液化天然气

采用集成工艺，减少排放，提高渗透液回收率。

本文描述了运营商为减少温室气体排放和回收更多碳氢化合物，并通过统一的方法将其货币化为销售天然气而采取的举措。

图 1'AGRU 中的初级膜。
图 1'AGRU 中的初级膜。
来源：SPE 225131。

本文介绍了运营商的零成本解决方案，该方案通过减少总渗透流、发电和外购电力中的温室气体 (GHG)排放量 30%；并通过将马来西​​亚某天然气终端酸性气体脱除装置 (AGRU) 中渗透流回收的碳氢化合物货币化，每年增加超过 2000 万美元的收入。

介绍

海上上游天然气供应商将其产品输送到多个陆上接收终端，在那里进行处理和混合，以满足各项规格要求，特别是天然气处理厂 (GPP) 交付点的最大二氧化碳摩尔百分比要求。在某条天然气供应链中，如果二氧化碳浓度超过GPP 要求，则该天然气会在配备膜基 AGRU 系统的终端进行处理，该系统旨在降低销售天然气中的二氧化碳浓度。

AGRU 设计

来自海上上游供应商的原料气首先被送至预处理装置。AGRU 配备有两级气体处理装置，分别采用一级膜和二级膜。经一级膜处理并符合规格的气体在被送至 GPP 之前，由销售气体压缩机 (SGC) 进行压缩。来自一级膜的副产品流，即渗透液，其中仍含有高浓度的有价烃，随后由增压气体压缩机 (BGC) 送至二级膜，以进一步回收烃类（图 1）。

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LNG

Emissions Reduced, Recovery Enhanced From Permeate Stream Using Integrated Process

This paper describes the operator’s initiative to reduce greenhouse-gas emissions and recover additional hydrocarbon, monetizing it as sales gas, by integrating upstream and downstream gas facilities in a unified approach.

Fig. 1—Primary membrane in AGRU.
Fig. 1—Primary membrane in AGRU.
Source: SPE 225131.

This paper describes the operator’s zero-cost solutions to reduce greenhouse gas (GHG) emissions by 30% from the total permeate stream, power generation, and purchased electricity; and to add more than $20 million of revenue annually through monetization of recovered hydrocarbon from permeate streams in the acid-gas-removal unit (AGRU) at one of its natural gas terminals in Malaysia.

Introduction

Offshore upstream natural-gas suppliers transport their production to multiple onshore receiving terminals, where it is treated and blended to meet required specifications, particularly the maximum CO2 mol% at the gas-processing-plant (GPP) delivery point. In one of the natural-gas supply chains, where the CO2 concentration exceeds GPP requirements, the gas is processed at a terminal equipped with a membrane-based AGRU system, which is designed to reduce CO2 concentration in sales gas.

AGRU Design

Feed gas from offshore upstream suppliers is first directed to the pretreatment unit. The AGRU is equipped for two stages of gas processing with its primary and secondary membranes. The treated, on-spec gas leaving the primary membrane is compressed by the sales-gas compressor (SGC) before being exported to the GPP. The byproduct stream from the primary membrane, known as the permeate, which still contains a high concentration of valuable hydrocarbons, is then sent to the secondary membrane by a booster-gas compressor (BGC) for further hydrocarbon recovery (Fig.

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