Wet type desulfurization system for flue gas

Claim 1

A wet type desulfurization system for a stream of flue gas involving sulfurous gases, comprising a plurality of serially interconnected heat exchangers; means for passing the flue gas through said heat exchangers, whereby the temperature of said flue gas is successively reduced to about 70* C; a cooling tower means receiving said temperature reduced flue gas from the last of the serially interconnected heat exchangers for further cooling said flue gas to a temperature of about 30* C, whereby the gas is pre-desulphurized; an absorbing tower connected to the cooling tower and receiving the flue gas at the temperature of about 30* C; a refrigerated purifying liquid introduced into said absorbing tower in direct contact with said flue gas, thereby purifying the flue gas and reducing the temperature thereof to about 10* C; a heater in the path of the purified gas from the absorption tower for raising the temperature of the purified flue gases whereby the heated purified gases may diffuse into the atmosphere; a first absorption refrigerator comprising a first condenser, a first evaporator and a first absorber and a first regenerator; a heat pump absorption refrigerator comprising a second condenser, a second evaporator and a second absorber and a second generator; means for conducting heat from at least one of the heat exchangers to the first regenerator, whereby the first evaporator is cooled; means for conducting said purifying liquid through said first evaporator for refrigerating said purifying liquid to a temperature of about 0* C; means for conducting the heat from at least one of said heat exchangers to said second regenerator whereby said second evaporator is cooled, a coolant liquid circulated between the second evaporator and at least one of the heat exchangers for removing heat from said heat exchanger; and means for conducting heat from the second absorber to said heater.