Evaporator and pickling facility low-corrosion treatment device thereof

Abstract

The utility model discloses an evaporator and a pickling facility low-corrosion treatment device thereof. A concentrated acid tank, a first connecting pipe, a diluted acid tank and a second connecting pipe are used for a pickling process and can also be used for alkali neutralization, water washing and blow-drying. After pickling is completed, the acid storage tank can neutralize residual acid, the pipeline is neutralized by alkali and / or flushed by neutralizing liquid, and under the condition that the pump body design is saved, waste acid discharged by pickling of the evaporator can be returned to the tank for treatment, so that environmental acid pollution is avoided; the reduction evaporator and pickling equipment thereof can be further washed and blown off, so that the corrosion risk is greatly reduced; the service life of a tank pipeline is prolonged by more than 50%, the overhaul cost is reduced, the leakage condition is reduced, and the safety coefficient is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial evaporator cleaning, especially an evaporator and pickling facility low corrosion treatment device. BACKGROUND

[0002] The evaporator is suitable for alumina production enterprises and is mainly used for ore pulp heat exchange; after a certain time, the evaporator needs to be pickled. Specifically, the purchased concentrated sulfuric acid is stored in a concentrated acid tank, the concentrated sulfuric acid and water are mixed in a dilute acid tank, and the prepared dilute sulfuric acid is sent to the evaporator needing pickling through a dilute acid pump.

[0003] The evaporator used in industry is not a small device, and the pickling residual liquid is difficult to completely empty, and the residual sulfuric acid is easy to corrode the evaporator and its pickling equipment (mainly pipeline and storage tank). UTILITY MODEL CONTENT

[0004] The utility model aims at at least solving one of the above-mentioned technical problems, and provides an evaporator and pickling facility low corrosion treatment device, which effectively reduces the corrosion of pickling residual liquid on the evaporator and its pickling equipment.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] An evaporator and pickling facility low corrosion treatment device, comprising

[0007] A first connecting pipe, whose two ends are respectively used for connecting a concentrated acid tank and a dilute acid tank;

[0008] A first pump is arranged at the middle segment of the first connecting pipe, and the first pump is suitable for pumping the liquid in the concentrated acid tank to the dilute acid tank through the first connecting pipe;

[0009] A second connecting pipe, whose two ends are respectively used for connecting the dilute acid tank and the evaporator;

[0010] A second pump is arranged at the middle segment of the second connecting pipe, and the second pump is suitable for pumping the liquid in the dilute acid tank to the evaporator through the second connecting pipe;

[0011] Wherein, the first connecting pipe is provided with one pipe and one fork, and a sixth on-off valve between the one pipe and one fork and the dilute acid tank, the one pipe and one fork are suitable for connecting the alkali storage device through a fifth on-off valve, a first alkali pipe, a third pump and a fourteenth on-off valve in sequence,

[0012] The second connecting pipe is provided with two pipes and one fork, and a thirteenth on-off valve between the two pipes and one fork and the evaporator, the two pipes and one fork are suitable for connecting the alkali storage device through a twelfth on-off valve, a second alkali pipe, the third pump and the fourteenth on-off valve in sequence;

[0013] The third pump is connected with the other end of the evaporator through a fifteenth on-off valve, and is adapted to return waste acid in the evaporator to the dilute acid tank.

[0014] Compared with the prior art, the application has the advantages that after the acid pickling is completed, the acid storage tank can neutralize residual acid, the pipeline is neutralized by alkali, and / or is flushed by neutralized liquid, thereby reducing corrosion of the evaporator and the acid pickling equipment; and the waste acid discharged during the acid pickling of the evaporator can be returned to the tank for treatment, thereby avoiding environmental acid pollution.

[0015] As an improvement of the above technical solution, the concentrated acid tank and the dilute acid tank are provided with a PH sensor, and the PH sensor is electrically connected with a display screen adapted to display the PH value.

[0016] As an improvement of the above technical solution, the concentrated acid tank and the dilute acid tank are provided with a PH sensor, and the PH sensor is electrically connected with a display screen adapted to display the PH value.

[0017] As an improvement of the above technical solution, the water inlet of the concentrated acid tank is adapted to inject water into the concentrated acid tank along the tangent direction of the concentrated acid tank, and the water inlet of the dilute acid tank is adapted to inject water into the dilute acid tank along the tangent direction of the dilute acid tank.

[0018] As an improvement of the above technical solution, the second connecting pipe is provided with a ninth on-off valve between the second pump and the dilute acid tank, and the third pump is further adapted to control circulation of the pickling liquid in the evaporator.

[0019] As an improvement of the above technical solution, the first connecting pipe is provided with a third on-off valve between the first pump and the concentrated acid tank, and a one-pipe two-way branch between the first pump and the third on-off valve, and the one-pipe two-way branch is adapted to be connected with an air source through a fourth on-off valve; and the second connecting pipe is provided with a ninth on-off valve between the second pump and the dilute acid tank, and a two-pipe two-way branch between the second pump and the ninth on-off valve, and the two-pipe two-way branch is adapted to be connected with an air source through a tenth on-off valve.

[0020] As an improvement of the above technical solution, the corresponding end of the second connecting pipe extends to the inner bottom of the dilute acid tank.

[0021] As an improvement to the above technical solution, the second connecting pipe is in the dilute acid tank and is suitable for injecting and draining liquid tangentially along the dilute acid tank. The port of the second connecting pipe located at the bottom of the dilute acid tank is a flat opening, and the lower lip of the flat opening is attached to the bottom of the dilute acid tank.

[0022] As an improvement to the above technical solution, the corresponding end of the first connecting pipe extends to the inner bottom of the concentrated acid tank.

[0023] As an improvement to the above technical solution, the first connecting pipe is in the concentrated acid tank and is suitable for injecting and draining liquid tangentially along the concentrated acid tank. The port of the first connecting pipe located at the bottom of the concentrated acid tank is a flat opening, and the lower lip of the flat opening is attached to the bottom of the concentrated acid tank. Attached Figure Description

[0024] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the low-corrosion treatment device for the evaporator and its acid washing facility according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A flowchart is shown showing the process of acid washing performed by the low-corrosion treatment unit of the evaporator and its acid washing facility.

[0027] Figure 3 for Figure 1 A flowchart is shown showing the process of acid washing performed by the low-corrosion treatment unit of the evaporator and its acid washing facility.

[0028] Figure 4 for Figure 1 A flowchart is shown showing the process of water washing performed by the low-corrosion treatment unit of the evaporator and its acid washing facility.

[0029] Figure 5 for Figure 1 A flowchart is shown showing the purging process performed by the low-corrosion treatment unit of the evaporator and its acid washing facility.

[0030] Figure 6 for Figure 1 A schematic diagram of the acid storage tank structure of the evaporator and its acid washing facility's low-corrosion treatment unit is shown.

[0031] Figure 7 for Figure 6 A schematic diagram of the flat opening of the connecting pipe of the acid storage tank is shown.

[0032] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0033] Concentrated acid tank 110, dilute acid tank 120;

[0034] a first connecting pipe 210 and a second connecting pipe 220;

[0035] a first alkali pipe 310 and a second alkali pipe 320;

[0036] a first pump B1, a second pump B2 and a third pump B3;

[0037] a first on-off valve F1, a second on-off valve F2, a third on-off valve F3, a fourth on-off valve F4, a fifth on-off valve F5, a sixth on-off valve F6, a seventh on-off valve F7, an eighth on-off valve F8, a ninth on-off valve F9, a tenth on-off valve F10, a twelfth on-off valve F12, a thirteenth on-off valve F13, a fourteenth on-off valve F14 and a fifteenth on-off valve F15. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0039] With reference to Figure 1 The present application provides an evaporator and a low-corrosion treatment device for pickling facilities thereof, comprising:

[0040] The first connecting pipe 210 is used for connecting the concentrated acid tank 110 and the dilute acid tank 120.

[0041] The first pump B1 is arranged at the middle segment of the first connecting pipe 210, and is adapted to draw the liquid in the concentrated acid tank 110 to the dilute acid tank 120 through the first connecting pipe 210.

[0042] The second connecting pipe 220 is used for connecting the dilute acid tank 120 and the evaporator.

[0043] The second pump B2 is arranged at the middle segment of the second connecting pipe 220, and is adapted to draw the liquid in the dilute acid tank 120 to the evaporator through the second connecting pipe 220.

[0044] The first connecting pipe 210 is provided with a one-pipe one-fork opening and a sixth on-off valve F6 between the one-pipe one-fork opening and the dilute acid tank 120, and the one-pipe one-fork opening is adapted to be connected to the alkali storage device in sequence through the fifth on-off valve F5, the first alkali pipe 310, the third pump B3 and the fourteenth on-off valve F14,

[0045] The second connecting pipe 220 is provided with a two-pipe one-fork opening and thirteen on-off valves F13 between the two-pipe one-fork opening and the evaporator, and the two-pipe one-fork opening is adapted to communicate with the alkali storage device through the twelve on-off valves F12, the second alkali pipe 320, the third pumping device B3 and the fourteen on-off valves F14 in sequence.

[0046] The third pumping device B3 communicates with the other end of the evaporator through the fifteen on-off valves F15, and the third pumping device B3 is also adapted to return the waste acid in the evaporator to the dilute acid tank 120, and the other end of the evaporator is adapted to discharge materials outward through the sixteen on-off valves F16.

[0047] It can be understood that the on-off valve is used to control the conduction and stop of the pipeline, such as a ball valve, a gate valve, a butterfly valve, a stop valve, a needle valve, etc.

[0048] In practice, the purchased concentrated sulfuric acid is not stable in each batch, and the acidity cannot be strictly accurate, so in pickling, the corresponding amount of alkali cannot be completely extracted according to the amount of acid. Preferably, the concentrated acid tank 110 and the dilute acid tank 120 are provided with a PH sensor, and the PH sensor is electrically connected with a display screen such as a digital screen or a liquid crystal screen adapted to display the PH value. According to the feedback value of the PH sensor, the alkali is intermittently extracted into the storage tank to gradually approach 7. It can be understood that the amount of alkali gradually decreases, that is, according to the mechanism of coarse first and fine later, the PH gradually tends to be neutral from acidic.

[0049] In some settings, the on-off valve is controlled by a rotating handle or a hand lever. In some settings, the on-off valve includes or is connected with a corresponding electromagnet, and the opening and closing of the on-off valve is controlled by the electromagnet. The pumping device is electrically connected with a corresponding AC contactor / relay, and the start and stop of the pumping device is controlled by the AC contactor / relay.

[0050] In some settings, the center console of the central control room is provided with a plurality of switches, and each on-off valve and pumping device is controlled by a corresponding switch. In some settings, the central control room is provided with a central controller, which can be a PLC, a single-chip microcomputer, etc. Each PH sensor, electromagnet and AC contactor / relay is electrically connected with the central controller, and the programming stored in the central controller includes the amount of alkali added each time and the duration of intermittent addition of alkali (i.e. the duration of acid-alkali mixing).

[0051] It can be understood that "first A, second A, third, …, xA" does not refer to x A features in each embodiment, "one B, two B, three B, …, xB" does not refer to x B features in each embodiment, and "first A, second A, third A, …, xA", "one B, two B, three B, …, xB" are only used for naming features to distinguish between each specific embodiment and the same type of features within each specific embodiment.

[0052] It can be understood that the evaporator includes a main channel and a secondary channel, one of which is used to flow the heat medium, and the other is used to flow the ore slurry, and the ore slurry is suitable for absorbing the heat of the heat medium or conducting the heat to the heat medium. The former evaporator one end and the other end refer to the two ends of the main channel or the two ends of the secondary channel; that is, the two ends of the channel that needs to be cleaned at a time.

[0053] In some embodiments, the concentrated acid tank 110 and the dilute acid tank 120 are discharged by corresponding pumps. In some embodiments, the bottom of the concentrated acid tank 110 and / or the dilute acid tank 120 is provided with a blowdown port, the blowdown port of the concentrated acid tank 110 is communicated with a second on-off valve F2, the blowdown port of the dilute acid tank 120 is communicated with an eighth on-off valve F8, and the concentrated acid tank 110 and the dilute acid tank 120 can be discharged separately or concentrated.

[0054] The operation process of the utility model can be as follows: shutdown, after the evaporator stops ore slurry heat exchange, the channel of the evaporator that needs to be cleaned is communicated with the low-corrosion treatment device of the evaporator and the pickling equipment of the utility model, that is, one end of the evaporator is communicated with the second connecting pipe 220, and the other end is communicated with the liquid inlet of the third pump B3 through the fifteenth on-off valve F15.

[0055] The pickling evaporator is suitable for containing purchased concentrated sulfuric acid in the concentrated acid tank 110, and a certain amount of water is put into the dilute acid tank 120. Figure 1 and Figure 2 The sixth on-off valve F6 is opened, the fifth on-off valve F5 is closed, the dilute acid tank 120 is pumped into the concentrated sulfuric acid in the concentrated acid tank 110 through the first pump B1, that is, the concentrated sulfuric acid and the water in the dilute acid tank 120 are mixed into dilute sulfuric acid, and Figure 1 and Figure 2 The thirteenth on-off valve F13 is opened, the twelfth on-off valve F12 is closed, one end of the evaporator is pumped into the dilute sulfuric acid in the dilute acid tank 120 through the second pump B2, the channel of the evaporator that needs to be cleaned is filled with dilute sulfuric acid, and the dilute sulfuric acid is suitable for dissolving the residual material (remaining ore or heat medium) in the channel.

[0056] Among them, the evaporator can adopt the mode of continuous acid filling and continuous waste discharge: that is (provided with a discharge pipe and a sixteenth on-off valve F16, the fifteenth on-off valve F15 is closed, the fourteenth on-off valve F14 is closed, and the sixteenth on-off valve F16 is opened), the other end of the evaporator continuously discharges waste (dilute acid, residual material and / or molten liquid), when the other end of the evaporator is mainly for discharging acid, it is determined that the channel is completed pickling, and this mode consumes more acid.

[0057] The evaporator can also adopt the mode of immersion pickling (the evaporator under this mode can not be provided with a blowdown pipe and a sixteenth on-off valve F16), the evaporator is filled with acid for a certain period of time, or the output end of the second pump B2 is pumped to a certain degree, it is determined that the evaporator is filled with sufficient dilute acid, the second pump B2 is closed, and the evaporator is stationary for a certain period of time to melt the residual material.

[0058] The evaporator can also be subjected to a circulating acid washing (in this mode, the evaporator can be provided without a blowdown pipe and a sixteenth on-off valve F16). When the evaporator starts to be filled with acid, the third pump B3 can be started, and the twelfth on-off valve F12 is opened and the fourteenth on-off valve F14 is closed. The evaporator is subjected to a circulating flow of the acid washing liquid. Further preferably, as described below, a ninth on-off valve F9 is provided (i.e., the ninth on-off valve F9 is opened when the evaporator is filled with acid). After the second pump B2 is operated to a certain degree, it is determined that the evaporator is filled with sufficient dilute acid. At this time, the ninth on-off valve F9 can be closed and the second pump B2 can be stopped. The evaporator is subjected to a certain time of circulating acid washing.

[0059] The acid return process is described with reference to Figure 1 and Figure 2 The thirteenth on-off valve F13 is closed, the ninth on-off valve F9 is opened, the twelfth on-off valve F12 is opened, and the fifteenth on-off valve F15 is opened. The third pump B3 draws the waste liquid (waste acid and acid washing products) after the acid washing of the evaporator back to the dilute acid tank 120.

[0060] The alkali neutralization pipe and tank bottom are described with reference to Figure 1 and Figure 3 On the one hand, the fifteenth on-off valve F15 is closed, the fourteenth on-off valve F14 is opened, the fifth on-off valve F5 is opened, and the sixth on-off valve F6 is closed. The first alkali pipe 310 passes through the first connecting pipe 210 to fill the concentrated acid tank 110 with alkali.

[0061] After the neutralization of the concentrated acid tank 110 is completed, the fifth on-off valve F5 is closed, the first pump B1 is opened, and the sixth on-off valve F6 is opened. The first connecting pipe 210 is flushed with the neutralization liquid.

[0062] On the other hand, the fifteenth on-off valve F15 is closed, the fourteenth on-off valve F14 is opened, the twelfth on-off valve F12 is opened, and the thirteenth on-off valve F13 is closed. The second alkali pipe 320 passes through the second connecting pipe 220 to fill the dilute acid tank 120 with alkali.

[0063] After the neutralization of the dilute acid tank 120 is completed, the twelfth on-off valve F12 is closed, the second pump B2 is opened, the thirteenth on-off valve F13 is opened, and the sixteenth on-off valve F16 is opened. The second connecting pipe 220 and the evaporator are flushed with the neutralization liquid, and the neutralization liquid is discharged through the aforementioned other end of the evaporator.

[0064] Further, the water flushing process and the blow-drying process described below can also be included. Figure 1 , Figure 4 and Figure 5

[0065] It can be understood that most of the pumps allow a certain degree of backflow, such as a centrifugal pump with a certain porosity, an axial flow pump, a mixed flow pump, and a gear pump that allows free reversal.

[0066] ​Compared with the prior art, the beneficial effects of the present application include: after the evaporator and the pickling equipment thereof complete pickling, the acid storage tank can neutralize residual acid, the pipeline is subjected to alkali neutralization and / or is subjected to flushing of the neutralization liquid, and the corrosion of the evaporator and the pickling equipment thereof is reduced; in the case of saving pump body design, the waste acid discharged in the pickling of the evaporator can be treated in the tank, and environmental acid pollution is avoided.

[0067] With reference to Figure 1 and Figure 6 In some embodiments of the present application, the concentrated acid tank 110 and the dilute acid tank 120 are both provided with a water inlet at the upper end and a sewage outlet at the lower bottom, the concentrated acid tank 110 is adapted to discharge waste water through the sewage outlet thereof and / or is adapted to discharge waste water to the dilute acid tank 120 through the first suction pump B1, so that the first connecting pipe 210 is also subjected to water flushing, and the dilute acid tank 120 is adapted to discharge waste water through the sewage outlet thereof and / or is adapted to discharge waste water to the evaporator through the second suction pump B2, so that the second connecting pipe 220 and the evaporator are also subjected to water flushing. In the same set of suction pump pipeline, after the residual acid is neutralized, the concentrated acid tank 110, the first connecting pipe 210, the dilute acid tank 120, the second connecting pipe 220 and the evaporator can be washed with water, and the corrosion of the evaporator and the pickling equipment thereof is further reduced.

[0068] With reference to Figure 1 The water inlet of the concentrated acid tank 110 is communicated with the first on-off valve F1, and the water inlet of the dilute acid tank 120 is communicated with the seventh on-off valve F7.

[0069] With reference to Figure 6 In some embodiments of the present application, the water inlet of the concentrated acid tank 110 injects water into the concentrated acid tank 110 along the tangential direction of the concentrated acid tank 110, and the water inlet of the dilute acid tank 120 injects water into the dilute acid tank 120 along the tangential direction of the dilute acid tank 120. When the concentrated acid tank 110 and the dilute acid tank 120 inject water, the clear water rotates in the tank, and the flushing is accelerated.

[0070] With reference to Figure 1 In some embodiments of the present application, the second connecting pipe 220 is provided with the ninth on-off valve F9 located between the second suction pump B2 and the dilute acid tank 120, and the third suction pump B3 is also adapted to control the circulation flow of the pickling liquid in the evaporator, so that the evaporator performs cyclic pickling, the pickling effect of sulfuric acid is improved, and sulfuric acid is saved.

[0071] With reference to Figure 1In some embodiments of the utility model, first connecting pipe 210 is provided with third on-off valve F3 between first pump B1 and concentrated acid tank 110, and one pipe two bifurcations between first pump B1 and third on-off valve F3, one pipe two bifurcations are adapted to communicate air source through fourth on-off valve F4, second connecting pipe 220 is provided with ninth on-off valve F9 between second pump B2 and dilute acid tank 120, and two pipe two bifurcations between second pump B2 and ninth on-off valve F9, two pipe two bifurcations are adapted to communicate air source through tenth on-off valve F10. Air source can be fan, air compressor, compressed gas tank etc. In the utility model, after alkali neutralization or even water washing, it can be further air blown clean.

[0072] Refer to Figure 6 In some embodiments of the utility model, the corresponding end of second connecting pipe 220 extends to the inner bottom of dilute acid tank 120, which facilitates the sufficient pumping of the neutralizing liquid in dilute acid tank 120 to the evaporator, and the sufficient discharge of the neutralizing liquid in dilute acid tank 120.

[0073] Refer to Figure 6 And Figure 7 In some embodiments of the utility model, second connecting pipe 220 is in dilute acid tank 120, and is adapted to inject and discharge liquid along the tangential direction of dilute acid tank 120, the port of second connecting pipe 220 at the inner bottom of dilute acid tank 120 is a flat mouth, and the lower lip of the flat mouth abuts against the inner bottom of dilute acid tank 120. Injecting alkali into dilute acid tank 120, the alkali liquid in the tank rotates in a cyclone, fully and quickly neutralizing residual acid; flushing liquid with the flat mouth abutting against the bottom, quickly neutralizing residual acid, and sucking liquid with the flat mouth abutting against the bottom, fully discharging neutralizing liquid and waste water.

[0074] Refer to Figure 6 In some embodiments of the utility model, the corresponding end of first connecting pipe 210 extends to the inner bottom of concentrated acid tank 110, which facilitates the sufficient pumping of the neutralizing liquid in dilute acid tank 120 to the evaporator, and the sufficient discharge of the neutralizing liquid in dilute acid tank 120.

[0075] Refer to Figure 6 And Figure 7 In some embodiments of the utility model, first connecting pipe 210 is in concentrated acid tank 110, and is adapted to inject and discharge liquid along the tangential direction of concentrated acid tank 110, the port of first connecting pipe 210 at the inner bottom of concentrated acid tank 110 is a flat mouth, and the lower lip of the flat mouth abuts against the inner bottom of concentrated acid tank 110. Fully applying concentrated sulfuric acid in concentrated acid tank 110 to dilute acid tank 120, and accelerating the cyclone of alkali liquid when adding alkali, to speed up alkali neutralization.

[0076] The above embodiments are only used to illustrate the technical solutions of the utility model and not to limit it, any modification or equivalent replacement without departing from the spirit and scope of the utility model should be covered in the scope of the technical solutions of the utility model.

Claims

1. A low-corrosion treatment device for an evaporator and its acid washing facility, characterized in that, include: The first connecting pipe has its two ends used to connect the concentrated acid tank and the dilute acid tank, respectively. A first pump is installed in the middle section of the first connecting pipe. The first pump is adapted to pump the liquid in the concentrated acid tank to the dilute acid tank through the first connecting pipe. The second connecting pipe has its two ends used to connect the dilute acid tank and the evaporator, respectively. The second pump is located in the middle section of the second connecting pipe. The second pump is adapted to pump the liquid in the dilute acid tank to the evaporator through the second connecting pipe. The first connecting pipe is equipped with a fork in the main pipe and a sixth shut-off valve located between the fork in the main pipe and the dilute acid tank. The fork in the main pipe is adapted to connect to the alkali storage tank in sequence through the fifth shut-off valve, the first alkali pipe, the third pump, and the fourteenth shut-off valve. The second connecting pipe is provided with a two-pipe one-fork joint and a thirteen-way shut-off valve located between the two-pipe one-fork joint and the evaporator. The two-pipe one-fork joint is adapted to connect to the alkali storage tank in sequence through the twelve-way shut-off valve, the second alkali pipe, the third pump and the fourteen-way shut-off valve. The third pump is connected to the other end of the evaporator through a fifteen-way shut-off valve. The third pump is also adapted to return the waste acid in the evaporator to the dilute acid tank. The aforementioned other end of the evaporator is adapted to discharge material outward through a sixteen-way shut-off valve.

2. The low-corrosion treatment device for the evaporator and its acid washing facility according to claim 1, characterized in that, Both the concentrated acid tank and the dilute acid tank are equipped with pH sensors, and the pH sensors are electrically connected to a display screen suitable for displaying pH values.

3. The low-corrosion treatment device for the evaporator and its acid washing facility according to claim 1, characterized in that, Both the concentrated acid tank and the dilute acid tank have a water inlet at the top and a drain outlet at the bottom. The concentrated acid tank is suitable for discharging wastewater through its drain outlet and / or for discharging wastewater into the dilute acid tank through the first pump. The dilute acid tank is suitable for discharging wastewater through its drain outlet and / or for discharging wastewater into the evaporator through the second pump.

4. The low-corrosion treatment device for the evaporator and its acid washing facility according to claim 3, characterized in that, The water inlet of the concentrated acid tank injects water into the concentrated acid tank along the tangential direction of the concentrated acid tank, and the water inlet of the dilute acid tank injects water into the dilute acid tank along the tangential direction of the dilute acid tank.

5. The evaporator and its acid washing facility low-corrosion treatment apparatus according to any one of claims 1 to 4, characterized in that, The second connecting pipe is equipped with a ninth on / off valve located between the second pump and the dilute acid tank, and the third pump is also adapted to control the acid pickling solution to circulate in the evaporator.

6. The evaporator and its acid washing facility low-corrosion treatment apparatus according to any one of claims 1 to 4, characterized in that, The first connecting pipe is provided with a third on / off valve located between the first pump and the concentrated acid tank, and a two-way pipe located between the first pump and the third on / off valve, the two-way pipe being adapted to connect to a gas source through a fourth on / off valve; the second connecting pipe is provided with a ninth on / off valve located between the second pump and the dilute acid tank, and a two-way pipe located between the second pump and the ninth on / off valve, the two-way pipe being adapted to connect to a gas source through a tenth on / off valve.

7. The evaporator and its acid washing facility low-corrosion treatment apparatus according to any one of claims 1 to 4, characterized in that, The corresponding end of the second connecting pipe extends to the inner bottom of the dilute acid tank.

8. The low-corrosion treatment device for the evaporator and its acid washing facility according to claim 7, characterized in that, The second connecting pipe is in the dilute acid tank and is suitable for injecting and draining liquid tangentially along the dilute acid tank. The port of the second connecting pipe located at the bottom of the dilute acid tank is a flat opening, and the lower lip of the flat opening is attached to the bottom of the dilute acid tank.

9. The evaporator and its acid washing facility low-corrosion treatment apparatus according to any one of claims 1 to 4, characterized in that, The corresponding end of the first connecting pipe extends to the inner bottom of the concentrated acid tank.

10. The low-corrosion treatment device for the evaporator and its acid washing facility according to claim 9, characterized in that, The first connecting pipe is in the concentrated acid tank and is adapted to inject and drain liquid tangentially along the concentrated acid tank. The port of the first connecting pipe located at the bottom of the concentrated acid tank is a flat opening, and the lower lip of the flat opening is attached to the bottom of the concentrated acid tank.

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