Attemperators have been a key component of Combined Cycle Power Plants for many years. Back when the units were base loaded, spray water control was a non-issue. In today’s world, plants are ramping up and down daily, putting a strain on steam temperature control regulation.
Attemperator Spray Control Read More »
Specific to the design and piping layout of every plant is a Net Positive Suction Head (NPSH) available for a boiler feed pump. This defines the inlet pressure at the suction side of the pump, due to the effects of gravity and system design.
Boiler Feedwater Recirculation Valve Read More »
Keeping accurate and stable drum level control is vital to optimal plant operation, but there are many challenges that are inherent with this process. Innate to level control on a drum style boiler is a dynamic called “shrink and swell”, which is caused by the formation of vapor bubbles in the boiler evaporation tubes as steam demand changes.
Feedwater Regulator for Drum Boilers Read More »
Whether a combustion turbine is installed as a simple cycle peaking unit, or in a combined cycle plant with a Heat Recovery Steam Generator (HRSG), it is an integral part of the power generation portfolio for many generation companies.
Inlet Guide Vanes Air Flow Control Read More »
Steam turbines can be found in almost any processing plant or power generation facility. In processing plants, steam turbines are used as the driver for other rotating equipment, converting thermal energy to rotational energy ultimately to control input speed of a driven device.
Steam Turbine Control Read More »
Combined Cycle Power Plant operators are under constant pressure to increase on-line availability. One of the most critical systems to facilitate this undertaking is the Steam Turbine Bypass System. Commonly used for startup, shutdown, and steam turbine trips, as plants are more frequently cycled, these systems are often being called-on to perform in low load and simple cycle operations
Turbine Bypass System Optimization Read More »
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 »
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 »
Coke ovens process coal into coke, which is used as a fuel source in steel mill blast furnaces. The transformation is done in batches in a coke oven battery at temperatures up to 1,100°C for approximately 24 hours. Coal carbonization is done in what’s called a “reducing atmosphere furnace” where oxygen and other oxidizing gases are absent.
Coke Oven Collection Main Pressure Control Read More »
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 »