JPH0435700Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hearth ash discharging device for a pulverized coal furnace for discharging hearth ash generated within the furnace of a pulverized coal furnace.

[Prior Art] As shown in FIG. 4, a conventional pulverized coal furnace burns pulverized coal in a furnace a to heat a heating tube b. When pulverized coal burns in the furnace a, ash is generated, and part of the ash is discharged from the furnace through the exhaust pipe c, but the other part is transferred from the hopper d provided in the hearth to the conveyor e. It was discharged, and further carried out to a silo (not shown) outside the furnace by a conveyor e, and stored in the silo.

[Problems to be solved by the invention] In the case of the above-mentioned method, in order to burn the pulverized coal by bringing the inside of the furnace a into a state of negative pressure compared to the outside air, the hopper d
The outlet of the hopper d was sealed with water to prevent outside air from entering through the outlet. Therefore, the ash generated in the furnace a is discharged from the hopper d to the conveyor e, mixes with water, and is stored in the silo in this state, so the stored ash solidifies inside the silo. , making it difficult to remove from the silo.

In view of the above-mentioned problems, the present invention provides a hearth ash discharge device for a pulverized coal furnace, which is provided with a box body for opening and closing the discharge port of the hopper so that the ash can be taken out in a dry state.

[Means for Solving the Problems] The present invention provides a hearth ash discharge device for a pulverized coal furnace that has a chute for discharging hearth ash below the furnace body. Shutters and holes are formed on the top plate and the bottom plate of the box to alternately block and open the chute, and holes are formed between adjacent opening edges of these holes in the direction of reciprocating movement of the box. The chute is separated by at least a distance, and an inclined plate is provided between these holes to allow the hearth ash to slide down.

[Function] The present invention uses a box-like structure in which the chute is provided with holes and shutters alternately formed in the top plate and the bottom plate, and an inclined plate provided to allow hearth ash to pass through these holes. Since the chute can be opened and closed, the ash to be discharged is temporarily stored inside the box through the hole in the top plate, then the box is moved and the chute is closed with the shutter on the top plate, and the hole in the bottom plate is opened to discharge the ash. Therefore, it is possible to prevent outside air from entering the furnace from the chute when discharging the ash.

[Example] An embodiment of the present invention will be described with reference to the drawings.

Figures 1 to 3 show the present invention.
2 is a chute (upper part), 3 is a box body, and 4 is a chute (lower part) for transferring ash to a silo (not shown) by means of fluid. The ends of the chute 2 and 4 have the same diameter and are located at the same position when viewed from above. The box body 3 is located so as to cross and partition between the chute 2 and 4, and is provided so as to be able to reciprocate by means of a fluid cylinder or the like, and the chute 2 and 4 can be opened and closed by the reciprocating movement. ing. That is, the box body 3 has a hole 6 that is slightly smaller than the chute 2 on one end side of the top plate 5, and a hole 8 that is slightly smaller than the chute 4 is provided on the bottom plate 7 facing the top plate 5 on the opposite side of the hole 6 of the top plate 5. It is located at the end. Box body 3
The periphery of the fluid cylinder 13 is formed in a sealed manner by the side plates 9, 10, 11 and the inclined plate 12, and one end of the fluid cylinder 13 is fixed to the outer surface of the side plate 10 facing the inclined plate 12. The holes 6 and 8 are horizontally spaced apart from each other in the reciprocating direction of the box body 3, and the chute 2, 4
The bottom plate 7, which serves as a shutter, closes the chute 4 while the chute 2 and the hole 6 are in communication, and the bottom plate 7 closes the chute 4 while the hole 8 and the chute 4 are in communication. The chute 2 can be closed by a top plate 4 serving as a shutter. The inclined plate 12 is provided so that the holes 6 and 8 can communicate with each other, and is inclined at an angle of inclination α that is larger than the angle of repose of the ash discharged from the hopper 1. Therefore, the ash discharged from hopper 1 is discharged from chute 2.
If it falls into the box body 3 through the hole 6, the inclined plate 12
slide down toward hole 8 along the slope of
It is designed so that it can be discharged downwards.

Guide plates 14 and 15 are provided at the ends of the chute 2 and 4, respectively. Guide grooves 16 are provided at both end edges of each of the guide plates 14 and 15, so that both end edges of the top plate 5 and bottom plate 7 of the box body 3 can be sandwiched and the movement of the box body 3 can be guided.

Further, the guide plate 14 is designed to close the hole 6 when the box body 3 moves and the hole 6 in the top plate 5 moves to a position away from the position of the chute 2, and the guide plate 15 closes the hole 6 in the bottom plate 7. When hole 8 is moved to a position away from chute 4, hole 8
is starting to close. With such a configuration, the box body 3 is moved to a position where the chute 2 and the hole 6 of the top plate 5 communicate with each other, as shown by the solid line in FIG. When discharging the air, the bottom plate 7 closes the chute 4, and the hole 8 in the bottom plate 7 is closed by the guide plate 15, so that outside air does not enter the box 3 through the hole 8, and the inside of the furnace is not connected to outside air. will be cut off. Even if the ash moves along the inclined plate 12 to the hole 8, it is prevented from falling by the guide plate 15 and is retained in the box body 3. At this time, the chute 4 is closed by the bottom plate 7 and is therefore isolated from the outside air. In order to transport the ash retained in the box 3 to the chute 4, move the box 3 to the position shown by the dotted line in FIG. body 3
The ash retained therein is discharged into the chute 4 through the hole 8. At this time, the top plate 5 closes the chute 2, so the inside of the furnace is isolated from the outside air, and the guide plate 14 closes the hole 6 in the top plate 5, so
The outside air does not enter into the box body 3 through the hole 6 and is shut off from the outside air. Therefore, by repeating the above operations, the ash generated in the furnace can be easily transferred from the hopper 1 in a dry state to the silo outside the furnace by the fluid flowing through the chute 4.

[Effects of the invention] In summary, the present invention has the following effects.

(1) When discharging ash from the chute, the chute is opened and closed by the reciprocating movement of the box, so ash can be discharged while the box isolates the inside of the furnace from outside air.

(2) This allows the ash to be carried out in a dry state, making it easy to carry out the ash.

(3) Furthermore, since the ash is carried out in a dry state, it will not solidify even if it is stored in the silo.
Removal from the silo is also easier.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a perspective view of the box of the present invention, and Figure 3 is the X in Figure 1.
-X arrow view and FIG. 4 are cross-sectional views of the conventional example. In the figure, 2 and 4 are shoots, 3 is a box body, 5 is a top plate, 6 is a hole in the top plate, 7 is a bottom plate, 8 is a hole in the bottom plate, 1
2 is an inclined plate.

Claims (1)

[Scope of utility model registration request] In a hearth ash discharge device for a pulverized coal furnace that has a chute for discharging hearth ash below the furnace body, a box body that is reciprocated across the chute is provided in the middle of the chute, and the top plate of the box body and Shutters and holes are formed in each of the bottom plates to alternately block and open the chute, and opening edges of these holes that are close to each other are separated by at least a distance that separates the chute in the reciprocating direction of the box body, and A hearth ash discharge device for a pulverized coal-fired furnace, characterized in that an inclined plate is provided between these holes to cause the hearth ash to slide down.