Plymouth, MI, United States
Plymouth, MI, United States

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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.


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.


Stone J.,Durr Systems Inc. | Schroeder J.,Durr Systems Inc.
Air and Waste Management Association - International Conference on Thermal Treatment Technologies and Hazardous Waste Combustors 2012 | Year: 2012

Underground coal mines use extensive ventilation systems to circulate large quantities of air through the mine to keep methane, which is liberated when the coal is mined, from building up underground, which then maintains safe working conditions. This air is then vented at the surface, with methane concentrations up to about 1%. Mine ventilation systems typically are the largest source of methane emissions from underground coal mines1, although currently, there is no regulation to limit its release. However, by voluntarily abating this ventilation air methane (VAM), carbon credits or offsets can be created that have value in a carbon offset trading market. Methane is a potent greenhouse gas, having 21 times the global warming potential of carbon dioxide. Carbon markets have had fortunes rise and fall over the last few years, but voluntary VAM abatement projects have pressed on. A regenerative thermal oxidizer (RTO) system can effectively and safely abate methane emissions in mine ventilation air. The US now has in place its first operational RTO on a full-scale VAM exhaust at an underground coal mine in West Virginia. The scope of this project included all design, fabrication, installation, and commissioning of a 160,000 scfm RTO system from the mine VAM evasé exit point to the clean gas exit stack on the RTO. Critical to the successful implementation of the system was the modeling, design, and creation of a unique capture hood to convey VAM to the RTO without interrupting ongoing VAM exhaust profiles or velocity. Operational results show methane removal well in excess of 97% overall.


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.


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.


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.


Patent
Durr Systems Inc. | Date: 2010-08-13

A paint delivery and application apparatus, wherein the apparatus includes a source of paint, a paint applicator, a supply line interconnecting the source of paint and the applicator and at least one pig in the supply line, wherein the paint pushes the pig from adjacent the source of paint to the paint applicator and a source of purging solvent delivering a small volume of purging solvent to the supply line when the pig is adjacent the source of paint adjacent to and upstream of the pig acting as a lubricant, reducing chattering and skipping of the pig and extending the life of the pig. Where the apparatus includes two pigs, purging solvent is delivered between the pigs adjacent the applicator, the pigs are delivered to adjacent the source of paint and a small volume of solvent is then delivered from between the pigs upstream of the pigs.


Patent
Durr Systems Inc. | Date: 2013-08-30

Apparatus and methods are disclosed to improved block channel geometries and arrangements of thermal oxidizers. One described example apparatus includes a block of a converter having a plurality of channels defining interior walls, which define a cellular pattern in a cross-sectional view of the block. The pattern comprises regular sub-patterns consisting of at least one central channel, which is proximate an interior of the block, and a plurality of surrounding channels.


Patent
Durr Systems Inc. | Date: 2011-01-13

An oven assembly for baking coatings applied to an object includes a housing with a header receiving pressurized air from a ventilator disposed outside the oven. A heater provides heat to the pressurized air received from the ventilator raising the temperature of the pressurized air to between about two and four times curing temperature in Fahrenheit degrees of the coatings applied to the object. The header extends from the heater into the housing. The header has nozzles disposed at spaced locations directing pressurized air at the temperature being between about two and four times the curing temperature in Fahrenheit degrees of the coating applied to the object toward predetermined locations on the object.


Patent
Durr Systems Inc. | Date: 2014-07-16

A paint delivery and application apparatus, wherein the apparatus includes a source of paint, a paint applicator, a supply line interconnecting the source of paint and the applicator and at least one pig in the supply line, wherein the paint pushes the pig from adjacent the source of paint to the paint applicator and a source of purging solvent delivering a small volume of purging solvent to the supply line when the pig is adjacent the source of paint adjacent to and upstream of the pig acting as a lubricant, reducing chattering and skipping of the pig and extending the life of the pig. Where the apparatus includes two pigs, purging solvent is delivered between the pigs adjacent the applicator, the pigs are delivered to adjacent the source of paint and a small volume of solvent is then delivered from between the pigs upstream of the pigs.

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