Thermal Actively Controlled Sludge Treatment
NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
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The SERDP Program CP 1132 was started in FY99 to develop a combustion system for the treatment of shipboard generated oily and non-oily wastes, which have to be disposed in an environmentally acceptable manner according to International Maritime Organization IMO regulations. To comply with IMO MARPOL ANNEX 1 and 6 proposed, on-board thermal destruction incineration in compact, efficient, and continuously monitored combustion devices may be required to avoid the high cost of storage, off-loading, treatment, and disposal. IMO standards require CO emissions of less than 200 milligram mgmegajoule MJ equivalent to approximately 420 parts per million ppm corrected to 7 O2 and exhaust emission opacity smoke of less than 20, which corresponds to a Bacharach number of 3. The selected incinerator concept was based on a high performance Vortex Containment Combustor VCC, which provides high firing density and high particulate matter trapping. In addition to the treatment of shipboard generated wastes, shore and harbor applications were explored in sub-scale experiments. For this purpose, the VCC was integrated with an efficient, compact, actively controlled afterburner AB. Initially it was planned to also use the integrated VCCAB for shipboard applications however the IMO performance could be obtained without AB. The VCC is a demonstrated technology for combustion of pulverized coal and other fuels Ref. 1. The concept involves a spinning combustion zone with long residence times for liquid droplets solid particles and a classic cyclone-type flow for separation and trapping of noncombustible solids as ash Figure 1. In the present program the VCC was modified for the treatment of marine sludge with highly variable characteristics and heat content.
- Combustion and Ignition
- Solid Wastes and Pollution and Control