The experimental set-up is schematically shown in Fig. 1. Flue
gas with volume flux 170–200 Nm3 h1 was generated by a coalfired
boiler, which burned anthracite. Before entering a cyclone,
the flue gas passed through a buffer vessel, where a stirrer and
an electric heater ensured constant particle concentration and size
distribution, and regulated the temperature of the flue gas. The initial
particle number concentration can be regulated by adding diluted
air with the same temperature as flue gas into the buffer
vessel. In the cyclone, large particles were separated from the flue
gas. Heat preservation was used for the buffer, the cyclone and the
pipelines. After passing through the cyclone, the flue gas was pressurized
by a booster fan, and then entered the spray scrubber,
where it passed countercurrent to the desulfurization liquid. The
scrubbers were made of polycarbonate pipes and plates with excellent
heat resistance. The diameter and height of the scrubber were
150 mm and 3600 mm, which included 2250 mm of SO2 absorption
zone and 1350 mm of particle growth region. There was a corrugated
plate demister above the SO2 absorption zone to remove
the entrained droplets in the scrubbed flue gas. In addition, a
high-efficiency wire mesh demister was installed in the top of the particle growth region to remove the grown droplets with a total
removal efficiency of 20.35%. And the grade removal efficiency
of fine particles by this high-efficiency wire mesh demister is illustrated
in Fig. 2.
The experimental set-up is schematically shown in Fig. 1. Flue
gas with volume flux 170–200 Nm3 h1 was generated by a coalfired
boiler, which burned anthracite. Before entering a cyclone,
the flue gas passed through a buffer vessel, where a stirrer and
an electric heater ensured constant particle concentration and size
distribution, and regulated the temperature of the flue gas. The initial
particle number concentration can be regulated by adding diluted
air with the same temperature as flue gas into the buffer
vessel. In the cyclone, large particles were separated from the flue
gas. Heat preservation was used for the buffer, the cyclone and the
pipelines. After passing through the cyclone, the flue gas was pressurized
by a booster fan, and then entered the spray scrubber,
where it passed countercurrent to the desulfurization liquid. The
scrubbers were made of polycarbonate pipes and plates with excellent
heat resistance. The diameter and height of the scrubber were
150 mm and 3600 mm, which included 2250 mm of SO2 absorption
zone and 1350 mm of particle growth region. There was a corrugated
plate demister above the SO2 absorption zone to remove
the entrained droplets in the scrubbed flue gas. In addition, a
high-efficiency wire mesh demister was installed in the top of the particle growth region to remove the grown droplets with a total
removal efficiency of 20.35%. And the grade removal efficiency
of fine particles by this high-efficiency wire mesh demister is illustrated
in Fig. 2.
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