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北京石油化工学院2026年研究生招生接收调剂公告
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whm0827

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[求助] 请高手帮忙翻译一下

The initial and periodic determination of enclosure background emissions shall be conducted according to the procedures specified in §86.117-90(a)(1) through (a)(6). The enclosure shall be maintained at a nominal temperature of 105.0oF throughout the four-hour period. Variable volume enclosures may be operated either in the latched volume configuration, or with the variable volume feature active. Fixed volume enclosures shall be operated with inlet and outlet flow streams closed. The allowable enclosure background emissions of HC and/or methanol as calculated according to 40 CFR §86.117-90(a)(7) shall not be greater than 0.05 grams in 4 hours. The enclosure may be sealed and the mixing fan operated for a period of up to 12 hours before the initial HC concentration reading (CHCi) and the initial methanol concentration reading (CCH3OHi) is taken and the four-hour background measurement period begins.

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reko34

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RXMCDM: 金币+1, 多谢应助! 2014-06-18 19:03:07
whm0827: 金币+20, 翻译EPI+1, ★★★★★最佳答案 2014-06-19 08:33:54
根据§86.117-90(a)(1)至(a)(6)规定的流程进行背景排放的初始和阶段性测量。整个4小时阶段,箱体保持105.0oF的额定温度。可变体积的箱体可作为固定体积配置或可变体积功能进行操作。固定体积箱体操作时进排气关闭。4小时的许可HC和/或甲烷背景排放根据40 CFR §86.117-90(a)(7)的计算不能大于0.05克。可以封闭箱体,运行混合风扇最多12小时,直到获得初始的HC浓度指数(CHCi)和甲烷浓度指数(CCH3OHi),随后开始4小时背景测量阶段。
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