A urea leak detection device for a marine SCR system

Abstract

This utility model relates to the field of marine equipment technology and discloses a urea leak detection device for a marine SCR system. It includes a sump, a leak alarm box, a control component, and multiple pneumatic quick-closing valves. The sump has multiple valves, and a collection port at its bottom is connected to a leak pipe. The leak alarm box has a urea leak inlet connected to the leak pipe and contains a level sensor. The control component includes an air supply main pipe and multiple air supply branch pipes connected to the main pipe. A normally closed solenoid valve is mounted on the main pipe and electrically connected to the level sensor. Each air supply branch pipe is connected to the inlet of one of the multiple pneumatic quick-closing valves, which are correspondingly located at the output end of the urea solution storage tank of the marine SCR system. This utility model can detect whether a urea leak has occurred in a marine SCR system and can control and cut off the leak source.

Description

Technical Field

[0001] This utility model relates to the field of marine equipment technology, and in particular to a urea leakage detection device for a marine SCR system. Background Technology

[0002] Currently, as countries are imposing increasingly stringent regulations on ship exhaust emissions, many ships are now equipped with marine SCR (Selective Catalytic Reduction) systems to reduce nitrogen oxide emissions. Marine SCR is an exhaust gas after-treatment technology that uses urea solution (ammonia source) to catalytically reduce nitrogen oxides (NOx) in exhaust gas, producing harmless nitrogen (N2) and water (H2O). Existing marine SCR systems typically include a urea solution storage tank, a supply unit, a metering unit, and a reactor. The urea solution in the storage tank is supplied to the metering unit and reactor via the supply unit for exhaust gas treatment. Additionally, marine SCR systems generally include a urea filling station and a urea transfer pump. Urea from the filling station is transferred to the storage tank via the transfer pump for urea solution injection. Therefore, the urea solution storage tank, supply unit, metering unit, reactor, urea filling station, and urea transfer pump are all considered urea leakage risk devices in marine SCR systems. Urea is corrosive and volatile; prolonged exposure can cause skin damage and respiratory system harm upon contact, and also pollute water quality. Therefore, it is necessary to monitor for urea leakage in marine SCR systems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a urea leakage detection device for a marine SCR system that can detect whether a urea leak has occurred in the system and can control and cut off the source of the leak.

[0004] To address the aforementioned technical problems, this utility model provides a urea leakage detection device for a marine SCR system, comprising a conduit, a leakage alarm box, a control component, and multiple pneumatic quick-closing valves. The conduit is positioned below the urea leakage risk equipment in the marine SCR system. Multiple conduits are provided, and a collection port is located at the bottom of each conduit, connected to a leakage pipe. The leakage alarm box contains a level sensor for detecting the liquid level within the box and a urea leakage inlet connected to multiple leakage pipes. The control component includes an air delivery main pipe and multiple air delivery branch pipes connected to the main pipe. A normally closed solenoid valve is mounted on the main air delivery pipe and electrically connected to the level sensor. Each air delivery branch pipe is connected to an air inlet of one of the multiple pneumatic quick-closing valves, which are correspondingly located at the output end of the urea solution storage tank of the marine SCR system.

[0005] As a preferred embodiment of this utility model, the device further includes a discharge box, which has an inlet and an outlet. The bottom of the discharge alarm box has a discharge port, which is connected to the inlet via a discharge pipe. A shut-off valve is installed on the discharge pipe.

[0006] As a preferred embodiment of this utility model, the output port is connected to the urea solution storage tank via a pump.

[0007] As a preferred embodiment of this utility model, the liquid level sensor of this device is electrically connected to the ship's AMS system.

[0008] As a preferred embodiment of this utility model, the control component of this device further includes a manual control valve, which is connected in parallel with the normally closed solenoid valve.

[0009] As a preferred embodiment of this utility model, the air delivery main pipe is provided with a switch valve.

[0010] As a preferred embodiment of this utility model, the liquid level sensor is a float alarm.

[0011] As a preferred embodiment of this utility model, the urea solution storage tank, supply unit, metering unit and reactor, urea filling station and urea delivery pump in the marine SCR system are respectively provided with the aforementioned conduit.

[0012] This invention discloses a urea leakage detection device for a marine SCR system. Compared with the prior art, its advantages are as follows: A cofferdam is positioned below the urea leakage risk device in the marine SCR system. When a urea leakage occurs in the urea leakage risk device, the leaked urea is collected by its corresponding cofferdam and transported to the urea discharge tank for collection via a discharge pipe. When the urea solution level in the urea discharge tank reaches the set value of the level sensor, the level sensor sends a signal indicating a urea leakage in the marine SCR system. Simultaneously, the level sensor sends a signal to control the normally closed solenoid valve to open, causing the pneumatic quick-closing valve to close the output end of the urea solution storage tank, thereby stopping the urea solution from being output and cutting off the leakage source. This invention can detect whether a urea leakage has occurred in a marine SCR system and can control and cut off the leakage source. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the connection structure between the discharge alarm box and the discharge box of this utility model;

[0015] In the diagram, 1 is the containment plate; 11 is the vent pipe; 2 is the vent alarm box; 21 is the urea vent inlet; 22 is the level sensor; 23 is the discharge port; 24 is the discharge pipe; 25 is the shut-off valve; 3 is the control component; 31 is the air supply main pipe; 32 is the air supply branch pipe; 33 is the normally closed solenoid valve; 34 is the manual control valve; 35 is the on / off valve; 4 is the pneumatic quick-closing valve; 5 is the vent box; 51 is the input port; 52 is the output port; 100 is the urea solution storage tank; 101 is the supply unit; 102 is the urea filling station; and 103 is the urea transfer pump. Detailed Implementation

[0016] 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.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] like Figure 1-2 As shown, a preferred embodiment of the present invention provides a urea leak detection device for a marine SCR system, comprising a containment pan 1, a leak alarm box 2, a control assembly 3, and multiple pneumatic quick-closing valves 4. The containment pan 1 is positioned below the urea leak risk device in the marine SCR system. Multiple containment pans 1 are provided. Specifically, in this embodiment, as shown... Figure 1As shown, a containment plate 1 is provided below the urea solution storage tank 100, supply unit 101, metering unit and reactor (not shown in the figure), urea filling station 102, and urea transfer pump 103, respectively. The containment plate 1 surrounds the corresponding urea leakage risk equipment. When urea leakage occurs in the above equipment, the leaked urea will be collected by the containment plate 1. The bottom of the containment plate 1 is provided with a collection port, which is connected to a discharge pipe 11. The discharge alarm box 2 is provided with a urea discharge inlet 21, which is connected to the discharge pipe 11. The discharge alarm box 2 is provided with a liquid level sensor for detecting the liquid level in the discharge alarm box 2. In this embodiment, the level sensor 22 is a float alarm. When the liquid level in the alarm box 2 reaches a set value, the float alarm sends a signal. The control component 3 includes an air supply main pipe 31 and multiple air supply branch pipes 32 connected to the air supply main pipe 31. One end of the air supply main pipe 31 is connected to the control air system, and the other end is connected to the multiple air supply branch pipes 32. A normally closed solenoid valve 33 is installed on the air supply main pipe 31. The normally closed solenoid valve 33 is electrically connected to the level sensor 22. It can be understood that the level sensor 22... The normally closed solenoid valve 33 is electrically connected via a relay or controller, enabling the level sensor 22 to provide feedback signals to control the opening and closing of the normally closed solenoid valve 33. Multiple air delivery branch pipes 32 are connected one-to-one to the air inlets of multiple pneumatic quick-closing valves 4. Each pneumatic quick-closing valve 4 is located at the output end of the urea solution storage tank 100 of the marine SCR system. It can be understood that the urea solution storage tank 100 of the marine SCR system has multiple output ends, each equipped with a pneumatic quick-closing valve 4. Under normal circumstances, the normally closed solenoid valve 33 is in the closed state, i.e., the air delivery main pipe... Air in 31 cannot be delivered to each pneumatic quick-closing valve 4 through air delivery branch pipe 32, and the pneumatic quick-closing valve 4 is in the open state, that is, each output end of urea solution storage tank 100 can deliver urea solution. When the liquid level sensor 22 detects that the liquid level in the discharge alarm box 2 reaches the set value, the liquid level sensor 22 feedback signal controls the normally closed solenoid valve 33 to open, and the air in the air delivery main pipe 31 is delivered to each pneumatic quick-closing valve 4 through air delivery branch pipe 32. After the pneumatic quick-closing valve 4 is ventilated, it closes, so that each output end of urea solution storage tank 100 stops delivering urea solution.

[0019] The working principle of this embodiment is as follows: The confining plate 1 is located below and surrounds the urea leakage risk device of the marine SCR system. When a urea leakage occurs in the urea leakage risk device of the marine SCR system, the leaked urea is collected by the corresponding confining plate 1 and transported to the urea discharge tank 5 for collection through the discharge pipe 11. When the liquid level of the urea solution in the urea discharge tank 5 reaches the set value of the liquid level sensor 22, the liquid level sensor 22 sends a signal to indicate that a urea leakage has occurred in the marine SCR system. At the same time, the liquid level sensor 22 sends a signal to control the normally closed solenoid valve 33 to open, so that the pneumatic quick-closing valve 4 can be activated to close the output end of the urea solution storage tank 100, thereby stopping the urea solution storage tank 100 from outputting urea solution, thus cutting off the leakage source. After the personnel handle the leakage, the normal operation of the marine SCR system is restored. This embodiment can detect whether a urea leakage has occurred in the marine SCR system and can control and cut off the leakage source.

[0020] For example, the device also includes a discharge box 5, which has an inlet 51 and an outlet 52. The bottom of the discharge alarm box 2 has a discharge port 23, which is connected to the inlet 51 through a discharge pipe 24. The discharge pipe 24 is equipped with a shut-off valve 25. After the shut-off valve 25 is opened, the urea solution in the discharge alarm box 2 will be discharged into the discharge box 5. The outlet 52 is connected to the urea solution storage tank 100 through a pump. When there is enough urea solution stored in the discharge box 5, the urea solution in the discharge box 5 can be pumped to the urea solution storage tank 100 through the pump.

[0021] For example, the liquid level sensor 22 of this device is electrically connected to the ship's AMS system (alarm and monitoring system). The signal emitted by the liquid level sensor 22 is transmitted to the ship's AMS system to remind the duty personnel to take action.

[0022] For example, the control component 3 of this device also includes a manual control valve 34, which is connected in parallel with the normally closed solenoid valve 33. When the normally closed solenoid valve 33 fails or in an emergency, the manual control valve 34 can be opened to cut off the urea output.

[0023] For example, an on / off valve 35 is provided on the air supply main pipe 31. The on / off valve 35 can control the opening and closing of the air supply main pipe 31 and can be used for the effectiveness test of the pneumatic quick-closing valve 4.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A urea leak detection device for a marine SCR system, characterized by: The system includes a containment pan, a venting alarm box, a control assembly, and multiple pneumatic quick-closing valves. The containment pan is installed below the urea leakage risk device of the marine SCR system. Multiple containment pans are provided, and a collection port is provided at the bottom of the containment pan, which is connected to a venting pipe. The venting alarm box has a urea venting inlet, which is connected to the venting pipe. The venting alarm box is equipped with a level sensor for detecting the liquid level inside the venting alarm box. The control assembly includes an air delivery main pipe and multiple air delivery branch pipes, each connected to the air delivery main pipe. The air delivery main pipe is equipped with a normally closed solenoid valve, which is electrically connected to the level sensor. The multiple air delivery branch pipes are connected one-to-one to the air inlets of the multiple pneumatic quick-closing valves. The pneumatic quick-closing valves are correspondingly located at the output end of the urea solution storage tank of the marine SCR system.

2. The urea leakage detection device for a marine SCR system according to claim 1, characterized in that: It also includes a discharge box, which has an input port and an output port. The bottom of the discharge alarm box has a discharge port, which is connected to the input port through a discharge pipe. The discharge pipe is equipped with a shut-off valve.

3. The urea leakage detection device for a marine SCR system according to claim 2, characterized in that: The output port is connected to the urea solution storage tank via a pump.

4. The urea leak detection apparatus for marine SCR system according to claim 1, characterized in that: The liquid level sensor is electrically connected to the ship's AMS system.

5. The urea leak detection apparatus for marine SCR system according to claim 1, characterized in that: The control assembly also includes a manual control valve, which is connected in parallel with the normally closed solenoid valve.

6. The urea leakage detection device for a marine SCR system according to claim 1, characterized in that: The air delivery main pipe is equipped with a switch valve.

7. The urea leakage detection device for a marine SCR system according to claim 1, characterized in that: The liquid level sensor is a float alarm.

8. The urea leakage detection device for a marine SCR system according to claim 1, characterized in that: The marine SCR system is equipped with the aforementioned conduit below the urea solution storage tank, supply unit, metering unit and reactor, urea filling station and urea delivery pump.

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