tool:laserfilter
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tool:laserfilter [2019/04/01 17:45] – 00739 | tool:laserfilter [2021/05/05 15:55] (current) – johnc | ||
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- | Laser filter | + | ====== |
+ | It is well understood that depending on the material being " | ||
+ | |||
+ | Many commercial systems exist in order to address these concerns, and in general follow the same design principles: | ||
+ | - Utilize sufficient air flow to clear the space, while keeping the filter | ||
+ | - Have a staged filter setup to remove various substances consisting of: | ||
+ | - Pre-filtration - remove large particles using a larger bag filter, washable medium, or cheap pre-filter. | ||
+ | - Small Particle Filtration - HEPA filters or equivalent can be used to remove the majority of smaller particles generated by the laser/ | ||
+ | - VOC Removal - Although various methods for VOC removal exist, the most common is utilizing an activated carbon bed to remove any final VOCs | ||
+ | - Post Filter (Optional) - If concerns regarding the expulsion of carbon dust from the bed exist, such as a re circulation application, | ||
+ | - Use of sensors/ | ||
+ | |||
+ | VHS has a custom build design which incorporates all of these elements, and is flexible in order to pursue upgrades in the future as necessary. | ||
+ | |||
+ | ===== Air Flow Requirements ===== | ||
+ | For an 80W CO2 laser such as that of VHS, the suggested minimum flow rate is 250cfm. In order to meet these requirements, | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | Given the 6' ducting, and required filters, the major and minor Dp's were calculated and compared to the available fan curves. This determined that the optimum setup was a single M6 fan with minimal other backpressure as seen below: | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ===== Filter Setup ===== | ||
+ | In most cases, a prefilter, bagfilter, HEPA filter is the preferred option. This provides the longest lasting filter media for this application of the systems reviewed. However VHS has a modular setup that is arranged to accept standard 20" | ||
+ | - 2x reusable/ | ||
+ | - 4x Filtrete 1900 MPR 1900 " | ||
+ | - 6x trays of 1" Jacobi Ecosorb GXB Activated Carbon (or equivilant) | ||
+ | |||
+ | This system is designed to: a) reduce particulate entrapment in the fine particulate phase, b) ensure removal of particulate matter which is roughly similar to tobacco smoke as per literature on laser exhaust, and c) have sufficient residence time of the air in the carbon bed, while not increasing the overall dP of the filter system. | ||
+ | |||
+ | According to literature from the EPA ([[https:// | ||
+ | |||
+ | The current filter setup is shown below: | ||
+ | |||
+ | {{: | ||
+ | (Replace with updated and rotated photo) | ||
+ | |||
+ | ===== Filter Maintenance ===== | ||
+ | For the most part, the filter should be monitored using the dP, particulate, | ||
+ | - Wash the pre-filters once per week | ||
+ | - Replace the first particulate filter each month, and add a new one at the top of the stack (~$25) | ||
+ | - Replace the bottom carbon bed once it has doubled in weight, adding a new bed at the top of the stack (~$30) | ||
+ | |||
+ | ===== Testing ===== | ||
+ | The filter has been tested and will be continuously monitored by the control system to ensure: | ||
+ | - Min 300 cfm across the fan | ||
+ | - Max dP across the bed | ||
+ | - No VOC breakthrough | ||
+ | - No particulate breakthrough | ||
+ | |||
+ | At any time if there is a concern over filter operation or maintenance, | ||
+ | |||
+ | ===== List of Past Maintenance Logs ===== | ||
+ | |||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[tool: | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | * | ||
[[tool: | [[tool: | ||
+ | |||
+ |
tool/laserfilter.1554140733.txt.gz · Last modified: 2019/04/01 17:45 by 00739