Automatic accumulated nitrate cleaning device for nitrate settling device

Abstract

The utility model discloses a saltpeter accumulated saltpeter automatic cleaning device which comprises a saltpeter, a flushing part is arranged in the saltpeter, the flushing part comprises a hot water conveying pipe with a plurality of through holes in the side face, the outer portion of the hot water conveying pipe is communicated with a rotating pipe in a rotating mode, a plurality of water outlets are formed in the rotating pipe, and the water outlets are communicated with the hot water conveying pipe. A first liquid outlet of the saltpeter is communicated with a circulating pump, the circulating pump is communicated with a heat exchanger, and a refrigerant outlet of the heat exchanger is connected to the saltpeter. The device can effectively eliminate the problem of aggregation and crystallization of mirabilite at the conical bottom of the mirabilite precipitation device, reduce or eliminate the frequency of shutdown hot washing, and provide production stability and continuity.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium sulfate decahydrate production, in particular to an automatic cleaning device for accumulated saltpeter in a saltpeter precipitator in the process of sodium sulfate decahydrate production. Background Art

[0002] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and shall not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field.

[0003] The cooling crystallization separation method is a common production process for sodium sulfate decahydrate. In this production process, the sodium sulfate solution concentrated by nanofiltration is cooled by the first and second stages before entering the precipitator. After further circulating cooling in the precipitator, sodium sulfate decahydrate crystals are precipitated after reaching 0-8°C, and then introduced into the cyclone to produce the finished sodium sulfate decahydrate packaged for sale.

[0004] It is found in the prior art that during operation, Glauber's salt is easily deposited at the bottom of the cone of the saltpeter settling device, causing the central tube to be blocked and overflowing, requiring the device to be stopped for hot washing, which is performed about once every 10 days. The current common hot washing method is to connect the flushing pipe directly to the bottom of the central tube of the saltpeter settling device and use hot water to flush the sediment. During operation, crystals are easily attached to the wall outside the flushing pipe, affecting the hot washing effect, and further affecting the product output and quality. In addition, the aqueous solution after flushing is directly discharged to the wastewater treatment station, which is wasteful. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides an automatic cleaning device for accumulated saltpeter in a saltpeter settling device, which can effectively eliminate the problem of aggregation and crystallization of Glauber's salt at the bottom of the cone of the saltpeter settling device, reduce or eliminate the frequency of stopping for hot washing, and provide production stability and continuity.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An automatic cleaning device for accumulated saltpeter in a saltpeter precipitator comprises a saltpeter precipitator, wherein a flushing component is arranged inside the saltpeter precipitator, wherein the flushing component comprises a hot water delivery pipe with a plurality of through holes on the side, wherein the hot water delivery pipe is rotatably connected to a rotating pipe on the outside, wherein a plurality of water outlets are arranged on the rotating pipe, wherein a first liquid outlet of the saltpeter precipitator is connected to a circulating pump, wherein the circulating pump is connected to a heat exchanger, and wherein a refrigerant outlet of the heat exchanger is connected back to the saltpeter precipitator.

[0008] Preferably, the side wall of the rotating tube is connected to a spray rod at each water outlet, and the end of the spray rod is connected to a spray head.

[0009] Preferably, the spray bar is an L-shaped structure.

[0010] Preferably, the diameter of the nozzle close to the spray rod end is larger than the diameter away from the spray rod end.

[0011] Preferably, a central tube is provided in the saltpeter precipitator, and the hot water delivery pipe and the rotating tube are both located in the central tube.

[0012] Preferably, the second liquid outlet of the saltpeter precipitator is connected to a discharge pump, the discharge pump is connected to a cyclone, and the liquid outlet of the cyclone is connected back to the saltpeter precipitator.

[0013] Preferably, a sodium sulfate solution feed port, a hot water feed port, a cleaning liquid feed port and a recovery liquid feed port are provided at the upper end of the saltpetre precipitator, the cleaning liquid feed port is connected to the heat exchanger, and the recovery liquid feed port is connected to the cyclone.

[0014] Preferably, the sodium sulfate solution feed port, hot water feed port, cleaning liquid feed port and recovery liquid feed port are all connected to the central tube, and the first liquid outlet and the second liquid outlet are connected to the outer shell of the salt precipitator.

[0015] Preferably, there are three water outlets, which are evenly distributed along the circumference of the rotating tube. The utility model has the following beneficial effects:

[0016] 1. The utility model provides a hot water delivery pipe and a rotating pipe, and the spray rod is driven by the reaction force to rotate and flush, so that a uniform, rapid and dead-angle-free effect can be achieved during the flushing process; blockage is avoided and the flushing effect is improved.

[0017] 2. The circulating pump and cooler are set up so that the sodium sulfate solution produced during the flushing process is not discharged, but follows the cooling circulation pump to continue to participate in cooling and concentration, thereby avoiding waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is the overall structure diagram of the utility model;

[0020] Figure 2 It is a top view of the structure of the flushing component;

[0021] Figure 3 It is a cross-sectional structural diagram of the flushing component;

[0022] In the figure, 1. saltpeter precipitator, 2. center tube, 3. circulation pump, 4. heat exchanger, 5. discharge pump, 6. cyclone, 7. discharge valve, 8. spray rod, 9. rotating pipe, 10. spray head, 11. hot water delivery pipe. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] like Figure 1-3 As shown, the utility model provides an automatic cleaning device for accumulated saltpeter in a saltpeter precipitator, the device comprising:

[0026] The salt precipitator 1, the main structure of which includes a central cylinder and a flushing component;

[0027] The material inlet of the central cylinder 2 is introduced with the pre-cooled sodium sulfate solution;

[0028] A circulating pump 3 for cooling, the inlet of which is connected to the outlet of the cleaning liquid of the precipitator;

[0029] The heat exchanger 4 is a cryogenic heat exchanger, the inlet of which is connected to the outlet of the circulation pump 3, and the outlet of which is connected to the inlet of the central tube 2;

[0030] A discharge pump 5, the inlet of which is connected to the outlet of the saltpeter 1;

[0031] The inlet of the cyclone 6 is connected to the outlet of the discharge pump 5, and the outlet produces the finished product of sodium sulfate decahydrate.

[0032] The flushing component has a hot water delivery pipe 11 at its center. The outside of the hot water delivery pipe is rotatably connected to a rotating pipe 9 via a bearing. A plurality of through holes are arranged on the side wall of the hot water pipe, through which hot water flows into the rotating pipe. The upper and lower parts of the rotating pipe are both closed. Three water outlets are evenly distributed on the side wall of the rotating pipe in the circumferential direction. Each water outlet is connected to an L-shaped spray rod 8. A nozzle 10 with a gradually decreasing diameter is installed at the end of the spray rod.

[0033] When sodium sulfate decahydrate crystal particles gather inside the salt precipitator 1 and the cone and the center tube are blocked, the water inlet valve of the flushing component pipeline is opened, hot water enters the spray rod 8, and the nozzle 10 produces a blooming water flow. After the water is sprayed onto the arm of the center tube, a reaction force is generated on the spray rod 8 and the rotating tube 9. Under the push of the reaction force, the rotating tube rotates along the hot water pipe, and the water outlet rotates accordingly, so that the center tube and the cone can be hot-washed at all angles.

[0034] The sodium sulfate solution generated during the flushing process is not discharged, but continues to participate in cooling and concentration after circulating through the circulating pump 3 and the heat exchanger 4 to avoid waste of raw materials.

[0035] The working process of the device is as follows:

[0036] The pre-cooled sodium sulfate solution enters the central tube 2 in the precipitator 1, is pumped by the circulating pump 3, enters the cryogenic heat exchanger 4, is cooled by the refrigerant, and then enters the central tube 2;

[0037] When the sodium sulfate solution reaches 0-8°C under the circulation and cooling effect of the circulation pump 3, most of the sodium sulfate is crystallized and precipitated. The sodium sulfate decahydrate crystal particles in the central tube 2 gradually grow and sink under the action of gravity, and finally accumulate at the bottom of the cone of the salt settler 1.

[0038] The discharge pump 5 extracts the sodium sulfate decahydrate crystal particles and the diluted liquid at the bottom of the precipitator and sends them to the cyclone 6. After centrifugal separation, the diluted liquid returns to the central tube 2 to continue to participate in cooling and crystallization; the sodium sulfate decahydrate crystal particles are packaged and sold;

[0039] When sodium sulfate decahydrate crystal particles gather inside the salt setter 1 and the cone section and the center tube 2 are blocked during production, the water inlet valve of the flushing component pipeline is opened, hot water enters the spray rod 8, and the spray head 10 produces a blooming water flow. Driven by the reaction force, the cone section and the center tube 2 of the salt setter 1 are hot-washed at all angles;

[0040] During the flushing process, the raw material liquid is suspended from entering the central cylinder 2; the flushing liquid generated during the flushing process contains sodium sulfate, which is extracted by the circulating pump 3 and enters the heat exchanger 4. After being cooled by the refrigerant, it enters the central cylinder 2; after the flushing is completed, the raw material liquid enters the central cylinder 2;

[0041] The flushing liquid and the raw material liquid are cooled and crystallized by the circulating pump 3, and then enter the cyclone 6 through the discharging pump 5. The diluted liquid returns to the central cylinder 2 to continue to participate in cooling and crystallization, and the sodium sulfate decahydrate crystal particles are produced and packaged for sale;

[0042] Repeating the above steps will avoid periodic shutdown and maintenance, and can obtain continuous output of sodium sulfate decahydrate crystalline particles.

[0043] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An automatic cleaning device for saltpeter accumulation in a saltpeter precipitator, characterized in that: The invention comprises a saltpeter precipitator (1), wherein a flushing component is arranged inside the saltpeter precipitator, wherein the flushing component comprises a hot water delivery pipe (11) with a plurality of through holes on the side, wherein the hot water delivery pipe is externally connected to a rotating pipe (9) for rotation, wherein a plurality of water outlets are arranged on the rotating pipe, wherein a first liquid outlet of the saltpeter precipitator is connected to a circulating pump (3), wherein the circulating pump is connected to a heat exchanger (4), and wherein a refrigerant outlet of the heat exchanger is connected back to the saltpeter precipitator (1).

2. The automatic cleaning device for saltpeter accumulation in a saltpeter precipitator according to claim 1, characterized in that: The side wall of the rotating pipe (9) is connected to a spray bar (8) at each water outlet, and the end of the spray bar is connected to a spray head (10).

3. The automatic cleaning device for accumulated saltpeter in a saltpeter precipitator according to claim 2, characterized in that: The spray bar is an L-shaped structure.

4. The automatic cleaning device for saltpeter accumulation in a saltpeter precipitator according to claim 2, characterized in that: The diameter of the nozzle (10) close to the spray rod end is larger than the diameter of the nozzle (10) far from the spray rod end.

5. The automatic cleaning device for accumulated saltpeter in a saltpeter precipitator according to claim 2, characterized in that: A central tube (2) is provided in the salt precipitator, and the hot water delivery pipe (11) and the rotating tube (9) are both located in the central tube.

6. The automatic cleaning device for accumulated saltpeter in a saltpeter precipitator according to claim 5, characterized in that: The second liquid outlet of the salt precipitator is connected to a discharge pump (5), the discharge pump is connected to a cyclone (6), and the liquid outlet of the cyclone is connected back to the salt precipitator (1).

7. The automatic cleaning device for saltpeter accumulation in a saltpeter precipitator according to claim 6, characterized in that: The upper end of the salt precipitator is provided with a sodium sulfate solution feed port, a hot water feed port, a cleaning liquid feed port and a recovery liquid feed port, the cleaning liquid feed port is connected to the heat exchanger (4), and the recovery liquid feed port is connected to the cyclone (6).

8. The automatic cleaning device for accumulated saltpeter in a saltpeter precipitator according to claim 7, characterized in that: The sodium sulfate solution feed port, hot water feed port, cleaning liquid feed port and recovery liquid feed port are all connected to the central tube (2), and the first liquid outlet and the second liquid outlet are connected to the outer shell of the salt precipitator.

9. The automatic cleaning device for saltpeter accumulation in a saltpeter precipitator according to claim 1, characterized in that: There are three water outlets, which are evenly distributed along the circumference of the rotating tube.

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