Liquid ammonia metering device

Abstract

The utility model relates to a kind of liquid ammonia meterable conveying devices, it includes: industrial ammonia storage tank, the industrial ammonia storage tank has industrial gas phase mouth and industrial liquid phase mouth;Vehicle-mounted liquid ammonia tank, the vehicle-mounted liquid ammonia tank has vehicle-mounted gas phase mouth and vehicle-mounted liquid phase mouth;Liquid ammonia delivery component, the liquid ammonia delivery component includes one end with the industrial liquid phase mouth is connected and the other end with the vehicle-mounted liquid phase mouth is connected liquid ammonia delivery pipe, liquid ammonia pump is installed on the liquid ammonia delivery pipe, pressure transmitter one is installed on the liquid ammonia delivery pipe and located in the liquid ammonia pump upstream, pressure transmitter three is installed on the liquid ammonia delivery pipe and located in the liquid ammonia pump downstream, check valve is installed on the liquid ammonia delivery pipe and located between the liquid ammonia pump and the pressure transmitter three and flowmeter is installed on the liquid ammonia delivery pipe and located between the check valve and the pressure transmitter three.Thus can improve filling efficiency, and liquid ammonia utilization is higher.

Description

Technical Field

[0001] This utility model belongs to the technical field of ammonia addition equipment, specifically relating to a liquid ammonia metering and conveying device. Background Technology

[0002] Liquid ammonia (NH3) is a colorless liquid formed by liquefying gaseous ammonia (NH3) under pressure or cooling. Its density is 0.617 g / cm³ (liquid state), its relative density (air=1) is 0.59, and its boiling point is -33.5℃. It forms colorless crystals below -77.7℃. Liquid ammonia is readily soluble in water, reaching a solubility of 34% at 20℃, and dissolves in water to form an alkaline solution (ammonium hydroxide). Furthermore, liquid ammonia vaporizes very easily; its vapor density is lower than air, and it easily rises and diffuses upon leakage. Currently, liquid ammonia is mainly used as a liquid nitrogen fertilizer in agriculture, and also has some applications in the industrial sector. Simultaneously, due to its energy and energy storage properties, ammonia has great development potential in new markets such as power fuels, clean electricity, and hydrogen storage carriers, and the application of liquid ammonia is expanding into the energy field.

[0003] In the field of new energy, ammonia's energy and storage properties give it great development potential in new markets such as power fuels, clean electricity, and hydrogen storage carriers. my country's liquid ammonia industry will build an ammonia energy system, which is of great significance to the development of a low-carbon society. On the one hand, ammonia can be used directly for energy supply, and it is considered to have decarbonization application potential in power generation and heavy transportation; on the other hand, ammonia can be used indirectly for energy supply as a storage and transportation carrier.

[0004] Based on the development and potential of ammonia energy applications, ammonia storage and transportation systems, characterized by safety, reliability, continuity, and low energy consumption, will usher in new development opportunities. This places higher demands on the refueling process during ammonia storage and transportation. Existing liquid ammonia refueling systems are structurally complex and have excessively high time costs during operation. Therefore, a novel metering and conveying device for liquid ammonia is needed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a liquid ammonia metering and conveying device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a liquid ammonia metering and conveying device, which includes:

[0007] An industrial ammonia storage tank, wherein the industrial ammonia storage tank has an industrial gas phase inlet and an industrial liquid phase inlet;

[0008] A vehicle-mounted liquid ammonia tank, wherein the vehicle-mounted liquid ammonia tank has a vehicle-mounted gas phase inlet and a vehicle-mounted liquid phase inlet;

[0009] A liquid ammonia delivery assembly includes a liquid ammonia delivery pipe with one end connected to the industrial liquid phase port and the other end connected to the vehicle-mounted liquid phase port, a liquid ammonia pump installed on the liquid ammonia delivery pipe, a pressure transmitter I installed on the liquid ammonia delivery pipe and located upstream of the liquid ammonia pump, a pressure transmitter III installed on the liquid ammonia delivery pipe and located downstream of the liquid ammonia pump, a check valve installed on the liquid ammonia delivery pipe and located between the liquid ammonia pump and the pressure transmitter III, and a flow meter installed on the liquid ammonia delivery pipe and located between the check valve and the pressure transmitter III.

[0010] Ideally, both ends of the liquid ammonia delivery pipe are connected to the industrial liquid phase port and the vehicle-mounted liquid phase port via quick-connect fittings.

[0011] Furthermore, the liquid ammonia delivery assembly also includes a pressure transmitter II installed on the liquid ammonia delivery pipe and located between the liquid ammonia pump and the check valve.

[0012] Furthermore, the protection mechanism includes a protection branch pipe with both ends connected to the liquid ammonia delivery pipe, one end located upstream of the pressure transmitter and the other end located downstream of the pressure transmitter, and solenoid valves one and two installed on the protection branch pipe.

[0013] Furthermore, it also includes:

[0014] The air extraction mechanism includes at least a vent pipe with one end connected to the industrial gas port and the other end connected to the vehicle-mounted gas port, and a solenoid valve installed on the vent pipe.

[0015] Furthermore, the air extraction mechanism also includes an air extraction branch pipe connected at one end to the air vent pipe, a dissolving water tank connected at the other end of the air extraction branch pipe, a solenoid valve four installed on the air extraction branch pipe, and a vacuum pump installed on the air extraction branch pipe and located between the dissolving water tank and the solenoid valve four.

[0016] Furthermore, it also includes controllers that are connected to the liquid ammonia pump, solenoid valve one, solenoid valve two, solenoid valve three, solenoid valve four, pressure transmitter one, pressure transmitter two, pressure transmitter three, flow meter and vacuum pump respectively for automated control.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The liquid ammonia metering and conveying device of this utility model, by installing a liquid ammonia conveying component with a specific structure between the industrial ammonia storage tank and the vehicle-mounted liquid ammonia tank, can control the amount of liquid ammonia added, eliminating the need for traditional weighing methods or whole-tank filling, thus improving filling efficiency and increasing the utilization rate of liquid ammonia; it has a simple structure, low component cost, and strong operability; when preferably used in conjunction with a controller, it reduces the risk of personnel operation and further ensures the safety of liquid ammonia filling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the liquid ammonia metering and conveying device of this utility model;

[0019] Figure 2 This is the control circuit diagram of the liquid ammonia metering and conveying device of this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] like Figure 1 The liquid ammonia metering and conveying device shown mainly includes an industrial ammonia storage tank 1, a vehicle-mounted liquid ammonia tank 2, and a liquid ammonia conveying assembly 3.

[0022] The industrial ammonia storage tank 1 has an industrial gas phase port 11 and an industrial liquid phase port 12. Valves are usually installed at the industrial gas phase port 11 and the industrial liquid phase port 12 to control the opening and closing of the industrial gas phase port 11 and the industrial liquid phase port 12 (existing conventional valves, such as automatic control valves, can be used).

[0023] The vehicle-mounted liquid ammonia tank 2 also has a vehicle-mounted gas phase port 21 and a vehicle-mounted liquid phase port 22. Valves are usually installed at the vehicle-mounted gas phase port 21 and the vehicle-mounted liquid phase port 22 to control the opening and closing of the vehicle-mounted gas phase port 21 and the vehicle-mounted liquid phase port 22 (existing conventional ones can be used, such as automatic control valves).

[0024] The liquid ammonia delivery assembly 3 includes a liquid ammonia delivery pipe 31 connected at one end to an industrial liquid phase port 12 and at the other end to an on-board liquid phase port 22, a liquid ammonia pump 32 (which has a motor and a motor controller) installed on the liquid ammonia delivery pipe 31, a pressure transmitter 33 installed on the liquid ammonia delivery pipe 31 and located upstream of the liquid ammonia pump 32 (the definitions of upstream and downstream in this application are based on the flow direction of liquid ammonia in the liquid ammonia delivery pipe 31), a pressure transmitter 37 installed on the liquid ammonia delivery pipe 31 and located downstream of the liquid ammonia pump 32, a check valve 34 installed on the liquid ammonia delivery pipe 31 and located between the liquid ammonia pump 32 and the pressure transmitter 37, and a flow meter 36 installed on the liquid ammonia delivery pipe 31 and located between the check valve 34 and the pressure transmitter 37.

[0025] In this embodiment, the two ends of the liquid ammonia delivery pipe 31 are connected to the industrial liquid phase port 12 and the vehicle-mounted liquid phase port 22 respectively via commercially available conventional quick-connect fittings 30. The liquid ammonia delivery assembly 3 also includes a pressure transmitter 35 installed on the liquid ammonia delivery pipe 31 and located between the liquid ammonia pump 32 and the check valve 34. The liquid ammonia metering delivery device also includes a protection mechanism 4, which includes a protection branch pipe 41 with both ends connected to the liquid ammonia delivery pipe 31, one end located upstream of the pressure transmitter 33 and the other end located downstream of the pressure transmitter 37, and solenoid valves 42 and 43 installed on the protection branch pipe 41. The liquid ammonia metering delivery device also includes a venting mechanism 5, which includes at least a vent pipe 51 with one end connected to the industrial gas phase port 11 and the other end connected to the vehicle-mounted gas phase port 21, and a solenoid valve 52 installed on the vent pipe 51.

[0026] In this embodiment, the air extraction mechanism 5 further includes an air extraction branch pipe 53 connected at one end to the air vent pipe 51, a dissolving water tank 56 connected at the other end of the air extraction branch pipe 53, a solenoid valve 54 installed on the air extraction branch pipe 53, and a vacuum pump 55 installed on the air extraction branch pipe 53 and located between the dissolving water tank 56 and the solenoid valve 54.

[0027] The liquid ammonia metering and delivery device also includes a controller 6 that is connected to the liquid ammonia pump 32, solenoid valve 42, solenoid valve 43, solenoid valve 52, solenoid valve 54, pressure transmitter 33, pressure transmitter 35, pressure transmitter 37, flow meter 36, and vacuum pump 55 for automated control. Its circuit structure is as follows: Figure 2 As shown.

[0028] The working principle of the above-mentioned liquid ammonia metering and conveying device is roughly as follows:

[0029] During the refueling (liquid ammonia) operation, the liquid ammonia pump 32 is connected to the industrial liquid phase port 12 of the industrial liquid ammonia tank 1 through one end of the liquid ammonia delivery pipe 31 and to the vehicle liquid phase port 22 of the vehicle-mounted liquid ammonia tank 2 through the other end of the liquid ammonia delivery pipe 31. A vent pipe 51 is used to connect the industrial gas phase port 11 of the industrial liquid ammonia tank 1 to the vehicle gas phase port 21 of the vehicle-mounted liquid ammonia tank 2 for later use.

[0030] Open the on-board liquid phase port 22 of the vehicle-mounted liquid ammonia tank 2 and the industrial liquid phase port 12 of the industrial liquid ammonia tank 1. The controller 6 collects the pressure values ​​of the industrial liquid phase port 12 of the industrial liquid ammonia tank 1 and the on-board liquid phase port 22 of the vehicle-mounted liquid ammonia tank 2 through pressure transmitter 1 33 and pressure transmitter 3 37 respectively. When the pressure difference between the industrial liquid phase port 12 of the industrial liquid ammonia tank 1 and the on-board liquid phase port 22 of the vehicle-mounted liquid ammonia tank 2 is less than the pressure limit of the pressure protection structure of the liquid ammonia pump 32, the controller 6 sends a command to the motor controller, thereby causing the motor to drive the liquid ammonia pump 32 to work. Based on the pressure monitoring at both ends of the liquid ammonia pump 32, the controller controls the working status of the liquid ammonia pump 32 in real time to ensure that the liquid ammonia filling operation is carried out smoothly and efficiently.

[0031] When the pressure difference between the industrial liquid phase port 12 of industrial liquid ammonia tank 1 and the on-board liquid phase port 22 of vehicle-mounted liquid ammonia tank 2 exceeds the pressure limit of the pressure protection structure of liquid ammonia pump 32, controller 6 controls solenoid valve 3 52 to open, ensuring that the pressures of industrial liquid ammonia tank 1 and vehicle-mounted liquid ammonia tank 2 are close to pressure balance through the industrial gas phase port 11 of industrial liquid ammonia tank 1 and the on-board gas phase port 21 of vehicle-mounted liquid ammonia tank 2. When the pressure is close to balance, controller 6 controls solenoid valve 3 52 to close to minimize ammonia loss and ensure metering accuracy.

[0032] During liquid ammonia refueling, a check valve 34 is installed downstream of the liquid ammonia pump 32 to prevent backflow of liquid ammonia and ensure the accuracy of the flow rate data of the liquid ammonia flowing through the flow meter 36. The flow meter data is recorded in real time and fed back to the controller 6 for liquid ammonia refueling measurement. The amount of liquid ammonia refueling can be accurately controlled through the flow meter 36 measurement. At the same time, a pressure transmitter 35 is also installed to monitor the outlet pressure data of the liquid ammonia pump 32 and feed it back to the controller 6 in real time to monitor whether the liquid ammonia pump 32 is operating normally.

[0033] After the liquid ammonia filling operation is completed, controller 6 issues a command to stop the liquid ammonia pump 32, and simultaneously closes the industrial gas phase port 11 and industrial liquid phase port 12 of industrial liquid ammonia tank 1, and the vehicle-mounted gas phase port 21 and vehicle-mounted liquid phase port 22 of vehicle-mounted liquid ammonia tank 2. After the above operations are completed, controller 6 controls the opening of solenoid valves 1, 2, 3, and 4, ensuring they are all in the open state. Then, controller 6 controls the opening of vacuum pump 55 to draw the liquid ammonia and ammonia gas from the pipeline into the dissolution tank 56, ensuring that the residual ammonia concentration in the pipeline reaches a safe level and guaranteeing safety.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A meterable liquid ammonia conveying device, characterized in that, It includes: An industrial ammonia storage tank (1) has an industrial gas phase inlet (11) and an industrial liquid phase inlet (12). The vehicle-mounted liquid ammonia tank (2) has a vehicle-mounted gas phase port (21) and a vehicle-mounted liquid phase port (22). A liquid ammonia delivery assembly (3) includes a liquid ammonia delivery pipe (31) with one end connected to the industrial liquid phase port (12) and the other end connected to the vehicle-mounted liquid phase port (22), a liquid ammonia pump (32) installed on the liquid ammonia delivery pipe (31), a pressure transmitter one (33) installed on the liquid ammonia delivery pipe (31) and located upstream of the liquid ammonia pump (32), a pressure transmitter three (37) installed on the liquid ammonia delivery pipe (31) and located downstream of the liquid ammonia pump (32), a check valve (34) installed on the liquid ammonia delivery pipe (31) and located between the liquid ammonia pump (32) and the pressure transmitter three (37), and a flow meter (36) installed on the liquid ammonia delivery pipe (31) and located between the check valve (34) and the pressure transmitter three (37).

2. The liquid ammonia metering and conveying device according to claim 1, characterized in that: The two ends of the liquid ammonia delivery pipe (31) are connected to the industrial liquid phase port (12) and the vehicle-mounted liquid phase port (22) respectively via quick-connect fittings (30).

3. The liquid ammonia metering and conveying device according to claim 1 or 2, characterized in that: The liquid ammonia delivery assembly (3) also includes a pressure transmitter (35) installed on the liquid ammonia delivery pipe (31) and located between the liquid ammonia pump (32) and the check valve (34).

4. The liquid ammonia metering and conveying device according to claim 3, characterized in that, It also includes: The protection mechanism (4) includes a protection branch pipe (41) with both ends connected to the liquid ammonia delivery pipe (31), one end located upstream of the pressure transmitter (33) and the other end located downstream of the pressure transmitter (37), and a solenoid valve (42) and a solenoid valve (43) installed on the protection branch pipe (41).

5. The liquid ammonia metering and conveying device according to claim 4, characterized in that, It also includes: The air extraction mechanism (5) includes at least a vent pipe (51) with one end connected to the industrial gas port (11) and the other end connected to the vehicle gas port (21) and a solenoid valve (52) installed on the vent pipe (51).

6. The liquid ammonia metering and conveying device according to claim 5, characterized in that: The air extraction mechanism (5) further includes an air extraction branch pipe (53) connected at one end to the air pipe (51), a dissolving water tank (56) connected at the other end of the air extraction branch pipe (53), a solenoid valve four (54) installed on the air extraction branch pipe (53), and a vacuum pump (55) installed on the air extraction branch pipe (53) and located between the dissolving water tank (56) and the solenoid valve four (54).

7. The liquid ammonia metering and conveying device according to claim 6, characterized in that: It also includes a controller (6) that is connected to the liquid ammonia pump (32), solenoid valve one (42), solenoid valve two (43), solenoid valve three (52), solenoid valve four (54), pressure transmitter one (33), pressure transmitter two (35), pressure transmitter three (37), flow meter (36) and vacuum pump (55) for automated control.

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