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Flue gas desulfurization and sulfur-containing waste liquid recycling coupling process

A technology of resource utilization and flue gas, applied in the direction of gaseous effluent wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high operating cost, low product utilization rate, complex desulfurization process, etc., to achieve Reduce process operating costs, realize resource utilization, and have strong adaptability

Pending Publication Date: 2021-07-06
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present disclosure aims at the problems existing in the prior art such as complex desulfurization process, low product utilization rate, low economic benefits of by-products, large consumption of sodium hydroxide, high operating cost, solid waste recycling, etc., and provides a flue gas desulfurization and sulfur-containing Waste liquid recycling coupling process, which is used for the recovery and treatment of sulfur-containing waste liquid

Method used

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  • Flue gas desulfurization and sulfur-containing waste liquid recycling coupling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] SO in flue gas containing sulfur 2 Effect of Concentration on Treatment Process

[0067] A coupling process of flue gas desulfurization and sulfur-containing waste liquid recycling described in this embodiment specifically includes the following steps:

[0068] (1) Set up five groups of comparative experiments numbered 1, 2, 3, 4, and 5 respectively, and compare the SO in the sulfur-containing flue gas of groups 1-5 2The concentrations were set to 1%, 3%, 5%, 10%, and 15% respectively; each group of sulfur-containing flue gas was injected into their respective spray towers, and the dilute NaOH solution produced by electrolysis was adjusted by concentration (the mole fraction was 1mol / L ) is returned to the lye tank and injected into the spray tower, and the sulfur-containing flue gas reacts with the dilute NaOH solution to generate sulfur-containing waste liquid;

[0069] (2) O produced by electrolysis 2 Pre-oxidize the sulfur-containing waste liquid; the pre-oxidize...

Embodiment 2

[0077] Effect of different mole fractions of NaOH solution on the treatment process

[0078] A coupling process of flue gas desulfurization and sulfur-containing waste liquid recycling described in this embodiment specifically includes the following steps:

[0079] (1) Set up five groups of comparative experiments numbered 6, 7, 8, 9, and 10 respectively, inject 6-10 groups of sulfur-containing flue gas into their respective spray towers, and adjust the molar fraction of dilute NaOH solution produced by electrolysis to 0.1 mol / L, 0.5mol / L, 1mol / L, 1.5mol / L, 2mol / L, and then return to the lye tank and inject into the spray tower, the sulfur-containing flue gas reacts with the dilute NaOH solution to generate sulfur-containing waste liquid;

[0080] (2) O produced by electrolysis 2 Pre-oxidize the sulfur-containing waste liquid; the pre-oxidized sulfur-containing waste liquid is injected into the electrolytic dialysis cell and converted into dilute H 2 SO 4 and dilute NaOH so...

Embodiment 3

[0088] Influence of Vacuum Degree on Treatment Process

[0089] A coupling process of flue gas desulfurization and sulfur-containing waste liquid recycling described in this embodiment specifically includes the following steps:

[0090] (1) Set up five groups of comparative experiments numbered 11, 12, 13, 14, and 15 respectively, inject sulfur-containing flue gas of groups 11-15 into respective spray towers, and dilute NaOH solutions produced by electrolysis in each group are adjusted by concentration ( The mole fraction is 1mol / L) back to the lye tank and injected into the spray tower, the sulfur-containing flue gas reacts with the dilute NaOH solution to generate sulfur-containing waste liquid;

[0091] (2) O produced by electrolysis 2 Pre-oxidize the sulfur-containing waste liquid; the pre-oxidized sulfur-containing waste liquid is injected into the electrolytic dialysis cell and converted into dilute H 2 SO 4 and dilute NaOH solution, while producing electrolysis produ...

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Abstract

The invention provides a flue gas desulfurization and sulfur-containing waste liquid recycling coupling process, which is characterized in that SO2 in flue gas is sprayed and absorbed by using a NaOH solution to generate a sulfur-containing waste liquid, then Na2SO4 and Na2SO3 in the sulfur-containing waste liquid are converted into dilute H2SO4 and a dilute NaOH solution by using an electrodialysis device, and the dilute H2SO4 is concentrated under a negative pressure condition and then taken out for other purposes. In the process of concentrating the dilute H2SO4, the concentration of the dilute H2SO4 in the electrodialysis device is controlled in real time by recycling water vapor; and meanwhile, a dilute NaOH solution obtained by electrolysis is introduced into the spray tower through reflux to be continuously used for absorbing SO2. Besides, in the whole SO2 absorption process, the NaOH absorption liquid only needs to be prepared once initially, and extra consumption of NaOH is not needed subsequently. The process is simple, green and economical, sulfur elements in the sulfur-containing waste liquid can be recycled while SO2 in the flue gas is removed, good environmental benefits are achieved, updating and upgrading of the green desulfurization technology in China are promoted, and the pressure of sulfur-containing waste liquid treatment is relieved.

Description

technical field [0001] The present disclosure relates to the technical field of energy conservation and environmental protection, in particular to a coupling process of flue gas desulfurization and sulfur-containing waste liquid recycling. Background technique [0002] In recent years, my country's nonferrous metal industry has developed rapidly. With the rapid development of the nonferrous metal industry, the environmental protection situation is becoming increasingly severe. Most non-ferrous metal minerals exist in the form of sulfide, so there will be a considerable concentration of SO in the process of pyrometallurgy 2 The release of pollutants will cause serious pollution if resource utilization or purification treatment is not carried out. For the smelting process of non-ferrous metals such as copper, nickel, lead, zinc, etc., due to the SO produced 2 The concentration is relatively high, which can often reach 7-28%, so the technical route of flue gas desulfurizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/96B01D53/78C02F9/06C02F103/18
CPCB01D53/502B01D53/965B01D53/78C02F1/4695C02F1/727C02F2103/18B01D2251/304B01D2251/604
Inventor 宋辛李波宁平李凯李婵李斌刘小艳
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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