Liquid ammonia loading and unloading system in indigo production process

Abstract

The utility model discloses a liquid ammonia loading and unloading system in an indigo blue production process. The liquid ammonia loading and unloading system comprises a liquid ammonia storage tank, an ammonia gas compressor, a first crane pipe, a liquid ammonia tank car and a second crane pipe, a vent hole, a liquid inlet and a liquid outlet are respectively formed in the top of the liquid ammonia storage tank, the vent hole of the liquid ammonia storage tank is communicated with one end of an ammonia gas compressor, the other end of the ammonia gas compressor is communicated with one end of a first crane pipe, and the other end of the first crane pipe is communicated with an upper gas hole of the liquid ammonia tank car; a lower liquid opening of the liquid ammonia tank car is communicated with one end of the second crane pipe, and the other end of the second crane pipe is respectively communicated with a liquid inlet and a liquid outlet of the liquid ammonia storage tank. The utility model has the advantages that the connecting structure is simple and easy to realize, the loading and unloading of liquid ammonia are realized, the liquid ammonia steel cylinder does not need to be manually operated, the hidden dangers of safety and environmental protection are eliminated, the safety is improved, and the operation is convenient and quick; recovery of residual liquid ammonia in the second crane pipe is achieved, waste and environmental pollution of the residual liquid ammonia are avoided, and meanwhile the safety of field personnel is guaranteed.

Description

Technical field:

[0001] The utility model relates to a liquid ammonia loading and unloading system, in particular to a liquid ammonia loading and unloading system in an indigo production process. Background technology:

[0002] At present, the method for making indigo is to first mix potassium (sodium) salt of anilinoacetic acid with sodium amide in an alkali melting kettle to react to obtain potassium (sodium) indoxyphenol, and then send it to an oxidation kettle and blow air into it for further oxidation to obtain dioxybisindoxyphenol (i.e. indigo); wherein the process for producing potassium (sodium) salt of anilinoacetic acid is to mix anilinoacetonitrile, liquid potassium hydroxide and mixed alkali solution (from the alkali recovery section) in a hydrolysis reactor and hydrolyze at room temperature. After the hydrolysis is completed, the ammonia waste gas generated by the hydrolysis is discharged by heating to 100°C with steam. The mother liquor in the hydrolysis reactor after ammonia discharge enters a central evaporator for concentration, and then enters a drum dryer for drying to obtain potassium (sodium) salt of anilinoacetic acid and send it to an alkali melting kettle; the process for producing sodium amide is to send the ammonia gas and metallic sodium after the liquid ammonia is vaporized by the evaporator to an amino pot for synthesis reaction, and the obtained sodium amide is pumped to the alkali melting kettle by a vacuum pump; hydrogen and ammonia waste gas are also generated during the synthesis reaction. Patent No. CN202022809961.0 discloses a patent for an indigo production ammonia recovery system, which discloses that the ammonia waste gas generated by the production of potassium (sodium) anilinoacetate and the ammonia waste gas brought out by the production of sodium amide are recovered to make liquid ammonia and stored in a liquid ammonia storage tank, which is subsequently used as a synthetic raw material for sodium amide, and the excess is sold as a liquid ammonia product. Therefore, liquid ammonia loading and unloading vehicles are often required. Currently, most liquid ammonia loading and unloading is carried out through liquid ammonia cylinders, that is, liquid ammonia loading and unloading is achieved through manual operation of the connection between the liquid ammonia cylinders and the liquid ammonia tank trucks and liquid ammonia storage tanks; there are safety hazards in the liquid ammonia cylinders' anti-collision, sun protection, bottle mouth connection, and filling volume control links. The operation is relatively simple and there are great environmental hazards. Utility model content:

[0003] The utility model aims to provide a liquid ammonia loading and unloading system in an indigo production process, which has a simple connection structure, improved safety, and convenient and quick operation.

[0004] The utility model is implemented by the following technical scheme: The purpose of this patent is to provide a liquid ammonia loading and unloading system in the indigo production process, which includes a liquid ammonia storage tank, an ammonia compressor, a first crane pipe, a liquid ammonia tank truck and a second crane pipe; an air vent, a liquid inlet and a liquid outlet are respectively opened on the top of the liquid ammonia storage tank, the air vent of the liquid ammonia storage tank is connected to one end of the ammonia compressor, the other end of the ammonia compressor is connected to one end of the first crane pipe, and the other end of the first crane pipe is connected to the upper air port of the liquid ammonia tank truck; the lower liquid port of the liquid ammonia tank truck is connected to one end of the second crane pipe, and the other end of the second crane pipe is respectively connected to the liquid inlet and liquid outlet of the liquid ammonia storage tank.

[0005] Furthermore, a liquid outlet pipe is connected and inserted in the liquid outlet, and the bottom of the liquid outlet pipe is placed at the bottom of the liquid ammonia storage tank.

[0006] Furthermore, it also includes an ammonia storage tank, an air pump, a dust hood and a fan, the air outlet of the ammonia storage tank is connected to the air inlet of the air pump, and the air outlet of the air pump is connected to the end of the second crane pipe away from the liquid ammonia tank truck; the dust hood is arranged above the connecting end of the liquid ammonia tank truck and the first crane pipe and the second crane pipe, the air outlet of the dust hood is connected to the air inlet of the fan, and the air outlet of the fan is connected to the air inlet of the ammonia absorption tower of the ammonia recovery system.

[0007] Advantages of the utility model: 1. The connection structure of the utility model is simple and easy to implement. By setting an ammonia compressor that can rotate forward and reverse, the ammonia above the liquid ammonia tank truck / liquid ammonia storage tank is transported to the liquid ammonia storage tank / liquid ammonia tank truck to increase the internal pressure of one of them, and the liquid ammonia therein is transported to the side with lower pressure, so as to realize the loading and unloading of liquid ammonia. There is no need to manually operate the liquid ammonia cylinder, which eliminates safety and environmental protection risks, improves safety, and is convenient and quick to operate; 2. After loading and unloading the liquid ammonia, ammonia is introduced into the second crane pipe for purging, and the liquid ammonia in the second crane pipe is blown back into the liquid ammonia tank truck, so that the residual liquid ammonia in the second crane pipe is recovered, avoiding its waste and pollution of the environment, and ensuring the safety of on-site personnel at the same time; 3. After purging for a certain period of time, it stops, and then the fan is turned on, and then the connection between the first crane pipe, the second crane pipe and the liquid ammonia tank truck is disconnected respectively, and the fan pumps the residual ammonia discharged from the first crane pipe and the second crane pipe to the ammonia recovery system for recovery, avoiding its waste and pollution of the environment. Description of the drawings:

[0008] 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.

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0010] Liquid ammonia storage tank 1, ammonia compressor 2, first crane pipe 3, liquid ammonia tank truck 4, second crane pipe 5, ammonia storage tank 6, air pump 7, dust hood 8, fan 9, liquid outlet pipe 10. Specific implementation method:

[0011] Example: Figure 1As shown, a liquid ammonia loading and unloading system in an indigo production process comprises a liquid ammonia storage tank 1, an ammonia compressor 2, a first crane pipe 3, a liquid ammonia tank truck 4, a second crane pipe 5, an ammonia storage tank 6, an air pump 7, a dust hood 8 and a fan 9; an air vent, a liquid inlet and a liquid outlet are respectively opened on the top of the liquid ammonia storage tank 1, the air vent of the liquid ammonia storage tank 1 is connected to one end of the ammonia compressor 2, the other end of the ammonia compressor 2 is connected to one end of the first crane pipe 3, and the other end of the first crane pipe 3 is connected to the upper air port of the liquid ammonia tank truck 4; the lower liquid port of the liquid ammonia tank truck 4 is connected to one end of the second crane pipe 5, and the other end of the second crane pipe 5 is respectively connected to the liquid inlet and the liquid outlet of the liquid ammonia storage tank 1, and a liquid outlet pipe 10 is connected and inserted in the liquid outlet, and the bottom of the liquid outlet pipe 10 is placed at the bottom of the liquid ammonia storage tank 1.

[0012] The air outlet of the ammonia storage tank 6 is connected to the air inlet of the air pump 7, and the air outlet of the air pump 7 is connected to the end of the second crane pipe 5 away from the liquid ammonia tank truck 4; a dust hood 8 is arranged above the connecting end of the liquid ammonia tank truck 4 and the first crane pipe 3 and the second crane pipe 5, and the air outlet of the dust hood 8 is connected to the air inlet of the fan 9, and the air outlet of the fan 9 is connected to the air inlet of the ammonia absorption tower of the ammonia recovery system.

[0013] Working principle:

[0014] When unloading: the first crane pipe 3 and the second crane pipe 5 are connected to the liquid ammonia tank truck 4 respectively, the pipeline valve on the gas-liquid inlet of the liquid ammonia storage tank 1 is opened, the ammonia compressor 2 starts to rotate forward to transport the ammonia in the liquid ammonia storage tank 1 to the liquid ammonia tank truck 4, and the gas phase in the liquid ammonia tank truck 4 is pressurized. After the pressure in the liquid ammonia tank truck 4 increases, the liquid ammonia is pressed into the liquid ammonia storage tank 1, and the gas pressure in the liquid ammonia storage tank 1 is then transported to the liquid ammonia tank truck 4 by the ammonia compressor 2 to form a process cycle.

[0015] During loading: the first crane pipe 3 and the second crane pipe 5 are respectively connected to the liquid ammonia tank truck 4, the pipeline valve on the gas-liquid outlet of the liquid ammonia storage tank 1 is opened, the ammonia compressor 2 starts to reverse and transports the ammonia in the liquid ammonia tank truck 4 to the corresponding liquid ammonia storage tank 1 being loaded, and after the pressure in the liquid ammonia storage tank 1 increases, the liquid ammonia is transported to the liquid ammonia tank truck 4 through the submerged liquid outlet pipe 10 to form a process cycle.

[0016] The utility model realizes the loading and unloading of liquid ammonia without manual operation of the liquid ammonia cylinder, eliminates safety and environmental protection hidden dangers, improves safety, and is convenient and quick to operate.

[0017] After completing loading and unloading, close the valve on the pipeline, turn on the air pump 7, transport the ammonia to the second crane pipe 5, and blow the liquid ammonia in the second crane pipe 5 back into the liquid ammonia tank truck 4, so as to realize the recovery of the residual liquid ammonia in the second crane pipe 5, avoid its waste and pollution of the environment, and ensure the safety of the on-site personnel at the same time; after blowing for a certain period of time, stop the air pump 7, then turn on the fan 9, and then disconnect the first crane pipe 3, the second crane pipe 5 from the liquid ammonia tank truck 4 respectively, and the fan 9 pumps the residual ammonia discharged from the first crane pipe 3 and the second crane pipe 5 to the ammonia recovery system for recovery, so as to avoid its waste and pollution of the environment.

[0018] 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 ammonia loading and unloading system in an indigo production process, characterized in that: It includes a liquid ammonia storage tank, an ammonia compressor, a first crane pipe, a liquid ammonia tank truck and a second crane pipe; A vent, a liquid inlet and a liquid outlet are respectively provided on the top of the liquid ammonia storage tank, the vent of the liquid ammonia storage tank is connected to one end of the ammonia compressor, the other end of the ammonia compressor is connected to one end of the first lifting pipe, and the other end of the first lifting pipe is connected to the upper air port of the liquid ammonia tank truck; The lower liquid inlet of the liquid ammonia tank truck is connected to one end of the second lifting pipe, and the other end of the second lifting pipe is respectively connected to the liquid inlet and the liquid outlet of the liquid ammonia storage tank.

2. The liquid ammonia loading and unloading system in the indigo production process according to claim 1, characterized in that: A liquid outlet pipe is connected and inserted in the liquid outlet, and the bottom of the liquid outlet pipe is placed at the bottom of the liquid ammonia storage tank.

3. The liquid ammonia loading and unloading system in the indigo production process according to claim 1 or 2, characterized in that: It also includes an ammonia storage tank, an air pump, a dust hood and a fan. The air outlet of the ammonia storage tank is connected to the air inlet of the air pump, and the air outlet of the air pump is connected to the end of the second lifting pipe away from the liquid ammonia tank truck; the dust hood is arranged above the connecting end of the liquid ammonia tank truck and the first lifting pipe and the second lifting pipe, the air outlet of the dust hood is connected to the air inlet of the fan, and the air outlet of the fan is connected to the air inlet of the ammonia absorption tower of the ammonia recovery system.

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