CN110681242A - Ship seawater desulfurization system and method - Google Patents
Ship seawater desulfurization system and method Download PDFInfo
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- CN110681242A CN110681242A CN201911012512.9A CN201911012512A CN110681242A CN 110681242 A CN110681242 A CN 110681242A CN 201911012512 A CN201911012512 A CN 201911012512A CN 110681242 A CN110681242 A CN 110681242A
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- 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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/14—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 by absorption
- B01D53/1412—Controlling the absorption process
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- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
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- B01D2252/10—Inorganic absorbents
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- B01D2252/1035—Sea water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/30—Sulfur compounds
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention provides a ship seawater desulfurization system, comprising: a plurality of marine generators; a seawater supply system; tail gas generated by a ship generator and seawater extracted by a seawater supply system enter the flue gas washing tower to generate a desulfurization reaction and generate waste liquid and waste gas; the detection system is used for acquiring state information of the tail gas, the waste gas and the waste liquid; and the seawater supply control system is in signal connection with the ship power system, the seawater supply system and the detection system, and controls the flow of seawater extracted by the seawater supply system according to the state information of the tail gas, the waste gas and the waste liquid sent by the detection system and the power of the ship generator in work. The invention also provides a ship seawater desulfurization method. The invention can ensure that the waste liquid and the waste gas discharged by the ship reach the discharge standard, and control the power of the seawater supply system by accurately calculating the seawater amount required during tail gas desulfurization, thereby saving a large amount of energy.
Description
Technical Field
The invention relates to the technical field of ship waste gas pollution prevention and control, in particular to a system and a method for removing sulfur oxides in ship waste gas by using seawater.
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, since the exhaust gas from ships contains a large amount of sulfur oxides SO2 and nitrogen oxides NO2, 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. With the stricter and stricter national emission regulation limit, the control of 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. The fuel oil with low sulfur content needs to be modified in the whole engine fuel oil system besides the cost of the fuel oil, because the parameters such as physicochemical properties, flash point, viscosity, specific gravity, calorific value and the like of the high-sulfur heavy oil are not available, so that 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. At present, most of domestic ship engine waste gas desulfurization and emission reduction equipment is in a development and test stage.
The seawater desulfurization process is a desulfurization method for removing sulfur dioxide in flue gas by using the alkalinity of seawater. In the traditional process, a large amount of seawater is sprayed and washed in a desulfurization absorption tower to enter coal-fired flue gas in the absorption tower, sulfur dioxide in the flue gas is absorbed by the seawater to be removed, the purified flue gas is demisted by a demister and is heated by a flue gas heat exchanger to be discharged, and wastewater generated by desulfurization can be directly discharged into the sea. In the prior art, attention is paid to whether more waste water reaches the discharge standard, and the seawater required for actually carrying out the desulfurization reaction is not accurately controlled, so that the energy consumption waste of a seawater pump is inevitably caused.
Disclosure of Invention
The invention aims to provide a ship seawater desulfurization system and a ship seawater desulfurization method, which not only ensure that waste gas and waste liquid discharged from a flue gas washing tower reach the discharge standard, but also can monitor the content of sulfide in the discharged waste gas and waste liquid in real time, adjust the power of a seawater pump in real time according to the monitoring result and greatly save energy when seawater is introduced into the flue gas washing tower to desulfurize tail gas generated by a ship generator.
In order to achieve the above object, the present invention provides a seawater desulfurization system for a ship, comprising:
the ship power system comprises a plurality of ship generators and is used for providing power for ships and shipborne equipment;
a seawater supply system for extracting seawater;
tail gas generated by a ship generator enters a flue gas inlet at the lower end of the flue gas washing tower through a corresponding gas inlet pipeline; seawater pumped by the seawater supply system enters a seawater inlet at the upper end of the flue gas washing tower; the tail gas and the seawater are subjected to desulfurization reaction in the flue gas washing tower to generate waste liquid and waste gas; the waste gas is discharged to the atmosphere from a clean smoke discharge port at the upper end of the smoke washing tower through a waste gas discharge pipeline; the waste liquid is discharged to the sea from a waste liquid discharge port at the lower end of the flue gas washing tower through a waste liquid discharge pipeline;
the detection system is connected with the air inlet pipeline, the waste gas discharge pipeline and the waste liquid discharge pipeline and is used for acquiring and sending state information of the tail gas, the waste gas and the waste liquid;
the seawater supply control system is in signal connection with the ship power system, the seawater supply system and the detection system; and controlling the flow of the seawater extracted by the seawater supply system according to the state information of the tail gas, the waste gas and the waste liquid sent by the detection system and the power of the ship generator in work.
The detection system comprises a seawater detection device, an air inlet detection device and an exhaust detection device; the seawater detection device is connected with the waste liquid discharge pipeline and is used for collecting the flow value, the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid; the exhaust detection device is connected with the exhaust emission pipeline and is used for collecting the flow value, the temperature value, the air pressure value and the sulfur content of the exhaust gas; the air inlet detection device is connected with the air inlet pipeline and is used for collecting the air pressure value, the temperature value and the sulfur content of the tail gas.
The seawater supply system includes: a plurality of seawater pumps and a plurality of frequency converters; the frequency converters are connected between the seawater pump and the seawater supply control system in a signal mode, and one frequency converter corresponds to one seawater pump; the seawater supply control system generates a corresponding power increase instruction or power decrease instruction according to the sulfur content of the waste gas and the sulfur content of the waste liquid and sends the power increase instruction or power decrease instruction to the frequency converter; and the frequency converter drives the corresponding sea water pump to increase or decrease the output power according to the power increasing instruction or the power decreasing instruction.
The air inlet pipeline is provided with a three-way valve which is in signal connection with the seawater supply control system and is controlled to open or close by the seawater supply control system; and tail gas generated by the ship generator enters the flue gas washing tower through a three-way valve of the corresponding air inlet pipeline.
The marine seawater desulfurization system also comprises an alarm system which is in signal connection with the seawater supply control system; when any one of the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid exceeds the corresponding alarm threshold value, or any one of the temperature value, the air pressure value and the sulfur content of the waste gas exceeds the corresponding alarm threshold value, or any one of the air pressure value and the temperature value of the tail gas exceeds the corresponding alarm threshold value, the seawater supply control system generates an alarm signal and a work stopping instruction; the alarm system carries out sound-light alarm according to the received alarm signal; the three-way valve in the valve opening state is closed according to the stop working instruction; and the frequency converter drives the seawater pump to stop working according to the stop working instruction.
The marine seawater desulfurization system also comprises a display system which is in signal connection with the seawater supply control system; the device is used for displaying the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, displaying the temperature value, the air pressure value and the sulfur content of the waste gas and displaying the air pressure value and the temperature value of the tail gas.
The ship seawater desulfurization system further comprises a data storage system, wherein the data storage system is in signal connection with the seawater supply control system and is used for storing the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, the temperature value, the air pressure value and the sulfur content of the waste gas and the air pressure value and the temperature value of the tail gas.
The invention discloses a ship seawater desulfurization method, which is realized by adopting a ship seawater desulfurization system and comprises the following steps:
s1, the seawater supply control system acquires the working state of the ship generator, generates a valve opening command for a three-way valve corresponding to the ship generator in work, and drives the three-way valve to open through the valve opening command; tail gas of the ship generator enters the flue gas washing tower through the corresponding air inlet pipeline during operation;
s2, the seawater supply control system sends a starting instruction to the frequency converter, the frequency converter drives the corresponding seawater pump to work according to the rated power according to the starting instruction, and the seawater pump pumps seawater to the flue gas washing tower; carrying out desulfurization reaction on the seawater and the tail gas in a flue gas washing tower;
s3, collecting the flow value, temperature value, PH value, PHA value and sulfur content of the waste liquid in the waste liquid discharge pipeline by the seawater detection device; the exhaust detection device collects the flow value, temperature value, air pressure value and sulfur content of the exhaust gas in the exhaust gas discharge pipeline; the air inlet detection device acquires the air pressure value, the temperature value and the sulfur content of tail gas in an air inlet pipeline;
s4, when the sulfur content in the waste gas and the sulfur content in the waste liquid exceed a set first threshold value, the seawater supply control system generates a power increase instruction and sends the power increase instruction to the frequency converter; the frequency converter increases the output power of the seawater pump according to the power increase instruction; when the sulfur content of the waste gas and the sulfur content of the waste liquid are lower than a set second threshold value, the seawater supply control system generates a power reduction instruction and sends the power reduction instruction to the frequency converter; the frequency converter reduces the output power of the corresponding sea water pump according to the power reduction instruction; the second threshold is less than the first threshold.
The step S3 further includes: the data storage system stores the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, stores the temperature value, the air pressure value and the sulfur content of the waste gas and stores the air pressure value and the temperature value of the tail gas.
The ship seawater desulfurization method further comprises the following steps:
s5, when any one of the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid exceeds the corresponding alarm threshold value, or any one of the temperature value, the air pressure value and the sulfur content of the waste gas exceeds the corresponding alarm threshold value, or any one of the air pressure value and the temperature value of the tail gas exceeds the corresponding alarm threshold value, the seawater supply control system generates an alarm signal and a stop working instruction; the alarm system carries out sound-light alarm according to the received alarm signal; the three-way valve in the valve opening state is closed according to the stop working instruction; and the frequency converter drives the corresponding seawater pump to stop working according to the stop working instruction.
Compared with the prior art, the invention can ensure that sulfides in the waste gas and the waste liquid discharged by the ship reach the discharge standard, can accurately control the power of the seawater pump, realizes the accurate control of the seawater desulfurization of the ship, greatly saves the working energy of the seawater pump, and is beneficial to increasing the cruising ability of the ship.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are an embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts according to the drawings:
FIG. 1 is a schematic diagram of a marine seawater desulfurization system according to the present invention;
FIG. 2 is a flow chart of a method for desulfurizing seawater of a ship according to the present invention;
in the figure: 1. a seawater supply system; 11. a sea water pump; 12. a frequency converter;
2. a marine power system; 21. a marine generator; 22. a three-way valve;
31. an exhaust gas detection device; 311. an exhaust gas discharge line; 32. an intake air detection device; 321. an air intake line; 33. a seawater detection device; 331. a waste liquid discharge pipeline;
4. a seawater supply control system; 5. an alarm system; 6. a display system; 7. a data storage system; 8. flue gas scrubbing tower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides a seawater desulfurization system for a ship, as shown in fig. 1, comprising: the system comprises a ship power system 2, a seawater supply system 1, a flue gas washing tower 8, a detection system, a seawater supply control system 4, an alarm system 5, a display system 6 and a data storage system 7.
The marine power system 2 includes a plurality of marine generators 21 for powering a ship and onboard equipment. The marine generator 21 may be divided into a main engine for providing navigation power to the marine vessel and an auxiliary engine for providing working energy to devices on the vessel, such as lights, pumps, boilers, etc. When the power consumption of the ship is low, the auxiliary machine may not be fully put into use.
The seawater supply system 1 is for extracting seawater, and includes: a plurality of sea water pumps 11 and a plurality of frequency converters 12, and a frequency converter 12 is connected with a corresponding sea water pump 11 by signals. The specifications of the seawater pump 11 and the frequency converter 12 may be determined according to the total power of all the marine generators 21. The larger the total power of all the marine generators 21 is, the larger the rated power of the seawater pump 11 and the frequency converter 12 is.
The tail gas generated by the ship generator 21 enters the flue gas through the corresponding air inlet pipeline 321A flue gas inlet at the lower end of the scrubber tower 8. One ship generator 21 corresponds to one intake pipe 321. The air inlet pipeline 321 is provided with a three-way valve 22, and the tail gas generated by the marine generator 21 enters the flue gas washing tower 8 through the three-way valve 22 corresponding to the air inlet pipeline 321. In the present invention, when the three-way valve 22 is in the open state, the exhaust gas of the marine generator 21 can enter the flue gas washing tower 8 through the three-way valve 22 corresponding to the air intake pipe 321. When the three-way valve 22 is in a valve closing state, the exhaust gas of the marine generator 21 is directly discharged to the atmosphere and cannot enter the flue gas washing tower 8. The pumped seawater enters a seawater inlet at the upper end of the flue gas scrubber 8. The tail gas and seawater undergo a desulfurization reaction in the flue gas scrubber 8 and produce a waste liquid and a waste gas. The exhaust gas is discharged to the atmosphere through an exhaust gas discharge pipe 311 from a clean flue gas discharge port at the upper end of the flue gas scrubbing tower. The waste liquid is discharged from a waste liquid discharge port at the lower end of the flue gas washing tower to the sea through a waste liquid discharge pipeline 331. The principle of the desulfurization reaction is to utilize the natural acid-base buffer capacity of seawater and absorb SO2Ability of SO in the exhaust gas2The following main reactions occur after contact with seawater:
SO2the sulfate is generated after the seawater is contacted, the sulfate content in the natural seawater is generally 2700mg/L, the sulfate content increased by desulfurization is about 70-80mg/L, and the normal fluctuation range of the natural seawater is realized, so the seawater desulfurization does not destroy the natural components of the seawater, and does not generate byproducts to be treated.
And the detection system is connected with the air inlet pipeline 321, the waste gas discharge pipeline 311 and the waste liquid discharge pipeline 331 and is used for acquiring and sending the state information of the tail gas, the waste gas and the waste liquid. The detection system comprises a seawater detection device 33, an air inlet detection device 32 and an exhaust detection device 31. The seawater detection device 33 is connected to the waste liquid discharge pipeline 331, and is configured to collect state information of the waste liquid, where the state information of the waste liquid specifically includes a flow value, a temperature value, a PH value, a PHA value, and a sulfur content of the waste liquid. In an embodiment of the present invention, the seawater detection device 33 includes: the liquid flowmeter is used for detecting the flow of the waste liquid; a thermometer for detecting a temperature of the waste liquid; the seawater detector is used for monitoring the PA value, the PH value and the sulfur content of the waste liquid. The exhaust detection device 31 is connected to the exhaust emission pipeline 311, and is configured to collect the state information of the exhaust gas, where the state information of the exhaust gas includes a flow value, a temperature value, a pressure value, and a sulfur content of the exhaust gas. In an embodiment of the present invention, the exhaust gas detection device 31 includes: a gas flow meter for monitoring the exhaust gas flow; the thermometer is used for acquiring temperature information of the waste gas; the barometer is used for monitoring the waste air pressure value; and the gas detector is used for monitoring the sulfur content of the waste. The air intake detection device 32 is connected to the outlet end of the air intake pipeline 321, and is used for collecting the state information of the tail gas, wherein the state information of the tail gas comprises the air pressure value, the temperature value and the sulfur content of the tail gas.
The seawater supply control system 4 is in signal connection with the ship generator 21, the frequency converter 12, the three-way valve 22 and the detection system. The seawater supply control system 4 controls the flow rate of the seawater pumped by the seawater supply system 1 according to the state information of the exhaust gas, the waste gas and the waste liquid sent by the detection system and the power of the ship generator 21 in operation. Specifically, the seawater supply control system 4 generates a corresponding power increase instruction or power decrease instruction according to the sulfur content of the waste gas and the sulfur content of the waste liquid, and sends the corresponding power increase instruction or power decrease instruction to the frequency converter 12; and the frequency converter 12 drives the corresponding sea water pump 11 to increase or decrease the output power according to the power increasing instruction or the power decreasing instruction. The three-way valve 22 is controlled to be opened or closed by the seawater supply control system 4.
The alarm system 5 is in signal connection with the seawater supply control system 4; when any one of the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid exceeds the corresponding alarm threshold value, or any one of the temperature value, the atmospheric pressure value and the sulfur content of the exhaust gas exceeds the corresponding alarm threshold value, or any one of the atmospheric pressure value and the temperature value of the exhaust gas exceeds the corresponding alarm threshold value, the seawater supply control system 4 generates an alarm signal and a stop instruction. And the alarm system 5 performs sound-light alarm according to the received alarm signal. The three-way valve 22 in the open state closes in response to the stop instruction. And the frequency converter 12 drives the seawater pump 11 to stop working according to the stop working instruction.
The display system 6 is in signal connection with the seawater supply control system 4; the device is used for displaying the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, displaying the temperature value, the air pressure value and the sulfur content of the waste gas and displaying the air pressure value and the temperature value of the tail gas.
The data storage system 7 is in signal connection with the seawater supply control system 4 and is used for storing the temperature value, the pH value, the PHA value and the sulfur content of the waste liquid, the temperature value, the air pressure value and the sulfur content of the waste gas and the air pressure value and the temperature value of the tail gas.
A ship seawater desulfurization method is realized by adopting the ship seawater desulfurization system disclosed by the invention, and is shown in figure 2, and comprises the following steps:
s1, the seawater supply control system 4 acquires the operating state of the marine generator 21, generates a valve opening command for the three-way valve 22 corresponding to the marine generator 21 in operation, and drives the three-way valve 22 to open the valve according to the valve opening command; tail gas of the ship generator 21 enters the flue gas washing tower 8 through the corresponding air inlet pipeline 321 during operation;
s2, the seawater supply control system 4 sends a starting instruction to the frequency converter 12, the frequency converter 12 drives the corresponding seawater pump 11 to work according to the rated power according to the starting instruction, and the seawater pump 11 pumps seawater to the flue gas washing tower 8; carrying out desulfurization reaction on the seawater and the tail gas in a flue gas washing tower 8;
s3, collecting the flow value, temperature value, PH value, PHA value and sulfur content of the waste liquid in the waste liquid discharge pipeline 331 by the seawater detection device 33; the exhaust detection device 31 collects the flow value, temperature value, air pressure value and sulfur content of the exhaust gas in the exhaust gas discharge pipeline 311; the intake air detection device 32 acquires the air pressure value, the temperature value and the sulfur content of the tail gas in the intake pipeline 321; the data storage system 7 stores the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, stores the temperature value, the air pressure value and the sulfur content of the waste gas, and stores the air pressure value and the temperature value of the tail gas;
s4, when the sulfur content in the waste gas and the sulfur content in the waste liquid exceed a set first threshold value, the seawater supply control system 4 generates a power increase instruction and sends the power increase instruction to the frequency converter 12; the frequency converter 12 increases the output power of the seawater pump 11 according to the power increase instruction; when the sulfur content of the waste gas and the sulfur content of the waste liquid are lower than the set second threshold value, the seawater supply control system 4 generates a power reduction instruction and sends the power reduction instruction to the frequency converter 12; the frequency converter 12 reduces the output power of the corresponding sea water pump 11 according to the power reduction instruction; the second threshold is less than the first threshold.
S5, when any one of the temperature value, PH value, PHA value and sulfur content of the waste liquid exceeds its corresponding alarm threshold, or any one of the temperature value, air pressure value and sulfur content of the waste gas exceeds its corresponding alarm threshold, or any one of the air pressure value and temperature value of the tail gas exceeds its corresponding alarm threshold, the seawater supply control system 4 generates an alarm signal and a stop instruction; the alarm system 5 performs sound-light alarm according to the received alarm signal; the three-way valve 22 in the valve-open state closes according to the stop instruction; and the frequency converter 12 drives the corresponding seawater pump 11 to stop working according to the stop working instruction.
Compared with the prior art, the invention can ensure that sulfides in the waste gas and waste liquid discharged by the ship can reach the discharge standard, can accurately control the power of the seawater pump 11, realizes accurate control on the seawater desulfurization of the ship, greatly saves the working energy of the seawater pump 11, and is beneficial to increasing the cruising ability of the ship.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A marine seawater desulfurization system, comprising:
the ship power system comprises a plurality of ship generators and is used for providing power for ships and shipborne equipment;
a seawater supply system for extracting seawater;
tail gas generated by a ship generator enters a flue gas inlet at the lower end of the flue gas washing tower through a corresponding gas inlet pipeline; seawater pumped by the seawater supply system enters a seawater inlet at the upper end of the flue gas washing tower; the tail gas and the seawater are subjected to desulfurization reaction in the flue gas washing tower to generate waste liquid and waste gas; the waste gas is discharged to the atmosphere from a clean smoke discharge port at the upper end of the smoke washing tower through a waste gas discharge pipeline; the waste liquid is discharged to the sea from a waste liquid discharge port at the lower end of the flue gas washing tower through a waste liquid discharge pipeline;
the detection system is connected with the air inlet pipeline, the waste gas discharge pipeline and the waste liquid discharge pipeline and is used for acquiring and sending state information of the tail gas, the waste gas and the waste liquid;
the seawater supply control system is in signal connection with the ship power system, the seawater supply system and the detection system; and controlling the flow of the seawater extracted by the seawater supply system according to the state information of the tail gas, the waste gas and the waste liquid sent by the detection system and the power of the ship generator in work.
2. The marine seawater desulfurization system of claim 1, wherein the detection system comprises a seawater detection device, an intake air detection device, and an exhaust gas detection device; the seawater detection device is connected with the waste liquid discharge pipeline and is used for collecting the flow value, the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid; the exhaust detection device is connected with the exhaust emission pipeline and is used for collecting the flow value, the temperature value, the air pressure value and the sulfur content of the exhaust gas; the air inlet detection device is connected with the air inlet pipeline and is used for collecting the air pressure value, the temperature value and the sulfur content of the tail gas.
3. The marine seawater desulfurization system of claim 2, wherein the seawater supply system comprises: a plurality of seawater pumps and a plurality of frequency converters; the frequency converters are connected between the seawater pump and the seawater supply control system in a signal mode, and one frequency converter corresponds to one seawater pump; the seawater supply control system generates a corresponding power increase instruction or power decrease instruction according to the sulfur content of the waste gas and the sulfur content of the waste liquid and sends the power increase instruction or power decrease instruction to the frequency converter; and the frequency converter drives the corresponding sea water pump to increase or decrease the output power according to the power increasing instruction or the power decreasing instruction.
4. The seawater desulfurization system for ships of claim 3, wherein the air inlet pipeline is provided with a three-way valve, the three-way valve is in signal connection with the seawater supply control system, and the opening or closing of the three-way valve is controlled by the seawater supply control system; and tail gas generated by the ship generator enters the flue gas washing tower through a three-way valve of the corresponding air inlet pipeline.
5. The marine seawater desulfurization system of claim 4, further comprising an alarm system in signal connection with the seawater supply control system; when any one of the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid exceeds the corresponding alarm threshold value, or any one of the temperature value, the air pressure value and the sulfur content of the waste gas exceeds the corresponding alarm threshold value, or any one of the air pressure value and the temperature value of the tail gas exceeds the corresponding alarm threshold value, the seawater supply control system generates an alarm signal and a work stopping instruction; the alarm system carries out sound-light alarm according to the received alarm signal; the three-way valve in the valve opening state is closed according to the stop working instruction; and the frequency converter drives the seawater pump to stop working according to the received stop working instruction.
6. The marine seawater desulfurization system of claim 2, further comprising a display system in signal connection with the seawater supply control system; the device is used for displaying the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, displaying the temperature value, the air pressure value and the sulfur content of the waste gas and displaying the air pressure value and the temperature value of the tail gas.
7. The marine seawater desulfurization system of claim 2, further comprising a data storage system in signal connection with the seawater supply control system for storing the temperature value, PH value, PHA value, sulfur content of the waste stream, the temperature value, atmospheric pressure value, sulfur content of the exhaust gas, and the atmospheric pressure value, temperature value of the exhaust gas.
8. A method for desulfurizing seawater of a ship by using the seawater desulfurization system of any one of claims 1 to 7, comprising the steps of:
s1, the seawater supply control system acquires the working state of the ship generator, generates a valve opening command for a three-way valve corresponding to the ship generator in work, and drives the three-way valve to open through the valve opening command; tail gas of the ship generator enters the flue gas washing tower through the corresponding air inlet pipeline during operation;
s2, the seawater supply control system sends a starting instruction to the frequency converter, the frequency converter drives the corresponding seawater pump to start working according to the starting instruction and the rated power, and the seawater pump pumps seawater to the flue gas washing tower; carrying out desulfurization reaction on the seawater and the tail gas in a flue gas washing tower;
s3, collecting the flow value, temperature value, PH value, PHA value and sulfur content of the waste liquid in the waste liquid discharge pipeline by the seawater detection device; the exhaust detection device collects the flow value, temperature value, air pressure value and sulfur content of the exhaust gas in the exhaust gas discharge pipeline; the air inlet detection device acquires the air pressure value, the temperature value and the sulfur content of tail gas in an air inlet pipeline;
s4, when the sulfur content in the waste gas and the sulfur content in the waste liquid exceed a set first threshold value, the seawater supply control system generates a power increase instruction and sends the power increase instruction to the frequency converter; the frequency converter increases the output power of the seawater pump according to the power increase instruction; when the sulfur content of the waste gas and the sulfur content of the waste liquid are lower than a set second threshold value, the seawater supply control system generates a power reduction instruction and sends the power reduction instruction to the frequency converter; the frequency converter reduces the output power of the corresponding sea water pump according to the power reduction instruction; the second threshold is less than the first threshold.
9. The method for desulfurizing seawater of a marine vessel of claim 8, wherein the step S3 further comprises:
the data storage system stores the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid, stores the temperature value, the air pressure value and the sulfur content of the waste gas and stores the air pressure value and the temperature value of the tail gas.
10. The method for desulfurizing seawater of a marine vessel of claim 8, further comprising the steps of:
s5, when any one of the temperature value, the PH value, the PHA value and the sulfur content of the waste liquid exceeds the corresponding alarm threshold value, or any one of the temperature value, the air pressure value and the sulfur content of the waste gas exceeds the corresponding alarm threshold value, or any one of the air pressure value and the temperature value of the tail gas exceeds the corresponding alarm threshold value, the seawater supply control system generates an alarm signal and a stop working instruction; the alarm system carries out sound-light alarm according to the received alarm signal; the three-way valve in the valve opening state is closed according to the stop working instruction; and the frequency converter drives the corresponding seawater pump to stop working according to the stop working instruction.
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