LU500071B1 - Supergravity Reinforced Method for Removal of NOx with Composite Absorption Liquid - Google Patents

Supergravity Reinforced Method for Removal of NOx with Composite Absorption Liquid Download PDF

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Publication number
LU500071B1
LU500071B1 LU500071A LU500071A LU500071B1 LU 500071 B1 LU500071 B1 LU 500071B1 LU 500071 A LU500071 A LU 500071A LU 500071 A LU500071 A LU 500071A LU 500071 B1 LU500071 B1 LU 500071B1
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LU
Luxembourg
Prior art keywords
nox
removal
composite absorption
supergravity
absorption liquid
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Application number
LU500071A
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German (de)
Inventor
Guoqing Ren
Xin Yang
Jiyun Gao
Lijuan Jia
Tiancheng Liu
Fang Wang
Rui Li
Kaijiao Duan
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Univ Yunnan Minzu
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Priority to LU500071A priority Critical patent/LU500071B1/en
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Publication of LU500071B1 publication Critical patent/LU500071B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/79—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/106—Peroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/108—Halogens or halogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

A supergravity reinforced method for removal of NOx with composite absorption liquid. The method utilizes supergravity technology to reinforce the removal of NO with low oxidation degree and concentration from flue gas with three composite absorption liquids: CaO+H2O2, Ca(OH)2+H2O2 and CO(NH2)2+NaClO. The volume fraction of NO is 0.5%. The simulated flue gas is composed of NO, O2 and N2 (balance gas), and reacts in a rotating packed bed (RPB) in a countercurrent form. During reaction, the mixed liquid of CaO and H2O2, the mixed liquid of Ca2(OH)2 and H2O2, and the mixed liquid of CO(NH2)2 and NaClO are adopted as the composite absorption liquids to absorb NOx. The method can achieve a NOx removal rate of 70%-96%, and the absorption products are NO3- and NO2- . The method is a green, efficient, energy-saving and economical (NOx) removal technology, can effectively remove NOx under a supergravity environment and has high removal efficiency.

Description

DESCRIPTION Supergravity Reinforced Method for Removal of NO, with Composite Absorption Liquid
TECHNICAL FIELD The invention relates to a supergravity reinforced method for removal of NOx with a composite absorption liquid, and belongs to the technical field of air pollution control.
BACKGROUND NOx includes NO, NO», N2O5, N204, etc., and causes environmental problems such as photochemical smoke, acid rain, and ozone layer destruction. The selective catalytic reduction technology has high operation cost, and a waste denitration catalyst is regarded as hazardous waste by the Ministry of Environmental Protection in 2015 and is managed in a unified manner. Nowadays, it is necessary to study efficient and effective denitration technology to ensure the sustainable development of coal-burning industry.
The denitration adopting the supergravity technology uses absorption liquid to wash the flue gas, and absorb for denitrification, has the advantages of a simple process, a high removal rate, low cost, environmental protection, and the like. CaO and Ca(OH). are inexpensive and easily available.
SUMMARY The objective of the invention is to provide a supergravity reinforced method for removal of NOx with a composite absorption liquid, which can effectively solve the problem of NOx by using the supergravity technology to strengthen the absorption of NOx by the composite absorption liquid, and is a green, efficient, energy-saving and economical denitration method. NO (N2 being used as balance gas) with the volume fraction of 0.05%, Oz and Nz enter a gas distribution tank, and then pass into a rotating packed bed after being uniformly mixed.
NO, O2 and Na are adjusted in flow rate by a mass flow controller, and are introduced to a gas distribution cylinder to prepared flue gas of a needed concentration; a reactor power supply is started for adjusting rotation speed, and a peristaltic pump is arranged for introducing the flue gas from the rotating packed bed after flow of the flue gas and the absorption liquid is stable, so that the absorption liquid enters from an inlet of the rotating packed bed, and the reacted absorption liquid flows into an absorption liquid bottle from a liquid outlet of a reactor. After a period of reaction, flue gas analyzer is adopted for detecting the concentration of the NOx and calculating the denitration rate of the NOx before and after flue gas reaction.
In the invention, the alkali liquor is CaO having a molar concentration of
0.02 mol/L and Ca(OH)2 having a molar concentration of 0.03 mol/L.
In the invention, the salt is CO(NH2)2 having a molar concentration of 0.05 mol/L.
In the invention, the acid is H2O2 having a molar concentration of 0.03 mol/L and H>O> having a molar concentration of 0.05 mol/L.
In the invention, the rotation speed is 900 r/min.
BRIEF DESCRIPTION OF THE FIGURES Fig. 1 is a schematic diagram of an experimental flow chart, where 1 is NO, 2 is Oz, 3 is N2, 4 is a mass flow meter, 5 is a gas distribution cylinder, 6 is a rotating packed bed, 7 is an absorption liquid, 8 is a peristaltic pump, 9 is a drying tube and 10 is a flue gas analyzer.
DESCRIPTION OF THE INVENTION The invention will be described in detail below in conjunction with experimental flow charts and implementation examples.
Example 1: the flue gas containing NO, O2 and Na was introduced into a rotating packed bed reactor 8, where the volume fraction of NO was 0.05%, the flow velocity of NO was 15 mL/min, the flow velocity of O2 was 18 mL/min and the flow velocity of Na was 267 mL/ min; the prepared 0.02 mol/L CaO+0.03 mol/L H2O2 composite absorption liquid was introduced into the reactor by a peristaltic pump 7 at a flow velocity of 100 mL/min; a gas phase and a liquid phase were in sufficient contact in the countercurrent form at a rotation speed of 900 r/Min, and a gas-liquid two-phase mass transfer two-phase mass transfer process was reinforced by gas-liquid great shearing force generated during rotation and a fast updated phase interface, where a gas-liquid ratio (V:V) was 3:1; a 5L sampling bag was adopted for collecting NOx, and the flue gas analyzer was adopted for detecting NOx before and after reaction; experiment was carried out by three times to ensure data accuracy. It had been determined that a denitration rate was 96.84%, which met the national emission standards.
Example 2: the flue gas containing NO, O2 and Na was introduced into a rotating packed bed reactor 8, where the volume fraction of NO was 0.05%, the flow velocity of NO was 15 mL/min, the flow velocity of O2 was 18 mL/min and the flow velocity of Na was 267 mL/ min; the prepared 0.03 mol/L Ca(OH)+0.05 mol/L H2O2 composite absorption liquid was introduced into the reactor by a peristaltic pump 7 at a flow velocity of 100 mL/min; a gas phase and a liquid phase were in sufficient contact in countercurrent form at a rotation speed of 900 r/min, and a gas-liquid two-phase mass transfer two-phase mass transfer process was reinforced by gas-liquid great shearing force generated during rotation and a fast updated phase interface, where a gas-liquid ratio (V:V) was 3:1; a 5L sampling bag was adopted for collecting NOx, and the flue gas analyzer was adopted for detecting NOx before and after reaction; experiment was carried out by three times to ensure data accuracy. It had been determined that a denitration rate was 97.17%, which met the national emission standards.
Example 3: the flue gas containing NO, O2 and Na was introduced into a rotating packed bed reactor 8, where the volume fraction of NO was 0.05%, the flow velocity of NO was 15 mL/min, the flow velocity of O2 was 18 mL/min and the flow velocity of Na was 267 mL/ min; the prepared 0.05 mol/L CO(NH2)+0.2 mol/L NaCIO composite absorption liquid was introduced into the reactor by a peristaltic pump 7 at a flow velocity of 100 mL/min; a gas phase and a liquid phase were in sufficient contact in countercurrent form at a rotation speed of 900 r/min, and a gas-liquid two-phase mass transfer two-phase mass transfer process was reinforced by gas-liquid great shearing force generated during rotation and a fast updated phase interface, where a gas-liquid ratio (V:V) was 3:1; a 5L sampling bag was adopted for collecting NOx, and the flue gas analyzer was adopted for detecting NOx before and after reaction; experiment was carried out by three times to ensure data accuracy. It had been determined that a denitration rate was 58.48%, which met the national emission standards.

Claims (6)

1. À supergravity reinforced method for removal of NO, with a composite absorption liquid, wherein a 0.02 mol/L CaO+0.03 mol/L H2O2 composite absorption liquid is prepared; the simulated flue gas at a flow velocity of 0.3 L/min is introduced into a gas inlet of the rotating packed red, and the composite absorption liquid enters a rotating packed red reactor from a liquid inlet to perform gas-liquid two-phase reaction.
2. A supergravity reinforced method for removal of NOx with a composite absorption liquid, wherein a 0.03 mol/L Ca(OH)+0.05 mol/L H202 composite absorption liquid is prepared; the simulated flue gas at a flow velocity of 0.3 L/min is introduced into a gas inlet of the rotating packed red, and the composite absorption liquid enters a rotating packed red reactor from a liquid inlet to perform gas-liquid two-phase reaction.
3. A supergravity reinforced method for removal of NOx with a composite absorption liquid, wherein a 0.05 mol/L CO(NH2)2+0.2mol/LNaClO composite absorption liquid is prepared; the simulated flue gas at a flow velocity of 0.3 L/min is introduced into a gas inlet of the rotating packed red, and the composite absorption liquid enters a rotating packed red reactor from a liquid inlet to perform gas-liquid two-phase reaction.
4. The supergravity reinforced method for removal of NOx with the composite absorption liquid according to claim 1, wherein the rotation speed is 900 r/min.
5. The supergravity reinforced method for removal of NOx with the composite absorption liquid according to claim 1, wherein the gas rotation speed is 0.3 L/ min.
6. The supergravity reinforced method for removal of NO, with the composite absorption liquid according to claim 1, wherein liquid rotation speed is 0.1 L/ min.
LU500071A 2021-04-22 2021-04-22 Supergravity Reinforced Method for Removal of NOx with Composite Absorption Liquid LU500071B1 (en)

Priority Applications (1)

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LU500071A LU500071B1 (en) 2021-04-22 2021-04-22 Supergravity Reinforced Method for Removal of NOx with Composite Absorption Liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU500071A LU500071B1 (en) 2021-04-22 2021-04-22 Supergravity Reinforced Method for Removal of NOx with Composite Absorption Liquid

Publications (1)

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Effective date: 20211022