CN114719181A - Ammonia storage tank differential pressure unloading method and ammonia unloading device - Google Patents

Abstract

The invention provides a differential pressure ammonia unloading method for an ammonia storage tank and an ammonia unloading device thereof. The device includes a tank body, and a gas ammonia door, a liquid ammonia door, a pressure regulating door and a liquid ammonia evaporator installed on the top of the tank body. and a heat preservation mechanism is provided on the part of the tank body. The invention can replace the ammonia unloading compressor, utilize the heating of the liquid ammonia evaporator to vaporize the liquefied ammonia, control the pressure difference between the ammonia storage tanks to complete the ammonia unloading operation, and the mutual inversion operation between the ammonia storage tanks. Especially in winter, when the external ambient temperature is low, the failure rate of the ammonia unloading compressor is too high and cannot work, the effect of the present invention is more prominent.

Description

Ammonia storage tank differential pressure unloading method and ammonia unloading device

technical field

The invention mainly relates to the technical field of ammonia unloading from an ammonia storage tank, in particular to a differential pressure ammonia unloading method for an ammonia storage tank and an ammonia unloading device thereof.

Background technique

Ammonia is a compound of nitrogen and hydrogen with the molecular formula NH ₃ . It is a colorless gas at room temperature with a strong irritating odor. Liquid ammonia is very dangerous. important part.

Coal-fired power plants use ammonia gas to remove NOX, and outsourced liquid ammonia is unloaded to ammonia storage tanks using ammonia unloading compressors. At present, the failure rate of ammonia unloading compressors is extremely high, especially in winter, which causes great difficulties in unloading ammonia. Seriously affect the safe operation of the denitration system of the unit.

SUMMARY OF THE INVENTION

The present invention mainly provides an ammonia storage tank differential pressure ammonia unloading method and an ammonia unloading device to solve the technical problems raised in the above background technology.

The technical scheme adopted by the present invention to solve the above-mentioned technical problems is:

Ammonia storage tank differential pressure unloading method, including the following steps:

Step 1: Open the regulating door of the first liquid ammonia evaporator, adjust the auxiliary steam to the first liquid ammonia evaporator, increase the pressure in the first ammonia storage tank through the first liquid ammonia evaporator, and keep the pressure in the first ammonia storage tank. The pressure is higher than the pressure in the second ammonia storage tank, and the pressure difference is 0.2MPa;

Step 2, close the entrance and exit door of the ammonia unloading compressor;

Step 3, successively open the bypass door of the ammonia unloading compressor, the gas ammonia door of the first ammonia storage tank, the gas phase isolation door of the tank car, the liquid ammonia door of the second ammonia storage tank and the liquid phase isolation door of the tank car, to Unload the ammonia liquid inside the tanker to the inside of the second ammonia storage tank;

Step 4, after the ammonia unloading work is finished, close the regulating door of the first liquid ammonia evaporator, the gas ammonia door of the first ammonia storage tank, the liquid ammonia door of the second ammonia storage tank, the gas phase isolation door of the tank car, and the tank car in turn. The liquid phase isolation door and the bypass door of the ammonia unloading compressor.

According to the above technical scheme of the ammonia storage tank differential pressure ammonia unloading method, an ammonia unloading device for the ammonia storage tank differential pressure ammonia unloading method will also be provided, including a tank car, and a first ammonia storage tank connected to the tank car through a pipeline. tank and a second ammonia storage tank, the first ammonia storage tank is connected with a first liquid ammonia vaporizer through a pipeline, the second ammonia storage tank is connected with a second liquid ammonia vaporizer through a pipeline, and the first ammonia storage tank is connected with a second liquid ammonia vaporizer through a pipeline. The structure of the tank and the second ammonia storage tank are the same. The first ammonia storage tank includes a tank body, and a gas ammonia door, a liquid ammonia door and a pressure regulating door installed on the top of the tank body. There is a thermal insulation layer, and a thermal insulation mechanism is sleeved on the outside of the thermal insulation layer.

Further, the thermal insulation mechanism includes a thermal insulation jacket sleeved on the outer surface of the thermal insulation layer, an air intake assembly arranged on the bottom of one end of the thermal insulation jacket, and an air inlet assembly arranged inside the thermal insulation jacket and connected to the air inlet. The gas outlet component connected to the input end of the component, in the present invention, maintains heat preservation for the tank body to prevent the temperature in the tank body from being too low, which requires long-time heating.

Further, the air intake assembly includes a first air intake pipe connected to the air outlet end of the first liquid ammonia evaporator, a first three-way pipe connected to the air outlet end of the first air intake pipe, and a first three-way pipe connected to the air outlet end of the first air intake pipe. Two second air intake pipes connected to the air outlet ends of the first three-way pipe, and one end of the second air intake pipe away from the first three-way pipe extends to the inside of the thermal insulation jacket. In the present invention, The hot air is supplied from both sides of the bottom end of the insulation jacket to provide uniformity of the hot air inside the insulation jacket.

Further, the air outlet assembly includes an air delivery pipe connected to one end of the second air inlet pipe extending to the interior of the thermal insulation jacket, and is sequentially installed on the first filter plates on the outer surfaces of both sides of the thermal insulation layer from top to bottom. , and a second filter plate arranged between two adjacent first filter plates and mounted on the inner wall surface of the heat preservation jacket.

Further, a plurality of air outlet heads are sequentially installed on the top of the air delivery pipe, and the plurality of air outlet heads are arranged obliquely. The ascent is carried out to facilitate the rise of the hot gas and the effective contact with the tank.

Further, the heat preservation mechanism further includes an air return assembly, and the air return assembly includes a return air hood installed on the top of the insulating layer and arranged symmetrically, and a first air return pipe connected to the top of the air return hood. , and a second three-way pipe connected with one end of the two first air return pipes away from the air return hood, the air outlet end of the second three-way pipe is connected with a second air return pipe, in the present invention, through the return air pipe The air hood receives the hot air that expands and rises from the inside of the tank body, and the hot air guided through the air return hood is discharged through the first air return pipe.

Further, the longitudinal section of the air return hood is trapezoidal. In the present invention, since the air return hood has a large and small head structure, the air return hood can receive more hot air and concentrate it so as to facilitate the first air return pipe. of gas.

Further, the air return assembly also includes a fan connected to the air outlet end of the second air return pipe, the air outlet end of the fan is connected with a third air return pipe, and the third air return pipe is away from the end of the fan. It is connected with the first air inlet pipe. In the present invention, the hot air is recirculated from the first air inlet pipe to the bottom of the insulation jacket to prevent the hot gas from expanding and rising and accumulating at the top of the insulation jacket, resulting in the insulation effect of the insulation jacket. Not uniform enough.

Further, a one-way valve is connected to the casing of the third air return pipe.

Compared with the prior art, the beneficial effects of the present invention are:

First, the present invention can overcome the low ambient temperature, especially in winter, when the ammonia unloading compressor is in use, the failure rate is too high, resulting in insufficient ammonia unloading power of the ammonia storage tank, and when the ammonia unloading compressor fails. , the ammonia storage tanks can still unload ammonia from each other, specifically: the faulty ammonia unloading compressor takes the bypass to form a pressure difference between different ammonia storage tanks, and the ammonia storage tank with high pressure and the ammonia storage tank to be unloaded are used to press The difference provides power for ammonia discharge, so that the ammonia storage tank discharges ammonia by means of differential pressure.

Second, the present invention utilizes the hot waste gas discharged from the liquid ammonia evaporator to provide efficient and uniform heat preservation for the tank body of the ammonia storage tank, so as to facilitate the subsequent heating of the ammonia storage tank, specifically: storing the hot air through the heat preservation jacket, because The thermal insulation sleeve is set on the outside of the tank body, so as to keep the tank body warm and prevent the temperature in the tank from being too low, which requires long-term heating. The hot gas advances along the S shape to increase the time that the hot gas stays inside the insulation jacket, so that the hot gas can fully contact the tank body.

The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the schematic diagram of the present invention;

Fig. 2 is the structural representation of the first ammonia storage tank of the present invention;

Fig. 3 is the axonometric view of the first ammonia storage tank of the present invention;

Fig. 4 is the top view of the present invention;

Figure 5 is a cross-sectional view along line A-A in Figure 4;

Fig. 6 is the enlarged view of the structure of A area in Fig. 5;

7 is a schematic diagram of Embodiment 1 of the present invention;

FIG. 8 is a schematic diagram of Embodiment 2 of the present invention.

In the figure: 10, the first liquid ammonia evaporator; 20, the first ammonia storage tank; 21, the tank body; 22, the gas ammonia door; 23, the liquid ammonia door; 24, the regulating door; 25, the heat preservation mechanism; 251, the heat preservation sleeve; 252, air intake assembly; 2521, first air intake pipe; 2522, first three-way pipe; 2523, second air intake pipe; 253, air outlet assembly; 2531, air delivery pipe; 2532, first filter plate; 2533, No. 2. filter plate; 254, air return assembly; 2541, air return hood; 2542, first air return pipe; 2543, second three-way pipe; 2544, second air return pipe; 2545, fan; 2546, third air return pipe; 2547 , one-way valve; 26, ammonia discharge door; 27, insulation layer; 30, second ammonia storage tank; 40, ammonia unloading compressor; 50, tank car; 60, second liquid ammonia evaporator.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings, in which several embodiments of the present invention are given, but the present invention can be implemented in different forms and is not limited to the description in the text rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that when an element is referred to as being "fixed" to another element, it may be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it may be The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for the purpose of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated by one of ordinary skill in the technical field of the present invention, and the terminology used herein in the description of the present invention is used for the purpose of describing specific embodiments. For the purpose of, and not intended to limit, the present invention, as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Embodiment 1, please refer to accompanying drawing 1-7, ammonia storage tank differential pressure unloading ammonia method, comprises the following steps:

Step 1: Open the regulating door of the first liquid ammonia vaporizer 10, adjust the auxiliary steam to the first liquid ammonia vaporizer 10, increase the pressure in the first ammonia storage tank 20 through the first liquid ammonia vaporizer 10, and maintain the first ammonia vaporizer. The pressure in the storage tank 20 is higher than the pressure in the second ammonia storage tank 30, and the pressure difference is 0.2MPa;

Step 2, close the entrance and exit door of ammonia unloading compressor 40;

Step 3, sequentially open the bypass door of the ammonia unloading compressor 40, the gas ammonia door 22 of the first ammonia storage tank 20, the gas phase isolation door of the tank car 50, the liquid ammonia door 23 of the second ammonia storage tank 30 and the tank car 50. The liquid phase isolation door, to unload the ammonia liquid inside the tank car 50 to the inside of the second ammonia storage tank 30;

Step 4: After the ammonia unloading work is finished, close the regulating door of the first liquid ammonia evaporator 10, the gas ammonia door 22 of the first ammonia storage tank 20, the liquid ammonia door 23 of the second ammonia storage tank 30, and the tank car 50 in turn. The gas phase isolation door, the liquid phase isolation door of the tank car 50 and the bypass door of the ammonia unloading compressor 40;

Further, the first ammonia storage tank 20 and the second ammonia storage tank 30 may be set as one set of ammonia unloading components, and there may be multiple sets of ammonia unloading components in the ammonia unloading system.

Specifically, please refer to FIGS. 2 and 3, including a tank car 50, and a first ammonia storage tank 20 and a second ammonia storage tank 30 connected to the tank car 50 through pipelines. The first ammonia storage tank 20 is connected with a first liquid ammonia vaporizer 10 through a pipeline, the second ammonia storage tank 30 is connected with a second liquid ammonia vaporizer 60 through a pipeline, and the structure of the first ammonia storage tank 20 and the second ammonia storage tank 30 Similarly, the first ammonia storage tank 20 includes a tank body 21 , a gas ammonia door 22 , a liquid ammonia door 23 and a pressure regulating door 24 installed at the top of the tank body 21 , and the outside of the tank body 21 is provided with thermal insulation layer 27, the outer part of the thermal insulation layer 27 is sheathed with a thermal insulation mechanism 25;

The heat preservation mechanism 25 includes a heat preservation sleeve 251 sleeved on the outer surface of the heat preservation layer 27, an air intake assembly 252 disposed at the bottom of one end of the heat preservation sleeve 251, and an air intake assembly 252 disposed inside the heat preservation sleeve 251 and connected to the heat preservation sleeve 251. The air outlet assembly 253 connected to the input end of the air inlet assembly 252;

It should be noted that, in this embodiment, the first ammonia storage tank 20 takes in and out gas through the gas ammonia door 22 on its tank body 21 , and the first ammonia storage tank 20 passes through the liquid ammonia door 23 on its tank body 21 . Liquid inlet and outlet, the first ammonia storage tank 20 is connected with the first liquid ammonia evaporator 10 through the pressure regulating door 24 on the tank body 21;

In the same way, the second ammonia storage tank 30 is connected to the second liquid ammonia vaporizer 60 through the pressure regulating valve 24 , and the second ammonia storage tank 30 enters and exits the gas through the gas ammonia valve 22 , enters and exits the liquid through the liquid ammonia valve 23 , and is connected to the second liquid ammonia evaporator 60 through the pressure regulating valve 24 ;

Further, the heat preservation sleeve 251 is used to store the hot air. Since the heat preservation sleeve 251 is sleeved on the outside of the tank body 21, the tank body 21 is insulated to prevent the inner temperature of the tank body 21 from being too low, which requires long-time heating.

Specifically, please refer to FIGS. 2 and 5 , the air intake assembly 252 includes a first air intake pipe 2521 connected to the air outlet end of the first liquid ammonia vaporizer 10 , and the first air intake pipe 2521 is connected to the first air intake pipe 2521 . A first three-way pipe 2522 connected to the air outlet end, and two second air intake pipes 2523 connected to the air outlet end of the first three-way pipe 2522, the second air intake pipes 2523 are far away from the first three-way pipe One end of the tube 2522 extends to the interior of the thermal insulation jacket 251;

The air outlet assembly 253 includes an air delivery pipe 2531 connected to one end of the second air inlet pipe 2523 extending to the interior of the insulation jacket 251 , and is sequentially installed on the first side of the outer surface of the insulation layer 27 from top to bottom. a filter plate 2532, and a second filter plate 2533 disposed between two adjacent first filter plates 2532 and mounted on the inner wall surface of the heat preservation jacket 251;

A plurality of air outlet heads 2534 are sequentially installed on the top of the air delivery pipe 2531, and the plurality of air outlet heads 2534 are arranged obliquely;

It should be noted that, in this embodiment, the steam heating pipe is inserted into the tank body 21 to assist the heating of the ammonia liquid in the tank body 21 through the steam heating pipe, and the steam heating pipe is divided by the three-way pipe, so that the diverted A part of the steam enters the first intake pipe 2521, and the material of the thermal insulation layer 27 is thermal insulation cotton, so that the tank body 21 is kept warm by the thermal insulation cotton. In the two second air intake pipes 2523, air and hot air are supplied from both sides of the bottom end of the thermal insulation jacket 251 to provide uniformity of the hot air inside the thermal insulation jacket 251. The inside of the thermal insulation jacket 251 is provided with a heating copper tube to assist the heating of the thermal insulation jacket 251. internal heat;

Further, the hot air in the second air inlet pipe 2523 enters the air transmission pipe 2531 and is discharged through the air transmission pipe 2531, and the exhausted hot air is blocked by the first filter plate 2532 and the second filter plate 2533 arranged in a staggered manner, so as to be fully compatible with the first filter plate 2532 and the second filter plate 2533. The plate 2532 and the second filter plate 2533 are in contact to perform sufficient filtration, and by being blocked by the first filter plate 2532 and the second filter plate 2533, the plate 2532 and the second filter plate 2533 move forward along the S shape, so as to increase the time that the hot air stays inside the insulation jacket 251 , so that the hot air is in full contact with the tank body 21;

Further, the air pipe 2531 discharges air through the air outlet head 2534 on the upper air outlet, and the air outlet head 2534 is inclined, so that the hot air ejected by the air outlet head 2534 rises against the arc surface formed by the tank body 21 and the insulation jacket 251, so as to facilitate Rise to hot air and effective contact with tank 21 .

Specifically, please refer to FIGS. 3 , 5 and 6 , the heat preservation mechanism 25 further includes an air return assembly 254 , and the air return assembly 254 includes a return air cover 2541 installed on the top of the heat preservation layer 27 and symmetrically arranged , a first air return pipe 2542 connected to the top of the air return cover 2541, and a second three-way pipe 2543 connected to the ends of the two first air return pipes 2542 away from the air return cover 2541. A second air return pipe 2544 is connected to the air outlet end of the two or three-way pipe 2543;

The air return assembly 254 further includes a fan 2545 connected to the air outlet end of the second air return pipe 2544, and a third air return pipe 2546 is connected to the air outlet end of the fan 2545, and the third air return pipe 2546 One end of the fan 2545 is connected with the first air intake pipe 2521;

The longitudinal section of the air return hood 2541 is trapezoidal;

A one-way valve 2547 is connected to the casing of the third air return pipe 2546;

It should be noted that, in this embodiment, the hot air that expands and rises from the inside of the tank body 21 is received through the air return hood 2541, and the hot air that is guided through the air return hood 2541 is discharged through the first air return pipe 2542;

Further, since the air return hood 2541 has a large and small head structure, the air return hood 2541 can receive more hot air and concentrate it, so as to facilitate the air delivery of the first air return pipe 2542;

Further, the hot air in the second air return pipe 2544 is guided to be discharged by the fan 2545, and the hot air enters the third air return pipe 2546, and returns to the first air intake pipe 2521 through the third air return pipe 2546, so that the first air intake pipe 2521 Reflow back to the bottom of the thermal insulation jacket 251 to prevent the hot air in it from expanding and rising, and accumulating on the top of the thermal insulation jacket 251, resulting in an insufficiently uniform thermal insulation effect of the thermal insulation jacket 251;

Further, the third air return pipe 2546 restricts the flow direction of the hot air in the third air return pipe 2546 through the one-way valve 2547, so as to prevent the hot air in the first air intake pipe 2521 from flowing back to the third air return pipe 2546 and affect the air outlet of the third air return pipe 2546.

Embodiment 2, please refer to accompanying drawing 8, ammonia storage tank differential pressure unloading ammonia method, comprises the following steps:

Step 1: Open the regulating door of the first liquid ammonia vaporizer 10, adjust the auxiliary steam to the first liquid ammonia vaporizer 10, increase the pressure in the first ammonia storage tank 20 through the first liquid ammonia vaporizer 10, and maintain the first ammonia vaporizer. The pressure in the storage tank 20 is higher than the pressure in the second ammonia storage tank 30, and the pressure difference is 0.2MPa;

Step 2, close the entrance and exit door of the ammonia unloading compressor 40 and the bypass door of the ammonia unloading compressor 40;

Step 3, open the liquid ammonia door 23 of the first ammonia storage tank 20, the ammonia discharge door 26 of the first ammonia storage tank 20, and the liquid ammonia door 23 of the second ammonia storage tank 30 in turn, so as to remove the inside of the first ammonia storage tank 20. The ammonia liquid is discharged to the inside of the second ammonia storage tank 30;

Step 4, after the ammonia unloading work is finished, close the liquid ammonia door 23 of the second liquid ammonia evaporator 60, the ammonia discharge door 26 of the first ammonia storage tank 20 and the liquid ammonia door 23 of the first ammonia storage tank 20 in sequence;

It should be noted that, in this embodiment, two pipelines are arranged between the first ammonia storage tank 20 and the second ammonia storage tank 30, and each pipeline is provided with a pump body and a liquid ammonia door 23 to assist the first ammonia storage tank 20 The inverted tank between the ammonia storage tank 20 and the second ammonia storage tank 30 .

The specific operation mode of the present invention is as follows:

Open the regulating door of the first liquid ammonia evaporator 10, adjust the auxiliary steam to the first liquid ammonia evaporator 10, increase the pressure in the first ammonia storage tank 20 through the first liquid ammonia evaporator 10, and keep the first ammonia storage tank 20 When the pressure in the tank is higher than the pressure in the second ammonia storage tank 30, and the pressure difference is 0.2MPa, close the inlet and outlet door of the ammonia unloading compressor 40;

Open the bypass door of the ammonia unloading compressor 40, the gas ammonia door 22 of the first ammonia storage tank 20, the gas phase isolation door of the tank car 50, the liquid ammonia door 23 of the second ammonia storage tank 30, and the liquid phase door of the tank car 50 in sequence. Isolation door, to carry out the ammonia unloading work of the second ammonia storage tank 30;

After the unloading of ammonia is completed, the regulating door of the first liquid ammonia evaporator 10, the gas ammonia door 22 of the first ammonia storage tank 20, the liquid ammonia door 23 of the second ammonia storage tank 30, and the gas phase isolation door of the tank car 50 are sequentially closed. , the liquid phase isolation door of the tank car 50 and the bypass door of the ammonia unloading compressor 40;

Open the regulating door of the second liquid ammonia evaporator 60, adjust the auxiliary steam to the second liquid ammonia evaporator 60, increase the pressure in the second ammonia storage tank 30 through the second liquid ammonia evaporator 60, and maintain the second ammonia storage tank 30 When the pressure in the tank is higher than the pressure in the first ammonia storage tank 20, and the pressure difference is 0.2MPa, close the inlet and outlet door of the ammonia unloading compressor 40;

Open the bypass door of the ammonia unloading compressor 40, the gas ammonia door 22 of the second ammonia storage tank 30, the gas phase isolation door of the tank car 50, the liquid ammonia door 23 of the first ammonia storage tank 20, and the liquid phase door of the tank car 50 in sequence. Isolation door, to carry out the ammonia unloading work of the first ammonia storage tank 20;

After the unloading of ammonia, the regulating door of the second liquid ammonia evaporator 60, the gas ammonia door 22 of the second ammonia storage tank 30, the liquid ammonia door 23 of the first ammonia storage tank 20, and the gas phase isolation door of the tank car 50 are closed in sequence. , the liquid phase isolation door of the tank car 50 and the bypass door of the ammonia unloading compressor 40 .

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as the non-substantial improvement of the method concept and technical solution of the present invention is adopted, or the present invention is modified without improvement. If the concept and technical solutions of the invention are directly applied to other occasions, they all fall within the protection scope of the present invention.

Claims (10)

1. ammonia storage tank differential pressure unloading ammonia method, is characterized in that, comprises the following steps: Step 1, open the adjustment door of the first liquid ammonia evaporator (10), adjust the auxiliary steam to the first liquid ammonia evaporator (10), and raise the first ammonia storage tank (20) through the first liquid ammonia evaporator (10). The pressure in the tank is to keep the pressure in the first ammonia storage tank (20) higher than the pressure in the second ammonia storage tank (30), and the pressure difference is 0.2MPa; Step 2, close the entrance and exit door of the ammonia unloading compressor (40); Step 3, sequentially open the bypass door of the ammonia unloading compressor (40), the gas ammonia door (22) of the first ammonia storage tank (20), the gas phase isolation door of the tank car (50), and the second ammonia storage tank (30) ) of the liquid ammonia door (23) and the liquid phase isolation door of the tank car (50) to discharge the ammonia liquid inside the tank car (50) to the inside of the second ammonia storage tank (30); Step 4: After the ammonia unloading work is completed, the regulating door of the first liquid ammonia evaporator (10), the gas ammonia door (22) of the first ammonia storage tank (20), and the liquid ammonia of the second ammonia storage tank (30) are closed in sequence. The ammonia door (23), the gas phase isolation door of the tank car (50), the liquid phase isolation door of the tank car (50), and the bypass door of the ammonia unloading compressor (40). 2. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 1, characterized in that it comprises a tank car (50), and a first ammonia unloading device connected to the tank car (50) through a pipeline A storage tank (20) and a second ammonia storage tank (30), the first ammonia storage tank (20) is connected with a first liquid ammonia vaporizer (10) through a pipeline, and the second ammonia storage tank (30) passes through A second liquid ammonia evaporator (60) is connected to the pipeline, the first ammonia storage tank (20) and the second ammonia storage tank (30) have the same structure, and the first ammonia storage tank (20) includes a tank body ( 21), and the gas ammonia door (22), the liquid ammonia door (23) and the pressure regulating door (24) installed at the top of the tank body (21), the outside of the tank body (21) is provided with a thermal insulation layer ( 27), a heat preservation mechanism (25) is provided on the outside of the heat preservation layer (27). 3. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 2, characterized in that the heat preservation mechanism (25) comprises a heat preservation jacket (25) sleeved on the outer surface of the heat preservation layer (27). 251), an air intake assembly (252) provided at the bottom of one end of the heat insulating sleeve (251), and an air intake assembly (252) disposed inside the heat insulating sleeve (251) and connected to the input end of the air intake assembly (252) air outlet assembly (253). 4. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 3, wherein the air intake assembly (252) comprises an air outlet end with the first liquid ammonia evaporator (10) The connected first air intake pipe (2521), the first three-way pipe (2522) connected to the air outlet end of the first air intake pipe (2521), and the air outlet of the first three-way pipe (2522) Two second air intake pipes (2523) are connected at the ends, and one end of the second air intake pipe (2523) away from the first three-way pipe (2522) extends to the interior of the thermal insulation jacket (251). 5. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 4, characterized in that the gas outlet assembly (253) comprises and extends from the second gas inlet pipe (2523) to the insulation jacket (251) The air pipe (2531) connected to one end of the inner part is sequentially installed on the first filter plates (2532) on the outer surfaces of both sides of the insulation layer (27) from top to bottom; A second filter plate (2533) between the first filter plates (2532) and installed on the inner wall surface of the heat preservation jacket (251). 6. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 5, characterized in that, a plurality of gas outlet heads (2534) are sequentially installed on the top of the gas transmission pipe (2531), and a plurality of the The air outlet head (2534) is tilted. 7 . The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 5 , wherein the heat preservation mechanism ( 25 ) further comprises a return gas assembly ( 254 ), and the return gas assembly ( 254 ) It includes a return air hood (2541) installed on the top of the thermal insulation layer (27) and arranged symmetrically, a first return air pipe (2542) connected to the top of the air return hood (2541), and two A second three-way pipe (2543) is connected to one end of the first air return pipe (2542) away from the air return hood (2541), and the air outlet end of the second three-way pipe (2543) is connected with a second air return pipe (2544). ). 8 . The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 7 , wherein the longitudinal section of the air return hood ( 2541 ) is trapezoidal. 9 . 9 . The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 7 , wherein the gas return component ( 254 ) further comprises a gas outlet end in phase with the second gas return pipe ( 2544 ). 10 . A connected fan (2545), the outlet end of the fan (2545) is connected with a third air return pipe (2546), and the end of the third air return pipe (2546) away from the fan (2545) is connected with the first air inlet The trachea (2521) is connected. The ammonia unloading device of the ammonia storage tank differential pressure unloading method according to claim 9, characterized in that, a check valve (2547) is connected to the shell of the third gas return pipe (2546).

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