WO2017010192A1 - Système de traitement de gaz d'échappement - Google Patents

Système de traitement de gaz d'échappement Download PDF

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Publication number
WO2017010192A1
WO2017010192A1 PCT/JP2016/066805 JP2016066805W WO2017010192A1 WO 2017010192 A1 WO2017010192 A1 WO 2017010192A1 JP 2016066805 W JP2016066805 W JP 2016066805W WO 2017010192 A1 WO2017010192 A1 WO 2017010192A1
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Prior art keywords
exhaust gas
temperature
water
control unit
discharged
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PCT/JP2016/066805
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English (en)
Japanese (ja)
Inventor
小松　正
邦幸 高橋
将隆 吉田
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富士電機株式会社
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Priority to JP2016569465A priority Critical patent/JPWO2017010192A1/ja
Publication of WO2017010192A1 publication Critical patent/WO2017010192A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/10—Conditioning the gas to be cleaned
    • 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
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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

Definitions

  • the present invention relates to a system for treating exhaust gas.
  • the exhaust gas has been desulfurized using seawater (see, for example, Patent Document 1).
  • seawater was sprayed to the exhaust gas to lower the temperature of the exhaust gas to the dew point temperature or less, solid particles such as soot and sulfuric acid mist were collected by an electrostatic precipitator (see, for example, Patent Document 2).
  • the temperature of the exhaust gas is adjusted in order to prevent the sulfur component in the exhaust gas from condensing in the electrostatic precipitator and causing corrosion of the electrostatic precipitator (for example, see Patent Document 3).
  • Patent Document 1 JP-A-2011-524800
  • Patent Document 2 JP-A-2009-052440
  • Patent Document 3 JP-A-2001-041663
  • the temperature of the exhaust gas entering the electrostatic precipitator is lower than the dew point temperature, there is a problem that the electrostatic precipitator is corroded. Therefore, it is desirable that the temperature of the exhaust gas entering the electrostatic precipitator be higher than the dew point temperature.
  • a system for treating exhaust gas.
  • the system for treating exhaust gas may comprise a temperature control unit.
  • the temperature control unit may lower the temperature of the discharged exhaust gas.
  • the system for treating the exhaust gas may comprise a dust collector.
  • the dust collector may collect particulates in the exhaust gas discharged from the temperature control unit.
  • the system for treating exhaust gas may comprise an exhaust gas treatment device.
  • the exhaust gas processing device may process the exhaust gas discharged from the dust collector.
  • the temperature control unit may adjust the discharged exhaust gas to a temperature higher than the sulfuric acid dew point temperature.
  • the temperature control unit may cool the discharged exhaust gas with a fluid.
  • the fluid may be liquid.
  • the liquid may be fresh water.
  • the liquid may be water obtained by condensing water contained in the exhaust gas.
  • the temperature control unit may control the flow rate of the fluid.
  • the temperature control unit may control the flow rate of the fluid based on the load of the motor.
  • the temperature adjustment unit may correct the flow rate of the fluid.
  • the temperature control unit may correct the flow rate of the fluid based on the difference between the measured temperature of the exhaust gas discharged from the temperature control unit and a predetermined temperature.
  • the exhaust gas treatment apparatus may process the exhaust gas by injecting cleaning water to the exhaust gas.
  • the system for treating exhaust gas may further comprise a heat exchanger.
  • the heat exchanger may produce the fluid by cooling the exhaust gas obtained from the exhaust gas treatment device.
  • the temperature control unit may cool the exhaust gas with the fluid generated by the heat exchanger.
  • the exhaust gas processing device may have an exhaust gas acquisition unit.
  • the exhaust gas acquisition unit may supply the exhaust gas to the heat exchanger.
  • the exhaust gas acquisition unit may have an opening in a direction different from the injection direction of the cleaning water for treating the exhaust gas. The opening may take in exhaust gases.
  • the exhaust gas acquisition unit may be provided at an intermediate point in the height direction of the exhaust gas processing device.
  • the exhaust gas processing device may have an exhaust gas reintroduction unit.
  • the exhaust gas reintroduction part may return the exhaust gas after being cooled in the heat exchanger to the same position or lower side as the exhaust gas acquisition part in the height direction of the exhaust gas processing device.
  • the exhaust gas treatment device may comprise a recovered water tank.
  • the recovered water tank may contain the fluid produced by the heat exchanger.
  • the recovered water tank may be a supply source of the fluid transported to the temperature control unit.
  • the fluid may be a gas.
  • the temperature control unit may adjust the discharged exhaust gas to a temperature lower than the spark temperature of the dust collector.
  • the temperature control unit may adjust the temperature of the discharged exhaust gas to a temperature lower than the spark temperature of the dust collector.
  • the spark temperature of the dust collector may decrease according to the length of time of operation of the dust collector.
  • FIG. 1 is a figure showing system 100 which processes exhaust gas in a 1st example. It is a figure which shows the detail of the temperature control part 10.
  • FIG. FIG. 2 is a view showing a configuration of an electrostatic precipitator 20. It is a figure which shows the relationship between the applied voltage in the electrostatic precipitator 20, and a discharge current. It is a figure which shows the modification of the temperature control part 10 and the electrostatic precipitator 20. As shown in FIG. It is a figure which shows the system 110 which processes waste gas in 2nd Example.
  • FIG. 1 is a diagram showing a system 100 for treating exhaust gas in the first embodiment.
  • the system 100 for treating exhaust gas removes harmful substances such as sulfur components contained in the exhaust gas discharged from an engine or the like of a ship.
  • the system 100 for treating exhaust gas includes a temperature control unit 10, an electrostatic precipitator 20, an exhaust gas treatment device 30, a heat exchanger 50, a recovery water tank 60, a recovery water pump 62, a temperature measurement unit 70, and a pumping pump 80.
  • the exhaust gas sources include a main engine for ship propulsion, an auxiliary engine for power generation, a boiler for steam supply, and the like.
  • the temperature of the exhaust gas discharged from the main engine for ship propulsion is, for example, 270.degree.
  • the temperature of the exhaust gas discharged from the auxiliary engine for power generation is, for example, 350 ° C.
  • Exhaust gas is discharged from the exhaust gas source to the temperature control unit 10.
  • the temperature control unit 10 lowers the temperature of the discharged exhaust gas.
  • the temperature control unit 10 adjusts the temperature of the exhaust gas to a temperature higher than the sulfuric acid dew point temperature.
  • the sulfuric acid dew point temperature is around 140 ° C. Therefore, the temperature control unit 10 may lower the temperature of the exhaust gas to a range of 180 ° C. to 260 ° C.
  • the temperature adjustment unit 10 lowers the temperature of the exhaust gas so that the target value becomes 220 ° C.
  • the supply water is supplied to the temperature control unit 10 from the recovered water pump 62.
  • the temperature control unit 10 reduces the temperature of the discharged exhaust gas by spraying the supplied water on the exhaust gas. That is, the temperature control unit 10 cools the exhaust gas.
  • the feed water in this example is a liquid, and is water obtained by condensing the water contained in the exhaust gas.
  • the feed water may be water generated in a boiler or rainwater stored in water.
  • water obtained by condensing water contained in exhaust gas, water generated in a boiler, and stored rainwater are collectively referred to as recovered water.
  • the recovered water is temporarily stored in the recovered water tank 60.
  • the liquid supplied from the recovered water tank 60 to the temperature control unit 10 via the recovered water pump 62 is referred to as feed water.
  • the temperature control unit 10 since the temperature control unit 10 lowers the temperature of the exhaust gas by gas-liquid contact between the feed water and the exhaust gas, the temperature of the exhaust gas can be lowered more simply and in a compact device than using a heat exchanger or the like.
  • the fluid which the temperature control part 10 uses for cooling of waste gas should just be liquid or gas.
  • the temperature control unit 10 may lower the temperature of the exhaust gas by adding air to the discharged exhaust gas.
  • the temperature control unit 10 may lower the temperature of the exhaust gas using a heat exchanger or the like. That is, the temperature control unit 10 may cool the discharged exhaust gas with a fluid.
  • Exhaust gas is discharged from the temperature control unit 10 to the electrostatic precipitator 20.
  • the temperature control unit 10 of this example adjusts the temperature of the exhaust gas discharged to the electrostatic precipitator 20 to a temperature higher than the sulfuric acid dew point temperature. Therefore, the electrostatic precipitator 20 is not exposed to liquefied sulfuric acid. Therefore, the corrosion of the electrostatic precipitator 20 can be prevented.
  • the electrostatic precipitator 20 collects particulates in the exhaust gas. Particulates include soot and dust.
  • the electrostatic precipitator 20 may have a discharge line to which a positive high voltage is applied and a pair of dust collection plates installed across the discharge line. In another example, the electrostatic precipitator 20 may have a pair of dust collection plates, a negative high electric field may be applied to one of the dust collection plates, and the other dust collection plate may be grounded. The details of the structure of the electrostatic precipitator 20 are omitted in FIG. In the electrostatic precipitator 20, charged fine particles in the exhaust gas are collected on the dust collection plate by Coulomb force.
  • the exhaust gas processing device 30 has a reaction tower 31, a nozzle 35, an exhaust gas introduction pipe 38, a washing water introduction pipe 39, an exhaust gas acquisition unit 40, an exhaust gas reintroduction blower 46 and an exhaust gas reintroduction pipe 48.
  • the exhaust gas acquisition unit 40 includes an exhaust gas suction blower 41 and an exhaust gas suction pipe 44.
  • the exhaust gas processing device 30 may be a marine exhaust gas processing device 30 installed on a ship. Exhaust gas is introduced into the exhaust gas processing device 30 from the electrostatic precipitator 20 through the exhaust gas introduction pipe 38.
  • the reaction tower 31 has an internal space extending in the height direction.
  • the height direction indicates a direction in which the bottom side 34 of the reaction tower 31 to which the exhaust gas is introduced extends in the upper side 32 to which the exhaust gas is discharged.
  • the exhaust gas processing device 30 is provided on a ship, the height direction is, for example, perpendicular to the floor of the ship or parallel to the gravity direction.
  • the exhaust gas introduction pipe 38 is located in the vicinity of the bottom side 34 of the reaction tower 31.
  • the exhaust gas introduction pipe 38 may be provided such that the exhaust gas introduced from the exhaust gas introduction pipe 38 spirally swirls along the inner side surface of the reaction tower 31.
  • the radius of the reaction tower 31 may be about 0.3 m to several m.
  • a wash water pipe 37 in which wash water 36 flows is disposed inside the reaction tower 31.
  • the washing water pipe 37 is disposed in the vicinity of the upper side 32 of the reaction tower 31.
  • the washing water pipe 37 of this example conveys the washing water 36 in the direction perpendicular to the height direction of the reaction tower 31.
  • the washing water pipe 37 is supplied with washing water 36 from a suction pump 80.
  • the washing water pipe 37 is provided with a nozzle 35.
  • the nozzle 35 jets the washing water 36 from the top side 32 to the bottom side 34 with respect to the exhaust gas to process the exhaust gas.
  • the washing water 36 supplied to the washing water pipe 37 by the pumping pump 80 may be seawater, lake water, river water, or the like.
  • the washing water 36 injected from the nozzle 35 contacts the exhaust gas passing through the inside of the reaction tower 31, and absorbs the sulfur component and the like contained in the exhaust gas.
  • the liquid having absorbed the sulfur component and the like is accumulated on the bottom side 34 of the reaction tower 31 and discharged to the outside of the reaction tower 31 as drainage.
  • the exhaust gas suction pipe 44 of the exhaust gas acquisition unit 40 has an opening 42 for taking in the exhaust gas in the reaction tower 31. In the vicinity of the opening 42, the exhaust gas is cooled by the washing water 36 and reaches about 60.degree. About 20 vol% of the exhaust gas at about 60 ° C. is water.
  • the opening 42 is positioned to take in the exhaust gas in a direction different from the injection direction of the cleaning water 36 for treating the exhaust gas.
  • the injection direction of the washing water 36 is downward, while the opening 42 of the exhaust gas suction pipe 44 takes the exhaust gas upward.
  • the opening 42 may be oriented so as not to take in the washing water 36.
  • the opening 42 of this example is located in the opposite direction to the height direction of the reaction tower 31 in order to take in the exhaust gas upward. That is, the opening 42 of this example faces the bottom side 34 of the reaction tower 31.
  • the injection direction of the washing water 36 is also in the direction of injection to the bottom side 34.
  • the exhaust gas acquisition unit 40 can acquire only the exhaust gas without acquiring the washing water 36 from the inside of the reaction tower 31.
  • the downward and downward directions are directions from the top side 32 to the bottom side 34 of the exhaust gas processing device 30. Upward and downward directions are opposite to downward and downward directions.
  • the exhaust gas acquisition unit 40 is provided at an appropriate position between the upper side 32 and the lower side 34.
  • the exhaust gas acquisition unit 40 is provided between the upper side 32 and the lower side 34.
  • the exhaust gas acquisition unit 40 may be provided at an intermediate point in the height direction of the exhaust gas processing device 30. The middle point may be 40% to 60% of the length from the bottom of the bottom side 34 to the position where the nozzle 32 on the top side 32 is provided, even if it is 45% to 55% Good. Since the temperature of the exhaust gas is low near the upper side 32, the amount of water contained in the exhaust gas is smaller than that of the bottom side 34. Therefore, it is not preferable that the position of the exhaust gas acquisition unit 40 approaches the upper side 32 too much. In the vicinity of the bottom side 34, the exhaust gas contains more sulfur components than the top side 32. Therefore, it is not preferable that the position of the exhaust gas acquisition unit 40 approaches the bottom side 34 too much.
  • the exhaust gas acquisition unit 40 supplies the acquired exhaust gas to the heat exchanger 50.
  • the heat exchanger 50 cools the exhaust gas acquired from the exhaust gas acquisition unit 40 to generate a fluid (in this example, recovered water and feed water).
  • the heat exchanger 50 cools the exhaust gas acquired by the exhaust gas acquisition unit 40 by the cleaning water 36 supplied through the cleaning water pipe 37. The moisture of the exhaust gas becomes recovered water after being cooled in the heat exchanger 50.
  • the sulfur content of the recovered water can be less than the distilled water obtained by condensing the exhaust gas before being treated with the wash water 36.
  • the exhaust gas acquired by the exhaust gas acquisition unit 40 contains nitrogen, carbon dioxide and sulfur components in addition to water. Among these components, gas components not dissolved in the recovered water are sucked by the exhaust gas reintroduction blower 46 and returned to the reaction tower 31 as exhaust gas through the exhaust gas reintroduction pipe 48.
  • the exhaust gas reintroduction blower 46 returns the cooled exhaust gas to the same position as the exhaust gas acquisition unit 40 in the height direction, or to the bottom side 34 of the exhaust gas acquisition unit 40 in the height direction. That is, the exhaust gas reintroduction blower 46 returns the cooled exhaust gas to the lower side than the exhaust gas acquisition unit 40 in the height direction. Thereby, the exhaust gas can be cleaned again.
  • the opening of the exhaust gas reintroduction pipe 48 is positioned to reintroduce the exhaust gas in the same direction as the injection direction of the cleaning water 36 for treating the exhaust gas.
  • the injection direction of the washing water 36 is downward, while the opening of the exhaust gas reintroduction pipe 48 reintroduces the exhaust gas downward.
  • the opening of the exhaust gas reintroduction pipe 48 may be oriented so as not to take in the washing water 36.
  • the opening of the exhaust gas reintroduction pipe 48 in this example is located in the opposite direction to the height direction of the reaction tower 31 in order to reintroduce the exhaust gas downward. That is, the opening of the exhaust gas reintroduction pipe 48 of this example faces the bottom side 34 of the reaction tower 31.
  • the injection direction of the washing water 36 is also in the direction of injection to the bottom side 34.
  • the exhaust gas reintroduction pipe 48 can prevent the cleaning water 36 from being taken in from the reaction tower 31.
  • the recovered water generated by the heat exchanger 50 is accommodated in the recovered water tank 60.
  • the recovered water tank 60 functions as a supply source of feed water.
  • the recovered water pump 62 pumps the recovered water from the recovered water tank 60 and conveys it to the temperature control unit 10 as feed water.
  • the temperature control unit 10 can spray the recovered water (supply water) generated by the heat exchanger 50 on the exhaust gas.
  • seawater is directly sprayed to the exhaust gas
  • salts contained in the seawater are transported together with the exhaust gas, which adversely affects the electrostatic precipitator 20.
  • the temperature control unit 10 sprays the recovered water (supply water) generated by the heat exchanger 50 on the exhaust gas, it is possible to prevent salts from being captured by the electrostatic precipitator 20.
  • the recovered water may be fresh water. In the present specification, fresh water refers to water having a salt concentration of 0.05% or less. Further, the recovered water may be water obtained by condensing water contained in the exhaust gas.
  • FIG. 2 is a diagram showing the details of the temperature control unit 10.
  • the temperature adjustment unit 10 includes a control unit 12 and an evaporator 17.
  • Control unit 12 includes a first processing unit 13 and a second processing unit 15.
  • the evaporator 17 includes one or more nozzles 18.
  • the first processing unit 13 calculates the flow rate of the supplied water based on the load of an engine such as a main engine for ship propulsion, an auxiliary engine for power generation, and a boiler for steam supply.
  • the first processing unit 13 of the present embodiment has the standard exhaust gas temperature (° C.) and exhaust gas flow rate (m 3 / h) at the load factor of the motor, and the supply water required to lower the exhaust gas to the set temperature of the evaporator 17 And a table in which the relationship with the flow rate (m 3 / h) is recorded.
  • the first processing unit 13 of this example adjusts the flow rate of the feed water corresponding to the load of the motor with reference to the table.
  • the first processing unit 13 outputs a flow rate adjustment signal to the adder 16 in order to adjust the flow rate of the feed water to a specific flow rate.
  • the temperature measurement unit 70 measures the temperature T of the exhaust gas discharged from the temperature adjustment unit 10 at the outlet of the evaporator 17 near the electrostatic precipitator 20 in the evaporator 17.
  • the second processing unit 15 acquires the temperature of the exhaust gas measured by the temperature measurement unit 70.
  • the second processing unit 15 also acquires a set temperature, which is a temperature predetermined in the evaporator 17.
  • the second processing unit 15 calculates the flow rate (m 3 / h) of the feed water based on the difference between the measurement temperature T and the set temperature of the evaporator 17.
  • the second processing unit 15 of this example increases the flow rate of the supplied water when the measured temperature T is higher than the set temperature, and reduces the flow rate of the supplied water when the measured temperature T is lower than the set temperature. Compensate for the flow rate of the feed water.
  • the second processing unit 15 outputs the flow rate of the feed water to be compensated to the adder 16 as a flow rate compensation signal.
  • the control unit 12 corrects the flow rate of the supplied water to be sprayed, based on the flow rate adjustment signal from the first processing unit 13 and the flow rate compensation signal from the second processing unit 15. Specifically, the adder 16 adds the flow rate adjustment signal from the first processing unit 13 and the flow rate compensation signal from the second processing unit 15 and outputs a flow rate control signal to the recovered water pump 62.
  • the control unit 12 can control the load of the motor and the flow rate of the feed water sprayed onto the exhaust gas in consideration of the difference between the measured temperature T and the set temperature. Therefore, the controllability of the flow rate of the feed water sprayed to the exhaust gas by the evaporator 17 is improved.
  • the recovered water generated by the heat exchanger 50 is temporarily stored in the recovered water tank 60, the recovered water tank 60 exhibits a function as a buffer, and the evaporator 17 sprays the exhaust gas. Flow controllability can be improved.
  • FIG. 3 is a view showing the configuration of the electric dust collector 20.
  • the electrostatic precipitator 20 of this example has a pair of dust collection plates 22.
  • the pair of dust collection plates 22 are metal plates that function as electrodes.
  • a negative high voltage is applied to one of the dust collection plates 22-1 by the power supply 25, and the other dust collection plate 22-2 is grounded. Thereby, a high electric field area is formed between the pair of dust collection plates 22.
  • the fine particles in the exhaust gas are positively or negatively charged between the pair of dust collection plates 22.
  • the positively charged fine particles are collected on the dust collection plate 22-1 by the Coulomb force, and the negatively charged fine particles are collected on the dust collection plate 22-2 by the Coulomb force.
  • FIG. 4 is a diagram showing the relationship between the applied voltage and the discharge current in the electrostatic precipitator 20. As shown in FIG. The horizontal axis represents applied voltage (-kV), and the vertical axis represents discharge current (mA) flowing between the pair of dust collection plates. The increase in the applied voltage ( ⁇ kV) will be expressed below as the absolute value of the applied voltage increases.
  • the temperature of the exhaust gas indicated by the solid line is 350 ° C., 300 ° C., 250 ° C. and 220 ° C., respectively.
  • the temperature of the exhaust gas is 350 ° C.
  • no discharge current flows even if a voltage of ⁇ 6 kV is applied to one of the dust collection plates.
  • the applied voltage is gradually increased and a voltage of -8 kV is applied to one of the dust collection plates, a spark is generated. Sparks are similar to lightning.
  • the value of the discharge current increases as the absolute value of the applied voltage increases. This means that the number of microparticles per unit volume that can be collected increases. That is, the dust collection rate becomes higher as the absolute value of the applied voltage increases.
  • the temperature control unit 10 reduces the temperature of the exhaust gas.
  • the voltage applied to the dust collection plate 22-1 of the electrostatic precipitator 20 of this embodiment may be a predetermined value. For example, a voltage of -12 kV is applied to the dust collection plate 22-1.
  • the temperature control unit 10 of the present example adjusts the discharged exhaust gas to a temperature lower than the spark temperature of the electrostatic precipitator 20.
  • the temperature control unit 10 adjusts the temperature of the exhaust gas discharged to the electrostatic precipitator 20 to a temperature of 220 ° C. or more and less than 250 ° C. Thereby, the generation of sparks in the electrostatic precipitator 20 can be prevented.
  • FIG. 5 is a view showing a modification of the temperature control unit 10 and the electrostatic precipitator 20.
  • the temperature adjustment unit 10 of this example further includes a third processing unit 19.
  • the third processing unit 19 acquires information on the operation time of the electrostatic precipitator 20 from the electrostatic precipitator 20.
  • the third processing unit 19 converts the information on the operation time of the electrostatic precipitator 20 into a second flow rate compensation signal for compensating the flow rate of the added water.
  • the flow rate compensation signal output from the second processing unit 15 to the adder 16 is distinguished from the second flow rate compensation signal as the first flow rate compensation signal.
  • the electrostatic precipitator 20 reduces the temperature at which a spark starts (referred to as a spark temperature in the present specification) according to the length of operation time. For example, at the beginning of use, an applied voltage of -12 kV was applied to the dust collection plate 22-1, and even if exhaust gas at 220 ° C was flowed between the pair of dust collection plates 22, sparks were not generated. Sparking may occur even under the same conditions as time operation.
  • the operation time of the electrostatic precipitator 20 becomes long, the collected particulates are deposited. When the layer of the deposited fine particles is formed, the distance between the pair of dust collection plates 22 becomes short, which makes it easier to spark. Therefore, spark temperature falls in the electric precipitator 20 which became long in operation time.
  • the temperature adjustment unit 10 may adjust the temperature of the exhaust gas to a temperature lower than the spark temperature of the electrostatic precipitator, which decreases according to the length of operation time of the electrostatic precipitator 20.
  • the third processing unit 19 increases the flow rate of the supplied water in order to further cool the exhaust gas in the evaporator 17 in proportion to the operation time of the electrostatic precipitator 20.
  • the third processing unit 19 inputs a second flow compensation signal to the adder 16 in order to increase the flow rate of the supply water in proportion to the operation time of the electrostatic precipitator 20.
  • the operation time can be reset after the step.
  • FIG. 6 is a diagram showing a system 110 for treating exhaust gas in the second embodiment.
  • the system 110 of this example includes a neutralization tank 92 and a pumping pump 90 in place of the pumping pump 80 for pumping seawater and the like.
  • the waste water pumped up by the pumping pump 90 is recycled and used as the washing water 36 for reprocessing the exhaust gas.
  • the point which concerns is different from 1st Example. The other points are the same as in the first embodiment.
  • the neutralization tank 92 performs an alkali treatment on the waste water generated by treating the exhaust gas in the exhaust gas treatment device 30 to neutralize it.
  • the pump pump 90 pumps up the wastewater neutralized by the neutralization tank 92 and supplies it to the flush water pipe 37.
  • drainage can be circulated and used.
  • the system 100 or 110 is mounted on a ship.
  • the system 100 according to the first embodiment releases waste water to the sea etc. after neutralizing the pH to a certain value or more in compliance with the environmental standard. If the vessel equipped with the system 100 is underway, there is no problem in discharging the neutralized wastewater into the sea. However, when the ship equipped with the system 100 is anchored in a port or the like, the drainage will continue to be discharged to a specific location, which is not preferable.

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Abstract

Il y a un problème selon lequel un collecteur de poussière électrique est corrodé par l'acide sulfurique liquéfié lorsque la température de gaz d'échappement entrant dans le collecteur de poussière électrique est la température de point de rosée de l'acide sulfurique ou moins. Par conséquent, la présente invention empêche un collecteur de poussière électrique d'être corrodé. L'invention concerne un système de traitement de gaz d'échappement, le système comprenant : une unité de réglage de température pour réduire la température du gaz d'échappement évacué ; un collecteur de poussière pour collecter des particules fines dans le gaz d'échappement évacué de l'unité de réglage de température ; et un dispositif de traitement de gaz d'échappement pour traiter le gaz d'échappement évacué du collecteur de poussière. L'unité de réglage de température règle le gaz d'échappement évacué à une température supérieure à la température de point de rosée de l'acide sulfurique.
PCT/JP2016/066805 2015-07-15 2016-06-06 Système de traitement de gaz d'échappement WO2017010192A1 (fr)

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JP2015141472 2015-07-15

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2022049917A1 (fr) * 2020-09-04 2022-03-10 富士電機株式会社 Dispositif de traitement de gaz d'échappement

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JP2006326575A (ja) * 2005-04-26 2006-12-07 Mitsubishi Heavy Ind Ltd 排ガス処理装置および排ガス処理方法
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JPH09239235A (ja) * 1996-03-08 1997-09-16 Ishikawajima Harima Heavy Ind Co Ltd 高濃度硫黄酸化物処理システム
JP2000512899A (ja) * 1997-02-15 2000-10-03 プロイセンエレクトラ エンジニアリング ゲー エム ベー ハー 排気ガス浄化システム中における硫酸エーロゾル形成の抑制方法
JP2001327830A (ja) * 2000-05-22 2001-11-27 Ishikawajima Harima Heavy Ind Co Ltd 排煙処理装置
JP2006326575A (ja) * 2005-04-26 2006-12-07 Mitsubishi Heavy Ind Ltd 排ガス処理装置および排ガス処理方法
WO2014045578A1 (fr) * 2012-09-19 2014-03-27 川崎重工業株式会社 Dispositif de nettoyage humide, système de moteur thermique et navire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021109811A (ja) * 2020-01-14 2021-08-02 住友金属鉱山株式会社 水酸化ニッケル粒子の焼成方法及びこれを用いた酸化ニッケル微粉末の製造方法
WO2022049917A1 (fr) * 2020-09-04 2022-03-10 富士電機株式会社 Dispositif de traitement de gaz d'échappement

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