Combustor capable of preventing gas phase white carbon black from hanging

Abstract

The utility model provides an anti-hanging gas phase white carbon black burner which comprises a hydrogen inlet and an air inlet which are formed in one side of a body, and a reaction gas inlet formed in the top end of the body. A first annular flow channel which is communicated with the air inlet and surrounds the second wall of the body is formed between the first wall and the second wall of the body, and a second annular flow channel which is communicated with the hydrogen inlet and surrounds the third wall of the body is formed by the second wall and the third wall of the body. A gas distribution plate is arranged at the bottom of the second annular runner, and a plurality of circulating holes are formed in the gas distribution plate. By the adoption of the technical scheme, the situation that gas-phase white carbon black formed in the initial reaction stage is attached to the wall of the body, and consequently a channel in the combustor is blocked can be avoided, and the purpose of reducing the maintenance and overhaul difficulty of the combustor is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of fumed silica burners, and in particular to an anti-hanging fumed silica burner. Background Art

[0002] At present, the production process of fumed silica requires that air, hydrogen and reaction gases (silicon tetrachloride, trichlorosilane, methylchlorosilane, etc.) be fully mixed through a mixer and then introduced into a reactor for ignition and combustion. Due to uneven gas distribution and the uneven temperature and pressure distribution in the combustion chamber, hydrogen in some areas may not be fully mixed with air and burned, resulting in low combustion efficiency and even the production of harmful by-products.

[0003] In addition, product wall adhesion is a common problem in the production of fumed silica. During the combustion process, the high-temperature product gas easily cools and condenses on the inner wall of the burner, forming a wall adhesion phenomenon, which not only reduces the yield of the product, but also increases the difficulty of cleaning and maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-hanging fumed silica burner, which can achieve uniform distribution of hydrogen and air, avoid the fumed silica formed in the early stage of the reaction from adhering to the wall of the body, thereby preventing the internal channels of the burner from being blocked, thereby improving combustion efficiency and reducing the difficulty of cleaning and maintenance.

[0005] In order to achieve the above-mentioned purpose, the present application provides an anti-hanging gas phase silica burner, comprising: a hydrogen inlet and an air inlet arranged on one side of the body, and a reaction gas inlet arranged at the top of the body; wherein, a first annular flow channel connected to the air inlet and surrounded by the second wall of the body is formed between the first wall of the body and the second wall of the body, and a second annular flow channel connected to the hydrogen inlet and surrounded by the third wall of the body is formed between the second wall of the body and the third wall of the body, and a gas distribution plate is provided at the bottom of the second annular flow channel, and a plurality of flow holes are provided on the gas distribution plate.

[0006] In order to help accelerate the airflow and improve the uniformity of air distribution, as an option of the anti-hanging fumed silica burner of the present application, the width of the bottom outlet end of the first annular flow channel gradually decreases along the airflow direction.

[0007] In order to guide and optimize the outflow of combustion products and reduce eddy currents and wall hanging phenomena, as an option of the anti-hanging gas phase silica burner of the present application, a guide cone is further provided at the air outlet of the main body, and the guide cone is coaxial with the air outlet.

[0008] In order to ensure the stability and easy maintenance of the guide cone, as an option of the anti-hanging gas phase silica burner of the present application, the guide cone is connected to the first wall of the body through a plurality of connecting rod flanges or screws.

[0009] In order to facilitate assembly, disassembly and maintenance of the burner during operation, as an option of the anti-hanging gaseous silica burner of the present application, the first wall of the body and the second wall of the body are connected by a connecting flange or a connecting thread, and the second wall of the body and the third wall of the body are connected by a connecting flange or a connecting thread.

[0010] In order to heat or guide the gas reaction, as an option of the anti-hanging fumed silica burner of the present application, the anti-hanging fumed silica burner further includes a combustion tube integrally formed with the first wall of the body and connected thereto.

[0011] The beneficial effects of this application are:

[0012] The anti-hanging gas-phase silica burner provided by the technical solution of the present application includes: a hydrogen inlet and an air inlet arranged on one side of the body, and a reaction gas inlet arranged at the top of the body. When in use, various gases are pressurized and directly connected from the corresponding inlets and ejected at high speed from the corresponding outlets; wherein, a first annular flow channel formed between the first wall of the body and the second wall of the body is connected to the air inlet and surrounds the second wall of the body, and a second annular flow channel formed between the second wall of the body and the third wall of the body is connected to the hydrogen inlet and surrounds the third wall of the body. The outlet of the first annular flow channel faces the reaction gas outlet on the inner side of the burner body, so that the gas-phase silica formed at the reaction gas outlet cannot adhere to the reaction gas outlet under the gas pressure of the first annular flow channel. On the other hand, since a gas distribution plate is provided at the bottom of the second annular flow channel, and a plurality of flow holes are provided on the gas distribution plate, the gas pressure ejected from the through hole is relatively high, so that the gas-phase silica will not form a wall hanging phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of an anti-hanging fumed silica burner;

[0014] Figure 2 for Figure 1 Schematic diagram of the structure viewed along line AA;

[0015] Figure 3 for Figure 1 Schematic diagram of the structure along the BB line;

[0016] Description of reference numerals:

[0017] 100. The body; 101. The first wall of the body; 102. The second wall of the body; 103. The third wall of the body;

[0018] 200, hydrogen gas inlet;

[0019] 300, air vent;

[0020] 400, reaction gas inlet;

[0021] 500, first annular flow channel;

[0022] 600, second annular flow channel;

[0023] 700, gas distribution plate; 701, flow hole;

[0024] 800, air outlet;

[0025] 900, guide cone;

[0026] 1000, connecting rod;

[0027] 1100. Combustion tube. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0030] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly indicate the quantity, specific order, or primary and secondary relationship of the indicated technical features. The term "several" refers to two or more (including two).

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "set," "provided with," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two elements or interactions between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] The inventor of this application has proposed an anti-hanging fumed silica burner, referring to Figure 1-Figure 3 , Figure 1 A schematic structural diagram of an anti-hanging fumed silica burner provided in an embodiment of the present application; Figure 2 Provided in the embodiments of this application Figure 1 Schematic diagram of the structure viewed along line AA; Figure 3 Provided in the embodiments of this application Figure 1 Schematic diagram of the structure viewed along line BB.

[0034] Reference Figure 1-Figure 3 The anti-hanging gas phase silica burner provided in the present application includes: a hydrogen inlet 200 and an air inlet 300 arranged on one side of the main body 100, and a reaction gas inlet 400 arranged at the top of the main body 100. When in use, various gases are pressurized and directly connected from the corresponding inlets and ejected at high speed from the corresponding gas outlets; wherein, a first annular flow channel 500 formed between the first wall 101 and the second wall 102 of the main body 100 is connected to the air inlet 300 and surrounds the second wall 102 of the main body, and a second annular flow channel 600 formed between the second wall 102 and the third wall 103 of the main body 100 is connected to the hydrogen inlet 200 and surrounds the third wall 103 of the main body. The first annular flow channel 500 and the second annular flow channel 600 ensure that the hydrogen completely surrounds the reaction gas and the air completely surrounds the hydrogen and the reaction gas, thereby achieving the effect of increasing the contact area between the gases.

[0035] Continue to refer to Figure 3As an improvement to the embodiment of the present application, a gas distribution plate 700 is provided at the bottom of the second annular flow channel 600, and a plurality of flow holes 701 are provided on the gas distribution plate 700. When some silane with a lower ignition point is used as a raw material for the reaction, the silane generates part of the gaseous silica during the raw gas mixing stage due to its too low ignition point. However, since the gas distribution plate 700 is provided at the bottom of the second annular flow channel 600, and a plurality of flow holes 701 are provided on the gas distribution plate 700, the uniform distribution of hydrogen is ensured, and the width of the bottom outlet end of the first annular flow channel 500 gradually decreases along the airflow direction, and the outlet of the first annular flow channel 500 faces the reaction gas outlet on the inner side of the burner body, so that the gaseous silica formed at the reaction gas outlet cannot adhere to the reaction gas outlet under the gas pressure of the first annular flow channel 500. On the other hand, since a gas distribution plate 700 is provided at the bottom of the second annular flow channel 600 and a plurality of flow holes 701 are provided on the gas distribution plate 700, the pressure of the gas ejected from the through holes is relatively high, so that the fumed silica will not form a wall hanging phenomenon.

[0036] Continue to refer to Figure 1-Figure 3 In a further embodiment of the present application, a guide cone 900 is further provided at the air outlet 800 of the main body 100, and the guide cone 900 is coaxial with the air outlet 800. During the operation of the anti-hanging vaporized silica burner, the guide cone 900 guides and optimizes the outflow of combustion products, and the anti-hanging vaporized silica burner also includes a combustion tube 1100 integrally formed with the first wall 101 of the main body. Due to the pressurization and flow rate of the gas, the vaporized silica will not form a wall hanging phenomenon, so that the reaction flame will be straighter, thereby ensuring the stability of the burner during use and improving the production efficiency and quality of the vaporized silica.

[0037] Optionally, the guide cone 900 is connected to the first wall 101 of the main body through a plurality of connecting rods 1000 flanges or screws, thereby ensuring that the guide cone 900 is easy to assemble and disassemble, and further improving the maintainability of the burner.

[0038] In a further embodiment of the present application, the first wall 101 of the main body is connected to the second wall 102 of the main body by a connecting flange or a connecting thread, and the second wall 102 of the main body is connected to the third wall 103 of the main body by a connecting flange or a connecting thread, so that the burner is easy to clean and maintain.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-hanging fumed silica burner, characterized in that: include: A hydrogen inlet (200) and an air inlet (300) are provided on one side of the body (100), and a reaction gas inlet (400) is provided on the top of the body (100); Among them, a first annular flow channel (500) is formed between the first wall (101) and the second wall (102) of the body (100), which is connected to the air inlet (300) and surrounds the second wall (102) of the body; a second annular flow channel (600) is formed between the second wall (102) and the third wall (103) of the body (100), which is connected to the hydrogen inlet (200) and surrounds the third wall (103) of the body; and a gas distribution plate (700) is provided at the bottom of the second annular flow channel (600), and a plurality of flow holes (701) are provided on the gas distribution plate (700).

2. The anti-hanging fumed silica burner according to claim 1, characterized in that: The width of the bottom outlet end of the first annular flow channel (500) gradually decreases along the airflow direction.

3. The anti-hanging fumed silica burner according to claim 1, characterized in that: A guide cone (900) is also provided at the air outlet (800) of the body (100), and the guide cone (900) is coaxial with the air outlet (800).

4. The anti-hanging fumed silica burner according to claim 3, characterized in that: The guide cone (900) is connected to the first wall (101) of the main body via a plurality of connecting rods (1000) flanges or screws.

5. The anti-hanging fumed silica burner according to claim 1, characterized in that: The first wall (101) of the main body is connected to the second wall (102) of the main body via a connecting flange or a connecting thread, and the second wall (102) of the main body is connected to the third wall (103) of the main body via a connecting flange or a connecting thread.

6. The anti-hanging fumed silica burner according to claim 5, characterized in that: The anti-hanging fumed silica burner further comprises a combustion tube (1100) integrally formed with the first wall (101) of the main body and connected thereto.

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