CN-122013199-A - Acid regeneration operation system and method

CN122013199ACN 122013199 ACN122013199 ACN 122013199ACN-122013199-A

Abstract

The invention provides an acid regeneration operation system and method, wherein the acid regeneration operation system comprises a treated acid collecting device, a treated acid concentrating device, a roasting device, a furnace gas pre-washing device and a hydrogen chloride absorbing device, the treated acid collecting device is connected with the treated acid concentrating device, the treated acid concentrating device is connected with the roasting device, the roasting device is connected with the furnace gas pre-washing device, the furnace gas pre-washing device is connected with the treated acid concentrating device, and the treated acid concentrating device is connected with the hydrogen chloride absorbing device. The invention can avoid excessive ferric oxide powder from entering the treatment acid concentration device, reduce the carrying amount of the ferric oxide powder in the treatment acid after concentration, avoid the problem that the concentration ratio of the treatment acid is large due to the overhigh temperature of furnace gas, solve the problems of easy damage of an absorption tower and lower acid regeneration efficiency, and has high energy utilization rate and low hydrogen chloride content in an external exhaust body.

Inventors

WANG ZHIYAN
ZHOU XIANGYANG
LI GUOCANG
FU ZHIPING
ZHANG LE
CHEN LUZHEN
MA JUE
JIANG DONG
ZHAO YAJUN
LI RUNYUE

Assignees

湖南华菱涟钢特种新材料有限公司
湖南华菱涟源钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20251216

Claims (10)

1. An acid regeneration operation system is characterized by comprising a treated acid collecting device, a treated acid concentrating device, a roasting device, a furnace gas pre-washing device and a hydrogen chloride absorbing device; the treatment acid concentration device is connected with the roasting device and is used for conveying concentrated acid to the roasting device, roasting to obtain roasting furnace gas and ferric oxide powder, and part of ferric oxide powder is mixed in the roasting furnace gas; The roasting device is connected with the furnace gas pre-washing device, the roasting furnace gas is conveyed to the furnace gas pre-washing device, the roasting furnace gas is contacted with first rinsing water in the furnace gas pre-washing device to obtain pre-washing liquid and pre-washing furnace gas, the furnace gas pre-washing device is connected with the treatment acid concentration device, the pre-washing furnace gas is conveyed to the treatment acid concentration device, the pre-washing furnace gas is contacted with treatment acid in the treatment acid concentration device to obtain concentrated acid and furnace gas to be absorbed, the treatment acid concentration device is connected with the hydrogen chloride absorption device, the furnace gas to be absorbed is conveyed to the hydrogen chloride absorption device, and the furnace gas to be absorbed is contacted with absorption liquid containing the pre-washing liquid to obtain regenerated acid and furnace gas to be washed.
2. The acid regeneration operation system according to claim 1, wherein the absorption liquid comprises a pre-washing liquid and a second rinse water, the acid regeneration operation system further comprises a rinse water collecting device, wherein the furnace gas pre-washing device is connected with the rinse water collecting device and used for conveying the pre-washing liquid to the rinse water collecting device, the rinse water collecting device is connected with the hydrogen chloride absorption device and used for conveying the absorption liquid to the hydrogen chloride absorption device, and the rinse water collecting device is further connected with a rinse water supply device and used for receiving the second rinse water provided by the rinse water supply device; The first rinse water entering the furnace gas pre-washing device comprises pre-washing liquid and second rinse water, the rinse water collecting device conveys the pre-washing liquid and the second rinse water to the furnace gas pre-washing device, the second rinse water is sourced from the rinse water supply device, or the first rinse water entering the furnace gas pre-washing device is identical to the second rinse water in source, and the first rinse water and the second rinse water are rinse water sourced from the rinse water supply device.
3. The acid regeneration operating system of claim 1, wherein the furnace gas pre-wash device comprises a first venturi pre-concentrator, the treated acid concentration device comprises a second venturi pre-concentrator, and the hydrogen chloride absorption device comprises an absorption tower.
4. The acid regeneration operation system according to claim 1, wherein the roasting device comprises an iron oxide powder roasting furnace, the iron oxide powder roasting furnace is connected with the treatment acid concentration device through a liquid supply pipeline, an injection assembly for injecting concentrated acid downwards is arranged at the top of the iron oxide powder roasting furnace, a first heating assembly and a second heating assembly for supplying heat to a furnace chamber are further arranged on the iron oxide powder roasting furnace, the first heating assembly is higher than the middle part of the furnace chamber, the second heating assembly is lower than the middle part of the furnace chamber, combustion gas is horizontally injected by the first heating assembly, and combustion gas is obliquely and downwards injected by the second heating assembly.
5. The acid regenerating operation system as set forth in claim 4, wherein the iron oxide powder roasting furnace is provided with a roasting furnace gas outlet at the top and a residual furnace gas outlet at a lateral position at the bottom, roasting furnace gas is discharged outward from the roasting furnace gas outlet and into the furnace gas pre-washing device, and residual furnace gas at the bottom of the iron oxide powder roasting furnace is discharged from the residual furnace gas outlet.
6. The acid regeneration operation system according to claim 1, further comprising a suction device, wherein the roasting furnace gas is driven into the furnace gas pre-washing device by the suction action of the suction device.
7. The acid regeneration operation system according to claim 1, further comprising a dust remover, wherein the dust remover is arranged on a pipeline connected with the roasting device and the furnace gas pre-washing device, and the dust remover is used for partially separating ferric oxide powder mixed in the roasting furnace gas and returning the ferric oxide powder to the roasting device.
8. The acid regeneration operation system according to claim 1, further comprising a filtering device provided on a line connecting the treated acid collecting device and the treated acid concentrating device to filter the treated acid; the acid regeneration operation system also comprises a furnace gas washing device, the hydrogen chloride absorption device is connected with the furnace gas washing device and is used for conveying the furnace gas to be washed to the furnace gas washing device, and the furnace gas washing device comprises a furnace gas washing tower.
9. An acid regeneration method, characterized in that the acid regeneration of the treated acid is performed by using the acid regeneration operation system according to any one of claims 1 to 8 to obtain a regenerated acid.
10. The acid regeneration method is characterized by comprising the steps of collecting treatment acid, concentrating the treatment acid to obtain concentrated acid, roasting the concentrated acid to obtain ferric oxide powder and roasting furnace gas, wherein part of ferric oxide powder is mixed in the roasting furnace gas; The roasting furnace gas is contacted with first rinsing water to obtain pre-washing liquid and pre-washing furnace gas, the temperature of the pre-washing furnace gas is lower than that of the roasting furnace gas, the pre-washing furnace gas is used for concentrating acid to obtain concentrated acid and furnace gas to be absorbed, the temperature of the furnace gas to be absorbed is lower than that of the pre-washing furnace gas, the furnace gas to be absorbed is contacted with absorption liquid to obtain regenerated acid and furnace gas to be washed, and the absorption liquid comprises pre-washing liquid and second rinsing water.

Description

Acid regeneration operation system and method Technical Field The invention relates to the field of acid regeneration, in particular to an acid regeneration operation system and method. Background The strip steel is subjected to acid washing and rinsing in sequence before acid continuous rolling, the pickling solution obtained after the acid washing is subjected to pretreatment to obtain treatment acid, ferrous chloride is contained in the treatment acid, the treatment acid is concentrated and then roasted in an iron oxide powder roasting furnace to obtain iron oxide powder and furnace gas, and the furnace gas contains hydrogen chloride gas and is doped with part of the iron oxide powder. At present, heat and mass exchange is usually carried out on the furnace gas and the treatment acid in a Venturi preconcentrator, concentration of the treatment acid is carried out, then the furnace gas after heat and mass exchange is conveyed to an absorption tower, regenerated acid is generated in the absorption tower by the furnace gas and rinsing water obtained by rinsing, and the regenerated acid can be used for pickling strip steel. In the acid regeneration process, the furnace gas and the treated acid are subjected to heat exchange, so that part of ferric oxide powder enters the concentrated treated acid along with the furnace gas, the blocking probability of a roasting furnace liquid supply pipe and a roasting furnace injection assembly due to the ferric oxide powder is increased, only a Venturi pre-concentrator is arranged to enable the furnace gas and the treated acid to be subjected to heat exchange, the heat exchange concentration ratio of the high-temperature furnace gas and the treated acid is large, the blocking probability of crystallization of a roasting furnace liquid supply pipe and a nozzle is easy to be caused, in addition, the furnace gas discharged from the Venturi pre-concentrator directly enters a hydrogen chloride absorption tower, the temperature of the furnace gas at the moment is still high, the absorption efficiency of hydrogen chloride is influenced, and the absorption tower is easy to be damaged. In view of the above, it is necessary to provide an acid regeneration operation system and method for solving the technical problems that iron oxide powder is easy to carry in the concentrated post-treatment acid, the concentration ratio of the treatment acid is large, the furnace gas is easy to damage the absorption tower, and the acid regeneration efficiency is low. Disclosure of Invention The invention mainly aims to provide an acid regeneration operation system and method, and aims to solve the technical problems that ferric oxide powder is easy to carry in acid after concentration treatment, the concentration ratio of the treated acid is large, a furnace gas is easy to damage an absorption tower and the acid regeneration efficiency is low. In order to achieve the above object, the present invention provides an acid regeneration operation system, which comprises a treated acid collecting device, a treated acid concentrating device, a roasting device, a furnace gas pre-washing device and a hydrogen chloride absorbing device; the treatment acid concentration device is connected with the roasting device and is used for conveying concentrated acid to the roasting device, roasting to obtain roasting furnace gas and ferric oxide powder, and part of ferric oxide powder is mixed in the roasting furnace gas; The roasting device is connected with the furnace gas pre-washing device, the roasting furnace gas is conveyed to the furnace gas pre-washing device, the roasting furnace gas is contacted with first rinsing water in the furnace gas pre-washing device to obtain pre-washing liquid and pre-washing furnace gas, the furnace gas pre-washing device is connected with the treatment acid concentration device, the pre-washing furnace gas is conveyed to the treatment acid concentration device, the pre-washing furnace gas is contacted with treatment acid in the treatment acid concentration device to obtain concentrated acid and furnace gas to be absorbed, the treatment acid concentration device is connected with the hydrogen chloride absorption device, the furnace gas to be absorbed is conveyed to the hydrogen chloride absorption device, and the furnace gas to be absorbed is contacted with absorption liquid containing the pre-washing liquid to obtain regenerated acid and furnace gas to be washed. The acid regeneration operation system further comprises a rinsing water collecting device, wherein the furnace gas pre-washing device is connected with the rinsing water collecting device and used for conveying the pre-washing liquid to the rinsing water collecting device, the rinsing water collecting device is connected with the hydrogen chloride absorbing device and used for conveying the absorbing liquid to the hydrogen chloride absorbing device, and the rinsing water collecting device is further connected with a rin