CN201137936Y - Swirl Pulverized Coal Burner - Google Patents

Abstract

The utility model discloses a swirl pulverized coal burner, which comprises a primary air elbow (1), an oil gun sleeve (9) located in the center of the straight section of the primary air elbow (1), and a direct current secondary air channel ( 7), the swirling secondary air channel (8) and the flame stabilizing ring (6) with combustion stabilizing teeth located at the end of the primary air elbow (1) near the furnace side, also includes the primary air elbow (1) The radian in the curved part is adapted to the curved part of the primary air elbow (1). The utility model is a swirl pulverized coal combustion device with significantly reduced wear, and also has the functions of rapid ignition, stable combustion, low NOX emission and the like.

Description

Swirl Pulverized Coal Burner

technical field

The utility model relates to a burner, in particular to a burner using pulverized coal as fuel.

Background technique

Since the beginning of this century, all boiler factories in my country have mastered the technology of large-capacity, high-parameter super (super) critical power plant boilers through the introduction of foreign advanced technology. Through the marketization and industrialization of these technologies, a large number of modern large-scale power plant boilers with high efficiency and low pollutant emissions have been built in my country, which has made great contributions to alleviating the tension in power supply in the previous stage and promoting the development of my country's electric power industry.

However, with the increasingly scarce supply of coal for power use in my country, the actual coal quality of the boiler is often quite different from the design coal quality, which not only greatly increases the wear of the burner, but also makes the stable combustion capacity of the boiler less than the design. Requirements, slow ignition speed, high NOX emissions. This will not only seriously affect the performance and efficiency of the boiler, but also shorten the maintenance cycle of the power plant, increase the cost of operation, and affect the economy of operation. Therefore, how to combine the imported advanced technology with the current situation of changing coal quality in domestic power plants, and continuously optimize and invent burner products that are more suitable for domestic coal quality that is difficult to ignite, difficult to stabilize and easy to wear, has become a major boiler manufacturer and manufacturer. The urgent need of power plants has realistic social significance and practical value.

Contents of the invention

The utility model mainly solves the technical problem of large burner wear in the prior art, and provides a swirl pulverized coal burner which can effectively reduce wear.

The utility model also solves the technical problems of the swirl pulverized coal burner in the prior art, such as weak combustion stability, slow ignition speed, and high NOX emission, and provides a fast ignition speed, strong combustion stability, and low NOX emission. swirl pulverized coal burner.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: including the primary air elbow, the oil gun sleeve located in the center of the straight section of the primary air elbow, the direct current secondary air channel, the swirl secondary air The channel and the flame stabilizing ring with combustion stabilizing teeth located at the end of the primary air elbow near the furnace side also include a flow equalizer located in the curved part of the primary air elbow with a radian adapted to the curved part of the primary air elbow.

As a preference, a diffuser cone is provided along the centerline on the straight section of the primary air elbow, and the diffuser cone is a flared sleeve with a large opening facing the furnace side.

Preferably, the equalizer plate deviates a certain distance away from the furnace at the inlet end of the primary air elbow.

As a preference, the oil gun casing is arranged as a pulverized coal concentrator 5 at one end close to the furnace, and the pulverized coal concentrator is shaped as two ends flared, and the middle is cylindrical.

Preferably, the flare angle α of the diffuser cone is 20°-45°.

Preferably, the equalizer plate deviates a certain distance away from the furnace at the inlet end of the primary air elbow.

Therefore, the utility model has the characteristics of reasonable structure and convenient use, especially after the equalizer plate is arranged in the primary air elbow of the burner, the coal powder entering the primary air channel entrance is divided into upper and lower parts, reducing the coal powder The amount of pulverized coal acting on the inner wall of the primary air passage due to inertia effectively reduces the wear of the primary air passage. By setting the diffuser cone, the pulverized coal will concentrate outward after flowing through the diffuser cone, forming a distribution structure of pulverized coal that is thick on the outside and light on the inside. By setting the tail of the oil gun sleeve as a pulverized coal concentrator, the After the pulverized coal passes through the pulverized coal concentrator, the structure of the pulverized coal is further strengthened. In this way, a high-temperature recirculation zone is generated near the flame-stabilizing ring, and the shape of the flame and the mixing time of the primary and secondary air are controlled by the air volume ratio of the direct-current secondary air and the swirling secondary air, so as to achieve rapid ignition, stable combustion and low temperature. NOx emissions.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the utility model;

Accompanying drawing 2 is another kind of structural representation of the utility model;

Accompanying drawing 3 is the third structural representation of the utility model;

Detailed ways

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment 1: Referring to Fig. 1, this embodiment includes a primary air elbow 1, an oil gun casing 9 located in the center of the straight section of the primary air elbow 1, a DC secondary air channel 7, a swirl secondary air channel 8 and The flame stabilizing ring 6 with combustion stabilizing teeth located at the end of the primary air elbow 1 on the side of the furnace also includes a flow equalizer located in the curved part of the primary air elbow 1 whose arc is compatible with the curved part of the primary air elbow 1 2. The setting position of the equalizing plate 2 deviates a certain distance from the center of the primary air elbow 1 to the side away from the boiler. Because the flow equalizer 2 is set at the entrance of the primary air passage 4, the pulverized coal entering the entrance of the primary air passage 4 is divided into upper and lower parts. A certain distance on one side of the boiler makes the pulverized coal entering the upper part less than the pulverized coal entering the lower part, which more effectively reduces the wear on the primary air passage and increases the service life of the burner.

Embodiment 2: Referring to Fig. 2, this embodiment includes a primary air elbow 1, an oil gun casing 9 located in the center of the straight section of the primary air elbow 1, a DC secondary air channel 7, a swirling secondary air channel 8 and The flame stabilizing ring 6 with combustion stabilizing teeth located at the end of the primary air elbow 1 on the side of the furnace also includes a flow equalizer located in the curved part of the primary air elbow 1 whose arc is compatible with the curved part of the primary air elbow 1 2. The setting position of the equalizing plate 2 deviates a certain distance from the center of the primary air elbow 1 to the side away from the boiler. Because the flow equalizer 2 is set at the entrance of the primary air passage 4, the pulverized coal entering the entrance of the primary air passage 4 is divided into upper and lower parts. A certain distance on one side of the boiler makes the pulverized coal entering the upper part less than the pulverized coal entering the lower part, which more effectively reduces the wear on the primary air passage and increases the service life of the burner. The straight part of the primary air elbow 1 is provided with a diverging cone 3 along the center line. The diverging cone 3 is a flaring sleeve with a large mouth facing the furnace side. The flaring angle α of the diverging cone 3 is 20°. Due to the installation of the diffuser cone 3, the pulverized coal passing through the diffuser cone 3 is distributed more uniformly in the radial direction. At the same time, because the inertia of the coal powder particles is larger than that of the air, after passing through the diffuser cone 3, the pulverized coal will concentrate outward A pulverized coal distribution structure with thick outside and light inside is formed.

When this embodiment is in use, a high-temperature recirculation zone will be generated near the flame-stabilizing ring 6 at the nozzle of the oil gun, and the air volume ratio of the direct current secondary air and the swirling secondary air will be controlled by the regulating device, and the shape and shape of the flame will be controlled. The mixing time of primary and secondary air achieves rapid ignition, stable combustion and low NOX emissions.

Embodiment 3: Referring to Fig. 3, this embodiment includes a primary air elbow 1, an oil gun casing 9 located in the center of the straight section of the primary air elbow 1, a DC secondary air channel 7, a swirling secondary air channel 8 and The flame stabilizing ring 6 with combustion stabilizing teeth located at the end of the primary air elbow 1 on the side of the furnace also includes a flow equalizer located in the curved part of the primary air elbow 1 whose arc is compatible with the curved part of the primary air elbow 1 2. The setting position of the equalizing plate 2 deviates a certain distance from the center of the primary air elbow 1 to the side away from the boiler. Because the flow equalizer 2 is set at the entrance of the primary air passage 4, the pulverized coal entering the entrance of the primary air passage 4 is divided into upper and lower parts. A certain distance on one side of the boiler makes the pulverized coal entering the upper part less than the pulverized coal entering the lower part, which more effectively reduces the wear on the primary air passage and increases the service life of the burner. The straight part of the primary air elbow 1 is provided with a diverging cone 3 along the center line. The diverging cone 3 is a flaring sleeve with a large mouth facing the furnace side. The flaring angle α of the diverging cone 3 is 45°. Due to the installation of the diffuser cone 3, the pulverized coal passing through the diffuser cone 3 is distributed more uniformly in the radial direction. At the same time, because the inertia of the coal powder particles is larger than that of the air, after passing through the diffuser cone 3, the pulverized coal will concentrate outward A pulverized coal distribution structure with thick outside and light inside is formed. The oil gun sleeve pipe 9 is arranged as a pulverized coal concentrator 5 at one end near the furnace, and the pulverized coal concentrator 5 is shaped as two ends flared, and the middle is cylindrical. After the pulverized coal concentrator 5 is installed, the pulverized coal airflow passes through the pulverized coal concentrator 5, further strengthening the distribution structure of pulverized coal that is thicker on the outside and weaker on the inside.

When this embodiment is in use, a high-temperature recirculation zone will be generated near the flame-stabilizing ring 6 at the nozzle of the oil gun, and the air volume ratio of the direct current secondary air and the swirling secondary air will be controlled by the regulating device, and the shape and shape of the flame will be controlled. The mixing time of primary and secondary air achieves rapid ignition, stable combustion and low NOX emissions.

The utility model is mainly suitable as a burner for large and medium-sized coal-fired boilers. Many parameters in the utility model, such as the flaring angle of the flow diverter cone, the flaring angles of both sides of the pulverized coal concentrator, etc., can be changed, and corresponding adjustments can be made to different coal types and working conditions. Such changes all fall within the protection scope of the present utility model.

Claims (6)

1. a swirl pulverized coal burner, comprising a primary air elbow (1), an oil gun casing (9) positioned at the center of the straight part of the primary air elbow (1), a direct-current secondary air passage (7) ), the swirling secondary air channel (8) and the flame stabilizing ring (6) with combustion stabilizing teeth located at the end of the primary air elbow (1) on one side of the furnace, is characterized in that: it also includes a A flow equalizer (2) whose radian in the curved portion of the primary air elbow (1) is adapted to the curved portion of the primary air elbow (1). 2. The swirl pulverized coal burner according to claim 1, characterized in that: a diffuser cone (3) is arranged along the center line on the straight section of the primary air elbow (1), and the diffuser The flow cone (3) is a flaring sleeve, and the big mouth is towards the furnace side. 3. The swirl pulverized coal burner according to claim 1 or 2, characterized in that: said equalizer plate (2) deviates by a certain amount at the inlet end of said primary air elbow (1) to the side away from the furnace distance. 4. The swirl pulverized coal burner according to claim 1 or 2, characterized in that: the oil gun casing (9) is set as a pulverized coal concentrator (5) at one end near the furnace, and the pulverized coal The shape of the concentrator (5) is flared at both ends, and the middle is cylindrical. 5. The swirl pulverized coal burner according to claim 2, characterized in that: the flare angle α of the diffuser cone (3) is 20°-45°. 6 . The swirl pulverized coal burner according to claim 4 , characterized in that: said equalizer plate ( 2 ) deviates a certain distance away from the furnace at the inlet end of said primary air elbow ( 1 ).

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