JPH064175Y2 - Cyclone coal combustion equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention has an industrial furnace such as a boiler furnace as a furnace body, and a solid fuel such as pulverized coal, pulverized oil coke, sludge (hereinafter , Which is simply referred to as coal) is burned by swirling air for combustion, and relates to a cyclone coal combustion apparatus with a precombustor for char combustion.

[Conventional technology]

2. Description of the Related Art Conventionally, in industrial furnaces such as boiler furnaces, there has been known one in which a cyclone coal combustion furnace is provided as a front furnace (primary furnace) in a furnace body to partially burn coal.
Industrial furnaces (secondary furnaces) equipped with such a front furnace are widely used because of their excellent combustion effects.

As showing the structure of the above conventional type cyclone coal combustion furnace, for example, as shown in Japanese Utility Model Laid-Open No. 60-76717 previously proposed, while supplying pulverized coal and air into the cyclone coal combustion furnace, There is disclosed a structure in which pulverized coal is partially burned by effectively mixing and burning these as a high-speed swirling flow. That is, the fifth
As shown in the figure, a cyclone body 2 is laterally attached to a side wall of a furnace (secondary furnace) 1 such as a boiler furnace, and a coal charging port 3, a combustion swirling air supply port 4 and combustion gas are attached to the cyclone body. Is provided with a gas discharge port 5 for leading to, and a slag baffle 6 for passing the combustion gas generated in the main body 2 and stopping the molten slag is provided inside the cyclone main body 2, and faces downward to the combustion gas upstream side of the slag baffle. The cyclone coal combustion furnace 8 provided with the slag downflow port 7 is described. 10 is a slag tank, 11 is a combustion chamber, 12 is a bypass line, and 13 is a flame.

[Problems to be solved by the invention]

In a cyclone coal combustion system in which char (solid carbonaceous unburned matter) generated from the secondary furnace is collected by a cyclone (not shown), etc., and the collected char is recycled to the cyclone coal combustion furnace for secondary combustion. In some cases, it is necessary to make char that is hard to burn due to volatile components escape easily by some method.

The present invention has been made in view of the above points, and is provided with a pre-combustor for char combustion, and the char can be burned with O ₂ enriched air or air and fuel gas under favorable ignition conditions. It is intended to provide a coal combustion device.

[Means for solving problems]

In order to achieve the above object, the cyclone coal combustion apparatus of the present invention, as shown in FIGS. 1 to 3, has a cyclone body for partially burning coal by swirling air inside the side wall of the secondary furnace 1. In the cyclone coal combustion furnace 8a in which the gas discharge port 5 and the slag downflow port 7 for guiding the combustion gas to the secondary furnace are provided in the cyclone body 2, the cyclone body 2 is attached to the cyclone body 2 in the lateral direction directly or via the connection duct 14.
A vertical pre-combustor 15 is tangentially connected to the upper end of the vertical pre-combustor, and a char / air / fuel gas inlet 16 is provided at the upper end of the vertical pre-combustor.
And a burner 19 are provided, and a coal charging port 17 is provided in the axial direction at the end of the cyclone body and a coal charging port 18 is provided in the tangential direction.
Is provided in the vicinity of the gas discharge port 5, and / or the secondary furnace is provided with a coal input port 21.

In addition, the coal charging port is any one of 17, 18, 20, and 21.
One or two or more may be used in combination.

Further, as shown in FIG. 4, the cyclone coal combustion apparatus of the present invention has a vertical pre-combustor 15a at the upper end of the cyclone body 2.
Are tangentially connected, and a char / air / fuel gas inlet 16 and a burner 19 are provided at the upper end of the vertical precombustor to form a char precombustion chamber 22 in the upper part of the vertical precombustor.
Further, a coal charging port 23 is tangentially connected to the lower side of the char precombustion chamber to form a coal precombustion chamber 24 below the char precombustion chamber in the vertical precombustor.

[Action]

In the cyclone coal combustion apparatus shown in FIG. 1 to FIG. 3, the char is O ₂ -enriched air or air in the vertical precombustor 15.
The fuel gas is burned under good ignition conditions, and this combustion gas is introduced tangentially into the cyclone body 2 to burn coal efficiently.

In the cyclone coal combustion apparatus shown in FIG. 4, char and coal (pulverized coal) are pre-combusted in the same pre-combustor.
That is, in the vertical type pre-combustor 15a, stable ignition is realized by injecting O ₂ enriched air or air and fuel gas into the tea from the head to achieve stable ignition, and the high temperature combustion gas generated here is used. Then, the pulverized coal blown tangentially from the precombustor is ignited and burned.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the shape of the components described in this embodiment, the relative arrangement, etc., are not intended to limit the scope of the present invention to only those unless otherwise specified, and are merely examples of explanation. Only.

Embodiment 1 FIG. 1 shows an embodiment of the present invention. Reference numeral 2 denotes a cylindrical cyclone body for partially burning coal with swirling air inside, and this cyclone body 2 is a furnace (secondary furnace).
It is attached laterally to the side wall of No. 1 via a connecting duct 14. The cyclone body 2 may be directly attached to the side wall of the furnace 1.

The cyclone main body 2 is provided with a gas discharge port 5 and a slag flow-down port 7 for introducing combustion gas to the furnace 1 to form a cyclone coal combustion furnace 8a.

In this cyclone coal combustion furnace 8a, a vertical pre-combustor 15 is connected to the upper end of the cyclone body 2 in the tangential direction of the furnace 8a, and a char / air / fuel gas inlet 16 and an oil burner are connected to the upper end of the pre-combustor 15. 19 is provided, and an axial flow direction coal input port 17 and a tangential direction coal input port 18 are provided at the end of the cyclone body 2. A gas burner may be provided instead of the oil burner 19. Coal inlet 17,
Normally, only one of the 18 is provided, but both may be installed depending on the case.

As described above, as a coal charging method, a method of blowing from the front surface of the cyclone main body 2 in the axial flow direction and / or tangentially from the wall surface of the cyclone main body 2 is adopted. Coal charging port 2 at 14
The method of providing 0 or providing the coal charging port 21 in the secondary furnace 1 is adopted.

When the coal inlet is provided in the connection duct 14 and / or the secondary furnace 1, the coal is a reducing combustion method in which the coal is burned to the extent that only volatile matter is released, and the rest is collected as char and reburned.

FIG. 2 and FIG. 3 show an example around the char / air / fuel gas inlet 16 and the oil burner 19. That is, an O ₂ -enriched air passage 27 is formed by a partition plate 26 on the outer periphery of the charging port, an oil burner 19 is provided in the central portion, and a swirl vane 28 is inserted between the oil burner 19 and the partition plate 26 to remove char. A primary air inlet 30 is formed, and a fuel gas pipe 31 is inserted into the char / primary air inlet 30.

As the air supplied from the char / air / fuel gas inlet 16, it is desirable to use O ₂ -enriched air, but normal air may also be used. Further, as the fuel gas, a partial combustion gas of coal produced in the present combustor, a hydrocarbon such as propane, a waste gas containing hydrogen and the like are used, and as the coal, pulverized coal is used.

Embodiment 2 FIG. 2 shows another embodiment of the present invention. A vertical precombustor 15a is connected to the upper end of the cyclone body 2 in the tangential direction of the furnace 8a, and char, air, and
A fuel pre-combustion chamber 22 is formed in the upper portion of the pre-combustor by providing the fuel gas inlet 16 and the burner 19.

Furthermore, below the char pre-combustion chamber 22, a coal charging port 23
Are connected tangentially to form a coal precombustion chamber 24 below the char precombustion chamber 22 in the precombustor. 25 is an intermediate baffle. Other configurations are similar to those of the first embodiment.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

In the cyclone coal combustion apparatus according to the first aspect, the char can be efficiently burned in the vertical pre-combustor under good ignition conditions with O ₂ -enriched air (or air) and fuel gas.

Further, in the cyclone coal combustion apparatus according to claim 2, in the upper part of the vertical pre-combustor, the char is ignited with O ₂ enriched air (or air) and the fuel gas to make the ignition condition good and stable ignition is achieved. After generating combustion gas and then igniting and precombusting coal (pulverized coal) from the center to the bottom of the vertical precombustor using the above high temperature combustion gas, the high temperature combustion gas is introduced into the cyclone body. It can be introduced tangentially to efficiently partially burn coal.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of the cyclone coal combustion apparatus of the present invention, FIG. 2 is an enlarged view of a portion surrounded by a chain line circle in FIG. 1, and FIG. 3 is A- in FIG. A line sectional view, FIG. 4 is a sectional explanatory view showing another embodiment of the apparatus of the present invention, and FIG. 5 is a sectional explanatory view showing an example of a conventional cyclone coal combustion furnace. DESCRIPTION OF SYMBOLS 1 ... Furnace (secondary furnace), 2 ... Cyclone main body, 3 ... Coal input port, 4 ... Combustion air supply port, 5 ... Gas discharge port, 6
... Slag baffle, 7 ... Slag downflow port, 8, 8a ... Cyclone coal combustion furnace, 10 ... Slag tank, 11 ... Combustion chamber, 12 ... Bypass line, 13 ... Flame, 14 ... Connection duct, 15, 15a ... Vertical type Combustor 16: Char / air / fuel gas inlet, 17, 18, 20, 21 ... Coal inlet, 19 ... Burner, 22 ... Char pre-combustion chamber, 23 ... Coal inlet, 24 ... Coal pre-combustion chamber, 25 ... Intermediate baffle,
26 ... Partition plate, 27 ... O ₂ enriched air passage, 28 ... Swirl vane, 30 ... Char / primary air inlet port, 31 ... Fuel gas pipe

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideki Takano 1 Kawasaki-cho, Chiba-shi, Chiba Inside Kawasaki Steel Co., Ltd. (72) Creator Katsunori Yoshida 1 Kawasaki-cho, Chiba-shi Chiba Steel Co., Ltd. Chiba Steel In-house (56) Reference JP-A-63-172808 (JP, A)

Claims (2)

[Scope of utility model registration request] 1. A cyclone main body (2) for partially burning coal by swirling air inside a side wall of a secondary furnace (1) is attached laterally directly or via a connecting duct (14).
In a cyclone coal combustion furnace in which a gas discharge port (5) for guiding combustion gas to a secondary furnace and a slag downflow port (7) are provided in the cyclone body (2), a vertical pre-combustor is provided at the upper end of the cyclone body (2). (15) is tangentially connected, and the char / air / fuel gas inlet (1
6) and a burner (19) are provided, the coal input port (17) is axially directed at the end of the cyclone body, the coal input port (18) is tangentially directed, and the coal input port is near the gas discharge port (5). (20) or / and a secondary furnace with a coal charging port (2
A cyclone coal combustion apparatus characterized in that 1) is provided. 2. A cyclone body (2) in which coal is partially combusted by swirling air inside is attached to a side wall of a secondary furnace (1) laterally directly or via a connecting duct, and the cyclone body (2) is attached to the cyclone body (2). In a cyclone coal combustion furnace provided with a gas discharge port (5) for guiding combustion gas to a secondary furnace and a slag downflow port (7), a vertical pre-combustor (15a) is tangentially provided at the upper end of the cyclone body (2). The char pre-combustion chamber (22) is formed in the upper part of the vertical pre-combustor by connecting the char, air and fuel gas inlets (16) and the burner (19) at the upper end of the vertical pre-combustor. Further, a coal charging port (23) is tangentially connected to the lower side of the char precombustion chamber to form a coal precombustion chamber (24) below the char precombustion chamber in the vertical precombustor. Cyclone coal combustion device characterized by.