Refined heavy-hydrocarbon removal system for recovering LNG/LPG/NGL from petroleum associated gas

A technology for petroleum associated gas and associated gas, which is used in the petroleum industry, recovery of liquid hydrocarbon mixtures, and gas fuels. , high precision effect

Active Publication Date: 2015-06-24
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this process technology is relatively lacking in application performance and experience in the world. The production of LNG products has strict requirements on the content of heavy hydrocarbons. When the content of heavy hydrocarbons exceeds a certain limit, it will freeze and block the cold at -160°C Tanks and valve pipelines make it difficult for the ultra-low temperature system to operate stably
At present, there are few similar experiences that can be used for reference, and there is still a blank in this field in China

Method used

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  • Refined heavy-hydrocarbon removal system for recovering LNG/LPG/NGL from petroleum associated gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, a heavy hydrocarbon refining system for recovering LNG / LPG / NGL from petroleum associated gas includes raw material associated gas inlet pipeline 1, LPG cold box 11, low temperature separator 12, and heavy hydrocarbon refining absorption tower 13. The interior of the LPG cold box 11 is divided into five independent parts from top to bottom: the upper box 111, the upper middle box 112, the middle box 113, the lower middle box 114, and the lower box 115. The gas pipeline 1 is connected to the inlet of the lower box 115, the outlet of the lower box 115 is connected to the lower inlet of the absorption tower 13 for refining and removing heavy hydrocarbons through the primary cooling associated gas pipeline 2, and the bottom of the absorption tower 13 for removing heavy hydrocarbons is The outlet is connected with the liquid phase pipeline 7 at the bottom of the tower, the outlet at the top of the absorption tower 13 is connected with the inlet of t...

Embodiment 2

[0026] On the basis of Example 1, such as figure 1 As shown, the inlet of the upper tank 111 is connected with a normal temperature primary refrigerant pipeline 15, the outlet of the upper tank 111 is connected with a low temperature primary refrigerant pipeline 16, and the inlet of the upper and middle tank 112 is connected with a low temperature The low-pressure first-stage refrigerant pipeline 17 and the outlet of the upper and middle tanks 112 are connected with a normal temperature and low-pressure first-stage refrigerant pipeline 18, and the low-temperature and low-pressure first-stage refrigerant pipeline 16 is connected to the low-temperature and low-pressure first-stage refrigerant pipeline 17. The normal temperature first-stage refrigerant enters the upper box 111 of the LPG cold box 11 through the normal temperature first-stage refrigerant pipeline 15, and the cooled low-temperature first-stage refrigerant passes through the regulating valve 19 on the low-temperature...

Embodiment 3

[0028] On the basis of Example 1, in order that the liquid separated by the low temperature separator 12 can quickly enter the upper part of the refined heavy hydrocarbon packed absorption tower 13, so the separated low temperature condensate absorbent pipeline 5 is respectively connected in parallel with two Absorbent booster pump 14, two absorbent booster pumps 14 simultaneously pump the liquid-phase low-temperature separation condensate to the packed absorption tower 13 for fine removal of heavy hydrocarbons, and the liquid-phase low-temperature separation The condensate flow rate is relatively large, and the reverse contact surface with the upward airflow in the tower is relatively large, so there will be more heavy hydrocarbons in the absorption airflow.

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Abstract

The invention provides a refined heavy-hydrocarbon removal system for recovering LNG/LPG/NGL from petroleum associated gas, which comprises a raw material associated gas inlet pipeline, an LPG cold box, a low-temperature separator and a refined removed heavy hydrocarbon absorption tower, wherein an outlet of a lower box of the LPG cold box is connected with the refined removed heavy hydrocarbon absorption tower by a pipeline, an outlet at the bottom of the refined removed heavy hydrocarbon absorption tower is connected with a tower-bottom liquid phase pipeline, an outlet at the top of the refined removed heavy hydrocarbon absorption tower is connected with a lower middle box of the LPG cold box by a pipeline, the lower middle box is connected with the low-temperature separator by a pipeline, the bottom of the low-temperature separator is connected with an absorbent booster pump by a pipeline, and the absorbent booster pump is connected with the refined removed heavy hydrocarbon absorption tower by a pipeline. By using the characteristic that the equilibrium constants of hydrocarbon substances at different temperatures and consisting of different components are different, the system dilutes the heavy hydrocarbon content of associated gas, thereby achieving the purpose of reducing the heavy hydrocarbon content of dry gas; the temperature of associated gas is reduced two times by using the cold box so as to meet different temperature requirements of absorption and separation; and due to the adoption of the absorption tower, the precision of heavy hydrocarbon removal is improved.

Description

technical field [0001] The invention belongs to the petroleum field, and in particular relates to a system for refining and removing heavy hydrocarbons used for recovering LNG / LPG / NGL from petroleum associated gas. Background technique [0002] Associated gas is oil associated gas in oilfields, which is the volatile part of crude oil. It is a petroleum-based flammable gas. It is a high-quality fuel and chemical raw material. [0003] In the past, due to the scattered and small amount of associated gas, the complex treatment process and high investment, most of them were treated directly or burned, which not only polluted the environment, but also wasted resources. At the same time, there were potential safety hazards. emissions, low-carbon economy and green development are inconsistent. [0004] Associated gas has high economic value. After the associated gas is treated, the recoverable economic products include: LPG (liquefied petroleum gas), NGL (stable light hydrocarbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G5/06
CPCC10G5/04C10G5/06C10G2300/1025C10G2400/26C10L3/10C10L3/12
Inventor 刘子兵薛岗李亚萍杨充葛涛李京子
Owner XIAN CHANGQING TECH ENG
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