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Method used for recycling sulfur and nitrogen resources from flue gas and producing hydroxylamine sulphate

A technology of hydroxylamine sulfate and sulfur recovery, applied in the field of environmental protection and chemical engineering, to achieve the effects of reducing production costs, solving the problem of nitrite wastewater, and high economic value

Inactive Publication Date: 2017-11-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the existing wet desulfurization and denitrification wastewater treatment problems, propose a method for recovering nitrogen oxides and sulfur dioxide from flue gas, realize the maximum utilization of sulfur and nitrogen resources in flue gas, and realize "turning waste into treasure" "

Method used

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  • Method used for recycling sulfur and nitrogen resources from flue gas and producing hydroxylamine sulphate

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Embodiment 1

[0051] Based on the method and system of the present invention, the process of flue gas desulfurization and denitrification and sulfur and nitrogen resource reuse is simulated on an experimental simulation device. The flue gas components are as follows: NO is 350ppm, SO 2 500ppm, O 2 It is 5%, the rest is nitrogen, the flue gas temperature is 120°C, and the pressure is 1 atmosphere. Follow H 2 O 2 : The ratio of NO=1:1 is sprayed into hydrogen peroxide. The parameters of the absorption tower are: the absorption tower is a packed tower, and the absorption liquid is 10% Na 2 SO 3 Solution, liquid-gas ratio is 8L / m 3 , PH is controlled at 6.5. SO in the synthesis process of sulfur and nitrogen compounds 2 : NO 2 - The molar ratio is 5:1, the liquid-gas ratio is 3L / m 3 , The pH of the spray liquid is 2.5. The removal efficiency of NO in flue gas after absorption can reach 90%, SO 2 The removal efficiency can reach 99%, and the yield of hydroxylamine sulfate in the absorption solut...

Embodiment 2

[0053] Based on the method and system of the present invention, the process of flue gas desulfurization and denitrification and sulfur and nitrogen resource reuse is simulated on an experimental simulation device. The flue gas components are as follows: NO is 350ppm, SO 2 500ppm, O 2 It is 5%, the rest is nitrogen, the flue gas temperature is 120°C, and the pressure is 1 atmosphere. Follow O 3 : The ratio of NO=1:1 is sprayed into ozone. The parameters of the absorption tower are: the absorption tower is a packed tower, and the absorption liquid is 10% Na 2 SO 3 Solution, liquid-gas ratio is 8L / m 3 , PH is controlled at 6.5. SO in the synthesis process of sulfur and nitrogen compounds 2 : NO 2 - The molar ratio is 5:1, the liquid-gas ratio is 3L / m 3 , The pH of the spray liquid is 2.5. The removal efficiency of NO in flue gas after absorption can reach 90%, SO 2 The removal efficiency can reach 99%, and the yield of hydroxylamine sulfate in the absorption solution can reach 17...

Embodiment 3

[0055] Based on the method and system of the present invention, the process of flue gas desulfurization and denitrification and sulfur and nitrogen resource reuse is simulated on an experimental simulation device. The flue gas components are as follows: NO is 350ppm, SO 2 500ppm, O 2 It is 5%, the rest is nitrogen, the flue gas temperature is 120°C, and the pressure is 1 atmosphere. Follow O 3 : NO = 1:1 ratio is sprayed into ozone. The parameters of the absorption tower are: the absorption tower is a packed tower, and the absorption liquid is 10% Na 2 SO 3 Solution, the liquid-gas ratio is 10L / m 3 , PH is controlled at 6.5. SO in the synthesis process of sulfur and nitrogen compounds 2 : NO 2 - The molar ratio is 5:1, the liquid-gas ratio is 3L / m 3 , The pH of the spray liquid is 2.5. The removal efficiency of NO in flue gas after absorption can reach 95%, SO 2 The removal efficiency can reach 99%, and the yield of hydroxylamine sulfate in the absorption solution can reach 20...

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Abstract

The invention discloses a method used for recycling sulfur and nitrogen resources from flue gas and producing hydroxylamine sulphate. The method comprises following steps: 1, boiler fuel gas is subjected to pre-dedusting and then spray cooling dedusting, after spray cooling dedusting, the flue gas is mixed with an oxidizing agent for oxidation, after oxidation, the flue gas is delivered into an absorbing tower for circulating spray and synchronous desulphurization and denitration, so that flue gas purifying is realized, and an absorption liquid containing SO4<2-> and NO2<-> is obtained; 2, the absorption liquid is discharged, and is used for spray cooling dedusting of flue gas, wherein NO2<-> in the absorption liquid is reacted with SO2 in flue gas, and a sulfur nitrogen compound absorption waste liquid is obtained; and 3, the sulfur nitrogen compound absorption waste liquid is subjected to defouling and purifying so as to obtain a hydroxylamine disulfonate solution, and the hydroxylamine disulfonate solution is subjected to hydrolysis at 95 to 110 DEG C so as to obtain a hydroxylamine sulphate solution, and separation and purification are carried out so as to obtain hydroxylamine sulphate solid. The method is capable of solving nitrite waste water problems in wet synchronous desulphurization and denitration, realizing recycling of sulfur and nitrogen resources in flue gas, and producing hydroxylamine sulphate which is relatively high in economical value.

Description

Technical field [0001] The invention relates to the fields of environmental protection and chemical engineering, and specifically is a method for recovering sulfur and nitrogen resources from flue gas and producing hydroxylamine sulfate products from by-products. Background technique [0002] With the increase in energy demand, air pollution caused by the use of traditional fossil fuels has received widespread attention. Under the current increasingly stringent nitrogen oxide emission requirements, the corresponding treatment technology has become a research hotspot, and the "oxidation-absorption" two-step desulfurization and denitrification technology (wet simultaneous desulfurization and denitrification technology) has high removal efficiency. And the wider scope of application has received more attention from researchers. However, the current wet simultaneous desulfurization technology only converts nitrogen oxides in the gas phase into nitrate and nitrite in the liquid phase...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60B01D47/06C01B21/14
CPCB01D47/06B01D53/60B01D53/78B01D2258/0283C01B21/1427Y02A50/20
Inventor 王海强吴穹吴忠标陈思
Owner ZHEJIANG UNIV
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