CN104879780A - Multichannel plasma area igniting burner - Google Patents

Abstract

The invention discloses a multi-channel plasma region ignition and combustion device, comprising: a plasma power supply, a nozzle, an intake fish mouth, a tangential air hole, a gas pipe, a hollow insulator, a high-voltage electrode, an insulator, a low-voltage electrode, a casing, and a swirling flow chamber, pore, blocking medium, low velocity area, center jet, and flame stabilization chamber; it utilizes the splash plate in the intake pipe to atomize the fuel, and a mixture of high-speed rotating airflow and direct-flow jet is set in the ignition device, and the two airflows are activated at the same time. The function of cooling the ignition device; between the high-voltage and low-voltage electrodes, it is filled with low-speed flowing combustible gas mixture to realize multi-point discharge ignition in the low-speed gas mixture area in the ignition device. The function of ignition source and flame stability constitutes a miniature high-speed combustion chamber, so as to realize efficient and reliable ignition and flame stability of the combustion chamber under harsh conditions such as high speed, low temperature, low pressure, and coal combustion.

Description

A multi-channel plasma zone ignition combustion device

technical field

The invention relates to the field of aerospace technology and the field of industrial combustion, in particular to a multi-channel plasma region ignition and combustion device.

Background technique

Common ignition methods include hot surface, laser-induced spark, spark plug and plasma flow. They all heat the unburned gas mixture to increase its temperature, generate initial free radicals, and then initiate a chain reaction from these initial free radicals. For hot surface ignition, the ignition delay time is longer and the life is relatively short; laser-induced spark ignition requires focused high-energy laser pulses; spark plug ignition is a widely used and relatively reliable ignition method. The above-mentioned ignition methods all have the problem of small ignition area. When the combustion conditions are very bad, such as high-altitude low-pressure ignition, supersonic combustion, lean combustion, etc., the applicability and reliability of the existing ignition methods have defects, which will lead to Cause ignition difficulty or ignition failure.

The main ignition modes of existing engines are hot jet ignition, pre-chamber ignition and spark plug ignition. Hot jet ignition is to supply a stream of fuel in the main combustion chamber for combustion, and generate a flame, which passes through the turbine and ignites the afterburner. The disadvantages have a certain impact on the reliability of the turbine, and the system is more complicated. The catalyst for catalytic ignition is prone to failure and corrosion, and the ignition delay time is long. The pyrotechnic ignition can only be used once on the engine, and multiple ignitions cannot be achieved. The afterburner and ramcombustion chamber of high-altitude aircraft, under the conditions of high speed, low pressure and low temperature, the pressure can be as low as 0.04-0.05MPa, the temperature can drop to 50-150℃, and the airflow velocity is above 100m/s, due to atomization Evaporation is difficult, the heat released per unit volume is reduced, but the heat dissipation is strong, not only the speed-pressure boundary of ignition is sharply reduced, but also the air-fuel ratio boundary of ignition is also sharply reduced. If you continue to use the spark plug to ignite, the possibility of failure is greatly increased. In order to ensure the reliable ignition of the engine under various extreme conditions, it is necessary to overcome the defect that the spark plug is difficult to ignite under high altitude and low pressure, and it is hoped to develop an advanced ignition technology.

When starting pulverized coal boilers in power stations, fuel nozzles were used to ignite at the earliest, which consumes a lot of fuel and costs a lot. The thermal plasma ignition device is then used, which has high cost and service life, while the gasification small oil gun uses compressed air and other equipment for ignition, and the system is relatively complicated, which needs further improvement and optimization.

Low-temperature plasma ignition and combustion enhancement is a new application of plasma technology, which has the potential to achieve reliable, efficient ignition and rapid combustion of lean mixtures. This technology has attracted widespread attention from all over the world. AC-driven dielectric barrier discharge is the main way to generate low-temperature plasma, which can generate low-temperature plasma with large volume and high energy density under a certain pressure, and due to the existence of insulating medium between electrodes, it avoids the local discharge or arc discharge. Low-temperature plasma ignition is mainly through discharge in the combustible mixture, and the collision between the generated high-energy electrons and fuel molecules causes the dissociation, excitation and even ionization of molecules, and produces a large number of active atoms, molecules and ions, thereby improving ignitability and combustion. stability. The chemical reaction is carried out at multiple points, and the ignition process is accelerated, thereby successfully achieving large-volume ignition, and the flame fills the entire air flow channel section, greatly shortening the ignition delay time and improving the ignition limit, high ignition efficiency, and saving ignition energy.

Using continuous AC drive in foreign countries, when the combustible mixture passes through the discharge space, low-temperature plasma will be generated, and large-volume ignition has been successfully realized, and the flame fills the entire discharge space, which greatly shortens the ignition delay time and improves the ignition limit. However, when continuous discharge is used to ignite, the barrier medium is easily broken down in a high-temperature flame, thus turning into a continuous discharge. In the mixed gas, the power consumption of the two is relatively large, and the reliability is not enough. Domestic experiments have confirmed that under the conditions of combustible gas mixture pressure range of 0.02-0.1Mpa and flow velocity of 5-70m/s, single-sided dielectric barrier discharge is used, and methane, ethylene, and gasoline fuels are used as fuels to achieve a large volume of the entire gas mixture channel section. ignition.

Spark plug ignition and thermal plasma flow ignition rely on discharge arc to break down the medium. Although thermal plasma has certain advantages over spark plugs, it improves ignition performance and shortens delay time than spark plugs, but it belongs to small volume ignition, and thermal plasma flow ignition requires a lot of energy consumption. The energy, ignition efficiency is low, the ignition electrode is easy to corrode, the system equipment is complicated, and there is no successful application case of thermal plasma ignition technology in the aviation field. To ignite in the high-speed airflow in the engine, it is necessary to install a flame stabilizing device in front of the spark plug, so as to generate a certain low-speed zone and recirculation zone in the vicinity of the spark plug, so that tiny flame clusters are generated through weak ignition energy, and gradually develop, and the flame develops into Stable combustion state. Spark plug ignition and plasma jet both belong to plasma ignition, but the number and area of ions produced are different. The energy waste of the two is relatively serious. The spark plug with small energy consumption only discharges between the high-voltage electrode and the low-voltage electrode with a small gap. If it is inserted into the air mixture, if the flow velocity is high and the pressure and temperature are low, ignition difficulties will occur, and the airflow velocity near the spark plug is closely related to the working state of the engine and cannot be controlled separately, so ignition difficulties are inevitable .

The engine is in high-altitude, high-speed, low-pressure, and low-temperature flight conditions, and the working conditions of the combustion chamber are very harsh. Problems such as difficulty in low-pressure ignition, poor combustion stability, and reduced combustion efficiency are prone to occur. The start-up of coal-fired boilers in power stations also requires high-efficiency ignition devices to further reduce costs and reduce pollution emissions.

Contents of the invention

The technical problem to be solved by the invention is how to realize efficient and reliable ignition and flame stability of the engine under high speed, low temperature and low pressure conditions, and the ignition device of the pulverized coal boiler of the power station.

In order to solve the above technical problems, the present invention discloses a multi-channel plasma regional ignition and combustion device, including: plasma power supply, nozzle, intake fish mouth, tangential air hole, air pipe, hollow insulator, high-voltage electrode, insulator, low-voltage Electrode, casing, swirl chamber, air hole, barrier medium, low-velocity zone, central jet, flame-stabilizing chamber; the plasma power supply outputs AC-driven high voltage and low current, and ignites the low-velocity zone through the discharge between the high-voltage electrode and the low-voltage electrode The combustible gas mixture; the nozzle is installed on the wall of the intake fish nozzle; the intake nozzle refers to the inlet pipe with splash plate atomization in the middle, installed on the shell, and is sealed with the shell to ensure After the high-speed airflow enters the swirl chamber, a high-speed swirling airflow is generated; the air pipe is connected to the hollow insulator, and the mixed air is sent to the pipeline of the high-voltage electrode to supply the fuel mixed air, or the air intake fish mouth is used alone to supply the fuel mixed air The hollow insulator is installed between the high-voltage electrode and the air pipe, the downstream is the high-voltage electrode, and the upstream is the air pipe to ensure the insulation between the high-voltage electrode and the air pipe; the high-voltage electrode is a hollow metal body, which is installed at the center of the ignition device , there is a central jet hole inside, and the outer side is connected to the insulator, which is connected to the high-voltage line of the plasma power supply; the insulator is installed between the high-voltage electrode and the low-voltage electrode, the inner side is the high-voltage electrode, the outer side is the low-voltage electrode, and the high-voltage The electrode and the low-voltage electrode are coaxial; the low-voltage electrode is a hollow circular tube with a certain number of air holes on it to ensure the gas flow in the low-velocity area of the high-voltage electrode and the low-voltage electrode. The inner side is an insulating part, and the outer side is a shell , tightly connected with the inner insulating part and the outer casing, which is connected with the low-voltage line of the plasma power supply; the outer casing is a cylindrical hollow metal part, the inner side is connected with the low-voltage electrode, and the outer wall surface is sealed with the intake fish mouth, One end is connected to the insulating medium, and the other end is connected to the flame stabilization chamber; the swirling flow chamber is a swirling air flow channel in the casing, the outer side is the shell, the inner side is a low-voltage electrode, and one end is an outlet connected to the flame stabilization chamber; The pores mentioned above are a certain number of mixed gas flow holes on the voltage electrode; the barrier medium refers to the insulating material installed on the outside of the high voltage electrode to ensure that a large volume of low temperature plasma is generated in the low velocity area between the high voltage electrode and the low voltage electrode body; the low-velocity zone is the space flow area between the high-voltage electrode and the low-voltage electrode to ensure reliable ignition under low-speed conditions; the central jet is the jet at the center of the high-voltage electrode to ensure the penetration of the jet flame of the ignition device; The flame stabilization chamber described above is a stable combustion area with a certain shape, which is installed at the outlet at one end of the casing.

Further, as a preference, a multi-channel plasma regional ignition and combustion device is characterized in that it includes: a plasma power supply, a nozzle, an intake fish mouth, a tangential air hole, a gas pipe, a hollow insulator, a high-voltage electrode, an insulator, Low-voltage electrodes, shells, swirl chambers, air holes, protrusions, low-velocity areas, central jets, and flame-stabilizing chambers; the plasma power supply outputs AC-driven high-voltage and low-current, and ignites low-velocity through discharge between high-voltage electrodes and low-voltage electrodes. The combustible gas mixture in the area; the nozzle is installed on the wall of the intake fish mouth pipe, and the fuel is directly sprayed onto the splash plate; the intake fish mouth refers to the intake pipe with splash plate atomization in the middle, installed on On the shell, it is sealed with the shell to ensure that the high-speed airflow enters the swirling chamber to generate high-speed swirling airflow; the air pipe is connected to the hollow insulator to send the mixed gas into the pipeline of the high-voltage electrode to supply the fuel mixed gas, or separately The intake fish mouth is used to supply fuel mixture; the hollow insulator is installed between the high-voltage electrode and the air pipe, the downstream is the high-voltage electrode, and the upstream is the air pipe; the high-voltage electrode is a hollow metal body, which is installed in the center of the ignition device The electrode has a central jet hole inside, and the outside is connected to the insulator, which is connected to the high-voltage line of the plasma power supply; the insulator is installed between the high-voltage electrode and the low-voltage electrode, and the inside is a high-voltage electrode, and the outside is a low-voltage electrode , the high-voltage electrode and the low-voltage electrode are coaxial; the low-voltage electrode is a hollow circular tube with a certain number of air holes on it to ensure the gas flow in the low-velocity area of the high-voltage electrode and the low-voltage electrode. The inner side is an insulating part, and the outer side is The shell is tightly connected with the inner insulating part and the outer shell, which is connected to the low-voltage line of the plasma power supply; the shell is a cylindrical hollow metal part, the inner side is connected with the low-voltage electrode, and the outer wall surface is sealed with the intake fish mouth Connected, one end is an outlet connected to the flame stabilization chamber; the swirl chamber is a swirling air flow channel in the casing, the outer side is the casing, the inner side is a low-voltage electrode, one end is connected to the insulating medium, and the other end is communicated with the flame stabilization chamber; The air hole is a certain number of mixed gas flow holes on the low-voltage electrode; a certain number of protrusions are arranged on the high-voltage electrode, the size of which is the same, and the outer diameter of the outer end is the same to ensure that each protrusion of the high-voltage electrode flows toward the low-voltage electrode. The probability of discharge is the same; the low-speed area is the space flow area between the high-voltage electrode and the low-voltage electrode to ensure reliable ignition under low-speed conditions; the central jet is the jet at the center of the high-voltage electrode to ensure the penetration of the jet flame of the ignition device Capacity; the flame stabilization chamber is a stable combustion area with a certain shape, which is installed at the outlet at one end of the shell.

Further, as a preference, the air intake fish mouth is installed on the inlet end of the shell and the low-voltage electrode, and is connected to the inlet in a sealed manner; There are one or more blades, the outlet blades make the airflow rotate at high speed in the swirl chamber, and the width of the outlet blades is the same as the radial distance of the swirl chamber.

Further, as a preference, the air intake fish mouth is installed at the opposite end of the housing to the flame stabilization chamber, and is sealed and connected with the housing; the tangential air hole is an air inlet, and its height is the same as the radial distance of the swirl chamber same.

Further, as a preference, the gap between the protrusions is 2-10mm.

Further, as a preference, the tangential air hole is the outlet vane of the inlet fish mouth to make the air flow rotate at a high speed in the swirl chamber.

Further, as a preference, the insulating member is a high-temperature ceramic.

Further, as a preference, the high-voltage electrode is a round tube or a cylinder.

Further, as a preference, one end of the air pipe is connected to the intake fish mouth, or the air pipe uses a separate air intake fish mouth to supply fuel mixture.

Further, as a preference, the voltage, current and AC frequency of the plasma power supply are respectively: 1-10kV, 0.1-10A and 10-500kHz.

Further, as a preference, the discharge frequency and the discharge time of each cycle of the plasma power supply are respectively: 2-1000 Hz and 0.2-500 ms.

Further, as a preference, the power supply uses a nanosecond pulse power supply under low-frequency working conditions.

Due to the discharge in the low-speed area of the ignition device, the multi-point ignition of the mixed gas area is realized, and this area is a high-temperature combustion thermonuclear area, which plays the role of ignition source and flame stabilization, thereby achieving high efficiency and reliability under high-speed, low-temperature and low-pressure conditions. Ignition and flame stability. The invention makes full use of the fuel atomization, evaporation, blending and combustion stabilizing functions of the high-speed rotating airflow, and the penetration ability of the high-speed central jet flame of the high-voltage electrode, and realizes plasma multi-point ignition and regional ignition in the low-speed area between the high-voltage electrode and the low-voltage electrode. , the low-velocity zone is the thermonuclear zone of high-temperature combustion, and the outlets of the high-voltage electrode and the low-voltage electrode are the recirculation zone, forming a miniature high-speed combustion chamber, which has the following advantages:

①A jet mixed gas is set in the center of the high-voltage electrode to increase the turbulence in the combustion zone, improve the mixing of oil and gas, and strengthen the flame rigidity.

②Use the intake fish mouth to tangentially introduce high-speed rotating fuel mixture, which greatly improves the performance of fuel atomization, evaporation and mixing, with simple structure and small flow loss.

③, The low-velocity zone between the high-voltage electrode and the low-voltage electrode is less affected by the external airflow. Multiple discharge protrusions on the high-voltage electrode realize multi-point and regional discharge ignition.

④Through the air holes on the low-voltage electrode and the outlet of the low-velocity zone, the fresh air mixture is continuously supplied to the low-velocity zone, and the combustion products are discharged at the same time.

⑤The central jet in the flame stabilization chamber passes through the recirculation zone formed by the rotating airflow, and there is a transition zone with high turbulence and low speed between the two airflows, so the ignition ring is a double-layer annular space structure with strong ignition ability.

⑥The speed of the central jet and the swirling airflow is very high, there is no flame in the high-voltage electrode and the swirl chamber, and the airflow cools the ignition device to ensure the safety and reliability of the ignition device.

⑦.Small size, simple structure, strong flame rigidity, strong penetrating ability, sufficient combustion, and can establish a stable ignition source.

Therefore, a multi-channel plasma zone ignition combustion device of the present invention can improve the oil atomization evaporation combustion performance of fuel oil under the conditions of low pressure, low temperature and high-speed airflow, improve the reliability of high-altitude ignition and secondary ignition, and improve combustion performance. And meet the ignition needs of coal-fired boilers in power stations.

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will readily be learned by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and constitute A part of the present invention, the exemplary embodiment of the present invention and its description are used to explain the present invention, and do not constitute an improper limitation of the present invention, wherein:

Fig. 1 is a schematic structural diagram of Embodiment 1 of a multi-channel plasma zone ignition combustion device.

Fig. 2 is a schematic structural diagram of Embodiment 2 of a multi-channel plasma zone ignition combustion device.

Detailed ways

Embodiments of the present invention will be described with reference to FIGS. 1-2.

In order to make the above objects, features and advantages more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

After reforming the low-temperature plasma power supply, it can generate low-temperature plasma intermittently, the discharge time is adjustable from 0.1-1000ms, and the frequency is 0.1-1000 Hz. The dielectric barrier discharge is used to generate a large amount of low-temperature plasma in the discharge area, which can realize the ignition of the combustible gas mixture in the low-velocity area between the high-voltage electrode and the low-voltage electrode. If the discharge area is expanded to the low-voltage electrode through multiple protrusions on the high-voltage electrode in the space, even if the mixed gas composition and airflow velocity in different areas are different, as long as the local area is within the ignition flammable boundary and speed limit, ignition can be guaranteed success. Experiments have proved that the energy of a single discharge is much lower than that of a spark plug, but the frequency can be very high, for example, the discharge frequency is 200 Hz, and there are 20 protrusion discharge points, which are in different positions in the gas mixture, and it is assumed that each protrusion The discharge probability of the bumps is the same, and the discharge frequency of each discharge bump is 10 Hz per second. For the combustible gas mixture flowing between the discharge electrodes, as long as the gas mixture flowing through a certain discharge protrusion is suitable, the ignition will be successful. According to this idea, the regional ignition method and technology under the condition of high-speed airflow are developed and designed to provide a guarantee for the reliable ignition of the aircraft at high altitude and low pressure.

Example 1:

As shown in Figure 1, a multi-channel plasma area ignition and combustion device mainly includes a nozzle 1, an intake fish mouth 2, a tangential air hole 3, a gas pipe 4, a hollow insulator 5, a high-voltage electrode 6, an insulator 7, and a low-voltage electrode 8. Shell 9, swirl chamber 10, air hole 11, barrier medium 12, low velocity zone 13, center jet 14, flame stabilization chamber 15; the nozzle 1 refers to a direct current nozzle or other nozzles, which are installed in the intake fish mouth pipe A certain position in the wall; the air intake mouth 2 refers to the air intake pipe with splash plate atomization in the middle, which is installed on the inlet end of the shell 9 and the low-voltage electrode 8, and is connected with the inlet seal; the tangential air hole 3 refers to the outlet hole of the intake fish mouth 2, and the outlet hole of the intake fish mouth 2 is provided with one or more blades, the outlet blades make the air flow rotate at a high speed in the swirl chamber, and the height of the outlet blades is the same as the radial distance of the swirl chamber; Said trachea 4 refers to the pipeline that the mixed gas from the intake fish mouth is sent into the high-voltage electrode, and is connected with the hollow insulator 5, or the intake fish mouth is set at the entrance of the hollow insulator 5 separately, and the fuel oil mixture is supplied; The hollow insulator 5 is installed between the high-voltage electrode and the trachea, the downstream of which is the high-voltage electrode, and the upstream is the trachea; the high-voltage electrode 6 refers to a metal round tube or cylinder, which is installed in the center of the igniter. Jet hole, the outer side is connected to the insulating part, on which an insulating barrier medium is placed, or a discharge protrusion is provided, which is connected to the high-voltage line of the plasma power supply; the insulating part 7 is installed between the high-voltage electrode and the low-voltage electrode. Insulating materials such as ceramics between them ensure good discharge between the high-voltage electrode and the low-voltage electrode. The inner side is a high-voltage electrode, and the outer side is a low-voltage electrode to ensure that the high-voltage electrode and the low-voltage electrode are coaxial; the low-voltage electrode 8 refers to a hollow circle There are a certain number of small holes on it to ensure the gas flow in the low-velocity area of the high-voltage electrode and the low-voltage electrode. The inner side is an insulating part, and the outer side is a shell, which is closely connected with the inner insulating part and the outer shell. It is connected with the plasma The low-voltage line of the body power supply is connected; the shell 9 refers to a cylindrical hollow metal part, the inner side is connected to the low-voltage electrode, the outer wall surface is connected to the air intake fish mouth, one end is connected to the insulating medium, and the outlet of the other end is connected to the flame stabilization chamber ; The swirl chamber 10 refers to the swirling air flow channel in the shell, the outer side is the housing, the inner side is the low-voltage electrode, the inlet is an insulator, and the outlet is a flame-stabilizing chamber; the air hole 11 refers to the opening on the low-voltage electrode There are a certain number of mixed gas flow holes to ensure the flow of mixed gas in the low-velocity zone, so that there is always flame burning in the low-velocity zone; the barrier medium 12 refers to the insulating material installed on the outside of the high-voltage electrode to ensure that the high-voltage electrode and the low-voltage electrode The low-velocity region between generates a large volume of low-temperature plasma, thereby achieving large-volume ignition. Or set a certain number of projections 16 (see Figure 2) on the high-voltage electrodes, which have the same size and the same outer diameter, and are located in the low-speed area to ensure that the discharge probability of each projection on the high-voltage electrode to the low-voltage electrode is the same. Ensure multi-point discharge, or use nanosecond pulse power without using dielectric barrier discharge; the low-speed zone 13 refers to the space flow area between the high-voltage electrode and the low-voltage electrode, ensuring reliable ignition under low-speed conditions; the central jet 14 refers to the jet flow at the center of the high-voltage electrode, which ensures the penetration ability of the jet flame of the ignition device; the flame stabilization chamber 15 refers to a predetermined combustion area of a certain shape, which is installed at the exit of the shell to create a recirculation area to ensure the ignition of the flame. Stable, full combustion.

Example 2:

As shown in Figure 2, a multi-channel plasma area ignition and combustion device mainly includes a nozzle 1, an intake fish mouth 2, a tangential air hole 3, a gas pipe 4, a hollow insulator 5, a high-voltage electrode 6, an insulator 7, and a low-voltage electrode 8. Shell 9, swirl chamber 10, air holes 11, protrusions 16, low velocity zone 13, center jet 14, flame stabilization chamber 15; the nozzle 1 refers to a direct current nozzle or other nozzles, which are installed in the intake fish mouth A certain position in the pipe wall; the air intake mouth 2 refers to the air intake pipe with splash plate atomization in the middle, which is installed at the upstream of the shell and is sealed with the shell; the tangential air hole 3 refers to a rectangular The air inlet, whose height is the same as the radial distance of the swirl chamber, is arranged at the upstream of the shell to ensure that the high-speed airflow enters the swirl chamber to generate a high-speed swirling airflow; The mixed gas coming from is sent into the pipeline of the high-voltage electrode, and connected with the high-voltage electrode, and the inlet fish mouth can also be set separately at the inlet of the high-voltage electrode to supply fuel mixed gas; the hollow insulator 5 is installed between the high-voltage electrode and the trachea , the downstream is a high-voltage electrode, and the upstream is a trachea; the high-voltage electrode 6 refers to a metal circular tube or cylinder, an electrode installed in the center of the igniter, with a central jet hole inside, and the outside is connected to an insulating member. Or there is a protrusion 16, or an insulating barrier medium 12 (see Figure 1), which is connected to the high-voltage line of the plasma power supply; the insulator 7 refers to ceramics installed between the high-voltage electrode and the low-voltage electrode, etc. Insulating material to ensure a good discharge between the high-voltage electrode and the low-voltage electrode, the inner side of which is a high-voltage electrode, and the outer side is a low-voltage electrode, ensuring that the high-voltage electrode and the low-voltage electrode are coaxial; the low-voltage electrode 8 refers to a hollow round tube, on which There are a certain number of small holes to ensure the gas flow in the low-velocity area of the high-voltage electrode and the low-voltage electrode. The inner side is the insulating part and the outer side is the shell, which is closely connected with the inner insulating part and the outer shell. It is connected with the low-voltage plasma power supply. Wire connection; the shell 9 refers to a cylindrical hollow metal piece, the inner side is connected with the low-voltage electrode, the outer wall surface is sealed with the intake fish mouth, one end is connected with the insulating medium, and the outlet of the other end is connected with the flame stabilization chamber; The swirling flow chamber 10 refers to the swirling air flow channel in the shell, the outer side of which is the shell, the inner side is the low-voltage electrode, the inlet is an insulator, and the outlet is a flame stabilization chamber; the air hole 11 refers to a certain number of holes on the low-voltage electrode. The mixed gas flow hole ensures the mixed gas flow in the low-velocity zone, so that there is always flame burning in the low-velocity zone; the discharge protrusions 16 refer to the protrusions with a certain number of rows arranged on the high-voltage electrodes, which are the same in size and outside The outer diameters of the ends are the same, and they are located in the low-velocity zone to ensure that the protuberances 16 of the high-voltage electrodes have the same probability of discharging to the low-voltage electrodes, ensuring multi-point discharge, or installing an insulating barrier medium on the outside of the cylindrical high-voltage electrodes to realize regional discharge, or using nanoseconds The pulse power supply may not use dielectric barrier discharge; the low-speed zone 13 refers to the space flow area between the high-voltage electrode and the low-voltage electrode to ensure reliable ignition under low-speed conditions; the central jet 14 refers to the jet at the center of the high-voltage electrode, Guarantee the penetration ability of the jet flame of the ignition device; the stable flame chamber 15 refers to a predetermined combustion area of a certain shape, which is installed at the outlet of the shell to create a recirculation area to ensure the stability of the point flame and complete combustion.

Installation sequence: high-voltage electrode 6 is connected to insulator 7; insulator 7 is connected to low-voltage electrode 8; low-voltage electrode 8 is connected to shell 9; shell 9 is connected to flame stabilization chamber 15; nozzle 1 is connected to intake fish mouth 2; The fish mouth 2 is connected with the low voltage electrode 8 and the shell 9; the intake fish mouth 2 is connected with the air pipe 4; the air pipe 4 is connected with the hollow insulator 5; the hollow insulator 5 is connected with the high voltage electrode; the high voltage electrode 5 is connected with the high voltage line of the power supply; Connect to the low voltage line of the power supply.

The working process of the multi-channel plasma zone ignition combustion device of the present invention is as follows: in the combustion chamber of the engine, the intake air of the intake fish mouth 2 exists all the time, and the fuel is sprayed to the splash plate of the intake fish mouth 2 by the nozzle 1. The fuel mixture enters the swirl chamber 10 through the tangential air hole 3, and the fuel mixture rotates at a high speed in the swirl chamber 10 to improve the atomization, evaporation and blending of the fuel, and the mixed gas swirls out of the swirl chamber 10 and enters the In the flame stabilization chamber 15, due to the low pressure in the ignition device due to the rotating gas mixture, the fuel mixture flows into the low-velocity zone 13 from the air hole 11 of the low-voltage electrode 8, or the gas mixture flows into the low-velocity zone from the outlet of the low-speed zone 13, and then flows from the low-voltage electrode. The gas hole 11 flows out, and another fuel mixture enters the high-voltage electrode 6 through the air pipe 4, and the mixed gas passes through the center jet 14 and passes through the flame stabilization chamber 15; The protrusion 16 discharges to the low-voltage electrode 8 to ignite the combustible gas mixture in the low-velocity zone 13, and the flame in the low-velocity zone 13 ignites the gas mixture in the recirculation zone in the flame stabilization chamber 15, and the flame further ignites the gas mixture in the swirling airflow and the high-speed jet flow , so as to establish a stable high-speed flame. This powerful high-speed jet flame can ignite the fuel mixture in the combustion chamber of the engine, ensuring reliable ignition and flame stability of the engine.

As can be seen from the above description, the present invention realizes plasma in the low-velocity region between the high-voltage electrode and the low-voltage electrode by making full use of the fuel atomization, evaporation, mixing and combustion stabilizing functions of the high-speed rotating airflow, and the penetration ability of the high-speed center jet flame of the high-voltage electrode. Multi-point ignition and regional ignition, the high-temperature combustion thermonuclear area and flame stabilization chamber on duty, play the role of ignition source and flame stabilization, forming a miniature high-speed combustion chamber, the outlet of high-voltage electrodes and low-voltage electrodes is the return area, high-speed jet and rotating Airflow cooling ignition device, the high-speed jet flame provided by the ignition device can ensure reliable ignition and stable combustion of the engine under the conditions of low pressure, low temperature and high speed, and expand the working range of stable combustion. The invention can meet the requirement of high-performance engine ignition through reasonable design. And it can meet the starting and ignition requirements of coal-fired boilers in power stations.

The multi-channel plasma regional ignition and combustion device of the present invention is suitable for the parameter ranges in the engine: the air pressure is 0.03-3.0Mpa, the inlet airflow temperature is 300-1000K, and the speed is 50-200m/s. The fuel flow rate of the ignition device is 0.5-20g/s, the power supply voltage is 1-30kV, the discharge frequency is 5-1000Hz, and the discharge time is 0.3-1000ms to improve the quality of fuel atomization, evaporation and mixing, and the high-speed jet flame provided can ensure the engine at low pressure and low temperature And reliable ignition and stable combustion under high-speed conditions, expanding the stable combustion working range. It can also improve the ignition capacity of coal-fired boilers in power stations.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these specific embodiments are only for illustration, and those skilled in the art can make the above-mentioned Various omissions, substitutions, and changes were made in the details of the methods and systems. For example, it is within the scope of the present invention to combine the above method steps so as to perform substantially the same function in substantially the same way to achieve substantially the same result. Accordingly, the scope of the invention is limited only by the appended claims.

Claims (9)

1. a multichannel heating region ignition burning device, it is characterized in that, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, block media, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall, and fuel oil is directly injected to and spatters on plate; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is the outlet be connected with stable flame chamber; Described spin chamber is the swirling eddy passage in housing, and be housing outside it, inner side is low-field electrode, and one end is connected with dielectric, and one end is communicated with stable flame chamber; Described pore is mixed gas flow orifice low-field electrode having some; Described block media refers to the insulating materials be arranged on outside high-field electrode, ensures that the low regime between high-field electrode and low-field electrode produces the low temperature plasma of large volume; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.

2. a multichannel heating region ignition burning device, it is characterized in that, comprising: plasma electrical source, nozzle, air inlet fish mouth, tangential pore, tracheae, hollow insulator, high-field electrode, insulating part, low-field electrode, shell, spin chamber, pore, thrust, low regime, central jet, stable flame chamber; Described plasma electrical source exports the high voltage low current exchanging and drive, and is lighted the flammable mixed gas of low regime by the electric discharge between high-field electrode and low-field electrode; Described nozzle is arranged on air inlet fish mouth tube wall, and fuel oil is directly injected to and spatters on plate; Described air inlet fish mouth refers to the middle air inlet pipe with spattering plate atomization, is arranged on shell, is connected with body seal, after ensureing that high velocity air enters spin chamber, produces swirling eddy at a high speed; Described tracheae is connected with hollow insulator, and mixed pneumatic transmission is entered the pipeline of high-field electrode, fuel mixes gas, or adopts separately air inlet fish mouth fuel to mix gas; Described hollow insulator is arranged between high-field electrode and tracheae, and its downstream is high-field electrode, and upstream is tracheae; Described high-field electrode is hollow metallic body, is arranged on the electrode of igniter center, and inside has central jet hole, and outside is connected with insulating part, and it is connected with the high-voltage line of plasma electrical source; Described insulating part is arranged between high-field electrode and low-field electrode, is high-field electrode inside it, and outside is low-field electrode, high-field electrode and low-field electrode coaxial; Described low-field electrode is the pipe of hollow, it has the pore of some, ensures the gas flowing of the low regime of high-field electrode and low-field electrode, it is insulating part inside it, outside is housing, and with inner side insulating part and outside housing compact siro spinning technology, it is connected with the low-voltage line of plasma electrical source; Described shell is cylindrical hollow metalwork, and inner side is connected with low-field electrode, and outer side surface and air inlet fish mouth are tightly connected, and one end is the outlet be connected with stable flame chamber; Described spin chamber is the swirling eddy passage in housing, and be housing outside it, inner side is low-field electrode, and one end is connected with dielectric, and one end is communicated with stable flame chamber; Described pore is mixed gas flow orifice low-field electrode having some; High-field electrode is arranged the protrusion of certain number of permutations, its size is identical, and outer end external diameter is identical, ensures that the probability that each protrusion of high-field electrode discharges to low-field electrode is identical; Described low regime is the spatial flow region between high-field electrode and low-field electrode, reliable ignition under guarantee low-speed conditions; Described central jet is the jet at high-field electrode center, ensures the penetration capacity of igniter jet flame; Described stable flame chamber is the flameholding region of definite shape, and it is arranged on shell one end exit.

3. multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described air inlet fish mouth is arranged on the entrance point of shell and low-field electrode, is connected with inlet seal; Described tangential pore is air inlet fish mouth venthole, and air inlet fish mouth outlet opening is provided with one or more blade, and exit vane makes air-flow High Rotation Speed in spin chamber, and exit vane width is identical with spin chamber's radial spacing.

4. multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described air inlet fish mouth is arranged on shell one end relative with stable flame chamber, is connected with body seal; Described tangential pore is air admission hole, and its height is identical with spin chamber's radial distance.

5. multichannel heating region according to claim 4 ignition burning device, is characterized in that: described protrusion gap 2-10mm.

6. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described insulating part is refractory ceramics.

7. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: high-field electrode is pipe or cylinder.

8. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: described tracheae one end is connected with air inlet fish mouth, or tracheae adopts independent air inlet fish mouth fuel to mix gas.

9. any one multichannel heating region according to claim 1 and 2 ignition burning device, is characterized in that: the voltage of described plasma electrical source, electric current and a-c cycle are respectively: 1-10kV, 0.1-10A and 10-500kHz.