Difference between revisions of "Sweet Gas Cooler(HT-1101)"

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(Created page with "<!-- Sweet gas cooler pic--> The treated sweet gas exiting the top of the contactors will be saturated with amine/water and flows to the sweet gas cooler. (See Figure 5.) Here...")
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Revision as of 11:04, 21 June 2018

The treated sweet gas exiting the top of the contactors will be saturated with amine/water and flows to the sweet gas cooler. (See Figure 5.) Here the gas is cooled to condense and recover any amine/water mixture. The cooler reduces the load on the TEG unit by condensing some of the water the TEG unit would have to remove.

The sweet gas cooler is an aerial cooler with one bay equipped with two fans to cool the sweet gas to 104F. One fan runs at a fixed speed, while a variable frequency (VFD) motor controls the other. The outlet temperature is controlled by varying the speed of the VFD. The sweet gas cooler also uses a combination of internal air recirculation and fresh intake air to maintain stable cooling.

The plenum temperature is controlled by adjusting the position of two side louvers and the inside recirculation louvers. In FNNPF’s cold winters, warm air is recirculated in the cooler to prevent the condensed water from freezing in the tubes. This recirculating air is created by closing the top louvers and opening the recirculation louvers inside the cooler to keep the cooler and sweet gas warm.

Each cooler fan has its own local panel with start/stop controls. The west fan’s local panel also has a manual speed selector switch with fast/slow settings. Both fans are protected against excessive vibration. Each has a local high-vibration shutdown switch and a DCS reset button.

West Fan

The west fan’s motor-starter in the MCC Building is equipped with a remote/off/local switch and a VFD control panel. The motor starter’s remote/off/local switch is used to transfer control to the east fan. When the switch is set to:

  • Remote––the fan can only be operated from the Control Room. The CRO can either assume control of the fan (via DCS) or enable the DCS cooler’s outlet temperature controller to automatically control the fan. The Area Operator cannot control the fan from the local control panel in this mode.
  • Off––the fan is off and cannot be restarted from the Control Room or from the local control panel at the fan.
  • Local––neither the CRO nor the DCS gas outlet temperature controller can remotely control the fan. The fan can only be operated by the Area Operator (as directed by the CRO), using:
-the local start/stop control panel at the fan to start or stop the fan
-the local fast/slow speed selector switch at the fan to set the fan speed

East Fan

The east fan’s motor-starter in the MCC Building only has a remote/off/local switch. When the switch is set to:

  • Remote––the CRO operates the fan from the Control Room.
  • Local––the Area Operator uses the start/stop control panel at the fan to start or stop the fan as directed by the CRO
  • Off––the fan cannot be started or stopped from either the Control Room or the local start/stop control panel at the fan.

Temperature Alarms and Shutdowns

Alarm Title Description Cause and Effect
TAHH 1069 Temperature Alarm High – 120 F Indicates that the gas leaving the cooler is high in temperature. Ensure that the side louvers are working correctly and that the fans are operating. In summer months ensure that the recirculation louvers are closed to ensure maximum air flow across the tube bundles.
TALL 1069 Temperature Alarm Low – 75 F Indicates that the gas leaving the cooler is low in temperature. Ensure that the side louvers are working correctly and closed in and that the fans not required are shutdown. In winter months ensure that the recirculation louvers are open to ensure warm air flow within the cooler.
TAHH 1070 Temperature Alarm High – 115 F Indicates that the air leaving the top of cooler is high in temperature. Ensure that the side louvers are working correctly and that the fans are operating. In summer months ensure that the recirculation louvers are closed to ensure maximum air flow across the tube bundles. A high temperature here will lead to TAHH 1069 activation if not corrected.
TALL 1070 Temperature Alarm Low – 85 F Indicates that the air leaving the cooler is low in temperature. Ensure that the side louvers are closed in and that the fans not required are shutdown. In winter months ensure that the recirculation louvers are open to ensure warm air flow within the cooler.
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