Ammonia gas treatment system and ship ammonia fuel supply system

Abstract

The utility model provides an ammonia gas treatment system which comprises an ammonia gas collecting pipeline, an air inlet valve group, an ammonia gas treatment device and a control unit, one end of the ammonia gas collecting pipeline is used for being connected with a liquid ammonia supply system, the other end of the ammonia gas collecting pipeline is connected with an inlet of the air inlet valve group, and an outlet of the air inlet valve group is connected with an inlet of the ammonia gas treatment device; the air inlet valve group comprises a switch valve and a check valve which are arranged in parallel, a pressure sensor is arranged on the ammonia gas collecting pipeline, and the control unit is respectively in electric signal connection with the pressure sensor, the switch valve and the ammonia gas treatment device; the control unit is used for controlling the switching valve and the ammonia gas treatment device to be started when the pressure sensor detects that the ammonia gas pressure in the ammonia gas collection pipeline reaches a preset value; wherein the preset value is smaller than the opening pressure of the check valve. The utility model further provides a ship ammonia fuel supply system.

Description

Technical Field

[0001] This utility model relates to the field of marine technology, and in particular to an ammonia processing system and a marine ammonia fuel supply system. Background Technology

[0002] With the greenhouse effect becoming increasingly severe, a global wave of carbon emission reduction has swept the world. In the shipbuilding industry, clean energy is also developing rapidly and will gradually replace fossil fuels as the main energy source for future ships. Ammonia, as an easily available and storable chemical, produces no carbon emissions when burned, and is gradually entering the ship fuel industry, becoming one of the most promising clean fuels for ships. Therefore, the shipbuilding industry has gradually increased its research efforts on ammonia fuel.

[0003] Because ammonia is toxic, it poses a danger to those exposed. Low concentrations of ammonia can irritate the eyes, lungs, and skin, while high concentrations or direct contact can be life-threatening. Classification societies such as DNV, BV, and CCS explicitly state that measures should be taken to prevent shipboard personnel from being exposed to ammonia. Protective measures must be implemented for leaks of ammonia (both liquid and gas) from the liquid ammonia supply system to ensure that the leaked ammonia does not vaporize and spread to non-hazardous areas where personnel are concentrated, thereby ensuring the safety of the ship during navigation.

[0004] Currently, ammonia treatment systems are generally used to absorb and treat ammonia generated by the liquid ammonia supply system. These systems include an ammonia collection pipeline and an ammonia treatment device. The collection pipeline connects the liquid ammonia supply system and the treatment device, and is equipped with a pressure sensor and a switching valve. When the pressure sensor detects that the ammonia pressure in the collection pipeline reaches a preset value, the control unit opens the switching valve and the treatment device to absorb the ammonia. However, because it takes time for the pressure sensor to detect overpressure and for the control unit to open the switching valve, this method is suitable for situations where the amount of ammonia generated / leaked by the liquid ammonia supply system is small. When the liquid ammonia supply system suddenly releases a large amount of ammonia into the treatment system, the switching valve may not open quickly enough, causing overpressure in the collection pipeline and posing a risk of pipeline rupture and ammonia leakage. Utility Model Content

[0005] The purpose of this invention is to provide an ammonia treatment system that can reduce or avoid the risk of overpressure rupture and ammonia leakage in ammonia collection pipelines.

[0006] This utility model provides an ammonia treatment system, including an ammonia collection pipeline, an inlet valve group, an ammonia treatment device, and a control unit. One end of the ammonia collection pipeline is connected to a liquid ammonia supply system, the other end of the ammonia collection pipeline is connected to the inlet of the inlet valve group, and the outlet of the inlet valve group is connected to the inlet of the ammonia treatment device.

[0007] The intake valve group includes a switching valve and a check valve arranged in parallel. A pressure sensor is provided on the ammonia collection pipeline. The control unit is electrically connected to the pressure sensor, the switching valve and the ammonia treatment device respectively.

[0008] The control unit is used to control the switching valve and the ammonia treatment device to open when the pressure sensor detects that the ammonia pressure in the ammonia collection pipeline has reached a preset value; wherein the preset value is less than the opening pressure of the check valve.

[0009] Furthermore, the preset value is 10KPa to 50KPa, and the opening pressure of the check valve is 30KPa to 200KPa.

[0010] Furthermore, the check valve is a lift check valve; and / or, the pressure sensor is a micro-pressure sensor.

[0011] Furthermore, the ammonia treatment device includes an induced draft fan, an absorption tower, and a circulating pump. The outlet of the inlet valve assembly is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the ammonia inlet of the absorption tower. A spray device is provided at the top of the absorption tower, and the ammonia outlet of the absorption tower is connected to the inlet of the circulating pump. The outlet of the circulating pump is connected to the spray device. The control unit is electrically connected to the induced draft fan and the circulating pump respectively.

[0012] Furthermore, the ammonia treatment device also includes an ammonia water storage tank, and the outlet of the circulating pump is connected to the ammonia water storage tank.

[0013] Furthermore, the absorption tower is equipped with an ammonia concentration detection device, and a first control valve is provided on the pipeline between the outlet of the circulating pump and the ammonia storage tank. The control unit is electrically connected to the ammonia concentration detection device and the first control valve respectively.

[0014] Furthermore, the ammonia treatment device also includes an absorbent replenishment pipeline, which is connected to the inlet of the circulating pump; a second control valve is provided on the absorbent replenishment pipeline, and the control unit is electrically connected to the second control valve.

[0015] Furthermore, an ammonia buffer tank is provided on the ammonia collection pipeline before the pressure sensor.

[0016] This utility model also provides a ship ammonia fuel supply system, including a liquid ammonia supply system and an ammonia processing system as described above, wherein one end of the ammonia collection pipeline is connected to the liquid ammonia supply system.

[0017] Furthermore, the liquid ammonia supply system includes a liquid ammonia storage tank, a liquid ammonia buffer tank, a booster pump, a heater, a double-walled pipe, and an ammonia fuel generator. The liquid ammonia storage tank is equipped with a liquid ammonia pump. The outlet of the liquid ammonia pump is connected to the inlet of the liquid ammonia buffer tank. The outlet of the liquid ammonia buffer tank is connected to the inlet of the booster pump. The outlet of the booster pump is connected to the inlet of the heater. The outlet of the heater is connected to one end of the inner tube of the double-walled pipe. The other end of the inner tube of the double-walled pipe is connected to the ammonia fuel generator. The ammonia gas collection pipeline is connected to the outer tube of the liquid ammonia storage tank and / or the liquid ammonia buffer tank and / or the double-walled pipe.

[0018] This utility model also provides a ship, including the ship ammonia fuel supply system described above.

[0019] The ammonia treatment system provided by this utility model includes an inlet valve group comprising a switching valve and a check valve connected in parallel. The control unit controls the opening pressure of the switching valve to be less than the opening pressure of the check valve. Therefore, when the amount of ammonia in the ammonia collection pipeline is small and the pipeline pressure rises slowly, the control unit controls the switching valve and the ammonia treatment device to open when the pressure sensor detects that the ammonia pressure in the ammonia collection pipeline has reached a preset value, in order to absorb and treat the ammonia. When the ammonia collection pipeline suddenly receives a large amount of ammonia and the ammonia pressure in the ammonia collection pipeline reaches the opening pressure of the check valve, the check valve automatically opens, thereby discharging the ammonia in the ammonia collection pipeline to the ammonia treatment device, avoiding the risk of overpressure rupture and ammonia leakage in the ammonia collection pipeline.

[0020] Meanwhile, since the check valve and the on / off valve are connected in parallel, when the on / off valve fails, the check valve can open normally when the pipeline pressure reaches its opening pressure, so that the ammonia treatment system can operate normally, thereby avoiding the ammonia collection pipeline from rupturing and leaking ammonia due to the inability to properly depressurize. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the ship ammonia fuel supply system in an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram showing the electrical signal connection between the control unit and other components in an embodiment of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of a ship ammonia fuel supply system in another embodiment of the present invention. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0026] like Figure 1 and Figure 2 As shown, this utility model embodiment provides an ammonia treatment system 1, including an ammonia collection pipeline 11, an inlet valve group 12, an ammonia treatment device 13, and a control unit 14. One end of the ammonia collection pipeline 11 is connected to a liquid ammonia supply system 2 to receive / collect ammonia emitted from the liquid ammonia supply system 2; the other end of the ammonia collection pipeline 11 is connected to the inlet of the inlet valve group 12, and the outlet of the inlet valve group 12 is connected to the inlet of the ammonia treatment device 13. The ammonia treatment device 13 is used to absorb and treat the ammonia in the ammonia collection pipeline 11.

[0027] The intake valve assembly 12 includes a switching valve 121 and a check valve 122 connected in parallel. One end of the ammonia collection pipeline 11 is connected to both the inlet of the switching valve 121 and the inlet of the check valve 122. The outlets of both the switching valve 121 and the check valve 122 are connected to the inlet of the ammonia treatment device 13. A pressure sensor 15 is installed on the ammonia collection pipeline 11, positioned near the inlet of the intake valve assembly 12. The control unit 14 is electrically connected to the pressure sensor 15, the switching valve 121, and the ammonia treatment device 13. The pressure sensor 15 detects the ammonia pressure in the ammonia collection pipeline 11 and transmits the data to the control unit 14. The control unit 14 controls the opening and closing of the switching valve 121 and the ammonia treatment device 13 based on the pressure value detected by the pressure sensor 15. Specifically, the control unit 14 is used to control the switching valve 121 and the ammonia treatment device 13 to open when the pressure sensor 15 detects that the ammonia pressure in the ammonia collection pipeline 11 reaches (greater than or equal to) a preset value; wherein, the preset value is less than the opening pressure of the check valve 122 (the opening pressure of the check valve 122 is also the automatic opening pressure of the check valve 122, that is, when the pipeline pressure reaches the opening pressure of the check valve 122, the check valve 122 automatically opens).

[0028] The ammonia treatment system provided in this embodiment of the invention includes an inlet valve group 12, which comprises a switching valve 121 and a check valve 122 connected in parallel. The control unit 14 controls the opening pressure of the switching valve 121 to be less than the opening pressure of the check valve 122. Therefore, when the amount of ammonia in the ammonia collection pipeline 11 is small and the pipeline pressure slowly increases, when the pressure sensor 15 detects that the ammonia pressure in the ammonia collection pipeline 11 has reached a preset value, the control unit 14 controls the switching valve 121 and the ammonia treatment device 13 to open to absorb the ammonia. (Simultaneously, because the ammonia slowly accumulates and pressurizes in the ammonia collection pipeline 11, when the pipeline pressure reaches the preset value, the system then...) Instead of keeping valve 121 constantly open, ammonia gas is absorbed and treated centrally, thus avoiding the prolonged operation of ammonia treatment device 13 and saving energy. When a large amount of ammonia gas is suddenly received in ammonia collection pipeline 11 and the pressure of ammonia gas in ammonia collection pipeline 11 reaches the opening pressure of check valve 122, check valve 122 automatically opens, thereby discharging the ammonia gas in ammonia collection pipeline 11 to ammonia treatment device 13, avoiding the risk of overpressure rupture and ammonia gas leakage in ammonia collection pipeline 11. (It should be noted that when check valve 122 opens automatically but ammonia treatment device 13 has not yet opened, the ammonia gas in ammonia collection pipeline 11 can also be absorbed after entering ammonia treatment device 13.)

[0029] Meanwhile, since the check valve 122 is connected in parallel with the switch valve 121, when the switch valve 121 fails, the check valve 122 can open normally when the pipeline pressure reaches its opening pressure, so that the ammonia treatment system can operate normally, thereby avoiding the ammonia collection pipeline 11 from rupturing and leaking ammonia due to the inability to properly depressurize.

[0030] Furthermore, in this embodiment, the preset value is 10KPa to 50KPa, or 10KPa to 20KPa. The opening pressure of the check valve 122 is 30KPa to 200KPa, or 30KPa to 100KPa, or 40KPa to 80KPa.

[0031] Furthermore, in this embodiment, the check valve 122 is a lift check valve. Lift check valves not only have good stability and high reliability, but also have a high opening pressure, which can meet the requirements of the operating conditions.

[0032] Furthermore, in this embodiment, the pressure sensor 15 is a micro-pressure sensor. The micro-pressure sensor is not only highly accurate but also highly sensitive, and can detect the pressure of a small flow of gas.

[0033] Furthermore, in this embodiment, the switching valve 121 can be an electrically controlled valve, a pneumatically controlled valve, etc., and the control unit 14 can be a PLC (Programmable Logic Controller), etc.

[0034] Furthermore, such as Figure 1 As shown, in this embodiment, there are two pressure sensors 15, which serve as backups for each other. When either pressure sensor 15 detects that the ammonia pressure in the ammonia collection pipeline 11 reaches a preset value, the control unit 14 controls the switching valve 121 and the ammonia processing device 13 to open.

[0035] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the ammonia treatment device 13 includes an induced draft fan 131, an absorption tower 132, and a circulating pump 133. The outlet of the inlet valve group 12 is connected to the inlet of the induced draft fan 131 (the outlet of the switch valve 121 and the outlet of the check valve 122 are both connected to the inlet of the induced draft fan 131). The outlet of the induced draft fan 131 is connected to the ammonia inlet of the absorption tower 132 (specifically, the ammonia inlet is located at the lower end of the absorption tower 132). A spray device 1321 is provided at the top of the absorption tower 132. The ammonia outlet of the absorption tower 132 is connected to the inlet of the circulating pump 133 (specifically, the ammonia outlet is located at the bottom of the absorption tower 132). The outlet of the circulating pump 133 is connected to the spray device 1321 (specifically, the spray device 1321 includes a spray pipe and multiple nozzles installed on the spray pipe, and the outlet of the circulating pump 133 is connected to the spray pipe). The control unit 14 is electrically connected to the induced draft fan 131 and the circulating pump 133, respectively. The control unit 14 is used to control the opening and closing of the induced draft fan 131 and the circulating pump 133. Specifically, the control unit 14 is used to control the induced draft fan 131 and the circulating pump 133 to start when the pressure sensor 15 detects that the ammonia pressure in the ammonia collection pipeline 11 has reached a preset value. At the same time, a first ammonia valve 138 is provided on the pipeline between the ammonia outlet of the absorption tower 132 and the inlet of the circulating pump 133, and a second ammonia valve 139 is provided on the pipeline between the outlet of the circulating pump 133 and the spray device 1321. The control unit 14 is electrically connected to the first ammonia valve 138 and the second ammonia valve 139 to control their opening and closing.

[0036] Furthermore, such as Figure 1 and Figure 2As shown, in this embodiment, the ammonia treatment device 13 further includes an ammonia storage tank 134, which is used to store ammonia. The outlet of the circulation pump 133 is also connected to the ammonia storage tank 134. An ammonia concentration detection device 1322 is provided on the absorption tower 132. The ammonia concentration detection device 1322 is used to detect the concentration of ammonia in the absorption tower 132. Specifically, the ammonia concentration detection device 1322 can be an ammonia concentration meter (or a pH meter, etc.). A first control valve 135 is provided on the pipeline between the outlet of the circulation pump 133 and the ammonia storage tank 134. The first control valve 135 can be an electrically controlled valve, etc. The control unit 14 is electrically connected to the ammonia concentration detection device 1322 and the first control valve 135 respectively. The control unit 14 is used to control the opening and closing of the first control valve 135 according to the ammonia concentration detected by the ammonia concentration detection device 1322.

[0037] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the ammonia treatment device 13 further includes an absorbent replenishment pipeline 136, which is connected to the inlet of the circulating pump 133. A second control valve 137 is provided on the absorbent replenishment pipeline 136. The second control valve 137 can be an electrically controlled valve, etc. A control unit 14 is electrically connected to the second control valve 137 and is used to control the opening and closing of the second control valve 137. Specifically, the absorbent replenishment pipeline 136 is used to replenish absorbent into the absorption tower 132. The absorbent is generally water (of course, the absorbent can also be dilute hydrochloric acid, etc.). One end of the absorbent replenishment pipeline 136 is connected to an absorbent storage tank (not shown in the figure, the absorbent storage tank is used to store the absorbent), and the other end of the absorbent replenishment pipeline 136 is connected to the pipeline between the ammonia outlet of the absorption tower 132 and the inlet of the circulating pump 133.

[0038] Specifically, when the ammonia treatment device 13 is in operation, the control unit 14 controls the induced draft fan 131 and the circulating pump 133 to start (the first control valve 135 and the second control valve 137 are closed, and the first ammonia water valve 138 and the second ammonia water valve 139 are opened). At this time, the induced draft fan 131 generates negative pressure through the rotation of the impeller, thereby transporting the ammonia in the ammonia collection pipeline 11 to the absorption tower 132. After entering the absorption tower 132, the ammonia first undergoes bubbling absorption (the absorption tower 132 contains an absorbent, and the ammonia inlet of the absorption tower 132 is located below the liquid surface of the absorbent, so the ammonia enters the absorption tower 132). The ammonia gas is first absorbed by bubbling in the absorbent. After absorbing the ammonia, dilute ammonia water is formed in the absorption tower 132. The unabsorbed ammonia gas escapes from the absorbent and flows upward in the absorption tower 132. At the same time, the circulation pump 133 transports the dilute ammonia water in the absorption tower 132 to the spray device 1321 for circulation spraying. The spray device 1321 sprays the dilute ammonia water from top to bottom. The sprayed dilute ammonia water comes into contact with the ammonia gas to further absorb the ammonia gas. (At the same time, in order to improve the absorption efficiency, packing can be set below the spray device 1321 to improve the mass transfer absorption efficiency between the dilute ammonia water and the ammonia gas). When the ammonia water concentration detection device 1322 detects that the concentration of ammonia water in the absorption tower 132 reaches the set value, that is, concentrated ammonia water is formed in the absorption tower 132, the control unit 14 controls the first control valve 135 to open (and simultaneously controls the second ammonia water valve 139 to close), and the circulation pump 133 transports the concentrated ammonia water in the absorption tower 132 to the ammonia water storage tank 134 for storage. Then, the control unit 14 controls the first control valve 135 to close and the second control valve 137 and the second ammonia valve 139 to open (at this time, the first ammonia valve 138 will generally be closed), and the fresh absorbent in the absorbent replenishment pipeline 136 is transported to the absorption tower 132 through the circulation pump 133 to improve the absorption efficiency.

[0039] like Figure 3 As shown, in another embodiment, an ammonia buffer tank 16 is provided on the ammonia collection pipeline 11 before the pressure sensor 15 (in other words, an ammonia buffer tank 16 is provided on the ammonia collection pipeline 11, and the pressure sensor 15 is located on the ammonia collection pipeline 11 between the ammonia buffer tank 16 and the inlet of the air valve group 12). The ammonia buffer tank 16 is located between the liquid ammonia supply system 2 and the air valve group 12. The ammonia buffer tank 16 can buffer and temporarily store the ammonia discharged from the liquid ammonia supply system 2, so as to further avoid the ammonia collection pipeline 11 from being overpressurized when the liquid ammonia supply system 2 suddenly discharges a large amount of ammonia.

[0040] like Figure 1 As shown, this utility model embodiment also provides a ship ammonia fuel supply system, including a liquid ammonia supply system 2 and the aforementioned ammonia processing system 1, with one end of the ammonia collection pipeline 11 connected to the liquid ammonia supply system 2.

[0041] Furthermore, such as Figure 1 As shown, in this embodiment, the liquid ammonia supply system 2 includes a liquid ammonia storage tank 21, a liquid ammonia buffer tank 22, a booster pump 23, a heater 24, a double-walled pipe 25, and an ammonia fuel generator 27. The liquid ammonia storage tank 21 is equipped with a liquid ammonia pump 211. The outlet of the liquid ammonia pump 211 is connected to the inlet of the liquid ammonia buffer tank 22. The outlet of the liquid ammonia buffer tank 22 is connected to the inlet of the booster pump 23. The outlet of the booster pump 23 is connected to the inlet of the heater 24. The outlet of the heater 24 is connected to one end of the inner pipe 251 of the double-walled pipe 25. The other end of the inner pipe 251 of the double-walled pipe 25 is connected to the ammonia fuel generator 27. The ammonia collection pipeline 11 is connected to the liquid ammonia storage tank 21, the liquid ammonia buffer tank 22, and the outer pipe 252 of the double-walled pipe 25.

[0042] Specifically, the liquid ammonia storage tank 21 is used to store liquid ammonia, the liquid ammonia buffer tank 22 is used to buffer and temporarily store liquid ammonia, the booster pump 23 is used to pressurize the liquid ammonia, and the heater 24 is used to heat the liquid ammonia (the heater 24 can be a heat exchanger, electric heater, etc.). The double-walled pipe 25 is used to improve the safety of liquid ammonia during transportation. The double-walled pipe 25 is a double-layered pipe, including an inner pipe 251 and an outer pipe 252 sleeved outside the inner pipe 251, with a gap between the inner pipe 251 and the outer pipe 252. At the same time, a GVU (Gas Valve Unit) valve group 26 is provided between the inner pipe 251 of the double-walled pipe 25 and the ammonia fuel main unit 27. That is, the inner pipe 251 of the double-walled pipe 25 is connected to the inlet of the GVU valve group 26, and the outlet of the GVU valve group 26 is connected to the ammonia fuel main unit 27. The GVU valve group 26 plays the role of conducting / cutting off the liquid ammonia supply and precisely regulating the supply pressure / flow of liquid ammonia. Under normal operating conditions, the low-temperature, low-pressure liquid ammonia in the liquid ammonia storage tank 21 is pumped by the liquid ammonia pump 211 to the liquid ammonia buffer tank 22. The liquid ammonia is then pressurized by the booster pump 23 and heated by the heater 24 (for example, to a temperature and pressure of 40°C and 8.3 MPa). The heated and pressurized liquid ammonia then passes through the inner pipe 251 of the double-walled pipe 25 and the GVU valve group 26 before being supplied to the ammonia fuel main unit 27 for combustion. For the specific structure and working principle of the liquid ammonia supply system 2, please refer to existing technologies; details will not be elaborated here.

[0043] Since the liquid ammonia in the liquid ammonia storage tank 21 and the liquid ammonia buffer tank 22 will inevitably absorb heat from the outside and vaporize into ammonia vapor (i.e., ammonia gas), the continuous accumulation and increase of ammonia vapor will cause overpressure in the liquid ammonia storage tank 21 and the liquid ammonia buffer tank 22. Therefore, the liquid ammonia storage tank 21 and the liquid ammonia buffer tank 22 are connected to the ammonia gas collection pipeline 11 so that when the pressure in the liquid ammonia storage tank 21 and the liquid ammonia buffer tank 22 reaches the set value, the excess ammonia gas in the liquid ammonia storage tank 21 and the liquid ammonia buffer tank 22 will be discharged to the ammonia gas treatment system 1 for absorption. At the same time, since the double-walled pipe 25 may experience internal leakage during use (i.e., the inner pipe 251 of the double-walled pipe 25 leaks, and the liquid ammonia in the inner pipe 251 leaks into the outer pipe 252 and absorbs heat to vaporize into ammonia gas), the outer pipe 252 of the double-walled pipe 25 is connected to the ammonia gas collection pipeline 11 so that when the double-walled pipe 25 experiences internal leakage, the leaked ammonia gas will be discharged to the ammonia gas treatment system 1 for absorption. Of course, in other embodiments, the ammonia collection pipeline 11 can also be connected to other components in the liquid ammonia supply system 2 that may leak ammonia or require ammonia discharge.

[0044] Furthermore, such as Figure 1 As shown, in this embodiment, safety relief valves 20 are provided on the liquid ammonia storage tank 21, the liquid ammonia buffer tank 22, and the outer pipe 252 of the double-walled pipe 25. The ammonia collection pipeline 11 is connected to the safety relief valves 20 on the liquid ammonia storage tank 21, the liquid ammonia buffer tank 22, and the outer pipe 252 of the double-walled pipe 25, respectively. When the pressure in the liquid ammonia storage tank 21 / liquid ammonia buffer tank 22 / outer pipe 252 reaches the discharge pressure of the corresponding safety relief valve 20, the corresponding safety relief valve 20 opens, thereby discharging the ammonia to the ammonia collection pipeline 11.

[0045] Furthermore, such as Figure 1 As shown, in this embodiment, the ammonia collection pipeline 11 includes a main pipeline (not labeled) and three branch pipelines (not labeled). One end of each of the three branch pipelines is connected to the main pipeline, and the other end of each branch pipeline is connected to a safety relief valve 20 on the liquid ammonia storage tank 21, the liquid ammonia buffer tank 22, and the outer pipe 252 of the double-walled pipe 25, respectively. The main pipeline is connected to the inlet of the inlet valve assembly 12, and a pressure sensor 15 is installed on the main pipeline.

[0046] This utility model embodiment also provides a ship, including the ship ammonia fuel supply system described above.

[0047] The following example illustrates the specific workflow of ammonia treatment system 1:

[0048] Combination Figure 1 and Figure 2Pressure sensor 15 is a micro-pressure sensor with a range of 0-20 kPa. Check valve 122 is a lift-type check valve with an opening pressure set at 50 kPa. When the pipeline pressure is greater than or equal to the opening pressure, check valve 122 opens; when the pipeline pressure is less than the opening pressure, check valve 122 closes. The switching valve 121 is a normally closed valve. The control unit 14 controls the switching valve 121 and the ammonia treatment device 13 to open at a critical pressure (i.e., the aforementioned preset value) set to 15 kPa. When the pressure sensor 15 detects that the ammonia pressure in the ammonia collection pipeline 11 reaches 15 kPa, the control unit 14 controls the ammonia treatment device 13 to open, and then controls the switching valve 121 to open. After working for a period of time (e.g., 5 minutes), the control unit 14 controls the switching valve 121 to close. If the detection value of the pressure sensor 15 still exceeds 15 kPa, the switching valve 121 is reopened. If the detection value of the pressure sensor 15 is lower than 15 kPa, the ammonia treatment device 13 is controlled to stop operating, thus completing one ammonia treatment cycle.

[0049] Specific operating condition 1: The liquid ammonia supply system 2 discharges a small amount of ammonia into the ammonia collection pipeline 11. The pressure sensor 15 detects a value below 15 kPa, indicating that the discharged ammonia is insufficient to open the switch valve 121, which remains closed. After this portion of ammonia is pressurized to 15 kPa, the pressure sensor 15 detects a value of 15 kPa, and the control unit 14 controls the ammonia treatment device 13 to open. Then, it controls the switch valve 121 to open, releasing the ammonia into the ammonia treatment device 13 for absorption. After 5 minutes, the switch valve 121 is closed. If the pressure sensor 15 still detects a value above 15 kPa, it is considered that the ammonia has not been completely released, and the switch valve 121 is reopened to continue ammonia release and absorption. If the pressure sensor 15 detects a value below 15 kPa, it is considered that the ammonia has been completely released, and the ammonia treatment device 13 is stopped, completing one ammonia treatment cycle.

[0050] Specific operating condition 2: The liquid ammonia supply system 2 discharges a large amount of ammonia into the ammonia collection pipeline 11. The pipeline pressure before check valve 122 rapidly increases to over 50 kPa, and check valve 122 automatically opens. Simultaneously, the detection value of pressure sensor 15 exceeds 15 kPa, and control unit 14 controls ammonia treatment device 13 to start and controls switch valve 121 to open for ammonia absorption. After working for a period of time, if the detection value of pressure sensor 15 is lower than 15 kPa, switch valve 121 is closed after a 5-minute delay. If the detection value of pressure sensor 15 is still higher than 15 kPa, it is considered that the ammonia has not been completely released, and switch valve 121 is reopened to continue ammonia release and absorption. If the detection value of pressure sensor 15 is lower than 15 kPa, it is considered that the ammonia has been completely released, and control ammonia treatment device 13 to stop operating, completing one ammonia treatment cycle.

[0051] The above is merely an illustrative description of the workflow of the ammonia treatment system 1. Of course, in other embodiments, the ammonia treatment system 1 may also adopt other operating modes.

[0052] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An ammonia treatment system, characterized by, It includes an ammonia collection pipeline, an inlet valve group, an ammonia treatment device, and a control unit. One end of the ammonia collection pipeline is connected to a liquid ammonia supply system, and the other end of the ammonia collection pipeline is connected to the inlet of the inlet valve group. The outlet of the inlet valve group is connected to the inlet of the ammonia treatment device. The intake valve group includes a switching valve and a check valve arranged in parallel. A pressure sensor is provided on the ammonia collection pipeline. The control unit is electrically connected to the pressure sensor, the switching valve and the ammonia treatment device respectively. The control unit is used to control the switching valve and the ammonia treatment device to open when the pressure sensor detects that the ammonia pressure in the ammonia collection pipeline has reached a preset value; wherein the preset value is less than the opening pressure of the check valve.

2. The ammonia treatment system of claim 1, wherein, The preset value is 10 kPa to 50 kPa, and the opening pressure of the check valve is 30 kPa to 200 kPa.

3. The ammonia treatment system of claim 1, wherein, The check valve is a lift check valve; and / or, the pressure sensor is a micro-pressure sensor.

4. The ammonia treatment system of claim 1, wherein, The ammonia treatment device includes an induced draft fan, an absorption tower, and a circulating pump. The outlet of the inlet valve assembly is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the ammonia inlet of the absorption tower. A spray device is provided at the top of the absorption tower, and the ammonia outlet of the absorption tower is connected to the inlet of the circulating pump. The outlet of the circulating pump is connected to the spray device. The control unit is electrically connected to the induced draft fan and the circulating pump respectively.

5. The ammonia treatment system of claim 4, wherein, The ammonia treatment device also includes an ammonia water storage tank, and the outlet of the circulating pump is connected to the ammonia water storage tank.

6. The ammonia treatment system of claim 5, wherein, The absorption tower is equipped with an ammonia concentration detection device, and a first control valve is installed on the pipeline between the outlet of the circulating pump and the ammonia storage tank. The control unit is electrically connected to the ammonia concentration detection device and the first control valve respectively.

7. The ammonia treatment system of claim 4, wherein, The ammonia treatment device also includes an absorbent replenishment pipeline, which is connected to the inlet of the circulation pump; a second control valve is provided on the absorbent replenishment pipeline, and the control unit is electrically connected to the second control valve.

8. The ammonia treatment system of any one of claims 1-7, wherein, An ammonia buffer tank is installed on the ammonia collection pipeline before the pressure sensor.

9. A marine ammonia fuel supply system, characterized by It includes a liquid ammonia supply system and an ammonia processing system as described in any one of claims 1-8, wherein one end of the ammonia collection pipeline is connected to the liquid ammonia supply system.

10. Marine ammonia fuel supply system according to claim 9, characterized in that The liquid ammonia supply system includes a liquid ammonia storage tank, a liquid ammonia buffer tank, a booster pump, a heater, a double-walled pipe, and an ammonia fuel generator. The liquid ammonia storage tank is equipped with a liquid ammonia pump. The outlet of the liquid ammonia pump is connected to the inlet of the liquid ammonia buffer tank. The outlet of the liquid ammonia buffer tank is connected to the inlet of the booster pump. The outlet of the booster pump is connected to the inlet of the heater. The outlet of the heater is connected to one end of the inner tube of the double-walled pipe. The other end of the inner tube of the double-walled pipe is connected to the ammonia fuel generator. The ammonia gas collection pipeline is connected to the outer tube of the liquid ammonia storage tank and / or the liquid ammonia buffer tank and / or the double-walled pipe.

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