Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for producing concentrated sulfuric acid from sulfur-containing flue gas

A technology of concentrated sulfuric acid and flue gas, which is applied in the field of chemical engineering and can solve the problems of high consumption

Active Publication Date: 2018-05-25
湖南中天元环境工程有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest problem with EDV wet flue gas desulfurization technology is that this technology consumes a large amount of water and NaOH as the absorption liquid, and the SO in the flue gas 2 After the reaction, it is converted into a large amount of sodium sulfate salt solution by oxidation, resulting in the discharge of a large amount of high-salt wastewater

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for producing concentrated sulfuric acid from sulfur-containing flue gas
  • A method for producing concentrated sulfuric acid from sulfur-containing flue gas
  • A method for producing concentrated sulfuric acid from sulfur-containing flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] refer to figure 1 and figure 2 , the flue gas enters the desulfurization tower 1 through the flue gas inlet 11 of the desulfurization tower 1, contacts with the absorbent in the desulfurization tower 1 to obtain desulfurization treatment, and then exits the desulfurization tower 1 through the flue gas outlet 12. In the initial stage of flue gas treatment, the absorbent is 1mol / L sodium hydroxide. Among them, the flow rate of flue gas is controlled to be 500,000 m 3 / h, the flow rate of absorbent is 4m 3 / h, NaHSO in the obtained absorption solution 3 with Na 2 SO 3 The molar ratio is 8:1.

[0118] The two-compartment bipolar membrane electrodialyzer 301 is used as a bipolar membrane electrodialysis device, and the absorption liquid discharged from the desulfurization tower 1 is introduced through the first salt chamber inlet 107 . In the initial stage of flue gas treatment, water is introduced through the inlet 108 of the first alkali chamber. Under the action ...

Embodiment 2

[0128] refer to image 3 and Figure 4 , the flue gas enters the desulfurization tower 1 through the flue gas inlet 11 of the desulfurization tower 1, contacts with the absorbent in the desulfurization tower 1 to obtain desulfurization treatment, and then exits the desulfurization tower 1 through the flue gas outlet 12. In the initial stage of flue gas treatment, the absorbent is 1mol / L sodium hydroxide. Among them, the flow rate of flue gas is controlled to be 500,000 m 3 / h, the flow rate of absorbent is 4m 3 / h, NaHSO in the obtained absorption solution 3 with Na 2 SO 3 The molar ratio is 8:1.

[0129] The two-compartment bipolar membrane electrodialyzer 302 is used as a bipolar membrane electrodialysis device, and the absorption liquid discharged from the desulfurization tower 1 is introduced through the second salt chamber inlet 138 . Water is introduced through the first acid chamber inlet 137 at the start of electrodialysis. Under the action of the electric fiel...

Embodiment 3

[0139] refer to Figure 5 and Figure 6 , the flue gas enters the desulfurization tower 1 through the flue gas inlet 11 of the desulfurization tower 1, contacts with the absorbent in the desulfurization tower 1 to obtain desulfurization treatment, and then exits the desulfurization tower 1 through the flue gas outlet 12. In the initial stage of flue gas treatment, the absorbent is 1mol / L sodium hydroxide. Among them, the flow rate of flue gas is controlled to be 500,000 m 3 / h, the flow rate of absorbent is 4m 3 / h, NaHSO in the obtained absorption solution 3 with Na 2 SO 3 The molar ratio is 8:1.

[0140] The three-compartment bipolar membrane electrodialyzer 303 is used as the bipolar membrane electrodialysis device, and the third salt chamber inlet 210 is connected to the absorption liquid outlet of the desulfurization tower 1 . The absorption liquid discharged from the desulfurization tower 1 is introduced through the third salt chamber inlet 210 . When the device ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for producing concentrated sulfuric acid by utilizing sulfur-containing flue gas, wherein the method comprises the following steps: (a) contacting the sulfur-containing flue gas with an absorbent to obtain desulfurized flue gas and absorption liquid; (b) ) introducing the absorption solution into a bipolar membrane electrodialysis device for electrodialysis to obtain a first dialysis solution capable of continuously absorbing SO2 and a second dialysis solution enriched in H2SO3; (c) desorbing the second dialysis solution , to obtain stripping liquid and containing SO2 stripping gas; (d) SO in the stripping gas is oxidized to SO3, the stripping liquid is divided into the first stripping liquid and the second stripping liquid, and the first stripping liquid is used to The desorption solution absorbs the converted SO3 to generate H2SO4; the second desorption solution is reused in the electrodialysis device to enrich H2SO3. The invention can fully convert SO2 in flue gas into concentrated sulfuric acid, basically realize zero waste water discharge, and effectively recover absorption liquid.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a method for producing concentrated sulfuric acid from flue gas containing sulfur. Background technique [0002] Smoke generally refers to a mixture of gas and smoke. The operation of chemical equipment such as boilers, industrial furnaces, thermal power plants, coke ovens, cement plants, blast furnaces, open hearth furnaces, converters, electric furnaces and catalytic cracking (FCC) units will generate a large amount of flue gas. A large amount of air pollutants such as sulfur oxides and nitrogen oxides contained in flue gas have brought a series of environmental problems. Reducing the emission of air pollutants including sulfur oxides and nitrogen oxides is an urgent task to protect the environment. For example, national standards GB13271-91 "Emission Standard of Air Pollutants for Boilers", GB9078-1996 "Emission Standards of Air Pollutants for Industrial Furnaces", GB1322...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/96B01D61/42C01B17/74C02F1/469C02F103/18
Inventor 谢志成刘凯中冯晓霞王培功
Owner 湖南中天元环境工程有限公司