CN201827889U - Preheated air wedge-shaped burner - Google Patents

Abstract

The utility model discloses a wedge-shaped burner for preheating air, which has a cylindrical main burning tube. An inner burner is coaxially arranged in the inner cavity of the main burning tube. The other end of the inner burner is sealed and connected with the end of the main burning tube, and the sealed end is provided with a gas connecting pipe communicating with the inner cavity of the inner burner; the main burning tube near the closed end There is an air intake pipe radially connected to the outer wall of the inner burner, and a number of air intake holes are opened on the outer wall of the inner burner away from the closed end. Connected; the outer wall of the main burning tube is obliquely connected with a mounting flange. The installation flange and the axis of the main combustion tube form an included angle of 40-45°. When the burner is installed on a circular industrial furnace, the flame ejected from the inner burner can enter along the tangential direction of the furnace cavity, so that the inner combustion The flame ejected from the nozzle can fully stir the airflow in the furnace chamber to achieve the uniformity of its temperature field.

Description

Preheating Air Wedge Burner

Technical field:

The utility model relates to a preheating air wedge burner, in particular to a burner used for industrial heating and melting of full hydrogen bell furnaces, annealing furnaces and metal melting furnaces.

Background technique:

For the burner used in the existing industrial furnace, the central axis of the burner and the mounting flange are in the vertical direction, it is difficult to let the flame of the burner enter along the tangential direction of the industrial furnace, and it is impossible to disturb the air flow in the furnace cavity and realize its Uniformity of the temperature field. Existing burners are not easy to ignite in a cold state, or are easy to extinguish in a hot state. The burner in the existing burner is a trumpet design, the shape of the flame is uncontrolled, and the flame speed is low, which is not conducive to the flow of high-temperature air in the industrial furnace, resulting in uneven temperature. The thermal efficiency of the existing burner is low, which causes waste of energy.

Invention content:

In order to overcome the defects of the prior art, the purpose of this utility model is to provide a preheating air wedge burner, which is easy to install and can effectively reduce the energy consumption of industrial furnaces and the exhaust temperature of flue gas. It can be ignited reliably at room temperature, and can burn stably up to 500 degrees Celsius after the combustion air is preheated.

The utility model solves the technical problem and adopts the following technical solutions:

The preheating air wedge burner has a cylindrical main burning tube, and an inner burner is coaxially arranged in the inner cavity of the main burning tube. The inner cavity of the main burning tube is connected, and the other end of the inner burner is sealed and connected with the end of the main burning tube, and the sealed end is provided with a gas connecting pipe communicating with the inner cavity of the inner burner; the main burning tube near the closed end The outer wall of the burning tube is radially connected with an air intake pipe, and the outer wall of the inner burner away from the closed end is provided with a number of air intake holes. The inner cavity of the inner burner is communicated; the outer wall of the main burning tube is obliquely connected with an installation flange.

An ignition electrode and an ultraviolet detector are arranged at the closed end of the main burning tube.

The included angle formed between the mounting flange and the axis of the main combustion tube is 40-50°.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

1. The preheating air wedge burner of this utility model realizes direct ignition or indirect ignition, and can use 500 degrees Celsius preheating combustion-supporting air without affecting the normal operation of the burner. Even if the combustion system starts at normal temperature, the burner can also Successfully ignite and maintain stable combustion.

2. The unique design of the inner cavity of the preheating air wedge burner of this utility model can increase the flame speed of the jet, and the flame speed can reach 80-120m/s, ensuring that the airflow in the industrial furnace is fully mixed and realizes industrial Temperature uniformity in the furnace.

3. Use ion induction flame detection or UV ultraviolet flame detection.

4. It is connected with the furnace body by flange, which is convenient for installation and maintenance.

5. The burner can be burned directly in a cold state - no need to preheat the burner.

6. The design is suitable for high back pressure environment in the furnace cavity.

7. The installation flange and the axis of the main burning tube form an included angle of 40-45°. When the burner is installed on a circular industrial furnace, the flame ejected from the inner burner can enter along the tangential direction of the furnace cavity, so that The flame ejected from the inner burner can fully stir the airflow in the furnace cavity to achieve the uniformity of its temperature field.

Description of drawings:

Fig. 1 is a schematic structural view of the burner of the present invention.

Numbers in the figure: 1 main burning pipe, 2 mounting flange, 3 bolts, 4 insulation sleeve, 5 ignition electrode, 6 gas connecting pipe, 7 ultraviolet detector, 8 air intake pipe, 9 air intake hole, 10 inner burner .

The utility model will be further described below through specific embodiments in conjunction with the accompanying drawings.

Detailed ways:

Embodiment: In conjunction with Fig. 1, the preheated air wedge burner of the present embodiment has a cylindrical main burning tube 1, and an inner burner 10 is coaxially arranged in the inner cavity of the main burning tube, and one end of the inner burner 10 (The end protruding into the main burning tube) the inner cavity is gradually closed, and the end of the inner burner communicates with the inner cavity of the main burning tube, and the other end of the inner burner 10 is sealed and connected with the end of the main burning tube 1 The sealed end is provided with a gas connection pipe 6 communicating with the inner cavity of the inner burner 10; the outer wall of the main burning tube near the closed end is radially connected with an air intake pipe 8, and the outer wall of the inner burner away from the closed end is provided with A number of air intake holes 9, the air intake pipe 8 communicate with the inner cavity of the inner burner through the interlayer of the main burning tube and the inner burner, and the air inlet 9 communicates with the inner cavity of the inner burner; the outer wall of the main burning tube 1 is obliquely connected with a mounting flange 2. The closed end of the main burning tube 1 is provided with an ignition electrode 5 and an ultraviolet detector 7 .

The angle formed between the installation flange 2 and the axis of the main combustion tube 1 is 40-50°. When the burner is installed on the circular industrial furnace through the installation flange 2 and bolts 3, the flame ejected from the inner burner It can enter along the tangential direction of the furnace cavity, so that the flame ejected from the inner burner can fully stir the airflow in the furnace cavity to achieve the uniformity of its temperature field.

In order to withstand the preheated air at 500 degrees Celsius, an insulation sleeve 4 is provided in the interlayer between the main combustion tube 1 and the inner burner 10. The lining of the preheated air insulation sleeve 4 is made of mullite insulation material to ensure combustion The temperature of the outer surface of the device is not higher than 90 degrees Celsius. The inner burner air inlet 9 provided on the inner burner 10 body can partially introduce the combustion air into the inner burner to realize stable combustion and maintain the root of fire. A large amount of preheated air and gas are mixed and burned at the ends of the main combustion tube 1 and the inner burner 10 .

working principle:

The preheated air with a temperature of 500 degrees Celsius or higher enters the interlayer between the main burning pipe 1 and the inner burner from the air inlet pipe 8, part of the air enters the inner burner from the air inlet 9, and the combustible gas enters the inner burner from the gas connecting pipe 6. Part of the preheated air and part of the combustible gas are mixed to achieve a certain combustion ratio, and the ignition electrode 5 generates a high-voltage electric spark to ignite the mixed gas. Most of the preheated air and combustible gas are mixed and burned at the end of the main combustion tube 1 and the inner burner 10. The unique design of the inner burner shrinking improves the flame ejection speed, and the flame speed can reach 80-120m/s.

Claims (3)

1. Preheating air wedge burner is characterized in that there is a cylindrical main burner (1), and an inner burner (10) is coaxially arranged in the inner chamber of the main burner, and the inner burner The cavity at one end is gradually gathered and communicated with the cavity of the main burning tube at its end, the other end of the inner burner is sealed and connected with the end of the main burning tube, and the sealed end is provided with the inner burner ( 10) The gas connecting pipe (6) with the internal cavity connected; the air intake pipe (8) is radially connected to the outer wall of the main burning tube near the closed end, and a number of air intake holes (9) are opened on the outer wall of the inner burner away from the closed end ), the air inlet pipe (8) communicates with the inner cavity of the inner burner through the main burning pipe and the interlayer of the inner burner and the air inlet; the outer wall of the main burning pipe is obliquely connected with a mounting flange (2 ). 2. The preheating air wedge burner according to claim 1, characterized in that an ignition electrode (5) and an ultraviolet detector (7) are arranged at the closed end of the main burning tube. 3. The preheating air wedge burner according to claim 1, characterized in that the angle formed between the mounting flange (2) and the axis of the main combustion tube (1) is 40-50°.

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