The following list shows various models of incinerators traditionally sold by WRT over the past several years. These units can be classed into two groups: air curtain “pit” burners (“ACD”) and controlled-air afterburner types.
WRT has installed ACD units for cities with populations as small as 2000 to populations of 4,000,000. Most all cities and counties offer trash service to its citizens, that is, they will pick up their tree branches, limbs, yard waste, and demolition wood waste. The use of an EPA approved ACD system is usually the least expensive way to not only dispose of this waste stream, but recycle the residue into an approved soil enhancer. Of the over 3,000 landfills in the country, 95% of them could make use of an ACD unit. These units are also used in various industries to dispose of waste generated by their operations.
WRT manufactures ACD units in five different sizes of above ground refractory lined pits equipped with an over-fire air system that creates a 130 mph curtain of air in a horizontal plane the length of the pit. This creates a tornado reaction inside the refractory lined pit. The burning material below the air curtain is resting on a hearth that is equipped with WRT's special designed under-fire air system. This system forces air up through the burning bed, much like a blacksmith's forge. The reaction of the over-fire air and the under-fire air system drives the temperature up to over 2200 deg. F and reduces the volume of combustible wood waste by 99.3% to a sterilized ash that is approved as a soil additive by the Department of Agriculture. Since all smoke is burned at 1600 deg. F., this unit operates smokeless and meets all federal and state standards.
Because some cities, counties, industries and institutions have special waste streams that are not permitted to be burned in an ACD, WRT has designed controlled-air units that allow these facilities to burn their hard to dispose of material and still meet the federal EPA and state standards. To meet these requirements WRT manufactures 10 different sizes of controlled air or starved air combustors. These units burn the waste then burn the smoke and particulate. This is done by using three different chambers. The first chamber is operated at 1500 deg. F. where the waste is burning, using very little oxygen. As the waste burns, it turns into smoke, particulate and a 1500 deg. F gas of carbon monoxide. This mixture leaves this primary combustion chamber and enters the air mixing chamber. Once the smoke, particulate and carbon monoxide enter the air mixing chamber, air is blown in tangentially to provide complete mixing of the gases. The 1500 deg. F. carbon monoxide and oxygen combine in a controlled explosion and the temperature at the exit point of this chamber is 2000 deg.F. The oxygen which has joined with the carbon monoxide has now turned to carbon dioxide and water vapor. Once these gases leave the air mixing chamber, they enter the pollution control chamber. The pollution control chamber will hold these gases for one full second, which is time enough to allow the 1800 to 2000 deg. F. chamber to eliminate all smoke and unburned particulate. Since all smoke is totally destroyed at 1600 deg. F., the emissions coming out of the stack has no smoke, odor or fly ash.
WRT has designed, manufactured and installed Waste to Energy (“WTE”) systems for industries as small as 20 employees to over 1000 employees. Those industries most interested are food processing plants that use steam in their cooking, canning, sanitizing and heating and wood industries, such as furniture manufacturers. With high alternative fuel costs, payout of this equipment is often less than two years.
Energy recovery – this accessory can be added to a number of models and can be custom configured to meet the needs of the customer, the most common being a boiler system for steam generation for heating purposes or to generate electricity. This accessory can be accommodated to fit incinerators processing 3 to 56 tpd.
Waste water sludge – this accessory is being developed as an addition to several models and uses the heat generated from the incinerator to process the sludge. This process operates differently from the sand/sludge unit described above.
Oil recycling – this accessory separates oil from other waste so that several materials are recycled. The unit processes oilfield waste such as used filters, oily rags, oil spill booms and pads, oil sludge, contaminated oil and water and used barrels.
Scrubber – this accessory is used when emission standards are extremely stringent. The process is basically a separate chamber where the emissions are burned again prior to leaving the confines of the incinerator.
Stack Gas Analyzers – this device is used to continuously measure CO, CO2, NOX, O2 emissions and this year some heavy metals.
Dumpers and Loaders – many units are constructed so that a hydraulic loader can be added to make loading easier and measured to better enhance the performance of the unit. Due to location constraints, loaders may be a mandatory accessory. Loaders are available on a number of models.
Crane loading – an overhead crane is standard on the 4013 model but custom built cranes of different configurations can be made to many units.
Most models, including accessory items, can be fabricated in less than one month; however, the sale-to-installation process can take up to three months. In a normal sales transaction, the first thirty days covers any specific engineering changes to the model, the ordering of raw materials and components and the permitting process. Although the permitting process may only take a few days at WRT, the approval by regulatory authorities is at the regulatory authority’s discretion. Initial regulatory approval, however, is usually within the ninety day period prior to installation. The second thirty days is fabrication. The final thirty days is transportation to the site, installation, heat curing the refractory material and actual regulatory emissions testing.
Each unit and accessory item is designed, engineered and permitted for a combination of specific purpose, location, regulations and volume of material to be processed.