Process method for removing heavy metal lead in flue gas
A process method and heavy metal technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of difficult capture and removal of gaseous lead, and achieve the goal of overcoming secondary solid waste pollution, improving adaptability and solubility Good results
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Embodiment example 1
[0036] 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:
[0037] (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
[0041] 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:
[0042] (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
[0046] 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:
[0047] (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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Abstract
in flue gas, gaps of sodium carbonateobtained by pyrolysis reaction of the sodium bicarbonate and the flue gas are applied to absorb particulate lead Pb
, and active oxidizing substances produced by oxidation reaction are used to convert elemental lead Pb<0> in the flue gas into oxidized lead Pb<2+>. The mixture prepared by sodium bicarbonate and pyrolytically oxidized sodium bicarbonate with water is used as spray liquid to fullycontact with the flue gas to remove oxidized lead Pb<2+> and unremoved particles Pb
in step (1) and a small amount of elemental Pb<0> from the flue gas. Compared with the existing traditional leadremoval process, the process method remedies the shortcomings of the conventional process method which generally has low lead removal efficiency, and the spray operation process has no risk of scaling and clogging, is insensitive to flue gas fluctuation, and the device has good adaptability, overcoming the problem of secondary sewage and secondary solid waste pollution caused by wet method, and having good economic and environmental benefits.
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