Macrotek Inc. articles

Fundamental design principals of the flooded disc scrubber - a variable throat orifice contactor are presented. Test data from the pilot demonstration unit and full scale operations on lime kiln, refining furnace, and incinerator applications are presented and compared.

Conclusions are that performance on a given application is a function of pressure drop and particle size distribution. In addition, the actual performance of the Macrotek MVA Scrubber is significantly better than predi

A major pulp and paper mill located in New England, USA was faced with a control order to reduce SO₂ and a schedule challenge to meet the order deadline and steam requirements. In addition, the customer was looking for ways to save reagent cost.

Macrotek was selected to design and build two wet FGD systems for two 100,000 lbs/hr medium sulfur coal fired boilers. The design included a two-stage spray tower configuration. In the first stage, waste alkaline liquid was used to

A precious metal refiner required the most advanced particulate scrubber to replace wet ESP for submicron particulate collection. Due to the very high gold prices, economic reasons were the driving force toward maximum removal efficiency.

Macrotek was selected to design and install their ultra high efficiency flooded disc MVA scrubber. In addition to the high removal efficiency for submicron particles, material selection proved a significant factor due to high chloride and fluoride le

A major Gulf Coast refinery was searching for a solution to reduce flare gas SO₂ that was resulting from very high H₂S concentrations during periodic venting events. Original considerations were limited to very costly upstream equipment changes or a sulphur recovery unit, all costing tens of millions of dollars.

Macrotek was contracted to design and build a cost-effective H2S scrubbing unit to reduce the H2S down to EPA acceptable limits for the SO₂ re

Hydrogen Sulfide is a highly toxic and flammable gas. Being heavier than air, it tends to accumulate at the bottom of poorly ventilated spaces. Although very pungent at first, it quickly deadens the sense of smell, so potential victims may be unaware of its presence until it is too late. The lethal concentration for 50% of humans is 800ppm for 5 minutes of exposure. H₂S is a by-product in many hydrometallurgical processes. Macrotek has done many systems for some of the major multi-

A major uranium refiner required an air pollution control system to control emissions from their hazardous incinerator. The presence of radioactive material demanded that outlet emissions approach non-detectable levels. Macrotek was contracted to design and supply the system.

Advanced, cutting edge technology was used to design a system with the lowest possible emissions, which has been operational for several years. The system is tested annually and exceeds the permit requirements.