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

Method for heating acid washing solution

A heating method and pickling technology, which are used in the pickling process of hot-rolled strips in the cold rolling industry and the field of pickling solution heating, which can solve the problem of increasing the burden on the acid mist purification system, reducing the pickling speed, and corrosion of equipment and workshop steel structures. And other issues

Inactive Publication Date: 2013-03-27
TIANJIN YIBO STEEL MAKING
View PDF5 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pickling solution is generally heated by steam. For example, when steam is used for direct heating, the pickling solution is continuously diluted due to the condensed water of the steam entering the pickling tank, which reduces the pickling speed; direct heating with steam produces a large amount of acid mist. The burden on the acid mist purification system is increased; the pickling solution is replaced too quickly, which increases the load of the acid regeneration system; direct heating of steam can easily cause the acid mist to escape, causing corrosion of equipment and steel structures in the workshop

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
  • Method for heating acid washing solution
  • Method for heating acid washing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The pickling solution in the pickling tank 1 flows back to the acid circulation tank 2, and is filtered by the filter 3. The acid-resistant pump 4 pumps the pickling solution into the heater 6 through the heater inlet 5, and the heated pickling solution (90°C) passes through The heater outlet 7 is driven into the pickling tank 1 to form a cycle, and so on. The heating steam enters through the steam inlet 8 and is discharged from the steam outlet 9, so that the pickling solution always maintains the normal process temperature. The acid mist generated during the pickling process is concentrated by the mist collector 10 under the action of the mist exhaust fan 12, and the acid mist enters the acid mist purification system 11 for purification, and the mist exhaust fan 12 discharges the mist meeting the emission standard to the atmosphere 13.

[0024] Adoption of the present invention realizes heat exchange indirectly, does not dilute the pickling solution, and does not have...

Embodiment 2

[0028] A heating method for a pickling solution, characterized in that it proceeds in the following steps:

[0029] The pickling solution in the pickling tank 1 flows back to the acid circulation tank 2, and is filtered by the filter 3. The acid-resistant pump 4 pumps the pickling solution into the heater 6 through the heater inlet 5, and the heated pickling solution reaches 70°C. The heater outlet 7 enters the pickling tank 1 to form a cycle, and so on and on; the heating steam enters from the steam inlet 8 and is discharged from the steam outlet 9, so that the pickling solution always maintains the normal process temperature; the acid produced in the pickling process The mist is concentrated by the mist collector 10 under the action of the mist exhaust fan 12, and the acid mist enters the acid mist purification system 11 to be purified, and the mist exhaust fan 12 discharges the mist meeting the emission standard to the atmosphere 13.

Embodiment 4

[0031] A heating method for a pickling solution, characterized in that it proceeds in the following steps:

[0032] The pickling solution in the pickling tank 1 flows back to the acid circulation tank 2, and is filtered by the filter 3. The acid-resistant pump 4 pumps the pickling solution into the heater 6 through the heater inlet 5, and the heated pickling solution reaches 90°C. The heater outlet 7 enters the pickling tank 1 to form a cycle, and so on and on; the heating steam enters from the steam inlet 8 and is discharged from the steam outlet 9, so that the pickling solution always maintains the normal process temperature; the acid produced in the pickling process The mist is concentrated by the mist collector 10 under the action of the mist exhaust fan 12, and the acid mist enters the acid mist purification system 11 to be purified, and the mist exhaust fan 12 discharges the mist meeting the emission standard to the atmosphere 13.

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 method for heating acid washing solution. The method comprises: (1) the acid washing solution in an acid washing tank 1 flows back into an acid circulation tank 2, is filtered through a filter 3 and is pumped into a heater 6 by an acid-resistant pump 4 through an inlet 5 of the heater, the heated acid washing solution is pumped into the acid washing tank 1 through an outlet 7 of the heater to form circulation, and the circulation is repeated in the way; (2) heating steam enters through a steam inlet 8 and is discharged through a steam outlet 9, so that the acid washing solution is kept at normal technological temperature all the time; and (3) acid mist which is generated during the acid washing process is concentrated through a mist collector 10 under the action of a mist exhaust fan 12 and enters an acid mist purification system 11 to be purified, and the mist which meets the emission standards is discharged to the atmosphere 13 through the mist exhaust fan 12. By the method, heat exchange is indirectly realized, the acid washing solution cannot be diluted, excessive acid mist is not generated, the acid mist cannot be leaked during the heat exchange process, and the heating process of the acid washing solution and the temperature of the acid washing solution can be automatically controlled through adopting a heat exchanger.

Description

technical field [0001] The invention relates to an auxiliary method for the production process of the cold rolling industry, in particular to a method for heating a pickling solution, which is suitable for the pickling process of hot-rolled strips in the cold rolling industry. Background technique [0002] At present, before the cold rolling of the hot-rolled carbon structural steel strip, it is necessary to clean the oxide scale on the surface of the hot-rolled strip through a pickling process. In the pickling process, sulfuric acid pickling mainly relies on mechanical stripping to remove scale; hydrochloric acid pickling mainly relies on dissolution to remove scale. In order to speed up the pickling speed, improve the pickling quality, and adapt to modern large-scale production, it is necessary to heat the pickling solution to a certain temperature. The higher the temperature of the pickling solution, the stronger the activity and the shorter the pickling time. The sulfur...

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): C23G3/00C23G3/02
Inventor 宋书成
Owner TIANJIN YIBO STEEL MAKING
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