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Method and device for treating flue gas containing nitrogen oxides

A technology of nitrogen oxides and flue gas, applied in the direction of microorganism-based methods, chemical instruments and methods, biochemical cleaning devices, etc., can solve problems such as pollution, high investment costs, ammonia escape, etc., to avoid poisoning and improve carbon sequestration Efficiency, effect of increasing solubility

Active Publication Date: 2019-06-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction still needs to be carried out at a relatively high temperature in the presence of a catalyst, and there are problems such as ammonia escape.
[0004] The flue gas denitrification processes disclosed in Chinese patents CN103768903A, CN103768932A, and CN103768934A require a flue gas temperature of 300-400°C, and large-scale transformation of the boiler requires high investment costs.
However, the catalyst prepared by the invention belongs to the vanadium-tungsten series catalyst, and ammonium metavanadate becomes V after calcining. 2 o 5 , V 2 o 5 It is a highly toxic substance that will cause serious pollution during production and use

Method used

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  • Method and device for treating flue gas containing nitrogen oxides
  • Method and device for treating flue gas containing nitrogen oxides
  • Method and device for treating flue gas containing nitrogen oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) In a 10L photobioreactor, add 6L of the prepared microalgae culture medium, adjust the pH of the microalgae culture medium to 10 with NaOH, and insert 0.9L of Pseudochlorella kelvinia FSH-Y3 seed liquid for cultivation. Into the flue gas, CO in the flue gas 2 The content of NO is 5v%, the NO content is 0.03v%, and the ventilation volume is 0.5vvm. The light intensity for cultivation was 5000Lux, the cultivation temperature was 25°C, the light cycle was 24h, and the light-dark time ratio was 14:10. In the collected exhaust gas, CO 2 The removal rate is 85%, and the NO removal rate is 80%.

[0043] (2) After 5 days of culture, microalgae cells and filtrate were harvested by centrifugation. Determine dry cell weight and lipid content. After vacuum freeze-drying at -60°C to constant weight, the dry weight of the algae powder was measured, the biomass production was calculated, and the total lipid content was measured by the n-hexane: ethyl acetate method. After tes...

Embodiment 2

[0046] (1) In a 10L photobioreactor, 6L of the prepared microalgae medium was added, the pH of the microalgae medium was adjusted to 11 with NaOH, and 1.0L of Pseudochlorella kelvinii FSH-Y3 seed liquid was added for cultivation. Into the flue gas, CO in the flue gas 2 The content of NO is 10v%, the NO content is 0.05v%, and the ventilation volume is 0.5vvm. The light intensity for cultivation was 5000Lux, the cultivation temperature was 25°C, the light cycle was 24h, and the light-dark time ratio was 14:10. CO in collected exhaust gas 2 The removal rate is 80%, and the NO removal rate is 75%.

[0047] (2) After 6 days of culture, microalgae cells and filtrate were harvested by centrifugation. Determine dry cell weight and lipid content. After vacuum freeze-drying at -60°C to constant weight, the dry weight of the algae powder was measured, the biomass production was calculated, and the total lipid content was measured by the n-hexane: ethyl acetate method. After testing,...

Embodiment 3

[0050] (1) In a 10L photobioreactor, add 6L of the prepared microalgae culture medium, adjust the pH of the microalgae culture medium to 12 with NaOH, insert 1.2L of Pseudochlorella kelvinia FSH-Y3 seed liquid for cultivation. Into the flue gas, CO in the flue gas 2 The content of NO is 40v%, the NO content is 0.05v%, and the ventilation volume is 0.3vvm. The light intensity for cultivation was 5000Lux, the cultivation temperature was 25°C, the light cycle was 24h, and the light-dark time ratio was 14:10. CO in collected exhaust gas 2 The removal rate is 60%, and the NO removal rate is 75%.

[0051] (2) After 6 days of culture, microalgae cells and filtrate were harvested by centrifugation. Determine dry cell weight and lipid content. After vacuum freeze-drying at -60°C to constant weight, the dry weight of the algae powder was measured, the biomass production was calculated, and the total lipid content was measured by the n-hexane: ethyl acetate method. After testing, th...

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Abstract

The invention relates to a method for treating flue gas containing nitrogen oxides, which comprises the following steps: (1) introducing flue gas into a photobioreactor for microalgae culture, keepingthe pH of a microalgae culture medium not less than 9, then introducing microalgae with high-pH tolerance, and collecting exhaust gas; (2) carrying out solid-liquid separation on the culture system in the step (1), and separately harvesting microalgae cells and a filtrate; and (3) inoculating denitrifying bacteria into the filtrate, and introducing the exhaust gas in the step (1) for denitrification treatment to obtain purified gas. The invention also provides a device for treating the flue gas containing nitrogen oxides. The method and device mainly adopt a biological method to remove CO2 and NOX in the flue gas, do not need to use a catalyst or a large number of chemical reagents, and have the advantages of good removal effect, low treatment cost, economy, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a method and device for treating flue gas containing nitrogen oxides. Background technique [0002] Nitrogen oxides (NOx) have N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other forms, and can cause a variety of hazards, such as photochemical smog can be produced with volatile organic compounds (VOC) in the atmosphere, which can cause strong irritation to the eyes and throat, and cause headaches and respiratory diseases. cause death. my country's NOx emissions have exceeded 20 million tons for many years in a row, 21.94 million tons in 2010, 24.043 million tons in 2011, 23.378 million tons in 2012, 22.273 million tons in 2013, and 20.78 million tons in 2014. In recent years, it has shown a continuous downward trend, but its pollution situation is still serious. On September 12, 2014, three ministries and commissions including the National De...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/56B01D53/62C12N1/12C12M1/04C12P3/00C12R1/89
CPCY02P20/151Y02P20/59Y02A50/20Y02C20/40
Inventor 赵磊师文静刘洋
Owner CHINA PETROLEUM & CHEM CORP
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