DCFS Scrubber Start-up and Operation for Gorgas, Miller and Hammond.

摘要

Advatech has recently started up three Double Contact Flow Scrubber (DCFS) absorbers for Southern Company at three plants. The FGD system at Alabama Power Plant Gorgas is the largest Stebbins scrubber at l,020MW nameplate capacity, and it began operation in December 2007. The FGD system at Georgia Power's Plant Hammond began operation in March 2008. Both of these absorbers are designed to treat flue gas from multiple boilers and have recorded 100% availability during a defined test period and greater than 99% SO2 removal at times. The twin-tower DCFS design was used in both projects.A third Advatech scrubber installation is at Alabama Power's Plant Miller, which has four coal-fired boilers each with 660MW nameplate capacity. Four single-tower DCFS scrubbers have been constructed at this plant, three of which began operation in 2010 with the fourth scheduled for initial operation in 2011.Advatech faced several challenges in starting up the Gorgas, Hammond, and Miller scrubbers:• Low-load performance can be optimized by using a separation valve in the spray header to operate only the (first) co-current tower of the two-tower absorbers at Gorgas and Hammond.• Gypsum crystal shape and dewatering properties can be influenced by changing operating conditions.This paper will discuss the operation of all three FGD systems and the operation results and unique features of these scrubbers.