KR20150073255A

KR20150073255A - Acid rinsing facility and in which acidity control method

Info

Publication number: KR20150073255A
Application number: KR1020130160263A
Authority: KR
Inventors: 박형국; 노일환; 김영우; 김민우
Original assignee: 주식회사 포스코
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2015-07-01

Abstract

According to the present invention, a pickling facility and an acidity control method for the same allow the maintenance of a constant acid concentration of an acid tank by injecting acid to a reproduction tank in accordance with the acidity of the acid tank and the water level of the reproduction tank. Therefore, the present invention allows the rapid acidity control of the acid tank when compared with an existing method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acid rinsing facility and an acidity control method,

The present invention relates to a pickling facility and a pickling facility acid concentration control method, and relates to a pickling facility and a pickling facility acid concentration control method for efficiently controlling an acid concentration of a pickling tank.

Generally, the hot rolled steel sheet is scaled on the surface of the steel sheet in the process of being heat-treated and rolled, and therefore it must be removed. In other words, the scale is often rolled into a rolling roll at the time of cold rolling in a subsequent process, and often becomes a cause of damage to the surface of the steel sheet, so that scale removal is an indispensable process.

Conventionally, scales are often removed using a pickling facility in which a steel plate is immersed in a plurality of acid tanks and passed continuously. However, in the process of picking up various types of steel sheets such as general steel plates, electric steel plates, high tensile steel plates, etc. in the same pickling facility, fluctuation of the acid concentration of the plural acid tanks becomes large, .

In order to maintain the acid concentration of the acid tank in the pickling facility, a method of automatically controlling the amount of hydrochloric acid is used. However, since the volume of the acid tank is as large as 40 m 3 or more, .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for controlling acidity and acidity of an acid tank by controlling the acid tank to maintain the hydrochloric acid concentration of the acid tank at a constant level while maintaining the amount of hydrochloric acid, And the like.

To achieve the above object, a pickling facility according to a preferred embodiment of the present invention includes a mountain tank, a regeneration tank connected to the acid tank, a neon tank connected to the regeneration tank, And a control unit for controlling the amount of neon acid to be supplied to the regeneration tank from the neon tank and controlling the neonate tank supply valve for connecting the neonate tank and the regeneration tank according to the calculation.

Wherein the acid tank is provided with an acid concentration measuring device, the regeneration tank is provided with a water level measuring device, and the controller is connected to the acid concentration measuring device and the water level measuring device, The input amount of the new acid can be calculated in consideration of the water level of the tank.

The regeneration tank may include a first regeneration tank connected to the second acid tank and a second regeneration tank connected to the fourth acid tank, . &Lt; / RTI >

Further, the control unit may calculate an input amount of a new acid into the first regeneration tank in consideration of the acid concentration of the second acid tank and the water level of the first regeneration tank, A first supply valve connected to the regeneration tank, a second regeneration tank connected to the second regeneration tank, and a third regeneration tank connected to the second regeneration tank, And the second supply valve for connecting the second recovery tank to the second recovery tank may be adjusted according to the operation.

According to another aspect of the present invention, there is provided a method for controlling the acid concentration of an acid tank, comprising the steps of: measuring an acid concentration of a acid tank; measuring a level of the tank; A new acid input amount calculation for calculating an acid amount of the acid tank provided in the tank acid concentration measuring step and a reference acid concentration of the acid tank provided in the reproduction tank water level measuring step, step; And a thruster input step of inputting a thruster into the regeneration tank in accordance with the amount of input of the thruster provided in the step of calculating the thruster input amount.

The pickling facility and the pickling apparatus acid concentration control method according to the present invention have the effect of efficiently maintaining the acid concentration of the acid tank without changing the flow rate of the replenishment put into the acid tank.

1 is a view showing a pickling facility.
Fig. 2 is a view showing a flow of acid concentration control in the pickling facility.
3 is a table showing a comparison between the present invention and existing techniques.
FIG. 4 is a view showing a method for controlling the pickling equipment acid concentration.

The pickling facility and the pickling equipment acid concentration control method of the present invention are capable of efficiently controlling the acid concentration of the acid tank 1 without changing the flow rate of the regeneration acid to be supplied to the acid tank 1, The amount of the input new acid into the tank 2 is computed and a new acid is input into the regeneration tank 2 in accordance with the computation.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a view showing a pickling facility. The pickling equipment according to the present invention differs from the conventional pickling equipment in that the acid concentration of the acid tank is controlled by controlling the introduction of the new acid from the new tank to the tank for the reproduction. The control of such a net input is implemented through the control of the pickling plant.

To this end, the pickling facility of the present invention comprises a mountain tank 1, a regeneration tank 2 connected to the acid tank 1, a new tank 80 connected to the regeneration tank 2, 1), and calculates an input amount of the new acid to be supplied to the recovery tank (2) from the new tank (80) And a regeneration tank supply valve (81) for connecting the regeneration tank (2).

That is, the control unit 100 calculates the input amount of the new acid to be supplied to the regeneration tank 2. The controller 100 controls the neonate tank supply valve 81 to supply the neonate into the regeneration tank 2 from the neonate tank 80 according to the input amount of the calculated neonate.

As described above, by increasing the acid concentration of the regenerated acid supplied to the acid tank 1, it is possible to quickly cope with the rapid acid concentration drop in the acid tank 1 have. Fig. 3 is a table comparing the present invention with the conventional method. As shown in Fig. 3, the time required for increasing the acid concentration of the acid tank by 5 g / l is remarkably different from 1 hour to 10 minutes Able to know.

The acid tank 1 is provided with an acid concentration measuring device 3 and the regeneration tank 2 is provided with a water level measuring device 4. The controller 100 is connected to the acid concentration measuring device 3 and the water level measuring device 4 so as to calculate the input amount of the new acid in consideration of the acid concentration of the acid tank 1 and the water level of the regeneration tank 2.

That is, the acid concentration of the acid tank 1 is measured by the acid concentration measuring device 3 provided in the acid tank 1, and the acid concentration of the acid tank 1 is measured by the water level measuring device 4 provided in the regeneration tank 2, The water level of the tank 2 can be measured. The input amount of the new acid is calculated in consideration of the acid concentration of the acid tank 1 thus measured and the water level of the regeneration tank 2. The reference of the acid concentration is used to calculate the amount of the new acid.

Here, the control unit 100 calculates the input amount of the new acid to be supplied to the regeneration tank 2 with the reference concentration and the measured acid concentration of the acid tank 1 as a factor, Can be proportional, integral and derivative (PID), which is a classical control scheme, and other modern control schemes are possible.

More specifically, in the case of the PID logical operation method, the input amount of the new acid can be made to be proportional to the difference between the reference concentration and the acid concentration of the acid tank (1), and the cumulative concentration difference and the rate of change in the concentration difference So that the amount of nitrate input may be determined. Modern control schemes other than PID may be considered, but a classic control scheme is sufficient since the reference acid concentration in the acid tank is not required to be precise.

The first new input amount calculation unit calculates the new input amount in consideration of the water level of the first reproduction tank so that the first reproduction tank will not overflow due to the input of the new acid.

The acid tank 1 includes a first acid tank 20 to a fourth acid tank 50. The regeneration acid tank 2 includes a first regeneration tank 20 connected to the second acid tank 30, A second recovery tank 70 connected to the fourth acid tank 50, and a second recovery tank 70 connected to the fourth acid tank 50.

In the construction of the pickling equipment as described above, the acid concentration control of the acid tank 1 is as follows. That is, the control unit 100 calculates the input amount of the new acid to be supplied to the first regeneration tank 60 in consideration of the acid concentration of the second acid tank 30 and the water level of the first regeneration tank 60 And controls the neon tank first supply valve 82 for connecting the neon tank 80 and the first regeneration tank 60 according to the calculation to adjust the acid concentration of the fourth acid tank 50 2 regeneration tank 70, the amount of input of the neonate to be supplied to the second regeneration tank 70 is calculated, and the neonate tank 80 and the second regeneration tank 70 It is possible to adjust the neonatal tank second supply valve 83 to be connected.

Here, the process of controlling the acid concentration of the acid tank 1 by the controller 100 is as shown in FIG. 2A or 2B. That is, the input amount of the new acid to be supplied to the regeneration tank 2 is calculated by the control unit 100, and the new-tank first supply valve 82 and the new-tank second supply valve 83 Thereby realizing the introduction of the syngas into the regeneration tank 2. When the pickling line is to be stopped, the control unit 100 should not operate. Therefore, when the manual mode switching is input, the control unit 100 stops operating, as shown in FIG.

On the other hand, a method of controlling the acid concentration of the pickling facility can be considered. This will be described with reference to FIG.

That is, as shown in FIG. 4, the acidic plant acid concentration control method of the present invention includes: a acid tank acid concentration measuring step of measuring the acid concentration of the acid tank; a water level measuring step of the reproduction tank for measuring the water level of the reproduction tank; , The input amount of the new acid to be fed into the reproduction tank is calculated using the acid concentration of the acid tank provided in the acid tank acid concentration measurement step, the level of the reproduction tank provided at the reproduction tank water level measurement step, and the reference acid concentration of the acid tank as factors Calculating a new acid input amount; And a thruster input step of inputting a thruster into the regeneration tank in accordance with the amount of input of the thruster provided in the step of calculating the thruster input amount.

The acid concentration control of the acid tank by the pickling equipment acid concentration control method is similar to the acid concentration control of the acid tank by the control unit 100 described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

1: mountain tank 2: regeneration tank
3: acid concentration measuring device 4: water level measuring device
10: Acid recovery facility 20: First acid tank
30: second acid tank 31: second acid tank concentration meter
32: Second acid tank recycle acid supply valve 40: Third acid tank
50: fourth acid tank 51: fourth acid tank concentration meter
52: fourth mountain tank regeneration acid supply valve 60: first regeneration acid tank
61: first regeneration acid tank concentration meter 62: first regeneration acid tank water level meter
70: second regeneration tank 71: second regeneration tank tank concentration meter
72: second regeneration tank water level meter 80: new tank
81: Shinan tank supply valve 82: Shinan tank first supply valve
83: Neutral tank second supply valve 100:

Claims

A regeneration tank 2 connected to the acid tank 1, a neon tank 80 connected to the regeneration tank 2 and a control unit for controlling the acid concentration of the acid tank 1 100)
A neon tank supply valve (not shown) for calculating an input amount of neon acid to be supplied to the regeneration tank 2 from the neon tank 80 and connecting the neon tank 80 to the regeneration tank 2 81).

The method according to claim 1,
The acid tank 1 is provided with an acid concentration measuring device 3,
The regeneration tank 2 is provided with a water level measuring device 4,
The controller 100 is connected to the acid concentration measuring device 3 and the water level measuring device 4 to calculate the input amount of the new acid in consideration of the acid concentration of the acid tank 1 and the water level of the regeneration tank 2 And the pickling equipment.

3. The method of claim 2,
The acid tank 1 includes a first acid tank 20 to a fourth acid tank 50,
The regeneration tank (2)
A first regeneration tank 60 connected to the second acid tank 30,
And a second regeneration tank (70) connected to the fourth acid tank (50).

The method of claim 3,
The control unit (100)
The input amount of the new acid to be supplied to the first regeneration tank 60 is calculated in consideration of the acid concentration of the second acid tank 30 and the water level of the first regeneration tank 60, 80) and the first regeneration tank (60), and a second regeneration tank
The input amount of the new acid to be supplied to the second regeneration tank 70 is calculated in consideration of the acid concentration of the fourth acid tank 50 and the water level of the second regeneration acid tank 70, 80) and the second regeneration storage tank (70).

A control method for controlling an acid concentration of a pickling facility which picks up a steel sheet passing through the pickling tank, including a pickling tank, a regeneration tank, and a pickling tank,
The acid tank acid concentration measuring step (S110) for measuring the acid concentration of the acid tank;
A regeneration tank water level measuring step (S120) for measuring the water level of the regeneration tank;
The input amount of the new acid to be fed into the regeneration tank is determined by taking the acid concentration of the acid tank provided at the acid tank acid concentration measuring step, the level of the regeneration tank provided at the regeneration tank water level measuring step, A new input amount computing step (S130) for computing; And
(S140) of adding a new acid to the regeneration tank according to the amount of the new acid supplied in the step of calculating the amount of new acid;
(S100).