Interlocking type solid-liquid separation device

Abstract

The utility model belongs to the technical field of methylhydrazine production, and particularly relates to an interlocking type solid-liquid separation device which comprises a centrifugal machine and a crystallization kettle, the output end A of the centrifugal machine is communicated with a solid collection bag, and the output end B of the centrifugal machine is communicated with a liquid outlet pipe and is communicated with a mother liquid collection tank through the liquid outlet pipe. A liquid outlet valve, a flow meter and a liquid outlet pump are sequentially connected to the liquid outlet pipe from front to back, the flow meter is connected with an adjusting valve in an interlocking manner, and the adjusting valve is connected to a discharging pipe communicated between the crystallization kettle and the centrifugal machine. According to the utility model, the water content of the sodium chloride solid is effectively controlled and can be controlled below 5%, so that the solid waste treatment cost is greatly reduced, meanwhile, the solid-liquid separation device has an automatic control function, the complexity and error of manual operation are reduced, the treatment capacity is improved, and the solid-liquid separation device is suitable for large-batch production.

Description

Technical Field

[0001] The utility model belongs to the technical field of producing methylhydrazine, and specifically relates to an interlocking solid-liquid separation device. Background Art

[0002] During the production process of methylhydrazine, highly toxic hydrazine hydrate waste liquid is produced. Hydrazine hydrate waste liquid is easily oxidized when exposed to air and there is a risk of combustion and explosion. In order to avoid the discharge of hydrazine hydrate waste liquid and polluting the environment, it is recycled and applied. Since hydrazine hydrate waste liquid contains a large amount of sodium chloride, it is necessary to convert sodium chloride into solid and separate it before recycling hydrazine hydrate. The traditional separation of hydrazine hydrate waste liquid and sodium chloride solid is to carry out solid waste treatment by manually digging waste salt. This method not only affects the quality of hydrazine hydrate recovery, but also endangers the health of workers. In order to improve the safety of solid waste treatment, solid-liquid separation has been achieved through screws, filter tanks and discharge ports. Although it can ensure the health of workers, it is still difficult to balance the recovery of hydrazine hydrate and the solid waste treatment of sodium chloride solids, and the quality of recovered hydrazine hydrate is also difficult to control.

[0003] In the prior art, there are studies on the problem that it is difficult to balance the recovery of hydrazine hydrate and the solid waste treatment of sodium chloride solid, and it is difficult to control the quality of hydrazine hydrate, such as patent application CN117443314A-a solid-liquid separation device and a hydrazine hydrate recovery method, which utilizes a through-type rotating arrangement of a storage barrel and a rotating shaft to achieve the purpose of rapidly discharging solid waste and recovering hydrazine hydrate to make it into a mother liquor for continued use, solving the problem that it is difficult to balance the recovery of hydrazine hydrate and the solid waste treatment of sodium chloride solid, and it is difficult to control the quality of hydrazine hydrate. However, the existing solid-liquid separation device can only ensure the continuity of solid-liquid separation, but it is difficult to effectively control the water content of sodium chloride solid, making it difficult to effectively reduce the cost of solid waste disposal. For this reason, a new technical solution is needed to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide an interlocking solid-liquid separation device to solve the problems raised in the above background technology that the current solid-liquid separation device is difficult to effectively control the water content of sodium chloride solid, making it difficult to effectively reduce the cost of solid waste disposal.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an interlocking solid-liquid separation device, comprising a centrifuge and a crystallization kettle connected to the input end of the centrifuge, the crystallization kettle is equipped with a stirring device, the stirring mechanism of the stirring device extends from the outer top of the crystallization kettle to the inside of the crystallization kettle and rotates inside the crystallization kettle, the output A end of the centrifuge is connected to a solid collection bag, the output B end of the centrifuge is connected to a liquid outlet pipe and is connected to a mother liquor collection tank through the liquid outlet pipe, the liquid outlet pipe is connected to a liquid outlet valve, a flow meter and a liquid outlet pump in sequence from front to back, the output end of the liquid outlet pump is connected to a check valve and a pressure gauge in sequence from front to back, the flow meter is interlocked with a regulating valve, and the regulating valve is connected to a discharge pipe connected between the crystallization kettle and the centrifuge.

[0006] Furthermore, one end of the liquid outlet pipe is connected to the output B end of the centrifuge, and the other end of the liquid outlet pipe is connected to the input end of the mother liquid collecting tank, and the mother liquid collecting tank is connected to an emptying pipe.

[0007] Furthermore, one end of the discharge pipe is connected to the output end of the crystallization kettle, and the other end of the discharge pipe is connected with a discharge valve, a regulating valve and an observation mirror in sequence from front to back and is divided into two paths through the discharge valve and the regulating valve: one path is connected with a feed pipe and is connected with the input end of the centrifuge through the feed pipe, and the other path is connected with a reflux pipe and is connected with the reflux end of the crystallization kettle through the reflux pipe; one end of the feed pipe is connected with the other end of the discharge pipe, and the other end of the feed pipe is connected to the input end of the centrifuge; one end of the reflux pipe is connected with the other end of the discharge pipe, and the other end of the reflux pipe is connected to a reflux pump and is connected to the reflux end of the crystallization kettle through the reflux pump.

[0008] Furthermore, the discharge pipe is also connected to an emergency pipe, which is connected to an emergency valve and is connected to the feed pipe and the return pipe through the emergency valve. The connection between one end of the emergency pipe and the discharge pipe is arranged at the front end of the regulating valve, and the connection between the other end of the emergency pipe and the discharge pipe is arranged at the rear end of the regulating valve.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. The utility model utilizes the rapid cooling effect of the crystallization kettle to enable the sodium chloride mixed in the hydrazine hydrate waste liquid to be rapidly concentrated and crystallized under the effect of the rapid low temperature, so that the water content of the sodium chloride solid separated by the centrifuge is effectively controlled, and its water content can be controlled below 5%, which effectively improves the dryness of the sodium chloride solid and greatly reduces the cost of solid waste disposal. The interlocking setting of the flow meter and the regulating valve is adopted to make the flow of the hydrazine hydrate liquid separated by the centrifuge within a controllable range, so that the solid-liquid separation device has the function of automatic control, effectively reduces the tediousness and error of manual operation, effectively improves the effect and efficiency of solid-liquid separation, and also effectively improves the processing capacity of the solid-liquid separation device, which is suitable for mass production;

[0011] 2. The utility model provides a reflux pipe connected to the discharge pipe, so that the hydrazine hydrate solution discharged from the crystallization kettle can flow back into the crystallization kettle, which effectively improves the discharge speed in the crystallization kettle, and also effectively avoids the problem of crystallized sodium chloride deposition and clogging the pipeline due to slow discharge speed, thereby ensuring the treatment effect and efficiency of the solid-liquid separation device;

[0012] 3. The utility model arranges an emergency pipe connected to the discharge pipe, so that the solid-liquid separation device can always be in a normal working state when a regulating valve fails, effectively avoiding the problem of failure to work normally due to a regulating valve failure, thereby ensuring the working effect and efficiency of the solid-liquid separation device, greatly improving the processing volume, and being suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the structure of the middle crystallization kettle in a reflux state;

[0015] Figure 3 for Figure 1 A schematic diagram of the structure of the centrifuge in the state of separating solid sodium chloride;

[0016] Figure 4 for Figure 1 Schematic diagram of the structure of the centrifuge in the state of separating hydrazine hydrate solution.

[0017] Among them: 1. Centrifuge; 2. Crystallization kettle; 3. Discharge pipe; 4. Discharge valve; 5. Regulating valve; 6. Observation mirror; 7. Reflux pipe; 8. Reflux pump; 9. Stirring device; 10. Solid collection bag; 11. Liquid outlet pipe; 12. Mother liquor collection tank; 13. Emptying pipe; 14. Liquid outlet valve; 15. Flow meter; 16. Liquid outlet pump; 17. Check valve; 18. Pressure gauge; 19. Emergency pipe; 20. Emergency valve; 21. Feed pipe. DETAILED DESCRIPTION

[0018] The following examples are used to further illustrate the content of the utility model, but do not limit the application of the utility model.

[0019] See also Figure 1-Figure 4 , an interlocking solid-liquid separation device, comprising a centrifuge 1 for solid-liquid separation and a crystallization kettle 2 for controlling the water content of separated sodium chloride solids, the output end of the crystallization kettle 2 is connected with a discharge pipe 3, the discharge pipe 3 is connected with a discharge valve 4 for discharging, a regulating valve 5 for adjusting the flow rate and an observation mirror 6 for observing the flow rate from front to back, and is divided into two paths through the discharge valve 4 and the regulating valve 5: one path is connected with a feed pipe 21 for conveying a hydrazine hydrate solution after crystallization and is connected with the input end of the centrifuge 1 through the feed pipe 21, one end of the feed pipe 21 is connected with the other end of the discharge pipe 3, and the other end of the feed pipe 21 is connected to the input end of the centrifuge 1; the other path is connected with a reflux pipe 7 for conveying the hydrazine hydrate solution after crystallization and is connected with the reflux end of the crystallization kettle 2 through the reflux pipe 7, one end of the reflux pipe 7 is connected with the other end of the discharge pipe 3, the other end of the reflux pipe 7 is connected with a reflux pump 8 and is connected to the reflux end of the crystallization kettle 2 through the reflux pump 8;

[0020] A stirring device 9 for stirring is installed on the crystallization kettle 2, and the stirring mechanism of the stirring device 9 extends from the outer top of the crystallization kettle 2 to the inside of the crystallization kettle 2 and rotates inside the crystallization kettle 2;

[0021] The output A end of the centrifuge 1 is connected to a solid collection bag 10 for collecting sodium chloride solids, and the output B end of the centrifuge 1 is connected to a liquid outlet pipe 11 for outputting the separated hydrazine hydrate liquid, and is connected to a mother liquid collection tank 12 for collecting the separated hydrazine hydrate liquid through the liquid outlet pipe 11, wherein one end of the liquid outlet pipe 11 is connected to the output B end of the centrifuge 1, and the other end of the liquid outlet pipe 11 is connected to the input end of the mother liquid collection tank 12, and the mother liquid collection tank 12 is connected to an exhaust pipe 13 for discharging gas in the mother liquid collection tank 12;

[0022] The liquid outlet pipe 11 is connected with a liquid outlet valve 14, a flow meter 15 and a liquid outlet pump 16 in sequence from front to back, and the output end of the liquid outlet pump 16 is connected with a check valve 17 and a pressure gauge 18 in sequence from front to back, and the flow meter 15 is interlocked with the regulating valve 5, and the regulating valve 5 is connected to the discharge pipe 3 connected between the crystallization kettle 2 and the centrifuge 1;

[0023] The discharge pipe 3 is also connected to an emergency pipe 19 for preventing the regulating valve 5 from failing to operate normally. The emergency pipe 19 is connected to an emergency valve 20 and is connected to the feed pipe 21 and the return pipe 7 through the emergency valve 20.

[0024] The connection between one end of the emergency pipe 19 and the discharge pipe 3 is arranged at the front end of the regulating valve 5 , and the connection between the other end of the emergency pipe 19 and the discharge pipe 3 is arranged at the rear end of the regulating valve 5 .

[0025] The working principle and use process of this embodiment are as follows: Figure 1-Figure 4 It is shown that after the interlocking solid-liquid separation device is assembled, the operator installs the interlocking solid-liquid separation device as a whole in the methylhydrazine production equipment (the functions and structures of conventional equipment such as methylhydrazine production equipment are well known in the art, and the connection settings are also common knowledge, so no further explanation is given here, and it is not shown in the accompanying drawings). The crystallization kettle 2 is used to rapidly cool down the sodium chloride mixed in the hydrazine hydrate solution under the action of rapid low temperature, so that the water content of the sodium chloride solid separated by the centrifuge 1 is effectively controlled, and its water content can be controlled below 5%, which effectively improves the dryness of the sodium chloride solid and greatly reduces the cost of solid waste disposal. At the same time, the flow interlocking principle is used to make the flow of the hydrazine hydrate liquid separated by the centrifuge 1 within a controllable range, so that the solid-liquid separation device has the function of automatic control, effectively reduces the cumbersomeness and error of manual operation, effectively improves the effect and efficiency of solid-liquid separation, and also effectively improves the processing capacity of the solid-liquid separation device, which is suitable for mass production;

[0026] When the hydrazine hydrate waste liquid needs to be treated with solid and liquid, the operator discharges the hydrazine hydrate waste liquid generated in the methylhydrazine production equipment into the crystallization kettle 2 through the input end of the crystallization kettle 2. Under the effect of the rapid cooling of the crystallization kettle 2, the sodium chloride mixed in the hydrazine hydrate waste liquid will quickly concentrate and crystallize, and then open the discharge valve 4 and the regulating valve 5. At this time, the crystallized hydrazine hydrate solution (the hydrazine hydrate solution includes a mixture of sodium chloride, hydrazine hydrate and water) is discharged through the discharge pipe 3, and the discharged hydrazine hydrate solution is divided into two paths: one path is a small part of the hydrazine hydrate solution will be re-injected into the crystallization kettle 2 through the reflux pipe 7 through the reflux pump 8 (such as Figure 2As shown), the problem of crystallized sodium chloride deposition blocking the pipeline due to slow discharge speed is solved; the other way is that most of the hydrazine hydrate solution will be transported to the centrifuge 1 through the feed pipe 21 for solid-liquid separation, and the separated sodium chloride solid (sodium chloride solid contains 93% sodium chloride, 1% hydrazine hydrate and 5% water) will be directly discharged into the solid collection bag 10 (as shown). Figure 3 As shown), at the same time, the liquid outlet valve 14 is opened to discharge the separated hydrazine hydrate liquid (3% sodium chloride, 35% hydrazine hydrate and 60% water) through the liquid outlet pipe 11, and is pumped into the mother liquid collection tank 12 (as shown) through the liquid outlet pump 16. Figure 4 As shown), during the hydrazine hydrate liquid transportation process, the flow meter 15 monitors the flow interlock control adjustment range of the regulating valve 5, so that the flow of the hydrazine hydrate liquid is within a controllable range, and the hydrazine hydrate liquid collected in the mother liquid collection tank 12 can be used as the mother liquid or can be further concentrated and crystallized;

[0027] When the regulating valve 5 fails, the operator opens the emergency valve 20 to discharge the hydrazine hydrate solution into the reflux pipe 7 and the feed pipe 21 respectively through the emergency pipe 19. After the regulating valve 5 is repaired or replaced, the emergency valve 20 is closed, so that the solid-liquid separation device can always be in a normal working state, thereby ensuring the working effect and efficiency of the solid-liquid separation device and greatly improving the processing capacity. The processing capacity is 1 to 1.5 tons of sodium chloride solid can be separated per hour, which is suitable for large-scale production.

Claims

1. An interlocking solid-liquid separation device, comprising a centrifuge, characterized in that: It also includes a crystallization kettle connected to the input end of the centrifuge, the output A end of the centrifuge is connected to a solid collection bag, the output B end of the centrifuge is connected to a liquid outlet pipe and connected to a mother liquid collection tank through the liquid outlet pipe, the liquid outlet pipe is sequentially connected to a liquid outlet valve, a flow meter and a liquid outlet pump from front to back, the flow meter is interlocked with a regulating valve, and the regulating valve is connected to a discharge pipe connected between the crystallization kettle and the centrifuge.

2. The interlocking solid-liquid separation device according to claim 1, characterized in that: One end of the liquid outlet pipe is connected to the output B end of the centrifuge, and the other end of the liquid outlet pipe is connected to the input end of the mother liquid collection tank.

3. The interlocking solid-liquid separation device according to claim 2, characterized in that: The mother liquid collecting tank is connected with a drain pipe.

4. The interlocking solid-liquid separation device according to claim 1, characterized in that: The output end of the liquid outlet pump is connected with a check valve and a pressure gauge in sequence from front to back.

5. The interlocking solid-liquid separation device according to claim 1, characterized in that: One end of the discharge pipe is connected to the output end of the crystallization kettle, and the other end of the discharge pipe is connected with a discharge valve, a regulating valve and an observation mirror in sequence from front to back and is divided into two paths through the discharge valve and the regulating valve: one path is connected to the feed pipe and is connected to the input end of the centrifuge through the feed pipe, and the other path is connected to the reflux pipe and is connected to the reflux end of the crystallization kettle through the reflux pipe.

6. The interlocking solid-liquid separation device according to claim 5, characterized in that: One end of the material delivery pipe is connected to the other end of the material discharge pipe, and the other end of the material delivery pipe is connected to the input end of the centrifuge.

7. The interlocking solid-liquid separation device according to claim 5, characterized in that: One end of the reflux pipe is connected to the other end of the discharge pipe, and the other end of the reflux pipe is connected to a reflux pump and is connected to the reflux end of the crystallization kettle through the reflux pump.

8. The interlocking solid-liquid separation device according to claim 7, characterized in that: The crystallization kettle is provided with a stirring device, and a stirring mechanism of the stirring device extends from the outer top of the crystallization kettle to the inside of the crystallization kettle and rotates inside the crystallization kettle.

9. The interlocking solid-liquid separation device according to claim 5, characterized in that: The discharge pipe is also connected to an emergency pipe, which is connected to an emergency valve and is connected to the feed pipe and the reflux pipe through the emergency valve.

10. The interlocking solid-liquid separation device according to claim 9, characterized in that: The connection between one end of the emergency pipe and the discharge pipe is arranged at the front end of the regulating valve, and the connection between the other end of the emergency pipe and the discharge pipe is arranged at the rear end of the regulating valve.

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