Liquid sodium feeding system in indigo production process

Abstract

The utility model discloses a liquid sodium feeding system in an indigo production process. The liquid sodium feeding system comprises a movable liquid sodium tank, a liquid sodium storage tank, a metering tank, a sodium ammonia kettle, a nitrogen pipeline and a vacuum pump, a liquid outlet of the mobile liquid sodium tank is communicated with a liquid inlet of the liquid sodium storage tank, a liquid outlet of the liquid sodium storage tank is communicated with a liquid inlet of the metering tank, a liquid outlet of the metering tank is communicated with a liquid inlet of the sodium ammonia kettle, and a gas outlet of the nitrogen pipeline is respectively communicated with a gas inlet of the mobile liquid sodium tank, a gas inlet of the liquid sodium storage tank and a gas vent of the metering tank; an air outlet of the liquid sodium storage tank and an air vent of the metering tank are communicated with an air inlet of the vacuum pump. The connecting structure has the advantages that the connecting structure is simple and easy to implement, manual transportation is not needed in the whole process, potential safety hazards are reduced, the safety of workers is greatly protected, and meanwhile the labor cost is reduced; and nitrogen protection is adopted in the whole conveying process, sodium oil is not needed, and then the quality of subsequent products is guaranteed.

Description

Technical field:

[0001] The utility model relates to a liquid sodium feeding system, in particular to a liquid sodium feeding system in an indigo production process. Background technology:

[0002] At present, the method for manufacturing indigo is to firstly mix phenylaminoacetonitrile with mixed alkali recovered by an alkali recovery system for hydrolysis reaction to obtain potassium (sodium) anilinoacetate, then mix potassium (sodium) anilinoacetate with sodium amide in a reactor to react to obtain potassium (sodium) indoxylphenol, then send it to an oxidation reactor and blow air into it for further oxidation to obtain dioxybisindoxylphenol, and then filter it through a product filter press to obtain an indigo filter cake; wherein sodium amide is obtained by the reaction of liquid metallic sodium and ammonia in a sodium ammonia reactor, and currently liquid metallic sodium is obtained by purchasing, and the purchased liquid metallic sodium is unloaded manually from a mobile liquid sodium tank on a transport vehicle, and then the metallic sodium is prepared and fed manually, and since metallic sodium is prone to spontaneous combustion, sodium oil is required for protection, but feeding a large amount of sodium oil into the sodium ammonia reactor will affect the quality of the product; and manual feeding is very likely to cause splashing accidents in the sodium ammonia reactor, which poses a great safety hazard. Utility model content:

[0003] The utility model aims to provide a liquid sodium feeding system in an indigo production process, which has a simple connection structure, reduces potential safety hazards, and ensures the quality of subsequent products.

[0004] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide a liquid sodium feeding system in an indigo production process, which includes a mobile liquid sodium tank, a liquid sodium storage tank, a metering tank, a sodium-ammonia kettle, a nitrogen pipeline and a vacuum pump; the liquid outlet of the mobile liquid sodium tank is connected to the liquid inlet of the liquid sodium storage tank, the liquid outlet of the liquid sodium storage tank is connected to the liquid inlet of the metering tank, the liquid outlet of the metering tank is connected to the liquid inlet of the sodium-ammonia kettle, the air outlet of the nitrogen pipeline is respectively connected to the air inlet of the mobile liquid sodium tank, the air inlet of the liquid sodium storage tank and the air vent of the metering tank; the air outlet of the liquid sodium storage tank and the air vent of the metering tank are both connected to the air inlet of the vacuum pump.

[0005] Furthermore, it also includes a nitrogen buffer tank, the air outlet of the nitrogen pipeline is connected to the air inlet of the nitrogen buffer tank, and the air outlet of the nitrogen buffer tank is respectively connected to the air inlet of the mobile liquid sodium tank, the air inlet of the liquid sodium storage tank and the air vent of the metering tank.

[0006] Furthermore, it also includes a vacuum buffer tank, the air outlet of the liquid sodium storage tank and the air vent of the metering tank are both connected to the air inlet of the vacuum buffer tank, and the air outlet of the vacuum buffer tank is connected to the air inlet of the vacuum pump.

[0007] Furthermore, it also includes an exhaust pipe, and the air vent of the metering tank is connected to the air inlet of the exhaust pipe.

[0008] Furthermore, it also includes a discharge valve, a cut-off valve, a vent valve and a controller; the discharge valve is arranged on the pipeline between the liquid sodium storage tank and the metering tank, the cut-off valve is arranged on the pipeline between the nitrogen buffer tank and the metering tank, and the vent valve is arranged on the exhaust pipe; the signal output end of the weighing sensor of the metering tank is connected to the signal input end of the controller through a signal; the signal output end of the controller is respectively connected to the signal input ends of the discharge valve, the cut-off valve and the vent valve through a signal.

[0009] Furthermore, an electric heating system is provided on the liquid sodium storage tank.

[0010] Advantages of the utility model: the utility model has a simple connection structure and is easy to implement. The mobile liquid sodium tank, the liquid sodium storage tank and the metering tank are respectively filled with nitrogen, and the liquid sodium storage tank and the metering tank are respectively evacuated to realize the transportation of liquid metallic sodium from the mobile liquid sodium tank to the liquid sodium storage tank, from the heavy liquid sodium storage tank to the metering tank, and from the metering tank to the sodium-ammonia kettle. No manual transportation is required throughout the process, which reduces safety hazards, greatly protects the safety of the staff, and reduces labor costs. Moreover, the entire transportation process is protected by nitrogen, and there is no need to use sodium oil, thereby ensuring the quality of subsequent products. Description of the drawings:

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Mobile liquid sodium tank 1, liquid sodium storage tank 2, metering tank 3, sodium ammonia kettle 4, nitrogen pipeline 5, vacuum pump 6, nitrogen buffer tank 7, vacuum buffer tank 8, exhaust pipe 9, discharge valve 10, cut-off valve 11, vent valve 12, controller 13. Specific implementation method:

[0014] Example: Figure 1As shown, a liquid sodium feeding system in an indigo production process comprises a mobile liquid sodium tank 1, a liquid sodium storage tank 2, a metering tank 3, a sodium ammonia kettle 4, a nitrogen pipeline 5, a vacuum pump 6, a nitrogen buffer tank 7, a vacuum buffer tank 8, an exhaust pipe 9, a discharge valve 10, a cut-off valve 11, a vent valve 12 and a controller 13; the liquid outlet of the mobile liquid sodium tank 1 is connected to the liquid inlet of the liquid sodium storage tank 2, and an electric heating system is provided on the liquid sodium storage tank 2 to keep the temperature in the liquid sodium storage tank 2 between 110 and 120° C. so that the metallic sodium always remains in a liquid state, the liquid outlet of the liquid sodium storage tank 2 is connected to the liquid inlet of the metering tank 3, the liquid outlet of the metering tank 3 is connected to the liquid inlet of the sodium ammonia kettle 4, the air outlet of the nitrogen pipeline 5 is connected to the air inlet of the nitrogen buffer tank 7, and the air outlet of the nitrogen buffer tank 7 is respectively connected to the air inlet of the mobile liquid sodium tank 1, the air inlet of the liquid sodium storage tank 2 and the air vent of the metering tank 3. The air outlet of the liquid sodium storage tank 2 and the air vent of the metering tank 3 are both connected to the air inlet of the vacuum buffer tank 8, and the air outlet of the vacuum buffer tank 8 is connected to the air inlet of the vacuum pump 6; the air vent of the metering tank 3 is connected to the air inlet of the exhaust pipe 9.

[0015] A discharge valve 10 is arranged on the pipeline between the liquid sodium storage tank 2 and the metering tank 3, a cut-off valve 11 is arranged on the pipeline between the nitrogen buffer tank 7 and the metering tank 3, and a vent valve 12 is arranged on the emptying pipe 9; the signal output end of the weighing sensor of the metering tank 3 is connected to the signal input end of the controller 13 through a signal; the signal output end of the controller 13 is respectively connected to the signal input ends of the discharge valve 10, the cut-off valve 11 and the vent valve 12 through a signal.

[0016] Working principle: When the mobile liquid sodium tank 1 containing liquid metallic sodium is transported by a transport vehicle, after the pipeline is connected, nitrogen is introduced into the mobile liquid sodium tank 1, and at the same time, the vacuum pump 6 evacuates the liquid sodium storage tank 2. Under the action of double pressure, the liquid metallic sodium in the mobile liquid sodium tank 1 enters the liquid sodium storage tank 2. After loading and unloading, the nitrogen is stopped and the vacuum pump 6 is turned off.

[0017] When it is necessary to add liquid metallic sodium to the sodium-ammonia kettle 4, the amount of metallic sodium to be added is first set on the controller 13, then nitrogen is passed into the liquid sodium storage tank 2, and the vacuum pump 6 evacuates the measuring tank 3 at the same time. Under the action of the dual pressure, the liquid metallic sodium in the liquid sodium storage tank 2 enters the measuring tank 3, and the weighing sensor on the measuring tank 3 transmits the signal to the controller 13 at all times. When the weight of the metallic sodium in the measuring tank 3 reaches the set value on the controller 13, the controller 13 controls the discharge valve 10 to be closed, and nitrogen is stopped and the vacuum pump 6 is closed at the same time; after a certain time delay, the controller 13 controls the cut-off valve 11 to be opened, nitrogen is passed into the measuring tank 3, and the liquid metallic sodium in the measuring tank 3 is pressed into the sodium-ammonia kettle 4. After the metallic sodium in the measuring tank 3 is exhausted, the controller 13 controls the cut-off valve 11 to be closed, and the vent valve 12 is opened, and the gas in the measuring tank 3 is discharged into the waste gas treatment system for treatment. After the gas is exhausted, the controller 13 controls the vent valve 12 to be closed, and the next round of batching is carried out.

[0018] The utility model has a simple connection structure and is easy to implement. There is no need for manual transportation throughout the entire process, which reduces potential safety hazards, greatly protects the safety of workers, and reduces labor costs. In addition, nitrogen protection is used throughout the transportation process, and there is no need to use sodium oil, thereby ensuring the quality of subsequent products.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid sodium feeding system in an indigo production process, characterized in that: It comprises a mobile liquid sodium tank, a liquid sodium storage tank, a metering tank, a sodium-ammonia kettle, a nitrogen pipeline and a vacuum pump; the liquid outlet of the mobile liquid sodium tank is communicated with the liquid inlet of the liquid sodium storage tank, the liquid outlet of the liquid sodium storage tank is communicated with the liquid inlet of the metering tank, the liquid outlet of the metering tank is communicated with the liquid inlet of the sodium-ammonia kettle, the air outlet of the nitrogen pipeline is respectively communicated with the air inlet of the mobile liquid sodium tank, the air inlet of the liquid sodium storage tank and the air vent of the metering tank; the air outlet of the liquid sodium storage tank and the air vent of the metering tank are both communicated with the air inlet of the vacuum pump.

2. The liquid sodium feeding system in the indigo production process according to claim 1, characterized in that: It also includes a nitrogen buffer tank, the gas outlet of the nitrogen pipeline is connected to the gas inlet of the nitrogen buffer tank, and the gas outlet of the nitrogen buffer tank is respectively connected to the gas inlet of the mobile liquid sodium tank, the gas inlet of the liquid sodium storage tank and the vent of the metering tank.

3. The liquid sodium feeding system in the indigo production process according to claim 2, characterized in that: It also includes a vacuum buffer tank, the air outlet of the liquid sodium storage tank and the air vent of the metering tank are both connected to the air inlet of the vacuum buffer tank, and the air outlet of the vacuum buffer tank is connected to the air inlet of the vacuum pump.

4. The liquid sodium feeding system in the indigo production process according to claim 3, characterized in that: It also includes an exhaust pipe, and the air vent of the metering tank is communicated with the air inlet of the exhaust pipe.

5. The liquid sodium feeding system in the indigo production process according to claim 4, characterized in that: It also includes a discharge valve, a cut-off valve, a vent valve and a controller; the discharge valve is arranged on the pipeline between the liquid sodium storage tank and the metering tank, the cut-off valve is arranged on the pipeline between the nitrogen buffer tank and the metering tank, and the vent valve is arranged on the exhaust pipe; the signal output end of the weighing sensor of the metering tank is connected with the signal input end of the controller through a signal; the signal output end of the controller is respectively connected with the signal input ends of the discharge valve, the cut-off valve and the vent valve through a signal.

6. A liquid sodium feeding system in an indigo production process according to any one of claims 1 to 5, characterized in that: An electric heating system is arranged on the liquid sodium storage tank.

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