JP2014133551A - SOx REDUCTION SHIP - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a SOx reduction ship which can essentially reduce SOx in exhaust gas generated when using fuel oil C, on the assumption that fuel oil C is used as a general fuel.SOLUTION: In a SOx reduction ship, a limestone slurry storage tank 4 and a limestone slurry supply device comprising a limestone slurry supply pump 5 and a limestone slurry tank 6 are arranged in a steering engine room 12 having a relatively large area in a ship 10 and located in the vicinity of an engine room 11 to allow easy installation of large devices, a dust collector 9 is arranged in a funnel on an upper deck, an exhaust passage 2 is divided into a main engine exhaust passage 13a and a funnel exhaust passage 13b in the dust collector 9, both exhaust passages are opened and arranged so that their centers are located at positions different from each other, and exhaust gas from the main engine exhaust passage 13a is bent to flow into the funnel exhaust passage 13b.

Description

  The present invention relates to a SOx reduction ship.

  Ships are equipped with a diesel engine as a driving source, and purification of exhaust gas that removes NOx (nitrogen oxides) contained in the exhaust gas is demanded in consideration of the environment as with land vehicles. However, in the marine diesel engine, C heavy oil is various as a general fuel from the viewpoint of cost, and C heavy oil has a high sulfur content, and the exhaust gas contains SOx (sulfur oxide). There is also a need for exhaust gas purification that removes water.

  For example, Japanese Unexamined Patent Application Publication No. 2010-069999 discloses a technique related to SOx reduction technology in a ship. The one disclosed in Japanese Patent Application Laid-Open No. 2010-069999 relates to the invention name “engine exhaust gas purification system in a ship”, and “economic efficiency while saving labor in a ship entering and exiting a sea area where SOx regulation is performed” (See paragraph numbers 0006 to 0008 of the same publication) for the purpose of "compatibility with regulatory clearance" and "automatic detection of ship position that can automatically identify the current location and an engine that can switch the exhaust gas purification state" And a position relationship between the boundary of the exhaust gas regulation target sea area and the own ship is specified based on the own ship position automatic detection means, and an exhaust gas in the engine is determined based on the specified position relationship information. By adopting a configuration in which the gas purification state is switched to a state in accordance with the regulations (see claim 1 of the same publication), “ Can be cleared accurately and quickly, and can save labor and save labor by reducing the burden on the seafarer. Switching between multiple types can be done easily, accurately and quickly. By incorporating the means, the signal transmission system is simplified, so the certainty of operation is higher, and the operating cost can be reduced by reducing the amount of reducing agent used, and the exhaust gas passes through the catalyst It is possible to prevent the loss of output due to the resistance caused by the ..., and more accurately realize the clearing of the regulations and ensuring the economic efficiency while fulfilling the responsibility. '' (See paragraph numbers 0014 to 0018 of the specification of the publication).

  FIG. 3 is a schematic block diagram showing an embodiment of the invention disclosed in FIG. 1 of the above-mentioned JP-A-2010-069999. In FIG. 3, reference numeral 101 denotes an engine, 102 denotes a generator, and 103 denotes , General fuel tank, 104, low sulfur fuel tank, 106, fuel switching valve, 108, main exhaust pipe, 109, exhaust treatment device, 110, SCR reduction catalyst for NOx purification, 111, slip catalyst , 112 is a silencer, 115 is a spray port for urea water, 116 is a bypass exhaust pipe, 117 is an exhaust switching valve, 125 is a mixing tank for producing urea water, and 126 is a concentration adjusting tank for urea water. , 141 is a control device (note that the reference numeral has been changed to three digits by the applicant of the present application in order to clarify that it is a prior art).

  However, the technique disclosed in Japanese Patent Application Laid-Open No. 2010-069999 is premised on the use of expensive low-sulfur fuel as fuel oil. In the use of C heavy oil as general fuel, SOx ( This is not a technology that essentially removes (sulfur oxides), and therefore, the problem that an expensive SCR catalyst must be provided is inevitable.

JP 2010-069999 A

  In view of the above problems, etc., the present invention provides a ship capable of essentially reducing SOx in exhaust gas generated when C heavy oil is used on the premise of using C heavy oil as a general fuel. With the goal.

In order to achieve the above object, an invention according to claim 1 of the present application relates to a SOx reduction ship, wherein a limestone slurry supply device that supplies limestone slurry into an exhaust passage of a marine diesel engine, the exhaust passage, and the supply The limestone slurry supply device comprising a dust collector that collects gypsum generated by reacting with the limestone slurry is composed of a limestone slurry storage tank, the limestone slurry supply pump, and the limestone slurry tank. It is located in a steering machine room that is wide and easy to install a large device in the vicinity of the engine room, the dust collector is placed in a funnel on the upper deck, and the exhaust passage is located in the dust collector. The main engine exhaust passage and the funnel exhaust passage are divided and opened so that their centers are located at different positions. Exhaust from the exhaust passage, characterized in that it is configured so as to go through the funnel exhaust passage is bent.
The invention according to claim 2 of the present application is characterized in that, in the SOx reduction ship according to claim 1, the main engine exhaust passage is arranged in the steering machine room or in the vicinity of the outdoor engine room.
Further, the invention according to claim 3 of the present application is the SOx reduction ship according to claim 1, wherein the limestone slurry reaction gypsum is accumulated immediately below the funnel exhaust passage in the dust collector and provided so that it can be drawn out to the outside. A dust tray and a dust collecting door for taking out the dust tray are provided.

Since this invention is comprised as mentioned above, there exists an effect described below.
(1) It is possible to reduce the SOx of the exhaust gas of the main engine of the ship, and it is possible to provide an environment-friendly ship.
(2) C heavy oil can be used even when navigating the Baltic Sea or US Caribbean Sea where SOx emissions are regulated.
(3) Further, since it is not necessary to use low sulfur fuel oil, it is not necessary to equip a tank for low sulfur fuel oil.
(4) The steering machine room having a relatively large space for arrangement of devices such as a limestone slurry storage tank, a limestone slurry supply pump, and a limestone slurry tank, and in which a large device can be easily installed in the vicinity of the engine room Therefore, the SOx reduction device can be easily arranged in the ship.
(5) Slurry product gypsum accumulates in the dust collector in the dust collector placed on the upper deck, making it cheaper, opening the dust collector door provided on the upper deck, pulling out the internal dust collector, and making it cheaper to take out Therefore, it is easy to collect and clean dust.
(6) Since a limestone slurry backflow prevention device is provided in the main engine exhaust passage near the floor of the steering machine room, and a surplus slurry removal door is provided in the vicinity thereof, excess slurry accumulated in the main engine exhaust passage And gypsum that accumulates reaction can be easily removed and cleaned.

FIG. 1 is a diagram showing a first embodiment of a SOx reduction ship that is an embodiment for implementing the SOx reduction ship according to the present invention. FIG. 2 is a diagram showing an outline of a SOx reduction ship according to Example 2, which is a preferable arrangement example regarding the inboard arrangement of the SOx reduction device. FIG. 3 is a schematic block diagram showing an embodiment of the invention disclosed in Japanese Patent Application Laid-Open No. 2010-069999.

  A detailed description will be given based on the drawings showing one embodiment as a mode for carrying out the SOx reduction ship according to the present invention.

  FIG. 1 is a diagram showing a first embodiment of a SOx reduction ship that is an embodiment for implementing the SOx reduction ship according to the present invention. In FIG. 1, reference numeral 1 is a marine diesel engine (main engine) using C heavy oil as fuel, 2 is the exhaust passage, 3 is an upper deck, 4 is a limestone slurry storage tank, and 5 is a limestone slurry supply. A pump, 6 is a limestone slurry tank, 7 is a limestone slurry spraying device as a limestone slurry supply device, 8 is a limestone slurry backflow prevention device, and 9 is a dust collector.

  The SOx reduction ship according to the first embodiment removes SOx from the exhaust gas of a ship diesel engine 1 (hereinafter also referred to as “main engine 1”) fueled with C heavy oil by a lime-gypsum method. As shown, the limestone slurry spraying device 7 supplies the limestone slurry in the form of a spray into the exhaust passage 2 of the main engine 1 and reacts the limestone slurry with SOx in the exhaust gas to produce the gypsum generated. The dust is collected by the dust collector 9.

That is, the limestone slurry is prepared by suspending limestone (CaCO ₃ ) powder in water to form a limestone slurry, spraying this slurry into the exhaust passage 2, and supplying sulfur dioxide (SO ₂ ) in the exhaust gas. It is absorbed and removed, and further reacted with oxygen contained in the exhaust gas or with oxygen from the outside air to form gypsum (CaSO ₄ .2H ₂ O), which is collected by the dust collector 9. For this reason, as shown in FIG. 1, the limestone slurry storage tank 4 for storing limestone slurry in which limestone (CaCO ₃ ) powder is suspended in water is disposed on the upper deck 3, Limestone slurry is transferred from the limestone slurry storage tank 4 to the limestone slurry tank 6 via the limestone slurry supply pump 5, and the limestone slurry spraying device 7 is fed from the limestone slurry tank 6 by the feeding pressure of the limestone slurry supply pump 5. The limestone slurry is supplied to the exhaust passage 2 in a spray form.

In the SOx reduction ship according to the first embodiment, the limestone slurry storage tank 4, the limestone slurry supply pump 5, the limestone slurry tank 6, and the limestone slurry spraying device 7 are arranged on the upper deck 3, and the upper The limestone slurry backflow prevention device 8 is disposed in the exhaust passage 2 immediately below the deck 3. This takes into account the storage of the limestone slurry, the treatment at the time of leakage of the limestone slurry, or the maintainability of the limestone slurry backflow prevention device 8. However, in the arrangement relationship with other inboard structures, these various devices are not limited to the arrangement on the upper deck 3 or the arrangement in the vicinity of the upper deck 3.
However, when collecting gypsum from the dust collector 9, the dust collector 9 is superior to the upper deck 3 in terms of recovery and maintenance.

In the SOx reduction ship according to the first embodiment, the limestone slurry supplied into the exhaust passage 2 in a spray form reacts with the sulfur content in the exhaust gas of the main engine 1 to become calcium sulfite (CaSO ₃ ), and further air Oxidized with oxygen in it to become gypsum (CaSO ₄ · 2H ₂ O).
This reaction is represented by the following chemical formula.
CaCO ₃ + SO ₂ + 0.5H ₂ O → CaSO ₃・ 0.5H ₂ O + CO ₂
CaSO ₃・ 0.5H ₂ O ＋ 0.5O ₂ ＋ 1.5H ₂ O → CaSO ₄・ 2H ₂ O

  In addition, in the SOx reduction ship which concerns on the present Example 1, although the limestone slurry spraying apparatus 7 which sprays limestone slurry and supplies it in the exhaust passage 2 was used, this is the apparatus supplied by spraying. Various supply methods such as a grid method in which limestone slurry is flown on the surface of the grid-like filling, a jet bubbling method in which exhaust gas is blown into the limestone slurry, and a water column method in which limestone slurry is fountained in the exhaust passage 2 are not limited. The limestone slurry supply apparatus may be used.

  Further, in the SOx reduction ship according to the first embodiment, the dust collector 9 was originally used as the dust collector 9 having a cyclone structure that is usually used frequently for removing dust contained in the exhaust gas of the main engine 1. For example, the following bag filter type dust collector may be used.

When a bag filter type dust collector is used, a cylindrical bag-shaped bag filter made of a woven fabric or a non-woven fabric called a filter cloth is used, and the limestone slurry supplied to the exhaust gas from the main machine 1 in the exhaust gas is contained in the exhaust gas. It is based on a structure that filters and collects calcium sulfite (CaSO ₃ ) and oxidized gypsum (CaSO ₄ · 2H ₂ O) that reacts with the sulfur content. Is divided into multiple dust collection chambers, and each of the divided dust collection chambers has a large number of cylinders to which bag filters can be attached. Gypsum adhered to these bag filters is dropped at the bottom of each dust collection chamber. And a hopper for collecting them is arranged. In addition, it is not limited to dropping, and a dust collector using an intake / exhaust fan and having a suction / delivery mechanism for exhaust gas containing gypsum powder at a predetermined position may be used.

  In the bag filter system, when the exhaust gas generally passes through the bag filter at a speed of about 0.3 to 2 m / min and the pressure loss is about 1 to 2 kpa, the pressure loss of the bag filter increases as the gypsum layer attached to the bag filter surface becomes thicker. In this way, it is known that the collected gypsum is intermittently wiped off.

  Also, instead of natural fall, gypsum that adheres by forcibly spraying the gas from the back of the bag filter or applying vibration to the bag filter may be forcibly dropped. Alternatively, the selection of the bag filter in the case of the bag filter system, the structure of the dust collection chamber, etc. are also used for the purpose of collecting dust in the exhaust gas such as the temperature and humidity of the main engine 1 and the original dust collection in the exhaust gas. What is necessary is just to determine suitably according to it.

  In the SOx reduction ship according to the first embodiment, as shown in FIG. 1, limestone slurry is supplied in a spray form by the pump 5 into the exhaust passage 2 of the exhaust gas of the main engine 1, and SOx in the limestone and exhaust gas is supplied. By reacting, extracting as gypsum, and collecting the gypsum with the dust collector 9, the ship has a structure that reduces SOx in the exhaust gas, so the sea area where SOx emission is regulated, that is, the Baltic Sea and the US Caribbean When navigating the sea, the C heavy oil normally used as the fuel for the main engine 1 has a high SOx emission, so it cannot be used, and a low-sulfur fuel oil with a low SOx emission had to be used. In the SOx reduction ship according to the first embodiment, the C heavy oil that is normally used can suppress the SOx emission, so that the C heavy oil can be used even when navigating the Baltic Sea or the US Caribbean Sea. Moreover, since it is not necessary to use low-sulfur fuel oil, there is an effect that it is not necessary to equip a tank for low-sulfur fuel oil.

The inventor of the present application has come up with the SOx reduction ship according to the following Example 2 while devising the optimum ship arrangement for the SOx reduction device in the SOx reduction ship according to the first example.
FIG. 2 is a diagram showing an outline of a SOx reduction ship according to Example 2, which is a preferable arrangement example regarding the inboard arrangement of the SOx reduction device.
In FIG. 2, 10 is a ship, 11 is an engine room, 12 is a steering machine room, 13a is a main engine exhaust passage, 13b is a funnel exhaust passage, 14 is a funnel, 15 is a dust collecting tray, 16 is a dust collecting door, 17 is a surplus slurry removing door, and 18 is a residential area. About the other code | symbol, the member same as the member shown in FIG. 1 attached | subjected and demonstrated the same code | symbol.

Details of the arrangement of the SOx reduction device for the SOx reduction ship according to the second embodiment will be described with reference to FIG.
First, the SOx reduction ship according to the second embodiment is most different from the SOx reduction ship according to the first embodiment. The exhaust passage 2 is connected to the main engine exhaust passage 13a and the funnel exhaust passage 13b in the dust collector 9. The exhaust from the main engine exhaust passage 13a is bent in the dust collector 9 (the exhaust that has risen from below is separated in the dust collector 9). The direction is reversed and once turned downward and then turned upward again) so that it flows into the funnel exhaust passage 13b.

Next, in the SOx reduction ship according to the second embodiment, the arrangement of the limestone slurry storage tank 4, the limestone slurry supply pump 5, and the limestone slurry tank 6 is relatively large, and the engine room 11 It was made to arrange | position in the said steering machine room 12 with easy installation of a big apparatus in the vicinity.
Further, the main engine exhaust passage 13a is disposed in the steering machine chamber 12, and similarly, the limestone slurry is sprayed from the limestone slurry spraying device 7 to the main engine exhaust passage 13a.

  In the dust collector 9, as described above, the main engine exhaust passage 13a and the funnel exhaust passage 13b are divided so that the flow of exhaust gas is reversed in the interior thereof, and the centers thereof are located at different positions. The dust collection tray 15 that can be pulled out to the outside is disposed immediately below the opening of the funnel exhaust passage 13b in the dust collection chamber 9, and can be flattened from above the upper deck 3. By opening and closing the dust collecting door 16, it was possible to take out the gypsum which is a reaction product of limestone accumulated on the dust collecting tray 15 and SOx in the exhaust gas on the upper deck 3.

  That is, in the SOx reduction ship according to the second embodiment, the dust collector 9 is integrally disposed on the upper deck 3 in the funnel 14, and the main engine exhaust passage 13 a and the funnel exhaust are disposed inside the dust collector 9. The passage 13b is divided to constitute a flow in which the exhaust gas bends, the gypsum of the slurry product accumulates in the dust collecting tray 15 to be cheap, and the dust collecting tray 15 is opened by opening the dust collecting door, Since it is cheaper to collect, dust collection and cleaning work becomes easier.

  Further, the surplus slurry removing door 17 is provided in the main engine exhaust passage 13a near the floor surface of the steering machine room 12, and excess slurry accumulated on the limestone slurry backflow prevention device 8 and the reaction here. Thus, the accumulated gypsum and the like can be easily removed and cleaned.

  In the SOx reduction ship according to the second embodiment, the main engine exhaust passage 13a is disposed in the steering machine room 12, but this is because the limestone slurry tank 6 and the main engine exhaust are disposed. This is because a short disposition distance of the limestone slurry spraying device 7 provided in the passage 13a is required. However, if the distance between the limestone slurry tank 6 and the limestone slurry spraying device 7 provided in the main engine exhaust passage 13a is short, the main engine exhaust passage 13a is not necessarily provided in the steering machine chamber 12. It is not necessary to provide it. For example, it may be arranged in the engine room 11 across the wall of the steering machine room 12.

  The SOx reduction ship according to the present invention is used for a ship that uses C heavy oil as a fuel and is operated in a sea area where SOx emission is regulated.

DESCRIPTION OF SYMBOLS 1 Main machine 2 Exhaust passage 3 Upper deck 4 Limestone slurry storage tank 5 Limestone slurry supply pump 6 Limestone slurry tank 7 Limestone slurry spraying device 8 Limestone slurry backflow prevention device 9 Dust collector 10 Ship 11 Engine room 12 Steering machine room 13a Main machine exhaust passage 13b Funnel exhaust passage 14 Funnel 15 Dust collection tray 16 Dust collection door 17 Residual slurry removal door 18 Residential area 101 Engine 102 Generator 103 General fuel tank 104 Low sulfur fuel tank 106 Fuel switching valve 108 Main exhaust pipe 109 Exhaust treatment device 110 NOx purification SCR reduction catalyst 111 Slip catalyst 112 Silencer 115 Urea water spray port 116 Bypass exhaust pipe 117 Exhaust gas switching valve 125 Mixing tank 126 for urea water production Urea water concentration adjusting tank 141 Controller
SOx sulfur oxide
SCR (Selective Catalytic Reduction)

Claims (3)

A limestone slurry supply device that supplies limestone slurry into the exhaust passage of a marine diesel engine, and a dust collector that is disposed in the exhaust passage and collects gypsum generated in response to the supplied limestone slurry,
The limestone slurry supply device comprising a limestone slurry storage tank, the limestone slurry supply pump and the limestone slurry tank has a relatively large area in the ship, and a rudder in which a large device can be easily installed in the vicinity of the engine room. Placed in the take-up room,
The dust collector is disposed in a funnel on the upper deck, and the exhaust passage is divided into a main engine exhaust passage and a funnel exhaust passage in the dust collector, and is opened so that the centers thereof are different from each other. The SOx reduction ship, which is arranged and configured so that the exhaust from the main engine exhaust passage is bent and flows into the funnel exhaust passage.   2. The SOx reduction ship according to claim 1, wherein the main engine exhaust passage is disposed in the steering machine room or in the vicinity of an outdoor engine room. 2. The dust collector according to claim 1, further comprising: a dust collecting tray provided so that limestone slurry reaction gypsum is accumulated and can be pulled out to the outside, and a dust collecting door for taking out the dust are provided immediately below the funnel exhaust passage in the dust collector. The SOx reduction ship described.

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