JP2008180425A - Ash transport pipe clogging preventing device for combustion ash or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly suck and transport combustion ash by providing a simple installation on an ash transport pipe arranged in a lower part of a hopper, breaking combustion ash accumulated and clogged in the ash transport pipe, and avoiding a blocked state. <P>SOLUTION: An ash transport device is provided with the hopper 1 storing the combustion ash A trapped by a dust collector, and the ash transport pipe 2 connected to a lower end of the hopper 1 for sucking in the combustion ash A dropped from the hopper 1 and transporting it to an ash treatment device 4. A stringed member 7 like a chain is provided in the ash transport pipe 2 so as to move back and forth to break the combustion ash A clogged in the ash transport pipe 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention smooths the combustion ash, etc. clogged in the ash transport pipe when the ash generated in the boiler of a power plant and the like and accumulated in the hopper is sucked and transported to the ash treatment device through the ash transport pipe. TECHNICAL FIELD The present invention relates to an apparatus for preventing clogging of ash transport pipes such as combustion ash that is sucked and transported.

  Combustion ash generated in a boiler of a large-scale facility such as a power plant is introduced into an electric dust collector through a denitration device and an air preheater together with combustion exhaust gas, and most of it is captured by the electric dust collector. A plurality of inverted conical hoppers are installed at the bottom of the electric dust collector, and the captured combustion ash (EP ash) is accumulated in the hopper.

  The combustion ash accumulated in each hopper is sucked by a vacuum pump through an ash transport pipe and transported to an ash treatment apparatus. An air suction port is provided at one end of the ash transport pipe. When the air suction port is opened and the vacuum pump is operated, an air flow is generated in the ash transport pipe toward the silo. When opened, the combustion ash in the hopper is sucked into the ash transport pipe and transported. The transportation of the combustion ash from the plurality of hoppers is performed by sequentially opening the discharge valve one by one and sucking the combustion ash.

  For example, by opening and closing the ash intake valve (discharge valve) of such a hopper, combustion ash such as heavy oil ash in the hopper falls into the ash transport pipe, and transports the combustion ash together with warm air by evacuation. When a large amount of combustion ash falls in the ash transport pipe, the combustion ash properties, that is, heavy oil ash, has a high viscosity, so that the combustion ash tends to accumulate in the ash transport pipe and become blocked.

As a technique for preventing such clogging of combustion ash and the like, as shown in, for example, Japanese Patent Application Laid-Open No. 2001-208331 “Combustion device and its flue ash accumulation prevention method” in Patent Document 1, a furnace for burning fuel A forced air blower for supplying fuel conveying air for supplying fuel to a furnace installed in a flue provided upstream of the furnace, a primary air ventilator for conveying primary air, and smoke upstream of the furnace An air preheater which is provided between the air in the road and the downstream side of the furnace and preheats the primary air and the fuel conveying air by heat exchange with the flue gas in the flue, and a furnace provided in the flue downstream of the furnace An electrostatic precipitator for removing dust from the exhaust gas from the combustion of the fuel, an oblique flue with an upward slope along the gas flow upstream of the electric precipitator, and the bottom of the oblique flue Purge in the slant flue to blow away the ash deposited on the In a method for preventing flue ash accumulation of a combustion apparatus having a purge system in which a nozzle for blowing out a body and a purge valve is installed, air is supplied to the purge air from the downstream air flue of the primary air blower or the forced air blower. A method for preventing flue ash accumulation in a combustion apparatus using heated air obtained by joining hot air taken out from a flue downstream of a preheater has been proposed.
JP 2001-208331 A

  If the ash transport pipe is blocked, inspection and cleaning are required. There was a problem that this inspection and cleaning cost, labor and time were required. Furthermore, there is a problem that the combustion ash is scattered around by inspection and cleaning, and the scattered combustion ash needs to be further cleaned and washed.

  The “combustion device and its flue ash accumulation prevention method” in Patent Document 1 is a technique for preventing ash from accumulating in the flue. It was not a technology to prevent clogging of burned ash that was transferred from the hopper to the ash transport pipe and accumulated in the ash transport pipe.

  The present invention has been developed to solve such problems. That is, the object of the present invention is to provide a simple facility in the ash transport pipe arranged at the lower part of the hopper, to avoid the clogged state by breaking the clogged combustion ash accumulated in this ash transport pipe, An object of the present invention is to provide an apparatus for preventing clogging of ash transport pipes such as combustion ash capable of smoothly sucking and transporting combustion ash.

According to the present invention, the combustion ash (A) that accumulates the combustion ash (A) captured by the dust collector and the combustion ash (A) that is connected to the lower end of the hopper (1) and falls from the hopper (1) In order to break down the combustion ash (A) clogged in the ash transport pipe (2) in an ash transport pipe (2) for suction and transport to the ash treatment apparatus (4) An apparatus for preventing clogging of ash transport pipes such as combustion ash is provided, wherein the chain-like member (7) is provided to move back and forth in the ash transport pipe (2).
For example, the chain member (7) is a chain that spans the pulley (6). The chain member (7) is obtained by partially connecting a chain (10) to a wire (11) spanned over the pulley (6).

In the chain member (7), resistance pieces (12) having such a size that the clogged combustion ash (A) is broken are attached to the wire (11) spanned over the pulley (6) at substantially equal intervals. Is.
The chain member (7) is obtained by partially attaching a plurality of the resistance pieces (12) to a wire (11) spanned over the pulley (6).
A plurality of the chain members (7) are arranged in the ash transport pipe (2).

In the invention with the above configuration, if the chain-like member (7) such as the chain (10) is moved back and forth in the ash transport pipe (2), it accumulates at a position directly below the hopper (1) and the ash transport pipe (2). The combustion ash (A) that has closed the inside can be easily broken. The clogging of the combustion ash (A) can be eliminated without decomposing the ash transport pipe (2) as in the prior art. When the vent hole (H) is opened in the closed ash transport pipe (2) in this way, air passes through the ash transport pipe (2), and the combustion ash (A) is generated in the negative pressure ash transport pipe (2). It will be sucked and transported. Once the ventilation state is formed from the closed state, the combustion ash (A) can be easily sucked and transported.
Thus, ash accumulation in the hopper (1) due to ash clogging in the ash transport pipe (2) can be prevented, and the cost and labor required for inspection and cleaning of the ash transport pipe (2) can be reduced. it can. When the ash transport pipe (2) is inspected and cleaned, the combustion ash (A) can be prevented from scattering to the outside.

  The clogging prevention device of the present invention is a conventional ash that uses a simple member such as a chain member (7) such as a chain (10), a pulley (6), and a drive unit (8) for moving the chain member (7) back and forth. By incorporating it into the transport pipe (2), clogging of the combustion ash (A) can be easily prevented, and its versatility is high.

  In the chain-like member (7) partially connected by the wire (11), a small hole is made in the surface of the ash transport pipe (2), and this wire (11) portion is taken out of the ash transport pipe (2). This can be moved back and forth by the drive unit (8). The airtightness inside the ash transport pipe (2) can be maintained high, and the efficiency of suction transport of the combustion ash (A) can be increased.

  When the ash transport pipe (2) is piped in a horizontal state and a vertical state, by providing a chain member (7) in each ash transport pipe (2), without making the device a complicated mechanism, Clogging in the ash transport pipe (2) can be easily prevented.

  The apparatus for preventing clogging of ash transport pipes such as combustion ash according to the present invention is provided such that a chain-like member such as a chain is moved back and forth by a pulley in the ash transport pipe, and the combustion ash clogged in the ash transport pipe is broken and blocked. The combustion ash can be sucked and transported again by making a vent hole in the ash transport pipe in the state and allowing air to pass therethrough.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 is a partially cutaway schematic view showing an apparatus for preventing clogging of ash transport pipes such as combustion ash of Example 1. FIG. FIG. 2 is an explanatory cross-sectional view in which a part of the clogging prevention device according to the first embodiment is omitted.
The ash transport device of the present invention has a hopper 1 that accumulates combustion ash A such as EP ash captured by an electric dust collector disposed in a boiler flue, and has a funnel formed so that the upper end side is wide and the lower end side is narrow. The powdered combustion ash A is put into the hopper 1 from the upper part. In the vicinity of the lower end of the hopper 1, an ash intake valve (discharge valve) 3 for allowing suction of accumulated accumulation of combustion ash and the like A to the ash transport pipe 2 is provided. The hopper 1 is arranged in a plurality of rows below the electric dust collector.

The ash transport pipe 2 is, for example, a pipe having an inner diameter of about 30 cm extending in the horizontal direction connecting the lower ends of a plurality of hoppers 1 arranged in a row, and one end thereof is an air intake port provided with an intake valve. ing. The other end of the ash transport pipe 2 is connected to the ash treatment device 4, and the ash transport pipe 2 connecting the hopper 1 and the ash treatment device 4 has a path for sucking combustion ash etc. A from the hopper 1. A vacuum pump 5 is provided. That is, when the vacuum pump 5 is operated, a negative pressure is generated in the ash transport pipe 2, and combustion ash and the like A are sucked from the hopper 1 by the inflow of air from the air suction port. The sucked combustion ash etc. A is transported to the ash treatment device 4 through the ash transport pipe 2.
In addition, the ash transport pipe manhole having an inner diameter of about 15 cm to which a detachable detachable lid is attached is formed in the ash transport pipe 2 at the connection portion with the hopper 1 for inspection and cleaning.

In the ash transport pipe 2, a chain-like member 7 composed of a chain 10 laid over a pulley 6 is provided so as to move back and forth. The chain member 7 breaks the combustion ash A clogged in the ash transport pipe 2. The chain-like member 7 manually moves a handle 9 constituting the drive unit 8 to move back and forth in the ash transport pipe 2. Alternatively, the chain member 7 is rotated in one direction.
The drive unit 8 in the illustrated example shows a structure in which a handle 9 is rotated and a chain-like member (chain) 7 is moved back and forth with a gear attached to the rotating shaft. However, the drive unit 8 is not limited to this manual structure, and may be configured to be driven by a motor (not shown).

FIG. 3 is an explanatory cross-sectional view inside the ash transport pipe showing the operating state of the clogging prevention device of the present invention, (a) is a state where the ash is blocked, (b) is a state where the clogging is broken by the chain member, (C) is a state in which clogging in the tube is eliminated and suction transportation is smooth.
Thus, if the chain-like member 7 is moved back and forth in the ash transport pipe 2, it accumulates at a position directly below the hopper 1 as shown in FIG. The combustion ash A can be easily broken. As shown in FIG. 3 (b), if a vent hole H is opened in the closed ash transport pipe 2, air passes through the ash transport pipe 2, and the combustion ash A is sucked into the ash transport pipe 2 that is set to a negative pressure. Be transported. As shown in FIG. 3C, once the ventilation state is formed from the closed state, the combustion ash A can also be sucked and transported easily.

FIG. 4 is a partial schematic view showing another embodiment of the chain member.
The chain member 7 according to the present invention can be moved back and forth in the ash transport pipe 2 to easily break down the combustion ash A that has blocked the ash transport pipe 2. It is not limited to. As shown in FIG. 4, it is possible to use a wire 11 in which a plurality of resistance pieces 12 having a size enough to break the clogged combustion ash A are attached. The chain member 7 may be bridged on the pulley 6 and moved back and forth in the ash transport pipe 2. Further, the individual resistance pieces 12 are not limited to the disk shape in the illustrated example, and may be a substantially spherical shape, a substantially cubic shape, or the like.

FIG. 5 is an explanatory cross-sectional view in which a part of the clogging prevention device of Example 2 is omitted.
In the apparatus for preventing clogging of ash transport pipes such as combustion ash of the second embodiment, a part of the chain 10 of the chain-like member 7 is a wire 11. That is, the entire chain-like member 7 is not the chain 10 but partly constituted by the wire 11. In the case where a part of the chain member 7 is connected by the wire 11, a small hole is formed on the surface of the ash transport pipe 2, and this wire 11 portion is taken out of the ash transport pipe 2 from this hole and is connected to the drive unit 8. Can be moved back and forth. The airtightness inside the ash transport pipe 2 can be maintained high, and the efficiency of suction transport of the combustion ash A can be increased.

FIG. 6 is an explanatory cross-sectional view in which a part of the clogging prevention device according to the third embodiment is omitted.
The apparatus for preventing clogging of ash transport pipes such as combustion ash according to the third embodiment is such that all chain members 7 are accommodated in the ash transport pipe 2 and moved back and forth by the handle 9 of the drive unit 8 or rotated in one direction. is there. When the entire chain-like member 7 is stored in the ash transport pipe 2, the hermeticity inside the ash transport pipe 2 can be maintained higher.

FIG. 7 is an explanatory cross-sectional view in which a part of the clogging prevention device according to the fourth embodiment is omitted.
The apparatus for preventing clogging of ash transport pipes such as combustion ash of Example 4 has a plurality of the chain members 7 arranged in the ash transport pipe 2. When the ash transport pipe 2 is piped in a horizontal state or a vertical state, the chain member 7 is provided in each ash transport pipe 2 so that the apparatus does not have a complicated mechanism. Can be easily prevented.

  In the present invention, a simple facility is provided in the ash transport pipe 2 disposed in the lower part of the hopper 1 so that the blocked ash A accumulated in the ash transport pipe 2 is broken, thereby avoiding a blocked state. As long as the combustion ash A can be sucked and transported smoothly, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  The apparatus for preventing clogging of ash transport pipes such as combustion ash according to the present invention can be used for various apparatuses for sucking and transporting powders that are highly viscous and easily clogged in the pipe, in addition to when transporting the combustion ash by breaking it. Can do.

1 is a partially cutaway schematic view showing an apparatus for preventing clogging of ash transport pipes such as combustion ash of Example 1. FIG. It is explanatory sectional drawing which a part of clogging prevention apparatus of Example 1 was abbreviate | omitted. It is explanatory sectional drawing in the ash transport pipe which shows the operation state of the clogging prevention apparatus of this invention, (a) is the state which the ash has obstruct | occluded, (b) is the state which collapsed clogging with the chain-shaped member, (c) In this state, the clogging in the tube is eliminated and the suction transportation is smooth. It is the partial schematic which shows the other Example of the chain-shaped member. It is explanatory sectional drawing which a part of clogging prevention apparatus of Example 2 was abbreviate | omitted. It is explanatory sectional drawing which a part of clogging prevention apparatus of Example 3 was abbreviate | omitted. It is explanatory sectional drawing which a part of clogging prevention apparatus of Example 4 was abbreviate | omitted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hopper 2 Ash transport pipe 6 Pulley 7 Chain member 10 Chain 11 Wire 12 Resistance piece A Combustion ash

Claims (6)

A hopper (1) for accumulating the combustion ash (A) captured by the dust collector and an ash treatment device connected to the lower end of the hopper (1) and sucking the combustion ash (A) dropped from the hopper (1) In an ash transport device comprising the ash transport pipe (2) for transporting to (4),
In order to destroy the combustion ash (A) clogged in the ash transport pipe (2), a chain member (7) is provided to move back and forth in the ash transport pipe (2). Equipment for preventing clogging of ash transport pipes such as combustion ash. The apparatus for preventing clogging of ash transport pipes such as combustion ash according to claim 1, wherein the chain member (7) is a chain spanned on a pulley (6). The ash transport of combustion ash or the like according to claim 2, wherein the chain member (7) is partially connected to a chain (10) to a wire (11) spanned over the pulley (6). Tube clogging prevention device. In the chain member (7), resistance pieces (12) having such a size that the clogged combustion ash (A) is broken are attached to the wire (11) spanned over the pulley (6) at substantially equal intervals. The apparatus for preventing clogging of ash transport pipes such as combustion ash according to claim 1, wherein 5. The chain member (7) according to claim 4, wherein a plurality of the resistance pieces (12) are partially attached to a wire (11) spanned over the pulley (6). Equipment for preventing clogging of ash transport pipes such as combustion ash. The apparatus for preventing clogging of ash transport pipe such as combustion ash according to claim 1, wherein a plurality of the chain members (7) are arranged in the ash transport pipe (2).

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