Pickling tank system and method for improving pickling turbulence intensity

Abstract

The present invention relates to a pickling tank system and a method for improving the pickling turbulence intensity, the pickling tank system comprises: a tank body, a support stone is provided at the bottom of the tank body, the pickling strip is arranged on the support stone, an inlet stop stone and an outlet stop stone are provided on the width side wall of the tank body; an inlet spray beam and an outlet spray beam are symmetrically arranged above the tank body, and the distance between the inlet spray beam and the outlet spray beam is longer than the length of the tank body; a nozzle is evenly arranged on the inlet spray beam and the outlet spray beam, and the nozzle faces the tank body; a first group of side nozzles are symmetrically arranged on both sides of the tank body, the first group of side nozzles are inclined, and the first group of side nozzles face the inlet stop stone direction in the tank body. The turbulence intensity of the acid solution can be improved, the surface of the strip is fully pickled, the efficiency of the kinetic energy of the side nozzles is improved, and the interference of the swirl flow of the side nozzles on the jets of the spray beams at both ends of the pickling tank can be eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of steel surface quality treatment, in particular to a pickling tank system and a method for improving the pickling turbulence intensity. Background Art

[0002] Pickling of hot rolled strip is a method of removing scale and rust on the surface of steel using acid solution. Among them, the method of increasing the fluidity of the acid solution in the pickling tank, allowing the acid solution on the surface of the strip to be continuously and rapidly renewed, thereby improving the pickling speed and pickling quality is called turbulent pickling.

[0003] In the prior art, such as Figure 1 and Figure 2 The schematic diagram of the pickling tank shown in the figure (usually the pickling production line has three pickling tanks for pickling the strip steel), an inlet spray beam 1' and an outlet spray beam 2' are respectively provided at the upper ends of both sides of the pickling tank, and nozzles 3' are provided on the inlet spray beam 1' and the outlet spray beam 2', overflow tanks 4' are provided on both sides of the pickling tank, a support stone 5' is provided at the bottom of the pickling tank, and an inlet retaining stone 6' and an outlet retaining stone 7' are provided on the side wall of the pickling tank. The acid solution is sprayed from the spray beams inlaid with multiple nozzles 3' at the inlet and outlet of the pickling tank to the surface of the strip steel 9', and the turbulent flow thus established is mainly distributed at both ends of the pickling tank, and the pickling is not sufficient. In addition, there are side nozzles on both sides of the pickling tank, and the existing side nozzle 8' is only 0.1m to 1m away from the inlet retaining stone 6'. During production, a large amount of side sprayed acid solution passes over the pickling tank of the previous level of the inlet retaining stone 6', which brings difficulties to the concentration control of each pickling tank, and most of the kinetic energy of the side nozzle 8' is not converted into turbulent kinetic energy; Figure 3 As shown, the German SMS group adds multiple side nozzles 8' to the side wall of the pickling tank. The side nozzles 8' are relatively staggered, which increases the turbulence intensity in the entire pickling tank to a certain extent. However, the swirl generated by the side nozzles 8' near the two ends of the pickling tank weakens the impact of the jet of the spray beam on the strip 9'. A part of the kinetic energy of the side nozzles 8' pushes the acid solution directly into the overflow troughs 4' at both ends and is wasted. In addition, since the direction of the side nozzles 8' is perpendicular to the running direction of the strip 9', the diffusion range of the turbulent kinetic energy is small, and the turbulence efficiency is not fully exerted.

[0004] Therefore, it is necessary to develop a pickling tank system and a method for improving the turbulent intensity of pickling, which can improve the turbulent intensity of the acid solution and fully pickle the surface of the strip. The position setting of the side nozzle can avoid the waste of the side nozzle kinetic energy, improve the efficiency of the side nozzle kinetic energy, and eliminate the interference of the side nozzle swirl on the jet of the spray beam at both ends of the pickling tank. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the present invention proposes a pickling tank system and a method for improving the pickling turbulence intensity.

[0007] In view of this, one aspect of the present invention provides a pickling tank system, the pickling tank system comprising:

[0008] A trough body, wherein a support stone is arranged at the bottom of the trough body, the pickled strip steel is arranged on the support stone, and an inlet stop stone and an outlet stop stone are arranged on the width side wall of the trough body;

[0009] An inlet spray beam and an outlet spray beam are symmetrically arranged above the slot body, and a distance between the inlet spray beam and the outlet spray beam is longer than a length of the slot body;

[0010] Nozzles, evenly arranged on the inlet spray beam and the outlet spray beam, the nozzles facing the tank body;

[0011] The first group of side nozzles are symmetrically arranged on both sides of the trough body. The first group of side nozzles are inclinedly arranged, and the first group of side nozzles face the direction of the entrance stone block in the trough body.

[0012] Furthermore, the first group of side nozzles is 2m to 5m away from the outlet block stone, and the position where the acid solution is sprayed from the first group of side nozzles to the inner wall of the tank body is 2m to 5m away from the inlet block stone.

[0013] Furthermore, the pickling tank system also includes:

[0014] The second group of side nozzles are symmetrically arranged on both sides of the trough body, the second group of side nozzles are located between the entrance retaining stone and the first group of side nozzles, the second group of side nozzles are inclined, and the second group of side nozzles are oriented toward the entrance retaining stone in the trough body.

[0015] Furthermore, the distance d between the second group of side nozzles and the first group of side nozzles is (L-d1×2) / 2, wherein L is the length of the trough body, and d1 is the distance between the first group of side nozzles and the exit stopper.

[0016] Furthermore, the position where the acid solution is sprayed onto the inner wall of the tank body by the second group of side nozzles is the same as the position where the acid solution is sprayed onto the inner wall of the tank body by the first group of side nozzles.

[0017] Furthermore, the pickling tank system also includes:

[0018] a first acid pump, one end of which is connected to the inlet injection beam and the outlet injection beam, and the other end of which is connected to an acid tank;

[0019] a second acid pump, wherein one end of the second acid pump is connected to the first group of side nozzles and the second group of side nozzles, and the other end of the second acid pump is connected to the acid tank;

[0020] a first motor connected to the first acid pump;

[0021] The second motor is connected to the second acid pump.

[0022] Furthermore, the pickling tank system also includes a side spray flow control unit, and the side spray flow control unit includes:

[0023] A speed sensor is arranged on the shaft head of the pickling steel strip driving roller, and the speed sensor is used to detect the running speed of the pickling steel strip;

[0024] A calculation unit, used to obtain the running speed of the pickled steel strip and the width of the pickled steel strip, obtain collected data, compare the collected data with the parameter table in the calculation unit, and obtain the side spray flow value;

[0025] A control unit is connected to the second motor and controls the spraying flow rates of the first group of side nozzles and the second group of side nozzles according to the side spraying flow rate value of the calculation unit.

[0026] Furthermore, the pickling tank system also includes:

[0027] a first heater, disposed on a connecting pipe between the first acid pump and the inlet spray beam and the outlet spray beam;

[0028] The second heater is arranged on the connecting pipe between the second acid pump and the first group of side nozzles and the second group of side nozzles.

[0029] Furthermore, the pickling tank system also includes:

[0030] A first filter is disposed between the acid tank and the first acid pump;

[0031] The second filter is arranged between the acid tank and the second acid pump.

[0032] Another aspect of the present invention provides a method for improving the pickling turbulence intensity, the method for improving the pickling turbulence intensity comprising:

[0033] According to the requirements of the pickling tank system, install the first set of side nozzles and the second set of side nozzles at different positions and angles;

[0034] The speed sensor is used to collect the running speed of the pickled steel strip, and the running speed and the width of the pickled steel strip are transmitted to the calculation unit;

[0035] Comparing the running speed and the width with the parameter table in the calculation unit to obtain the side spray flow value;

[0036] The calculation unit transmits the side spray flow value to the control unit, and the control unit controls the rotation speed of the second pickling pump according to the side spray flow value;

[0037] The first pickling pump and the second pickling pump are started to pickle the surface of the pickling steel strip through the nozzle, the first group of side nozzles and the second group of side nozzles.

[0038] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0039] By setting the first group of side nozzles obliquely and with the spraying direction opposite to the running direction of the pickled strip, the relative speed of the pickled strip and the acid solution is increased, thereby increasing the turbulence intensity of the acid solution and fully pickling the surface of the strip. By reasonably arranging the first group of side nozzles and the second group of side nozzles, the waste of side spraying kinetic energy is avoided, the efficiency of side spraying kinetic energy is improved, and the interference of the side nozzle swirl on the jet of the spray beam at both ends of the pickling tank can be eliminated.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A side view of a pickling tank of the prior art is shown;

[0044] Figure 2 Shows Figure 1 A top view of

[0045] Figure 3 A schematic diagram of another pickling tank of the prior art is shown;

[0046] Figure 4 A schematic diagram of a pickling tank system according to an embodiment of the present invention is shown;

[0047] Figure 5A top view of a slot body connection according to one embodiment of the present invention is shown;

[0048] Figure 6 A schematic flow chart of a method for improving pickling turbulence intensity according to an embodiment of the present invention is shown.

[0049] in, Figures 1 to 3 The corresponding relationship between the reference numerals and component names in the figure is:

[0050] 1' inlet spray beam, 2' outlet spray beam, 3' nozzle, 4' overflow trough, 5' support stone, 6' inlet retaining stone, 7' outlet retaining stone, 8' side nozzle, 9' strip steel;

[0051] in, Figure 4 and Figure 5 The corresponding relationship between the reference numerals and component names in the figure is:

[0052] 1 tank body, 2 inlet baffle, 3 outlet baffle, 4 inlet injection beam, 5 outlet injection beam, 6 nozzle, 7 first group of side nozzles, 8 second group of side nozzles, 9 first acid pump, 10 second acid pump, 11 acid tank, 12 first motor, 13 second motor, 14 calculation unit, 15 control unit, 16 first heater, 17 second heater, 18 first filter, 19 second filter, 20 overflow tank. DETAILED DESCRIPTION

[0053] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0054] Example 1

[0055] Figure 5 A top view of a slot body connection according to one embodiment of the present invention is shown.

[0056] like Figure 5 As shown, this embodiment provides a pickling tank system, which includes:

[0057] A trough body 1, a support stone is provided at the bottom of the trough body 1, the pickled strip steel is arranged on the support stone, and an inlet stop stone 2 and an outlet stop stone 3 are provided on the width side wall of the trough body 1;

[0058] The inlet spray beam 4 and the outlet spray beam 5 are symmetrically arranged above the slot body 1, and the distance between the inlet spray beam 4 and the outlet spray beam 5 is longer than the length of the slot body 1;

[0059] Nozzles 6 are evenly arranged on the inlet spray beam 4 and the outlet spray beam 5, and the nozzles 6 face the tank body 1;

[0060] The first group of side nozzles 7 are symmetrically arranged on both sides of the tank body 1 . The first group of side nozzles 7 are inclinedly arranged and face the direction of the entrance retaining stone 2 in the tank body 1 .

[0061] By the inclined setting of the first group of side nozzles 7, since the first group of side nozzles 7 are directed toward the entrance baffle 2 in the trough body 1, the spraying direction is opposite to the running direction of the pickled strip, thereby increasing the relative speed between the pickled strip and the acid solution, thereby increasing the turbulence intensity of the acid solution, fully pickling the strip surface, eliminating the root cause of the black surface generated when the pickled strip runs at a low speed, and due to the increase in the turbulence intensity in the trough body 1, the brightness of the strip surface after pickling is improved.

[0062] It should be noted that the inlet baffle 2 and the outlet baffle 3 are located on both sides of the tank body 1 , and their heights are both 160 mm to 200 mm. The function of the inlet baffle 2 and the outlet baffle 3 is to limit the amount of acid solution in the tank body 1 .

[0063] Furthermore, the first group of side nozzles 7 is 2m to 5m away from the outlet block stone 3 , and the position where the acid solution is sprayed from the first group of side nozzles 7 to the inner wall of the tank body 1 is 2m to 5m away from the inlet block stone 2 .

[0064] It should be noted that the distance between the first group of side nozzles 7 and the outlet stopper 3 is equal to the distance between the position of the acid solution sprayed to the inner wall of the tank body 1 by the first group of side nozzles 7 and the inlet stopper 2. In this embodiment, the first group of side nozzles 7 and the outlet stopper 3 are 3m apart.

[0065] It should be noted that the distance between the first group of side nozzles 7 and the outlet baffle 3 is determined based on two points: one is that it is at the boundary of the turbulent flow of the outlet spray beam 5; the other is to avoid the interference of the turbulent flow of the side nozzles on the jets of the inlet spray beam 4 and the outlet spray beam 5, and will not weaken the impact energy of the jets of the inlet spray beam 4 and the outlet spray beam 5 on the surface of the pickling strip, thereby improving the pickling quality of the pickling strip.

[0066] Furthermore, the pickling tank system also includes:

[0067] The second group of side nozzles 8 are symmetrically arranged on both sides of the trough body 1 , and are located between the entrance block stone 2 and the first group of side nozzles 7 . The second group of side nozzles 8 are inclinedly arranged, and the second group of side nozzles 8 are oriented toward the entrance block stone 2 in the trough body 1 .

[0068] In this embodiment, the number of side nozzles is set to four, two in a group, and each group is arranged on two opposite side walls of the pickling tank with symmetrical positions. The purpose of this arrangement is to ensure that the impact force of the side-sprayed acid solution on the pickling strip is symmetrical, and the pickling strip will not be deflected in the tank body 1, thereby preventing the pickling strip from running off the tank body 1.

[0069] Through the reasonable layout of the first group of side nozzles 7 and the second group of side nozzles 8, the waste of side spraying kinetic energy is avoided, the efficiency of side spraying kinetic energy is improved, and the interference of the side nozzle swirl on the jet of the spray beam at both ends of the pickling tank can be eliminated, so that the sprayed acid solution of the inlet spray beam 4 and the outlet spray beam 5 can have a more direct and fierce impact on the pickled strip, which is very effective in eliminating the iron sheet pressure defect of the pickled strip.

[0070] Furthermore, the distance d between the second group of side nozzles 8 and the first group of side nozzles 7 is (L-d1×2) / 2, wherein L is the length of the tank body 1 , and d1 is the distance between the first group of side nozzles 7 and the exit stopper 3 .

[0071] It should be noted that the first group of side nozzles 7 and the second group of side nozzles 8 cannot be too close to the inlet spray beam 4 and the outlet spray beam 5. If they are too close, part of the side-sprayed acid solution will directly flow into the overflow trough 20, resulting in a waste of side-spraying kinetic energy.

[0072] The position where the acid solution is sprayed onto the inner wall of the tank body 1 by the second group of side nozzles 8 is the same as the position where the acid solution is sprayed onto the inner wall of the tank body 1 by the first group of side nozzles 7 .

[0073] The distance d between the second group of side nozzles 8 and the first group of side nozzles 7 is (L-d1×2) / 2, and the position of the acid solution sprayed onto the inner wall of the tank body 1 by the second group of side nozzles 8 is the same as the position of the acid solution sprayed onto the inner wall of the tank body 1 by the first group of side nozzles 7. The purpose of such arrangement is to ensure that the side spraying efficiency is evenly distributed within the tank body 1 and improve the pickling quality.

[0074] Among them, the first group of side nozzles 7 are inclined, and the first group of side nozzles 7 are oriented toward the entrance stone 2 in the tank body 1. The position of the acid solution sprayed to the inner wall of the tank body 1 by the second group of side nozzles 8 is the same as the position of the acid solution sprayed to the inner wall of the tank body 1 by the first group of side nozzles 7, so that the side nozzles have a certain angle with the running direction of the pickled strip, and the side sprayed acid solution is opposite to the forward direction of the pickled strip, which increases the relative speed of the pickled strip and the side sprayed acid solution. Under the same number of side nozzles and acid solution flow rate, the turbulence intensity in the tank body 1 is increased. The inclination angle of each side nozzle can be determined by the line connecting the position (aiming point) of the first group of side nozzles 7 and the second group of side nozzles 8 sprayed to the inner wall of the tank body 1 and the side nozzles, which is convenient for the installation of the first group of side nozzles 7 and the second group of side nozzles 8.

[0075] It should be noted that the liquid level of the acid solution in the trough body 1 is usually determined by the height of the inlet baffle 2 and the outlet baffle 3. The liquid level adopted in this embodiment is 150 mm, wherein the height of the first group of side nozzles 7 and the second group of side nozzles 8 should coincide with the upper surface of the pickled strip in the trough body 1.

[0076] In this embodiment, the length of the tank body 1 is 35 m, and the distance between the second group of side nozzles 8 and the first group of side nozzles 7 is d=(35-3×2) / 2=14.5 m.

[0077] Furthermore, the pickling tank system also includes:

[0078] A first acid pump 9, one end of the first acid pump 9 is connected to the inlet injection beam 4 and the outlet injection beam 5, and the other end of the first acid pump 9 is connected to the acid tank 11;

[0079] A second acid pump 10, one end of the second acid pump 10 is connected to the first group of side nozzles 7 and the second group of side nozzles 8, and the other end of the second acid pump 10 is connected to the acid tank 11;

[0080] A first motor 12 connected to the first acid pump 9;

[0081] The second motor 13 is connected to the second acid pump 10 .

[0082] The first motor 12 drives the first acid pump 9 to work at a variable speed, and the first acid pump 9 supplies acid solution to the inlet injection beam 4 and the outlet injection beam 5; the second motor 13 drives the second acid pump 10 to work at a variable speed, and the acid solution supply amount of the second acid pump 10 is adjusted by changing the rotation speed of the second motor 13. The first motor 12 and the second motor 13 respectively start the first acid pump 9 and the second acid pump 10 at a low speed, wherein the time for the low-speed start is 1 second to 2 seconds, which can prevent the acid solution pipeline from bursting and improve the working stability and service life of the pickling tank system.

[0083] Furthermore, the pickling tank system also includes:

[0084] A first heater 16 is provided on a connecting pipe between the first acid pump 9 and the inlet spray beam 4 and the outlet spray beam 5;

[0085] The second heater 17 is disposed on the connecting pipe between the second acid pump 10 and the first group of side nozzles 7 and the second group of side nozzles 8 .

[0086] The first heater 16 and the second heater 17 are configured to heat the acid solution. The higher the temperature of the acid solution, the faster the acid solution reacts with the iron sheet on the pickled strip. However, when the temperature is too high, the volatilization amount of the acid solution will also increase. Therefore, the first heater 16 and the second heater 17 of this embodiment control the acid solution at 80°C. When under strong turbulent pickling conditions, the temperature of the acid solution can be reduced accordingly.

[0087] Among them, the strong turbulent pickling condition is the condition under which the acid solution flows at a relatively fast speed on the surface of the pickling strip.

[0088] Furthermore, the pickling tank system also includes:

[0089] A first filter 18 is disposed between the acid tank 11 and the first acid pump 9;

[0090] The second filter 19 is disposed between the acid tank 11 and the second acid pump 10 .

[0091] By setting the filter, impurities in the acid solution that are insoluble in hydrochloric acid can be filtered out, thereby improving the purity of the acid solution and further improving the pickling quality.

[0092] In the present embodiment, it should be noted that the side spray flow rate value of the first group of side spray outlets 7 and the side spray flow rate value of the second group of side spray outlets 8 are manually adjusted by staff according to actual conditions.

[0093] The manual / automatic selection switch is switched to the manual position, and the staff increases or decreases the rotation speed of the second acid pump 10 by operating the control button on the operation panel to increase or decrease the side spray flow rate of the first group of side nozzles 7 and the second group of side nozzles 8.

[0094] It should be noted that the pickling tank system further includes overflow tanks 20 arranged on both sides of the tank body 1 .

[0095] During the production process, the acid solution is continuously pumped out from the acid tank 11 by the first acid pump 9 and the second acid pump 10 and sprayed into the tank body 1. The tank body 1 remains full, and the excess acid solution continuously overflows to the overflow tank 20 and returns to the acid tank 11 from the overflow tank 20. This is a cyclic process, which completes two tasks: one is the cyclic heating of the acid solution; the other is to provide kinetic energy for turbulence.

[0096] Example 2

[0097] Figure 4 A schematic diagram of a pickling tank system according to an embodiment of the present invention is shown.

[0098] like Figure 4 As shown, based on Example 1, the pickling tank system of this embodiment further includes a side spray flow control unit 15, and the side spray flow control unit 15 includes:

[0099] The speed sensor is arranged on the shaft head of the pickling strip driving roller, and is used to detect the running speed of the pickling strip;

[0100] The calculation unit 14 is used to obtain the running speed and width of the pickled steel strip, obtain the collected data, compare the collected data with the parameter table in the calculation unit 14, and obtain the side spray flow value;

[0101] The control unit 15 is connected to the second motor 13 and controls the spraying flow rates of the first group of side nozzles 7 and the second group of side nozzles 8 according to the side spraying flow rate value of the calculation unit 14 .

[0102] Among them, speed sensors and speed detection are components common to modern large-scale strip pickling or rolling production lines, and are integrated into the calculation unit 14 and the control unit 15 at any time, wherein the combination of the calculation unit 14 and the control unit 15 is equivalent to a computer system.

[0103] It should be noted that the side spray flow parameter comparison table is shown in Table 1:

[0104] Table 1 Side spray flow rate parameter comparison table

[0105]

[0106] It can be seen from Table 1 that the side spray flow rate value is related to the running speed and width of the pickling strip. The wider the pickling strip is, the larger the surface area that needs to be pickled is, the larger the required side spray flow rate value is, and the corresponding rotation speed of the second acid pump 10 must be increased. In addition, when the running speed of the pickling strip is relatively low, the side spray flow rate value must be increased accordingly to achieve the effect of enhancing the turbulence intensity.

[0107] By inputting the running speed and width of the pickling strip into the calculation unit 14 and comparing them with the parameter table in the calculation unit 14, the side spray flow value is obtained, and the side spray flow value is transmitted to the control unit 15. The control unit 15 controls the rotation speed of the second motor 13 to achieve the change of the side spray flow of the first group of side nozzles 7 and the second group of side nozzles 8, which can improve the pickling efficiency and reduce the work intensity of the staff.

[0108] Since the side spray flow rate is controllable, the turbulence intensity in the tank body 1 is controllable, which fundamentally eliminates the influence of the running speed of the pickling strip on the pickling quality. The pickling speed of wide and thick material production is increased by 25% compared with the original.

[0109] Since Example 2 only changes the manually controlled side spray flow value to the automatically controlled side spray flow value, this example also has all the advantages of the pickling tank system in Example 1.

[0110] Example 3

[0111] Figure 6 A schematic flow chart of a method for improving pickling turbulence intensity according to an embodiment of the present invention is shown.

[0112] like Figure 6 As shown, using the pickling tank system of Example 2, this embodiment provides a method for improving the pickling turbulence intensity, and the method for improving the pickling turbulence intensity includes:

[0113] Step 1, according to the requirements of the pickling tank system, install the first group of side nozzles 7 and the second group of side nozzles 8 at different positions and angles;

[0114] Step 2, collecting the running speed of the pickled steel strip through a speed sensor, and transmitting the running speed and the width of the pickled steel strip to the calculation unit 14;

[0115] Step 3, comparing the running speed and width with the parameter table in the calculation unit 14 to obtain the side spray flow value;

[0116] Step 4, the calculation unit 14 transmits the side spray flow value to the control unit 15, and the control unit 15 controls the speed of the second pickling pump according to the side spray flow value;

[0117] Step 5, start the first pickling pump and the second pickling pump, and pickle the surface of the pickling strip through the nozzle 6, the first group of side nozzles 7 and the second group of side nozzles 8.

[0118] According to the production plan, the width information of the pickled strip has entered the computer system of the production line before the pickled strip is put on the machine, that is, it is stored in the calculation unit 14. The running speed of the pickled strip is monitored at any time by a speed sensor (encoder). These two information are integrated into the side spray flow control unit 15. According to the side spray flow value in Table 1, the rotation speed of the second acid pump 10 is controlled by the control unit 15, thereby controlling the side spray flow of the first group of side nozzles 7 and the second group of side nozzles 8.

[0119] This embodiment is a method for improving the pickling turbulence intensity obtained on the basis of the pickling tank system of Example 2, and therefore has all the advantages of Example 2, which will not be described in detail here.

[0120] Comparative Example

[0121] Table 2 Pickling speed, defects and production capacity of existing technology (vertical side spray)

[0122]

[0123] Table 3 Pickling speed, defects and production capacity of the present invention (angle side spray)

[0124]

[0125] It can be seen from Tables 2 and 3 that the inclined arrangement of the first group of side nozzles 7 and the second group of side nozzles 8 and the spraying in the opposite direction to the running direction of the pickled strip increase the relative speed between the pickled strip and the acid solution, thereby increasing the turbulence intensity of the acid solution, eliminating the root cause of the black surface caused by the low-speed running of the pickled strip, and due to the increase in the turbulence intensity in the trough body 1, the brightness of the strip surface after pickling is improved.

[0126] In addition, due to the reasonable arrangement of the positions of the first group of side nozzles 7 and the second group of side nozzles 8, the interference of the side spray kinetic energy on the jet flow of the inlet spray beam 4 and the outlet spray beam 5 is avoided, so that the impact of the jet flow on the surface of the pickled strip is more direct, and the ability to eliminate iron sheet indentation defects is significantly enhanced, reducing from the original 0.05% to 0.007%.

[0127] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0128] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A pickling tank system, characterized in that: The pickling tank system comprises: A trough body, wherein a support stone is arranged at the bottom of the trough body, the pickled strip steel is arranged on the support stone, and an inlet stop stone and an outlet stop stone are arranged on the width side wall of the trough body; An inlet spray beam and an outlet spray beam are symmetrically arranged above the slot body, and a distance between the inlet spray beam and the outlet spray beam is longer than a length of the slot body; Nozzles, evenly arranged on the inlet spray beam and the outlet spray beam, the nozzles facing the tank body; A first group of side nozzles, symmetrically arranged on both sides of the trough body, the first group of side nozzles are inclinedly arranged, and the first group of side nozzles are oriented toward the entrance stone retaining wall in the trough body; The first group of side nozzles is 2m to 5m away from the outlet block stone, and the position where the acid solution is sprayed from the first group of side nozzles onto the inner wall of the tank body is 2m to 5m away from the inlet block stone; The pickling tank system also includes: A second group of side nozzles are symmetrically arranged on both sides of the trough body, the second group of side nozzles are located between the entrance retaining stone and the first group of side nozzles, the second group of side nozzles are inclinedly arranged, and the second group of side nozzles are oriented toward the entrance retaining stone in the trough body; The distance between the second group of side nozzles and the first group of side nozzles is d=(L-d1×2) / 2, where L is the length of the tank body, and d1 is the distance between the first group of side nozzles and the exit stopper; The position where the acid solution is sprayed onto the inner wall of the tank body by the second group of side nozzles is the same as the position where the acid solution is sprayed onto the inner wall of the tank body by the first group of side nozzles.

2. The pickling tank system according to claim 1, characterized in that: The pickling tank system also includes: a first acid pump, one end of which is connected to the inlet injection beam and the outlet injection beam, and the other end of which is connected to an acid tank; a second acid pump, wherein one end of the second acid pump is connected to the first group of side nozzles and the second group of side nozzles, and the other end of the second acid pump is connected to the acid tank; a first motor connected to the first acid pump; The second motor is connected to the second acid pump.

3. The pickling tank system according to claim 2, characterized in that: The pickling tank system also includes a side spray flow control unit, and the side spray flow control unit includes: A speed sensor is arranged on the shaft head of the pickling steel strip driving roller, and the speed sensor is used to detect the running speed of the pickling steel strip; A calculation unit, used to obtain the running speed of the pickled steel strip and the width of the pickled steel strip, obtain collected data, compare the collected data with the parameter table in the calculation unit, and obtain the side spray flow value; A control unit is connected to the second motor and controls the spraying flow rates of the first group of side nozzles and the second group of side nozzles according to the side spraying flow rate value of the calculation unit.

4. The pickling tank system according to claim 3, characterized in that: The pickling tank system also includes: a first heater, disposed on a connecting pipe between the first acid pump and the inlet spray beam and the outlet spray beam; The second heater is arranged on the connecting pipe between the second acid pump and the first group of side nozzles and the second group of side nozzles.

5. The pickling tank system according to claim 2, characterized in that: The pickling tank system also includes: A first filter is disposed between the acid tank and the first acid pump; The second filter is arranged between the acid tank and the second acid pump.

6. A method for improving the turbulence intensity of pickling, characterized in that: According to the pickling tank system of claim 3, the method for increasing the pickling turbulence intensity comprises: According to the requirements of the pickling tank system, install the first set of side nozzles and the second set of side nozzles at different positions and angles; The speed sensor is used to collect the running speed of the pickled steel strip, and the running speed and the width of the pickled steel strip are transmitted to the calculation unit; Comparing the running speed and the width with the parameter table in the calculation unit to obtain the side spray flow value; The calculation unit transmits the side spray flow value to the control unit, and the control unit controls the rotation speed of the second pickling pump according to the side spray flow value; The first pickling pump and the second pickling pump are started to pickle the surface of the pickling steel strip through the nozzle, the first group of side nozzles and the second group of side nozzles.

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