Marine ammonia gas washing tower device

Abstract

The invention discloses an ammonia gas washing tower device for a ship. The ammonia gas washing tower device comprises a washing tower body, an ammonia gas water absorption tank, a first-stage gas uniform distributor, a first-stage spraying pipe network, a second-stage gas uniform distributor, a second-stage spraying pipe network, a ventilation device, a first spraying seawater valve, a second spraying seawater valve, an ammonia gas sensor, an exhaust control valve, a pressure sensor and an exhaust pipe. According to the marine ammonia gas washing tower device, the characteristic that ammonia is extremely easy to dissolve in water is utilized, and effective ammonia gas treatment and absorption are provided for a diesel / ammonia dual-fuel power ship; the ammonia gas treatment capacity is large, and ammonia gas generated in exhaust of a diesel / ammonia dual-fuel main engine and ammonia gas discharged by a safety valve of a liquid ammonia tank can be treated; a lower concentration value can be set by adjusting the concentration monitoring range of the ammonia gas sensor, so that the ammonia gas emission can be further controlled, and even the zero emission target of the ammonia gas can be realized; the mixed gas of ammonia gas and other gases can be treated, and other water-soluble gases are discharged into the atmosphere after being washed.

Description

Technical Field

[0001] The invention relates to the field of ammonia emission control of diesel / ammonia dual-fuel internal combustion engine ships, and in particular to a marine ammonia scrubber device. Background Art

[0002] At present, with the increasing construction and operation of diesel / ammonia dual-fuel internal combustion engine ships, ammonia emissions will inevitably occur when the ammonia-related system is in operation. Ammonia is a toxic gas, so it needs to be treated and purified. In this case, the ship needs an efficient and reliable ammonia treatment equipment that can absorb, dilute, burn, oxidize / catalyze or wash the ammonia or a mixture of ammonia and inert gas produced by the system to meet the emission standards, that is, below 30ppm or lower, and then discharge it into the atmosphere. Summary of the invention

[0003] The object of the present invention is to provide a marine ammonia scrubber device for use in diesel / ammonia dual-fuel internal combustion engine ships, so as to reduce the ammonia concentration discharged from the system to below 30 ppm.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a marine ammonia scrubber device, comprising a scrubber body (1), an ammonia water absorption tank (2), a first-stage gas distributor (3), a first-stage spray pipe network (4), a second-stage gas distributor (5), a second-stage spray pipe network (6), a venting device (7), a first spray seawater valve (8), a second spray seawater valve (9), an ammonia sensor (10), an exhaust control valve (11), a pressure sensor (12) and an exhaust pipe (13), wherein the ammonia water absorption tank (2), the first-stage gas distributor (3), the first-stage spray pipe network (4), the second-stage gas distributor (5) and the second-stage spray pipe network (6) are located in the washing tower body (1) and are installed in sequence from the bottom to the top. The first spray seawater valve (8) is installed on the outside of the washing tower body (1) at a position corresponding to the first-stage spray pipe network (4). The second spray seawater valve (9) is installed on the outside of the washing tower body (1) at a position corresponding to the second-stage spray pipe network (6). The pressure sensor (12) and the exhaust pipe (13) are respectively installed on the top of the outside of the washing tower body (1). The ammonia sensor (10) and the exhaust control valve (11) are respectively installed on the exhaust pipe (13). The air permeability device (7) is installed on the top of the exhaust pipe (13). The ammonia water absorption tank (2) is provided with an overflow port (15).

[0005] The ventilation device (7) is provided with a fireproof net.

[0006] A heating pipe (14) is installed at the bottom of the ammonia water absorption tank (2).

[0007] An observation mirror (16) is installed in the ammonia water absorption tank (2).

[0008] A low liquid level alarm device (17) is installed in the ammonia water absorption tank (2).

[0009] The invention discloses a marine ammonia scrubber device. By utilizing the characteristic that ammonia is very soluble in water, the device provides effective ammonia treatment and absorption for diesel / ammonia dual-fuel powered ships. The device has a large ammonia treatment capacity and can treat ammonia in the exhaust gas of a diesel / ammonia dual-fuel main engine and ammonia discharged from a liquid ammonia tank safety valve. The device can further control ammonia emission and even achieve the goal of zero ammonia emission by adjusting the concentration monitoring range of an ammonia sensor and setting a lower concentration value. The device can treat a mixed gas of ammonia and other gases, such as gas in a main engine crankcase or a nitrogen / ammonia mixture, and discharge other water-soluble gases into the atmosphere after washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a structural schematic diagram of a marine ammonia scrubbing tower device.

[0011] In the figure: 1. Scrubber body; 2. Ammonia water absorption tank; 3. First-stage gas distributor; 4. First-stage spray pipe network; 5. Second-stage gas distributor; 6. Second-stage spray pipe network; 7. Ventilation device; 8. First spray seawater valve; 9. Second spray seawater valve; 10. Ammonia sensor; 11. Exhaust control valve; 12. Pressure sensor; 13. Exhaust pipe; 14. Heating pipe; 15. Overflow port; 16. Observation mirror; 17. Low liquid level alarm device. DETAILED DESCRIPTION

[0012] like Figure 1As shown, the marine ammonia scrubber device utilizes the characteristic that ammonia is very soluble in water, that is, at normal temperature and pressure, 1 volume of water can dissolve about 700 volumes of ammonia. Seawater is sprayed in the device so that ammonia is absorbed by the seawater to achieve the purpose of purification. The device includes a scrubber body 1, an ammonia water absorption tank 2, a first-stage gas distributor 3, a first-stage spray pipe network 4, a second-stage gas distributor 5, a second-stage spray pipe network 6, a ventilation device 7, a first spray seawater valve 8, a second spray seawater valve 9, an ammonia sensor 10, an exhaust control valve 11, a pressure sensor 12 and an exhaust pipe 13, an ammonia water absorption tank 2, a first-stage gas distributor 3, a first-stage spray pipe network 4, a second-stage gas distributor 5, a second-stage spray pipe network 6, a ventilation device 7, a first spray seawater valve 8, a second spray seawater valve 9, an ammonia sensor 10, an exhaust control valve 11, a pressure sensor 12 and an exhaust pipe 13, an ammonia water absorption tank 2, a first-stage gas distributor 3, a first-stage spray pipe network 4, a second-stage gas distributor 5 The first spray seawater valve 8 is installed on the outside of the washing tower body 1 at the position corresponding to the first spray pipe network 4, and the second spray seawater valve 9 is installed on the outside of the washing tower body 1 at the position corresponding to the second spray pipe network 6. The pressure sensor 12 and the exhaust pipe 13 are respectively installed on the top of the outside of the washing tower body 1, the ammonia sensor 10 and the exhaust control valve 11 are respectively installed on the exhaust pipe 13, the ventilation device 7 is installed on the top of the exhaust pipe 13, the ammonia water absorption tank 2 is provided with an overflow port 15, and the ventilation device 7 is provided with a fireproof net. A heating pipe 14 is installed at the bottom of the ammonia water absorption tank 2, and an observation The mirror 16 is used for daily on-site observation of the liquid situation in the ammonia water absorption tank 2. A low liquid level alarm device 17 is installed in the ammonia water absorption tank 2 for remote monitoring of the liquid situation in the ammonia water absorption tank 2. A certain water level needs to be maintained, and an alarm is issued when the liquid level is low. The ammonia water absorption tank 2 of the ammonia scrubber receives ammonia discharged from various ammonia discharge points of the system, such as the exhaust gas of the liquid ammonia tank pressure release device, the ammonia of the closed liquid ammonia ammonia pipe section, and the ammonia discharged by equipment purging, etc. After entering the rear scrubber body 1, the ammonia flows through the first-stage gas distributor 3, and the first-stage spray pipe network 4 above the distributor sprays seawater for the first-stage absorption. After the ammonia is absorbed, it enters the second-stage gas distributor 5. The second-stage spray pipe network 6 sprays relatively fine seawater or fresh water. After the ammonia is sprayed and absorbed by the two-stage spray pipe network, the gas enters the exhaust pipe 13 and is then discharged to the atmosphere through the ventilation device 7; the waste liquid generated by washing freely falls into the ammonia water absorption pool 2 at the bottom of the washing tower body 1, and is discharged through the discharge pipe at the bottom of the pool. At the same time, an overflow port 15 is set at the top of the pool to discharge excess waste liquid. A heating pipe 14 is installed at the bottom of the ammonia water absorption pool 2, and steam is heated to prevent the ammonia waste liquid at the bottom of the ammonia water absorption pool from freezing; the washing tower device provides temperature, pressure, liquid level, ammonia concentration monitoring instruments, and automatic control valves, which can remotely and locally start and operate the equipment, and monitor and alarm output;An ammonia sensor and an exhaust control valve are installed on the top of the scrubber body. They are normally closed. The ammonia sensor monitors the ammonia concentration in the gas. When it is higher than 30ppm, the system sprays water through the spray pipe network to treat the excess gas. When the ammonia concentration continues to rise, a control signal is issued to increase the amount of seawater / fresh water sprayed to further absorb and wash the ammonia. When the ammonia content is lower than 30ppm and the top pressure sensor is greater than 1.5 barg, the exhaust control valve is opened to discharge the treated exhaust gas. ;

[0013] During operation, after the installation of the washing tower device is completed, seawater or a water-ethylene glycol mixture is first injected into the ammonia water absorption tank 2 at the bottom of the tower until the specified liquid level is reached. Ammonia discharged from the ammonia-containing pipeline, pressure vessel or internal combustion engine exhaust pipe on board is discharged into the absorption tank from the inlet of the ammonia water absorption tank 2 at the bottom of the washing tower body 1. After entering the absorption tank, ammonia will be absorbed by the seawater or water-ethylene glycol solution in the tank. In the pure ammonia state, no additional gas will be generated after being absorbed by water. As the ammonia emission increases or pressure fluctuations occur, some ammonia will overflow from the absorption tank and accumulate at the top of the tower. The top ammonia sensor 10 detects the ammonia concentration and monitors it. When the ammonia sensor 10 detects that the ammonia concentration is higher than 30ppm, the ammonia detection system outputs a valve opening signal to the first spray seawater valve 8 of the first-stage spray pipe network 4 to provide spray seawater. Seawater is sprayed from the nozzle to treat excess gas. When the ammonia concentration continues to increase, such as reaching 300ppm, the ammonia detection system outputs a valve opening signal to the second spray seawater valve 9 of the second-stage spray pipe network 6. Seawater is discharged from the nozzle to treat excess gas. The nozzle sprays out to further absorb and wash ammonia. After the ammonia content of the ammonia sensor 10 is lower than 30ppm, the first spray seawater valve 8 and the second spray seawater valve 9 are closed, and the top ammonia exhaust control valve 11 is opened to discharge the treated gas. When the gas discharged to the ammonia water absorption tank 2 contains other gases, if it is insoluble in water, it will directly overflow and accumulate at the top. If the ammonia concentration alarm is not detected, under the feedback of the pressure sensor 12, for example, when it reaches 1.5barg, the exhaust control valve 11 is opened to exhaust. In order to improve the spray absorption effect, a two-stage gas distributor is set in the tower to evenly distribute the gas. An exhaust device 7 (with a fireproof net) is set at the end of the tower top exhaust pipe 13 to further eliminate safety hazards. The marine ammonia scrubber device of the present invention is mainly used for ammonia emission control of diesel / ammonia dual-fuel internal combustion engine ships. In the normal operation state of the ship and the fault state of fuel leakage, it is used to absorb and clean the discharged ammonia, and discharge it into the atmosphere after the ammonia depth reaches below 30ppm.

Claims

1. A marine ammonia scrubber device, characterized in that: The invention comprises a washing tower body (1), an ammonia water absorption tank (2), a first-stage gas distributor (3), a first-stage spray pipe network (4), a second-stage gas distributor (5), a second-stage spray pipe network (6), a ventilation device (7), a first spray seawater valve (8), a second spray seawater valve (9), an ammonia sensor (10), an exhaust control valve (11), a pressure sensor (12) and an exhaust pipe (13), wherein the ammonia water absorption tank (2), the first-stage gas distributor (3), the first-stage spray pipe network (4), the second-stage gas distributor (5) and the second-stage spray pipe network (6) are located in the washing tower body (1) and are connected by the bottom The first spray seawater valve (8) is installed on the outside of the washing tower body (1) at a position corresponding to the first-stage spray pipe network (4), the second spray seawater valve (9) is installed on the outside of the washing tower body (1) at a position corresponding to the second-stage spray pipe network (6), the pressure sensor (12) and the exhaust pipe (13) are respectively installed on the top of the outside of the washing tower body (1), the ammonia sensor (10) and the exhaust control valve (11) are respectively installed on the exhaust pipe (13), the ventilation device (7) is installed on the top of the exhaust pipe (13), and the ammonia water absorption tank (2) is provided with an overflow port (15).

2. A marine ammonia scrubber device according to claim 1, characterized in that: The ventilation device (7) is provided with a fireproof net.

3. A marine ammonia scrubber device according to claim 1, characterized in that: A heating pipe (14) is installed at the bottom of the ammonia water absorption tank (2).

4. A marine ammonia scrubber device according to claim 3, characterized in that: An observation mirror (16) is installed in the ammonia water absorption tank (2).

5. A marine ammonia scrubber device according to claim 4, characterized in that: A low liquid level alarm device (17) is installed in the ammonia water absorption tank (2).

Images