Amount-of-seawater control device for scrubber, amount-of-seawater control method for scrubber, and amount-of-alkali control device

Patent metadata

Field	Value
Publication number	US-10099175-B2
Application number	US-201615205431-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Jul 18, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A control device for a scrubber includes a converter which calculates a minimum amount of seawater: a minimum amount of seawater necessary for an absorption reaction of the sulfur oxide by the seawater, from an engine output and a sulfur content of fuel oil; another converter which calculates a corrected amount of seawater: an amount of seawater at which the sulfur oxide in the exhaust gas discharged from the scrubber is equal to or less than a set value; a summing element which calculates a set amount of seawater by summing the minimum amount and corrected amount of seawater; a pump control device which implements control such that seawater corresponding to the set amount is supplied to the scrubber; and an alkalinity setting device which sets the alkalinity of the seawater in accordance with traveled waters. The amount of seawater supplied to the scrubber is adjusted based on the alkalinity.

First claim

The invention claimed is:

1. An amount-of-seawater control device for controlling an amount of seawater supplied to a scrubber that cleans sulfur oxide contained in exhaust gas from an engine by bringing the sulfur oxide into contact with the seawater, the amount-of-seawater control device comprising:
a minimum-amount-of-seawater converter configured to calculate a minimum amount of seawater necessary for an absorption reaction of the sulfur oxide by the seawater based on an output of the engine, a sulfur content of fuel oil, an alkalinity of the seawater set in accordance with waters traveled by a vehicle including the amount-of-seawater control device, and a limit value for a concentration of sulfur oxides in the exhaust gas, the limit value corresponding to the location of the waters traveled by the vehicle;
an amount-of-seawater correction converter configured to calculate a corrected amount of seawater to apply to the minimum amount of seawater on the basis of a differential between the concentration of the sulfur oxide contained in the exhaust gas discharged into the atmosphere from the scrubber and a set value for the concentration of sulfur oxides determined from the limit value; and
a pump control device which implements control of a seawater pump such that a set amount of seawater, corresponding to the minimum amount of seawater corrected by the corrected amount of seawater, is supplied to the scrubber.

2. The amount-of-seawater control device for a scrubber according to claim 1 , further comprising:
an alkalinity setting device configured to set an alkalinity of the seawater in accordance with the location information of the waters traveled by the vehicle,
wherein the minimum-amount-of-seawater converter adjusts the amount of seawater supplied to the scrubber based on the alkalinity set by the alkalinity setting device.

3. The amount-of-seawater control device for a scrubber according to claim 2 , wherein the alkalinity setting device stores alkalinity data of the seawater for a plurality of locations corresponding to waters traveled by the vehicle.

4. The amount-of-seawater control device for a scrubber according to claim 3 , further comprising an electronic location determining system which measures a current location and outputs location information based on the current location measured by the electronic location determining system,
wherein the alkalinity setting device sets the alkalinity on the basis of the location information, of waters traveled by the vehicle, output from the electronic location determining system.

5. The amount-of-seawater control device for a scrubber according to claim 4 , further comprising an alkalinity measurement device configured to measure the alkalinity of the seawater,
wherein the alkalinity setting device is configured to control the alkalinity measurement device to measure the alkalinity of ambient seawater in locations corresponding to waters traveled by the vehicle for which the alkalinity has not previously been stored.

6. The amount-of-seawater control device for a scrubber according to claim 5 , further comprising an alkali coefficient converter configured to calculate an alkali coefficient corresponding to the location information of waters traveled by the vehicle, in response to a command from the alkalinity setting device,
wherein the minimum-amount-of-seawater converter is configured to adjust the amount of seawater supplied to the scrubber on the basis of the alkali coefficient.

7. The amount-of-seawater control device for a scrubber according to claim 1 , further comprising an emission ratio setting device configured to output a command to the minimum-amount-of-seawater converter so as to adjust the amount of seawater supplied to the scrubber in accordance with an emission ratio of sulfur dioxide to seawater.

8. The amount-of-seawater control device for a scrubber according to claim 1 , further comprising a proportional-integral-derivative (PID) controller configured to implement PID control of a differential between a concentration of the sulfur oxide contained in the exhaust gas discharged into the atmosphere from the scrubber and the set value, and configured to supply an operation amount to the amount-of-seawater correction converter.

9. The amount-of-seawater control device for a scrubber according to claim 1 , wherein the pump control device has a plurality of inverters and a pump flow rate setting device configured to start and stop operation of a pump by the plurality of inverters, and configured to change the flow rate of the pump, in accordance with the set amount of seawater.

10. The amount-of-seawater control device for a scrubber according to claim 2 , further comprising an electronic location determining system which measures a current location and outputs the location information based on the current location measured by the electronic location determining system,
wherein the alkalinity setting device sets the alkalinity on the basis of the location information, of waters traveled by the vehicle, output from the electronic location determining system.

11. The amount-of-seawater control device for a scrubber according to claim 10 , further comprising an alkalinity measurement device configured to measure the alkalinity of the seawater,
wherein the alkalinity setting device is configured to control the alkalinity measurement device to measure the alkalinity of ambient seawater in locations corresponding to waters traveled by the vehicle for which the alkalinity has not previously been stored.

12. The amount-of-seawater control device for a scrubber according to claim 2 , further comprising an alkalinity measurement device configured to measure the alkalinity of the seawater,
wherein the alkalinity setting device is configured to control the alkalinity measurement device to measure the alkalinity of ambient seawater in locations corresponding to waters traveled by the vehicle for which the alkalinity has not previously been stored.

13. The amount-of-seawater control device for a scrubber according to claim 2 , further comprising an alkali coefficient converter configured to calculate an alkali coefficient corresponding to the location information of waters traveled by the vehicle, in response to a command from the alkalinity setting device,
wherein the minimum-amount-of-seawater converter is configured to adjust the amount of seawater supplied to the scrubber on the basis of the alkali coefficient.

14. The amount-of-seawater control device for a scrubber according to claim 4 , further comprising an alkali coefficient converter configured to calculate an alkali coefficient corresponding to the location information of waters traveled by the vehicle, in response to a command from the alkalinity setting device,
wherein the minimum-amount-of-seawater converter is configured to adjust the amount of seawater supplied to the scrubber on the basis of the alkali coefficient.

15. An amount-of-seawater control method for a scrubber which controls an amount of seawater supplied to a scrubber that cleans sulfur oxide contained in exhaust gas by bringing the sulfur oxide into contact with seawater, the amount-of-seawater control method comprising:
calculating a minimum amount of seawater necessary for an absorption reaction of the sulfur oxide by the seawater based on an engine output, a sulfur content of fuel oil, an alkalinity of the seawater set in accordance with a location of waters through which a vehicle including the scrubber travels, and a limit value for a concentration of sulfur oxides in the exhaust gas, the limit value corresponding to the l

Assignees

• Fuji Electric Co Ltd

Inventors

• Takahashi Kuniyuki
• Inui Takashi

Classifications

• B01D2252/1035

  Sea water · CPC title

• Y02T10/20

  Cross-Sectional Technologies · mapped topic

• B01D2251/304

  of sodium · CPC title

• B01D2259/4566

  for use in transportation means · CPC title

• B01D53/504 Primary

  characterised by a specific device · CPC title