Combustor

Abstract

The utility model relates to a combustor, in particular to a combustor. The device is composed of an oxygen bin, a hydrogen bin, a discharging pipe and a lamp shell, a material keeping pipe and the discharging pipe are installed in the center of the oxygen bin in a penetrating mode, a partition plate is arranged at the lower end opening of the oxygen bin in a sealed mode, a plurality of oxygen combustion pipes communicated with the oxygen bin are annularly arranged on the partition plate in a stacked mode, and the outer circumference of the oxygen bin is sleeved with the hydrogen bin. The lower ports of the oxygen combustion pipe, the material retaining pipe and the discharging pipe are flush with one another, the lower ports of the oxygen combustion pipe, the material retaining pipe and the discharging pipe and the lower port of the hydrogen bin are arranged in a high-low staggered mode, the periphery of the outer surface of the hydrogen bin is sleeved with a lamp shell, and the lower port of the lamp shell is in a blocked shape. Purging pipes are evenly distributed on the circumference of the lower end opening of the plugged lamp shell in the radial direction of 60 degrees. The problems that in an existing hearth, vortex rewinding is prone to adhesion of flying materials, small bubbles are prone to being generated on the surface of a quartz ingot due to falling of the flying materials, or the whole piece of quartz glass is damaged due to the fact that the whole piece of flying materials falls on the material surface are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a burner belongs to quartz glass production instrument technical field. BACKGROUND

[0002] Quartz glass has excellent high temperature resistance and anti-radiation characteristics, extremely low thermal expansion coefficient, good chemical stability, excellent optical uniformity and spectral transmittance, etc., is a key basic material in high-tech field, is widely used in electronic information, aerospace, energy, semiconductor, communication and other industries.

[0003] At present, the main preparation of large aperture optical grade quartz glass is chemical vapor deposition technology, the method is: hydrogen, oxygen, SiCl4 are passed into the burner (hydrogen oxygen burner) together, wherein hydrogen and oxygen are first burned to form high temperature flame, then SiCl4 reacts in the flame and generates SiO2, SiO2 further nucleates and grows into nanoparticles, finally the particles are deposited to form quartz glass ingot.

[0004] In the process of synthesizing fused quartz glass by using chemical vapor deposition technology, due to the vortex backflow in the hearth, the furnace wall, the furnace top and even the burner shell are easy to stick to the flying material, and with the increase of melting time, part of the flying material will fall on the material surface to produce small bubbles on the surface of quartz ingot, thereby affecting the quality of fused quartz glass; When it is serious, the flying material accumulates too much, and the whole block falls on the material surface, resulting in the damage of the whole block of quartz glass. Therefore, in order to realize long time stable production of high quality glass quartz ingot, it is necessary to stop the flying material from sticking to the furnace top and the burner along the flow field. SUMMARY

[0005] The utility model discloses a kind of burners with purging function, to guide most vortex gas in hearth along furnace wall to suction port, thereby reduce the residence time of flying material in hearth, solve vortex backflow in the hearth in the above background technology Easy to stick to flying material, flying material drop makes quartz ingot surface easy to produce small bubbles or flying material whole block falls on material surface and leads to the damage of whole block of quartz glass problem.

[0006] The technical scheme of the utility model is:

[0007] A burner is composed of an oxygen tank, a hydrogen tank, a lower feeding pipe and a lamp shell, characterized in that: a material preserving pipe and a lower feeding pipe are installed through the central part of the oxygen tank, a partition plate is sealingly arranged at the lower end of the oxygen tank, a plurality of oxygen combustion pipes in communication with the oxygen tank are arranged in an annular stack on the partition plate, the hydrogen tank is sleeved on the outer circumference of the oxygen tank, the lower ends of the oxygen combustion pipe, the material preserving pipe and the lower feeding pipe are arranged in a flush manner, the lower ends of the oxygen combustion pipe, the material preserving pipe and the lower feeding pipe and the lower end of the hydrogen tank are arranged in a staggered manner, the lamp shell is sleeved on the outer circumference of the hydrogen tank, the lower end of the lamp shell is in a plugging state, and the plugging lamp shell lower end is circumferentially and radially distributed with a blowing pipe at an angle of 60 degrees.

[0008] A blowing cavity is arranged between the lamp shell and the hydrogen tank, the blowing cavity is in communication with the blowing pipe, and the blowing cavity is in communication with an oxygen source through a communication pipe.

[0009] The lower feeding pipe, the material preserving pipe, the oxygen tank and the hydrogen tank are sealingly arranged with each other.

[0010] Oxygen communication pipes are arranged on the oxygen tank and the material preserving pipe respectively, and the oxygen communication pipes are in communication with an oxygen source.

[0011] The beneficial effects of the utility model compared with the prior art are that:

[0012] The burner blows out high-purity oxygen from the blowing pipe in the hearth through the blowing cavity, thereby guiding most of the eddy current gas in the hearth to shift along the furnace wall to the air suction port, effectively reducing the residence time of flying material in the furnace, improving the material accumulation condition of the hearth (mainly the furnace top) and the overall air flow environment in the furnace; at the same time, due to the flow rate difference between the blowing gas and the fuel gas (hydrogen), a certain pressure difference is formed between the two, so that the residence time of the flying material at the burner lamp port is shortened, and even the flying material does not pass through the lamp port, effectively preventing the occurrence of the lamp port material accumulation condition, solving the problem that the eddy current backflow in the existing hearth easily sticks to the flying material, and the flying material falling off causes small air bubbles on the surface of the quartz ingot or the whole quartz glass to be damaged due to the whole quartz glass falling on the material surface. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the utility model;

[0014] Figure 2 It is a bottom view structural schematic view; Figure 1

[0015] Figure 3 It is a schematic view of the flow field in the furnace when the ordinary burner is working;

[0016] Figure 4 It is a schematic view of the flow field in the furnace when the utility model is working.

[0017] ​In the figure: 1, oxygen warehouse; 2, hydrogen warehouse; 3, downcomer; 4, lamp shell; 5, material preservation pipe; 6, partition; 7, oxygen combustion pipe; 8, purge cavity; 9, oxygen communication pipe; 10, hydrogen communication pipe; 11, purge pipe. DETAILED DESCRIPTION

[0018] The burner is composed of oxygen warehouse 1, hydrogen warehouse 2, downcomer 3 and lamp shell 4, the central part of oxygen warehouse 1 is penetrated by material preservation pipe 5 and downcomer 3, and the material preservation pipe 5 and downcomer 3 extending to the upper part of oxygen warehouse 1 are arranged in an up-down manner and connected with each other in a fish-belly shape, the fish-belly-shaped downcomer 3 is arranged in a sealed manner with oxygen warehouse 1, and the purpose of arranging downcomer 3 in a fish-belly shape is to form a buffer effect on the raw material to prevent the raw material from blocking the core of downcomer 3 due to pressure; the purpose of arranging material preservation pipe 5 in a fish-belly shape is to effectively increase the internal pressure of material preservation pipe 5, thereby improving the gas flow rate in material preservation pipe 5.

[0019] The purpose of arranging material preservation pipe 5 on downcomer 3 is to prevent the raw material (SiCl4) in downcomer 3 from reacting with the external hydrogen-oxygen flame too early and blocking the core of downcomer 3.

[0020] Material preservation pipe 5 and downcomer 3 are arranged in a concentric parallel manner, which is to avoid the deviation of the material line guided by the material preservation gas to one side, thereby causing the growth of accumulated material on one side of oxygen combustion pipe 7 and lamp shell 4, resulting in the problem of dropping points (dropping of accumulated material), and even burning out the burner due to the overall flame deviation in severe cases.

[0021] The upper part of material preservation pipe 5 is externally connected with oxygen communication pipe 9, high-purity oxygen is introduced into material preservation pipe 5 through oxygen communication pipe 9 as material preservation gas, and the gas amount of material preservation pipe 5 is less than that of oxygen combustion pipe 7, thereby avoiding the situation that when the gas amount of material preservation pipe 5 is greater than that of oxygen combustion pipe 7, the raw material still does not react after reaching the target surface.

[0022] Oxygen warehouse 1 is externally connected with oxygen communication pipe 9, high-purity oxygen is introduced into oxygen warehouse 1 through oxygen communication pipe 9, the internal cavity of oxygen warehouse 1 stores high-purity oxygen to increase the internal pressure of oxygen warehouse 1, and the inner cavity formed between oxygen warehouse 1 and partition 6 is a sealed cavity, a plurality of oxygen combustion pipes 7 are arranged in a three-layer annular array on partition 6, and oxygen combustion pipes 7 penetrate partition 6 and communicate with oxygen warehouse 1.

[0023] The lower port of oxygen warehouse 1 is sealed with partition 6, and a plurality of oxygen combustion pipes 7 communicating with oxygen warehouse 1 are arranged in an annular stacked manner on partition 6, in working condition, high-purity oxygen in oxygen warehouse 1 enters a plurality of oxygen combustion pipes 7 under the action of pressure, to facilitate subsequent use as combustion-supporting gas.

[0024] Hydrogen warehouse 2 is sleeved on the outer circumferential surface of oxygen warehouse 1, and the lower ports of oxygen combustion pipe 7, material preservation pipe 5 and downcomer 3 are arranged in a flush manner.

[0025] The lower end of the oxygen combustion pipe 7, the material storage pipe 5 and the lower end of the material discharge pipe 3 are staggered with the lower end of the hydrogen gas chamber 2, which is to prevent external impurities from entering the burner while ensuring that hydrogen gas is fully dispersed into the hydrogen gas chamber and fully mixed with oxygen.

[0026] The hydrogen gas chamber 2 is externally connected with a hydrogen source through a hydrogen communication pipe 10, and the hydrogen gas chamber 2 is sleeved with a lamp shell 4 on the outer circumference. The lamp shell 4 is a variable-diameter tubular body, and the lower end of the lamp shell 4 is in a plugging state. Six purge pipes 11 are uniformly distributed on the circumference of the plugging lamp shell 4 lower end at an angle of 60 degrees. A purge chamber 8 is arranged between the lamp shell 4 and the hydrogen gas chamber 2, and the purge chamber 8 is a variable-diameter chamber with a large upper end and a small lower end. The purpose is to effectively increase the internal pressure of the purge chamber 8, thereby increasing the flow rate of high-purity oxygen in the purge chamber 8.

[0027] The purge chamber 8 is in communication with the purge pipe 11, and the purge chamber 8 is in communication with an oxygen source through an oxygen communication pipe 9. The oxygen source introduces high-purity oxygen into the purge chamber 8. The pipe opening of the purge pipe 11 is in the shape of a flat fish mouth, which is to increase the output flow rate of the purge gas.

[0028] The burner is installed on the hearth through the lamp shell 4, and the position of the opening of the purge pipe 11 is slightly higher than the bottom end of the lamp shell 4, so as to prevent the partial outward drift of the flame from burning the pipe opening and causing the pipe opening of the purge pipe 11 to be blocked. When the burner is performing the purging operation, the oxygen source injects high-purity oxygen into the purge chamber 8 through the oxygen communication pipe 9, which generates pressure in the purge chamber 8, and then the purge gas is blown out into the hearth through the purge pipe 11. The outer circle of the purge pipe 11 is in contact with the inner wall of the furnace top, so that the purge gas can be blown along the inner wall of the furnace, which can guide the internal airflow to the air exhaust port of the furnace to the greatest extent, thereby avoiding the vortex backflow in the hearth, which can cause the deposition of flying material on the burner and the furnace top, and the problem of falling of the flying material. This effectively solves the problem that the vortex backflow in the existing hearth easily causes the adhesion of flying material, and the falling of the flying material can cause small air bubbles on the surface of the quartz ingot or the whole piece of quartz glass to be damaged due to the whole piece of flying material falling on the material surface. Secondly, since the purge gas can guide part of the flying material in the furnace to move to the air exhaust port, the residence time of the flying material in the furnace is reduced, which effectively improves the airflow environment in the furnace, and is more conducive to the stable production of quartz glass ingots for a long time compared with ordinary burners.

Claims

1. A burner consisting of an oxygen tank (1), a hydrogen tank (2), a downcomer (3) and a lamp envelope (4), characterized in that: The central part of the oxygen bin (1) is provided with a material preserving pipe (5) and a material discharging pipe (3), the lower end of the oxygen bin (1) is provided with a partition plate (6), the partition plate (6) is provided with a plurality of oxygen combustion pipes (7) in annular layering and in communication with the oxygen bin (1), the hydrogen bin (2) is sleeved on the outer circumference of the oxygen bin (1), the lower ends of the oxygen combustion pipes (7), the material preserving pipe (5) and the material discharging pipe (3) are flush, the lower ends of the oxygen combustion pipes (7), the material preserving pipe (5) and the material discharging pipe (3) and the lower end of the hydrogen bin (2) are staggered, the lamp shell (4) is sleeved on the outer circumference of the hydrogen bin (2), the lower end of the lamp shell (4) is blocked, and the blocked lamp shell (4) is provided with a plurality of sweeping pipes (11) on the circumference of the lower end at an interval of 60 degrees.

2. A burner as claimed in claim 1, characterised in that: The lamp shell (4) and the hydrogen bin (2) are provided with a sweeping cavity (8) in communication with the sweeping pipes (11), and the sweeping cavity (8) is in communication with an oxygen source through a communication pipe.

3. A burner as claimed in claim 1, characterised in that: The material discharging pipe (3), the material preserving pipe (5), the oxygen bin (1) and the hydrogen bin (2) are mutually sealed.

4. A burner as claimed in claim 1, characterised in that: The oxygen bin (1) and the material preserving pipe (5) are respectively provided with an oxygen communication pipe (9) in communication with the oxygen source.

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