JPH0241444Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a cooling structure for a burner spreader suitable for use in a burner device in boiler equipment using powdered fuel such as fine powder pitch.

[Conventional technology]

Conventionally, the burner equipment installed in the boiler furnace of boiler equipment that uses pulverized powder pitch or pulverized coal as fuel is
Equipped with a burner nozzle on the outer periphery and a burner spreader on the center side, a mixed fluid of fuel and air is discharged from an annular flow path formed between the two, and is diffused and combusted by a spreader fin provided on the outer periphery of the tip of the spreader. I try to let them do it. In such a burner device, the tip of the burner spreader is directly exposed to the boiler furnace and receives radiant heat, so consideration must be given to prevent burnout of the spreader fin that gives the fuel a swell, and to prevent adhesion due to softening of the fuel pitch. No. For this reason, conventional methods have been to use a heat-resistant material at the tip of the spreader or to provide water cooling.

[Problem that the invention attempts to solve]

However, in the conventional burner spreader water cooling structure, water is cooled only to the spreader tube, and the spreader fins are made of heat-resistant material, or they have a parallel flow structure in which cooling water flows through all the spreader fins at the same time. The former requires the use of expensive heat-resistant materials and has the problem of not being able to avoid carbon adhesion, while the latter creates air pockets in the fins, resulting in localized high temperatures and similar problems of carbon adhesion and thermal fatigue cracking due to steam. Ta.

[Means for solving problems]

The present invention focuses on the above-mentioned conventional problems, and aims to provide a cooling structure for a burner spreader that can systematically circulate cooling water to the tip including the spreader fins to prevent stagnation and improve cooling efficiency. It is something.

In order to achieve the above object, the burner spreader cooling structure according to the present invention forms a cooling water introduction chamber in the tip wall of the spreader tube for a burner spreader having a plurality of spreader fins on the outer periphery of the tip of the spreader tube. At the same time, this introduction chamber is divided in the circumferential direction by the number of sprets duff fins to form rooms, and the sprets duff fin is provided with a cooling water circulation chamber therein, and this circulation chamber is communicated with each of the pair of adjacent divided chambers. and a cooling water supply port and a cooling water discharge port are separately formed in at least one divided chamber.

[Effect]

With the above configuration, the cooling water supplied to the cooling water introduction chamber at the tip of the spreader enters one intra-fin flow chamber from one divided chamber and flows to the adjacent divided chamber, which sequentially cools each fin in the cooling circumferential direction. It flows in series and is taken out of the system from the exhaust port. As a result, the cooling water systematically flows through each fin in series, resulting in a structure in which stagnation is less likely to occur, and air pockets are not generated and thermal fatigue cracking can be prevented. As a result, the cooling efficiency increases, so that it can be used satisfactorily without using heat-resistant materials.

[Example of idea]

Embodiments of the burner spreader cooling structure according to the present invention will be described in detail below with reference to FIGS. 1 to 6.

FIG. 6 is a sectional view showing the overall structure of a burner device equipped with a burner spreader having a water-cooled structure according to the embodiment. A burner 16 is provided which penetrates the formed secondary air supply window box 14 and has its tip facing the combustion port 12 (FIG. 4). The burner 16 is formed in a double tube structure, with a burner spreader 18 on the inner tube side and a burner nozzle 20 on the outer tube side. A fuel supply section 22 is provided on the outer peripheral surface of the burner spreader 20 located at the rear end of the burner nozzle 20, and serves as a fuel port for mixing fine powder pitch and primary air, for example, and is an annular passage between the burner spreader 18 and the burner nozzle 20. through the spretsuda fin 28 on the outer periphery of the spretsuda tip to the furnace 1.
The fuel is injected within 0.

Here, the burner spreader 18 inserted into the burner nozzle 20 is composed of a spreader tube 26 and a plurality of spreader fins 28 (eight in the embodiment) provided on the outer periphery of the tip thereof. A cooling water channel 30 is formed within the wall. spretsuda tube 2
Reference numeral 6 is a double tube consisting of an outer wall tube 32 and an inner wall tube 34 to form a cooling water channel 30, and the tip thereof is closed. The cooling water channel 30 at the tip, which corresponds to the installation width of the spreader fin 28, is divided into front and rear sections by a ring-shaped partition plate 36 provided at the rear edge of the fin, and the space at the tip is used as a cooling water introduction chamber 38. This cooling water introduction chamber 38 is further divided into 8 chambers corresponding to the number of fins 28 along the circumferential direction, and is divided into 8 chambers by partition walls 40 arranged radially.
A divided chamber 42 of the chamber is formed. On the other hand, divided room 4
Each spread fin 28 located on the outer periphery of the fin 28 is curved in an arc shape so as to span a pair of adjacent divided chambers 42, and as shown in FIG. The wing axis line is aligned with the partition wall 4 so that the root portion corresponds to the adjacent divided chamber 42.
It is crossed with 0. The spreader fin 28 has a cooling water flow chamber 44 formed therein, and a buffer 46 is provided therein so that the cooling water flows along the periphery of the fin 28. and,
A communication supply port 48 between the divided chamber 42 and the flow chamber 44 is formed in the outer tube wall 32 corresponding to the root of the front edge of the fin, and an adjacent divided chamber 42 is formed in the outer tube wall 32 corresponding to the root of the rear edge of the fin. A communication port 50 is formed between the flow chamber 44 and the flow chamber 44 . The flow chamber 44 and each divided chamber 42 in each spread fin 28 are formed as described above, so when cooling water is supplied under pressure to one divided chamber 42, it flows into the flow chamber 44 of the corresponding spread fin 28. After that, the flow flows into the adjacent divided chamber 42,
It then flows into the adjacent Spretsu Duffin 28,
Cooling water circulates in series in the circumferential direction.

Here, among the plurality of divided chambers 42, a pair of divided chambers 42A facing each other by 180 degrees each has a cooling water supply port 52 and a cooling water discharge port 54 that are separately opened. As shown in FIG. 5, the front edge of one adjacent fin 28 and the other fin 2
The root part corresponds to the rear edge part of 8, and the communication supply port 48
Since the communication outlet 50 is open, the interior of the divided chamber 42A is separated by an L-shaped separation wall 56 so that the supply port 48 and the outlet 50 communicate independently. A supply separation chamber 58 communicating with the supply port 48 and a discharge separation chamber 60 communicating with the outlet 50 are formed. And partition plate 3
6 has a cooling water supply port 5 that opens into the supply separation chamber 58.
2, and a cooling water discharge port 5 that opens into the discharge separation chamber 60.
4 was established. The cooling water supply port 52 and the discharge port 54 face the cooling water channel 30 in the spreader tube 26 which is partitioned by the partition plate 36. In particular, the cooling water supply port 52 is connected to the cooling water supply pipe 6.
2 is connected, and this cooling water supply pipe 62 passes through the inside of the cooling water channel 30 and is connected to the spret tube 26.
The system reaches the rear end of the system, obtains cooling water from a source outside the system, and supplies it under pressure. One cooling water outlet 54 is for simply leading out the cooling water into the cooling water channel 26 , and the cooling water in the cooling water channel 30 is also discharged from the water channel 30 at the rear end side of the spret tube 26 .
It is discharged outside the system through a discharge pipe connected to the

In addition, in this embodiment, the spray tube 26
For this reason, as shown in FIG. 1, a joint ring 64 is provided on the dividing surface of the tube 26, and a pair of joint rings 64 connected to the cooling water supply pipe 62 are provided on the dividing surface of the tube 26, as shown in FIG. supply passage 66
and two pairs of discharge passages 68 are provided. The tube body side has the same configuration, and the positioning pin 7
Position the joint nuts 72 to each other at 0.
(See Figure 6).

According to the water cooling structure of the burner spreader 18 configured as described above, cooling water is supplied to the cooling water introduction chamber 38 provided at the tip of the spreader tube 26 through the supply pipe 62. The supply pipe 62 is connected to the introduction chamber 3
The supply separation chamber 5 in the pair of division chambers 42A in 8
8, the cooling water flows from the separation chamber 58 through the communication supply port 48 to the communication chamber 44 in the spatter fin 28, and flows inside the fin 28 from the front edge to the upper edge to the rear edge in this order. It circulates and flows into the adjacent divided chamber 42 via the communication outlet 50. Next, while sequentially cooling the adjacent spretz fins 28,
The discharge separation chamber 6 of the divided chamber 42A is passed through the fins 28 (see the white arrows in FIG. 2) and is 180 degrees opposite to the
0, and the cooling water is led out from the cooling water outlet 54 of the partition plate 36 to the cooling water channel 26.

Therefore, according to this embodiment, the cooling water flows in series in the circumferential direction while passing through the divided chamber 42 in the spreader tube 26 and the communication chamber 44 in the spreader fin 28, and the cooling water There is no accumulation of water, and no air pockets are formed within the fins 28. Therefore, there is no need to use a heat-resistant material at the tip of the spreader 18, and carbon adhesion due to flame radiation can be prevented.
Furthermore, since the flow of cooling water is systematic, there is no stagnation, and no thermal fatigue cracks occur due to poor circulation. Furthermore, there is the advantage that even fuel with a low softening point can be used regardless of the effects of radiation in the furnace or the temperature of the combustion air.

In the above embodiment, the divided chamber 42A provided with the cooling water supply port 52 and the discharge port 54 is provided in two locations, but it is also possible to provide the divided chamber 42A in one location or three locations. It can be set arbitrarily so that it can be applied.

[Effect of idea]

As described above, according to the present invention, it is possible to systematically flow cooling water through the tip of the burner spreader and the spreader fins on the outer periphery, thereby preventing stagnation and air pockets, thereby improving cooling efficiency and preventing poor circulation. It has the excellent effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a burner spreader having a water-cooled structure according to an embodiment, FIG. 2 is a cross-sectional view taken along the line - -, FIG.
5 is a developed cross-sectional view taken along the line V-V in FIG. 2, and FIG. 6 is a cross-sectional view of the entire structure of the burner device. 10... Boiler furnace, 18... Burner spreader, 20... Burner nozzle, 26... Spretz tube, 28... Spretzer fin, 30...
Cooling water channel, 36... Partition plate, 38... Cooling water introduction chamber, 40... Partition wall, 42, 42A... Division chamber, 4
4... Communication chamber, 48... Communication supply port, 50... Communication outlet, 52... Cooling water supply port, 54... Cooling water outlet, 56... Separation wall, 58... Supply separation chamber,
60...Discharge separation chamber, 62...Cooling water supply pipe.

Claims (1)

[Scope of utility model registration request] For a burner spreader having a plurality of sprets fins on the outer periphery of the tip of the spretsuda tube, a cooling water introduction chamber is formed in the tip wall of the spretsuda tube, and this introduction chamber is divided in the circumferential direction by the number of sprets duff fins to form rooms. , the sprate fin is provided with a cooling water circulation chamber therein, and this circulation chamber is communicated with each of the pair of adjacent divided chambers, and at least one of the divided chambers is provided with a cooling water supply port and a cooling water discharge port. The water-cooled structure of the Vernaspreader is characterized by its separate formation.