Permanent Total Enclosures (PTEs) are a highly effective way to prevent fugitive process emissions from entering the atmosphere. 完全包围排放源, the process emissions can be minimized and concentrated for more cost effective destruction in a VOC control device. PTEs can be effective for new or pre-existing systems and are used in a wide variety of applications especially when a toxic environment risks the health of your employees.
永久总外壳(PTE’s) Design Criteria – EPA Method 204
A 永久总外壳(PTE) surrounds a production device to capture up to 100% of fugitive air pollutants within the enclosure. 一个附件可能符合以下标准的PTE:
Areas of openings: The total area for all natural draft openings shall not exceed 5% of the surface area of the enclosure’s four walls, 地板和天花板.
Flow rate into enclosure: The average facial velocity (FV) of air through all NDOs shall be at least 3,600m/h (200 ft/min – this equates to a negative pressure difference of 0.007 "水柱). The direction of air flow through all NDOs must be into the enclosure. Access door/windows: All access doors and windows whose areas are not included in item 2 are not included in the calculation in item 4 shall be closed during routine operation of the process. Emission capture: All VOC emissions must be captured and contained for discharge through a control device.
S&SE设计符合EPA规定的减少VOC的要求, state and local authorities VOC emission capture up to 100% with properly designed PTE Targets specific process emissions that must be treated, minimizing ambient air dilution Reduces capital investment and operation costs by decreasing concentrated air volume Reduces air volume that requires abatement Less natural gas consumption Capture hood and floor sweeps Completely surrounds the source of emission Prevents fugitive emissions from entering the atmosphere Improves the work environment.
在船 & 海岸环境 we focus on each facility’s unique process design to attain a superior solution based on needs and available space. 推荐一个滚球官方网站可以使用现有的永久性墙, 条窗帘, 绝缘墙面板, 和/或满足安装预算的其他材料. Our experienced engineering team will work with the plant personnel to map each VOC emission source and identify the best location for collection, 其中可能包括抽油烟机和地板清扫的设计.
S&SE provides custom designed 永久总附件 (PTE) for a wide variety of applications. as a part of turnkey oxidizer installation project or upgrading of existing system. In the United States regulations require overall VOC control systems to maintain 90% efficiency or more for many industries. 对于许多应用程序的底层扫描 & capture hoods are not sufficient tools to achieve this level of control. A state-of-the-art VOC control system such as a PTE is required to meet federal & 国家规定.
以下五个标准, 由美国环保署根据测试方法204建立, 附件必须满足PTE资格.
Any natural draft opening (NDO) shall be at least 4 equivalent opening diameters from each VOC emitting source. An equivalent diameter is equal to the diameter of circle that has the same area as the opening. The total area of combined NDO’s shall not exceed 5% of the total surface area of the enclosure including the 地板和天花板.
The average face velocity (FV) of air through the NDO’s shall be at least 200 ft/min and the direction of flow shall be into the enclosure. All access doors and windows not included as NDOs shall be closed during routine operation of the process. All exhaust gases from the enclosure must be directed to a control device.
*Most state and local regulatory agencies have adopted these criteria as a basis for PTE design.