NH₃ Injection Systems

Ammonia (NH₃) can be added to the flue gas to 1) neutralize excessive SO₃, thereby lowering the acid dewpoint 2) minimize rapping re-entrainment and 3) agglomerate fine particulate. By lowering the SO₃ content in the flue gas, the electrostatic force holding the flyash to the collecting plate is increased and rapping re-entrainment is reduced. NH₃ combines with SO₃ which reduces the formation of excess acid and the appearance of a "blue plume." NH₃ can also act as an agglomerator to combine fine particulates. This creates higher migration velocities and improves collection efficiency.

The system consists of an NH₃ storage and handling facility, a metering and dilution unit, NH₃ piping and distribution probes.

Tank trucks deliver liquid NH₃ which is transferred directly into a storage vessel. The insulated vessel is heated which in turn generates gaseous NH₃ upon demand. The system has process controls for maintaining the required heat input and instrumentation for monitoring pressure, level and temperature as well as isolation and safety relief valves. All of the equipment to generate dilute gaseous NH₃ is housed in a separate heated, lighted and ventilated enclosure.

The enclosure contains the central control/power distribution panel, air inlet filter, process air blower, NH₃ metering valves and a mixing chamber to achieve a thorough gas and air mixture.

The outlet of the mixing chamber connects to the NH₃ distribution piping. The probes are installed directly into the flue gas stream and provide the final gas distribution. The probe design preheats the mixture before injection utilizing heat extracted from the flue gas. This prevents corrosion, pluggage and external buildups, and enhances dispersion.

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Anhydrous Ammonia Systems

Ammonia (NH₃) can be added to the flue gas of an Electrostatic Precipitator to

1. neutralize excessive SO₃, thereby lowering the acid dewpoint
2. minimize rapping re-entrainment
3. agglomerate fine particulate.

By lowering the SO₃ content in the flue gas, the electrostatic force holding the flyash to the collecting plate is increased and rapping re-entrainment is reduced. NH3 combines with SO3 which reduces the formation of excess acid and the appearance of a "blue plume." NH₃ can also act as an agglomerator to combine fine particulates. This creates higher migration velocities and improves collection efficiency.

The system consists of an NH3 storage and handling facility, a metering and dilution unit, NH₃ piping and distribution probes.

Tanker trucks deliver liquid NH₃ which is transferred directly into a storage vessel. The insulated vessel is heated which in turn generates gaseous NH₃ upon demand. The system has process controls for maintaining the required heat input and instrumentation for monitoring pressure, level and temperature as well as isolation and safety relief valves. All of the equipment to generate dilute gaseous NH₃ is housed in a separate heated, lighted and ventilated enclosure.

The enclosure contains the central control/power distribution panel, air inlet filter, process air blower, NH₃ metering valves and a mixing chamber to achieve a thorough gas and air mixture.

The outlet of the mixing chamber connects to the NH₃ distribution piping. The probes are installed directly into the flue gas stream and provide the final gas distribution. The probe design preheats the mixture before injection utilizing heat extracted from the flue gas. This prevents corrosion, pluggage and external buildups, and enhances dispersion.

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