JPH0443690Y2 - - 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.

[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. 4 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 pulverized coal is burned by the pulverized combustion burner c, and the heat exchanger tube e
The process fluid passing through is heated.

In such a heating furnace a, a large amount of ash is generated as the fine powder is burned, so this ash and slag (molten fixed ash) adhere to the surface of the fine powder combustion burner c in the heating furnace a, resulting in a change in the shape of the flame. This may make it impossible to achieve the desired heating. moreover,
If deposits grow, a misfire may occur.

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. 5, 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 the burner tiles of 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 cylindrical burner tile provided around the outer periphery of the tip of the fuel nozzle, and In an apparatus for removing deposits from a fine powder combustion burner, in which a cylindrical muffle block is provided on the outer periphery of the burner tile so as to surround it, the burner tile is placed along the circumferential direction with the stationary side block. The fuel nozzle is divided into a movable side block consisting of a plurality of divided pieces, and the fixed side block is brought close to the tip of the fuel nozzle, and each of the divided pieces is radially connected to the fixed side block via a hinge joint. The movable side block is attached to the outside so that it can be expanded and moved freely, and an operating rod is connected to the divided pieces of the movable side block for deploying and moving each piece to vibrate and remove ash and slag adhering to them. It is composed of

[Function] Since the fixed side block and each divided piece of the movable side block of the burner tile are hinged, the movable side block is brought into close contact with the fixed side block during burner combustion to form a burner tile, and during cleaning, The operating rod is moved back and forth to vibrate each divided piece of the movable block, thereby removing deposits on the burner tile, especially on the surface of the movable block. Therefore, the work of removing deposits on the burner tile surface can be carried out very easily without the need to use a poking stick.

[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 flows from the fuel nozzle 3, and primary air for combustion flows from the gap between the fuel nozzle 3 and the burner tile 4.
Secondary air for combustion is supplied from the gap between the muffle block 5 and the muffle block 5, respectively.

As shown in FIG. 2, the burner tile 4 has an annular fixed side block 6 fixed to the burner casing 2 and a movable side that is hinged to the fixed side block 6 and divided into four along the circumference. It consists of block 7. Further, operating rods 9 are connected to the outer surface of each movable block 7 via connecting members 8, and these operating rods 9 penetrate the back surface of the burner casing 2 and extend out of the furnace.

That is, by moving the operating rod 9 forward, the movable block 7 is brought into close contact with the stationary block 6 as shown in FIG. 3, so that the original shape of the burner tile is formed.
By retracting the operating rod 9, the movable block 7 can be raised as shown in FIG.

Next, the operation of this embodiment will be described based on a pulverized coal burner.

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, the operating rod 9 is advanced so that the burner tile 4 performs its function, and the movable block 7 is brought into close contact with the fixed block 6 as shown in FIG.

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 9 is moved back and forth to vibrate the movable block 7. As a result, burna tile 4
The ash and slag adhering to the surface will be removed.

Incidentally, deposits on the surface of the muffle block 5 can be removed by inserting a peck rod through a viewing window (not shown) provided on the side of the furnace.

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

(1) By simply vibrating the movable block of the burner tile by operation etc., deposits on the surface of the burner tile can be easily removed.

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

[Brief explanation of the drawing]

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 perspective view of a burner tile in the embodiment, and Fig. 3 is a burner combustion of the embodiment. FIG. 4 is a plan view of a conventional pulverulent combustion heating furnace, and FIG. 5 is a sectional view of a pulverulent combustion burner to which the present invention is applied. In the figure, 3 is the fuel nozzle, 4 is the burner tile, and 5 is the fuel nozzle.
6 is a muffle block, 6 is a fixed block, 7 is a movable block, and 9 is an operating rod.

Claims (1)

[Scope of utility model registration request] A pulverized powder combustion system in which a cylindrical burner tile is provided around the outer periphery of the tip of the fuel nozzle, and a cylindrical muffle block is provided around the outer periphery of the burner tile. In an apparatus for removing deposits from a burner, the burner tile is divided into a fixed side block and a movable side block consisting of a plurality of divided pieces along the circumferential direction, and the fixed side block is removed from the tip of the fuel nozzle. At the same time, each of the divided pieces is attached to the fixed block via a hinge joint so as to be deployable and movable radially outward, and the movable block is joined, and each of the divided pieces is expanded to the divided pieces of the movable block. A pulverulent combustion burner cleaning device characterized by being connected to an operating rod for moving and applying vibration to remove ash and slag adhering to the burner.