Pakkala J.,Durr Systems Inc.
Pollution Engineering | Year: 2010
Dürr Systems Inc., has unveiled a scrubbing system, which utilizes a regenerative dry filtration process that separates wet paint overspray from spray booth process air. The process allows significant reductions in paint spray booth energy usage and emissions. Spray booths are the leading energy consumer at most large-volume paint finishing operations. By recirculating a substantial portion of exhausted air from the spray booth back into the painting chamber, the quantity of air that must be fully conditioned is significantly reduced. The dry system operates by directing paint-laden process air into scrubber chambers located directly below and on either side of the painting chamber. Each scrubbing chamber contains an array of porous, plastic filter elements. To protect the filter elements from becoming fouled with tacky paint particles, a process referred to as pre-coating is utilized. The pre-coat process extends the life of the filter elements to a minimum of 15,000 hours. Source
Stone J.,Durr Systems Inc.
Pollution Engineering | Year: 2012
The article focuses on the effectiveness of regenerative thermal oxidation (RTO) in removing odor from industrial plants. There is no need to add consumables or adjust chemistries. Destroying odors with high temperatures is rarely a question of effectiveness. The use of high temperatures - typically in excess of 1,500°F - in a thermal oxidizer proves effective. It also proves to be a slightly more expensive option to operate compared to less effective odor control systems, unless the RTO is designed with maximum possible heat recovery to minimize use of purchased fuel to operate. The typical argument against using thermal oxidation has come with costs of ownership. However, because of new advancements in equipment, a prudent purchasing agent can find the perfect balance of cost efficiency and effectiveness with the right thermal oxidation technology. About 15 years ago, RTO technology was revolutionized by the introduction of the rotary diverter valve design. Source
Hommes J.,Durr Systems Inc.
Pollution Engineering | Year: 2011
Jon Hommes shares his views on the need to select the right emission control system for hazardous air pollutants (HAPs) and volatile organic compounds (VOCs). He states that a suitable emission control system can efficiently and economically help dispose of these environmentally hazardous wastes. The benefits of a single, centralized thermal oxidation system is demonstrated with a case study of a plant that has added emission controls to multiple existing production processes. Two types of thermal oxidizers are applied in the chemical process industry, such as regenerative thermal oxidizers (RTOs) and direct-fired thermal oxidizers (DFTOs). RTOs offer high thermal efficiency and very low fuel requirements for plants generating dilute air streams contaminated with low concentrations of VOCs and HAPs. A company manufacturing organic intermediates for the pharmaceutical and fertilizers industry has installed a DFTO system to handle all liquid and gaseous waste streams from their small to mid-size process reactors and storage tank vents. Source
Griffin J.,Durr Systems Inc.
Pollution Engineering | Year: 2011
The EPA has published the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Portland Cement Manufacturing Industry, and New Source Performance Standards (NSPS) for Portland Cement Plants in the Federal Register. Cement manufacturing plants are dependent on quarry mining operations that supply clay and limestone to the plant processes. Materials are dried, pre-heated, calcined and sintered into a cement clinker. Visible emissions from plant exhaust, predominantly from sulfurous compounds and particulate, often justified the installation of improved fabric filters and baghouses. RTOs have been in existence for more than 30 years. However, only the latest generation rotary valve systems have demonstrated effective and reliable results for reducing emissions from a cement plant. Generally, the environmental equipment supplier conducts an initial engineering study, which is based off of a joint effort between the supplier and the cement manufacturer. Source
Yu G.,Durr Systems Inc.
Metal Finishing | Year: 2013
The vehicle baking process is a three-dimensional, transient conjugate heat transfer process with a relative movement between the vehicle body and the oven. Simulation of this process needs to overcome several difficulties. First, an extremely wideranging dimensional scale in an oven has to be accommodated in the model. Ovens are typically several hundred meters long, and the air nozzle or some vehicle parts would be as small as a few inches. All the governing equations for the airflow in the oven, the radiation heat transfer between oven and vehicle, the conduction heat transfer in the body, and the convection heat transfer between the air and body were solved simultaneously with a segregated algorithm at each time step. The computed body temperature and flow field data were saved every 5 seconds during the solving process. Source