CN115770467A - Desulphurization device and method for large ship - Google Patents
Desulphurization device and method for large ship Download PDFInfo
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- CN115770467A CN115770467A CN202211308100.1A CN202211308100A CN115770467A CN 115770467 A CN115770467 A CN 115770467A CN 202211308100 A CN202211308100 A CN 202211308100A CN 115770467 A CN115770467 A CN 115770467A
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Abstract
The invention discloses a desulfurizing device and a desulfurizing method for a large ship, and the desulfurizing device comprises a desulfurizing tower, a seawater lift pump, a flue gas heat exchanger, a rotational flow sedimentation tank and a micro bubble generator, wherein a flue gas outlet is arranged at the top of the desulfurizing tower, a liquid outlet is arranged at the bottom of the desulfurizing tower, an air inlet is arranged above the liquid outlet in the desulfurizing tower, a first spray pipe is arranged in the desulfurizing tower and close to the upper end of the air inlet, two layers of rotational flow atomizers are arranged above the first spray pipe in the desulfurizing tower, the upper layer of rotational flow atomizers are communicated with the seawater lift pump, the liquid outlet at the bottom of the desulfurizing tower is communicated with a water inlet of the rotational flow sedimentation tank, a water outlet of the rotational flow sedimentation tank is communicated with the micro bubble generator, and the micro bubble generator is respectively communicated with the lower layer of rotational flow atomizers. The invention has the advantages that the high-efficiency desulfurization effect is realized, the desulfurization rate is higher, and the wastewater is precipitated and removed and then is recycled, so that the influence on the quality of the ocean water is avoided.
Description
Technical Field
The invention relates to the technical field of ship tail gas desulfurization, in particular to a desulfurization device and a desulfurization method for a large ship.
Background
With the increase of world trade volume, ships have rapidly developed their transportation capability in the 21 st century as important transportation means. However, the exhaust gas discharged from ships contains a large amount of sulfur oxides SO 2 And nitrogen oxide NO 2 The emission of these sulfur oxides causes serious atmospheric pollution. International society and regional organizations have laws and regulations on limiting the discharge of ship pollutants. As the national emission regulation limit is more and more strict, the control on the sulfur compounds and nitrogen oxides emitted by ships is in need.
At present, the following measures are mainly adopted for controlling the sulfur content in the exhaust gas of the ship engine: 1. with low sulfur heavy oil, the use of low sulfur content fuel oil increases the operating costs of the shipping company, which is estimated to increase the fuel oil costs by more than 30%, which reduces the competitiveness of the ship's transportation in the industry. In addition to the cost of fuel oil, the fuel oil system of the whole engine needs to be modified when fuel oil with low sulfur content is used, and because parameters such as physicochemical properties, flash point, viscosity, specific gravity, calorific value and the like of high-sulfur heavy oil are different, the requirements of the two kinds of oil on the engine are different; 2. the liquefied natural gas is used as fuel, the difficulty and the cost of the modification of an engine fuel system are high, the endurance capacity is weak due to the problem of storage of the natural gas on a ship, and the existing basic facilities such as port gas filling are imperfect; 3. the installation and use of the ship engine exhaust gas desulfurization device can increase the investment cost of part of equipment, but can avoid changing an engine system, has much lower operation cost compared with the replacement of low-sulfur heavy oil, and has good economical efficiency.
The seawater desulfurization process is a desulfurization method for removing sulfur dioxide and sulfur trioxide in flue gas by using the alkalinity of seawater. In the traditional process, in a desulfurization absorption tower, a large amount of seawater is sprayed and washed to enter the absorption tower containing flue gas, sulfur dioxide and sulfur trioxide in the flue gas are removed by seawater absorption, the purified flue gas is demisted by a demister and is heated by a flue gas heat exchanger and then is discharged, and wastewater generated by desulfurization can be directly discharged into the sea. The treatment effect of flue gas among the prior art is unsatisfactory, and the direct sea of discharging of waste water causes very big harm to ocean quality of water simultaneously.
Disclosure of Invention
The invention aims to provide a desulfurization device and a desulfurization method for a large ship, which have the advantages that the desulfurization efficiency is higher while the high-efficiency desulfurization effect is realized, and meanwhile, the wastewater is recycled after being precipitated and removed, so that the influence on the quality of ocean water is avoided.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a desulphurization unit for large vessel, a serial communication port, including desulfurizing tower, sea water elevator pump, gas heater, whirl sedimentation tank and microbubble generator, the desulfurizing tower top is provided with the exhanst gas outlet, and the bottom is provided with the leakage fluid dram, the desulfurizing tower is inside to be provided with an air inlet in the leakage fluid dram top, the air inlet communicates with the air current section of gas heater, the inside air inlet upper end that is close to of desulfurizing tower is provided with first shower, first shower is connected with the agitator tank, agitator tank front end and gas heater's liquid stream section intercommunication, the desulfurizing tower is inside to be provided with two-layer whirl atomizer in first shower top, upper strata whirl atomizer and sea water elevator pump intercommunication, desulfurizing tower bottom leakage fluid dram and whirl sedimentation tank's water inlet intercommunication, whirl sedimentation tank's delivery port and microbubble generator intercommunication, microbubble generator communicates respectively with the whirl atomizer of lower floor, the desulfurizing tower is inside to be provided with the medium in the atomizer top and blocks low temperature plasma reactor, the medium blocks the plasma reactor top and is provided with the second shower, the second shower is connected with the desulfurizing tower outside the whirl feeding portion the desulfurizing tower in the exhanst gas heater outlet department, the desulfurizing tower below is provided with the draught fan.
Preferably, a plurality of spray headers are distributed on the first spray pipe and the second spray pipe at equal intervals.
Preferably, each layer of the cyclone atomizer is provided with eight groups, and the eight groups of the cyclone atomizers are arranged in the tangent circle direction on the inner wall of the desulfurizing tower.
Preferably, an electric stirrer is arranged in the stirring tank, and a temperature detector, a first stop valve and a feeding pump are arranged on a pipeline connecting the first spraying pipe and the stirring tank.
Preferably, a second stop valve is arranged at the communication position of the air inlet and the air flow section of the flue gas heat exchanger, and a third stop valve is arranged between the feed pump and the second spray pipe.
Preferably, the inlet of the seawater lift pump is communicated with the sea surface of the ship, a replaceable filter is further arranged at the inlet of the seawater lift pump, and a fourth stop valve is further arranged between the seawater lift pump and the upper cyclone atomizer.
Preferably, microbubble generator one end still is connected with ozone generator, be provided with the fifth stop valve between the whirl atomizer of microbubble generator and lower floor.
Preferably, be provided with the aeration pipe in the whirl sedimentation tank, aeration pipe and ozone generator intercommunication, the aeration direction of aeration pipe is tangent circle direction setting in whirl sedimentation tank inner wall, whirl sedimentation tank bottom sets up the precipitation tank, be provided with electronic defeated material screw rod in the precipitation tank, whirl sedimentation tank one side is provided with the bin outlet in electronic defeated material screw rod exit end, bin outlet department is provided with electronic gate valve, be provided with the baffle in keeping away from aeration pipe one side in the whirl sedimentation tank, separate in keeping away from the aeration pipe opposite side through the baffle in the whirl sedimentation tank and be provided with pipe chute clarification district, pipe chute clarification district and whirl sedimentation tank bottom intercommunication, be provided with two sets of pipe chutes of putting opposite direction in the pipe chute clarification district, the pipe chute angle of inclination is 60, the delivery port sets up in pipe chute clarification district top.
A seawater desulfurization method for a large ship, characterized by comprising the steps of:
step 1: firstly, opening a second stop valve and a fourth stop valve, and allowing flue gas generated by a ship to enter a desulfurizing tower to be in contact with seawater output by a cyclone atomizer for cooling so as to realize primary treatment;
and 2, step: starting the dielectric barrier low-temperature plasma reactor to release low-temperature plasma, simultaneously starting a feed pump, spraying ethanolamine from the upper part of the dielectric barrier low-temperature plasma reactor through a second spraying pipe by the feed pump, and realizing desulfurization reaction on flue gas by combining ethanolamine and a plasma environment;
and step 3: when the flue gas heat exchanger reaches a preset working temperature, introducing a water body, performing exchange heating on the water body through the flue gas heat exchanger, then introducing the water body into a stirring tank, adding urea while stirring in the stirring tank, and when the urea solution reaches a preset initial temperature, opening a first stop valve to perform heat exchange with high-temperature flue gas at an air inlet through a feed pump and realize hydrolysis, so that the high-temperature flue gas is treated;
and 4, step 4: the water at the bottom of the desulfurization tower is discharged into a cyclone sedimentation tank, ozone in an aeration pipe enters the cyclone sedimentation tank in a cyclone mode, so that water flow in the tank generates transverse cyclone vertical to main flow, the precipitate in the water body is further sunk into a sedimentation tank, the water body is subsequently discharged from a discharge port through an electric material conveying screw rod, the water body entering an inclined pipe clarification zone is subsequently formed with the ozone to form a water body containing micro-bubble ozone, and the water body enters a desulfurization tower for further desulfurization treatment;
and 5: and the flue gas after various treatment processes is discharged to the outside of the desulfurizing tower through the induced draft fan after passing through the demister.
Preferably, the medium blocks the low-temperature plasma reactor in step 2The discharge current is controlled to be 0.83 to 4.16A, the discharge voltage is controlled to be 0 to 20Kv, the discharge frequency is 8.7kHz to 11.0kHz, the discharge power is controlled to be 8 to 90W, and the feeding speed of the ethanolamine is controlled to be 2 to 3m 3 /h。
In conclusion, the invention has the following beneficial effects:
1. according to the invention, urea in an aqueous solution state is contacted with high-temperature flue gas in a spraying state, the urea is dissolved and converted into a part of solid urea and water vapor, the solid urea is pyrolyzed and hardened at a high temperature, the solid urea is rapidly converted into a mixture of ammonia and isohydric acid, the mixture appears in a gas mode, the state is extremely stable, the isohydric acid reacts with the water vapor in the mixture to generate ammonia, and the ammonia can rapidly generate a primary desulfurization effect on the flue gas.
2. The method of the invention utilizes a pulse high-voltage power supply to generate high-energy electrons in a reactor and H in waste gas 2 O、O 2 、N 2 After the molecules collide, high-activity free radicals are generated, and the substances and SO in tail gas 2 And the gaseous pollutants react to achieve the aim of removing.
3. According to the invention, ozone is introduced into the water body after the desulfurization treatment is finished to carry out rotational flow precipitation, and then the ozone generates micro bubbles, so that the bubble space in the micro bubble solution can generate various active free radicals (hydroxyl ions, active oxygen ions, hydrogen ions and the like), wherein the hydroxyl ions have super-strong oxidizing capability, thereby generating a certain desulfurization capability.
4. The invention realizes the high-efficiency desulfurization of the flue gas, and simultaneously, the wastewater is recycled after being precipitated and removed, thereby avoiding the influence on the quality of the ocean water.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the distribution of each layer of swirl atomizers of the invention;
fig. 3 is a schematic view of the internal structure of the cyclone sedimentation tank in the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings, and the present embodiment is not to be construed as limiting the invention.
As shown in fig. 1 to 3, a desulphurization unit for large vessel, including desulfurizing tower 1, sea water elevator pump 2, gas heater 3, whirl sedimentation tank 4 and microbubble generator 5, desulfurizing tower 1 top is provided with exhanst gas outlet 6, the bottom is provided with leakage fluid dram 7, desulfurizing tower 1 is inside to be provided with an air inlet 8 in leakage fluid dram 7 top, air inlet 8 communicates with gas heater 3's air current section, desulfurizing tower 1 is inside to be provided with first shower 9 near air inlet 8 upper end, first shower 9 is connected with agitator tank 10, agitator tank 10 front end and gas heater 3's liquid current section intercommunication, desulfurizing tower 1 is inside to be provided with two-layer whirl atomizer 11 in first shower 9 top, upper strata whirl atomizer 11 communicates with sea water elevator pump 2 respectively, desulfurizing tower 1 bottom leakage fluid dram 7 communicates with whirl sedimentation tank 4's water inlet, whirl sedimentation tank 4's delivery port communicates with microbubble generator 5, microbubble generator 5 communicates with lower floor's whirl atomizer 11 respectively, desulfurizing tower 1 is inside to be provided with medium barrier plasma reaction ware 12 in whirl atomizer 11 top, low temperature plasma reaction ware 12 is provided with second spray scrubber 13 below the vortex sedimentation tank 13 and is provided with second spray 13 outside the flue gas outlet 6, desulfurizing tower 1 is provided with second spray 13.
First shower 9 and second shower 13 equidistance distribute has the several shower head, and every layer whirl atomizer 11 all is provided with eight groups, and eight groups whirl atomizer 11 are tangent circle direction setting in 1 inner wall of desulfurizing tower, and the whirl atomizes more comprehensively, and the gas-liquid mixture effect is higher, promotes holistic reaction degree.
An electric stirrer is arranged in the stirring tank 10, a temperature detector 17, a first stop valve 18 and a feed pump 19 are arranged on a pipeline connecting the first spraying pipe 9 and the stirring tank 10, a second stop valve 20 is arranged at the position where the air inlet 8 is communicated with the air flow section of the flue gas heat exchanger 3, a third stop valve 21 is arranged between the feed pump 14 and the second spraying pipe 13, the inlet of the seawater lifting pump 2 is communicated with the sea surface of the ship, a replaceable filter 22 is further arranged at the inlet of the seawater lifting pump 2, a fourth stop valve 23 is further arranged between the seawater lifting pump 2 and the upper-layer cyclone atomizer 11, one end of the micro-bubble generator 5 is further connected with an ozone generator 24, and a fifth stop valve 25 is arranged between the micro-bubble generator 5 and the lower-layer cyclone atomizer 11.
The aeration pipe 26 is arranged in the cyclone sedimentation tank 4, the aeration pipe 26 is communicated with the ozone generator 24, the aeration direction of the aeration pipe 26 is arranged in the tangential direction on the inner wall of the cyclone sedimentation tank 4, the bottom of the cyclone sedimentation tank 4 is provided with the sedimentation tank 27, the electric conveying screw 28 is arranged in the sedimentation tank 27, one side of the cyclone sedimentation tank 4 is provided with a discharge port 29 at the outlet end of the electric conveying screw 28, the discharge port 29 is provided with an electric gate valve 30, one side of the cyclone sedimentation tank 4, which is far away from the aeration pipe 26, is provided with a partition plate 31, the other side of the aeration pipe 26 is separated and provided with an inclined pipe clarification zone through the partition plate 31, the inclined pipe clarification zone is communicated with the bottom of the cyclone sedimentation tank 4, two groups of inclined pipes 32 with opposite placing directions are arranged in the inclined pipe clarification zone, the inclination angle of the inclined pipe 32 is 60 degrees, a water outlet is arranged above the inclined pipe clarification zone, the produced sediment is transported to the discharge port 29 through the electric conveying screw 28 and then discharged, the subsequent water body passes through the two groups of the inclined pipe clarification zones, the flow velocity of the water body is greatly reduced, the water body impurity produced to the maximum degree, and the micro bubble reaction water body is formed by micro bubbles.
A seawater desulfurization method for a large-sized ship, comprising the steps of:
step 1: at first, open second stop valve 20 and fourth stop valve 23, the flue gas that boats and ships produced gets into in desulfurizing tower 1 and carries out the contact cooling with the sea water of whirl atomizer 11 output and realize preliminary treatment, and sea water whirl atomizing system desulfurization effect is higher, and the pressure drop of operation is low, can effectively reduce the area of desulfurizing tower to better anti load fluctuation ability has.
And 2, step: opening the dielectric barrier low-temperature plasma reactor 12 to realize the release of low-temperature plasma, wherein the discharge current of the dielectric barrier low-temperature plasma reactor 12 is controlled to be 0.83 to 4.16A, the discharge voltage is 0 to 20Kv, the discharge frequency is 8.7kHz to 11.0kHz, the discharge power is 8 to 90W, the feeding speed of ethanolamine is 2 to 3m 3 H, simultaneously starting a feeding pump 14, wherein the feeding pump 14 enables the ethanolamine to pass through a second spraying pipe 13 and is low in medium barrierSpraying above the warm plasma reactor 12, combining ethanolamine with plasma environment to realize desulfurization reaction on flue gas, generating high-energy electrons in the reactor 12 by using a pulse high-voltage power supply, and mixing with H in the waste gas 2 O、O 2 、N 2 After the molecules collide, high-activity free radicals are generated, and the substances and SO in tail gas 2 And the gaseous pollutants react to achieve the aim of removing.
And step 3: treat that gas heater 3 reaches when predetermineeing operating temperature, let in the water, the water gets into in agitator tank 10 after gas heater 3 exchange heating, add urea in agitator tank 10 while stirring, when urea solution reaches predetermined initial temperature, open first stop valve 18 and carry out the heat exchange and realize hydrolysising through the high temperature flue gas of charge pump 19 with air inlet 8 department, thereby handle high temperature flue gas, urea under the aqueous solution state contacts with high temperature flue gas under the spray regime, urea dissolves turns into partly solid-state urea and vapor, solid-state urea takes place the pyrolysis hardening at high temperature, thereby solid-state urea turns into the mixture of ammonia and isohydric acid fast, and this mixture then appears with the mode of gas, the state is very stable, the isohydric acid then takes place the reaction with vapor wherein and produces the ammonia, the ammonia then can produce preliminary desulfurization effect to the flue gas fast.
And 4, step 4: the water at the bottom of the desulfurizing tower 1 is discharged into the cyclone sedimentation tank 4, ozone in the aeration pipe 26 enters the cyclone sedimentation tank 4 in a cyclone mode, so that water flow in the tank generates transverse cyclone perpendicular to main flow, then sediment in the water is precipitated into the sedimentation tank 27, the water is discharged from the discharge port 29 through the electric material conveying screw 28 subsequently, the water entering the inclined pipe clarification zone forms a water body containing micro-bubble ozone with the ozone and enters the desulfurizing tower 1 for further desulfurization treatment, the water after the desulfurization treatment is introduced into the ozone for cyclone sedimentation, then the ozone generates micro-bubbles, the bubble space in the micro-bubble solution can generate various active free radicals (hydroxyl ions, active oxygen ions, hydrogen ions and the like), the hydroxyl ions have super-strong oxidizing capability, and certain desulfurizing capability is generated.
And 5: the flue gas after various treatment processes is discharged to the outside of the desulfurizing tower 1 through the induced draft fan 15 after passing through the demister 16.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a desulphurization unit for large vessel, a serial communication port, including desulfurizing tower, sea water elevator pump, gas heater, whirl sedimentation tank and microbubble generator, the desulfurizing tower top is provided with the exhanst gas outlet, and the bottom is provided with the leakage fluid dram, the desulfurizing tower is inside to be provided with an air inlet in the leakage fluid dram top, the air inlet communicates with the air current section of gas heater, the inside air inlet upper end that is close to of desulfurizing tower is provided with first shower, first shower is connected with the agitator tank, agitator tank front end and gas heater's liquid stream section intercommunication, the desulfurizing tower is inside to be provided with two-layer whirl atomizer in first shower top, upper strata whirl atomizer and sea water elevator pump intercommunication, desulfurizing tower bottom leakage fluid dram and whirl sedimentation tank's water inlet intercommunication, whirl sedimentation tank's delivery port and microbubble generator intercommunication, microbubble generator communicates respectively with the whirl atomizer of lower floor, the desulfurizing tower is inside to be provided with the medium in the atomizer top and blocks low temperature plasma reactor, the medium blocks the plasma reactor top and is provided with the second shower, the second shower is connected with the desulfurizing tower outside the whirl feeding portion the desulfurizing tower in the exhanst gas heater outlet department, the desulfurizing tower below is provided with the draught fan.
2. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: and a plurality of spray heads are distributed on the first spray pipe and the second spray pipe at equal intervals.
3. The desulfurization apparatus for a large vessel according to claim 1, wherein: every layer whirl atomizer all is provided with eight groups, eight groups whirl atomizer is in the desulfurizing tower inner wall be tangent circle direction setting.
4. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: an electric stirrer is arranged in the stirring tank, and a temperature detector, a first stop valve and a feeding pump are arranged on a pipeline connecting the first spraying pipe and the stirring tank.
5. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: and a second stop valve is arranged at the communication position of the air inlet and the air flow section of the flue gas heat exchanger, and a third stop valve is arranged between the feed pump and the second spray pipe.
6. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: the inlet of the seawater lifting pump is communicated with the sea surface of the ship, the inlet of the seawater lifting pump is further provided with a replaceable filter, and a fourth stop valve is further arranged between the seawater lifting pump and the upper cyclone atomizer.
7. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: microbubble generator one end still is connected with ozone generator, be provided with the fifth stop valve between the whirl atomizer of microbubble generator and lower floor.
8. A desulfurization apparatus for a large-sized ship according to claim 1, characterized in that: be provided with the aeration pipe in the whirl sedimentation tank, aeration pipe and ozone generator intercommunication, the aeration direction of aeration pipe is tangent circle direction setting in whirl sedimentation tank inner wall, whirl sedimentation tank bottom sets up the precipitation tank, be provided with electronic defeated material screw rod in the precipitation tank, whirl sedimentation tank one side is provided with the bin outlet in electronic defeated material screw rod exit end, bin outlet department is provided with electronic gate valve, be provided with the baffle in keeping away from aeration pipe one side in the whirl sedimentation tank, separate in keeping away from the aeration pipe opposite side through the baffle in the whirl sedimentation tank and be provided with pipe chute clarification district, pipe chute clarification district and whirl sedimentation tank bottom intercommunication, be provided with two sets of pipe chutes of putting opposite direction in the pipe chute clarification district, the pipe chute angle of inclination is 60, the delivery port sets up in pipe chute clarification district top.
9. A method of seawater desulfurization for large vessels according to claims 1 to 8, characterized by comprising the steps of:
step 1: firstly, opening a second stop valve and a fourth stop valve, and allowing flue gas generated by a ship to enter a desulfurizing tower to be in contact with seawater output by a cyclone atomizer for cooling so as to realize primary treatment;
step 2: starting the dielectric barrier low-temperature plasma reactor to release low-temperature plasma, simultaneously starting a feed pump, spraying ethanolamine from the upper part of the dielectric barrier low-temperature plasma reactor through a second spraying pipe by the feed pump, and realizing desulfurization reaction on flue gas by combining ethanolamine and a plasma environment;
and step 3: when the flue gas heat exchanger reaches a preset working temperature, introducing a water body, performing exchange heating on the water body through the flue gas heat exchanger, then introducing the water body into a stirring tank, adding urea while stirring in the stirring tank, and when the urea solution reaches a preset initial temperature, opening a first stop valve to perform heat exchange with high-temperature flue gas at an air inlet through a feed pump and realize hydrolysis, so that the high-temperature flue gas is treated;
and 4, step 4: discharging water at the bottom of the desulfurization tower into a cyclone sedimentation tank, and allowing ozone in an aeration pipe to enter the cyclone sedimentation tank in a cyclone mode, so that water flow in the tank generates a transverse cyclone vertical to a main flow, and further precipitating precipitates in water into a sedimentation tank, and then discharging the water from a discharge port through an electric material conveying screw rod, wherein the water entering an inclined pipe clarification zone subsequently forms a water body containing microbubble ozone with the ozone and enters a desulfurization tower for further desulfurization treatment;
and 5: and the flue gas after various treatment processes is discharged to the outside of the desulfurizing tower through the induced draft fan after passing through the demister.
10. A desulfurization apparatus for a large-sized ship according to claim 9, characterized in that: in the step 2, the discharge current of the low-temperature plasma reactor is controlled to be 0.83 to 4.16A by the medium barrier, the discharge voltage is 0 to 20Kv, the discharge frequency is 8.7kHz to 11.0kHz, the discharge power is 8 to 90W, and the feeding speed of ethanolamine is 2 to 3m 3 /h。
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| CN202211308100.1A CN115770467A (en) | 2022-10-25 | 2022-10-25 | Desulphurization device and method for large ship |
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| CN202211308100.1A CN115770467A (en) | 2022-10-25 | 2022-10-25 | Desulphurization device and method for large ship |
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