Process method for removing heavy metal lead in exhaust gas
A process method and heavy metal technology, applied in separation methods, chemical instruments and methods, gas treatment and other directions, can solve the problems of difficult capture and removal of gaseous lead, and achieve the effect of improving adaptability and good solubility
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Embodiment example 1
[0028] The flue gas emitted by a 130t / h coal-fired steam boiler in a factory in Luzhou, Sichuan, the flue gas volume in the pipeline is 158627m 3 / h, the lead content in the flue gas is 33.42μg / Nm 3 . In this embodiment, the existing flue chimney is used as the fixed bed adsorption oxidation space, and sodium bicarbonate is used as the adsorption oxidant, and its consumption is 20000h according to the air velocity of the flue gas. -1 To determine, oxidized sodium carbonate and unoxidized sodium bicarbonate are used as the spray liquid of the spray tower, and the lead in the flue gas is removed through the contact reaction between the spray liquid and the flue gas. The specific removal operation is as follows:
[0029] (1) Fixed bed adsorption and oxidation: After grinding commercially available sodium bicarbonate, the sodium-based absorbent powder with a particle size of 150 μm obtained by screening is placed in a fixed bed in the flue gas pipeline, and the fixed bed is set ...
Embodiment example 2
[0033] The flue gas emitted by a 130t / h coal-fired steam boiler in a factory in Luzhou, Sichuan, the flue gas volume in the pipeline is 138167m 3 / h, the lead content in the flue gas is 37.56μg / Nm 3 . In this embodiment, the existing flue chimney is used as the fixed bed adsorption and oxidation space, and sodium bicarbonate is used as the adsorption oxidant, and its consumption is 24500h according to the air velocity of the flue gas. -1 To determine, oxidized sodium bicarbonate and unoxidized sodium bicarbonate are used as the spray liquid of the spray tower, and the lead in the flue gas is removed through the contact reaction between the spray liquid and the flue gas. The specific removal operation is as follows:
[0034] (1) Fixed bed adsorption and oxidation: After grinding commercially available sodium bicarbonate, the sodium-based absorbent powder with a particle size of 50 μm obtained by screening is placed in a fixed bed in the flue gas pipeline, and the fixed bed la...
Embodiment example 3
[0038] The flue gas emitted by a 130t / h coal-fired steam boiler in a factory in Luzhou, Sichuan, the flue gas volume in the pipeline is 153449m 3 / h, the lead content in the flue gas is 38.30μg / Nm 3 . In this embodiment, the existing flue chimney is used as the fixed bed adsorption and oxidation space, and sodium bicarbonate is used as the adsorption oxidant, and its consumption is 30000h according to the air velocity of the flue gas. -1 To determine, oxidized sodium bicarbonate and unoxidized sodium bicarbonate are used as the spray liquid of the spray tower, and the lead in the flue gas is removed through the contact reaction between the spray liquid and the flue gas. The specific removal operation is as follows:
[0039] (1) Fixed bed adsorption and oxidation: After grinding commercially available sodium bicarbonate, the sodium-based absorbent powder with a particle size of 10 μm obtained by screening is placed in a fixed bed in the flue gas pipeline, and the fixed bed is...
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