JPH0428970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ash extraction device that is disposed directly below the bottom of a coal-fired boiler or the like and discharges clinker while cooling it.

To explain a conventional ash extraction device for bottom ash (clinker) of a coal-fired boiler, as shown in Figs. The conveyor flight 3 arranged on the trough 2 allows the furnace bottom 1a to be
The clinker a that has fallen from the furnace is cooled by the cooling water b and is transferred to the right side in the figure (in the direction of the arrow) and discharged from the rising part 2a, and the seal plate 4 is removed from the furnace bottom 1a. It has a vertical structure and is an extremely shallow mechanical continuous ash extraction device.

In addition, since the boiler 1 uses coal that has a component that explodes when rapidly cooled as fuel,
The ash removal device is designed to make the depth of the cooling water b in the trough 2 as shallow as possible so that the clinker a gradually absorbs water and is cooled.

However, in the conventional ash extraction equipment, in the case of a large-capacity boiler, the width of the furnace and the distance of the shallow part become long, and as shown in Fig. 3, a huge clinker a.
When the clinker (a) falls, the upper part of the clinker (a) becomes difficult to be cooled by the cooling water (b) and is slowly cooled excessively. It may be difficult to crush to size, which may cause problems in discharge. Furthermore, clinkers that fall continuously may combine with each other to form a giant clinker.

The present invention was developed in view of the above-mentioned circumstances, and includes a shallow-bottomed trough that holds cooling water directly below the furnace bottom, and a conveyor that is disposed above the shallow-bottomed trough. This ash removal device cools and discharges clinker by running a flight, and is characterized in that a cooling water injection mechanism is provided on the side of the trough, and its purpose is to inject cooling water in the trough. The object of the present invention is to provide an ash removal device that improves cooling performance and eliminates the above-mentioned drawbacks by injecting cooling water into the clinker that is slowly cooled by the clinker so that the entire clinker is cooled.

The present invention has the above-mentioned configuration, in which a shallow-bottomed trough holding cooling water is provided directly below the furnace bottom, and a conveyor flight provided on the shallow-bottomed trough is run to cool the clinker. In the ash extraction device that discharges the clinker while discharging the ash, a cooling water injection mechanism is provided on the side of the trough, so the depth of the cooling water in the trough is made shallow to prevent rapid cooling of the clinker and explosion. When the clinker falls into the cooling water, the cooling water is injected onto the clinker in the cooling water, and even if it is a huge clinker, it receives an even cooling effect as a whole, achieving an appropriate cooling rate, and the cooling water is sprayed onto the clinker in the cooling water. The clinker is prone to cracking and becomes brittle, and the clinkers are prevented from bonding to each other, so the cooling performance of the clinker is significantly improved, and the clinker is prevented from condensing, making it easier to crush, and the ash extraction performance is significantly improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 4 and 5, in which 1 is a coal-fired boiler, 1a is a hearth bottom, 12
Reference numeral 3 indicates a shallow-bottomed trough that is disposed directly below the furnace bottom 1a and holds cooling water b, and 3 is a conveyor flight that is disposed on the shallow-bottomed trough 12 and is operated by a drive mechanism not shown. The above structure is similar to that of the device shown in FIG. 1, and is a shallow mechanical continuous ash extraction device.

Further, in the embodiment of the present invention, the packing 11 is placed along the flange 12b provided at the upper edge of the side plates 12a, 12a of the trough 12.
Seal trough 10 containing seal water c via
At the same time, seal plates 4a and 4b are vertically installed from the hearth bottom 1a, and the lower end of the seal plate 4b is immersed in the seal water c.
and the trough 12, and furthermore, the side plates 12a, 12 of the trough 12 are
A plurality of cooling water injection nozzles 15 are arranged at appropriate intervals in the length direction of the side plates 12a, 12a, and are connected to a common cooling water supply pipe. 16 and connected to a cooling water supply source (not shown), it can continuously inject cooling water onto the clinker a in the trough 12 in the form of a shower to cool it, and also replenishes the cooling water b in the trough 12. By installing the injection nozzle 15, the depth of the cooling water b in the trough 12 is made shallow to the minimum.

In addition, 20 in the figure is a wheel for movement provided at the lower part of the ash removal device, and can be placed directly under the hearth bottom 1a by adjusting the installation to an appropriate position.

Since the illustrated embodiment of the present invention has the above-described configuration, the conveyor flight 3 on the trough 12 is moved in the direction of the arrow shown in FIG. 1, that is, to the right in the figure, by a drive mechanism not shown. and hearth bottom 1a
The clinker a that has fallen from the trough 12 is cooled by the cooling water b in the trough 12, and is then transferred and discharged.

Further, in this embodiment, as described above, the trough 12
Since the depth of the cooling water b inside the clinker a is extremely shallow, the clinker a is not cooled down rapidly and its explosion is safely prevented. However, as shown in Fig. 3, for a relatively large clinker a, water is absorbed and cooled only at the lower part by the cooling water b in the shallow-bottomed trough 12, and the upper part is not affected by the cooling effect of the cooling water b. Almost no clinker is obtained, and the clinker becomes extremely hard due to excessive slow cooling, and furthermore, the following clinker joins and becomes huge. Cooling water is injected from the injection nozzle 15 into the clinker a, and the cooling rate of the clinker a by the injection is an appropriate one that does not cause excessive rapid cooling. a is cooled at a moderate cooling rate throughout, explosion is prevented and condensation is sufficiently inhibited, and the injected cooling water flows into the cooling water b in the trough 12.
An appropriate amount of cooling water b that does not compensate for the amount of cooling water b at shallow water depth is ensured.

In addition, to explain the case of a relatively large clinker a as shown in FIG. As the clinker is cooled at an appropriate cooling rate throughout the air, no explosion occurs, and the injection process makes the clinker more likely to crack, become brittle, and easily fracture, and the subsequent bonding of the clinker is effectively prevented. The clinker is smoothly transferred and discharged by the conveyor flight 3. Therefore, excellent effects are exhibited in clinker cooling performance, prevention of condensation, prevention of explosion, transfer and discharge, etc., and ash removal performance and reliability are significantly improved.

Further, leakage of fly ash and the like is prevented by the injection of the cooling water, and a seal between the hearth bottom 1a and the trough 12 is sealed by the water seal mechanism consisting of the seal trough 10, the seal water c, and the seal plate 4b. Performance has been significantly improved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to these embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view showing an example of a conventional ash extraction device, Figure 2 is a cross-sectional view of the minus part in Figure 1,
The figure is an explanatory diagram of the cooling state of a giant clinker, FIG. 4 is a sectional view corresponding to the - part of FIG. 1 showing an embodiment of the present invention, and FIG. 5 is an enlarged view of the V part of FIG. 4. 1... Boiler, 1a... Hearth bottom, 3... Conveyor flight, 12... Trough, 15... Injection nozzle (injection mechanism), a... Clinker, b... Cooling water, c
...Seal water.

Claims (1)

[Claims] 1. In an ash removal device, a shallow-bottomed trough holding cooling water is disposed directly below the furnace bottom, and a conveyor flight disposed on the trough runs to cool and discharge clinker. An ash extraction device characterized by being equipped with a cooling water injection mechanism.