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

Process technique for discharged desulfurization solutions of HPF desulfurization system of coke-oven plant

A technology of desulfurization system and treatment process, applied in the direction of chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems that cannot meet the requirements of industrial products, continuous regeneration is not easy to achieve, and is not suitable for processing desulfurization liquid, etc., to achieve Good economic and social benefits, innovative research ideas, and good market prospects

Inactive Publication Date: 2009-12-23
HEBEI IRON AND STEEL
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a fatal flaw in the HPF desulfurization process: in order to maintain a high desulfurization efficiency, a large amount of desulfurization liquid must be discharged
Although the wet oxidation process can completely solve the problem of desulfurization liquid discharge, the investment is huge and the operating cost is high, which many coking plants cannot afford
[0005] USP5276189 utilizes Ca(OH) 2 Ca(SCN) can be produced by reacting with the desulfurization waste liquid discharged outside 2 , but the production of Ca(SCN) 2 The liquid is dark brown and has a strong odor, which cannot meet the requirements of industrial products
[0006] Patent WO2005 / 100243 proposes adding Fe to sulfur-containing wastewater under acidic conditions 3+ , at Fe 3+ Under the catalytic oxidation of NH 4 SCN to H(SCN) 3 , this complex is easily adsorbed by activated carbon, but this method is only suitable for the treatment of low-concentration thiocyanate waste liquid, and the price of activated carbon is relatively expensive, and continuous regeneration is not easy to achieve in industry, so this method is not suitable Suitable for treating the desulfurization liquid discharged from the HPF desulfurization system
[0007] NH can be directly separated from the desulfurization liquid by direct evaporation using the phase diagram principle of multi-component aqueous solution 4 SCN, due to high operating costs and harsh process conditions, it is difficult to popularize and apply

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
  • Process technique for discharged desulfurization solutions of HPF desulfurization system of coke-oven plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the complexing agent CuSO 4 .5H 2 Add O into the complexing kettle, adjust the temperature to 20°C, adjust the concentration of hydrogen ions to 10mol / L with sulfuric acid, add the desulfurization liquid discharged out at a ratio of 1:2.5, and set the reaction pressure to 1atm. The reaction that takes place in the complexing kettle is: (NH 4 ) 2 S 2 o 3 and (NH 4 ) 2 SO 3 is oxidized to (NH 4 ) 2 SO 4 , and the complexing agent is reduced at the same time, the complexing agent in the reduced state selects the SCN in the desulfurization solution -1 Ions generate a solid intermediate product—CuSCN. After the reaction is completed, the treated desulfurization liquid and solid intermediate product - CuSCN are separated by filter press. The desulfurization liquid enters the biochemical system for further treatment after being distilled with ammonia, and the solid intermediate product - CuSCN enters the product generation step.

[0029]...

Embodiment 2

[0032] Such as figure 1 As shown, the complexing agent CuSO 4 .5H 2 O was added to the complexing kettle, the temperature was adjusted to 30°C, the pH value was adjusted to 2 with sulfuric acid, and the desulfurization liquid was added at a ratio of 1:3.5, and the reaction pressure was set at 2atm. The reaction that takes place in the complexing kettle is: (NH 4 ) 2 S 2 o 3 and (NH 4 ) 2 SO 3 is oxidized to (NH 4 ) 2 SO 4 , and the complexing agent is reduced at the same time, the complexing agent in the reduced state selects the SCN in the desulfurization solution -1 Ions generate a solid intermediate product—CuSCN. After the reaction is completed, the treated desulfurization liquid and solid intermediate product - CuSCN are separated by filter press. The desulfurization liquid enters the biochemical system for further treatment after being distilled with ammonia, and the solid intermediate product - CuSCN enters the product generation step.

[0033] The solid in...

Embodiment 3

[0036] Such as figure 1 As shown, the complexing agent CuSO 4 .5H 2 O was added to the complexing kettle, the temperature was adjusted to 50°C, the pH value was adjusted to 3 with sulfuric acid, and the desulfurization liquid was added in a ratio of 1:4.5, and the reaction pressure was set at 5atm. The reaction that takes place in the complexing kettle is: (NH 4 ) 2 S 2 o 3 and (NH 4 ) 2 SO 3 is oxidized to (NH 4 ) 2 SO 4 , and the complexing agent is reduced at the same time, the complexing agent in the reduced state selects the SCN in the desulfurization solution -1 Ions generate a solid intermediate product—CuSCN. After the reaction is completed, the treated desulfurization liquid and solid intermediate product - CuSCN are separated by filter press. The desulfurization liquid enters the biochemical system for further treatment after being distilled with ammonia, and the solid intermediate product - CuSCN enters the product generation step.

[0037] The solid in...

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 relates to a treatment process for desulfurization liquid discharged from an HPF desulfurization system of a coking plant, which belongs to the technical field of waste liquid treatment and is used to solve the problems of reducing the COD content in the desulfurization liquid and recovering various thiocyanate products. In particular, the method includes the following steps: A. catalytic oxidation-selective complexation; B. pressure filtration or centrifugal separation; C. product generation; D. complexing agent regeneration. The method of the present invention has the following characteristics: 1. Utilize the SCN in the desulfurization liquid to produce NaSCN, KSCN and other chemical products; 2. After the treatment, the COD is reduced from 140000mg / L to below 15000mg / L; 3. The technology investment is less and the operation is simple ; 4. The complexing agent can be recycled, the operating cost is low, and the economic benefit is obvious. The invention has novel research ideas, reasonable technology, conforms to the concept of circular economy, and has good economic and social benefits.

Description

technical field [0001] The invention relates to a processing method for desulfurization liquid discharged from an HPF desulfurization system of a coking plant, and belongs to the technical field of waste liquid treatment. Background technique [0002] Coke oven gas is the most important by-product in the coking process. Coke oven gas contains a large amount of toxic and harmful gases such as hydrogen sulfide and hydrogen cyanide. The desulfurization and decyanation of coke oven gas is very important. Due to the high desulfurization efficiency and low investment, HPF desulfurization process has been widely used. However, there is a fatal flaw in the HPF desulfurization process: in order to maintain a high desulfurization efficiency, a large amount of desulfurization liquid must be discharged. Taking a coking plant with 2 million tons / year as an example, 20-30 tons of desulfurization liquid is discharged every day. Desulfurization waste liquid is a complex mixture containing...

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): B01D53/96B01D53/48
Inventor 张晓力薛德业邵有辉苏海强杨林浩冯天伟刘洪涛刘少阳
Owner HEBEI IRON AND STEEL
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