WO2017022529A1 - Centrifugal separator and method for operating same - Google Patents

Centrifugal separator and method for operating same Download PDF

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Publication number
WO2017022529A1
WO2017022529A1 PCT/JP2016/071605 JP2016071605W WO2017022529A1 WO 2017022529 A1 WO2017022529 A1 WO 2017022529A1 JP 2016071605 W JP2016071605 W JP 2016071605W WO 2017022529 A1 WO2017022529 A1 WO 2017022529A1
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WO
WIPO (PCT)
Prior art keywords
turbidity
scrubber
initial
scrubber water
solid component
Prior art date
Application number
PCT/JP2016/071605
Other languages
French (fr)
Japanese (ja)
Inventor
裕二 佐野
雄輔 渡辺
尚史 桶谷
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201680044826.5A priority Critical patent/CN107921446B/en
Priority to KR1020187002942A priority patent/KR102110055B1/en
Publication of WO2017022529A1 publication Critical patent/WO2017022529A1/en
Priority to DKPA201800050A priority patent/DK180120B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
    • B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke

Definitions

  • the present invention relates to a centrifuge for an exhaust gas scrubber and an operation method thereof, and more particularly to a centrifuge applied to an exhaust gas scrubber used for dust removal treatment of exhaust gas such as a marine diesel engine and an operation method thereof.
  • exhaust gas is removed using an exhaust gas scrubber. Since the dust removal water circulating through the exhaust gas scrubber (hereinafter referred to as “scrubber water”) contains particulate matter such as unburned carbon, the particulate matter is separated from the scrubber water using, for example, centrifugation. It has been removed. Particulate matter accumulates as a solid component on the maximum diameter in the separation chamber under the centrifugal force of the centrifuge, so the solid component is intermittent with the scrubber water from the discharge port formed in the maximum diameter in the separation chamber. Discharged to the outside. Since scrubber water containing solid components cannot be dumped into the ocean as it is, it is stored as waste in the ship.
  • Patent Document 1 describes a technique for minimizing waste generated from a centrifuge.
  • the turbidity of the scrubber water after the dust removed in the centrifuge is measured using a turbidimeter.
  • waste generated in the centrifuge is reduced. That is, the concentration or amount of the solid component deposited in the separation chamber of the centrifuge is monitored by monitoring the turbidity of the scrubber water after processing in the centrifuge.
  • Patent Document 1 also points out that it is important to minimize the amount of waste.
  • the turbidity of the scrubber water also changes because the content of the particulate matter such as unburned carbon contained in the exhaust gas changes depending on the load state of the marine diesel engine.
  • the processing capacity of the centrifuge is constant, the higher the solid component concentration of the scrubber water flowing into the centrifuge, the higher the separation efficiency of the centrifuge, and the solid component of the scrubber water flowing into the centrifuge If the concentration is low, the separation efficiency of the centrifuge decreases. Therefore, the turbidity of the scrubber water after treatment by the centrifuge varies, and this turbidity does not necessarily correspond to the solid component concentration or amount in the separation chamber.
  • the time required for the solid component to be discharged from the separation chamber varies due to the turbidity of the scrubber water flowing into the centrifuge.
  • concentration of the solid component in the separation chamber is high, it is difficult to discharge the solid component unless the solid component is discharged early.
  • concentration of the solid component in the separation chamber is low, it is necessary to wait until the concentration becomes high.
  • the present invention has been made to solve the above-mentioned problems, and with a simple configuration, the solid component concentration in the waste discharged from the separation chamber of the centrifuge is stabilized at a high concentration, and the amount of waste discharged is reduced. It is an object of the present invention to provide a centrifuge and an operation method thereof that can reduce the storage space as waste.
  • the centrifuge of the present invention separates the solid component from the scrubber water by applying centrifugal force to the scrubber water containing the solid component supplied into the separation chamber rotating from the exhaust gas scrubber under the control of the system controller.
  • the centrifuge measures the turbidity of the scrubber water after treatment with a turbidimeter, and opens the valve based on the measured value of the turbidimeter to intermittently discharge the solid component as waste from the separation chamber.
  • the separator is a turbidimeter, and for each of a plurality of scrubber waters having different turbidities in advance, the first turbidity immediately after the start of the treatment of the scrubber water is measured as an initial turbidity and The scrubber water discharged from the separation chamber when the solid component in the waste discharged from the separation chamber in a continuous process after measuring the initial turbidity reaches a predetermined concentration While the second turbidity is measured, the system controller determines the difference between the second turbidity and the initial turbidity for each of a plurality of scrubber waters having different initial turbidity based on the measured value.
  • the turbidity when discharging the solid component from the ⁇ NTU in the discharge trigger table corresponding to this initial turbidity is the discharge standard. It comprises a central processing unit, a seeking as is characterized in.
  • the emission standard value is an addition value of the initial turbidity and the ⁇ NTU.
  • the valve is opened to discharge solid components in the separation chamber.
  • the operation method of the centrifuge of the present invention is such that, under the control of the system controller, a centrifugal force is applied to the scrubber water containing the solid component supplied from the exhaust gas scrubber to the solid material from the scrubber water.
  • the components are separated, the turbidity of the scrubber water after treatment is measured with a turbidimeter, the valve is opened based on the measured value of the turbidimeter, and the solid component is intermittently discharged as waste from the separation chamber.
  • a method of operating a centrifugal separator for discharging wherein the method of operating the centrifugal separator comprises an operation preparation step of the centrifugal separator and an operation execution step of the centrifugal separator, and the operation
  • the preparation step measures the first turbidity immediately after the start of the treatment as the initial turbidity for each of the plurality of scrubber waters having different turbidities in advance. And the initial turbidity discharged from the separation chamber when the solid component in the waste discharged from the separation chamber reaches a predetermined concentration in the continuous process after measuring the initial turbidity.
  • a step of measuring the second turbidity of each of the plurality of scrubber waters a step of obtaining a difference between the second turbidity and the initial turbidity as ⁇ NTU for each of the plurality of scrubber waters having different initial turbidities,
  • the initial turbidity of each of the plurality of scrubber waters having different initial turbidities is classified into a plurality of groups according to the respective sizes, and the ⁇ NTU corresponding to the initial turbidity of each of the plurality of groups and each initial turbidity.
  • a step of setting the discharge trigger table in the system controller, and the operation execution step includes the scrubber water.
  • the ⁇ NTU when the initial turbidity is small, the ⁇ NTU is set large, and when the initial turbidity is large, the ⁇ NTU is set small.
  • an addition value of the initial turbidity and the ⁇ NTU corresponding to the initial turbidity is used as the emission reference value.
  • the solid component concentration in the waste discharged from the separation chamber of the centrifuge can be stabilized at a high concentration with a simple configuration, and the amount of waste discharged can be reduced and stored as waste.
  • a centrifuge capable of reducing space and an operation method thereof can be provided.
  • FIG. 1 is a configuration diagram showing an embodiment of a centrifuge of the present invention applied to a scrubber.
  • FIG. 2 is a schematic diagram showing a main part of the centrifuge shown in FIG.
  • the centrifugal separator 10 of the present embodiment is connected to an exhaust gas exhaust gas scrubber 30 via a first circulation pipe 40, and scrubber water after dust removal in the exhaust gas scrubber 30 is not treated. While circulating through the first circulation pipe 40 as the scrubber water W, the particulate matter is separated by the centrifugal separator 10, and the treated scrubber water W ′ is returned to the exhaust gas scrubber 30 through the first circulation pipe 40. It is.
  • the first circulation pipe 40 includes a first pipe 41 and a second pipe 42 connected to the first pipe 41.
  • a separation plate type centrifugal separator is used as the centrifugal separator 10.
  • the exhaust gas scrubber 30 is connected to the diesel engine 50 via the second circulation pipe 60. Exhaust gas scrubber 30 is dedusted exhaust gas from the diesel engine 50, diesel engine 50 reduces the NO X, etc. of the combustion gas by air clean exhaust gas after dust removal again.
  • the centrifugal separator 10 is provided in the second pipe 42, and applies centrifugal force to the untreated scrubber water W supplied from the first pipe 41 to derive from the exhaust gas contained in the scrubber water W.
  • the particulate matter is separated as a solid component, and the clean scrubber water W ′ after the treatment is returned to the exhaust gas scrubber 30.
  • the exhaust gas scrubber 30 removes particulate matter from the exhaust gas from the diesel engine 50 via the scrubber water W.
  • a feeding means such as a pump for circulating the scrubber water W or the exhaust gas is omitted in the drawing.
  • the scrubber water W supplied from the exhaust gas scrubber 30 to the centrifuge 10 is referred to as a scrubber water W before the treatment
  • the clean scrubber water W ′ after the treatment by the centrifuge 10 is the scrubber water after the treatment. Called W ′.
  • the exhaust gas scrubber various types of conventionally known scrubbers can be used.
  • the untreated scrubber water W circulating through the first pipe 41 and the treated scrubber water W ′ from the centrifuge 10 merge in the first pipe 41.
  • the particulate matter sprayed into the exhaust gas scrubber 30 through the spray nozzle 31 connected to 41 and suspended in the internal exhaust gas is captured and removed.
  • a scrubber or the like that sprays scrubber water W onto the filler and removes particulate matter with a liquid film on the surface of the filler can be used.
  • a sampling pipe 70 for sampling the processed scrubber water W ′ is connected to the second pipe 42 of the first circulation pipe 40 of the centrifuge 10.
  • the sampling pipe 70 is provided with an air separator 71 for performing defoaming processing of the scrubber water W ′ after processing.
  • a turbidimeter 72 is provided on the downstream side of the air separator 71 in the sampling pipe 70. Therefore, after the air separator 71 degass the treated scrubber water W ′, the turbidimeter 72 can measure the turbidity of the treated scrubber water W ′ with high accuracy.
  • the turbidimeter 72 detects the turbidity as an analog signal, and this analog signal is converted into a digital signal by the system controller 17.
  • a signal is transmitted from the system controller 17 to the valve opening / closing mechanism, the discharge port of the centrifugal separator 10 is opened, and the solid component is converted into scrubber water.
  • the waste is discharged together and stored in the collection tank 80.
  • the waste in the collection tank 80 reaches a predetermined amount, the waste is transferred to another storage location via the pump 81.
  • the centrifugal separator 10 includes an inflow pipe 11 into which the untreated scrubber water W flows from the exhaust gas scrubber 30, a rotating cylinder (not shown) whose upper end is open, A rotating body lid 12 that is fitted into the upper end opening of the rotating body to form a rotating body, a partition plate 13 that is disposed with a gap with respect to the inner surface of the rotating body cover 12, and a state that is inserted into the rotating body
  • the main valve 14 moves up and down as shown by the arrows to open and close a discharge port (not shown) formed on the side of the rotary drum, and the separation chamber 15 formed between the main valve 14 and the partition plate 13.
  • the separation chamber 15 is introduced from the inflow pipe 11 through the guide tube 18.
  • the scrubber water W before a process is supplied in the inside. Since the particulate matter has a specific gravity greater than that of the scrubber water, when the centrifugal force is applied in the separation chamber 15, the particulate matter is centrifuged as the solid component S from the scrubber water by the separation plate 16.
  • the treated scrubber water W ′ in the separation chamber 15 is discharged to the outside through the centripetal pump 19 and the outflow pipe 20.
  • the scrubber water W ′ after processing indicates a thinly painted area
  • the solid component S indicates a darkly painted area.
  • the solid component S is a discharge port (not shown) formed in the maximum diameter portion of the separation chamber 15.
  • a recess containing An interface I is formed between the scrubber water W ′ after treatment and the solid component S. Then, a very small part of the solid component S at the interface I moves along the flow of the scrubber water W ′ after the treatment and moves in the direction of the arrow, and is mixed with the scrubber water W ′ after the treatment and becomes turbid. Is discharged to the outside.
  • the turbidity of the scrubber water W ′ after the treatment can be measured with a turbidimeter.
  • the centripetal pump 19 faces into the chamber 23 formed at the upper end of the partition plate 13 and discharges the processed scrubber water W ′ that overflows from the separation chamber 15 and accumulates in the chamber 23. Since the interface I between the solid component S and the scrubber water W ′ after processing proceeds toward the center of the separation chamber 15 with the passage of time, the solid component S needs to be discharged from the separation chamber 15. By opening a discharge port formed in the side portion of the rotating drum, the solid component S is discharged together with a part of the scrubber water W ′ after processing in the separation chamber 15 to become waste. If the concentration of the solid component S in the waste is low, the amount of waste increases. Conversely, if the concentration of the solid component S is high, it is difficult to discharge from the outlet.
  • discharge trigger a trigger that opens the discharge port of the separation chamber 15 in accordance with the change in turbidity of the scrubber water W before treatment. The solid component concentration in the waste can be stabilized and the minimum amount of waste can be discharged reliably.
  • the operation method of the centrifuge of the present embodiment includes an operation preparation step for preparing various data such as initial turbidity necessary for the operation, and an operation for performing the operation using the data obtained in the operation preparation step. Implementation steps are provided.
  • the discharge trigger is set according to the following procedure. In order to set the discharge trigger, a plurality of scrubber waters having different turbidities are prepared as the scrubber water W before treatment. The pre-treatment scrubber water W having a certain turbidity prepared in advance is separated from the solid component by the centrifugal separator 10, and the turbidity of the treated scrubber water W ′ immediately after the start of the treatment is measured.
  • the turbidity immediately after the start of the treatment is defined as the initial turbidity.
  • the initial turbidity of the scrubber water W ′ after a certain turbidity treatment is measured using a turbidimeter 72. Further, the turbidity of the scrubber water W ′ after the treatment is appropriately measured at an appropriate timing during the subsequent treatment, and immediately after that, the solid component S is discarded from the separation chamber 15 together with the scrubber water W ′ after the treatment. It is discharged as a product and the concentration of solid components in this waste is measured.
  • the timing for measuring the turbidity of the scrubber water W ′ after treatment is changed as appropriate, and the solid component concentration measurement value (analysis value) of the waste at a certain timing is a predetermined concentration (for example, 7% by weight).
  • the turbidity of the scrubber water W ′ after treatment at that time is measured by the turbidimeter 72 and recorded.
  • the difference between the turbidity of the scrubber water W ′ after the treatment and the initial turbidity when the solid component concentration of the waste reaches a predetermined concentration of 7% by weight is defined as a turbidity difference ( ⁇ NTU).
  • the initial concentration and the solid component concentration of each of the subsequent wastes for a plurality of pre-treatment scrubber waters W having different turbidities in advance ⁇ NTU is calculated and recorded from the difference from the turbidity of the scrubber water W ′ after the treatment when reaches a predetermined concentration of 7% by weight.
  • the solid component concentration in the above-mentioned predetermined waste can be appropriately changed depending on the operating conditions.
  • the initial turbidity of each of a plurality of different pre-treatment scrubber waters W is measured in a range of 0 to 3000, for example, and the initial turbidity is divided into, for example, every 200 within this range.
  • the turbidity ranges are classified into a plurality of groups such as 0 to 200, 201 to 400, ..., 2801 to 3000.
  • the entire range of the initial turbidity and the number of groups thereof are appropriately set based on the assumed operating environment such as the turbidity of the scrubber water W before treatment, the specifications (measurement range, error) of the turbidimeter 72, and the like.
  • Table 1 a plurality of groups obtained by dividing the initial turbidity every 200 are entered in the upper part of the table, and ⁇ NTU for each initial turbidity group is entered in the lower part of the table.
  • Table 1 created in this way is defined as a discharge trigger table.
  • the discharge trigger table is obtained in advance based on measurement data such as turbidity in the operation preparation step, and is set in the system controller 17.
  • the discharge trigger table created as shown in Table 1 is stored in advance in the memory 17A of the system controller 17 and used in the operation execution step of the operation method of the centrifuge 10 of the present embodiment.
  • the operator refers to the discharge trigger table shown in Table 1 and, for example, when the initial turbidity is small, the operator determines that the solid component S accumulated in the recess in the separation chamber 15 is small, and sets a large ⁇ NTU on the system controller 17. On the contrary, when the initial turbidity is large, it is determined that the solid component S in the recess in the separation chamber 15 is large, and a small ⁇ NTU is allocated on the system controller 17.
  • the operator When carrying out the operation method of the centrifuge, the operator sets the initial turbidity of the scrubber water W ′ after the treatment immediately after the start of the operation of the centrifuge 10 or immediately after the discharge of the solid component S from the centrifuge 10 is completed.
  • the system controller 17 automatically controls the opening / closing timing of the valve opening / closing mechanism 25 based on the comparison result between the discharge reference value and the measured value of the turbidimeter 72.
  • the system controller 17 When the measured value of the turbidimeter 72 reaches the discharge reference value, the system controller 17 outputs an open signal to the valve opening / closing mechanism 25.
  • the valve opening / closing mechanism 25 opens a predetermined valve (not shown), supplies valve opening operation water, moves the main valve 14 downward, and opens the discharge port of the separation chamber 15.
  • the deposited solid component S is discharged toward the collection tank 80. Thereafter, the valve is closed and the valve opening water is stopped.
  • a valve (not shown) is operated based on the closing signal to supply the valve closing operation water, close the main valve 14 and stop the valve closing operation water.
  • the unburned particulate matter in the exhaust gas is mixed and suspended in the scrubber water in the exhaust gas scrubber 30.
  • the untreated scrubber water W from the exhaust gas scrubber 30 circulates through the first pipe 41 of the first circulation pipe 40, a part of the scrubber water W is supplied to the centrifugal separator 10 through the second pipe 42.
  • the untreated scrubber water W is introduced into the separation chamber 15 through the inflow pipe 11 and the guide tube 18 of the centrifuge 10.
  • the untreated scrubber water W flowing into the separation chamber 15 is subjected to centrifugal force, and the particulate matter is separated. It accumulates as a solid component S in the concave portion of the maximum diameter portion (see FIG. 2).
  • the treated scrubber water W ′ from which the particulate matter has been separated gradually increases and flows toward the center of the separation chamber 15 and reaches the chamber 23.
  • the scrubber water W ′ after processing in the chamber 23 flows out from the outflow pipe 20 to the outside by the action of the centripetal pump 19.
  • the treated scrubber water W ′ from the outflow pipe 20 passes through the second pipe 42 and merges with the untreated scrubber water W from the exhaust gas scrubber 30 in the first pipe 41 and returns to the exhaust gas scrubber 30.
  • the treated scrubber water W ′ from the centrifuge 10 is sampled through the sampling pipe 70 of the second pipe 42 at a flow rate of 3 L / min, for example.
  • This sampling water passes through the air separator 71 and is degassed here.
  • the initial turbidity of the defoamed sampling water is measured by a turbidimeter 72.
  • the sampling water whose initial turbidity is measured is discharged to a predetermined tank (not shown). The water accumulated in this tank returns to the exhaust gas scrubber 30 via the first pipe 41.
  • the interface I between the solid component S in the separation chamber 15 and the treated scrubber water W ′ gradually proceeds toward the center of the separation chamber 15. During this time, a slight solid component S at the interface I floats as particulate matter and is discharged to the outside along with the flow of the scrubber water W ′ after the treatment.
  • the valve opening / closing mechanism 25 is driven by the open signal from the system controller 17 to open the valve, send the valve opening water to the main valve 14, and open the main valve 14.
  • the solid component S deposited by opening the discharge port of the separation chamber 15 is discharged together with the scrubber water W ′ after processing, and is recovered in the recovery tank 80.
  • the supply of the valve opening working water is stopped.
  • the valve is opened by the closing signal from the system controller 17 to send the closed working water, the main valve 14 is closed, the valve is closed, and the supply of the closed working water is stopped.
  • the emission standard value is set by adding the initial turbidity and the turbidity difference ⁇ NTU as described above. If the initial turbidity is large, a small turbidity difference ⁇ NTU is set, and if the initial turbidity is small, a large turbidity difference ⁇ NTU is set. That is, the solid component S in the waste discharged from the centrifuge 10 is set to a predetermined concentration (this value) by appropriately changing and setting the turbidity difference ⁇ NTU according to the initial turbidity of the scrubber water W ′ after treatment. In the embodiment, it can be stabilized to 7% by weight), thereby reducing the storage space for waste.
  • the untreated scrubber water W supplied from the exhaust gas scrubber 30 into the centrifuge 10 under the control of the system controller 17 is given a centrifugal force in the separation chamber 15.
  • the turbidity of the scrubber water W ′ after treatment is measured by a turbidimeter 72 while the solid component S in the scrubber water W is separated and the treated scrubber water W ′ returns from the separation chamber 15 to the exhaust gas scrubber 30.
  • the centrifugal separator 10 that operates the valve opening / closing mechanism 25 based on the measured value to intermittently discharge the solid component S from the separation chamber 15, and has different turbidity in advance using a turbidimeter 72.
  • the first turbidity immediately after the start of treatment of the scrubber water W before treatment is measured as the initial turbidity, and the continuous treatment after measuring this initial turbidity.
  • the solid component S in the waste discharged from the separation chamber 15 reaches a predetermined concentration
  • the second turbidity of the scrubber water W ′ after treatment is measured, while the system controller 17 has different turbidity.
  • the difference between the second turbidity and the initial turbidity of the scrubber water W ′ after treatment is obtained as ⁇ NTU, and the initial turbidity of each of the plurality of scrubber waters W having different turbidities is obtained.
  • the discharge trigger table is created based on the initial turbidity of the plurality of groups and ⁇ NTU corresponding to each initial turbidity, and the system controller 17 The solid component S in the separation chamber 15 based on the stored memory 17A, the initial turbidity of the discharge trigger table, and ⁇ NTU corresponding to this initial turbidity.
  • the solid component S in the waste discharged from the centrifuge 10 with a simple configuration can be stabilized at a predetermined concentration (7% by weight in this embodiment), thereby reducing the amount of waste discharged. In addition, the storage space for waste can be reduced.
  • the system controller 17 has a discharge trigger table, if the initial turbidity of the scrubber water W ′ after treatment is measured by the turbidimeter 72, an appropriate ⁇ NTU corresponding to this is selected from the discharge trigger table. Since the discharge reference value can be set, the solid component S in the waste can be stably controlled to a predetermined concentration. Moreover, the centrifuge 10 can be completed with a simple system configuration and is economical.
  • this invention is not restrict

Abstract

Provided is a centrifugal separator having a simple configuration, with which the concentration of solid components in waste excreted from a separation chamber of a centrifugal separator can be stabilized at a high concentration, the amount of waste excreted can be reduced, and storage space for the waste can be reduced. A separating-plate-type centrifugal separator is provided with a system controller 17 having a memory 17A for storing initial turbidities divided into multiple groups and an excretion trigger table created from multiple increments NTU corresponding to respective groups of the initial turbidities, and a central computing-and-processing device 17B which determines an excretion reference value for excreting solid components S in a separation chamber 15 on the basis of the initial turbidities of the excretion trigger table and the increments NTU corresponding to the initial turbidities.

Description

遠心分離機及びその運転方法Centrifuge and operating method thereof
　本発明は、排ガススクラバー用の遠心分離機及びその運転方法に関し、更に詳しくは、船舶用ディーゼルエンジン等の排ガスの除塵処理に用いられる排ガススクラバーに適用される遠心分離機及びその運転方法に関する。 The present invention relates to a centrifuge for an exhaust gas scrubber and an operation method thereof, and more particularly to a centrifuge applied to an exhaust gas scrubber used for dust removal treatment of exhaust gas such as a marine diesel engine and an operation method thereof.
　船舶用ディーゼルエンジンからの排ガスにも厳しい環境規制があり、排ガスに含まれるＳＯＸやＮＯＸの排出が厳しく制限されている。そこで、従来から排ガススクラバーを用いて排ガスの除塵を行っている。排ガススクラバーを循環する除塵用水（以下、「スクラバー水」と称す。）には未燃焼カーボン等の粒子状物質が含まれているため、例えば遠心分離を用いてスクラバー水から粒子状物質を分離、除去している。粒子状物質は遠心分離機の遠心力を受けて分離室内の最大径部に固形成分として堆積するため、固形成分は分離室内の最大径部に形成された排出口からスクラバー水と一緒に間欠的に外部へ排出される。固形成分を含むスクラバー水は、そのまま海洋に投棄することができないため、船舶内に廃棄物として保管される。 Exhaust gas from marine diesel engines also has strict environmental regulations, and the emission of SO X and NO X contained in the exhaust gas is severely restricted. Therefore, conventionally, exhaust gas is removed using an exhaust gas scrubber. Since the dust removal water circulating through the exhaust gas scrubber (hereinafter referred to as “scrubber water”) contains particulate matter such as unburned carbon, the particulate matter is separated from the scrubber water using, for example, centrifugation. It has been removed. Particulate matter accumulates as a solid component on the maximum diameter in the separation chamber under the centrifugal force of the centrifuge, so the solid component is intermittent with the scrubber water from the discharge port formed in the maximum diameter in the separation chamber. Discharged to the outside. Since scrubber water containing solid components cannot be dumped into the ocean as it is, it is stored as waste in the ship.
　ところが、船舶内では、荷物や旅客のためのスペース確保が優先され、このような廃棄物を保管するためのスペースを十分に確保する余裕がないため、従来からこのような廃棄物を極力少なくする方法が検討されている。例えば、特許文献１には遠心分離機から発生する廃棄物を極力少なくする技術が記載されている。この技術では、遠心分離機からの廃棄物の排出量を極力少なくするために、濁度計を用いて遠心分離機において除塵された処理後のスクラバー水の濁度を測定し、この測定値が所定の閾値を超えた時に遠心分離機の分離室から堆積した固形成分を廃棄物として排出することにより、遠心分離機で発生する廃棄物の削減を図っている。つまり、遠心分離機での処理後のスクラバー水の濁度を監視することで遠心分離機の分離室内に堆積される固形成分の濃度または量を監視している。また、特許文献１には廃棄物の量を最少とすることが重要であることも指摘されている。 However, in the ship, priority is given to securing space for luggage and passengers, and there is no room to secure sufficient space for storing such waste, so conventionally reducing such waste as much as possible. A method is being considered. For example, Patent Document 1 describes a technique for minimizing waste generated from a centrifuge. In this technology, in order to minimize the amount of waste discharged from the centrifuge, the turbidity of the scrubber water after the dust removed in the centrifuge is measured using a turbidimeter. By discharging solid components deposited from the separation chamber of the centrifuge as waste when a predetermined threshold is exceeded, waste generated in the centrifuge is reduced. That is, the concentration or amount of the solid component deposited in the separation chamber of the centrifuge is monitored by monitoring the turbidity of the scrubber water after processing in the centrifuge. Patent Document 1 also points out that it is important to minimize the amount of waste.
特表２０１３-５２７７８８号公報Special table 2013-527788
　しかしながら、船舶用ディーゼルエンジンの負荷状態によって排ガスに含まれる未燃焼カーボン等の粒子状物質の含有率は変動するためスクラバー水の濁度も変動する。つまり、遠心分離機の処理能力は一定であるため、遠心分離機へ流入するスクラバー水の固形成分濃度が高ければ遠心分離機の分離効率が高くなり、遠心分離機へ流入するスクラバー水の固形成分濃度が低ければ遠心分離機の分離効率が低下する。従って、遠心分離機による処理後のスクラバー水の濁度が変動し、この濁度は分離室内の固形成分濃度または量とは必ずしも対応しない。また、遠心分離機へ流入するスクラバー水の濁度の変動により、分離室内から固形成分を排出しなければならなくなるまでに要する時間が変動する。分離室内の固形成分の濃度が高い時には固形成分を早めに排出しなければ排出困難になり、逆に分離室内の固形成分の濃度が低い時には濃度が濃くなるまで待つ必要がある。 However, the turbidity of the scrubber water also changes because the content of the particulate matter such as unburned carbon contained in the exhaust gas changes depending on the load state of the marine diesel engine. In other words, since the processing capacity of the centrifuge is constant, the higher the solid component concentration of the scrubber water flowing into the centrifuge, the higher the separation efficiency of the centrifuge, and the solid component of the scrubber water flowing into the centrifuge If the concentration is low, the separation efficiency of the centrifuge decreases. Therefore, the turbidity of the scrubber water after treatment by the centrifuge varies, and this turbidity does not necessarily correspond to the solid component concentration or amount in the separation chamber. In addition, the time required for the solid component to be discharged from the separation chamber varies due to the turbidity of the scrubber water flowing into the centrifuge. When the concentration of the solid component in the separation chamber is high, it is difficult to discharge the solid component unless the solid component is discharged early. Conversely, when the concentration of the solid component in the separation chamber is low, it is necessary to wait until the concentration becomes high.
　遠心分離機で処理後のスクラバー水の濁度が所定の閾値を超えた時に堆積した固形成分を分離室から廃棄物として排出する特許文献１に記載の方法では、廃棄物中の固形成分濃度が安定しないため、廃棄物中の固形成分濃度が低い場合には廃棄物の量が増えて保管スペースが大きくなり、逆に廃棄物中の固形成分濃度が高い場合には固形成分を排出口から廃棄物として排出しにくいという問題があった。 In the method described in Patent Document 1 in which solid components accumulated when the turbidity of scrubber water after treatment with a centrifuge exceeds a predetermined threshold is discharged as waste from the separation chamber, the concentration of solid components in the waste is If the concentration of solid components in the waste is low, the amount of waste increases and storage space increases. Conversely, if the concentration of solid components in the waste is high, the solid components are discarded from the outlet. There was a problem that it was difficult to discharge as a product.
　本発明は、上記課題を解決するためになされたもので、簡単な構成で遠心分離機の分離室から排出する廃棄物中の固形成分濃度を高濃度に安定させ、廃棄物の排出量を削減することができると共に廃棄物としての保管スペースを削減することができる遠心分離機及びその運転方法を提供することを目的としている。 The present invention has been made to solve the above-mentioned problems, and with a simple configuration, the solid component concentration in the waste discharged from the separation chamber of the centrifuge is stabilized at a high concentration, and the amount of waste discharged is reduced. It is an object of the present invention to provide a centrifuge and an operation method thereof that can reduce the storage space as waste.
　本発明の遠心分離機は、システムコントローラの制御下で、排ガススクラバーから回転する分離室内に供給される固形成分を含むスクラバー水に遠心力を付与して上記スクラバー水から上記固形成分を分離処理し、処理後の上記スクラバー水の濁度を濁度計によって測定し、上記濁度計の測定値に基づいて弁を開放して上記分離室から上記固形成分を廃棄物として間欠的に排出する遠心分離機であって、上記濁度計を用いて、予め濁度の異なる複数のスクラバー水それぞれについて、上記スクラバー水の上記処理開始直後の第１の濁度を初期濁度としてそれぞれ測定すると共に上記初期濁度を測定した後の継続処理で上記分離室から排出される廃棄物中の上記固形成分が所定の濃度に達した時に上記分離室から排出される上記スクラバー水の第２の濁度をそれぞれ測定する一方、上記システムコントローラでは、上記測定値に基づいて、上記初期濁度の異なる複数のスクラバー水それぞれについて、上記第２の濁度と上記初期濁度との差をΔＮＴＵとして求めると共に、上記初期濁度の異なる複数のスクラバー水それぞれの初期濁度をそれぞれの大きさに即して複数のグループに分類し、上記複数のグループの初期濁度とそれぞれの初期濁度に対応する上記ΔＮＴＵに基づいて排出トリガーテーブルを作成し、また、上記システムコントローラは、上記排出トリガーテーブルが格納されるメモリと、上記濁度計によって測定された上記スクラバー水の初期濁度とこの初期濁度に対応する上記排出トリガーテーブル中の上記ΔＮＴＵとから上記固形成分を排出する時の濁度を排出基準値として求める中央演算処理装置と、を備えていることを特徴とするものである。 The centrifuge of the present invention separates the solid component from the scrubber water by applying centrifugal force to the scrubber water containing the solid component supplied into the separation chamber rotating from the exhaust gas scrubber under the control of the system controller. The centrifuge measures the turbidity of the scrubber water after treatment with a turbidimeter, and opens the valve based on the measured value of the turbidimeter to intermittently discharge the solid component as waste from the separation chamber. The separator is a turbidimeter, and for each of a plurality of scrubber waters having different turbidities in advance, the first turbidity immediately after the start of the treatment of the scrubber water is measured as an initial turbidity and The scrubber water discharged from the separation chamber when the solid component in the waste discharged from the separation chamber in a continuous process after measuring the initial turbidity reaches a predetermined concentration While the second turbidity is measured, the system controller determines the difference between the second turbidity and the initial turbidity for each of a plurality of scrubber waters having different initial turbidity based on the measured value. ΔTTU, and the initial turbidity of each of the plurality of scrubber waters having different initial turbidities is classified into a plurality of groups according to the respective sizes, and the initial turbidity of each of the plurality of groups and the respective initial turbidity are classified. A discharge trigger table based on the ΔNTU corresponding to the degree; and the system controller includes a memory in which the discharge trigger table is stored, an initial turbidity of the scrubber water measured by the turbidimeter. The turbidity when discharging the solid component from the ΔNTU in the discharge trigger table corresponding to this initial turbidity is the discharge standard. It comprises a central processing unit, a seeking as is characterized in.
　また、上記排出基準値は、上記初期濁度と上記ΔＮＴＵとの加算値であることを特徴とするものである。 Further, the emission standard value is an addition value of the initial turbidity and the ΔNTU.
　また、上記分離室から排出されるスクラバー水の濁度が上記排出基準値に達した時に上記弁を開放して上記分離室内の固形成分を排出することを特徴とするものである。 Further, when the turbidity of the scrubber water discharged from the separation chamber reaches the discharge standard value, the valve is opened to discharge solid components in the separation chamber.
　また、本発明の遠心分離機の運転方法は、システムコントローラの制御下で、排ガススクラバーから回転する分離室内に供給される固形成分を含むスクラバー水に遠心力を付与して上記スクラバー水から上記固形成分を分離処理し、処理後の上記スクラバー水の濁度を濁度計によって測定し、上記濁度計の測定値に基づいて弁を開放して上記分離室から上記固形成分を廃棄物として間欠的に排出する遠心分離機を運転する方法であって、上記遠心分離機を運転する方法は、上記遠心分離機の運転準備工程と、上記遠心分離機の運転実施工程と、を備え、上記運転準備工程は、予め濁度の異なる複数のスクラバー水それぞれについて、上記濁度の異なる複数のスクラバー水の上記処理開始直後の第１の濁度を初期濁度としてそれぞれ測定する工程と、上記初期濁度を測定した後の継続処理で上記分離室から排出される廃棄物中の上記固形成分が所定の濃度に達した時に上記分離室から排出される上記初期濁度の異なる複数のスクラバー水の第２の濁度をそれぞれ測定する工程と、上記初期濁度の異なる複数のスクラバー水それぞれについて上記第２の濁度と上記初期濁度との差をΔＮＴＵとして求める工程と、上記初期濁度の異なる複数のスクラバー水それぞれの初期濁度をそれぞれの大きさに即して複数のグループに分類し、上記複数のグループの初期濁度とそれぞれの初期濁度に対応する上記ΔＮＴＵに基づいて排出トリガーテーブルを作成する工程と、上記排出トリガーテーブルを上記システムコントローラに設定する工程と、を有し、上記運転実施工程は、上記スクラバー水の分離処理直後の初期濁度を測定する工程と、上記スクラバー水の初期濁度とこの初期濁度に対応する上記ΔＮＴＵに基づいて上記固形成分を排出するための排出基準値を求める工程と、上記初期濁度測定に続いてその後の上記スクラバー水の濁度を測定する工程と、上記濁度が上記排出基準値に達した時に上記弁を開放する工程と、を有することを特徴とするものである。 Further, the operation method of the centrifuge of the present invention is such that, under the control of the system controller, a centrifugal force is applied to the scrubber water containing the solid component supplied from the exhaust gas scrubber to the solid material from the scrubber water. The components are separated, the turbidity of the scrubber water after treatment is measured with a turbidimeter, the valve is opened based on the measured value of the turbidimeter, and the solid component is intermittently discharged as waste from the separation chamber. A method of operating a centrifugal separator for discharging, wherein the method of operating the centrifugal separator comprises an operation preparation step of the centrifugal separator and an operation execution step of the centrifugal separator, and the operation The preparation step measures the first turbidity immediately after the start of the treatment as the initial turbidity for each of the plurality of scrubber waters having different turbidities in advance. And the initial turbidity discharged from the separation chamber when the solid component in the waste discharged from the separation chamber reaches a predetermined concentration in the continuous process after measuring the initial turbidity. A step of measuring the second turbidity of each of the plurality of scrubber waters, a step of obtaining a difference between the second turbidity and the initial turbidity as ΔNTU for each of the plurality of scrubber waters having different initial turbidities, The initial turbidity of each of the plurality of scrubber waters having different initial turbidities is classified into a plurality of groups according to the respective sizes, and the ΔNTU corresponding to the initial turbidity of each of the plurality of groups and each initial turbidity. And a step of setting the discharge trigger table in the system controller, and the operation execution step includes the scrubber water. A step of measuring initial turbidity immediately after the separation treatment, a step of obtaining an emission reference value for discharging the solid component based on the initial turbidity of the scrubber water and the ΔNTU corresponding to the initial turbidity, and A step of measuring the turbidity of the scrubber water after the initial turbidity measurement, and a step of opening the valve when the turbidity reaches the discharge standard value. is there.
　また、上記運転準備工程では、上記初期濁度が小さい時には上記ΔＮＴＵを大きく設定し、上記初期濁度が大きい時には上記ΔＮＴＵを小さく設定することを特徴とするものである。 Further, in the operation preparation step, when the initial turbidity is small, the ΔNTU is set large, and when the initial turbidity is large, the ΔNTU is set small.
　また、上記運転実施工程では、上記排出基準値として上記初期濁度とこの初期濁度に対応する上記ΔＮＴＵとの加算値を用いることを特徴とするものである。 Further, in the operation execution step, an addition value of the initial turbidity and the ΔNTU corresponding to the initial turbidity is used as the emission reference value.
　本発明によれば、簡単な構成で遠心分離機の分離室から排出する廃棄物中の固形成分濃度を高濃度に安定させ、廃棄物の排出量を削減することができると共に廃棄物としての保管スペースを削減することができる遠心分離機及びその運転方法を提供することができる。 According to the present invention, the solid component concentration in the waste discharged from the separation chamber of the centrifuge can be stabilized at a high concentration with a simple configuration, and the amount of waste discharged can be reduced and stored as waste. A centrifuge capable of reducing space and an operation method thereof can be provided.
図１は、スクラバーに適用された本発明の遠心分離機の一実施形態を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of a centrifuge of the present invention applied to a scrubber. 図２は、図１に示す遠心分離機の要部を示す模式図である。FIG. 2 is a schematic diagram showing a main part of the centrifuge shown in FIG.
　以下、図１及び図２に示す実施形態に基づいて本発明を説明する。本実施形態の遠心分離機１０は、例えば図１に示すように、排ガス排ガススクラバー３０と第１の循環配管４０を介して接続されおり、排ガススクラバー３０での除塵後のスクラバー水が処理前のスクラバー水Ｗとして第１の循環配管４０を循環する間に遠心分離機１０で粒子状物質が分離処理されて処理後のスクラバー水Ｗ'が第１の循環配管４０を介して排ガススクラバー３０へ戻される。第１の循環配管４０は、図１に示すように、第１配管４１と、第１配管４１に接続された第２配管４２と、を有している。本実施形態では、遠心分離機１０として分離板型遠心分離機が用いられている。また、排ガススクラバー３０は、ディーゼルエンジン５０と第２の循環配管６０を介して接続されている。排ガススクラバー３０はディーゼルエンジン５０からの排ガスを除塵し、ディーゼルエンジン５０は除塵後の清浄な排ガスを再度吸気することで燃焼ガス中のＮＯＸ等を減少させる。 Hereinafter, the present invention will be described based on the embodiment shown in FIGS. 1 and 2. For example, as shown in FIG. 1, the centrifugal separator 10 of the present embodiment is connected to an exhaust gas exhaust gas scrubber 30 via a first circulation pipe 40, and scrubber water after dust removal in the exhaust gas scrubber 30 is not treated. While circulating through the first circulation pipe 40 as the scrubber water W, the particulate matter is separated by the centrifugal separator 10, and the treated scrubber water W ′ is returned to the exhaust gas scrubber 30 through the first circulation pipe 40. It is. As shown in FIG. 1, the first circulation pipe 40 includes a first pipe 41 and a second pipe 42 connected to the first pipe 41. In the present embodiment, a separation plate type centrifugal separator is used as the centrifugal separator 10. Further, the exhaust gas scrubber 30 is connected to the diesel engine 50 via the second circulation pipe 60. Exhaust gas scrubber 30 is dedusted exhaust gas from the diesel engine 50, diesel engine 50 reduces the NO X, etc. of the combustion gas by air clean exhaust gas after dust removal again.
　遠心分離機１０は、図１に示すように、第２配管４２に設けられ、第１配管４１から供給される処理前のスクラバー水Ｗに遠心力を付与してスクラバー水Ｗに含まれる排ガス由来の粒子状物質を固形成分として分離処理し、処理後の清浄なスクラバー水Ｗ'を排ガススクラバー３０へ戻す。排ガススクラバー３０は、スクラバー水Ｗを介してディーゼルエンジン５０からの排ガスから粒子状物質を除塵する。尚、図１にはスクラバー水Ｗまたは排ガスを循環させるポンプ等の給送手段は図面上では省略されている。また、以下では、排ガススクラバー３０から遠心分離機１０へ供給されるスクラバー水Ｗを処理前のスクラバー水Ｗと称し、遠心分離機１０による処理後の清浄なスクラバー水Ｗ'を処理後のスクラバー水Ｗ'と称する。 As shown in FIG. 1, the centrifugal separator 10 is provided in the second pipe 42, and applies centrifugal force to the untreated scrubber water W supplied from the first pipe 41 to derive from the exhaust gas contained in the scrubber water W. The particulate matter is separated as a solid component, and the clean scrubber water W ′ after the treatment is returned to the exhaust gas scrubber 30. The exhaust gas scrubber 30 removes particulate matter from the exhaust gas from the diesel engine 50 via the scrubber water W. In FIG. 1, a feeding means such as a pump for circulating the scrubber water W or the exhaust gas is omitted in the drawing. Hereinafter, the scrubber water W supplied from the exhaust gas scrubber 30 to the centrifuge 10 is referred to as a scrubber water W before the treatment, and the clean scrubber water W ′ after the treatment by the centrifuge 10 is the scrubber water after the treatment. Called W ′.
　排ガススクラバーとしては、従来公知の種々のタイプのスクラバーを使用することができる。例えば図１に示す排ガススクラバー３０では第１の配管４１を循環する処理前のスクラバー水Ｗと遠心分離機１０からの処理後のスクラバー水Ｗ'とが第１配管４１において合流し、第１配管４１に接続されたスプレーノズル３１を介して排ガススクラバー３０内へ噴霧されて内部の排ガス中に浮遊する粒子状物質を捕獲して除塵する。排ガススクラバー３０としては、充填物上にスクラバー水Ｗを噴射し、充填物の表面の液膜で粒子状物質を除塵するスクラバー等を用いることができる。 As the exhaust gas scrubber, various types of conventionally known scrubbers can be used. For example, in the exhaust gas scrubber 30 shown in FIG. 1, the untreated scrubber water W circulating through the first pipe 41 and the treated scrubber water W ′ from the centrifuge 10 merge in the first pipe 41. The particulate matter sprayed into the exhaust gas scrubber 30 through the spray nozzle 31 connected to 41 and suspended in the internal exhaust gas is captured and removed. As the exhaust gas scrubber 30, a scrubber or the like that sprays scrubber water W onto the filler and removes particulate matter with a liquid film on the surface of the filler can be used.
　次いで、本実施形態の遠心分離機１０について図１、図２を参照しながら更に説明する。遠心分離機１０の第１の循環配管４０の第２配管４２には処理後のスクラバー水Ｗ'をサンプリングするサンプリング用配管７０が接続されている。このサンプリング用配管７０には処理後のスクラバー水Ｗ'の脱泡処理を行うエアセパレータ７１が設けられている。更に、サンプリング用配管７０のエアセパレータ７１の下流側には濁度計７２が設けられている。従って、エアセパレータ７１が処理後のスクラバー水Ｗ'を脱泡した後、濁度計７２が処理後のスクラバー水Ｗ'の濁度を高精度に測定することができる。濁度計７２は濁度をアナログ信号として検出し、このアナログ信号がシステムコントローラ１７においてデジタル信号に変換される。この濁度がある値（例えば後述の「排出基準値」）に達した場合にシステムコントローラ１７から弁開閉機構へ信号を送信し、遠心分離機１０の排出口を開き、固形成分をスクラバー水と一緒に廃棄物として排出し、回収タンク８０内へ溜める。回収タンク８０内の廃棄物が所定量に達したら、廃棄物がポンプ８１を介して他の保管場所へ搬送される。 Next, the centrifuge 10 of the present embodiment will be further described with reference to FIGS. A sampling pipe 70 for sampling the processed scrubber water W ′ is connected to the second pipe 42 of the first circulation pipe 40 of the centrifuge 10. The sampling pipe 70 is provided with an air separator 71 for performing defoaming processing of the scrubber water W ′ after processing. Further, a turbidimeter 72 is provided on the downstream side of the air separator 71 in the sampling pipe 70. Therefore, after the air separator 71 degass the treated scrubber water W ′, the turbidimeter 72 can measure the turbidity of the treated scrubber water W ′ with high accuracy. The turbidimeter 72 detects the turbidity as an analog signal, and this analog signal is converted into a digital signal by the system controller 17. When the turbidity reaches a certain value (for example, “discharge standard value” described later), a signal is transmitted from the system controller 17 to the valve opening / closing mechanism, the discharge port of the centrifugal separator 10 is opened, and the solid component is converted into scrubber water. The waste is discharged together and stored in the collection tank 80. When the waste in the collection tank 80 reaches a predetermined amount, the waste is transferred to another storage location via the pump 81.
　而して、遠心分離機１０は、例えば図２に示すように、排ガススクラバー３０からの処理前のスクラバー水Ｗが流入する流入管１１と、上端が開口した回転胴（図示せず）と、回転胴の上端開口に嵌着されて回転体を形成する回転体蓋１２と、回転体蓋１２の内面に対して隙間を介して配置された仕切板１３と、回転胴内に挿入された状態で矢印で示すように上下に移動して回転胴の側部に形成された排出口（図示せず）を開閉する主弁１４と、主弁１４と仕切板１３間に形成された分離室１５と、分離室１５内に上下に所定間隔を空けて積層、配置された複数の分離板１６と、を備え、システムコントローラ１７の制御下で、流入管１１から案内筒１８を介して分離室１５内に処理前のスクラバー水Ｗが供給される。粒子状物質はスクラバー水より比重が大きいため、分離室１５内で遠心力が付与されると分離板１６によってスクラバー水から粒子状物質が固形成分Ｓとして遠心分離される。分離室１５内の処理後のスクラバー水Ｗ'は、求心ポンプ１９、流出管２０を介して外部へ排出される。図２において、処理後のスクラバー水Ｗ'は薄く塗りつぶされた領域を示し、固形成分Ｓは濃く塗りつぶされた領域を示す。 Thus, as shown in FIG. 2, for example, the centrifugal separator 10 includes an inflow pipe 11 into which the untreated scrubber water W flows from the exhaust gas scrubber 30, a rotating cylinder (not shown) whose upper end is open, A rotating body lid 12 that is fitted into the upper end opening of the rotating body to form a rotating body, a partition plate 13 that is disposed with a gap with respect to the inner surface of the rotating body cover 12, and a state that is inserted into the rotating body The main valve 14 moves up and down as shown by the arrows to open and close a discharge port (not shown) formed on the side of the rotary drum, and the separation chamber 15 formed between the main valve 14 and the partition plate 13. And a plurality of separation plates 16 stacked and arranged at predetermined intervals in the upper and lower directions in the separation chamber 15. Under the control of the system controller 17, the separation chamber 15 is introduced from the inflow pipe 11 through the guide tube 18. The scrubber water W before a process is supplied in the inside. Since the particulate matter has a specific gravity greater than that of the scrubber water, when the centrifugal force is applied in the separation chamber 15, the particulate matter is centrifuged as the solid component S from the scrubber water by the separation plate 16. The treated scrubber water W ′ in the separation chamber 15 is discharged to the outside through the centripetal pump 19 and the outflow pipe 20. In FIG. 2, the scrubber water W ′ after processing indicates a thinly painted area, and the solid component S indicates a darkly painted area.
　また、分離室１５において粒子状物質が固形成分Ｓとして処理後のスクラバー水Ｗ'から遠心分離されると、固形成分Ｓが分離室１５の最大径部に形成された排出口(図示せず)を含む凹部に堆積する。処理後のスクラバー水Ｗ'と固形成分Ｓとの間には界面Ｉが形成される。そして、この界面Ｉの固形成分Ｓの極一部が処理後のスクラバー水Ｗ'の流れに乗って矢印方向へ移動し、処理後のスクラバー水Ｗ'に混入して濁った状態で流出管２０から外部へ排出される。処理後のスクラバー水Ｗ'の濁度は、濁度計で測定することができる。 Further, when the particulate matter is centrifuged as the solid component S from the scrubber water W ′ after being processed in the separation chamber 15, the solid component S is a discharge port (not shown) formed in the maximum diameter portion of the separation chamber 15. Deposited in a recess containing An interface I is formed between the scrubber water W ′ after treatment and the solid component S. Then, a very small part of the solid component S at the interface I moves along the flow of the scrubber water W ′ after the treatment and moves in the direction of the arrow, and is mixed with the scrubber water W ′ after the treatment and becomes turbid. Is discharged to the outside. The turbidity of the scrubber water W ′ after the treatment can be measured with a turbidimeter.
　求心ポンプ１９は、仕切板１３の上端に形成されたチャンバー２３内に臨み、分離室１５からオーバーフローしてチャンバー２３内に溜まる処理後のスクラバー水Ｗ'を排出する。時間の経過と共に固形成分Ｓと処理後のスクラバー水Ｗ'の界面Ｉが分離室１５の中心に向かって進むため、固形成分Ｓを分離室１５から排出させる必要がある。回転胴の側部に形成された排出口を開くことにより固形成分Ｓが分離室１５内の処理後のスクラバー水Ｗ'の一部と共に排出されて廃棄物となる。廃棄物中の固形成分Ｓの濃度が低いと廃棄物量が増加し、逆に固形成分Ｓの濃度が高いと排出口からの排出が困難になる。従って、遠心分離機１０を運転する場合には、固形成分Ｓを所定の濃度で安定させて固形成分Ｓを確実に排出することが重要である。そこで、本実施形態では、処理前のスクラバー水Ｗの濁度の変動に応じて分離室１５の排出口を開くトリガー（以下、「排出トリガー」と称す。）を予め適宜設定しておくことにより、廃棄物中の固形成分濃度を安定させて最小限の廃棄物量を確実に排出することができる。 The centripetal pump 19 faces into the chamber 23 formed at the upper end of the partition plate 13 and discharges the processed scrubber water W ′ that overflows from the separation chamber 15 and accumulates in the chamber 23. Since the interface I between the solid component S and the scrubber water W ′ after processing proceeds toward the center of the separation chamber 15 with the passage of time, the solid component S needs to be discharged from the separation chamber 15. By opening a discharge port formed in the side portion of the rotating drum, the solid component S is discharged together with a part of the scrubber water W ′ after processing in the separation chamber 15 to become waste. If the concentration of the solid component S in the waste is low, the amount of waste increases. Conversely, if the concentration of the solid component S is high, it is difficult to discharge from the outlet. Therefore, when the centrifuge 10 is operated, it is important to stabilize the solid component S at a predetermined concentration and reliably discharge the solid component S. Therefore, in the present embodiment, a trigger (hereinafter referred to as “discharge trigger”) that opens the discharge port of the separation chamber 15 in accordance with the change in turbidity of the scrubber water W before treatment is appropriately set in advance. The solid component concentration in the waste can be stabilized and the minimum amount of waste can be discharged reliably.
　本実施形態の遠心分離機の運転方法は、運転のために必要な初期濁度等の種々のデータを準備する運転準備工程と、運転準備工程で得られたデータを用いて運転を実施する運転実施工程を備えている。運転準備工程では排出トリガーを以下の手順で設定する。排出トリガーを設定するためには、それぞれ濁度の異なるスクラバー水を処理前のスクラバー水Ｗとして複数準備する。予め準備されているある濁度を有する処理前のスクラバー水Ｗを遠心分離機１０によって固形成分を分離処理し、処理開始直後の処理後のスクラバー水Ｗ'の濁度を測定する。本発明ではこの処理開始直後の濁度が初期濁度として定義される。遠心分離機１０の運転中、濁度計７２を用いて、ある濁度の処理後のスクラバー水Ｗ'の初期濁度が測定される。また、これに続く継続処理時の適当なタイミングで処理後のスクラバー水Ｗ'の濁度が適宜測定され、その直後に分離室１５から固形成分Ｓが処理後のスクラバー水Ｗ'と一緒に廃棄物として排出されると共にこの廃棄物中の固形成分濃度が測定される。処理後のスクラバー水Ｗ'の濁度を測定するタイミングが適宜変られ、これに伴ってあるタイミングでの廃棄物の固形成分濃度測定値（分析値）が所定の濃度（例えば、７重量％）に達し、その時の処理後のスクラバー水Ｗ'の濁度が濁度計７２によって測定され、記録される。廃棄物の固形成分濃度が所定の濃度７重量％に達した時の処理後のスクラバー水Ｗ'の濁度と初期濁度との差分が濁度差（ΔＮＴＵ）として定義される。 The operation method of the centrifuge of the present embodiment includes an operation preparation step for preparing various data such as initial turbidity necessary for the operation, and an operation for performing the operation using the data obtained in the operation preparation step. Implementation steps are provided. In the operation preparation process, the discharge trigger is set according to the following procedure. In order to set the discharge trigger, a plurality of scrubber waters having different turbidities are prepared as the scrubber water W before treatment. The pre-treatment scrubber water W having a certain turbidity prepared in advance is separated from the solid component by the centrifugal separator 10, and the turbidity of the treated scrubber water W ′ immediately after the start of the treatment is measured. In the present invention, the turbidity immediately after the start of the treatment is defined as the initial turbidity. During operation of the centrifuge 10, the initial turbidity of the scrubber water W ′ after a certain turbidity treatment is measured using a turbidimeter 72. Further, the turbidity of the scrubber water W ′ after the treatment is appropriately measured at an appropriate timing during the subsequent treatment, and immediately after that, the solid component S is discarded from the separation chamber 15 together with the scrubber water W ′ after the treatment. It is discharged as a product and the concentration of solid components in this waste is measured. The timing for measuring the turbidity of the scrubber water W ′ after treatment is changed as appropriate, and the solid component concentration measurement value (analysis value) of the waste at a certain timing is a predetermined concentration (for example, 7% by weight). The turbidity of the scrubber water W ′ after treatment at that time is measured by the turbidimeter 72 and recorded. The difference between the turbidity of the scrubber water W ′ after the treatment and the initial turbidity when the solid component concentration of the waste reaches a predetermined concentration of 7% by weight is defined as a turbidity difference (ΔNTU).
　初期濁度は、遠心分離機１０に流入する処理前のスクラバー水Ｗによって変わるため、予め濁度の異なる複数の処理前のスクラバー水Ｗについて、それぞれの初期濃度とその後の廃棄物の固形成分濃度が所定の濃度７重量％に達した時の処理後のスクラバー水Ｗ'の濁度との差からΔＮＴＵが算出され、記録される。上述の所定の廃棄物中の固形成分濃度は運転条件によって適宜変更することができる。このように複数の異なる濁度を有する処理前のスクラバー水Ｗとそれぞれの処理後のスクラバー水Ｗ'の初期濁度とこれに対応するΔＮＴＵを求めて例えば表１に示す排出トリガーテーブルが作成される。 Since the initial turbidity varies depending on the pre-treatment scrubber water W flowing into the centrifuge 10, the initial concentration and the solid component concentration of each of the subsequent wastes for a plurality of pre-treatment scrubber waters W having different turbidities in advance. ΔNTU is calculated and recorded from the difference from the turbidity of the scrubber water W ′ after the treatment when reaches a predetermined concentration of 7% by weight. The solid component concentration in the above-mentioned predetermined waste can be appropriately changed depending on the operating conditions. In this way, the initial turbidity of the scrubber water W before processing having a plurality of different turbidities and the scrubber water W ′ after each processing and ΔNTU corresponding to the initial turbidity are obtained, and for example, the discharge trigger table shown in Table 1 is created The
　表１に示すように、予め異なる複数の処理前のスクラバー水Ｗそれぞれの初期濁度が例えば０～３０００の範囲で測定され、この範囲内で初期濁度が例えば２００毎に分割されて、初期濁度の範囲が０～２００、２０１～４００、・・・、２８０１～３０００のように複数のグループに分類される。初期濁度の全範囲とそのグループ数は、想定される処理前のスクラバー水Ｗの濁度等の運転環境及び濁度計７２の仕様（測定範囲、誤差）などに基づいて適宜設定される。本実施形態では、表１に示すように、表の上段に初期濁度を２００毎に分割した複数のグループが記入され、表の下段に各初期濁度のグループに対するΔＮＴＵが記入される。本実施形態では、このように作成された表１が排出トリガーテーブルとして定義される。排出トリガーテーブルは、運転準備工程において、濁度などの測定データに基づいて予め求められ、システムコントローラ１７に設定される。 As shown in Table 1, the initial turbidity of each of a plurality of different pre-treatment scrubber waters W is measured in a range of 0 to 3000, for example, and the initial turbidity is divided into, for example, every 200 within this range. The turbidity ranges are classified into a plurality of groups such as 0 to 200, 201 to 400, ..., 2801 to 3000. The entire range of the initial turbidity and the number of groups thereof are appropriately set based on the assumed operating environment such as the turbidity of the scrubber water W before treatment, the specifications (measurement range, error) of the turbidimeter 72, and the like. In the present embodiment, as shown in Table 1, a plurality of groups obtained by dividing the initial turbidity every 200 are entered in the upper part of the table, and ΔNTU for each initial turbidity group is entered in the lower part of the table. In the present embodiment, Table 1 created in this way is defined as a discharge trigger table. The discharge trigger table is obtained in advance based on measurement data such as turbidity in the operation preparation step, and is set in the system controller 17.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１のようにして作成された排出トリガーテーブルは予めシステムコントローラ１７のメモリ１７Ａに格納され、本実施形態の遠心分離機１０の運転方法の運転実施工程において用いられる。オペレータは、表１に示す排出トリガーテーブルを参照し、例えば初期濁度が小さい場合には分離室１５内の凹部に蓄積される固形成分Ｓが少ないと判断して大きなΔＮＴＵをシステムコントローラ１７上で割り当て、逆に初期濁度が大きい場合には分離室１５内の凹部の固形成分Ｓが多いと判断して小さなΔＮＴＵをシステムコントローラ１７上で割り当てる。 The discharge trigger table created as shown in Table 1 is stored in advance in the memory 17A of the system controller 17 and used in the operation execution step of the operation method of the centrifuge 10 of the present embodiment. The operator refers to the discharge trigger table shown in Table 1 and, for example, when the initial turbidity is small, the operator determines that the solid component S accumulated in the recess in the separation chamber 15 is small, and sets a large ΔNTU on the system controller 17. On the contrary, when the initial turbidity is large, it is determined that the solid component S in the recess in the separation chamber 15 is large, and a small ΔNTU is allocated on the system controller 17.
　遠心分離機を運転方法を実施する場合に、オペレータは、遠心分離機１０の運転開始直後または遠心分離機１０からの固形成分Ｓの排出完了直後に処理後のスクラバー水Ｗ'の初期濁度を測定した後、この初期濁度に対応する濁度差ΔＮＴＵをシステムコントローラ１７のメモリ１７Ａに格納された排出トリガーテーブルから選択し、初期濁度と濁度差ΔＮＴＵを用いて、より具体的には初期濁度にΔＮＴＵをシステムコントローラ１７の中央演算処理装置１７Ｂを介して加算して固形成分Ｓの排出基準値（＝初期濁度＋濁度差ΔＮＴＵ）を算出し、この排出基準値をシステムコントローラ１７に設定する。遠心分離機１０の運転中、システムコントローラ１７が排出基準値と濁度計７２の測定値との比較結果に基づいて弁開閉機構２５の開閉のタイミングを自動的に制御する。濁度計７２の測定値が排出基準値に達すれば、システムコントローラ１７が開信号を弁開閉機構２５に出力する。弁開閉機構２５は、開信号を受けて所定のバルブ(図示せず)を開放して開弁作動水を供給して主弁１４を下方に移動させて分離室１５の排出口を開放し、堆積した固形成分Ｓを回収タンク８０に向けて排出する。その後、バルブを閉じて開弁作動水を停止する。次いで、閉信号に基づいてバルブ(図示せず)が作動して閉弁作動水を供給し主弁１４を閉じ、閉弁作動水を停止する。 When carrying out the operation method of the centrifuge, the operator sets the initial turbidity of the scrubber water W ′ after the treatment immediately after the start of the operation of the centrifuge 10 or immediately after the discharge of the solid component S from the centrifuge 10 is completed. After the measurement, the turbidity difference ΔNTU corresponding to this initial turbidity is selected from the discharge trigger table stored in the memory 17A of the system controller 17, and more specifically, using the initial turbidity and the turbidity difference ΔNTU, ΔNTU is added to the initial turbidity via the central processing unit 17B of the system controller 17 to calculate a solid component S emission reference value (= initial turbidity + turbidity difference ΔNTU), and this emission reference value is used as the system controller. Set to 17. During operation of the centrifugal separator 10, the system controller 17 automatically controls the opening / closing timing of the valve opening / closing mechanism 25 based on the comparison result between the discharge reference value and the measured value of the turbidimeter 72. When the measured value of the turbidimeter 72 reaches the discharge reference value, the system controller 17 outputs an open signal to the valve opening / closing mechanism 25. In response to the opening signal, the valve opening / closing mechanism 25 opens a predetermined valve (not shown), supplies valve opening operation water, moves the main valve 14 downward, and opens the discharge port of the separation chamber 15. The deposited solid component S is discharged toward the collection tank 80. Thereafter, the valve is closed and the valve opening water is stopped. Next, a valve (not shown) is operated based on the closing signal to supply the valve closing operation water, close the main valve 14 and stop the valve closing operation water.
　次に、本実施形態の遠心分離機１０の運転方法について説明する。 Next, an operation method of the centrifuge 10 of this embodiment will be described.
　まず、ディーゼルエンジン５０の排ガスが第２の循環配管６０の往路管６１を介して排ガススクラバー３０に流入すると、排ガススクラバー３０ではスクラバー水中に排ガス中の未燃焼の粒子状物質が混入して懸濁する。排ガススクラバー３０からの処理前のスクラバー水Ｗが第１の循環配管４０の第１配管４１を循環する間に、その一部が第２配管４２を介して遠心分離装置１０へ供給される。遠心分離機１０では処理前のスクラバー水Ｗが遠心分離機１０の流入管１１及び案内筒１８を介して分離室１５内に導入される。この時、遠心分離機１０の回転胴が高速で回転しているため、分離室１５内に流入する処理前のスクラバー水Ｗは遠心力を受け、粒子状物質が分離され、分離室１５内の最大径部の凹部に固形成分Ｓとして堆積する（図２参照）。粒子状物質が分離された処理後のスクラバー水Ｗ'は徐々に増えて分離室１５の中心に向けて流れ、チャンバー２３に達する。チャンバー２３内の処理後のスクラバー水Ｗ'は求心ポンプ１９の働きで流出管２０から外部へ流出する。流出管２０からの処理後のスクラバー水Ｗ'は第２配管４２を通って第１配管４１において排ガススクラバー３０からの処理前のスクラバー水Ｗと合流して排ガススクラバー３０へ戻る。 First, when the exhaust gas of the diesel engine 50 flows into the exhaust gas scrubber 30 via the forward pipe 61 of the second circulation pipe 60, the unburned particulate matter in the exhaust gas is mixed and suspended in the scrubber water in the exhaust gas scrubber 30. To do. While the untreated scrubber water W from the exhaust gas scrubber 30 circulates through the first pipe 41 of the first circulation pipe 40, a part of the scrubber water W is supplied to the centrifugal separator 10 through the second pipe 42. In the centrifuge 10, the untreated scrubber water W is introduced into the separation chamber 15 through the inflow pipe 11 and the guide tube 18 of the centrifuge 10. At this time, since the rotary drum of the centrifuge 10 is rotating at high speed, the untreated scrubber water W flowing into the separation chamber 15 is subjected to centrifugal force, and the particulate matter is separated. It accumulates as a solid component S in the concave portion of the maximum diameter portion (see FIG. 2). The treated scrubber water W ′ from which the particulate matter has been separated gradually increases and flows toward the center of the separation chamber 15 and reaches the chamber 23. The scrubber water W ′ after processing in the chamber 23 flows out from the outflow pipe 20 to the outside by the action of the centripetal pump 19. The treated scrubber water W ′ from the outflow pipe 20 passes through the second pipe 42 and merges with the untreated scrubber water W from the exhaust gas scrubber 30 in the first pipe 41 and returns to the exhaust gas scrubber 30.
　遠心分離機１０からの処理後のスクラバー水Ｗ'は第２配管４２のサンプリング用配管７０を介して例えば３Ｌ／ｍｉｎの流量でサンプリングされる。このサンプリング水は、エアセパレータ７１を通り、ここで脱泡される。脱泡されたサンプリング水は濁度計７２によって初期濁度が測定される。初期濁度が測定されたサンプリング水は所定のタンク(図示せず)へ排出される。このタンクに溜まる水は第１配管４１を経由して排ガススクラバー３０へ戻る。 The treated scrubber water W ′ from the centrifuge 10 is sampled through the sampling pipe 70 of the second pipe 42 at a flow rate of 3 L / min, for example. This sampling water passes through the air separator 71 and is degassed here. The initial turbidity of the defoamed sampling water is measured by a turbidimeter 72. The sampling water whose initial turbidity is measured is discharged to a predetermined tank (not shown). The water accumulated in this tank returns to the exhaust gas scrubber 30 via the first pipe 41.
　処理前のスクラバー水Ｗの遠心分離が進むに連れて分離室１５内の固形成分Ｓと処理後のスクラバー水Ｗ'との界面Ｉが徐々に分離室１５の中心に向けて進む。この間も、界面Ｉの僅かな固形成分Ｓが粒子状物質として浮遊して処理後のスクラバー水Ｗ'の流れに随伴して外部へ排出される。 As the pre-treatment scrubber water W is further centrifuged, the interface I between the solid component S in the separation chamber 15 and the treated scrubber water W ′ gradually proceeds toward the center of the separation chamber 15. During this time, a slight solid component S at the interface I floats as particulate matter and is discharged to the outside along with the flow of the scrubber water W ′ after the treatment.
　やがて、固形成分Ｓの堆積量が増えるに連れて処理後のスクラバー水Ｗ'の濁度が上昇して排出基準値に達する。この時、システムコントローラ１７からの開信号により弁開閉機構２５が駆動してバルブを開いて開弁作動水を主弁１４へ送り、主弁１４を開放する。これにより分離室１５の排出口が開いて堆積した固形成分Ｓが処理後のスクラバー水Ｗ'を伴って排出され、回収タンク８０で回収される。その後開弁作動水の供給が停止される。次いで、システムコントローラ１７からの閉信号によりバルブが開き閉作動水を送って主弁１４を閉じ、バルブを閉じて閉弁作動水の供給を停止する。 Eventually, as the amount of solid component S deposited increases, the turbidity of the scrubber water W ′ after treatment increases and reaches the discharge standard value. At this time, the valve opening / closing mechanism 25 is driven by the open signal from the system controller 17 to open the valve, send the valve opening water to the main valve 14, and open the main valve 14. As a result, the solid component S deposited by opening the discharge port of the separation chamber 15 is discharged together with the scrubber water W ′ after processing, and is recovered in the recovery tank 80. Thereafter, the supply of the valve opening working water is stopped. Next, the valve is opened by the closing signal from the system controller 17 to send the closed working water, the main valve 14 is closed, the valve is closed, and the supply of the closed working water is stopped.
　排出基準値は上述のように初期濁度と濁度差ΔＮＴＵを加算して設定されている。初期濁度が大きければ小さな濁度差ΔＮＴＵが設定され、初期濁度が小さければ大きな濁度差ΔＮＴＵが設定される。即ち、処理後のスクラバー水Ｗ'の初期濁度に応じて濁度差ΔＮＴＵを適宜変えて設定することにより、遠心分離機１０から排出される廃棄物中の固形成分Ｓを所定の濃度（本実施形態では７重量％）に安定させることができ、これにより廃棄物の保管スペースを削減することができる。 The emission standard value is set by adding the initial turbidity and the turbidity difference ΔNTU as described above. If the initial turbidity is large, a small turbidity difference ΔNTU is set, and if the initial turbidity is small, a large turbidity difference ΔNTU is set. That is, the solid component S in the waste discharged from the centrifuge 10 is set to a predetermined concentration (this value) by appropriately changing and setting the turbidity difference ΔNTU according to the initial turbidity of the scrubber water W ′ after treatment. In the embodiment, it can be stabilized to 7% by weight), thereby reducing the storage space for waste.
　以上説明したように本実施形態によれば、システムコントローラ１７の制御下で排ガススクラバー３０から遠心分離機１０内に供給される処理前のスクラバー水Ｗは分離室１５内で遠心力を付与されてスクラバー水Ｗ中の固形成分Ｓが分離処理され、処理後のスクラバー水Ｗ'が分離室１５から排ガススクラバー３０へ戻る間に処理後のスクラバー水Ｗ'の濁度を濁度計７２によって測定し、その測定値に基づいて弁開閉機構２５を作動させて分離室１５内から固形成分Ｓを間欠的に排出する遠心分離機１０であって、濁度計７２を用いて、予め濁度の異なる複数の処理前のスクラバー水それぞれについて、処理前のスクラバー水Ｗの処理開始直後の第１の濁度を初期濁度としてそれぞれ測定すると共にこの初期濁度を測定した後の継続処理で分離室１５から排出される廃棄物中の固形成分Ｓが所定の濃度に達した時に処理後のスクラバー水Ｗ'の第２の濁度をそれぞれ測定する一方、システムコントローラ１７では、濁度の異なる複数のスクラバー水Ｗそれぞれについて、処理後のスクラバー水Ｗ'の第２の濁度と初期濁度との差をΔＮＴＵとして求めると共に、濁度の異なる複数のスクラバー水Ｗそれぞれの初期濁度をそれぞれの大きさの順に複数のグループに分類し、複数のグループの初期濁度とそれぞれの初期濁度に対応するΔＮＴＵに基づいて排出トリガーテーブルを作成し、また、システムコントローラ１７は、排出トリガーテーブルが格納されたメモリ１７Ａと、排出トリガーテーブルの初期濁度とこの初期濁度に対応するΔＮＴＵとに基づいて分離室１５内の固形成分Ｓを排出するための排出基準値を求める中央演算処理装置１７Ｂと、を備えているため、運転準備工程で排出トリガーテーブルを作成すると共に排出トリガーテーブルに基づく排出基準値を算出し、また、運転実施工程では遠心分離機１０からの処理後のスクラバー水Ｗ'の濁度を逐次測定し、この濁度が排出基準値に達した時点で分離室１５内に堆積した固形成分Ｓを排出するようにしたため、簡単な構成で遠心分離機１０から排出される廃棄物中の固形成分Ｓを所定の濃度（本実施形態では7重量％）に安定させることができ、これにより廃棄物の排出量を削減することができると共に廃棄物の保管スペースを削減することができる。 As described above, according to the present embodiment, the untreated scrubber water W supplied from the exhaust gas scrubber 30 into the centrifuge 10 under the control of the system controller 17 is given a centrifugal force in the separation chamber 15. The turbidity of the scrubber water W ′ after treatment is measured by a turbidimeter 72 while the solid component S in the scrubber water W is separated and the treated scrubber water W ′ returns from the separation chamber 15 to the exhaust gas scrubber 30. The centrifugal separator 10 that operates the valve opening / closing mechanism 25 based on the measured value to intermittently discharge the solid component S from the separation chamber 15, and has different turbidity in advance using a turbidimeter 72. For each of the plurality of scrubber waters before treatment, the first turbidity immediately after the start of treatment of the scrubber water W before treatment is measured as the initial turbidity, and the continuous treatment after measuring this initial turbidity. While the solid component S in the waste discharged from the separation chamber 15 reaches a predetermined concentration, the second turbidity of the scrubber water W ′ after treatment is measured, while the system controller 17 has different turbidity. For each of the plurality of scrubber waters W, the difference between the second turbidity and the initial turbidity of the scrubber water W ′ after treatment is obtained as ΔNTU, and the initial turbidity of each of the plurality of scrubber waters W having different turbidities is obtained. The discharge trigger table is created based on the initial turbidity of the plurality of groups and ΔNTU corresponding to each initial turbidity, and the system controller 17 The solid component S in the separation chamber 15 based on the stored memory 17A, the initial turbidity of the discharge trigger table, and ΔNTU corresponding to this initial turbidity. And a central processing unit 17B for obtaining a discharge reference value for discharging, so that a discharge trigger table is created in the operation preparation step, a discharge reference value based on the discharge trigger table is calculated, and an operation execution step Then, the turbidity of the scrubber water W ′ after the treatment from the centrifuge 10 is sequentially measured, and the solid component S accumulated in the separation chamber 15 is discharged when the turbidity reaches the discharge standard value. The solid component S in the waste discharged from the centrifuge 10 with a simple configuration can be stabilized at a predetermined concentration (7% by weight in this embodiment), thereby reducing the amount of waste discharged. In addition, the storage space for waste can be reduced.
　また、システムコントローラ１７が排出トリガーテーブルを有するため、濁度計７２で処理後のスクラバー水Ｗ'の初期濁度を測定すれば、これに対応する適正なΔＮＴＵを排出トリガーテーブルの中から選択して排出基準値を設定することができるため、廃棄物中の固形成分Ｓを所定の濃度に安定的に制御することができる。また、遠心分離機１０は、簡単なシステム構成で済ますことができ、経済的である。 Further, since the system controller 17 has a discharge trigger table, if the initial turbidity of the scrubber water W ′ after treatment is measured by the turbidimeter 72, an appropriate ΔNTU corresponding to this is selected from the discharge trigger table. Since the discharge reference value can be set, the solid component S in the waste can be stably controlled to a predetermined concentration. Moreover, the centrifuge 10 can be completed with a simple system configuration and is economical.
　尚、本発明は、上記実施形態に何ら制限されるものではなく、本願発明の要旨に反しない限り、必要に応じて適宜設計変更をすることができる。 In addition, this invention is not restrict | limited to the said embodiment at all, As long as it is not contrary to the summary of this invention, it can change a design suitably as needed.
　１０　　遠心分離機
　１１　　流入管
　１２　　回転体蓋
　１４　　主弁（弁）
　１５　　分離室
　１６　　分離板
　１７　　システムコントローラ
　１７Ａ　メモリ
　１７Ｂ　中央演算処理装置
　２５　　弁開閉機構
　７２　　濁度計 DESCRIPTION OF SYMBOLS 10 Centrifuge 11 Inflow pipe 12 Rotating body cover 14 Main valve (valve)
15 Separation chamber 16 Separation plate 17 System controller 17A Memory 17B Central processing unit 25 Valve opening / closing mechanism 72 Turbidimeter

Claims (6)

  1. 　システムコントローラの制御下で、排ガススクラバーから回転する分離室内に供給される固形成分を含むスクラバー水に遠心力を付与して上記スクラバー水から上記固形成分を分離処理し、処理後の上記スクラバー水の濁度を濁度計によって測定し、上記濁度計の測定値に基づいて弁を開放して上記分離室から上記固形成分を廃棄物として間欠的に排出する遠心分離機であって、
    　上記濁度計を用いて、予め濁度の異なる複数のスクラバー水それぞれについて、上記スクラバー水の上記処理開始直後の第１の濁度を初期濁度としてそれぞれ測定すると共に上記初期濁度を測定した後の継続処理で上記分離室から排出される廃棄物中の上記固形成分が所定の濃度に達した時に上記分離室から排出される上記スクラバー水の第２の濁度をそれぞれ測定する一方、
    　上記システムコントローラでは、上記測定値に基づいて、上記初期濁度の異なる複数のスクラバー水それぞれについて、上記第２の濁度と上記初期濁度との差をΔＮＴＵとして求めると共に、上記初期濁度の異なる複数のスクラバー水それぞれの初期濁度をそれぞれの大きさに即して複数のグループに分類し、上記複数のグループの初期濁度とそれぞれの初期濁度に対応する上記ΔＮＴＵに基づいて排出トリガーテーブルを作成し、また、
    　上記システムコントローラは、
    　上記排出トリガーテーブルが格納されるメモリと、
    　上記濁度計によって測定された上記スクラバー水の初期濁度とこの初期濁度に対応する上記排出トリガーテーブル中の上記ΔＮＴＵとから上記固形成分を排出する時の濁度を排出基準値として求める中央演算処理装置と、を備えている
    　ことを特徴とする遠心分離機。     Under the control of the system controller, centrifugal force is applied to the scrubber water containing the solid component supplied from the exhaust gas scrubber to separate the solid component from the scrubber water, and the scrubber water after the treatment is treated. A centrifuge that measures turbidity with a turbidimeter, opens the valve based on the measured value of the turbidimeter, and intermittently discharges the solid component as waste from the separation chamber,
    Using the turbidimeter, for each of a plurality of scrubber waters having different turbidities in advance, the first turbidity immediately after the start of the treatment of the scrubber water was measured as the initial turbidity, and the initial turbidity was measured. While measuring the second turbidity of the scrubber water discharged from the separation chamber when the solid component in the waste discharged from the separation chamber in a subsequent continuous treatment reaches a predetermined concentration,
    The system controller obtains the difference between the second turbidity and the initial turbidity as ΔNTU for each of a plurality of scrubber waters having different initial turbidity based on the measured value, and the initial turbidity The initial turbidity of each of a plurality of different scrubber waters is classified into a plurality of groups according to the respective sizes, and the discharge trigger is based on the initial turbidity of the plurality of groups and the ΔNTU corresponding to each initial turbidity Create a table,
    The system controller
    A memory for storing the discharge trigger table;
    The center for obtaining the turbidity when discharging the solid component from the initial turbidity of the scrubber water measured by the turbidimeter and the ΔNTU in the discharge trigger table corresponding to the initial turbidity as a discharge reference value A centrifuge comprising: an arithmetic processing unit.
  2. 　上記排出基準値は、上記初期濁度と上記ΔＮＴＵとの加算値であることを特徴とする請求項１に記載の遠心分離機。 The centrifuge according to claim 1, wherein the discharge standard value is an added value of the initial turbidity and the ΔNTU.
  3. 　上記分離室から排出されるスクラバー水の濁度が上記排出基準値に達した時に上記弁を開放して上記分離室内の固形成分を排出することを特徴とする請求項１または請求項２に記載の遠心分離機。 3. The solid component in the separation chamber is discharged by opening the valve when the turbidity of scrubber water discharged from the separation chamber reaches the discharge reference value. Centrifuge.
  4. 　システムコントローラの制御下で、排ガススクラバーから回転する分離室内に供給される固形成分を含むスクラバー水に遠心力を付与して上記スクラバー水から上記固形成分を分離処理し、処理後の上記スクラバー水の濁度を濁度計によって測定し、上記濁度計の測定値に基づいて弁を開放して上記分離室から上記固形成分を廃棄物として間欠的に排出する遠心分離機を運転する方法であって、
    　上記遠心分離機を運転する方法は、上記遠心分離機の運転準備工程と、上記遠心分離機の運転実施工程と、を備え、
    　上記運転準備工程は、
    　予め濁度の異なる複数のスクラバー水それぞれについて、上記濁度の異なる複数のスクラバー水の上記処理開始直後の第１の濁度を初期濁度としてそれぞれ測定する工程と、
    　上記初期濁度を測定した後の継続処理で上記分離室から排出される廃棄物中の上記固形成分が所定の濃度に達した時に上記分離室から排出される上記初期濁度の異なる複数のスクラバー水の第２の濁度をそれぞれ測定する工程と、
    　上記初期濁度の異なる複数のスクラバー水それぞれについて上記第２の濁度と上記初期濁度との差をΔＮＴＵとして求める工程と、
    　上記初期濁度の異なる複数のスクラバー水それぞれの初期濁度をそれぞれの大きさに即して複数のグループに分類し、上記複数のグループの初期濁度とそれぞれの初期濁度に対応する上記ΔＮＴＵに基づいて排出トリガーテーブルを作成する工程と、
    　上記排出トリガーテーブルを上記システムコントローラに設定する工程と、を有し、
    　上記運転実施工程は、
    　上記スクラバー水の分離処理直後の初期濁度を測定する工程と、
    　上記スクラバー水の初期濁度とこの初期濁度に対応する上記ΔＮＴＵに基づいて上記固形成分を排出するための排出基準値を求める工程と、
    　上記初期濁度測定に続いてその後の上記スクラバー水の濁度を測定する工程と、
    　上記濁度が上記排出基準値に達した時に上記弁を開放する工程と、を有する
    　ことを特徴とする遠心分離機の運転方法。     Under the control of the system controller, centrifugal force is applied to the scrubber water containing the solid component supplied from the exhaust gas scrubber to separate the solid component from the scrubber water, and the scrubber water after the treatment is treated. It is a method of operating a centrifuge that measures turbidity with a turbidimeter, opens a valve based on the measured value of the turbidimeter, and intermittently discharges the solid component as waste from the separation chamber. And
    The method of operating the centrifuge includes an operation preparation step of the centrifuge, and an operation execution step of the centrifuge,
    The operation preparation process is
    For each of a plurality of scrubber water having different turbidity in advance, measuring each of the first turbidity immediately after the start of the treatment as a plurality of scrubber water having different turbidity, respectively,
    A plurality of scrubbers having different initial turbidities discharged from the separation chamber when the solid components in the waste discharged from the separation chamber in a continuous process after measuring the initial turbidity reach a predetermined concentration Measuring each of the second turbidity of the water;
    Obtaining a difference between the second turbidity and the initial turbidity as ΔNTU for each of a plurality of scrubber waters having different initial turbidities;
    The initial turbidity of each of the plurality of scrubber waters having different initial turbidities is classified into a plurality of groups according to the respective sizes, and the ΔNTU corresponding to the initial turbidity of each of the plurality of groups and each initial turbidity. Creating a discharge trigger table based on
    Setting the discharge trigger table in the system controller,
    The above operation execution process is
    Measuring the initial turbidity immediately after the separation treatment of the scrubber water;
    Obtaining an emission reference value for discharging the solid component based on the initial turbidity of the scrubber water and the ΔNTU corresponding to the initial turbidity;
    Measuring the subsequent turbidity of the scrubber water following the initial turbidity measurement;
    And a step of opening the valve when the turbidity reaches the discharge reference value.
  5. 　上記運転準備工程では、上記初期濁度が小さい時には上記ΔＮＴＵを大きく設定し、上記初期濁度が大きい時には上記ΔＮＴＵを小さく設定することを特徴とする請求項４に記載の遠心分離機の運転方法。 5. The operation method of the centrifuge according to claim 4, wherein in the operation preparation step, the ΔNTU is set to be large when the initial turbidity is small, and the ΔNTU is set to be small when the initial turbidity is large. .
  6. 　上記運転実施工程では、上記排出基準値として上記初期濁度とこの初期濁度に対応する上記ΔＮＴＵとの加算値を用いることを特徴とする請求項４または請求項５に記載の遠心分離機の運転方法。 6. The centrifugal separator according to claim 4, wherein, in the operation execution step, an addition value of the initial turbidity and the ΔNTU corresponding to the initial turbidity is used as the discharge reference value. how to drive.
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