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Flue gas simultaneous desulfurization and denitrogenation by utilizing triethylenediamine cobalt (III) and carbamide

A technology of ethylenediamine and urea, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the secondary pollution of solid waste, easy blockage of calcium sulfite equipment, difficulty in regeneration of ferrous complexes, etc. problems, to achieve the effect of less consumption of chemical raw materials, low chemical dosage, and cost reduction

Inactive Publication Date: 2006-05-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent applications with application numbers 03003768.7 and 01130154.6 disclose two methods for wet desulfurization and denitrification of urea additives. The mass percentage content of the absorbent urea used in the two methods is both 5-30%. The chemical dosage is large and the cost is high. , although its SO 2 The removal rate can reach more than 95%, but its NO X The removal rate is only 80%; the disadvantage of simultaneous desulfurization and denitrification of the ferrous complex system is that the regeneration of the ferrous complex is difficult and the cost is high; the Chinese patent applications with application numbers 01105004.7, 01105698.3, 02110646.0 and 200310108514.0 disclose cobalt ammonia solution and ethylenediamine cobalt solution to efficiently absorb nitrogen oxides in flue gas, the concentration of NO in the outlet gas can be as low as 0%, among which ethylenediamine cobalt is easy to regenerate, and has the most advantage
Among them, the patented technology with application number 02110646.0 uses ethylenediamine cobalt combined with calcium oxide for simultaneous desulfurization and denitrification of flue gas, and calcium oxide is used to reduce SO 3 2- concentration to avoid reducing the removal rate of NO, but the by-product calcium sulfite with low economic benefits is generated, so that sulfur resources cannot be effectively recovered, and at the same time, equipment blockage and secondary pollution of solid waste are caused, which does not meet environmental protection requirements
In general, the existing technology has the following disadvantages: simultaneous desulfurization and denitrification of urea additives, large chemical dosage, high cost, and low NO removal rate; simultaneous desulfurization and denitrification of ethylenediamine cobalt combined with calcium oxide, although NO removal The rate is high, but the by-product calcium sulfite is easy to block the equipment and cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Simulated flue gas: the gas flow rate is 700ml / min; the SO in the gas inlet composition 2 The content is 600ppm, NO is 200ppm, O 2 The volume percentage concentration is 5%, and the rest is nitrogen; the temperature is 50°C.

[0030] Absorbing liquid: the volume is 150ml; the cobalt chloride concentration in the liquid composition is 0.005M, the ethylenediamine concentration is 0.1% (volume), the ethylenediamine cobalt concentration is 0.005M, and the urea mass percentage concentration is 0.1%; the pH value of the solution is 8.0.

[0031] Method and detection: In a 500ml gas absorption bottle, containing SO 2 The simulated flue gas of NO and NO enters the absorption liquid in the absorption bottle, and lasts for 3 hours to carry out the flue gas simultaneous desulfurization and denitrification experiment, and the reaction operating temperature is 50°C. Detection of SO by Formaldehyde Absorption-Pararosaniline Hydrochloride Colorimetric Method for Gas Outlet Concentr...

Embodiment 2

[0034] Simulated flue gas: the gas flow rate is 700ml / min; the SO in the gas inlet composition 2 1800ppm, NO 450ppm, O 2 8%, the rest is nitrogen; the temperature is 60°C.

[0035] Absorbing solution: the volume is 150ml; the concentration of cobalt chloride in the absorbing solution is 0.01M, the concentration of ethylenediamine is 1% (volume), the concentration of ethylenediamine cobalt is 0.01M, and the concentration of urea mass percentage is 0.5%; the pH of the absorbing solution The value is 12.0.

[0036] Method and detection: In a 500ml gas absorption bottle, containing SO 2 Simultaneous flue gas desulfurization and denitrification experiment of flue gas was carried out with the simulated flue gas of NO and the absorption liquid in the absorption bottle for 5.5 hours, and the reaction operating temperature was 60°C. Detection of SO by Formaldehyde Absorption-Pararosaniline Hydrochloride Colorimetric Method for Gas Outlet Concentration 2 Concentration, NO concentr...

Embodiment 3

[0039] Simulated flue gas: the gas flow rate is 700ml / min; the SO in the gas inlet composition 2 5000ppm, NO 1100ppm, O 2 15%, the rest is nitrogen; the temperature is 70°C.

[0040] Absorbing solution: the volume is 150ml; the concentration of cobalt chloride in the absorbing solution is 0.04M, the concentration of ethylenediamine is 2% (volume), the concentration of ethylenediamine cobalt is 0.04M, and the mass percentage concentration of urea is 5%; the pH of the absorbing solution The value is 13.0.

[0041] Method and detection: In a 500ml gas absorption bottle, containing SO 2 Simultaneous flue gas desulfurization and denitrification experiments were carried out with the simulated flue gas of NO and NO and the absorption liquid in the absorption bottle for 7 hours, and the reaction operating temperature was 70°C. Detection of SO by Formaldehyde Absorption-Pararosaniline Hydrochloride Colorimetric Method for Gas Outlet Concentration 2 Concentration, NO concentration...

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Abstract

The invention relates to a method for synchronously de-sulfuration and de-nitrification with ethanediamine cobalt and carbamide wet method from smoke. The invention uses absorption solution to absorb the SO2 and NO of smoke, while the absorption solution is prepared by water-soluble inorganic cobalt salt, ethanediamine, carbamide, and sodium-hydroxide water solution, while the water-soluble inorganic cobalt salt can react with ethanediamine to generate ethanediamine cobalt. The invention uses ethanediamine cobalt as absorbent and catalysis oxidant of NO, while in the purpose for avoiding the Co2(SO3)3 reducing NO removing ratio, it adds carbamide and uses O2 as oxidant to transform the SO32- completely into SO42, to realize de-sulfuration and de-nitrification synchronously. The invention can make lowest concentration of SO3 and NO at outlet reach 0%, the oxidization ratio of SO32- reach 100%, and the ethanediamine cobalt can be regenerated easily, therefore, it only needs material one time. Since the cost of carbamide is lower, the total cost of chemical agents is lower without secondary pollution, which can apply the industry.

Description

technical field [0001] The invention relates to the technical field of flue gas purification and treatment, in particular to the desulfurization and denitrification of flue gas, in particular the simultaneous use of ethylenediamine cobalt and urea wet flue gas desulfurization and denitrification technology. Background technique [0002] Contains SO 2 and NO X A large amount of exhaust gas has caused serious environmental pollution problems, such as acid rain and the destruction of the ozone layer. Simultaneous flue gas desulfurization and denitrification technology is a hot technology that has only been researched and developed in the past ten years. Among them, NO X The removal of NO with a medium concentration of more than 95% is still a difficult point. At present, the existing technologies at home and abroad mainly include plasma method and a few catalytic methods. Due to relatively high equipment investment and operating costs, product reco...

Claims

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Application Information

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IPC IPC(8): B01D53/60
CPCY02A50/20
Inventor 邓先和周春琼潘朝群
Owner SOUTH CHINA UNIV OF TECH
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