Application Spotlight

Furnace and Heater Stack Dampers

Furnaces are used in refineries and petrochemical plants to break down hydrocarbon fluids, converting them into fuels or chemicals such as gasoline, diesel, ethylene, and propylene. Furnaces can account for more than 50% of the total plant energy consumption, therefore small improvements in efficiency could have large financial returns. Continuously evolving federal and local environmental laws mandate refineries and petrochemical plants to carefully monitor and reduce cumulative CO & NOx emissions.

Furnace and Heater Stack Dampers Read More »

Furnace Draft Pressure Control

Coal fired power plant operators are facing regulatory pressures to reduce emissions, including NOx and SOx. At the same time generation demand is declining, plants are forced to cycle on and off as well as run at lower minimum loads to remain on line. These two objectives create challenges to a plant’s operating practices, many of which were established and refined under constant operation/base load scenarios.

Furnace Draft Pressure Control Read More »

Fluid Catalytic Cracking Flue Gas Slide Valve

Fluid catalytic cracking (FCC) is an essential process in refineries, used to convert heavy feedstock oil into valuable gasoline, jet fuel, and diesel, amongst other products. During the FCC reaction coke builds up on the catalyst, limiting the catalyst’s ability to carry out the reaction. The spent catalyst is then transferred to the regenerator to burn off the residual coke.

Fluid Catalytic Cracking Flue Gas Slide Valve Read More »

Filtration Filter Effluent Control

Most drinking water plants combine a conventional gravity-fed filtration system with a means for disinfection as part of the water treatment process. As the last stage of particle removal prior to disinfection, filtration plays a critical role in assuring safe water quality, given that many pathogens can escape common methods of disinfection under the cover of particle-filled water. Filter performance is evaluated based on turbidity, which effectively uses the clarity of liquid to indicate the amount of particulate present in the water.

Filtration Filter Effluent Control Read More »

Distribution Water Pumping

Reliable access to drinking water is an overlooked necessity to the modern world. Water is transported for supply and distribution by gravity-fed or pumped infrastructures. When using pump stations, it is critical to ensure full capacity is always readily available. Standard design practices were created to promote reliable operation, but the technology available has not always been up to the task.

Distribution Water Pumping Read More »

Compressor Antisurge

Axial and centrifugal compressors are expensive, critical pieces of equipment that can be found at the heart of many industrial processes and across a multitude of industry segments. Implementing the correct, high performance compressor control strategy has direct impact upon the control of the process and the profitability of the plant. It is important to have control that is both responsive and stable to improve yield and ensure compressor availability is maximized. One of the main applications to ensure maximizing availability and throughput is Antisurge Control.

Compressor Antisurge Read More »

Collections Wet Weather Management

Faced with the threat of permit violations or even fines, municipalities are under the gun to control wet weather events in a manner that minimizes storm water discharges into local water ways. Older cities with combined sewer systems are particularly vulnerable. Many different mitigation strategies, ranging from holding ponds to deep-rock tunnel projects, are being implemented as a means to store high flows during wet weather events.

Collections Wet Weather Management Read More »

Cement Kiln Feed Control

Cement is pyroprocessed in long, cylindrical kilns that rotate axially at a rate 30 to 250 revolutions per hour. The axis of the kiln is slightly sloped, typically 1-4º, enabling the raw mix or meal that’s fed into the upper end of the tube to be properly processed at the prescribed rate. A burner pipe located at the opposite end of the kiln produces  charge temperatures of approximately 1450º C.

Cement Kiln Feed Control Read More »

Basis Weight Valve

A REXA Electraulic™ Actuator was installed on a basis weight valve at a paper mill in the Northeast United States. An extensive benchmark test was performed to verify the REXA basis weight solution can meet or exceed the performance of the existing basis weight valve actuator. After eight months of run time, process data was collected to verify actuator performance

Basis Weight Valve Read More »