Primary brine refining on-line maintenance device

Abstract

The utility model relates to the technical field of crude brine refining treatment, in particular to a primary brine refining on-line maintenance device which comprises a front reaction tank, a pretreater, a rear reaction tank and a membrane filter, the front reaction tank is communicated with a crude brine pipeline, and a pretreatment pipeline is communicated between the front reaction tank and the pretreater. A rear reaction pipeline is communicated between the pretreater and the rear reaction tank, the rear reaction tank is communicated with a first sodium carbonate pipeline, a filtering pipeline is communicated between the rear reaction tank and the membrane filter, and the membrane filter is communicated with a refined salt water pipeline. The device is reasonable and compact in structure and convenient to use, the accident rate of crude brine refining treatment equipment is reduced, the equipment maintenance cost is reduced for enterprises, and the device has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of crude brine refining treatment, and is an online maintenance device for primary brine refining. Background Art

[0002] Crude brine contains a large amount of calcium and magnesium ions, as well as organic matter such as bacteria, algae, and humic acid. The main raw material of the electrolysis device of a chemical company is brine. The crude brine must be refined before entering the electrolysis process system. The crude brine enters the pre-reaction tank, where magnesium ions react with sodium hydroxide to form magnesium hydroxide, calcium ions react with sodium carbonate to form calcium carbonate, and organic matter such as bacteria, algae, and humic acid are oxidized and decomposed into small molecular organic matter by sodium hypochlorite. After the crude brine is treated in the pre-reaction tank, the membrane filter filters the magnesium hydroxide, calcium carbonate, and small molecular organic matter in the crude brine to obtain refined brine.

[0003] The following problems exist in the above-mentioned crude brine refining process:

[0004] First, the front reaction tank is made of carbon steel. The humic acid in the crude brine, as well as the sodium hydroxide and sodium hypochlorite added to the raw materials, are highly corrosive to the carbon steel equipment, resulting in a high leakage failure rate in the front reaction tank.

[0005] Second, the membrane filter needs to filter magnesium hydroxide, calcium carbonate, and small molecular organic matter in the crude brine. The filtration workload is large, resulting in a high failure rate of the membrane filter.

[0006] Third, enterprises need to frequently shut down the pre-reaction tank or membrane filter for maintenance. Once the maintenance process begins, the crude brine refining system will be shut down, affecting the normal production of the downstream process system.

[0007] The above crude brine refining process system has a high failure rate and cannot be repaired during online production. The maintenance cost of the enterprise is high, which brings great economic losses to the enterprise. Summary of the invention

[0008] The utility model provides an online maintenance device for primary brine refining, which overcomes the deficiencies of the prior art and can effectively solve the problems of high failure rate and high maintenance cost in the crude brine filtering system of the existing enterprises.

[0009] The technical scheme of the utility model is achieved through the following measures: an online maintenance device for primary brine refining, comprising a front reaction tank, a pretreatment device, a rear reaction tank, and a membrane filter, wherein the first liquid inlet at the top of the front reaction tank is fixedly connected with a crude brine pipeline, the lower liquid outlet of the front reaction tank and the lower liquid inlet of the pretreatment device are fixedly connected with a pretreatment pipeline, the upper liquid outlet of the pretreatment device and the upper liquid inlet of the rear reaction tank are fixedly connected with a rear reaction pipeline, the top of the rear reaction tank is fixedly connected with a first sodium carbonate pipeline, the bottom liquid outlet of the rear reaction tank and the lower liquid inlet of the membrane filter are fixedly connected with a filtration pipeline, the upper liquid outlet of the membrane filter is fixedly connected with a refined brine pipeline, and the second shunt pipeline is fixedly connected between the pretreatment pipeline and the filtration pipeline.

[0010] The following are further optimizations and / or improvements to the above utility model technical solution:

[0011] The front reaction tank and the rear reaction tank are both fixedly provided with electric stirrers.

[0012] The second liquid inlet at the top of the front reaction tank is fixedly connected to a second sodium carbonate pipeline, the third liquid inlet at the top of the front reaction tank is fixedly connected to a sodium hydroxide pipeline, and the fourth liquid inlet at the front reaction tank is fixedly connected to a sodium hypochlorite pipeline.

[0013] The bottom outlet of the pre-processor is fixedly connected to a first precipitation discharge pipeline.

[0014] The bottom outlet of the membrane filter is fixedly connected to a second precipitation discharge pipeline.

[0015] The first shunt pipeline is fixedly connected between the pretreatment pipeline and the post-reaction pipeline between the lower liquid outlet of the front reaction tank and the second shunt pipeline.

[0016] A circulation pump is fixedly installed on the pretreatment pipeline between the lower liquid outlet of the front reaction tank and the first diversion pipeline.

[0017] The crude brine pipeline is fixedly installed with a first solenoid valve, the second sodium carbonate pipeline is fixedly installed with a second solenoid valve, the sodium hydroxide pipeline is fixedly installed with a third solenoid valve, and the sodium hypochlorite pipeline is fixedly installed with a fourth solenoid valve.

[0018] A fifth solenoid valve is fixedly installed on the pretreatment pipeline between the second shunt pipeline and the lower liquid inlet of the pretreatment device, a sixth solenoid valve is fixedly installed on the first shunt pipeline, and a seventh solenoid valve is fixedly installed on the second shunt pipeline.

[0019] The device also includes a controller, and the electric stirrer, the circulation pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, and the seventh solenoid valve are all electrically connected to the solenoid valve.

[0020] The utility model has a reasonable and compact structure and is easy to use. It reduces the production load of the front reaction tank and the membrane filter and can realize online equipment maintenance, thereby reducing equipment maintenance costs. It has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0022] Attached Figure 1 The codes are as follows: 1 is the front reaction tank, 2 is the pretreatment device, 3 is the rear reaction tank, 4 is the membrane filter, 5 is the crude brine pipeline, 6 is the pretreatment pipeline, 7 is the rear reaction pipeline, 8 is the filtration pipeline, 9 is the refined brine pipeline, 10 is the electric stirrer, 11 is the first sodium carbonate pipeline, 12 is the sodium hydroxide pipeline, 13 is the sodium hypochlorite pipeline, 14 is the first precipitation discharge pipeline, 15 is the second precipitation discharge pipeline, 16 is the first diversion pipeline, 17 is the second diversion pipeline, 18 is the circulation pump, 19 is the first solenoid valve, 20 is the second solenoid valve, 21 is the third solenoid valve, 22 is the fourth solenoid valve, 23 is the fifth solenoid valve, 24 is the sixth solenoid valve, 25 is the seventh solenoid valve, and 26 is the second sodium carbonate pipeline. DETAILED DESCRIPTION

[0023] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0024] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0025] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0026] The present invention is further described below in conjunction with the embodiments and drawings:

[0027] Embodiment 1: As attached Figure 1As shown, the online maintenance device for primary brine refining includes a front reaction tank 1, a pretreatment device 2, a rear reaction tank 3, and a membrane filter 4. The first liquid inlet at the top of the front reaction tank 1 is fixedly connected with a crude brine pipeline 5, a pretreatment pipeline 6 is fixedly connected between the lower liquid outlet of the front reaction tank 1 and the lower liquid inlet of the pretreatment device 2, a rear reaction pipeline 7 is fixedly connected between the upper liquid outlet of the pretreatment device 2 and the upper liquid inlet of the rear reaction tank 3, a first sodium carbonate pipeline 11 is fixedly connected to the top of the rear reaction tank 3, a filtration pipeline 8 is fixedly connected between the bottom liquid outlet of the rear reaction tank 3 and the lower liquid inlet of the membrane filter 4, a refined brine pipeline 9 is fixedly connected to the upper liquid outlet of the membrane filter 4, and a second shunt pipeline 17 is fixedly connected between the pretreatment pipeline 6 and the filtration pipeline 8.

[0028] According to the needs, during the production and operation of the device, the front pre-processor 2 and the rear reaction tank 3 are provided to reduce the workload of the crude brine refining treatment of the front reaction tank 1 and the membrane filter 4, thereby reducing the failure rate of the front reaction tank 1 and the membrane filter 4. On the other hand, without affecting the crude brine refining treatment of the front reaction tank 1 and the membrane filter 4, the pre-processor 2 and the rear reaction tank 3 can be shut down at any time to carry out equipment maintenance on the pre-processor 2 and the rear reaction tank 3.

[0029] The above-mentioned primary brine refining online maintenance device can be further optimized and / or improved according to actual needs:

[0030] Embodiment 2: It is different from Embodiment 1 in that: Figure 1 As shown, electric stirrers 10 are fixedly installed in the front reaction tank 1 and the rear reaction tank 3 .

[0031] Embodiment 3: It differs from Embodiment 1 to Embodiment 2 in that: Figure 1 As shown, the second liquid inlet at the top of the front reaction tank 1 is fixedly connected to the second sodium carbonate pipeline 26, the third liquid inlet at the top of the front reaction tank 1 is fixedly connected to the sodium hydroxide pipeline 12, and the fourth liquid inlet at the top of the front reaction tank 1 is fixedly connected to the sodium hypochlorite pipeline 13.

[0032] Embodiment 4: It differs from Embodiments 1 to 3 in that: Figure 1 As shown, the bottom outlet of the pre-processor 2 is fixedly connected to a first precipitation discharge pipeline 14 .

[0033] Embodiment 5: It differs from Embodiments 1 to 4 in that: Figure 1 As shown, the bottom outlet of the membrane filter 4 is fixedly connected to a second precipitation discharge pipeline 15 .

[0034] Embodiment 6: It differs from Embodiments 1 to 5 in that: Figure 1As shown, a first diversion pipeline 16 is fixedly connected between the pretreatment pipeline 6 and the post-reaction pipeline 7 between the lower liquid outlet of the front reaction tank 1 and the second diversion pipeline 17 .

[0035] Embodiment 7: It differs from Embodiments 1 to 6 in that: Figure 1 As shown, a circulation pump 18 is fixedly installed on the pretreatment pipeline 6 between the lower liquid outlet of the front reaction tank 1 and the first branch pipeline 16.

[0036] Embodiment 8: It differs from Embodiments 1 to 7 in that: Figure 1 As shown, a first solenoid valve 19 is fixedly installed on the crude brine pipeline 5 , a second solenoid valve 20 is fixedly installed on the second sodium carbonate pipeline 26 , a third solenoid valve 21 is fixedly installed on the sodium hydroxide pipeline 12 , and a fourth solenoid valve 22 is fixedly installed on the sodium hypochlorite pipeline 13 .

[0037] Embodiment 9: It differs from Embodiments 1 to 8 in that: Figure 1 As shown, a fifth solenoid valve 23 is fixedly installed on the pretreatment pipeline 6 between the second shunt pipeline 17 and the lower liquid inlet of the pretreatment device 2, a sixth solenoid valve 24 is fixedly installed on the first shunt pipeline 16, and a seventh solenoid valve 25 is fixedly installed on the second shunt pipeline 17.

[0038] Embodiment 10: It differs from Embodiments 1 to 9 in that: Figure 1 As shown, the device also includes a controller, and the electric stirrer 10, the circulating pump 18, the first solenoid valve 19, the second solenoid valve 20, the third solenoid valve 21, the fourth solenoid valve 22, the fifth solenoid valve 23, the sixth solenoid valve 24, and the seventh solenoid valve 25 are all electrically connected to the solenoid valves.

[0039] According to the needs, the pipelines and equipment of the primary brine refining online maintenance device can also be equipped with conventional valves, thermometers and pressure gauges known in the art according to production needs. The controller is a DCS controller, and the model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0040] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0041] The use process of the embodiment of the utility model is as follows: first, the crude brine enters the front reactor 1 through the crude brine pipeline 5, and then sodium hydroxide solution, sodium carbonate solution and sodium hypochlorite solution are added to the front reactor 1, the magnesium ions in the crude brine react with sodium hydroxide to generate magnesium hydroxide, the calcium ions react with sodium carbonate to generate calcium carbonate, and organic matter such as bacteria, algae and humic acid are oxidized and decomposed into small molecular organic matter by sodium hypochlorite; then, the crude brine treated by the front reactor 1 enters the pretreatment device 2 through the pretreatment pipeline 6 to remove magnesium hydroxide and small molecular organic matter in the crude brine; then, the crude brine treated by the pretreatment device 2 enters the post-reaction tank 3 through the post-reaction pipeline 7, and sodium carbonate solution is added to the post-reaction tank 3 to remove the remaining calcium ions in the crude brine again; finally, the crude brine treated by the post-reaction tank 3 enters the membrane filter 4 through the filtration pipeline 8 for fine filtration to obtain a primary refined brine, which enters the downstream process system through the refined brine pipeline 9.

[0042] As needed, when the pretreatment device 2 fails, the crude brine treated by the front reaction tank 1 can enter the rear reaction tank 3 through the pretreatment pipeline 6, the first diversion pipeline 16, and the rear reaction pipeline 7 in sequence, and the crude brine treated by the rear reaction tank 3 enters the membrane filter 4 through the filtration pipeline 8 for fine filtration; on the other hand, when the rear reaction tank 3 fails, the crude brine treated by the front reaction tank 1 can enter the membrane filter 4 through the pretreatment pipeline 6, the second diversion pipeline 17, and the filtration pipeline 8 in sequence for fine filtration.

Claims

1. A primary brine refining online maintenance device, characterized in that The invention comprises a front reaction tank, a pretreatment device, a rear reaction tank and a membrane filter. The first liquid inlet at the top of the front reaction tank is fixedly connected with a coarse brine pipeline, the lower liquid outlet of the front reaction tank and the lower liquid inlet of the pretreatment device are fixedly connected with a pretreatment pipeline, the upper liquid outlet of the pretreatment device and the upper liquid inlet of the rear reaction tank are fixedly connected with a rear reaction pipeline, the top of the rear reaction tank is fixedly connected with a first sodium carbonate pipeline, the bottom liquid outlet of the rear reaction tank and the lower liquid inlet of the membrane filter are fixedly connected with a filtration pipeline, the upper liquid outlet of the membrane filter is fixedly connected with a refined brine pipeline, and the second shunt pipeline is fixedly connected between the pretreatment pipeline and the filtration pipeline.

2. The on-line maintenance device for primary brine refining according to claim 1 is characterized in that Electric stirrers are fixedly arranged in the front reaction tank and the rear reaction tank.

3. The on-line maintenance device for primary brine refining according to claim 1 or 2, characterized in that The second liquid inlet at the top of the front reaction tank is fixedly connected with a second sodium carbonate pipeline, the third liquid inlet at the top of the front reaction tank is fixedly connected with a sodium hydroxide pipeline, and the fourth liquid inlet at the front reaction tank is fixedly connected with a sodium hypochlorite pipeline.

4. The on-line maintenance device for primary brine refining according to claim 3 is characterized in that The bottom outlet of the pre-processor is fixedly connected to a first precipitation discharge pipeline.

5. The on-line maintenance device for primary brine refining according to claim 1, 2 or 4, characterized in that The bottom outlet of the membrane filter is fixedly connected with a second precipitation discharge pipeline.

6. The on-line maintenance device for primary brine refining according to claim 5 is characterized in that A first shunt pipeline is fixedly connected between the pretreatment pipeline and the post-reaction pipeline between the lower liquid outlet of the front reaction tank and the second shunt pipeline.

7. The on-line maintenance device for primary brine refining according to claim 6 is characterized in that A circulation pump is fixedly installed on the pretreatment pipeline between the lower liquid outlet of the front reaction tank and the first diversion pipeline.

8. The on-line maintenance device for primary brine refining according to claim 4, 6 or 7, characterized in that A first solenoid valve is fixedly installed on the crude brine pipeline, a second solenoid valve is fixedly installed on the second sodium carbonate pipeline, a third solenoid valve is fixedly installed on the sodium hydroxide pipeline, and a fourth solenoid valve is fixedly installed on the sodium hypochlorite pipeline.

9. The on-line maintenance device for primary brine refining according to claim 8 is characterized in that A fifth solenoid valve is fixedly installed on the pretreatment pipeline between the second shunt pipeline and the lower liquid inlet of the pretreatment device, a sixth solenoid valve is fixedly installed on the first shunt pipeline, and a seventh solenoid valve is fixedly installed on the second shunt pipeline.

10. The on-line maintenance device for primary brine refining according to claim 9, characterized in that It also includes a controller, an electric stirrer, a circulation pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, and a seventh solenoid valve, all of which are electrically connected to the solenoid valve.

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