JP2003201827A - Soot removing system and its operating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove soot from the exhaust gas using the body of a soot removing device when a diesel power generation device is to be started. <P>SOLUTION: The body 40 of the soot removing device is structured so that the exhaust gas introduced from an exhaust gas inlet 20 is passed through an outer filter 34, centrifugal fluidized bed 33, and inner filter 36 and exhausted from an exhaust gas outlet 22 upon passing via an inner flow pipe 30. Quarts sand is used as the fluidizing substance to form the centrifugal fluidized bed 33, and a rotor 21 is rotated by a main shaft 11 at a high speed to perform purification of the exhaust gas. Thereby the soot in the exhaust gas is removed when the diesel power generation device is to be started, and thereafter the exhaust gas is bypassed via a centrifugal fluidized bed 123 so as not to supply to the centrifugal fluidized bed 33 after the rated operation is established. That is, the flow of the exhaust gas is changed between at starting and during the rated operation. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot removing system for removing soot contained in exhaust gas discharged from an internal combustion engine such as a diesel engine and a method of operating the same.

[0002]

2. Description of the Related Art Diesel power generators are used in various environments such as hotels and buildings, but the area around the exhaust port thereof turns black due to the soot contained in the exhaust gas, impairing the aesthetics.

As measures against this, measures such as cleaning around the exhaust port and repainting are taken, but it requires a great deal of cost and it is necessary to repeatedly implement the measures.

Therefore, in recent years, a device for removing soot contained in the exhaust gas of a diesel power generator has been studied.

Here, Japanese Patent Application Laid-Open No. 4-322 discloses that soot (dust, dust, etc.) contained in the exhaust gas of a diesel power generator is removed by a device having a centrifugal fluidized bed.
There is 724. FIG. 16 is a vertical sectional front view and a sectional view taken along line AA of the soot removing device using the fluidized bed reactor of FIG. 16 (a) regarding the “exhaust gas processing device” according to JP-A-4-322724. A description will be given based on (b).

Reference numeral 82 is a flow reactor having a cylindrical structure,
The flow reactor 82 has a cylindrical surface as a dispersion plate 83, and end plates 84 and 85 are connected to both sides of the dispersion plate 83 to form a cylindrical structure. The outer surface of the central portion of the one end plate 84 is fixed to the drive shaft 86, and one end of an exhaust pipe 87 having the same axis as the drive shaft 86 is fixed to the central portion of the other end plate 85. There is.

Reference numeral 88 is a catalyst, and reference numeral 89 is a filter. The filter 89 includes the drive shaft 86 and the exhaust pipe 8
7 is a cylindrical structure having the same axis as 7. The filter 89 suppresses discharge of the particulated catalyst 88 and dust (soot, etc.).

A pulley 90 is provided on the drive shaft 86, and a pulley 90 of the diesel power generator is connected to a rotary shaft (not shown) of the diesel power generator via a drive transmission mechanism such as a reduction mechanism and a drive belt (not shown). The rotation drive corresponding to the rotation speed is transmitted to the drive shaft 86.

Reference numeral 91 denotes an exhaust gas introduction outer cylinder having a diameter larger than that of the fluidized bed reactor 82 and provided so as to cover the entire fluidized bed reactor 82, the drive shaft 86 and a part of the exhaust pipe 87. Is. An exhaust gas introduction pipe 92 that is directly connected to an exhaust pipe (not shown) of the power generator is provided on one side of the introduction outer cylinder 91.

Here, when the diesel generator is started, the rotational drive thereof drives the drive shaft 86 via a speed reduction mechanism and a drive transmission mechanism. The fluidized bed reactor 82 and the exhaust pipe 87, which are directly connected to the drive shaft 86, are rotated, and the catalyst 88 in the fluidized bed reactor 82 is dispersed by the centrifugal force to the dispersion plate 83.
It is made to flow so as to stick to the inner surface of the.

Then, the exhaust gas of the diesel power generator is introduced into the exhaust gas introduction outer cylinder 91 from the exhaust gas introduction pipe 92, and the exhaust gas passes through the dispersion plate 83 due to the gas pressure of the exhaust gas from the diesel power generator and the catalyst After passing 88, it is discharged as purified gas. At this time, soot in the exhaust gas is collected and collected when passing through the fluidized bed formed of the catalyst 88.

[0012]

Exhaust gas through an exhaust gas treatment apparatus having a centrifugal fluidized bed has a reduced pressure loss as compared with a fluidized bed reactor in a gravity field, but it has been experimentally measured. As a result, the pressure loss increases in proportion to the number of revolutions of the centrifugal fluidized bed as shown in the relationship diagram between the number of revolutions of the centrifugal fluidized bed and the pressure loss. It cannot be said that sufficient exhaust for the source is possible.

For example, if exhaust gas becomes insufficient while the diesel engine is in operation, a serious situation such as stop of the diesel engine or damage of the diesel engine may be caused. There is a problem that it ends up.

In order to avoid these situations, there is a problem that it is necessary to increase the size of the apparatus in order to remove soot in the exhaust gas and secure sufficient exhaust.

The present invention has been made to solve the above problems, and is a soot removing device capable of removing soot in exhaust gas discharged from an internal combustion engine without affecting the internal combustion engine due to pressure loss. A method of operating a soot removing device is provided.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an exhaust gas pipe line through which exhaust gas containing soot from an internal combustion engine flows, and the above-mentioned exhaust gas pipe. A soot removing means that is disposed in the passage and that discharges soot after removing the soot in the exhaust gas and then discharges the soot removing means in the exhaust gas pipeline via a direction switching valve. It is characterized in that a bypass pipe for bypassing is provided.

A second invention is the soot removing system of the first invention, wherein the soot removing means comprises a soot removing device main body in which a centrifugal fluidized bed made of fluidized particulate matter is formed. The exhaust gas containing soot discharged from the internal combustion engine is introduced into the exhaust gas to exhaust the exhaust gas after soot removal.

A third invention is characterized in that, in the soot removing system according to the first or the second invention, silica sand is used as the fluidized particulate matter.

A fourth invention is characterized in that, in the soot removing system according to any one of the first to third inventions, a part or all of the catalyst of the fluidizing substance is catalyst particles.

A fifth aspect of the present invention is a method of operating the soot removing system according to any one of the first to fourth aspects of the invention, wherein exhaust gas from an internal combustion engine is introduced into the exhaust gas pipeline. However, when the soot amount of the exhaust gas discharged from the internal combustion engine is large, the exhaust gas is introduced into the soot removing device main body, and when the soot amount in the exhaust gas is small, all or part of the exhaust gas is sooted. It is characterized in that the directional control valve is operated so as to bypass the bypass pipe and discharge it without introducing it into the main body of the removing device.

A sixth aspect of the invention is the soot removing system according to the second aspect of the invention, wherein the exhaust gas from the internal combustion engine is introduced into the exhaust gas pipeline, and the soot amount of the exhaust gas discharged from the internal combustion engine is reduced. When the amount of soot is large, the exhaust gas is introduced into the soot removing device main body, and when the amount of soot in the exhaust gas is small, the exhaust gas is introduced so as to be in contact with the soot removing device main body and collected by the exhaust gas temperature and the catalytic action. It is characterized in that the generator of the internal combustion engine is operated while burning and removing soot.

In a seventh aspect of the present invention, in the method for operating the soot removing system according to the second or sixth aspect of the invention, the amount of soot from the time of starting the internal combustion engine to the time of rated operation is large, and It is characterized by driving when there are few.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION When the diesel engine was actually operated and the amount of soot discharged was confirmed, as shown in the graph of soot discharge in FIG.
It was confirmed that 0 to 90% or more) was discharged at the time of starting (to idling).

Therefore, the applicant pays attention to this point, and exhausts the exhaust gas from the fluidized particulate matter (silica sand, etc.) through the soot removing device constituting the centrifugal fluidized bed only at the time of starting (to idling). Soot removal was performed, and the soot removal device and piping were configured so as to eliminate the influence of the pressure loss on the engine by bypassing the soot removal device during the subsequent rated operation (Fig. 13). And FIG. 14). Embodiments of the present invention will be described below with reference to the drawings. The arrows in the figure indicate the flow of exhaust gas.

(Embodiment 1) FIG. 1 is a structural explanatory view of a soot removing apparatus main body according to a first embodiment of the present invention, in which reference numeral 40 is a soot removing apparatus main body. Exhaust gas is exhaust gas inlet 2
It enters from 0, is dispersed by the baffle plate 18 of the reducer 19, passes through the outer filter 34, the centrifugal fluidized bed 33, and the inner filter 36, then passes through the inner passage pipe 30, and is discharged from the exhaust gas outlet 22.

One main shaft 11 passes through the center of the main body, and both ends thereof are supported by bearings 14 fixed by C-rings 13 for holes. A space between the first casing 35 and the second casing 352 is sealed by an inner passage pipe labyrinth 31 attached to an inner passage pipe 30 provided in the rotor 21. The inner pipe 30 is supported by an inner pipe pillar 29 which is erected on the main shaft 11. The main shaft 11 and the first casing 35 are sealed by a shaft labyrinth 23 and a shaft labyrinth casing 28 provided in the front bearing chamber 37.
The rotor 21 is provided with a rotor labyrinth 17 so as not to project the protrusions in the axial direction.

Similarly, the main shaft 11 and the second casing 32 are sealed by an axial labyrinth 23 and an axial labyrinth casing 28 provided in the rear bearing chamber 27. The main shaft 11 and the motor main shaft 26 of the motor 25 are connected by a flex coupling 24. A ceramic bush 15 fixed by a shaft C ring 12 is inserted between the main shaft 11 and the bearing 14 to prevent heat transmitted from the rotor 21 from the main shaft 11 from reaching the bearing 14. Further, a heat sink fan 16 is provided on the rotor 21 side of the heat insulating ceramic bush 15 to forcibly absorb and dissipate heat transmitted from the rotor 21 to the main shaft 11. The corrugated spring 38 absorbs the axial extension including the main shaft 11 and the rotor 21. Reference numeral 39 indicates an exhaust gas side surface outlet.

FIG. 2 is a sectional view showing details of the bearing portion of the soot removing apparatus main body. Reference numerals 37 and 27 denote a front bearing chamber 37 and a rear bearing chamber 27, respectively. Since the front bearing chamber 37 and the rear bearing chamber 27 are provided with the air intake port 42 and the air discharge port 43, the heat sink fan 16 is rotated so that air is discharged from the air intake port 42 like a centrifugal fan. Inhale and exhale from the air outlet 43. At this time, the cold air 44 sucked from the air intake 42 cools the blades 42 that have become hot due to the heat transmitted from the main shaft, and thus becomes warm air 45 and is discharged from the air discharge port 43.

Unlike the normal centrifugal fan, the heat sink fan 16 has blades (not shown) that directly radiate from the center. This is to reduce heat transfer resistance as much as possible in order to efficiently absorb heat from the main shaft.

FIGS. 3 (a) and 3 (b) are configuration diagrams in which a switching valve having two inlets and one outlet is provided in the soot removing apparatus main body 40 shown in FIG. The inlet is connected to the exhaust gas side surface outlet 39, and the other inlet is connected to the pipe 46 connected to the exhaust gas outlet 22. Then, by switching the valve body 49 of the switching valve 47, the exhaust gas is caused to pass through the soot removing apparatus body 40, and FIG.
The exhaust gas is discharged from the exhaust gas outlet 48 as shown by the arrow in FIG. 3A, or the exhaust gas is discharged from the exhaust gas outlet 48 by bypassing the soot removing device main body 40 as shown by the arrow in FIG.

Here, in FIG. 3A, the valve body 49 in the switching valve 47 is operated from the start to the rated operation.
Exhaust gas side outlet 39 side (one inlet of the switching valve 47)
Since the exhaust gas is guided to the exhaust gas outlet 22 by closing, the exhaust gas can be introduced into the soot removing device main body 40. By this operation, soot generated at the time of starting the diesel power generator can be reliably removed, and discoloration around the exhaust port is eliminated.

Further, in FIG. 3 (b), from the rated operation to the stop, the valve body 49 in the switching valve 47 closes the pipe 46 side (the other inlet of the switching valve 47) so that the exhaust gas is discharged. The gas bypasses the soot removing device main body 40 and is guided to the exhaust gas side surface outlet 39. By this operation,
During the rated operation, the exhaust gas bypasses the soot removing device body, so that the influence of pressure loss on the engine can be eliminated.

FIG. 4 is a detailed sectional view of a switching valve and a butterfly valve for guiding the exhaust gas into the soot removing device body. FIG. 4 (a) is a direction switching valve 47 and a valve body 49 is The shaft 49a rotates about a fulcrum as shown by an arrow. Further, FIG. 4B shows a butterfly valve 49b,
By using 49c, a function similar to that of the direction switching valve 47 is provided.

Although silica sand is used as the fluidizing material for forming the centrifugal fluidized bed 33 in the first embodiment, iron ores such as lime coke, iron ore, sinter, bauxite, etc., in addition to silica sand, Ceramics such as alumina can also be used.

FIG. 5 is a sectional view showing another structure of the soot removing device main body 40 of the first embodiment. In FIG. 5, the pipe 46 is arranged on the opposite side of the motor 25 and the main shaft 11
Is formed on the hollow main shaft 11a, and the hollow main shaft 11a has
Multiple holes are drilled so that exhaust gas flows in,
One end of the pipe 21 is connected to the spindle outlet 11b of the hollow spindle 11a. A cheese joint 53 is connected to the other end of the pipe 46, and the butterfly joint 50 is connected to the cheese joint 53.
Is attached, and the opening / closing control of the butterfly valve 50 is performed by the geared motor 51 for valve opening / closing. The butterfly valve 50 is connected to the exhaust gas side surface outlet 39. In this way, the configuration in which the pipe 46 is provided on the opposite side of the motor 25 to discharge the exhaust gas is suitable when the installation space has a margin.

Further, when exhaust gas containing a large amount of soot is discharged from the start of the internal combustion engine to the rated operation, by closing the butterfly valve 50, the soot removing device main body 4
In order to pass through 0, soot is removed, and when exhaust gas with a small amount of soot is discharged during the rated operation of the internal combustion engine,
By opening the butterfly valve 50, the soot removing device body 40 is bypassed.

In the first embodiment of the present invention, the exhaust gas flow rate is low but the exhaust gas containing a large amount of soot passes through the soot removing device main body 40 from the start of the diesel engine of the internal combustion engine to the rated operation. Thus, the soot is removed, and during the rated operation, the exhaust gas main body 40, which has a large exhaust gas flow rate but does not contain much soot, is bypassed.

(Embodiment 2) FIG. 6 is a cross-sectional view showing still another structure of the soot removing apparatus main body 40 of the above-mentioned Embodiment 1. The structure of FIG. 6 has an exhaust gas inlet 20 and an exhaust gas. The pipes 46a and 46b of the outlet 22 are arranged in parallel, and the outlet filter 62 and the pit 59 for storing soot particles are also provided.
Is provided.

The configuration of FIG. 6 will be described below. The soot removing device body 40 is configured to guide the exhaust gas that has passed through the rotor outer filter 55, the centrifugal fluidized bed 33, and the rotor inner filter 56 to the hollow main shaft 57.

Here, the casing 54 is like a spiral pump, and has a structure in which a pit 59 is provided in the lower portion and an exhaust gas (purified gas) outlet 22 is provided immediately below the exhaust gas inlet 20. . The return plate 6 is located above the pit 59.
1 and a lower lid 60 is provided at the bottom. An outlet filter 62 is provided between the exhaust gas outlet 22 and the casing 54. The outlet filter 62 has a finer mesh than the rotor outer filter 55 and the rotor inner filter 56, and the rotor outer filter 55 and the rotor inner filter 5
If the size of 6's eyes is too small, it will clog, so
It suffices if it is a little smaller than the size of the particles used in the centrifugal fluidized bed 33. The entire device is surrounded by a heat insulating material 58 so that the internal temperature can be raised.

In the pit 59, soot particles in the exhaust gas are not always able to rush into the rotor outer filter 55 and often remain inside the casing 54. The pit 59 has a role of collecting and storing these soot particles. The soot particles 66 enter the pit 59 along with the flow of the exhaust gas 64, but because of the return plate 61, the exhaust gas 64 swirls and the soot particles are stopped in the pit 59. Further, in the situation of FIG. 7B, the soot particles attached to the outlet filter 62 are
In the situation of FIG. 7 (a), it is considered that it peels off and enters the pit 59 along the return plate 61. In this way pit 5
Soot particles accumulate in 9 but if an appropriate amount of particles carrying a combustion catalyst is put in pit 59, the soot particles collected when the temperature in casing 54 reaches about 400 ° C. , Can be burnt and purified automatically.

FIG. 7 is a schematic diagram showing an example of external piping of the soot removing apparatus main body 40 shown in FIG. 6 and how exhaust gas passes through the external piping.
Is a straight pipe joint 63, and the exhaust gas outlet 22 is a butterfly valve 5 that can be opened and closed by a geared motor 51 for opening and closing the valve.
One end of 0 is attached and the other end is connected to the cheese joint 53. As shown in FIG. 6, the cheese joint 53 is connected to the outlet 11b of the main shaft 11 via a pipe 46.

Here, in FIG. 7A, from the time of starting to the time of rated operation, when the butterfly valve 50 is closed, the exhaust gas 64 rushes into the rotor outer filter 55 and passes through the centrifugal fluidized bed 33, Remove soot. Then, it passes through the rotor inner filter 56, the hollow main shaft 11a, the main shaft outlet 11b, and is discharged as purified gas 65.

Next, as shown in FIG. 7B, the butterfly valve 50 is opened from the rated operation to the stop. Then, the exhaust gas 64 is guided to the outside of the rotor outer filter 55, which is a path with little pressure loss, passes through the rotor as it is, and is discharged from the exhaust gas outlet 22 through the butterfly valve 50.

Further, in FIG. 7, at the time of starting the diesel generator, the butterfly valve 50 is closed and a large amount of soot is collected in the centrifugal fluidized bed 33. After that, at the same time as shifting to the rated operation or a little earlier than that, the butterfly butterfly valve 50 is opened, and the exhaust gas 64 is caused to flow through the space between the casing 54 and the rotor outer filter 55. engine)
The temperature of the exhaust gas 64 rises as the temperature rises, and the temperature of the particles in the centrifugal fluidized bed 33 also rises.
If a particle combustion catalyst used for the centrifugal fluidized bed 33 is used, when the temperature reaches about 400 ° C., the catalyst is activated and the soot collected can be automatically burned to purify the exhaust gas. . When purifying soot by combustion, it is advisable to rotate the rotor slowly to heat the particles evenly.

By using the combustion catalyst and the direction switching valve in the soot removing device of the first embodiment of the present invention, the exhaust gas soot removing device 40 is used even when soot is not removed.
It is introduced inside and exhausted.

(Third Embodiment) First, a first example of the third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a structural explanatory view showing whether the exhaust gas is introduced into the soot removing device main body at the time of starting the diesel power generator and at the time of rated operation, or whether the exhaust gas is directly exhausted without being introduced.

FIG. 8 shows a soot removing device main body 40 connected to a pipe 71 having an exhaust gas inlet 20 and an exhaust gas outlet 22 through connecting pipes 69 and 70. A direction switching valve 47 is provided in the pipe 71 between the connecting pipes 69 and 70, and from the start of the diesel generator to the rated operation, as shown in FIG. The power supply to the heater 68 provided in the
The direction switching valve 47 is arranged as shown in FIG.
As a result, the exhaust gas is introduced into the soot removing device main body 40 from the connecting pipe 69 to remove soot.

On the other hand, when the diesel generator reaches the rated operation time, as shown in FIG. 8B, the valve body of the directional control valve 47 is raised to generate exhaust gas (at this time, the exhaust gas becomes hot exhaust gas). Is passed through the pipe 71 as shown by an arrow in the figure and is exhausted.

During the rated operation, the heater 68 provided in the soot removing device body 40 is energized to burn the soot (including dust) in the soot removing device body 40.

In FIG. 8, if soot (including dust) adheres to the catalyst in the soot removing device main body 40, the removal of soot will be deteriorated, so that the inspection door can be opened and closed (not shown). Is provided so that the catalyst particle cassette (not shown) can be easily replaced.

FIG. 9 is an explanatory view of the structure in which the exhaust gas discharged from the diesel power generator is introduced into the centrifugal fluidized bed type soot removing device shown by the broken line in the drawing through the muffler 74. As shown in FIG. 74 may be used to reduce exhaust noise from the diesel generator before soot is removed.

Unlike the directional switching valve 47 and the butterfly valve 50, a directional switching valve (not shown) capable of arbitrarily setting a rotation angle is provided at the connection port side of the pipe 71 and the connecting pipe 69, and the directional switching valve is provided. A drive geared motor is provided as a power source, and a current sensor and a comparator of an OP amplifier are provided in series in the middle of an electric wire supplying electric power to the geared motor to determine the stop position of the directional control valve.

Here, when there is a large amount of soot from the start of the internal combustion engine to the rated operation, a directional valve that can arbitrarily set the rotary drive is used to block the inside of the pipe 71 so that exhaust gas does not flow. The exhaust gas is introduced into the soot removing device main body 40. Also, when exhaust gas with a small amount of soot during rated operation of the internal combustion engine, a stop rod is provided at the connection port,
The direction switching valve whose rotation angle can be arbitrarily set is rotated to a position where it hits a stop rod and stopped, so that the connection port is slightly opened and a part of the exhaust gas is introduced into the soot removing device main body 40. For other exhaust gases, pipe 7
The gas passes through the inside of 1 and is discharged from the exhaust gas outlet 22.

Further, instead of the direction switching valve 47 and the butterfly valve 50, a valve in which a plate-shaped slide member having a hole is operated by a motor is inserted in a pipe 71 between the connecting pipes 69 and 70. By providing a slide or the like capable of disconnecting the pipe 71, the flow rate of the exhaust gas to the soot removing device main body 40 can be controlled.

As described above, the exhaust gas flow rate is small from the start of the diesel engine of the internal combustion engine to the rated operation, but the exhaust gas containing a large amount of soot is collected, and the exhaust gas flow rate is large during the rated operation. By flowing a part of the high-temperature gas containing less soot to the soot removing device main body 40, the temperature of the catalyst particles can be raised and the collected soot can be burned and purified.

Next, as a second example of the third embodiment of the present invention, a sectional view is shown in FIG. 10A and a schematic configuration diagram is shown in FIG. 10B, and its operation is shown in FIGS. This will be described with reference to (b). In FIG. 10A, reference numerals 55, 33,
Reference numerals 56 denote a rotor outer filter, a centrifugal fluidized bed, and a rotor inner filter, respectively, which have a structure for guiding the exhaust gas passing through the rotor outer filter 55, the centrifugal fluidized bed 33, and the rotor inner filter 56 to the hollow main shaft 57. The casing 54 is like a centrifugal pump, and the muffle 79
It has a double structure.

A pivot 78 is provided at a position slightly entering from the exhaust gas inlet 20, and a deflection plate 77 which rotates about the pivot 78 is provided. The pivot 78 is vertically tilted by the valve opening / closing geared motor 51. It is designed to be used. The entire device is covered with a heat insulating material 58 so that the internal temperature can be raised.

Further, in FIG. 10B, the spindle outlet 1
1b is connected to the exhaust gas outlet 22 by a cheese joint 53 via a pipe 46. Therefore, the direction in which the exhaust gas 64 enters the device and becomes the purified gas 65 and is discharged is just opposite.

Next, as shown in FIG. 11A, when the deflecting plate 77 is tilted upward, the exhaust gas 64 is guided to the inside of the muffle 79, penetrates into the rotor outer filter 55, and the centrifugal fluidized bed 33 is formed. After passing through and removing soot, it passes through the rotor inner filter 56, the hollow main shaft 57 and the main shaft outlet 1
It is discharged via 1b.

Further, FIG. 11 (b) shows the operation of the diesel generator from the rated operation to the stop. In this case, when the deflecting plate 77 is tilted downward, the exhaust gas 64 is outside the muffle 79. Is discharged to the exhaust gas outlet 22 through the rotor.

From the above, at the time of starting the diesel power generator, the deflecting plate 77 is tilted upward and a large amount of soot discharged is collected by the centrifugal fluidized bed 33. Then, at the same time as shifting to the rated operation or slightly earlier than that, the deflecting plate 77 is tilted downward so that the exhaust gas 64 is discharged from the casing 54 and the muffle 7.
If it is made to flow through the space between 9, the temperature of the exhaust gas 64 also rises as the temperature of the diesel power generator rises, the temperature of the muffle 79 also rises, and the centrifugal fluidized bed 3
The temperature of particles (silica sand) in 3 also rises. If a combustion catalyst is supported on the particles (silica sand) used in the centrifugal fluidized bed 33, when the temperature reaches about 400 ° C, the catalyst is activated and the soot collected is automatically burned and purified. You can When purifying soot by combustion, it is advisable to rotate the rotor slowly to heat the particles (silica sand) evenly.

By using the directional control valve and the combustion catalyst in the soot removing device of the first embodiment and the second embodiment of the present invention, the exhaust gas soot removing device is used even when soot removal is not performed. It is introduced into the inside 40 and exhausted.

Further, by using the directional control valve and the combustion catalyst in the soot removing device of the first embodiment of the present invention and the second embodiment of the present invention, exhaust gas is exhausted even when soot is not removed. A part of the soot is introduced into the soot removing device 40 and is exhausted.

(Embodiment 4) First, Embodiment 4 of the present invention is configured so that silica sand is partially mixed with a combustion catalyst and the soot collected is burned and removed by the exhaust gas temperature and the catalytic action. is there.

FIG. 12 is a structural explanatory view of an apparatus using a catalyst for a centrifugal fluidized bed type soot removing apparatus showing an eighth embodiment of the present invention. Silica sand particles 80 and gravel-shaped catalyst-carrying particles 81 in a rotor 21. Is included. As the catalyst-supporting particles 81, powders of zeolite or the like, which easily carry a catalyst, carrying a combustion catalyst, a denitration catalyst, etc., and then baked and solidified are crushed into gravel particles having a particle diameter of 5 to 10 mm.

The silica sand particles are partially mixed with a combustion catalyst, and the soot collected is burned and removed by the exhaust gas temperature and the catalytic action.
As the combustion catalyst, in addition to directly supporting the catalyst on the fluidized particle substance, zeolite on which a catalyst such as Cu is supported can be mixed with the fluidized particle substance and used. Can be used. Also,
When a combustion catalyst in which a catalyst such as Cu is supported on zeolite is used, the combustion catalyst is at least 20% of the entire centrifugal fluidized bed.
About 50% is mixed, and the remaining about 50% to 80% is silica sand. When collecting soot from the start of the diesel generator to the rated operation, the centrifugal fluidized bed is operated at high speed (50
The exhaust gas is discharged through the centrifugal fluidized bed by rotating at 0-2000 rpm).

Since silica sand usually has a larger specific gravity than zeolite, when the rotor 21 rotates, the silica sand particles 80 are separated into two layers with the layers of the silica sand particles 80 being outside. Therefore, the exhaust gas entering from the exhaust inlet 20 passes through the outer filter 55 of the rotor 111, the silica sand particles 80, the catalyst-carrying particles 81, and the inner filter 56 in this order, and exhausts the purified gas from the exhaust outlet 22. Also, from the rated operation of the diesel engine to the stop thereof, the valve is switched so that the exhaust gas bypasses the centrifugal fluidized bed and flows, thereby reducing the rotational speed of the centrifugal fluidized bed.

At this time, since the gravel-shaped catalyst-supporting particles 81 are fragile, they are crushed little by little and mixed with the silica sand particles 80, and the silica sand particles 80 easily come into contact with the collected particles. When the temperature of the exhaust gas rises and the temperature of the layer of the silica sand particles 80 in which the powder of the catalyst-supporting particles 81 is mixed rises, the soot collected by the action of the combustion catalyst is burned and purified. If the catalyst supported on the catalyst-supporting particles 81 is a denitration catalyst, denitration using soot as a reducing agent can also be performed. Furthermore, the catalyst-supporting particles 81 are crushed into small pieces until they can pass through the outer filter 55, and the catalyst-supporting particles 81 that have passed through the outer filter 55 are collected in the casing 54. The accumulated catalyst-supporting particles 81 are collected at the time of regular maintenance, and the reduced gravel-like catalyst-supporting particles 81 are
It must be replenished at this time, and the size must be small enough not to be lost by the next maintenance.

By using the combustion catalyst in the soot removing device main body of the first and second embodiments of the present invention, the exhaust gas is stored in the soot removing device 40 even when soot is not removed. It is introduced and exhausted.

Further, by using the combustion catalyst in the soot removing device main body of the third embodiment of the present invention, a part of the exhaust gas is introduced into the soot removing device 40 even when soot removal is not performed. Exhausted.

[0072]

As described above, according to the present invention, the exhaust gas is exhausted from the fluidized particulate matter through the soot removal device body forming the centrifugal fluidized bed only when the diesel power generator is started. By removing soot, discoloration around the exhaust port due to soot can be prevented. Further, during the rated operation of the diesel power generator, the exhaust gas is bypassed so that the exhaust gas does not flow through the soot removing device main body, so that the adverse effect on the diesel power generator due to the pressure loss can be eliminated. Furthermore, in the catalyst in the soot removing device main body, a catalyst (combustion catalyst etc.) is mixed in a part of the fluidizing substance, and exhaust gas is introduced into the soot removing device main body even when soot is not removed. By the exhaust gas temperature and the catalytic action, the collected soot can be burned and removed by the exhaust gas temperature and the catalytic action.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a soot removing device main body according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing details of a bearing portion of the soot removing apparatus main body according to the first embodiment of the present invention.

3A and 3B are configuration explanatory views in which a switching valve is provided in the soot removing apparatus main body in the first embodiment.

4A is a sectional view of a directional control valve, and FIG. 4B is a sectional view of a butterfly valve.

FIG. 5 is a cross-sectional view of the soot removing apparatus main body according to the first embodiment of the present invention.

FIG. 6 is a structural cross-sectional view of a soot removing apparatus main body according to the second embodiment of the present invention.

FIG. 7 is a configuration diagram showing an example of external piping and a flow of exhaust gas of the soot removing apparatus main body of FIG.

8A and 8B are configuration explanatory diagrams of a soot removing device main body at the time of starting and FIG. 8B is a configuration explanatory diagram of the soot removing device main body at a rated operation in the first example of the third embodiment of the present invention.

FIG. 9 is a structural explanatory view using a muffler and a centrifugal fluidized bed type soot removing device main body.

FIG. 10 (a) in the second example of Embodiment 3 of the present invention.
Configuration cross-sectional view, (b) schematic configuration diagram.

FIG. 11 is an operation diagram explanatory diagram in the second example of the third embodiment of the present invention.

FIG. 12 is a structural cross-sectional view of a soot removing device main body at the time of starting in Embodiment 4 of the present invention.

FIG. 13 is a graph showing the relationship between the operating condition of the diesel power generator and the exhaust gas containing soot.

FIG. 14 is a characteristic diagram showing the relationship between the rotational speed of the centrifugal fluidized bed and the soot removal rate.

FIG. 15 is a characteristic diagram showing the relationship between the rotational speed of the centrifugal fluidized bed and the pressure loss.

16 (a) is a block diagram of a soot removing device using a conventional fluidized bed reactor, and FIG. 16 (b) is a block diagram of a fluidized bed reactor.

[Explanation of symbols]

11 ... Spindle 20 ... Exhaust gas inlet 21 ... Rotor 22 ... Exhaust gas outlet 25 ... Motor 30 ... Internal conduit 33 ... Centrifugal fluidized bed 34 ... Outer filter 36 ... Inside filter 46 ... Piping 47 ... Switching valve 50 ... Butterfly valve 51 ... DC geared motor for opening / closing

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3G090 AA01 AA06 BA01 BA08 CB24                       DB01                 4D058 JA58 JB06 JB34 MA44 SA08                       UA25

Claims (7)

[Claims] 1. An exhaust gas line through which exhaust gas containing soot from an internal combustion engine flows, and an exhaust gas pipe arranged in the exhaust gas line for introducing exhaust gas to remove soot in the exhaust gas and then discharging the exhaust gas. Soot removing means,
A soot removing system, characterized in that the exhaust gas pipeline is provided with a bypass pipe bypassing the soot removing means via a direction switching valve. 2. The soot removing system according to claim 1, wherein the soot removing means is constituted by a soot removing device main body in which a centrifugal fluidized bed made of fluidized particulate matter is formed, and the soot removing device main body is provided with the soot removing device main body. A soot removing system characterized by introducing exhaust gas containing soot discharged from an internal combustion engine to remove soot and then exhausting the exhaust gas. 3. The soot removing system according to claim 1 or 2, wherein silica sand is used as the fluidized particulate matter. 4. The soot removing system according to any one of claims 1 to 3, wherein a part or all of the catalyst of the fluidizing substance is catalyst particles. 5. A method for operating the soot removal system according to any one of claims 1 to 4, wherein an exhaust gas from an internal combustion engine is introduced into the exhaust gas line,
When the soot amount of the exhaust gas discharged from the internal combustion engine is large, the exhaust gas is introduced into the soot removing device main body, and when the soot amount in the exhaust gas is small, the soot removing device is a soot removing device for all or part of the exhaust gas. A method for operating a soot removing device, characterized in that a directional switching valve is operated so as to bypass the bypass pipe and discharge the bypass pipe without introducing the main body. 6. The soot removal system according to claim 2, wherein exhaust gas from an internal combustion engine is introduced into the exhaust gas pipeline,
When the soot amount of exhaust gas discharged from the internal combustion engine is large, the exhaust gas is introduced into the soot removing device main body, and when the soot amount in the exhaust gas is small, the exhaust gas is introduced so as to contact the soot removing device main body. Then, the soot removing system is operated while the soot collected by the exhaust gas temperature and the catalytic action is burned and removed to operate the power generator of the internal combustion engine. 7. The method for operating the soot removal system according to claim 2, wherein the internal combustion engine is operated when the amount of soot is large from the start to the rated operation and when the amount of soot is small during the rated operation. A method of operating a soot removal system characterized by: