CN112316721A - Large-scale ship combined type desulfurization device and desulfurization method - Google Patents
Large-scale ship combined type desulfurization device and desulfurization method Download PDFInfo
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- CN112316721A CN112316721A CN202011245127.1A CN202011245127A CN112316721A CN 112316721 A CN112316721 A CN 112316721A CN 202011245127 A CN202011245127 A CN 202011245127A CN 112316721 A CN112316721 A CN 112316721A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
Abstract
The invention discloses a large-scale ship combined type desulfurization device and a desulfurization method, which are composed of a closed desulfurization circulation loop and an open desulfurization circulation loop; wherein, one path of seawater is led to the circulating water tank through the seawater supply pump, and the other path of seawater is discharged to the outboard through the circulating water cooler; the alkali liquor cabin is communicated with the circulating water cabin, one path of cleaning liquid of the circulating water cabin respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower through the circulating water cooler, and the other path of cleaning liquid of the circulating water cabin is communicated with the water treatment unit; cleaning liquid of the desulfurizing tower is led to the circulating water cabin through a liquid outlet; one path of the cleaning liquid of the water treatment unit is communicated to the sewage tank, the other path is communicated to the zero-emission tank, and the cleaning liquid can be recycled and returned to the circulating water tank to form a closed desulfurization circulating loop; seawater respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower through a seawater supply pump and is discharged to the outside of a ship board through a liquid outlet, so that an open desulfurizing circulation loop is formed. The invention utilizes the space and the structure of the ship, reduces the cost, simplifies the process and improves the safety factor.
Description
Technical Field
The invention relates to the technical field of ship equipment, in particular to a large-scale ship combined type desulfurization device and a desulfurization method.
Background
IMO MEPC meeting 70 passes global sea sulfur emission regulations: after 1 month and 1 day of 2020, the sulfur content of any fuel used on the ship should not exceed 0.5%.
In recent years, flue gas desulfurization devices have been widely accepted in the industry and are one of the flue gas desulfurization methods approved by IMO. The method enables the ship to continue to use common low-price heavy fuel oil with 3.5% of conventional sulfur content, thereby not only effectively reducing the operating cost of the ship (because a certain gap exists in the supply of low-sulfur fuel oil in the current marine fuel oil market, a large number of ships are queued to wait for refitting a flue gas desulfurization device); and the low-quality influence brought by low-sulfur fuel oil (for example, the diesel engine cylinder sleeve is abraded due to the fact that the oil is rich in catalyst particles, the compatibility of low-sulfur oil in different batches is poor, and the like) can be effectively avoided. The fuel consumption of large ships is large, such as 2 ten thousand-box large ships, about 220 tons can be reached in 1 day under the full-speed navigation condition, and the economic benefit is more obvious if the conventional common low-price heavy fuel oil with 3.5% of sulfur content is used.
However, the flue gas desulfurization process of the combined type desulfurization tower needs to use corrosive cleaning solution (such as NaOH and MgOH), and the waste water generated after the flue gas cleaning is strong in acidity; the existing classification society feeds back that ship corrosion and other phenomena occur after a flue gas desulfurization device is operated by a ship, and more port authorities refuse the ship to discharge waste water generated by flue gas desulfurization.
Therefore, how to isolate the corrosive medium, how to quickly find out the corrosion and take countermeasures, how to provide a large-capacity washing water storage tank without affecting the cargo loading and performance of the ship, and how to effectively reduce the cost become the difficulties which need to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a large-scale ship combined type desulfurization device and a desulfurization method, which effectively utilize the space and the structure of a ship, design a double-layer structure alkali liquid tank, a curved surface runner defogging layer with a hook-shaped liquid collecting tank and a corrosion-resistant double-layer exhaust pipe, and largely use non-metal materials such as glass fiber reinforced plastic, polypropylene, epoxy putty, polyethylene and the like on the ship, thereby not only reducing the cost, but also simplifying the process, enhancing the corrosion resistance performance such as acid resistance, alkali resistance and the like and improving the safety factor.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention discloses a large-scale ship combined type desulfurization device, which has the innovation points that: the system comprises a desulfurizing tower, an alkali liquor cabin, a circulating water cooler, a water treatment unit, a seawater supply pump, a sewage cabin and a zero-discharge cabin;
one path of seawater is led to the circulating water tank through a seawater supply pump, and the other path of seawater is discharged to the outside of a ship board after heat exchange through a circulating water cooler; the alkali liquor cabin supplies alkali liquor to the circulating water cabin, one path of cleaning liquid in the circulating water cabin is subjected to heat exchange by a circulating water cooler and then respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower for desulfurization reaction, and the other path of cleaning liquid is led to the water treatment unit for purification treatment; the cleaning liquid in the desulfurizing tower is led to the circulating water cabin through a liquid outlet of the desulfurizing tower; one path of the cleaning liquid in the water treatment unit is led to the sewage tank, the other path of the cleaning liquid is led to the zero-emission tank, and the purified reusable cleaning liquid returns to the circulating water tank to form a closed desulfurization circulating loop;
seawater respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower through a seawater supply pump to carry out desulfurization reaction, and is discharged to the outside of a ship board through a liquid outlet of the desulfurizing tower to form an open desulfurization circulation loop.
Preferably, the specific structure is as follows: the seawater supply pumps are connected in parallel, the input ends of the seawater supply pumps are respectively communicated with seawater through a sea floor door, the output ends of the seawater supply pumps are respectively communicated with one side input end of the circulating water cooler and a seawater supply end of the circulating water cabin through a cleaning seawater pipe, and one side output end of the circulating water cooler is communicated with a cooling seawater discharging pipe through a cleaning seawater pipe and then communicated to the outside of the ship board; the alkali liquor cabin is communicated with an alkali liquor supply end of the circulating water cabin through an alkali liquor pipe, one path of an output end of the circulating water cabin is communicated with a circulating water pump through a circulating water pipe and is communicated with an input end on the other side face of the circulating water cooler through the circulating water pipe, and after output ends of a plurality of seawater supply pumps are communicated with an output end on the other side face of the circulating water cooler through a cleaning seawater pipe, the output ends are respectively communicated with an input end of a high-temperature spraying area of the desulfurizing tower and an input end of a low-temperature spraying area of the desulfurizing tower through the circulating water pipe; the tail gas of the diesel engine is communicated with the gas inlet of the desulfurizing tower through a waste gas inlet pipe, and the gas outlet of the desulfurizing tower is communicated with the outside through a smoke exhaust outlet pipe; a liquid outlet of the desulfurizing tower is respectively communicated with the input end of the circulating water cabin and one end of a drain pipe through a circulating water pipe, and the other end of the drain pipe is respectively communicated with a plurality of waste water discharging side pipes and then is respectively communicated to the outside of the ship board; and the other path of the output end of the circulating water cabin is communicated with the input end of the water treatment unit through a cleaning liquid purifying pipe, and the output end of the water treatment unit is communicated with the input end of the circulating water cabin through the cleaning liquid purifying pipe.
Preferably, the desulfurization tower comprises a desulfurization tower body, a venturi pretreatment pipeline, a filler washing layer, a demisting layer, a first spraying assembly and a second spraying assembly; the desulfurization tower body is of a vertically arranged hollow U-shaped structure, the opening direction of the desulfurization tower body is arranged upwards, the left half part of the desulfurization tower body is a high-temperature spraying area, the left opening end of the desulfurization tower body is an air inlet, the right half part of the desulfurization tower body is a low-temperature spraying area, and the right opening end of the desulfurization tower body is an air outlet; a first spraying assembly and a venturi pretreatment pipeline are further sequentially arranged in the high-temperature spraying area of the desulfurization tower body from top to bottom, cleaning liquid output by a circulating water cooler is communicated with the input end of the first spraying assembly through a circulating water pipe, the output end of the first spraying assembly is arranged downwards towards the direction of the venturi pretreatment pipeline, and primary desulfurization reaction is carried out on diesel engine tail gas downwards passing through the venturi pretreatment pipeline; a demisting layer, a second spraying assembly and a filler washing layer are sequentially arranged in a low-temperature spraying area of the desulfurizing tower body from top to bottom, a cleaning liquid output by a circulating water cooler is communicated with the input end of the second spraying assembly through a circulating water pipe, the output end of the second spraying assembly is arranged downwards towards the direction of the filler washing layer, and a secondary desulfurization reaction is carried out after the filler washing layer is fully contacted with diesel engine tail gas flowing upwards; the demisting layer is formed by sequentially horizontally and parallelly arranging a plurality of curved surface baffle plates at intervals to form a plurality of vertically arranged curved surface flow channels, and the desulfurized tail gas of the diesel engine is subjected to gas-liquid separation; the inside of desulfurizing tower body leans on venturi preliminary treatment pipeline one side still to be equipped with first temperature switch, first temperature switch locates the high temperature of desulfurizing tower body sprays between district and the low temperature spraying district to monitor the temperature of diesel engine tail gas.
Preferably, the system also comprises an emergency cooling seawater cabin, a spray assembly and a flue gas and sulfur content monitor; a spray assembly is further arranged in the low-temperature spray zone of the desulfurization tower body and is arranged between the demisting layer and the second spray assembly; the emergency cooling seawater cabin is communicated with the input end of the spraying assembly through an emergency cooling water pipe, and the output end of the spraying assembly is arranged downwards towards the direction of the filler washing layer; and a flue gas sulfur content monitor is also arranged at the gas outlet of the desulfurizing tower body.
Preferably, the pipeline sectional area of the venturi pretreatment pipeline is firstly shrunk and then expanded from top to bottom, and the filler washing layer adopts wire mesh filler made of flame-retardant polypropylene.
Preferably, each curved baffle is of a vertically arranged V-shaped structure, and two ends of each curved baffle are arranged up and down; the plurality of curved surface baffle plates are sequentially arranged horizontally and parallelly at intervals and form a plurality of vertically arranged curved surface flow passages; a plurality of hook-shaped liquid collecting grooves are sequentially arranged on two sides of each curved surface baffle plate at intervals, and each hook-shaped liquid collecting groove is integrally formed with the corresponding curved surface baffle plate; the diesel engine tail gas after the secondary desulfurization flows through the curved surface flow channel from bottom to top, collides with the corresponding curved surface baffle plate, generates airflow at the position corresponding to the hook-shaped liquid collecting groove to swirl, and performs gas-liquid separation.
Preferably, the alkali liquor tank is arranged at a position around the bulkhead where a crew can patrol and comprises an inner tank of the alkali liquor tank, an outer tank of the alkali liquor tank, a bottom empty tank, a supporting base, an anti-shaking support, a liquid level switch, a liquid level alarm, a filling pipe, a vent pipe, an outlet pipe, an inlet and outlet pipe for heating the inner tank, an expansion joint and a second temperature switch; the alkali liquor cabin outer cabin is made of carbon steel, an alkali liquor cabin inner cabin is further arranged in the alkali liquor cabin outer cabin, the alkali liquor cabin inner cabin is made of glass steel materials, and a double-layer cabin structure is formed by the alkali liquor cabin inner cabin and the alkali liquor cabin outer cabin; a plurality of supporting bases are uniformly and vertically arranged at the bottom of the alkali liquor cabin at intervals, anti-shaking supports are respectively arranged on the left side and the right side of the alkali liquor cabin, each supporting base is saddle-shaped, and a passing manhole is respectively arranged on each supporting base; a liquid level switch is further arranged at the upper position inside the alkali liquor cabin, and a liquid level alarm is further arranged at the bottom of the alkali liquor cabin outer cabin; filling pipes, vent pipes, outlet pipes and inner chamber heating inlet and outlet pipes are sequentially and vertically arranged between the inner chamber of the alkali liquor chamber and the outer chamber of the alkali liquor chamber at intervals, and the filling pipes, the vent pipes, the outlet pipes and the inner chamber heating inlet and outlet pipes are respectively provided with expansion joints for absorbing deformation; and a heating coil and a second temperature switch are further arranged on the periphery of the alkali liquor cabin inner cabin, and a bottom empty cabin for inspection is further arranged right below the alkali liquor cabin outer cabin.
Preferably, the system also comprises a zero-emission pump; the output end of the water treatment unit is communicated with the input end of the sewage tank through a slag discharge pipe, and the output end of the sewage tank is communicated with the outside through the slag discharge pipe; the output end of the water treatment unit is communicated with the input end of the zero-emission cabin through a drain pipe, the output end of the zero-emission cabin is communicated with one end of the drain pipe through a zero-emission pump, and the output end of the zero-emission cabin is communicated to the outside of the ship board through a plurality of waste water discharge pipes.
Preferably, the cleaning seawater pipe is made of common carbon steel, and a layer of polyethylene is coated inside the cleaning seawater pipe; the circulating water pipe and the drain pipe are both made of glass steel; the circulating water cabin is made of glass fiber reinforced plastic, and the sewage cabin is made of carbon steel and is arranged at the cabin; the cabin capacity of the zero-emission cabin is set according to the sulfur content in tail gas of a ship and a diesel engine, and the cabin capacity of the large ship can be more than 1000m3And is arranged above the waterline of the ship; and a water discharge quality monitor is also arranged on the water discharge pipe, and a circulating water quality monitor is also arranged on the circulating water pipe between the circulating water tank and the circulating water pump.
Preferably, each wastewater discharge side pipe adopts a duplex stainless steel pipeline and comprises an outer carbon steel pipe, an inner duplex stainless steel pipe, a rubber sealing ring and a sealing filler; each two-phase stainless steel inner pipe is sleeved in the corresponding carbon steel outer pipe to form a double-layer pipe structure, and the corresponding carbon steel outer pipe is welded with the hull outer plate; the inner surface of each carbon steel outer pipe is coated with a layer of acid and alkali resistant paint, and rubber sealing rings are sequentially arranged between each duplex stainless steel inner pipe and the corresponding carbon steel outer pipe at intervals; and sealing fillers are also arranged between the adjacent rubber sealing rings, and each sealing filler is sealed by polyester putty or epoxy putty.
The invention discloses a desulfurization method of a large-scale ship combined type desulfurization device, which is characterized by comprising the following steps of:
the method comprises the following steps: firstly, cleaning fluid in a circulating water cabin enters the other side face of a circulating water cooler through a circulating water pump, heat exchange is carried out between the cleaning fluid and seawater in one side face of the circulating water cooler, and the cleaning fluid after temperature reduction enters a first spraying assembly and a second spraying assembly of a desulfurizing tower respectively for spraying; the heated seawater is discharged to the outside of the ship through a cooling seawater discharging pipe;
step two: tail gas of the diesel engine enters the desulfurizing tower body through the waste gas inlet pipe, forms turbulence at the reducing part of the Venturi pretreatment pipeline, and is fully mixed with the mist-shaped liquid drops sprayed by the first spraying assembly to carry out primary desulfurization reaction; cooling the diesel engine tail gas subjected to primary desulfurization to 60 ℃, enabling the diesel engine tail gas to upwards pass through the filler washing layer, and fully mixing with the mist-shaped liquid drops sprayed by the second spraying assembly to perform secondary desulfurization reaction; the diesel engine tail gas after secondary desulfurization is discharged to the outside through a smoke exhaust outlet pipe;
step three: in the ship tail gas desulfurization wastewater discharge limiting area, cleaning solution after secondary desulfurization enters a circulating water tank through a circulating water pipe and then enters a water treatment unit for purification treatment; the treated waste residue enters a sewage tank through a residue discharge pipe; the treated reusable cleaning liquid enters a circulating water cabin, is mixed with alkali solution and seawater input from the alkali liquor cabin, and then enters the other side surface of the circulating water cooler again through a circulating water pump to form a circulating system; the rest of the treated mixed solution enters a zero-emission cabin through a drain pipe for storage;
step four: in a non-ship tail gas desulfurization waste water discharge limiting area, cleaning liquid which cannot be recycled after secondary desulfurization is discharged to the outside of a ship through a waste water discharge pipe, and mixed solution in a zero discharge cabin is discharged to the outside of the ship through a drain pipe and the waste water discharge pipe in sequence;
step five: in a non-ship tail gas sulfur emission limiting area in a global sea area, seawater enters a high-temperature spraying area and a low-temperature spraying area of a desulfurizing tower respectively through a seawater supply pump to carry out desulfurization reaction, and cleaning solution after secondary desulfurization is directly discharged to the outside of a ship through a wastewater exhaust pipe.
The invention has the beneficial effects that:
(1) the invention effectively utilizes the space and the structure of the ship, not only effectively reduces the cost, but also simplifies the desulfurization process and improves the safety factor under the premise of not influencing the loading and the performance;
(2) the invention is provided with the alkali liquor cabin with a double-layer structure, and the alkali liquor cabin is arranged above the waterline of the ship, so that the corrosion resistance is improved, the observation and the maintenance are convenient, the cost is saved, and the safety factor is improved;
(3) the invention effectively isolates toxic and harmful substances, thereby ensuring the health of crews;
(4) the invention effectively utilizes the space of the ship, provides a large-capacity zero-discharge cabin to meet the discharge requirement of the cleaning liquid after the desulfurization is forbidden at the port, thereby reducing the operation cost;
(5) the liquid tank with corrosive media is made of common carbon steel, so that the use of stainless steel and other high-grade materials with high welding requirements is avoided, the material cost and the construction cost are reduced, and the construction process is simplified;
(6) the invention reduces the reinforcing size of the alkali liquor tank;
(7) the invention adopts the low-cost and strong corrosion-resistant polypropylene ethylene filler and is provided with the emergency seawater, so that the corrosion resistance is strong, the material cost is low, and the safety coefficient cannot be reduced;
(8) the invention adopts the double-layer exhaust pipe structure, avoids the welding of stainless steel and carbon steel, simplifies the construction process and ensures the corrosion resistance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic connection diagram of a composite desulfurization device for large ships according to the present invention.
FIG. 2 is a general layout of a composite desulfurizing device for large ships according to the present invention.
Fig. 3 is a plan view of fig. 2.
Fig. 4 is a schematic structural view of a portion of the desulfurization tower of fig. 1.
Fig. 5 is a schematic structural diagram of the defogging layer in fig. 4.
Fig. 6 is a schematic view of the curved flow channel of fig. 5.
Fig. 7 is a schematic structural view of the lye tank in fig. 1.
Fig. 8 is a top view of fig. 7.
Fig. 9 is a side view of fig. 7.
Fig. 10 is a schematic structural view of a portion of the waste water discharging pipe of fig. 1.
Fig. 11 is a partially enlarged view of a portion a in fig. 10.
Wherein, 1-a desulfurizing tower; 2-an alkali liquor cabin; 3-circulating water tank; 4-a sewage tank; 5-zero emission cabin; 6-a water treatment unit; 7-circulating water cooler; 8-subsea gate; 9-seawater supply pump; 10-a circulating water pump; 11-zero-emission pump; 12-emergency cooling seawater cabin; 20-cleaning liquid purifying tube; 21-cleaning the seawater pipe; 22-a circulating water pipe; 23-a drain pipe; 24-a wastewater discharge pipe; 25-a smoke exhaust outlet pipe; 26-an alkali liquor tube; 27-an exhaust gas inlet pipe; 28-a slag discharge pipe; 29-emergency cooling water pipe; 30-cooling the seawater discharge side pipe; 31-a circulating water quality monitor; 32-a drainage water quality monitor; 33-flue gas emission sulfur content monitor; 41-chimney; 42-rudder machine room; 43-a nacelle; 44-rudder machine room fan; 101-venturi pre-treatment pipe; 102-a filler wash layer; 103-demisting layer; 104-a first temperature switch; 105-a first spray assembly; 106-a second spray assembly; 107-a spray assembly; 108-curved baffle plate; 109-diesel exhaust; 110-hook liquid collecting tank; 201-alkali liquor cabin inner chamber; 202-an alkali liquor extra-cabin; 203-bottom empty chamber; 204-a support base; 205-anti-sway bracing; 206-access manhole; 207-liquid level switch; 208-a liquid level alarm; 209-filling pipe; 210-a gas permeable tube; 211-an outlet pipe; 212-heating the inlet and outlet pipes of the inner chamber; 213-an expansion joint; 214-a second temperature switch; 241-hull plates; 242 — inner liner plate; 243-carbon steel outer pipe; 244-duplex stainless steel inner tube; 245-rubber seal ring; 246 — sealing packing.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention discloses a composite desulfurizing device for a large ship, which comprises a desulfurizing tower 1, an alkali liquor cabin 2, a circulating water cabin 3, a circulating water cooler 7, a water treatment unit 6, a seawater supply pump 9, a sewage cabin 4 and a zero-emission cabin 5; as shown in FIGS. 1 to 11, the present invention is a combined desulfurization apparatus comprising a closed desulfurization circulation circuit and an open desulfurization circulation circuit, wherein,
one path of seawater is led to the circulating water tank 3 through a seawater supply pump 9, and the other path of seawater is discharged to the outside of the ship board after heat exchange through a circulating water cooler 7; the alkali liquor cabin 2 supplies alkali liquor to the circulating water cabin 3, one path of cleaning liquid in the circulating water cabin 3 is subjected to heat exchange through a circulating water cooler 7 and then respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower 1 for desulfurization reaction, and the other path of cleaning liquid is led to a water treatment unit 6 for purification treatment; the cleaning liquid in the desulfurizing tower 1 is led to the circulating water tank 3 through a liquid outlet of the desulfurizing tower; one path of the cleaning liquid in the water treatment unit 6 is led to the sewage tank 4, the other path is led to the zero-emission tank 5, and the cleaned reusable cleaning liquid returns to the circulating water tank 3 to form a closed desulfurization circulating loop;
the seawater enters the high-temperature spraying area and the low-temperature spraying area of the desulfurizing tower 1 through the seawater supply pump 9 to perform desulfurization reaction, and is discharged to the outboard through the liquid outlet of the desulfurizing tower 1 to form an open desulfurization circulation loop.
The specific structure is as shown in fig. 1-11, several seawater supply pumps 9 are connected in parallel, and the input ends of the seawater supply pumps are respectively communicated with seawater through a sea chest 8, the output ends of the seawater supply pumps 9 are respectively communicated with one side input end of a circulating water cooler 7 and a seawater supply end of a circulating water tank 3 through a cleaning seawater pipe 21, and one side output end of the circulating water cooler 7 is communicated with a cooling seawater discharging pipe 30 through the cleaning seawater pipe 21 and then communicated to the outboard; thereby carrying out heat exchange and temperature reduction on the cleaning liquid in the other side surface of the circulating water cooler 7.
In the invention, an alkali liquor cabin 2 is communicated with an alkali liquor supply end of a circulating water cabin 3 through an alkali liquor pipe 26, one path of an output end of the circulating water cabin 3 is communicated with a circulating water pump 10 through a circulating water pipe 22 and is communicated with the input end of the other side surface of a circulating water cooler 7 through the circulating water pipe 22, and after the output ends of a plurality of seawater supply pumps 9 are communicated with the output end of the other side surface of the circulating water cooler 7 through a cleaning seawater pipe 21, the output ends are respectively communicated with the input end of a high-temperature spraying area of a desulfurizing tower 1 and the input end of a low-temperature spraying area thereof; wherein, the cleaning seawater pipe 21 is made of common carbon steel, and a layer of polyethylene is coated inside the cleaning seawater pipe; the circulating water pipe 22 is made of glass fiber reinforced plastic materials, so that the risk of pipeline corrosion is reduced, and the cost is reduced; the circulating water tank 3 is made of glass fiber reinforced plastics.
In the invention, the tail gas 109 of the diesel engine is communicated with the gas inlet of the desulfurizing tower 1 through a waste gas inlet pipe 27, and the gas outlet of the desulfurizing tower 1 is communicated with the outside through a smoke outlet pipe 25; a liquid outlet of the desulfurizing tower 1 is respectively communicated with the input end of the circulating water cabin 3 and one end of a drain pipe 23 through a circulating water pipe 22, and the other end of the drain pipe 23 is respectively communicated with a plurality of waste water discharging side pipes 24 and then is respectively communicated to the outboard; the other path of the output end of the circulating water cabin 3 is communicated with the input end of the water treatment unit 6 through a cleaning liquid purifying pipe 20, and the output end of the water treatment unit 6 is communicated with the input end of the circulating water cabin 3 through the cleaning liquid purifying pipe 20; the desulfurization tower 1 comprises a desulfurization tower body, a venturi pretreatment pipeline 101, a filler washing layer 102, a demisting layer 103, a first spraying assembly 105 and a second spraying assembly 106; as shown in fig. 1 and 4, the desulfurization tower body is a vertically arranged hollow U-shaped structure, and the opening direction thereof is arranged upward, the left half part of the desulfurization tower body is a high-temperature spraying area, the left opening end thereof is an air inlet, the right half part of the desulfurization tower body is a low-temperature spraying area, and the right opening end thereof is an air outlet; a first spraying assembly 105 and a venturi pretreatment pipeline 101 are further sequentially arranged in a high-temperature spraying area of the desulfurization tower body from top to bottom, cleaning liquid output by the circulating water cooler 7 is communicated with the input end of the first spraying assembly 105 through a circulating water pipe 22, the output end of the first spraying assembly 105 is downwards arranged towards the direction of the venturi pretreatment pipeline 101, and primary desulfurization reaction is carried out on diesel engine tail gas 109 downwards passing through the venturi pretreatment pipeline 101; the cross section area of the venturi pretreatment pipeline 101 is first contracted and then expanded from top to bottom, and the flow velocity of the diesel engine tail gas 109 at the reducing position of the venturi pretreatment pipeline 101 is improved by changing the caliber of the pipeline, and turbulent flow is formed. According to the invention, the Venturi pretreatment pipeline 101 is arranged, so that most of sulfur content in the tail gas 109 of the diesel engine is absorbed by the cleaning solution; the diesel exhaust 109 is cooled to about 60 ℃ so that the exhaust volume is reduced; at the same time, the dust content in the diesel exhaust 109 is reduced.
As shown in fig. 1 and 4, a demisting layer 103, a second spraying assembly 106 and a filler washing layer 102 are further sequentially arranged in a low-temperature spraying region of the desulfurization tower body from top to bottom, a cleaning liquid output by the circulating water cooler 7 is communicated with an input end of the second spraying assembly 106 through a circulating water pipe 22, an output end of the second spraying assembly 106 is arranged downwards towards the filler washing layer 102, and a secondary desulfurization reaction is performed after the filler washing layer 102 is fully contacted with diesel engine tail gas 109 flowing upwards. Wherein, the filler washing layer 102 adopts a wire mesh filler made of flame retardant polypropylene.
As shown in fig. 1 and 4, the demisting layer 103 is formed by sequentially horizontally and parallelly arranging a plurality of curved baffle plates 108 at intervals to form a plurality of vertically arranged curved flow channels, and the desulfurized diesel engine tail gas 109 is subjected to gas-liquid separation; as shown in fig. 5 and 6, each curved baffle 108 is a V-shaped structure that is vertically arranged, and two ends of the V-shaped structure are arranged up and down; the plurality of curved surface baffle plates 108 are sequentially arranged horizontally and parallelly at intervals and form a plurality of vertically arranged curved surface flow channels; a plurality of hook-shaped liquid collecting grooves 110 are sequentially arranged on two sides of each curved-surface baffle plate 108 at intervals, and each hook-shaped liquid collecting groove 110 is integrally formed with the corresponding curved-surface baffle plate 108; the diesel engine tail gas 109 after the secondary desulfurization flows through the curved surface flow channel from bottom to top, collides with the corresponding curved surface baffle plate 108, and generates airflow convolution at the position corresponding to the hook-shaped liquid collecting groove 110 to intensify the gas convolution, so that the cleaning solution remained in the diesel engine tail gas 109 is fully adsorbed on the curved surface baffle plate 108, is collected, enlarged and then drips to realize gas-liquid separation. The curved surface baffle plate 108 adopts a curved surface streamline shape as a whole, and has a short flow passage and small flow resistance; and the cleaning liquid in the exhaust gas is fully absorbed through the arranged hook-shaped liquid collecting tank 110, so that the sulfur content in the tail gas 109 of the diesel engine is reduced, and the pollution is reduced.
As shown in fig. 1 and 4, a first temperature switch 104 is further disposed inside the desulfurization tower body on the venturi pretreatment pipeline 101 side, and the first temperature switch 104 is disposed between the high-temperature spray zone and the low-temperature spray zone of the desulfurization tower body and monitors the temperature of the diesel exhaust 109; once the temperature of the diesel engine tail gas 109 passing through the venturi pretreatment pipeline 101 exceeds 80 ℃, the first temperature detection switch 104 is triggered to act, and the operation of the desulfurization system is stopped.
As shown in fig. 1 and 4, a spray assembly 107 is further disposed in the low-temperature spray zone of the desulfurization tower body, and the spray assembly 107 is disposed between the demisting layer 103 and the second spray assembly 106; the emergency cooling seawater cabin 12 is communicated with the input end of the spraying assembly 107 through an emergency cooling water pipe 29, and the output end of the spraying assembly 107 is arranged downwards towards the direction of the filler washing layer 102; and a flue gas sulfur content monitor 33 is also arranged at the gas outlet of the desulfurizing tower body. By providing the emergency cooling seawater tank 12, in the case where the seawater supply pump 9 is powered off, stops operating, or the like, the emergency cooling seawater tank 12 inputs emergency cooling seawater to the input end of the spray module 107 through the emergency cooling water pipe 29, and sprays through the spray module 107.
The alkali liquor tank 2 is arranged at a position (such as a rudder machine room 42) around the wall of the tank, where a crew can patrol, and comprises an inner tank 201 of the alkali liquor tank, an outer tank 202 of the alkali liquor tank, a bottom empty tank 203, a supporting base 204, an anti-shaking support 205, a liquid level switch 207, a liquid level alarm 208, a filling pipe 209, a vent pipe 210, an outlet pipe 211, an inlet and outlet pipe 212 for heating the inner tank, an expansion joint 213 and a second temperature switch 214; as shown in fig. 7 to 9, the alkali liquor cabin outer 202 is made of carbon steel, and an alkali liquor cabin inner 201 is further disposed inside the alkali liquor cabin outer 202, wherein the alkali liquor cabin inner 201 is made of glass steel material and forms a double-layer cabin structure with the alkali liquor cabin outer 202; a plurality of supporting bases 204 are uniformly and vertically arranged at the bottom of the alkali liquor cabin inner chamber 201 at intervals, anti-shaking supports 205 are respectively arranged on the left side and the right side of the alkali liquor cabin inner chamber, each supporting base 204 is saddle-shaped, and a passing manhole 206 is respectively arranged on each supporting base; a liquid level switch 207 is arranged at the upper position inside the alkali liquor cabin 201, once the liquid level reaches the designated height, an inlet valve is closed, and the pressure of the alkali liquor cabin 201 is ensured not to exceed the standard; a liquid level alarm 208 is also arranged at the bottom of the alkali liquor cabin outer cabin 202, and once the alkali liquor cabin inner cabin 201 is damaged, the liquid level alarm gives an alarm; the inner wall of the lye tank outer tank 202 is coated with alkali-resistant paint;
as shown in fig. 7-9, a filling pipe 209, a vent pipe 210, an outlet pipe 211 and an inner tank heating inlet and outlet pipe 212 are further vertically arranged between the inner tank 201 and the outer tank 202 of the alkali tank at intervals in sequence, and the filling pipe 209, the vent pipe 210, the outlet pipe 211 and the inner tank heating inlet and outlet pipe 212 are further respectively provided with an expansion joint 213 for absorbing deformation caused by ship shaking, thermal expansion, cold contraction and the like; a heating coil and a second temperature switch 214 are further arranged on the periphery of the alkali liquor cabin inner chamber 201, and when the temperature is lower than the alkali liquor storage requirement, the alkali liquor cabin inner chamber 201 is heated, so that the alkali liquor is prevented from crystallizing and the quality is prevented from being influenced; when the temperature is higher than the set value, the heating of the alkali liquor cabin 201 is stopped; a bottom empty chamber 203 for inspection is also arranged under the alkali liquor cabin outer chamber 202, and the surrounding steel plate enclosure walls of the alkali liquor cabin 2 can be inspected by sailors to find the corrosion of the steel plate in time, so that measures such as repair and the like are taken. Wherein, the inside of the alkali liquor cabin 201 is not provided with a support to prevent the cleaning solution from settling in the inside. The lye tank 2 can be arranged in exposed areas of the ship, such as exposed areas beside a chimney 41 and a rudder machine room 42; the rudder machine room fan 44 can be arranged in a closed room, so that the air is exhausted outside the room in case of emergency such as alkali liquor leakage, and the influence on the health of crew due to retention of corrosive gas is avoided.
In the invention, the output end of the water treatment unit 6 is communicated with the input end of the sewage tank 4 through the slag discharge pipe 28, and the output end of the sewage tank 4 is communicated with the outside through the slag discharge pipe 28; as shown in fig. 1, the output end of the water treatment unit 6 is communicated with the input end of the zero-discharge tank 5 through a drain pipe 23, and the output end of the zero-discharge tank 5 is communicated with one end of the drain pipe 23 through a zero-discharge pump 11 and then communicated outboard through a plurality of waste water discharge pipes 24. Wherein, the sewage tank 4 is made of carbon steel and is arranged at the cabin 43, and crews all around the cabin wall can patrol and be easily maintained; the cabin capacity of the zero-emission cabin 5 can be flexibly set according to the course of the large ship and the sulfur content in the tail gas of the diesel engine, and the cabin capacity of the large ship can be more than 1000m3And is arranged above the ship waterline so that sailors can check the corrosion condition of the steel plate.
As shown in fig. 1, a drain pipe 23 is further provided with a drain water quality monitor 32, and a circulating water quality monitor 31 is further provided on the circulating water pipe 22 between the circulating water tank 3 and the circulating water pump 10; wherein, drain pipe 23 adopts the glass steel material to make, has reduced the risk of pipeline corruption on the one hand, and on the other hand the cost is reduced.
Each waste water discharge side pipe 24 adopts a duplex stainless steel pipeline and comprises an outer carbon steel pipe 243, an inner duplex stainless steel pipe 244, a rubber sealing ring 245 and a sealing filler 246; as shown in fig. 10 and 11, each duplex stainless steel inner pipe 244 is sleeved inside a corresponding carbon steel outer pipe 243 to form a double-layer pipe structure, and the corresponding carbon steel outer pipe 243 is welded with the hull outer plate 241; a layer of acid and alkali resistant paint is coated on the inner surface of each outer carbon steel pipe 243, and rubber sealing rings 245 are sequentially arranged between each inner duplex stainless steel pipe 244 and the corresponding outer carbon steel pipe 243 at intervals; seal packings 246 are further provided between adjacent rubber seal rings 245, and each seal packing 246 is sealed with a polyester putty or epoxy putty seal packing 246 to prevent crevice corrosion. The wastewater discharge pipes 24 adopt duplex stainless steel pipelines, and the welding between the carbon steel outer pipe and the hull plate 241 still maintains the welding between the carbon steel and the carbon steel, so that the technical quality is ensured.
The invention discloses a desulfurization method of a large-scale ship combined type desulfurization device, which comprises the following steps of:
the method comprises the following steps: firstly, cleaning fluid in a circulating water chamber 3 enters the other side face of a circulating water cooler 7 through a circulating water pump 10, heat exchange is carried out between the cleaning fluid and seawater in one side face of the circulating water cooler 7, and the cleaning fluid after temperature reduction is mixed with the seawater and then respectively enters a first spraying assembly 105 and a second spraying assembly 106 of a desulfurizing tower 1 for spraying; the heated seawater is discharged to the outside through the seawater cooling discharge side pipe 30;
step two: the diesel engine tail gas 109 enters the desulfurizing tower body through the waste gas inlet pipe 27, forms turbulence at the reducing part of the Venturi pretreatment pipeline 101, and is fully mixed with the mist-shaped liquid drops sprayed by the first spraying assembly 105 to carry out primary desulfurization reaction; the diesel engine tail gas 109 after primary desulfurization is cooled to about 60 ℃, then passes through the filler washing layer 102 upwards, and is fully mixed with the mist-shaped liquid drops sprayed by the second spraying component 106 to carry out secondary desulfurization reaction; the diesel engine tail gas 109 after the secondary desulfurization is discharged to the outside through the exhaust outlet pipe 25;
step three: in the ship tail gas desulfurization wastewater discharge limiting area (ship tail gas sulfur discharge limiting area), cleaning solution after secondary desulfurization enters the circulating water tank 3 through the circulating water pipe 22 and then enters the water treatment unit 6 for purification treatment; the processed waste residue enters the sewage tank 4 through a residue discharge pipe 28; the treated reusable cleaning solution enters the circulating water cabin 3, is mixed with the alkali solution and the seawater input from the alkali solution cabin 2, and then enters the other side surface of the circulating water cooler 7 again through the circulating water pump 10 to form a circulating system; the rest of the treated mixed solution enters the zero-emission cabin 5 through a drain pipe 23 for storage;
step four: in a non-ship tail gas desulfurization waste water discharge limiting area (ship tail gas sulfur discharge limiting area), cleaning liquid which cannot be recycled after secondary desulfurization is discharged to the outside of a ship through a waste water discharge pipe 24, and mixed solution in the zero discharge cabin 5 is discharged to the outside of the ship through a drain pipe 23 and the waste water discharge pipe 24 in sequence;
step five: in a non-marine tail gas sulfur emission limiting area in a global sea area, seawater enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower 1 through a seawater supply pump 9 to perform a desulfurization reaction, and cleaning solution after secondary desulfurization is directly discharged to the outside through a wastewater exhaust pipe 24.
The invention has the beneficial effects that:
(1) the invention effectively utilizes the space and the structure of the ship, not only effectively reduces the cost, but also simplifies the desulfurization process and improves the safety factor under the premise of not influencing the loading and the performance;
(2) the invention is provided with the alkali liquor tank with a double-layer structure, and the alkali liquor tank 2 is arranged above the waterline of the ship, so that the corrosion resistance is improved, the observation and the maintenance are convenient, the cost is saved, and the safety factor is improved;
(3) the invention effectively isolates toxic and harmful substances, thereby ensuring the health of crews;
(4) the invention effectively utilizes the space of the ship, provides the large-capacity zero-discharge cabin 5 to meet the discharge requirement of the cleaning liquid after the desulfurization is forbidden at the port, thereby reducing the operation cost;
(5) the liquid tank with corrosive media is made of common carbon steel, so that the use of stainless steel and other high-grade materials with high welding requirements is avoided, the material cost and the construction cost are reduced, and the construction process is simplified;
(6) the invention reduces the reinforcing size of the alkali liquor cabin 2;
(7) the invention adopts the low-cost and strong corrosion-resistant polypropylene ethylene filler and is provided with the emergency seawater, so that the corrosion resistance is strong, the material cost is low, and the safety coefficient cannot be reduced;
(8) the invention adopts the double-layer exhaust pipe structure, avoids the welding of stainless steel and carbon steel, simplifies the construction process and ensures the corrosion resistance.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (11)
1. A large-scale boats and ships combined type desulphurization unit which characterized in that: the system comprises a desulfurizing tower, an alkali liquor cabin, a circulating water cooler, a water treatment unit, a seawater supply pump, a sewage cabin and a zero-discharge cabin;
one path of seawater is led to the circulating water tank through a seawater supply pump, and the other path of seawater is discharged to the outside of a ship board after heat exchange through a circulating water cooler; the alkali liquor cabin supplies alkali liquor to the circulating water cabin, one path of cleaning liquid in the circulating water cabin is subjected to heat exchange by a circulating water cooler and then respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower for desulfurization reaction, and the other path of cleaning liquid is led to the water treatment unit for purification treatment; the cleaning liquid in the desulfurizing tower is led to the circulating water cabin through a liquid outlet of the desulfurizing tower; one path of the cleaning liquid in the water treatment unit is led to the sewage tank, the other path of the cleaning liquid is led to the zero-emission tank, and the purified reusable cleaning liquid returns to the circulating water tank to form a closed desulfurization circulating loop;
seawater respectively enters a high-temperature spraying area and a low-temperature spraying area of the desulfurizing tower through a seawater supply pump to carry out desulfurization reaction, and is discharged to the outside of a ship board through a liquid outlet of the desulfurizing tower to form an open desulfurization circulation loop.
2. The large vessel composite desulfurization apparatus according to claim 1, wherein: the concrete structure is as follows: the seawater supply pumps are connected in parallel, the input ends of the seawater supply pumps are respectively communicated with seawater through a sea floor door, the output ends of the seawater supply pumps are respectively communicated with one side input end of the circulating water cooler and a seawater supply end of the circulating water cabin through a cleaning seawater pipe, and one side output end of the circulating water cooler is communicated with a cooling seawater discharging pipe through a cleaning seawater pipe and then communicated to the outside of the ship board; the alkali liquor cabin is communicated with an alkali liquor supply end of the circulating water cabin through an alkali liquor pipe, one path of an output end of the circulating water cabin is communicated with a circulating water pump through a circulating water pipe and is communicated with an input end on the other side face of the circulating water cooler through the circulating water pipe, and after output ends of a plurality of seawater supply pumps are communicated with an output end on the other side face of the circulating water cooler through a cleaning seawater pipe, the output ends are respectively communicated with an input end of a high-temperature spraying area of the desulfurizing tower and an input end of a low-temperature spraying area of the desulfurizing tower through the circulating water pipe; the tail gas of the diesel engine is communicated with the gas inlet of the desulfurizing tower through a waste gas inlet pipe, and the gas outlet of the desulfurizing tower is communicated with the outside through a smoke exhaust outlet pipe; a liquid outlet of the desulfurizing tower is respectively communicated with the input end of the circulating water cabin and one end of a drain pipe through a circulating water pipe, and the other end of the drain pipe is respectively communicated with a plurality of waste water discharging side pipes and then is respectively communicated to the outside of the ship board; and the other path of the output end of the circulating water cabin is communicated with the input end of the water treatment unit through a cleaning liquid purifying pipe, and the output end of the water treatment unit is communicated with the input end of the circulating water cabin through the cleaning liquid purifying pipe.
3. The large vessel composite desulfurization apparatus according to claim 2, wherein: the desulfurization tower comprises a desulfurization tower body, a Venturi pretreatment pipeline, a filler washing layer, a demisting layer, a first spraying assembly and a second spraying assembly; the desulfurization tower body is of a vertically arranged hollow U-shaped structure, the opening direction of the desulfurization tower body is arranged upwards, the left half part of the desulfurization tower body is a high-temperature spraying area, the left opening end of the desulfurization tower body is an air inlet, the right half part of the desulfurization tower body is a low-temperature spraying area, and the right opening end of the desulfurization tower body is an air outlet; a first spraying assembly and a venturi pretreatment pipeline are further sequentially arranged in the high-temperature spraying area of the desulfurization tower body from top to bottom, cleaning liquid output by a circulating water cooler is communicated with the input end of the first spraying assembly through a circulating water pipe, the output end of the first spraying assembly is arranged downwards towards the direction of the venturi pretreatment pipeline, and primary desulfurization reaction is carried out on diesel engine tail gas downwards passing through the venturi pretreatment pipeline; a demisting layer, a second spraying assembly and a filler washing layer are sequentially arranged in a low-temperature spraying area of the desulfurizing tower body from top to bottom, a cleaning liquid output by a circulating water cooler is communicated with the input end of the second spraying assembly through a circulating water pipe, the output end of the second spraying assembly is arranged downwards towards the direction of the filler washing layer, and a secondary desulfurization reaction is carried out after the filler washing layer is fully contacted with diesel engine tail gas flowing upwards; the demisting layer is formed by sequentially horizontally and parallelly arranging a plurality of curved surface baffle plates at intervals to form a plurality of vertically arranged curved surface flow channels, and the desulfurized tail gas of the diesel engine is subjected to gas-liquid separation; the inside of desulfurizing tower body leans on venturi preliminary treatment pipeline one side still to be equipped with first temperature switch, first temperature switch locates the high temperature of desulfurizing tower body sprays between district and the low temperature spraying district to monitor the temperature of diesel engine tail gas.
4. The large vessel composite desulfurization device according to claim 3, wherein: the emergency cooling seawater cabin is also arranged on the device, and the spraying component and the flue gas sulfur content monitor are arranged on the device; a spray assembly is further arranged in the low-temperature spray zone of the desulfurization tower body and is arranged between the demisting layer and the second spray assembly; the emergency cooling seawater cabin is communicated with the input end of the spraying assembly through an emergency cooling water pipe, and the output end of the spraying assembly is arranged downwards towards the direction of the filler washing layer; and a flue gas sulfur content monitor is also arranged at the gas outlet of the desulfurizing tower body.
5. The large vessel composite desulfurization device according to claim 3, wherein: the pipeline sectional area of the Venturi pretreatment pipeline is firstly contracted and then expanded from top to bottom, and the filler washing layer is made of a wire mesh filler made of flame-retardant polypropylene.
6. The large vessel composite desulfurization device according to claim 3, wherein: each curved baffle plate is of a vertically arranged V-shaped structure, and two ends of each curved baffle plate are arranged up and down; the plurality of curved surface baffle plates are sequentially arranged horizontally and parallelly at intervals and form a plurality of vertically arranged curved surface flow passages; a plurality of hook-shaped liquid collecting grooves are sequentially arranged on two sides of each curved surface baffle plate at intervals, and each hook-shaped liquid collecting groove is integrally formed with the corresponding curved surface baffle plate; the diesel engine tail gas after the secondary desulfurization flows through the curved surface flow channel from bottom to top, collides with the corresponding curved surface baffle plate, generates airflow at the position corresponding to the hook-shaped liquid collecting groove to swirl, and performs gas-liquid separation.
7. The large vessel composite desulfurization apparatus according to claim 2, wherein: the alkali liquor tank is arranged at a position around the tank wall where a crew can patrol and comprises an inner tank of the alkali liquor tank, an outer tank of the alkali liquor tank, a bottom empty tank, a supporting base, an anti-shaking support, a liquid level switch, a liquid level alarm, a filling pipe, a vent pipe, an outlet pipe, an inner tank heating inlet and outlet pipe, an expansion joint and a second temperature switch; the alkali liquor cabin outer cabin is made of carbon steel, an alkali liquor cabin inner cabin is further arranged in the alkali liquor cabin outer cabin, the alkali liquor cabin inner cabin is made of glass steel materials, and a double-layer cabin structure is formed by the alkali liquor cabin inner cabin and the alkali liquor cabin outer cabin; a plurality of supporting bases are uniformly and vertically arranged at the bottom of the alkali liquor cabin at intervals, anti-shaking supports are respectively arranged on the left side and the right side of the alkali liquor cabin, each supporting base is saddle-shaped, and a passing manhole is respectively arranged on each supporting base; a liquid level switch is further arranged at the upper position inside the alkali liquor cabin, and a liquid level alarm is further arranged at the bottom of the alkali liquor cabin outer cabin; filling pipes, vent pipes, outlet pipes and inner chamber heating inlet and outlet pipes are sequentially and vertically arranged between the inner chamber of the alkali liquor chamber and the outer chamber of the alkali liquor chamber at intervals, and the filling pipes, the vent pipes, the outlet pipes and the inner chamber heating inlet and outlet pipes are respectively provided with expansion joints for absorbing deformation; and a heating coil and a second temperature switch are further arranged on the periphery of the alkali liquor cabin inner cabin, and a bottom empty cabin for inspection is further arranged right below the alkali liquor cabin outer cabin.
8. The large vessel composite desulfurization device according to claim 3, wherein: the system also comprises a zero-emission pump; the output end of the water treatment unit is communicated with the input end of the sewage tank through a slag discharge pipe, and the output end of the sewage tank is communicated with the outside through the slag discharge pipe; the output end of the water treatment unit is communicated with the input end of the zero-emission cabin through a drain pipe, the output end of the zero-emission cabin is communicated with one end of the drain pipe through a zero-emission pump, and the output end of the zero-emission cabin is communicated to the outside of the ship board through a plurality of waste water discharge pipes.
9. The large vessel composite desulfurization apparatus according to claim 8, wherein: the cleaning seawater pipe is made of common carbon steel, and a layer of polyethylene is coated inside the cleaning seawater pipe; the circulating water pipe and the drain pipe are both made of glass steel; the circulating water cabin is made of glass fiber reinforced plastic, and the sewage cabin is made of carbon steel and is arranged at the cabin; the cabin capacity of the zero-emission cabin is set according to the sulfur content in tail gas of a ship and a diesel engine, and the cabin capacity of the large ship can be more than 1000m3And is arranged above the waterline of the ship; a water discharge quality monitor is arranged on the water discharge pipe, and the circulating water tank and the water discharge pipe are connected with each otherAnd a circulating water quality monitor is also arranged on the circulating water pipe between the circulating water pumps.
10. The large vessel composite desulfurization apparatus according to claim 2, wherein: each wastewater discharge side pipe adopts a duplex stainless steel pipeline and comprises an outer carbon steel pipe, an inner duplex stainless steel pipe, a rubber sealing ring and sealing filler; each two-phase stainless steel inner pipe is sleeved in the corresponding carbon steel outer pipe to form a double-layer pipe structure, and the corresponding carbon steel outer pipe is welded with the hull outer plate; the inner surface of each carbon steel outer pipe is coated with a layer of acid and alkali resistant paint, and rubber sealing rings are sequentially arranged between each duplex stainless steel inner pipe and the corresponding carbon steel outer pipe at intervals; and sealing fillers are also arranged between the adjacent rubber sealing rings, and each sealing filler is sealed by polyester putty or epoxy putty.
11. The desulfurization method of the large vessel combined type desulfurization apparatus according to any one of claims 1 to 10, characterized by comprising the steps of:
the method comprises the following steps: firstly, cleaning fluid in a circulating water cabin enters the other side face of a circulating water cooler through a circulating water pump, heat exchange is carried out between the cleaning fluid and seawater in one side face of the circulating water cooler, and the cleaning fluid after temperature reduction enters a first spraying assembly and a second spraying assembly of a desulfurizing tower respectively for spraying; the heated seawater is discharged to the outside of the ship through a cooling seawater discharging pipe;
step two: tail gas of the diesel engine enters the desulfurizing tower body through the waste gas inlet pipe, forms turbulence at the reducing part of the Venturi pretreatment pipeline, and is fully mixed with the mist-shaped liquid drops sprayed by the first spraying assembly to carry out primary desulfurization reaction; cooling the diesel engine tail gas subjected to primary desulfurization to 60 ℃, enabling the diesel engine tail gas to upwards pass through the filler washing layer, and fully mixing with the mist-shaped liquid drops sprayed by the second spraying assembly to perform secondary desulfurization reaction; the diesel engine tail gas after secondary desulfurization is discharged to the outside through a smoke exhaust outlet pipe;
step three: in the ship tail gas desulfurization wastewater discharge limiting area, cleaning solution after secondary desulfurization enters a circulating water tank through a circulating water pipe and then enters a water treatment unit for purification treatment; the treated waste residue enters a sewage tank through a residue discharge pipe; the treated reusable cleaning liquid enters a circulating water cabin, is mixed with alkali solution and seawater input from the alkali liquor cabin, and then enters the other side surface of the circulating water cooler again through a circulating water pump to form a circulating system; the rest of the treated mixed solution enters a zero-emission cabin through a drain pipe for storage;
step four: in a non-ship tail gas desulfurization waste water discharge limiting area, cleaning liquid which cannot be recycled after secondary desulfurization is discharged to the outside of a ship through a waste water discharge pipe, and mixed solution in a zero discharge cabin is discharged to the outside of the ship through a drain pipe and the waste water discharge pipe in sequence;
step five: in a non-ship tail gas sulfur emission limiting area in a global sea area, seawater enters a high-temperature spraying area and a low-temperature spraying area of a desulfurizing tower respectively through a seawater supply pump to carry out desulfurization reaction, and cleaning solution after secondary desulfurization is directly discharged to the outside of a ship through a wastewater exhaust pipe.
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| CN114011227A (en) * | 2021-11-09 | 2022-02-08 | 浙江浙能迈领环境科技有限公司 | Efficient anti-blocking ship mixed desulfurization method, system and application |
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Application publication date: 20210205 |