission downstream pipe network that are connected in sequence.

[0062] A bypass is provided at the outlet of the external transmission natural gas compressor 15. The inlet of the temperature warming assembly is connected to this bypass, and the outlet of the temperature warming assembly is connected to the inlet of the mercury removal and dehydration device 13.

[0063] The light hydrocarbon deep recovery device 14 at least includes a cold box 141, a low-temperature separator 142, an expander 143, a DHX column 144 and a deethanizer 145. Among them, the outlet of the cold box 141 is connected to the inlet of the low-temperature separator 142. The top outlet of the low-temperature separator 142 is divided into two paths. One path is connected to the inlet of the expander 143, and the other path is connected to the inlet of the DHX column 144. The expander 143 is also connected to the inlet of the DHX column 144. The top outlet of the DHX column 144 is connected to the inlet of the expander 143. The bottom outlet of the DHX column 144 is connected to the inlet of the deethanizer 145 through the cold box 141. The bottom outlet of the low-temperature separator 142 is connected to the inlet of the deethanizer 145 through the cold box 141. The outlet of the deethanizer 145 is connected to the inlet of the DHX column 144 through the cold box 141.

[0064] An inlet vent valve 146 is provided at the inlet of the cold box 141.

[0065] A J-T valve 147 is provided at the inlet of the DHX column 144.

[0066] Example 6

[0067] A method for warming up a light hydrocarbon deep recovery device proposed in this embodiment includes the following steps:

[0068] After the light hydrocarbon deep recovery system is shut down, first, the pressure of the mercury removal and dehydration device 13 and the low-temperature system of the light hydrocarbon deep recovery device 14 is reduced to 4.2 MPa - 4.5 MPa through the inlet vent valve 146 of the light hydrocarbon deep recovery device, and it should be noted that the inlet temperature of the cold box 141 shall not be lower than -10 °C.

[0069] Secondly, gradually open the J-T valve 147 to increase the pressure of the DHX column 144 and the deethanizer 145. Adjust the pressure of the whole system to 3.6 MPa - 3.8 MPa through the top vent valve of the DHX column 144, and then close the J-T valve 147.

[0070] Then, ensure that the processes of the mercury removal and dehydration device 13, the light hydrocarbon deep recovery device 14 and the exported natural gas compressor 15 are unblocked.

[0071] Finally, start the regeneration gas compressor 1358 to establish the warming-up cycle of the light hydrocarbon deep recovery system. The specific cycle process is as follows:

[0072] The natural gas in the system enters the regeneration gas compressor 1358 through the discharge valve at the outlet of the external transmission natural gas compressor 15, via the external transmission natural gas compressor outlet pipeline 161 and the regeneration gas compressor inlet pipeline 162. The natural gas is boosted to 4.0 MPa - 4.2 MPa by the regeneration gas compressor 1358. The circulation volume is adjusted to 36,000 Nm3 / hour - 38,000 Nm3 / hour through the pipeline at the outlet of the regeneration gas compressor and the outlet regulating valve at the outlet. Subsequently, it enters the mercury removal and dehydration unit 13 for dehydration and heating. The heated natural gas enters the light hydrocarbon deep recovery unit through the discharge valve of the mercury removal and dehydration unit 13 to warm up each part of the low-temperature system. After the natural gas is warmed up through the cold box 141, the low-temperature separator 142, the expander 143, the DHX tower 144, and the deethanizer 145, it passes through the external transmission natural gas compressor 15, via the external transmission natural gas compressor outlet pipeline 161 and the regeneration gas compressor inlet pipeline 162, and enters the regeneration gas compressor 1358, finally forming a closed-loop warming process to complete the warming of the light hydrocarbon deep recovery system.

[0073] During the warming process, if the system pressure is insufficient, the system can be pressurized through the front-end natural gas feed valve 111 of the pigging device 11 and the natural gas feed valve 121 after the separation and metering area 1212 to maintain the system within the range of 3.6 MPa - 3.8 MPa.

[0074] In this cyclic warming process, adjust the heat source flow of the regeneration gas heater 1354 to control the temperature of the inlet of the regeneration gas air cooler 1356 not to exceed 100 °C. Adjust the regeneration gas air cooler 1356 to control the inlet temperature of the regeneration gas compressor 1358 within the range of 55 °C - 60 °C, so as to control the outlet temperature of the regeneration gas compressor 1358 within the range of 60 °C - 70 °C.

[0075] Example 7

[0076] As Figure 2 shown, a warming device for a light hydrocarbon deep recovery system provided in this embodiment, the light hydrocarbon deep recovery system is provided with two columns, and each column of the light hydrocarbon deep recovery system is configured with a warming component;

[0077] The inlet of the warming component is connected to the external transmission natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the warming component is connected to the inlet of the component to be warmed in the light hydrocarbon deep recovery system.

[0078] The two columns of the light hydrocarbon deep recovery systems are connected through the communication component 3.

[0079] Example 8

[0080] A warming device for a light hydrocarbon deep recovery system provided in this embodiment, the light hydrocarbon deep recovery system is provided with two columns, and each column of the light hydrocarbon deep recovery system is configured with a warming component;

[0081] The inlet of the temperature recovery component is connected to the exported natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the temperature recovery component is connected to the inlet of the component to be temperature recovered in the light hydrocarbon deep recovery system.

[0082] Two light hydrocarbon deep recovery systems are connected by a connection component 3.

[0083] The connection component 3 includes a connection pipeline 31, and both ends of the connection pipeline 31 are respectively installed between the light hydrocarbon deep recovery device and the exported natural gas compressor in two light hydrocarbon deep recovery systems.

[0084] A valve 32 is arranged on the connection pipeline 31.

[0085] The working process of this embodiment:

[0086] The two light hydrocarbon deep recovery systems can be connected by the connection component 3. The two light hydrocarbon deep recovery systems can be the first light hydrocarbon deep recovery system 1 and the second light hydrocarbon deep recovery system 2. The first light hydrocarbon deep recovery system 1 forms a closed-loop temperature recovery process. After the natural gas of the second light hydrocarbon deep recovery system 2 is temperature recovered by the light hydrocarbon deep recovery device 24, it can enter the exported natural gas compressor 15 of the first light hydrocarbon deep recovery system through the connection component 3, and finally enter the temperature recovery system 26 of the second light hydrocarbon deep recovery system 2 through the temperature recovery connection pipeline, forming a whole closed-loop temperature recovery process to complete the temperature recovery of the second light hydrocarbon deep recovery system.

[0087] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A temperature recovery device for a light hydrocarbon deep recovery system, It is characterized in that It includes a temperature recovery component, wherein the light hydrocarbon deep recovery system is equipped with a temperature recovery component; The inlet of the temperature recovery component is connected to the outlet of the external natural gas compressor on the light hydrocarbon deep recovery system, and the outlet of the temperature recovery component is connected to the inlet of the component to be temperature recovered in the light hydrocarbon deep recovery system.

2. A temperature recovery device for a light hydrocarbon deep recovery system according to claim 1, It is characterized in that The components to be reheated in the light hydrocarbon deep recovery system include a mercury removal and dehydration device (13) and a light hydrocarbon deep recovery device (14), wherein the outlet of the reheat component is sequentially connected to the mercury removal and dehydration device (13) and the light hydrocarbon deep recovery device (14).

3. A temperature recovery device for a light hydrocarbon deep recovery system according to claim 2, It is characterized in that The temperature recovery component comprises an export natural gas compressor outlet pipeline (161) and a regeneration gas compressor inlet pipeline (162), wherein the inlet of the export natural gas compressor outlet pipeline (161) is connected to the export natural gas outlet on the light hydrocarbon deep recovery system, and the outlet of the export natural gas compressor outlet pipeline (161) is connected to the inlet of the mercury removal and dehydration device (13) through the regeneration gas compressor inlet pipeline (162).

4. A temperature recovery device for a light hydrocarbon deep recovery system according to claim 3, It is characterized in that The regeneration gas compressor inlet pipeline (162) is connected to the inlet of the regeneration gas compressor (1358) in the mercury removal and dehydration device (13).

5. The temperature recovery device of the light hydrocarbon deep recovery system according to claim 3, It is characterized in that The regeneration gas compressor inlet pipeline (162) is provided with a flow regulating valve group.

6. The temperature recovery device of the light hydrocarbon deep recovery system according to claim 1, It is characterized in that The inlet of the temperature recovery component is connected to the outlet of the external natural gas compressor (15) in the light hydrocarbon deep recovery system.

7. A temperature recovery method for a light hydrocarbon deep recovery device, It is characterized in that The following steps are involved: First, the pressure in the light hydrocarbon deep recovery system is adjusted to a preset range value; Secondly, the external natural gas output from the light hydrocarbon deep recovery system is input into the temperature recovery component, and the pressure value of the natural gas at the outlet of the temperature recovery component is adjusted to a preset range; Finally, the natural gas at the outlet of the temperature recovery component is led to the inlet of the component to be temperature recovered in the light hydrocarbon deep recovery system, so as to realize the temperature recovery treatment of the light hydrocarbon deep recovery system.

8. A temperature recovery method for a light hydrocarbon deep recovery device according to claim 7, It is characterized in that Adjust the pressure in the light hydrocarbon deep recovery system to the preset range value by: The pressure in the light hydrocarbon deep recovery system is reduced to 4.2MPa-4.5MPa by using the vent valve provided at the inlet of the cold box in the light hydrocarbon deep recovery device, and the inlet temperature of the cold box in the light hydrocarbon deep recovery device is greater than or equal to minus 10 degrees Celsius; The JT valve (147) is gradually opened to increase the pressure of the DHX tower (144) and the deethanizer (145). The pressure in the light hydrocarbon deep recovery system is reduced to 3.6 MPa-3.8 MPa using the vent valve provided at the top of the DHX tower (144) in the light hydrocarbon deep recovery device, and the JT valve (147) is closed.

9. A temperature recovery method for a light hydrocarbon deep recovery device according to claim 7, It is characterized in that A regeneration gas compressor (1358) is used at the outlet of the temperature recovery component to increase the pressure of the natural gas to 4.0MPa-4.2MPa.

10. A temperature recovery method for a light hydrocarbon deep recovery device according to claim 7, It is characterized in that During the warming process, if the pressure in the light hydrocarbon deep recovery system is insufficient, the natural gas at the inlet of the light hydrocarbon deep recovery system is used to pressurize the light hydrocarbon deep recovery system so that the pressure of the light hydrocarbon deep recovery system meets 3.6MPa~3.8MPa.

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