Cleaning system for scabs in tank after dissolution

Abstract

The utility model relates to a scabbing cleaning system for a post-dissolution tank, which belongs to the technical field of post-dissolution tank cleaning and comprises a post-dissolution tank, a soda boiling pump, an alkali liquor pump and a connecting pipeline, one end of the connecting pipeline is connected with an alkali inlet of the post-dissolution tank, the other end of the connecting pipeline is connected with an alkali outlet of the post-dissolution tank, and the other end of the connecting pipeline is connected with an alkali outlet of the post-dissolution tank. The alkali boiling pump is mounted on the connecting pipeline, a branch pipeline is arranged on the connecting pipeline, the branch pipeline is connected with an alkali liquor tank, the alkali liquor pump is arranged on the branch pipeline, and a heating assembly for performing liquid heat exchange on alkali liquor in the dissolved-out tank is further arranged on the connecting pipeline. The device has the effect of safely and efficiently cleaning the dissolved tank with low energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of post-dissolution tank cleaning, in particular to a post-dissolution tank scab cleaning system. BACKGROUND

[0002] In the production of alumina by the Bayer process, the raw material slurry after high temperature and high pressure dissolution will obtain a high solid content of the dissolution slurry, in order to facilitate the separation of sodium aluminate solution and solid impurities, the post-dissolution tank device is used to dilute the dissolution slurry.

[0003] After the post-dissolution tank is used for a long time, the slurry will form a large number of scabs on the tank wall, the bottom and the attached stirring facilities with the change of temperature and concentration. At present, the main way to remove the scabs of the post-dissolution tank is to first withdraw the tank from the process and empty the material, then personnel enter the high-positioned cage to clean the scabs manually using a pneumatic pick, and the cleaned scabs are transported to the raw material field for reuse.

[0004] However, during the manual cleaning process, there are many safety hazards, such as high-altitude falling and object impact. At the same time, the manual cleaning period is long, which is not conducive to the standby of the tank. With the rapid development of alumina process, some chemical scab removal technologies have also appeared, such as dilute sulfuric acid pickling pipeline technology and alkali washing of the settling tank technology. However, in actual application, the former cannot be applied to large tanks without plastic lining, and the latter greatly increases energy consumption due to steam temperature raising and full tank operation, and the alkali washing is not complete and there are many residues, which does not meet the current market competition environment of reducing cost and increasing efficiency. Therefore, there is an urgent need for a safer, more efficient and low-energy consumption post-dissolution tank cleaning method. CONTENT OF THE INVENTION

[0005] In order to provide a safe, efficient and low-energy consumption post-dissolution tank cleaning method, the present application provides a post-dissolution tank scab cleaning system.

[0006] The post-dissolution tank scab cleaning system provided by the present application adopts the following technical scheme:

[0007] A post-dissolution tank scab cleaning system, comprising a post-dissolution tank, an alkali boiling pump, an alkali pump and a connecting pipeline, one end of the connecting pipeline is connected with an alkali inlet of the post-dissolution tank, the other end of the connecting pipeline is connected with an alkali outlet of the post-dissolution tank, the alkali boiling pump is installed on the connecting pipeline, a branch pipeline is arranged on the connecting pipeline, the branch pipeline is connected with an alkali tank, the alkali pump is arranged on the branch pipeline, and a heating assembly for liquid heat exchange of alkali in the post-dissolution tank is further arranged on the connecting pipeline.

[0008] By adopting the technical scheme, the lye is continuously and stably delivered from the lye tank to the post-dissolution tank by the lye pump, the circulation of the lye in the post-dissolution tank is realized by the lye boiling pump, the circulation cleaning is realized, and the heating assembly can heat the lye in the circulation process, which helps to accelerate the dissolution and falling of the scabs, further improves the cleaning efficiency, compared with the traditional manual cleaning and chemical elimination method, the lye is recycled for cleaning, the waste of the lye is reduced, the cleaning cost is reduced, and the lye can be heated by the heating assembly, unnecessary energy consumption is avoided, and the energy utilization efficiency is improved.

[0009] Optionally, the heating assembly comprises a heating sleeve fixed on the connecting pipeline and a settling tank, and the heating sleeve is connected with the settling tank.

[0010] By adopting the technical scheme, the lye is heated by the heating sleeve and the settling tank, which not only helps to transfer and recover heat, but also enhances the heat exchange effect of the system. In the circulation process of the lye, the heating sleeve transfers heat to the lye, so that the temperature of the lye is increased. The settling tank serves as a heat receiving and storing unit, and can further utilize the heat for other process operations or preheat the lye newly entering the system, thereby improving the energy utilization efficiency.

[0011] Optionally, the heating assembly further comprises a coarse liquid pipe, one end of the heating sleeve is connected with an inlet pipe, the other end of the heating sleeve is connected with an outlet pipe, the inlet pipe and the outlet pipe are connected with the coarse liquid pipe respectively, the inlet pipe is connected with an inlet end of the coarse liquid pipe, the outlet pipe is connected with an outlet end of the coarse liquid pipe, the coarse liquid pipe is connected with the settling tank, and a first control valve is installed on the coarse liquid pipe between the inlet pipe and the outlet pipe.

[0012] By adopting the technical scheme, the coarse liquid pipe serves as the main channel connecting the heating sleeve and the settling tank, which can ensure that the lye flows into the settling tank smoothly after completing heat exchange in the heating sleeve.

[0013] Optionally, a second control valve is installed on the branch pipeline between the lye pump and the post-dissolution tank.

[0014] Optionally, a purge pipeline is connected to the connecting pipeline and the heating sleeve.

[0015] By adopting the technical scheme, the purge pipeline uses high-pressure gas or liquid to purge the connecting pipeline and the heating sleeve, so as to remove the residues and scabs in the pipeline.

[0016] Optionally, a third control valve is installed on the inlet pipe and the outlet pipe.

[0017] Optionally, the fourth control valve is installed on the connecting pipeline at the inlet end and the outlet end of the alkali cooking pump.

[0018] Optionally, the fifth control valve is installed on the connecting pipeline at the two ends of the heating jacket.

[0019] Optionally, the liquid level detection module is installed in the post-dissolution tank, the control module is electrically connected to the liquid level detection module, the control module is electrically connected to the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve, and the control module is also electrically connected to the alkali cooking pump and the alkali pump.

[0020] By adopting the above technical scheme, the liquid level detection module can monitor the liquid level change in the post-dissolution tank in real time, and transmit the data to the control module. The control module automatically controls the opening and closing of each control valve and the start and stop of the pump according to the data provided by the liquid level detection module, which not only improves the operation efficiency of the system, but also reduces the error and labor intensity of manual intervention.

[0021] Optionally, the temperature detection module is also installed in the post-dissolution tank, and the temperature detection module is electrically connected to the control module.

[0022] By adopting the above technical scheme, the temperature detection module can monitor the temperature change in the post-dissolution tank in real time, and transmit the data to the control module. The control module can realize heating control according to the data provided by the temperature detection module, so as to keep the alkali in the tank within a suitable range.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The alkali pump continuously and stably transports the alkali from the alkali tank to the post-dissolution tank, the alkali cooking pump realizes the circulation of the alkali in the post-dissolution tank, realizes the circulation cleaning, and the heating assembly can heat the alkali during the circulation of the alkali, which helps to accelerate the dissolution and shedding of the scab, further improves the cleaning efficiency, compared with the traditional manual cleaning and chemical elimination method, the alkali is recycled for cleaning, which reduces the waste of alkali, reduces the cleaning cost, and the heating assembly can heat the alkali, which avoids unnecessary energy consumption and improves the energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a post-dissolution tank scab cleaning system in embodiment 1.

[0026] Figure 2 is a structure block diagram of the control module control in embodiment 2.

[0027] Explanation of reference signs: 1, dissolving tank; 11, lye pump; 12, alkali pump; 13, connecting pipeline; 131, purging pipeline; 14, branch pipeline; 2, heating sleeve; 21, coarse liquid pipe; 22, liquid inlet pipe; 23, liquid outlet pipe; 3, first control valve; 31, second control valve; 32, third control valve; 33, fourth control valve; 34, fifth control valve; 4, liquid level detection module; 41, temperature detection module; 42, control module. DETAILED DESCRIPTION

[0028] The following will be described in detail with reference to the accompanying drawings. Figures 1-2 The application is further described in detail.

[0029] Example 1

[0030] The embodiment of the application discloses a dissolving tank scab cleaning system. Figure 1 The dissolving tank scab cleaning system comprises a dissolving tank 1, a lye pump 11, an alkali pump 12 and a connecting pipeline 13, one end of the connecting pipeline 13 is connected with an alkali inlet of the dissolving tank 1, the other end of the connecting pipeline 13 is connected with an alkali outlet of the dissolving tank 1, wherein the alkali inlet is located on the side of the dissolving tank 1 far away from the ground, the alkali outlet is located on the side wall of the dissolving tank 1 close to the ground, the lye pump 11 is installed at the position of the connecting pipeline 13 close to the alkali outlet, a branch pipeline 14 is fixedly connected at the position of the connecting pipeline 13 close to the alkali inlet, the branch pipeline 14 is connected with an alkali tank (not shown in the figure), the alkali pump 12 is installed on the branch pipeline 14, and a heating assembly for heating alkali in the dissolving tank 1 is arranged on the connecting pipeline 13.

[0031] When it is necessary to clean the scab of the dissolving tank 1, the alkali pump 12 is started, the alkali pump 12 draws alkali in the alkali tank to the dissolving tank 1, when the alkali in the dissolving tank 1 is sufficient, the alkali pump 12 is stopped, the alkali is used to clean the scab of the dissolving tank 1, and the heating assembly is used to heat the alkali in the dissolving tank 1, so that the cleaning effect is improved.

[0032] The heating assembly comprises a heating sleeve 2 fixedly sleeved on the connecting pipeline 13, a settling tank (not shown in the figure) and a coarse liquid pipe 21, one end of the heating sleeve 2 is fixedly connected with a liquid inlet pipe 22, the other end of the liquid inlet pipe 22 is fixedly connected with one end of the coarse liquid pipe 21 close to the settling tank, the other end of the heating sleeve 2 is fixedly connected with a liquid outlet pipe 23, the other end of the liquid outlet pipe 23 is fixedly connected with one end of the coarse liquid pipe 21 away from the settling tank, a first control valve 3 is installed on the coarse liquid pipe 21 between the liquid outlet pipe 23 and the liquid inlet pipe 22, and third control valves 32 are arranged on the liquid inlet pipe and the liquid outlet pipe 23.

[0033] In the embodiment, the coarse liquid pipe 21 transports the sodium aluminate solution in the settling system, that is, the sodium aluminate solution in the settling tank is used to exchange heat with the lye to heat the lye in the post-leaching tank 1.

[0034] The second control valve 31 is arranged on the branch pipe 14 between the lye pump 12 and the post-leaching tank 1, the fourth control valve 33 is arranged on the connecting pipe 13 at the inlet end and the outlet end of the lye cooking pump 11, and the fifth control valve 34 is arranged on the connecting pipe 13 near the two ends of the heating jacket 2.

[0035] When the lye in the post-leaching tank 1 needs to be heated, the third control valve 32, the fourth control valve 33 and the fifth control valve 34 are opened, the first control valve 3 and the second control valve 31 are closed, and the lye cooking pump 11 is opened. At this time, the lye in the post-leaching tank 1 enters the connecting pipe 13, and then enters the post-leaching tank 1 through the connecting pipe 13. At this time, the heating assembly heats the lye in the connecting pipe 13. At this time, the coarse liquid in the settling tank flows into the liquid inlet pipe 22 through the coarse liquid pipe 21, and then enters the heating jacket 2. The coarse liquid in the heating jacket 2 exchanges heat with the lye in the connecting pipe 13, so as to heat the lye in the post-leaching tank 1. The heated lye enters the post-leaching tank 1 to achieve better scarring effect. The coarse liquid after heat exchange enters the liquid outlet pipe 23, and then enters the coarse liquid pipe 21.

[0036] The blowing pipe 131 is connected to the connecting pipe 13 and the heating jacket 2 to clean the connecting pipe 13 and the heating jacket 2.

[0037] In the embodiment, the post-leaching tank 1 has a specification of Φ12.5*26m and a volume of about 2000m 3 If new steam is used for heating, 3000t of steam will be consumed. In the Bayer process of alumina production, the sodium aluminate solution after settling and filtration needs to be cooled by a plate heat exchanger. If the heating assembly is installed to heat the lye, the consumption of new steam can be completely saved, and the sodium aluminate solution can be cooled in advance, thereby reducing the consumption of water in the subsequent process.

[0038] The implementation principle of the embodiment 1 is as follows:

[0039] When the post-leaching tank 1 needs to be cleaned, the first control valve 3 and the second control valve 31 are opened, the third control valve 32, the fourth control valve 33 and the fifth control valve 34 are closed, and the lye pump 12 is opened. At this time, the lye pump 12 pumps the lye in the lye tank to the post-leaching tank 1. When the lye in the post-leaching tank 1 is sufficient, the lye pump 12 is closed and the second control valve 31 is opened.

[0040] When the lye needs to be heated, the third control valve 32, the fourth control valve 33 and the fifth control valve 34 are opened, the first control valve 3 and the second control valve 31 are closed, and the lye cooking pump 11 is opened. At this time, the lye in the post-leaching tank 1 enters the connecting pipeline 13, and then enters the post-leaching tank 1 through the connecting pipeline 13. At this time, the heating assembly heats the lye in the connecting pipeline 13. At this time, the crude liquid in the settling tank flows into the liquid inlet pipe through the crude liquid pipe 21 and then enters the heating sleeve 2. The crude liquid in the heating sleeve 2 exchanges heat with the lye in the connecting pipeline 13.

[0041] Embodiment 2

[0042] Referring to Figure 2 The difference between this embodiment and embodiment 1 is that a liquid level detection module 4 and a temperature detection module 41 are installed in the post-leaching tank 1. The liquid level detection module 4 is electrically connected with a control module 42. The control module 42 is electrically connected with the temperature detection module 41, the first control valve 3, the second control valve 31, the third control valve 32, the fourth control valve 33, the fifth control valve 34, the lye cooking pump 11 and the lye pump 12.

[0043] The implementation principle of the embodiment 2 of the present application is as follows:

[0044] When the post-leaching tank 1 needs to be cleaned, the first control valve 3 and the second control valve 31 are opened, the third control valve 32, the fourth control valve 33 and the fifth control valve 34 are closed, and the lye pump 12 is opened. At this time, the lye pump 12 extracts the lye in the lye tank into the post-leaching tank 1. The liquid level detection module 4 detects the liquid level data of the lye in the post-leaching tank 1 and sends the liquid level data to the control module 42. The control module 42 compares the liquid level data with the preset data. When the liquid level data is greater than the preset data, the control module 42 controls the lye pump 12 to be closed and the second control valve 31 to be closed.

[0045] The temperature detection module 41 detects the temperature data of the lye in the post-leaching tank 1 in real time and sends the temperature data to the control module 42. The control module 42 compares the temperature data with the preset temperature data. When the temperature data is less than the preset temperature data, the control module 42 controls the second control valve 31 and the first control valve 3 to be closed, controls the third control valve 32, the fourth control valve 33 and the fifth control valve 34 to be opened, and starts the lye cooking pump 11. At this time, the lye in the post-leaching tank 1 enters the connecting pipeline 13, and then enters the post-leaching tank 1 through the connecting pipeline 13. The heating assembly heats the lye in the connecting pipeline 13. At this time, the crude liquid in the settling tank flows into the liquid inlet pipe through the crude liquid pipe 21 and then enters the heating sleeve 2. The crude liquid in the heating sleeve 2 exchanges heat with the lye in the connecting pipeline 13, so as to realize the temperature increase of the lye in the post-leaching tank 1, thereby realizing better descaling effect

[0046] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A post-dissolution silted tank cleaning system characterized by: The device comprises a post-dissolution tank (1), an alkali boiling pump (11), an alkali pump (12), and a connecting pipeline (13), one end of the connecting pipeline (13) is connected with an alkali inlet of the post-dissolution tank (1), the other end of the connecting pipeline (13) is connected with an alkali outlet of the post-dissolution tank (1), the alkali boiling pump (11) is installed on the connecting pipeline (13), a branch pipeline (14) is arranged on the connecting pipeline (13), the branch pipeline (14) is connected with an alkali tank, the alkali pump (12) is arranged on the branch pipeline (14), and a heating assembly for liquid heat exchange of alkali in the post-dissolution tank (1) is arranged on the connecting pipeline (13).

2. A post-dissolution trench scab cleaning system as claimed in claim 1, wherein: The heating assembly comprises a heating sleeve (2) fixedly sleeved on the connecting pipeline (13) and a settling tank.

3. A post-dissolution trench scab cleaning system as defined in claim 2, wherein: The heating assembly further comprises a coarse liquid pipeline (21), one end of the heating sleeve (2) is connected with an inlet pipeline (22), the other end of the heating sleeve (2) is connected with an outlet pipeline (23), the inlet pipeline (22) and the outlet pipeline (23) are connected with the coarse liquid pipeline (21) respectively, the inlet pipeline (22) is connected with an inlet end of the coarse liquid pipeline (21), the outlet pipeline (23) is connected with an outlet end of the coarse liquid pipeline (21), the coarse liquid pipeline (21) is connected with the settling tank, and a first control valve (3) is installed on the coarse liquid pipeline (21) between the inlet pipeline (22) and the outlet pipeline (23).

4. The post-dissolution trench scab cleaning system of claim 3, wherein: A second control valve (31) is installed on the branch pipeline (14) between the alkali pump (12) and the post-dissolution tank (1).

5. The post-dissolution trench scab cleaning system of claim 2, wherein: The connecting pipeline (13) and the heating sleeve (2) are both connected with a blowing pipeline (131).

6. A post-dissolution trench scabbing cleaning system according to claim 3 or 4, wherein: The inlet pipeline (22) and the outlet pipeline (23) are both installed with a third control valve (32).

7. A post-dissolution tank (1) scabbing cleaning system according to claim 6, characterized in that: Fourth control valves (33) are installed on the connecting pipeline (13) at the inlet end and the outlet end of the alkali boiling pump (11).

8. A post-dissolution trench scab cleaning system as defined in claim 7, wherein: Fifth control valves (34) are installed on the connecting pipeline (13) at both ends of the heating sleeve (2).

9. A post-dissolution trench scab cleaning system as defined in claim 8, wherein: A liquid level detection module (4) is installed in the post-dissolution tank (1), the liquid level detection module (4) is electrically connected with a control module (42), the control module (42) is electrically connected with the first control valve (3), the second control valve (31), the third control valve (32), the fourth control valve (33), and the fifth control valve (34) respectively, and the control module (42) is also electrically connected with the alkali boiling pump (11) and the alkali pump (12).

10. A post-dissolution trench scab cleaning system as defined in claim 9, wherein: A temperature detection module (41) is also installed in the post-dissolution tank (1), and the temperature detection module (41) is electrically connected with the control module (42).

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