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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

Inactive Publication Date: 2019-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the existing flue gas deleading technology, and provide a new process for removing heavy metal lead in flue gas, so as to realize the removal of lead in flue gas under low temperature conditions and solve the problem of flue gas Difficulty in trapping and removing medium gaseous lead

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention discloses a process method for removing heavy metal lead in exhaust gas. The process method comprises the following steps: adopting sodium bicarbonate as a bed layer for absorbing particle-state lead Pbp in the exhaust gas, adsorbing the particle-state lead Pbp by utilizing the gap of sodium carbonate obtained through a pyrolytic reaction between sodium bicarbonate and exhaust gas, and translating element-state lead Pb<0> in the exhaust gas into oxidation-state lead Pb<2+> by utilizing the active oxide matter produced through oxidation reaction, and taking a mixed solution prepared by adding water into sodium bicarbonate and oxidized sodium bicarbonate after pyrolytic adsorption as a spraying solution to sufficiently contact with the exhaust gas to remove the oxidation-statelead Pb<2+> in the exhaust gas and the particle-state Pbp which is not removed in the previous step and less element-state Pb<0>. Compared with the traditional lead removing process, the defect that the traditional process method is generally low in lead removing efficiency is remedied; a spraying operation running process is free from scaling and blocking risk, the process method is insensitive to the exhaust gas fluctuation, and the device adaptability is good; the problems of the denounced secondary sewage and secondary solid-waste pollution of the wetting method are overcome, and the process method has good economic benefits and environment benefits.

Description

technical field [0001] The invention relates to the technical field of atmospheric environmental protection flue gas purification, in particular to a process method for removing heavy metal lead in flue gas. Background technique [0002] Lead is a poisonous substance that is harmful to the environment and nerves. When lead enters the blood of the body, it will hinder the synthesis of hemoglobin and cause anemia; lead poisoning can also cause vasospasm, peptic ulcer and retinal hemorrhage; Children's growth and development, walking inconvenience and insomnia and other symptoms. At present, there are two main sources of lead pollution in the atmosphere, one is the development of natural mineral resources mainly based on galena (PbS), and the other is emissions from fossil fuel combustion, industrial production, living and transportation, among which coal-burning emissions are considered to be the most important source of lead pollution. In recent years, with the rapid develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64B01D53/82B01D53/50B01D53/56
CPCB01D53/501B01D53/504B01D53/508B01D53/56B01D53/64B01D53/82B01D2257/302B01D2257/404B01D2257/60B01D2258/0283
Inventor 李建军马晓文郭家秀刘勤岑望来刘勇军楚英豪袁山东
Owner SICHUAN UNIV
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