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

Technique for preparing sulfuric acid from SO2 by non-equilibrium state high-concentration twice conversion

A kind of high-concentration, sulfuric acid production technology

Active Publication Date: 2013-04-03
CHINA NERIN ENG +1
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-equilibrium high-concentration twice-conversion sulfuric acid production technology of SO2, which can handle SO2 Flue gas with sub>2 concentration less than 18% solves the problem that the temperature limit temperature of the catalyst cannot meet the high-concentration conversion requirements of more than 14% SO2, so as to reduce operating costs and total project investment , improve the steam output of the waste heat boiler, and better adapt to the change of copper-sulfur ratio in copper concentrate, which is an energy-saving and consumption-reducing conversion technology

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
  • Technique for preparing sulfuric acid from SO2 by non-equilibrium state high-concentration twice conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Attached below figure 1 The present invention is described in detail with embodiment;

[0012] from SO 2 Blower 1, SO 2 18% cold SO 2 The flue gas first enters the IV heat exchanger 3 and exchanges heat with the hot flue gas at the outlet of the fourth section of the converter 2. The flue gas undergoes heat exchange. After two heat exchanges, the flue gas temperature reaches the light-off temperature of the catalyst and enters the first stage of the converter for conversion reaction. Since the loading amount of the catalyst is less than normal, the conversion rate of the reaction is lower than the equilibrium conversion. At this time, the conversion rate is preferably less than 45%. (In general, the equilibrium conversion rate is about 65% as the concentration changes). flue gas SO 2 The concentration is about 12%, after which it is a conventional secondary conversion process. The flue gas at the outlet of the first section of the converter is cooled by the I hea...

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 technique for preparing sulfuric acid from SO2 by non-equilibrium state high-concentration twice conversion. SO2 flue gas is subjected to heat exchange twice through a heat exchanger and enters a first section of a converter to be subjected to conversion reaction; the filling amount of the catalyst for the first section of the converter is reduced so that the flue gas can leave the catalyst layer before reaching the SO2 equilibrium conversion rate; a waste heat boiler is arranged before the flue gas entering a second section of the converter to keep the temperature of the second section of the converter stable; the flue gas flows through the waste heat boiler and the heat exchanger to be cooled, and enters the second section catalyst layer of the converter, and at this time, the flue gas SO2 concentration is lower than 12%; the subsequent technique is equivalent to a conventional 3+1 twice conversion technique; and in the process, the temperatures of the first and second sections of the converter are lower than 640 DEG C. The technique can treat flue gas of which the SO2 concentration reaches 18% so as to lower the gross project investment and operating cost and enhance the steam output of the sulfuric acid waste heat boiler, thereby being an energy-saving consumption-reduction conversion technique.

Description

[0001] technical field [0002] The invention relates to a process for producing sulfuric acid by a contact method, in particular to a non-equilibrium high-concentration double conversion technology. Background technique [0003] The main raw materials for sulfuric acid production are pyrite, sulfur, and non-ferrous metal smelting flue gas. In the field of non-ferrous smelting flue gas acid production, with the development of non-ferrous metal oxygen-enriched smelting technology, especially the development of copper oxygen-enriched smelting technology, it has become a reality that the concentration of sulfur dioxide in the flue gas entering the flue gas acid production system reaches more than 20%. SO 2 converted to SO 3 is an exothermic reaction, SO 2 The higher the concentration, the greater the heat of reaction and the higher the temperature after conversion. Currently, for SO 2 converted to SO 3 For catalysts, the temperature resistance limit of foreign production ...

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 Applications(China)
IPC IPC(8): C01B17/765
CPCY02P20/129Y02P20/10
Inventor 余磊周俊陈敬军马宗昆汪满清王先建
Owner CHINA NERIN ENG
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