CN108224829B - Liquid ammonia delivery system and liquid ammonia delivery method - Google Patents
Liquid ammonia delivery system and liquid ammonia delivery method Download PDFInfo
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- CN108224829B CN108224829B CN201611156454.3A CN201611156454A CN108224829B CN 108224829 B CN108224829 B CN 108224829B CN 201611156454 A CN201611156454 A CN 201611156454A CN 108224829 B CN108224829 B CN 108224829B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The invention discloses a liquid ammonia conveying system and a liquid ammonia conveying method. The liquid ammonia conveying system comprises at least two liquid ammonia storage tanks, a gas ammonia compression device, a liquid ammonia conveying power device and a liquid ammonia conveying pipeline connected with the liquid ammonia conveying power device in parallel. The liquid ammonia conveying system and the liquid ammonia conveying method can ensure continuous liquid ammonia conveying when the liquid ammonia conveying power device fails or energy consumption needs to be reduced, and can reduce the cost of liquid ammonia conveying.
Description
Technical Field
The invention belongs to the technical field of fluid delivery, and particularly relates to a liquid ammonia delivery system and a liquid ammonia delivery method.
Background
Liquid ammonia is an important chemical raw material and can be used as a refrigerant for a freezing station. The liquid ammonia is unloaded and conveyed from the tank wagon into a liquid ammonia storage tank by a compressor, a pump or other power; then the liquid ammonia is transported to the user through the power equipment.
At present, a common method for transporting liquid ammonia in a factory is to transport liquid ammonia to a downstream user by using power equipment, such as a screw pump, a reciprocating pump, a canned motor pump or the like, and specifically, is a liquid ammonia transporting system shown in fig. 1. It includes liquid ammonia storage tank 1, liquid ammonia pump 2, mass flow meter 3 and liquid ammonia trip valve 4, is equipped with liquid ammonia discharge port 5 on the liquid ammonia storage tank 1, and liquid ammonia discharge port 5 passes through the pipeline and communicates with liquid ammonia pump 2, is equipped with mass flow meter 3 and liquid ammonia trip valve 4 on the pipeline that 2 export liquid ammonia of liquid ammonia pump were sent outward. The device is characterized in that a pressurizing port is arranged on the liquid ammonia storage tank 1, the pressurizing port is connected with a self-pressurizing device 6, and a gas ammonia outlet 7 is arranged on the liquid ammonia storage tank 1.
Although the existing liquid ammonia delivery system can complete liquid ammonia delivery according to the requirements of downstream users, the delivery capacity is large, the delivery rate is ensured, and the application range is wide. However, this method has the following problems:
1. because of the problems of the power conveying devices such as the liquid ammonia pump 2 and the like, the gas ammonia in the inlet pipeline of the liquid ammonia pump 2 and the pump must be discharged before each conveying to avoid the cavitation phenomenon, however, because of the volatile property of the liquid ammonia, the residual gas ammonia in the corresponding pipeline can enter the air, which not only causes the waste of raw material cost, but also causes environmental pollution;
2. because a factory generally operates continuously, the power delivery devices such as the liquid ammonia pump 2 and the like are easy to break down and stop in long-term continuous operation, so that other working systems supplied by the liquid ammonia delivery system cannot be stopped, and the interlocking shutdown phenomenon is easy to cause, thereby causing huge loss;
3. the spare parts of the power conveying devices such as the liquid ammonia pump 2 and the like have higher consumption cost and higher direct power consumption, and the cost of the liquid ammonia conveying cost is directly increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a liquid ammonia conveying method to solve the technical problems that the conventional power liquid ammonia conveying method needs to rely on a power device for conveying and has high cost.
Another objective of the present invention is to provide a liquid ammonia delivery system, so as to solve the technical problem that the existing liquid ammonia delivery system must implement liquid ammonia delivery by using a power device.
In order to achieve the above object, according to one aspect of the present invention, there is provided a liquid ammonia transfer method. The liquid ammonia conveying method comprises the following steps:
only opening a gas-phase outlet valve arranged at the top of a first liquid ammonia storage tank, enabling gas-phase ammonia in the first liquid ammonia storage tank to enter a gas ammonia compression device, and starting the gas ammonia compression device to compress and pressurize the introduced gas-phase ammonia;
opening a reflux valve arranged at a compressed gas ammonia outlet of the gas ammonia compression device and only opening a gas-phase reflux valve arranged in a second liquid ammonia storage tank, so that the compressed gas-phase ammonia flows back to the second liquid ammonia storage tank through the reflux valve of the gas ammonia compression device and the gas-phase reflux valve of the second liquid ammonia storage tank;
and after the gas phase pressure in the second liquid ammonia storage tank reaches a preset value, opening a liquid ammonia delivery valve arranged at the bottom of the second liquid ammonia storage tank and a liquid ammonia delivery valve arranged on a liquid ammonia delivery header pipe, so that the liquid ammonia in the second liquid ammonia storage tank is directly delivered under the action of the air pressure in the second liquid ammonia storage tank.
In another aspect of the invention, a liquid ammonia delivery system is provided. The liquid ammonia delivery system comprises:
the device comprises at least two liquid ammonia storage tanks, a gas phase reflux valve, a gas phase outlet valve, an ammonia feeding valve and an ammonia feeding valve, wherein each liquid ammonia storage tank is provided with the gas phase reflux valve, the top of each liquid ammonia storage tank is provided with the gas phase outlet valve, and the bottom of each liquid ammonia storage tank is provided with the ammonia feeding valve and;
a return valve is connected to a compressed gas outlet of the gas ammonia compression device, the return valve of the gas ammonia compression device is respectively communicated with a gas phase return valve of the liquid ammonia storage tank through a pipeline, and a gas ammonia inlet of the gas ammonia compression device is respectively communicated with a gas phase outlet valve of the liquid ammonia storage tank;
the ammonia delivery valves arranged at the bottom of the liquid ammonia storage tank are communicated with the liquid inlet of the liquid ammonia delivery power device through pipelines; a liquid inlet valve is arranged on a pipeline near a liquid inlet of the liquid ammonia conveying power device, and a liquid outlet valve is arranged on a pipeline near a liquid outlet; feed liquor valve deviate from power device one end is carried to liquid ammonia with it deviates from to go out the liquid valve still direct intercommunication have with the parallelly connected liquid ammonia pipeline of power device is carried to liquid ammonia between the one end of power device is carried to liquid ammonia, just still be equipped with the delivery valve on the liquid ammonia pipeline.
Compared with the prior art, the liquid ammonia conveying method has the advantages that gas-phase ammonia in one liquid ammonia storage tank is pressed into the other liquid ammonia storage tank through the gas ammonia compression device, the liquid ammonia is directly conveyed out by utilizing the air pressure in the other liquid ammonia storage tank, and the liquid ammonia can be directly conveyed to a downstream production unit under the condition of not providing a liquid ammonia conveying power device.
The liquid ammonia conveying system disclosed by the invention has the common effects of at least two liquid ammonia storage tanks, the valves, the liquid ammonia conveying power device and the liquid ammonia conveying pipeline provided with the conveying valves, so that continuous liquid ammonia conveying can be ensured when the liquid ammonia conveying power device fails or the energy consumption needs to be reduced, and the cost for conveying liquid ammonia can be reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art liquid ammonia delivery system;
fig. 2 is a schematic structural diagram of a liquid ammonia delivery system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In one aspect, embodiments of the present invention provide a method for liquid ammonia delivery. With reference to the diagram of the liquid ammonia delivery system described in fig. 2, the liquid ammonia delivery method includes the following steps:
s01: only opening a gas-phase outlet valve 31 arranged at the top of the first liquid ammonia storage tank 30, so that gas-phase ammonia in the first liquid ammonia storage tank 31 enters the gas ammonia compression device 20, and starting the gas ammonia compression device 20 to compress and pressurize the introduced gas-phase ammonia;
s02: opening a reflux valve 21 arranged at a compressed gas ammonia outlet of the gas ammonia compression device 20 and only opening a gas phase reflux valve 42 arranged in a second liquid ammonia storage tank 40, so that the compressed gas phase ammonia flows back to the second liquid ammonia storage tank 40 through the reflux valve 21 of the gas ammonia compression device 20 and the gas phase reflux valve 42 of the second liquid ammonia storage tank 40;
s03: after the gas phase pressure in the second liquid ammonia storage tank 40 reaches a predetermined value, the ammonia delivery valve 43 arranged at the bottom of the delivery valve 83 and the second liquid ammonia storage tank 40 and the liquid ammonia delivery valve arranged on the liquid ammonia delivery header pipe are opened, so that the liquid ammonia in the second liquid ammonia storage tank 40 bypasses the liquid ammonia delivery power device 80 under the action of the gas pressure in the second liquid ammonia storage tank and directly passes through the delivery valve 83 for delivery.
In step S01, the first liquid ammonia storage tank 30 in step S01 and the second liquid ammonia storage tank 40 in step S02 are replaced in operation, for example, a gas phase outlet valve 41 is installed on the top of the second liquid ammonia storage tank 40, so that the gas phase ammonia enters the gas ammonia compression device 20, and then the compressed gas phase ammonia flows back to the first liquid ammonia storage tank 30 through the return valve 21 and the gas phase return valve 32 of the first liquid ammonia storage tank 30.
In addition, the liquid level of the liquid ammonia in the liquid ammonia storage tank has certain requirements, the volume is generally controlled to be 30-60%, and when the liquid level of the spherical tank is lower than 30%, the liquid ammonia is not allowed to be delivered; when the liquid level is higher than 60%, ammonia discharge is not allowed; when the liquid level is 40-60, the evaporation capacity of the liquid ammonia is stable and reliable.
In one embodiment, the first liquid ammonia storage tank 30 and the second liquid ammonia storage tank 40 are each provided with a safety valve (not shown in fig. 2), and when the gas pressure in the first liquid ammonia storage tank 30 and the second liquid ammonia storage tank 40 is too high due to factors such as external temperature, for example, when the gas pressure in the tanks is too high, for example, the gas pressure is greater than 1.62MPa, the safety valves will jump, so that the gas-phase ammonia is led out through an outlet of the safety valve, led into the ammonia storage refrigerator device 70 through the gas valve 36 and the gas valve 46 for liquefaction, and the liquid ammonia formed after the liquefaction is returned into the first liquid ammonia storage tank 30 through the recovery valve 34 and/or the recovery valve 44 flows into the second liquid ammonia storage tank 40.
In step S01, when the gas-phase outlet valve 31 installed on the top of the first liquid ammonia storage tank 30 is opened, other valves connected to the first liquid ammonia storage tank 30 should be closed to ensure that the gas-phase ammonia in the first liquid ammonia storage tank 30 enters the gas-ammonia compression device 20 to be compressed.
In step S02, when the reflux valve 21 installed at the compressed gas ammonia outlet of the gas ammonia compressor 20 is opened, the gas outlet valve 22 installed at the compressed gas ammonia outlet of the gas ammonia compressor 20 as shown in fig. 2 should be closed to ensure that the compressed gas-phase ammonia enters the second liquid ammonia storage tank 40, and the second liquid ammonia storage tank 40 is pressurized. When the gas phase return valve 42 provided in the second liquid ammonia storage tank 40 is opened, other valves connected to the second liquid ammonia storage tank 40 should be closed to ensure that the gas pressure in the second liquid ammonia storage tank 40 is continuously increased to a predetermined value.
In the above step S03, the delivery valve 83 is installed between the end of the liquid ammonia delivery power device 80 deviating from the liquid inlet valve 81 and the end of the liquid outlet valve 82 deviating from the liquid ammonia delivery power device 80 through a pipeline. When liquid ammonia is delivered outwards, the liquid outlet valve 82 and the liquid inlet valve 81 are closed, liquid ammonia is prevented from flowing through the liquid ammonia delivery power device 80, the liquid ammonia is directly delivered outwards through the delivery pipeline 84 which is connected with the liquid ammonia delivery power device 80 in parallel and provided with the delivery valve 83, the continuity of liquid ammonia delivery is guaranteed, and therefore the normal work of a downstream production unit is guaranteed, the liquid ammonia delivery power device 80 is effectively prevented from stopping liquid ammonia delivery and stopping down-stream industry due to failure, energy consumption is reduced, and the liquid ammonia delivery cost is reduced.
In one embodiment, the predetermined value of the pressure in the second liquid ammonia storage tank 40 is less than the safety pressure of the safety valve installed in the first liquid ammonia storage tank 30 or the second liquid ammonia storage tank 40. As in the specific embodiment, the predetermined value is 0.95 MPa. The pressure is slightly larger than the required pressure of 0.8MPa of the delivery pipeline, so that the safety of the whole liquid ammonia delivery system is ensured.
In addition, the liquid ammonia delivery method also comprises a liquid ammonia unloading method:
an air outlet valve 22 arranged at the compressed gas ammonia outlet of the gas ammonia compression device 20 is connected with an air inlet of the liquid ammonia tank wagon 10, and an ammonia inlet of the second liquid ammonia storage tank 40 is connected with a liquid outlet of the liquid ammonia tank wagon 10; then opening the gas phase outlet valve 31 of the first liquid ammonia storage tank 30, the gas inlet valve arranged at the inlet of the gas ammonia compression device 20 and the gas outlet valve 22 arranged at the outlet, and closing the reflux valve 21 arranged at the compressed gas ammonia outlet of the gas ammonia compression device 20; then, the gas ammonia compression device 20 is started to compress and pressurize the gas-phase ammonia flowing out from the first liquid ammonia storage tank 30, the outlet pressure of the gas ammonia compression device is adjusted and controlled through the air outlet valve 22, the gas ammonia is pressed into the liquid ammonia tank wagon 10 through a pipeline connecting the air outlet valve 22 with the liquid ammonia tank wagon, the pressure inside the liquid ammonia tank wagon 10 is increased, and the liquid ammonia inside the liquid ammonia tank wagon is pressed into the second liquid ammonia storage tank 40 through the liquid discharge valve 45 under the action of the pressure inside the liquid ammonia tank wagon 10.
In the liquid ammonia unloading method, the first liquid ammonia storage tank 30 and the second liquid ammonia storage tank 40 can be exchanged, for example, the gas phase ammonia in the second liquid ammonia storage tank 40 is pressed into the liquid ammonia tank car 10 through the gas ammonia compression device 20, and then the liquid ammonia in the liquid ammonia tank car 10 is pressed into the first liquid ammonia storage tank 40.
Therefore, the ammonia delivery method can bypass the liquid ammonia delivery power device 80 and directly deliver the liquid ammonia to the downstream production unit, thereby ensuring the continuous delivery of the liquid ammonia by the liquid ammonia delivery system and the continuous production of the liquid ammonia downstream production unit, and effectively avoiding the technical problems of easy shutdown, high energy consumption and high cost of the conventional liquid ammonia delivery method which needs to rely on the liquid ammonia delivery power device 80.
Correspondingly, the embodiment of the invention also provides a liquid ammonia delivery system for realizing the liquid ammonia delivery method. The connection network of the liquid ammonia delivery system is shown in fig. 2, and comprises the following devices: at least two liquid ammonia storage tanks, a gas ammonia compression device 20, and a liquid ammonia delivery power device 80.
The at least two liquid ammonia storage tanks are four liquid ammonia storage tanks, such as a liquid ammonia storage tank 30, a liquid ammonia storage tank 40, a liquid ammonia storage tank 50, and a liquid ammonia storage tank 60 in fig. 2. Of course, 3 liquid ammonia storage tanks may be provided, or 5 or more liquid ammonia storage tanks may be provided. Each liquid ammonia storage tank is provided with a gas phase reflux valve, a safety valve, a gas phase outlet valve arranged at the top, an ammonia feeding valve and an ammonia feeding valve arranged at the bottom, and the like, and specifically, the liquid ammonia storage tank 30 is provided with a gas phase outlet valve 31, a reflux valve 32, a safety valve, an ammonia feeding valve 33, a recovery valve 34 and an ammonia feeding valve 35 arranged at the top; similarly, the liquid ammonia storage tank 40 is provided with a gas phase outlet valve 41, a reflux valve 42, a safety valve at the top, an ammonia feed valve 43 and a recovery valve 44 at the bottom, and an ammonia inlet valve 45. As shown in FIG. 2, the gas phase outlet valve 41, the reflux valve 42, the safety valve, the ammonia feed valve 43 and the recovery valve 44 provided at the bottom, and the ammonia feed valve 45 are all provided in parallel. In addition, in order to effectively control the gas phase ammonia led out from the safety valve to be smoothly led into the ammonia holding refrigerator device 70 for liquefaction treatment, valves, such as the valve 36 and the valve 46 in fig. 2, are further provided on the pipe communicating with the safety valve.
In one embodiment, the liquid outlet of the ammonia refrigerator device 70 is connected to a recovery valve (e.g., gas phase outlet valve 34, 44) provided in each of the liquid ammonia storage tanks (e.g., 30, 40, 50, 60) through a pipe. That is to say, the liquefied ammonia that is liquefied in the ice machine device 70 through protecting ammonia can flow back to in the liquid ammonia storage tank through every recovery valve that the liquid ammonia storage tank was installed, avoid polluting the environment and reduce the loss of liquid ammonia.
The compressed gas outlet of the gas ammonia compression device 20 is connected with a reflux valve 21, the reflux valve 21 of the gas ammonia compression device 20 is respectively communicated with the gas phase reflux valves (such as reflux valves 32 and 42) of the liquid ammonia storage tanks (30, 40, 50 and 60) through pipelines, and the gas ammonia inlet of the gas ammonia compression device 20 is respectively communicated with the gas phase outlet valves (such as gas phase outlet valves 31 and 41) of the liquid ammonia storage tanks (30, 40, 50 and 60). In one embodiment, the gaseous ammonia compression device may be a gaseous ammonia compressor. For the operation of unloading the liquid ammonia, a gas outlet valve 22 is further installed at the compressed gas outlet of the gas ammonia compression device 20, and the gas outlet valve 22 of the gas ammonia compression device 20 is connected in parallel with the reflux valve 21.
In the above liquid ammonia delivery power device 80, the ammonia delivery valves (33, 43) installed at the bottoms of the liquid ammonia storage tanks (30, 40, 50, 60) are all communicated with the liquid inlet of the liquid ammonia delivery power device 80 through a pipeline; a liquid inlet valve 81 is arranged on the pipeline near the liquid inlet of the liquid ammonia conveying power device 80, and a liquid outlet valve 82 is arranged on the pipeline near the liquid outlet; feed liquor valve 81 deviate from liquid ammonia transport power device one end with deviate from of liquid valve 82 still direct intercommunication have with the parallelly connected liquid ammonia pipeline 84 of power device 80 is carried to liquid ammonia between the liquid ammonia pipeline 84 still is equipped with delivery valve 83 on the liquid ammonia pipeline 84.
In an embodiment, the liquid ammonia delivery power device may be one of a barrel pump, a screw pump, a shield pump or a reciprocating pump, and provides the delivery power for the liquid ammonia.
In addition, each valve in the liquid ammonia delivery system can be a valve group, and is specifically arranged according to the actual production requirement.
Therefore, the liquid ammonia delivery system can ensure continuous liquid ammonia delivery when the liquid ammonia delivery power device 80 fails or energy consumption needs to be reduced through the public function of the at least two liquid ammonia storage tanks, the valves, the liquid ammonia delivery power device 80 and the liquid ammonia delivery pipeline 84 provided with the delivery valve 83, and the cost of liquid ammonia delivery can be reduced.
In addition, the working principle of the liquid ammonia delivery system is as set forth in the liquid ammonia delivery method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method of liquid ammonia delivery comprising the steps of:
only opening a gas-phase outlet valve arranged at the top of a first liquid ammonia storage tank, enabling gas-phase ammonia in the first liquid ammonia storage tank to enter a gas ammonia compression device, and starting the gas ammonia compression device to compress and pressurize the introduced gas-phase ammonia;
opening a reflux valve arranged at a compressed gas ammonia outlet of the gas ammonia compression device and only opening a gas-phase reflux valve arranged in a second liquid ammonia storage tank, so that the compressed gas-phase ammonia flows back to the second liquid ammonia storage tank through the reflux valve of the gas ammonia compression device and the gas-phase reflux valve of the second liquid ammonia storage tank;
and after the gas phase pressure in the second liquid ammonia storage tank reaches a preset value, opening a liquid ammonia delivery valve arranged at the bottom of the second liquid ammonia storage tank and a liquid ammonia delivery valve arranged on a liquid ammonia delivery header pipe, so that the liquid ammonia in the second liquid ammonia storage tank is directly delivered under the action of the air pressure in the second liquid ammonia storage tank.
2. The method for liquid ammonia delivery according to claim 1, characterized in that: the preset value of the air pressure in the second liquid ammonia storage tank is smaller than the safety pressure borne by a safety valve arranged on the first liquid ammonia storage tank or the second liquid ammonia storage tank.
3. Method for liquid ammonia delivery according to claim 1 or 2, characterized in that: the predetermined value of the gas pressure in the second liquid ammonia storage tank is 0.95 MPa.
4. Method for liquid ammonia delivery according to claim 1 or 2, characterized in that: the method also comprises a liquid ammonia unloading method:
connecting an air outlet valve arranged at a compressed gas ammonia outlet of the gas ammonia compression device with an air inlet of a liquid ammonia tank car, and connecting an ammonia inlet of the second liquid ammonia storage tank with a liquid outlet of the liquid ammonia tank car; then opening the gas phase outlet valve of the first liquid ammonia storage tank and an air inlet valve arranged at a compressed gas ammonia inlet of the gas ammonia compression device, and closing a reflux valve arranged at a compressed gas ammonia outlet of the gas ammonia compression device; then the gas ammonia compression device is started to compress and pressurize the gas-phase ammonia flowing out of the first liquid ammonia storage tank, the gas-phase ammonia is pressed into the liquid ammonia tank car through an air outlet valve of the gas ammonia compression device, so that the pressure in the liquid ammonia tank car is increased, and the liquid ammonia in the liquid ammonia tank car is pressed into the second liquid ammonia storage tank under the action of the pressure in the liquid ammonia tank car.
5. A liquid ammonia delivery system, comprising:
the device comprises at least two liquid ammonia storage tanks, a gas phase reflux valve, a gas phase outlet valve, an ammonia feeding valve and an ammonia feeding valve, wherein each liquid ammonia storage tank is provided with the gas phase reflux valve, the top of each liquid ammonia storage tank is provided with the gas phase outlet valve, and the bottom of each liquid ammonia storage tank is provided with the ammonia feeding valve and;
a return valve is connected to a compressed gas outlet of the gas ammonia compression device, the return valve of the gas ammonia compression device is respectively communicated with a gas phase return valve of the liquid ammonia storage tank through a pipeline, and a gas ammonia inlet of the gas ammonia compression device is respectively communicated with a gas phase outlet valve of the liquid ammonia storage tank;
the ammonia delivery valves arranged at the bottom of the liquid ammonia storage tank are communicated with the liquid inlet of the liquid ammonia delivery power device through pipelines; a liquid inlet valve is arranged on a pipeline near a liquid inlet of the liquid ammonia conveying power device, and a liquid outlet valve is arranged on a pipeline near a liquid outlet; a liquid ammonia conveying pipeline connected in parallel with the liquid ammonia conveying power device is directly communicated between one end of the liquid inlet valve, which is far away from the liquid ammonia conveying power device, and one end of the liquid outlet valve, which is far away from the liquid ammonia conveying power device, and a conveying valve is further arranged on the liquid ammonia conveying pipeline;
only opening a gas-phase outlet valve arranged at the top of a first liquid ammonia storage tank in the two liquid ammonia storage tanks, enabling gas-phase ammonia in the first liquid ammonia storage tank to enter the gas ammonia compression device, and starting the gas ammonia compression device to compress and pressurize the introduced gas-phase ammonia;
opening a reflux valve arranged at a compressed gas ammonia outlet of the gas ammonia compression device and only opening a gas phase reflux valve arranged in a second liquid ammonia storage tank of the two liquid ammonia storage tanks, so that the compressed gas phase ammonia flows back to the second liquid ammonia storage tank through the reflux valve of the gas ammonia compression device and the gas phase reflux valve of the second liquid ammonia storage tank;
and after the gas phase pressure in the second liquid ammonia storage tank reaches a preset value, opening an ammonia delivery valve arranged at the bottom of the second liquid ammonia storage tank and a delivery valve of the liquid ammonia delivery pipeline, so that the liquid ammonia in the second liquid ammonia storage tank is directly delivered under the action of the air pressure in the second liquid ammonia storage tank.
6. The liquid ammonia delivery system of claim 5, wherein: and each liquid ammonia storage tank is also provided with a safety valve at the top, and the safety valves are communicated with the air inlet of the ammonia protection ice machine device through pipelines.
7. The liquid ammonia delivery system of claim 6, wherein: and the liquid outlet of the ammonia ice machine device is communicated with the recovery valve arranged on each liquid ammonia storage tank through a pipeline.
8. The liquid ammonia delivery system of claim 7, wherein: each liquid ammonia storage tank is also provided with a liquid unloading valve, the liquid unloading valve is connected with the recovery valve in parallel, the compressed gas outlet of the gas ammonia compression device is also provided with an air outlet valve, and the air outlet valve of the gas ammonia compression device is connected with the reflux valve of the gas ammonia compression device in parallel.
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| CN112413395B (en) * | 2019-08-22 | 2022-11-04 | 中国石油天然气股份有限公司 | Liquid ammonia conveying system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7044152B2 (en) * | 2003-01-06 | 2006-05-16 | Innovative Environmental Technologies, Inc. | Apparatus for in-situ remediation using a closed delivery system |
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| CN1286213A (en) * | 1999-08-30 | 2001-03-07 | 巴陵石化鹰山石油化工厂 | Method for unloading liquid ammonia from tank truck |
| JP2002013700A (en) * | 2000-06-30 | 2002-01-18 | Iwatani Internatl Corp | Method for detecting completion of liquefied gas transfer |
| JP2004089810A (en) * | 2002-08-30 | 2004-03-25 | Mitsubishi Heavy Ind Ltd | Slurry high pressure conveying apparatus |
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| CN102829329A (en) * | 2012-08-17 | 2012-12-19 | 中国天辰工程有限公司 | Novel method for unloading and delivering liquid ammonia |
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