Smoke denitrification method and equipment utilizing same

A treatment method and flue gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as difficult to apply in small and medium-scale industrial environments, complex processes, etc., to eliminate the possibility of secondary pollution , Simplify the process flow, the effect of small radius

Inactive Publication Date: 2011-09-07
李雪梅 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can complete the desulfurization and denitrification treatment of flue gas, the process is complex and requires

Method used

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  • Smoke denitrification method and equipment utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ferrous sulfate (FeSO 4 ) Dissolved in water to make Fe 2+ The concentration is 3.0g / L, and Fe 2+ Aqueous solution.

[0023] use figure 1 In the equipment shown, the above-mentioned aqueous solution is added to the liquid storage tank 5, and the circulating device 4 is used to transport it to the aerosol mixer 2, and spray it through a high-efficiency atomizing nozzle; the flue gas containing nitrogen oxides is discharged from the flue gas channel 1. Flow into the aerosol mixer 2 to fully contact the metal cations with nitrogen oxides to generate complex products. The reaction formula is (take NO as an example):

[0024] NO+FeSO 4 =Fe(NO)SO 4

[0025] The complex product decomposes under acidic conditions to generate nitrogen and metal cations, and the reaction formula is:

[0026] 2Fe(NO)SO 4 +H 2 SO 4 =Fe 2 (SO 4 ) 3 +N 2 ↑+H 2 O

[0027] Among them, the gas flow rate in the aerosol mixer is 3m / s, the reaction time of the aerosol mixer is 3.5 seconds, the airflow distribution...

Embodiment 2

[0030] Copper sulfate (CuSO 4 ) Dissolved in water to make Cu 2+ The concentration is 2.5g / L, and Cu is prepared 2+ Aqueous solution, set aside.

[0031] use figure 1 In the equipment shown, the above-mentioned aqueous solution is added to the liquid storage tank 5, and is transported to the aerosol mixer 2 by a circulating device, and sprayed through a high-efficiency atomizing nozzle; the flue gas containing nitrogen oxides flows into the flue gas channel 1 The aerosol mixer 2 makes the metal cations fully contact with nitrogen oxides to generate complex products. The reaction formula is (take NO as an example):

[0032] NO+CuSO 4 =Cu(NO)SO 4

[0033] The complex product decomposes under acidic conditions to generate nitrogen and metal cations, and the reaction formula is:

[0034] 2Cu(NO)SO 4 +H 2 SO 4 =CuSO 4 +N 2 ↑+H 2 O

[0035] The gas flow rate in the aerosol mixer is 4m / s, the reaction time of the aerosol mixer is 3 seconds, the airflow distribution of the aerosol mixer is un...

Embodiment 3

[0038] Add aluminum sulfate (Al 2 (SO 4 ) 3 ) Dissolved in water to make Al 3+ The concentration is 3.3g / L, and Al 3+ Aqueous solution, set aside.

[0039] use figure 1 In the equipment shown, the above-mentioned aqueous solution is added to the liquid storage tank 5, and is transported to the aerosol mixer 2 by a circulating device, and sprayed through a high-efficiency atomizing nozzle; the flue gas containing nitrogen oxides flows into the flue gas channel 1 The aerosol mixer 2 makes the metal cations fully contact with nitrogen oxides to generate complex products. The reaction formula is (take NO as an example):

[0040] 2NO+Al 2 (SO 4 ) 3 =Al 2 (NO) 2 (SO 4 ) 3

[0041] The complex product decomposes under acidic conditions to generate nitrogen and metal cations, and the reaction formula is:

[0042] Al 2 (NO) 2 (SO 4 ) 3 +H 2 SO 4 =Al 2 (SO 4 ) 3 +N 2 ↑+H 2 O

[0043] The gas flow rate in the aerosol mixer is 3.5m / s, the reaction time of the aerosol mixer is 3.2 seconds, the air...

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Abstract

The invention provides a smoke denitrification method, comprising the following steps: after a metal cation aqueous solution serving as a complexing absorbent is atomized, spraying smoke containing nitric oxide to generate a nitric oxide complex; and decomposing the generated nitric oxide complex into nitrogen and metal cations under the acidic condition. The invention also provides smoke denitrification equipment using the method. In the method, the metal cation aqueous solution serves as the complexing absorbent, and denitrification can be carried out in a simple and easy mode so as to simplify the technical flows and eliminate the possibility of secondary pollution; meanwhile, the concentration of the metal cations is limited within the optimized range obtained from multiple times of experiments so as to improve the efficacy of the production technology; and in addition, an experiment proves that the pH value of the complexing absorbent is set to be within 6-7 so as to quicken the reaction progress and cause no adverse influence on production equipment.

Description

Technical field [0001] The invention relates to a flue gas treatment method, in particular to a method for denitrifying flue gas containing nitrogen oxides and equipment using the method. Background technique [0002] At present, with the increasingly stringent environmental regulations and the general increase in public awareness of environmental protection, boiler flue gas pollution has become a prominent environmental problem, and the denitrification of boiler flue gas is a major engineering topic. The usual flue gas denitrification process and flow are SCR denitrification method and SNCR denitrification method. Metal oxides such as vanadium and titanium are mainly used as denitrification agents, and liquid ammonia is used as a reducing agent for denitrification at high temperatures. However, the disadvantages of the above process flow are large investment, complicated process flow, long engineering cycle, high price of denitrification agent and escape of liquid ammonia. These...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D53/60
Inventor 李雪梅杨明久
Owner 李雪梅
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