JPH0667494B2 - Multi cyclone cleaning device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-cyclone installed to remove dust in gas in a coal-fired boiler for thermal power generation, a refuse incinerator, a cement mill facility, etc. The present invention relates to a cleaning device that is effective in removing dust such as ash adhered to and improving dust collection efficiency.

2. Description of the Related Art FIG. 5 shows a recirculation gas system in a coal-fired boiler for thermal power generation, as an example of conventional technology. Reference numeral 1 denotes a boiler, and combustion exhaust gas from the boiler is discharged to the atmosphere or supplied to a multi-cyclone 2 which is well known as a mechanical dust collector, where dust in the gas is removed, It is returned to the boiler 1 again by the gas recirculation fan 3 and used for combustion.

As shown schematically in FIG. 6, the multi-cyclone 2 has a large number of cyclone main bodies 4 arranged in a slanted manner in the vertical direction, has a gas inlet 5 at the upper side, and dust is collected at the lower side and discharged to the outside. The hopper 6 and the gas outlets 7 are provided on the side surfaces, respectively.

FIG. 7 is an enlarged detailed view of the portion VII of FIG. 6, and a conventional cleaning device will be described below with reference to FIG.

The cyclone main body 4 is inclined and is installed in large numbers in the vertical direction, and the dust discharge port 8 below the cyclone main body 4 is connected to a dust discharge pipe 9 which extends vertically. The lower part of the dust discharge pipe 9 opens into the hopper 6 shown in FIG. A clean gas outlet pipe 11 is provided inside the cyclone body 4, and a cleaning coil 12 is inserted inside the clean gas outlet pipe 11. The cleaning coil 12 is connected to a connecting member 15 via a pin screw 13 and an arm 14. The connecting member 15 is connected to the drive shaft 16 via the drive arm 17, and these form a link mechanism. In addition, 18 is a partition wall.

Therefore, when the drive shaft 16 is rotated at an angle by a drive source (not shown), the connecting member 15 moves up and down via the drive arm 17, which causes the arm to move.
Cleaning coil through 14 and pin screw 13
12 reciprocates to remove dust adhering to the inside of the cyclone body 4.

It should be noted that this cleaning operation is performed, for example, in a form of reciprocating once every three minutes and operating at regular time intervals.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention During the operation of the multi-cyclone 2, the dust in the exhaust gas is removed from the cyclone body 4 due to the reduction of the centrifugal separation effect due to the reduction of the gas amount and the dust particle size being very fine. Not only inside, but also inside the dust discharge pipe 9 is attached or deposited. However, the conventional cleaning coil 12 provided inside the cyclone body 4 cannot clean the inside of the dust discharge pipe 9, so that the dust separated by the cyclone body 4 is discharged to the outside through the dust discharge pipe 9. However, there is a problem that the discharge pipe 9 is blocked by the adhesion and growth of the dust.

The blockage of the dust discharge pipe 9 leads to the blockage of the cyclone main body 4 located above the dust discharge pipe 9 to reduce the dust collection effect of the multi-cyclone 2, and is installed on the downstream side of the multi-cyclone 2. It will also have a serious adverse effect on various equipment and devices. For example, there is a risk that the gas recirculation fan 3 shown in FIG. 5 may be worn, the boiler tube may be thinned, and this may also cause blowout.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention according to claim 1 is characterized in that a plurality of cyclone main bodies having dust discharge ports below are inclined and arranged vertically. Further, in the multi-cyclone in which the respective discharge ports are vertically extended and connected to the discharge pipe, a dust dropping chain is suspended in the discharge pipe so as to be swingable vertically or horizontally.

According to the second aspect of the present invention, a plurality of cyclone main bodies each having a dust discharge port on the lower side are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. In the multi-cyclone, a plurality of tubular bodies integrally arranged at intervals in the vertical direction are arranged in the discharge pipe, and a movable rod is provided inside the tubular body so as to be movable relative to the tubular body. A plurality of cleaning brushes are provided around the movable rod so that the cleaning brushes are located at intervals between the tubular bodies.

Further, according to the present invention as set forth in claim 3, a plurality of cyclone main bodies having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. In the multi-cyclone, a conduit for supplying a cleaning fluid is provided in the discharge pipe in the vertical direction, and a nozzle for ejecting the cleaning fluid downward is provided at an appropriate interval in the conduit.

Still further, according to the present invention as set forth in claim 4, a plurality of cyclone main bodies having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged vertically. In this multi-cyclone, a nozzle for periodically ejecting pulsed fluid is provided downward at the uppermost portion in the discharge pipe.

According to the present invention as set forth in claim 1, dust is removed as necessary, and the chain is swung up and down or left and right to remove dust adhering to or accumulated in the discharge pipe by impact and cleaning. You can

Further, according to the present invention as set forth in claim 2, the cleaning brush can be opened by moving the movable rod, and dust adhering to or accumulated in the discharge pipe can be scraped off for cleaning.

Further, according to the present invention as set forth in claim 3, by supplying the cleaning fluid to the conduit and jetting it downward from the nozzle, the dust adhering to or accumulated in the discharge pipe is blown downward to perform cleaning. can do.

Furthermore, according to the present invention of claim 4, the pulse fluid is periodically ejected downward from the nozzle to blow down dust adhering to or accumulated in the discharge pipe to clean it. You can

Embodiments Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 4c. In these figures, the same parts as those in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a view of a portion corresponding to FIG. 7 of the related art, which is shown for explaining a preferred embodiment of the present invention described in claim 1.

In FIG. 1, reference numeral 30 denotes, for example, a "steel" dust dropping chain suspended vertically and horizontally in the dust discharge pipe 9, and its upper end is attached to a top plate 29 of the multi-cyclone. It is swingably connected to one end of a substantially V-shaped curved arm 24 which is swingably held by a fixed support member 23. One end of a first drive arm 25 is rotatably connected to the other end of the curved arm 24, and the other end of the first drive arm 25 is connected to one end of a second drive arm 26. The other end is rotatably connected to the uppermost arm 14 for the cyclone body 4.

The cleaning device configured as described above operates as follows. That is, when the connecting member 15 moves up and down by rotationally driving the drive shaft 16, the shaft 27 connecting the second drive shaft 26 and the arm 14 for the uppermost cyclone body 4 rotates. , This movement is the second and the first drive arm 26,25
Is transmitted to the bending arm 24 via the and to swing the bending arm 24. Therefore, the dust drop chain 30 swingably connected to one end of the curved arm 24 swings up, down, left, and right, so that the dust attached to or accumulated in the dust discharge pipe 9 is dropped by the impact, and the hopper It is discharged to the outside via 6

Although the dust removing chain 30 is interlocked with the movement of the cleaning coil 12 of the cyclone main body 4 in this embodiment, it may be driven by an independent drive source without interlocking.

2a and 2b show a preferred embodiment of the present invention according to claim 2, in which the present invention has a plurality of openable / closable cleaning brushes 32 mounted on a movable rod 31 disposed in the dust discharge pipe 9. It is a thing.

That is, the movable rods 31, to which the plurality of cleaning brushes 32 are attached at a predetermined interval, are arranged on the same straight line with a space therebetween and are integrally connected by a suitable connecting means (not shown). The cleaning brush 32 is inserted in the movable tube (tubular body) 33 of the
Is located. The uppermost movable tube 33 is made longer than the other movable tubes, and the upper and lower ends of the movable tube 33 are attached to the top plate 29 and the uppermost lid 34 of the dust discharge tube 9, respectively.
It pierces through a and 35b movably.

The movable rod 31 and the movable tube 33 are vertically movable by independent drive sources (not shown). Then, as shown in FIG. 2b, by moving the movable rod 31 downward with the movable pipe 33 stopped, the cleaning brush attached to the movable rod 31 is moved.
Reference numeral 32 changes from the closed state shown by the solid line to the opened state shown by the dotted line, and the brush end spreads so as to come into contact with the inner wall of the dust discharge pipe 9.

Therefore, by moving the movable rod 31 and the movable pipe 33 downward at the same time with the cleaning brush 32 opened in this way, the dust adhering to or accumulated in the dust discharge pipe 9 is scratched by the cleaning brush 32. It is dropped and dropped, and is discharged to the outside through the hopper 6.

On the other hand, during normal operation without removing dust, the movable rod 31
Is moved upward to bring the cleaning brush 32 into a closed state, so that the dust in the dust discharge pipe 9 is not hindered from falling.

The cleaning brush 32 and the movable tube 33 can be maintained and inspected by removing the seal members 35a and 35b, then pulling up the entire movable tube 33, and then pulling up the movable rod 31.

Further, as a modified example, each movable tube 33 is fixed to the dust discharge tube 9 side to be a fixed tube, and not only the movement of the movable rod 31 can open and close the cleaning brush 32 but also scrape off the dust. You can also

Next, FIGS. 3a and 3b show a preferred embodiment of the present invention according to claim 3, and the present invention is to remove dust by compressed air or superheated steam without depending on mechanical operation. is there.

In FIG. 3a, 41 is a conduit inserted in the dust discharge pipe 9 and is fixed to the top plate 29 of the multi-cyclone by a fixing member 42a. Further, a lid 43 is provided on the upper end portion of the dust discharge pipe 9, and the conduit 41 is also fixed to the lid 43 by a fixing material 42b. The conduit 41 located inside the dust discharge pipe 9 is provided with a large number of cleaning nozzles 44 facing downwards at appropriate intervals. This cleaning nozzle
For example, 44 is formed in a three-pronged shape as shown in FIG. 3b, but may be a two-pronged shape or the like.

A cleaning fluid such as compressed air or superheated steam is introduced into the conduit 41, the timing of which is the same as the operation of the cleaning coil 12 of the cyclone body 4.
For example, the operation is performed at fixed time intervals such as once every three minutes. Therefore, due to the compressed air (or superheated steam) ejected from the cleaning nozzle 44, the dust that has adhered to or accumulated in the dust discharge pipe 9 is blown downward and falls, and is discharged to the outside through the hopper 6. It

The maintenance and inspection of the conduit 41 and the cleaning nozzle 44 can be performed by removing the conduit fixing members 42a and 42b and then pulling the conduit 41 upward.

4a, 4b and 4c show a preferred embodiment of the present invention according to claim 4, wherein the present invention periodically sends pulsed air from the cleaning nozzle 51 into the dust discharge pipe 9 to remove dust. Is to do.

That is, the cleaning nozzle 51 is provided at the tip of the conduit 52, and is arranged in the upper part of the uppermost dust discharge pipe 9. The conduit 52 is fixed to the top plate 29 and the uppermost lid 54 of the dust discharge pipe 9 by fixing members 53a and 53b, respectively.

The conduit 52 extends through the top plate 29 and is connected to the header 55. The header 55 is connected to the solenoid valve 57 in the pressure tank 56 through the conduit 58, and the pressure tank 56 is connected to the compressor 60 through the conduit 59. Further, a check valve 61 is installed in the middle of the conduit 58 to prevent backflow of gas containing dust.

Then, the air compressed by the compressor 60 is transferred to the conduit 59.
Stored in the pressure tank 56 through. Then, the compressed air in the pressure tank 56 is converted into pulsed air at a constant time interval (for example, once every 3 minutes like the operation of the cleaning coil 12 of the cyclone body 4) by the solenoid valve 57 and the check valve. It is supplied to the header 55 through the valve 61, and is then jetted to the dust discharge pipe 9 from the cleaning nozzle 51 of the conduit 52 located in the uppermost part of the dust discharge pipe 9 of each row installed in the multi-cyclone.

Thus, the periodic pulsed air jetted from the cleaning nozzle 51 causes pulsation of the gas flowing in the dust discharge pipe 9 to drop the dust attached or accumulated in the dust discharge pipe 9. , Is discharged to the outside through the hopper 6.

In addition, the maintenance inspection of the cleaning nozzle 51 and the conduit 52,
This can be done by removing the conduit fixing members 53a, 53b and then pulling the conduit 52 upward.

Effects of the Invention As described in detail above, according to the present invention, since the dust in the dust discharge pipe can be removed, the dust collection efficiency of the multi-cyclone is significantly improved, and it is installed on the downstream side of the multi-cyclone. It is possible to obtain the effect of preventing wear and thinning of the existing gas recirculation fan and boiler tube.

[Brief description of drawings]

FIGS. 1, 2a, 3a and 4a are enlarged internal views showing four different examples of a multi-cyclone having a cleaning device according to the present invention, and FIG. 2b is used in the present invention of FIG. 2a. Vertical cross-sectional view of an essential part showing an example of a cleaning brush,
FIG. 3b is a cross-sectional view of an essential part showing an example of the cleaning nozzle used in the present invention of FIG. 3a, and FIG. 4b is an example of a piping system for the cleaning nozzle used in the present invention of FIG. 4a. Fig. 4c is a left side view of the main part showing Fig.
Fig. 6 is a system diagram showing a gas circulation system in a thermal power generation boiler, etc., Fig. 6 is a schematic explanatory diagram of a multi-cyclone, Fig. 7
FIG. 6 is a view for explaining a conventional cleaning device.
FIG. 7 is an enlarged internal view of a multi-cyclone showing an enlarged detail of a part VII. 1 ... Boiler, 2 ... Multi cyclone, 4 ... Cyclone body, 6 ... Hopper, 8 ... Dust outlet, 9 ...
Dust discharge pipe, 12 …… Cleaning coil, 30 …… Dust dropping chain, 31 …… Moveable rod, 32 …… Cleaning brush, 33 …… Moveable pipe, 41 …… Conduit, 44 …… Cleaning nozzle, 51 …… Cleaning Nozzle, 52 …… Conduit, 56
...... Pressure tank, 57 …… Solenoid valve, 60 …… Compressor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Yamaguchi 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (72) Inventor Yoshito Iwasaki 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industry Co., Ltd.Nagasaki Shipyard Co., Ltd. (72) Inventor Keizo Miki 1-2-1, Kasugadai, Nishi-ku, Kobe-shi, Hyogo (56) References: 59-82562 (JP, U) JP 42-17956 JP, B1)

Claims (4)

[Claims] 1. A multi-cyclone in which a plurality of cyclone bodies each having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. A cleaning device for a multi-cyclone, characterized in that a dust dropping chain is suspended in the discharge pipe so as to be swingable vertically and horizontally. 2. A multi-cyclone in which a plurality of cyclone bodies each having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. A plurality of tubular bodies that are integrally connected at intervals in the vertical direction are arranged in the discharge pipe, and a movable rod is inserted into the tubular body so as to be movable relative to the tubular body. A cleaning device for a multi-cyclone, characterized in that a plurality of cleaning brushes are provided around the circumference of the tubular body so as to be located at intervals between the tubular bodies. 3. A multi-cyclone in which a plurality of cyclone bodies each having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. A multi-cyclone cleaning device characterized in that a conduit for supplying a cleaning fluid is provided in the discharge pipe in the vertical direction, and a nozzle for ejecting the cleaning fluid downward is provided at an appropriate interval in the conduit. 4. A multi-cyclone in which a plurality of cyclone main bodies each having a dust discharge port below are inclined and arranged vertically, and each discharge port is connected to a discharge pipe arranged so as to extend vertically. A cleaning device for a multi-cyclone, characterized in that a nozzle for periodically ejecting a pulsed fluid is provided downward at the uppermost part of the discharge pipe.