1.1目的本指南涵盖了与天然气生产、加工、传输、储存和配送行业中使用的乙二醇脱水装置相关的现场排放和排放数据的正确收集。 1.2 背景: 1.2.1越来越大的监管压力使得乙二醇脱水装置的静止排气口中的苯、甲苯、乙苯和二甲苯异构体（统称为BTEX）和挥发性有机化合物（VOCs）的排放成为天然气行业的主要问题。1990年的《清洁空气法修正案》（CAAA）推动了空气毒物法规的制定，几个州正在或正在考虑对乙二醇装置的排放进行监管 (1) . 液体和固体废物排放不受《资源保护和回收法》（RCRA）第C子编（危险废物）规定的约束，但未来可能会受到监管 (2) . 1.2.2测量脱水器的废物流对于确定哪些装置的排放量可能高于监管关注水平很重要。由于美国环境保护局（USEPA）或州监管机构尚未制定标准方法，因此使用不同的采样协议和分析技术从各种采样点测量乙二醇脱水装置的空气排放量。液体和固体废物流不存在标准采样方法，因为它们不受RCRA子标题C的约束。缺乏标准协议意味着这种方法的变化可能导致非常不同的排放测量 (3) . 1.2.3为收集现场排放和排放数据提供指导，将使天然气行业能够量化排放，并应用适当的控制措施，以遵守法规。 1.3 总结 --本指南包括几个部分和一个附件。第1节是范围。第2节是术语，定义了天然气行业中与乙二醇脱水装置相关的常用术语。第3节是本指南的意义和使用。第4节是乙二醇脱水装置的工艺说明。第5节讨论了与乙二醇脱水器相关的废物流。第6节介绍了收集空气排放数据的方法，而第7节和第8节分别介绍了收集液体和固体废物排放数据的方法。附录包括本指南中讨论的富/贫乙二醇取样方法的标准操作程序（SOP）。 1.4以英寸-磅或国际单位制表示的数值应单独视为标准。 括号中给出的值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 本指南适用于运营乙二醇脱水装置的任何天然气行业和供应商，需要确定哪些乙二醇装置的排放量可能高于监管水平。 本指南中讨论的排放和排放采样方法不是监管标准。气体研究所制定了标准协议 (3) 和其他气体协会 (4) 和一些州监管机构，如路易斯安那州环境质量部（LDEQ） (5) 和德克萨斯州自然资源保护委员会（TNRCC） (6) 正在接受这些数据。本指南为 不 旨在指导用户如何使用这些协议进行采样，但让用户了解通常与这些废物流采样相关的某些实际注意事项。

1.1 Purpose This guide covers the proper collection of field emission and discharge data associated with glycol dehydration units used in the natural gas production, processing, transmission, storage, and distribution industries. 1.2 Background: 1.2.1 Increasing regulatory pressure has made emissions of benzene, toluene, ethylbenzene, and xylene isomers (collectively known as BTEX) and volatile organic compounds (VOCs) from the still vent of glycol dehydration units a major concern of the natural gas industry. The Clean Air Act Amendments (CAAA) of 1990 have been the impetus for air toxics regulations, and several states are regulating or are considering regulating emissions from glycol units (1) . Liquid and solid waste discharges are exempt from Subtitle C (hazardous waste) regulation under the Resource Conservation and Recovery Act (RCRA), but may be regulated in the future (2) . 1.2.2 Measurement of the waste streams from dehydrators is important to determine which units may have emissions above levels of regulatory concern. Measurements of air emissions from glycol dehydration units have been made from a variety of sampling points using different sampling protocols and analytical techniques since no standard methods have been developed by the United States Environmental Protection Agency (USEPA) or state regulatory agencies. Standard sampling methods do not exist for the liquid and solid waste streams since they are exempt from RCRA Subtitle C. The lack of standard protocols has meant that variations of this approach can result in very different emissions measurements (3) . 1.2.3 Providing guidance on the collection of field emission and discharge data will allow the natural gas industry to quantify emissions and apply appropriate controls to comply with regulations. 1.3 Summary --This guide has several parts and an annex. Section 1 is Scope. Section 2 is Terminology that has definitions of terms commonly used with relation to glycol dehydration units in the natural gas industry. Section 3 is Significance and Use of this guide. Section 4 is a process description of glycol dehydration units. Section 5 is a discussion of the waste streams associated with glycol dehydrators. Section 6 presents the Approaches for Collecting Air Emission Data, while Sections 7 and 8 present the approaches for collecting liquid and solid waste discharge data, respectively. The annex includes a standard operating procedure (SOP) for the rich/lean glycol sampling method discussed in this guide. 1.4 The values stated in either inch-pound or SI units are to be regarded separately as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== This guide on the proper collection of emission and discharge wastes from glycol dehydrators is applicable to any natural gas industry and supplier that operates glycol dehydration units and that needs to identify which glycol units may have emissions above regulatory levels. The emission and discharge sampling methods discussed in this guide are not regulatory standards. Standard protocols have been developed by the Gas Research Institute (3) and other gas associations (4) and some state regulatory agencies such as the Louisiana Department of Environmental Quality (LDEQ) (5) and the Texas Natural Resource Conservation Commission (TNRCC) (6) are accepting these data. This guide is not intended to instruct the user on how to perform the sampling using these protocols, but to make the user aware of certain practical considerations generally associated with sampling these waste streams.