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A device and method for photocatalytic oxidation removal of multiple pollutants in flue gas

A catalytic and pollutant-promoting technology, applied in the field of flue gas purification, can solve problems such as poor water solubility and low denitrification efficiency

Active Publication Date: 2017-11-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of power production, 90-95% of NOx in coal-fired flue gas is NO, which has poor water solubility and cannot be absorbed by absorbents, resulting in low denitrification efficiency, while NO 2 , NO 3 and N 2 O5 etc. are highly soluble in water; therefore, realizing the rapid oxidation of NO in the gas phase is the key to denitrification

Method used

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  • A device and method for photocatalytic oxidation removal of multiple pollutants in flue gas
  • A device and method for photocatalytic oxidation removal of multiple pollutants in flue gas
  • A device and method for photocatalytic oxidation removal of multiple pollutants in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Compound oxidant solution: H 2 o 2 The mass concentration is 50wt%, and the pH is 6.

[0072] The above-mentioned liquid-phase composite oxidant is injected into the flue gas waste heat utilization and atomization generating device 2, and after passing through the photocatalytic activation reaction device 3 and the absorption device 5, the integrated desulfurization, denitrification and mercury removal are realized. The reaction conditions are shown in Table 2.

[0073] Table 2

[0074] Reaction conditions

[0075] According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 100%, the denitrification efficiency is 87%, and the mercury removal efficiency is over 92.1%.

Embodiment 2

[0077] Compound oxidant solution: H 2 o 2 The mass concentration ratio of NaBr and NaBr is 40:0.05, and the pH is 5.5.

[0078] The above-mentioned liquid-phase composite oxidant is injected into the flue gas waste heat utilization and atomization generating device 2, and after passing through the photocatalytic activation reaction device 3 and the absorption device 5, the integrated desulfurization, denitration and demercuration is realized. The reaction conditions are shown in Table 3.

[0079] table 3

[0080]

[0081]

[0082]According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 99%, the denitrification efficiency is 88.7%, and the mercury removal efficiency is over 94.7%.

Embodiment 3

[0084] Compound oxidant solution: H 2 o 2 The mass concentration ratio of NaCl and NaCl is 40:0.5, and the pH is 5.

[0085] The above-mentioned liquid-phase composite oxidant is injected into the flue gas waste heat utilization and atomization generating device, and after passing through the photocatalytic activation reaction device and the absorption device, the integrated desulfurization, denitrification and demercuration are realized. The reaction conditions are shown in Table 4.

[0086] Table 4

[0087]

[0088]

[0089] According to the above conditions, the flue gas is desulfurized, demercurized and denitrified, and it is detected that: SO 2 The removal efficiency is 99%, the denitrification efficiency is 86.4%, and the mercury removal efficiency is over 93.5%.

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Abstract

The invention relates to a device and method for removing various pollutants in flue gas through photoassisted catalytic oxidization. Flue gas waste heat utilizing and atomizing generation device is arranged in a pipeline between an air pre-heater and an electrostatic dust remover and is of a structure that a small pipe is sleeved with a large pipe; the large pipe is used for conveying a composite oxidization agent; compressed air in the small pipe makes the composite oxidization agent in a boiling state; meanwhile, hot flue gas and the composite oxidization agent exchange heat so that the composite oxidization agent can be atomized into ultrafine liquid drops; the atomized composite oxidization agent enters a photoassisted catalysis and activation reaction device to be catalyzed and activated, various free radicals are generated and ejected out of an outlet of the photoassisted catalysis and activation reaction device and make contact with flue gas with dust removed, NO in the flue gas is converted into high-valence-state NOx, HgO is oxidized into Hg2+, NOx, Hg2+ and SO2 enter an absorbing device along with the flue gas and are absorbed and removed, efficient and synergistic desulfurization, denitration and mercury removal are achieved, removed products are high-quality compound fertilizer, resource utilization is facilitated, and high economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a device and method for removing multiple pollutants in flue gas by photocatalytic oxidation. Background technique [0002] my country's air pollution is a typical soot-type pollution, in which sulfur dioxide, nitrogen oxides and heavy metals are the symbolic pollutants of coal-burning flue gas, sulfur dioxide and nitrogen oxides are the main sources of acid rain, and nitrogen oxides are also the cause of photochemical smog. One of the most important precursors, and elemental mercury has the characteristics of strong toxicity, stable form and difficult biodegradation. In recent years, due to the significant increase in emissions of sulfur dioxide, nitrogen oxides, and heavy metals in coal-fired flue gas, frequent smog has occurred in my country, seriously endangering people's health and the ecological environment. [0003] The mainstream flue gas desulfurization tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/56B01D53/64B01D53/78B01D53/50B01D50/00B01D53/60F23J15/02
CPCB01D50/00B01D53/502B01D53/60B01D53/64B01D53/75B01D53/8628B01D53/8665B01D2251/106B01D2251/1065B01D2251/306B01D2255/2027B01D2255/70B01D2255/707B01D2255/802B01D2259/124F23J15/02F23J2215/10F23J2215/101F23J2215/20F23J2219/10Y02A50/20
Inventor 郝润龙赵毅袁博
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)