CN201302156Y - External combustion type pulverized coal burner which has the characteristics of tiny-oil ignition and ultra-low load stable combustion - Google Patents

Abstract

The utility model discloses an external combustion type pulverized coal burner with micro-oil ignition and ultra-low load stable combustion. Including gradually expanding burner body, blunt body, peripheral air shell, partition, primary air duct, central air duct, thermocouple, micro-oil gun and high-energy ignition gun. The blunt body is used to concentrate the pulverized coal flow, and the concentrated pulverized coal flow is further concentrated when it passes through the triangular groove on the blunt body. A recirculation zone with high concentration of pulverized coal is formed nearby to realize ultra-low load stable combustion and adaptability to a wide range of coal types. Under the condition of cold air and cold furnace, a micro-oil gun can be used to ignite the pulverized coal flow to realize temperature rise and pressure increase, and the wall temperature is used to monitor The position of the ignition point is adjusted by using the central wind and peripheral air volume to meet the requirements of different stages of the boiler.

Description

An external combustion micro-oil ignition and ultra-low load stable combustion pulverized coal burner

technical field

The utility model relates to a pulverized coal burner, in particular to an external combustion type pulverized coal burner with micro-oil ignition and ultra-low load stable combustion.

Background technique

In the field of pulverized coal boiler ignition, there are many pulverized coal burners such as micro-oil, plasma, etc. The common point is to use local high-temperature ignition sources to ignite the pulverized coal flow in stages inside the burner to achieve the purpose of ignition and fuel saving. Since the high temperature point is located inside the burner, on the one hand, the resistance of the burner is increased, and on the other hand, it is easy to cause slagging and burning. This type of burner is quite different from the main burner in terms of structure and function, and it does not have low-load capacity and coal type adaptability without using an auxiliary ignition source.

Contents of the invention

In order to solve the problems in the background technology, the purpose of this utility model is to provide an external combustion type micro-oil ignition and ultra-low load stable combustion pulverized coal burner, and its ignition high temperature point is located at the burner outlet.

The technical scheme that the utility model solves its technical problem adopts is:

The utility model comprises a primary air pipe, a central air pipe, a micro-oil gun, a high-energy ignition gun, a thermocouple, a gradually expanding burner body, a blunt body, a peripheral air shell and a partition; the peripheral air shell is set on the gradually expanding burner The outside of the body is connected with ribs. The small end of the gradually expanding burner body is connected with the primary air duct. The inside of the gradually expanding burner body is arranged with a blunt body. There are a plurality of triangular grooves on the upper and lower sides of the blunt body, and the triangular grooves extend to the small end of the blunt body. The inside of the blunt body is a rectangular central air outlet. Two upper and lower pulverized coal flow passages are formed between the air pipes, a thermocouple is arranged on both sides of the gradually expanding burner body, and a micro-oil gun and a high-energy ignition gun are arranged in parallel in the central air pipe and the central tuyere.

The axial distance C between the end face of the peripheral wind shell and the large end face of the expanding burner body is 80-120 mm.

One end face of the partition is on the same plane as the large end of the blunt body, and the distance B between the other end face of the partition and the end face of the perimeter air casing is 130-170 mm.

The distance A between the large end face of the blunt body and the end face of the perimeter air casing is 230-270 mm.

The beneficial effect that the utility model has is:

The blunt body is used to concentrate the pulverized coal flow, and the concentrated pulverized coal flow is further concentrated when it passes through the triangular groove on the blunt body. A recirculation zone with high concentration of pulverized coal is formed nearby to realize ultra-low load stable combustion and adaptability to a wide range of coal types. Under the condition of cold air and cold furnace, a micro-oil gun can be used to ignite the pulverized coal flow to realize temperature rise and pressure increase, and the wall temperature is used to monitor The position of the ignition point is adjusted by using the central wind and peripheral air volume to meet the requirements of different stages of the boiler.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the utility model.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

In the figure: 1. Primary air duct, 2. Central air duct, 3. Micro oil gun, 4. High-energy ignition gun, 5. Thermocouple, 6. Expanding burner body, 7. Blunt body, 8. Perimeter air shell Body, 9, rib plate, 10, dividing plate, 11, triangular groove, 12, central tuyere.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 and 2, the utility model includes a primary air duct 1, a central air duct 2, a micro-oil gun 3, a high-energy ignition gun 4, a thermocouple 5, a gradually expanding burner body 6, a blunt body 7, and a peripheral air Shell 8 and partition 10; the perimeter air shell 8 is set on the outside of the gradually expanding burner body 6 and connected with eight ribs 9, the small end of the gradually expanding burner body 6 is connected with the primary air pipe 1, gradually The blunt body 7 is arranged inside the expanding burner body 6, and the two outer sides of the large end of the blunt body 7 are symmetrically equipped with partitions 10. The upper and lower ends of the blunt body 7 are respectively provided with a plurality of triangular grooves 11, and the multiple triangular grooves 11 extend to the blunt body. The small end of the blunt body 7 has a rectangular central air outlet 12 inside the blunt body 7. The small end of the blunt body 7 is connected to the central air duct 2 of the primary air duct 1, and two upper and lower coal powders are formed between the central air duct 2 and the primary air duct 1. In the airflow channel, a thermocouple 5 is respectively arranged on both sides of the outer sides of the gradually expanding burner body 6, and a micro-oil gun 3 and a high-energy ignition gun 4 are arranged in parallel in the central air pipe 2 and the central tuyere 12. The right side of the blunt body 7 and the right side of the peripheral air casing 8 form a pre-chamber space.

The axial distance C between the end surface of the peripheral air casing 8 and the large end surface of the expanding burner body 6 is 80-120 mm.

One end face of the partition 10 is on the same plane as the large end of the blunt body 7 , and the distance B between the other end face of the partition 10 and the end face of the peripheral air casing 8 is 130-170 mm.

The distance A between the large end surface of the blunt body 7 and the end surface of the peripheral air casing 8 is 230-270 mm.

The working process of the present utility model is as follows:

In the process of boiler ignition, temperature rise and pressure increase, and low load, the peripheral wind and central wind are closed, and due to the joint action of the blunt body 7 and the two partitions 10, a wide recirculation zone is formed between the blunt body 7 and the two partitions 10 , with good ignition conditions. The pulverized coal airflow flows through the primary air duct 1 to the blunt body 7, and is concentrated on the upper and lower surfaces of the blunt body 7. A part of the concentrated pulverized coal airflow is further partially concentrated when passing through the triangular groove 11 on the blunt body 7, and enters the blunt body. In the reflow area between the body 7 and the two partitions 10, the cross-sectional area on both sides of the large end of the blunt body 7 is smaller than the middle, so that the reflow area of the blunt body 7 is partially closed. The diesel oil produced can ignite the high-concentration pulverized coal flow in the recirculation zone under the condition of cold air and furnace. Generally, the length of the recirculation zone is 400-500mm from the large end of the blunt body 7. After the high-concentration pulverized coal is ignited, part of the recirculation zone is Inside the end face of the perimeter wind housing 8, the amount of heat emitted is less and can reach a very high temperature, while the partition 10 is cooled by the main flow of pulverized coal and will not be burned. As the temperature rises and the pressure rises, the temperature monitored by the thermocouple 5 becomes higher and higher, and the central wind and the peripheral wind can be gradually turned on to gradually eliminate the recirculation zone, so that the temperature monitored by the thermocouple 5 is within an appropriate range. When the boiler is in normal operation, the temperature monitored by thermocouple 5 will change due to the change of coal type and load, and the temperature monitored by thermocouple 5 will be kept within the normal range through the adjustment of central wind and peripheral air volume, so as to Meet different requirements of boilers.

The above-mentioned specific embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the scope of protection of the claims, any modifications and changes made to the utility model fall into the scope of the utility model. scope of protection.

Claims (4)

1, a kind of external-burning tiny-oil ignition and ultra-low load steady-burning coal power combustor is characterized in that: comprise an airduct (1), central air hose (2), little oil gun (3), high-energy firing gun (4), thermocouple (5), gradually expanded form burner body (6), bluff body (7), surrounding air housing (8) and dividing plate (10); Surrounding air housing (8) is enclosed within gradually expanded form burner body (6) outside, be connected with gusset (9), the small end of gradually expanded form burner body (6) links to each other with an airduct (1), gradually expanded form burner body (6) internal placement bluff body (7), bluff body (7) holds two outside symmetries that dividing plate (10) is housed greatly, bluff body (7) holds top and bottom to be respectively equipped with a plurality of vee gutters (11) greatly, a plurality of vee gutters (11) extend to bluff body (7) small end, bluff body (7) inside is air port, rectangular center (12), bluff body (7) small end links to each other with the central air hose (2) of an airduct (1), form two breeze airflow passages up and down between a central air hose (2) and the airduct (1), on both sides, gradually expanded form burner body (6) outside thermocouple (5) is set respectively, little oil gun (3) and high-energy firing gun (4) be arranged in parallel in central air hose (2) and air port, center (12).

2, a kind of external-burning tiny-oil ignition according to claim 1 and ultra-low load steady-burning coal power combustor is characterized in that: described surrounding air housing (8) end face and gradually expanded form burner body (6) large end face axial distance C are 80～120mm.

3, a kind of external-burning tiny-oil ignition according to claim 1 and ultra-low load steady-burning coal power combustor, it is characterized in that: (10) end faces of described dividing plate and bluff body (7) are big to be held at grade, and another end face of dividing plate (10) and surrounding air housing (8) end face distance B are 130～170mm.

4, a kind of external-burning tiny-oil ignition according to claim 1 and ultra-low load steady-burning coal power combustor is characterized in that: described bluff body (7) large end face and surrounding air housing (8) end face distance A are 230～270mm.

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