Liquid ammonia tank container

Abstract

The present invention provides a liquid ammonia tank container, which includes a frame, a tank body, a heating and evaporation system, a gas phase pipeline, a liquid ammonia temperature detector, a heat-carrying liquid temperature detector and a control system. The heating and evaporation system includes a coil for the flow of the heat-carrying liquid, a circulation pump for providing the driving force for the flow of the heat-carrying liquid, and a heater for heating the heat-carrying liquid; the coil is located inside the tank body or wound around the outer wall of the tank body to heat the liquid ammonia in the tank body and convert the liquid ammonia into gaseous ammonia for output; the gas phase pipeline is communicated with the gas phase space of the tank body for outputting gaseous ammonia; the liquid ammonia temperature detector is communicated with the inside of the tank body for detecting the real-time temperature of the liquid ammonia in the tank body; the heat-carrying liquid temperature detector is communicated with the coil for detecting the real-time temperature of the heat-carrying liquid; the control system is electrically connected to the heater, the liquid ammonia temperature detector and the heat-carrying liquid temperature detector respectively, and controls the heater to start when both the real-time temperature of the liquid ammonia and the real-time temperature of the heat-carrying liquid are lower than a preset temperature value.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid ammonia storage and transportation equipment, and particularly to a liquid ammonia tank container. Background Art

[0002] In the production process of semiconductor materials, nitrogen is required as a protective gas during welding. There is a certain amount of oxygen in nitrogen, and in order to remove oxygen, hydrogen reduction is required, and hydrogen is obtained by decomposing liquid ammonia. Before entering the decomposition equipment, liquid ammonia needs to absorb heat to become gaseous ammonia.

[0003] Currently, liquid ammonia is transported through a liquid ammonia tank container and then transferred to a liquid ammonia storage tank. When users use it, liquid ammonia is output from the liquid ammonia storage tank, and then heated and evaporated by means such as finned air heat exchange, steam plate heat exchange, or electric heating water bath heat exchange to obtain gaseous ammonia, and then enters the decomposition equipment. In the above-mentioned usage method, there is a risk of leakage when the liquid ammonia in the liquid ammonia tank container is transferred to the liquid ammonia storage tank. Summary of the Invention

[0004] The purpose of the present invention is to provide a relatively safe liquid ammonia tank container to solve the problems in the prior art.

[0005] To solve the above technical problems, the present invention provides a liquid ammonia tank container, including a frame and a tank body disposed within the frame. The liquid ammonia tank container further includes: a heating and evaporation system, including a coil for allowing a heat-carrying liquid to flow, a circulation pump for providing the driving force for the heat-carrying liquid to flow, and a heater for heating the heat-carrying liquid; the coil is located inside the tank body or wound around the outer wall of the tank body to heat the liquid ammonia in the tank body and convert the liquid ammonia into gaseous ammonia for output; a gas-phase pipeline, communicating with the gas-phase space of the tank body for outputting gaseous ammonia; a liquid ammonia temperature detector, communicating with the inside of the tank body for detecting the real-time temperature of the liquid ammonia in the tank body; a heat-carrying liquid temperature detector, communicating with the coil for detecting the real-time temperature of the heat-carrying liquid; a control system, electrically connected to the heater, the liquid ammonia temperature detector, and the heat-carrying liquid temperature detector respectively, and controlling the heater to start when the real-time temperature of the liquid ammonia and the real-time temperature of the heat-carrying liquid are both lower than a preset temperature value.

[0006] In one of the embodiments, a pressure-limiting device is further included; the pressure-limiting device communicates with the inside of the tank body and is electrically connected to the control system, so that when the pressure value in the tank body reaches the threshold value of the pressure-limiting device, the control system controls the heater to stop heating.

[0007] In one embodiment, a flow detector is provided on the gas pipeline for detecting the flow rate of gaseous ammonia output on the gas output pipeline, and the flow detector is electrically connected to the control system. The control system controls the heating power of the heater according to the flow rate.

[0008] In one embodiment, a pressure detector is provided on the gas pipeline for detecting the pressure of gaseous ammonia output on the gas output pipeline, and the pressure detector is electrically connected to the control system. The control system controls the heating power of the heater according to the pressure.

[0009] In one embodiment, the power of the heater is not less than 1.3 times the power required for the maximum unloading flow rate of the tank body.

[0010] In one embodiment, the heating and evaporation system further includes a temperature limiting device; the temperature limiting device is communicated with the heater and electrically connected to the control system, so that when the temperature in the heater reaches the threshold value of the temperature limiting device, the control system controls the heater to stop heating.

[0011] In one embodiment, an input pipeline is connected between the input port of the coil pipe and the inlet of the circulation pump, and an output pipeline is connected between the output port of the coil pipe and the outlet of the circulation pump; both the input pipeline and the output pipeline are located outside the tank body; the heater is arranged on the input pipeline or the output pipeline.

[0012] In one embodiment, the heating and evaporation system further includes an expansion tank; the expansion tank is connected to the output port of the coil pipe and the output pipeline; the expansion tank is connected to the top side beam of the frame.

[0013] In one embodiment, the circulation pump and the heater are respectively connected to the bottom side beam of the frame to achieve fixation.

[0014] In one embodiment, both the circulation pump and the heater adopt explosion-proof structures; the circulation pump and the heater are respectively detachably connected to the bottom side beam.

[0015] In one embodiment, the control system includes a cabinet body and a control unit arranged in the cabinet body; the cabinet body adopts an explosion-proof structure, and the control unit is electrically connected to the heater, the liquid ammonia temperature detector and the heat-carrying liquid temperature detector respectively.

[0016] It can be seen from the above technical solutions that the advantages and positive effects of the present invention are as follows:

[0017] The liquid ammonia tank container of the present invention converts the liquid ammonia in the tank into gaseous ammonia through a heating and evaporation system, and can directly transport it to the user end for the user to use, reducing the transfer steps and the risk of leakage during the transfer process. Moreover, this liquid tank container can not only transport and store liquid ammonia, but also convert liquid ammonia into gaseous ammonia by heating, increase the pressure in the tank to achieve the unloading function, and directly complete the process of evaporating liquid ammonia into gaseous ammonia, simplifying the traditional process of "transporting, transferring, evaporating, and using" liquid ammonia to "transporting and using", thus enhancing the use value of this liquid ammonia tank container.

[0018] In this liquid ammonia tank container, the real-time temperature of the liquid ammonia in the tank is detected by a liquid ammonia temperature detector, and the real-time temperature of the heat-carrying liquid in the circulation pipeline is detected by a heat-carrying liquid temperature detector. And only when the temperatures of both are lower than the preset temperature value does the heater start to heat, improving the heating accuracy and ensuring safety. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of one embodiment of the liquid ammonia tank container of the present invention;

[0020] Figure 2 is a schematic diagram of the heating and evaporation system of the present invention.

[0021] The description of the reference numerals is as follows:

[0022] 1. Frame; 2. Tank body; 3. Heating and evaporation system; 31. Circulation pump; 32. Input pipeline; 33. Output pipeline; 34. Coiled pipe; 35. Heater; 36. Temperature-limiting device; 37. Expansion tank; 4. Gas-phase pipeline; 5. Liquid ammonia temperature detector; 6. Heat-carrying liquid temperature detector; 7. Control system. Detailed Description of the Preferred Embodiment

[0023] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and not for limiting the present invention.

[0024] To further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0025] Refer to Figure 1 , the present invention provides a liquid ammonia tank container, including a tank body 2, a frame 1 supporting the tank body 2, a liquid ammonia temperature detector 5, a heat-carrying liquid temperature detector 6, a heating and evaporation system 3 modified, a control system 7, a flow detector, and a gas-phase pipeline 4. The liquid ammonia in the tank body 2 is heated by the heating and evaporation system 3 modified, so that this liquid ammonia tank container directly outputs gaseous ammonia.

[0026] The frame 1 includes a front end frame and a rear end frame arranged at intervals, and a top side beam and a bottom side beam connecting the front end frame and the rear end frame.

[0027] The tank body 2 is arranged inside the frame 1 and is used to load liquid ammonia. A gas phase output port is arranged at the top of the tank body 2 for outputting gaseous ammonia.

[0028] The gas phase pipeline 4 is communicated with the gas phase output port and is communicated with the gas phase space inside the tank body 2, and then gaseous ammonia is output to the outside. Specifically, a gas phase valve is arranged on the gas phase pipeline 4 to control the on-off between the tank body 2 and the outside.

[0029] For convenience of description, it is defined that the axial direction of the tank body 2 is the length direction of the frame 1, that is, the axis of the tank body 2 is parallel to the length direction of the top side beam.

[0030] The heating and evaporation system 3 is used to provide heat for the liquid ammonia in the tank body 2, so that the liquid ammonia absorbs heat and is converted into gaseous ammonia, and due to the generation of gaseous ammonia, the pressure inside the tank body 2 increases and can be output to the outside, realizing the unloading of the liquid ammonia tank container.

[0031] Refer to Figure 2 , the heating and evaporation system 3 includes a circulation pump 31, an input pipeline 32, an output pipeline 33, a coil pipe 34, a heater 35 and an expansion tank 37.

[0032] The input pipeline 32, the output pipeline 33, the coil pipe 34 and the circulation pump 31 form a closed circulation path, and the heat-carrying liquid flows in this circulation path. Among them, the heat-carrying liquid is a heat-conducting liquid, such as water, ethylene glycol or other liquids. The heat-carrying liquid exchanges heat with the liquid ammonia, so that the liquid ammonia absorbs the heat of the heat-carrying liquid and is then converted into gaseous ammonia.

[0033] In this embodiment, the coil pipe 34 is arranged inside the tank body 2. Specifically, the coil pipe 34 includes multiple layers of pipelines arranged parallel up and down, and each layer of pipeline includes an inlet pipe section, an outlet pipe section and a transition pipe section connecting the inlet pipe section and the outlet pipe section. And the multiple layers of pipelines of the coil pipe 34 are arranged from the top of the tank body 2 to the bottom of the tank body 2.

[0034] Multiple inlet pipe sections, outlet pipe sections and transition pipe sections can be arranged in each layer of pipeline according to needs.

[0035] In other embodiments, it can also be arranged from the middle of the height direction of the tank body 2 to the bottom of the tank body 2, and can be specifically set according to actual needs.

[0036] In this embodiment, the coil pipe 34 has an input port and two output ports. The input port of the coil pipe 34 is located in the middle in the height direction of the tank body 2, and an output port is respectively arranged at the top and bottom of the coil pipe 34. After the heat-carrying liquid enters the coil pipe 34, it is divided into two parallel paths and flows. One path flows towards the top of the tank body 2, and the other path flows towards the bottom of the tank body 2, and respectively reaches the output ports of the coil pipe 34.

[0037] Both the input port and the output port of the coil pipe 34 are located at the rear end of the frame 1, that is, close to the rear end frame.

[0038] The input pipeline 32 is connected to the input port of the coil pipe 34, and the input pipeline 32 is located outside the tank body 2. A control valve is arranged on the input pipeline 32 to control the on-off between the input pipeline 32 and the coil pipe 34. Specifically, the input pipeline 32 is a flexible pipe.

[0039] In this embodiment, the input pipeline 32 extends from the middle of the frame 1 to the rear end frame and then is connected to the input port of the coil pipe 34.

[0040] The output pipeline 33 is connected to the input and output port of the coil pipe 34, and is located outside the tank body 2. A control valve is arranged on the output pipeline 33 to control the on-off between the output pipeline 33 and the coil pipe 34. Specifically, the input and output pipeline is a PVC flexible pipe.

[0041] In this embodiment, the output pipeline 33 extends from the middle of the frame 1 to the rear end frame and then is connected to the output port of the coil pipe 34.

[0042] The circulation pump 31 has an inlet end and an outlet end. The inlet end is connected to the input pipeline 32, and the outlet end is connected to the output pipeline 33. The circulation pump 31 provides the power for the heat-carrying liquid to flow, so that the heat-carrying liquid continuously flows in the circulation path.

[0043] Specifically, the circulation pump 31 is arranged on the side of the frame 1, and the circulation pump 31 is detachably connected to the frame 1 by means of fasteners. The above setting method makes the overhaul and maintenance of the circulation pump 31 more convenient.

[0044] In this embodiment, the circulation pump 31 is connected to the bottom side beam and is located in the middle in the length direction of the frame 1 to realize the fixation of the circulation pump 31. Among them, the middle in the length direction of the frame 1 does not specifically refer to the center point of the length of the frame 1, but an area including this center point.

[0045] In this embodiment, the circulation pump 31 adopts an explosion-proof structure, which improves the safety level of the heating and evaporation system 3, making the liquid ammonia tank container safer during the unloading process. In other embodiments, the circulation pump 31 can also adopt a non-explosion-proof structure according to actual situations.

[0046] In other embodiments, the coil pipe 34 can also be arranged around the outer wall of the tank body 2.

[0047] The heater 35 is disposed on the output pipeline 33 for heating the heat-carrying liquid in the circulation path. In other embodiments, the heater 35 can also be disposed on the input pipeline 32.

[0048] The heater 35 is disposed on the side of the frame 1, and the heater 35 is detachably connected to the frame 1 by means of fasteners. In this embodiment, the heater 35 is connected to the bottom side beam and is close to the rear end frame to realize the fixation of the heater 35. The above setting method makes the inspection and maintenance of the heater 35 more convenient.

[0049] Specifically, the heater 35 adopts an explosion-proof structure, which improves the safety level of the heating and evaporation system 3 modification and makes the liquid ammonia tank container safer during the unloading process. In other embodiments, the heater 35 can also adopt a non-explosion-proof structure according to actual conditions.

[0050] The expansion tank 37 is communicated with the output port of the coil pipe 34 and the output pipeline 33. The expansion tank 37 is used for compensating the volume change of the heat-carrying liquid during the heating and cooling processes and evacuating the gas in the circulation pipeline.

[0051] The expansion tank 37 is detachably connected to the top side beam by means of fasteners to realize the fixation of the expansion tank 37. In this embodiment, the expansion tank 37 is disposed close to the rear end frame.

[0052] When the heating and evaporation system 3 modification is in use, the heat-carrying liquid is heated by the heater 35, and the heat-carrying liquid is continuously circulated by the circulation pump 31, so that the temperature of the heat-carrying liquid in the coil pipe 34 is higher than the temperature of the liquid ammonia in the tank body 2. Furthermore, the liquid ammonia exchanges heat with the heat-carrying liquid. After absorbing the temperature of the heat-carrying liquid, the liquid ammonia is converted into gaseous ammonia, and the gaseous ammonia is transported to the user end through the gas phase pipeline 4, and the user end can directly use it. The steps of transfer storage are reduced, and the risk of leakage during the transfer storage process is reduced. Moreover, this liquid ammonia tank container can not only transport and store liquid ammonia, but also realize the unloading function by heating the liquid ammonia to convert it into gaseous ammonia to increase the pressure in the tank body 2, and directly complete the process of vaporizing the liquid ammonia into gaseous ammonia, simplifying the traditional process of "transporting, transferring and storing, evaporating, using" of liquid ammonia to "transporting, using", and enhancing the use value of this liquid ammonia tank container.

[0053] The liquid ammonia temperature detector 5 is communicated with the inside of the tank body 2. Specifically, it is communicated with the liquid phase space of the tank body 2 for detecting the real-time temperature of the liquid ammonia in the tank body 2. In this embodiment, the liquid ammonia temperature detector 5 is a temperature probe. And the liquid ammonia temperature detector 5 is disposed at the bottom of the tank body 2.

[0054] The heat-carrying liquid temperature detector 6 is disposed on the input pipeline 32 for detecting the real-time temperature of the heat-carrying liquid in the circulation path. The heat-carrying liquid temperature detector 6 can also be disposed on the output pipeline 33. In this embodiment, the heat-carrying liquid temperature detector 6 is a temperature probe.

[0055] The control system 7 includes a cabinet body and a control unit, a GPS unit, and a monitoring unit disposed inside the cabinet body.

[0056] The cabinet body adopts an explosion-proof structure, which improves the safety level of the control system 7. The cabinet body is disposed on the side of the frame 1, and the cabinet body is detachably connected to the frame 1 by means of fasteners. In this embodiment, the cabinet body is connected to the bottom side beam to achieve the fixation of the cabinet body. The above setting method makes the maintenance and repair of the heater 35 more convenient.

[0057] In this embodiment, the cabinet body, the circulation pump 31, and the heater 35 are located on the same side of the tank body 2 and are arranged in sequence along the direction from the front end frame to the rear end frame, that is, the heater 35 is close to the rear end frame, the circulation pump 31 is located in the middle of the bottom side beam, and the cabinet body is located between the front end frame and the circulation pump 31.

[0058] In other embodiments, the cabinet body can also be disposed at the rear end frame.

[0059] The control unit is electrically connected to the heater 35, the liquid ammonia temperature detector 5, and the heat transfer fluid temperature detector 6 respectively.

[0060] The control unit receives the real-time temperature of the liquid ammonia temperature detector 5 and the real-time temperature of the heat transfer fluid temperature detector 6. When the real-time temperatures of both the liquid ammonia and the heat transfer fluid are lower than the temperature preset value, the control unit controls the heater 35 to heat.

[0061] The temperature preset value is calculated through the corresponding relationship between the saturated ammonia gas pressure and the temperature, wherein the pressure of the saturated ammonia gas comes from the needs of the customer.

[0062] The liquid ammonia temperature detector 5 detects the real-time temperature of the liquid ammonia in the tank body 2, and the heat transfer fluid temperature detector 6 detects the real-time temperature of the heat transfer fluid on the circulation pipeline. Only when the temperatures of both are lower than the temperature preset value, the heater 35 starts to heat, which improves the accuracy and ensures the safety. It avoids the situation that when one of the liquid ammonia or the heat transfer fluid is lower than the temperature preset value, the heater 35 starts to heat, resulting in the unloading flow rate of the gaseous ammonia being higher than the customer's demand.

[0063] For example, when the temperature of the heat transfer fluid is lower than the temperature preset value, but the temperature value of the liquid ammonia is higher than or equal to the temperature preset value. At this time, the liquid ammonia meets the requirements and can be converted into gaseous ammonia. If the heater 35 starts to heat, it will cause the temperature of the heat transfer fluid to rise, and then the temperature of the liquid ammonia to rise, resulting in the unloading flow rate of the gaseous ammonia being greater than the customer's demand. Or the temperature of the liquid ammonia is lower than the temperature preset value, but the temperature value of the heat transfer fluid is higher than the temperature preset value. At this time, the liquid ammonia and the heat transfer fluid can still exchange heat to make the temperature of the liquid ammonia meet the requirements. If the heater 35 heats at this time, it will ultimately cause the temperature of the liquid ammonia to be too high, and the unloading flow rate of the gaseous ammonia to be greater than the customer's demand.

[0064] Furthermore, the heating and evaporation system 3 further includes a temperature limiting device 36, which is electrically connected to the control unit. The temperature limiting device 36 is used to detect the temperature inside the heater 35. When the temperature inside the heater 35 reaches the threshold of the temperature limiting device 36, the temperature limiting device 36 sends this signal to the control unit, and the control unit controls the heater 35 to stop heating based on this signal. This avoids the situation where when the circulation pump 31 stops working due to a fault and the temperatures detected by the liquid ammonia temperature detector 5 and the heat-carrying liquid temperature detector 6 are lower than the preset temperature values, the heater 35 continues to heat, resulting in too high a temperature inside the heater 35 and even causing the heat-carrying liquid to vaporize, leading to excessive pressure in the circulation pipeline.

[0065] Specifically, the temperature limiting device 36 is a temperature probe.

[0066] Furthermore, the liquid ammonia tank container further includes a pressure limiting device. The pressure limiting device communicates with the inside of the tank body 2 and is used to detect the real-time pressure inside the tank body 2. The pressure limiting device is electrically connected to the control unit. When the pressure limiting device detects that the pressure inside the tank body 2 reaches its threshold, the pressure limiting device sends this signal to the control unit, and the control unit controls the heater 35 to stop heating based on this signal, so that the temperature of the heat-carrying liquid no longer continues to rise, reducing the conversion of liquid ammonia to gaseous ammonia and avoiding further increase in the pressure inside the tank body 2, ensuring the safety of the tank body 2.

[0067] Specifically, the threshold of the pressure limiting device is less than the design pressure value of the tank body 2. For example, 0.9 times the design pressure value of the tank body 2, 0.8 times the design pressure value of the tank body 2, etc.

[0068] The flow detector is arranged on the gas-phase pipeline 4 of the tank body 2 and is used to detect the flow rate of the gaseous ammonia output on the gas-phase pipeline 4. The flow detector is electrically connected to the control unit and sends the flow rate of the gaseous ammonia to the control unit. The control unit calculates the heating power of the heater 35 based on the difference between this flow rate and the preset flow rate value, and controls the heater 35 to heat at this heating power, thereby achieving the same flow rate of gaseous ammonia in the final gas-phase pipeline 4 as the preset flow rate, making the unloading more accurate and better meeting the customer's needs.

[0069] The control unit controls the heater 35 to heat through a solid-state relay. In this embodiment, the solid-state relay is a thyristor solid-state relay.

[0070] Specifically, the rated power of the heater 35 is 1.3 times the power required for the maximum unloading flow rate of the tank body 2.

[0071] In other embodiments, the flow detector can also be a pressure detector. The heating power of the heater 35 is calculated based on the difference between the detected pressure and the preset pressure.

[0072] In another embodiment, a flow detector and a pressure detector may also be provided on the gas-phase pipeline 4. The two can be used as backups for each other, that is, the control unit calculates the heating power of the heater 35 based on one of them. The two can also work simultaneously, that is, the control unit finally calculates a heating power based on the detection values of both of them.

[0073] The GPS unit is used to detect the position of the liquid ammonia tank container in real time during transportation and upload the position information to the cloud database. Users can view the position of the liquid ammonia tank container through the cloud database.

[0074] The monitoring unit is used to monitor the operating state information of the liquid ammonia tank container, such as the pressure and temperature in the tank body 2, the temperature of the heating and evaporation system 3, etc.

[0075] This liquid ammonia tank container can be used for transporting liquid ammonia. When in use, it can be located through the GPS unit, and the state of the liquid ammonia tank container can also be monitored through the monitoring unit; after being transported to the destination, unload the liquid ammonia and directly output gaseous ammonia through this liquid ammonia tank container for users to use.

[0076] The unloading process of using this liquid ammonia tank container is as follows:

[0077] S1. Detect the real-time temperature of the liquid ammonia in the tank body 2 and the real-time temperature of the heat-carrying liquid in the circulation pipeline, and compare them with the temperature preset value.

[0078] S2. When the real-time temperature of the liquid ammonia and the real-time temperature of the heat-carrying liquid are both lower than the temperature preset value, control the heater 35 to start heating.

[0079] Specifically, the heater 35 heats the heat-carrying liquid, and the heat-carrying liquid flows in the circulation pipeline, enabling the heat-carrying liquid to exchange heat with the liquid ammonia. Then, after the liquid ammonia absorbs heat, it is converted into gaseous ammonia.

[0080] S3. Detect the flow rate of the gaseous ammonia output from the gas-phase pipeline 4 and compare it with the flow rate preset value.

[0081] S4. Obtain the heating power of the heater 35 based on the difference between the flow rate preset value and the gaseous ammonia flow rate value, and control the heater 35 to heat at this heating power.

[0082] S5. When the pressure in the tank body 2 exceeds the threshold value of the pressure-limiting device, the control unit controls the heater 35 to stop heating.

[0083] S6. When the temperature in the heater 35 exceeds the threshold value of the temperature-limiting device 36, the control unit controls the heater 35 to stop heating.

[0084] It should be specifically noted that the control unit, GPS unit, and monitoring unit are not limited to their physical states. That is, in the above embodiments, the control unit, GPS unit, and monitoring unit are separate structures respectively, or they can also be integrated into one body.

[0085] As can be seen from the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0086] In the liquid ammonia tank container of the present invention, the liquid ammonia in the tank is converted into gaseous ammonia through the heating and evaporation system, and can be directly transported to the user end for the user to use, reducing the steps of transfer storage and lowering the risk of leakage during the transfer storage process. Moreover, this liquid tank container can not only transport and store liquid ammonia, but also convert liquid ammonia into gaseous ammonia by heating, increase the pressure in the tank to achieve the unloading function, and directly complete the process of liquid ammonia evaporation into gaseous ammonia, simplifying the traditional process of "transportation, transfer storage, evaporation, use" of liquid ammonia to "transportation, use", and enhancing the use value of this liquid ammonia tank container.

[0087] In this liquid ammonia tank container, the real-time temperature of the liquid ammonia in the tank is detected by the liquid ammonia temperature detector, and the real-time temperature of the heat-carrying liquid in the circulation pipeline is detected by the heat-carrying liquid temperature detector. And only when the temperatures of both are lower than the preset temperature value does the heater 35 start to heat, improving the accuracy of heating and ensuring safety.

[0088] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly interpreted within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A liquid ammonia tank container, comprising a frame and a tank body disposed within the frame, characterized in that, The ammonia tank container further comprises: A heating and evaporation system, including a coil for allowing a heat-carrying liquid to flow, a circulation pump for providing the driving force for the flow of the heat-carrying liquid, and a heater for heating the heat-carrying liquid; the coil is located inside the tank or wound around the outer wall of the tank to heat the liquid ammonia inside the tank and convert the liquid ammonia into gaseous ammonia for output; A gas-phase pipeline, which is communicated with the gas-phase space of the tank for outputting gaseous ammonia; A liquid ammonia temperature detector, which is communicated with the inside of the tank for detecting the real-time temperature of the liquid ammonia in the tank; A heat-carrying liquid temperature detector, which is communicated with the coil for detecting the real-time temperature of the heat-carrying liquid; A control system, which is electrically connected to the heater, the liquid ammonia temperature detector and the heat-carrying liquid temperature detector respectively, and controls the heater to start when both the real-time temperature of the liquid ammonia and the real-time temperature of the heat-carrying liquid are lower than the preset temperature value.

2. The liquid ammonia tank container according to claim 1, characterized in that, It further comprises a pressure-limiting device; the pressure-limiting device is communicated with the inside of the tank and electrically connected to the control system, so that when the pressure value in the tank reaches the threshold value of the pressure-limiting device, the control system controls the heater to stop heating.

3. The liquid ammonia tank container according to claim 1, characterized in that, A flow detector is provided on the gas-phase pipeline for detecting the flow rate of the gaseous ammonia output on the gas-phase pipeline, and the flow detector is electrically connected to the control system, and the control system controls the heating power of the heater according to the flow rate.

4. The liquid ammonia tank container according to claim 1, characterized in that, A pressure detector is provided on the gas-phase pipeline for detecting the pressure of the gaseous ammonia output on the gas-phase pipeline, and the pressure detector is electrically connected to the control system, and the control system controls the heating power of the heater according to the pressure.

5. The liquid ammonia tank container according to claim 3 or 4, characterized in that, The power of the heater is not less than 1.3 times the power required for the maximum unloading flow rate of the tank.

6. The liquid ammonia tank container according to claim 1, characterized in that, The heating and evaporation system further comprises a temperature-limiting device; the temperature-limiting device is communicated with the heater and electrically connected to the control system, so that when the temperature in the heater reaches the threshold value of the temperature-limiting device, the control system controls the heater to stop heating.

7. The liquid ammonia tank container according to claim 1, characterized in that, An input pipeline is connected between the input port of the coil and the inlet of the circulation pump, and an output pipeline is connected between the output port of the coil and the outlet of the circulation pump; Both the input pipeline and the output pipeline are located outside the tank; The heater is arranged on the input pipeline or the output pipeline.

8. The liquid ammonia tank container according to claim 7, characterized in that, The heating and evaporation system further comprises an expansion tank; the expansion tank is connected to the output port of the coil and the output pipeline; The expansion tank is connected to the top side beam of the frame.

9. The liquid ammonia tank container according to claim 1, characterized in that, The circulation pump and the heater are respectively connected to the bottom side beam of the frame to achieve fixation.

10. The liquid ammonia tank container according to claim 9, characterized in that, Both the circulation pump and the heater adopt explosion-proof structures; The circulation pump and the heater are respectively detachably connected to the bottom side beam.

11. The liquid ammonia tank container according to claim 1, characterized in that, The control system includes a cabinet body and a control unit arranged inside the cabinet body; the cabinet body adopts an explosion-proof structure, and the control unit is electrically connected to the heater, the liquid ammonia temperature detector and the heat-carrying liquid temperature detector respectively.

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