Cleaning devices

A clean discharge is vit to good belt hfe. On the return run the carrying side of the belt is in contact with the return rollers, and any material adhering to it is ground in or deposited on the roller. Extremely sticky material may require a belt-cleaning device in the form of a... 

Periodically clean via flushing, blowdown, internal line cleaning devices (e.g., pigs )... 

List several types of air cleaning devices that can be used to remove airborne particulate matter. Rank these in order of their collection efficiency and typical maximum size particle capture. 

Probably there is hide that can be done in the design of a stack to avoid this problem, although raising the elevation could be of value. In such cases, air pollution control can probably be implemented only by process reduction during unfavorable wind conditions or by permanent stack gas cleaning devices. In the lee of a chff there may be eddies of the type shown in Figure 3. 

Detect the condition of and operate filters and dust-cleaning devices. Receive and register status and alarm messages. 

Arrestment The removal of a pollutant ftom a gas stream by an arrester or a cleaning device. 

Efficiency, filter The ratio of the number of particles retained by a filter or other air cleaning device to the number of particles entering, expressed as a percentage. 

Self-cleaning An air-cleaning device that has the ability to be mechanically or chemically cleaned. 

Foam scrubber A cleaning device that uses foam as a collecting medium for particulate matter in a gas stream. 

Particle scrubbing A gas-cleaning device that generates large particles that can be easily collected by combining them with liquid droplets issued from fine jets. 

Primary collector An air-cleaning device that removes the larger particulate matter before a HEPA filter. 

Wet collector A gas-cleaning device that uses a fluid for the removal of a pollutant from an air or gas stream. 

Where dusts, grits, sawdust or other large particles are being extracted it is normally mandatory to include an air-cleaning device before the air is exhausted. Unless they are toxic or odorous fumes can normally be simply exhausted into the atmosphere at a suitable location well away from anywhere with normal personnel access. 

Although generally associated with manual cleaning, it is possible to obtain fully automatic bag filter systems. These have a hydraulic backwashing and bag-cleaning device solidly attached to the steel bag housing. 

The correct application of either sizing technique will result in a duct network that works well on air. It is equally important to ensure that each air flow is adequate to transfer all the particulates from the hood/enclosure to the collection and/or cleaning device. Unfortunately, many dust control systems have been designed and/or are being operated with little or no regard for what actually has to go through the hood-duct network. This can result in ... 

Minimum Duct Velocity. Once the types and locations of hoods, enclosures and booths have been established and the exhaust rates determined, it is necessary to design the ductwork to transfer the contaminated gas to the collection or cleaning device. An essential parameter required for this purpose is the minimum duct or conveying velocity, Vfmm, which is required to ... 

From an operator s perspective, the scrubbing system required very little attention. Normally, the only attention required is a routine walk-by of the equipment to ensure that everything is in normal operation. Since 1998 the refinery took the RCC out of operation and moved the EDV Wet Scrubbing System over to their SRU and applied it as a tail gas cleaning device. The system is presently operating at very high efficiency as a tail gas unit to rave reviews of the refinery client. 

Air cleaning devices Where possible, air-cleaning devices should be located close to the process to avoid contamination of exhaust ductwork. Bag in/bag out (safe-change) filters or comparable required for all filtration systems... 

Bore cleaning products include an electrochemical cleaning device and numerous chemical cleaning mixtures, containing both organic and inorganic compounds, the compositions of which are commercial secrets. 

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