Apparatus and calculating method of pH

• US 10,456,733 B2
• Filed: 05/31/2017
• Issued: 10/29/2019
• Est. Priority Date: 03/16/2015
• Status: Active Grant

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Toyama, Hiroyuki, Takahashi, Kuniyuki
• Primary Examiner(s): Holecek, Cabrena
• Application Number:
  US15/609,046
• Publication Number:
  US 20170259203A1
• Time in Patent Office: 881 Days
• CPC Class Codes: B01D 2252/1035 Sea water
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 2259/4566 for use in transportation means
• CPC Class Codes: B01D 53/14 by absorption
• CPC Class Codes: B01D 53/1412 Controlling the absorption process
• CPC Class Codes: B01D 53/1456 Removing acid components
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/346 Controlling the process
• CPC Class Codes: B01D 53/50 Sulfur oxides B01D53/60 takes precedence
• CPC Class Codes: B01D 53/504 characterised by a specific device
• CPC Class Codes: B01D 53/92 of engine exhaust gases exhaust or silencing apparatus for internal combustion engines, machines or engines in general, having means for purifying, rendering innocuous or otherwise treating exhaust gases F01N3/00
• CPC Class Codes: B63H 21/32 Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels
• CPC Class Codes: B63H 21/38 Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like in outboard drives B63H20/001; lubricating or cooling machines or engines in general F01 - F04
• CPC Class Codes: B63J 3/04 from power plant other than propulsion power plant
• CPC Class Codes: F01N 3/04 using liquids
• CPC Class Codes: G01N 1/28 Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Qmounting specimens on microscopic slides G02B21/34; means for supporting the objects or the materials to be analysed in electron microscopes H01J37/20 ; laboratory gas handling apparatus B01L5/00
• CPC Class Codes: G01N 27/4167 pH electrodes therefor G01N27/302, G01N27/36
• CPC Class Codes: G01N 33/18 Water

Abstract

A human load of regularly measuring a pH of a position 4 meters from a discharge point during a term of a commissioning of a ship with a scrubber apparatus is reduced. Provided is an apparatus provided inside a ship having a scrubber, including a first pH measuring instrument which measures a pH value of washing water discharged from the scrubber to outboard, a second pH measuring instrument which measures a pH value of washing water supplied from outboard to the scrubber, and a calculating unit which calculates a pH value of water at a predetermined position outboard, based on a dilution ratio which shows a ratio by which the washing water discharged to outboard is diluted at the predetermined position outboard, the pH value measured by the first pH measuring instrument, and the pH value measured by the second pH measuring instrument.

Claims

1. An apparatus provided inside a ship having a scrubber, comprising:

a first pH measuring instrument which measures a pH value of washing water discharged from the scrubber to outboard;

a second pH measuring instrument which measures a pH value of washing water supplied from outboard to the scrubber; and

a calculating unit which calculates a pH value of water at a predetermined position outboard, based on a dilution ratio which shows a ratio by which the washing water discharged to outboard is diluted at the predetermined position outboard, the pH value measured by the first pH measuring instrument, and the pH value measured by the second pH measuring instrument.

2. The apparatus according to claim 1, wherein

the calculating unit calculates a value of the dilution ratio in advance, based on a first pH value measured by the first pH measuring instrument, a second pH value measured by the second pH measuring instrument, and a third pH value of the water at the predetermined position outboard,

the apparatus further comprises a recording unit which is connected to the calculating unit, and records the value of the dilution ratio, and

the calculating unit calculates the pH value of the water at the predetermined position, based on a pH value measured by the first pH measuring instrument after measuring the first pH value, a pH value measured by the second pH measuring instrument after measuring the second pH value, and the value of the dilution ratio recorded in the recording unit.

3. The apparatus according to claim 2, wherein

the calculating unit calculates the dilution ratio,

using pH1 which is the first pH value, pH2 which is the second pH value, and pH3 which is the third pH value, by

α

=(10<sup>−

pH1</sup>−

10<sup>−

pH2</sup>)/(10<sup>−

pH3</sup>−

10<sup>−

pH2</sup>).

4. The apparatus according to claim 3, wherein

the calculating unit calculates in advance

a value of a first dilution ratio calculated based on the pH1, the pH2, and the pH3 when a flow rate of washing water discharged from the scrubber to outboard is a first flow rate, and

a value of a second dilution ratio calculated based on the pH1, the pH2, and the pH3 when the flow rate of the washing water discharged from the scrubber to outboard is a second flow rate,

the recording unit records the value of the first dilution ratio and the value of the second dilution ratio,

the calculating unit calculates the pH value of the water at the predetermined position, using the value of the dilution ratio corresponding to the flow rate of the washing water discharged from the scrubber to outboard, and

the recording unit records and associates the flow rate of the washing water and the value of the dilution ratio.

5. The apparatus according to claim 4 further comprising

a controlling unit which controls a flow rate of washing water supplied to the scrubber, depending on the pH value of the water at the predetermined position calculated by the calculating unit.

6. The apparatus according to claim 5, wherein

if the flow rate of the washing water supplied to the scrubber is larger than or equal to a predetermined allowable amount, the controlling unit controls the flow rate of the washing water supplied to the scrubber to be smaller than or equal to the allowable amount, by decreasing an output of a motor which discharges exhaust gas to the scrubber.

7. The apparatus according to claim 6, wherein

provided that the ship is determined to be at anchor, the controlling unit decreases the output of the motor which discharges the exhaust gas to the scrubber.

8. A calculating method of pH of water at a predetermined position outside a ship having a scrubber, comprising:

measuring a pH value of washing water discharged from the scrubber to outboard;

measuring a pH value of washing water supplied from outboard to the scrubber; and

calculating the pH value of the water at the predetermined position outboard, based on a dilution ratio which shows a ratio by which the washing water discharged to outboard is diluted at the predetermined position outboard, the pH value measured in the measuring of the pH value of the washing water discharged from the scrubber to outboard, and the pH value measured in the measuring of the pH value of the washing water supplied from outboard to the scrubber.

9. The calculating method of pH according to claim 8 performed at a time of commissioning of the ship having the scrubber.

10. The calculating method of pH according to claim 8, further comprising:

before the calculating of the pH value of the water at the predetermined position outboard,

calculating a value of the dilution ratio in advance, based on a first pH value measured in the measuring of the pH value of the washing water discharged from the scrubber to outboard, a second pH value measured in the measuring of the pH value of the washing water discharged from the scrubber to outboard, and a third pH value of the water at the predetermined position outboard; and

recording the value of the dilution ratio, wherein

the calculating of the pH value of the water at the predetermined position outboard is calculating the pH value of the water at the predetermined position outboard, based on the pH value of the washing water discharged from the scrubber to outboard which is measured after measuring the first pH value, the pH value of the washing water supplied from outboard to the scrubber which is measured after measuring the second pH value, and the value of the dilution ratio recorded.

11. The calculating method of pH according to claim 10, wherein

the calculating of the value of the dilution ratio in advance has calculating:

a value of a first dilution ratio calculated based on the first pH value, the second pH value, and the third pH value when a flow rate of the washing water discharged from the scrubber to outboard is a first flow rate, and

a value of a second dilution ratio calculated based on the first pH value, the second pH value, and the third pH value when the flow rate of the washing water discharged from the scrubber to outboard is a second flow rate,

the recording of the value of the dilution ratio has recording the value of the first dilution ratio and the value of the second dilution ratio,

the calculating method of pH further comprises calculating the pH value of the water at the predetermined position outboard, using the value of the dilution ratio corresponding to the flow rate of the washing water discharged from the scrubber to outboard.

12. The calculating method of pH according to claim 8, further comprising

controlling a flow rate of the washing water supplied to the scrubber, depending on the pH value calculated in the calculating of the pH value of the water at the predetermined position outboard.

13. The calculating method of pH according to claim 12, further comprising:

if the flow rate of the washing water supplied to the scrubber is larger than or equal to a predetermined allowable amount, decreasing an output of a motor which discharges exhaust gas to the scrubber to control the flow rate of the washing water supplied to the scrubber to be smaller than or equal to the allowable amount.

14. The calculating method of pH according to claim 12, further comprising

provided that the ship is determined to be at anchor, decreasing an output of a motor which discharges exhaust gas to the scrubber.