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Gas is supplied to the skid through a 4” flange fitting on the skid inlet. Upon entering the skid, biogas first passes through an inlet heat exchanger where the gas is cooled to 70 ̊F using chilled glycol. The glycol is cooled in a remote chiller and piped to the skid. The cold gas now enters the suction scrubber, where a portion of the moisture entrained in the gas is removed. After exiting the suction scrubber, the gas is compressed to approximately 100 psig using a rotary screw compressor. Gas leaves the compressor at about 200 ̊F entrained with oil and flows through an oil separator and coalescing filter where the oil is separated from the gas. Next, the compressed gas is cooled in a gas/gas Flat Plate heat exchanger. Followed by a gas to chilled glycol heat exchanger. This heat exchanger utilizes the same glycol loop used in the first cooling stage. After chilling, the gas goes through a second stage of condensate removal in a moisture separating vessel. Next, the process gas flows back through the gas/gas heat exchanger where it is reheated to 80oF. This process ensures that the final dew point of the gas is below 45 ̊F, and the final relative humidity is about 23%. Skid discharge pressure is maintained by a modulating valve which adjusts to maintain operating pressure set-point by re-circulating some of the discharge gas back to the inlet of the compressor. A second modulating valve sends excess gas to a flare to be burned off. Process gas leaves the compression skid, and travels through a series of siloxane filtration vessels, before it is sent to the turbines. The turbine header distributes gas to the turbines through fuel kits. Every fuel kit contains a particulate filter and a pressure regulator which reduces gas pressure to approximately 75 psi. As the turbines consume the biogas, they produce 480V, 3 PH, 60 Hz power. Section 1 System Overview Page 2PDF Image | ST PETERSBURG TABLE OF CONTENTS
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