JPH08200646A - Equipment for pneumatic transportation of fly ash of refuse incinerator - Google Patents

Abstract

PURPOSE: To transport fly ash of a refuse incinerator stably to a fly ash storage tank. CONSTITUTION: A system wherein a blower 6 for pneumatic transportation, an air heater 7, a rotary ejector 8 with a reducer, a rotary elector 9 with no reducer and a piping 10 are combined together as apparatuses for transporting/ stably fly ash caught and collected in a boiler 1, an economizer 2 and a cyclone 3 to a fly ash storage tank 4, is adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transportation of fly ash collected in a refuse incinerator.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view showing an example of a conventional refuse incinerator fly ash transportation apparatus. In the figure, (1) is a boiler, (2)
Is an economizer, (3) is a cyclone, (4) is a fly ash storage tank, (5a), (5b), (5c) and (5d) are conveyors, and (11) is a transfer duct. As shown in the figure, conventionally fly ash collected by the refuse incinerator boiler (1), the economizer (2) and the cyclone (3) is conveyed by conveyors (5a), (5b), (5c), (5d). Had been transported downstream by.

[0003]

The fly ash collection position of the boiler and the cyclone and the fly ash storage tank are 50 m in view of the plant layout.
May be separated. Further, the fly ash storage tank is usually located about 20 m higher than the collection position. In this case, it is necessary to connect several conveyors in the conventional fly ash transporter, which is mechanically complicated and requires a lot of maintenance work.

On the other hand, when the fly ash of a boiler or a cyclone is pneumatically transported, since there are two fly ash drop points, it is necessary to seal it to the outside without changing the flow velocity in the pipe. Further, since this fly ash contains water and is viscous, there is a risk that it will adhere to the inside of the tube and accumulate and grow.

[0005]

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present inventor has, in a refuse incineration plant having a boiler, an economizer, a cyclone dust collector and a fly ash storage tank, a lower portion of the boiler and the economizer. Rotary ejectors provided at the outlet of the transfer duct that connects the lower part and the fly ash and the outlet of the cyclone dust collector, and the heated dry air is sent to each of these rotary ejectors via an air heater. A fly ash air transport device for a refuse incinerator, characterized in that the fly ash is transported to the fly ash storage tank through the air transport pipe by the heated dry air. is there.

[0006]

The present invention has the above-described structure, and rotary ejectors provided at the outlet of the transfer duct and the outlet of the cyclone dust collector for connecting the lower part of the boiler and the lower part of the economizer to transfer fly ash, respectively. Each rotary ejector was equipped with a blower for supplying heated dry air via an air heater, and the heated dry air was used to convey fly ash to the fly ash storage tank through an air transportation pipe. Fly ash collected by the boiler, economizer, and cyclone is stably pneumatically transported to the fly ash storage tank in the downstream.

[0007]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. In this figure, the same parts as those of the conventional one described with reference to FIG. As reference numerals newly used in FIG. 1, (6) is a blower, (7) is an air heater, (8) and (9) are rotary ejectors, and (1
Reference numerals 0) indicate pipes for pneumatic transportation, respectively.

The incineration fly ash collected by the boiler (1), the economizer (2) and the cyclone (3) is pneumatically transported via a rotary ejector (8) with a reducer and a rotary ejector (9) without a reducer, respectively. Enter the series into the pipe (10). On the other hand, the air pressurized by the blower (6) is about 9 by the air heater (7).
It is heated to 0 ° C and dried, and the fly ash collected in the air transport pipe (10) is conveyed by the rotary ejectors (8) and (9) at a flow rate of about 25 m / s to stably fly. Lead to ash reservoir (4).

Heating the shipping air to about 90 ° C.
This is because if the temperature is lower than 0 ° C, the fly ash absorbs moisture and becomes unsuitable for air transportation, and if the temperature is higher than 90 ° C, the amount of steam used increases but the energy is wasted although the effect remains the same. If the transport flow velocity is set to about 25 m / s, if the flow velocity is slower than 25 m / s, fly ash may not be transported and may accumulate or accumulate.
This is because if it is faster than 5 m / s, the tube may cause erosion due to fly ash.

FIG. 3 is a longitudinal sectional view showing a structural example of a rotary ejector (8) with a reducer provided at the outlet of the transfer duct (11), and FIG. 4 is a horizontal sectional view taken along the line IV-IV of FIG. The fly ash coming from the upstream is carried to the air flow passage narrowed by the reducer (8b) by the rotation of the rotor (8a), and is then pneumatically carried from there to the wake. A reducer is not attached to the rotary ejector (9) provided at the outlet of the cyclone (3) downstream thereof. The reason is to prevent wear of the device.

According to this embodiment, the fly ash collected by the boiler (1) and the cyclone (3) was stably carried to the fly ash storage tank (4). The transport time to the fly ash storage tank is about 2 seconds. There is no fly ash scattered around the air transportation pipe (10), which is clean. In addition, since the machine drive part is smaller than that of the conventional conveyor type, the time required for daily inspection and maintenance has been reduced to about 1/3.

[0012]

According to the present invention, the fly ash collected by the boiler and the cyclone is stably pneumatically transported to the fly ash storage tank. There is no fly ash or scatter around the transportation piping, and it is clean. Further, since the machine drive portion is smaller than that of the conventional conveyor type, the time required for daily inspection and maintenance is greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a conventional refuse incinerator fly ash transportation device.

FIG. 3 is a vertical cross-sectional view showing a structural example of a rotary ejector with a reducer.

4 is a cross-sectional view taken along the line IV-IV of FIG.

[Explanation of symbols]

(1) Boiler (2) Economizer (3) Cyclone (4) Fly ash storage tank (5a), (5b), (5c), (5d) Conveyor (6) Blower (7) Air heater (8), ( 9) Rotary ejector (10) Air transportation piping (11) Transfer duct

Claims (1)

[Claims] 1. In a waste incineration plant having a boiler, an economizer, a cyclone dust collector and a fly ash storage tank, an outlet of a transfer duct for connecting fly ash by connecting the lower part of the boiler and the lower part of the economizer and the cyclone. A rotary ejector provided at the outlet of the dust collector, and a blower for supplying heated dry air to each rotary ejector via an air heater, and the heated dry air is passed through an air transportation pipe to A fly ash air transport device for refuse incinerators, characterized in that fly ash is transported to a fly ash storage tank.