Method and device for treating NOx-containing flue gas

A treatment method and flue gas technology, applied in the direction of microorganism-based methods, separation methods, chemical instruments and methods, etc., can solve the problems of high investment costs, pollution, ammonia escape, etc., and achieve high carbon fixation efficiency and good removal effect , the effect of low processing cost

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

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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 NOx-containing flue gas
  • Method and device for treating NOx-containing flue gas
  • Method and device for treating NOx-containing flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) In a 10L photobioreactor, add the prepared cellulosic algae SS-B7 seed liquid and microalgae medium, the amount of microalgae medium added is 6L, and the amount of seed liquid added is 0.9L. 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 40%.

[0042] (2) After 7 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, the dry cell weight can...

Embodiment 2

[0046] (1) In a 10L photobioreactor, add the prepared cellulosic algae SS-B7 seed solution and microalgae medium, the amount of microalgae medium added is 6L, and the amount of seed solution added is 1.0L. 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. In the collected exhaust gas, CO 2 The removal rate is 75%, and the NO removal rate is 30%.

[0047] (2) After 8 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, the dry cell weigh...

Embodiment 3

[0051] (1) In a 10L photobioreactor, add the prepared cellulosic algae SS-B7 seed liquid and microalgae medium, the amount of microalgae medium added is 6L, and the amount of seed liquid added is 1.2L. Into the flue gas, CO in the flue gas 2 The content of NO is 40v%, the NO content is 0.05v%; the ventilation volume is 0.25vvm. 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 55%, and the NO removal rate is 20%.

[0052] (2) After 8 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, the dry cell weight can re...

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Abstract

The invention relates to a method for treating NOx-containing flue gas, comprising the following steps: (1) introducing flue gas into a photobioreactor for microalgae culture, and collecting exhaust gas, wherein microalgae is NOx-tolerant microalgae; (2) carrying out solid-liquid separation on the culture system in the step (1) to obtain microalgae cells and a filtrate separately; (3) adding sodium peroxide into the filtrate obtained in the step (2), and introducing the exhaust gas obtained in the step (1) into the filtrate for treatment to obtain purified gas; and (4) carrying out denitrification treatment on the filtrate treated in the step (3). The invention also provides a device for treating the NOx-containing flue gas. The method and device mainly adopt a biological method to removeCO2 and NOX in the flue gas, do not need to use a catalyst and 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 treatment method and device for flue gas containing NOx. 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 Development a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/56C12N1/12C12R1/89
CPCY02P20/59Y02A50/20
Inventor 赵磊师文静王筱喃
Owner CHINA PETROLEUM & CHEM CORP
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