Combustion device of hollow bead spheroidizing furnace

Abstract

The utility model provides a combustion device of a hollow bead spheroidizing furnace, which comprises a hollow spheroidizing furnace body (1), and is characterized in that a group of combustors (2) are arranged at the bottom of the hollow spheroidizing furnace body (1); the combustor (2) comprises a feeding pipe (3), a gas pipe (4) and a combustion-supporting gas pipe (6) which are concentrically sleeved together in sequence, a group of spinning discs (7) are uniformly distributed on the gas pipe (4), one end of the combustion-supporting gas pipe (6) is connected with a combustion pipe (5), a flame spraying path (5a) in the combustion pipe (5) is connected with the upper end parts of the feeding pipe (3) and the gas pipe (4), and the upper end parts of the feeding pipe (3) and the gas pipe (4) are communicated with the combustion pipe (5). The glass bead burner is simple in structure and convenient to use, the mixing efficiency of fuel gas and combustion air is effectively improved, stable flames can be formed, and the bead forming rate, the color and the roundness of glass beads are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the preparation field of glass microbeads, and particularly relates to a combustion device of a hollow bead spheroidizing furnace. BACKGROUND

[0002] Hollow glass microbeads are a kind of hollow glass spheres with small size, which have the advantages of light weight, heat insulation, sound insulation, high and low temperature resistance, good electric insulation and thermal stability, corrosion resistance, etc. They can not only be widely used as a new type of filling material in the plastic industry, but also be used as a lightening agent for low-density cement and drilling fluid to solve the problem of deep drilling.

[0003] In the prior art of the hollow glass microbead burner, a glass microbead continuous manufacturing device is disclosed in Chinese patent CN1396130A, which has a jet type burner in the microbead sintering furnace. Glass particles enter the flame from a direction perpendicular to the flame of the burner for sintering. Due to the influence of air flow, the movement of molten glass microbeads cannot be limited, and they are prone to collide with the high-temperature furnace wall or other devices, so that it is difficult to manufacture small-particle glass microbeads, and the bead formation rate is very low.

[0004] US3361549 also introduces a device for manufacturing glass microbeads, which mainly comprises a furnace body, a burner and a funnel-shaped microbead collector. The top and side wall of the furnace body are isolated from the atmosphere, the burner is arranged at the center of the bottom of the furnace body, the nozzle is upward, the combustion gas and glass particles enter the burner through two ports respectively, the combustion gas acts as a carrier to carry the glass particles into the combustion chamber for combustion, the glass particles are molten and gradually cooled into beads under the action of the air flow, the air flow is forced to diffuse around the top of the furnace, and then flows downward along the furnace wall, forming a buffer layer between the hot air flow and the furnace wall. The downward air flow carries the microbeads to fall into the funnel-shaped microbead collector through the lower end of the furnace body, and the waste gas is directly discharged into the atmosphere from above the funnel. Since the nozzle of the burner is upward, the microbeads move upward under the action of the jet force, and then turn downward under the influence of gravity and convection. The upward and downward microbeads collide in the high temperature, which causes the deformation of the microbeads and reduces the yield. At the same time, the temperature difference in the furnace body is small, the cooling speed of the microbeads is slow, and the molten body is prone to accumulate on the nozzle of the burner. In addition, the glass particles are supplied to the combustion chamber in the combustion gas, which makes the flame and the glass particles not in good contact, and tends to form glass particle clumps.

[0005] The burner disclosed in CN201250178Y patent has independent material channels, combustion gas channels and combustion air channels, and the directions of the swirl vanes are inconsistent. The mixing of combustion air and combustion gas is not sufficient, and the powder cannot pass through the flame sufficiently during spheroidizing, which leads to insufficient foaming. Moreover, the problem of material blockage does not occur, and the yield of hollow glass microbeads is low. UTILITY MODEL CONTENTS

[0006] The utility model discloses a hollow glass bead preparation device which has the advantages of simple structure and stable combustion.

[0007] The application provides the following technical scheme:

[0008] A combustion device of a hollow spheroidizing furnace, which comprises a hollow spheroidizing furnace body, characterized in that a group of burners are installed at the bottom of the hollow spheroidizing furnace body.

[0009] On the basis of the above technical scheme, the following further technical schemes can also be used:

[0010] The group of swirl vanes are inclined to the same side on the outer wall of the gas pipe.

[0011] A grating is arranged at the upper end of the feed pipe and the gas pipe.

[0012] The group of burners are distributed on the same circumference.

[0013] The flame injection channel is in the shape of a horn with a large upper end and a small lower end.

[0014] The top end of the hollow spheroidizing furnace body is connected to a cyclone dust collector, a bag dust collector and an air induction fan in sequence through pipes.

[0015] The utility model has the advantages of simple structure, convenient use, improved mixing efficiency of gas and combustion air, suitability for various low-price coal gas, stable flame formation, convenient temperature control of the combustion flame by controlling the pressure and flow of the combustion gas and the combustion air, and suitability for the formation of glass microbeads of various particle sizes.

[0016] The utility model has the advantages of simple structure, convenient use, improved mixing efficiency of gas and combustion air, suitability for various low-price coal gas, stable flame formation, convenient temperature control of the combustion flame by controlling the pressure and flow of the combustion gas and the combustion air, and suitability for the formation of glass microbeads of various particle sizes. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a schematic diagram of the structure of the burner;

[0019] Figure 3 is Figure 2AA section view in the middle;

[0020] Figure 4 This is a schematic diagram of the burner distribution;

[0021] Figure 5 This is a schematic diagram of the burner structure in Example 2. Detailed Implementation

[0022] Example

[0023] like Figures 1-3 As shown, a combustion device for a hollow spheroidizing furnace includes a hollow spheroidizing furnace body 1. A cyclone dust collector 10, a baghouse dust collector 11, and an induced draft fan 12 are sequentially connected to the top of the furnace body 1 via pipes. A heat exchanger is also installed inside the furnace wall of the hollow spheroidizing furnace body 1. The water-cooled heat exchanger is an existing structure and will not be described in detail here.

[0024] A set of burners 2 is installed at the bottom of the hollow spherical furnace body 1. The set of burners 2 consists of three burners distributed on the same circumference.

[0025] The burner 2 includes an outer cylinder 8, inside which are installed a feed pipe 3, a gas pipe 4 and an auxiliary gas pipe 6, which are concentrically mounted together. A set of swirl vanes 7 are evenly distributed on the gas pipe 4. The swirl vanes 7 are rectangular, and all the swirl vanes 7 are the same size and distributed at the same horizontal height. All the swirl vanes 7 are inclined to the same side on the outer wall of the gas pipe 4.

[0026] One end of the feed pipe 3 is connected to the feed system 13, the gas supply system 14 and the oxygen-enriched combustion system 15. The feed system 13, the gas supply system 14 and the oxygen-enriched combustion system 15 are all existing structures, and will not be described in detail here.

[0027] This ensures that the combustion gas and combustion air flow out concentrically, but the air swirls clockwise, causing vigorous agitation and promoting thorough mixing. The swirling air and combustion gas mix and burn simultaneously in the fire channel (mentioned below), which helps form a stable flame and provides a favorable space for the microsphere roasting.

[0028] A combustion pipe 5 is connected to one end of the combustion-supporting pipe 6. The combustion pipe 5 contains coaxially distributed flame channels 5a, which are funnel-shaped, wider at the top and narrower at the bottom. The flame channels 5a in the combustion pipe 5 are connected to the upper ends of the feed pipe 3 and the combustion-supporting air pipe 4. A gas inlet and a combustion-supporting air inlet are respectively located at the lower ends of the feed pipe 3 and the combustion-supporting air pipe 4. A baffle 9 is provided at the upper ends of the feed pipe 3 and the combustion-supporting air pipe 4. Example

[0029] The difference between Example 1 and Example 2 is as follows: Figure 4As shown, a set of swirl vanes 7 are evenly distributed on the gas pipe 4, the swirl vanes 7 are rectangular, each of the swirl vanes 7 is the same size and is inclined to the same side, and the set of swirl vanes 7 are distributed from low to high on the outer wall of the gas pipe 4, that is, in a rotating staircase shape. Compared with embodiment 1, such a setting can achieve the same effect as embodiment 1 with fewer swirl vanes.

Claims

1. A combustion device of a hollow sphere furnace, comprising a hollow sphere furnace body (1), in the hollow sphere furnace body (1), characterized in that: A group of burners (2) are installed at the bottom of the hollow spheroidizing furnace body (1), the burner (2) comprises a feeding pipe (3), a gas pipe (4) and an auxiliary gas pipe (6) which are concentrically sleeved in sequence, a group of swirl vanes (7) are uniformly distributed on the gas pipe (4), a combustion pipe (5) is connected to one end of the auxiliary gas pipe (6), a flame injection channel (5a) in the combustion pipe (5) is connected to the upper end of the feeding pipe (3) and the gas pipe (4), a gas inlet and an auxiliary air inlet are respectively arranged at the lower end of the feeding pipe (3) and the gas pipe (4); the group of swirl vanes (7) are inclined to the same side on the outer wall of the gas pipe (4); the group of swirl vanes (7) are distributed from low to high on the outer wall of the gas pipe (4); the top end of the hollow spheroidizing furnace body (1) is connected to a cyclone dust collector (10), a bag dust collector (11) and an induced draft fan (12) in sequence through pipelines.

2. A burner for a hollow sphere generator as claimed in claim 1, characterized in that: A baffle (9) is arranged at the upper end of the feeding pipe (3) and the gas pipe (4).

3. A burner for a hollow sphere generator as claimed in claim 1, characterized in that: The group of burners (2) are distributed on the same circumference.

4. A burner for a hollow sphere generator as claimed in claim 1, characterized in that: The flame injection channel (5a) is a horn shape which is large at the top and small at the bottom.

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