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Method of removing multiple pollutants in flue gas through low-temperature gas-like phase catalytic oxidization

A gas-phase catalytic oxidation and catalytic oxidation technology, which is applied in the field of flue gas purification, can solve the problems of single liquid oxidant oxidation ability catalyst activity difference, oxidant consumption unsatisfactory removal efficiency, chlorine-containing oxidant consumption equipment corrosion, etc., to achieve electronic The effect of accelerating the transfer speed, saving investment and operating costs, and reducing catalyst costs

Active Publication Date: 2017-07-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN103463978A and CN105536529A disclose two kinds of using liquid H 2 o 2 Contact with metal oxides to generate hydroxyl radicals to achieve simultaneous desulfurization and denitrification, but it is limited by the insufficient oxidation capacity of a single liquid oxidant and the difference in the activity of the catalyst used, the consumption of the oxidant and the NO X The removal efficiency is not ideal
CN105727724A discloses a method and device for simultaneous desulfurization, denitrification, demercury and decarburization of sodium hypochlorite by light radiation. The sodium hypochlorite is irradiated with ultraviolet light to generate chlorine atoms and hydroxyl radicals. Although the resulting removal efficiency is high, the amount of chlorine-containing oxidant used is too much It is easy to cause equipment corrosion, and the energy consumption of ultraviolet light is high

Method used

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  • Method of removing multiple pollutants in flue gas through low-temperature gas-like phase catalytic oxidization
  • Method of removing multiple pollutants in flue gas through low-temperature gas-like phase catalytic oxidization
  • Method of removing multiple pollutants in flue gas through low-temperature gas-like phase catalytic oxidization

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Effect test

Embodiment 1

[0069] With 5%wt hydrogen peroxide solution as oxidant, molecular sieve loaded with nanometer zero-valent iron as catalyst, the space velocity is 152866h -1 Under the conditions, the liquid-phase oxidant is injected into the generating device, and under the condition of controlling the temperature of the loop pipe and the catalyst bed at 120 and 110 °C respectively, the mixed solution of potassium humate and ammonia water is used as the absorption liquid to conduct simultaneous desulfurization, denitrification and demercuration experiments. Detected: SO 2 The removal efficiency is 98.8%, the denitrification efficiency is 90.2%, and the mercury removal efficiency is over 90.1%.

Embodiment 2

[0071] With 10%wt hydrogen peroxide and 0.1wt% peracetic acid solution as the oxidant, molecular sieve loaded with nanometer zero-valent iron as the catalyst, the space velocity is 198726h -1 Under the conditions, the liquid-phase oxidant is injected into the generating device, and the temperature of the loop pipe and the catalyst bed are controlled at 140 and 130 °C respectively, and the mixed solution of potassium humate and ammonia water is used as the absorption liquid to conduct simultaneous desulfurization, mercury and denitrification experiments. Detected: SO 2 The removal efficiency is 99.5%, the denitrification efficiency is 91.4%, and the mercury removal efficiency is over 92.7%.

Embodiment 3

[0073] With 15%wt hydrogen peroxide and 2wt% potassium hypochlorite solution as the oxidant, molecular sieve loaded with nanometer zero-valent iron as the catalyst, the space velocity is 229299h -1 Under the conditions, the liquid-phase oxidant is injected into the generating device, and under the condition of controlling the temperature of the loop pipe and the catalyst bed at 160 and 150 °C respectively, the mixed solution of potassium humate and ammonia water is used as the absorption liquid to conduct simultaneous desulfurization, mercury and denitrification experiments. Detected: SO 2 The removal efficiency is 99.8%, the denitrification efficiency is 93.2%, and the mercury removal efficiency is above 93.8%.

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Abstract

The invention discloses a method of removing multiple pollutants in flue gas through low-temperature gas-like phase catalytic oxidization and belongs to the technical field of flue gas purification. According to the method, a liquid-phase oxidant is activated into a gas-like phase by means of flue gas temperature, and the gas-like phase oxidant generates strong-oxidizing free radicals under effects of a catalyst; the multiple pollutants in flue gas are catalytically oxidized into soluble valences by the strong-oxidizing free radicals, wherein an oxidizing product is absorbed by an absorbent in a spray column, thereby achieving integrated removal of the soluble multiple pollutants. A high-active low-temperature catalyst is prolonged in service life, reduces consumption on the oxidant and saves investment and operation cost. The absorption product is high in content of nitrogen and sulfur, so that the product can be processed into a compound fertilizer raw material. The method can reach 99-100%, 90-95% and 90-95% in removal rates respectively on SO2, NO and Hg<0>, is suitable for boilers in various types and other flue gas purification fields, and has excellent economic and promotion value.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a method for removing multi-pollutants from flue gas through low-temperature gas-phase catalytic oxidation. Background technique [0002] In recent years, including SO 2 , NO x and trace heavy metals (Hg 0 ) including coal-fired flue gas pollutants has become the main factor restricting the rapid and sustainable development of my country's national economy, and it is also one of the causes of frequent occurrence of smog in the Beijing-Tianjin-Hebei region. Governance is imperative. Traditionally, the mainstream desulfurization and denitrification processes in coal-fired power plants are wet desulfurization (WFGD) and selective catalytic reduction (SCR). adsorption removal. Generally speaking, the above-mentioned hierarchical treatment method has defects such as large area occupation, complex system and high operating costs, and the products have seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/14B01D53/60B01D53/64
CPCB01D53/14B01D53/60B01D53/64B01D53/86B01D53/8609B01D53/8625B01D53/8628B01D53/8665B01D2252/50B01D2252/102B01D2252/20B01D2251/108B01D2251/70B01D2251/106B01D2258/0283B01D2257/602B01D2257/404B01D2257/302Y02A50/20
Inventor 赵毅袁博郝润龙陶子晨
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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