JPH045850Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pulverulent combustion burner cleaning device, and more particularly to a device for removing ash and slag (molten hardened ash) adhering to burner tiles and pinewood blocks.

[Conventional technology] Process heating furnaces used in oil refineries and petrochemical plants mainly use oil and/or gas as fuel, but in order to solve energy problems, solid fuels such as coal, petroleum coke, charcoal, and wood have been used as fuel. Progress has been made in the development of heating furnaces that use fine powder as fuel.

FIG. 6 shows a plan view of this type of heating furnace. Powder combustion burners c are provided on a pair of opposing inner walls b of the heating furnace a, and heat exchanger tubes e are provided in a meandering manner along a side wall d. Then, the fine powder is combusted by the fine powder combustion burner c, and the process fluid passing through the heat transfer tube e is heated.

In such a heating furnace a, a large amount of ash is generated as a result of the combustion of solid fuel powder, so this ash and slag adhere to the surface of the powder combustion burner c in the heating furnace a, resulting in a change in the shape of the flame. It may be impossible to achieve the desired heating. Furthermore, the growth of deposits may cause misfires.

Therefore, in the past, the adjacent heat exchanger tube e of the side wall d was usually
A peck rod was inserted through a viewing window f for flame monitoring provided in the gap, and the ashes and slag adhering to the pulverulent combustion burner c were removed using the peck rod.

[Problems to be solved by the invention] However, the method of inserting a poking rod between adjacent heat exchanger tubes e has poor workability, especially as shown in Fig. 7, which has conventionally had high performance as an oil burner. When a burner with a triple structure is used as a fine powder combustion burner, it becomes extremely difficult to remove deposits.

That is, in this burner, a burner tile h is provided around the outer periphery of the tip of the fuel nozzle g, and a muffle block i is provided around the outer periphery of the burner tile h. , the burner tile h is scorched and functions as an ignition source, and the muffle block i has the function of forming the shape of the flame. When such a burner is used as a pulverulent combustion burner, deposits such as ash and slag mainly adhere to the surfaces of the burner tiles h and pine blocks i, but even if a poking rod is inserted through the above-mentioned viewing window, It becomes difficult to remove the deposits j on the surface of the burner tile h located inside the muffle block i.

Thus, an object of the present invention is to provide a pulverulent combustion burner cleaning device that can easily remove ash and slag adhering to a pulverulent combustion burner having burner tiles and muffle blocks.

[Means for Solving the Problems] In order to achieve the above object, the pulverulent combustion burner cleaning device of the present invention includes a burner tile that is provided around the outer periphery of the tip of the fuel nozzle, and a burner tile that surrounds the tip of the fuel nozzle. In an apparatus for removing deposits from a pulverulent combustion burner, which is provided with a muffle block surrounding the outer periphery of the pulverulent combustion burner, the muffle block is inserted from the back side of the pulverulent combustion burner and is movable in the axial direction of the fuel nozzle. an operating rod rotatably provided around the central axis of the pulverulent combustion burner; and an undulating rod provided at the tip of the operating rod for sweeping the surfaces of the burner tile and the muffle block. It is equipped with feathers.

[Function] A blade for sweeping the surface of the burner tile and pine full block is provided at the tip of the operating rod so that it can rise and fall freely, so the blade can be placed upside down while the burner is burning so as not to affect the combustion. The operating rod is moved back to the rear end of the burner, and when cleaning, the operating rod is moved forward and the blades are raised to contact the surface of the burner tile or pine full block.
Further, by rotating the operating rod around the central axis of the burner, deposits can be removed. Therefore, there is no need to use a peck stick, and the work of removing deposits can be carried out very easily.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a pulverulent combustion burner equipped with a pulverulent combustion burner cleaning device according to an embodiment of the present invention. A burner casing 2 is provided outside the furnace from a side wall 1 of the heating furnace, and a fuel nozzle 3 is provided in the center of the burner casing 2. A burner tile 4 is provided on the outer periphery of the tip of the fuel nozzle 3 so as to surround it, and a muffle block 5 is provided on the outer periphery of the tip of the burner tile 4 so as to surround it. Fine powder is supplied from the fuel nozzle 3, primary air for combustion is supplied from the gap between the fuel nozzle 3 and the burner tile 4, and secondary air for combustion is supplied from the gap between the burner tile 4 and the muffle block 5. is configured to be

Furthermore, the back surface of the burner casing 2 surrounds the outer periphery of the fuel nozzle 3 and also includes the fuel nozzle 3.
A sealing member 6 is rotatably provided around the fuel nozzle 3 , and an operating rod body 7 is inserted through a portion of the sealing member 6 so as to extend along the fuel nozzle 3 . At the tip of the operating rod body 7, there is a blade 8 that can be raised and lowered freely.
is attached, and a link mechanism is formed between the tip of the adjustment rod 9 for undulation adjustment inserted into the operation rod main body 7 and the blade 8. That is, when the adjustment rod 9 is advanced with respect to the operation rod main body 7, the blade 8
The blades 8 are configured so that when they are laid down and moved backward, the blades 8 are raised up.

Next, the operation of this embodiment regarding the pulverized coal combustion burner will be described.

First, pulverized coal pulverized by a coal mill (not shown) or the like is supplied to the fuel nozzle 3, and a combustion air supply device (not shown) supplies the fuel nozzle 3 to the fuel nozzle 3.
Primary air flows from the gap between the burner tile 4 and the burner tile 4, and the second
Next, air is supplied and combustion begins.

At this time, in order not to affect the flow of primary air and secondary air and to protect the blades 8 by keeping them away from the flame, as shown in FIG. Retract it to the rear end of the

A large amount of ash is generated in the furnace as a result of combustion, and this ash adheres or becomes slag to form deposits on the surfaces of the burner tiles 4 and muffle blocks 5.

Therefore, the operating rod main body 7 is advanced and the adjustment rod 9 is pulled to raise the blades 8, so that the blades 8 are brought into contact with the surface of the burner tile 4 as shown in FIG. Then, in this state, the operating rod main body 7 is rotated together with the seal member 6 around the fuel nozzle 3. As a result, the blades 8 sweep the entire inner surface of the burner tile 4 as shown in FIG. 2, thereby removing ash and slag that have adhered thereto.

Once the deposits on the surface of the burner tile 4 are removed in this way, the operation rod main body 7 is further advanced and the adjustment rod 9 is pulled to tighten the tips of the blades 8 as shown in FIG. It is brought into contact with the inner surface of block 5. Then, by rotating the operating rod body 7 around the fuel nozzle 3 in the same way as in the case of the burner tile 4, the tip of the blade 8 sweeps the inner surface of the pine full block 5 over the entire circumference. Deposits are removed.

In the above embodiment, the operating rod main body 7 was inserted along the outer circumferential surface of the fuel nozzle 3, but the fifth
As shown in the figure, it is also possible to use a fuel nozzle 10 with a double tube structure, insert the operating rod main body 7 and the blades 8 into the inner tube, and supply fuel from the outer tube. In this way, there is no need to rotatably provide a seal member on the outer periphery of the fuel nozzle.

[Effects of the invention] As explained above, according to the present invention, the following excellent effects are achieved.

(1) It is possible to easily remove deposits on the surface of burner tiles and pinewood blocks by simply operating the blades using the operating rod.

(2) Therefore, the maintainability of the pulverulent combustion burner is improved and stable pulverulent combustion is guaranteed.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a pulverulent combustion burner equipped with a pulverulent combustion burner cleaning device according to an embodiment of the present invention, Fig. 2 is a front view of Fig. 1, and Figs. 3 and 4 are views of the embodiment. FIG. 5 is a sectional view showing another embodiment, FIG. 6 is a plan view of a conventional pulverized combustion heating furnace, and FIG. 7 is a sectional view of a pulverized combustion burner to which the present invention is applied. be. In the figure, 3 is the fuel nozzle, 4 is the burner tile, and 5 is the fuel nozzle.
1 is a muffle block, 7 is an operating rod body, 8 is a blade, and 9 is an adjustment rod.

Claims (1)

[Scope of utility model registration request] A device for removing deposits from a pulverulent combustion burner, in which a burner tile is provided around the outer periphery of the tip of a fuel nozzle, and a muffle block is provided around the outer periphery of the burner tile. an operating rod inserted from the back side of the pulverulent combustion burner, movable in the axial direction of the fuel nozzle, and rotatable around the central axis of the pulverulent combustion burner; and a tip of the operating rod. 1. A pulverulent combustion burner cleaning device comprising: a movable blade for sweeping the surfaces of the burner tile and the muffle block.