The invention discloses an energy-saving and consumption-reducing
magnesium oxide flue gas desulfurization process and an energy-saving and consumption-reducing
magnesium oxide flue gas desulfurization device. The device consists of an absorbing
tower, a neutralizing tank, a concentration and
sedimentation tank, a
centrifugal separator and a middle tank, and is characterized in that
flue gas directly enters the absorbing
tower without passing through a pre-washing
tower; a cooling spray layer is arranged in the absorbing tower to cool down the entered
flue gas, so that area occupied is reduced; a filtering and
slag removing device is arranged behind an extraction pump, so that purity of
magnesium sulfide serving as a byproduct is improved; the neutralizing tank is provided with a magnesium
hydroxide feed port; and supernatant of the concentration and
sedimentation tank and dilute solution separated by the
centrifugal separator are used as absorption liquid to newly enter the absorbing tower after passing through the middle tank. The entire desulfurization
system has the advantages of simple process, no secondary
pollution, low
energy consumption and small occupied area and is particularly suitable for enterprises with magnesium
oxide resources and small reserved lands.