SHIP FLUE GAS DESULPHURIZATION METHOD AND EQUIPMENT

• US 20100206171A1
• Filed: 06/13/2008
• Published: 08/19/2010
• Est. Priority Date: 06/13/2008
• Status: Active Grant

• Current Assignee: Sigan Peng
• Original Assignee: Sigan Peng
• Inventors: Peng, Sigan
• Granted Patent: US 8,038,774 B2
• Time in Patent Office: Days
• US Class Current: 96/235
• CPC Class Codes: B01D 2252/1035 Sea water
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2258/012 Diesel engines and lean burn gasoline engines
• CPC Class Codes: B01D 2259/4566 for use in transportation means
• CPC Class Codes: B01D 53/1481 Removing sulfur dioxide or sulfur trioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/507 by treating the gases with other liquids
• CPC Class Codes: B01D 53/78 with gas-liquid contact
• CPC Class Codes: F01N 13/004 specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water for submerged exhausting F01N13/12; treating exhaust by using liquids F01N3/04
• CPC Class Codes: F01N 3/04 using liquids
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

This invention involves ship flue gas desulphurization method and system. It employs seawater to reduce SO₂ and other pollutant discharged by ship. The method includes seawater scrub, acidic seawater transfer, deacidification, and discharge processes. The system includes a scrubber and a water-saving deacidification device. Upper portion of the scrubber comprises a scrubbing section which is connected with scrubbing seawater pump by pipelines. Lower portion of the scrubber comprises a cooling section. One end of the scrubber links the ship engine smoke pipe by a scrubbing inlet pipe, and the other end links the scrubber to a scrubbing outlet pipe. The water-saving deacidification device lies below the scrubber and is connected with it. The water-saving deacidification device is coupled to a blending seawater pump, fan, and total drain pipe for discharging seawater after deacidification. This invention provides high desulphurization efficiency, and requires small seawater quantity.

Claims

1. A ship flue gas desulphurization (FGD) method, comprising:

A) cooling followed by scrubbing high-temperature flue gas containing SO₂ from ship engine, wherein said scrubbing is done with seawater in a scrubber, and discharging the scrubbed clean gas;

B) transferring acidic seawater formed during the scrubbing process due to the absorption of SO₂ to a water-saving deacidification device;

C) blending acidic seawater in the water-saving deacidification device with alkaline seawater, making mixed seawater, and aerating the mixed seawater; and

D) discharging the seawater after deacidification once the seawater is deemed suitable for discharging into the sea.

2. The ship FGD method of claim 1, wherein the scrubbing in step A) using seawater in the scrubber comprises scrubbing in a packing scrubbing section of the scrubber.

3. The ship FGD method of claim 1, wherein the deacidification process in step C) includes blending alkaline seawater into the water-saving deacidification device, wherein a flow of the alkaline seawater is regulated by a first regulating means that regulates the flow by opening adjustable valves and/or output adjustable pumps;

and wherein a flow of air that blown into the water-saving deacidification device in the aeration process in step C) is regulated by a second regulating means that regulates the flow by opening adjustable valves, dampers and/or adjustable fans.

4. The ship FGD method of claim 1, wherein a flow of scrubbing seawater in said scrubbing process in step A) is regulated by a third regulating means that regulates the flow by opening adjustable valves and/or output adjustable pumps.

5. The ship FGD method of claim 3, wherein regulating means are employed to regulate flue gas emission and seawater discharge according to environmental requirements of sailing areas of the ship, wherein the regulating means comprise a manual controller and/or a desulphurization controller device.

6. The ship FGD method of claim 4, wherein regulating means are employed to regulate flue gas emission and seawater discharge according to environmental requirements of sailing areas of the ship, wherein the regulating means comprise a manual controller and/or a desulphurization controller device.

7. The ship FGD method of claim 1, wherein is the method further comprises an impurity separating process between scrubbing and deacidification, wherein the impurity separating process comprises:

first separating impurities by a separator, followed by discharging through a waste outlet.

8. A ship FGD system that uses the FGD method in claim 1, wherein the system comprises:

a scrubber, wherein an upper part of the scrubber comprises a packing scrubbing section which is connected to a scrubbing seawater pump by pipelines, and a lower part of the scrubber comprises a cooling section, and wherein one end of the scrubber is coupled to a ship engine smoke pipe through a scrubbing inlet pipe, and an opposite end of the scrubber is coupled to a scrub outlet pipe; and

a water-saving deacidification device located below and coupled to the scrubber;

wherein the water-saving deacidification device is coupled to a blending seawater pump, a fan, and a total drain pipe for discharging seawater that is suitable for discharge after deacidification.

9. The ship FGD system of claim 8, wherein the said water-saving deacidification device further comprises:

a blending alkaline seawater passage having an alkaline seawater flow regulator installed therein, wherein the alkaline seawater flow regulator comprises one or more of an opening adjustable valve and an output adjustable pump; and

an air inlet passage having an air flow regulator installed therein, wherein the air flow regulator comprises one or more of an opening adjustable valve, a damper, and an output adjustable fan.

10. The ship FGD system of claim 8, wherein the scrubber further comprises a scrubbing seawater passage having a scrubbing seawater flow regulator installed therein, wherein the scrubbing seawater flow regulator comprises one or more of an opening adjustable valve, and an output adjustable pump.

11. The ship FGD system of claim 9, wherein the various opening adjustable valves and the damper comprise levers, and the various output adjustable pumps and the output adjustable fan comprise electrical speed governors, wherein said levers and electrical speed governors are coupled to a desulphurization controller.

12. The ship FGD system of claim 10, wherein the various opening adjustable valves and the damper comprise levers, and the various output adjustable pumps and the output adjustable fan comprise electrical speed governors, wherein said levers and electrical speed governors are coupled to a desulphurization controller.

13. The ship FGD system of claim 8, wherein the scrubber comprises:

a shell;

a packing scrubbing section;

a cooling section, wherein the cooling section is located under the packing scrubbing section; and

a water tank.

14. The ship FGD system of claim 8, wherein an impurity separator is installed between the scrubber and the water-saving deacidification device.

15. The ship FGD system of claim 11, wherein the desulphurization controller comprises a commanding apparatus, one or more sensors, a central processing unit (CPU), one or more actuators, and a global sea area position system.

16. The ship FGD system of claim 12, wherein the desulphurization controller comprises a commanding apparatus, one or more sensors, a central processing unit (CPU), one or more actuators, and a global sea area position system.