Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wet flue gas desulphurization process for carbide slag slurry pretreatment

A technology of wet flue gas desulfurization and calcium carbide slurry, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles to achieve the effects of improving gypsum quality, reducing content, and shortening oxidation time

Active Publication Date: 2012-04-04
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
View PDF2 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no consideration of its impact on reducing substances in carbide slag

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
  • Wet flue gas desulphurization process for carbide slag slurry pretreatment
  • Wet flue gas desulphurization process for carbide slag slurry pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A 220t / h coal-fired furnace in a thermal power plant adopts calcium carbide slag / gypsum wet desulfurization process for desulfurization, and the flue gas volume is 210,000m 3 / h, the concentration of sulfur dioxide at the inlet of the absorption tower is 2200mg / Nm 3 , using oxidation in the tower, using manganese sulfate as the catalyst, the catalyst concentration in the slurry storage tank is 0.5mmol / L, and the blast volume of the slurry storage tank is 3m 3 / m 3 h. The pH value is 5.7, and the design liquid-gas ratio is 8L / m 3 , the oxidation rate in the absorption tower is 47.3mmol / L·h, and the desulfurization efficiency is 95.7%. The moisture content of gypsum is lower than 8%, and the purity is higher than 96.5%.

Embodiment 2

[0019] A 2×75t / h coal-fired furnace in a chemical plant adopts calcium carbide slag / gypsum wet desulfurization process, with a flue gas volume of 310,000m 3 / h, the concentration of sulfur dioxide in the flue gas at the inlet of the absorption tower is 3100mg / Nm 3 , using copper sulfate and manganese sulfate as a composite salt of 1:2 (mass ratio) as a catalyst, the catalyst concentration in the slurry storage tank is 2mmol / L, and the blast volume of the slurry storage tank is 7m 3 / m 3 h. The pH value is controlled at 5.8, and the design liquid-gas ratio is 7L / m 3 , the desulfurization efficiency is 96.3%. Using external oxidation, the oxidation rate is 51.2mmol / L·h. The moisture content of gypsum is lower than 10%, and the purity is higher than 97.2%.

Embodiment 3

[0021] The coal-fired furnace of 2×135MW / h unit in a thermal power plant adopts calcium carbide slag / gypsum wet desulfurization process, and the flue gas volume is 1,200,000m 3 / h, the concentration of sulfur dioxide in the flue gas at the inlet of the absorption tower is 1700mg / Nm 3 , the design liquid-gas ratio is 6L / m 3 , using manganese sulfate as the catalyst, the catalyst concentration in the slurry storage tank is 10mmol / L, and the blast volume of the slurry storage tank is 8m 3 / m 3 ·h, the pH value is controlled at 5.5, the desulfurization efficiency is 98.7%. Oxidation in the tower is adopted, and the oxidation rate in the absorption tower is 48.8mmol / L·h. The moisture content of gypsum is less than 9%, and the purity is greater than 96.9%.

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

No PUM Login to View More

Abstract

The invention discloses a wet flue gas desulphurization process for carbide slag slurry pretreatment. Carbide slag slurry is used as desulfurater for wet desulphurization to flue gas. Catalyst is added in the carbide slag slurry. Air is blown into the carbide slag slurry for purpose of oxidation. The carbide slag slurry after the oxidation is again used as desulfurater for wet desulphurization tothe flue gas. The desulphurization process carries out oxidation pre-treatment on the desulfurater, namely the carbide slag slurry, thereby saving the cost which is caused by the large volume of an absorption tower (in-tower oxidation) or an oxidation tower (out-tower oxidation) due to the long oxidation time of calcium sulfite. The catalyst entering the absorption tower together with the carbideslag slurry can simultaneously accelerate the oxidizing speed of the calcium sulfite and calcium hydrogen sulfite in the oxidation tower, shorten the oxidation time, reduce the content of the calciumsulfite in the slurry and improve the gypsum quality.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a wet flue gas desulfurization process for carbide slag slurry pretreatment. Background technique [0002] The main component of calcium carbide slag is calcium hydroxide, which is the same as that of digested lime, and can replace lime as a desulfurizer. However, calcium carbide slag also contains reducing substances such as sulfur and phosphorus, which will inhibit the oxidation of calcium sulfite to calcium sulfate in the calcium carbide slag-gypsum flue gas desulfurization process. Reducing substances will delay the oxidation start time of desulfurization liquid for a period of time, reduce the oxidation rate, and affect the quality of the final gypsum output. [0003] The Chinese Invention Patent No. 200410092434.5 discloses a method for producing high-purity gypsum from waste carbide slag, including raw material pretreatment process, flue gas desu...

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): B01D53/80B01D53/50
Inventor 吴忠标莫建松程常杰李泽清
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com