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English to Chinese: Emission Reduction Measure (减排措施) General field: Tech/Engineering
Source text - English Source Category : Mineral Products - Stone Quarrying & Processing
Emission Reduction Measure Name ：Fabric Filter
Control Efficiency (%)： 99 (PM10 mainly)
Cost Effectiveness (2006$/ton)** : $147-$186 per ton PM10
A fabric filter, or baghouse, consists of a number of fabric bags placed in parallel inside of an enclosure. Particulate matter is collected on the surface of the bags as the gas stream passes through them. The particulate is periodically removed from the bags and collected in hoppers located beneath the bags. A number of methods are employed to facilitate the removal of particulate from the bags, including shaking, reverse air flow, and pulse air flow. The only potential drawback to a fabric filter would be when used in conjunction with a high moisture flue gas stream or with extremely high temperatures. If moisture levels in the flue gas stream are too high then filter caking can occur. Cost-effectiveness varies depending on the type of filter (Reverse-Air Cleaned Type, Mech. Shaker Type, Pulse Jet Type) and is based on EPA’s cost-estimating spreadsheet for fabric filters. This control applies to stone quarrying and processing operations. Nonmetallic Mineral Processing (305020) - ore crushing, grinding, and screening, and Calciners (SCC 305150) and Dryers (SCC 30502012) are considered in this category. Materials handling operations including crushing, grinding, and screening, can produce significant PM emissions.
English to Chinese: UVB System (UVB 系统) General field: Tech/Engineering
Source text - English The UVB System consists of a specially designed well, a negative-pressure stripping reactor located in an
air-tight, subsurface vault, an above-ground mounted blower, and an above-ground waste air decontamination system (Figure 2).
· A UVB well has at least two screened sections that are separated by solid casing. The lower screen is
separated from the upper screen by a fixed or inflatable packer. The water level rises inside the well due to negative pressure generated by a blower applied to the air-tight vault. Through a pipe connected to the negative-pressure stripping reactor located within the vault, ambient air is drawn into the well, and
the rising air bubbles act as an air-lift pump to enhance the suction effect at the well bottom. Thus,
water is continually drawn into the well screen located at the bottom of the contaminated zone.
· The water is drawn to a stripping reactor above the water table, where VOCs are removed. As a result of the concentration gradient, contaminants vaporize into the air bubbles and are removed from the well by the air flow.
· After the vapor-phase separation, the cleaned groundwater is channeled through a pipe extending from the bottom of the stripper reactor through a packer separating the two screened intervals.
· A submersible pump may be added to the UVB System, to induce a specific flow direction, producing, either an upward or a downward component to the vertical flow of groundwater within the well.
Translation - Chinese UVB系统由一个专门设计的地下水修复井，一个位于密封的地下窖中的负压气提反应器，一个安装在地面的鼓风机，和一个地面废气净化系统组成（图 2）。
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