Dual-electrode power frequency long-time plasma igniter

Abstract

The utility model discloses a dual-electrode power-frequency long-time plasma igniter, which relates to the technical field of plasma igniters and comprises a compressed air pipeline, a gas pipeline, a power-frequency plasma control box, dual electrodes for plasma discharge and an ignition burner. The ignition burner is connected with the power frequency plasma control box through a high-voltage wire and the double electrodes for plasma discharge, and the ignition burner is connected with a compressed air pipeline and a gas pipeline through igniter metal hoses. When gas combustion equipment is ignited, high voltage larger than 10 Kv is generated at the front end of the double electrodes for plasma discharge through the power frequency plasma control box, air between the electrodes is punctured, plasma is generated, the plasma stably exists for a long time, mixed gas of gas and compressed air can be ignited, continuous discharge can be achieved in the follow-up combustion process, and the service life of the gas combustion equipment is prolonged. Therefore, the stability of flame combustion is maintained.

Description

Technical Field

[0001] The utility model belongs to the technical field of plasma igniters, and in particular relates to a double-electrode power frequency long-time plasma igniter. Background Art

[0002] There are three general types of igniters currently used in the field of metallurgical combustion:

[0003] 1. High-voltage electric spark igniter: its advantage is low cost, but its disadvantage is low ignition success rate.

[0004] 2. High-pressure, high-energy igniter: Its advantage is that the ignition success rate is higher than that of the electric spark igniter. Its disadvantage is that it cannot ignite for a long time and cannot adapt to low calorific value gas.

[0005] 3. High-frequency and high-pressure plasma igniter: Its advantage is that it can adapt to low calorific value gas, but its disadvantage is that it cannot ignite for a long time and has a high failure rate.

[0006] An igniter is needed that can ignite for a long time, adapt to coal gas with different calorific values ​​from low calorific value to high calorific value, and has a low failure rate and a long service life. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a dual-electrode power frequency long-time plasma igniter in view of the deficiencies of the background technology.

[0008] The present invention adopts the following technical solutions to solve the above technical problems:

[0009] A dual-electrode power-frequency long-time plasma igniter comprises a compressed air pipeline, a gas pipeline, a power-frequency plasma control box, a dual electrode for plasma discharge, and an ignition burner; the ignition burner is connected to the power-frequency plasma control box via a high-voltage wire and the dual electrode for plasma discharge, respectively, and the ignition burner is connected to the compressed air pipeline and the gas pipeline via an igniter metal hose.

[0010] As a further preferred solution of the dual-electrode power frequency long-time plasma igniter of the utility model, the compressed air pipeline is provided with a compressed air manual ball valve, a compressed air pressure regulating valve, and a compressed air pneumatic ball valve; the power frequency plasma control box is connected to the compressed air pneumatic ball valve via a valve switch control cable.

[0011] As a further preferred solution of the dual-electrode power frequency long-time plasma igniter of the present invention, the gas pipeline is provided with a gas manual ball valve and a gas pneumatic ball valve; the power frequency plasma control box is connected to the gas pneumatic ball valve via a valve switch control cable.

[0012] As a further preferred embodiment of the dual-electrode industrial frequency long-time plasma igniter of the present invention, the dual electrodes for plasma discharge are of a detachable structure.

[0013] As a further preferred embodiment of the dual-electrode industrial frequency long-time plasma igniter of the present invention, the power supply of the dual electrodes for plasma discharge adopts 220V industrial frequency alternating current.

[0014] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0015] The utility model relates to a dual-electrode power-frequency long-time plasma igniter. When igniting a gas combustion device, the utility-frequency plasma control box can generate a high voltage of more than 10KV at the front end of the dual electrodes for plasma discharge, break down the air between the electrodes, and generate plasma. The plasma exists stably for a long time, can ignite a mixture of gas and compressed air, and can continue to discharge during the subsequent combustion process to maintain the stability of flame combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural principle diagram of a double-electrode power-frequency long-time plasma igniter of the utility model.

[0017] The numbers in the figure are as follows: 1-compressed air manual ball valve; 2-compressed air pressure regulating valve; 3-compressed air pneumatic ball valve; 4-gas manual ball valve; 5-gas pneumatic ball valve; 6-valve switch control cable; 7-igniter metal hose; 8-power frequency plasma control box; 9-high voltage line; 10-dual electrode for plasma discharge; 11-ignition burner. DETAILED DESCRIPTION

[0018] 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 shall fall within the scope of protection of the present invention:

[0019] Double-electrode power frequency long-time plasma igniter, such as Figure 1As shown, the system includes a compressed air pipeline, a gas pipeline, a power-frequency plasma control box 8, a dual-electrode plasma discharge system 10, and an ignition burner 11. The ignition burner 11 is connected to the power-frequency plasma control box 8 via a high-voltage line 9 and dual-electrode plasma discharge system 10, respectively. The ignition burner 11 is connected to the compressed air pipeline and gas pipeline via an ignition metal hose 7. The compressed air pipeline is equipped with a manual compressed air ball valve 1, a compressed air pressure regulating valve 2, and a pneumatic compressed air ball valve 3. The power-frequency plasma control box 8 is connected to the pneumatic compressed air ball valve 3 via a valve switch control cable 6. The gas pipeline is equipped with a manual gas ball valve 4 and a pneumatic gas ball valve 5. The power-frequency plasma control box 8 is connected to the pneumatic gas ball valve 5 via a valve switch control cable 6.

[0020] The dual electrodes 10 for plasma discharge are fixed to the upper flange cover as an integral unit and are a detachable structure. Before being installed in the ignition burner, the plasma discharge distance is manually confirmed and the distance between the front ends of the dual electrodes is controlled to be less than 10 mm. The gas between the dual electrodes is broken down by industrial frequency high voltage to generate high-temperature plasma. The mixture of coal gas and compressed air ignites when it contacts the plasma.

[0021] The power supply uses 220V industrial frequency AC power, which passes through the industrial frequency plasma control box to generate >10kV AC high voltage. Compared with traditional high-frequency DC high voltage, two electrodes are required to prevent discharge to the ground or to the equipment. This also effectively solves the problem of high-frequency plasma control boxes easily overheating after long-term use. Therefore, the industrial frequency plasma control box can be powered for a long time, continuously generating high-temperature plasma at the front ends of the two electrodes.

[0022] Control logic:

[0023] Step 1, power supply to the power frequency plasma control box 8;

[0024] Step 2: plasma discharge is continuously performed using the dual electrodes 10;

[0025] Step 3: The compressed air and gas pneumatic valves are automatically opened;

[0026] Step 4, ignition burner 11 ignites;

[0027] Step 5: Manual confirmation of fire or detection of fire by a flame detection device;

[0028] Step 6: The plasma discharge is terminated by using the dual electrodes 10 or by remote program control of the intermittent discharge.

[0029] Control mode: local control and remote control.

[0030] Discharge time: continuous discharge

[0031] Electrode discharge distance: <10mm

[0032] Burner type: premixed type, coal gas and compressed air are mixed in advance and then burned and ejected.

[0033] The utility model relates to a dual-electrode power-frequency long-time plasma igniter. When igniting a gas combustion device, the utility-frequency plasma control box can generate a high voltage of more than 10KV at the front end of the dual electrodes for plasma discharge, break down the air between the electrodes, and generate plasma. The plasma exists stably for a long time, can ignite a mixture of gas and compressed air, and can continue to discharge during the subsequent combustion process to maintain the stability of flame combustion.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such herein.

[0035] The above embodiments are only for the purpose of illustrating the technical concept of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications made based on the technical solution in accordance with the technical concept of the present invention shall fall within the scope of protection of the present invention. The above embodiments of the present invention are described in detail, but the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. Double-electrode power frequency long-time plasma igniter, characterized by: The invention comprises a compressed air pipeline, a gas pipeline, a power frequency plasma control box (8), a double electrode for plasma discharge (10) and an ignition burner (11); the ignition burner (11) is connected to the power frequency plasma control box (8) via a high voltage line (9) and the double electrode for plasma discharge (10), and the ignition burner (11) is connected to the compressed air pipeline and the gas pipeline via an igniter metal hose (7).

2. The dual-electrode power frequency long-time plasma igniter according to claim 1, characterized in that: The compressed air pipeline is provided with a compressed air manual ball valve (1), a compressed air pressure regulating valve (2), and a compressed air pneumatic ball valve (3); the industrial frequency plasma control box (8) is connected to the compressed air pneumatic ball valve (3) via a valve switch control cable (6).

3. The dual-electrode power frequency long-time plasma igniter according to claim 1, characterized in that: The gas pipeline is provided with a gas manual ball valve (4) and a gas pneumatic ball valve (5); the power frequency plasma control box (8) is connected to the gas pneumatic ball valve (5) via a valve switch control cable (6).

4. The dual-electrode power frequency long-time plasma igniter according to claim 1, characterized in that: The double electrodes (10) for plasma discharge are of a detachable structure.

5. The dual-electrode power frequency long-time plasma igniter according to claim 1, characterized in that: The power supply of the double electrodes (10) for plasma discharge adopts 220V industrial frequency alternating current.

Images