A marine denitration system

Abstract

The utility model provides a kind of marine denitration system, including denitration tower, air supply branch, fan, electric heater and urea solution injection device;The top end of the denitration tower is connected air supply branch, air supply branch end communicates ambient air, fan, electric heater and first temperature transmitter are set on air supply branch, the electric heater includes barrel, heat preservation layer, heating element, terminal box, import and export, barrel is wrapped heat preservation layer, barrel one side is provided with import, barrel other side is provided with export, heating element is arranged in barrel interior, heating element one end is connected terminal box, and terminal box is located barrel exterior;Import connects the air outlet of fan, and export connects denitration tower.The utility model aims at presenting a kind of marine denitration system, to be applicable to ship exhaust gas treatment, can be under the condition of low load, to ship exhaust gas is denitrated and is discharged, to meet denitration discharge standard.

Description

Technical Field

[0001] This utility model belongs to the field of denitrification equipment, and in particular relates to a marine denitrification system. Background Technology

[0002] Marine exhaust gas treatment systems mainly consist of two subsystems: denitrification and desulfurization. These systems treat marine diesel engine exhaust gases to prevent air pollution caused by uncontrolled emissions. Currently, marine denitrification devices, under low-load conditions, sometimes fail to meet emission standards even after injecting urea solution due to low temperatures at the injection point. Utility Model Content

[0003] In view of this, the present invention aims to propose a marine denitrification system suitable for ship exhaust gas treatment, which can denitrify ship exhaust gas under low load conditions to meet denitrification emission standards.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A marine denitrification system includes a denitrification tower, an air supply branch, a fan, an electric heater, and a urea solution injection device. The top of the denitrification tower is connected to the air supply branch, and the end of the air supply branch is connected to ambient air. The air supply branch is equipped with a fan, an electric heater, and a first temperature transmitter. The electric heater includes a barrel, an insulation layer, a heating element, a junction box, an inlet, and an outlet. The barrel is covered with an insulation layer. An inlet is located on one side of the barrel, and an outlet is located on the other side. A heating element is installed inside the barrel, and one end of the heating element is connected to the junction box, which is located outside the barrel. The inlet is connected to the air outlet of the fan, and the outlet is connected to the denitrification tower.

[0006] A urea solution injection device is installed at the top of the denitrification tower. The urea solution injection device includes a nozzle, a spray gun rod, a cooling protective sleeve, an installation sleeve, and a spray gun body. The nozzle is connected to the front end of the spray gun rod, and the nozzle extends into the interior of the denitrification tower. The cooling protective sleeve is fitted over the outside of the spray gun rod, and the installation sleeve is fitted over the outside of the cooling protective sleeve. The spray gun body is connected to the rear end of the spray gun rod. A first air inlet and a liquid inlet are provided on the spray gun body, and a second air inlet is provided on the spray gun rod. The first air inlet and the second air inlet are connected to an air compressor through a pressure pipe, and the liquid inlet is connected to a urea solution storage tank through a solution pipe.

[0007] Furthermore, it also includes a pressure transmitter, which is disposed in the pressure tube.

[0008] Furthermore, a second temperature transmitter is installed at the top of the denitrification tower, near the nozzle.

[0009] Furthermore, a discharge pipe is connected to the bottom of the denitrification tower, and a third temperature transmitter is installed on the discharge pipe.

[0010] Furthermore, an interlock start / stop controller is provided between the first temperature transmitter, the second temperature transmitter, and the third temperature transmitter and the electric heater.

[0011] Furthermore, the interlock start / stop controller includes a PLC controller, the signal input terminals of which are respectively connected to the first temperature transmitter, the second temperature transmitter, and the third temperature transmitter, and the signal output terminal of the PLC controller is connected to the electric heater.

[0012] Compared with existing technologies, the marine denitrification system of this utility model has the following advantages:

[0013] This utility model discloses a marine denitrification system. Through a denitrification tower, a fan, an electric heater, and a urea solution injection device, it enables the system to spray urea solution into the denitrification tower through nozzles when the ship is under low-load operating conditions. The fan and electric heater heat the air, causing the urea solution to decompose into ammonia at high temperature, thus denitrifying the ship's exhaust gas and preventing its emission. This solves the problem of excessive exhaust gas emissions under low-load operating conditions. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of the marine denitrification system described in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the electric heater structure described in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the urea solution injection device according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Ambient air; 2-Air supply branch; 3-Fan; 4-Electric heater; 5-First temperature transmitter; 6-Pressure transmitter; 7-Denitrification tower; 8-Second temperature transmitter; 10-Urea solution injection device; 11-Third temperature transmitter; 12-Solution pipe; 13-Urea solution storage tank; 14-Air compressor; 15-Pressure pipe; 16-Discharge pipe; 17-Nozzle; 18-Spray gun barrel; 19-Cooling protective sleeve; 20-Barrel body ; 21-Insulation layer; 22-Heating element; 23-Outlet; 24-Gathering box; 25-Inlet; 26-Temperature sensor; 27-Mounting sleeve; 28-Quick-release triplet; 29-Quick-release long clamp; 30-Spray gun body; 31-First air inlet; 32-Liquid inlet; 33-Second air inlet; 34-Metal hose; 35-Double-ended male threaded connector; 36-Check valve; 37-Ball valve; 38-Single-ended male threaded connector; 39-Hose gasket. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 and Figure 2 As shown, a marine denitrification system includes a denitrification tower 7, an air supply branch 2, a fan 3, an electric heater 4, and a urea solution injection device 10. The top of the denitrification tower 7 is connected to the air supply branch 2, and the end of the air supply branch 2 is connected to ambient air 1. The fan 3, the electric heater 4, and a first temperature transmitter 5 are installed on the air supply branch 2. The electric heater 4 includes a barrel 20, an insulation layer 21, a heating element 22, a junction box 24, an inlet 25, and an outlet 23. The insulation layer 21 covers the outside of the barrel 20. The inlet 25 is located on one side of the barrel 20, and the outlet 23 is located on the other side of the barrel 20. The heating element 22 is installed inside the barrel 20, and one end of the heating element 22 is connected to the junction box 24, which is located outside the barrel 20. The inlet 25 is connected to the air outlet of the fan 3, and the outlet 23 is connected to the denitrification tower 7. The fan 3 provides an air source, and the electric heater 4 heats the air source in the air supply branch 2 before sending it into the denitrification tower 7 to pyrolyze the urea.

[0023] like Figure 3As shown, a urea solution injection device 10 is installed on the upper part of the denitrification tower 7. The urea solution injection device 10 includes a nozzle 17, a spray gun rod 18, a cooling protection sleeve 19, an installation sleeve 27, and a spray gun body 30. The front end of the spray gun rod 18 is connected to the nozzle 17, and the nozzle 17 extends into the interior of the denitrification tower 7. The cooling protection sleeve 19 is fitted on the outside of the spray gun rod 18, and the installation sleeve 27 is fitted on the outside of the cooling protection sleeve 19. The rear end of the spray gun rod 18 is connected to the spray gun body 30. The spray gun body 30 is provided with a first air inlet 31 and a liquid inlet 32, and the spray gun rod 18 is provided with a second air inlet 33. The first air inlet 31 and the second air inlet 33 are connected to an air compressor 14 through a pressure pipe 15, and the liquid inlet is connected to a urea solution storage tank 13 through a solution pipe 12.

[0024] like Figure 3 As shown, when the urea solution injection device is working, the urea solution is sent into the spray gun body 30 through the solution pipe 12 and the inlet 32. The air compressor 14 generates compressed air. The first air inlet 31 is used to provide atomized compressed air. The nozzle 17 sprays atomized urea solution into the denitrification tower 7. When the urea solution injection device stops working, the second air inlet 33 is used for cooling. Compressed air is sent into the spray gun rod 18 through the second air inlet 33 to cool the spray gun rod.

[0025] Among them, nozzle 17 adopts a dual-fluid atomizing FlowMax nozzle with compressed gas and liquid as the medium to atomize the urea solution so that it can be more easily decomposed in a high-temperature environment.

[0026] like Figure 1 As shown, it also includes a pressure transmitter 6, which is disposed in the pressure tube 15. The pressure transmitter 6 is used to monitor pressure changes within the pressure tube 15.

[0027] like Figure 1 As shown, a second temperature transmitter 8 is installed on the upper part of the denitrification tower 7, near the nozzle 9. The second temperature transmitter 8 is used to collect the temperature around the nozzle 9 inside the denitrification tower 7.

[0028] like Figure 1 As shown, the bottom of the denitrification tower 7 is connected to an exhaust pipe 16, and a third temperature transmitter 11 is installed on the exhaust pipe 16. The third temperature transmitter 11 is used to collect the temperature of the air inside the exhaust pipe 16.

[0029] like Figure 1 As shown, an interlock start / stop controller is provided between the first temperature transmitter 5, the second temperature transmitter 8, and the third temperature transmitter 11 and the electric heater 4. The interlock start / stop controller controls the electric heater 4 to start or stop according to the temperature of the first temperature transmitter 5, the second temperature transmitter 8, and the third temperature transmitter 11, thereby reducing operating costs.

[0030] The interlock start / stop controller includes a PLC controller. The signal input terminals of the PLC controller are respectively connected to the first temperature transmitter 5, the second temperature transmitter 8, and the third temperature transmitter 11, and the signal output terminal of the PLC controller is connected to the electric heater 4. The PLC controller acquires the temperatures collected by the first temperature transmitter 5, the second temperature transmitter 8, and the third temperature transmitter 11. When the temperature is higher than the set value, the electric heater 4 is stopped; when the temperature is lower than the set value, the electric heater 4 is started.

[0031] like Figure 3 As shown, the first air inlet 31 and liquid inlet 32 ​​are respectively provided with a metal hose 34, a check valve 36, and a ball valve 37. The second air inlet 33 is provided with a metal hose 34 and a ball valve 37. The first air inlet 31, liquid inlet 32, and second air inlet 33 can be manually opened and closed through the ball valve 37, and the check valve 36 restricts the unidirectional entry of urea solution and compressed air into the liquid inlet 32 ​​and the first air inlet 31.

[0032] A marine denitrification system, when the ship is under low load conditions, uses a urea solution injection device to spray urea solution through nozzles into the denitrification tower. A fan and electric heater heat the air, causing the urea solution to decompose into ammonia at high temperature, thus denitrifying the ship's exhaust gas. This solves the problem of excessive exhaust gas emissions under low load conditions. Furthermore, three temperature transmitters are interlocked to start and stop the electric heater, preventing excessive urea solution injection and ammonia escape under high load conditions.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A marine denitrification system, characterized in that: The system includes a denitrification tower (7), an air supply branch (2), a fan (3), an electric heater (4), and a urea solution injection device (10). The top of the denitrification tower (7) is connected to the air supply branch (2), and the end of the air supply branch (2) is connected to the ambient air (1). The air supply branch (2) is equipped with a fan (3), an electric heater (4), and a first temperature transmitter (5). The electric heater (4) includes a barrel (20), an insulation layer (21), a heating element (22), a junction box (24), an inlet (25), and an outlet (23). The barrel is wrapped with an insulation layer (21). An inlet (25) is provided on one side of the barrel (20), and an outlet (23) is provided on the other side of the barrel (20). A heating element (22) is provided inside the barrel (20). One end of the heating element (22) is connected to the junction box (24), and the junction box (24) is located outside the barrel (20). The inlet (25) is connected to the air outlet of the fan (3), and the outlet (23) is connected to the denitrification tower (7). The upper part of the denitrification tower (7) is provided with a urea solution injection device (10). The urea solution injection device (10) includes a nozzle (17), a spray gun rod (18), a cooling protective sleeve (19), a mounting sleeve (27), and a spray gun body (30). The nozzle (17) is connected to the front end of the spray gun rod (18). The nozzle (17) extends into the interior of the denitrification tower (7). The cooling protective sleeve (19) is fitted on the outside of the spray gun rod (18). The external sleeve (27) is installed, and the rear end of the spray gun rod (18) is connected to the spray gun body (30). The spray gun body (30) is provided with a first air inlet (31) and a liquid inlet (32), and the spray gun rod (18) is provided with a second air inlet (33). The first air inlet (31) and the second air inlet (33) are connected to the air compressor (14) through the pressure pipe (15), and the liquid inlet (32) is connected to the urea solution storage tank (13) through the solution pipe (12).

2. The marine denitrification system according to claim 1, characterized in that: It also includes a pressure transmitter (6), which is disposed on the pressure tube (15).

3. The marine denitrification system according to claim 1, characterized in that: A second temperature transmitter (8) is installed on the upper part of the denitrification tower (7) and near the nozzle (17).

4. The marine denitrification system according to claim 3, characterized in that: The bottom of the denitrification tower (7) is connected to the discharge pipe (16), and a third temperature transmitter (11) is installed on the discharge pipe (16).

5. The marine denitrification system according to claim 4, characterized in that: An interlock start / stop controller is provided between the first temperature transmitter (5), the second temperature transmitter (8) and the third temperature transmitter (11) and the electric heater (4).

6. The marine denitrification system according to claim 5, characterized in that: The interlock start / stop controller includes a PLC controller. The signal input terminals of the PLC controller are respectively connected to the first temperature transmitter (5), the second temperature transmitter (8) and the third temperature transmitter (11), and the signal output terminal of the PLC controller is connected to the electric heater (4).

7. The marine denitrification system according to claim 5, characterized in that: The first air inlet (31) and liquid inlet (32) are respectively provided with a metal hose (34), a check valve (36) and a ball valve (37).

8. The marine denitrification system according to claim 5, characterized in that, The second air inlet (33) is provided with a metal hose (34) and a ball valve (37) in sequence.

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