JPS5929772B2 - Ash discharge device of coal-fired furnace - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an ash discharge device for a coal combustion furnace, and in particular, a device for discharging combustion ash falling to the bottom of a coal combustion furnace to the outside of the furnace in a dry and high temperature state. This invention relates to an ash discharge device for a coal-fired furnace.

[Background of the invention]

Generally speaking, coal combustion furnaces in combustion boilers in thermal power plants are equipped with an ash discharge device to discharge the combustion ash from the coal that falls to the bottom of the furnace out of the furnace. The ash will be disposed of in a landfill at ℃.

In the conventional combustion furnace ash discharge system, the ash is extinguished with water or after rapid cooling using a water pool hopper, a water spray set hopper, a water immersion type ash removal device, etc. installed at the bottom of the combustion furnace. It is crushed and discharged.

Recently, due to changes in energy information, pulverized coal has been increasingly used in combustion furnaces of combustion boilers in thermal power plants.

In this pulverized coal combustion furnace, it is expected that a large amount of combustion ash will be generated.

There are limits to the disposal of such large amounts of coal ash in landfills due to the lack of suitable land.

On the other hand, effective use of coal ash is required from the perspective of recycling waste resources.

One example of a method for effectively utilizing coal ash is a method of melting coal ash and turning it into fibers by centrifugal force or air blowing to form mineral wool, which is then used for heat insulating materials and the like.

When implementing this method, it is necessary to heat and melt the coal ash to a predetermined viscosity.

When coal ash is heated and melted in this manner, if the coal ash is melted or brought to a high temperature state in advance, the basic unit of heating and melting energy can be reduced.

[Problems with background technology]

However, in conventional combustion furnace discharge devices, the fire is extinguished or cooled with water as described above, so when implementing the above method, there is a problem that the discharged coal ash must be heated and melted from the beginning. There is.

In addition, in a slag tamp type combustion furnace, the ash is molten, so the combustion ash can be discharged outside the furnace in its molten state, but this slag tamp type combustion furnace burns at high temperatures, so thermal nitrogen oxidation is required. Recently, this slag tump type combustion furnace is rarely used due to the problem of the generation of Nx.

[Purpose of the invention]

The present invention was developed in view of the problems of the prior art, and is capable of discharging combustion ash in a dry and high temperature state, ensuring airtightness at the bottom of the combustion furnace, and The purpose of the present invention is to provide a combustion furnace ash evacuation device that can withstand high temperatures.

[Summary of the invention]

In the present invention, a continuous flow conveyor is installed at the bottom of the furnace so as to run across the falling surface of the combustion ash, and a receiving surface is installed in contact with the lower surface of the upper extending part of this conveyor. It is.

A fly ash supply device for supplying fly ash discharged from the combustion furnace is provided at a position on the front side of the traveling portion of the upper stretched portion.

Further, by providing a discharge port on the surface of the receiver at a position on the rear side of the travel in the upper stretched portion, the discharge port is discharged to the outside of the furnace laterally from between the upper and lower stretched portions.

A continuous flow conveyor is one in which a plurality of attachment members are connected in a ring with a chain and stretched around a driving wheel and a driven wheel. It refers to something that pushes the chain in the direction of movement.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings.

In FIGS. 1 to 3 showing an embodiment of the present invention,
The ash evacuation device 1 of the combustion furnace is provided at the bottom 2 of the combustion furnace.

This ash discharge device 1 includes a casing 3, a continuous flow conveyor 4, a receiving surface 5, an insulated powder supply device 6, and a discharge port 1.

The furnace bottom 2 is formed in the shape of a hopper with a water-cooled wall, and allows the combustion ash 8 in the combustion furnace to fall therein.

The casing 3 is formed below the furnace bottom 2 so as to cover the entire surface on which the ash 8 falls.

Inside this casing 3, the continuous flow conveyor 4 is stretched so as to cross the falling surface of the ash 8, and this conveyor 4 runs in one direction by driving wheels 9 and driven wheels 10. ing.

The continuous flow 0-conveyor 4 of this embodiment has a third
As shown in the figure, an appropriate number of elongated rectangular attachment members 12 are protruded from both sides of a chain 110 stretched between the driving wheel 9 and the driven wheel 10 at right angles to the longitudinal direction and at equal intervals. It becomes.

In this embodiment, the receiving surface 5 is placed close to the lower surface of the upper extending portion of the conveyor 4.

The insulating powder supply device 6 includes a hopper 14 that stores fly ash 13 as an insulating powder at °C, a rotary feeder 15 provided at the lower end opening of the hopper, and a discharge port of the rotary feeder 15. The fly flounder 13 stored in the hopper 14 is fed to the rotary feeder 15.
and the conveyor 4 via the screw feeder 16
It is designed to be supplied to a position on the front side of the vehicle in the lower suspension portion of the vehicle.

A leveling member 11 is provided on the upper surface of the front side of the lower stretching portion of the conveyor 40 to which the lime 13 is supplied, for leveling the supplied flyash 13 uniformly over the entire surface of the conveyor 4. is provided, and the fly ash 13 leveled by the leveling member 17 is placed on the adjacent attachment members 12, 1 of the conveyor 4.
The gap between the two is evenly filled.

The discharge port I has a receiver facing the rear side of the conveyor 4 on the upper side of the conveyor 4 and is open to the surface 5, and a hopper (not shown) is connected to the discharge port 1 in the lateral direction. A row feeder (not shown) is provided in the lower opening of this hopper.

The operation of the combustion furnace ash discharge device according to the above configuration will be explained.

When the combustion furnace starts operating and the combustion ash 8 begins to fall from the furnace bottom 2, the continuous flow conveyor 4 rotates in one direction, and the heat insulating powder supply device 6 starts operating.

As a result, the fly ash 13 is supplied from the hopper 14 via the rotary feeder 15 and the screw feeder 16 to the upper surface of the front side of the conveyor 4 in the upper stretched section, and is spread by the leveling member 11 as the conveyor 4 advances. It fills the gap between the attachment members 12, 12, and is slightly higher (and evenly spread) than the attachment member 12.

As the conveyor 4 advances, the spread 130 layers of fly ash move along the receiver 5 to the attachment member 12.
It is gradually moving while being pushed by (.

The fly ash 130 layer progresses without particles moving due to friction between fly ash particles.

The combustion ash 8 that has fallen from the furnace bottom 2 is spread over the lower side of the conveyor 40 and is being moved by the fly ash 1.
You will be in a state where you have fallen onto the 30th floor and been hit.

The combustion ash 8 received by the fly ash layer reaches the discharge lower as the conveyor 4 advances, and the fly ash 1
3 and fall into the discharge port I from the gap between the attachment members 12 and 12.

The combustion ash 8 and flyash 13 that have fallen into the discharge port I pass through a hopper (not shown) and are discharged to the outside of the furnace via a rotary feeder (not shown).

Note that in order to encourage the fly ash and combustion ash to fall from the gap between the attachment members 12 and 12 of the continuous flow conveyor 4, a scraping means such as a wire brush may be provided in the vicinity of the discharge port 1.

Further, in order to prevent the combustion ash 8 from adhering to the attachment member 12 in the lower stretched portion corresponding to the return side of the conveyor, it is preferable to install a swinging device on the chain 11 to swing the chain.

Furthermore, the fly ash 13 is attached to the attachment member 12.
．． It is preferable that the leveling member 11, which is evenly filled and laid in the gaps of 12, has a multi-stage structure in order to make the leveling condition even more uniform. , the leveling member 11 may be omitted if uniform laying can be achieved.

Incidentally, the fireproof structure of the seals and casings of each bearing such as the driving wheel and the driven wheel may be made as appropriate.

According to this example, (1) airtightness at the bottom of the combustion furnace is almost maintained, so combustion is not affected (
, combustion ash can be discharged at high temperature.

Since the combustion ash can be discharged at a high temperature, when heating and melting the ash to form fibers, it is possible to reduce the heating energy consumption required to obtain the viscosity necessary for fiberizing the ash.

In addition, (1) Since it is a dry ash discharge device that does not use any water, there is no need for a water treatment device to treat waste water containing combustion ash.

Furthermore, (1) the ash discharge device can be installed by simply replacing the ash dumper in an existing combustion furnace, so it can be applied to existing combustion furnaces.

- By providing the discharge port I between the upper and lower suspension parts, the height of the entire device can be reduced, which is advantageous for installing this device in an existing combustion furnace.

■The fly ash used as the heat insulating powder is collected by an electrostatic precipitator or the like from the same coal combustion furnace to which this device is installed.

Therefore, there is no need to separately purchase other heat insulating powder.

〔Effect of the invention〕

As described above, according to the present invention, ash from a combustion furnace can be discharged outside the furnace in a dry and high temperature state.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the section ■ in Fig. 1, and Fig. 3 is the same (an enlarged perspective view). 1... Combustion Furnace ash discharge device, 2... Furnace bottom, 3... Casing, 4... Continuous flow conveyor, 5... Receiving surface, 6
...Insulated powder supply device, I...Discharge port, 8...Combustion ash, 9...Drive wheel, 1
0... Driven wheel, 11... Chain, 1
2... Attachment member, 13...
Friance, 14... Hopper, 15...
... Rotary feeder, 16 ... Screw feeder, 17 ... Leveling member.

Claims (1)

[Claims] 1. In an ash discharge device for a combustion furnace that dries and discharges combustion ash that falls to the bottom of a coal combustion furnace to the outside of the furnace in a high-temperature state, a continuous flow conveyor is installed at the bottom of the furnace and runs across the surface on which the combustion ash falls. At the same time, a temperature receptacle is laid in contact with the lower surface of the upper stretched part of this continuous flow conveyor, and a fryer discharged from the combustion furnace is installed at a position on the front side of the upper stretched part of the continuous flow conveyor. On the other hand, at a position on the rear side of the travel in this upper suspension part, the said receiver is provided with a discharge port in its surface, so that it is provided with a flywheel supplying device for supplying a flywheel. An ash discharge device for a coal-burning furnace, characterized in that the ash is discharged outside the furnace.