Primary air nozzle of combustor

Abstract

The utility model provides a burner primary air nozzle which comprises an independently formed nozzle body and transverse partition plates, the transverse partition plates are detachably installed in the nozzle body, and at least one transverse partition plate is installed in the nozzle body. According to the silicon carbide primary air nozzle, the nozzle body and the transverse partition plate are respectively formed and then assembled, and when a single product is damaged, the single product can be replaced, so that the service life of the silicon carbide primary air nozzle can be remarkably prolonged, and the material replacement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a primary air nozzle of a burner. Background Art

[0002] Burners are core components of boilers, a key component of thermal power generation. Their operation directly impacts the boiler's performance and even safety. Burners operate in harsh environments, enduring the radiation of high-temperature flue gases and the intense erosion of pulverized coal airflow. Burners are fragile devices. Deformation or damage to the burner can deteriorate combustion, negatively impacting boiler operation.

[0003] Direct-flow pulverized coal burners, employing a four-corner tangential combustion method, are widely used in thermal power plants. Most of these burners' primary air nozzles are manufactured from castings. However, these castings are prone to deformation at high temperatures and wear under the intense impact of the pulverized coal airflow, resulting in a short service life. Because silicon carbide offers superior high-temperature and wear resistance compared to metal, it is increasingly being adopted by major domestic thermal power equipment manufacturers as a replacement for cast primary air nozzles.

[0004] However, ceramic products generally have poor thermal stability due to their high hardness. Compared with metal products, they are more prone to shattering due to thermal stress. This type of silicon carbide integrally molded primary air nozzle is large in size and complex in structure. The environmental conditions before and after operation vary greatly inside and outside. Therefore, the temperature difference between different parts is large under hot conditions, which generates large thermal stress in the nozzle. In addition, the burner is prone to coking due to various reasons. Coking will cause differences in thermal conductivity between different parts, thereby increasing the temperature difference between different parts and increasing the thermal stress in the nozzle. Therefore, burners using silicon carbide integrally molded primary air nozzles have the problem of cracking or even breaking and falling off of the primary air nozzles shortly after operation. In particular, the problem of breaking and falling off of the diaphragm inside the nozzle is more prominent, affecting the normal operation of the boiler and worsening combustion. At the same time, due to the integral molding, when the diaphragm breaks, the entire nozzle needs to be replaced, which increases the cost expenditure and users have a strong reaction. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a burner primary air nozzle, which can significantly improve the service life of the silicon carbide primary air nozzle by assembling the structure after separately forming.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a burner primary air nozzle, comprising an independently formed nozzle body and a diaphragm, wherein the diaphragm is detachably installed inside the nozzle body, and at least one diaphragm is installed in the nozzle body.

[0007] Furthermore, the diaphragm is installed in the nozzle body by means of positioning pins.

[0008] Furthermore, a plurality of partition connecting members are fixedly installed inside the nozzle body, and each partition connecting member is provided with a connecting member positioning pin hole. Meanwhile, corresponding partition positioning pin holes are provided on the transverse partition.

[0009] Furthermore, a plurality of guide grooves are provided inside the nozzle body.

[0010] Furthermore, the partition connecting piece is fixedly installed in the nozzle body by welding.

[0011] Furthermore, the partition connecting piece forms an angle a with the surface of the nozzle body, and the angle a is 60°-90°.

[0012] Furthermore, the diaphragm and the nozzle body are both made of silicon carbide material, and the diaphragm connecting piece is made of silicon carbide or metal.

[0013] Furthermore, triangular stabilizing frames are provided at the four corners of the nozzle body.

[0014] As described above, the primary air nozzle of a burner of the utility model has the following beneficial effects:

[0015] 1. The nozzle body and the diaphragm are formed separately and then assembled. When a single product is damaged, it can be replaced, which can significantly increase the service life of the silicon carbide primary air nozzle and reduce the cost of replacing materials.

[0016] 2. The nozzle body and the diaphragm are connected by a positioning pin structure, which is convenient for assembly and disassembly. When the product is damaged, it can be replaced separately on site, avoiding the need to return to the factory for repair or direct disposal of the product, thereby improving the efficiency of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the nozzle described in Example 1 of this application.

[0018] Figure 2 This is a schematic diagram of the structure of the nozzle described in Example 2 of this application.

[0019] Figure 3 This is a schematic diagram of the structure of the nozzle described in Example 3 of this application.

[0020] In the figure: 1, front part, 2, rear part, 3, triangular stabilizer, 4 / 4', cross partition, 5, positioning pin, 6 / 6', partition connector, 7, connector positioning pin hole, 8, guide groove. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] See also Figures 1 to 3 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0023] Example 1:

[0024] like Figure 1 As shown, this embodiment provides a burner primary air nozzle, including an independently formed nozzle body and a transverse partition 4, wherein the nozzle body includes an integrally formed rear portion 2 and a front portion 1, the side projection of the rear portion 2 is trapezoidal, and the side projection of the front portion 1 is rectangular, a space is provided inside the nozzle body, and triangular stabilizing frames 3 are provided at the four corners of the nozzle body to improve the strength of the entire nozzle body, and the triangular fixing frame is integrally formed with the nozzle body or welded.

[0025] The transverse partition 4 is rectangular and detachably installed in the internal space of the nozzle body, and at least one transverse partition 4 is installed in the nozzle body. In this embodiment, in order to facilitate viewing of the drawings, only one transverse partition 4 is installed.

[0026] In this embodiment, the diaphragm 4 is detachably mounted in the nozzle body by means of positioning pins 5 or bolts. In this embodiment, the diaphragm 4 is mounted in the internal space of the nozzle body by means of positioning pins 5 .

[0027] Specifically, a plurality of baffle connectors 6 are fixedly installed inside the front portion 1 of the nozzle body. In this embodiment, six baffle connectors 6 are installed. The baffle connectors 6 are arranged perpendicular to the inner surface of the nozzle body.

[0028] Two partition connectors 6 are provided for each transverse partition 4, and each partition connector 6 is provided with a connector positioning pin hole 7. At the same time, the transverse partition 4 is provided with partition positioning pin holes of corresponding positions and the same number. During installation, the connector positioning pin holes 7 and the partition positioning pin holes are aligned, and then the partition connector 6 and the transverse partition 4 are positioned by inserting the positioning pins 5, so that the transverse partition 4 is installed inside the nozzle body.

[0029] The partition connecting member 6 is fixedly installed in the nozzle body by welding.

[0030] Furthermore, the transverse partition 4 and the nozzle body are both made of silicon carbide material, and the partition connector 6 is made of silicon carbide or metal. In this embodiment, it is also made of silicon carbide material.

[0031] Example 2:

[0032] See also Figure 2 As shown, a plurality of guide grooves 8 are provided inside the front portion 1 of the nozzle body. In this embodiment, three guide grooves 8 are provided, and the guide grooves 8 are located on one side of the partition connecting member 6. At the same time, the width of the guide groove 8 is the same as the width of the diaphragm 4, but the length is greater than the length of the diaphragm 4. In this embodiment, the height of the diaphragm 4 is greater than the height of the diaphragm 4 in the first embodiment.

[0033] When installing the diaphragm 4 in this embodiment, the diaphragm 4 slides into the nozzle body through the guide groove 8 and is then positioned by the positioning pin 5. The setting of the guide groove 8 can further stabilize the placement of the diaphragm 4 and, at the same time, can also quickly position the diaphragm 4.

[0034] Example 3:

[0035] like Figure 3 As shown, in this embodiment, the partition connector 6' forms an angle a with the nozzle body surface as required, and the angle a is 60°, so that the partition 4' can be installed obliquely according to the requirements of use, which facilitates the use of the burner primary air nozzle.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A primary air nozzle of a burner, characterized in that: The nozzle body comprises an independently formed nozzle body and a transverse partition, wherein the transverse partition is detachably installed inside the nozzle body, and at least one transverse partition is installed inside the nozzle body.

2. A burner primary air nozzle according to claim 1, characterized in that: The diaphragm is installed in the nozzle body by means of positioning pins.

3. The primary air nozzle of a burner according to claim 2, characterized in that: A plurality of partition connecting members are fixedly installed inside the nozzle body, and each partition connecting member is provided with a connecting member positioning pin hole. Meanwhile, corresponding partition positioning pin holes are provided on the transverse partition.

4. A burner primary air nozzle according to claim 3, characterized in that: A plurality of guide grooves are provided inside the nozzle body.

5. The primary air nozzle of a burner according to claim 3, characterized in that: The partition connecting piece is fixedly installed in the nozzle body by welding.

6. The primary air nozzle of a burner according to claim 3, characterized in that: The partition connecting piece forms an angle a with the surface of the nozzle body, and the angle a is 60°-90°.

7. The primary air nozzle of a burner according to claim 3, characterized in that: The transverse diaphragm and the nozzle body are both made of silicon carbide material, and the diaphragm connecting piece is made of silicon carbide.

8. The primary air nozzle of a burner according to claim 1, characterized in that: Triangular stabilizing frames are provided at the four corners of the nozzle body.

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