An air pollution control apparatus includes: a denitration unit that removes nitrogen oxides from a flue gas; a desulfurization unit that is installed on a gas flow downstream side of the denitration unit to remove the sulfur oxides in a flue gas 11B; a finish denitration and desulfurization unit that is installed on the gas flow downstream side of the desulfurization unit to perform finish denitration and desulfurization of NO.sub.2 and SO.sub.2; and a carbon dioxide recovery unit that is installed on the gas flow downstream side of the finish denitration and desulfurization unit to remove and recover the carbon dioxide in a flue gas.

An air pollution control apparatus includes: a denitration unit that removes nitrogen oxides from a flue gas; a desulfurization unit that is installed on a gas flow downstream side of the denitration unit to remove the sulfur oxides in a flue gas 11B; a finish denitration and desulfurization unit that is installed on the gas flow downstream side of the desulfurization unit to perform finish denitration and desulfurization of NO.sub.2 and SO.sub.2; and a carbon dioxide recovery unit that is installed on the gas flow downstream side of the finish denitration and desulfurization unit to remove and recover the carbon dioxide in a flue gas.

A CO.sub.2 recovery device is provided with a CO.sub.2 absorption tower and an absorption-solution regeneration tower. The CO.sub.2 absorption tower includes: a CO.sub.2 absorption section in which CO.sub.2-containing flue gas is brought into contact with a CO.sub.2 absorption solution, namely a basic-amine-compound absorption solution, so as to remove CO.sub.2 from the CO.sub.2-containing flue gas; and a water-washing section in which decarbonated flue gas from which CO.sub.2 has been removed is brought into contact with washing water so as to remove accompanying substances accompanying the decarbonated flue gas. The absorption-solution regeneration tower regenerates the CO.sub.2 absorption solution that has absorbed CO.sub.2. This CO.sub.2 recovery device, in which a lean solution from which CO.sub.2 has been removed is reused in the CO.sub.2 absorption tower, has an aldehyde-removing agent supply unit that supplies a sulfite-compound aldehyde removing agent to a circulating washing-water line that circulates the washing water to the water-washing section.

A CO.sub.2 recovery device is provided with a CO.sub.2 absorption tower and an absorption-solution regeneration tower. The CO.sub.2 absorption tower includes: a CO.sub.2 absorption section in which CO.sub.2-containing flue gas is brought into contact with a CO.sub.2 absorption solution, namely a basic-amine-compound absorption solution, so as to remove CO.sub.2 from the CO.sub.2-containing flue gas; and a water-washing section in which decarbonated flue gas from which CO.sub.2 has been removed is brought into contact with washing water so as to remove accompanying substances accompanying the decarbonated flue gas. The absorption-solution regeneration tower regenerates the CO.sub.2 absorption solution that has absorbed CO.sub.2. This CO.sub.2 recovery device, in which a lean solution from which CO.sub.2 has been removed is reused in the CO.sub.2 absorption tower, has an aldehyde-removing agent supply unit that supplies a sulfite-compound aldehyde removing agent to a circulating washing-water line that circulates the washing water to the water-washing section.

A device for converting harmful waste products into environmentally friendly discharge is provided. The discharge, as a result of the waste destruction process, meets or exceeds the Environmental Protection Agency (EPA) standards. The device includes a waste disposal chamber where a crucible is positioned. The crucible is configured to retain a removable basket that is heated via induction heating. The waste residing within the removable basket is then vaporized and ionized within a vacuum to form a waste gas that is drawn through an accelerated jet of thermal plasma via vacuum suction. Once the waste gas passes through the plasma, it passes through a discharge duct where it is condensed by a heat exchanger and exhausted into the environment surrounding the device.

A process and system for treating a hydroprocessing unit effluent gas stream for recycling includes introducing the effluent gas stream into a hydrogen purification zone and recovering a hydrogen-rich gas stream and a liquid stream containing a mixture that includes C1 to C4 hydrocarbons and H.sub.2S which is then mixed with an oxidant and fed to an oxidation unit containing catalyst for conversion of the H.sub.2S to elemental sulfur vapors that is separated for recovery of the elemental sulfur, and recovering a sweetened mixture that includes C1 to C4 hydrocarbons. Alternatively, the hydroprocessing unit effluent gas stream containing H.sub.2S is cooled, contacted with a solvent to absorb the C1 to C4 hydrocarbons and H.sub.2S, with the hydrogen-rich stream being recovered for recycling to the hydroprocessing unit, and the rich liquid solvent being flashed to produce a lean solvent stream for recycling to the adsorption zone and a mixed gas stream that includes the C1 to C4 hydrocarbons and H.sub.2S that is passed to an oxidation zone and is reacted with an oxidant in the presence of a catalyst to complete the process as described above for the recovery of elemental sulfur and a mixture that includes the sweetened C1 to C4 hydrocarbons.

A process and system for treating a hydroprocessing unit effluent gas stream for recycling includes introducing the effluent gas stream into a hydrogen purification zone and recovering a hydrogen-rich gas stream and a liquid stream containing a mixture that includes C1 to C4 hydrocarbons and H.sub.2S which is then mixed with an oxidant and fed to an oxidation unit containing catalyst for conversion of the H.sub.2S to elemental sulfur vapors that is separated for recovery of the elemental sulfur, and recovering a sweetened mixture that includes C1 to C4 hydrocarbons. Alternatively, the hydroprocessing unit effluent gas stream containing H.sub.2S is cooled, contacted with a solvent to absorb the C1 to C4 hydrocarbons and H.sub.2S, with the hydrogen-rich stream being recovered for recycling to the hydroprocessing unit, and the rich liquid solvent being flashed to produce a lean solvent stream for recycling to the adsorption zone and a mixed gas stream that includes the C1 to C4 hydrocarbons and H.sub.2S that is passed to an oxidation zone and is reacted with an oxidant in the presence of a catalyst to complete the process as described above for the recovery of elemental sulfur and a mixture that includes the sweetened C1 to C4 hydrocarbons.

An object of the present invention is to provide a new frameless catalytic thermal oxidation device capable of treating concentrations of harmful materials including NOx at a low temperature. Further, another object of the present invention is to provide a frameless catalytic thermal oxidation device capable of minimizing the occurrence of THC and minimizing a risk of accidents and environmental pollution which may occur in maintenance operations. According to the objects, the present invention provides a cartridge-type thermal oxidation device capable of being separated for maintenance, wherein a cartridge internal structure is configured so that the time while the material to be treated stays in a zone with the catalyst is increased, and a member capable of dropping and collecting powder generated by thermal oxidation reaction is configured.

A flue gas treatment device is provided. A wet electrostatic precipitator and a flue gas heater are integrated in an integrated flue housing of the flue gas treatment device, thus the occupied area of the flue gas treatment device is smaller than that of the solution with devices being arranged separately. Furthermore, since a bidirectional transition flue is not required to be arranged in the integrated flue housing, the flue gas has a good flow uniformity, and further it is not required to arrange a flow equalization orifice plate in the flue, thus the flue gas has a small resistance, thereby reducing the power consumption of the draught fan and increasing the efficiency of the power plant.

A flue gas treatment device is provided. A wet electrostatic precipitator and a flue gas heater are integrated in an integrated flue housing of the flue gas treatment device, thus the occupied area of the flue gas treatment device is smaller than that of the solution with devices being arranged separately. Furthermore, since a bidirectional transition flue is not required to be arranged in the integrated flue housing, the flue gas has a good flow uniformity, and further it is not required to arrange a flow equalization orifice plate in the flue, thus the flue gas has a small resistance, thereby reducing the power consumption of the draught fan and increasing the efficiency of the power plant.